JPH07298502A - Battery charger - Google Patents

Abstract

PURPOSE:To provide a battery charger in which the starting operation is simplified while avoiding damage to the circuit due to wiring miss or work miss. CONSTITUTION:The battery charger comprises means for detecting abnormality of the circuit, the power supply voltage, etc., when start of charging is designated through connection of a charging receptacle 3, and a controller 7 serving as means for starting the charging operation by starting ON/OFF control of thyristors 10, 11 when no abnormality is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charger for charging a battery for electric vehicles such as electric vehicles and forklifts.

[0002]

2. Description of the Related Art Conventionally, for example, in order to charge a battery of an electric vehicle, after a user performs a preparatory operation required to start charging, a charging start switch, a timer, etc. are operated to start charging and an AC is applied to the charging device. It is common to supply power.

[0003]

However, in the above-mentioned conventional method, the charging is started only after the user starts the charging operation. Has a problem in that it is troublesome to wait for the supply of power at midnight and perform the charging start operation. Further, in order to make this operation unnecessary, a device that automatically performs a charging start operation when AC power is supplied by another timer or the like is required.

In the conventional method, the specified voltage may not be supplied to the battery due to an incorrect wiring of the battery when replacing the battery or an error in the construction of the AC power supply. Therefore, charging is not performed normally and an overcurrent flows and the fuse However, there is a problem such as melting. In addition, when charging, the user must always perform a charging start operation such as switching on a switch.

The present invention has been made in view of the above-mentioned problems of the prior art, and can reduce the time and effort required for the user to start charging, and can avoid damage to the circuit due to wiring mistakes or construction errors. Is intended to provide.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a charging device for charging a battery of an electric vehicle, a charging start instruction means for instructing start of charging, and a charging circuit and a power supply voltage for instructing start of charging. It is characterized by including an abnormality detecting means for detecting an abnormality and a charging starting means for starting charging when no abnormality is detected.

[0007]

According to the charging apparatus of the present invention, when the charging start instructing means gives an instruction to start charging, the abnormality detecting means detects an abnormality in the charging circuit and the power supply voltage. Then, when no abnormality is detected, the charging is started by the charging start means. As described above, the charging device is provided with the abnormality detecting means for detecting an abnormality before the start of charging and the charging starting means for starting the charging when no abnormality is detected, so that the labor of the manual charge start operation can be reduced. . For example, in the case of using the midnight power, charging is not started because it is judged that the power supply voltage is abnormal until the midnight power supply time zone, and charging is automatically started in this time zone. It is not necessary to wait for the supply and perform the charging start operation. Further, it is possible to detect an abnormality in the charging circuit or the power source before energization. For example, if wiring is mistaken when the battery is replaced, charging is not started, and therefore damage to the circuit can be avoided.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views for explaining a battery charging device according to an embodiment of the present invention, FIG. 1 is a diagram schematically showing a circuit configuration of the above-mentioned embodiment device, and FIG. 2 is a diagram of the embodiment device. It is a flow figure for explaining operation.

In these figures, reference numeral 1 shows a battery charging device in the body of an electric vehicle to which current is supplied from an AC power source 2 through a charging outlet 3. The charging device 1 is connected to a transformer 4 that transforms the power supply voltage supplied from the charging outlet 3 and a secondary coil 4a of the transformer 4, and a rectifying circuit 5 that rectifies the AC current from the AC power supply 2. A battery 6 to which the rectified current is supplied, and a controller 7 that controls the rectifying circuit 5.

The rectifier circuit 5 is composed of diodes 8 and 9 and thyristors 10 and 11. The controller 7 controls the thyristors 10 and 11 to control the current supplied to the battery 6. It is like this. Instead of the thyristors 10 and 11, any switch can be used as long as it can be controlled by the controller 7.

The controller 7 is a power supply voltmeter 22 for detecting the voltage on the primary coil 4a side of the transformer 4.
Main voltage detection circuit 23 for detecting the voltage, current and frequency of the secondary coil 4b of the transformer 4, main current sensor 24, and main frequency detection circuit 25, the transformer 4, a transformer for detecting the temperature of the battery 6. It is provided with an input interface 17 to which the detected values from the temperature sensor 26 and the battery temperature sensor 27 are input. Further, the controller 7 includes a CPU 18 that performs arithmetic processing based on a signal input to the input interface 17,
A ROM 19 and a RAM 20 in which programs and data for the arithmetic processing are stored, and an output interface 21 for outputting the result of the arithmetic processing to the thyristors 10 and 11 as a control signal.

The controller 7 is provided with a control program for controlling the thyristors 10 and 11 based on the detected values from the voltage detection circuit, current sensor, temperature sensor and frequency detection circuit, for example, a power supply. When the charging is instructed by the supply of the voltage, the thyristors 10 and 11 are controlled to be turned on and off as an abnormality detecting means for detecting an abnormality in the circuit and the power supply voltage based on the detected values, and when the abnormality is not detected. It functions as a charging start means for starting charging.

Next, the operation of the charging process of the apparatus of the above embodiment will be described with reference to FIG. When the charging outlet 3 is connected and the charging device 1 is connected to the AC power source 2, when a charging start is instructed, a control computer (not shown) in the controller 7 is started, and 10 seconds later, the control computer is started. The program is started (steps S1 to S5). In the case of using the midnight power, for example, even if the charging outlet 3 is connected, the control computer does not start until the midnight power supply time zone. On the other hand, in the above time zone, the control computer is started and the control program is started.

First, the power supply voltage is 170 VAC to 24
If it is not within the range of 0 VAC, it is determined that the power supply voltage is abnormal and the abnormality signal (A) is output. If within the range, it is determined that the main voltage is abnormal or normal (steps S6 to S).
8). If the main voltage is not in the range of 115V to 140V, it is determined that the main voltage is abnormal and an abnormality signal (A) is output. If it is in the range, it is determined that the temperature of the battery 6 is abnormal or normal (step S9). ~ S10).

When the temperature of the battery 6 exceeds the set value, it is determined that the battery temperature is abnormal, and an abnormal signal (B) is output. If the temperature is below the set value, the current sensor is abnormal.
Normality is determined (steps S11 to S12). If the current sensor is abnormal, an abnormality signal (A) is output, and if normal, it is determined whether the temperature of the transformer 4 and the switch are normal or abnormal (steps S13 to S14).

If the temperature of the transformer 4 is abnormal, an abnormal signal (B) is output, and if normal, it is judged whether the frequency is normal or abnormal (steps S15 to S16). If the frequency is not within the allowable range, it is determined to be abnormal and an abnormal signal (A) is output. If it is within the allowable range, charging of the battery 6 is started by starting ON / OFF control of the thyristors 10 and 11. (Step S1
7-S18).

The abnormal signal (A) stops the charging process and maintains the stopped state, and the abnormal signal (B) stops the charging process and indicates an abnormal temperature. The above-mentioned stopped state is released when it is resolved.

The battery charging device 1 thus constructed
Then, when the charging start is instructed, the controller 7 detects an abnormality based on the detection values from the voltmeters, ammeters, and temperature sensors based on the control program, and when the abnormality is not detected, the controller Charging is started when 7 starts the on / off control of the thyristors 10 and 11.

Thus, before charging the battery 6, the power supply voltage, the main voltage and current sensor,
Since the abnormality detection means for checking the temperature of the battery 6 and the transformer 4 and the frequency of the power supply supplied to the battery 6 is provided, an abnormality due to a battery wiring error, an AC power supply construction error, or the like is detected before charging. Therefore, the time and effort required for the user to start the charging can be reduced, and the circuit can be prevented from being damaged.

In the above embodiment, the case where the connection of the charging outlet is the charge start instructing means has been shown, but the charge start instructing means of the present invention is not limited to this, and, for example, the switch provided separately. The charging may be started and used as a charging start instruction means.

[0021]

As described above, according to the battery charger of the present invention, the charging start instruction means for instructing the start of charging, the abnormality detection means for detecting an abnormality in the charging circuit and the power supply voltage, and the abnormality detection Since the charging start means for starting charging when not being performed is provided, an abnormality in the charging circuit and the power supply voltage can be detected before charging, and thus the user's trouble can be reduced and circuit damage etc. can be avoided. .

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a circuit configuration of a battery charger according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the apparatus of the above embodiment.

[Explanation of symbols]

 1 Charging device 6 Battery 7 Controller (charging start means)

Claims (1)

[Claims] 1. A charging device for charging a battery of an electric vehicle, comprising charge start instructing means for instructing start of charging, and abnormality detecting means for detecting an abnormality in a charging circuit and a power supply voltage when instructed to start charging. And a charging start unit that starts charging when no abnormality is detected.