JPS5811627Y2 - Transistor type turn signal. Hazard dual purpose flashier - Google Patents

Description

[Detailed description of the invention] This invention is a transistor-type turn signal that improves a capacitor-type flasher that can be used as both a turn signal and a hazard flasher by using the charging and discharging of a capacitor.
This relates to a hazard flasher.

The hot wire or heat ribbon type flashers that have been commonly used in the past have characteristics such as the number of flashes determined by the current flowing through the hot wire. In the case of a hazard that flashes a light, the current doubles, so parts and adjustment specifications are different, and a single flasher cannot be used universally.

The purpose of the present invention is to utilize the charging and discharging of a capacitor, and further reduce the capacitance of the capacitor by interposing a transistor, thereby creating a turn signal that eliminates the above-mentioned drawbacks.
To provide a flasher which can also be used as a hazard, is an instant lighting type which is important for traffic safety, and has a method that can make the flashing speed fast to identify the disconnection when one light is disconnected.

An example of implementing the present invention will be described below with reference to the drawings.

Fig. 1 shows the basic circuit of the flasher according to the present invention, and Fig. 2 is a circuit diagram when the circuit is provided with a light disconnection indicating circuit. In the figure, P2 is a contact of a normally open reed switch.
It is activated and closed by coil L2.

P□ is a normally open contact that is activated and closed when current flows through the relay coil L1.

L2 is a current coil for operating the contact P2, and this coil L2 is adjusted so that the contact P2 will not be operated by the current when the turn signal lamp 4 is disconnected.

C□ is a capacitor that is the basis of the blinking operation in the flasher of the present invention, and the transistor Tr□ is turned on by the charging/discharging waveform of the capacitor C1.

Turn off.

R1 is a positive bias resistance of the transistor Trl when the turn signal switch 5 is turned on, and R2 is a collector resistance of the transistor Tr2, both of which are resistances for obtaining the discharge or charging time of the capacitor C0.

2 is a battery, 3 is an ignition switch, 4 is a signal lamp, 5 is a turn signal switch, and 6 is a hazard switch.

In the present invention, the transistor Tr□ has an emitter connected to the battery 2 and the contact P1, and a collector connected to the relay coil L1.
and the base to the capacitor C11 side via the diode D, respectively, and intervene in the above-mentioned circuit to excite and demagnetize the relay coil L0.

The emitter of the transistor Tr2 is connected to the battery 2, the collector is connected between the capacitor C1 (') O side and the resistor R2, and the base is connected between the collector of the transistor Tr and the relay coil L1 via the resistor R2. intervened and set the transistor Tr to 0Nj.
Turn it off.

Note that in the case shown in FIG. 2, the resistor R8 and resistors R6jR7 that are parallel to each other are connected to the base of the transistor Tr2, and these are collectively connected to the transistor Tr2.
The operating point is determined.

A contact P2 of a reed switch is connected in series to the resistor R6.

When the contact P2 opens, the base potential of the transistor Trz decreases, and the charging voltage of the capacitor C1 through which the transistor Tr passes changes, thereby shortening the blinking time.

D2 is a diode arranged in parallel with the relay coil L□, and absorbs the back electromotive force of the relay coil L1.

Further, C2 is a stabilizing capacitor for the transistor Trl.

The blinking operation of the turn signal will be explained below with reference to Figure 1. When the ignition switch 3 is turned on,
When the turn signal switch 5 is turned to the right or left, it operates as follows.

Note that when the turn signal switch is OFF, the transistor Tr2 is positively biased and turned ON via the relay coil L□ - resistor R8, so there is approximately 0 between the positions ■ and ■.
V, and the transistor Tr□ is turned off.

(1) When the switches 3 and 5 are turned on, the emitter-base of the transistor Tr□ is positively biased through the signal lamp 4 and the resistor R0, and the transistor Tr is turned on.
Then, the relay coil L1 is energized and the contact P0 is turned ON.

Thus, electricity is supplied from the battery 2 through the contact P0, and the signal lamp 4 and pilot lamp (not shown) are activated.

) lights up. (11) When the transistor Trt is turned on, the potential across the resistor R8 becomes OV, so the transistor Tr2 is turned off.

Therefore, even if the potential between positions 0 and ■ becomes the same, the charging current of capacitor C flows through the path shown by the solid arrow between the terminal and base of transistor Tr1, so transistor Tr1 continues ONL, and relay coil L1 and holds contact P1.

(111) Tr due to the charging current I□ of this capacitor C
1 ON time (i.e., lamp 40 lighting time).

) is constant with the time constant of capacitor C□×charging resistor R2,
When the capacitor C1 is charged to a constant potential, the transistor Tr□ is turned off.

By turning off the transistor Tr□, the relay coil L
1 is turned off.

...Lamp 4 goes out. +1V) When the relay coil L□ turns off, the transistor Tr2 turns off the coil L□-
It is positively biased through resistor R3 and turned ON.

Therefore, as shown by the dotted arrow, capacitor C0 → resistor R1 → turn signal switch 5 → signal lamp 4 →
The discharge current I2 of the capacitor C flows through the path of the battery 2 → ignition switch 3 → transistor Tr → capacitor C1, but since the potential of this capacitor C is reverse biased for the transistor Tr1,
The transistor Tr1 is reliably turned off.

...Lamp 4 goes out. (v) Here, the transistor T rl is reverse biased by the capacitor C□,
Lamp 4 - Positively biased through resistor R1.

Therefore, when the discharge of the capacitor C□ progresses and the current I2 is switched to the current ■, the transistor Trt turns ON and returns to the state of 11) above.

After that, repeat steps 11) to ■) and turn the turn signal switch 5.
During the OM period, the signal lamp 4 blinks regularly.

As can be seen from the above operation, the intermittent counting of the signal lamp 4 is performed by charging and discharging the independent transistor Tr1sTr2 coil L and capacitor C□ circuits, which are unrelated to the load current to the signal lamp 4. It can be used as both a turn signal and a hazard flasher.

That is, when the hazard switch 6 is turned on, the hazard flashers operate in the same manner as above, and the lamp 4 (
all four) flash.

Next, the abnormal high-speed switching off operation when one lamp is disconnected will be explained with reference to FIG. 2, which shows the above basic circuit developed into a practical circuit.

(1) In the case of the above-mentioned normal blinking operation, in this circuit, the reed switch contact P2 is turned ON by the coil L2 connected in series with the signal lamp 4, so that
The base resistance of the transistor Tr2 is a resistance R6 added to R3 and R7 via the contact P2.

Let Vo be the potential at this time.

In this state, the normal blinking operation described above is performed.

(il) Now, if one of the two turn signal lights 4 is disconnected, the lamp 41 is adjusted so that it does not attract the contact P2 of the coil L2 carry switch.
The circuit of the resistor R8 will be opened.

Therefore, the base resistance of the transistor Tr2 is the resistance R3.
As a result, the operating point of the transistor Tr2 is shifted, and the potential of the transistor Tr2 changes to a value v2 smaller than Vl in 1) above.

Thus, the saturation level of the charging voltage of the capacitor C□ changes to the value of the potential v2, and the ON-
It turns off quickly, causing lamp 4 to blink at high speed.

Note that the bias of the base of the transistor Tr2 is set by the resistor R.
4 and R5, the voltage across the capacitor C□ is kept constant by operating in an unsaturated state (class A operation).

D2 is a diode.

As detailed above, the present invention is a dual-purpose flasher, which reduces the number of product models and has the economical effect of enabling mass production, as well as being able to easily provide a one-light disconnection alarm by flashing at an abnormally high speed. Dogs also have an effect on traffic safety.

Furthermore, when only a capacitor is used, the capacitor is charged and discharged directly to the operating coil for contact opening/closing, whereas in the present invention, charging and discharging is performed via two transistors, so the withstand voltage and capacity of the capacitor are small. It is convenient to use, and quality stability can be achieved.

Furthermore, in the present invention, two transistors are used to suppress positive feedback, so the voltage waveform applied to relay L1 becomes a square wave, and therefore the operating voltage and release voltage specific to relay L can be ignored. , there is no need to adjust the relay L□, and there is also the effect that a high-quality flash with a stable number of blinks can be obtained at low cost.

The high-speed blinking warning when the lamp is disconnected can be easily provided by dropping out part of the base resistance of the -power transistor operating point.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a basic circuit diagram of the present invention, and FIG. 2 is a circuit diagram showing an L lamp disconnection indication. In the above diagram, each symbol indicates the following elements. Tr s Tr2...Transistor, C□a
c2... Capacitor, L... Relay coil, L2... Coil, Pl, P2...
...Contact, R...Resistor, D...Diode, 2...Battery, 3...Ignition switch, 4...Signal lamp ,
5...Turn signal switch, 6...
・Hazard switch.

Claims (1)

[Scope of utility model registration request] A plurality of signal lamps 4, a contact P connected in series to the lamps 4 via a turn signal switch 5 and a hazard switch 6, a relay coil L1 that opens and closes the contact P1, and a relay coil L1 connected in series to the relay coil L1. the transistor Tr□, the switch 5 or 6 interposed between the base of the transistor Tr1 and the switches 5 and 6;
a resistor R□ that applies a positive bias to the base of the transistor Tr□ when the transistor Tr□ is ON; a capacitor C1 connected to the base of the transistor Tr1 to control ON/OFF of the transistor Tr1 and blink the lamp 4; A transistor Tr2 that controls the charging potential, a base of the transistor Tr2, and the transistor Tr□
and a resistor R3 interposed between the relay coil L□ and the connection point of the relay coil L□.