High-safety self-checking electric heating water blanket hot water circuit and device

Abstract

The invention provides a high-safety self-checking electric heating blanket water heating circuit and device, and relates to the technical field of electric blanket circuits, and the high-safety self-checking electric heating blanket water heating circuit comprises a power supply management module which is used for being connected with an external direct current power supply and providing power supply guarantee for the whole circuit; and the resonance module comprises a first MOS (Metal Oxide Semiconductor) tube VT1, a second MOS tube VT2, a third MOS tube VT3, a fourth MOS tube VT4, a resonance inductor L and a resonance capacitor C. According to the circuit and the device, through integrating over-current, under-voltage, over-voltage and water shortage protection circuits, the equipment state is monitored in real time, the circuit is rapidly cut off or an alarm is given in case of abnormity, and the safety is improved. The resonance module efficiently converts direct current into high-frequency alternating current through an H-bridge circuit, water is rapidly heated, and energy is saved. The delay starting circuit ensures that the circuit is prevented from being damaged by instant large current when equipment is connected, starting stability is enhanced, and service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of electric blanket circuits, in particular to a high-safety self-checking electric hot water blanket hot water circuit and device. Background Art

[0002] With the improvement of people's living standards and the advancement of science and technology, household electric heating products are increasingly used in daily life. As a comfortable heating device, electric water blankets are favored by consumers because of their convenience and efficiency. The main function of electric water blankets is to heat water through internal electric heating elements to provide a warm bed or other comfortable environment. However, traditional electric water blankets often face the following technical challenges and safety hazards in the design and use process.

[0003] First, traditional electric hot water blankets usually use simple electric heating elements for heating, lacking comprehensive safety protection measures. These devices are prone to problems such as overcurrent, overvoltage or undervoltage when working for a long time or encountering unstable power supply, which may cause circuit damage, equipment failure, and even serious accidents such as fire. Second, common electric blankets use IGBT architecture for heating. With long-term use, the electric-heat conversion rate of this architecture is relatively low, which may lead to defects such as high power consumption and insufficient energy saving. Summary of the invention

[0004] The present invention aims to solve the shortcomings existing in the background technology, provide a high-safety self-checking electric water blanket hot water circuit and device, and improve multiple safety protection measures for the hot water direction of the electric water blanket, so as to achieve optimization and breakthroughs in energy conversion efficiency, intelligent control, thermal management and fault detection.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a highly secure self-checking electric hot water blanket hot water circuit, comprising: a power management module, the power management module is used to connect an external DC power supply and provide power supply guarantee for the entire circuit; a resonance module, the resonance module comprises: a first MOS tube VT1, a second MOS tube VT2, a third MOS tube VT3, a fourth MOS tube VT4, a resonant inductor L and a resonant capacitor C. After the resonance module is powered on, the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 alternately conduct the resonant inductor L and generate a high-frequency sinusoidal current, and the high-frequency sinusoidal current drives the load to quickly heat the water for the electric hot water blanket; a driving module, the driving module is used to power and drive multiple MOS tubes in the resonance module to open and close; a signal control module, the components in the signal control module are distributed throughout the circuit, and are used for signal conduction and control of the auxiliary circuit; a detection and protection module, the detection and protection module is used to monitor the working condition of the entire circuit and cooperate with the power management module to manage the circuit on and off; a feedback module, the feedback module is used to cooperate with the detection and protection module to record faults and make corresponding fault feedback.

[0006] Furthermore, the power management module includes: a DC power supply, a fuse FU, a varistor V, a main circuit switch KA1, a fault circuit switch KA2, a sampling resistor RL and a Zener diode Z17. The DC power supply and the fuse FU, the sampling resistor RL, the main circuit switch KA1, and the fault circuit switch KA2 are connected in series to form a power supply circuit, and the sampling resistor RL and the Zener diode Z17 are connected in parallel in the above-mentioned power supply circuit.

[0007] Furthermore, the power management module also includes a delayed start circuit, which includes: the delayed start circuit includes an operational amplifier U5, a delay capacitor E1, a driving transistor Q2, a relay KA1, a voltage regulator diode Z12 and a light-emitting diode LED9; the positive input end of the operational amplifier U5 is connected to the positive electrode of the delay capacitor E1, and the negative input end is connected to the ground; the positive electrode of the delay capacitor E1 is connected to the positive electrode of the power supply through a first resistor R7, and the positive electrode of the delay capacitor E1 is also connected to the negative input end of the operational amplifier U5 through a second resistor R27, the output end of the operational amplifier U5 is connected to the base of the driving transistor Q2, the collector of the driving transistor Q2 is connected to one end of the relay KA1, the emitter of the driving transistor Q2 is connected to the ground, the other end of the relay KA1 is connected to the positive electrode of the power supply through a current limiting resistor R26, and through the light-emitting diode LED9 and the voltage regulator diode Z12 connected in parallel, the voltage regulator diode Z12 is used to protect the driving transistor Q2 and the relay KA1.

[0008] Furthermore, in the resonance module, an H-bridge circuit is formed between the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4, wherein the first MOS tube VT1 and the fourth MOS tube VT4 form a group A, and the second MOS tube VT2 and the third MOS tube VT3 form a group B. By alternately turning on and off between the group A and the group B, direct current is converted into alternating current, and the current oscillates back and forth between the resonant inductor L and the resonant capacitor C to generate a high-frequency sinusoidal current, thereby driving a load such as a heating coil to generate heat.

[0009] Furthermore, the driving module includes: a first driving circuit QD1, a second driving circuit QD2, a third driving circuit QD3, a fourth driving circuit QD4 and a plurality of photoelectric couplers U1-U4; the driving circuit QD1 includes an input end connected to the photoelectric coupler U3, and is connected to the light emitting diode part of the photoelectric coupler U3 through a resistor R14, and the output end of the photoelectric coupler U3 is connected to the gate G of the first power MOS tube VT1; the photoelectric coupler U3 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the first power MOS tube VT1; the driving circuit QD2 includes an input end connected to the photoelectric coupler U1, and is connected to the light emitting diode part of the photoelectric coupler U1 through a resistor R8, and the output end of the photoelectric coupler U1 is connected to the gate G of the second power MOS tube VT2; the photoelectric coupler U1 is used to isolate the control signal from the power circuit, and The optical signal from the control signal is converted into an electrical signal for controlling the conduction of the second power MOS tube VT2; the driving circuit QD3 includes an input end connected to the photocoupler U2, and is connected to the light-emitting diode part of the photocoupler U2 through a resistor R11, and the output end of the photocoupler U2 is connected to the gate G of the third power MOS tube VT3; the photocoupler U2 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the third power MOS tube VT3; the driving circuit QD4 includes an input end connected to the photocoupler U4, and is connected to the light-emitting diode part of the photocoupler U4 through a resistor R17, and the output end of the photocoupler U4 is connected to the gate of the fourth power MOS tube VT4; the photocoupler U4 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the fourth power MOS tube VT4.

[0010] Furthermore, the signal control module has the following submodules: an all-pass protector IC1, a six-way buffer inverter IC2, a signal mixer IC3, an all-pass signal circuit IC4, a square wave signal generator IC5, a signal splitter IC6 and an operational amplifier IC9; the output end of the square wave signal generator IC5 is connected to the signal splitter IC6 and the signal mixer IC3, and the square wave signal generator IC5 is used to generate a square wave signal with a specific frequency and duty cycle, which is used to drive the MOS tube in the inverter to turn on and off according to a predetermined timing to form a high-frequency alternating current; the output end of the signal splitter IC6 The signal splitter IC6 is used to distribute the square wave signal generated by the square wave signal generator IC5 to multiple output ends, and transmit them to the six-way buffer inverter IC2 and the all-pass signal circuit IC4 respectively, to ensure that the power switch devices in the system can work synchronously or alternately; the input end of the signal mixer IC3 is connected to the square wave signal generator IC5 and the all-pass signal circuit IC4, and the output end is connected to the six-way buffer inverter IC2. The all-pass signal circuit IC4 is used to generate an all-pass signal under specific conditions to ensure that the power switch devices can be fully turned on to achieve the system. The output end of the all-pass protector IC1 is connected to the six-way buffer inverter IC2 to control the transmission of subsequent signals. The all-pass protector IC1 includes an operational amplifier, whose input end is connected to the signal from the signal mixer IC3 and the all-pass signal circuit IC4. When the system detects an abnormal state, the electronic switch circuit will cut off the transmission of the control signal to protect the power switch device, which is used to control the transmission and blocking of the signal in the system; the output end of the six-way buffer inverter IC2 is connected to the drive circuit for driving the gate. The six-way buffer inverter IC2 is used to invert and buffer the signal from the all-pass protector IC1 , to provide sufficient driving capability to control the MOS tube, and through inversion processing, ensure that the MOS tube can correctly switch the state under different conduction timings; the input end of the operational amplifier IC9 is connected to the current detection resistor, and the output end is connected to the protection control circuit of the system for monitoring and responding to abnormal current conditions. The operational amplifier IC9 is used to detect the current signal flowing through the load or power switch device, and amplify it for system monitoring. The detected current signal will be used in the overcurrent protection circuit. When the current exceeds the safe range, the signal control module will cut off the driving signal of the power switch device through the full-pass protector IC1 to protect the circuit safety.

[0011] Furthermore, the detection protection module includes: an overcurrent protection circuit, an undervoltage protection circuit, an overvoltage protection circuit and a water shortage protection circuit, wherein: the overcurrent protection circuit includes a current detection resistor PL6, a first operational amplifier IC9-1 and a voltage clamping diode Z13; the voltage signal of the current detection resistor PL6 is input to the positive input terminal of the first operational amplifier IC9-1, the voltage clamping diode Z13 is connected to the input terminal of the first operational amplifier IC9-1, and is used to prevent the input signal from exceeding the rated voltage of the operational amplifier, the negative input terminal of the first operational amplifier IC9-1 is connected to the reference voltage, and the output terminal of the first operational amplifier IC9-1 is connected to the first full-pass protector IC1-1, When the overcurrent protection circuit detects that the current exceeds a preset threshold, the first operational amplifier IC9-1 outputs a high-level signal to trigger the system to enter a protection state; the undervoltage protection circuit includes a first voltage-dividing resistor R29, a second voltage-dividing resistor R33, an undervoltage detection resistor PL5, a second operational amplifier IC9-2, a second full-pass protector IC1-2, a third full-pass protector IC1-3 and a voltage clamping diode Z16; the midpoint voltage between the first voltage-dividing resistor R29 and the second voltage-dividing resistor R33 is input to the positive input terminal of the second operational amplifier IC9-2 through the undervoltage detection resistor PL5, and the negative input terminal of the second operational amplifier IC9-2 is connected to a reference voltage, and the second The output end of the operational amplifier IC9-2 is connected to the input end of the second full-pass protector IC1-2, and the output end of the second full-pass protector IC1-2 is connected to the input end of the third full-pass protector IC1-3. The voltage clamping diode Z15 is connected to the input end of the second operational amplifier IC9-2 to prevent the input signal from exceeding the safety range. When the undervoltage protection circuit detects that the voltage is lower than the preset threshold, the second operational amplifier IC9-2 outputs a low-level signal to shut down the circuit and prevent the device from operating unstably; the overvoltage protection circuit includes a third voltage divider resistor R34, a fourth voltage divider resistor R38, an overvoltage detection resistor PL4, a third operational amplifier IC9-3, and a fourth full-pass protector IC 1-4 and voltage clamping diode Z14; the midpoint voltage of the third voltage-dividing resistor R34 and the fourth voltage-dividing resistor R38 is transmitted through the overvoltage detection resistor PL4 to the positive input terminal of the third operational amplifier IC9-3, the negative input terminal of the third operational amplifier IC9-3 is connected to the reference voltage, the output terminal of the third operational amplifier IC9-3 is connected to the input terminal of the fourth full-pass protector IC1-4, the voltage clamping diode Z14 is connected to the input terminal of the third operational amplifier IC9-3, and is used to protect the operational amplifier from overvoltage. When the overvoltage protection circuit detects that the voltage exceeds the set threshold, the third operational amplifier IC9-3 outputs a high-level signal to activate the protection mechanism to prevent overvoltage from damaging the device;The water shortage protection circuit includes a water level detection resistor R45, a fourth operational amplifier IC9-4, a fifth full-pass protector IC1-5 and a voltage clamping diode Z15. The output end of the fourth operational amplifier IC9-4 passes through the input end of the fifth full-pass protector IC1-5. The voltage clamping diode Z15 is used to protect the input end from damage by excessive voltage. The water level detection resistor R45 signal is input to the positive input end of the fourth operational amplifier IC9-4, and the negative input end of the fourth operational amplifier IC9-4 is connected to the reference voltage. ;

[0012] Furthermore, the feedback module includes an overvoltage lamp LED8, an undervoltage lamp LED7, an overcurrent lamp LED6, a water shortage lamp LED5, an eight-way NAND gate chip IC7, a latch IC8 and a buzzer. The latch IC8 is respectively connected to the overcurrent protection circuit, the undervoltage protection circuit, the overvoltage protection circuit and the water shortage protection circuit. The ninth pin of the latch IC8 is connected to the overvoltage lamp LED8 and the second pin of the eight-way NAND gate chip IC7. The taxi pin of the latch IC8 is respectively connected to the undervoltage lamp LED7 and the fifth pin of the eight-way NAND gate chip IC7. The thirteenth pin of the latch IC8 is respectively connected to the overcurrent lamp LED6 and the fourth pin of the eight-way NAND gate chip IC7. The first pin of the latch IC8 is respectively connected to the water shortage lamp LED5 and the third pin of the eight-way NAND gate chip IC7. The output end of the eight-way NAND gate chip IC7 is connected to the input end of the buzzer.

[0013] A high-safety self-checking electric hot water blanket water heating device comprises a high-safety self-checking electric hot water blanket water heating circuit as described in any one of claims 1-8.

[0014] Furthermore, it includes: a shell, a circuit board, an iron water box and an insulating heat-conducting sheet. The top and bottom of the shell are respectively provided with two cavities, which are respectively used to place the circuit board and install the iron water box. The hot water circuit of the high-safety self-test electric hot water blanket is arranged on the circuit board, and an insulating heat-conducting sheet is arranged between the iron water box and the circuit board. The insulating heat-conducting sheet is fitted with the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 on the circuit board.

[0015] The present invention provides a highly safe self-checking electric hot water blanket hot water circuit and device, which has the following beneficial effects:

[0016] The advantages of the present invention are:

[0017] 1. The present invention can monitor the operation status of the equipment in real time by integrating overcurrent protection, undervoltage protection, overvoltage protection and water shortage protection circuits. When an abnormal situation is detected, the system can respond quickly, cut off the circuit or sound an alarm to prevent potential safety hazards. This multiple protection mechanism greatly improves the safety of the equipment and is particularly suitable for long-term unattended application scenarios.

[0018] 2. The design of the resonance module can efficiently convert direct current into high-frequency sinusoidal alternating current through the H-bridge circuit composed of VT1 to VT4, combined with the resonant inductor L and the resonant capacitor C. This high-frequency alternating current can not only quickly heat the water body, but also improve the utilization efficiency of electrical energy, reduce energy loss, thereby shortening the heating time and saving energy.

[0019] 3. The power management module uses the design of a delayed start circuit. After the device is powered on, the delayed start circuit ensures that the device will not be damaged by the instantaneous high current impact or affect the normal operation of other devices. This design improves the startup stability of the device and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall process of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall circuit of the present invention.

[0022] Figure 3 It is a schematic diagram of the delay circuit of the present invention.

[0023] Figure 4 Schematic diagram of the detection circuit of the present invention.

[0024] Figure 5 It is a schematic diagram of the main heating circuit of the present invention.

[0025] Figure 6 Schematic diagram of the driving circuit of the present invention.

[0026] Figure 7 It is a schematic diagram of the detection circuit flow of the present invention.

[0027] Figure 8 It is a schematic diagram of the operational amplifier IC9 of the present invention.

[0028] Fig. 9 It is a schematic diagram of the full-pass protector IC1 of the present invention.

[0029] Fig.10 It is a schematic diagram of the overall device structure of the present invention.

[0030] Figure 1-10In: 1-power management module; 101-delay start circuit; 2-resonance module; 3-drive module; 4-detection protection module; 401-overcurrent protection circuit; 402-undervoltage protection circuit; 403-overvoltage protection circuit; 404-water shortage protection circuit; 5-feedback module; 6-signal control module; 7-housing; 701-circuit board; 702-iron water box; 703-insulating thermal conductive sheet. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0033] The embodiment of the present application provides a highly secure self-checking electric hot water blanket hot water circuit and device. The highly secure self-checking electric hot water blanket hot water circuit and device can realize the present invention by integrating overcurrent protection, undervoltage protection, overvoltage protection and water shortage protection circuits, and can monitor the operation status of the equipment in real time. When an abnormal situation is detected, the system can respond quickly, cut off the circuit or sound an alarm to prevent potential safety hazards. This multiple protection mechanism greatly improves the safety of the equipment, and is particularly suitable for long-term unattended application scenarios. The design of the resonant module can efficiently convert direct current into high-frequency sinusoidal alternating current through the H-bridge circuit composed of VT1 to VT4, combined with the resonant inductor L and the resonant capacitor C. This high-frequency alternating current can not only quickly heat the water body, but also improve the utilization efficiency of electric energy, reduce energy loss, thereby shortening the heating time and saving energy; the power management module uses the design of a delayed start circuit. After the device is powered on, the delayed start circuit ensures that the device will not be damaged by a momentary large current impact or affect the normal operation of other devices. This design improves the startup stability of the device and extends its service life. The following is a detailed description of the highly secure self-checking electric hot water blanket hot water circuit and device. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0034] The present application is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Figure 1-10 In the embodiment, a high-safety self-checking electric hot water blanket hot water circuit is provided, including: a power management module 1, the power management module 1 is used to connect an external DC power supply and provide power supply guarantee for the entire circuit; a resonance module 2, the resonance module 2 includes: a first MOS tube VT1, a second MOS tube VT2, a third MOS tube VT3, a fourth MOS tube VT4, a resonant inductor L and a resonant capacitor C. After the resonance module 2 is powered on, the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 alternately conduct the resonant inductor L and generate a high-frequency sinusoidal current, and the high-frequency sinusoidal current drives the load to quickly heat the water for the electric hot water blanket; a driving module 3, the driving module 3 is used to power and drive multiple MOS tubes in the resonance module 2 to open and close; a signal control module 6, the various components in the signal control module 6 are distributed throughout the circuit, and are used for signal conduction and control of the auxiliary circuit; a detection and protection module 4, the detection and protection module 4 is used to monitor the working condition of the entire circuit and cooperate with the power management module 1 to manage the circuit on and off; a feedback module 5, the feedback module 5 is used to cooperate with the detection and protection module 4 to record faults and make corresponding fault feedback.

[0035] Furthermore, the power management module 1 includes: a DC power supply, a fuse FU, a varistor V, a main circuit switch KA1, a fault circuit switch KA2, a sampling resistor RL and a Zener diode Z17. The DC power supply and the fuse FU, the sampling resistor RL, the main circuit switch KA1, and the fault circuit switch KA2 are connected in series to form a power supply circuit, and the sampling resistor RL and the Zener diode Z17 are connected in parallel in the above-mentioned power supply circuit.

[0036] Furthermore, the power management module 1 also includes a delayed start circuit 101, which includes: the delayed start circuit includes an operational amplifier U5, a delay capacitor E1, a driving transistor Q2, a relay KA1, a voltage regulator diode Z12 and a light-emitting diode LED9; the positive input terminal of the operational amplifier U5 is connected to the positive electrode of the delay capacitor E1, and the negative input terminal is connected to the ground; the positive electrode of the delay capacitor E1 is connected to the positive electrode of the power supply through the first resistor R7, and the positive electrode of the delay capacitor E1 is also connected to the negative input terminal of the operational amplifier U5 through the second resistor R27, the output terminal of the operational amplifier U5 is connected to the base of the driving transistor Q2, the collector of the driving transistor Q2 is connected to one end of the relay KA1, the emitter of the driving transistor Q2 is connected to the ground, and the other end of the relay KA1 is connected to the positive electrode of the power supply through the current limiting resistor R26, and through the light-emitting diode LED9 and the voltage regulator diode Z12 connected in parallel, the voltage regulator diode Z12 is used to protect the driving transistor Q2 and the relay KA1.

[0037] During use, the power management module 1 provides power through an external DC power supply, and the fuse FU is used to protect the circuit from overcurrent shock. The varistor V is used to prevent the influence of voltage fluctuations on the circuit, and the Zener diode Z17 is connected in parallel with the sampling resistor RL to stabilize and protect the circuit. The main circuit switch KA1 controls the opening and closing of the circuit, while the fault circuit switch KA2 disconnects the circuit when a fault is detected; this module ensures the safety of the circuit, and protects the circuit from voltage fluctuations and overcurrent through the cooperation of the fuse and the Zener diode. At the same time, the design of the delayed start circuit 101 prevents the circuit from being damaged by excessive current at the moment the power is turned on.

[0038] Furthermore, an H-bridge circuit is formed between the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 in the resonance module 2, wherein the first MOS tube VT1 and the fourth MOS tube VT4 form a group A, and the second MOS tube VT2 and the third MOS tube VT3 form a group B. By alternately turning on and off between the group A and the group B, direct current is converted into alternating current. The current oscillates back and forth between the resonant inductor L and the resonant capacitor C to generate a high-frequency sinusoidal current, thereby driving a load such as a heating coil to generate heat.

[0039] The first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 in the resonance module 2 are alternately turned on by the driving signal to form an H-bridge circuit structure. Through the action of the resonant inductor L and the resonant capacitor C, the current oscillates back and forth between the two, generating a high-frequency sinusoidal current, which ultimately drives the load such as the heating coil to generate heat for heating the water in the electric hot water blanket. The module realizes efficient energy conversion through the resonant circuit design, converting direct current into high-frequency alternating current, which can quickly heat the water body and improve the heating efficiency. The use of the H-bridge circuit structure makes the current conversion smoother and reduces the loss in the circuit.

[0040] Furthermore, the driving module 3 includes: a first driving circuit QD1, a second driving circuit QD2, a third driving circuit QD3, a fourth driving circuit QD4 and a plurality of photoelectric couplers U1-U4; the driving circuit QD1 includes an input end connected to the photoelectric coupler U3, and is connected to the light emitting diode part of the photoelectric coupler U3 through a resistor R14, and the output end of the photoelectric coupler U3 is connected to the gate G of the first power MOS tube VT1; the photoelectric coupler U3 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the first power MOS tube VT1; the driving circuit QD2 includes an input end connected to the photoelectric coupler U1, and is connected to the light emitting diode part of the photoelectric coupler U1 through a resistor R8, and the output end of the photoelectric coupler U1 is connected to the gate G of the second power MOS tube VT2; the photoelectric coupler U1 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the first power MOS tube VT1. The optical signal from the control signal is converted into an electrical signal for controlling the conduction of the second power MOS tube VT2; the driving circuit QD3 includes an input end connected to the photocoupler U2, and is connected to the light emitting diode part of the photocoupler U2 through the resistor R11, and the output end of the photocoupler U2 is connected to the gate G of the third power MOS tube VT3; the photocoupler U2 is used to isolate the control signal from the power circuit, and converts the optical signal from the control signal into an electrical signal for controlling the conduction of the third power MOS tube VT3; the driving circuit QD4 includes an input end connected to the photocoupler U4, and is connected to the light emitting diode part of the photocoupler U4 through the resistor R17, and the output end of the photocoupler U4 is connected to the gate of the fourth power MOS tube VT4; the photocoupler U4 is used to isolate the control signal from the power circuit, and converts the optical signal from the control signal into an electrical signal for controlling the conduction of the fourth power MOS tube VT4.

[0041] The driving module 3 isolates the control signal from the power circuit through the photocoupler U1-U4 to ensure the stable transmission of the control signal. The input end of each photocoupler is connected to the driving circuit QD1-QD4, and the output end is connected to the corresponding MOS tube gate to control the opening and closing of the MOS tube, thereby controlling the operation of the resonance module 2. The module avoids the control signal from being interfered by the power circuit through the isolation effect of the photocoupler, thereby improving the reliability and safety of the system. At the same time, the combination of the driving circuit and the MOS tube ensures the stable operation of the resonance module.

[0042] Furthermore, the signal control module 6 has the following submodules: an all-pass protector IC1, a six-way buffer inverter IC2, a signal mixer IC3, an all-pass signal circuit IC4, a square wave signal generator IC5, a signal splitter IC6 and an operational amplifier IC9; the output end of the square wave signal generator IC5 is connected to the signal splitter IC6 and the signal mixer IC3, and the square wave signal generator IC5 is used to generate a square wave signal with a specific frequency and duty cycle, which is used to drive the MOS tubes VT1-VT4 in the inverter to turn on and off according to a predetermined timing to form a high-frequency alternating current; the output ends of the signal splitter IC6 are respectively connected to the six-way buffer Inverter IC2 and all-pass signal circuit IC4, signal splitter IC6 is used to distribute the square wave signal generated by square wave signal generator IC5 to multiple output ends, and transmit them to six-way buffer inverter IC2 and all-pass signal circuit IC4 respectively, to ensure that the power switching devices in the system can work synchronously or alternately; the input end of signal mixer IC3 is connected to square wave signal generator IC5 and all-pass signal circuit IC4, and the output end is connected to six-way buffer inverter IC2. All-pass signal circuit IC4 is used to generate an all-pass signal under specific conditions, such as when the system requires maximum output or specific operation, to ensure that the power switching devices can be fully turned on to achieve the power output required by the system; all-pass The output end of the protector IC1 is connected to the six-way buffer inverter IC2 to control the transmission of subsequent signals. The all-pass protector IC1 includes an operational amplifier, whose input end is connected to the signal from the signal mixer IC3 and the all-pass signal circuit IC4. When the system detects an abnormal state such as overcurrent, overvoltage or undervoltage, the electronic switch circuit will cut off the transmission of the control signal to protect the power switching devices VT1-VT4, which is used to control the transmission and blocking of signals in the system; the output end of the six-way buffer inverter IC2 is connected to the drive circuit QD1-QD4 to drive the gate of VT1-VT4. The six-way buffer inverter IC2 is used to invert and buffer the signals from the all-pass protector IC 1 signal to provide sufficient driving capability to control the MOS tubes VT1-VT4. Through inversion processing, it is ensured that the MOS tubes can switch states correctly under different conduction timings; the input end of the operational amplifier IC9 is connected to the current detection resistor, and the output end is connected to the protection control circuit of the system for monitoring and responding to abnormal current conditions. The operational amplifier IC9 is used to detect the current signal flowing through the load or power switching device and amplify it for system monitoring. The detected current signal will be used in the overcurrent protection circuit. When the current exceeds the safe range, the signal control module 6 will cut off the driving signal of the power switching device through the full-pass protector IC1 to protect the circuit safety.

[0043] During use, the signal control module 6 generates and distributes control signals, the square wave signal generator IC5 generates square wave signals of specific frequency and duty cycle, the signal splitter IC6 distributes these signals to each buffer inverter IC2, and provides an all-pass signal under specific conditions through the all-pass signal circuit IC4. The signal mixer IC3 is responsible for combining the square wave signal with the all-pass signal to drive the MOS tube to turn on and off. This module ensures the accurate transmission and distribution of the control signal, so that the MOS tube can be turned on and off correctly according to the timing, thereby stabilizing the operation of the resonant module. The setting of the all-pass signal improves the response speed and efficiency of the circuit.

[0044] Furthermore, the detection protection module 4 includes: an overcurrent protection circuit 401, an undervoltage protection circuit 402, an overvoltage protection circuit 403 and a water shortage protection circuit 404, wherein:

[0045] The overcurrent protection circuit includes a current detection resistor PL6, a 1 / 4 part of the first operational amplifier IC9-1IC9 and a voltage clamping diode Z13; the voltage signal of the current detection resistor PL6 is input to the positive input terminal of the first operational amplifier IC9-1, the voltage clamping diode Z13 is connected to the input terminal of the first operational amplifier IC9-1, and is used to prevent the input signal from exceeding the rated voltage of the operational amplifier, the negative input terminal of the first operational amplifier IC9-1 is connected to the reference voltage, and the output terminal of the first operational amplifier IC9-1 is connected to the 1 / 6 part of the first full-pass protector IC1-1IC1. When the overcurrent protection circuit detects that the current exceeds the preset threshold, the first operational amplifier IC9-1 outputs a high-level signal to trigger the system to enter a protection state;

[0046] The undervoltage protection circuit includes a first voltage dividing resistor R29, a second voltage dividing resistor R33, an undervoltage detection resistor PL5, a 1 / 4 portion of the second operational amplifier IC9-2IC9, a 1 / 6 portion of the second full-pass protector IC1-2IC1, a 1 / 6 portion of the third full-pass protector IC1-3IC1 and a voltage clamping diode Z16; the midpoint voltage between the first voltage dividing resistor R29 and the second voltage dividing resistor R33 is input to the positive input terminal of the second operational amplifier IC9-2 through the undervoltage detection resistor PL5, and the second operational amplifier IC The negative input terminal of IC9-2 is connected to the reference voltage, the output terminal of the second operational amplifier IC9-2 is connected to the input terminal of the second full-pass protector IC1-2, the output terminal of the second full-pass protector IC1-2 is connected to the input terminal of the third full-pass protector IC1-3, the voltage clamping diode Z15 is connected to the input terminal of the second operational amplifier IC9-2 to prevent the input signal from exceeding the safety range, and when the undervoltage protection circuit detects that the voltage is lower than the preset threshold, the second operational amplifier IC9-2 outputs a low-level signal to shut down the circuit and prevent the device from unstable operation;

[0047] The overvoltage protection circuit includes a third voltage-dividing resistor R34, a fourth voltage-dividing resistor R38, an overvoltage detection resistor PL4, a 1 / 4 part of the third operational amplifier IC9-3IC9, a 1 / 6 part of the fourth full-pass protector IC1-4IC1 and a voltage clamping diode Z14; the midpoint voltage of the third voltage-dividing resistor R34 and the fourth voltage-dividing resistor R38 is transmitted through the overvoltage detection resistor PL4 to the positive input terminal of the third operational amplifier IC9-3, the negative input terminal of the third operational amplifier IC9-3 is connected to the reference voltage, the output terminal of the third operational amplifier IC9-3 is connected to the input terminal of the fourth full-pass protector IC1-4, and the voltage clamping diode Z14 is connected to the input terminal of the third operational amplifier IC9-3 to protect the operational amplifier from overvoltage. When the overvoltage protection circuit detects that the voltage exceeds the set threshold, the third operational amplifier IC9-3 outputs a high-level signal to activate the protection mechanism to prevent overvoltage from damaging the device;

[0048] The water shortage protection circuit 404 includes a water level detection resistor R45, a 1 / 4 part of the fourth operational amplifier IC9-4IC9, a 1 / 6 part of the fifth full-pass protector IC1-5IC1 and a voltage clamping diode Z15. The output end of the fourth operational amplifier IC9-4 passes through the input end of the fifth full-pass protector IC1-5. The voltage clamping diode Z15 is used to protect the input end from damage by excessive voltage. The water level detection resistor R45 signal is input to the positive input end of the fourth operational amplifier IC9-4, and the negative input end of the fourth operational amplifier IC9-4 is connected to the reference voltage.

[0049] During use, the detection protection module 4 includes overcurrent protection, undervoltage protection, overvoltage protection and water shortage protection circuits. Each protection circuit detects the corresponding current, voltage or water level signal, and amplifies and compares the signal through the operational amplifier IC9. Once an abnormality is detected, the protection circuit triggers the protection mechanism through the full-pass protector IC1, cuts off the circuit or sounds an alarm. This module provides multi-level security protection for the system, can detect the circuit operation status in real time, and take protective measures in time when an abnormality occurs, effectively preventing circuit damage or causing safety accidents.

[0050] Furthermore, the feedback module 5 includes an overvoltage lamp LED8, an undervoltage lamp LED7, an overcurrent lamp LED6, a water shortage lamp LED5, an eight-way NAND gate chip IC7, a latch IC8 and a buzzer. The latch IC8 is respectively connected to the overcurrent protection circuit 401, the undervoltage protection circuit 402, the overvoltage protection circuit 403 and the water shortage protection circuit 404, the ninth pin of the latch IC8 is connected to the overvoltage lamp LED8 and the second pin of the eight-way NAND gate chip IC7, the taxi pin of the latch IC8 is respectively connected to the undervoltage lamp LED7 and the fifth pin of the eight-way NAND gate chip IC7, the thirteenth pin of the latch IC8 is respectively connected to the overcurrent lamp LED6 and the fourth pin of the eight-way NAND gate chip IC7, the first pin of the latch IC8 is respectively connected to the water shortage lamp LED5 and the third pin of the eight-way NAND gate chip IC7, and the output end of the eight-way NAND gate chip IC7 is connected to the input end of the buzzer.

[0051] During use, the feedback module 5 records and stores the fault status through the latch IC8, the LED indicator lights LED5-LED8 are used to display the current fault status, and the eight-way NAND gate chip IC7 triggers the buzzer alarm when a fault is detected to warn the user. This module ensures timely feedback of fault information, and the user can quickly understand the operating status of the circuit and intuitively understand the fault location through the LED indicator lights, which helps to quickly deal with problems and improves the convenience and safety of system operation.

[0052] The utility model discloses a high-safety self-checking electric hot water blanket hot water device, which comprises a high-safety self-checking electric hot water blanket hot water circuit.

[0053] Furthermore, it includes: a shell 7, a circuit board 701, an iron water box 702 and an insulating heat-conducting sheet 703. Two cavities are respectively opened at the top and the bottom of the shell 7, which are respectively used to place the circuit board 701 and install the iron water box 702. The hot water circuit of the high-safety self-test electric hot water blanket is arranged on the circuit board 701, and an insulating heat-conducting sheet 703 is arranged between the iron water box 702 and the circuit board 701. The insulating heat-conducting sheet 703 is in contact with the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 on the circuit board 701.

[0054] During use, the housing 7 protects the circuit board 701, the iron water box 702 and the insulating heat conductive sheet 703 inside the device. A self-testing electric hot water blanket hot water circuit is installed on the circuit board. The iron water box is used to contain water. The insulating heat conductive sheet ensures insulation and heat conduction between the circuit board and the heating component. The first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 controlled by the circuit board 701 cooperate with the iron water box 702 to heat the water in the iron water box 702. At the same time, the MOS tube will generate a lot of heat during operation. The insulating heat conductive sheet 703 can guide the heat into the iron water box 702 below to assist in heating the water. In this process, the heat of the MOS tube can be absorbed, so that the thermal application efficiency of the device is higher and the MOS tube can be cooled to prevent it from being overheated and damaged.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The above is a detailed introduction to a high-safety self-checking electric hot water blanket hot water circuit and device provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A high-safety self-checking electric hot water blanket hot water circuit, characterized in that: include: A power management module (1), the power management module (1) being used to connect to an external DC power source and provide power supply guarantee for the entire circuit; A resonance module (2), the resonance module (2) comprising: a first MOS tube VT1, a second MOS tube VT2, a third MOS tube VT3, a fourth MOS tube VT4, a resonance inductor L and a resonance capacitor C. After the resonance module (2) is powered on, the first MOS tube VT1, the second MOS tube VT2, the third MOS tube VT3 and the fourth MOS tube VT4 alternately conduct the resonance inductor L and generate a high-frequency sinusoidal current, and the high-frequency sinusoidal current drives the load to quickly heat the water for the electric hot water blanket; A driving module (3), the driving module (3) being used to supply power to drive the multiple MOS tubes in the resonance module (2) to open and close; A signal control module (6), wherein the components of the signal control module (6) are distributed throughout the circuit and are used to assist in signal conduction and control of the circuit; A detection and protection module (4), the detection and protection module (4) is used to monitor the overall working condition of the circuit and cooperate with the power management module (1) to manage the conduction and disconnection of the circuit; A feedback module (5), the feedback module (5) is used to cooperate with the detection and protection module (4) to record faults and make corresponding fault feedback.

2. The high-safety self-checking electric hot water blanket hot water circuit according to claim 1 is characterized in that: The power management module (1) comprises: a DC power supply, a fuse FU, a varistor V, a main circuit switch KA1, a fault circuit switch KA2, a sampling resistor RL and a Zener diode Z17; the DC power supply and the fuse FU, the sampling resistor RL, the main circuit switch KA1 and the fault circuit switch KA2 are connected in series to form a power supply circuit; the sampling resistor RL and the Zener diode Z17 are connected in parallel to the power supply circuit.

3. The high-safety self-checking electric hot water blanket hot water circuit according to claim 2 is characterized in that: The power management module (1) further comprises a time-delay start circuit (101), the time-delay start circuit (101) comprising: the time-delay start circuit comprises an operational amplifier U5, a time-delay capacitor E1, a driving transistor Q2, a relay KA1, a voltage-stabilizing diode Z12 and a light-emitting diode LED9; the positive input terminal of the operational amplifier U5 is connected to the positive electrode of the time-delay capacitor E1, and the negative input terminal is connected to the ground; the positive electrode of the time-delay capacitor E1 is connected to the positive electrode of the power supply through a first resistor R7, the positive electrode of the time-delay capacitor E1 is also connected to the negative input terminal of the operational amplifier U5 through a second resistor R27, the output terminal of the operational amplifier U5 is connected to the base of the driving transistor Q2, the collector of the driving transistor Q2 is connected to one end of the relay KA1, the emitter of the driving transistor Q2 is connected to the ground, the other end of the relay KA1 is connected to the positive electrode of the power supply through a current-limiting resistor R26, and through the light-emitting diode LED9 and the voltage-stabilizing diode Z12 connected in parallel, the voltage-stabilizing diode Z12 is used to protect the driving transistor Q2 and the relay KA1.

4. The high-safety self-checking electric hot water blanket hot water circuit according to claim 1 is characterized in that: In the resonance module (2), the first MOS transistor VT1, the second MOS transistor VT2, the third MOS transistor VT3 and the fourth MOS transistor VT4 form an H-bridge circuit, wherein the first MOS transistor VT1 and the fourth MOS transistor VT4 form a group A, and the second MOS transistor VT2 and the third MOS transistor VT3 form a group B. By alternately turning on and off the group A and the group B, direct current is converted into alternating current, and the current oscillates back and forth between the resonant inductor L and the resonant capacitor C to generate a high-frequency sinusoidal current, thereby driving a load such as a heating coil to generate heat.

5. The high-safety self-checking electric hot water blanket hot water circuit according to claim 1 is characterized in that: The driving module (3) comprises: a first driving circuit QD1, a second driving circuit QD2, a third driving circuit QD3, a fourth driving circuit QD4 and a plurality of photoelectric couplers U1-U4; The driving circuit QD1 includes an input end connected to the photocoupler U3, and is connected to the light-emitting diode part of the photocoupler U3 through a resistor R14, and the output end of the photocoupler U3 is connected to the gate G of the first power MOS tube VT1; the photocoupler U3 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the first power MOS tube VT1 to turn on; The driving circuit QD2 includes an input end connected to the photocoupler U1, and is connected to the light-emitting diode part of the photocoupler U1 through a resistor R8, and the output end of the photocoupler U1 is connected to the gate G of the second power MOS tube VT2; the photocoupler U1 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the second power MOS tube VT2; The driving circuit QD3 includes an input end connected to the photocoupler U2, and is connected to the light-emitting diode part of the photocoupler U2 through a resistor R11, and the output end of the photocoupler U2 is connected to the gate G of the third power MOS tube VT3; the photocoupler U2 is used to isolate the control signal from the power circuit, and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the third power MOS tube VT3; The driving circuit QD4 includes an input end connected to the photocoupler U4 and a light-emitting diode part connected to the photocoupler U4 through a resistor R17, and an output end of the photocoupler U4 is connected to the gate of the fourth power MOS tube VT4; the photocoupler U4 is used to isolate the control signal from the power circuit and convert the optical signal from the control signal into an electrical signal for controlling the conduction of the fourth power MOS tube VT4.

6. The high-safety self-checking electric hot water blanket hot water circuit according to claim 1 is characterized in that: The signal control module (6) comprises the following submodules: an all-pass protector IC1, a six-way buffer inverter IC2, a signal mixer IC3, an all-pass signal circuit IC4, a square wave signal generator IC5, a signal splitter IC6 and an operational amplifier IC9; The output end of the square wave signal generator IC5 is connected to the signal splitter IC6 and the signal mixer IC3. The square wave signal generator IC5 is used to generate square wave signals with specific frequency and duty cycle. These signals are used to drive the MOS tubes (VT1-VT4) in the inverter to turn on and off according to a predetermined timing to form high-frequency alternating current. The output end of the signal splitter IC6 is connected to the six-way buffer inverter IC2 and the all-pass signal circuit IC4 respectively. The signal splitter IC6 is used to distribute the square wave signal generated by the square wave signal generator IC5 to multiple output ends, and transmit them to the six-way buffer inverter IC2 and the all-pass signal circuit IC4 respectively, to ensure that the power switching devices in the system can work synchronously or alternately; The input end of the signal mixer IC3 is connected to the square wave signal generator IC5 and the all-pass signal circuit IC4, and the output end is connected to the six-way buffer inverter IC2. The all-pass signal circuit IC4 is used to generate an all-pass signal under specific conditions (such as when the system requires maximum output or specific operation) to ensure that the power switch device can be fully turned on to achieve the power output required by the system; The output end of the all-pass protector IC1 is connected to the six-way buffer inverter IC2 to control the transmission of subsequent signals. The all-pass protector IC1 includes an operational amplifier, whose input end is connected to the signal from the signal mixer IC3 and the all-pass signal circuit IC4. When the system detects an abnormal state (such as overcurrent, overvoltage or undervoltage), the electronic switch circuit will cut off the transmission of the control signal to protect the power switch device (VT1-VT4), which is used to control the transmission and blocking of signals in the system; The output end of the six-way buffer inverter IC2 is connected to the driving circuit (QD1-QD4) for driving the gate of (VT1-VT4). The six-way buffer inverter IC2 is used to invert and buffer the signal from the full-pass protector IC1 to provide sufficient driving capability to control the MOS tube (VT1-VT4). Through the inversion process, it is ensured that the MOS tube can correctly switch the state under different conduction timings; The input end of the operational amplifier IC9 is connected to the current detection resistor, and the output end is connected to the protection control circuit of the system, which is used to monitor and respond to abnormal current conditions. The operational amplifier IC9 is used to detect the current signal flowing through the load or the power switch device, and amplify it for system monitoring. The detected current signal will be used in the overcurrent protection circuit. When the current exceeds the safe range, the signal control module (6) will cut off the drive signal of the power switch device through the full-pass protector IC1 to protect the circuit safety.

7. The high-safety self-checking electric hot water blanket hot water circuit according to claim 1 is characterized in that: The detection protection module (4) comprises: an overcurrent protection circuit (401), an undervoltage protection circuit (402), an overvoltage protection circuit (403) and a water shortage protection circuit (404), wherein: The overcurrent protection circuit includes a current detection resistor PL6, a first operational amplifier IC9-1 (1 / 4 part of IC9) and a voltage clamping diode Z13; the voltage signal of the current detection resistor PL6 is input to the positive input terminal of the first operational amplifier IC9-1, the voltage clamping diode Z13 is connected to the input terminal of the first operational amplifier IC9-1, and is used to prevent the input signal from exceeding the rated voltage of the operational amplifier, the negative input terminal of the first operational amplifier IC9-1 is connected to the reference voltage, the output terminal of the first operational amplifier IC9-1 is connected to the first full-pass protector IC1-1 (1 / 6 part of IC1), and when the overcurrent protection circuit detects that the current exceeds a preset threshold, the first operational amplifier IC9-1 outputs a high-level signal to trigger the system to enter a protection state; The undervoltage protection circuit includes a first voltage-dividing resistor R29, a second voltage-dividing resistor R33, an undervoltage detection resistor PL5, a second operational amplifier IC9-2 (1 / 4 part of IC9), a second full-pass protector IC1-2 (1 / 6 part of IC1), a third full-pass protector IC1-3 (1 / 6 part of IC1) and a voltage clamping diode Z16; the midpoint voltage between the first voltage-dividing resistor R29 and the second voltage-dividing resistor R33 is input to the positive input terminal of the second operational amplifier IC9-2 through the undervoltage detection resistor PL5, and the second operational amplifier The negative input terminal of IC9-2 is connected to the reference voltage, the output terminal of the second operational amplifier IC9-2 is connected to the input terminal of the second full-pass protector IC1-2, the output terminal of the second full-pass protector IC1-2 is connected to the input terminal of the third full-pass protector IC1-3, the voltage clamping diode Z15 is connected to the input terminal of the second operational amplifier IC9-2, and is used to prevent the input signal from exceeding the safety range. When the undervoltage protection circuit detects that the voltage is lower than the preset threshold, the second operational amplifier IC9-2 outputs a low-level signal to shut down the circuit and prevent the device from unstable operation; The overvoltage protection circuit includes a third voltage-dividing resistor R34, a fourth voltage-dividing resistor R38, an overvoltage detection resistor PL4, a third operational amplifier IC9-3 (1 / 4 part of IC9), a fourth full-pass protector IC1-4 (1 / 6 part of IC1) and a voltage clamping diode Z14; the midpoint voltage of the third voltage-dividing resistor R34 and the fourth voltage-dividing resistor R38 is transmitted through the overvoltage detection resistor PL4 to the positive input terminal of the third operational amplifier IC9-3, the negative input terminal of the third operational amplifier IC9-3 is connected to the reference voltage, the output terminal of the third operational amplifier IC9-3 is connected to the input terminal of the fourth full-pass protector IC1-4, the voltage clamping diode Z14 is connected to the input terminal of the third operational amplifier IC9-3, and is used to protect the operational amplifier from overvoltage. When the overvoltage protection circuit detects that the voltage exceeds the set threshold, the third operational amplifier IC9-3 outputs a high-level signal to activate the protection mechanism to prevent overvoltage from damaging the device; The water shortage protection circuit (404) includes a water level detection resistor R45, a fourth operational amplifier IC9-4 (1 / 4 part of IC9), a fifth full-pass protector IC1-5 (1 / 6 part of IC1) and a voltage clamping diode Z15. The output end of the fourth operational amplifier IC9-4 passes through the input end of the fifth full-pass protector IC1-5. The voltage clamping diode Z15 is used to protect the input end from damage by excessive voltage. The water level detection resistor R45 signal is input to the positive input end of the fourth operational amplifier IC9-4, and the negative input end of the fourth operational amplifier IC9-4 is connected to a reference voltage.

8. The high-safety self-checking electric hot water blanket hot water circuit according to claim 7 is characterized in that: The feedback module (5) comprises an overvoltage lamp LED8, an undervoltage lamp LED7, an overcurrent lamp LED6, a water shortage lamp LED5, an eight-way NAND gate chip IC7, a latch IC8 and a buzzer. C8 is respectively connected to the overcurrent protection circuit (401), the undervoltage protection circuit (402), the overvoltage protection circuit (403) and the water shortage protection circuit (404); the ninth pin of the latch IC8 is connected to the overvoltage lamp LED8 and the second pin of the eight-way NAND gate chip IC7; the third pin of the latch IC8 is respectively connected to the undervoltage lamp LED7 and the fifth pin of the eight-way NAND gate chip IC7; the thirteenth pin of the latch IC8 is respectively connected to the overcurrent lamp LED6 and the fourth pin of the eight-way NAND gate chip IC7; the first pin of the latch IC8 is respectively connected to the water shortage lamp LED5 and the third pin of the eight-way NAND gate chip IC7; the output end of the eight-way NAND gate chip IC7 is connected to the input end of the buzzer.

9. A highly safe self-checking electric hot water blanket water heater, characterized in that: The invention comprises a high-safety self-checking electric hot water blanket hot water circuit as described in any one of claims 1-8.

10. The high-safety self-checking electric hot water blanket water heater according to claim 9, characterized in that: include: A shell (7), a circuit board (701), an iron water box (702) and an insulating heat conductive sheet (703); the top and bottom of the shell (7) are respectively provided with two cavities, which are respectively used to place the circuit board (701) and install the iron water box (702); the hot water circuit of the high-safety self-checking electric hot water blanket is arranged on the circuit board (701); an insulating heat conductive sheet (703) is arranged between the iron water box (702) and the circuit board (701); the insulating heat conductive sheet (703) is in contact with a first MOS tube VT1, a second MOS tube VT2, a third MOS tube VT3 and a fourth MOS tube VT4 on the circuit board (701).

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