Bridgeless circuit for induction cooker and induction cooker
A technology of bridge circuit and induction cooker, which is applied in the circuit field, and can solve the problems of large inrush current of power switch 210, harsh sound, and large instantaneous loss of power switch 210, etc.
Active Publication Date: 2018-10-23
ON BRIGHT ELECTRONICS SHANGHAI
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Problems solved by technology
When the power switch 210 operates for the next time T 1 Initially, the switching voltage V on the power switch 210 IGBT will be from the AC input voltage V AC The maximum value of the moment drops to zero volts, a large inrush current will be generated on the power switch 210, resulting in a huge instantaneous loss of the power switch 210
In addition, when the circuit system of the induction cooker exits the burst mode and the power switch 210 is turned on for the first time, the half-sine wave voltage Vin is at the AC input voltage V AC The maximum value, the input current of the induction cooker will be charged to a larger current by the sinusoidal half-wave voltage Vin, so the current flowing through the electromagnetic coil in the induction cooker will suddenly change from zero to a larger value, and the sudden change will usually produce harsh sound
Method used
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[0042] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configurations and algorithms presented below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention.
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The invention discloses a bridgeless circuit used for an electromagnetic oven, and an electromagnetic oven. The bridgeless circuit comprises a first switch connected in parallel with a first diode with a full wave rectifier bridge; a second switch connected in parallel with a second diode of the full wave rectifier bridge; a third switch connected in parallel with a third diode of the full wave rectifier bridge; a fourth switch connected in parallel with a fourth diode of the full wave rectifier bridge; a first control unit configured to control on-off of the first switch and the fourth switch; and a second control unit configured to control on-off of the second switch and the third switch. According to the invention, when a power switch in the electromagnetic oven is at a cut-off state in an intermittent work mode, the first control unit, when AC input voltages are positive, controls the first switch and the fourth switch to be switched on, and when the AC input voltages are negative, controls the first switch and the fourth switch to be switched off; and the second control unit, when the AC input voltages are positive, controls the second switch and the third switch to be switched off, and when the AC input voltages are negative, controls the second switch and the third switch to be switched on.
Description
technical field [0001] The invention generally relates to the circuit field, and more specifically relates to a bridgeless circuit for an electromagnetic cooker and the electromagnetic cooker. Background technique [0002] Induction cooker, also known as induction cooker, is the product of modern kitchen revolution. It allows heat to be generated directly at the bottom of the pot without open flame or conduction heating, so the thermal efficiency has been greatly improved. The induction cooker mainly includes the following two parts: a circuit system for generating a high-frequency alternating magnetic field; and a structural casing for fixing the circuit system and carrying the pot. [0003] figure 1 A schematic diagram showing the working principle of an induction cooker. Such as figure 1 As shown, the induction cooker adopts the principle of magnetic field induction eddy current, and uses high-frequency alternating current to generate countless closed magnetic fields t...
Claims
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IPC IPC(8): H05B6/06
CPCH05B6/062H05B2206/02
Inventor 吕华伟方倩
Owner ON BRIGHT ELECTRONICS SHANGHAI