JP2000137530A - Parallel operation system for programed power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the current capacity of a programed power supply without changing a connection between the programed power supply to be a master power supply and a power supply terminal of a load. SOLUTION: In the parallel operation system for plural programed power supplies, the output sides of respective current/voltage conversion means 214A to 214C in plural programed power supplies 20A to 20C are connected in common through respective 3rd switch means 220A to 220C and the ON/OFF states of 1st to 3rd switch means are set up, so that the combination of programed power supplies to be driven in parallel can be optionally set up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a parallel operation system of a program power supply for supplying power to a load such as an IC.

[0002]

2. Description of the Related Art A conventional parallel operation system of a program power supply will be described with reference to FIG. FIG. 2 shows a state in which three program power supplies 20A, 20B, and 20C having the same configuration are connected to the load 30. In the figure, reference numeral 10 denotes a CP for outputting a set voltage value as a digital signal.
U, 200A, 200B, 200C are D / A converters, 2
02A, 202B, 202C, 204A, 204B, 2
04C, 212A, 212B, 212C, 216A, 2
16B, 216C and 218A, 218B, 218C
Are resistors, 206A, 206B, 206C, and 208
A, 208B and 208C are switches for turning on and off an analog signal, 210A, 210B and 210C are operational amplifiers, 214A, 214B and 214C are current detection circuits,
0A, 40B, 40C, 42A, 42B, 42C, 44
A, 44B, 44C are external output terminals, 46A, 46B,
46C is an external input terminal.

The output of the CPU 10 is supplied to each program power supply 20
A, 20B, 20C D / A converters 200A, 200
B, 200C. Here, the circuit configuration of the program power supply 20A will be described.
00A is connected to one end of a resistor 202A, and the other end of the resistor 202A is connected to a resistor 204A and a switch 2A.
06A is connected to one end. The other end of the resistor 204A is connected as a sense line to the power supply terminal VA of the load 30 via the external output terminal 40A.

On the other hand, the other end of the switch 206A is connected to one end of the switch 208A and the inverting input terminal of the operational amplifier 210A. The other end of the switch 208A is connected to one end of the resistor 216A and one end of the resistor 218A. The non-reverse input terminal of the operational amplifier 210A is grounded. The output of the operational amplifier 210A is a resistor 212A
The power supply terminal VA of the load 30 is connected as a force line via the external output terminal 42A.

[0005] Both ends of a resistor 212A are connected to the input side of a current detection circuit 214A, and the output end thereof is connected to a resistor 2A.
The other end of 16A is connected to an external output terminal 44A. From the output terminal of the current detection circuit 214A, the program power supply 20
As a result of detection of the output current of A, a voltage proportional to the output current is supplied to the program power supply 20 via the external output terminal 44A.
A is output as an external signal. Also, the resistor 218A
Is output to the outside as an input signal during parallel operation via the external input terminal 46A. Although the circuit configuration of the program power supply has been described focusing on the program power supply 20A so far, the same applies to the program power supplies 20B and 20C, and a duplicate description will be omitted.

However, since the program power supply 20B operates in parallel with the program power supply 20A, the external output terminal 40B as a sense line is not connected to any part, and the external output terminal 42B as a force line is connected to the program power supply 20A. In addition, it is connected to the power supply terminal VA of the load 30. An external output terminal 40C as a sense line of the program power supply 20C and an external output terminal 42C as a force line thereof are connected to a power supply terminal VB of the load 30. The external output terminal 44A and the external input terminals 46B and 46C are connected to each other.

[0007] Next, the program power supply 20A,
The operation of the parallel operation of 20B and 20C will be described. Each of the program power supplies 20A, 20B, 20 has two types of operation modes, that is, independent operation and parallel operation. The islanding operation will be described focusing on the program power supply 20A.
At the time of the single operation, the switch 206A is turned on and the switch 206A is turned on.
08A turns off. From the CPU 10, the program power supply 2
The digital signal of the voltage value set for 0A is D /
When input to the A / A converter 200A, the D / A converter 200
A converts it to an analog signal and outputs it.

Here, when the switch 206A is turned on and the external output terminals 40A and 42A are connected to the power supply terminal VA of the load 30, the output of the D / A converter 200A becomes
The output is input from the resistor 202A to the operational amplifier 210A, and the output of the operational amplifier 210A reaches the power supply terminal VA of the load via the resistor 212A and the external output terminal 42A. The power supply terminal VA connects the external output terminal 40A and the resistor 204A. The system that returns to the input side of the operational amplifier 210A via the inverter constitutes a closed loop using the operational amplifier 210A as an inverting amplifier.

Therefore, an inverted voltage of the output of the D / A converter 200A is output to the power supply terminal VA,
The CPU 10 inputs a digital signal obtained by inverting the set voltage value to the D / A converter 200A,
A set voltage can be applied to the power supply terminal VA of the load. In FIG. 2, the program power supply 20C is connected to the power supply terminal VB of the load 30, but the CPU 10 outputs a digital signal having a set value different from that of the program power supply 20A to the D.
/ A converter 200C, the power supply terminal V
A power supply voltage different from the power supply voltage supplied to the power supply terminal VA can be applied to B.

A power supply current flowing from the output terminal of the operational amplifier 210A to the power supply terminal VA of the load 30 through the resistor 212A is supplied to the resistor 212A by the current detection circuit 214.
, And is output to the external output terminal 44A and one end of the resistor 216A as a voltage value proportional to the output current value of the operational amplifier 210A. Next, the parallel operation will be described focusing on the program power supply 20B. During the parallel operation, the switch 206B turns off and the switch 208B turns on. As a result, the signal is input from the external input terminal 46B to the operational amplifier 210B via the resistor 218B, passes through the resistor 212B from the output terminal of the operational amplifier 210B, and passes from the output terminal of the current detection circuit 214B via the resistor 216B. A system returning to the input side of 210B is formed, forming a closed loop using the operational amplifier 210B as an inverting amplifier.

That is, the voltage value obtained by inverting the polarity of the voltage supplied from the external input terminal 46B is applied to the current detection circuit 214B.
The closed loop operates so that the output becomes. In FIG. 2, the external output terminal 44A, which is the output of the current detection circuit 214A of the program power supply 20A, is connected to the external input terminal 46B of the program power supply 20B and the external input terminal 46C of the program power supply 20C. The program power supply 20B is connected to the program power supply 2B.
It operates with the voltage value proportional to the output current of 0 A as the set value.

In other words, the program power supply 20B
The closed loop operates so as to have the same output current as the program power supply 20A. Here, since the external output terminal 42B of the program power supply 20B is connected to the power supply terminal VA of the load 30 similarly to the program power supply 20A, the program power supplies 20A and 20B are connected to the voltage value set in the D / A converter 200A. Is output to the power supply terminal VA of the load 30, and the load 3
The power supply current required by the power supply terminal VA of 0 is divided into two and balanced.

In FIG. 2, only the program power supply 20B operates in parallel with the program power supply 20A, and the program power supply 20C operates independently so as to supply the power supply voltage to the power supply terminal VB of the load 30. The number of program power supplies operated in parallel to 20 A is not limited to one, and any number of program power supplies can be connected. Assuming that the number of program power supplies parallel to the program power supply 20A is n, the output current of each program power supply is 1 / (n +) of the current value required by the power supply terminal VA of the load 30.
1). As described above, in the parallel operation of the program power supplies, when a current that cannot be supplied by one program power supply is required, the output current can be supplemented by operating the other program power supplies in parallel.

[0014]

In the conventional parallel operation system of a program power supply, a CPU as a power supply voltage setting means is used.
A program power supply (hereinafter referred to as a parent power supply) for supplying a set voltage to a load via a D / A converter, and a voltage corresponding to an output current detection value of the parent power supply are supplied to the load from the program power supply. Any number of program power supplies (hereinafter referred to as child power supplies) that output the same current as the parent power supply as the set voltage are connected by wiring, and the parent power supply that allows the child power supplies to operate in parallel is fixedly determined. When increasing the current supplied to the power supply terminal of the load connected to the parent power supply, change the program power supply to another parent power supply connected to the child power supply and capable of parallel operation. It was necessary to change the connection with the terminal.

The present invention has been made in view of such circumstances, and can increase the current capability of a program power supply without changing the connection between a program power supply serving as a parent power supply and a power supply terminal of a load. It is an object to provide a parallel operation system of a program power supply.

[0016]

According to a first aspect of the present invention, there is provided a power supply voltage setting means for outputting data indicating a voltage value to be output, and a power supply voltage setting means for setting the power supply voltage setting means. Amplifying means for supplying a power supply voltage having a given voltage value to a load, current / voltage converting means for detecting an output current of the amplifying means and outputting a voltage proportional to the output current,
First switching means provided between the output side of the power supply voltage setting means and the input side of the amplifying means; and first switching means provided between the output side of the current / voltage converting means and the input side of the amplifying means. A parallel operation system of a plurality of program power supplies, the output side of each current / voltage conversion means of each of the plurality of program power supplies being commonly connected via a third switch means, The combination of the program power supplies operating in parallel can be arbitrarily set by setting the ON / OFF state of the first, second and third switch means.

According to the first aspect of the present invention, the third switch means is newly provided on the output side of the current / voltage conversion means for detecting the output current for each of the plurality of program power supplies and converting it into a voltage. The other end of the third switch means and the terminal for inputting the voltage value of the measured current of the main power supply in parallel connection are connected for all the program power supplies, and the first, second and third switch means are connected. By setting the on / off state, the program power supply as the parent power supply and the program power supply as the child power supply connected in parallel to it can be set arbitrarily. The current capability of the program power supply can be increased without changing the connection.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A parallel operation system of a program power supply according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a parallel operation system of a program power supply according to an embodiment of the present invention. In the figure, the parallel operation system of the program power supply according to the embodiment of the present invention is different from the conventional system shown in FIG. 2 in the circuit configuration in that the switches 220A, 220B and 220C are different.
Is newly added, and the connection on the output side of the current detection circuit for detecting the output current of the program power supply is partially changed. Since other configurations are the same, duplicate description will be omitted. The modified circuit configuration will be described focusing on the program power supply 20A. The output terminal of the current detection circuit 214A is connected to the resistor 216A and one end of the switch 220A. The other end of the switch 220A is connected to the external output terminal 44A. Program power supply 20B, 20
The same applies to C.

The external output terminals 44A, 44B, 44
C and the external input terminals 46A, 46B, 46C are commonly connected. As for the program power supply 20A, the CPU 10 is used as the power supply voltage setting means of the present invention, the operational amplifier 210A is used as the amplifying means of the present invention, and the current detecting circuit 21 is used.
4A and the resistors 212A and 216A are the current / voltage conversion means of the present invention, the switch 206A is the first switch means of the present invention, the switch 208A is the second switch means of the present invention, and 220A is the second switch means of the present invention. In the switch means of 3,
Each corresponds. Other program power supplies 20B, 20
C is the same as the component of the program power supply 20A.

Here, the operations during the single operation and the parallel operation will be described by focusing on the program power supply 20A. During the single operation, the switch 220A is turned off. After that, as in the prior art shown in FIG. 2, the switch 206A is turned on, the switch 208A is turned off, and the operational amplifier 210 functions as an inverting amplifier that uses the output of the D / A converter 200A as a set value. A set voltage is applied to the power supply terminal VA.

In parallel operation, the program power source 2
If 0A operates as the main power supply, switch 220A
Turn on. After that, it operates in the same manner as in the single operation. Next, the case where the program power supply 20B operates as a slave power supply during the parallel operation will be described focusing on the program power supply 20B. In this case, the switch 220B is turned off, and the rest is performed in the same manner as in the prior art shown in FIG. , Switch 206
B is turned off, the switch 208B is turned on, and an operation is performed so as to output the same current as the output current of the parent power supply, using the current measurement value of the parent power supply provided from the external input terminal 46B as a set value.

In FIG. 1, the program power supply 20A is connected to the power supply terminal VA of the load 30 so as to function as a parent power supply during parallel operation, and the program power supply 20B functions as a child power supply to the program power supply 20A during parallel operation. Connected. The program power supply 20C is connected to the power supply terminal VB so as to operate independently. Here, the switch setting of each program power supply is such that the program power supply 20A is such that the switch 206A is on, the switch 208A is off, and the switch 220A is on. The switch 220B is off, and the program power supply 20C
6C is on, switch 208C is off, switch 220
C is off.

By setting this switch, the external output terminal 4
4A, the voltage value proportional to the output current of the program power supply 20A is supplied to only the program power supply 20B from the external input terminal 46B, and the two program power supplies 20A and 20B operate in parallel, and the program power supplies 20A, 20B
0B divides the power supply current required by the power supply terminal VA of the load 30 into two and outputs the current.

Here, when the conditions on the load 30 side change and it is desired to increase the power supply current not on the power supply terminal VA but on the power supply terminal VB side, the current capability of the program power supply is increased by parallel operation. That is, the setting of each switch is changed so that the program power supply 20B that has been operating using the program power supply 20A as the parent power supply operates using the program power supply 20C as the parent power supply.

At this time, each program power supply 20A, 20
The switch settings of B and 20C are as follows: the program power supply 20A that has been operated alone has the switch 206A turned on, the switch 208A turned off, the switch 220A turned off, and the program power supply 20B that has become a child power supply to the program power supply 20C has the switch 206B Is off, switch 208B
Is on, the switch 220B is off, and the program power supply 20C, which is the parent power supply in the parallel operation,
6C is on, switch 208C is off, switch 220
C is turned on.

With this switch setting, the voltage value proportional to the output current value of the program power supply 20C is applied to the external output terminal 4
4C and the program power supply 20 via the external input terminal 46B.
B, only the program power supplies 20C and 20B
The units operate in parallel, and divide the power supply current required by the power supply voltage VB of the load 30 into two and output. At this time, the connection from the external output terminal 42B to the load 30 is changed from the power supply terminal VA to the power supply terminal VB.

In FIG. 1, only the program power supply 20B operates in parallel with the program power supply 20A and the program power supply 20C operates independently with respect to the power supply terminal VB of the load 30, but the program power supply 20A or the program power supply 20C The number of parallel program power supplies is not limited to one, and arbitrary plural power supplies can be connected.

As described above, according to the embodiment of the present invention, the D / A is controlled by the CPU functioning as the power supply voltage setting means.
Two switches (206, 208) provided on the input side of an operational amplifier as amplifying means for outputting a power supply voltage of a voltage value set via a converter, and two switches (206, 208) provided on the output side of a current detection circuit of each program power supply. Switch provided (220)
By connecting the program power supply functioning as a child power supply in parallel operation to the load by simply changing the connection from the program power supply functioning as a child power supply to the load in parallel operation. Thus, the output current can be increased.

[0029]

According to the first aspect of the present invention, the third switch means is newly provided on the output side of the current / voltage conversion means for detecting the output current for each of the plurality of program power supplies and converting it into a voltage. , The other end of the third switch means and the terminal for inputting the voltage value of the measured current of the main power supply in parallel connection are connected for all the program power supplies.
First switch means provided between the output side of the voltage setting means and the input side of the amplification means, and second switch provided between the output side of the current / voltage conversion means and the input side of the amplification means. By setting the ON and OFF states of the means and the third switch means, it is possible to arbitrarily set a program power supply as a main power supply and a program power supply as a child power supply connected in parallel to the main power supply. The current capability of the program power supply can be increased without changing the connection between the main power supply and the power supply terminal of the load.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a parallel operation system of a program power supply according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional parallel operation system of a program power supply.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 CPU 20A-20C Program power supply 30 Load 206A-206C Switch (switch means) 208A-208C Switch (switch means) 220A-220C Switch (switch means) 210A-210C Operational amplifier 214A-214C Current detection circuit (current / voltage conversion means) )

Claims (1)

[Claims] 1. A power supply voltage setting means for outputting data indicating a voltage value to be output, an amplification means for supplying a power supply voltage having a voltage value set by the power supply voltage setting means to a load, and an output of the amplification means Current / voltage conversion means for detecting a current and outputting a voltage proportional to the output current; first switch means provided between an output side of the power supply voltage setting means and an input side of the amplification means; In a parallel operation system of a plurality of program power supplies having a second switch means provided between an output side of the current / voltage conversion means and an input side of the amplification means, the current of each of the plurality of program power supplies / The output sides of the voltage conversion means are connected in common via third switch means, and the first, second, and third switch means are turned on and off to set a parallel operation program. Parallel operation system program source, characterized in that the arbitrarily set power combinations.