Control method and controller of current limiting slip form controlled decompression DC-DC converter
A technology of DC converter and DC conversion, which is applied in the direction of converting DC power input to DC power output without intermediate conversion to AC conversion equipment, control/regulation systems, etc., which can solve problems such as device damage and large starting current, and achieve The effect of simple structure, wide stability range and fast dynamic response speed
Inactive Publication Date: 2010-12-08
ZHEJIANG UNIV
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[0003] Aiming at the problem that the starting current in the hysteresis loop sliding mode control dc-dc converter is too large when the system is started, which may easily cause damage to the device, the present invention provides a hysteresis loop sliding mode control step-down dc-dc converter with a current limiting function In the control method of the step-down DC-DC converter, a sliding mode control circuit with a current limiting control function is connected to the main circuit of the step-down DC-DC converter; the main circuit of the step-down DC-DC converter mainly works in the sliding mode control state, when the current is greater than the limit value, the sliding mode control circuit limits the current, and when the current is less than the limit value, the step-down DC-DC converter automatically returns to the original sliding mode control state to realize the automatic switching between the normal working state and the current limiting state, such as Figure 4 shown
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[0016] figure 1 , 2 Shown is the structural representation of the current-limiting sliding mode control DC-DC converter adopting the controller of the present invention, as figure 2 As shown, a hysteretic loop sliding mode control DC-DC converter with current limiting function includes a DC-DC converter main circuit 1, a controller and a driving circuit 5, and the control circuit consists of a sliding mode control loop 3, a current limiting The control loop 2 and the hysteresis comparator 4 are composed.
[0017] The sliding mode control loop 3 includes a subtractor A 2 , a proportional regulator A 1 , an adder A 3 , subtractor A 2 and proportional regulator A 1 The output of the adder A is connected to 3 The two inputs of the subtractor A 2 One of the two input ends of the sampling converter is connected to the output voltage signal v of the sampling converter o , the other end is connected to a given voltage signal v ref , the output error signal is connected to ...
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The invention discloses a method for controlling a cooling down direct current-dc converter of a flow limit slipform. The main circuit of the cooling down direct current-dc converter is connected with a slipform control circuit with a flow limit control function and mainly works in the slipform control state. When the current is more than the limit value, the circuit is controlled by the slipformto limit flow. When the current is less than the limit value, the cooling down direct current-dc converter returns to the original slipform control state automatically to realize automatic switch of ordinary working state and flow limit state. The invention has rapid dynamic response speed and wide range of stability, good applicability to non-linear load and capability of satisfying application occasions with high performance requirement.
Description
technical field [0001] The invention relates to a step-down DC-DC converter, in particular to a control method of a current-limiting sliding mode control step-down DC-DC converter and a controller thereof. Background technique [0002] The existing step-down converters usually use linearization control technology. On the premise that the frequency of the disturbance signal is much lower than the switching frequency, the state space averaging method is used to list the piecewise linear state equation of the switching converter, Then after averaging and perturbation processing, the circuit is described by a linear state equation. In this control system, the small-signal linearization model is a linearization process under fixed parameters, which is sensitive to changes in system parameters. When the load changes in a large range, especially with nonlinear loads, the switching converter has a dynamic The response speed is slow, and the output waveform is distorted. Today, the...
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IPC IPC(8): H02M3/10H02M3/155H02M1/32
Inventor 马皓张涛
Owner ZHEJIANG UNIV