CN109742927B - Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter - Google Patents
Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter Download PDFInfo
- Publication number
- CN109742927B CN109742927B CN201910014599.7A CN201910014599A CN109742927B CN 109742927 B CN109742927 B CN 109742927B CN 201910014599 A CN201910014599 A CN 201910014599A CN 109742927 B CN109742927 B CN 109742927B
- Authority
- CN
- China
- Prior art keywords
- voltage
- bus
- power supply
- capacitor
- auxiliary power
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 154
- 238000004804 winding Methods 0.000 claims abstract description 84
- 238000004146 energy storage Methods 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 9
- 238000011217 control strategy Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a circuit for equalizing voltage and auxiliary power supply of a bus capacitor of a half-bridge power converter, which comprises a first bus capacitor, a second bus capacitor, a first switch tube, a second switch tube, a first diode, a second diode, a first equalizing diode, a second equalizing diode, a flyback transformer and a current transformer; the flyback transformer is provided with two groups of primary windings and N groups of auxiliary power supply windings configured according to the auxiliary power supply requirements of the power converter. The invention realizes the balance of the bus capacitor voltage in a voltage competition mode, does not influence normal auxiliary power supply, and solves the problem of half-bridge bus voltage balance on the premise of not increasing the hardware cost and the control complexity of the system.
Description
Technical Field
The invention belongs to the field of power electronic conversion, and particularly relates to a circuit for equalizing voltage and assisting power supply of a bus capacitor of a half-bridge power converter.
Background
The half-bridge power converter generally refers to a topological structure formed by connecting two groups of capacitors in series, and is widely applied to various alternating current-direct current, direct current-direct current and direct current-alternating current power supplies, such as a half-bridge power factor corrector, a three-level direct current converter, a Neutral Point Clamped (NPC) inverter and the like, as one of basic topologies in the field of power electronic conversion. However, due to factors such as inconsistent parasitic parameters of the circuit, incomplete symmetry of circuit control and the like existing in practice, the problem of uneven voltage of the two groups of bus capacitors is caused. The voltage unbalance of the capacitor can bring a series of problems of unequal voltage stress of components, reduced output power quality of the converter, even incapability of working normally and the like, and the balance control of the bus voltage equalizing of the half-bridge power converter is a problem which is widely focused in academia and engineering practice.
The existing voltage balance control method of the bus capacitor of the half-bridge power converter can be mainly divided into two major categories, namely a hardware method and a software method. The hardware method comprises the following steps: the half-bridge bus capacitor adopts two groups of voltage sources to supply power, a special capacitor voltage balance converter or a voltage balancer is added, a specially designed filter is added in an inverter output filter to introduce feedback power, and midpoint balance control is performed in a hardware control circuit through capacitor differential pressure feedforward or modulated wave feedback and the like. The thought of the software method is approximately the same, namely, a bus balance control algorithm is introduced in PWM calculation, small vectors are reasonably applied in a space vector algorithm of the three-level converter, zero sequence components are added in the output of the three-level converter, and the like. These methods either increase the complexity of the circuit or increase the complexity of the control, which has a negative impact on the output characteristics of the converter, even on the overall performance.
Disclosure of Invention
In order to solve the technical problems of the background technology, the invention provides a circuit for bus voltage equalizing and auxiliary power supply of a half-bridge type power converter, which realizes the bus voltage equalizing of the half-bridge type power converter on the basis of not increasing a hardware circuit and not improving the control complexity.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a circuit for equalizing voltage and auxiliary power supply of a bus capacitor of a half-bridge power converter comprises a first bus capacitor, a second bus capacitor, a first switch tube, a second switch tube, a first diode, a second diode, a first equalizing voltage diode, a second equalizing voltage diode, a flyback transformer and a current transformer; the flyback transformer is provided with two groups of primary windings and N groups of auxiliary power supply windings configured according to the auxiliary power supply requirement of the power converter, wherein N is more than or equal to 1; the positive electrode of the first bus capacitor is connected with the positive electrode of the power converter bus, the negative electrode of the first bus capacitor is connected with the positive electrode of the second bus capacitor and is grounded, the negative electrode of the second bus capacitor is connected with the negative electrode of the power converter bus, the positive electrode of the first diode is connected with the positive electrode of the power converter bus, the negative electrode of the first diode is connected with the drain electrode of the first switch tube, the first end of the first group primary winding of the flyback transformer is connected with the source electrode of the first switch tube and the negative electrode of the first voltage-sharing diode, the second end of the first group primary winding of the flyback transformer is connected with the input end of the current transformer, the positive electrode of the second diode is connected with the input end of the first voltage-sharing diode, the negative electrode of the second diode is connected with the positive electrode of the auxiliary power supply winding of the second switch tube, the second end of the second group primary winding of the flyback transformer is connected with the positive electrode of the auxiliary power supply winding of the auxiliary power supply capacitor, and the auxiliary power supply winding of each auxiliary power supply capacitor is connected with the positive electrode of the auxiliary power supply capacitor.
Based on the preferable scheme of the technical scheme, the transformation ratio of the two groups of primary windings of the flyback transformer is 1:1.
based on the preferable scheme of the technical scheme, the ratio of the auxiliary power supply voltage provided by each group of auxiliary power supply windings to the bus capacitor voltage with lower voltage in the two bus capacitors is equal to the turn ratio of the auxiliary power supply windings to the primary winding.
Based on the preferable scheme of the technical scheme, a primary voltage stabilizing circuit is arranged at the output end of each group of auxiliary power supply windings of the flyback transformer.
Based on the preferable scheme of the technical scheme, the first bus capacitor, the first diode, the first switch tube and the first group of primary windings of the flyback transformer form an energy storage passage of the upper half bus of the power converter; the second bus capacitor, the second diode, the second switching tube and a second group of primary windings of the flyback transformer form an energy storage passage of a lower half bus of the power converter; the first bus capacitor, the second voltage-sharing diode and the second group of primary windings of the flyback transformer form an energy release passage of the upper half bus of the power converter; the second bus capacitor, the first voltage-equalizing diode and the first group of primary windings of the flyback transformer form an energy release passage of the lower half bus of the power converter.
Based on the preferable scheme of the technical scheme, the first switching tube and the second switching tube adopt synchronous control working modes and are simultaneously turned on and turned off.
Based on the preferable scheme of the technical scheme, when the first switch tube and the second switch tube are conducted, the energy storage channel corresponding to the capacitor with higher voltage in the two bus capacitors is conducted, and the energy storage channel corresponding to the capacitor with lower voltage is blocked by the reverse bias of the diode; when the first switch tube and the second switch tube are turned off, the energy release passage corresponding to the capacitor with lower voltage in the two bus capacitors is conducted, and the energy release passage corresponding to the capacitor with higher voltage is reversely blocked by the voltage equalizing diode.
Based on the preferable scheme of the technical scheme, when the first switching tube and the second switching tube are turned off, the rectifier diode on the auxiliary power supply winding of the flyback transformer is turned on to provide auxiliary current.
Based on the preferable scheme of the technical scheme, when the voltages of the first bus capacitor and the second bus capacitor are unequal, the capacitor with higher voltage provides auxiliary power supply energy, and provides balanced energy for the capacitor with lower voltage; when the voltages of the first bus capacitor and the second bus capacitor are equal, auxiliary power supply energy is provided by the first bus capacitor and the second bus capacitor in a balanced mode.
Based on the preferred scheme of the technical scheme, the current of the two groups of primary windings of the flyback transformer is detected through the current transformer, and a peak current control strategy for limiting the maximum duty ratio is adopted, wherein the maximum duty ratio is limited to 0.5.
The beneficial effects brought by adopting the technical scheme are that:
(1) The invention adopts an auxiliary power supply for supplying power to the control circuit in a power supply system, realizes the balance of bus capacitor voltage in a voltage competition mode, does not influence normal auxiliary power supply, and solves the problem of half-bridge bus voltage balance on the premise of not increasing the hardware cost and the control complexity of the system.
(2) The invention omits the traditional equalizing resistor, the auxiliary power is taken from the capacitor with high voltage, the equalizing energy is not needed to be coupled through the winding, thereby avoiding leakage inductance loss, realizing small energy loss added by voltage equalization and having high efficiency.
(3) The auxiliary power supply voltage reflects the voltage of the bus capacitor with lower voltage, and when the voltage difference of the two bus capacitors is overlarge, the auxiliary power supply voltage is lower, so that the circuit can automatically realize the overlarge protection of the voltage difference of the bus capacitors, and further can simplify the control circuit of the converter.
Drawings
FIG. 1 is a circuit topology diagram of bus capacitor voltage equalizing and auxiliary power supply in an embodiment;
fig. 2 is a schematic diagram of an operation mode when the upper half bus capacitor voltage is higher in the embodiment, including two sub-diagrams (a) and (b), which respectively show that the switching tubes S1 and S2 are turned on and the switching tubes S1 and S2 are turned off;
fig. 3 is a schematic diagram of an operation mode when the lower half bus capacitor voltage is higher in the embodiment, including two sub-diagrams (a) and (b), which respectively represent that the switching tubes S1 and S2 are turned on and off;
fig. 4 is a schematic diagram of an operation mode when the voltages of the bus capacitors are the same in the embodiment, and includes two sub-diagrams (a) and (b) respectively showing that the switching tubes S1 and S2 are turned on and the switching tubes S1 and S2 are turned off;
FIG. 5 is a waveform diagram of the whole process simulation when the upper half bus capacitor voltage is higher in the embodiment.
Detailed Description
The technical scheme of the present invention will be described in detail below with reference to the accompanying drawings.
The circuit topology adopted in this embodiment is shown in fig. 1, the power input is two groups of half-bridge bus capacitors C1 and C2, and the primary side of the flyback transformer T is provided with switching tubes S1 and S2, diodes D1 and D2, voltage-equalizing diodes D3 and D4, and a current transformer CT. The secondary side of the flyback transformer T is auxiliary power supply output, multiple groups of secondary sides can be provided according to the auxiliary power supply requirement of a power supply system, two groups of secondary sides are adopted for description in the embodiment, and each group of secondary sides respectively comprises a secondary side rectifier diode D5 and D6 and a secondary side filter capacitor C3 and C4.
Aiming at the situation of uneven half-bridge bus voltage, the auxiliary power supply and bus capacitor voltage circuit for the half-bridge power converter can have four states, namely: 1. the upper half capacitor voltage is higher than the lower half capacitor voltage, and the switch tube is conducted; 2. the upper half capacitor voltage is higher than the lower half capacitor voltage, and the switch tube is turned off; 3. the lower half capacitor voltage is higher than the upper half capacitor voltage, and the switch tube is conducted; 4. the lower half capacitor voltage is higher than the upper half capacitor voltage, and the switch tube is turned off. For the condition of voltage equalizing of the half-bridge bus voltage, the output power of auxiliary power supply is simultaneously provided by two primary windings, each energy storage passage provides half of the power, and redundant power of auxiliary power supply is fed back to the two groups of bus capacitors through the primary voltage equalizing diodes. At this time, there are two states: 5. the upper half capacitor voltage is equal to the lower half capacitor voltage, and when the switching tube is conducted; 6. the upper half capacitor voltage is equal to the lower half capacitor voltage, and the switch tube is turned off. These six states are described below in an ideal working situation.
State 1: the upper half capacitor voltage is higher than the lower half capacitor voltage, and the switch tube is conducted. The upper half bus capacitor C1, the diode D1, the switching tube S1 and the primary winding N1 form an energy storage passage. At this time, the voltage of the winding N1 is equal to the upper half bus capacitor voltage, and the voltages of the windings N2, N3 and N4 generate certain induction voltages according to the transformer transformation ratio relation, but no current flows through the windings due to the reverse cut-off of the diodes D2-D6. The current of the winding N1 rises linearly, the flyback transformer stores energy, and when the duty ratio of the switching tube reaches the maximum or the current of the winding N1 reaches the maximum peak value, the switching tube is turned off. This state is schematically shown in fig. 2 (a).
State 2: the upper half capacitor voltage is higher than the lower half capacitor voltage, and the switch tube is turned off. The lower half bus capacitor C2, the diode D3 and the primary winding N1 form an energy release path; the secondary winding N3, the secondary rectifying diode D5 and the secondary filter capacitor C3 form a group of auxiliary power supplies for power supply; the secondary winding N4, the secondary rectifying diode D6 and the secondary filter capacitor C4 form another group of auxiliary power supplies for power supply. At this time, the voltage of the winding N1 is equal to the voltage of the lower half bus capacitor, and the voltages of the windings N2, N3 and N4 generate certain induced voltages according to the transformer transformation ratio relation, but no current flows through the winding N2 due to the turn-off of the S2 and the reverse turn-off of the diode D4. The current of windings N1, N3 and N4 drops, the flyback transformer releases energy until the current drops to zero, the circuit is interrupted, and the switching tube is waited to be conducted. This state is schematically shown in fig. 2 (b).
State 3: the lower half capacitor voltage is higher than the upper half capacitor voltage, and the switch tube is conducted. The lower half bus capacitor C2, the diode D2, the switching tube S2 and the primary winding N2 form an energy storage passage. At this time, the voltage of the winding N2 is equal to the voltage of the lower half bus capacitor, and the voltages of the windings N1, N3 and N4 generate certain induction voltages according to the transformer transformation ratio relation, but the windings do not flow current due to reverse cut-off of the diodes D1, D3-D6. The current of the winding N2 rises linearly, the flyback transformer stores energy, and when the duty ratio of the switching tube reaches the maximum or the current of the winding N2 reaches the maximum peak value, the switching tube is turned off. This state is schematically shown in fig. 3 (a).
State 4: the lower half capacitor voltage is higher than the upper half capacitor voltage, and the switch tube is turned off. The upper half bus capacitor C1, the diode D4 and the primary winding N2 form an energy release path; the secondary winding N3, the secondary rectifying diode D5 and the secondary filter capacitor C3 form a group of auxiliary power supplies for power supply; the secondary winding N4, the secondary rectifying diode D6 and the secondary filter capacitor C4 form another group of auxiliary power supplies for power supply. At this time, the voltage of the winding N2 is equal to the upper half bus capacitor voltage, and the winding voltages of N1, N3 and N4 generate certain induction voltages according to the transformer transformation ratio relation, but no current flows through N1 due to the turn-off of S1 and the reverse turn-off of the diode D3. The current of windings N2, N3 and N4 drops, the flyback transformer releases energy until the current drops to zero, the circuit is interrupted, and the switching tube is waited to be conducted. This state is schematically shown in fig. 3 (b).
State 5: the upper half capacitor voltage is equal to the lower half capacitor voltage, and the switch tube is conducted. The lower half bus capacitor C2, the diode D3 and the primary winding N1, the upper half bus capacitor C1, the diode D1, the switching tube S1 and the primary winding N1, and the lower half bus capacitor C2, the diode D2, the switching tube S2 and the primary winding N2 form an energy storage passage. At this time, the voltages of windings N1 and N2 are equal to the bus capacitor voltage, and the voltages of windings N3 and N4 generate certain induced voltages according to the transformer transformation ratio relationship, but since the diodes D5 and D6 are turned off reversely, no current flows through these windings. The currents of the windings N1 and N2 rise linearly, the flyback transformer stores energy, and when the duty ratio of the switching tube reaches the maximum or the sum of the currents of the N1 and the N2 reaches the maximum peak value, the switching tube is turned off. This state is schematically shown in fig. 4 (a).
State 6: the upper half capacitor voltage is equal to the lower half capacitor voltage, and the switch tube is turned off. The lower half bus capacitor C2, the diode D3 and the primary winding N1, and the upper half bus capacitor C1, the diode D4 and the primary winding N2 form an energy release path at the same time; the secondary winding N3, the secondary rectifying diode D5 and the secondary filter capacitor C3 form a group of auxiliary power supplies for power supply; the secondary winding N4, the secondary rectifying diode D6 and the secondary filter capacitor C4 form another group of auxiliary power supplies for power supply. At this time, the voltages of windings N1 and N2 are equal to the bus capacitor voltage, and the voltages of windings N3 and N4 generate certain induced voltages according to the transformer transformation ratio relationship. The current of windings N1-N4 drops, the flyback transformer releases energy until the current drops to zero, the circuit is interrupted, and the switching tube is waited to be conducted. This state is schematically shown in fig. 4 (b).
In order to better illustrate the working state of the circuit, fig. 5 is a full-process simulation waveform diagram of the upper bus capacitor when the voltage is high, wherein states 1, 2, 5 and 6 are included, and waveforms of the lower bus capacitor when the voltage is high are similar and are not repeated. As can be seen from the graph, the voltage of the upper bus capacitor C1 is higher than the voltage of the lower bus capacitor C2 at the initial moment, and as the circuit works, the voltages of the two groups of bus capacitors approach to be consistent. Meanwhile, the voltage of the auxiliary power supply output capacitors C3 and C4 maintains a certain proportional relation with the bus voltage with lower voltage. As can be seen from the current waveform, when the bus voltage is uneven, the switching tube is conducted, and only the energy storage loop with high voltage works, as the current of the switching tube S1 in the figure rises; when the switching tube is turned off, only the energy release loop with low voltage works, and the current of the equalizing diode D3 in the figure generates current. When the bus voltages are consistent, the two loops of the circuit work simultaneously.
In circuit design, in order to ensure that the auxiliary power supply and bus capacitor voltage circuit for the half-bridge power converter can better realize the six different working states, the winding transformation ratio relation of the flyback transformer T should meet the requirement of N1:N2=1:1, and the design power of the flyback transformer should meet the requirement ofWherein Lp is the inductance of N1 and N2, ip is the peak current limit, f is the switching frequency of the converter, pc is the power required for equalization, and Po is the power required for auxiliary power supply.
The auxiliary power supply and the control mode of the bus capacitor voltage circuit for the half-bridge type power converter are peak current control of a duty ratio. Because the flyback converter of the scheme has a bus voltage equalizing function, the output voltage relationship is limited by turn ratio, and constant voltage control is not performed any more. The primary side peak current is set to be the maximum power that the transformer can bear, namely the sum of the bus balance power and the secondary side auxiliary power supply power. Meanwhile, the duty ratio is limited below 0.5, so that the switching tube can be actively turned off under the conditions of balanced power supply and smaller auxiliary power supply, and the release time of energy storage is provided; meanwhile, at high power output, the control complexity caused by subharmonic frequency oscillation of the generated switching frequency is reduced under the conditions of a peak current control mode and a high duty ratio.
According to the embodiment, the auxiliary power supply for supplying power to the control circuit in the power supply system is adopted, and the flyback transformer can store energy from the bus capacitor with higher voltage and release the energy to the bus capacitor with lower voltage in a winding voltage competing mode, so that the balance of the voltage of the bus capacitor is finally realized, and meanwhile, normal auxiliary power supply is not influenced. According to the technical scheme, the problem of half-bridge bus voltage balance is solved on the premise of not increasing the hardware cost and the control complexity of the system.
In addition, the capacitor voltage equalization is not only a problem to be solved by the half-bridge power converter, but also the serial connection of a capacitor or other energy storage element (such as a storage battery) is common in the occasions of a non-half-bridge circuit, high-voltage application, a bipolar direct current power supply system and the like, and the input or output serial connection of two power converters is common, and the equalization problem of the voltage of the input or output ends of the capacitor or energy storage element and the converter is also common in the occasions, so that the circuit of the invention can be applied to the occasions.
The embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by the embodiments, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (8)
1. A circuit for voltage equalizing and auxiliary power supply of a bus capacitor of a half-bridge power converter is characterized in that: the circuit comprises a first bus capacitor, a second bus capacitor, a first switching tube, a second switching tube, a first diode, a second diode, a first voltage-sharing diode, a second voltage-sharing diode, a flyback transformer and a current transformer; the flyback transformer is provided with two groups of primary windings and N groups of auxiliary power supply windings configured according to the auxiliary power supply requirement of the power converter, wherein N is more than or equal to 1; the positive pole of the first bus capacitor is connected with the positive pole of the power converter bus, the negative pole of the first bus capacitor is connected with the positive pole of the second bus capacitor and grounded, the negative pole of the second bus capacitor is connected with the negative pole of the power converter bus, the anode of the first diode is connected with the positive pole of the power converter bus, the cathode of the first diode is connected with the drain electrode of the first switch tube, the first end of the first group of primary windings of the flyback transformer is connected with the source electrode of the first switch tube and the cathode of the first voltage-sharing diode, the second end of the first group of primary windings of the flyback transformer is connected with the input end of the current transformer, the cathode of the second diode is connected with the negative pole of the power converter bus and the anode of the first voltage-sharing diode, the anode of the second diode is connected with the source electrode of the second switch tube, the first end of each auxiliary power supply winding of the flyback transformer and the first ends of the two groups of primary windings are the same name, each auxiliary power supply winding is provided with a rectifier diode and a filter capacitor, the first end of each auxiliary power supply winding is connected with the negative electrode of the filter capacitor, the second end of each auxiliary power supply winding is connected with the positive electrode of the rectifier diode, and the negative electrode of the rectifier diode is connected with the positive electrode of the filter capacitor;
the first bus capacitor, the first diode, the first switching tube and a first group of primary windings of the flyback transformer form an energy storage passage of an upper half bus of the power converter; the second bus capacitor, the second diode, the second switching tube and a second group of primary windings of the flyback transformer form an energy storage passage of a lower half bus of the power converter; the first bus capacitor, the second voltage-sharing diode and the second group of primary windings of the flyback transformer form an energy release passage of the upper half bus of the power converter; the second bus capacitor, the first voltage-sharing diode and the first group of primary windings of the flyback transformer form an energy release passage of the lower half bus of the power converter;
the first switching tube and the second switching tube adopt synchronous control working modes and are simultaneously turned on and turned off.
2. The circuit for voltage equalizing and auxiliary power supply of bus capacitor of half-bridge class power converter according to claim 1, wherein: the transformation ratio of the two groups of primary windings of the flyback transformer is 1:1.
3. the circuit for voltage equalizing and auxiliary power supply of bus capacitor of half-bridge class power converter according to claim 1, wherein: the ratio of the auxiliary power supply voltage provided by each group of auxiliary power supply windings to the voltage of the bus capacitor with the lower voltage of the two bus capacitors is equal to the turns ratio of the auxiliary power supply windings to the primary winding.
4. The circuit for voltage equalizing and auxiliary power supply of bus capacitor of half-bridge class power converter according to claim 1, wherein: and a primary voltage stabilizing circuit is arranged at the output end of each group of auxiliary power supply windings of the flyback transformer.
5. The circuit for voltage equalizing and auxiliary power supply of bus capacitor of half-bridge class power converter according to claim 1, wherein: when the first switch tube and the second switch tube are conducted, the energy storage channel corresponding to the capacitor with higher voltage in the two bus capacitors is conducted, and the energy storage channel corresponding to the capacitor with lower voltage is blocked by the reverse bias of the diode; when the first switch tube and the second switch tube are turned off, the energy release passage corresponding to the capacitor with lower voltage in the two bus capacitors is conducted, and the energy release passage corresponding to the capacitor with higher voltage is reversely blocked by the voltage equalizing diode.
6. The circuit for half-bridge class power converter bus capacitor voltage equalizing and auxiliary power supply of claim 5, wherein: when the first switch tube and the second switch tube are turned off, a rectifier diode on an auxiliary power supply winding of the flyback transformer is turned on to provide auxiliary current.
7. The circuit for half-bridge class power converter bus capacitor voltage equalizing and auxiliary power supply of claim 5, wherein: when the voltages of the first bus capacitor and the second bus capacitor are unequal, the capacitor with higher voltage provides auxiliary power supply energy, and provides balanced energy for the capacitor with lower voltage; when the voltages of the first bus capacitor and the second bus capacitor are equal, auxiliary power supply energy is provided by the first bus capacitor and the second bus capacitor in a balanced mode.
8. The circuit for voltage equalizing and auxiliary power supplying of bus capacitor of half-bridge class power converter according to any one of claims 1-7, wherein: the current of two groups of primary windings of the flyback transformer is detected through a current transformer, and a peak current control strategy limiting the maximum duty cycle is adopted, wherein the maximum duty cycle is limited to 0.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014599.7A CN109742927B (en) | 2019-01-08 | 2019-01-08 | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014599.7A CN109742927B (en) | 2019-01-08 | 2019-01-08 | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109742927A CN109742927A (en) | 2019-05-10 |
| CN109742927B true CN109742927B (en) | 2024-03-08 |
Family
ID=66363910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910014599.7A Active CN109742927B (en) | 2019-01-08 | 2019-01-08 | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109742927B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021061703A (en) * | 2019-10-08 | 2021-04-15 | シャープ株式会社 | Auxiliary power supply circuit, power supply device, and power supply circuit |
| US10917088B1 (en) | 2019-12-20 | 2021-02-09 | Suzhou Mean Well Technology Co., Ltd. | Power conversion device |
| CN110995010B (en) * | 2019-12-20 | 2022-05-10 | 明纬(广州)电子有限公司 | Power supply conversion device |
| CN112953231B (en) * | 2021-01-04 | 2022-08-12 | 河海大学 | Magnetic integration series type flyback circuit with half-bridge direct current bus capacitor voltage balancing capability |
| CN113612393B (en) * | 2021-08-30 | 2023-06-30 | 阳光电源股份有限公司 | Power supply circuit, direct current power supply and photovoltaic system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000060122A (en) * | 1998-08-13 | 2000-02-25 | Toshiba Corp | Power unit |
| EP1107438A2 (en) * | 1999-12-10 | 2001-06-13 | ABB Industry Oy | Balancing circuit for voltage division between capacitors |
| CN105577010A (en) * | 2015-12-30 | 2016-05-11 | 杭州禾迈电力电子技术有限公司 | Voltage-sharing and auxiliary power supply circuit for photovoltaic inverter and control method |
| CN209217936U (en) * | 2019-01-08 | 2019-08-06 | 南京麦格安倍电气科技有限公司 | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10879805B2 (en) * | 2015-09-22 | 2020-12-29 | Infineon Technologies Austria Ag | System and method for a switched-mode power supply having a transformer with a plurality of primary windings |
-
2019
- 2019-01-08 CN CN201910014599.7A patent/CN109742927B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000060122A (en) * | 1998-08-13 | 2000-02-25 | Toshiba Corp | Power unit |
| EP1107438A2 (en) * | 1999-12-10 | 2001-06-13 | ABB Industry Oy | Balancing circuit for voltage division between capacitors |
| CN105577010A (en) * | 2015-12-30 | 2016-05-11 | 杭州禾迈电力电子技术有限公司 | Voltage-sharing and auxiliary power supply circuit for photovoltaic inverter and control method |
| CN209217936U (en) * | 2019-01-08 | 2019-08-06 | 南京麦格安倍电气科技有限公司 | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109742927A (en) | 2019-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109742927B (en) | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter | |
| US10476397B2 (en) | Interleaved resonant converter | |
| CN111446861B (en) | DC/DC converter and control method thereof | |
| US20180351368A1 (en) | Electrical energy router and electrical energy router submodule | |
| CN108683347B (en) | Seven-level inverter topological structure based on voltage doubling circuit and seven-level inverter | |
| Arab Ansari et al. | Analysis and implementation of a new zero current switching flyback inverter | |
| CN110601544A (en) | Modular combined medium-voltage direct-current converter based on two-stage conversion structure and control method | |
| US20140192562A1 (en) | Single stage ac/dc converter | |
| CN112994499B (en) | Three-level half-bridge soft switch converter circuit, control system and control method thereof | |
| Nasiri et al. | A new driving method for a magnetron using a soft switching active clamp fly-back converter | |
| CN209217936U (en) | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor | |
| CN106655792B (en) | Asymmetric half-bridge flyback circuit | |
| CN112953231B (en) | Magnetic integration series type flyback circuit with half-bridge direct current bus capacitor voltage balancing capability | |
| WO2018196415A1 (en) | Solar dc converter, power supply control method, and air conditioner power supply system | |
| CN111682790B (en) | Double-input extended-gain multi-level inverter and control method thereof | |
| CN110572045B (en) | High-gain DC-DC converter based on double coupling inductors | |
| CN110061523B (en) | Multifunctional single-phase grid-connected inversion system and method with novel topological structure | |
| Wei et al. | LLC Resonant Converter Design Based on the Worst Operation Point | |
| Kejun et al. | Multi-Mode Control Based Current-Fed Full-Bridge DC-DC Converter for Electric Vehicles | |
| CN220985538U (en) | Wide-voltage input switching power supply | |
| EP4167453A1 (en) | Power converter | |
| CN217469760U (en) | PFC circuit module and LLC resonance control circuit | |
| CN111293868B (en) | Solid-state transformer and control method thereof | |
| CN103259444A (en) | Inverter power supply device | |
| KR102030918B1 (en) | High Efficiency EV Charger with Small Ripple Current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |