A diode short circuit detection circuit, method and dual-circuit power supply system

Abstract

The present invention discloses a diode short-circuit detection circuit, method and dual-circuit power supply system. The diode short-circuit detection circuit is used for short-circuit detection of diodes, and includes: an energy storage unit connected to one end of a diode, the energy storage unit is used to store electrical energy; a switch unit connected to the energy storage unit and the other end of the diode, the switch unit is used to switch on and off the connection between the energy storage unit and the other end of the diode; a control unit connected to the switch unit, the energy storage unit and the two ends of the diode, the control unit is used to control the switch unit to conduct the energy storage unit and the other end of the diode and detect the voltage at both ends of the diode, so as to obtain the short-circuit detection result of the diode according to the voltage at both ends of the diode. The diode short-circuit detection circuit of the present application can be applied to short-circuit detection of diodes in different circuit scenarios, and the detection reliability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a diode short-circuit detection circuit, method and dual-circuit power supply system. Background Art

[0002] Dual-circuit power supply is a common power supply method that aims to improve the reliability and stability of power supply. Dual-circuit power supply refers to connecting an electrical device or line to two different power circuits at the same time to achieve dual power supply. Diodes play an important role in the dual-circuit power supply architecture. In the dual-circuit power supply architecture, it is relatively easy to detect when the diode is open-circuited, but it is not easy to detect when the diode is short-circuited. Generally, the voltage of the other circuit is raised to see if there is a reverse current in the diode to determine whether it is short-circuited. However, since the voltage cannot be raised in many application scenarios, this method has great limitations. In a special case, it is difficult to detect a diode short circuit. Summary of the invention

[0003] The embodiments of the present invention provide a diode short-circuit detection circuit, method and dual-circuit power supply system to solve the problem of difficulty in diode short-circuit detection in the dual-circuit power supply system.

[0004] In a first aspect, an embodiment of the present invention provides a diode short circuit detection circuit for diode short circuit detection, which includes:

[0005] An energy storage unit connected to one end of the diode, the energy storage unit being used to store electrical energy;

[0006] A switch unit, connecting the energy storage unit and the other end of the diode, the switch unit being used to switch on and off the connection between the energy storage unit and the other end of the diode;

[0007] A control unit is connected to the switch unit, the energy storage unit and the two ends of the diode, and the control unit is used to control the switch unit to conduct the energy storage unit and the other end of the diode and detect the voltage across the diode to obtain the short circuit detection result of the diode according to the voltage across the diode.

[0008] In the diode short circuit detection circuit provided in an embodiment of the present invention, the switch unit includes a first switch device, the first switch device is provided with a first connection end, a second connection end and a first control end, the first connection end is connected to the anode of the diode, the second connection end is connected to the energy storage unit, the energy storage unit is connected to the cathode of the diode, and the first control end is connected to the control unit, wherein the first switch device controls the on and off of the first connection end and the second connection end according to the control signal received by the first control end from the control unit.

[0009] In the diode short circuit detection circuit provided in an embodiment of the present invention, the first switch device is a MOS tube, the first connection end is the drain of the MOS tube, the second connection end is the source of the MOS tube, and the first control end is the gate of the MOS tube.

[0010] In the diode short circuit detection circuit provided in the embodiment of the present invention, the first switching device is a transistor, the first connection end is the collector of the transistor, the second connection end is the emitter of the transistor, and the first control end is the base of the transistor.

[0011] In the diode short circuit detection circuit provided in an embodiment of the present invention, the first switching device is a relay, the first connection end is a common terminal of the relay, the second connection end is a normally open terminal of the relay, and the first control end is a control terminal of the relay.

[0012] In the diode short circuit detection circuit provided in the embodiment of the present invention, the energy storage unit includes a first capacitor, one end of the first capacitor is connected to the second connection end of the first switch device, and the other end is connected to the cathode of the diode.

[0013] In the diode short circuit detection circuit provided by the embodiment of the present invention, the first capacitor is a polarized capacitor, and the positive terminal of the first capacitor is connected to the cathode of the diode.

[0014] In a second aspect, an embodiment of the present invention provides a diode short circuit detection method, which is applied to the diode short circuit detection circuit described in the first aspect above, and the method includes: controlling the switch unit to connect the energy storage unit and the other end of the diode; detecting the voltage across the diode; and obtaining the detection result based on the voltage across the diode.

[0015] In a third aspect, an embodiment of the present invention provides a dual-circuit power supply system, which includes: a load unit; a main power supply unit, including a power supply diode, the power supply diode is connected to the load unit, and the main power supply unit is used to provide a main voltage to the load unit through the power supply diode; a backup power supply unit, connected to the power supply diode, and the backup power supply unit is used to provide a backup voltage to the load unit; a diode short-circuit detection circuit, connected to both ends of the power supply diode for short-circuit detection of the power supply diode, wherein the diode short-circuit detection circuit is the diode short-circuit detection circuit described in the first aspect above.

[0016] An embodiment of the present invention provides a diode short-circuit detection circuit, method and dual-circuit power supply system, wherein the diode short-circuit detection circuit is used for diode short-circuit detection, and comprises: an energy storage unit, a switch unit and a control unit; the energy storage unit is connected to one end of the diode, and the energy storage unit is used to store electrical energy; the switch unit is connected to the energy storage unit and the other end of the diode, and the switch unit is used to open and close the connection between the energy storage unit and the other end of the diode; the control unit is connected to the switch unit, the energy storage unit and both ends of the diode, and the control unit is used to control the switch unit to connect the energy storage unit and the other end of the diode and detect the voltage across the diode, so as to obtain the short-circuit detection result of the diode according to the voltage across the diode. The diode short-circuit detection circuit of the present application is connected to the diode through an energy storage unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0018] Figure 1 A structural block diagram of a diode short circuit detection circuit provided by an embodiment of the present invention;

[0019] Figure 2 A circuit diagram of a diode short circuit detection circuit provided by an embodiment of the present invention;

[0020] Figure 3 A structural block diagram of a dual-circuit power supply system provided by an embodiment of the present invention;

[0021] Figure 4 A circuit diagram of a dual-circuit power supply system provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a process flow of a diode short circuit detection method provided by an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the sub-step flow chart of the diode short circuit detection method provided by an embodiment of the present invention;

[0024] The reference numerals in the figures are:

[0025] 100. Diode short-circuit detection circuit; 10. Energy storage unit; 20. Switch unit; 21. First switch device; 30. Control unit; 200. Dual-circuit power supply system; 210. Main power supply unit; 211. Power supply diode; 220. Backup power supply unit; 230. Load unit. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but are not used to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0028] Reference Figure 1 and Figure 2 , which shows an embodiment of the diode short-circuit detection circuit provided by the present invention. The structure and working principle of the diode short-circuit detection circuit are described in detail below in conjunction with the drawings of the specification. The diode short-circuit detection circuit is used for short-circuit detection of diodes, and includes an energy storage unit 10, a switch unit 20 and a control unit 30; the energy storage unit 10 is connected to one end of the diode, and the energy storage unit 10 is used to store electrical energy; the switch unit 20 is connected to the energy storage unit 10 and the other end of the diode, and the switch unit 20 is used to connect or disconnect the energy storage unit 10 and the other end of the diode; the control unit 30 is connected to the switch unit 20, the energy storage unit 10 and the two ends of the diode, and the control unit 30 is used to control the switch unit 20 to connect the energy storage unit 10 and the other end of the diode and detect the voltage at both ends of the diode, so as to obtain the short-circuit detection result of the diode according to the voltage at both ends of the diode.

[0029] In a specific implementation, the diode short circuit detection circuit is applied to a circuit system having a diode to perform short circuit detection on the diode. This embodiment takes the short circuit detection scenario of the diode D1 as an example. Figure 1As shown, input is used to represent the input of the diode D1, and output is used to represent the output of the diode D1. The diode short-circuit detection circuit includes an energy storage unit 10, a switch unit 20 and a control unit 30. The energy storage unit 10 is connected to one end of the diode D1, and the switch unit 20 is connected to the energy storage unit 10 and the other end of the diode D1. The energy storage unit 10 and the switch unit 20 are each connected to one end of the diode D1. The energy storage unit 10 can be connected to the anode of the diode D1 or the cathode of the diode D1. When the energy storage unit 10 is connected to the anode of the diode D1, the switch unit 20 is connected to the cathode of the diode D1. When the energy storage unit 10 is connected to the cathode of the diode D1, the switch unit 20 is connected to the anode of the diode D1. The switch unit 20 is specifically designed using an electrically controlled switch element, such as a switch tube, a relay, an optocoupler and other components. The energy storage unit 10 is used to store electric energy. It will store electric energy when there is voltage input. The electric energy stored in the energy storage unit 10 is limited, so that the energy storage unit 10 generates a fixed voltage after storing full electric energy. The energy storage unit 10 can be specifically designed with energy storage components such as capacitors. The switch unit 20 is used to open and close the connection between the energy storage unit 10 and the other end of the diode D1, that is, the switch unit 20 can connect the energy storage unit 10 and the other end of the diode D1, and can also disconnect the energy storage unit 10 and the other end of the diode D1. The control unit 30 connects the switch unit 20, the energy storage unit 10 and the two ends of the diode D1. The control unit 30 is a programmable logic control unit, such as a single-chip microcomputer, a SOC chip, etc. The control unit 30 controls the operation of the switch unit 20. The control unit 30 controls the switch unit 20 to connect the energy storage unit 10 and the other end of the diode D1, and detects the voltage across the two ends of the diode D1. The control unit 30 can obtain the short circuit detection result of the diode D1 according to the voltage across the two ends of the diode D1. In practical applications, when short-circuit detection is performed, the control unit 30 controls the switch unit 20 to connect the energy storage unit 10 with the other end of the diode D1, and detects the voltage across the diode D1. In the case of a short circuit in the diode D1, the PN junction in the diode D1 breaks down, the voltage drop on the diode D1 is zero, and the branch where the energy storage unit 10 is located is short-circuited, so that the energy storage unit 10 cannot store electrical energy, and the energy storage unit 10 cannot generate voltage. At this time, the control unit 30 can detect that the voltage across the diode D1 is zero, and then determine that the diode D1 is short-circuited; when the diode D1 is normal, the energy storage unit 10 will store electrical energy normally, and generate a fixed voltage after being fully charged. The voltage of the energy storage unit 10 when it is fully charged is known. At this time, the control unit 30 can detect that the voltage value across the diode D1 is equal to the voltage value generated on the energy storage unit 10, and then it can be detected that the diode D1 is not short-circuited.Therefore, the control unit 30 can determine the short-circuit condition of the diode D1 in the circuit by only controlling the switch unit 20 to connect the energy storage unit 10 and the other end of the diode D1, which can be applicable to the short-circuit detection of the diode D1 in different circuit scenarios.

[0030] The diode short-circuit detection circuit of this embodiment connects an energy storage unit to one end of a diode to store electrical energy, and connects a switch unit to the other end of the energy storage unit and the diode to open and close the connection between the energy storage unit and the other end of the diode. The switch unit is controlled by a control unit to connect the energy storage unit and the other end of the diode and detect the voltage across the diode. The short-circuit detection result of the diode is obtained based on the voltage across the diode. The structure is simple and can be applied to short-circuit detection of diodes in different circuit scenarios.

[0031] In one embodiment, referring to Figure 2, the switch unit 20 includes a first switch device 21, the first switch device 21 is provided with a first connection end, a second connection end and a first control end, the first connection end is connected to the anode of the diode D1, the second connection end is connected to the energy storage unit 10, the energy storage unit 10 is connected to the cathode of the diode D1, and the first control end is connected to the control unit 30, wherein the first switch device 21 controls the on and off of the first connection end and the second connection end according to the control signal of the control unit 30 received by the first control end. In a specific implementation, the switch unit 20 includes a first switch device 21, the first switch device 21 is an electrically controlled switch element, which can be a switch tube, a relay, an optical coupler and other components. The first switch device 21 is provided with a first connection end, a second connection end and a first control end, the first connection end of the first switch device 21 is connected to the anode of the diode D1, the second connection end is connected to the energy storage unit 10, the first connection end and the second connection end play a major role in signal connection, the energy storage unit 10 is connected to the cathode of the diode D1, the first control end of the first switch device 21 is connected to the control unit 30, and the first control end of the first switch device 21 mainly plays a role in signal control. The control unit 30 controls the operation of the first switch device 21 by outputting a control signal to the first control terminal, and the first switch device 21 controls the on and off of the first connection terminal and the second connection terminal according to the control signal output by the control unit 30 received by the first control terminal. In practical applications, when the short circuit detection of the diode D1 is performed, the control unit 30 outputs a control signal to the first control terminal of the first switch device 21, so that the first connection terminal and the second connection terminal of the first switch device 21 are turned on, so that the anode of the diode D1 is turned on with the energy storage unit 10, and the energy storage unit 10 is also connected to the cathode of the diode D1, so that both ends of the diode D1 and the energy storage unit 10 are turned on. In the normal state of the diode D1, the energy storage unit 10 stores electrical energy and forms a fixed voltage. In the case of a short circuit of the diode D1, the voltage across the diode D1 is zero, and the branch where the energy storage unit 10 is located is also short-circuited, and the energy storage unit 10 cannot store electrical energy. The control unit 30 can know the short circuit condition of the diode D1 by detecting the voltage across the diode D1 and comparing it with the voltage of the energy storage unit 10.

[0032] Further, refer to Figure 2, the first switch device 21 is a MOS transistor Q1, the first connection end is the drain of the MOS transistor Q1, the second connection end is the source of the MOS transistor Q1, and the first control end is the gate of the MOS transistor Q1. In a specific implementation, the first switch device 21 is a MOS transistor Q1, the drain of the MOS transistor Q1 serves as the first connection end of the first switch device 21, the source of the MOS transistor Q1 serves as the second connection end of the first switch device 21, and the gate of the MOS transistor Q1 serves as the first control end of the first switch device 21, that is, the drain of the MOS transistor Q1 is connected to the anode of the diode D1, the source of the MOS transistor Q1 is connected to the energy storage unit 10, and the gate of the MOS transistor Q1 is connected to the control unit 30 to receive a control signal from the control unit 30. The control unit 30 can control the MOS transistor Q1 to turn on by outputting a high level as a control signal, and control the MOS transistor Q1 to turn off by outputting a low level as a control signal. The MOS transistor Q1 is used as a switch between the anode of the diode D1 and the energy storage unit 10, so that reliable on-off control between the anode of the diode D1 and the energy storage unit 10 can be achieved.

[0033] In one embodiment, the first switch device 21 is a triode, the first connection end is the collector of the triode, the second connection end is the emitter of the triode, and the first control end is the base of the triode. In a specific implementation, the first switch device 21 adopts a triode, the collector of the triode serves as the first connection end of the first switch device 21, the emitter of the triode serves as the second connection end of the first switch device 21, and the base of the triode serves as the first control end of the first switch device 21, that is, the collector of the triode is connected to the anode of the diode D1, the emitter of the triode is connected to the energy storage unit 10, and the base of the triode is connected to the control unit 30 to receive a control signal of the control unit 30. The control unit 30 can control the triode to conduct by outputting a high level as a control signal, and control the triode to cut off by outputting a low level as a control signal. The triode is used as a switch between the anode of the diode D1 and the energy storage unit 10, so that reliable on-off control between the anode of the diode D1 and the energy storage unit 10 can be achieved.

[0034] In one embodiment, the first switch device 21 is a relay, the first connection end is a common terminal of the relay, the second connection end is a normally open terminal of the relay, and the first control end is a control terminal of the relay. In a specific implementation, the first switch device 21 adopts a relay, the common terminal of the relay serves as the first connection end of the first switch device 21, the normally open terminal of the relay serves as the second connection end of the first switch device 21, and the control terminal of the relay serves as the first control end of the first switch device 21, that is, the common terminal of the relay is connected to the anode of the diode D1, the normally open terminal of the relay is connected to the energy storage unit 10, and the control terminal of the relay is connected to the control unit 30 to receive a control signal of the control unit 30. The control unit 30 can control the normally open terminal of the relay to close the contact with the common terminal by outputting current as a control signal, and control the normally open terminal of the relay to disconnect from the common terminal by stopping the output current as a control signal. The relay is used as a switch between the anode of the diode D1 and the energy storage unit 10, so that reliable on-off control between the anode of the diode D1 and the energy storage unit 10 can be achieved.

[0035] In one embodiment, referring to Figure 2, the energy storage unit 10 includes a first capacitor C1, one end of which is connected to the second connection end of the first switch device 21, and the other end is connected to the cathode of the diode D1. In a specific implementation, the energy storage unit 10 includes a first capacitor C1, one end of which is connected to the second connection end of the first switch device 21, and the other end of which is connected to the cathode of the diode D1. Thus, the first switch device 21 and the first capacitor C1 are connected in parallel at both ends of the diode D1, and the capacity of the first capacitor C1 can be designed according to actual needs. In actual applications, when short-circuit detection is performed, the control unit 30 controls the first switch device 21 to connect the energy storage unit 10 and the anode of the diode D1, and detects the voltage across the diode D1. When the diode D1 is short-circuited, the PN junction in the diode D1 breaks down, the voltage drop on the diode D1 is zero, and the branch where the first capacitor C1 is located is short-circuited, so that the first capacitor C1 cannot be charged. There is no voltage across the first capacitor C1. At this time, the control unit 30 can detect that the voltage across the diode D1 is zero, and then determine that the diode D1 is short-circuited; when the diode D1 is normal, the first capacitor C1 is normally fully charged, and the first capacitor C1 generates a fixed voltage. The voltage across the first capacitor C1 can be known based on the first capacitor C1. At this time, the control unit 30 can detect that the voltage value across the diode D1 is equal to the voltage value generated by the first capacitor C1, and then it can be detected that the diode D1 is not short-circuited. Therefore, the control unit 30 only needs to control the first switch device 21 to connect the energy storage unit 10 and the other end of the diode D1 to determine the short-circuit condition of the diode D1 in the circuit, which can be applicable to the short-circuit detection of the diode D1 in different circuit scenarios.

[0036] Further, refer to Figure 2 , the first capacitor C1 is a polar capacitor, and the positive terminal of the first capacitor C1 is connected to the cathode of the diode D1. In a specific implementation, the first capacitor C1 is a polar capacitor, and the first capacitor C1 has a positive and negative pole, one end of the first capacitor C1 and the cathode of the diode D1 is the positive terminal, and the second connection end of the first capacitor C1 connected to the first switch device 21 is the negative terminal.

[0037] In one embodiment, a dual-circuit power supply system 200 is provided. Figure 3 and Figure 4As shown, the dual-circuit power supply system 200 includes a load unit 230, a main power supply unit 210, a backup power supply unit 220 and the diode short-circuit detection circuit 100 described in the above embodiment; the main power supply unit 210 includes a power supply diode 211, the power supply diode 211 is connected to the load unit 230, and the main power supply unit 210 is used to provide a main voltage to the load unit 230 through the power supply diode 211; the backup power supply unit 220 is connected to the power supply diode 211, and the backup power supply unit 220 is used to provide a backup voltage to the load unit 230; the diode short-circuit detection circuit 100 is connected to both ends of the power supply diode 211 for short-circuit detection of the power supply diode 211. In a specific implementation, the load unit 230 is an electrical device or an electrical system. When the system is operating normally, the main power supply unit 210 provides the load unit 230 with a main voltage through the power supply diode 211. When the main power supply unit 210 supplies power, the power supply diode 211 is turned on, and the power supply diode 211 can protect the safety of the load unit 230. The backup power supply unit 220 performs hot backup, that is, when the system is operating normally, the backup power supply unit 220 performs power backup operation. Specifically, Figure 4 As shown, the standby power supply unit 220 is a standby power supply DC / DC designed in a modular manner. The standby power supply DC / DC outputs a standby voltage Vdc. The output standby voltage Vdc is lower than the main voltage Vo output by the cathode of the diode. The standby power supply unit 220 serves as a standby power supply route. When the input of the main power supply unit 210 fails, the standby power supply unit 220 takes over and provides the load unit 230 with a standby voltage. The switching of the standby power supply unit 220 can be completed specifically through the control system and the switching circuit. In order to ensure the reliable operation of the system, it is necessary to regularly check whether the power supply diode 211 is faulty. The fault of the power supply diode 211 generally includes an open circuit or a short circuit. It is very easy to detect an open circuit of the power supply diode 211. It only needs to detect whether the current idio of the power supply diode 211 is zero and whether the main power supply voltage Vo is equal to the standby power supply voltage Vdc. The short circuit detection of the power supply diode 211 is completed by the diode short circuit detection circuit 100, and the diode short circuit detection circuit 100 is connected to both ends of the power supply diode 211. When the power supply diode 211 is short-circuited, the diode short circuit detection circuit 100 can quickly and accurately detect the short circuit fault, and the user can locate the fault of the power supply diode 211 in time, which is convenient for system maintenance. Since the specific structure and working principle of the diode short circuit detection circuit 100 have been introduced in detail in the previous description, they will not be repeated here for the sake of brevity.

[0038] The dual-circuit power supply system in this embodiment, because it adopts the diode short-circuit detection circuit provided by the present invention, can accurately locate the short-circuit fault of the diode, and the system operation is more stable and reliable.

[0039] In one embodiment, a diode short circuit detection method is provided, and the diode short circuit detection method is applied to the diode short circuit detection circuit described in the above embodiment, such as Figure 5 As shown, the diode short circuit detection method includes steps: S110-S130.

[0040] S110, controlling the switch unit to conduct the energy storage unit and the other end of the diode.

[0041] In a specific implementation, when a short circuit is detected on a diode, the control unit outputs a control signal to the switch unit, so that the switch unit conducts the energy storage unit with the other end of the diode.

[0042] S120: Detect the voltage across the diode.

[0043] In a specific implementation, after the control unit controls the switch unit to conduct the energy storage unit and the other end of the diode, the control unit detects the voltage across the diode to obtain the voltage condition across the diode.

[0044] S130: Obtain a detection result according to the voltage across the diode.

[0045] In a specific implementation, after the control unit controls the switch unit to connect the energy storage unit and the other end of the diode, when the diode is short-circuited, the PN junction in the diode breaks down, the voltage drop on the diode is zero, and the branch where the energy storage unit is located is short-circuited, making it impossible for the energy storage unit to store electrical energy and generate voltage. At this time, the control unit can detect that the voltage across the diode is zero; when the diode is normal and not short-circuited, the energy storage unit stores electrical energy normally and generates a fixed voltage after being fully charged. Therefore, the control unit can determine whether the diode is short-circuited based on the relationship between the voltage across the diode and the voltage of the energy storage unit.

[0046] In one embodiment, if Figure 6 As shown, the step S130 of acquiring the detection result according to the voltage across the diode includes steps: S131-S134.

[0047] S131. Compare the voltage across the diode with the voltage of the energy storage unit.

[0048] In a specific implementation, after detecting the voltage across the diode, the control unit will compare the voltage across the diode with the voltage of the energy storage unit, using the voltage of the energy storage unit as a comparison standard, and determine whether the diode is short-circuited based on the comparison result.

[0049] S132: Determine whether the voltage across the diode is equal to the voltage of the energy storage unit.

[0050] In a specific implementation, the control unit compares the voltage across the diode with the voltage of the energy storage unit to determine whether the voltage across the diode is equal to the voltage of the energy storage unit, thereby determining whether the diode is short-circuited.

[0051] S133: If the voltage across the diode is equal to the voltage of the energy storage unit, it is determined that the diode is not short-circuited.

[0052] In a specific implementation, when the diode is normal and not short-circuited, the energy storage unit stores electrical energy normally and generates a fixed voltage after being fully charged. The voltage is applied to both ends of the diode. The voltage across the diode is equal to the voltage of the energy storage unit. The equality of the voltage across the diode and the voltage of the energy storage unit is mainly reflected in the equality of the voltage values. When the control unit determines that the voltage across the diode is equal to the voltage of the energy storage unit, it determines that the diode is not short-circuited.

[0053] S134: If the voltage across the diode is zero, it is determined that the diode is short-circuited.

[0054] In a specific implementation, when a diode is short-circuited, the PN junction inside the diode breaks down, the voltage drop across the diode is zero, and the branch where the energy storage unit is located is short-circuited, making it impossible for the energy storage unit to store electrical energy and generate voltage, so that the voltage across the diode is zero. When the control unit determines that the voltage value across the diode is zero, it determines that the diode is short-circuited.

[0055] The diode short circuit detection method of this embodiment controls the switch unit to connect the energy storage unit and the other end of the diode, then detects the voltage across the diode, and finally obtains the detection result based on the voltage across the diode. This can achieve accurate detection of diode short circuit faults, and the reliability of diode short circuit detection is higher.

[0056] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A diode short circuit detection circuit, used for diode short circuit detection, characterized in that: include: An energy storage unit connected to one end of the diode, the energy storage unit being used to store electrical energy; A switch unit, connecting the energy storage unit and the other end of the diode, the switch unit being used to switch on and off the connection between the energy storage unit and the other end of the diode; A control unit is connected to the switch unit, the energy storage unit and the two ends of the diode, and the control unit is used to control the switch unit to conduct the energy storage unit and the other end of the diode and detect the voltage across the diode to obtain the short circuit detection result of the diode according to the voltage across the diode.

2. The diode short circuit detection circuit according to claim 1, characterized in that: The switch unit includes a first switch device, which is provided with a first connection end, a second connection end and a first control end, the first connection end is connected to the anode of the diode, the second connection end is connected to the energy storage unit, the energy storage unit is connected to the cathode of the diode, and the first control end is connected to the control unit, wherein the first switch device controls the on and off of the first connection end and the second connection end according to the control signal received by the first control end from the control unit.

3. The diode short circuit detection circuit according to claim 2, characterized in that: The first switch device is a MOS tube, the first connection end is a drain of the MOS tube, the second connection end is a source of the MOS tube, and the first control end is a gate of the MOS tube.

4. The diode short circuit detection circuit according to claim 2, characterized in that: The first switching device is a transistor, the first connection end is the collector of the transistor, the second connection end is the emitter of the transistor, and the first control end is the base of the transistor.

5. The diode short circuit detection circuit according to claim 2, characterized in that: The first switching device is a relay, the first connection end is a common terminal of the relay, the second connection end is a normally open terminal of the relay, and the first control end is a control terminal of the relay.

6. The diode short circuit detection circuit according to any one of claims 2 to 5, characterized in that: The energy storage unit includes a first capacitor, one end of which is connected to the second connection end of the first switch device, and the other end of which is connected to the cathode of the diode.

7. The diode short circuit detection circuit according to claim 6, characterized in that: The first capacitor is a polarized capacitor, and a positive terminal of the first capacitor is connected to a cathode of the diode.

8. A diode short circuit detection method, characterized in that: Applied to the diode short circuit detection circuit according to any one of claims 1 to 7, the method comprising: Controlling the switch unit to conduct the energy storage unit and the other end of the diode; detecting the voltage across the diode; A detection result is obtained according to the voltage across the diode.

9. The diode short circuit detection method according to claim 8, characterized in that: The step of obtaining the detection result according to the voltage across the diode comprises: comparing the voltage across the diode with the voltage of the energy storage unit; Determining whether the voltage across the diode is equal to the voltage of the energy storage unit or is zero; If the voltage across the diode is equal to the voltage of the energy storage unit, it is determined that the diode is not short-circuited; If the voltage across the diode is zero, it is determined that the diode is short-circuited.

10. A dual-circuit power supply system, characterized in that: include: Load cell; A main power supply unit, comprising a power supply diode, the power supply diode being connected to the load unit, and the main power supply unit being used to provide a main voltage to the load unit through the power supply diode; A standby power supply unit, connected to the power supply diode, and configured to provide a standby voltage to the load unit; A diode short-circuit detection circuit is connected to both ends of the power supply diode for short-circuit detection of the power supply diode, wherein the diode short-circuit detection circuit is the diode short-circuit detection circuit according to any one of claims 1 to 7.

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