KR101765319B1 - Hybrid converter and control method thereof - Google Patents

Hybrid converter and control method thereof Download PDF

Info

Publication number
KR101765319B1
KR101765319B1 KR1020150145525A KR20150145525A KR101765319B1 KR 101765319 B1 KR101765319 B1 KR 101765319B1 KR 1020150145525 A KR1020150145525 A KR 1020150145525A KR 20150145525 A KR20150145525 A KR 20150145525A KR 101765319 B1 KR101765319 B1 KR 101765319B1
Authority
KR
South Korea
Prior art keywords
switch
transformer
bridge converter
leg
converter
Prior art date
Application number
KR1020150145525A
Other languages
Korean (ko)
Other versions
KR20160140308A (en
Inventor
최우진
반 롱 트란
송형석
Original Assignee
숭실대학교산학협력단
영화테크(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 숭실대학교산학협력단, 영화테크(주) filed Critical 숭실대학교산학협력단
Publication of KR20160140308A publication Critical patent/KR20160140308A/en
Application granted granted Critical
Publication of KR101765319B1 publication Critical patent/KR101765319B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02J7/022—
    • H02M2001/0058—

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A full bridge circuit including first and second legs supplied with input power and provided with first to fourth switches, a first transformer for converting an input voltage transmitted through the full bridge circuit, And a delay switch provided between the plurality of diodes and the circulating diode and the output inductor. The switching regulator includes a plurality of diodes for receiving and rectifying the input voltage converted through the plurality of diodes, a circulating diode and an output inductor for performing freewheeling, Bridge converter; And a half bridge circuit sharing the second leg with the soft switching full bridge converter, a second transformer converting an input voltage transmitted through the half bridge circuit, and a second transformer receiving the input voltage converted through the second transformer A hybrid converter including a resonant half bridge converter including a plurality of rectifying diodes is disclosed.

Figure R1020150145525

Description

HYBRID CONVERTER AND CONTROL METHOD THEREOF BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a hybrid converter and a driving method thereof, and more particularly, to a hybrid converter including a soft switching full bridge converter and a resonant half bridge converter, and a driving method thereof.

As interest in fossil fuel depletion and environmental issues grows, rechargeable hybrid cars or electric vehicles are becoming popular all over the world. As a result, researches on rechargeable hybrid vehicles or electric vehicles have been actively conducted in domestic and overseas automobile manufacturers. In addition, there has been a lot of interest and research related to chargers for charging battery packs, which are core parts of hybrid vehicles or electric vehicles It is concentrated.

Up to now, a vehicle-mounted charger with a capacity of 3.3 kW has been the most widely used, and it takes 4 to 6 hours to charge a lithium battery in a PHEV (Plug-in Hybrid Electric Vehicle).

On the other hand, as the battery is required to be charged at a high speed, a charger having an increased capacity has been continuously developed. As a result, a charger having a capacity of 6.6 kW has been introduced, and the capacity of the charger is expected to increase to 10 kW in the future. Here, in order to realize a charger with an increased capacity, a DC-DC converter with high output / high efficiency is essential.

As such a high-output / high-efficiency DC-DC converter, there is, for example, a phase-shift full bridge converter (PSFB). The phase shift type full bridge converter (PSFB) can achieve high efficiency by enabling soft switching when the switching elements included in the primary side circuit are turned on. However, the full-bridge converter (PSFB) of the phase shift type has a limited turn-on range due to the soft switching of the switching elements, and may be caused by the circulating current generated in the primary circuit due to the reflux of the secondary circuit. There is a problem that soft switching can not be performed when the devices are turned off.

Another type of high-power / high-efficiency DC-DC converter is a resonant converter. When the resonant converter operates at the resonant frequency, loss of the switching elements does not occur and soft switching is possible, so that high efficiency can be achieved. However, if a change in input / output voltage is required, the switching frequency must be changed. In such a case, the efficiency is reduced as soft switching becomes impossible.

Also, a hybrid converter combining a full-bridge converter (PSFB) of the above-described phase shift type and a resonant converter has been proposed. Such a converter achieves soft switching of the switching elements over a wide range, but there is still a loss due to the circulating current generated in the primary circuit due to the reflux of the secondary circuit.

Accordingly, it is necessary to develop a new converter capable of overcoming the disadvantages of the above-described converters and achieving high output / high efficiency.

One aspect of the present invention relates to a hybrid converter and a driving method thereof, including a soft switching full bridge converter in which a switch and a diode for free wheeling are added to a secondary circuit of a full-bridge converter of a phase shift type, To provide a hybrid converter capable of combining the half bridge converters to ensure soft switching in the entire load range, to eliminate the circulating current, and to output a high output voltage by connecting the outputs of the two converters in series, and a driving method thereof do.

According to one aspect of the present invention, there is provided a hybrid converter including a full bridge circuit including a first leg and a second leg that are supplied with input power and provided with first to fourth switches, A plurality of diodes for receiving and rectifying the input voltage converted through the first transformer, a circulating diode for performing freewheeling and an output inductor, a plurality of diodes, a plurality of diodes, A soft switching full bridge converter including a delay switch provided between the first and second switches; And a half bridge circuit sharing the second leg with the soft switching full bridge converter, a second transformer converting an input voltage transmitted through the half bridge circuit, and a second transformer receiving the input voltage converted through the second transformer And a resonant half-bridge converter including a plurality of rectifying diodes.

Meanwhile, the soft switching full bridge converter includes a first output capacitor connected to the output inductor and the circulating diode, and the resonant half bridge converter includes a second output capacitor connected to the plurality of diodes , The first output capacitor and the second output capacitor may be connected in series.

Also, the soft switching full bridge converter may include a first leg and a second leg connected in parallel, wherein the first switch and the second switch are provided on the first leg, and the third switch and the second switch are provided on the second leg, Wherein the first switch and the second switch operate symmetrically with a predetermined dead time and the third switch and the fourth switch have a predetermined dead time and are symmetrical . ≪ / RTI >

The resonant half bridge converter may further include a second input voltage line connected to the second leg, and a resonance capacitor may be provided on the second input voltage line.

The first switch to the fourth switch may be connected in parallel with a parasitic capacitor and a body diode, respectively.

In addition, the third switch and the fourth switch can perform a switching operation according to a fixed frequency.

The delay switch may be turned on when both the first switch and the fourth switch are in a turned-on state or both the second switch and the third switch are in a turned-on state.

Also, the delay switch may be added by connecting a parasitic capacitor and a body diode in parallel.

Further, the first switch to the fourth switch may be turned on by the zero voltage switching, and may be turned off by the zero current switching.

According to another aspect of the present invention, there is provided a full bridge circuit comprising: a full bridge circuit including a first leg and a second leg that are supplied with input power and provided with first to fourth switches; A first transformer, a plurality of diodes for receiving and rectifying the input voltage converted through the first transformer, a circulating diode and an output inductor for performing freewheeling, a plurality of diodes arranged between the plurality of diodes and the circulating diode, and an output inductor A soft switching full bridge converter comprising a delayed switch, a circulating diode and a first output capacitor coupled to the output inductor; And a half bridge circuit sharing the second leg with the soft switching full bridge converter, a second transformer converting an input voltage transmitted through the half bridge circuit, and a second transformer receiving the input voltage converted through the second transformer A method of driving a hybrid converter including a resonant half bridge converter including a plurality of rectifying diodes and a second output capacitor connected to the plurality of diodes, the soft switching full bridge converter comprising: Wherein the first transformer is connected to the first transformer and the second transformer is connected to the first transformer and the second transformer is connected to the second transformer, To the first output capacitor through the delay switch, Wherein the resonance type half bridge converter supplies the power stored in the output inductor to the first output capacitor by forming a closed circuit of the first switch, the odd switch, the output inductor and the first output capacitor, And supplies the input voltage to the second output capacitor through the second transformer in accordance with the switching operation.

Meanwhile, operating the first transformer by transmitting the input voltage to the first transformer in accordance with the switching operation of the first switch to the fourth switch may include switching the first switch and the second switch provided on the upper side of the first leg, When both of the fourth switches provided on the lower side of the second leg are in a turned-on state or both of the second switch provided on the lower side of the first leg and the third switch provided on the upper side of the second leg are turned on, And to transfer the voltage to the first transformer to operate the first transformer.

In addition, the third switch and the fourth switch can perform a switching operation according to a fixed frequency.

In addition, the soft switching full bridge converter can control the first output voltage output from the first output capacitor by changing the effective duty.

Further, the first switch to the fourth switch may be turned on by the zero voltage switching, and may be turned off by the zero current switching.

According to an aspect of the present invention, a circulating current generated in a primary circuit in a freewheeling period is removed by a soft switching full bridge converter including a switch and a diode for freewheeling in a secondary circuit, The bridge converter achieves soft switching of the switching elements in the full load range and the output of the soft switching full bridge converter and the resonant half bridge converter can be connected in series to achieve higher voltage gain, And can be applied to a large capacity charger.

1 is a schematic circuit diagram of a hybrid converter according to an embodiment of the present invention.
2 is a graph of a current flowing in a device of the hybrid converter or a voltage applied to the device according to an embodiment of the present invention.
3 to 7 are schematic circuit diagrams for explaining an operation mode of the hybrid converter according to an embodiment of the present invention.
8 is a graph showing a relationship between an output voltage of a resonant half bridge converter included in a hybrid converter according to an embodiment of the present invention and a transformer turn ratio.
9 is a graph for explaining a battery charging method using a hybrid converter according to an embodiment of the present invention and conditions for satisfying a zero voltage switching condition.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic circuit diagram of a hybrid converter according to an embodiment of the present invention.

1, a hybrid converter according to an embodiment of the present invention performs voltage conversion between an input capacitor 200 and a battery 300 and includes a soft switching full bridge converter 110 and a resonant half bridge converter 120).

The hybrid converter according to one embodiment of the present invention is, for example, a DC-DC converter included in an in-vehicle type charger that converts an input voltage of 380 V to 400 V to an output voltage of 200 V to 420 V to charge the battery 300 .

At this time, the input capacitor 200 is an output terminal of the AC-DC converter included in the in-vehicle type charger, and the commercial AC voltage of 120V to 240V converted into the DC voltage of 380V to 400V is supplied to the hybrid converter .

In other words, the hybrid converter according to the embodiment of the present invention can perform the voltage conversion between the input capacitor 200 and the battery 300 to charge the battery 300. At this time, according to the embodiment of the present invention, The soft switching full bridge converter 110 included in the hybrid converter is a converter in which a delay switch S5 and a circulation diode D9 for freewheeling are added to a secondary circuit of a full bridge converter of a phase shift type, The circulation current generated in the primary side circuit can be removed.

Therefore, the hybrid converter according to the embodiment of the present invention combines the above-described soft switching full bridge converter 110 and the resonant half bridge converter 120 to remove the circulating current by the soft switching full bridge converter 110 And the soft switching of the switching elements can be achieved by the resonant half bridge converter 120. [

In addition, the hybrid converter according to an embodiment of the present invention can achieve a higher voltage gain by serially connecting the output of the soft switching full bridge converter 110 and the output of the resonant half bridge converter 120. In this case, since the output voltage of the hybrid converter according to the embodiment of the present invention can be controlled by changing the effective duty of the soft switching full bridge converter 110, when operating according to the resonance frequency, the resonant half bridge converter 120 ) Can achieve soft switching of the switching elements in the full load period.

Hereinafter, the soft switching full bridge converter 110 and the resonant half bridge converter 120 included in the hybrid converter according to an embodiment of the present invention will be described in detail.

The soft switching full bridge converter 110 is an isolated type converter in which a primary side circuit and a secondary side circuit are electrically insulated from each other around a first transformer 119. A primary side circuit includes a first switch S1 to a fourth switch And the secondary side circuit may include a rectifying circuit provided with the first to fourth diodes D1 to D4, a delay switch S5, a circulating diode D9, an output inductor 117 and a first output capacitor 118.

Specifically, the full bridge circuit included in the primary circuit of the soft switching full bridge converter 110 includes a first leg 110-1, a second leg 110-2 and a first leg 110- And a first input voltage line 110-5 connecting the first and second legs 110-1 and 110-2. At this time, the high side contact c of the first leg 110-1 and the second leg 110-2 and the lower side of the first leg 110-1 and the second leg 110-2 and the low side contact d may be connected to both ends of the input capacitor 200, respectively.

A first switch S1 is provided on the high side of the first leg 110-1 and a second switch S2 is provided on the low side of the first leg 110-1. A third switch S3 is provided on the high side of the second leg 110-2 and a fourth switch S4 is provided on the low side of the second leg 110-2. May be provided.

The first input voltage line 110-5 is connected between the first node a between the first switch S1 and the second switch S2 and the second node a between the third switch S3 and the fourth switch S4. A first leakage inductor 113 and a primary winding 119-1 of the first transformer 119 may be provided on the first input voltage line 110-5.

Here, as the first switch S1 to the fourth switch S4, a BJT, a JFET, a MOSFET, a MOS transistor, or the like can be used, and a MOS transistor is mainly used. Therefore, in the following description, it is assumed that the first switch S1 to the fourth switch S4 are MOS transistors.

In addition, a body diode and a parasitic capacitor may be connected in parallel to the first switch S1 to the fourth switch S4, respectively. For example, the drain terminal of the first switch S1 is connected in parallel with the cathode of the body diode and one end of the parasitic capacitor, and the source terminal of the first switch S1 is connected in parallel with the anode of the body diode and the other end of the parasitic capacitor . In this way, the second switch S2 to the fourth switch S4 can also be added in parallel with the body diode and the parasitic capacitor.

In the first leg 110-1, the drain terminal of the first switch S1 is connected to the first leg S1 through the first leg S1, 110-1 and the high side contact c of the second leg 110-2 and the source terminal of the first switch S1 may be connected to the drain terminal of the second switch S2 The source terminal of the second switch S2 may be connected to the low side contact d of the first leg 110-1 and the second leg 110-2. In the second leg 110-2, the drain terminal of the third switch S3 is connected to the high side contact c of the first leg 110-1 and the second leg 110-2 The source terminal of the third switch S3 may be connected to the drain terminal of the fourth switch S4 and the source terminal of the fourth switch S4 may be connected to the first leg 110-1 and the second leg 110- Side contact d of the first and second electrodes.

The primary side circuit of the soft switching full bridge converter 110 includes the first switch S1 to the fourth switch S4 connected to the input capacitor 200 so that the first switch S1 to fourth The input voltage V s supplied from the input capacitor 200 may be transmitted to the secondary circuit through the first transformer 119 according to the switching operation of the switch S4.

On the other hand, the rectifying circuit included in the secondary circuit of the soft switching full bridge converter 110 includes a third leg 110-3, a fourth leg 110-4, a third leg 110-3, And a first output voltage line 110-6 connecting the fourth leg 110-4. At this time, the high side contact g of the third leg 110-3 and the fourth leg 110-4 is connected to the delay switch S5, and the third leg 110-3 and the fourth leg The low side contact h of the leg 110-4 may be connected to the circulating diode D9.

A first diode D1 is provided on the high side of the third leg 110-3 and a third diode D3 is provided on the low side of the third leg 110-3. A second diode D2 is provided on the high side of the fourth leg 110-4 and a fourth diode D4 is provided on the low side of the fourth leg 110-4. May be provided.

In the third leg 110-3, the cathode of the first diode D1 is connected to the third leg 110-3, and the third diode 110-3 is connected to the second diode D1-3. And the anode of the first diode D1 may be connected to the cathode of the third diode D3 and the third diode D3 may be connected to the high side contact g of the fourth leg 110-4, D3 may be connected to the low side contact h of the third leg 110-3 and the fourth leg 110-4. In the fourth leg 110-4, the cathode of the second diode D2 is connected to the high side contact g of the third leg 110-3 and the fourth leg 110-4, The anode of the second diode D2 may be connected to the cathode of the fourth diode D4 and the anode of the fourth diode D4 may be connected to the lower side of the third leg 110-3 and the fourth leg 110-4 can be connected to a low side contact (h).

The first output voltage line 110-6 is connected between the third node e between the first diode D1 and the third diode D3 and the third node e between the second diode D2 and the fourth diode D4. Fourth node f may be connected and a secondary winding 119-2 of the first transformer 119 may be provided on the first output voltage line 110-6.

Here, the secondary winding (119-2) of the first transformer 119 primary winding (119-1) to a predetermined transformer turns ratio of the first transformer (119) having a (n 1 1) is magnetically coupled with the 1 transformer 119 and can receive energy from the primary winding 119-1 of the first transformer 119. [ That is, the first secondary winding (119-2) of the transformer (119) has a first transformer turns ratio from the primary winding (119-1) of the first transformer (119): according to the (n 1 1) convert the input voltage (V s ).

The delay switch S5 included in the secondary circuit of the soft switching full bridge converter 110 has one end connected to the high side contact of the third leg 110-3 and the fourth leg 110-4 g. < / RTI >

As the delay switch S5, a BJT, a JFET, a MOSFET, a MOS transistor, or the like can be used, and a MOS transistor is mainly used. Therefore, in the following description, it is assumed that the delay switch S5 is provided by a MOS transistor. The delay switch S5 may be connected in parallel with the body diode and the parasitic capacitor in the same manner as the first switch S1 to the fourth switch S4.

In other words, the drain terminal of the delay switch S5 can be connected to the high side contact g of the third leg 110-3 and the fourth leg 110-4, and the drain terminal of the delay switch S5 The source terminal may be connected to the circulating diode D9 and the output inductor 117 connected in parallel.

The cathode of the circulating diode D9 included in the secondary circuit of the soft switching full bridge converter 110 is connected to the source terminal of the delay switch S5 and one end of the output inductor 117, The anode of the first leg 110-3 may be connected to the low side contact h of the third leg 110-3 and the fourth leg 110-4 and the first output capacitor 118. At this time, the other end of the output inductor 117 may be connected to the first output capacitor 118. That is, both ends of the first output capacitor 118 may be connected to the output inductor 117 and the circulating diode D9, respectively, and may transfer the first output voltage V o1 to the battery 300.

Thus, the secondary circuit of the soft switching full bridge converter 110 receives the converted input voltage V s according to the turn ratio (1: n 1 ) of the first transformer 119 from the primary circuit, The battery 300 can be charged by being rectified by the diodes D1 to D4 and then transmitted to the first output capacitor 118. [ At this time, the circulating current generated in the primary circuit in the freewheeling period by the delay switch S5 and the circulating diode D9 included in the secondary circuit of the soft switching full bridge converter 110 is Can be removed. That is, the circulating diode D9 can prevent the current emitted from the output inductor 117 from flowing to the rectifying circuits of the first diode D1 to the fourth diode D4.

The resonant half bridge converter 120 is an isolated type converter in which the primary circuit and the secondary circuit are electrically insulated from each other around the second transformer 129. The primary circuit includes the soft switching full bridge converter 110 Bridge circuit sharing the second leg 110-2 included in the primary side circuit of the rectifier circuit 110. The secondary side circuit may include a rectifying circuit provided with the fifth diode D5 to the eighth diode D8, And a second output capacitor 128.

Specifically, the primary circuit of the resonant half bridge converter 120 is the second leg 110-2 included in the primary circuit of the soft switching full bridge converter 110, and the second leg 110-2, And a second input voltage line 120-5 connected to the second input voltage line 120-1. That is, the primary circuit of the resonant half bridge converter 120 may share the third switch S3 and the fourth switch S4 included in the soft switching full bridge converter 110.

The second leakage inductor 123 and the second transformer 129 are connected to the second input voltage line 120-5 connected to the second node b between the third switch S3 and the fourth switch S4. The primary winding 129-1 of the transformer may be provided.

The primary circuit of the resonant half bridge converter 120 further includes a resonant capacitor 124 provided between the primary winding 129-1 and the fourth switch S4 of the second transformer 129 . That is, the resonant capacitor 124 may be provided between the primary winding 129-1 of the second transformer 129 and the source terminal of the fourth switch S4.

Thus, the primary circuit of the resonant half bridge converter 120 shares the soft switching full bridge converter 110 with the third switch S3 and the fourth switch S4, 4 switch S4 is operated by the resonance current generated in the primary circuit and the input voltage V s supplied from the input capacitor 200 can be transmitted to the secondary circuit through the second transformer 129. [

The rectifier circuit included in the secondary circuit of the resonant half bridge converter 120 includes the fifth leg 120-1, the sixth leg 120-2, the fifth leg 120-1, And a second output voltage line 120-6 connecting the sixth leg 120-2.

A fifth diode D5 is provided on the high side of the fifth leg 120-1 and a seventh diode D7 is provided on the low side of the fifth leg 120-1 A sixth diode D6 is provided on the high side of the sixth leg 120-2 and an eighth diode D8 is provided on the low side of the sixth leg 120-2. May be provided.

In the fifth leg 120-1, the cathode of the fifth diode D5 is connected to the fifth leg 120-1, and the cathode of the fifth diode D5 is connected to the fifth leg 120-1. And the anode of the fifth diode D5 may be connected to the cathode of the seventh diode D7 and the anode of the seventh diode D7 may be connected to the high side contact k of the sixth leg 120-2, D7 may be connected to the low side contact 1 of the fifth leg 120-1 and the sixth leg 120-2. In the sixth leg 120-2, the cathode of the sixth diode D6 is connected to the high side contact k of the fifth leg 120-1 and the sixth leg 120-2, The anode of the sixth diode D6 may be connected to the cathode of the eighth diode D8 and the anode of the eighth diode D8 may be connected to the lower side of the fifth leg 120-1 and the sixth leg 120-2 can be connected to a low side contact (l).

The second output voltage line 120-6 is connected between the fifth node i and the sixth diode D6 and the eighth diode D8 between the fifth diode D5 and the seventh diode D7. The secondary winding 129-2 of the second transformer 129 may be provided on the second output voltage line 120-6.

Here, the second secondary winding (129-2) of the transformer 129 primary winding (129-1) to a predetermined transformer turns ratio of the second transformer (129) having a (1, n 2) are magnetically coupled with the 2 transformer 129 and receive energy from the primary winding 129-1 of the second transformer 129. [ That is, the second secondary winding (129-2) of the transformer (129) has a second transformer turns ratio from the primary winding (129-1) of the second transformer (129): the conversion in accordance with (1 n 2), the input voltage (V s ).

One end of the second output capacitor 128 included in the secondary circuit of the resonant half bridge converter 120 is connected to the high side of the fifth leg 120-1 and the sixth leg 120-2, And the other end of the second output capacitor 128 may be connected to the low side contact 1 of the fifth leg 120-1 and the sixth leg 120-2, And may transmit the second output voltage V o2 to the battery 300.

Here, the second output capacitor 128 may be connected in series with the first output capacitor 118 included in the secondary circuit of the soft switching full bridge converter 110 described above. That is, the battery 300 may be supplied with a first output voltage V o1 discharged from the first output capacitor 118 and a second output voltage V o2 discharged from the second output capacitor 128 .

As described above, the secondary circuit of the resonant half bridge converter 120 receives the input voltage V s converted according to the turn ratio (1: n 2 ) of the second transformer 129 from the primary circuit, The battery 300 can be charged by being rectified by the diodes D5 to D8 and transmitting it to the second output capacitor 128. [

In the driving method of the hybrid converter according to the embodiment of the present invention, the soft switching full bridge converter 110 performs the switching operation of the first switch S1 to the fourth switch S4 provided in the primary circuit When the delay switch S5 provided in the secondary side circuit is turned on, the input voltage V dc is supplied to the first transformer 119 through the first transformer 119, Energy is transferred from the secondary side circuit to the first output capacitor 118 and when the delay switch S5 is in the turned off state, free wheeling by the circulating diode D9 and the output inductor 117 provided in the secondary side circuit is performed .

The resonant half-bridge converter 120 is connected to the third switch S3 and the fourth switch S4, which are shared with the soft switching full bridge converter 110, in accordance with the optimal value of the LLC resonance of the primary circuit, To transfer the input voltage V dc to the second transformer 129 and to operate it and to transfer the energy continuously from the primary circuit to the second output capacitor 128 through the second transformer 129 .

Here, since the first output capacitor 118 and the second output capacitor 128 can be connected in series to supply energy to the battery 300, the hybrid converter according to the embodiment of the present invention can achieve high voltage gain And the rectifier circuit including a plurality of diodes in the first output capacitor 118 and the second output capacitor 128 are connected in parallel so that the voltage stress of the plurality of diodes can be reduced.

Also, since the resonant half bridge converter 120 operates with a fixed duty according to the optimum value of the LLC resonance, the second output voltage V o2 , which is the output voltage of the resonant half bridge converter 120, is fixed, Accordingly, the total output voltage can be controlled by controlling the first output voltage V o1 , which is the output voltage, by varying the effective duty of the soft switching full bridge converter 110.

In particular, since the hybrid converter according to the embodiment of the present invention does not generate a circulating current by the soft switching full bridge converter 110 as described above and the resonant half bridge converter 120 operates at a fixed frequency, It is possible to minimize the damage of the elements by satisfying the soft switching condition of the switching elements included in the primary circuit in the entire load period. That is, the first to fourth switches S1 to S4 may be turned on by Zero Voltage Switching (ZVS) and may be turned off by Zero Current Switching (ZCS). Particularly, at a light load, it is possible to have higher efficiency than a hybrid converter in which a conventional phase shift type full bridge converter and a resonant half bridge converter are combined.

Hereinafter, a specific driving method of the hybrid converter according to an embodiment of the present invention will be described with reference to FIG. 2 to FIG.

FIG. 2 is a graph illustrating currents flowing through the respective devices or voltages applied to the devices according to the operation of the hybrid converter according to an embodiment of the present invention.

Referring to FIG. 2, the first switch S1 and the second switch S2 provided in the first leg 110-1 operate symmetrically with a predetermined dead time, The third switch S3 and the fourth switch S4 provided in the leg 110-2 may also operate symmetrically with a predetermined dead time.

The third switch S3 and the fourth switch S4 shared by the soft switching full bridge converter 110 and the resonant half bridge converter 120 are connected in parallel to the resonant half bridge converter 120, It can operate according to frequency.

The delay switch S5 is connected between the first switch S1 and the fourth switch S4 or the second switch S2 and the third switch S2 provided on the diagonal line of the primary circuit of the soft switching full bridge converter 110 S3 are all turned on, energy can be transferred from the primary circuit to the secondary circuit through the first transformer 119. [

In other words, the delay switch S5 can be turned on at the same time when the third switch S3 or the fourth switch S4 is turned on, and the first switch S1 or the second switch S2 is turned off Can be turned off at the same time.

The half period of the switching period of the first switch S1 to the fourth switch S4 and the delay switch S5 is divided into five periods and the operation of the hybrid converter according to the embodiment of the present invention Mode.

3 is a schematic circuit diagram for explaining a first operation mode of the hybrid converter according to an embodiment of the present invention.

3, in the first operation mode [t 0 to t 1 ], all the switches except the first switch S 1 are turned off in the primary circuit of the soft switching full bridge converter 110, The transformer 119 does not operate and the first transformer 119 does not operate because the first switch S1 does not operate even if the first transformer 119 is turned on according to a predetermined switching period. ) Are shown by dotted lines.

Further, in the secondary circuit of the soft switching full bridge converter 110, free wheeling by the circulating diode D9 and the output inductor 117 can be started. Here, in the secondary circuit of the soft switching full bridge converter 110, since the delay switch S5 is in the turned off state, no circulating current is generated in the primary circuit, and accordingly, the first switch S1 The loss of the fourth switch S4 can be prevented.

On the other hand, the third switch (S3) at t 0 may be turned off by the zero-current-switching (ZCS). That is, since the current I DS3 flowing from t 0 to the third switch S 3 becomes equal to the magnetizing current I Lm 2 flowing through the primary side circuit of the resonant half bridge converter 120, the third switch S 3 Can be turned off by zero current switching (ZCS).

At this time, the magnetizing current I Lm2 flowing through the primary circuit of the resonant half bridge converter 120 can discharge the parasitic capacitors connected in parallel to the third switch S3, and the fourth switch S4 can discharge zero voltage The parasitic capacitors connected in parallel to the fourth switch S4 may be charged until the body diode connected in parallel to the fourth switch S4 is turned on so as to satisfy the switching (ZVS) condition.

4 is a schematic circuit diagram for explaining a second operation mode of the hybrid converter according to an embodiment of the present invention.

4, in the second operation mode [t 1 to t 2 ], the first switch S 1 and the fourth switch S 4 provided on the diagonal line in the primary circuit of the soft switching full bridge converter 110 The first transformer 119 can be operated and the delay switch S5 is turned on in the secondary circuit so that the current I pri1 of the primary circuit is transferred to the secondary circuit by the first transformer 119 And can be reflected to the output inductor 117.

That is, the fourth switch (S4) at t 1 is turned on by the zero voltage switching (ZVS), the delay switch (S5) may also be turned on at the same time. Therefore, the input voltage V dc is transferred to the first transformer 119 through the first switch S1 and the fourth switch S4 so that the current I pri1 of the primary side circuit changes from t 1 to t 2 And can be transferred from the t 2 to the secondary circuit by the first transformer 119, which can be reflected in the output inductor 117.

On the other hand, in the secondary circuit of the soft switching full bridge converter 110, since the circulating diode D9 is still conducting, a loss may occur in the delay switch S5.

At this time, the resonant half bridge converter 120 can transfer energy from the primary side circuit to the secondary side circuit through the second transformer 129 according to the turn-on of the fourth switch S4.

5 is a schematic circuit diagram for explaining a third mode of operation of the hybrid converter according to the embodiment of the present invention.

5, the third operation mode, the [t 2 ~ t 3], can transfer energy to the secondary circuit from the primary circuit both soft-switching full-bridge converter 110 and a resonant half-bridge converter 120 .

At this time, an increase amount of the current I Pri1 flowing in the primary side circuit of the soft switching full bridge converter 110 in the third operation mode can be obtained by using the following equation (1).

Figure 112015101083339-pat00001

In Equation 1, n 1 denotes the turn ratio of the first transformer 119, V dc denotes the input voltage, V o1 denotes the output voltage of the soft switching full bridge converter 110, L o denotes the inductance of the output inductor 117 .

When the capacitance C o1 of the first output capacitor 118 and the capacitance C o2 of the second output capacitor 128 are designed to be sufficiently large values, The current I Pri2 flowing in the primary circuit of the second transformer 129 may increase in accordance with the resonant frequency of the second leakage inductor 123 and the resonant capacitor 124. [

6 is a schematic circuit diagram for explaining a fourth operation mode of the hybrid converter according to the embodiment of the present invention.

In the fourth operation mode [t 3 to t 4 ], the first switch S 1 and the delay switch S 5 can be turned off at t 3 .

At this time, in the secondary circuit of the soft switching full bridge converter 110, the parasitic capacitor added to the delay switch S5 can be quickly discharged and the circulating diode D9 can be turned on. Therefore, in the secondary circuit of the soft switching full bridge converter 110, a path for freewheeling can be formed in addition to the rectification circuit by the first diode (D1) to the fourth diode (D4).

Further, in the primary circuit of a soft-switching full-bridge converter (110), the second switch (S2) across the voltage sudden drop across the second switch (S2) is by a zero-voltage switching (ZVS) at t 4 Can be turned on.

Here, the resonant half bridge converter 120 can continuously transmit energy from the primary side circuit to the secondary side circuit.

7 is a schematic circuit diagram for explaining a fifth operation mode of the hybrid converter according to the embodiment of the present invention.

7, in the fifth operation mode [t 4 to t 5 ], in the primary circuit of the soft switching full bridge converter 110, all switches except the second switch S 2 and the fourth switch S 4, Since the first transformer 119 does not operate because the first transformer 119 does not operate even when the second switch S2 is turned on according to a predetermined switching period because the first transformer 119 is turned off, 7, the second switch S2 is shown by a dotted line.

Further, in the secondary circuit of the soft switching full bridge converter 110, free wheeling by the circulating diode D9 and the output inductor 117 can be started.

That is, in the secondary circuit of the soft switching full bridge converter 110, the output current can be transferred to the battery 300 by freewheeling, and since the delay switch S5 is in the turned off state, the circulating current in the primary circuit Can be removed.

On the other hand, the fourth switch (S4) in 5 t is zero current switching: can be turned off by the (ZCS Zero Current Switching). That is, since the current I DS4 flowing from t 5 to the fourth switch S4 becomes equal to the magnetizing current I Lm2 flowing through the primary side circuit of the resonant half bridge converter 120, the fourth switch S4 It can be turned off while satisfying the ZCS (Zero Current Switching) condition. That is, the fourth switch S4 can be turned off by the zero current switching (ZCS) regardless of the load condition.

Thereafter, the first switch S1 and the second switch S2 operate inversely according to the first to fifth operation modes during the half period, and the third switch S3 and the fourth switch S4 And can transmit the voltage V dc supplied from the input capacitor 200 to the battery 300 in an opposite operation.

Hereinafter, a design consideration of the hybrid converter according to an embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG.

8 is a graph showing a relationship between an output voltage of a resonant half bridge converter included in a hybrid converter according to an embodiment of the present invention and a transformer turn ratio.

The hybrid converter according to an embodiment of the present invention is a converter in which a soft switching full bridge converter 110 and a resonant half bridge converter 120 are combined and is connected to the battery 300 by the output of the resonant half bridge converter 120, And the output voltage of the battery 300 can be controlled by the soft switching full bridge converter 110. In this case,

Therefore, in order to maximize the efficiency of the hybrid converter according to the embodiment of the present invention, the turn ratio n 2 of the second transformer 129 is set so that the resonant half bridge converter 120 can output the maximum voltage , But it is preferable to set it considering the turn ratio (n 1 ) of the first transformer 119 included in the soft switching full bridge converter 110.

That is, the first output voltage V o1 by the soft switching full bridge converter 110 can be obtained using the following equation (2).

Figure 112015101083339-pat00002

In Equation 2, n 1 is the turns ratio of the first transformer (119), D is the first leg 110-1 and the second leg (110-2 included in the primary circuit of a soft-switching full-bridge converter (110) ), And V s means the input voltage.

Also, the second output voltage V o2 by the resonant half bridge converter 120 can be obtained using the following equation (3).

Figure 112015101083339-pat00003

In Equation 3, V s denotes an input voltage, and n 2 denotes a turn ratio of the second transformer 129.

Also, using Equations (2) and (3), the second transformer 129 turn ratio n 2 included in the resonant half bridge converter 120 for achieving the maximum efficiency of the hybrid converter according to an embodiment of the present invention, Can be obtained by using the following expression (4).

Figure 112015101083339-pat00004

In Equation 4, V 0 max and V 0 min are the maximum and minimum values of the output voltage, V o1 is the output voltage of the soft switching full bridge converter 110, D max and D min are the soft switching full bridge converters 110 ) contained in the primary side circuit of the first leg 110-1 and the second leg 110-2 effective duty maximum and minimum values of between, V s max, V s min is the input voltage maximum value and the minimum value of the .

8, the output voltage of the resonant half-bridge converter 120 is preferably approximately 130 V, and the ratio between the turn ratio n 1 of the first transformer 119 and the output voltage of the second transformer 129 The turn ratio (n 2 ) can be set.

Meanwhile, FIG. 9 is a graph for explaining a battery charging method using a hybrid converter according to an embodiment of the present invention and conditions for satisfying a zero voltage switching condition.

9, the hybrid converter according to an embodiment of the present invention can charge the battery 300 using a constant current / constant voltage (CC / CV) method, and the end portion of the constant voltage (CV) Can be a design point for satisfying the zero voltage switching (ZVS) condition of the first switch S1 and the second switch S2.

More specifically, the third switch S3 and the fourth switch S4 shared by the soft switching full bridge converter 110 and the resonant half bridge converter 120 are connected to the primary side circuit of the resonant half bridge converter 120, The soft switching condition can be achieved.

The first switch S1 and the second switch S2 provided in the first leg 110-1 of the soft switching full bridge converter 110 are connected to the first transformer 119 using the magnetization inductance of the first transformer 119, Conditions can be achieved.

Therefore, in order to satisfy the soft switching conditions of the first switch S1 and the second switch S2, sufficient energy is required for soft switching, and an appropriate dead time must be set between the two switches. That is, in the above-mentioned fourth operation mode in which the soft switching of the first switch S1 or the second switch S2 is performed, the energy E L of the entire inductor affecting the first leg 110-1 becomes the first Must be greater than the energy E c of the total capacitor on leg 110-1.

Here, the energy Ec of the entire capacitor on the first leg 110-1 can be obtained using the following equation (5).

Figure 112015101083339-pat00005

In Equation 5, C oss is the capacitance of the parasitic capacitor added to each switch, Cx is the capacitance of the first transformer 119, and V s is the input voltage.

In Equation 5, C oss is the capacitance of the parasitic capacitor added to each switch, Cx is the capacitance of the first transformer 119, and V s is the input voltage.

In addition, the energy E L of the entire inductor affecting the first leg 110-1 can be obtained by using the following equation (6).

Figure 112015101083339-pat00006

And L m1 is the magnetizing inductance of the first transformer 119. In Equation 6, I m1, pk is a magnetizing current passing through the primary circuit of a soft-switching full-bridge converter (110), I Lo, max is the output inductor (117 L 1k 1 is the leakage inductance of the first leakage inductor 113, and n 1 is the turn ratio of the first transformer 119.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

110: Soft-switching full-bridge converter
120: Resonant half bridge converter
200: Input capacitor
300: Battery

Claims (14)

A full bridge circuit including first and second legs supplied with input power and provided with first to fourth switches, a first transformer for converting an input voltage transmitted through the full bridge circuit, And a delay switch provided between the plurality of diodes and the circulating diode and the output inductor. The switching regulator includes a plurality of diodes for receiving and rectifying the input voltage converted through the plurality of diodes, a circulating diode and an output inductor for performing freewheeling, Bridge converter; And
A half bridge circuit sharing the second leg with the soft switching full bridge converter, a second transformer converting an input voltage transmitted through the half bridge circuit, a rectifier circuit receiving the input voltage converted through the second transformer, And a resonant half-bridge converter including a plurality of diodes,
Wherein the resonant half bridge converter operates the third switch and the fourth switch shared by the soft switching full bridge converter in a fixed duty according to the resonant frequency of the primary circuit to transfer the input voltage to the second transformer for operation,
Wherein the output voltage of the resonant half bridge converter is set by setting the turn ratio of the first transformer included in the soft switching full bridge converter in consideration when the turn ratio of the second transformer is set. The method according to claim 1,
The soft switching full bridge converter comprising:
And a first output capacitor connected to the output inductor and the circulating diode,
The resonant half bridge converter includes:
And a second output capacitor connected to the plurality of diodes,
Wherein the first output capacitor and the second output capacitor are connected in series. The method according to claim 1,
The soft switching full bridge converter comprising:
A first leg and a second leg connected in parallel,
Wherein the first switch and the second switch are provided on the first leg, the third switch and the fourth switch are provided on the second leg,
Wherein the first switch and the second switch operate symmetrically with a predetermined dead time,
Wherein the third switch and the fourth switch operate symmetrically with a predetermined dead time. The method according to claim 1,
The resonant half bridge converter includes:
And a second input voltage line connected to the second leg,
And a resonant capacitor is provided on the second input voltage line. The method according to claim 1,
Wherein the first switch to the fourth switch comprises:
Wherein a parasitic capacitor and a body diode are connected in parallel to each other. The method according to claim 1,
And the third switch and the fourth switch,
A hybrid converter that switches according to a fixed frequency. The method according to claim 1,
The delay switch includes:
And the second switch is turned on when both the first switch and the fourth switch are in the on-state or both the second switch and the third switch are in the on-state. The method according to claim 1,
The delay switch includes:
A hybrid converter in which a parasitic capacitor and a body diode are connected in parallel. The method according to claim 1,
Wherein the first switch to the fourth switch comprises:
A hybrid converter that turns on by zero voltage switching and turns off by zero current switching. A full bridge circuit including first and second legs supplied with input power and provided with first to fourth switches, a first transformer for converting an input voltage transmitted through the full bridge circuit, A circulation diode and an output inductor for carrying out free wheeling, a delay switch provided between the plurality of diodes and the circulating diode and the output inductor, the circulation diode and the output diode, A soft switching full bridge converter including a first output capacitor coupled to the output inductor; And a half bridge circuit sharing the second leg with the soft switching full bridge converter, a second transformer converting an input voltage transmitted through the half bridge circuit, and a second transformer receiving the input voltage converted through the second transformer A method of driving a hybrid converter including a resonant half bridge converter including a plurality of diodes rectifying and a second output capacitor connected to the plurality of diodes,
The soft switching full bridge converter comprising:
Wherein the first transformer is connected to the first transformer and the second transformer is connected to the first transformer and the second transformer is connected to the second transformer, Supplying the input voltage to the first output capacitor through the delay switch or forming a closed circuit of the circulating diode, the output inductor, and the first output capacitor to supply the power stored in the output inductor to the first output capacitor Supply,
The resonant half bridge converter includes:
Supplies the input voltage to the second output capacitor through the second transformer in accordance with a switching operation of the third switch and the fourth switch,
Wherein the resonant half bridge converter operates the third switch and the fourth switch shared by the soft switching full bridge converter in a fixed duty according to the resonant frequency of the primary circuit to transfer the input voltage to the second transformer for operation,
And setting the output voltage of the resonant half bridge converter by setting the turn ratio of the first transformer included in the soft switching full bridge converter in consideration when setting the turn ratio of the second transformer. 11. The method of claim 10,
And the first transformer is operated by transmitting the input voltage to the first transformer according to the switching operation of the first switch to the fourth switch,
The first switch provided on the upper side of the first leg and the fourth switch provided on the lower side of the second leg are both turned on,
And operating the first transformer by transmitting the input voltage to the first transformer when the second switch provided on the lower side of the first leg and the third switch provided on the upper side of the second leg are turned on In hybrid converter. 11. The method of claim 10,
And the third switch and the fourth switch,
And the switching operation is performed according to the fixed frequency. 11. The method of claim 10,
The soft switching full bridge converter comprising:
And controlling the first output voltage outputted from the first output capacitor by changing the effective duty. 11. The method of claim 10,
Wherein the first switch to the fourth switch comprises:
And a turn-off operation is performed by zero-voltage switching, and the turn-off operation is performed by zero-current switching.
KR1020150145525A 2015-05-29 2015-10-19 Hybrid converter and control method thereof KR101765319B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20150076413 2015-05-29
KR1020150076413 2015-05-29

Publications (2)

Publication Number Publication Date
KR20160140308A KR20160140308A (en) 2016-12-07
KR101765319B1 true KR101765319B1 (en) 2017-08-04

Family

ID=57573915

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150145525A KR101765319B1 (en) 2015-05-29 2015-10-19 Hybrid converter and control method thereof

Country Status (1)

Country Link
KR (1) KR101765319B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108183614B (en) * 2017-12-29 2019-09-17 重庆邮电大学 A kind of composite bridge dual output LLC resonant converter
KR20210010699A (en) 2019-07-17 2021-01-28 현대자동차주식회사 Electric power system for vehicle and method for controlling the same
KR102315046B1 (en) * 2020-09-01 2021-10-20 (주)에이프로 Apparatus of Zero­voltage Discharge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234432A (en) 2010-04-23 2011-11-17 Iwasaki Electric Co Ltd Boost charging circuit and xenon lamp lighting device using the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011234432A (en) 2010-04-23 2011-11-17 Iwasaki Electric Co Ltd Boost charging circuit and xenon lamp lighting device using the same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
K. Saranya et al. "ZVS PWM RESONANT FULL BRIDGE CONVERTER WITH REDUCED CIRCULATING LOSS AND VOLTAGE STRESSES OF BRIDGE RECTIFIER AND VOLTAGE DOUBLER FOR EV BATTERY CHARGERS". ICMACE. 2014.*
P.H. KRISHNA et al. "HYBRID PS FULL BRIDGE AND LLC HALF BRIDGE DC-DC CONVERTER FOR LOW VOLTAGE AND HIGH-CURRENT OUTPUT APPLICATIONS". IJEEER. 2013.06.*

Also Published As

Publication number Publication date
KR20160140308A (en) 2016-12-07

Similar Documents

Publication Publication Date Title
US20220094274A1 (en) Single phase single stage bi-directional level 1 electric vehicle battery charger
US9787190B2 (en) Power conversion device and in-vehicle power supply device equipped with same
Kim et al. Integrated dual full-bridge converter with current-doubler rectifier for EV charger
CN111355398B (en) Bidirectional vehicle-mounted charger circuit integrated with DC/DC converter
Park et al. Design and control of a bidirectional resonant dc–dc converter for automotive engine/battery hybrid power generators
KR101907119B1 (en) Hybrid full-bridge llc converter and control method thereof
KR101884686B1 (en) Active clamp full-bridge converter and control method thereof
US20080170418A1 (en) Dc-dc converter
CN108964469B (en) Full-bridge double LLC resonant converter with parallel-series structure
US9356526B2 (en) DC-DC power conversion apparatus and method
JP2016019463A (en) Pulse width modulation resonant converter, and vehicle charger utilizing the same
CN103201939A (en) Virtual parametric high side mosfet driver
CN111245078A (en) Bidirectional vehicle-mounted charger circuit integrated with DC/DC converter
CN114301300A (en) Wide-range bidirectional resonant soft-switching direct-current converter and control method thereof
Han et al. A high efficiency LLC resonant converter with wide ranged output voltage using adaptive turn ratio scheme for a Li-ion battery charger
KR101765319B1 (en) Hybrid converter and control method thereof
US20220278609A1 (en) Dual-capacitor resonant circuit for use with quasi-resonant zero-current-switching dc-dc converters
Qi et al. 650v GAN based 3.3 kw bi-directional DC-DC converter for high efficiency battery charger with wide battery voltage range
KR101649109B1 (en) Dual full-bridge converter
KR101622139B1 (en) Converter having the series combination of the outputs of full-bridge converter and llc converter
Hsieh et al. An interleaved bidirectional DC-DC converter with zero-voltage-switching
Gu et al. A high efficiency hybrid resonant PWM zero-voltage-switching full-bridge DC-DC converter for electric vehicle battery chargers
KR102479366B1 (en) Battery Charger and Control Methods
CN107425706B (en) Active clamp circuit of DC/DC converter
Blinov et al. Single-Stage Series-Connected Isolated Converters for MVAC to DC Applications

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E90F Notification of reason for final refusal
E701 Decision to grant or registration of patent right