A LED current detection and control circuit and method thereof
A current detection and control circuit technology, applied in the direction of electric lamp circuit layout, measurement of current/voltage, energy-saving control technology, etc., to achieve high power factor value, fewer components, and avoid current difficulties.
Active Publication Date: 2016-02-10
SHENZHEN LINGQI SEMICON CO LTD
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Problems solved by technology
[0010] The technical problem to be solved by the present invention is to provide a non-isolated, equivalent Closed-loop control LED driving circuit, method and controller thereof
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[0043] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0044] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0045] Such as figure 1 , an embodiment of the LED current detection and control circuit in the present invention is as follows: including a controller 101, a switch tube 102, a transformer 103, a sampling resistor 104, a freewheeling diode 105, an input bridge rectifier 107, resistors 111 and 112 , Output filter capacitor 115 . The load in this embodiment is the LED lamp string 106 .
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The invention discloses a light emitting diode (LED) current detection and control circuit and a controller thereof, which relates to the field of the LED current detection and control circuit, and aims at providing a non-isolated equivalent closed-loop control LED drive circuit based on a buck topology and a controller thereof. The LED current detection and control circuit comprises a power supply, an energy storage element, a switch pipe and a controller; the power supply is used for powering a load when the switch pipe is conducted; the energy storage element is used for storing electric energy when the switch pipe is conducted and releasing the electric energy to power the load when the switch pipe is disconnected; the controller is used for controlling the switch pipe to be conducted or disconnected according to a feedback signal; and when the switch pipe is conducted, the feedback signal is a signal for reflecting the instantaneous current flowing by the load, and the feedback signal is a signal for reflecting the equivalent current flowing by the load when the switch pipe is disconnected.
Description
technical field [0001] The invention relates to the circuit field of LED current detection and control, in particular to an LED current detection and control circuit using buck topology (Buck) to output high-precision current in LED lighting. Background technique [0002] Traditional lighting technology has disadvantages such as low luminous efficiency, high power consumption, and short service life. LED lighting has the advantages of long life, energy saving, safety, and environmental protection, and is rapidly replacing traditional lighting. Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains, and require a constant output current provided by a current detection and control circuit. Current accuracy is one of the most important indicators of LED current detection and control circuits. Other indicators mainly include insulation reliability, volume size, power factor, conversion efficiency, power supply life, and electromagnetic compatibility....
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IPC IPC(8): H05B37/02G01R19/00G01R19/175
CPCY02B20/40
Inventor 蒋晓博
Owner SHENZHEN LINGQI SEMICON CO LTD