CN105871237A - Isolated power supply circuit for floating gate driving power supply - Google Patents
Isolated power supply circuit for floating gate driving power supply Download PDFInfo
- Publication number
- CN105871237A CN105871237A CN201610284017.3A CN201610284017A CN105871237A CN 105871237 A CN105871237 A CN 105871237A CN 201610284017 A CN201610284017 A CN 201610284017A CN 105871237 A CN105871237 A CN 105871237A
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- Prior art keywords
- circuit
- diode
- power supply
- gate driver
- isolated gate
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Abstract
The invention discloses an isolated power supply circuit for a floating gate driver. The isolated power supply circuit provides an isolated power supply for an insulated gate bipolar transistor (IGBT) of an inverter and a gate driver of a doublediffusion metal-oxide-semiconductor (DMOS) transistor. A driving circuit provides a power supply for an isolated gate driver for receiving a control voltage, and in response to the control voltage, the driving circuit uses power coming from the driving circuit to output gate control signals coupled to an isolated gate bipolar transistor. The driving circuit comprises a rectifying circuit, power signals having logic output and an isolated gate driving circuit on a common node, wherein the rectifying circuit is coupled to a power supply voltage, a starting circuit and a resonance circuit. According to the circuit, the simple, effective and economical isolated power supply is provided for gate drivers of IGBTs and DMOS transistors, such as inverters used for motors, uninterrupted power systems and inverters used by other devices. The potential of an insulated gate is floating relative to the ground.
Description
Technical field
The present invention relates to field of power supplies, a kind of power driving circuit being used in isolated gate driver.
Background technology
Gate drivers is that an interface circuit is for providing control voltage (and this electric current produced) to bimetallic oxide half
Conductor (DMOS) and igbt (IGBT) device are used for driving motor and other equipment.During operation,
The input of this gate drivers can be driven by a logic level signal or some other low level signal.One isolated gate
Driver is a kind of special gate drivers, it is simply that segregate between inputting and exporting, in addition circuit has typical case
The characteristic of gate drivers.
Isolated gate driver generally needs insulating power supply.When motor-drive circuit uses gate drivers, each IGBT
An insulating power supply will be used, add up totally six more than.The design circuit complexity of this multiple power supply is high, because of
And add difficult design and production cost, reduce reliability and the life of product of circuit.The cloth of each insulating power supply circuit
Line node often can cause Radio frequency interference (RFI) with high speed switching signal as antenna, is unfavorable near drive circuit
Internal circuit and the normal work of radio frequency reception.Proposing to have two solutions, one uses DC-to-DC before
(DC/DC) transducer, another uses electric charge pump.This DC to DC converter has higher efficiency, and (90%-80% turns
Change efficiency), but its relative volume is big, complicated and cost price is expensive.And electric charge pump is relatively easy and economical, but turn
Change efficiency low, only 40%.
Summary of the invention
It is an object of the invention to provide the insulating power supply circuit of the floating grid driver of a kind of high-conversion rate, above-mentioned to solve
The problem pointed out in background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of floating grid drive power supply insulating power supply circuit, including voltage source V1, voltage source V2, control voltage V3,
Isolated gate driver IC1 and isolated gate driver IC2.Described voltage source V1 positive pole connects diode D2 respectively
Negative pole, resistance R10, inductance L14 and audion VT1 colelctor electrode, the inductance L14 other end connects electric capacity C3, electric capacity C3
The other end connects the resistance R10 other end, diode D11 negative pole and diode D12 positive pole respectively, and diode D12 negative pole divides
Lian Jie the VCC end of isolated gate driver IC1 and the INP end of electric capacity C13, isolated gate driver IC1 not pass through
Resistance R5 is connected to control voltage V3 positive pole, controls the INN end that voltage V3 negative pole connects isolated gate driver IC1
And ground connection, the OUT terminal connecting triode VT1 base stage of isolated gate driver IC1, isolated gate driver IC1's
COM end connect respectively the electric capacity C13 other end, diode D11 positive pole, audion VT1 emitter stage, resistance R9, inductance L15,
Audion VT2 colelctor electrode, diode D2 positive pole, inductance L1 and diode D4 negative pole, the inductance L1 other end connects ground connection
Resistance R1, diode D4 positive pole connect respectively voltage source V2 negative pole, audion VT2 emitter stage, diode D13 positive pole,
The COM end of electric capacity C6 and isolated gate driver IC1, voltage source V2 positive pole connects voltage source V1 negative pole ground connection,
The OUT terminal connecting triode VT2 base stage of described isolated gate driver IC1, the VCC of isolated gate driver IC1
End connects diode D14 negative pole and the electric capacity C6 other end respectively, diode D14 positive pole connect respectively the resistance R9 other end,
Diode D13 negative pole and electric capacity C5, the electric capacity C5 other end connects the inductance L15 other end.
Compared with prior art, the invention has the beneficial effects as follows: according to a circuit of the present invention, to IGBT and DMOS
The gate drivers of transistor provides simple, an effective and insulating power supply for economy, as those are used in the inversion of motor
Device, uninterruptible power system, and the inverter that other equipment are used.
Accompanying drawing explanation
Fig. 1 is for driving the block diagram of three power control circuits of motor according to the present invention；
Fig. 2 is a power control circuit block diagram in Fig. 1；
Fig. 3 is the detailed maps of the power control circuit of Fig. 2；
Fig. 4 is that display carrys out the timing diagram on different nodes of the signal waveform on comfortable this power control circuit of operation Fig. 3；
Fig. 5 is the schematic diagram of a rectification circuit of another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
Referring to Fig. 1～5, in the embodiment of the present invention, a kind of floating grid drives the insulating power supply circuit of power supply, including voltage source
V1, voltage source V2, control voltage V3, isolated gate driver IC 1 and isolated gate driver IC 2, described voltage source
V1 positive pole connects diode D2 negative pole, resistance R10, inductance L14 and audion VT1 colelctor electrode respectively, and inductance L14 is another
One end connects electric capacity C3, and the electric capacity C3 other end is connected respectively to the resistance R10 other end, diode D11 negative pole and diode
D12 positive pole, diode D12 negative pole connects VCC end and electric capacity C13, the isolated gate of isolated gate driver IC 1 respectively
The INP end of driver IC 1 connects voltage source V3 positive pole by resistance R5, and voltage source V3 negative pole connects isolated gate and drives
The INN end of device IC1 ground connection, the OUT terminal connecting triode VT1 base stage of isolated gate driver IC 1, isolated gate drives
The COM end of dynamic device IC1 connects the electric capacity C13 other end, diode D11 positive pole, audion VT1 emitter stage, resistance respectively
R9, inductance L15, audion VT2 colelctor electrode, diode D2 positive pole, inductance L1 and diode D4 negative pole, inductance L1
The other end connect earth resistance R1, diode D4 positive pole connect respectively voltage source V2 negative pole, audion VT2 emitter stage, two
Pole pipe D13 positive pole, electric capacity C6 and the COM end of isolated gate driver IC 1, voltage source V2 positive pole connects voltage source V1
Negative pole ground connection, the OUT terminal connecting triode VT2 base stage of described isolated gate driver IC 1, isolated gate driver IC 1
VCC end connect diode D14 negative pole and the electric capacity C6 other end respectively, it is another that diode D14 positive pole connects resistance R9 respectively
One end, diode D13 negative pole and electric capacity C5, the electric capacity C5 other end connects the inductance L15 other end.
A circuit according to the present invention, for the gate drivers of IGBT and DMOS transistor provide one simple, high
Effect and the insulating power supply of economy, such as those motor drivers (VSD), uninterruptible power system (UPS), and other set
The standby inverter used.The power supply of isolated gate is that (i.e. it is in floating in the control input port of gate drivers relative to ground
Independent current potential, it may be coupled to a microcontroller or single-chip microcomputer).
The operation principle of the present invention is: refer to Fig. 1～5,
Fig. 1 shows according to the present invention for three power control circuits (1,2,3) driving motor to build, this merit
Rate control circuit comprises the concrete embodiment of the present invention being detailed further below.
This power control circuit receives input (1,2,3) from a motor controller (not shown), and produces multiple defeated
Go out and drive each electromechanical device element.
The detailed view of the power control circuit 1 of Fig. 1 that Fig. 2 demonstrates.Due to power control circuit 2 and 3 and power control
Circuit 1 processed is similar to, and no longer repeats to make detail discussion and analysis to it.Power control circuit 1 receives two at input 1 end
Control signal (CTL1 and CTL2).This control signal is coupled to the raster data model (IGD) 220 and 222 of two insulation.
According to the structure of the present invention, the two IGD is coupled to two drive circuits (224 and 226).Two insulated gate bipolars
Transistor (228 and 230) is coupled to two drivings (224 and 226) and isolated gate driver (220 and 222),
To produce an output 232, it is alternatively coupled to load, a such as device element on this motor of Fig. 1.
Fig. 3 is the schematic diagram of the power control circuit 1 in Fig. 2.This circuit 1 uses " resonance converter " principle, is
One both simple and economic and high efficiency conversion solution.It is preferred that the upper strata circuit 102 that this circuit 1 comprises
All formed by with equivalent components and parts with a lower circuit 104, be upper strata circuit be consistent with lower circuit.?
In this case, it is only necessary to one of them of detailed description the two circuit.In the circuit 1, resistance R10, inducer
L14, capacitor C13, diode dp1a12, diode dp1a11 and electric capacity C3 are a upper strata gate drivers 108
Power supply is provided；And resistor R9, inducer L15, capacitor C6, diode dp1a13, diode dp1a14 and electric capacity
C5 provides power supply for lower-layer gate driver 130.
This upper strata circuit 102 include one control voltage 106, a upper strata gate driver circuit 108, start-up circuit 110,
One resonance converter 112 and a rectification circuit 114.The output 116 of raster data model 108 is coupled to IGBT 118.
Upper strata circuit 102 is coupled to first power supply 120 via a cathode power supply rail 122, and lower circuit 104 is simultaneously
It is coupled to second power supply 124 via a negative power supply rail 126 at IGBT128.This had both controlled voltage 106
Being the CTL1 voltage proposed in Fig. 2, it can derive from single-chip microcomputer or other circuit.
This controls voltage 106 can be adjusted to the pulse width (i.e. turn-on time and shut-in time) of washability, makes electricity
The output on road (at node 5) can select switch time by control.Control voltage 106 and control voltage 107 can lead to
Overregulate so that the time of upper strata circuit 102 and lower circuit 104 alternation switch occurs without overlap, thus allow output to remove mould
Intend input.The two controls voltage (106,107) and only has the voltage level of several volts, and can be one in the output of node 5
There is similar waveform but relatively high voltage level much.
Circuit 1 can describe according to a starting state and a stable state.On startup, the power supply of raster data model 108 is
Supplied by the resistor R10 of start-up circuit 110.Upon actuation, controlled resonant converter 112 is taken over and can provide higher than starting electricity
The power supply in source.This raster data model 108 needs less power supply on startup, needs bigger in stable (operation) state
Power supply.After multiple IGBTs (118,128) start switching, always produce at node 5 from their meeting of input controlling voltage
A raw square wave.The voltage at IGBT1 118 two ends is equivalent to the voltage difference between the right path 102 (+170 volt) and node 5.
Square wave is 340 volts at the amplitude of node 5, and is also the input of resonance converter 112.When voltage is switched to 340 from 0 volt
Fu Shi, electric current will be by inductance L14, and C13 is charged to cathode voltage by electric capacity C3, diode dp1a12.This above-mentioned electricity
The positive terminal of C3 will be charged to more than 340 volts by stream.At the moment, electric current can start reverse flow.In the same time,
Current loop can be closed by diode dp1a11.In ensuing half period, by diode dp1a11 electric current again
Secondary reverse, charges to C13 again.This vibration will continue, until at series resonant converter 112 (L14, C3)
Energy is transferred to C13.
The power of switching IGBT 118 is directly proportional to switching frequency, and the power that resonance converter 112 transmits also is and opens
Close what frequency was directly proportional.Multiple resonance converters, such as resonance converter 112, be all by the pulse with short lifting time
Waveform (impulse waveform is square wave in one case) drives.Electric current can flow through series LC network (L14, C3) and drive
Signal load in changing each time.This circuit is higher than pulse frequency in its natural frequency resonated.Owing to energy shifts
Occurring when switching, the power of output is directly proportional to frequency.This makes to provide preferably between the demand and supply of power supply
Follow the tracks of.
Fig. 4 is shown that operating relevant signal waveform to the circuit in Fig. 3.Signal waveform in Fig. 4 shows Fig. 3
The voltage amplitude of middle different node and time (microsecond unit) draw.Such as, waveform 202 shows at node 7 and joint
Voltage between point 5, waveform 204 shows that the voltage on node 8, waveform 206 show at node 10 and node 9
Between voltage, waveform 208 shows that the voltage between node 11 and node 5, waveform 210 show at node 6
And the voltage between node 5, and waveform 212 shows the voltage on node 5.Waveform 212 is similar to control electricity
The waveform of pressure 106, but the level controlling voltage is all the lowest (0-15 volt).
Fig. 5 shows another embodiment of rectifier circuit 114, perhaps can be used for providing negative pole in the case of being necessary
Drive.For the sake of clarity, the schematic diagram that in the middle part of Fig. 3, split-phase is closed the most only has been repeated.
In rectifier circuit 114, diode dp1a11 does not return to common node (5), is coupled to another on the contrary
Electric capacity C300.The other end of this capacitor C300 is coupled on common node 5.Therefore, as shown in bearing in Fig. 5
Node Vss is generated.One Zener diode Z302 is also coupling between common node 5 and Vss.Therefore, one
Individual gate drivers 108 is also coupled to Vss.As a result of which it is, the output 116 of gate drivers can provide positive and negative two-stage
Control voltage.In one embodiment, Zener diode can have the breakdown voltage in about 6 to 8 volt scopes.
The present invention provides the circuit of a low cost can avoid too much and complicated circuit to power supply, and can put it in raster data model
Device and the junction of IGBT.For those personages having grasped certain technical ability, in the feelings without departing from the scope of the present invention
Under condition, modifying above-mentioned method and embodiment or changing is possible to occur.Therefore, disclosure herein and description purport
Do not limit the scope of the invention in example and propose following statement.
Present invention statement is:
1.A kind of drive circuit, for providing power supply to isolated gate driver, wherein isolated gate driver receives one
Control voltage, and when controlling voltage in response to this, use the power output of driving circuit to be connected to isolated gate bipolar
The grid control signal of transistor (IGBT), this drive circuit includes:
One start-up circuit is coupled to supply voltage；
One resonance circuit is coupled in start-up circuit and supply voltage；
One rectification circuit is coupled to start-up circuit and resonance circuit, and has logic output and be coupled to the merit that isolated gate drives
Rate signal, commutator is also coupled to the IGBT in isolated gate driver and a common node, the most whole
Stream device constitutes the bidirectional current path between resonance circuit and common node.
2.The drive circuit of statement 1, start-up circuit therein is a resistor, have one with supply voltage and one
Resonance circuit that two ends are coupled to and the resistor of the first terminal of rectification circuit.
3.The drive circuit of statement 1, wherein said resonance circuit includes:
One is inductively coupled to supply voltage；
One is capacitively coupled to inductance, start-up circuit and rectification circuit.
4.The drive circuit of statement 1, wherein said rectification circuit includes:
First negative electrode of first diode is coupled to start-up circuit and resonance circuit, and the first anode coupling of this diode
To a common node；
The anode of second diode is coupled to first negative electrode of start-up circuit, resonance circuit and first diode, and this is years old
Second negative electrode of two diodes is coupled to a power supply node, for providing power supply to isolated gate driver；
First end of one capacitor is connected to this power supply node and the second end is connected to this common node.
5.A kind of drive circuit, for providing power supply to isolated gate driver, wherein isolated gate driver receives and controls
Voltage, and in response to when controlling voltage, use the power output of driving circuit to be connected to IGBT
Grid control signal, this drive circuit includes:
First start-up circuit is coupled to supply voltage；
First resonance circuit is coupled to start-up circuit and supply voltage；
First rectification circuit is coupled to start-up circuit and resonance circuit, and has logic and export one and be coupled to isolated gate
The power signal that pole drives, this commutator is additionally coupled to the isolated gate driver of a common node, wherein commutator
Including:
First negative electrode of first diode is coupled to start-up circuit and resonance circuit, and the first anode of this diode
It is coupled to a common node；
First capacitor is coupling in the centre of first cathode terminal and common node.
The anode of second diode is coupled to start-up circuit, resonance circuit and first negative electrode of first diode, should
Second negative electrode of second diode is coupled to a power supply node, for providing electricity to isolated gate driver
Source；
First end of second capacitor is coupling in second anode and power supply node, and the second end is coupled to common node.
First Zener diode is coupling between common node and the first anode, is wherein coupled to the first anode and creates one
Individual Vss node is also coupled to isolated gate driver.
6.The statement 5 of drive circuit, wherein bipolar transistor with insulated gate electrode replaces to DMOS transistor.
7.The statement 1 of drive circuit, wherein bipolar transistor with insulated gate electrode replaces to DMOS transistor.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and do not carrying on the back
In the case of the spirit or essential attributes of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter from
From the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all by fall in the implication of equivalency and scope of claim
Change is included in the present invention.Should not be considered as limiting involved claim by any reference in claim.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only comprises
One independent technical scheme, this narrating mode of description is only the most for clarity sake, and those skilled in the art should be by
Description is as an entirety, and the technical scheme in each embodiment can also be through appropriately combined, and forming those skilled in the art can
With other embodiments understood.
Claims (1)
1. an insulating power supply circuit for floating grid driver, including voltage source V1, voltage source V2, control voltage V3,
Isolated gate driver IC1 and isolated gate driver IC2.It is characterized in that, described voltage source V1 positive pole is respectively
Connecting diode D2 negative pole, resistance R10, R L14 and audion VT1 colelctor electrode, the inductance L14 other end connects electric capacity C3,
The electric capacity C3 other end connects the resistance R10 other end, diode D11 negative pole and diode D12 positive pole, diode D12 respectively
Negative pole connects VCC end and the electric capacity C13 of isolated gate driver IC1, the INP of isolated gate driver IC1 respectively
Hold to be connected by resistance R5 and control voltage V3 positive pole, control the INN that voltage V3 negative pole connects isolated gate driver IC1
End ground connection, the OUT terminal connecting triode VT1 base stage of isolated gate driver IC1, isolated gate driver IC1
COM end connect the electric capacity C13 other end, diode D11 positive pole, audion VT1 emitter stage, resistance R9, inductance respectively
L15, audion VT2 colelctor electrode, diode D2 positive pole, inductance L1 and diode D4 negative pole, the inductance L1 other end is even
Meet earth resistance R1；Diode D4 positive pole connects voltage source V2 negative pole, audion VT2 emitter stage, diode D13 respectively
The COM end of positive pole, electric capacity C6 and isolated gate driver IC1, voltage source V2 positive pole connects voltage source V1 negative pole also
Ground connection, the OUT terminal connecting triode VT2 base stage of described isolated gate driver IC1, isolated gate driver IC1
VCC end connect diode D14 negative pole and the electric capacity c6 other end respectively, it is another that diode D14 positive pole connects resistance r9 respectively
One end, diode D13 negative pole and electric capacity C5, the electric capacity C5 other end connects the inductance L15 other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284017.3A CN105871237A (en) | 2016-04-29 | 2016-04-29 | Isolated power supply circuit for floating gate driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284017.3A CN105871237A (en) | 2016-04-29 | 2016-04-29 | Isolated power supply circuit for floating gate driving power supply |
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| CN105871237A true CN105871237A (en) | 2016-08-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222744B1 (en) * | 1999-03-19 | 2001-04-24 | General Electronics Applications, Inc. | Isolated power supply circuit for a floating gate driver |
| US20090200981A1 (en) * | 2007-08-24 | 2009-08-13 | Lumsden John L | System and method for providing constant loading in ac power applications |
| CN103166614A (en) * | 2011-12-12 | 2013-06-19 | 上海东升焊接集团有限公司 | Insulated gate bipolar translator (IGBT) driving device |
| CN103427607A (en) * | 2012-05-21 | 2013-12-04 | 永济新时速电机电器有限责任公司 | Driving circuit of insulated gate bipolar transistor |
| CN104682678A (en) * | 2014-12-26 | 2015-06-03 | 深圳青铜剑电力电子科技有限公司 | Isolation power supply for IGBT (Insulated Gate Bipolar Transistor) driving |
| CN205725509U (en) * | 2016-04-29 | 2016-11-23 | 摩族新能源技术（深圳）有限公司 | A kind of floating grid drives the insulating power supply circuit of power supply |
-
2016
- 2016-04-29 CN CN201610284017.3A patent/CN105871237A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222744B1 (en) * | 1999-03-19 | 2001-04-24 | General Electronics Applications, Inc. | Isolated power supply circuit for a floating gate driver |
| US20090200981A1 (en) * | 2007-08-24 | 2009-08-13 | Lumsden John L | System and method for providing constant loading in ac power applications |
| CN103166614A (en) * | 2011-12-12 | 2013-06-19 | 上海东升焊接集团有限公司 | Insulated gate bipolar translator (IGBT) driving device |
| CN103427607A (en) * | 2012-05-21 | 2013-12-04 | 永济新时速电机电器有限责任公司 | Driving circuit of insulated gate bipolar transistor |
| CN104682678A (en) * | 2014-12-26 | 2015-06-03 | 深圳青铜剑电力电子科技有限公司 | Isolation power supply for IGBT (Insulated Gate Bipolar Transistor) driving |
| CN205725509U (en) * | 2016-04-29 | 2016-11-23 | 摩族新能源技术（深圳）有限公司 | A kind of floating grid drives the insulating power supply circuit of power supply |
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