Multipath digital quantity input signal acquisition module circuit

Abstract

The invention discloses a multipath digital quantity input signal acquisition module circuit, relates to a fire detection system, and aims to solve the problems that a signal input and output circuit of an existing acquisition module is easily interfered by an external circuit and is poor in reliability. According to the invention, a power conversion circuit converts 220V alternating current into power supply voltage of an MCU control circuit and working voltage of a signal input circuit; the signal input circuit is used for acquiring a module switch key state and detector alarm information and outputting an acquisition signal; the signal input circuit is provided with multiple paths of input and output signals, and each path of input and output signals work independently; and the MCU control circuit is used for receiving the acquisition signal output by the signal input circuit and controlling power supply output and an alarm indicating lamp according to the acquisition signal. The beneficial effects are that each input signal acquisition circuit works independently through an optocoupler, the reliability is high, and the anti-interference capability is strong.

Description

Technical Field

[0001] The present invention relates to a fire detection system. Background Art

[0002] The signal acquisition module is an important component in the fire detection system. The existing short-circuit isolation technology is mainly used for bus short-circuit isolation, isolating the equipment where the short-circuit occurs to ensure the normal operation of other equipment on the bus. After the fault is eliminated, the isolated part can be automatically reconnected to the system; however, the short-circuit isolation design for power supply output and signal input and output is very weak. When a short circuit or overvoltage fault occurs in an external line of a certain line, other input and output circuits cannot work normally; at the same time, the signal input and output circuits of the existing acquisition module are easily interfered by external circuits and have poor reliability. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the signal input and output circuits of the existing acquisition modules are easily interfered by external circuits and have poor reliability, and a multi-channel digital quantity input signal acquisition module circuit is proposed.

[0004] A multi-channel digital quantity input signal acquisition module circuit described in the present invention comprises an MCU control circuit, a power conversion circuit and a signal input circuit;

[0005] The power conversion circuit converts the 220V AC power into the power supply voltage of the MCU control circuit and the working voltage of the signal input circuit respectively;

[0006] The signal input circuit is used to collect the module switch button status and detector alarm information, and output the collected signal; and the signal input circuit has multiple input and output signals, and each input and output signal works independently;

[0007] The MCU control circuit is used to receive the acquisition signal output by the signal input circuit, and control the power supply output and the alarm indicator light according to the acquisition signal.

[0008] Furthermore, the MCU control circuit includes a main control chip U1, a crystal oscillator Y1, capacitors C1 to C4, resistors R1 to R3 and a JTAG interface U2;

[0009] The signal input circuit has five input and output signals;

[0010] The model of the main control chip U1 is: C8051F040 / 2 / 4 / 6;

[0011] Pin 1 of the main control chip U1 is connected to pin 5 of the JTAG interface U2;

[0012] Pin 2 of the main control chip U1 is connected to pin 4 of the JTAG interface U2 and one end of the resistor R3 at the same time; the other end of the resistor R3 is connected to pin 1 of the JTAG interface U2 and the 3.3V power output end at the same time;

[0013] Pin 3 of the main control chip U1 is connected to pin 7 of the JTAG interface U2;

[0014] Pin 4 of the main control chip U1 is connected to pin 6 of the JTAG interface U2; pin 2 of the JTAG interface U2 is grounded; pin 9 of the JTAG interface U2 is grounded;

[0015] Pin 5 of the main control chip U1 is connected to one end of the resistor R2 and one end of the capacitor C3 at the same time; the other end of the resistor R2 is connected to one end of the resistor R1 and one end of the capacitor C4 at the same time; the other end of the resistor R1 is connected to the 3.3V power supply output end; the other end of the capacitor C3 and the other end of the capacitor C4 are connected and grounded;

[0016] Pin 26 of the main control chip U1 is connected to one end of the capacitor C2 and one end of the crystal oscillator Y1 at the same time;

[0017] Pin 27 of the main control chip U1 is connected to one end of the capacitor C1 and the other end of the crystal oscillator Y1 at the same time; the other end of the capacitor C1 and the other end of the capacitor C2 are connected to the ground;

[0018] Pin 54 of the main control chip U1 is the first input end of the acquisition signal, and the first input end of the acquisition signal is connected to the first output end of the acquisition signal of the signal input circuit;

[0019] Pin 53 of the main control chip U1 is the second input end of the acquisition signal, and the second input end of the acquisition signal is connected to the second output end of the acquisition signal of the signal input circuit;

[0020] Pin 52 of the main control chip U1 is the third input terminal of the acquisition signal, and the third input terminal of the acquisition signal is connected to the third output terminal of the signal input circuit acquisition signal;

[0021] Pin 51 of the main control chip U1 is the fourth input terminal of the acquisition signal, and the fourth input terminal of the acquisition signal is connected to the fourth output terminal of the signal input circuit acquisition signal;

[0022] Pin No. 50 of the main control chip U1 is the fifth input terminal of the acquisition signal, and the fifth input terminal of the acquisition signal is connected to the fifth output terminal of the signal input circuit acquisition signal.

[0023] Further, the power conversion circuit includes a first power conversion circuit and a second power conversion circuit;

[0024] The first power conversion circuit is used to convert the 220V AC power into a 15V DC voltage and a 5V DC voltage respectively; wherein the 15V DC voltage is used as the working voltage of the signal input circuit 4;

[0025] The second power conversion circuit is used to convert the 5V DC voltage into a 3.3V DC voltage, and the 3.3V DC voltage is the power supply voltage of the MCU control circuit;

[0026] The first power conversion circuit includes an AC / DC converter U3, an AC / DC converter U4, a first gas discharge tube GDT1, a second gas discharge tube GDT2, resistors R4 to R6, capacitors C5 to C10, and a voltage regulator diode D1;

[0027] The ACL input end of the AC / DC converter U3 is simultaneously connected to the ACL input end of the AC / DC converter U4, one end of the capacitor C6, one end of the resistor R4, one end of the resistor R5, one end of the first gas discharge tube GDT1, and one end of the capacitor C5, and the ACL input end of the AC / DC converter U3 serves as a live wire input end of the 220V alternating current;

[0028] The ACN input terminal of the AC / DC converter U3 is simultaneously connected to the ACN input terminal of the AC / DC converter U4, the other end of the capacitor C6, the other end of the resistor R4, one end of the resistor R6, one end of the second gas discharge tube GDT1 and the other end of the capacitor C5, and the ACN input terminal of the AC / DC converter U3 serves as the neutral line input terminal of the 220V alternating current;

[0029] The other end of the first gas discharge tube GDT1 is simultaneously connected to the other end of the second gas discharge tube GDT2, the other end of the resistor R5 and the other end of the resistor R6;

[0030] The +15VDC output terminal of the AC / DC converter U3 is connected to one end of the capacitor C7 and one end of the capacitor C8 at the same time, and the +15VDC output terminal of the AC / DC converter U3 serves as a 15V DC voltage output terminal;

[0031] The ground terminal of the AC / DC converter U3 is simultaneously connected to the other end of the capacitor C7 and the other end of the capacitor C8, and is grounded;

[0032] The +5VDC output terminal of the AC / DC converter U4 is simultaneously connected to one end of the capacitor C9, the cathode of the voltage zener diode D1, and one end of the capacitor C10, and the +5VDC output terminal of the AC / DC converter U4 serves as a 5V DC voltage output terminal;

[0033] The ground terminal of the AC / DC converter U4 is simultaneously connected to the other end of the capacitor C9, the anode of the voltage zener diode D1 and the other end of the capacitor C10, and is grounded;

[0034] The second power conversion circuit includes a DC / DC converter U5, a diode D2, a capacitor C11 and a capacitor C12;

[0035] The input terminal Vin of the DC / DC converter U5 is connected to one end of the capacitor C11 and the cathode of the diode D2 at the same time, and the input terminal Vin of the DC / DC converter U5 serves as a 5V DC voltage input terminal;

[0036] The input terminal Vout of the DC / DC converter U5 is connected to one end of the capacitor C12 and the anode of the diode D2 at the same time, and the input terminal Vout of the DC / DC converter U5 serves as a 3.3V DC voltage output terminal;

[0037] The ground terminal of the DC / DC converter U5 is connected to the other end of the capacitor C11 and the other end of the capacitor C12 and is grounded.

[0038] Further, the signal input circuit includes a resistor R7, a resistor R8, an optical coupler U3B, a capacitor C11 and a diode DV15;

[0039] The diode anode of the optical coupler U3B is simultaneously connected to one end of the capacitor C11, one end of the resistor R8 and the cathode of the diode DV15, and the diode anode of the optical coupler U3B serves as the input end of the working voltage of the signal input circuit 4;

[0040] The cathode of the diode of the optical coupler U3B is simultaneously connected to the other end of the capacitor C11, the other end of the resistor R8 and the anode of the diode DV15, and the cathode of the diode of the optical coupler U3B is connected to each signal input end of the signal input interface;

[0041] The transistor collector of the optical coupler U3B is connected to one end of the resistor R7; the other end of the resistor R7 is connected to the acquisition signal input end of the MCU control circuit 1 as the acquisition signal output end;

[0042] The transistor emitter of the optocoupler U3B is grounded.

[0043] Furthermore, the module circuit also includes a safety gate circuit 3;

[0044] The safety barrier circuit is arranged between the input end of the signal input circuit 4 and the signal input interface; the safety barrier circuit 3 is used to perform overvoltage protection and current limiting protection on the signal input circuit.

[0045] Furthermore, the safety gate circuit includes a transient suppression diode DV4, a voltage regulator diode DV12, a resistor R9 and a resettable fuse FU4;

[0046] One end of the transient suppression diode DV4 is connected to the cathode of the voltage stabilizing diode DV12 and one end of the resistor R9 at the same time, and one end of the transient suppression diode DV4 is connected to each signal input end of the signal input interface; the other end of the transient suppression diode DV4 is connected to the anode of the voltage stabilizing diode DV12 and is grounded;

[0047] The other end of the resistor R9 is connected to one end of the resettable fuse FU4;

[0048] The other end of the resettable fuse FU4 is connected to the input end of the signal input circuit 4 .

[0049] The beneficial effects of the present invention are as follows: the circuit module of the present design is used in a fire detection system to receive the alarm signal digital input signal of the detector; each input signal acquisition circuit works independently through an optical coupler, and has high reliability and strong anti-interference ability. Each digital signal input end of the circuit module of the present design has a redundant overvoltage and current limiting protection circuit. When a short circuit or overvoltage fault occurs in an external line of a certain line, it can be automatically disconnected to isolate the fault, so as not to affect the normal operation of other input circuits of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a principle block diagram of a multi-channel digital quantity input signal acquisition module circuit described in the specific implementation mode 1;

[0051] Figure 2 It is a circuit diagram of the MCU control circuit in the first specific implementation mode;

[0052] Figure 3 is a circuit diagram of a power conversion circuit in a specific implementation mode 1;

[0053] Figure 4 A circuit diagram of a signal input circuit in a specific implementation mode 1;

[0054] Figure 5 It is a circuit diagram of the safety gate circuit in the first specific implementation mode. DETAILED DESCRIPTION

[0055] Specific implementation method 1. Combination Figures 1 to 5 This embodiment describes a multi-channel digital quantity input signal acquisition module circuit, which includes an MCU control circuit 1, a power conversion circuit 2 and a signal input circuit 4;

[0056] The power conversion circuit 2 converts the 220V AC power into the power supply voltage of the MCU control circuit 1 and the working voltage of the signal input circuit 4 respectively;

[0057] The signal input circuit 4 is used to collect the module switch button status and the detector alarm information, and output the collected signal; and the signal input circuit 4 has multiple input and output signals, and each input and output signal works independently;

[0058] The MCU control circuit 1 is used to receive the acquisition signal output by the signal input circuit 4, and control the power supply output and the alarm indicator light according to the acquisition signal.

[0059] In a preferred embodiment, the MCU control circuit 1 includes a main control chip U1, a crystal oscillator Y1, capacitors C1 to C4, resistors R1 to R3 and a JTAG interface U2;

[0060] The signal input circuit 4 has five input and output signals;

[0061] The model of the main control chip U1 is: C8051F040 / 2 / 4 / 6;

[0062] Pin 1 of the main control chip U1 is connected to pin 5 of the JTAG interface U2;

[0063] Pin 2 of the main control chip U1 is connected to pin 4 of the JTAG interface U2 and one end of the resistor R3 at the same time; the other end of the resistor R3 is connected to pin 1 of the JTAG interface U2 and the 3.3V power output end at the same time;

[0064] Pin 3 of the main control chip U1 is connected to pin 7 of the JTAG interface U2;

[0065] Pin 4 of the main control chip U1 is connected to pin 6 of the JTAG interface U2; pin 2 of the JTAG interface U2 is grounded; pin 9 of the JTAG interface U2 is grounded;

[0066] Pin 5 of the main control chip U1 is connected to one end of the resistor R2 and one end of the capacitor C3 at the same time; the other end of the resistor R2 is connected to one end of the resistor R1 and one end of the capacitor C4 at the same time; the other end of the resistor R1 is connected to the 3.3V power supply output end; the other end of the capacitor C3 and the other end of the capacitor C4 are connected and grounded;

[0067] Pin 26 of the main control chip U1 is connected to one end of the capacitor C2 and one end of the crystal oscillator Y1 at the same time;

[0068] Pin 27 of the main control chip U1 is connected to one end of the capacitor C1 and the other end of the crystal oscillator Y1 at the same time; the other end of the capacitor C1 and the other end of the capacitor C2 are connected to the ground;

[0069] Pin 54 of the main control chip U1 is the first input terminal of the acquisition signal, and the first input terminal of the acquisition signal is connected to the first output terminal of the acquisition signal of the signal input circuit 4;

[0070] Pin 53 of the main control chip U1 is the second input terminal of the acquisition signal, and the second input terminal of the acquisition signal is connected to the second output terminal of the acquisition signal of the signal input circuit 4;

[0071] Pin 52 of the main control chip U1 is the third input terminal of the acquisition signal, and the third input terminal of the acquisition signal is connected to the third output terminal of the acquisition signal of the signal input circuit 4;

[0072] Pin 51 of the main control chip U1 is the fourth input terminal of the acquisition signal, and the fourth input terminal of the acquisition signal is connected to the fourth output terminal of the acquisition signal of the signal input circuit 4;

[0073] Pin No. 50 of the main control chip U1 is the fifth input terminal of the acquisition signal, and the fifth input terminal of the acquisition signal is connected to the fifth output terminal of the acquisition signal of the signal input circuit 4 .

[0074] In a preferred embodiment, the power conversion circuit 2 includes a first power conversion circuit and a second power conversion circuit;

[0075] The first power conversion circuit is used to convert the 220V AC power into a 15V DC voltage and a 5V DC voltage respectively; wherein the 15V DC voltage is used as the working voltage of the signal input circuit 4;

[0076] The second power conversion circuit is used to convert the 5V DC voltage into a 3.3V DC voltage, and the 3.3V DC voltage is the power supply voltage of the MCU control circuit 1;

[0077] The first power conversion circuit includes an AC / DC converter U3, an AC / DC converter U4, a first gas discharge tube GDT1, a second gas discharge tube GDT2, resistors R4 to R6, capacitors C5 to C10, and a voltage regulator diode D1;

[0078] The ACL input end of the AC / DC converter U3 is simultaneously connected to the ACL input end of the AC / DC converter U4, one end of the capacitor C6, one end of the resistor R4, one end of the resistor R5, one end of the first gas discharge tube GDT1, and one end of the capacitor C5, and the ACL input end of the AC / DC converter U3 serves as a live wire input end of the 220V alternating current;

[0079] The ACN input terminal of the AC / DC converter U3 is simultaneously connected to the ACN input terminal of the AC / DC converter U4, the other end of the capacitor C6, the other end of the resistor R4, one end of the resistor R6, one end of the second gas discharge tube GDT1 and the other end of the capacitor C5, and the ACN input terminal of the AC / DC converter U3 serves as the neutral line input terminal of the 220V alternating current;

[0080] The other end of the first gas discharge tube GDT1 is simultaneously connected to the other end of the second gas discharge tube GDT2, the other end of the resistor R5 and the other end of the resistor R6;

[0081] The +15VDC output terminal of the AC / DC converter U3 is connected to one end of the capacitor C7 and one end of the capacitor C8 at the same time, and the +15VDC output terminal of the AC / DC converter U3 serves as a 15V DC voltage output terminal;

[0082] The ground terminal of the AC / DC converter U3 is simultaneously connected to the other end of the capacitor C7 and the other end of the capacitor C8, and is grounded;

[0083] The +5VDC output terminal of the AC / DC converter U4 is simultaneously connected to one end of the capacitor C9, the cathode of the voltage zener diode D1, and one end of the capacitor C10, and the +5VDC output terminal of the AC / DC converter U4 serves as a 5V DC voltage output terminal;

[0084] The ground terminal of the AC / DC converter U4 is simultaneously connected to the other end of the capacitor C9, the anode of the voltage zener diode D1 and the other end of the capacitor C10, and is grounded;

[0085] The second power conversion circuit includes a DC / DC converter U5, a diode D2, a capacitor C11 and a capacitor C12;

[0086] The input terminal Vin of the DC / DC converter U5 is connected to one end of the capacitor C11 and the cathode of the diode D2 at the same time, and the input terminal Vin of the DC / DC converter U5 serves as a 5V DC voltage input terminal;

[0087] The input terminal Vout of the DC / DC converter U5 is connected to one end of the capacitor C12 and the anode of the diode D2 at the same time, and the input terminal Vout of the DC / DC converter U5 serves as a 3.3V DC voltage output terminal;

[0088] The ground terminal of the DC / DC converter U5 is connected to the other end of the capacitor C11 and the other end of the capacitor C12 and is grounded.

[0089] In a preferred embodiment, the signal input circuit 4 includes a resistor R7, a resistor R8, an optical coupler U3B, a capacitor C11 and a diode DV15;

[0090] The diode anode of the optical coupler U3B is simultaneously connected to one end of the capacitor C11, one end of the resistor R8 and the cathode of the diode DV15, and the diode anode of the optical coupler U3B serves as the input end of the working voltage of the signal input circuit 4;

[0091] The cathode of the diode of the optical coupler U3B is simultaneously connected to the other end of the capacitor C11, the other end of the resistor R8 and the anode of the diode DV15, and the cathode of the diode of the optical coupler U3B is connected to each signal input end of the signal input interface;

[0092] The transistor collector of the optical coupler U3B is connected to one end of the resistor R7; the other end of the resistor R7 is connected to the acquisition signal input end of the MCU control circuit 1 as the acquisition signal output end;

[0093] The transistor emitter of the optocoupler U3B is grounded.

[0094] In a preferred embodiment, the module circuit further includes a safety gate circuit 3;

[0095] The safety barrier circuit 3 is arranged between the input end of the signal input circuit 4 and the signal input interface; the safety barrier circuit 3 is used to perform overvoltage protection and current limiting protection on the signal input circuit 4.

[0096] In a preferred embodiment, the safety gate circuit 3 includes a transient suppression diode DV4, a voltage regulator diode DV12, a resistor R9 and a self-recovery fuse FU4;

[0097] One end of the transient suppression diode DV4 is connected to the cathode of the voltage stabilizing diode DV12 and one end of the resistor R9 at the same time, and one end of the transient suppression diode DV4 is connected to each signal input end of the signal input interface; the other end of the transient suppression diode DV4 is connected to the anode of the voltage stabilizing diode DV12 and is grounded;

[0098] The other end of the resistor R9 is connected to one end of the resettable fuse FU4;

[0099] The other end of the resettable fuse FU4 is connected to the input end of the signal input circuit 4 .

[0100] In this embodiment, during normal operation, the power conversion circuit 2 converts 220V AC into the module output power supply voltage and the module working voltage, the signal input circuit 4 collects the module switch button status and the detector alarm information, and controls the power supply output and the alarm indicator light through the MCU control circuit 1. Each signal input circuit 4 works independently and has a safety gate protection circuit 3; the module's multi-channel digital signal input and output are independently controlled by the corresponding single-chip microcomputer pins, and the output is isolated by the optical coupler U3B, which is not interfered by the external circuit and has high reliability; therefore, the circuit module of this design has the characteristics of strong anti-interference ability. When a short circuit or overvoltage fault occurs in a certain external line, it can be automatically disconnected to isolate the fault, so as not to affect the normal operation of other input and output circuits of the module.

[0101] 1. Multiple digital signal input signals are isolated through the optocoupler U3B. For example, when the input of the optocoupler U3B input is a low-level alarm signal, the optocoupler U3B internal photoelectric device is turned on, and the output of the optocoupler U3B outputs a low level to the IO pin of the main control chip U1 in the MCU control circuit 1. The main control chip U1 pin collects and receives the low-level input signal and processes the alarm information. Multiple digital signal input signals are isolated through the optocoupler U3B, are not interfered by external circuits, and have high reliability.

[0102] 2. Each digital signal input terminal of this circuit module has redundant overvoltage protection and current limiting protection circuits. Figure 5 As shown, in the safety gate circuit 3, DV12 is a voltage-stabilizing diode, and DV4 is a transient suppression diode, which is used for module circuit input overvoltage protection. The voltage-stabilizing diode works in the conduction area to stabilize the input voltage within the operating voltage range, and the transient suppression diode works in the cut-off area to prevent input overvoltage and protect the circuit. The two are used in parallel for redundancy. If any one device fails, the other can still play an overvoltage protection role; R9 is a 200 ohm current-limiting resistor, and FU4 is a self-recovery fuse, which is used for module circuit input overcurrent protection. This redundant circuit protection design makes the input module circuit more reliable.

[0103] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-channel digital input signal acquisition module circuit, characterized in that: The acquisition module circuit comprises an MCU control circuit (1), a power conversion circuit (2) and a signal input circuit (4); The power conversion circuit (2) converts the 220V AC power into the power supply voltage of the MCU control circuit (1) and the working voltage of the signal input circuit (4); The signal input circuit (4) is used to collect the module switch button status and the detector alarm information, and output the collected signal; and the signal input circuit (4) has multiple input and output signals, and each input and output signal works independently; The MCU control circuit (1) is used to receive the collection signal output by the signal input circuit (4), and control the power supply output and the alarm indicator light according to the collection signal.

2. A multi-channel digital input signal acquisition module circuit according to claim 1, characterized in that: The MCU control circuit (1) comprises a main control chip U1, a crystal oscillator Y1, capacitors C1 to C4, resistors R1 to R3 and a JTAG interface U2; The signal input circuit (4) has five input and output signal paths; The model of the main control chip U1 is: C8051F040 / 2 / 4 / 6; Pin 1 of the main control chip U1 is connected to pin 5 of the JTAG interface U2; Pin 2 of the main control chip U1 is connected to pin 4 of the JTAG interface U2 and one end of the resistor R3 at the same time; the other end of the resistor R3 is connected to pin 1 of the JTAG interface U2 and the 3.3V power supply output end at the same time; Pin 3 of the main control chip U1 is connected to pin 7 of the JTAG interface U2; Pin 4 of the main control chip U1 is connected to pin 6 of the JTAG interface U2; pin 2 of the JTAG interface U2 is grounded; pin 9 of the JTAG interface U2 is grounded; Pin 5 of the main control chip U1 is connected to one end of the resistor R2 and one end of the capacitor C3 at the same time; the other end of the resistor R2 is connected to one end of the resistor R1 and one end of the capacitor C4 at the same time; the other end of the resistor R1 is connected to the 3.3V power supply output end; the other end of the capacitor C3 and the other end of the capacitor C4 are connected and grounded; Pin 26 of the main control chip U1 is connected to one end of the capacitor C2 and one end of the crystal oscillator Y1 at the same time; Pin 27 of the main control chip U1 is connected to one end of the capacitor C1 and the other end of the crystal oscillator Y1 at the same time; the other end of the capacitor C1 and the other end of the capacitor C2 are connected to the ground; Pin No. 54 of the main control chip U1 is the first input end of the acquisition signal, and the first input end of the acquisition signal is connected to the first output end of the acquisition signal of the signal input circuit (4); Pin 53 of the main control chip U1 is a second input terminal for collecting signals, and the second input terminal for collecting signals is connected to a second output terminal for collecting signals of the signal input circuit (4); Pin No. 52 of the main control chip U1 is the third input terminal of the acquisition signal, and the third input terminal of the acquisition signal is connected to the third output terminal of the acquisition signal of the signal input circuit (4); Pin No. 51 of the main control chip U1 is the fourth input terminal of the acquisition signal, and the fourth input terminal of the acquisition signal is connected to the fourth output terminal of the acquisition signal of the signal input circuit (4); Pin No. 50 of the main control chip U1 is the fifth input terminal of the acquisition signal, and the fifth input terminal of the acquisition signal is connected to the fifth output terminal of the acquisition signal of the signal input circuit (4).

3. The multi-channel digital input signal acquisition module circuit according to claim 1, characterized in that: The power conversion circuit (2) comprises a first power conversion circuit and a second power conversion circuit; The first power conversion circuit is used to convert 220V AC power into 15V DC voltage and 5V DC voltage respectively; wherein the 15V DC voltage is used as the working voltage of the signal input circuit (4); The second power conversion circuit is used to convert the 5V DC voltage into a 3.3V DC voltage, and the 3.3V DC voltage is the power supply voltage of the MCU control circuit (1); The first power conversion circuit includes an AC / DC converter U3, an AC / DC converter U4, a first gas discharge tube GDT1, a second gas discharge tube GDT2, resistors R4 to R6, capacitors C5 to C10, and a voltage regulator diode D1; The AC (L) input end of the AC / DC converter U3 is simultaneously connected to the AC (L) input end of the AC / DC converter U4, one end of the capacitor C6, one end of the resistor R4, one end of the resistor R5, one end of the first gas discharge tube GDT1 and one end of the capacitor C5, and the AC (L) input end of the AC / DC converter U3 serves as a live wire input end of the 220V alternating current; The AC (N) input terminal of the AC / DC converter U3 is simultaneously connected to the AC (N) input terminal of the AC / DC converter U4, the other end of the capacitor C6, the other end of the resistor R4, one end of the resistor R6, one end of the second gas discharge tube GDT1 and the other end of the capacitor C5, and the AC (N) input terminal of the AC / DC converter U3 serves as the neutral line input terminal of the 220V alternating current; The other end of the first gas discharge tube GDT1 is simultaneously connected to the other end of the second gas discharge tube GDT2, the other end of the resistor R5 and the other end of the resistor R6; The +15VDC output terminal of the AC / DC converter U3 is connected to one end of the capacitor C7 and one end of the capacitor C8 at the same time, and the +15VDC output terminal of the AC / DC converter U3 serves as a 15V DC voltage output terminal; The ground terminal of the AC / DC converter U3 is simultaneously connected to the other end of the capacitor C7 and the other end of the capacitor C8, and is grounded; The +5VDC output terminal of the AC / DC converter U4 is simultaneously connected to one end of the capacitor C9, the cathode of the voltage zener diode D1, and one end of the capacitor C10, and the +5VDC output terminal of the AC / DC converter U4 serves as a 5V DC voltage output terminal; The ground terminal of the AC / DC converter U4 is simultaneously connected to the other end of the capacitor C9, the anode of the voltage zener diode D1 and the other end of the capacitor C10, and is grounded; The second power conversion circuit includes a DC / DC converter U5, a diode D2, a capacitor C11 and a capacitor C12; The input terminal Vin of the DC / DC converter U5 is connected to one end of the capacitor C11 and the cathode of the diode D2 at the same time, and the input terminal Vin of the DC / DC converter U5 serves as a 5V DC voltage input terminal; The input terminal Vout of the DC / DC converter U5 is connected to one end of the capacitor C12 and the anode of the diode D2 at the same time, and the input terminal Vout of the DC / DC converter U5 serves as a 3.3V DC voltage output terminal; The ground terminal of the DC / DC converter U5 is connected to the other end of the capacitor C11 and the other end of the capacitor C12 and is grounded.

4. The multi-channel digital input signal acquisition module circuit according to claim 1, characterized in that: The signal input circuit (4) comprises a resistor R7, a resistor R8, an optical coupler U3B, a capacitor C11 and a diode DV15; The diode anode of the optical coupler U3B is simultaneously connected to one end of the capacitor C11, one end of the resistor R8 and the cathode of the diode DV15, and the diode anode of the optical coupler U3B serves as the input end of the working voltage of the signal input circuit (4); The cathode of the diode of the optical coupler U3B is simultaneously connected to the other end of the capacitor C11, the other end of the resistor R8 and the anode of the diode DV15, and the cathode of the diode of the optical coupler U3B is connected to each signal input end of the signal input interface; The transistor collector of the optical coupler U3B is connected to one end of the resistor R7; the other end of the resistor R7 is connected to the signal collection input end of the MCU control circuit (1) as the signal collection output end; The transistor emitter of the optocoupler U3B is grounded.

5. The multi-channel digital input signal acquisition module circuit according to claim 1, characterized in that: The module circuit also includes a safety gate circuit (3); The safety barrier circuit (3) is arranged between the input end of the signal input circuit (4) and the signal input interface; the safety barrier circuit (3) is used to perform overvoltage protection and current limiting protection on the signal input circuit (4).

6. A multi-channel digital input signal acquisition module circuit according to claim 5, characterized in that: The safety gate circuit (3) comprises a transient suppression diode DV4, a voltage stabilizing diode DV12, a resistor R9 and a self-recovery fuse FU4; One end of the transient suppression diode DV4 is connected to the cathode of the voltage stabilizing diode DV12 and one end of the resistor R9 at the same time, and one end of the transient suppression diode DV4 is connected to each signal input end of the signal input interface; the other end of the transient suppression diode DV4 is connected to the anode of the voltage stabilizing diode DV12 and is grounded; The other end of the resistor R9 is connected to one end of the resettable fuse FU4; The other end of the resettable fuse FU4 is connected to the input end of the signal input circuit (4).

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