CN114268227B - Power tube driving circuit and system - Google Patents
Power tube driving circuit and system Download PDFInfo
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- CN114268227B CN114268227B CN202111536785.0A CN202111536785A CN114268227B CN 114268227 B CN114268227 B CN 114268227B CN 202111536785 A CN202111536785 A CN 202111536785A CN 114268227 B CN114268227 B CN 114268227B
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- 239000003990 capacitor Substances 0.000 claims description 52
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- 238000004146 energy storage Methods 0.000 description 4
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- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a power tube driving circuit and a power tube driving system, and relates to the technical field of driving. The power tube driving circuit outputs a high-level signal and a low-level signal to the first negative voltage driving circuit through the push-pull circuit according to the received PWM driving signal; the first negative voltage driving circuit stores electric energy when receiving a high-level signal and outputs a positive voltage driving signal to the first power tube so as to conduct the first power tube; the first negative pressure driving circuit releases stored electric energy to generate a negative pressure driving signal when receiving the low level signal, and outputs the negative pressure driving signal to the first power tube so as to cut off the first power tube. The invention outputs positive-pressure driving signals to drive the first power tube to be conducted when outputting high-level signals, and stores electric energy; when a low-level signal is output, the stored electric energy is released, a negative pressure driving signal is formed to drive the first power tube to stop, and reliable driving of the power tube is achieved.
Description
Technical Field
The present invention relates to the field of driving technologies, and in particular, to a power tube driving circuit and system.
Background
As auxiliary power supplies become increasingly adaptable to high voltage high power applications, traditional auxiliary power supply applications have become inadequate. Searching for new power supplies as high-voltage high-power auxiliary power supplies has become necessary. The flyback circuit based on double-tube series connection is suitable for the power supply requirement of an auxiliary power supply of the system under the high-voltage input condition. In order to meet the design requirement, the switching tube needs to adopt a negative-pressure turn-off driving mode, which brings obstacles to the application of the double-tube series flyback circuit.
Aiming at the current power tube flyback auxiliary power supply applicable to high-voltage application conditions, the required power tube is SIC to meet the high-voltage requirement, and at the moment, the SIC is driven by negative voltage to be turned off so as to accurately prevent the wrong conduction. The power taking of the flyback auxiliary power supply of the power tube can only take power from high-voltage input, and accurate control of driving of the power tube is difficult.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a power tube driving circuit and a system, and aims to solve the technical problem that in the prior art, accurate driving of a power tube is difficult.
In order to achieve the above object, the present invention provides a power tube driving circuit, including: a push-pull circuit and a first negative voltage driving circuit;
the first negative pressure driving circuit is connected with the push-pull circuit and the first power tube respectively;
the push-pull circuit is used for outputting a high-level signal and a low-level signal to the first negative-voltage driving circuit according to the received PWM driving signal;
the first negative voltage driving circuit is used for storing electric energy when receiving the high-level signal and outputting a positive voltage driving signal to the first power tube so as to conduct the first power tube;
the first negative pressure driving circuit is further used for releasing stored electric energy to generate a negative pressure driving signal when receiving the low-level signal, and outputting the negative pressure driving signal to the first power tube so as to cut off the first power tube.
Optionally, the power tube driving circuit further includes: a step-down circuit;
the step-down circuit is connected with a direct current bus and a second power tube, and the second power tube is connected with the direct current bus and the first power tube;
and the voltage reducing circuit is used for reducing the bus voltage output by the direct current bus when the first power tube is conducted, and inputting the reduced bus voltage to the second power tube so as to conduct the second power tube.
Optionally, the power tube driving circuit further includes: a second negative pressure driving circuit;
the second negative pressure driving circuit is connected with the voltage reducing circuit and the second power tube respectively;
the step-down circuit is used for inputting the bus voltage after step-down to the second negative-pressure driving circuit when the first power tube is conducted;
the second negative-pressure driving circuit is used for storing electric energy when receiving the reduced bus voltage and outputting a positive-pressure driving signal to the second power tube so as to conduct the second power tube;
the second negative pressure driving circuit is further used for releasing stored electric energy when the first power tube is cut off so as to generate a negative pressure driving signal, and outputting the negative pressure driving signal to the second power tube so as to cut off the second power tube.
Optionally, the push-pull circuit includes: first to second resistors and first to second transistors;
the first end of the first resistor is connected with the output end of the PWM driving signal, the second end of the first resistor is connected with the base electrodes of the first triode and the second triode respectively, the collector electrode of the first triode is connected with the driving power supply, the emitter electrode of the first triode is connected with the emitter electrode of the second triode and the first end of the second resistor, the second end of the second resistor is connected with the first negative pressure driving circuit, and the collector electrode of the second triode is grounded.
Optionally, the first negative voltage driving circuit includes: a first voltage stabilizing tube and a first capacitor;
the cathode of the first voltage stabilizing tube is respectively connected with the second end of the second resistor and the first end of the first capacitor, and the anode of the first voltage stabilizing tube is respectively connected with the control end of the first power tube and the second end of the first capacitor.
Optionally, the second negative pressure driving circuit includes: the second voltage stabilizing tube, the second capacitor, the first diode and the third resistor; the step-down circuit includes: a fourth resistor and a third voltage regulator tube;
the cathode of the second voltage stabilizing tube is connected with the first end of the second capacitor, the cathode of the first diode, the second end of the fourth resistor and the cathode of the third voltage stabilizing tube, the anode of the second voltage stabilizing tube is connected with the first end of the third resistor and the second end of the second capacitor, the second end of the third resistor is connected with the control end of the second power tube, the anode of the first diode is connected with the output end of the second power tube, the first end of the fourth resistor is connected with the direct current bus, and the anode of the third voltage stabilizing tube is grounded.
Optionally, the power tube driving circuit further includes: fourth to fifth voltage stabilizing tubes, fifth to seventh resistors, and a second diode;
the cathode of the fourth voltage stabilizing tube is respectively connected with the second end of the third resistor, the cathode of the second diode, the first end of the fifth resistor and the control end of the second power tube, the anode of the fourth voltage stabilizing tube is respectively connected with the anode of the first diode, the anode of the second diode, the second end of the fifth resistor, the input end of the first power tube and the output end of the second power tube, the cathode of the fifth voltage stabilizing tube is respectively connected with the second end of the first capacitor, the anode of the first voltage stabilizing tube, the first end of the sixth resistor and the control end of the first power tube, the anode of the fifth voltage stabilizing tube is respectively connected with the second end of the sixth resistor, the first end of the seventh resistor and the output end of the first power tube, and the second end of the seventh resistor is grounded.
Optionally, the power tube driving circuit further includes: a third diode and an eighth resistor;
the cathode of the third diode is connected with the second end of the eighth resistor, the anode of the third diode is respectively connected with the first end of the first capacitor, the cathode of the first voltage stabilizing tube and the second end of the second resistor, and the first end of the eighth resistor is connected with the first end of the second resistor, the emitter of the first triode and the emitter of the second triode.
Optionally, the power tube driving circuit further includes: a third capacitor, a ninth resistor, and fourth to seventh diodes;
the first end of the third capacitor and the first end of the ninth resistor are connected with the direct current bus, the second end of the third capacitor is connected with the second end of the ninth resistor, the cathode of the fourth diode and the cathode of the sixth diode respectively, the anode of the fourth diode is connected with the cathode of the fifth diode, the anode of the sixth diode is connected with the cathode of the seventh diode, and the anode of the fifth diode is connected with the anode of the seventh diode and the input end of the second power tube respectively.
In order to achieve the above objective, the present invention further provides a power tube driving system, which includes the power tube driving circuit.
The invention provides a power tube driving circuit and a system, wherein the power tube driving circuit outputs a high-level signal and a low-level signal to a first negative voltage driving circuit through a push-pull circuit according to a received PWM driving signal; the first negative voltage driving circuit stores electric energy when receiving a high-level signal and outputs a positive voltage driving signal to the first power tube so as to conduct the first power tube; the first negative pressure driving circuit releases stored electric energy to generate a negative pressure driving signal when receiving the low level signal, and outputs the negative pressure driving signal to the first power tube so as to cut off the first power tube. The invention outputs positive-pressure driving signals to drive the first power tube to be conducted when outputting high-level signals, and stores electric energy; when a low-level signal is output, the stored electric energy is released, a negative pressure driving signal is formed to drive the first power tube to stop, and reliable driving of the power tube is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first embodiment of a power tube driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of a power tube driving circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a second embodiment of a power tube driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of a power tube driving circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a third embodiment of a power tube driving circuit according to an embodiment of the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Push-pull circuit | R1～R9 | First to ninth resistors |
| 20 | First negative voltage driving circuit | C1～C6 | First to sixth capacitances |
| 30 | Step-down circuit | D1～D9 | First to ninth diodes |
| 40 | Second negative pressure driving circuit | Q1～Q2 | First to second triodes |
| Z1～Z5 | First to fifth voltage stabilizing tubes | T1 | Flyback transformer |
| VCC | Driving power supply | GND | Grounded (earth) |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist and is not within the scope of protection claimed by the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a power tube driving circuit according to an embodiment of the present invention. Based on fig. 1, a first embodiment of the power tube driving circuit of the present invention is presented.
In this embodiment, the power tube driving circuit includes: a push-pull circuit 10 and a first negative-pressure driving circuit 20;
the first negative voltage driving circuit 20 is connected to the push-pull circuit 10 and the first power tube, respectively.
The push-pull circuit 10 may be configured to output a high level signal or a low level signal according to the PWM driving signal. The push-pull circuit 10 outputs a high level signal during an active duty cycle of a PWM drive signal and outputs a low level signal during an inactive duty cycle of the PWM drive signal. The first negative pressure driving circuit 20 is a circuit for driving the first power tube. When the first power tube needs to be conducted, the first negative voltage driving circuit 20 can output a positive voltage driving signal to conduct and drive the first power tube; when the first power tube needs to be turned off, the first negative voltage driving circuit 20 may output a negative voltage driving signal to turn off and drive the first power tube. The first power tube can be a triode, a MOS tube, an IGBT and other switching tubes. In this embodiment, the first power tube is a switching tube with a high-level conductive control end, and of course, a switching tube with a low-level conductive control end may also be used, and of course, a driving signal corresponding to the first power tube should be correspondingly adjusted.
In an implementation, the push-pull circuit 10 may output a high level signal and a low level signal to the first negative voltage driving circuit 20 according to a duty ratio of the received PWM driving signal; the first negative-pressure driving circuit 20 may output a positive-pressure driving signal to the first power tube when receiving the high-level signal, so as to conduct the first power tube, and may store the electric energy in the high-level signal through an internal energy storage component; when the first power tube is required to be cut off, that is, when a low-level signal is received, the energy storage component in the first negative-pressure driving circuit 20 releases stored electric energy to generate a negative-pressure driving signal at the control end of the first power tube, so that the first power tube is controlled to be cut off.
Wherein the PWM driving signal is a signal for controlling the voltage output from the push-pull circuit 10. The voltage output from the push-pull circuit 10 is not the same in the active duty time and the inactive duty time of the PWM driving signal. The positive and negative drive signals may be used for driving the power tube. In the driving process of the power tube, a voltage is applied to the control end, and when the applied voltage exceeds the conducting voltage of the power tube, the power tube is conducted; when the applied voltage is lower than the on voltage of the power tube, the power tube is turned off. When the driving power tube is cut off, a driving voltage lower than the conducting voltage is input to the control end of the air filter tube due to possible external interference, the power tube is not necessarily cut off, but the power tube can be driven to be cut off more accurately by inputting a negative pressure driving signal.
The embodiment provides a power tube driving circuit, which outputs a high-level signal and a low-level signal to a first negative-voltage driving circuit through a push-pull circuit according to a received PWM driving signal; the first negative voltage driving circuit stores electric energy when receiving a high-level signal and outputs a positive voltage driving signal to the first power tube so as to conduct the first power tube; the first negative pressure driving circuit releases stored electric energy to generate a negative pressure driving signal when receiving the low level signal, and outputs the negative pressure driving signal to the first power tube so as to cut off the first power tube. In the embodiment, when a high-level signal is output, a positive-voltage driving signal is output to drive the first power tube to be conducted, and electric energy is stored; when a low-level signal is output, the stored electric energy is released, a negative pressure driving signal is formed to drive the first power tube to stop, and reliable driving of the power tube is achieved.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of a power tube driving circuit according to an embodiment of the present invention. A second embodiment of the power tube driving circuit of the present invention is proposed based on the first embodiment of the power tube driving circuit described above.
In this embodiment, the power tube driving circuit further includes: a step-down circuit 30;
the step-down circuit 30 is connected to a dc bus and a second power tube, and the second power tube is connected to the dc bus and the first power tube.
It will be appreciated that in a double-tube series circuit, the conduction of one power tube can be controlled, typically by controlling the conduction of the other power tube. For example, in this embodiment, the on/off of the second power tube may be controlled by the on/off of the first power tube. Referring to fig. 3, the drain electrode of the first power tube is connected with the source electrode of the second power tube; when the first power tube is cut off, due to the clamping effect of the second diode D2, when the second diode D2 breaks down, the voltage difference between the grid electrode and the source electrode of the second power tube is small, and at the moment, the second power tube is cut off. When the first power tube is conducted, the source electrode of the second power tube is grounded through the first power tube, and the voltage difference between the grid electrode and the source electrode of the second power tube is large, so that the second power tube is conducted.
The step-down circuit 30 is used to convert the voltage of the dc bus into a voltage that can be directly input to the second power transistor. The voltage of the dc bus may be a voltage with a relatively high voltage value, and directly inputting the voltage of the dc bus to the second power tube may damage the second power tube directly, so that the voltage output by the dc bus needs to be input to the second power tube after being reduced.
In a specific implementation, the step-down circuit 30 may step down the bus voltage output by the dc bus when the first power tube is turned on, and input the stepped-down bus voltage to the second power tube through a loop formed by the dc bus, the second power tube, and the first power tube, so as to drive the second power tube to be turned on.
It can be understood that when the first power tube is turned off, the output voltage of the dc bus may form a high level signal at the control end, i.e., the gate, of the second power tube, but a complete loop cannot be formed, because a certain voltage difference cannot be formed between the output end, i.e., the source, of the second power tube and the gate of the second power tube due to the effect of the second diode D2, so as to control the second power tube to be turned off.
In this embodiment, the positive-pressure driving signal and the negative-pressure driving signal output by the first negative-pressure driving circuit are used for driving and controlling the first power tube, so that the double-tube serial connection of the first power tube and the second power tube can be effectively driven and controlled, and the accurate driving and controlling of the double-tube serial connection system can be realized under the condition of accurately controlling the first power tube.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a third embodiment of a power tube driving circuit according to an embodiment of the present invention. Based on the above second embodiment, a third embodiment of the power tube driving circuit of the present invention is proposed.
In this embodiment, the power tube driving circuit further includes: a second negative-pressure driving circuit 40;
the second negative-pressure driving circuit 40 is connected to the step-down circuit 30 and the second power tube, respectively.
The second negative-pressure driving circuit 40 is a circuit for driving the second power tube. The second negative pressure driving circuit 40 can also input a negative pressure driving signal at the control end of the second power tube when the second power tube needs to be cut off, so as to avoid the situation that the second power tube cannot be cut off normally due to interference.
It will be appreciated that in a drive circuit with dual tubes in series, the drive of one power tube can be precisely controlled by positive and negative drive signals, thereby controlling the reliable drive of the other power tube. Of course, the driving of the two power tubes can be directly controlled by positive-pressure driving signals and negative-pressure driving signals, so that the driving control of the two power tubes in the driving circuit with the double tubes connected in series can be more accurately performed.
In a specific implementation, the step-down circuit 30 may input the stepped-down bus voltage to the second negative-pressure driving circuit 40 when the first power tube is turned on; the second negative-pressure driving circuit 40 may store electric energy when receiving the reduced bus voltage, and output a positive-pressure driving signal to the second power tube, so as to conduct the second power tube; and releasing the stored electric energy when the first power tube is cut off, and forming a negative pressure driving signal at the control end of the second power tube so as to accurately cut off the second power tube.
In this embodiment, the push-pull circuit 10 includes: first to second resistors and first to second transistors;
the first end of the first resistor R1 is connected with the output end of the PWM driving signal, the second end of the first resistor R1 is connected with the bases of the first triode Q1 and the second triode Q2, the collector of the first triode Q1 is connected with the driving power VCC, the emitter of the first triode Q1 is connected with the emitter of the second triode Q2 and the first end of the second resistor R2, the second end of the second resistor R2 is connected with the first negative voltage driving circuit 20, and the collector of the second triode Q2 is grounded GND.
Referring to fig. 5, it should be noted that the first transistor Q1 is an NPN transistor, and the second transistor is a PNP transistor. The PWM driving signal is input to the bases of the first transistor Q1 and the second transistor Q2 in the push-pull circuit, so that the first transistor Q1 and the second transistor Q2 cannot be turned on simultaneously.
In a specific implementation, during the effective duty cycle time of the PWM driving signal, a high level signal is input to the base of the first transistor Q1 through the first resistor R1 to turn on the first transistor Q1, and at this time, the driving power VCC connected to the collector of the first transistor Q1 outputs the high level signal to the first negative voltage driving circuit 20 through the first transistor Q1 and the second resistor R2. In the time of the ineffective duty ratio of the PWM driving signal, the bases of the first transistor Q1 and the second transistor Q2 are low level signals, at this time, the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the first negative voltage driving circuit 20 is directly grounded to release the stored electric energy, so that a negative voltage driving signal is formed at the control end of the first power transistor.
In this embodiment, the first negative pressure driving circuit 20 includes: a first voltage stabilizing tube Z1 and a first capacitor C1;
the cathode of the first voltage stabilizing tube Z1 is connected to the second end of the second resistor R2 and the first end of the first capacitor C1, and the anode of the first voltage stabilizing tube Z1 is connected to the control end of the first power tube and the second end of the first capacitor C1.
The first capacitor C1 is an energy storage capacitor for storing and discharging electric energy. Referring to fig. 5, when the first triode Q1 is turned on, the voltage of the driving power VCC is output to the first voltage stabilizing tube Z1 through the second resistor R2, so that the first voltage stabilizing tube Z1 may be broken down, and the voltage across the first capacitor C1 is the same as the voltage across the first voltage stabilizing tube Z1 due to the constant voltage drop effect of the first voltage stabilizing tube Z1, so as to store electric energy. For example, the driving power supply VCC outputs a voltage of 15V at the cathode of the first voltage regulator Z1, and the constant voltage drop of the first voltage regulator Z1 is 3V, so that the anode of the first voltage regulator Z1 outputs a positive voltage driving signal of 12V to the first power tube to drive the first power tube, and a potential difference of 3V is formed across the first capacitor C1. When the second triode Q2 is conducted, the voltage difference between the two ends of the first capacitor C1 is directly released through the second triode Q2 in a short time, so that a negative pressure driving signal is formed at the control end of the first power tube.
It should be understood that, since the PWM driving signal is a driving signal with a high frequency, the positive voltage driving signal inputted at the control terminal of the first power tube is as high as the replacement frequency of the negative voltage driving signal. When the control end of the first power tube detects, a positive pressure driving signal and a negative pressure driving signal with rapid frequency change can be obtained. For example 12V and-3V alternating at a time.
In this embodiment, the second negative pressure driving circuit 40 includes: the second voltage stabilizing tube Z2, the second capacitor C2, the first diode D1 and the third resistor R3; the step-down circuit 30 includes: a fourth resistor R4 and a third voltage stabilizing tube Z3;
the cathode of the second voltage stabilizing tube Z2 is connected with the first end of the second capacitor C2, the cathode of the first diode D1, the second end of the fourth resistor R4 and the cathode of the third voltage stabilizing tube Z3, the anode of the second voltage stabilizing tube Z2 is connected with the first end of the third resistor R3 and the second end of the second capacitor C2, the second end of the third resistor R3 is connected with the control end of the second power tube, the anode of the first diode D1 is connected with the output end of the second power tube, the first end of the fourth resistor R4 is connected with the dc bus, and the anode of the third voltage stabilizing tube Z3 is grounded at GND.
Note that, the second capacitor C2 is the same as the first capacitor C1 and is an energy storage capacitor. Referring to fig. 5, the voltage output from the dc bus may be reduced by the fourth resistor R4 and the third regulator Z3, and then the reduced bus voltage may be input to the cathode of the second regulator Z2. The bus voltage after the step-down outputs a high voltage signal to the control end of the second power tube, namely the grid electrode, after the bus voltage is subjected to the step-down again through the second voltage stabilizing tube Z2 and the third resistor R3, and the voltage value of the high voltage signal is lower than the bus voltage after the step-down.
In a specific implementation, when the first power tube is conducted, the output end, namely the source electrode, of the second power tube is directly grounded through the first power tube, at the moment, the control end, namely the grid electrode, of the second power tube is in the high-voltage signal state, a higher potential difference exists between the grid electrode and the source electrode of the second power tube, and the second power tube is conducted. When the first power tube is cut off, due to the clamping effect of the first diode D1, the output end of the second power tube, namely the source electrode, is directly connected with the cathode of the second voltage stabilizing tube Z2, at the moment, the source electrode voltage of the second power tube is the bus voltage after voltage reduction, the grid electrode voltage of the second power tube is the voltage of the high-level signal after voltage reduction again, and the voltage value of the high-voltage signal is lower than the bus voltage after voltage reduction, so that a negative pressure driving signal is formed between the grid electrode and the source electrode of the second power tube, and the cut-off of the second power tube is controlled.
In this embodiment, the power tube driving circuit further includes: fourth to fifth voltage stabilizing tubes, fifth to seventh resistors, and a second diode D2;
the fourth to fifth voltage stabilizing tubes, the fifth to seventh resistors, and the second diode D2 constitute a protection circuit. The protection circuit is arranged between the grid electrode and the source electrode of the first power tube and the second power tube. Under the condition that the source electrode of the first power tube is directly grounded, the voltage of the driving power supply is directly input to the grid electrode of the first power tube through the constant voltage drop of the first voltage stabilizing tube Z1, and a protection circuit can be arranged between the grid electrode and the source electrode of the first power tube in order to avoid the damage of the first power tube caused by overlarge voltage difference between the grid electrode and the source electrode of the first power tube. Of course, in order to prevent the second power tube from being damaged due to the excessive voltage difference between the gate and the source of the second power tube, the same protection circuit may be arranged between the gate and the source of the second power tube. The protection circuit can prevent the power tube from being damaged due to overlarge voltage difference between the control ends of the first power tube, the second power tube and the output end.
The cathode of the fourth voltage stabilizing tube Z4 is respectively connected with the second end of the third resistor R3, the cathode of the second diode D2, the first end of the fifth resistor R5 and the control end of the second power tube, the anode of the fourth voltage stabilizing tube Z4 is respectively connected with the anode of the first diode D1, the anode of the second diode D2, the second end of the fifth resistor R5, the input end of the first power tube and the output end of the second power tube, the cathode of the fifth voltage stabilizing tube Z5 is respectively connected with the second end of the first capacitor C1, the anode of the first voltage stabilizing tube Z1, the first end of the sixth resistor R6 and the control end of the first power tube, the anode of the fifth voltage stabilizing tube Z5 is respectively connected with the second end of the sixth resistor R6, the first end of the seventh resistor R7 and the output end of the first power tube, and the second resistor R7 is connected with the ground.
In a specific implementation, under the condition that the first power tube is turned on, through the voltage reduction effect of the fifth voltage stabilizing tube Z5, the sixth resistor R6 and the seventh resistor R7, the voltage of the gate voltage of the first power tube after being reduced can be connected to the source electrode of the first power tube, so that the voltage difference between the gate electrode and the source electrode of the first power tube is reduced, and the voltage difference between the gate electrode and the source electrode of the first power tube is kept to be larger than the conduction voltage difference for controlling the first power tube, namely, the influence on the conduction state of the first power tube in the protection process is avoided. In this embodiment, the fourth voltage regulator Z4 and the fifth resistor R5 connected between the gate and the source of the second power tube can regulate the voltage difference between the gate and the source of the second power tube, so as to protect the second power tube.
In this embodiment, the power tube driving circuit further includes: a third diode D3 and an eighth resistor R8;
it should be noted that the third diode and the eighth resistor may constitute an energy release circuit. The energy release circuit is arranged between the first end of the first capacitor C1 and the emitter of the second triode Q2. When the push-pull circuit outputs a low-level signal, the electric energy stored in the first capacitor C1 can be rapidly released through the energy release circuit formed by the third diode D3 and the eighth resistor R8, so that the grid voltage of the first power tube can be rapidly pulled down to negative pressure in the first capacitor C1.
The cathode of the third diode D3 is connected to the second end of the eighth resistor R8, and the anode of the third diode D3 is connected to the first end of the first capacitor C1, the cathode of the first regulator Z1, and the second end of the second resistor R2, and the first end of the eighth resistor R8 is connected to the first end of the second resistor R2, the emitter of the first triode Q1, and the emitter of the second triode Q2.
It should be understood that the anode of the third triode D3 is connected to the first end of the first electric heater C1, and the cathode is connected to the driving power VCC through the eighth resistor R8 and the first triode Q1, so that the driving voltage in the driving power VCC can be effectively prevented from being input to the first capacitor C1 through the eighth resistor R8 and the third diode D3, and the electric energy stored in the first capacitor C1 can be quickly released.
In a specific implementation, when the push-pull circuit 10 outputs a low-level signal, the electric energy stored in the first capacitor C1 can be directly released through a loop formed by the eighth resistor R8, the third diode D3 and the second triode Q2, so as to quickly pull down the voltages at two ends of the first capacitor C1, and form a negative pressure on the gate of the first power tube.
In this embodiment, the power tube driving circuit further includes: a third capacitor C3, a ninth resistor R9, and fourth to seventh diodes;
when the second power tube is turned off, the dc bus may form a peak voltage at the drain of the second power tube, and the second power tube is turned off and cannot release the peak voltage. In the present embodiment, the third capacitor C3, the ninth resistor R9, and the fourth to seventh diodes form a peak voltage bleeder circuit.
The first end of the third capacitor C3 and the first end of the ninth resistor R9 are connected to the dc bus, the second end of the third capacitor C3 is connected to the second end of the ninth resistor R9, the cathode of the fourth diode D4 and the cathode of the sixth diode D6, the anode of the fourth diode D4 is connected to the cathode of the fifth diode D5, the anode of the sixth diode D6 is connected to the cathode of the seventh diode D7, and the anode of the fifth diode D5 is connected to the anode of the seventh diode D7 and the input end of the second power tube.
It will be appreciated that the regulation of the bleed voltage and current can be effectively increased by the management of the series-parallel connection between the fourth to seventh diodes. The peak voltage can be divided by the series connection of the fourth diode D4 and the fifth diode D5 or the sixth diode D6 and the seventh diode D7, and the current corresponding to the peak voltage can be divided by the parallel connection of the branch composed of the fourth diode D4 and the fifth diode D5 and the branch composed of the sixth diode D6 and the seventh diode D7. Of course, in this embodiment, a diode with a larger withstand voltage and current value may be selected to replace the fourth to seventh diodes, where the cost problem in the specific use process is considered, and the common diodes of the fourth to seventh diodes may be selected to realize the method.
In a specific implementation, at the moment when the second power tube is cut off, the peak voltage formed at the drain electrode of the second power tube by the direct current bus can be transmitted to the ninth resistor R9 through the fourth diode to the seventh diode, and then the ninth resistor R9 gradually discharges the peak voltage in the form of heat energy, so that damage to other components in the circuit caused by the peak voltage is avoided.
Referring to fig. 5, the power tube driving circuit in the present embodiment is explained with a circuit of a flyback transformer T1 in fig. 5. In fig. 5, the fourth capacitor C4 connected to the dc bus may filter the voltage of the dc bus. The eighth diode D8 and the ninth diode D9 can half-wave rectify the voltage output by the flyback transformer T1, and the fifth capacitor C5 and the sixth capacitor C6 can filter the half-wave rectified voltage to obtain a smooth standard voltage.
In this embodiment, the negative pressure driving circuits are provided on the gates of the first power tube and the second power tube, so that the positive pressure driving signals need to be input to the gates of the first power tube and the second power tube when the first power tube and the second power tube need to be turned off, and the negative pressure driving signals are formed between the gates and the sources of the first power tube and the second power tube, so that the driving control of the first power tube and the second power tube can be performed more accurately.
In order to achieve the above objective, the present invention further provides a power tube driving system, which includes the power tube driving circuit described above. The specific structure of the power tube driving circuit refers to the above embodiments, and since the power tube driving system adopts all the technical solutions of all the embodiments, the power tube driving circuit at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (9)
1. A power tube driving circuit, characterized in that the power tube driving circuit comprises: a push-pull circuit and a first negative voltage driving circuit;
the first negative pressure driving circuit is connected with the push-pull circuit and the first power tube respectively;
the push-pull circuit is used for outputting a high-level signal and a low-level signal to the first negative-voltage driving circuit according to the received PWM driving signal;
the first negative voltage driving circuit is used for storing electric energy when receiving the high-level signal and outputting a positive voltage driving signal to the first power tube so as to conduct the first power tube;
the first negative pressure driving circuit is further used for releasing stored electric energy to generate a negative pressure driving signal when receiving the low-level signal, and outputting the negative pressure driving signal to the first power tube so as to cut off the first power tube;
the power tube driving circuit further includes: a step-down circuit;
the step-down circuit is connected with a direct current bus and a second power tube, and the second power tube is connected with the direct current bus and the first power tube;
and the voltage reducing circuit is used for reducing the bus voltage output by the direct current bus when the first power tube is conducted, and inputting the reduced bus voltage to the second power tube so as to conduct the second power tube.
2. The power tube driving circuit as claimed in claim 1, wherein the power tube driving circuit further comprises: a second negative pressure driving circuit;
the second negative pressure driving circuit is connected with the voltage reducing circuit and the second power tube respectively;
the step-down circuit is used for inputting the bus voltage after step-down to the second negative-pressure driving circuit when the first power tube is conducted;
the second negative-pressure driving circuit is used for storing electric energy when receiving the reduced bus voltage and outputting a positive-pressure driving signal to the second power tube so as to conduct the second power tube;
the second negative pressure driving circuit is further used for releasing stored electric energy when the first power tube is cut off so as to generate a negative pressure driving signal, and outputting the negative pressure driving signal to the second power tube so as to cut off the second power tube.
3. The power tube driving circuit as claimed in claim 2, wherein the push-pull circuit comprises: first to second resistors and first to second transistors;
the first end of the first resistor is connected with the output end of the PWM driving signal, the second end of the first resistor is connected with the base electrodes of the first triode and the second triode respectively, the collector electrode of the first triode is connected with the driving power supply, the emitter electrode of the first triode is connected with the emitter electrode of the second triode and the first end of the second resistor, the second end of the second resistor is connected with the first negative pressure driving circuit, and the collector electrode of the second triode is grounded.
4. The power tube driving circuit as claimed in claim 3, wherein the first negative voltage driving circuit comprises: a first voltage stabilizing tube and a first capacitor;
the cathode of the first voltage stabilizing tube is respectively connected with the second end of the second resistor and the first end of the first capacitor, and the anode of the first voltage stabilizing tube is respectively connected with the control end of the first power tube and the second end of the first capacitor.
5. The power tube driving circuit as claimed in claim 4, wherein the second negative voltage driving circuit comprises: the second voltage stabilizing tube, the second capacitor, the first diode and the third resistor; the step-down circuit includes: a fourth resistor and a third voltage regulator tube;
the cathode of the second voltage stabilizing tube is connected with the first end of the second capacitor, the cathode of the first diode, the second end of the fourth resistor and the cathode of the third voltage stabilizing tube, the anode of the second voltage stabilizing tube is connected with the first end of the third resistor and the second end of the second capacitor, the second end of the third resistor is connected with the control end of the second power tube, the anode of the first diode is connected with the output end of the second power tube, the first end of the fourth resistor is connected with the direct current bus, and the anode of the third voltage stabilizing tube is grounded.
6. The power tube driving circuit as claimed in claim 5, wherein the power tube driving circuit further comprises: fourth to fifth voltage stabilizing tubes, fifth to seventh resistors, and a second diode;
the cathode of the fourth voltage stabilizing tube is respectively connected with the second end of the third resistor, the cathode of the second diode, the first end of the fifth resistor and the control end of the second power tube, the anode of the fourth voltage stabilizing tube is respectively connected with the anode of the first diode, the anode of the second diode, the second end of the fifth resistor, the input end of the first power tube and the output end of the second power tube, the cathode of the fifth voltage stabilizing tube is respectively connected with the second end of the first capacitor, the anode of the first voltage stabilizing tube, the first end of the sixth resistor and the control end of the first power tube, the anode of the fifth voltage stabilizing tube is respectively connected with the second end of the sixth resistor, the first end of the seventh resistor and the output end of the first power tube, and the second end of the seventh resistor is grounded.
7. The power tube driving circuit as claimed in claim 6, wherein the power tube driving circuit further comprises: a third diode and an eighth resistor;
the cathode of the third diode is connected with the second end of the eighth resistor, the anode of the third diode is respectively connected with the first end of the first capacitor, the cathode of the first voltage stabilizing tube and the second end of the second resistor, and the first end of the eighth resistor is connected with the first end of the second resistor, the emitter of the first triode and the emitter of the second triode.
8. The power tube driving circuit as claimed in claim 5, wherein the power tube driving circuit further comprises: a third capacitor, a ninth resistor, and fourth to seventh diodes;
the first end of the third capacitor and the first end of the ninth resistor are connected with the direct current bus, the second end of the third capacitor is connected with the second end of the ninth resistor, the cathode of the fourth diode and the cathode of the sixth diode respectively, the anode of the fourth diode is connected with the cathode of the fifth diode, the anode of the sixth diode is connected with the cathode of the seventh diode, and the anode of the fifth diode is connected with the anode of the seventh diode and the input end of the second power tube respectively.
9. A power tube driving system, characterized in that the power tube driving system comprises the power tube driving circuit as claimed in any one of claims 1-8.
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