JPS6312319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply control circuit for an alarm device that issues warnings such as forgetting to turn off vehicle lamps and other warnings.

A known method is to automatically turn off the lights even if the lights are on when the ignition switch of the car is turned off and the car is exited. However, even if the lights were automatically turned off after getting out of the car at night, there was a drawback that the lights would turn on when the ignition switch was turned on the next morning. Also, a system has been proposed that provides audible warnings regarding various vehicle conditions, such as when there is little fuel remaining or when the engine is overheated. The alarm device that gives such a warning can be stopped by turning off the ignition switch and stopping the engine, so its power can also be turned off by turning off the ignition switch. becomes.

The present invention uses the above-mentioned alarm device to warn of forgetting to turn off lamps, so if the lamps are forgotten to be turned off, even if the ignition switch is turned off until the warning ends, the alarm device does not operate. The purpose of this invention is to enable the supply of power with a simple configuration. Examples will be described in detail below.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is a power supply control circuit, 2 is an alarm device, 3 is a speaker, and 4 is a battery. The alarm device 2 has an alarm sound recorded on a magnetic tape, magnetic drum, etc., and reproduces and outputs the alarm sound in response to an abnormality detection signal al such as fuel shortage or temperature rise. A signal ack indicating that voltage B is supplied and an alarm sound is being output is applied to the power supply control circuit 1. This signal ack can be formed from, for example, a rotation command signal for a motor that drives a magnetic tape or a magnetic drum.

The power supply control circuit 1 also includes an ignition signal ig that indicates whether the ignition switch is on or off, a lamp signal LP that indicates whether the lamps are on or off, and a signal hp that indicates that the lamps have been forgotten to be turned off or has been alarmed.
is applied, and the voltage B from the battery 4 to the alarm device 2 is increased depending on the conditions of these signals ig, lp, ack, and hp.
It controls the supply and stop of the

FIG. 2 is a circuit diagram of an embodiment of the present invention, and
1, G2 is Noah Gate, G3 is Nand Gate, Q
1, Q2 are transistors, D1 to D5 are diodes, R1 to R4 are resistors, C1 is a capacitor,
LPF is a low pass filter and PL is a relay.
By turning on the ignition switch, the signal ig becomes "1". Therefore, the base current of transistor Q2 is supplied through resistor R2 and diode D3, transistor Q2 is turned on, current flows through relay RL, and the contact is switched from b to a as shown in the drawing. This relay to alarm device 2
Voltage B is supplied from the battery 4 through the RL contact. That is, when the ignition switch is turned on, the operating voltage B is supplied from the battery 4 to the alarm device 2.

When the lamps are off, the signal lp is "0", and when the alarm sound is not being output, the signal ack is "0". In this way, when the ignition switch is turned off with the signal lp="0" and the ack="0", the signal ig becomes "0", and since the output of the NOR gate G2 is "1", the transistor Q1 is turned on, and the base of transistor Q2 becomes ground potential, turning it off. Therefore, relay RL is restored,
The supply of operating voltage B to the alarm device 2 is stopped.

When the lamps are on, the signal lp becomes “1”,
When the ignition switch is turned off in this state, the outputs of the NOR gates G1 and G2 are "0", so the transistor Q1 is off and the signal ig
Even if becomes “0”, resistor R3 and diode D4
The base current of transistor Q2 is supplied through
is supplied with an operating voltage B.

The alarm device 2 can immediately output a warning sound for forgetting to turn off the lamps under the conditions of ig = “0” and lp = “1”, but for example, the opening/closing signal dr when the door is opened to get off the car can be output. It is preferable to output the warning sound under these conditions. Since the signal ack is "1" while this alarm sound is being output, even if the lamps are turned off and the signal lp is "0" during the output, the outputs of the NOR gates G1 and G2 are "0", so the transistor Q1 is off, transistor Q2 is on, and operating voltage B is supplied to alarm device 2.

When the lamps are turned off and the signal lp is "0" and the signal ack becomes "0" due to the end of the alarm sound output, the output of the NOR gate G2 becomes "1", so the transistor Q1 is turned on and the transistor Q2 is turned off. Therefore, the operating voltage B to the alarm device 2 is turned off.

Also, when the ignition switch is turned off while the alarm device 2 is outputting an alarm sound, the signal ack is “1”.
Therefore, the outputs of the NOR gates G1 and G2 are "0" and the transistor Q1 is off, and the transistor Q2 is on, so the operating voltage B is supplied to the alarm device 2.

When the alarm audio output ends, the signal ack becomes "0", but if the lamps are lit and lp = "1",
If the alarm is something other than forgetting to turn off the lights,
hp = "0", the output of NAND gate G3 is "1", the output of NOR gate G1 is "0" regardless of the signal ack, and the output of NOR gate G2 is "0", so transistor Q1 is turned off and transistor Q2 is turned off. It turns on and the operating voltage B is supplied to the alarm device.

Next, I was warned that I forgot to turn off the lamps, and hp = “1”
Therefore, the output of NAND gate G3 becomes "0".
After the alarm ends, the fall of the signal ack causes a negative differential pulse to be applied to the input of the NOR gate G1 via the capacitor C1, and the output of the NOR gate G1 becomes "1", turning on the transistor Q1.
Transistor Q2 is off, and therefore operating voltage B is off. When the lamps are off, i.e.
When lp = “0”, the signal ack after the alarm ends is “0”
Therefore, the output of Noah gate G2 becomes “1”,
Transistor Q1 is turned on, transistor Q2 is turned off, and operating voltage B is turned off.

As explained above, in the present invention, when the ignition switch is turned on, the transistor Q2 is turned on to operate the relay RL, and the operation of the relay RL supplies the operating voltage B from the battery 4 to the alarm device 2. , a signal ack indicating that an alarm such as an alarm sound or chime sound is being output from the alarm device 2;
and when the signal lp indicating lighting of lamps is off,
Transistor Q2 is turned off by bypassing the base current of transistor Q2 supplied by the operating relay RL with transistor Q1, and even if the ignition switch is turned off, if you forget to turn off the lamps, an alarm will be issued. Keep relay RL operating until output, and alarm device 2
The operating voltage B can be supplied from the battery 4 to the battery 4. Furthermore, even if the lamps are turned off during the alarm output, the operating voltage B can be turned off when the alarm output ends. Therefore, by using an alarm device that warns of fuel shortages, etc., it is possible to warn people who have forgotten to turn off lamps, and by turning off the ignition switch, the operating voltage B can be turned off after the alarm is output or immediately, thereby reducing unnecessary power consumption. This can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG.
The figure is a circuit diagram of an embodiment of the present invention. 1 is a power supply control circuit, 2 is an alarm device, 3 is a speaker, 4 is a battery, G1 and G2 are Noah gates, G
3 is a NAND gate, Q1 and Q2 are transistors,
RL is a relay, D1~D5 are diodes, R1~
R4 is a resistance.

Claims (1)

[Claims] 1. In a power supply control circuit that supplies operating voltage from a battery to an alarm device that outputs an alarm in response to an abnormality detection signal, etc., a relay that supplies operating voltage from the battery to the alarm device, and the relay is connected to an ignition switch. is on and the base current is supplied by the operation of the relay, and the transistor that supplies the operating current of the relay, the signal indicating that the alarm device is outputting an alarm, and the signal indicating that the lamps are lit are turned off. A power supply control circuit for an alarm device, comprising a gate circuit and a transistor that sometimes bypasses a base current supplied by the operation of the relay to turn off the transistor.