CN1042456C

CN1042456C - Device and method for judging deterioration of silicon control

Info

Publication number: CN1042456C
Application number: CN94116278A
Authority: CN
Inventors: 近藤英次
Original assignee: Shindengen Electric Manufacturing Co Ltd
Current assignee: Shindengen Electric Manufacturing Co Ltd
Priority date: 1993-09-22
Filing date: 1994-09-22
Publication date: 1999-03-10
Anticipated expiration: 2014-09-22
Also published as: KR0135371B1; JP2892917B2; KR950008965A; JPH0792222A; CN1109555A; TW243486B

Abstract

To detect the deterioration of a thyristor in an early stage with a simple constitution thereby to maintain various kinds of electronic and electric devices, by detecting the deterioration of the thyristor from logic output of a circuit for detecting a gate signal and a circuit for detecting a gate voltage. When an electricity from a power source PW is applied between an anode A (+) and a cathode K (-) of a thyristor S, a blocking function of the thyristor works before a predetermined voltage is achieved, and the thyristor is turned conductive when it is not lower than the predetermined voltage. However, if the thyristor S starts to deteriorate, a leak current is considered to flow out from a PN junction J2 which maintains a with stand voltage before the thyristor reaches the predetermined voltage, that is, a current equivalent to the leak current is considered to be generated through an internal resistance Tgamma. A voltage between a gate G and the cathode K based on the leak current is detected by a detecting circuit GK. When a required voltage is brought about between the gate G and cathode K while the gate signal is stopped (not generated yet), if a logic of a logic circuit AND is satisfied to generate a logic signal, the deterioration of the thyristor S can be detected in an early stage.

Description

Ignition device for internal combustion

The present invention relates to ignition device for internal combustion.

As everyone knows, controllable silicon can be as the various electrical equipment control devices of purposes such as the various switching devices of purposes such as rectification or phase control.But, this controllable silicon generally adds just (+) current potential and negative (-) current potential respectively at anode and negative electrode, by add grid voltage between grid and negative electrode, possesses the function that changes on state from forward blocking (nonconducting state) into.The sequential that adds this grid voltage (signal) is different because of various uses, but before this signal arrives, during promptly signal be " breaking ", the forward blocking of maintenance afore mentioned rules be normal state.But because of using all the year round, cause the characteristic variation,, can not keep the forward blocking function stipulated, cause short circuit etc. even if signal is for disconnected sometimes.Just might cause various parts, load etc. to be damaged when accident such as being short-circuited with the controllable silicon forming circuit.Therefore, guard against deterioration of silicon control in the past, add that various protective circuits being set, but still do not know to judge in early days the method and apparatus of this deterioration of silicon control state.

One of purpose of the present invention is to provide a kind of cheap deterioration of silicon control decision maker that addresses the above problem.

Another object of the present invention is to provide the ignition mechanism of the internal-combustion engine with this deterioration judging circuit.

The controllable silicon that deterioration judging dress of the present invention is suitable for adds direct current or alternating voltage (first voltage) between its anode (second electrode) and negative electrode (first electrode).For example alternately add " leading to " signal and " breaking " signal on the silicon controlled grid.When added signal is aforementioned " leading to " signal on the grid, be on state between silicon controlled anode and the negative electrode, flow through direct current or alternating current (a.c.) between the two.And signal is in nonconducting state when being aforementioned " breaking " signal between controllable silicon anode and the negative electrode, just do not have direct current or alternating current (a.c.) to flow through between the two.This signal is detected by signal testing circuit (first detection device), and first signal corresponding with " leading to " signal and " breaking " signal exports decision circuit (decision maker) to.

When signal was " leading to " signal, controllable silicon was in nonconducting state, thereby did not have electric current to flow through between grid and the negative electrode, thus voltage between the two actual be 0., during deterioration of silicon control, there is electric current to flow through between the two, produces voltage (second voltage) therebetween.Be conceived to this drain voltage among the present invention, when it surpasses defined threshold (being 0.4V among the embodiment), promptly judged deterioration of silicon control.That is to say,, when the voltage between grid and negative electrode surpasses the threshold voltage of regulation, promptly judge deterioration of silicon control although signal is " breaking " signal.For this reason, detect the voltage between grid and negative electrode by grid voltage testing circuit (second detection device), when this voltage surpassed respective threshold voltage, secondary signal was just exported to decision circuit.Decision circuit is judged deterioration of silicon control according to this secondary signal and same grid corresponding aforementioned first signal of signal that " breaks ".

The suitable safety installations of this deterioration judging device as the motor-helping car ignition device for internal combustion.

Fig. 1 is the pie graph of embodiment of the invention deterioration of silicon control decision maker.

Fig. 2 is the figure of explanatory drawing 1 device action.

Fig. 3 is the pie graph of engine ignitor.

Fig. 4 is the pie graph of ignition mechanism with embodiment of deterioration judging device.

Fig. 5 is the figure of explanatory drawing 4 device actions.

Fig. 6 is the pie graph of ignition mechanism with another embodiment of deterioration judging device.

Fig. 1 is the circuit diagram of one embodiment of the invention; S is silicon controlled equivalent constructions figure among the figure; A is an anode, and K is a negative electrode, and G is a grid; GC is a grid circuit from the signal in gap to the grid G of controllable silicon S that send; D0 is the gate protection diode, and GK is the voltage detecting circuit between controllable silicon grid G and negative electrode K, and IN is for detecting the signal testing circuit of signal by (not taking place); AND is for handling the circuit of two testing circuit GK, IN logic value, and PW is direct current or ac power supply.Voltage detecting circuit GK is operational amplifier specifically, the voltage V when between grid and negative electrode ^*GK is than reference voltage (0.4V is equivalent to threshold voltage) V ^*R hour, output negative signal, and reference voltage V ^*Voltage V between R≤grid and negative electrode ^*During GK, the output positive signal.

Followingly action is described with reference to Fig. 2.What at first Fig. 2 (a) solid line was represented is controllable silicon forward blocking characteristic, illustrate be with the anode A of controllable silicon S for just, negative electrode, has block function, and is voltage V when adding power supply PW for negative when being lower than assigned voltage ^*The above voltage of BO just is on state from triggering, and flows through electric current I A., controllable silicon begins variation, in the sectional view of controllable silicon S shown in Figure 1, can estimate, is reaching assigned voltage (V ^*BO) before, there is leakage current to flow out from keeping withstand voltage PN junction J2.Can think that this is equivalent to by the electric current of internal resistance r generation shown in the dotted line of (A) figure.Thereby the present invention detects grid and the voltage between negative electrode (Fig. 2 (B)) based on this leakage current by testing circuit GK.The grid voltage waveform (interruption) of following Fig. 2 (C) expression grid circuit GC.Also have Fig. 2 (D) to represent the inversion waveforms of this grid voltage that phase inverter IN causes.That is to say that signal is in " breaking " (break signal) state among the present invention, when having produced required voltage between grid and negative electrode, logical circuit " with " logic just set up, by producing the logical signal of Fig. 2 (e), judge the early stage deterioration of silicon controlled.When producing the logical signal of Fig. 2 (E), controllable silicon just has been judged to be deterioration.

Below explanation utilizes the applications of electronic circuitry example of decision circuit of the present invention.At first, shown in Fig. 3 is the circuit diagram that is referred to as the ignition device for internal combustion such as general two-wheel vehicle of capacitor charging/discharging ignition mechanism, D/D is the DC/DC transducer that cell voltage is boosted, D1 is a commutation diode, and C1 is the capacitor of savings electric charge, and PC is a pulse oscillator, GC is a gate circuit, S1 is a controllable silicon, and IG is a spark coil, and SP is a spark plug.Voltage with the DC/DC converter boost is added on the capacitor C1 through diode D rectification, charges to capacitor C1 thus.And produce and the synchronous fire signal of motor by pulse oscillator PC, give controllable silicon S1 by gate circuit GC.Fire signal is a signal when being " leading to ", the electric charge of capacitor C1 just by controllable silicon S1 to spark coil IG discharge, make plug ignition.

Like this, igniting must be carried out synchronously with pulse signal usually.But owing to reasons such as silicon controlled deterioration of withstand voltage of elements, controllable silicon is the conducting with the pulse oscillator signal not, and phenomenons such as motor damage or reverse just may take place.Therefore, the method for in the past taking is a plurality of controllable silicons to be connected in series prevent deterioration of withstand voltage of elements.

Fig. 4 is one embodiment of the invention, and the composition identical with Fig. 1 and Fig. 3 gives same numeral, and part is omitted its explanation.Q1 is a transistor, and at first just often, as previously mentioned, whenever the arrival of pulse oscillator signal, promptly when signal was " leading to ", controllable silicon S1 continued the igniting of spark plug SP with regard to conducting.This moment the controllable silicon each several part work wave as Fig. 5 (B)-(D) shown in the solid line.Below, suppose that controllable silicon is withstand voltage as Fig. 5 (A) dotted line variation, the waveform of controllable silicon each several part is then as Fig. 5 (B)-(D) shown in the dotted line.But at this moment rise with plate voltage VAK, silicon controlled grid voltage VGK a little 0.3V-0.4V that also rises, thereby after this voltage amplifies by GK, confirm not have the pulse oscillator signal, be that signal is " breaking " signal, (output that makes phase inverter IN output and operational amplifier GK mutually " with "), transistor Q1 is conducting.Thereby the D/D transducer stops its vibration, stops to charge to capacitor C1.Thus, silicon controlled plate voltage VAK stops to rise when Fig. 5 (A) ◎ point, can prevent deterioration of withstand voltage of elements and mis-ignition.

In the foregoing description, what the power supply of ignition mechanism was that the charging unit of capacitor adopts is the DC/DC transducer, but also can be as another employing generator shown in Figure 6 as power supply.Among Fig. 6, the composition identical with Fig. 4 embodiment put on identical symbol.EXT is the power coil of generator among the figure, and PC is the pulser generation coil that is built in this generator, and S2, S2 ' are controllable silicon.This circuit operation is a kind of like this mode, promptly exchanges the half cycle output of exporting by power coil EXT and makes diode D1 conducting, and to capacitor C1 charging, another half cycle output is then by diode D3 and ground short circuit.In this circuit, in case by with the decision signal of door AND output controllable silicon S1 deterioration, just conducting of controllable silicon S2, the output of generator EXT just and ground short circuit, to prevent capacitor C1 charging.

More than explanation is deterioration of silicon control decision circuit of the present invention to be used for the example of ignition mechanism, but should understand, can also be applicable to that other adopts the various machines of silicon controlled, and it also is possible utilizing deterioration signal to carry out various application such as alarm indication in addition.

As shown in the above description, according to the present invention, judge the early stage deterioration of silicon controlled by simple structure.And, deterioration of silicon control decision circuit of the present invention is applied to various electronic instruments, electrical equipment especially during ignition device for internal combustion, can improve their reliability with minimum cost.

Claims

1. ignition device for internal combustion comprises:

Controllable silicon;

The capacitor that is connected with described controllable silicon;

Device to described capacitor charging;

The spark plug of the electric charge igniting that obtains by described capacitor charging when described controllable silicon is on state;

It is characterized in that also comprising:

By add the signal of regulation to described controllable silicon grid, control the device of described controllable silicon on state, this signal is by making described controllable silicon be " leading to " signal of on state and " breaking " signal that is in nonconducting state therebetween being formed;

Detect first detection device of described signal;

Detect second detection device of voltage between described controllable silicon grid and the negative electrode;

Described first detection device detects described " breaking " signal, and second detection device is judged the device of described deterioration of silicon control when detecting between described grid and negative electrode voltage and surpassing defined threshold voltage;

When described decision maker is judged described deterioration of silicon control, stop device to described capacitor charging.

2. ignition mechanism as claimed in claim 1 is characterized in that described capacitor charging apparatus is the DC-DC transducer, and described charging halt circuit makes the described transducer failure of oscillations.

3. ignition mechanism as claimed in claim 1 is characterized in that described charging halt circuit stops the output of described capacitor charging apparatus to give described capacitor.

4. ignition mechanism as claimed in claim 3 is characterized in that described capacitor charging apparatus is a generator.

5. ignition mechanism as claimed in claim 3 is characterized in that described charging halt circuit makes the output and the ground short circuit of described capacitor charging apparatus.

6. ignition mechanism as claimed in claim 3 is characterized in that described charging halt circuit makes between described capacitor charging apparatus and the described capacitor and is nonconducting state.