Negative pressure impact resistant power supply output circuit and negative pressure impact resistant power supply output device

Abstract

The utility model discloses a negative-voltage-impact-resistant power output circuit and device, and relates to the technical field of power supplies, and the negative-voltage-impact-resistant power output circuit comprises an input circuit which is connected with an input interface and is used for accessing an input current of the input interface; the constant current module is connected with the input circuit, the constant current module is used for carrying out constant current on the input current to obtain a constant current, the constant current module comprises a constant current circuit and an anti-negative-pressure-impact protection circuit, and the anti-negative-pressure-impact protection circuit is connected with the constant current circuit; the anti-negative-pressure-impact protection circuit is used for carrying out anti-negative-pressure-impact protection on the constant-current circuit when the constant-current circuit carries out constant current on the input current to obtain constant current; and the optocoupler output circuit is connected with the constant current module, the optocoupler output circuit is connected with the output interface, and the optocoupler output circuit is used for outputting the constant current to the output interface. According to the invention, the negative pressure impact resistance of the power supply output circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply output circuit and device that is resistant to negative pressure shock. Background Art

[0002] With the development of output power supplies, users have also put forward higher requirements for output power circuits.

[0003] The traditional power supply output circuit directly outputs the current after constant current processing through the triode in the constant current circuit. Since the base and emitter of the triode that plays a constant current role have no protection measures, a reverse voltage of about 6V can break through the PN junction between the base and the emitter, resulting in low negative voltage impact resistance of the power supply output circuit.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Utility Model Content

[0005] The main purpose of the present application is to provide a power output circuit and device that are resistant to negative pressure shocks, aiming to solve the technical problem that the power output circuit has low ability to resist negative pressure shocks.

[0006] To achieve the above object, the present application provides a power output circuit resistant to negative pressure shock, the power output circuit resistant to negative pressure shock comprising:

[0007] An input circuit, wherein an input end of the input circuit is connected to an input interface, and the input circuit is used to access an input current of the input interface;

[0008] A constant current module, wherein the input end of the constant current module is connected to the output end of the input circuit, and the constant current module is used to perform constant current on the input current to obtain a constant current, wherein the constant current module includes a constant current circuit and an anti-negative pressure impact protection circuit, and the anti-negative pressure impact protection circuit is connected to the constant current circuit, and the anti-negative pressure impact protection circuit is used to perform anti-negative pressure impact protection on the constant current circuit when the constant current circuit performs constant current on the input current to obtain a constant current;

[0009] An optocoupler output circuit, wherein the input end of the optocoupler output circuit is connected to the output end of the constant current module, the output end of the optocoupler output circuit is connected to the output interface, and the optocoupler output circuit is used to output the constant current to the output interface.

[0010] In one embodiment, the input interface includes a negative input terminal, and the constant current circuit includes:

[0011] a first resistor, wherein a first end of the first resistor is connected to the output end of the input circuit and the input end of the optocoupler output circuit, and a second end of the first resistor is connected to the negative input end;

[0012] a second resistor, a first end of the second resistor being connected to a first end of the first resistor;

[0013] a first triode, wherein a first end of the first triode is connected to a second end of the second resistor, and a second end of the first triode is connected to a second end of the first resistor;

[0014] a second triode, wherein a first end of the second triode is connected to an input end of the optical coupling output circuit, a second end of the second triode is connected to a third end of the first triode, and a third end of the second triode is connected to a second end of the second resistor;

[0015] a third resistor, wherein a first end of the third resistor is connected to the second end of the first transistor, and a second end of the third resistor is connected to the third end of the first transistor;

[0016] A fourth resistor, wherein a first end of the fourth resistor is connected to the third end of the first transistor, and a second end of the fourth resistor is connected to the first end of the second transistor.

[0017] In one embodiment, the anti-negative pressure shock protection circuit includes:

[0018] a first diode, wherein a cathode of the first diode is connected to the third end of the second transistor, and an anode of the first diode is connected to the third end of the first transistor;

[0019] A second diode, wherein a cathode of the second diode is connected to the third end of the first transistor, and an anode of the second diode is connected to the second end of the first transistor.

[0020] In one embodiment, the input interface includes a positive input terminal, and the input circuit includes:

[0021] a third diode, wherein an anode of the third diode is connected to the positive input terminal;

[0022] A filter inductor, wherein a first end of the filter inductor is connected to the cathode of the third diode, and a second end of the filter inductor is connected to the first end of the first resistor.

[0023] In one embodiment, the optical coupling output circuit includes an optical coupling circuit and a filter circuit, the optical coupling circuit includes an optical coupler, and the optical coupler includes:

[0024] a first input terminal connected to a first end of the first resistor;

[0025] A second input terminal, the second input terminal is connected to the first terminal of the second transistor;

[0026] A first output terminal, wherein the first output terminal is connected to the filter circuit;

[0027] A second output terminal is grounded.

[0028] In one embodiment, the optocoupler circuit further includes:

[0029] A first light emitting diode, wherein an anode of the first light emitting diode is connected to a first end of the first resistor, and a cathode of the first light emitting diode is connected to the first input end.

[0030] In one embodiment, the optical coupler output circuit further includes:

[0031] A fifth resistor, wherein a first end of the fifth resistor is connected to a pull-up voltage, and a second end of the fifth resistor is connected to the first output end.

[0032] In one embodiment, the filtering circuit comprises:

[0033] a sixth resistor, wherein a first end of the sixth resistor is connected to a second end of the fifth resistor, and a second end of the sixth resistor is connected to the output interface;

[0034] A first capacitor, wherein a first end of the first capacitor is connected to a second end of the sixth resistor, and a second end of the first capacitor is grounded.

[0035] In one embodiment, the negative pressure shock resistant power output circuit further includes:

[0036] a second light emitting diode, wherein a cathode of the second light emitting diode is connected to the negative input terminal;

[0037] A seventh resistor, wherein a second end of the seventh resistor is connected to the anode of the second light-emitting diode, and a first end of the seventh resistor is connected to the output end of the input circuit.

[0038] In addition, to achieve the above-mentioned purpose, the present application also provides a power output device resistant to negative pressure shock, and the power output device resistant to negative pressure shock includes the above-mentioned power output circuit resistant to negative pressure shock.

[0039] The embodiment of the present application provides a power supply output circuit that is resistant to negative pressure shock, including an input circuit, the input end of the input circuit is connected to an input interface, and the input circuit is used to access the input current of the input interface; a constant current module, the input end of the constant current module is connected to the output end of the input circuit, and the constant current module is used to perform constant current on the input current to obtain a constant current, wherein the constant current module includes a constant current circuit and a negative pressure shock protection circuit, the negative pressure shock protection circuit is connected to the constant current circuit, and the negative pressure shock protection circuit is used to perform constant current on the input current in the constant current circuit to obtain a constant current When the current is generated, the constant current circuit is protected against negative pressure shock; an optocoupler output circuit, the input end of the optocoupler output circuit is connected to the output end of the constant current module, the output end of the optocoupler output circuit is connected to the output interface, and the optocoupler output circuit is used to output the constant current to the output interface. When the constant current circuit performs constant current on the input current to obtain the constant current, the constant current circuit is protected against negative pressure shock, thereby avoiding the phenomenon that the base and emitter of the triode that plays the constant current role have no protection measures, and the reverse voltage of about 6V can break through the PN junction between the base and the emitter. This power supply output circuit that resists negative pressure shocks uses the negative pressure shock protection circuit to protect the constant current circuit against negative pressure shocks when the constant current circuit performs constant current on the input current to obtain the constant current, thereby improving the ability of the power supply output circuit to resist negative pressure shocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the framework of the first embodiment of the power output circuit for resisting negative pressure shock of the present application;

[0041] Figure 2 A circuit diagram of an embodiment of a conventional power output circuit for resisting negative pressure shock;

[0042] Figure 3 A circuit diagram of another embodiment of an existing power output circuit that resists negative pressure shock;

[0043] Figure 4 A circuit diagram of a second embodiment of a power output circuit for resisting negative pressure shock of the present application;

[0044] Figure 5 This is a circuit diagram of a third embodiment of a power output circuit capable of resisting negative pressure shock in the present application.

[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0046] Description of Figure Numbers:

[0047] 100, input interface; 200, output interface; 10, input circuit; 20, constant current module; 21, constant current circuit; 22, anti-negative pressure impact protection circuit; 30, optocoupler output circuit; D1-D3, first diode-third diode; D4-D5, first light-emitting diode-second light-emitting diode; L1, filter inductor; Q1-Q2, first transistor-second transistor; U1, optocoupler; U11, first input terminal; U12, second input terminal; U13, first output terminal; U14, second output terminal; C1, first capacitor; VDD, pull-up voltage; PU-, negative input terminal; PU+, positive input terminal. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0050] With the use of output power supply, it is found that most of them will have port damage problems. After analyzing the port damage, it is found that the port is easily damaged when a peak negative pressure is applied to the port.

[0051] Therefore, based on the above-mentioned deficiencies of the power supply output circuit that is resistant to negative pressure shock, a power supply output circuit that is resistant to negative pressure shock of the present application is proposed. The main solution of the embodiment of the present application is: when the constant current circuit performs constant current on the input current to obtain a constant current through the negative pressure shock protection circuit, the constant current circuit is protected against negative pressure shock, thereby improving the ability of the power supply output circuit to resist negative pressure shock.

[0052] Based on this, the embodiment of the present application provides a power output circuit that resists negative pressure shock. Figure 1 , Figure 1 It is a schematic diagram of the framework of the first embodiment of the power output circuit for resisting negative pressure shock of the present application.

[0053] Reference Figure 1 The present application provides a power output circuit resistant to negative pressure shock, and the power output circuit resistant to negative pressure shock comprises:

[0054] An input circuit 10, wherein an input end of the input circuit 10 is connected to an input interface 100, and the input circuit 10 is used to access an input current of the input interface;

[0055] A constant current module 20, wherein the input end of the constant current module 20 is connected to the output end of the input circuit 10, and the constant current module 20 is used to perform constant current on the input current to obtain a constant current, wherein the constant current module 20 includes a constant current circuit 21 and an anti-negative pressure impact protection circuit 22, and the anti-negative pressure impact protection circuit 22 is connected to the constant current circuit 21, and the anti-negative pressure impact protection circuit 22 is used to perform anti-negative pressure impact protection on the constant current circuit 21 when the constant current circuit 21 performs constant current on the input current to obtain a constant current;

[0056] The optocoupler output circuit 30 has an input end connected to the output end of the constant current module, and an output end of the optocoupler output circuit 30 connected to the output interface 200 . The optocoupler output circuit 30 is used to output the constant current to the output interface 200 .

[0057] In this embodiment, the power output circuit can be a 5-24V power output circuit, which is connected to the input interface 100 through the input end of the input circuit 10, and then receives the input current of the input interface. At this time, the input current is constant-currented by the constant current module 20 to obtain a constant current, and finally the current after constant current is output to the output interface 200 through the optocoupler output circuit 30, thereby completing the output function of the power output circuit.

[0058] In one embodiment, in order to avoid damage to the transistors in the constant current module 20 due to the peak negative voltage, a negative pressure impact protection circuit 22 is designed in the constant current module 20, so that when the constant current circuit 21 performs constant current on the input current to obtain a constant current, the constant current circuit 21 is protected against negative pressure impact, thereby improving the negative pressure impact resistance of the power supply output circuit.

[0059] In this embodiment, the negative pressure shock resistant power supply output circuit includes an input circuit, the input end of the input circuit is connected to the input interface, and the input circuit is used to access the input current of the input interface; a constant current module, the input end of the constant current module is connected to the output end of the input circuit, and the constant current module is used to perform constant current on the input current to obtain a constant current, wherein the constant current module includes a constant current circuit and a negative pressure shock resistant protection circuit, the negative pressure shock resistant protection circuit is connected to the constant current circuit, and the negative pressure shock resistant protection circuit is used to perform constant current on the input current in the constant current circuit to obtain a constant current When the constant current circuit is protected against negative pressure shock; the optocoupler output circuit, the input end of the optocoupler output circuit is connected to the output end of the constant current module, the output end of the optocoupler output circuit is connected to the output interface, the optocoupler output circuit is used to output the constant current to the output interface, and the constant current circuit is protected against negative pressure shock when the constant current circuit performs constant current on the input current to obtain the constant current through the negative pressure shock protection circuit, thereby avoiding the phenomenon that the base and emitter of the triode that plays the constant current role have no protection measures, and the reverse voltage of about 6V can break through the PN junction between the base and the emitter. This power supply output circuit that resists negative pressure shocks protects the constant current circuit against negative pressure shocks when the constant current circuit performs constant current on the input current to obtain the constant current through the negative pressure shock protection circuit, thereby improving the power supply output circuit's ability to resist negative pressure shocks.

[0060] Further, based on the above-mentioned first embodiment of the present application, a second embodiment of the power output circuit for resisting negative pressure shock of the present application is proposed, referring to Figure 4 , Figure 4 This is a circuit diagram of a second embodiment of a power output circuit for resisting negative pressure shock of the present application. The input interface 100 includes a negative input terminal PU-, and the constant current circuit 21 includes:

[0061] a first resistor R1, wherein a first end of the first resistor R1 is connected to the output end of the input circuit 10 and the input end of the optocoupler output circuit 30, and a second end of the first resistor R1 is connected to the negative input end PU-;

[0062] a second resistor R2, wherein a first end of the second resistor R2 is connected to a first end of the first resistor R1;

[0063] A first transistor Q1, wherein a first end of the first transistor Q1 is connected to a second end of the second resistor R2, and a second end of the first transistor Q1 is connected to a second end of the first resistor R1;

[0064] A second transistor Q2, wherein a first end of the second transistor Q2 is connected to the input end of the optical coupling output circuit 30, a second end of the second transistor Q2 is connected to the third end of the first transistor Q1, and a third end of the second transistor Q2 is connected to the second end of the second resistor R2;

[0065] a third resistor R3, wherein a first end of the third resistor R3 is connected to the second end of the first transistor Q1, and a second end of the third resistor R3 is connected to the third end of the first transistor Q1;

[0066] A fourth resistor R4, wherein a first end of the fourth resistor R4 is connected to the third end of the first transistor Q1, and a second end of the fourth resistor R4 is connected to a first end of the second transistor Q2:

[0067] In this embodiment, the power output circuit takes a 5-12V power supply circuit as an example (it can also be other types of power supply circuits, as long as the circuit needs to resist negative voltage impact on the transistor). Figure 2 , Figure 2 This is a circuit diagram of an embodiment of an existing power output circuit that resists negative pressure shock. The first resistor R1 is used for charge release. The first transistor Q1, the second transistor Q2, the third resistor R3 and the second resistor R2 perform constant current on the input circuit to obtain a constant current, thereby limiting the current flowing through the diode in the optical coupler U1 to achieve constant current output. The fourth resistor R4 is used to shunt the current of the second transistor Q2 to reduce the heat generation of the second transistor Q2. For further reference, Figure 3 , Figure 3 This is a circuit diagram of another embodiment of an existing power output circuit that resists negative pressure shock. A diode is added to the figure to clearly show the working state of the power output circuit.

[0068] In one embodiment, compared Figure 2 and Figure 3 , Figure 4 The difference lies in that a first diode D1 and a second diode D2 are added, and then the transistor is protected against negative voltage shock by the first diode D1 and the second diode D2.

[0069] In one embodiment, the anti-negative pressure shock protection circuit 22 includes:

[0070] a first diode D1, wherein a cathode of the first diode D1 is connected to the third end of the second transistor Q2, and an anode of the first diode D1 is connected to the third end of the first transistor Q1;

[0071] A second diode D2, wherein a cathode of the second diode D2 is connected to the third end of the first transistor Q1, and an anode of the second diode D2 is connected to the second end of the first transistor Q1.

[0072] In this embodiment, the first diode D1 is connected to the base and emitter of the second transistor Q2, and the second diode D2 is connected to the base and emitter of the first transistor Q1, thereby better protecting the PN junctions of the second transistor Q2 and the base and emitter of the first transistor Q1 from excessive negative voltage shock. Thus, the first diode D1 clamps the negative voltage of the PN junction of the base and emitter of the second transistor Q2, which is not easy to be broken down and damaged; the second diode D2 clamps the negative voltage of the PN junction of the base and emitter of the first transistor Q1, which is not easy to be broken down and damaged. This ensures that the power output circuit will not be easily damaged when a peak negative voltage is applied to the port, thereby improving the ability of the power output circuit to resist negative voltage shock.

[0073] Further, based on the first embodiment and / or the second embodiment of the present application, a third embodiment of the power output circuit for resisting negative pressure shock of the present application is proposed, wherein the input interface 100 includes a positive input terminal PU+, and the input circuit 10 includes:

[0074] a third diode D3, wherein an anode of the third diode D3 is connected to the positive input terminal PU+;

[0075] A filter inductor L1, wherein a first end of the filter inductor L1 is connected to a cathode of the third diode D3, and a second end of the filter inductor L1 is connected to a first end of the first resistor R1.

[0076] In this embodiment, the input circuit 10 includes a third diode D3 and a filter inductor L1. The third diode D3 is used to prevent reverse connection, and the filter inductor L1 is used for high-frequency filtering. Other components can also be used to achieve different functions, which are not limited here.

[0077] In one embodiment, the optical coupling output circuit 30 includes an optical coupling circuit and a filter circuit. The optical coupling circuit includes an optical coupler U1. The optical coupler U1 includes:

[0078] A first input terminal U11, wherein the first input terminal U11 is connected to a first end of the first resistor R1;

[0079] A second input terminal U12, wherein the second input terminal U12 is connected to a first terminal of the second transistor Q2;

[0080] A first output terminal U13, wherein the first output terminal U13 is connected to the filter circuit;

[0081] The second output terminal U14 is grounded.

[0082] In this embodiment, the optical coupler U1 comprises a first input terminal U11, a second input terminal U12, a first output terminal U13 and a second output terminal U14, and can be an optical coupler U1 commonly used in a power supply circuit, such as Figure 4 The connection method of the internal light-emitting diode and transistor or triode.

[0083] In one embodiment, the optocoupler circuit further includes:

[0084] A first light emitting diode D4 , wherein an anode of the first light emitting diode D4 is connected to the first end of the first resistor R1 , and a cathode of the first light emitting diode D4 is connected to the first input end U11 .

[0085] In this embodiment, the first light-emitting diode D4 is used to indicate that the optical coupler U1 is working. For example, when the optical coupler U1 is working, the first light-emitting diode D4 lights up, and when the optical coupler U1 is not working, the first light-emitting diode D4 goes out. Thus, the working status of the optical coupler U1 can be understood in real time to perform targeted control.

[0086] In one embodiment, the optical coupler output circuit further includes:

[0087] A fifth resistor R5 , a first end of the fifth resistor R5 is connected to the pull-up voltage VDD, and a second end of the fifth resistor R5 is connected to the first output end U13 .

[0088] In this embodiment, the fifth resistor R5 is used for pull-up output, and the pull-up voltage VDD can be 5V voltage, and then the working condition of the secondary side of the optocoupler U1 can be guaranteed after being pulled up by the pull-up voltage VDD and the fifth resistor R5. Other pull-up voltages or other pull-up methods can also be used here, which are not limited here.

[0089] In one embodiment, the filtering circuit comprises:

[0090] a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected to a second end of the fifth resistor R5, and a second end of the sixth resistor R6 is connected to the output interface 200;

[0091] A first capacitor C1 , wherein a first end of the first capacitor C1 is connected to a second end of the sixth resistor R6 , and a second end of the first capacitor C1 is grounded.

[0092] In this embodiment, the filter circuit is used to filter the output current based on the sixth resistor R6 and the first capacitor C1, thereby ensuring the stability of the output current. At the same time, other types of filters or filter circuits can also be used here, which is not limited here.

[0093] Further, in one embodiment, referring to Figure 5, a circuit diagram of a third embodiment of a power output circuit resistant to negative pressure shock of the present application, wherein the power output circuit resistant to negative pressure shock further comprises:

[0094] A second light emitting diode D5, wherein a cathode of the second light emitting diode D5 is connected to the negative input terminal PU-;

[0095] A seventh resistor R7 , wherein a second end of the seventh resistor R7 is connected to the anode of the second light emitting diode D5 , and a first end of the seventh resistor R7 is connected to the output end of the input circuit 10 .

[0096] In this embodiment, the power output circuit resistant to negative pressure shock can also include an indication function, thereby controlling the second light-emitting diode D5 to emit light when input, wherein the seventh resistor R7 is used to prevent the second light-emitting diode D5 from surging, so that the power output circuit can be clearly understood to be working.

[0097] The present application also provides a power output device resistant to negative pressure shock, comprising the above-mentioned power output circuit resistant to negative pressure shock.

[0098] The power output device for resisting negative pressure shock provided by the present application can solve the technical problem of low reliability of the power output circuit for resisting negative pressure shock. Compared with the prior art, the beneficial effects of the power output device for resisting negative pressure shock provided by the present application are the same as the beneficial effects of the power output device for resisting negative pressure shock provided by the above embodiment, and will not be elaborated here.

[0099] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A power output circuit resistant to negative pressure shock, characterized in that: The negative pressure shock resistant power output circuit comprises: An input circuit, wherein an input end of the input circuit is connected to an input interface, and the input circuit is used to access an input current of the input interface; A constant current module, wherein the input end of the constant current module is connected to the output end of the input circuit, and the constant current module is used to perform constant current on the input current to obtain a constant current, wherein the constant current module includes a constant current circuit and an anti-negative pressure impact protection circuit, and the anti-negative pressure impact protection circuit is connected to the constant current circuit, and the anti-negative pressure impact protection circuit is used to perform anti-negative pressure impact protection on the constant current circuit when the constant current circuit performs constant current on the input current to obtain a constant current; An optocoupler output circuit, wherein the input end of the optocoupler output circuit is connected to the output end of the constant current module, the output end of the optocoupler output circuit is connected to the output interface, and the optocoupler output circuit is used to output the constant current to the output interface.

2. The negative pressure shock resistant power output circuit according to claim 1, characterized in that: The input interface includes a negative input terminal, and the constant current circuit includes: a first resistor, wherein a first end of the first resistor is connected to the output end of the input circuit and the input end of the optocoupler output circuit, and a second end of the first resistor is connected to the negative input end; a second resistor, a first end of the second resistor being connected to a first end of the first resistor; a first triode, wherein a first end of the first triode is connected to a second end of the second resistor, and a second end of the first triode is connected to a second end of the first resistor; a second triode, wherein a first end of the second triode is connected to an input end of the optical coupling output circuit, a second end of the second triode is connected to a third end of the first triode, and a third end of the second triode is connected to a second end of the second resistor; a third resistor, wherein a first end of the third resistor is connected to the second end of the first transistor, and a second end of the third resistor is connected to the third end of the first transistor; A fourth resistor, wherein a first end of the fourth resistor is connected to the third end of the first transistor, and a second end of the fourth resistor is connected to the first end of the second transistor.

3. The negative pressure shock resistant power output circuit according to claim 2, characterized in that: The anti-negative pressure impact protection circuit comprises: a first diode, wherein a cathode of the first diode is connected to the third end of the second transistor, and an anode of the first diode is connected to the third end of the first transistor; A second diode, wherein a cathode of the second diode is connected to the third end of the first transistor, and an anode of the second diode is connected to the second end of the first transistor.

4. The negative pressure shock resistant power output circuit according to claim 2, characterized in that: The input interface includes a positive input terminal, and the input circuit includes: a third diode, wherein an anode of the third diode is connected to the positive input terminal; A filter inductor, wherein a first end of the filter inductor is connected to the cathode of the third diode, and a second end of the filter inductor is connected to the first end of the first resistor.

5. The negative pressure shock resistant power output circuit according to claim 2, characterized in that: The optocoupler output circuit includes an optocoupler circuit and a filter circuit. The optocoupler circuit includes an optocoupler. The optocoupler includes: a first input terminal connected to a first end of the first resistor; A second input terminal, the second input terminal is connected to the first terminal of the second transistor; A first output terminal, wherein the first output terminal is connected to the filter circuit; A second output terminal is grounded.

6. The negative pressure shock resistant power output circuit according to claim 5, characterized in that: The optocoupler circuit further includes: A first light emitting diode, wherein an anode of the first light emitting diode is connected to a first end of the first resistor, and a cathode of the first light emitting diode is connected to the first input end.

7. The negative pressure shock resistant power output circuit according to claim 5, characterized in that: The optocoupler output circuit also includes: A fifth resistor, wherein a first end of the fifth resistor is connected to a pull-up voltage, and a second end of the fifth resistor is connected to the first output end.

8. The negative pressure shock resistant power output circuit according to claim 7, characterized in that: The filtering circuit comprises: a sixth resistor, wherein a first end of the sixth resistor is connected to a second end of the fifth resistor, and a second end of the sixth resistor is connected to the output interface; A first capacitor, wherein a first end of the first capacitor is connected to a second end of the sixth resistor, and a second end of the first capacitor is grounded.

9. The negative pressure shock resistant power output circuit according to claim 2, characterized in that: The negative pressure shock resistant power output circuit also includes: a second light emitting diode, wherein a cathode of the second light emitting diode is connected to the negative input terminal; A seventh resistor, wherein a second end of the seventh resistor is connected to the anode of the second light-emitting diode, and a first end of the seventh resistor is connected to the output end of the input circuit.

10. A power output device resistant to negative pressure shock, characterized in that: The negative pressure shock resistant power output device comprises the negative pressure shock resistant power output circuit according to any one of claims 1 to 9.

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