CN210840079U - Electric blanket and heating control circuit in electric blanket - Google Patents
Electric blanket and heating control circuit in electric blanket Download PDFInfo
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- CN210840079U CN210840079U CN201920682150.3U CN201920682150U CN210840079U CN 210840079 U CN210840079 U CN 210840079U CN 201920682150 U CN201920682150 U CN 201920682150U CN 210840079 U CN210840079 U CN 210840079U
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Abstract
The utility model relates to an electric blanket and a heating control circuit in the electric blanket. The heating control circuit comprises a pressure detection circuit, a main control circuit, a heating wire RL and an on-off control circuit. The heating control circuit can automatically control whether the heating wire works or not according to the resistance value of the pressure detection device, so that the potential safety hazard is reduced.
Description
Technical Field
The utility model relates to an electric heating technology, in particular to an electric blanket and a heating control circuit in the electric blanket.
Background
The electric blanket is a contact type electric heating device and is widely applied to warming in winter.
Conventional electric blankets are typically provided with a manual switch so that they can be manually turned on and off by the user.
The applicant found in the course of implementing the conventional technique that: the traditional electric blanket needs to be manually powered off when the heating is stopped, so that potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
Therefore, the electric blanket and the heating control circuit in the electric blanket need to be provided for solving the problems that the electric blanket in the prior art needs to be manually powered off and has potential safety hazards.
A heating control circuit in an electric blanket comprises at least one pressure detection circuit, a main control circuit, a heating wire RL and an on-off control circuit, wherein the heating wire RL is used for heating the electric blanket: the pressure detection circuit includes a pressure detection device for detecting pressure; the resistance value of the pressure detection device changes along with the pressure applied to the pressure detection device; the pressure detection circuit is connected with a first pin of the main control circuit, and is used for outputting a first electric signal to the main control circuit according to the pressure detected by the pressure detection device, wherein the voltage value of the first electric signal is related to the resistance value of the pressure detection device; a second pin of the main control circuit is connected with a first end of the on-off control circuit, and a second end and a third end of the on-off control circuit are connected in a circuit where the heating wire RL is located; the main control circuit is used for outputting a second electric signal according to the first electric signal, and the on-off control circuit is used for controlling the on-off of a circuit where the heating wire RL is located by controlling the connection between the second end and the third end of the on-off control circuit according to the second electric signal so as to control the heating of the heating wire RL.
The heating control circuit in the electric blanket comprises a pressure detection circuit, a main control circuit, an electric heating wire and an on-off control circuit. When the heating control circuit works, the pressure detection circuit outputs a first electric signal, and the voltage value of the first electric signal is related to the pressure born by the pressure detection device. The main control circuit can output a second electric signal according to the voltage value of the first electric signal transmitted by the pressure detection circuit, so as to control the on-off control circuit to be switched on or off. The heating control circuit can automatically control whether the heating wire works or not according to the resistance value of the pressure detection device, thereby reducing the potential safety hazard of the electric blanket.
An electric blanket comprises a heating control circuit in the electric blanket in any one of the above embodiments, and further comprises an insulating heat conduction layer, wherein the insulating heat conduction layer wraps the heating wire RL, so that the heating wire RL and one side of the insulating heat conduction layer, which is far away from the heating wire RL, are insulated and heat-conducted.
Drawings
Fig. 1 is a schematic diagram of a heating control circuit in an electric blanket according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a heating control circuit in an electric blanket according to another embodiment of the present application.
Fig. 3 is a schematic diagram of a heating control circuit in an electric blanket according to another embodiment of the present application.
Fig. 4 is a schematic view of the position of the insulating and heat conducting layer in an embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. a heating control circuit in the electric blanket;
100. a pressure detection circuit;
110. a pressure detection device;
120. a signal amplifier;
200. a main control circuit;
201. a first pin;
202. a second pin;
400. an on-off control circuit;
410. a switching element;
420. a switch control circuit;
20. an insulating heat conducting layer.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
The application aims at the problem that the electric blanket in the prior art can stop heating only by manually disconnecting the power supply, and provides a heating control circuit 10 in the electric blanket and the electric blanket.
As shown in fig. 1, a heating control circuit 10 in an electric blanket includes a pressure detection circuit 100, a main control circuit 200, a heating wire RL and an on-off control circuit 400.
Specifically, the pressure detection circuit 100 is configured to output a first electrical signal. The pressure detection circuit 100 may include a pressure detection device 110 for detecting pressure. The pressure detection circuit 100 is operatively connected between a power source VCC, which may be a dc power source of any voltage, and a ground GND. The resistance value of the pressure detection device 110 varies with the pressure to which the pressure detection device 110 is subjected. The voltage value of the first electrical signal output by the pressure detection circuit 100 varies with the variation of the resistance of the pressure detection device 110. For example, the relationship between the resistance value of the pressure detecting device 110 and the pressure applied to the pressure detecting device 110 may be a positive linear correlation. That is, when the pressure applied to the pressure detection device 110 is larger, the resistance value of the pressure detection device 110 is larger. Conversely, when the pressure applied to the pressure detection device 110 is smaller, the resistance of the pressure detection device 110 is smaller. The relationship between the voltage value of the first electrical signal and the resistance value of the pressure detecting device 110 may be a negative correlation. That is, when the resistance value of the pressure detection device 110 is larger, the voltage value of the first electrical signal is smaller. Conversely, when the resistance value of the pressure detection device 110 is smaller, the voltage value of the first electrical signal is larger.
The main control circuit 200 may have a first pin 201 and a second pin 202. The first pin 201 can be used as an input pin; the second pin 202 may be an output pin. The first pin 201 is connected to the pressure detection circuit 100, and is used for acquiring the first electrical signal. The main control circuit 200 may output a second electrical signal according to the first electrical signal. Generally, the main control circuit 200 may be a single chip microcomputer. The second electrical signal can be a level signal, and can be used for indicating the on-off circuit to be switched on or off so as to control the on-off of the circuit where the heating wire RL is located. The second electrical signal may specifically be a high level signal or a low level signal.
The heating wire RL may be specifically an electric resistance wire. The heating wire RL may be connected between any power supply VCC1 and the common terminal COM when operating, so as to be electrified and heated. Generally, the arbitrary power source VCC1 may be a dc power source with a voltage sufficient to support the heating wire RL to work, or may be a live wire of a commercial power. The common terminal may be the ground GND.
The on-off control circuit 400 may generally be a three terminal device. That is, the on/off control circuit 400 may include a first terminal, a second terminal, and a third terminal. A first end of the on-off control circuit 400 may be connected to the main control circuit 200 to obtain the second electrical signal. The second end and the third end of the on-off control circuit 400 can be connected in series with the heating wire RL, so that the on-off of the circuit where the heating wire RL is located can be controlled by controlling the on-off of the connection between the second end and the third end of the on-off control circuit (400). Namely, when the second end and the third end of the on-off control circuit 400 are conducted, the circuit where the heating wire RL is located is conducted; when the second end and the third end of the on-off control circuit 400 are disconnected, the circuit where the heating wire RL is located is disconnected. In other words, the second end and the third end of the on-off control circuit 400 and the heating wire RL are connected in series between the arbitrary power source VCC1 and the ground GND. When the second terminal and the third terminal of the on-off control circuit 400 are closed and conducted, the arbitrary power source VCC1 forms a path to the ground GND. At this time, the current flows from the arbitrary power supply VCC1 to the ground GND through the heating wire RL and the second and third ends of the on-off control circuit 400, and the heating wire RL is electrified to generate heat. When the second end and the third end of the on-off control circuit 400 are disconnected, the path from the arbitrary power supply VCC1 to the ground GND is disconnected, and the heating wire is not electrified and does not generate heat. The first end of the on-off control circuit 400 is further connected to the second pin 202, so that the second electrical signal output by the main control circuit 200 can be obtained.
The operation principle of the heat generation control circuit is described in detail below.
In a possible embodiment, the output of the second electrical signal by the main control circuit 200 according to the first electrical signal may specifically be: the main control circuit 200 may determine the second electrical signal by comparing the voltage value of the first electrical signal with a preset voltage threshold, and then output the second electrical signal. In this case, a voltage threshold may be stored within the main control circuit 200.
Specifically, when the voltage value of the first electrical signal is smaller than the voltage threshold, the main control circuit may determine that the second electrical signal is a low level signal, and the low level signal may be used to indicate that the on-off control circuit is turned off; when the voltage value of the first electrical signal is greater than or equal to the voltage threshold, the main control circuit may determine that the second electrical signal is a high level signal, and the high level signal may be used to indicate that the on-off control circuit is turned on.
In this case, the control principle of the heat generation control circuit is as follows: when the heating control circuit 10 in the electric blanket operates, the pressure detection circuit 100 outputs a first electrical signal to the main control circuit 200. The main control circuit 200 compares the voltage value of the first electrical signal with a voltage threshold. When the voltage value of the first electrical signal is greater than or equal to the voltage threshold, the second pin 202 of the main control circuit 200 outputs a high level signal; when the voltage value of the first electrical signal is smaller than the voltage threshold, the second pin 202 of the main control circuit 200 outputs a low level signal. At this time, if the pressure detection circuit 100 receives a pressure, the voltage value of the first electric signal output by the pressure detection circuit 100 is high. When the voltage value of the first electrical signal meets the voltage threshold, the main control circuit 200 outputs a high level signal, and the on-off control circuit controls the second end and the third end of the on-off control circuit 400 to be closed according to the high level signal, so as to control the heating wire RL to be electrified and heated. If the pressure detection circuit 100 is not under pressure, the voltage value of the first electrical signal output by the pressure detection circuit 100 is lower. When the voltage value of the first electrical signal does not satisfy the voltage threshold, the main control circuit 200 outputs a low level signal, and the on-off control circuit controls the second end and the third end of the on-off control circuit 400 to be disconnected according to the low level signal, so as to control the heating wire RL to stop heating when the power is off.
When the heating control circuit 10 in the electric blanket is used for manufacturing the electric blanket, the heating control circuit 10 in the electric blanket can be electrified to work if a person is positioned on the heating control circuit 10 in the electric blanket. On the contrary, if no one is on the heating control circuit 10 in the electric blanket, the heating control circuit 10 in the electric blanket is powered off and is not heated. The heating control circuit 10 in the electric blanket can automatically control whether the heating wires work or not according to the resistance value of the pressure detection device 110, thereby reducing the potential safety hazard.
Alternatively, the main control circuit 200 may also determine the first electrical signal according to other conditions, so as to output a second electrical signal. For example, the main control circuit 200 may output the second electrical signal according to the first electrical signal by: the main control circuit 200 determines the second electrical signal according to whether the first electrical signal is changed, thereby outputting the second electrical signal.
Specifically, when the first electrical signal is an electrical signal with a constantly changing voltage value, the main control circuit may determine that the second electrical signal is a low level signal, and the low level signal may be used to indicate that the on-off control circuit is turned off; when the first electrical signal is an electrical signal with a voltage value which is continuously unchanged, the main control circuit can determine that the second electrical signal is a high-level signal, and the high-level signal can be used for indicating the conduction of the on-off control circuit.
In this case, the control principle of the heat generation control circuit is as follows: when the heating control circuit 10 in the electric blanket operates, the pressure detection circuit 100 outputs a first electrical signal to the main control circuit 200. The main control circuit 200 determines whether the voltage value of the first electrical signal changes and compares the voltage value with the first electrical signal. When the voltage value of the first electrical signal continuously changes, the second pin 202 of the main control circuit 200 outputs a high level signal; when the voltage value of the first electrical signal remains unchanged, the second pin 202 of the main control circuit 200 outputs a low level signal. At this time, when a person is in the heating control circuit 10 in the electric blanket, the resistance value of the pressure detection device 110 changes along with the movement, respiration and heartbeat of the human body, the voltage value of the first electrical signal also changes along with the movement, respiration and heartbeat of the human body, and when the voltage value of the first electrical signal acquired by the first pin 201 of the main control circuit 200 continuously changes, the second pin 202 of the main control circuit 200 outputs a high-level signal to control the second end and the third end of the on-off control circuit 400 to be closed and conducted, thereby controlling the heating wire RL to be electrified and heated. On the contrary, when a person is not in the heating control circuit 10 in the electric blanket, the resistance value of the pressure detection device 110 is not changed, the voltage value of the first electric signal is not changed, and when the voltage value of the first electric signal acquired by the first pin 201 of the main control circuit 200 is not changed, the second pin 202 of the main control circuit 200 outputs a low level signal to control the second end and the third end of the on-off control circuit 400 to be disconnected, so that the heating wire RL is controlled to stop heating when power is off.
When a person lies on the electric blanket, the resistance of the pressure detection device 110 changes with the turning, breathing and heartbeat of the person, so that the voltage value of the first electric signal output by the pressure detection circuit 100 changes continuously. At this time, the main control circuit 200 can control the second end and the third end of the on-off control circuit 400 to be closed and conducted according to the first electric signal with the voltage value changing constantly, so that the heating wire is electrified and heated. On the contrary, when no one lies on the electric blanket, the resistance value of the pressure detection device 110 is not changed, so that the voltage value of the first electric signal is stabilized. At this time, the main control circuit 200 can control the on-off control circuit 400 to be disconnected between the second end and the third end of the on-off control circuit 400 according to the first electric signal of the stable voltage value, and the heating wire stops working. The heating control circuit 10 in the electric blanket can automatically control whether the heating wires work or not according to the resistance value of the pressure detection device 110, thereby reducing the potential safety hazard.
Not limited to above-mentioned condition, confirm that the second signal of telecommunication can also have other judgement conditions according to first signal of telecommunication, the second signal of telecommunication can also have other circumstances, the embodiment of the utility model provides a do not do the restriction. For example, when the second electrical signal is a level signal, a low level signal may be used to indicate that the on-off control circuit is turned off, and a high level signal may be used to indicate that the on-off control circuit is turned on.
In one embodiment, as shown in FIG. 2, the pressure sensing circuit 100 includes a pressure sensing device 110 and a resistor R1 in series; the main control circuit 200 includes a first pin 201 and a second pin 202.
Specifically, the main control circuit 200 includes a first pin 201 and a second pin 202. The first pin 201 is used for inputting an electrical signal; the second pin 202 is used for outputting an electrical signal. The first pin 201 is connected between the pressure detecting device 110 and the resistor R1, thereby acquiring the first electrical signal. The second pin 202 is connected to a first end of the on-off control circuit 400, so as to output a second electrical signal.
More specifically, the pressure detection device 110 is connected between the first pin 201 and the power source VCC. The resistor R1 is connected between the first pin 201 and the ground GND. At this time, the current in the power source VCC reaches the ground GND via the pressure detection device 110 and the resistor R1. The main control circuit 200 can obtain a first electrical signal between the pressure detection device 110 and the resistor R1 through the first pin 201. The main control circuit 200 outputs the second electrical signal from the second pin 202 according to the first electrical signal, thereby controlling the connection or disconnection between the second terminal and the third terminal of the on-off control circuit 400.
Further, the pressure detection device 110 may be a thin film pressure sensor or/and a pressure sensitive resistor.
In one embodiment, as shown in fig. 2, a signal amplifier 120 is further connected between the first pin 201 of the main control circuit 200 and the pressure detection circuit 100. The signal amplifier 120 may specifically be an integrated amplifier based on a transistor (e.g. bipolar transistor, field effect transistor, etc.) amplification circuit, which may specifically be a voltage amplifier.
Specifically, when the main control circuit 200 outputs the second electrical signal according to whether the first electrical signal fluctuates or not, the fluctuation of the first electrical signal may be small. Therefore, a signal amplifier 120 may be connected between the pressure detection circuit 100 and the first pin 201 of the main control circuit 200. At this time, the first electric signal enters the main control circuit 200 through the signal amplifier 120. After the signal amplifier 120 amplifies the first electrical signal, the response sensitivity of the main control circuit 200 to the first electrical signal is improved, so that the sensitivity of the heating control circuit 10 in the electric blanket is improved.
In one embodiment, as shown in FIG. 3, the on-off control circuit 400 includes a switching element 410 and a switch control circuit 420.
Specifically, the switch element 410 is used for controlling the on/off of a circuit where the heating wire RL is located. The switching element 410 is connected in series with the heating wire RL. In other words, the switching element 410 and the heating wire RL are connected in series between the arbitrary power source VCC1 and the ground line GND, thereby controlling whether current flows through the heating wire RL. At this time, the switch element 410 is connected to two ends of the circuit where the heating wire RL is located, which constitute the second end and the third end of the on-off control circuit 400.
One end of the switch control circuit 420 is connected to the switch element 410, thereby controlling the switch element 410 to be turned on or off. The other end of the switch control circuit 420 is further connected to the second pin 202 of the main control circuit 200, so as to obtain the second electrical signal and control the switch element 410 to be turned on or off according to the second electrical signal. At this time, the other end of the switch control circuit 420 constitutes a first end of the on-off control circuit 400.
Further, the switching element 410 may be a thyristor. The thyristor is connected to one end of the switch control circuit 420, and thus is turned on or off under the control of the switch control circuit 420. The thyristor is also called as thyristor, and is a high-power semiconductor device with a four-layer structure of three PN junctions. The controllable silicon is connected with the heating wire RL in series, so that the on-off of a circuit where the heating wire RL is located can be controlled. At this time, two ends of the thyristor are the second end and the third end of the on-off control circuit 400. The second electrical signal may be a level signal to control the thyristor to close or open.
The switch control circuit 420 may include a transistor TR1, a resistor R2, a resistor R3, and a resistor R4.
Specifically, the base of the transistor TR1 is connected to the second pin 202 of the main control circuit 200, so that the second electrical signal can be obtained. The collector of the transistor TR1 is connected to the switching element 410, thereby controlling the switching element 410 to be turned on and off. The emitter of the transistor TR1 is connected to the ground GND. At this time, the base of the transistor TR1 is the first terminal of the on-off control circuit 400.
The resistor R2 is connected between the base and emitter of the transistor TR 1. In other words, one end of the resistor R2 is connected to the base of the transistor TR 1; the other end of the resistor R2 is connected with the emitter of the transistor TR 1.
The resistor R3 is connected between the base of the transistor TR1 and the main control circuit 200. In other words, one end of the resistor R3 is connected to the base of the transistor TR 1; the other end of the resistor R3 is connected to the second pin 202 of the main control circuit 200. Meanwhile, the resistor R3 is also connected in series with the resistor R2. Namely, the resistor R3 is connected to the end of the resistor R2 close to the base of the transistor TR1, near the end of the transistor TR 1.
The resistor R4 is connected between the collector of the transistor TR1 and the switching element 410. In other words, one end of the resistor R4 is connected to the collector of the transistor TR 1. The other end of the resistor R4 is connected to the switching element 410.
In the voltage control circuit, the pressure detection circuit 100 outputs the first electric signal. When the voltage value of the first electrical signal is amplified and meets the preset condition of the main control circuit 200, the second electrical signal output by the second pin of the main control circuit 200 is a high-level signal. At this time, the high level signal is divided by the resistor R2 and the resistor R3 and then reaches the base of the transistor TR 1. The transistor TR1 is conductive to ground. The resistor R4 pulls the gate voltage of the thyristor serving as the switching element 410 low. And after the driving current of the controlled silicon is larger than the conduction current, the controlled silicon is conducted. At this time, the heating wire RL is energized to generate heat.
In one embodiment, the main control circuit 200 may be a single chip microcomputer with model number MC81F 4104.
In a specific embodiment, the heating control circuit 10 in the electric blanket may set a preset program in the main control circuit 200, so that the on-off control circuit 400 in the electric blanket is turned on for a period of time after the power VCC is turned on, and then the on-off control circuit 400 is controlled to be turned on or off according to the first electrical signal. In other words, the main control circuit 200 can be set to provide the electric blanket with a preheating function.
At this time, after the electric blanket is powered on by the power VCC, the second pin 202 of the main control circuit 200 outputs a high level signal. The high level signal is divided by a resistor R3 and a resistor R2 and reaches the base of the transistor TR 1. The transistor TR1 is conductive to ground. The resistor R4 pulls the gate voltage of the thyristor serving as the switching element 410 low. And after the driving current of the controlled silicon is larger than the conduction current, the controlled silicon is conducted. At this time, the heating wire RL is energized to generate heat.
When the period of time is over, that is, the electric blanket is preheated, the second pin 202 outputs a low level signal. At this time, the thyristor is turned off, and the heating wire RL is not electrified and does not generate heat.
The pressure detection device 110 and the resistor R1 constitute a voltage dividing circuit, and sampling of the first electrical signal is performed at the connection of the pressure detection device 110 and the resistor R1. The first electrical signal is amplified by the signal amplifier 120 and enters the main control circuit 200 from the first pin 201 of the main control circuit 200.
The working process of the main control circuit 200 is set as follows: when the first electrical signal acquired by the main control circuit 200 is a constantly changing signal, the main control circuit 200 outputs a high level signal; on the contrary, when the first electrical signal acquired by the main control circuit 200 is an invariant electrical signal, the main control circuit 200 outputs a low level signal.
At this time, when a person is located above the electric blanket, the resistance value of the pressure detection device 110 may change with the movement, respiration, and heartbeat of the person. At this time, the voltage value of the first electrical signal also changes with the movement, respiration and heartbeat of the human body. The second pin 202 of the main control circuit 200 can output a second electrical signal with a high level, thereby controlling the conduction of the thyristor. The heating wire RL is electrified to generate heat.
When the electric blanket is not located above any electric blanket, the voltage value of the first electric signal is unchanged. The second pin 202 of the main control circuit 200 can output a second electrical signal with a low level, thereby controlling the thyristor to be turned off. The heating wire RL does not work.
In other specific embodiments, when the second level signal output by the main control circuit 200 changes from a high level signal to a low level signal, a certain delay time may be set.
The application also provides an electric blanket which comprises the heating control circuit in the electric blanket in any one of the embodiments. The heating control circuit 10 in the electric blanket comprises a pressure detection circuit 100, a main control circuit 200, a heating wire RL for heating the electric blanket and an on-off control circuit 400.
Specifically, the pressure detection circuit includes a pressure detection device for detecting pressure. The resistance value of the pressure detection device changes with the pressure applied to the pressure detection device. The pressure detection circuit is connected with a first pin of the main control circuit. The pressure detection circuit is used for outputting a first electric signal to the main control circuit according to the pressure detected by the pressure detection device. The voltage value of the first electrical signal is related to the resistance value of the pressure detection device.
And a second pin of the main control circuit is connected with the first end of the on-off control circuit. And the second end and the third end of the on-off control circuit are connected to the circuit where the heating wire RL is located. The main control circuit is used for outputting a second electric signal according to the first electric signal. The on-off control circuit is used for controlling the on-off of a circuit where the heating wire RL is located according to the second electric signal so as to control the heating of the heating wire RL.
The electric blanket comprises the heating control circuit 10 in the electric blanket of any one of the embodiments, and whether the heating wires work or not can be automatically controlled according to the resistance value of the pressure detection device 110, so that the potential safety hazard is reduced.
In one embodiment, as shown in fig. 4, the electric blanket further includes an insulating and heat conducting layer 20, and the insulating and heat conducting layer 20 covers the heating wire RL, so that the side of the insulating and heat conducting layer 20 away from the heating wire RL is insulated and heat-conducting. The electric blanket has an insulating and heat conducting layer 20 covering the heating wire RL so that when the electric blanket is folded, short circuit of the heating wire RL is not caused.
In one embodiment, the heating wire RL includes at least one of a cupronickel alloy wire, a manganin alloy wire, a cupronickel alloy wire, and a nichrome wire.
Specifically, the heating wire RL may be a copper-nickel alloy wire, a manganese-copper alloy wire, a zinc-copper alloy wire, or a nickel-chromium alloy wire. Of course, the heating wire RL can also be formed by joining multiple sections of materials to generate different heat at different positions, so as to meet special requirements of users. The material of the heating wire RL can be determined according to actual needs.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A heating control circuit in an electric blanket is characterized by comprising at least one pressure detection circuit (100), a main control circuit (200), a heating wire RL for heating the electric blanket and an on-off control circuit (400):
the pressure detection circuit (100) comprises a pressure detection means (110) for detecting a pressure; the resistance value of the pressure detection device (110) is changed along with the pressure applied to the pressure detection device (110);
the pressure detection circuit (100) is connected with a first pin (201) of the main control circuit (200), the pressure detection circuit (100) is used for outputting a first electric signal to the main control circuit (200) according to the pressure detected by the pressure detection device (110), and the voltage value of the first electric signal is related to the resistance value of the pressure detection device (110);
a second pin (202) of the main control circuit (200) is connected with a first end of the on-off control circuit (400), and a second end and a third end of the on-off control circuit (400) are connected to a circuit where the heating wire RL is located; the main control circuit (200) is used for outputting a second electric signal according to the first electric signal, and the on-off control circuit (400) is used for controlling the on-off of a circuit where the heating wire RL is located by controlling the connection between the second end and the third end of the on-off control circuit (400) according to the second electric signal so as to control the heating of the heating wire RL.
2. The heating control circuit in an electric blanket according to claim 1, wherein the pressure detection circuit (100) comprises a pressure detection device (110) and a resistor R1 connected in series;
the first pin (201) is connected between the pressure detection device (110) and the resistor R1.
3. The heating control circuit in an electric blanket according to claim 2, wherein the pressure detection device (110) comprises a thin film pressure sensor S1.
4. The heating control circuit in an electric blanket according to any one of claims 1 to 3, further comprising a signal amplifier (120), wherein the first pin (201) is connected with the pressure detection circuit (100) through the signal amplifier (120).
5. The heating control circuit in an electric blanket according to claim 1, wherein the on-off control circuit (400) comprises a switching element (410) and a switching control circuit (420);
the switch element (410) is connected in series with the heating wire RL;
one end of the switch control circuit (420) is connected with the switch element (410), and the other end of the switch control circuit (420) is connected with the second pin (202) and used for controlling the on-off of a circuit where the heating wire RL is located by controlling the on-off of the switch element (410) according to the second electric signal so as to control the heating of the heating wire RL.
6. The heating control circuit in an electric blanket according to claim 5, wherein the switching element (410) comprises a thyristor; the controllable silicon is connected with one end of the switch control circuit (420).
7. The heating control circuit in an electric blanket according to claim 5, wherein the switch control circuit (420) comprises:
a transistor TR1, the base of the transistor TR1 being connected to the second pin (202); the collector of the transistor TR1 is connected to the switching element (410); an emitting electrode of the triode TR1 is connected with a ground wire GND;
the resistor R2 is connected between the base electrode and the emitter electrode of the triode TR 1;
a resistor R3 connected between the base of the transistor TR1 and the second pin (202), and connected in series with the resistor R2;
and a resistor R4 connected between the collector of the transistor TR1 and the switching element (410).
8. The heating control circuit in an electric blanket according to claim 1, wherein the main control circuit (200) comprises a single chip microcomputer.
9. An electric blanket, comprising a heating control circuit (10) as claimed in any one of claims 1 to 8, and further comprising an insulating and heat conducting layer (20), wherein the insulating and heat conducting layer (20) covers the heating wire RL, so that the heating wire RL is insulated and heat-conducted from the side of the insulating and heat conducting layer (20) away from the heating wire RL.
10. The electric blanket of claim 9, wherein the heating wire RL comprises at least one of a copper-nickel alloy wire, a manganese-copper alloy wire, a zinc-cupronickel alloy wire, and a nickel-chromium alloy wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920682150.3U CN210840079U (en) | 2019-05-13 | 2019-05-13 | Electric blanket and heating control circuit in electric blanket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920682150.3U CN210840079U (en) | 2019-05-13 | 2019-05-13 | Electric blanket and heating control circuit in electric blanket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210840079U true CN210840079U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920682150.3U Active CN210840079U (en) | 2019-05-13 | 2019-05-13 | Electric blanket and heating control circuit in electric blanket |
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| CN (1) | CN210840079U (en) |
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- 2019-05-13 CN CN201920682150.3U patent/CN210840079U/en active Active
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