CN104682342A - Over-voltage protection circuit of testing host computer - Google Patents
Over-voltage protection circuit of testing host computer Download PDFInfo
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- CN104682342A CN104682342A CN201310639935.XA CN201310639935A CN104682342A CN 104682342 A CN104682342 A CN 104682342A CN 201310639935 A CN201310639935 A CN 201310639935A CN 104682342 A CN104682342 A CN 104682342A
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- diode
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Abstract
The invention discloses an over-voltage protection circuit of a testing host computer. The over-voltage protection circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, an LED (Light Emitting Diode), a triode, a relay, a three-terminal voltage stabilizer and a bridge rectifier circuit, wherein two alternating-current input ends of the bridge rectifier circuit are respectively connected with an anode and a cathode of mains supply, and the anode output end of the bridge rectifier circuit is respectively connected with the first capacitor and the input end of the three-terminal voltage stabilizer. According to the over-voltage protection circuit of the testing host computer, disclosed by the invention, over-voltage protection is completed by adopting the diodes and the triode, the first diode can be subjected to reverse breakdown if the voltage is too high after the mains supply is subjected to voltage stabilizing by the three-terminal voltage stabilizer, the voltage can be loaded to a base electrode of the triode after the mains supply is subjected to voltage reduction by the second resistor, thus the triode is switched on, meanwhile, the relay is switched on, a normally closed contact switch of the relay is switched off, the testing host computer is in power failure, and the testing host computer is protected from being damaged by the voltage which is increased suddenly.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly relate to a kind of overvoltage crowbar of Test Host.
Background technology
Software test describes a kind of correctness being used for promoting qualification software, integrality, the process of fail safe and quality, under defined terms, program is operated, with discovery procedure mistake, weigh software quality, and to its process assessed that whether can meet design requirement, software test is the process using artificial or automatic means to run or test certain system, its object is to the difference checked the demand of its whether satisfied regulation or understand fully between expected results and actual result, it is the correctness (correctness) helping the computer software (in whole or in part) identifying that exploitation completes (middle or final version), spend the software process of (completeness) and quality (quality) completely, it is the important subdomain of SQA (softwarequalityassurance), when the intermediate releases of the software developed is tested on Test Host, because software is imperfect, the overfrequencies such as the CPU of Test Host and hard disk may be caused or run up, also Test Host power consumption may be caused to increase suddenly, in the case, need to carry out voltage stabilizing by stabilized voltage power supply to Test Host, ensure its normal operating voltage, if but there is larger fluctuation in civil power, there is the high voltage exceeding the scope of voltage stabilizing circuit, Test Host is made to accept suddenly larger voltage and cause irreversible damage.
Summary of the invention
Object of the present invention is just the overvoltage crowbar providing a kind of Test Host in order to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of overvoltage crowbar of Test Host, comprise the first resistance to the 3rd resistance, first electric capacity is to the 4th electric capacity, first diode, second diode, light-emitting diode, triode, relay, three terminal regulator and bridge rectifier, two ac input ends of described bridge rectifier are connected with described civil power both positive and negative polarity respectively, the cathode output end of described bridge rectifier is connected with the input of described first electric capacity and described three terminal regulator respectively, the output of described three terminal regulator respectively with the negative pole of described first diode, the positive pole of described light-emitting diode, the first end of described relay, the negative pole of described second diode, the described first end of the 4th electric capacity is connected with the first end of the normally-closed contact switch of described relay, the voltage stabilizing end of described three terminal regulator is connected with the first end of described second electric capacity and the first end of described first resistance respectively, the positive pole of described first diode is connected with the first end of described second resistance, second end of described second resistance is connected with the described first end of the 3rd electric capacity and the base stage of described triode respectively, the negative pole of described light-emitting diode is connected with the first end of described 3rd resistance, second end of described 3rd resistance respectively with the second end of described relay, the positive pole of described second diode is connected with the collector electrode of described triode, the cathode output end of described bridge rectifier respectively with the second end of described first electric capacity, second end of described second electric capacity, second end of described first resistance, second end of described 3rd electric capacity, the emitter of described triode is connected with the second end of described 4th electric capacity, the cathode output end of described bridge rectifier is the cathode output end of the overvoltage crowbar of described Test Host, second end of the normally-closed contact switch of described relay is the cathode output end of the overvoltage crowbar of described Test Host.
Beneficial effect of the present invention is:
The overvoltage crowbar of a kind of Test Host of the present invention adopts diode and triode to complete overvoltage protection; when civil power is after three terminal regulator voltage stabilizing; if overtension, the first diode is reversed and punctures, then after the second resistance step-down; voltage-drop loading is to transistor base; make triode ON, simultaneously relay conducting, the normally-closed contact switch of relay disconnects; make Test Host power-off, relay testing main frame is not damaged by the voltage raised suddenly.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the overvoltage crowbar of a kind of Test Host of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the overvoltage crowbar of a kind of Test Host of the present invention, comprise the first resistance R1 to the 3rd resistance R3, first electric capacity C1 is to the 4th electric capacity C4, first diode D1, second diode D2, LED, triode T, relay K, three terminal regulator IC and bridge rectifier BR, two ac input ends of bridge rectifier BR are connected with civil power both positive and negative polarity respectively, the cathode output end of bridge rectifier BR is connected with the input of the first electric capacity C1 and three terminal regulator IC respectively, the output of three terminal regulator IC respectively with the negative pole of the first diode D1, the positive pole of LED, the first end of relay K, the negative pole of the second diode D2, the first end of the 4th electric capacity C4 is connected with the first end of the normally-closed contact K switch-1 of relay K, the voltage stabilizing end of three terminal regulator IC is connected with the first end of the second electric capacity C2 and the first end of the first resistance R1 respectively, the positive pole of the first diode D1 is connected with the first end of the second resistance R2, second end of the second resistance R2 is connected with the first end of the 3rd electric capacity C3 and the base stage of triode T respectively, the negative pole of LED is connected with the first end of the 3rd resistance R3, second end of the 3rd resistance R3 respectively with the second end of relay K, the positive pole of the second diode D2 is connected with the collector electrode of triode T, the cathode output end of bridge rectifier BR respectively with second end of the first electric capacity C1, second end of the second electric capacity C2, second end of the first resistance R1, second end of the 3rd electric capacity C3, the emitter of triode T is connected with second end of the 4th electric capacity C4, the cathode output end of bridge rectifier BR is the cathode output end of the overvoltage crowbar of Test Host, second end of the normally-closed contact K switch-1 of relay K is the cathode output end of the overvoltage crowbar of Test Host.
The operation principle of the overvoltage crowbar of a kind of Test Host of the present invention is as follows:
The model of three terminal regulator IC is 7812; the overvoltage crowbar of Test Host adopts diode and triode T to complete overvoltage protection, when civil power is after three terminal regulator IC voltage stabilizing, if overtension; first diode D1 is reversed and punctures; again after the second resistance R2 step-down, voltage-drop loading, to triode T base stage, makes triode T conducting; relay K conducting simultaneously; the normally-closed contact K switch-1 of relay K disconnects, and make Test Host power-off, relay testing main frame is not damaged by the voltage raised suddenly.
Claims (1)
1. the overvoltage crowbar of a Test Host, it is characterized in that: comprise the first resistance to the 3rd resistance, first electric capacity is to the 4th electric capacity, first diode, second diode, light-emitting diode, triode, relay, three terminal regulator and bridge rectifier, two ac input ends of described bridge rectifier are connected with described civil power both positive and negative polarity respectively, the cathode output end of described bridge rectifier is connected with the input of described first electric capacity and described three terminal regulator respectively, the output of described three terminal regulator respectively with the negative pole of described first diode, the positive pole of described light-emitting diode, the first end of described relay, the negative pole of described second diode, the described first end of the 4th electric capacity is connected with the first end of the normally-closed contact switch of described relay, the voltage stabilizing end of described three terminal regulator is connected with the first end of described second electric capacity and the first end of described first resistance respectively, the positive pole of described first diode is connected with the first end of described second resistance, second end of described second resistance is connected with the described first end of the 3rd electric capacity and the base stage of described triode respectively, the negative pole of described light-emitting diode is connected with the first end of described 3rd resistance, second end of described 3rd resistance respectively with the second end of described relay, the positive pole of described second diode is connected with the collector electrode of described triode, the cathode output end of described bridge rectifier respectively with the second end of described first electric capacity, second end of described second electric capacity, second end of described first resistance, second end of described 3rd electric capacity, the emitter of described triode is connected with the second end of described 4th electric capacity, the cathode output end of described bridge rectifier is the cathode output end of the overvoltage crowbar of described Test Host, second end of the normally-closed contact switch of described relay is the cathode output end of the overvoltage crowbar of described Test Host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310639935.XA CN104682342A (en) | 2013-12-02 | 2013-12-02 | Over-voltage protection circuit of testing host computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310639935.XA CN104682342A (en) | 2013-12-02 | 2013-12-02 | Over-voltage protection circuit of testing host computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104682342A true CN104682342A (en) | 2015-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310639935.XA Pending CN104682342A (en) | 2013-12-02 | 2013-12-02 | Over-voltage protection circuit of testing host computer |
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| CN (1) | CN104682342A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253233A (en) * | 2016-09-30 | 2016-12-21 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage regulating circuit |
| CN106300245A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage is adjustable cut off circuit |
| CN106301035A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Overvoltage filter control circuit for Intelligent clothes cabinet |
| CN106329481A (en) * | 2016-09-30 | 2017-01-11 | 成都烨辰新材料科技有限公司 | Overvoltage control circuit for intelligent wardrobe |
| CN110259620A (en) * | 2019-06-27 | 2019-09-20 | 浙江吉利控股集团有限公司 | Over-pressure safety device, ignition system and vehicle for engine igniting system |
-
2013
- 2013-12-02 CN CN201310639935.XA patent/CN104682342A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253233A (en) * | 2016-09-30 | 2016-12-21 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage regulating circuit |
| CN106300245A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage is adjustable cut off circuit |
| CN106301035A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Overvoltage filter control circuit for Intelligent clothes cabinet |
| CN106329481A (en) * | 2016-09-30 | 2017-01-11 | 成都烨辰新材料科技有限公司 | Overvoltage control circuit for intelligent wardrobe |
| CN110259620A (en) * | 2019-06-27 | 2019-09-20 | 浙江吉利控股集团有限公司 | Over-pressure safety device, ignition system and vehicle for engine igniting system |
| CN110259620B (en) * | 2019-06-27 | 2021-05-25 | 浙江吉利控股集团有限公司 | Overvoltage protection device for engine ignition system, ignition system and vehicle |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150603 |