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Chopper regulator circuit

A regulator circuit and voltage technology, applied in the direction of instruments, electric light sources, electrical components, etc., can solve the problems of increasing the total number, hindering the miniaturization and cost reduction of chopper regulator devices

Inactive Publication Date: 2008-06-25
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, disadvantageously, providing components such as a power supply and a drive circuit dedicated to each load leads to an increase in the total number of required components, preventing miniaturization and cost reduction of devices including chopper regulators

Method used

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Examples

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Effect test

Embodiment 1

[0056] Embodiment 1: As a first embodiment of the present invention, a chopper connected to an LED group (which may be a single LED or a plurality of LEDs connected in series) and an organic EL element to selectively supply power to one of them will be described below. Regulator type power supply circuit. The configuration of this power supply circuit is shown in FIG. 1 .

[0057] As shown in FIG. 1, the power supply circuit includes a DC (direct current) power supply 1, an input capacitor 2, a coil 3, a first diode 4a, a second diode 4b, a first output capacitor 5, resistors 7 to 9, a first Two output capacitors 10, chopper regulator IC 31 and other components. Constructed as shown in FIG. 1 , the power supply circuit supplies electric power to the LED group 6 and the organic EL element 11 .

[0058] The negative terminal of the DC power supply 1 is grounded, while the positive terminal of the DC power supply 1 is connected to one end of the input capacitor 2 and one end of...

Embodiment 2

[0080] Embodiment 2: Next, as a second embodiment of the present invention, a power supply circuit will be described again below. The configuration here is largely the same as in Embodiment 1, the main difference being that a delay circuit is additionally provided. Therefore, overlapping descriptions will not be repeated.

[0081] FIG. 2 shows the configuration of the power supply circuit of this embodiment. As shown in the figure, in the chopper regulator IC 31, a delay circuit 23 is additionally provided between the switching control section 21 and the first switch 22a. The delay circuit 23 delays the switching signal output from the switching control section 21 by a predetermined time length to control switching of the first switch 22a, and then feeds the delayed switching signal to the first switch 22a.

[0082] Due to the delay circuit 23, even when the switching control section 21 outputs switching signals for switching the first to third switches 22a to 22c at the sam...

Embodiment 3

[0084] Embodiment 3: Next, as a third embodiment of the present invention, a power supply circuit will be described again below. The structure here is largely the same as that of Embodiment 1, and the main difference lies in the structure of the reference voltage circuit 19 . Therefore, overlapping descriptions will not be repeated.

[0085] FIG. 3 shows the structure of the power supply circuit of this embodiment. As shown, the reference voltage circuit 19 includes a reference voltage source 20, a resistor 38, a resistor 39, a third switch 22c and other components.

[0086] The reference voltage source 20 generates a predetermined reference voltage VREF, and its negative terminal is grounded. The positive terminal of the reference voltage source 20 is connected to one terminal of the resistor 38 and one terminal of the third switch 22c. The other end of the resistor 38 is grounded via a resistor 39 . The node between the resistors 38 and 39 is connected to the other end o...

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Abstract

A chopper regulator circuit has: a power output portion for a first and a second load; a first output detection portion detecting the output to the first load; a second output detection portion detecting the output to the second load; a first and a second reference voltage generation portion; an output control portion controlling the amount of outputted electric power based on a result of comparison between two input voltages; and a switching control portion switching which of the first and second loads to supply electric power to and switching what voltages to handle as the input voltages. The input voltages are so switched that, when electric power is supplied to the first load, the detected voltage detected by the first output detection portion and the reference voltage generated by the first reference voltage generation portion are handled as the input voltages and, when electric power is supplied to the second load, the detected voltage detected by the second output detection portion and the reference voltage generated by the second reference voltage generation portion are handled as the input voltages. Thus, a chopper regulator circuit is realized that can easily supply two loads with adequate electric power with minimum disadvantages such as an increase in the total number of components needed.

Description

technical field [0001] The present invention relates to chopper regulator circuits for powering multiple electrical loads. Background technique [0002] White LEDs (Light Emitting Diodes) are generally used as backlights for liquid crystal displays in mobile phones, mobile terminals, and the like. These white LEDs are typically driven by a step-up chopper regulator. On the other hand, organic EL (Electro Luminescence) elements are increasingly used in this display portion these days, contributing to thinning of the display portion. [0003] The white LEDs described above require a forward voltage as high as about 4V, and the forward voltage tends to be different from LED to LED. To improve the quality of liquid crystal displays, the backlight needs to produce consistent brightness. In mobile devices, most of which operate from batteries such as lithium-ion batteries, the brightness of each LED is made consistent by passing equal current through them, which is achieved by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07G09G3/32
CPCH02M2001/009H02M3/156H05B35/00Y10T307/461H02M1/009
Inventor 铃木友广
Owner SHARP KK
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