CN111741546A - Safe mite-killing electric blanket control circuit meeting electromagnetic compatibility requirement - Google Patents

Safe mite-killing electric blanket control circuit meeting electromagnetic compatibility requirement Download PDF

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Publication number
CN111741546A
CN111741546A CN202010669485.9A CN202010669485A CN111741546A CN 111741546 A CN111741546 A CN 111741546A CN 202010669485 A CN202010669485 A CN 202010669485A CN 111741546 A CN111741546 A CN 111741546A
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China
Prior art keywords
resistor
diode
capacitor
circuit
control circuit
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CN202010669485.9A
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CN111741546B (en
Inventor
田鹏
万昌斌
何洁
张博文
杨汉宗
谭雷
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Chengdu Rainbow Appliance Group Shares Co ltd
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Chengdu Rainbow Appliance Group Shares Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0272—For heating of fabrics
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G9/00—Bed-covers; Counterpanes; Travelling rugs; Sleeping rugs; Sleeping bags; Pillows
    • A47G9/02—Bed linen; Blankets; Counterpanes
    • A47G9/0207—Blankets; Duvets
    • A47G9/0215—Blankets; Duvets with cooling or heating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H05B3/342—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs heaters used in textiles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G9/00—Bed-covers; Counterpanes; Travelling rugs; Sleeping rugs; Sleeping bags; Pillows
    • A47G2009/001—Anti-allergen; Anti-mite

Abstract

The application relates to the field of electric blanket production, in particular to a safe mite-killing electric blanket control circuit meeting the electromagnetic compatibility requirement, wherein a power supply circuit is connected with a single-chip microcomputer control circuit and a trigger circuit; the singlechip control circuit is connected with the trigger circuit and the power control circuit; the display circuit is connected with the switch in parallel; the power supply circuit is connected with the heating element through a main controllable silicon V1 and a slave controllable silicon V2 in the power control circuit, and the protection circuit is connected with the power supply circuit. According to the pulse interference suppression circuit, a voltage dependent resistor and a capacitor are connected in parallel to absorb pulse interference, and meanwhile, a self-recovery fuse is connected in series in a power circuit to block large current formed by pulse interference lower than the limit value of the voltage dependent resistor; the negative half-wave gate circuit of the singlechip trigger signal is formed by the triode, so that zero-crossing triggering is realized, and the interference on the power grid environment is avoided; the mite removal is realized by a combination mode of human body contact safety temperature and dehumidification drying, and low-temperature scalding or heat radiation injury to a user possibly caused by high-temperature mite removal is avoided.

Description

Safe mite-killing electric blanket control circuit meeting electromagnetic compatibility requirement
Technical Field
The application relates to the field of electric blanket production, in particular to a safe mite-killing electric blanket control circuit meeting electromagnetic compatibility (EMC) requirements.
Background
When the existing common electric blanket or the mite removing electric blanket is in a working state, the control circuit of the electric blanket or the mite removing electric blanket can be abnormal in work or even damaged when being subjected to electromagnetic interference; and the common electric blanket or the mite-killing electric blanket even has the disturbance which is not allowed to be generated according to national standard in the working state. Particularly, in the technical scheme of absorbing the power grid pulse interference by combining a piezoresistor and a capacitor in the prior art, the circuit cannot block continuous pulse interference of voltage smaller than the limiting value of the piezoresistor, cannot fully protect low-voltage electronic components commonly adopted in the circuit, and has obvious technical defects. And the existing mite-killing electric blanket adopts high-temperature mite killing: in some electric blankets, the temperature of the surface of the electric blanket is even raised to 60 ℃ or above, and the heating time and the heating temperature are fixed. If the user misuses the mite removing function during sleeping, low-temperature scald and even heat radiation injury can be caused.
At present, household appliances must perform and meet national standards: GB 4343.1, GB 4343.2. Electromagnetic compatibility (EMC) in a standard refers to the ability of a device or system to perform satisfactorily in its electromagnetic environment and not to generate intolerable electromagnetic interference to any device in its environment. Therefore, EMC includes two requirements: on one hand, the electromagnetic interference generated to the environment by the equipment or the system in the normal operation process cannot exceed a certain limit value; another aspect refers to a device or system that has some degree of immunity to electromagnetic interference present in the environment in which it is located.
The prior patent is as the utility model patent with application number CN201820283917.0, name "an intelligent safety electric blanket", and its technical scheme is: the utility model relates to an intelligent safety electric blanket, which comprises a blanket body, wherein a snakelike nickel alloy low-voltage heating wire is arranged in the blanket body, and the nickel alloy low-voltage heating wire is arranged in at least three heating areas formed in the blanket body and is provided with high-precision temperature sensors, and each high-precision temperature sensor is connected with a control device outside the blanket body; and the isolation transformer direct current power supply is connected with the control device and outputs low-voltage direct current lower than 24V. Although the above patent claims to solve the electromagnetic interference, the purpose is to solve the problem that the alternating magnetic field generated by the alternating current of the electric blanket body is harmful to human health after long-term use, but not the continuous disturbance generated by the equipment or system and the electromagnetic interference immunity of the equipment or system defined by the national standard.
Disclosure of Invention
Aiming at the problems of electromagnetic compatibility and the possibility of harm to human bodies due to overhigh mite removing temperature in the prior art, the application provides the mite removing electric blanket control circuit which meets the national standard requirement of electromagnetic compatibility (EMC) and can safely contact with human bodies.
In order to achieve the technical effects, the technical scheme of the application is as follows:
a safe mite-killing electric blanket control circuit meeting the electromagnetic compatibility requirement comprises a power circuit, a singlechip control circuit, a trigger circuit, a power control circuit, a multi-gear sliding combination switch with a double-pole single-throw structure, a protection circuit and a display circuit; wherein the power supply circuit is connected with the singlechip control circuit and the trigger circuit; the singlechip control circuit is connected with the trigger circuit and the power control circuit; the multi-gear sliding combination switch comprises K1 and K1-1, and the switch K1-1 is connected with the singlechip control circuit; the switch K1 is connected with the power supply circuit, the power control circuit and the trigger circuit; the display circuit is connected with the power supply circuit; the power supply circuit is connected with the heating element through a main controllable silicon V1 and a slave controllable silicon V2 in the power control circuit, and the protection circuit is connected with the power supply circuit. The invention has the characteristics of strong continuous voltage interference resistance, no interference to other electrical appliances during working and automatic power-off during abnormal working; and the singlechip is preset with gear function control programs such as mite removal, temperature rise, heat preservation, sleep and the like, different functions comprise different temperature rise rates, temperature rise limit values and heat preservation time, and particularly, the mite removal function is a logic combination program of temperature, dehumidification and time: the temperature for removing the mites is 42-45 ℃ (the temperature is not more than 45 ℃ of the safe contact temperature of human bodies), and meanwhile, the mites are removed by dehumidifying and drying until the humidity is less than 50 percent.
The singlechip in the singlechip control circuit is preset with control programs of four gears of mite removal, preheating, heat preservation and sleeping, wherein:
and (3) removing mites: the average heating rate is 0.8-1 deg.C/min, the temperature is raised to 42-45 deg.C, and the maximum temperature is 45 deg.C. Measuring the humidity while heating, continuously dehumidifying at constant temperature and starting timing when the humidity is reduced to 40% -50%, and starting cooling after 60-120 minutes: the temperature reduction rate is 1 ℃ every 15 minutes until the temperature is reduced to 36-37 ℃, the constant temperature is maintained to be dry, and the set range of the work timing of mite removal is 6-10 hours;
preheating and temperature rising procedures: heating and preheating for 1.5-3.5 hours, heating to 42-45 ℃ and keeping the temperature, wherein the maximum temperature limit value is 45 ℃, the heating timing is finished after 1.5-3.5 hours, the time ratio is controlled to control the maximum average power, and the power-on time and the power-off time ratio is 30 s: 10s (P =3: 1), controlling the temperature to be 39-40 ℃ at the highest limit and 35-37 ℃ at the lowest limit; the working timing setting range is 1-12 hours or is not timed for a long time;
and (3) heat preservation procedure: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 30 s: 30s (P =1: 1), and controlling the highest temperature of 36-37 ℃; the working timing setting range is 1-12 hours or is not timed for a long time;
a sleep program: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 10 s: 30s (P =1: 3), and controlling the temperature to be the highest limit temperature of 20-22 ℃; the working timing is set within the range of 1-12 hours or is indefinite for a long time.
All the heating and conducting instructions are sent out when the single chip microcomputer detects that the phase of the alternating current passes through zero, the humidity of the electric blanket is detected by the resistance-type humidity sensor R25 and fed back to the single chip microcomputer, and the temperature of the electric blanket is detected by the first temperature sensor RT and fed back to the single chip microcomputer.
Furthermore, the mains supply is connected to the power supply circuit through a switch K1, and the power supply circuit comprises a first current fuse FU, a first voltage dependent resistor RV, a first capacitor C1, a first self-recovery fuse RZ, a first resistor R1, a second resistor R2, a second capacitor C2, a first diode D1, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first voltage regulator ZD1 and a first three-terminal regulator IC 1; input electrodes 2 and 4 of a switch K1 are respectively connected with two electrodes L, N of a mains supply, a K1 output electrode 1 corresponding to the input electrode 2 of K1 is connected with one end of a first current fuse FU, and a K1 output electrode 3 corresponding to the input electrode 4 of K1 is connected with one end of a first hot melt FT1 in the protection circuit; one end of a first capacitor C1 is connected with the other end of the first current fuse FU after being connected with the first piezoresistor RV in parallel, and the other end of the first capacitor C1 is connected with the other end of the first hot melt FT1 after being connected with the first piezoresistor RV in parallel; one end of the first self-recovery fuse RZ is connected with the connecting ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the other end of the first self-recovery fuse RZ is connected with one end of a first resistor R1; one end of a second capacitor C2 is connected with the other end of the first resistor R1 after being connected with the second resistor R2 in parallel; the second capacitor C2 is connected with the second resistor R2 in parallel, and the other end of the second capacitor C2 is connected with the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is connected with the connection ends of the first capacitor C1, the first piezoresistor RV and the first hot melt FT 1; after being connected in parallel, a first voltage-regulator tube ZD1, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the negative electrode of the first voltage-regulator tube ZD1 is connected with the negative electrode of a first diode D1, and after being connected in parallel, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the positive electrode of the first voltage-regulator tube ZD1 is connected with the positive electrode of a second diode D2; the input end of the first three-terminal regulator IC1 is connected with the cathode of the first diode D1, and the grounding end of the first three-terminal regulator IC1 is connected with the anode of the second diode D2; one end of the fifth capacitor C5 is connected to the output terminal of the first three-terminal regulator IC1, and the other end of the fifth capacitor C5 is connected to the ground terminal of the first three-terminal regulator IC 1.
Further, the single chip microcomputer control circuit comprises a single chip microcomputer IC2 capable of presetting control program software, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a twenty-sixth resistor R26, a resistance-type humidity sensor R25 and a first temperature sensor RT; a first wiring end of the switch K1-1 is connected with one end of the resistance-type humidity sensor R25 and then connected with a third pin of the single chip microcomputer; the second terminal is connected with one end of a sixth resistor R6 and then is connected with a fifth pin of the singlechip; the third terminal is connected with one end of a seventh resistor R7 and then is connected with a sixth pin of the singlechip; the fourth terminal is connected with one end of an eighth resistor R8 and then is connected with a seventh pin of the singlechip; the other end of the resistance-type humidity sensor R25 is connected with one end of a fifth resistor R5; the other ends of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are connected with the ground terminal of the first three-terminal regulator IC1 and one end of the ninth resistor R9; the other end of the ninth resistor R9 is connected with a second pin of the singlechip; a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal of the switch K1-1 are all connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the first three-terminal regulator IC1 and one end of a twenty-sixth resistor R26; the other end of the twenty-sixth resistor R26 is connected with one end of the first temperature sensor RT and the fourth pin of the single chip microcomputer, the other end of the first temperature sensor RT is connected with the grounding end of the first three-terminal regulator, and the Vdd end and the VSS end of the single chip microcomputer are respectively connected with the output end of the first three-terminal regulator IC1 and the grounding end.
And further, when the switch is arranged at a mite removing gear, the temperature of the carpet surface is increased to 42-45 ℃, the carpet surface is kept at a constant temperature, dried and dehumidified, the humidity is detected at the same time, the temperature and the dryness are maintained in a mite removing preset time period until the humidity is reduced to be below 50%, after the mite removing effect is achieved, the program is intelligently judged, and the carpet is kept warm or is stopped from being heated. The humidity of the electric blanket is detected by the resistance-type humidity sensor R25 and fed back to the single chip microcomputer, and the temperature of the electric blanket is detected by the first temperature sensor RT and fed back to the single chip microcomputer. When the switches are arranged in a temperature-rising gear, a heat-preserving gear and a sleep gear, different temperatures and working timings of all gears are preset in a program, and the humidity of the gears does not participate in control.
The trigger circuit comprises a fifth diode D5, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a first triode Q1 which form a negative half-wave gate circuit of a trigger signal of the single chip microcomputer; one end of a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14 is connected with the base electrode of the first triode Q1 and the negative electrode of the fifth diode D5 after being connected in parallel, and the other end of the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 after being connected in parallel is connected with the connecting end of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the anode of the fifth diode D5 is connected to the emitter of the first triode Q1 and the GND terminal of the first three-terminal regulator IC 1; the collector of the first transistor Q1 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4.
The power control circuit comprises a first silicon controlled rectifier V1, a second silicon controlled rectifier V2, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a twenty-fourth resistor R24, a third resistor R3, a third diode D3, a fourth diode D4, a sixth capacitor C6 and an inner-layer heating wire; the anode of the first controlled silicon V1 is connected with one end H1 of the inner layer heating wire, the cathode of the second controlled silicon V2 and one end of a sixth capacitor C6; the trigger electrode of the first controllable silicon V1 is connected with the cathode of a fourth diode D4, and the anode of the fourth diode D4 is connected with the cathode of a third diode D3; the anode of the third diode D3 is connected with one end of a third resistor R3; the other end of the third resistor R3 is connected with a second pin of the singlechip IC2 and one end of a ninth resistor R9; the trigger electrode of the second controllable silicon V2 is connected with one end of a twenty-fourth resistor R24; one end of a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17 is connected with the other end of the twenty-fourth resistor R24 and the other end of the sixth capacitor C6 after being connected in parallel, and the other end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 after being connected in parallel is connected with the connecting end of the other end H2 of the inner layer heating wire and the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the cathode of the first controllable silicon V1 is connected with the anode of the second controllable silicon V2 and is connected with the ends connected with the hot melting FT1, the first piezoresistor RV and the first capacitor C1.
Further, the protection circuit comprises an eighth diode D8, a seventh diode D7, a twenty-second resistor R22, a twenty-third resistor R23, a first hot melt FT1 and an outer layer protection wire; one end of the first hot melt FT1 is connected with the output stage 3 of the switch K1, and the installation position of the first hot melt FT1 needs to be tightly clamped between the twenty-second resistor R22 and the twenty-third resistor R23; one end of a twenty-second resistor R22 and a twenty-third resistor R23 are connected in parallel with each other and are connected with the protective wire on the outer layer of the heating blanket, and the other end of the twenty-second resistor R22 and the twenty-third resistor R23 are connected in parallel with the anode of an eighth diode D8 and the anode of a seventh diode D7; the negative electrode of the eighth diode D8 is connected with the connection ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the cathode of the seventh diode D7 is connected with the ends connected with the hot melt FT1, the first piezoresistor RV and the first capacitor C1.
Further, the display circuit includes a sixth diode D6, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a first light emitting diode LED 1; an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21 are connected in parallel, one end of the eighteenth resistor R18 is connected with the cathode of the sixth diode D6, and the other end of the twenty-first resistor R21 is connected with the anode of the first light-emitting diode LED 1; the anode of the sixth diode D6 is connected with the cathode of the eighth diode D8; the cathode of the first LED1 is connected to the cathode of the seventh diode D7.
The invention has the beneficial effects that:
1. generally, the voltage dependent resistor and the capacitor are connected in parallel to absorb pulse interference, and meanwhile, the self-recovery fuse is connected in series in the power circuit to block large current formed by pulse interference lower than the limit value of the voltage dependent resistor; the negative half-wave gate circuit of the singlechip trigger signal is formed by the triode, so that zero-crossing triggering is realized, and the interference on the power grid environment is avoided; the mite removal is realized by a combination mode of human body contact safety temperature and dehumidification drying, and low-temperature scalding or heat radiation injury to a user possibly caused by high-temperature mite removal is avoided.
2. Specifically, the control power supply circuit part of this application, the DC voltage and the electric current of whole circuit demand of exportable, and simultaneously when having the impulse interference who is higher than piezo-resistor limit value voltage to appear in the electric wire netting, piezo-resistor can absorb, when having the impulse interference who is less than piezo-resistor limit value voltage to appear in the electric wire netting, the self-resuming fuse can block the electric current that it formed, and X2 electric capacity can absorb it simultaneously to protection electric blanket circuit safety.
3. Specifically, a mite killing control program is preset in a single chip microcomputer in the circuit, a power control circuit executes a program (logic of temperature, humidity and time) instruction to change the heating power, the temperature is increased while humidity is measured, the heating temperature is no more than 45 ℃ at most, the temperature is continuously reduced to below 50% of the humidity at which mites cannot survive until the humidity of the electric blanket is reduced, then the temperature is gradually reduced to 36-37 ℃, and the constant temperature is kept dry until the timing is finished, so that the purpose of safe mite killing is achieved. The problem that the current electric blanket removes mites at high temperature and can cause low-temperature scald or heat radiation diseases of a user is solved. When the switches are arranged in a temperature-rising gear, a heat-preservation gear and a sleep gear, different temperatures and working timings of all gears are preset in a program, the humidity of the gears does not participate in control, and only logic instructions of the temperature and the time are executed.
Drawings
Fig. 1 is a circuit structure diagram of the present application.
Detailed Description
The invention is further described by way of example with reference to the accompanying drawings in which:
in the embodiment, the heating wire of the electric blanket adopts a double-layer structure, an inner layer heating wire and an outer layer protection wire; a fusible insulating layer is arranged between the heating wire and the protective wire.
Example 1
As shown in fig. 1, a safe mite-killing electric blanket control circuit meeting electromagnetic compatibility requirements comprises a power supply circuit, a single chip microcomputer control circuit, a trigger circuit, a power control circuit, a multi-gear sliding combination switch (namely K1 and K1-1) with a double-pole single-throw structure, a protection circuit and a display circuit; wherein the power supply circuit is connected with the singlechip control circuit and the trigger circuit; the singlechip control circuit is connected with the trigger circuit and the power control circuit; the switch K1-1 is connected with the singlechip control circuit; the switch K1 is connected with the power supply circuit, the power control circuit and the trigger circuit; the display circuit is connected with the power supply circuit; the power supply circuit is connected with the heating element through a main controllable silicon V1 and a slave controllable silicon V2 in the power control circuit, and the protection circuit is connected with the power supply circuit. The invention has the characteristics of strong continuous voltage interference resistance, no interference to other electrical appliances during working and automatic power-off during abnormal working; and the singlechip is preset with gear function control programs such as mite removal, temperature rise, heat preservation, sleep and the like, different functions comprise different temperature rise rates, temperature rise limit values and heat preservation time, and particularly, the mite removal function is a logic combination program of temperature, dehumidification and time: the temperature for removing the mites is 42-45 ℃ (the temperature is not more than 45 ℃ of the safe contact temperature of human bodies), and meanwhile, the mites are removed by dehumidifying and drying until the humidity is less than 50 percent.
The singlechip in the singlechip control circuit is preset with control programs of four gears of mite removal, preheating, heat preservation and sleeping, wherein:
and (3) removing mites: the average heating rate is 0.8-1 deg.C/min, the temperature is raised to 42-45 deg.C, and the maximum temperature is 45 deg.C. Measuring the humidity while heating, continuously dehumidifying at constant temperature and starting timing when the humidity is reduced to 40% -50%, and starting cooling after 60-120 minutes: the temperature reduction rate is 1 ℃ every 15 minutes until the temperature is reduced to 36-37 ℃, the constant temperature is maintained to be dry, and the set range of the work timing of mite removal is 6-10 hours;
preheating and temperature rising procedures: heating and preheating for 1.5-3.5 hours, heating to 42-45 ℃ and keeping the temperature, wherein the maximum temperature limit value is 45 ℃, the heating timing is finished after 1.5-3.5 hours, time ratio control is switched to, the maximum average power is controlled, and the ratio of power-on time to power-off time is 30 s: 10s (P =3: 1), controlling the temperature to be 39-40 ℃ at the highest limit and 35-37 ℃ at the lowest limit; the working timing setting range is 1-12 hours or is not timed for a long time;
and (3) heat preservation procedure: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 30 s: 30s (P =1: 1), and controlling the highest temperature of 36-37 ℃; the working timing setting range is 1-12 hours or is not timed for a long time;
a sleep program: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 10 s: 30s (P =1: 3), and controlling the temperature to be the highest limit temperature of 20-22 ℃; the working timing is set within the range of 1-12 hours or is indefinite for a long time.
All the heating and conducting instructions are sent out when the single chip microcomputer detects that the phase of the alternating current passes through zero, the humidity of the electric blanket is detected by the resistance-type humidity sensor R25 and fed back to the single chip microcomputer, and the temperature of the electric blanket is detected by the first temperature sensor RT and fed back to the single chip microcomputer.
The mains supply is connected to a power supply circuit through a switch K1, and the power supply circuit comprises a first current fuse FU, a first voltage dependent resistor RV, a first capacitor C1, a first self-recovery fuse RZ, a first resistor R1, a second resistor R2, a second capacitor C2, a first diode D1, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first voltage-stabilizing tube ZD1 and a first three-terminal voltage-stabilizing device IC 1; input electrodes 2 and 4 of a switch K1 are respectively connected with two electrodes L, N of a mains supply, a K1 output electrode 1 corresponding to the input electrode 2 of K1 is connected with one end of a first current fuse FU, and a K1 output electrode 3 corresponding to the input electrode 4 of K1 is connected with one end of a first hot melt FT1 in the protection circuit; one end of a first capacitor C1 is connected with the other end of the first current fuse FU after being connected with the first piezoresistor RV in parallel, and the other end of the first capacitor C1 is connected with the other end of the first hot melt FT1 after being connected with the first piezoresistor RV in parallel; one end of the first self-recovery fuse RZ is connected with the connecting ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the other end of the first self-recovery fuse RZ is connected with one end of a first resistor R1; one end of a second capacitor C2 is connected with the other end of the first resistor R1 after being connected with the second resistor R2 in parallel; the second capacitor C2 is connected with the second resistor R2 in parallel, and the other end of the second capacitor C2 is connected with the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is connected with the connection ends of the first capacitor C1, the first piezoresistor RV and the first hot melt FT 1; after being connected in parallel, a first voltage-regulator tube ZD1, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the negative electrode of the first voltage-regulator tube ZD1 is connected with the negative electrode of a first diode D1, and after being connected in parallel, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the positive electrode of the first voltage-regulator tube ZD1 is connected with the positive electrode of a second diode D2; the input end of the first three-terminal regulator IC1 is connected with the cathode of the first diode D1, and the grounding end of the first three-terminal regulator IC1 is connected with the anode of the second diode D2; one end of the fifth capacitor C5 is connected to the output terminal of the first three-terminal regulator IC1, and the other end of the fifth capacitor C5 is connected to the ground terminal of the first three-terminal regulator IC 1.
Example 2
As shown in fig. 1, the safe mite-killing electric blanket control circuit meeting the electromagnetic compatibility requirement comprises a power supply circuit, a single chip microcomputer control circuit, a trigger circuit, a power control circuit, a multi-gear sliding combination switch (namely K1 and K1-1) with a double-pole single-throw structure, a protection circuit and a display circuit.
As shown in fig. 1, the safe mite-killing electric blanket control circuit meeting the electromagnetic compatibility requirement comprises a power supply circuit, a single chip microcomputer control circuit, a trigger circuit, a power control circuit, a multi-gear sliding combination switch (namely K1 and K1-1) with a double-pole single-throw structure, a protection circuit and a display circuit.
The singlechip in the singlechip control circuit is preset with control programs of four gears of mite removal, preheating, heat preservation and sleeping, wherein:
and (3) removing mites: the average heating rate is 0.9 ℃/min, and the temperature is raised to 43 ℃ and kept constant. Measuring humidity while heating, when the humidity is reduced to 45%, continuing constant-temperature dehumidification and starting timing, and after 100 minutes, starting cooling: the temperature reduction rate is 1 ℃ every 15 minutes until the temperature is reduced to 36 ℃ and the constant temperature is maintained to be dry, and the set range of the work timing of mite removal is 8 hours;
preheating and temperature rising procedures: heating and preheating for 2 hours, heating to 42 ℃ for constant temperature, ending the heating timing within 2.5 hours, switching to time ratio control, controlling the maximum average power, and controlling the power-on/power-off time ratio to be 30 s: 10s (P =3: 1), controlling the maximum temperature to be 39 ℃ and the minimum temperature to be 36 ℃; the working timing setting range is 6 hours or is not fixed for a long time;
and (3) heat preservation procedure: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 30 s: 30s (P =1: 1), and controlling the temperature to be at the maximum limit temperature of 37 ℃; the working timing setting range is 8 hours or is not constant for a long time;
a sleep program: and directly entering time proportional control to control the maximum average power. The power-on/power-off time ratio is 10 s: 30s (P =1: 3), the temperature is controlled to be maximum 20 ℃; the operation timing is set within a range of 8 hours or indefinitely.
The power supply circuit includes: the self-recovery fuse circuit comprises a first current fuse FU, a first piezoresistor RV, a first capacitor C1, (the first piezoresistor RV is connected with a first capacitor C1 in parallel), a self-recovery fuse RZ, a first resistor R1, a second resistor R2, a second capacitor C2, a first diode D1, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first voltage regulator tube ZD1 and a three-terminal regulator IC 1. The 2 and 4 ends of the K1 switch are respectively connected with the L and N of the commercial power; one end of a hot melt FT1 in the protection circuit is connected with the 3 end of a K1. The 1 end of the K1 switch is connected with one end of the first current fuse FU; one end of a first capacitor C1 is connected with the other end of the first current fuse FU after being connected with a first piezoresistor RV in parallel, and the other end of the first capacitor C1 is connected with the other end of the hot melt FT1 and a connector II after being connected with the first piezoresistor RV in parallel; one end of the self-recovery fuse Rz is connected with the connecting ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV, and the other end of the self-recovery fuse Rz is connected with one end of the first resistor R1; one end of a second capacitor C2 is connected with the other end of the first resistor R1 after being connected with a second resistor R2 in parallel, and the other end of the second capacitor C2 is connected with the anode of a first diode D1 and the cathode of a second diode D2 after being connected with a second resistor R2 in parallel; the anode of the second diode D2 is connected with a joint II; one end of a cathode of a ZD1 is connected with a cathode of a first diode D1 and an in end of a three-terminal regulator IC1 after the third capacitor C3, the fourth capacitor C4 and the first voltage regulator ZD1 are connected in parallel, and one end of an anode of a ZD1 is connected with an anode of a second diode D2 and a gnd end of the three-terminal regulator IC1 after the third capacitor C3, the fourth capacitor C4 and the first voltage regulator ZD1 are connected in parallel; one end of the fifth capacitor C5 is connected to the out terminal of the IC1, and the other end of the fifth capacitor C5 is connected to the gnd terminal of the IC 1. The power circuit completes the conversion of commercial power from alternating current 220V to direct current 5V and provides the voltage and current required by the singlechip control circuit; meanwhile, the power circuit provides a power circuit for the power control circuit, the protection circuit and the trigger circuit through the connector I and the connector II; the power supply circuit adopts the first piezoresistor RV, so that the pulse interference higher than the limit voltage of the first piezoresistor RV is absorbed, when the pulse interference lower than the limit voltage of the first piezoresistor RV occurs in a power grid, the self-recovery fuse RZ can block the current formed by the self-recovery fuse RZ, and meanwhile, the C2 can absorb the pulse interference, so that the safety of the electric blanket circuit is protected.
The control circuit of the singlechip in the embodiment is a singlechip IC2 capable of presetting control program software, a resistor R4-9, a resistor twenty-sixth resistor R26, a resistor-type humidity sensor R25 and a first temperature sensor RT. The 8 th pin VSS of the singlechip IC2 is connected with the GND end of the three-terminal regulator IC1, and the 1 st pin Vdd of the singlechip IC2 is connected with the 0ut pin of the IC 1; a 2 nd pin of IC2 is connected with one end of a third resistor R3 and one end of a ninth resistor R9, a 3 rd pin of IC2 is connected with one end of a resistance-type humidity sensor R25 and a 1 st pin of K1-1, a 5 th pin of a singlechip IC2 is connected with one end of a sixth resistor R6 and the 2 nd pin of K1-1, a 6 th pin of IC2 is connected with one end of a seventh resistor R7 and the 3 rd pin of K1-1, and a 7 th pin of IC2 is connected with one end of an eighth resistor R8 and the 4 th pin of K1-1; the 4 th pin of the IC2 is connected with one end of a twenty-sixth resistor R26 and one end of a first temperature sensor RT, the 5-8 pins of K1-1 are connected with one end of R4, the other end of R4 and the other end of the twenty-sixth resistor R26 are connected with the out pin of the IC1, the other end of the resistance humidity sensor R25 is connected with one end of R5, and the other end of R5-8 is connected with GND of the IC1, the other end of a ninth resistor R9 and the other end of the first temperature sensor RT. The K1-1 switch pins are divided into 4 groups: 1-8, 2-7, 3-6 and 4-5, when each group of pins are connected, the corresponding pins 3, 5, 6 and 7 of the single chip receive input signals, and the 2 nd pin of the single chip outputs a trigger signal to control the power control circuit. When the mite removing gear is switched on, namely 1-8 of K1-1 is switched on, the single chip microcomputer selects a corresponding control program to execute according to a voltage division signal, namely a real-time humidity signal, at the joint of the R4 and the resistance-type humidity sensor R25 and a voltage division signal, namely a real-time temperature signal, at the joint of the twenty-sixth resistor R26 and the first temperature sensor RT.
The trigger circuit in the embodiment comprises a diode fifth diode D5, a resistor R12-14 and a triode first triode Q1 which form a negative half-wave gate circuit of a trigger signal of the singlechip, wherein one end of the resistor R12-14 is connected with the base electrode of the first triode Q1 and the negative electrode of the fifth diode D5 after being connected in parallel, and the other end of the resistor R12-14 is connected with a connector I after being connected in parallel; the anode of the fifth diode D5 is connected to the emitter of the first triode Q1 and the GND terminal of the IC 1; the collector of the first transistor Q1 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4. When the single chip microcomputer sends out a trigger signal, only when the end L of the alternating current is in a negative half cycle, the first triode Q1 is not conducted, and the trigger signal sent out by the 2 nd pin of the IC2 is allowed to pass through. The main controllable silicon V1 in the power control circuit is a one-way controllable silicon, when the alternating current L end changes from negative half cycle to positive half cycle to zero, the first controllable silicon V1 is conducted, and accurate zero-crossing triggering is achieved.
In this embodiment, the power control circuit includes a first thyristor V1, a second thyristor V2, resistors R15-17, a twenty-fourth resistor R24, a third resistor R3, a third diode D3, a fourth diode D4, and a sixth capacitor C6. The anode of the first controlled silicon V1 is connected with one end H1 of the inner layer heating wire, the cathode of the second controlled silicon V2 and one end of a sixth capacitor C6, and the trigger electrode of the first controlled silicon V1 is connected with the cathode of a fourth diode D4; the anode of the third diode D3 is connected with one end of a third resistor R3; the negative electrode of the third diode D3 is connected with the positive electrode of the fourth diode D4, the other end of the third resistor R3 is connected with the 2 nd pin of the IC2 and the ninth resistor R9, the trigger electrode of the second controllable silicon V2 is connected with one end of the twenty-fourth resistor R24, one end of the resistor R15-17 is connected with the other end of the twenty-fourth resistor R24 and the other end of the sixth capacitor C6 after being connected in parallel, the other end of the resistor R15-17 is connected with the inner layer heating wire H2 and the connector head I after being connected in parallel, and the cathode of the first controllable silicon V1 is connected with the anode of the second controllable silicon V2 and is connected with the connector head II at the same time. Only after the master thyristor V1 is conducted in the positive half cycle of the alternating current L end, the slave thyristor V2 can be conducted in the negative half cycle of the alternating current L end.
The protection circuit of the embodiment comprises a hot melt FT1, resistors R22-23, an eighth diode D8 and a seventh diode D7. The negative electrode of the eighth diode D8 is connected with the connector lug I, the negative electrode of the seventh diode D7 is connected with the connector lug II, and the positive electrode of the eighth diode D8 is connected with the positive electrode of the seventh diode D7; one end of a twenty-second resistor R22 is connected with the anode of the eighth diode D8 after being connected with a twenty-third resistor R23 in parallel, and the other end of the twenty-second resistor R22 is connected with the outer layer protection wire after being connected with a twenty-third resistor R23 in parallel. The actual installation position of the hot melt FT1 needs to be clamped between a twenty-second resistor R22 and a twenty-third resistor R23, one end of the hot melt FT1 is connected with the 3 rd end of the K1, and the other end of the hot melt FT1 is connected with a connector II. When the inner layer heating wire and the outer layer protection wire of the heating wire of the electric blanket are in short circuit, 220V alternating current can pass through the twenty-second resistor R22 and the twenty-third resistor R23 in a short time, and the resistors generate heat, so that the hot melting FT1 is disconnected.
The display circuit of the embodiment comprises a diode D6, resistors R18-21 and a light emitting diode LED 1. The positive electrode of D6 is connected with a connector I; one end of the resistor R18-21 is connected with the negative electrode of the D6 after being connected in parallel, and the other end of the resistor R18-21 is connected with the positive electrode of the first light-emitting diode LED1 after being connected in parallel; the cathode of the first light-emitting diode LED1 is connected with a connector plug II. When the electric blanket circuit is powered on after the K1 is closed, the first light-emitting diode LED1 emits light to indicate the working state.
In summary, the embodiments of the present invention are only examples, and should not be construed as limiting the scope of the invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should fall within the technical scope of the present invention.

Claims (8)

1. The utility model provides a satisfy safe mite electric blanket control circuit that removes of electromagnetic compatibility requirement which characterized in that: the device comprises a power supply circuit, a singlechip control circuit, a trigger circuit, a power control circuit, a multi-gear sliding combination switch with a double-pole single-throw structure, a protection circuit and a display circuit; wherein the power supply circuit is connected with the singlechip control circuit and the trigger circuit; the singlechip control circuit is connected with the trigger circuit and the power control circuit; the multi-gear sliding combination switch comprises a switch K1 and a switch K1-1, wherein the switch K1-1 is connected with the singlechip control circuit; the switch K1 is connected with the power supply circuit, the power control circuit and the trigger circuit; the display circuit is connected with the power supply circuit; the power supply circuit is connected with the heating element through a main controllable silicon V1 and a slave controllable silicon V2 in the power control circuit, and the protection circuit is connected with the power supply circuit at the same time;
the singlechip in the singlechip control circuit is preset with control programs of four gears of mite removal, preheating, heat preservation and sleeping, wherein:
and (3) removing mites: the average heating rate is 0.8-1 ℃/min, the temperature is raised to 42-45 ℃ and is constant, and the maximum temperature limit value is 45 ℃;
measuring the humidity while heating, continuously dehumidifying at constant temperature and starting timing when the humidity is reduced to 40% -50%, and starting cooling after 60-120 minutes: the temperature reduction rate is 1 ℃ every 15 minutes until the temperature is reduced to 36-37 ℃, the constant temperature is maintained to be dry, and the set range of the work timing of mite removal is 6-10 hours;
preheating and temperature rising procedures: heating and preheating for 1.5-3.5 hours, heating to 42-45 ℃ and keeping the temperature, wherein the maximum temperature limit value is 45 ℃, the heating timing is finished after 1.5-3.5 hours, the time ratio is controlled to control the maximum average power, and the power-on time and the power-off time ratio is 30 s: 10s (P =3: 1), controlling the temperature to be 39-40 ℃ at the highest limit and 35-37 ℃ at the lowest limit; the working timing setting range is 1-12 hours or is not timed for a long time;
and (3) heat preservation procedure: directly entering time proportional control to control the maximum average power;
the power-on/power-off time ratio is 30 s: 30s (P =1: 1), and controlling the highest temperature of 36-37 ℃; the working timing setting range is 1-12 hours or is not timed for a long time;
a sleep program: directly entering time proportional control to control the maximum average power;
the power-on/power-off time ratio is 10 s: 30s (P =1: 3), and controlling the temperature to be the highest limit temperature of 20-22 ℃; the working timing setting range is 1-12 hours or is not timed for a long time;
all the heating and conducting instructions are sent out when the single chip microcomputer detects that the phase of the alternating current passes through zero, the humidity of the electric blanket is detected by the resistance-type humidity sensor R25 and fed back to the single chip microcomputer, and the temperature of the electric blanket is detected by the first temperature sensor RT and fed back to the single chip microcomputer.
2. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein:
the mains supply is connected to a power supply circuit through a switch K1, and the power supply circuit comprises a first current fuse FU, a first voltage dependent resistor RV, a first capacitor C1, a first self-recovery fuse RZ, a first resistor R1, a second resistor R2, a second capacitor C2, a first diode D1, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first voltage-stabilizing tube ZD1 and a first three-terminal voltage-stabilizing device IC 1; input electrodes 2 and 4 of a switch K1 are respectively connected with two electrodes L, N of a mains supply, a K1 output electrode 1 corresponding to the input electrode 2 of K1 is connected with one end of a first current fuse FU, and a K1 output electrode 3 corresponding to the input electrode 4 of K1 is connected with one end of a first hot melt FT1 in the protection circuit; one end of a first capacitor C1 is connected with the other end of the first current fuse FU after being connected with the first piezoresistor RV in parallel, and the other end of the first capacitor C1 is connected with the other end of the first hot melt FT1 after being connected with the first piezoresistor RV in parallel; one end of the first self-recovery fuse RZ is connected with the connecting ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the other end of the first self-recovery fuse RZ is connected with one end of a first resistor R1; one end of a second capacitor C2 is connected with the other end of the first resistor R1 after being connected with the second resistor R2 in parallel; the second capacitor C2 is connected with the second resistor R2 in parallel, and the other end of the second capacitor C2 is connected with the anode of the first diode D1 and the cathode of the second diode D2; the anode of the second diode D2 is connected with the connection ends of the first capacitor C1, the first piezoresistor RV and the first hot melt FT 1; after being connected in parallel, a first voltage-regulator tube ZD1, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the negative electrode of the first voltage-regulator tube ZD1 is connected with the negative electrode of a first diode D1, and after being connected in parallel, a third capacitor C3 and a fourth capacitor C4 are connected in parallel, one end of the positive electrode of the first voltage-regulator tube ZD1 is connected with the positive electrode of a second diode D2; the input end of the first three-terminal regulator IC1 is connected with the cathode of the first diode D1, and the grounding end of the first three-terminal regulator IC1 is connected with the anode of the second diode D2; one end of the fifth capacitor C5 is connected to the output terminal of the first three-terminal regulator IC1, and the other end of the fifth capacitor C5 is connected to the ground terminal of the first three-terminal regulator IC 1.
3. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein: the single chip microcomputer control circuit comprises a single chip microcomputer IC2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a twenty-sixth resistor R26, a resistance-type humidity sensor R25 and a first temperature sensor RT, wherein control program software can be preset in the single chip microcomputer control circuit; a first wiring end of the switch K1-1 is connected with one end of the resistance-type humidity sensor R25 and then connected with a third pin of the single chip microcomputer; the second terminal is connected with one end of a sixth resistor R6 and then is connected with a fifth pin of the singlechip; the third terminal is connected with one end of a seventh resistor R7 and then is connected with a sixth pin of the singlechip; the fourth terminal is connected with one end of an eighth resistor R8 and then is connected with a seventh pin of the singlechip; the other end of the resistance-type humidity sensor R25 is connected with one end of a fifth resistor R5; the other ends of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are connected with the ground terminal of the first three-terminal regulator IC1 and one end of the ninth resistor R9; the other end of the ninth resistor R9 is connected with a second pin of the singlechip; a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal of the switch K1-1 are all connected with one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with the output end of the first three-terminal regulator IC1 and one end of a twenty-sixth resistor R26; the other end of the twenty-sixth resistor R26 is connected with one end of the first temperature sensor RT and the fourth pin of the single chip microcomputer, the other end of the first temperature sensor RT is connected with the grounding end of the first three-terminal regulator, and the Vdd end and the VSS end of the single chip microcomputer are respectively connected with the output end of the first three-terminal regulator IC1 and the grounding end.
4. The electric blanket control circuit for safe mite killing meeting the electromagnetic compatibility requirement as claimed in claim 2, wherein: the humidity signal of the electric blanket is detected by the resistance-type humidity sensor R25 and fed back to the single chip microcomputer, and the temperature signal of the electric blanket is detected by the first temperature sensor RT and fed back to the single chip microcomputer.
5. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein: the trigger circuit comprises a fifth diode D5, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a first triode Q1 which form a negative half-wave gate circuit of a trigger signal of the single chip microcomputer; one end of a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14 is connected with the base electrode of the first triode Q1 and the negative electrode of the fifth diode D5 after being connected in parallel, and the other end of the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 after being connected in parallel is connected with the connecting end of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the anode of the fifth diode D5 is connected to the emitter of the first triode Q1 and the GND terminal of the first three-terminal regulator IC 1; the collector of the first transistor Q1 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4.
6. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein: the power control circuit comprises a first silicon controlled rectifier V1, a second silicon controlled rectifier V2, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a twenty-fourth resistor R24, a third resistor R3, a third diode D3, a fourth diode D4, a sixth capacitor C6 and an inner-layer heating wire; the anode of the first controlled silicon V1 is connected with one end H1 of the inner layer heating wire, the cathode of the second controlled silicon V2 and one end of a sixth capacitor C6; the trigger electrode of the first controllable silicon V1 is connected with the cathode of a fourth diode D4, and the anode of the fourth diode D4 is connected with the cathode of a third diode D3; the anode of the third diode D3 is connected with one end of a third resistor R3; the other end of the third resistor R3 is connected with a second pin of the singlechip IC2 and one end of a ninth resistor R9; the trigger electrode of the second controllable silicon V2 is connected with one end of a twenty-fourth resistor R24; one end of a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17 is connected with the other end of the twenty-fourth resistor R24 and the other end of the sixth capacitor C6 after being connected in parallel, and the other end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 after being connected in parallel is connected with the connecting end of the other end H2 of the inner layer heating wire and the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the cathode of the first controllable silicon V1 is connected with the anode of the second controllable silicon V2 and is connected with the ends connected with the hot melting FT1, the first piezoresistor RV and the first capacitor C1.
7. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein: the protection circuit comprises an eighth diode D8, a seventh diode D7, a twenty-second resistor R22, a twenty-third resistor R23, a first hot melting FT1 and an outer layer protection wire; one end of the first hot melt FT1 is connected with the output stage 3 of the switch K1, and the installation position of the first hot melt FT1 needs to be tightly clamped between the twenty-second resistor R22 and the twenty-third resistor R23; one end of a twenty-second resistor R22 and a twenty-third resistor R23 are connected in parallel with each other and are connected with the protective wire on the outer layer of the heating blanket, and the other end of the twenty-second resistor R22 and the twenty-third resistor R23 are connected in parallel with the anode of an eighth diode D8 and the anode of a seventh diode D7; the negative electrode of the eighth diode D8 is connected with the connection ends of the first current fuse FU, the first capacitor C1 and the first piezoresistor RV; the cathode of the seventh diode D7 is connected with the ends connected with the hot melt FT1, the first piezoresistor RV and the first capacitor C1.
8. The electric blanket control circuit meeting the electromagnetic compatibility requirement for safe mite removal of claim 1, wherein: the display circuit comprises a sixth diode D6, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21 and a first light emitting diode LED 1; an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20 and a twenty-first resistor R21 are connected in parallel, one end of the eighteenth resistor R18 is connected with the cathode of the sixth diode D6, and the other end of the twenty-first resistor R21 is connected with the anode of the first light-emitting diode LED 1; the anode of the sixth diode D6 is connected with the cathode of the eighth diode D8; the cathode of the first LED1 is connected to the cathode of the seventh diode D7.
CN202010669485.9A 2020-07-13 2020-07-13 Safe mite-killing electric blanket control circuit meeting electromagnetic compatibility requirement Active CN111741546B (en)

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