Voltage stabilizer and electrical equipment system

Abstract

To stably supply a rated voltage to an electrical device in an electrical equipment system in which a voltage supplied from the electric power system is divided into multiple electrical devices, each connected in series.SOLUTION: An electrical equipment system comprises: two electrical devices 101 and 103 which are connected in series to an AC power supply, each having the same circuit configuration; and a voltage stabilizer 150 that stabilizes a voltage to be applied dividedly to the two electrical devices 101 and 103. In the voltage stabilizer 150, two coils 151 and 153 having turns ratio 1 are connected in parallel to the two electrical devices 101 and 103, and are also connected so as to cancel each respective magnetic field. The connection point 155 between one coil and the other coil of the two coils is connected to the connection point 105 between one electrical device and the other electrical device of the two electrical devices 101 and 103.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a voltage stabilizing device for stabilizing the voltage supplied to an electric device and an electric device system using the same.

Background Art

[0002] In recent years, since alternating current 200 volts as well as alternating current 100 volts is supplied from the power grid, there is a demand to use an electric device rated at 100 volts at 200 volts in order to obtain high power. In addition, there is a demand to use an electric device rated at 100 volts that has been used in regions such as Japan where alternating current 100 volts is supplied in regions such as the United States where alternating current 200 volts is supplied.

[0003] In order to use an electric device rated at 100 volts at 200 volts, it is common to step down the voltage through a transformer in order to avoid damage to the electric device due to overvoltage application. However, a large transformer capable of stepping down 200 volts to 100 volts is required, and the device configuration becomes complicated (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When using an electric device rated at 100 volts at 200 volts, as described above, it can be used after stepping down to the rated voltage through a transformer. In addition to this, there is a method of connecting electric devices rated at 100 volts connected in series to the power grid. According to this method, since the voltage supplied from the power grid is divided between the two electric devices, an electric device rated at 100 volts can be used at 200 volts.

[0006] However, due to variations in the load characteristics of the series-connected electrical devices, the desired voltage division may not occur, and a voltage exceeding the rating may be supplied to one of the electrical devices, which may prevent the electrical device from operating properly.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to stably supply a rated voltage to electrical devices in an electrical device system configured to divide and supply the voltage supplied from a power system to a plurality of series-connected electrical devices.

Means for Solving the Problems

[0008] The present invention includes a voltage stabilization device for stabilizing the voltage applied to a plurality of series-connected electrical devices, and is realized by the following concept.

[0009] (When the circuit configurations of the respective electrical devices are the same and the ratings of the respective electrical devices are the same) As shown in FIG. 4, in a configuration in which a power supply voltage is applied to a plurality of series-connected electrical devices N1, N2, N3, and N4, one winding and the other winding of two windings having a turns ratio of 1, which are connected in parallel to adjacent electrical devices N1 and N2 and are connected so as to cancel each other's magnetic fields, are connected to the connection point between one electrical device N1 and the other electrical device N2 of the adjacent electrical devices, and a voltage stabilization device M1 is provided.

[0010] Similarly, one winding and the other winding of two windings having a turns ratio of 1, which are connected in parallel to adjacent electrical devices N2 and N3 and are connected so as to cancel each other's magnetic fields, are connected to the connection point between one electrical device N2 and the other electrical device N3 of the adjacent electrical devices, and a voltage stabilization device M2 is provided.

[0011] Similarly, one end of a voltage stabilizing device M3 is provided, which is connected in parallel to adjacent electrical devices N3 and N4 and is configured by connecting the connection point between one winding and the other winding having a winding ratio of 1, which are connected so as to cancel each other's magnetic fields, to the connection point between one of the adjacent electrical devices N3 and the other electrical device N4.

[0012] (When the circuit configurations of each electrical device are the same and the ratings of each electrical device are different) As shown in FIG. 5, in a configuration in which a power supply voltage is applied to a plurality of electrical devices A and B that are connected in series and have different ratings, the electrical devices A and B are connected in parallel and are connected so as to cancel each other's magnetic fields, and the connection point between one winding and the other winding having the same winding ratio of 3 as the rating ratio (150 / 50) of the adjacent electrical devices is connected to the connection point between one of the adjacent electrical devices A and the other electrical device B, thereby forming a voltage stabilizing device X.

[0013] The voltage stabilizing device of the present invention is a voltage stabilizing device that is connected to an AC power supply and stabilizes the voltage applied by dividing the voltage across two electrical devices having the same circuit configuration and connected in series. One end of a voltage stabilizing device M3 is provided, which is connected in parallel to adjacent electrical devices N3 and N4 and is configured by connecting the connection point between one winding and the other winding having a winding ratio of 1, which are connected so as to cancel each other's magnetic fields, to the connection point between one of the adjacent electrical devices N3 and the other electrical device N4.

[0014] The electrical device system of the present invention is an electrical device system that includes two electrical devices having the same circuit configuration and connected in series to an AC power supply, and a voltage stabilizing device that stabilizes the voltage applied by dividing the voltage across the two electrical devices. The voltage stabilizing device is configured by connecting the connection point between one winding and the other winding having a winding ratio of 1, which are connected in parallel to the two electrical devices and are connected so as to cancel each other's magnetic fields, to the connection point between one of the two electrical devices and the other electrical device.

[0015] According to the above configuration, even when the voltage supplied from the power system is not evenly divided between two electrical devices due to differences such as load characteristics, the voltage at the midpoint of the winding constituting the voltage stabilizing device is self-adjusted to half the potential of the power supply voltage. Therefore, even if the voltage of one of the electrical devices increases, the magnetic field of the winding changes in the direction in which the voltage does not increase, and thereby a desired voltage division is performed for the two electrical devices.

[0016] In the above configuration, the electrical device is connected to an AC power supply having a voltage approximately twice the rated voltage of the electrical device. Also, in the above configuration, the electrical device is a linear amplifier.

[0017] According to the above configuration, it becomes possible to connect and use a linear amplifier for amateur radio rated at 100 volts to a 200-volt power supply. Therefore, the outputs of the linear amplifiers can be combined to obtain twice the output with a linear amplifier rated at 100 volts.

[0018] In the above configuration, an incandescent lamp may be used as the electrical device.

[0019] According to the above configuration, a voltage divided as desired can be applied to two incandescent lamps.

Effect of the Invention

[0020] According to the present invention, even when the voltage supplied from the power system is not evenly divided between two electrical devices due to differences such as load characteristics, the voltage at the midpoint of the winding constituting the voltage stabilizing device is self-adjusted to half the potential of the power supply voltage. Therefore, even if the voltage of one of the electrical devices increases, the magnetic field of the winding changes in the direction in which the voltage does not increase, and thereby a desired voltage division is performed for the two electrical devices. Thus, a rated voltage can be stably supplied to the electrical device.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0023] FIG. 1 is a diagram showing the configuration of an electrical equipment system provided with a voltage stabilizing device according to the present invention. The electrical equipment system 100 includes two electrical equipment 101 and 103 having the same circuit configuration connected in series, and a voltage stabilizing device 150 connected in parallel to the electrical equipment 101 and 103.

[0024] The voltage stabilizing device 150 includes two windings 151 and 153 connected so as to cancel each other's magnetic fields, and a connection portion 155 between the winding 151 and the winding 153 is connected to a connection portion 105 between the electrical equipment 101 and the electrical equipment 103. The number of turns of the windings 151 and 153 of the voltage stabilizing device 150 is equal to each other, thereby constituting a transformer with a turns ratio of 1.

[0025] Hereinafter, the operation when an AC power supply is connected to the electrical equipment system 100 and an AC voltage of 200 volts is applied will be described. The voltage of the AC 200 volts applied to the electrical equipment system 100 is divided according to the loads of the electrical equipment 101 and 103 connected in series. Since the circuit configurations of the electrical equipment 101 and 103 are the same as each other, the voltages applied to the electrical equipment 101 and 103 are equal if the load characteristics are the same.

[0026] In addition, the AC voltage of 200 volts applied to the electrical equipment system 100 is divided between winding 151 and winding 153, and the voltage at the connection part 155 between winding 151 and winding 153 is self-adjusted to maintain a potential of 100 volts, which is half of the applied voltage.

[0027] Even if the electrical equipment 101 and 103 have the same circuit configuration, if their respective load characteristics are different, the voltages divided according to their respective loads are applied. For example, when the load of the electrical equipment 101 is larger than that of the electrical equipment 103, the voltage applied to the electrical equipment 101 increases.

[0028] At this time, the voltage stabilizer 150 connected to the connection part 105 between the electrical equipment 101 and the electrical equipment 103 operates so that the magnetic field changes in a direction where the voltage does not increase, and the potential at the connection part 155 between winding 151 and winding 153 is maintained at 100 volts. Thereby, the voltage applied to the electrical equipment 101 is adjusted, and it operates so that the voltages applied to the electrical equipment 101 and the electrical equipment 103 become equal.

[0029] Even when the electrical equipment 101 and 103 with a rating of 100 volts are connected to an AC power supply of 200 volts AC, the divided 100 volts can be applied to the electrical equipment 101 and 103.

[0030] The electrical equipment system 100 shown in FIG. 1 has been described for the case where the ratings of each electrical equipment are the same. However, when the ratings of each electrical equipment are different, the rating ratio and the winding ratio of each electrical equipment are configured to be equal.

[0031] For example, in the case of a rating ratio of 3 where the rating of the electrical equipment 101 is a voltage of 150 volts and a current of 1 ampere and the rating of the electrical equipment 103 is a voltage of 50 volts and a current of 1 ampere, the winding ratio of the voltage stabilizer 150 is a winding ratio of 3, which is composed of winding 151 having three times the number of windings with respect to the number of windings of winding 153.

[0032] In addition, although the electrical equipment system 100 shown in FIG. 1 has been described for the case where two electrical equipment are connected in series, it is also possible to configure by connecting more electrical equipment in series. For example, in a configuration where four electrical equipment are connected in series, the configuration described in FIG. 1 may be applied to the electrical equipment adjacent to each other.

[0033] That is, for the first to fourth electrical equipment connected in series, a first voltage stabilizing device is connected in parallel to the adjacent first and second electrical equipment, a second voltage stabilizing device is connected in parallel to the adjacent second and third electrical equipment, and a third voltage stabilizing device is connected in parallel to the adjacent third and fourth electrical equipment, and the first to third voltage stabilizing devices are configured to be connected in series respectively (see FIG. 4).

[0034] In addition, although the electrical equipment system 100 shown in FIG. 1 has been described for the case where the ratings of two electrical equipment are the same, it is also possible to configure with different ratings of the two electrical equipment. For example, when an electrical equipment with a rating of 150 volts and 1 ampere and an electrical equipment with a rating of 50 volts and 1 ampere are connected in series, the turns ratio of the voltage stabilizing device is selected to be the same as the rating ratio (150 / 50) of the above two electrical equipment, which is 3 (see FIG. 5).

[0035] Note that the AC power supply for supplying an AC voltage to the electrical equipment system 100 includes, in addition to the power grid, a diesel generator, a gasoline generator, a gas generator, etc., and any type of AC power supply can be used as long as it can supply a voltage approximately twice the rated voltage of the electrical equipment.

[0036] The voltage stabilizing device 105 according to the present invention includes a connection portion that functions as a receptacle to which the cable plugs provided on the electrical equipment 101 and 103 are connected, and is configured to connect the cable plugs of the electrical equipment 101 and 103 to the two connection portions respectively.

[0037] The electrical devices 101 and 103 that make up the electrical device system 100 include a linear amplifier, an incandescent bulb, an electric motor, a transformer, etc. Any type of device can be used as long as it is driven by an AC power supply and is composed of the same circuit.

[0038] (Example 1) Figure 2 shows a case where the electrical device that makes up the electrical device system according to the present invention is an amateur-only linear amplifier. Since the voltage stabilizer 250 has the same configuration as the voltage stabilizer 150 shown in Figure 1, detailed description thereof will be omitted.

[0039] When a linear amplifier rated at 100 VAC is connected to 200 VAC, electrical elements such as FETs in the amplifier circuit after the rectifier circuit for generating DC voltage may be damaged due to overvoltage or malfunction may occur.

[0040] Although it is common to step down the voltage to correspond to 200 V, the miniaturization of the device is impaired and the price of the device increases. Therefore, linear amplifiers rated at 100 V are connected in series and connected to a 200 VAC power supply so that 100 V, which is divided voltage for each linear amplifier, is applied.

[0041] In the electrical device system 200 shown in Figure 2, the electrical devices 201 and 203 are linear amplifiers (model number DXV-300 manufactured by Samway) rated at 100 V each, and are connected in series to a 200 VAC power supply. In the above configuration, if the loads of the two linear amplifiers having the same circuit configuration are the same, the voltage applied to each linear amplifier is 100 V each.

[0042] However, if the loads of the two linear amplifiers are different, the voltage cannot be divided as desired. Specifically, due to variations in the characteristics of the electrical elements mounted on the linear amplifier and tolerance variations in adjustment during manufacturing, the input voltage to the linear amplifier is not evenly divided.

[0043] For example, when the load of the linear amplifier of the electrical device 201 is 1.1 times that of the load of the linear amplifier of the electrical device 203, the input voltage divided by the linear amplifier of the electrical device 201 is 104.76 volts (200×1.1 / (1.1 + 1.0)), and the input voltage divided by the linear amplifier of the electrical device 203 is 95.24 volts, which is unevenly divided. As a result, the electrical device 201 may have problems due to overvoltage, and the electrical device 203 may malfunction due to voltage shortage.

[0044] Also, when the signals input to the two linear amplifiers are different, since the voltages of the input signals to the two linear amplifiers at a certain moment are different, a difference occurs in the power of the amplified signals, and the apparent load of the linear amplifier at that time changes, resulting in non-uniform input voltages.

[0045] According to this embodiment, since the voltage at the midpoint of the two windings constituting the voltage stabilizing device 250 is self-adjusted to always be maintained at half the potential of the voltage applied to the entire winding, when the load of the linear amplifier of the electrical device 201 is large and the voltage division to the rectifier circuit of the linear amplifier increases, the voltage stabilizing device 250 operates so that the magnetic field changes in a direction where the voltage division does not increase and the potential at the midpoint is maintained at 100 volts.

[0046] Also, when the loads of the two linear amplifiers are different due to manufacturing variations or the like, or when the signal voltages input to the two linear amplifiers are different, the output voltages of the respective linear amplifiers are different, and the apparent load changes, the voltage stabilizing device 250 operates so that the voltages applied to the bridges of the rectifier circuits constituting the linear amplifiers are equal, thereby preventing device failures and malfunctions due to over- or under-voltage of the input voltage.

[0047] (Embodiment 2) FIG. 3 shows a case where the electrical device constituting the electrical device system according to the present invention is an incandescent lamp. Since the voltage stabilizing device 350 has the same configuration as the voltage stabilizing device 150 shown in FIG. 1, detailed description thereof is omitted.

[0048] Incandescent bulbs do not have exactly the same resistance value due to variations in the filament, etc., and there is some individual variation. Also, when the power is turned on, the energized filament generates heat and its temperature rises, so the filament exhibits an overshoot due to thermal resistance.

[0049] When incandescent bulbs having such properties are connected in series, a larger voltage is divided across the filament with the higher resistance value, causing the thermal resistance to increase, and thereby a larger voltage is applied. When an electrical device such as an incandescent bulb having a positive temperature coefficient of resistance (PTC) is connected to a power supply, an overshoot of the applied voltage always occurs when the power is turned on.

[0050] The overshoot of the input voltage when the power is turned on causes problems such as variations in the brightness when two serially connected incandescent bulbs are lit and a shorter lifespan of the filament with the higher impedance in the case of incandescent bulbs.

[0051] After the power is turned on and a while has passed to reach an equilibrium state, this problem becomes less significant. However, in applications where the incandescent bulb is used with flashing or frequently turned on and off, an overvoltage is constantly applied to the filament. For this reason, there are problems such as a shorter lifespan of the filament, frequent replacement of the incandescent bulb, and an increase in operating costs.

[0052] In FIG. 3, electrical devices 301 and 303 are incandescent bulbs having the same circuit configuration with a rating of 100 volts each, and are connected in series to an AC 200 - volt power supply. In the above configuration, if the load states of the two incandescent bulbs are the same, the voltage applied to each incandescent bulb is 100 volts respectively.

[0053] However, if the two load states are different, voltage division cannot be achieved as desired. Specifically, due to variations in the characteristics of the filaments, the input voltages of the filaments are not equal. For example, if the resistance Rc of the filament of electrical device 301 is greater than the resistance Rd of the filament of electrical device 303, the voltage divided across the incandescent bulb of electrical device 301 and the voltage divided across the incandescent bulb of electrical device 303 will be non-uniform.

[0054] When the power is turned on in this state, a higher power (I2×Rc) is input to the incandescent bulb of electrical device 301, resulting in a larger amount of heat generation. This causes the thermal resistance to increase, and an even higher voltage is applied to electrical device 301.

[0055] According to this embodiment, since the voltage at the midpoints of windings 151 and 153 of voltage stabilizer 150 is self-adjusted to always be maintained at half the potential of the voltage applied across the entire winding, when the resistance of the filament of the incandescent bulb of electrical device 301 is large and the voltage division across the filament of the incandescent bulb of electrical device 301 increases, voltage stabilizer 150 operates such that the magnetic field changes in a direction to prevent the voltage division from increasing, and the midpoint potential is maintained at 100 volts.

[0056] According to this embodiment, even if the resistance of the filaments of the two incandescent bulbs differs due to manufacturing variations or other factors, or if the voltage applied to each incandescent bulb changes due to an increase in thermal resistance caused by a difference in the amount of heat generated by the two incandescent bulbs, voltage stabilizer 150 operates such that the voltages applied to the two incandescent bulbs are equal, thereby avoiding a reduction in the lifespan of the filaments of the incandescent bulbs.

Industrial Applicability

[0057] It can be used for electrical devices powered by power supplies with different ratings.

Explanation of Reference Numerals

[0058] 100, 200, 300 Electrical device system 101, 103 Electrical devices 105 Connection point 150, 250, 350 Voltage Stabilization Devices 151, 153 Windings 155 Connection Points 201, 203 Electrical Equipment (Linear Amplifier) 301, 303 Electrical Equipment (Incandescent Lamp) N1~N4, A, B Electrical Equipment M1~M3, X Voltage Stabilization Devices

Claims

1. A voltage stabilizing device that is connected to an AC power supply and stabilizes the voltage applied by voltage division to two electrical devices having the same circuit configuration and connected in series, wherein one winding and the other winding of two windings having a winding ratio of 1, which are connected in parallel to the two electrical devices and are connected so as to cancel each other's magnetic fields, are connected at a connection point between one electrical device and the other electrical device of the two electrical devices. A voltage stabilizing device connected to the connection point.

2. An electrical equipment system comprising two electrical devices having the same circuit configuration and directly connected to an AC power supply, and a voltage stabilizing device that stabilizes the voltage applied by voltage division to the two electrical devices, wherein the voltage stabilizing device is An electrical equipment system configured by connecting a connection point between one winding and the other winding of two windings having a winding ratio of 1, which are connected in parallel to the two electrical devices and are connected so as to cancel each other's magnetic fields, to a connection point between one electrical device and the other electrical device of the two electrical devices.

3. The electrical equipment system according to claim 2, wherein the electrical equipment is connected to an AC power supply having a voltage approximately twice the rated voltage of the electrical equipment.

4. The electrical equipment system according to claim 2 or 3, wherein the electrical equipment is a linear amplifier.

5. The electrical equipment system according to claim 2 or 3, wherein the electrical equipment is an incandescent lamp.

6. An electrical equipment system comprising a plurality of electrical devices having the same circuit configuration and connected in series to an AC power supply, and one or a plurality of voltage stabilizing devices connected in series that stabilize the voltage applied by voltage division to the plurality of electrical devices, wherein the voltage stabilizing device is An electrical equipment system configured by connecting a connection point between one winding and the other winding of two windings, one of which is connected in parallel to two adjacent electrical devices and is connected so as to cancel each other's magnetic fields, to a connection point between one electrical device and the other electrical device of the adjacent electrical devices.

7. The plurality of electrical devices have equal ratings for each electrical device, The electrical equipment system according to claim 6, wherein the voltage stabilizing device has a winding ratio of 1 between one winding and the other winding.

8. The plurality of electrical devices have different ratings for each electrical device, The electrical equipment system according to claim 6, wherein the voltage stabilizing device has a winding ratio between one winding and the other winding that is the same as the rating ratio of the electrical equipment.

Images