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Ac adaptor

A technology of AC adapter and current value, which is applied in current collectors, conversion equipment with intermediate conversion to AC, battery overcurrent protection, etc. It can solve the problems of miniaturization and cost reduction without AC adapter, and the influence of electronic machines.

Inactive Publication Date: 2008-03-12
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the above restrictions, temporarily shortening the delay constant current control period may affect the operation of electronic equipment.
[0006] In addition, in the above-mentioned Japanese Patent Laid-Open No. 8-223907, the voltage in the region where the inrush current is generated in the electronic device is set higher than the voltage in the battery charging region, so in the thermal design when maintaining the maximum state of the DC output, Large-capacity elements that allow high power are required, and there is no effect of miniaturization and cost reduction of AC adapters

Method used

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Experimental program
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no. 1 Embodiment approach

[0019] FIG. 1 is a block diagram most preferably showing the structure of the AC adapter of this embodiment.

[0020] In Figure 1, 1 is the AC adapter, 2 is the AC input part, 3 is the primary filter circuit, 4 is the primary rectification circuit, 5 is the switching transformer, 6 is the oscillation control circuit, 7 is the photocoupler, and 8 is the secondary rectification circuit. Circuit 9 is a secondary filter circuit, 10 is a DC output unit, 11 is a regulator, and 12 is a low voltage detection circuit.

[0021] In addition, 13 is an operational amplifier, 14 is a gain regulator for adjusting the output voltage, 15 is a resistor for dividing the output voltage, 16 is a resistor for detecting the output current, 17 and 18 are resistors for adjusting the output current, 19 20 is a resistor for changing the constant current control value when the output voltage is lower than the value set by the low voltage detection circuit, 21 is a switch for changing the constant current...

no. 2 Embodiment approach

[0039] Fig. 4 shows a second embodiment of the present invention, and is a block diagram showing a configuration example of an AC adapter.

[0040] In FIG. 4 , reference numerals 1 to 24 are the same as those used in FIG. 1 . In FIG. 4, 25 is a temperature detection element, and 26 is a switch. Normally, the above-mentioned switch 26 is in an on state.

[0041]However, when the set value of the constant current is fixed at the second current value for a certain period of time or longer due to an abnormality of the electronic device 24, the internal temperature of the AC adapter 1 rises. Then, when the temperature detection element 25 detects that the preset temperature has been reached, the temperature detection element 25 makes the switch 26 non-conductive. Thereby, the setting value of the constant current is set to the above-mentioned first value, and the internal temperature is lowered.

[0042] By performing such control, it is possible to provide the AC adapter 1 that...

no. 3 Embodiment approach

[0044] Fig. 5 shows a third embodiment of the present invention, and is a block diagram showing a configuration example of an AC adapter. In FIG. 5 , reference numerals 1 to 24 are the same as those used in FIG. 1 .

[0045] In FIG. 5, 27 is a timing circuit. The timer circuit 27 is activated after the setting value of the constant current is set to the second current value due to the inrush current generated in the electronic device 24 . Then, when the inrush current continues for a predetermined time or longer, the timer circuit 27 makes the switch 26 non-conductive. By performing such control, the set value of the constant current is set to the above-mentioned first value.

[0046] As described above, by providing the timing means for measuring the rush current output time of the electronic equipment, it is possible to provide the AC adapter 1 that can safely shut down even when the electronic equipment 24 is abnormal.

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Abstract

It is an object of this invention to provide an AC adaptor capable of achieving downsizing and cost reduction, and having both a constant-voltage / constant-current control function necessary for battery charge, and an optimum current control function for driving of a low-power-consumption electronic apparatus. This AC adaptor includes a first constant-current control device which performs first constant-current control for charging a battery, a second constant-current control device which performs second constant-current control for supplying an electric current necessary to drive an electronic apparatus, and a voltage detecting device which detects the voltage drop of a DC output. If the output voltage becomes lower than a preset value, the second constant-current control for supplying the electric current necessary to drive the electronic apparatus is performed. Since this obviates the need for a large-capacity element which permits high power, it is possible to decrease the outer dimensions, and also decrease the power ratings of electronic parts.

Description

technical field [0001] The present invention relates to an AC (alternating current) adapter, and more particularly to an AC adapter that performs output under constant voltage / constant current control for charging a battery. Background technique [0002] In the past, the relationship between this kind of AC adapter and electronic equipment generally adopts the following method: make the AC adapter have constant voltage / constant current characteristics suitable for battery charging, and when driving electronic equipment, temporarily delay the constant current control to cope with electronic equipment. Inrush currents generated in machines. [0003] For example, as disclosed in (Japanese) Unexamined Patent Publication No. 8-223907, a built-in charge control device that performs constant voltage / constant current control built into an electronic device has been proposed. [0004] However, in such a power supply system, it is difficult to deal with rush current and control tempo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/04H02J7/10H02J7/00H02J7/06H02M3/28
CPCH02J2007/0039H02J7/06H02J7/0031Y02B40/90H02J7/041H02J2007/0037H02J7/045H02J7/00304H02J7/0071H02J7/00302Y02B40/00H02J7/04H02J7/00714H02J7/007182
Inventor 林勇生
Owner CANON KK
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