CN105471419A - Binary input circuit - Google Patents
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- CN105471419A CN105471419A CN201410462569.XA CN201410462569A CN105471419A CN 105471419 A CN105471419 A CN 105471419A CN 201410462569 A CN201410462569 A CN 201410462569A CN 105471419 A CN105471419 A CN 105471419A
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Abstract
The invention relates to a binary input circuit. The binary input circuit comprises multiple binary input ends and a common end, and the binary input ends are connected to the common end via the same circuit node. The binary input circuit further comprises a threshold selection circuit, the threshold section circuit is connected between the circuit node and the common end, and comprises a voltage stabilizer and a switch device, and the voltage stabilizer is connected with the switching device in parallel. When the switching device is in the first state, the circuit node is connected with the common end via the voltage stabilizer; and when the switching device is in the second state, the circuit node is connected with the common end via the switching device. According to the binary input circuit in the invention, only the threshold selection circuit is arranged between the circuit node and the common end, so that wiring of the circuit is simpler and more flexible, the amount of devices in the circuit is greatly reduced, the circuit is easier to realize, and the circuit cost is reduced.
Description
Technical field
The present invention relates to a kind of two-value input circuit, particularly relate to a kind of two-value input circuit that can be applicable to multiple threshold voltage.
Background technology
Two-value input circuit (binaryinputcircuit) is a kind of conventional electronic circuit, is widely used in protection and supervising device, the remote-terminal unit, power monitoring devices etc. of such as protection relay, power distribution automation.Two-value input circuit in these devices is generally used for the state obtaining circuit breaker, switch etc., also can be used for obtaining position of the switch information, closing pressure signal, communication state, protection operation signal, terminal abnormal signal, switch energy storing state etc.
Fig. 1 shows a kind of typical two-value input circuit 10.As shown in Figure 1, this level signal for changing into the discernible level signal of processor 14 (high level or low level) by corresponding for the input voltage Vi being supplied to this two-value input circuit 10, and is flowed to processor 14 by two-value input circuit 10.Such as, when the input voltage Vi being supplied to two-value input circuit is 24 volts, two-value input circuit 10 can export high level to processor 14, and when the input voltage Vi being supplied to two-value input circuit is 0 volt, two-value input circuit can to processor 14 output low level.
As shown in Figure 1, two-value input circuit 10 generally includes protective circuit 11, Threshold selection circuit 12 and buffer circuit 13.Wherein, protective circuit 11 can not be subject to overcurrent or superpotential injury for the protection of two-value input circuit.Threshold selection circuit 12 for selecting the threshold value adapted with the voltage range of the input voltage Vi being supplied to this two-value input circuit, and for the size according to this threshold value and input voltage Vi corresponding output high level or low level.Buffer circuit 13 is for making input voltage Vi and processor 14 electrical isolation.
Two-value input circuit 10 usually can by electrical network or powered battery.Due to exist such as 110 volts and 220 volts (comprising 240 volts) two kinds conventional mains supply system, and also there are such as 24 volts and 28 volts two kinds in the voltage of battery, therefore be usually designed to can compatible two kinds of even two or more input voltage ranges for two-value input circuit, and this compatibility is normally by realizing the design of Threshold selection circuit.
In the protection such as remote-terminal unit, power monitoring devices and monitoring arrangement of protection relay, power distribution automation, usually need the state monitoring the signals such as multiple circuit breaker, switch, therefore, two-value input circuit often occurs with the form of multiple input.Fig. 2 shows a kind of two-value input circuit 20 with multiple input.As shown in Figure 2, two-value input circuit 20 has n input, each input for obtain a road signal to be monitored (V1, V2 ..., Vn) state.Identical with the two-value input circuit 10 shown in Fig. 1; in the branch road of each input of two-value input circuit 20; usually protective circuit 11, Threshold selection circuit 12 and buffer circuit 13 is included; overcurrent or superpotential injury can not be subject to protect the branch road of each input; the discernible level signal of processor 14 is changed into by corresponding for the input voltage of each input; and make input voltage and processor 14 electrical isolation of each input, and this makes the circuit realiration complexity of two-value input circuit 20 and cost all can correspondingly increase.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of two-value input circuit, it can realize Threshold selection for multiple inputs of two-value input circuit, and circuit realiration is simple, cost is low.
To achieve these goals, according to a kind of two-value input circuit of the present invention: it comprises multiple two-value input and a common port, described multiple two-value input is connected with described common port by same circuit node; Described two-value input circuit comprises a Threshold selection circuit, and this Threshold selection circuit is connected between described circuit node and described common port; Described Threshold selection circuit comprises a voltage-stabilizing device and a switching device, and described voltage-stabilizing device is in parallel with described switching device; When described switching device is in the first state, described circuit node is communicated with by described voltage-stabilizing device with described common port, and when described switching device is in the second state, described circuit node is communicated with by described switching device with described common port.
In two-value input circuit according to the present invention, owing to being only provided with a Threshold selection circuit between circuit node and common port, placement-and-routing's more simple and flexible of circuit, and the number of devices in circuit greatly reduces, thus circuit realiration is more simple, and circuit cost is minimized.
Accompanying drawing explanation
Below with reference to accompanying drawing, by coming according to a particular embodiment of the invention to be described in detail to object of the present invention, characteristic sum effect.These illustrate only for example, not in order to limit the scope of the invention.Wherein:
Fig. 1 shows a kind of typical two-value input circuit in prior art;
Fig. 2 shows a kind of two-value input circuit with multiple input in prior art;
Fig. 3 shows according to a kind of two-value input circuit of the present invention;
Fig. 4 shows the embodiment one of the Threshold selection circuit according to two-value input circuit of the present invention;
Fig. 5 shows the embodiment two of the Threshold selection circuit according to two-value input circuit of the present invention;
Fig. 6 shows the embodiment three of the Threshold selection circuit according to two-value input circuit of the present invention;
Fig. 7 shows the embodiment four of the Threshold selection circuit according to two-value input circuit of the present invention;
Fig. 8 shows a specific embodiment according to two-value input circuit of the present invention.
Embodiment
Fig. 3 shows according to a kind of two-value input circuit 30 of the present invention, and it comprises multiple two-value input BI_1, BI_2 ... BI_n and common port BI_COM, a n be greater than 1 natural number, two-value input BI_1, BI_2 ..., BI_n is connected with common port BI_COM by circuit node CN.Each two-value input such as can connect a circuit breaker (not shown), for obtaining the state of a road signal to be monitored.The signal that each two-value input obtains is converted into the discernible level signal of processor 14 through protective circuit 11, Threshold selection circuit 32 and buffer circuit 13 and exports; protective circuit 11 is identical with the function of buffer circuit 13 with the protective circuit 11 shown in Fig. 1 with Fig. 2 with buffer circuit 13, does not repeat them here.Distinguish with the prior art shown in Fig. 1 and Fig. 2, a Threshold selection circuit 32 is only comprised in two-value input circuit 30, this Threshold selection circuit is connected between circuit node CN and common port BI_COM, and arranges Threshold selection circuit no longer respectively in branch road between each two-value input to circuit node CN.Threshold selection circuit 32 comprises voltage-stabilizing device 321 and a switching device 322, and voltage-stabilizing device 321 is in parallel with switching device 322; When switching device 322 is in the first state, circuit node CN is communicated with by voltage-stabilizing device 321 with common port BI_COM, and when switching device 322 is in the second state, circuit node CN is communicated with by switching device 322 with common port BI_COM.
In two-value input circuit 30 according to the present invention, owing to being only provided with a Threshold selection circuit 32 between circuit node CN and common port BI_COM, placement-and-routing's more simple and flexible of circuit, and the number of devices in circuit greatly reduces, thus circuit realiration is more simple, and circuit cost is minimized.When the monitoring state using two-value input circuit 30 according to the present invention to signals such as such as multiple circuit breaker, switches, because the voltage range of multiple monitored signal can be consistent usually, a Threshold selection circuit 32 is so only set between circuit node CN and common port BI_COM and just can realizes Threshold selection function for each two-value input.Even if in the application scenario that the voltage range of multiple monitored signal is not quite identical, also can divide into groups to it according to the voltage range of monitored signal, and use according to two-value input circuit 30 of the present invention for the multiple monitored signal that voltage range is consistent.
Although be described based on protective circuit of the prior art and buffer circuit above, the present invention is not limited to this.Those skilled in the art should know, and under the prerequisite without prejudice to technical conceive of the present invention, also can adopt other any applicable protective circuit and buffer circuit according to two-value input circuit 30 of the present invention.
Fig. 4 shows the embodiment one of the Threshold selection circuit according to two-value input circuit of the present invention.As shown in Figure 4, in the present embodiment, described voltage-stabilizing device is voltage stabilizing didoe D383, and described switching device is wire jumper X1.Wire jumper X1 has three pins 1,2,3, when wire jumper X1 is in pin 2-pin 1 state (the first state), circuit node CN is communicated with by voltage stabilizing didoe D383 with common port BI_COM, when wire jumper X1 is in pin 2-pin 3 state (the second state), circuit node CN is communicated with by wire jumper X1 with common port BI_COM.
This shows, by arranging the different conditions of wire jumper X1, can select between circuit node CN and common port BI_COM, access voltage stabilizing didoe D383 or by D383 bypass.Because voltage stabilizing didoe D383 has the conducting voltage determined, therefore, just by between circuit node CN and common port BI_COM, access voltage stabilizing didoe D383 or by D383 bypass to realize the Threshold selection of input voltage.Further, only between circuit node CN and common port BI_COM, arrange a Threshold selection circuit, each input that namely can be two-value input circuit realizes Threshold selection, and circuit realiration is more simple, and circuit cost is minimized.
As shown in Figure 4, in the present embodiment, described Threshold selection circuit also can comprise a current limiting switch device: field effect transistor Q316, Q316 are in parallel with voltage stabilizing didoe D383.When the electric current flowing through voltage stabilizing didoe D383 is more than a threshold value, the pressure drop on resistance R462, more than grid source cut-in voltage (Vgs) of Q316, makes Q316 conducting.Because the internal resistance of Q316 is very little; electric current between circuit node CN and common port BI_COM will mainly flow through from Q316; thus in two-value input circuit, there is surge current or when multiple two-value input powers on simultaneously, Q316 can protect voltage stabilizing didoe D383 to be without prejudice.When the electric current flowing through voltage stabilizing didoe D383 does not exceed described threshold value, the grid voltage between source electrodes of Q316 does not reach the level of described cut-in voltage, and Q316 turns off.Therefore, the current-limiting protection effect of Q316 can not affect the normal work of described Threshold selection circuit.
As shown in Figure 4, in the present embodiment, described Threshold selection circuit also can comprise an electric capacity C407, the RC filter circuit that resistance R462 and electric capacity C407 is formed, with the cut-in voltage of level and smooth Q316.In addition, also can according to embody rule scene, for Q316 connects a current-limiting resistance R465 to share the power consumption of Q316.
Fig. 5 shows the embodiment two of the Threshold selection circuit according to two-value input circuit of the present invention.As shown in Figure 5; in the present embodiment; one identical with embodiment illustrated in fig. 4; described voltage-stabilizing device is voltage stabilizing didoe D383; field effect transistor Q316 is in parallel with voltage stabilizing didoe D383; in two-value input circuit, occur surge current in order to protect voltage stabilizing didoe D383 or be without prejudice when multiple two-value input powers on simultaneously, the RC filter circuit that resistance R462 and electric capacity C407 is formed is in order to the cut-in voltage of level and smooth Q316, and the current-limiting resistance R465 connected with Q316 is in order to share the power consumption of Q316.With embodiment illustrated in fig. 4 one unlike, described switching device is relay K 1.The control side (port one) of relay K 1 can be used for reception one control signal SWITCH, and under the control of control signal SWITCH, the controlled side (port 3 and port 4) of relay K 1 switches between turn-on and turn-off state.Specifically, when control signal SWITCH is low level, relay K 1 is off state (the first state).When relay K 1 is in off state, circuit node CN is communicated with by voltage stabilizing two pole D383 pipe with common port BI_COM.When control signal SWITCH is high level, relay K 1 is conducting state (the second state).When relay K 1 is in conducting state, circuit node CN is communicated with by relay K 1 with common port BI_COM.Compared to wire jumper X1, because control signal SWITCH can come from universal input/output (GPIO) port of a processor, therefore, can be switched by the state of software-controlled manner to relay K 1, thus be two-value input circuit selection threshold value, make the selection of threshold value more flexible, easy.
As shown in Figure 5, the control side (port 2) of relay K 1 is powered by power supply VCC.Consider that the control side rated voltage of relay K 1 is generally 5 volts.And the signal voltage of processor GPIO port is generally 3.3 volts, a triode Q5 can be adopted to carry out voltage transitions, the resistance of base biasing resistor R119 and R120 of triode Q5 can need to set according to embody rule.Can an electric capacity C83 in parallel in the base stage of triode Q5, in order to smooth voltage noise.In addition, on the collector electrode of triode Q5 also can a diode D393 in parallel to protect Q5.
Fig. 6 shows the embodiment three of the Threshold selection circuit according to two-value input circuit of the present invention.In the preferred embodiment, except described voltage-stabilizing device and described switching device, described Threshold selection circuit also comprises an isolating switch device, and described isolating switch device has control side and controlled side, described control side and controlled side electrical isolation, described controlled side is connected with described switching device.Under the control of the control signal of described control side, described controlled side switches between the third state and the 4th state, and when described controlled side is in the third state, described switching device is in the first state, when described controlled side is in the 4th state, described switching device is in the second state.As shown in Figure 6, in the present embodiment, described voltage-stabilizing device is voltage stabilizing didoe D383, and described switching device is field effect transistor Q318, and described isolating switch device is optocoupler U32.The control side (port 2) of optocoupler U32 can be connected with a GPIO port, for reception control signal SWITCH, the controlled side (port 3 and port 4) of optocoupler U32 is connected with the grid of field effect transistor D318, under the control of control signal SWITCH, described controlled side switches between turn-on and turn-off state.Specifically, when control signal SWITCH is high level, the controlled side of optocoupler U32 is off state (third state).When the controlled side of optocoupler U32 is in off state, field effect transistor Q318 is in off state (the first state), and circuit node CN is communicated with by voltage stabilizing didoe D383 with common port BI_COM.When control signal SWITCH is low level, the controlled side of optocoupler U32 is conducting state (the 4th state).When the controlled side of optocoupler U32 is in conducting state, the grid of field effect transistor Q318 is applied in a voltage, make field effect transistor Q318 conducting (the second state), circuit node CN is communicated with by field effect transistor Q318 with common port BI_COM.
Compared to relay K 1, optocoupler U32 volume is little, and safer, reliable, is therefore more conducive to the miniaturization of Threshold selection circuit, makes Threshold selection circuit safer, reliable.In addition, the state of optocoupler U32 switches also to be come to control with software mode by the GPIO port of processor, and the selection of threshold value is flexible, easy.
As shown in Figure 6, in the present embodiment, the control side (port one) of optocoupler U32 is powered by power supply VCC3V3, and the controlled side (port 4) of optocoupler U32 is by any one power supply in multiple two-value input.The multiple diode D1 be connected respectively with each two-value input, D2, Dn forms one or (OR) door, under the controlled side of optocoupler U32 is in conducting state, when any one two-value input powers on, the grid just by the controlled side direction field effect transistor Q318 of U32 applies described voltage, thus makes field effect transistor Q318 conducting.Each diode D1, D2 ..., the positive pole of Dn corresponding and each two-value input BI_1, BI_2 ..., BI_n is connected, to avoid electric current reverse flow to two-value input.Consider the surge current that may occur in two-value input, the controlled side of optocoupler U32 is parallel with a transient voltage suppressor D395, with the infringement protecting optocoupler U32 can not be subject to surge current.In addition, an electric capacity C434 in parallel and a resistance R558, electric capacity C434 and resistance R558 RC filter circuit can be formed, with smooth voltage noise between the grid of field effect transistor Q318 and source electrode.Port resistive R556, R557 and R559 that the control side of optocoupler U32 is connected with controlled side can choose according to embody rule demand.Field effect transistor Q316, electric capacity C407, resistance R462 are identical with the effect in embodiment illustrated in fig. 5 two with the effect of resistance R465, and related description with reference to content above, can not repeat them here.
Fig. 7 shows the embodiment four of the Threshold selection circuit according to two-value input circuit of the present invention.As shown in Figure 7, the present embodiment and embodiment illustrated in fig. 6 three difference be that described switching device is triode Q319.When control signal SWITCH is high level, the controlled side of optocoupler U32 is off state (third state).When the controlled side of optocoupler U32 is in off state, triode Q319 is in off state (the first state), and circuit node CN is communicated with by voltage stabilizing didoe D383 with common port BI_COM.When control signal SWITCH is low level, the controlled side of optocoupler U32 is conducting state (the 4th state).When the controlled side of optocoupler U32 is in conducting state, the base stage of triode Q319 is applied in a voltage, make triode Q319 conducting (the second state), circuit node CN is communicated with by triode Q319 with common port BI_COM.Although triode internal resistance is in the on-state bigger, and field effect transistor internal resistance is in the on-state almost negligible, but triode pressure drop in the on-state is still less than 0.3V, therefore, the Threshold selection requirement of two-value input circuit also can be met using triode Q319 replacement field effect transistor Q318 as described switching device.In the present embodiment, the effect of other device is identical with the effect in embodiment illustrated in fig. 6 three, and related description with reference to content above, can not repeat them here.
As Fig. 6 and replacement scheme embodiment illustrated in fig. 7, the controlled side of optocoupler U32 also can directly be powered by an insulating power supply, when the controlled side of optocoupler U32 is in conducting state, apply described voltage by described insulating power supply to the grid of field effect transistor Q318 or the base stage of triode Q319.
Those skilled in the art should understand that, although above with described voltage-stabilizing device for voltage stabilizing didoe D383 is exemplarily described, but the present invention is not limited to this, under the prerequisite without prejudice to technical conceive of the present invention, also can adopt the voltage-stabilizing device of other any applicable discrete component or integrated chip type according to two-value input circuit of the present invention.In addition, described current limiting switch device is also not limited to field effect transistor Q316, such as, triode, thyristor, IGBI or relay also can be adopted in parallel with described voltage-stabilizing device, to realize the effect of current-limiting protection.
To further illustrate two-value input circuit according to the present invention for the circuit of Threshold selection shown in Fig. 6 below.Fig. 8 shows a specific embodiment according to two-value input circuit of the present invention.As shown in Figure 8, this two-value input circuit comprises 8 two-value input BI_1 to BI_8 and common port BI_COM, two-value input BI_1 to BI_8 is connected (because the circuit part of each two-value input is identical by circuit node CN with common port BI_COM, for clarity sake, illustrate only the circuit part of two-value input BI_8 in figure).The signal that each two-value input obtains is converted into the discernible level signal of processor (not shown) through protective circuit 11 and buffer circuit 13 and exports.Threshold selection circuit 32 is connected between circuit node CN and common port BI_COM, for selecting the threshold value adapted with the input voltage range of two-value input BI_1 to BI_8.
Protective circuit 11 comprises surge protection circuit, voltage stabilizing circuit and current-limiting protection circuit.Surge protection circuit comprises surge absorbing circuit and surge circuit further; wherein; surge absorbing circuit is made up of transient voltage suppressor D73; it is connected between two-value input BI_8 and common port BI_COM, for absorbing the disturbance of the electric energy such as the surge current that occurs in two-value input.In a particular application, the protection device such as gas discharge tube or piezo-resistance also can be used to replace transient voltage suppressor.Surge circuit comprises diode D366, current-limiting resistance R516, storage capacitor C421 and bleeder resistance R515, connects also and then connects with diode D366 after storage capacitor C421 and bleeder resistance R515 parallel connection with current-limiting resistance R516.On the branch road of this surge circuit in parallel between M12 and circuit node CN, during for occurring the Power Disturbances such as surge current in two-value input, provide the path of releasing of an electric energy.Storage capacitor C421 has large capacitance, and therefore, diode D366, current-limiting resistance R516 and storage capacitor C421 constitute a low-impedance path for surge current, and storage capacitor C421 is rapidly charged.After surge, due to the one-way conduction characteristic of diode D366, electric energy stored by C421 can only be released by bleeder resistance R515, thus the surge current occurred in two-value input is released fast, especially for the Power Disturbance of the long period such as residual voltage of surge test, this surge circuit is simple, effectively.Voltage stabilizing circuit comprises voltage stabilizing didoe D364 and D363, and it is connected between two-value input BI_8 and circuit node CN, for the voltage between stable two-value input BI_8 and common port BI_COM.Current-limiting protection circuit comprises depletion type PNP field effect transistor M12 and resistance R520, M12 are connected between voltage stabilizing didoe D364 and D363, and resistance R520 is connected between the source electrode of M12 and grid.By R520, can form Current Negative Three-Point Capacitance for depletion type PNP field effect transistor M12, the electric current namely flowing through R520 increases, then the negative voltage pressure reduction between M12 grid source increases, and thus M12 trends towards turning off, and the electric current of M12 reduces, thus realizes the effect of current limliting.
Protective circuit 11 also can comprise triode Q311 further.Q311 and voltage stabilizing didoe D363 is in parallel, for the protection of D363.Also can arrange a RC filter circuit between the base stage of triode Q311 and emitter, this RC filtered electrical routing capacitance C422 and resistance R518 is formed, for smooth voltage noise.The resistance R519 of depletion type PNP field effect transistor M12 and the collector resistance R517 of triode Q311 can be arranged according to embody rule.
In addition; protective circuit 11 also comprises diode D365 and inductance L 19 and L24 further; diode D365 and be connected between two-value input BI_8 and depletion type PNP field effect transistor M12; for preventing the reversal connection of two-value input; inductance L 19 and L24 are connected with common port BI_COM with two-value input BI_8 respectively, for the high frequency voltage noise in filtering two-value input and common port.
Buffer circuit 13 comprises optocoupler U29 and Schmidt trigger U20F.Optocoupler U29 is used for signal coupling between the circuit part of two-value input and the signal processing of processor and electrical isolation.After Schmidt trigger U20F is series at optocoupler U29, for strengthening the signal being transferred to processor, and cut down the noise be transferred in the signal of processor.Electric capacity C103 is connected to the input of U20F, for smooth voltage noise.Resistance R170 and R172 can be arranged according to embody rule.
Threshold selection circuit 32 adopts embodiment as shown in Figure 6, and it comprises voltage stabilizing didoe D383, field effect transistor Q318 and optocoupler U32.The control side (port 2) of optocoupler U32 can be connected with a GPIO port, and for reception control signal SWITCH, the controlled side (port 3 and port 4) of optocoupler U32 is connected with the grid of field effect transistor D318.When control signal SWITCH is high level, the controlled side of optocoupler U32 is off state (third state).When the controlled side of optocoupler U32 is in off state, field effect transistor Q318 is in off state (the first state), and circuit node CN is communicated with by voltage stabilizing didoe D383 with common port BI_COM.When control signal SWITCH is low level, the controlled side of optocoupler U32 is conducting state (the 4th state).When the controlled side of optocoupler U32 is in conducting state, the grid of field effect transistor Q318 is applied in a voltage, make field effect transistor Q318 conducting (the second state), circuit node CN is communicated with by field effect transistor Q318 with common port BI_COM.
The control side (port one) of optocoupler U32 is powered by power supply VCC3V3, and the controlled side (port 4) of optocoupler U32 is by any one power supply in 8 two-value inputs.Two-value input BI_1 to BI_8 is corresponding connection diode D385 to D392 respectively, these 8 diodes form one or (OR) door, under the controlled side of optocoupler U32 is in conducting state, when any one two-value input powers on, just the grid by the controlled side direction field effect transistor Q318 of U32 applies described voltage, thus make field effect transistor Q318 conducting, and avoid electric current reverse flow to two-value input.The related description of other device all can refer to above for the explanation of Fig. 6, does not repeat them here.
Under the control of control signal SWITCH, the threshold value of two-value input BI_8 has two kinds of selections listed by table one:
Table one
| SWITCH | U32 | Threshold voltage V thr |
| Low level | Conducting | V D365+V D364+V R520+V D363+V Q311_BE+V U29 |
| High level | Turn off | V D365+V D364+V R520+V D363+V Q311_BE+V U29+V D383+V R462 |
If two kinds of nominal input voltage of setting two-value input BI_8 are Vn1 and Vn2 (as 24 volts and 48 volts), pick-up voltage interval is x
1% ~ x
2% (such as in China, this pick-up voltage interval is generally 55% ~ 70%), also namely in rated voltage Vn1 situation:
If the input voltage of two-value input BI_8 is equal to or greater than Vn1*x
2%, then two-value input circuit should export high level;
If the input voltage of two-value input BI_8 is in Vn1*x
1% and Vn1*x
2between %, then the exportable high level of two-value input circuit or low level;
If the input voltage of two-value input BI_8 lower than or be greater than Vn1*x
1%, then two-value input circuit should output low level.
In rated voltage Vn2 situation:
If the input voltage of two-value input BI_8 is equal to or greater than Vn2*x
2%, then two-value input circuit should export high level;
If the input voltage of two-value input BI_8 is in Vn2*x
1% and Vn2*x
2between %, then the exportable high level of two-value input circuit or low level;
If the input voltage of two-value input BI_8 lower than or be greater than Vn2*x
1%, then two-value input circuit should output low level.
Therefore, suitable voltage stabilizing didoe D383 can be chosen according to following formula, Threshold selection circuit 32 just can be utilized to select two kinds of different threshold values for two-value input BI_8, wherein, every symbol V in formula
d365to V
r462represent the pressure drop of corresponding each device respectively.
Vn1×x
2％＞V
D365+V
D364+V
R520+V
D363+V
Q311_BE+V
U29≥Vn1×x
1％
Vn2×x
2％＞V
D365+V
D364+V
R520+V
D363+V
Q311_BE+V
U29+V
D383+V
R462≥Vn2×x
1％
Those skilled in the art should understand that; in the specific embodiment of two-value input circuit shown in above-mentioned Fig. 8; although on the branch road of the surge circuit in parallel in protective circuit 11 after depletion type PNP field effect transistor M12; to be reduced the voltage withstand class of storage capacitor C421 by the metering function of M12, but the present invention is not limited to this.Such as, this surge circuit also can be connected in parallel on the branch road between two-value input BI_8 and circuit node CN.In addition, depletion type PNP field effect transistor M12 is also not limited to be connected between voltage stabilizing didoe D364 and D363, such as, before it also can be connected on D363.
Those skilled in the art should understand that, although this specification describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, technical scheme in each embodiment also through appropriately combined, can form other execution mode that it will be appreciated by those skilled in the art that.
The foregoing is only exemplifying embodiment, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Claims (12)
1. a two-value input circuit (30), it comprises multiple two-value input (BI_1, BI_2, BI_n) and one common port (BI_COM), described multiple two-value input (BI_1, BI_2,, BI_n) be connected with described common port (BI_COM) by same circuit node (CN); It is characterized in that: described two-value input circuit (30) comprises a Threshold selection circuit (32), this Threshold selection circuit (32) is connected between described circuit node (CN) and described common port (BI_COM); Described Threshold selection circuit (32) comprises a voltage-stabilizing device (321) and a switching device (322), and described voltage-stabilizing device (321) is in parallel with described switching device (322); When described switching device (322) is in the first state, described circuit node (CN) is communicated with by described voltage-stabilizing device (321) with described common port (BI_COM), when described switching device (322) is in the second state, described circuit node (CN) is communicated with by described switching device (322) with described common port (BI_COM).
2. two-value input circuit as claimed in claim 1, it is characterized in that: described Threshold selection circuit (32) also comprises a current limiting switch device (Q316), described current limiting switch device (Q316) is in parallel with described voltage-stabilizing device (321); When the electric current flowing through described voltage-stabilizing device (321) is more than a threshold value, the conducting of described current limiting switch device (Q316), otherwise described current limiting switch device (Q316) turns off.
3. two-value input circuit as claimed in claim 1, it is characterized in that: described voltage-stabilizing device is voltage stabilizing didoe (D383), described switching device is wire jumper (X1); Described wire jumper (X1) has three pins, when described wire jumper (X1) is in pin 2-pin 1 state, described circuit node (CN) is communicated with by described voltage stabilizing didoe (D383) with described common port (BI_COM), when described wire jumper (X1) is in pin 2-pin 3 state, described circuit node (CN) is communicated with by described wire jumper (X1) with described common port (BI_COM).
4. two-value input circuit as claimed in claim 1, it is characterized in that: described voltage-stabilizing device is voltage stabilizing didoe (D383), described switching device is relay (K1), the control side of described relay (K1) is for receiving a control signal (SWITCH), under the control of described control signal (SWITCH), described relay (K1) switches between turn-on and turn-off state, when described relay (K1) is in off state, described circuit node (CN) is communicated with by described voltage stabilizing didoe (D383) with described common port (BI_COM), when described relay (K1) is in conducting state, described circuit node (CN) is communicated with by described relay (K1) with described common port (BI_COM).
5. two-value input circuit as claimed in claim 1, it is characterized in that: described Threshold selection circuit (32) also comprises an isolating switch device, described isolating switch device has control side and controlled side, described control side and controlled side electrical isolation, described controlled side is connected with described switching device (322); Under the control of the control signal of described control side, described controlled side switches between the third state and the 4th state, when described controlled side is in the third state, described switching device (322) is in the first state, when described controlled side is in the 4th state, described switching device (322) is in the second state.
6. two-value input circuit as claimed in claim 5, it is characterized in that: described voltage-stabilizing device is voltage stabilizing didoe (D383), described switching device is field effect transistor (Q318), and described isolating switch device is optocoupler (U32), the control side of described optocoupler (U32) is for receiving described control signal (SWITCH), and the controlled side of described optocoupler (U32) is connected with the grid of described field effect transistor (Q318), under the control of described control signal (SWITCH), described controlled side switches between turn-on and turn-off state, when described controlled side is in off state, described field effect transistor (Q318) is in off state, described circuit node (CN) is communicated with by described voltage stabilizing didoe (D383) with described common port (BI_COM), when described controlled side is in conducting state, the grid of described field effect transistor (Q318) is applied in a voltage, make described field effect transistor (Q318) conducting, described circuit node (CN) is communicated with by described field effect transistor (Q318) with described common port (BI_COM).
7. two-value input circuit as claimed in claim 6, is characterized in that: the controlled side of described optocoupler (U32) is by any one power supply in described multiple two-value input; When described controlled side is in conducting state, apply described voltage by the two-value input of powering for described controlled side to the grid of described field effect transistor (Q318).
8. two-value input circuit as claimed in claim 5, it is characterized in that: described voltage-stabilizing device is voltage stabilizing didoe (D383), described switching device is triode (Q319), and described isolating switch device is optocoupler (U32); The control side of described optocoupler (U32) is for receiving described control signal (SWITCH), and the controlled side of described optocoupler (U32) is connected with the base stage of described triode (Q319); Under the control of described control signal (SWITCH), described controlled side switches between turn-on and turn-off state, when described controlled side is in off state, described triode (Q319) is in off state, described circuit node is communicated with by described voltage stabilizing didoe (D383) with described common port, when described controlled side is in conducting state, the base stage of described triode (Q319) is applied in a voltage, make described triode (Q319) conducting, described circuit node is communicated with by described triode (Q319) with described common port.
9. two-value input circuit as claimed in claim 8, is characterized in that: the controlled side of described optocoupler (U32) is by any one power supply in described multiple two-value input; When described controlled side is in conducting state, apply described voltage by the two-value input of powering for described controlled side to the base stage of described triode (Q319).
10. the two-value input circuit as described in claim 7 or 9, it is characterized in that: described Threshold selection circuit also comprises a transient voltage suppressor (D395), described transient voltage suppressor is in parallel with the controlled side of described optocoupler (U32).
11. two-value input circuits as claimed in claim 1, is characterized in that: described two-value input circuit also comprises multiple surge circuit, wherein, the branch road between each two-value input and described circuit node are parallel with a surge circuit; Each surge circuit comprises an one way conducting device (D366), a current-limiting resistance (R516), a storage capacitor (C421) and a bleeder resistance (R515), connects also and then connects with described one way conducting device (D366) after described storage capacitor (C421) and described bleeder resistance (R515) parallel connection with described current-limiting resistance (R516).
12. two-value input circuits as claimed in claim 1, it is characterized in that: described two-value input circuit is current-limiting type two-value input circuit, wherein, at each two-value input (BI_1, BI_2,, BI_n) and described circuit node between (CN) branch road in be in series with a depletion type PNP field effect transistor (M12).
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| CN201410462569.XA CN105471419B (en) | 2014-09-11 | 2014-09-11 | Two-value input circuit |
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| CN201410462569.XA CN105471419B (en) | 2014-09-11 | 2014-09-11 | Two-value input circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0323619A2 (en) * | 1987-12-24 | 1989-07-12 | Nec Corporation | Circuit for comparing a plurality of binary inputs |
| CN101964653A (en) * | 2009-07-24 | 2011-02-02 | 南京南瑞继保电气有限公司 | Switching value input circuit |
| US20130002288A1 (en) * | 2010-01-29 | 2013-01-03 | Infineon Technologies Ag | Electronic Circuit Arrangement for Processing Binary Input Values |
| CN202798651U (en) * | 2012-04-24 | 2013-03-13 | 西门子电力自动化有限公司 | Binary input circuit |
| CN103378847A (en) * | 2012-04-24 | 2013-10-30 | 西门子电力自动化有限公司 | Binary input circuit |
| CN203786501U (en) * | 2013-10-31 | 2014-08-20 | 西门子电力自动化有限公司 | Binary input circuit |
-
2014
- 2014-09-11 CN CN201410462569.XA patent/CN105471419B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0323619A2 (en) * | 1987-12-24 | 1989-07-12 | Nec Corporation | Circuit for comparing a plurality of binary inputs |
| CN101964653A (en) * | 2009-07-24 | 2011-02-02 | 南京南瑞继保电气有限公司 | Switching value input circuit |
| US20130002288A1 (en) * | 2010-01-29 | 2013-01-03 | Infineon Technologies Ag | Electronic Circuit Arrangement for Processing Binary Input Values |
| CN202798651U (en) * | 2012-04-24 | 2013-03-13 | 西门子电力自动化有限公司 | Binary input circuit |
| CN103378847A (en) * | 2012-04-24 | 2013-10-30 | 西门子电力自动化有限公司 | Binary input circuit |
| CN203786501U (en) * | 2013-10-31 | 2014-08-20 | 西门子电力自动化有限公司 | Binary input circuit |
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| CN105471419B (en) | 2019-01-25 |
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