CN1719263B - Passive strong isolation micro voltage detection switch - Google Patents
Passive strong isolation micro voltage detection switch Download PDFInfo
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- CN1719263B CN1719263B CN 200510031586 CN200510031586A CN1719263B CN 1719263 B CN1719263 B CN 1719263B CN 200510031586 CN200510031586 CN 200510031586 CN 200510031586 A CN200510031586 A CN 200510031586A CN 1719263 B CN1719263 B CN 1719263B
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Abstract
The present invention relates to a passive strongly-isolated microvoltage detection switch. It includes isolation circuit, shaping circuit and switch drive circuit. Two input ends of said isolation circuit are respectively connected with signal detection end, the output end of signal isolated and coupled by said isolation circuit can be respectively connected with two AC signal input ends of shaping circuit capable of converting AC signal into DC signal, and two DC signal output ends of said shaping circuit are respectively connected with two input ends of the described switch drive circuit.
Description
Technical field:
The invention belongs to a kind of device that detects direct current or exchange the small voltage signal, particularly a kind of passive strong isolation micro voltage detection switch.
Technical background:
Present various voltage check devices mostly need independently power supply, and I/O isolation voltage grade is not high, some special application scenario yet (as the measurement of locomotive brake resistance temperature), need use a kind of should be passive, the device that higher I/O isolation Level is arranged again, can be used for detecting the fluctuation situation of certain small voltage signal, when this micro voltage signal was higher or lower than a certain setting value, this device can come to slave device with indication with the connection or the shutoff of certain contact.Especially, might up and down during frequent fluctuation, also require this device to have and be similar to " hysteresis " characteristic that this schmitt trigger has in certain value when detected micro voltage signal.The micro voltage pick-up unit that can satisfy above various requirement still is a blank at present at home.
Summary of the invention:
The present invention be directed to above-mentioned particular application blank special develop, also can be used for the occasion that other have similar requirement.When the voltage signal of its input end was higher or lower than a certain setting value, its output terminal can produce the action of corresponding conducting or shutoff.
It comprises buffer circuit 1, shaping circuit 2 and switch driving circuit 3, wherein:
Two input ends of described buffer circuit 1 link to each other with the input end respectively, output terminal through the signal of this buffer circuit 1 isolation coupling links to each other with two AC signal input ends of the shaping circuit 2 that AC signal is changed into direct current signal respectively, two direct current signal output terminals of this shaping circuit 2 link to each other with two input ends of described switch driving circuit 3 respectively, this switch driving circuit 3 is when input end has DC current to pass through, and its output is in the low resistive state of conducting;
Described switch driving circuit 3 comprises first optical coupled switch (9), described switch driving circuit 3 also comprises the return difference circuit that is made of second optical coupled switch 10 and second current-limiting resistor 11, first current-limiting resistor 7 of wherein said shaping circuit 2 links to each other with a control input end of first optical coupled switch 9, another control input end of first optical coupled switch 9 links to each other with second current-limiting resistor 11, and the other end of second current-limiting resistor 11 links to each other with the output terminal of described shaping circuit 2; The emitter of the illuminated triode of first optical coupled switch 9 is connected with the anode of the light emitting diode of second optical coupled switch 10.
Also comprise an AC and DC selection circuit that constitutes by direct current, AC transform circuit 4 and selector switch 5, the moved end of described selector switch 5 links to each other with an input input end, an one fixed end links to each other with the input end of direct current, AC transform circuit 4, another fixed end links to each other with the output terminal of described direct current, AC transform circuit 4, and the output terminal of this direct current, AC transform circuit 4 also links to each other with an input end of described buffer circuit 1, and another input end of described buffer circuit 1 links to each other with another input input end.
Described buffer circuit 1 comprises a pulse transformer;
Described shaping circuit 2 comprises the current rectifying and wave filtering circuit that is made of commutation diode 6, first current-limiting resistor 7 and filter capacitor 8, wherein be connected on an output terminal of described buffer circuit 1 and an output terminal of described shaping circuit 2 by commutation diode 6, first current-limiting resistor 7, filter capacitor 8 is connected in parallel between another output terminal of the intermediate point of commutation diode 6, first current-limiting resistor, 7 series arms and buffer circuit 1, and another output terminal of described shaping circuit 2 links to each other with another output terminal of described buffer circuit 1;
Described switch driving circuit 3 comprises first optical coupled switch 9.
The present invention is made of buffer circuit, shaping circuit and switch driving circuit, whether the voltage signal that does not need to detect its input end from outside input power supply is higher or lower than a certain setting value, and can produce the action of corresponding conducting or shutoff at its output terminal.
Description of drawings
Fig. 1 is a circuit theory synoptic diagram of the present invention;
Fig. 2 is the circuit theory synoptic diagram of one embodiment of the present of invention;
Fig. 3 is the circuit theory synoptic diagram of second embodiment of the present invention;
Fig. 4 is the circuit theory synoptic diagram of the 3rd embodiment of the present invention;
Fig. 5 is the circuit theory of the 3rd embodiment of the present invention.
Embodiment
As shown in the figure, comprise buffer circuit 1, shaping circuit 2 and switch driving circuit 3, wherein:
Two input ends of described buffer circuit 1 link to each other with the input end respectively, signal output part through this buffer circuit 1 isolation coupling links to each other with two AC signal input ends of the shaping circuit 2 that AC signal is changed into direct current signal respectively, two direct current signal output terminals of this shaping circuit 2 link to each other with two input ends of described switch driving circuit 3 respectively, this switch driving circuit 3 is when input end has DC current to pass through, and its output is in the low resistive state of conducting;
Also comprise an AC and DC selection circuit that constitutes by direct current, AC transform circuit 4 and selector switch 5, the moved end of described selector switch 5 links to each other with an input input end, an one fixed end links to each other with the input end of direct current, AC transform circuit 4, another fixed end links to each other with the output terminal of described direct current, AC transform circuit 4, and the output terminal of this direct current, AC transform circuit 4 also links to each other with an input end of described buffer circuit 1, and another input end of described buffer circuit 1 links to each other with another input input end.
Described buffer circuit 1 comprises a pulse transformer;
Described shaping circuit 2 comprises the current rectifying and wave filtering circuit that is made of commutation diode 6, first current-limiting resistor 7 and filter capacitor 8, wherein be connected on an output terminal of described buffer circuit 1 and an output terminal of described shaping circuit 2 by commutation diode 6, first current-limiting resistor 7, filter capacitor 8 is connected in parallel between another output terminal of the intermediate point of commutation diode 6, first current-limiting resistor, 7 series arms and buffer circuit 1, and another output terminal of described shaping circuit 2 links to each other with another output terminal of described buffer circuit 1;
Described switch driving circuit 3 comprises first optical coupled switch 9.
Described switch driving circuit 3 also comprises the return difference circuit that is made of second optical coupled switch 10 and second current-limiting resistor 11, first current-limiting resistor 7 of wherein said shaping circuit 2 links to each other with a control input end of first optical coupled switch 9, another control input end of first optical coupled switch 9 links to each other with second current-limiting resistor 11, and the other end of second current-limiting resistor 11 links to each other with the output terminal of described shaping circuit 2; The emitter of the illuminated triode of first optical coupled switch 9 is connected with the anode of the light emitting diode of second optical coupled switch 10.
Content of the present invention comprises isolates amplification, signal shaping, three parts of switch drive.Isolating the amplifier section main element is a step-up pulse transformer, and it not only is responsible for input signal is amplified, and also bears the I/O isolation that the first order exchanges 4000V.If detected voltage is AC signal, can directly be added on this pulse transformer; If detected voltage is direct current signal, then also to add mainly in this pulse transformer front by a PWM boost booster circuit that chip forms be used for will input direct current signal change the AC signal that is added on the former limit of pulse transformer into, this moment, pulse transformer was except that being responsible for boosting and isolating, and the boost energy storage inductor that boosts of chip of PWM is also served as on its former limit.The AC signal that the signal shaping part produces the pulse transformer secondary by simple diode half-wave rectification and filter capacitor becomes direct current signal and uses for next stage.Thereby switch drive is partly used the DC voltage after higher level's rectification to drive an optical coupled switch through current-limiting resistance and is produced the indicator signal of conducting or shutoff at output terminal, and optical coupled switch is also born the I/O isolation that the second level exchanges 2000V simultaneously.Especially, for being had, this device is similar to " hysteresis " characteristic that this schmitt trigger has, also used second optical coupled switch, by with the output of first optical coupled switch as the input of second optical coupled switch simultaneously with the output of second optical coupled switch method as the input of first optical coupled switch, and, thereby can control the size of return difference between the upper and lower bound of detected magnitude of voltage by the value of regulating this resistance at the output terminal of second optical coupled switch current-limiting resistance in parallel.At last, the output terminal at this device has also added some overvoltage protections and output filter circuit.
This device can detected minimum direct current voltage be 0.45V.
Claims (2)
1. passive strong isolation micro voltage detection switch, it comprises buffer circuit (1), shaping circuit (2) and switch driving circuit (3), described shaping circuit (2) comprises first current-limiting resistor (7), it is characterized in that:
Two input ends of described buffer circuit (1) link to each other with the input end respectively, signal output part through this buffer circuit (1) isolation coupling links to each other with two AC signal input ends of the shaping circuit (2) that AC signal is changed into direct current signal respectively, and two direct current signal output terminals of this shaping circuit (2) link to each other with two input ends of described switch driving circuit (3) respectively;
Described switch driving circuit (3) comprises first optical coupled switch (9), described switch driving circuit (3) also comprises the return difference circuit that is made of second optical coupled switch (10) and second current-limiting resistor (11), first current-limiting resistor (7) of wherein said shaping circuit (2) links to each other with a control input end of first optical coupled switch (9), another control input end of first optical coupled switch (9) links to each other with second current-limiting resistor (11), and the other end of second current-limiting resistor (11) links to each other with the output terminal of described shaping circuit (2); The emitter of the illuminated triode of first optical coupled switch (9) is connected with the anode of the light emitting diode of second optical coupled switch (10).
2. a kind of passive strong isolation micro voltage detection switch as claimed in claim 1, it is characterized in that: also comprise one by direct current, the friendship that AC transform circuit (4) and selector switch (5) constitute, direct current is selected circuit, the moved end of described selector switch (5) links to each other with an input input end, an one fixed end and direct current, the input end of AC transform circuit (4) links to each other, another fixed end and described direct current, the output terminal of AC transform circuit (4) links to each other, and this direct current, the output terminal of AC transform circuit (4) also links to each other with an input end of described buffer circuit (1), and another input end of described buffer circuit (1) links to each other with another input input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031586 CN1719263B (en) | 2005-05-24 | 2005-05-24 | Passive strong isolation micro voltage detection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510031586 CN1719263B (en) | 2005-05-24 | 2005-05-24 | Passive strong isolation micro voltage detection switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1719263A CN1719263A (en) | 2006-01-11 |
| CN1719263B true CN1719263B (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510031586 Expired - Fee Related CN1719263B (en) | 2005-05-24 | 2005-05-24 | Passive strong isolation micro voltage detection switch |
Country Status (1)
| Country | Link |
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| CN (1) | CN1719263B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383405B (en) * | 2013-07-10 | 2016-04-27 | 珠海许继芝电网自动化有限公司 | A kind of passive signal voltage detection method |
| CN108197058A (en) * | 2018-01-03 | 2018-06-22 | 武汉精测电子集团股份有限公司 | A kind of QSPI isolation drive devices based on FPGA |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2052905U (en) * | 1989-03-31 | 1990-02-14 | 福州变压器厂 | Trouble alarm for on-load automatic voltage-regulating transformer |
| CN2293055Y (en) * | 1996-11-01 | 1998-09-30 | 中国科学院安徽光学精密机械研究所 | Opto-electronic coupled AC multi-liquid level measuring device |
| CN2480851Y (en) * | 2001-05-29 | 2002-03-06 | 温继廷 | Speech sound automatic warning device for high voltage test |
-
2005
- 2005-05-24 CN CN 200510031586 patent/CN1719263B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2052905U (en) * | 1989-03-31 | 1990-02-14 | 福州变压器厂 | Trouble alarm for on-load automatic voltage-regulating transformer |
| CN2293055Y (en) * | 1996-11-01 | 1998-09-30 | 中国科学院安徽光学精密机械研究所 | Opto-electronic coupled AC multi-liquid level measuring device |
| CN2480851Y (en) * | 2001-05-29 | 2002-03-06 | 温继廷 | Speech sound automatic warning device for high voltage test |
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| CN1719263A (en) | 2006-01-11 |
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