CN103364628A - Residual current signal conditioning circuit - Google Patents
Residual current signal conditioning circuit Download PDFInfo
- Publication number
- CN103364628A CN103364628A CN2013102956250A CN201310295625A CN103364628A CN 103364628 A CN103364628 A CN 103364628A CN 2013102956250 A CN2013102956250 A CN 2013102956250A CN 201310295625 A CN201310295625 A CN 201310295625A CN 103364628 A CN103364628 A CN 103364628A
- Authority
- CN
- China
- Prior art keywords
- residual current
- unit
- conditioning circuit
- power supply
- signal conditioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to a residual current signal conditioning circuit. The residual current signal conditioning circuit comprises a power source signal zero-cross detection unit, a residual current signal detection unit and a micro controller unit, wherein the residual current signal detection unit and the power source signal zero-cross detection unit are connected with the MCU. The residual current signal conditioning circuit can accurately and reliably detect a total value of residual current, can reliably and effectively recognize on which one of a phase A, a phase B and a phase C the residual current occurs, has the function of phase recognition, greatly reduces workload of maintainers, improves working efficiency, reduces the time of a blackout, meets the requirement of a user for the continuity of power supply, is simple in design of an electronic circuit and good in electromagnetic compatibility performance, and meets the actual requirements of clients.
Description
Technical field
The present invention relates to a kind of signal conditioning circuit, more particularly, relate to a kind of residual current signal conditioning circuit.
Background technology
Along with the fast development of China's industry and covil construction, and more and more higher to the requirement for safe distribution of electric power, and residual current action breaker obtains general promotion and application.In the prior art, the residual current signal conditioning circuit of residual current action breaker can only be identified total residual electricity flow valuve, can not identify residual current and specifically occur in which phase among A, B, the C.Because it is single-phase that residual current usually occurs in, in case occuring, the residual current fault causes large-area power-cuts.Need to investigate simultaneously A, B, C three-phase during maintenance, the workload, the while efficient that have greatly increased the maintainer are low, and the time that causes power failure is long, affects the successional requirement of customer power supply.Particularly long owing to circuit in rural power grids, to use electrodispersion, and be distributed in the mountain area more, maintenance workload is larger, efficient is lower, more affects the user to the requirement of power supply continuity.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art above-mentioned can't differentiate concrete which break down mutually and cause maintainer's workload large, efficient is low, power off time is long and affect the successional defective of customer power supply, a kind of residual current signal conditioning circuit is provided, comprises:
Power supply signal zero passage detection unit;
The residual current detecting signal unit;
Micro controller unit MCU;
Wherein, described residual current detecting signal unit all is connected with described micro controller unit MCU with described power supply signal zero passage detection unit.
Further, described power supply signal zero passage detection unit is by transformer T1, resistance R 1, R2, R3, voltage stabilizing diode D1 and operational amplifier U1A form, its output terminal and the input and output IN/OUT module with interrupt function connect, and input end can choose at random mutually power supply of UA and UN, UB and UN, UC and UN any.
Further, described micro controller unit MCU comprises analog-to-digital conversion module, timer module and the input and output IN/OUT module with interrupt function.
Further, described residual current detecting signal unit comprises residual current amplifying unit, residual current precision rectifying unit and residual current zero passage recognition unit.
Further; described residual current amplifying unit is connected across between the output terminal VIN and GND of zero sequence current mutual inductor by sampling resistor R1; diode D1, D2 form the differential mode voltage holding circuit; itself and resistance R 1 are connected in parallel; resistance R 2, R4 form the gain of residual current amplifying unit; one end of resistance R 3 is connected in-phase input end and is connected with operational amplifier U1A, its other end is connected negative electrode and is connected capacitor C 1 and resistance R 4 parallel connections with diode D2.
Further, described residual current precision rectifying unit is by resistance R 5, R6, R7, R8, R9, R10, diode D3, D4, D5, D6 and operational amplifier U1B, U1C form, and its output terminals A D1 is connected analog-to-digital conversion module and is connected the measurements and calculations of finishing the residual current effective value with micro controller unit MCU.
Further, described residual current zero passage recognition unit is by operational amplifier U1D, and resistance R 11, R12, filter capacitor C2 and transistor Q1, its output terminal are connected the input/output module IN/OUT with interrupt function and are connected with micro controller unit MCU.
Further, the output signal of described power supply signal zero passage detection unit is the reference square wave signal of power supply voltage; The output signal of described residual current zero passage recognition unit is the square-wave signal of residual current.
Implement a kind of residual current signal conditioning circuit of the present invention, has following beneficial effect: not only can accurately detect reliably total residual electricity flow valuve, and can reliably effectively identify which phase in A, B, C that residual current occurs, has the phase identification function, greatly reduced maintainer's workload, increase work efficiency, reduced simultaneously power off time, satisfy the successional requirement of customer power supply, electronic circuitry design is simple simultaneously, the electromagnetic compatibility characteristic is strong, more meets client's actual demand.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is residual current signal conditioning circuit schematic diagram in the prior art;
Fig. 2 residual current signal conditioning circuit of the present invention theory diagram;
Fig. 3 residual current detecting signal unit of the present invention circuit theory diagrams;
Fig. 4 power supply signal zero passage detection of the present invention element circuit schematic diagram;
Fig. 5 is the output waveform synoptic diagram of the present invention's electricity residual current detecting signal unit;
Fig. 6 is residual current signal phase recognition principle figure of the present invention.
Embodiment
See also Fig. 1, for being residual current signal conditioning circuit schematic diagram in the prior art.
See also Fig. 2, be residual current signal conditioning circuit theory diagram of the present invention.As shown in Figure 2, residual current signal conditioning circuit of the present invention comprises: power supply signal zero passage detection unit; The residual current detecting signal unit; Micro controller unit MCU; Wherein, described residual current detecting signal unit all is connected with described micro controller unit MCU with described power supply signal zero passage detection unit.Micro controller unit comprises analog-to-digital conversion module, timer module and the input and output IN/OUT module composition with interrupt function.
See also Fig. 3, be residual current detecting signal unit circuit theory diagrams of the present invention.As shown in Figure 3, the residual current amplifying unit is connected across between the output terminal VIN and GND of zero sequence current mutual inductor by sampling resistor R1, diode D1, D2 form the differential mode voltage holding circuit, itself and resistance R 1 are connected in parallel, resistance R 2, R4 form the gain of residual current amplifying unit, one end of resistance R 3 is connected in-phase input end and is connected with operational amplifier U1A, its other end is connected negative electrode and is connected capacitor C 1 and resistance R 4 parallel connections with diode D2; Residual current precision rectifying unit is by resistance R 5, R6, R7, R8, R9, R10, diode D3, D4, D5, D6 and operational amplifier U1B, U1C form, and its output terminals A D1 is connected MCU with micro controller unit) analog-to-digital conversion module connect the measurements and calculations of finishing the residual current effective value; Residual current zero passage recognition unit is by operational amplifier U1D, and resistance R 11, R12, filter capacitor C2 and transistor Q1, its output terminal are connected MCU with micro controller unit) the input/output module IN/OUT with interrupt function connect.
See also Fig. 4, be power supply signal zero passage detection element circuit schematic diagram of the present invention.As shown in Figure 4, power supply signal zero passage detection unit is by transformer T1, resistance R 1, R2, R3, voltage stabilizing diode D1 and operational amplifier U1A form, its output terminal and the input and output IN/OUT module with interrupt function connect, and input end can choose at random mutually power supply of UA and UN, UB and UN, UC and UN any.
See also Fig. 5, be the output waveform synoptic diagram of the present invention's electricity residual current detecting signal unit.As shown in Figure 5, finish the detection of zero crossing by residual current zero passage recognition unit, begin to sample and calculate the effective value of residual current by zero crossing, guarantee the accuracy of residual current measurements and calculations; Micro controller unit MCU has the input and output IN/OUT module of interrupt function, comprise for the first input/output terminal IN/OUT that receives power supply signal zero passage detection unit with for the second input/output terminal IN/OUT that receives residual current zero passage recognition unit, the output signal of described reception power supply signal zero passage detection unit is the reference square wave signal of power supply voltage, and the output signal of described residual current zero passage recognition unit is the square-wave signal of residual current; Timer module is finished reference square wave and the rising edge of the square-wave signal that described the second input/output terminal IN/OUT receives described residual current or the mistiming of negative edge that described the first input/output terminal IN/OUT of record receives described power supply voltage.
See also Fig. 6, be residual current signal phase recognition principle figure of the present invention.As shown in Figure 6, calculate by formula φ=2 π t/T.T is power frequency period, and t is that the output of power supply signal zero passage detection unit starts timing and the output of residual current zero passage recognition unit stops timing.
By adopting the present invention, has following beneficial effect: one, accurately detect reliably total residual electricity flow valuve; Two, reliably effectively identify which phase in A, B, C that residual current occurs, have the phase identification function; Three, greatly reduce maintainer's workload, increased work efficiency, reduced simultaneously power off time, satisfied the successional requirement of customer power supply; Four, electronic circuitry design is simple, the electromagnetic compatibility characteristic is strong, meets client's actual demand.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion of the technology of the present invention, can carry out many modifications and not break away from its protection domain the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection domain.
Claims (8)
1. a residual current signal conditioning circuit is characterized in that, comprises power supply voltage input VIN, it is characterized in that, also comprises:
Power supply signal zero passage detection unit;
The residual current detecting signal unit;
Micro controller unit MCU;
Wherein, described residual current detecting signal unit all is connected with described micro controller unit MCU with described power supply signal zero passage detection unit.
2. a kind of residual current signal conditioning circuit according to claim 1, it is characterized in that, described power supply signal zero passage detection unit is by transformer T1, resistance R 1, R2, R3, voltage stabilizing diode D1 and operational amplifier U1A form, its output terminal and the input and output IN/OUT module with interrupt function connect, and input end can choose at random mutually power supply of UA and UN, UB and UN, UC and UN any.
3. a kind of residual current signal conditioning circuit according to claim 1 is characterized in that, described micro controller unit MCU comprises analog-to-digital conversion module, timer module and the input and output IN/OUT module with interrupt function.
4. a kind of residual current signal conditioning circuit according to claim 1 is characterized in that, described residual current detecting signal unit comprises residual current amplifying unit, residual current precision rectifying unit and residual current zero passage recognition unit.
5. a kind of residual current signal conditioning circuit according to claim 4; it is characterized in that; described residual current amplifying unit is connected across between the output terminal VIN and GND of zero sequence current mutual inductor by sampling resistor R1; diode D1, D2 form the differential mode voltage holding circuit; itself and resistance R 1 are connected in parallel; resistance R 2, R4 form the gain of residual current amplifying unit; one end of resistance R 3 is connected in-phase input end and is connected with operational amplifier U1A; its other end is connected negative electrode and is connected capacitor C 1 and resistance R 4 parallel connections with diode D2.
6. a kind of residual current signal conditioning circuit according to claim 4, it is characterized in that, described residual current precision rectifying unit is by resistance R 5, R6, R7, R8, R9, R10, diode D3, D4, D5, D6 and operational amplifier U1B, U1C form, and its output terminals A D1 is connected analog-to-digital conversion module and is connected the measurements and calculations of finishing the residual current effective value with micro controller unit MCU.
7. a kind of residual current signal conditioning circuit according to claim 4, it is characterized in that, described residual current zero passage recognition unit is by operational amplifier U1D, resistance R 11, R12, filter capacitor C2 and transistor Q1, its output terminal are connected the input/output module IN/OUT with interrupt function and are connected with micro controller unit MCU.
8. according to claim 1 to the described residual current signal conditioning circuit of 7 each claims, it is characterized in that the output signal of described power supply signal zero passage detection unit is the reference square wave signal of power supply voltage; The output signal of described residual current zero passage recognition unit is the square-wave signal of residual current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102956250A CN103364628A (en) | 2013-07-15 | 2013-07-15 | Residual current signal conditioning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102956250A CN103364628A (en) | 2013-07-15 | 2013-07-15 | Residual current signal conditioning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103364628A true CN103364628A (en) | 2013-10-23 |
Family
ID=49366423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102956250A Pending CN103364628A (en) | 2013-07-15 | 2013-07-15 | Residual current signal conditioning circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103364628A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182152A (en) * | 2015-08-20 | 2015-12-23 | 浙江凯发电气股份有限公司 | Electric leakage detection circuit for automatic recovery leakage protector |
| CN106033879A (en) * | 2015-03-09 | 2016-10-19 | 西门子公司 | Circuit breaking protection circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0174518A1 (en) * | 1984-08-17 | 1986-03-19 | Fuji Photo Film Co., Ltd. | Zero-cross point detecting circuit |
| WO2004019477A2 (en) * | 2002-08-26 | 2004-03-04 | International Rectifier Corporation | Input filter for a.c. motor phase current sensing |
| CN201887427U (en) * | 2010-12-22 | 2011-06-29 | 常熟开关制造有限公司(原常熟开关厂） | Residual current protection circuit breaker with communication and alarm functions |
| CN203337727U (en) * | 2013-07-15 | 2013-12-11 | 长城电器集团有限公司 | Residual current signal conditioning circuit |
-
2013
- 2013-07-15 CN CN2013102956250A patent/CN103364628A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0174518A1 (en) * | 1984-08-17 | 1986-03-19 | Fuji Photo Film Co., Ltd. | Zero-cross point detecting circuit |
| WO2004019477A2 (en) * | 2002-08-26 | 2004-03-04 | International Rectifier Corporation | Input filter for a.c. motor phase current sensing |
| CN201887427U (en) * | 2010-12-22 | 2011-06-29 | 常熟开关制造有限公司(原常熟开关厂） | Residual current protection circuit breaker with communication and alarm functions |
| CN203337727U (en) * | 2013-07-15 | 2013-12-11 | 长城电器集团有限公司 | Residual current signal conditioning circuit |
Non-Patent Citations (4)
| Title |
|---|
| 中国百科网: "《中国百科网》", 30 May 2012, article "过零检测器使用的IC311电路图" * |
| 岳大为 等: "Proteus在剩余电流动作保护器开发中的应用", 《电气制造》, no. 3, 31 December 2008 (2008-12-31), pages 80 - 83 * |
| 张冠英 等: "一种智能剩余电流检测装置的开发", 《低压电器》, no. 2, 31 December 2011 (2011-12-31), pages 28 - 31 * |
| 徐江海: "基于P87LPC767单片机的剩余电流保护器", 《中国优秀硕士学位论文全文数据库 工程科技II辑》, no. 04, 15 April 2009 (2009-04-15), pages 9 - 23 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033879A (en) * | 2015-03-09 | 2016-10-19 | 西门子公司 | Circuit breaking protection circuit |
| CN106033879B (en) * | 2015-03-09 | 2018-10-16 | 西门子公司 | Breaking protection circuit |
| CN105182152A (en) * | 2015-08-20 | 2015-12-23 | 浙江凯发电气股份有限公司 | Electric leakage detection circuit for automatic recovery leakage protector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI639293B (en) | Capacitor discharge method and discharge circuit | |
| CN206096314U (en) | Power failure detection system and electric meter system | |
| CN102412720A (en) | Switching power circuit and power factor correction (PFC) control circuit thereof | |
| CN103424606A (en) | Frequency-adaptive low-voltage power carrier communication zero-crossing detection circuit | |
| CN102707121B (en) | Voltage surge detection circuit | |
| CN103257272B (en) | A kind of communication power supply power-fail detection circuit and detection method | |
| CN102044981B (en) | Switching power supply with capacitor discharge circuit | |
| CN207675825U (en) | A kind of zero cross detection circuit | |
| CN202204866U (en) | Current detection circuit for air-conditioner compressor | |
| CN202710671U (en) | Open phase detecting circuit of three-phase power supply | |
| CN203204062U (en) | Comparator-based voltage signal detection circuit | |
| CN204731307U (en) | AC voltage detection circuit | |
| CN103364628A (en) | Residual current signal conditioning circuit | |
| CN103969498A (en) | High-power high-frequency power supply output overvoltage detection circuit | |
| CN206832896U (en) | A kind of three-phase power input phase-loss detection circuit | |
| CN108667316A (en) | Ac-input type Switching Power Supply | |
| CN203759091U (en) | Input voltage detection circuit | |
| CN102412721A (en) | Switching power circuit and power factor correction (PFC) control circuit thereof | |
| CN103051206B (en) | Fresh-keeping device power control circuit, device and control method thereof | |
| CN203337727U (en) | Residual current signal conditioning circuit | |
| CN204794736U (en) | Novel half -wave rectifier circuit | |
| CN203871274U (en) | Energy-saving resistive-capacitive step-down relay control circuit | |
| CN202353183U (en) | AC overvoltage off protection circuit | |
| CN204287447U (en) | A kind of alternating current-direct current input detecting circuit | |
| CN102769271B (en) | A kind of AC power output protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131023 |
|
| RJ01 | Rejection of invention patent application after publication |