CN116600421A - Control circuit - Google Patents

Control circuit Download PDF

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Publication number
CN116600421A
CN116600421A CN202310269914.7A CN202310269914A CN116600421A CN 116600421 A CN116600421 A CN 116600421A CN 202310269914 A CN202310269914 A CN 202310269914A CN 116600421 A CN116600421 A CN 116600421A
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CN
China
Prior art keywords
resistor
circuit
comparator
control circuit
heating module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310269914.7A
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Chinese (zh)
Inventor
王炳坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiaxing Musi Smart Home Co ltd
Original Assignee
Jiaxing Musi Smart Home Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiaxing Musi Smart Home Co ltd filed Critical Jiaxing Musi Smart Home Co ltd
Priority to CN202310269914.7A priority Critical patent/CN116600421A/en
Publication of CN116600421A publication Critical patent/CN116600421A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • H05B3/0019—Circuit arrangements

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  • Control Of Resistance Heating (AREA)

Abstract

The invention discloses a control circuit. The control circuit includes: the voltage dividing circuit comprises a first resistor and a thermistor which are connected in series, and the first resistor and the thermistor are connected between a first power end and a ground end; the gear selection circuit comprises a plurality of gear units, and the input ends of the gear units are connected with a first power supply end; the first input end of the comparison circuit is connected with the voltage dividing circuit, and the second input end of the comparison circuit is connected with the output end of the gear unit; and the input end of the driving circuit is connected with the output end of the comparison circuit, the output end of the driving circuit is connected with the heating module, and the driving circuit is used for controlling the heating module to be turned on or off according to the output signal of the comparison circuit. In the embodiment of the invention, the heating module is controlled to work through a simple structure, the temperature gear of the heating module is adjustable, and the cost is low.

Description

Control circuit
Technical Field
The invention relates to the technical field of temperature control, in particular to a control circuit.
Background
With the improvement of human living standard, the demand of people for comfort of home is increasing. Particularly, the comfort level of the bed can influence the sleeping of people, and the bad sleeping can seriously influence the work, the study and the life.
In order to improve comfort, users often arrange heating devices such as electric blankets on beds, especially in southern cities. However, the temperature control structure used in the current electric blanket has high cost.
Disclosure of Invention
The invention provides a control circuit to solve the problem of high cost of the existing temperature control structure.
According to an aspect of the present invention, there is provided a control circuit including:
the voltage dividing circuit comprises a first resistor and a thermistor which are connected in series, and the first resistor and the thermistor are connected between a first power end and a ground end;
the gear selection circuit comprises a plurality of gear units, and the input end of each gear unit is connected with the first power supply end;
the first input end of the comparison circuit is connected with the voltage dividing circuit, and the second input end of the comparison circuit is connected with the output end of the gear unit;
the input end of the driving circuit is connected with the output end of the comparison circuit, the output end of the driving circuit is connected with the heating module, and the driving circuit is used for controlling the heating module to be turned on or turned off according to the output signal of the comparison circuit.
Further, the thermistor is a negative temperature coefficient thermistor.
Further, the control circuit is connected with external equipment;
the gear unit comprises a first capacitor, a first switching element and a second resistor, wherein the first capacitor and the first switching element are connected in parallel, the input end of the first switching element is also connected with the first power supply end, the output end of the first switching element is also connected with the second input end of the comparison circuit through the second resistor, and the control end of the first switching element is connected with the external equipment;
the external device is used for controlling the first switching element to be switched on or switched off.
Further, the comparison circuit comprises a comparator, a third resistor, a fourth resistor and a first diode; the gear selection circuit further comprises a fifth resistor;
the inverting input end of the comparator is connected with the voltage dividing circuit through the third resistor, the non-inverting input end of the comparator is connected with the output end of the gear unit through the fourth resistor, the positive power end of the comparator is connected with the first power end, the negative power end of the comparator is connected with the ground end, the output end of the comparator is connected with the negative power end of the comparator through the first diode, the fifth resistor is connected between the output end of the gear unit and the ground end, and the output end of the comparator is also connected with the input end of the driving circuit.
Further, the first diode is a zener diode, an anode of the zener diode is connected with a negative power supply end of the comparator, and a cathode of the zener diode is connected with an output end of the comparator.
Further, the driving circuit comprises a sixth resistor, a seventh resistor, a second capacitor and a first switching device;
the sixth resistor is connected between the output end of the comparison circuit and the control end of the first switching device;
the seventh resistor is connected between the ground terminal and the control terminal of the first switching device;
the second capacitor is connected between the ground terminal and the control terminal of the first switching device;
the first switching device is connected between the ground terminal and the heating module.
Further, the first switching device is an N-type transistor.
Further, the method further comprises the following steps: a temperature protection switch;
the heating module is connected between the output end of the driving circuit and the temperature protection switch.
Further, the method further comprises the following steps: a power switch;
the power switch is connected between the first power end and the temperature protection switch.
Further, the control circuit is connected with external equipment;
the power switch comprises a third capacitor and a second switch element, the third capacitor and the second switch element are connected in parallel, the input end of the second switch element is also connected with the first power end, the output end of the second switch element is also connected with the heating module through the temperature protection switch, and the control end of the second switch element is connected with the external equipment;
the external device is used for controlling the second switching element to be switched on or switched off.
In the embodiment of the invention, the voltage dividing circuit comprises a first resistor and a thermistor which are connected in series, the gear selection circuit comprises a plurality of gear units, the gear units are connected between a first power end and a second input end of the comparison circuit, the first input end of the comparison circuit is connected with the voltage dividing circuit, and the output end of the comparison circuit is connected with the input end of the driving circuit. In the embodiment of the invention, the first input end of the comparison circuit receives the voltage division value provided by the voltage division circuit, the second input end of the comparison circuit receives the gear signal provided by the gear selection circuit, the comparison circuit compares the voltage division value with the gear signal and outputs the comparison result, so that the driving circuit controls the heating module to be turned on or off according to the comparison result, the heating module is controlled to work through a simple structure, the temperature gear of the heating module is adjustable, and the cost is lower.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of yet another control circuit provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of yet another control circuit provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a control circuit according to another embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic diagram of a control circuit according to an embodiment of the present invention. The embodiment is applicable to the case of controlling the heating of the heating module. As shown in fig. 1, the control circuit includes: a voltage dividing circuit 10 including a first resistor R11 and a thermistor R12 connected in series, and the first resistor R11 and the thermistor R12 are connected between a first power supply terminal VCC and a ground terminal GND; the gear selection circuit 11 comprises a plurality of gear units 12, and the input end of each gear unit 12 is connected with a first power supply end VCC; the first input end of the comparison circuit 13 is connected with the voltage dividing circuit 10, and the second input end of the comparison circuit 13 is connected with the output end of the gear unit 12; the input end of the driving circuit 14 is connected with the output end of the comparison circuit 13, the output end of the driving circuit 14 is connected with the heating module 15, and the driving circuit 14 is used for controlling the heating module 15 to be turned on or off according to the output signal of the comparison circuit 13.
In this embodiment, the control circuit includes a voltage dividing circuit 10, the voltage dividing circuit 10 includes a first resistor R11 and a thermistor R12 connected in series, a first end of the thermistor R12 is connected to a first power supply end VCC, a first end of the first resistor R11 is connected to a ground end GND, a second end of the first resistor R11 is connected to a second end of the thermistor R12, and the second end of the thermistor R12 is also used as an output end of the voltage dividing circuit 10 to output a voltage dividing value. The resistance of the thermistor R12 at different temperatures is different, and thus, the voltage at the output end of the voltage dividing circuit 10 is affected by the change of the resistance of the thermistor R12 at different temperatures.
The control circuit includes a gear selection circuit 11, the gear selection circuit 11 includes a plurality of gear units 12, and the gear selection circuit 11 includes three gear units 12 connected in parallel as illustrated in fig. 1, the 3 gear units 12 being labeled S1, S2, S3, respectively, but the number of gear units 12 in the gear selection circuit 11 is not limited thereto. For any one gear unit 12, the input terminal of the gear unit 12 is connected to the first power supply terminal VCC, and the output terminal of the gear unit 12 is connected to the second input terminal of the comparison circuit 13. When the resistance values of the different gear units 12 in the on state are different, and when the different gear units 12 are turned on, the electrical signals transmitted to the second input terminal of the comparison circuit 13 are different, and the second input terminal of the comparison circuit 13 can determine the on gear of the gear selection circuit 11 according to the received electrical signals, so that the electrical signals received by the second input terminal of the comparison circuit 13 can also be defined as gear signals. The change of the resistance of the thermistor R12 at different temperatures affects the voltage at the output end of the voltage dividing circuit 10, and the change of the voltage at the output end of the voltage dividing circuit 10 controls the switching states of different gear switches 12, and the change of the temperature from low to high changes the resistance of the thermistor R12, thereby ensuring that the gear unit 12 is switched from low gear to high gear.
The control circuit is connected to an external device (not shown) connected to the control end of each gear unit 12, and the external device is used for controlling the gear units 12 to be turned on or off. Specifically, when the user operates the external device, the external device adjusts the gear of the control circuit according to the user command; for example, when the external device is operated by the user to switch to S1 gear, the external device controls the gear unit S1 to be turned on according to the user command, and controls the other gear units 12 to be turned off, then the electric signal provided by the first power supply terminal VCC is transmitted to the second input terminal of the comparison circuit 13 through the turned-on gear unit S1, and the second input terminal of the comparison circuit 13 can determine that the turned-on gear of the gear selection circuit 11 is the gear unit S1 according to the received electric signal; or, when the external device is operated by the user to switch to the S3 gear, the external device controls the gear unit S3 to be turned on according to the user command, and controls the other gear units 12 to be turned off, and then the electric signal provided by the first power supply terminal VCC is transmitted to the second input terminal of the comparison circuit 13 through the turned-on gear unit S3, and the second input terminal of the comparison circuit 13 can determine that the turned-on gear of the gear selection circuit 11 is the gear unit S3 according to the received electric signal.
The control circuit comprises a comparison circuit 13. A first input terminal of the comparison circuit 13 is connected to an output terminal of the voltage dividing circuit 10, and specifically, a first input terminal of the comparison circuit 13 is connected to a second terminal of the thermistor R12. A second input terminal of the comparison circuit 13 is connected to an output terminal of each gear unit 12, and an output terminal of the comparison circuit 13 is connected to an input terminal of the driving circuit 14.
Specifically, the change of the resistance of the thermistor R12 at different temperatures affects the voltage level at the output end of the voltage dividing circuit 10, and the divided voltage value of the voltage dividing circuit 10 is input to the first input end of the comparison circuit 13, so that the electrical signal received by the first input end of the comparison circuit 13 is related to the current temperature of the thermistor R12. The resistance values of the different gear units 12 in the on state are different, the external device controls one gear unit 12 to be turned on according to a user command, and controls other gear units 12 to be turned off, and for example, the external device is operated by a user to switch to the S3 gear, and then an electric signal provided by the first power supply terminal VCC is transmitted to the second input terminal of the comparison circuit 13 through the turned-on gear unit S3. The comparison circuit 13 compares the electric signal received at the first input terminal with the electric signal received at the second input terminal, and outputs a comparison result, which may be a high voltage or a low voltage, to the driving circuit 14.
The control circuit comprises a driving circuit 14, wherein the input end of the driving circuit 14 is connected with the output end of the comparison circuit 13, and the output end of the driving circuit 14 is connected with the heating module 15. The driving circuit 14 receives the comparison result output by the comparison circuit 13, and controls the heating module 15 to be turned on or off according to the output signal of the comparison circuit 13. For example, the comparison result output by the comparison circuit 13 is a high voltage signal, and the driving circuit 14 controls the transmission path of the heating module 15 to be conducted according to the high voltage signal, so that the heating module 15 is turned on and heats; the comparison result output by the comparison circuit 13 is a low voltage signal, and the driving circuit 14 controls the transmission path of the heating module 15 to be turned off according to the low voltage signal, so that the heating module 15 is turned off, and the heating module 15 does not heat. In other embodiments, the comparison result output by the optional comparison circuit is a high voltage signal, and the driving circuit controls the transmission path of the heating module to be turned off according to the high voltage signal; the comparison result output by the comparison circuit is a low-voltage signal, and the driving circuit controls the conduction of the transmission path of the heating module according to the low-voltage signal.
The selectable thermistor is a negative temperature coefficient thermistor. The resistance value of the negative temperature coefficient NTC thermistor is reduced along with the rise of temperature, and the temperature measuring, temperature compensating and controlling component can be manufactured by utilizing the characteristic, and has high sensitivity and low cost. In this embodiment, the NTC thermistor is disposed near the heating module as a temperature sensor, or the NTC thermistor is attached to the surface of the heating module as a temperature sensor, where the NTC thermistor is used to detect the temperature of the heating module, and the control circuit controls the temperature of the heating module according to the temperature parameter of the heating module fed back by the NTC thermistor, so as to realize accurate control and adjustment of the temperature of the heating module. But is not limited thereto, in other embodiments the thermistor may alternatively be a positive temperature coefficient thermistor.
In the embodiment of the invention, the voltage dividing circuit comprises a first resistor and a thermistor which are connected in series, the gear selection circuit comprises a plurality of gear units, the gear units are connected between a first power end and a second input end of the comparison circuit, the first input end of the comparison circuit is connected with the voltage dividing circuit, and the output end of the comparison circuit is connected with the input end of the driving circuit. In the embodiment of the invention, the first input end of the comparison circuit receives the voltage division value provided by the voltage division circuit, the second input end of the comparison circuit receives the gear signal provided by the gear selection circuit, the comparison circuit compares the voltage division value with the gear signal and outputs the comparison result, so that the driving circuit controls the heating module to be turned on or off according to the comparison result, the heating module is controlled to work through a simple structure, the temperature gear of the heating module is adjustable, and the cost is lower.
The optional control circuit is connected with external equipment; the gear unit comprises a first capacitor, a first switching element and a second resistor, the first capacitor is connected with the first switching element in parallel, the input end of the first switching element is also connected with a first power supply end, the output end of the first switching element is also connected with the second input end of the comparison circuit through the second resistor, and the control end of the first switching element is connected with external equipment; the external device is used for controlling the first switching element to be turned on or turned off.
Fig. 2 is a schematic diagram of another control circuit according to an embodiment of the present invention. As shown in fig. 2, the optional control circuit is connected to an external device (not shown); the gear unit S1 comprises a first capacitor C11, a first switching element S11 and a second resistor R21, wherein a first end of the first capacitor C11 is connected with an input end of the first switching element S11, a second end of the first capacitor C11 is connected with an output end of the first switching element S11, the input end of the first switching element S11 is also connected with a first power supply end VCC, the output end of the first switching element S11 is also connected with a second input end of the comparison circuit 13 through the second resistor R21, and a control end of the first switching element S11 is connected with external equipment; the external device is used for controlling the first switching element S11 to be turned on or turned off.
The gear unit S2 comprises a first capacitor C12, a first switching element S12 and a second resistor R22, wherein a first end of the first capacitor C12 is connected with an input end of the first switching element S12, a second end of the first capacitor C12 is connected with an output end of the first switching element S12, the input end of the first switching element S12 is also connected with a first power supply end VCC, the output end of the first switching element S12 is also connected with a second input end of the comparison circuit 13 through the second resistor R22, and a control end of the first switching element S12 is connected with external equipment; the external device is used for controlling the first switching element S12 to be turned on or turned off.
The gear unit S3 comprises a first capacitor C13, a first switching element S13 and a second resistor R23, wherein a first end of the first capacitor C13 is connected with an input end of the first switching element S13, a second end of the first capacitor C13 is connected with an output end of the first switching element S13, the input end of the first switching element S13 is also connected with a first power supply end VCC, the output end of the first switching element S13 is also connected with a second input end of the comparison circuit 13 through the second resistor R23, and a control end of the first switching element S13 is connected with external equipment; the external device is used for controlling the first switching element S13 to be turned on or turned off.
In this embodiment, the first capacitor in the gear unit may play a role in filtering, so as to further improve control accuracy of the control circuit. In other embodiments, the first capacitor may be omitted from the gear unit, which may reduce the cost.
Fig. 3 is a schematic diagram of a control circuit according to another embodiment of the present invention. As shown in fig. 3, the optional comparison circuit 13 includes a comparator U1, a third resistor R3, a fourth resistor R4, and a first diode D1; the gear selection circuit 11 further includes a fifth resistor R5; the inverting input terminal (-) of the comparator U1 is connected with the voltage dividing circuit 10 through the third resistor R3, the non-inverting input terminal (+) of the comparator U1 is connected with the output terminal of the gear unit 12 through the fourth resistor R4, the positive power supply terminal P1 of the comparator U1 is connected with the first power supply terminal VCC, the negative power supply terminal P2 of the comparator U1 is connected with the ground terminal GND, the output terminal of the comparator U1 is connected with the negative power supply terminal P2 of the comparator U1 through the first diode D1, the fifth resistor R5 is connected between the output terminal of the gear unit 12 and the ground terminal GND, and the output terminal of the comparator U1 is also connected with the input terminal of the driving circuit 14. The first diode D1 is a zener diode, the positive pole of the zener diode D1 is connected to the negative power supply end P2 of the comparator U1, and the negative pole of the zener diode D1 is connected to the output end of the comparator U1.
In this embodiment, the first end of the third resistor R3 is connected to the second end of the thermistor R12, and the second end of the third resistor R3 is connected to the inverting input terminal (-) of the comparator U1.
The first end of the fourth resistor R4 is connected to the output end of each gear unit 12, the second end of the fourth resistor R4 is connected to the non-inverting input end (+) of the comparator U1, the first end of the specific fourth resistor R4 is connected to the second resistor R21 of the gear unit S1, the first end of the fourth resistor R4 is further connected to the second resistor R22 of the gear unit S2, and the first end of the fourth resistor R4 is further connected to the second resistor R23 of the gear unit S3.
The first end of the fifth resistor R5 is connected to the output end of each gear unit 12, the second end of the fifth resistor R5 is connected to the ground GND, the first end of the fifth resistor R5 is specifically connected to the second resistor R21 of the gear unit S1, the first end of the fifth resistor R5 is further connected to the second resistor R22 of the gear unit S2, and the first end of the fifth resistor R5 is further connected to the second resistor R23 of the gear unit S3. The fifth resistor R5 plays a voltage dividing role in the shift selection circuit 11.
The first diode D1 is a zener diode. The positive pole of the zener diode D1 is connected with the negative power supply end P2 of the comparator U1, and the negative pole of the zener diode D1 is connected with the output end of the comparator U1. The first diode D1 can ensure a smooth output signal level of the comparator U1 in the comparison circuit 13.
The positive power terminal P1 of the comparator U1 is connected to the first power terminal VCC, the negative power terminal P2 of the comparator U1 is connected to the ground terminal GND, and the output terminal of the comparator U1 is also connected to the input terminal of the driving circuit 14.
Fig. 4 is a schematic diagram of a further control circuit according to an embodiment of the present invention. As shown in fig. 4, the optional driving circuit 14 includes a sixth resistor R6, a seventh resistor R7, a second capacitor C2, and a first switching device Q1; the sixth resistor R6 is connected between the output terminal of the comparison circuit 13 and the control terminal of the first switching device Q1; the seventh resistor R7 is connected between the ground GND and the control terminal of the first switching device Q1; the second capacitor C2 is connected between the ground GND and the control terminal of the first switching device Q1; the first switching device Q1 is connected between the ground GND and the heating module 15. The first switching device Q1 is optionally an N-type transistor.
In this embodiment, a first end of the sixth resistor R6 is connected to the output end of the comparator U1, and a second end of the sixth resistor R6 is connected to the control end of the first switching device Q1. The first end of the seventh resistor R7 is connected to the ground GND, and the second end of the seventh resistor R7 is connected to the control end of the first switching device Q1. The first end of the second capacitor C2 is connected to the ground GND, and the second end of the second capacitor C2 is connected to the control end of the first switching device Q1. The first end of the first switching device Q1 is connected to the ground GND, and the second end of the first switching device Q1 is connected to the heating module 15.
The first switching device Q1 is optionally an N-type transistor. If the electrical signal output by the comparator U1 is a high voltage, the high voltage signal is transmitted to the control end of the first switching device Q1 through the sixth resistor R6, so that the first switching device Q1 is turned on, and the power-on path of the heating module 15 is turned on, so that the heating module 15 is heated. If the electric signal output by the comparator U1 is low voltage, the low voltage signal is transmitted to the control end of the first switching device Q1 through the sixth resistor R6, so that the first switching device Q1 is turned off, and the power-on path of the heating module 15 is turned off, so that the heating module 15 does not heat.
In other embodiments, the first switching device may also be a P-type transistor, or the first switching device may be another type of switching device, such as a transistor, for example.
In this embodiment, the second capacitor C2 in the driving circuit 14 may play a role of filtering, so as to further improve the control accuracy of the control circuit. In other embodiments, the second capacitor in the driving circuit may be omitted, which may reduce the cost.
Fig. 5 is a schematic diagram of a control circuit according to another embodiment of the present invention. As shown in fig. 5, the optional control circuit further includes: a temperature protection switch 16; the heating module 15 is connected between the output of the drive circuit 14 and the temperature protection switch 16. The optional control circuit further comprises: a power switch 17; the power switch 17 is connected between the first power terminal VCC and the temperature protection switch 16. The optional control circuit is connected with external equipment; the power switch 17 comprises a third capacitor C3 and a second switching element S4, the third capacitor C3 and the second switching element S4 are connected in parallel, the input end of the second switching element S4 is also connected with a first power end VCC, the output end of the second switching element S4 is also connected with the heating module 15 through the temperature protection switch 16, and the control end of the second switching element S4 is connected with external equipment; the external device is used for controlling the second switching element S4 to be turned on or turned off.
In this embodiment, the input terminal of the second switching element S4 is connected to the first power supply terminal VCC, and the output terminal of the second switching element S4 is connected to the temperature protection switch 16. The third capacitor C3 is connected in parallel with the second switching element S4, a first end of the third capacitor C3 is connected to an input end of the second switching element S4, and a second end of the third capacitor C3 is connected to an output end of the second switching element S4.
The first end of the temperature protection switch 16 is connected to the output end of the second switching element S4, and the second end of the temperature protection switch 16 is connected to the heating module 15. Normally, the temperature protection switch 16 remains on.
The control end of the second switching element S4 is connected to an external device. The external device is used for controlling the second switching element S4 to be turned on or turned off. Specifically, when the user operates the external device, the external device controls the second switching element S4 to be turned on or off according to a user command.
If the external device controls the second switching element S4 to be turned on according to the user command, the electrical signal provided by the first power supply terminal VCC is transmitted to the heating module 15 through the second switching element S4 and the turned-on temperature protection switch 16, and if the first switching device Q1 is turned on, the first power supply terminal VCC is connected through the transmission path from the heating module 15 to the ground GND, and the heating module 15 is heated. If the external device controls the second switching element S4 to be turned off according to the user command, the electrical signal provided by the first power supply terminal VCC is not transmitted to the heating module 15, and the control circuit is in an off state.
It should be noted that, if the temperature of the heating module 15 of the control circuit is higher than the safety temperature, the temperature protection switch 16 may be turned off, and at this time, the transmission path from the first power supply terminal VCC to the ground terminal GND through the heating module 15 is turned off, and the heating module 15 is not heated any more, so as to realize high temperature protection.
In this embodiment, the third capacitor C3 in the power switch 17 may play a role of filtering, so as to further improve the control accuracy of the control circuit. In other embodiments, the third capacitor in the power switch may be omitted, which may reduce the cost.
The voltage signal provided by the optional first power supply terminal VCC is 24V, the resistance of the first resistor R11 is 100kΩ, and the resistance of the thermistor R12 is 100kΩ. The capacitance value of the first capacitor C11 is 100nF, and the resistance value of the second resistor R21 is 75kΩ. The capacitance value of the first capacitor C12 is 100nF, and the resistance value of the second resistor R22 is 107kΩ. The capacitance value of the first capacitor C13 is 100nF, and the resistance value of the second resistor R23 is 158kΩ. The resistance of the third resistor R3 is 1kΩ, the resistance of the fourth resistor R4 is 1kΩ, and the resistance of the fifth resistor R5 is 10kΩ. The resistance of the sixth resistor R6 is 5kΩ, the resistance of the seventh resistor R7 is 100kΩ, and the capacitance of the second capacitor C2 is 10pF. The capacitance value of the third capacitor C3 is 100nF. It will be appreciated by those skilled in the art that the above parameters are merely exemplary, and that the output accuracy of the subsequent comparator may be adjusted by adjusting the resistance of the second resistor in the gear unit according to the electrical parameters of the components such as the resistor, the capacitor, etc. that are reasonably designed as required by the product.
In this embodiment, the second switching element S4 of the control circuit is a power switch of the heating module, the voltage dividing circuit 10 includes an NTC temperature sensor R12, and the NTC temperature sensor has an inverse relationship with temperature, that is, the resistance of the temperature rising R12 decreases, and the resistance of the temperature falling R12 increases. Based on this, the voltage received at the positive input, i.e. the non-inverting input, of the comparator U1 will vary according to the ambient temperature.
The working process of the control circuit is that the second switching element S4 is conducted; the NTC temperature sensor has different resistance values at different temperatures, the inverting input end Uin of the comparator U1 receives the partial pressure value transmitted by the partial pressure circuit 10, and the non-inverting input end Uin+ of the comparator U1, namely the positive input end, receives the gear signal transmitted by the gear unit 12; if the electrical signal of the non-inverting input terminal uin+ of the comparator U1 is greater than the electrical signal of the inverting input terminal Uin-of the comparator U1, the comparator U1 outputs a high level, the first switching device Q1 is turned on, and the heating module 15 works; as the temperature increases, the resistance of the thermistor R12 decreases, the electrical signal of the inverting input terminal Uin-of the comparator U1 gradually increases, and when the electrical signal of the non-inverting input terminal uin+ of the comparator U1 is smaller than the electrical signal of the inverting input terminal Uin-of the comparator U1, the comparator U1 outputs a low level, the first switching device Q1 is turned off, the heating module 15 stops working, and the temperature of the heating module 15 reaches the set gear. Therefore, the heating module works in an analog signal control mode, the temperature gear is adjustable, the control circuit of the heating module is realized without using high-cost components such as a singlechip and a clock, hardware, embedded human resources and the like, and the cost is reduced.
In this embodiment, the partial pressure values of different resistance values of the NTC temperature sensor at different temperatures are collected to compare with the preset gear signal. When the real-time temperature of the NTC temperature sensor does not reach the set gear, the comparator U1 outputs a high level, the first switching device Q1 is conducted, and the heating module 15 keeps working; and when the real-time temperature of the NTC temperature sensor reaches the set gear, the comparator U1 outputs a low level, the first switching device Q1 is turned off, and the heating module 15 stops operating. In this embodiment, the number of heating gears is not limited, and the temperature control of multiple gears can be realized only by setting the interval of the voltage division of the second resistor in the gear unit. The control circuit may be used in various heating devices, such as electric blankets and the like.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A control circuit, comprising:
the voltage dividing circuit comprises a first resistor and a thermistor which are connected in series, and the first resistor and the thermistor are connected between a first power end and a ground end;
the gear selection circuit comprises a plurality of gear units, and the input end of each gear unit is connected with the first power supply end;
the first input end of the comparison circuit is connected with the voltage dividing circuit, and the second input end of the comparison circuit is connected with the output end of the gear unit;
the input end of the driving circuit is connected with the output end of the comparison circuit, the output end of the driving circuit is connected with the heating module, and the driving circuit is used for controlling the heating module to be turned on or turned off according to the output signal of the comparison circuit.
2. The control circuit of claim 1, wherein the thermistor is a negative temperature coefficient thermistor.
3. The control circuit of claim 1, wherein the control circuit is connected to an external device;
the gear unit comprises a first capacitor, a first switching element and a second resistor, wherein the first capacitor and the first switching element are connected in parallel, the input end of the first switching element is also connected with the first power supply end, the output end of the first switching element is also connected with the second input end of the comparison circuit through the second resistor, and the control end of the first switching element is connected with the external equipment;
the external device is used for controlling the first switching element to be switched on or switched off.
4. The control circuit of claim 1, wherein the comparison circuit comprises a comparator, a third resistor, a fourth resistor, and a first diode; the gear selection circuit further comprises a fifth resistor;
the inverting input end of the comparator is connected with the voltage dividing circuit through the third resistor, the non-inverting input end of the comparator is connected with the output end of the gear unit through the fourth resistor, the positive power end of the comparator is connected with the first power end, the negative power end of the comparator is connected with the ground end, the output end of the comparator is connected with the negative power end of the comparator through the first diode, the fifth resistor is connected between the output end of the gear unit and the ground end, and the output end of the comparator is also connected with the input end of the driving circuit.
5. The control circuit of claim 4, wherein the first diode is a zener diode, the positive electrode of the zener diode is connected to the negative power supply terminal of the comparator, and the negative electrode of the zener diode is connected to the output terminal of the comparator.
6. The control circuit of claim 1, wherein the drive circuit comprises a sixth resistor, a seventh resistor, a second capacitor, and a first switching device;
the sixth resistor is connected between the output end of the comparison circuit and the control end of the first switching device; the seventh resistor is connected between the ground terminal and the control terminal of the first switching device; the second capacitor is connected between the ground terminal and the control terminal of the first switching device; the first switching device is connected between the ground terminal and the heating module.
7. The control circuit of claim 6, wherein the first switching device is an N-type transistor.
8. The control circuit of claim 1, further comprising: a temperature protection switch; the heating module is connected between the output end of the driving circuit and the temperature protection switch.
9. The control circuit of claim 8, further comprising: a power switch; the power switch is connected between the first power end and the temperature protection switch.
10. The control circuit of claim 9, wherein the control circuit is connected to an external device;
the power switch comprises a third capacitor and a second switch element, the third capacitor and the second switch element are connected in parallel, the input end of the second switch element is also connected with the first power end, the output end of the second switch element is also connected with the heating module through the temperature protection switch, and the control end of the second switch element is connected with the external equipment;
the external device is used for controlling the second switching element to be switched on or switched off.
CN202310269914.7A 2023-03-16 2023-03-16 Control circuit Pending CN116600421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310269914.7A CN116600421A (en) 2023-03-16 2023-03-16 Control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310269914.7A CN116600421A (en) 2023-03-16 2023-03-16 Control circuit

Publications (1)

Publication Number Publication Date
CN116600421A true CN116600421A (en) 2023-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310269914.7A Pending CN116600421A (en) 2023-03-16 2023-03-16 Control circuit

Country Status (1)

Country Link
CN (1) CN116600421A (en)

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