CN102931846B - Power module circuit, power switch chip, Switching Power Supply and method for designing thereof - Google Patents
Power module circuit, power switch chip, Switching Power Supply and method for designing thereof Download PDFInfo
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- CN102931846B CN102931846B CN201210346571.1A CN201210346571A CN102931846B CN 102931846 B CN102931846 B CN 102931846B CN 201210346571 A CN201210346571 A CN 201210346571A CN 102931846 B CN102931846 B CN 102931846B
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Abstract
For a power module circuit for inverse-excitation type switch power-supply, power module circuit comprises: the temperature detection pipe of the starting switch pipe started fast for switching power source chip, the power switch pipe for switching power source chip, the temperature detection for power module circuit, the conducting state detector tube detected for power switch pipe conducting state and for driving the high-voltage and current-limitation resistance of starting switch pipe; Wherein, starting switch pipe, power switch pipe, temperature detection pipe, conducting state detector tube and high-voltage and current-limitation resistance are integrated on same wafer.The present invention also proposes the method for designing of a kind of power switch chip, inverse-excitation type switch power-supply and the power module circuit for inverse-excitation type switch power-supply.The present invention can rapidly starting switch power supply, reduce the temperature detection protection of energy loss and circuit.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, particularly relate to the method for designing of a kind of power module circuit for inverse-excitation type switch power-supply, power switch chip, inverse-excitation type switch power-supply and the power module circuit for inverse-excitation type switch power-supply.
Background technology
During inverse-excitation type switch power-supply electrifying startup, traditional Starting mode comprises the direct charge initiation of outer meeting resistance and high-voltage switch gear current source charge initiation.Outer meeting resistance charge initiation is charged by the power supply storage capacitor of resistance to control circuit thus started power supply.The mode of outer meeting resistance charge initiation is in order to reach toggle speed faster, external starting resistance value can not obtain excessive, simultaneously because can not close after startup completes, still energy loss is had after startup, in order to avoid the loss of starting resistance is excessive, value again can not value too small, the mode toggle speed that external starting resistance directly starts is fast not, has comparatively lossy simultaneously.High-voltage switch gear current source Starting mode flows through controlled charging current by a high-voltage switch gear i.e. metal-oxide-semiconductor of a high voltage depletion mode to carry out charging thus start-up circuit to the power supply electric capacity of switching power source chip.The loss of starting resistance when power standby lossy in occupy larger proportion, just effectively can be reduced the loss of power standby by the loss reducing starting resistance.
In the various losses of inverse-excitation type switch power-supply, the loss of power switch is topmost a kind of loss.In prior art, if do not consider the loss of power switch when design Switching Power Supply, power supply conversion efficiency will be caused low, cause energy waste, do not meet the standard of green energy resource.The dominant loss of power switch pipe is divided into again switching loss and conduction loss.If can monitor the conducting state of power switch pipe, thus realize, to the optimal control of the unlatching of power switch pipe, shutoff and turn on process, effectively to reduce the loss of power switch pipe, improving the conversion efficiency of power supply.
Power device is generally heater members, if temperature increase to over the limiting temperature that device can bear will be damaged, thus to the temperature of power device test and monitoring in addition, the safety of power device to be guaranteed.
Summary of the invention
The technical problem to be solved in the present invention is to overcome that above-mentioned Switching Power Supply of the prior art cannot start fast, conversion efficiency low, energy waste and because work time the heating problem such as cause that circuit is burned, and propose one and there is quick start switch power supply, reduce the multi-functional power module circuit such as energy loss and temperature detection.
For solving the problems of the technologies described above, the present invention proposes a kind of power module circuit for inverse-excitation type switch power-supply, inverse-excitation type switch power-supply comprise with power module circuit with the use of switching power source chip, the switching power source chip of Switching Power Supply comprises power management module, drive circuit module, temperature detecting module and conduction detection module, power module circuit comprises: start required starting switch pipe fast for switching power source chip, comprise the first control end, first input end and the first output, first control end of starting switch pipe and the power management module of the first output connecting valve power supply chip, described starting switch pipe is the first triode, the base stage of described first triode is the first control end of described starting switch pipe, the first input end of the very described starting switch pipe of current collection of described first triode, first output of the very described starting switch pipe of transmitting of described first triode, the base stage of described first triode is connected the power management module of described switching power source chip with emitter, for the power switch pipe of switching power source chip, comprise the second control end, second input and the second output, second control end of power switch pipe and the drive circuit module of the second output connecting valve power supply chip, described power switch pipe is the second triode, the base stage of described second triode is the second control end of described power switch pipe, second input of the very described power switch pipe of current collection of described second triode, second output of the very described power switch pipe of transmitting of described second triode, the base stage of described second triode is connected the drive circuit module of described switching power source chip with emitter, the collector electrode of described second triode connects the collector electrode of described first triode, for the temperature detection pipe of the temperature detection of power module circuit, comprise an input and an output, the temperature detecting module of the input of temperature detection pipe and the equal connecting valve power supply chip of output, for the conducting state detector tube that power switch pipe conducting state detects, comprise input and output, the conduction detection module of the input connecting valve power supply chip of conducting state detector tube, and for driving the high-voltage and current-limitation resistance of starting switch pipe, high-voltage and current-limitation resistance connects the first control end and the first input end of starting switch pipe, wherein, starting switch pipe, power switch pipe, temperature detection pipe, conducting state detector tube and high-voltage and current-limitation resistance are integrated on same wafer, and the output of the first input end of starting switch pipe, the second input of power switch pipe and temperature detection pipe links together.
Preferably, starting switch pipe is the first triode, the base stage of the first triode is the first control end of starting switch pipe, the first input end of the current collection of the first triode very starting switch pipe, first output, the base stage of the first triode and the power management module of emitter connecting valve power supply chip of the transmitting of the first triode very starting switch pipe.
Preferably, power switch pipe is the second triode, the base stage of the second triode is the second control end of power switch pipe, second input of the current collection of the second triode very power switch pipe, second output of the transmitting of the second triode very power switch pipe, the base stage of the second triode and the drive circuit module of emitter connecting valve power supply chip, the collector electrode of the second triode connects the collector electrode of the first triode.
Preferably, temperature detection pipe is the first diode, and the negative electrode of the first diode is all connected temperature detecting module with anode.
Preferably, conducting state detector tube is the second diode, the input of conducting state detector tube is the anode of the second diode, the output of conducting state detector tube is the negative electrode of the second diode, the conduction detection module of the anode connecting valve power supply chip of the second diode, the negative electrode of the second diode connects the second input of power switch pipe.
The present invention also provides a kind of power switch chip, comprises power module circuit described above.
The present invention also provides a kind of inverse-excitation type switch power-supply, comprises rectification circuit, transformer, sampling feedback circuit, switching power source chip and power switch chip, and power switch chip is above-mentioned power switch chip.
The present invention also provides a kind of method for designing of the power module circuit for inverse-excitation type switch power-supply, comprise the following steps: be designed for the starting switch pipe coordinating the power management module of switching power source chip to start inverse-excitation type switch power-supply fast, comprise the first control end, first input end and the first output, first control end of starting switch pipe and the power management module of the first output connecting valve power supply chip, described starting switch pipe is the first triode, the base stage of described first triode is the first control end of described starting switch pipe, the first input end of the very described starting switch pipe of current collection of described first triode, first output of the very described starting switch pipe of transmitting of described first triode, the base stage of described first triode is connected the power management module of described switching power source chip with emitter, be designed for the power switch pipe of switching power source chip, comprise the second control end, second input and the second output, second input of power switch pipe connects the first input end of starting switch pipe, second control end of power switch pipe and the drive circuit module of the second output connecting valve power supply chip, described power switch pipe is the second triode, the base stage of described second triode is the second control end of described power switch pipe, second input of the very described power switch pipe of current collection of described second triode, second output of the very described power switch pipe of transmitting of described second triode, the base stage of described second triode is connected the drive circuit module of described switching power source chip with emitter, the collector electrode of described second triode connects the collector electrode of described first triode, be designed for the temperature detection pipe of the temperature detecting module detection power modular circuit temperature coordinating switching power source chip, comprise an input and an output, the temperature detecting module of the input of temperature detection pipe and the equal connecting valve power supply chip of output, be designed for the conducting state detector tube of the power switch pipe conducting state coordinating switching power source chip conduction detection module detection power modular circuit, comprise input and output, the conduction detection module of the input connecting valve power supply chip of conducting state detector tube, the output of conducting state detector tube connects the first input end of starting switch pipe, and being designed for the high-voltage and current-limitation resistance that realizing circuit starts fast, high-voltage and current-limitation resistance connects the first control end and the first input end of starting switch pipe, design starting switch pipe, power switch pipe, temperature detection pipe, conducting state detector tube and high-voltage and current-limitation resistance are integrated on same wafer.
Compared with prior art; beneficial effect of the present invention comprises: the present invention starts slowly by existing for the Switching Power Supply of prior art, power consumption is large, the problem of easily heating; by power module circuit and switching power source chip with the use of; Switching Power Supply can be started rapidly; and reduce the loss of power standby; more improve the conversion efficiency of power supply, and temperature detection and protection can be carried out to power device.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the preferred embodiment of power module circuit of the present invention.
Wherein, description of reference numerals is as follows:
Power module circuit 1: the one NPN triode Q1 the 2nd NPN triode Q2 temperature detection pipe D1 conducting state detector tube D2 high-voltage and current-limitation resistance R1
Switching power source chip 2: control module 21 power management module 22 drive circuit module 23 temperature detecting module 24 conduction detection module 25
Rectification circuit 3 transformer 4 sampling feedback circuit 5
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
Refer to Fig. 1, a kind of power module circuit 1 for inverse-excitation type switch power-supply, comprising: a starting switch pipe, a power switch pipe, a temperature detection pipe, a conducting state detector tube and a high-voltage and current-limitation resistance R1.
Inverse-excitation type switch power-supply comprises a switching power source chip 2.Switching power source chip 2 comprises control module 21, power management module 22, driving circuit module 23, temperature detecting module 24 and a conduction detection module 25.Power management module 22, drive circuit module 23, temperature detecting module 24 and conduction detection module 25 be link control module 21 all.
Wherein, high-voltage and current-limitation resistance drives starting switch pipe, starting switch pipe coordinates power management module 22 to start inverse-excitation type switch power-supply, power switch pipe coordinates drive circuit module 23 switch control rule inverse-excitation type switch power-supply, conducting state detector tube coordinates conduction detection module detection power switching tube conducting state, and temperature detection pipe coordinates temperature detecting module 24 detection power modular circuit 1 temperature.
Starting switch pipe comprises one first control end, a first input end and one first output.Power switch pipe comprises one second control end, one second input and one second output.Temperature detection pipe comprises an output and an input.Conducting state detector tube comprises an input and an output.First control end of starting switch pipe and first input end all connect power management module 22, the first input end of power switch pipe connects the first input end of starting switch pipe, power switch pipe connects drive circuit module 23, the input of temperature detection pipe D1 is connected temperature detecting module 24 with output, the negative electrode of conducting state detector tube connects the first input end of power switch pipe, and high-voltage and current-limitation resistance R1 connects the first control end and the first input end of starting switch pipe.Wherein, starting switch pipe, power switch pipe, temperature detection pipe, conducting state detector tube and high-voltage and current-limitation resistance are integrated on same wafer.
Refer to Fig. 1, the circuit theory diagrams of the preferred embodiment of power module circuit application of the present invention.In the present embodiment, starting switch pipe adopts a NPN triode Q1, and power switch pipe adopts the 2nd NPN triode Q2.The base stage of the one NPN triode Q1 is the first control end of starting switch pipe, the first input end of the current collection of a NPN triode Q1 very starting switch pipe, the first output of the transmitting of a NPN triode Q1 very starting switch pipe.Be connected with power management module 22 between the base stage of the one NPN triode Q1 and emitter, between the base stage of a NPN triode Q1 and collector electrode, be connected with high-voltage and current-limitation resistance R1.The base stage of the 2nd NPN triode Q2 is the first control end of power switch pipe, the first input end of the current collection of the 2nd NPN triode Q2 very power switch pipe, first output of the transmitting of the 2nd NPN triode Q2 very power switch pipe, the base stage of the 2nd NPN triode Q2 is connected drive circuit module 23 with emitter.Certainly, in other embodiments, also can replace NPN triode by PNP triode, also can replace with metal-oxide-semiconductor, now circuit needs to adjust according to actual conditions.
When starting switch pipe adopts triode time, the Starting mode of power-supply system is Current amplifier formula Starting mode.Current amplifier formula Starting mode be by a high-voltage three-pole pipe by a faint Current amplifier to certain value, charged thus start-up circuit by the power supply electric capacity (not shown) of power management module 22 pairs of control modules 21.In general, utilize this kind of mode to start all to need one independently non-essential resistance produce the electric current starting and trigger, but this just need one independently external pin connect non-essential resistance, because the pin number of conventional integrated antenna package form is limited, takies an individual pin and will cause being restricted during other functions of chip design.So, the present embodiment by one for provide drive starting switch pipe high-voltage and current-limitation resistance R1 and a NPN triode Q1 be integrated in same wafer simultaneously, and this high-voltage and current-limitation resistance R1 is directly connected with collector electrode with the base stage of a NPN triode Q1, just no longer need independently leading foot.Power supply electric capacity is charged to thus start up system after the weak current of high-voltage and current-limitation resistance R1 amplifies by the amplification namely by a NPN triode Q1 after this power module circuit 1 is connected to circuit.
One NPN triode Q1 also can use as power switch except having the effect of startup power supply, but this just needs second extra switching tube, to realize the control of the current charges after by amplification to power supply electric capacity.Second switching tube Q3 that now a NPN triode Q1 is extra produces power consumption in switching process.This connected mode is not best scheme.Therefore, the present embodiment also makes the independent power switch pipe for switch control rule a 2nd NPN triode Q2 and solves the problems referred to above.
In this enforcement, completed by high-voltage and current-limitation resistance R1 and a NPN triode Q1 when powering on simultaneously and start charging work, 2nd NPN triode Q2 is exclusively used in power switch, so no longer needs a NPN triode Q1 as shown in Figure 1 to serve as the function of power switch pipe again, just reduces switching loss.
Conducting state detector tube is the second diode D2.The input of conducting state detector tube is the anode of the second diode D2, and the output of conducting state detector tube is the negative electrode of the second diode D2.The negative electrode of conduction detection module 25, the second diode D2 of the anode connecting valve power supply chip of the second diode D2 connects the first input end of the 2nd NPN switching tube Q2.
When power switch pipe uses triode time, generally all drive current can be increased to triode all has enough conducting degree of depth under any condition.Supersaturation state is all in, so will turn-off speed be caused extremely slow because of too much base charge when switch-off power switching tube when power switch pipe is opened.Make triode operation in critical statisfaction state if reduce drive current, switching speed faster can be realized, but may cause driving deficiency under different temperatures and loading condition, power switch pipe is made to be operated in linear condition, cause power switch pipe transformation efficiency low, the too high even thermal breakdown of temperature.Therefore, the present embodiment is by increase conducting state detector tube D2, and by coordinating conduction detection module to detect power switch pipe opening state, thus automatically adjust drive condition according to external condition, the optimization realizing triode drives.
In the present embodiment, the second diode D2 and the 2nd NPN triode Q2 is produced on same semiconductor chip, and also an independent diode chip for backlight unit can be interconnected by metal and power switch pipe or directly interconnected on PCB realizes.In the present embodiment, anode and the negative electrode of temperature detection pipe D1 are all connected described temperature detecting module 24.
The present invention also proposes a kind of power switch chip, comprises above-mentioned power module circuit.Now, the pin of power switch chip comprises the second input of the first control end of starting switch pipe, the first output of starting switch pipe, the second control end of power switch pipe, the second output of power switch pipe, the input of temperature detection pipe, the output of temperature detection pipe, the input of conducting state detector tube and power switch pipe.In the present embodiment, switching tube is NPN triode, then the pin that this power switch chip is corresponding is the base stage of a NPN triode Q1, emitter, the base stage of the 2nd NPN triode Q2, collector electrode, emitter, the anode of the first diode D1 and the anode of negative electrode and the second diode D2.This power chip and switching power source chip with the use of, make the toggle speed of Switching Power Supply accelerate, reduce the power loss of Switching Power Supply and prevent Switching Power Supply temperature too high and damage.
Please continue to refer to Fig. 1, the present invention also proposes a kind of inverse-excitation type switch power-supply, comprises rectification circuit 3, transformer 4, sampling feedback circuit 5, switching power source chip 2 and a power switch chip 1.Power switch chip is above-mentioned power switch chip.One end of the primary coil of transformer 4 connects the negative electrode of the conducting state detector tube D2 in power switch chip.As we can see from the figure, on the basis of inverse-excitation type switch power-supply, increase a power switch chip, little to original structural modification, and improve the performance of Switching Power Supply.
The present invention also proposes a kind of method for designing of the power module circuit for inverse-excitation type switch power-supply, comprises the following steps:
Be designed for the starting switch pipe coordinating the power management module of described switching power source chip to start described inverse-excitation type switch power-supply fast, comprise the first control end, first input end and the first output, the first control end of described starting switch pipe is connected the power management module 22 of described switching power source chip with the first output;
Be designed for the power switch pipe of switching power source chip, comprise the second control end, the second input and the second output, second input of described power switch pipe connects the first input end of described starting switch pipe, and the second control end of described power switch pipe is connected the drive circuit module 23 of described switching power source chip with the second output;
Be designed for the conducting state detector tube coordinating switching power source chip conduction detection module to detect the power switch pipe conducting state of described power module circuit, comprise input and output, the input of described conducting state detector tube connects the conduction detection module 24 of described switching power source chip, and the output of described conducting state detector tube connects the first input end of described starting switch pipe; And
Be designed for the high-voltage and current-limitation resistance driving starting switch pipe, make high-voltage and current-limitation resistance connect the first control end and the first input end of starting switch pipe;
Design starting switch pipe, power switch pipe, temperature detection pipe, conducting state detector tube and high-voltage and current-limitation resistance are integrated on same wafer.It should be noted that drive circuit module 23 can be PWM (pulse-width modulation circuit), PFM (pulse frequency modulation circuit) or PSM (pulse number modulation circuit).
Compared with prior art, the present invention is adopted to be used for the power module circuit of inverse-excitation type switch power-supply, by increasing this power module circuit on the basis of inverse-excitation type switch power-supply, can when powering on rapidly starting switch power supply, reduce circuit idling consumption, improve Switching Power Supply conversion efficiency and can the temperature of detection power modular circuit make circuit thermal breakdown to occur and damages.
The foregoing is only better possible embodiments of the present invention, not limit the scope of the invention.All utilizations specification of the present invention and the change of the equivalent structure done by accompanying drawing content, be all included in protection scope of the present invention.
Claims (6)
1. the power module circuit for inverse-excitation type switch power-supply, described inverse-excitation type switch power-supply comprise with described power module circuit with the use of switching power source chip, the switching power source chip of described Switching Power Supply comprises power management module, drive circuit module, temperature detecting module and conduction detection module, it is characterized in that, described power module circuit comprises:
Required starting switch pipe is started fast for switching power source chip, comprise the first control end, first input end and the first output, first control end of described starting switch pipe and the power management module of the first output connecting valve power supply chip, described starting switch pipe is the first triode, the base stage of described first triode is the first control end of described starting switch pipe, the first input end of the very described starting switch pipe of current collection of described first triode, first output of the very described starting switch pipe of transmitting of described first triode, the base stage of described first triode is connected the power management module of described switching power source chip with emitter,
For the power switch pipe of switching power source chip, comprise the second control end, second input and the second output, second control end of described power switch pipe and the drive circuit module of the second output connecting valve power supply chip, described power switch pipe is the second triode, the base stage of described second triode is the second control end of described power switch pipe, second input of the very described power switch pipe of current collection of described second triode, second output of the very described power switch pipe of transmitting of described second triode, the base stage of described second triode is connected the drive circuit module of described switching power source chip with emitter, the collector electrode of described second triode connects the collector electrode of described first triode,
For the temperature detection pipe of the temperature detection of described power module circuit, comprise an input and an output, input and the output of described temperature detection pipe are all connected the temperature detecting module of described switching power source chip;
For the conducting state detector tube that described power switch pipe conducting state detects, comprise input and output, the input of described conducting state detector tube connects the conduction detection module of described switching power source chip; And
For driving the high-voltage and current-limitation resistance of described starting switch pipe, described high-voltage and current-limitation resistance connects the first control end and the first input end of described starting switch pipe;
Wherein, described starting switch pipe, described power switch pipe, described temperature detection pipe, described conducting state detector tube and described high-voltage and current-limitation resistance are integrated on same wafer, and the output of the first input end of described starting switch pipe, the second input of power switch pipe and temperature detection pipe links together.
2. power module circuit as claimed in claim 1, it is characterized in that, described temperature detection pipe is the first diode, and the negative electrode of described first diode is all connected described temperature detecting module with anode.
3. power module circuit as claimed in claim 2, it is characterized in that, described conducting state detector tube is the second diode, the input of described conducting state detector tube is the anode of described second diode, the output of described conducting state detector tube is the negative electrode of described second diode, the anode of described second diode connects the conduction detection module of described switching power source chip, and the negative electrode of described second diode connects the second input of described power switch pipe.
4. a power switch chip, is characterized in that, comprises the power module circuit as described in claims 1 to 3 any one.
5. an inverse-excitation type switch power-supply, comprises rectification circuit, transformer, sampling feedback circuit, switching power source chip and power switch chip, it is characterized in that, described power switch chip is power switch chip according to claim 4.
6. for a method for designing for the power module circuit of inverse-excitation type switch power-supply, it is characterized in that, comprise the following steps:
Be designed for the starting switch pipe coordinating the power management module of described switching power source chip to start described inverse-excitation type switch power-supply fast, comprise the first control end, first input end and the first output, first control end of described starting switch pipe is connected the power management module of described switching power source chip with the first output, described starting switch pipe is the first triode, the base stage of described first triode is the first control end of described starting switch pipe, the first input end of the very described starting switch pipe of current collection of described first triode, first output of the very described starting switch pipe of transmitting of described first triode, the base stage of described first triode is connected the power management module of described switching power source chip with emitter,
Be designed for the power switch pipe of switching power source chip, comprise the second control end, second input and the second output, second input of described power switch pipe connects the first input end of described starting switch pipe, second control end of described power switch pipe is connected the drive circuit module of described switching power source chip with the second output, described power switch pipe is the second triode, the base stage of described second triode is the second control end of described power switch pipe, second input of the very described power switch pipe of current collection of described second triode, second output of the very described power switch pipe of transmitting of described second triode, the base stage of described second triode is connected the drive circuit module of described switching power source chip with emitter, the collector electrode of described second triode connects the collector electrode of described first triode,
Be designed for the temperature detection pipe coordinating the temperature detecting module of switching power source chip to detect described power module circuit temperature, comprise an input and an output, input and the output of described temperature detection pipe are all connected the temperature detecting module of described switching power source chip;
Be designed for the conducting state detector tube coordinating switching power source chip conduction detection module to detect the power switch pipe conducting state of described power module circuit, comprise input and output, the input of described conducting state detector tube connects the conduction detection module of described switching power source chip, and the output of described conducting state detector tube connects the first input end of described starting switch pipe; And
Be designed for the high-voltage and current-limitation resistance that realizing circuit starts fast, described high-voltage and current-limitation resistance connects the first control end and the first input end of described starting switch pipe;
Design described starting switch pipe, described power switch pipe, described temperature detection pipe, described conducting state detector tube and described high-voltage and current-limitation resistance to be integrated on same wafer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210346571.1A CN102931846B (en) | 2012-09-18 | 2012-09-18 | Power module circuit, power switch chip, Switching Power Supply and method for designing thereof |
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| CN201210346571.1A CN102931846B (en) | 2012-09-18 | 2012-09-18 | Power module circuit, power switch chip, Switching Power Supply and method for designing thereof |
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| CN102931846B true CN102931846B (en) | 2015-08-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483391A (en) * | 2007-11-29 | 2009-07-15 | 意法半导体股份有限公司 | Self-supply circuit and method for a voltage converter |
| CN202309657U (en) * | 2011-03-28 | 2012-07-04 | 天津瑞能电气有限公司 | Power switch based on IGBT module |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483391A (en) * | 2007-11-29 | 2009-07-15 | 意法半导体股份有限公司 | Self-supply circuit and method for a voltage converter |
| CN202309657U (en) * | 2011-03-28 | 2012-07-04 | 天津瑞能电气有限公司 | Power switch based on IGBT module |
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