A dc/dc for bidirectional constant current and its control method
A control method and a technology of a control module, which are applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve problems such as increasing the complexity of software algorithms
Active Publication Date: 2016-04-27
BYD CO LTD
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Therefore, it is necessary to design a corresponding algorithm for judging and controlling the switching of the constant current mode, which increases the algorithm complexity of the software
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[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0021] The inventors of the present invention found that the existing DC / DC (such as figure 1 The following defects exist: 1) At constant current, due to only controlling a single IGBT bridge arm (T1 or T2), when the output current is small, the energy stored by the inductor L when the controlled IGBT bridge arm is turned on Less, it is not enough to support the energy demand of the load when the controlled IGBT bridge arm is turned off and the diode freewheels, so that the inductor current will continue to be 0 A when the controlled IGBT bridge arm is turned off, th...
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A DC / DC for a dual-direction constant current comprises a driving module, a sampling module and a control module. The driving module comprises a first switch unit, a second switch unit, a first capacitor, a second capacitor and an inductor. The first end of the first switch unit is connected with the first end of a first power source. The second end of the first switch unit is respectively connected with the first end of the inductor and the first end of the second switch unit. The second end of the inductor is connected with the first end of a second power source. The second end of the second power source is connected with the second end of the second switch unit and the second end of the first power source. The first capacitor is in parallel connection to the two ends of the first power source. The second capacitor is in parallel connection to the two ends of the second power source. The sampling module collects the current of the inductor and the current of the first power source side or the current of the second power source side. The control module adjusts the duty ratio of the first switch unit and the second switch unit according to a target current, the current of the inductor and the current of the first power source side or the current of the second power source side, and achieves the dual-direction constant current by controlling the complementary conductive mode of the first switch unit and the second switch unit. A method for controlling the dual-direction constant current is simplified.
Description
technical field [0001] The present invention specifically relates to a DC / DC for bidirectional constant current and a control method thereof. Background technique [0002] Existing DC-to-DC power supplies (DC / DC) for bidirectional constant current generally need to switch the constant current mode of the drive module and complex control methods to achieve constant current, such as figure 1 As shown in the circuit diagram of the drive module, the existing DC / DC for bidirectional constant current includes two constant current modes, namely the buck mode and the boost mode. In the buck mode, the current flows from the high-voltage side UHigh to the low-voltage side ULow , the software only controls the upper bridge arm T1 of the IGBT, and the lower bridge arm T2 is kept off during the constant current process. When T1 is turned off, the freewheeling diode D2 of T2 is used for freewheeling; ULow flows to the high voltage side UHigh, the software only controls the lower bridge a...
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IPC IPC(8): H02M3/156
Inventor 杨荣春孙嘉品张翔尹韶文
Owner BYD CO LTD