CN104218809A - A circuit device integrating power factor correction and DC-DC conversion - Google Patents
A circuit device integrating power factor correction and DC-DC conversion Download PDFInfo
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- CN104218809A CN104218809A CN201310205542.8A CN201310205542A CN104218809A CN 104218809 A CN104218809 A CN 104218809A CN 201310205542 A CN201310205542 A CN 201310205542A CN 104218809 A CN104218809 A CN 104218809A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
A circuit device integrating power factor correction and DC-DC conversion is provided in the invention, which comprises a DC power source, an current converter, a transformer, a first diode, a second diode and a power factor correction circuit. The power factor correction circuit comprises a third diode, a fourth diode, a first and a second inductors, with one end of the first inductor docking with the cathode of the third diode, one end of the second inductor docking with the anode of the fourth diode, the anode of the third diode docking with the cathode of the fourth diode, and has an input terminal for connecting a AC power source, wherein the first diode, the second diode, the third diode and the fourth diode constitute a bridge rectifier circuit. The circuit device integrates power factor correction and DC-DC conversion circuits, reduces the number of components, enhances the utilization of the components, and is able to output a positive bus voltage and a negative bus voltage.
Description
Technical field
The present invention relates to the circuit arrangement in uninterrupted power supply system, particularly the circuit arrangement of a kind of integrated power factor correcting and DC-dc conversion.
Background technology
At present, along with the continuous progress of power consumption equipment research and development technology, also more and more higher to the requirement of power supply quality, UPS is due to powering to power consumption equipment of can continuing, the guarantee that provide a safety, stable and continued power can be set to electricity consumption, its purposes very extensive, has become the focus of people's research.
Fig. 1 be in prior art the circuit diagram with circuit of power factor correction and DC-to-DC change-over circuit commonly used, as shown in Figure 1, comprise one direct current-DC converting circuit 90 and circuit of power factor correction 80.When the alternating voltage that AC power Vi exports is normal, this electric supply installation obtains a VD by circuit of power factor correction 80 at two electric capacity two ends, when the alternating voltage that AC power Vi exports is abnormal, this UPS obtains a VD by DC-to-DC change-over circuit 90 at two electric capacity two ends, thus achieves not power-off and power.
But, the DC-to-DC change-over circuit 90 of this UPS is connected with two electric capacity with circuit of power factor correction 80 simultaneously, two electric capacity as DC-to-DC change-over circuit 90 and circuit of power factor correction 80 public components and parts and as DC voltage output end, and other components and parts are independently, thus making the quantity of the components and parts in this UPS more, the utilance causing components and parts reduces.Therefore how to reduce the number of components and parts in the circuit arrangement with power factor correction and DC-dc conversion, the utilance improving components and parts is current problem demanding prompt solution.
Summary of the invention
For above-mentioned technical problem, the invention provides the circuit arrangement of a kind of integrated power factor correcting and DC-dc conversion, the circuit arrangement of this integrated power factor correcting and DC-dc conversion can reduce the quantity of diode and inductance, improve the utilance of diode and inductance, lower withstand voltage diode can be used simultaneously, reduce equipment cost.
To achieve these goals, the invention provides the circuit arrangement of a kind of integrated power factor correcting and DC-dc conversion, comprising:
DC power supply, for providing a direct voltage;
Converter, comprises input and output, and the input of described converter is electrically connected to described DC power supply;
Transformer, comprises primary side and secondary side, and the primary side of described transformer is electrically connected to the output of described converter;
First diode and the second diode, the anode of described first diode docks with the negative electrode of described second diode;
Circuit of power factor correction, described circuit of power factor correction comprises the 3rd diode, the 4th diode, the first inductance and the second inductance, one end of described first inductance is docked with the negative electrode of described 3rd diode, one end of described second inductance is docked with the anode of described 4th diode, the anode of described 3rd diode and the negative electrode docking of the 4th diode, described circuit of power factor correction has the input for connecting an AC power;
Wherein said first diode, the second diode, the 3rd diode and the 4th diode form bridge rectifier, and the secondary side of described transformer is electrically connected to the input of described bridge rectifier.
Circuit arrangement of the present invention is by bridge rectifier and public 3rd diode of circuit of power factor correction, the 4th diode and the first inductance and the second inductance, circuit arrangement of the present invention reduces a rectifier bridge and an inductance, thus reduce heating and the loss of circuit arrangement, also reduce cost.
Preferably, the circuit arrangement of integrated power factor correcting and DC-dc conversion also comprises relay and AC power, the input of described circuit of power factor correction is positioned at the Nodes of the anode of described 3rd diode and the negative electrode docking of the 4th diode, described AC power is electrically connected to the input of described circuit of power factor correction by described relay, for providing an alternating voltage.
Preferably, circuit of power factor correction also comprises: the 5th diode, the first electric capacity and the first switching device, and the 6th diode, the second electric capacity and second switch device.The anode of described 5th diode and one end of described first switching device are connected to the other end of described first inductance, the negative electrode of described 5th diode is electrically connected with one end of described first electric capacity, and the other end of described first electric capacity is connected to the other end of described first switching device and ground connection; One end of described second electric capacity is connected to one end of described second switch device and ground connection, the negative electrode of described 6th diode and the other end of described second switch device are connected to the other end of described second inductance, and the anode of described 6th diode is connected with the other end of described second electric capacity.Wherein the first electric capacity can be used for the positive bus voltage needed for output, and the second electric capacity can be used for the negative bus voltage needed for output one.
In a preferred embodiment, first switching device comprises a MOSFET, the anode of described 5th diode and the drain electrode of a described MOSFET are connected to the other end of described first inductance, the negative electrode of described 5th diode is electrically connected with one end of described first electric capacity, and the other end of described first electric capacity is connected to the source electrode of a described MOSFET and ground connection; Described second switch device comprises the 2nd MOSFET, the negative electrode of described 6th diode and the source electrode of the 2nd MOSFET are connected to the other end of described second inductance, the anode of described 6th diode is electrically connected with one end of described second electric capacity, and the other end of described second electric capacity is connected to the drain electrode of described 2nd MOSFET and ground connection.
In another preferred embodiment, first switching device comprises an IGBT, the anode of described 5th diode and the collector electrode of an IGBT are connected to the other end of described first inductance, the negative electrode of described 5th diode is electrically connected with one end of described first electric capacity, and the other end of described first electric capacity is connected to the emitter of a described IGBT and ground connection; Described second switch device comprises the 2nd IGBT, the negative electrode of described 6th diode and the emitter of described 2nd IGBT are connected to the other end of described second inductance, the anode of described 6th diode is electrically connected with one end of described second electric capacity, and the other end of described second electric capacity is connected to the collector electrode of described 2nd IGBT and ground connection.
Preferably, converter comprises the push-pull circuit be made up of two MOSFET.
Preferably, converter comprises the half-bridge circuit be made up of two MOSFET.
Preferably, converter comprises the full-bridge circuit be made up of four MOSFET.
Preferably, converter comprises the push-pull ortho-exciting circuit be made up of two MOSFET.
The present invention also provides a kind of uninterrupted power supply system comprising the circuit arrangement of above-mentioned integrated power factor correcting and DC-dc conversion, uninterrupted power supply system also comprises control device, and control device is used for providing pulse width modulating signal to converter, the first switching device and second switch device respectively.By control device, pulse-width modulation is carried out to the MOSFET in converter, the first switching device and second switch device.
The present invention also provides a kind of method of supplying power to, comprise the steps: that, when the alternating voltage of described AC power is normal, described uninterrupted power supply system is changed described alternating voltage by described control device and described circuit of power factor correction and exported a VD; When the alternating voltage of described AC power is abnormal, described uninterrupted power supply system is jointly changed the direct voltage of described DC power supply by described control device, DC power supply, converter, transformer, the first diode, the second diode and circuit of power factor correction and is exported a VD.
Preferably, when the alternating voltage of described AC power is abnormal, make each MOSFET in described converter with pulse width modulation mode work by described control device, make described first switching device with the conducting in turn of predetermined cycle and cut-off by described control device, and make described second switch device with the conducting in turn of predetermined cycle and cut-off, when described first switching device cut-off, described second switch break-over of device, when described first switch device conductive, described second switch device cut-off.Namely by the once boosting of converter, improve operating efficiency.
Preferably, when the alternating voltage of described AC power is abnormal, by described control device, each MOSFET in described converter is worked in the mode of fixed duty cycle, by the dc voltage boost of described direct current to the first alternating voltage, make described first switching device with the conducting in turn of predetermined cycle and pulse width modulation mode work, and make described second switch device with the conducting in turn of predetermined cycle and pulse width modulation mode work; And when described second switch break-over of device, described first switching device is with pulse width modulation mode work, thus described first alternating voltage is boosted to positive bus voltage again, when described first switch device conductive, described first alternating voltage, with pulse width modulation mode work, is boosted to negative bus voltage by described second switch again.
Preferably, when the alternating voltage of described AC power is abnormal, by described control device, each MOSFET in described converter is worked, by the dc voltage boost of described direct current to the first alternating voltage in the mode of fixed duty cycle; And provide identical pulse-width signal to described first switching device and second switch device by described control device, make the conducting simultaneously of described first switching device and second switch device or cut-off, thus described first alternating voltage is boosted again and obtains positive bus voltage and negative bus voltage simultaneously.
Accompanying drawing explanation
Referring to accompanying drawing, embodiments of the present invention is further illustrated, wherein:
Fig. 1 is the circuit diagram of a kind of UPS of prior art.
Fig. 2 is the circuit diagram of the integrated power factor correcting of the present invention's first execution mode and the circuit arrangement of DC-dc conversion.
Fig. 3 is the circuit diagram of the circuit arrangement shown in Fig. 2 under AC power mode of operation.
Fig. 4 is the circuit diagram that the circuit arrangement shown in Fig. 3 exports positive bus voltage in the positive half period of AC power.
Fig. 5 is the circuit diagram that the circuit arrangement shown in Fig. 3 exports negative bus voltage in the negative half-cycle of AC power.
Fig. 6 is the circuit diagram that the circuit arrangement shown in Fig. 2 exports positive bus voltage under DC power supply mode of operation.
Fig. 7 is the circuit diagram that the circuit arrangement shown in Fig. 2 exports negative bus voltage under DC power supply mode of operation.
Fig. 8 is the circuit diagram of the circuit of power factor correction in the present invention's second execution mode.
Fig. 9 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 3rd execution mode and the circuit arrangement of DC-dc conversion.
Figure 10 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 4th execution mode and the circuit arrangement of DC-dc conversion.
Figure 11 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 5th execution mode and the circuit arrangement of DC-dc conversion.
Figure 12 is the circuit diagram of the uninterrupted power supply system of the present invention's better embodiment.
Main device symbol description
10 push-pull circuits
20 half-bridge circuits
30 full-bridge circuits
40 push-pull ortho-exciting circuit
2 bridge rectifiers
3 circuit of power factor correction
The input of 4 circuit of power factor correction
5 control device
200 uninterrupted power supply systems
L1, L2 inductance
R relay
Vi AC power
C1, C2, C3, C4, C5 electric capacity
T1～T12?MOSFET
T13、T14?IGBT
B DC power supply
Tr transformer
D1 ~ D8 diode
Embodiment
In order to make object of the present invention, technical scheme and advantage are clearly understood, below in conjunction with accompanying drawing, by specific embodiment, the present invention is described in more detail.
Fig. 2 is the circuit diagram of the integrated power factor correcting of the present invention's first execution mode and the circuit arrangement of DC-dc conversion.As shown in Figure 2, the circuit arrangement of integrated power factor correcting and DC-dc conversion comprises DC power supply B, converter 10, transformer Tr, diode D1, diode D2 and circuit of power factor correction 3, converter 10 comprises the MOSFET that two have parasitic anti-parallel diodes respectively, i.e. MOSFET T3 and MOSFET T4, the source electrode of MOSFET T3 is connected with the source electrode of MOSFET T4 and ground connection, the drain electrode of MOSFET T3 is connected to one end of the primary side of transformer Tr, and the drain electrode of MOSFET T4 is connected to the other end of the primary side of transformer Tr.The minus earth of DC power supply B and anode are connected on the centre tap of the primary side of transformer Tr.Thus make MOSFET T3 and MOSFET T4 form push-pull circuit 10.Circuit of power factor correction 3 comprises diode D3, inductance L 1, diode D5, electric capacity C1 and has the MOSFET T1 of parasitic anti-parallel diodes D7, the negative electrode of diode D3 is connected with one end of inductance L 1, the anode of diode D5 and the drain electrode of MOSFET T1 are connected to the other end of inductance L 1, the negative electrode of diode D5 is electrically connected with one end of electric capacity C1, and the other end of electric capacity C1 is connected to the source electrode of MOSFET T1 and ground connection.Circuit of power factor correction 3 also comprises diode D4, inductance L 2, diode D6, electric capacity C2 and has the MOSFET T2 of parasitic anti-parallel diodes D8, the anode of diode D4 is connected with one end of inductance L 2, the negative electrode of diode D6 and the source electrode of MOSFET T2 are connected to the other end of inductance L 2, the anode of diode D6 is electrically connected with one end of electric capacity C2, and the other end of electric capacity C2 is connected to the drain electrode of MOSFET T2 and ground connection.The anode of diode D1 is connected with the negative electrode of diode D2, and diode D1 negative electrode is connected with the negative electrode of diode D3, the anode of diode D2 is connected with the anode of diode D4, make diode D1, diode D2, diode D3 and diode D4 form a bridge rectifier 2, thus make bridge rectifier 2 and circuit of power factor correction 3 share diode D3 and diode D4.Two terminals of the secondary side of transformer Tr are connected to the anode of diode D1 and the anode of diode D3, and namely the secondary side of transformer Tr is connected to the input of bridge rectifier 2.AC power Vi is connected to the input 4 of circuit of power factor correction 3 by relay R, namely at the Nodes of the anode of diode D3 and the negative electrode of diode D4.
Fig. 3 is the circuit diagram of the circuit arrangement shown in Fig. 2 under AC power mode of operation.Under AC power mode of operation, MOSFET T3 and MOSFET T4 ends, and AC power Vi is connected to the input 4 of circuit of power factor correction 3 by relay R, exports positive bus voltage and a negative bus voltage by circuit of power factor correction 3.
Respectively the AC power mode of operation shown in Fig. 3 will be described below.
Fig. 4 is the circuit diagram that the circuit arrangement shown in Fig. 3 exports positive bus voltage in the positive half period of AC power.As shown in Figure 4, comprise AC power Vi, relay R, diode D3, inductance L 1, diode D5, electric capacity C1 and there is the MOSFET T1 of parasitic anti-parallel diodes D7.In the positive half period of AC power, relay R conducting, MOSFET T2 ends, and MOSFET T1 is continuous conducting and cut-off under pulse width modulating signal (PWM), thus obtains required positive bus voltage at the two ends of capacitor C1.
Fig. 5 is the circuit diagram that the circuit arrangement shown in Fig. 3 exports negative bus voltage in the negative half-cycle of AC power.As shown in Figure 5, comprise AC power Vi, relay R, diode D4, inductance L 2, diode D6, electric capacity C2 and there is the MOSFET T2 of parasitic anti-parallel diodes D8.In the negative half-cycle of AC power, relay R conducting, MOSFET T1 ends, and MOSFET T2 is continuous conducting and cut-off under a pulse width modulating signal, thus obtains required negative bus voltage at the two ends of electric capacity C2.In the conducting of MOSFET T2 and the transfer process of cut-off, because diode D4 is directly connected with AC power Vi, therefore the vice-side winding two ends of transformer Tr relatively with the disturbance of ground just low frequency, it can not have influence on the interlock circuit of primary side by transformer Tr and cause electromagnetic interference problem, thus has influence on the EMC performance of whole device.
Therefore, we can obtain a positive bus voltage at the positive half period of AC power, obtain a negative bus voltage at the negative half-cycle of AC power.In an actual embodiment, the size of positive bus voltage and negative bus voltage can obtain respectively by boosting modulation, and positive bus voltage can be identical with the size of negative bus voltage, can not certainly be identical.
Fig. 6 is the circuit diagram that the circuit arrangement shown in Fig. 2 exports positive bus voltage under DC power supply mode of operation.As shown in Figure 6, converter 10, DC power supply B, transformer Tr, bridge rectifier 2, inductance L 1, inductance L 2, diode D5, MOSFET T1 and electric capacity C1 is comprised.
Fig. 7 is the circuit diagram that the circuit arrangement shown in Fig. 2 exports negative bus voltage under DC power supply mode of operation.As shown in Figure 7, converter 10, DC power supply B, transformer Tr, bridge rectifier 2, inductance L 1, inductance L 2, diode D6, MOSFET T2 and electric capacity C2 is comprised.
Under DC power supply mode of operation of the present invention, converter 10, DC power supply B and transformer Tr constitute a DC-AC conversion circuit, DC voltage conversion for being provided by DC power supply B becomes an alternating voltage, thus as a stand-by AC power supply.In other examples, converter 10, DC power supply B and transformer Tr directly can replace with an AC power for subsequent use, and the output of AC power for subsequent use is connected with the input of bridge rectifier 2, for providing another alternating voltage.Certainly, in another embodiment, can also be that converter 10 and DC power supply B are replaced with another AC power for subsequent use, the output of this AC power for subsequent use be connected with the primary side of transformer Tr, for providing another alternating voltage.
Fig. 8 is the circuit diagram of the circuit of power factor correction in the present invention's second execution mode.The difference of the circuit of power factor correction 3 in itself and Fig. 2 is, the first switching device is IGBT T13, and second switch device is IGBT T14.The anode of diode D5 and the collector electrode of IGBT T13 are connected to the other end of inductance L 1, the negative electrode of diode D5 is electrically connected with one end of electric capacity C1, the other end of electric capacity C1 is connected to the emitter of IGBT T13 and ground connection, the negative electrode of diode D6 and the emitter of IGBT T14 are connected to the other end of inductance L 2, the anode of diode D6 is electrically connected with one end of electric capacity C2, and the other end of electric capacity C6 is connected to the collector electrode of IGBT T14 and ground connection.In other examples, IGBT T13 and IGBT T14 can also have anti-parallel diodes respectively.
Fig. 9 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 3rd execution mode and the circuit arrangement of DC-dc conversion.Comprise DC power supply B, converter 20 and transformer Tr.Wherein converter comprises the half-bridge circuit 20 be made up of electric capacity C3, electric capacity C4, MOSFET T5 and MOSFET T6.
Figure 10 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 4th execution mode and the circuit arrangement of DC-dc conversion.Comprise DC power supply B, converter 30 and transformer Tr.Wherein converter comprises the full-bridge circuit 30 be made up of four MOSFET T7, the MOSFET T8 with anti-parallel diodes, MOSFET T9 and MOSFET T10.
Figure 11 is the circuit diagram of the DC-AC conversion in the integrated power factor correcting of the present invention's the 5th execution mode and the circuit arrangement of DC-dc conversion.Comprise DC power supply B, converter 40 and transformer Tr.Wherein converter comprises the push-pull ortho-exciting circuit 40 be made up of two MOSFET T11, MOSFET T12 with anti-parallel diodes and electric capacity C5.
It will be appreciated by those skilled in the art that, in an embodiment of the present invention, other circuit structures can also be adopted to realize DC-AC conversion, thus an alternating voltage for subsequent use is provided.In other examples, MOSFET T1, MOSFET T2, MOSFET T3, MOSFET T4, MOSFET T5, MOSFET T6, MOSFET T7, MOSFET T8, MOSFET T9, MOSFET T10, MOSFET T11 or MOSFET T12 can not have the diode of reverse parallel connection yet.
Figure 12 is the circuit diagram of the uninterrupted power supply system of the present invention's better embodiment.Wherein control device 5 is preferably PWM controller, the pin (not shown) of control device 5 is connected with the grid of MOSFET T1, MOSFET T2, MOSFET T3 and MOSFET T4 respectively, for providing pulse width modulating signal to respectively the MOSFET T3 in converter and MOSFET T4 and the first switching device MOSFET T1 and second switch device MOSFET T2, thus the voltage required for exporting at electric capacity C1 and electric capacity C2 two ends.
In a method of supplying power to of the present embodiment, when AC power Vi is normal, by control device 5, MOSFET T3 and MOSFET T4 is ended, and provide pulse width modulating signal to the first switching device MOSFET T1 and second switch device MOSFET T2, change alternating voltage by control device 5 and circuit of power factor correction 3 and export required positive/negative bus voltage.
In another preferred method of supplying power to of the present invention, when AC power Vi is abnormal, there is provided pulse-width signal to MOSFET T3 and MOSFET T4 by control device 5, make MOSFET T1 with the conducting in turn of predetermined cycle and cut-off by control device 5, and make MOSFET T2 with the conducting in turn of predetermined cycle and cut-off, and when MOSFET T1 ends, MOSFET T2 conducting, when MOSFET T1 conducting, MOSFET T2 ends.Namely, within the cycle very first time, make MOSFET T2 conducting, MOSFET T1 by, electric capacity C1 obtains required positive bus voltage.Within the second time cycle, make MOSFET T1 conducting, MOSFET T2 by, electric capacity C2 obtains required negative bus voltage.Control mode in 3rd time cycle is identical with in the cycle very first time, and the control mode in the 4th time cycle is identical with in the second time cycle, and circulation is gone down successively, thus the positive bus voltage of output in turn and negative bus voltage.
In another preferred method of supplying power to of the present invention, when AC power Vi is abnormal, the pulse width modulating signal of MOSFET T3 and MOSFET T4 mono-fixed duty cycle given by control device 5, MOSFET T3 and MOSFET T4 under pulse width modulating signal and transformer Tr the dc voltage boost of DC power supply B is converted to the first alternating voltage, and output to the input of bridge rectifier 2.And make MOSFET T1 with the conducting in turn of predetermined cycle and pulse width modulation mode work by control device 5, and make MOSFET T2 with the conducting in turn of predetermined cycle and pulse width modulation mode work; And when MOSFET T2 conducting, first alternating voltage with pulse width modulation mode work, thus is boosted to positive bus voltage by MOSFET T1 again, when MOSFET T1 conducting, first alternating voltage, with pulse width modulation mode work, is boosted to negative bus voltage by MOSFET T2 again.Namely within the cycle very first time, make MOSFET T2 conducting, provide a pulse-width signal to MOSFET1, thus the first alternating voltage is boosted again obtain positive bus voltage.Within the second time cycle, make MOSFET T1 conducting, provide a pulse-width signal to MOSFET T2, thus the first alternating voltage is boosted again obtain negative bus voltage.Control mode in 3rd time cycle is identical with the cycle very first time, and the control mode in the 4th time cycle is identical with the second time cycle, and circulation is gone down successively, thus the positive bus voltage of output in turn and negative bus voltage.
In another preferred method of supplying power to of the present invention, when AC power Vi is abnormal, the pulse width modulating signal of MOSFET T3 and MOSFET T4 mono-fixed duty cycle given by control device 5, MOSFET T3 and MOSFET T4 under pulse width modulating signal and transformer Tr the dc voltage boost of DC power supply B is converted to the first alternating voltage, and output to the input of bridge rectifier 2.There is provided an identical pulse width modulating signal with MOSFET T2 to MOSFET T1 by control device 5, i.e. conducting simultaneously or cut-off simultaneously, thus the first alternating voltage is boosted again and obtains positive bus voltage and negative bus voltage simultaneously.
Although the present invention is described by preferred embodiment, but the present invention is not limited to embodiment as described herein, also comprises done various change and change without departing from the present invention.
Claims (12)
1. a circuit arrangement for integrated power factor correcting and DC-dc conversion, comprising:
DC power supply (B), for providing a direct voltage;
Converter (10; 20; 30; 40), input and output is comprised, described converter (10; 20; 30; 40) input is electrically connected to described DC power supply (B);
Transformer (Tr), comprises primary side and secondary side, and the primary side of described transformer (Tr) is electrically connected to described converter (10; 20; 30; 40) output;
First diode (D1) and the second diode (D2), the anode of described first diode (D1) docks with the negative electrode of described second diode (D2);
Circuit of power factor correction (3), described circuit of power factor correction (3) comprises the 3rd diode (D3), 4th diode (D4), first inductance (L1) and the second inductance (L2), one end of described first inductance (L1) is docked with the negative electrode of described 3rd diode (D3), one end of described second inductance (L2) is docked with the anode of described 4th diode (D4), the anode of described 3rd diode (D3) and the negative electrode docking of the 4th diode (D4), described circuit of power factor correction (3) has the input (4) for connecting an AC power,
Wherein said first diode (D1), the second diode (D2), the 3rd diode (D3) and the 4th diode (D4) form bridge rectifier (2), and the secondary side of described transformer (Tr) is electrically connected to the input of described bridge rectifier (2).
2. the circuit arrangement of integrated power factor correcting according to claim 1 and DC-dc conversion, it is characterized in that, also comprise relay (R) and AC power (Vi), the input (4) of described circuit of power factor correction (3) is positioned at the Nodes of the anode of described 3rd diode (D3) and the negative electrode docking of the 4th diode (D4), described AC power (Vi) is electrically connected to the input (4) of described circuit of power factor correction (3), for providing an alternating voltage by described relay (R).
3. the circuit arrangement of integrated power factor correcting according to claim 1 and DC-dc conversion, is characterized in that, described circuit of power factor correction also comprises:
5th diode (D5), the first electric capacity (C1) and the first switching device (T1; T13), the anode of described 5th diode (D5) and described first switching device (T1; T13) one end is connected to the other end of described first inductance (L1), and the negative electrode of described 5th diode (D5) is electrically connected with one end of described first electric capacity (C1), and the other end of described first electric capacity (C1) is connected to described first switching device (T1; T13) the other end ground connection; And
6th diode (D6), the second electric capacity (C2) and second switch device (T2; T14), one end of described second electric capacity (C2) is connected to described second switch device (T2; T14) one end ground connection, the negative electrode of described 6th diode (D6) and described second switch device (T2; T14) the other end is connected to the other end of described second inductance (L2), and the anode of described 6th diode (D6) is connected with the other end of described second electric capacity (C2).
4. the integrated power factor correcting according to any one of claims 1 to 3 and the circuit arrangement of DC-dc conversion, is characterized in that, described converter comprises by two MOSFET(T3, T4) push-pull circuit (10) that forms.
5. the integrated power factor correcting according to any one of claims 1 to 3 and the circuit arrangement of DC-dc conversion, is characterized in that, described converter comprises by two MOSFET(T5, T6) half-bridge circuit (20) that forms.
6. the integrated power factor correcting according to any one of claims 1 to 3 and the circuit arrangement of DC-dc conversion, is characterized in that, described converter comprises by four MOSFET(T7, T8, T9, T10) full-bridge circuit (30) that forms.
7. the integrated power factor correcting according to any one of claims 1 to 3 and the circuit arrangement of DC-dc conversion, is characterized in that, described converter comprises by two MOSFET(T11, T12) the push-pull ortho-exciting circuit (40) that forms.
8. one kind comprises the uninterrupted power supply system of the circuit arrangement of integrated power factor correcting described in any one of claim 1 to 7 and DC-dc conversion, described uninterrupted power supply system (200) also comprises control device (5), and described control device (5) is for giving described converter (10 respectively; 20; 30; 40), the first switching device (T1; And second switch device (T2 T13); T14) pulse width modulating signal is provided.
9., about a method of supplying power to for uninterrupted power supply system according to claim 8, comprise the steps:
A (), when the alternating voltage of described AC power (Vi) is normal, described uninterrupted power supply system (200) is changed described alternating voltage by described control device (5) and described circuit of power factor correction (3) and is exported a VD;
B (), when the alternating voltage of described AC power (Vi) is abnormal, described uninterrupted power supply system (200) is by described control device (5), DC power supply (B), converter (10; 20; 30; 40), transformer (Tr), the first diode (D1), the second diode (D2) and circuit of power factor correction (3) are jointly changed the direct voltage of described DC power supply (B) and export a VD.
10. method of supplying power to according to claim 9, is characterized in that, described step (b) also comprises the steps:
Described converter (10 is made by described control device (5); 20; 30; 40) each MOSFET(T3, T4 in; T5, T6; T7, T8, T9, T10; T11, T12) with pulse width modulation mode work, make described first switching device (T1 by described control device (5); T13) with the conducting in turn of predetermined cycle and cut-off, and described second switch device (T2 is made; T14) with the conducting in turn of predetermined cycle and cut-off, as described first switching device (T1; T13) during cut-off, described second switch device (T2; T14) conducting, as described first switching device (T1; T13) during conducting, described second switch device (T2; T14) end.
11. method of supplying power to according to claim 9, is characterized in that, described step (b) also comprises the steps:
Described converter (10 is made by described control device (5); 20; 30; 40) each MOSFET(T3, T4 in; T5, T6; T7, T8, T9, T10; T11, T12) work in the mode of fixed duty cycle, by the dc voltage boost of described direct current (B) to the first alternating voltage, make described first switching device (T1; T13) with the conducting in turn of predetermined cycle and pulse width modulation mode work, and described second switch device (T2 is made; T14) with the conducting in turn of predetermined cycle and pulse width modulation mode work; And
As described second switch device (T2; T14) during conducting, described first switching device (T1; T13) with pulse width modulation mode work, thus described first alternating voltage is boosted to positive bus voltage again, as described first switching device (T1; T13) during conducting, described second switch (T2; T14) with pulse width modulation mode work, described first alternating voltage is boosted to negative bus voltage again.
12. method of supplying power to according to claim 9, is characterized in that, described step (b) also comprises the steps:
Described converter (10 is made by described control device (5); 20; 30; 40) each MOSFET(T3, T4 in; T5, T6; T7, T8, T9, T10; T11, T12) work in the mode of fixed duty cycle, by the dc voltage boost of described direct current (B) to the first alternating voltage; And
By described control device (5) to described first switching device (T1; And second switch device (T2 T13); T14) provide identical pulse-width signal, make described first switching device (T1; And second switch device (T2 T13); T14) conducting simultaneously or cut-off, thus described first alternating voltage is boosted again and obtains positive bus voltage and negative bus voltage simultaneously.
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