CN109462322B - Isolated drive and isolated power supply two-in-one circuit - Google Patents
Isolated drive and isolated power supply two-in-one circuit Download PDFInfo
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- CN109462322B CN109462322B CN201811278960.9A CN201811278960A CN109462322B CN 109462322 B CN109462322 B CN 109462322B CN 201811278960 A CN201811278960 A CN 201811278960A CN 109462322 B CN109462322 B CN 109462322B
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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
- 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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Abstract
The invention discloses an isolation drive and isolation power supply two-in-one circuit, which comprises an isolation transmission unit, a first isolation power extraction unit and a second isolation signal extraction unit, wherein the isolation transmission unit is used for transmitting a first isolation power supply to the first isolation power supply; the isolation transmission unit comprises an isolation transformer with a primary coil arranged on the primary side, the primary coil inputs a signal obtained by modulating a carrier frequency signal by a modulation signal, and the secondary side of the isolation transformer comprises a first isolation coil and a second isolation coil; the same-name end of the first isolation coil is connected with a first isolation power extraction unit and a first isolation signal extraction unit; the non-homonymous end of the second isolation coil is connected with a second isolation power extraction unit and a second isolation signal extraction unit; the isolation signals of the first isolation signal extraction unit and the second isolation signal extraction unit are modulation carrier frequency signals, and the isolation power supplies of the first isolation power supply extraction unit and the second isolation power supply extraction unit are electric energy of the modulation carrier frequency signals, so that the isolation of the control pulse power supply can be realized by one isolation transformer.
Description
Technical Field
The invention relates to the technical field of welding driving, in particular to an isolation driving and isolation power supply two-in-one circuit.
Background
In TIG welding of aluminum and its alloy, the surface of aluminum material will react with oxygen in air to produce oxide film with melting point far higher than that of aluminum material, and for example, in positive polarity DC TIG welding, the surface of molten pool is covered with oxide film to meet the requirement of welding process and the welding is impossible. When the negative polarity connection method is adopted, the tungsten rod is the positive pole, electrons are emitted from the workpiece to the tungsten pole, and the effect of cleaning an oxide film is achieved, but the burning loss of the tungsten pole is serious, and the weld penetration is not enough, so that the alternating current arc is adopted for welding, the current carrying capacity of the tungsten pole is improved by utilizing the different actions of positive and negative half waves of the alternating current arc, the larger penetration is obtained, and meanwhile, the sufficient oxide film cleaning capacity is achieved, so that the welding can be normally carried out. The existing TIG welding machine for welding aluminum alloy is provided with a secondary inverter circuit for converting low-voltage direct current obtained by the primary inverter circuit into low-frequency alternating current with the frequency of 50-150 HZ.
In the prior art, most alternating current TIG welding machines adopt a secondary inverter circuit as shown in fig. 2, adopt a half-bridge or full-bridge circuit to perform current phase change, use IGBT single tubes or IGBT modules to be connected in parallel to realize large current control, four IGBT single tubes of Q2, Q3, Q4 and Q5 in fig. 2 are connected in parallel to form an upper bridge arm, and four IGBT single tubes of Q7, Q8, Q9 and Q10 form a lower bridge arm, and output current through a center tap of a secondary side of a main inverter transformer. Because the upper bridge arm and the lower bridge arm of the secondary inverter circuit are not grounded together, the two driving signals must be isolated, and the reference ground potential of the driving signal of the upper bridge arm and the reference ground potential of the driving signal of the lower bridge arm cannot be electrically connected. In the figure 1, two isolated power supplies are adopted for supplying power, U3 is a driving chip of an upper bridge arm IGBT, a power supply pin of the driving chip is 1 pin, a power supply pin of the driving chip is 8 pins, a grounding pin of the driving chip is 4 pin, a grounding pin of the driving chip is 5 pin, U6 is a driving chip of a lower bridge arm IGBT, a U6 chip is the same as a U3 chip, and in order to achieve ground potential isolation, two DC-DC modules are adopted for generating two isolated power supplies VC1, GND1, VC2 and GND2 which respectively supply power to U3 and U6.
In order to realize isolation driving, besides the need of power isolation, two paths of trigger pulse A and trigger pulse B with the phase difference of 180 degrees provided by a control circuit also need to be isolated and transmitted through two optical couplers U2 and U5, and the overall cost of the existing scheme is higher due to the fact that the internal circuit of a DC-DC module is complex and high in cost and the cost of the optical couplers is higher, and the competitiveness of products is weakened for welding machine products with higher and higher competitive cost pressure.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an isolation driving and isolation power supply two-in-one circuit which has the advantage of low circuit cost and can obviously improve the market competitiveness of products.
In order to achieve the purpose, the invention provides the following technical scheme:
an isolation drive and isolation power supply two-in-one circuit comprises an isolation transmission unit, a first isolation power extraction unit and a second isolation unit
The power isolation device comprises an off-power extraction unit, a first isolation signal extraction unit and a second isolation signal extraction unit, wherein the first isolation power extraction unit and the second isolation power extraction unit are respectively provided with a power input end and a power output end, the power output end is used for outputting an isolation power, the second isolation power extraction unit is identical to the first isolation power extraction unit in circuit structure, the first isolation signal extraction unit and the second isolation signal extraction unit are respectively provided with a signal input end and a signal output end, the signal output end is used for outputting an isolation signal, and the second isolation signal extraction unit is identical to the first isolation signal extraction unit in circuit structure;
the isolation transmission unit comprises an isolation transformer, a primary side of the isolation transformer is provided with a primary coil, the primary coil is input with a signal obtained by modulating a carrier frequency signal by a modulation signal, and a secondary side of the isolation transformer comprises a first isolation coil and a second isolation coil;
the dotted end of the first isolation coil is electrically connected with the power input end of the first isolation power extraction unit, and the dotted end of the first isolation coil is electrically connected with the signal input end of the first isolation signal extraction unit;
the homonymous end of the second isolation coil is opposite to the first isolation coil, the homonymous end of the second isolation coil is connected with the ground potential, the non-homonymous end of the second isolation coil is electrically connected with the power input end of the second isolation power extraction unit, and the non-homonymous end of the second isolation coil is electrically connected with the signal input end of the second isolation signal extraction unit; the isolation signals output by the first isolation signal extraction unit and the second isolation signal extraction unit are modulation carrier frequency signals, and the isolation power supplies output by the first isolation power supply extraction unit and the second isolation power supply extraction unit are electric energy of the modulation carrier frequency signals.
Through the technical scheme, the isolation transmission unit is used for isolating and transmitting the modulation signal, the first isolation power extraction unit extracts the energy in the carrier frequency signal to provide power for the driving chip, the second isolation signal extraction unit extracts the modulation signal in the modulation signal to provide control pulse for the driving chip, the isolation of the control pulse and the isolation of the power supply can be realized by using an isolation transformer, an additional DC-DC isolation power supply and an isolation optical coupler are not needed, and the cost is saved.
Further, the frequency of the carrier frequency signal is greater than that of the modulation signal, and the frequency of the isolation signal is equal to that of the modulation signal.
Through the technical scheme, the carrier frequency is modulated by the modulation signal, so that the signal transmitted by the isolation transformer can provide a power supply and can transmit a pulse signal.
Furthermore, the first isolation power extraction unit and the second isolation power extraction unit both comprise a first rectifier diode, a first resistor and a first voltage regulator diode, the cathode of the first rectifier diode is electrically connected with the cathode of the first voltage regulator diode through the first resistor, and two ends of the first voltage regulator diode are connected in parallel with a filter capacitor;
the anode of the first voltage stabilizing diode is grounded;
the positive pole of the first rectifier diode is the power input end, and the negative pole of the first voltage stabilizing diode is the power output end.
According to the technical scheme, the alternating current in the coil is rectified into the direct current by the first rectifying diode, the direct current outputs a direct current power supply through the first voltage stabilizing diode, the first resistor limits the current, and the filter capacitor increases the quality of the direct current power supply.
Further, the first isolation signal extraction unit comprises a second rectifier diode, a second resistor, an extraction capacitor and an extraction resistor, wherein the cathode of the second rectifier diode is electrically connected with the extraction capacitor through the second resistor, and the extraction resistor is connected with the extraction capacitor in parallel;
one end of the extraction capacitor far away from the second resistor is grounded;
the positive pole of the second rectifier diode is the signal input end, and the connection point of the extraction capacitor and the second resistor is the signal output end.
According to the technical scheme, the rectifier diode rectifies alternating current in the coil into direct current with modulation pulses, and the pulse direct current outputs modulation signals through the extraction capacitor and the extraction resistor.
Further, the power input end connected to one coil of the secondary side of the isolation transformer is electrically connected to the signal input end.
Through the technical scheme, the filter time constant of the first isolation power extraction unit is determined by the resistor and the filter capacitor, the filter time constant of the first isolation signal extraction unit is determined by the resistor and the extraction capacitor, and the difference of the filter time constants of the first isolation power extraction unit and the extraction capacitor is large, so that the modulation signal can be separated from the carrier frequency signal.
Furthermore, the power output end and the signal output end which are connected with the same coil of the secondary side of the isolation transformer are connected with the same driving chip.
Through the technical scheme, the first isolation coil and the second isolation coil are respectively connected with the driving chips which are not the same and have the same model, so that the electric isolation among the driving chips is realized.
Further, the number of turns of the first isolation coil is the same as that of the second isolation coil.
Through the technical scheme, the amplitude of the direct-current power supply provided by the first isolation coil and the amplitude of the direct-current power supply provided by the second isolation coil are consistent with the amplitude of the pulse signal.
Further, the phase sequence of the isolation signal output by the signal output end in the first isolation coil and the phase sequence of the isolation signal output by the signal output end in the second isolation coil are different by 180 degrees.
Through the technical scheme, the first isolation coil and the second isolation coil can drive the driving chips with the same type, and the working states of the driving chips are opposite.
Compared with the prior art, the invention has the beneficial effects that: the isolation transmission unit is used for transmitting modulation signals in an isolation mode, and the first isolation coil and the second isolation coil are respectively connected with different drive chips with the same type and are not the same, so that the electrical isolation among the drive chips is realized; the first isolation power extraction unit extracts energy in the carrier frequency signal to provide power for the driving chip, the first isolation signal extraction unit extracts a modulation signal in the modulation signal to provide control pulse for the driving chip, the filter time constant of the isolation power extraction unit is determined by a resistor and a filter capacitor, the filter time constant of the first isolation signal extraction unit is determined by the resistor and the extraction capacitor, and the filter time constants of the first isolation signal extraction unit and the filter capacitor are greatly different, so that the modulation signal can be separated from the carrier frequency signal; the isolation of the control pulse and the isolation of the power supply can be realized by using one isolation transformer, and a separated DC-DC isolation power supply and an isolation optocoupler are not needed, so that the cost is saved.
Drawings
FIG. 1 is a circuit diagram of an isolated power supply circuit of the prior art;
FIG. 2 is a circuit diagram of a secondary inverter circuit in the prior art;
FIG. 3 is a circuit diagram of an embodiment of the present invention;
fig. 4 is a waveform diagram of a modulation signal and a carrier frequency signal according to an embodiment of the invention.
Reference numerals: 100. an isolated transfer unit; 200. a first isolated power extraction unit; 300. a first isolated signal extraction unit; 400. and a driving chip.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Examples
An isolated driving and isolated power supply two-in-one circuit, as shown in fig. 3, includes an isolated transmission unit 100, a first isolated power extraction unit 200, a first isolated signal extraction unit 300, and a second isolated signal extraction unit. The isolation transfer unit 100 includes an isolation transformer T1, a primary winding N1 is disposed on a primary side of the isolation transformer T1, and a modulation signal is input to the primary winding N1, where the modulation signal includes a carrier frequency signal. As shown in fig. 4, the frequency of the carrier signal is greater than the frequency of the modulation signal, and the frequency of the isolation signal is equal to the frequency of the modulation signal. The carrier frequency is modulated by the modulation signal so that the signal delivered by the isolation transformer T1 can deliver both power and a pulsed signal. The frequency of the carrier frequency signal can be 40KHZ, and the frequency of the modulation signal can be 50-120 HZ. The carrier frequency signal and the modulation signal are both square waves.
Returning to fig. 3, the secondary side of the isolation transformer T1 includes a first isolation winding N2 and a second isolation winding N3, and the number of turns of the first isolation winding N2 is the same as that of the second isolation winding N3. The dotted terminal of the first isolation coil N2 is electrically connected to an isolation power extraction unit 200, and the dotted terminal of the first isolation coil N2 is electrically connected to a first isolation signal extraction unit 300. The first isolation coil N2 and the second isolation coil N3 provide dc power in accordance with the amplitude of the pulse signal.
The first isolated power extraction unit 200 and the second isolated power extraction unit both have a power input terminal and a power output terminal for outputting an isolated power. The isolation power extraction unit 200, in which the same-name end of the first isolation coil N2 is electrically connected, includes a rectifier diode D3, a resistor R51, and a zener diode Z1, the cathode of the rectifier diode D3 is electrically connected to the cathode of the zener diode Z1 through a resistor R51, two ends of the zener diode Z1 are connected in parallel to a filter capacitor, and the filter capacitor includes a capacitor C15 and a capacitor C16 that are connected in parallel to each other. The positive electrode of the rectifier diode D3 is electrically connected to the dotted terminal of the first isolation coil N2, and the positive electrode of the zener diode Z1 is electrically connected to the non-dotted terminal of the first isolation coil N2, i.e., the ground potential. The anode of the rectifier diode D1 is a power input terminal, the cathode of the zener diode Z1 is a power output terminal, and the anode of the zener diode Z1 is a power cathode. The rectifier diode D1 rectifies the alternating current in the first isolation coil N2 into direct current, the direct current outputs a direct current power supply through the voltage stabilizing diode Z1, the resistor R51 increases the internal resistance of the circuit, and the filter capacitor increases the quality of the direct current power supply.
The first and second isolated signal extraction units 300 and 300 each have a signal input terminal and a signal output terminal for outputting an isolated signal. The first isolation signal extraction unit 300 with the same-name end of the first isolation coil N2 electrically connected includes a rectifier diode D5, a resistor R58, an extraction capacitor C20 and an extraction resistor R64, the cathode of the rectifier diode D5 is electrically connected to the extraction capacitor C20 through a resistor R58, and the extraction resistor R64 is connected in parallel to the extraction capacitor C20. The anode of the rectifying diode D5 is electrically connected to the dotted terminal of the first isolation coil N2, and the end of the extraction capacitor C20 away from the resistor R58 is electrically connected to the non-dotted terminal of the first isolation coil N2, i.e., the ground potential. The anode of the rectifier diode D5 is a signal input terminal, and the connection point of the extraction capacitor C20 and the resistor R58 is a signal output terminal. The rectifier diode D5 rectifies the alternating current of the first isolation coil N2 into direct current, and the direct current outputs a modulation signal through the extraction capacitor C20 and the extraction resistor R64.
The non-dotted terminal of the second isolation coil N3 is electrically connected to a second isolation power extraction unit, the second isolation power extraction unit has the same circuit structure as the first isolation power extraction unit 200, the non-dotted terminal of the second isolation coil N3 is electrically connected to a second isolation signal extraction unit, and the second isolation signal extraction unit has the same circuit structure as the first isolation signal extraction unit 300. The second isolation power extraction unit electrically connected with the non-dotted terminal of the second isolation coil N3 comprises a rectifier diode D7, a resistor R82 and a voltage stabilizing diode Z2, the cathode of the rectifier diode D7 is electrically connected with the cathode of the voltage stabilizing diode Z2 through a resistor R82, two ends of the voltage stabilizing diode Z2 are connected in parallel with a filter capacitor, and the filter capacitor comprises a capacitor C27 and a capacitor C28 which are connected in parallel with each other. The anode of the rectifier diode D7 is electrically connected to the non-dotted terminal of the second isolation coil N3, and the anode of the zener diode Z2 is electrically connected to the dotted terminal of the second isolation coil N3, i.e., the ground potential. The anode of the rectifier diode D7 is a power input terminal, the cathode of the zener diode Z2 is a power output terminal, and the anode of the zener diode Z2 is a power cathode. The rectifier diode D7 rectifies the alternating current in the second isolation coil N3 into direct current, the direct current outputs a direct current power supply through the voltage stabilizing diode Z2, the resistor R82 increases the internal resistance of the circuit, and the filter capacitor increases the quality of the direct current power supply.
The second isolation signal extraction unit electrically connected with the non-dotted terminal of the second isolation coil N3 comprises a rectifier diode D6, a resistor R76, an extraction capacitor C23 and an extraction resistor R77, wherein the cathode of the rectifier diode D6 is electrically connected with the extraction capacitor C23 through a resistor R76, and the extraction resistor R77 is connected with an extraction capacitor C23 in parallel. The anode of the rectifying diode D6 is electrically connected to the non-dotted terminal of the second isolation coil N3, and the end of the extraction capacitor C23 away from the resistor R76 is electrically connected to the dotted terminal of the second isolation coil N3, i.e., the ground potential. The anode of the rectifier diode D6 is a signal input terminal, and the connection point of the extraction capacitor C23 and the resistor R76 is a signal output terminal. The rectifier diode D6 rectifies the alternating current of the second isolation coil N3 into direct current, and the direct current outputs a modulation signal through the extraction capacitor C23 and the extraction resistor R77.
The power output terminal and the signal output terminal connected to the first isolation coil N2 or the second isolation coil N3 are connected to the same driver chip 400, and the driver chip 400 may be a TC4420 chip. The first isolation coil N2 and the second isolation coil N3 are respectively connected to the driving chips 400 which are not the same and have the same model, so as to realize electrical isolation between the driving chips 400.
The working process of the isolation drive and isolation power supply two-in-one circuit is as follows: the isolation transmission unit 100 is used for isolating and transmitting the carrier frequency signal and the modulation signal, and the isolation transformer T1 transmits the carrier frequency signal and the modulation signal from the primary winding N1 to the first isolation winding N2 and the second isolation winding N3. The filter time constant of the first isolated power extraction unit 200 is determined by a resistor and a filter capacitor, and the filter time constant of the first isolated signal extraction unit 300 is determined by a resistor and an extraction capacitor, which have a large difference in filter time constant, so that the first isolated power extraction unit 200 can extract the power of the carrier frequency signal as a dc power, and the first isolated signal extraction unit 300 can separate the modulation signal from the carrier frequency signal. The power input end in the first isolation coil N2 is electrically connected with the signal input end and the same-name end of the first isolation coil N2, and the power input end in the second isolation coil N3 is electrically connected with the signal input end and the non-same-name end of the second isolation coil N3, so that the phase sequence of the isolation signal output by the signal output end in the first isolation coil N2 and the isolation signal output by the signal output end in the second isolation coil N3 is different by 180 degrees. The first isolation coil N2 and the second isolation coil N3 can drive the driver chip 400 with the same type, and the operation states of the driver chip 400 are opposite.
The first isolation power extraction unit 200 extracts energy in the carrier frequency signal to provide power for the driving chip 400, the first isolation signal extraction unit 300 extracts the modulation signal to provide control pulse for the driving chip 400, isolation of the control pulse and isolation of the power supply can be achieved by using one isolation transformer T1, a separate DC-DC isolation power and an isolation optical coupler are not needed, and cost is saved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. An isolated drive and isolated power supply two-in-one circuit is characterized by comprising an isolated transmission unit (100), a first isolated power extraction unit (200), a second isolated power extraction unit, a first isolated signal extraction unit (300) and a second isolated signal extraction unit, the first isolated power extraction unit (200) and the second isolated power extraction unit each have a power input and a power output, the power output end is used for outputting an isolated power, the circuit structure of the second isolated power extraction unit is the same as that of the first isolated power extraction unit (200), the first isolated signal extraction unit (300) and the second isolated signal extraction unit each have a signal input and a signal output, the signal output end is used for outputting an isolation signal, and the circuit structure of the second isolation signal extraction unit is the same as that of the first isolation signal extraction unit (300);
the isolation transmission unit (100) comprises an isolation transformer, a primary side of the isolation transformer is provided with a primary coil, the primary coil inputs a signal obtained by modulating a carrier frequency signal by a modulation signal, and a secondary side of the isolation transformer comprises a first isolation coil and a second isolation coil;
the dotted terminal of the first isolation coil is electrically connected with the power input terminal of the first isolation power extraction unit (200), the dotted terminal of the first isolation coil is electrically connected with the signal input terminal of the first isolation signal extraction unit (300), and the non-dotted terminal of the first isolation coil is connected with the ground potential;
the homonymous end of the second isolation coil is opposite to the first isolation coil, the homonymous end of the second isolation coil is connected with the ground potential, the non-homonymous end of the second isolation coil is electrically connected with the power input end of the second isolation power extraction unit, and the non-homonymous end of the second isolation coil is electrically connected with the signal input end of the second isolation signal extraction unit;
the isolation signals output by the first isolation signal extraction unit (300) and the second isolation signal extraction unit are modulation signals, and the isolation power supplies output by the first isolation power supply extraction unit (200) and the second isolation power supply extraction unit are electric energy of carrier frequency signals;
the first isolation power extraction unit (200) and the second isolation power extraction unit respectively comprise a first rectifier diode, a first resistor and a first voltage stabilizing diode, the cathode of the first rectifier diode is electrically connected with the cathode of the first voltage stabilizing diode through the first resistor, and two ends of the first voltage stabilizing diode are connected with a filter capacitor in parallel;
the anode of the first voltage stabilizing diode is grounded;
the positive pole of the first rectifier diode is the power input end, and the negative pole of the first voltage stabilizing diode is the power output end.
2. The isolated driver and isolated power supply circuit of claim 1, wherein the carrier frequency signal has a frequency greater than the modulation signal, and the isolated signal has a frequency equal to the modulation signal.
3. The isolated driving and isolated power supply two-in-one circuit according to claim 1, wherein the first isolated signal extraction unit (300) comprises a second rectifying diode, a second resistor, an extraction capacitor and an extraction resistor, wherein the cathode of the second rectifying diode is electrically connected with the extraction capacitor through the second resistor, and the extraction resistor is connected with the extraction capacitor in parallel;
one end of the extraction capacitor far away from the second resistor is grounded;
the positive pole of the second rectifier diode is the signal input end, and the connection point of the extraction capacitor and the second resistor is the signal output end.
4. The isolated driving and isolated power supply circuit as claimed in claim 1, wherein the power output terminal and the signal output terminal connected to the same coil on the secondary side of the isolation transformer are connected to the same driving chip (400).
5. The isolated drive and isolated power supply two-in-one circuit according to claim 1, wherein the number of turns of the first isolation coil is the same as that of the second isolation coil.
6. The isolated driving and isolated power supply two-in-one circuit according to claim 1, wherein the phase sequence of the isolated signal output by the signal output terminal in the first isolation coil is 180 degrees different from the phase sequence of the isolated signal output by the signal output terminal in the second isolation coil.
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| CN201811278960.9A CN109462322B (en) | 2018-10-30 | 2018-10-30 | Isolated drive and isolated power supply two-in-one circuit |
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| CN201811278960.9A CN109462322B (en) | 2018-10-30 | 2018-10-30 | Isolated drive and isolated power supply two-in-one circuit |
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| US5469098A (en) * | 1993-03-29 | 1995-11-21 | Exide Electronics Corporation | Isolated gate drive |
| JP4055115B2 (en) * | 2002-04-04 | 2008-03-05 | 株式会社安川電機 | Gate drive circuit |
| CN101325376B (en) * | 2007-06-15 | 2012-05-02 | 力博特公司 | Drive circuit for switching element |
| CN203243214U (en) * | 2013-05-29 | 2013-10-16 | 深圳市合兴加能科技有限公司 | Frequency conversion device |
| CN107516994B (en) * | 2017-10-10 | 2019-10-25 | 厦门市爱维达电子有限公司 | A kind of self-powered inverter IGBT driving device based on Magnetic isolation |
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