Low-power-consumption constant current control circuit and television
A technology of constant current control circuit and linear constant current circuit, which is applied in the field of TV, and can solve the problems of device cost increase, voltage error, cost increase, etc.
Active Publication Date: 2014-12-24
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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Problems solved by technology
When the linear constant current circuit works, the voltage at both ends of the switching tube will be due to the voltage error of the LED light string (generally, the range of a single LED is 2.8 to 3.4, due to the series connection of multiple LED lights, the difference between the upper limit and the lower limit of the voltage range of the LED light string will be relatively large), due to the influence of the intermodulation of the transformer (the general range is 7%), the higher the voltage, the greater the power consumption, which will cause the cost of the device to increase and the circuit efficiency to decrease
In addition, in order to reduce the temperature of the switching tube, the general switching tube will be used in parallel with multiple mos tubes or triodes, which leads to an increase in cost
Method used
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0051] see figure 2 , is a structural schematic diagram of an embodiment of the low power consumption constant current control circuit provided by the present invention.
[0052] In this embodiment, the low power consumption constant current control circuit includes a front-end power supply circuit 101 and a back-end linear constant current circuit 103 .
[0053] The front-end power supply circuit 101 includes a power supply circuit 1011, a first power supply output terminal OUT1, a second power supply output terminal OUT2 and a feedback adjustment circuit 1012;
[0054] Wherein, the feedback adjustment circuit 1012 includes a feedback input terminal A_in, a control signal input terminal Cont and a feedback signal output terminal B_out; the feedback input terminal A_in is co...
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The invention discloses a low-power-consumption constant current control circuit. The low-power-consumption constant current control circuit comprises a front-end power source circuit and a rear-end linear constant current circuit, wherein the front-end power source circuit comprises a power supply circuit and a feedback adjustment circuit, the power supply circuit comprises a first power supply output end, a second power supply output end and a feedback control end, the feedback adjustment circuit comprises a feedback input end, a control signal input end and a feedback signal output end, the feedback input end is connected with the second power supply output end, and the feedback signal output end is connected with the power supply circuit; the rear-end linear constant current circuit comprises a comparison adjustment circuit and a constant current control circuit. A voltage collecting output end is led out of the connecting position of the constant current control circuit and an LED light string to be powered on to collect the voltage of the connecting position, the voltage value of the control signal input end is adjusted according to the collecting result, and therefore the output voltage of the first power supply output end and the second power supply output end is adjusted.
Description
technical field [0001] The invention relates to the technical field of power supply control, in particular to a low power consumption constant current control circuit and a television set with the low power consumption constant current control circuit. Background technique [0002] The linear constant current modulation circuit is a unit circuit widely used in analog integrated circuits, and has a wide range of applications in practice. Among them, in the field of power control technology of LED TVs, the front-end circuit is often used to output a constant voltage, and the back-end circuit is used to realize step-up or step-down constant current to realize power supply to the main board of the TV set and the LED backlight. [0003] In the process of integrating TV components, TV motherboards and backlight strips usually need to be produced together, and different numbers of backlight LED strips will require linear constant current modulation circuits to adaptively output dif...
Claims
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Inventor 吴永芳刘威河廖武杨达富
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD