A DC/DC Converter Constant Current Mode Control Method

A control method and a technology of a converter, which are applied to conversion equipment with intermediate conversion to AC, output power conversion devices, electrical components, etc., can solve problems such as DC/DC converter shutdown, and achieve optimal power selection, Effects of cost reduction and power reduction

Active Publication Date: 2019-04-23
SAIC MOTOR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a DC / DC converter constant current mode control method, which can solve the problem that the DC / DC converter is shut down when the vehicle current is too large

Method used

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  • A DC/DC Converter Constant Current Mode Control Method
  • A DC/DC Converter Constant Current Mode Control Method
  • A DC/DC Converter Constant Current Mode Control Method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] see figure 1 and figure 2 , a DC / DC converter constant current mode control method, the high-voltage direct current of the whole vehicle is input to the DC / DC converter, the filter circuit in the DC / DC converter filters the high-voltage input direct current, and then enters the first-stage boosting circuit, Boost the voltage to a stable high voltage, then convert the direct current into alternating current through the full bridge circuit, convert the high voltage alternating current into low voltage alternating current through the transformer, and then rectify the low voltage alternating current into low voltage direct current through the synchronous rectifier, and then pass through the output filter circuit After the low-voltage output, the main controller controls the on-off of the full-bridge circuit through the conversion controlle...

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Abstract

The invention relates to a DC / DC converter technology for automobile electrical appliances, in particular to a constant current mode control method of the DC / DC converter. A DC / DC converter constant current mode control method, a current sampling circuit is installed in front of the low-voltage output end, the output current value is input into the main controller through the output current sampling signal, and the main controller compares the output current with the rated current, when the When the output current is higher than the rated current, the main controller controls the opening and closing of the full-bridge circuit through the conversion controller, adjusts the conversion current, enters the constant current mode, and the DC / DC converter outputs according to the constant rated current; when the output current is less than the rated current When current, the DC / DC converter outputs according to the output current. And in the constant current mode, the constant current switching time is less than the overcurrent protection delay time, so that the constant current switches first, so as to protect the DC / DC converter components from being damaged by the influence of large current, and ensure that the whole vehicle is uninterrupted under extreme conditions. . The invention can solve the problem that the DC / DC converter is turned off when the current of the whole vehicle is too large.

Description

technical field [0001] The invention relates to a DC / DC converter technology of an automobile electrical appliance, in particular to a DC / DC converter constant current mode control method. Background technique [0002] A DC / DC converter is a converter that converts direct current into direct current, hereinafter referred to as DC / DC. At present, the DC / DC converter in the automotive electrical industry is in constant voltage mode. Although it has the advantage of stable voltage, when the load current of the vehicle is greater than the rated output, the DC / DC converter in constant voltage mode will turn off the output. If designed according to this mode, the power selection of the converter needs to cover the maximum current that occurs in the vehicle, and the power selection is large, which is not conducive to the cost of the vehicle. If the DC / DC converter adopts the constant current mode control method, you only need to consider the average current of the vehicle running,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/22H02M1/32
CPCH02M1/32H02M3/22H02M1/0003H02M1/325
Inventor 陈东李真张明森
Owner SAIC MOTOR
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