CN205160489U - Contactless electronic relay's safety protection circuit - Google Patents
Contactless electronic relay's safety protection circuit Download PDFInfo
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- CN205160489U CN205160489U CN201520796214.4U CN201520796214U CN205160489U CN 205160489 U CN205160489 U CN 205160489U CN 201520796214 U CN201520796214 U CN 201520796214U CN 205160489 U CN205160489 U CN 205160489U
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Abstract
The utility model relates to a contactless electronic relay's safety protection circuit belongs to the electronic relay field. It includes rapid fuse, main switch circuit, self -destruction protection circuit, and its characteristics are: be applied to high limit switch during operation self -destruction protection circuit input end and isolating driver circuit connection, output and link main switch circuit, the DC load, the isolating driver circuit passes through control switch, rapid fuse is connected with main switch circuit, be applied to low limit switch during operation self -destruction protection circuit, main switch circuit input and control switch parallel connection, main switch circuit output is connected with the DC load, and self -destruction protection circuit input end passes through control switch, rapid fuse is connected with the DC load one end, and its output is connected with the the DC load other end. Ensure that the switch tube punctures the quick self -destruction in back out of control and hightails positive, avoid the load on fire. The problem of prior art do not have self breakdown protection circuit, lead to electronic relay load, the pencil of burning out out of control is solved.
Description
Technical field
The utility model relates to a kind of safety protective circuit of contactless electron relay, belongs to contactless electron relay technical field.
Background technology
Electronic relay has long service life, and reliability is strong, contacts highly sensitive, and no-spark is disturbed, and control power little, the feature that conversion speed is fast, market application foreground is wide.But in fact in fields such as vehicle-mounted starting relay, preheating relay, electric horn breaker point uniies, have the current still dominate of the electromagnetic relay of contact.The tube voltage drop that the first of tracing it to its cause substitutes the switching power tube of contact is large, and after conducting, greatly, easily breakdown, once breakdown short-circuit failure, be just equivalent to the contact adhesion of electromagnetic relay, consequence is very serious for power consumption and caloric value.
Such as: Chinese Patent Application No. is 200820224929.2, name is called that the power tube of " solid type diesel engine starting, preheating relay " is made up of 4 MOSFET pipes in parallel, wherein any one power tube punctures, capital causes relay out of control, its consequence is that load is burnt by being energized for a long time, even relatedly can burn wire harness, storage battery.
And for example: Chinese Patent Application No. is 201020161494.9, name is called that the power tube of " Novel electronic power switch of automobile starter " is also be formed in parallel by several MOSFET; although be provided with a lot of defencive function; but be all based on power tube do not have breakdown be intact when protection, do not consider that power tube self punctures the situation of inefficacy.
For another example: Chinese Patent Application No. is 201020603870.5, name is called that the power tube of " electronic flexible conjugate control device " adopts 1 MOSFET, does not also consider that power tube punctures the serious consequence of inefficacy.
Confirmed by market survey, some electronic relay products shortly emergent power pipe situation causing serious consequence out of control after putting on market, the laboratory that even also do not walk out had just has died young.
Summary of the invention
The purpose of this utility model is, provides one can guarantee to puncture rear quick self-destruction out of control at switching power tube, hightails positive source, avoids occurring load circuit and to smolder the safety protective circuit of contactless electron relay of fire accident; The switching power tube solving existing alternative contact, without self breakdown protection circuit, causes electronic relay out of control, burns the problem of load, even storage battery.
The utility model realizes above-mentioned purpose by the following technical solutions
This contactless electron relay
safetyprotective circuit comprises isolated drive circuit, control chip, rapid fuse, main switch circuit, self-destruction protective circuit, main switch circuit is made up of main switch Q1, piezo-resistance RV, voltage-stabiliser tube D, it is characterized in that: self-destruction protective circuit is made up of discrete component+power tube pattern or control chip+power tube pattern; When to be applied to main switch be flash state to self-destruction protective circuit, the input of self-destruction protective circuit is connected with isolated drive circuit, and the output of self-destruction protective circuit is connected in parallel to main switch circuit, DC load; Isolated drive circuit is connected with main switch circuit by control switch, rapid fuse;
When to be applied to main switch be low limit state to self-destruction protective circuit; the input of self-destruction protective circuit, the input of main switch circuit and control switch are connected in parallel; the output of main switch circuit is connected with one end of DC load; the input of self-destruction protective circuit is connected with DC load by control switch, rapid fuse, and the output of self-destruction protective circuit connects the other end of DC load by wire.
Described self-destruction protective circuit be applied to main switch be flash state, adopt discrete component+power tube pattern time, it is made up of power tube Q2, NPN type triode Q3, resistance R1 ~ R4, voltage-stabiliser tube D1, electric capacity C;
The grid of power tube Q2 is connected in parallel by the 1. end of NPN type triode Q3, resistance R4 and S end, isolated drive circuit, the grid of power tube Q2 is connected with the 4. end of isolated drive circuit by resistance R1, the drain electrode of power tube Q2 is connected in parallel the source electrode of main switch Q1, one end of DC load of main switch circuit, 2. end, the source electrode of power tube Q2, the emitter of NPN type triode Q3, electric capacity C, resistance R2, resistance R3, the positive pole of voltage-stabiliser tube D1, the negative terminal of power supply E, the equal ground connection of the other end of DC load of isolated drive circuit; 3. the end of isolated drive circuit is connected with the negative pole of the voltage-stabiliser tube D of main switch circuit, the gate connected in parallel of main switch Q1, and 5. the drain electrode of the main switch Q1 of main switch circuit is held and connected S end by rapid fuse, control switch K.
Described self-destruction protective circuit be applied to main switch be flash state, adopt control chip+power tube pattern time, it is made up of control chip, power tube Q2, voltage-stabiliser tube D1;
The negative pole of 5. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, the drain electrode of power tube Q2 and the source electrode of main switch Q1 of main switch circuit, one end of DC load are connected in parallel, the negativing ending grounding of the other end of the source electrode of power tube Q2, the positive pole of voltage-stabiliser tube D1, DC load, 2. end, the power supply E of control chip MCU;
7. the end of control chip MCU is connected in parallel the positive pole of voltage-stabiliser tube D of isolated drive circuit, main switch circuit, control chip MCU 1. hold the drain electrode of the main switch Q1 by S end, control switch K, rapid fuse and main switch circuit, isolated drive circuit, control chip MCU 4. end be connected in parallel, 3. the end of control chip MCU is connected with the input of isolated drive circuit, and 6. the output of isolated drive circuit hold the grid of the main switch Q1 being connected in parallel main switch circuit, the negative pole of voltage-stabiliser tube D.
Described self-destruction protective circuit be applied to main switch be low limit state, adopt discrete component+power tube pattern time, it is made up of power tube Q2, NPN type triode Q3, PNP type triode Q4, resistance R1 ~ R7, electric capacity C, voltage-stabiliser tube D1, piezo-resistance RV;
The grid of power tube Q2 holds connection by NPN type triode Q3, resistance R5, resistance R4 and S, piezo-resistance RV is connected with between the drain electrode of power tube Q2 and ground, 1. the end of the emitter of the drain electrode of power tube Q2 and resistance R7, PNP type triode Q4, rapid fuse, DC load is connected in parallel, and the 2. end of DC load is connected with the source electrode of the main switch Q1 of main switch circuit;
The base stage of NPN type triode Q3 is connected in parallel to resistance R3, resistance R5, resistance R3 ground connection; The gate connected in parallel of the main switch Q1 of main switch circuit is connected with resistance R5, resistance R4, and the grid of main switch Q1 is held by resistance R4 and S and connected; The equal ground connection of emitter of the source electrode of power tube Q2, the positive pole of voltage-stabiliser tube D1, electric capacity C, resistance R2, NPN type triode Q3, the drain electrode of the main switch Q1 of main switch circuit connects the base stage of PNP type triode Q4 by resistance R6, the collector electrode of PNP type triode Q4 is connected in parallel the grid of power tube Q2, the collector electrode of NPN type triode Q3 by resistance R1.
Described self-destruction protective circuit be applied to main switch be low limit state, adopt control chip+power tube pattern time, it is made up of control chip, power tube Q2, piezo-resistance RV, voltage-stabiliser tube D1;
The negative pole of 3. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, is connected with piezo-resistance RV between the collector electrode of power tube Q2 and ground, the source ground of power tube Q2; 1. holding of control chip MCU is connected in parallel one end of DC load, the drain electrode of power tube Q2, the 4. end of control chip MCU by S end, control switch K, rapid fuse; 2. end, the positive pole of voltage-stabiliser tube D1, the source grounding of power tube Q2 of control chip MCU; 6. the end of control chip MCU is connected in parallel the drain electrode of main switch circuit main switch Q1, the other end of DC load; 5. the end of control chip MCU is connected with the grid of main switch Q1.
The utility model beneficial effect is compared with prior art
The safety protective circuit of this contactless electron relay is high potential or electronegative potential for electronic relay main switch circuit power tube position, is divided into discrete component or control chip two kinds of situations for the logical drive of self-destruction protective circuit; design one group of four circuit respectively; can guarantee to puncture rear quick self-destruction out of control at switching power tube; hightail positive source, avoid occur load circuit smolder on fire, burn the wire harness even serious accident of storage battery.Circuit structure is simple, and all standing protected effect is good.Through actual service test, its working stability is reliable.The switching power tube solving existing alternative contact well, without self breakdown protection circuit, causes electronic relay out of control, burns the problem of load, even storage battery.
Accompanying drawing explanation
Fig. 1 is the structural representation that a kind of safety protective circuit of contactless electron relay is applied to that main switch is flash state, employing discrete component+power tube pattern;
Fig. 2 is the structural representation that a kind of safety protective circuit of contactless electron relay is applied to that main switch is flash state, employing control chip+power tube pattern;
Fig. 3 is the structural representation that a kind of safety protective circuit of contactless electron relay is applied to that main switch is low limit state, employing discrete component+power tube pattern;
Fig. 4 is the structural representation that a kind of safety protective circuit of contactless electron relay is applied to that main switch is low limit state, employing control chip+power tube pattern.
In figure: 1, self-destruction protective circuit, 2, main switch circuit, 3, rapid fuse.
Embodiment
Below in conjunction with accompanying drawing, execution mode of the present utility model is described in detail:
This contactless electron relay
safetyprotective circuit comprises isolated drive circuit, control chip, rapid fuse, main switch circuit, self-destruction protective circuit, and main switch circuit is made up of main switch Q1, piezo-resistance RV, voltage-stabiliser tube D; Self-destruction protective circuit 1 is made up of discrete component+power tube pattern or control chip+power tube pattern; When to be applied to main switch Q1 be flash state to self-destruction protective circuit 1 (see Fig. 1,2), the input of self-destruction protective circuit 1 is connected with isolated drive circuit, and the output of self-destruction protective circuit 1 is connected in parallel to main switch circuit 2, DC load; Isolated drive circuit is connected with main switch circuit 2 by control switch K, rapid fuse 3;
When to be applied to main switch Q1 be low limit state to self-destruction protective circuit 1 (see Fig. 3,4); the input of self-destruction protective circuit 1, the input of main switch circuit 2 and control switch K are connected in parallel; the output of main switch circuit 2 is connected with one end of DC load; the input of self-destruction protective circuit 1 is connected with DC load by control switch K, rapid fuse 3, and the output of self-destruction protective circuit 1 connects the other end of DC load by wire.
Described self-destruction protective circuit 1 is applied to (see Fig. 1) when main switch Q1 is flash state and adopts discrete component+power tube pattern, and it is made up of power tube Q2, NPN type triode Q3, resistance R1 ~ R4, voltage-stabiliser tube D1, electric capacity C;
The grid of power tube Q2 is connected in parallel by the 1. end of NPN type triode Q3, resistance R4 and S end, isolated drive circuit, the grid of power tube Q2 is connected with the 4. end of isolated drive circuit by resistance R1, the drain electrode of power tube Q2 is connected in parallel the source electrode of main switch Q1, one end of DC load of main switch circuit 2,2. end, the source electrode of power tube Q2, the emitter of NPN type triode Q3, electric capacity C, resistance R2, resistance R3, the positive pole of voltage-stabiliser tube D1, the negative terminal of power supply E, the equal ground connection of the other end of DC load of isolated drive circuit; 3. the end of isolated drive circuit is connected with the negative pole of the voltage-stabiliser tube D of main switch circuit 2, the gate connected in parallel of main switch Q1, and 5. the drain electrode of the main switch Q1 of main switch circuit 2 is held and connected S end by rapid fuse 3, control switch K.
Described self-destruction protective circuit 1 is applied to (see Fig. 2) when main switch Q1 is flash state and adopts control chip+power tube pattern, and it is made up of control chip, power tube Q2, voltage-stabiliser tube D1;
The negative pole of 5. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, the drain electrode of power tube Q2 and the source electrode of main switch Q1 of main switch circuit 2, one end of DC load are connected in parallel, the equal ground connection of negative terminal of the other end of the source electrode of power tube Q2, the positive pole of voltage-stabiliser tube D1, DC load, 2. end, the power supply E of control chip MCU;
7. the end of control chip MCU is connected in parallel the positive pole of voltage-stabiliser tube D of isolated drive circuit, main switch circuit 2, control chip MCU 1. hold the drain electrode of the main switch Q1 by S end, control switch K, rapid fuse 3 and main switch circuit 2, isolated drive circuit, control chip MCU 4. end be connected in parallel; 3. the end of control chip MCU is connected with the input of isolated drive circuit, and 6. the output of isolated drive circuit hold the grid of the main switch Q1 being connected in parallel main switch circuit 2, the negative pole of voltage-stabiliser tube D.
Described self-destruction protective circuit 1 is applied to (see Fig. 3) when main switch Q1 is low limit state and adopts discrete component+power tube pattern, and it is made up of power tube Q2, NPN type triode Q3, PNP type triode Q4, resistance R1 ~ R7, electric capacity C, voltage-stabiliser tube D1, piezo-resistance RV;
The grid of power tube Q2 holds connection by NPN type triode Q3, resistance R5, resistance R4 and S, piezo-resistance RV is connected with between the drain electrode of power tube Q2 and ground, 1. the end of the emitter of the drain electrode of power tube Q2 and resistance R7, PNP type triode Q4, rapid fuse 3, DC load is connected in parallel, and the 2. end of DC load is connected with the drain electrode of the main switch Q1 of main switch circuit 2;
The base stage of NPN type triode Q3 is connected in parallel to resistance R3, resistance R5, resistance R3 ground connection; The gate connected in parallel of the main switch Q1 of main switch circuit 2 is connected with resistance R5, resistance R4, and the grid of main switch Q1 is held by resistance R4 and S and connected; The equal ground connection of emitter of the source electrode of power tube Q2, the positive pole of voltage-stabiliser tube D1, electric capacity C, resistance R2, NPN type triode Q3; The drain electrode of the main switch Q1 of main switch circuit 2 connects the base stage of PNP type triode Q4 by resistance R6, the collector electrode of PNP type triode Q4 is connected in parallel the grid of power tube Q2, the collector electrode of NPN type triode Q3 by resistance R1.
It is low limit state that described self-destruction protective circuit 1 is applied to main switch Q1, and when adopting control chip+power tube pattern (see Fig. 4), it is made up of control chip, power tube Q2, piezo-resistance RV, voltage-stabiliser tube D1;
The negative pole of 3. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, is connected with piezo-resistance RV between the drain electrode of power tube Q2 and ground, the source ground of power tube Q2; 1. holding of control chip MCU is connected in parallel one end of DC load, the drain electrode of power tube Q2, the 4. end of control chip MCU by S end, control switch K, rapid fuse 3; 2. end, the positive pole of voltage-stabiliser tube D1, the source grounding of power tube Q2 of control chip MCU; 6. the end of control chip MCU is connected in parallel the drain electrode of main switch Q1, the other end of DC load of main switch circuit 2; 5. the end of control chip MCU is connected with the grid of main switch Q1.
The utility model is divided into flash and two kinds, low limit situation for electronic relay switches power tube position in circuit, for the logical drive of self-destruction protective circuit 1 by discrete component or control chip MCU(integrated monolithic machine programme control circut) two kinds of situations that mode realizes, develop the safety protective circuit of four contactless electron relays under an inventive concept framework, can guarantee under any circumstance switching power tube puncture out of control rear all can quick self-destruction, hightail positive source, avoiding that load circuit occurs smolders on fire, burn the wire harness even serious accident of storage battery.
Below the specific embodiment of the safety protective circuit of this contactless electron relay:
A, (see Fig. 1) when self-destruction protective circuit 1 be applied to main switch Q1 be flash state and adopt discrete component+power tube pattern time, self-destruction protective circuit 1 is made up of power tube Q2, NPN type triode Q3, resistance R1 ~ R4, voltage-stabiliser tube D1, electric capacity C;
When main switch Q1 does not puncture: when control switch K closes, S holds electric, also namely isolated drive circuit 1. 2. hold electric, isolated drive circuit 3. 4. port output drive signal to main switch circuit 2, (isolated drive circuit belongs to ripe circuit, and therefore not to repeat here.) grid of main switch Q1 of main switch circuit 2 is high potential and conducting at once, the 4. end of isolated drive circuit presents high potential, and DC load obtains electric normal work.Meanwhile, because S holds electric, this voltage impels NPN type triode Q3 conducting through resistance R4 and resistance R3 dividing potential drop, rapidly the grid of the power tube Q2 of self-destruction protective circuit 1 is pulled down to ground, makes power tube Q2 be in cut-off state all the time.
The object arranging electric capacity C avoids instantaneous interference signal to cause self-destruction protective circuit 1 to affect main circuit by the unexpected conducting of power tube Q2.
When control switch K disconnects, isolation drive blackout, main switch Q1 ends, and isolated drive circuit 4. terminal potential becomes electronegative potential, and DC load dead electricity is deactivated.Now self-destruction protective circuit 1 is also in cut-off state because each port of power-off is electronegative potential.
Main switch Q1 is breakdown conditions: K switch disconnects, the main switch Q1 of main switch circuit 2 punctures inefficacy, namely isolated drive circuit output 3. 4. potential difference be zero, but 4. its port is in high potential because main switch Q1 punctures, DC load not controllably electric work.Now S terminal voltage is zero, resistance R4 and resistance R3 no current flow through, the NPN type triode Q3 of therefore self-destruction protective circuit 1 is in cut-off state without drive current, isolated drive circuit 4. terminal voltage to be powered to the grid of the power tube Q2 of self-destruction protective circuit 1 through resistance R1 and is made it rapid conducting, by direct for DC load short circuit, power supply B+ holds and directly arrives ground short circuit through fusible link 3 and the main switch Q1 that punctured inefficacy; This short circuit current is enough to make rapid fuse 3 quick-break, even if 5. hold dead electricity thus make DC load depart from positive source, circuit safety is ensured.
Another meaning arranging rapid fuse 3 is, when power supply connects instead by user by mistake, the parasitic diode being present in main switch Q1 and power tube Q2 inside conducting at once can produce great short circuit current by rapid fuse 3 quick-break.
In addition, when DC load short circuit, rapid fuse 3 also can quick-break.Therefore rapid fuse 3 is set there is multiple protective meaning.
Piezo-resistance RV in main switch circuit 2, for absorbing high voltage transient when external glitch voltage and inductive load break-make, guarantees that power tube is not broken down by high-voltage, and plays pressure limiting effect.
B, (see Fig. 2) are flash state when self-destruction protective circuit 1 is applied to main switch Q1, and when adopting control chip+power tube pattern, self-destruction protective circuit 1 is made up of power tube Q2, NPN type triode Q3, resistance R1 ~ R4, voltage-stabiliser tube D1, electric capacity C;
When main switch Q1 does not puncture: K switch closes, S holds the 1. end of electric i.e. control chip MCU obtains initiating signal, program control output high potential signal to isolated drive circuit input 3., from 6. holding output drive signal to make main switch Q1 conducting after isolated drive circuit isolation boosting, 7. terminal potential is uprised by low, DC load therefore electric work.Now control chip MCU is judged as normal condition, therefore not output protection signal, and namely 5. end is electronegative potential, and the power tube Q2 in self-destruction protective circuit 1 is in cut-off state; When K switch disconnects, the 1. end signal of control chip MCU disappears, and program control output signal becomes electronegative potential immediately, and namely isolated drive circuit boosting driving is input as electronegative potential, and export also in electronegative potential, therefore main switch Q1 ends, and DC load dead electricity is deactivated.Self-destruction protective circuit 1 is still in cut-off state without input.
Main switch Q1 is breakdown conditions: when the main switch Q1 of main switch circuit 2 is out of control because puncturing, K switch is not closed, main switch Q1 punctures and makes 7. to hold to be in high potential, DC load obtains electric work, control chip MCU judges that main switch Q1 is puncture short state thus, send the guard signal of high potential at once to 5. holding, the power tube Q2 of self-destruction protective circuit 1 becomes conducting by DC load two terminal shortcircuit from cut-off at once, huge short circuit current flows through rapid fuse 3, rapid fuse 3 quick-break makes DC load depart from positive source, circuit safety is protected.
Voltage-stabiliser tube D in the main switch circuit 2 and voltage-stabiliser tube D1 in self-destruction protective circuit 1 in order to limit grid voltage, not reason grid voltage too high damage MOS power tube.
C, (see Fig. 3) are low limit state when self-destruction protective circuit 1 is applied to main switch, and when adopting discrete component+power tube pattern, self-destruction protective circuit 1 is made up of power tube Q2, NPN type triode Q3, PNP type triode Q4, resistance R1 ~ R7, electric capacity C, voltage-stabiliser tube D1, piezo-resistance RV;
When main switch Q1 does not puncture: control switch K closes, and S holds electric, provides drive singal, main switch Q1 therefore conducting through resistance R4 to the main switch Q1 grid of main switch circuit 2,2. the negative terminal of DC load is connected with power supply E negative pole and obtains electric work.Meanwhile, the base stage of NPN type triode Q3 also because resistance R5 flows through electric current and conducting, and by the grid of power tube Q2 short circuit over the ground, makes power tube Q2 be in cut-off state.PNP type triode Q4 is in conducting state because 2. holding for electronegative potential, but conducting is by the gate short of power tube Q2 because of NPN type triode Q3, and therefore the conducting of PNP type triode Q4 also can not change the state of power tube Q2.When K switch disconnects, S holds dead electricity, and the grid of the main switch Q1 of main switch circuit 2 loses drive singal and ends, and namely the 2. end of DC load uprises current potential by electronegative potential and deactivates; Due to the high potential 2. held, the state of PNP type triode Q4 is caused to be also cut-off state by original conducting state saltus step.
Main switch Q1 is breakdown conditions: when the main switch Q1 of main switch circuit 2 is out of control because puncturing, situation just there occurs change, K switch is not closed, main switch Q1 punctures and makes 2. to hold to be in electronegative potential, DC load obtains electric work, 2. electronegative potential is held to cause PNP type triode Q4 conducting, cathode power supply is incorporated into the grid of power tube Q2 by resistance R1 through PNP type triode Q4, and NPN type triode Q3 holds without electricity because of S therefore is in cut-off state without base current always, therefore, the grid of power tube Q2 maintains high potential, consequently by the positive terminal of DC load 1. direct and ground short circuit, huge electric current transient flow is crossed rapid fuse 3 and is fused, the positive pole of DC load is made 1. to depart from positive source, circuit safety is protected.
In like manner, rapid fuse 3 plays anti-reverse and load short circuit protection function equally.
Piezo-resistance RV in piezo-resistance RV in self-destruction protective circuit 1 and main switch circuit 2, being the high voltage transient for absorbing when external glitch voltage and inductive load break-make equally, guaranteeing that MOS power tube is not broken down by high-voltage.Voltage-stabiliser tube D and voltage-stabiliser tube D1 is that restriction grid voltage is unlikely too high equally, avoids damaging MOS power tube.
D, (see Fig. 4) are low limit state when self-destruction protective circuit 1 is applied to main switch Q1, and when adopting control chip+power tube pattern, self-destruction protective circuit 1 is made up of control chip, power tube Q2, piezo-resistance RV, voltage-stabiliser tube D1;
When main switch does not puncture: K switch closes, S holds the 1. end of electric i.e. control chip MCU obtains initiating signal, and 5. program control output high potential signal drives input to boosting, main switch Q1 conducting immediately, 6. terminal potential is by high step-down, DC load therefore electric work.Now control chip MCU is judged as normal condition, therefore not output protection signal, and namely 3. end is electronegative potential, and the power tube Q2 of self-destruction protective circuit 1 is in cut-off state; When K switch disconnects, the 1. end signal of control chip MCU disappears, and 5. program control output signal becomes electronegative potential immediately, and therefore main switch Q1 also ends, and DC load dead electricity is deactivated.Self-destruction protective circuit 1 is also without inputting therefore being still in cut-off state.
Main switch Q1 is breakdown conditions: when the main switch Q1 of main switch circuit 2 is out of control because puncturing, K switch is not closed, main switch Q1 punctures and makes 6. to hold to be in electronegative potential, DC load obtains electric work, control chip MCU judges that main switch Q1 is that puncture short state sends the guard signal of high potential at once to 3. holding thus, the power tube Q2 of self-destruction protective circuit 1 becomes conducting by DC load shorted to earth from cut-off at once, huge short circuit current flows through rapid fuse 3, rapid fuse 3 fuses, DC load is made to depart from positive source, circuit safety is protected.
In like manner, rapid fuse 3 plays anti-reverse and load short circuit protection function equally.
Piezo-resistance RV in piezo-resistance RV in self-destruction protective circuit 1 and main switch circuit 2, being the high voltage transient for absorbing when external glitch voltage and inductive load break-make equally, guaranteeing that MOS power tube is not broken down by high-voltage.Voltage-stabiliser tube D and voltage-stabiliser tube D1 is that restriction grid voltage is unlikely too high equally, avoids damaging MOS power tube.
The protective circuit of this contactless electron relay is solve the maximum doubt of electronic relay; namely switching power tube easily punctures inefficacy and devises protective circuit especially; guaranteeing after switching power tube punctures (being equivalent to contact adhesion) out of control can quick self-destruction, reaches to hightail positive source, do not occur that load circuit is smoldered the object of the security incident such as on fire.
The above is the embodiment of this invention, above-mentioned illustrating is not construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field can make an amendment above-mentioned embodiment or be out of shape after having read this specification, and does not deviate from essence of the present utility model and scope.
Claims (5)
1. the safety protective circuit of a contactless electron relay, it comprises isolated drive circuit, control chip, rapid fuse (3), main switch circuit (2), self-destruction protective circuit (1), main switch circuit (2) is made up of main switch Q1, piezo-resistance RV, voltage-stabiliser tube D, it is characterized in that: self-destruction protective circuit (1) is made up of discrete component+power tube pattern or control chip+power tube pattern; When to be applied to main switch Q1 be flash state to self-destruction protective circuit (1), the input of self-destruction protective circuit (1) is connected with isolated drive circuit, and the output of self-destruction protective circuit (1) is connected in parallel to main switch circuit (2), DC load; Isolated drive circuit is connected with main switch circuit (2) by control switch K, rapid fuse (3); When to be applied to main switch Q1 be low limit state to self-destruction protective circuit (1); the input of self-destruction protective circuit (1), the input of main switch circuit (2) and control switch K are connected in parallel; the output of main switch circuit (2) is connected with one end of DC load; the input of self-destruction protective circuit (1) is connected with DC load by control switch K, rapid fuse (3), and the output of self-destruction protective circuit (1) connects the other end of DC load by wire.
2. the safety protective circuit of a kind of contactless electron relay according to claim 1, it is characterized in that: described self-destruction protective circuit (1) be applied to main switch Q1 be flash state and adopt discrete component+power tube pattern time, it is made up of power tube Q2, NPN type triode Q3, resistance R1 ~ R4, voltage-stabiliser tube D1, electric capacity C; The grid of power tube Q2 is connected in parallel by the 1. end of NPN type triode Q3, resistance R4 and S end, isolated drive circuit, the grid of power tube Q2 is connected with the 4. end of isolated drive circuit by resistance R1, the drain electrode of power tube Q2 is connected in parallel the source electrode of main switch Q1, one end of DC load of main switch circuit (2), 2. end, the source electrode of power tube Q2, the emitter of NPN type triode Q3, electric capacity C, resistance R2, resistance R3, the positive pole of voltage-stabiliser tube D1, the negative terminal of power supply E, the equal ground connection of the other end of DC load of isolated drive circuit; 3. the end of isolated drive circuit is connected with the negative pole of the voltage-stabiliser tube D of main switch circuit (2), the gate connected in parallel of main switch Q1, and the drain electrode of the main switch Q1 of main switch circuit (2) is 5. held and connected S end by rapid fuse (3), control switch K.
3. the safety protective circuit of a kind of contactless electron relay according to claim 1, it is characterized in that: described self-destruction protective circuit (1) be applied to main switch Q1 be flash state and adopt control chip+power tube pattern time, it is made up of control chip, power tube Q2, voltage-stabiliser tube D1; The negative pole of 5. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, the source electrode of main switch Q1, one end of DC load of the drain electrode of power tube Q2 and main switch circuit (2) are connected in parallel, the equal ground connection of negative terminal of the other end of the source electrode of power tube Q2, the positive pole of voltage-stabiliser tube D1, DC load, 2. end, the power supply E of control chip MCU; 7. the end of control chip MCU is connected in parallel the positive pole of voltage-stabiliser tube D of isolated drive circuit, main switch circuit (2), 1. the end of control chip MCU is connected in parallel by the 4. end of the drain electrode of S end, control switch K, rapid fuse (3) and the main switch Q1 of main switch circuit (2), isolated drive circuit, control chip MCU, 3. the end of control chip MCU is connected with the input of isolated drive circuit, and 6. the output of isolated drive circuit hold the grid of the main switch Q1 being connected in parallel main switch circuit (2), the negative pole of voltage-stabiliser tube D.
4. the safety protective circuit of a kind of contactless electron relay according to claim 1, it is characterized in that: described self-destruction protective circuit (1) be applied to main switch Q1 be low limit state and adopt discrete component+power tube pattern time, it is made up of power tube Q2, NPN type triode Q3, PNP type triode Q4, resistance R1 ~ R7, electric capacity C, voltage-stabiliser tube D1, piezo-resistance RV; The grid of power tube Q2 holds connection by NPN type triode Q3, resistance R5, resistance R4 and S, piezo-resistance RV is connected with between the drain electrode of power tube Q2 and ground, 1. the end of the emitter of the drain electrode of power tube Q2 and resistance R7, PNP type triode Q4, rapid fuse, DC load is connected in parallel, and the 2. end of DC load is connected with the source electrode of the main switch Q1 of main switch circuit (2); The base stage of NPN type triode Q3 is connected in parallel to resistance R3, resistance R5, resistance R3 ground connection; The gate connected in parallel of the main switch Q1 of main switch circuit (2) is connected with resistance R5, resistance R4, and the grid of main switch Q1 is held by resistance R4 and S and connected; The equal ground connection of emitter of the emitter of power tube Q2, the positive pole of voltage-stabiliser tube D1, electric capacity C, resistance R2, NPN type triode Q3, the drain electrode of the main switch Q1 of main switch circuit (2) connects the base stage of PNP type triode Q4 by resistance R6, the collector electrode of PNP type triode Q4 is connected in parallel the grid of power tube Q2, the collector electrode of NPN type triode Q3 by resistance R1.
5. the safety protective circuit of a kind of contactless electron relay according to claim 1, it is characterized in that: described self-destruction protective circuit (1) be applied to main switch Q1 be low limit state and adopt control chip+power tube pattern time, it is made up of control chip, power tube Q2, piezo-resistance RV, voltage-stabiliser tube D1; The negative pole of 3. end, the voltage-stabiliser tube D1 of the gate connected in parallel connection control chip MCU of power tube Q2, is connected with piezo-resistance RV between the drain electrode of power tube Q2 and ground, the source ground of power tube Q2; 1. the end of control chip MCU is connected in parallel one end of DC load, the drain electrode of power tube Q2, the 4. end of control chip MCU by S end, control switch K, rapid fuse (3); 2. end, the positive pole of voltage-stabiliser tube D1, the source grounding of power tube Q2 of control chip MCU; 6. the end of control chip MCU is connected in parallel the drain electrode of main switch Q1, the other end of DC load of main switch circuit (2); 5. the end of control chip MCU is connected with the grid of main switch Q1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520796214.4U CN205160489U (en) | 2015-10-13 | 2015-10-13 | Contactless electronic relay's safety protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520796214.4U CN205160489U (en) | 2015-10-13 | 2015-10-13 | Contactless electronic relay's safety protection circuit |
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| CN205160489U true CN205160489U (en) | 2016-04-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207652A (en) * | 2015-10-13 | 2015-12-30 | 吴子乔 | Safety protection circuit of contactless electronic relay |
| CN110103911A (en) * | 2019-05-13 | 2019-08-09 | 思与行科技(苏州)有限公司 | Wheel speed sensors interface control circuit for active electronic braking system |
| CN111969984A (en) * | 2020-08-11 | 2020-11-20 | 浙江世菱电力电子有限公司 | Direct-current contactless solid-state relay |
-
2015
- 2015-10-13 CN CN201520796214.4U patent/CN205160489U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207652A (en) * | 2015-10-13 | 2015-12-30 | 吴子乔 | Safety protection circuit of contactless electronic relay |
| CN105207652B (en) * | 2015-10-13 | 2018-03-09 | 吴子乔 | A kind of safety protective circuit of contactless electron relay |
| CN110103911A (en) * | 2019-05-13 | 2019-08-09 | 思与行科技(苏州)有限公司 | Wheel speed sensors interface control circuit for active electronic braking system |
| CN111969984A (en) * | 2020-08-11 | 2020-11-20 | 浙江世菱电力电子有限公司 | Direct-current contactless solid-state relay |
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