JP2006121322A - Switch device and switch control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a switch device which switches ON/OFF as an electric product is powered ON/OFF without being incorporated in the electric product itself, and a control method for a switch. <P>SOLUTION: A computer 206 is connected to a detection-side outlet 205 of the switch device 201, and then when its power source is turned ON, an internal current detecting circuit detects current variation and a switch control circuit performs ON/OFF control over the electric power supplied from a reverse interlocking outlet 208 and an interlocking outlet 209. Consequently, a lamp 211 for lighting connected to the interlocking outlet 209 turns ON when the computer 206 is turned ON and lights out when OFF. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a switch device that is turned on / off in conjunction with an operation of a power supply, and a switch control method.

  It is often convenient to turn on and off other devices in conjunction with computers and home appliances. For example, if you turn on your television in the morning using your remote controller, the room lights will be lit in conjunction with this. However, such switch devices can only be ordered specially or made by themselves.

  FIG. 6 shows a circuit configuration of a part of such a switch device and an electric product. A relay excitation circuit 102 is connected in series with a power switch 101 of an electric product such as a television, and these series circuits are connected to both ends of the commercial power supply 103. Similarly, a series circuit including a room lamp 104 and a relay normally open contact 105 is connected to both ends of the commercial power source 103.

  In such a device, when the power switch 101 of an electric product such as a television is turned on, a current flows through the excitation circuit 102 of the relay, and the normally open contact 105 of the relay is closed. As a result, the electric lamp 104 is turned on. Further, when the power switch 101 of the electrical product is turned off, the relay is demagnetized, so that the normally open contact 105 of the relay is opened and turned off. As a result, the lamp 104 is turned off.

It has also been proposed to control the driving of the switching element using the converted voltage by converting the input current into a voltage using a current transformer (see, for example, Patent Document 1).
Japanese Patent Application Laid-Open No. 5-198369 (paragraphs 0003 and 0004, FIG. 5)

  However, although it is possible in principle to manufacture the switch device as shown in FIG. 6, it is necessary to open the interior of the electrical product and wire the relay, and the product is particularly downsized. In such a case, it is difficult to realize from the viewpoint of the layout space of the relay. In addition, since the electrical product is remodeled, there is also a problem that the purchaser cannot be guaranteed for the product.

  Further, in the proposal according to Patent Document 1 described above, a circuit is incorporated for stopping the heating of the induction heater, and a technique for switching such a special circuit in conjunction with a power supply operation of a general electric product. It cannot be used for.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a switch device and a switch control method that can be turned on / off in conjunction with the operation of a power source of the electrical product without being incorporated in the electrical product itself.

  According to the first aspect of the present invention, (b) current detection means for detecting a change in current of a power supply cord of a specific electrical product or a first power supply path for supplying power to the power supply cord; An electrical product power state detection means for comparing the current detected by the means with a threshold and detecting that the power switch of the electrical product is turned on or off; and (c) the electrical product power state detection means. The switch device is provided with second power supply path on / off control means for controlling on / off of the second power supply path provided separately from the first power supply path according to the detection result.

  That is, according to the first aspect of the present invention, the power cord of a specific electrical product or a change in the current of the first power supply path that supplies power to the power cord is detected and compared with a threshold value as described above. It is determined that the power switch of the electrical product is turned on or off. Then, the second power supply path provided separately from the first power supply path is on / off controlled. Accordingly, it is possible to realize a switch device that is turned on / off in conjunction with the operation of the power source of the electrical product without performing special electrical work or modification of the electrical product.

  According to the seventh aspect of the present invention, (b) a current detection step of detecting a change in the current of a first power supply path for supplying power to a power cord or a power cord of a specific electrical product; Comparing the current detected in the step with a threshold value to detect that the power switch of the electrical product is turned on or off; and (c) detection by the electrical product power status detection step. According to the result, the switch control method includes a second power supply path on / off control step for controlling on / off of the second power supply path provided separately from the first power supply path.

  That is, according to the seventh aspect of the present invention, the change in the current of the first power supply path for supplying power to the power cord or the power cord of a specific electrical product is detected and compared with a threshold value as described above. It is determined that the power switch of the electrical product is turned on or off. Then, the second power supply path provided separately from the first power supply path is on / off controlled. Therefore, it is possible to realize a switch linked to the operation of the power source of the electrical product without performing special electrical work or modification of the electrical product.

  As described above, according to the present invention, a large power supply path such as a power cord of a specific electrical product or a first power supply path for supplying power to the specific electrical product is detected to detect on / off of the power supply, Since the switch is actuated accordingly, it is not necessary to modify the electrical product itself, and the necessary electrical product can be controlled on and off. In addition, since the second power supply path provided separately from the first power supply path is on / off controlled, when one of these power supply paths is direct current and the other is alternating current, the voltages of both are different. The present invention can also be applied in an environment.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows an example of a switch device and its usage in the first embodiment of the present invention. The switch device 201 is housed in a horizontally long rectangular parallelepiped case 202. A power cord 203 is drawn out from the front surface of the case 202, and a power plug 204 at the tip thereof is connected to a commercial power outlet (not shown). A detection-side outlet 205 is provided on the left side surface of the case 202. The detection-side outlet 205 is connected to an electric product to be turned on / off for power supply. In this example, a power plug 207 of a desktop computer 206 is connected. Therefore, in this example, the switch device 201 turns on / off the power supply of other electrical products in conjunction with the power on / off of the computer 206.

  On the upper surface of the case 202, there are provided a reverse interlocking outlet 208 and an interlocking outlet 209 as two outlets for the electric product on the side where the power supply is controlled in this way. Among these, the interlocking outlet 209 is an outlet that performs power supply control that is turned on when the computer 206 is turned on and turned off when the computer 206 is turned off. On the contrary, the reverse interlocking outlet 208 is an outlet that performs power supply control such that when the computer 206 is turned on in this example, it is turned off and turned on when the computer 206 is turned off. In the usage example shown in FIG. 1, the power plug 212 of the illumination lamp 211 is inserted into the interlocking outlet 209. Therefore, in this example, the lighting lamp 211 is turned on when the computer 206 is turned on, and is turned off when the computer 206 is turned off.

  A detection sensitivity setting unit 214 is also arranged on the upper surface of the case 202. The detection sensitivity setting unit 214 is for adjusting the detection sensitivity of power supply ON / OFF of the electrical product connected to the detection-side outlet 205. In many cases, a small amount of electric power is consumed while many electrical products are simply connected to an outlet. Therefore, it is possible to adjust to detect that the main power source is turned on.

  FIG. 2 shows an outline of the circuit configuration of the switch device. The switch device 201 includes a detection-side outlet 205 connected to the commercial power source 221 via the primary side of the transformer 222, and a computer 206 as an electrical product connected to the secondary side of the transformer 222 and connected to the detection-side outlet 205. The current flowing through (FIG. 1) is rectified, the obtained DC voltage is A / D (analog / digital) converted to detect a current value as a digital signal, and the detected current value is A switch control circuit 226 for performing on / off control of the commercial power source 221 by inputting the current value data 224 and the sensitivity setting signal 225 output from the detection sensitivity setting unit 214, and the switch control circuit 226. It is composed of a reverse interlocking outlet 208 and an interlocking outlet 209. Since the switch control circuit 226 directly controls on / off of the commercial power source 221 by controlling the contact of a built-in electromagnetic relay (not shown), depending on the power consumption of the electrical product connected to the reverse interlock outlet 208 or the interlock outlet 209. The detection current of the current detection circuit 223 does not fluctuate.

  The detection sensitivity setting unit 214 includes a DC power source 227 such as a battery and a variable resistor 228 that is interlocked with the knob shown in FIG. 1, and inputs the divided voltage as a sensitivity setting signal 225 to the switch control circuit 226. ing. Of course, the detection sensitivity setting unit 214 may be configured with several selection switches, or may be configured to input detection sensitivity with a numeric keypad.

  FIG. 3 shows a main part of the switch control circuit. The switch control circuit 226 includes an A / D converter 231 that receives the sensitivity setting signal 225 output from the detection sensitivity setting unit 214 illustrated in FIG. 2 and performs A / D conversion. The sensitivity setting data 232 after A / D conversion is input to the comparison circuit 233 together with the current value data 224. The comparison circuit 233 compares both, and when the value of the current value data 224 is larger in absolute value, the power of the electrical product connected to the detection-side outlet 205 (FIG. 2) is turned on. The power-on data 234 shown is output to the relay excitation circuit 235. The relay excitation circuit 235 excites the relay 236 while the power-on data 234 is being output.

  The comparison circuit 233 stops outputting the power-on data 234 when the value of the current value data 224 is an absolute value that is equal to or less than the sensitivity setting data 232. However, in order to prevent frequent on / off of the power-on data 234 due to subtle fluctuations in the current value in the vicinity of the threshold value, the comparison value of the comparison circuit 233 may be provided with hysteresis.

  FIG. 4 shows a circuit portion that performs excitation control by a relay. The commercial power source 221 includes a circuit portion in which a first relay contact 241 that is a normally closed contact in the switch control circuit 226 and a reverse interlocking outlet 208 are connected in series, and a second relay contact 242 that is a normally open contact and an interlocking outlet. 209 is supplied to a circuit portion connected in series. Accordingly, when the computer 206 shown in FIG. 1 is turned on, the second relay contact 242 is turned on, and power is supplied to the lighting lamp 211 (FIG. 1) connected to the interlocking outlet 209. Light. On the other hand, for example, if a television is connected to the reverse interlock outlet 208, the television is automatically turned off when the computer 206 is turned on.

  In this embodiment, the power plug 212 of the illumination lamp 211 is inserted into the interlocking outlet 209. However, the alarm lamp or the buzzer power plug is inserted here, and the detection sensitivity setting unit 214 detects the overcurrent. It is also possible to set to. In this case, for example, when the computer 206 is turned on / off, the alarm lamp or the alarm buzzer does not operate. When an abnormality occurs in the computer 206 and an overcurrent flows, the switch control circuit 226 operates for the first time, and operates the alarm lamp or alarm buzzer to notify the abnormality.

  FIG. 5 shows a case where the switch device according to the second embodiment of the present invention is applied to a DC-driven electric product. The electrical product 301 is, for example, a notebook personal computer, and obtains a DC power supply 302 via an AC (AC) adapter (not shown). A current detection probe 303 is connected to the anode side or the cathode side of the power cord converted into direct current by the AC adapter, and the output side thereof is connected to the current detection circuit 305 of the switch device 304. A switch control circuit 307 incorporating a delay circuit 306 is connected to the output side of the current detection circuit 305. The switch control circuit 307 includes a CPU (Central Processing Unit) (not shown) and a recording medium in which a program is stored, and supplies an output of the commercial power supply 309 controlled to be turned on / off to the outlet 308. ing.

  In such a switch device 304, when the power switch 311 of the electrical product 301 is turned on, a current corresponding to the internal impedance 312 of the electrical product 301 flows through the power cord. The probe 303 for current detection has a Hall element 303B disposed in the gap portion of the annular iron core 303A with a gap. When a current flows through the power cord, a voltage is generated in the Hall element 303B according to the amount. The current detection circuit 305 detects the on / off state of the electrical product 301 based on the change in the magnitude of the voltage.

  Since the switch control circuit 307 incorporates the delay circuit 306, the delay amount can be varied according to user settings. Thus, for example, it is possible to perform control such that the illumination is turned off one minute after the power of the electric product 301 is turned off.

  In the first embodiment of the present invention, AC current detection is performed with the voltage after rectification on the secondary side of the transformer. However, a Hall element similar to the second embodiment or a commercially available one is available. You may make it carry out by using the element for an alternating current detection.

  In addition, the switch device includes a CPU (central processing unit), and naturally, a part of the on / off control of the switch may be performed by software by executing a program.

  Further, the switch device may set two types or a plurality of types of threshold values for current detection. In this case, it is usually used to control a given electrical product in conjunction with turning on or off the electrical product, or both, and to issue an alarm from an alarm device connected to another outlet when an abnormality occurs. It can be carried out.

It is the perspective view showing an example of the switch device in the 1st example of the present invention, and its utilization form. It is a circuit diagram showing the outline | summary of the circuit structure of the switch apparatus in a 1st Example. It is a circuit diagram showing the principal part of the switch control circuit in the first embodiment. It is a circuit diagram showing the circuit part which performs the excitation control by a relay in a 1st Example. It is a circuit diagram showing the case where the switch apparatus in the 2nd Example of this invention is applied to the electric product of a DC drive. It is the circuit diagram showing the circuit structure of a part of switch apparatus and electric product performed conventionally.

Explanation of symbols

201, 304 switch device 206 computer 208 reverse interlock outlet 209 interlock outlet 211 lighting lamp 214 detection sensitivity setting unit 223, 305 current detection circuit 233 comparison circuit 235 relay excitation circuit 301 electrical product 303B hall element 306 delay circuit 307 switch control circuit 308 Outlet

Claims (7)

Current detection means for detecting a change in current of a first power supply path for supplying power to a power cord of the specific electrical product or the power cord;
An electrical product power state detection unit that compares the current detected by the current detection unit with a threshold value to detect that the power switch of the electrical product is turned on or off;
A second power supply path on / off control means for controlling on / off of a second power supply path provided separately from the first power supply path in accordance with a detection result of the electrical product power state detection means; A switch device comprising:   The first power supply path is an AC power supply means, and the current detection means compares the power consumed by the specific electrical product with the threshold value to turn on or off the power switch of the electrical product. 2. The switch device according to claim 1, wherein the switch device is detected.   The first power supply path is a DC power supply means, which converts a current flowing in one direction through a power cord into a voltage using a Hall element, compares the detected voltage with the threshold value, and compares the electric product with the electric product. The switch device according to claim 1, wherein the switch device detects that the power switch is turned on or off.   The switch device according to claim 1, wherein the threshold value is adjustable.   2. The switch device according to claim 1, wherein the threshold value is set to a different value depending on whether the power is on or off.   2. The switch according to claim 1, wherein the threshold value is a value for detecting an overcurrent of the specific electric product, and the second power supply path supplies power to a circuit that issues an alarm. apparatus. A current detection step of detecting a change in current in a first power supply path for supplying power to a power cord of the specific electrical product or the power cord;
Comparing the current detected in this current detection step with a threshold value to detect that the power switch of the electrical product is turned on or off;
A second power supply path on / off control step for controlling on / off of a second power supply path provided separately from the first power supply path in accordance with the detection result of the electrical product power state detection step; A switch control method comprising:

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