Current sampling circuit suitable for Superbuck converter
A current sampling and sampling circuit technology, applied in the direction of measuring current/voltage, measuring only current, voltage/current isolation, etc., can solve the problems of increasing sampling resistance loss and affecting the efficiency of the whole machine, and achieve the effect of reducing sampling loss
Active Publication Date: 2017-06-23
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology
For the existing positive line current sampling method, when the current is large, the loss generated by the sampling resistor will increase, which will affect the efficiency of the whole machine; when the positive line voltage is high, the components used in the sampling circuit The withstand voltage level also needs to be improved; in addition, the sampling circuit and the control circuit are not electrically isolated
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[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the public implementation manners of the present invention in detail with reference to the accompanying drawings.
[0028] refer to image 3 , shows a schematic diagram of the connection between a current sampling circuit suitable for a Superbuck converter and a main circuit of the Superbuck converter in an embodiment of the present invention. In this embodiment, the current sampling circuit applicable to a Superbuck converter includes: a first sampling circuit and a second sampling circuit connected in series independently.
[0029] Wherein, it should be noted that, in this embodiment, the main circuit of the Superbuck converter may include: an input power supply V g, the first inductance L 1 , the second inductance L 2 , the first capacitance C 1 , the second capacitance C 2 , switch tube Q 1 , Diode D 1 and load resistor R. Amo...
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The present invention discloses a current sampling circuit suitable for a Superbuck converter. The current sampling circuit comprises a first sampling circuit and a second sampling circuit which are independently connected in series; the primary winding of a current sampling transformer T1 in the first sampling circuit is connected in series into the p1 to p3 point of the main circuit of the Superbuck converter and is used for collecting current iQ1 from the p1 to p3 point and transmitting the collected current iQ1 to the secondary side of the current sampling transformer T1, so that first current signals can be formed; and the primary winding of a current sampling transformer T2 in the second sampling circuit is connected in series into the p1 to p2 point of the main circuit of the Superbuck converter and is used for collecting current iC1 from the p1 to p2 point and transmitting the collected current iC1 to the secondary side of the current sampling transformer T2, so that second current signals can be formed. With the current sampling circuit of the present invention adopted, isolated sampling of the input current of the Superbuck converter can be realized, delay can be reduced, and loss can be reduced.
Description
technical field [0001] The invention belongs to the technical field of current sampling, in particular to a current sampling circuit suitable for a Superbuck converter. Background technique [0002] The Superbuck converter belongs to the buck converter topology. In the switching power supply topology, it has the same voltage transformation ratio as the Buck basic converter, that is, the output voltage is equal to the input voltage multiplied by the duty cycle. [0003] refer to figure 1 , showing a topology schematic diagram of an existing Superbuck converter; figure 2 , shows a topology schematic diagram of an existing basic Buck converter. Depend on figure 1 and 2 It can be seen that the Superbuck converter has a dual-inductor and dual-capacitor structure, which has the characteristics of high efficiency and continuous input and output current. Therefore, the Superbuck converter is gradually widely used in aerospace power systems. [0004] Compared with the tradition...
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IPC IPC(8): G01R15/18G01R19/00
CPCG01R15/18G01R19/0092
Inventor 贾鹏宇邹仁炜李雅琳朱劲梅邢杰李红林盛北飞张文爽
Owner CHINA ACADEMY OF SPACE TECHNOLOGY