CN2110307U

CN2110307U - Automatic protector for automobile electronic equipment

Info

Publication number: CN2110307U
Application number: CN 92213085
Authority: CN
Inventors: 李春生
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-01-17
Filing date: 1992-01-17
Publication date: 1992-07-15

Abstract

The utility model relates to an automatic protector for automobile electronic equipment, which is used for preventing automobile electronic equipment, such as radio-receiver recorders, TV sets, etc. from being damaged because of over-voltage of the power supply, comprising mainly an electronic switch, a double-knife double-throw dc relay, a three-terminal voltage stabilizer, an LED, etc. The power supply voltage is normally only equal to a conducting wire, when the value of the power supply voltage is higher than a normal value, the three-terminal voltage stabilizer is automatically connected with the circuit to ensure the normal work of electric equipment, and light is emitted to make alarm. The utility model has the advantages of convenient operation, high reliability, low cost, wide application range, etc. and is an ideal protective device of automobile electric equipment.

Description

Automatic protector for automobile electronic equipment

The utility model belongs to the field of vehicle auxiliary equipment power supply, is used to protect the not too high and device that damages of reason supply voltage of electronic equipments such as radio-cassette player and television set.

At present, radio-cassette player extensively is housed on the automobile, what have also is equipped with electronic equipments such as television set, general electrical equipment such as these electronic equipments and car light uses same storage battery to make power supply, in the process of moving, by generator to charge in batteries, during as the line loose contact that makes storage battery and generator because of certain reason even open circuit, power consumption equipment will directly use the high power supply of the big voltage of ripple of generator output because of the voltage regulation filtering effect that loses storage battery, and this power supply is little for the harm of general electrical equipment such as car light.But will produce serious harm for electronic equipments such as radio-cassette player and television sets, even cause damage.

The purpose of this utility model is to be a kind of automatic protectors of electronic device design such as the radio-cassette player of automobile use and television set.

Technical measures of the present utility model are: be connected in series an automatic protector between power line and electronic equipments such as radio-cassette player, television set; this protector just often only is equivalent to a lead at battery circuit; when battery circuit comes in contact bad or fault such as open circuit and when causing supply voltage too high; voltage stabilizing circuit in the protector is place in circuit work automatically just; and can report to the police by light-emitting diode, get rid of until fault.Its basic circuit mainly is made up of electronic switch, dpdt double-pole double-throw (DPDT) direct current relay J1 and three terminal regulator G3, and J1 is connected on the output of electronic switch as the load of electronic switch.Two normally-closed contacts 2 among two groups of switch JK1 on the J1 and the JK2 directly are connected with 5.Two moving contacts 1 and 4 meet power end U respectively _{Go into}With load end U _{Go out}Two normally opened

contacts

3 and 6 connect input 1 and the output 2 of three terminal regulator G3 respectively, the 3rd pin ground connection of G3, electronic switch can be formed by connecting by discrete component or integrated circuit etc., the utility model adopts discrete component, and physical circuit is made up of two triode G1 and G2 and five resistance R 1～R5, and the G1 base stage is connected with the serial connection point of sample resistance R1 and R2, the G2 base stage is connected with the G1 emitter, the G2 collector electrode with meet power end U after relay J 1 is connected _{Go into}, R3 is connected on G1 collector electrode and U _{Go into}Between.R4 is connected between G1 emitter and the ground, and R5 is connected between G2 emitter and the ground, and in order in time to find fault, light-emitting diode D1 in parallel at the R5 two ends is in order to reduce ripple coefficient, at U _{Go into}, U _{Go out}With input/output terminal difference filter capacitor C1 in parallel, C2, C3, the C4 of G3, shunt resistance R6 is connected between the input and output of G3.

Accompanying drawing 1 is an external form schematic diagram of the present utility model;

Accompanying drawing 2 is basic circuit diagrams of the present utility model;

Accompanying drawing 3 is practical circuits of the present utility model.

Be further described as follows in conjunction with the accompanying drawings:

Referring to accompanying drawing 1, complete machine only has two lead-out wires, and one is U _{Go into}Connect power supply, another root is U _{Go out}Connect electronic equipments such as radio-cassette player, light-emitting diode D1 is contained on the shell, and shell is made of metal.Outer casing bottom has installing hole, is fixed on screw on the metal frame of automobile to use, and other part is all cased, the connection of its circuit such as Fig. 2, shown in Figure 3, and the ground wire in the circuit is metal shell.G1G2 among the figure and R1～R5 constitutes electronic switch, and G1 can select low-power transistor for use, as 3DG4,3DK3,9013 etc.Pliotron such as 3DG7,3DG12 during G2 can select for use, 3DK4,9013 etc., J1 is the load of electronic switch, can select 8099 for use, the dpdt double-pole double-throw (DPDT) direct current relay of models such as JRX-13, JQX-13, G3 can select the three terminal regulator of the big electric current output of models such as IM7812, CW7812, μ A7812 for use.Light-emitting diode D1 can be connected in parallel on the R5 two ends, also can with 1 pin or 2 pin that are attempted by G3 after resistance is connected, the R6 among Fig. 3 mainly plays shunting action.D2 is protection G2, and C5 prevents the J1 misoperation.When supply voltage just often, G1 and G2 end, J1 is failure to actuate, JK1 and JK2 are in the position shown in the figure, at this moment, protector only is equivalent to a lead; When voltage was higher than normal value, the voltage on the sample resistance R2 raise, and the G1 emitter voltage is raise, and G2 will be by leading the luminous warning of D1 by becoming.The J1 adhesive, the moving contact 1 of JK1 contacts with normally opened contact 3, and the moving contact 4 of JK2 contacts with normally opened contact 6, with the G3 place in circuit, makes U _{Go out}End still can be exported normal voltage, has protected electronic equipment can not burn out because of supply voltage raises.

The utlity model has easy to usely, reasonable in design, switching speed is fast, and power output is big, and static power consumption electric current is little, the reliability height, and the advantage such as applied widely is a desirable automatic protector of auto electronic equipments.

Claims

1, is used to protect the electronic equipment too high and vehicle electronics automatic protector that damages of reason supply voltage not on the automobile; it is characterized in that this automatic protector is made up of electronic switch, dpdt double-pole double-throw (DPDT) direct current relay J1 and three terminal regulator G3; its annexation is: J1 is connected on the output of electronic switch; two normally-closed contacts 2 among two groups of switch JK1 on the J1 and the JK2 directly are connected with 5, and two moving contacts 1 and 4 meet power end U respectively _{Go into}With load end U _{Go out}, two normally opened contacts 3 and 6 connect input 1 and the output 2 of three terminal regulator G3, the 3 pin ground connection of G3 respectively.

2, vehicle electronics automatic protector as claimed in claim 1; it is characterized in that electronic switch is made up of two triode G1, G2 and five R1～R5; wherein the G1 base stage is connected with the serial connection point of sample resistance R1 and R2; the G2 base stage is connected with the G1 emitter, the G2 collector electrode with meet power end U after relay J 1 is connected _{Go into}, R3 is connected on G1 collector electrode and U _{Go into}Between, R4 is connected between G1 emitter and the ground, and R5 is connected between G2 emitter and the ground.

3, vehicle electronics automatic protector as claimed in claim 1 or 2 is characterized in that R5 two ends light-emitting diode D1 in parallel, at U _{Go into}, U _{Go out}With input/output terminal difference filter circuit C1 in parallel, C2, C3, the C4 of G3, shunt resistance R6 is connected between the input and output of G3.