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Constant current regulating circuit having current sensing loop

A current sensing and regulating circuit technology, which is applied in the direction of regulating electric variables, lamp circuit layout, control/regulation system, etc., can solve the problem of high power consumption of sensing resistors, and achieve the effect of large design flexibility

Inactive Publication Date: 2009-03-25
VASTVIEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The loop of the switching circuit is also a loop of high current, so the power consumption generated by the sensing resistor is still very large

Method used

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  • Constant current regulating circuit having current sensing loop
  • Constant current regulating circuit having current sensing loop
  • Constant current regulating circuit having current sensing loop

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Embodiment Construction

[0099] The specific embodiments adopted by the present invention will be further described through the following embodiments and accompanying drawings.

[0100] First refer to FIG. 5 , which shows the control circuit diagram of the first embodiment of the present invention. This embodiment is a buck type half-cycle sensing constant current regulator circuit (Buck Type Half-Cycle Sensing Constant Current Regulator) applied in half-wave sensing. In order to simplify the labeling of components and facilitate correspondence, in the following description of the embodiments, circuit components that are the same or similar to the aforementioned existing control circuit are marked with the same component numbers.

[0101] The constant current regulating circuit 3 of the present invention shown in FIG. 5 includes a switch unit SW whose drain (first end) is connected to the input voltage Vin, and whose source (second end) is connected to the output voltage via an inductance element L. T...

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Abstract

The invention relates to a constant current regulating circuit with a current sensing loop. The constant current regulating circuit comprises a current sensing loop, the current sensing loop is connected with the switch unit of the constant current regulating circuit and used for detecting the state of the current of the switch unit and generates a sensing current, the strength of which has a proportional relation with that of the current passing through the switch unit, and the sensing current generates a sensing voltage after passing through a sensing resistor. A differential amplifying circuit generates an error voltage to a pulse-width modulation controller according to a set voltage and the received sensing voltage, then the pulse-width modulation controller controls the switch motion of the switch unit through a grid drive circuit, so as to supply a constant current to the load connected with the output voltage terminal.

Description

technical field [0001] The present invention relates to a constant current regulating circuit with a current sensing loop, in particular to a constant current regulating circuit with a current sensing loop for supplying a constant current to a load. Background technique [0002] LED (Light Emitting Diode) components are often used to provide lighting and backlight. Depending on the application, there are LED components of various colors or power values. Regardless of the type of LED element, generally the best electrical performance will be produced under constant current (Constant Current) driving. When designing the power supply circuit of the LED element, the industry always aims to provide a constant current output. Therefore, a constant current regulator circuit (Constant Current Regulator) is generally used to provide the working power required by the load. As for the connection type of each LED element in the load, only connecting all the LED elements in series can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02G05F1/00
Inventor 王敏嘉朱弘琦沈毓仁
Owner VASTVIEW TECH
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