A synchronous rectification control circuit and method based on secondary side current sampling
A synchronous rectification and control circuit technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of no rectification dead zone adjustment capability, complex circuit design, poor availability, etc., to achieve low power consumption, circuit Simple, linear effect
Active Publication Date: 2018-04-27
BEIJING SATELLITE MFG FACTORY
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Problems solved by technology
This method requires accurate sampling of the voltage at the DS terminal, and requires the use of a high-speed comparator to achieve efficient control. The circuit design is complex, there are many components, and the cost is high.
[0005] In the prior art, synchronous rectification control is also implemented based on secondary side current acquisition. For example, the patent publication number applied by Huawei Technologies Co., Ltd. is CN 103475195 A, titled "A Synchronous Rectification Control Circuit and Synchronous Rectification Control Method". The patent uses a current mirror comparator as the core logic interpretation device. In the aerospace application field, the availability of the device is poor, the circuit is more complicated, the power consumption is higher, and it does not have the ability to adjust the rectification dead zone
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[0043] The basic idea of the present invention is to provide a synchronous rectification control circuit based on secondary side current sampling, including: a current transformer CT, connected in series to the secondary side, sampling the loop current of the secondary side, converting the power current into a small current detection signal; the current-voltage conversion circuit, whose input terminal is connected to the current transformer CT, the current-voltage conversion circuit obtains the sampling current of the secondary side according to the current detection signal, and outputs a voltage control signal corresponding to the current width when the current is greater than the preset threshold; the drive circuit , receiving the voltage control signal of the current-voltage conversion circuit, outputting the driving signal corresponding to the width, and realizing the switching of the synchronous rectification circuit. According to the synchronous rectification circuit an...
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The present invention is a synchronous rectification control circuit and method based on secondary side current sampling, which belongs to the overall technical field of aerospace. It is a small current detection signal; the input terminal of the current-voltage conversion circuit is connected to the current transformer CT, and the current-voltage conversion circuit obtains the secondary-side sampling current according to the current detection signal. When the current is greater than the preset threshold, it outputs a voltage control corresponding to the current width signal; the drive circuit receives the voltage control signal of the current-voltage conversion circuit, outputs a drive signal corresponding to the width, and realizes the switch of the synchronous rectification circuit. According to the synchronous rectification circuit and method of the present invention, high-speed and reliable synchronous rectification tube control can be realized, and the control is simple and easy to realize.
Description
technical field [0001] The invention relates to a synchronous rectification control circuit and method based on secondary side current sampling, and belongs to the technical field of spacecraft synchronous rectification control circuits. Background technique [0002] The rapid development of spacecraft puts forward higher and higher requirements for its power distribution system, especially with the gradual strengthening of satellite load complexity and functions, higher requirements are put forward for the miniaturization and high efficiency of on-board DC-DC converters. The miniaturization and high efficiency of DC-DC converters require that the operating frequency be increased while reducing heat consumption. Therefore, more and more synchronous rectification technologies are introduced in the design of on-board DC-DC converters. However, the control of the synchronous rectification circuit is relatively complicated, and it is easy to bring reliability risks while obtaini...
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IPC IPC(8): H02M7/06
Inventor 刘密谢鹏飞纪志坡
Owner BEIJING SATELLITE MFG FACTORY