Switching converter double pulse frequency modulation V<2> type control method and device thereof
A pulse frequency modulation, switching converter technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as affecting the stability of the converter, and achieve good system stability, short adjustment time, and strong anti-interference ability. Effect
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Embodiment 1
[0031] figure 1 Shown, a specific implementation of the present invention is: switching converter dual-edge pulse frequency modulation V 2 Type control method and its device V 2 PFM, its V 2 - The PFM device is mainly composed of a voltage detection circuit VS, a controlled error compensator VEC, a time operation unit TU, a variable frequency sawtooth wave generator SG, a double edge pulse modulator DPM and a driving circuit DR. The voltage detection circuit VS is used to obtain the output voltage value V os , the controlled error compensator VEC is used to generate the control voltage V c , the time operation unit TU is used to generate three periods of time t 1 , t 2 , t 3 , the variable frequency sawtooth wave generator SG is used to generate variable frequency sawtooth wave V saw and the sampling pulse signal CLK, the double-edge pulse modulator DPM is used to generate t 1 , t 2 , t 3 The timing control pulse signal controls the turn-on and turn-off of the switch...
Embodiment 2
[0042] Figure 7 It shows that the converter TD controlled in this example is a single-transistor forward converter, and the control device of the switching tube S adopts V 2 PFM. Figure 8 In Embodiment 2 of the present invention, output voltage, control voltage V c , time t 1 , time t 2 , time t 3 , a schematic diagram of the relationship between the sampling pulse signal CLK and the driving signal.
[0043] The specific working process and principle are: Figure 7 , Figure 8 It shows that the switching tube is turned off at any starting moment of the sampling pulse signal CLK, and at the same time, the voltage detection circuit VS detects the output voltage of the converter TD to obtain the output voltage value V os , and with reference voltage V ref It is sent to the controlled error compensator VEC to generate the control voltage V c . preset a constant off-time T OFF , t 1 , t 3 Same as off time and satisfy t 1 +t 3 =T OFF , then t 2 is the turn-on time...
Embodiment 3
[0046] Such as Figure 9 As shown, this example is basically the same as Embodiment 1, the difference is: the converter TD controlled by this example is Buck 2 converter.
[0047] The method of the present invention can also be used for double-tube forward converter, Cuk converter, Zeta converter, push-pull converter, push-pull forward converter, half-bridge converter except being applicable to the switching converter in the above embodiment , full-bridge converter and other circuit topologies.
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