Soft starting circuit and power supply device
A technology of soft start circuit and power supply device, which is applied in the direction of output power conversion device and electrical components, etc. It can solve the problems of excessive instantaneous current, power supply output voltage drop, impact, etc., and achieve the effect of reducing inrush current
Inactive Publication Date: 2017-04-19
KUSN INFOVISION OPTOELECTRONICS
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Problems solved by technology
[0004] The existence of surge current will affect the life of protective components such as fuses and affect the reliability of the power system
The surge current will also impact the components of the subsequent load, affecting the stability of the load system
Because the power of the power supply is limited, if the instantaneous current generated is too large, it will inevitably lead to a drop in the output voltage of the power supply, resulting in the downtime of the load system and even the downtime of the power system controller
Method used
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[0034] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0035] The invention can be embodied in various forms, some examples of which are described below.
[0036] image 3 A schematic diagram of a soft start circuit according to an embodiment of the present invention is shown. Such as image 3 As shown, the soft start circuit 20 is used to control the surge current, including a potentiometer VR, an operational amplifier OP and a field effect transistor Q1.
[0037] Wherein, the potentiometer VR is connected between the signal input terminal IN and the ground terminal GND.
[0038] In this embodiment, the potentiometer VR is a digital potentiometer DVR, the first terminal of the digital potentiometer DVR is connected to...
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The invention belongs to the field of display test, and discloses a soft starting circuit, which comprises a potentiometer, an operational amplifier and a field effect transistor, wherein the potentiometer is connected between a signal input end and a grounding end; the positive-phase input end of the operational amplifier is connected with the sliding end of the potentiometer, and the reverse-phase input end is connected with a signal output end; the gate of the field effect transistor is connected with the output end of the operational amplifier, the drain is connected with the signal input end, and the source is connected with the signal output end; and the sliding end of the potentiometer controls voltage at the positive-phase input end of the operational amplifier. The invention also discloses a power supply device. The power supply device comprises the above soft starting circuit. Through the digital potentiometer and the operational amplifier of the soft starting circuit, the field effect transistor is controlled to work in a variable resistance area, the voltage at the signal output end rises slowly, and power-on surge current can be greatly reduced.
Description
technical field [0001] The invention belongs to the field of display testing, and more specifically relates to a soft start circuit and a power supply device. Background technique [0002] At present, for most DC-DC switching power supplies, at the moment of starting up, a large current will be generated on its power supply bus, which is commonly referred to as inrush current. The generation of inrush current not only brings great instantaneous stress to the components in the circuit, causing damage to the components, but also produces damage to other electrical equipment (such as liquid crystal display panels and other loads) connected to the same power supply bus. Larger momentary disturbances. Therefore, it is very necessary to control the surge current of the DC-DC switching power supply. [0003] At present, in order to control the surge current, a soft-start circuit is often used at the front end of the energy storage element. figure 1 It is a circuit schematic diag...
Claims
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IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 郭晶晶周永超施骏赵麟瑄
Owner KUSN INFOVISION OPTOELECTRONICS