Bidirectional transducer, soft switching control method thereof and power supply device
A technology of bidirectional converter and control method, applied in control/regulation system, conversion of DC power input to DC power output, instruments, etc., can solve the problems of low power density and reliability, high turn-on loss of switching tube, and achieve higher power Density and reliability, loss reduction, cost reduction effect
Active Publication Date: 2018-01-19
SHENZHEN TIEON ENERGY TECH
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Problems solved by technology
[0005] The purpose of the present invention is to provide a soft switching control method of a bidirectional converter without adding any auxiliary devices, and to solve the problem of high turn-on loss, power density and reliability of the switch tube in the traditional bidirectional converter in a low-cost manner. low sex problem
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[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0030] see figure 1 , the bidirectional converter in the preferred embodiment of the present invention can be used in power supply equipment, which includes a detection circuit 10, a controller 20, a first capacitor C1, a second capacitor C2, a first switching tube S1, a second switching tube S2 and a Inductor L1, the first terminal of the first capacitor C1 and the first terminal of the second capacitor C2 serve as two positive poles P and O of the power supply respectively, the second terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are grounded, The capacity...
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The invention provides a bidirectional transducer and a soft switching control method thereof. According to the invention, the first output voltage of the bidirectional transducer and the inductive current flowing through an inductor are detected. According to the output voltage, the duty ratio of the PWM signal of a switching tube are adjusted and obtained. The turn-off moment of the switching tube is controlled as follows: before the turn-on of the switching tube, the discharge of an output junction capacitor thereof can be completed; a preset voltage is obtained by controlling the switchingfrequency and the duty ratio of the bidirectional transducer; the turn-on moment of the switching tube is controlled by detecting the inductance current so as to achieve the zero-voltage turn-on of the switching tube. On the premise that the no auxiliary device is required, the zero-voltage turn-on of the switching tube is realized through changing the control method. The loss of the transducer is reduced, and the power density and the reliability of the transducer are improved. The cost is reduced.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a bidirectional converter, a soft switching control method thereof, and power supply equipment. Background technique [0002] At present, the current Buck / Boost converter can be roughly divided into two types to achieve soft switching. 1) Let the converter work in DCM ((Discontinuous Conduction Mode, Discontinuous Conduction Mode) or critical mode to achieve zero current turn-on; 2) ) to achieve zero voltage or zero current turn-on by adding auxiliary devices. However, current implementations have disadvantages. [0003] 1) When the converter works in DCM or critical mode, it can realize zero-current turn-on, but it cannot realize zero-voltage turn-on. The energy of the output junction capacitance of the switch tube cannot be transferred before it is turned on. It is lost on the switch when it is turned on, and for high-frequency , Switching tube turn-on l...
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IPC IPC(8): H02M3/158
CPCY02B70/10
Inventor 曾海峰方耿
Owner SHENZHEN TIEON ENERGY TECH