JPH063446Y2 - Parallel operation device with multiple power supplies - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a parallel operating system of a plurality of power sources for parallel operation by connecting a plurality of power source devices that generate stabilized output to a load in parallel.

(Prior Art) Conventionally, as a method of simply increasing the power supply capacity of a power supply device such as a switching regulator that supplies a stabilized output voltage, a so-called parallel operation device in which a plurality of small-capacity power supply devices are connected in parallel to a load It has been known.

(Problems to be Solved by the Invention) However, in such a conventional parallel operation apparatus of a plurality of power supplies, each power supply device is individually provided with a volume capable of adjusting the stabilized output voltage. When connecting in parallel to the load, it is necessary to adjust the volume so that the stabilized output voltage of each power supply unit becomes equal, and if you try to change the set value of the output voltage during operation, There is a problem that the volume of all the power supply devices must be adjusted, and the work of adjusting the output voltage becomes complicated.

(Means for Solving Problems) The present invention has been made in view of such conventional problems. Even if a plurality of power supply devices are connected in parallel to a load, any one power supply device is connected. It is an object of the present invention to provide a parallel operation device of a plurality of power sources, in which the output voltage of all power supply devices can be commonly set and changed only by adjusting the output voltage setting volume provided in the above.

In order to achieve this object, in the present invention, a plurality of power supplies in parallel operation are connected in parallel with each output of a plurality of power supplies that generate a stabilized output voltage in parallel, Each of the power supply devices is provided with a parallel control type or series control type reference voltage control circuit having a reference voltage adjusting means as a reference voltage generation circuit for generating a reference voltage for determining a stabilized output voltage. The voltage output terminals are interconnected.

(Operation) In the parallel operation device of the present invention having such a configuration, in the case where, for example, a plurality of power supply devices are each provided with a parallel control type reference voltage generation circuit and are interconnected, Even if the voltages are different from each other, the lowest reference voltage among the plurality of reference voltages is effective for all the power supply devices. For this reason, one power supply unit is used for voltage adjustment, and the reference voltage of all other power supply units is set to the maximum value, so that the reference voltage adjustment volume of the power supply unit for adjustment can be changed. The setting of the stabilized output voltage of all power supply devices can be changed in common.

Further, when the serial control type reference voltage generating circuits are provided and interconnected, the highest reference voltage of the plurality of reference voltages is effective for all power supply devices when the reference voltages are different from each other. . Therefore, by setting one power supply unit for voltage adjustment and setting all other power supply unit reference voltages to the minimum value, it is possible to adjust the reference voltage adjustment volume of the power supply unit for adjustment. The stabilized output voltage of the power supply device can be changed in common.

(Embodiment) FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, 1A, 1B, and 1C are power supply devices that generate a stabilized output voltage, and in this embodiment,
3 shows three power supplies.

The power supply devices 1A to 1C will be described on behalf of 1A.
Is an output control circuit, 3 is a comparison circuit, and 4 is a reference voltage generation circuit. The reference voltage Vr ₁ generated by the reference voltage generation circuit 4 is input to the comparison circuit 3, and the output voltage of the output control circuit 2 in the comparison circuit 3 is input. Then, based on the output of the comparison circuit 3, the output control circuit 2 controls so that the output voltage is maintained at a constant output voltage determined by the reference voltage Vr ₁ . The configuration of such a power supply device is the same for the other power supply devices 1B and 1C.

As the reference voltage generation circuit 4 provided in each of the power supply devices 1A to 1C, a parallel control type or a series control type reference voltage generation circuit is used, as will be described later.

Reference numeral 5 denotes a load, which receives the output terminals 6a, 6b, 6c of the power supply devices 1A, 1B, 1C connected in parallel, and has three times the power capacity of each power supply device due to the parallel connection of the three power supply devices 1A to 1C. Can receive power supply.

Further, in the present invention, the reference voltage output terminals 7a, 7b and 7c of the reference voltage generating circuit 4 provided in each of the power supply devices 1A, 1B and 1C are connected to each other, and the reference voltages 7a to 7c are connected. By interconnecting the above, it is possible to commonly change the setting of the stabilized output voltage of all the power supply devices only by changing the reference voltage adjusting volume provided in the reference voltage generating circuit 4 of any one of the power supply devices. .

FIG. 2 is a circuit block diagram showing a specific embodiment in which a parallel control type reference voltage generating circuit is used as the reference voltage generating circuit 4 by taking as an example a parallel operating device having two power supply devices.

In FIG. 2, two power supply devices 1A are provided for the load 5.
And a pair of output terminals 6a and 6b of 1B are connected in parallel, and the power supply devices 1A and 1B have a comparison circuit 3 for comparing the reference voltage with the output voltage, and a constant voltage determined by the reference voltage based on the comparison output of the comparison circuit 3. An output control circuit 2 is provided to control the output voltage so that

Next, the reference voltage generating circuit 4 has, for example, on the power supply device 1A side, an operational amplifier 8, and a Zener diode 9 for setting a fixed reference voltage Vr ₀ is connected to the non-inverting input terminal of the operational amplifier 8. Then, the voltage VR for adjusting the reference voltage and the divided voltage of the fixed resistor R are inputted to the inverting input terminal, and further, one end of the volume VR and the cathode side of the diode 10 provided at the output of the operational amplifier 8 are connected via the resistor R2. Power supply voltage + Vc is applied.

The circuit configuration of such a reference voltage generation circuit 4 is the power supply device 1.
B is the same. Then, the pair of reference voltage output terminals 7a, 7 of the reference voltage generating circuit 4 in the power supply devices 1A, 1B.
b are connected to each other.

Next, the operation of the embodiment shown in FIG. 2 will be described.

First, prior to the description of the operation, the input voltage of the inverting input terminal of the operational amplifier 8 in the reference voltage generation circuit 4 of the power supply device 1A,
That is, the divided voltage of the volume VR and the resistor R1 is Vx ₁ , the fixed reference voltage by the Zener diode 9 is Vr ₀ , the reference voltage output to the comparison circuit 3 is Vr ₁ , and the power supply device 1B is used.
Vx ₂ divided voltage of the volume VR and the resistor R1 for the inverting input of the operational amplifier 8 in the reference voltage generating circuit 4,
The fixed reference voltage by the Zener diode 9 is Vr ₀ , and the reference voltage output to the comparison circuit 3 is Vr ₂ .

First, taking the reference voltage generation circuit 4 of the power supply device 1A as an example,
A single operation in which the reference voltage output terminals 7a and 7b are not interconnected will be described. In the reference voltage generation circuit 4, the operational amplifier 8 operates so as to make the input voltage Vx ₁ to the inverting input terminal equal to the fixed reference voltage Vr ₀ set by the Zener diode 9 of the non-inverting input terminal.

By such an operation of Vr ₀ = Vx ₁ of the operational amplifier 8, for example, assuming that there is a one-to-one resistance ratio in which the resistance values of the volume VR and the resistance R1 are equal, the voltage Vx ₁ generated across the resistance R1 is Since the operational amplifier 8 operates so as to be equal to the fixed reference voltage Vr ₀ , the same voltage Vx ₁ is generated across the volume VR having the same resistance value, and as a result, the reference voltage Vr ₁ for the comparison circuit is Vr ₁ = 2 · V
x ₁

More specifically, for example, assuming that the fixed reference voltage Vr ₀ = 5V, the operational amplifier 8 operates so that Vx ₁ = 5V, and if the volume VR and the resistance R1 have the same one-to-one relationship, since produce 5V to both ends of the VR, the reference voltage Vr ₁ = 10V for comparing circuit 3.

Therefore, the reference voltage Vr ₁ can be varied in proportion to the value of the volume VR within a range not exceeding the power supply voltage + Vc.

Next, the operation when the reference voltage output terminals 7a and 7b are interconnected as shown in the figure will be described.

Now, the volume VR and the resistance R1 in the reference voltage generation circuit 4 of the power supply device 1A are adjusted to a resistance ratio of 1: 1, while the resistance of the volume VR and the resistance R1 in the reference voltage generation circuit 4 of the power supply device 1B is adjusted. It is assumed that the ratio is adjusted to have a resistance value relationship of 2: 1.

At this time, if the fixed reference voltage Vr ₀ = 5V, for example, the power supply device 1A having a resistance ratio of VR to R1 of 1: 1.
As described above, the reference voltage Vr ₁ on the side becomes Vr ₁ = 10V, and this reference voltage Vr ₁ = 10V is applied to the reference voltage generation circuit 4 on the power supply device 1B side by interconnection. Power supply 1B
Since the resistance ratio of VR and R1 in the reference voltage generation circuit of 2 is set to 2: 1, the input voltage Vx _{2 with} respect to the inverting input of the operational amplifier 8 is Vx ₂ ≈3.3V. Therefore, the operational amplifier 8 outputs the input voltage Vx ₂ to the zener diode 9
The output current is to be sent in order to increase the fixed reference voltage Vr = 5V determined by However, since the diode 10 is connected to the output of the operational amplifier 8 in the opposite direction to prevent the output current from flowing out, the output current of the operational amplifier 8 attempting to increase the input voltage Vx ₂ cannot flow out. As a result, the operational amplifier 8 inputs voltage V
The function of making x ₂ equal to the fixed reference voltage Vr ₀ is lost, and the operational amplifier 8 itself does not exist equivalently. Therefore, the reference voltage Vr ₁ generated by the reference voltage generation circuit 4 of the interconnected power supply device 1A is directly supplied to the comparison circuit 3 of the power supply device 1B, and the power supply devices 1A and 1B are based on the reference voltage Vr ₁ . The output control circuit 2 is controlled by the output of the comparison circuit 3, and since the reference voltage Vr ₁ is the same, the output voltage to the load 5 is commonly controlled to be the same voltage.

In other words, the setting state of the reference voltage Vr ₂ by the volume VR, which can be regarded as the absence of the operational amplifier 8 provided in the reference voltage generation circuit 4 of the power supply device 1B, is set between the resistor VR and the volume VR of the power supply device 1A. And the resistance ratio is 1
By setting Vr ₁ = 10V, for example, Vr ₁ = 10V is set. On the other hand, the volume VR of the power supply device 1B is adjusted to Vr ₂ = 15V by setting the resistance ratio with the resistor R1 to 2: 1. In such a case, the lower reference voltage is valid, and the lower reference voltage is set in all the power supply devices.

This is also the case when not only two power supply devices but also three or four power supply devices are connected, and the lowest reference voltage is valid among the plurality of power supply devices, and based on this lowest reference voltage. The regulated output voltage of all the power supplies is controlled.

Therefore, as shown in FIG. 1, for example, when three power supply devices 1A to 1C are interconnected, when the power supply device 1A is used for adjustment, the reference voltage generating circuit 4 of the other power supply devices 1B and 1C is used. By adjusting the provided volume to the setting state of the maximum reference voltage, only the volume provided in the reference voltage generation circuit 4 of the power supply device 1A decided for adjustment is adjusted to stabilize the output of all the power supply devices. The voltage can be commonly set and changed.

FIG. 3 is a circuit block diagram showing another embodiment of the present invention in which a serial control type reference voltage generating circuit is used as the reference voltage generating circuit.

3 is different from the parallel control type reference voltage generating circuit of FIG. 2 in that the diode 10a connected to the output of the operational amplifier 8 is switched in the opposite direction, and the volume VR and the anode side of the diode 10 are connected. Power supply voltage + Vc
2 is the same as that of the parallel control type shown in FIG. 2 except that the resistor R2 is not provided in the circuit for applying the voltage.

When the series control type reference voltage generating circuits of FIG. 3 are interconnected, the higher reference voltage of the reference voltages Vr ₁ and Vr ₂ determined by the adjustment of the volume VR becomes effective and the lower reference voltage becomes effective. It can be considered that the operational amplifier 8 that adjusts the voltage does not exist, whereby the higher reference voltage can be commonly set as the reference voltage for both comparison circuits 3. Therefore, when the series control type reference voltage generating circuit is used, for example, in the three power supply devices 1A to 1C shown in FIG. 1, when the power supply device 1A is used for adjustment, another power supply device is used. 1B, in that it sets the reference voltage to a minimum value by adjusting the volume for 1C, the reference voltage Vr ₁ of the reference voltage generating circuit 4 of the power supply apparatus 1A and supplied for adjustment to all the power supply 1A~1C Then, the common setting change of the output voltage based on only the reference voltage Vr ₁ can be performed.

(Effects of the Invention) As described above, according to the present invention, in a parallel operation device with a plurality of power supplies that operate in parallel by connecting each output of a plurality of power supplies that generate a stabilized output voltage to a load in parallel, As a reference voltage generation circuit provided in each power supply device, a parallel control type or a serial control type reference voltage generation circuit is provided, and the reference voltage output terminals are interconnected to adjust the reference voltage provided in any one power supply device. By adjusting the means, it is possible to change the setting of the stabilized output voltage of all power supply devices in common, and to adjust the output voltage in a parallel operation device that increases the power supply capacity by connecting a small-capacity power supply device in parallel to the load. The adjustment work is extremely simple because it only needs to be performed for one power supply device, and the output voltage of all power supply devices is commonly controlled to the same reference voltage. The current balance can be kept stable.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic embodiment of the present invention,
FIG. 2 is a circuit block diagram showing an embodiment using a parallel control type reference voltage generating circuit, and FIG. 3 is a circuit block diagram showing another embodiment using a serial control type reference voltage generating circuit. 1A, 1B, 1C: Power supply device 2: Output voltage control circuit 3: Comparison circuit 4: Reference voltage generation circuit 5: Loads 6a, 6b, 6c: Output terminals 7a, 7b, 7c: Reference voltage output terminal 8: Operational amplifier 9: Zener diode 10: Diode VR: Volume R1, R2: Resistor

Claims (1)

[Scope of utility model registration request] 1. A parallel operation system using a plurality of power supplies for parallel operation by connecting outputs of a plurality of power supplies that generate a stabilized output voltage in parallel to a load, wherein each of the power supplies has a stabilized output. A parallel control type or series control type reference voltage generating circuit having a reference voltage adjusting means is provided as a reference voltage generating circuit for generating a reference voltage for determining a voltage, and the reference voltage output terminals of the reference voltage generating circuit are interconnected. A parallel operating system with multiple power supplies.