Dual-voltage heating element resistance control circuit

Abstract

The utility model discloses a double-voltage heating element resistor control circuit which comprises a first input interface, a second input interface, a single chip microcomputer, a voltage detection module, a heating element resistor, a first control switch module, a second control switch module and a third control switch module. A third connecting end of the heating element resistor is connected with the first input interface; one end of the voltage detection module is connected with the power input interface, and the other end is connected with the single-chip microcomputer. The first end of the first control switch module is connected with the single-chip microcomputer, the second end is connected with the first connecting end of the heating element resistor, and the third end is connected with the first input interface. The first end of the second control switch module is connected with the single-chip microcomputer, the second end is connected with the second connecting end of the heating element resistor, and the third end is connected with the second input interface. The first end of the third control switch module is connected with the single-chip microcomputer, the second end is connected with the first connecting end of the heating element resistor, and the third end is connected with the second input interface. The manufacturing cost is low; the space is saved; and the utilization rate is high.

Description

Technical Field

[0001] This utility model relates to the field of instant heating technology, specifically to a dual-voltage heating element resistance control circuit. Background Technology

[0002] To handle dual voltage inputs, existing heating element resistance control circuits often use two parallel heating resistors, and then control the heating circuits corresponding to the heating resistors to work. This results in high manufacturing costs and wasted space. Furthermore, when one heating resistor is working, the other heating resistor is idle, leading to low utilization of the heating resistors.

[0003] Therefore, existing heating element resistance control circuits suffer from high manufacturing costs, large space requirements, and low utilization of heating resistors. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a dual-voltage heating element resistance control circuit, which effectively reduces manufacturing costs, saves space, and has a high utilization rate of heating resistors.

[0005] To achieve the above objectives, the specific solution of this utility model is as follows:

[0006] A dual-voltage heating element resistance control circuit includes a first input interface, a second input interface, a microcontroller, a voltage detection module, a heating element resistor, a first control switch module, a second control switch module, and a third control switch module;

[0007] The heating element resistor has a first connection terminal, a second connection terminal, and a third connection terminal; the third connection terminal of the heating element resistor is connected to the first input interface;

[0008] One end of the voltage detection module is connected to the power input interface, and the other end is connected to the microcontroller.

[0009] The first terminal of the first control switch module is connected to the microcontroller, the second terminal is connected to the first connection terminal of the heating element resistor, and the third terminal is connected to the first input interface.

[0010] The first end of the second control switch module is connected to the microcontroller, the second end is connected to the second connection end of the heating element resistor, and the third end is connected to the second input interface;

[0011] The first end of the third control switch module is connected to the microcontroller, the second end is connected to the first connection end of the heating element resistor, and the third end is connected to the second input interface.

[0012] Further, the first control switch module includes a first switch controller, a first power device, and a first resistor; the first terminal of the first switch controller is connected to the power supply VCC; the second terminal of the first switch controller is connected to the second terminal of the first power device; the third terminal of the first switch controller is connected to the first connection terminal of the heating element resistor; the fourth terminal of the first switch controller is connected to the first input interface; the first terminal of the first power device is connected to one end of the first resistor; the third terminal of the first power device is grounded; and the other end of the first resistor is connected to a microcontroller.

[0013] Furthermore, in this invention, the first switch control device is a relay.

[0014] Furthermore, in this invention, the first power device is a transistor or a MOSFET.

[0015] In a further embodiment of this invention, the second control switch module includes a second switch controller, a second power device, and a second resistor; the first terminal of the second switch controller is connected to the power supply VCC; the second terminal of the second switch controller is connected to the second terminal of the second power device; the third terminal of the second switch controller is connected to the second input interface; the fourth terminal of the second switch controller is connected to the second connection terminal of the heating element resistor; the first terminal of the second power device is connected to one end of the second resistor; the third terminal of the second power device is grounded; and the other end of the second resistor is connected to the microcontroller.

[0016] Furthermore, in this invention, the second switch control device is a relay.

[0017] Furthermore, in this invention, the second power device is a transistor or a MOSFET.

[0018] Further, the third control switch module includes a third switch controller, a third power device, and a third resistor; the first terminal of the third switch controller is connected to the power supply VCC; the second terminal of the third switch controller is connected to the second terminal of the third power device; the third terminal of the third switch controller is connected to the second input interface; the fourth terminal of the third switch controller is connected to the first connection terminal of the heating element resistor; the first terminal of the third power device is connected to one end of the third resistor; the third terminal of the third power device is grounded; and the other end of the third resistor is connected to a microcontroller.

[0019] Furthermore, in this invention, the third switch control device is a relay.

[0020] Furthermore, in this invention, the third power device is a transistor or a MOSFET.

[0021] The beneficial effects of this utility model are as follows: This utility model detects the voltage value of the input power supply by setting a voltage detection module, and uses a microcontroller to control the on / off state of the first control switch module, the second control switch module, and the third control switch module according to the detected voltage value, thereby enabling different input voltages to share a single heating element resistor and making full use of the heating element resistor, thus eliminating the need to set two heating element resistors, effectively reducing manufacturing costs, saving space, and increasing the utilization rate of the heating resistor. Attached Figure Description

[0022] Figure 1 This is the circuit schematic diagram of this utility model;

[0023] Figure 2 This is a circuit diagram of the present invention when the first control switch module and the second control switch module are turned on and the third control switch module is turned off;

[0024] Figure 3 This is a circuit diagram of the present invention when the third control switch module is turned on and the first and second control switch modules are turned off.

[0025] Figure 4 This is a circuit diagram of the voltage detection module of this utility model, which is an AC detection structure.

[0026] Figure 5 This is a circuit diagram of the voltage detection module of this utility model, which is a DC detection structure.

[0027] Explanation of reference numerals in the attached diagram: 100, microcontroller; 200, voltage detection module; 300, first control switch module; 400, second control switch module; 500, third control switch module. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the present invention.

[0029] like Figures 1 to 5 As shown, the dual-voltage heating element resistance control circuit described in this embodiment includes a first input interface A, a second input interface B, a microcontroller 100, a voltage detection module 200, a heating element resistor RN, a first control switch module 300, a second control switch module 400, and a third control switch module 500.

[0030] Specifically, the first input interface A and the second input interface B are used to connect to the input power supply; the voltage detection module 200 is used to detect the voltage of the input power supply and feed it back to the microcontroller 100; the heating element resistor RN has a first connection terminal, a second connection terminal and a third connection terminal; the third connection terminal of the heating element resistor RN is connected to the first input interface A; one end of the voltage detection module 200 is connected to the power input interface and the other end is connected to the microcontroller 100.

[0031] The first control switch module 300 has its first terminal connected to the microcontroller 100, its second terminal connected to the first connection terminal of the heating element resistor RN, and its third terminal connected to the first input interface A; the second control switch module 400 has its first terminal connected to the microcontroller 100, its second terminal connected to the second connection terminal of the heating element resistor RN, and its third terminal connected to the second input interface B; the third control switch module 500 has its first terminal connected to the microcontroller 100, its second terminal connected to the first connection terminal of the heating element resistor RN, and its third terminal connected to the second input interface B.

[0032] In AC power applications, the input power is AC, and the voltage detection module 200 adopts an AC detection structure; in DC power applications, the input power is DC, and the voltage detection module 200 adopts a DC detection structure; the corresponding voltage detection module 200 can be pre-configured according to the usage scenario requirements.

[0033] When the first input interface A and the second input interface B are connected to an input power supply with a voltage value of the first voltage, the voltage detection module 200 detects the input power supply and feeds back the detection signal to the microcontroller 100. The microcontroller 100 determines that the current input power supply voltage value is the first voltage based on the detection signal, and then controls the first control switch module 300 and the second control switch module 400 to turn on, while the third control switch module 500 turns off. Figure 2 As shown, at this time, the heating element resistance RN is divided into two parts, RN1 and RN2, which are equivalent to two resistors in parallel. The two parts are connected in parallel and then connected in series in the heating circuit to work.

[0034] When the first input interface A and the second input interface B are connected to an input power supply with a voltage value of the second voltage, and the second voltage is greater than the first voltage, similarly, the voltage detection module 200 feeds back the detection signal to the microcontroller 100. The microcontroller 100 determines that the current input power supply voltage value is the second voltage based on the detection signal, and then controls the third control switch module 500 to turn on, while the first control switch module 300 and the second control switch module 400 are turned off. Figure 3 As shown, at this time, the entire heating element resistor RN is connected in series in the heating circuit.

[0035] This embodiment uses a voltage detection module 200 to detect the voltage of the input power supply. The microcontroller 100 controls the on / off state of the first control switch module 300, the second control switch module 400, and the third control switch module 500 based on the detected voltage. This allows different input voltages to share a single heating element resistor RN and makes full use of the heating element resistor RN, eliminating the need for two heating element resistors RN. This effectively reduces manufacturing costs, saves space, and increases the utilization rate of the heating resistor.

[0036] In some embodiments of the dual-voltage heating element resistance control circuit of this example, the second connection terminal is led out from the center of the heating element resistor RN. Thus, when the second voltage is twice the first voltage, the total power when connected to the first voltage is equal to the total power when connected to the second voltage, thereby meeting heating requirements with different input voltages.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the first control switch module 300 includes a first switch controller K1, a first power device Q1, and a first resistor R1; the first terminal of the first switch controller K1 is connected to the power supply VCC; the second terminal of the first switch controller K1 is connected to the second terminal of the first power device Q1; the third terminal of the first switch controller K1 is connected to the first connection terminal of the heating element resistor RN; the fourth terminal of the first switch controller K1 is connected to the first input interface A; the first terminal of the first power device Q1 is connected to one end of the first resistor R1; the third terminal of the first power device Q1 is grounded; and the other end of the first resistor R1 is connected to the microcontroller 100. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the first switch controller K1 is a relay. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the first power device Q1 is a transistor or a MOSFET.

[0038] Specifically, the power supply VCC is the operating voltage of the first switch control device K1. During operation, the microcontroller 100 outputs a drive voltage to the first power device Q1 to control the on / off state of the first power device Q1. When the first power device Q1 is turned on, the first switch control device K1 is turned on, so that the first input interface A is directly connected to the first connection segment of the heating element resistor RN.

[0039] like Figure 1 and Figure 2As shown, in some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the second control switch module 400 includes a second switch controller K2, a second power device Q2, and a second resistor R2; the first terminal of the second switch controller K2 is connected to the power supply VCC; the second terminal of the second switch controller K2 is connected to the second terminal of the second power device Q2; the third terminal of the second switch controller K2 is connected to the second input interface B; the fourth terminal of the second switch controller K2 is connected to the second connection terminal of the heating element resistor RN; the first terminal of the second power device Q2 is connected to one end of the second resistor R2; the third terminal of the second power device Q2 is grounded; and the other end of the second resistor R2 is connected to the microcontroller 100. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the second switch controller K2 is a relay. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the second power device Q2 is a transistor or a MOSFET.

[0040] Specifically, the power supply VCC is the operating voltage of the second switch controller K2. During operation, the microcontroller 100 outputs a drive voltage to the second power device Q2 to control the on / off state of the second power device Q2. When the second power device Q2 is turned on, the second switch controller K2 is turned on, so that the second input interface B is directly connected to the second connection section of the heating element resistor RN.

[0041] like Figure 1 and Figure 3 As shown, in some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the third control switch module 500 includes a third switch controller K3, a third power device Q3, and a third resistor R3; the first terminal of the third switch controller K3 is connected to the power supply VCC; the second terminal of the third switch controller K3 is connected to the second terminal of the third power device Q3; the third terminal of the third switch controller K3 is connected to the second input interface B; the fourth terminal of the third switch controller K3 is connected to the first connection terminal of the heating element resistor RN; the first terminal of the third power device Q3 is connected to one end of the third resistor R3; the third terminal of the third power device Q3 is grounded; and the other end of the third resistor R3 is connected to the microcontroller 100. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the third switch controller K3 is a relay. In some embodiments of the dual-voltage heating element resistance control circuit of this embodiment, the third power device Q3 is a transistor or a MOSFET.

[0042] Specifically, the power supply VCC is the operating voltage of the third switch controller K3. During operation, the microcontroller 100 outputs a drive voltage to the third power device Q3 to control the on / off state of the third power device Q3. When the third power device Q3 is on, the third switch controller K3 is turned on, so that the second input interface B is directly connected to the first connection section of the heating element resistor RN.

[0043] In AC power applications, for example, such as Figure 4 As shown, the voltage detection module 200 includes a third resistor R3R10, a voltage transformer T1, a fourth resistor R11, a first capacitor C11, a fifth resistor R12, a sixth resistor R13, a seventh resistor R14, a diode D11, a diode D12, and a second capacitor C12. One end of the third resistor R3R10 is connected to the first input interface A. The first end of the voltage transformer T1 is connected to the other end of the third resistor R3R10, and the second end of the voltage transformer T1 is connected to the second input interface B. One end of the fourth resistor R11 connected in parallel with the first capacitor C11 is connected to the third end of the voltage transformer T1, and the other end is connected to the fourth end of the voltage transformer T1. Connect the following components: one end of the fifth resistor R12 is connected to the fourth terminal of the voltage transformer T1, and the other end is connected to the power supply VCC; one end of the sixth resistor R13 is connected to the fourth terminal of the voltage transformer T1, and the other end is grounded; one end of the seventh resistor R14 is connected to the third terminal of the voltage transformer T1, and the other end is connected to the ADC port of the microcontroller 100; one end of the second capacitor C12 is connected to the other end of the seventh resistor R14, and the other end is grounded; diodes D11 and D12 are connected in series, and the common node of diodes D11 and D12 is connected to the other end of the seventh resistor R14. The positive terminal of diode D11 is grounded, and the negative terminal of diode D12 is connected to the power supply VCC.

[0044] In DC power applications, for example, such as Figure 5 As shown, the voltage detection module 200 includes an eighth resistor R31, a ninth resistor R32, and a third capacitor C31; one end of the series connection of the eighth resistor R31 and the ninth resistor R32 is connected to the first input interface A, and the other end is connected to the second input interface B and grounded; the common node of the eighth resistor R31 and the ninth resistor R32 is connected to the ADC port of the microcontroller 100; one end of the third capacitor C31 is connected to the common node of the eighth resistor R31 and the ninth resistor R32, and the other end is grounded.

[0045] The above description is only a preferred embodiment of the present utility model. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included within the protection scope of the present utility model patent application.

Claims

1. A dual-voltage heating element resistance control circuit, characterized in that, It includes a first input interface, a second input interface, a microcontroller, a voltage detection module, a heating element resistor, a first control switch module, a second control switch module, and a third control switch module; The heating element resistor has a first connection terminal, a second connection terminal, and a third connection terminal; the third connection terminal of the heating element resistor is connected to the first input interface; One end of the voltage detection module is connected to the power input interface, and the other end is connected to the microcontroller. The first terminal of the first control switch module is connected to the microcontroller, the second terminal is connected to the first connection terminal of the heating element resistor, and the third terminal is connected to the first input interface. The first end of the second control switch module is connected to the microcontroller, the second end is connected to the second connection end of the heating element resistor, and the third end is connected to the second input interface; The first end of the third control switch module is connected to the microcontroller, the second end is connected to the first connection end of the heating element resistor, and the third end is connected to the second input interface.

2. The dual-voltage heating element resistance control circuit according to claim 1, characterized in that, The first control switch module includes a first switch controller, a first power device, and a first resistor; the first terminal of the first switch controller is connected to the power supply VCC; the second terminal of the first switch controller is connected to the second terminal of the first power device; the third terminal of the first switch controller is connected to the first connection terminal of the heating element resistor; the fourth terminal of the first switch controller is connected to the first input interface; the first terminal of the first power device is connected to one end of the first resistor; the third terminal of the first power device is grounded; and the other end of the first resistor is connected to a microcontroller.

3. The dual-voltage heating element resistance control circuit according to claim 2, characterized in that, The first switch control device is a relay.

4. The dual-voltage heating element resistance control circuit according to claim 2, characterized in that, The first power device is a transistor or a MOSFET.

5. The dual-voltage heating element resistance control circuit according to claim 1, characterized in that, The second control switch module includes a second switch controller, a second power device, and a second resistor; the first terminal of the second switch controller is connected to the power supply VCC; the second terminal of the second switch controller is connected to the second terminal of the second power device; the third terminal of the second switch controller is connected to the second input interface; the fourth terminal of the second switch controller is connected to the second connection terminal of the heating element resistor; the first terminal of the second power device is connected to one end of the second resistor; the third terminal of the second power device is grounded; and the other end of the second resistor is connected to the microcontroller.

6. The dual-voltage heating element resistance control circuit according to claim 5, characterized in that, The second switch control device is a relay.

7. The dual-voltage heating element resistance control circuit according to claim 5, characterized in that, The second power device is a transistor or a MOSFET.

8. The dual-voltage heating element resistance control circuit according to claim 1, characterized in that, The third control switch module includes a third switch controller, a third power device, and a third resistor; the first terminal of the third switch controller is connected to the power supply VCC; the second terminal of the third switch controller is connected to the second terminal of the third power device; the third terminal of the third switch controller is connected to the second input interface; the fourth terminal of the third switch controller is connected to the first connection terminal of the heating element resistor; the first terminal of the third power device is connected to one end of the third resistor; the third terminal of the third power device is grounded; and the other end of the third resistor is connected to the microcontroller.

9. A dual-voltage heating element resistance control circuit according to claim 8, characterized in that, The third switch control device is a relay.

10. A dual-voltage heating element resistance control circuit according to claim 8, characterized in that, The third power device is a transistor or a MOSFET.

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