Switching power supply phase-shifting parallel drive control circuit
A driving control circuit and switching power supply technology, which is different from the traditional switching power supply parallel driving control circuit and switching power supply phase-shifting parallel driving control circuit field, can solve the problems of high cost and large circuit ripple, and achieve low cost, Small circuit ripple effect
Active Publication Date: 2019-11-08
SHANGHAI POWER STATION
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Problems solved by technology
Among them, the cost of scheme a is very high, and the cost of scheme b is relatively high but the ripple of the circuit is very large ( Figure 7i )
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[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] like figure 1 and 2 As shown, this embodiment provides a phase-shifting parallel drive control circuit for switching power supplies, which includes a phase-shift signal generation circuit, a PWM drive signal generation and control circuit A, and a PWM drive signal generation and control circuit B.
[0028] The phase-shifting signal g...
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The invention discloses a phase-shifting parallel drive control circuit for a switching power supply, comprising a phase-shifting signal generating circuit, a PWM driving signal generating and controlling circuit A, and a PWM driving signal generating and controlling circuit B; the phase-shifting signal generating circuit is used to generate oscillation Signal and output two phase-shifted square wave signals with a phase difference of 180° based on the oscillating signal; PWM drive signal generation and control circuit A is used to receive the first square wave signal as a clock reference signal, generate an oscillating signal and based on the clock reference The signal and the oscillation signal output two PWM driving signals with a phase difference of 90° to control one main switching circuit of the switching power supply main circuit; the PWM driving signal generation and control circuit B is used to receive the second square wave signal as a clock reference signal, Generate an oscillating signal and output two PWM driving signals with a phase difference of 90° based on the clock reference signal and the oscillating signal to control another main switching circuit of the switching power supply main circuit.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a phase-shifting parallel drive control circuit for switching power supplies, which is different from traditional parallel drive control circuits for switching power supplies. The circuit is simple, high in reliability, and low in overall cost. Background technique [0002] In the process of designing a high-power switching power supply, when it is necessary to use two or more power supplies to output in parallel to meet the output power due to space layout or other restrictions, the general solution is: a. Do two or more independent power supplies and then parallel output; b Use the same group of driving signals to drive two or more main converters in parallel output ( figure 1 ). Among them, the cost of scheme a is very high, and the cost of scheme b is relatively high but the ripple of the circuit is very large ( Figure 7i ). Contents of the invention ...
Claims
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IPC IPC(8): H02M1/088
CPCH02M1/088H02M1/0006
Inventor 江登果王平
Owner SHANGHAI POWER STATION