JP2009100499A5

JP2009100499A5 -

Info

Publication number: JP2009100499A5
Application number: JP2007267339A
Authority: JP
Filing date: 2007-10-15
Publication date: 2010-07-08
Anticipated expiration: 2027-10-15

Claims

DC power supply comprising: a rectifier circuit connected to an AC power supply; a reactor connected to an input side or an output side of the rectifier circuit; and a switching element that performs an on / off operation to switch energy storage and discharge with respect to the reactor. A device,
Period setting means for setting a first period, which is a period for accumulating energy for the reactor, based on a zero cross point of the voltage of the AC power supply according to a load state of the DC power supply device;
When the load of the DC power supply device is equal to or higher than a preset first threshold value, the switching element is set to two or more preset timings at a preset preset timing within a first period set by the period setting means. Supply instruction means for outputting an instruction signal to the switching element so as to be turned on for a predetermined number of times set;
An on period setting means for setting an on period, which is a period for turning on the switching element a predetermined number of times, to an on period shorter than the previously set on period in the first period;
With
The supply instructing means outputs an instruction signal to the switching element so as to turn on the switching element only for the predetermined number of on periods set by the on period setting means. Power supply.

Start time setting means for setting the start timing of the on period for the predetermined number of times for each predetermined period starting from the start point of the first period;
The said supply instruction | indication means outputs an instruction | indication signal with respect to the said switching element so that the said switching element may be turned on by the start timing set by the said start time setting means. DC power supply.

The period setting means is included in the latter half part between adjacent zero-cross points in addition to the first period when the load of the DC power supply device is preset and equal to or greater than a second threshold value that is greater than the first threshold value. Setting a second period, which is a period for accumulating energy for the reactor,
The on-period setting means sets an on-period that is a period during which the switching element is in an on-state within the set second period when the second period is set by the period setting means. The DC power supply device according to claim 1 or 2 .

Current detecting means for detecting a current flowing through the reactor;
Phase determination means for determining whether or not the current detected by the current detection means is in phase with respect to the voltage supplied from the AC power supply;
With
The period setting means is included in the second half part between adjacent zero cross points in addition to the first period when the phase determination means determines that the phase is advanced, and accumulates energy for the reactor. Set the second period, which is the period,
The on-period setting means sets an on-period that is a period during which the switching element is in an on-state within the set second period when the second period is set by the period setting means. The DC power supply device according to any one of claims 1 to 3 .