DC-DC converter with temperature compensating circuit

A technology of temperature compensation circuit and DC converter, which is applied in the direction of converting DC power input to DC power output, output power conversion equipment, and conversion equipment without intermediate conversion to AC, which can solve complex and technically difficult problems, and achieve The effect of maintaining the stability characteristics

Inactive Publication Date: 2008-12-24
VASTVIEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also uses digital processing technology to achieve the purpose of temperature compensation, which is technically difficult and complicated to implement.

Method used

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  • DC-DC converter with temperature compensating circuit
  • DC-DC converter with temperature compensating circuit
  • DC-DC converter with temperature compensating circuit

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Embodiment Construction

[0090] The specific embodiments adopted by the present invention will be further described by the following embodiments and accompanying drawings.

[0091] FIG. 3 shows a control circuit diagram of the DC-DC converter of the present invention. For ease of comparison, if the circuit components in the control circuit of the present invention are the same as those in the existing control circuit, they are marked with the same reference numbers. In the following embodiments, the DC-to-DC converter control circuit for providing the data driving voltage required by the liquid crystal display is used as a preferred embodiment for illustration.

[0092] The DC-to-DC converter 2 a of the present invention includes a transistor switch unit 21 , the drain of which is connected to the connection node N1 between the inductance element L and the diode D in the voltage supply loop 201 , and the source is connected to the ground potential. The gate of the transistor switch unit 21 is connect...

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Abstract

The invention relates to a DC-to-DC converter with a temperature compensation circuit. The temperature compensation circuit is arranged between a feedback differential amplification circuit and an output voltage detection circuit of the DC-to-DC converter and is used for compensating the voltage level of the DC output voltage of the DC-to-DC converter caused by the change of the environmental temperature. The temperature compensation circuit comprises a temperature detection circuit used for detecting the environmental temperature and generating a temperature signal according to the detection result, and a current source circuit connected between the feedback signal input terminal of the feedback differential amplification circuit and the output voltage detection circuit, wherein the current source circuit can generate a current value according to the temperature signal generated by the temperature detection circuit, form a compensative voltage proportion to the current value and apply the compensative voltage to the DC output voltage, thereby regulating the voltage value of the DC output voltage. The temperature signal generated by the temperature detection circuit is a temperature signal with positive temperature characteristics or a temperature signal with negative temperature characteristics.

Description

technical field [0001] The present invention relates to a DC-to-DC converter, in particular to a DC-to-DC converter with a temperature compensation circuit. The DC-to-DC converter is particularly suitable as a power supply circuit for a liquid crystal display device. Background technique [0002] In many electronic devices, in order to supply a stable rated operating voltage required by the electronic device, a DC-to-DC conversion circuit must be configured. The main architecture of the DC to DC conversion circuit mainly includes transistor switching units (such as metal oxide half field effect transistors), comparators, sawtooth signal generation circuits, output voltage detection circuits, feedback differential amplifier circuits, reference voltage signal generation circuits, etc. The working principle of the circuit component is mainly to detect the voltage level state of the DC output voltage through the output voltage detection circuit, and generate a feedback signal to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/04H02M3/156G05F1/567G09G3/36
Inventor 沈毓仁朱弘琦王敏嘉
Owner VASTVIEW TECH
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