A multifunctional instrument for on-line detection of power thyristor components

Abstract

A multifunctional instrument for on-line detection of power thyristor components, including a regulated power supply module, a voltage comparator module for component detection, an NE556 dual-time base integrated module, a status display and a fault output unit. The regulated power supply module provides a constant DC operating power supply for the voltage comparator module for component detection and the NE556 dual-time base integrated module. The voltage comparator module for component detection is used to detect whether the power thyristor is damaged, and uses the clamping characteristic of the diode to forcibly pull the potential of the comparison voltage Uf1 of the differential amplifier to the reference terminal. The NE556 dual-time base integrated module is used to detect whether there is overheating in the busbar connected to the power thyristor, including the NE556 dual-time base integrated circuit and the push-pull circuit. The present invention patent adopts a pure analog circuit design scheme, makes full use of the symmetry of the circuit structure and component parameters, and its unique parameter compensation principle realizes the on-line detection of thyristor component damage, effectively improving the stability of the main circuit in industries such as electroplating.

Description

Technical Field

[0001] This invention patent relates to the technical field of power thyristor component detection in the fields of electrolytic aluminum and electroplating, and specifically relates to a multifunctional instrument for on-line detection of power thyristor components. Background Art

[0002] In industrial fields such as electrolytic aluminum and electroplating, a DC power supply with high current and low voltage is required. This requires the power of power electronic devices to be as large as possible, but the requirements for detection are also getting higher and higher. For example, situations such as thyristor failure, too high water temperature, and heavy gas in the transformer, as well as high-voltage switching on and off and closed-loop regulation, will all affect the normal operation of the system. The detection method of thyristor components is generally designed one-to-one for a single tube in a single rectification system. However, there are many circuit topologies adopted by many high-power rectification systems. If corresponding detections are carried out by designing for different main circuit structures one by one, it will not only consume time and effort, but also lack generality. To detect components under many topologies, multiple detection circuits need to work simultaneously. The test process and wiring are cumbersome, and the system is also unreliable, easily resulting in inaccurate detection and misoperation, so that major "explosion" accidents occur in the rectification circuit. Moreover, the parameters of thyristor components cannot be detected in real time, making it difficult to recover from faults during later system maintenance, which will cause great maintenance difficulties. Summary of the Invention

[0003] The purpose of this invention patent is to provide a multifunctional instrument for on-line detection of power thyristor components that is simple in design, convenient to use, and capable of detecting all parameters of thyristor components in real time, so as to meet the real-time protection of the main circuit of the rectification system in fields such as electrolysis.

[0004] The following technical solutions are adopted to solve the technical problems of the present invention:

[0005] A multifunctional instrument for online detection of power thyristor components, comprising a regulated power supply module, a voltage comparator module for component detection, an NE556 dual-time-base integrated module, a status display and a fault output unit. The regulated power supply module provides a constant DC operating power supply for the voltage comparator module for component detection and the NE556 dual-time-base integrated module. The voltage comparator module for component detection is used to detect whether the power thyristor is damaged. By using the clamping characteristic of the diode, the potential of the comparison voltage Uf1 of the differential amplifier is forced to be pulled towards the reference terminal. When the power thyristor operates normally, the diode in the signal loop operates in the clamping state, making the comparison voltage Uf1 constant, and the output terminal of the differential amplifier is in the cut-off state. At this time, the current in the status display and fault output unit loop is zero. When the thyristor fails, the comparison voltage Uf1 changes, and the absolute value of the difference between it and the reference voltage Uref will not be equal to zero. The level of the output terminal of the differential amplifier is raised, injecting current, and the voltage across the status display and fault output unit loop reaches the threshold voltage of diode D400, and the relay JZC1 will act. The NE556 dual-time-base integrated module is used to detect whether there is overheating in the busbar connected to the power thyristor, including the NE556 dual-time-base integrated circuit and a push-pull circuit. When the charge and discharge loop operates normally, the freewheeling diode D401 in the status display and fault output unit loop is in the cut-off state. When the busbar is overheated, it causes the anode potential of the freewheeling diode D401 in the status display and fault output unit loop to change, generating an excitation that makes the triode Q401 operate in the saturation state, and the relay JZC2 will act.

[0006] The regulated power supply module includes a bridge rectifier circuit composed of D1, D2, D3, and D4. A +15V DC voltage is obtained by the L7815 voltage regulator chip, and then a front-stage and a rear-stage filter circuit composed of the L7815 voltage regulator chip and capacitors C10, C1, C20, and C2 is used to finally obtain a constant DC voltage at the output terminal.

[0007] The voltage comparator module for component detection uses the clamping characteristic of diode D2 to force the potential of the differential amplifier's comparison voltage Uf1 terminal towards the comparison terminal. The comparison voltage Uf1 terminal then forms a resistor-capacitor circuit composed of resistors R1, R2, and capacitor C30 to establish a constant voltage. Resistor R3 provides a reference voltage to the Uref terminal of differential amplifier U1:1 through a DC voltage source. The output terminal of differential amplifier U1:1 is connected to light-emitting diode D100 and resistor R100. When the input comparison voltage Uf1 is less than the reference voltage Uref, the output terminal of differential amplifier U1:1 is cut off, and light-emitting diode D100 operates in the cut-off state. At this time, the current in the state display and fault output unit loop is zero, indicating that the component of the power thyristor is intact. When the input comparison voltage Uf1 is greater than the reference voltage Uref, the output terminal of differential amplifier U1:1 is saturated, and light-emitting diode D100 operates in the conducting state. The voltage across the state display and fault output unit loop reaches the threshold voltage of diode Q400, indicating that the component of the power thyristor is damaged.

[0008] The NE556 dual-time-base integrated module detects whether the busbar of the power thyristor component is overheated, including the NE556 dual-time-base integrated circuit and a push-pull circuit. The states of the output terminals q1 and q2 of the NE556 dual-time-base integrated circuit will undergo periodic state flips. When the input signal is positive, NPN transistor Q1 in the bipolarity of the push-pull circuit conducts, and PNP transistor Q2 automatically cuts off due to the polarity. When the circuit input signal is negative, the state is exactly the opposite, and it can automatically complete the on and off operations regardless of how the signal changes. Then, the collectors of NPN transistor Q1 and PNP transistor Q2 are connected to the primary side of pulse transformer T1. An electrolytic capacitor C40 and a current-limiting resistor R300 are connected at the center tap of pulse transformer T1 to form a charge-discharge loop. The positive terminal of electrolytic capacitor C40 is connected to a current-limiting resistor R301 to provide a stable conduction voltage drop for the lighting of light-emitting diode D301.

[0009] The state display and fault output module includes a first alarm branch and a second alarm branch. The first alarm branch consists of a solid-state relay JZC1 containing a freewheeling diode D400, a PNP-type triode Q400, and a pull-up resistor R400. When the light-emitting diode D100 circuit of the component detection voltage comparator module works normally, the base potential and the emitter potential of the PNP-type triode Q400 are equal, and it is in the cut-off state of the freewheeling diode D400, and the solid-state relay JZC1 will not act. When the component is damaged, the light-emitting diode D100 works in the conducting state, causing the base potential of the PNP-type triode Q400 to change. At this time, the solid-state relay JZC1 will act. The state adopts a combination of a register and a combinational logic circuit. Before the switch quantity is output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time. The second alarm branch consists of a solid-state relay JZC2 containing a freewheeling diode D401, a PNP-type triode Q401, and a pull-up resistor R401. When the light-emitting diode D301 circuit of the component detection voltage comparator module works normally, the base potential and the emitter potential of the PNP-type triode Q401 are equal, the freewheeling diode D401 is in the cut-off state, and the solid-state relay JZC2 will not act. When the busbar is overheated, the dynamic balance of the NE556 dual-time-base integrated circuit and the push-pull circuit is broken, causing the base potential of the PNP-type triode Q401 to change, and the freewheeling diode D401 works in the conducting state. At this time, the solid-state relay JZC2 will act. The state adopts a combination of a register and a combinational logic circuit. Before the switch quantity is output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time.

[0010] The power supply indication of the regulated power supply module includes a DC regulated power supply interface, an input power supply, and a light-emitting diode D10, which provides the working state of the circuit board to the outside.

[0011] The voltage at the 1 input terminal of the differential amplifier U1 is guaranteed to be between 10 mV, and the offset voltage is controlled at 2 mV.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention adopts a pure analog circuit design scheme, makes full use of the symmetry of the circuit structure and component parameters, and its unique parameter compensation principle realizes the on-line detection of thyristor element damage, effectively improving the stability of the main circuit in industries such as electroplating. 2. The present invention adopts a bipolar circuit composed of a pulse transformer of a push-pull circuit and a NE556 dual-time-base integrated circuit, which has small detection error, strong driving ability, and the pulse transformer reduces the load of power amplification components, and can on-line monitor the busbar temperature, playing a protective role for the main circuit and improving the service life. 3. The present invention detects the thyristor element parameters all the time. The early warning and fault output states of the instrument adopt a combination of a register and a combinational logic circuit. Before the switch quantity is output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed, and the fault is responded in the first time, making the protection of power thyristors more reliable and fast. 4. The present invention is ingeniously designed, has a moderate volume, is easy to use, and is convenient for monitoring the damage and parameter performance of thyristor elements in industries such as electroplating and wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the circuit of the present invention;

[0014] Figure 2 is a schematic circuit diagram of the regulated power supply module of the present invention;

[0015] Figure 3 is a schematic circuit diagram of the voltage comparator module for element detection of the present invention;

[0016] Figure 4 is a schematic circuit diagram of the NE556 dual-time-base integrated module of the present invention;

[0017] Figure 5 is a schematic circuit diagram of the status display and fault output module of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to better understand the present invention, the present invention will be further described below with reference to the drawings and specific embodiments.

[0019] Such as Figure 1As shown in the figure, a multifunctional instrument for online detection of power thyristor components includes a regulated power supply module, a voltage comparator module for component detection, an NE556 dual-time-base integrated module, a status display and fault output unit. The regulated power supply module provides a constant DC working power supply for the voltage comparator module for component detection and the NE556 dual-time-base integrated module. The voltage comparator module for component detection is used to detect whether the power thyristor is damaged. By using the clamping characteristic of the diode, the potential of the comparison voltage Uf1 of the differential amplifier is forced to the reference end. Among them, the voltage at the 1:1 input end of the differential amplifier U1 is guaranteed to be between 10 mV, and the offset voltage is controlled at 2 mV. When the power thyristor works normally, the diode in the signal loop works in the clamping state, making the comparison voltage Uf1 constant, and the output end of the differential amplifier is in the cut-off state. At this time, the current in the status display and fault output unit loop is zero. When the thyristor fails, the comparison voltage Uf1 changes, and the absolute value of the difference from the reference voltage Uref will not be zero. The level of the output end of the differential amplifier is raised, injecting current, and the voltage across the status display and fault output unit loop reaches the threshold voltage of diode D400, and the relay JZC1 will act. The E556 dual-time-base integrated module is used to detect whether the busbar connected to the power thyristor is overheated, including the NE556 dual-time-base integrated circuit and the push-pull circuit. When the charge and discharge loop works normally, the freewheeling diode D401 in the status display and fault output unit loop is in the cut-off state. When the busbar is overheated, it causes the anode potential of the freewheeling diode D401 in the status display and fault output unit loop to change, generating an excitation that makes the triode Q401 work in the saturation state, and the relay JZC2 will act.

[0020] Figure 2 As shown in the figure, the regulated power supply module includes a bridge rectifier circuit composed of D1, D2, D3, and D4. A +15V DC voltage is obtained by the L7815 voltage regulator chip, and then a front and rear stage filter circuit composed of the L7815 voltage regulator chip and capacitors C10, C1, C20, and C2 is used to finally obtain a constant DC voltage at the output end. The power indication of the regulated power supply module includes a DC regulated power supply interface, an input power supply, and a light-emitting diode D10, which provides the working state of the circuit board to the outside.

[0021] Figure 3As shown in the figure, the voltage comparator module for component detection uses the clamping characteristic of diode D2 to force the potential of the comparison voltage Uf1 terminal of the differential amplifier to the comparison terminal. The comparison voltage Uf1 terminal then forms a resistor-capacitor circuit composed of resistors R1, R2, and capacitor C30 to establish a constant voltage. Resistor R3 provides a reference voltage to the Uref terminal of differential amplifier U1:1 through a DC voltage source. The output terminal of differential amplifier U1:1 is connected to light-emitting diode D100 and resistor R100. When the input comparison voltage Uf1 is less than the reference voltage Uref, the output terminal of differential amplifier U1:1 is cut off, and light-emitting diode D100 operates in the cut-off state. At this time, the current in the state display and fault output unit loop is zero, proving that the components of the power thyristor are intact. When the input comparison voltage Uf1 is greater than the reference voltage Uref, the output terminal of differential amplifier U1:1 is saturated, and light-emitting diode D100 operates in the conducting state. The voltage across the state display and fault output unit loop reaches the threshold voltage of diode Q400, proving that the components of the power thyristor are damaged.

[0022] Figure 4 As shown in the figure, the NE556 dual-time-base integrated module detects whether the busbar of the power thyristor component is overheated, including the NE556 dual-time-base integrated circuit and the push-pull circuit. The states of the output terminals q1 and q2 of the NE556 dual-time-base integrated circuit will flip periodically. When the input signal is positive, NPN transistor Q1 in the bipolarity of the push-pull circuit conducts, and PNP transistor Q2 automatically cuts off due to the polarity. When the circuit input signal is negative, the state is exactly the opposite. It can automatically complete the conduction and cut-off operations regardless of how the signal changes. Then, connect the collectors of NPN transistor Q1 and PNP transistor Q2 to the primary side of pulse transformer T1. A electrolytic capacitor C40 and a current-limiting resistor R300 are connected at the center tap of pulse transformer T1 to form a charge-discharge loop. The positive terminal of electrolytic capacitor C40 is connected to a current-limiting resistor R301 to provide a stable conduction voltage drop for the lighting of light-emitting diode D301.

[0023] Figure 5As shown in the figure, the status display and fault output module includes a first alarm branch and a second alarm branch. The first alarm branch consists of a solid-state relay JZC1 containing a freewheeling diode D400, a PNP-type triode Q400, and a pull-up resistor R400. When the light-emitting diode D100 circuit of the voltage comparator module for component detection works properly, the base potential and the emitter potential of the PNP-type triode Q400 are equal, and it is in the cut-off state of the freewheeling diode D400, and the solid-state relay JZC1 will not actuate; when the component is damaged, the light-emitting diode D100 works in the conduction state, causing the base potential of the PNP-type triode Q400 to change. At this time, the solid-state relay JZC1 will actuate. The status adopts a combination of a register and a combinational logic circuit. Before the switch quantity is output, it will be compared with the previous status, and then the fault will be confirmed. At the same time, the output status is refreshed to respond to the fault in the first time; the second alarm branch consists of a solid-state relay JZC2 containing a freewheeling diode D401, a PNP-type triode Q401, and a pull-up resistor R401. When the light-emitting diode D301 circuit of the voltage comparator module for component detection works properly, the base potential and the emitter potential of the PNP-type triode Q401 are equal, and the freewheeling diode D401 is in the cut-off state, and the solid-state relay JZC2 will not actuate; when the busbar is overheated, the dynamic balance of the NE556 dual-time base integrated circuit and the push-pull circuit is broken, causing the base potential of the PNP-type triode Q401 to change, and the freewheeling diode D401 works in the conduction state. At this time, the solid-state relay JZC2 will actuate. The status adopts a combination of a register and a combinational logic circuit. Before the switch quantity is output, it will be compared with the previous status, and then the fault will be confirmed. At the same time, the output status is refreshed to respond to the fault in the first time.

[0024] The specific process of using this invention patent for power thyristor component detection is as follows:

[0025] When the power thyristor works properly, the signal monitoring circuit will generate a comparison voltage Uf1 at the input terminal of the differential amplifier U1:1. When the power thyristor works properly, the diode D2 in the signal circuit works in clamping, and the Uf1 voltage is constant. At this time, the reference voltage is greater than the comparison voltage, the output terminal of the differential amplifier U1:1 is cut off, and the D100 light-emitting diode works in the cut-off state with zero current; when the thyristor is damaged, the balance of the signal circuit is broken. When the voltage at the input terminal Uref is lower than the voltage at the Uf1 terminal, the output terminal of the differential amplifier U1:1 is saturated, and the D100 light-emitting diode works in the conduction state.

[0026] The output terminals Q1 and Q2 of the NE556 dual-time base integrated circuit. When the Q1 signal is high level and the Q2 signal is low level, the NPN transistor Q1 in the bipolarity conducts, and the PNP transistor Q2 is in the cut-off state due to its polarity; at this time, the voltage at the center tap of the primary side of the pulse transformer T1 is equal to the regulated power supply voltage. If the busbar temperature reaches a certain set temperature value, the secondary side of the pulse transformer T1 is equivalent to being in a short-circuit state, the voltage at the center tap decreases, the current of the diode D301 increases, and the diode D301 is lit;

[0027] The status display and fault output module includes a first alarm branch and a second alarm branch. The first alarm branch consists of a solid-state relay JZC1 containing a freewheeling diode D400, a PNP-type transistor Q400, and a pull-up resistor R400. When the light-emitting diode D100 circuit is working normally, the base potential and the emitter potential of the PNP-type transistor Q400 are equal, and it is in the cut-off state of the freewheeling diode D400. When the component is damaged, the light-emitting diode D100 works in the conducting state, causing the base potential of the PNP-type transistor Q400 to change. At this time, the solid-state relay JZC1 will act. The status adopts a combination of a register and a combinational logic circuit. Before the digital output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time; The second alarm branch consists of a solid-state relay JZC2 containing a freewheeling diode D401, a PNP-type transistor Q401, and a pull-up resistor R401. When the light-emitting diode D301 circuit is working normally, the base potential and the emitter potential of the PNP-type transistor Q401 are equal, and the freewheeling diode D401 is in the cut-off state; When the busbar is overheated, the dynamic balance between the NE556 dual-time base integrated circuit and the push-pull circuit is broken, causing the base potential of the PNP-type transistor Q401 to change. The freewheeling diode D401 works in the conducting state. At this time, the solid-state relay JZC2 will act. The status adopts a combination of a register and a combinational logic circuit. Before the digital output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time.

Claims

1. A multifunctional instrument for on-line detection of power thyristor components, characterized in that: It includes a regulated power supply module, a voltage comparator module for component detection, an NE556 dual-time base integrated module, a status display and a fault output unit. The regulated power supply module provides a constant DC operating power supply for the voltage comparator module for component detection and the NE556 dual-time base integrated module. The voltage comparator module for component detection is used to detect whether the power thyristor is damaged. By using the clamping characteristic of the diode, the potential of the comparison voltage Uf1 of the differential amplifier is forced to pull towards the reference terminal. When the power thyristor is operating normally, the diode in the signal loop operates in the clamping state, making the comparison voltage Uf1 constant, and the output terminal of the differential amplifier is in the cut-off state. At this time, the current in the status display and fault output unit loop is zero. When a thyristor fault occurs, the comparison voltage Uf1 changes, and the absolute value of the difference from the reference voltage Uref will not be zero. The output terminal level of the differential amplifier is raised, injecting current. When the voltage across the status display and fault output unit loop reaches the threshold voltage of diode D400, the relay JZC1 will operate. The NE556 dual-time base integrated module is used to detect whether there is overheating in the busbar connected to the power thyristor, including the NE556 dual-time base integrated circuit and a push-pull circuit. When the busbar charge and discharge loop is operating normally, the freewheeling diode D401 in the status display and fault output unit loop is in the cut-off state. When the busbar is overheated, the anode potential of the freewheeling diode D401 in the status display and fault output unit loop changes, generating an excitation that makes the triode Q401 operate in the saturation state, and the relay JZC2 will operate.

2. The multifunctional instrument for online detection of power thyristor components according to claim 1, characterized in that: The regulated power supply module includes a bridge rectifier circuit composed of D1, D2, D3, and D4. A +15V DC voltage is obtained by the L7815 voltage regulator chip, and then a front and rear stage filter circuit composed of the L7815 voltage regulator chip and capacitors C10, C1, C20, and C2 is used to finally obtain a constant DC voltage at the output terminal.

3. The multifunctional instrument for online detection of power thyristor components according to claim 1 or 2, characterized in that: The voltage comparator module for component detection uses the clamping characteristic of diode D2 to force the potential of the comparison voltage Uf1 terminal of the differential amplifier towards the comparison terminal. The comparison voltage Uf1 terminal is then composed of a resistor-capacitor circuit formed by resistors R1, R2, and capacitor C30 to establish a constant voltage. Resistor R3 provides a reference voltage to the Uref terminal of the differential amplifier U1:1 through a DC voltage source. The output terminal of the differential amplifier U1:1 is connected to the light-emitting diode D100 and resistor R100. When the input comparison voltage Uf1 is less than the reference voltage Uref, the output terminal of the differential amplifier U1:1 is cut off, and the light-emitting diode D100 operates in the cut-off state. At this time, the current in the status display and fault output unit loop is zero, proving that the components of the power thyristor are intact. When the input comparison voltage Uf1 is greater than the reference voltage Uref, the output terminal of the differential amplifier U1:1 is saturated, and the light-emitting diode D100 operates in the conducting state. The voltage across the status display and fault output unit loop reaches the threshold voltage of diode Q400, proving that the components of the power thyristor are damaged at this time.

4. The multifunctional instrument for online detection of power thyristor components according to claim 3, characterized in that: The NE556 dual-time-base integrated module detects whether the busbar of the thyristor component is overheated, including the NE556 dual-time-base integrated circuit and the push-pull circuit. The states of the output terminals q1 and q2 of the NE556 dual-time-base integrated circuit will undergo periodic state flips. When the input signal is positive, the NPN transistor Q1 in the bipolarity of the push-pull circuit conducts, and the PNP transistor Q2 is automatically cut off due to the polarity. When the circuit input signal is negative, the state is exactly the opposite. It can automatically complete the work of conduction and cut-off regardless of how the signal changes; then connect the collectors of the NPN transistor Q1 and the PNP transistor Q2 to the primary side of the pulse transformer T1. An electrolytic capacitor C40 and a current-limiting resistor R300 are connected at the center tap of the pulse transformer T1 to form a charge-discharge loop. The positive terminal of the electrolytic capacitor C40 is connected to a current-limiting resistor R301 to provide a stable conduction voltage drop for the lighting of the light-emitting diode D301.

5. The multifunctional instrument for online detection of power thyristor components according to claim 1 or 4, characterized in that: The state display and fault output module includes a first alarm branch and a second alarm branch. The first alarm branch consists of a solid-state relay JZC1 containing a freewheeling diode D400, a PNP-type transistor Q400, and a pull-up resistor R400. When the light-emitting diode D100 circuit of the voltage comparator module for component detection works normally, the base potential and the emitter potential of the PNP-type transistor Q400 are equal, and it is in the cut-off state of the freewheeling diode D400, and the solid-state relay JZC1 will not act; when the component is damaged, the light-emitting diode D100 works in the conduction state, causing the base potential of the PNP-type transistor Q400 to change. At this time, the solid-state relay JZC1 will act. The state adopts a combination of a register and a combinational logic circuit. Before the switch quantity output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time; The second alarm branch consists of a solid-state relay JZC2 containing a freewheeling diode D401, a PNP-type transistor Q401, and a pull-up resistor R401. When the light-emitting diode D301 circuit of the voltage comparator module for component detection works normally, the base potential and the emitter potential of the PNP-type transistor Q401 are equal, and the freewheeling diode D401 is in the cut-off state, and the solid-state relay JZC2 will not act; when the busbar is overheated, the dynamic balance of the NE556 dual-time-base integrated circuit and the push-pull circuit is broken, causing the base potential of the PNP-type transistor Q401 to change, and the freewheeling diode D401 works in the conduction state. At this time, the solid-state relay JZC2 will act. The state adopts a combination of a register and a combinational logic circuit. Before the switch quantity output, it will be compared with the previous state, and then the fault will be confirmed. At the same time, the output state is refreshed to respond to the fault in the first time.

6. The multifunctional instrument for online detection of power thyristor components according to claim 1 or 4, characterized in that: The power supply indication of the regulated power supply module includes a DC regulated power supply interface, an input power supply, and a light-emitting diode D10 to provide the working state of the circuit board to the outside.

7. The multifunctional instrument for online detection of power thyristor components according to claim 3, characterized in that: For the differential amplifier U1:1, the input terminal voltage is guaranteed to be between 10 mV, and the offset voltage is controlled at 2 mV.

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