JPH0529201U - Vehicle power supply - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the number of pairs of electromagnetic switches that open and close the primary winding circuit of each phase of a three-phase transformer that boosts the three-phase AC low voltage of a three-phase AC generator, and reduce the number of devices. To reduce the size and weight, reduce the price, and improve reliability. [Configuration] Primary windings 11u, 1 of each phase of the three-phase transformer 11
An electromagnetic switch 18 is provided on the side of the neutral points of 1v and 11w, and the pair of contacts is two or three pairs to open and close the circuit of the primary winding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle power supply device that rectifies an AC voltage of an AC generator driven by rotation of an engine and supplies the AC voltage to a DC load.

[0002]

[Prior Art]

 In a power supply device for vehicles such as automobiles, a three-phase AC generator is driven by the rotation of an engine to rectify a three-phase AC low voltage into a DC low voltage, which charges a storage battery and supplies it to a DC load. Further, there is one in which a three-phase AC voltage is boosted by a transformer, which is rectified into a DC high voltage and supplied to a high voltage DC load (for example, an electric heater for window glass).

As a power supply device of this type, there is one disclosed in JP-A-63-69500. FIG. 4 is a circuit diagram of a conventional vehicle power supply device. Reference numeral 1 is a three-phase AC generator, in which a stator armature core is provided with a three-phase armature winding 2, and a rotor magnetic pole core is equipped with a field winding 3. The AC generator 1 is driven by the rotation of the vehicle engine. Reference numeral 4 is a rectifier that rectifies the three-phase AC low voltage of the AC generator 1 and outputs a DC low voltage. Reference numeral 5 is a voltage regulator that detects the output voltage of the rectifier 4 and adjusts the exciting current so that it becomes a predetermined value. . The AC generator 1, the voltage regulator 5 and the rectifier 4 constitute a charging generator. Reference numeral 7 is a storage battery, and 8 is a low-voltage DC load. U, V, and W are wirings for each of the three phases from the armature winding 2.

Next, 11 is a step-up three-phase transformer, 12 is a rectifier that rectifies the three-phase AC high voltage of the secondary winding of the transformer 11 and supplies a DC high voltage, and 13 is the transformer 11. Electromagnetic switches for opening and closing the circuits to the primary windings 1u, 11v, and 11w, 14 is a load switch, and 15 is a high-voltage DC load. It consists of an electric heater that melts. This electric heater is made by laminating an ultra-thin film metal resistor between laminated glass, and the resistance value cannot be less than about 2Ω due to the transparency of light. Therefore, a high DC voltage of about 50 to 60 V is required.

The electromagnetic switch 13 is configured as shown in FIG. 16a is each fixed contact of the V and W phase wires, 16b is each fixed contact to the primary windings 11u and 11w of the transformer 11, 16c is a normally open movable contact facing each of these contacts 16a and 16b, When the exciting coil 17 is energized, it is closed by electromagnetic force. The exciting coil 17 is energized by a low DC voltage, but its circuit is not shown.

In the power supply device, a three-phase AC low voltage is rectified, a DC low voltage is applied to the storage battery 7 to be charged, and a low voltage DC load 8 is applied. On the other hand, by inserting the electromagnetic switch 13, the three-phase AC low voltage is boosted by the three-phase transformer 11, the three-phase AC high voltage is rectified, and the DC high voltage is supplied to the high-voltage DC load 15. When the DC load 15 is not used, the electromagnetic switch 13 is turned off to prevent no-load loss due to energization of the primary windings 11u to 11w when the three-phase transformer 11 is unloaded. In particular, the AC generator 1 is operated in a wide rotation speed range, the frequency of the AC output voltage changes greatly, and the no-load loss is large especially in the low frequency range.

[0007]

[Problems to be solved by the device]

 In the conventional vehicle power supply device as described above, at least two phases need to be cut off to cut off the power supply to the primary windings 11u to 11w of the three-phase transformer 11, and four pairs of contact points are required. I was trying. Since the energizing current (primary current) of the electromagnetic switch 13 is large, the contact capacity per pair also becomes large, the electromagnetic switch 13 becomes large, the external shape of the device becomes large, the weight also increases, the price increases, Moreover, there is a problem that reliability is lowered due to multiple contacts.

The present invention was made in order to solve such a problem, and reduces the number of contact pairs of an electromagnetic switch that cuts off the power supply to the primary winding of a three-phase transformer, thereby reducing the size and weight of the device. The purpose is to obtain a power supply device for a vehicle, which reduces the price and improves reliability by reducing the number of contact pairs.

[0009]

[Means for Solving the Problems]

 A vehicle power supply device according to the present invention is an electromagnetic switch for opening and closing each phase on a neutral side of a primary winding of each phase of a three-phase transformer to which a three-phase AC low voltage of a three-phase AC generator is input. Is provided and the contact pairs are made into two pairs or three pairs.

[0010]

[Action]

 In this invention, the primary winding of the three-phase transformer is provided with fixed contacts for at least two phases of the neutral-point side wire of the Y connection, and corresponding movable contact parts are connected for three phases. Open and close the primary winding of the connection at the neutral point side.

[0011]

【Example】

 FIG. 1 shows an embodiment of a vehicle power supply device according to the present invention, and 1 to 5, 7, 8, 11, 11v to 11w, 12, 14, and 15 are the same as those in FIG. The primary windings 11u to 11w of the three-phase transformer 11 are Y-connected so that the neutral point side is opened and closed by the electromagnetic switch 18. The electromagnetic switch 18 is as shown in FIG. A fixed contact 16a is provided on each of the primary windings 11u and 11w, and the corresponding movable contact 16c is integrally coupled as a common pole by a support piece 16d. The support piece 16d is connected to the neutral point side line of the primary winding 11v. The exciting coil 17 for opening and closing the movable contact 16c by electromagnetic force is energized by a low voltage DC voltage, but its circuit is not shown. Thus, the electromagnetic switch 18 is opened and closed by the two pairs of contacts.

FIG. 3 is a block diagram of an electromagnetic switch showing another embodiment of the present invention. The electromagnetic switch 19 that opens and closes the neutral point side of each primary winding of the three-phase transformer 11 is provided with fixed contacts 16a on the neutral point side lines of the primary windings 11u, 11v, and 11w. A movable contact 16c is provided corresponding to each fixed contact 16a, and each movable contact is integrally connected by a support piece 16d. Reference numeral 17 is an exciting coil for opening and closing each movable contact 17b. In this way, the electromagnetic switch 19 is opened and closed by the three pairs of contacts.

[0013]

[Effect of the device]

 As described above, according to the present invention, the electromagnetic wave for opening and closing each phase is connected to the neutral point side of the primary winding of each phase of the three-phase transformer that boosts the three-phase AC low voltage of the three-phase AC generator. Since a switch is provided and the number of fixed and movable contact pairs is two or three, the number of contact pairs is reduced, the device is smaller and lighter, the cost is reduced, and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of a vehicle power supply device according to the present invention.

FIG. 2 is a schematic configuration diagram of the electromagnetic switch of FIG.

FIG. 3 is a schematic configuration diagram of an electromagnetic switch showing another embodiment of the present invention.

FIG. 4 is a circuit diagram of a conventional vehicle power supply device.

5 is a schematic configuration diagram of the electromagnetic switch of FIG.

[Explanation of symbols]

 1 three-phase AC generator 4 first rectifier 7 storage battery 8 low voltage DC load 11 three-phase transformer 11u, 11v, 11w primary winding 12 second rectifier 15 high voltage DC load 16a fixed contact 16b movable contact 18, 19 Electromagnetic switch

Claims (1)

[Scope of utility model registration request] 1. A three-phase AC generator that is driven by rotation of an engine of a vehicle to generate a three-phase AC low voltage, and rectifies the three-phase AC low voltage to supply a DC low voltage to a storage battery and a low-voltage DC load. A first rectifier, a three-phase transformer for boosting the three-phase AC low voltage, and a second rectifier for rectifying the boosted three-phase AC high voltage into a DC high voltage and supplying it to a high-voltage DC load. In a power supply device for a vehicle equipped with an electromagnetic switch that opens and closes a circuit of a primary winding of the three-phase transformer, each phase primary winding of the three-phase transformer is Y-connected and the electromagnetic point is provided on a neutral point side. A switch is provided, and the electromagnetic switch is provided with fixed contacts for at least two of the primary windings of each phase,
Provided with movable contacts facing these fixed contacts,
A power supply device for a vehicle, characterized in that a neutral point is closed by closing a movable contact so that each phase primary winding is energized.