A stabilized power supply circuit and liquid crystal display device
A stabilized power supply circuit and liquid crystal display device technology, applied to static indicators, instruments, etc., can solve problems such as high cost, abnormal voltage, abnormal display of liquid crystal display panels, etc., and achieve the effect of low cost
Active Publication Date: 2018-07-06
KUSN INFOVISION OPTOELECTRONICS
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Problems solved by technology
[0003] When the liquid crystal display device is working, the power supply circuit provides the necessary voltage for the driving circuit of the liquid crystal display panel, and the working voltage of the power supply circuit has a certain range (taking G5517 as an example, the range of its working voltage in the specification is 2.5V ~ 5.5V V), the power supply of the working voltage provided by the power supply circuit may be lower than the minimum value of this working voltage due to the surge in energy consumption of other system modules such as graphics card modules, audio modules, etc., which may cause abnormal voltage output from the power supply circuit to the drive circuit , which will cause the LCD panel to display abnormally
[0004] The existing technology generally replaces the chips in the existing power supply circuit with chips with wider working voltage, but this method is costly
Method used
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[0019] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0020] Although the present invention uses the terms first, second, third, etc. to describe various elements, signals, ports, components or sections, these elements, signals, ports, components or sections are not limited by these terms. These terms are only used to distinguish one element, signal, port, component or section from another element, signal, port, component or section. In the present invention, an element, port, component or part is "connected" or "connected" to another element, port, component or part, which can be understood as a direct electrical connection, or can also be understood as an indirect electrical connection with an intermediate element. sexual connection. Unless otherwise defined, all terms (including techn...
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The invention provides a voltage stabilizing power supply circuit comprising a boosting power supply and a voltage stabilizing module. The voltage stabilizing module comprises a second diode, a second capacitor, a third diode, a fourth diode, and a first resistor. The positive pole of the second diode is used to receive the DC input voltage, and the negative pole of the second diode is connected with a power supply input end of a first switch control unit. The second capacitor is connected between the negative pole of the second diode and the ground, and the positive pole of the third diode is grounded. The negative pole of the third diode is connected with the negative pole of the second diode, and the negative pole of the fourth diode is connected with the negative pole of the second diode. The first resistor is connected between the positive pole of the fourth diode and the first end of the first capacitor, and the clamp voltage of the third diode is greater than the minimum working voltage of the first switch control unit. The invention also provides a liquid crystal display device. By adopting the voltage stabilizing power supply circuit and the liquid crystal display device, the unstable output voltage phenomenon caused by the low DC input voltage can be prevented, and the costs are low.
Description
technical field [0001] The invention relates to a power supply circuit, in particular to a stabilized voltage power supply circuit and a liquid crystal display device. Background technique [0002] Liquid Crystal Display (LCD) has many advantages such as lightness, lightness, energy saving, and no radiation, so it has gradually replaced the traditional cathode ray tube (CRT) display. Currently, liquid crystal displays are widely used in high-definition digital televisions, desktop computers, personal digital assistants (PDAs), notebook computers, mobile phones, digital cameras and other electronic devices. [0003] When the liquid crystal display device is working, the power supply circuit provides the necessary voltage for the driving circuit of the liquid crystal display panel, and the working voltage of the power supply circuit has a certain range (taking G5517 as an example, the range of its working voltage in the specification is 2.5V ~ 5.5V V), the power supply of the...
Claims
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IPC IPC(8): G09G3/36
CPCG09G3/3696G09G2330/02
Inventor 张大雷阮永鑫
Owner KUSN INFOVISION OPTOELECTRONICS