JPH0232758A - Insulated type feeder circuit - Google Patents

Abstract

PURPOSE:To miniaturize an apparatus by charging one capacitor with an input power at the change-over contact of a relay and by causing the other capacitor to discharge said input power into a load. CONSTITUTION:An insulated type feeder circuit is composed of first to third relays 3a to 3c having two sets of change-over contacts, first to third capacitors 1a to 1c connected between the common contacts of said relay 3 and external current-blocking diodes 2a to 2c, and connected with a load from an output terminal 5. Also, two sets of common contacts of said relays 3a to 3c are successively connected with contacts on the input terminal 4 side so that capacitors 1a to 1c are charged with electricity from a power supply. Then, said common contacts of the relays 3a to 3c are successively changed over to contacts on the output terminal 5 side to start the discharge of said capacitors 1a to 1c to output power. Thus, power can be supplied in a state where said feeder circuit is isolated from an electric power supply equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an isolated power supply circuit, and particularly to an isolated power supply circuit that is isolated from a power supply device and supplies power to other devices.

[Conventional technology]

Conventional isolated power supply circuits use dedicated DC-
It was provided for each device that supplies DC converter power or AC-DC converter power.

[Problem to be solved by the invention]

In the conventional isolated power supply circuit described above, a large proportion of the dedicated power supply is connected to the supply device, which is a problem in miniaturizing the device. In addition, it is expensive, and the conversion efficiency of the power source is usually about 50%, which means that it consumes a lot of power.

[Means to solve the problem]

The isolated power supply circuit of the present invention includes at least two first and second relays each having two sets of switching contacts, an input terminal of a power source connected to one contact of the relay, and
a load-side output terminal connected to the other contact of the relay via a diode; first and second capacitors connected to a common contact with which one and the other contacts of the relay contact; and means for alternately operating the second relays.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. First, second and third relays 3a, 3b having two sets of switching contacts
, 3c and the first contact connected between the common contact of this relay.
and second and third capacitors la, lb, and lc, each contact on one side is connected to the input terminal 4 on the power supply side, and each contact on the other side is connected to the input terminal 4 on the load side via reverse current blocking diodes 2a, 2b, 2c. Connected to output terminal 5.

Next, the operation of this embodiment will be explained with reference to the time chart of FIG.

At time t1, the two sets of common contacts of the relay 3a are connected to the contacts on the input terminal 4 side, and the capacitor 1a is charged from the power source. At time t2, the common contact of the relay 3a switches to the contact on the output terminal 5 side, the common contact of the relay 3b switches to the contact on the input terminal 4 side, and the capacitor 1a starts discharging.
Capacitor 1b starts charging.

At the next time t3, the common contact of relay 3b is connected to output terminal 5.
The common contact of the relay 30 is switched to the contact on the input terminal 4 side, and the capacitor 1c starts charging. At this time capacitor 1a
remains in a discharged state.

At the next time t4, the common contact of the relay 3c is the output terminal 5.
The common contact of the relay 3a is switched to the contact on the input terminal 4 side, and the capacitor 1c starts discharging.The common contact of the relay 3a is switched to the contact on the input terminal 4 side, and the capacitor 1a starts charging again. At this time, the capacitor 1b maintains a discharged state.

In this way, by keeping one of the three capacitors in a charging state and two in a discharging state, stable power can be output to the output terminal 5, and it is also insulated from the input terminal 4 on the power supply side. be able to.

〔Effect of the invention〕

As described above, the present invention can supply power while being isolated from the power supply device by charging one capacitor of the input power source using the switching contact of the relay and discharging the other capacitor to the load. Furthermore, since the number of constituent parts can be reduced, this has the effect of contributing to miniaturization of the device and reduction in power consumption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a time chart for explaining the operation of this embodiment. 1 a, 1 b, 1 c・-capacitor, 2a
, 2b. 2C... Backflow blocking diode, 3a, 3b, 3c.
...Relay switching contact, 4...Input terminal, 5...Output terminal. Month 1 ward

Claims (1)

[Claims] at least two first and second relays having two sets of switching contacts, an input terminal of a power source connected to one contact of the relay, and a diode connected to the other contact of the relay; first and second contacts connected to the output terminal on the load side and a common contact that is in contact with one contact and the other contact of the relay;
An isolated power supply circuit comprising: a capacitor; and means for alternately operating the first and second relays.