JPS58101811A - Seat heater device for automobile - Google Patents

Abstract

PURPOSE:To prevent overdischarge of a battery, by constituting an engine key switch not to relate to conduction of an electric current to a seat heater and both warming the heater optionally even at stopping of a car and cutting off the current in a conduction circuit at low battery voltage or the like. CONSTITUTION:At warming of a heater, under a closed condition of a door switch 14, firstly a manual switch 13 is temporarily turned ON. Then an electric current is conducted to flow in a relay 12, and this relay 12 turns ON a relay switch 10 to flow a current in a heating wire 9 in a seat heater 8, thus a seat is warmed. Under this condition, if a battery 7 decreases its voltage below a set level, an output of a voltage comparator 17 becomes almost zero to turn OFF a semiconductor switch 15 and the relay switch 10 in a circuit of the relay 12 and stop the current conduction to the heater 8. While at conduction of current in the heater 8, if a door is opened, the door switch 14 is opened to release the relay 12, in this way, the relay switch 10 is turned OFF to stop the current conduction to the heater 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile seat heater device equipped with a safety device.

Generally, an automobile heater device has an engine key switch 3 and a power switch 4 inserted into a circuit for supplying electricity from an automobile battery 1 to a seat heater 2, as shown in FIG. In addition, 6 in the figure is a thermostat that is installed near the heating wire 6 of the seat heater 2 and opens when abnormal temperature is detected.
It is a cut.

This device cuts off power to the seat heater 20 when the engine key switch 3 is removed, so it is possible to prevent over-discharging of the car battery 1 while the car is stopped, but if the engine key switch 3 is not in the ON state, the seat heater 2 In other words, it is impossible to heat the seat while the vehicle is parked or stopped, and the engine must be operated to heat the seat while the vehicle is parked or stopped.

The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to enable the seat heater to be energized regardless of the engine switch, and to prevent the seat heater from being energized due to over-discharging of the automobile battery or forgetting to turn off the switch. To achieve this object, the present invention includes a seat heater powered by an automobile battery, and includes a normally open manual switch and a relay switch connected in parallel to the manual switch in the energizing circuit of the seat heater. A relay is provided that is energized via a manual switch and a relay switch in parallel to control the relay switch, and a door switch and a semiconductor switch are provided in the circuit of this relay. The switch is opened.

With this configuration, the engine key switch is not involved in energizing the seat heater, so you can warm up at any time while driving, parking, or stopping, and once the door is opened, the energization circuit for the seat heater remains unchanged even when the door is closed. This has the effect of preventing over-discharging of the car battery, as well as ensuring safety.

An embodiment of the present invention will be explained below based on FIG. 1.

In the figure, 7 is an automobile battery, and a thermostat 11 for preventing overheating is provided in the circuit for supplying electricity from the automobile battery 7 to the heating wire 9 of the seat heater 8, with a relay switch 10 placed near the insertion point. There is.

12 is a relay that controls the relay switch 10, and a manual switch 13, a door switch 14, and a semiconductor switch 16 are inserted into a circuit that is energized by the automobile battery 7. The manual switch 13 is configured to be normally open, and is connected in parallel to the relay switch 1o. Further, the door switch 14 is a switch that is closed when the door of the automobile is closed.

16 is an overdischarge prevention device, which has a voltage comparator 17 as its main element, divides the voltage of the automobile battery 1 with resistors 18 and 19, and provides it as a non-inverting input, and also provides the voltage of the reference power source 20 as an inverting input. There is. The semiconductor switch 15 of the circuit of the relay 12 is controlled to open and close based on the output thereof. Note that the reference power source 20 is composed of, for example, a constant voltage diode.

In the automobile seat heater device having the above configuration, when the door is closed and the door switch 14 is closed, and the manual switch 13 is temporarily turned ON in this state, the relay 1
2 is energized, and the relay switch 10 is turned on by this relay 12.

Therefore, the heat generating wire 9 of the seat heater 80 is energized, and the seat heater 8 can take heat. On this sheet -280
Since the key switch is not involved in energization, heating can be done regardless of whether the vehicle is running, parked, or stopped.

Next, during this heating process, if the voltage of the automobile battery 7 drops below the set voltage, for example 12V, the output of the voltage comparator 17 becomes almost zero, and therefore the relay 12
The semiconductor switch 16 of the circuit turns OFF. Therefore, the relay switch 1o is turned off, and the power supply to the seat heater 8 is cut off. That is, car battery 7
When the voltage drops, the load circuit is disconnected, and over-discharge of the automobile battery 7 can be prevented.

Further, when the seat heater 8 is energized, for example, when the door is opened when exiting the vehicle, the door switch 14 of the relay 120 circuit is temporarily opened.

At this time, the relay 12 does not work, so the relay switch 10
is opened, and power to the seat heater 8 is turned off. Even if the door is further closed from this state and the door switch 14 is closed, both the manual switch 13 and the relay switch 10 are open, so the relay 12 is not energized and the seat heater 8 is not energized. This means that, for example, the seat heater 8 is automatically turned off when the user exits the vehicle, and accidents caused by forgetting to turn off the switch do not occur.

Note that in order to heat the seat again using the seat heater 8, the manual switch 13 may be pressed temporarily.

As explained above, the seat heater device according to the present invention prevents over-discharging of the automobile battery, eliminates problems caused by forgetting to turn off the switch, and furthermore, since the engine key switch is not involved, the seat heater device according to the present invention prevents over-discharge of the automobile battery. It has the benefit of being able to collect heat regardless of the weather.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an automobile seat heater device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional automobile seat heater device. 7... Car battery, 8... Seat heater, 10... Relay switch, 12...
...Relay, 13...Manual switch, 14
...Door switch, 16...Semiconductor switch, 16...Overdischarge prevention device.

Claims (1)

[Claims] A seat heater powered by an automobile battery, a normally open manual switch provided in the energizing circuit of the seat heater, a relay switch connected in parallel to the manual switch, and either the manual switch or the relay switch. a door switch and a semiconductor switch provided in the energization circuit of the relay; and a door switch and a semiconductor switch provided in the energization circuit of the relay; and a door switch and a semiconductor switch provided in the energization circuit of the relay; An automobile seat heater device consisting of an overdischarge prevention device that opens.