CN102081147A - Testing pen capable of displaying direct current and alternating current - Google Patents
Testing pen capable of displaying direct current and alternating current Download PDFInfo
- Publication number
- CN102081147A CN102081147A CN 200910199349 CN200910199349A CN102081147A CN 102081147 A CN102081147 A CN 102081147A CN 200910199349 CN200910199349 CN 200910199349 CN 200910199349 A CN200910199349 A CN 200910199349A CN 102081147 A CN102081147 A CN 102081147A
- Authority
- CN
- China
- Prior art keywords
- direct current
- triode
- power supply
- channel circuit
- current
- 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
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a testing pen capable of displaying direct current and alternating current, which is composed of a detection circuit, an alternating current path circuit and a direct current path circuit, wherein the detection circuit comprises a penholder for detecting and contacting with a power supply, and a resistor for limiting current; the alternating current path circuit comprises a capacitor for obstructing direct current, a triode for a switch, a capacitor for charging and two phase inverters, wherein current enters the base electrode of the triode by the capacitor for obstructing direct current when the detected power supply is in alternating current, and thus the triode is conducted; a red light emitting diode lights; the direct current path circuit comprises one triode for the switch, a resistor and two NAND gates, wherein one NAND gate is controlled by the phase inverter; when the detected power supply is in direct current, the triode is conducted, and high electrical level is output after phase reversal by two NAND gates; and a green light emitting diode lights because of being electrified.
Description
Affiliated technical field
The present invention relates to a kind of test pen, particularly relate to a kind of test pen that can show alterating and direct current.
Background technology
Present existing test pen is when testing power supply, what assign to differentiate that the power supply of being surveyed belongs to interchange or direct current by the display part of observation test pen is the comparison difficulty, particularly light is located by day, and is more difficult by observing the alternating current-direct current attribute of differentiating the power supply of being surveyed.
Summary of the invention
The purpose of this invention is to provide a kind of alternating current-direct current attribute that can clearly show the power supply of surveying, for reaching above-mentioned purpose the technical solution adopted for the present invention to solve the technical problems be: by a detection circuit, a communication channel circuit, a dc channel circuit is formed the test pen that can show alterating and direct current, containing one in detection circuit is used to survey and the penholder that contacts power supply, a resistance that is used for current limliting, one end of described penholder and an end of described resistance are serially connected, the other end class of described penholder is outside naked, the other end of described resistance leads to respectively in communication channel circuit and the dc channel circuit, in described communication channel circuit, contain an electric capacity that is used for stopping direct current, a triode that is used for switch, and electric capacity that is used to charge, a described end that is used for partiting dc capacitor is connected with an end of a resistance of detection circuit, the other end is connected with the base stage of described triode, the collector of described triode is connected with power supply, its emitter is connected with ground through an electric capacity that is used to charge, when the survey power supply be direct current because of the electric capacity effect of stopping direct current is arranged, electric current can not enter the base stage of triode, thereby triode can conducting, when the survey power supply exchanges, electric current enters the base stage of triode through the electric capacity of stopping direct current, thereby triode conducting, and electric capacity charging to being used to charge, in described communication channel circuit, also contain two phase inverters, promptly can be divided into prime phase inverter and back level phase inverter by effect, the input end of utmost point phase inverter is connected with the emitter of described triode before described, its output terminal is connected with the input end of described back level phase inverter, in described communication channel circuit, also contain one be used to show the power supply of surveying for exchanging the red light emitting diodes of attribute, its positive pole through a current-limiting resistance with after the level phase inverter output terminal be connected, its minus earth, when the survey power supply was interchange, red light emitting diodes can be shinny.
In described dc channel circuit, contain a triode that is used for switch, a resistance, the base stage of described triode directly is connected with a end of a resistance in the detection circuit, its collector is connected with power supply, emitter is connected with ground through a described resistance, in described dc channel circuit, also contain two Sheffer stroke gates, promptly can be divided into prime Sheffer stroke gate and back level Sheffer stroke gate by effect, an input end of described prime Sheffer stroke gate and the emitter of described triode are connected, and the output terminal of the prime phase inverter in another input end and the communication channel circuit is connected, be the control that the output of prime Sheffer stroke gate is subjected to the prime phase inverter in the communication channel circuit, the output terminal of described prime Sheffer stroke gate is connected with two input ends of back level Sheffer stroke gate, in described dc channel circuit, also contain one and be used to show that the power supply of surveying is the green LED of direct current attribute, its positive pole through a current-limiting resistance with after the level Sheffer stroke gate output terminal be connected, its minus earth, when the survey power supply was direct current, green LED can be shinny.
Working method of the present invention is; When the survey power supply is direct current, electric current can not enter communication channel circuit, red light emitting diodes does not work because of there being electricity, and this moment, the electric current of surveying can only enter dc channel circuit, so triode conducting in the dc channel circuit, prime Sheffer stroke gate output low level, through after the anti-phase back output high level of level Sheffer stroke gate, green LED gets electric and shinny, when the survey power supply is interchange, electric current enter simultaneously in the dc channel circuit and communication channel circuit in, triode conducting simultaneously in the alternating current-direct current passage circuit, so prime phase inverter output low level, this low level are added on the input end on the prime Sheffer stroke gate, force prime Sheffer stroke gate output high level, this high level through after the anti-phase back of level Sheffer stroke gate output low level, green LED does not work because of there being electricity, and the low level of prime phase inverter output is through the anti-phase back output of back level phase inverter high level on the other hand, and red light emitting diodes is electric and shinny because of getting.
The invention has the beneficial effects as follows; According to the shinny situation of red and green luminous diode, can be easy to differentiate the attribute of the alternating current-direct current of the power supply of surveying, promptly the shinny power supply of surveying of red light emitting diodes is an alternating current, the shinny power supply of surveying of green LED is a direct current.
Description of drawings
Accompanying drawing is the circuit connection diagram that can show the test pen of alterating and direct current of the present invention
Embodiment
To narrate embodiment of the present invention particularly with reference to accompanying drawing, detection circuit 1 shown in the drawings, communication channel circuit 2, dc channel circuit 3, penholder 4, resistance 5,10,15,17, electric capacity 6,8, triode 7,9, phase inverter 11,12, Sheffer stroke gate 13,14, red light emitting diodes 16, green LED 18, the annexation of power supply 19.
By a detection circuit 1, a communication channel circuit 2, a dc channel circuit 3 is formed the test pen that can show alterating and direct current, containing one in detection circuit 1 is used to survey and the penholder 4 that contacts power supply, a resistance 5 that is used for current limliting, one end of penholder 4 and an end of resistance 5 are serially connected, and the other end class of penholder 4 is outside naked, and the other end of resistance 5 leads to respectively in communication channel circuit 2 and the dc channel circuit 3.In communication channel circuit 2, contain an electric capacity 6 that is used for stopping direct current, a triode 7 that is used for switch, and electric capacity that is used to charge 8, one end of electric capacity 6 is connected with an end of resistance 5, the other end is connected with the base stage of triode 7, the collector of triode 7 is connected with power supply 19, its emitter is connected with ground through electric capacity 8, when the survey power supply is electric capacity 8 effects because of stopping direct current is arranged of direct current, electric current can not enter the base stage of triode 7, thereby triode 7 can conducting, when the survey power supply exchanges, electric current enters the base stage of triode 7 through the electric capacity 6 of stopping direct current, thereby triode 7 conductings, and to electric capacity 8 chargings, 2 also contain two phase inverters 11 in communication channel circuit, 12, the input end of phase inverter 11 is connected with the emitter of triode 7, its output terminal is connected with the input end of phase inverter 12, in communication channel circuit 2, also contain a red light emitting diodes 16, its positive pole is connected through the output terminal of resistance 15 with phase inverter 12, its minus earth, when the survey power supply was interchange, red light emitting diodes 16 can be shinny.
In dc channel circuit 3, contain a triode 9 that is used for switch, a resistance 10, the base stage of triode 9 directly is connected with an end of resistance 5, its collector is connected with power supply 19, emitter is connected with ground through resistance 10, in dc channel circuit 3, also contain two Sheffer stroke gates 13,14, the input end of Sheffer stroke gate 13 and the emitter of triode 9 are connected, and the output terminal of another input end and phase inverter 11 is connected, be the control that the output of Sheffer stroke gate 13 is subjected to phase inverter 11, two input ends of the output terminal of Sheffer stroke gate 13 and Sheffer stroke gate 14 are connected, also contain a green LED 18 in the dc channel circuit 3, its positive pole is connected through the output terminal of resistance 17 with Sheffer stroke gate 14, its minus earth, when the survey power supply was direct current, green LED 18 can be shinny.Principle of work of the present invention is narrated in summary of the invention, does not chat tired at this.
Claims (3)
1. the test pen that can show alterating and direct current is characterized in that: form the test pen that can show alterating and direct current by 2, one dc channel circuits of a communication channel circuit 3.
2. according to claim 1ly in communication channel circuit 2, contain an electric capacity 6 that is used for stopping direct current, a triode 7 that is used for switch, and electric capacity that is used to charge 8, one end of electric capacity 6 is connected with an end of resistance 5, the other end is connected with the base stage of triode 7, the collector of triode 7 is connected with power supply 19, and its emitter is connected with ground through electric capacity 8.
3. according to also containing two Sheffer stroke gates 13,14 in claims 1 described dc channel circuit 3, the input end of Sheffer stroke gate 13 and the emitter of triode 9 are connected, and the output terminal of another input end and phase inverter 11 is connected, i.e. the output of Sheffer stroke gate 13 is subjected to the control of phase inverter 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910199349 CN102081147A (en) | 2009-11-26 | 2009-11-26 | Testing pen capable of displaying direct current and alternating current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910199349 CN102081147A (en) | 2009-11-26 | 2009-11-26 | Testing pen capable of displaying direct current and alternating current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102081147A true CN102081147A (en) | 2011-06-01 |
Family
ID=44087224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910199349 Pending CN102081147A (en) | 2009-11-26 | 2009-11-26 | Testing pen capable of displaying direct current and alternating current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102081147A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999009A (en) * | 2012-12-11 | 2013-03-27 | 深圳市麦格米特驱动技术有限公司 | Control circuit of machine tool |
| CN104459282A (en) * | 2014-12-11 | 2015-03-25 | 柳州铁道职业技术学院 | Multifunctional circuit testing electroprobe |
| CN104569858A (en) * | 2015-02-11 | 2015-04-29 | 山东诺安诺泰信息系统有限公司 | Direct-current power supply quality visual detector |
| CN110907847A (en) * | 2019-11-12 | 2020-03-24 | 深圳龙电电气股份有限公司 | Power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire |
-
2009
- 2009-11-26 CN CN 200910199349 patent/CN102081147A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102999009A (en) * | 2012-12-11 | 2013-03-27 | 深圳市麦格米特驱动技术有限公司 | Control circuit of machine tool |
| CN102999009B (en) * | 2012-12-11 | 2016-01-20 | 深圳市麦格米特驱动技术有限公司 | Control circuit of machine tool |
| CN104459282A (en) * | 2014-12-11 | 2015-03-25 | 柳州铁道职业技术学院 | Multifunctional circuit testing electroprobe |
| CN104569858A (en) * | 2015-02-11 | 2015-04-29 | 山东诺安诺泰信息系统有限公司 | Direct-current power supply quality visual detector |
| CN110907847A (en) * | 2019-11-12 | 2020-03-24 | 深圳龙电电气股份有限公司 | Power supply detection circuit and method compatible with three-phase three-wire and three-phase four-wire |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104698262B (en) | A kind of zero cross detection circuit and convertible frequency air-conditioner | |
| CN103336235A (en) | IGBT condition detection circuit | |
| CN203299316U (en) | Line sequence detector | |
| CN102081147A (en) | Testing pen capable of displaying direct current and alternating current | |
| CN202548267U (en) | Circuit for detecting live wire and zero wire | |
| CN114137381B (en) | Avalanche parameter measurement system | |
| CN102445591A (en) | Electric test pen capable of judging alternating current and direct current | |
| CN204556715U (en) | A kind of zero cross detection circuit and convertible frequency air-conditioner | |
| CN104022563B (en) | The double cell group commutation circuit of electric vehicle | |
| CN201196666Y (en) | Power supply polarity discriminator | |
| CN103364675A (en) | Wire disconnection detecting circuit and wire disconnection detecting device | |
| CN204067750U (en) | A kind of leakage protecting plug | |
| CN204694803U (en) | A kind of portable circuit trip point pick-up unit | |
| CN203350393U (en) | Communication cable testing device | |
| CN102820789B (en) | Alternating-current zero line and firing line identification and conversion circuit | |
| CN102385000B (en) | Zero crossing detection circuit of electric meter system | |
| CN104122481A (en) | Multifunction cable detection device | |
| CN203825134U (en) | Device for detecting flat cable welding sequence of lithium battery protection board | |
| CN103311961A (en) | Charger indicating lamp circuit | |
| CN104079023B (en) | A kind of charging indicator light control circuit and charger | |
| CN202494714U (en) | Novel electroscope | |
| CN204719123U (en) | A kind of overvoltage undervoltage detection circuit | |
| CN203537638U (en) | Safe light-emitting circuit | |
| CN102904312A (en) | Charger for automatically judging polarity of charge pole of electric vehicle and judging method thereof | |
| CN202535574U (en) | Charging indication lamp circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110601 |