CN206498322U - A kind of hf switching power supply absorbed with leakage inductance peak voltage - Google Patents
A kind of hf switching power supply absorbed with leakage inductance peak voltage Download PDFInfo
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- CN206498322U CN206498322U CN201621382387.2U CN201621382387U CN206498322U CN 206498322 U CN206498322 U CN 206498322U CN 201621382387 U CN201621382387 U CN 201621382387U CN 206498322 U CN206498322 U CN 206498322U
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Abstract
The utility model is a kind of hf switching power supply absorbed with leakage inductance peak voltage, including input filter circuit, high-frequency switch circuit, output filter circuit and leakage inductance peak voltage absorbing circuit.The utility model provides a kind of leakage inductance peak voltage absorbing circuit and obtains DC voltage to the peak voltage progress rectifying and wave-filtering of the leakage inductance generation of primary winding, and the DC voltage is added on voltage HV, one side benefit is that the Energy Efficient of the peak voltage is converted into input energy, another aspect benefit is loss very little of the peak voltage to component D2, D4, R3, R4, C2 in current rectifying and wave filtering circuit, and component generates heat also with regard to very little.
Description
Technical field
The utility model is related to a kind of hf switching power supply absorbed with leakage inductance peak voltage.
Background technology
In high frequency switch power, the leakage inductance of the secondary windings of high frequency transformer and the parasitic capacitance composition LC of switching tube are humorous
Shake loop, when switching tube is turned off, and this LC resonant tank will produce vibration spike high pressure, and on the one hand spike high pressure results in the need for
The higher pressure-resistant switching tube of selection, but the internal resistance R of the switching tube of high pressureDSAlso it can increase, so that conduction loss also can be therewith
Increase.On the other hand higher peak voltage can make input produce higher electromagnetic interference, cause input EMC circuits more complicated.Institute
Peak voltage absorbing circuit must be added to the secondary windings of high frequency transformer, to eliminate a part of peak voltage.In leakage inductance point
In peak voltage absorpting circuit, generally using RCD (resistance, electric capacity, diode) absorbing circuits and active clamp circuit, opened with eliminating
The leakage inductance peak voltage that produces when closing pipe shut-off, also just its pressure voltage can be reduced so when choosing switching tube, and switching tube is led
Logical loss can also reduce therewith, and the complexity of input EMC circuits equally reduces therewith.
Now widely used leakage inductance peak voltage absorbing circuit is wherein the most frequently used shown in Fig. 1 as shown in Figure 1 and Figure 2
It is that simplest RCD absorbs leakage inductance peak voltage circuit, but has the disadvantage that leakage inductance peak voltage can only be absorbed sub-fraction, and
The consumption completely of the peak voltage energy of absorption causes component to generate heat in itself liter on R2, R11, C1, C6, D8, D7 component
It is high.It is the best active clamp leakage inductance peak voltage absorbing circuit of effect shown in Fig. 2, but has the disadvantage to use switching tube, cost increases
Greatly, and switching tube Q5 be in high end trim, it is impossible to directly drive, need to be coupled to by inductance T4 it is high-end be driven Q5, i.e.,
Q5 drive circuit is more complicated.
Or these absorb peak voltage with traditional high-frequency power supply circuit with leakage inductance peak voltage absorbing circuit
Undesirable and loss is big, otherwise circuit cost is high and drive circuit is more complicated.
Utility model content
In order to overcome traditional high-frequency power supply circuit with the absorption of leakage inductance peak voltage to absorb undesirable to peak voltage
Or circuit is more complicated, the utility model provides a kind of hf switching power supply absorbed with leakage inductance peak voltage.
The technical scheme that the utility model is used is：A kind of high frequency switch power electricity absorbed with leakage inductance peak voltage
Road, including input filter circuit, high-frequency switch circuit, output filter circuit and leakage inductance peak voltage absorbing circuit, input AC
After power supply is filtered by input filter circuit, direct current is exported through high-frequency switch circuit rectification and output filter circuit；Its feature
It is that described leakage inductance peak voltage absorbing circuit includes commutation diode D2 and commutation diode D4, resistance R3 and resistance R4,
Filter capacitor C2；Commutation diode D4 anode connects 1 pin of transformer T1 primary coils, commutation diode D4 negative electrode connecting resistance
R4 one end, the resistance R4 other end passes through filter capacitor C2 connecting resistances R2 one end, resistance R2 another pole of termination rectification two
Pipe D2 anode, commutation diode D2 negative electrode connects 2 pin of transformer T1 primary coils；Resistance R4 and electric capacity C2 connection is terminated
High pressure (HV), resistance R2 and electric capacity C2 connection end is grounded.
The utility model provides the point that a kind of leakage inductance peak voltage absorbing circuit is produced to the leakage inductance of primary winding
Peak voltage carries out rectifying and wave-filtering and obtains DC voltage, and the DC voltage is added on voltage HV, and one side benefit is this
The Energy Efficient of peak voltage is converted into input energy, and another aspect benefit is peak voltage to the member in current rectifying and wave filtering circuit
Device D2, D4, R3, R4, C2 loss very little, component generate heat also with regard to very little.
Further, in the above-mentioned hf switching power supply absorbed with leakage inductance peak voltage：Described filter circuit
Including filter capacitor and diode, described filter capacitor is made up of electrochemical capacitor E1 and electrochemical capacitor E3 series windings；Input high pressure
DC voltage VinFirst after filtered capacitor filtering, HVDC HV is then obtained by diode D1.
Further, in the above-mentioned hf switching power supply absorbed with leakage inductance peak voltage：Described HF switch
Circuit includes metal-oxide-semiconductor Q1, the pin armature winding of metal-oxide-semiconductor Q2, the 1 of transformer T1,2；Synchronous PWM1 signals and PWM2 signals；
HVDC HV signals connect metal-oxide-semiconductor Q1 source electrodes, and metal-oxide-semiconductor Q1, which drains, connects 2 pin of transformer T1 armature windings, transformer
1 pin of T1 armature windings connects metal-oxide-semiconductor Q2 source electrodes, metal-oxide-semiconductor Q1 grounded drains (PGND)；
PWM1 signals and PWM2 connect metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 grid, metal-oxide-semiconductor Q1 grid and the Indirect Electro of drain electrode respectively
Hinder R1, metal-oxide-semiconductor Q2 grid and the indirect resistance R5 of drain electrode.
Further, in the above-mentioned hf switching power supply absorbed with leakage inductance peak voltage：Described output filtering
Circuit is arranged on transformer T13,4 pin secondary windings ends, including commutation diode D3, electrolytic capacitor filter E2, transformer T1 times
The level pin of winding 3 connects commutation diode D3 anode, and the anode that commutation diode D3 negative electrode meets electrolytic capacitor filter E2 forms flat
Sliding DC voltage Vout, electrolytic capacitor filter E2 negative electrode connects the pin of transformer T1 secondary windings 4 and ground.
Below with reference to drawings and examples, the utility model is described in detail.
Brief description of the drawings
Fig. 1, it is that RCD of the prior art absorbs leakage inductance peak voltage circuit theory diagrams.
Fig. 2, it is active clamp absorption leakage inductance peak voltage circuit theory diagrams of the prior art.
Fig. 3, it is leakage inductance peak voltage absorbing circuit schematic diagram of the present utility model.
Fig. 4 a and Fig. 4 b, it is Vin=400Vdc, Vout=12Vdc, IoutIt is Fig. 1 and Fig. 3 circuit respectively under the conditions of=7A
The switching tube DS waveforms measured.
Fig. 5 a and Fig. 5 b, it is Vin=650Vdc, Vout=12Vdc, IoutIt is Fig. 1 and Fig. 3 circuit respectively under the conditions of=7A
The switching tube DS waveforms measured.
Fig. 6 a and Fig. 6 b, it is Vin=850Vdc, Vout=12Vdc, IoutIt is Fig. 1 and Fig. 3 circuit respectively under the conditions of=7A
The switching tube DS waveforms measured.
Embodiment
The present embodiment is that a kind of band leakage inductance peak voltage absorbs hf switching power supply, leakage inductance peak voltage absorbing circuit
The peak voltage that the leakage inductance of 1, the 2 pin armature windings to transformer T1 is produced carries out rectifying and wave-filtering, hf switching power supply bag
Include input filter circuit, high-frequency switch circuit, output filter circuit and leakage inductance peak voltage absorbing circuit.Leakage inductance peak voltage is inhaled
Receive circuit and the peak voltage that the leakage inductance of the 1 of transformer T1,2 pin armature windings is produced is connect into commutation diode D2 and commutation diode
D4, it is rectified after be transported to the resistance R3 and resistance R4 for suppressing dash current, then DC voltage is filtered into by electric capacity C2, so
After be added on voltage HV.
In the present embodiment, as shown in figure 3, what leakage inductance peak voltage absorbing circuit was produced to the leakage inductance of primary winding
Peak voltage carries out rectifying and wave-filtering and obtains DC voltage as a part for input, including high-frequency switch circuit, in addition to two poles
Pipe, resistance, the current rectifying and wave filtering circuit of electric capacity composition；Described DC input voitage VinDescribed switching tube Q1 D poles are connect respectively
With filter capacitor C3, described rectification circuit D2 negative pole connects Q1 S poles, and D4 positive pole connects Q2 D poles, described output Vout
For DC voltage.
Rectifying and wave-filtering is carried out to the peak voltage that the leakage inductance of primary winding is produced in the present embodiment and obtains direct current
Pressure, and is added to the DC voltage on voltage HV, and one side benefit is that being converted into for the Energy Efficient of the peak voltage is defeated
Enter energy, another aspect benefit is peak voltage to the loss of component D2, D4, R3, R4, C2 in current rectifying and wave filtering circuit very
Small, component generates heat also with regard to very little.
In the present embodiment, input filter circuit includes E1, E2；HVDC input voltage VinThrough E1 and E2 series filterings
Afterwards, switching tube Q1 D poles are then transported to by diode D1.
High-frequency switch circuit includes switching tube Q1, Q2.Q1, Q2 make in PWM1, PWM2 high frequency ON/OFF drive signal respectively
Under, HVDC HV is applied in the 1 of T1,2 secondary windings, and stores energy in winding.
Output filter circuit includes D3, E2.Output filter circuit is after T1 secondary windings senses pulse voltage, to lead to
Diode D3 rectifications are crossed, then direct current is filtered into through electrochemical capacitor E2, load is available to.
As shown in figure 3, the circuit of the present embodiment includes four parts.
Part I is made up of input filter circuit E1, E2.
Input high-voltage dc voltage VinFirst after E1 and E2 series filterings, HVDC is then obtained by diode D1
HV, HVDC HV connect switching tube Q1 D poles.
Part II circuit is made up of two MOS switch pipes and primary winding, it is therefore an objective to which the 1 of T1,2 pin are primary
3,4 pin secondary windings of the winding energy isolation coupling to T1.So as to obtain the high-frequency ac voltage of T1 3,4 pin.
High-frequency switch circuit includes MOS switch pipe Q1, the pin armature winding of Q2, the 1 of transformer T1,2；As drive signal PWM1
When being high level simultaneously with PWM2, Q1, Q2 are simultaneously turned on, and HVDC HV is applied to the 1 of T1,2 secondary windings, and in winding storage
Deposit energy；When drive signal PWM1 and PWM2 is simultaneously low level, Q1, Q2 end simultaneously, T1 1,2 secondary windings release energy
Measure and isolation coupling to T1 3,4 pin secondary windings and obtain high-frequency ac voltage.
Part III circuit is made up of output filter circuit, it is therefore an objective to by the high-frequency ac voltage rectification of the 3 of T1,4 pin and
It is filtered into DC voltage Vout。
Output filter circuit includes commutation diode D3, electrolytic capacitor filter E2.The high-frequency ac voltage warp of T1 3,4 pin
D3 is rectified into unipolarity square-wave voltage, and unipolarity square-wave voltage is filtered into smooth direct current in the presence of electrochemical capacitor E2
Voltage Vout, then stable direct current is provided to load.
Part IV circuit is made up of leakage inductance peak voltage absorbing circuit, it is therefore an objective to which the peak voltage of the 1 of T1,2 pin is whole
Flow and be filtered into DC voltage.
Leakage inductance peak voltage absorbing circuit includes commutation diode D2 and D4, suppresses dash current resistance R3 and R4, filtering
Electric capacity C2；Because the leakage inductance L of T1 1,2 pin windings and Q1, Q2 parasitic capacitance C constitute LC resonant tanks, when switching tube Q1, Q2 are closed
When disconnected, higher peak voltage can be produced in T1 1,2 pin windings, this peak voltage is rectified into unipolarity through diode D2 and D4
Pulse voltage, and unipolar pulse voltage is filtered into smooth DC voltage and the high pressure HV that is added in the presence of electric capacity C2
On, provide sub-fraction storage energy as the sub-fraction of DC input voitage, and when switching tube turns on for transformer.
Fig. 4,5,6 show the visible spike of switching tube DS waveforms measured under the same terms and significantly reduced.
Claims (4)
1. it is a kind of with leakage inductance peak voltage absorb hf switching power supply, including input filter circuit, high-frequency switch circuit,
Output filter circuit and leakage inductance peak voltage absorbing circuit, after input ac power is filtered by input filter circuit, through height
Frequency switching circuit rectification and output filter circuit output direct current；It is characterized in that：Described leakage inductance peak voltage absorbing circuit bag
Include commutation diode D2 and commutation diode D4, resistance R3 and resistance R4, filter capacitor C2；Commutation diode D4 anode connects change
1 pin of depressor T1 primary coils, commutation diode D4 negative electrode connecting resistance R4 one end, the resistance R4 other end passes through filtered electrical
Hold C2 connecting resistances R2 one end, resistance R2 another termination commutation diode D2 anode, commutation diode D2 negative electrode connects change
2 pin of depressor T1 primary coils；Resistance R4 and electric capacity C2 connection terminated high voltage HV, resistance R2 and electric capacity C2 connection end are grounded
PGND。
2. the hf switching power supply according to claim 1 absorbed with leakage inductance peak voltage, it is characterised in that：It is described
Filter circuit include filter capacitor and diode, described filter capacitor is by electrochemical capacitor E1 and electrochemical capacitor E3 series winding groups
Into；Input high-voltage dc voltage VinFirst after filtered capacitor filtering, high pressure HV is then obtained by diode D1.
3. the hf switching power supply according to claim 2 absorbed with leakage inductance peak voltage, it is characterised in that：It is described
High-frequency switch circuit include metal-oxide-semiconductor Q1, the pin armature winding of metal-oxide-semiconductor Q2, the 1 of transformer T1,2；Synchronous PWM1 signals and
PWM2 signals；
High pressure HV connects metal-oxide-semiconductor Q1 source electrodes, and metal-oxide-semiconductor Q1, which drains, connects 2 pin of transformer T1 armature windings, transformer T1 armature windings
1 pin connects metal-oxide-semiconductor Q2 source electrodes, metal-oxide-semiconductor Q1 grounded drains PGND；
PWM1 signals and PWM2 connect metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 grid, metal-oxide-semiconductor Q1 grid and the indirect resistance of drain electrode respectively
R1, metal-oxide-semiconductor Q2 grid and the indirect resistance R5 of drain electrode.
4. the hf switching power supply absorbed with leakage inductance peak voltage according to claim 1 or 2 or 3, its feature exists
In：Described output filter circuit is arranged on transformer T13,4 pin secondary windings ends, including commutation diode D3, filtering electrolysis
The pin of electric capacity E2, transformer T1 secondary windings 3 connects commutation diode D3 anode, and commutation diode D3 negative electrode connects filtering electrolysis electricity
The anode for holding E2 forms smooth DC voltage Vout, electrolytic capacitor filter E2 negative electrode connect the pin of transformer T1 secondary windings 4 and
Ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621382387.2U CN206498322U (en) | 2016-12-16 | 2016-12-16 | A kind of hf switching power supply absorbed with leakage inductance peak voltage |
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|---|---|---|---|
| CN201621382387.2U CN206498322U (en) | 2016-12-16 | 2016-12-16 | A kind of hf switching power supply absorbed with leakage inductance peak voltage |
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| CN206498322U true CN206498322U (en) | 2017-09-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786559A (en) * | 2019-04-03 | 2020-10-16 | 深圳市正弦电气股份有限公司 | Double-tube flyback power circuit |
| CN113740597A (en) * | 2020-09-08 | 2021-12-03 | 台达电子企业管理（上海）有限公司 | Switch tube peak voltage detection circuit and method |
-
2016
- 2016-12-16 CN CN201621382387.2U patent/CN206498322U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786559A (en) * | 2019-04-03 | 2020-10-16 | 深圳市正弦电气股份有限公司 | Double-tube flyback power circuit |
| CN113740597A (en) * | 2020-09-08 | 2021-12-03 | 台达电子企业管理（上海）有限公司 | Switch tube peak voltage detection circuit and method |
| US11804772B2 (en) | 2020-09-08 | 2023-10-31 | Delta Electronics (Shanghai) Co., Ltd. | Startup control method and system, and voltage spike measurement circuit and method |
| US12034366B2 (en) | 2020-09-08 | 2024-07-09 | Delta Electronics (Shanghai) Co., Ltd. | Startup control method and system |
| US12057771B2 (en) | 2020-09-08 | 2024-08-06 | Delta Electronics (Shanghai) Co., Ltd. | Voltage spike measurement circuit and method |
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Address after: 518000 Floors 1-3 and 1-5 of Block A, Block B2, Jinweiyuan Industrial Plant, Longshan District, Pingshan New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Gold Power Technology Co., Ltd. Address before: 518000 Shenzhen, Guangdong, Pingshan new industrial zone, poly dragon hill area Jinwei Industrial Zone A 1 floor. Patentee before: Shenzhen Gold Power Technology Co., Ltd. |