JP2014107726A - Power circuit for electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply reduce standby power to zero without employing a complicated circuit configuration in an electronic apparatus operated with an infrared remote control.SOLUTION: While the electronic apparatus is on standby, a transistor 8 is off to cut off a power supply or ground, so that standby power is zero. A photodiode 6, on receiving power-up infrared radiation 2, causes a clockwise flow of current to a loading resistor 7. After the current or a voltage of the loading resistor turns on the transistor 8, an on-holding section 9 in turn holds the transistor 8 on. An electronic apparatus body 11 is now powered up, and the user recognizes the electronic apparatus 13 to be started up and releases a power key on the infrared remote control 1. On a power-off instruction, the on-holding section 9 turns off the transistor 8 to return to the standby state with zero power consumption.

Description

  The present invention relates to a power supply circuit for an electronic device that can receive an infrared ray transmitted from an infrared remote controller and can reduce standby power of an electronic device that connects or disconnects power to zero.

  Even if the electronic device is turned off by the infrared remote controller, it always supplies power to receive instructions from the remote controller or to download the program guide on a digital TV. Need to continue. Such power is called standby power, and the ratio of the standby power to the total power consumed in homes and companies is about 10%. Therefore, reduction of standby power has become a very important issue for energy problems and the global environment.

  If the automatic download function such as the program guide is given up and the electronic device is completely turned off, the standby power can be reduced to zero. However, it takes a lot of time to unplug the power outlet or turn off the tap to completely turn off the power, so it is difficult to implement it regularly. Therefore, it is desirable that the operation of the electronic device and the standby power can be turned off in a unified manner by the infrared remote controller that is normally used to move the electronic device.

Against this background, devices and methods for reducing standby power related to infrared remote controls have been developed in various ways, which are described below.
Patent Document 1: A method is described in which standby power is reduced by intermittently switching a microcomputer of a reception unit between a sleep state and an operation state using a timer.

  Patent Document 2: Only the comparator provided in the infrared receiving circuit is always energized. A method is described in which a switch of an electronic device is turned on when a comparator detects that an electromotive force of a light receiving element (photodiode) that has received infrared rays transmitted from a remote controller exceeds a certain voltage.

  Patent Document 3: Infrared light sent from a remote controller is converted to a high voltage by a uniquely developed light receiving diode provided in the infrared light receiving circuit. The high voltage is further amplified and pulsed, and the light receiving unit and the power supply control unit are separated by a photocoupler. In the power supply control unit, a method is described in which a thyristor or an electromagnetic relay is operated by a pulse to turn on a switch of an electronic device. Note that power is supplied from the outside to photocouplers, thyristors, and electromagnetic relays that cannot be covered by the power generated by the light receiving diodes.

  However, the above-described prior arts of Patent Document 1, Patent Document 2, and Patent Document 3 require that a certain part is always energized in the standby state, and the standby power cannot be reduced to zero. For example, in Patent Document 1, it is necessary to keep the timer energized at all times, and it is necessary to supply power for the entire microcomputer to operate every certain time for a certain time. In Patent Document 2, it is necessary to energize the comparator at all times. In Patent Document 3, it is necessary to continuously energize a photocoupler, a thyristor, and an electromagnetic relay that cannot be covered only by the power converted from the light receiving diode.

  Patent Document 4: A radio wave is emitted from a remote controller, and an electromotive force is generated by an antenna provided in the electronic device, thereby turning on the electronic device. A method is described in which standby electric power is supplied to an electronic device whose switch is turned on, and an infrared receiving circuit is also set in a receivable state.

  However, in Patent Document 4, since an additional radio wave transmission / reception circuit is added in addition to the infrared transmission / reception circuit, the structure becomes complicated and the cost increases.

  Patent Document 5: Although not directly related to an infrared remote controller, an invention in which infrared is applied to an ID tag that does not require power is described. This is to send out the ID tag to the reader by the electromotive force generated from the photodiode that receives the infrared rays irradiated by the tag reader.

  However, in the infrared ID tag of Patent Document 5, power is sent from the reader to the ID tag, and information is sent from the ID tag to the reader using the power. That is, it cannot be applied to a remote controller that needs to send information and power from the remote controller toward the electronic device.

JP 2012-135036 A JP 2009-267896 A JP 2003-219484 A JP 2000-92754 A JP 2006-153828 A

  The present invention has been made in view of the above-described problems and limitations, and is a circuit that is always energized in a standby state without adding an additional radio wave transmission / reception circuit in addition to an infrared transmission / reception circuit. The purpose is to realize a standby state in which the power consumption of the electronic device body to be operated can be controlled by the electromotive force of the photodiode that receives the infrared rays emitted from the remote control, and the power consumption is reduced as much as possible. It is said.

  The power supply circuit of the electronic device of the present invention receives the power-on infrared light transmitted from the infrared remote controller and connects the power supply of the electronic device, and receives the operation infrared light to operate the electronic device. The electronic device includes an electronic device main body provided with an operation infrared receiving unit that receives operation infrared light, and an infrared power supply unit provided inside or outside the electronic device main body. The infrared power-on unit is connected in series between the infrared power-on detection unit that receives the power-on infrared ray transmitted from the infrared remote controller and the power source and the electronic device body, or in series between the electronic device body and the ground. A transistor that is connected and is turned on when receiving power-infrared light, and an ON holding unit that detects that the transistor is turned on when the transistor is turned on and keeps the transistor on. The electronic device body to be operated is turned on by the transistor that is kept on, and after the power is turned on, the electronic device is operated by the operation infrared light received by the operation infrared receiving unit.

  The infrared power-on detection unit is composed of one or more photodiodes that receive infrared rays transmitted from the infrared remote controller, and load resistors connected in parallel at both ends thereof. The power-on infrared is a continuous infrared that keeps the light source on, and the operation infrared is a code signal infrared modulated by a pulse wave. The electronic device main body that has received an instruction to turn off the power via the operating infrared rays outputs an off signal to the on-holding unit to stop the driving of the transistor, thereby turning off the power of the electronic device main body.

  In addition, a switch for connecting or disconnecting the power supply or ground of the electronic device main body can be provided separately from the transistor, whereby the switch is connected after the on-holding unit is activated, and the power supply to the electronic device main body is provided. .

  Further, the on-holding portion can be constituted by a capacitor. The capacitor is charged by a transistor that is turned on when the power-on infrared light is received, and the transistor is continuously turned on by the capacitor charging voltage during the period until the capacitor is discharged in addition to the light-receiving infrared light receiving period.

According to the present invention, the following effects (1) to (4) can be obtained.
(1) In the standby state, it is possible to eliminate a portion that needs to be energized in all of the electronic device and the infrared receiving circuit.
(2) The number of parts is small, the structure is simple, and the manufacturing cost can be reduced.
(3) The parts used are widespread, the operation characteristics are well known, and they are easily available and inexpensive.
(4) Information and power can be sent from the remote control to the electronic device, and further, the operation of the electronic device and the energization and disconnection of the power supply can be performed uniformly by a single infrared remote control. That is, the present invention can select and use general parts that are easily available, inexpensive, and well-known in operating characteristics without restriction, and has a simple structure. A power supply circuit can be easily realized.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining 1st Embodiment of the power supply circuit of the electronic device which embodies this invention, (a) is an example by which a power supply is cut | disconnected and connected by a transistor in (b), and (b). It is a figure explaining 2nd Embodiment of the power supply circuit of the electronic device which embodies this invention, (a) is an example which cut | disconnects and connects the power supply of the electronic device main body 11 with the switches 14, such as a relay, (b) is an example in which the ground wire of the electronic device main body 11 is disconnected and connected by the switch 14. It is a figure explaining 3rd Embodiment of the power supply circuit of the electronic device which embodies this invention, (a) is an example which cut | disconnects and connects the power supply of the electronic device main body 11 with the transistor 8, (b) These are examples in which the ground of the electronic device main body 11 is disconnected and connected by the transistor 8.

  Hereinafter, the present invention will be described based on examples. FIG. 1 is a diagram for explaining a first embodiment of a power supply circuit of an electronic device embodying the present invention, in which (a) is a power source and (b) is an example in which a ground is disconnected and connected by a transistor. is there. In the illustrated power supply circuit, the electronic device 13 includes an electronic device main body 11 and an infrared power supply unit 4 provided inside or outside thereof. The infrared power-on unit 4 and the electronic device main body 11 may be combined into one electronic device 13 in the same housing, or the infrared power-on unit 4 and the electronic device main body 11 may be housed in separate housings. It may be 13. The infrared power supply unit 4 may be an optional product purchased separately.

  The electronic device main body 11 is provided with a code receiving unit 12 for infrared operation, while the infrared power-on unit 4 is provided with an infrared power-on detection unit 5. The power supply 10 of the electronic device is supplied to the power supply terminal Vcc of the electronic device main body 11 and the ON holding unit 9-1. The transistor 8 is connected in series between the power supply 10 of the electronic device and the power supply terminal Vcc of the electronic device main body 11 (FIG. 1A), or in series between the ground terminal GND of the electronic device main body 11 and the ground G. They are connected (FIG. 1 (b)). The infrared power-on detection unit 5 includes one or more photodiodes 6 having one end grounded to receive the infrared rays 2 transmitted from the infrared remote controller 1, and a load resistor 7 connected in parallel to both ends thereof. When the photodiode 6 receives the infrared ray 2, it generates a reverse current clockwise toward the load resistor 7 and generates a potential across the load resistor. This potential or reverse current is applied to the gate of the transistor 8, and as a result, the power supply 10 (FIG. 1A) or the ground G (FIG. 1B) is connected to the electronic device main body 11 and the ON holding unit 9-. Connect to 1.

  The power supply circuit illustrated in FIG. 1 includes an on-holding unit 9-1 that holds the transistor 8 on. The on-holding portion 9-1 is connected in parallel with the electronic device main body 11 and, therefore, is connected between the power supply 10 and the ground G via the transistor 8 as in the electronic device main body 11. When the transistor 8 is turned on by the electromotive force of the photodiode 6 that receives the infrared ray 2 corresponding to power-on, this on-state is detected and the on-holding unit 9-1 connected to the power supply 10 or the ground G is activated. The on-holding unit 9-1 continues to turn on the transistor 8. As a result, the power source of the electronic device main body 11 to be operated is turned on. After the power is turned on, the electronic device is operated and the power is turned off by infrared rays 3 corresponding to key operations.

  Next, the remote control operation of the power supply circuit of the electronic apparatus illustrated in FIG. 1 will be described in more detail. The infrared remote controller 1 transmits infrared rays 2 corresponding to power-on and infrared rays 3 corresponding to other key operations from an infrared light source provided therein. When the user presses the power-on key of the remote controller, infrared rays 2 are emitted, which are continuous lights in which the light source is continuously lit as illustrated in the upper part of each figure. When the user presses a key other than the power-on key of the remote controller, infrared rays 3 that are code signal light modulated by a pulse wave such as 38 KHz indicating the key code are emitted. This is the same as the code signal infrared of a general infrared remote controller.

  The infrared power-on detection unit 5 of the infrared power supply unit 4 receives the infrared rays 2 transmitted from the infrared remote controller 1 by one or more photodiodes 6 therein. When the photodiode 6 receives the infrared ray 2, it generates a reverse current clockwise toward the load resistor 7. This reverse current or the potential across the load resistor is connected to the power source 10 (FIG. 1 (a)) or the ground G (FIG. 1 (b)) via the gate driving diode from the photodiode 6. Turns on. The intensity of the infrared rays 2 and the number of photodiodes 6 are set to a sufficient intensity and number to drive the transistor 8 to be used.

  When the transistor 8 is turned on, the on-holding unit 9-1 is activated by the power supply 10 of the electronic device in FIG. 1A, and a current path is formed between the power source and the ground of the on-holding unit 9-1 in FIG. Therefore, the on-holding unit 9-1 is activated. The on-holding unit 9-1 is a circuit block including a capacitor, a microcomputer, and the like, and is driven via the Ton terminal of FIG. Hold. As a result, since a current path is always formed from the power supply 10 to the ground G with respect to the electronic device main body 11 to be operated, the electronic device main body 11 is energized and operates.

  As described above, the electronic device main body 11 is activated in a state where the user is pressing the power-on key of the infrared remote controller 1, and the user who confirms the release releases the power-on key. Then, the infrared rays 2 disappear, and the photodiode 6 does not generate a reverse current. However, since the ON holding unit 9-1 continues to turn on the transistor 8, the electronic device body 11 continues to be energized.

  Once the power is turned on as described above, the user presses the other operation keys of the infrared remote controller 1 to operate the electronic device 13 via the modulated infrared 3 as usual. Since the infrared ray 3 is modulated by a pulse, a sufficient amount of light cannot be given to drive the photodiode 6. Further, since the infrared ray 2 is not modulated, the infrared code receiving unit 12 of the electronic device main body 11 is not erroneously detected as a code. That is, it is not necessary to provide an infrared light emitting circuit in the infrared remote controller 1 for power-on and key operation transmission.

  When the user turns off the electronic device 13, he or she presses the power off key of the infrared remote controller 1 or presses the power on key again, and turns off the power to the electronic device main body 11 via the infrared light 3 that is a code signal light. To be notified. Upon receiving the power-off instruction, the electronic device body 11 outputs an off signal OFF to the on-holding unit 9-1 to stop driving the transistor 8. Then, the transistor 8 is turned off, and the power supply or ground is disconnected. As a result, the current path of the electronic device main body 11 is eliminated and the power supply is completely turned off. In the state where the power is turned off, the infrared power supply unit 4 does not consume any power, and the electronic device main body 11 also has no current path from the power source to the ground, so the electronic device 13 does not consume standby power.

  FIG. 2 is a diagram for explaining a second embodiment of a power supply circuit for an electronic device embodying the present invention. FIG. 2A shows an example in which the power supply of the electronic device main body 11 is disconnected and connected by a switch 14 such as a relay. (B) is an example in which the ground wire of the electronic device main body 11 is disconnected and connected by the switch 14. In the second embodiment, the power supply 10 (FIG. 2A) or the ground G (FIG. 2B) of the electronic device main body is connected / disconnected separately from the transistor 8 of the infrared power supply unit 4. A switch 14 such as a relay is provided, and thus, after the ON holding units 9-2 and 9-3 are activated, the switch 14 is connected via the ON output signal Son, and the electronic device main body 11 is powered on. In the second embodiment, the power required for the electronic device main body 11 is large, and when the transistor 8 cannot be simply connected in series to the power source or the ground, that is, the leakage current when the transistor 8 is off cannot be ignored. This is effective when the current flowing through the power supply or the ground when the transistor 8 is on is too large.

  As in the description of FIG. 1, when the power on key of the infrared remote controller 1 is pressed, infrared light 2 that is continuous light corresponding to power-on is transmitted. As a result, the transistor 8 is turned on, and in FIG. 2 (a), the power supply (V1 in FIG. 2 (a)) is supplied from the power supply 10 through the transistor 8 to the ON holding section 9-2. 8, a current path is formed between the power supply 10 and the ground (G1 in FIG. 2B), so that the ON holding unit 9-3 is activated. The on-holding units 9-2 and 9-3 are small power circuits such as a microcomputer, for example, and only a current of several mA to several hundred mA flows through the transistor 8.

  The activated on-holding units 9-2 and 9-3 have a high withstand voltage (high voltage) such as a relay that cuts off the power source or the ground of the electronic device main body 11 while turning on the transistor 8 via the Ton terminal of FIG. The switch 14 (which can also be used for voltage and large current) is turned on by driving the Son terminal in FIG. As a result, the electronic device main body 11 is energized. While the switch 14 is turned on, the ON holding unit 9-2 sets its own power supply 10 to the switch 14 side (V2 in FIG. 2A), and the ON holding unit 9-3 sets its own ground G to the switch 14 side. Switching to (G2 in FIG. 2B), the transistor 8 is turned off. As a result, the electronic device 13 including the electronic device body 11 and the ON holding unit 9 continues to operate with the power supply 10.

  When the user instructs the electronic device main body 11 to turn off the power from the infrared remote controller 1, the on-holding units 9-2 and 9-3 turn off the switch 14 by turning off the on-output signal Son. Since the transistor 8 is already turned off, the power source of the electronic device body 11 is completely turned off. In the state where the power is turned off, the infrared power supply unit 4 does not consume any power, and the electronic device main body 11 also has no current path from the power source to the ground, so the electronic device 13 does not consume standby power.

  FIG. 3 is a diagram for explaining a third embodiment of the power supply circuit of the electronic device embodying the present invention. FIG. 3A is an example in which the power supply of the electronic device main body 11 is disconnected and connected by the transistor 8. (b) is an example in which the ground of the electronic device body 11 is disconnected and connected by the transistor 8. This third embodiment is effective when a power source only needs to be on during a period in which infrared rays are irradiated, such as a toy infrared radio control, that is, while the device is controlled. In the illustrated third embodiment, the on-holding unit 9-4 is configured by a capacitor 15. By the electromotive force of the photodiode 6 that has received the infrared ray 2 corresponding to power-on, the transistor 8 is turned on and the capacitor 15 is charged, and until the capacitor 15 is discharged in addition to the infrared-light-receiving period corresponding to power-on. During the period, the transistor 8 continues to be turned on with the charging voltage of the capacitor 15, and the power source 10 (FIG. 3A) or the ground G (FIG. 3B) is connected.

  In operation, as in the description of FIG. 1, the infrared ray 2 that is powered on is transmitted from the infrared remote controller 1. As a result, the transistor 8 is turned on, and the capacitor 15 constituting the on-holding unit 9-4 is charged by the power source 10. Since the transistor 8 continues to be turned on until the charged capacitor 15 is discharged, the electronic device 13 is operated by the current flowing from the power supply 10 to the ground.

  When the irradiation of the infrared ray 2 is finished, the electronic device main body 11 to be operated subsequently receives the operation code by the infrared ray 3, and the electronic device 13 operates in accordance with the operation code. In the meantime, as described above, the transistor 8 continues to be turned on by the charged capacitor 15, so that the power source 10 is supplied to the electronic device main body 11.

  When the capacitor 15 is discharged, the transistor 8 is turned off and the power source of the electronic device main body 11 is automatically turned off. In the state where the power is turned off, the infrared power supply unit 4 does not consume any power, and the electronic device main body 11 also has no current path from the power supply 10 to the ground, so the electronic device 13 does not consume standby power.

  The electronic device 13 such as a radio control usually operates with a battery. According to the present invention, since the power source of such an electronic device 13 is turned on only during actual operation, the life of the battery can be extended.

1. Infrared remote control 2. Infrared rays used to power on 3. Infrared rays used to operate electronic devices 4. Infrared power supply section 5. Infrared power on detection unit Photodiode 7. Load resistance 8. Transistors 9-1, 9-2, 9-3, 9-4. ON holding part 10. 10. Power supply for electronic equipment Electronic device body 12. Infrared operation code receiver 13. Electronic device to be operated 14. 15. Switches such as relays Capacitor

Claims (6)

In the power supply circuit of the electronic device that receives the infrared ray for power-on transmitted from the infrared remote controller and connects the power source of the electronic device, and receives the infrared ray for operation to operate the electronic device,
The electronic device is composed of an electronic device main body provided with an operation infrared receiving unit that receives operation infrared light, and an infrared power supply unit provided inside or outside the electronic device main body,
The infrared power-on unit is connected in series between an infrared power-on detection unit that receives power-on infrared rays transmitted from an infrared remote controller, and between the power source and the electronic device body, or the electronic device body and a ground And a transistor that is turned on when the power-on infrared light is received, and an on-holding unit that detects that the transistor is turned on and keeps turning on the transistor when the transistor is turned on. ,
An electronic device comprising: turning on the electronic device main body to be operated by the transistor that is kept on; and operating the electronic device by operating infrared light received by the operating infrared receiving unit after the power is turned on. Equipment power circuit. 2. The power circuit for an electronic device according to claim 1, wherein the infrared power-on detection unit is configured by one or more photodiodes that receive infrared rays transmitted from the infrared remote controller, and load resistors connected in parallel at both ends thereof. 2. The power supply circuit for an electronic device according to claim 1, wherein the power-on infrared is a continuous infrared that keeps a light source on, and the operation infrared is a code signal infrared modulated by a pulse wave. The electronic device body that has received an instruction to turn off the power via the operation infrared ray outputs an off signal to the on-holding unit to stop driving the transistor, thereby turning off the power to the electronic device body. The power supply circuit for an electronic device according to claim 1. Separately from the transistor, a switch for connecting or disconnecting the power supply or ground of the electronic device main body is provided, whereby the switch is connected after the on-holding unit is activated, and the electronic device main body is turned on. The power supply circuit of the electronic device according to claim 1. The on-holding unit is composed of a capacitor, the capacitor is charged by the transistor that is turned on when the power-on infrared light is received, and the capacitor is discharged in addition to the light-receiving infrared light-receiving period. 2. The power supply circuit for an electronic device according to claim 1, wherein the transistor is continuously turned on at a charging voltage of the capacitor during a period.

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