CN212457333U - Clamp protection circuit, driving system and air conditioner - Google Patents
Clamp protection circuit, driving system and air conditioner Download PDFInfo
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- CN212457333U CN212457333U CN202020899380.8U CN202020899380U CN212457333U CN 212457333 U CN212457333 U CN 212457333U CN 202020899380 U CN202020899380 U CN 202020899380U CN 212457333 U CN212457333 U CN 212457333U
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Abstract
The utility model provides a clamper protection circuit, actuating system and air conditioner relates to clamper protection technical field. The clamp protection circuit comprises a driving module, a driving element, a clamp module and a time delay module, wherein the clamp module is electrically connected with the driving module, the driving element, the time delay module and a device to be driven respectively, and the driving element is electrically connected with the driving module, the time delay module and the device to be driven respectively. The driving module is used for controlling the to-be-driven device to be in a conducting state or a switching-off state through the driving element, the clamping module is used for conducting when the to-be-driven device is in the switching-off state and noise exists so as to discharge the noise, and the delay module is used for preventing the clamping module from conducting at the moment of switching-off of the to-be-driven device. The utility model provides a clamp protection circuit, actuating system and air conditioner have simple structure, with low costs and the more stable effect of circuit operation.
Description
Technical Field
The utility model relates to a clamp protection technical field particularly, relates to a clamp protection circuit, actuating system and air conditioner.
Background
SiC power switching Semiconductor devices such as SiC MOSFETs (Metal-Oxide-Semiconductor Field-Effect transistors), SiC BJTs (Bipolar Junction transistors) and the like are prone to malfunction due to interference on a gate in high-frequency applications because of the characteristics of low threshold voltage of gate-source driving voltage VGS and negative temperature coefficient. To prevent similar malfunctions, the driving of such devices is often designed with miller clamp protection.
Currently, for the miller clamp protection function design of such power switch semiconductor devices, it is often necessary to actively detect the gate voltage, and then control the operation of the miller clamp circuit switching tube by using a control unit such as a DSP (Digital Signal Processing) chip and a driving chip. On one hand, the circuit structure of such clamp protection circuits is relatively complex; on the other hand, since the control unit such as the DSP chip and the driving chip is used, the cost thereof is relatively high.
In summary, the conventional miller clamp protection circuit has the problems of relatively complex circuit structure and relatively high cost.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a clamp protection circuit, a driving system and an air conditioner, so as to solve the problems that the miller clamp protection circuit in the prior art is relatively complex in circuit structure and relatively high in cost.
In order to solve the above problem, in one aspect, the present invention provides a clamp protection circuit, which includes a driving module, a driving element, a clamping module and a delay module, wherein the clamping module is electrically connected to the driving module, the driving element, the delay module and a device to be driven, and the driving element is electrically connected to the driving module, the delay module and the device to be driven; wherein the content of the first and second substances,
the driving module is used for controlling the device to be driven to be in a conducting state or a switching-off state through the driving element;
the clamping module is used for conducting when the to-be-driven device is in an off state and noise exists so as to discharge the noise;
the time delay module is used for preventing the clamping module from being conducted at the moment when the device to be driven is turned off.
The clamp protection circuit provided by the application only comprises the driving module, the driving element, the clamp module and the delay module, so that the circuit structure is simple, and meanwhile, the cost is lower and the practical use is convenient because an additional voltage detection circuit and a corresponding control unit are not needed. And through the effect of the time delay module, the clamping module can be ensured not to act at the moment of turning off the device, so that the normal operation of the device can be ensured later, and the circuit operation is more stable.
Further, the clamping module includes a triode, a first resistor and a second resistor, an emitter of the triode is electrically connected with one end of the first resistor, the other end of the first resistor is electrically connected with the device to be driven and the driving element respectively, a base of the triode is electrically connected with one end of the second resistor, the other end of the second resistor is electrically connected with the driving module and the driving element respectively, and a collector of the triode is grounded.
Through setting up this clamp module, can be so that treating when the drive device noise appears, the triode can switch on automatically, and then treats the noise that the drive device produced and discharge, and then realized the clamp function under the prerequisite that does not increase extra voltage detection circuit and corresponding the control unit.
Furthermore, the delay module comprises a capacitor and a third resistor, one end of the capacitor and one end of the third resistor are both electrically connected with the base electrode of the triode, the other end of the capacitor is grounded, and the other end of the third resistor is respectively electrically connected with the driving element, the device to be driven and the first resistor.
Further, the resistance value of the first resistor is smaller than the resistance value of the driving element.
Through this mode of setting up, guarantee when carrying out the noise and bleed, mainly bleed through the clamp module, the speed of bleeding is faster.
Further, the driving module comprises a first switching tube and a second switching tube, the first switching tube is electrically connected with the power supply, the second switching tube, the driving element and the clamping module respectively, and the second switching tube is also grounded; wherein the content of the first and second substances,
the first switch tube and the second switch tube are both used for receiving the same control signal so as to conduct the first switch tube or the second switch tube.
Further, the first switch tube comprises an NPN triode and the second switch tube comprises a PNP triode, wherein a collector of the first switch tube is electrically connected to the power supply, and an emitter of the first switch tube is electrically connected to an emitter of the second switch tube, the driving element, and the clamping module, respectively; the collector of the second switch tube is grounded.
Further, the driving element includes a driving resistor.
In a second aspect, the present application further provides a driving system, where the driving system includes a device to be driven and the clamp protection circuit, the clamp protection circuit includes a driving module, a driving element, a clamping module and a delay module, the clamping module is electrically connected to the driving module, the driving element, the delay module and the device to be driven, and the driving element is electrically connected to the driving module, the delay module and the device to be driven; wherein the content of the first and second substances,
the driving module is used for controlling the device to be driven to be in a conducting state or a switching-off state through the driving element;
the clamping module is used for conducting when the to-be-driven device is in an off state and noise exists so as to discharge the noise;
the time delay module is used for preventing the clamping module from being conducted at the moment when the device to be driven is turned off.
The clamp protection circuit provided by the application only comprises the driving module, the driving element, the clamp module and the delay module, so that the circuit structure is simple, and meanwhile, the cost is lower and the practical use is convenient because an additional voltage detection circuit and a corresponding control unit are not needed. And through the effect of the time delay module, the clamping module can be ensured not to act at the moment of turning off the device, so that the normal operation of the device can be ensured later, and the circuit operation is more stable.
Further, the device to be driven comprises an MOS tube.
In a third aspect, an embodiment of the present application further provides an air conditioner, where the air conditioner includes the above-mentioned driving system.
Drawings
Fig. 1 is a block diagram of a miller protection circuit in the prior art.
Fig. 2 is a block diagram of a clamp protection circuit provided in the present application.
Fig. 3 is a circuit diagram of a clamp protection circuit provided in the present application.
Description of reference numerals:
100-clamp protection circuit; 110-a drive module; 120-a drive element; 130-a clamping module; 140-a delay module; q1-triode; r1 — first resistance; r2 — second resistance; c1-capacitance; r3 — third resistance; q2-first switch tube; q3-second switch tube.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
First embodiment
Referring to fig. 1, fig. 1 is a block diagram illustrating a miller protection circuit in the prior art. As can be seen from the figure, in the prior art, the MOS transistor is driven to be turned on or off by the driving unit, and when the MOS transistor is turned off, the gate voltage of the MOS transistor needs to be actively detected (a voltage detection circuit diagram is not shown), and then the action of the miller clamping module is controlled by the control unit such as the DSP chip and the driving chip, so as to realize the clamping function of the MOS transistor.
It can be understood that the circuit structure is relatively complex, and the circuit cost is relatively high because a voltage detection circuit and control units such as a DSP chip and a driving chip are needed.
In view of this, in order to solve the problems of complex circuit structure and high cost of the miller protection circuit in the prior art, the present application provides a clamp protection circuit, which does not need to use a voltage detection circuit, a DSP chip, a driving chip and other control units in the circuit in a circuit simplification manner, so that the circuit is simpler and the cost is saved.
The following is an exemplary description of the clamp protection circuit provided in the present application:
referring to fig. 2, as an alternative implementation manner, the clamp protection circuit 100 includes a driving module 110, a driving element 120, a clamping module 130, and a delay module 140, where the clamping module 130 is electrically connected to the driving module 110, the driving element 120, the delay module 140, and a device to be driven, respectively, and the driving element 120 is electrically connected to the driving module 110, the delay module 140, and the device to be driven, respectively. The driving module 110 is configured to control the device to be driven to be in an on state or an off state through the driving element 120, the clamping module 130 is configured to be turned on when the device to be driven is in the off state and noise exists, so as to release the noise, and the delay module 140 is configured to prevent the clamping module 130 from being turned on at the moment when the device to be driven is turned off.
It can be understood that the clamp protection circuit 100 provided by the present application has a simpler circuit structure and a lower cost because it does not need to add an additional voltage detection circuit and control units such as a DSP chip and a driving chip.
Meanwhile, due to the arrangement of the delay module 140, the clamp module 130 can be prevented from being turned on at the moment when the device to be driven is turned off, so that the clamp module 130 is turned on only when noise occurs in the device to be driven, and when the device to be driven is normally turned on and turned off, the normal operation of the device is not affected, and the stability of the circuit is improved.
In addition, the noise described in the present application refers to a voltage generated at the gate of the MOS transistor, for example, when the MOS transistor is in an off state, a voltage is generated at the gate due to static electricity, and at this time, the noise needs to be released, and whether the MOS transistor is turned on by mistake or breaks down easily affects the normal operation of the circuit.
Optionally, referring to fig. 3, the clamping module 130 includes a transistor Q1, a first resistor R1, and a second resistor R2, an emitter of the transistor Q1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to the device to be driven and the driving element 120, a base of the transistor Q1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the driving module 110 and the driving element 120, and a collector of the transistor Q1 is grounded.
The triode Q1 provided by the present application is a PNP triode, and it should be noted that the triode Q1 has three polarity terminals, namely, a base b, a collector c, and an emitter e, and when operating, the terminals respectively correspond to Ve, Vb, and Vc voltages. And the working characteristics of the PNP triode are as follows:
when Vb is more than or equal to Ve, the switching tube is cut off no matter what state Vc is;
when Vb is less than Ve, and Vb is more than or equal to Vc, the switching tube is conducted.
On the basis, it can be understood that when noise is generated at the gate of the MOS transistor, Vb < Ve of the transistor Q1 and Vc is 0, at this time, the transistor Q1 is turned on, the transistor Q1, the first resistor R1 and the gate of the MOS transistor form a loop, and the noise at the gate of the MOS transistor is discharged through the first resistor R1 and the transistor Q1.
Meanwhile, the driving module comprises a first switch tube Q2 and a second switch tube Q3, the first switch tube Q2 is electrically connected with the power supply, the second switch tube Q3, the driving element 120 and the clamping module 130 respectively, and the second switch tube Q3 is also grounded; the first switch Q2 and the second switch Q3 are both configured to receive the same control signal, so that the first switch Q2 or the second switch Q3 is turned on.
Alternatively, the first switching transistor Q2 may be an NPN transistor, and the second switching transistor Q3 may be a PNP transistor, wherein a collector of the first switching transistor Q2 is configured to be electrically connected to the power supply, and an emitter of the first switching transistor Q2 is electrically connected to an emitter of the second switching transistor Q3, the driving element 120, and the clamping module 130, respectively; the collector of the second switching tube Q3 is grounded.
Based on the above circuit structure, it can be understood that the control signal may be a PWM pulse signal, when the PWM signal is at a high level, the first transistor Q1 is turned on and the second transistor Q1 is turned off, and at this time, the driving voltage supplied by the power supply may drive the device to be driven (i.e., the MOS transistor in this application) to be turned on. At this time, in the clamp module 130, Vb > Ve, the transistor Q1 is not turned on, and the clamp module 130 does not affect the normal operation of the MOS transistor.
When the PWM signal is at a low level, the second transistor Q1 is turned on and the first transistor Q1 is turned off, at this time, the gate of the MOS transistor is grounded through the driving element 120, that is, the driving voltage is 0V, and the driving voltage drives the gate of the MOS transistor to turn off. On the basis, if the grid of the MOS tube has no interference noise, the voltage of Vb and Ve is 0V, and the triode Q1 is not conducted. If interference noise exists on the grid electrode of the MOS tube at the moment, Vb < Ve at the moment, the switching tube is conducted, so that the interference noise generated at the MOS tube is led into the ground after passing through the first resistor R1 and the triode Q1, the interference of the noise to the MOS tube is prevented, and the protection effect is achieved.
Note that, at this time, the second switching tube Q3 is turned on. Therefore, the actual MOS transistor is grounded through the loop of the driving element 120 and the second switching transistor Q3. In other words, when the gate of the MOS transistor generates interference noise, the discharging can be actually performed through two loops. One is a loop of the first resistor R1 and the transistor Q1, and the other is a loop of the driving element 120 and the second switching tube Q3.
However, in the circuit design, it is not desirable that the MOS transistor noise is released through the loop of the driving element 120 and the second switching transistor Q3. On the one hand, the loop of the driving element 120 and the second switching tube Q3 is mainly used for turning off the MOS transistor, so that the loop of the driving element 120 and the second switching tube Q3 should be made as far as possible to be used for turning off the MOS transistor in consideration of the independence of the functions of the different loops. On the other hand, the resistance of the driving element 120 in the circuit is relatively large, and the discharging capability thereof is poor, so if only the loop of the driving element 120 and the second switching tube Q3 is used for discharging noise, or the loop of the driving element 120 and the second switching tube Q3 is mainly used for discharging noise, the discharging is not timely, the voltage at the gate of the MOS transistor reaches the conducting voltage, and the problem of mis-conduction or even breakdown of the MOS transistor is caused.
For the above reasons, the resistance of the first resistor R1 is set to be smaller than the resistance of the driving element 120, and in order to implement that the noise generated by the gate of the MOS transistor is mainly discharged through the loop of the first resistor R1 and the transistor Q1, the difference between the resistances of the first resistor R1 and the driving element 120 is large, for example, the difference between the two resistances is at least one order of magnitude. With this arrangement, noise generated at the gate of the MOS transistor is mainly discharged through the loop of the first resistor R1 and the transistor Q1, and noise discharged through the driving element 120 and the second switching transistor Q3 is negligible.
As an implementation manner, the driving element 120 provided herein may be the driving resistor Rg, and of course, in some other embodiments, the driving element 120 may also be other energy consuming elements, for example, an element that converts electric energy into light energy. Moreover, the number of the driving resistors Rg is not limited in the present application, for example, the number of the driving resistors Rg may be one, or the number of the driving resistors Rg may be multiple, and the multiple resistors are connected in parallel or in series. Moreover, when the number of the driving resistors Rg is multiple, the resistance of the first resistor R1 is smaller than the total resistance of the driving resistors Rg.
Meanwhile, in the present application, a pin connecting the driving element 120 and the second switching transistor Q3 is named as pin 1, and a pin connecting the driving element 120 and the gate of the MOS transistor is named as pin 2. Through transient analysis of the circuit, at the moment of turning off the MOS transistor, the voltage of the pin 1 is grounded through the second switching transistor Q3, so that the voltage can be suddenly changed to 0, and the pin 2 is connected with the gate of the MOS transistor, so that the equivalent capacitor C1 in the MOS transistor needs to be discharged through the driving element 120, and therefore, the voltage of the pin 2 is not suddenly changed to 0.
On the basis, the base electrode of the triode Q1 is connected with the pin 1 through the second resistor R2, and the emitter electrode of the triode Q1 is connected with the pin 2 through the first resistor R1, so Ve is greater than Vb at the moment, the triode Q1 is conducted, and the discharge of the equivalent capacitor C1 in the MOS tube is conducted through a loop of the first resistor R1 and the triode Q1. Moreover, since the first resistor R1 is much smaller than the driving element 120, the discharging of the equivalent capacitor C1 in the MOS transistor is mainly performed through the loop of the first resistor R1 and the transistor Q1, and the discharging process is fast.
However, in the circuit design, both the turn-off time and the turn-on time of the MOS transistor are designed, for example, when the driving element 120 is turned on or off, the turn-on time and the turn-off time of the MOS transistor are 1ns and 1ns, and when the discharge is performed through the first resistor R1 and the loop of the transistor Q1, the discharge can be completed only by 0.1ns, so that the stable operation of the MOS transistor is not utilized.
In view of this, the clamp protection circuit 100 provided by the present application further includes a delay module 140, as an implementation manner, the delay module 140 includes a capacitor C1 and a third resistor R3, one end of the capacitor C1 and one end of the third resistor R3 are both electrically connected to the base of the transistor Q1, the other end of the capacitor C1 is grounded, and the other end of the third resistor R3 is electrically connected to the driving element 120, the device to be driven, and the first resistor R1.
Because the delay module 140 includes the capacitor C1, and the capacitor C1 is connected to the base of the transistor Q1, when the MOS transistor is turned on, the capacitor C1 charges, and at the moment the MOS transistor is turned off, due to the discharging function of the capacitor C1, Vb ═ Ve, the switching tube is not turned on, but performs a certain action delay, so that the MOS transistor can discharge through the driving element 120. When the MOS transistor is completely turned off, the transistor Q1 performs a normal switching operation. And the switching tube Q1 is ensured not to be switched on to influence the turn-off speed of the MOSFET at the turn-off moment of the MOS tube.
In summary, the clamp protection circuit 100 provided in the present application has a simple circuit structure, and does not require an additional voltage detection circuit and a corresponding control unit, so that the cost is lower and the practical use is facilitated. Meanwhile, through the action of the delay module 140, the clamping module 130 can be ensured not to act at the moment of turning off the device, and then the normal operation of the device can be ensured, so that the circuit operation is more stable.
Second embodiment
On the basis of the first embodiment, the present application further provides a driving system, where the driving system includes a device to be driven and the clamp protection circuit 100 described in the first embodiment, the clamp protection circuit 100 includes a driving module 110, a driving element 120, a clamping module 130, and a delay module 140, the clamping module 130 is electrically connected to the driving module 110, the driving element 120, the delay module 140, and the device to be driven, respectively, and the driving element 120 is electrically connected to the driving module 110, the delay module 140, and the device to be driven, respectively; the driving module 110 is configured to control the device to be driven to be in an on state or an off state through the driving element 120; the clamping module 130 is used for conducting when the device to be driven is in an off state and noise exists, so as to discharge the noise; the delay module 140 is used to prevent the clamp module 130 from turning on at the moment when the device to be driven is turned off.
Since the first embodiment has already described the clamp protection circuit 100 in detail, the working principle of the driving system will not be described in detail herein.
Third embodiment
On the basis of the second embodiment, the application also provides an air conditioner, and the air conditioner comprises the driving system provided by the second embodiment.
As an alternative implementation, the driving system can be applied to a booster circuit of an air conditioner.
To sum up, the embodiment of the present application further provides a clamp protection circuit, a driving system and an air conditioner, where the clamp protection circuit includes a driving module, a driving element, a clamp module and a delay module, the clamp module is electrically connected with the driving module, the driving element, the delay module and a device to be driven, and the driving element is electrically connected with the driving module, the delay module and the device to be driven. The driving module is used for controlling the to-be-driven device to be in a conducting state or a switching-off state through the driving element, the clamping module is used for conducting when the to-be-driven device is in the switching-off state and noise exists so as to discharge the noise, and the delay module is used for preventing the clamping module from conducting at the moment of switching-off of the to-be-driven device. The clamp protection circuit provided by the application only comprises the driving module, the driving element, the clamp module and the delay module, so that the circuit structure is simple, and meanwhile, the cost is lower and the practical use is convenient because an additional voltage detection circuit and a corresponding control unit are not needed. And through the effect of the time delay module, the clamping module can be ensured not to act at the moment of turning off the device, so that the normal operation of the device can be ensured later, and the circuit operation is more stable. Meanwhile, under the action of the delay module, the clamping module can be guaranteed not to act at the moment of turning off the device, and then the normal operation of the device can be guaranteed, so that the circuit is more stable in operation.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (10)
1. A clamp protection circuit is characterized in that the clamp protection circuit (100) comprises a driving module (110), a driving element (120), a clamping module (130) and a time delay module (140), wherein the clamping module (130) is electrically connected with the driving module (110), the driving element (120), the time delay module (140) and a device to be driven respectively, and the driving element (120) is electrically connected with the driving module (110), the time delay module (140) and the device to be driven respectively; wherein the content of the first and second substances,
the driving module (110) is used for controlling the device to be driven to be in an on state or an off state through the driving element (120);
the clamping module (130) is used for conducting when the device to be driven is in an off state and noise exists so as to discharge the noise;
the time delay module (140) is used for preventing the clamping module (130) from being turned on at the moment when the device to be driven is turned off.
2. The clamp protection circuit of claim 1, wherein the clamping module (130) comprises a transistor (Q1), a first resistor (R1) and a second resistor (R2), an emitter of the transistor (Q1) is electrically connected to one end of the first resistor (R1), the other end of the first resistor (R1) is electrically connected to the device to be driven and the driving element (120), respectively, a base of the transistor (Q1) is electrically connected to one end of the second resistor (R2), the other end of the second resistor (R2) is electrically connected to the driving module (110) and the driving element (120), respectively, and a collector of the transistor (Q1) is grounded.
3. The clamp protection circuit of claim 2, wherein the delay module (140) comprises a capacitor (C1) and a third resistor (R3), one end of each of the capacitor (C1) and the third resistor (R3) is electrically connected to the base of the transistor (Q1), the other end of the capacitor (C1) is grounded, and the other end of the third resistor (R3) is electrically connected to the driving element (120), the device to be driven, and the first resistor (R1), respectively.
4. The clamp protection circuit of claim 2, wherein the first resistor (R1) has a resistance value less than a resistance value of the driver element (120).
5. The clamp protection circuit of claim 1, wherein the driving module comprises a first switching transistor (Q2) and a second switching transistor (Q3), the first switching transistor (Q2) is electrically connected to a power supply, the second switching transistor (Q3), the driving element (120), and the clamp module (130), respectively, and the second switching transistor (Q3) is further grounded; wherein the content of the first and second substances,
the first switch tube (Q2) and the second switch tube (Q3) are both used for receiving the same control signal so as to conduct the first switch tube (Q2) or the second switch tube (Q3).
6. The clamp protection circuit of claim 5, wherein the first switching transistor (Q2) comprises an NPN transistor (Q1), and the second switching transistor (Q3) comprises a PNP transistor (Q1), wherein a collector of the first switching transistor (Q2) is configured to be electrically connected to the power supply, and an emitter of the first switching transistor (Q2) is electrically connected to an emitter of the second switching transistor (Q3), the driving element (120), and the clamp module (130), respectively; the collector of the second switch tube (Q3) is grounded.
7. The clamp protection circuit of claim 1, wherein the drive element (120) comprises a drive resistor.
8. A driving system, characterized in that the driving system comprises a device to be driven and the clamp protection circuit (100) according to any one of claims 1 to 7, the clamp protection circuit (100) comprises a driving module (110), a driving element (120), a clamping module (130) and a delay module (140), the clamping module (130) is electrically connected with the driving module (110), the driving element (120), the delay module (140) and the device to be driven respectively, and the driving element (120) is electrically connected with the driving module (110), the delay module (140) and the device to be driven respectively; wherein the content of the first and second substances,
the driving module (110) is used for controlling the device to be driven to be in an on state or an off state through the driving element (120);
the clamping module (130) is used for conducting when the device to be driven is in an off state and noise exists so as to discharge the noise;
the time delay module (140) is used for preventing the clamping module (130) from being turned on at the moment when the device to be driven is turned off.
9. The driving system according to claim 8, wherein the device to be driven comprises a MOS transistor.
10. An air conditioner characterized in that it comprises a drive system according to any one of claims 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020899380.8U CN212457333U (en) | 2020-05-25 | 2020-05-25 | Clamp protection circuit, driving system and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020899380.8U CN212457333U (en) | 2020-05-25 | 2020-05-25 | Clamp protection circuit, driving system and air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022213323A1 (en) * | 2021-04-08 | 2022-10-13 | 罗姆股份有限公司 | Clamping module, clamping method, switch unit, and electronic device |
| CN117118032A (en) * | 2023-09-13 | 2023-11-24 | 深圳市极测科技有限公司 | Battery reverse connection preventing circuit and battery reverse connection preventing system |
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2020
- 2020-05-25 CN CN202020899380.8U patent/CN212457333U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022213323A1 (en) * | 2021-04-08 | 2022-10-13 | 罗姆股份有限公司 | Clamping module, clamping method, switch unit, and electronic device |
| CN117118032A (en) * | 2023-09-13 | 2023-11-24 | 深圳市极测科技有限公司 | Battery reverse connection preventing circuit and battery reverse connection preventing system |
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