CN105527838A - PID automatic control system - Google Patents
PID automatic control system Download PDFInfo
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- CN105527838A CN105527838A CN201610031964.1A CN201610031964A CN105527838A CN 105527838 A CN105527838 A CN 105527838A CN 201610031964 A CN201610031964 A CN 201610031964A CN 105527838 A CN105527838 A CN 105527838A
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- circuit
- voltage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The invention relates to a PID automatic control system, which comprises a first current-to-voltage conversion circuit for converting a current signal of a sensor into a voltage signal; a second current-to-voltage conversion circuit for converting an expected current signal into a voltage signal; an error calculation circuit for carrying out error calculation on the output values of the first current-to-voltage conversion circuit and the second current-to-voltage conversion circuit; a PID operation circuit for carrying out operation on the error voltage signal output by the error calculation circuit; a voltage-to-current conversion circuit for converting the voltage signal output by the PID operation circuit into current signal; and a power supply circuit. The PID automatic control system not only can receive current signal and output current control signal, but also can enable the received current signal to reach the expected current signal after operation, and thus use range is wide.
Description
Technical field
The present invention relates to a kind of PID automatic control system.
Background technology
Existing PID automatic control system, it can only receive, process voltage signal, and the final control signal exported also is voltage signal, cannot process current signal, can not output current signal; And existing PID control system, its sensor current signal that can not will receive, reaches the current signal of expection, thus makes its usable range narrow after computing exports.
Summary of the invention
Object of the present invention: in order to overcome the defect of prior art, the invention provides a kind of PID automatic control system, it can not only received current signal, output current control signal, and the current signal of reception can also be reached after computing the current signal of expection, usable range is wide.
Technical scheme of the present invention: a kind of PID automatic control system, it is characterized in that: include the first electric current changing voltage circuit for the current signal of sensor being converted to voltage signal, for the current signal of expection being converted to the second electric current changing voltage circuit of voltage signal, for by the first electric current changing voltage circuit, the output valve of the second electric current changing voltage circuit carries out the error calculation circuit of error calculation, error voltage signal for being exported by error calculation circuit carries out ratio, integration, the PID arithmetic circuit of differentiating, voltage signal for being exported by PID arithmetic circuit converts the voltage transitions current circuit of prospective current signal to, for giving the first electric current changing voltage circuit, second electric current changing voltage circuit, error calculation circuit, PID arithmetic circuit, the power supply circuit that voltage transitions current circuit is powered.
Adopt technique scheme, the first electric current changing voltage circuit of setting, the second electric current changing voltage circuit, can received current signal, the voltage transitions current circuit of setting, can output current signal; And this PID automatic control system, the current signal of sensor can be controlled in the current signal value of expection, usable range is wide.
The further setting of the present invention: described PID arithmetic circuit includes the reverse ratio circuit, reverse integral circuit, the reverse differentiating circuit that are arranged in parallel, also includes for reverse ratio circuit, reverse integral circuit, the oppositely output signal value of differentiating circuit are carried out the reverse summing circuit of superposition.
Adopt above-mentioned further setting, this PID arithmetic circuit, operational precision is high, and accuracy rate is high, dependable performance.
Setting further more of the present invention: described power supply circuit includes the first power supply circuit for powering to the first electric current changing voltage circuit, the second electric current changing voltage circuit, oppositely summing circuit, voltage transitions current circuit, for the second power supply circuit powering to error calculation circuit, oppositely ratio circuit, reverse integral circuit, reverse differentiating circuit.
Adopt and above-mentionedly to arrange further again, make it to the power supply better effects if of each circuit, the operational precision of whole system is higher, more stable.
Accompanying drawing explanation
Fig. 1 is the principle of work block diagram of the specific embodiment of the invention;
Fig. 2 is the first electric current changing voltage circuit diagram in the specific embodiment of the invention;
Fig. 3 is the second electric current changing voltage circuit diagram in the specific embodiment of the invention;
Fig. 4 is specific embodiment of the invention medial error counting circuit figure;
Fig. 5 is PID arithmetic circuit diagram in the specific embodiment of the invention;
Fig. 6 is voltage transitions current circuit figure in the specific embodiment of the invention;
Fig. 7 is the first power supply circuit figure in the specific embodiment of the invention;
Fig. 8 is the second power supply circuit figure in the specific embodiment of the invention.
Embodiment
As shown in figures 1-8, a kind of PID automatic control system, include the first electric current changing voltage circuit for the current signal of sensor being converted to voltage signal, for the current signal of expection being converted to the second electric current changing voltage circuit of voltage signal, for by the first electric current changing voltage circuit, the output valve of the second electric current changing voltage circuit carries out the error calculation circuit of error calculation, error voltage signal for being exported by error calculation circuit carries out ratio, integration, the PID arithmetic circuit of differentiating, voltage signal for being exported by PID arithmetic circuit converts the voltage transitions current circuit of prospective current signal to, for giving the first electric current changing voltage circuit, second electric current changing voltage circuit, error calculation circuit, PID arithmetic circuit, the power supply circuit that voltage transitions current circuit is powered.As shown in Figure 5, wherein, described PID arithmetic circuit includes the reverse ratio circuit 1 be arranged in parallel, reverse integral circuit 2, reverse differentiating circuit 3, also include for by reverse ratio circuit 1, reverse integral circuit 2, the output signal value of reverse differentiating circuit 3 carries out the reverse summing circuit 4 of summation operation, described power supply circuit include for give the first electric current changing voltage circuit, second electric current changing voltage circuit, reverse summing circuit, the first power supply circuit that voltage transitions current circuit is powered, for giving error calculation circuit, reverse ratio circuit, reverse integral circuit, the second power supply circuit that reverse differentiating circuit is powered.
As shown in Figure 2,3, R6 in circuit is current sampling resistor, convert various sensor output current signal to voltage signal, voltage signal carries out amplifying to improve its load capacity by integrated circuit (IC) chip U3, make next stage circuit farthest can obtain voltage signal from the voltage output signal OUT1 of this chip, electric capacity C2 plays the filter action to chip U3, and R23 and the R6 in Fig. 3, U5 and U3, C8 and C2 effect is identical.
As shown in Figure 4, R12, R15, R4, R21 in circuit form a subtraction circuit together with chip U1C, and electric capacity C6, C9 play the power supply ripple filter action to chip.
As shown in Figure 5, resistance Rp1, R2, R1 and integrated circuit (IC) chip U1A form reverse scaling circuit, realize the reverse scale amplifying computing to OUT3 error voltage signal, and Rp1 are adjustable resistance, thus make reverse scale amplifying adjustable magnification; Resistance RP2, R13 electric capacity C5 and integrated circuit (IC) chip U1B forms reverse integral computing circuit, and the saturated effect of anti-windup is played in the effect of resistance R5, and RP2 is adjustable resistance, makes reverse integral coefficient adjustable; Electric capacity C12 resistance R26, RP3, R24 and integrated circuit (IC) chip U1D forms reverse differential operation circuit, and electric capacity C10 plays the effect of stable differentiating circuit, and RP3 is adjustable resistance, makes reverse differential coefficient adjustable; Last resistance R3, R16, R27, R7 and integrated circuit (IC) chip U4 composition, reverse summing circuit, by reverse ratio circuit, reverse integral circuit, oppositely differentiating circuit again revert all stack up, finally export the voltage output signal OUT4 after computing, wherein electric capacity C3 plays the low-pass filtering effect to voltage signal, and C7 plays power supply ripple filter action.
As shown in Figure 6, resistance R8, R14, R18, R22, R19, R20, RP4, R10, R9, R11, R17, R25, dual-polar triode Q1, field effect transistor Q2, integrated circuit (IC) chip U2 form Voltage-current conversion circuit together, final output control signal exports from OUT5, and electric capacity C4, C1, C11 wherein all play power supply ripple filter action.
As shown in Figure 7,8, first alternating voltage inputs from power connector J1, then after the current rectifying and wave filtering circuit of diode D1, D2, D3, D4, electric capacity C15, C21, C18, C22, voltage stabilizing chip U6, voltage stabilizing chip U8 composition, obtain positive and negative 24V direct supply, electric capacity C13, C16, C19, C23 play the power supply ripple filter action to positive and negative 24V.Positive and negative 24V power supply obtains positive and negative 5V direct supply after voltage stabilizing chip U7, U9, and electric capacity C14, C17, C20, C24 play the power supply ripple filter action to positive and negative 5V.Positive and negative 24V power supply obtains adjustable voltage again after the adjustable mu balanced circuit that resistance RP5, R32, R33, R34, RP6, R35 and voltage stabilizing chip U10, U11 form, this voltage range is that between positive 4.8V ~ 5.8V to negative 4.8V ~ 5.8V, electric capacity C25, C26 play power supply ripple filter action to positive and negative adjustable voltage.
Claims (3)
1. a PID automatic control system, it is characterized in that: include the first electric current changing voltage circuit for the current signal of sensor being converted to voltage signal, for the current signal of expection being converted to the second electric current changing voltage circuit of voltage signal, for by the first electric current changing voltage circuit, the output valve of the second electric current changing voltage circuit carries out the error calculation circuit of error calculation, error voltage signal for being exported by error calculation circuit carries out ratio, integration, the PID arithmetic circuit of differentiating, voltage signal for being exported by PID arithmetic circuit converts the voltage transitions current circuit of prospective current signal to, for giving the first electric current changing voltage circuit, second electric current changing voltage circuit, error calculation circuit, PID arithmetic circuit, the power supply circuit that voltage transitions current circuit is powered.
2. PID automatic control system according to claim 1, it is characterized in that: described PID arithmetic circuit includes the reverse ratio circuit, reverse integral circuit, the reverse differentiating circuit that are arranged in parallel, also include for reverse ratio circuit, reverse integral circuit, the oppositely output signal value of differentiating circuit are carried out the reverse summing circuit of summation operation.
3. PID automatic control system according to claim 2, it is characterized in that: described power supply circuit includes the first power supply circuit for powering to the first electric current changing voltage circuit, the second electric current changing voltage circuit, oppositely summing circuit, voltage transitions current circuit, for the second power supply circuit giving error calculation circuit, oppositely ratio circuit, reverse integral circuit, oppositely differentiating circuit are powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031964.1A CN105527838A (en) | 2016-01-18 | 2016-01-18 | PID automatic control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610031964.1A CN105527838A (en) | 2016-01-18 | 2016-01-18 | PID automatic control system |
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| CN105527838A true CN105527838A (en) | 2016-04-27 |
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| CN201610031964.1A Pending CN105527838A (en) | 2016-01-18 | 2016-01-18 | PID automatic control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678926A (en) * | 2017-01-23 | 2017-05-17 | 惠安县昌瑞五金制品有限公司 | Community heating system based on BIM technology |
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| CN106678926A (en) * | 2017-01-23 | 2017-05-17 | 惠安县昌瑞五金制品有限公司 | Community heating system based on BIM technology |
| CN106678926B (en) * | 2017-01-23 | 2019-02-26 | 南京兰林智慧建筑科技有限公司 | A kind of cell heating system based on BIM technology |
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Application publication date: 20160427 |