JPS59178961A - Power source - Google Patents

Abstract

PURPOSE:To suppress the generation of noise and to enable to simplify input and output side filters by connecting a plurality of voltage converters to one DC power source and one load circuit, and turning ON and OFF at the different positions. CONSTITUTION:A voltage converter having a transistor 2, an inductor 3 and a diode 4, and a voltage converter having a transistor 2', an inductor 3' and a diode 4' are connected between a DC power source 1 and a load 5. The transistors 2, 2' are driven in different phases of 180 deg. from each other. In this manner, the ON and OFF period of the voltage converter from the power source 1 and the load 5 becomes by one half of the case that the voltage converter is one system.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a power supply device used, for example, as a stabilized DC power supply or a DC discharge lamp lighting device.

(Background of the Invention) Conventionally, a device having the configuration shown in FIG. 1 has been known as a device for this building. In the figure, 1 is a DC α source, and AC Shima source 11
, a full-wave rectifier circuit 12 and a smoothing capacitor 13. Directly between the source 1, that is, the DC output terminals a and b of the rectifier circuit 12, a switching system is connected, for example, a series circuit of a transistor 2 and an inductor 3, and a series circuit of a transistor 2 and an inductor 3 is connected between both ends of the inductor 30. A load 5 is connected via a diode 4 placed opposite to the first current flowing through the transistor 2, and a smoothing capacitor 6 is connected in parallel with the load 5.

In this power supply device, the transistor 2 is turned on and off by a drive circuit (not shown), and current energy is applied to the inductor 3 from a direct current during the on period of the transistor 2, and current energy is applied to the inductor 3 from the inductor 30 during the off period of the transistor 2. The energy stored in the inductor 3 is released to the load 5 and the capacitor 6 by commutating the current to a series circuit consisting of the parallel circuit of the load 5 and the smoothing capacitor 6 and the diode 14. As a result, the load 5 is supplied with a DC voltage in which the polarity of the output '1 voltage of the DC 1 source 1 is inverted. In addition, by controlling the energy accumulated in the inductor 3 from the DC power source 1η1 by changing the on/off frequency or duty ratio of the transistor 20, the m force ('voltage,' ridge current or force) can be changed to It is possible to wholesale. Note that, in this power supply device for the shelf, for example, one in which the output voltage is female-regulated is known as a so-called switching regulator.

By the way, in such a power supply device, the direct σ11
There was a problem in that the noise caused by the direct current from the boiler was large, and when the equipment was made to have a large capacity, the noise generated increased according to the capacity.

(Object of the Invention) The present invention has been made in view of the problems in the conventional type described above, and an object of the present invention is to provide a power supply device that suppresses noise generation and is suitable for increasing the number of power supplies.

(Structure of the Invention) In order to achieve the above object, the present invention includes a DC power supply, a switching element, an inductor in which energy is stored from the DC source during the ON period of the switching element, and an OFF period of the switching element. In a power supply device comprising a diode that flows the stored energy of the inductor and supplies it to a load, a voltage conversion circuit consisting of the switching element, an inductor, and a diode is provided in a multi-power system, and each of the switching elements is different from each other. This power supply device is characterized by turning on and off depending on the phase.

(Explanation of Examples) Hereinafter, the present invention will be explained in detail using the drawings.

Note that parts common to or corresponding to those of the conventional example are designated by the same reference numerals.

FIG. 2 shows a circuit configuration of a one-source device according to an embodiment of the present invention. The power supply device shown in the figure is different from the one shown in FIG. 1, consisting of a transistor 2', an inductor 3' and a diode 4'. It is designed to drive with phases different by 180°. Therefore, the on/off period of the voltage conversion circuit as seen from the DC power supply 1 and the load 5 is half that of the conventional example (Fig. 1), the low current pulsations flowing through the DC power supply and the load are reduced, and each voltage conversion The current passing through the circuit is halved. Therefore, not only the miscellaneous liquid is reduced, but also the respective outputs of the smoothing capacitors 13 and 6 can be made smaller. Further, mt of the transistor, inductor, and diode may be 1/2.

In addition, in the above-mentioned embodiment, an example was explained using a voltage conversion circuit that generates four output voltages whose dust characteristics are inverted with respect to the input voltage. It is also possible to implement this using a voltage conversion circuit that generates an output voltage of the same polarity as the input screw voltage. Here, the lifting tray using the circuit of FIG. 3 generates an output paper pressure lower than the input voltage, and in the case of FIG. 4, output voltages both above and below the input voltage are generated.

(Effects of the Invention) As described above, according to the present invention, multiple systems of voltage conversion circuits are connected to one DC power supply and one load circuit, and are turned on (off) at different phases. The pulsation of the current becomes smaller, the generation of noise can be suppressed, and the human power S and the output side filter circuit can be simplified.

Roughly speaking, if the load is the same, the burden on each switching element S and diode will be 1/TL (where LE is the number of voltage conversion circuit systems), so it is better to use a more general-purpose element with a lower rating. , or by increasing the output of the power supply device, it becomes the 1jth power supply.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional power supply device, and Fig. 2 is a circuit diagram of a conventional power supply device.
The circuit diagrams of the power supply device according to the embodiment, FIGS. 3 and 4, are respectively circuit diagrams showing other examples of the pressure conversion circuit used in the present invention. 1... DC power supply, 2... Transistor,
3... Inductor, 4... Dio-P. 5...Load. Patent Applicant: Kasushiba Tunzai Co., Ltd. 1-Craftsman: JP Buried Officer Tatsuo Izuka Ito Takegaki Figure 1 Figure 2 Figure 14

Claims (1)

[Claims] 1. A DC source, a switching element, an inductor in which energy is stored from the DC power supply during the ON period of the switching system element, and a swivel switching element that stores energy during the ON period of the switching element. 2. In a power supply device equipped with a diode that rectifies the energy stored in the inductor and supplies it to the load, a 'torque pressure change circuit' consisting of the switching element, the inductor and the diode is provided with a handling system pile, and the valley switching A power supply device characterized by controlling on/off of each system element in different phases. 2. The power supply device according to claim 1, which has two systems of the 1-voltage conversion circuits, and turns on and off the switching elements in the valley-to-ridge pressure conversion circuits in phases 180 different from each other.