CN202443069U - Monitoring circuit for contact quality of neutral electrode - Google Patents
Monitoring circuit for contact quality of neutral electrode Download PDFInfo
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- CN202443069U CN202443069U CN2012200649935U CN201220064993U CN202443069U CN 202443069 U CN202443069 U CN 202443069U CN 2012200649935 U CN2012200649935 U CN 2012200649935U CN 201220064993 U CN201220064993 U CN 201220064993U CN 202443069 U CN202443069 U CN 202443069U
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Abstract
The utility model relates to a monitoring circuit for the contact quality of a neutral electrode, which comprises a sampling circuit used for collecting the magnitude of the contact impedance of a neutral electrode, wherein the output end of the sampling circuit is connected with the input end of a control circuit, the output end of the control circuit is respectively connected with a warning circuit and a display circuit used for displaying the contact quality of the neutral electrode, and a power supply circuit is used for respectively supplying power to the sampling circuit and the control circuit. According to the monitoring circuit for the contact quality of the neutral electrode, the magnitude of the contact impedance of the neutral electrode is collected by the sampling circuit, a collected signal is also transmitted to the control circuit, and the display circuit is controlled to display a corresponding state by the control circuit according to the magnitude of the contact impedance of the neutral electrode. In this way, an intuitive and reliable relationship is constructed for the contact quality and the display circuit, and the level of the contact quality of the neutral electrode can be responded by the state displayed by the display circuit.
Description
Technical field
The utility model relates to a kind of observation circuit, especially a kind of neutral electrode contact quality observation circuit.
Background technology
At present; The monitoring of the excellent situation of neutral electrode contact quality is all adopted basically the mode of sound and light alarm; That is: contact---is not reported to the police, is not contacted---and reports to the police, and the observation circuit of this sound and light alarm formula is realized easily; Yet its intrinsic drawback is arranged also: how on earth the contact quality situation that can't reflect neutral electrode intuitively possibly exist potential safety hazard if contact is bad.
The utility model content
Whether the purpose of the utility model is to provide a kind of neutral electrode of not only can monitoring to contact, and can also monitor and intuitively show the neutral electrode contact quality observation circuit of its contact quality situation.
For realizing above-mentioned purpose; The utility model has adopted following technical scheme: a kind of neutral electrode contact quality observation circuit; Comprise the big or small sample circuit of contact impedance that is used to gather neutral electrode; The output terminal of sample circuit links to each other with the input end of control circuit, the output terminal of control circuit respectively with warning circuit, be used to show that the display circuit of neutral electrode contact quality links to each other, power circuit is respectively to the power supply of sample circuit, control circuit.
Can know by technique scheme; The contact impedance that the utility model is gathered neutral electrode through sample circuit is big or small, and the signal that collects is sent to control circuit, by the size of control circuit according to the contact impedance of neutral electrode; The control display circuit shows corresponding state; Like this, contact quality has just been set up intuitively with display circuit, has been concerned that reliably the state that display circuit showed just can reflect the quality of neutral electrode contact quality.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
A kind of neutral electrode contact quality observation circuit; Comprise the big or small sample circuit 1 of contact impedance that is used to gather neutral electrode; The output terminal of sample circuit 1 links to each other with the input end of control circuit 2; The output terminal of control circuit 2 respectively with warning circuit, be used to show that the display circuit 3 of neutral electrode contact quality links to each other, power circuit 4 is respectively to 2 power supplies of sample circuit 1, control circuit, and is as shown in Figure 1.Described power circuit 4 comprises voltage follower U5A; Its power supply termination+9V direct current; Its positive input links to each other with adjustable resistance R29, links to each other with an end of resistance R 32 after its inverting input links to each other with its output terminal, and the other end of resistance R 32 links to each other with the inverting input of amplifier U5B; The output terminal of amplifier U5B links to each other with the anode of diode D1, and the negative electrode of diode D1 links to each other with the input end of control circuit 2.
As shown in Figure 1; Described sample circuit 1 comprises the first phase inverter U3F; Its input end receives the square-wave signal of 39kHz; Its output terminal links to each other the other end ground connection of resistance R 37, the source ground of FET Q10 with the input end of the second phase inverter U3A, an end of resistance R 37, the grid of FET Q10, the grid of FET Q11 respectively; The output terminal of the second phase inverter U3A links to each other with an end of resistance R 38, the grid of FET Q9, the grid of FET Q12 respectively; The other end ground connection of resistance R 38, the source ground of FET Q12 links to each other with the output node TP1 of power circuit 4 after the drain electrode of FET Q9 links to each other with the drain electrode of FET Q11; The source electrode of FET Q9 links to each other with the drain electrode of FET Q10, an end of resistance R 35 respectively; The source electrode of FET Q11 links to each other with the drain electrode of FET Q12, an end of resistance R 36 respectively, and resistance R 35, R36 connect the two ends of the secondary coil of isolating transformer T3 respectively, and the primary coil of isolating transformer T3 links to each other with neutral electrode to be monitored.
As shown in Figure 1; Described control circuit 2 comprises control chip U8, and control chip U8 adopts the LM3914 chip, and its 5th pin is through resistance R 30 ground connection; And link to each other with the output node COM of power circuit 4 through resistance R 29; The 6th, 7 pins of LM3914 chip link to each other with an end of resistance R 15 after linking to each other, and the 2nd, 4,8 pins of LM3914 chip link to each other the 2nd pin ground connection of LM3914 chip after linking to each other with the other end of resistance R 15; The 3rd, 9 pins of LM3914 chip all meet power supply VCC; The 1st, 10,11,12,13,14,15,16,17,18 pins of LM3914 chip link to each other with the input end of display circuit 3, and the 12nd pin of LM3914 chip links to each other with the input end of phase inverter U3D, and the output terminal of phase inverter U3D links to each other with warning circuit; Described display circuit 3 comprises LED 1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10; The equal ground connection of its negative electrode; Its anode links to each other with the output terminal of control circuit 2, an end of current-limiting resistance 5 respectively, and the other end of current-limiting resistance 5 all meets power supply VCC.Current-limiting resistance 5 can be protected light emitting diode, and the LM3914 chip is controlled the open and close of 10 light emitting diodes through the variation of the 5th pin voltage.
As shown in Figure 1, the anode of described LED 1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10 links to each other with the 1st, 18,17,16,15,14,13,12,11,10 pins of LM3914 chip respectively.Represent the contact quality of neutral electrode to be monitored with 10 LEDs, the LED lamp of lighting is many more, representes that then contact quality is good more; When having at least 3 LED lamps to be lighted, represent that neutral electrode contact quality to be monitored is reliable; Light the LED lamp and reach more than 9 or 9, represent neutral electrode possibility short circuit to be monitored, or adopted the neutral electrode that to monitor, can reflect very intuitively that so just the contact quality of neutral electrode is also in time pinpointed the problems.
Below in conjunction with Fig. 1 the utility model is further described.
+ 9V dc voltage gets into the 3rd pin of voltage follower U5A through resistance R 28, R29; Voltage of the 1st pin output from voltage follower U5A; The voltage of the 1st pin changes with the voltage of the 3rd pin; What the voltage-regulation of the 3rd pin was leaned on is to regulate resistance R 29, can adjust the input voltage of voltage follower U5A the 3rd pin through regulating resistance R 29, thereby change the output voltage of the 1st pin; Can make the output of voltage follower U5A the 1st pin more stable like this, and load capacity can strengthen.From the voltage of the voltage of the 1st pin of voltage follower U5A output and node TP1 through amplifier U5B, through amplifying after the back passes through diode D1 correction direct current direction, through the 5th pin of resistance R 29 step-downs supply LM3914 chip.Capacitor C 19, C20, C21, C22, C23, C24 play the jamming-proof effect of filtering.
The square-wave signal of 39kHz is successively through linking to each other with FET Q10, Q12 respectively behind phase inverter U3F, the U3A.The field effect bridge that FET Q9, Q10, Q11, Q12 form by+9V direct current through resistance R 27, the power supply of R31 dividing potential drop; The 39kHz square-wave signal drives the field effect bridge through phase inverter U3F, U3A adjustment; The field effect bridge is exported signal through resistance R 35, R36, and T3 is coupled through isolating transformer, meets BD1 through resistance R 39; Another termination BD2, the i.e. two ends of neutral electrode.
The situation of neutral electrode contact quality shows as the variation of impedance between BD1, the BD2, and the impedance bright contact of novel more is good more, i.e. the variation of the load of field effect bridge amplifying circuit.The diminish load of field effect bridge amplifying circuit then of impedance becomes big, and the electric current between node TP1 and the FET Q9 will become greatly, then resistance R 27 minutes the voltage increase, the current potential step-down of node TP1.When the 6th pin voltage of amplifier U5B fixedly the time, the voltage of its 5th pin changes with the variation of load.After the voltage process amplifier U5B of node TP1, the diode D1 correcting current direction; Supply with LM3914 chip the 5th pin through resistance R 29 step-downs; Voltage changes with the variation of load; So the number of the light emitting diode that the LM3914 chip controls is lighted is the variation of the light emitting diode number that the variation of final load can cause being lighted.Load heavily is that the contact impedance of neutral electrode is little, and the voltage of LM3914 chip the 5th pin is little, and this moment, the number of the LED that the control of LM3914 chip the 5th pin is lighted was just many, and the height contact quality of load has just been set up relation with the lamp number of lighting like this.
10 LEDs are lighted by the LM3914 chip controls and are extinguished; Between LED 8 and current-limiting resistance 5, be connected to phase inverter U3D again; When LED 8 is lighted; Explain that the neutral electrode contact quality is good, through phase inverter U3D acquired signal and feed back to warning circuit, do not report to the police; Otherwise, when LED 8 is not lighted, neutral electrode not contact or loose contact being described, phase inverter U3D gathers less than information, and warning circuit just can not receive feedback information, reports to the police.
In a word; The contact impedance that the utility model is gathered neutral electrode through sample circuit 1 is big or small, and the signal that collects is sent to control circuit 2, by the size of control circuit 2 according to the contact impedance of neutral electrode; The corresponding state of diode displaying in the control display circuit 3; Like this, contact quality has just been set up intuitively with display circuit 3, has been concerned that reliably the state that display circuit 3 is shown just can reflect the quality of neutral electrode contact quality.
Claims (5)
1. neutral electrode contact quality observation circuit; It is characterized in that: comprise the big or small sample circuit (1) of contact impedance that is used to gather neutral electrode; The output terminal of sample circuit (1) links to each other with the input end of control circuit (2); The output terminal of control circuit (2) respectively with warning circuit, be used to show that the display circuit (3) of neutral electrode contact quality links to each other, power circuit (4) is respectively to the power supply of sample circuit (1), control circuit (2).
2. neutral electrode contact quality observation circuit according to claim 1; It is characterized in that: described sample circuit (1) comprises the first phase inverter U3F; Its input end receives the square-wave signal of 39kHz; Its output terminal links to each other the other end ground connection of resistance R 37, the source ground of FET Q10 with the input end of the second phase inverter U3A, an end of resistance R 37, the grid of FET Q10, the grid of FET Q11 respectively; The output terminal of the second phase inverter U3A links to each other with an end of resistance R 38, the grid of FET Q9, the grid of FET Q12 respectively; The other end ground connection of resistance R 38, the source ground of FET Q12 links to each other with the output node TP1 of power circuit (4) after the drain electrode of FET Q9 links to each other with the drain electrode of FET Q11; The source electrode of FET Q9 links to each other with the drain electrode of FET Q10, an end of resistance R 35 respectively; The source electrode of FET Q11 links to each other with the drain electrode of FET Q12, an end of resistance R 36 respectively, and resistance R 35, R36 connect the two ends of the secondary coil of isolating transformer T3 respectively, and the primary coil of isolating transformer T3 links to each other with neutral electrode to be monitored.
3. neutral electrode contact quality observation circuit according to claim 1; It is characterized in that: described control circuit (2) comprises control chip U8; Control chip U8 adopts the LM3914 chip; Its 5th pin passes through resistance R 30 ground connection, and links to each other with the output node COM of power circuit (4) through resistance R 29, and the 6th, 7 pins of LM3914 chip link to each other with an end of resistance R 15 after linking to each other; The 2nd, 4,8 pins of LM3914 chip link to each other with the other end of resistance R 15 after linking to each other; The 2nd pin ground connection of LM3914 chip, the 3rd, 9 pins of LM3914 chip all meet power supply VCC, and the 1st, 10,11,12,13,14,15,16,17,18 pins of LM3914 chip link to each other with the input end of display circuit (3); The 12nd pin of LM3914 chip links to each other with the input end of phase inverter U3D, and the output terminal of phase inverter U3D links to each other with warning circuit; Described display circuit (3) comprises LED 1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10; The equal ground connection of its negative electrode; Its anode links to each other with the output terminal of control circuit (2), an end of current-limiting resistance (5) respectively, and the other end of current-limiting resistance (5) all meets power supply VCC.
4. neutral electrode contact quality observation circuit according to claim 3 is characterized in that: the anode of described LED 1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, LED9, LED10 links to each other with the 1st, 18,17,16,15,14,13,12,11,10 pins of LM3914 chip respectively.
5. neutral electrode contact quality observation circuit according to claim 1; It is characterized in that: described power circuit (4) comprises voltage follower U5A; Its power supply termination+9V direct current; Its positive input links to each other with adjustable resistance R29, links to each other with an end of resistance R 32 after its inverting input links to each other with its output terminal, and the other end of resistance R 32 links to each other with the inverting input of amplifier U5B; The output terminal of amplifier U5B links to each other with the anode of diode D1, and the negative electrode of diode D1 links to each other with the input end of control circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200649935U CN202443069U (en) | 2012-02-27 | 2012-02-27 | Monitoring circuit for contact quality of neutral electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200649935U CN202443069U (en) | 2012-02-27 | 2012-02-27 | Monitoring circuit for contact quality of neutral electrode |
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| Publication Number | Publication Date |
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| CN202443069U true CN202443069U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200649935U Expired - Fee Related CN202443069U (en) | 2012-02-27 | 2012-02-27 | Monitoring circuit for contact quality of neutral electrode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708547A (en) * | 2015-06-12 | 2018-02-16 | 皇家飞利浦有限公司 | Surface myoelectric drawing system, logger and method |
| CN108333464A (en) * | 2018-04-21 | 2018-07-27 | 国网湖北省电力有限公司荆门供电公司 | The quick verifying unit of cable core |
| CN112914745A (en) * | 2021-04-06 | 2021-06-08 | 湖南菁益医疗科技有限公司 | Self-adaptive dynamic neutral electrode contact quality detection method |
-
2012
- 2012-02-27 CN CN2012200649935U patent/CN202443069U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708547A (en) * | 2015-06-12 | 2018-02-16 | 皇家飞利浦有限公司 | Surface myoelectric drawing system, logger and method |
| CN107708547B (en) * | 2015-06-12 | 2021-11-23 | 皇家飞利浦有限公司 | Surface electromyography system, recorder and method |
| CN108333464A (en) * | 2018-04-21 | 2018-07-27 | 国网湖北省电力有限公司荆门供电公司 | The quick verifying unit of cable core |
| CN112914745A (en) * | 2021-04-06 | 2021-06-08 | 湖南菁益医疗科技有限公司 | Self-adaptive dynamic neutral electrode contact quality detection method |
| CN112914745B (en) * | 2021-04-06 | 2022-06-10 | 湖南菁益医疗科技有限公司 | Self-adaptive dynamic neutral electrode contact quality detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20150227 |
|
| EXPY | Termination of patent right or utility model |