CN105958435A - FPGA-based power grid overvoltage and undervoltage detection circuit and method - Google Patents
FPGA-based power grid overvoltage and undervoltage detection circuit and method Download PDFInfo
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- CN105958435A CN105958435A CN201610472435.5A CN201610472435A CN105958435A CN 105958435 A CN105958435 A CN 105958435A CN 201610472435 A CN201610472435 A CN 201610472435A CN 105958435 A CN105958435 A CN 105958435A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16523—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using diodes, e.g. Zener diodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
- G01R19/1658—AC voltage or recurrent signals
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention provides an FPGA-based power grid overvoltage and undervoltage detection circuit and method. When power grid overvoltage and undervoltage protection is achieved, valuable MCU resources are not occupied, and the hidden danger that a resistance value of an adjustable potentiometer is easy to change is avoided. The FPGA-based power grid overvoltage and undervoltage detection circuit comprises an absolute value circuit, a comparison circuit and an FPGA control module which are sequentially connected, wherein the absolute value circuit carries out absolute value conversion on collected power grid voltage; the comparison circuit compares an absolute value voltage signal obtained by absolute value circuit conversion with reference voltage, set by a fixed resistor, in the comparison circuit to obtain a string of pulse signals; and the FPGA control module processes the received pulse signals and gives an alarm for power grid overvoltage or undervoltage.
Description
Technical field
The present invention relates to power supply unit input protection field, particularly to a kind of electrical network overvoltage/undervoltage testing circuit based on FPGA and method.
Background technology
Having two kinds of methods for electrical network overvoltage or under-voltage detection employing at present, one is to use AD to be acquired line voltage, but the method to take considerable MCU resource, and algorithm is complicated, and reliability is low；Another method is to use hardware relative method, this method needs to use adjustable potentiometer to be adjusted, not only regulate inconvenience, and there is the hidden danger that adjustable potentiometer easily drifts about due to test point that poor contact of contacts is brought, and it is slow to need that AC signal is converted into direct current signal response speed.
Summary of the invention
The invention provides a kind of electrical network overvoltage/undervoltage testing circuit based on FPGA and method, while realizing electrical network overvoltage and under-voltage protection, be not take up the MCU resource of preciousness, and the hidden danger that the resistance that there is not adjustable potentiometer easily changes, fast response time.
For achieving the above object, technical solution of the present invention is:
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, including the absolute value circuit being sequentially connected with, comparison circuit and FPGA control module；
The line voltage collected is carried out absolute value conversion by described absolute value circuit；
The reference voltage set with fixed resistance in the absolute value voltage signal that described absolute value circuit is converted to by described comparison circuit and comparison circuit compares and obtains pulse train signal；
The described pulse signal received is processed by FPGA control module, to electrical network overvoltage or under-voltage report to the police.
Further, described absolute value circuit includes transformator T1, amplifier U1A, amplifier U1B, diode D1, diode D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6；The input of described transformator T1 accesses electrical network to be measured, and outfan one end ground connection of described transformator T1, the other end is divided into two-way after being connected with described resistance R1, and a road is connected with described resistance R2 one end, and another road is connected with the input cathode of described amplifier U1A；The other end of described resistance R2 be connected with the negative pole of described diode D1 connect with described resistance R4 again after access the input cathode of described amplifier U1B；The input anode ground connection of described amplifier U1A, outfan is divided into two-way, and a road is connected with the positive pole of described diode D1, and a road is connected with the negative pole of described diode D2；The positive pole of described diode D2 is divided into two-way, and the input cathode of described amplifier U1A is accessed on a road with described resistance R3 after connecting, and the input cathode of described amplifier U1B is accessed on another road with described resistance R5 after connecting；The input cathode of described amplifier U1B is connected with its outfan after being connected with described resistance R6；The outfan of described amplifier U1B accesses the input of described comparison circuit.
Further, described comparison circuit includes overvoltage comparison circuit and under-voltage comparison circuit.
Further, described overvoltage comparison circuit includes comparator U2A, resistance R8, resistance R9, resistance R10 and resistance R11；The input anode of described comparator U2A is connected with the outfan of described amplifier U1B；The first DC source is accessed in described resistance R9 one end, the other end connect with described resistance R8 after ground connection；The input cathode of described comparator U2A accesses described resistance R8 and the link node of described resistance R9；The outfan of described comparator U2A is divided into two-way, and the second DC source is accessed on a road with described resistance R10 after being connected, and the other end accesses the input of described FPGA module with described resistance R11 after connecting.
Further, described under-voltage comparison circuit includes comparator U2B, resistance R12, resistance R13, resistance R14 and resistance R15；The input anode of described comparator U2B is connected with the outfan of described amplifier U1B；The first DC source is accessed in described resistance R13 one end, the other end connect with described resistance R12 after ground connection；The input cathode of described comparator U2B accesses described resistance R12 and the link node of described resistance R13；The outfan of described comparator U2B is divided into two-way, and the second DC source is accessed on a road with described resistance R14 after being connected, and the other end accesses the input of described FPGA module with described resistance R15 after connecting.
Further, the voltage of described first DC source is 12V, and the voltage of described second DC source is 3.3V.
Further, the frequency of described pulse signal is 100Hz.
Further, described FPGA control module is configured to the pulsewidth of pulse signal described in receiving record and is compared with given pulse width threshold by the pwm value of described pulse signal, sends alarm signal when the pwm value of described pulse signal is beyond described given pulse width threshold.
A kind of electrical network overvoltage/undervoltage detection method based on FPGA, its detecting step is as follows:
(1), line voltage is converted to low-voltage ac signal through transformator；
(2), described low-voltage ac signal is carried out absolute value conversion through absolute value circuit, obtain positive voltage signal；
(3), described positive voltage signal is inputted to comparison circuit；
(4), described comparison circuit includes overvoltage comparison circuit and under-voltage comparison circuit, described positive voltage signal and respective reference voltage are compared and obtain pulse train signal by described overvoltage comparison circuit and described under-voltage comparison circuit respectively, and input comparative result to FPGA control module；
(5), the pulsewidth of the pulse signal of described FPGA control module record input, if described overvoltage pwm value is more than or equal to given overvoltage pulse width threshold, then FPGA sends alarm signal, such as less than given overvoltage pulse width threshold, then reset described overvoltage pulsewidth recording value and restart to record a pulsewidth；If described under-voltage pwm value is less than or equal to given under-voltage pulse width threshold, then FPGA sends alarm signal, such as larger than given under-voltage pulse width threshold, then described under-voltage pulsewidth recording value reset and restart to record a pulsewidth.
Further, when positive voltage signal described in its step (4) is more than the reference voltage of described overvoltage comparison circuit, described overvoltage comparison circuit output high level, otherwise output low level；When described positive voltage signal is more than the reference voltage of described under-voltage comparison circuit, described under-voltage comparison circuit output high level, otherwise output low level.
From the above-mentioned description of this invention, compared to the prior art, present invention have the advantage that
One, the present invention uses FPGA control module to detect the overvoltage/undervoltage of electrical network, circuit is simple, without using adjustable potentiometer, the most there is not the hidden danger that the resistance of adjustable potentiometer easily changes, improve the reliability of detection, and without judging after AC signal is converted into direct current signal, response speed is faster again.
Two, the present invention uses FPGA control module, and algorithm is simple, and no longer takies MCU resource and the AD mouth of preciousness, it is ensured that the execution of network system main task.
Three, by the digital regulated regulation that can realize pressure point and under-voltage point within FPGA in the present invention so that the regulation crossing pressure point and under-voltage point is more flexible and convenient.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the system block diagram of the present invention；
Fig. 2 is the circuit diagram of the present invention；
Fig. 3 is the waveform variation diagram that electric current of the present invention is changed through system；
Fig. 4 is the workflow diagram one of FPGA of the present invention；
Fig. 5 is the workflow diagram two of FPGA of the present invention.
Detailed description of the invention
In order to make the technical problem to be solved, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to figs. 1 through Fig. 5, a kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, including the absolute value circuit being sequentially connected with, comparison circuit and FPGA control module；
The line voltage collected is carried out absolute value conversion by described absolute value circuit；
The reference voltage set with fixed resistance in the absolute value voltage signal that described absolute value circuit is converted to by described comparison circuit and comparison circuit compares and obtains pulse train signal；The frequency of described pulse signal is 100Hz.
The described pulse signal received is processed by FPGA control module, to electrical network overvoltage or under-voltage report to the police.
Described absolute value circuit includes transformator T1, amplifier U1A, amplifier U1B, diode D1, diode D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6；The input of described transformator T1 accesses electrical network to be measured, and outfan one end ground connection of described transformator T1, the other end is divided into two-way after being connected with described resistance R1, and a road is connected with described resistance R2 one end, and another road is connected with the input cathode of described amplifier U1A；The other end of described resistance R2 be connected with the negative pole of described diode D1 connect with described resistance R4 again after access the input cathode of described amplifier U1B；The input anode ground connection of described amplifier U1A, outfan is divided into two-way, and a road is connected with the positive pole of described diode D1, and a road is connected with the negative pole of described diode D2；The positive pole of described diode D2 is divided into two-way, and the input cathode of described amplifier U1A is accessed on a road with described resistance R3 after connecting, and the input cathode of described amplifier U1B is accessed on another road with described resistance R5 after connecting；The input cathode of described amplifier U1B is connected with its outfan after being connected with described resistance R6；The outfan of described amplifier U1B accesses the input of described comparison circuit.
Described comparison circuit includes overvoltage comparison circuit and under-voltage comparison circuit.Described overvoltage comparison circuit includes comparator U2A, resistance R8, resistance R9, resistance R10 and resistance R11；The input anode of described comparator U2A is connected with the outfan of described amplifier U1B；The first DC source is accessed in described resistance R9 one end, the other end connect with described resistance R8 after ground connection；The input cathode of described comparator U2A accesses described resistance R8 and the link node of described resistance R9；The outfan of described comparator U2A is divided into two-way, and the second DC source is accessed on a road with described resistance R10 after being connected, and the other end accesses the input of described FPGA module with described resistance R11 after connecting.
Described under-voltage comparison circuit includes comparator U2B, resistance R12, resistance R13, resistance R14 and resistance R15；The input anode of described comparator U2B is connected with the outfan of described amplifier U1B；The first DC source is accessed in described resistance R13 one end, the other end connect with described resistance R12 after ground connection；The input cathode of described comparator U2B accesses described resistance R12 and the link node of described resistance R13；The outfan of described comparator U2B is divided into two-way, and the second DC source is accessed on a road with described resistance R14 after being connected, and the other end accesses the input of described FPGA module with described resistance R15 after connecting.The voltage of the first DC source is 12V, and the voltage of described second DC source is 3.3V.
Described FPGA control module is configured to the pulsewidth of pulse signal described in receiving record and is compared with given pulse width threshold by the pwm value of described pulse signal, sends alarm signal when the pwm value of described pulse signal is beyond described given pulse width threshold.
With reference to Fig. 3 to Fig. 5, wherein, in step (2) to step (5), the waveform change of voltage is with reference to Fig. 3,
A kind of electrical network overvoltage/undervoltage detection method based on FPGA, its detecting step is as follows:
(1), line voltage is converted to low-voltage ac signal through transformator；
(2), described low-voltage ac signal is carried out absolute value conversion through absolute value circuit, obtain positive voltage signal；
(3), described positive voltage signal is inputted to comparison circuit；
(4), described comparison circuit includes overvoltage comparison circuit and under-voltage comparison circuit, described positive voltage signal and respective reference voltage are compared and obtain pulse train signal by described overvoltage comparison circuit and described under-voltage comparison circuit respectively, and input comparative result to FPGA control module；
(5), the pulsewidth of the pulse signal of described FPGA control module record input, if described overvoltage pwm value is more than or equal to given overvoltage pulse width threshold, then FPGA sends alarm signal, such as less than given overvoltage pulse width threshold, then reset described overvoltage pulsewidth recording value and restart to record a pulsewidth；If described under-voltage pwm value is less than or equal to given under-voltage pulse width threshold, then FPGA sends alarm signal, such as larger than given under-voltage pulse width threshold, then described under-voltage pulsewidth recording value reset and restart to record a pulsewidth.
When positive voltage signal described in its step (4) is more than the reference voltage of described overvoltage comparison circuit, described overvoltage comparison circuit output high level, otherwise output low level；When described positive voltage signal is more than the reference voltage of described under-voltage comparison circuit, described under-voltage comparison circuit output high level, otherwise output low level.
The circuit diagram of the present invention is as in figure 2 it is shown, the model that wherein FPGA control module uses is EP4CE6, and the above-mentioned functions of this model module is to well known to a person skilled in the art, has only to the most in use just to realize above-mentioned function by programming.
Circuit diagram in the present invention is one-way circuit figure, if used in three-phase circuit figure, thus three unidirectional circuit are constituted.
Described above illustrate and describes the preferred embodiments of the present invention, as previously mentioned, it is to be understood that the present invention is not limited to form disclosed herein, it is not to be taken as the eliminating to other embodiments, and can be used for other combinations various, amendment and environment, and can be modified by above-mentioned teaching or the technology of association area or knowledge in invention contemplated scope described herein.And the change that those skilled in the art are carried out and change are without departing from the spirit and scope of the present invention, the most all should be in the protection domain of claims of the present invention.
Claims (10)
1. an electrical network overvoltage/undervoltage testing circuit based on FPGA, it is characterised in that: include being sequentially connected with
Absolute value circuit, comparison circuit and FPGA control module；
The line voltage collected is carried out absolute value conversion by described absolute value circuit；
In the absolute value voltage signal that described absolute value circuit is converted to by described comparison circuit and comparison circuit
The reference voltage set with fixed resistance compares and obtains pulse train signal；
The described pulse signal received is processed by FPGA control module, to electrical network overvoltage or under-voltage enter
Row is reported to the police.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: described absolute value circuit include transformator T1, amplifier U1A, amplifier U1B, diode D1, two
Pole pipe D2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6；Described change
The input of depressor T1 accesses electrical network to be measured, outfan one end ground connection of described transformator T1, the other end with
Described resistance R1 is divided into two-way after connecting, and a road is connected with described resistance R2 one end, and another road is put with described
The input cathode of big device U1A connects；The other end of described resistance R2 connects with the negative pole of described diode D1
Connect the input cathode accessing described amplifier U1B with described resistance R4 after connecting again；Described amplifier U1A
Input anode ground connection, outfan is divided into two-way, and a road is connected with the positive pole of described diode D1, a road
It is connected with the negative pole of described diode D2；The positive pole of described diode D2 is divided into two-way, a road and described electricity
The input cathode of described amplifier U1A is accessed, after connecting with described resistance R5 in another road after resistance R3 series connection
Access the input cathode of described amplifier U1B；The input cathode of described amplifier U1B and described resistance
R6 is connected with its outfan after connecting；The outfan of described amplifier U1B accesses the input of described comparison circuit
End.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: described comparison circuit includes overvoltage comparison circuit and under-voltage comparison circuit.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: described overvoltage comparison circuit includes comparator U2A, resistance R8, resistance R9, resistance R10 and resistance
R11；The input anode of described comparator U2A is connected with the outfan of described amplifier U1B；Described resistance
R9 accesses one end the first DC source, the other end connect with described resistance R8 after ground connection；Described comparator U2A
Input cathode access described resistance R8 and the link node of described resistance R9；Described comparator U2A's
Outfan is divided into two-way, and a road accesses the second DC source, the other end and institute with described resistance R10 after being connected
The input of described FPGA module is accessed after stating resistance R11 series connection.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: described under-voltage comparison circuit includes comparator U2B, resistance R12, resistance R13, resistance R14 and electricity
Resistance R15；The input anode of described comparator U2B is connected with the outfan of described amplifier U1B；Described electricity
Resistance R13 one end access the first DC source, the other end connect with described resistance R12 after ground connection；Described comparison
The input cathode of device U2B accesses described resistance R12 and the link node of described resistance R13；Described comparison
The outfan of device U2B is divided into two-way, and the second DC source is accessed after being connected with described resistance R14 in a road, separately
One end accesses the input of described FPGA module with described resistance R15 after connecting.
6. a kind of based on FPGA the electrical network overvoltage/undervoltage detection electricity as described in claim 4 and claim 5
Road, it is characterised in that: the voltage of described first DC source is 12V, the voltage of described second DC source
For 3.3V.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: the frequency of described pulse signal is 100Hz.
A kind of electrical network overvoltage/undervoltage testing circuit based on FPGA, its feature exists
In: described FPGA control module is configured to the pulsewidth of pulse signal described in receiving record and by described pulse signal
Pwm value compare with given pulse width threshold, at the pwm value of described pulse signal beyond described given
Alarm signal is sent during pulse width threshold.
9. an electrical network overvoltage/undervoltage detection method based on FPGA, it is characterised in that its detecting step is such as
Under:
(1), line voltage is converted to low-voltage ac signal through transformator；
(2), described low-voltage ac signal is carried out absolute value conversion through absolute value circuit, obtain positive voltage letter
Number；
(3), described positive voltage signal is inputted to comparison circuit；
(4), described comparison circuit include overvoltage comparison circuit and under-voltage comparison circuit, described overvoltage is more electric
Described positive voltage signal is compared with respective reference voltage and obtains by road and described under-voltage comparison circuit respectively
Pulse train signal, and comparative result is inputted to FPGA control module；
(5), the pulsewidth of pulse signal of described FPGA control module record input, if described overvoltage arteries and veins
Width values is more than or equal to given overvoltage pulse width threshold, then FPGA sends alarm signal, such as less than given overvoltage
Pulse width threshold, then reset described overvoltage pulsewidth recording value and restart to record a pulsewidth；If institute
State under-voltage pwm value and be less than or equal to given under-voltage pulse width threshold, then FPGA sends alarm signal, such as larger than gives
Fixed under-voltage pulse width threshold, then reset described under-voltage pulsewidth recording value and restart to record an arteries and veins
Wide.
A kind of electrical network overvoltage/undervoltage detection method based on FPGA, its feature exists
In: when positive voltage signal described in its step (4) is more than the reference voltage of described overvoltage comparison circuit, described
Overvoltage comparison circuit output high level, otherwise output low level；When described positive voltage signal is more than described under-voltage
During the reference voltage of comparison circuit, described under-voltage comparison circuit output high level, otherwise output low level.
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| CN107132424A (en) * | 2017-06-12 | 2017-09-05 | 卡斯柯信号有限公司 | A kind of device for gathering transponder C4 signals |
| CN107132424B (en) * | 2017-06-12 | 2024-03-29 | 卡斯柯信号有限公司 | Device for collecting C4 signal of transponder |
| CN108939296A (en) * | 2018-06-06 | 2018-12-07 | 广东紫薇星实业有限公司 | A method of for protecting Magnetotherapeutic apparatus power supply circuit over-voltage |
| CN111220841A (en) * | 2018-11-26 | 2020-06-02 | 皮尔茨公司 | Safe voltage monitoring |
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| CN113872148A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit, device and method |
| WO2022002000A1 (en) * | 2020-06-30 | 2022-01-06 | 比亚迪半导体股份有限公司 | Undervoltage protection circuit and device |
| CN112436488A (en) * | 2020-11-26 | 2021-03-02 | 广州金升阳科技有限公司 | Under-voltage protection circuit of DC-DC bootstrap power supply |
| CN112436488B (en) * | 2020-11-26 | 2023-05-16 | 广州金升阳科技有限公司 | Under-voltage protection circuit of DC-DC bootstrap power supply |
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