JPS5815436A - Charger 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 The present invention relates to an in-vehicle charging device used for charging in-vehicle equipment.

Conventionally, when charging a built-in battery such as a portable radio from a battery installed in a car while the engine is running, it is possible to charge it while the engine is running, but when the engine is stopped, power is supplied only from the built-in battery, so it is not possible to charge the radio while it is being charged. If left unattended, there is a risk that the car's battery will over-discharge and the car will not be able to perform its original functions when restarted, so it was necessary to provide a means to stop charging after a certain period of time.

The present invention eliminates these problems, and when the Hawk Bull radio is used together with an on-board radio, the charger and the built-in battery of the radio are photoelectrically operated while the engine is running. The built-in battery of the portable radio is fully photoelectric for a preset period of time in the event of a stop (1) Automatically stops the charger operation after 7 hours to prevent excessive discharge of the car's battery, 1: Una in-vehicle The aim is to provide a charger for

Examples of the present invention will be described below with reference to tooth surfaces.

In FIG. 1, I indicates a part of an adapter including an on-vehicle charger according to an embodiment of the present invention, ■ indicates a portable wireless device, and ■ indicates a power supply section of an automobile.

In adapter part I that includes photoelectric devices, block A is a timer part, and when switch SA and engine key SK are turned off, which supplies power from batch IJ-BM of the car to the charger, charger B, which will be described later, is activated for a certain period of time. It consists of a timer circuit that supplies all the power to the

Block Bid is an electronically operated charger that receives power from the car battery BM via block Ai, charges the built-in battery BP of the portable wireless device H, and converts the WVC voltage of the wireless device itself to supply power. It consists of a voltage boosting section 21, a voltage leggy, a ration section 22, and a current limiting circuit 23. Block C is a transmission bypass circuit. 3 is a portable wireless device consisting of a main body W including a wireless transmitting section, a wireless receiving section, an antenna duplexer or a transmitting/receiving switching section, and a control section, and a built-in battery BP.

AM is a car antenna, Ap is a mobile antenna, M is a microphone, and P and T are breath talk switches.

■ is a power supply mounted on a car, ship, aircraft, etc., EG is the engine of the car, G is a generator connected to the car engine EG, and BM is the car battery (piezoelectric power source) charged by the generator G. ) used for starting automobile engines, ignition, and lighting. DB indicates a diode for preventing backflow when the engine is stopped.

The power supply voltage vM supplied from the automobile power supply (1) varies greatly depending on the maintenance state, driving speed, and power usage conditions (day and night), and the range of variation is thought to be about 11 to 15V.

Next, details of each part will be explained. In the timer part A of the charging adapter part I, 1 to 11, ■+ (anti-R+, R2゜l
・A timer starting part consisting of Runsisters Ql and Q2, 12 is an electronic timer, for example, an rc (I,
), and by changing the constant value of frll, the timer's operating time can be freely set from a few seconds to about a week. This IC (11) connects the terminal ■ to turn on the transistor Q2. ”: It can be grounded and the operation can be started. 13 is a power switch circuit, which is composed of a transistor U*04% resistance R6 rate, and I C (I,
) is applied to the base of transistor 04 via resistor R5 to turn it on, and transistor Q6 is also turned on to supply power to charger B. Electronic timer section 1
2, the power switch circuit 13 is turned on for a preset time period, for example, about 37 hours, and the photoelectric device B
After supplying power to the device, the power switch circuit 13 is automatically turned off.

The switch Syc is an engine key and is turned ON in conjunction with the power switch of the ignition circuit of the automobile, and remains ON while the engine is operating. While the switch SK is ON, the 1 timer 1 activation section 11 of the charging adapter ■ is OFF, and the timer section 12 is in a dormant state.
Through the bypass circuit 14 -04, Cs, transistor Q5. Q6, resistors R8 and R9.

This is a voltage boosting circuit composed of Rho and Rat, and is for boosting the voltage of the main battery BM to a voltage suitable for the sub battery BP. The booster circuit 21 performs intermittent operation according to changes in the pulse width from the voltage regulator circuit 22,
The energy stored in the coil L1 is superimposed on the DC power from the power switch circuit 13 of the timer part A and sent to the current limiting circuit 23.

The voltage regulator circuit 22 is, for example, a switching regulator control IC, AN-5 manufactured by Matsushita Electronics Co., Ltd.
900 and capacitor-06, C7, Ca diode D2
, resistor R'2+ R+x, R+4, Zener diode Z1. Z2, current limiting circuit 23
The output voltage is outputted from the resistor R2n and fed back to the feeder node 1.1 of the IC (Engine 2), which changes the pulse width proportionally to the voltage of the Zener diode Z2 connected to the terminal ■. , and is sent to the voltage booster circuit 21 from the terminal ■. The Zener diode Z1 and the resistor R12 are connected to the IC (
It forms the power supply stabilization circuit of I2).

The current limiting circuit 23 limits the current flowing to the Votaple radio device (■), but when transmitting by pressing the breath talk switch RT of the microphone M, this current is
It is regulated not to exceed 3A. This current varies depending on the transmission output and frequency used.

Now, the resistor R+s is set so that, for example, 0.768 or more does not flow, and the output voltage becomes, for example, 1 to the voltage booster l1vt, 21 switching regulator circuit 22.
When stabilized at 4°8V, this power can power the built-in battery (auxiliary battery) BP of the portable wireless device up to, for example, 0.8V.
The battery is charged at 76 A, and the current is reduced as the built-in battery Bp is charged. The output of resistor R15 is resistor R+6
The current is fed back to the transistor 07, increasing the internal resistance and limiting the current below a predetermined current.

The diode D6 is a reverse current prevention diode that prevents a reverse current from occurring when the output voltage of the charging adapter part I is lower than the voltage of the built-in battery Bp of the voke-pull wireless device (2).

The block C in the charging adder-free part I is a bypass circuit that directly supplies power from the automobile power supply (2) when the portable wireless device H transmits, and directly sends the current ip during transmission via the resistor R+7 and the diode D4. At the same time, current IR is supplied from charging adapter B, and current IB is supplied from the built-in battery (IR> O, 5A), making the total current 1.
T-1P+iR"-1B, and iT is 2 to 3A.

Now, when the car is stopped and engine gear is turned off, the switch SK is turned off. At the same time, the electronic timer 12 is activated by the transistor Q2 of the timer activation section 11.This switching is extremely short, and the capacitor 03 suppresses this interruption.Electronic timer part 12 As mentioned above, after the preset time has elapsed, the power supplied to transistor Q4 is reduced and the power switch circuit 1
3 is turned OFF to stop power supply to charger B.

As described above, the in-vehicle photoelectric adapter of the present invention can operate as an in-vehicle wireless device and charge the built-in battery by inserting the balk pull type wireless device into the charging adapter, but when the engine is stopped, Automatically stops power supply after charging for a preset time 1. This product has an added function that allows the car battery to be connected to a load for a long period of time without causing over-discharge, and can be used with balk pull wireless devices such as car radio telephones that will become membrane-based in the future.
The practical effect of using it as a charging adapter is quite impressive.

[Brief explanation of the drawing]

The figure is an electrical wiring diagram of an in-vehicle photoelectric adapter according to an embodiment of the present invention. BM...Main battery, BP...Sub battery, I.
・・・Photoden ADAF sound 18, SK ・・・Enzygi, A...Timer sound b0

Claims (1)

[Claims] A main battery installed in a car and charged via a generator when the engine is operated, a charging adapter that photoelectrically charges a sub-battery built into the portable radio device by the output of the main battery, and linked to an engine key, Said engine key-1
An in-vehicle charging device comprising: a timer for operating the charger for a certain period of time after being turned off to continue charging the auxiliary battery from the main battery.