CN103337839B - A kind of MOS door PLC optocoupler drive circuit and resistance loop device - Google Patents
A kind of MOS door PLC optocoupler drive circuit and resistance loop device Download PDFInfo
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- CN103337839B CN103337839B CN201310260257.6A CN201310260257A CN103337839B CN 103337839 B CN103337839 B CN 103337839B CN 201310260257 A CN201310260257 A CN 201310260257A CN 103337839 B CN103337839 B CN 103337839B
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Abstract
The present invention relates to a kind of MOS door PLC optocoupler drive circuit and resistance loop device, this PLC optocoupler drive circuit comprises the PLC optocoupler terminal that is configured with MOS gate circuit, resistance loop is parallel with at the successive load two ends of described PLC optocoupler terminal, described resistance loop is made up of a disconnecting link and a resistant series, resistance loop device of the present invention is made up of described resistance loop, one end of described resistance is welded on one end of disconnecting link, resistance is connected two conducting end of described resistance loop device with the other end correspondence of disconnecting link, described resistance loop device by described conducting end for being arranged on the successive load two ends of MOS door PLC optocoupler terminal.By the setting of resistance loop, avoid the conducting phenomenon in short-term of PLC optocoupler, decrease the discharge time of MOS gate circuit, eliminate the impact of self parasitic circuit of MOS door and its shunt capacitance.
Description
Technical field
The present invention relates to high voltage direct current transmission Control protection field, be specifically related to a kind of MOS door PLC optocoupler drive circuit and resistance loop device.
Background technology
Due to the feature such as MOS door loop signal transmission speed is fast, in voltage direct-current transmission control protection system Interface design, widely apply the PLC optocoupler terminal that this type of MOS door designs.Owing to can cause the continuous change of electric current in MOS door interrupting process, these electric currents constantly changed flow through in wire and printed board, can produce the change of voltage.In the Electronic Design loop of MOS gating element, in order to ensure that the voltage of MOS element is not with this electric current generation acute variation, shunt capacitance can be increased on MOS door and carrying out filtering high-frequency interferencing signal.
Due to the impact of the parasitic circuit of MOS door own and shunt capacitance, in MOS door turn off process, there is longer discharge time; And under the former limit excitation disconnection of PLC optocoupler terminal, the MOS gate circuit that closes instantaneously has the phenomenon of conducting in short-term, easily causes the false triggering of successive load.
Summary of the invention
The object of this invention is to provide a kind of MOS door PLC optocoupler drive circuit and resistance loop device, the problem that the PLC optocoupler in order to eliminate existing employing MOS circuit affects by shunt capacitance.
For achieving the above object, the solution of the present invention is: a kind of MOS door PLC optocoupler drive circuit, this PLC optocoupler drive circuit comprises the PLC optocoupler terminal that is configured with MOS gate circuit, be parallel with resistance loop at the successive load two ends of described PLC optocoupler terminal, described resistance loop is made up of a switch and a resistant series.
Described switch is a disconnecting link.
The present invention also provides a kind of resistance loop device, described resistance loop device is made up of a resistance loop, described resistance loop is made up of a switch and a resistant series, one end of described resistance is welded on one end of switch, the other end correspondence of resistance and switch is connected two conducting end of described resistance loop device, described resistance loop device by described conducting end for being arranged in the successive load loop of MOS door PLC optocoupler terminal.
Described resistance loop device buckle is arranged in the successive load loop of MOS door PLC optocoupler terminal.
Described switch is disconnecting link
The beneficial effect that the present invention reaches: the present invention is provided with resistance loop in the successive load loop of MOS door PLC optocoupler terminal, when the former limit excitation of PLC optocoupler terminal disappears, first by connecting this resistance loop, the temporary impact voltage that MOS gate circuit in PLC optocoupler produces is discharged by resistance loop, like this, the switch in successive load of closing again loop, under just avoiding the disconnection of PLC optocoupler terminal former limit excitation, surge voltage because of successive load circuit switching generation of closing instantaneously causes the conducting phenomenon in short-term of PLC optocoupler, and owing to increasing resistance loop, electric current in loop is increased, decrease the discharge time of shunt capacitance, eliminate the impact of self parasitic circuit of MOS door and its shunt capacitance.
Resistance is directly welded in disconnecting link terminal, and resistance loop adopts buckle-type mounting means, has heat radiation aperture, be convenient to installation and the heat radiation of resistance, and maintenance cost is low, be easy to realize in-site installation and improvement in PLC optocoupler terminal.
Accompanying drawing explanation
Fig. 1 is MOS door PLC optocoupler driving circuit principle figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
MOS door PLC optocoupler drive circuit embodiment:
MOS door PLC optocoupler loop of the present invention comprises the PLC optocoupler terminal that is configured with MOS gate circuit, is parallel with resistance loop at the successive load two ends of described PLC optocoupler terminal, and described resistance loop is made up of a switch and a resistant series.
As shown in Figure 1, K2 is the former limit control switch of PLC optocoupler, K1 is successive load circuit controls switch, resistance loop is composed in series by resistance R and K switch 3, and in the present embodiment, successive load is a PLC optocoupler, K switch 3 is a disconnecting link, this resistance loop is connected in parallel on rear class PLC optocoupler two ends, and resistance loop has the effect eliminated MOS gate circuit conducting phenomenon in short-term and accelerate MOS gate circuit discharge time, and specific implementation process is as follows:
1. eliminate MOS gate circuit conducting phenomenon in short-term
As Fig. 1, before access resistance loop, when K2 disconnects, namely when the former limit excitation of prime PLC optocoupler disconnects, if moment Closing Switch K1, can produce and teach surge voltage, larger surge voltage can make the MOS gate circuit of prime optocoupler produce a conducting in short-term, causes the false triggering of rear class PLC optocoupler.
After access resistance loop, closing at K2, when K1 disconnects, is namely the test mode of MOS gate circuit in previous stage PLC optocoupler, when test terminates, first close resistance loop disconnecting link K3, resistance is linked in load circuit, and then disconnects K2, due to resistance loop for MOS gate circuit provides current circuit, the temporary impact voltage of the parasitic circuit of MOS gate circuit own and shunt capacitance discharges through resistance loop, and finally close K1 switch again, thus eliminating the need the conducting phenomenon in short-term of MOS gate circuit.
2. accelerate MOS gate circuit discharge time
As Fig. 1, before access resistance loop, when K1 is closed, open K2 if directly instantaneous, due to the impact of self parasitic circuit of MOS door and shunt capacitance thereof, in MOS door turn off process, discharge time is long, easily causes the misoperation in subordinate loop.
After access resistance loop, when K2, K1 close simultaneously, namely be interface loop normal operating condition, now, close resistance loop disconnecting link K3, resistance is linked in load circuit, and then instantaneous disconnection K2 switch, increase resistance loop and be just equivalent to add load circuit on the basis in original loop, because the resistance in resistance loop will much smaller than the resistance of successive load, so just make the electric current in original loop greatly increase, accelerate the discharge time of MOS gate circuit.Because the time of MOS door loop bypass capacitive effect is shorter, for reducing the loss that resistance brings, after increase resistance loop accelerates discharge process, directly open disconnecting link K3, bypass resistance loop.
Resistance loop device embodiment of the present invention:
Resistance loop device of the present invention is made up of a resistance loop, described resistance loop is made up of a switch and a resistant series, one end of described resistance is welded on one end of switch, the other end correspondence of resistance and switch is connected two conducting end of described resistance loop device, described resistance loop device by described conducting end for being arranged in the successive load loop of MOS door PLC optocoupler terminal.
The switch of the present embodiment is disconnecting link, and resistance is directly welded in disconnecting link terminal, has heat radiation aperture in disconnecting link terminal, is convenient to installation and the heat radiation of resistance; Resistive seal installs in terminal, adopts the buckle-type mounting means of terminal, is convenient to the quick installation of resistance loop.
The effect of resistance loop device of the present invention is identical with MOS door PLC optocoupler circuit embodiments with specific implementation process, does not repeat them here.
Claims (2)
1. a MOS door PLC optocoupler drive circuit, this PLC optocoupler drive circuit comprises the PLC optocoupler terminal that is configured with MOS gate circuit, it is characterized in that, be parallel with resistance loop at the successive load two ends of described PLC optocoupler terminal, described resistance loop is made up of a switch and a resistant series; By the setting of resistance loop, avoid the conducting phenomenon in short-term of PLC optocoupler, decrease the discharge time of MOS gate circuit, eliminate the impact of self parasitic circuit of MOS door and its shunt capacitance.
2. MOS door PLC optocoupler drive circuit according to claim 1, it is characterized in that, described switch is a disconnecting link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260257.6A CN103337839B (en) | 2013-06-26 | 2013-06-26 | A kind of MOS door PLC optocoupler drive circuit and resistance loop device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260257.6A CN103337839B (en) | 2013-06-26 | 2013-06-26 | A kind of MOS door PLC optocoupler drive circuit and resistance loop device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103337839A CN103337839A (en) | 2013-10-02 |
| CN103337839B true CN103337839B (en) | 2015-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310260257.6A Expired - Fee Related CN103337839B (en) | 2013-06-26 | 2013-06-26 | A kind of MOS door PLC optocoupler drive circuit and resistance loop device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864456A (en) * | 1997-12-23 | 1999-01-26 | Square D Company | Clock line over-current protector and industrial control system employing same |
| CN101267156A (en) * | 2008-04-29 | 2008-09-17 | 哈尔滨工业大学深圳研究生院 | Separation driving circuit and control method with discharging channel |
| CN102095921A (en) * | 2009-12-11 | 2011-06-15 | 鸿富锦精密工业（深圳）有限公司 | Surging current test circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035182A (en) * | 2010-11-26 | 2011-04-27 | 中国科学院上海技术物理研究所 | Universal type short circuit isolation protection circuit for flyback switching power supply |
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2013
- 2013-06-26 CN CN201310260257.6A patent/CN103337839B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5864456A (en) * | 1997-12-23 | 1999-01-26 | Square D Company | Clock line over-current protector and industrial control system employing same |
| CN101267156A (en) * | 2008-04-29 | 2008-09-17 | 哈尔滨工业大学深圳研究生院 | Separation driving circuit and control method with discharging channel |
| CN102095921A (en) * | 2009-12-11 | 2011-06-15 | 鸿富锦精密工业（深圳）有限公司 | Surging current test circuit |
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| CN103337839A (en) | 2013-10-02 |
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