CN204652047U - Signal integration circuit and circuit breaker intelligent controller - Google Patents
Signal integration circuit and circuit breaker intelligent controller Download PDFInfo
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- CN204652047U CN204652047U CN201520074358.9U CN201520074358U CN204652047U CN 204652047 U CN204652047 U CN 204652047U CN 201520074358 U CN201520074358 U CN 201520074358U CN 204652047 U CN204652047 U CN 204652047U
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Abstract
Signal integration circuit and circuit breaker intelligent controller, signal integration circuit comprises the first operational amplifier, the inverting input of the first operational amplifier and normal phase input end are connected with the first input end of signal integration circuit and the second input respectively, and the output of the first operational amplifier is connected with the first output of signal integration circuit; Also comprise low pass filter, the amplitude limiter circuit of the maximum output swing of restricting signal integrating circuit and DC component circuit; Be provided with low pass filter at first input end with between the second input and the first operational amplifier, be provided with DC component circuit at first input end with between the second input and low pass filter, amplitude limiter circuit is connected with the first operation amplifier circuit; The normal phase input end of the reference voltage that DC component circuit also outputs signal with lifting and the first operational amplifier is connected.The utility model provides a kind of structure simple, highly sensitive, signal integration circuit and the circuit breaker intelligent controller comprising this signal integration circuit of stable performance.
Description
Technical field
The utility model relates to Low Voltage Electrical Apparatus, particularly a kind of signal integration circuit and circuit breaker intelligent controller.
Background technology
Generally apply air core coil (Rogowski) as current sensor now, because it is without magnetic saturation phenomenon, measuring range is wide, and bandwidth is high and volume is little, and insulation is simple, with low cost, is applied to the aspect such as Survey control and metering protection more and more widely.Utilize air core coil measure electric current time coil around the conductor being loaded with tested electric current, when tested electric current changes, coil two ends induce voltage signal, there is following relation between tested electric current and air core coil induced voltage:
M is the coefficient of mutual inductance between air core coil and current－carrying conductor, this shows air core coil induced voltage and tested electric current components in time.Therefore, when applying air core coil as current sensor, integration must be carried out to air core coil induced voltage and just can draw the voltage signal linear with tested electric current.
In order to realize the integration of signal, a kind of low pass filter of general use realizes, the simplest implementation is: the combination (RC low pass filter) of a resistance and electric capacity, generically be called passive integrator, because of this integrating circuit, to there is error large, the shortcomings such as sensitivity is low, really adopt active integrating circuit and digital integrator in the application.
Active integrating circuit is the analogue integrator based on amplifier technology composition, desirable analogue integrator has good Frequency Response and width phase-frequency characteristic within the scope of certain frequency, and when air core coil and analogue integrator are ideal component, output voltage characteristic and the current characteristics once surveyed of analogue integrator can keep highly consistent, but in fact, by the impact of processing technology and electronic devices and components, air core coil and analogue integrator are all difficult to accomplish desirable state, the signal conditioning circuit of some complexity can only be adopted to process, to ensure the precision of sampled signal, although digital integrator can become technically realize high accuracy, highly sensitive integral operation, needs the digital signal processing chip of powerful and high-precision ADC and DAC and strong to algorithm dependence.
Summary of the invention
The purpose of this utility model is the defect overcoming prior art, provides a kind of structure simple, highly sensitive, the signal integration circuit of stable performance and circuit breaker intelligent controller.
For achieving the above object, the utility model have employed following technical scheme:
A kind of signal integration circuit, comprise the first operational amplifier U1, it is characterized in that: the inverting input of the first operational amplifier U1 and normal phase input end are connected with the first input end IN1 of signal integration circuit and the second input IN2 respectively, and the output of the first operational amplifier U1 is connected with the first output OUT of signal integration circuit; Also comprise low pass filter, the amplitude limiter circuit of the maximum output swing of restricting signal integrating circuit 2 and DC component circuit; Low pass filter is provided with at first input end IN1 with between the second input IN2 and the first operational amplifier U1, be provided with DC component circuit at first input end IN1 with between the second input IN2 and low pass filter, described amplitude limiter circuit is connected with the first operational amplifier U1 circuit; The normal phase input end of the reference voltage V ref that described DC component circuit also outputs signal with lifting and the first operational amplifier U1 is connected.
Further, described low pass filter comprises the first resistance R1, the second resistance R2 and the second electric capacity C2; One end of described first resistance R1 and the second resistance R2 is connected respectively to first input end IN1 and the second input IN2 of signal integration circuit, and the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier U1; One end of second electric capacity C2 is connected between the first resistance R1 and the first operational amplifier U1, and the other end is connected between the second resistance R2 and the first operational amplifier U1.
Further, described amplitude limiter circuit comprises the 5th resistance R5,6th resistance R6, the power supply VCC of signal integration circuit are connected to the power positive end VDD of the first operational amplifier U1 through the 5th resistance R5, the earth terminal VSS of the first operational amplifier U1 is through the 6th resistance R6 ground connection.
Further, described DC component circuit comprises the 7th resistance R7 and the 8th resistance R8,7th resistance R7 and the 8th resistance R8 connects, after series connection, the other end of the 7th resistance R7 is connected between low pass filter and first input end IN1, and the other end of the 8th resistance R8 is connected between low pass filter and the second input IN2; The intermediate node of the 7th resistance R7 and the 8th resistance R8 is connected to reference voltage V ref, and the 4th electric capacity C4 and the 4th resistance R4 is in parallel, and the one end after parallel connection connects reference voltage V ref, and the other end is connected to the normal phase input end of the first operational amplifier U1.
Further, described low pass filter comprises the first resistance R1, the second resistance R2 and the second electric capacity C2; One end of described first resistance R1, the second resistance R2 is connected respectively to first input end IN1 and the second input IN2, and the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier U1; One end of second electric capacity C2 is connected between the first resistance R1 and the first operational amplifier U1, and the other end is connected between the second resistance R2 and the first operational amplifier U1; Described amplitude limiter circuit comprises the 5th resistance R5, the 6th resistance R6, and the power supply VCC of signal integration circuit is connected to the power positive end VDD of the first operational amplifier U1 through the 5th resistance R5, and the earth terminal VSS of the first operational amplifier U1 is through the 6th resistance R6 ground connection; Described DC component circuit comprises the 7th resistance R7 and the 8th resistance R8,7th resistance R7 and the 8th resistance R8 connects, after series connection, the other end of the 7th resistance R7 is connected between the first resistance R1 and first input end IN1, and the other end of the 8th resistance R8 is connected between the second resistance R2 and the second input IN2; The intermediate node of the 7th resistance R7 and the 8th resistance R8 is connected to reference voltage V ref, and the 4th electric capacity C4 and the 4th resistance R4 is in parallel, and the one end after parallel connection connects reference voltage V ref, and the other end is connected to the normal phase input end of the first operational amplifier U1; Described signal integration circuit also comprises the first electric capacity C1, the 3rd electric capacity C3 and the 3rd resistance R3; The two ends of described first electric capacity C1 are connected with the other end of the 7th resistance R7 and the 8th resistance R8 respectively; 3rd electric capacity C3 and the 3rd resistance R3 are in parallel, and the output of two ends respectively with the first operational amplifier U1 after parallel connection is connected with inverting input.
Further, the amplitude peak that described amplitude limiter circuit can make the first operational amplifier U1 export is less than power supply VCC.
A kind of circuit breaker intelligent controller, comprises microcontroller circuit 3, above-mentioned signal integration circuit 2 and the power circuit 1 providing working power;
Described microcontroller circuit 3 is connected with trip circuit 4, and described trip circuit 4 is connected with magnetic flow convertor 7, and microcontroller circuit 3 can export control signal to trip circuit 4 and drive magnetic flow convertor 7 to make circuit breaker tripping;
The input of described signal integration circuit 2 is connected the current signal for obtaining main circuit with hollow transformer 101, the differential signal of hollow transformer 101 is reduced into main circuit current directly proportional voltage signal;
The output of described signal integration circuit 2 is connected with making current control circuit 201 and amplifying circuit 202, the output of amplifying circuit 202 is connected processed voltage signal can be exported to microcontroller circuit 3 with the A/D translation interface of microcontroller circuit 3, and current signal is converted into digital quantity; Making current control circuit 201 is connected with trip circuit 4 and can directly outputs signal to trip circuit 4 and make magnetic flow convertor 7 drive circuit breaker tripping.
Further, described making current control circuit 201 comprises making current threshold voltage regulating circuit, in-phase amplification circuit and subtraction circuit; Sensitive switch SW1 delivery valve threshold voltage is accessed in described making current threshold voltage regulating circuit, threshold voltage exports making current threshold values upper voltage limit MCR_H after in-phase amplification circuit, and making current threshold values upper voltage limit MCR_H exports making current lower threshold voltage MCR_L after subtraction circuit.
Further, described making current threshold voltage regulating circuit comprises the 9th resistance R9 and the tenth resistance R10, supply voltage VCC is connected to the Chang Kaiduan NO of sensitive switch SW1 after the 9th resistance R9 that is connected in series and the tenth resistance R10, the normal-closed end NC of sensitive switch SW1 is connected to power supply ground GND, sensitive switch SW1) common port COM be connected to the positive pole of the 5th electric capacity C5, the negative pole of the 5th electric capacity C5 is connected to power supply ground GND, described in-phase amplification circuit comprises the 7th operational amplifier U3B, and the intermediate node of the 9th resistance R9 and the tenth resistance R10 is connected to the normal phase input end of the 7th operational amplifier U3B, and the output of the 7th operational amplifier U3B is connected with inverting input, described subtraction circuit comprises the 11 resistance R11, one end of 11 resistance R11 is connected to the inverting input of the 7th operational amplifier U3B, the other end is connected to the inverting input of the 8th operational amplifier U3C, one end of 12 resistance R12 is connected to the inverting input of the 8th operational amplifier U3C, the other end is connected to the output of the 8th operational amplifier U3C, power supply VCC is connected to the normal phase input end of the 8th operational amplifier U3C through the 13 resistance R13, one end of 14 resistance R14 is connected to the normal phase input end of the 8th operational amplifier U3C, other end ground connection, the output of the 7th operational amplifier U3B exports making current threshold values upper voltage limit MCR_H, and the output of the 8th operational amplifier U3C exports making current lower threshold voltage MCR_L.
Further, described making current threshold values upper voltage limit MCR_H is connected respectively to the second operational amplifier U2A, the inverting input of the 5th operational amplifier U2D and the 6th operational amplifier U3A; Making current lower threshold voltage MCR_L is connected respectively to the 3rd operational amplifier U2B, the normal phase input end of four-operational amplifier U2C and the 9th operational amplifier U3D; Current signal IC is connected respectively to positive and the inverting input of the second operational amplifier U2A and the 3rd operational amplifier U2B, current signal IB is connected respectively to positive and the inverting input of the 5th operational amplifier U2D and four-operational amplifier U2C, and current signal IA is connected respectively to positive and the inverting input of the 6th operational amplifier U3A and the 9th operational amplifier U3D; Second operational amplifier U2A, the 3rd operational amplifier U2B, four-operational amplifier U2C, the 5th operational amplifier U2D, the 9th operational amplifier U3D are connected with the positive pole of the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 and the 6th diode D6 respectively with the output of the 6th operational amplifier U3A, and the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5 connect together with the negative pole of the 6th diode D6 and export the output control CTL_DO that threads off.
Further, instrument transformer 102 saturated with speed and accessory power supply 111 are connected the input of described power circuit 1 respectively, described microcontroller circuit 3 also can with circuit 5 of adjusting, communicating circuit 6, display module 8, input through keyboard 9, imput output circuit 10, IIC data storage circuit 11, position of the switch testing circuit 12 is connected with LED state indicating circuit 13; External switch signal is input in microcontroller circuit 3 by photoelectrical coupler by imput output circuit 10, and by relay, the control signal of microcontroller circuit 3 is outputted to outside; Position of the switch testing circuit 12 by detect and the synchronous sensitive switch SW1 signal in killer switch position obtain circuit breaker point/"on" position, and provide switching signal to making current control circuit 201 simultaneously.
Signal integration circuit precision of the present utility model and highly sensitive, structure is simple, and convenient design, in the sampling circuit of circuit breaker intelligent controller, has stronger antijamming capability, can simplify overall signal treatment circuit; Add amplitude limiter circuit, two that eliminate comparator circuit in follow-up making current control circuit are compared the identical possibility of input level, improve circuit reliability of operation; Add DC component circuit simultaneously, introduce DC component, improve the signal to noise ratio of intelligence integrator, the output signal of lifting simultaneously, ensure that signal is all the time within the scope of ADC sampled voltage, make sampling digital quantity and actual signal consistent with each other.
Accompanying drawing explanation
Fig. 1 is the block diagram of the utility model circuit breaker intelligent controller;
Fig. 2 is the circuit diagram of the utility model signal integration circuit;
Fig. 3 is the first output waveform figure of the utility model signal integration circuit;
Fig. 4 is the second output waveform figure of the utility model signal integration circuit;
Fig. 5 is the circuit diagram of the utility model making current control circuit;
Fig. 6 is the first output waveform figure of the utility model making current control circuit;
Fig. 7 is the second output waveform figure of the utility model making current control circuit.
Embodiment
Below in conjunction with the embodiment that accompanying drawing 1 to 5 provides, further illustrate the embodiment of signal integration circuit of the present utility model and the circuit breaker intelligent controller with signal integration circuit.Signal integration circuit of the present utility model and be not limited to the description of following examples with the circuit breaker intelligent controller of signal integration circuit.
As shown in Figure 1, circuit breaker intelligent controller of the present utility model comprises microcontroller circuit 3, signal integration circuit 2 and power circuit 1.Described power circuit 1 respectively instrument transformer 102 saturated with speed and accessory power supply 111 is connected and can be used for providing working power.Described microcontroller circuit 3 is connected with trip circuit 4, and described trip circuit 4 is connected with magnetic flow convertor 7, and microcontroller circuit 3 can export control signal to trip circuit 4 and drive magnetic flow convertor 7 to make circuit breaker tripping.The input of described signal integration circuit 2 is connected the current signal for obtaining main circuit with hollow transformer 101, the differential signal of hollow transformer 101 is reduced into main circuit current directly proportional voltage signal.The output of described signal integration circuit 2 is connected with making current control circuit 201 and amplifying circuit 202, the output of amplifying circuit 202 is connected processed voltage signal can be exported to microcontroller circuit 3 with the A/D translation interface of microcontroller circuit 3, and current signal is converted into digital quantity; Making current control circuit 201 is connected with trip circuit 4 and can directly outputs signal to trip circuit 4 and make magnetic flow convertor 7 drive circuit breaker tripping.Circuit breaker intelligent controller of the present utility model, simple and reasonable, stable performance, production cost is low.
As shown in Figure 1, the microcontroller circuit 3 of circuit breaker intelligent controller of the present utility model is the core controller circuit of whole controller, can realize the functions such as Current calculation, harmonic analysis, clock process, region linkage process, load monitoring process, fault alarm process, failure logging process, waveform capture process, long delay process, short time delay process, instantaneous process, earth fault process, current imbalance process, self diagnosis process and heat memory process.The input of power circuit 1 respectively instrument transformer 102 saturated with speed and accessory power supply 111 is connected, and the output of power circuit 1 comprises+24V output, VCC output and with reference to ground output GND; Power circuit 1 converts saturated for speed instrument transformer 102 power supply and accessory power supply 111 to+24V and VCC power supply, and+24V power supply provides driving power to trip circuit 4, and VCC power supply provides working power to other circuit.Whether the combined floodgate twinkling signal integrating circuit 2 that making current control circuit 201 detects circuit breaker exists big current situation, if there is big current situation, directly triggers trip circuit 4 and makes breaker open operation, reach the function connecting protection fast.Trip circuit 4 receives the dropout triggering signal of making current control circuit 201 and microcontroller circuit 3, then dropout triggering signal is amplified rear drive magnetic flow convertor 7.
As shown in Figure 1, circuit breaker intelligent controller of the present utility model also comprises circuit 5 of adjusting, communicating circuit 6, display module 8, input through keyboard 9, imput output circuit 10, IIC data storage circuit 11, position of the switch testing circuit 12 and LED state indicating circuit 13.Parameter value needed for user is transferred to microcontroller circuit 3 by button or dial-up mode by circuit 5 of adjusting.Communicating circuit 6 is the bridges connecting external communication bus and microcontroller circuit 3, by it, can realize the remote communicating function of circuit breaker intelligent controller.Display module circuit 8 carries out the contents such as display current value, setting parameter, fault message by LED/LCD mode.Input through keyboard circuit 9, by touch-switch mode, is connected to microcontroller circuit 3, obtains different key functions by input through keyboard circuit 9, realize various operational requirements.External switch signal is input in microcontroller circuit 3 by photoelectrical coupler by imput output circuit 10; By relay, the control signal of microcontroller circuit 3 is outputted to outside.Data storage and microcontroller circuit 3 are coupled together by iic bus by IIC data storage circuit 11, store the data such as user's setting value, failure logging.Position of the switch testing circuit 12 by detect and the synchronous sensitive switch SW1 signal in killer switch position obtain circuit breaker point/"on" position, and provide switching signal to making current control circuit 201 simultaneously.LED state indicating circuit 13 indicates current state or the current failure state of adjusting by the light on and off of LED light.
As shown in Figure 2, signal integration circuit of the present utility model, comprises the first operational amplifier U1.The inverting input of described first operational amplifier U1 and normal phase input end are connected with the first input end IN1 of signal integration circuit and the second input IN2 respectively, and the output of the first operational amplifier U1 is connected with the first output OUT of signal integration circuit; Also comprise low pass filter, the amplitude limiter circuit of the maximum output swing of restricting signal integrating circuit 2 and DC component circuit; Low pass filter is provided with at first input end IN1 with between the second input IN2 and the first operational amplifier U1, be provided with DC component circuit at first input end IN1 with between the second input IN2 and low pass filter, described amplitude limiter circuit is connected with the first operational amplifier U1 circuit; The normal phase input end of the reference voltage V ref that described DC component circuit also outputs signal with lifting and the first operational amplifier U1 is connected.Signal integration circuit precision of the present utility model and highly sensitive, structure is simple, and convenient design, in the sampling circuit of circuit breaker intelligent controller, has stronger antijamming capability, can simplify overall signal treatment circuit; Add amplitude limiter circuit, two that eliminate comparator circuit in follow-up making current control circuit are compared the identical possibility of input level, improve circuit reliability of operation; Add DC component circuit simultaneously, introduce DC component, improve the signal to noise ratio of intelligence integrator, the output signal of lifting simultaneously, ensure that signal is all the time within the scope of ADC sampled voltage, make sampling digital quantity and actual signal consistent with each other.
As shown in Figure 2, described low pass filter comprises the first resistance R1, the second resistance R2 and the second electric capacity C2; One end of described first resistance R1, the second resistance R2 is connected respectively to first input end IN1 and the second input IN2, and the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier U1; One end of second electric capacity C2 is connected between the first resistance R1 and the first operational amplifier U1, and the other end is connected between the second resistance R2 and the first operational amplifier U1; Described amplitude limiter circuit comprises the 5th resistance R5, the 6th resistance R6, and the power supply VCC of signal integration circuit is connected to the power positive end VDD of the first operational amplifier U1 through the 5th resistance R5, and the earth terminal VSS of the first operational amplifier U1 is through the 6th resistance R6 ground connection; Described DC component circuit comprises the 7th resistance R7 and the 8th resistance R8,7th resistance R7 and the 8th resistance R8 connects, after series connection, the other end of the 7th resistance R7 is connected between the first resistance R1 and first input end IN1, and the other end of the 8th resistance R8 is connected between the second resistance R2 and the second input IN2; The intermediate node of the 7th resistance R7 and the 8th resistance R8 is connected to reference voltage V ref, and the 4th electric capacity C4 and the 4th resistance R4 is in parallel, and the one end after parallel connection connects reference voltage V ref, and the other end is connected to the normal phase input end of the first operational amplifier U1; Described signal integration circuit also comprises the first electric capacity C1, the 3rd electric capacity C3 and the 3rd resistance R3; The two ends of described first electric capacity C1 are connected with the other end of the 7th resistance R7 and the 8th resistance R8 respectively; 3rd electric capacity C3 and the 3rd resistance R3 are in parallel, and the output of two ends respectively with the first operational amplifier U1 after parallel connection is connected with inverting input.
As shown in Figure 2, described low pass filter comprises the first resistance R1, second resistance R2 and the second electric capacity C2, one end of described first resistance R1, the second resistance R2 is connected respectively to first input end IN1 and the second input IN2 of signal integration circuit, the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier U1, forms Differential Input mode; One end of second electric capacity C2 is connected between the first resistance R1 and the first operational amplifier U1, and the other end is connected between the second resistance R2 and the first operational amplifier U1.Described low pass filter (i.e. passive integrator), almost do not have amplification to DC component, and have amplification for AC signal, formula is as follows:
The two ends of the first electric capacity C1 are connected, in order to filtering high-frequency signal with the first input end IN1 of signal integration circuit and the second input IN2 respectively.
As shown in Figure 2, described amplitude limiter circuit comprises the 5th resistance R5, and the 6th resistance R6, power supply VCC are connected to the power positive end VDD of the first operational amplifier U1 through the 5th resistance R5, and the earth terminal VSS of the first operational amplifier U1 is through the 6th resistance R6 ground connection; 3rd electric capacity C3 and the 3rd resistance R3 are in parallel, and the output of two ends respectively with the first operational amplifier U1 after parallel connection is connected with inverting input.Seal in the 5th resistance R5 and the 6th resistance R6 in amplitude limiter circuit, limit the amplitude peak that the first operational amplifier U1 exports, guard signal circuit rear end, from the threat of crossing high pressure, ensure that circuit stability is run.3rd electric capacity C3 and the 3rd resistance R3 are in parallel, and the output of two ends respectively with the first operational amplifier U1 after parallel connection is connected with inverting input, forms active integrating circuit, the differential signal of current transformer output is reduced into actual signal; The 5th resistance R5 in amplitude limiter circuit, 6th resistance R6 also can change the 7th diode D7 and the 8th diode D8 into, power supply VCC is connected to the power positive end of the first operational amplifier U1 through the 7th diode D7, and the earth terminal of the first operational amplifier U1 is by the 8th diode D8 ground connection; Namely the positive pole of the 7th diode D7 is connected with power supply VCC, and negative pole is connected with the power positive end of the first operational amplifier U1, and the positive pole of the 8th diode D8 is connected with the earth terminal of the first operational amplifier U1, minus earth.Owing to accessing the 5th resistance R5 and the 6th resistance R6, or the 7th diode D7 and the 8th diode D8, the amplitude peak that first operational amplifier U1 is exported will be less than supply voltage VCC, two that eliminate comparator circuit in follow-up making current control circuit 201 are compared the identical possibility of input level, improve circuit reliability of operation, avoid the malfunction of intelligent controller.
As shown in Figure 3-4, magnitude of voltage, i.e. Max (VDD-VSS)≤V when described clipping range maximum should meet ADC full scale
r(V
rmagnitude of voltage for during ADC full scale).A () signal amplitude scope drops on Vref is baseline, and in the scope being bound with VDD and VSS, ADC full range voltage is V
r=(VCC-GND), signal voltage can by the complete tracking conversion of ADC; B () signal amplitude is too high, by signal integration circuit by the restriction of the voltage magnitude of signal between vdd and vss, excessive signal (exceeding the signal of design limit) will be limited.
As shown in Figure 2, described amplitude limiter circuit and low pass filter composition second-order circuit, the transition band of filter is narrowed, attenuation slope value strengthens, can make amplitude-frequency characteristic and phase-frequency characteristic preferably integrating circuit by the parameter arranging corresponding components and parts, the relation between its constrained input signal is as shown in the formula being expressed as:
U
out(t)＝-K
j∫U
in(t)
Wherein, U
outt () is output signal, U
int () is input signal.Described second-order circuit realizes signal integration circuit low frequency performance and phase characteristic, makes the voltage signal after integration more accurately reflect tested current signal, and highly sensitive, and structure is simple.
As shown in Figure 2, described DC component circuit comprises the 7th resistance R7 and the 8th resistance R8,7th resistance R7 and the 8th resistance R8 connects, after series connection, the other end of the 7th resistance R7 is connected between low pass filter and first input end IN1, and the other end of the 8th resistance R8 is connected between low pass filter and the second input IN2; The intermediate node of the 7th resistance R7 and the 8th resistance R8 is connected to reference voltage V ref, and the 4th electric capacity C4 and the 4th resistance R4 is in parallel, and the one end after parallel connection connects reference voltage V ref, and the other end is connected to the normal phase input end of the first operational amplifier U1.7th resistance R7 and the 8th resistance R8 and above-mentioned second-order circuit set up DC channel, introduce DC component Vref, improve the signal to noise ratio of signal integration circuit; 4th electric capacity C4 and the 4th resistance R4 is in parallel, and the one end after parallel connection connects reference voltage V ref, and the other end is connected to the normal phase input end of the first operational amplifier U1, forms add circuit, the zero point of output signal is raised to Vref; Signal lifting can ensure signal all the time within the scope of ADC sampled voltage, avoid occur sampling spilling cause sampling digital quantity and actual signal inconsistent, ADC analog-to-digital conversion is shown below:
In addition, the offset voltage of signal integration circuit, the temperature drift impact of electric current, the imbalance temperature drift Δ U of its correspondence
iOwith Δ I
iOthe relative error caused is
computing formula is as follows:
The relative error of visible integrating circuit and input voltage U
ibe inversely proportional to, i.e. input voltage U
iless, relative error is larger, therefore will improve the precision of signal integration circuit, and the error reducing the drift of imbalance temperature is necessary.DC component circuit is by the 7th resistance R7,8th resistance R8 introduces DC component at two inputs of circuit, the signal to noise ratio of signal integration circuit can be improved, introduce bias voltage through the 4th resistance R4 simultaneously, the DC component consistent with reference voltage V ref will be formed like this at the output of signal integration circuit, because operational amplifier U1 is to the good following feature of DC component, the error effect of temperature drift to integrator of lacking of proper care can be reduced like this, improve the precision of signal integration circuit.
As shown in Figure 5, described making current control circuit 201 comprises making current threshold voltage regulating circuit, in-phase amplification circuit and subtraction circuit; Sensitive switch SW1 delivery valve threshold voltage is accessed in described making current threshold voltage regulating circuit, threshold voltage exports making current threshold values upper voltage limit MCR_H after in-phase amplification circuit, and making current threshold values upper voltage limit MCR_H exports making current lower threshold voltage MCR_L after subtraction circuit.Described making current control circuit 201 directly accesses one group of sensitive switch SW1 and connects making current threshold voltage regulating circuit, and connection line is simple and reliable.
As shown in Figure 5, described making current threshold voltage regulating circuit comprises the 9th resistance R9 and the tenth resistance R10, supply voltage VCC is connected to the Chang Kaiduan NO of sensitive switch SW1 after the 9th resistance R9 that is connected in series and the tenth resistance R10, the normal-closed end NC of sensitive switch SW1 is connected to power supply ground GND, the common port COM of sensitive switch SW1 is connected to the positive pole of the 5th electric capacity C5, and the negative pole of the 5th electric capacity C5 is connected to power supply ground GND.Described making current threshold voltage regulating circuit can at the normal-closed end NC of sensitive switch SW1, and mutually change between Chang Kaiduan NO and common port COM, connection line is simple and reliable.
As shown in Figure 5, described in-phase amplification circuit comprises the 7th operational amplifier U3B, the intermediate node of the 9th resistance R9 and the tenth resistance R10 is connected to the normal phase input end of the 7th operational amplifier U3B, and the output of the 7th operational amplifier U3B is connected with inverting input, described subtraction circuit comprises the 11 resistance R11, one end of 11 resistance R11 is connected to the inverting input of the 7th operational amplifier U3B, the other end is connected to the inverting input of the 8th operational amplifier U3C, one end of 12 resistance R12 is connected to the inverting input of the 8th operational amplifier U3C, the other end is connected to the output of the 8th operational amplifier U3C, power supply VCC is connected to the normal phase input end of the 8th operational amplifier U3C through the 13 resistance R13, one end of 14 resistance R14 is connected to the normal phase input end of the 8th operational amplifier U3C, other end ground connection, the output of the 7th operational amplifier U3B exports making current threshold values upper voltage limit MCR_H, and the output of the 8th operational amplifier U3C exports making current lower threshold voltage MCR_L.
As shown in Figure 5, making current threshold values upper voltage limit MCR_H is connected respectively to the second operational amplifier U2A, the inverting input of the 5th operational amplifier U2D and the 6th operational amplifier U3A, making current lower threshold voltage MCR_L is connected respectively to the 3rd operational amplifier U2B, the normal phase input end of four-operational amplifier U2C and the 9th operational amplifier U3D, current signal IC is connected respectively to positive and the inverting input of the second operational amplifier U2A and the 3rd operational amplifier U2B, current signal IB is connected respectively to positive and the inverting input of the 5th operational amplifier U2D and four-operational amplifier U2C, and current signal IA is connected respectively to positive and the inverting input of the 6th operational amplifier U3A and the 9th operational amplifier U3D, second operational amplifier U2A, 3rd operational amplifier U2B, four-operational amplifier U2C, 5th operational amplifier U2D, the output of the 9th operational amplifier U3D and the 6th operational amplifier U3A is respectively by the first diode D1, second diode D2, 3rd diode D3, 4th diode D4, the relation of the "or" that the 5th diode D5 and the 6th diode D6 is formed is connected to thread off and exports control CTL_DO, i.e. the second operational amplifier U2A, 3rd operational amplifier U2B, four-operational amplifier U2C, 5th operational amplifier U2D, the output of the 9th operational amplifier U3D and the 6th operational amplifier U3A respectively with the first diode D1, second diode D2, 3rd diode D3, 4th diode D4, 5th diode D5 is connected with the positive pole of the 6th diode D6, first diode D1, second diode D2, 3rd diode D3, 4th diode D4, 5th diode D5 connects together with the negative pole of the 6th diode D6 and exports the output control CTL_DO that threads off.
As shown in fig. 6-7, when described making current control circuit 201 works, work as breaker closing, sensitive switch SW1 is also synchronized with the movement, be transformed into by normally closed NC point and often open NO point, 5th electric capacity C5 starts charging, form a charging uphill process T1, be used for regulating making current threshold values upper voltage limit MCR_H and making current lower threshold voltage MCR_L, if during this period, current signal (IA, IB, IC) making current threshold values upper voltage limit MCR_H and making current lower threshold voltage MCR_L is greater than, generation is threaded off and is outputed signal CTL_DO by comparator output terminal, trip circuit 4 is driven to carry out magnetic flow convertor 7 action, circuit breaker disconnects.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.
Claims (10)
1. a signal integration circuit, comprise the first operational amplifier (U1), it is characterized in that: the inverting input of the first operational amplifier (U1) and normal phase input end are connected with the first input end (IN1) of signal integration circuit and the second input (IN2) respectively, and the output of the first operational amplifier (U1) is connected with first output (OUT) of signal integration circuit; Also comprise low pass filter, the amplitude limiter circuit of the maximum output swing of restricting signal integrating circuit (2) and DC component circuit; Low pass filter is provided with at first input end (IN1) with between the second input (IN2) and the first operational amplifier (U1), be provided with DC component circuit at first input end (IN1) with between the second input (IN2) and low pass filter, described amplitude limiter circuit is connected with the first operational amplifier (U1) circuit; The reference voltage (Vref) that described DC component circuit also outputs signal with lifting and the normal phase input end of the first operational amplifier (U1) are connected.
2. signal integration circuit according to claim 1, is characterized in that: described low pass filter comprises the first resistance (R1), the second resistance (R2) and the second electric capacity (C2); One end of described first resistance (R1) and the second resistance (R2) is connected respectively to first input end (IN1) and second input (IN2) of signal integration circuit, and the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier (U1); One end of second electric capacity (C2) is connected between the first resistance (R1) and the first operational amplifier (U1), and the other end is connected between the second resistance (R2) and the first operational amplifier (U1).
3. signal integration circuit according to claim 1, it is characterized in that: described amplitude limiter circuit comprises the 5th resistance (R5), 6th resistance (R6), the power supply (VCC) of signal integration circuit is connected to the power positive end (VDD) of the first operational amplifier (U1) through the 5th resistance (R5), the earth terminal (VSS) of the first operational amplifier (U1) is through the 6th resistance (R6) ground connection.
4. signal integration circuit according to claim 1, it is characterized in that: described DC component circuit comprises the 7th resistance (R7) and the 8th resistance (R8), 7th resistance (R7) and the series connection of the 8th resistance (R8), after series connection, the other end of the 7th resistance (R7) is connected between low pass filter and first input end (IN1), and the other end of the 8th resistance (R8) is connected between low pass filter and the second input (IN2); The intermediate node of the 7th resistance (R7) and the 8th resistance (R8) is connected to reference voltage (Vref), 4th electric capacity (C4) and the parallel connection of the 4th resistance (R4), one end after parallel connection connects reference voltage (Vref), and the other end is connected to the normal phase input end of the first operational amplifier (U1).
5. signal integration circuit according to claim 1, is characterized in that: described low pass filter comprises the first resistance (R1), the second resistance (R2) and the second electric capacity (C2); One end of described first resistance (R1), the second resistance (R2) is connected respectively to first input end (IN1) and the second input (IN2), and the other end is connected respectively to inverting input and the normal phase input end of the first operational amplifier (U1); One end of second electric capacity (C2) is connected between the first resistance (R1) and the first operational amplifier (U1), and the other end is connected between the second resistance (R2) and the first operational amplifier (U1); Described amplitude limiter circuit comprises the 5th resistance (R5), 6th resistance (R6), the power supply (VCC) of signal integration circuit is connected to the power positive end (VDD) of the first operational amplifier (U1) through the 5th resistance (R5), the earth terminal (VSS) of the first operational amplifier (U1) is through the 6th resistance (R6) ground connection; Described DC component circuit comprises the 7th resistance (R7) and the 8th resistance (R8), 7th resistance (R7) and the series connection of the 8th resistance (R8), after series connection, the other end of the 7th resistance (R7) is connected between the first resistance (R1) and first input end (IN1), and the other end of the 8th resistance (R8) is connected between the second resistance (R2) and the second input (IN2); The intermediate node of the 7th resistance (R7) and the 8th resistance (R8) is connected to reference voltage (Vref), 4th electric capacity (C4) and the parallel connection of the 4th resistance (R4), one end after parallel connection connects reference voltage (Vref), and the other end is connected to the normal phase input end of the first operational amplifier (U1); Described signal integration circuit also comprises the first electric capacity (C1), the 3rd electric capacity (C3) and the 3rd resistance (R3); The two ends of described first electric capacity (C1) are connected with the other end of the 7th resistance (R7) and the 8th resistance (R8) respectively; 3rd electric capacity (C3) and the 3rd resistance (R3) are in parallel, and the output at two ends respectively with the first operational amplifier (U1) after parallel connection is connected with inverting input.
6. the signal integration circuit according to claim 3 or 5, is characterized in that: the amplitude peak that described amplitude limiter circuit can make the first operational amplifier (U1) export is less than power supply (VCC).
7. a circuit breaker intelligent controller, is characterized in that: comprise microcontroller circuit (3), the arbitrary described signal integration circuit (2) of claim 1-6 and provide the power circuit (1) of working power;
Described microcontroller circuit (3) is connected with trip circuit (4), described trip circuit (4) is connected with magnetic flow convertor (7), and microcontroller circuit (3) can export control signal to trip circuit (4) and drive magnetic flow convertor (7) to make circuit breaker tripping;
The input of described signal integration circuit (2) is connected the current signal for obtaining main circuit with hollow transformer (101), the differential signal of hollow transformer (101) is reduced into the directly proportional voltage signal with main circuit current;
The output of described signal integration circuit (2) is connected with making current control circuit (201) and amplifying circuit (202), the output of amplifying circuit (202) is connected with the A/D translation interface of microcontroller circuit (3) can export to microcontroller circuit (3) by processed voltage signal, current signal is converted into digital quantity; Making current control circuit (201) is connected with trip circuit (4) and directly can outputs signal to trip circuit (4) and make magnetic flow convertor (7) drive circuit breaker tripping.
8. circuit breaker intelligent controller according to claim 7, is characterized in that: described making current control circuit (201) comprises making current threshold voltage regulating circuit, in-phase amplification circuit and subtraction circuit; Sensitive switch (SW1) delivery valve threshold voltage is accessed in described making current threshold voltage regulating circuit, threshold voltage exports making current threshold values upper voltage limit (MCR_H) after in-phase amplification circuit, and making current threshold values upper voltage limit (MCR_H) exports making current lower threshold voltage (MCR_L) after subtraction circuit.
9. circuit breaker intelligent controller according to claim 8, it is characterized in that: described making current threshold voltage regulating circuit comprises the 9th resistance (R9) and the tenth resistance (R10), supply voltage (VCC) is connected to the Chang Kaiduan (NO) of sensitive switch (SW1) after the 9th resistance (R9) that is connected in series and the tenth resistance (R10), the normal-closed end (NC) of sensitive switch (SW1) with being connected to power supply (GND), the common port (COM) of sensitive switch (SW1) is connected to the positive pole of the 5th electric capacity (C5), the negative pole of the 5th electric capacity (C5) with being connected to power supply (GND), described in-phase amplification circuit comprises the 7th operational amplifier (U3B), the intermediate node of the 9th resistance (R9) and the tenth resistance (R10) is connected to the normal phase input end of the 7th operational amplifier (U3B), and the output of the 7th operational amplifier (U3B) is connected with inverting input, described subtraction circuit comprises the 11 resistance (R11), one end of 11 resistance (R11) is connected to the inverting input of the 7th operational amplifier (U3B), the other end is connected to the inverting input of the 8th operational amplifier (U3C), one end of 12 resistance (R12) is connected to the inverting input of the 8th operational amplifier (U3C), the other end is connected to the output of the 8th operational amplifier (U3C), power supply (VCC) is connected to the normal phase input end of the 8th operational amplifier (U3C) through the 13 resistance (R13), one end of 14 resistance (R14) is connected to the normal phase input end of the 8th operational amplifier (U3C), other end ground connection, the output of the 7th operational amplifier (U3B) exports making current threshold values upper voltage limit (MCR_H), and the output of the 8th operational amplifier (U3C) exports making current lower threshold voltage (MCR_L).
10. circuit breaker intelligent controller according to claim 7, it is characterized in that: instrument transformer (102) saturated with speed and accessory power supply (111) are connected the input of described power circuit (1) respectively, described microcontroller circuit (3) also can with circuit of adjusting (5), communicating circuit (6), display module (8), input through keyboard (9), imput output circuit (10), IIC data storage circuit (11), position of the switch testing circuit (12) is connected with LED state indicating circuit (13); External switch signal is input in microcontroller circuit (3) by photoelectrical coupler by imput output circuit (10), and by relay, the control signal of microcontroller circuit (3) is outputted to outside; Position of the switch testing circuit (12) by detect and synchronous sensitive switch (SW1) signal in killer switch position obtain circuit breaker point/"on" position, and provide switching signal to making current control circuit (201) simultaneously.
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| CN201520074358.9U CN204652047U (en) | 2015-02-02 | 2015-02-02 | Signal integration circuit and circuit breaker intelligent controller |
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| CN201520074358.9U CN204652047U (en) | 2015-02-02 | 2015-02-02 | Signal integration circuit and circuit breaker intelligent controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659916A (en) * | 2015-02-02 | 2015-05-27 | 浙江正泰电器股份有限公司 | Signal integral circuit and intelligent circuit breaker controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659916A (en) * | 2015-02-02 | 2015-05-27 | 浙江正泰电器股份有限公司 | Signal integral circuit and intelligent circuit breaker controller |
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| GR01 | Patent grant | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wenzhou Zhengtai Electrical Technology Co., Ltd Assignor: Zhejiang Chint Electrics Co.,Ltd. Contract record no.: X2020330000078 Denomination of utility model: Intelligent controller of signal integrating circuit and circuit breaker Granted publication date: 20150916 License type: Common License Record date: 20201021 |