Electric power switching circuit and LCD device adopting the same
A technology of power switching and switching circuits, which is applied to static indicators, instruments, etc., can solve the problem of high cost of power switching circuits, and achieve the effect of realizing cost and reducing cost
Inactive Publication Date: 2009-06-10
INNOCOM TECH (SHENZHEN) CO LTD +1
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0007] In order to solve the problem of high cost of the power switching circuit in the prior art, it is necessary to provide a power switching circuit that can reduce the cost
Method used
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Embodiment Construction
[0018] see figure 2 , is a circuit diagram of the first embodiment of the power switching circuit of the present invention. The power switching circuit 200 includes a first input terminal 210 , a second input terminal 220 , a total output terminal 230 , a voltage adjustment circuit 240 , a voltage comparison switching circuit 250 and three filter circuits 270 .
[0019] The voltage regulation circuit 240 includes a first diode 241, a second diode 242, an input terminal 243 and an output terminal 244; the first diode 241 and the second diode 242 are PN junctions type diode; the anode of the first diode 241 is used as the input terminal 243 of the voltage adjustment circuit 240, its cathode is connected to the anode of the second diode 242, and the cathode of the second diode 242 is used as the voltage The output terminal 244 of the adjustment circuit 240 .
[0020] The voltage comparison switching circuit 250 includes a first transistor 251, a second transistor 252, a first ...
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The invention relates to a power supply switch circuit and a liquid crystal display device adopting the power supply switch circuit, which is characterized in that: the power supply switch circuit comprises a first input terminal, a second input terminal, a voltage adjusting circuit which adjusts the voltage utilizing a diode or a transistor, a voltage comparison switch circuit, and a general output terminal; wherein, the voltage comparison switch circuit comprises a number one input terminal, a number two input terminal and an output terminal; the number one input terminal of the voltage comparison switch circuit receives the first of signal of the first input terminal via the voltage adjusting circuit; the number two input terminal receives the second signal of the second input terminal; the output terminal is used as the general output terminal of the power supply switch circuit; the power supply switch circuit is adjusted and switched according to the first signal and the second signal and exports the corresponding voltage signal to the general output terminal.
Description
technical field [0001] The invention relates to a power switching circuit and a liquid crystal display device using the power switching circuit. Background technique [0002] At present, consumer electronic products, especially liquid crystal display devices, usually have two power supply voltages. In different working states, it is generally necessary to switch the energized circuit according to different power supply voltages, and adjust the voltage through the circuit. Output a required working voltage. For this reason, it is necessary to provide a power supply switching circuit to switch the energized circuit and adjust the voltage for different power supply voltages. [0003] see figure 1 , is a circuit diagram of a prior art power switching circuit. The power switching circuit 100 includes a first input terminal 110, a second input terminal 120, a first diode 150, a second diode 160, a DC-DC regulator 140 and a output terminal 130 . The DC-DC regulator 140 include...
Claims
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IPC IPC(8): G02F1/133G09G3/36
Inventor 屠家辉周通
Owner INNOCOM TECH (SHENZHEN) CO LTD