Intelligent electric equipment safety protection circuit
By designing a smart safety protection circuit in the power consumption equipment, and judging the stability of the power supply output by using voltage sampling and comparison thresholds, the problem of inaccurate judgment of the fluctuations in the power supply voltage in the prior art is solved, and the safety of power supply to the power consumption equipment is achieved promote.
Patent Information
- Application Number
- CN202411276180.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2024-12-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The safety protection circuit of existing electrical equipment cannot accurately judge the fluctuations in the power supply voltage, resulting in failure protection in time, which poses safety hazards.
A security protection circuit for smart power equipment was designed, including power supply module, switch control module, auxiliary power supply module, central control module, sampling control module, voltage comparison module, voltage status detection module, fault judgment module and protection control module, through Voltage sampling and comparison threshold setting determines whether the power output from the power supply is stable within the safe range, and power off protection is carried out in unstable situations.
It realizes accurate judgment and safety improvement of power supply for electrical equipment, can timely identify voltage fluctuations, and improve power supply safety.
Smart Images
Figure CN119134627A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of electrical equipment protection, and in particular to a safety protection circuit for intelligent electrical equipment. Background Art
[0002] As electrical equipment gradually becomes popular in people's daily lives, people have increasingly stringent requirements on the safety performance of electrical equipment. In order to ensure the safe operation of electrical equipment, electrical equipment in the prior art generally adopts a safety protection circuit composed of a comparator, a relay, etc., and judges the power supply status by judging the relationship between the provided electric energy and the set safety comparison threshold. Since the comparator cannot perform comparison when the signal voltages of the two groups of inputs are equal, it is impossible to accurately judge the fluctuation of the output power supply voltage, resulting in the inability to perform fault protection in time. There are certain safety hazards in the electrical equipment, and it is impossible to perform safety detection on the power supply end in advance, so there is room for improvement. Summary of the invention
[0003] An embodiment of the present invention provides a safety protection circuit for a smart electrical device to solve the problems raised in the above-mentioned background technology.
[0004] According to an embodiment of the present invention, a smart electrical equipment safety protection circuit is provided, comprising: a power supply module, a switch control module, an electrical equipment module, an auxiliary power supply module, a central control module, a sampling control module, a voltage comparison module, a voltage state detection module, a fault judgment module and a protection control module; A power module, used for receiving AC power, rectifying and regulating the AC power and outputting the first power; a switch control module connected to the power module, the protection control module and the power-consuming device module, and configured to transmit the first electric energy to the power-consuming device module upon receiving the first protection signal output by the protection control module; an auxiliary power supply module, connected to the protection control module and the fault judgment module, for providing a second electric energy and stopping providing the second electric energy upon receiving a first protection signal output by the protection control module or a first control signal output by the fault detection module; An electric device module, connected to the auxiliary power supply module, for receiving the first electric energy or the second electric energy and supplying power to the connected electric device, performing current sampling processing on the electric device and outputting a first sampling signal; A central control module is connected to the voltage state detection module, the power equipment module, the sampling control module and the voltage comparison module, and is used to receive the fault signal output by the voltage state detection module, output a first pulse signal and control the sampling work of the sampling control module when receiving the first sampling signal, and output a second pulse signal to adjust the voltage value of the comparison threshold set by the voltage comparison module; A sampling control module, connected to the power module, configured to receive the first pulse signal and perform voltage sampling processing on the first electric energy, and output a second sampling signal; A voltage comparison module, connected to the sampling module, for receiving the second pulse signal and setting a comparison threshold, outputting a first level signal when the comparison threshold is greater than the second sampling signal, and outputting a second level signal when the comparison threshold is less than the second sampling signal; A voltage state detection module, connected to the voltage control module and the voltage comparison module, for performing a difference calculation between a comparison threshold and a second sampling signal and outputting a first difference signal when a first level signal is received, performing a difference calculation between a second sampling signal and a comparison threshold and outputting a second difference signal when a second level signal is received, and outputting a fault signal when the first difference signal or the second difference signal is greater than a set difference threshold; A fault judgment module is connected to the voltage state detection module and the electric equipment module, and is used to output a first control signal when a fault signal is received, and output a second control signal when no fault signal is received and the first sampling signal is detected in isolation; The protection control module is connected to the fault judgment module and is used to set a timing time, and output a first protection signal when the duration of the received second control signal exceeds the timing time, and stop outputting the first protection signal when the first control signal is received.
[0005] As a further solution of the present invention: the power module includes a power interface and an electric energy conversion device; the switch control module includes a first control switch; the power device module includes a power device interface and a thirteenth resistor; Preferably, the first end and the second end of the power supply interface are respectively connected to the first end and the second end of the electric energy conversion device, the third end of the electric energy conversion device is connected to the moving end of the first control switch, the moving and static ends of the first control switch are connected to the first end of the electrical equipment interface, the second end of the electrical equipment is connected to the first end of the thirteenth resistor, and the fourth end of the electric energy conversion device and the second end of the thirteenth resistor are both grounded.
[0006] As a further solution of the present invention: the sampling control module includes a first field effect transistor, a first resistor and a second resistor; the voltage comparison module includes a first voltage stabilizing source, a third resistor, a fourth resistor, a first comparator, a second field effect transistor and a first inverter; the central control module includes a central processing unit; Preferably, the drain of the first field effect transistor is connected to the third end of the electric energy conversion device, the source of the first field effect transistor is connected to the inverting end of the first comparator and the first end of the second resistor through the first resistor, the drain of the second field effect transistor is connected to the first voltage stabilizing source through the third resistor, the source of the second field effect transistor is connected to the inverting end of the first comparator and the first end of the fourth resistor, the second end of the second resistor and the second end of the fourth resistor are both connected to the fourth end of the electric energy conversion device, the output end of the first comparator is connected to the input end of the first inverter, the output end of the first inverter is connected to the voltage state detection module, and the gate of the first field effect transistor and the gate of the second field effect transistor are respectively connected to the IO1 end and IO2 end of the central processing unit.
[0007] As a further solution of the present invention: the voltage state detection module includes a signal transmission device, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first operational amplifier, a ninth resistor and a first diode; Preferably, the first end and the third end of the signal transmission device are both connected to the inverting end of the first comparator, the twelfth end and the thirteenth end of the signal transmission device are both connected to the output end of the first comparator, the eighth end and the tenth end of the signal transmission device are both connected to the non-inverting end of the first comparator, the fifth end and the sixth end of the signal transmission device are both connected to the output end of the first inverter, the second end and the fourth end of the signal transmission device are both connected to the inverting end of the first operational amplifier and one end of the seventh resistor through the fifth resistor, the ninth end and the eleventh end of the signal transmission device are both connected to the non-inverting end of the first operational amplifier and one end of the eighth resistor through the sixth resistor, the other end of the eighth resistor is grounded, the output end of the first operational amplifier is connected to the other end of the seventh resistor and the cathode of the first diode, the anode of the first diode is connected to the fault judgment module and connected to the IO3 end of the central processing unit through the ninth resistor.
[0008] As a further solution of the present invention: the fault judgment module includes a tenth resistor, a first transistor, a twelfth resistor, an eleventh resistor, a second transistor, a first logic element, an eighteenth resistor, a third diode, a second voltage regulator and an optical coupling element; Preferably, the base of the first transistor is connected to the anode of the first diode and the base of the second transistor and is grounded through a tenth resistor, the collector of the first transistor is connected to the A end of the first logic element and is connected to the third end of the electric energy conversion device and the collector of the second transistor through a twelfth resistor, the emitter of the second transistor is connected to the anode of the third diode, the first end of the eleventh resistor and the protection control module, the B end of the first logic element is connected to the fourth end of the optocoupler element and is grounded through an eighteenth resistor, the third end of the optocoupler element is connected to the second voltage stabilizing source, the first end of the optocoupler element is connected to the first end of the thirteenth resistor, the second end of the optocoupler element, the second end of the eleventh resistor and the emitter of the first transistor are all grounded, and the cathode of the third diode is connected to the auxiliary power supply module.
[0009] As a further solution of the present invention: the protection control module includes a fourth voltage stabilizing source, a fourth transistor, a fourteenth resistor, a first capacitor, a fifteenth resistor and a fifth transistor; the switch control module also includes a third voltage stabilizing source, a first relay and a third transistor; Preferably, the base of the fourth transistor is connected to the F end of the first logic element, the collector of the fourth transistor is connected to the fourth voltage-stabilizing source, the emitter of the fourth transistor is connected to one end of the fourteenth resistor and one end of the first capacitor and is connected to the collector of the fifth transistor, the base of the third transistor and the auxiliary power supply module through the fifteenth resistor, the emitter of the third transistor, the emitter of the fifth transistor, the other end of the first capacitor and the other end of the fourteenth resistor are all grounded, the base of the fifth transistor is connected to the first end of the eleventh resistor, the collector of the third transistor is connected to one end of the first relay, and the other end of the first relay is connected to the third voltage-stabilizing source.
[0010] As a further solution of the present invention: the auxiliary power supply module includes a power supply device, a sixteenth resistor, a third field effect transistor, a seventeenth resistor, a sixth triode and a second diode; Preferably, the first end of the power supply device is connected to the drain of the third field effect transistor and connected to the gate of the third field effect transistor and the collector of the sixth transistor through a sixteenth resistor, the source of the third field effect transistor is connected to the first end of the electrical equipment interface through a seventeenth resistor, the emitter of the sixth transistor and the second end of the power supply device are both grounded, the base of the sixth transistor is connected to the cathode of the third diode and the cathode of the second diode, and the anode of the second diode is connected to the collector of the fifth transistor.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the intelligent electrical equipment safety protection circuit of the present invention is composed of an auxiliary power supply module cooperating with the electrical equipment module to determine whether it is connected to the electrical equipment, and after the electrical equipment is connected, the central control module controls the sampling control module to perform voltage sampling, and controls the voltage comparison module to set the comparison threshold and perform voltage comparison, so that the voltage state detection module can determine whether the electric energy output by the power supply module is stable within a safe range. After the stable duration of the electric energy output by the power supply module exceeds the timing time set by the protection control module, the switch control module is controlled to supply power to the electrical equipment module and the auxiliary power supply module is stopped. If the electric energy becomes unstable, the switch control module and the auxiliary power supply module both perform power-off protection, which can accurately determine the voltage fluctuation state and improve the power supply safety of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] 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.
[0013] Figure 1 A schematic block diagram of a safety protection circuit for a smart electrical device provided in accordance with an embodiment of the present invention.
[0014] Figure 2 A circuit diagram of a safety protection circuit for a smart electrical device provided in an embodiment of the present invention.
[0015] Figure 3 A circuit diagram of a protection control module provided in an embodiment of the present invention.
[0016] Figure 4 A circuit diagram of an auxiliary power supply module provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0017] 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.
[0018] In one embodiment, see Figure 1 , a smart electrical equipment safety protection circuit, comprising: a power supply module 1, a switch control module 2, an electrical equipment module 3, an auxiliary power supply module 4, a central control module 5, a sampling control module 6, a voltage comparison module 7, a voltage state detection module 8, a fault judgment module 9 and a protection control module 10; Specifically, the power module 1 is used to receive AC power, rectify and regulate the AC power and output the first power; The switch control module 2 is connected to the power module 1, the protection control module 10 and the power-consuming device module 3, and is used to transmit the first electric energy to the power-consuming device module 3 when receiving the first protection signal output by the protection control module 10; The auxiliary power supply module 4 is connected to the protection control module 10 and the fault judgment module 9, and is used to provide the second electric energy and stop providing the second electric energy when receiving the first protection signal output by the protection control module 10 or the first control signal output by the fault detection module; The power consumption device module 3 is connected to the auxiliary power supply module 4, and is used to receive the first electric energy or the second electric energy and supply power to the connected power consumption device, perform current sampling processing on the power consumption device and output a first sampling signal; The central control module 5 is connected to the voltage state detection module 8, the electrical equipment module 3, the sampling control module 6 and the voltage comparison module 7, and is used to receive the fault signal output by the voltage state detection module 8, and when receiving the first sampling signal, output a first pulse signal and control the sampling work of the sampling control module 6, and output a second pulse signal to adjust the voltage value of the comparison threshold set by the voltage comparison module 7; A sampling control module 6, connected to the power module 1, for receiving the first pulse signal and performing voltage sampling processing on the first electric energy, and outputting a second sampling signal; A voltage comparison module 7, connected to the sampling module, for receiving the second pulse signal and setting a comparison threshold, outputting a first level signal when the comparison threshold is greater than the second sampling signal, and outputting a second level signal when the comparison threshold is less than the second sampling signal; A voltage state detection module 8 is connected to the voltage control module and the voltage comparison module 7, and is used to calculate the difference between the comparison threshold and the second sampling signal and output the first difference signal when receiving the first level signal, and calculate the difference between the second sampling signal and the comparison threshold and output the second difference signal when receiving the second level signal, and output a fault signal when the first difference signal or the second difference signal is greater than the set difference threshold; A fault judgment module 9 is connected to the voltage state detection module 8 and the electric equipment module 3, and is used to output a first control signal when a fault signal is received, and output a second control signal when no fault signal is received and the first sampling signal is detected in isolation; The protection control module 10 is connected to the fault judgment module 9, and is used to set a timing time, and output a first protection signal when the duration of the received second control signal exceeds the timing time, and stop outputting the first protection signal when the first control signal is received.
[0019] In a specific embodiment, the power supply module 1 may adopt a power supply circuit composed of a power supply interface and an electric energy conversion device T1, which may be connected to AC power and perform AC-DC rectification and DC-DC regulation on the AC power; the switch control module 2 may adopt a switch control circuit composed of relays, transistors, power supplies, etc., which may control the transmission state of electric energy; the power consumption device module 3 may adopt a power consumption device circuit composed of a power consumption device interface and a resistor, which may be connected to the power consumption device and perform current sampling on the power consumption device; the auxiliary power supply module 4 may adopt an auxiliary power supply circuit composed of a power supply device, a field effect transistor, a transistor, etc., which may provide the second electric energy required for detecting the connection between the power consumption device module 3 and the power consumption device; the central control module 5 may adopt a central 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 functions such as signal processing, data storage, module control, and timing control; the sampling control module 6 may adopt a sampling control circuit composed of a resistor and a field effect transistor, which may perform voltage sampling on the power supply module 1; the voltage comparison Module 7 may adopt a voltage comparison circuit composed of a comparator, a field effect transistor, an inverter, a resistor, etc., and may set a comparison threshold value. The voltage value of the comparison threshold value is the voltage value of the second sampling signal output by the sampling control module 6 when the output voltage of the power module 1 is stable, and the voltage of the comparison threshold value is compared with the voltage of the signal output by the sampling control module 6; the voltage state detection module 8 may adopt a voltage state detection circuit composed of an analog switch, a resistor, an operational amplifier, etc., and may calculate the difference between the comparison threshold values set by the sampling control module 6 and the voltage comparison module 7, and detect whether the difference exceeds the set difference threshold value, and the difference threshold value is the allowed change value of the signal output by the sampling control module 6; the fault judgment module 9 may adopt a fault judgment circuit composed of a transistor, a logic element, a photoelectric coupler, etc., and may judge the connection state of the electrical equipment, and control the working state of the protection control module 10 and the auxiliary power supply module 4 according to the signal state output by the voltage state detection module 8; the protection control module 10 may adopt a protection control circuit composed of a transistor, a resistor, a capacitor, etc. to realize timing control and rapid control.
[0020] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The power module 1 includes a power interface and an electric energy conversion device T1; the switch control module 2 includes a first control switch K1-1; the power device module 3 includes a power device interface and a thirteenth resistor R13; Specifically, the first end and the second end of the power interface are respectively connected to the first end and the second end of the power conversion device T1, the third end of the power conversion device T1 is connected to the moving end of the first control switch K1-1, the moving and static ends of the first control switch K1-1 are connected to the first end of the electrical equipment interface, the second end of the electrical equipment is connected to the first end of the thirteenth resistor R13, and the fourth end of the power conversion device T1 and the second end of the thirteenth resistor R13 are both grounded.
[0021] In a specific embodiment, the electric energy conversion device T1 may be composed of a controllable rectifier; the first control switch K1 - 1 may be a normally open switch; and the thirteenth resistor R13 is used as a current sampling resistor.
[0022] Further, the sampling control module 6 includes a first field effect transistor Q1, a first resistor R1 and a second resistor R2; the voltage comparison module 7 includes a first voltage regulator VCC1, a third resistor R3, a fourth resistor R4, a first comparator A1, a second field effect transistor Q2 and a first inverter J1; the central control module 5 includes a central processor U1; Specifically, the drain of the first field effect transistor Q1 is connected to the third end of the electric energy conversion device T1, the source of the first field effect transistor Q1 is connected to the inverting end of the first comparator A1 and the first end of the second resistor R2 through the first resistor R1, the drain of the second field effect transistor Q2 is connected to the first voltage regulator VCC1 through the third resistor R3, the source of the second field effect transistor Q2 is connected to the non-inverting end of the first comparator A1 and the first end of the fourth resistor R4, the second end of the second resistor R2 and the second end of the fourth resistor R4 are both connected to the fourth end of the electric energy conversion device T1, the output end of the first comparator A1 is connected to the input end of the first inverter J1, the output end of the first inverter J1 is connected to the voltage state detection module 8, and the gate of the first field effect transistor Q1 and the gate of the second field effect transistor Q2 are respectively connected to the IO1 end and IO2 end of the central processing unit U1.
[0023] In a specific embodiment, the first field effect transistor Q1 may be an N-channel field effect transistor, which is controlled by a central controller and controls the first resistor R1 and the second resistor R2 to perform voltage sampling; the central controller may be an STM32 single-chip microcomputer; the second field effect transistor Q2 may be an N-channel field effect transistor, which cooperates with the first voltage regulator VCC1, the third resistor R3 and the fourth resistor R4 to set the comparison threshold; the first comparator A1 may be an LM358 comparator; the first inverter J1 may be a NOT gate chip.
[0024] Further, the voltage state detection module 8 includes a signal transmission device IC1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first operational amplifier OP1, a ninth resistor R9 and a first diode D1; Specifically, the first end and the third end of the signal transmission device IC1 are both connected to the inverting end of the first comparator A1, the twelfth end and the thirteenth end of the signal transmission device IC1 are both connected to the output end of the first comparator A1, the eighth end and the tenth end of the signal transmission device IC1 are both connected to the non-inverting end of the first comparator A1, the fifth end and the sixth end of the signal transmission device IC1 are both connected to the output end of the first inverter J1, the second end and the fourth end of the signal transmission device IC1 are both connected to the inverting end of the first operational amplifier OP1 and one end of the seventh resistor R7 through the fifth resistor R5, the ninth end and the eleventh end of the signal transmission device IC1 are both connected to the non-inverting end of the first operational amplifier OP1 and one end of the eighth resistor R8 through the sixth resistor R6, the other end of the eighth resistor R8 is grounded, the output end of the first operational amplifier OP1 is connected to the other end of the seventh resistor R7 and the cathode of the first diode D1, the anode of the first diode D1 is connected to the fault judgment module 9 and is connected to the IO3 end of the central processing unit U1 through the ninth resistor R9.
[0025] In a specific embodiment, the signal transmission device IC1 may use a CD4066 chip; the first operational amplifier OP1 may use an OP07 operational amplifier, and cooperate with the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 to perform difference calculation on the input signal; the first diode D1 sets the difference threshold.
[0026] Further, the fault judgment module 9 includes a tenth resistor R10, a first transistor V1, a twelfth resistor R12, an eleventh resistor R11, a second transistor V2, a first logic element J2, an eighteenth resistor R18, a third diode D3, a second voltage regulator VCC2 and an optocoupler element U2; Specifically, the base of the first transistor V1 is connected to the anode of the first diode D1 and the base of the second transistor V2 and is grounded through the tenth resistor R10, the collector of the first transistor V1 is connected to the A end of the first logic element J2 and is connected to the third end of the electric energy conversion device T1 and the collector of the second transistor V2 through the twelfth resistor R12, the emitter of the second transistor V2 is connected to the anode of the third diode D3, the first end of the eleventh resistor R11 and the protection control module 10, the B end of the first logic element J2 is connected to the fourth end of the optocoupler element U2 and is grounded through the eighteenth resistor R18, the third end of the optocoupler element U2 is connected to the second voltage regulator source VCC2, the first end of the optocoupler element U2 is connected to the first end of the thirteenth resistor R13, the second end of the optocoupler element U2, the second end of the eleventh resistor R11 and the emitter of the first transistor V1 are all grounded, and the cathode of the third diode D3 is connected to the auxiliary power supply module 4.
[0027] In a specific embodiment, the first transistor V1 and the second transistor V2 can be NPN transistors; the first logic element J2 can be an AND gate chip; and the optical coupling element U2 can be a PC817 photoelectric coupler.
[0028] Further, the protection control module 10 includes a fourth voltage stabilizing source VCC4, a fourth transistor V4, a fourteenth resistor R14, a first capacitor C1, a fifteenth resistor R15 and a fifth transistor V5; the switch control module 2 also includes a third voltage stabilizing source VCC3, a first relay K1 and a third transistor V3; Specifically, the base of the fourth transistor V4 is connected to the F end of the first logic element J2, the collector of the fourth transistor V4 is connected to the fourth voltage stabilizing source VCC4, the emitter of the fourth transistor V4 is connected to one end of the fourteenth resistor R14 and one end of the first capacitor C1 and is connected to the collector of the fifth transistor V5, the base of the third transistor V3 and the auxiliary power supply module 4 through the fifteenth resistor R15, the emitter of the third transistor V3, the emitter of the fifth transistor V5, the other end of the first capacitor C1 and the other end of the fourteenth resistor R14 are all grounded, the base of the fifth transistor V5 is connected to the first end of the eleventh resistor R11, the collector of the third transistor V3 is connected to one end of the first relay K1, and the other end of the first relay K1 is connected to the third voltage stabilizing source VCC3.
[0029] In a specific embodiment, the fourth transistor V4 and the fifth transistor V5 can both be NPN transistors; the first capacitor C1 can be a storage capacitor to store electrical energy and trigger the conduction of the third transistor V3 when the stored electrical energy reaches the conduction voltage of the third transistor V3; the first relay K1 controls the closing operation of the first control switch K1-1 by magnetic attraction.
[0030] Further, the auxiliary power supply module 4 includes a power supply device, a sixteenth resistor R16, a third field effect transistor Q3, a seventeenth resistor R17, a sixth transistor D6 and a second diode D2; Specifically, the first end of the power supply device is connected to the drain of the third field effect transistor Q3 and connected to the gate of the third field effect transistor Q3 and the collector of the sixth transistor D6 through the sixteenth resistor R16, the source of the third field effect transistor Q3 is connected to the first end of the electrical equipment interface through the seventeenth resistor R17, the emitter of the sixth transistor D6 and the second end of the power supply device are both grounded, the base of the sixth transistor D6 is connected to the cathode of the third diode D3 and the cathode of the second diode D2, and the anode of the second diode D2 is connected to the collector of the fifth transistor V5.
[0031] In a specific embodiment, the power supply device may be a lithium battery pack; the third field effect transistor Q3 may be an N-channel field effect transistor; and the sixth transistor D6 may be an NPN transistor.
[0032] In a safety protection circuit for a smart electric device in this embodiment, the power interface is connected to the AC power, and the power conversion device T1 performs rectification and regulation on the AC power. At this time, the power supply device supplies power, and the third field effect transistor Q3 and the seventeenth resistor R17 transmit the power to the first end of the electric device interface. When the electric device interface is connected to the electric device, the thirteenth resistor R13 will perform current sampling, the optical coupling element U2 will be turned on, the IO4 end of the central processor U1 will become a high level, and the IO1 end of the central processor U1 will control the first field effect transistor Q1 to be turned on, and cooperate with the first resistor R1 and the second resistor R2 to perform voltage The second sampling signal is sampled and output, and at the same time, the IO2 terminal of the central processor U1 controls the second field effect tube Q2 to be turned on, and cooperates with the first voltage regulator VCC1, the third resistor R3 and the fourth resistor R4 to set the comparison threshold. The voltage value of the comparison threshold is the voltage value of the second sampling signal output by the sampling control module 6 when the output voltage of the power module 1 is stable. Since the voltage output by the power module 1 cannot be stabilized at a fixed voltage value at all times, there is a certain voltage fluctuation. When the second sampling signal is greater than the comparison threshold, the first comparator A1 outputs a high level and controls the twelfth and thirteenth terminals of the signal transmission device IC1. The first terminal and the second terminal of the signal transmission device IC1 are turned on, and the tenth terminal and the eleventh terminal are turned on, so that the first operational amplifier OP1 cooperates with the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 to perform subtraction processing on the second sampling signal and the comparison threshold. When the comparison threshold is greater than the second sampling signal, the signal transmission device IC1 switches the signal transmission path so that the comparison threshold is subtracted from the second sampling signal. When the difference does not exceed the difference threshold set by the first diode D1, the A terminal of the first logic element J2 is high level, and the F terminal of the first logic element J2 controls the fourth The transistor V4 is turned on, and the first capacitor C1 stores energy. After a certain period of time, the third transistor V3 is triggered to turn on, the first relay K1 is energized and controls the first control switch K1-1 to close, controls the sixth transistor D6 to turn on, and the third field effect transistor Q3 is turned off, and the power supply is normal. When the difference exceeds the difference threshold, the first diode D1 is broken down, the first transistor V1 and the second transistor V2 are both turned on, the IO3 terminal of the central controller becomes a high level, the fifth transistor V5 and the sixth transistor D6 are both turned on, the third transistor V3 will be turned off, the power supply device stops supplying power, and the first control switch K1-1 is disconnected for power-off protection.
[0033] 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.
[0034] 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 safety protection circuit for smart electrical equipment, characterized in that: The smart electrical equipment safety protection circuit includes: a power supply module, a switch control module, an electrical equipment module, an auxiliary power supply module, a central control module, a sampling control module, a voltage comparison module, a voltage state detection module, a fault judgment module and a protection control module; The power supply module is used to receive AC power, rectify and regulate the AC power and output the first power; The switch control module is connected to the power module, the protection control module and the power-consuming device module, and is used to transmit the first electric energy to the power-consuming device module upon receiving the first protection signal output by the protection control module; The auxiliary power supply module is connected to the protection control module and the fault judgment module, and is used to provide the second electric energy and stop providing the second electric energy when receiving the first protection signal output by the protection control module or the first control signal output by the fault detection module; The power consumption device module is connected to the auxiliary power supply module, and is used to receive the first electric energy or the second electric energy and supply power to the connected power consumption device, perform current sampling processing on the power consumption device and output a first sampling signal; The central control module is connected to the voltage state detection module, the power equipment module, the sampling control module and the voltage comparison module, and is used to receive the fault signal output by the voltage state detection module, output a first pulse signal and control the sampling work of the sampling control module when receiving the first sampling signal, and output a second pulse signal to adjust the voltage value of the comparison threshold set by the voltage comparison module; The sampling control module is connected to the power supply module, and is used to receive the first pulse signal and perform voltage sampling processing on the first electric energy, and output a second sampling signal; The voltage comparison module is connected to the sampling module, and is used to receive the second pulse signal and set a comparison threshold, and output a first level signal when the comparison threshold is greater than the second sampling signal, and output a second level signal when the comparison threshold is less than the second sampling signal; The voltage state detection module is connected to the voltage control module and the voltage comparison module, and is used to calculate the difference between the comparison threshold and the second sampling signal and output the first difference signal when receiving the first level signal, calculate the difference between the second sampling signal and the comparison threshold and output the second difference signal when receiving the second level signal, and output a fault signal when the first difference signal or the second difference signal is greater than the set difference threshold; The fault judgment module is connected to the voltage state detection module and the power-consuming device module, and is used to output a first control signal when a fault signal is received, and output a second control signal when no fault signal is received and the first sampling signal is detected in isolation; The protection control module is connected to the fault judgment module, and is used to set a timing time, and output a first protection signal when the duration of the received second control signal exceeds the timing time, and stop outputting the first protection signal when the first control signal is received.
2. The smart electrical equipment safety protection circuit according to claim 1, characterized in that: The power supply module includes a power supply interface and an electric energy conversion device; the switch control module includes a first control switch; the power consumption device module includes a power consumption device interface and a thirteenth resistor; The first end and the second end of the power interface are connected to the first end and the second end of the electric energy conversion device respectively, the third end of the electric energy conversion device is connected to the moving end of the first control switch, the moving and static ends of the first control switch are connected to the first end of the electrical equipment interface, the second end of the electrical equipment is connected to the first end of the thirteenth resistor, and the fourth end of the electric energy conversion device and the second end of the thirteenth resistor are both grounded.
3. A smart electrical equipment safety protection circuit according to claim 2, characterized in that: The sampling control module includes a first field effect tube, a first resistor and a second resistor; the voltage comparison module includes a first voltage stabilizing source, a third resistor, a fourth resistor, a first comparator, a second field effect tube and a first inverter; the central control module includes a central processing unit; The drain of the first field effect tube is connected to the third end of the electric energy conversion device, the source of the first field effect tube is connected to the inverting end of the first comparator and the first end of the second resistor through the first resistor, the drain of the second field effect tube is connected to the first voltage stabilizing source through the third resistor, the source of the second field effect tube is connected to the non-inverting end of the first comparator and the first end of the fourth resistor, the second end of the second resistor and the second end of the fourth resistor are both connected to the fourth end of the electric energy conversion device, the output end of the first comparator is connected to the input end of the first inverter, the output end of the first inverter is connected to the voltage state detection module, and the gate of the first field effect tube and the gate of the second field effect tube are respectively connected to the IO1 end and IO2 end of the central processing unit.
4. The smart electrical equipment safety protection circuit according to claim 3 is characterized in that: The voltage state detection module includes a signal transmission device, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first operational amplifier, a ninth resistor and a first diode; The first end and the third end of the signal transmission device are both connected to the inverting end of the first comparator, the twelfth end and the thirteenth end of the signal transmission device are both connected to the output end of the first comparator, the eighth end and the tenth end of the signal transmission device are both connected to the non-inverting end of the first comparator, the fifth end and the sixth end of the signal transmission device are both connected to the output end of the first inverter, the second end and the fourth end of the signal transmission device are both connected to the inverting end of the first operational amplifier and one end of the seventh resistor through the fifth resistor, the ninth end and the eleventh end of the signal transmission device are both connected to the non-inverting end of the first operational amplifier and one end of the eighth resistor through the sixth resistor, the other end of the eighth resistor is grounded, the output end of the first operational amplifier is connected to the other end of the seventh resistor and the cathode of the first diode, the anode of the first diode is connected to the fault judgment module and connected to the IO3 end of the central processing unit through the ninth resistor.
5. The smart electrical equipment safety protection circuit according to claim 4, characterized in that: The fault judgment module includes a tenth resistor, a first transistor, a twelfth resistor, an eleventh resistor, a second transistor, a first logic element, an eighteenth resistor, a third diode, a second voltage stabilizing source and an optical coupling element; The base of the first transistor is connected to the anode of the first diode and the base of the second transistor and is grounded through the tenth resistor, the collector of the first transistor is connected to the A end of the first logic element and is connected to the third end of the electric energy conversion device and the collector of the second transistor through the twelfth resistor, the emitter of the second transistor is connected to the anode of the third diode, the first end of the eleventh resistor and the protection control module, the B end of the first logic element is connected to the fourth end of the optocoupler element and is grounded through the eighteenth resistor, the third end of the optocoupler element is connected to the second voltage stabilizing source, the first end of the optocoupler element is connected to the first end of the thirteenth resistor, the second end of the optocoupler element, the second end of the eleventh resistor and the emitter of the first transistor are all grounded, and the cathode of the third diode is connected to the auxiliary power supply module.
6. A smart electrical equipment safety protection circuit according to claim 5, characterized in that: The protection control module includes a fourth voltage stabilizing source, a fourth transistor, a fourteenth resistor, a first capacitor, a fifteenth resistor and a fifth transistor; the switch control module also includes a third voltage stabilizing source, a first relay and a third transistor; The base of the fourth transistor is connected to the F end of the first logic element, the collector of the fourth transistor is connected to the fourth voltage-stabilizing source, the emitter of the fourth transistor is connected to one end of the fourteenth resistor and one end of the first capacitor and is connected to the collector of the fifth transistor, the base of the third transistor and the auxiliary power supply module through the fifteenth resistor, the emitter of the third transistor, the emitter of the fifth transistor, the other end of the first capacitor and the other end of the fourteenth resistor are all grounded, the base of the fifth transistor is connected to the first end of the eleventh resistor, the collector of the third transistor is connected to one end of the first relay, and the other end of the first relay is connected to the third voltage-stabilizing source.
7. A smart electrical equipment safety protection circuit according to claim 6, characterized in that: The auxiliary power supply module includes a power supply device, a sixteenth resistor, a third field effect transistor, a seventeenth resistor, a sixth triode and a second diode; The first end of the power supply device is connected to the drain of the third field effect transistor and is connected to the gate of the third field effect transistor and the collector of the sixth transistor through the sixteenth resistor. The source of the third field effect transistor is connected to the first end of the electrical equipment interface through the seventeenth resistor. The emitter of the sixth transistor and the second end of the power supply device are both grounded. The base of the sixth transistor is connected to the cathode of the third diode and the cathode of the second diode. The anode of the second diode is connected to the collector of the fifth transistor.