JPS5846595A - Room lamp controller 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 a control device for controlling an interior lamp for an automobile, and more particularly to a control device for soft turning on and off when turning on and off a vehicle.

Generally, in automobile room lamps, the switch is ON.
At the same time, the lamp is turned on momentarily.As a result, a rush current several times the rated current flows through the bulb at the same time as the switch is turned on, which is a common cause of filament breakage.

In addition, if the battery is temporarily overloaded, it will be severely depleted. Also, the time that elapses after the switch is turned off (
Some car interior lamps are equipped with so-called time-lag turn-off circuits that keep the lights on for a few seconds (about a few seconds) and then turn them off. In order to maintain the same brightness as 0, the time lag start of turning off is unknown.
I wonder if the lights are on while the time lag lights off is activated. It was not possible to tell whether Tsuchi had forgotten to turn off the light or not, which caused inconveniences such as having to wait until confirmation that the light had been turned off. This is because if you forget to turn off the switch, the battery will run out. moreover,
It was also not possible to set the desired brightness using manual dimming.

The present invention was developed in consideration of the above-mentioned circumstances, and it greatly suppresses the rush car left that occurs when the switch is turned on, prevents filament breakage and significant battery consumption that occur when the switch is turned on, and also OFF
An object of the present invention is to provide an automobile room lamp control device that can clearly determine whether the light is turned off with a time lag when the light is turned off, and can also set the brightness to any desired brightness by manual dimming.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of an automobile room lamp control device according to the present invention, and B and T in the figure represent batteries. A diode DI for preventing reverse power connection is connected to the batteries B and TK. The filter circuit 1 connected to this diode DIK includes a capacitor c1e e C1l and a resistor R.
1? The constant voltage circuit 2 connected to this filter circuit IK is composed of a transistor Trl, a resistor R1, and an i-voltage diode ZDI. In addition, C- is a capacitor for high frequency noise absorption, C- is a capacitor for low frequency noise absorption, and 03 is a side wave oscillation circuit, which includes two IC operational amplifiers.
, IC? Connecting point between resistors R1 and R14 is I.
C, and connect the output side to the resistor R and R.
Connect to the connection point with 11, and connect to the resistor Rss of all IC-.

Furthermore, connect the resistor R1 to the - terminal of the IC-, and connect those connection points to the IC through the capacitor C and the resistor R1m.
The output side of 0IC-, which is connected to the power of the comparator IC- and the resistor Itts, is connected to the connection point between the capacitor C and the resistor Itts, and is also connected to the power of the comparators IC and ICI, which will be described later. Connect via. By the way, both the IC book and ICI company are IC operational amplifiers.

4 is a positive side wave generation circuit, which is an IC operational amplifier,
, a resistor R- connected to the ten-man power, and a condenser CI connected to the connection point between the output side and the two-man power,
And the output side is connected to a comparator IC via a resistor R11i,
Connect to the power of ten people. Here, resistance value R15=Rts. Furthermore, lines from batteries B and T are connected to the ICs. I mean, batch! The resistor R1 connected from jB and T through the reverse connection prevention diode DI N filter circuit 1, constant voltage circuit 2, and noise absorbing capacitors C and C@ is the capacitor ci l ex
, a filter circuit 5 consisting of a resistor R2, and a polarity inversion circuit IC.
, a resistor Rs and a diode D1 are connected, and the diode D1 is connected to the IC, and the filter circuit 5 is a room lamp switch connected to the connection point between this and the resistor R. This absorbs the chattering of S'%vl. Here, the switch SWIK has a series circuit of switches SW and SWa connected in parallel.

7 is a negative side wave generation circuit, which is an IC operational amplifier.
, a resistor R8 connected to the human power, and a capacitor tCt also connected between the human power and the output side, and a resistor R5 connected to the human power of the ICs.

A trigger generation circuit 6 is connected thereto. Then, on page 6, the output of this side wave generation circuit 7 is connected to the comparator IC 16 via the resistor all ◇Here, IC-
In addition, the auto-reset circuit 8 is connected to the resistor R.
, and diode D! Here the resistance value Rss = Rsq.

The output sides of the comparators IC and IC1 are connected to the input of the OR circuit IC,l via resistors R1- and R1, respectively, and the output side of the OR circuit IC11 is connected to one side of the Φ circuit IC1. connected to the input of The output side of this circuit IC1m is connected to the driver transistor Tr through a resistor R24. The collector of this driver transistor Tr is connected via a resistor gas to the base of a transistor Trl, which is a semiconductor switch whose emitter is connected to the connection point between the diode Ds and the filter circuit 1 and whose collector is connected to the room lamp L. Connected.

9 is a manual dimming circuit, variable resistor VRs and resistor R11sR
11 and ICII. Here, the variable resistor VRI is connected to the resistor R1-, and is connected to the power of the IC1 through its movable terminal wire resistor 8.

The resistor Rgg is connected between the output side of the IC and the -manual power of the IC1, and the output side of the I-3 is connected to the other input of the ICIm via the resistor R1s. be.

Next, the operation of such a device will be briefly explained.

First, in the illustrated state, patch! When jB, Tt- is connected to Hf, power is supplied to the constant voltage circuit 2 through the filter circuit 1 through the power supply reverse connection prevention diode D-, and the constant voltage circuit 2 is activated and a constant voltage is applied to each IC1. ~IC1, is applied. At this time, the trigger generation circuit 6 operates, activates the negative side wave generation circuit 7, and outputs i'H', which may turn on the room lamp L. A temporary reset is applied through the limiting resistor R7s and the inflow prevention diode D1 of the resistor R1 so that the negative side wave generating circuit 7 does not count 1H'. Since the electric charge of the capacitor c4 is zero at the time when the operating line batteries B and T of the auto-contest set circuit 8 are connected, the voltage is directly applied to the input side of the IC 40. However, this operation ends as soon as the capacitor tc4 is fully charged. At this time, when the output of IC4 becomes %H', 1s
fl t tIiCa a Determined by the time constant of R- and the threshold voltage vTH of IC4, t = '4
"Rs 'n (*) (vDD: output voltage of constant voltage circuit 2), the output of the IC outputs a signal as shown in Figure 2. However, this t is different from the time constant of C1e R4. It will not appear unless it is large enough.

Furthermore, when batteries B and T are connected, the side wave oscillation circuit 3 is activated at the same time. The operation of this side wave oscillation circuit 3 is 1. When power (vDD) is supplied, current flows through the resistor Rss to the IC terminal, and the IC? At the same time, current flows through the resistor R1 to the IC's output, making it the output of Ic's t%LI.

When the output of IC becomes -1, a current flows through resistor Rn to the power of Ice, and after a short time t=C...R11 due to the time constant of R11 and C, capacitor c6 completes charging, and the output of ■CI is equal to the power supply voltage. I.C.

Due to the output of R11, a current flows through the resistor R11 to the -power of IC, and when I>I +I, the output power of IC becomes 1L#. When the output of the IC reaches 1LI, the
□Page 9〉I Therefore, the output of ICs becomes 1' and R1
1L, but since capacitor C6 is fully charged, IC
The output of - does not become zero immediately, and starts discharging at the current "Rt o determined by the resistor R1 (l), and RIG r
Time formed by the time constant of C4 tζC6・RloWk K
C@ti is completely discharged and the output of IC becomes 1L#. As the output of IC, decreases, the current flowing through resistor R1 decreases, and when IRu < R□, I
C? The output of remains at q″H1.

By repeating the above steps, the output of the ICs outputs a side wave as shown in FIG. However, here, C...RIG
> Set as C@・R11.

Furthermore, when batteries B and T are connected, the manual dimming circuit 9 is activated at the same time. The operation of this manual dimming circuit 9 is such that when power (voD) is supplied, the output voltage divided by the variable resistor VR1 is converted into a current called "IRH" by the resistor R11, and is input to the power of the ICtt. .lR1□
〉I) According to Lag, the output of ICtt becomes 1H', and when IR□'< lR12, the output of ICItt becomes 1L.
0 becomes 1. This situation is shown in FIG.

In the operating line shown on page 10 after connecting other batteries B and T, the power supply (vDD) is input to the waveform shaping IC, IC, through the resistors R, R1, so these outputs are both It's 1H'. First, to explain from the ci side, since the output of IC1 is %H#, the current IR6 flowing through the discharge prevention diode D via current limiting resistor Ra # R4 is set as resistance value Rs < Rs. 'Ra>IRv, and -Ic11 output cover 1Ll. On the other hand, even if the output of the IC is 1H, the input of the IC is grounded through R4 because the C8 charge is completed. Therefore, the output of IC,' becomes SL'. As a result, “Ri
The output of LIC-, which is Rs, is also 1L1. Therefore, the current of comparator Ice e ICl0 is IRts = IR+a=O. Also,
IC・* ICl0's single power output is always IC・
Resistance Rts e R1? (D-
'l''I )I ,I )I becomes IC
,.

The outputs of R;s R111Rty Rts ICl are both 1'. The result is the OR circuit ICI input through the current-side limiting resistor Rts #R1.

- output is also 1L'. The output %L# of IC1 and the output of ICu (table output as shown in Fig. 4) are input to the input of the AND circuit ICH through the current limiting resistor R21. H
If # is not input, the output will not be ')l', so the output of IC1 in this case will be 1L', driver transistor Trl, switch transistor Tr.
I also doesn't work, and the room lamp L doesn't light up.

Next, turn on the room lamp switch SWI in the car.
The operation when N is selected will be explained. When the room lamp switch SW is turned on, the waveform shaping IC1 passes through the filter circuit 5 that absorbs the chattering of the switch SW1.
t The input of ICI becomes 1Ll. As a result ■Self I
The outputs of both ICs become LI. When IC1 becomes SLI, IRs〈IR@ and positive side wave generation circuit 4 (
The output of ICs) is about to become ':H'. However, at this point, the charge of the L capacitor CsB is in the - state, so the output of the IC does not immediately become 1Hz, and Cs * R
After Cs is gradually charged over a period of time t # C3-R@, which is determined by the time constant of e, it becomes a complete 1H1. The situation is K as shown in Figure 6, and since this signal is supplied to the power of Ice through the resistor R1g, the output of CS is the output voltage of IC8 as shown in Figure 6).
1Hl is output when the output voltage is IC-, and 1Ll is output when the output voltage is IC11 (IC-).

However, in this case, the resistance value R111=R1-.

The output signal shown in FIG.
is input. On the other hand, even if the output of ICI becomes 1LI, capacitor C1 is only discharged via the output of IC, so the output of capacitor Cs, that is, the input of ICs, remains at SLI, which is the same as in the static state. Therefore, is there a negative sidewave generation circuit? The current of ten human power of (IC,) is also I
R,=o remains. Well, IC.

Since current flows through the resistor R$ to the human power, I
Re >"Rs is maintained, and the output of IC remains at 1L'. Therefore, the output voltage of IC, (the output voltage of IC,!', and the output of let is 1L'. However,
In this case, Itty = Rts. -'This I
The output signal of CI is passed through the resistor RIO to ICI.

is input. Since IC5s is an OR circuit, when a 1# signal is input to one input, its output also becomes 1H1. Therefore, even if the output of ICI is 1LI, the ICρ output is as shown in FIG. 6, so ICI.

The output of is also similar to that shown in FIG. This output is ICU
input into one input of the . Further, a signal as shown in FIG. 4 is always input to the other input of Ic1s.

Since IC1 is an AND circuit, its output is 1Hl only when both inputs are 1H'. Therefore, ICI
The output of I becomes K as shown in FIG. This output is passed through the cypace resistor R14 to the transistor Tr! is tri-typed, and the transistor Tr is connected through the current limiting resistor Rx5t.
The room lamp L is turned on when the switch I is operated, and the room lamp L gradually becomes brighter, then reaches a certain brightness after a certain period of time, and maintains this brightness thereafter. As mentioned above, when the switch SWI is turned ON L, the light gradually becomes brighter, which is called soft lighting.

Next, the operation when the switch SWs is turned off from the on state will be described. First, when the switch SW is turned on, power (vDD) is supplied to the input side of ICI #Ice through the resistor R1 and through the filter circuit 5.

That is, the %H' signal is input. As a result, I.C.

# Both outputs of ICs become 1H'. The output of ICI is 1H1K; b ToRs <・Rs K j J)
IB, > IR, and the xcao output is Rs *
After a short time t'''iCs-Rg due to the time constant of Cs, it becomes %L1, and the output of IC- also becomes SLI.On the other hand,
IC, is %H'K1. Then, the time t=-C during which the capacitor c8 is reversed from the state of zero charge to the charged state
-・R4tn(F) (yTH: Threshold voltage of ICa) %HI signal is supplied to the input of IC. The situation is similar to that shown in Figure 2. t=-C,・R,1
After n(PL) has elapsed, charging of the capacitor CI is completed, so that the input voltage of the IC is grounded through the resistor R4 and becomes 1L1, and its output becomes 1L'. In this way, the trigger generation circuit 6 converts the input signal from 1L'→%H' constant or 1H1→1L# constant signal to %L1→1HI→%L#-
i or converted into a one-pulse signal of 1H#→1L'→1H'.

While the ICI output K IH# signal is being output, the current IRs flowing through the resistor R+t is set as resistance value Rs < Rs, so IRi>IRe, and the output of s Ice is short due to the time constant of R1*ct. Capacitor C7 is fully charged in time, and its output becomes 1H1◇Tak
In this case, Cm @R4> C? e Set it as R5. The output of the circuit Cs becomes IRs<IR4 when t=~, and the output of the negative side wave generating circuit IC tends to become 1Ll. However, at this point, capacitor C? Since is fully charged, the output of ICS does not become 1LI immediately, but C? e
After being gradually discharged for a period of time tζCy·R8 determined by the time constant of R8, it becomes completely 1L'. The situation is shown in FIG. This signal is supplied to ZCI (l) through resistor gts. Also, resistor 1'L
Through ty, a signal as shown in FIG. 3 is always sent to IC1,
- Since the output of ICl0 is supplied to the 9th
As shown in the figure, when the output voltage of ICI is 1Hl, the output voltage of IC < XC@
1L' is output when the output voltage is . However, in this case, the resistance value RH=R11.

The output signal of IC1o shown in FIG. 9 is supplied to IC1tK through resistor R1. Therefore, the signal of IC, is 1L
Since the output of the IC 5a outputs the signals shown in FIG. 9 even if #, the output signal of the IC 11 to which these signals are input also becomes the same as the signal shown in FIG. This output signal is input to the input of ICIm. Also, ICII
The other input always receives a signal as shown in Figure 4.
It is turned on and off. Since it is an IC5s'ri AND circuit, its output is 1 only when both inputs are 1HI.
Since it outputs H', the output signal of IC1 becomes as shown in FIG. Based on this output signal, the second register Tr!
is driven, the transistor Tr$ is switched, and the room lamp L is turned on. Since the room lamp L is turned on, the room lamp L gradually becomes dark, and after a certain period of time, it is completely turned off. As mentioned above, switch SWt t
The process of gradually dimming the lights after turning them off is called soft-off.

In FIG. 1, swl is a switch installed at the same location as the lamp switch sw1, and is usually referred to as a lamp door switch. SWI is a door switch attached to the door of an automobile, and the switches SW and K are connected in series. Therefore, if you want to turn off the light when the door is closed, set the switch lever position of the room lamp switch SW1 to OFF - + ON to turn it on softly, and then turn it ON → OFF"F.
The light turns off softly. In addition, if you want to turn the light on and off by opening and closing the door, set the switch lever position to DOOR, and when you turn the door from close to open, the light will turn on softly, and when you turn the door from open to close, it will turn off softly.

Furthermore, in the lighting state, if you want to adjust the brightness to a desired level, you can set the manual dimming lever position connected to the movable terminal of the variable resistor VR1 of the manual dimming circuit 9 to the desired position.

As described above, the device of the present invention turns on the light softly when the switch is turned on, and turns off the light softly when it is turned off, and the brightness can be adjusted manually while the light is turned on. It greatly suppresses the rush current that occurs, preventing filament breakage and significant battery consumption, and also makes it possible to clearly identify the time lag when the switch is turned off.In addition, manual dimming allows you to turn off the light at any time. It also has the advantage of being able to be set to Moreover, in particular, by performing the soft light-off, even if the door is closed, the room lamp is immediately turned off, so there is an effect that it becomes easier to lock the door.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an automobile interior lamp control device according to the present invention, and FIGS. 2 to 1θ are diagrams showing signal waveforms of each circuit of the present invention device shown in FIG. 1, respectively. Figure 2 shows the output waveform of the auto-reset circuit relative to the power supply waveform, Figure 3 shows the output waveform of the side wave oscillation circuit, Figure 4 shows the input/output waveform of the manual dimming circuit, and Figure 5 shows the output waveform of the manual dimming circuit. is the output waveform diagram of the positive side wave generation circuit when the switch is 08, Figure 6 is the input/output waveform diagram of the comparator after the switch is turned on, and Figure 7 is the melon circuit after the switch is turned on when manual dimming is set in the middle. Input/output waveform diagram, Figure 8 shows switch OFF.
Output wave of the negative side wave generation circuit at F time 5 Figure - 〇' is the input/output waveform diagram of the damper after the switch is turned off, and Figure 10 is the AND after the switch is turned off when manual dimming is set in the middle. FIG. 3 is an input/output waveform diagram of the circuit. 2... Constant voltage circuit, 3... Side wave oscillation circuit, 4...
Positive side wave generation circuit, 6...Trigger generation circuit, 7...
Negative side wave generation circuit, 9... manual dimming circuit, SWl.
・・Switch, IC6m ICH-・Comparator, I
C5t -OR circuit, ICIm...AND circuit, Tr
I...Transistor (semiconductor switch), L...Room lamp, B, T...Battery. Patent Applicant: Ichikoh Industries Co., Ltd. Agent: Patent Attorney: Tadashi Akimoto, Figure 2, Time 3F! J ・ Time use Figure 4 - Lock gate Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] A constant voltage circuit and a switch connected to a power source; 1 a side wave oscillation circuit connected to the constant voltage circuit and outputting a sawtooth signal; and when the switch is turned on, the output voltage is set to a constant value. connected to the switch via a positive sidewave generating circuit that gradually increases up to
FK) a negative sidewave generation circuit whose output voltage gradually decreases; a comparator to which output signals of the sidewave oscillation circuit, the positive sidewave generation circuit, and the negative sidewave generation circuit are input; and the comparator. The room lamp includes a manual dimming circuit provided between the side wave oscillation circuit and the AND circuit, and a manual dimming circuit provided between the side wave oscillation circuit and the AND circuit. When the switch is turned on, the illuminance gradually increases to a certain value and then the switch is turned off.
Automotive room lamp control value 2, characterized in that the illuminance gradually decreases from K, and that manual dimming is possible when turned on.