A predictive control method for inductor current in a non-isolated charging buck circuit
A technology of inductive current and predictive control, which is applied in the direction of control/adjustment system, electrical components, and adjustment of electrical variables, etc., which can solve the problems of poor control accuracy and slow dynamic response characteristics, and achieve the effect of improving control accuracy and quickly tracking given
Inactive Publication Date: 2017-03-29
GUANGDONG YUANJING ENERGY
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[0004] The purpose of the present invention is to provide a method for predictive control of inductor current in a non-isolated charging Buck circuit, which solves the problems of slow dynamic response characteristics and poor control accuracy in the prior art
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[0081] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0082] Such as figure 1 Shown is the Buck circuit diagram of the present invention, and the Buck circuit includes a low-voltage voltage source v L (The low-voltage voltage source is generally a storage battery or a super capacitor), and the low-voltage voltage source v L The negative pole of the high voltage voltage source v H (Generally, it is the voltage of the supporting capacitor connected in parallel with the DC bus. Since the capacitor voltage cannot change abruptly, it can be regarded as a voltage source in a short time), the negative pole of the diode D is connected, and the high voltage voltage source v H The anode of the switch tube S is connected to the collector of the switch tube S, and the emitter of the switch tube S is connected to the cathode of the diode D and the inductor L respectively.
[0083] The switch tube S is a t...
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The invention discloses an inductance current predictive control method used in a non-isolated charging Buck circuit. The next time nTS time is predicted by the inductance current value iL(n-1) at the previous time (n-1) TS time Then, according to the power conservation, calculate the duty ratio of the switching tube at nTS according to the predicted inductor current value at nTS; then, according to the steady-state expected value, the calculation results are converged, and the predicted value and the steady-state predicted value Directly calculate the control duty cycle of the corresponding switching tube, so as to obtain the final duty cycle Dx(n) of the switching tube, generate a PWM wave with a duty cycle of Dx(n) to control the switching tube, and realize the control of the inductor current at nTS time control. The present invention obtains the duty ratio through energy conservation, and can quickly calculate the duty ratio through energy conservation, quickly track the reference, and quickly track the reference when the reference suddenly changes, and the dynamic response and control precision are obviously improved.
Description
technical field [0001] The invention belongs to the technical fields of power electronic systems and electric vehicles, and in particular relates to a predictive control method for inductive current in a non-isolated charging Buck circuit. Background technique [0002] DC-DC converters have the advantages of high conversion efficiency, small size, and high control precision, and are widely used in various fields. In recent years, with the vigorous development of the electric vehicle industry in various countries, the research and development of peripheral products has gradually received great attention. In particular, how to effectively charge electric vehicle batteries has become a hot research issue. Moreover, in recent years, electric vehicle batteries have been continuously updated, and the requirements for new high-efficiency batteries on charging devices have become more stringent. Because the Buck circuit is simple to control and occupies a small space, it is widely...
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IPC IPC(8): H02M3/156
CPCH02M3/156H02M1/0009
Inventor 张琦刘昭孙向东安少亮任碧莹张波赵双双
Owner GUANGDONG YUANJING ENERGY