CN2134320Y

CN2134320Y - Automotive headlight monitor

Info

Publication number: CN2134320Y
Application number: CN 92239029
Authority: CN
Inventors: 张万益
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-06
Filing date: 1992-11-06
Publication date: 1993-05-26
Anticipated expiration: 2002-11-06

Abstract

The utility model relates to an automotive headlight monitor, comprising a square wave generator, a headlight power supply circuit, a rectifier, a voltage comparator and an acoustic-optic alarm circuit. The headlight power supply circuit is formed by serially connecting a headlight, a control switch and a choke coil winding. The square wave voltage generated by the square wave generator is added on the headlight in the headlight power supply circuit. When filaments are connected, the power supply causes the headlight to illuminate via a choke coil, the output voltage of the rectifier is lower but the voltage comparator outputs the high potential so that the acoustic-optic alarm circuit does not work. After the headlight is switched off, the output voltage of the rectifier is enlarged but the voltage comparator outputs the low potential so that the acoustic-optic alarm circuit dispatches the light and the alarm sound.

Description

Automotive headlight monitor

The utility model relates to the monitoring device of car lighting signal, particularly the automotive lamp monitor unit.

In recent years, people have designed the automotive lamp monitoring device in order to solve the real-time monitoring problem of automotive lamp.This monitoring device comprises filament feed circuit and sound warning circuit, and it mainly is made up of discrete elements such as aerotrons.Monitored filament is connected in the transistor base and collector loop in the filament feed circuit, is connected to master cock and silicon diode in its base stage and emitter circuit.After master cock is connected, if when filament is communicated with, the aerotron conducting, power supply makes it luminous by master cock and silicon diode for filament provides electric current, and the aerotron in the audible alarm circuit is in off condition, and the buzzer phone that is connected on its collecting electrode is sounding not; If filament disconnects, the aerotron in the filament feed circuit ends, the triode conducting in the audible alarm circuit, and buzzer phone sends alarm sound.Though this filament monitoring device line construction is simple, but the forward voltage drop that requires to be connected in the filament feed circuit on the silicon diode in transistor base and the emitter circuit must be greater than more than the 0.75V, just can make this aerotron be in conducting state, owing on the silicon diode certain pressure drop is arranged, make the voltage on the filament decrease, influenced lighting brightness.With country beam brightness is example, when not adding monitoring device, country beam brightness surpasses 14000 unit of illuminance, 14000 unit of illuminance are minimum acceptance value, after adding monitoring device, just reduce to below 14000 unit of illuminance, had a strong impact on the automotive lighting quality, even be judged to the illumination nonconformity by car test department, and prospective vehicle is not set out on a journey and is travelled.In addition, this monitoring device lacks the light warning function, the information that can not provide which filament to break, and the driver hears must get off behind the alarm sound and checks every bulb successively, could determine at last to use the fracture of wire bulb, and is very inconvenient.

The purpose of this utility model is to provide a kind of country beam brightness that do not influence, and can carry out the dazzle light monitoring device of sound and light of alarm simultaneously.

The utility model comprises: square-wave generator, country beam feed circuit, rectifier, voltage comparator and sound light alarming circuit.The square wave of square-wave generator output is added on the country beam in the country beam feed circuit, after rectifier takes out square-wave voltage from country beam, be input to the input end of voltage comparator, the potential change that voltage comparator produces according to the break-make of country beam is determined the height of its current potential, thereby make sound light alarming circuit work, if promptly headlight high beam filament normally is communicated with, the rectifier output voltage is lower, voltage comparator is output as high potential, and sound light alarming circuit does not send light and sound; After headlight high beam filament disconnected, the rectifier output voltage increased, and voltage comparator is output as active potential, so sound light alarming circuit sends light and alarm sound.

The country beam feed circuit are formed by master cock, choke coil winding and country beam serial connection.After master cock was connected, power supply provided electric current to make country beam luminous by the choke coil winding, because the choke coil winding D.C. resistance is very little, brightness does not have influence to country beam.

The utility model is owing to adopted square-wave generator and voltage comparator, and in the country beam circuit, inserted choke coil, therefore brightness does not have influence to country beam, has inserted illuminator simultaneously again, make this monitoring device have no progeny and can carry out sound and light alarm simultaneously at filament, the driver is very easy to use.

Concrete structure of the present utility model is provided by the following drawings and embodiment.

Fig. 1 is a functional block diagram of the present utility model;

Fig. 2 is the utility model specific embodiment electrical schematic diagram.

Referring to accompanying drawing 1, the utility model is made up of square-wave generator 1, country beam feed circuit 2, rectifier 3, voltage comparator 4, sound light alarming circuit 5.Country beam circuit 2 is by master cock K ₁, the choke coil winding L ₁, country beam ID ₁Serial connection forms.

Referring to accompanying drawing 2, with a great distance light modulation ID wherein ₁For example illustrates its principle of work.Square-wave generator 1 is by IC ₁, resistance R ₁, R ₂, R ₃, capacitor C ₁, C ₂Constitute, country beam feed circuit 2 are by country beam ID ₁, the choke coil winding L ₁, master cock K ₁Form, rectifier 3 is by C ₄, C ₆, D ₁, D ₂, R ₅Form, voltage comparator 4 is by IC ₂, resistance R ₇, R ₉Form, sound light alarming circuit 5 is by light-emitting diode I ₁, resistance R ₁₁, R ₁₃, R ₁₄, diode D ₅, D ₇, D ₈, triode V ₁, capacitor C ₁₀, C ₁₁Form with buzzer phone.The square-wave signal that square-wave generator 1 produces, its amplitude approaches power line voltage+12V, through C ₂, R ₃Be coupled to the A point in the country beam feed circuit 2, as power control switch K ₁After the connection, if country beam ID ₁Filament normally be communicated with ,+12V power supply is by the choke coil winding L ₁Flow through country beam ID ₁Make it luminous, this moment, the A point presented low resistance over the ground, and A point voltage amplitude reduces, by C ₄Be coupled to rectifier 3, it is less to obtain B point voltage to ground behind overcommutation, and is added to voltage comparator ic ₂Reverse input end because voltage comparator ic ₂Positive input voltage be R ₇, R ₉Partial pressure value, can select R ₇And R ₉Resistance, make positive input voltage greater than its reverse input end voltage, so voltage comparator ic ₂Be output as high potential, the light-emitting diode I in the sound light alarming circuit ₁End, not luminous, aerotron V ₁End, buzzer phone is sounding not; As headlight high beam filament ID ₁After the disconnection, the A point presents high resistance over the ground, and its voltage amplitude increases, and the B point voltage after rectification increases, voltage comparator ic ₂Reverse input end voltage greater than its positive input voltage, therefore, voltage comparator ic ₂Be output as active potential, light-emitting diode I ₁Conducting is also luminous, aerotron V ₁Also conducting, buzzer phone sends alarm sound.

The choke coil winding L that connects in the country beam circuit ₁Employing is about 350mm, the coiling of φ 1.0mm enamel wire, and its direct current resistance is very little, to not influence of country beam brightness.

Claims

1, a kind of dazzle light monitoring device comprises sound light alarming circuit, it is characterized in that: also comprise square-wave generator, country beam feed circuit, rectifier, voltage comparator, the output of square-wave generator is added on the country beam in the country beam feed circuit, after rectifier takes out square-wave voltage from country beam, be input to the input end of voltage ratio device, voltage comparator is determined the height of its output potential according to the potential change that the break-make of country beam produces, thereby makes sound light alarming circuit work.

2, dazzle light monitoring device according to claim 1 is characterized in that: the country beam feed circuit are formed by master cock, choke coil winding and country beam serial connection.