JPS5936827A - Method for detecting voltage of power supply device - Google Patents

Abstract

PURPOSE:To supply precisely voltage without any influence due to disturbance noises by converting the voltage to be supplied to a load into an optical signal by a voltage/optical signal converting device and transmitting the optical signal to a power supply device through an optical fiber. CONSTITUTION:The voltage to be supplied to the load is converted into an optical signal by the voltage/optical signal converting device and the converted optical signal is transmitted to the power supply device through the optical fiber. For instance, the output voltage of a voltage regulator 11 in a regulated power supply device 1 is supplied from a power supply terminal 5 to a load 3 by a power supply line 14 through a power supply terminal 4 on the load side. Subsequently, the voltage of the power supply terminal 4 is converted into a series digital signal by an A/D converter 7, the digital signal is converted into an optical pulse signal by a transmitter 8 and the optical pulse signal is divided into prescribed time frames, which are transmitted to the regulated power supply device 1 through the optical fiber 6. The transmitted signal is converted into a digital signal by a receiver 9 and then the digital signal is converted again into the original load terminal voltage by a D/A converter 10 to feedback the voltage to the voltage regulator 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a voltage in a power supply device, and more specifically, to a method for feeding back the voltage supplied to a load to a voltage regulator in a power supply device. .

When it is necessary to supply a specified and reliable voltage to the load, or when the supply line is thick and the distance between the power supply and the load is relatively long, use the power supply line. If the effect of voltage drop caused by frost or air resistance cannot be ignored, connect the voltage detection line that detects the voltage at the load terminal between the power supply and the vicinity of the load terminal to the power supply line. It was common practice to compensate for the voltage drop in the power supply line by wiring the line separately and feeding the load terminal voltage directly back to the voltage regulator in the power supply.

In other words, as shown in Figure 1, the output voltage of the voltage regulator (11) in the stabilized power supply (1) is connected to the power supply terminal (from the power supply line C1 → to the power supply terminal (4) on the load side). Power is supplied to the load (3) via the power supply line 0.
41d has a small electrical resistance, and due to the voltage drop due to kneading, the voltage at the load terminal becomes slightly lower than the output voltage of the stabilized power supply. This error becomes particularly large when the amount of current supplied is large and the distance between the power supply and the load is long.

In order to compensate for this error, the load power supply terminal (4)
It is generally practiced to wire a voltage detection line (13) directly from the vicinity of the power supply device to the voltage detection terminal (121) of the power supply device, and feed back the terminal voltage of the load directly to the voltage regulator αυ.

However, in order to prevent a potential difference between the two ends of this voltage sensing line, almost no current can flow through it, and the input impedance on the power supply side must be quite high, causing inductive noise. ＃Wo-dog listening was easy. Additionally, wiring was often forced to run parallel to the power supply line, resulting in frequent abnormal voltages and oscillations.

For the above reasons, such a method is not used in normal use where extreme accuracy is not required, and U! 2shi1
As shown in Figure 2, the general method of use is to short-circuit the power supply terminal (5) and the voltage detection method ring on the power side and to directly feed the output voltage to the voltage regulator, or to not provide a voltage detection method. there were.

The present invention has been made based on the above-mentioned circumstances, and its gist is that instead of feeding back the voltage at the end of the load through a voltage detection line, a voltage-to-optical signal conversion method is used near the power supply terminal of the load. A voltage detection method for power supply equipment that enables accurate voltage supply without being affected by disturbance noise by connecting the equipment, converting the voltage supplied to the load into an optical signal, and transmitting it to the power supply equipment via optical fiber. We are here to provide you with the following.

Now, the content of the present invention will be clarified based on the drawings.

FIG. 3 shows a schematic circuit block diagram showing an example of the present invention. The voltage-optical signal converter on the load side is A-D (
It is basically composed of an analog-to-digital converter (7) and an optical transmitter (8). First, the voltage at the power supply terminal (4) is converted into a serial digital signal by an A-D converter (power).Next, the digital signal is converted into an optical/radial signal by an optical transmitter (8) and a constant It is divided into time frames and transmitted to the stabilized power supply (1) via all optical fibers (6).On the other hand, the power supply side consists of a D-AC digital-to-analog converter αO and an optical receiver (9). An optical signal-to-pressure conversion device is provided. The optical pulse signal is received by the receiver (9) and converted into a digital voltage (D number), and the D-A conversion t'= (at 11, the original load end -
Returns to the f voltage and is turned on to the voltage regulator (lυ).

In the above process, the accuracy of the stabilized power supply depends on the conversion speed and number of bits (resolution) of the A-D converter, [)-A converter.
It is heavily influenced by. Also, if the distance between the power supply and the power source is relatively short and the amount of optical attenuation when passing through the optical fiber is not a big problem, the voltage may be transmitted as an analog value without being digitized. This simplifies the circuit configuration.

Furthermore, although the present invention refers only to a DC stabilized power supply, the method of foot-knocking the terminal voltage 1 of the load to the power supply side using optical fibers can also be applied to a DC stabilized power supply. Of course.

As explained in detail above, in the present invention, when supplying voltage from a stabilized power supply to a load, in order to compensate for the potential difference between both ends caused by frost and electrical resistance of the power supply line,
Feed the terminal voltage of the load by the voltage sensing wire used/? , one optical signal is sent via optical fiber instead of two! It has a circuit configuration that can provide feedback to the power supply device, and can detect frost, pressure, etc.
)', the influence of induced noise is significantly reduced, making it possible to provide a more accurate and stable voltage supply.

[Brief explanation of the drawing]

1 and 2 are schematic connection diagrams of a stabilized power source and a load in a conventional example, and FIG. 3 is a schematic circuit block diagram of a stabilized power source showing an example of the present invention. In the figure, 3...load, 11...voltage regulator,
13...Optical fiber-114...Power supply line, 8
...Transmitter, 9...Receiver. Applicant Fujikura Electric Wire Co., Ltd.

Claims (1)

[Claims] 1) A voltage-to-optical signal converter converts the voltage near the power co-supply terminal of the load into a υ optical signal, transmits the optical signal to the power supply side via an optical fiber, and further converts the optical signal into an optical signal. Signal-1b1 pressure conversion'@
1. A pressure detection method for a power supply device for heavy machinery, which comprises: converting the optical signal into a voltage using a power supply device, and then feeding back the voltage near the power co-supply terminal to a voltage regirator of the power supply device.