Multifunctional power supply voltage conditioning and monitoring circuit

Abstract

The invention belongs to the field of system monitoring and signal communication, and discloses a multifunctional power supply voltage conditioning and monitoring circuit, which comprises a filtering amplitude-stabilizing circuit, a power supply circuit and a transmission control circuit, and is characterized in that the filtering amplitude-stabilizing circuit is connected with a power supply to be monitored and the power supply circuit; the output end of the power supply circuit is connected with the input end of the transmission control circuit and the input end of the ARM core processing controller, the output end of the ARM core processing controller is connected with the input end of the transmission control circuit, and the output end of the transmission control circuit is connected with the user side. The filtering amplitude-stabilizing circuit is used for monitoring, filtering and stabilizing the voltage output by the power supply to be monitored and outputting working voltage to each circuit at the rear stage, and the transmission control circuit is used for controlling whether to output power supply voltage to a user side or not according to a control signal output by the ARM core processing controller. The circuit provided by the invention can be applied to state monitoring of abnormal conditions such as overvoltage, undervoltage, amplitude ripple and the like of one or more paths of power supply voltages and control of voltage transmission.

Description

Technical Field

[0001] The invention belongs to the field of system monitoring and signal communication, and relates to a multifunctional power supply voltage conditioning monitoring circuit. Background Art

[0002] The system monitoring and signal communication industry has an important position and broad development prospects in today's digital and information era. With the continuous advancement of technology, various industries have an increasing demand for efficient, stable, and real-time system monitoring and reliable signal communication. Advanced monitoring technology and communication methods are needed in the fields of industry, transportation, energy, and medical care to achieve efficient information capture and processing. They play a key role in promoting the development of various fields, improving production efficiency, and ensuring public safety, and will continue to maintain a rapid development trend in the future. At present, the power supply voltage has the problem of not being able to remain stable when the amplitude changes suddenly with the load of the front or back stage. In terms of stability, if the power supply voltage fluctuates greatly with the load, it will inevitably affect the output capacity of the product, and the load efficiency will be significantly reduced, which will directly cause the failure of some functions; in terms of monitoring, if the power supply voltage is affected by ripples, instantaneous over- and under-voltage phenomena occur, and the power supply system fails to cut off the abnormal input in time, it will also cause irreversible effects on the later components.

[0003] The state, i.e. stability, of the power supply voltage plays a role in protecting the stability of the subsequent equipment and ensuring safe operation. Therefore, it is necessary to design a circuit that can regulate and monitor the power supply voltage. Summary of the invention

[0004] In order to solve the technical problems of poor stability and difficulty in monitoring of existing power supply voltage, the present invention discloses a multifunctional power supply voltage conditioning and monitoring circuit, wherein the voltage conditioning and monitoring circuit comprises a filtering and amplitude stabilization circuit, a power supply circuit and a transmission control circuit.

[0005] Among them, the input end of the filtering and amplitude stabilization circuit is connected to the power supply to be monitored, and the output end is connected to the input end of the power supply circuit. The output end of the power supply circuit is respectively connected to the input ends of the transmission control circuit and the ARM core processing controller, the output end of the ARM core processing controller is connected to the input end of the transmission control circuit, and the output end of the transmission control circuit is connected to the user end.

[0006] The filtering and stabilizing circuit monitors and filters the voltage output by the power supply to be monitored, and outputs the working voltage to each subsequent circuit. The transmission control circuit controls whether to output the power supply voltage to the user end according to the control signal output by the ARM core processing controller.

[0007] Furthermore, the filtering and amplitude stabilization circuit includes a filter F1 and a DC / DC converter U1, the input end of the filter F1 is connected to the output end of the power supply to be monitored, and the output end is connected to the input end of the DC / DC converter U1; a differential film capacitor is connected between the positive output end and the negative output end of the power supply to be monitored, a filter capacitor is connected between the positive output end and the negative output end of the filter F1, a freewheeling diode D3 is connected to the positive output end of the DC / DC converter U1, and the output end of the freewheeling diode D3 is connected to the power supply circuit.

[0008] Furthermore, the filtering and amplitude stabilization circuit further includes a rectifier diode D1 located between the positive output terminal of the power supply to be monitored and the filter F1.

[0009] Furthermore, there are multiple transmission control circuits, and the output end of each transmission control circuit is connected to a user end respectively.

[0010] Further, the transmission control circuit includes a relay and a field effect tube, the gate of the field effect tube is connected to the output end of the ARM core processing controller via a CTRL line, the source is connected to the relay, and the drain of the field effect tube is grounded;

[0011] The first input terminal of the relay is connected to the output end of the ARM core processing controller via a CTRL BACK circuit, the second input terminal of the relay is connected to the output end of the power supply circuit, and the output terminal of the relay is connected to the user end; a diode is connected in parallel between the positive and negative poles of the colored insulating terminal of the relay.

[0012] Furthermore, the transmission control circuit also includes a voltage-stabilizing diode, one end of which is connected to the gate of the field effect transistor, and the other end of which is grounded.

[0013] In an improved embodiment of the above-mentioned multifunctional power supply voltage conditioning and monitoring circuit, the voltage conditioning and monitoring circuit also includes a conditioning sampling circuit, the input end of the conditioning sampling circuit is connected to the output end of the power supply to be monitored and the output end of the power supply circuit, the output end is connected to the ARM core processing controller, and the conditioning sampling circuit performs voltage division processing on the voltage output by the power supply to be monitored.

[0014] In an improved embodiment of the above-mentioned multifunctional power supply voltage conditioning and monitoring circuit, the conditioning sampling circuit includes an adjustable potentiometer, a transient voltage suppression diode TVS, an isolated operational amplifier follower, a first clamping diode and a second clamping diode, the input end of the adjustable potentiometer is connected to the power supply to be monitored, and the output end is connected to the positive terminal of the isolated operational amplifier follower.

[0015] The negative terminal of the isolation operational amplifier follower and its output terminal are connected to the ARM core processing controller, one end of the transient voltage suppression diode TVS is connected to the positive terminal of the isolation operational amplifier follower, and the other end is grounded.

[0016] One end of the first clamping diode and the second clamping diode are both connected to the output end of the isolation operational amplifier follower, the other end of the first clamping diode is connected to the power supply circuit, and the other end of the second clamping diode is grounded.

[0017] In an improved embodiment of the above-mentioned multifunctional power supply voltage conditioning and monitoring circuit, the voltage conditioning and monitoring circuit also includes a state storage circuit, which is connected to the ARM core processing controller, and the state storage circuit stores the power supply voltage state output by the ARM core processing controller to the user end.

[0018] In an improved embodiment of the above-mentioned multifunctional power supply voltage conditioning and monitoring circuit, the voltage conditioning and monitoring circuit also includes a communication circuit located between the ARM core processing controller and the user end, and the input end of the communication circuit is connected to the output end of the power supply circuit.

[0019] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification include at least: the voltage conditioning monitoring circuit of the present invention can be used to monitor the status of abnormal conditions such as overvoltage, undervoltage, amplitude ripple, etc. of one or more power supply voltages and control the transmission of voltage. Through the orderly interconnection between the module circuits through the MCU processing controller, the functions of each other can be realized. At the same time, the voltage conditioning monitoring circuit can use RS429 for communication, which has the characteristics of high reliability, moderate data transmission rate, high degree of standardization, and wide application range. It has strong anti-interference ability and fault tolerance, can work stably in complex electromagnetic environments, and can meet the requirements of many avionics systems for data transmission speed. It is often used in aerospace and other fields with high communication requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 It is a principle block diagram of a multifunctional power supply voltage conditioning and monitoring circuit disclosed in an embodiment of the present invention;

[0022] Figure 2A schematic diagram of a filtering and amplitude stabilization circuit disclosed in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a power supply circuit disclosed in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of a transmission control circuit disclosed in an embodiment of the present invention;

[0025] Figure 5 The conditioning sampling circuit disclosed in the embodiment of the present invention is intended;

[0026] Figure 6 A schematic diagram of a state storage circuit disclosed in an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of a communication circuit disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0030] The embodiment of the present invention discloses a multifunctional power supply voltage conditioning monitoring circuit. Figure 1 As shown, the voltage conditioning and monitoring circuit includes a filtering and amplitude stabilization circuit, a power supply circuit and a transmission control circuit.

[0031] Among them, the input end of the filtering and amplitude stabilization circuit is connected to the power supply to be monitored, and the output end is connected to the input end of the power supply circuit. The output end of the power supply circuit is respectively connected to the input ends of the transmission control circuit and the ARM core processing controller, the output end of the ARM core processing controller is connected to the input end of the transmission control circuit, and the output end of the transmission control circuit is connected to the user end.

[0032] The filtering and stabilizing circuit monitors and filters the voltage output by the power supply to be monitored, and outputs the working voltage to each subsequent circuit. The transmission control circuit controls whether to output the power supply voltage to the user end according to the control signal output by the ARM core processing controller.

[0033] The voltage conditioning monitoring circuit of the present invention can simultaneously monitor the status of multiple power supplies to be monitored and control the transmission of voltage. Specifically, the filtering and amplitude stabilization circuit can perform ripple filtering on the initial power supply voltage output by one or more power supplies to be monitored, and can also reconvert the amplitude voltage of overvoltage and undervoltage into the voltage to be provided to the subsequent stage (i.e., the user end or other circuit modules in the voltage conditioning monitoring circuit). The power supply circuit can obtain a 12V power supply and a 3.3V power supply with a stable amplitude to provide corresponding power supplies for each module circuit of the subsequent stage. The transmission control circuit can control the actual connection between the input power supply voltage and the upper architecture circuit. When the processor determines that the amplitude of the power supply voltage is stable, it outputs the corresponding level instruction to control the switch tube, thereby controlling the electromagnetic relay to be attracted to complete the transmission of the power supply voltage.

[0034] The ARM core processing controller and its peripheral circuits mainly include external crystal oscillator circuits, decoupling circuits and software upload circuits in addition to the above circuits. Through the central processing of the processor, the various module circuits cooperate with each other to realize the many functions of the power supply voltage conditioning and monitoring circuit.

[0035] In one feasible embodiment of the filtering and amplitude stabilization circuit, see Figure 2 As shown, the filtering and amplitude stabilization circuit includes a filter F1 and a DC / DC converter U1, the input end of the filter F1 is connected to the output end of the power supply to be monitored, and the output end is connected to the input end of the DC / DC converter U1; a differential film capacitor C1 / C2 is connected between the positive output end and the negative output end of the power supply to be monitored, a filter capacitor C3 / C4 / C5 is connected between the positive output end and the negative output end of the filter F1, a freewheeling diode D3 is connected to the positive output end of the DC / DC converter U1, and the output end of the freewheeling diode D3 is connected to the power supply circuit.

[0036] In specific implementation, the filtering and amplitude stabilization circuit performs ripple filtering on the initial supply voltage output by the monitored power supply, see Figure 2 As shown, C1 and C2 are differential film capacitors, generally uF-level ceramic capacitors are selected, and two differential film capacitors are respectively set on a power supply to be monitored, and are connected across the positive input terminal and the negative input terminal of the power line of the power supply to be monitored, and play a filtering role on the differential film interference in the input voltage. It should be noted here that the number of differential film capacitors can be determined according to the number of power supplies to be monitored in the entire circuit. For example, if the number of power supplies to be monitored is N, there are also N corresponding differential film capacitors.

[0037] See also Figure 2 As shown, filter F1 is used to stabilize the voltage amplitude and improve the electromagnetic compatibility performance of the circuit. The input end of filter F1 is connected to the power supply to be monitored, and the output end is connected to DC / DC converter U1. DC / DC converter U1 is a linear LDO, which can reconvert the overvoltage and undervoltage amplitude voltage into the voltage to be provided to the subsequent stage. There are multiple filter capacitors connected between the positive output and negative output ends of filter F1, such as Figure 2 The three parallel filter capacitors C3, C4, and C5 shown in the figure are recommended to be high-voltage filter capacitors with a capacitance of 150uF to 250uF.

[0038] Among them, the filter and amplitude stabilization circuit is also equipped with a resistor R1, a freewheeling diode D3 and a capacitor CL1, which are specially designed for the power supply compatibility characteristics of the system. They are used in conjunction with the DC / DC converter U1, the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 to improve the compatibility of the entire circuit when facing an unstable amplitude power supply voltage. The resistor R1 needs to be a high-power resistor in the kilo-ohm range, and the rated current of the freewheeling diode D3 and the rated withstand voltage of the capacitor CL1 need to leave a margin. This circuit can be used to monitor the status of abnormal conditions such as overvoltage, undervoltage, amplitude ripple, etc. of one or more power supply voltages and control the transmission of voltage.

[0039] In an achievable improved embodiment of the filtering and amplitude stabilization circuit, see Figure 2 As shown, the filtering and amplitude stabilization circuit also includes a rectifier diode D1 located between the positive output terminal of the power supply to be monitored and the filter F1. The positive input terminals of the two power supplies to be monitored are respectively provided with a rectifier diode D1 / D2. The rectifier diodes D1 / D2 can be selected in combination with the actual rated amplitude of the power supply voltage and the working current, and their unidirectional conductivity is used for anti-reverse. It should be noted here that the number of rectifier diodes can be determined according to the number of power supplies to be monitored in the entire circuit. For example, when the number of power supplies to be monitored is N, the number of corresponding rectifier diodes is also N.

[0040] In one possible embodiment of the power supply circuit, see Figure 3 As shown, the input end of the power supply circuit is connected to the filtering and stabilizing circuit, and the power supply voltage output by the filtering and stabilizing circuit is processed through the DC / DC converter U2 and the DC / DC converter U3, the resistors R3~R7, and the capacitors C6~C19, and then a 12V or 3.3V voltage is output to the subsequent circuit.

[0041] In one possible embodiment of the transmission control circuit, see Figure 4As shown, there are multiple transmission control circuits, and the output end of each transmission control circuit is connected to a user end. The voltage conditioning monitoring circuit of the present invention can simultaneously monitor the status of multiple power supplies to be monitored and control the transmission of voltage.

[0042] In one possible embodiment of the transmission control circuit, see Figure 4 As shown, the transmission control circuit includes a relay D8 and a field effect transistor Q1, the gate of the field effect transistor Q1 is connected to the output end of the ARM core processing controller via a CTRL line, the source is connected to the relay D8, and the drain of the field effect transistor Q1 is grounded; the first input terminal 6 of the relay D8 is connected to the output end of the ARM core processing controller via a CTRL BACK line, the second input terminal 2 of the relay D8 is connected to the output end of the power supply circuit, and the output terminal of the relay D8 is connected to the user end; a freewheeling diode D8 is connected in parallel between the positive and negative electrodes of the colored insulating terminal of the relay D8.

[0043] In specific implementation, the transmission control circuit is connected to the output end of the ARM core processing controller, and the control signal of the ARM processing controller is converted into a signal for controlling the relay to be attracted or disconnected, thereby controlling the output or interruption of the VO voltage output by the power supply circuit. Among them, in the transmission control circuit corresponding to a power supply to be monitored, the resistor R26 is used to match the impedance of the CTRL BACK line, and usually a resistor with the same resistance value of tens to 100Ω is selected. The resistors R27 and R28 control the gate voltage of the field effect tube Q1 within the turn-on voltage range through voltage division, so the resistance selection of R27 and R28 depends on the turn-on voltage of the field effect tube Q1; the capacitor C43 and the voltage regulator diode ZD2 are used to stabilize the amplitude of the CTRL line signal, the capacitance of C43 is selected at the uF level, and the voltage regulator amplitude of the voltage regulator diode ZD1 is 5.1V.

[0044] The operating principle of the transmission control circuit is: when the CTRL line outputs a high level, the gate source of the field effect tube Q1 is turned on, and the drain source is turned on, thereby controlling the relay to be attracted, and the freewheeling diode D8 connected in parallel between the positive and negative electrodes of the relay colored insulation terminal plays a freewheeling role, and the two sets of terminals of the relay are switched from the normally closed point to the open point (i.e. Figure 4As shown in the figure, terminal 2 is switched from being closed with terminal 4 to being closed with terminal 5, and terminal 6 is switched from being closed with terminal 8 to being closed with terminal 1). At this time, the VO voltage is output to the subsequent user-end circuit, and the normally closed feedback signal (3.3V pull-up voltage) of the CTRL BACK line is connected to the ground return line through terminal 1 at this time. The feedback signal is converted from a high level to a low level, and the processing controller determines that the VO voltage has been output to the next level; when the CTRL line outputs a low level, the gate source of the field effect transistor Q1 is closed, the signal controlling the relay to be attracted disappears, and the switches are switched from the current state to the normally closed point. The VO voltage is no longer output to the subsequent circuit, and at the same time, the normally closed feedback signal (3.3V pull-up voltage) of the CTRL BACK line takes effect again, and the processing controller determines that the VO voltage stops being output.

[0045] It should be noted here that Figure 4 The resistors R30, R31, R32, R29, field effect transistor Q2, capacitor C44, freewheeling diodes D10 and D11 in the brackets are all components of the transmission control circuit corresponding to another monitoring power supply.

[0046] In an achievable improved embodiment of the transmission control circuit, see Figure 4 As shown, the transmission control circuit further includes a voltage stabilizing diode ZD2, one end of the voltage stabilizing diode ZD2 is connected to the gate of the field effect transistor Q1, and the other end is grounded.

[0047] In an improved embodiment of the above multifunctional power supply voltage conditioning monitoring circuit, see Figure 1 As shown, the voltage conditioning monitoring circuit also includes a conditioning sampling circuit, the input end of the conditioning sampling circuit is connected to the output end of the power supply to be monitored and the output end of the power supply circuit, and the output end is connected to the ARM core processing controller, and the conditioning sampling circuit performs voltage division processing on the voltage output by the power supply to be monitored. The input voltage can be conditioned by setting the conditioning sampling circuit, and the conditioned voltage will be limited to a fixed amplitude. After being processed by the isolation operational amplifier, the voltage is sent to the processor, and the software can be used to determine whether the input power supply voltage is stable within the specified range.

[0048] In an improved embodiment of the above multifunctional power supply voltage conditioning monitoring circuit, see Figure 5As shown, the conditioning sampling circuit includes an adjustable potentiometer, a transient voltage suppression diode TVS, an isolated operational amplifier follower IC3, a first clamping diode and a second clamping diode. The input end of the adjustable potentiometer is connected to the power supply to be monitored, and the output end is connected to the positive end of the isolated operational amplifier follower IC3. The negative end and the output end of the isolated operational amplifier follower IC3 are connected to the ARM core processing controller, one end of the transient voltage suppression diode TVS is connected to the positive end of the isolated operational amplifier follower IC3, and the other end is grounded. One end of the first clamping diode and the second clamping diode are both connected to the output end of the isolated operational amplifier follower IC3, the other end of the first clamping diode is connected to the power supply circuit, and the other end of the second clamping diode is grounded.

[0049] For specific implementation, see Figure 5 As shown, R11 and R12 are voltage-dividing resistors, W1 is an adjustable potentiometer, which corresponds to one power supply to be monitored; R14 and R15 are voltage-dividing resistors, W2 is an adjustable potentiometer, which corresponds to another power supply to be monitored. The voltage-dividing resistors and the adjustable potentiometer realize the conditioning and voltage division of the input power supply voltage by matching the resistance values. It should be noted that R11, R12, R14, and R15 need to be selected with resistors of appropriate resistance values ​​and with a withstand voltage higher than the sampling voltage value to avoid damage to the sampling resistor when the sampling voltage amplitude overshoots; TVS is a transient voltage suppression diode (including TVS2 and TVS3, corresponding to different power supplies to be monitored), which is used to protect the circuit from fatal damage when the power supply voltage amplitude overshoots. The capacity selection of TVS2 and TVS3 also depends on the amplitude of the sampled voltage. The voltage after the conditioning sampling circuit will be limited to a fixed amplitude. After being processed by the isolation operational amplifier follower IC3 (including IC3A and IC3B, corresponding to different power supplies to be monitored), the voltage is sent to the processor. The software can be used to determine whether the input power supply voltage is stable within the specified range. Among them, D4, D5, D6, and D7 are all clamping diodes, among which D4 and D6 are the first clamping diodes, and D5 and D7 are the second clamping diodes. If the conditioned voltage amplitude is not between 0 and 3.3V, the port voltage will be clamped to 3.3V to ensure that the signal amplitude given to the processor will not damage the processor. The matching resistors R13 and R16 usually use the same resistance, ranging from tens to one hundred ohms, to ensure the consistency of the matching impedance of multi-channel signal inputs, which greatly improves the reliability of the conditioning sampling results.

[0050] In an improved embodiment of the above multifunctional power supply voltage conditioning monitoring circuit, see Figure 1As shown, the voltage conditioning monitoring circuit also includes a state storage circuit, which is connected to the ARM core processing controller, and stores the power supply voltage state output by the ARM core processing controller to the user end.

[0051] In an improved embodiment of the above multifunctional power supply voltage conditioning monitoring circuit, see Figure 1 As shown, the voltage conditioning monitoring circuit also includes a circuit located between the ARM core processing controller and the user end. Figure 7 In the communication circuit shown, the input end of the communication circuit is connected to the output end of the power supply circuit.

[0052] By setting the state storage circuit and the communication circuit, the power supply voltage state within a period of time can be stored so that the relevant information can be called when needed. The call of the stored information can be carried out through the ARI NC429 communication circuit and communicate with the upper architecture circuit according to the agreed protocol. The communication content comes from the state storage circuit.

[0053] In the specific implementation, see Figure 6 As shown, the state storage circuit is connected to the input and output terminals of the ARM core processing controller to store the power supply voltage status within a period of time so that the relevant information can be called when needed. The status information of the two power supplies to be monitored is stored in the programmable registers IC6 and IC7 respectively, and the pull-up resistors R23 and R24 are used as high-level signal compensation when the information is called. When the upper-layer architecture circuit of the system is connected through the communication circuit (such as Figure 7 When the status information of the power supply voltage is called (as shown), it can be output bit by bit, where TVS4~TVS9 are transient suppression diodes that ensure the stability of the communication signal amplitude and protect the RS429 communication chip from being damaged by external overshoot signals.

[0054] The voltage conditioning monitoring circuit of the present invention can be applied to monitor the state of abnormal conditions such as overvoltage, undervoltage, amplitude ripple, etc. of one or more power supply voltages and control the transmission of voltage. Through the orderly cross-linking of each module circuit through the MCU processing controller, the functions of each other can be realized. At the same time, the voltage conditioning monitoring circuit can use RS429 for communication, which has the characteristics of high reliability, moderate data transmission rate, high degree of standardization, and wide application range. It has strong anti-interference ability and fault tolerance, can work stably in complex electromagnetic environments, can meet the requirements of many avionics systems for data transmission speed, and is often used in fields such as aerospace that have high communication requirements.

[0055] Obviously, those skilled in the art should understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multifunctional power supply voltage conditioning and monitoring circuit, characterized in that: The voltage conditioning monitoring circuit includes a filtering and amplitude stabilization circuit, a power supply circuit and a transmission control circuit. The input end of the filtering and amplitude stabilization circuit is connected to the power supply to be monitored, and the output end is connected to the input end of the power supply circuit. The output end of the power supply circuit is respectively connected to the input end of the transmission control circuit and the ARM core processing controller. The output end of the ARM core processing controller is connected to the input end of the transmission control circuit, and the output end of the transmission control circuit is connected to the user end. The filtering and stabilizing circuit monitors and filters the voltage output by the power supply to be monitored, and outputs the working voltage to each subsequent circuit. The transmission control circuit controls whether to output the power supply voltage to the user end according to the control signal output by the ARM core processing controller.

2. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 1, characterized in that: The filtering and amplitude stabilization circuit includes a filter F1 and a DC / DC converter U1, the input end of the filter F1 is connected to the output end of the power supply to be monitored, and the output end is connected to the input end of the DC / DC converter U1; a differential film capacitor is connected between the positive output end and the negative output end of the power supply to be monitored, a filter capacitor is connected between the positive output end and the negative output end of the filter F1, a freewheeling diode D3 is connected to the positive output end of the DC / DC converter U1, and the output end of the freewheeling diode D3 is connected to the power supply circuit.

3. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 2, characterized in that: The filtering and amplitude stabilization circuit further includes a rectifier diode D1 located between the positive output terminal of the power supply to be monitored and the filter F1.

4. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 1, characterized in that: There are multiple transmission control circuits, and the output end of each transmission control circuit is connected to a user end respectively.

5. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 1, characterized in that: The transmission control circuit comprises a relay and a field effect tube, the gate of the field effect tube is connected to the output end of the ARM core processing controller via a CTRL line, the source is connected to the relay, and the drain of the field effect tube is grounded; The first input terminal of the relay is connected to the output end of the ARM core processing controller via a CTRL BACK circuit, the second input terminal of the relay is connected to the output end of the power supply circuit, and the output terminal of the relay is connected to the user end; a diode is connected in parallel between the positive and negative poles of the colored insulating terminal of the relay.

6. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 5, characterized in that: The transmission control circuit also includes a voltage stabilizing diode, one end of which is connected to the gate of the field effect tube, and the other end of which is grounded.

7. The multifunctional power supply voltage conditioning and monitoring circuit according to any one of claims 1 to 6, characterized in that: The voltage conditioning monitoring circuit also includes a conditioning sampling circuit, the input end of the conditioning sampling circuit is connected to the output end of the power supply to be monitored and the output end of the power supply circuit, and the output end is connected to the ARM core processing controller. The conditioning sampling circuit performs voltage division processing on the voltage output by the power supply to be monitored.

8. The multifunctional power supply voltage conditioning and monitoring circuit according to claim 7, characterized in that: The conditioning sampling circuit comprises an adjustable potentiometer, a transient voltage suppression diode, an isolation operational amplifier follower, a first clamping diode and a second clamping diode, the input end of the adjustable potentiometer is connected to the power supply to be monitored, and the output end is connected to the positive terminal of the isolation operational amplifier follower; The negative terminal of the isolated operational amplifier follower and its output terminal are connected to the ARM core processing controller, one end of the transient voltage suppression diode is connected to the positive terminal of the isolated operational amplifier follower, and the other end is grounded; One end of the first clamping diode and the second clamping diode are both connected to the output end of the isolation operational amplifier follower, the other end of the first clamping diode is connected to the power supply circuit, and the other end of the second clamping diode is grounded.

9. The multifunctional power supply voltage conditioning and monitoring circuit according to any one of claims 1 to 6, characterized in that: The voltage conditioning monitoring circuit also includes a state storage circuit, which is connected to the ARM core processing controller and stores the power supply voltage state output by the ARM core processing controller to the user end.

10. The multifunctional power supply voltage conditioning and monitoring circuit according to any one of claims 1 to 6, characterized in that: The voltage conditioning monitoring circuit also includes a communication circuit located between the ARM core processing controller and the user end, and the input end of the communication circuit is connected to the output end of the power supply circuit.

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