Output rapid turn-off circuit and power supply system

Abstract

The utility model discloses an output rapid turn-off circuit and a power supply system, and relates to the field of automation control, the disclosed circuit comprises an amplification circuit, an energy storage circuit, an acquisition circuit and a first one-way conduction circuit, the first one-way conduction circuit is connected with the amplification circuit and the acquisition circuit, the first one-way conduction circuit is connected with the energy storage circuit, and the energy storage circuit is connected with the acquisition circuit. When the acquisition circuit detects that a voltage signal acquired by the acquisition circuit is smaller than a preset reference voltage, a turn-off signal is sent to the first one-way conduction circuit, when the first one-way conduction circuit receives the turn-off signal, the connection between the amplification circuit and the energy storage circuit is cut off, and when the connection between the amplification circuit and the energy storage circuit is cut off, output is stopped. Compared with the prior art, the amplification circuit in the application quickly stops output through the unidirectional conduction of the first unidirectional conduction circuit when detecting that the voltage signal acquired by the acquisition circuit is smaller than the preset reference voltage, and the application occasion that the next level requires a faster falling edge is met.

Description

Technical Field

[0001] This application relates to the field of automation control, and in particular to an output fast shutdown circuit and power supply system. Background Technology

[0002] BAS usually refers to Building Automation System (BAS) used in power supply systems. BAS is a professional building automation control system that uses microcomputers and industry-standard networks to connect regional intelligent substations (i.e., DDCs) distributed in the monitoring site, and realizes centralized monitoring and management of building electromechanical equipment (such as power supply equipment) through specific terminal devices.

[0003] However, traditional technical solutions detect that the output voltage drops slowly when the voltage at the BAS port is lower than the reference voltage, and cannot quickly shut down the output, which cannot meet the requirements of applications where the next stage requires a faster falling edge. Utility Model Content

[0004] The main objective of this application is to provide an output fast shutdown circuit and power supply system, which aims to solve the technical problem in the prior art that when the voltage at the BAS port is detected to be less than the reference voltage, the output voltage drops relatively slowly and the output cannot be quickly shut off.

[0005] To achieve the above objectives, this application proposes an output fast shutdown circuit, which includes: an amplifier circuit, an energy storage circuit, a data acquisition circuit, and a first unidirectional conduction circuit.

[0006] The input terminal of the first unidirectional conduction circuit is connected to the amplification circuit and the acquisition circuit respectively, the output terminal of the first unidirectional conduction circuit is connected to the energy storage circuit, and the amplification circuit is connected to the acquisition circuit.

[0007] The acquisition circuit is used to send a shutdown signal to the first unidirectional conduction circuit when the detected voltage signal is less than a preset reference voltage.

[0008] The first unidirectional conduction circuit is used to disconnect the connection between the amplifier circuit and the energy storage circuit when a shutdown signal is received;

[0009] The amplifier circuit is also used to stop outputting when the connection with the energy storage circuit is broken.

[0010] Optionally, the amplification circuit includes: an operational amplifier;

[0011] The positive input terminal of the operational amplifier is connected to the input terminal of the first unidirectional conduction circuit and the acquisition circuit, respectively, and the negative input terminal of the operational amplifier is connected to the reference power supply.

[0012] The acquisition circuit is also used to send a conduction signal to the first unidirectional conduction circuit when the detected voltage signal is greater than the preset reference voltage.

[0013] The first unidirectional conduction circuit is used to conduct the connection between the amplifier circuit and the energy storage circuit when a conduction signal is received;

[0014] The operational amplifier is also used to send a boost signal to the energy storage circuit when the connection between the amplifier and the energy storage circuit is made active.

[0015] The energy storage circuit is used to charge and store energy when it receives a boost signal;

[0016] The first unidirectional conduction circuit is used to disconnect the operational amplifier from the energy storage circuit when a shutdown signal is received;

[0017] The operational amplifier is also used to stop outputting when the connection with the energy storage circuit is broken.

[0018] Optionally, the output fast shutdown circuit further includes: a second unidirectional conduction circuit;

[0019] The input terminal of the second unidirectional conduction circuit is connected to the input terminal of the amplifier circuit, the acquisition circuit, and the first unidirectional conduction circuit;

[0020] The acquisition circuit is also used to send a shutdown signal to the second unidirectional conduction circuit when the detected voltage signal is less than the preset reference voltage.

[0021] The second unidirectional conduction circuit is also used to conduct the connection between the acquisition circuit and ground when a shutdown signal is received and a preset conduction condition is met.

[0022] Optionally, the second unidirectional conduction circuit includes: a second diode;

[0023] The anode of the second diode is connected to the input terminal of the first unidirectional conduction circuit, the acquisition circuit, and the amplification circuit, respectively, and the cathode of the second diode is connected to the energy storage circuit.

[0024] Optionally, the first unidirectional conduction circuit includes: a first diode;

[0025] The anode of the first diode is connected to the amplifier circuit, the second unidirectional conduction circuit, and the acquisition circuit, respectively, and the cathode of the first diode is connected to the energy storage circuit.

[0026] Optionally, the energy storage circuit includes: a capacitor;

[0027] The first terminal of the capacitor is connected to the output terminal of the first unidirectional conduction circuit, and the second terminal of the capacitor is grounded.

[0028] Optionally, the acquisition circuit includes: a first resistor;

[0029] The first end of the first resistor is connected to the power supply system, and the second end of the first resistor is connected to the input terminal of the first unidirectional conduction circuit, the input terminal of the second unidirectional conduction circuit, and the amplifier circuit, respectively.

[0030] Optionally, the output fast shutdown circuit further includes: a second resistor and a third resistor;

[0031] The second end of the second resistor and the second end of the third resistor are respectively grounded. The first end of the third resistor is connected to the output terminal of the first unidirectional conduction circuit and the energy storage circuit respectively. The first end of the second resistor is connected to the second unidirectional conduction circuit.

[0032] In addition, to achieve the above objectives, this utility model also proposes a power supply system, which includes the output fast shutdown circuit as described above.

[0033] One or more technical solutions proposed in this application have at least the following effects:

[0034] This application discloses a fast output shutdown circuit and power supply system. The disclosed circuit includes an amplifier circuit, an energy storage circuit, a data acquisition circuit, and a first unidirectional conduction circuit. The input terminal of the first unidirectional conduction circuit is connected to both the amplifier circuit and the data acquisition circuit. The output terminal of the first unidirectional conduction circuit is connected to the energy storage circuit. The amplifier circuit is connected to the data acquisition circuit. The data acquisition circuit sends a shutdown signal to the first unidirectional conduction circuit when it detects that the voltage signal acquired by the data acquisition circuit is less than a preset reference voltage. The first unidirectional conduction circuit disconnects the connection between the amplifier circuit and the energy storage circuit upon receiving the shutdown signal. The amplifier circuit also stops outputting when the connection with the energy storage circuit is disconnected. Compared with the prior art, in this application, the amplifier circuit, through the unidirectional conduction of the first unidirectional conduction circuit, quickly stops outputting when it detects that the voltage signal acquired by the data acquisition circuit is less than a preset reference voltage, thus meeting the requirements of applications where a fast falling edge is required in the next stage. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the first embodiment of the fast output shutdown circuit proposed in this application.

[0037] Figure 2 This is a schematic diagram of the structure of the second embodiment of the fast output shutdown circuit proposed in this application.

[0038] Figure 3 This is a circuit schematic diagram of a second embodiment of the fast output shutdown circuit proposed in this application.

[0039] Figure 4 The output waveform of the amplifier circuit when the solution of this application is not adopted;

[0040] Figure 5 The output waveform of the amplifier circuit when the scheme of this application is adopted is shown.

[0041] Explanation of icon numbers:

[0042]

[0043] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not intended to limit this application.

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0047] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0048] The main solution of this application embodiment is: the amplifier circuit 1, through the unidirectional conductivity of the first unidirectional conduction circuit 4, quickly stops outputting when it detects that the voltage signal collected by the acquisition circuit 3 is less than the preset reference voltage.

[0049] This application provides a solution, proposing a fast output shutdown circuit and power supply system. The disclosed circuit includes: an amplifier circuit 1, an energy storage circuit 2, a data acquisition circuit 3, and a first unidirectional conduction circuit 4. The input terminal of the first unidirectional conduction circuit 4 is connected to both the amplifier circuit 1 and the data acquisition circuit 3, and the output terminal of the first unidirectional conduction circuit 4 is connected to the energy storage circuit 2. The amplifier circuit 1 is connected to the data acquisition circuit 3. The data acquisition circuit 3 sends a shutdown signal to the first unidirectional conduction circuit 4 when it detects that the voltage signal acquired by the data acquisition circuit 3 is less than a preset reference voltage. The first unidirectional conduction circuit 4 disconnects the connection between the amplifier circuit 1 and the energy storage circuit 2 upon receiving the shutdown signal. The amplifier circuit 1 also stops outputting when the connection with the energy storage circuit 2 is disconnected. Compared with the prior art, in this application, the amplifier circuit 1, through the unidirectional conduction of the first unidirectional conduction circuit 4, quickly stops outputting when it detects that the voltage signal acquired by the data acquisition circuit 3 is less than a preset reference voltage, meeting the requirements of applications with a fast falling edge in the next stage.

[0050] Based on this, the embodiments of this application provide an output fast shutdown circuit.

[0051] refer to Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the fast output shutdown circuit proposed in this application.

[0052] Considering that when the acquisition circuit 3 detects that the voltage at the BAS terminal is less than the reference voltage, the first unidirectional conduction circuit 4 causes the amplifier circuit 1 to quickly stop outputting. Furthermore, to meet the requirements of the next stage in applications requiring a fast falling edge, such as... Figure 1 As shown, the output fast shutdown circuit described in this embodiment includes: an amplifier circuit 1, an energy storage circuit 2, a data acquisition circuit 3, and a first unidirectional conduction circuit 4;

[0053] The input terminal of the first unidirectional conduction circuit 4 is connected to the amplifier circuit 1 and the acquisition circuit 3 respectively, and the output terminal of the first unidirectional conduction circuit 4 is connected to the energy storage circuit 2. The amplifier circuit 1 is connected to the acquisition circuit 3.

[0054] The acquisition circuit 3 is used to send a shutdown signal to the first unidirectional conduction circuit 4 when the detected voltage signal is less than the preset reference voltage.

[0055] The first unidirectional conduction circuit 4 is used to disconnect the connection between the amplifier circuit 1 and the energy storage circuit 2 when a shutdown signal is received;

[0056] The amplifier circuit 1 is also used to stop outputting when the connection with the energy storage circuit 2 is broken. It should be noted that the voltage signal is the voltage collected by the acquisition circuit 3 from the BAS (Building Automation System) terminal. The preset reference voltage can be provided by a reference power supply and can be set according to actual conditions; this embodiment does not impose any restrictions. The shutdown signal can be a voltage signal or a current signal and can be set according to actual conditions; this embodiment does not impose any restrictions.

[0057] In a specific implementation, the acquisition circuit 3 is used to send a shutdown signal to the first one-way conduction circuit 4 when the detected voltage signal is less than the preset reference voltage. The first one-way conduction circuit 4 is used to disconnect the connection between the amplification circuit 1 and the energy storage circuit 2 when it receives the shutdown signal. The amplification circuit 1 is also used to stop outputting when the connection with the energy storage circuit 2 is disconnected, thereby meeting the requirements of the next stage for applications with a fast falling edge.

[0058] It should be noted that, as Figure 4 and Figure 5 When the solution of this application is adopted, when the voltage (voltage signal) at the BAS terminal is less than the reference voltage, the amplifier circuit 1 quickly stops outputting.

[0059] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the fast output shutdown circuit proposed in this application.

[0060] Considering the output of amplifier circuit 1 when the acquisition circuit 3 detects that the voltage at the BAS terminal is greater than the reference voltage, such as... Figure 2 As shown, the amplifier circuit 1 in this embodiment includes: an operational amplifier U;

[0061] The positive input terminal of the operational amplifier U is connected to the input terminal of the first unidirectional conduction circuit 4 and the acquisition circuit 3, respectively, and the negative input terminal of the operational amplifier U is connected to the reference power supply.

[0062] The acquisition circuit 3 is also used to send a conduction signal to the first unidirectional conduction circuit 4 when the detected voltage signal is greater than the preset reference voltage.

[0063] The first unidirectional conduction circuit 4 is used to conduct the connection between the amplifier circuit 1 and the energy storage circuit 2 when a conduction signal is received;

[0064] The operational amplifier U is also used to send a boost signal to the energy storage circuit 2 when the connection between it and the energy storage circuit 2 is turned on;

[0065] The energy storage circuit 2 is used to charge and store energy when it receives a boost signal;

[0066] The first unidirectional conduction circuit 4 is used to disconnect the operational amplifier U from the energy storage circuit 2 when a shutdown signal is received;

[0067] The operational amplifier U is also used to stop outputting when the connection with the energy storage circuit 2 is broken.

[0068] It should be noted that the conduction signal can be either a voltage signal or a current signal, and can be set according to actual conditions. This embodiment does not impose any restrictions. When the acquisition circuit 3 detects that the voltage at the BAS terminal is greater than the reference voltage, the energy storage circuit 2 receives the voltage signal from the acquisition circuit 3 through the first unidirectional conduction circuit 4 and begins charging. The boost signal output by the amplifier circuit 1 also rises slowly as the voltage of the energy storage circuit 2 increases. The output terminal of the operational amplifier U can be connected to the load device, and can be set according to actual conditions. This embodiment does not impose any restrictions.

[0069] It is understood that amplifier circuit 1 can also be a MOSFET, which can be set according to the actual situation. This embodiment does not impose any restrictions.

[0070] In a specific implementation, the acquisition circuit 3 is further configured to send a conduction signal to the first unidirectional conduction circuit 4 when the detected voltage signal is greater than a preset reference voltage. The first unidirectional conduction circuit 4 is configured to connect the amplifier circuit 1 and the energy storage circuit 2 when it receives the conduction signal. The operational amplifier U is further configured to output a boost signal when the connection with the energy storage circuit 2 is connected. The first unidirectional conduction circuit 4 is configured to disconnect the connection between the operational amplifier U and the energy storage circuit 2 when it receives a shutdown signal. The operational amplifier U is further configured to stop outputting when the connection with the energy storage circuit 2 is disconnected, thereby achieving a slow rise in the boost signal output by the operational amplifier U when the voltage at the BAS terminal is greater than the reference voltage.

[0071] Furthermore, considering the need to further accelerate the output of the amplifier circuit 1 to stop quickly, and in order to meet the requirements of the next stage for applications with a fast falling edge, the output fast shutdown circuit also includes: a second unidirectional conduction circuit 5;

[0072] The input terminal of the second unidirectional conduction circuit 5 is connected to the input terminals of the amplifier circuit 1, the acquisition circuit 3, and the first unidirectional conduction circuit 4;

[0073] The acquisition circuit 3 is also used to send a shutdown signal to the second unidirectional conduction circuit 5 when the detected voltage signal is less than the preset reference voltage.

[0074] The second unidirectional conduction circuit 5 is also used to conduct the connection between the acquisition circuit 3 and ground when a shutdown signal is received and a preset conduction condition is met.

[0075] It should be noted that the voltage at the positive input terminal of operational amplifier U is u, and the preset reference voltage is u. REF The voltage of energy storage circuit 2 is u C The preset conduction condition is 0. <u<u C REF That is, the second unidirectional conduction circuit 5 conducts the connection between the acquisition circuit 3 and the ground, and the first unidirectional conduction circuit 4 disconnects the connection between the amplifier circuit 1 and the energy storage circuit 2.

[0076] In a specific implementation, the acquisition circuit 3 is also used to send a shutdown signal to the second unidirectional conduction circuit 5 when the detected voltage signal is less than the preset reference voltage. The second unidirectional conduction circuit 5 is also used to conduct the connection between the acquisition circuit 3 and ground when it receives the shutdown signal and meets the preset conduction conditions, so that the operational amplifier U stops outputting more quickly, thereby meeting the application scenarios where the next stage requires a fast falling edge.

[0077] Reference Figure 3 , Figure 3 ​This is a circuit schematic diagram of a second embodiment of the fast output shutdown circuit proposed in this application.

[0078] The second unidirectional conduction circuit 5 includes: a second diode D2;

[0079] The anode of the second diode D2 is connected to the input terminal of the first unidirectional conduction circuit 4, the acquisition circuit 3 and the amplification circuit 1, respectively, and the cathode of the second diode D2 is connected to the energy storage circuit 2.

[0080] In a specific implementation, when the anode voltage of the second diode D2 meets the preset conduction condition, it connects the acquisition circuit 3 and ground, thereby enabling the operational amplifier U to stop outputting more quickly, thus meeting the requirements of the next stage for applications with a fast falling edge.

[0081] Furthermore, the first unidirectional conduction circuit 4 includes: a first diode D1;

[0082] The anode of the first diode D1 is connected to the amplifier circuit 1, the second unidirectional conduction circuit 5 and the acquisition circuit 3 respectively, and the cathode of the first diode D1 is connected to the energy storage circuit 2.

[0083] In the specific implementation, when the acquisition circuit 3 detects that the voltage at the BAS terminal is greater than the reference voltage, the first diode turns on the connection between the energy storage circuit 2 and the amplifier circuit 1.

[0084] Furthermore, the energy storage circuit 2 includes: a capacitor C;

[0085] The first end of the capacitor C is connected to the output end of the first unidirectional conduction circuit 4, and the second end of the capacitor C is grounded.

[0086] In the specific implementation, when the acquisition circuit 3 detects that the voltage at the BAS terminal is greater than the reference voltage, the acquisition circuit 3 charges the capacitor C through the first diode D1.

[0087] Furthermore, the acquisition circuit 3 includes: a first resistor R1;

[0088] The first end of the first resistor R1 is connected to the power supply system, and the second end of the first resistor R1 is connected to the input terminal of the first unidirectional conduction circuit 4 and the amplifier circuit 1, respectively.

[0089] The first end of the first resistor R1 is connected to the power supply system, and the second end of the first resistor R1 is connected to the input terminal of the first unidirectional conduction circuit 4, the input terminal of the second unidirectional conduction circuit 5, and the amplifier circuit 1, respectively.

[0090] In the specific implementation, the first resistor R1 is used to detect the voltage at the BAS terminal.

[0091] Furthermore, the output fast shutdown circuit also includes: a second resistor R2 and a third resistor R3;

[0092] The second end of the second resistor R2 and the second end of the third resistor R3 are respectively grounded. The first end of the third resistor R3 is connected to the output end of the first unidirectional conduction circuit 4 and the energy storage circuit 2 respectively. The first end of the second resistor R2 is connected to the second unidirectional conduction circuit 5.

[0093] In the specific implementation, the second resistor R2 and the third resistor R3 are used to protect capacitor C when the voltage at the BAS terminal is greater than the reference voltage.

[0094] To achieve the above objectives, this application also proposes a power supply system, which includes the output fast shutdown circuit as described above.

[0095] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A fast output shutdown circuit, characterized in that, The fast output shutdown circuit is applied to a power supply system. The fast output shutdown circuit includes: an amplifier circuit, an energy storage circuit, a data acquisition circuit, and a first unidirectional conduction circuit. The input terminal of the first unidirectional conduction circuit is connected to the amplification circuit and the acquisition circuit respectively, the output terminal of the first unidirectional conduction circuit is connected to the energy storage circuit, and the amplification circuit is connected to the acquisition circuit. The acquisition circuit is used to send a shutdown signal to the first unidirectional conduction circuit when the detected voltage signal is less than a preset reference voltage. The first unidirectional conduction circuit is used to disconnect the connection between the amplifier circuit and the energy storage circuit when a shutdown signal is received; The amplifier circuit is also used to stop outputting when the connection with the energy storage circuit is broken.

2. The output fast shutdown circuit as described in claim 1, characterized in that, The amplifier circuit includes: an operational amplifier; The positive input terminal of the operational amplifier is connected to the input terminal of the first unidirectional conduction circuit and the acquisition circuit, respectively, and the negative input terminal of the operational amplifier is connected to the reference power supply. The acquisition circuit is also used to send a conduction signal to the first unidirectional conduction circuit when the detected voltage signal is greater than the preset reference voltage. The first unidirectional conduction circuit is used to conduct the connection between the amplifier circuit and the energy storage circuit when a conduction signal is received; The operational amplifier is also used to send a boost signal to the energy storage circuit when the connection between the amplifier and the energy storage circuit is made active. The energy storage circuit is used to charge and store energy when it receives a boost signal; The first unidirectional conduction circuit is used to disconnect the connection between the operational amplifier and the energy storage circuit when a shutdown signal is received; The operational amplifier is also used to stop outputting when the connection with the energy storage circuit is broken.

3. The output fast shutdown circuit as described in claim 1, characterized in that, The output fast shutdown circuit also includes: a second unidirectional conduction circuit; The input terminal of the second unidirectional conduction circuit is connected to the input terminal of the amplifier circuit, the acquisition circuit, and the first unidirectional conduction circuit; The acquisition circuit is also used to send a shutdown signal to the second unidirectional conduction circuit when the detected voltage signal is less than the preset reference voltage. The second unidirectional conduction circuit is also used to conduct the connection between the acquisition circuit and ground when a shutdown signal is received and a preset conduction condition is met.

4. The output fast shutdown circuit as described in claim 3, characterized in that, The second unidirectional conduction circuit includes: a second diode; The anode of the second diode is connected to the input terminal of the first unidirectional conduction circuit, the acquisition circuit, and the amplification circuit, respectively, and the cathode of the second diode is connected to the energy storage circuit.

5. The output fast shutdown circuit as described in claim 3, characterized in that, The first unidirectional conduction circuit includes: a first diode; The anode of the first diode is connected to the amplifier circuit, the second unidirectional conduction circuit, and the acquisition circuit, respectively, and the cathode of the first diode is connected to the energy storage circuit.

6. The output fast shutdown circuit as described in claim 1, characterized in that, The energy storage circuit includes: a capacitor; The first terminal of the capacitor is connected to the output terminal of the first unidirectional conduction circuit, and the second terminal of the capacitor is grounded.

7. The output fast shutdown circuit as described in claim 3, characterized in that, The acquisition circuit includes: a first resistor; The first end of the first resistor is connected to the power supply system, and the second end of the first resistor is connected to the input terminal of the first unidirectional conduction circuit, the input terminal of the second unidirectional conduction circuit, and the amplifier circuit, respectively.

8. The output fast shutdown circuit as described in claim 3, characterized in that, The output fast shutdown circuit also includes: a second resistor and a third resistor; The second end of the second resistor and the second end of the third resistor are respectively grounded. The first end of the third resistor is connected to the output terminal of the first unidirectional conduction circuit and the energy storage circuit respectively. The first end of the second resistor is connected to the second unidirectional conduction circuit.

9. A power supply system, characterized in that, The power supply system includes the output fast shutdown circuit as described in any one of claims 1 to 8.

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