JP2000232615A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device that copes with both a user emphasizing reduction in power consumption and a user emphasizing a clock function by selecting inactivation of the clock function to make the power consumption zero or activation of the clock function though it has some power consumption when a main power switch is turned off. SOLUTION: The main power switch 20 comprises switches 20a, 20b that are turned on/off interlockingly. A sub power switch 21 can supply an AC voltage from an AC power supply 1 to a sub power supply circuit 5 independently of the on/off of the main power switch 20. A control circuit 7 turns on the sub power switch 21 when a clock section 71 is set to an ON state and turns off the sub power switch 21 when the clock section 71 is set to an OFF state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus having a main circuit to which a power supply voltage is supplied from a main power supply circuit, and a clock section to which a power supply voltage is supplied from a sub power supply circuit and which measures time.

[0002]

2. Description of the Related Art In an electronic apparatus such as a television receiver, a main circuit supplied with a power supply voltage from a main power supply circuit and a control circuit (microcomputer) supplied with a power supply voltage from a sub-power supply circuit are used. Have. Normally, when a main power switch, which is a manual switch provided in an electronic device main body, is turned off, the main power supply circuit and the sub power supply circuit do not operate, and do not consume power.

Further, when the standby power key provided on the remote control transmitter is turned off while the main power switch is turned on, the standby switch is turned off and only the main power circuit becomes inoperable. State. In this standby state, although a little power is consumed, the standby switch can be turned on / off by the remote control transmitter, and the operation state and the non-operation state of the electronic device (main circuit) can be selected.

FIG. 8 is a circuit diagram showing a configuration of a general electronic device. In FIG. 8, a main power supply circuit 4 and a sub power supply circuit 5 are connected to a pair of AC lines from the AC power supply 1. One of the AC lines from AC power supply 1
A main power switch 2, which is a mechanical manual switch, is connected. A standby switch (relay) 3 is connected to a line connecting the output stage of the main power switch 2 and the main power circuit 4. The main power supply circuit 4 is for supplying power to a main circuit (not shown). The sub-power supply circuit 5 includes a transformer 51, a rectifying bridge diode 52, and a smoothing capacitor 53, and supplies power to a microcomputer 7 (hereinafter abbreviated as a microcomputer) at a subsequent stage.

In this configuration, when the main power switch 2 is turned off, no AC voltage is supplied to the main power circuit 4 and the sub power circuit 5, so that the main power circuit 4 and the sub power circuit 5 do not operate. In this state, the electronic device is inactive and does not consume power. When the main power switch 2 is turned on, a voltage corresponding to the turn ratio with respect to the primary winding 51a is output to the secondary winding 51b of the transformer 51 of the sub power supply circuit 5. This voltage is rectified and smoothed by the rectifying bridge diode 52 and the smoothing capacitor 53.
The power supply voltage Vcc is supplied. Thereby, the microcomputer 7
Is in the operating state. The microcomputer 7 includes a clock unit 71, and the clock unit 71 measures the time by counting the AC voltage from the transformer 51.

When it is not necessary to operate a main circuit (not shown), for example, a power key for standby provided on the remote control transmitter is turned off, and this signal is input to the microcomputer 7. Then, the microcomputer 7 turns off the switch transistor 8 connected to the standby switch 3 and turns off the standby switch 3 according to the main power control signal from the main power control unit 72. As a result, only the main power supply circuit 4 becomes inactive and enters a standby state. In this standby state, since the microcomputer 7 is operating, the clock function of the clock unit 71 is not affected, and the clock unit 71 keeps measuring time.

[0007]

By the way, in recent years, there has been a demand for reducing the power consumption of electronic devices (electric products) due to an increase in interest in environmental issues and energy saving. In the above-described conventional electronic device, power consumption can be reduced to 0 by turning off the main power switch 2. However, in this case, since no power is supplied to the microcomputer 7, the clock unit 71 does not operate, and the clock function does not operate. That is, the conventional electronic device has a problem that the clock function of the clock unit 71 is cleared when the main power switch 2 is turned off. The user has to reset the clock unit 71 each time the clock function is cleared.

To solve this problem, the microcomputer 7 (clock unit 71) may be configured to always supply power even when the main power switch 2 is turned off. However, in this case, the clock unit 71 operates even when the clock function of the clock unit 71 is not required, and wasteful power is consumed. In the conventional electronic device, when the main power switch 2 is turned off, it is not possible to select whether the clock function is not activated and the power consumption is set to 0 or the power consumption is slightly consumed but the clock function is activated. However, there is a problem that it is impossible to cope with both the user who emphasizes the reduction of the power consumption and the user who emphasizes the clock function.

The present invention has been made in view of such a problem. When the main power switch is turned off, the clock function is not operated and the power consumption is set to 0, or the clock function which consumes the power is operated. It is an object of the present invention to provide an electronic device that can select both a user who places importance on reducing power consumption and a user who places importance on a clock function.

[0010]

According to the present invention, there is provided a power cable (1) for solving the above-mentioned problems of the prior art.
0) and a main power supply circuit (4) and an auxiliary power supply circuit (5) to which an AC voltage is supplied from the AC power supply, and a main power supply circuit operated by the power supply voltage from the main power supply circuit. In an electronic device including a circuit (6), a clock unit (71) operated by a power supply voltage from the sub power supply circuit, and a main power switch (20 or 2) provided in the device main body, the power cable is When the main power switch is turned off and the main power circuit and the main circuit are in an inactive state in a state of being connected to an AC power supply, the sub power circuit and the clock unit are also in an inactive state, and power consumption is zero. And a second state in which the clock unit is operated with only the sub-power supply circuit and the clock unit operating while consuming power. (B) a main power supply circuit (4) and an auxiliary power supply circuit (5) to which an AC voltage from the AC power supply (1) is supplied, and a main circuit (6) operated by the power supply voltage from the main power supply circuit. An electronic device including a clock unit (71) operated by a power supply voltage from the sub-power supply circuit and a main power switch (20 or 2) provided in the device main body; Irrespective of the above, the sub-power switch (21) for supplying an AC voltage from an AC power supply to the sub-power circuit and the sub-power switch when the clock section is turned on, and the clock section being turned off. And (c) receiving an AC voltage from an AC power supply (1). main A power supply circuit (4) and a sub power supply circuit (5); a main circuit (6) operated by a power supply voltage from the main power supply circuit; A circuit (7), a clock section (71) operated by a power supply voltage from the sub-power supply circuit, and a power supply provided in the main body of the apparatus for turning on / off supply of an AC voltage to the main power supply circuit and the sub-power supply circuit. A main power switch (20 or 2); and a standby switch (3) provided between the main power switch and the main power circuit for turning on / off the supply of an AC voltage to the main power circuit. A sub power switch (21) for supplying an AC voltage from an AC power supply to the sub power circuit, irrespective of ON / OFF of the main power switch, the main power switch and the standby switch. By turning on the main circuit, the control circuit, and the clock unit in a first mode, in which the main power switch is turned on and the standby switch is turned off. A second mode in which the main circuit is turned off and the sub-power switch is turned on by turning off the main power switch and turning on the sub-power switch; And a third mode in which the control circuit and the clock section are operated, and the main power switch and the sub power switch are both turned off, so that the main circuit, the control circuit, and the clock section are all inoperative. An electronic device characterized by comprising a selecting means for selecting a fourth mode to be in a state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic device according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of an electronic device of the present invention, FIG. 2 is a circuit diagram showing a first embodiment of the electronic device of the present invention, and FIGS. FIG. 6 is a block diagram showing a second embodiment to a fourth embodiment, FIG. 6 is a block diagram showing an overall configuration of a television receiver as an example of the electronic apparatus of the present invention, and FIG. 7 is a diagram for explaining the operation of the electronic apparatus of the present invention. FIG. In addition, FIG.
6, the same parts as those in FIG. 8 are denoted by the same reference numerals.

First, the overall configuration of a television receiver as an example of the electronic apparatus of the present invention will be described with reference to FIG. In FIG. 6, the television receiver 100 includes:
An AC voltage from the AC power supply 1 is supplied by a power cable 10. An AC voltage from the AC power supply 1 is supplied to the main power supply circuit 4 and the sub power supply circuit 5. The main power supply circuit 4 supplies power to a downstream main circuit 6, and the sub power supply circuit 5 supplies power to a downstream microcomputer (hereinafter abbreviated as a microcomputer) 7. The microcomputer 7 includes a television receiver 10
It is an example of a control circuit that controls each part of the circuit of 0.

The main circuit 6 includes a television circuit 61 and an on-screen synthesizing unit 62, and supplies a video signal to a cathode ray tube (CRT) 11, which is an example of a display unit. The state in which the main circuit 6 is operating is a state in which an image is displayed on the CRT 11. The microcomputer 7 includes a clock unit 71 and an on-screen signal generation unit 73. Clock 71
Is measured by counting the AC voltage from the sub power supply circuit 5. The on-screen signal generator 73 generates an on-screen signal and inputs the signal to the on-screen synthesizer 62 of the main circuit 6.

A remote control signal from a remote control transmitter 200 is input to the microcomputer 7, and each part of the circuit is controlled according to the remote control signal. That is, the microcomputer 7 includes the main circuit 6
When an on-screen display is instructed by the remote control transmitter 200 or by controlling each section of the circuit inside, the on-screen signal from the on-screen signal generation unit 73 is input to the on-screen synthesis unit 62 and displayed on the screen of the CRT 11. Display the on-screen signal.

Although not shown here, the microcomputer 7 supplies the main power from the main power supply circuit 4 to the main circuit 6 by turning on / off a standby power key 201 provided on the remote control transmitter 200. A switch for turning on / off the supply of power is controlled to select an operation state or a non-operation state of the main circuit 6. The state in which the main circuit 6 is inoperative (so-called standby state) is a state in which no image is displayed on the CRT 11. The remote control transmitter 200 is also provided with a clock on / off switching key 202 and a cursor key 203. These operations will be described later.

The detailed configuration of the electronic apparatus of the present invention, which is schematically configured as described above, will be described in order from the first embodiment to the fourth embodiment.

<First Embodiment> Referring to FIG.
The main power switch 20 which is a mechanical manual switch
The main power supply circuit 4 is connected via a power switch (relay) 3 and a standby switch (relay) 3, and the sub power supply circuit 5 is connected via a sub power supply switch (relay) 21. The main power switch 20 is composed of two switches composed of switches 20a and 20b, and these switches 20a and 20b are turned on and off in conjunction with each other. Therefore, this main power switch 20 is apparently similar to one switch, and is not different from the conventional main power switch 2. The AC voltage from the AC power supply 1 is supplied to all of the switches 20 a and 20 b of the main power switch 20 and the standby switch 3. The main power switch 20 is provided on the electronic device main body (the main body of the television receiver 100).

When the main power switch 20 is turned on, an AC voltage from the AC power supply 1 is supplied to the sub power supply circuit 5 via the switch 20b. The electric power generated by the sub power supply circuit 5 is supplied to the control circuit (microcomputer) 7 at the subsequent stage, so that the control circuit 7 is activated. The control circuit 7 includes a clock section 71, and the clock section 71 counts the AC voltage from the sub power supply circuit 5 to count time. In addition,
Here, the clock unit 71 is provided in the control circuit 7, but the control circuit 7 and the clock unit 71 may be provided separately.

When the power key 201 for standby provided on the remote control transmitter 200 shown in FIG. 6 is turned on / off, the standby switch 3 is turned on / off by a main power control signal from the control circuit 7. When the standby switch 3 is turned on, the AC voltage from the AC power supply 1 is supplied to the main power supply circuit 4 via the switch 20a and the standby switch 3. The power generated by the main power supply circuit 4 is supplied to the subsequent main circuit 6, so that the main circuit 6 is in an operating state. Standby switch 3
Is turned off, the AC voltage from the AC power supply 1 is not supplied to the main power supply circuit 4, so that the main circuit 6 is in a non-operating state, and the control circuit 7 is in a standby state in which only the control circuit 7 is in an operating state.

Now, here, the AC power supply 1 and the sub power supply circuit 5
If there is no sub-power switch 21 provided between the control circuit 7 and the main power switch 20, the control circuit 7 is turned off by turning off the main power switch 20, the clock section 71 does not operate, and the clock function does not operate. This is substantially the same as the conventional example described with reference to FIG. However, in the first embodiment of the present invention, an AC voltage from the AC power supply 1 is supplied to the sub power supply circuit 5 in parallel with the switch 20b of the main power supply switch 20 irrespective of ON / OFF of the main power supply switch 20. Sub power switch 2
1 is provided, it is possible to select whether or not to operate the clock unit 71 with the main power switch 20 turned off.

As an example, when a clock on / off switching key 202 provided on the remote control transmitter 200 is pressed, an on-screen signal generator 73 shown in FIG. 6 causes a screen of the CRT 11 to be displayed as shown in FIG. An on-screen signal for selecting whether to operate the clock (“turn on the clock”) or not (“turn off the clock”) is displayed. The on / off state of the timepiece is selected and determined by the left and right keys of the cursor key 203 provided on the remote control transmitter 200 and determined. The selection on the screen whether to operate the clock or not may be performed by a numeric key (not shown), and the determination may be performed by providing a determination key (not shown). The operation may be performed using the left and right keys of the cursor key 203.

When the ON / OFF of the clock section 71 is selected in this way, the control circuit 7 supplies a clock ON / OFF control signal to the sub power switch 21. When the clock 71 is turned on, the control circuit 7 turns on the sub power switch 21. Then, an AC voltage is supplied to the sub power supply circuit 5 even when the main power supply switch 20 is turned off, so that the clock unit 71 (control circuit 7) is activated. Therefore, even if the main power switch 20 is turned off, the clock function of the clock unit 71 is not cleared. As long as the power cable 10 is not disconnected from the AC power supply 1 (so-called AC outlet), the clock 71
Can always work.

On the other hand, when the clock 71 is turned off, the control circuit 7 turns off the sub power switch 21. Then, since the AC voltage is not supplied to the sub power supply circuit 5 when the main power supply switch 20 is turned off, the control circuit 7 is in an inoperative state. Therefore, power consumption can be reduced to zero.

As described above, in the configuration of the first embodiment, when the user turns off the main power switch 20, the clock 71
Can be selected to make the power consumption 0 or to operate the clock unit 71 while consuming power. Both the user who emphasizes the reduction of the power consumption and the user who emphasizes the clock function can be selected. Can be handled.

Here, a specific configuration of the first embodiment shown in FIG. 1 will be described with reference to FIG. In FIG. 2, a main power supply circuit 4 and a sub power supply circuit 5 are connected to a pair of AC lines from the AC power supply 1 via the main power switch 20, the sub power switch 21, and the standby switch 3 described above. I have. Specifically, a line connecting one of the AC lines from the AC power supply 1 and the main power supply circuit 4 is provided with a switch 20a of the main power switch 20 and a standby switch 3 connected in series. A line connecting one of the AC lines from the AC power supply 1 to the sub power supply circuit 5 includes a switch 20b of the main power switch 20 and a sub power switch 2 connected in parallel.
1 is provided.

The sub power supply circuit 5 comprises a transformer 51, a rectifying bridge diode 52, and a smoothing capacitor 53.
Power is supplied to the microcomputer (control circuit) 7 at the subsequent stage. When the main power switch 20 is turned on, a voltage corresponding to the turn ratio with respect to the primary winding 51a is output to the secondary winding 51b of the transformer 51 of the sub power supply circuit 5. This voltage is rectified and smoothed by the rectifying bridge diode 52 and the smoothing capacitor 53, and the microcomputer 7 is supplied with the power supply voltage Vcc. As a result, the microcomputer 7 enters an operating state, and the clock unit 71
Time.

When the power key 201 for standby provided on the remote control transmitter 200 is turned on / off, the microcomputer 7
A main power supply control signal is generated by the main power supply control section 72. The switch transistor 8 connected to the standby switch 3 is turned on / off by the main power control signal, and the standby switch 3 is turned on / off. Thereby, the operation state and the non-operation state of the main power supply circuit 4 can be selected.

As described above, the clock section 7 is operated by the clock on / off switching key 202 provided on the remote control transmitter 200.
When ON / OFF of 1 is selected, the selection result is input to the clock ON / OFF control unit 74. Thereby, the microcomputer 7 generates a clock on / off control signal from the clock on / off control unit 74. The switch transistor 9 connected to the sub power switch 21 is turned on / off by this clock on / off control signal, and the sub power switch 21 is turned on / off. In this manner, the operation state and the non-operation state of the clock unit 71 in the state where the main power switch 20 is turned off can be selected. When the main power switch 20 is turned on, the standby switch 3 may be turned on automatically, or the standby switch 3 may be turned on and off in accordance with the state when the main power switch 20 is turned off. Is also good.

<Second Embodiment> In FIG. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. In the second embodiment, two interlocked switches 20a and 20b
The AC voltage from the AC power supply 1 is supplied to the switch 20a and the standby switch 3 without supplying the AC voltage from the AC power supply 1 to the switch 20b of the main power supply switch 20. The output stage of the switch 20a and the output stage of the standby switch 3 (the input stage of the sub power supply circuit 5) are connected.
The output stage of the auxiliary power supply circuit 5 is connected to the right terminal of the standby switch 3 in the figure, and the left terminal of the standby switch 3 in the figure is connected to the control circuit (microcomputer) 7. Other parts are the same as those in FIG.

In such a configuration, when the main power switch 20 is turned on, the AC voltage from the AC power supply 1 is supplied to the sub power supply circuit 5 via the switch 20a. The electric power generated by the sub power supply circuit 5 is supplied to the control circuit (microcomputer) 7 at the subsequent stage, so that the control circuit 7 is activated. At the same time, the power generated by the sub power supply circuit 5 is input to the control circuit 7 via the switch 20b as a power on detection signal indicating that the main power switch 20 has been turned on.

In the second embodiment, the sub power switch 21 is provided in parallel with the switch 20a of the main power switch 20, so that the AC voltage from the AC power supply 1 can be directly supplied to the sub power supply circuit 5. With the power switch 20 turned off, it is possible to select whether or not to operate the clock unit 71.

As in the first embodiment, turning on / off the clock 71
When OFF is selected, the control circuit 7 supplies a clock ON / OFF control signal to the sub power switch 21. When the clock 71 is turned on, the control circuit 7 turns on the sub power switch 21. Then, an AC voltage is supplied to the sub power supply circuit 5 even when the main power supply switch 20 is turned off, so that the clock unit 71 (control circuit 7) is activated. Therefore, even if the main power switch 20 is turned off, the clock function of the clock unit 71 is not cleared. As long as the power supply cable 10 is not disconnected from the AC power supply 1, the clock unit 71 can be operated at all times.

On the other hand, when the clock 71 is turned off, the control circuit 7 turns off the sub power switch 21. Then, since the AC voltage is not supplied to the sub power supply circuit 5 when the main power supply switch 20 is turned off, the control circuit 7 is in an inoperative state. Therefore, power consumption can be reduced to zero.

As described above, also in the configuration of the second embodiment, when the user turns off the main power switch 20, the clock 71
Can be selected to make the power consumption 0 or to operate the clock unit 71 while consuming power. Both the user who emphasizes the reduction of the power consumption and the user who emphasizes the clock function can be selected. Can be handled. In addition,
When the main power switch 20 is turned on, the standby switch 3
May be automatically turned on, or the standby switch 3 may be turned on and off in accordance with the state when the main power switch 20 is turned off.

<Third Embodiment> In FIG. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted. In the third embodiment, instead of the sub power switch 21 which is a relay,
The photocoupler 22 is used. The on / off of the photocoupler 22 is switched by a clock on / off control signal from the control circuit 7. Thus, when the main power switch 20 is turned off, the clock unit 71 is made inoperative to reduce the power consumption to 0, or the clock unit 71 that consumes power.
Can be selected.

The first to third embodiments described above are characterized in that the main power switch 20 including the switches 20a and 20b which are turned on / off in conjunction with each other is used. When the main power switch 20 is turned on, the AC voltage from the AC power supply 1 can be supplied to the subsequent main power supply circuit 4 via the switch 20a. Whether the AC voltage is actually supplied to the main power supply circuit 4 is selected by turning on / off the standby switch 3.

When the main power switch 20 is turned on,
The AC voltage from the AC power supply 1 supplies the AC voltage to the subsequent sub-power supply circuit 5 via the switch 20b or 20a. Therefore, the power supply voltage from the sub power supply circuit 5 is supplied to the control circuit 7, and the control circuit 7 enters an operating state. Since the sub power supply switch 21 is provided between the AC power supply 1 and the sub power supply circuit 5 so that an AC voltage can be supplied to the sub power supply circuit 5 irrespective of whether the main power supply switch 20 is turned on or off. 5 and the control circuit 7 (clock section 71) are also inoperative and the first state in which the power consumption is 0, and the power is consumed but the sub power supply circuit 5 and the control circuit 7 (clock section 71) are in the operating state and the clock is The second state in which the unit 71 is operated can be freely selected.

<Fourth Embodiment> In FIG. 5, the same parts as those in FIGS. 1 to 4 and 8 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. In the fourth embodiment, the main power switch 2 conventionally used is used instead of the main power switch 20.
The main power switch 2 and the sub power switch 21 are connected in parallel, and an AC voltage from the AC power supply 1 is supplied to the main power switch 2 and the sub power switch 21. A diode 23 is connected between the output stage of the main power switch 2 and the output stage of the sub power switch 21 (the input stage of the sub power circuit 5) with the polarity shown.

In this configuration, when the main power switch 2 is turned on, the AC voltage from the AC power supply 1 is supplied to the sub power supply circuit 5 via the diode 23. The electric power generated by the sub power supply circuit 5 is supplied to the control circuit (microcomputer) 7 at the subsequent stage, so that the control circuit 7 is activated. Also in the fourth embodiment, the sub power switch 21 is provided in parallel with the main power switch 2 so that the AC voltage from the AC power source 1 can be directly supplied to the sub power circuit 5, so that the main power switch 2 is turned off. In this state, whether or not to operate the clock unit 71 can be selected.

As in the first embodiment, turning on / off the clock 71
When OFF is selected, the control circuit 7 supplies a clock ON / OFF control signal to the sub power switch 21. When the clock 71 is turned on, the control circuit 7 turns on the sub power switch 21. Then, an AC voltage is supplied to the sub power supply circuit 5 even when the main power supply switch 20 is turned off, so that the clock unit 71 (control circuit 7) is activated. Therefore, even if the main power switch 20 is turned off, the clock function of the clock unit 71 is not cleared. As long as the power supply cable 10 is not disconnected from the AC power supply 1, the clock unit 71 can be operated at all times. Even if the sub power switch 21 is turned on by the diode 23, the main power circuit 4 does not operate.

On the other hand, when the clock 71 is turned off, the control circuit 7 turns off the sub power switch 21. Then, since the AC voltage is not supplied to the sub power supply circuit 5 when the main power supply switch 2 is turned off, the control circuit 7 is in an inoperative state. Therefore, power consumption can be reduced to zero.

As described above, also in the configuration of the fourth embodiment, when the main power switch 2 is turned off, the user disables the clock unit 71 to reduce the power consumption to 0, or the clock consuming power. It is possible to select whether to operate the unit 71, and it is possible to cope with both the user who emphasizes the reduction of power consumption and the user who emphasizes the clock function. In addition,
When the main power switch 2 is turned on, the standby switch 3 may be turned on automatically, or the standby switch 3 may be turned on and off according to the state when the main power switch 2 is turned off. .

As can be understood from the above description, in the electronic apparatus of the present invention, the main circuit 4, the control circuit 7, and the clock 71 are turned on by turning on both the main power switch 20 (or 2) and the standby switch 3. The first to make all operational
In the second mode, the main power switch 20 (or 2) is turned on and the standby switch 3 is turned off, so that the main circuit 4 is inoperative and the control circuit 7 and the clock 71 are in operation. Mode, main power switch 20
By turning off (or 2) and turning on the sub power switch 21, the third mode in which the main circuit 4 is inoperative and the control circuit 7 and the clock 71 are in operation, the main power switch 20 ( Alternatively, by turning off both 2) and the sub-power switch 21, it is possible to select four modes including the fourth mode in which the main circuit 4, the control circuit 71, and the clock unit 71 are all in the inoperative state.

In these modes, the main power switch 20
(Or 2) on / off and remote control transmitter 200
Of the power key 201 and the clock on / off switching key 202. The main power switch 20 (or 2), the power key 201, the clock on / off switching key 202, the standby switch 3, the sub power switch 21, and the control circuit 7 are selection means for selecting the above four modes. .

The present invention is not limited to the embodiment described above, and can be variously modified without departing from the present invention.

[0046]

As described above in detail, the electronic device of the present invention supplies an AC voltage from an AC power supply to a sub-power supply circuit irrespective of ON / OFF of a main power switch provided in the device main body. Power supply by controlling the sub-power switch to turn on the sub-power switch when the clock section is set to on, and turning off the sub-power switch when the clock section is set to off. When the main power switch is turned off and the main power circuit and the main circuit are inactive in a state where the cable is connected to the AC power supply, the sub power circuit and the clock unit are also inoperative and the power consumption is set to 0. 1 and a second state in which the clock section is operated with only the sub-power supply circuit and the clock section operating while consuming power, so that when the main power switch is turned off, Or the power consumption without exercising function and 0, or exert clock function that consumes power can be selected by the user. Therefore, it is possible to cope with both the user who emphasizes the reduction of the power consumption and the user who emphasizes the clock function.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a first embodiment of the present invention.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

FIG. 5 is a block diagram showing a fourth embodiment of the present invention.

FIG. 6 is a block diagram illustrating an overall configuration of a television receiver as an example of the present invention.

FIG. 7 is a diagram for explaining the operation of the electronic device of the present invention.

FIG. 8 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2, 20 Main power switch 3 Standby switch 4 Main power circuit 5 Sub power circuit 6 Main circuit 7 Control circuit (microcomputer) 10 Power cable 21 Sub power switch 71 Clock section

Claims (4)

[Claims] A main power supply circuit and a sub power supply circuit connected to an AC power supply by a power supply cable and supplied with an AC voltage from the AC power supply; a main circuit operated by a power supply voltage from the main power supply circuit; In an electronic device including a clock unit that operates by a power supply voltage from a sub power supply circuit and a main power switch provided in a device main body, the main power switch is turned off while the power cable is connected to an AC power supply. Then, when the main power supply circuit and the main circuit are in an inactive state, the sub power supply circuit and the clock section are also in an inactive state, and a first state in which the power consumption is 0; An electronic apparatus, wherein a power supply circuit and a second state in which the clock section is operated are made selectable by setting only the power supply circuit and the clock section in an operation state. 2. A main power supply circuit and an auxiliary power supply circuit to which an AC voltage is supplied from an AC power supply, a main circuit operated by a power supply voltage from the main power supply circuit, and an operation by a power supply voltage from the auxiliary power supply circuit. An electronic device comprising a clock unit and a main power switch provided in a device main body, wherein a sub-power supply for supplying an AC voltage from an AC power supply to the sub-power circuit irrespective of ON / OFF of the main power switch A switch, and a control circuit configured to control to turn on the sub power switch when the clock section is set to on and to turn off the sub power switch when the clock section is set to off. And electronic equipment. 3. A main power supply circuit and a sub power supply circuit to which an AC voltage is supplied from an AC power supply, a main circuit operated by a power supply voltage from the main power supply circuit, and a main circuit operated by a power supply voltage from the sub power supply circuit. A control circuit for controlling each circuit unit, a clock unit that operates on the power supply voltage from the sub-power supply circuit, and a power supply unit that is provided in the device main body and turns on and off the supply of an AC voltage to the main power supply circuit and the sub-power supply circuit. An electronic device, comprising: a main power switch that switches on and off; and a standby switch that is provided between the main power switch and the main power circuit and that turns on and off the supply of an AC voltage to the main power circuit. Regardless of whether the power switch is on or off, a sub power switch that supplies an AC voltage from an AC power supply to the sub power circuit, and the main power switch and the standby switch are both turned on. A first mode in which the main circuit, the control circuit, and the clock section are all in the operating state, and the main circuit is turned off and the standby switch is turned off, whereby the main circuit is brought into a non-operating state. A second mode in which the control circuit and the clock section are in an operating state, and the main circuit is inactivated by turning off the main power switch and turning on the sub power switch, and A third mode in which the circuit and the clock section are in the operating state, and the main power switch, the control circuit, and the clock section are all inoperative by turning off both the main power switch and the sub power switch. An electronic device comprising: a selection unit for selecting a fourth mode. 4. The main power switch is a mechanical manual switch in which first and second switches are turned on / off in conjunction with each other. When the main power switch is turned on, the first and second main power switches are turned on and off. 4. The electronic device according to claim 1, wherein an AC voltage is supplied to the sub-power supply circuit by any one of switches.