Switching power supply phase shift parallel drive control circuit
A technology of driving control circuit and switching power supply, which is different from the parallel driving control circuit of traditional switching power supply and the field of switching power supply phase-shifting parallel driving control circuit, which can solve the problems of large circuit ripple and high cost, and achieve small circuit ripple. , the effect of low cost
Active Publication Date: 2018-07-06
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] Such as 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 signa...
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The invention discloses a switching power shift parallel driving control circuit, which comprises a phase shifting signal generation circuit, a PWM drive signal generation and control circuit A and aPWM driving signal generation and control circuit B. The phase shifting signal generation circuit is used for generating an oscillation signal and outputting a square wave signal with two phase shiftphases with a phase difference of 180 degrees based on the oscillation signal. The PWM driving signal generation and control circuit A is used for receiving a first square wave signal as a clock reference signal, generating an oscillation signal and controlling a main switching circuit of the switching power supply main circuit based on two PWM driving signals with a phase difference of 90 degreesbased on the clock reference signal and the oscillation signal; the PWM drive signal generation and control circuit B is used for receiving a second square wave signal as a clock reference signal, generating an oscillation signal, and controlling the other main switch circuit of the switching power supply main circuit based on two PWM driving signals with a phase difference of 90 degrees based onthe clock reference signal and the oscillation signal.
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