A control circuit for electromagnetic stove input voltage adaptive regulation power

Abstract

The utility model discloses a kind of control circuit of induction cooker input voltage self-adapting regulation power, including the power input circuit for being connected with external commercial power and converting alternating current into direct current power supply, power input circuit direct current power supply end is connected with the load LC switching circuit for adjusting heating coil disc working power, power input circuit is connected with the voltage detection circuit for detecting external input commercial power voltage, voltage detection circuit is connected with the control circuit for adjusting the capacitance value in load LC switching circuit according to external input commercial power voltage, thereby adjusting heating coil disc working power, realize the function of induction cooker input voltage self-adapting regulation working power, without external converter, also avoid the burning machine risk caused by manual switching error.

Description

[Technical Field]

[0001] This utility model relates to the field of induction cookers, and in particular to a control circuit for adaptively adjusting the power of an induction cooker based on its input voltage. [Background Technology]

[0002] Among existing induction cookers, some only support a single voltage of 110V or 220V, requiring an additional converter when used in different regions; others are dual-voltage induction cookers, requiring manual switching of the operating voltage, but this is prone to misoperation, such as connecting a 220V induction cooker to 110V, which may result in insufficient power, or connecting a 110V induction cooker to 220V, which may cause the induction cooker to burn out. Furthermore, induction cookers with fixed power designs cannot adapt to the optimal energy efficiency under different voltages. [Utility Model Content]

[0003] This invention overcomes the shortcomings of the prior art and provides a control circuit for adaptively adjusting the power of an induction cooker based on its input voltage.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A control circuit for adaptively adjusting the power of an induction cooker based on its input voltage is characterized by comprising: a power input circuit for connecting to an external mains power supply and converting AC power to DC power; a load LC switching circuit for adjusting the working power of the heating coil connected to the DC power supply terminal of the power input circuit; a voltage detection circuit for detecting the external input mains voltage connected to the power input circuit; and a control circuit for adjusting the capacitance value in the load LC switching circuit according to the external input mains voltage, thereby adjusting the working power of the heating coil.

[0006] The control circuit for adaptive power adjustment of an induction cooker input voltage, as described above, is characterized in that: the load LC switching circuit includes a filter choke L1, capacitors C1, C2, and C3, a relay K1, and a transistor IGBT. One end of the filter choke L1 is connected to the positive terminal of the DC power supply of the power input circuit, and the other end of the filter choke L1 is connected to one end of capacitor C3, one end of the heating coil, one end of capacitor C1, and one end of the controlled switch of relay K1. The other end of capacitor C3 is connected to the negative terminal of the DC power supply of the power input circuit. The other end of capacitor C1 is connected to the other end of the heating coil, one end of capacitor C2, and the collector of transistor IGBT. The other end of capacitor C2 is connected to the other end of the controlled switch of relay K1. The gate of transistor IGBT is connected to the control circuit, and the emitter of transistor IGBT is grounded. One end of relay K1 is connected to the power supply VDD, and the other end of relay K1 is connected to the control circuit.

[0007] The control circuit for adaptive power adjustment of an induction cooker input voltage, as described above, is characterized in that: the voltage detection circuit includes diode D1, diode D2, resistor R8, resistor R9, and electrolytic capacitor C14; the positive terminal of diode D1 is connected to the neutral input terminal of the power input circuit; diode D2 is connected to the neutral input terminal of the power input circuit; the negative terminal of diode D1 is connected to the negative terminal of diode D2 and one end of resistor R8; the other end of resistor R8 is connected to one end of resistor R9, the positive terminal of electrolytic capacitor C14, and the control circuit; and the other end of resistor R9 and the negative terminal of electrolytic capacitor C14 are grounded.

[0008] The control circuit for adaptive power adjustment of input voltage in an induction cooker, as described above, is characterized in that: the control circuit includes a control chip U1, a resistor R7 and a transistor Q2. The control chip U1 is connected to a voltage detection circuit, a load LC switching circuit, and one end of the resistor R7. The other end of the resistor R7 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the load LC switching circuit, and the emitter of the transistor Q2 is grounded.

[0009] The control circuit for adaptive power adjustment of input voltage in an induction cooker, as described above, is characterized in that: the power input circuit includes a live wire connection terminal CNL connected to the mains live wire, a neutral wire connection terminal CNN connected to the mains neutral wire, a capacitor C1, and a rectifier BG1. The live wire connection terminal CNL is connected to pin 1 of the rectifier BG1 and one end of the capacitor C1. The live wire connection terminal CNN is connected to the voltage detection circuit, the other end of the capacitor C1, and pin 2 of the rectifier BG1. Pin 3 of the rectifier BG1 is the DC positive output terminal connected to the filter circuit, and pin 4 of the rectifier BG1 is the DC negative output terminal grounded.

[0010] The control circuit for adaptive power adjustment of input voltage of an induction cooker, as described above, is characterized in that: the live wire connection terminal CNL is connected to one end of the fuse FU1, and the other end of the fuse FU1 is connected to one end of the capacitor C1 and pin 1 of the rectifier BG1.

[0011] The beneficial effects of this utility model are:

[0012] This invention features a load LC switching circuit. The control circuit adjusts the capacitance value in the load LC switching circuit based on the external input AC voltage detected by the voltage detection circuit, thereby adjusting the working power of the heating coil. This enables the induction cooker to adaptively adjust its working power based on the input voltage, eliminating the need for an external converter and avoiding the risk of burn-out due to manual switching errors. [Image Description]

[0013] Figure 1 This is the circuit diagram of this utility model. [Detailed Implementation]

[0014] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0015] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0016] like Figure 1 As shown, a control circuit for adaptive power adjustment of an induction cooker based on input voltage includes a power input circuit 1 for connecting to external mains power and converting AC power to DC power. The DC power supply terminal of the power input circuit 1 is connected to a load LC switching circuit 3 for adjusting the working power of the heating coil 2. The power input circuit 1 is also connected to a voltage detection circuit 4 for detecting the external input mains voltage. The voltage detection circuit 4 is connected to a control circuit 5 for adjusting the capacitance value in the load LC switching circuit 3 according to the external input mains voltage, thereby adjusting the working power of the heating coil 2. During operation, the power input circuit 1 rectifies and converts the external mains power into DC power to supply power to the load LC switching circuit 3. Simultaneously, the voltage detection circuit 4 detects the external mains voltage value and sends it to the control circuit 5. The control circuit 5 adjusts the capacitance value in the load LC switching circuit 3 according to the detected mains voltage value, thereby adjusting the working power of the heating coil 2, realizing the function of adaptive power adjustment based on input voltage, allowing the induction cooker to automatically adjust its working power according to different input voltages.

[0017] In this case, the external input mains voltage threshold for the capacitor value in the load LC switching circuit 3 is adjusted by the control circuit 5 to 150V±2V; the LC switching circuit 3 controls the output power range of the heating coil 2 in low voltage mode to 1200W±10% and in high voltage mode to 2000W±10%. In practical applications, the external input mains voltage for the capacitor value in the load LC switching circuit 3 is generally set to 150V by the control circuit 5.

[0018] like Figure 1As shown, after the power input circuit 1 is connected to the external mains power, the voltage detection circuit 4 detects the external mains voltage. When the voltage detection circuit 4 detects that the external input mains voltage is less than 150V, the control chip U1 in the control circuit 5 controls the transistor Q2 to conduct, energizing the relay K1 in the load LC switching circuit 3, causing the relay K1 to close. At this time, capacitors C1 and C2 and the heating coil 2 form an LC resonant circuit, and the heating coil 2 is in low voltage mode and outputs 1200W of power. When the voltage detection circuit 4 detects that the external input mains voltage is greater than 150V, the control chip U1 in the control circuit 5 controls the transistor Q2 to de-conduct, the relay K1 is not energized, and the relay K1 is opened. At this time, capacitor C1 and the heating coil 2 form an LC resonant circuit, and the heating coil 2 is in high voltage mode and outputs 2000W of power.

[0019] like Figure 1 As shown, a fuse FU1 is installed on the live wire of the power input circuit 1 to provide protection in case of overload or short circuit; the filter choke L1 and capacitor C3 in the load LC switching circuit 3 are used to filter interference signals; the diodes D1 and D2 connected in parallel in the voltage detection circuit 4 are used to improve the accuracy of detecting the external mains voltage; the control chip in the control circuit 5 is model U1AiP8M104H.

[0020] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A control circuit for adaptively adjusting the power of an induction cooker based on its input voltage, characterized in that: It includes a power input circuit (1) for connecting to external mains power and converting AC power to DC power, a load LC switching circuit (3) for adjusting the working power of the heating coil (2) connected to the DC power supply terminal of the power input circuit (1), a voltage detection circuit (4) for detecting the external input mains voltage connected to the power input circuit (1), and a control circuit (5) for adjusting the capacitance value in the load LC switching circuit (3) according to the external input mains voltage to adjust the working power of the heating coil (2).

2. The control circuit for adaptive power adjustment of induction cooker input voltage according to claim 1, characterized in that: The load LC switching circuit (3) includes a filter choke L1, capacitors C1, C2, and C3, a relay K1, and a transistor ICBT. One end of the filter choke L1 is connected to the positive terminal of the DC power supply of the power input circuit (1). The other end of the filter choke L1 is connected to one end of capacitor C3, one end of heating coil (2), one end of capacitor C1, and one end of the controlled switch of relay K1. The other end of capacitor C3 is connected to the negative terminal of the DC power supply of the power input circuit (1). The other end of capacitor C1 is connected to the other end of heating coil (2), one end of capacitor C2, and the collector of transistor IGBT. The other end of capacitor C2 is connected to the other end of the controlled switch of relay K1. The gate of transistor IGBT is connected to the control circuit (5). The emitter of transistor IGBT is grounded. One end of relay K1 is connected to the power supply VDD. The other end of relay K1 is connected to the control circuit (5).

3. The control circuit for adaptive power adjustment of induction cooker input voltage according to claim 1, characterized in that: The voltage detection circuit (4) includes diode D1, diode D2, resistor R8, resistor R9 and electrolytic capacitor C14. The positive terminal of diode D1 is connected to the neutral input terminal of the power input circuit (1), and diode D2 is connected to the neutral input terminal of the power input circuit (1). The negative terminal of diode D1 is connected to the negative terminal of diode D2 and one end of resistor R8. The other end of resistor R8 is connected to one end of resistor R9, the positive terminal of electrolytic capacitor C14 and control circuit (5). The other end of resistor R9 and the negative terminal of electrolytic capacitor C14 are grounded.

4. The control circuit for adaptive power adjustment of induction cooker input voltage according to claim 1, characterized in that: The control circuit (5) includes a control chip U1, a resistor R7 and a transistor Q2. The control chip U1 is connected to the voltage detection circuit (4), the load LC switching circuit (3) and one end of the resistor R7. The other end of the resistor R7 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the load LC switching circuit (3). The emitter of the transistor Q2 is grounded.

5. The control circuit for adaptive power adjustment of induction cooker input voltage according to claim 1, characterized in that: The power input circuit (1) includes a live wire connection terminal CNL connected to the mains live wire, a neutral wire connection terminal CNN connected to the mains neutral wire, a capacitor C1 and a rectifier BG1. The live wire connection terminal CNL is connected to pin 1 of the rectifier BG1 and one end of the capacitor C1. The live wire connection terminal CNN is connected to the voltage detection circuit (4), the other end of the capacitor C1 and pin 2 of the rectifier BG1. Pin 3 of the rectifier BG1 is the DC positive output terminal connected to the filter circuit (6). Pin 4 of the rectifier BG1 is the DC negative output terminal grounded.

6. The control circuit for adaptive power adjustment of induction cooker input voltage according to claim 5, characterized in that: The live wire connection CNL is connected to one end of fuse FU1, and the other end of fuse FU1 is connected to one end of capacitor C1 and pin 1 of rectifier BG1.

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