Resonance control device

Abstract

The invention discloses a resonance control device. A detecting controller is connected with a half-bridge resonance circuit or full-bridge resonance circuit, and the half-bridge resonance circuit comprises two electronic switches and a resonant tank. The full-bridge resonance circuit comprises four electronic switches and a resonant tank. The detecting controller receives voltages of a node between every two electronic switches. Due to the fact that stray capacitance exists in the electronic switches, when part of the electronic switches are switched on, the stray capacitance corresponding to the electronic switches can be discharged, low voltages are shown, the detecting controller drives the other electronic switches to be switched off to ensure that the electronic switches in the half-bridge resonance circuit and the electronic switches in the full-bridge resonance circuit can run in an alternate switching on and off switching mode, and then the through effect is avoided.

Description

technical field [0001] The invention relates to a control device, in particular to a resonance control device. Background technique [0002] In today's power supply industry, most switching power supplies use a half-bridge driver to drive an external load circuit; the reason is that the induced magnetic field can work in the first and third quadrants using the half-bridge architecture Among them, the forward or flyback architecture can only work in the first quadrant. In comparison, the driver of the half-bridge architecture is obviously much higher in work efficiency. [0003] Existing half-bridge driving devices are generally set up as follows: figure 1 As shown, it includes a signal controller 10, a first electronic switch 12, a second electronic switch 14 and a resonant tank 16, wherein the first electronic switch 12 and the second electronic switch 14 are both N-channel metal oxide half field effect transistor. Theoretically, the signal controller 10 controls the fir...

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Problems solved by technology

However, the signal controller 18 is also unstable. In actual conditions, when the fourth electronic switch 26 is turned from the on state to the off state but is still in the on state, the first electronic switch 20 will also be on. Make the energy lead to the resonance tank 16, causing a current surge between the first electronic switch 20 and the fourth electronic switch 26, so as to damage the first electronic switch 20 and the fourth electronic switch 26

Similarly, when the second electronic switch 22 turns from the on state to the off state, but is still in the on state, the third electronic switch 24 will also be turned on, so that the energy goes to the resonant tank 16, causing the second electron A current surge is generated between the switch 22 and the third electronic switch 24 to damage the second electronic switch 22 and the third electronic switch 24

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