CN103698578A - Power output control method of automatic electric power meter reading system and automatic electric power meter reading system - Google Patents
Power output control method of automatic electric power meter reading system and automatic electric power meter reading system Download PDFInfo
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- CN103698578A CN103698578A CN201310732694.3A CN201310732694A CN103698578A CN 103698578 A CN103698578 A CN 103698578A CN 201310732694 A CN201310732694 A CN 201310732694A CN 103698578 A CN103698578 A CN 103698578A
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- voltage
- collection terminal
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- signal
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Abstract
The invention discloses an automatic electric power meter reading system, which comprises a collection end and a detection circuit, wherein collection end is connected with an external current analog signal source so as to acquire a current signal; the detection circuit is used for outputting a modulation voltage according to a control signal, the detection circuit is also provided with a first sensing circuit and a second sensing circuit, the first sensing circuit is used for acquiring a first voltage signal according to the current signal outputted by the collection end; the second sensing circuit is used for acquiring a second voltage signal according to the current signal outputted by the collection end; the collection end is also provided with a power control circuit which is used for limiting the voltage signal within a preset value range. Two voltage values are tested by testing the impedance of a circuit between the collection end and a load, the compensation voltage is fed back by calculating the amplitude ratio of the voltage gain, the original total load voltage can be completely compensated, so that the loss and voltage fluctuation of the collection end can be avoided, and the voltage upper limit is limited through the power control circuit. The invention also discloses a power output control method of the automatic electric power meter reading system.
Description
Technical field
The present invention relates to electric system electric power acquisition technology, in more specific words it, the embodiment of the present invention relates to a kind of signals collecting assembly with control function of power for electric system Acquisition Circuit.
Background technology
The voltage collection circuit of conventional ammeter is generally to adopt the modes such as divider resistance, electric capacity or Hall collection, the mode that wherein adopts Hall to gather is comparatively quick, copper-manganese dividing potential drop mode for example, and that shortcoming is cost is higher, and sample test price is higher, be difficult to accomplish voltage stabilization in the situation that meeting electrical isolation, therefore need to make improvement.
Summary of the invention
There is power stage and control the AMRS of function, comprise collection terminal, for connecting foreign current simulation signal generator to obtain current signal; Testing circuit, be coupled in described collection terminal and pick out to load circuit, for exporting a modulation voltage according to control signal, wherein, described testing circuit is further provided with: the first sensing circuit, connects described collection terminal and obtain first voltage signal for the current signal of exporting according to collection terminal; The second sensing circuit, connects described collection terminal and obtains a second voltage signal for the current signal of exporting according to collection terminal; Described collection terminal is further provided with: power control circuit, is connected between described first, second sensing circuit and for voltage signal being limited within the scope of a preset value.
In one embodiment, described measurement circuit design in order to: obtain and detect first, second voltage signal.
In one embodiment, described measurement circuit design in order to: according to a first state of a control voltage, control one first of described collection terminal output and adjust voltage; According to a second state of a control voltage (or transient state changes the output voltage of described collection terminal), control one second of described collection terminal output again and adjust voltage.
In another embodiment, described measurement circuit design in order to: according to described first, adjust voltage and second and adjust voltage and judge difference between the two, with this, obtain a tertiary voltage, this voltage is to decide according to the voltage magnitude ratio between described collection terminal and load circuit.
In one embodiment, described measurement circuit design in order to: according to the first voltage signal, utilize resulting tertiary voltage to obtain a bucking voltage.
According to previous embodiment, in described load bypass, capacitor is set, so that carry out duty when conversion at described collection terminal as a low-impedance device under the first voltage and second voltage state, and make described first to adjust voltage and only by the impedance of the electrical equipment between collection terminal and load circuit, judged with the difference between the second adjustment voltage.
According to previous embodiment, described testing circuit further comprises a secondary testing circuit, in order to keep in the first magnitude of voltage and to control described collection terminal, changes its output voltage to export one second adjustment voltage.
According to previous embodiment, described testing circuit further comprises a ratio Circuit tuning, for described voltage magnitude ratio being adjusted to one, falls proportional magnitude of voltage with the total head of load circuit.
According to previous embodiment, described testing circuit further comprises a hardware state machine, for controlling the switching of the duty of described testing circuit between first and second voltage signal.
The technique effect of the embodiment of the present invention is apparent, by the impedance on loop between test collection terminal and load, test two magnitudes of voltage, the amplitude proportion that calculates voltage gain compensates the feedback of voltage, voltage through accurate Calculation can carry out full remuneration to this total load voltage originally, to avoid loss and the voltage fluctuation in collection terminal, and carry out the stop voltage upper limit by power control circuit.Meanwhile, it is in addition integrated that circuit of the present invention can be used as a chip, and circuit theory wherein also can realize miniaturization by the internal wiring of chip, is therefore worthy to be popularized.
Accompanying drawing explanation
The detailed technical scheme of the present invention is by by with reference to the in addition detailed description of the mode of accompanying drawing, wherein:
Fig. 1 is the major function structure electric diagram of circuit of the present invention;
Fig. 2 is the partial circuit schematic diagram of collection terminal in circuit of the present invention.
Embodiment
With reference to Fig. 1, there is the AMRS of control function of power, comprise collection terminal 2, for connecting foreign current simulation signal generator to obtain current signal; Testing circuit 1, be coupled in described collection terminal 2 and pick out to load circuit 3, for exporting a modulation voltage according to control signal, wherein, testing circuit 1 is further provided with: the first sensing circuit, connects described collection terminal 2 and obtain a first voltage signal V1 for the current signal I exporting according to collection terminal 2; The second sensing circuit, connects described collection terminal and obtains a second voltage signal V2 for the current signal I exporting according to collection terminal 2; Collection terminal 2 is further provided with: power control circuit D1, is connected between described first, second sensing circuit and for voltage signal being limited within the scope of a preset value.
In one embodiment, described measurement circuit design in order to: obtain and detect first, second signal (for example, by detecting the impedance loss R on load 3 loops
sENSEor R
lINEcarry out detectable voltage signals in addition).
In one embodiment, described measurement circuit design in order to: according to a first state of a control voltage GAIN1, control one first of described collection terminal 2 output and adjust voltage V
oUT1; According to a second state of a control voltage GAIN2(or transient state, change again the output voltage of described collection terminal) control one second of described collection terminal output and adjust voltage V
oUT2.
In another embodiment, 1 design of described testing circuit in order to: according to described first, adjust voltage V
oUT1with the second adjustment voltage V
oUT2judge difference between the two, with this, obtain a tertiary voltage GAIN3 or V
dROP, this voltage is for example, to decide according to the voltage magnitude ratio between described collection terminal 2 and load circuit 3 (10% gain ratio, can preset).
In one embodiment, 1 design of described testing circuit in order to: according to the first voltage signal V1, utilize resulting tertiary voltage V
dROPobtain a bucking voltage.
According to previous embodiment, described testing circuit 1 further comprises that a secondary testing circuit is (as the sampling hold circuit 50,52,82,92 in figure, connected mode between them illustrates as schemed), in order to keep in the first magnitude of voltage V1 and to control described collection terminal 2, change its output voltages to export one second adjustment voltage V
oUT2.
According to previous embodiment, described testing circuit 1 further comprises a ratio Circuit tuning, for described voltage magnitude ratio being adjusted to one, falls proportional magnitude of voltage with the total head of load circuit.
According to previous embodiment, described testing circuit further comprises a hardware state machine 4, for controlling the switching of the duty of described testing circuit between first and second voltage signal.
The circuit of Fig. 1 of take is described the technology intention of this technical scheme as example.First set change-over switch S1, so just can realize the switching between first, second sensing circuit, in the present invention, first, second sensing circuit does not have concrete mark or digital alphabet code name, but the mode of using by several components and parts, chip or alternate combinations has realized the different voltage/currents of output, and in the present invention, will specifically describe as follows:
Because used change-over switch S1, need so a for example DSP single-chip microcomputer equipment of state machine 4() periodically export control signal, for example, at T1 in the time cycle, be connected to a normal acquisition state, the collection electric current of collection terminal 2 and voltage are increased to stable state gradually this moment, with provide a voltage V1 to load 3( provide one completely load current to load 3), embodiment in Fig. 1 provides a backfeed loop, under this state, collection terminal 2 adopts the actual constant output voltage in this output loop to produce a feedback voltage and realizes adjustment.Now switch S 1 by 22 contacts that go between to feeding back amplifier 46, thereby it is constant with the input voltage that keeps inputing in feedback amplifier 46 to control the dutycycle of collection terminal 2.For example, can pick out a capacitor (not showing) on 22 and earth terminal guide wire is used as reference source at lead-in wire.
Under this normal condition of T1, differential amplifier 80 is amplified collection terminal 2 and a voltage on load 3 loops, in order to gather this voltage, uses a low values of resistors R
sENSE, by a driving source GAIN1 of state machine 4 outputs, voltage V who represents load 3 electric currents of amplifier 80 output
oUT1.
Electric current I on loop 14,15
lOADreach after steady-state current I1, state machine 4 is controlled sampling hold circuit 82 and is stored this V
oUT1numerical value (for example passing through register).Therefore can learn V
oUT1=GAIN1I1R
sENSE.Similarly, the voltage on loop 14,15 reaches after steady state voltage V1, and state machine 4 is controlled another sampling hold circuit 50 and stored this voltage V1, now can judge V1=V
lOAD+ (I1R
lINE), V wherein
lOADfor the voltage at load 3 two ends, and R
lINEfor the total resistance value going between on 14,15.
After above situation all meets, state machine 4 initializing circuits, contact fling-cut switch S1 to differential amplifier 88, and a larger driving source GAIN2 of state machine 4 outputs is to differential amplifier 80, makes amplifier 80 produce an output voltage V
oUT2thereby this backfeed loop is controlled collection terminal 2 so that the voltage of differential amplifier 88 end inputs is constant, i.e. V
oUT1=V
oUT2.At I
lOADwhile being reduced to a value that equals I1 (GAIN1/GAIN2), can enough realize constant.The reduction of this output current causes the reduction of output voltage V 2, thus V2=V
lOAD+ (I2R
lINE)=V
lOAD+ I1 (GAIN1/GAIN2) R
lINE.When output voltage V 2 reaches steady state voltage, output voltage V 2 is stored in sampling hold circuit 52, and now collection terminal is not exported one and adjusted voltage, and a bias voltage of output.
For example, by subtracter (comparator circuit) 68, produce V1-V2, this voltage transmission is also kept in to sampling hold circuit 92.This V1-V2 as a small size voltage difference (according to aforementioned, the part of technical scheme of the present invention form be by by this because small size voltage difference that the small size curent change on loop 14,15 produces is compensated to realize the stable output of collection terminal to Acquisition Circuit), thereby sampling hold circuit 92 can produce a driving source GAIN3, and it equals V
dROP/ (V1-V2)=GAIN2/ (GAIN2-GAIN1) (be aforementioned in resize ratio), in order to the virtual voltage on full remuneration loop 14,15.
Voltage V on load circuit
dROPwith a reference source 74(voltage magnitude be V
rEF1) by the rear addition of totalizer 75, produce a standard of compensation source V
rEF2, the output voltage of this standard of compensation source and collection terminal 2 is exported to feedback amplifier 46 subsequently.This moment, state machine 4 is controlled again the output terminal that fling-cut switch S1 connects amplifier 46, and collection terminal 2 is in running order to guarantee that output voltage meets V
rEF2, with the total voltage on compensating lead wire 14,15.
As shown in Figure 1, at the two ends of load 3, increase capacitor 42, to ensure that the load current in load 3 presents level and smooth slope change.According to previous embodiment, in described load bypass, capacitor 42 is set, so that carry out duty when conversion at described collection terminal 2 as a low-impedance device under the first voltage and second voltage state, and make described first to adjust difference between voltage and the second adjustment voltage only by the impedance R of the electrical equipment between collection terminal and load circuit
lINEor R
lOADjudge.
The further shows in detail of Fig. 2 collection terminal 2, wherein specifically comprise the power control circuit D1 that is arranged at circuit I+ and I-two interpolars, be preferably a bidirectional transistor, or the photoelectric device such as controllable silicon, with the input voltage that limits collection terminal 2 not higher than 0.7V.
Concrete protection domain of the present invention is limited by claims, should understand, and on the basis of previous embodiment, should have a lot of variation patterns, all should be covered by this limited range.
Claims (10)
1. the power stage control method of AMRS, is characterized in that comprising step: 1) under the first state, by a testing circuit, according to the current signal of collection terminal output, obtain first voltage signal; 2) by described testing circuit, according to the current signal of collection terminal output, obtain a second voltage signal; 3) difference between more described the first voltage signal and second voltage signal, judges between collection terminal and load circuit, whether there is pressure drop amplitude with this; 4) according to a first state of a control voltage, control one first of described collection terminal output and adjust voltage, according to a second state of a control voltage, control one second of described collection terminal output again and adjust voltage; 5) according to described the first adjustment voltage and second, adjust voltage and judge difference between the two, with this, obtain a tertiary voltage, wherein this tertiary voltage decides according to the voltage magnitude ratio between described collection terminal and load circuit.
2. AMRS, it comprises collection terminal, for connecting foreign current simulation signal generator to obtain current signal; Testing circuit, be coupled in described collection terminal and pick out to load circuit, for exporting a modulation voltage according to control signal, it is characterized in that: described testing circuit is further provided with: the first sensing circuit, connects described collection terminal and obtain first voltage signal for the current signal of exporting according to collection terminal; The second sensing circuit, connects described collection terminal and obtains a second voltage signal for the current signal of exporting according to collection terminal; Described collection terminal is further provided with: power control circuit, is connected between described first, second sensing circuit and for voltage signal being limited within the scope of a preset value.
3. AMRS according to claim 2, is characterized in that: described measurement circuit design is in order to obtain and to detect first, second voltage signal.
4. AMRS according to claim 2, it is characterized in that described measurement circuit design in order to: according to a first state of a control voltage, control one first of described collection terminal output and adjust voltage; The output voltage that changes described collection terminal according to a second state of a control voltage or transient state is again controlled one second of described collection terminal output and is adjusted voltage.
5. AMRS according to claim 2, it is characterized in that described measurement circuit design in order to: according to described first, adjust voltage and second and adjust voltage and judge difference between the two, with this, obtain a tertiary voltage, this voltage decides according to the voltage magnitude ratio between described collection terminal and load circuit.
6. according to the AMRS described in any one of claim 4 or 5, it is characterized in that described measurement circuit design in order to: according to the first voltage signal, utilize resulting tertiary voltage to obtain a bucking voltage.
7. AMRS according to claim 2, it is characterized in that: in described load bypass, capacitor is set, so that carry out duty when conversion at described collection terminal as a low-impedance device under the first voltage and second voltage state, and make described first to adjust voltage and only by the impedance of the electrical equipment between collection terminal and load circuit, judged with the difference between the second adjustment voltage.
8. AMRS according to claim 2, is characterized in that: described testing circuit further comprises a secondary testing circuit, in order to keep in the first magnitude of voltage and to control described collection terminal, changes its output voltage to export one second adjustment voltage.
9. AMRS according to claim 2, is characterized in that: described testing circuit further comprises a ratio Circuit tuning, for described voltage magnitude ratio being adjusted to one, falls proportional magnitude of voltage with the total head of load circuit.
10. AMRS according to claim 2, is characterized in that: described testing circuit further comprises a hardware state machine, for controlling the switching of the duty of described testing circuit between first and second voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310732694.3A CN103698578A (en) | 2013-12-26 | 2013-12-26 | Power output control method of automatic electric power meter reading system and automatic electric power meter reading system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310732694.3A CN103698578A (en) | 2013-12-26 | 2013-12-26 | Power output control method of automatic electric power meter reading system and automatic electric power meter reading system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730385A (en) * | 2015-03-16 | 2015-06-24 | 国家电网公司 | Power acquisition system based on Beidou navigation system |
| CN104732749A (en) * | 2015-03-16 | 2015-06-24 | 国家电网公司 | Electric power acquisition system |
| CN104898757A (en) * | 2015-03-16 | 2015-09-09 | 国家电网公司 | Power output control method of electric power acquisition system |
| CN106597087A (en) * | 2015-10-20 | 2017-04-26 | 华立科技股份有限公司 | Power collection circuit having load voltage complete-compensation function and method |
| WO2022170528A1 (en) * | 2021-02-09 | 2022-08-18 | 华为技术有限公司 | Voltage fluctuation compensation method and compensation circuit |
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| WO2022170528A1 (en) * | 2021-02-09 | 2022-08-18 | 华为技术有限公司 | Voltage fluctuation compensation method and compensation circuit |
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