JP3387546B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device which prevents malfunctions of electronic components due to a voltage drop of a power supply when driving an electric element.

[0002]

2. Description of the Related Art In the prior art, for example, Japanese Patent Publication No. 58-9 / 1983
No. 391, a power supply for driving a light emitting element and a power supply for driving a clock are the same, or a power supply dedicated to clock driving as described in Japanese Patent Application Laid-Open No. 54-122164. There has been known a configuration in which a power supply is completely separated from a power supply dedicated to a light emitting element.

[0003]

However, when the power supply for driving the light emitting element and the power supply for driving the timepiece of the conventional configuration are the same, a voltage drop of the power supply occurs when the light emitting element is driven, causing a malfunction of the timepiece. There was a problem that.

Another problem is that if the power supply of the timepiece is completely separated from the light emitting element of another conventional configuration, the power supply cannot be used mutually.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a power supply for driving an electronic component is a first power supply when an electric element is not driven. In the driving state of the electric element, the power supply for driving the electric element was the first power supply, and the power supply for driving the electronic components was the second power supply. With the configuration in which it is known that the electric element is driven to cause a voltage drop, the power supply to the electronic component is changed to the second power even if the first power supply, which is the power supply to the electronic component, causes a voltage drop.
By switching to the power supply, malfunction of electronic components can be prevented. In addition, since the first and second power supplies can be used for the electronic components, efficiency can be improved by mutual use of the power supplies.

[0006]

In FIG. 1, when the switch 100 changes to the ON state, the switch operation control circuit 101 operates the electric element driving circuit 105 by the output to the electric element driving circuit 105 to drive the electric element 106. In addition, the switch operation control circuit 101 operates the power supply selection circuit 103 based on the output to the power supply selection circuit 103 and switches the power supply to the electronic component 107 from the first power supply 104 to the second power supply 102.

That is, the drive state and the non-drive state of the electric element 106 are selected by operating the switch 100, and when the electric element 106 is not driven, the power supplied to the electronic component 107 using the power supply selection circuit 103 is The first power supply 104 is selected and used. When the electric element 106 is driven, the power supply to the electronic component 107 using the power supply selection circuit 103 selects and uses the second power supply 104.

In FIG. 2, when the electric element driving circuit 204 is operated by the signal from the electronic component 206 to drive the electric element 205, the first power supply 203 causes a voltage drop. When the voltage of the first power supply 203 decreases as detected by the power supply detection circuit 200, the power supply selection circuit 202 is operated by the output to the power supply selection circuit 202 to supply the power supply to the electronic component 206 from the first power supply 203 to the first power supply 203. 2 is switched to the power supply 201.

That is, the first power supply 2
When the voltage of the first power supply 203 is detected and the voltage of the first power supply 203 decreases, the power supply to the electronic component 206 is switched from the first power supply 203 to the second power supply 20 using the power supply selection circuit 202.
Switch to 1 for use.

In FIG. 3, an electric component driving circuit 303 is operated by a signal from an electronic component 305 to drive an electric element 304, and at the same time, a signal is output to a power supply selection circuit 301 to operate the power supply selection circuit 301 to operate the electronic component. The power supplied to the power supply 305 is switched from the first power supply 302 to the second power supply 300.

That is, the driving or non-driving of the electric element 304 is selected using the signal from the electronic component 305. When the electric element 304 is not driven, the first power supply 302 is selected as the power supply to the electronic component 305. When the electric element 304 is driven, the second power supply 300 is supplied to the electronic component 305. Select and use.

In FIG. 4, a counting circuit 401 counts periodic signals from a signal generation circuit 400. In the comparison circuit 403, the data of the counting circuit 401 and the condition storage circuit 402
And outputs a signal to the electric element drive circuit 407 and the power supply selection circuit 405 if the comparison result is the same. The electric element driving circuit 407 is operated by the output signal to the electric element driving circuit 407 to drive the electric element 408. Also,
The output signal to the power supply selection circuit 405
Is operated to switch the power supplied to the electronic component 409 from the first power 406 to the second power 404.

That is, the driving or non-driving of the electric element 408 can be selected according to the result of the comparison circuit 403. Then, the power supply selection circuit 405 is used to
8 is not driven, the power supplied to the electronic component 409 is the first
Power source 406 is selected. When the electric element 408 is driven, the power supplied to the electronic component 409 is the second power.
Is selected and used.

In FIG. 5, a sensor output control circuit 501 operates an electric element drive circuit 505 to drive an electric element 506 in accordance with an output of a sensor 500, and operates a power supply selection circuit 503 in response to an output to a power supply selection circuit 503. The power supplied to the electronic component 507 is switched from the first power 504 to the second power 502.

That is, the driving or non-driving of the electric element 506 can be selected according to the output condition of the sensor 500. In the power supply selection circuit 503, when the electric element 506 is driven, the first power supply 504 is selected and used as the power supply to the electronic component 507. When the electric element 506 is driven, the power supplied to the electronic component 507 is the second power supply 50.
Select and use 4.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an electronic apparatus according to the present invention.

(1) First Embodiment FIG. 6 is a block diagram of a first embodiment of an electronic apparatus according to the present invention. When the switch 600 is off, the electroluminescence driving circuit 605 is stopped by the output from the switch operation control circuit 601 to deactivate the electroluminescence 606, and at the same time, a signal is output from the switch operation control circuit 601 to the power supply selection circuit 603. The power supplied to the clock circuit 607 and the liquid crystal panel 608 is
04.

When the switch 600 is on, the switch operation control circuit 601 operates the electroluminescence driving circuit 605 to cause the electroluminescence 60 to operate.
6 is driven. Since the battery 604 is used for driving the electroluminescence 606, the battery 604 causes a voltage drop. Since the clock circuit 607 must malfunction due to the voltage drop of the battery 604, a signal is output from the switch operation control circuit 601 to the power supply selection circuit 603 when the electroluminescence 606 is driven, and the clock circuit 607 and the liquid crystal panel 608 are output. Power supply to the battery 60
4 to the capacitor 602.

When the electroluminescence 606 is not driven by the operation of the switch 600, a signal is output from the switch operation control circuit 601 to the power supply selection circuit 603 to supply the power supply to the clock circuit 607 and the liquid crystal panel 608 to the capacitor 602. To battery 604.

Here, a representative example of the power supply selection circuit 603 will be described with reference to FIGS.

[0021] Here, as shown in the representative examples which use the P-channel insulated gate field effect transistor as a switch to select the power supply can be replaced any time what if those capable of performing switching.

FIG. 12 shows that the first signal 1201 corresponds to the first P-channel insulated gate field effect transistor 1101. A second signal 1202 corresponds to the second P-channel insulated gate field effect transistor 1103. It is a timing chart in which the third signal 1203 corresponds to the third P-channel insulated gate field effect transistor 1106.

When the electric element driving circuit 1107 is not driven, the first P-channel insulated gate field effect transistor 1101 is off, the second P-channel insulated gate field effect transistor 1103 is on, and the third P-channel insulated gate field effect transistor 1103 is on. Gate type field effect transistor 11
Switch operation control circuit 11 so that switch 06 is turned off.
04 outputs a signal. When the first P-channel insulated gate field effect transistor 1101 is off,
Channel insulated gate field effect transistor 1103
Is turned on and the third P-channel insulated gate field effect transistor 1106 is turned off.
The power supplied to the battery 100 is the first battery 1105.

When the electric element driving circuit 1107 is changed from the non-driving state to the driving state, first, as shown in the timing chart 1210 of the transition from the non-driving state to the driving state, the first P
Channel insulated gate field effect transistor 1101
From off to on. Next, at least when the first P-channel insulated gate field effect transistor 1101 is turned on from off, or after the first P-channel insulated gate field effect transistor 1101 is turned on from off, The effect transistor 1103 is turned off from on. Next, at least when the second P-channel insulated gate field effect transistor 1103 is turned off from on, or after the second P-channel insulated gate field effect transistor 1103 is turned off from on, the third P-channel insulated gate field effect transistor is turned off. A signal is output from the switch operation control circuit 1104 so that the effect transistor 1106 is turned on from off. By doing so, it is possible to prevent a malfunction that occurs when all the power supplied to the electronic component 1100 is released.

When the electric element driving circuit 1107 is in a driving state, the first P-channel insulated gate field effect transistor 1101 is on, the second P-channel insulated gate field effect transistor 1103 is off, and the third P-channel insulated gate field effect transistor 1103 is off.
P-channel insulated gate field effect transistor 110
6 so that the switch operation control circuit 110 is turned on.
4 outputs a signal. When the first P-channel insulated-gate field-effect transistor 1101 is on, the second P-channel insulated-gate field-effect transistor 1103 is off, and the third P-channel insulated-gate field-effect transistor 1106 is on, the electronic component 11
The power supplied to 00 is the second battery 1102 . The power supplied to the electronic element driving circuit 1107 is the first battery 1105 .

When the electric element driving circuit 1107 is changed from the driving state to the non-driving state, first, as shown in the timing chart 1220 for transition from the driving state to the non-driving state, the third P
Channel insulated gate field effect transistor 1106
From ON to OFF. Next, at least at the same time as at least the third P-channel insulated gate field effect transistor 1106 is turned off from on or after the third P-channel insulated gate field effect transistor 1106 is turned on from off, The field effect transistor 1103 is turned on from off. Next, the 1 P-channel insulated gate after either simultaneously or the 2P channel insulated gate field effect transistor 1103 when the ON state from the OFF at least the 2P channel insulated gate field effect transistor 1103 is shifted to the ON state from the OFF Field effect transistor
A signal is output from the switch operation control circuit 1104 so that the switch 1101 is turned off from on. By doing so, it is possible to prevent a malfunction that occurs when all the power supplied to the electronic component 1100 is released.

Here, a typical example using the present invention will be described with reference to FIG. FIG. 13 is an external view of a digital timepiece using the present invention. The display device 1300 is a liquid crystal display device using electroluminescence as a backlight. When the switch 1301 is pressed, the electroluminescence is turned on and the display can be clearly seen even in a dark place.

(2) Second Embodiment FIG. 7 is a block diagram of a second embodiment of the electronic apparatus of the present invention. The buzzer drive circuit 7 is activated by the alarm function of the clock circuit 706.
When the buzzer 705 is sounded by operating the 04, the battery 703 is used for driving the buzzer.

Then, the voltage of the battery 703 is detected by the voltage detection circuit 700, and when the voltage drops, the power supply to the clock circuit 706 and the motor 707 is switched from the battery 703 to the capacitor 701 by the power supply selection circuit 702. The malfunction of the clock circuit 706 and the motor 707 is prevented from the voltage drop.

(3) Third Embodiment FIG. 8 is a block diagram of a third embodiment of the electronic apparatus of the present invention. The clock circuit 806 is an analog clock that displays the time by driving the motor 807. When the buzzer 805 is driven by operating the buzzer drive circuit by the sounding function of the clock circuit 806 , the battery 803 causes a voltage drop. The clock circuit 806 and the motor 807 cannot be driven by the battery 803 having the voltage drop.

Therefore, the rotation of the motor 807 is detected by the motor rotation detection circuit 800. When the motor 807 is not rotating normally, the clock circuit 806 and the motor 8 are driven by the power source selection circuit 802.
07 is switched from the battery 803 to the secondary battery 801 so that the battery 80 driven by the buzzer 805 can be operated.
3 prevents malfunction of the clock circuit 806 and the motor 807 due to the voltage drop of 3.

(4) Fourth Embodiment FIG. 9 is a block diagram showing a fourth embodiment of the electronic apparatus of the present invention. The signal is generated by the signal generation circuit 900 and counted by the counter 901. The value is stored in the condition storage circuit 902 in advance, and the value is compared with the value of the counter 901 by the comparison circuit 903. Based on the comparison result, the buzzer driving circuit 907 is operated using the output from the comparing circuit 903 as an input to the buzzer driving circuit 907 to drive the buzzer 908. When the buzzer 908 is driven, the battery 906 causes a voltage drop.

Therefore, when the output from the comparison circuit 903 is input to the power supply selection circuit 905 and the buzzer is driven, the clock circuit 909 and the power supply to the liquid crystal panel 910 are used as the capacitor 904, and when the buzzer is not driven, the clock circuit is used. 9
09 and the battery 906 as the power supply to the liquid crystal panel 910, the clock circuit 909
And the liquid crystal panel 910 is prevented from malfunctioning.

(5) Fifth Embodiment FIG. 10 is a block diagram of a fifth embodiment of the electronic apparatus of the present invention. The brightness around the electronic device is sensed by the optical sensor 1000 and output to the sensor output control circuit 1001. When the surroundings become dark, the sensor output control circuit 1001 operates the electroluminescence driving circuit 1005 to drive the electroluminescence 1006. When the electroluminescence 1006 is driven, the battery 10
04 causes a voltage drop. Battery 10 with voltage drop
In 04, the clock circuit 1007 and the motor 1008 cannot be driven.

Therefore, the power supply selection circuit 1003, which receives the output of the sensor output control circuit 1001 as an input, operates the clock circuit 1007 and the motor 100 during electroluminescence driving.
As power supply the secondary battery 1002 and supplies the 8, by the power of electroluminescent undriven supplies the clock circuit 1007 and motor 1008 switches as a battery 1004, a clock circuit due to the voltage drop of the battery 1004 by electroluminescence 1006 drive 1007
And malfunction of the motor 1008 is prevented.

[0036]

As described above, according to the present invention, the use of the configuration in which the period during which the electric element is being driven is known and the use of the power supply selection circuit make it possible for the electronic component to malfunction due to the voltage drop that occurs when the electric element is driven. And the use of two power supplies, so that a power supply using another power supply can be effectively used only while the electric element is being driven.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a typical example of a configuration of an electronic device according to the invention.

FIG. 2 is a block diagram illustrating a typical example of a configuration of an electronic device according to the invention.

FIG. 3 is a block diagram illustrating a typical example of a configuration of an electronic device according to the invention.

FIG. 4 is a block diagram illustrating a typical example of a configuration of an electronic apparatus according to the invention.

FIG. 5 is a block diagram illustrating a typical example of a configuration of an electronic apparatus according to the invention.

FIG. 6 is a block diagram showing a first embodiment of the electronic apparatus of the present invention.

FIG. 7 is a block diagram showing a second embodiment of the electronic apparatus of the present invention.

FIG. 8 is a block diagram showing a third embodiment of the electronic apparatus of the present invention.

FIG. 9 is a block diagram showing a fourth embodiment of the electronic apparatus of the present invention.

FIG. 10 is a block diagram showing a fifth embodiment of the electronic apparatus of the present invention.

FIG. 11 shows a typical power supply selection circuit of the electronic apparatus of the present invention.

FIG. 12 is a timing chart of a typical power supply selection circuit of the electronic apparatus of the present invention.

FIG. 13 is an external view of a typical embodiment using the electronic device of the present invention.

[Explanation of symbols]

100 switch 101 Switch operation control circuit 102 Second power supply 103 Power supply selection circuit 104 First power supply 105 Electric element drive circuit 106 electric element 107 Electronic components 200 Voltage detection circuit 201 Second power supply 202 Power supply selection circuit 203 First power supply 204 Electric element drive circuit 205 electrical element 206 Electronic components 300 Second power supply 301 Power supply selection circuit 302 First power supply 303 Electric element drive circuit 304 electrical element 305 Electronic components 400 signal generation circuit 401 counting circuit 402 Condition storage circuit 403 Comparison circuit 404 2 power supply 405 Power supply selection circuit 406 first power supply 407 Electric element drive circuit 408 electrical element 409 Electronic components 500 sensors 501 Sensor operation control circuit 502 Second power supply 503 Power supply selection circuit 504 first power supply 505 Electric element drive circuit 506 electrical element 507 Electronic components

Claims (2)

(57) [Claims] 1. A signal generating circuit (400) for generating a periodic signal, a counting circuit (401) for counting signals by using an output of the signal generating circuit (400) as an input, and the counting circuit (401). A condition storage circuit (402) for storing a predetermined value for comparison with the value of
1) a comparison circuit (403) for comparing the condition storage circuit (402) with the first power supply (40) connected to the electric element drive circuit (407) and the power supply selection circuit (405).
6), a second power supply (404) connected to the power supply selection circuit (405), and the electric element drive circuit (404) that drives an electric element (408) using the output of the comparison circuit (403) as an input. 407) and the electric element drive circuit (40
7) driving the electric element (408) and the power supply to the electronic component (409) by the electric element (408).
The power supply selection circuit (40) selects the second power supply (404) when the power supply is driven, and selects the first power supply (406) when the electric element (408) is not driven.
5) and an electronic component (409) that receives power supply from the power supply selection circuit (405). 2. A sensor (500) and said sensor (50).
0) as an input.
1), a first power supply (504) connected to the electric element drive circuit (505) and the power supply selection circuit (503), and a second power supply (502) connected to the power supply selection circuit (503). ), The output of the sensor operation control circuit (501), the electric element driving circuit (505) for driving the electric element (506), and the power supply to the electronic component (507). The second power supply (502) is selected when the electric element (506) is driven, and the first power supply (504) is selected when the electric element (506) is not driven.
And the electronic component (5) receiving power supply from the power supply selection circuit (503).
07).