Control circuit of double-tube forward power converter and control method thereof
A power converter and control circuit technology, applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., can solve the problem of changing switching frequency, not considering PWM signal, and not being able to apply power Converter and other problems, to achieve fast dynamic response, to achieve the effect of charging and discharging balance
Inactive Publication Date: 2012-06-27
YANGZHOU XINHAO HEAVY MACHINERY
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Problems solved by technology
Although these control circuits can better improve the dynamic response of the power converter, they all have at least one of the following disadvantages: 1) variable switching frequency; 2) the operating frequency is mainly determined by the equivalent series resistance (ESR) of the output capacitor ; 3) It does not take into account the situation when the PWM signal is limited, so it cannot be applied to isolated power converters
Method used
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Embodiment 1
[0041] like figure 1 In the control circuit, v in is the input voltage, v o is the output voltage. The DC voltage that changes within the rated range is input from the output terminal v in , it may contain a larger ripple component, the PWM control signal provided by the digital controller 8 controls the corresponding mos tube in the switch tube power circuit 1 to turn on and off, and generates an AC voltage signal on the secondary side of the energy storage transformer 2, It is rectified into a DC square wave signal by the synchronous rectification circuit 3, and then a stable and accurate output voltage is formed at both ends of the output capacitor C by the filter circuit 4. v o , the load R connected to the power converter is connected in parallel to both ends of the output capacitor C; the voltage division detection circuit 5 is connected in parallel to both ends of the load R to measure the output voltage v o The actual value, and the voltage regulator tube W i...
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The invention relates to a control circuit of a power converter and discloses a control circuit of a double-tube forward power converter and a control method thereof. The control circuit comprises a switching tube power circuit, an energy storage transformer, a synchronous rectifying circuit, a filtering circuit, a voltage distribution detecting circuit, a differential amplifying circuit, an A / D (Analog / Digital) conversion circuit and a digital controller; the control method comprises the following steps: when the power converter works in a steady state, the digital controller adopts a PID (Proportion Integration Differentiation) control mode for stably outputting voltage; and when the voltage distribution detecting circuit detects that the fluctuation of the output voltage is more than a given value, the digital controller retains parameters of a PID control algorithm and duty ratio signals, and switches the PID control mode into a CBC (Cornering Brake Control) control mode. The invention is widely applied in the control circuit of the double-tube forward power converter and is applicable to any isolated type DC / DC (Direct-Current / Direct Current) power converter.
Description
technical field [0001] The present invention relates to a control circuit of a power converter, more specifically, to a control circuit of a dual-tube forward power converter and a control method thereof. Background technique [0002] With the continuous emergence of a new generation of power integrated electronic devices, switching power supplies are more and more widely used in our daily life. Compared with the traditional linear power supply, the control accuracy and efficiency of the switching power supply have been greatly improved. The forward converter is an isolated DC-DC power converter with a simple circuit structure. It is widely used in small and medium power applications requiring electrical isolation, such as hybrid electric vehicles, aviation power supplies, new energy development and other DC switching power supplies. . In order to overcome the magnetic reset problem of the forward converter, forward converters with various topological structures such as ac...
Claims
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Inventor 刘晓东方炜刘雁飞
Owner YANGZHOU XINHAO HEAVY MACHINERY