Electromagnetic resonance circuit and electromagnetic heating device

Abstract

The invention provides an electromagnetic resonant circuit and an electromagnetic heating device. The electromagnetic resonant circuit comprises a power supply module, a first resonance circuit, a second resonance circuit, a first transistor assembly, a second transistor assembly, a reference signal detection circuit, a resonant synchronous detection circuit and a control chip. The resonant synchronous detection circuit comprises a first synchronous detection circuit and a second synchronous detection circuit. The control chip comprises a reference signal input port connected with the second end of the reference signal detection circuit, a first synchronous signal input port connected with the second end of the first synchronous detection circuit, a second synchronous signal input port connected with the second end of the second synchronous detection circuit, a first drive signal output port connected with the input end of the first transistor assembly, and a second drive signal output port connected with the input end of the second transistor assembly. According to the technical scheme of the invention, two heating circuits are arranged to realize the heating effect at the same time. Meanwhile, the signal loops of the above two circuits are prevented from interring each other, so that the reliability of the system is improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic resonance, in particular to an electromagnetic resonance circuit and an electromagnetic heating device. Background technique [0002] At present, the electromagnetic heating products that use two independently working coil disks to heat different parts of the pot need to use two IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) to control the two coil disks respectively. When using an IC (Integrated Circuit, integrated circuit) with a programmable pulse generator to control the IGBT, it will be affected by the IC (such as figure 1 Shown in 102) there is only one programmable pulse generator port (PPG port) limitation; meanwhile, the existing IC detects the synchronous signal port ( figure 1 There is only one pair of VA and VB shown in , so that the existing circuit can only time-multiplex the two IGBT drive loops and synchronous signal loops. This kind of circui...

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Problems solved by technology

[0002] At present, the electromagnetic heating products that use two independently working coil disks to heat different parts of the pot need to use two IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) to control the two coil disks respectively. When using an IC (Integrated Circuit, integrated circuit) with a programmable pulse generator to control the IGBT, it will be affected by the IC (such as figure 1 Shown in 102) there is only one programmable pulse generator port (PPG port) limitation; meanwhile, the existing IC detects the synchronous signal port ( figure 1 There is only one pair of VA and VB shown in , so that the existing circuit can only time-multiplex the two IGBT drive loops and synchronous signal loops. This kind of circuit usually has the following problems:

[0003] 1) The two heating circuits cannot be heated at the same time;

[0004] 2) There is a problem of voltage connection and mutual interference in the multiplexed synchronous signal circuit, which affects the accuracy of the synchronous signal. In severe cases, it will cause IGBT breakdown or the circuit will stop oscillating without heating;

[0005] 3) Even if the electronic switch circuit 104 is used to realize the switching of the IGBT control, there will be problems of complicated circuit control and poor reliability

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