JPH03289356A - Power supply - Google Patents

Abstract

PURPOSE:To make it possible to take out voltages having different polarities from common output terminals by connecting first and second rectifiers such that the output from one rectifier has a common potential whereas the output from the other rectifier has a reverse polarity voltage, and providing a limiting element for preventing flow-in of the other rectified output in series with each output winding. CONSTITUTION:First and second output transformers 1, 2 are provided independently and fed with power, respectively, with different timings. A negative voltage with respect to a common potential is obtained when the first output transformer 1 is fed with power, whereas a positive voltage is obtained when the second transformer 2 is fed with power. In any case, flow-in of power from the other unit to the output winding is prevented by means of limiting elements 7, 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a power supply device capable of obtaining voltages of different polarities from a common output terminal.

(Prior Art) For example, in a 1B photocopier, a voltage of a specific polarity is required for charging, neutralizing, biasing, etc. Conventionally,
To meet such requirements, electric currents of different polarities are used.
It was equipped with a power supply device capable of outputting 11, and the output timing was controlled by Monologue.

(Issues to be Solved by the Invention) However, in the conventional system, the output control timing is complicated and the control system is expensive. Also,
When it is required to apply voltages of different polarities to a common load at different timings, it is difficult to cope with the above-mentioned conventional devices. Therefore, a particularly complex power supply was required.

The present invention has been made to solve these conventional problems, and it is an object of the present invention to provide a power supply device that can easily and inexpensively obtain voltages of different polarities from a common output terminal.

[Structure of the Invention] (Example) An example of the present invention will be described below with reference to the drawings. 1 is a first output transformer, 2 is a second output transformer,
Each of them is independent, and inputs are supplied to each of them at different timings. The input may be a high frequency voltage or a low frequency voltage. 3 is a first rectifier;
Reference numeral 4 denotes a second rectifier, which in this embodiment each has a smoothing capacitor 5.6. These first. One output of the rectifier 3.4 made of brass 2 is set to conductive potential, and the other outputs are connected to each other. 7 and 8 are limiting elements such as constant voltage elements and impedance elements, and the other output This prevents the material from becoming clogged with water.

In this embodiment, when human power is supplied to the first output transformer l, a negative voltage is obtained with respect to the common potential,
When the second output transformer 2 is supplied with human power, a positive voltage is obtained with respect to the common potential. In either case, the restricting device 7.8 can prevent the other output from flowing into the output winding.

[Effects of the Invention] As described above, according to the present invention, voltages of different polarities can be obtained from a common terminal, although the configuration is simple.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. 1...First output transformer. 2... Second output transformer, 7, 8... Limiting element.

Claims (1)

[Claims] (1) First and second output transformers that are independent of each other and supplied with input at different timings; rectified outputs that are provided on the output side of each of the first and second output transformers and have mutually opposite polarities. first and second rectifiers that generate; and one output of each of the first and second rectifiers is set to a common potential, and the other output of each is configured to obtain a voltage of opposite polarity. A power supply device comprising a limiting element connected to each other and in series with each output winding to prevent circuitry caused by the rectified output of the other.