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Control method and device of DC-DC conversion circuit

A technology of DC conversion circuit and control method, which is applied in the electrical field and can solve problems such as unstable output voltage

Pending Publication Date: 2017-03-22
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above technical problems, the present invention provides a control method and device for a DC-DC conversion circuit, which solves the problem that the output voltage of the DC-DC conversion circuit is unstable under light load or no-load conditions

Method used

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  • Control method and device of DC-DC conversion circuit
  • Control method and device of DC-DC conversion circuit

Examples

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no. 1 example

[0030] Such as figure 1 As shown, the embodiment of the present invention provides a control method of a DC-DC conversion circuit, including:

[0031] Step 101, obtain the output voltage value of the output terminal of the DC-DC conversion circuit.

[0032] In this embodiment, the output voltage value of the output terminal of the DC-DC conversion circuit is collected in real time, so as to determine the current output voltage of the DC-DC conversion circuit. According to the output voltage value, it is determined whether the output voltage of the DC-DC conversion circuit is in a stable state. Specifically, a voltage sensor can be set to obtain the output voltage value of the output terminal of the DC-DC conversion circuit in real time.

[0033] Step 102, when the output voltage value is lower than a first preset voltage threshold and the DC-DC conversion circuit is in a non-working mode, adjust the DC-DC conversion circuit to an operating mode; when the output voltage When...

no. 2 example

[0049] Such as Figure 4 As shown, the embodiment of the present invention also provides a control device for a DC-DC conversion circuit, including:

[0050] The acquisition module 410 is configured to acquire the output voltage value of the output terminal of the DC-DC conversion circuit.

[0051] In this embodiment, the obtaining module 410 collects the output voltage value of the output terminal of the DC-DC conversion circuit in real time, so as to determine the current output voltage of the DC-DC conversion circuit. According to the output voltage value, it is determined whether the output voltage of the DC-DC conversion circuit is in a stable state. Specifically, a voltage sensor can be set to obtain the output voltage value of the output terminal of the DC-DC conversion circuit in real time.

[0052] The control module 420 is configured to adjust the DC-DC conversion circuit to the working mode when the output voltage value is lower than a first preset voltage thresho...

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Abstract

The invention discloses a control method and device of a DC-DC conversion circuit. The method comprises the steps as follows: an output voltage value of an output end of the DC-DC conversion circuit is obtained; the DC-DC conversion circuit is adjusted into a working mode when the output voltage value is lower than a first preset voltage threshold and the DC-DC conversion circuit is in a non-working mode; and the DC-DC conversion circuit is adjusted into the non-working mode when the output voltage value is higher than a second preset voltage threshold and the DC-DC conversion circuit is in the working mode, wherein the first preset voltage threshold is smaller than the second preset voltage threshold. According to the control method and device, stable output voltage of the DC-DC conversion circuit can be ensured when the DC-DC conversion circuit is in a no-load condition or a light load condition.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a control method and device for a DC-DC conversion circuit. Background technique [0002] At present, the DC-DC conversion circuit of the isolated vehicle external power supply system mostly adopts the series resonant circuit topology. By adjusting the switching frequency, the purpose of adjusting the output voltage is achieved. However, under light load or no-load conditions, the output voltage of the step-up DC-DC conversion circuit will always increase; for the step-down DC-DC conversion circuit, the output voltage will always decrease without control . The topological efficiency of the series resonant circuit is high, but under light load or no-load conditions, it is difficult to obtain a stable output voltage only by adjusting the frequency. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a control me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 王晓媛刘立志蒋荣勋王鹏
Owner BEIJING ELECTRIC VEHICLE
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