A real-time regulated constant current source circuit and its constant current control method
A real-time control, constant current source technology, applied in the power supply field, can solve the problems of limited equipment space, limited radiator volume, different load currents, etc., to achieve reliable performance, real-time automatic constant current control, and fast response.
Active Publication Date: 2017-03-29
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology
In system applications, the limited equipment space leads to the limited volume of the radiator
In addition, when multiple loads are connected, the load LEDs or LDs have individual differences, resulting in different load currents.
Method used
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[0028] Such as figure 1 As shown, the real-time regulated constant current source circuit of the present invention includes a control module 100 , a boost module 200 , an amplification module 300 , a feedback module 400 and a load 500 .
[0029] In this example, the main control module 100 is an MCU, including functions such as a tunable PWM wave generator, analog-to-digital conversion, and digital-to-analog conversion.
[0030] In this example, the boost module 200 includes a boost circuit, a first resistor R201 and a second resistor R202. The boost circuit is connected to the PWM wave output port of the control module 100, and the output end is connected to the constant current source to output positive pole. One end of the first resistor R201 is connected to the output of the boost circuit, one end is connected to the second resistor R202 , and at the same time is connected to the analog-to-digital conversion input port of the main control module 100 . The other end of th...
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The invention relates to the technology of power supplies and aims at solving the problems that for an existing constant current source output current, the response is slow, and all load currents are different when the loads are more. The invention provides a constant current source circuit capable of being regulated and controlled in real time. The constant current source circuit comprises a control module, a voltage boosting module, an amplifying module and a feedback module, the control module is connected with the voltage boosting module, the amplifying module and the feedback module, the voltage boosting module comprises a voltage boosting circuit and a voltage protection circuit, and the amplifying module comprises an amplifying circuit, a power triode and a current detecting circuit; the voltage boosting circuit is connected with the control module and the voltage protection circuit, the voltage protection circuit is connected with the control module, the amplifying circuit is connected with the control module and a B electrode of the power triode, an E electrode of the power triode is connected with the current detecting circuit, the C electrode output is a constant current source output negative electrode, the output of the voltage boosting circuit is a constant current source output positive electrode, the current detecting circuit is connected with the control module, and the feedback module is connected with the power supply output negative electrode and the control module. The constant current source circuit capable of being regulated and controlled in real time is suitable for constant current sources.
Description
technical field [0001] The invention relates to power supply technology, in particular to a constant current source circuit that can be regulated in real time. Background technique [0002] Constant current sources have been widely used in optoelectronics, aerospace, communications, medical and other fields, especially in LED drive and laser drive. [0003] When the output of the voltage adjustable constant current source changes from one current value to another, the normal output of the current is ensured by adjusting the voltage. However, the slow voltage change speed results in slow output current response. [0004] The constant voltage type constant current source outputs a higher voltage to ensure a large current output range and fast response. However, too much power supply energy is consumed on the power transistor, which wastes energy and generates a lot of heat. [0005] When the constant current source is used to drive LED projection and laser projection light ...
Claims
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 蔡静马赛
Owner SICHUAN CHANGHONG ELECTRIC CO LTD