JPH09325823A - Load device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle a power for test by a method for returning the power for test to the input side of a power supply device to be tested or an original power supply while driving a constant current or a constant resistor to be a load by an auxiliary power supply or an inverter in order to reuse the power for test being wasted in a conventional method. SOLUTION: The power supply 1 is connected to the input of the power supply device 3 to be tested and the auxiliary power supply 2 is connected to the output terminal side of the device 3 to adjust the output current I1 of the device 3 while executing power feedback by holding voltage balance with the power supply 1 so that a voltage difference between the voltage of the power supply 1 and the output voltage of the power supply 2 is impressed to an impedance element Z. The inverter for converting frequency or converting DC into AC is connected to the output side of the device 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transformer, a DC power source,
The present invention relates to a load device for testing any power supply device such as an AC power supply and a battery.

[0002]

2. Description of the Related Art A conventional load device consumes only electric power and does not consider recycling of electricity.

[0003]

Therefore, according to the present invention, in order to reuse the test power which has been conventionally discarded, the test power is supplied to the power source device under test while performing constant current or constant resistance operation as a load. The purpose is to make it possible to recycle the test power by returning it to the input side or the original power source, contribute to energy saving, and bring about economic effects in various fields.

[0004]

A load device according to the present invention (a first invention according to claim 1) provides a power supply to a power source device under test connected to a power source, and a voltage balance with the power source. While the auxiliary power source connected to the output terminal of the power source device under test for adjusting the output current of the power source device under test, a voltage difference between the voltage of the power source and the output voltage of the auxiliary power source is applied. And an impedance element connected to.

A load device according to the present invention (a second invention according to claim 2) comprises an output terminal of the power supply device under test described in the first invention according to claim 1 and an input terminal of the auxiliary power supply. An inverter for the purpose of frequency conversion or DC to AC conversion is inserted between them.

[0006]

The principle of the load device according to the first aspect of the present invention will be described with reference to the drawings. FIG. 1- (a) shows a conventional load, and all the electric power supplied to the load is consumed and the reuse of electricity is not considered. FIG. 1- (b) relates to the load device of the first aspect of the invention, and the test power E1 × I of the power supply 3 under test.
1 is returned to the input side of the power supply 3 under test through the auxiliary power supply 2 and the impedance Z. The test current I1 is {E0-
(E1-E2)} / Z or {E0- (E1 + E2)}
It is given by / Z and can be adjusted by the voltage E2. FIG. 1- (c) also relates to the load device of the first invention, in which the test power E1 × I1 of the power source under test 3 is converted into E2 × I3 by the auxiliary power source 2 and is input to the input side of the power source under test 3 through the impedance Z. Will be returned. The test current I1 is
The voltage E given by {(E0-E2) / Z} × E1 / E2
2 can be adjusted.

The load device of the second invention having the above structure is
Since the inverter 4 for the purpose of frequency conversion or conversion of direct current into alternating current is installed on the output side of the power source under test 3, even if the voltage of the power source under test is direct current, the same effect as the load device of the first invention can be obtained. can get. Even when the voltage of the power supply 3 to be tested is AC, each transformer can be made small by directly converting the AC voltage into a high frequency voltage without converting the AC voltage into a DC voltage with an inverter composed of an AC switch. FIG. 1- (d) relates to the load device of the second aspect of the invention, in which the DC test power E1 × I1 is converted into AC power E3 × I3 by the inverter 4 and the auxiliary power source 2 and the impedance Z of the power source 3 under test are used. It is returned to the input side. The test current I1 is {E0- (E3-E2)} / Z or {E0-
It is determined by (E3 + E2)} / Z and can be adjusted by the voltage E2. FIG. 1- (e) relates to the load device of the second invention when the power source 3 to be tested is a battery, and the test power E1 × I1 of the battery 5 is E3 × of the AC power in the inverter 4.
It is converted to I0 and regenerated as a commercial power source through the auxiliary power source 2 and the impedance Z. The test current I1 is {E0-
(E3-E2)} / Z or {E0- (E3 + E2)}
Although it can be adjusted by / Z and adjusted by the voltage E2, the auxiliary power supply 2 can be omitted when the output voltage E3 is varied by the inverter itself.

[0008]

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

(First Embodiment) The load device of the first embodiment is
As shown in FIG. 2- (a), which is an embodiment of the first invention, the power source 1 is connected to the input of the power source device 3 under test, and the power source device 3 under test is fed back while maintaining a voltage balance with the power source 1. Output of the auxiliary power supply 2 consisting of the voltage E0 of the power supply 1 and the series transformer T1 by connecting the secondary side of the series transformer T1 as an auxiliary power supply to the output terminal of the power supply device under test 3 in order to adjust the output current I1 of The impedance element Z is connected so that a voltage having a difference of the voltage E3 is applied.

The load device of FIG. 2- (a) is an embodiment of the principle explanatory diagram of FIG. 1- (b), and in the circuit configuration of FIG. 2- (a), the power supply current I0 becomes the test current I1 depending on the conditions. This is much smaller than the above, and a predetermined test can be performed only with the power consumption of the circuit loss of all devices. 2 of transformer T1 for auxiliary power supply
The next voltage is E2, the number of turns of the primary winding of the transformer T1 is N1, 2
The number of turns of the next winding is N2, and the winding ratio of the transformer T1 is a = N1 /
N2, the output voltage of the power supply unit under test is E1, the power supply voltage is E
When set to 0, the output current I1 of the power supply device under test is given by the following equation. I1 = (E1 + E2-E0) / Z = (E1 + E0 / a-E0) / Z = {E1 + (1 / a-1) * E0} / Z where E2 = E0 / a From this formula, the output of the power supply device under test It can be seen that the current I1 can be adjusted by the voltage E2 or the winding ratio a regardless of the output voltage E1 of the power supply device under test. Further, the effective winding ratio a can be varied by switching the tap of the transformer T2, changing the combination of windings, or sliding. As another embodiment, the same effect can be obtained when the primary winding of the series transformer T1 is connected to the external auxiliary power source 6 as shown in FIG. As another embodiment, the same effect can be obtained by using the configuration shown in FIG. The load device shown in FIG. 3 is the same as the load device shown in FIG.
In the circuit configuration of FIG. 3- (a), the transformer T2 is changed by tapping the auxiliary power transformer T2, changing the combination of windings, or adjusting the effective winding ratio by a sliding method. The voltage I2 is changed to adjust the current I1. I1 is given by the following equation. I1 = (E2 / E1) × I3 = (E2 / E1) × (E2
-E0) / Z Even in this circuit configuration, the power supply current I0 becomes extremely smaller than the test current I1 depending on the conditions, and the predetermined test can be performed only by the power consumption of the circuit loss of all the devices. Figure 3-
Similar effects can be obtained by using an autotransformer as the auxiliary power supply 2 as shown in (b). As another example, FIG. 4 shows a load device when a transformer is tested. Figure 4-
(A) shows the case where there is one transformer under test, and in the case of FIG. 4- (b) and FIG. 4- (c), the secondary side and the secondary side of the two transformers under test T4 are connected to each other. The combined transformer 7 can be efficiently tested as one transformer under test. In this case, a plurality of transformers 7 may be connected in cascade to test and age a plurality of transformers at the same time. The composite transformer 7 may be one in which the primary side and the primary side of two transformers under test T4 are connected to each other. Further, the two transformers used for the composite transformer 7 can obtain similar effects even if they are not the same. The same effect can be obtained as a single-phase three-wire power supply, a three-phase four-wire power supply, or a load device for a three-phase power supply.

(Second Embodiment) A load device according to the second embodiment is
It is an embodiment of the second invention, and as shown in FIG. 5, an inverter 4 for the purpose of frequency conversion or conversion of direct current to alternating current is installed on the output side of the power source 3 under test of the first invention. Is.

Even if the power source device 3 to be tested is a direct current, it is converted into an alternating current by the inverter 4, so that the same effect as the load device of the first invention can be obtained. Further, even when the power supply device 3 to be tested is an alternating current, each transformer can be made small by directly converting the alternating current voltage into a high frequency voltage without converting it into a direct current by an inverter composed of an alternating current switch. As another embodiment, as shown in FIG.
Even if the auxiliary power supply 2 of FIG. 5 (a) is omitted by providing a voltage control function to the above, the same effect can be obtained. As another embodiment, when the power source 3 to be tested is a battery as shown in FIG. 6- (b), the test power E1 × I1 of the battery 5 is AC power E by the inverter 4.
It is converted to 3 × I0 and regenerated to a commercial power source through the impedance Z. It can also be used as an independent power source equivalent to a commercial power source. The test current I1 is (E0-
It is determined by E3) / Z and can be adjusted by the output voltage E3 of the inverter. Further, according to this method, electric power obtained from various physical phenomena such as solar cells, fuel cells, thermoelectric conversion, piezoelectric conversion, wind power generation, wave power generation can be regenerated to a commercial power source or used as an independent power source. .

According to the first and second aspects of the invention, the auxiliary power source or the inverter is used to consume most of the test power of the power supply unit under test without inputting the test power of the power supply unit under test. Alternatively, since the power is regenerated to the original power source, a load device capable of reusing electricity can be configured.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a principle of a load device according to a first invention.

FIG. 2 is a circuit diagram showing an embodiment of a load device according to the first invention.

FIG. 3 is a circuit diagram showing another embodiment of the load device according to the first invention.

FIG. 4 is a circuit diagram showing an embodiment of a load device according to the first invention.

FIG. 5 is a circuit diagram showing an embodiment of a load device according to a second invention.

FIG. 6 is a circuit diagram showing another embodiment of the load device according to the second invention.

[Explanation of symbols]

1 and 2 are AC or DC power sources 3 are AC or DC power sources to be tested 4 are inverters or frequency converters 5 are batteries or solar cells, fuel cells, thermoelectric conversion and piezoelectric conversion, wind power generation, wave power generation, and other physical phenomena AC power supply 6 is an AC power supply 7 is a transformer consisting of two transformers whose primary side and primary side or secondary side and secondary side are connected to each other. , T4 is a transformer with a fixed turn ratio, or a transformer with adjustable taps or a combination of windings or a sliding type whose effective turn ratio can be adjusted. Z is a resistor, a capacitor, or a reactor.

Claims (2)

[Claims] 1. A power supply device under test having an input terminal connected to a power supply; and a power supply device under test for adjusting an output current of the power supply device under test while feeding back power while balancing the voltage with the power supply. A load device, comprising: an auxiliary power supply connected to an output terminal of the power supply; and an impedance element connected so that a voltage having a difference between a voltage of the power supply and an output voltage of the auxiliary power supply is applied. 2. An object of the present invention is to convert frequency or convert direct current into alternating current between the output terminal of the power source device under test described in the first aspect of the present invention and the input terminal of the auxiliary power source. A load device in which an inverter is inserted.