A linear constant current drive circuit with dual voltage operation and its drive method
A linear constant current drive, dual voltage technology, applied in the direction of lamp circuit layout, electric light source, lighting devices, etc., can solve the problems of LED light-emitting tube brightness can not be guaranteed, low efficiency, etc.
Active Publication Date: 2016-07-27
SHANGHAI LOOALL ELECTRONICS CO LTD
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Problems solved by technology
The disadvantage of this circuit is: if the voltage of the LED is designed according to the 12V battery, such as 10V, then it is not suitable for the application of 24V battery power supply, because the efficiency will be very low
The disadvantage of this drive circuit is: if the voltage of the LED is designed according to the 110vac grid, such as 130V, then it is not suitable for the occasion of 220vac grid power supply, because the efficiency will be very low
Conversely, if the voltage of the LED is designed according to the 220vac grid power supply, such as 260V, then the 110vac grid voltage cannot be used for power supply, because the brightness of the LED light-emitting tube cannot be guaranteed.
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[0027] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0028] image 3 is the circuit block diagram of the present invention, image 3 It includes a first LED302, a second LED303, a diode 304, a current source 305 and a series-parallel switching circuit 301; the anode of the first LED302 is connected to the positive pole of the power supply Vin, the cathode is connected to the anode of the diode 304, and the cathode of the diode 304 is connected to the first The anode of the second LED303, the cathode of the second LED303 is connected to one end of the current source 305, the other end of the current source 305 is connected to the negative pole of the power supply Vin, the series-parallel switching circuit 301 has four terminals, wherein the first terminal and the second terminal It is connected to b...
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The invention discloses a linear constant-current driving circuit capable of running under two kinds of voltage and a driving method thereof. The linear constant-current driving circuit comprises a first LED, a second LED, a diode, a current source and a serial-parallel connection switching circuit. The anode of the first LED is connected with the positive pole of a power source, the cathode of the first LED is connected with the anode of the diode, the cathode of the diode is connected to the anode of the second LED, the cathode of the second LED is connected with one end of the current source, and the other end of the current source is connected to the negative pole of the power source. The serial-parallel connection switching circuit is provided with four terminals which are used for being connected with the two ends of the power source and the two ends of the diode respectively. When the power supply voltage is high, the serial-parallel connection switching circuit controls the electrical connection relationship between the first LED and the second LED to be serial connection; when the power supply voltage is low, the serial-parallel connection switching circuit controls the electrical connection relationship between the first LED and the second LED to be parallel connection.
Description
technical field [0001] The invention relates to the field of power supply circuits, in particular to a dual-voltage linear constant current drive circuit and a drive method thereof. Background technique [0002] At present, LED lighting is developing rapidly because of its advantages of energy saving, environmental protection, long life and good control. LED decoration and LED lighting have been widely used in various fields. The power supply of the LED lighting device is mainly based on AC mains and DC battery. There are two modes in the design of the LED drive circuit: one is to design a constant current output power supply with high-frequency switching mode. Under the condition of reasonable design, the high-frequency The switch mode constant current drive can take into account the power supply voltage of the global 110 / 220Vac two types of grids, or the supply voltage of different numbers of batteries connected in series. The disadvantage is that the circuit is complicate...
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IPC IPC(8): H05B37/02
Inventor 邵蕴奇
Owner SHANGHAI LOOALL ELECTRONICS CO LTD