CN114070020A - RCD energy feedback type self-powered power switch tube driving circuit - Google Patents

RCD energy feedback type self-powered power switch tube driving circuit Download PDF

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Publication number
CN114070020A
CN114070020A CN202111580131.8A CN202111580131A CN114070020A CN 114070020 A CN114070020 A CN 114070020A CN 202111580131 A CN202111580131 A CN 202111580131A CN 114070020 A CN114070020 A CN 114070020A
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CN
China
Prior art keywords
power switch
switch tube
resistor
circuit
capacitor
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Pending
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CN202111580131.8A
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Chinese (zh)
Inventor
侯典立
李卫民
孟庆燕
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Shandong Zhongke Advanced Technology Research Institute Co ltd
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Shandong Zhongke Advanced Technology Research Institute Co ltd
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Priority to CN202111580131.8A priority Critical patent/CN114070020A/en
Publication of CN114070020A publication Critical patent/CN114070020A/en
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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
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/096—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the power supply of the control circuit being connected in parallel to the main switching element
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to an RCD energy feedback type self-powered power switch tube driving circuit, which comprises a power switch tube, an RCD absorption circuit, a buck circuit with negative pressure output and a power switch tube driving circuit, wherein the power switch tube is connected with the RCD absorption circuit; the RCD absorption circuit is connected with two ends of the power switch tube in parallel, the input of the buck circuit with negative pressure output is connected to two ends of the capacitor of the RCD absorption circuit in parallel, the output of the buck circuit with negative pressure output is connected with the input of the power switch tube driving circuit, and the output of the power switch tube driving circuit is connected with the gate pole of the power switch tube; the RCD absorption line is used for absorbing the overshoot voltage of the power switch tube and storing energy through a capacitor in the RCD absorption line; the buck line with a negative voltage output is used for converting the energy stored in the RCD absorption line into a positive voltage and a negative voltage for driving the power switching tube; the power switch tube driving circuit is used for driving the power switch tube. The invention improves the stability of the power switch tube.

Description

RCD energy feedback type self-powered power switch tube driving circuit
Technical Field
The invention relates to the field of power electronics, in particular to an RCD energy feedback type self-powered power switch tube driving circuit.
Background
The performance of the power converter is largely limited by the switching performance of a power switch tube MOSFET/IGBT (MOSFET: metal-oxide-semiconductor field effect transistor; IGBT: insulated gate bipolar transistor), so that the drive circuit of the MOSFET/IGBT plays a significant role in power electronic systems. The reliability improvement of the power tube is mainly started from the aspects of preventing overvoltage, overcurrent and reliable shutoff.
The overvoltage problem, mainly the voltage overshoot caused by inductive elements under the condition of normal working voltage meeting the design requirements, is that voltage spikes are absorbed by RCD (resistor, capacitor and diode) circuits in various circuit topologies at present, and energy in the capacitor is consumed by the resistor when a tube is conducted, so that the voltage spikes at two ends of a switching tube are reduced, but the problems caused by the resistor are that the resistor generates heat and the system efficiency is low.
The overcurrent problem causes the damage of the device when the current of the conducting device of the switching tube is overlarge.
The power supply problem of the driving circuit is that the driving circuit of the power switch tube is usually independently used for supplying power due to the problem of floating ground and the interference of power to signals, the main modes adopted at present are a special power supply circuit and a bootstrap power supply circuit, as shown in fig. 2 and fig. 3, the special power supply circuit is usually required to be isolated, the auxiliary power supply circuit is increasingly complex due to the increase of the switch tubes, the requirement of auxiliary power supply is reduced to a certain extent by bootstrap power supply, the circuit is still complex, the supply voltage is changed along with the change of the pulse width of the switch tube, and the voltage is not stable enough.
Disclosure of Invention
The invention aims to provide an RCD energy feedback type self-powered power switch tube driving circuit, which improves the stability of a power switch tube.
In order to achieve the purpose, the invention provides the following scheme:
an RCD energy-feedback type self-powered power switch tube driving circuit comprises a power switch tube, an RCD absorption circuit, a buck circuit with negative pressure output and a power switch tube driving circuit;
the RCD absorption circuit is connected with two ends of the power switch tube in parallel, the input of the buck circuit with negative pressure output is connected to two ends of the RCD absorption circuit capacitor in parallel, the output of the buck circuit with negative pressure output is connected with the input of the power switch tube driving circuit, and the output of the power switch tube driving circuit is connected with a gate pole of the power switch tube;
the RCD absorption line is used for absorbing the overshoot voltage of the power switch tube and storing energy through a capacitor in the RCD absorption line; the buck line with the negative voltage output is used for converting the energy stored in the RCD absorption line into positive voltage and negative voltage for driving the power switch tube; the power switch tube driving circuit is used for driving the power switch tube.
Optionally, the RCD absorption line includes a resistor R1, a capacitor C1, and a diode D1, an anode of the diode D1 is connected to the first pole of the power switch, a cathode of the diode D1 is connected to the first end of the capacitor C1 and the first end of the resistor R1, respectively, and the second end of the capacitor C1, the second end of the resistor R1, and the second pole of the power switch are all grounded.
Optionally, the buck circuit with the negative voltage output comprises a switching tube Q1, a diode D2, a voltage regulator tube D3, an inductor L1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a capacitor C14, a first operational amplifier and a second operational amplifier;
a first pole of the switch Q1 is connected to a first end of the resistor R1, a second pole of the switch Q1 is connected to a negative pole of the diode D2 and a first end of the inductor L1, a gate of the switch Q1 is connected to an output end of the second operational amplifier, an anode of the diode D2 is connected to an anode of the voltage regulator D3 and a first end of the capacitor C2, a second end of the inductor L1 is connected to a first end of the capacitor C3, a first end of the resistor R2 and a first end of the capacitor C14, a second end of the resistor R2 is connected to a first end of the resistor R3 and a first input end of the first operational amplifier, a reference voltage is input to a second input end of the first operational amplifier, an output end of the first operational amplifier is connected to a first input end of the second operational amplifier, a preset sawtooth wave is input to a second input end of the second operational amplifier, the negative electrode of the voltage regulator tube D3, the second end of the capacitor C2, the second end of the capacitor C3 and the second end of the resistor R3 are all grounded.
Optionally, the power switching tube driving circuit is a push-pull driving circuit.
Optionally, the push-pull drive line comprises a square wave signal, a transistor Q6 and a transistor Q8; the transistor Q6 is an NPN transistor, and the transistor Q8 is a PNP transistor; the square wave signal is connected with the common base electrodes of the transistor Q6 and the transistor Q8, the collector electrode of the transistor Q6 is connected with the first end of the capacitor C14, the collector electrode of the transistor Q8 is connected with the first end of the capacitor C2, and the emitter electrode of the transistor Q6 and the emitter electrode of the transistor Q8 are both connected with the gate electrode of the power switch tube.
Optionally, the driving current-limiting protection circuit further comprises a resistor R7, a resistor R16, a resistor R11, a voltage regulator tube D5, and a voltage regulator tube D7; a first end of the resistor R7 is connected with an emitter of the transistor Q6, a first end of the resistor R16 is connected with an emitter of the transistor Q8, and a second end of the resistor R7 and a second end of the resistor R16 are both connected with gates of the power switching tubes; the first end of the resistor R11 and the cathode of the voltage regulator tube D5 are both connected with the gate pole of the power switch tube, the anode of the voltage regulator tube D5 is connected with the anode of the voltage regulator tube D7, and the second end of the resistor R11 and the cathode of the voltage regulator tube D7 are both grounded.
Optionally, the power switch tube is an IGBT.
Optionally, the power switch tube is a MOSFET.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, the RCD absorption line absorbs the overshoot voltage of the power switch tube, the RCD absorption line stores energy through the capacitor in the RCD absorption line, and the buck line with negative voltage output converts the energy stored in the RCD absorption line into the positive voltage and the negative voltage for driving the power switch tube, so that the stability of the power supply voltage of the power switch tube is improved, the energy consumption and the heat generation of the RCD absorption line are reduced, and the energy utilization efficiency of the circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic diagram of a RCD energy feedback type self-powered power switching tube driving circuit according to the present invention;
FIG. 2 is a schematic diagram of a power supply circuit dedicated to a power switching tube;
fig. 3 is a schematic diagram of a bootstrap power supply circuit of the power switch tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an RCD energy feedback type self-powered power switch tube driving circuit, which improves the stability of a power switch tube.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of an RCD energy feedback type self-powered power switch tube driving circuit according to the present invention, and as shown in fig. 1, an RCD energy feedback type self-powered power switch tube driving circuit includes a power switch tube, an RCD absorption line 101, a buck line 102 having a negative voltage output, and a power switch tube driving line 103.
The RCD absorption line 101 is connected with two ends of the power switch tube in parallel, the input of the buck line 102 with negative pressure output is connected to two ends of the capacitor of the RCD absorption line 101 in parallel, the output of the buck line 102 with negative pressure output is connected with the input of the power switch tube driving line 103, and the output of the power switch tube driving line 103 is connected with the gate pole of the power switch tube.
The RCD absorption line 101 is used for absorbing the overshoot voltage of the power switch tube and storing energy through a capacitor in the RCD absorption line 101; the buck line 102 with a negative voltage output is used for converting the energy stored in the RCD absorption line 101 into a positive voltage and a negative voltage for driving the power switch tube; the power switch tube driving circuit 103 is used for driving the power switch tube.
The power switch tube is IGBT or MOSFET.
The RCD absorption circuit 101 is applied to various topologies of a power converter, in order to reduce voltage overshoot at two ends (between a drain electrode and a source electrode of an MOSFET (metal-oxide-semiconductor field effect transistor), and between a collector electrode and an emitter electrode of an IGBT (insulated gate bipolar transistor)) of a power switching tube brought by inductive load in each topological structure, the RCD absorption circuit 101 is mainly adopted to reduce the voltage overshoot, instantaneous voltage overshoot is generated when the power switching tube is turned off, at the moment, a diode is conducted to charge a capacitor, the voltage overshoot is reduced through the non-abrupt change characteristic of the instantaneous voltage of the capacitor, the energy of voltage spike is absorbed, and the soft turn-off of the switching tube is further realized; when the switch tube is conducted, the diode is cut off, and the capacitor discharges through the resistor, so that the capacitor returns to low voltage or zero voltage.
The buck circuit 102 with the negative voltage output is a double-output buck circuit, the input end of the buck circuit 102 with the negative voltage output is connected in parallel with two ends of the capacitor of the RCD absorption circuit 101, the resistance value is increased or the resistance is removed, and the energy stored by the capacitor is released through the buck circuit.
The buck line 102 with negative voltage output obtains the stable positive voltage required by the power switch tube driving line 103 at the output end through feedback.
The buck circuit 102 with negative voltage output, the reverse series voltage stabilizing tube under the fly-wheel diode and the capacitor parallel circuit, when the switch tube is turned off and the fly-wheel diode is turned on, the negative voltage which is in common with the positive voltage is obtained at the two ends of the voltage stabilizing tube, and the voltage is kept through the capacitor.
The power switch tube driving circuit 103 mainly adopts a push-pull driving circuit, the upper end of the push-pull driving circuit is connected with the positive output voltage of the buck circuit 102 with negative voltage output, the lower end of the push-pull driving circuit is connected with the negative voltage of the buck circuit 102 with negative voltage output, the middle of two transistors of the push-pull driving circuit is connected with a gate pole of the power switch tube through a resistor, and a common base electrode of the push-pull driving circuit is connected with an input square wave signal.
When the input square wave signal is at a low level, the lower transistor of the push-pull driving circuit is turned on, and the gate of the power switch tube obtains a negative voltage, so that the power switch tube is reliably turned off.
When the input square wave signal is at a high level, the upper transistor of the push-pull driving circuit is turned on, and the gate of the power switch tube obtains a positive voltage, so that the power switch tube is effectively turned on.
The RCD absorption line 101 comprises a resistor R1, a capacitor C1 and a diode D1, wherein the anode of the diode D1 is connected with the first pole of the power switch tube, the cathode of the diode D1 is respectively connected with the first end of the capacitor C1 and the first end of the resistor R1, and the second end of the capacitor C1, the second end of the resistor R1 and the second pole of the power switch tube are all grounded.
The buck circuit 102 with negative voltage output comprises a switching tube Q1, a diode D2, a voltage regulator tube D3, an inductor L1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a capacitor C14, a first operational amplifier and a second operational amplifier;
a first pole of a switch tube Q1 is connected with a first end of a resistor R1, a second pole of a switch tube Q1 is respectively connected with a negative pole of a diode D2 and a first end of an inductor L1, a gate pole of the switch tube Q1 is connected with an output end of a second operational amplifier, an anode of a diode D2 is respectively connected with a positive pole of a voltage regulator tube D3 and a first end of a capacitor C2, a second end of an inductor L1 is respectively connected with a first end of the capacitor C3, a first end of a resistor R2 and a first end of the capacitor C14, a second end of a resistor R2 is respectively connected with a first end of a resistor R3 and a first input end of a first operational amplifier, a second input end of the first operational amplifier inputs a reference voltage, an output end of the first operational amplifier is connected with a first input end of a second operational amplifier, a second input end of the second operational amplifier inputs a preset sawtooth wave and a negative pole of a voltage regulator tube D3, the second terminal of the capacitor C2, the second terminal of the capacitor C3, and the second terminal of the resistor R3 are all grounded.
The push-pull driving circuit comprises a square wave signal, a transistor Q6 and a transistor Q8; the transistor Q6 is an NPN transistor, and the transistor Q8 is a PNP transistor; the square wave signal is connected with the common base electrodes of the transistor Q6 and the transistor Q8, the collector electrode of the transistor Q6 is connected with the first end of the capacitor C14, the collector electrode of the transistor Q8 is connected with the first end of the capacitor C2, and the emitter electrode of the transistor Q6 and the emitter electrode of the transistor Q8 are both connected with the gate electrode of the power switching tube.
The RCD energy-feeding self-powered power switch tube driving circuit further comprises a driving current-limiting protection circuit 104, wherein the driving current-limiting protection circuit 104 comprises a resistor R7, a resistor R16, a resistor R11, a voltage regulator tube D5 and a voltage regulator tube D7; the first end of the resistor R7 is connected with the emitter of the transistor Q6, the first end of the resistor R16 is connected with the emitter of the transistor Q8, and the second end of the resistor R7 and the second end of the resistor R16 are both connected with the gate of the power switch tube; the first end of the resistor R11 and the cathode of the voltage regulator tube D5 are both connected with the gate pole of the power switch tube, the anode of the voltage regulator tube D5 is connected with the anode of the voltage regulator tube D7, and the second end of the resistor R11 and the cathode of the voltage regulator tube D7 are both grounded.
As shown in fig. 1, a resistor R1 and a capacitor C1 in the RCD absorption line 101 are connected in parallel and then connected in series with a diode D1; when the MOSFET switching tube M1 is switched off, the diode D1 is switched on, the capacitor C1 enables the voltage between the drain and the source of the MOSFET switching tube M1 to slowly rise, the purpose of soft switching-off is achieved, voltage overshoot between the drain and the source is restrained, and the capacitor C1 stores energy; when the switch M1 is turned on, the diode D1 is turned off, the capacitor C1 discharges most of the energy through the buck line 102 with a negative voltage output, and the excess energy is dissipated as a resistor.
The buck circuit 102 with negative pressure output consists of a traditional buck circuit, a feedback circuit and a negative pressure generating circuit; the traditional buck circuit consists of a switching tube Q1, a diode D2, an inductor L1 and a capacitor C3; by modulating the switching tube Q1, the diode D2 carries out follow current on the inductor L1, and the required positive voltage is obtained after the follow current is filtered by the inductor L1 and the capacitor C1; the feedback circuit consists of a voltage sampling part, a deviation setting part, a pulse width waveform generation part and a switch tube Q1 driving part, wherein the switch tube Q1 is driven by the driving circuit in the figure 1; voltage sampling is realized by voltage division of a resistor R2 and a resistor R3, deviation setting is realized by an operational amplifier and a reference voltage, and PI link, then a pulse width modulation waveform is obtained by comparison of the operational amplifier and a sawtooth wave, and finally a switching tube Q1 is driven by a driving circuit.
The buck circuit 102 with the negative voltage output function is characterized in that the negative voltage generating part comprises a voltage regulator tube D3 and a capacitor C2, the voltage regulator tube D3 is connected with the capacitor C2 in parallel and then is connected with a freewheeling diode D2 in a reverse series mode, when a diode D2 is conducted, the voltage regulator tube D3 has enough current for voltage regulation, and when the capacitor C2 stores energy, the push-pull driving circuit has enough negative voltage to turn off a power switch tube M1.
The push-pull driving circuit is formed by connecting an upper NPN transistor Q6 and a lower PNP transistor Q8, a collector of the transistor Q6 is connected with a positive voltage output by a buck line 102 with a negative voltage output, an emitter of the transistor Q8 is connected with a negative voltage output by the buck line 102 with the negative voltage output, when a driving signal is at a high level, Q6 is conducted, the push-pull line outputs the positive voltage, so that the power switch tube M1 is effectively conducted, and when the driving signal is at a low level, Q8 is conducted, and the push-pull circuit outputs the negative voltage, so that the power switch tube M1 is reliably turned off.
The driving current-limiting protection circuit 104 comprises a current-limiting resistor R7, a current-limiting resistor R16, a pull-down resistor R11, a clamping voltage regulator D5 and a clamping voltage regulator D7. The current limiting resistors R7 and R16 prevent the driving current from generating oscillation due to overlarge current, R7 is responsible for limiting the current when the power switch tube M1 is switched on, and the resistor R16 is responsible for limiting the gate current when the power switch tube M1 is switched off; the pull-down resistor R11 enables the power switch tube to be in an off state by default when no driving signal exists; the clamping voltage regulators D5 and D7 prevent the overvoltage of positive and negative voltages of the grid of the power switch tube from damaging the switch tube.
In fig. 1, V1 and V2 each denote a square wave signal generator, and Vref denotes a reference voltage.
The above is the description of the device in the upper half of fig. 1, and the lower half of fig. 1 also includes an RCD energy-feeding self-powered switching tube driving circuit, which has the same principle as the upper half of fig. 1, wherein the RCD absorption circuit includes a diode D9, a capacitor C5 and a resistor R4; the buck circuit with negative voltage output comprises a switching tube Q2, a diode D10, a voltage regulator tube D11, an inductor L2, a capacitor C6, a capacitor C7, a resistor R5, a resistor R6, a capacitor C8, a third operational amplifier and a fourth operational amplifier; the push-pull driving circuit comprises a square wave signal, a transistor Q7 and a transistor Q8; the driving current-limiting protection circuit comprises a current-limiting resistor R8, a current-limiting resistor R17, a pull-down resistor R9, a clamping voltage regulator tube D6 and a clamping voltage regulator tube D8.
As shown in fig. 2, each switching tube needs a dedicated power supply line, needs more power supply lines, and has unstable negative voltage, which changes with the change of pulse width, as shown in fig. 3, a bootstrap power supply mode is adopted; the number of auxiliary power supply circuits is reduced, but the positive voltage and the negative voltage of the upper tube driving power supply can change along with the change of the pulse width, and the stability is not high enough.
The RCD energy feedback type self-powered power switch tube driving circuit is an energy feedback type power supply circuit, effectively solves the problems of complexity of a traditional special power supply circuit and unstable bootstrap power supply voltage, and ensures the reliability of power tube shutoff by adopting negative voltage shutoff; and effectively avoided RCD circuit power consumption problem of generating heat, further improved system efficiency.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. An RCD energy-feedback type self-powered power switch tube driving circuit is characterized by comprising a power switch tube, an RCD absorption circuit, a buck circuit with negative pressure output and a power switch tube driving circuit;
the RCD absorption circuit is connected with two ends of the power switch tube in parallel, the input of the buck circuit with negative pressure output is connected to two ends of the RCD absorption circuit capacitor in parallel, the output of the buck circuit with negative pressure output is connected with the input of the power switch tube driving circuit, and the output of the power switch tube driving circuit is connected with a gate pole of the power switch tube;
the RCD absorption line is used for absorbing the overshoot voltage of the power switch tube and storing energy through a capacitor in the RCD absorption line; the buck line with the negative voltage output is used for converting the energy stored in the RCD absorption line into positive voltage and negative voltage for driving the power switch tube; the power switch tube driving circuit is used for driving the power switch tube.
2. The RCD energy-feeding self-powered power switch tube driving circuit according to claim 1, wherein the RCD absorption line comprises a resistor R1, a capacitor C1 and a diode D1, wherein an anode of the diode D1 is connected to a first pole of the power switch tube, a cathode of the diode D1 is connected to a first end of the capacitor C1 and a first end of the resistor R1, respectively, and a second end of the capacitor C1, a second end of the resistor R1 and a second pole of the power switch tube are all grounded.
3. The RCD energy-feedback self-powered power switch tube driving circuit as claimed in claim 2, wherein the buck circuit with negative voltage output comprises a switch tube Q1, a diode D2, a voltage regulator tube D3, an inductor L1, a capacitor C2, a capacitor C3, a resistor R2, a resistor R3, a capacitor C14, a first operational amplifier and a second operational amplifier;
a first pole of the switch Q1 is connected to a first end of the resistor R1, a second pole of the switch Q1 is connected to a negative pole of the diode D2 and a first end of the inductor L1, a gate of the switch Q1 is connected to an output end of the second operational amplifier, an anode of the diode D2 is connected to an anode of the voltage regulator D3 and a first end of the capacitor C2, a second end of the inductor L1 is connected to a first end of the capacitor C3, a first end of the resistor R2 and a first end of the capacitor C14, a second end of the resistor R2 is connected to a first end of the resistor R3 and a first input end of the first operational amplifier, a reference voltage is input to a second input end of the first operational amplifier, an output end of the first operational amplifier is connected to a first input end of the second operational amplifier, a preset sawtooth wave is input to a second input end of the second operational amplifier, the negative electrode of the voltage regulator tube D3, the second end of the capacitor C2, the second end of the capacitor C3 and the second end of the resistor R3 are all grounded.
4. The RCD energy-fed self-powered power switching tube drive circuit of claim 3, wherein the power switching tube drive circuit is a push-pull drive circuit.
5. The RCD energy-fed self-powered power switching tube drive circuit of claim 4, wherein the push-pull drive line comprises a square wave signal, a transistor Q6 and a transistor Q8; the transistor Q6 is an NPN transistor, and the transistor Q8 is a PNP transistor; the square wave signal is connected with the common base electrodes of the transistor Q6 and the transistor Q8, the collector electrode of the transistor Q6 is connected with the first end of the capacitor C14, the collector electrode of the transistor Q8 is connected with the first end of the capacitor C2, and the emitter electrode of the transistor Q6 and the emitter electrode of the transistor Q8 are both connected with the gate electrode of the power switch tube.
6. The RCD energy-feeding self-powered power switch tube driving circuit as claimed in claim 5, further comprising a driving current-limiting protection circuit, wherein the driving current-limiting protection circuit comprises a resistor R7, a resistor R16, a resistor R11, a voltage regulator tube D5 and a voltage regulator tube D7; a first end of the resistor R7 is connected with an emitter of the transistor Q6, a first end of the resistor R16 is connected with an emitter of the transistor Q8, and a second end of the resistor R7 and a second end of the resistor R16 are both connected with gates of the power switching tubes; the first end of the resistor R11 and the cathode of the voltage regulator tube D5 are both connected with the gate pole of the power switch tube, the anode of the voltage regulator tube D5 is connected with the anode of the voltage regulator tube D7, and the second end of the resistor R11 and the cathode of the voltage regulator tube D7 are both grounded.
7. The RCD energy-fed self-powered power switching tube driver circuit of claim 1, wherein the power switching tube is an IGBT.
8. The RCD energy-fed self-powered power switching tube driver circuit of claim 1, wherein the power switching tube is a MOSFET.
CN202111580131.8A 2021-12-22 2021-12-22 RCD energy feedback type self-powered power switch tube driving circuit Pending CN114070020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111580131.8A CN114070020A (en) 2021-12-22 2021-12-22 RCD energy feedback type self-powered power switch tube driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111580131.8A CN114070020A (en) 2021-12-22 2021-12-22 RCD energy feedback type self-powered power switch tube driving circuit

Publications (1)

Publication Number Publication Date
CN114070020A true CN114070020A (en) 2022-02-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111580131.8A Pending CN114070020A (en) 2021-12-22 2021-12-22 RCD energy feedback type self-powered power switch tube driving circuit

Country Status (1)

Country Link
CN (1) CN114070020A (en)

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