JP3047415B2 - Automotive air purifier - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted air purifier that is controlled by a switch provided on a front seat side of a vehicle.

2. Description of the Related Art A conventional on-vehicle air purifier is generally as shown in FIG.

2, the operation of the battery 1 will be described. The battery 1 is connected to the power switch 3 through the wiring 2 inside the vehicle.
The motor 4 and the power semiconductor 5 are connected in series. 6
Is a stabilized power supply transistor whose constant voltage is generated at the emitter by the Zener diode 7 at the base.
This constant voltage 7 supplies all power in the circuit. Further, the control of the motor 4 is configured such that the input of the comparator 9 is controlled by the hand switch 8 through the in-vehicle wiring 2. 10 is a control circuit block.

Problems to be Solved by the Invention However, in the conventional configuration, two in-vehicle wirings are required to connect the power switch 3 and two in-vehicle wirings are required to connect the hand switch 8 for motor control. This necessitates an increase in the number of in-vehicle wirings, resulting in poor wiring workability.

The present invention has solved such a conventional problem and has an object to simplify a circuit configuration.

Means for Solving the Problems An in-vehicle air purifier for connecting an in-vehicle air purifier main body and a switch via an in-vehicle wiring, wherein the purifier main body includes a motor for controlling electric power supplied from a power supply to the motor. A control circuit, a stabilized power supply for supplying power for operating the motor control circuit, and a comparator for stopping power supply by the stabilized power supply, wherein the comparator, the motor control circuit, and the switch are provided. Each of the switches is connected by one vehicle wiring, and the switch switches and applies a predetermined voltage to either the comparator side or the motor control circuit side, and the comparator operates when the predetermined voltage is applied. To stop the power supply.

In the present invention, a predetermined voltage can be applied to either the comparator or the motor control circuit by switching the switch, so that when the switch is switched to the motor control circuit, the motor control circuit supplies power to the motor, and If the predetermined voltage is not applied to the comparator via the in-vehicle wiring, the stabilized power supply is set in the operating state, so that power for operating the motor control circuit is also supplied. On the other hand, when the switch is switched to the comparator side, the comparator detects a predetermined voltage via the wiring in the vehicle, and the comparator stops the operation of the stabilized power supply. Therefore, power for operation is not supplied to the motor control circuit, and power supply from the power supply to the motor is cut off. As described above, only one in-vehicle wiring for stopping the operation of the stabilized power supply, that is, one in-vehicle wiring corresponding to the conventional power switch is required, and the in-vehicle wiring workability can be improved.

Embodiment A control circuit of a vehicle air purifier according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes an automobile battery, in which a motor 12 and a power semiconductor 13 are connected in series. The gate of the power semiconductor 13 is connected to the pull-up resistor 14 and the output of the comparator 15. These power semiconductors 13 and comparators
A motor control circuit is constituted by 15 and the like, and the power supplied from the battery 11 as a power supply to the motor 12 is controlled. The input of the comparator 15 is given a constant voltage by the resistors 16 and 17. The input is connected to one terminal of a switch 19 via an in-vehicle wiring 18. The common terminal of the switch 19 passes through the vehicle interior wiring 18 and is connected to the ground of the control circuit. Reference numeral 20 denotes a constant voltage transistor whose emitter output is kept at a constant voltage by a Zener diode 21 connected to the base. This output voltage is
It supplies all power to the circuit, including 22. The output of the second comparator 22 is connected to the base of the constant voltage transistor 20, and its input is supplied with a constant voltage by dividing the voltage of the battery 11 by the resistors 23 and 24. The input is connected to another terminal of the switch 19 through the wiring 18 in the vehicle.

The operation of the control circuit configured as described above will be described below. First, when the switch 19 is connected to the terminal on the left side of the figure, the terminal of the comparator 15 has the same potential as the ground, so that the output becomes High, the power semiconductor 13 turns ON, and the motor 12
Rotates. At this time, a voltage to be supplied to the circuit is generated at the emitter output of the constant voltage transistor 20.

Next, when the switch 19 is connected to the right side of the figure, the input of the second comparator 22 has the same potential as the ground, and the voltage of the input is higher. Has the same potential as the ground. Then, the constant voltage transistor 20 is cut off, and no voltage is generated at the emitter output. As a result, the supply of all power to the circuit is stopped, so that the control circuit is all off, and the motor also stops rotating.

In this way, with one switch, control of the circuit and power supply
It can be turned off.

If the common terminal of the switch 19 is directly connected to the vehicle body, wiring inside the vehicle can be further reduced.

According to the present invention, only one in-vehicle wiring for stopping the operation of the stabilized power supply, that is, one in-vehicle wiring corresponding to a conventional power switch is required, and the workability in the in-vehicle wiring can be improved.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram of a vehicle air purifier according to an embodiment of the present invention, and FIG. 2 is a conventional control circuit diagram. 11… Battery, 18… In-car wiring, 19 …… Switch,
21: Zener diode, 22: Second comparator.

Claims (1)

(57) [Claims] 1. An on-vehicle air purifier for connecting an on-vehicle air purifier main body and a switch via an in-vehicle wiring, wherein a motor control circuit for controlling electric power supplied from a power supply to a motor is provided on the purifier main body side. A stabilized power supply for supplying power for operating the motor control circuit, and a comparator for stopping power supply by the stabilized power supply, wherein each of the comparator, the motor control circuit, and the switch is one. The switch is adapted to switch and apply a predetermined voltage to either the comparator side or the motor control circuit side, and when the predetermined voltage is applied, the switch controls the power from the stabilized power supply. In-vehicle air purifier that stops supply.