CN209313420U - A kind of family DC leakage monitoring for protection device - Google Patents
A kind of family DC leakage monitoring for protection device Download PDFInfo
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- CN209313420U CN209313420U CN201822267267.3U CN201822267267U CN209313420U CN 209313420 U CN209313420 U CN 209313420U CN 201822267267 U CN201822267267 U CN 201822267267U CN 209313420 U CN209313420 U CN 209313420U
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Abstract
The utility model discloses a kind of family DC leakage monitoring for protection devices, including processing module and the acquisition module connecting with processing module and executing agency；The acquisition module, which acquires leakage current signal and sends processing module to, carries out electric leakage judgement；Control information is sent to executing agency and carries out power-off and alert process by the processing module；It further include for providing the power module of supply input, the supply port connection of the power module and processing module for device.The present apparatus can solve the problems, such as DC leakage current monitoring accuracy, can measure microampere order leakage current.
Description
Technical field
The utility model relates to a kind of family DC leakage monitoring for protection devices, belong to electric power protection field.
Background technique
Mesolow family photovoltaic power generation DC intelligent building system is characterized in its structure of current supply network with DC distribution net
Based on, if DC power anode or cathode occur the DC distribution net for route because insulation ag(e)ing can leak electricity at runtime, this
Shi Bixu is quickly alerted or is tripped, to prevent the generation of the person or fire incident.
For the purpose of existing family is mainly used for alternating current electric leakage monitoring with earth leakage protective device, but ac leakage electric current and direct current
Leakage current has bigger difference, the influence of DC leakage current no line-to-ground distribution capacity compared with ac leakage stream, direct current
Leakage current is smaller, it is desirable that detection accuracy is higher.
Furthermore traditional family uses earth leakage protective device to be all made of 220V alternating current as monitoring device power supply, in family direct current system
In directly to will lead to protector work with this family with ac leakage protector abnormal or because power supply voltage range difference causes to leak
Current monitoring error becomes larger.The present apparatus monitors leakage current using high-precision Zero flux Hall sensor and 24 bit AD sample chips,
It can solve the problems, such as DC leakage current monitoring accuracy, can measure microampere order leakage current.In addition the present apparatus uses wide scope two-way DC/DC
Power sources in parallel power supply, is applicable in 48V~600V in the direct current system of family.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of family DC leakage monitoring for protection device, the devices
Leakage current is monitored using high-precision Zero flux Hall sensor and 24 bit AD sample chips, DC leakage current monitoring accuracy can be solved
Problem can measure microampere order leakage current, and in addition the present apparatus is powered using wide scope two-way DC/DC power sources in parallel, be applicable to 48V
In the direct current system of the family~600V.
In order to solve the above technical problems, the technology employed by the present utility model is
A kind of family DC leakage monitoring for protection device, including processing module and the acquisition module being connect with processing module
And executing agency；The acquisition module, which acquires leakage current signal and sends processing module to, carries out electric leakage judgement；The processing
Control information is sent to executing agency and carries out power-off and alert process by module；It further include for providing supply input for device
The supply port of power module, the power module and processing module connects.
Wherein, the processing module includes ADUCM363 control chip and controls the sampling that chip is connect with ADUCM363
Circuit；The sample circuit includes 24 AD conversion chips, and the input terminal of the AD conversion chip is connect with the acquisition module,
The output end of AD conversion chip controls chip with ADUCM363 by internal bus and connect；Processing module further includes for exporting control
The GPO interface circuit of signal processed, the ADUCM363 control chip are connect by GPIO interface circuit with executing agency.
Wherein, the power module includes two power supply DC/DC modules parallel with one another, the power supply DC/DC module point
It is connect simultaneously with the processing module supply port after other series diode, the power supply DC/DC module input is separately connected
External high pressure supply input and low-voltage power supply input.
Wherein, the power supply DC/DC module includes sequentially connected BMC filter circuit, switching circuit and rectifying and wave-filtering electricity
Road, the alternating supply voltage of input carries out voltage conversion by switching circuit after BMC filter circuit is filtered, finally by whole
Stream filter circuit forms average anode current after carrying out rectifying and wave-filtering.
Wherein, the switching circuit includes transformer circuit and the control electricity for controlling transformer output voltage size
Road, the control circuit include UC3844 coremaking piece and transistor, and transistor is connect with transformer inputs midpoint；It is described
UC3844 control chip generates the working condition of pwm signal control transistor to control the output voltage of transformer；The switching
Circuit further includes the feed circuit for feeding back direct current output information number, and the UC3844 control chip passes through optocoupler and feedback electricity
The connection of road output end.
Wherein, the executing agency includes power relay and the breaker and sound-light alarm that connect with power relay
Device, power relay controlled end are connect by cable with processing module.
Wherein, the acquisition module includes Hall current sensor, and the Hall current sensor is placed in slowdown monitoring circuit to be checked
In and connected by the input terminal of signal cable and AD conversion chip.
Compared with the prior art, technical solutions of the utility model have the beneficial effect that
The utility model monitors leakage current using high-precision Zero flux Hall sensor and 24 bit AD sample chips, can solve
DC leakage current monitoring accuracy problem, can measure microampere order leakage current, and measurement accuracy is high.In addition the present apparatus uses wide scope two-way
DC/DC power module parallel operation is applicable in 48V~600V in the direct current system of family, applied widely.Present apparatus DC/
DC power module controls chip controls output signal using UC3844, has the characteristics that voltage output is stable, circuit structure is simple.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model family DC leakage monitoring for protection device；
Fig. 2 is the utility model family DC leakage monitoring for protection installation's power source modular structure schematic diagram；
Fig. 3 is the utility model family DC leakage monitoring for protection device power supply DC/DC module circuit diagram；
Fig. 4 is the utility model family DC leakage monitoring for protection device work flow diagram.
Specific embodiment
According to following embodiments, the utility model may be better understood.However, those skilled in the art is easy reason
It solves, content described in embodiment is merely to illustrate the utility model, detailed without that should will not limit institute in claims
The utility model carefully described.
As shown in figures 1-4, a kind of family DC leakage monitoring for protection device, including processing module 1 and and processing module
The acquisition module of 1 connection and executing agency.Acquisition module, which acquires leakage current signal and sends processing module 1 to and leak electricity, to be sentenced
It is disconnected.Control information is sent to executing agency and carries out power-off and alert process by processing module 1.
Device further includes for providing the power module of supply input, the power supply of power module and processing module 1 for device
Port connection.Power module can connect external high voltage supply port or low-voltage power supply port, voltage and be applicable to 48V~600V
Range.
Executing agency includes power relay 3 and the breaker connecting with power relay 34 and combined aural and visual alarm 5.Function
4 controlled end of rate relay is connect by cable with processing module 1.Breaker 4 is mounted in shielded power supply system circuit.Function
Rate relay 3 is subject to processing the control of module 1, and when being determined as system electric leakage, control power relay 3 works, and power relay 3 is
Breaker 4 and combined aural and visual alarm 5 power on, and breaker 4 is to the power-off of shielded power supply system while combined aural and visual alarm 5 at this time
Issue sound-light alarm.
Acquisition module includes Hall current sensor 6, and Hall current sensor is placed in slowdown monitoring circuit to be checked and passes through signal
Cable and the input terminal of AD conversion chip connect.
Processing module 1 includes ADUCM363 control chip and controls the sample circuit that chip is connect with ADUCM363.It adopts
Sample circuit includes 24 AD conversion chips, and the input terminal of AD conversion chip is connect with acquisition module.The output end of AD conversion chip
Chip is controlled with ADUCM363 by internal bus to connect.Processing module 1 further includes the GPO interface electricity for exporting control signal
Road.ADUCM363 control chip is connect by GPIO interface circuit with executing agency.ADUCM363 control chip is also connected with use
In the SRAM module and FLASH module of storage and for the SPI interface and UART interface module with external device communication.
Electric leakage signal in slowdown monitoring circuit to be checked is converted to voltage signal and exports by Hall current sensor 6 gives AD conversion core
Piece, AD conversion chip convert analog signals into digital signal and are transferred to ADUCM363 control chip processing by internal bus.
Power module includes two power supply DC/DC modules 2 parallel with one another.DC/DC module 2 of powering distinguishes series diode
It is connect simultaneously with 1 supply port of processing module after 21.Power supply 2 input terminal of DC/DC module is separately connected external high pressure supply input
It is inputted with low-voltage power supply, application of the device under different electric power thus supplieds can be met, extend device electricity consumption range.
DC/DC module 2 of powering includes sequentially connected BMC filter circuit, switching circuit and current rectifying and wave filtering circuit.Input
Alternating supply voltage carries out voltage conversion by switching circuit after BMC filter circuit is filtered, finally by rectifying and wave-filtering electricity
Road forms average anode current after carrying out rectifying and wave-filtering.It exports electric current on the one hand to power to processing module, on the other hand also simultaneously
It powers to power relay.
BMC filter circuit is filtered the voltage of input using inductance Fuse1 and capacitor C4.Current rectifying and wave filtering circuit uses
Standard lc circuit is filtered, and AC signal is converted to the output of direct current 5V signal.
Switching circuit includes transformer circuit and the control circuit for controlling transformer output voltage size, control circuit
Including UC3844 coremaking piece and transistor Q1, transistor Q1 is connect with transformer T1 input midpoint.When switching circuit works,
UC3844 controls chip and generates pwm signal, the working condition of transistor Q1 is controlled by pwm signal, to control transformer
The output voltage of T1, meets power demands.It further include the feed circuit for feeding back direct current output information number in switching circuit,
UC3844 control chip is connect by optocoupler U2 with feedback circuit output.The output signal of feed circuit acquisition DC output end
And the conducting of optocoupler U2 is controlled, optocoupler U2 output end connects the COMP pin of UC3844 control chip.Feed circuit passes through pressure stabilizing
Pipe T1 ensure that the steady operation of optocoupler U2.Wherein optocoupler U2 model PC817, voltage-stabiliser tube T1 model use TL431.
Working-flow as shown in figure 4, ADUCM363 control chip clocked flip A/D chip leakage current is sampled,
Be judged to leaking electricity generation when the leakage current continuously sampled three times is greater than given threshold, and the chip of ADUCM363 control at this time passes through function
Rate relay 3 triggers breaker 4 and combined aural and visual alarm 5 works, and has the function that open circuit protection and sound-light alarm.
Claims (7)
1. a kind of family DC leakage monitoring for protection device, it is characterised in that: connect including processing module and with processing module
Acquisition module and executing agency；The acquisition module, which acquires leakage current signal and sends processing module to and leak electricity, to be sentenced
It is disconnected；Control information is sent to executing agency and carries out power-off and alert process by the processing module；It further include for being mentioned for device
For the power module of supply input, the supply port of the power module and processing module is connected.
2. family according to claim 1 DC leakage monitoring for protection device, it is characterised in that: the processing module includes
ADUCM363 control chip and the sample circuit being connect with ADUCM363 control chip；The sample circuit includes that 24 AD turn
Chip is changed, the input terminal of the AD conversion chip is connect with the acquisition module, and the output end of AD conversion chip passes through internal total
Line is connect with ADUCM363 control chip；Processing module further includes the GPO interface circuit for exporting control signal, described
ADUCM363 control chip is connect by GPIO interface circuit with executing agency.
3. family according to claim 1 DC leakage monitoring for protection device, it is characterised in that: the power module includes
Two power supply DC/DC modules parallel with one another, after power supply DC/DC module difference series diode simultaneously with the processing mould
The connection of block supply port, the power supply DC/DC module input are separately connected external high pressure supply input and low-voltage power supply input.
4. family according to claim 3 DC leakage monitoring for protection device, it is characterised in that: the power supply DC/DC mould
Block includes sequentially connected BMC filter circuit, switching circuit and current rectifying and wave filtering circuit, and the alternating supply voltage of input passes through BMC
Filter circuit be filtered after by switching circuit carry out voltage conversion, finally by current rectifying and wave filtering circuit carry out rectifying and wave-filtering after formed
Average anode current.
5. family according to claim 4 DC leakage monitoring for protection device, it is characterised in that: the switching circuit includes
Transformer circuit and control circuit for controlling transformer output voltage size, the control circuit includes UC3844 coremaking piece
And transistor, transistor are connect with transformer inputs midpoint；The UC3844 control chip generates pwm signal and controls transistor
Working condition control the output voltage of transformer；The switching circuit further includes for feeding back the anti-of direct current output information number
Current feed circuit, the UC3844 control chip are connect by optocoupler with feedback circuit output.
6. family according to claim 1 DC leakage monitoring for protection device, it is characterised in that: the executing agency includes
Power relay and the breaker and combined aural and visual alarm being connect with power relay, power relay controlled end by cable with
Processing module connection.
7. family according to claim 2 DC leakage monitoring for protection device, it is characterised in that: the acquisition module includes
Hall current sensor, the Hall current sensor are placed in slowdown monitoring circuit to be checked and by signal cable and AD conversion chips
Input terminal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822267267.3U CN209313420U (en) | 2018-12-29 | 2018-12-29 | A kind of family DC leakage monitoring for protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822267267.3U CN209313420U (en) | 2018-12-29 | 2018-12-29 | A kind of family DC leakage monitoring for protection device |
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| CN209313420U true CN209313420U (en) | 2019-08-27 |
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| CN201822267267.3U Active CN209313420U (en) | 2018-12-29 | 2018-12-29 | A kind of family DC leakage monitoring for protection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854827A (en) * | 2019-10-25 | 2020-02-28 | 深圳供电局有限公司 | Protection system of direct current residual current circuit breaker |
| CN111487560A (en) * | 2020-04-29 | 2020-08-04 | 南京国臣直流配电科技有限公司 | Direct current leakage protection method |
| CN111830337A (en) * | 2020-06-02 | 2020-10-27 | 联合汽车电子有限公司 | Electric leakage detection method and electric leakage detection system |
| CN111856119A (en) * | 2020-08-24 | 2020-10-30 | 上海煜闻电子科技有限公司 | Leakage current detection device and detection method |
-
2018
- 2018-12-29 CN CN201822267267.3U patent/CN209313420U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110854827A (en) * | 2019-10-25 | 2020-02-28 | 深圳供电局有限公司 | Protection system of direct current residual current circuit breaker |
| CN110854827B (en) * | 2019-10-25 | 2022-03-08 | 深圳供电局有限公司 | Protection system of direct current residual current circuit breaker |
| CN111487560A (en) * | 2020-04-29 | 2020-08-04 | 南京国臣直流配电科技有限公司 | Direct current leakage protection method |
| CN111487560B (en) * | 2020-04-29 | 2022-07-12 | 南京国臣直流配电科技有限公司 | Direct current leakage protection method |
| CN111830337A (en) * | 2020-06-02 | 2020-10-27 | 联合汽车电子有限公司 | Electric leakage detection method and electric leakage detection system |
| CN111856119A (en) * | 2020-08-24 | 2020-10-30 | 上海煜闻电子科技有限公司 | Leakage current detection device and detection method |
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