JP2002187504A - Wiring of on-vehicle electric part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise generated from a wire connecting electric parts and a control part in the case of using a pulse width modulation(PWM) control to drive the electric part by using a battery having a voltage higher than a rated voltage in wiring the on-vehicle electric parts. SOLUTION: The minus side of the electric part is returned to the control part. Additionally, electric wires 3 connecting the control part and the electric parts 2 are made into twist part wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an in-vehicle motor,
The present invention relates to wiring for connecting an electric component such as a lamp and a control unit including a computer and a semiconductor switch.

[0002]

2. Description of the Related Art In recent years, attempts have been made to use a 42V generator and a 36V battery in automobiles for efficient use of electric power. However, in automobiles,
Since a 2V battery has been used, the rated voltage of electric components such as a motor and a speaker mounted on a vehicle is typically 12
V. Pulse width modulation (PWM) control is used to drive the electrical component using a battery with a voltage higher than the rated voltage of the electrical component. Usually, as shown in FIG. 3, a control unit for controlling the drive current of the electric component by PWM control and one side of two terminals of the electric component are connected by an electric wire, and the other terminal of the electric component is , Directly connected to ground.

[0003] The frequency of the PWM control is usually 100 Hz to
Since the frequency is 20 kHz, when PWM control is performed, a pulse current having a frequency of 100 Hz to 20 kHz flows through an electric wire connecting the control unit and one of two terminals of the electric component. When a current having such a frequency flows through an electric wire, noise from the electric wire, which has no problem with direct current, is generated. If this electric current is received by another electric wire, malfunction may occur.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a computer, a semiconductor device, and a method for controlling an electric component using a battery having a voltage higher than the rated voltage of the electric component by using pulse width modulation (PWM) control. An object of the present invention is to reduce noise generated from an electric wire connecting a control unit including a switch and an electric component, thereby preventing malfunction of the electric component.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for driving an electric component using a battery having a voltage higher than the rated voltage of the electric component. One of the two terminals is connected to a high-voltage power supply and the other is connected to a semiconductor switch in the control unit.
It is possible to reduce noise generated from an electric wire connecting the electric component and the control unit. In addition, if a twisted pair wire is used as an electric wire connecting the electric components mounted on the vehicle and the control unit,
This is preferable because noise is canceled and the effect of noise reduction is enhanced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, and the contents will be described with reference to the drawings. FIG. 1 shows an automobile
An example of wiring using a 42V power supply is shown for efficient use of power. Since a 12 V power supply is usually used in automobiles, a higher voltage power supply is used. Power (42V) 1 is supplied from the control unit, or
Preferably, the power is distributed and supplied in the control unit, and the current is supplied to the electric component 2 serving as a load, and the negative side of the electric component is returned to the control unit and connected to the semiconductor switch 8 for controlling the driving current of the electric component. I do. With such wiring, it is possible to reduce noise generated from the electric wire connecting the electric component and the control unit. When the twisted pair wire 3 is used as an electric wire connecting the control unit and the electric component 2, noise is canceled and the effect of noise reduction is enhanced.

FIG. 2 shows another embodiment of the present invention, the contents of which will be described with reference to the drawings. FIG. 2 is similar to FIG. 1 in that it is an example of wiring using a 42V power supply for efficient use of electric power in an automobile. Figure 2 shows that the electrical components
In the case of a motor that requires forward rotation and reverse operation,
4 shows an example of wiring used to drive the motor. In the control section, the semiconductor switch 8 is assembled in an H-bridge circuit, and the output section and the motor 2 are connected by two electric wires. In particular, it is preferable to use the twisted pair wire 3 as the electric wire.

[0008]

According to the present invention, instead of connecting one of the two terminals of the electric component and the power source with an electric wire and directly dropping the negative side of the electric component to ground as in the prior art,
By returning the negative side of the electric component to the control unit, it was possible to reduce the generation of noise from the electric wire even if the drive current of the electric component was PWM-controlled. In particular, it was effective to use a twisted pair wire for the electric wire connecting the control unit and the electric component.

[Brief description of the drawings]

FIG. 1 shows an example of a wiring according to the present invention.

FIG. 2 shows another example of the wiring of the present invention.

FIG. 3 shows an example of a conventional wiring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply 2 Electric parts 3 Twisted pair wire 4 Microcomputer (for PWM control) 5 Ground 6 Other electric wires 7 Electric wire connecting a control part and electric parts 8 Semiconductor switch 9 Pulse (for PWM control) 10 H bridge circuit 11 Control part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasumitsu Yamanaka 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in the Auto Network Engineering Laboratory Co., Ltd. 5G363 AA09 BA02 DC02 5H570 AA21 BB07 CC04 DD06 HA08 HB12 HB16 JJ03 JJ30

Claims (3)

[Claims] When a current is controlled by a pulse width control method for energizing a vehicle-mounted electrical component using a battery having a voltage higher than the rating of the electrical component, two terminals of the electrical component are provided. A wiring for electrical components mounted on a vehicle, wherein one end is connected to a high-voltage power supply, and the other end is connected to a semiconductor switch in a control unit including a computer and a semiconductor switch. 2. A motor in which electric components require forward and reverse operations. When a current is supplied to the motor by using a battery having a voltage higher than the rating of the motor, a current is controlled by a pulse width control method. A semiconductor switch assembled in an H-bridge circuit in a control unit, and an output unit of the H-bridge circuit is connected to two terminals of the motor. 3. The wiring of a vehicle-mounted electric component according to claim 1, wherein a twisted pair wire is used as an electric wire connecting the control unit and the electric component.