Virtual ground type high-voltage constant-current circuit
A high-voltage constant current circuit technology, applied in the direction of lamp circuit layout, electric light source, overcurrent protection, etc., can solve the problems of not being able to meet the wide voltage output and the narrow working voltage range of the constant current circuit, and achieve output short circuit The effect of sensitive protection, good controllability and strong practicability
Active Publication Date: 2013-10-16
MOSO POWER SUPPLY TECH
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[0003] In view of the above-mentioned shortcoming that the working voltage range of the constant current circuit in the prior art is narrow and cannot meet the requirements of wide voltage output, the present invention provides a new virtual ground high-voltage constant current circuit, which utilizes the virtual ground structure way, combined with conventional topological circuits, to increase the range of operating voltage
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[0020] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.
[0021] Please see attached figure 1 And attached figure 2 , the present invention mainly includes a floating ground module, a switch constant current module, a current sampling module and a short circuit protection module, the power input floating ground module outputs to the switch constant current module, and a floating ground output is generated in the floating ground module, and the switching constant current module adjusts The power supply voltage is large and output to supply power to the load. The current sampling module is connected to the input terminal of the switch constant current module to sample the output current of the switch constant current module, and the current sampling value is fed back to the switch constant current module....
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The invention discloses a virtual ground type high-voltage constant-current circuit which comprises a floating module, a switch constant current module, a current sampling module and a short-circuit protection module, wherein the power is input to the floating module and output to the switch constant current module, floating output is generated in the floating module, the switch constant current module adjusts the voltage of a power supply which is output to supply power for a load, the current sampling module is connected on the output end of the switch constant current module, samples the output current of the switch constant current module, and feeds the current sampling valve to the switch constant current module, the short-circuit protection module is connected on the input end of the load, and the grounded end of the switch constant current module is connected on the floating output. In the invention, the virtual ground structural form is utilized, and a conventional topological circuit is combined so as to enlarge the range of the working voltage; and the anode of the voltage of the input power supply is taken as criterion, so that current sampling can only be conducted at the anode of the power supply, and the virtual ground type high-voltage constant-current circuit has high practical applicability, high efficiency and good controllability.
Description
technical field [0001] The invention discloses a constant current circuit, in particular to a virtual ground high voltage constant current circuit. Background technique [0002] With the development of LED lighting technology, LED lighting is used more and more in people's life. The current LED lights are driven by constant current circuits. The operating voltage range of the current constant current circuit is relatively narrow, which cannot meet the requirements of wide voltage output. Contents of the invention [0003] In view of the above-mentioned shortcoming that the working voltage range of the constant current circuit in the prior art is narrow and cannot meet the requirements of wide voltage output, the present invention provides a new virtual ground high-voltage constant current circuit, which utilizes the virtual ground structure way, combined with conventional topological circuits, to increase the range of operating voltage. [0004] The technical sol...
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IPC IPC(8): H05B37/02H02H3/08
Inventor 顾永德苏周董洁徐兵
Owner MOSO POWER SUPPLY TECH