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DC-AC transformer and controller IC thereof

A conversion device and transformer technology, applied in the direction of converting DC power input to DC power output, output power conversion device, and irreversible DC power input converting to AC power output, etc. Light range expansion, etc.

Inactive Publication Date: 2004-07-07
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to extend the dimming range of the load CCFL to the lower limit direction
[0016] In the inverter of Patent Document 3, the time ratio of lighting (ON) / extinguishing (OFF) of intermittent operation is controlled, but it is difficult to perform fine dimming only by intermittent operation

Method used

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  • DC-AC transformer and controller IC thereof
  • DC-AC transformer and controller IC thereof
  • DC-AC transformer and controller IC thereof

Examples

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Embodiment Construction

[0040] Embodiments of an inverter for generating an AC voltage for driving a load from a DC power source and a controller IC thereof according to the present invention will be described below with reference to the accompanying drawings.

[0041] figure 1 It is a figure showing the overall structure of the inverter of the embodiment of the present invention that uses an insulating transformer and a full bridge (H bridge) switching circuit to perform PWM control, figure 2 It is a diagram showing the internal configuration of a controller IC for inverter control.

[0042] figure 1 Among them, a P-type MOSFET (hereinafter referred to as PMOS) 101 as the first switch and an N-type MOSFET (hereinafter referred to as NMOS) 102 as the second switch form a current path flowing in the first direction to the primary winding 105 of the transformer TR. A current path in the second direction flowing to the primary winding 105 of the transformer TR is formed by the PMOS 103 as the third s...

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PUM

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Abstract

A constant current control is performed by PWM, and an analog burst control and a digital burst control are made selectable. The burst controls are selected in the following manner. A capacitor is selected as an element which is to be connected to a triangular signal oscillator circuit, to generate a triangular signal, thereby setting the analog burst control. A resistor is selected as the element to generate a constant voltage, thereby setting the digital burst control. A controller IC is used commonly in both the burst controls.

Description

technical field [0001] The present invention relates to a DC-AC conversion device (hereinafter referred to as an inverter) for generating an AC voltage for driving a load from a DC power source such as a power adapter or a battery attached to electrical equipment, and to a controller IC thereof. Background technique [0002] Cold-cathode fluorescent lamps (CCFLs) are used as a backlight light source for liquid crystal displays such as liquid crystal monitors of notebook computers and liquid crystal television receivers. The CCFL has substantially the same high efficiency and long life as a general hot cathode fluorescent lamp, and saves the filament that the hot cathode fluorescent lamp has. [0003] In order to start and operate the CCFL, a high AC voltage is required. For example, the starting voltage is about 1000V (effective value; the same applies to the AC voltage below), and the operating voltage is about 600V. This high AC voltage is generated from a DC power sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/337H02M7/48H05B41/282H05B41/392
CPCH05B41/3927H05B41/2828Y02B20/186H02M3/3376Y02B20/00H02M7/48H02M7/53846H02M3/155
Inventor 福本宪一
Owner ROHM CO LTD
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