KR20090078886A - Voltage division apparatus for transformer - Google Patents

Abstract

A voltage division apparatus for transformer is provided to reduce a manufacturing cost by satisfying a driving voltage of a secondary load and reducing a weight and a size thereof. A voltage division apparatus for transformer includes a transformer(120) and a voltage drop unit(130). A primary coil of the transformer is connected to a power source(110). A secondary coil is connected to a first load(140). The voltage drop unit is serially connected with the primary coil of the transformer. A second load is connected in parallel to the primary coil of the transformer and the voltage drop unit. The first load corresponds to a control unit for controlling operations of the second load. The first load is a circuit for requiring the additional ground with respect to the second load.

Description

Transformer Voltage Distribution Device {VOLTAGE DIVISION APPARATUS FOR TRANSFORMER}

The present invention relates to a transformer voltage distribution device, and more particularly to a transformer voltage distribution device for reducing the magnitude of the voltage applied to the transformer.

An electric transformer is a device that changes the value of alternating voltage or current by using electromagnetic induction. It is formed by winding coils on both sides of the iron core. The coil on the opposite side is called the secondary coil.

Such a transformer has been used for various purposes, Figure 1 shows an example of the use of the transformer.

If there is a load 30 that operates at a different voltage than the power source 10, the power source (using the transformer 20 whose winding ratio between the primary side (primary coil) and the secondary side (secondary coil) is properly adjusted) The voltage of 10 is converted into a voltage suitable for driving the load 30. Today, there are various voltage regulating devices such as regulators. Instead of using a transformer, the voltage regulating device may be used. However, the greatest benefit that can be obtained by using the transformer 20 is that the primary circuit of the transformer It is possible to separate the ground of the secondary circuit. Therefore, it is advantageous to use a transformer when the ground of the primary side circuit and the secondary side circuit is to be separated, and an example thereof is shown in FIG. 2.

2 illustrates a constant load 30 and a controller 40 for controlling the load. Herein, if the controller 40 is a circuit that needs to be separated from the load 30 and the ground, the controller 40 driven at a voltage lower than a voltage required by the load generally controls the transformer 20. It is driven by receiving the voltage dropped through it to control the load 30 is operated by applying a voltage directly from the power supply (10).

In the above, the use of a transformer has been described. In the related art, since power is directly applied to the primary side of the transformer as shown in FIGS. 1 and 2, only a relatively low voltage is formed on the secondary side. Even so, a primary coil corresponding to the voltage of the power source must be formed. Therefore, an unnecessarily large transformer is required due to the characteristics of a transformer having an iron core and a coil structure, which acts as an element of an increase in production cost, and also increases the weight and volume of the transformer to counter the trend of weight reduction and miniaturization today. There is a problem done. Accordingly, there is a need to form a size of the transformer suitable for the secondary load.

The present invention has been made to solve the above problems, and an object of the present invention is to enable a transformer having a small weight and size while satisfying a driving voltage of a secondary load.

In addition, by reducing the weight and size of the transformer, it is intended to reduce the production cost.

In order to achieve the above object, the present invention provides a transformer voltage distribution device including a transformer connected to a primary coil and a secondary coil connected to a first load, and a voltage drop connected in series with the primary coil of the transformer. present.

Here, it is preferable to further include a second load connected in parallel to the transformer and the primary coil of the transformer, the first load is preferably a control unit for controlling the operation of the second load. In addition, the first load is preferably a circuit requiring a separate ground for the second load.

The voltage drop unit is the following equation

V _{voltage drop} : The voltage across the voltage drop

V _{transformer primary coil} : voltage applied to the primary coil of the transformer

It is preferable to have an impedance value satisfying the voltage drop, and the voltage drop unit may be a capacitor.

In addition, the transformer voltage distribution device according to the present invention preferably further includes a third load connected in series with the primary coil of the transformer. The control unit may further include a fourth load connected in parallel to the primary coil, the voltage drop unit, and the third load in parallel, wherein the third load controls the operation of the fourth load. Preferably, the first load is a circuit that requires a separate ground for the fourth load. The first load may be an electromagnetic wave attenuator that detects and attenuates electromagnetic wave generation of the fourth load.

The voltage drop unit is the following equation

V _{voltage drop} : The voltage across the voltage drop

V _{transformer primary coil} : voltage applied to the primary coil of the transformer

V _{third load} : voltage applied to the third load

It is preferable to have an impedance value satisfying the voltage drop, and the voltage drop unit may be a capacitor.

As described above, the transformer voltage distribution device according to the present invention includes a voltage drop connected in series with the primary coil of the transformer, so that only the voltage dropped from the voltage drop is applied to the primary coil of the transformer. It is possible to reduce the capacity, specifically the size and weight of the transformer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a block diagram schematically showing a transformer voltage distribution device according to an embodiment of the present invention.

Referring to FIG. 3, the transformer voltage distribution device according to the present embodiment includes a transformer unit 120 in which a primary coil is connected to a power source 110 and a secondary coil is connected to a first load 140; And a voltage drop unit 130 connected in series with the primary coil of the transformer unit 120.

The transformer 120 includes one or more transformers, the power source 110 is connected to a primary (primary) coil of each transformer, and the first load 140 is connected to a secondary (secondary) coil. It is. In FIG. 3, the transformer 120 is configured by only one transformer. In view of this, the primary coil takes a voltage dropped from the voltage dropping unit 130, so that it is suitable for the dropping voltage. The number of turns, and the secondary coil has a number of turns suitable for the first load 140. The transformer 120 separates the grounds of the circuits of the primary coil side and the secondary coil side from each other, and circuits for various purposes are located in the first load 140.

The voltage drop unit 130 is connected in series with the primary coil of the transformer 120 so that the voltage of the power supply 110 is distributed to itself and the transformer 120. The voltage drop unit 130 is composed of a device having a predetermined impedance value, it can be configured in various ways. The voltage dropping unit 130 drops the voltage (power supply voltage) of the power supply 110 so that only the voltage (dropping voltage) dropped to the transformer 120 is applied, thereby increasing the capacity of the transformer 120. It is possible to match the voltage drop rather than the power supply voltage. Since the present embodiment is based on the premise that the first load connected to the secondary coil has a driving voltage lower than the power supply voltage, matching the capacitance of the transformer unit 120 to the drop voltage is the transformer unit 120. ) Will mean a decrease in capacity. Such a reduction in the capacity of the transformer unit 120 leads to a reduction in size of the transformer unit 120 and thus a weight reduction, which leads to a reduction in size, weight, and production cost of the entire circuit.

4 illustrates a transformer voltage distribution device according to another exemplary embodiment of the present invention, in which a transformer 120, a primary coil, and a voltage drop unit 130 are connected in series with respect to a power source 110. The second load 150 is connected in parallel to the transformer 110, that is, the primary coil and the voltage drop unit 130 as a whole.

When the second load 150 requires separation of the ground from the first load 140 connected to the secondary coil of the transformer 120, such a configuration becomes more meaningful. It is useful when the driving voltage of the second load 150 is higher than the driving voltage of the first load 140 and approaches the voltage of the power source 110.

In the related art, since the voltage dropping unit 130 is not provided as in the configuration of FIG. 2, the power supply voltage applied to the second load is applied to the primary coil of the transformer 120 as it is. 120 required a capacity suitable for the power supply voltage regardless of the driving voltage of the first load 140 connected to the secondary coil on its output side. As described above, the transformer having a capacity suitable for the power supply voltage is not only large in size and weight, but also adversely affects an increase in production cost. Thus, the transformer lowers the voltage through the voltage lowering unit 130 to lower the transformer 120. It is desirable to use a transformer of a small capacity by allowing a voltage to be applied.

The first load and the second load may be meaningful because the circuits are in an organic relationship with each other even if the ground is separated. It would be desirable to be a subcircuit that needs to isolate ground in the circuit configuration.

In summary, the transformer is formed to provide a voltage suitable for the first load connected to the transformer secondary coil, and the voltage transformer is connected in series with the transformer primary coil to form the transformer primary coil. Do not apply a large voltage, such as the power supply voltage, and consequently reduce the capacity of the transformer.

To this end, the voltage applied to the transformer primary coil and the voltage applied to the voltage dropping unit satisfies Equation 1 below.

V _{voltage drop} : The voltage across the voltage drop

V _{transformer primary coil} : voltage applied to the primary coil of the transformer

That is, the voltage drop unit preferably has an impedance value satisfying Equation (1). Of course, it is not necessary to satisfy the above Equation 1, in this case, the reduction of the transformer capacity obtained through the voltage drop will be less than expected (the size and weight reduction of the transformer is small). For reference, the voltage drop may be configured as a capacitor.

FIG. 5 is a block diagram illustrating a transformer voltage distribution device according to another exemplary embodiment of the present invention, and further includes a third load 160 connected in series with the primary coil of the transformer 120 of FIG. 3.

According to such a configuration, the voltage of the power source 110 is distributed by the voltage drop unit 130, the transformer unit 120, and the third load 160 connected in series. When the voltage drop in the third load is as much as desired, the voltage drop unit 130 may not be required. However, when the third load also needs to take only a part of the power supply voltage, the voltage drop unit 130 That makes sense.

That is, the voltage drop unit preferably has an impedance value satisfying Equation 2 below.

V _{voltage drop} : The voltage across the voltage drop

V _{transformer primary coil} : voltage applied to the primary coil of the transformer

V _{third load} : voltage applied to the third load

FIG. 6 is a block diagram illustrating another embodiment of FIG. 5, wherein a fourth load connected in parallel to the primary coil, the voltage drop unit 130, and the third load 160 of the transformer unit 120 is described. It further includes 170.

The first load 140 is a circuit that needs to be separated from the ground with respect to the fourth load 170, and the driving voltage of the first load 140 is lower than that of the fourth load 170. It is a useful circuit configuration in one case. The first load 140 may be configured as a control unit of the fourth load 170, but in general, the control unit is formed of the third load 160 because it is not necessary to separate the ground. Preferably, the first load forms a separate circuit. In summary, in the configuration as illustrated in FIG. 6, the third load 160 is a control unit for controlling the operation of the fourth load 170, and the first load 140 provides a separate ground for the fourth load. It is preferable to comprise with the request | requirement circuit.

For example, a circuit may be configured as shown in FIG. 7.

FIG. 7 includes a constant power source 110 and a voltage drop unit 130 connected in series to the power source 110, a control unit 161, and a transformer unit (primary coil) 120, and the transformer unit 120. The electromagnetic attenuator 141 is connected to the secondary coil of), and is connected in parallel to the power source 110, that is, the voltage dropping unit 130, the controller 161, and the transformer primary coil. A transformer voltage distribution device with four loads 170 is illustrated.

The controller 161 is an element corresponding to the third load 160 of FIG. 6, and the electromagnetic wave attenuator 141 is an element corresponding to the first load 140 of FIG. 6. Is to control the fourth load, and the electromagnetic wave attenuator 141 detects and attenuates electromagnetic waves generated by the fourth load 170.

In order to detect electromagnetic waves, it is necessary to separate the ground between the detection target and the detection apparatus, and thus, a detection apparatus, that is, an electromagnetic wave attenuation portion 141, needs to be formed in the transformer 120 secondary coil as shown in FIG. In general, a circuit for performing electromagnetic detection and attenuation requires a driving voltage lower than a driving voltage of the fourth load 170, which is an electromagnetic wave detection target. Most of the voltages of the power source 110 according to a conventional configuration are It is applied to the transformer unit 120. Therefore, in the related art, the transformer 120 has to have a transformer having a capacity corresponding to the power supply voltage, which is a secondary coil side electromagnetic wave of the transformer 120 requiring a significantly lower driving voltage than the power supply voltage. It was an excessive measure about the damping part 141. For example, assuming that the power supply voltage is 220V and the driving voltage of the electromagnetic wave attenuator 141 is 5V, the transformer is 220V: 5V (the 5V may vary depending on the circuit configuration of the electromagnetic attenuator. It should be configured to output voltage higher than 5V.) A transformer of 220V: 5V capacity is large in size and weight, and goes against miniaturization and light weight, and requires considerable cost. . In the present embodiment, a voltage dropping unit 130 is connected in series with the transformer 120 to the primary coil, and the voltage dropping unit 130 lowers a power supply voltage to the transformer 120. By application, for example, the use of a transformer that performs a 15V: 5V transformation is made possible. The 15V: 5V transformer has less capacity than the 220V: 5V transformer, which means that the transformer size and weight are smaller. In addition, since the capacity, size, and weight of the transformer affects the production cost, a 15V: 5V transformer has a lower production cost than a 220V: 5V transformer.

The control unit 161 also gains due to the voltage drop unit 130. Even when the voltage drop unit 130 is not present, the control unit 161 includes a rectifier circuit having a zener diode having a large capacitance, but is applicable, but the zener diode should be used at a large capacitance. It is preferable to configure the voltage applied through the voltage dropping unit 130 by dropping the zener diode having a smaller capacity. This is possible when the controller 161 also requires a voltage lower than the driving voltage of the fourth load 170 controlled by the controller, and adjusts the voltage for the voltage dropped due to the voltage dropping unit 130. By providing an associated circuit, it is possible to reduce production costs.

The voltage drop unit 130 may be configured as an element including an impedance component capable of dropping a voltage. In the alternating current (transformer is mainly used in alternating current), the voltage dropping unit 130 is preferably configured as a capacitor. Since the capacitor corresponds to the capacitor, it takes reactance, which is an imaginary part of the impedance, and it is advantageous in terms of system stability because it generates less heat than a resistor when a high voltage is applied. A capacitor is a device that passes current during charging and does not pass current after charging is complete. When the capacitor is fully charged, the circuit behaves as if it is disconnected, but current flows continuously in AC. The capacitance C of the capacitor is calculated according to the following equation (3).

C: capacitance

Q: electric charge

V: Voltage

When the capacitor is used as the voltage drop 130, the capacitor continuously passes current when the power is alternating current, and the amount of current is limited according to the capacitance of the capacitor. Therefore, the current passing through the capacitor becomes small, and this small current is multiplied by the impedance of the transformer or the third load to form a voltage, at which time the voltage decreases by the reduced current passed through the capacitor. Done. As a result, it is possible to reduce the capacity of the transformer, and also to reduce the capacity of the device used for the third load.

Although the operation of the capacitor, ie, the capacitor, is slightly different from the general voltage drop, as a result, it can be seen that the voltage is divided and distributed from the viewpoint of the transformer, and thus, the present invention is used as a category of voltage drop. Application of is possible throughout all of FIGS. 3-8 according to an embodiment of the invention.

8 illustrates an example in which the capacitor C1 is used as the voltage drop unit 130.

Referring to FIG. 8, power voltages AC1-AC2 are applied, and capacitors C1, voltage transformers T1, primary coils, and diodes D1 and D2 serving as third loads are voltage drop parts. Zener diodes ZD1 are connected in series.

Such a circuit configuration may include, for example, a fourth load (not shown in FIG. 8) of the heat insulating mat corresponding to a heat wire in the heat insulating mat. 4 The ground of the load (heat wire) and the electromagnetic wave attenuation part 141 which is the first load should be separated. Of course, the right side FDC_ + V and FDC_GND of the electromagnetic wave attenuator 141 may further include a circuit (not shown) for electromagnetic wave detection and attenuation, and the electromagnetic attenuator 141 of FIG. 8 should be configured to include such a circuit. do. It is assumed that the controller 161 also includes a control related circuit (not shown).

In FIG. 8, thermistor RT1 is added for the purpose of system protection. AC power induced in AC1 is induced to thermistor RT1 via coupling capacitor C1. The transformer T1 is formed of a winding of N: 1, and the secondary side (secondary coil) voltage of the T1 is rectified through the zener diode ZD2 through the rectifier circuits D3, D4, D5, and D6, and the rectified voltage FDC_ + V is applied to the circuit for electromagnetic detection and attenuation. At this time, the primary side of the T1 (primary coil) is subjected to a voltage × N times the voltage of ZD2. Therefore, even if the input voltage of AC1 becomes high, the input side voltage of T1 will take N times the secondary side voltage. Therefore, even if the T1 itself becomes small, no heat is generated or broken. However, since N is related to the size, weight, and cost of the transformer, it is preferable to reduce the N. To this end, C1, which is a voltage drop part, is required, and the reactance value of C1 may be appropriately adjusted through Equation 4 below.

X _C1 : Reactance of C1

f: frequency

C: capacitor capacitance

If N is reduced without C1, damage occurs such as overload of T1, ZD1, ZD2, resulting in burnout of the circuit, and thus the voltage must be lowered through the voltage drop C1.

If a sudden excessive current flows through the circuit or if the ambient temperature rises, the thermistor RT1 increases the resistance to protect the circuit by limiting the current. Since the voltage of the thermistor RT1 is small when the entire circuit operates normally, it can be omitted in the present embodiment except for safety.

On the other hand, the control unit is fixed in the voltage by the zener diode ZD1, when there is no voltage drop portion C1, because it takes a higher power than when the voltage drop portion C1, a high capacity zener diode should be used but Due to the voltage drop C1, a smaller capacity zener diode can be constructed.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

It is advantageous if one circuit contains a constant load and another load that needs to separate the ground, and in particular, a circuit for detecting the generated electromagnetic waves generated from the heating wire in the electronic thermal insulation mat may be used. Useful for separations.

1 is a circuit diagram showing an example of use of a conventional transformer.

2 is a circuit diagram showing another example of FIG.

Figure 3 is a circuit diagram schematically showing a transformer voltage distribution device according to an embodiment of the present invention.

4 is a circuit diagram showing another example of FIG.

5 is a circuit diagram schematically showing a transformer voltage distribution device according to another preferred embodiment of the present invention.

6 is a circuit diagram illustrating another example of FIG. 5.

7 is a circuit diagram illustrating a more specific example of FIG. 6.

FIG. 8 is a circuit diagram showing the actual circuit configuration of FIG. 7. FIG.

* Description of the symbols for the main parts of the drawings *

110.Power supply 120 ... Transformer

130 ... voltage drop 140 ... first load

150 ... 2nd load 160 ... 3rd load

170 ... 4th load

Claims (12)

A primary coil is connected to a power supply and a secondary coil is connected to a first load; And And a voltage drop unit connected in series with the primary coil of the transformer unit. The method according to claim 1, And a second load connected to the primary coil of the transformer and the voltage dropping unit in parallel. The method according to claim 2, And the first load is a control unit for controlling the operation of the second load. The method according to claim 2, And the first load is a circuit requiring a separate ground for the second load. The method according to any one of claims 1 to 4, The voltage drop unit is the following equation

V _{voltage drop} : The voltage across the voltage drop V _{transformer primary coil} : voltage applied to the primary coil of the transformer Transformer voltage distribution device, characterized in that it has an impedance value satisfying. The method according to any one of claims 1 to 4, The voltage drop unit is a transformer voltage distribution device, characterized in that the capacitor. The method according to claim 1, And a third load connected in series with the primary coil of the transformer. The method according to claim 7, And a fourth load connected in parallel to the primary coil of the transformer, the voltage dropping portion, and the third load. The method according to claim 8, And the third load is a control unit for controlling the operation of the fourth load, and wherein the first load is a circuit that requires a separate ground for the fourth load. The method according to claim 9, And the first load is an electromagnetic wave attenuating unit which detects and attenuates electromagnetic wave generation of the fourth load. The method according to any one of claims 7 to 10, The voltage drop unit is the following equation

V _{voltage drop} : The voltage across the voltage drop V _{transformer primary coil} : voltage applied to the primary coil of the transformer V _{third load} : voltage applied to the third load Transformer voltage distribution device, characterized in that it has an impedance value satisfying. The method according to any one of claims 7 to 10, The voltage drop unit is a transformer voltage distribution device, characterized in that the capacitor.

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