JPS62118719A - Charge controller of charged cleaner exclusive for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a charging system m'ii for a rechargeable vacuum cleaner exclusively for vehicles.

2. Description of the Related Art Conventionally, this sand charging side 1-ipa arrangement is constructed as shown in FIG. Reference numerals 1, 2, and 11 are a generator, a stabilized power supply device, and a battery, respectively, provided in the vehicle. Here, the charging control device is connected to the stabilized Ti source a-bll of the vehicle. A current limiting resistor 3, a contact of a relay 4, and a battery 5 are connected in series between terminals a and b. relay 4
A transistor 6 is connected in series to the excitation coil as shown in the figure. A resistor 7 and a thyristor 8 are connected in series between the connection point between the relay contact and the resistor 3 and the terminal, and the connection point between the resistor 7 and the thyristor 8 is connected to the pace terminal of the transistor 6. A resistor 9 is connected between the gooto cathode of the thyristor 8, and a Zener diode 10 is connected between the gate of the thyristor 8, the contact of the relay 4, and the connection point of the resistor 3.

According to the above configuration, when charging of the battery 5 is not completed, no current flows through the Zener diode 10, the thyristor 8 is in an off state, and current flows into the base of the transistor 6 via the resistor 7, and the transistor 6 is on. state. As a result, a current flows through the excitation coil of the relay 4, the contacts of the relay 4 close, and a charging current flows into the battery 5 through the resistor 3, sustaining charging. However, as the charging of the battery 5 progresses, the voltage between the terminals of the battery 5 increases, and when it reaches the set voltage of the Zener diode 10, direct current flows through the Zener diode 10, current flows to the gate of the thyristor 8, and the thyristor 8 Turns on.

As a result, the transistor 6 is turned off, the contacts of the relay 4 are opened, and the charging is stopped.

Problems to be Solved by the Invention According to such a conventional configuration, charging current continues to flow from the battery 11 even when the car engine is stopped. Since the capacity of the battery 11 on the vehicle side is limited, there is a problem in that the capacity of the battery 11 decreases if it is repeatedly charged as described above while the engine is stopped.

SUMMARY OF THE INVENTION An object of the present invention is to provide a charge control circuit for a car-specific rechargeable vacuum cleaner that can prevent the capacity of a car battery from decreasing.

Means for Solving the Problems The rechargeable vacuum cleaner for cars according to the present invention is configured such that the battery of the rechargeable vacuum cleaner is connected to the vehicle's DC power line for charging, and the DC power line is connected to the vehicle engine. The present invention is characterized in that a voltage detection circuit is provided to detect that the voltage has dropped to a specified voltage at the time of stopping, and the voltage detection circuit is configured to stop the charging when the voltage of the DC power supply line is detected to have decreased to the specified voltage.

Function: According to this configuration, the vehicle engine is stopped and the operating status is controlled.
Changes in the car's power supply voltage (detected by the engine, and charging is cut off when the engine is stopped).

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. Components that have the same functions as those in Fig. 3 are given the same reference numerals (descriptions thereof are omitted). Vehicle DC power terminal a
-b, a current limiting resistor 3, a contact of a relay 4, and a battery 5 are connected in series. A resistor 7 and a thyristor 8 are connected between a and b, and a connection point between the resistor 7 and thyristor 8 is connected to the base of a transistor 12.

A diode 13 is connected between the emitter of the transistor 12 and the terminal, and a resistor 15 is connected between the collector and the base of the transistor 14. A Zener diode 10 and a resistor 9 are connected in series between the connection point between the relay 4 and the resistor 3 and the terminal, and the connection point between the resistor 9 and the Zener diode 10 is connected to the gate of the thyristor 8. Further, a series circuit of resistors 16 and 17 and a series circuit of resistor 18 and Zener diode 19 are connected in parallel between DC power supply terminals a and b, respectively, and the connection point of resistors 16 and 17 and the resistor 18 and Zener diode are connected in parallel. 19 connection points are connected to the non-inverting input/° terminal and the inverting input terminal O of the comparator 20, respectively. A series circuit of resistors 21 and 22 is connected between the output terminal and the terminal of the comparator 20, and the midpoint thereof is connected to the base of the transistor 6.

Also, the excitation coil of relay 4 is connected to transistors 14 and 6 in series.

Normally, when the engine is running, the voltage between terminals a and b is as high as 13 volts or more, and when the engine is stopped, the voltage of the battery 11 is constant! 8 voltage becomes 12 volts. When the voltage between terminals a and b is as high as 13 volts or more, the divided voltage Vs of resistor 16°17 is lower than the reference voltage Vp composed of Zener diode 19.
becomes higher, the output terminal of the comparator 20 becomes "H" level, and the transistor 6 is turned on. Further, the transistor 14 operates to be in an on state when the voltage between the terminals of the battery 5 is low in an uncharged state, and to be in an off state when charging is completed.

When the battery is released and the engine is running and uncharged, both transistors 14 and 6 are turned on, and relay 4 is turned on, operating to maintain charging. When the engine stops here, the output terminal of the comparator 20 becomes L'' level, so the transistor 6 is turned off and charging is stopped.

As described above, the engine operates to detect the state of the engine (running or stopping) and turn charging ON/OFF. Second
Figure (aHb) shows this state. FIG. 2(a) shows changes in the DC power supply voltage of the vehicle. During normal engine operation, the voltage fluctuates as shown in the figure due to fluctuations in the rotational speed of the generator 1. Generally, in this case, the power supply voltage changes e'! above 13 volts. Liru. However, when the engine is stopped, the voltage drops to the vehicle's battery voltage (generally 12V). This change is detected by the comparator 20 to control the charging current shown in FIG. 2(b).

The charging control of the present invention has more than the effects of the invention! The I device is capable of detecting whether the vehicle's engine is running or not, and then controlling the charging current, allowing optimal charging without causing any trouble to the vehicle's battery. It also has the advantage that it can be constructed at low cost, and its practicality [1] is extremely large.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the charge-limiting device of the present invention, FIG. 2 is an explanatory diagram of the operation of FIG. 1, and FIG. 3 is a block diagram of a conventional charging amount 6I] device. 1... Vehicle generator, 2... Stabilized power source for wheels, 4
・・・Relay, 5...Rechargeable battery, 6,14
...Transistor, 11...Vehicle battery, 1
6.17.18...Resistor, 19...Zener diode, 20...Comparator''-* Operating Figure 2 Time (di) Mi Unity

Claims (1)

[Claims] 1. The battery of the rechargeable vacuum cleaner is connected to the vehicle's DC power line for charging, and a voltage detection circuit is provided to detect when the DC power line has dropped to a specified voltage when the vehicle engine is stopped. . A charging control device for a rechargeable vacuum cleaner for use in a car, wherein the voltage detection circuit is configured to stop the charging when a drop in the DC power supply line voltage to a specified voltage is detected.