CN2278098Y - Multi-function car electric appliances tester - Google Patents

Abstract

The utility model relates to a multi-function tester for car electric appliances. The interior of the utility model is provided with a switch power supply and a load. The utility model can carry out the performance test on a plurality of car electric appliances of electric ignition coils, loudspeakers, flashing devices, relays, various switches, etc. The utility model has the functions of load short-circuit protection, accumulator jar constant current charging, etc., and has the advantages of high efficiency, low consumption, portability, cheap cost, etc. The utility model provides a multipurpose test tool for the overhauling of the car electric appliances. The utility model is composed of a switch power supply, an auxiliary power supply, the voltage control loop of a digital control switch power supply, an electronic oscillation ignition coil testing circuit, a loudspeaker sounding simulation sound circuit for testing loudspeakers, and a simulation load circuit which is used for the flashing device testing or the relay and various connection and disconnection.

Description

Multi-purpose vehicle(MPV) electric test instrument

The utility model belongs to a kind of electric test instrument, is exclusively used in Performance Test of Auto Electric Parts, is again a kind of high-performance direct current charger simultaneously.

In numerous patents of China, some automobile electrical appliances testing instruments are disclosed, as application number is 89218901, name is called: multi-purpose vehicle(MPV) detector patent, form by test lead, gauge outfit indicating section, tachometric survey part, make contact angular measurement part, voltage, resistance, contact mass measurement part, ignition timing measure portion, it is characterized in that: tachometric survey partly comprises signal processor, phase locked loop, temperature monostable device and rp-drive; Make contact angular measurement part comprises low-pass filter, threshold values control circuit and pulse shaping nework; Resistance, voltage and contact mass measurement part utilize resistor network to be achieved.The ignition timing measure portion comprises the pulsed drive level, links to each other controllable silicon synchronous triggering control circuit, trigger generator, dc dc converter and xenon lamp with the phase locked loop feedback control loop; Test lead comprises three common folders and an induction type sensor.Its deficiency is that the design of circuit unit function is poor with the various systems of automobile electrical appliances correspondence, and testing result is not directly perceived, and actual use is very inconvenient.

Deficiency at above-mentioned prior art, the utility model discloses a kind of multi-purpose vehicle(MPV) electric test instrument, built-in switch power supply and load, can carry out testing property to electrical apparatus for vehicle uses such as multiple electric system spark coil, loudspeaker, flasher, relay and all kinds of switches, and have functions such as load short circuits protection and storage battery constant-current charge, this testing instrument has adopted multinomial advanced technology, as the switch power of voltage-regulation on a large scale; The fictitious load that replaces the flasher bulb with power resistor; Technology such as pulsed electron igniting make that this instrument has efficiently, characteristics such as low consumption, light, cheapness, for automobile electrical appliances factory, accessory sales department and motor repair shop provide suitable multi-purpose automobile electrical appliances testing tool.

The utility model is made up of following circuit:

The switch power that can make output voltage utilize pulse length modulation principle to adjust on a large scale.One is the accessory power supply of test control panel and the power supply of switch power plate.A numerical control supply voltage switch control loop, an electronic spark coil test circuit, the loudspeaker that test horn is used on-off control circuit of ringing, a fictitious load circuit that is used for flasher test or relay and all kinds of switch on and off,

Accompanying drawing further specifies the technological scheme details by the following examples.

Fig. 1 is the switch power electrical schematic diagram;

Fig. 2 is the test control panel electrical schematic diagram;

Fig. 3 is a panel layout;

But this testing instrument is three parts such as dividing elements switch-dividing power supply, test control and state demonstration with the printed wiring board.

The half-bridge circuit that switch power is made up of the TL494 controller constitutes (Fig. 1), civil power is imported through J3, earlier by the High-frequency Interference in the C9 filtering electrical network, behind power thermistor R23 by B1, E1, E2 rectification and filtering, become the direct current about 300V, the antiphase signal of the C1 of TL494, C2 pin output pulse width 0-45%, pass through T2, T3 transformer lotus root is closed and promotes MOS-FET M1, M2 alternate conduction, through switch transformer T1 step-down, fast diode D7, the D8 of recovering does the wave filter output DC that full wave rectifier and L1, E4, E5, E6, E7 form.RS is a current sampling resistor, and when electric current reached setting value 10A, TL494 changed pulsewidth output automatically, by reducing voltage electric current is limited in 10A.The maximum characteristics of this power supply are to have added by R13, R15, N1, D3, D5 and R14, R16, N2, the shaping circuit that D4, D6 form, can make output voltage utilize pulse length modulation principle to adjust on a large scale, and in 6V, 12V, the whole voltage output range of 24V, all keep minimum fluctuation.R10, C5 among the figure, R7, C3, R6, C4, and piezoresistance R21, R22, formation absorption circuit prevent that because the T1 leakage inductance makes M1 M2 produces overvoltage when turn-offing, and R19, C6 and R20, C7 prevent D7, D8 over-voltage breakdown; R1C10 is the vibrator circuit resistance capacitance, may command oscillation frequency, E3, R5 is a soft starting circuit, and the load current that prevents to start shooting impacts, IC1 14 pin output 5V reference potential, by R3, the R4 dividing potential drop is set up the voltage comparator reference potential for the IC12 pin, when supply voltage rising or load reduction, then output voltage has trend of rising, raises through J2 input IC1 1 pin voltage by the external circuit dividing potential drop, by the IC1 internal comparator, relatively 2 pin voltages then lower output pulse width automatically, make output voltage keep constant.

The composition of test control panel and mainly can to finish function as follows:

By the accessory power supply that devices such as T1, B1, V1 are formed, be the power supply of this plate and switch power plate, civil power is through T1 step-down B1 rectification C13, C14 filtering V1 voltage stabilizing, and supply voltage VCC is controlled in output.

By the numerical control supply voltage switch control loop that IC2, IC5 form, can receive by the trigger signal of keyboard through socket J2 input, finish the switching of sample resistance resistance R19 and P1, P2, P3, to reach the order ground that changes output voltage;

By the electronic spark coil test circuit that IC1, N6 form, can finish the igniting testing experiment of spark coil; R20 R21 C12 can determine the oscillation frequency of IC1, and dutycycle.Through R22, R24 dividing potential drop, driving N 6 output square signals.

Receive the keyboard trigger signal that J2 sends here by IC4:E,, constitute the loudspeaker on-off control circuit of ringing, can make the loudspeaker energising, judge the quality of loudspeaker by sound to promote relay J C;

A fictitious load circuit that is used for flasher test or relay and all kinds of switch on and off, control IC2 when changing supply voltage by the keyboard trigger signal that J2 transmits, also controlling the state of IC6, thereby make relay J A12, JB12 or JA24, JB24 make contact, to reach the purpose of switching different flasher loads according to different voltage.Suppose that voltage is chosen as the 12V shelves, then IC2 2 pin are high level, and controlling multichannel selects then device IC5:B conducting on the one hand, and then R19 is 5V in the partial pressure value of P2; IC6 1.8 pin are high level on the other hand, work as the flasher key simultaneously and do not have closure, 3 of IC4,9 pin are high level, then IC6 2.9 pin are high level, and this moment, IC3 13 pin were low level, and IC6 drives relay J A12, JB12 adhesive with door A, C output high level B, D output low level through triode, connect the 12V load, this moment, the 24V load disconnected; With being selected in the 24V shelves by voltage, then N3, N5 drive JA24, JB24 connection, and this moment, the 12V load disconnected, and the 24V load is connected.IC3 A:B:C: be used for the driven for emitting lights diode, R1, R5, R6 are pull-up resistor.

State display part is divided into six light emitting diodes on the membrane keyboard, and wherein three are used for doing 6V 12V 24V voltage indication (connecing J2 7.8.9 pin), and three are used as flasher and loudspeaker connection indications (J2 4.5.6 pin) in addition

In Fig. 3 panel layout, 1 is the igniting indicator window, and 2 is ignition switch, and 3,4 are spark coil test terminal, 5 for loudspeaker connect post, 6,7 be power supply+,-wiring terminal, 8 is flasher load wiring post, 9 is voltage-selected switch, and 10,11 is the flasher load switch, and 12 is the loudspeaker on-off switch.13,14,15 are voltage indication light emitting diode.16,17 are flasher load indication light emitting diode, and 18 are loudspeaker break-make indication light emitting diode.

The using method of testing instrument:

Power plug is inserted power socket, open the power switch on the version of back, the power selection switch 9 on the repeated presses panel, according to light emitting diode 13,14, voltage is determined in 15 indication.When the measuring point fire coil, the terminal of coil are inserted the coil measurement terminal 3 of testing instrument, on 4, and with coil high voltage wire insertion testing instrument top jack, open ignition switch, can see three utmost point needle-dischargings this moment by the igniting indicator window, if discharge scenario is bad, fire is weak or do not strike sparks then bad for coil; When test horn the loudspeaker of testing instrument are connect post 5 and power supply ground 6 is connected to loudspeaker, press the switcher of speaker 12 on the panel, loudspeaker should normally be rung; During the flasher test B.E.L of flasher is inserted the power supply+.-. and the load terminal 6 of testing instrument respectively, 7,8, this moment two flasher light emitting diodes 12,13 should be simultaneously glittering, the state of two bulb proper functioning when simulation is turned, when a left side or the right button head pinned on the panel, the respective side load of then being pressed disconnects, luminotron tube extinguishes in order to simulate bulb damage (fault) state simultaneously, the opposite side luminotron tube should be often bright, often go out or flash rate adds piece, slow down (the fault display format that is adopted by flasher determines), if frequency is constant, then this flasher fault indication function lost efficacy; When busy relay, the relay contact terminal be connected to the power supply of testing instrument+with the flasher load end, this moment the winding wiring of relay be terminated at the power supply of testing instrument+,-, then flasher indication luminotron tube should light to show the relay adhesive normal, the break-make of all kinds of switches of in like manner available this instrument test; In addition because the switch power in this testing instrument has adopted constant current technology, available 10A electric current is the charging of 12V storage battery, method be storage battery insert power supply+-wiring terminal, selecting voltage is the 24V shelves, the storage battery charging of 60Ah 7-8 hour, the storage battery charging of 200Ah got final product in 24 hours.

Claims (1)

1, a kind of multi-purpose vehicle(MPV) electric test instrument is made up of casing that following circuit is housed and panel, and described circuit includes:

The switch power that can make output voltage utilize pulse length modulation principle to adjust on a large scale, one is the accessory power supply of test control panel and the power supply of switch power plate, a numerical control supply voltage switch control loop, an electronic spark coil test circuit, the loudspeaker on-off control circuit that test horn is used, a fictitious load circuit that is used for flasher test or relay and all kinds of switch on and off.It is characterized in that: described switch power is the current-limiting type DC source, is to be made of following circuit:

The half-bridge circuit of forming by the TL494 controller, civil power is imported through J3, by C9 filtering High-frequency Interference, behind power thermistor R23 by B1, E1, E2 rectification and filtering, become the direct current about 300V, the antiphase signal of the C1 of TL494, C2 pin output pulse width 0-45%, by the transformer coupled promotion of T2, T3 MOS_FET M1, M2 alternate conduction, through switch transformer T1 step-down, fast recover two and pipe D7, D8 do the wave filter output DC that full wave rectifier and L1, E4, E5, E6, E7 form.RS is a current sampling resistor, when electric current reaches setting value, TL494 changes pulsewidth output automatically, current limit in setting value by R13, R15, N1, D3, D5 and R14, R16, N6, D4, D6 form shaping circuit, adopt pulse length modulation principle to adjust output voltage R10, C5, R7, C3, R6, C4 and piezoresistance R21, R22 and constitute absorption circuit, prevent that the T1 leakage inductance from producing overvoltage, R19, C6 and R20, C7 constitute protective circuit, prevent D7, D8 over-voltage breakdown; R1, C10 are vibrator circuit, the may command oscillation frequency, and resistance capacitance E3, R5 are soft starting circuit, the 14 pin output 5V reference potential of IC1 by R3, R4 dividing potential drop, is set up the voltage comparator reference potential for the IC12 pin; Described electronic spark coil test circuit is: produce square wave or other waveform signal with oscillator, driving power triode or VMOS field effect transistor and the elementary winding of Darlington triode break-make spark coil, the electronic spark coil test circuit of forming by IC1, N6, the oscillation frequency of R20, R21, C12 decision IC1, and dutycycle, through R22, R24 dividing potential drop, driving N 6 output square signals.