JPH03273828A - Power supply for on-vehicle equipment - Google Patents

Abstract

PURPOSE:To eliminate polarities of an on-vehicle equipment to facilitate wiring by connecting a full-wave rectifier with a battery and by connecting the control circuit of the on-vehicle equipment with the output end of the full-wave rectifier. CONSTITUTION:Output terminals A and B of a full-wave rectifier 7 are respectively positive and negative irrespective of connection polarities of a battery 1 and the input terminal of the fullwave rectifier 7. Therefore, the on-vehicle equipment 12 viewed from the battery 1 side can be made non-polar and, even if the battery 1 is connected in a state shown in the drawing, the on-vehicle equipment 12 including a control circuit 5 operates normally without breaking. Further, a similar working effect can be obtained when a semiconductor device 4 is replaced with a relay contact and this relay contact is controlled by a control circuit 4 and only the control circuit 5 is connected with the output terminals A, B of the full-wave rectifier 7. Thus, the polarities of the on-vehicle equipment 12 to be connected with the battery 1 without using a fuse are eliminated so that wiring is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply device for on-vehicle equipment using a battery as a power source.

BACKGROUND OF THE INVENTION In recent years, as automobiles have become more sophisticated, the number of types of in-vehicle equipment such as in-vehicle air purifiers has increased.

Conventionally, the power supply circuit of this type of vehicle-mounted equipment has generally had a configuration as shown in FIG.

The configuration will be explained below.

As shown in the figure, a battery 1 is a power source installed in a car, and is connected to a motor 3 as a load of in-vehicle equipment through a fuse 2. A semiconductor element 4 is connected in series to the motor 3. The semiconductor element 4 is controlled by the force to control the rotation speed or on/off of the motor 3, and the motor 3 drives a fan of an air purifier or the like. The diode 6 is connected to the battery 1 through the fuse 2 in the opposite direction.

When such in-vehicle equipment is installed in a car, battery 1
When wiring the battery 1, if the polarity of the battery 1 is mistakenly connected, a large current will flow through the diode 6, blowing the fuse 2, and preventing the control circuit 5 from being destroyed.

Problems to be Solved by the Invention In such conventional power supply circuits for in-vehicle equipment, whenever an operator makes a wiring mistake, the fuse 2 built into the in-vehicle equipment or provided on the wiring must be replaced. This had a major problem in that it was very difficult to work with, and without the fuse 2, the on-vehicle equipment would be unable to operate.

The present invention has been made to solve the above-mentioned problems, and aims to facilitate wiring by eliminating the polarity of in-vehicle equipment connected to a bath battery.

Means for Solving the Problems In order to achieve the above object, the present invention connects a full-wave rectifier to a battery, and connects at least a control circuit of an in-vehicle device having a control circuit to an output terminal of the full-wave rectifier. This is used as a means of solving problems.

Effect of the Invention By using the above-mentioned problem solving means, the present invention can make the control circuit, which has the risk of being destroyed when connected to the battery with reverse polarity, non-polarized, and there is no need to be conscious of polarity when connecting to the battery.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. Note that components having the same configuration as those of the conventional example are given the same reference numerals, and description thereof will be omitted.

As shown in the figure, the full-wave rectifier path 7 has a diode 8°9.1
The full-wave rectifier 7 is connected to the battery 1, and the series circuit of the motor 3 and the semiconductor element 4 and the control circuit 6 are connected to the output terminals A and B. Note that the motor 3, the semiconductor element 4, and the control circuit 5 constitute an on-vehicle device 12.

To explain the operation in the above configuration, the output terminals A and B of the full-wave rectifier 7 have a positive terminal and a negative terminal B, regardless of the connection polarity between the battery 1 and the input terminal of the full-wave rectifier 7. Therefore, the in-vehicle device 12 viewed from the battery 1 side can be made non-polarized, and even if the battery 1 is connected with the opposite polarity to the illustrated state, the in-vehicle device 12 including the control circuit 6 will operate normally and will not be destroyed. There is no. Note that similar effects can be obtained even if the semiconductor element 4 is replaced with a relay contact, the relay contact is controlled by the control circuit 6, and only the control circuit 6 is connected to the output terminals A and B of the full-wave rectifier 7.

Effects of the Invention As is clear from the above embodiments, according to the present invention, a full-wave rectifier is connected to the battery, and at least a control circuit of an in-vehicle device having a control circuit is connected to the output terminal of the full-wave rectifier. , it is possible to eliminate the polarity of the in-vehicle equipment connected to the battery, making wiring easier, and even if you do not have to be aware of the polarity when connecting to the battery, you will not damage the in-vehicle equipment including the control circuit. You can connect the battery without any knowledge.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a power supply device for vehicle-mounted equipment according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional power supply device for vehicle-mounted equipment. 1...Battery, 6...Control circuit, 7
...Full wave rectifier, 12... Automotive equipment.

Claims (1)

[Claims] A power supply device for a vehicle-mounted device, comprising: a full-wave rectifier connected to a battery; and at least a control circuit of the vehicle-mounted device having a control circuit connected to an output terminal of the full-wave rectifier.