RU3069U1 - ELECTRONIC SWITCH - Google Patents

Abstract

An electronic switch designed to operate in a non-contact ignition system of cars with a 12-volt on-board network complete with an ignition coil and a distribution sensor, comprising an input and output stage, characterized in that it contains a third stage made on the basis of an analogue chip of the ignition controller that performs functions for controlling the flow time and the amplitude of the current through the output stage and the ignition coil, as well as turning off the current when the engine is idle.

Description

The switch is designed for operation in a non-contact system, even your refueling unit is a 4-g 8-cylinder internal combustion engine with a nominal supply voltage of 12 V, Koshchzp at © r works complete with an ignition coil and a sensor distribute1. The prototype of the utility model in use is an electronic switch 11 3734L (Nomenclature catalog Automotive electrical equipment and devices, Moscow, 1985, Research Institute for Automotive Infections of the Automotive Industry), which lacks the possibility of controlling the time of current flow and limiting the current through the ignition coil. Electric% prototype circuit contains two stages. The first (input) cascade is a generator of rectangular pulses from the input (1® signal generated by rotation of the magneto-electric sensor (structurally made in a housing with a separator). The input signal has a shape that is close to sinusoidal. The amplitude and frequency of the input waveform vary fi of the rotational speed of the sensor-distributor shaft. The input stage generates rectangular pulses of constant amplitude with a frequency equal to the frequency of the input signal, pulse decay (transition from logical 1 to logical O sync The second stage is a powerful high-current electronic key (a powerful transistor operating in the key1§ || p @ 1ame). In series with a powerful key, turn on, a vaudgania coil (boost transformer with primary and secondary voltages) and an additional resistor c, puddles for orpamiiiiiBii | p1Sh1shchshy through the ignition coil of the current to a certain @ § vshshishn).

When the signal arriving at the input of a powerful transistor that matches logic I, the SHFFFF circuit opens and from the power source through an additional resistor, an ignition switch and a powerful transistor, current begins to flow. When you go to the input of a powerful signal transistor, it turns out1 (because of a logical logic, the transistor closes and the current through the ignition coil is abruptly interrupted, as a result of which a voltage pulse is induced in the first winding of the healing coils, which can be transformed into a secondary winding and increase to 20 iti This pulse “Aging is fed to the high-voltage switchgear of the sensor-distributor, and then to the ignition spark plugs and causes sparks @ W, breakdown of the air gap in the spark plugs. a triple in such a phase that in the absence of an input signal (with an evolving shaft of a re-distributor, that is, u} and a stopped motor) and in the connected supply voltage, the yk constantly flows through an additional resistor, an ignition coil, a powerful tranche p, causing them to heat up strongly, as well as a useful wipe of electric power board (car network and battery discharge.

The proposed model of a shyaznaya eliminates these shortcomings. Unlike prototsha, the proposed switch performs the following (| functions:

1. Limitation of the current amplitude to a predetermined value through the ignition coil (this necessitates the installation of an additional resistor).

2. Adjustable current flow time through the ignition coil KZ (a significant decrease in the average current consumption.

3. Overvoltage protection of the Power Transistor.

4. Smooth current flow through the ignition coil when the engine is stopped (overheating of the ignition coil, discharge of the battery pack is excluded, the reliability of the entire BSZ and electrical equipment as a whole is increased). The listed functional properties were realized thanks to the introduction of an analog integrated circuit into the switch circuit.

Figure 1 shows the electrical circuit diagram of the switch. The circuit contains four cascades. The first (input) cascade is made on elements: transistor UT1, diodes UD1-UDZ, capacitors CI-C3, C5, resistors SI-S4, performs the function of forming rectangular pulses from the input signal (close to a sinusoidal shape, is produced when the sensor rotor rotates in sensor-distributor) and synchronizes the decay of a rectangular pulse (the transition from logical I to logical O) with the moment of sparking by means of nmcoJBoro detection using elements UD2, C2, 3, Elements UD1, P2 provide an offset to transistor UT1 for increasing senses the input stage during operation at low engine speeds of 1 in starting mode. The second cascade is made on elements: chip DA1, capacitors C6-CIO, resistors 56, E7, P9-SI3, EI5. The DA1 chip represents codiift a specialized ignition controller, which is a separate electronic component and performs the following functions:

I. Together with the elements of ИО, И2, EI3, Р9, СУ, it performs the function of limiting to a certain magnitude of the current amplitude through a powerful output transistor, and consequently through a short-circuit ignition coil connected to the input terminal on one side and to the positive pole of the power source (battery ) on the other hand. The current is limited by

at

decrease in the control current of the output mopdy transistor UTZ (in total 14 microcircuits) and the introduction of the output transistor UTZ into the active mode of operation, as a result of which the internal resistance of the output transistor UTZ is rotated. 2. Microcircuit Ж together with elements C5, s: 5, performs the function of regulating the time the current flows through the ignition coil KZ (and also through the output power transistor UTZ). by delaying the flow of current and controlling the constancy of time npoTOtti current. 3. The Ml microcircuit together with the SII, KI5 elements performs the function of protecting the UTZ power transistor against overvoltage. According to pin 15, there is a zener diode in the structure of the output circuit | 4. The chip ДС together with the elements С7, КБ performing the function of smoothly absorbing current through the output power transistor UTZ, and therefore through the ignition coil КЗ in the absence of a signal at the input of the switch (in the absence of rotation of the rotor of the sensor b, i.e. when the engine is stopped) . A smooth shutdown of the current occurs by means of a major reduction to O of the control current (output 14 of the microcircuit) by the output power transistor UTZ. 5. The DDX microcircuit, together with the C6 elements, has the function of increasing the current flow through the ignition coil in the reaction mode © of the input signal frequency increment. The third cascade is driven by elements: the UT2 transistor, the UD4 diode, the URN zener diode, the Udb voltage limiter, the C4 capacitor, the K5, 7, 18 resistors, the UT2, UD5, Kb elements, form a voltage regulator for the DA1 circuit for the input stage. and

Capacitor C4 serves to filter the stabilized voltage. Resistor 57 serves as the dsh shams of the terminal stage of the microcircuit (output 16 of the microcircuit), and also by setting the required control current of the output powerful 1 razstzhstor UTZ (through the terminal cascade of the microcircuit). The UF6 limiter and resistor E8 perform the function of limiting the total voltage supply. The UD4 diode serves to protect the elements of the power supply unit when reversing the polarity of the power source (battery).

The fourth cascade is made on an element: transistor UTZ, resistor EI4, capacitor SI high-frequency inductor I I. The output power transistor UTZ serves to short-circuit the short circuit and performs the function of switching and limiting the current through the short-circuit coil. The PI4 resistor acts as a current sensor and serves to generate a feedback signal supplied to the microcircuit to perform all of the above functions. The SI capacitor is used to exclude high-frequency generation that occurs in the protection mode of the output powerful transistor from over-voltage. The high-frequency inductor I serves to protect the microcircuit from failure in the event of sparking to an increased clearance in the spark gaps about (spark plugs), this mode occurs in emergency operation when EOLHO plugged in or dropped out high voltage voltages from the ignition coil, from the distributor sensor or I8 of the ignition.

Claims (1)

An electronic switch designed to operate in a non-contact ignition system of cars with a 12-volt on-board network complete with an ignition coil and a distribution sensor, comprising an input and output stage, characterized in that it contains a third stage made on the basis of an analogue chip of the ignition controller that performs functions for controlling the flow time and the amplitude of the current through the output stage and the ignition coil, as well as turning off the current when the engine is idle.