CN101039111A - Inductive load switch circuit capable of switching off quickly - Google Patents
Inductive load switch circuit capable of switching off quickly Download PDFInfo
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- CN101039111A CN101039111A CN 200610018578 CN200610018578A CN101039111A CN 101039111 A CN101039111 A CN 101039111A CN 200610018578 CN200610018578 CN 200610018578 CN 200610018578 A CN200610018578 A CN 200610018578A CN 101039111 A CN101039111 A CN 101039111A
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- semiconductor
- inductance
- load switch
- inductive load
- switch circuit
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Abstract
The invention belongs to an inductance loading switching circuit especially belongs to an inductance loading switching circuit which can be turned off immediately. The invention relates to an inductance loading switching circuit which can be turned off immediately comprising an inductance loading switching circuit composed by a power connection, an inductance, a diode and a semiconductor. The invention is characterized in that one of the poles of the power connection is connected with a controlling semiconductor and a newly-added diode. The two ends of the controlling semiconductor supplies electricity to the inductance loading switching circuit. One end of the newly-added diode is connected with the controlling semiconductor and the other end of the newly-added diode is connected with the other pole of the power connection. The advantages of the invention are that although small modification is made to the original circuit, which means that only a controlling semiconductor and a diode is added, the need of the fuel injection electromagnetic valve the for the control circuit is satisfied. Once the circuit is turned off, the current of the inductance decreases rapidly. The time for turning off is less than1/10 to the original. The fuel injection electromagnetic valve can be turned off promptly, thus making the injection of the fuel precise, the engine running stably and the working life long.
Description
Technical field
The invention belongs to inductive load switch circuit, especially belong to the inductive load switch circuit that can turn-off rapidly.
Background technology
Existing inductive load switch circuit as shown in Figure 1, its current characteristics as shown in Figure 2, after the energising, electric current rises to the peak and slowly drops to particular value through modulating, when circuit turn-offs, current direction is: inductance--diode---inductance, the interior damage of electric energy by circuit that remains in the inductance consumes, and it is slower that electric current reduces speed, and the control circuit of fuel oil injection electromagnetic valve etc., but need control circuit electric current when turn-offing to descend rapidly, in time shut off valve.Present switching circuit can't satisfy the needs of fuel oil injection electromagnetic valve, can't accurately control fuel injection time, and distributive value is inaccurate, causes engine running not steady, and noise is big, and mechanical wear is serious, has shortened the useful life of engine.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming, provides a kind of when control circuit turn-offs, the inductive load switch circuit that can turn-off rapidly that the electric current of circuit can descend fast.
The technical solution adopted in the present invention is a kind of inductive load switch circuit that can turn-off rapidly, comprise the inductive load switch circuit of forming by power supply wiring, inductance, diode, semiconductor, its characteristics are: one at power supply wiring extremely is connected to control semiconductor, newly-increased diode, power to inductive load switch circuit by the semi-conductive two ends of control, newly-increased diode one end joins with the control semiconductor, and another of the other end and power supply wiring extremely joins.
Operation principle of the present invention is: when circuit debugging, semiconductor in the primary circuit and newly-increased control semiconductor conducting simultaneously, the current direction of circuit is: positive source--controls semiconductor--inductance--semiconductor in the primary circuit---power cathode, the electric current that flows through inductance rises, to the peak, utilize the semiconductor in the primary circuit to modulate, promptly control the electric current that semi-conductive duty ratio may command in the primary circuit flows through inductance based on the actual application requirements, when the semiconductor in the primary circuit turn-offs, current direction in the circuit is: inductance, and---inductance, electric current are slowly reduced to particular value with former diode--control semiconductor--; When circuit turn-offs, need semiconductor and control semiconductor to turn-off simultaneously, current direction in the circuit is: inductance----positive source--power cathode--newly-increased diode---inductance of the diode in the primary circuit, be equivalent to add the opposite voltage of direction when switching on this moment at the two ends of inductance, the electric energy that remains in the inductance is discharged into power supply rapidly, electric current in the inductance reduces rapidly, and the turn-off time is less than original 1/10th.
The present invention is powered to inductance by the control semiconductor by access control semiconductor and newly-increased diode, in case down circuitry, the energy of inductance passes to power supply by two diodes rapidly, and is absorbed by power supply, thereby the electric current of inductance is descended rapidly.Because the control semiconductor and semiconductor and the diode in newly-increased diode and the primary circuit that add are symmetrical, can select as required respectively as modulation semiconductor or shutoff semiconductor.
Semiconductor is a field effect transistor.The control semiconductor is a controllable power semiconductor, can be field effect transistor or for controllable silicon or for triode or for IGBT or for GTO.
When primary circuit is the multichannel inductive load switch circuit of not working simultaneously, connect the electric current that a control semiconductor and newly-increased diode just can be controlled the multichannel inductance.
Though the invention has the advantages that and change little to primary circuit, increase control semiconductor and diode in only original circuit symmetrically, just can satisfy the control circuit needs of fuel oil injection electromagnetic valve etc.: in stage of modulating, it is slower that electric current reduces speed, in case circuit turn-offs, the electric current of inductance can descend rapidly, turn-off time is less than original 1/10th, and the fuel oil injection electromagnetic valve can in time be closed, and makes it accurate oil spout, engine running is steady, long service life.
Description of drawings
Fig. 1 is the principle schematic of existing inductive load switch circuit
Fig. 2 is the current waveform schematic diagram of primary circuit
Fig. 3 is a principle schematic of the present invention
Fig. 4 is a current waveform schematic diagram of the present invention
Fig. 5 is the principle schematic of the embodiment of the invention 2
Wherein: 2 inductance, 3 diodes, 4 semiconductors, 5 control semiconductors, 6 newly-increased diode 52 inductance 53 diodes 54 semiconductors
Embodiment
Below in conjunction with view the present invention is described in detail
As shown in Figure 3, a kind of inductive load switch circuit that can turn-off rapidly, comprise the inductive load switch circuit of forming by power supply wiring, inductance 2, diode 3, semiconductor 4, semiconductor 4 is a field effect transistor, negative pole end (also can be positive terminal) at power supply wiring is connected to control semiconductor 5, newly-increased diode 6, two ends by control semiconductor 5 power to inductive load switch circuit, and newly-increased diode 6 one ends join the positive terminal of another termination power (negative pole end) with control semiconductor 5.Control semiconductor 5 is a controllable power semiconductor, as: field effect transistor, controllable silicon, triode, IGBT, GTO etc.
Its current characteristics as shown in Figure 4, after the energising, electric current rises to the peak and slowly drops to particular value through modulating, during shutoff, electric current reduces rapidly, the turn-off time is less than original 1/10th.
Its operation principle is: when circuit debugging, semiconductor 4 and 5 conductings simultaneously of control semiconductor, the current direction of circuit is: positive source---control semiconductor 5---inductance 2---semiconductor 4---power cathode, the electric current that flows through inductance rises, to the peak, utilize semiconductor 4 to modulate, the duty of promptly controlling semiconductor 4 based on the actual application requirements recently control flows is crossed the electric current of inductance 2, when semiconductor 4 turn-offs, current direction in the circuit is: the former diode 3---control of inductance 2---semiconductor 5---inductance 2, and electric current is slowly reduced to particular value; When circuit turn-offs, need semiconductor 4 and control semiconductor 5 to be in off state simultaneously, current direction in the circuit is: inductance 2---diode 3---positive source--power cathode---newly-increased diode 6, be equivalent to add the opposite voltage of direction when switching on this moment at the two ends of inductance 2, the electric energy that remains in the inductance 2 is discharged into rapidly in the power supply, and the electric current in the inductance 2 reduces rapidly.
Claims (5)
1, a kind of inductive load switch circuit that can turn-off rapidly, comprise the inductive load switch circuit of forming by power supply wiring, inductance (2), diode (3), semiconductor (4), it is characterized in that, control semiconductor (5), newly-increased diode (6) extremely being connected to of power supply wiring, two ends by control semiconductor (5) power to inductive load switch circuit, newly-increased diode (6) one ends join with control semiconductor (5), and another of the other end and power supply wiring extremely joins.
2, the inductive load switch circuit that can turn-off rapidly according to claim 1, it is characterized in that, positive terminal at power supply wiring also is connected to control semiconductor (5), newly-increased diode (6), two ends by control semiconductor (5) power to inductive load switch circuit, newly-increased diode (6) one ends join with control semiconductor (5), and the negative pole end of the other end and power supply wiring joins.
3, the inductive load switch circuit that can turn-off rapidly according to claim 1 is characterized in that, semiconductor (4) is a field effect transistor.
4, the inductive load switch circuit that can turn-off rapidly according to claim 1 is characterized in that, control semiconductor (5) be a controllable power semiconductor, can be field effect transistor or for controllable silicon or for triode or for IGBT or be GTO.
5, the inductive load switch circuit that can turn-off rapidly according to claim 1 is characterized in that, inductive load switch circuit is the inductive load switch circuit that multichannel is not worked simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610018578 CN101039111A (en) | 2006-03-14 | 2006-03-14 | Inductive load switch circuit capable of switching off quickly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610018578 CN101039111A (en) | 2006-03-14 | 2006-03-14 | Inductive load switch circuit capable of switching off quickly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101039111A true CN101039111A (en) | 2007-09-19 |
Family
ID=38889789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610018578 Pending CN101039111A (en) | 2006-03-14 | 2006-03-14 | Inductive load switch circuit capable of switching off quickly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101039111A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165694A (en) * | 2008-09-23 | 2011-08-24 | 特兰斯夫公司 | Inductive load power switching circuits |
| CN102266620A (en) * | 2010-12-31 | 2011-12-07 | 北京谊安医疗系统股份有限公司 | Valve control device and anesthesia machine |
-
2006
- 2006-03-14 CN CN 200610018578 patent/CN101039111A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165694A (en) * | 2008-09-23 | 2011-08-24 | 特兰斯夫公司 | Inductive load power switching circuits |
| CN102165694B (en) * | 2008-09-23 | 2014-05-28 | 特兰斯夫公司 | Inductive load power switching circuits |
| CN102266620A (en) * | 2010-12-31 | 2011-12-07 | 北京谊安医疗系统股份有限公司 | Valve control device and anesthesia machine |
| CN102266620B (en) * | 2010-12-31 | 2014-02-26 | 北京谊安医疗系统股份有限公司 | Valve control device and anesthesia machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070919 |