CN209217936U - It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor - Google Patents
It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor Download PDFInfo
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- CN209217936U CN209217936U CN201920024458.9U CN201920024458U CN209217936U CN 209217936 U CN209217936 U CN 209217936U CN 201920024458 U CN201920024458 U CN 201920024458U CN 209217936 U CN209217936 U CN 209217936U
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- auxiliary power
- bus capacitor
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Abstract
The utility model discloses press diode, second to be pressed to press diode, flyback transformer and current transformer with the circuit of auxiliary power supply, including the first bus capacitor, the second bus capacitor, first switch tube, second switch, first diode, the second diode, first for half-bridge class power inverter bus capacitor；The flyback transformer has two groups of primary side windings and requires the N group auxiliary power supply winding of configuration according to the auxiliary power supply of power inverter.The utility model realizes the equilibrium of bus capacitor voltage in such a way that voltage competes, while not influencing normal auxiliary power supply, under the premise of not increasing system hardware cost and control complexity, solves the problems, such as that half-bridge busbar voltage is balanced.
Description
Technical field
The utility model belongs to power electronic transformation field, in particular to is used for half-bridge class power inverter bus capacitor
Press the circuit with auxiliary power supply.
Background technique
Half-bridge class power inverter typically refers to connect to form the topological structure of half-bridge bus using two groups of capacitors, its conduct
Power electronic converts one of the basic topology in field, is widely used in all kinds of AC-DC, DC-DC and direct current-friendship
Among galvanic electricity source, such as half-bridge power factor corrector, three-level DC converter, neutral-point-clamped (NPC) inverter.But due to
The factors such as inconsistent, circuit control non complete symmetry of existing circuit parasitic parameter in practice bring two groups of bus capacitor electricity
Press uneven problem.And capacitance voltage unevenness can bring component voltage stress not wait, converter output power quality reduces very
The Balance route of a series of problems, such as to cisco unity malfunction, half-bridge class power inverter bus uniform voltage are real in academia and engineering
It is the problem of obtaining extensive concern in trampling.
The voltage balance control method of existing half-bridge class power inverter bus capacitor can be mainly divided into Hardware Method and
Two major class of Software Method.Hardware approach includes: that half-bridge bus capacitor is equal using two groups of voltage feds, the special capacitance voltage of increase
Weigh converter or balance of voltage device, increase in inverter output filter special designing filter introduce feedback power,
Neutral balance control etc. is carried out by capacitor voltage error feedfoward or modulating wave feedback etc. in hardware control circuit.The thinking of Software Method is big
It causes identical, i.e., is introduced into bus Balance route algorithm in PWM calculating, is rationally answered in the PWM Algorithm of three-level converter
Increase zero-sequence component etc. in small vector, three-phase inverter output.These methods perhaps increase circuit complexity or
The complexity for increasing control even can all cause certain negative the output characteristics of converter in terms of overall performance
It influences.
Utility model content
In order to solve the technical issues of above-mentioned background technique proposes, the utility model, which provides, is used for half-bridge class power inverter
Bus capacitor is pressed to be realized on the basis of not increasing hardware circuit and not improving control complexity with the circuit of auxiliary power supply
The bus uniform voltage of half-bridge class power inverter.
In order to achieve the above technical purposes, the technical solution of the utility model are as follows:
It is a kind of to be pressed and the circuit of auxiliary power supply, including the first bus electricity for half-bridge class power inverter bus capacitor
Appearance, the second bus capacitor, first switch tube, second switch, first diode, the second diode, first press diode,
Two press diode, flyback transformer and current transformer；The flyback transformer have two groups of primary side windings and
The N group auxiliary power supply winding of configuration, N >=1 are required according to the auxiliary power supply of power inverter；The anode connection of first bus capacitor
Power inverter bus anode, the cathode of the first bus capacitor connect anode and the ground connection of the second bus capacitor, the second bus electricity
The cathode of appearance connects power inverter bus cathode, and the anode connection power inverter bus of first diode is positive, and the one or two
The drain electrode of the cathode connection first switch tube of pole pipe, the first end connection first of first group of primary side winding of flyback transformer are opened
Close the source electrode of pipe and cathode that first presses diode, the second end of first group of primary side winding of flyback transformer connects electric current
The input terminal of mutual inductor, the cathode of the second diode connect power inverter bus cathode and first and press the anode of diode,
The source electrode of the anode connection second switch of second diode, the first end connection of second group of primary side winding of flyback transformer
The input terminal of current transformer, second group of primary side winding of flyback transformer second end connection first switch tube drain electrode and
Second presses the anode of diode, and second presses the anode of the cathode connection first diode of diode, flyback transformer
The first end of the first end of every group of auxiliary power supply winding and two groups of primary side windings Same Name of Ends each other is set on every group of auxiliary power supply winding
There are rectifier diode and filter capacitor, the cathode of the first end connection filter capacitor of every group of auxiliary power supply winding, every group of auxiliary supplies
The anode of the second end connection rectifier diode of electric winding, the anode of the cathode connection filter capacitor of rectifier diode.
Preferred embodiment based on the above-mentioned technical proposal, the no-load voltage ratio of two groups of primary side windings of flyback transformer are 1:1.
Preferred embodiment based on the above-mentioned technical proposal, the auxiliary power supply voltage and two mothers that every group of auxiliary power supply winding provides
The ratio of the lower bus capacitor voltage of voltage is equal to the turn ratio of this group of auxiliary power supply winding and primary side winding in line capacitance.
Preferred embodiment based on the above-mentioned technical proposal is set in the output end of every group of auxiliary power supply winding of flyback transformer
Set level-one voltage regulator circuit.
Preferred embodiment based on the above-mentioned technical proposal, the voltage regulator circuit are linear voltage-stabilizing circuit or reduction voltage circuit.
Preferred embodiment based on the above-mentioned technical proposal, the first bus capacitor, first diode, first switch tube and inverse-excitation type
The energy storage access of first group of primary side winding composition power inverter upper half bus of transformer；Second bus capacitor, the two or two pole
The energy storage access of second group of primary side winding composition power inverter lower half bus of pipe, second switch and flyback transformer；
First bus capacitor, second press second group of primary side winding of diode and flyback transformer composition power inverter upper half female
Releasing for line can access；Second bus capacitor, first press the success of first group of primary side winding group of diode and flyback transformer
Releasing for rate converter lower half bus can access.
By adopting the above technical scheme bring the utility model has the advantages that
(1) the utility model uses in a power-supply system as the accessory power supply of control circuit power supply, is competed by voltage
Mode, realize the equilibrium of bus capacitor voltage, while not influencing normal auxiliary power supply, do not increase system hardware cost and
Under the premise of controlling complexity, solve the problems, such as that half-bridge busbar voltage is balanced.
(2) the utility model due to eliminating traditional equalizing resistance, auxiliary power be taken from the high capacitor of voltage, equilibrium
Energy does not need to avoid leakage inductance loss by winding coupled, realizes that energy loss attached by electric voltage equalization is small, high-efficient.
(3) auxiliary power supply voltage size reflects the voltage of the lower bus capacitor of voltage in the utility model, when two
When the pressure difference of bus capacitor is excessive, accessory power supply voltage will be lower, and therefore, which can also realize bus capacitor voltage automatically
The excessive protection of pressure difference, so can reducer control circuit.
Detailed description of the invention
Fig. 1 is the circuit topology figure of embodiment median generatrix capacitor voltage equalizing and auxiliary power supply；
Fig. 2 is operation mode schematic diagram when upper half bus capacitor voltage is higher in embodiment, is included (a), (b) two width
Figure respectively indicates switching tube S1 and S2 conducting and switching tube S1 and S2 conducting shutdown；
Fig. 3 is operation mode schematic diagram when lower half bus capacitor voltage is higher in embodiment, is included (a), (b) two width
Figure respectively indicates switching tube S1 and S2 conducting and switching tube S1 and S2 conducting shutdown；
Fig. 4 is operation mode schematic diagram when embodiment median generatrix capacitance voltage is identical, is included (a), (b) two width subgraph,
Respectively indicate switching tube S1 and S2 conducting and switching tube S1 and S2 conducting shutdown；
Fig. 5 is whole process simulation waveform diagram when upper half bus capacitor voltage is higher in embodiment.
Specific embodiment
Below with reference to attached drawing, the technical solution of the utility model is described in detail.
Circuit topology that the present embodiment uses as shown in Figure 1, power input for two groups of half-bridges bus capacitor C1 and C2, flyback
Formula transformer T primary side is equipped with switching tube S1 and S2, diode D1 and D2, pressure diode D3 and D4 and current transformer
CT.Flyback transformer T pair side is auxiliary power supply output, can be required to can provide multiple groups pair according to the auxiliary power supply of power-supply system
Side, the present embodiment are illustrated using two groups of pair sides, every group of pair rectifier diode D5, D6 and one when including a pair
Secondary side filter capacitor C3, C4.
Auxiliary power supply and bus capacitor electricity for the situation of half-bridge busbar voltage unevenness, for half-bridge class power inverter
Volt circuit can have four kinds of states, be respectively: 1, upper half capacitance voltage is higher than lower half capacitance voltage, and when switching tube conducting；
2, upper half capacitance voltage is higher than lower half capacitance voltage, and when switching tube shutdown；3, lower half capacitance voltage is higher than upper half capacitance voltage,
And when switching tube conducting；4, lower half capacitance voltage is higher than upper half capacitance voltage, and when switching tube shutdown.For half-bridge busbar voltage
The case where pressing, the output power of auxiliary power supply is provided simultaneously by two primary side windings, and each energy storage access provides the one of power
Half, the extra power of auxiliary power supply presses diode to be fed back to two groups of bus capacitors by primary side.There are two states at this time: 5,
Upper half capacitance voltage is equal to lower half capacitance voltage, and when switching tube conducting；6, upper half capacitance voltage is equal to lower half capacitance voltage, and
When switching tube turns off.Below under ideal working condition, this six kinds of states are illustrated.
State 1: upper half capacitance voltage is higher than lower half capacitance voltage, and when switching tube conducting.Upper half bus capacitor C1, two poles
Pipe D1, switching tube S1 and primary side winding N1 form energy storage access.The voltage of winding N1 is equal to upper half bus capacitor voltage at this time,
N2, N3, N4 winding voltage generate certain induced voltage according to transformer voltage ratio relationship, but since D2~D6 diode is reversely cut
Only, these windings are all flowed through without electric current.Winding N1 electric current linear rise, flyback transformer energy storage, when switching tube duty ratio
Reach maximum or when N1 electric current reaches peak-peak, switching tube shutdown.Shown in (a) in the status diagram such as Fig. 2.
State 2: upper half capacitance voltage is higher than lower half capacitance voltage, and when switching tube shutdown.Lower half bus capacitor C2, two poles
Pipe D3 and primary side winding N1 formation is released can access；Vice-side winding N3 and the secondary filter capacitor C3 in rectifier diode D5, pair are formed
One group of accessory power supply power supply；Vice-side winding N4 and the secondary filter capacitor C4 in rectifier diode D6, pair form another group of auxiliary electricity
Source power supply.The voltage of winding N1 is equal to lower half bus capacitor voltage at this time, and N2, N3, N4 winding voltage are closed according to transformer voltage ratio
System generates certain induced voltage, but since S2 shutdown, D4 diode reversely end, N2 does not have electric current to flow through.Winding N1, N3,
The decline of N4 electric current, flyback transformer release energy, enter discontinuously until electric current drops to zero circuit, switching tube is waited to be connected herein.
Shown in (b) in the status diagram such as Fig. 2.
State 3: lower half capacitance voltage is higher than upper half capacitance voltage, and when switching tube conducting.Lower half bus capacitor C2, two poles
Pipe D2, switching tube S2 and primary side winding N2 form energy storage access.The voltage of winding N2 is equal to lower half bus capacitor voltage at this time,
N1, N3, N4 winding voltage generate certain induced voltage according to transformer voltage ratio relationship, but since D1, D3~D6 diode are anti-
To cut-off, these windings are all flowed through without electric current.Winding N2 electric current linear rise, flyback transformer energy storage, when switching tube accounts for
Sky is than reaching maximum or when N2 electric current reaches peak-peak, switching tube shutdown.Shown in (a) in the status diagram such as Fig. 3.
State 4: lower half capacitance voltage is higher than upper half capacitance voltage, and when switching tube shutdown.Upper half bus capacitor C1, two poles
Pipe D4 and primary side winding N2 formation is released can access；Vice-side winding N3 and the secondary filter capacitor C3 in rectifier diode D5, pair are formed
One group of accessory power supply power supply；Vice-side winding N4 and the secondary filter capacitor C4 in rectifier diode D6, pair form another group of auxiliary electricity
Source power supply.The voltage of winding N2 is equal to upper half bus capacitor voltage at this time, and N1, N3, N4 winding voltage are closed according to transformer voltage ratio
System generates certain induced voltage, but since S1 shutdown, D3 diode reversely end, N1 does not have electric current to flow through.Winding N2, N3,
The decline of N4 electric current, flyback transformer release energy, enter discontinuously until electric current drops to zero circuit, switching tube is waited to be connected herein.
Shown in (b) in the status diagram such as Fig. 3.
State 5: upper half capacitance voltage is equal to lower half capacitance voltage, and when switching tube conducting.Lower half bus capacitor C2, two poles
Pipe D3 and primary side winding N1, upper half bus capacitor C1, diode D1, switching tube S1 and primary side winding N1 and lower half bus electricity
Hold C2, diode D2, switching tube S2 and primary side winding N2, is formed simultaneously energy storage access.The voltage of winding N1, N2 is equal to mother at this time
Line capacitance voltage, N3, N4 winding voltage generate certain induced voltage according to transformer voltage ratio relationship, but due to bis- pole D5, D6
The reversed cut-off of pipe, these windings are all flowed through without electric current.Winding N1, N2 electric current linear rise, flyback transformer energy storage, when opening
Close that pipe duty ratio reaches maximum or when the sum of N1 and N2 electric current reach peak-peak, switching tube is turned off.The status diagram is such as
Shown in (a) in Fig. 4.
State 6: upper half capacitance voltage is equal to lower half capacitance voltage, and when switching tube shutdown.Lower half bus capacitor C2, two poles
Pipe D3 and primary side winding N1 and upper half bus capacitor C1, diode D4 and primary side winding N2 are formed simultaneously and release energy access；It is secondary
In winding N3 and pair, rectifier diode D5, pair side filter capacitor C3 form one group of accessory power supply and power；Vice-side winding N4 and pair
Filter capacitor C4 forms another group of accessory power supply power supply while rectifier diode D6, secondary.The voltage of winding N1, N2 is equal to mother at this time
Line capacitance voltage, N3, N4 winding voltage generate certain induced voltage according to transformer voltage ratio relationship.Under winding N1~N4 electric current
Drop, flyback transformer release energy, enter discontinuously until electric current drops to zero circuit, switching tube is waited to be connected herein.The state is shown
It is intended to as shown in (b) in Fig. 4.
In order to which the working condition of circuit is better described, Fig. 5 is whole process simulation wave when Up Highway UHW capacitance voltage is higher
Shape figure, wherein containing state 1,2,5,6, waveform when Down Highway capacitance voltage is higher is similar, is not repeated.It can be seen by figure
Out, initial time Up Highway UHW capacitance voltage C1 is higher than Down Highway capacitor C2 voltage, with the work of circuit, two groups of bus capacitor electricity
Pressure approach is consistent.The voltage of auxiliary power supply output capacitance C3 and C4 and the lower busbar voltage of voltage maintain certain ratio simultaneously
Relationship.It can be seen that from current waveform, when busbar voltage unevenness, the high tank circuit work of switching tube conducting, only voltage, such as
Switching tube S1 electric current in figure rises；When switching tube turns off, what only voltage was low releases energy loop works, such as two pole of pressure in figure
Pipe D3 electric current generates electric current.When busbar voltage is consistent, two circuits of circuit are worked at the same time.
When carrying out circuit design, in order to guarantee auxiliary power supply and bus capacitor voltage for half-bridge class power inverter
Circuit can preferably realize that above-mentioned six kinds of different working conditions, the winding no-load voltage ratio relationship of flyback transformer T should meet N1:
The design power of N2=1:1, flyback transformer should meetWherein Lp is the inductance inductance value of N1 and N2,
Ip is peak current limit, and f is the switching frequency of converter, and Pc is balanced required power, and Po is that power supply station is assisted to need
Power.
It is limited duty ratio for the auxiliary power supply of half-bridge class power inverter and the control mode of bus capacitor potential circuit
Peak value comparison method.Since the inverse excitation type converter of this programme has bus uniform voltage function, output voltage relationship is limited by the turn ratio
System, no longer progress Isobarically Control.Primary side peak point current is set as the maximum power that transformer is able to bear, i.e. bus equal power
The sum of with secondary side auxiliary power supply power.Simultaneously by duty-cycle limit 0.5 hereinafter, can be in power supply equalization and auxiliary power supply power
In lesser situation, active on-off switching tube provides the release time of energy storage；Simultaneously in high-power output, reduce peak value electricity
In the case of flow control mode and high duty ratio, control brought by the subfrequency oscillation of generated switching frequency is complicated
Property.
It uses in a power-supply system as the accessory power supply of control circuit power supply, passes through it can be seen from the above embodiments that
The mode of winding voltage competition, flyback transformer can store energy from the higher bus capacitor of voltage, and be released to electricity
Lower bus capacitor is pressed, the final equilibrium for realizing bus capacitor voltage, while normal auxiliary power supply is not influenced.The technical side
Case solves the problems, such as that half-bridge busbar voltage is balanced under the premise of not increasing system hardware cost and control complexity.
In addition, capacitance voltage equilibrium is not only to solve the problems, such as required for half-bridge class power inverter, in non-half-bridge class
The series connection of the occasions such as circuit, high voltage applications, bipolar system DC power-supply system, capacitor or other energy-storage travelling wave tubes (such as battery) is answered
Be also it is generally existing, the input of two power inverters or output are connected in series also very common, equally exist in these occasions
The equalization problem of capacitor or energy-storage travelling wave tube, converter input or output end voltage, the circuit of the utility model can be equally applicable in
In these occasions.
Embodiment is only to illustrate the technical idea of the utility model, and protection scope of this utility model cannot be limited by this,
It is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within practical
Within the scope of novel protected.
Claims (6)
1. a kind of press and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor, it is characterised in that: the circuit
Including the first bus capacitor, the second bus capacitor, first switch tube, second switch, first diode, the second diode,
One presses diode, second to press diode, flyback transformer and current transformer；The flyback transformer has two
Group primary side winding and the N group auxiliary power supply winding that configuration is required according to the auxiliary power supply of power inverter, N >=1；First bus
The anode connection power inverter bus anode of capacitor, the cathode of the first bus capacitor connect the anode of the second bus capacitor and connect
Ground, the cathode of the second bus capacitor connect power inverter bus cathode, and the anode connection power inverter of first diode is female
Line anode, the drain electrode of the cathode connection first switch tube of first diode, the of first group of primary side winding of flyback transformer
One end connect first switch tube source electrode and first press diode cathode, first group of primary side winding of flyback transformer
Second end connects the input terminal of current transformer, and the cathode connection power inverter bus cathode and first of the second diode is pressed
The anode of diode, the source electrode of the anode connection second switch of the second diode, second group of primary side of flyback transformer around
The input terminal of the first end connection current transformer of group, the second end connection first of second group of primary side winding of flyback transformer
The anode that the drain electrode of switching tube presses diode with second, second presses the anode of the cathode connection first diode of diode,
The first end of the first end of every group of auxiliary power supply winding of flyback transformer and two groups of primary side windings Same Name of Ends each other, every group auxiliary
Power supply winding is helped to be equipped with rectifier diode and filter capacitor, the first end connection filter capacitor of every group of auxiliary power supply winding is born
Pole, the anode of the second end connection rectifier diode of every group of auxiliary power supply winding, the cathode of rectifier diode connect filter capacitor
Anode.
2. being pressed and the circuit of auxiliary power supply, spy for half-bridge class power inverter bus capacitor according to claim 1
Sign is: the no-load voltage ratio of two groups of primary side windings of flyback transformer is 1:1.
3. being pressed and the circuit of auxiliary power supply, spy for half-bridge class power inverter bus capacitor according to claim 1
Sign is: the auxiliary power supply voltage that every group of auxiliary power supply winding provides and the lower bus capacitor electricity of voltage in two bus capacitors
The ratio of pressure is equal to the turn ratio of this group of auxiliary power supply winding and primary side winding.
4. being pressed and the circuit of auxiliary power supply, spy for half-bridge class power inverter bus capacitor according to claim 1
Sign is: level-one voltage regulator circuit is arranged in the output end of every group of auxiliary power supply winding of flyback transformer.
5. being pressed and the circuit of auxiliary power supply, spy for half-bridge class power inverter bus capacitor according to claim 4
Sign is: the voltage regulator circuit is linear voltage-stabilizing circuit or reduction voltage circuit.
6. being pressed and auxiliary power supply described in any one of -5 for half-bridge class power inverter bus capacitor according to claim 1
Circuit, it is characterised in that: the first bus capacitor, first diode, first group of first switch tube and flyback transformer it is former
The energy storage access of side winding composition power inverter upper half bus；Second bus capacitor, the second diode, second switch and anti-
Swash the energy storage access of second group of primary side winding composition power inverter lower half bus of formula transformer；First bus capacitor, second
Press releasing for second group of primary side winding of diode and flyback transformer composition power inverter upper half bus can access；Second
Bus capacitor, first press first group of primary side winding of diode and flyback transformer composition power inverter lower half bus
Releasing can access.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920024458.9U CN209217936U (en) | 2019-01-08 | 2019-01-08 | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920024458.9U CN209217936U (en) | 2019-01-08 | 2019-01-08 | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor |
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| CN209217936U true CN209217936U (en) | 2019-08-06 |
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ID=67467056
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920024458.9U Active CN209217936U (en) | 2019-01-08 | 2019-01-08 | It is pressed and the circuit of auxiliary power supply for half-bridge class power inverter bus capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742927A (en) * | 2019-01-08 | 2019-05-10 | 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 |
| CN112134296A (en) * | 2020-09-16 | 2020-12-25 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
-
2019
- 2019-01-08 CN CN201920024458.9U patent/CN209217936U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742927A (en) * | 2019-01-08 | 2019-05-10 | 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 |
| CN109742927B (en) * | 2019-01-08 | 2024-03-08 | 南京麦格安倍电气科技有限公司 | Circuit for equalizing voltage and auxiliary power supply of bus capacitor of half-bridge power converter |
| CN112134296A (en) * | 2020-09-16 | 2020-12-25 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
| CN112134296B (en) * | 2020-09-16 | 2022-03-11 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
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