JP2827188B2 - Power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device connected to the output of a DC power generation device such as a fuel cell having a relatively high output impedance and capable of supplying stable power to a load.

[0002]

2. Description of the Related Art Conventionally, a power supply unit connected to a DC power generator such as a fuel cell and supplying stable power to a load detects only an output voltage and compares the output voltage with a reference output voltage source. Then, the output error voltage is amplified, and this is used as a control signal to control the power supplied to the load.

FIG. 8 shows a configuration of a conventional power supply device. In the figure, A is a conventional power supply device, 1 is a DC power generation device such as a fuel cell, 2 is a load, 3 is a main circuit / control circuit, 4 and 5 are output voltage dividing resistors, 6 is an output error voltage amplifier, 7 is a reference output voltage source.

The output of the DC power generator 1 is connected to the input of the power supply A, and the output of the power supply A is connected to the load 2. The main circuit / control circuit 3 is composed of a dropper circuit or a switching power supply circuit. The DC power generated by the DC power generator 1 is converted into an output voltage V by the power supply A.
is controlled and supplied to the load 2 as stable DC power.

The output voltage Vo of the main circuit / control circuit 3 of the power supply A is divided by output voltage dividing resistors 4 and 5 having resistance values R1 and R2, respectively, and an output detection voltage Vos (= R
2 / (R1 + R2) .Vo) and input to the inverting input of the output error voltage amplifier 6. On the other hand, the reference output voltage source 7
Is input to the non-inverting input of the output error voltage amplifier 6. The two voltages Vos and Vor input to the output error voltage amplifier 6 are differentially amplified to become a differential amplification control signal S, which is input to the control input of the main circuit / control circuit 3 to perform feedback control of the output voltage Vo.

When the output voltage Vo rises, the output detection voltage V
os rises, the differential amplification control signal S of the output error voltage amplifier 6 decreases, and is input as a control input of the main circuit / control circuit 3. Therefore, when the main circuit and control circuit 3 is configured by a dropper circuit, the output voltage Vo is suppressed, and when the main circuit and control circuit 3 is configured by a switching circuit, the duty ratio of the switching pulse is reduced to lower the output voltage Vo.

Conversely, when the output voltage Vo decreases, the output detection voltage Vos decreases, and the differential amplification control signal S of the output error voltage amplifier 6 increases, so that the output voltage Vo functions to increase. Since the conventional power supply device A is configured as described above, it is possible to supply stable power to the load 2 according to the fluctuation of the output voltage Vo.

[0008]

However, in the conventional power supply device A, no consideration is given to the characteristics of the DC power generator 1 used as a power supply source. Therefore, when a storage battery, a fuel cell, or the like having a relatively high output impedance and having a large characteristic deterioration such as a decrease in output capacity due to overload or aging is used as the DC power generator 1, the conventional power supply device A Since a decrease in the output capacity of the DC power generator 1 due to these causes cannot be detected, the DC power generator 1 is overloaded with power greater than the output capacity, and the characteristic deterioration of the DC power generator 1 is further increased, or There is a drawback that the power supply from the DC power generator 1 is stopped or the DC power generator 1 is damaged.

When the power supply A is stopped due to an overload, the output is lost, so that the output voltage of the DC power generator 1 increases, and the power supply A is ready to start operation again. Since the output cannot be supplied, there is a problem that the operation and the stop are intermittently repeated.

Further, when a converter is connected as the load 2, since the converter is generally formed of a solid-state semiconductor, if the output power Po of the power supply A decreases, the converter sharply decreases the input power. However, there is a problem that the control operation cannot be performed and the operation stops instantaneously. It is an object of the present invention to provide a power supply device capable of detecting and controlling a characteristic change of a DC power generation device having a specific characteristic such as a fuel cell and responding to the change.

[0011]

The above object is achieved by the present invention employing the following novel characteristic constitution means. That is, a first feature of the present invention is that in a power supply device connected to the output of a DC power generation device such as a fuel cell to supply stable power to a load, a main circuit and control circuit, and the main circuit and control circuit An output detection voltage is compared with a reference output voltage, an output error voltage amplifier circuit that amplifies the difference voltage and supplied to the main circuit / control circuit is compared with an input detection voltage of the main circuit / control circuit and a reference input voltage. A power supply apparatus comprising: an input error voltage amplifier circuit; and a reference output voltage control circuit that changes the reference output voltage when an input detection voltage is lower than a reference input voltage.

A second feature of the present invention resides in a power supply device connected to an output of a DC power generation device such as a fuel cell for supplying stable power to a load. An output error voltage amplifier circuit that compares the output detection voltage of the control circuit with the reference output voltage, amplifies the difference voltage, and supplies the amplified voltage to the main circuit / control circuit; Compare the reference input voltage
A power supply device comprising: an output voltage control circuit that changes the reference output voltage when an input current is larger than a set current value.

A third feature of the present invention resides in a power supply device connected to the output of a DC power generation device such as a fuel cell for supplying stable power to a load. An output error voltage amplifier circuit for comparing the output detection voltage of the control circuit with the reference output voltage, amplifying the difference voltage and supplying the amplified difference voltage to the main circuit / control circuit; and the input detection voltage and the reference input voltage of the main circuit / control circuit A first input error voltage amplifier circuit for comparing the input current of the main circuit and control circuit with a reference input voltage corresponding to the first input error voltage amplifier circuit; A power supply device comprising: a reference output voltage control circuit that changes the reference output voltage when either one of the case where the input current is lower and the case where the input current is larger than the set current value or both of the cases.

According to a fourth feature of the present invention, the output error voltage amplifier circuit according to the first, second or third feature generates an output voltage dividing resistor for detecting an output detection voltage and a reference output voltage. The power supply device includes a reference output voltage source and an output error voltage amplifier that amplifies a difference between these two voltages.

A fifth feature of the present invention is that the first, second, and
The input error voltage amplifying circuit according to the third or fourth aspect,
The power supply device includes an input voltage dividing resistor for detecting an input detection voltage, a reference input voltage source for generating a reference input voltage, and an input error voltage amplifier for differentially amplifying these two voltages.

A sixth feature of the present invention is that the first, second,
The reference output voltage control circuit according to the third, fourth or fifth feature is a power supply device comprising a control voltage dividing resistor for changing a reference output voltage according to an output voltage of an input error voltage amplifier, and a clamp diode. .

[0017] A seventh feature of the present invention is the second or fourth aspect.
The input error voltage amplifying circuit converts the input current to an input detection voltage and detects the input current, a reference input voltage source that generates a reference input voltage, and an input error voltage that differentially amplifies these two voltages. This is a power supply device including an amplifier.

An eighth feature of the present invention is the third or fourth aspect.
A first input error voltage amplifying circuit having the characteristics described above, wherein an input voltage dividing resistor for detecting an input detection voltage, a reference input voltage source for generating a reference input voltage, an input error voltage amplifier for differentially amplifying these two voltages, and A second input error voltage amplifier circuit converts an input current into an input detection voltage and detects the input current; a reference input voltage source that generates a reference input voltage; A control voltage dividing resistor comprising an input error voltage amplifier for amplifying, and a reference output voltage control circuit for changing a reference output voltage according to respective output voltages of the first and second input error voltage amplifier circuits. And a clamp diode of each of the first and second input error voltage amplifiers.

Alternatively, a ninth feature of the present invention is that the main circuit / control circuit in the first, second, third, fourth, fifth, sixth, seventh or eighth feature is connected. This is a power supply device in which an inverter for converting DC power into AC power is interposed immediately after a branch point between an output voltage dividing resistor between loads and a branch point.

[0020]

According to the present invention, when the output capacity is reduced due to aging or overload of the fuel cell or the like used in the DC power generator, the input voltage becomes lower than the set voltage. Or, even if the input current increases beyond the set current, the power supply detects the input voltage or input current and reduces the output voltage while maintaining the output power of the power supply at a certain level or more. In addition to being able to make the best use, it is possible to detect a decrease in the capacity of the DC power generator by detecting a decrease in voltage at the load.

Further, even when a converter is connected as a load, the output voltage is reduced while the supplied power is kept at a certain value or more, so that the converter can detect a decrease in the input voltage and limit the output power. Become.

[0022]

【Example】

(First Embodiment) A first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIG.
FIG. 3 is a graph showing a correlation between a reference voltage of the output error voltage amplifier and an output voltage of the input error voltage amplifier in the same example, and FIG. 4 is an output power / output voltage-output current correlation characteristic diagram of the power supply device in the same example.

In the figure, A1 is a power supply device of this embodiment, 1 is a DC power generation device such as a fuel cell, 2 is a load, 3 is a main circuit and control circuit, 4 and 5 are output voltage dividing resistors, and 6 is an output. An error voltage amplifier, 7 is a reference output voltage source, 8 and 9 are input voltage dividing resistors, 10a is an input error voltage amplifier, 11a is a reference input voltage source, 12 and 13 are control voltage dividing resistors, and 14 is a clamp diode. is there. The same elements as those in the conventional example are denoted by the same symbols.

In the embodiment of the present invention shown in FIG. 1, the output of a DC power generator 1 such as a fuel cell is connected to the input of a power supply A1, and the output of the power supply A1 is connected to a load 2. The main circuit / control circuit 3 is composed of a dropper circuit or a switching power supply circuit.

In the power supply A1 of the present invention, the output error voltage amplifier circuit B includes output voltage dividing resistors 4 and 5 for detecting an output detection voltage Vos, a reference output voltage source 7 for generating a reference output voltage Vor, An output error voltage amplifier 6 amplifies the difference between these two voltages. The input error voltage amplifying circuit C generates input voltage dividing resistors 8 and 9 for detecting an input detection voltage Vis and a reference input voltage Vir. The reference output voltage control circuit D includes a reference input voltage source 11a and an input error voltage amplifier 10a that amplifies the difference between the two voltages. The reference output voltage control circuit D generates the reference output voltage Vcr according to the output voltage Vc of the input error voltage amplifier 10a. Control voltage dividing resistors 12 and 13 to be changed and a clamp diode 14 are provided.

The input detection voltage Vis (= R4 / (R3 + R4)) obtained by dividing the input voltage Vi of the power supply A1 of the present invention by the input voltage dividing resistors 8, 9 having resistance values R3, R4, respectively.
Vi) is input as the non-inverting input of the input error voltage amplifier 10a, and the reference input voltage Vir generated by the reference input voltage source 11a is input as the inverting input.

Since the specification of the present embodiment exhibits such a specific embodiment, when the input voltage Vi decreases, the input detection voltage Vis decreases, and the output voltage Vc of the input error voltage amplifier 10a decreases. The relationship between the output voltage Vc of the input error voltage amplifier 10a and the reference voltage Vcr of the output error voltage amplifier 6 is an initial value R6 / (R5 + R6) .V as shown in FIG.
or, and can be expressed by a straight line having a slope R5 / (R5 + R6). When the reference voltage Vcr of the output error voltage amplifier 6 changes, the output voltage Vo of the main circuit / control circuit 3 becomes Vcr · (R1 + R2) according to the change of the reference voltage Vcr of the output error voltage amplifier 6.
/ R2 linearly.

Therefore, the input voltage Vi changes to the set voltage value Vi '.
When the voltage drops below (= (R3 + R4) / R4 · Vir), the output voltage Vc of the input error voltage amplifier 10a decreases, and the reference voltage Vcr of the output error voltage amplifier 6 decreases, whereby the differential amplification control signal S The voltage is controlled by the difference amplification control signal S to control the voltage of the main circuit / control circuit 3 constituted by the dropper circuit or the switching power supply circuit, and the output voltage Vo is reduced.

FIG. 3 shows the relationship between the input voltage Vi or the output voltage Vo of the power supply A1 and the output current Io when the characteristics of the DC power generator 1 change. The power supply A1 has an output current I
Since the input power is small when o is small, the input voltage Vi
Is higher than the set voltage value Vi ′, and the output voltage Vo is controlled to be constant. However, as the output current Io increases, the power taken out of the DC power generator 1 increases, and the input voltage Vi of the power supply A1 decreases to the set voltage value Vi. When the voltage falls below, the output voltage Vo is reduced to suppress an increase in the output power of the power supply A1.

When the output characteristics of the DC power generator 1 are deteriorated due to deterioration or the like, the input voltage Vi of the power supply A1 reaches the set voltage value Vi 'when the output current Io is small, and the output voltage Vo decreases. start.

FIG. 4 shows the relationship between the output power Po or the output voltage Vo of the power supply A1 and the output current Io. As the output current Io increases, the output power Po of the power supply A1 increases.
Increases, but the output voltage of the DC power generator 1 decreases.
As the output power Po is taken, the input voltage V of the power supply A1
When i decreases and becomes equal to or less than the set voltage value Vi ′, the operation is performed to reduce the output voltage Vo. By increasing the gain of the input error voltage amplifier 10a, the input voltage Vi
, The output voltage Vo can be greatly reduced.

When the gain of the input error voltage amplifier 10a is increased, the output voltage Vo of the power supply A1 is reduced so that the input voltage Vi is kept constant at the set voltage value Vi '. The output power Po of the device A1 is kept constant. When the characteristics of the DC power generator 1 deteriorate and change from the solid line to the dotted line in FIG. 3, the value of the output current Io at which the output voltage Vo starts to decrease decreases, and the output power Po that can be extracted decreases.

(Second Embodiment) A second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a circuit configuration diagram showing the present embodiment, and FIG. 6 is a diagram showing an input current / output voltage-output current correlation characteristic diagram of the power supply device in the same example. In the following description, the same reference numerals are used for the same circuit elements as in the related art.
In the figure, A2 is the power supply device of the present embodiment, 10b is an input error voltage amplifier, 11b is a reference input voltage source, and 15 is an input current detection resistor.

In the power supply device A2 of the present invention, the output error voltage amplifying circuit B includes output voltage dividing resistors 4 and 5 for detecting an output detection voltage Vos, a reference output voltage source 7 for generating a reference output voltage Vor, The input error voltage amplifier circuit C ′ converts the input current Ii to the input detection voltage Vis ′ (=
R7 · Ii) input current detection resistor 15 for detection
And a reference input voltage source 1 for generating a reference input voltage Vir ′
1b, and an input voltage error amplifier 10b that amplifies the difference between these two voltages.
Is a control voltage dividing resistor 1 that changes the reference output voltage Vcr according to the output voltage Vc ′ of the input error voltage amplifier 10b.
2 and 13 and a clamp diode 14.

Since the specification of the present embodiment is such a specific embodiment, the input current Ii of the power supply A2 has a resistance value R
7 through the input current detection resistor 15, the voltage value Vis' (= R
7 · Ii). Assuming that the set current value is Ii ′, the voltage of the reference input voltage source is Vir ′ (= R7 · I
i ′), when the input current Ii becomes larger than the set current value Ii ′, the input error voltage amplifier 10b
Of the output voltage Vc ′ starts decreasing.

The output voltage V of the input error voltage amplifier 10b
When c ′ falls below the reference output voltage Vor, the reference voltage Vcr of the output error voltage amplifier 6 falls, the differential amplification control signal S decreases, and the main circuit / control circuit 3 outputs the output voltage Vo.
Act to lower the Therefore, as shown in FIG. 6, when the input current Ii becomes larger than the set current value Ii ′, the operation is performed so as to lower the output voltage Vo of the power supply A2.

By changing the gain of the input error voltage amplifier 10b, the rate of change of the output voltage Vo with respect to the change of the input current Ii can be adjusted. Input error voltage amplifier 1
By increasing the gain of 0b, the output voltage Vo is adjusted so that the input current Ii of the power supply A2 maintains the set current value Ii '.
Can be changed, so that the output power Po becomes constant even if the output current Io is increased.

(Third Embodiment) A third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 is a circuit diagram showing the present embodiment. In the following description, the same reference numerals are used for the same circuit elements as in the related art. In the figure, A3 is a power supply device of the present embodiment, and 14a and 14b are clamp diodes.

In the power supply device A3 of the present invention, the output error voltage amplifying circuit B includes output voltage dividing resistors 4 and 5 for detecting an output detection voltage Vos, a reference output voltage source 7 for generating a reference output voltage Vor, An output error voltage amplifier 6 amplifies the difference between these two voltages. The first input error voltage amplifying circuit Ca includes input voltage dividing resistors 8 and 9 for detecting an input detection voltage Vis, and a reference input voltage Vir. , And an input error voltage amplifier 10a that amplifies the difference between the two voltages. The second input error voltage amplifier circuit Cb converts the input current Ii to the input detection voltage Vis ′ (= R7 · Ii), an input current detection resistor 15 that detects the input current, a reference input voltage source 11b that generates a reference input voltage Vir ′, and an input voltage error amplifier 1 that amplifies the difference between these two voltages. b, the reference output voltage control circuit D ′ converts the reference output voltage Vcr according to the output voltage Vc of the first input error voltage amplifier 10a and the output voltage Vc ′ of the second input error voltage amplifier 10b. Control voltage dividing resistors 12 and 13 to be changed and clamp diode 1
4a and 14b.

Since the specification of the present embodiment shows such a specific embodiment, when the input voltage Vi of the power supply A3 falls below the set voltage value Vi ', the input error voltage amplifier 1
0a, the reference voltage Vcr of the output error voltage amplifier 6 decreases, and the differential amplification control signal S decreases. With the differential amplification control signal S, a main circuit constituted by a dropper circuit or a switching power supply circuit is used. The circuit and control circuit 3 performs voltage control and operates to lower the output voltage Vo. Therefore, when the input voltage Vi becomes lower than the set voltage value Vi ′, the operation is performed so as to lower the output voltage Vo of the power supply A3.

The input current Ii of the power supply A3 passes through the input current detection resistor 15 having a resistance value R7, and is converted into a voltage value Vis' from the potential difference between both ends of the input current detection resistor 15. By setting the voltage of the reference input voltage source to Vir ', when the input current Ii becomes larger than the set current value Ii', the output voltage V
c ′ begins to drop.

The output voltage V of the input error voltage amplifier 10b
When c ′ is lower than the reference output voltage Vor, the reference voltage Vcr of the output error voltage amplifier 6 is reduced, the differential amplification control signal S is reduced, and the main circuit and control circuit 3 outputs the output voltage Vcr.
It operates to lower o. Therefore, the input current Ii
Is larger than the set current value Ii ′, the output voltage Vo of the power supply device A3 is lowered. Therefore, in this embodiment, the input voltage Vi and the input current I
It is possible to control the power supplied to the load 2 by simultaneously detecting the change in i.

In the first, second, and third embodiments, the output voltages V of the power supply units A1, A2, and A3 are used.
Although the reference voltage Vcr of the output error voltage amplifier 6 is changed as a means for reducing o, the same effect can be obtained by changing the voltage dividing ratio of the output voltage dividing resistors 4 and 5 for detecting the output voltage Vo. It goes without saying that you can do it.

In the first, second and third embodiments, the case where the input and output of the power supply devices A1, A2 and A3 are not insulated has been described.
When the input and output of A1, A2 and A3 are electrically insulated, a transformer or the like is used to insulate the input and output of the main circuit and control circuit 3 from the connection branch point of the voltage dividing resistor. It is needless to say that the voltage or current can be detected by using a photocoupler or an insulating amplifier.

In the first, second and third embodiments, immediately after the branch point between the output of the main circuit and control circuit of the power supply units A1, A2 and A3 and the output detection voltage dividing resistor. Inverter α that converts DC power to AC power
Is connected, the power supply device can be applied to an AC load.

[0046]

As described above, according to the present invention, the input voltage or the input current of the power supply device is detected to lower the output voltage, thereby lowering the performance of the DC power generation device whose output capacity changes due to aging and the like. It is possible to extract the maximum output capacity without the need.

In particular, when a fuel cell or the like is used as a DC power generator, the maximum power capacity that can be taken out due to aging is reduced. However, it is possible to always supply the load with the maximum power by detecting a decrease in the maximum power capacity value. It is possible to use the maximum capacity at all times and exhibits excellent economic efficiency and efficiency.

The load can detect a drop in the power capacity of the DC power generator by detecting a drop in the voltage. Even when a converter is connected as the load, the output voltage is reduced while the supplied power is kept at the maximum. Therefore, power supply can be continued without stopping the converter.
Further, the converter exhibits excellent reliability and usefulness, for example, by detecting a drop in input voltage, thereby limiting output power and thereby preventing a power failure accident.

In addition, by connecting an inverter for converting DC power to AC power, not only DC power but also AC power can be supplied to the load. Regardless of the type of load, excellent versatility and usefulness can be obtained. Demonstrate the nature.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a power supply device A1 according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a correlation characteristic diagram of a reference voltage Vcr of the output error voltage amplifier 6 and an output voltage Vc of the input error voltage amplifier 10 in the above.

FIG. 3 is a correlation characteristic diagram of an input voltage Vi and an output voltage Vo versus an output current Io in the above power supply system.

FIG. 4 is a graph showing a correlation characteristic between output power Po and output voltage Vo and output current Io in the above power supply system.

FIG. 5 is a circuit configuration diagram of a power supply device A2 according to a second embodiment of the present invention.

FIG. 6 is a correlation characteristic diagram of an input current Ii / output voltage Vo-output current Io in the above power supply system.

FIG. 7 is a circuit configuration diagram of a power supply device A3 according to a third embodiment of the present invention.

FIG. 8 is a circuit configuration diagram of a power supply device A of a conventional example.

[Explanation of symbols]

 A, A1, A2, A3 ... power supply device B ... output error voltage amplifier circuit C, C '... input error voltage amplifier circuit Ca ... first input error voltage amplifier circuit Cb ... second input error voltage amplifier circuit D, D '... Reference output voltage control circuit 1 ... DC power generator 2 ... Load 3 ... Main circuit and control circuit 4,5 ... Output voltage dividing resistor 6 ... Output error voltage amplifier 7 ... Reference output voltage source 8,9 ... Input voltage Piezoresistors 10a, 10b Input error voltage amplifiers 11a, 11b Reference input voltage sources 12, 13 Control voltage dividing resistors 14, 14a, 14b Clamp diodes 15 Input current detection resistors Ii Input current of power supply device Ii ' ... Set current value Io ... Power supply device output current Po ... Power supply device output power S ... Difference amplification control signal Vc, Vc '... Input error voltage amplifier 10 output voltage Vcr ... Output error voltage amplifier 6 Reference voltage Vi: Input voltage of power supply device Vi ': Set voltage value Vir, Vir': Reference input voltage Vis, Vis': Input detection voltage Vo: Output voltage of power supply device Vor: Reference output voltage Vos: Output detection voltage α: Inverter

────────────────────────────────────────────────── ─── Continuation of the front page (72) Kumihito Tateda, Inventor Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo (56) References Patent 2787059 (JP, B2) (58) Fields investigated (Int.Cl. ⁶ , DB name) G05F 1/67 H02J 1/00 306 H02M 3/00-3/44

Claims (9)

(57) [Claims] A power supply device connected to an output of a DC power generation device such as a fuel cell for supplying stable power to a load, a main circuit / control circuit, an output detection voltage of the main circuit / control circuit and a reference output. An output error voltage amplifying circuit for comparing voltages and amplifying a difference voltage thereof and supplying the amplified voltage to the main circuit / control circuit; an input error voltage amplifying circuit for comparing an input detection voltage of the main circuit / control circuit with a reference input voltage; A reference output voltage control circuit for changing the reference output voltage when the input detection voltage is lower than the reference input voltage. 2. A power supply device connected to an output of a DC power generation device such as a fuel cell for supplying stable power to a load, a main circuit and a control circuit, an output detection voltage of the main circuit and a control circuit, and a reference output. An output error voltage amplifying circuit for comparing voltages and amplifying the difference voltage and supplying the amplified voltage to the main circuit / control circuit; and an input error for comparing an input detection current of the main circuit / control circuit with a corresponding reference input voltage. A power supply device comprising: a voltage amplification circuit; and a reference output voltage control circuit that changes the reference output voltage when an input current is larger than a set current value. 3. A power supply device connected to an output of a DC power generation device such as a fuel cell and supplying stable power to a load, comprising: a main circuit / control circuit; an output detection voltage and a reference output of the main circuit / control circuit. An output error voltage amplifier circuit for comparing voltages and amplifying the difference voltage to supply the amplified difference voltage to the main circuit / control circuit; and a first input error voltage for comparing an input detection voltage of the main circuit / control circuit with a reference input voltage An amplifier circuit, a second input error voltage amplifier circuit for comparing the input current of the main circuit and control circuit with a corresponding reference input voltage, and when the input voltage is lower than the set voltage value and when the input current is higher than the set current value. A power supply device comprising: a reference output voltage control circuit that changes the reference output voltage when any one or both of the cases is satisfied. 4. An output error voltage amplifier circuit comprising: an output voltage dividing resistor for detecting an output detection voltage; a reference output voltage source for generating a reference output voltage; and an output error voltage amplifier for differentially amplifying the two voltages. Claims 1 and 2
Or the power supply device according to 3. 5. An input error voltage amplifier circuit comprising: an input voltage dividing resistor for detecting an input detection voltage; a reference input voltage source for generating a reference input voltage; and an input error voltage amplifier for differentially amplifying these two voltages. 5. The method according to claim 1, wherein
The power supply as described. 6. A reference output voltage control circuit comprising a control voltage dividing resistor for changing a reference output voltage according to an output voltage of an input error voltage amplifier, and a clamp diode. , 3, 4 or 5. 7. An input error voltage amplifying circuit, comprising: an input current detection resistor for converting an input current into an input detection voltage for detection; a reference input voltage source for generating a reference input voltage; 5. The power supply device according to claim 2, further comprising an error voltage amplifier. 8. A first input error voltage amplifier circuit includes an input voltage dividing resistor for detecting an input detection voltage, a reference input voltage source for generating a reference input voltage, and an input error voltage for differentially amplifying these two voltages. The second input error voltage amplifying circuit includes an input current detection resistor that converts an input current into an input detection voltage and detects the input current, a reference input voltage source that generates a reference input voltage, And a reference output voltage control circuit, the reference output voltage control circuit comprising a control voltage component for changing a reference output voltage in accordance with each output voltage of the first and second input error voltage amplifier circuits. 5. The power supply device according to claim 3, comprising a piezoresistor and a clamp diode of each of the first and second input error voltage amplifiers. 9. The main circuit / control circuit is connected with an inverter for converting DC power into AC power immediately after a branch point between the connected load and an output voltage dividing resistor. The power supply device according to 1, 2, 3, 4, 5, 6, 7, or 8.