Rapid direct current control method and direct current control system

Abstract

The invention discloses a rapid direct current control method and a direct current control system. The method comprises the following steps: detecting states of a direct current conversion voltage value signal and a blocking signal in a direct current loop; judging whether the states of the voltage value signal and the blocking signal meet the requirement of disconnecting a loop power supply or not; and when the requirement of disconnecting the loop power supply is met, the on-off of the relay in the direct-current loop is controlled. According to the invention, the on-off of the relay is intelligently judged and rapidly controlled by monitoring the voltage and the blocking signal in real time, so that rapid and accurate control of the direct current loop is realized; according to the method, the safety and reliability of the system are improved, and the intelligent level of the system is improved by reducing human intervention; through the cooperation of the two groups of solid-state relays, the response speed and accuracy of control are improved, a power supply can be quickly cut off in an emergency, and equipment damage or accident expansion caused by delayed response is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of power system control, in particular to a fast direct current control method and a direct current control system. Background Art

[0002] In the power system, the DC power supply system is a core component that provides stable power for control, protection, signal and other equipment. However, the existing DC power supply system has deficiencies in the design of the control loop, especially in the response and processing capabilities under abnormal conditions. The traditional control loop relies on mechanical protection devices such as air switches, which only cut off the power supply in the event of a serious fault such as a short circuit. This passive protection method has a slow response and cannot respond to minor abnormalities such as voltage fluctuations in a timely manner, increasing the risk of system operation. In addition, the existing control loop lacks flexibility and intelligence, cannot be dynamically adjusted according to the operating conditions, and has limitations when processing external locking signals, resulting in slow response in emergency situations.

[0003] On the technical level, traditional relays have a long operating time and cannot meet the needs of rapid response. In addition, they are affected by environmental factors, and their reliability and durability are limited. In terms of system design, the single power supply limits the flexibility and safety of the system. The lack of effective voltage monitoring and analog-to-digital conversion mechanisms makes it impossible to achieve real-time monitoring and precise control of voltage. These problems affect the stability and reliability of the DC system, increase maintenance costs and the risk of system failure. Therefore, there is an urgent need for a new type of DC control module to improve response speed, intelligence level, reliability, and optimize system design. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is to achieve fast and accurate control in a DC system, especially in the face of voltage anomalies and locking signal states, to be able to disconnect or close the DC circuit in time to protect the control equipment and avoid greater risks caused by chain action behaviors.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a fast DC control method, which includes detecting a DC conversion voltage value signal and a state of a locking signal in a DC circuit; determining whether the voltage value signal and the locking signal state meet the requirements for disconnecting the loop power supply; and controlling the on and off of a relay in the DC circuit when the requirements for disconnecting the loop power supply are met.

[0008] As a preferred solution of the fast DC control method described in the present invention, the DC conversion voltage value signal is a digital signal after the DC voltage signal is converted by an analog-to-digital converter, and the DC conversion voltage value signal is detected in real time by a differential input method.

[0009] As a preferred solution of the fast DC control method of the present invention, the blocking signal in the DC circuit is a DC power supply input signal, and the state of the blocking signal in the DC circuit is detected by a microcontroller.

[0010] As a preferred solution of the fast DC control method of the present invention, the logic for judging whether the voltage value signal and the locking signal state meet the requirement of disconnecting the loop power supply is:

[0011] If the voltage value detected by the comparator is less than the preset voltage value and the blocking signal is in the on state, the DC circuit meets the requirement of disconnecting the circuit power supply, then the flipping action of the two sets of solid-state relays is triggered, the DC circuit power supply is cut off and an action signal is issued;

[0012] If the comparator detects a voltage value greater than a preset voltage value or an external blocking signal is present, the DC circuit is powered.

[0013] As a preferred solution of the fast DC control method described in the present invention, when the requirement for disconnecting the loop power supply is met, the microcontroller outputs a trigger signal for disconnecting the DC loop power supply, the first solid-state relay KM1 closes and sends out an alarm signal, and at the same time the second solid-state relay KM2 disconnects the DC loop.

[0014] In a second aspect, an embodiment of the present invention provides a fast DC control system, which includes a DC circuit, an acquisition module and a control module. The control module controls the opening and closing of the DC circuit by detecting a voltage value signal and a locking signal output by the acquisition module.

[0015] As a preferred solution of the fast DC control system of the present invention, the DC circuit is provided with a trip holding relay TBJ and an electromagnetic trip coil TQ, the trip holding relay TBJ is connected to the positive power supply through the normally open contact TBJ, and the other end is connected to the electromagnetic trip coil TQ through the auxiliary contact DL, and the other end of the electromagnetic trip coil TQ is also connected to the negative power supply through the second solid-state relay KM2; the two ends of the normally open contact TBJ are connected in parallel with a protective pressure plate, and the two ends of the normally open contact TBJ are also connected in parallel with a manual operating relay contact ST.

[0016] As a preferred solution of the fast DC control system of the present invention, the acquisition module is provided with a monitoring relay HWJ and an analog-to-digital converter DC, one end of the monitoring relay HWJ is connected to the control loop of the circuit breaker tripping coil TQ, and the other end is connected to the positive power supply, the analog-to-digital converter DC respectively acquires the voltage values ​​of the positive power supply and the negative power supply, and outputs the acquired DC voltage value to the comparator U3.

[0017] As a preferred solution of the fast DC control system of the present invention, wherein: the control module includes a comparator U3, the comparator U3 is connected to the first chip U2 through pin D1 and to the second chip U4 through pin D2; the comparator U3 judges the voltage value signal and performs analog-to-digital conversion through pin A0+ and pin A0- through a differential input mode; the control module also includes a third chip U7 that receives the voltage value signal and the locking signal, the comparator U3 is connected to the third chip U7 through pin KAIRU / DIN and pin KAIRU, and judges the locking signal state.

[0018] As a preferred solution of the fast DC control system of the present invention, the control module is further provided with a standby relay U1 connected to the pin D0 VAC of the comparator U3 and a voltage regulator U8 providing a 5V power supply.

[0019] The beneficial effects of the present invention are as follows: the present invention realizes rapid and accurate control of a DC circuit by real-time monitoring of voltage and locking signals, intelligent judgment, and rapid control of the on and off of relays; this method not only improves the safety and reliability of the system, but also improves the intelligence level of the system by reducing human intervention; through the coordination of two groups of solid-state relays, the response speed and accuracy of the control are improved, and the power supply can be quickly cut off in an emergency, effectively preventing equipment damage or accident expansion due to delayed response. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a flow chart of a fast DC control method;

[0022] Figure 2 It is the DC loop diagram of the fast DC control system;

[0023] Figure 3 It is a control module diagram of the fast DC control method;

[0024] Figure 4This is the overall flow chart of the fast DC control system. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1 , is the first embodiment of the present invention, which provides a fast DC control method, including:

[0030] S1: Detect the DC conversion voltage value signal and the blocking signal status in the DC circuit;

[0031] Furthermore, the DC conversion voltage value signal refers to a signal obtained after measuring the DC loop voltage, which can be an analog signal or a digital signal. In the present invention, it is converted into a digital signal by an analog-to-digital converter (ADC), which is more convenient for the microcontroller to process and judge.

[0032] Furthermore, the blocking signal is an external control signal used to forcibly maintain the DC circuit power supply under specific circumstances, and is generally used when the system is in a critical operation stage or needs to maintain the operation of specific equipment. In the present invention, the signal is a 220V DC power supply signal, indicating that when the signal exists, the system is in a state of needing power supply, and at this time, the DC circuit power supply should be maintained regardless of the voltage value.

[0033] S2: Determine whether the voltage value signal and the locking signal status meet the requirements for disconnecting the circuit power supply;

[0034] Furthermore, the requirement for disconnecting the DC loop power supply is determined by the voltage value signal and the blocking signal state. The requirement for disconnecting the loop power supply is met only when the voltage value exceeds a preset threshold and the blocking signal is not activated.

[0035] S3: Controls the on and off of the relay in the DC circuit when the requirements for disconnecting the circuit power supply are met.

[0036] Furthermore, the relay is a switching device used to control the on and off of the DC circuit. It can be a mechanical relay or a solid-state relay. The type of relay to be selected depends on the specific application scenario and the requirements for switching speed.

[0037] In summary, the present invention adds a locking signal mechanism to the control method based on voltage detection, which can effectively avoid erroneous power failure, improve the reliability of the system, and flexibly configure the power failure conditions according to actual needs. By detecting the locking signal, it is possible to avoid erroneous triggering of power failure protection at critical moments, realizing a fast, safe and reliable DC control method, thereby improving the reliability of system operation.

[0038] Example 2

[0039] Reference Figure 1 , which is a second embodiment of the present invention, and provides a fast DC control method, comprising:

[0040] S1: Detect the DC conversion voltage value signal and the blocking signal status in the DC circuit;

[0041] Specifically, the DC conversion voltage value signal is a digital signal obtained by converting the DC voltage signal through an analog-to-digital converter, and the DC conversion voltage value signal is detected in real time through a differential input method.

[0042] Specifically, the blocking signal in the DC circuit is a DC power input signal, and the state of the blocking signal in the DC circuit is detected by a microcontroller.

[0043] It should be noted that converting the DC voltage signal into a digital signal through an analog-to-digital converter and using a differential input method to monitor the voltage can reduce the impact of common-mode noise and improve the accuracy of voltage monitoring.

[0044] It should be noted that the detection of the blocking signal state is used to indicate whether the system should be locked. The state of the blocking signal is directly related to the power supply control of the DC circuit to ensure the safe operation of the system.

[0045] It should also be noted that real-time monitoring of the DC link voltage is crucial for rapid response to voltage anomalies. Through continuous voltage detection, abnormal conditions such as overvoltage and undervoltage can be discovered in time, thereby triggering corresponding protection actions and taking corresponding control measures.

[0046] S2: Determine whether the voltage value signal and the locking signal status meet the requirements for disconnecting the circuit power supply;

[0047] Specifically, the logic for determining whether the voltage value signal and the blocking signal state meet the requirement for disconnecting the circuit power supply is:

[0048] If the voltage value detected by the comparator is less than the preset voltage value and the blocking signal is in the on state, the DC circuit meets the requirement of disconnecting the circuit power supply, then the flipping action of the two sets of solid-state relays is triggered, the DC circuit power supply is cut off and an action signal is issued;

[0049] If the comparator detects a voltage value greater than a preset voltage value or an external blocking signal is present, the DC circuit is powered.

[0050] It should be noted that by detecting the state of the blocking signal, it is possible to determine whether the system is in a critical operation stage or other state where power supply needs to be maintained. When the blocking signal is activated, even if the voltage is abnormal, the power supply will not be disconnected immediately, thereby avoiding the risk of interruption of critical operations or loss of data.

[0051] It should also be noted that the present invention combines voltage detection and lock signal judgment to achieve more intelligent DC control. Only when the voltage value exceeds the preset threshold and the lock signal is not activated, the requirement of disconnecting the loop power supply is met. This logical combination effectively avoids the accidental power failure at the critical moment and improves the reliability of the system. Under the setting of the present invention, when the system performs a critical operation, even if the voltage fluctuates and exceeds the threshold, due to the existence of the lock signal, the system can still maintain power supply and ensure the completion of the operation.

[0052] S3: Controls the on and off of the relay in the DC circuit when the requirements for disconnecting the circuit power supply are met.

[0053] Specifically, when the requirement for disconnecting the loop power supply is met, the microcontroller outputs a trigger signal for disconnecting the DC loop power supply, the first solid-state relay KM1 closes and sends out an alarm signal, and the second solid-state relay KM2 disconnects the DC loop.

[0054] It should be noted that when the first solid-state relay KM1 is closed and sends out an alarm signal, it indicates that the power supply of the DC circuit has been cut off.

[0055] It should be noted that solid-state relays are selected because of their fast switching speed and short response time. The rated parameters of the first solid-state relay KM1 and the second solid-state relay KM2 are DC220V 3A, the closing time is less than 0.1ms, and the closing time is less than 0.9ms, which meets the requirements of fast DC control.

[0056] In summary, the present invention provides a fast DC control method that takes into account both safety and reliability, solves the problem of erroneous power-off or untimely power-off in the prior art, and realizes more flexible and safe DC control by combining voltage detection and lock signal judgment. The power-off action is triggered only when the voltage value exceeds the preset value and the lock signal is in the open state (that is, there is no external forced power supply demand). This logical combination avoids erroneous power-off at critical moments and improves the reliability of the system.

[0057] Example 3

[0058] This embodiment provides a fast DC control method. In order to verify the effectiveness of the present invention, we designed a series of experiments.

[0059] First, build a simulated DC circuit, which includes a DC power supply, an analog-to-digital converter ADC, two solid-state relays KM1 and KM2, a microcontroller, and necessary connecting wires and interfaces. The DC power supply provides 220V DC voltage, and the analog-to-digital converter is used to convert the voltage signal into a digital signal for processing by the microcontroller.

[0060] In the experiment, different voltage values ​​and blocking signal states were simulated to test the response of the control method. The microcontroller was programmed to monitor the output of the ADC and compare the voltage value with the preset 110V threshold. At the same time, the microcontroller also monitors the state of the blocking signal. When the voltage value is detected to exceed 110V and the blocking signal is in the open state, the microcontroller will output a trigger signal to KM1 and KM2 to disconnect the DC loop power supply.

[0061] In order to simulate different working scenarios, six different test conditions were set, including different voltage values ​​and blocking signal states. Under each condition, the response time of KM1 and KM2, as well as the disconnection and recovery time of the circuit were recorded. The specific experimental data are shown in Table 1.

[0062] Table 1

[0063]

[0064] By analyzing the data in the above table, we can draw the following conclusions:

[0065] Response time: The closing and opening times of KM1 and KM2 meet the technical requirements, that is, the closing time of KM1 is less than 0.1ms, and the closing time of KM2 is less than 0.9ms. This shows that the control method can quickly respond to changes in voltage and blocking signals.

[0066] Circuit disconnection and restoration time: The circuit disconnection time is between 0.09ms and 0.17ms, while the restoration time is between 0.75ms and 0.95ms. These data show the high efficiency of the control method in disconnecting and restoring the DC link power.

[0067] Influence of voltage value and blocking signal status: When the DC voltage value exceeds the preset 110V and the blocking signal is in the open state, the circuit can be quickly disconnected, which proves the effectiveness of the control method. When the voltage value is lower than 110V or the blocking signal is in the closed state, the circuit remains powered, showing that the control method can maintain the normal working state of the circuit according to actual needs.

[0068] Compared with the existing technology: Compared with the traditional DC control method, the control method of the present invention has obvious advantages in response time and circuit disconnection recovery time. The traditional control loop relies on mechanical protection devices such as air switches, which only cut off the power supply in the event of a serious fault such as a short circuit, increasing the risk of equipment damage. The method of the present invention significantly improves the safety and reliability of the circuit through rapid response.

[0069] Example 4

[0070] Reference Figure 2-Figure 3 , which is the fourth embodiment of the present invention, provides a fast DC control system, including an acquisition module 200 for real-time monitoring of the state of the DC circuit 100, and a control module 300 for controlling the opening and closing of the DC circuit 100 by receiving the state information output by the acquisition module 100.

[0071] Specifically, the DC circuit 100 , the acquisition module 200 and the control module 300 , the control module 200 controls the opening and closing of the DC circuit 300 by detecting the voltage value signal and the locking signal output by the acquisition module 100 .

[0072] Specifically, the DC circuit 100 is provided with a trip holding relay TBJ and an electromagnetic trip coil TQ. The trip holding relay TBJ is connected to the positive power supply through the normally open contact TBJ, and the other end is connected to the electromagnetic trip coil TQ through the auxiliary contact DL, and the other end of the electromagnetic trip coil TQ is also connected to the negative power supply through the second solid-state relay KM2; the two ends of the normally open contact TBJ are connected in parallel with a protective pressure plate 101, and the two ends of the normally open contact TBJ are also connected in parallel with a manual operating relay contact ST.

[0073] Specifically, the acquisition module 200 is provided with a monitoring relay HWJ and an analog-to-digital converter DC. One end of the monitoring relay HWJ is connected to the control loop of the circuit breaker tripping coil TQ, and the other end is connected to the positive power supply. The analog-to-digital converter DC respectively collects the voltage values ​​of the positive power supply and the negative power supply, and outputs the collected DC voltage values ​​to the comparator U3.

[0074] Preferably, the monitoring relay HWJ is used to monitor the closing state of the circuit breaker.

[0075] Under normal conditions, the circuit breaker is in the closed position, the auxiliary contact DL is in the closed state, the electromagnetic trip coil TQ is negatively charged, and the node 37 is negatively charged. Because the protection action or manual operation relay contact ST is positively charged, the normally open contacts of the trip holding relay TBJ are self-closed, and the current flow direction is "positive power supply + KM → TBJ contact → trip holding relay TBJ → auxiliary contact DL → electromagnetic trip coil TQ → negative power supply - KM2". After the electromagnetic trip coil TQ is energized, it excites and drives the armature to move. After a certain stroke, the armature transfers mechanical energy to the mechanical transmission device of the circuit breaker to realize the mechanical action tripping of the circuit breaker.

[0076] The system power supply is normal, the circuit breaker is closed and running, node 37 is negatively charged, and the real-time voltage Vd is monitored between the positive power supply +KM and node 37. It is compared with the set voltage Vset after analog-to-digital conversion. When the input voltage Vd is less than Vset and the lock is opened, the DC220V input prohibition gate circuit does not operate. After the AND gate circuit determines that the conditions are met, the comparator U3 outputs a command to control the second solid-state relay KM2 to disconnect, so as to disconnect the power supply of the electromagnetic trip coil TQ, cancel the magnetic field establishment process of the electromagnetic trip coil TQ, and the armature in the coil of the electromagnetic trip coil TQ no longer continues to transmit mechanical energy to the mechanical transmission device of the circuit breaker, and the circuit breaker no longer trips.

[0077] It should be noted that the electromagnetic tripping coil TQ coil has a fastest action time of about 15mS from powering up, establishing a magnetic field to driving the armature to act. The present invention uses a comparator U3 with an action time of about 1mS, and an oscilloscope is used to measure the time from voltage acquisition, program judgment to the second solid-state relay KM2, which is about 1.2mS. The action time of the second solid-state relay KM2 flipping is much shorter than the armature action time of the electromagnetic tripping coil TQ, thereby achieving the tripping energy isolation of the circuit breaker.

[0078] Example 5

[0079] Reference Figure 2-Figure 4 , which is the fifth embodiment of the present invention, provides a fast DC control system, including a control module 300 that controls the opening and closing of a loop through a comparator U3.

[0080] Specifically, the control module 300 includes a comparator U3, which is connected to the first chip U2 through pin D1 and to the second chip U4 through pin D2; the comparator U3 judges the voltage value signal and performs analog-to-digital conversion through pin A0+ and pin A0- through a differential input method; the control module 300 also includes a third chip U7 that receives the voltage value signal and the locking signal. The comparator U3 is connected to the third chip U7 through pin KAIRU / DIN and pin KAIRU, and judges the locking signal state.

[0081] Specifically, the control module 300 is further provided with a backup relay U1 connected to the pin D0 VAC of the comparator U3 and a voltage regulator U8 providing a 5V power supply.

[0082] Preferably, the comparator U3 uses an independent 220V DC power supply, which outputs a DC 5V voltage through the voltage regulator U8 and provides it to the comparator U3. The voltage regulator U8 divides the voltage and outputs a 3.3V DC power supply to drive the first chip U2 and the second chip U4. The first chip U2 and the second chip U4 trigger the flip voltage using 3-3V. The power supply also serves as a DC220V input power supply to determine the external locking condition.

[0083] It should be noted that the first solid-state relay KM1 is triggered to flip its state through the first chip U2, and the second solid-state relay KM2 is triggered to flip its state through the second chip U4.

[0084] It should be noted that the comparator U3 can change the normally open or normally closed properties of the first solid-state relay KM1 and the second solid-state relay KM2 through programming, and can also set both of them as normally closed nodes at the same time.

[0085] It should be noted that the pins A0+ and A0- of the comparator U3 are also provided with a plurality of voltage-dividing resistors, whose resistance values ​​are respectively 300KΩ resistor, 47KΩ resistor and 5KΩ resistor (two 10KΩ resistors in parallel). The DC collected voltage Vd is divided by connecting a plurality of voltage-dividing resistors in series and then analog-to-digital conversion is performed to realize real-time voltage monitoring of the monitored circuit.

[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fast DC control method, characterized in that: include, Detecting the DC conversion voltage value signal and the state of the blocking signal in the DC circuit; Determine whether the voltage value signal and the blocking signal status meet the requirements for disconnecting the circuit power supply; Control the on and off of the relay in the DC circuit when the requirements for disconnecting the circuit power are met.

2. The fast DC control method according to claim 1, characterized in that: The DC conversion voltage value signal is a digital signal obtained by converting the DC voltage signal through an analog-to-digital converter, and the DC conversion voltage value signal is detected in real time through a differential input method.

3. The fast DC control method according to claim 2, characterized in that: The blocking signal in the DC circuit is a DC power supply input signal, and the state of the blocking signal in the DC circuit is detected by a microcontroller.

4. The fast DC control method according to claim 3, characterized in that: The logic for judging whether the voltage value signal and the locking signal state meet the requirement of disconnecting the loop power supply is: If the voltage value detected by the comparator is less than the preset voltage value and the blocking signal is in the on state, the DC circuit meets the requirement of disconnecting the circuit power supply, then the flipping action of the two sets of solid-state relays is triggered, the DC circuit power supply is cut off and an action signal is issued; If the comparator detects a voltage value greater than a preset voltage value or an external blocking signal is present, the DC circuit is powered.

5. The fast DC control method according to claim 4, characterized in that: When the requirement for disconnecting the loop power supply is met, the microcontroller outputs a trigger signal for disconnecting the DC loop power supply, the first solid-state relay KM1 closes and sends out an alarm signal, and the second solid-state relay KM2 disconnects the DC loop.

6. A fast DC control system, based on the fast DC control method according to any one of claims 1 to 5, characterized in that: A direct current circuit (100), a collection module (200) and a control module (300), wherein the control module (200) controls the opening and closing of the direct current circuit (300) by detecting a voltage value signal and a locking signal output by the collection module (100).

7. The fast DC control system according to claim 6, characterized in that: The DC circuit (100) is provided with a trip holding relay (TBJ) and an electromagnetic trip coil (TQ); the trip holding relay (TBJ) is connected to a positive power supply via a normally open contact TBJ, and the other end is connected to the electromagnetic trip coil (TQ) via an auxiliary contact DL, and the other end of the electromagnetic trip coil (TQ) is also connected to a negative power supply via a second solid-state relay KM2; The two ends of the normally open contact TBJ are connected in parallel with a protection pressure plate (101), and the two ends of the normally open contact TBJ are also connected in parallel with a manual operating relay contact (ST).

8. The fast DC control system according to claim 7, characterized in that: The acquisition module (200) is provided with a monitoring relay (HWJ) and an analog-to-digital converter (DC); one end of the monitoring relay (HWJ) is connected to a control circuit of a circuit breaker tripping coil (TQ), and the other end is connected to a positive power supply; the analog-to-digital converter (DC) respectively acquires voltage values ​​of the positive power supply and the negative power supply, and outputs the acquired DC voltage value to a comparator (U3).

9. The fast DC control system according to claim 8, characterized in that: The control module (300) comprises a comparator (U3), wherein the comparator (U3) is connected to the first chip (U2) via a pin D1 and is connected to the second chip (U4) via a pin D2; The comparator (U3) determines the voltage value signal and performs analog-to-digital conversion through the pin A0+ and the pin A0- in a differential input mode; The control module (300) further comprises a third chip (U7) for receiving a voltage value signal and a locking signal. The comparator (U3) is connected to the third chip (U7) via pins KAIRU / DIN and KAIRU, and determines the state of the locking signal.

10. The fast DC control system according to claim 9, characterized in that: The control module (300) is also provided with a backup relay (U1) connected to the pin D0 VAC of the comparator (U3) and a voltage regulator (U8) for providing a 5V power supply.

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