Secondary feedback control method and secondary feedback control circuit
A feedback control and circuit technology, applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, to achieve the effects of wide application range, reduced size and cost, and optimized performance
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Embodiment 1
[0069] According to the idea of the isolated feedback method of the present invention, this embodiment provides a device for feeding back the secondary side voltage of the transformer to the primary side, such as Figure 4 As shown, it is a secondary side feedback switching converter, which includes four control devices of the secondary side feedback control circuit of the present invention: a sampler, a modulator, a receiver and a demodulator.
[0070] The sampler performs digital sampling on the output voltage, and converts the analog output voltage into a digital signal to be transmitted;
[0071] The modulator modulates the received digital signal to the output voltage to generate a regulated voltage, that is, when the digital signal to be transmitted is in the "0" state, the secondary winding is in the first working state, and the digital signal to be transmitted is in the "1" state. ” state, the secondary winding is in the second working state. These two different work...
Embodiment 2
[0083] Such as Figure 6 Shown is the circuit diagram of the switching power supply of this embodiment, a secondary side feedback switching converter, which includes: a three-winding transformer, which is composed of three windings: the primary winding NP, the secondary winding NS, and the auxiliary winding NA. Winding NP includes a first port 102 and a second port 103 , winding NS includes a first port 104 and a second port 105 , and winding NA includes a first port 106 and a second port 107 . The secondary side modulator is composed of a pressurization module and an encoding control module, wherein the pressurization module includes a secondary side degaussing circuit and a feedback switch, the feedback switch is a voltage booster, and the secondary side degaussing circuit includes a first port 110 and a second Two ports 111, two ports; an output capacitor, which includes two ports, a first port 131 and a second port 132; a feedback switch, which includes three ports: a drai...
Embodiment 3
[0092] Such as Figure 7 As shown, it is the circuit diagram of the third embodiment. The difference from the second embodiment is that there is no secondary side degaussing circuit and feedback switch, but a rectification feedback switch, which is the rectifier tube in the secondary side circuit of the traditional switching converter. . The rectification feedback switch includes three ports, the first port 233 is connected to the second port 105 of the secondary winding, the second port 234 is connected to the third port 112 of the output voltage encoding control module, and the third port 235 is connected to the switching power supply output negative terminal 109 connect.
[0093] The working mode of the rectification feedback switch in this embodiment is that the rectification feedback switch is cut off during the time period outside the degaussing phase, so as to prevent the charge on the output capacitor from pouring back; in the degaussing phase, its working state is ch...
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