CN215267612U - Protection circuit and medical equipment - Google Patents
Protection circuit and medical equipment Download PDFInfo
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- CN215267612U CN215267612U CN202121474318.5U CN202121474318U CN215267612U CN 215267612 U CN215267612 U CN 215267612U CN 202121474318 U CN202121474318 U CN 202121474318U CN 215267612 U CN215267612 U CN 215267612U
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Abstract
The application discloses a protection circuit and medical equipment, wherein the protection circuit comprises a load, a signal trigger unit, a locking protection unit and a first switch tube; the signal trigger unit is respectively connected with the load and the locking protection unit, and the first switch tube is respectively connected with the locking protection unit and the load; the signal trigger unit is used for generating a first control signal when the voltage of the signal trigger unit is greater than or equal to a first threshold voltage, and the locking protection unit is used for controlling the first switch tube to be disconnected based on the first control signal so that the power module stops supplying power to the load. According to the scheme, the novel protection circuit which can be used for cutting off power supply when the circuit is overloaded and storing the power-off state is provided.
Description
Technical Field
The application relates to the technical field of circuit protection, in particular to a protection circuit and medical equipment.
Background
Loads such as desktop computer hosts, televisions, refrigerators, notebook computers, etc. typically have power adapters. As is well known, a power adapter plugs a 220V ac voltage and converts the 220V ac voltage to a 12V or 24V dc voltage for supplying power to a load. However, when the circuit fails and an overvoltage is output, the overvoltage may damage electronic components (such as a step-down IC, a capacitor, a magnetic bead, etc.) in the load.
However, the current chip circuit internal protection mechanism is too slow in response, and the problem that the chip is burned out due to load short circuit easily occurs.
SUMMERY OF THE UTILITY MODEL
The application provides at least a protection circuit and a medical device.
The first aspect of the application provides a protection circuit, which comprises a load, a signal trigger unit, a locking protection unit and a first switch tube;
the signal trigger unit is respectively connected with the load and the locking protection unit, and the first switch tube is respectively connected with the locking protection unit and the load;
the locking protection unit is used for controlling the first switch tube to be disconnected based on the first control signal so that the power module stops supplying power to the load.
In some embodiments, the protection circuit further comprises a dc power source connected between the first switching tube and the load for providing a voltage to the load.
In some embodiments, the signal triggering unit includes a first resistor, a first end of the first resistor is connected to the load and the latch protection unit, respectively, a second end of the first resistor is grounded, and the signal triggering unit is configured to output a current triggering signal.
In some embodiments, the signal trigger unit includes a second resistor and a second switching tube, a first end of the second resistor is connected to the load and a control end of the second switching tube, a second end of the second resistor is connected to an input end of the second switching tube, an output end of the second switching tube is connected to the locking protection unit, and the signal trigger unit is configured to output a voltage trigger signal.
In some embodiments, the locking protection unit comprises a third switching tube, a fourth switching tube and a fifth switching tube, wherein a control end of the third switching tube is connected with an output end of the second switching tube and an output end of the fourth switching tube, an output end of the third switching tube is grounded, an input end of the third switching tube is connected with a control end of the fourth switching tube and a control end of the fifth switching tube, an input end of the fourth switching tube is connected with an input end of the fifth switching tube and a power supply input end, and an output end of the fifth switching tube is connected with a control end of the first switching tube;
and the fifth switching tube is a fifth PNP triode.
In some embodiments, the protection circuit further includes a sixth resistor, a first end of the sixth resistor is connected to the control end of the third switching tube, a second end of the sixth resistor is connected to the output end of the fourth switching tube, and the sixth resistor is used for protecting the third switching tube and the fourth switching tube.
In some embodiments, the locking protection unit comprises a third switching tube, a fourth switching tube and a fifth switching tube, wherein a control end of the third switching tube is connected with an output end of the second switching tube and an output end of the fourth switching tube, an output end of the third switching tube is grounded, and an input end of the third switching tube is connected with a control end of the fourth switching tube and a control end of the fifth switching tube; the input end of the fourth switching tube is connected with the input end of the fifth switching tube and the power supply input end, and the input end of the fifth switching tube is connected with the control end of the first switching tube;
the fifth switching tube is a fifth NPN triode.
In some embodiments, the protection circuit further includes a sixth resistor and a seventh resistor, a first end of the sixth resistor is connected to the input end of the fourth switching tube, a second end of the sixth resistor is connected to the output end of the first switching tube, and the sixth resistor is used for protecting the third switching tube and the fourth switching tube;
the first end of the seventh resistor is connected with the control end of the fourth switching tube and the control end of the fifth switching tube, the second end of the seventh resistor is connected with the second end of the sixth resistor and the output end of the first switching tube, and the seventh resistor is used for limiting the current of the fifth switching tube.
In some embodiments, a third resistor is disposed between the signal triggering unit and the control end of the third switching tube, and is used for protecting the third switching tube.
A second aspect of the application provides a medical device comprising a protection circuit as described above.
According to the scheme, the protection circuit comprises a load, a signal trigger unit, a locking protection unit and a first switch tube; the signal trigger unit is respectively connected with the load and the locking protection unit, and the first switch tube is respectively connected with the locking protection unit and the load; the signal trigger unit is used for generating a first control signal when the voltage of the signal trigger unit is greater than or equal to a first threshold voltage, and the locking protection unit is used for controlling the first switch tube to be disconnected based on the first control signal so that the power module stops supplying power to the load. According to the scheme, the novel protection circuit which can be used for cutting off power supply when the circuit is overloaded and storing the power-off state is provided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a first embodiment of a protection circuit provided in the present application;
fig. 2 is a schematic structural diagram of a second embodiment of the protection circuit provided in the present application;
fig. 3 is a schematic structural diagram of a third embodiment of the protection circuit provided in the present application;
fig. 4 is a schematic structural diagram of a fourth embodiment of the protection circuit provided in the present application;
fig. 5 is a schematic structural diagram of a fifth embodiment of the protection circuit provided in the present application;
fig. 6 is a schematic structural diagram of a sixth embodiment of the protection circuit provided in the present application;
fig. 7 is a schematic structural diagram of a seventh embodiment of the protection circuit provided in the present application;
fig. 8 is a schematic structural diagram of an eighth embodiment of the protection circuit provided in the present application;
fig. 9 is a schematic structural diagram of a ninth embodiment of a protection circuit provided in the present application
FIG. 10 is a schematic structural diagram of an embodiment of a medical device provided herein.
Detailed Description
The following describes in detail the embodiments of the present application with reference to the drawings attached hereto.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present application.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. Further, the term "plurality" herein means two or more than two. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a protection circuit according to a first embodiment of the present disclosure.
The protection circuit 100 of the disclosed embodiment includes at least the following components: the load 11, the signal trigger unit 12, the lock protection unit 13 and the first switching tube Q1.
The signal trigger unit 12 is respectively connected with the load 11 and the locking protection unit 13, and the first switch tube Q1 is respectively connected with the locking protection unit 13 and the load 11; the signal trigger unit 12 is configured to generate a first control signal when the voltage of the signal trigger unit 12 is greater than or equal to a first threshold voltage, and the lock protection unit 13 is configured to control the first switch tube Q1 to be turned off based on the first control signal, so that the power module stops supplying power to the load 11.
The load 11 in the embodiment of the present application may be a resistor, a power-consuming element such as an engine and a bulb, or may be a power supply terminal of another circuit, such as an open-circuit output of a chip circuit.
Specifically, the signal trigger unit 12 may include a first resistor R1. The first end of the first resistor R1 is connected to the load 11 and the latch protection unit 13, respectively, the second end of the first resistor R1 is grounded, and the signal trigger unit 12 is configured to output a current trigger signal.
The locking protection unit 13 comprises a third switching tube Q3, a fourth switching tube Q4 and a fifth switching tube Q5, wherein the control end of the third switching tube Q3 is connected with a first resistor R1, the output end of the third switching tube Q3 is grounded, the input end of the third switching tube Q3 is connected with the control end of the fourth switching tube Q4 and the control end of the fifth switching tube Q5, the input end of the fourth switching tube Q4 is connected with the input end and the power supply input end of the fifth switching tube Q5, and the output end of the fifth switching tube Q5 is connected with the control end of the first switching tube Q1.
It should be noted that the switching tube in the embodiment of the present application may be a transistor, a MOS tube, or another circuit apparatus having a switching function, which is not listed here. The control end of the switch tube in the embodiment of the application can be the base of the triode or the grid of the MOS tube, the input end of the switch tube is the current input end, and the output end of the switch tube is the current output end.
A third resistor R3 is disposed between the signal trigger unit 12 and the third switching tube Q3, and is used for protecting the third switching tube Q3. The protection circuit 100 further includes a sixth resistor R6, a first end of the sixth resistor R6 is connected to the control end of the third switching tube Q3, a second end of the sixth resistor R6 is connected to the output end of the fourth switching tube Q4, and the sixth resistor R6 is used for protecting the third switching tube Q3 and the fourth switching tube Q4.
The fifth switching tube Q5 in the embodiment of the present application is a fifth PNP triode.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the protection circuit provided in the present application.
In the protection circuit of fig. 2: a first end of the load 11 is connected with the first resistor R1 and the third resistor R3, and a second end of the load 11 is connected with the power output terminal VOUT and the input terminal of the first switching tube Q1; the output end of the first switching tube Q1 is connected with the power supply input end VIN, the input end of the fifth switching tube Q5 and the input end of the fourth switching tube Q4, and the control end of the first switching tube Q1 is connected with the output ends of the fourth resistor R4 and the fifth switching tube Q5; the control end of the fifth switching tube Q5 is connected with the control end of the fourth switching tube Q4 and the input end of the third switching tube Q3, and the output end of the fourth switching tube Q4 is connected with the control end of the third switching tube Q3.
The functional principle of the protection circuit in fig. 2 is as follows: before the protection circuit 100 is powered on, the resistance value of the first resistor R1 is set, R1 ═ UDProtection current, voltage U at point DDGenerally, 0.5-0.7V is used.
During the operation of the protection circuit 100, because of UD< 0.7V, so UCWhen the voltage is less than 0.7V, the third switching tube Q3 is cut off; then U isAAnd is high, the fourth switching transistor Q4 and the fifth PNP transistor Q5 do not satisfy the turn-on condition and are turned off. Because of UBThe voltage level is low, so the first switch Q1 is turned on, and the protection circuit 100 operates normally. When the load isWhen a short-circuit fault occurs in the resistor 11, the current flowing through the first resistor R1 becomes large so that U is turned onDGradually reaches 0.7V, then UCAlso 0.7V, the third switch tube Q3 is conducted, and U is pulled downA. Lower UAThe fifth PNP triode Q5 and the fourth switching tube Q4 are conducted, and the fifth PNP triode Q5 makes UBThe rising voltage causes the first switch Q1 to turn off, and the power supply to the load 11 is stopped. The fourth switching tube Q4 enables UCThe rising voltage causes the third transistor Q3 to be locked and conducted, and the third transistor Q3 in turn locks the fifth PNP transistor Q5 and the fourth transistor Q4 to be conducted. The whole protection circuit 100 completes the overcurrent protection locking function, after the short-circuit fault of the load 11 is removed, the protection circuit 100 is electrified again, and the protection circuit 100 is started to work under normal load.
The preset threshold voltage is determined according to the type of the transistor used by the protection circuit 100, and for some transistors, the preset threshold voltage may be set to 0.5V.
Further, the protection circuit 100 of the embodiment of the present application further includes a direct current power source, i.e., a DC-DC power source, connected between the first switching tube Q1 and the load 11, for providing a voltage to the load 11.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a protection circuit according to a third embodiment of the present disclosure.
Compared to the protection circuit 100 of fig. 2, the protection circuit 100 of fig. 3 adds a DC-DC power supply for supplying a proper voltage to the load 11. The specific working principle of the third embodiment of the protection circuit shown in fig. 3 is basically the same as that of the second embodiment of the protection circuit shown in fig. 2, and is not described herein again.
In other embodiments, the signal trigger unit 12 includes a second resistor R2 and a second switch Q2, a first end of the second resistor R2 is connected to the load 11 and a control end of the second switch Q2, a second end of the second resistor R2 is connected to an input end of the second switch Q2, an output end of the second switch Q2 is connected to the latch protection unit 13, and the signal trigger unit 12 is configured to output a voltage trigger signal.
As shown in fig. 4, fig. 4 is a schematic structural diagram of a fourth embodiment of the protection circuit provided in the present application. Compared with the protection circuit 100 of fig. 2, the protection circuit of fig. 4 changes the position of the sampling resistor, i.e., the first resistor R1, and adds the second switch Q2, the second switch Q2 is used to convert the set current trigger signal into the voltage trigger signal. The specific working principle of the fourth embodiment of the protection circuit shown in fig. 4 is basically the same as that of the second embodiment of the protection circuit shown in fig. 2, and is not described herein again.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a fifth embodiment of the protection circuit provided in the present application. Compared to the protection circuit 100 of fig. 4, the protection circuit 100 of fig. 5 adds a DC-DC power supply for supplying a proper voltage to the load 11. The specific working principle of the fifth embodiment of the protection circuit shown in fig. 5 is basically the same as that of the fourth embodiment of the protection circuit shown in fig. 4, and is not described herein again.
The locking protection unit 13 in the embodiment of the present application may further include a third switching tube Q3, a fourth switching tube Q4, and a fifth switching tube Q5, a control end of the third switching tube Q3 is connected to the first resistor R1, an output end of the third switching tube Q3 is grounded, an input end of the third switching tube Q3 is connected to a control end of the fourth switching tube Q4 and a control end of the fifth switching tube Q5, an input end of the fourth switching tube Q4 is connected to an input end and a power input end of the fifth switching tube Q5, and an input end of the fifth switching tube Q5 is connected to the control end of the first switching tube Q1.
The fifth switching transistor Q5 in the embodiment of the present application is a fifth NPN triode Q5.
The protection circuit 100 further includes a sixth resistor R6 and a seventh resistor R7, a first end of the sixth resistor R6 is connected to an input end of the fourth switching tube Q4, a second end of the sixth resistor R6 is connected to an output end of the first switching tube Q1, and the sixth resistor R6 is used to protect the third switching tube Q3 and the fourth switching tube Q4;
a first end of the seventh resistor R7 is connected to the control end of the fourth switching tube Q4 and the control end of the fifth switching tube Q5, a second end of the seventh resistor R7 is connected to the second end of the sixth resistor R6 and the output end of the first switching tube Q1, and the seventh resistor R7 is used for limiting the current of the fifth switching tube Q5. Further, the seventh resistor R7 turns off the fourth switching tube Q4, if the seventh resistor R7 does not exist, the fourth switching tube Q4 is directly turned on, the third switching tube Q3 is turned on, the fifth NPN triode Q5 is turned off, and the seventh resistor R7 can raise the voltage at the point a, so that the voltage at the point a can be controlled; the fourth resistor R4 and the seventh resistor R7 are functionally close to each other, so that the first switch Q1 is turned off.
As shown in fig. 6, fig. 6 is a schematic structural diagram of a sixth embodiment of the protection circuit provided in the present application.
In the protection circuit of fig. 6: a first end of the load 11 is connected with the first resistor R1 and the third resistor R3, and a second end of the load 11 is connected with an input end of the first switch tube Q1 and the power output end VOUT; the output end of the first switching tube Q1 is connected with the power supply input end VIN and the input end of the fourth switching tube Q4, and the control end of the first switching tube Q1 is connected with the input end of the fifth switching tube Q5; the control end of the fifth switching tube Q5 is connected with the control end of the fourth switching tube Q4 and the input end of the third switching tube Q3, and the output end of the fifth switching tube Q5 is grounded; the output end of the fourth switching tube Q4 is connected to the control end of the third switching tube Q3, and the output end of the third switching tube Q3 is grounded.
The functional principle of the protection circuit in fig. 6 is as follows: before the protection circuit 100 is powered on, the resistance value of the first resistor R1 is set, R1 ═ UDProtection current, voltage U at point DDGenerally, 0.5-0.7V is used.
During the operation of the protection circuit 100, because of UD< 0.7V, so UCWhen the voltage is less than 0.7V, the third switching tube Q3 is cut off; then U isAIs high, the fourth switch Q4 is off, the fifth NPN transistor Q5 is on, and the fifth NPN transistor Q5 causes U to go highBAnd is pulled low, the first switching tube Q1 is turned on, and the protection circuit 100 works normally. When the load 11 has a short-circuit fault, the current flowing through the first resistor R1 becomes large so that U becomes largeDGradually reaches 0.7V, then UCAlso 0.7V, the third switch tube Q3 is conducted, and U is pulled downA. Lower UAThe fifth NPN triode Q5 is cut off, and the fifth NPN triode Q5 is UBThe rising voltage causes the first switch Q1 to turn off, and the power supply to the load 11 is stopped. At the same time, UAThe fourth switch tube Q4 is conducted, and the fourth switch tube Q4 makes UCRising to lock the third switch tube Q3And when the third transistor Q3 is turned on, the fifth NPN triode Q5 is locked to be turned off and the fourth transistor Q4 is turned on. The whole protection circuit 100 completes the overcurrent protection locking function, after the short-circuit fault of the load 11 is removed, the protection circuit 100 is electrified again, and the protection circuit 100 is started to work under normal load.
The preset threshold voltage is determined according to the type of the transistor used by the protection circuit 100, and for some transistors, the preset threshold voltage may be set to 0.5V.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a seventh embodiment of the protection circuit provided in the present application.
Compared to the protection circuit 100 of fig. 6, the protection circuit 100 of fig. 7 adds a DC-DC power supply for supplying a proper voltage to the load 11. The specific working principle of the seventh embodiment of the protection circuit shown in fig. 7 is basically the same as that of the sixth embodiment of the protection circuit shown in fig. 6, and is not described herein again.
As shown in fig. 8, fig. 8 is a schematic structural diagram of an eighth embodiment of the protection circuit provided in the present application. Compared with the protection circuit 100 of fig. 6, the protection circuit of fig. 6 changes the position of the sampling resistor, i.e., the first resistor R1, and adds the second switch Q2, the second switch Q2 is used to convert the set current trigger signal into the voltage trigger signal. The specific operating principle of the eighth embodiment of the protection circuit shown in fig. 8 is basically the same as that of the sixth embodiment of the protection circuit shown in fig. 6, and is not described herein again.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a ninth embodiment of the protection circuit provided in the present application.
Compared to the protection circuit 100 of fig. 8, the protection circuit 100 of fig. 9 adds a DC-DC power supply for supplying a proper voltage to the load 11. The specific working principle of the ninth embodiment of the protection circuit shown in fig. 9 is basically the same as that of the eighth embodiment of the protection circuit shown in fig. 8, and is not described herein again.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a medical apparatus provided in the present application. The medical device 200 according to the embodiment of the present application at least includes the protection circuit 21 described in any one of fig. 1 to 9, and details of the protection circuit 21 are not described herein again.
The foregoing description of the various embodiments is intended to highlight various differences between the embodiments, and the same or similar parts may be referred to each other, and for brevity, will not be described again herein.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a module or a unit is merely one type of logical division, and an actual implementation may have another division, for example, a unit or a component may be combined or integrated with another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some interfaces, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
Claims (10)
1. The protection circuit is characterized by comprising a load, a signal trigger unit, a locking protection unit and a first switch tube;
the signal trigger unit is respectively connected with the load and the locking protection unit, and the first switch tube is respectively connected with the locking protection unit and the load;
the locking protection unit is used for controlling the first switch tube to be disconnected based on the first control signal so that the power module stops supplying power to the load.
2. The protection circuit of claim 1,
the protection circuit further comprises a direct current power supply, wherein the direct current power supply is connected between the first switching tube and the load and used for providing voltage for the load.
3. The protection circuit of claim 1,
the signal trigger unit comprises a first resistor, the first end of the first resistor is respectively connected with the load and the locking protection unit, the second end of the first resistor is grounded, and the signal trigger unit is used for outputting a current trigger signal.
4. The protection circuit of claim 1,
the signal trigger unit comprises a second resistor and a second switch tube, the first end of the second resistor is connected with the load and the control end of the second switch tube respectively, the second end of the second resistor is connected with the input end of the second switch tube, the output end of the second switch tube is connected with the locking protection unit, and the signal trigger unit is used for outputting a voltage trigger signal.
5. The protection circuit of claim 4,
the locking protection unit comprises a third switching tube, a fourth switching tube and a fifth switching tube, wherein the control end of the third switching tube is connected with the output end of the second switching tube and the output end of the fourth switching tube, the output end of the third switching tube is grounded, the input end of the third switching tube is connected with the control end of the fourth switching tube and the control end of the fifth switching tube, the input end of the fourth switching tube is connected with the input end and the power supply input end of the fifth switching tube, and the output end of the fifth switching tube is connected with the control end of the first switching tube;
and the fifth switching tube is a fifth PNP triode.
6. The protection circuit of claim 5,
the protection circuit further comprises a sixth resistor, the first end of the sixth resistor is connected with the control end of the third switch tube, the second end of the sixth resistor is connected with the output end of the fourth switch tube, and the sixth resistor is used for protecting the third switch tube and the fourth switch tube.
7. The protection circuit of claim 4,
the locking protection unit comprises a third switching tube, a fourth switching tube and a fifth switching tube, wherein the control end of the third switching tube is connected with the output end of the second switching tube and the output end of the fourth switching tube, the output end of the third switching tube is grounded, and the input end of the third switching tube is connected with the control end of the fourth switching tube and the control end of the fifth switching tube; the input end of the fourth switching tube is connected with the input end of the fifth switching tube and the power supply input end, and the input end of the fifth switching tube is connected with the control end of the first switching tube;
the fifth switching tube is a fifth NPN triode.
8. The protection circuit of claim 7,
the protection circuit further comprises a sixth resistor and a seventh resistor, wherein the first end of the sixth resistor is connected with the input end of the fourth switching tube, the second end of the sixth resistor is connected with the output end of the first switching tube, and the sixth resistor is used for protecting the third switching tube and the fourth switching tube;
the first end of the seventh resistor is connected with the control end of the fourth switching tube and the control end of the fifth switching tube, the second end of the seventh resistor is connected with the second end of the sixth resistor and the output end of the first switching tube, and the seventh resistor is used for limiting the current of the fifth switching tube.
9. The protection circuit according to claim 5 or 7,
and a third resistor is arranged between the signal trigger unit and the control end of the third switching tube and used for protecting the third switching tube.
10. A medical device, characterized in that it comprises a protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474318.5U CN215267612U (en) | 2021-06-30 | 2021-06-30 | Protection circuit and medical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474318.5U CN215267612U (en) | 2021-06-30 | 2021-06-30 | Protection circuit and medical equipment |
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| CN215267612U true CN215267612U (en) | 2021-12-21 |
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| CN202121474318.5U Active CN215267612U (en) | 2021-06-30 | 2021-06-30 | Protection circuit and medical equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116627205A (en) * | 2022-02-10 | 2023-08-22 | 比亚迪股份有限公司 | Follower circuit, vehicle power supply circuit and vehicle |
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2021
- 2021-06-30 CN CN202121474318.5U patent/CN215267612U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116627205A (en) * | 2022-02-10 | 2023-08-22 | 比亚迪股份有限公司 | Follower circuit, vehicle power supply circuit and vehicle |
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