CN104820457A - Voltage adaptive multi-channel digital input board card - Google Patents
Voltage adaptive multi-channel digital input board card Download PDFInfo
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- CN104820457A CN104820457A CN201510219808.3A CN201510219808A CN104820457A CN 104820457 A CN104820457 A CN 104820457A CN 201510219808 A CN201510219808 A CN 201510219808A CN 104820457 A CN104820457 A CN 104820457A
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Abstract
The invention provides a voltage adaptive multi-channel digital input (DI) board card. Two circuits are specifically provides, one is a wide voltage adaptive DI circuit when applied to active node input, and the other one is a DI circuit powered by a double redundant power supply when applied to inactive node input; the two circuits can realize board card adaptation during wide voltage input while the complexity and cost of input circuit are hardly increased. The board card also has the advantages of stability and reliability of the circuit, and can be widely applied to a control system with digital isolation input requirement.
Description
Technical field
The invention belongs to digital quantity input technology field, be specifically related to a kind of voltage adaptive Multipath digital quantity input card.
Background technology
Along with computer control system is applied more and more widely, as connecting the number connect test technology of peripherals to one of control system Main Means, also fast-developing, stable ripe.
But the digital input circuit used at present, is adopt relay or optocoupler to add the patterns such as resistance mostly, is difficult to the requirement adapting to Width funtion input.Such as, at the scene in input application, conventional input voltage has 24VDC, 110VDC and 220VDC, common mode is: weld different elements to same board, to mate different input voltage, cause production stock kind many thus, add manufacture and testing cost, as onsite application is improper, digital quantity input can be caused to burn toward contact and maybe cannot drive use.
Summary of the invention
For the defect that prior art exists, the invention provides a kind of voltage adaptive Multipath digital quantity input card, can effectively solve the problem.
The technical solution used in the present invention is as follows:
The invention provides a kind of voltage adaptive Multipath digital quantity input card, wide pressure adaptation DI circuit when being applied to active node input, comprising: the 1st Circuit tuning, the 2nd Circuit tuning, comparator circuit, protection and filtering circuit, buffer circuit and export indicating circuit;
Described 1st Circuit tuning is connected on the positive terminal of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 1st level;
Described 2nd Circuit tuning is connected on the negative pole end of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 2nd level; Wherein, when significant figure amount inputs, described 2nd level perseverance is less than described 1st level;
Described comparator circuit is used for comparing the 1st level and whether is greater than the 2nd level; and when the 1st level is greater than the 2nd level; described comparator circuit exports high level; described high level, after described protection and filtering circuit and described buffer circuit process, drives described output indicating circuit to carry out signal prompt.
Preferably, described 1st Circuit tuning comprises the 1st mu balanced circuit and bleeder circuit of series connection; Described 2nd Circuit tuning is voltage stabilizing reference circuit; In the ideal case, when significant figure amount inputs, for the digital quantity input signal of any range voltage, its level after described 1st mu balanced circuit and bleeder circuit process, perseverance is greater than the level of this digital quantity input signal after the process of described voltage stabilizing reference circuit.
Preferably, described 1st mu balanced circuit is used for described digital quantity input signal to be stabilized in magnitude of voltage U1;
The voltage that described bleeder circuit is used for described 1st mu balanced circuit exports carries out dividing potential drop, obtains the magnitude of voltage that described comparator circuit can bear; Wherein, described bleeder circuit comprises the 5th divider resistance R5 and the 7th divider resistance R7; 5th divider resistance R5 is connected on the positive terminal of the 1st mu balanced circuit and comparator circuit; One end of 7th divider resistance R7 is connected on the circuit between the 5th divider resistance R5 and comparator circuit positive terminal, the other end ground connection of the 7th divider resistance R7;
Described voltage stabilizing reference circuit is used for described digital quantity input signal to be stabilized in magnitude of voltage U2;
Further, following relational expression need be met: U1*R7/ (R7+R5) > U2.
Preferably, also comprise: self-powered and power supply protection circuit; The input end of described self-powered and power supply protection circuit is connected with described digital-quantity input interface; The output terminal of described self-powered and power supply protection circuit is connected with filtering circuit and described buffer circuit with described comparator circuit, described protection respectively.
Preferably, described self-powered and power supply protection circuit comprise: the 2nd mu balanced circuit, overvoltage crowbar D3 and filter capacitor C1;
Described 2nd mu balanced circuit is connected on digital-quantity input interface and is powered between device, for being powered the voltage that device can bear described in the signal source provided from described digital-quantity input interface being stabilized in; Described overvoltage crowbar D3 and described filter capacitor C1 is all in parallel with described 2nd mu balanced circuit.
The present invention also provides a kind of voltage adaptive Multipath digital quantity input card, be applied to the DI circuit that when passive bus inputs, two-way redundant power is powered, comprise: the 1st road input power Vccin1, the 2nd road input power Vccin2, double loop power supply input automatic switch-over circuit, signal conditioning circuit, the 3rd mu balanced circuit, passive number amount node S1, protection and filtering circuit, buffer circuit and export indicating circuit;
Described double loop power supply input automatic switch-over circuit, comprising: relay K 1 and relay feed circuit; Described double loop power supply input automatic switch-over circuit is used for: when the 1st road input power Vccin1 has electricity, 1st road input power Vccin1 powers to relay feed circuit, and, relay feed circuit are according to the magnitude of voltage of the 1st road input power Vccin1, self-adaptation goes out the operating voltage of relay K1, and power to relay K 1, relay K 1 and then adhesive, thus the 1st road input power Vccin1 conducting is linked into signal conditioning circuit;
And when when the 1st road input power Vccin1 power-off, the 2nd road input power Vccin2 has an electricity, 1st road input power Vccin1 power-off and cause the power-off of relay feed circuit, and then make relay K 1 power down, relay K 1 normally closed contact access the 2nd road input power Vccin2, thus make the 2nd road input power Vccin2 conducting and be linked into signal conditioning circuit;
By unified referred to as input power Vccink to the 1st road input power Vccin1 or the 2nd road input power Vccin2 that are linked into signal conditioning circuit; Input power Vccink, after signal conditioning circuit process, obtains input power Vcc;
The output terminal of input power Vcc is by the 3rd mu balanced circuit, be connected to one end of described passive number amount node S1, the other end of described passive number amount node S1 by after described protection and filtering circuit, described buffer circuit, is connected to described output indicating circuit successively;
When described passive number amount node S1 inputs pass information, input power Vcc is stabilized to a magnitude of voltage by the 3rd mu balanced circuit, and by after described protection and filtering circuit and described buffer circuit, drives described output indicating circuit to carry out signal prompt;
And when information is opened in described passive number amount node S1 input, input power Vcc and described protection and filtering circuit are off state, now, described output indicating circuit does not carry out signal prompt.
Preferably, when the 1st road input power Vccin1 has electricity, for double loop power supply input automatic switch-over circuit, in the following manner, realize the operating voltage magnitude of voltage self-adaptation of the 1st road input power Vccin1 being gone out relay K1:
1st power supply interface of relay K 1 is connected with the 1st road input power Vccin1, and the 2nd power supply interface of relay K 1 is connected in parallel ground connection after 3 power supply branch roads; Wherein, the 1st power supply branch road be the 1st power switch pipe Q1, the 2nd power supply branch road be the 20th divider resistance R20, the 3rd power supply branch road be series connection the 25th divider resistance R25 and the 2nd power switch pipe Q2; Further, the 20th divider resistance R20 is greater than the 25th divider resistance R25;
Described double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1.
Preferably, described double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1, be specially:
By the voltage range of the 1st road input power Vccin1, be divided into three intervals, from small to large ord, be designated as successively: low-pressure area, middle nip and higher-pressure region;
When the 1st road input power Vccin1 is low-pressure area, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is conducting state, now, to relay K 1 power the 1st road input power Vccin1 after relay K 1, by the direct ground connection of the 1st power switch pipe Q1, therefore, the 1st road input power Vccin1 powers directly to relay K 1; The supply voltage of relay K 1 equals the magnitude of voltage of the 1st road input power Vccin1;
When the 1st road input power Vccin1 is middle nip, controlling the 1st power switch pipe Q1 is off state, controlling the 2nd power switch pipe Q2 is conducting state, now, to the 1st road input power Vccin1 ground connection after the 20th divider resistance R20 and the 25th divider resistance R25 dividing potential drop of parallel connection that relay K 1 is powered; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20 in parallel and the 25th divider resistance R25, the voltage obtained is to relay K 1 supply voltage;
When the 1st road input power Vccin1 is higher-pressure region, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is off state, now, the 1st road input power Vccin1 powered to relay K 1 is after relay K 1, again by after the 20th divider resistance R20, just ground connection; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20, the voltage obtained is to relay K 1 supply voltage.
Preferably, described double loop power supply input automatic switch-over circuit, comprises Q1 state control circuit and Q2 state control circuit;
Described Q1 state control circuit comprises:
3-1 mu balanced circuit, 3-2 mu balanced circuit, 3-3 bleeder circuit and 4A comparator circuit U4A;
Described 3-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4A comparator circuit U4A; For being voltage U 3-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of described 3-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 3-3 bleeder circuit, is connected to the negative pole end of 4A comparator circuit U4A;
It is voltage U 3-2 that described 3-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 3-2, after 3-3 bleeder circuit dividing potential drop, obtains voltage U 3-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 3-1 is constant; And voltage U 3-3 raises gradually, by the parameter designing to Q1 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage is low-pressure area, voltage U 3-3 is less than voltage U 3-1; When the 1st road input power Vccin1 voltage be middle nip or higher-pressure region time, voltage U 3-3 is greater than voltage U 3-1;
Described Q2 state control circuit comprises:
4-1 mu balanced circuit, 4-2 mu balanced circuit, 4-3 bleeder circuit and 4B comparator circuit U4B;
Described 4-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4B comparator circuit U4B; For being voltage U 4-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of described 4-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 4-3 bleeder circuit, is connected to the negative pole end of 4B comparator circuit U4B;
It is voltage U 4-2 that described 4-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 4-2, after 4-3 bleeder circuit dividing potential drop, obtains voltage U 4-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 4-1 is constant; And voltage U 4-3 raises gradually, by the parameter designing to Q2 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage be low-pressure area and middle nip time, voltage U 4-3 is less than voltage U 4-1; When the 1st road input power Vccin1 voltage is higher-pressure region, voltage U 4-3 is greater than voltage U 4-1.
Preferably, also comprise: described Q1 state control circuit also comprises: self-powered and power supply protection circuit; Described self-powered and power supply protection circuit are used for: by the voltage stabilization of the 1st road input power Vccin1 a definite value, and power to the electricity consumption device of Q1 state control circuit.
Voltage adaptive Multipath digital quantity input card provided by the invention has the following advantages:
Be applied in the digital quantity input occasion of insulation request, can while increasing input circuit complicacy and cost hardly, realize the board self-adaptation of wide pressure input, and, also there is the reliable advantage of circuit stability, can extensively should in the control system having the requirement of digital quantity Isolation input.
Accompanying drawing explanation
Fig. 1 is the voltage adaptive Multipath digital quantity input card circuit theory diagrams being applied to active node provided by the invention;
Fig. 2 is the voltage adaptive Multipath digital quantity input card circuit theory diagrams being applied to active node provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
The present invention relates to a kind of voltage adaptive Multipath digital quantity input card, be applied in the digital quantity input occasion of insulation request, the input of direct current Width funtion can be realized, according to the need of dual power supply redundancy input and, realizing circuit is divided into two kinds, in two kinds of circuit, relate to more identical point, and all can realize the input of voltage adaptive Multipath digital quantity.Below these two kinds of circuit are introduced respectively in detail:
(1) during active node input, wide pressure adapts to DI circuit
As shown in Figure 1, wide pressure adaptation DI circuit during for being applied to active node input, comprising: the 1st Circuit tuning, the 2nd Circuit tuning, comparator circuit, protection and filtering circuit, buffer circuit and export indicating circuit;
1st Circuit tuning is connected on the positive terminal of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 1st level;
2nd Circuit tuning is connected on the negative pole end of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 2nd level; Wherein, when significant figure amount inputs, the 2nd level perseverance is less than the 1st level;
Comparator circuit is used for comparing the 1st level and whether is greater than the 2nd level; and when the 1st level is greater than the 2nd level; comparator circuit exports high level; high level is after protection with filtering circuit and buffer circuit process; driver output indicating circuit carries out signal prompt, and for the follow-up control module etc. that may connect.
As can be seen here, in the present invention, introduce comparator circuit cleverly, by the control to comparator circuit both positive and negative polarity input signal, achieve when significant figure amount inputs, comparer negative pole end level perseverance is less than positive terminal level, therefore, ideally, for the digital quantity input signal of any voltage, comparer all exports high level, thus driver output indicating circuit carries out signal prompt.Thus achieve Width funtion input.In practical application, due to some restrictions of adopted electrical part character, under normal circumstances, the input of 20VDC ~ 250VDC Width funtion can be met, therefore, in on-the-spot input application, conventional input voltage 24VDC, 110VDC and 220VDC etc., all can directly apply in the present invention.
Based on above-mentioned thought, below introduce a kind of concrete circuit form:
With reference to figure 1, the 1st Circuit tuning comprises the 1st mu balanced circuit and bleeder circuit of series connection; 2nd Circuit tuning is voltage stabilizing reference circuit; In the ideal case, when significant figure amount inputs, for the digital quantity input signal of any range voltage, its level after the 1st mu balanced circuit and bleeder circuit process, perseverance is greater than the level of this digital quantity input signal after the process of voltage stabilizing reference circuit.
Concrete, the 1st mu balanced circuit is used for digital quantity input signal to be stabilized in magnitude of voltage U1;
The voltage that bleeder circuit is used for the 1st mu balanced circuit exports carries out dividing potential drop, obtains the magnitude of voltage that comparator circuit can bear; Wherein, bleeder circuit comprises the 5th divider resistance R5 and the 7th divider resistance R7; 5th divider resistance R5 is connected on the positive terminal of the 1st mu balanced circuit and comparator circuit; One end of 7th divider resistance R7 is connected on the circuit between the 5th divider resistance R5 and comparator circuit positive terminal, the other end ground connection of the 7th divider resistance R7;
Voltage stabilizing reference circuit is used for digital quantity input signal to be stabilized in magnitude of voltage U2;
Further, following relational expression need be met: U1*R7/ (R7+R5) > U2.
That is, for circuit shown in Fig. 1, as long as design U1*R7/ (R7+R5) > is U2, all can realize when significant figure amount inputs, comparator circuit positive terminal level perseverance is greater than negative pole end level, exports high level, thus can driving isolation optocoupler U2 luminous, then exporting IN1 is high level, and D4 is lit.
In Fig. 1, R2 is pull-up resistor, provides optocoupler driving voltage electric current.D5 is the transient voltage suppressor diode of protection optocoupler overvoltage, and R4 and C2 forms low-pass filter circuit.Circuit has certain antijamming capability, and circuit working electric current is mA and uA, can effectively reduce from getting energy input signal.
In addition, in FIG, also comprise: self-powered and power supply protection circuit; The input end of self-powered and power supply protection circuit is connected with digital-quantity input interface; The output terminal of self-powered and power supply protection circuit respectively with comparator circuit, protect and be connected with filtering circuit and buffer circuit.
In specific implementation, self-powered and power supply protection circuit comprise: the 2nd mu balanced circuit, overvoltage crowbar D3 and filter capacitor C1;
2nd mu balanced circuit is connected on digital-quantity input interface and is powered between device, for the signal source provided from digital-quantity input interface being stabilized in the voltage being powered device and can bearing; Overvoltage crowbar D3 and filter capacitor C1 is all in parallel with the 2nd mu balanced circuit.
By self-powered and power supply protection circuit, input circuit complicacy and cost can be reduced.
(2) the DI circuit that when passive bus inputs, two-way redundant power is powered is applied to
In the system of high reliability request, the input power of active node needs two-way redundancy backup, now can adopt the automatic switchover of the input power of circuit realiration shown in Fig. 2 and the digital quantity input of Width funtion.
Concrete, comprising: the 1st road input power Vccin1, the 2nd road input power Vccin2, double loop power supply input automatic switch-over circuit, signal conditioning circuit, the 3rd mu balanced circuit, passive number amount node S1, protection and filtering circuit, buffer circuit and export indicating circuit;
Double loop power supply input automatic switch-over circuit, comprising: relay K 1 and relay feed circuit; Double loop power supply input automatic switch-over circuit is used for: when the 1st road input power Vccin1 has electricity, 1st road input power Vccin1 powers to relay feed circuit, and, relay feed circuit are according to the magnitude of voltage of the 1st road input power Vccin1, self-adaptation goes out the operating voltage of relay K1, and power to relay K 1, relay K 1 and then adhesive, thus the 1st road input power Vccin1 conducting is linked into signal conditioning circuit;
And when when the 1st road input power Vccin1 power-off, the 2nd road input power Vccin2 has an electricity, 1st road input power Vccin1 power-off and cause the power-off of relay feed circuit, and then make relay K 1 power down, relay K 1 normally closed contact access the 2nd road input power Vccin2, thus make the 2nd road input power Vccin2 conducting and be linked into signal conditioning circuit;
By unified referred to as input power Vccink to the 1st road input power Vccin1 or the 2nd road input power Vccin2 that are linked into signal conditioning circuit; Input power Vccink, after signal conditioning circuit process, obtains input power Vcc;
The output terminal of input power Vcc, by the 3rd mu balanced circuit, is connected to one end of passive number amount node S1, and the other end of passive number amount node S1 by after protection and filtering circuit, buffer circuit, is connected to output indicating circuit successively;
When passive number amount node S1 inputs pass information, input power Vcc is stabilized to a magnitude of voltage by the 3rd mu balanced circuit, and by after protection and filtering circuit and buffer circuit, driver output indicating circuit carries out signal prompt;
And when information is opened in passive number amount node S1 input, input power Vcc and protection and filtering circuit are off state, now, export indicating circuit and do not carry out signal prompt.
Visible, by foregoing circuit, both achieve input power two-way redundancy backup, also realize the wide pressure self-adaptation to input power.
Concrete, for the core of foregoing circuit, when the 1st road input power Vccin1 has electricity, for double loop power supply input automatic switch-over circuit, in the following manner, realize the operating voltage magnitude of voltage self-adaptation of the 1st road input power Vccin1 being gone out relay K1:
1st power supply interface of relay K 1 is connected with the 1st road input power Vccin1, and the 2nd power supply interface of relay K 1 is connected in parallel ground connection after 3 power supply branch roads; Wherein, the 1st power supply branch road be the 1st power switch pipe Q1, the 2nd power supply branch road be the 20th divider resistance R20, the 3rd power supply branch road be series connection the 25th divider resistance R25 and the 2nd power switch pipe Q2; Further, the 20th divider resistance R20 is greater than the 25th divider resistance R25;
Double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1.
More specifically, double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1, realize in the following ways:
By the voltage range of the 1st road input power Vccin1, be divided into three intervals, from small to large ord, be designated as successively: low-pressure area, middle nip and higher-pressure region;
When the 1st road input power Vccin1 is low-pressure area, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is conducting state, now, to relay K 1 power the 1st road input power Vccin1 after relay K 1, by the direct ground connection of the 1st power switch pipe Q1, therefore, the 1st road input power Vccin1 powers directly to relay K 1; The supply voltage of relay K 1 equals the magnitude of voltage of the 1st road input power Vccin1;
When the 1st road input power Vccin1 is middle nip, controlling the 1st power switch pipe Q1 is off state, controlling the 2nd power switch pipe Q2 is conducting state, now, to the 1st road input power Vccin1 ground connection after the 20th divider resistance R20 and the 25th divider resistance R25 dividing potential drop of parallel connection that relay K 1 is powered; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20 in parallel and the 25th divider resistance R25, the voltage obtained is to relay K 1 supply voltage;
When the 1st road input power Vccin1 is higher-pressure region, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is off state, now, the 1st road input power Vccin1 powered to relay K 1 is after relay K 1, again by after the 20th divider resistance R20, just ground connection; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20, the voltage obtained is to relay K 1 supply voltage.
Concrete again, for double loop power supply input automatic switch-over circuit, with reference to figure 1, its concrete circuit structure is: comprise Q1 state control circuit and Q2 state control circuit;
Q1 state control circuit comprises:
3-1 mu balanced circuit, 3-2 mu balanced circuit, 3-3 bleeder circuit and 4A comparator circuit U4A;
3-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4A comparator circuit U4A; For being voltage U 3-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of 3-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 3-3 bleeder circuit, is connected to the negative pole end of 4A comparator circuit U4A;
It is voltage U 3-2 that 3-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 3-2, after 3-3 bleeder circuit dividing potential drop, obtains voltage U 3-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 3-1 is constant; And voltage U 3-3 raises gradually, by the parameter designing to Q1 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage is low-pressure area, voltage U 3-3 is less than voltage U 3-1; When the 1st road input power Vccin1 voltage be middle nip or higher-pressure region time, voltage U 3-3 is greater than voltage U 3-1;
Q2 state control circuit comprises:
4-1 mu balanced circuit, 4-2 mu balanced circuit, 4-3 bleeder circuit and 4B comparator circuit U4B;
4-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4B comparator circuit U4B; For being voltage U 4-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of 4-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 4-3 bleeder circuit, is connected to the negative pole end of 4B comparator circuit U4B;
It is voltage U 4-2 that 4-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 4-2, after 4-3 bleeder circuit dividing potential drop, obtains voltage U 4-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 4-1 is constant; And voltage U 4-3 raises gradually, by the parameter designing to Q2 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage be low-pressure area and middle nip time, voltage U 4-3 is less than voltage U 4-1; When the 1st road input power Vccin1 voltage is higher-pressure region, voltage U 4-3 is greater than voltage U 4-1.
Widely when inputting with active node press that to adapt to DI circuit identical, for the circuit that this example provides, comprise self-powered and power supply protection circuit equally; Self-powered and power supply protection circuit are used for: by the voltage stabilization of the 1st road input power Vccin1 a definite value, and power to the electricity consumption device of Q1 state control circuit.
For signal conditioning circuit, in FIG, signal condition method is: access input power by K1, and after insurance F1 and diode D11, the π type filtering circuit through C3, L1, C4 composition carries out filtering, is generated as the VCC that other circuit of board are powered.Wherein D12, R18 are the anti-overvoltage resistance capaciting absorpting circuit being connected on L1 inductance two ends.
It is emphasized that, although invention describes the circuit structure that Fig. 1 and Fig. 2 two kinds is concrete, but, Fig. 1 and Fig. 2 has identical common ground, that is: all have employed comparator circuit, and, the voltage stabilizing reference circuit that one end series connection of comparator circuit is directly connected with external input power, the mu balanced circuit that the other end is connected and external input power is directly connected of comparator circuit and bleeder circuit, therefore, by to voltage stabilizing reference circuit, the design of mu balanced circuit and bleeder circuit, ensure according to the actual requirements, make comparator circuit under specific occasion, export high level or low-voltage, thus the control realized follow-up interlock circuit, and finally achieve the input of direct current Width funtion.Therefore, Fig. 1 and Fig. 2 has unicity.
To sum up, voltage adaptive Multipath digital quantity input card provided by the invention has the following advantages: the digital quantity input occasion being applied in insulation request, can while increasing input circuit complicacy and cost hardly, realize the board self-adaptation of wide pressure input, and, also there is the reliable advantage of circuit stability, can extensively should in the control system having the requirement of digital quantity Isolation input.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.
Claims (10)
1. a voltage adaptive Multipath digital quantity input card, it is characterized in that, wide pressure adaptation DI circuit when being applied to active node input, comprising: the 1st Circuit tuning, the 2nd Circuit tuning, comparator circuit, protection and filtering circuit, buffer circuit and export indicating circuit;
Described 1st Circuit tuning is connected on the positive terminal of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 1st level;
Described 2nd Circuit tuning is connected on the negative pole end of digital-quantity input interface and comparator circuit; For digital quantity input voltage Vcc is adjusted to the 2nd level; Wherein, when significant figure amount inputs, described 2nd level perseverance is less than described 1st level;
Described comparator circuit is used for comparing the 1st level and whether is greater than the 2nd level; and when the 1st level is greater than the 2nd level; described comparator circuit exports high level; described high level, after described protection and filtering circuit and described buffer circuit process, drives described output indicating circuit to carry out signal prompt.
2. voltage adaptive Multipath digital quantity input card according to claim 1, is characterized in that, described 1st Circuit tuning comprises the 1st mu balanced circuit and bleeder circuit of series connection; Described 2nd Circuit tuning is voltage stabilizing reference circuit; In the ideal case, when significant figure amount inputs, for the digital quantity input signal of any range voltage, its level after described 1st mu balanced circuit and bleeder circuit process, perseverance is greater than the level of this digital quantity input signal after the process of described voltage stabilizing reference circuit.
3. voltage adaptive Multipath digital quantity input card according to claim 2, is characterized in that, described 1st mu balanced circuit is used for described digital quantity input signal to be stabilized in magnitude of voltage U1;
The voltage that described bleeder circuit is used for described 1st mu balanced circuit exports carries out dividing potential drop, obtains the magnitude of voltage that described comparator circuit can bear; Wherein, described bleeder circuit comprises the 5th divider resistance R5 and the 7th divider resistance R7; 5th divider resistance R5 is connected on the positive terminal of the 1st mu balanced circuit and comparator circuit; One end of 7th divider resistance R7 is connected on the circuit between the 5th divider resistance R5 and comparator circuit positive terminal, the other end ground connection of the 7th divider resistance R7;
Described voltage stabilizing reference circuit is used for described digital quantity input signal to be stabilized in magnitude of voltage U2;
Further, following relational expression need be met: U1*R7/ (R7+R5) > U2.
4. voltage adaptive Multipath digital quantity input card according to claim 1, is characterized in that, also comprise: self-powered and power supply protection circuit; The input end of described self-powered and power supply protection circuit is connected with described digital-quantity input interface; The output terminal of described self-powered and power supply protection circuit is connected with filtering circuit and described buffer circuit with described comparator circuit, described protection respectively.
5. voltage adaptive Multipath digital quantity input card according to claim 4, it is characterized in that, described self-powered and power supply protection circuit comprise: the 2nd mu balanced circuit, overvoltage crowbar D3 and filter capacitor C1;
Described 2nd mu balanced circuit is connected on digital-quantity input interface and is powered between device, for being powered the voltage that device can bear described in the signal source provided from described digital-quantity input interface being stabilized in; Described overvoltage crowbar D3 and described filter capacitor C1 is all in parallel with described 2nd mu balanced circuit.
6. a voltage adaptive Multipath digital quantity input card, it is characterized in that, be applied to the DI circuit that when passive bus inputs, two-way redundant power is powered, comprise: the 1st road input power Vccin1, the 2nd road input power Vccin2, double loop power supply input automatic switch-over circuit, signal conditioning circuit, the 3rd mu balanced circuit, passive number amount node S1, protection and filtering circuit, buffer circuit and export indicating circuit;
Described double loop power supply input automatic switch-over circuit, comprising: relay K 1 and relay feed circuit; Described double loop power supply input automatic switch-over circuit is used for: when the 1st road input power Vccin1 has electricity, 1st road input power Vccin1 powers to relay feed circuit, and, relay feed circuit are according to the magnitude of voltage of the 1st road input power Vccin1, self-adaptation goes out the operating voltage of relay K1, and power to relay K 1, relay K 1 and then adhesive, thus the 1st road input power Vccin1 conducting is linked into signal conditioning circuit;
And when when the 1st road input power Vccin1 power-off, the 2nd road input power Vccin2 has an electricity, 1st road input power Vccin1 power-off and cause the power-off of relay feed circuit, and then make relay K 1 power down, relay K 1 normally closed contact access the 2nd road input power Vccin2, thus make the 2nd road input power Vccin2 conducting and be linked into signal conditioning circuit;
By unified referred to as input power Vccink to the 1st road input power Vccin1 or the 2nd road input power Vccin2 that are linked into signal conditioning circuit; Input power Vccink, after signal conditioning circuit process, obtains input power Vcc;
The output terminal of input power Vcc is by the 3rd mu balanced circuit, be connected to one end of described passive number amount node S1, the other end of described passive number amount node S1 by after described protection and filtering circuit, described buffer circuit, is connected to described output indicating circuit successively;
When described passive number amount node S1 inputs pass information, input power Vcc is stabilized to a magnitude of voltage by the 3rd mu balanced circuit, and by after described protection and filtering circuit and described buffer circuit, drives described output indicating circuit to carry out signal prompt;
And when information is opened in described passive number amount node S1 input, input power Vcc and described protection and filtering circuit are off state, now, described output indicating circuit does not carry out signal prompt.
7. voltage adaptive Multipath digital quantity input card according to claim 6, it is characterized in that, when the 1st road input power Vccin1 has electricity, for double loop power supply input automatic switch-over circuit, in the following manner, the operating voltage magnitude of voltage self-adaptation of the 1st road input power Vccin1 being gone out relay K1 is realized:
1st power supply interface of relay K 1 is connected with the 1st road input power Vccin1, and the 2nd power supply interface of relay K 1 is connected in parallel ground connection after 3 power supply branch roads; Wherein, the 1st power supply branch road be the 1st power switch pipe Q1, the 2nd power supply branch road be the 20th divider resistance R20, the 3rd power supply branch road be series connection the 25th divider resistance R25 and the 2nd power switch pipe Q2; Further, the 20th divider resistance R20 is greater than the 25th divider resistance R25;
Described double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1.
8. voltage adaptive Multipath digital quantity input card according to claim 7, it is characterized in that, described double loop power supply input automatic switch-over circuit, according to the magnitude of voltage of the 1st road input power Vccin1, the on off state of the 1st power switch pipe Q1 and the 2nd power switch pipe Q2 is controlled, and then the magnitude of voltage self-adaptation of the 1st road input power Vccin1 is gone out the operating voltage of relay K1, be specially:
By the voltage range of the 1st road input power Vccin1, be divided into three intervals, from small to large ord, be designated as successively: low-pressure area, middle nip and higher-pressure region;
When the 1st road input power Vccin1 is low-pressure area, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is conducting state, now, to relay K 1 power the 1st road input power Vccin1 after relay K 1, by the direct ground connection of the 1st power switch pipe Q1, therefore, the 1st road input power Vccin1 powers directly to relay K 1; The supply voltage of relay K 1 equals the magnitude of voltage of the 1st road input power Vccin1;
When the 1st road input power Vccin1 is middle nip, controlling the 1st power switch pipe Q1 is off state, controlling the 2nd power switch pipe Q2 is conducting state, now, to the 1st road input power Vccin1 ground connection after the 20th divider resistance R20 and the 25th divider resistance R25 dividing potential drop of parallel connection that relay K 1 is powered; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20 in parallel and the 25th divider resistance R25, the voltage obtained is to relay K 1 supply voltage;
When the 1st road input power Vccin1 is higher-pressure region, control the 2nd power switch pipe Q2 and the 1st power switch pipe Q1 is off state, now, the 1st road input power Vccin1 powered to relay K 1 is after relay K 1, again by after the 20th divider resistance R20, just ground connection; Therefore, the voltage of the 1st road input power Vccin1, after deducting the dividing potential drop of the 20th divider resistance R20, the voltage obtained is to relay K 1 supply voltage.
9. voltage adaptive Multipath digital quantity input card according to claim 8, is characterized in that, described double loop power supply input automatic switch-over circuit, comprises Q1 state control circuit and Q2 state control circuit;
Described Q1 state control circuit comprises:
3-1 mu balanced circuit, 3-2 mu balanced circuit, 3-3 bleeder circuit and 4A comparator circuit U4A;
Described 3-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4A comparator circuit U4A; For being voltage U 3-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of described 3-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 3-3 bleeder circuit, is connected to the negative pole end of 4A comparator circuit U4A;
It is voltage U 3-2 that described 3-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 3-2, after 3-3 bleeder circuit dividing potential drop, obtains voltage U 3-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 3-1 is constant; And voltage U 3-3 raises gradually, by the parameter designing to Q1 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage is low-pressure area, voltage U 3-3 is less than voltage U 3-1; When the 1st road input power Vccin1 voltage be middle nip or higher-pressure region time, voltage U 3-3 is greater than voltage U 3-1;
Described Q2 state control circuit comprises:
4-1 mu balanced circuit, 4-2 mu balanced circuit, 4-3 bleeder circuit and 4B comparator circuit U4B;
Described 4-1 mu balanced circuit is connected on the positive terminal of the 1st road input power Vccin1 interface and 4B comparator circuit U4B; For being voltage U 4-1 by the 1st road input power Vccin1 voltage stabilization;
The input end of described 4-2 mu balanced circuit is connected with the 1st road input power Vccin1 interface, and output terminal, by after 4-3 bleeder circuit, is connected to the negative pole end of 4B comparator circuit U4B;
It is voltage U 4-2 that described 4-2 mu balanced circuit is used for the 1st road input power Vccin1 voltage stabilization, and voltage U 4-2, after 4-3 bleeder circuit dividing potential drop, obtains voltage U 4-3;
Wherein, rise to the process of higher-pressure region at the 1st road input power Vccin1 voltage from low-pressure area, voltage U 4-1 is constant; And voltage U 4-3 raises gradually, by the parameter designing to Q2 state control circuit, need meet the following conditions:
When the 1st road input power Vccin1 voltage be low-pressure area and middle nip time, voltage U 4-3 is less than voltage U 4-1; When the 1st road input power Vccin1 voltage is higher-pressure region, voltage U 4-3 is greater than voltage U 4-1.
10. voltage adaptive Multipath digital quantity input card according to claim 9, is characterized in that, also comprise: described Q1 state control circuit also comprises: self-powered and power supply protection circuit; Described self-powered and power supply protection circuit are used for: by the voltage stabilization of the 1st road input power Vccin1 a definite value, and power to the electricity consumption device of Q1 state control circuit.
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| CN104820457B (en) | 2016-02-24 |
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Inventor after: Chen Mingjie Inventor after: Ren Chenglin Inventor after: Guan Lei Inventor after: Zhang Lei Inventor after: Hu Weiping Inventor after: Zhang Haitao Inventor before: Chen Mingjie Inventor before: Ren Chenglin Inventor before: Zhang Lei Inventor before: Hu Weiping Inventor before: Zhang Haitao |