JPH0785207B2 - Heating power supply - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a heating power supply device for heating and growing a load having a negative resistance characteristic such as silicon, and particularly, at the start of energization (initial heating).
The present invention relates to a heating power supply device that requires a high voltage and requires a large current at the final stage of energization (late heating stage).

[Prior Art] FIG. 1 is a circuit diagram showing a conventional heating power supply device, in which 1 is a tapped transformer having a primary winding 1a and a secondary winding 1b, and 2 and 3 are a pair of transformers, respectively. A thyristor unit in which thyristors are connected in anti-parallel and is connected to the tap of the secondary winding 1b. A polycrystalline semiconductor load 4 having a negative resistance characteristic such as silicon is connected to the secondary winding 1b through the thyristor units 2 and 3.

Next, the operation will be described. The load 4 before heating has a high resistance and requires a high-voltage power supply. Therefore, the thyristor unit 2 connected to the high voltage tap of the transformer with tap 1
It turns on and supplies a high voltage to the load 4.

In the thyristor unit 2, as the load 4 grows by heating and its resistance decreases, the phase of the energizing current is controlled by an output signal from a control circuit (not shown) so that a current commensurate with the growth of the load is energized. The power factor deteriorates due to the decrease in voltage. Therefore, when the supply voltage to the load falls to a predetermined specified value, the circuit is switched so that the output signal from the control circuit is supplied to the thyristor unit 3 connected to the low voltage tap of the tapped transformer 1. ,
The power factor is improved to continue energization, and finally the load 4 is grown until a large current flows.

Since the conventional heating power supply device is configured as described above, a high voltage tap requires a low current, but a low voltage tap requires a large current, so a special transformer is required, and a thyristor for current control is required. There were drawbacks such as the need for a large capacity unit.

[Summary of the Invention] The present invention has been made in order to eliminate the above-described conventional drawbacks, and at the start of energization, a plurality of loads are respectively connected in parallel to a power source to individually apply a high voltage. Using a simple and inexpensive main transformer with a structure that does not require a large number of low-voltage taps by connecting the loads in series as the load current increases and making the heating power output almost the same in all the energized sections. , A heating power supply device that does not require a large capacity thyristor unit.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG. 2 in which the same parts as those in FIG.

In FIG. 2, 21 is a main transformer, I is a thyristor unit group, 41 and 42 are loads having a negative resistance characteristic, and 51 and 52 are step-up transformers.

Thyristor unit group I consists of a pair of thyristors SCR1 and SC
It is composed of two thyristor units 2 and 3 formed by connecting R2 in antiparallel, and is connected in parallel to one end of the secondary winding 21b of the main transformer 21.

In the step-up transformers 51 and 52, the primary windings 51a and 52a are connected in series with each other, and are connected to one end of the secondary winding 21b of the main transformer 21 via the thyristor unit 2, and the secondary winding 51b, 52b are connected in series to each other with their polarities reversed, and are connected to one end of the secondary winding 21b of the main transformer 21 via the thyristor unit 3.

The loads 41 and 42 are connected in parallel to the secondary windings 51b and 52b, respectively, and are connected in series to each other and connected to one end of the secondary winding 21b via the thyristor unit 3.

Next, the operation will be described. To simplify the explanation,
The step-up ratio of the step-up transformers 51 and 52 is doubled. At the start of energization,
The loads 41 and 42 having the negative resistance characteristic require high voltage and low current.
In addition, a low voltage large current is required at the end of energization. For this reason,
At the start of energization, the loads 41 and 42 are connected in parallel and a high voltage is applied individually, and at the end, if the loads 41 and 42 are connected in series,
The load seen from the main transformer 21 is almost constant.

Therefore, when the energization is started, the thyristor unit 2 is turned on to energize the primary windings 51a and 52a of the step-up transformers 51 and 52. The loads 41 and 42 are connected to the secondary windings 51b and 52b, and when viewed from the power supply side, the loads 41 and 42 are connected in parallel to the secondary winding 21b of the main transformer 21. A high voltage is applied to the loads 41 and 42.

As the loads 41 and 42 grow by heating and their resistance decreases, the thyristor unit 2 receives an output signal from a control circuit (not shown) and performs phase control of the energizing current.
A current corresponding to the growth of 42 is applied. And the load 41,
When the voltage supplied to 42 drops to a predetermined specified value, the thyristor unit 2 is turned off and the thyristor unit 3 is turned on by switching the circuit with an output signal from a control circuit (not shown) to load the loads 41 and 42. It is connected in series to the secondary winding 21b of the main transformer 21. As a result, the voltage seen by the load from the power supply side is doubled, the current is halved, the power factor is improved, and eventually the load 41, 42 grows until a large current flows.

In the above embodiment, an example in which the two loads 41 and 42 are provided has been shown.
FIG. 3 is a circuit diagram including a main transformer 21, a thyristor unit group I, a plurality of step-up transformer unit groups 5, a plurality of loads 41 to 4m, and a control circuit. Thyristor unit group I
It is composed of a plurality of thyristor units 31 to 3n configured by connecting a pair of thyristors SCR1 and SCR2 in anti-parallel, and each is connected in parallel to one end of the secondary winding 21b of the main transformer 21.

In the step-up transformer group 5, the primary windings 51a to 5ma are connected in series with each other, and the two primary transformers 21 of the main transformer 21 are connected via the thyristor unit 31.
N step-up transformers connected to one end of the secondary winding 21b, and secondary windings 51b to 5mb connected in series with their polarities reversed.
The first step-up transformer unit 5a consisting of 51 to 5 m and the primary windings 61a to 6ma are connected in series with each other and connected to one end of the secondary winding 21b of the main transformer 21 via the thyristor unit 32. A second step-up transformer unit 5b consisting of n / 2 step-up transformers 61-6m in which the secondary windings 61b-6mb are connected in series with their polarities reversed, and the primary windings 71a-7ma. Are connected in series with each other, and the main transformer 21 is connected via the thyristor unit 33.
A third step-up transformer consisting of n / 4 step-up transformers 71, 7m connected to one end of the secondary winding 21b and in which the secondary windings 71b to 7mb are connected in series with their polarities reversed. Like the unit 5c, it is composed of a plurality of step-up transformer units in which the number of step-up transformers sequentially decreases by n / 2.

A plurality of loads 41 to 4m are connected in parallel to the secondary windings 51b to 5mb of the step-up transformers 51 to 5m, respectively, and two loads in series (4
1, 42), (43, 44) are secondary windings 61b of step-up transformers 61 to 6m
~ 6mb connected in parallel, 4 series loads (41-44),
(45 to 4 m) is connected to the secondary windings 71 b to 7 mb of the step-up transformers 71 to 7 m in parallel so that the number of series is increased by two times.

With the above configuration, any number of loads can be provided. Further, the greater the number of loads, the greater the number of combinations of series and parallel loads, which has the advantage that finer power factor adjustment can be performed.

[Effects of the Invention] As described above, according to the present invention, two thyristor units each configured by connecting a pair of thyristors in anti-parallel are connected in parallel to one end of the secondary winding of the main transformer and are connected in series. The primary winding of the connected step-up transformer is connected to one side of the thyristor unit, and the secondary windings of the step-up transformer connected in series with each other with opposite polarities are connected to the other side of the thyristor. Since the load connected in parallel with the secondary winding is connected in series to each other to form the step-up transformer unit, the thyristor unit and the step-up transformer can switch between the series and parallel of the load and at the same time control the load current. I can do it.
In particular, when connected in parallel, the step-up transformer uses the function of a current distributor that equalizes the current flowing to each load, and is extremely useful as a heating power supply device that heats and grows negative resistance characteristics such as silicon. It is valid. And
Uses a simple and inexpensive main transformer with a structure that does not require a low-voltage tap, does not require a large capacity thyristor unit,
At the start of energization, a high voltage is individually supplied to each of a plurality of loads from the secondary winding of a step-up transformer as a power source, and the loads are sequentially connected in series according to an increase in the load current, and all the energization sections are operated. There is an effect that a heating power supply device can be obtained in which the heating power supply output to the load can be made substantially the same.

In addition, a first step-up transformer unit in which a load is connected in parallel to each of the secondary windings of a large number of step-up transformers whose polarities are opposite to each other, and the first step-up transformer unit The number of step-up transformers is reduced to 1/2, 1/4 ... and the second ... nth step-up transformer unit is provided, and the number of series connections of the load is increased to 2 times, 4 times ... 2 ... nth
Since it is configured by connecting to the secondary winding of the step-up transformer unit, it has the above-mentioned effects and can increase the number of series and parallel combinations of loads, and can finely adjust the power factor. It is extremely effective as a heating power supply device for the load.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a conventional heating power supply device, FIG. 2 is a circuit diagram showing a heating power supply device according to an embodiment of the present invention, and FIG. 3 is a circuit diagram showing another embodiment of the present invention. . 1 is a transformer with taps 1, 2, 3, 31 to 3n are thyristor units, 4 and 41 to 4m are polycrystalline semiconductor loads, 5 to 5m are step-up transformers, 61 to 6m are step-up transformers, 71 to 7m are Step-up transformer, 8
1 and 82 are step-up transformers and 21 is a main transformer. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

[Claims] 1. A main transformer (21), a thyristor unit group (I), two step-up transformers (51) and (52), and loads (41) and (42) having negative resistance characteristics. And a control circuit, wherein the thyristor unit group (I) comprises a pair of thyristors (SC
R1 and SCR2) are composed of two thyristor units (2) and (3), which are configured by connecting them in anti-parallel.
The step-up transformers (51, 52) are connected in parallel to one end of the secondary winding (21b), and the primary windings (51a, 52a) of the step-up transformers (51, 52a) are connected in series with each other, and the primary windings are connected via the thyristor unit (2). It is connected to one end of the secondary winding (21b) of the transformer (21), the secondary windings (51b) and (52b) are connected in series with each other with their polarities reversed, and through the thyristor unit (3). Connected to one end of the secondary winding (21b) of the main transformer (21), the loads (41) and (42) are respectively connected to the secondary windings (51b) and (52).
b) connected in parallel, and connected in series with each other and connected to one end of the secondary winding (21b) via the thyristor unit (3). The control circuit controls each load (41) at the start of energization, A heating power supply device that controls each thyristor unit (2) and (3) so that (42) is connected in parallel and is connected in series in the process of increasing the load current. 2. A heating power supply device having a main transformer (21), a thyristor unit group (I), a plurality of step-up transformer unit groups (5), a load (41 to 4 m), and a control circuit. Therefore, the thyristor unit group (I) consists of a pair of thyristors (SC
R1 and SCR2) composed of multiple thyristor units (31-3n) connected in anti-parallel, each of which is a main transformer (21).
Is connected in parallel to one end of the secondary winding (21b), and the step-up transformer unit group (5) is the primary winding (51a to 5ma).
Are connected in series with each other, and are connected to one end of the secondary winding (21b) of the main transformer (21) via the thyristor unit (32), and the secondary windings (51b to 5mb) have opposite polarities. N connected in series with each other and connected to one end of the secondary winding (21b) of the main transformer (21) through the thyristor unit (31)
A first step-up transformer unit (5a) consisting of a single step-up transformer (51-5m) and a primary winding (61a-6ma) are connected in series with each other, and a main transformer is provided via a thyristor unit (33). N / 2 step-up transformers (61 ~) connected to one end of the secondary winding (21b) of the device (21) and connected in series with the secondary windings (61b ~ 6mb) with opposite polarities. 6m) second step-up transformer unit (5b) and primary windings (71a to 7ma) are connected in series with each other, and the secondary winding of the main transformer (21) is connected via a thyristor unit (33 + 1). Third step-up consisting of n / 4 step-up transformers (71, 7m) connected to one end of line (21b) and secondary windings (71b-7mb) connected in series with each other with opposite polarities Like the transformer unit (5c), it consists of multiple step-up transformer units (5a to 5m) in which the number of step-up transformers decreases by n / 2 in sequence, and n load (41 to 4m). Each step-up transformer (51~5m)
Are connected in parallel to the secondary windings (51b to 5mb) of the load, and two loads (41, 42) and (43, 44) in series are connected to the step-up transformer (61 to 6).
m) secondary windings (61b-6mb) are connected in parallel, and four series loads (41-44), (45-4m) are connected to the step-up transformer (71-7).
m) secondary windings (71b to 7mb) connected in parallel so that the number of series is increased by 2 times in sequence, and the control circuit connects each load (41 to 4m) in parallel at the start of energization. The heating power supply device controls each thyristor unit (31 to 3n) so that they are connected in series in the process of increasing the load current.