CN109889028B - Absorption capacitor pre-charging circuit and peak voltage absorption circuit - Google Patents
Absorption capacitor pre-charging circuit and peak voltage absorption circuit Download PDFInfo
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- CN109889028B CN109889028B CN201910251561.1A CN201910251561A CN109889028B CN 109889028 B CN109889028 B CN 109889028B CN 201910251561 A CN201910251561 A CN 201910251561A CN 109889028 B CN109889028 B CN 109889028B
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Abstract
According to the absorption capacitor pre-charging circuit and the peak voltage absorption circuit provided by the invention, the voltage at two ends of the absorption capacitor in the peak voltage absorption circuit of the power switch tube is charged to the direct current bus voltage of the bridge circuit through one power supply, and the absorption capacitor is prevented from discharging through the first anti-discharging unit arranged in the charging loop of the absorption capacitor, so that the absorption capacitor is pre-charged to the direct current bus voltage. When a bridge circuit is powered on or started for the first time, at the conducting moment of a power switch tube, the voltage born by a bridge arm corresponding to a complementary tube of the bridge tube rises to the direct-current bus voltage from the half direct-current bus voltage, and the absorption capacitor of the bridge arm corresponding to the complementary tube is pre-charged to the direct-current bus voltage, so that the current flowing into a gate pole of the bridge tube is zero, the voltage cannot be superposed on the gate pole of the bridge tube, and the serious short-circuit fault caused by the direct connection of an upper bridge arm and a lower bridge arm due to the misconduction of the bridge; and the capacitance value of the absorption capacitor does not need to be reduced, and the effective suppression of the peak voltage is ensured.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an absorption capacitor pre-charging circuit and a peak voltage absorption circuit.
Background
In a bridge circuit, such as a two-level bridge circuit, a multi-level bridge circuit, or a boost chopper circuit, the turn-off current of an internal power switching tube is large when the power switching tube is turned off, and a high turn-off peak voltage occurs due to the influence of parasitic inductance of a power circuit, so that a peak voltage absorption circuit needs to be arranged between two ends of a collector-gate (CG) of each power switching tube. In the peak voltage absorption circuits of various forms, absorption capacitors are provided to absorb and suppress the turn-off peak voltage, and the absorption capacitors need to be configured reasonably to achieve effective suppression of the turn-off peak voltage.
However, when the bridge circuit is powered on or turned on for the first time, the absorption capacitors of the complementary transistors corresponding to the bridge arms of a certain power switching tube are charged at the moment of turning on the power switching tube, and the current generated by charging generates a voltage drop on the gate resistance, so that the complementary transistors corresponding to the bridge arms are switched on by mistake, the upper and lower bridge arms are directly connected, and a serious short-circuit fault is caused.
In the prior art, the situation that upper and lower bridge arms are directly connected is usually avoided by reducing the capacitance value of the absorption capacitor, however, the problem that a large peak voltage cannot be effectively inhibited is caused by reducing the capacitance value of the absorption capacitor.
Disclosure of Invention
The invention provides an absorption capacitor pre-charging circuit and a peak voltage absorption circuit, which can avoid the situation that upper and lower bridge arms are directly connected when a bridge circuit is powered on for the first time or started on the premise of not reducing the capacitance value of an absorption capacitor.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
the invention provides an absorption capacitor pre-charging circuit which is connected with a peak voltage absorption circuit of a power switch tube in a bridge circuit; the absorption capacitor pre-charging circuit comprises: a power supply and a first discharge prevention unit; wherein:
the power supply is used for charging the voltage at two ends of the absorption capacitor in the peak voltage absorption circuit to the direct current bus voltage of the bridge circuit;
the first anti-discharge unit is arranged in a charging loop of the absorption capacitor and used for preventing the absorption capacitor from discharging.
Preferably, the method further comprises the following steps: a current limiting unit;
the current limiting unit is arranged in a charging loop of the absorption capacitor and used for controlling the charging duration of the absorption capacitor.
Preferably, the current limiting unit is a resistor.
Preferably, if the peak voltage absorption circuit is a peak voltage absorption circuit of a power switch tube arranged in a bridge arm on the bridge circuit, the power supply is a negative electrode of a direct current bus of the bridge circuit;
and if the peak voltage absorption circuit is a peak voltage absorption circuit arranged in a power switch tube in a lower bridge arm of the bridge circuit, the power supply is the positive electrode of a direct current bus of the bridge circuit.
Preferably, the method further comprises the following steps: and the second discharge prevention unit is used for preventing the positive electrode of the direct current bus from discharging to the negative electrode of the direct current bus through the absorption capacitor pre-charging circuit.
Preferably, the second discharge prevention unit is a diode.
Preferably, if the absorption capacitor pre-charging circuit comprises a current-limiting unit, and the peak voltage absorption circuit is a peak voltage absorption circuit of a power switching tube in a bridge arm on the bridge circuit, an anode of the diode is arranged between an anode of the direct current bus and the current-limiting unit, and a cathode of the diode is used for connecting a gate of the power switching tube in the upper bridge arm;
if the absorption capacitor pre-charging circuit comprises a current-limiting unit and the peak voltage absorption circuit is a peak voltage absorption circuit arranged in a power switch tube in a lower bridge arm of the bridge circuit, the anode of the diode is connected with the collector of the power switch tube in the lower bridge arm, and the cathode of the diode is arranged between the anode of the direct current bus and the absorption capacitor.
Preferably, the first discharge prevention unit is a diode.
In another aspect, the present invention further provides a peak voltage absorption circuit, including: an absorption capacitor and a pre-charging circuit of the absorption capacitor.
Preferably, the method further comprises the following steps: the circuit comprises a first resistor, a first diode, a first voltage stabilizing diode and a second voltage stabilizing diode; wherein:
the first resistor is connected with the absorption capacitor in parallel, one end of the first resistor in parallel is connected with the anode of the first voltage stabilizing diode and the cathode of the second voltage stabilizing diode, and the other end of the first resistor in parallel is connected with the cathode of the first voltage stabilizing diode and the cathode of the first diode;
the anode of the first diode is connected with the collector of the protected power switch tube;
and the anode of the second voltage stabilizing diode is connected with a driving circuit of the power switch tube.
The pre-charging circuit of the absorption capacitor charges the voltages at two ends of the absorption capacitor in the peak voltage absorption circuit of the power switch tube to the voltage of the direct current bus of the bridge circuit through a power supply, and is arranged in the charging loop of the absorption capacitor through the first anti-discharging unit to prevent the absorption capacitor from discharging so as to pre-charge the absorption capacitor to the voltage of the direct current bus. When a bridge circuit is powered on or started for the first time, at the conducting moment of a power switch tube, the voltage born by a bridge arm corresponding to a complementary tube of the bridge tube rises to the direct-current bus voltage from the half direct-current bus voltage, and the absorption capacitor of the bridge arm corresponding to the complementary tube is pre-charged to the direct-current bus voltage, so that the current flowing into a gate pole of the bridge tube is zero, the voltage cannot be superposed on the gate pole of the bridge tube, and the serious short-circuit fault caused by the direct connection of an upper bridge arm and a lower bridge arm due to the misconduction of the bridge; and the capacitance value of the absorption capacitor does not need to be reduced, and the effective suppression of the peak voltage is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an exemplary embodiment of a pre-charge circuit for an absorption capacitor;
FIG. 2 is a schematic diagram of another structure of a pre-charge circuit for absorption capacitors according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a pre-charge circuit for the absorption capacitor according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a peak voltage absorption circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The invention provides an absorption capacitor pre-charging circuit which avoids the situation that an upper bridge arm and a lower bridge arm are directly connected when a bridge circuit is powered on for the first time or started on the premise of not reducing the capacitance value of an absorption capacitor.
The absorption capacitor pre-charging circuit is connected with a peak voltage absorption circuit of a power switch tube in the bridge circuit; as shown in fig. 1, the absorption capacitor pre-charging circuit specifically includes: a power supply and a first discharge prevention unit; wherein:
the power supply is used for charging the voltage at two ends of the absorption capacitor C in the peak voltage absorption circuit to the direct current bus voltage Vdc of the bridge circuit;
the first anti-discharge unit is arranged in a charging loop of the absorption capacitor C and used for preventing the absorption capacitor C from discharging and ensuring that the absorption capacitor C can be precharged to the direct-current bus voltage Vdc.
When the bridge circuit is powered on or started for the first time, at the conducting moment of a power switch tube, the voltage born by a bridge arm corresponding to a complementary tube of the bridge circuit rises to the direct-current bus voltage Vdc from the half direct-current bus voltage Vdc/2, and the absorption capacitor of the bridge arm corresponding to the complementary tube is pre-charged to the direct-current bus voltage Vdc, so that the current flowing into a gate pole of the bridge circuit is zero, the voltage cannot be superposed on the gate pole of the bridge circuit, and the serious short-circuit fault caused by the direct connection of an upper bridge arm and a lower bridge arm due to the misconduction of the bridge circuit is.
The absorption capacitor pre-charging circuit provided by the embodiment can prevent the direct connection of the upper bridge arm and the lower bridge arm through the pre-charging of the absorption capacitor, ensure the safe working state of the power switch tube, and ensure the effective inhibition of the peak voltage without reducing the capacitance value of the absorption capacitor.
It is worth to be noted that, for various peak voltage absorption circuits without reducing the capacitance value of the absorption capacitor in the prior art, when the bridge circuit normally works, because the switching process of the bridge circuit is faster and the turn-off current is larger, the influence of the parasitic inductance of the power loop can cause higher turn-off peak voltage; the peak voltage charges the gate through absorption capacitors in various peak absorption circuits between two ends of the power switching tube CG, so that the power switching tube is turned off and delayed, and the peak voltage is reduced. When the bridge circuit is in overcurrent, interphase short circuit or direct-connection short circuit, the short-circuit protection circuit does not detect a fault signal or the response time of the short-circuit protection circuit is too long, so that the power tube cannot be protected in time, a large current is generated due to short circuit, so that the power switch tube is turned off hard to generate a high peak voltage, the peak voltage generates a current through the absorption capacitor to charge a gate pole, the turn-off time of the power switch tube is delayed, the peak voltage is reduced, but the gate-level voltage of the complementary tube corresponding to the bridge arm is increased, further the direct connection of the upper bridge arm and the lower bridge arm is caused, and a serious.
The absorption capacitor pre-charging circuit provided by the embodiment can reduce the voltage difference between the peak voltage of the power switching tube and the absorption capacitor thereof under the normal working condition and the short-circuit working condition by pre-charging the absorption capacitor, namely, reduce the voltage generated on the driving resistor, further greatly reduce the occurrence of the direct connection of the upper bridge arm and the lower bridge arm, and ensure the safe working state of the power switching tube; and the capacitance value of the absorption capacitor does not need to be reduced, and the effective suppression of the peak voltage is ensured.
In practical applications, preferably, as shown in fig. 2, the absorption capacitor pre-charging circuit further includes: a current limiting unit.
The current limiting unit is arranged in a charging loop of the absorption capacitor C and used for controlling the charging time of the absorption capacitor C.
Preferably, the current limiting unit is a resistor (e.g., R1 and R2 in fig. 3). Of course, the current limiting unit may also be implemented by other devices, as long as the current limiting function can be implemented, and all of them are within the protection scope of the present application.
In practical application, the charging time of the absorption capacitor C can be controlled by setting parameters of the current limiting unit.
Another embodiment of the present invention further provides a specific absorption capacitor pre-charging circuit, and on the basis of the above embodiments and fig. 1 and fig. 2, a preferred scheme is provided for the implementation form of the power supply, that is, the power is directly taken from the dc bus without an additional power supply; specifically, as shown in fig. 3:
if the peak voltage absorbing circuit is a peak voltage absorbing circuit of a power switch tube arranged in a bridge arm on the bridge circuit, the power supply in the corresponding absorbing capacitor pre-charging circuit 101 is a DC BUS negative electrode BUS-of the bridge circuit;
if the peak voltage absorption circuit is a peak voltage absorption circuit of a power switch tube arranged in a lower bridge arm of the bridge circuit, the power supply in the corresponding absorption capacitor pre-charging circuit 102 is a direct current BUS positive electrode BUS + of the bridge circuit.
Furthermore, when the power is taken from the dc BUS, attention needs to be paid to avoid that the dc BUS positive electrode BUS + discharges to the dc BUS negative electrode BUS-through the corresponding absorption capacitor pre-charging circuit, and therefore, more preferably, the absorption capacitor pre-charging circuit further includes: and second discharge prevention units such as diodes D3 and D4 shown in fig. 3. Of course, in practical applications, the second anti-discharge unit may also be implemented by using other devices, such as a controllable triode or an IGBT (Insulated Gate Bipolar Transistor), and the like, which is not specifically limited herein and is within the protection scope of the present application depending on the application environment. Specifically, the method comprises the following steps:
if the absorption capacitor pre-charging circuit comprises a current-limiting unit and the peak voltage absorption circuit is a peak voltage absorption circuit of a power switch tube in a bridge arm arranged on the bridge circuit, the anode of the second discharge prevention unit diode (D3 shown in figure 3) is arranged between the positive electrode BUS + of the direct current BUS and the current-limiting unit, and the cathode of the second discharge prevention unit diode is used for connecting the gate pole of the power switch tube in the bridge arm; and further can prevent direct current BUS positive pole BUS + from passing through the current limiting unit (R1 shown in figure 3) to direct current BUS negative pole BUS-discharge.
If the absorption capacitor pre-charging circuit comprises a current-limiting unit and the peak voltage absorption circuit is a peak voltage absorption circuit arranged in a power switch tube in a lower bridge arm of the bridge circuit, the anode of the second discharge prevention unit diode (shown as D4 in fig. 3) is connected with the collector of the power switch tube in the lower bridge arm, and the cathode of the second discharge prevention unit diode is arranged between the positive electrode BUS + of the direct current BUS and the absorption capacitor; and further can prevent the positive BUS + of the direct current BUS from discharging to the negative BUS-of the direct current BUS through a current limiting unit (R2 shown in figure 3) and a corresponding power switch tube.
Fig. 3 shows a specific example:
in an absorption capacitor pre-charging circuit 101 equipped with a peak voltage absorption circuit of a power switch tube in a bridge arm on a bridge circuit: the power supply is a direct current BUS cathode BUS-, the first anti-discharge unit is a diode D1, the current limiting unit is a resistor R1, and the second anti-discharge unit is a diode D3; and one end of the absorption capacitor C1 corresponding to the absorption capacitor C is connected with a direct current BUS positive electrode BUS +, and the other end of the absorption capacitor C1 is connected with a direct current BUS negative electrode BUS-through a diode D1 and a resistor R1 on the one hand, and is connected with a gate pole of a power switch tube in an upper bridge arm through a diode D3 on the other hand. In practical applications, the positions of the diode D1, the resistor R1, and the diode D3 are not limited to this, for example, the diode D1, the resistor R1, and the absorption capacitor C1 may be in a loop, and the front and back order is not fixed; as long as the respective corresponding functions can be realized, depending on the specific application environment, the method is within the protection scope of the present application.
In an absorption capacitor pre-charging circuit 102 equipped with a peak voltage absorption circuit of a power switch tube in a lower bridge arm of a bridge circuit: the power supply is a direct current BUS anode BUS +, the first anti-discharge unit is a diode D2, the current limiting unit is a resistor R2, and the second anti-discharge unit is a diode D4; and one end of the absorption capacitor C2 corresponding to the absorption capacitor C is connected with the gate of the power switch tube in the lower bridge arm, the other end of the absorption capacitor C2 is respectively connected with the cathode of the diode D2 and the cathode of the diode D4, the anode of the diode D2 is connected with the negative electrode BUS-of the direct current BUS through the resistor R2, and the anode of the diode D4 is connected with the collector of the power switch tube in the lower bridge arm, namely, the middle point of the bridge arm. In practical applications, the positions of the diode D2, the resistor R2, and the diode D4 are not limited to this, for example, the diode D2, the resistor R2, and the absorption capacitor C2 may be in a loop, and the front and back order is not fixed; as long as the respective corresponding functions can be realized, depending on the specific application environment, the method is within the protection scope of the present application.
Taking the instant starting condition of the bridge circuit as an example, assuming that the dc BUS voltage is the voltage Vdc between the dc BUS positive BUS + the dc BUS negative BUS-, the working process of the snubber capacitor pre-charge circuit shown in fig. 3 is as follows:
for a power switch tube in an upper bridge arm of a bridge circuit, namely an upper tube IGBT _ UP in fig. 3, a driving signal Driver _ UP is input to a gate pole of the power switch tube through a gate pole resistor; the positive electrode BUS + of the direct current BUS charges a absorption capacitor C1 through a resistor R1 and a diode D1, and charges the voltage of the absorption capacitor C1 to Vdc. For a power switch tube in a lower bridge arm of the bridge circuit, namely a lower tube IGBT _ DW in FIG. 3, a driving signal Driver _ DW is input to a gate electrode of the power switch tube through a gate electrode resistor; the positive electrode BUS + of the direct current BUS charges a absorption capacitor C2 through a resistor R2 and a diode D2, and charges the voltage of the absorption capacitor C2 to Vdc.
When the upper tube IGBT _ UP (or the lower tube IGBT _ DW) is started, the voltage Vce borne by the complementary tube IGBT _ DW (or the IGBT _ UP) is increased to Vdc from Vdc/2, but the voltages of the absorption capacitors C1 and C2 are charged to Vdc, according to theoretical calculation, the current i flowing into the gate pole of the complementary tube IGBT _ DW is 0A, and the voltage is not superposed on the gate pole of the complementary tube IGBT _ DW, so that the complementary tube IGBT _ UP is in a closed state, the phenomenon of mis-conduction and direct-through is avoided, and the safe working state of the power switch tube can be ensured.
Aiming at the peak voltage generated by the normal working condition and the short-circuit working condition of the power switch tube, the circuit reduces the voltage difference between the peak voltage and the corresponding absorption capacitor by pre-charging the absorption capacitors C1 and C2, namely, reduces the voltage generated on the corresponding driving resistor, thereby ensuring the safe working state of the power switch tube.
In summary, no matter what the specific topology of the peak voltage absorption circuit is, the embodiment can ensure the safe working state of the power switch tube by precharging the absorption capacitor thereof, and can effectively suppress the turn-off peak voltage.
It should be noted that fig. 3 is only a specific example, and is not an exclusive implementation manner, and the selection and the location of each device may depend on the specific application environment, and may implement their respective functions, all of which are within the protection scope of the present application.
The rest of the structure and the principle are the same as those of the above embodiments, and are not described in detail here.
Another embodiment of the present invention further provides a spike voltage absorption circuit, which includes, regardless of its specific topology: an absorption capacitor and a pre-charging circuit for the absorption capacitor as described in any of the above embodiments.
The specific structure and the operation principle of the absorption capacitor pre-charging circuit can be obtained by referring to the above embodiments, and are not described in detail herein.
A specific example is shown in fig. 4, and the spike voltage absorbing circuit further includes, on the basis of including the absorbing capacitor C and an absorbing capacitor pre-charging circuit (not shown in the figure): a first resistor R, a first diode D, a first zener diode DZ1, and a second zener diode DZ 2; wherein:
the first resistor R is connected with the absorption capacitor C in parallel, one end of the first resistor R in parallel is connected with the anode of the first voltage-stabilizing diode DZ1 and the cathode of the second voltage-stabilizing diode DZ2, and the other end of the first resistor R in parallel is connected with the cathode of the first voltage-stabilizing diode DZ1 and the cathode of the first diode D;
the anode of the first diode D is connected with the collector of the protected power switch tube;
the anode of the second zener diode DZ2 is connected to the driving circuit of the power switch tube.
The specific structure and connection mode of the peak voltage absorption circuit and the driving circuit are the prior art, and are not described in detail here.
Moreover, fig. 4 is also only an example, and in practical applications, a specific implementation form of the peak voltage absorbing circuit may adopt any suitable topology in the prior art, which is not described herein again and is within the protection scope of the present application.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. The pre-charging circuit of the absorption capacitor is characterized in that the pre-charging circuit is connected with a peak voltage absorption circuit of a power switch tube in a bridge circuit; the absorption capacitor pre-charging circuit comprises: a power supply and a first discharge prevention unit; wherein:
the power supply is used for charging the voltage at two ends of the absorption capacitor in the peak voltage absorption circuit to the direct current bus voltage of the bridge circuit, so that the current flowing into the gate pole of the power switch tube of the bridge circuit is zero when the bridge circuit is powered on or started for the first time;
the first anti-discharge unit is arranged in a charging loop of the absorption capacitor and used for preventing the absorption capacitor from discharging.
2. The sinking capacitor pre-charge circuit of claim 1, further comprising: a current limiting unit;
the current limiting unit is arranged in a charging loop of the absorption capacitor and used for controlling the charging duration of the absorption capacitor.
3. The snubber capacitor pre-charge circuit of claim 2, wherein the current limiting unit is a resistor.
4. The absorption capacitor pre-charging circuit according to any one of claims 1 to 3, wherein if the peak voltage absorption circuit is a peak voltage absorption circuit of a power switch tube arranged in a bridge arm of the bridge circuit, the power supply is a negative electrode of a DC bus of the bridge circuit;
and if the peak voltage absorption circuit is a peak voltage absorption circuit arranged in a power switch tube in a lower bridge arm of the bridge circuit, the power supply is the positive electrode of a direct current bus of the bridge circuit.
5. The sinking capacitor pre-charge circuit of claim 4, further comprising: and the second discharge prevention unit is used for preventing the positive electrode of the direct current bus from discharging to the negative electrode of the direct current bus through the absorption capacitor pre-charging circuit.
6. The absorption capacitor pre-charge circuit as claimed in claim 5, wherein the second discharge prevention unit is a diode.
7. The pre-charging circuit for absorption capacitor as claimed in claim 6, wherein if the pre-charging circuit for absorption capacitor includes a current-limiting unit, and the peak voltage absorbing circuit is a peak voltage absorbing circuit disposed in a power switch tube in a bridge arm of the bridge circuit, an anode of the diode is disposed between the positive electrode of the dc bus and the current-limiting unit, and a cathode of the diode is used to connect to a gate of the power switch tube in the upper bridge arm;
if the absorption capacitor pre-charging circuit comprises a current-limiting unit and the peak voltage absorption circuit is a peak voltage absorption circuit arranged in a power switch tube in a lower bridge arm of the bridge circuit, the anode of the diode is connected with the collector of the power switch tube in the lower bridge arm, and the cathode of the diode is arranged between the anode of the direct current bus and the absorption capacitor.
8. The pre-charge circuit for absorption capacitor as claimed in any one of claims 1 to 3, wherein the first discharge prevention unit is a diode.
9. A spike voltage absorption circuit, comprising: a snubber capacitor and a snubber capacitor pre-charge circuit as claimed in any one of claims 1 to 8.
10. The spike voltage absorption circuit of claim 9 further comprising: the circuit comprises a first resistor, a first diode, a first voltage stabilizing diode and a second voltage stabilizing diode; wherein:
the first resistor is connected with the absorption capacitor in parallel, one end of the first resistor in parallel is connected with the anode of the first voltage stabilizing diode and the cathode of the second voltage stabilizing diode, and the other end of the first resistor in parallel is connected with the cathode of the first voltage stabilizing diode and the cathode of the first diode;
the anode of the first diode is connected with the collector of the protected power switch tube;
and the anode of the second voltage stabilizing diode is connected with a driving circuit of the power switch tube.
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| CN110233566A (en) * | 2019-07-05 | 2019-09-13 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN112311215B (en) * | 2019-08-02 | 2021-10-15 | 台达电子企业管理（上海）有限公司 | Clamping circuit and power module |
| CN210403910U (en) * | 2019-09-30 | 2020-04-24 | 潍柴动力股份有限公司 | Fault monitoring system for electric pile module |
| CN110854835A (en) * | 2019-11-27 | 2020-02-28 | 深圳市佳士科技股份有限公司 | Spike voltage absorption circuit and power supply circuit |
| CN111130376B (en) * | 2020-01-17 | 2021-05-14 | 山特电子（深圳）有限公司 | Three-phase pulse width modulation rectifying circuit and pre-charging method thereof |
| CN112701746B (en) * | 2020-12-11 | 2023-10-03 | 珠海格力电器股份有限公司 | Battery equalization control method and device, storage medium and electronic device |
| CN114430193B (en) * | 2021-12-30 | 2025-01-28 | 中国船舶重工集团公司第七一九研究所 | Supercapacitor charging and discharging control system based on nonlinear PI and peak current |
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| US5841647A (en) * | 1996-10-07 | 1998-11-24 | Kabushiki Kaisha Toshiba | Power conversion system |
| CN203574535U (en) * | 2013-10-16 | 2014-04-30 | 王达开 | High-efficiency voltage limiting circuit for power switching devices in series connection |
| CN103501109B (en) * | 2013-10-25 | 2016-03-23 | 北京交通大学 | There is converter bridge arm circuit and the converter of energy active feedback absorption loop |
| CN105450032A (en) * | 2015-12-30 | 2016-03-30 | 广西师范大学 | Leakage inductance energy feedback digital control device for DC-DC converter |
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| CN202488344U (en) * | 2012-03-27 | 2012-10-10 | 刘思颖 | AC stabilizing current power supply circuit |
| CN105406747A (en) * | 2015-12-25 | 2016-03-16 | 成都麦隆电气有限公司 | NPC three-level inner tube lossless voltage-sharing clamping circuit |
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