A power supply monitoring system and power supply protection circuit thereof

Abstract

The present invention discloses a power supply monitoring system and a power supply protection circuit thereof, which relate to the technical field of power supply monitoring power supply, including a power supply control module for electric energy transmission; an intelligent control module for signal reception and module control; a backup source control module for backup power supply and electric energy superposition; a power supply processing module for rectification, voltage stabilization and energy storage; a leakage detection module for leakage judgment; a signal processing module for signal self-locking and power off control, which stops working when leakage is detected for the second time; a signal transmission module for voltage and current sampling and signal transmission to a power supply monitoring module, which transmits the signal to the intelligent control module during power switching, and the switching is completed, and the intelligent control module interacts with the power supply monitoring module; and the power supply monitoring module is used for signal reception and processing. The power supply monitoring system and the power supply protection circuit of the present invention perform leakage protection and uninterrupted power supply protection, avoid sampling signal loss and improve power supply efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of power supply monitoring power supply, in particular to a power supply monitoring system and a power supply protection circuit thereof. Background Art

[0002] The power supply monitoring system is an intelligent device based on computer and network technology for monitoring and controlling the power supply end, realizing real-time voltage and current detection of the power supply end. To ensure the safety of power supply, the power supply monitoring system in the prior art generally performs leakage detection on the input power supply to avoid the impact on the power supply monitoring equipment when the power supply leaks. However, since it is impossible to effectively determine the leakage location, when leakage occurs, the power supply of the power supply monitoring equipment can only be disconnected, resulting in the inability of the power supply monitoring equipment to perform power supply monitoring normally. In addition, when low voltage appears at the power supply end of the power supply monitoring equipment, the power supply to the power supply monitoring equipment cannot be maintained, and the power supply efficiency is low, so it needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a power supply monitoring system and a power supply protection circuit thereof to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a power supply monitoring system and a power supply protection circuit thereof are provided, including: a power supply control module, an intelligent control module, a backup source control module, a power supply processing module, a leakage detection module, a signal processing module, a power supply monitoring module and a signal transmission module;

[0005] A power control module, connected to the backup source control module and the signal processing module, for receiving AC power and transmitting the AC power to the backup source control module, and stopping the transmission of AC power upon receiving the first protection signal output by the signal processing module;

[0006] An intelligent control module, connected to the signal processing module, the power supply monitoring module and the signal transmission module, for outputting a first control signal upon receiving a first protection signal output by the signal processing module, processing a sampling signal output by the signal transmission module and outputting a data signal, transmitting the data signal to the power supply monitoring module when data is exchanged with the power supply monitoring module, outputting a second control signal when the AC power energy connected to the power supply module is at a working voltage required by the power supply monitoring module, outputting a reset signal when the signal processing module needs to be reset, and stopping outputting the first control signal upon receiving a second protection signal output by the signal processing module;

[0007] A backup source control module, connected to the intelligent control module and the power supply monitoring module, for receiving AC power and providing backup power, inverting the backup power and outputting the first power, directly outputting the first power when receiving the first control signal, superimposing the first power with the AC power and outputting the second power when receiving the second control signal, and transmitting the AC power, the first power or the second power to the power supply monitoring module;

[0008] A power processing module, connected to the backup source control module, the power control module and the leakage detection module, for rectifying and stabilizing the AC power, the first power or the second power output by the backup source control module and supplying power to the power control module and the leakage detection module;

[0009] a leakage detection module, connected to the power supply monitoring module, for receiving the electric energy output by the power supply processing module and performing leakage judgment on the AC electric energy, the first electric energy or the second electric energy input to the power supply monitoring module, and outputting a first leakage signal when leakage occurs;

[0010] A signal processing module, connected to the backup power source control module and the leakage detection module, configured to receive backup power, perform self-locking processing on the first leakage signal and output a first protection signal, stop outputting the first protection signal when receiving a reset signal, and output a second protection signal when receiving the first protection signal and the first leakage signal at the same time;

[0011] A signal transmission module, connected to the power supply monitoring module and the signal processing module, for sampling the voltage and current of the power supply end and transmitting the sampled sampling signal to the power supply monitoring module, transmitting the sampled signal to the intelligent control module when receiving the first protection signal, the first control signal or the second control signal, and retransmitting the sampled signal to the power supply monitoring module when receiving the second protection signal or the duration of receiving the first control signal or the second control signal exceeds the set timing time;

[0012] The power supply monitoring module is used to receive AC power, the first power or the second power and store and process the sampling signal and the data signal.

[0013] As a further solution of the present invention: the power supply control module includes an input port and a first relay switch; the backup source control module includes a first transformer; the leakage detection module includes a first mutual inductor; the power supply monitoring module includes a power supply monitoring device; the intelligent control module includes a first controller;

[0014] Preferably, the first end and the second end of the input port are respectively connected to the first moving end and the second moving end of the first relay switch, the fixed end of the first relay switch is connected to the first end of the secondary side of the first transformer, the second end of the secondary side of the first transformer and the second fixed end of the first relay switch both pass through the center of the first mutual inductor and are respectively connected to the first power supply end and the second power supply end of the power supply monitoring device, and the first receiving end of the power supply monitoring device is connected to the IO5 end of the first controller.

[0015] As a further solution of the present invention: the backup source control module also includes a backup power supply, a first inverter, a first thyristor, a second thyristor, a second relay switch, a fifth switch tube, a second relay and a fourth diode;

[0016] Preferably, the moving end of the second relay switch is connected to the first fixed end of the first relay switch and the first end of the secondary side of the first transformer, the first end of the primary side of the first transformer is connected to one end of the first thyristor, the second end of the primary side of the first transformer is connected to one end of the second thyristor, the other end of the first thyristor and the other end of the second thyristor are respectively connected to the first output end and the second output end of the first inverter, the first end of the backup power supply is connected to the first input end of the first inverter and one end of the second relay, the second end of the backup power supply and the second input end of the first inverter are both grounded, the control end of the first thyristor and the control end of the second thyristor are both connected to the cathode of the fourth diode and the IO2 end of the first controller, the IO1 end of the first controller is connected to the anode of the fourth diode and the base of the fifth switch tube, the fixed end of the second relay switch is connected to the second fixed end of the first relay switch, the other end of the second relay is connected to the collector of the fifth switch tube, and the emitter of the fifth switch tube is grounded.

[0017] As a further solution of the present invention: the power processing module includes a first rectifier, a first voltage stabilizer, a first diode and a first capacitor; the power control module also includes a first relay and a first switch tube;

[0018] Preferably, the first end and the second end of the first rectifier are respectively connected to the second end of the secondary side of the first transformer and the second fixed end of the first relay switch, the third end of the first rectifier is connected to the third end of the first voltage regulator, the second end of the first voltage regulator is connected to the anode of the first diode, the cathode of the first diode is connected to one end of the first capacitor and one end of the first relay, the other end of the first relay is connected to the collector of the first switch tube, the base of the first switch tube is connected to the signal processing module, and the emitter of the first switch tube, the other end of the first capacitor, the first end of the first voltage regulator and the fourth end of the first rectifier are all grounded.

[0019] As a further solution of the present invention: the leakage detection module further includes a first resistor, a second resistor, a third resistor, a second capacitor and a first detection device;

[0020] Preferably, one end of the first resistor is connected to the first output end of the first mutual inductor and connected to one end of the second capacitor and the first end of the first detection device through the second resistor, the other end of the first resistor is connected to the second output end of the first mutual inductor and connected to the other end of the second capacitor and the second end of the first detection device through the third resistor, the eighth end of the first detection device is connected to the second end of the first regulator, and the seventh end of the first detection device is connected to the signal processing module.

[0021] As a further solution of the present invention: the signal processing module includes a third diode, a second diode, a first logic chip, a second switch tube, an eighth diode and a second logic chip;

[0022] Preferably, the anode of the third diode is connected to the B end of the second logic chip and the seventh end of the first detection device, the cathode of the third diode is connected to the cathode of the second diode and the B end of the first logic chip, the F end of the first logic chip is connected to the anode of the second diode, the base of the first switching tube, the A end of the second logic chip, the IO3 end of the first controller and the signal transmission module, the F end of the second logic chip is connected to the IO6 end of the first controller and the anode of the eighth diode, the A end of the first logic chip is connected to the collector of the second switching tube and is connected to the first end of the backup power supply through the fourth resistor, and the emitter of the second switching tube is grounded.

[0023] As a further solution of the present invention: the signal transmission module includes a signal acquisition device, a first analog switch, a fifth resistor, a first power supply, a sixth diode, a seventh diode, a fifth diode, a third capacitor, a third switch tube and a fourth switch tube;

[0024] Preferably, the IN1 and IN2 terminals of the first analog switch are both connected to the output terminal of the signal acquisition device, the OUT1 terminal of the first analog switch is connected to the second receiving terminal of the power supply monitoring device, the OUT2 terminal of the first analog switch is connected to the IO7 terminal of the first controller, the CTRL1 terminal of the first analog switch is connected to the collector of the third switch tube and is connected to the first power supply through the fifth resistor, the base of the third switch tube is connected to the F terminal of the first logic chip, the cathode of the sixth diode, the collector of the fourth switch tube and the CTRL2 terminal of the first analog switch, the emitter of the fourth switch tube and the emitter of the third switch tube are both grounded, the base of the fourth switch tube is connected to the cathode of the eighth diode and the cathode of the fifth diode, the anode of the fifth diode is connected to the cathode of the seventh diode and is grounded through the third capacitor, and the anode of the seventh diode is connected to the IO2 terminal of the first controller and the anode of the sixth diode.

[0025] In addition, a power supply monitoring system is also provided. The power supply monitoring system includes the power supply protection circuit described in the embodiment of the present invention.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the power supply monitoring system and the power supply protection circuit of the present invention use the signal transmission module to sample the voltage and current of the power supply end and transmit the sampled signal to the power supply monitoring module, the leakage detection module detects the leakage of the electric energy transmitted from the power control module to the power supply monitoring module, and when leakage occurs, the signal processing module self-locks and controls the power control module to perform power-off protection, at which time the backup source control module will re-power the power supply monitoring module, and during power switching, the sampling signal loss is avoided, the signal transmission module will transmit the sampled signal to the intelligent control module and transmit the received signal to the power supply monitoring module when the backup source control module completes the power supply to the power supply monitoring module, if the leakage detection module still detects leakage when the backup source control module is supplying power, at which time the power supply of the backup source control module and the operation of the power supply monitoring module will be completely stopped, thereby improving the safety of the circuit, and the leakage position can be obtained, which is convenient for maintenance, and when the supply voltage is lower than the required electric energy, the backup source control module can perform electric energy superposition to meet the power supply demand and improve the power supply efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 A schematic block diagram of a power supply monitoring system and a power supply protection circuit thereof provided in an embodiment of the present invention.

[0029] Figure 2 A circuit diagram of a power supply monitoring system and a power supply protection circuit thereof provided in an embodiment of the present invention.

[0030] Figure 3 A circuit diagram of a signal transmission module provided in an embodiment of the present invention.

[0031] Figure 4 A circuit diagram of a backup source control module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In another embodiment, see Figure 1 , a power supply monitoring system and a power supply protection circuit thereof, comprising: a power supply control module 1, an intelligent control module 2, a backup source control module 3, a power supply processing module 4, a leakage detection module 5, a signal processing module 6, a power supply monitoring module 7 and a signal transmission module 8;

[0034] Specifically, the power control module 1 is connected to the backup source control module 3 and the signal processing module 6, and is used to access the AC power and transmit the AC power to the backup source control module 3, and stop transmitting the AC power when receiving the first protection signal output by the signal processing module 6;

[0035] The intelligent control module 2 is connected to the signal processing module 6, the power supply monitoring module 7 and the signal transmission module 8, and is used to output a first control signal when receiving a first protection signal output by the signal processing module 6, process the sampling signal output by the signal transmission module 8 and output a data signal, transmit the data signal to the power supply monitoring module 7 when performing data interaction with the power supply monitoring module 7, output a second control signal when the AC power energy connected to the power supply module is at the working voltage required by the power supply monitoring module 7, output a reset signal when the signal processing module 6 needs to be reset, and stop outputting the first control signal when receiving the second protection signal output by the signal processing module 6;

[0036] The backup source control module 3 is connected to the intelligent control module 2 and the power supply monitoring module 7, and is used to receive AC power and provide backup power, invert the backup power and output the first power, directly output the first power when receiving the first control signal, and superimpose the first power with the AC power and output the second power when receiving the second control signal, and transmit the AC power, the first power or the second power to the power supply monitoring module 7;

[0037] The power processing module 4 is connected to the backup source control module 3, the power control module 1 and the leakage detection module 5, and is used to rectify and stabilize the AC power, the first power or the second power output by the backup source control module 3 and supply power to the power control module 1 and the leakage detection module 5;

[0038] The leakage detection module 5 is connected to the power supply monitoring module 7, and is used to receive the electric energy output by the power supply processing module 4 and to perform leakage judgment on the AC electric energy, the first electric energy or the second electric energy input to the power supply monitoring module 7, and output a first leakage signal when leakage occurs;

[0039] The signal processing module 6 is connected to the backup power source control module 3 and the leakage detection module 5, and is used to receive the backup power, perform self-locking processing on the first leakage signal and output the first protection signal, stop outputting the first protection signal when receiving the reset signal, and output the second protection signal when receiving the first protection signal and the first leakage signal at the same time;

[0040] The signal transmission module 8 is connected to the power supply monitoring module 7 and the signal processing module 6, and is used to sample the voltage and current of the power supply end and transmit the sampled signal to the power supply monitoring module 7. When the first protection signal, the first control signal or the second control signal is received, the sampled signal is transmitted to the intelligent control module 2. When the second protection signal is received or the duration of receiving the first control signal or the second control signal exceeds the set timing time, the sampled signal is retransmitted to the power supply monitoring module 7;

[0041] The power supply monitoring module 7 is used to receive AC power, the first power or the second power and store and process the sampling signal and the data signal.

[0042] In a specific embodiment, the power control module 1 can adopt a power control circuit composed of an input interface, relays, transistors, etc., which can be connected to AC power, and the transmission state of AC power can be controlled by the signal processing module 6; the intelligent control module 2 can adopt an intelligent control circuit composed of a single-chip microcomputer, which integrates many components such as an arithmetic unit, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the backup source control module 3 can adopt a backup source control circuit composed of a backup power supply, an inverter, a transformer, etc., which can provide backup power and invert the backup power, transmit the inverted power, and realize backup power supply and power superposition processing; the power processing module 4 can adopt a power processing circuit composed of a rectifier, a voltage stabilizer, a capacitor, etc., which can rectify and stabilize the input signal and store the stabilized power; the leakage detection module 5 can adopt a current transformer, a resistor, a leakage detection The leakage detection circuit composed of a detection device, etc. can perform leakage detection and self-lock to output a signal in a high-level state when leakage occurs, and stop the self-locking work when the power is off; the above-mentioned signal processing module 6 can adopt a signal processing circuit composed of a logic chip, a diode, a triode, etc., which can self-lock the signal output by the leakage detection module 5 and detect whether leakage occurs for the second time; the above-mentioned power supply monitoring module 7 can adopt a power supply monitoring circuit composed of a power supply monitoring device to receive, store and process the signal transmitted by the signal transmission module 8; the above-mentioned signal transmission module 8 can adopt a signal transmission circuit composed of a signal acquisition device, an analog switch, a triode, a capacitor, etc., which can detect the voltage and current at the power supply end and output a sampling signal, transmit the sampling signal to the power supply monitoring module 7, and when the backup source control module 3 starts to supply power, the sampling signal is transmitted to the intelligent control module 2, and after the backup source control module 3 completes normal power supply, the signal is re-transmitted to the power supply monitoring module 7.

[0043] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The power supply control module 1 includes an input port and a first relay switch K1-1; the backup source control module 3 includes a first transformer B1; the leakage detection module 5 includes a first mutual inductor ZCT; the power supply monitoring module 7 includes a power supply monitoring device; the intelligent control module 2 includes a first controller U1;

[0044] Specifically, the first end and the second end of the input port are respectively connected to the first moving end and the second moving end of the first relay switch K1-1, the fixed end of the first relay switch K1-1 is connected to the first end of the secondary side of the first transformer B1, the second end of the secondary side of the first transformer B1 and the second fixed end of the first relay switch K1-1 both pass through the center of the first transformer ZCT and are respectively connected to the first power supply VCC1 end and the second power supply end of the power supply monitoring device, and the first receiving end of the power supply monitoring device is connected to the IO5 end of the first controller U1.

[0045] In a specific embodiment, the first relay switch K1-1 may be a double-pole double-throw normally closed switch; the first transformer B1 may be a coupling transformer; the first transformer ZCT may be a current transformer; the power supply monitoring device may be composed of a digital processor and a communication chip; and the first controller U1 may be an STM32 single-chip microcomputer.

[0046] Furthermore, the backup source control module 3 also includes a backup power supply, a first inverter T2, a first thyristor S1, a second thyristor S2, a second relay switch K2-1, a fifth switch tube V5, a second relay K2 and a fourth diode D4;

[0047] Specifically, the moving end of the second relay switch K2-1 is connected to the first fixed end of the first relay switch K1-1 and the first end of the secondary side of the first transformer B1, the first end of the primary side of the first transformer B1 is connected to one end of the first thyristor S1, the second end of the primary side of the first transformer B1 is connected to one end of the second thyristor S2, the other end of the first thyristor S1 and the other end of the second thyristor S2 are respectively connected to the first output end and the second output end of the first inverter T2, the first end of the backup power supply is connected to the first input end of the first inverter T2 and the first end of the second relay K2. The first controller U1 of FIG1 is connected to the cathode of the fourth diode D4 and the IO2 terminal of the first controller U1, the IO1 terminal of the first controller U1 is connected to the anode of the fourth diode D4 and the base of the fifth switch tube V5, the fixed end of the second relay switch K2-1 is connected to the second fixed end of the first relay switch K1-1, the other end of the second relay K2 is connected to the collector of the fifth switch tube V5, and the emitter of the fifth switch tube V5 is grounded.

[0048] In a specific embodiment, the above-mentioned backup power supply can be a battery pack; the above-mentioned first inverter T2 can be a full-bridge inverter composed of four groups of IGBTs; the above-mentioned first thyristor S1 and the second thyristor S2 can both be unidirectional thyristors; the above-mentioned first transformer B1 can be a coupling transformer; the above-mentioned second relay switch K2-1 can be a normally open switch, and the closing of the second relay switch K2-1 is controlled by magnetic attraction by the second relay K2; the above-mentioned fifth switch tube V5 can be an NPN transistor.

[0049] Furthermore, the power processing module 4 includes a first rectifier T1, a first voltage regulator IC1, a first diode D1 and a first capacitor C1; the power control module 1 also includes a first relay K1 and a first switch tube V1;

[0050] Specifically, the first end and the second end of the first rectifier T1 are respectively connected to the second end of the secondary side of the first transformer B1 and the second fixed end of the first relay switch K1-1, the third end of the first rectifier T1 is connected to the third end of the first voltage regulator IC1, the second end of the first voltage regulator IC1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to one end of the first capacitor C1 and one end of the first relay K1, the other end of the first relay K1 is connected to the collector of the first switch tube V1, the base of the first switch tube V1 is connected to the signal processing module 6, and the emitter of the first switch tube V1, the other end of the first capacitor C1, the first end of the first voltage regulator IC1 and the fourth end of the first rectifier T1 are all grounded.

[0051] In a specific embodiment, the first voltage regulator IC1 can be a 7812 voltage regulator; the first diode D1 and the first capacitor C1 perform rectification and energy storage so as to provide short-term power to the first relay K1 when the power is off; the first relay K1 controls the disconnection of the first relay switch K1-1 by magnetic attraction; the first switch tube V1 can be an NPN transistor.

[0052] Furthermore, the leakage detection module 5 also includes a first resistor R1, a second resistor R2, a third resistor R3, a second capacitor C2 and a first detection device IC2;

[0053] Specifically, one end of the first resistor R1 is connected to the first output end of the first transformer ZCT and is connected to one end of the second capacitor C2 and the first end of the first detection device IC2 through the second resistor R2, the other end of the first resistor R1 is connected to the second output end of the first transformer ZCT and is connected to the other end of the second capacitor C2 and the second end of the first detection device IC2 through the third resistor R3, the eighth end of the first detection device IC2 is connected to the second end of the first regulator IC1, and the seventh end of the first detection device IC2 is connected to the signal processing module 6.

[0054] In a specific embodiment, the first detection device IC2 can use VG54123, and the leakage current induced by the first transformer ZCT is processed by the first resistor R1, the second resistor R2, the third resistor R3, and the second capacitor C2, so that the first detection device IC2 determines whether the processed signal exceeds the set leakage threshold, and then performs leakage judgment.

[0055] Further, the signal processing module 6 includes a third diode D3, a second diode D2, a first logic chip J1, a second switch tube V2, an eighth diode D8 and a second logic chip J2;

[0056] Specifically, the anode of the third diode D3 is connected to the B end of the second logic chip J2 and the seventh end of the first detection device IC2, the cathode of the third diode D3 is connected to the cathode of the second diode D2 and the B end of the first logic chip J1, the F end of the first logic chip J1 is connected to the anode of the second diode D2, the base of the first switch tube V1, the A end of the second logic chip J2, the IO3 end of the first controller U1 and the signal transmission module 8, the F end of the second logic chip J2 is connected to the IO6 end of the first controller U1 and the anode of the eighth diode D8, the A end of the first logic chip J1 is connected to the collector of the second switch tube V2 and is connected to the first end of the backup power supply through the fourth resistor, and the emitter of the second switch tube V2 is grounded.

[0057] In a specific embodiment, the first logic chip J1 and the second logic chip J2 can both be AND gate chips, and the first logic chip J1 and the second logic chip J2 can both be powered by a backup power supply, which will not be elaborated here. The first logic chip J1 cooperates with the second diode D2, the third diode D3 and the fourth resistor to perform self-locking processing on the high-level signal input to the B end of the first logic chip J1; the second switch tube V2 can be an NPN transistor, which can control the first logic chip J1 to stop the self-locking work.

[0058] Further, the signal transmission module 8 includes a signal acquisition device, a first analog switch U2, a fifth resistor R5, a first power supply VCC1, a sixth diode D6, a seventh diode D7, a fifth diode D5, a third capacitor C3, a third switch tube V3 and a fourth switch tube V4;

[0059] Specifically, the IN1 end and the IN2 end of the first analog switch U2 are both connected to the output end of the signal acquisition device, the OUT1 end of the first analog switch U2 is connected to the second receiving end of the power supply monitoring device, the OUT2 end of the first analog switch U2 is connected to the IO7 end of the first controller U1, the CTRL1 end of the first analog switch U2 is connected to the collector of the third switch tube V3 and is connected to the first power supply VCC1 through the fifth resistor R5, the base of the third switch tube V3 is connected to the F end of the first logic chip J1, the cathode of the sixth diode D6, the collector of the fourth switch tube V4 and the CTRL2 end of the first analog switch U2, the emitter of the fourth switch tube V4 and the emitter of the third switch tube V3 are both grounded, the base of the fourth switch tube V4 is connected to the cathode of the eighth diode D8 and the cathode of the fifth diode D5, the anode of the fifth diode D5 is connected to the cathode of the seventh diode D7 and is grounded through the third capacitor C3, and the anode of the seventh diode D7 is connected to the IO2 end of the first controller U1 and the anode of the sixth diode D6.

[0060] In a specific embodiment, the signal sampling device may be composed of a signal amplification conversion circuit composed of a voltage transformer, a current transformer and an operational amplifier, and the voltage transformer and the current transformer perform voltage and current sampling on the power supply end, and the signal amplification conversion circuit converts the current signal into a voltage signal and amplifies the signal; the first analog switch U2 may use a CD4066 chip; the third switch tube V3 and the fourth switch tube V4 may use NPN transistors; the fourth diode D4 and the fifth diode D5 perform unidirectional transmission control of electric energy, and the third capacitor C3 stores the electric energy transmitted by the fourth diode D4, and after the electric energy stored in the third capacitor C3 exceeds the conduction voltage of the fourth switch tube V4, the conduction of the fourth switch tube V4 is triggered.

[0061] In this embodiment, a power supply monitoring system is further provided. The power supply monitoring system includes the power supply protection circuit described in the embodiment of the present invention.

[0062] In a power supply monitoring system and a power supply protection circuit thereof according to the present embodiment, an input interface is used to connect AC power, a first relay switch K1-1 transmits the AC power through a first transformer B1, a first rectifier T1 and a first voltage regulator IC1 perform rectification and voltage stabilization on the transmitted power, and at the same time, the power transmitted by the first transformer B1 is transmitted to a power supply monitoring module 7 through a first mutual inductor ZCT, a signal sampling device samples the voltage and current of the power supply end and processes the sampled signal, and then transmits the processed signal to the IN1 end and the IN2 end of the first analog switch U2 through a data line, at which time the CTRL1 end of the first analog switch U2 is provided with a high-level signal by the fifth resistor R5 and the first power supply VCC1, and the IN1 end of the first analog switch U2 is The signal will be output by the OUT of the first analog switch U2 and transmitted to the power supply monitoring module 7, which will receive and process it. At this time, if the AC power connected to the input port is lower than the working power required by the power supply monitoring device, the IO2 end of the first controller U1 will output a second control signal and control the conduction state of the first thyristor S1 and the second thyristor S2. The backup power provided by the backup power supply is inverted by the first inverter T2 and then transmitted to the primary side of the first transformer B1 by the first thyristor S1 and the second thyristor S2, so that the power generated by the secondary side of the first transformer B1 is superimposed with the AC power connected to the input port to obtain the working power required by the power supply monitoring device. At this time, in order to avoid the power supply monitoring device sampling caused by voltage fluctuations Data is lost. When the backup power supply starts to perform superposition work, the second control signal will also control the third switch tube V3 to be turned on. The signal collected by the signal acquisition device is transmitted by the first analog switch U2 to the IO7 terminal of the first controller U1. The second control signal is transmitted to the third capacitor C3 through the fourth diode D4. After a period of time, that is, after the voltage stored in the third capacitor C3 reaches the conduction voltage of the fourth diode D4, the fourth switch tube V4 is turned on, and the power supply monitoring module 7 receives the electric energy transmitted by the first analog switch U2 again. The IO5 terminal of the first controller U1 transmits the received sampled signal to the power supply monitoring device, and the first mutual inductor ZCT performs leakage detection on the electric energy input to the power supply monitoring device. When leakage occurs, the first detection device IC2 The seventh terminal self-locks and outputs a high-level signal. The first logic chip J1 cooperates with the second diode D2, the third diode D3 and the fourth resistor to perform signal self-locking and outputs a high-level signal from the F terminal of the first logic chip J1. At this time, the first switch tube V1 is turned on, the first relay K1 is energized, and the first relay switch K1-1 is disconnected. At this time, the backup power supply will be connected to the power supply. The IO3 terminal of the first controller U1 receives the high-level signal output by the F terminal of the first logic chip J1, and then the IO1 terminal of the first controller U1 outputs the first control signal to control the fifth switch tube V5, the first thyristor S1 and the second thyristor S2 to turn on, the second relay K2 is energized and controls the second relay switch K2-1 to close, and then switches to the backup power supply for power supply control alone.When the power is switched, the first detection device IC2 loses power and stops the self-locking work, and when the IO1 end of the first controller U1 starts to output the first control signal, the first control signal controls the third switch tube V3 to turn on. Similarly, the first controller U1 receives the signal transmitted by the first analog switch U2, and after receiving, the first controller U1 transmits the received signal to the power supply monitoring device. However, if the first detection device IC2 still detects leakage when the backup power supply is powered separately, it means that the leakage position is between the first relay switch K1-1 and the power supply monitoring device. At this time, the F end of the second logic chip J2 will output a high-level signal. After receiving it, the IO6 end of the first controller U1 stops the backup power supply and stops the power supply monitoring device.

[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0064] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power protection circuit, characterized in that: The power protection circuit includes: a power control module, an intelligent control module, a backup source control module, a power processing module, a leakage detection module, a signal processing module, a power supply monitoring module and a signal transmission module; The power supply control module is connected to the backup source control module and the signal processing module, and is used to receive the AC power and transmit the AC power to the backup source control module, and stop transmitting the AC power when receiving the first protection signal output by the signal processing module; The intelligent control module is connected to the signal processing module, the power supply monitoring module and the signal transmission module, and is used to output a first control signal when receiving a first protection signal output by the signal processing module, process the sampling signal output by the signal transmission module and output a data signal, transmit the data signal to the power supply monitoring module when performing data interaction with the power supply monitoring module, output a second control signal when the AC power energy connected to the power supply module is at the working voltage required by the power supply monitoring module, output a reset signal when the signal processing module needs to be reset, and stop outputting the first control signal when receiving a second protection signal output by the signal processing module; The backup source control module is connected to the intelligent control module and the power supply monitoring module, and is used to receive AC power and provide backup power, invert the backup power and output the first power, directly output the first power when receiving the first control signal, and superimpose the first power with the AC power and output the second power when receiving the second control signal, and transmit the AC power, the first power or the second power to the power supply monitoring module; The power processing module is connected to the backup source control module, the power control module and the leakage detection module, and is used to rectify and stabilize the AC power, the first power or the second power output by the backup source control module and supply power to the power control module and the leakage detection module; The leakage detection module is connected to the power supply monitoring module, and is used to receive the electric energy output by the power supply processing module and perform leakage judgment on the AC electric energy, the first electric energy or the second electric energy input to the power supply monitoring module, and output a first leakage signal when leakage occurs; The signal processing module is connected to the backup power source control module and the leakage detection module, and is used to receive the backup power, perform self-locking processing on the first leakage signal and output the first protection signal, stop outputting the first protection signal when receiving the reset signal, and output the second protection signal when receiving the first protection signal and the first leakage signal at the same time; The signal transmission module is connected to the power supply monitoring module and the signal processing module, and is used to sample the voltage and current of the power supply end and transmit the sampled sampling signal to the power supply monitoring module, and transmit the sampled signal to the intelligent control module when receiving the first protection signal, the first control signal or the second control signal, and retransmit the sampled signal to the power supply monitoring module when receiving the second protection signal or the duration of receiving the first control signal or the second control signal exceeds the set timing time; The power supply monitoring module is used to receive AC power, the first power or the second power and store and process the sampling signal and the data signal.

2. A power protection circuit according to claim 1, characterized in that: The power supply control module includes an input port and a first relay switch; the backup source control module includes a first transformer; the leakage detection module includes a first mutual inductor; the power supply monitoring module includes a power supply monitoring device; the intelligent control module includes a first controller; The first end and the second end of the input port are respectively connected to the first moving end and the second moving end of the first relay switch, the fixed end of the first relay switch is connected to the first end of the secondary side of the first transformer, the second end of the secondary side of the first transformer and the second fixed end of the first relay switch both pass through the center of the first mutual inductor and are respectively connected to the first power supply end and the second power supply end of the power supply monitoring device, and the first receiving end of the power supply monitoring device is connected to the IO5 end of the first controller.

3. A power protection circuit according to claim 2, characterized in that: The backup source control module also includes a backup power supply, a first inverter, a first thyristor, a second thyristor, a second relay switch, a fifth switch tube, a second relay and a fourth diode; The moving end of the second relay switch is connected to the first fixed end of the first relay switch and the first end of the secondary side of the first transformer, the first end of the primary side of the first transformer is connected to one end of the first thyristor, the second end of the primary side of the first transformer is connected to one end of the second thyristor, the other end of the first thyristor and the other end of the second thyristor are respectively connected to the first output end and the second output end of the first inverter, the first end of the backup power supply is connected to the first input end of the first inverter and one end of the second relay, the second end of the backup power supply and the second input end of the first inverter are both grounded, the control end of the first thyristor and the control end of the second thyristor are both connected to the cathode of the fourth diode and the IO2 end of the first controller, the IO1 end of the first controller is connected to the anode of the fourth diode and the base of the fifth switch tube, the fixed end of the second relay switch is connected to the second fixed end of the first relay switch, the other end of the second relay is connected to the collector of the fifth switch tube, and the emitter of the fifth switch tube is grounded.

4. A power protection circuit according to claim 3, characterized in that: The power processing module includes a first rectifier, a first voltage stabilizer, a first diode and a first capacitor; the power control module also includes a first relay and a first switch tube; The first end and the second end of the first rectifier are respectively connected to the second end of the secondary side of the first transformer and the second fixed end of the first relay switch, the third end of the first rectifier is connected to the third end of the first voltage regulator, the second end of the first voltage regulator is connected to the anode of the first diode, the cathode of the first diode is connected to one end of the first capacitor and one end of the first relay, the other end of the first relay is connected to the collector of the first switch tube, the base of the first switch tube is connected to the signal processing module, and the emitter of the first switch tube, the other end of the first capacitor, the first end of the first voltage regulator and the fourth end of the first rectifier are all grounded.

5. A power protection circuit according to claim 4, characterized in that: The leakage detection module also includes a first resistor, a second resistor, a third resistor, a second capacitor and a first detection device; One end of the first resistor is connected to the first output end of the first mutual inductor and is connected to one end of the second capacitor and the first end of the first detection device through the second resistor, the other end of the first resistor is connected to the second output end of the first mutual inductor and is connected to the other end of the second capacitor and the second end of the first detection device through the third resistor, the eighth end of the first detection device is connected to the second end of the first regulator, and the seventh end of the first detection device is connected to the signal processing module.

6. A power protection circuit according to claim 5, characterized in that: The signal processing module includes a third diode, a second diode, a first logic chip, a second switch tube, an eighth diode and a second logic chip; The anode of the third diode is connected to the B end of the second logic chip and the seventh end of the first detection device, the cathode of the third diode is connected to the cathode of the second diode and the B end of the first logic chip, the F end of the first logic chip is connected to the anode of the second diode, the base of the first switch tube, the A end of the second logic chip, the IO3 end of the first controller and the signal transmission module, the F end of the second logic chip is connected to the IO6 end of the first controller and the anode of the eighth diode, the A end of the first logic chip is connected to the collector of the second switch tube and the first end of the backup power supply through the fourth resistor, and the emitter of the second switch tube is grounded.

7. A power protection circuit according to claim 6, characterized in that: The signal transmission module includes a signal acquisition device, a first analog switch, a fifth resistor, a first power supply, a sixth diode, a seventh diode, a fifth diode, a third capacitor, a third switch tube and a fourth switch tube; The IN1 and IN2 ends of the first analog switch are both connected to the output end of the signal acquisition device, the OUT1 end of the first analog switch is connected to the second receiving end of the power supply monitoring device, the OUT2 end of the first analog switch is connected to the IO7 end of the first controller, the CTRL1 end of the first analog switch is connected to the collector of the third switch tube and is connected to the first power supply through the fifth resistor, the base of the third switch tube is connected to the F end of the first logic chip, the cathode of the sixth diode, the collector of the fourth switch tube and the CTRL2 end of the first analog switch, the emitter of the fourth switch tube and the emitter of the third switch tube are both grounded, the base of the fourth switch tube is connected to the F end of the second logic chip and the cathode of the fifth diode, the anode of the fifth diode is connected to the cathode of the seventh diode and is grounded through the third capacitor, and the anode of the seventh diode is connected to the IO2 end of the first controller and the anode of the sixth diode.

8. A power supply monitoring system, characterized in that: The power supply monitoring system comprises the power supply protection circuit as described in any one of claims 1-7.

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