CN103529341A - Remote control loop detection circuit for negative control terminal - Google Patents
Remote control loop detection circuit for negative control terminal Download PDFInfo
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- CN103529341A CN103529341A CN201310533336.XA CN201310533336A CN103529341A CN 103529341 A CN103529341 A CN 103529341A CN 201310533336 A CN201310533336 A CN 201310533336A CN 103529341 A CN103529341 A CN 103529341A
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Abstract
The invention discloses a remote control loop detection circuit for a negative control terminal. The remote control loop detection circuit comprises a remote control output relay, a CPU, a protection circuit, a rectifying circuit, a first-level optical coupling detection circuit and a detection signal output circuit, wherein the normally open contact end of the remote control output relay is connected with the protection circuit; the protection circuit is connected with the rectifying circuit; the rectifying circuit is connected with the first-level optical coupling detection circuit; the first-level optical coupling detection circuit is connected with the detection signal output circuit; and the detection signal output circuit is connected with the I/O port of the CPU. The remote control loop detection circuit is connected between the normally open contact end and the common contact end of the remote control output relay. The remote control loop detection circuit needs no external equipment feedback signals, can know if the state of the loop is normal beforehand before the execution of remote control, and can guarantee the normal execution of tripping operation of the terminal. The remote control loop detection circuit has the advantages of simple circuit, small occupied space, easiness and reliability in realization and low cost.
Description
Technical field
The present invention relates to a kind of remote control circuit testing circuit, particularly a kind of remote control circuit testing circuit for negative control terminal.
Background technology
At present, the remote signals that terminal is fed back by outside actuating equipment is learnt the executing state of remote control output.The shortcoming of this mode is to learn in advance the state of remote control circuit, can not judge in advance the correctness in loop, only after remote control is carried out, just can learn concrete condition.
Summary of the invention
The object of this invention is to provide a kind ofly provides remote control circuit state and does not need external unit that the remote control circuit testing circuit for negative control terminal of feedback signal is provided for terminal.
This remote control circuit testing circuit for negative control terminal provided by the invention; comprise remote control output relay, CPU, holding circuit, rectification circuit, optocoupler testing circuit and detection signal output circuit; remote control output relay is connected with holding circuit; holding circuit is connected with rectification circuit; rectification circuit is connected with optocoupler testing circuit; optocoupler testing circuit is connected with detection signal output circuit, and detection signal output circuit is connected with the I/O port of CPU.
An input end of described rectification circuit is connected with the normally opened contact end of described remote control output relay by holding circuit, and another input end of this rectification circuit is connected with the common end of described remote control output relay.Described optocoupler testing circuit adopts and comprises the one-level optocoupler testing circuit of an optocoupler or the secondary optocoupler testing circuit that employing comprises two optocouplers.Described holding circuit comprises thermistor and some divider resistances.Described rectification circuit adopts full-wave rectification bridge-type circuit.Described one-level optocoupler testing circuit comprises one-level optocoupler, an output resistance and a Detection capacitance.Described secondary optocoupler testing circuit comprises one-level optocoupler, secondary optocoupler, an output resistance, a triode and a Detection capacitance.Described one-level optocoupler adopt diode drive current be not more than 0.5mA, current transfer ratio be not less than 300% and withstand voltage meet the optocoupler of 4kV.Described output resistance adopts resistance to be not less than the resistance of 100k Ω.Described Detection capacitance adopts the polarity free capacitor that is not more than 1 μ F.
The present invention is connected between the normally opened contact end and common end of remote control output relay.The present invention does not need external unit feedback signal, and normally whether the state that just can know in advance loop before remote control is carried out, and guarantees that terminal tripping operation moves and can normally carry out.Owing to having adopted rectifier circuit, in the time of outside access DC equipment, the present invention can ignore the positive reversed polarity of access, normally detects.Circuit of the present invention is simple, takes up room little; Realize simple and reliable, with low cost.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is a kind of embodiment circuit diagram of the present invention.
Fig. 3 is the cut-away view of one-level optocoupler of the present invention.
Embodiment
One end of the present invention is connected with the normally opened contact end of remote control output relay, and the other end is connected with the common end of this relay.
The present invention includes remote control output relay, CPU, holding circuit, rectification circuit, optocoupler testing circuit and detection signal output circuit.
Existing equipment is connected with the normally opened contact of remote control output relay: the normally opened contact end of remote control output relay is connected with an input end of rectification circuit by holding circuit, and the common end of this relay is connected with another input end of rectification circuit; The output terminal of rectification circuit is connected with the input end of optocoupler testing circuit, and the output terminal of optocoupler testing circuit is connected with the input end of detection signal output circuit, and the output terminal of detection signal output circuit is connected with the I/O port of CPU.
Optocoupler testing circuit of the present invention can adopt the optocoupler testing circuit that only comprises 1 optocoupler, also can adopt the optocoupler testing circuit that comprises 2 optocouplers.
As shown in Figure 1, the present invention includes remote control output relay, CPU, holding circuit, rectification circuit, one-level optocoupler testing circuit, secondary optocoupler testing circuit and detection signal output circuit.
The normally opened contact end of remote control output relay is connected with an input end of rectification circuit by holding circuit, and the common end of this relay is connected with another input end of rectification circuit; The output terminal of rectification circuit is connected with one-level optocoupler testing circuit, one-level optocoupler testing circuit is connected with secondary optocoupler testing circuit, secondary optocoupler testing circuit is connected with the input end of detection signal output circuit, and the output terminal of detection signal output circuit is connected with the I/O port of CPU.
Holding circuit has overcurrent protection, prevents the whole remote control circuit of rear end fault effects.
The effect of rectification circuit is mainly when being direct current for remote control equipment power supply, and after overcommutation, it is negative that no matter the wiring of external remote control equipment connect just connects, and remote control circuit can be correct detects loop state.
Take normally opened contact as example: supposes that conventional remote control equipment power supply has two kinds at present, exchange 220/380V or direct current 24V-100V.If remote control circuit is normal, between the normally opened contact of relay, just there is so voltage, voltage range is at AC220/380V ± 20% or DC24V-100V.
Voltage is through there being the holding circuit of overcurrent protection; then after a series of voltage dividing potential drop; via rectification circuit, enter first order optocoupler again; drive the light emitting diode conducting of this optocoupler; then the light emitting diode conducting of the signal driver second level optocoupler of this one-level optocoupler, finally the output signal of this secondary optocoupler is input to the I/O port of CPU.Now, CPU judges according to initial state current remote control circuit is in which kind of state.When external remote control equipment is connected with alternating current equipment, the signal that inputs to the IO port of CPU is square-wave signal; When external remote control equipment is connected with DC equipment, the signal that inputs to the IO port of CPU is the level signal of a normality.
Take that outside alternating current equipment is connected with the normally opened contact of remote control circuit below, to adopt the situation of the optocoupler testing circuit that comprises 2 optocouplers be example to optocoupler testing circuit, the present invention is further illustrated.
As shown in Figure 2, the dotted line left side is the equipment that external remote control loop connects, and at this, with the relay exchanging, replaces.The present invention includes relay, external ac power source AC, remote control output relay, thermistor PTC3, divider resistance circuit, rectifier bridge REC1, optocoupler D9, output resistance R60, optocoupler D10 and triode V17.
Remote control output relay comprises the common end COM of normally opened contact end NO, remote control output relay.
Divider resistance circuit comprises resistance R 62, resistance R 55, resistance R 56, resistance R 59, resistance R 57, resistance R 58 and resistance R 61.
One end of external ac power source AC is connected with the normally opened contact end NO of remote control output relay, and the other end of this power supply is connected with the common end COM of remote control output relay by relay.Above-mentioned normally opened contact end NO is connected with 1 end of rectifier bridge REC1 by thermistor PTC3 series connection divider resistance circuit, 2 ends of this rectifier bridge are connected with the common end COM of remote control output relay, its 3 end is connected with 2 pin of optocoupler D9, its 4 end is connected with 3 pin of this optocoupler D9, is also connected to a polarity free capacitor C23 between 3 ends of this rectifier bridge and 4 ends.8 pin of optocoupler D9 are connected with the anode tap of optocoupler D10 by resistance R 64; 6 pin of optocoupler D9 are all connected with power supply V12P0_ISO with 8 pin; 5 pin of this optocoupler D9 are by output resistance R60 ground connection, and this 5 pin is also connected with the base stage of triode V17 by resistance R 54.The collector of triode V17 is connected with the cathode terminal of optocoupler D10, its grounded emitter.The collector terminal of optocoupler D10 is connected with power supply V3P3 by resistance R 63, and this collector is also connected with the I/O pin of CPU, for transmitting detection signal detec; Between the collector terminal of this optocoupler D10 and emitter-base bandgap grading end, be also connected to a polarity free capacitor C24; The emitter-base bandgap grading end ground connection of this optocoupler D10.
As can be seen from the figure, the loop of external remote control equipment normal operation is normally opened contact end NO, the common end COM of remote control output relay, relay, the external ac power source AC of external ac power source AC, remote control output relay, that is to say that the remote control actuating equipment of outside power supply is received between the normally opened contact of remote control output relay.It is normally opened contact end NO, thermistor PTC3, resistance R 62, resistance R 55, resistance R 56, resistance R 59, resistance R 57, resistance R 58, resistance R 61, rectifier bridge REC1, the common end COM of remote control output relay, relay, the external ac power source AC of external ac power source AC, remote control output relay that remote control detects loop.
During original state, terminal powers on, what equipment the outside, contact of remote control output relay does not take over, above-mentioned remote control detects in loop and does not have power supply, and optocoupler D9 can not conducting, thereby the base stage of triode V17 does not have voltage, triode can not conducting, so optocoupler D10 can not conducting, detection signal detec is owing to drawing effect in resistance R 63, so the I/O pin of CPU reads in high level signal always.If outside incoming transport equipment now; so above-mentioned remote control detects loop and has voltage; voltage is protected and electric resistance partial pressure by temperature-sensitive; then by rectifier bridge REC1, make optocoupler D9 conducting; the upper voltage that produces of output resistance R60, impels triode V17 conducting, thus optocoupler D10 conducting; the optocoupler D10 that detection signal detec is switched on moves ground to, and the signal that the I/O pin of CPU reads in becomes low level signal.
Because outside access is 50Hz alternating current equipment, so detection signal detec is a square-wave signal, but dutycycle 1:1 not necessarily, this is that parameter by physical circuit determines.If what outside, connect is direct current signal, and when External Access Equipment and loop are normal time, detection signal detec is a normal low signal so.CPU can, by reading the state of detection signal detec, judge that whether current remote control circuit is normal; What if necessary, CPU also can access according to this current outside of signal judgement is DC equipment or alternating current equipment.
The present invention also has the second circuit implementing scheme, only adopts an optocoupler.Physical circuit connects: remove optocoupler 10 in Fig. 2, pull-up resistor R63 and power supply V3P3,2 pin of resistance R 64 are connected with 3 pin of triode V17,3 pin of this triode are connected with the I/O pin of CPU, for transmitting detection signal detec.Capacitor C 24 is connected between triode 3 pin and ground.
At this, adopted triode as shown in Figure 2 to drive the scheme of optocoupler.The needed drive current of triode and driving voltage are all very little, thus adopt the mode of triode to meet design requirement, also economic and practical.Therefore, adopt the embodiment that is driven second level optocoupler by triode, namely adopt the circuit embodiment of two-stage optocoupler for preferred.
The difficult point of the present invention's design is: 1. external unit voltage range is at AC220/380V ± 20% or DC24V-100V, and voltage span is very large; 2. the electric current of remote control circuit self will be limited in 2mA, prevents the excessive equipment malfunction work that causes of loop current.Therefore, the present invention needs the in the situation that of large voltage and small voltage, to work simultaneously, and guarantees to have enough electric currents to impel optocoupler conducting, could examinations.
In order to solve an above-mentioned difficult problem, the present invention has done following measure.
1. the type selecting of one-level optocoupler and circuit design.
The selection of one-level optocoupler (optocoupler D9 position as shown in Figure 2) at least will meet 3 requirements: its diode to drive galvanic current little, advise this drive current≤0.5mA; Its current transfer ratio (CTR) will be tried one's best greatly, advises this current transfer ratio >=300%; It is withstand voltage will meet the withstand voltage of 4KV.
For these three parameters of one-level optocoupler, also to select moderately, if certainly parameter is far superior to such requirement, implement than being easier to, but device cost be higher, so will consider simultaneously.
One-level optocoupler is except the selection of parameter, also particular importance in circuit design, the output of one-level optocoupler as shown in Figure 3 has a variety of connections, but in order to utilize the characteristic of current transfer ratio, output resistance need to be received on one-level optocoupler pin 5, and be pulled down to ground.
2. the selection of the output resistance of one-level optocoupler.
After the output resistance wiring position of one-level optocoupler is determined, its resistance is selected also particular importance.In the present invention, the resistance of this output resistance needs large as far as possible, could on this output resistance, form enough driving voltages and drive circuit below in little electric current.The present invention can adopt the resistance of output resistance to be more than or equal to the resistance of 100k Ω.
3. the selection of the Detection capacitance before one-level optocoupler.
When selecting the capacitance of Detection capacitance to be less than or equal to 1 μ F, it is alternating current equipment or DC equipment by CPU judgement External Access Equipment that the present invention can provide detection signal.
In addition, if do not need to judge that the equipment of outside access is alternating current equipment or DC equipment, the present invention can realize by raising the capacitance (capacitance that is Detection capacitance is greater than 1 μ F) of Detection capacitance, when exchanging input, also final output signal can be adjusted into level signal like this, but not square-wave signal; Be convenient to like this routine processes; Aspect anti-shake or inhibition interference, can provide better signal guarantee simultaneously.
Claims (10)
1. the remote control circuit testing circuit for negative control terminal; comprise remote control output relay, CPU; this testing circuit also comprises holding circuit, rectification circuit, optocoupler testing circuit and detection signal output circuit; remote control output relay is connected with holding circuit; holding circuit is connected with rectification circuit; rectification circuit is connected with optocoupler testing circuit, and optocoupler testing circuit is connected with detection signal output circuit, and detection signal output circuit is connected with the I/O port of CPU.
2. the remote control circuit testing circuit for negative control terminal according to claim 1; it is characterized in that; an input end of described rectification circuit is connected with the normally opened contact end of described remote control output relay by holding circuit, and another input end of this rectification circuit is connected with the common end of described remote control output relay.
3. the remote control circuit testing circuit for negative control terminal according to claim 1, is characterized in that, described optocoupler testing circuit adopts and comprises the one-level optocoupler testing circuit of an optocoupler or the secondary optocoupler testing circuit that employing comprises two optocouplers.
4. the remote control circuit testing circuit for negative control terminal according to claim 1, is characterized in that, described holding circuit comprises thermistor and some divider resistances.
5. the remote control circuit testing circuit for negative control terminal according to claim 1, is characterized in that, described rectification circuit adopts full-wave rectification bridge-type circuit.
6. the remote control circuit testing circuit for negative control terminal according to claim 1, is characterized in that, described one-level optocoupler testing circuit comprises one-level optocoupler, an output resistance and a Detection capacitance.
7. the remote control circuit testing circuit for negative control terminal according to claim 1, is characterized in that, described secondary optocoupler testing circuit comprises one-level optocoupler, secondary optocoupler, an output resistance, a triode and a Detection capacitance.
8. according to the remote control circuit testing circuit for negative control terminal described in claim 6 and 7, it is characterized in that, described one-level optocoupler adopt diode drive current be not more than 0.5mA, current transfer ratio be not less than 300% and withstand voltage meet the optocoupler of 4kV.
9. according to the remote control circuit testing circuit for negative control terminal described in claim 6 and 7, it is characterized in that, described output resistance adopts resistance to be not less than the resistance of 100k Ω.
10. according to the remote control circuit testing circuit for negative control terminal described in claim 6 and 7, it is characterized in that, described Detection capacitance adopts the polarity free capacitor that is not more than 1 μ F.
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| CN201310533336.XA CN103529341B (en) | 2013-11-04 | 2013-11-04 | Remote control circuit testing circuit for negative control terminal |
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| CN201310533336.XA CN103529341B (en) | 2013-11-04 | 2013-11-04 | Remote control circuit testing circuit for negative control terminal |
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| CN103529341B CN103529341B (en) | 2016-09-07 |
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| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
| CN113933693A (en) * | 2021-09-28 | 2022-01-14 | 科大智能电气技术有限公司 | Detection circuit suitable for multiple types of input and output and control method |
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| CN104917403A (en) * | 2015-05-25 | 2015-09-16 | 张家港市华为电子有限公司 | Automatic switching circuit in power supply applicable to 220V and 110V power grids |
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| CN103529341B (en) | 2016-09-07 |
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