JPS605753Y2 - Phase-shifting power supply circuit - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a phase-shifting power supply circuit.

Conventionally, as this type of power supply circuit, a rectifier circuit and a filtering circuit consisting of a capacitor, a resistor, or a choke coil are connected to the secondary side of a transformer connected to a commercial power supply.
It was common practice to obtain a so-called direct current voltage.

However, in such a circuit configuration, the amount of ripple changes depending on the capacitance of the so-called smoothing capacitor, so it is common to use a capacitor with the largest possible capacitance, which results in a larger power supply circuit. There was a drawback.

The present invention aims to improve the above-mentioned drawbacks and provide a power supply circuit that can be miniaturized.

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

FIG. 1 shows the principle of an embodiment of the phase-shifting power supply circuit of the present invention.

In the figure, T□ is a ferro-resonant house type transformer, part 1
The secondary coil W1□ is connected to the power supply side, a resonant capacitor C is connected to both ends of the secondary coil W1゜, and a full wave is connected between the midpoint of the secondary coil W11 and either end of the secondary coil. The input side of the rectifier D is inserted, and the full wave rectifier
Output side terminal a.

b is connected to DC output terminals A and B.

T2 is a normal transformer, whose primary coil W2□ is connected to the power supply side, and both ends of its secondary coil W2゜ are connected to the input side of the full-wave rectifier D2. Output terminals c and d are connected to DC output terminals A and B, respectively.

Next, the operation of the circuit of the present invention will be explained.

Figure 2 A shows the voltage when there is no load, and the voltage V□
indicates the no-load output voltage of the ferroresonant transformer T□, and
V2 indicates the no-load output voltage of transformer T2.

The opening in Figure 2 shows the output voltage when the load is applied. Voltage 1 shows the output voltage of the ferro-resonant transformer T1, voltage V2 shows the output voltage of the transformer T2, and the load When V2 is applied, the voltage (1) shifts in phase in accordance with the load current, and the voltage V2 represents a composite voltage of the voltages V and V2.

As shown in the figure, it can be seen that the composite voltage V is a DC voltage with extremely few ripples.

Figure 3 shows an example of a transformer used in the circuit of the present invention constructed with one core.This transformer is constructed by combining an E-type core 1 and an I-type core 2. Above the central leg 3 of the E-type iron core is a lower winding and a coil W11. W2□ is wound, and coil W4 is wound on top of this.

In this case, coil W1. The coil W21 is also used as a common primary coil.

Further, W, 2 is wound around the lower part of the central leg 3, and 4 is a rectangular iron core, which is inserted between the upper coil and the lower coil.

In this invention, as shown above, the output voltage of the ferro-resonant transformer,
The transformer T1. Since the phase difference between the output voltages on the secondary side of T2 increases as the load on the secondary side increases, it is possible to reduce ripples in the rectified voltage without using a smoothing capacitor as in the past. This has the effect of reducing the influence of a so-called smoothing capacitor.

Note that the wiring shown in FIG. 1 is for the case where the outputs of the rectifiers D1, D2 are connected in parallel, but the outputs of the rectifiers D1, D2, and D2 are connected in parallel.
The output of D2 is connected in series, that is, the DC output terminal A is connected to the rectifier D.
Connect to the output side terminal a of 1, and the output side terminal is connected to the rectifier D2.
It can also be used by connecting the output side terminal C to the output side terminal C, and connecting the output side terminal d to the DC output terminal B.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the power supply circuit of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a diagram showing the transformer used in the circuit of the present invention. T1. T2...Transformer, W11~W4...
...Coil, Dl, D2... Rectifier, A, B
...DC output terminal, 1...E type iron core,
2...■ type iron core, 3...center leg, 4...
・・・・・・Strip type iron core.

Claims (1)

[Scope of utility model registration request] In a power supply circuit used for audio equipment, etc., the secondary side output of a ferro-resonant transformer whose primary side is connected to a commercial power supply, and the
A phase-shifting power supply circuit characterized in that the secondary side output of a normal transformer whose next side is connected to a commercial power supply is rectified, and these two rectified outputs are combined to obtain a combined output.