Half-bridge circuit for sensing heating and electromagnetic stove system

Abstract

The invention discloses a half-bridge circuit for sensing heating and an electromagnetic stove system. The half-bridge circuit comprises a switch series circuit composed of a first power switch and a second power switch, a first capacitor connected with the switch series circuit in parallel, a first absorbing capacitor connected to the first power switch in parallel, a second absorbing capacitor connected to the second power switch in parallel, a capacitor series circuit connected to the two ends of the switch series circuit in parallel and composed of a first resonant capacitor and a second resonant capacitor, an inductor connected between a connection node of the first resonant capacitor and the second resonant capacitor and a connection node of the first power switch and the second power switch and a one-way breakover device connected to the first resonant capacitor in parallel or connected to the second resonant capacitor in parallel and used for preventing the resonant capacitors from being charged reversely. By means of the half-bridge circuit, the two power switches can keep the zero voltage switch state under the nonsymmetrical working state in a large range, the switch loss is reduced, and the reliability of the half-bridge circuit is improved.

Description

technical field [0001] The invention relates to the field of induction heating circuits, in particular to a half-bridge circuit for induction heating and an electromagnetic cooker system. Background technique [0002] The existing half-bridge circuit for induction heating can adjust the working frequency under symmetrical working conditions to realize the change of the output power. In the case of a cooker with multiple burners, if the operating frequencies of the half-bridge circuits driving different burners are inconsistent, when their frequency difference falls within the hearing range of the human ear, noise audible to the user will be generated, affecting User experience, so it is generally required that the half-bridge circuits of different burners work at the same frequency, or the frequency difference is beyond the range of human hearing to avoid noise. [0003] When different half-bridge circuits work at the same frequency, the output power of each half-bridge cir...

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Problems solved by technology

[0003] When different half-bridge circuits work at the same frequency, the output power of each half-bridge circuit will vary according to user needs, which will cause the half-bridge circuits of some burners to work in an asymmetric state. When this asymmetry When the state reaches a certain level, one of the power switches with a short conduction time will be separated from the zero-voltage switching state, resulting in a sharp increase in switching loss, an increase in the temperature of the power switch, and even damage; the half-bridge circuit needs to use a higher level Power switches or better heat dissipation measures to ensure the normal operation of the half-bridge circuit in the case of asymmetrical operating frequency to reduce noise, resulting in increased circuit costs for the half-bridge circuit applied to induction heating

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