Alternating current and direct current universal electromagnetic range power generator

Abstract

The utility model provides an alternating current and direct current universal type electromagnetic range power generator, and relates to the technical field of electromagnetic induction heating, a power grid power supply is electrically connected with an IGBT inverter circuit through an alternating current and direct current conversion circuit, the IGBT inverter circuit is electrically connected with an LC high-frequency oscillation circuit, and the LC high-frequency oscillation circuit comprises an inductor L used for heating cookware; the power supply voltage sampling circuit collects power supply voltage of a power grid, the direct current sampling circuit collects output current of the alternating current-direct current conversion circuit, the IGBT driving circuit drives the IGBT inverter circuit, and the high-frequency current sampling circuit collects current flowing through the inductor L. The MCU digital processing unit outputs different frequency signals to the IGBT driving circuit according to voltage and current collected by the power supply voltage sampling circuit, the direct current sampling circuit and the high-frequency current sampling circuit, so that the working frequency of the LC high-frequency oscillation circuit is controlled, the output power is controlled, and different input power supplies can work normally.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic induction heating, in particular to an AC / DC universal electromagnetic cooker power generator. Background Art

[0002] In recent years, induction cookers have become increasingly accepted in various kitchens due to their safety without open flames and efficient heating, especially on ships and offshore platforms.

[0003] However, since various types of ships and offshore platforms need to meet various standards for their use, their power supply characteristics are often different, including AC and DC; and the voltage amplitude will also vary depending on the type of ship.

[0004] At present, the different characteristics of these power supplies mean that induction cooktops must be customized according to the nature of the power supply, resulting in low production efficiency, low standardization, poor product versatility, and great uncertainty in on-site after-sales service. Utility Model Content

[0005] The technical problem to be solved by the present invention is that the electromagnetic cooker in the prior art cannot adapt to a variety of input power sources. In order to overcome the above defects of the prior art, the present invention provides an AC / DC universal electromagnetic cooker power generator.

[0006] The utility model provides an AC / DC universal electromagnetic cooker power generator, comprising: an AC / DC conversion circuit, a power supply voltage sampling circuit, a DC current sampling circuit, an IGBT drive circuit, an IGBT inverter circuit, an LC high-frequency oscillation circuit, a high-frequency current sampling circuit, and an MCU digital processing unit;

[0007] The input end of the AC / DC conversion circuit and the input end of the power supply voltage sampling circuit are both electrically connected to the grid power supply, the output end of the AC / DC conversion circuit is electrically connected to the input end of the DC current sampling circuit and the power supply end of the IGBT inverter circuit respectively, and the input end of the IGBT inverter circuit is electrically connected to the output end of the IGBT drive circuit;

[0008] The LC high-frequency oscillation circuit includes a capacitor C2, a capacitor C3, and an inductor L for heating the cookware. The output end of the IGBT inverter circuit is electrically connected to the first end of the inductor L. The second end of the inductor L is electrically connected to the output end of the IGBT drive circuit through the capacitors C2 and C3 respectively. A high-frequency current sampling circuit is electrically connected between the output end of the IGBT inverter circuit and the first end of the inductor L.

[0009] The output end of the power supply voltage sampling circuit, the output end of the DC current sampling circuit and the output end of the high-frequency current sampling circuit are all electrically connected to the input end of the MCU digital processing unit, and the output end of the MCU digital processing unit is electrically connected to the input end of the IGBT drive circuit.

[0010] Compared with the existing technology, the AC / DC universal electromagnetic cooker power generator of the present application has the following advantages: the MCU digital processing unit samples various voltage and current signals through the power supply voltage sampling circuit, the DC current sampling circuit and the high-frequency current sampling circuit, and after processing, outputs signals of different frequencies to the IGBT drive circuit, thereby controlling the operating frequency of the LC high-frequency oscillation circuit, changing the equivalent impedance of the LC high-frequency oscillation circuit, and realizing the control of the output power size. It can ensure that input power sources of different properties can work normally, has good versatility, and improves production efficiency and after-sales service efficiency.

[0011] In one possible implementation, the AC-DC conversion circuit includes a bridge rectifier BR1, the AC input end of the bridge rectifier BR1 is electrically connected to the grid power supply, the positive pole of the DC output end of the bridge rectifier BR1 is electrically connected to the positive power supply pole of the IGBT inverter circuit through a DC current sampling circuit, and the negative pole of the DC output end of the bridge rectifier BR1 is electrically connected to the negative power supply pole of the IGBT inverter circuit.

[0012] Compared with the existing technology, the AC to DC conversion is achieved through the existing bridge rectifier, the circuit design is simple and easy to install.

[0013] In one possible implementation, a filter circuit is electrically connected between the DC current sampling circuit and the IGBT inverter circuit, and the filter circuit includes an inductor L1 and a capacitor C1; the DC current sampling circuit is electrically connected through a first end of the inductor L1, a second end of the inductor L1 is electrically connected to a positive power supply electrode of the IGBT inverter circuit, and a second end of the inductor L1 is electrically connected to a negative power supply electrode of the IGBT inverter circuit through the capacitor C1.

[0014] Compared with the existing technology, by setting up a filter circuit, interference is reduced, ensuring that the IGBT inverter circuit can be normally turned on or off, and also ensuring that the LC high-frequency oscillation circuit can operate stably.

[0015] In one possible embodiment, the IGBT inverter circuit includes a transistor IGBT1 and a transistor IGBT2; the collector of the transistor IGBT1 is electrically connected to the second end of the inductor L1, the base of the transistor IGBT1 and the base of IGBT2 are both electrically connected to the output end of the IGBT drive circuit, the emitter of the transistor IGBT1 is electrically connected to the collector of the transistor IGBT2, the emitter of the transistor IGBT1 is electrically connected to the first end of the inductor L, and the emitter of the transistor IGBT2 is electrically connected to the negative electrode of the DC output end of the AC / DC conversion circuit.

[0016] Compared with the prior art, the on / off operation is achieved through two transistors, which is convenient and simple to operate.

[0017] In a possible implementation, a high-frequency current transformer is provided between the emitter of the transistor IGBT1 and the first end of the inductor L, and the high-frequency current transformer is electrically connected to the high-frequency current sampling circuit.

[0018] Compared with the existing technology, by setting up a high-frequency current transformer, it only needs to be installed on the wire without being connected to the circuit. It is easy to assemble and disassemble and can better detect the current.

[0019] In a possible implementation manner, the MCU digital processing unit is also electrically connected to a power regulating switch for regulating the heating power of the cookware.

[0020] Compared with the prior art, the heating power of the cookware can be easily adjusted by setting a power adjustment switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a system block diagram of an electromagnetic cooker power generator with universal AC and DC power supply according to the present invention;

[0022] Figure 2 The utility model is a circuit diagram of an electromagnetic cooker power generator with universal AC and DC power supply.

[0023] Description of Figure Numbers:

[0024] 1-Grid power supply; 2-AC / DC conversion circuit; 3-Power supply voltage sampling circuit; 4-DC current sampling circuit; 5-Filter circuit; 6-IGBT drive circuit; 7-IGBT inverter circuit; 8-LC high-frequency oscillation circuit; 9-High-frequency current sampling circuit; 10-MCU digital processing unit. DETAILED DESCRIPTION

[0025] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0027] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] See also Figures 1 and 2 As shown, the embodiment of the present application discloses an electromagnetic cooker power generator of a universal AC / DC power supply type, comprising:

[0029] The grid power supply 1 is connected to the AC live wire and AC neutral wire of the grid power supply 1 through the two pins of the plug, thereby providing power to the subsequent circuits;

[0030] AC / DC conversion circuit 2, the input end of which is electrically connected to the grid power supply 1, and is used to convert the grid power supply 1 into DC power, generally using a bridge rectifier BR1 for conversion;

[0031] The power supply voltage sampling circuit 3 is used to collect the voltage characteristics of the grid power supply 1, such as the voltage amplitude and voltage frequency, so as to facilitate the subsequent judgment of whether the grid power supply 1 inputs AC or DC power;

[0032] A DC current sampling circuit 4 is electrically connected to the output end of the AC / DC conversion circuit 2 and is used to collect the current value at the output end of the AC / DC conversion circuit 2;

[0033] A filter circuit 5 is electrically connected to the output end of the AC / DC converter circuit 2 and is used to filter the power output by the AC / DC converter circuit 2 to ensure the stability of the output power. The filter circuit 5 includes an inductor L1 and a capacitor C1. The first end of the inductor L1 is electrically connected to the positive electrode of the DC output of the AC / DC converter circuit 2, and the second end of the inductor L1 is electrically connected to the negative electrode of the DC output of the AC / DC converter circuit 2 through the capacitor C1.

[0034] IGBT drive circuit 6 and IGBT inverter circuit 7, IGBT inverter circuit 7 includes transistor IGBT1 and transistor IGBT2; the collector of transistor IGBT1 is electrically connected to the second end of inductor L1, the base of transistor IGBT1 and the base of IGBT2 are both electrically connected to the output end of IGBT drive circuit 6, the emitter of transistor IGBT1 is electrically connected to the collector of transistor IGBT2, the emitter of transistor IGBT1 is electrically connected to the first end of inductor L, and the emitter of transistor IGBT2 is electrically connected to the negative electrode of the DC output end of AC / DC conversion circuit 2;

[0035] LC high-frequency oscillator circuit 8, including capacitors C2, C3, and an inductor L for heating the cookware, wherein a first end of the inductor L is electrically connected to the emitter of the transistor IGBT1, a second end of the inductor L is electrically connected to the collector of the transistor IGBT1 via capacitor C2, and the second end of the inductor L is also grounded via capacitor C3;

[0036] A high-frequency current sampling circuit 9 is provided between the emitter of the transistor IGBT1 and the inductor L used for heating the pot. The high-frequency current transformer is electrically connected to the high-frequency current sampling circuit 9. The high-frequency current sampling circuit 9 is used to collect the current value of the pot;

[0037] The MCU digital processing unit 10, the power supply voltage sampling circuit 3, the DC current sampling circuit 4 and the high-frequency current sampling circuit 9 are all electrically connected to the input end of the MCU digital processing unit 10, and the output end of the MCU digital processing unit 10 is electrically connected to the IGBT drive circuit 6.

[0038] The MCU digital processing unit 10 drives and outputs signals of different frequencies to the IGBT driving circuit 6 according to the power supply characteristics collected by the power supply voltage sampling circuit 3, the current value collected by the DC current sampling circuit 4 and the working current value collected by the high-frequency current sampling circuit 9.

[0039] In this embodiment, first, the power supply voltage sampling circuit 3 collects the input power supply voltage from the grid power supply 1, and connects it to the MCU digital processing unit 10 after rectification and amplification. The MCU digital processing unit 10 determines the characteristics of the input power supply based on the collected input power supply voltage, determines the corresponding control method, and automatically adjusts the parameters of the pot detection and the output control power of the LC oscillation circuit.

[0040] The characteristics of the input power supply include whether the power supply is AC or DC, the voltage amplitude, and the frequency of the power supply.

[0041] Then, the MCU digital processing unit 10 samples various current signals through the DC current sampling circuit 4 and the high-frequency current sampling circuit 9, and outputs signals of different frequencies to the IGBT drive circuit 6 through internal digital operations. The IGBT drive circuit 6 can drive and control the operation of the IGBT inverter circuit 7, and then control the operating frequency of the LC high-frequency oscillation circuit 8, and change the equivalent impedance of the LC high-frequency oscillation circuit 8 to achieve control of the output power.

[0042] Therefore, the electromagnetic cooker power generator with universal AC / DC power supply in this embodiment can realize normal operation with input power of different properties, thereby ensuring the versatility of the product and improving production efficiency and after-sales service efficiency.

[0043] Specifically, in this embodiment, the power supply voltage sampling circuit 3 , the DC current sampling circuit 4 and the high-frequency current sampling circuit 9 all use sampling circuits in the prior art to perform sampling and process to obtain corresponding voltages and currents.

[0044] The IGBT driving circuit 6 also uses a circuit in the prior art, and the MCU digital processing unit 10 only needs to be able to realize information processing, and can be a corresponding chip or terminal.

[0045] In this embodiment, the MCU digital processing unit 10 is also electrically connected to a power regulating switch for regulating the heating power of the cookware.

[0046] The specific operating steps of the electromagnetic cooker power generator of this embodiment are as follows:

[0047] In the first step, the induction cooker is connected to the grid power supply 1 through a plug. The power supply voltage sampling circuit 3 continuously collects the voltage signal of the grid power supply 1 and transmits it to the MCU digital processing unit 10. The MCU digital processing unit 10 determines whether the voltage signal is AC or DC, and calculates the effective value of the voltage of the grid power supply 1.

[0048] In the second step, the AC-DC conversion circuit 2 converts the voltage of the grid power supply 1 of any characteristics into the DC voltage required by the subsequent inverter circuit, ensuring that the current signal of the DC current sampling circuit 4 at the output end of the AC-DC conversion circuit 2 can be detected normally.

[0049] In the third step, the MCU digital processing unit 10 automatically calculates and sets the pot detection status parameters, the sampling coefficient of the DC current sampling circuit 4, and the sampling coefficient of the high-frequency current sampling circuit 9 when the induction cooker is working according to the characteristics of the voltage signal, thereby ensuring that the induction cooker can work normally under different power supply states.

[0050] In the fourth step, the MCU digital processing unit 10 sets the heating power value of the electromagnetic cooker according to different working gears of the power adjustment switch, and controls the electromagnetic cooker to start working.

[0051] The actual power value of the electromagnetic cooker is obtained by the MCU digital processing unit 10 sampling the input voltage and DC current of the electromagnetic cooker in real time, and calculating the real-time power value according to the power supply characteristics.

[0052] When the high-frequency current value collected by the high-frequency current sampling circuit 9 is not greater than the maximum allowable value, the MCU digital processing unit 10 adjusts the width of the output PWM, and controls the operating frequency of the IGBT inverter circuit 7 after isolation and amplification by the IGBT drive circuit 6, thereby controlling the impedance characteristics of the LC high-frequency oscillation circuit 8 and controlling the heating power to reach the set value.

[0053] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0054] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0055] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A universal AC / DC electromagnetic cooker power generator, characterized in that: include: AC / DC conversion circuit (2), power supply voltage sampling circuit (3), DC current sampling circuit (4), IGBT driving circuit (6), IGBT inverter circuit (7), LC high-frequency oscillation circuit (8), high-frequency current sampling circuit (9) and MCU digital processing unit (10); The input end of the AC / DC conversion circuit (2) and the input end of the power supply voltage sampling circuit (3) are both electrically connected to the grid power supply (1); the output end of the AC / DC conversion circuit (2) is electrically connected to the input end of the DC current sampling circuit (4) and the power supply end of the IGBT inverter circuit (7), respectively; and the input end of the IGBT inverter circuit (7) is electrically connected to the output end of the IGBT drive circuit (6); The LC high-frequency oscillation circuit (8) includes a capacitor C2, a capacitor C3, and an inductor L for heating a pot. The output end of the IGBT inverter circuit (7) is electrically connected to the first end of the inductor L. The second end of the inductor L is electrically connected to the output end of the IGBT drive circuit (6) through the capacitor C2 and the capacitor C3 respectively. A high-frequency current sampling circuit (9) is electrically connected between the output end of the IGBT inverter circuit (7) and the first end of the inductor L. The output end of the power supply voltage sampling circuit (3), the output end of the direct current sampling circuit (4), and the output end of the high-frequency current sampling circuit (9) are all electrically connected to the input end of the MCU digital processing unit (10), and the output end of the MCU digital processing unit (10) is electrically connected to the input end of the IGBT drive circuit (6).

2. The AC / DC universal electromagnetic cooker power generator according to claim 1, characterized in that: The AC / DC conversion circuit (2) comprises a bridge rectifier BR1, wherein the AC input end of the bridge rectifier BR1 is electrically connected to the grid power supply (1), the positive pole of the DC output end of the bridge rectifier BR1 is electrically connected to the positive power supply pole of the IGBT inverter circuit (7) through a DC current sampling circuit (4), and the negative pole of the DC output end of the bridge rectifier BR1 is electrically connected to the negative power supply pole of the IGBT inverter circuit (7).

3. The AC / DC universal electromagnetic cooker power generator according to claim 1, characterized in that: A filter circuit (5) is electrically connected between the DC current sampling circuit (4) and the IGBT inverter circuit (7), and the filter circuit (5) includes an inductor L1 and a capacitor C1; The DC current sampling circuit (4) is electrically connected via a first end of an inductor L1, a second end of the inductor L1 is electrically connected to a positive power supply electrode of an IGBT inverter circuit (7), and a second end of the inductor L1 is electrically connected to a negative power supply electrode of the IGBT inverter circuit (7) via a capacitor C1.

4. The AC / DC universal electromagnetic cooker power generator according to claim 3, characterized in that: The IGBT inverter circuit (7) comprises a transistor IGBT1 and a transistor IGBT2; The collector of the transistor IGBT1 is electrically connected to the second end of the inductor L1, the base of the transistor IGBT1 and the base of IGBT2 are both electrically connected to the output end of the IGBT drive circuit (6), the emitter of the transistor IGBT1 is electrically connected to the collector of the transistor IGBT2, the emitter of the transistor IGBT1 is electrically connected to the first end of the inductor L, and the emitter of the transistor IGBT2 is electrically connected to the negative electrode of the DC output end of the AC / DC conversion circuit (2).

5. The AC / DC universal electromagnetic cooker power generator according to claim 4, characterized in that: A high-frequency current transformer is provided between the emitter of the transistor IGBT1 and the first end of the inductor L, and the high-frequency current transformer is electrically connected to a high-frequency current sampling circuit (9).

6. The AC / DC universal electromagnetic cooker power generator according to claim 1, characterized in that: The MCU digital processing unit (10) is also electrically connected to a power regulating switch for regulating the heating power of the cookware.

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