JP2829990B2 - Vehicle charge control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle charge control device, and more particularly to a charge control device suitable for driving a high-voltage load operating at a voltage higher than a battery voltage.

[Related Art] A charge control device includes a voltage control circuit that controls ON / OFF of a rotor coil excitation current of a vehicle charging generator to maintain an output voltage of the charging generator at a predetermined regulated voltage. .

In recent years, it has been attempted to provide a window heater to quickly eliminate the freezing of the vehicle window. Since such a window heater requires a large amount of electric power, when the window heater is operated, the adjustment voltage is reduced to a battery charging voltage (for example, 14.5 V).
The voltage is changed to a much higher voltage (for example, 60 to 100 V) to keep the output current of the charging generator relatively small.

By the way, the excitation current of the rotor coil of the charging generator is generally supplied from the output of the charging generator itself except at the start of power generation, that is, a so-called self-excited type. Compared to the separately encouraged ceremony
By applying a voltage higher by the voltage drop of the charging line or the like, a sufficient exciting current flows particularly when a large-capacity electric load is used, and the power generation output can be increased.

[Problems to be Solved by the Invention] However, always supplying a current to the rotor coil in a self-excited manner increases the output voltage of the charging generator during high-voltage load operation as described above. Flow and burned out.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a vehicle charging control device that does not have a risk of burning a rotor coil of a charging generator when a high-voltage load operates.

[Means for Solving the Problems] The charging control device of the present invention connects the on-vehicle battery 1, the high-voltage load 2 operating at a voltage higher than the battery voltage of the on-vehicle battery 1, and the charging generator 3 as described above. Connection switching means 4 for selectively switching between on-vehicle battery 1 and high voltage load 2
And controlling the power generation of the charging generator 3 so that the charging generator 3
Voltage control means 5 for maintaining the generated voltage at the battery charging voltage when the battery is connected to the vehicle-mounted battery 1 and for maintaining the generated voltage at the high voltage when the charging generator 3 and the high-voltage load 2 are connected.
When the charging generator 3 is connected to the vehicle-mounted battery 1, the power generation output of the charging generator 3 is supplied to the rotor coil 31 of the charging generator 3 without passing through the ignition switch 52. And a supply switching means 6 for supplying the output of the on-vehicle battery 1 to the rotor coil 31 when the vehicle is connected to the high-voltage load 2.

[Operation] In the charging control device having the above-described configuration, in a use state of charging the vehicle-mounted battery, the output voltage of the charging generator is maintained at the battery charging voltage, and the generated output maintained at the battery charging voltage is supplied to the ignition switch. The rotor coil is supplied to the rotor coil without using a long wiring, and an appropriate exciting current without power supply loss flows in the rotor coil.

In a use state in which the high-voltage load is operated, the output voltage of the charging generator is increased to and maintained at a predetermined high voltage. In this case, the rotor coil is supplied with the battery voltage output of the vehicle-mounted battery. Also in this case, an appropriate exciting current flows through the rotor coil.

First Embodiment Referring to FIG. 1, a charging generator 3 is connected to an engine and rotates, and a rotor coil 31 that generates a rotating magnetic field, a stator coil 32 that generates an AC power output, and a rectifier that rectifies the AC power output. It is composed of a wave rectifier 33.

The DC output of the charging generator 3 is supplied to the vehicle-mounted battery 1 and the window heater 2 via the charging line 34, and a connection switching relay 4 is provided in the charging line 34 so that the vehicle-mounted battery 1 and the window heater 2 are provided. And the connection of the charging generator 3 are selected. The connection switching relay 4 selectively connects the vehicle-mounted battery 1 as shown in the non-excited state.

The positive electrode of the rotor coil 31 is connected to the output terminal of the charging generator 3 via the supply switching relay 6 without passing through the ignition switch 52, and is connected to the vehicle-mounted battery 1 via the diode 51 and the ignition switch 52. ing. The contacts of the relay 6 are normally closed. The negative electrode of the rotor coil 31 is connected to a transistor 53, and the excitation current of the rotor coil 31 is ON-OFF controlled by the transistor 53.

The operation of the transistor 53 is controlled by the output of the voltage control circuit 5, and the voltage control circuit 5 uses a known circuit to maintain a constant feedback voltage fed back via a sensing line 54 input thereto. The transistor 53 is controlled.

The sensing line 54 reaches the vehicle-mounted battery 1 via the diode 55 and a voltage dividing resistor via the diode 56.
It is connected to 57 and 58 connection points. The voltage dividing resistors 57 and 58
Is connected between the charging line 34 and the ground.

The connection switching relay 4 and the supply switching relay 6 are excited by a computer 7. In the figure, reference numeral 59 denotes a charge lamp.

 The operation of the charging control device having the above configuration will be described below.

When the window heater is not operated, neither the connection switching relay 4 nor the supply switching relay 6 is excited.
When the ignition switch 52 is turned on in this state, the battery voltage (12 V) is supplied to the rotor coil 31 via the charging line 34 and the supply switching relay 6, and the rotor coil 31 is initially excited.

When the engine is started and the power generation of the charging generator 3 is started, the voltage control circuit 5 turns on / off the transistor 53 so that the battery charging voltage fed back through the sensing line 54 becomes a constant value, and the charging is performed. The output voltage of the generator 3 is maintained at about 14.5V. In this state, the diode 51 is reverse-biased and power supply to the rotor coil 31 via the ignition switch 52 is prohibited, and power supply loss to the rotor coil 31 via the supply switch 6 and the ignition switch 52 is prevented. The above-described output voltage is supplied without using a long wiring with the above.

When the window heater 2 is operated, the connection switching relay 4 and the supply switching relay 6 are excited by the computer 7. Thereby, the charging line 34 is connected to the window heater 2 side, the contact of the relay 6 is opened, and the rotor coil 31 is disconnected from the output terminal of the charging generator 3.

The divided voltage is input to the voltage control circuit 5 from the voltage dividing resistors 57 and 58, and the transistor 53 is turned on so that the divided voltage becomes a constant value.
With the -OFF operation, the output voltage of the charging generator 3 is raised and maintained at 60 to 100 V, which is sufficient to drive the window heater 2.

In this case, a battery voltage of 12 V is supplied to the rotor coil 31 via the ignition switch 52 and the diode 51.

Thus, when the window heater is not operated, the rotor coil of the charging generator is self-excited to supply sufficient electric power to the large-capacity electric load, and when the window heater is operated, the rotor coil is separately energized to prevent burning.

[Second Embodiment] In the present embodiment, the switching of the voltage supply to the rotor coil is
This is performed by a voltage detection circuit in place of the switching relay of the first embodiment.

That is, in FIG. 2, the voltage detection circuit 8 is provided in the charging line. The circuit 8 includes voltage dividing resistors 81, 8
2. It is composed of a Zener diode 83, NPN transistors 84 and 85, a PNP transistor 86, and the like, and its detection voltage is set to, for example, 20V. The positive electrode of the rotor coil 31 is connected to the collector of the transistor 86.

 Other configurations are the same as those of the first embodiment.

With this configuration, when the window heater is not operating, the voltage of the charging line 34 is lower than 20 V, so that the transistor 84 is turned off and the transistors 85 and 86 are turned on. Are supplied.

When the window heater 2 operates, the charging line voltage is 20
V. As a result, the transistor 86 is turned off, and the battery voltage is supplied to the rotor coil 31.

According to this embodiment, the same effects as those of the above embodiment can be obtained, and the trouble of wiring and the like is not required as compared with using a relay.

FIG. 3 shows another example of the voltage detection circuit 8, and the circuit configuration can be further simplified by making the transistor 87 in the output stage an NPN type.

[Effects of the Invention] As described above, according to the charging control device of the present invention, when the high-voltage load is not operating, the rotor coil can be self-excited and a sufficient power generation output can be obtained. The rotor coil can be separately excited to prevent its burning.

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram of an apparatus showing a first embodiment of the present invention,
FIG. 2 is a main part circuit diagram showing a second embodiment of the present invention, and FIG. 3 is a circuit diagram showing another example of the voltage detection circuit. DESCRIPTION OF SYMBOLS 1 ... In-vehicle battery 2 ... Wind heater 3 ... Charge generator 31 ... Rotor coil 4 ... Connection switching relay (connection switching means) 5 ... Voltage control circuit (voltage control means) 6 ... Supply switching relay ( Supply switching means) 7 Computer 8 Voltage detection circuit (Supply switching means)

Claims (1)

(57) [Claims] 1. A vehicle-mounted battery, a high-voltage load operating at a voltage higher than the battery voltage of the vehicle-mounted battery, and connection switching means for selectively switching connection of a charging generator to the vehicle-mounted battery and the high-voltage load; By controlling the power generation of the charging generator, the power generation voltage is maintained at the battery charging voltage when the charging generator is connected to the vehicle-mounted battery, and the power generation voltage is maintained at the high voltage when the charging generator is connected to the high-voltage load. When the charging generator and the vehicle-mounted battery are connected to each other, a self-excited state in which the power output of the charging generator is supplied to the rotary coil of the charging generator without passing through the ignition switch is set. A vehicle charge control device comprising: a supply switching unit that supplies the output of the on-vehicle battery to the rotor coil when the vehicle is connected to a voltage load, so as to be in a separately excited state.