JPS584417A - Single converter - Google Patents

Abstract

PURPOSE:To ensure the effective use of the excited energy, by connecting the third winding containing a parallel stabilized circuit with the additive polarity opposite to the electromagnetic connection style between the primary and secondary windings. CONSTITUTION:When the closure of a switching circuit 11 is released, the voltage induced to the third winding 21 by the excited current flowing to the primary winding 13 is supplied to a parallel stabilized circuit 23 via a single wave rectifying circuit 22 and then to the 2nd load 25. The circuit 23 transmits the excited energy to the load 25 so that the sum of the electric power consumed at a transistor 23c and the electric power consumed at the load 25 is equal to the excited energy transmitted via the winding 21 although the power consumption of the load 25 has the fluctuation. As a result, the excited energy is thoroughly consumed althrough the power consumption of the load is reduced down to zero.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single converter that can effectively utilize the excitation energy wasted when resetting the excitation current.

Conventionally, this kind of single converter, as shown in Fig. 1, is transformed to reset the primary current of the transformer 1, that is, to make the primary current zero by the time when the switching transistor 2 is next turned on. 1i) A set circuit consisting of a diode 4, a resistor 5, and a capacitor 6 is used in parallel with the primary winding 3 of 1.

Although this reset circuit is essential for the single converter to operate smoothly, the negative excitation current flows to the reset circuit while the transistor 2 is off and is consumed by the resistor 5. Therefore, all of this consumed electrical energy becomes a loss in the single converter, and the efficiency of the single converter inevitably decreases by that amount.

The present Ij11 was devised in view of the drawbacks of the conventional single converter as described above, and its purpose is to provide a single converter that can effectively utilize excitation energy and at the same time perform a reset function. There is a particular thing.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 2 shows a single converter according to the present invention. Reference numerals L and 10 indicate a DC current source, and the power source is connected to the primary winding 13 of a transformer 12 via a switching circuit 11. Reference numeral 14 denotes a secondary winding, which is electromagnetically coupled to the primary winding via its iron core 15 in a depolarized manner. VcFi between the output terminals of the secondary winding 14 As in the conventional case, a rectifier circuit consisting of diodes 16 and 17, an inductor 18, and a capacitor 19 is connected to the output of the rectifier circuit, and a load 20 of the circuit 1 is connected to the output thereof.

In addition, the secondary winding 21 is connected to the second best 1113 through the iron core 15.
The primary winding 13 and the secondary winding 14 are electromagnetically coupled by additive polarity, which is an electromagnetic coupling scheme opposite to that between the primary winding 13 and the secondary winding 14 . A single wave rectifier circuit 22 and a parallel stabilizing circuit 23 are connected in cascade to the output terminal of the tertiary winding 21.
A second load 25 with a capacity predetermined according to is connected.

For example, the rectifier circuit 22 connects W! to the output of the tertiary winding 21 in series.
A capacitor connected in parallel to the connected diode 22m and the output of the tertiary winding 21? 22b.

The parallel stabilizing circuit 23 includes, for example, a Zener diode 23 and a resistor 23b and an NPN at the output of the IT current circuit 22.
It) Connect the transistor 23@ in parallel.

A connection point 234 between the diode 231 and the resistor 29b is connected to the base of the transistor 23e.

The operation of the converter of the present invention having the above-mentioned configuration will be explained.

The DC power supply 10 switches at a predetermined period.

When the switching circuit 11 is closed, a current that rises at a constant rate flows through the primary winding 13 of the transformer 12 to energize it.

The voltage induced in the secondary winding 14 by this energization is rectified by a rectifier circuit, and a desired direct current is supplied to the load 20.

Even when this power supply is being performed, the secondary winding 21KFi
Although a voltage is induced, it is in a direction that is not rectified by the single wave rectifier circuit 22.

When the switching circuit 11 is unclosed, the voltage generated in the tertiary winding 21Kg by the excitation current that flows through the primary winding 13 passes through the single-wave rectifier circuit 22, and then the parallel stabilizing circuit 23 and the second Power is supplied to the load 25 of.

Even if the power consumption of the second load 25 fluctuates, the parallel stabilizing circuit 23 maintains its output voltage constant through the action of the Zener diode 231 and the transistor 23@.
Excitation energy is transferred to the second load 25 such that the sum of the power consumed by the transistor 23 and the power consumed by the second load 25 matches the excitation energy transmitted via the tertiary winding 21. Communicate. Because such transmission takes place, even if the load power consumption becomes zero, there is a means to consume all the excitation energy, and the reset function of the single converter can be achieved without any problems. .

In this way, the excitation energy stored in the negative winding 13 is transferred to the primary winding 13 and the secondary winding! It is supplied to the parallel type stabilizing circuit 23 and load 25 which consume power through electromagnetic coupling with I21. The amount of power supplied to the load varies depending on the load capacity up to a value represented by zero when no load is connected. However, in the above equation, ■ is the output voltage of the DC power supply, and TI is the time during which the switching circuit 11 is closed.

Hori is the excitation inductance of the primary winding 13, and τ is the switching period of the switching circuit 11.

Even if the load changes from zero to the excitation energy in this way, the excess excitation energy that is not transmitted to the load 25 is absorbed by the parallel stabilizing circuit 22.

According to the invention, therefore, the excitation energy that has to be consumed when resetting a single converter is utilized as effectively or completely as possible as a supply voltage to the load, and the resetting function is generated through this effective use. . This greatly contributes to improving the efficiency of the single converter.

In addition, although the multi-output circuit is configured as described above,
In this circuit, the output circuit of the gist of the present invention does not require the inductor required in the rectifier circuit of the conventional output circuit.

In the above embodiment, an example in which the number of tertiary windings is one has been described, but there may be a plurality of four tertiary windings. Of course, also in this case, the electromagnetic coupling form of each tertiary winding to the primary winding is the same as described above.

As is clear from the above description, according to the present invention, the following effects can be obtained.

■It can perform the reset function while making effective use of the exciter/Nehru.

■This effective use will provide another load output to the single converter.

(2) The efficiency of the single converter can be improved as much as possible while achieving the above effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional single converter, and FIG. 2 is a circuit diagram of a single converter according to the present invention. In the figure: 10Fi DC power supply, 13ij - secondary winding, 14 is secondary winding, 20 is first load, 21 is tertiary winding, 22F
i Single wave rectifier circuit, 23 is parallel type stabilization circuit, 25 & 1!
This is the second load. Figure 1 Figure 2

Claims (1)

[Claims] In a single converter that rectifies the voltage induced in the secondary winding when the primary winding is connected to a DC power supply via a switching circuit and supplies power to the first load, the above-next winding mK is electromagnetically coupled. between a tertiary winding of which polarity is opposite to the depolarization between the secondary winding and the secondary winding and the output terminal of the tertiary winding. @
a parallel type connected between a rectifier circuit which is connected to the secondary winding and rectifies the voltage induced in the tertiary winding when power is cut off to the secondary winding; and a second load connected between the output terminals of the rectifier circuit; A single converter characterized by being equipped with a stabilizing circuit.