CN203825065U - Circuit used for amplifying input signal of intelligent controller - Google Patents
Circuit used for amplifying input signal of intelligent controller Download PDFInfo
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- CN203825065U CN203825065U CN201420232545.0U CN201420232545U CN203825065U CN 203825065 U CN203825065 U CN 203825065U CN 201420232545 U CN201420232545 U CN 201420232545U CN 203825065 U CN203825065 U CN 203825065U
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Abstract
The utility model provides a circuit used for amplifying input signals of an intelligent controller, and the circuit belongs to the technical field of low voltage electrical appliances. The circuit comprises an integral circuit, a proportional amplifying circuit and a microprocessor, wherein the proportional amplifying circuit comprises an operational amplifier, an analog switch, a first resistor, a second resistor and a three resistor, one end of the first resistor is connected with one end of the second resistor, the other end of the second resistor and one end of the third resistor are connected with an input end of the operational amplifier, another input end of the operational amplifier is connected with an output end of the integral circuit, an output end of the operational amplifier is connected with the other end of the first resistor and is connected with an A/D input port of the microprocessor, a control end of the analog switch is connected with an output end of the microprocessor, an input end of the analog switch is connected with one end of the first resistor and one end of the second resistor, another input end is connected with the other end of the first resistor and the other end of the second resistor, and another end of the third resistor is grounded. The circuit used for amplifying the input signals of the intelligent controller reduces the number of the operational amplifiers in use, saves resources of the A/D input port, is simple in adjusting amplification factors, and is low in cost.
Description
Technical field
The utility model belongs to low voltage electrical apparatus technology field, is specifically related to a kind ofly for amplifying the circuit of intelligent controller input signal, relates in particular to a kind of enlargement factor optionally for amplifying the circuit of intelligent controller input signal.
Background technology
Intelligent controller for circuit breakers, also referred to as overcurrent trip, is the core component of intelligent breaker, and its major function is the current signal in detection of grid, controls tripping mechanism the phenomena of the failure such as overload, short circuit are protected after logic analysis judgement.At present, the input signal of intelligent controller, generally from Rogowski (abbreviation Roche) air core coil, therefore all will first carry out Integral Processing to this signal, then sends into A/D converter after amplifying, and calculates thus the size of measuring electric current.Along with the high speed development of China's power industry, more and more higher to the requirement of low voltage electrical apparatus technology index, defencive function when intelligent controller for circuit breakers not only will meet large electric current also requires certain measuring accuracy when little electric current.For this reason, when signal is amplified, large electric current and input signal corresponding to little electric current will be processed with different amplification coefficients.Due to the amplification of signal after integration is realized by operational amplifier, therefore in order to realize two kinds of different amplification coefficients, a kind of existing scheme is that a plurality of operational amplifiers with different amplification coefficients are connected in parallel at input end, output terminal is connected to respectively different A/D input ports, according to the difference of input current potential, through microprocessor etc. judge selection wherein a road signal calculate; Another kind of existing scheme is that a plurality of operational amplifiers are connected in series, and output terminal connects respectively different A/D input ports, equally according to the difference of input current potential, by microprocessor etc. judge selection wherein a road signal calculate.The common defect existing of this two schemes is that operational amplifier quantity is more, and needs a plurality of A/D input port to support, thereby use cost is higher.Also having at present a kind of scheme is that resistance is connected with a switch, jointly be parallel to again the two ends of integrating capacitor, the signal that integration obtains is after operational amplifier amplifies, by microprocessor, control described switch and obtain different amplification coefficients, utilize two kinds of signals that different coefficient magnifies obtain in this scheme, its phase place also can be different, and this can increase the difficulty of subsequent calculations.
In view of above-mentioned prior art, be necessary to be improved, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
Task of the present utility model is to provide that a kind of simplicity of design is reasonable, with low cost, easy realization for amplifying the circuit of intelligent controller input signal.
In order to complete described task, technical scheme provided by the utility model is: a kind of for amplifying the circuit of intelligent controller input signal, comprise an integrating circuit, ratio amplifying circuit and a microprocessor (MCU), the input end of integrating circuit receives the current signal that needs detection, the output terminal of integrating circuit connects ratio amplifying circuit, ratio amplifying circuit is connected with microprocessor, it is characterized in that: described ratio amplifying circuit comprises operational amplifier, analog switch, the first resistance, the second resistance and the 3rd resistance, one end of the first resistance is connected with one end of the second resistance, the other end of the second resistance is connected with one end of the 3rd resistance and an input end of operational amplifier, another input end of operational amplifier connects the output terminal of integrating circuit as an input end of ratio amplifying circuit, the output terminal of operational amplifier is connected with the other end of the first resistance, and as the output terminal of ratio amplifying circuit, connect the A/D input port of microprocessor, the control end of analog switch is connected with the output terminal of microprocessor as another input end of ratio amplifying circuit, one input end of analog switch is connected with one end of one end of the first resistance and the second resistance, another input end of analog switch is connected with the other end of the other end of the first resistance or the second resistance, the other end ground connection of the 3rd resistance.
In order to complete described task, technical scheme provided by the utility model is: a kind of for amplifying the circuit of intelligent controller input signal, comprise an integrating circuit, a ratio amplifying circuit and a microprocessor, the input end of integrating circuit receives the current signal that needs detection, the output terminal of integrating circuit connects ratio amplifying circuit, ratio amplifying circuit is connected with microprocessor, it is characterized in that: described ratio amplifying circuit comprises operational amplifier, analog switch, the first resistance, the second resistance and the 3rd resistance, one end of the first resistance is connected with one end of the second resistance, the other end of the second resistance is connected with one end of the 3rd resistance and an input end of operational amplifier, the 3rd other end of resistance and the output terminal of operational amplifier are connected, and as the output terminal of ratio amplifying circuit, connect the A/D input port of microprocessor, another input end of operational amplifier connects the output terminal of integrating circuit as an input end of ratio amplifying circuit, the control end of analog switch is connected with the output terminal of microprocessor as another input end of ratio amplifying circuit, one input end of analog switch is connected with one end of one end of the first resistance and the second resistance, another input end of analog switch is connected with the other end of the other end of the first resistance or the second resistance, the other end ground connection of the first resistance.
The utility model is owing to having adopted said structure, and compared with prior art, the beneficial effect having is: can reduce the usage quantity of operational amplifier, save A/D input port resource, amplification coefficient regulates simple, is easy to realize, and cost is lower.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of an embodiment of the present utility model.
Fig. 2 is the electrical schematic diagram of another embodiment of the present utility model.
Embodiment
Applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, anyly according to the utility model design, changes in the form rather than substance all and should be considered as protection domain of the present utility model.
Embodiment 1:
Refer to Fig. 1, it is example that the utility model be take intelligent controller one road input signal.A kind of for amplifying the circuit of intelligent controller input signal, comprise an integrating circuit 1, ratio amplifying circuit 2 and a microprocessor 3, in this embodiment, adopt Rogowski air core coil 10 to gather the current signal in electrical network as current sensor.The input end of integrating circuit 1 connects Rogowski air core coil 10, and for receiving the current signal that needs detection, the output terminal of integrating circuit 1 connects ratio amplifying circuit 2, and ratio amplifying circuit 2 is connected with microprocessor 3.
Described integrating circuit 1 is RC integrating circuit, comprise the 4th resistance R and capacitor C, one end of the 4th resistance R connects Rogowski air core coil 10, the 4th other end of resistance R and one end of capacitor C are connected, an input end that connects ratio amplifying circuit 2 as the output terminal of integrating circuit 1, the other end ground connection of capacitor C.Described ratio amplifying circuit 2 comprises operational amplifier 4, analog switch 5, the first resistance 6, the second resistance 7 and the 3rd resistance 8.One end of the first resistance 6 is connected with one end of the second resistance 7, the other end of the second resistance 7 is connected with one end of the 3rd resistance 8 and an input end of operational amplifier 4, another input end of operational amplifier 4 connects the output terminal of integrating circuit 1 as an input end of ratio amplifying circuit 2, the output terminal of operational amplifier 4 is connected with the other end of the first resistance 6, and as the output terminal of ratio amplifying circuit 2, connect the A/D input port 9 of microprocessor 3, the control end of analog switch 5 is connected with the output terminal of microprocessor 3 as another input end of ratio amplifying circuit 2, one input end of analog switch 5 is connected with one end of one end of the first resistance 6 and the second resistance 7, another input end of analog switch 5 is connected with the other end of the other end of the first resistance 6 or the second resistance 7, the other end ground connection of the 3rd resistance 8.In the present embodiment, another input end of analog switch 5 is connected with the other end of the first resistance 6, and the output terminal of another input end of analog switch 5 and the other end of the first resistance 6 and operational amplifier 4 is connected to the A/D input port 9 of microprocessor 3 jointly.Wherein, when one end of an input end of analog switch 5 and one end of the first resistance 6 and the second resistance 7 is connected, when another input end of analog switch 5 is connected with the other end of the first resistance 6, now the second resistance 7 can be zero resistance.When one end of an input end of analog switch 5 and one end of the first resistance 6 and the second resistance 7 is connected, when another input end of analog switch 5 is connected with the other end of the second resistance 7, now the first resistance 6 can be zero resistance.
Referring again to Fig. 1, the principle of work of the present embodiment is explained.Rogowski air core coil 10 is sent to ratio amplifying circuit 2 from the current signal of electrical network collection after integrating circuit 1 integration, and integrating circuit 1 is RC integrating circuit, and suitable R, signal and the power network current same-phase of C parameter to guarantee to record are set.In order to make current signal meet the input requirements of the A/D conversion mouth 9 of microprocessor 3; guarantee measuring accuracy and defencive function within the scope of relatively large journey simultaneously, the signal after RC integration need to be delivered to ratio amplifying circuit 2 and process to realize the amplification of two kinds of different amplification coefficients.The disconnection of microprocessor 3 by the analog switch 5 in control ratio amplifying circuit 2 with connect the amplification coefficient that changes ratio amplifying circuit 2.The first resistance 6, the second resistance 7 and the 3rd resistance 8 are for regulating amplification coefficient resistance, the resistance of supposing the first resistance 6, the second resistance 7 and the 3rd resistance 8 is respectively R6, R7, R8, the amplification coefficient of ratio amplifying circuit 2 is K, when microprocessor 3 control simulation switches 5 disconnect, according to amplification coefficient formula
obtain large amplification coefficient K, the measurement while being applicable to little electric current; When microprocessor 3 control simulation switches 5 are connected, because the first resistance R 6 simulated switch 5 short circuits, according to amplification coefficient formula
obtain little amplification coefficient K, the measurement while being applicable to large electric current.Microprocessor 3 disconnection capable of circulation and connection analog switch 5, gather the signal under two kinds of different amplification coefficients, according to the size of collected signal, judges and select one of them signal data to calculate.When the signal gathering under large amplification coefficient is less than certain value of setting, just with the signal data gathering under large amplification coefficient, calculates, otherwise adopt the signal gathering under little amplification coefficient to calculate.In the present embodiment, operational amplifier 4 and microprocessor 3 are existing products in markets, wherein, microprocessor 3 control simulation switches 5 cut-off operation, the operation from A/D conversion mouthful 9 picked up signal is prior art, repeat no more herein.
Embodiment 2:
Refer to Fig. 2, it is example that the utility model be take intelligent controller one road input signal, and described ratio amplifying circuit 2 comprises operational amplifier 4, analog switch 5, the first resistance 6, the second resistance 7 and the 3rd resistance 8.One end of the first resistance 6 is connected with one end of the second resistance 7, the other end of the second resistance 7 is connected with one end of the 3rd resistance 8 and an input end of operational amplifier 4, the other end of the 3rd resistance 8 is connected with the output terminal of operational amplifier 4, and as the output terminal of ratio amplifying circuit 2, connect the A/D input port 9 of microprocessor 3, another input end of operational amplifier 4 connects the output terminal of integrating circuit 1 as an input end of ratio amplifying circuit 2, the control end of analog switch 5 is connected with the output terminal of microprocessor 3 as another input end of ratio amplifying circuit 2, one input end of analog switch 5 is connected with one end of one end of the first resistance 6 and the second resistance 7, another input end of analog switch 5 is connected with the other end of the other end of the first resistance 6 or the second resistance 7, the other end ground connection of the first resistance 6.In the present embodiment, another input end of analog switch 5 is connected with the other end of the first resistance 6, i.e. the other end common ground of another input end of analog switch 5 and the first resistance 6.All the other are all with the description of embodiment 1.
Referring again to Fig. 2, the principle of work of the present embodiment is explained.Rogowski air core coil 10 is sent to ratio amplifying circuit 2 from the current signal of electrical network collection after integrating circuit 1 integration, and integrating circuit 1 is RC integrating circuit, and suitable R, signal and the power network current same-phase of C parameter to guarantee to record are set.In order to make current signal meet the input requirements of the A/D conversion mouth 9 of microprocessor 3; guarantee measuring accuracy and defencive function within the scope of relatively large journey simultaneously, the signal after RC integration is delivered to ratio amplifying circuit 2 and to realize the amplification of two kinds of different amplification coefficients, process.The disconnection of microprocessor 3 by the analog switch 5 in control ratio amplifying circuit 2 with connect the amplification coefficient that changes ratio amplifying circuit 2.With embodiment 1, the first resistance 6, the second resistance 7 and the 3rd resistance 8 are for regulating amplification coefficient resistance, the resistance of supposing the first resistance 6, the second resistance 7 and the 3rd resistance 8 is respectively R6, R7, R8, the amplification coefficient of ratio amplifying circuit 2 is K, when microprocessor 3 control simulation switches 5 disconnect, according to amplification coefficient formula
obtain little amplification coefficient K, the measurement while being applicable to large electric current; When microprocessor 3 control simulation switches 5 are connected, because resistance R 6 simulated switch 5 short circuits, according to amplification coefficient formula
obtain large amplification coefficient K, the measurement while being applicable to little electric current.Microprocessor 3 disconnection capable of circulation and connection analog switch 5, gather the signal under two kinds of different amplification coefficients, according to the size of collected signal, judges and select one of them signal data to calculate.When the signal gathering under large amplification coefficient is less than certain value of setting, just with the signal data gathering under large amplification coefficient, calculates, otherwise adopt the signal gathering under little amplification coefficient to calculate.In the present embodiment, operational amplifier 4 and microprocessor 3 are existing products in markets, wherein, microprocessor 3 control simulation switches 5 cut-off operation, the calculating from A/D conversion mouthful 9 picked up signal is prior art, repeat no more herein.
Claims (2)
1.
a kind of for amplifying the circuit of intelligent controller input signal, comprise an integrating circuit (1), a ratio amplifying circuit (2) and a microprocessor (3), the input end of integrating circuit (1) receives the current signal that needs detection, the output terminal of integrating circuit (1) connects ratio amplifying circuit (2), ratio amplifying circuit (2) is connected with microprocessor (3), it is characterized in that: described ratio amplifying circuit (2) comprises operational amplifier (4), analog switch (5), the first resistance (6), the second resistance (7) and the 3rd resistance (8), one end of the first resistance (6) is connected with one end of the second resistance (7), the other end of the second resistance (7) is connected with one end of the 3rd resistance (8) and an input end of operational amplifier (4), another input end of operational amplifier (4) connects the output terminal of integrating circuit (1) as an input end of ratio amplifying circuit (2), the output terminal of operational amplifier (4) is connected with the other end of the first resistance (6), and as the output terminal of ratio amplifying circuit (2), connect the A/D input port (9) of microprocessor (3), the control end of analog switch (5) is connected with the output terminal of microprocessor (3) as another input end of ratio amplifying circuit (2), one input end of analog switch (5) is connected with one end of the first resistance (6) and one end of the second resistance (7), another input end of analog switch (5) is connected with the other end of the first resistance (6) or the other end of the second resistance (7), the other end ground connection of the 3rd resistance (8).
2.
a kind of for amplifying the circuit of intelligent controller input signal, comprise an integrating circuit (1), a ratio amplifying circuit (2) and a microprocessor (3), the input end of integrating circuit (1) receives the current signal that needs detection, the output terminal of integrating circuit (1) connects ratio amplifying circuit (2), ratio amplifying circuit (2) is connected with microprocessor (3), it is characterized in that: described ratio amplifying circuit (2) comprises operational amplifier (4), analog switch (5), the first resistance (6), the second resistance (7) and the 3rd resistance (8), one end of the first resistance (6) is connected with one end of the second resistance (7), the other end of the second resistance (7) is connected with one end of the 3rd resistance (8) and an input end of operational amplifier (4), the other end of the 3rd resistance (8) is connected with the output terminal of operational amplifier (4), and as the output terminal of ratio amplifying circuit (2), connect the A/D input port (9) of microprocessor (3), another input end of operational amplifier (4) connects the output terminal of integrating circuit (1) as an input end of ratio amplifying circuit (2), the control end of analog switch (5) is connected with the output terminal of microprocessor (3) as another input end of ratio amplifying circuit (2), one input end of analog switch (5) is connected with one end of the first resistance (6) and one end of the second resistance (7), another input end of analog switch (5) is connected with the other end of the first resistance (6) or the other end of the second resistance (7), the other end ground connection of the first resistance (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420232545.0U CN203825065U (en) | 2014-05-08 | 2014-05-08 | Circuit used for amplifying input signal of intelligent controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420232545.0U CN203825065U (en) | 2014-05-08 | 2014-05-08 | Circuit used for amplifying input signal of intelligent controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305594A (en) * | 2015-11-18 | 2016-02-03 | 深圳供电局有限公司 | Circuit used for acquiring bus current and station electricity emergency automatic switching device |
| CN109164287A (en) * | 2018-10-08 | 2019-01-08 | 深圳市艾华迪技术有限公司 | A kind of hollow coil AC current sensor |
-
2014
- 2014-05-08 CN CN201420232545.0U patent/CN203825065U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305594A (en) * | 2015-11-18 | 2016-02-03 | 深圳供电局有限公司 | Circuit used for acquiring bus current and station electricity emergency automatic switching device |
| CN109164287A (en) * | 2018-10-08 | 2019-01-08 | 深圳市艾华迪技术有限公司 | A kind of hollow coil AC current sensor |
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