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Constant current driver and control method thereof

A technology of constant current driver and control signal, applied in control/regulation systems, instruments, regulating electrical variables, etc., can solve the problems of small board-level area and low system cost, etc.

Inactive Publication Date: 2013-11-13
郑儒富
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings of the existing constant current driver, the object of the present invention is to propose a constant current driver and its control method. The constant current driver adopting this scheme can obtain comparative advantages without using magnetic components such as inductors or transformers. High efficiency, relatively low system cost, EMI, and relatively small board area, etc.

Method used

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  • Constant current driver and control method thereof
  • Constant current driver and control method thereof
  • Constant current driver and control method thereof

Examples

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no. 1 example

[0084] refer to figure 2 , shows a functional block diagram 200 of a first embodiment of a constant current driver according to the present invention, including a voltage source 101 providing an input voltage, a load circuit 102 coupled in series with the voltage source 101, and a load circuit coupled in series to the load The switch control circuit 104 and the current detection circuit 103 in the load current Iout loop of the circuit 102. Wherein, the input voltage provided by the voltage source 101 includes: a voltage provided by a DC voltage source, or a voltage rectified by an AC voltage source through a rectifier bridge. The load circuit 102 includes a linear load and a nonlinear load. In one embodiment, the linear load is a resistor, and the nonlinear load is a light emitting diode. The current detection circuit 103 of the constant current driver includes a first resistor 201 . The load current Iout of the load circuit 102 flows through the first resistor 201, the cur...

no. 2 example

[0086] refer to image 3 , shows a functional block diagram 300 of a second embodiment of a constant current driver according to the present invention. This embodiment and figure 2 The first embodiment differs only in the structure of the current detection circuit 103 . Wherein, the current detection circuit 103 of the constant current driver includes a low dropout regulator, wherein the low dropout regulator includes a low dropout regulator error amplifier 304 , an adjustment transistor 306 and a second resistor 302 . If it can be ensured that the low dropout regulator does not enter the linear region (dropout), then the reference voltage VR1 of the low dropout regulator itself and the second resistor 302 jointly set the load current Iout flowing through the load circuit 102 . In order to ensure that the low dropout regulator never enters the linear region (dropout) state, the current detection circuit 103 will feed back the feedback signal VFB that can reflect the working...

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Abstract

The invention relates to a constant current driver and a control method thereof. The constant current driver comprises a voltage source for providing an input voltage, a load circuit, a switch control circuit and a current detection circuit, wherein the current detection circuit is used for setting and detecting load current flowing through the load circuit, and the switch control circuit is used for receiving a feedback signal of the current detection circuit and adjusting the feedback signal so as to enable the feedback signal to be associated to a reference voltage.

Description

technical field [0001] The invention relates to a constant current driver, in particular to a control circuit of the constant current driver and a control method thereof. Background technique [0002] At present, there are two main types of constant current drivers in the industry. One is a switch type constant current driver, which has the advantage of achieving higher efficiency in the entire voltage application range and can output larger power; the disadvantage is that it needs magnetic components such as inductors and transformers, which has higher cost and larger EMI (Electromagnetic Interference), need to occupy a large board-level area. The other type is the linear constant current driver, which has the advantages of not needing to use magnetic components such as inductors and transformers, low cost, no EMI, and small board-level area; the disadvantage is that it is difficult to achieve high efficiency in the entire voltage application range, and it is very difficul...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 郑儒富
Owner 郑儒富