Control method for improving dynamic response of Boost converter
A technology of dynamic response and control method, applied in the direction of control/regulation system, conversion of DC power input to DC power output, instrument, etc., can solve problems such as converter stability reduction, reduce current stress, improve dynamic response, prevent Effect of Inductor Saturation
Inactive Publication Date: 2019-05-07
沈阳贝特瑞科技有限公司
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[0003] Aiming at the deficiencies in the prior art that the dynamic response of the Boost converter reduces the stability of the converter, the present invention provides a control method for improving the dynamic response of the Boost converter that can improve the working stability of the converter
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[0026] The present invention will be further elaborated below in conjunction with the accompanying drawings of the description.
[0027] A kind of control method of the present invention improves the dynamic response of Boost converter, comprises the following steps:
[0028] 1) Assume that a Boost converter in continuous operation mode has entered a steady state, the output voltage and load current are stable, and the inductor current is continuous;
[0029] 2) Analyze and process the real-time output voltage, and judge the size of the two values through calculation. The formula is as follows:
[0030] V in ·T on ≥1.2·(V o -V in )·(T-T on ) (1-1)
[0031] V in ·T on ≤1.1·(V o -V in )·(T-T on ) (1-2)
[0032] Among them, V in is the sampled value of the input voltage, V o is the sampling value of the output voltage, T is the switching period of the switching tube Q, T on is the conduction time of Q;
[0033] 3) If formula (1-1) holds true, the converter enter...
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The invention discloses a control method for improving the dynamic response of a Boost converter, comprising the following steps: 1) assuming that the Boost converter in a continuous operation mode has entered a steady state, the output voltage and the load current are stable, and the inductor current is continuous; 2) analyzing and processing the real-time output voltage, and judging by calculation, wherein the formulas are Vin.Ton>=1.2.(Vo-Vin).(T-Ton) (1-1), Vin.Ton<=1.1.(Vo-Vin).(T-Ton) (1-2), wherein Vin is an input voltage sampling value, Vo is an output voltage sampling value, T is theswitching period of a switching transistor Q, and Ton is the on-time of the Q; and 3) If the formula (1-1) is tenable, enabling the converter to achieve the variable-frequency control. The method improves the dynamic response of the Boost converter, enables the converter to work stably even in the continuous mode, prevents the inductance saturation during the dynamic state, reduces the current stress of the switching tube Q and the diode D, and reduces the control difficulty of the loop.
Description
technical field [0001] The invention relates to a Boost converter, in particular to a controller for improving the dynamic response of the Boost converter. Background technique [0002] At present, in the continuous working mode of the known Boost converter, the inductor current is always greater than zero in one working cycle because the inductor current cannot change abruptly. Assume that a Boost circuit in continuous operation mode has entered a stable operating state, the output voltage and load current are stable, and the inductor current is continuous. When the load current suddenly increases, the output voltage will tend to drop, and the control loop will increase the conduction time T of the switch tube Q on , to increase the current of the inductor L. But the on-time T on The increase of will make the closing time T off Decrease (because the time of one cycle is fixed). Because the diode D is only turned on during the off period of the switch tube Q, the averag...
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Inventor范亚东周兴国刘忠菊
Owner沈阳贝特瑞科技有限公司