JPH07222381A - Power supply - Google Patents

Abstract

PURPOSE:To obtain a power supply which can be operated for a long time while suppressing the influence of noise and which can feed power even if a high voltage is applied to the power receiving side by providing a controller with a light emitting element for converting the electric energy into the optical energy and providing an apparatus to be controlled with a photoelectric conversion element for converting the optical energy into the electric energy. CONSTITUTION:A modulation circuit 186 in a controller 176 receives a control signal from a controller 180 and performs pulse width modulation or intensity modulation for a light emitting element 188. A control signal from the light emitting element 188 is superposed on optical energy and transmitted on an optical fiber 192 to a photoelectric conversion element 176 in an apparatus 160 to be controlled and converted into electric energy. Electric energy outputted from the element 170 is smoothed through a smoothing circuit 172 and fed to a sensor 162, an amplifier 164 and an E/O converter 168. Consequently, power can be fed continuously for a long time even if a high voltage is applied to the power receiving side while suppressing the influence of noise.

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, and more particularly to a power supply device for supplying electric power consumed by a controlled device with light energy.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
FIG. 1 is a block diagram of a measuring device using a power supply device according to a first conventional technique. The controlled device 100 includes the sensor 1
02 and amplifier 104. The sensor 102 and the amplifier 104 are connected to the control device 1 by a conductive cable 108.
10 is connected to the controller 112. The controller 112 is connected to the display device 114. Further, the controller 112 uses the sensor 102 in the controlled device 100.
Also connected to the amplifier 104 by a control cable 118. The power supply 116 in the control device 110 is connected to the controller 112 and the display device 114. Also, power source 1
16 is also connected to the sensor 102 and the amplifier 104 in the controlled device 100 by the power cable 120.

The operation of the measuring apparatus will be described below. The sensor 102 converts information on physical quantities such as voltage, current, power, temperature, humidity and pressure and chemical quantities such as gas and ions into electric signals, and then the cables. Controller 112 via 108
Output to. The level of the electric signal output from the controlled device 100 is adjusted by the controller 112 controlling the sensor 102 and the amplifier 104 via the control cable 118. Further, the controller 112 displays the physical quantity or the chemical quantity on the display device 114 based on the electric signal transmitted from the controlled device 100. Controlled device 100
The power consumed inside is supplied from a power supply 116 in the control device 110 by a power cable 120.

However, the controlled device 100 and the control device 1
10 apart, cable 108 control cable 118
Also, when the power cable 120 is lengthened, it becomes very susceptible to electromagnetic noise. Further, the controlled device 100
There is a problem that the control device 110 is broken when a high voltage is applied to the ground.

FIG. 6 is a block diagram of a second conventional measuring apparatus which overcomes the above problems. Circuits having the same functions as those in FIG. 5 are designated by the same reference numerals. Sensor 1
An amplifier 104 is connected to 02. An E / O converter 130 that converts an electric signal into an optical signal is connected to the amplifier 104. The E / O converter 130 includes an optical fiber 13
The O / E converter 134 in the control device 110 is connected via the line 2. The O / E converter 134 includes a controller 11
2 is connected and the display device 11 is connected to the controller 112.
4 is connected. In addition, the controller 112 is an E / O device that converts an electric signal into an optical signal and transmits it to the controlled device 100.
The converter 136 is connected. The E / O converter 136 is connected to the O / E converter 140 of the controlled device 100 via the optical fiber 138. The O / E converter 140 is connected to the control circuit 142. The power supply 143 is the control device 11
It is connected to the controller 112, the display device 114, the O / E converter 134, and the E / O converter 136 in 0.

The operation of the measuring device using the power supply device according to the second conventional technique will be described below.
Converts information on physical quantities such as voltage, current, power, temperature, humidity and pressure, or chemical quantities such as gas and ions into electric signals. The electric signal output from the sensor 102 is supplied to the amplifier 10
4 to the E / O converter 130. The optical signal output from the E / O converter 130 is transmitted to the O / E converter 134 in the control device 110 by the optical fiber 132. The optical signal from the optical fiber 132 is the O / E converter 1
It is converted into an electric signal at 34 and input to the controller 112. The controller 112 displays the physical quantity and the chemical quantity on the basis of the electric signal from the O / E converter 134.
Display in 4. The controller 112 also controls the states of the sensor 102 and the amplifier 104 of the controlled device 100. The control signal output by the controller 112 is E /
Input to the O converter 136. The control signal is converted into an optical signal by the E / O converter 136. The optical signal output from the E / O converter 136 is transmitted via the optical fiber 138 to the controlled device 1
00 to the O / E converter 140. The optical signal is converted back into an electric signal by the O / E converter 140, and the control circuit 14
Enter 2. The control circuit 142 uses the O / E converter 140.
A signal from the sensor 102 and the amplifier 104 is controlled.

Optical fibers 132 and 138 as transmission lines
The controlled device 100 and the control device 110 are used.
Even if the distance between them is extended, they are not easily affected by electromagnetic noise, and even if a high voltage is applied to the controlled device 100, the control device 11
Since it is electrically insulated from the 0 side, a high voltage may be applied to the controlled device 100. However, the power supply 143 of the control device 110 cannot supply power to the controlled device 100.

Therefore, the power source 146 of the controlled device 100 must be separately provided. There are two methods of supplying electric power to the controlled device 100: a method using an insulating (floating) power source and a method using a battery. When a high voltage is applied to the controlled device, the isolated power supply must have a high withstand voltage, and is extremely expensive and large. Also, it is easily affected by noise.

If the influence of noise and the withstand voltage still pose a problem even when the above-mentioned insulated power source is used, a primary battery or a secondary battery is used. However, when a primary battery is used, it must be replaced after discharging, and when a secondary battery is used, it must be charged. Therefore, power cannot be continuously supplied for a long time.

An object of the present invention is to provide a power supply device which solves the above-mentioned problems, can be used for a long time, is hardly affected by noise, and can supply power even when a high voltage is applied to the power supplied side. It is to be. Another object of the present invention is to downsize the controlled device.

[0011]

In order to solve the above-mentioned problems, the present invention provides a control device with a light emitting element for converting electric energy into light energy, and the controlled device converts light energy into electric energy again. A photoelectric conversion element for conversion is provided to supply power. Since the control device and the controlled device are electrically insulated, even if a high voltage is applied to the controlled device, the control device side is not affected. Further, it can be used continuously for a long time without being affected by noise.

[0012]

FIG. 1 is a block diagram of a measuring device using a first power supply device according to the present invention. Controlled device 160
Is a sensor 162, an amplifier 164, an E / O converter 16
8, a photoelectric conversion element 170, a smoothing circuit 172, and a control circuit 174. An amplifier 164 is connected to the sensor 162, and an E / O converter 168 is connected to the amplifier 164. The control device 176 includes an O / E converter 178, a controller 180, a display device 182, a power supply 184, a modulation circuit 186, and a light emitting element 188. Controlled device 160
The E / O converter 168 of the
It is connected to the E converter 178. Further, the light emitting element 188 of the control device 176 is connected to the photoelectric conversion element 170 of the controlled device 160 by the optical fiber 192.

The power supply 184 is within the controller 176.
The modulation circuit 186 receives a control signal from the controller 180 and performs pulse width modulation or intensity modulation on the light emitting element 188. The light energy from the light emitting element 188 on which the control signal is superimposed is transmitted to the photoelectric conversion element 170 by the optical fiber 192. The photoelectric conversion element 170 converts the light energy into electric energy. The electric energy output from the photoelectric conversion element 170 is the smoothing circuit 1
Smoothed at 72, sensor 162, amplifier 164 and E
Power is supplied to the / O converter 168.

The control circuit 174 is connected to the photoelectric conversion element 170, demodulates a control signal, and controls the states of the sensor 162 and the amplifier 164 in the controlled device 160. In the circuit of FIG. 1, two photoelectric conversion elements in the controlled device 160 are used.
One may be used for power supply and the other for control signal.
In this case, separate elements can be used, such as solar cells for power supply and photodiodes or phototransistors for control signals. In this case, control signal communication can be performed at high speed.

When the same photoelectric conversion element is used, it is possible to appropriately distribute energy by setting the area ratio of received light to 99% for power supply and 1% for control signal.

If the timing at which the light emitting element 188 emits light and the timing at which the E / O converter 168 emits light are staggered in time division, the control device 176 and the controlled device 16 are separated.
The number of optical fibers between 0 may be one.

FIG. 2 is a block diagram of a measuring device using the second power supply device according to the present invention. Circuits having the same functions as in FIG. 1 are designated by the same reference numerals. The difference from the measuring device using the first power supply device of FIG.
76 has the second light emitting element 200, and the controlled device 160 has the second photoelectric conversion element 202.

The first light emitting element 204 converts electric energy from the power source 184 into light energy. The light energy is transmitted to the first photoelectric conversion element 202 by the optical fiber 206. The first photoelectric conversion element 202 converts light energy into electric energy, and the sensor 162 in the controlled device 160,
Power is provided to amplifier 164 and E / O converter 168.

The modulator 208 receives the control signal from the controller 180 and modulates the output light of the second light emitting element. The light output of the second light emitting device 200 is the first to deliver power.
Unlike the light emitting element 204, information is transferred to the second photoelectric conversion element 21.
It only needs to be strong enough to be transmitted to zero. The optical output of the second light emitting element is output by the optical fiber 212 to the second photoelectric conversion element 210.
To enter. The output signal of the second photoelectric conversion element 210 is input to the control circuit 174, and the control circuit 174 causes the controlled device 1 to operate.
Controls the state of sensor 162 and amplifier 164 in 60.

In FIG. 2, two optical fibers 206 and 2 are provided.
12 is used, but the emission wavelengths of the first light emitting element and the second light emitting element are transmitted to the controlled device as different wavelengths, for example, infrared light and visible light, respectively, through one optical fiber, and the controlled device side transmits an optical filter. , May be separated by using a spectral filter, a prism, or a photoelectric conversion element having a spectral characteristic. As a result, the optical fibers 206 and 216 can be combined into one.

Further, if a time division method is used in which the timings of light emission of the E / O converter 168, the first light emitting element 204 and the second light emitting element 200 are shifted, the number of optical fibers between the control device 176 and the controlled device 160 is 1. It may be a book.

FIG. 3 is a block diagram of an earphone device using the first power supply device according to the present invention. The optical fiber 2 is provided between the CD player section 230 and the earphone section 232.
Connected at 34. The signal detection unit 236 of the CD player unit 230 detects the digital signal of the compact disc 238. The digital signal is added by the adder circuit 240 to the voltage from the offset voltage generating section 242 to be a signal having a voltage value of only + side or − side. Adder circuit 240
Output voltage is converted into light energy by the light emitting element 244. The optical energy output from the light emitting element 244 is transmitted to the earphone unit 232 by the optical fiber 234.
The light transmitted to the earphone unit 232 is converted into electric energy for power supply by the first photoelectric conversion element 246 and converted into electric signal for voice reproduction by the second photoelectric conversion element 248.

The electric energy from the first photoelectric conversion element 246 is stored in the charging circuit 250. The electric signal from the second photoelectric conversion element 248 is supplied to the digital / analog converter 2
It is input to 52 and converted into an analog signal. The analog signal from the digital / analog converter 252 is amplified to a desired amplitude by the amplifier 254 and drives the earphone 256. Digital-analog converter 252 and amplifier 2
The power consumed by 54 is supplied by the charging circuit 250.

Since the CD player section 230 transmits the power consumption of the earphone section 232 as optical energy through the optical fiber 234, even if the distance between the CD player and the earphone is long, hum and electromagnetic noise from the commercial power supply line are picked up. There is nothing to do.

FIG. 4 is a block diagram of an active probe using the first power supply device according to the present invention. The probe head unit 270 has an attenuator 272, a differential amplifier 274, a laser 276, an O / E conversion unit 278, and a power supply unit 280, and is connected to the connector unit 282 by two optical fibers 284 and 286. There is. The connector portion 282 is O /
It has an E converter 288 and a light emitting element 290. Resistors R1 and R2 as an attenuator 272 are connected between the probe tip 288 and the ground clip 290. The voltage-divided signal is amplified by the differential amplifier 274 and modulates the light intensity of the laser 276. The output light from the laser is input to the O / E converter 288 of the connector unit 282 through the optical fiber 286. In the O / E converter 288, the optical signal is converted into an electric signal again and the probe chip 2
Regenerates the voltage between 88 and ground clip 290.
The power consumed by the differential amplifier 274 and the laser 276 in the probe head unit 270 is supplied as light energy from the light emitting element 290 in the connector unit 282 via the optical fiber 284. The connector 282 is supplied with power from the oscilloscope body. Light energy is O
/ E conversion unit 278 converts into electric energy, and power supply unit 2
80 is output. The power supply unit 280 includes a capacitor or a storage battery that stores electric energy.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments described herein, and various modifications and changes can be made as necessary without departing from the gist of the present invention. It will be apparent to those skilled in the art that changes can be made.

For example, in the power supply apparatus of the above-mentioned embodiment, the optical energy is transmitted between the control device and the controlled device by using the optical fiber. However, when a laser having a small beam width is used, it can be transmitted by space. Good.

In the above embodiments, the light emitting element is a laser and a light emitting diode, but any incandescent lamp, discharge tube or the like may be used as long as it can convert electric energy into light energy.

In the embodiment shown in FIG. 3 described above, the signal transmitted from the CD player section 230 to the earphone section 232 is a digital signal, but the D / A is provided between the audio signal detection section 236 of the CD player section 230 and the adder circuit 244. A converter may be provided to transmit the analog signal. In this case, the D / A converter 252 in the earphone unit 232 is unnecessary.

[0030]

Since the present invention is constructed as described above, it has the following effects.

It is possible to provide a power supply device which is not easily affected by noise, can supply power even when a high voltage is applied to the power supply device side, and can be continuously used for a long time.

Since the power source only needs to be prepared on the control device side, the controlled device can be miniaturized.

[Brief description of drawings]

FIG. 1 is a block diagram of a measuring device using a first power supply device according to the present invention.

FIG. 2 is a block diagram of a measuring device using a second power supply device according to the present invention.

FIG. 3 is a block diagram of an earphone device using the first power supply device according to the present invention.

FIG. 4 is a block diagram of an active probe using the first power supply device according to the present invention.

FIG. 5 is a block diagram of a measuring device using a power supply device according to a first conventional technique.

FIG. 6 is a block diagram of a measuring device according to a second conventional technique.

[Explanation of symbols]

 Reference numeral 160 Control device 170 Photoelectric conversion element 176 Controlled device 188 Light emitting element 200 Second light emitting element 202 First photoelectric conversion element 204 First light emitting element 210 Second photoelectric conversion element

Claims (3)

[Claims] 1. A controlled device, comprising: a light emitting element for converting an electric signal into an optical signal; and a controlled device, which is provided with a photoelectric conversion element for converting the optical signal into an electric signal again. A power supply device characterized in that the photoelectric conversion element supplies power consumed by the device. 2. A first light emitting element provided in a control device for converting electric energy into light energy having a first wavelength, and an electric signal provided in the control device for converting an electric signal into an optical signal having a second wavelength. A second light emitting element, a first photoelectric conversion element provided in the controlled device for converting the light energy into electric energy again, and a second photoelectric conversion element for converting the light signal into an electric signal again, A power supply device, wherein the first photoelectric conversion element supplies the power consumed by the controlled device. 3. A light emitting element provided in a control device for converting an electric signal into an optical signal; a first photoelectric conversion element provided in a controlled device for converting the optical signal into electric energy; A second photoelectric conversion element for converting into an electric signal, wherein the first photoelectric conversion element supplies electric power consumed by the controlled device.