JPH06335251A - Time division type isolated power supply - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the number of secondary windings and output pin terminals of the transformer in the isolated power supply section, simplify the structure, and reduce the size and weight. A single insulated parent power supply unit 1 having a power transformer 11 whose primary side is connected to an AC power supply 2, and a plurality of switches SW connected in parallel to the secondary side of the power transformer 11.
A switching circuit 3 having _{1 to} SW ₄ and capacitors 43, 53, 6 whose both ends are connected to the output sides of these switches.
A plurality of individual power supply units 40, 50, 60,
70, and turns on the switches SW _{1 to} SW ₄ in a time division manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time-division type insulated power supply device in which a single insulated parent power supply unit is time-divisionally connected to a plurality of individual power supply units having capacitors to supply a plurality of load circuits. Regarding

[0002]

2. Description of the Related Art Conventionally, when a plurality of isolated power supplies are required, a plurality of independent windings are provided on the secondary side of a power transformer whose primary side is connected to a parent power supply, and load is applied to each of these windings. A plurality of isolated power supplies were configured by connecting the circuits.

[0003]

However, according to the above method, the secondary winding of the power supply transformer must be provided in proportion to the number of insulated power supplies, which causes a problem of increasing the size of the transformer. In addition, each secondary winding must be provided with a rectifier circuit and output pin terminals must be provided on the secondary side of the power transformer according to the number of isolated power supplies, which generally complicates the structure and increases the cost. Was invited. The present invention has been made to solve the above problems, and an object of the present invention is to simplify the structure and reduce the size by reducing the number of secondary windings, rectifier circuits, output pin terminals, etc. of a power transformer. An object of the present invention is to provide a time-division type insulated power supply device that enables weight reduction and cost reduction.

[0004]

In order to achieve the above object, the present invention provides a single isolated parent power source section having a power transformer whose primary side is connected to an AC power source, and a secondary side of the power transformer. A switching circuit having a plurality of switches connected in parallel, and a plurality of individual power supply units having capacitors having both ends connected to the output side of these switches, and turning the switches on in a time division manner Is.
Here, each switch in the switching circuit may be a semiconductor switch that can be switched in a short time, and the on time of the switch is preferably set according to the power consumption of the individual power supply unit.

[0005]

In the present invention, a plurality of individual power supply units are connected to the secondary side of the power supply transformer in the insulated parent power supply unit in a one-to-one correspondence via a plurality of switches in the switching circuit. By turning on the switch in a time-division manner, power is supplied to the load circuit via the corresponding individual power supply unit, and when the switch is off, the capacitor (electrolytic capacitor) in the individual power supply unit charged when the switch is on. ), Power is supplied to the load circuit.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of this embodiment. In the figure, reference numeral 1 denotes an insulated parent power supply unit, which is composed of a power transformer 11 having a primary winding connected to an AC power supply 2, a rectifying / smoothing diode 12 and an electrolytic capacitor 13 connected to the secondary winding. Has been done.

Reference numeral 3 denotes a switching circuit connected to the output side of the insulated parent power supply unit 1, and the number of switches S corresponding to a plurality (4 in this embodiment) of individual power supply units 40, 50, 60, 70.
It has W ₁ , SW ₂ , SW ₃ , and SW ₄ . That is, these switches SW _{1 to} SW ₄ independently connect both ends of the electrolytic capacitor 13 to the individual power supply units ₄₀ , 50, 60, 70.
Of the electrolytic capacitors 43, 53, 63, 73 of the double switch, which are connected in parallel to each other on the output side of the insulated parent power supply unit 1 and can be switched in a short time. Composed of. Although not shown, load circuits are connected to both ends of the electrolytic capacitors 43, 53, 63, 73, respectively.

2 and 3 show examples of controlling the switches SW _{1 to} SW ₄ in the switching circuit 3. That is, the switches SW _{1 to} SW ₄ are controlled so as to be sequentially turned on in a time division manner, and the individual power supply units connected in a time division manner when the switches are turned on cause the DC power output from the isolated parent power supply unit 1 to be supplied to the load circuit. Supply and charge the internal electrolytic capacitor,
When the switch is off, the DC power stored in this electrolytic capacitor is supplied to the load circuit.

The individual power supply units 40, 50, 60, 70
If the power consumption of the same, and equal to the on time t ₁ ~t ₄ of each switch SW ₁ to SW ₄ as shown in FIG. 2, equal power accumulated in the electrolytic capacitor 43,53,63,73 To do. Furthermore, the individual power supply units 40, 50, 60, 70
When the power consumptions of the electrolytic capacitors 43, 53, 63, 63 are different from each other, the on times t _{1 to} t ₄ are set to different values according to the respective power consumptions as shown in FIG.
The capacity of 73 is also set large with a margin. In the example of FIG. 3, the power consumption increases in the order of the individual power supply units 40, 50, 60, 70.

As described above, according to this embodiment, the secondary winding of the power transformer 11 and the diode for rectification in the insulated parent power source section 1 are related to the number of the individual power source sections 40, 50, 60, 70. Instead, each may be single, and the minimum number of output pin terminals of the insulated parent power supply unit 1 may be two. Therefore, the configuration of the insulated parent power supply unit 1 can be simplified. In the above-mentioned embodiment, the number of the individual power supply units is four, but it is possible to provide an arbitrary plurality of individual power supply units by increasing or decreasing the switches in the switching circuit 3.

[0011]

As described above, according to the present invention, a plurality of individual power supply units are provided on a secondary side of a power transformer in a single isolated parent power supply unit in a one-to-one correspondence via a plurality of switches in a switching circuit. Connected. Then, by turning on the switch in a time-division manner, power is supplied to the load circuit via the corresponding individual power supply unit, and when the switch is off, power is supplied to the load circuit by the electrolytic capacitor charged when the switch is on. It is something. Therefore, it is not necessary to provide a plurality of windings and a rectifier circuit on the secondary side of the power transformer as in the conventional case, and the number of output pin terminals of the insulated parent power source unit can be reduced, which simplifies the structure of the parent power source unit. It is possible to reduce the size, weight and cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of control of switches in the embodiment.

FIG. 3 is a diagram showing an example of control of switches in the embodiment.

[Explanation of symbols]

1 Insulation Master Power Supply Unit 2 AC Power Supply 3 Switching Circuit 11 Power Supply Transformer 12 Diode 13, 43, 53, 63, 73 Electrolytic Capacitor SW _{1 to} SW ₄ Switch 40, 50, 60, 70 Individual Power Supply Unit

Claims (2)

[Claims] 1. A single insulated parent power supply unit having a power transformer whose primary side is connected to an AC power source, and a switching circuit having a plurality of switches connected in parallel to the secondary side of the power transformer. A plurality of individual power supply units each having a capacitor having both ends connected to the output side of the switch, and the switch is turned on in a time-sharing manner. 2. The on-time of each switch in the switching circuit,
The time-division type insulated power supply device according to claim 1, wherein the setting is made according to the power consumption of the individual power supply unit.