Drive control method and drive control circuit
A drive control circuit, drive control technology, applied in the direction of control/adjustment system, electrical components, adjustment of electrical variables, etc., can solve the problem of large loss of asymmetrical half-bridge flyback converters, etc., to improve light load efficiency and improve efficiency , the effect of reducing the volume
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no. 1 example
[0071] Figure 3-1 It shows the circuit principle block diagram of the asymmetrical half-bridge flyback converter of the first embodiment of the present invention. The present invention is an improvement on the control strategy based on the prior art, which is called the light-load up-conversion control mode here asymmetrical half-bridge flyback converter. like Figure 3-1 As shown, the asymmetrical half-bridge flyback converter in the light-load up-conversion control mode includes a flyback circuit and a drive control circuit; the flyback circuit includes a primary side circuit and a secondary side output rectification filter circuit, and the primary side circuit consists of a filter capacitor Cin, The resonant capacitor Cr, the main switch tube QH, the clamp switch tube QL are connected with the primary winding of the transformer T; the secondary side output rectification filter circuit is connected with the rectifier diode D and the filter capacitor Cout; the drive control...
no. 2 example
[0078] like Figure 3-2 As shown, it is the circuit principle block diagram of the second embodiment of the asymmetrical half-bridge flyback converter in the light-load up-conversion control mode of the present invention. The difference from the first embodiment is that the upper transistor QH is a clamp switch transistor, and the lower transistor QL is The main switching tube, the control effects of the two circuits are similar, but the connection positions of each module are reversed accordingly.
no. 3 example
[0080] like Pic 4-1 As shown, it is the circuit of the third embodiment of the asymmetrical half-bridge flyback converter of the light-load up-conversion control mode of the present invention, which is the specific implementation circuit of the first embodiment of the present invention, and the dotted box 401 is the third embodiment of the present invention example of the drive control circuit, with Figure 4-3 As shown, a drive control circuit includes a drive control module and a light load detection control circuit. The drive control module is used for drive control of the transistor. The transistor includes a main switch tube and a clamp switch tube, wherein the drive control module adopts the main control chip , including the frequency adjustment terminal RT, the frequency adjustment terminal RT is grounded through the resistance Rt, and is used to set the operating frequency of the main control chip IC through the resistance Rt; the light load detection control circuit ...
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