CN103019138B - Current switching circuit - Google Patents

Abstract

The invention relates to a current switching circuit. The current switching circuit is mainly characterized by comprising a singlechip P1, a safing remove logic circuit module P2A, an ignition logic circuit module P2C, a TLP521-2 optocoupler P3, a safing circuit module P4 and an ignition circuit module P5. The singlechip P1 controls a chip with a model STC5410AD, the model of the TLP521-2 optocoupler P3 is TLP521-2, the singlechip P1 sends an arming signal to the safing remove logic circuit module P2A through a sequential control and removes the safing through the optocouple P3 and the insurance circuit module P4; after removing the safing, the singlechip P1sends an ignition signal to the ignition logic circuit module P2C, and realizes a switching hardware ignition through the TLP521-2 optocouple P3 and the ignition circuit module P5. The current switching circuit has the advantages of being reasonable in design, low in manufacturing cost, strong in electromagnetic interference resistance ability, safe and reliable in use and maintenance and the like.

Description

A kind of current switching circuit

Technical field

The present invention relates to a kind of current switching circuit, belong to technical field of electric device control, the weak current that it can be widely used in important switch controls, as car engine electronic starts, and electrical equipment control, fire alarm and security system, intelligent housing system etc.

Background technology

Control on important high-current switch in weak current, the stability of switching technique performance is limited to the electromagnetism stability of dry circuit itself to a great extent.Because controlled high-current switch generally belongs to high importance, require that high-current switch can not produce misoperation easily, otherwise will huge economic loss be caused.In background technology, the big current of weak current control both at home and abroad generally adopts control chip to pass through weak current pilot relay then controls the mode of high-current switch at present, adopt this control mode on the one hand because control chip and relay all belong to weak current prototype part, its stability to be easy to disturb by periphery electromagnetic environment, on the other hand, what adopt due to control chip and relay is a kind of series system, as long as wherein a disturbed controlled terminal that will cause produces misoperation, so the superposition of the risk of this control mode risk that is control chip and relay, its stability must decline.In order to overcome above defect, meeting the high security requirement of controlled high-current circuit, the current switching circuit of Small current control big current is studied.

Summary of the invention

Technical matters to be solved by this invention to provide a kind of current switching circuit, it adopts the method for a newly-increased road insurance control circuit, before single-chip microcomputer sends switch ignition signal, first arming sequence is provided by sequential control, only after arming, single-chip microcomputer just can send ignition signal and realize the igniting of switch hardware, it effectively can ensure that switch can not produce misoperation due to the interference by external electromagnetic environment, significantly improves the reliability of switch motion.

The technical scheme that the present invention solves the employing of its technical matters is: it comprises single-chip microcomputer P1, separates and protect application of logic circuit module P2A, Ignition Logic circuit module P2C, TLP521-2 optocoupler P3, insurance circuit module P4, firing circuit module P5,

The model of single-chip microcomputer P1 control chip is STC5410AD,

The model of optocoupler P3 is TLP521-2,

First single-chip microcomputer P1 protects application of logic circuit module P2A to solution by sequential control and provides arming sequence, by TLP521-2 optocoupler P3, insurance circuit module P4 arming; After arming, single-chip microcomputer P1 sends ignition signal to Ignition Logic circuit module P2C, realizes the igniting of switch hardware by TLP521-2 optocoupler P3, firing circuit module P5,

Arming:

First single-chip microcomputer P1 provides arming sequence according to Control timing sequence, arming sequence enters the CN1 pin separated and protect application of logic circuit module P2A, CN1 provides low level, this low level is after separating and protecting application of logic circuit module P2A driving, be transformed into No. 1 pin that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,7 of TLP521-2 optocoupler P3, No. 8 pin conductings, thus make triode Q1, Q2 conducting of insurance circuit module P4, arming sequence becomes high level from low level, and insurance is removed

Switch ignition:

Single-chip microcomputer P1 sends ignition signal again according to Control timing sequence, ignition signal enters the CN2 pin of igniting application of logic circuit module P2C, CN2 provides low level, this low level is after Ignition Logic circuit module P2C drives, be transformed into No. 3 pins that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,5 of TLP521-2 optocoupler P3, No. 6 pin conductings, thus make triode Q3, Q4 conducting of firing circuit module P5, ignition signal becomes high level from low level, and switch hardware action completes.

The present invention compares produced beneficial effect with background technology

1, devise a road insurance control circuit due to newly-increased on gauge tap circuit, under insurance controls undissolved situation, effectively can ensure that switch can not produce misoperation due to the interference by external electromagnetic environment, guarantee use safety.

2, after arming controls, owing to adopting two-way application of logic circuit module to drive optocoupler, then control the mode of igniting via multiple triodes of insurance circuit module and firing circuit module, significantly improve the reliability of ignition switch action.

3, it has the features such as reasonable in design, low cost of manufacture, anti-electromagnetic interference capability are strong, working service is safe and reliable.

Accompanying drawing explanation

Fig. 1 is the circuit theory design drawing of current switching circuit of the present invention.

Embodiment

Below in conjunction with accompanying drawing, most preferred embodiment of the present invention is further described.

A kind of current switching circuit, it comprises single-chip microcomputer P1, separates and protect application of logic circuit module P2A, Ignition Logic circuit module P2C, TLP521-2 optocoupler P3, insurance circuit module P4, firing circuit module P5.

The model of single-chip microcomputer P1 control chip is STC5410AD, and the model of optocoupler P3 is TLP521-2.

First single-chip microcomputer P1 protects application of logic circuit module P2A to solution by sequential control and provides arming sequence, by TLP521-2 optocoupler P3, insurance circuit module P4 arming; After arming, single-chip microcomputer P1 sends ignition signal to Ignition Logic circuit module P2C, realizes the igniting of switch hardware by TLP521-2 optocoupler P3, firing circuit module P5.

Arming:

First single-chip microcomputer P1 provides arming sequence according to Control timing sequence, arming sequence enters the CN1 pin separated and protect application of logic circuit module P2A, CN1 provides low level, this low level is after separating and protecting application of logic circuit module P2A driving, be transformed into No. 1 pin that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,7 of TLP521-2 optocoupler P3, No. 8 pin conductings, thus make triode Q1, Q2 conducting of insurance circuit module P4, arming sequence becomes high level from low level, and insurance is removed.

Switch ignition:

Single-chip microcomputer P1 sends ignition signal again according to Control timing sequence, ignition signal enters the CN2 pin of igniting application of logic circuit module P2C, CN2 provides low level, this low level is after Ignition Logic circuit module P2C drives, be transformed into No. 3 pins that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,5 of TLP521-2 optocoupler P3, No. 6 pin conductings, thus make triode Q3, Q4 conducting of firing circuit module P5, ignition signal becomes high level from low level, and switch hardware action completes.

Claims (2)

1. a current switching circuit, is characterized in that it comprises single-chip microcomputer P1, separates and protect application of logic circuit module P2A, Ignition Logic circuit module P2C, TLP521-2 optocoupler P3, insurance circuit module P4, firing circuit module P5;

The model of separating the chip protecting application of logic circuit module P2A and Ignition Logic circuit module P2C is 74LS00;

First single-chip microcomputer P1 protects application of logic circuit module P2A to solution by sequential control and provides arming sequence, by TLP521-2 optocoupler P3, insurance circuit module P4 arming;

After arming, single-chip microcomputer P1 sends ignition signal to Ignition Logic circuit module P2C, realizes the igniting of switch hardware by TLP521-2 optocoupler P3, firing circuit module P5;

When arming:

First single-chip microcomputer P1 provides arming sequence according to Control timing sequence, arming sequence enters the CN1 pin separated and protect application of logic circuit module P2A, CN1 provides low level, this low level is after separating and protecting application of logic circuit module P2A driving, be transformed into No. 1 pin that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,7 of TLP521-2 optocoupler P3, No. 8 pin conductings, thus make triode Q1, Q2 conducting of insurance circuit module P4, arming sequence becomes high level from low level, and insurance is removed;

When switch ignition:

Single-chip microcomputer P1 sends ignition signal again according to Control timing sequence, ignition signal enters the CN2 pin of igniting application of logic circuit module P2C, CN2 provides low level, this low level is after Ignition Logic circuit module P2C drives, be transformed into No. 3 pins that high level enters TLP521-2 optocoupler P3, make the controlled terminal closing of circuit of TLP521-2 optocoupler P3,5 of TLP521-2 optocoupler P3, No. 6 pin conductings, thus make triode Q3, Q4 conducting of firing circuit module P5, ignition signal becomes high level from low level, and switch hardware action completes.

2. current switching circuit according to claim 1, is characterized in that: the model of described single-chip microcomputer P1 control chip is STC5410AD.