A secondary side synchronous rectification control circuit and method based on primary side current sampling
A primary-side current, synchronous rectification technology, applied in control/regulation systems, high-efficiency power electronic conversion, conversion of DC power input to DC power output, etc. Fast response, improved reliability, and no delay
Active Publication Date: 2022-01-04
BEIJING SATELLITE MFG FACTORY
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Problems solved by technology
Although this solution has applications in aerospace, since the drive signal on the primary side may pass through after being reversed, the secondary side will cause current backfeeding and backpressure when it is turned off or lightly loaded, which may cause damage to the product. Therefore, the existing technology adopts the method of semi-synchronous rectification, that is, the secondary rectifier adopts synchronous rectification MOS transistor, and the freewheeling diode adopts diode freewheeling. This method does not have the problem of current backfeeding, but the efficiency of the product will decrease
Method used
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[0054] Such as image 3 As shown, a specific embodiment of the present invention is applied to a certain type of satellite-borne SAR antenna secondary power supply product. This product outputs 13V / 20A to power the subsequent stage after the primary bus voltage of 50V-70V is isolated and transformed. The circuit adopts Scheme of full bridge topology and synchronous rectification control.
[0055] In the specific embodiment above, the primary coil in the current transformer CT is connected to the main power circuit for collecting the current of the main power circuit. The main power circuit here is suitable for circuits with synchronous rectification such as single-ended forward, dual-tube forward, half-bridge circuit, full-bridge circuit, LLC, etc. The number of turns of the primary coil in the current transformer CT is 1 turn, the number of turns of the secondary coil is 100-300 turns, the turns ratio is N, and the sampling current Is=primary current Ip / N. The sampling curr...
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The invention relates to a secondary side synchronous rectification control circuit and method based on primary side current sampling, which belongs to the overall technical field of aerospace. The current sampling signal is output to the current-voltage conversion circuit; the current-voltage conversion circuit converts the current sampling signal into a voltage control signal, and outputs the voltage control signal to the hysteresis comparison circuit; the hysteresis comparison circuit filters the voltage control signal Compared with the current switching threshold, a synchronous rectification enable signal is generated and output to the enable end of the drive circuit; the drive circuit, according to the level of the synchronous rectification enable signal, improves the driving capability of the PWM signal input to the drive circuit and outputs it To the synchronous rectifier, used to control the switch of the synchronous rectifier. The present invention can effectively avoid the current backfeeding problem of the synchronous rectifier tube on the secondary side when the power supply is light-loaded or shut down, and realizes high-speed and reliable control of the synchronous rectifier tube.
Description
technical field [0001] The invention relates to a secondary side synchronous rectification control circuit and method based on primary side current sampling, which belongs to the general technical field of spacecraft secondary power supplies and is applicable to a DC / DC converter secondary side synchronous rectification control method. Background technique [0002] The rapid development of spacecraft puts forward higher and higher requirements for its power distribution system, especially as the complexity and functions of satellite loads are gradually strengthened, higher requirements are put forward for the miniaturization and high efficiency of on-board DC converters. The miniaturization and high efficiency of the DC converter require that it increase the operating frequency and reduce the heat consumption at the same time, so more and more synchronous rectification technologies are introduced in the design of the on-board DC converter. However, the control of the synchro...
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IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33592H02M1/08H02M1/0009Y02B70/10
Inventor 谢鹏飞刘密纪明明皇志启胡忠阳李嘉丽
Owner BEIJING SATELLITE MFG FACTORY