CN87102142A - Automatically protected driving circuit - Google Patents
Automatically protected driving circuit Download PDFInfo
- Publication number
- CN87102142A CN87102142A CN 87102142 CN87102142A CN87102142A CN 87102142 A CN87102142 A CN 87102142A CN 87102142 CN87102142 CN 87102142 CN 87102142 A CN87102142 A CN 87102142A CN 87102142 A CN87102142 A CN 87102142A
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- protection
- driving circuit
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Abstract
The invention belongs to the mimic channel field.The output that can be used for various pick-up units drives.The present invention has increased output overload protection circuit in driving circuit, power polar protective circuit makes entire circuit safe and reliable, can not damage circuit because exporting overload or electric power polarity wrong.
The present invention is widely used, and can be used in various sniffers, the automatic control as driving circuit.The designed circuit of the present invention is particularly suitable for manufacturing integrated circuit.
Description
The invention belongs to the mimic channel field, the output that can be used for various pick-up units drives.
Existing driving circuit only considers how to drive load, but does not establish protective device, therefore increase in load, and driving circuit output short-circuit or electric power polarity wrong, driving circuit is easily damaged.
The present invention is directed to the shortcoming of above-mentioned driving circuit, carried out brand-new design, purpose is to obtain a kind of driving circuit, when load increase or output terminal short circuit, can not damage by automatic protection circuit.
Fig. 1 is a block scheme of the present invention.
Fig. 2 is an enforcement circuit 1 of the present invention.
Fig. 3 is an enforcement circuit 2 of the present invention.
Principle of the present invention is to utilize the reaction type resist technology, limits output current so that output under overload situations, utilizes amplifying device to be in cut-off state. In circuit, set up the polarity protection device, so that add in the wrong situation in the polarity of DC voltage, also can not damage circuit.
When being input as low level among Fig. 1, input is amplified (1) and is ended, and makes output drive (2) and ends, and is output as low level.When being input as high level, (1) conducting is amplified in input, makes output drive (2) conducting, is output as high level.When output overloads,, make input amplify (1) and end, end thereby make output drive (2), thereby under the overload situation, protect this circuit by feedback protection (3).Exporting to drive protects (4) to make the voltage that is added in the output driving (2) be unlikely above permissible value.Polarity protection (5) makes supply voltage polarity add and staggers the time, is unlikely the damage circuit.
Further set forth the present invention at embodiment Fig. 2 below, input end is when low level, and triode BG1, BG2, BG3 and BG4 are in cut-off state, and output is in low level.When input end adds high level (〉=2
V) time, BG1 conducting, I are amplified in input
ElThrough current-limiting resistance R
1With speed-up capacitor C
1To C
2Charging, the BG1 collector produces a negative pulse, capacitor C
1And C
2Make the width of negative pulse be enough to make output to drive BG2 by saturated by entering, after BG2 was saturated, collector potential raise, the output high level, and make the two-stage of feedback protection circuit amplify BG3 and BG4 conducting, I is given in the BG4 conducting
ElAnd capacitor C
2Discharge provides path.
During the output overload, the output terminal current potential reduces, and feedback protection circuit BG3 and BG4 end, and make I
ElReduce, cause the BG1 collector voltage to raise, BG2 is ended, be output as low level, protect entire circuit with this, stabilivolt DW1 constitutes output and drives protection, and the voltage that is added on the BG2 is unlikely above permissible value.Diode D
9Constitute polarity protection, diode D
7Constitute the polarity protection of feedback protection circuit, diode D
1, D
2And D
3Clamper is carried out in input, diode D
4, D
5And D
6And constant current current limiting tube D
11Bias voltage is provided for the base stage of BG3.Constant current current limiting tube D
10And resistance R
5When the BG3 conducting, provide bias voltage to BG4.
The embodiment 2 of Fig. 3 can in like manner be pushed away by embodiment 1, and the difference between them only is the exchange between triode NPN and the PNP, so all corresponding conversion in structure of the polarity of corresponding protection circuit diode and biasing circuit diode.
The present invention is particularly suitable for utilizing integrated technology to manufacture integrated circuit.
The present invention is widely used, and can be used in various detections, detection and the automation field, as the driving circuit that detects behind the signal.Owing to designed holding circuit in circuit, therefore, the external connection end misconnection of entire circuit or output terminal overload all can not damage this circuit.This circuit outputting current steadily.
The device value of embodiment 2 and embodiment 1 is except that the triode model is different, and all the other devices are all identical, so embodiment 2 just lists the triode model.
Embodiment 1:
R
1：1K，R
2：1M，R
3：3K，R
5：12K，D
10＝D
11：2DHO39A，D
1＝D
2＝D
3＝D
4＝D
5＝D
6：2CP10，DW1：40V，D
7：2CK82，D
9：IN4001，BG1：3DK7A，BG2：3CK9F，BG3：3CK，BG4：3DK。
Embodiment 2:
BG1：3CK7，BG2：3DK9F，BG3：3CK2，BG4：3DK。
Claims (4)
1, amplifies by input and output drives the driving circuit that constitutes, it is characterized in that having feedback protection in the formation of circuit, output drives protection and polarity protection.
2, feedback protection according to claim 1 is characterized in that feedback protection is to amplify BG3, BG4, diode D by two-stage
4, D
5, D
6And D
7, constant current restrictor D
10And D
11, resistance R
5Constitute.
3, output according to claim 1 drives protection, it is characterized in that it is to be made of stabilivolt DW1 that output drives protection.
4, polarity protection according to claim 1 is characterized in that polarity protection is by diode D
9Constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102142 CN87102142A (en) | 1987-05-12 | 1987-05-12 | Automatically protected driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102142 CN87102142A (en) | 1987-05-12 | 1987-05-12 | Automatically protected driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87102142A true CN87102142A (en) | 1988-11-30 |
Family
ID=4813838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87102142 Pending CN87102142A (en) | 1987-05-12 | 1987-05-12 | Automatically protected driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87102142A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909383A (en) * | 2009-06-02 | 2010-12-08 | 海洋王照明科技股份有限公司 | Over-voltage locking protection circuit and power drive circuit using same |
| CN103217615A (en) * | 2013-03-27 | 2013-07-24 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
-
1987
- 1987-05-12 CN CN 87102142 patent/CN87102142A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909383A (en) * | 2009-06-02 | 2010-12-08 | 海洋王照明科技股份有限公司 | Over-voltage locking protection circuit and power drive circuit using same |
| CN101909383B (en) * | 2009-06-02 | 2013-04-17 | 海洋王照明科技股份有限公司 | Over-voltage locking protection circuit and power drive circuit using same |
| CN103217615A (en) * | 2013-03-27 | 2013-07-24 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
| CN103217615B (en) * | 2013-03-27 | 2015-03-25 | 上海贝岭股份有限公司 | Output short-circuit detection circuit |
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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 | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |