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Control method and device of power converter of resonance topological circuit

A technology of power converter and resonant topology, applied in the field of control, can solve the problem of monotonicity of LLC power converter and other resonant topology circuits, and achieve the effect of ensuring monotonicity

Active Publication Date: 2013-02-27
VERTIV CORP
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  • Abstract
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a power converter of a resonant topology circuit for the defect that the output of the controller in the prior art cannot keep the LLC power converter and other resonant topological circuits monotonous in the entire PWM working range. Control method and device for ensuring the monotonicity of the power converter in the entire PWM working range

Method used

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  • Control method and device of power converter of resonance topological circuit
  • Control method and device of power converter of resonance topological circuit
  • Control method and device of power converter of resonance topological circuit

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Embodiment Construction

[0044] Because the resonant circuit has different combinations of frequencies and duty ratios for the same gain, it is possible to use a combination of frequencies and duty ratios with good monotonicity instead of a combination of frequencies and duty ratios with poor monotonicity, so as to ensure that the power converter can control It has good monotonicity in the output range of the device.

[0045] Figure 8 It is an embodiment of the control method of the power converter of the resonant topology circuit of the present invention, and the method starts from step S1. In step S2, it is determined whether the output control amount of the controller is smaller than a first set value. If so, execute step S6, control the operating frequency of the converter to increase along the third curve, and increase the duty cycle along the first curve; otherwise execute step S3, determine whether the output control amount of the controller increases to be equal to the first curve set value...

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Abstract

The invention relates to a control method and a device of a power converter of a resonance topological circuit, wherein the control method of the power converter of the topological circuit comprises the steps of regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. The control device of the power converter of the resonance topological circuit comprises a control module, which is used for regulating the frequency of the power converter and the combination of the duty ratio to ensure that the power converter has good monotonicity in the whole output range of the control device. When being implemented, the method and the device of the invention can ensure the monotonicity of the power converter of the resonance topological circuit in the whole PWM work range.

Description

technical field [0001] The invention relates to the field of control, more specifically, to a method and device for controlling a power converter of a resonant topology circuit. Background technique [0002] LLC is used as a DC / DC conversion circuit topology. Through reasonable design, it can realize zero-voltage turn-on in almost the full load range, and realize the natural zero-crossing of the secondary rectifier diode in the rated state, and there is almost no reverse recovery, which greatly improves the efficiency of the converter. At the same time, the sine The current waveform makes the high-order harmonic component of the switching frequency very small, which is beneficial to the design of electromagnetic interference. Its frequency gain curve is as figure 1 shown. [0003] from figure 1 It can be seen that as the output voltage decreases (Gdc decreases) and the load decreases, the operating frequency of the power converter needs to increase continuously. However, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
Inventor 陈滨
Owner VERTIV CORP
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