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Power-supply circuit and photoelectric apparatus

A technology of power circuit and comparison device, which is applied in optics, nonlinear optics, high-efficiency power electronic conversion, etc., and can solve problems such as high resistance difficulty, susceptibility to noise, unfavorable power circuit integration and miniaturization and simplification.

Inactive Publication Date: 2004-05-12
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, it is difficult to form a high resistance on an IC chip, or the size of the formation is large, so it is not conducive to the integration and miniaturization of the power supply circuit.
Furthermore, when the resistance values ​​of the resistors 420 and 422 are high, another problem of being easily affected by noise occurs.

Method used

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  • Power-supply circuit and photoelectric apparatus
  • Power-supply circuit and photoelectric apparatus
  • Power-supply circuit and photoelectric apparatus

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Experimental program
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Embodiment Construction

[0028] Embodiments of the present invention will be described below with reference to the drawings.

[0029]

[0030] First, a first embodiment of the present invention will be described. figure 1 It is a block diagram showing the structure of the power supply circuit of this embodiment. The figure shows the power supply circuit 450 with Figure 9 The conventional power supply circuit shown is different in that switches 462, 464, 466 and capacitors 472, 474 are newly provided. More specifically, in the power supply circuit 450, the switch 462 is inserted between one end of the capacitor 418 serving as an output terminal and the resistor 420, and the switch 464 is inserted between the ground line serving as the reference potential GND and the resistor 422. In addition, a switch 466 is inserted between the voltage dividing point E of the resistors 420 and 422 and the negative input terminal F of the comparator 424 . Further, a capacitor 472 is inserted between the point F and...

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PUM

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Abstract

The present invention seeks to minimize a current to be consumed by resistors, which cause a fraction of an output voltage to develop, in a power supply circuit. A power supply circuit 450 converts an input voltage Vin into an output voltage Vout and outputs the output voltage. The power supply circuit has resistive elements 420 and 422, switches 462 and 464, and capacitors 472 and 474. The resistive elements 420 and 422 cause a fraction of the output voltage Vout to develop. The switches 462 and 464 are turned on or off in order to enable or disable flow of a current through the resistive elements 420 and 422. When the switches 462 and 464 as well as a switch are turned on, the capacitors 472 and 474 hold the voltage at point E, which is the fraction of the output voltage Vout developed due to the resistive elements 420 and 422, at point F.

Description

technical field [0001] The present invention relates to a low-loss power supply circuit for supplying electric power and a power-saving electro-optical device for supplying electric power from the power supply circuit. Background technique [0002] First, a conventional power supply circuit, for example, a power supply circuit in which a high voltage Vout is generated from a low voltage Vin and supplied externally will be described. Figure 9 It is a block diagram showing the configuration of a conventional power supply circuit 400 . In the figure, the switch 412 is actually composed of a transistor, and the switch is turned on when the signal CTR as a gate signal is at H level. One end of the switch 412 is connected to a line to which Vin is applied via an inductor (coil) 414, and the other end is connected to a ground line serving as a reference potential GND. In addition, structurally, one end of the switch 412 is connected to one end of a capacitor 418 via a forward dio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G02F1/133G09G3/20H02M3/156
CPCH02M2001/0048H02M3/156Y02B70/1491H02M1/0048Y02B70/10
Inventor 矢田部聪
Owner BOE TECH GRP CO LTD