CN214314566U - MOS (metal oxide semiconductor) tube protection circuit for load short-circuit detection - Google Patents
MOS (metal oxide semiconductor) tube protection circuit for load short-circuit detection Download PDFInfo
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- CN214314566U CN214314566U CN202120322603.9U CN202120322603U CN214314566U CN 214314566 U CN214314566 U CN 214314566U CN 202120322603 U CN202120322603 U CN 202120322603U CN 214314566 U CN214314566 U CN 214314566U
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Abstract
The utility model relates to a protection circuit technical field, in order to solve the technical problem who damages the MOS pipe because of the load short circuit among the prior art, the utility model provides a MOS pipe protection circuit for load short circuit detects, including control module, detection module, switch tube Q1, switch tube Q2, current-limiting resistance R1 and switch SW, control module respectively with detection module, switch tube Q1's grid, switch tube Q2's grid and switch SW are connected, detection module is connected with battery positive pole B +, output port P + respectively, switch tube Q2's drain electrode passes through current-limiting resistance R1 and detection module, switch tube Q1's drain electrode and output port P-are connected, switch tube Q1's source electrode, switch tube Q2's source electrode, switch SW and battery negative pole B-are connected. Switch-on of switch tube Q2 is conducted earlier and is detected, and control module makes switch tube Q1 conduct again when judging that the load does not have the short circuit through detection module, avoids damaging the MOS pipe because of the load short circuit.
Description
Technical Field
The utility model relates to a protection circuit technical field, concretely relates to MOS manages protection circuit for load short circuit detects.
Background
With the development and application of scientific technology, in the field of secondary lithium battery application, the secondary lithium battery technology is rapidly developed, the power secondary lithium battery is also rapidly developed and applied, and a method for controlling large current by using small current appears in application, and is generally realized by using a weak current lock switch.
In the use process of the weak current lock switch technology, if a load is damaged, for example, under the condition of internal short circuit of the load, a user does not know to open the weak current lock, and as a result, a BMS (Battery Management System, abbreviated in chinese) of the secondary lithium Battery is burnt, and even the secondary lithium Battery is burnt and exploded. Particularly, a hardware lithium battery management system is not provided with any detection device, so that a secondary lithium battery short-circuit accident is more easily caused.
The problem to be solved in the existing hardware BMS is that the hardware BMS is hard-reactance depending on the quality and the quantity of the MOS tubes, and the hard-reactance technology has certain risks in principle, the MOS tubes have the Maitreya effect when being turned on and turned off, and the MOS tubes are easily damaged by large current flowing through the MOS tubes at the moment so as to cause the hardware BMS to fail. Once the hardware BMS fails, the entire secondary lithium battery is at risk of failure, which may cause safety accidents and even endanger life safety.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem who damages the MOS pipe because of the load short circuit among the prior art, the utility model provides a MOS pipe protection circuit for load short circuit detects, in order to solve this problem, let earlier switch tube Q2 of series connection current limiting resistance R1 switch on and detect, give control module effective signal back at the detection module feedback, control module judges that the load is controlled again when not having the short circuit and is used for main discharge's switch tube Q1 to switch on, the short circuit has been detected earlier, just can not open main discharge MOS pipe, reach the purpose of avoiding damaging the MOS pipe because of the load short circuit.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a MOS tube protection circuit for load short-circuit detection comprises a control module, a detection module, a switching tube Q1, a switching tube Q2, a current-limiting resistor R1 and a switch SW, wherein the control module is respectively connected with the detection module, a grid electrode of the switching tube Q1, a grid electrode of the switching tube Q2 and a 2 nd end of the switch SW, the detection module is respectively connected with a battery anode B + and an output port P +, a drain electrode of the switching tube Q2 is connected with the detection module, a drain electrode of the switching tube Q1 and an output port P < - > through the current-limiting resistor R1, a source electrode of the switching tube Q1, a source electrode of the switching tube Q2 and a 1 st end of the switch SW are connected with a battery cathode B < - >; the detection module is used for short-circuit detection, the control module is used for receiving a switching signal of the switch SW and a detection signal of the detection module, controlling the switching tube Q1 and the switching tube Q2, the switching tube Q1 and the switching tube Q2 are used for realizing on-off according to the control signal of the control module, the switching tube Q1 is used for on-off of main discharge, the switching tube Q2 is used for on-off of short-circuit detection discharge, the output port P + is used for connecting the anode of a load, and the output port P-is used for connecting the cathode of the load.
Preferably, the detection module includes an optical coupler Q3 and an optical coupler Q4, a collector of the optical coupler Q3 is connected with the output port P + through a resistor R7, an emitter of the optical coupler Q3 is connected with an anode of the optical coupler Q4, a cathode of the optical coupler Q3 is grounded, an anode of the optical coupler Q3 is connected with the control module through a current-limiting resistor R5, a cathode of the optical coupler Q4 is connected with a drain of the switching tube Q2 through a current-limiting resistor R1, an emitter of the optical coupler Q4 is grounded, a collector of the optical coupler Q4 is connected with the control module, and a negative electrode B-of the battery is grounded.
Preferably, the control module comprises a single chip microcomputer U1, a 1 st pin of the single chip microcomputer U1 is a power supply end, a 3 rd pin and a 6 th pin of the single chip microcomputer U1 are used for detecting a level state, a 4 th pin, a 5 th pin and a 7 th pin of the single chip microcomputer U1 are used for outputting high and low levels, and an 8 th pin of the single chip microcomputer U1 is a grounding end; the 3 rd pin or the 6 th pin of the singlechip U1 is connected with the 2 nd end of the switch SW, the 3 rd pin or the 6 th pin of the singlechip U1 is connected with the collector of the optocoupler Q4, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the grid of the switch tube Q1 through the current-limiting resistor R2, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the grid of the switch tube Q2 through the current-limiting resistor R3, and the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the anode of the optocoupler Q3 through the current-limiting resistor R5; the 3 rd pin or the 6 th pin of the singlechip U1 can not be connected with the 2 nd end of the switch SW and the collector of the optocoupler Q4 at the same time, and the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 can not be connected with two or more resistance elements in the current-limiting resistor R2, the current-limiting resistor R3 and the current-limiting resistor R5 at the same time.
Furthermore, the 3 rd pin of the single chip microcomputer U1 is connected with the 2 nd end of the switch SW, the 6 th pin of the single chip microcomputer U1 is connected with the collector of the optocoupler Q4, the 4 th pin of the single chip microcomputer U1 is connected with the gate of the switch tube Q1 through the current limiting resistor R2, the 5 th pin of the single chip microcomputer U1 is connected with the gate of the switch tube Q2 through the current limiting resistor R3, and the 7 th pin of the single chip microcomputer U1 is connected with the anode of the optocoupler Q3 through the current limiting resistor R5.
Preferably, the 3 rd pin of the single chip microcomputer U1 is connected with the power supply VCC through a pull-up resistor R4, and the 6 th pin of the single chip microcomputer U1 is connected with the power supply VCC through a pull-up resistor R6.
Preferably, a diode D1 is further connected between the emitter of the optocoupler Q3 and the resistor R7, the cathode of the diode D1 is connected to the emitter of the optocoupler Q3, and the anode of the diode D1 is connected to the resistor R7.
Further, the switching tube Q1 and the switching tube Q2 are NMOS tubes. Implement the utility model discloses the beneficial effect who brings is:
the utility model provides a pair of MOS pipe protection circuit for load short circuit detects, switch tube Q2 through series connection current limiting resistor R1 switches on earlier and detects, give back to control module effective signal at detection module, control module judges that the load is used for main discharging switch tube Q1 to switch on when not having the short circuit, switch tube Q1 has been guaranteed can not open under the outside load short circuit condition, avoid taking place the damage of main MOS pipe, damage hardware BMS, the incident that leads to the burning and the explosion of lithium cell even. In addition, implement the utility model has the advantages of with low costs, simple reliable and economic benefits are high.
Drawings
Fig. 1 is a schematic structural block diagram provided in an embodiment of the present invention;
fig. 2 is a specific circuit diagram provided in an embodiment of the present invention.
In the figure: a control module 10; a detection module 20.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, fig. 1 is a schematic structural block diagram provided in an embodiment of the present invention, which includes a control module 10, a detection module 20, a switch tube Q1, a switch tube Q2, a switch SW, a current limiting resistor R1, a battery anode B +, a battery cathode B-, an output port P +, and an output port P-;
the control module 10 is used for overall control, the detection module 20 is used for short-circuit detection, the switch SW is a manually controlled weak current switch, the control module 10 is used for receiving a switch signal of the switch SW and a detection signal of the detection module 20, and controlling the switch tube Q1 and the switch tube Q2, the switch tube Q1 and the switch tube Q2 are used for realizing on-off according to the control signal of the control module 10, the switch tube Q1 is used for on-off of main discharge, the switch tube Q2 is used for on-off of short-circuit detection discharge, the output port P + is used for connecting the anode of a load, and the output port P-is used for connecting the cathode of the load.
The control module 10 is respectively connected with the detection module 20, the grid of the switching tube Q1, the grid of the switching tube Q2, the switch SW, the current limiting resistor R1, the battery cathode B-and the output port P-; the battery anode B + is connected with the output port P +, the battery cathode B-is connected with the detection module 20 and the output port P-through a switching tube Q1, and the battery cathode B-is connected with the detection module 20 through a switching tube Q2 and a current-limiting resistor R1 in sequence; the detection module 20 is respectively connected with the battery anode B + and the output port P-; one end of the switch SW is connected to the control module 10, and the other end is connected to the battery cathode B-.
When the load is short-circuited, namely the output port P + and the output port P-are short-circuited, the voltage between the output port P + and the output port P-is equivalent to zero; when the load is not short-circuited, namely the output port P + and the output port P-are not short-circuited, the voltage between the output port P + and the output port P-is not zero.
When the switch SW is turned off, the control module 10 controls the switch Q1 and the switch Q2 to be in an off state, and the battery does not discharge to the outside.
When the switch SW is turned on, the control module 10 controls the switch Q2 to be in a conducting state, and the detection module 20 detects a loop signal, so that the battery is discharged to the outside through the switch Q2 and the current limiting resistor R1.
Under the condition that the output port P + and the output port P-of the battery pack are not short-circuited, the switching tube Q2 is conducted, current flows through the detection module 20, and flows back to the cathode B-of the battery through the current limiting resistor R1 and the switching tube Q2.
When the current passes through the detection module 20, the detection module 20 will send a signal to the control module 10, and the control module 10 determines through logic analysis that there is no short circuit between the output port P + and the output port P-, and then controls the switching tube Q1 for main discharge to be in a conducting state, so that the battery will supply power to the external output.
Under the condition that the output port P + and the output port P-of the battery are short-circuited, the switching tube Q2 is conducted, the detection module 20 is directly bypassed, and the current does not pass through the detection module 20, directly passes through the current-limiting resistor R1 and the switching tube Q2 and flows back to the cathode B-of the battery.
The detection module 20 does not send a signal to the control module 10, and the control module 10 determines that the output ports P + and P-of the battery are short-circuited through logic analysis, and controls the switching tube Q1 for main discharge to be in a cut-off state, so that the battery is turned off to supply power to the external output. Therefore, the reliable opening of the switch tube Q1 is ensured, the short circuit of a load end cannot occur, and the switch tube Q1 is also opened, so that the switch tube Q1 is damaged.
Referring to fig. 2, fig. 2 is the specific circuit diagram that the embodiment of the utility model provides, control module 10 includes singlechip U1, and singlechip U1's 1 st foot is the power end, and singlechip U1's 3 rd foot is used for detecting the level state, and singlechip U1's 4 th foot, 5 th foot and 7 th foot are used for exporting the high-low level, and singlechip U1's 6 th foot is used for detecting the level state, and singlechip U1's 8 th foot is the earthing terminal.
In an embodiment of the present invention, the 2 nd pin of the single chip microcomputer U1 is not used in suspension, but may be used for other purposes, and is not limited herein.
The 1 st foot of singlechip U1 is connected with power VCC, and the 8 th foot of singlechip U1 is connected with ground, and the 1 st foot of singlechip U1 passes through filter capacitor C1 ground connection, and the 3 rd foot of singlechip U1 passes through switch SW ground connection, and the 1 st end of switch SW is ground connection, and the 2 nd end of switch SW is connected with the 3 rd foot of singlechip U1.
The 3 rd pin and the 6 th pin of the singlechip U1 are used for detecting the level state, and the 4 th pin, the 5 th pin and the 7 th pin of the singlechip U1 are used for outputting high and low levels. Because the singlechip U1 can be controlled by programming, the hardware circuits connected with the pins for detecting the level and outputting the level can be exchanged, and only the program needs to be modified.
The 3 rd pin or the 6 th pin of the singlechip U1 is connected with the 2 nd end of the switch SW, the 3 rd pin or the 6 th pin of the singlechip U1 is connected with the collector of the optocoupler Q4, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the grid of the switch tube Q1 through the current-limiting resistor R2, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the grid of the switch tube Q2 through the current-limiting resistor R3, and the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is connected with the anode of the optocoupler Q3 through the current-limiting resistor R5;
it should be noted that in the one-to-one detection or control, the 3 rd pin or the 6 th pin of the single chip U1 cannot be simultaneously connected to the 2 nd terminal of the switch SW and the collector of the optocoupler Q4, and the 4 th pin, the 5 th pin or the 7 th pin of the single chip U1 cannot be simultaneously connected to two or more of the above-mentioned resistance elements of the current limiting resistor R2, the current limiting resistor R3 and the current limiting resistor R5.
The utility model discloses an in an embodiment, singlechip U1 is inside from taking pull-up resistance, but inside pull-up resistance is generally great, lead to pull-up ability weaker, though also can use with inside pull-up resistance, but stability can be less than a little, in order to improve pull-up ability, this embodiment has set up outside pull-up resistance R4 and R6, singlechip U1's 3 rd foot is connected with the power VCC through pull-up resistance R4, be used for providing the high level of acquiescence for the 1 st foot, still be connected with pull-up resistance R6 between singlechip U1's 6 th foot and the power VCC, be used for providing the high level of acquiescence for the 6 th foot.
In an embodiment of the present invention, the 4 th pin of the single chip U1 is connected to the gate G of the switch tube Q1 through the current limiting resistor R2, the 5 th pin of the single chip U1 is connected to the gate G of the switch tube Q2 through the current limiting resistor R3, the 6 th pin of the single chip U1 is connected to the collector of the optocoupler Q4, and the 7 th pin of the single chip U1 is connected to the anode of the optocoupler Q3 through the current limiting resistor R5;
the source S of the switch tube Q1 is connected with the cathode B-of the battery, the cathode B-of the battery is grounded, and the drain D of the switch tube Q1 is connected with the output port P-;
the source S of the switching tube Q2 is connected with the cathode B-of the battery, and the drain D of the switching tube Q2 is connected with the output port P-through the current limiting resistor R1;
the emitter of the optocoupler Q4 is grounded, the cathode of the optocoupler Q4 is connected with the output port P-, and the anode of the optocoupler Q4 is connected with the emitter of the optocoupler Q3;
the cathode of the optocoupler Q3 is grounded, and the collector of the optocoupler Q3 is connected with the battery anode B + and the output port P + through a resistor R7.
For further circuit protection, a diode D1 is connected between the collector of the optocoupler Q3 and the resistor R7, the cathode of the diode D1 is connected to the collector of the optocoupler Q3, and the anode of the diode D1 is connected to the battery anode B + and the output port P + through the resistor R7.
In an embodiment of the present invention, the switching tube Q1 and the switching tube Q2 are NMOS tubes.
In the case of no short circuit of the load:
when the switch SW is closed and conducted, the 3 rd pin of the singlechip U1 is grounded, the high level is changed into the low level, the 3 rd pin of the singlechip U1 detects the low level, through logic analysis, the 5 th pin of the singlechip U1 outputs the high level to pass through the current limiting resistor R3 to conduct the switching tube Q2, meanwhile, the 7 th pin of the singlechip U1 outputs the high level to pass through the current limiting resistor R5, the light emitting diode in the optocoupler Q3 emits light to enable the collector and the emitter of the phototriode in the optocoupler Q3 to be conducted, because the load has no short circuit condition, the voltage between the output port P + and the output port P-is not zero, the current sequentially passes through the resistor R7, the diode D1, the optocoupler Q3, the optocoupler Q4, the current limiting resistor R1 and the switching tube Q2 to the cathode B of the battery, the light emitting diode in the optocoupler Q4 emits light to enable the collector and the emitter of the phototriode in the phototriode Q4, the collector and the emitter of the phototriode are conducted to pull the high level of the 6 th pin of the singlechip U1 down to be changed into the low level, at this time, the 6 th pin of the singlechip U1 detects a low level, and through logic analysis, the external load is considered not to be short-circuited. The 4 th pin of the singlechip U1 outputs high level to pass through the current limiting resistor R2, the switch tube Q1 is opened, the switch tube Q1 is conducted, and the battery can discharge to the load.
In the case of a short circuit of the load:
when the switch SW is closed and conducted, the 3 rd pin of the single chip microcomputer U1 is grounded, the high level is changed into the low level, the 3 rd pin of the single chip microcomputer U1 detects the low level, through logic analysis, the 5 th pin of the single chip microcomputer U1 outputs the high level, the high level is conducted through the current limiting resistor R3, the switching tube Q2 is conducted, meanwhile, the 7 th pin of the single chip microcomputer U1 outputs the high level, through the current limiting resistor R5, the light emitting diode in the optocoupler Q3 emits light, the collector and the emitter of the phototransistor in the optocoupler Q3 are conducted, because the load is a short circuit condition, the voltage between the output port P + and the output port P-is zero, the current passes through the resistor R7, the diode D1, the optocoupler Q3 and the optocoupler Q4, at the 6 th pin of the single chip microcomputer U1 detects the high level, and through logic analysis, the external load is considered to be a short circuit. The 4 th pin of the singlechip U1 does not output high level, so that the switch tube Q1 is in a cut-off state, and the battery can not discharge to the load.
The embodiment of the utility model provides an effective beneficial effect that brings is:
the utility model provides a pair of MOS pipe protection circuit for load short circuit detects, switch tube Q2 through series connection current limiting resistor R1 switches on earlier and detects, give back to control module effective signal at detection module, control module judges that the load is used for main discharging switch tube Q1 to switch on when not having the short circuit, switch tube Q1 has been guaranteed can not open under the outside load short circuit condition, avoid taking place the damage of main MOS pipe, damage hardware BMS, the incident that leads to the burning and the explosion of lithium cell even. In addition, implement the utility model has the advantages of with low costs, simple reliable and economic benefits are high.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes, modifications, equivalents and improvements can be made without departing from the spirit and scope of the invention.
Claims (7)
1. A MOS tube protection circuit for load short-circuit detection is characterized by comprising a control module (10), a detection module (20), a switch tube Q1, a switch tube Q2, a current-limiting resistor R1 and a switch SW, wherein the control module (10) is respectively connected with the detection module (20), a grid electrode of the switch tube Q1, a grid electrode of the switch tube Q2 and a 2 nd end of the switch SW, the detection module (20) is respectively connected with a battery anode B + and an output port P +, a drain electrode of the switch tube Q2 is connected with the detection module (20), a drain electrode of the switch tube Q1 and the output port P-through the current-limiting resistor R1, a source electrode of the switch tube Q1, a source electrode of the switch tube Q2 and a 1 st end of the switch SW are connected with a battery cathode B-;
the detection module (20) is used for short-circuit detection, the control module (10) is used for receiving a switching signal of the switch SW and a detection signal of the detection module (20), controlling the switching tube Q1 and the switching tube Q2, the switching tube Q1 and the switching tube Q2 are used for realizing on-off according to the control signal of the control module (10), the switching tube Q1 is used for on-off of main discharge, the switching tube Q2 is used for on-off of short-circuit detection discharge, the output port P + is used for connecting the positive pole of a load, and the output port P-is used for connecting the negative pole of the load.
2. The MOS tube protection circuit for load short-circuit detection according to claim 1, wherein the detection module (20) comprises an optical coupler Q3 and an optical coupler Q4, a collector of the optical coupler Q3 is connected with the output port P + through a resistor R7, an emitter of the optical coupler Q3 is connected with an anode of the optical coupler Q4, a cathode of the optical coupler Q3 is grounded, an anode of the optical coupler Q3 is connected with the control module (10) through a current limiting resistor R5, a cathode of the optical coupler Q4 is connected with a drain of a switch tube Q2 through a current limiting resistor R1, an emitter of the optical coupler Q4 is grounded, a collector of the optical coupler Q4 is connected with the control module (10), and a negative pole of a battery is grounded.
3. The MOS tube protection circuit for load short-circuit detection of claim 2, wherein the control module (10) comprises a single chip microcomputer U1, a pin 1 of the single chip microcomputer U1 is a power supply terminal, pins 3 and 6 of the single chip microcomputer U1 are used for detecting a level state, pins 4, 5 and 7 of the single chip microcomputer U1 are used for outputting a high level and a low level, and a pin 8 of the single chip microcomputer U1 is a ground terminal;
the 3 rd pin or the 6 th pin of the singlechip U1 is selected to be connected with the 2 nd end of the switch SW, the 3 rd pin or the 6 th pin of the singlechip U1 is selected to be connected with the collector of the optocoupler Q4, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is selected to be connected with the grid of the switch tube Q1 through the current-limiting resistor R2, the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is selected to be connected with the grid of the switch tube Q2 through the current-limiting resistor R3, and the 4 th pin, the 5 th pin or the 7 th pin of the singlechip U1 is selected to be connected with the anode of the optocoupler Q3 through the current-limiting resistor R5.
4. The MOS tube protection circuit for load short-circuit detection as claimed in claim 3, wherein a 3 rd pin of the single chip microcomputer U1 is connected with a 2 nd end of the switch SW, a 6 th pin of the single chip microcomputer U1 is connected with a collector of the optical coupler Q4, a 4 th pin of the single chip microcomputer U1 is connected with a gate of the switch tube Q1 through a current limiting resistor R2, a 5 th pin of the single chip microcomputer U1 is connected with a gate of the switch tube Q2 through a current limiting resistor R3, and a 7 th pin of the single chip microcomputer U1 is connected with an anode of the optical coupler Q3 through the current limiting resistor R5.
5. The MOS tube protection circuit for load short-circuit detection as claimed in claim 3 or 4, wherein the pin 3 of the single chip microcomputer U1 is connected with the power supply VCC through a pull-up resistor R4, and the pin 6 of the single chip microcomputer U1 is connected with the power supply VCC through a pull-up resistor R6.
6. The MOS tube protection circuit for load short-circuit detection as claimed in claim 2, 3 or 4, wherein a diode D1 is further connected between the emitter of the optical coupler Q3 and the resistor R7, the cathode of the diode D1 is connected with the emitter of the optical coupler Q3, and the anode of the diode D1 is connected with the resistor R7.
7. The MOS transistor protection circuit for load short-circuit detection as claimed in claim 1, wherein the switching transistor Q1 and the switching transistor Q2 are NMOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120322603.9U CN214314566U (en) | 2021-02-04 | 2021-02-04 | MOS (metal oxide semiconductor) tube protection circuit for load short-circuit detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120322603.9U CN214314566U (en) | 2021-02-04 | 2021-02-04 | MOS (metal oxide semiconductor) tube protection circuit for load short-circuit detection |
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| CN214314566U true CN214314566U (en) | 2021-09-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115116206A (en) * | 2022-07-27 | 2022-09-27 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS (metal oxide semiconductor) tubes |
| CN116327589A (en) * | 2023-05-25 | 2023-06-27 | 无锡佳健医疗器械股份有限公司 | Electronic acupuncture therapeutic instrument with output short circuit detection function and detection method |
-
2021
- 2021-02-04 CN CN202120322603.9U patent/CN214314566U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115116206A (en) * | 2022-07-27 | 2022-09-27 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS (metal oxide semiconductor) tubes |
| CN115116206B (en) * | 2022-07-27 | 2024-01-23 | 广达创芯电子技术(杭州)有限公司 | Load protection alarm circuit of double MOS tube |
| CN116327589A (en) * | 2023-05-25 | 2023-06-27 | 无锡佳健医疗器械股份有限公司 | Electronic acupuncture therapeutic instrument with output short circuit detection function and detection method |
| CN116327589B (en) * | 2023-05-25 | 2023-09-19 | 无锡佳健医疗器械股份有限公司 | Electronic acupuncture therapeutic instrument with output short circuit detection function and detection method |
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