CN115800971A - Switch tube switch drive circuit and electric vehicle charging pile - Google Patents

Switch tube switch drive circuit and electric vehicle charging pile Download PDF

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Publication number
CN115800971A
CN115800971A CN202211396807.2A CN202211396807A CN115800971A CN 115800971 A CN115800971 A CN 115800971A CN 202211396807 A CN202211396807 A CN 202211396807A CN 115800971 A CN115800971 A CN 115800971A
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China
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circuit
switch
driving circuit
electrically connected
switching
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CN202211396807.2A
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Chinese (zh)
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茹永刚
张宸
张军涛
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Xi'an Xingyuan Borui New Energy Technology Co ltd
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Xi'an Xingyuan Borui New Energy Technology Co ltd
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Priority to CN202211396807.2A priority Critical patent/CN115800971A/en
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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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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Abstract

The application provides a switching tube switch driving circuit and an electric vehicle charging pile, wherein the switching tube switch driving circuit comprises a switching-on driving circuit and a negative voltage switching-off circuit; the positive end of the switching-on driving circuit is electrically connected with the positive end of the driving signal end of the controlled switching tube through a first lead; the negative end of the switching-on driving circuit is electrically connected with the negative end of the driving signal of the controlled switching tube through a second lead; a first diode and a resistor are electrically connected between the first lead and the second lead, the positive end of the first diode is electrically connected with the first lead, the negative end of the diode is electrically connected with one end of the resistor, and the other end of the resistor is electrically connected with the second lead; a circuit node is formed at the electric connection position of the other end of the resistor and the second lead, and a capacitor is electrically connected between the circuit node and the negative electrode end of the on driving circuit. The switching tube switch driving circuit provided by the embodiment of the application not only can enable the controlled switching tube to be reliably switched off, but also can accelerate the switching-off speed of the controlled switching tube.

Description

Switch tube switch driving circuit and electric vehicle charging pile
Technical Field
The application relates to the technical field of power electronics, in particular to a switch tube switch driving circuit.
Background
The switch tube is widely applied in the technical field of power electronics, for example, in the design process of the electric vehicle charging pile, the switch tube can be used for controlling the connection relation between the charging module and the output end of the charging pile.
Referring to fig. 7, a reference document "cn201520128570.9llc drive circuit and switching power supply" proposes a turn-off reverse pumping circuit, when a controlled switching tube is turned off, voltage discharge between driving ports AB is accelerated by turning on Q1, so as to achieve rapid turn-off.
Although the document provides a turn-off and back-pumping circuit, when the Q1 is actually turned on, there is still a forward conduction voltage drop, that is, the controlled switching tube is actually in a positive voltage turn-off state, but the positive voltage is smaller than the turn-on threshold voltage of the controlled switching tube, and a low-impedance path is provided to back-pump the driving current, so that the purpose of turning off the controlled switching tube can be achieved.
However, due to the positive voltage turn-off, when the driving signal port of the controlled switching tube is interfered, the voltage of the driving signal port is easily raised and exceeds the turn-on threshold voltage, so that the turn-off of the controlled switching tube is unreliable.
Disclosure of Invention
The application provides a switch tube switch drive circuit and electric vehicle fill electric pile for solve the problem that exists among the prior art.
In a first aspect, the application provides a switching tube switch driving circuit, which includes a switching-on driving circuit and a negative voltage switching-off circuit, wherein the negative voltage switching-off circuit includes a first diode, a resistor and a capacitor, and the switching tube is of a forward driving type and can bear reverse voltage of a preset magnitude;
the positive end of the switching-on driving circuit is electrically connected with the positive end of the driving signal end of the controlled switching tube through a first lead;
the negative end of the switching-on drive circuit is electrically connected with the negative end of the drive signal of the controlled switching tube through a second lead;
a first diode and a resistor are electrically connected between the first lead and the second lead, the positive end of the first diode is electrically connected with the first lead, the negative end of the diode is electrically connected with one end of the resistor, and the other end of the resistor is electrically connected with the second lead;
a circuit node is formed at the electric connection position of the other end of the resistor and the second lead, and a capacitor is electrically connected between the circuit node and the negative electrode end of the turn-on driving circuit.
Optionally, the negative voltage turn-off circuit further comprises a zener diode connected in parallel across the capacitor.
Optionally, the plurality of zener diodes are connected in series; a plurality of zener diodes connected in series with each other are connected in parallel across the capacitor.
Optionally, the negative voltage turn-off circuit further includes a second diode connected in parallel across the capacitor.
Optionally, the second diodes are connected in series, and the plurality of second diodes connected in series are connected in parallel at two ends of the capacitor.
Optionally, the controlled switching tube is a controllable transistor or a controllable switch.
Optionally, the controllable transistor is any one of a triode, a thyristor, a field effect transistor and an IGBT; the controllable switch is any one of a relay and an optical coupler.
In a second aspect, the present application provides an electric vehicle charging pile, including a charging module and any one of the switching tube switch driving circuits described in the above first aspect; the switch tube switch driving circuit comprises a negative pressure turn-off circuit and a turn-on driving circuit, the negative pressure turn-off circuit and the turn-on driving circuit are used for controlling the controlled switch tube to be turned on or off, the charging module is electrically connected with the input end of the controlled switch tube, and the output end of the controlled switch tube is electrically connected with the output end of the charging pile.
As can be seen from the above, the switching tube switch driving circuit provided in the embodiment of the present application is additionally provided with a negative voltage turn-off circuit, where the negative voltage turn-off circuit includes a first diode, a resistor and a capacitor, and discharges the current at the driving signal port of the controlled switching tube through the unidirectional conduction circuit of the first diode and the resistor, so as to accelerate the discharging speed of the controlled switching tube; the negative voltage source at the driving signal port of the controlled switching tube is improved through the capacitor, and the switching-off reliability of the controlled switching tube is improved; compared with a circuit which is turned off by positive voltage or zero voltage in the prior art, the switching tube switch driving circuit not only can turn off the controlled switching tube reliably, but also can increase the turn-off speed of the controlled switching tube.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a switching tube switch driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a switching tube switch driving circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic diagram of a switching tube switch driving circuit according to another embodiment of the present application;
fig. 4 is a schematic diagram of a switching tube switch driving circuit according to another embodiment of the present application;
fig. 5 is a schematic diagram of a switching tube switch driving circuit according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of an electric vehicle charging pile according to another embodiment of the present application;
fig. 7 is a schematic diagram of a switching tube switch driving circuit provided in the prior art.
In the figure:
a first conductive line 11; a second conductive line 12;
turning on a positive electrode end M of a driving circuit; turning on a negative electrode end D of the driving circuit;
a first diode D1; a second diode D2; a first voltage-stabilizing diode VD1;
a resistance R; a capacitor C;
a drive signal positive terminal A; the negative end B of the driving signal.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application. In addition, it should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a switching tube switch driving circuit according to an embodiment of the present application. As shown in fig. 1, the switching tube switch driving circuit includes a turn-on driving circuit and a negative voltage turn-off circuit, wherein the negative voltage turn-off circuit includes a first diode D1, a resistor R and a capacitor C.
And the positive end of the switching-on driving circuit is electrically connected with the positive end of the driving signal port of the controlled switch tube through a first lead 11.
And the negative end of the switching-on drive circuit is electrically connected with the negative end of the drive signal of the controlled switching tube through a second lead 12.
A first diode D1 and a resistor R are electrically connected between the first lead 11 and the second lead 12, the positive end of the first diode D1 is electrically connected with the first lead 11, the negative end of the diode is electrically connected with one end of the resistor R, and the other end of the resistor R is electrically connected with the second lead 12.
A circuit node is formed at the electric connection position of the other end of the resistor R and the second lead 12, and a capacitor C is electrically connected between the circuit node and the negative electrode end of the turn-on driving circuit.
The controlled switch tube is of a forward driving type and can bear reverse voltage of a preset size.
For example, in the case that the controlled switch is an NPN transistor, the power source is applied to the emitter junction, so that the emitter junction is forward biased, that is, when the voltage of the base of the transistor is higher than the voltage of the emitter, the emitter junction is forward biased, and at this time, the collector and the emitter are conducted, and a current flows through the emitter junction. In addition, the NPN type triode can bear smaller reverse current between the emitter and the base, and between the emitter and the collector.
When the switching-on driving circuit provides voltage for the controlled switch tube, the voltage at two ends of the controlled switch tube is larger than the switching-on threshold voltage of the controlled switch tube to be switched on.
The turn-on driving circuit is generally connected to a Digital Signal Processing chip (DSP), so that the operating state of the turn-on driving circuit is determined by an electrical Signal sent by the DSP chip. For example, when the DSP chip sends a high voltage, the turn-on driving circuit is in a working state and outputs a current, and when the DSP chip sends a low voltage, the turn-on driving circuit is in a non-working state and does not output a current.
Further, after the controlled switch tube is turned on, the turn-on driving circuit is also used for maintaining the controlled switch tube to be kept at the voltage required by turn-on.
The negative pressure turn-off circuit is used for generating negative pressure beneficial to turn-off of the controlled switch tube when the switch tube is turned off, and reliable turn-off of the controlled switch tube is guaranteed.
Further, when the controlled switching tube is selected, the selection is performed according to the forward driving voltage that the controlled switching tube can bear and the driving circuit where the controlled switching tube is located. When the driving voltage in the circuit where the controlled switching tube is located is large, the controlled switching tube with large forward driving voltage can be selected under the condition that the controlled switching tube can be normally switched on, so that the problem that the controlled switching tube is damaged due to the fact that the controlled switching tube with small forward switching voltage is selected and the driving voltage in the circuit is large is solved.
The controlled switch tube can bear reverse voltage with preset magnitude which is larger than the reverse voltage generated when the controlled switch tube is turned off so as to ensure that the controlled switch tube is not damaged when the controlled switch tube is turned off.
In addition, the switching-on driving circuit can be selected according to the performance of the selected controlled switching tube. For example, if the turn-on voltage of the controlled switching tube is 20V, the output voltage of the turn-on driving circuit needs to be greater than 20V, for example, the output voltage of the turn-on driving circuit needs to be 25V.
In addition, the first diode D1 in the negative voltage turn-off circuit can be selected according to the magnitude of the current in the circuit where the first diode D1 is located, and the rated current of the selected first diode D1 is larger than the current in the circuit where the first diode D1 is located, so that the situation that the first diode D1 is burnt out is reduced.
In addition, the current for the circuit in which the first diode D1 is located can be determined by means of a plurality of measurements.
The capacitor C may be selected according to the actual condition of the circuit in which the capacitor C is located, and the rated voltage of the selected capacitor C needs to be greater than the peak voltage of the actual divided voltage at the two ends of the capacitor C, for example, if the peak voltage of the divided voltage at the two ends of the capacitor C is 28V, the capacitor with the rated voltage of 50V is selected, so as to ensure the safety of the use of the capacitor C. In addition, the peak voltage across the capacitor C can be obtained by actual measurement.
Further, for the selection of the capacitor C, the switching frequency for turning on the driving circuit may be referred to, and when the switching frequency for turning on the driving circuit is large, the charging and discharging time is also short, and the electric quantity is small during each charging, so that the capacitor C with a small capacity may be selected; when the switching frequency for turning on the drive circuit is low, the charge/discharge time is long, and the amount of electricity per charge is large, so that the capacitor C having a large capacity can be selected.
Of course, when the capacitor is selected, other parameters may be used for determination, which is not described herein.
Wherein, resistance R can select according to condenser C's capacity, and when condenser C's capacity is great, can select the less resistance R of resistance to when making electric current pass through resistance R, voltage drop is slow, and the electric current in the circuit is great, thereby guarantees faster charge speed. When the capacity of the capacitor C is small, the resistor R with a large resistance value can be selected, so that when current passes through the resistor R, voltage drop is obvious, the current of the circuit is small, and the capacitor C is not damaged when the capacitor C is charged.
Other electronic devices related to the embodiments of the present application are all selected according to actual situations, and the present application is not limited to this.
The working principle of the switching tube switch driving circuit is as follows:
when the controlled switch tube needs to be switched on, the switching-on driving circuit is controlled to work, the switching-on driving circuit outputs positive voltage when working, at the moment, the end M is plus, the end D is minus, current is output from the positive end of the controlled switch tube, the current reaches the input end of the driving signal end of the switch tube after passing through the first lead 11, namely the positive end of the driving signal, and flows out through the output end of the driving signal end, namely the negative end of the driving signal, at the moment, the positive end and the negative end of the controlled switch tube have positive voltage, the end A is plus, the end B is minus, and because the output voltage when the switching-on driving circuit works is greater than the switching-on threshold voltage of the switch tube, the controlled switch tube executes switching-on action and is switched on.
Meanwhile, the first diode D1 is turned on in the forward direction to form a charging loop of the capacitor C with the resistor R, so that the capacitor C is rapidly charged, the voltage across the capacitor C rapidly rises, and the terminal E is + and the terminal F is-.
In addition, it should be noted that when the resistor R is disposed in the circuit, the total current in the circuit is increased, that is, the charging current for charging the capacitor C is increased, so as to accelerate the charging speed for the capacitor C.
When the controlled switch tube needs to be turned off, the control turn-on driving circuit does not work, the turn-on driving circuit does not maintain current output any more, the voltage at the two ends of the controlled switch tube is smaller than the turn-on threshold voltage of the controlled switch tube, and the controlled switch tube is turned off.
It should be noted that, when the controlled switching tube is turned off, the positive end of the driving signal of the controlled switching tube needs to discharge, and after the discharge is finished, the controlled switching tube is completely turned off.
When the on-state drive circuit does not maintain current output any more, the capacitor C is also discharged, the capacitor C can provide a negative voltage source at the drive signal port of the controlled switch tube, the end E is plus, the end F is minus, and the voltage at the two ends of the capacitor C is U EF Since the E terminal and the B terminal are directly connected and no voltage is output between the MD terminals, the voltage U between the ports of the driving circuit is turned on MD Has a voltage of U AB +U EF . Therefore, the voltage difference between the two ends of the on-state driving circuit not only includes U AB The voltage difference between the two ends of the capacitor C is also included, so that basically the original drive off current can generate larger drive off current, and the direction of the off current flows out from the A end and flows in from the M end.
In addition, the analysis is carried out from the aspect that the controlled switch tube is conducted, because the capacitor C provides a negative voltage source at the driving signal port of the controlled switch tube when the controlled switch tube is turned off, even if the controlled switch tube is interfered by voltage oscillation in the process of executing the turn-off action, the port voltage U of the driving signal of the controlled switch tube is not easy to be caused under the action of the negative voltage source by the voltage at the driving signal port of the controlled switch tube AB The threshold voltage is switched on when the controlled switch tube is driven, so that the controlled switch tube can be reliably switched off, and the problem that the controlled switch tube is interfered and switched on by mistake when being driven is solved.
Furthermore, because the positive voltage is applied between the driving signal ports AB of the controlled switching tube, the unidirectional turn-on circuit composed of the first diode D1 and the resistor R can also play a discharging role, and the current is output from the a end to reach the first diode D1 and consumed by the resistor R, so that the speed of turning off the controlled switching tube is accelerated under the action of the unidirectional turn-on circuit.
In addition, the negative electrode end of the first diode D1 in the circuit is connected with the resistor R, so that the capacitor C can be prevented from discharging through the resistor R, the existence of a negative voltage source in the circuit can be maintained, and the turn-off reliability of the controlled switching tube is further improved.
As can be seen from the above, the switching tube switch driving circuit provided in the embodiment of the present application is additionally provided with a negative voltage turn-off circuit, where the negative voltage turn-off circuit includes the first diode D1, the resistor R and the capacitor C, and discharges the current at the controlled switching tube driving signal port through the unidirectional conduction circuit of the first diode D1 and the resistor R, so as to accelerate the discharging speed of the controlled switching tube; the negative voltage source at the driving signal port of the controlled switching tube is improved through the capacitor C, and the switching-off reliability of the controlled switching tube is improved; compared with a circuit which is turned off by positive voltage or zero voltage in the prior art, the switching tube switch driving circuit not only can turn off the controlled switching tube reliably, but also can increase the turn-off speed of the controlled switching tube.
Optionally, the controlled switching tube is a controllable transistor or a controllable switch.
Further, when the controlled switch tube is a controllable transistor, the controlled switch tube may be any one of a triode, a thyristor, a field effect transistor, and an IGBT.
Further, when the controlled switch tube is a controllable switch, the controllable switch is any one of a relay and an optocoupler.
In addition, although the triode, the thyristor, the field effect transistor, the IGBT, the relay, and the optocoupler are of a forward driving type and can bear a reverse voltage of a predetermined magnitude, the functions are different, for example, the triode has a function of amplifying a current, and the relay is mainly used as an automatic switch, and therefore, when the switch is used, the selection is performed according to a function actually required.
Optionally, referring to fig. 2, the negative voltage turn-off circuit further includes a first voltage regulator diode VD1, and the first voltage regulator diode VD1 is connected in parallel across the capacitor C.
When the two ends of the capacitor C are connected with the first voltage stabilizing diode VD1 in parallel, the voltage increased by the two ends of the capacitor C is determined by the stable voltage of the first voltage stabilizing diode VD1 connected in parallel, when the voltage at the two ends of the first voltage stabilizing diode VD1 reaches the stable voltage, the circuit does not charge the capacitor C, and the voltage at the two ends of the capacitor C does not reach the stable voltageRe-variation, i.e. switching negative voltage value U on and off at controlled switching tube EF The stable voltage through first zener diode VD1 decides, therefore first zener diode VD1 plays the effect of setting for negative voltage source value, and when the voltage at first zener diode VD1 both ends reached stable voltage, the circuit can prevent that condenser C from being infinitely charged and damaging after no longer charging condenser C, consequently still plays the effect of protection condenser C.
Further, when the regulated voltage of one zener diode is too small, a plurality of zener diodes may be connected in series, and the plurality of zener diodes may be connected in series and then connected in parallel to both ends of the capacitor C.
Referring to fig. 3, the N zener diodes connected in series are the first zener diode VD1 to the nth zener diode VDN, respectively.
The voltage at two ends of the capacitor C can be improved through the plurality of voltage stabilizing diodes connected in series, so that the value of the negative voltage source can be improved, the anti-interference capability of the controlled switch tube when the controlled switch tube is turned off is improved, and the turn-off reliability of the controlled switch tube is improved.
Optionally, referring to fig. 4, the negative voltage turn-off circuit further includes a second diode D2, and the second diode D2 is connected in parallel across the capacitor C.
When the two ends of the capacitor C are connected with the second diode D2 in parallel, the voltage increased by the two ends of the capacitor C is determined by the conducting voltage of the second diode D2 connected in parallel, when the voltage at the two ends of the second diode D2 reaches the conducting voltage, the circuit does not charge the capacitor C any more, the voltage at the two ends of the capacitor C does not change any more, namely, when the controlled switch tube is turned off, the negative voltage value U is EF The on-state voltage of the second diode D2 is determined, so the second diode D2 plays a role of setting a negative voltage value, and when the voltage at the two ends of the second diode D2 reaches a stable voltage, the circuit can prevent the capacitor C from being damaged due to infinite charging after the capacitor C is no longer charged, thereby also playing a role of protecting the capacitor C.
Alternatively, referring to fig. 5, when the voltage after one second diode D2 is turned on is relatively small, a plurality of second diodes D2 may be connected in parallel at both ends of the capacitor C, and the plurality of second diodes D2 may be connected in series. Referring to fig. 5, the plurality of second diodes D2 connected in series are numbered D2 to DN, respectively.
The voltage at two ends of the capacitor C can be increased through the second diodes D2 connected in series, so that the value of a negative voltage source can be increased, the anti-interference capability of the controlled switch tube when the controlled switch tube is turned off is improved, and the turn-off reliability of the controlled switch tube is improved.
Referring to fig. 6, an embodiment of the present application further provides an electric vehicle charging pile, including a charging module and a switching tube switch driving circuit according to any one of the above embodiments; the switch tube switch driving circuit comprises a negative pressure turn-off circuit and a turn-on driving circuit, the negative pressure turn-off circuit and the turn-on driving circuit are used for controlling the turn-on and the turn-off of the switch tube, the charging module is electrically connected with the input end of the controlled switch tube, and the output end of the controlled switch tube is electrically connected with the output end of the charging pile.
When the electric vehicle charging pile is used for charging, firstly, the electric vehicle to be charged is electrically connected with the output end of the charging pile, and then the on-off of the controlled switch tube is controlled by controlling the on-off of the driving circuit. When the drive circuit is switched on to output forward current, the controlled switch tube is switched on, and at the moment, the charging module is electrically connected with the vehicle to be charged, so that the vehicle to be charged is charged. When the vehicle to be charged finishes charging, the controlled switch tube is turned off when the control switch-on driving circuit does not output forward current any more, and at the moment, the charging module is disconnected with the vehicle to be charged, so that the charging of the vehicle to be charged is stopped.
Further, in the embodiment shown in fig. 6, the controlled switch tube is generally an IGBT or a high voltage dc contactor.
The electric vehicle charging pile is electrically connected with a vehicle to be charged through a controlled switch tube switching on and off charging module, wherein the controlled switch tube is controlled through a switch tube switch driving circuit, further, the switch tube switch driving circuit comprises a negative voltage switching-off circuit, the negative voltage switching-off circuit comprises a first diode D1, a resistor R and a capacitor C, and current of a switch tube driving signal port is discharged through the first diode D1 and the resistor R, so that the discharging speed of the controlled switch tube is accelerated; the negative voltage source at the driving port of the controlled switching tube is improved through the capacitor C, and the switching-off reliability of the controlled switching tube is improved; therefore, the electric vehicle fills electric pile that this application embodiment provided can guarantee to wait to charge the vehicle and fill the reliable disconnection of electric pile output port, can improve the vehicle of waiting to charge and fill the disconnection speed of electric pile moreover, reduces the power consumption.
Finally, it should be noted that the contents not described in the technical solutions of the present application can all be implemented by using the prior art. In addition, the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (8)

1. A switch tube switch driving circuit is characterized by comprising a switching-on driving circuit and a negative voltage switching-off circuit, wherein the negative voltage switching-off circuit comprises a first diode, a resistor and a capacitor, and the switch tube is of a forward driving type and can bear reverse voltage with a preset magnitude;
the positive end of the switching-on driving circuit is electrically connected with the positive end of the driving signal end of the controlled switch tube through a first lead;
the negative end of the switching-on driving circuit is electrically connected with the negative end of the driving signal of the controlled switching tube through a second lead;
a first diode and a resistor are electrically connected between the first lead and the second lead, the positive end of the first diode is electrically connected with the first lead, the negative end of the diode is electrically connected with one end of the resistor, and the other end of the resistor is electrically connected with the second lead;
a circuit node is formed at the electric connection position of the other end of the resistor and the second lead, and a capacitor is electrically connected between the circuit node and the negative electrode end of the turn-on driving circuit.
2. The switching tube switch driver circuit of claim 1, wherein the negative turn-off circuit further comprises a zener diode connected in parallel across the capacitor.
3. The switch driver circuit of claim 2, wherein the Zener diodes are connected in series; a plurality of zener diodes connected in series with each other are connected in parallel across the capacitor.
4. The switch-transistor switch driver circuit of claim 1, wherein the negative turn-off circuit further comprises a second diode connected in parallel across the capacitor.
5. The switch driver circuit of claim 4, wherein the second diodes are connected in series, and the second diodes connected in series are connected in parallel to both ends of the capacitor.
6. The switching tube switch driving circuit according to any one of claims 1-5, wherein the controlled switching tube is a controllable transistor or a controllable switch.
7. The switch-transistor switch driving circuit according to claim 6, wherein the controllable transistor is any one of a triode, a thyristor, a field effect transistor, and an IGBT; the controllable switch is any one of a relay and an optical coupler.
8. An electric vehicle charging pile, characterized by comprising a charging module and a switching tube switch driving circuit according to any one of claims 1 to 7; the switch tube switch driving circuit comprises a negative pressure turn-off circuit and a turn-on driving circuit, the negative pressure turn-off circuit and the turn-on driving circuit are used for controlling the controlled switch tube to be turned on or off, the charging module is electrically connected with the input end of the controlled switch tube, and the output end of the controlled switch tube is electrically connected with the output end of the charging pile.
CN202211396807.2A 2022-11-09 2022-11-09 Switch tube switch drive circuit and electric vehicle charging pile Pending CN115800971A (en)

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CN202211396807.2A CN115800971A (en) 2022-11-09 2022-11-09 Switch tube switch drive circuit and electric vehicle charging pile

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