CN213244370U - Heating system with protection mechanism - Google Patents
Heating system with protection mechanism Download PDFInfo
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- CN213244370U CN213244370U CN202021611045.XU CN202021611045U CN213244370U CN 213244370 U CN213244370 U CN 213244370U CN 202021611045 U CN202021611045 U CN 202021611045U CN 213244370 U CN213244370 U CN 213244370U
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Abstract
The utility model discloses a heating system with protection mechanism, including treater, switch circuit, heating blanket and detection circuitry, switch circuit includes silicon controlled rectifier D6, silicon controlled rectifier D6's T2 end connects the one end of heating power supply after the blanket series connection that generates heat, and silicon controlled rectifier D6's T1 end is connected to the other end of heating power supply, detection circuitry including divider resistor R5 and thermistor R7 of establishing ties, the heating power supply is connected to divider resistor R5 one end, and the other end is through thermistor R7 ground connection, thermistor R7 laminate to silicon controlled rectifier D6 on, thermistor R7 connects divider resistor R5's one end and still is connected to the treater. The utility model has the advantages that it sets up a thermistor to locate the laminating at the silicon controlled rectifier for the temperature of test silicon controlled rectifier cuts the silicon controlled rectifier promptly when the temperature that tests reaches the settlement temperature, thereby has protected the silicon controlled rectifier.
Description
Technical Field
The utility model relates to an electricity field, concretely relates to heating system with protection mechanism.
Background
The electric heater is an electric appliance which achieves a heating effect by utilizing electric energy, is distinguished according to the type of a heating mode and can be divided into three types:
1. electromagnetic heating: the electromagnetic heating is to generate an alternating magnetic field through the components of the electronic circuit board, when the ferrous container is placed on the iron-containing container, the surface of the container cuts the alternating magnetic lines of force to generate alternating current (namely eddy current) on the metal part at the bottom of the container, the eddy current enables iron atoms at the bottom of the container to move randomly at high speed, and the atoms collide and rub with each other to generate heat energy. Thereby achieving the effect of heating the article. Since the iron vessel itself generates heat, the overall heat conversion is particularly high, up to 95%. Electromagnetic heating technology is adopted for both induction cookers and induction cookers.
2. Infrared heating: infrared heat transfer is in the form of radiative heat transfer, with energy transferred by electromagnetic waves. When far infrared rays are irradiated to an object to be heated, a part of the rays is reflected and a part is transmitted. When the wavelength of the emitted far infrared ray is consistent with the absorption wavelength of the heated object, the heated object absorbs the far infrared ray, at the moment, molecules and atoms in the object generate resonance to generate strong vibration and rotation, and the vibration and the rotation increase the temperature of the object, thereby achieving the purpose of heating.
3. Resistance heating: a heating method for heating a material by discharging heat through an electric heater by using electric current. Common resistance wire heating, ceramic heater, resistance coil heating and quartz tube heating belong to resistance type heating in principle.
Resistance heating is more extensive in daily use, like electric kettle, also has to design small and exquisite with electric kettle now, obtains the electric heat cup that can use in the hand, structural difference, especially in the control, all adopts the silicon controlled rectifier as resistance heating's switch, but because the design is small, relatively poor on heat dispersion, the incident that the silicon controlled rectifier high temperature damaged often appears takes place.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
An object of the utility model is to provide a heating system with protection mechanism for solve the problem that the silicon controlled rectifier in use often appears the high temperature damage in current electric heat cup.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a heating system with protection mechanism is provided, which includes a processor, a switching circuit, a heater blanket, and a detection circuit, wherein the switching circuit includes a thyristor D6 and a variable resistor R8, a T2 terminal of the thyristor D6 is connected to one end of a heating power supply after being connected in series via the heater blanket, a T1 terminal of the thyristor D6 is connected to the other end of the heating power supply, a variable resistor R8 is connected to both ends of the heating power supply, a collector of a transistor Q1 is connected to a T1 terminal of a thyristor D6 via a resistor R10 and a resistor R11 in turn, a control terminal of the thyristor D6 is also connected to a collector of a transistor Q1 via a resistor R10, an emitter of the transistor Q1 is grounded, and a control terminal of the variable resistor R8 and a base of a transistor Q1 are both connected;
detection circuitry include divider resistor R5 and thermistor R7 of establishing ties, divider resistor R5 one end is connected the heating power, and the other end is through thermistor R7 ground connection, thermistor R7 laminate to on the silicon controlled rectifier D6, thermistor R7 connects divider resistor R5's one end and still is connected to the treater.
A thermistor R7 is attached to the controllable silicon D6, after the controllable silicon D6 heats, the resistance of the thermistor R7 increases, the voltage signal transmitted to the processor is analyzed by the processor, and the controllable silicon D6 is turned off after the voltage signal reaches a set value, so that the controllable silicon D6 is prevented from being damaged.
In one possible design, a rectifying and filtering circuit is arranged between the detection circuit and the heating power supply, the rectifying and filtering circuit comprises a diode D2, a diode D3 and an inductor L2 which are connected in series, the anode of the diode D2 is connected to the heating power supply, the cathode of the diode D2 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the detection circuit through an inductor L2, and two ends of the inductor L2 are further grounded through a capacitor C6 and a capacitor C7, respectively. When the heating power supply directly adopts the commercial power, the test at the thermistor R7 is not accurate, so a rectifying circuit formed by combining the diode D2 and the diode D3 and a filter circuit formed by combining the inductor L2, the capacitor C6 and the capacitor C7 need to be designed to obtain a direct current, thereby facilitating the test of the detection circuit.
In one possible design, the heating system further includes a zero-point test circuit including a transistor Q3, the base of the transistor Q3 is connected to the negative terminal of the diode D2, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to a power supply, and the collector of the transistor Q3 is further connected to the processor. Can obtain a zero point value, also when heating power supply is the commercial power, can know the definite time of interchange through this zero point value, can open silicon controlled rectifier D6 in the twinkling of an eye of transform, avoided silicon controlled rectifier D6 to open the back, when passing through high voltage in the twinkling of an eye, lead to switching loss to increase and the damage that produces.
In one possible design, a protection resistor R20 is provided between the base of the transistor Q3 and the cathode of the diode D2. Preventing high voltage breakdown of transistor Q3.
In one possible design, a protection resistor R19 is provided between the collector of the transistor Q3 and the power supply.
In one possible design, one end of the thermistor R7 connected to the voltage divider resistor R5 is further connected to a grounding capacitor C8. This capacitor C8 also has a filtering effect.
In one possible design, a protective resistor R4 is provided between the anode of the diode D2 and the heating power supply. Avoiding high voltage breakdown of diode D2 and diode D3.
In one possible design, the thyristor D6 is connected in parallel with a first filter, and the first filter includes a resistor R9 and a capacitor C9 connected in series.
In a possible design, the heating system further includes a trigger circuit, the switch circuit includes a switch J1 and a resistor R1, one end of the resistor R1 is connected to the power supply, the other end of the resistor R1 is connected to the ground via the switch J1, and one end of the resistor R1 connected to the switch J1 is further connected to the processor. The trigger circuit signals the processor primarily to initiate heating.
In one possible design, a signal transceiver is connected to the processor to receive wireless signals to control the circuit.
The utility model discloses at least, include following beneficial effect: (1) a thermistor is attached to the controllable silicon and used for testing the temperature of the controllable silicon, and the controllable silicon is cut off when the tested temperature reaches a set temperature, so that the controllable silicon is protected;
(2) a zero point detection circuit is arranged and connected with a heating power supply through a capacitor, and when the alternating current is tested to change, the controllable silicon D6 is started at zero voltage, so that the driving power of the controllable silicon is reduced, and the interference generated when the controllable silicon is triggered is reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic diagram of a circuit configuration of a processor;
FIG. 3 is a circuit diagram of the connection of the heat blanket and the switch circuit;
FIG. 4 is a schematic circuit diagram of the detection circuit;
FIG. 5 is a schematic circuit diagram of a zero test circuit;
FIG. 6 is a schematic diagram of a circuit structure of the trigger circuit;
fig. 7 is a block diagram of a configuration in which a wireless transceiver is used.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited to the description. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. The present invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
1-7, a heating system with protection mechanism, comprising a processor, a switching circuit, a heating blanket and a detection circuit, wherein the switching circuit comprises a thyristor D6 and a variable resistor R8, the T2 end of the thyristor D6 is connected in series with the heating blanket to one end of a heating power supply, the T1 end of the thyristor D6 is connected to the other end of the heating power supply, the variable resistor R8 is connected to both ends of the heating power supply, the collector of a transistor Q1 is connected to the T1 end of the thyristor D6 through a resistor R10 and a resistor R11 in turn, the control end of the thyristor D6 is also connected to the collector of a transistor Q1 through a resistor R10, the emitter of the transistor Q1 is grounded, and the control end of the variable resistor R8 and the base of a transistor Q1 are both connected to the processor;
detection circuitry include divider resistor R5 and thermistor R7 of establishing ties, divider resistor R5 one end is connected the heating power, and the other end is through thermistor R7 ground connection, thermistor R7 laminate to on the silicon controlled rectifier D6, thermistor R7 connects divider resistor R5's one end and still is connected to the treater.
The heater of this patent sets up in heating the cup, and wherein, the heating blanket is deep in aquatic to heat the water in the inner bag. Switch circuit, treater and detection circuit all set up on the cup bottom of inner bag below, generally can set up the insulating layer between inner bag and cup bottom, avoid the temperature to transmit electronic instrument for electronic instrument can not normally work.
Referring to fig. 2-4, the processor is a chip with model number SC92F8361B, where pins 4-16 are input/output pins, the base of transistor Q1 is connected to pin 4 of the processor, and the control terminal of variable resistor R8 is connected to pin 5. The voltage test terminal of thermistor R7 is connected to pin 7 of the processor.
In the above switching circuit, the T1 terminal of the thyristor D6 is connected to the live wire, the T2 terminal is connected to one end of the heater blanket, and the other end of the heater blanket is connected to the neutral wire.
When the switch circuit of the circuit is switched on and switched off, the processor sends a signal to the triode Q1, so that the triode Q1 is switched on, the control end and the T1 end of the controlled silicon both obtain high potential, and the controlled silicon is switched on. The turn-off is that the current on the thyristor D6 is reduced by reducing the resistance of the variable resistor R8, and the thyristor D6 is turned off when the current is less than the holding current of the thyristor.
The thermistor R7 is arranged at the silicon controlled rectifier D6 in an attaching mode, after the silicon controlled rectifier D6 heats, the resistance of the thermistor R7 becomes large, the voltage is increased, the voltage signal transmitted to the processor is analyzed by the processor, and after the voltage signal reaches a set value, the silicon controlled rectifier D6 is closed, so that the silicon controlled rectifier D6 is prevented from being damaged. Specifically, the thermistor R7 and the voltage dividing resistor R5 are connected in series to the heating power supply, when the thermistor R7 and the resistance become larger, the voltage on the thermistor R7 increases, one end of the thermistor R7 is grounded, the other end is connected to the processor, and the voltage on the thermistor R7 can be detected, so that the processor can judge the temperature around the thermistor when obtaining the rising value of the voltage on the thermistor R7, thereby judging the heating temperature of the thyristor D6, when the temperature is too high, a signal is sent to the variable resistor R8, the resistance value of the variable resistor R8 is reduced, the current on the thyristor D6 is reduced, and when the current is smaller than the holding current of the thyristor, the thyristor D6 is cut off.
A protective resistor R4 is provided between the anode of the diode D2 and the heating power supply. Avoiding high voltage breakdown of diode D2 and diode D3.
In a possible design, as shown in fig. 4, a rectifying and filtering circuit is disposed between the detection circuit and the heating power supply, the rectifying and filtering circuit includes a diode D2, a diode D3 and an inductor L2 connected in series, an anode of the diode D2 is connected to the heating power supply, a cathode of the diode D2 is connected to an anode of the diode D3, a cathode of the diode D3 is connected to the detection circuit through the inductor L2, and two ends of the inductor L2 are further grounded through a capacitor C6 and a capacitor C7, respectively. When the heating power supply directly adopts the commercial power, the test at the thermistor R7 is not accurate, so a rectifying circuit formed by combining the diode D2 and the diode D3 and a filter circuit formed by combining the inductor L2, the capacitor C6 and the capacitor C7 are required to be designed for filtering, and then a direct current can be obtained, thereby facilitating the test of the detection circuit.
One end of the thermistor R7, which is connected with the divider resistor R5, is also connected with a grounding capacitor C8. This capacitor C8 also has a filtering effect.
In one possible design, as shown in fig. 5, the heating system further includes a zero test circuit including a transistor Q3, the base of the transistor Q3 being coupled to the negative terminal of the diode D2, the emitter of the transistor Q3 being coupled to ground, the collector being coupled to a power supply, and the collector of the transistor Q3 being further coupled to the processor. The zero point value can be obtained, when the heating power supply is the mains supply, the determination time of alternating current conversion can be known through the zero point value, the controllable silicon D6 can be started in the conversion moment, namely, the controllable silicon D6 is started in zero voltage, the driving work of the controllable silicon is reduced, and the interference generated when the controllable silicon is triggered is reduced.
A protective resistor R20 is provided between the base of the transistor Q3 and the cathode of the diode D2. Preventing high voltage breakdown of transistor Q3.
A protective resistor R19 is provided between the collector of the transistor Q3 and the power supply.
In one possible design, as shown in fig. 3, a first filter is connected in parallel to the thyristor D6, and the first filter includes a resistor R9 and a capacitor C9 connected in series. When the heating blanket works, the heating circuit may generate some interference currents, and the first filter is mainly used for filtering the interference currents.
In one possible design, as shown in fig. 6, the heating system further includes a trigger circuit, the trigger circuit includes a switch J1 and a resistor R1, one end of the resistor R1 is connected to the power supply, the other end of the resistor R1 is connected to the ground via the switch J1, and one end of the resistor R1 connected to the switch J1 is further connected to the processor. The switch J1 is arranged on the outer side, and the switch J1 adopts a touch switch, namely, after the resistor R1 is connected into the circuit by pressing the switch J1 with a finger, the switch J1 automatically breaks the circuit when the finger is released. However, throughout the process, an electrical signal is sent to pin 15 of the processor, which sends a signal to transistor Q1 to turn on thyristor D6.
The power supply supplies power to the trigger circuit and the processor.
In one possible design, as shown in fig. 7, a signal transceiver is connected to the processor to receive wireless signals to control the circuit. A wireless button switch can be designed at the far end and used for sending signals to the processor to control the heating of the heater. The wireless button switch is AUB1Q1 in type, adopts Bluetooth wireless connection, and the signal transceiver is a Bluetooth transceiver in type E28-2G4M 20S.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (10)
1. A heating system with a protection mechanism is characterized by comprising a processor, a switching circuit, a heating blanket and a detection circuit, wherein the switching circuit comprises a controlled silicon D6 and a variable resistor R8, the end T2 of the controlled silicon D6 is connected with one end of a heating power supply after being connected in series through a heating blanket, the end T1 of the controlled silicon D6 is connected with the other end of the heating power supply, the variable resistor R8 is connected with two ends of the heating power supply, the collector of a triode Q1 is connected to the end T1 of the controlled silicon D6 through a resistor R10 and a resistor R11 in sequence, the control end of the controlled silicon D6 is also connected to the collector of a triode Q1 through R10, the emitter of the triode Q1 is grounded, and the control end of the variable resistor R8 and the base of the triode Q1 are both connected to the processor;
detection circuitry include divider resistor R5 and thermistor R7 of establishing ties, divider resistor R5 one end is connected the heating power, and the other end is through thermistor R7 ground connection, thermistor R7 laminate to on the silicon controlled rectifier D6, thermistor R7 connects divider resistor R5's one end and still is connected to the treater.
2. The heating system as claimed in claim 1, wherein a rectifying and filtering circuit is disposed between the detection circuit and the heating power supply, the rectifying and filtering circuit comprises a diode D2, a diode D3 and an inductor L2 connected in series, an anode of the diode D2 is connected to the heating power supply, a cathode of the diode D2 is connected to an anode of the diode D3, a cathode of the diode D3 is connected to the detection circuit via an inductor L2, and two ends of the inductor L2 are grounded via a capacitor C6 and a capacitor C7, respectively.
3. The heating system as claimed in claim 2, wherein a protective resistor R4 is provided between the anode of the diode D2 and the heating power supply.
4. A heating system as claimed in claim 2 or 3, wherein the heating system further comprises a zero test circuit comprising a transistor Q3, the base of the transistor Q3 being connected to the cathode of the diode D2, the emitter of the transistor Q3 being connected to ground, the collector being connected to a power supply, the collector of the transistor Q3 being further connected to the processor.
5. The heating system as claimed in claim 4, wherein a protective resistor R20 is provided between the base of the transistor Q3 and the cathode of the diode D2.
6. The heating system as claimed in claim 4, wherein a protective resistor R19 is provided between the collector of the transistor Q3 and the power supply.
7. The heating system as claimed in claim 1, wherein the thermistor R7 is further connected to a grounding capacitor C8 at one end connected to the voltage divider R5.
8. The heating system as claimed in claim 1, wherein a first filter is connected in parallel to the thyristor D6, and the first filter comprises a resistor R9 and a capacitor C9 connected in series.
9. The heating system of claim 1, further comprising a trigger circuit, said trigger circuit comprising a switch J1 and a resistor R1, said resistor R1 being connected to a power supply at one end and to ground at the other end via a switch J1, and a resistor R1 connected to a switch J1 at one end and to a processor.
10. The heating system of claim 1, wherein a signal transceiver is further coupled to the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021611045.XU CN213244370U (en) | 2020-08-05 | 2020-08-05 | Heating system with protection mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021611045.XU CN213244370U (en) | 2020-08-05 | 2020-08-05 | Heating system with protection mechanism |
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| CN213244370U true CN213244370U (en) | 2021-05-18 |
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| CN202021611045.XU Active CN213244370U (en) | 2020-08-05 | 2020-08-05 | Heating system with protection mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933620A (en) * | 2021-09-14 | 2022-01-14 | 深圳拓邦股份有限公司 | Heating module state detection circuit and refrigeration equipment |
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2020
- 2020-08-05 CN CN202021611045.XU patent/CN213244370U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933620A (en) * | 2021-09-14 | 2022-01-14 | 深圳拓邦股份有限公司 | Heating module state detection circuit and refrigeration equipment |
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