CN208902787U - A kind of instantaneous residual voltage detection circuit that parameter can be set - Google Patents
A kind of instantaneous residual voltage detection circuit that parameter can be set Download PDFInfo
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- CN208902787U CN208902787U CN201821051034.3U CN201821051034U CN208902787U CN 208902787 U CN208902787 U CN 208902787U CN 201821051034 U CN201821051034 U CN 201821051034U CN 208902787 U CN208902787 U CN 208902787U
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Abstract
The utility model proposes the instantaneous residual voltage detection circuits that a kind of parameter can be set, the instantaneous residual voltage detection circuit includes electric power management circuit, voltage collection circuit and control circuit, electric power management circuit connects input power, it powers for rear class voltage collection circuit and control circuit, the output voltage of voltage collection circuit connection electric power management circuit, after the lifting of output voltage relative datum voltage, output to control circuit, control circuit by the voltage value of acquisition compared with preset value after provide comparison result.Using the detection circuit, the parameters such as voltage, time of instantaneous residual voltage detection function can receive to obtain from outer CPU, can adapt to the different parameters of different use sites, the different running method of same use site when detecting, and flexibility is preferable.Since there are higher threshold values to be correspondingly improved the success rate of feeder automation Fault Isolation so the present apparatus is able to detect that residual voltage value more lower than relay scheme for the movement of relay.
Description
Technical field
The utility model belongs to Distribution Automation Technology field, and in particular to a kind of instantaneous residual voltage that parameter can be set detection electricity
Road.
Background technique
At present at home in distribution automation field, FEEDER AUTOMATION development is very fast, in coincidence mode on the spot
Feeder automation among, distribution terminal realizes reversed closing locking by detecting instantaneous residual voltage, this function is particularly critical.It is existing
By designing instantaneous residual voltage detection circuit as core devices using magnetic latching relay in technology, when " false voltage " occurs in route
When, magnetic latching relay movement, to record fault message, next after the power supply of non-faulting side, distribution terminal passes through inspection
The closed state of the relay is surveyed to decide whether that locking is closed a floodgate, realizes the isolation of fault zone.The existing technology is leaned on completely
By independent hardware, the different parameters of different use sites, the different running method of same use site, flexibility can not be adapted to
It is poor.
Utility model content
Purpose of utility model: in view of the deficiencies of the prior art, the utility model proposes the instantaneous residual voltages that a kind of parameter can be set
Detection circuit is capable of providing the function of the parameters flexible settings such as voltage, the time of instantaneous residual voltage detection function, meets different uses
The demand of the different running method of live different parameters, same use site.
Technical solution: a kind of instantaneous residual voltage detection circuit that parameter can be set, including electric power management circuit, voltage acquisition electricity
Road, control circuit, electric power management circuit connect input power, are that rear class voltage collection circuit and control circuit are powered, voltage is adopted
Collector connects the output voltage of electric power management circuit, after the lifting of output voltage relative datum voltage, output to control circuit,
Control circuit by the voltage value of acquisition compared with preset value after provide comparison result.
The electric power management circuit includes power backup circuit and BOOST circuit, and the power backup circuit is using super
Capacitor obtains charging source from input power, and provides power supply source for rear class BOOST circuit, and the power backup circuit includes
Super capacitor, first resistor R1, first diode D1, the second diode D2, third diode D3, voltage-stabiliser tube, input power string
It is connected to super capacitor after connection first resistor R1 and first diode D1, voltage-stabiliser tube is parallel with the super capacitor, and super capacitor is just
Pole connects and is used as VBOOST after the second diode D2, powers for rear class BOOST circuit, input power is connected third diode simultaneously
VBOOST is connected to after D3；The BOOST circuit includes step-up DC-DC chip, is connected to VBOOST.
Preferably, the first diode D1, the second diode D2, third diode D3 are low pressure drop diode
SS12。
Preferably, the voltage-stabiliser tube model TL431AIDBZR.
Preferably, the step-up DC-DC chip is MAX17222ELT+.
The voltage collection circuit includes reference voltage circuit and booster circuit, and the reference voltage circuit includes the second electricity
Resistance R2,3rd resistor R3, first voltage follow circuit VF1, and the output voltage of electric power management circuit connects after second resistance R2
It is connected to first voltage and follows circuit VF1, first voltage follows circuit VF1 in parallel with 3rd resistor R3, outputting reference voltage VREF；
The booster circuit includes that second voltage follows circuit VF2, tertiary voltage to follow circuit VF3, is separately connected premenstrual
Hold 2 road AC signal U1 and U3 of alternating voltage pretreatment circuit output, the stable AC signal of output impedance.
Preferably, the first voltage follows circuit VF1, second voltage that circuit VF2, tertiary voltage is followed to follow circuit
The amplifier chip that VF3 is used is LMV358IDR.
The control circuit uses low-power scm, mating 32.758kHz crystal oscillator.
Preferably, the single-chip microcontroller model STM32L011D3P6 has 2 road ADC sampling.
The utility model has the advantages that compared with prior art, the utility model has the following beneficial effects:
Instantaneous residual voltage detection circuit provided by the utility model, the parameters such as voltage, time of instantaneous residual voltage detection function can
The different parameters of different use sites, same use site by receiving to obtain from external host CPU, can be adapted in the detection
Different running method, flexibility is preferable.Since there are higher threshold values for the movement of relay, so the present apparatus is able to detect that
Residual voltage value more lower than relay scheme, is correspondingly improved the success rate of feeder automation Fault Isolation.
Detailed description of the invention
Fig. 1 is the instantaneous residual voltage detection circuit structure diagram according to the utility model embodiment.
Specific embodiment
The technical solution of the utility model is described further with reference to the accompanying drawing.
The instantaneous residual voltage detection circuitry provided by the utility model that function can be set with parameter as shown in figure 1
Schematic diagram mainly includes electric power management circuit, voltage collection circuit and control circuit.Electric power management circuit needs to adopt for voltage
Collector, control circuit provide reliable and stable DC3.3V power supply, and control circuit is used for the electricity of collection voltages Acquisition Circuit output
Pressure signal and compared with preset value after provide comparison result.Three electrical combinations were completed jointly together to the wink on distribution line
When the function that is measured in real time of residual voltage failure.
Electric power management circuit includes backup power supply charge-discharge circuit, BOOST circuit.
It is the super capacitor of 25F/2.7V as backup power supply that backup power supply charge-discharge circuit, which uses capacity,；In input power
Connect 30 Ω/0.5W current-limiting resistance R1 and the first low pressure drop diode D1 after DC3.3V, provides charging source for super capacitor；And
Connection 2.5V voltage-stabiliser tube prevents from overcharging to protect super capacitor；Make after the second low pressure drop diode D2 of super capacitor anode series connection
For the power supply source of rear class BOOST circuit, it is defined as VBOOST；In addition, to guarantee in input power DC3.3V normal power supply,
Super capacitor electricity is not lost, the third low pressure drop diode D3 that connects is followed by simultaneously in input power DC3.3V rear class
VBOOST。
Preferably, low pressure drop diode model SS12, voltage-stabiliser tube model TL431AIDBZR.
BOOST circuit: become stable DC3.3V through step-up DC-DC chip after VBOOST power supply, be defined as VBST_
33, it is supplied to rear class voltage collection circuit and control circuit.
Preferably, step-up DC-DC chip is MAX17222ELT+.
Voltage collection circuit includes reference voltage circuit, lifting circuit.
Reference voltage circuit: VBST_33 is through 330K Ω/0.1W second resistance R2 and 200K Ω/0.1W 3rd resistor R3 points
Pressure, to obtain the benchmark of about 1.245V at the both ends 200K Ω, then using amplifier voltage follower circuit VF1, finally obtains
The stable 1.245V of output impedance, is defined as VREF, the lifting reference voltage as AC signal.
Preferably, the amplifier chip that amplifier voltage follower circuit uses is LMV358IDR.
Be lifted circuit: lifting circuit includes 1 reference voltage chip and 2 voltage followers.Since distribution line is
10kV voltage class, so front end AC voltage pretreatment circuit (being not shown on figure) is needed to be converted to 10kV within 1.245V
Small signal.Limited by single-chip microcontroller sampled voltage grade, lifting circuit requirement input 2 road AC signal amplitudes all-
Between 1.245V~+1.245V, it is respectively defined as U1, U3, common end is shorted, and is defined as Ur；After Ur is connect with VREF, relatively
It has been lifted to 0V or more in GND, U1, U3, then using amplifier voltage follower circuit VF2 and VF3, has been finally obtained defeated
The AC signal that can be acquired by control circuit of impedance stabilization out.
Control circuit selects low-power scm as CPU, mating 32.758kHz crystal oscillator.
Preferably, single-chip microcontroller model STM32L011D3P6 has 2 road ADC sampling.Single-chip microcontroller is by 2 road voltages of acquisition
Value provides comparison result after being compared with preset value, this can be completed using the comparator in single-chip microcontroller, without being calculated.
Preset value can be received from external host CPU and be obtained.
It is emphasized that embodiment described above be it is illustrative, without being restrictive, therefore the utility model
It is all by those skilled in the art's skill according to the present utility model including being not limited to embodiment described in specific embodiment
The other embodiments that art scheme obtains also belong to the range of the utility model protection.
Claims (9)
1. the instantaneous residual voltage detection circuit that a kind of parameter can be set, which is characterized in that including electric power management circuit, voltage acquisition electricity
Road, control circuit, electric power management circuit connect input power, are that rear class voltage collection circuit and control circuit are powered, voltage is adopted
Collector connects the output voltage of electric power management circuit, after the lifting of output voltage relative datum voltage, output to control circuit,
Control circuit by the voltage value of acquisition compared with preset value after provide comparison result.
2. instantaneous residual voltage detection circuit according to claim 1, which is characterized in that the electric power management circuit includes standby
Power circuit and BOOST circuit, the power backup circuit obtain charging source from input power using super capacitor, and after being
Grade BOOST circuit provides power supply source, wherein
The power backup circuit includes super capacitor, first resistor R1, first diode D1, the second diode D2, the three or two
Pole pipe D3, voltage-stabiliser tube are connected to super capacitor after input power series connection first resistor R1 and first diode D1, voltage-stabiliser tube and super
Grade capacitor is in parallel, is used as VBOOST after the second diode D2 of anode series connection of super capacitor, powers for rear class BOOST circuit, defeated
Enter power supply while being connected to VBOOST after the third diode D3 that connects；
The BOOST circuit includes step-up DC-DC chip, is connected to VBOOST.
3. instantaneous residual voltage detection circuit according to claim 2, which is characterized in that the first diode D1, the two or two
Pole pipe D2, third diode D3 are low pressure drop diode SS12.
4. instantaneous residual voltage detection circuit according to claim 2, which is characterized in that the voltage-stabiliser tube model
TL431AIDBZR。
5. instantaneous residual voltage detection circuit according to claim 2, which is characterized in that the step-up DC-DC chip is
MAX17222ELT+。
6. instantaneous residual voltage detection circuit according to claim 1, which is characterized in that the voltage collection circuit includes benchmark
Potential circuit and booster circuit, the reference voltage circuit include that second resistance R2,3rd resistor R3, first voltage follow circuit
VF1, the output voltage of electric power management circuit are connected to first voltage after second resistance R2 and follow circuit VF1, first voltage
Follow circuit VF1 in parallel with 3rd resistor R3, outputting reference voltage VREF；
The booster circuit includes that second voltage follows circuit VF2, tertiary voltage to follow circuit VF3, is separately connected and hands over through front end
2 road AC signal U1 and U3 of galvanic electricity pressure pretreatment circuit output, the stable AC signal of output impedance.
7. instantaneous residual voltage detection circuit according to claim 6, which is characterized in that the first voltage follow circuit VF1,
The amplifier chip that second voltage follows circuit VF2, tertiary voltage that circuit VF3 is followed to use is LMV358IDR.
8. instantaneous residual voltage detection circuit described in any one of -7 according to claim 1, which is characterized in that the control circuit
Using low-power scm, mating 32.758kHz crystal oscillator.
9. instantaneous residual voltage detection circuit according to claim 8, which is characterized in that the single-chip microcontroller model
STM32L011D3P6 has 2 road ADC sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821051034.3U CN208902787U (en) | 2018-07-03 | 2018-07-03 | A kind of instantaneous residual voltage detection circuit that parameter can be set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821051034.3U CN208902787U (en) | 2018-07-03 | 2018-07-03 | A kind of instantaneous residual voltage detection circuit that parameter can be set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208902787U true CN208902787U (en) | 2019-05-24 |
Family
ID=66567083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821051034.3U Active CN208902787U (en) | 2018-07-03 | 2018-07-03 | A kind of instantaneous residual voltage detection circuit that parameter can be set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208902787U (en) |
-
2018
- 2018-07-03 CN CN201821051034.3U patent/CN208902787U/en active Active
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