Title:
STEP-UP SWITCHING POWER SUPPLY
Document Type and Number:
Japanese Patent JP3939587
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a step-up switching power supply which is prevented from burning when a load is short-circuited or under an overload state.
SOLUTION: When the load is short-circuited or under an overload state, a switch element is forced to effect a constant current function and its detection output is fed back to an auxiliary switching element thus stopping the switching of a main switching element. Since the switching power supply loses a step-up function, power loss can be minimized. Similarly, the step-up function can be stopped by feed back to a PWM controller. When the overload state is released, the stopping state due to the feed back is released and a normal operation is resumed.
Inventors:
Tetsushi Otake
Application Number:
JP2002135310A
Publication Date:
July 04, 2007
Filing Date:
May 10, 2002
Export Citation:
Assignee:
Toko Co., Ltd.
International Classes:
H02M3/155; H02M3/156; (IPC1-7): H02M3/155
Domestic Patent References:
| JP2001136734A | ||||
| JP57110077A | ||||
| JP10210735A |
Previous Patent: FORWARD SECURE ELECTRONIC SIGNATURE METHOD, APPARATUS THEREFOR, PROGRAM AND RECORDING MEDIUM THEREFO...
Next Patent: SEWING MACHINE
Next Patent: SEWING MACHINE