JPH06337946A - Battery power supply type electronic equipment - Google Patents

Abstract

PURPOSE:To provide a battery power supply type electronic equipment capable of reducing the power consumption of a microcomputer and preventing the microcomputer from being deteriorated by inputting an operation start command signal or a signal corresponding to the electromotive voltage of a battery while interlocking with the ON operation of an operation switch to the microcomputer using the battery as a power supply. CONSTITUTION:A feeding route 6 from the battery 2 to the microcomputer 1 is connected/interrupted by a switching circuit 12 while interlocking with the ON/OFF of an operation switch 3 and an operation start command signal VR1 and a battery voltage signal VX respectively generated by an operation start command circuit 11 and a battery voltage signal circuit 21 interlocking with the ON operation of the switch 3 are inputted to the microcomputer 1 through respective delay circuits 16, 22. The input timing of the signals VR1, VX to the microcomputer 1 is delayed from feeding timing to the microcomputer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-powered electronic device having a microcomputer.

[0002]

2. Description of the Related Art It is generally known that an electronic device having a microcomputer is mounted on a device, and various kinds of control of the device are performed by the electronic device. The temperature and the combustion state of the combustion section are detected using a thermistor or thermoelectric conversion element, and the detection signal is input to a microcomputer installed in the device, and the microcomputer supplies a fuel to the combustion section according to a predetermined program. It is generally known that the combustion in the combustion section is controlled via a solenoid valve or the like provided in the passage.

Electronic devices of this type include those that use a commercial power source as a power source and those that use a battery. Those using a commercial power source operate in a microcomputer after the electronic device is connected to the commercial power source. Power is always supplied to start the power supply, and when the operation switch provided in the device is turned on, an operation start command signal is given to the microcomputer in conjunction with this, and thereby various microcomputers perform various operations. I'm trying to start the control.

Further, in the case of using a battery, conventionally, it is necessary to give an operation start command signal interlocked with an ON operation of an operation switch to the microcomputer while the microcomputer is on standby, so that it is commercialized. Similar to the case of the power source, the power source for operating the microcomputer is always supplied from the battery.

However, especially in electronic equipment using a battery as a power source, conventionally, since the operating power source for the microcomputer is always supplied from the battery as described above, the energy of the battery is kept even when the operation of the apparatus is stopped. There is an inconvenience that the life of the battery is shortened by being consumed by the microcomputer.

In order to eliminate such inconvenience, for example, as in the case of the operation start command signal, the operating power supply is supplied from the battery to the microcomputer in conjunction with the ON operation of the operation switch, and the microcomputer is operated only when the apparatus is in operation. It is conceivable to start the computer and thereby reduce the battery consumption by the microcomputer. In this case, however, due to the response accuracy of electronic components, etc., the microcomputer is required to start the operation start command signal rather than its operating power supply. In many cases, there is a situation in which is given first. If the operation start command signal or the like is given to the microcomputer in advance of the operation power source, the microcomputer is likely to deteriorate, and the control operation of the microcomputer is uncertain. It is easy to become a thing.

Further, in an electronic device using a battery as a power source, a microcomputer monitors the electromotive voltage of the battery and, for example, when the electromotive voltage of the battery drops below a predetermined value,
It is known that the microcomputer is informed to the user through a notification means such as a lamp, and in this type, the electromotive voltage of the battery is linked to the ON operation of the operation switch. The corresponding voltage signal is input to the microcomputer.

However, in the electronic equipment for monitoring the electromotive voltage of the battery by the microcomputer as described above, in order to reduce the consumption of the battery by the microcomputer as described above, the microcomputer operates in accordance with the ON operation of the operation switch. When the operating power is supplied to the computer, a voltage signal corresponding to the electromotive voltage of the battery is often given to the microcomputer before the operating power is supplied. As in the case described above, there is the inconvenience that the microcomputer easily deteriorates.

[0009]

In view of such a background, the present invention is provided with a microcomputer powered by a battery,
In a battery-powered electronic device that inputs an operation start command signal or a signal corresponding to the electromotive voltage of a battery to the microcomputer in conjunction with the ON operation of the operation switch, it is possible to reduce the power consumption of the microcomputer and An object is to provide a battery-powered electronic device that can prevent deterioration of a computer.

[0010]

In order to achieve the above object, a first aspect of the present invention is directed to a microcomputer for controlling the operation of an electronic device using a battery as a power source, and an ON operation of an operation switch of the electronic device. In a battery-powered electronic device having an operation start command circuit that generates and outputs an operation start command signal to the microcomputer in conjunction with
The power supply path from the battery to the microcomputer is linked with the ON / OFF operation of the operation switch to conduct electricity.
A switching circuit for shutting off and an operation command signal delay circuit for inputting an operation start command signal of the operation start command circuit to the microcomputer at a timing later than the timing of conduction of the power feeding path by the switching circuit. Characterize.

In order to achieve the above-mentioned object, the second aspect of the present invention operates in conjunction with a microcomputer for controlling the operation of electronic equipment using a battery as a power source and an ON operation of an operation switch of the electronic equipment. The microcomputer is provided with a battery voltage signal circuit that generates and outputs a battery voltage signal corresponding to the electromotive voltage of the battery, and the microcomputer outputs the electromotive voltage of the battery based on the battery voltage signal of the battery voltage signal circuit. In a battery-powered electronic device having a battery voltage monitoring means for monitoring, a power supply path from the battery to the microcomputer is turned on / off by the operation switch.
A switching circuit that conducts / shuts off in conjunction with FF operation, and a battery voltage signal delay that causes the battery voltage signal of the battery voltage signal circuit to be input to the microcomputer at a timing later than the timing of conduction of the power supply path by the switching circuit. And a circuit.

[0012]

According to the first aspect of the present invention, when the operation switch is turned on, the power supply path from the battery to the microcomputer is brought into conduction by the switching circuit, and accordingly, the microcomputer is connected to the power supply path. Operating power is supplied from the battery to start the microcomputer. Then, at this time, the operation start command signal generated and output by the operation start command circuit in conjunction with the ON operation of the operation switch is after the conduction of the power supply path from the battery to the microcomputer, that is, After the microcomputer is activated, the signal is input to the microcomputer via the operation command signal delay circuit, thereby preventing the deterioration of the microcomputer. When the operation switch is turned off, the power supply path from the battery to the microcomputer is cut off by the switching circuit, and the power supply from the battery to the microcomputer is stopped. Therefore, the power supply from the battery to the microcomputer for operating power is performed only when the electronic device is operating,
This reduces the power consumption of the microcomputer.

Next, according to the second aspect of the present invention, similarly to the first aspect, the switching circuit supplies power from the battery to the microcomputer only when the electronic device is in operation. As a result, the power consumption of the microcomputer is reduced. Then, when the operation switch is turned on, the battery voltage signal generated and output by the battery voltage signal circuit is output via the battery voltage signal delay circuit after the microcomputer is activated in conjunction with the operation switch turned on. Input to the microcomputer, which prevents the deterioration of the microcomputer.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described with reference to FIG. FIG. 1 is an explanatory configuration diagram of a battery-powered electronic device of this embodiment.

In FIG. 1, the battery-powered electronic device of this embodiment is, for example, an electronic device in a gas stove, in which 1 is a microcomputer (hereinafter simply referred to as a microcomputer) and 2 is a battery as a power source for the microcomputer 1 and the like. Reference numeral 3 denotes an operation switch for starting or stopping the operation of the gas stove of this embodiment, 4 a burner, and 5 a gas supply path for supplying gas to the burner 4. The battery 2 is, for example, four dry batteries having a rated voltage of 1.5 V connected in series.

A power supply path 6 from the battery 2 to the power supply terminal a of the microcomputer 1 receives the electromotive voltage VD of the battery 2 (hereinafter referred to as battery voltage VD) as a constant voltage VR (for example, 3.2).
V, hereinafter referred to as regulator voltage VR) and a switching transistor 8 (PNP)
, And the emitter and collector of the switching transistor 8 are respectively connected to the output point A of the regulator 7.
And a power supply terminal a of the microcomputer 1. Also,
The operation switch 3 is connected to the output point A of the regulator 7 via the resistor 9, and the subsequent stage of the operation switch 3 is
It is connected to the base of the switching transistor 10 (NPN type). The emitter of the switching transistor 10 is grounded, and the collector is connected to the base of the switching transistor 8.

According to the structure of the present invention, the resistor 9 and the operation switch 3 form an operation start command circuit 11 for generating an operation start command signal to the microcomputer 1, and the switching transistor 8 and 10 are connected to the ON / OFF operation of the operation switch 4 and the battery 2
The switching circuit 12 connects and disconnects the power supply path from the power supply to the microcomputer 1.

A resistor 14 and a capacitor 15 are connected in series with the ground electrode 13 at the input point B of the transistor 10 in the latter stage of the operation switch 3, and the resistor 1
4 and the middle point C of the capacitor 15 are connected to the input terminal b of the microcomputer 1 for receiving the operation start command signal. Here, the resistor 14 and the capacitor 15 compose the operation command signal delay circuit 16 corresponding to the configuration of the present invention.

A switching transistor 17 is provided at the collector of the transistor 10 at the subsequent stage of the operation switch 3.
The (PNP type) base is connected to the transistor 17
Is connected to the input point D of the regulator 7 to which the battery voltage VD is applied. The collector of the transistor 17 is grounded via a pair of dividing resistors 18 and 19. Further, a capacitor 20 is connected in parallel to the ground side division resistor 19, and further,
The dividing resistor 18, the dividing resistor 19 and the capacitor 20.
The middle point E between the parallel circuit and the parallel circuit is connected to the input terminal c for monitoring the battery voltage of the microcomputer 1.

Here, the transistors 10 and 17 and the dividing resistors 18 and 19 form a battery voltage signal circuit 21 corresponding to the configuration of the present invention.
The capacitor 20 constitutes a battery voltage signal delay circuit 22.

In FIG. 1, 23 is a battery voltage monitoring means provided in the microcomputer 1 as a functional configuration of the microcomputer 1, and 24 is a LE in response to a command from the battery voltage monitoring means 23.
An LED drive circuit for lighting or blinking the D lamp 25, a reference numeral 26 generates a signal corresponding to the combustion state of the burner 4 by a detection signal of a combustion sensor 27 constituted by a thermocouple or the like provided in the vicinity of the burner 4, and causes the microcomputer 1 to Combustion signal generation circuit to be input, 28 is burner 4 according to a command from microcomputer 1.
An electromagnetic valve drive circuit for opening / closing driving an electromagnetic valve 29 provided in the gas supply path 5 to the heating target 30 is heated by a detection signal of a temperature sensor 31 including a thermistor provided in the center of the burner 4 A temperature signal generation circuit that generates a signal according to the temperature and outputs it to the microcomputer 1, 33 is an operator 34
This is a gas amount adjusting valve for adjusting the gas supply amount to the burner 4 by the operation of.

Next, the operation of the electronic device of this embodiment will be described.

First, when the operation switch 3 is turned off, the transistors 8, 10 and 17 are in the cutoff state (OFF.
Therefore, the battery voltage VD or the regulator voltage VR is not supplied to the microcomputer 1 or the like, and the battery 2 is hardly consumed.

Next, when the operation switch 3 is turned on, the output point A of the regulator 7 and the input point B of the base of the transistor 10 become conductive via the resistor 9 and the operation switch 3, so that the regulator voltage is applied to the input point B. A voltage VR1 (operation start command signal) which is substantially equal to VR is generated. Since this voltage VR1 is a high-level voltage signal, the emitter and collector of the transistor 10 are electrically connected to the ground electrode 13 side, and thus a low-level (substantially ground level) voltage signal is applied to the base of the transistor 8. To be done. As a result, conduction is established between the emitter and collector of the transistor 8 on the power supply path 6, and at this time, the voltage from the battery voltage VD to the regulator 7 is increased.
And the voltage VR2 (≈regulator voltage VR) generated in the subsequent stage of the transistor 8 via the transistor 8 is supplied to the power supply terminal a of the microcomputer 1 as its operating power supply,
The microcomputer 1 is activated. In this embodiment, the power supply to the microcomputer 1 is started in about 5 ms after the operation switch 3 is turned on.

At this time, the voltage VR2 is controlled by the LED drive circuit 24, the combustion signal generation circuit 26, and the solenoid valve drive circuit 2.
8 and the temperature signal generation circuit 30 are also supplied with power as these operating power sources.

As described above, the voltage VR1 generated at the input point B of the base of the transistor 10 when the operation switch 3 is turned on.
Is charged in the capacitor 15 via the resistor 14 of the operation command signal delay circuit 16. At this time, the charging voltage V of the capacitor 15 generated at the midpoint C of the resistor 14 and the capacitor 15
C rises from a low level voltage to a high level voltage with a delay of a time constant determined by the resistance value of the resistor 14 and the capacitance of the capacitor 15. And the charging voltage VC
Rises to a high level voltage (≈VR1),
The operation start command signal is input to the input terminal b of the microcomputer 1, and in response to this, the microcomputer 1 operates the solenoid valve drive circuit 2
Control of 8 etc. is started.

In this case, the timing of inputting the operation start command signal to the microcomputer 1 is set appropriately by setting the resistance value of the resistor 14 and the capacitance of the capacitor 15 so that the power source for operating the microcomputer 1 is set. The power supply start timing is delayed, and in the present embodiment, the delay is about 5 ms, for example.

On the other hand, as described above, the O of the operation switch 3
When the transistor 10 is turned on to the ground side by the N operation, a low level voltage is applied to the base of the transistor 17, and the emitter and collector of the transistor 17 are turned on. Therefore, the battery voltage VD is applied to the dividing resistors 18 and 19 and the capacitor 20. At this time,
The capacitor 20 is charged with a time constant determined by its capacity and the resistance values of the dividing resistors 18 and 19, and finally the battery voltage VD is divided by the dividing resistors 18 and 19 to obtain a voltage VX (this is the battery (Proportional to voltage VD). Then, this voltage VX is input to the input terminal c of the microcomputer 1 as a battery voltage signal.

In this case, the microcomputer 1 of the battery voltage signal corresponding to the battery voltage VD generated by the dividing resistors 18 and 19
The timing of the input to the delay resistor 18 and 19 and the capacitance of the capacitor 20 are set appropriately so that they are delayed from the timing of starting the power supply of the operating power source to the microcomputer 1 described above. In this embodiment, the delay is about 5 ms, for example.

When the microcomputer 1 is activated, the battery voltage monitoring means 23 sends the battery voltage signal (voltage VX) to A /
After D conversion, the value is compared with a predetermined reference value, and when the battery voltage signal (voltage VX) drops below the reference value, the LED lamp 25 is passed through the LED drive circuit 24.
Lights up or blinks, thereby informing the user that the battery 2 needs to be replaced.

Further, when the microcomputer 1 detects the misfire of the burner 4 by the signal input from the combustion signal generating circuit 26 during its operation, it closes the solenoid valve 29 via the solenoid valve drive circuit 28. The gas supply to the burner 4 is cut off.

Further, the microcomputer 1 uses, for example, a burner 4
When the object 32 to be heated is heated by the combustion of the
When the overheating of the burner 4 is detected, the solenoid valve 29 is closed via the solenoid valve drive circuit 28, thereby cutting off the gas supply to the burner 4 and stopping the combustion of the burner 4.

Next, when the operation switch 3 is turned off, the base current of the transistor 10 is cut off and the transistor 10 is turned off (OFF state). Following this, the transistors 8 and 17 are also turned off. .
Therefore, the power supply path 6 from the battery 2 to the microcomputer 1 or the like is cut off, power supply to the microcomputer 1 or the like is stopped, and
Input of the operation start command signal and the battery voltage signal to the microcomputer 1 is also stopped. The solenoid valve 29 of the gas supply path 5 is closed by shutting off electricity to a solenoid (not shown) for keeping the valve open.

As described above, in the electronic device of this embodiment, the power is supplied from the battery 2 to the microcomputer 1 etc. only when the operation switch 3 is turned on, that is, when the gas stove is operated. Therefore, the power consumption of the microcomputer 1 and the like is reduced, and the life of the battery 2 can be extended as long as possible.

Further, the input of the operation start command signal and the battery voltage signal to the microcomputer 1 is surely performed after the power is supplied to the microcomputer 1, so that the deterioration of the microcomputer 1 can be prevented and these signals can be prevented. The control operation of the microcomputer 1 according to the input can be ensured.

In this embodiment, the electronic equipment in the gas stove has been described as an example, but the present invention is not limited to this, and the present invention can be applied to various electronic equipment using a battery as a power source. Is.

In this embodiment, the electronic equipment including both the operation start command circuit and the battery voltage signal circuit has been described. However, the present invention can be applied to an electronic equipment including only one of them. Of course there are.

[0038]

As is apparent from the above description, according to the first aspect of the present invention, the power supply path from the battery to the microcomputer is connected by the switching circuit in conjunction with the ON / OFF operation of the operation switch. In addition to shutting off, the operation start command signal generated and output by the operation start command circuit in synchronization with the ON operation of the operation switch is input to the microcomputer by the delay circuit at a timing later than the timing of power supply to the microcomputer. By doing so, the power consumption of the microcomputer can be reduced to extend the battery life, the deterioration of the microcomputer can be prevented, and the microcomputer according to the input of the operation start command signal can be prevented. The operation of can be ensured.

According to the second aspect of the present invention, the power supply path from the battery to the microcomputer having the battery voltage monitoring means for monitoring the electromotive voltage of the battery is linked to the ON / OFF operation of the operation switch. The switching circuit is used to connect and disconnect, and the battery voltage signal generated and output by the battery voltage signal circuit in tandem with the ON operation of the operation switch is delayed by the delay circuit to the microcomputer at a timing later than the timing of power supply to the microcomputer. By inputting the signal to the computer, it is possible to reduce the power consumption by the microcomputer to extend the life of the battery, prevent the microcomputer from deteriorating, and respond to the input of the battery voltage signal. It is possible to ensure the operation of the microcomputer.

[Brief description of drawings]

FIG. 1 is an explanatory configuration diagram of an example of a battery-powered electronic device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Microcomputer, 2 ... Battery, 3 ... Operation switch, 6 ... Power supply path, 11 ... Operation start instruction circuit, 12 ... Switching circuit, 16 ... Operation designation signal delay circuit, 21 ...
Battery voltage signal circuit, 22 ... Battery voltage signal delay circuit, 23
... Battery voltage monitoring means.

Claims (2)

[Claims] 1. A microcomputer for controlling the operation of an electronic device using a battery as a power source, and an operation start command circuit for generating and outputting an operation start command signal to the microcomputer in conjunction with an ON operation of an operation switch of the electronic device. In a battery-powered electronic device including: a switching circuit for connecting and disconnecting a power supply path from the battery to the microcomputer in conjunction with ON / OFF operation of the operation switch; and operation start of the operation start command circuit. A battery-powered electronic device, comprising: an operation command signal delay circuit that inputs a command signal to the microcomputer at a timing later than the timing of conduction of the power supply path by the switching circuit. 2. A microcomputer that controls the operation of an electronic device by using a battery as a power source, and a battery voltage signal corresponding to the electromotive voltage of the battery is generated in the microcomputer in conjunction with an ON operation of an operation switch of the electronic device. A battery-powered electronic device having a battery voltage signal circuit for outputting, wherein the microcomputer has battery voltage monitoring means for monitoring the electromotive voltage of the battery based on the battery voltage signal of the battery voltage signal circuit, From the power switch to the microcomputer to turn on / off the operation switch
A switching circuit that conducts / shuts off in conjunction with an operation, and a battery voltage signal delay circuit that inputs the battery voltage signal of the battery voltage signal circuit to the microcomputer at a timing later than the timing of conduction of the power supply path by the switching circuit. And a battery-powered electronic device.