JPS60134921A - Output voltage varying system - Google Patents

Abstract

PURPOSE:To set easily respective reference voltages of plural power supply units simultaneously and continuously by transmitting a digital signal, which can be varied continuously, to a reference voltage setting circuit and varying respective reference voltages continuously with this signal. CONSTITUTION:A constant voltage source 24 of a digital signal generating circuit 23 in a power supply controller 21 is varied by a variable resistor 25 to take out a voltage, and the taken-out voltage is converted to the digital signal by a digital signal converting circuit 26. When the output voltage of a power supply unit PSU1 is adjusted, the digital signal converted by the circuit 26 is transmitted to a reference voltage setting circuit which generates a reference voltage while converting bit signals from digital signals to analog signals through a signal transmitting circuit 17 successively, and the reference voltage from the circuit 15 is varied to adjust the output voltage so that it is a prescribed voltage. Consequently, the voltage value taken out by varying the variable resistor 25 can be varied continuously in proportion to the reference voltage of the circuit 15, and reference voltages of plural power supply units PSU1- PSUn are varied simultaneously and continuously by one volume 25, and thus, adjustment is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a variable output voltage system for a power supply control device that operates a plurality of power supply units in parallel to supply power to a load of an electronic device.

(bl Background of the Technology) Conventionally, power consumption for power supplies to electronic devices has increased as the functions of electronic devices have increased, and a power supply device has been required to supply power to the input power. High-frequency switching power supply circuits have been widely put into practical use, as devices and other peripheral electronic components have become smaller, and it is easier to control the rise and fall of the power supply voltage.This high-frequency switching power supply circuit system converts commercial power into a power rectifier and smoothing circuit. The DC power source is used as a DC power source, and the control circuit turns the gate of the switching element on and off using this DC power source.

It includes a switching circuit that intermittently converts a DC power source into a high-frequency rectangular wave voltage, and a transformer transforms the high-frequency rectangular wave voltage from the switching circuit, and converts it into DC using a rectifier and smoothing circuit to obtain a DC output. One system 6 of such a high frequency switching type power supply circuit is converted into one power supply unit 1, multiple power supply units are operated in parallel, and large power is supplied to the load of electronic equipment through centralized control of the power supply control device. be.

Generally speaking, electronic equipment uses semiconductor integrated circuits, large-scale semiconductor integrated circuits, etc., so the power supply voltage of the power supply device that supplies large power is a low voltage power supply of about 5 volts, and the power supply voltage is several hundred to several thousand amperes. It supplies an incoming current of . Therefore, a power supply unit with a power capacity of several hundred amperes per unit is required.
? Several M units are operated in parallel to serve as a power supply source for electronic equipment.

(C1 Prior Art and Problems This type of conventional power supply device will be explained below.
The figure shows a wiring diagram of a power supply device that supplies power to a load from a plurality of power supply unit groups operated in parallel. 1 is a power supply unit group, and power supply unit 1 is composed of n power supply units PSUI--P S U n operating in parallel, and each power supply unit 71-PSLII-PS[ 1
n units individually receive AC power from the input power source 2, convert the AC power into DC power, and collectively supply the output DC power to the load side 3. Power control of the power supply unit groups PSUt-PSUn that perform parallel operation is centrally controlled by the power supply control device 4, and power on/off, etc. are controlled by on/off control signals of the power supply control device 4.

FIG. 2 shows a block diagram of a control system configuration between a plurality of power supply unit groups and a power supply control device, and illustrates the overall structure of the control system.

Identical objects are indicated by the same symbols. Since the individual power supply units of the power supply unit group PSUI--PSUn that operate in parallel have the same circuit configuration, the control system of one of them, the power supply unit PSUI, and the power supply control device 4 will be described as a representative. Reference numeral 5 indicates a pulse width control circuit, and the pulse width control circuit 5 is powered on by a power supply signal from the power supply control section 6 of the power supply control device 4, and drives the drive circuit 7 to switch the switching element 8a.

Controls the on/off switching pulse width of 8b.

To supply DC power to the load side, the AC power from the input power supply 2 is received by the PsUI, and the DC that has been rectified through the rectifier circuit 9 is turned on and off by switching elements 8a and 8b to intermittent the DC. Get waves. Next, the DC intermittent wave is transmitted to the secondary side through the transformer 10, and the rectifying and smoothing circuit 1
1, and outputs DC power from output terminals a and b.

This power supply Unisol l-11S old is provided with a constant voltage control circuit for the output voltage of the power supply unit. On the output circuit side, in order to detect the output voltage between output terminals a and b, an error detection resistor 12 and an error detection resistor 13 are connected in series, and one end of the error detection resistor 12 is connected to + on the output terminal a side. On the side, one end of the error detection resistor 13 is connected to one side of the output terminal side,
From the connection point between the error detection resistor 12 and the error detection resistor 13, the detected voltage of the output voltage between the output terminals a and b is input to one input terminal of the error detector 14, and the other input terminal of the error detector 14 is input to the input terminal of the error detector 14. An accurate reference voltage obtained by finely adjusting the reference voltage from the two reference voltage setting circuit 15 using the output voltage variable resistor 16 is input to the terminal. The error detector 14 compares the error between the detected output voltage between the output terminals a and b and an accurate reference voltage finely adjusted by the output voltage variable resistor 16.

An error voltage signal is sent from the error detector 14 to the pulse width control circuit 5, and the drive circuit 7 is controlled by the pulse width control circuit 5.
The output voltage is stabilized at a constant voltage by controlling the on/off pulse width of the switching elements 8a and 8b. The reference voltage value generated from the reference voltage setting circuit 15 is controlled by the power supply control section 6 by sending out a fixed number of bit signals from the signal sending circuit 17, and is varied in several stages by the bit signals. This reference voltage is set to an accurate reference voltage by fine adjustment of the output voltage variable resistor 16.

However, in this conventional constant voltage control method using multiple power supply units operated in parallel, the reference voltage value of each error detector is set in advance (multiple power supply units).
PSUI---It is necessary to finely adjust the output voltage variable resistor for each PS[In to set the reference voltage, and the more power supply units are operated in parallel, the more the output voltage variable resistor This method has the disadvantage of requiring a large amount of man-hours for fine adjustment.

cd) 8 Purpose of the Invention The present invention aims to solve the drawback that the conventional fine adjustment requires a large amount of adjustment man-hours.

(el) Structure of the Invention The above object is to operate a plurality of power supply units in parallel, each having a voltage comparison circuit that controls the output voltage to be constant by comparing the detected output voltage and the reference voltage from the reference voltage setting circuit. In a power supply control device, the power supply control device includes a signal sending circuit that supplies power to a load of an electronic device and sends a digital signal to each of the reference voltage setting circuits to set a reference voltage.

The power supply control device is provided with a digital signal generation circuit that generates a continuously variable digital signal.

The present invention is configured to send a digital signal from the digital signal generating circuit to each of the base voltage generating circuits via the signal sending circuit to set a reference voltage, and the power supply control having the above structure. A memory circuit for temporarily storing digital signals is added to the device, and the digital signal generated by the digital signal generation circuit is stored in the memory circuit, and the digital signal stored in the memory circuit is used to generate the signal output circuit. This can also be achieved by the present invention, which is configured to send the reference voltage to each of the reference voltage setting circuits to set the reference voltage.

Immediately, in a power supply control device that operates multiple power supply units in parallel to supply power to the loads of electronic equipment, each voltage comparison circuit compares the detected output voltage with the reference voltage and controls the output voltage to a constant level. A digital signal generated by a continuously variable digital signal generation circuit is sent to the reference voltage setting circuit that sets the reference voltage via the signal sending circuit.

By configuring each reference voltage to be continuously varied by the input digital signal, the reference voltage for each of multiple power supply units can be easily set simultaneously and continuously. The present invention provides an output voltage variable method in which a reference voltage can be set after M-products of digital signals from a memory circuit are provided.

('') Embodiment of the Invention An embodiment of the present invention will be described below. Fig. 3 shows a block diagram of the control system configuration between a group of power supplies 1 and a power supply control device according to the present invention. control device, 2
2 is a power supply control section, 23 is a digital signal generation circuit, 24
is a constant voltage source, and 25 is a volume.

26 indicates a digital signal conversion circuit. Power control device 2
] controls the power supply units PSUl-PSLln, and has a power supply control section 22, a digital signal generation circuit 23, and a signal transmission circuit 17. The power supply control unit 22 is a power supply unit 1-P.
A power supply signal is sent to SUI--PSUn to control the digital signal generation circuit 23 and signal transmission circuit 17. The digital signal generation circuit 23 is constituted by a digital signal conversion circuit 26 which extracts an arbitrary voltage by varying the power from the constant voltage source 24 with a volume 25 and converts the extracted voltage value into a digital signal.

In FIG. 3, the power supply control device 21
A function to control the output voltage of PSIJt-PSlJn.

The function of generating a DC power supply from the power supply unit PSUt-PsUn to supply the output voltage to the load side is the same as described above, so it is omitted here. This will be explained below. Other power supply units t-PSIJ2'-PSUn are also set using the same method. The constant voltage source 24 of the digital signal generation circuit 23 of the power supply control device 2 is varied with the volume 25 to extract the voltage, and the extracted voltage value is converted into a digital signal by the digital signal conversion circuit 26. When adjusting the output voltage of the power supply unit psui.

The digital signal converted by the digital signal conversion circuit 26 is sequentially sent via the signal sending circuit 17 to the reference voltage setting circuit 15 which converts the bit signal from a digital signal to an analog signal to create a reference voltage.

The reference voltage from the reference voltage setting circuit 15 is varied to adjust the output voltage to a specified voltage. Therefore.

The voltage value taken out by varying the volume 25 is proportional to the reference voltage of the reference voltage setting circuit 15, and can be varied continuously, and this single volume 25 can be used to control each of the multiple power supplies (PStll--PSLln). Since the reference voltage can be varied simultaneously and continuously,
It becomes easier to organize.

FIG. 4 is a block diagram showing another embodiment of the present invention, in which a memory circuit for multiplying m digital signals is added to the power supply control device 21 of FIG. 3. Reference numeral 27 indicates a test switch, and reference numeral 28 indicates a memory circuit. The test switch 27 is a switch that switches between controlling the power supply unit PSU and -1'sun during voltage adjustment and operation, and the memory circuit 28 is a memory that stores digital signals generated by the digital signal ordering circuit 23. be. When adjusting the reference voltage, turn on the test switch 27, set the reference voltage for each of the multiple power supplies, PSUI-PSUn in the same manner as described above, and turn off the test switch 27 during operation. When the power is turned on, the digital signal values of the digital signal conversion circuit 26 are read and written into the memory circuit 28.

Thereafter, the power supply 11 control unit 22 controls the power supply unit (PSIJ) according to the digital signal value written in the memory circuit 28.
The reference voltage of t-PSUn is set to control the output voltage.

By storing the adjusted digital signal value in the memory circuit 28, there is an advantage that it is not affected even if the constant voltage source 24 fluctuates, compared to the method shown in FIG. If the contents of the memory circuit 28 are to be modified, the test switch 27 may be switched and reset.

FIG. 5 is a block diagram of a power supply control device using a digital signal generating circuit according to another embodiment of the present invention, and 529 indicates a pinot l-signal generator.

The focus signal generator 29 is a generator that generates digital signal bits by varying the depth switch or short circuit, and has the same function as the digital signal generation circuit 23 in FIG. The signal sending circuit 17 sends out the digital signal PI* from the signal sending circuit 17 to the reference voltage setting circuit 15 of the power supply unit 71/PSUI-PSUn, and sets the reference voltage in the same manner as described above, and the details are omitted.

tg+ As described in detail of the invention, in a power supply control device that operates multiple power supply units in parallel to supply power to loads of electronic equipment, the output voltage is controlled to be constant by comparing the detection voltage of the output voltage with a reference voltage. A digital signal generated from two continuously variable digital signal generation circuits is sent to the reference voltage setting circuit that sets the reference voltage of each voltage comparison circuit to be used, via a signal transmission circuit, and each voltage is determined by the input digital signal. By adopting the configuration of the present invention that sets the reference voltage, there is an effect that the reference voltage for each of a plurality of power supply units can be easily set simultaneously and continuously.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram for supplying power to a load from multiple power supply unit groups operated in parallel, Figure 2 is a block diagram of the control a11 system configuration between the conventional multiple power supply unit groups and the power supply control device, and Figure 3 1 is a block diagram showing the configuration of a control system between a plurality of power supply unit groups and a power supply control device according to the present invention, and FIGS. 4 and 5 are block diagrams showing the configuration of the power supply control device according to the present invention. In the drawing, P! J1-PStln is a power supply controller, 14 is an error detector, 15 is a reference voltage setting circuit, 17 is a signal sending circuit, 21 is a power supply control device, and 22 is a power supply control section. 23 is a digital signal generation circuit, 24 is a constant voltage source, 25
26 is a digital signal conversion circuit, 27 is a test switch, 28 is a memory circuit, and 29 is a signal generator.

Claims (1)

[Claims] (1,) Parallel operation of a plurality of power supply units each having a voltage comparison circuit that controls the output voltage to be constant by comparing the detection voltage of the output voltage and the reference voltage from the reference voltage setting circuit. In the power supply control device, the power supply control device is equipped with a signal sending circuit that supplies power to a load of an electronic device and sends a digital signal to each of the reference voltage setting circuits to set a reference voltage. A digital signal generation circuit for generating a variable digital signal is provided, and a digital signal from the digital signal generation circuit is sent to each of the reference voltage generation circuits via the signal transmission circuit to set a reference voltage. This is a variable output voltage method. (2) A memory circuit for temporarily storing digital signals is provided in the power supply control device, the digital signal generated by the digital signal generating circuit is temporarily stored in the memory circuit, and the digital signal stored in the memory circuit is The variable output voltage system according to claim 1, characterized in that the output voltage is transmitted from a signal transmission circuit.