Single-loop pulse regulating and controlling method and device of pseudo continuous mode switch power supply
A mode switch and pulse regulation technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of not being suitable for high-power occasions, achieve good anti-interference ability, broaden the application range, and overcome the complexity of detection and processing feedback Effect
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Embodiment 1
[0041] figure 1 It is shown that a specific embodiment of the present invention is a control method of a switching power supply, and its specific method is:
[0042] At the beginning of each switching cycle, the controller according to the output voltage V of the switching converter TD o with reference voltage V ref The relationship between selects the effective control pulse in the switching period, so as to realize the control of the switching converter TD. Its control pulse selection rule is: if V o below V ref , using the control pulse P H1 and P H2 Separately control the switching tube S in the pseudo-continuous switching converter 1 and S 2 ; Conversely, if V o higher than V ref , using the control pulse P L1 and P L2 Separately control the switching tube S 1 and S 2 .
[0043] The controller generates a control pulse P H1 and P H2 The method is: at the beginning of a certain switching cycle t 0 moment, the control pulse P H1 From low level to high leve...
Embodiment 2
[0058] Figure 7 It is shown that this example is basically the same as the first example, except that the converter TD of the switching power supply controlled by this example is a Boost converter.
Embodiment 3
[0060] Figure 8 It is shown that this example is basically the same as the first example, except that the converter TD of the switching power supply controlled by this example is a Buck-Boost converter.
[0061] The method of the present invention can be realized with analog device or digital device conveniently; Except the switching power supply that can be used for the converter in the above embodiment to form, also can be used for Cuk converter, BIFRED converter, flyback converter, half-bridge converter , full-bridge converter and other power circuits to form a switching power supply.
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