CN112285537A - Circuit and method for self-diagnosis of main circuit of frequency converter - Google Patents
Circuit and method for self-diagnosis of main circuit of frequency converter Download PDFInfo
- Publication number
- CN112285537A CN112285537A CN202011169580.9A CN202011169580A CN112285537A CN 112285537 A CN112285537 A CN 112285537A CN 202011169580 A CN202011169580 A CN 202011169580A CN 112285537 A CN112285537 A CN 112285537A
- Authority
- CN
- China
- Prior art keywords
- main circuit
- signal
- control unit
- microprocessor control
- state
- 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.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inverter Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a circuit and a method for self-diagnosis of a main circuit of a frequency converter.A bus voltage isolation sampling unit of the frequency converter or a servo driver detects the voltages of a positive pole P end and a negative pole N end of a main circuit direct current bus, sends an equal proportion analog quantity signal VPN to a microprocessor control unit after linear isolation, and then the microprocessor control unit receives the VPN signal, judges according to the state of the VPN signal and sends a corresponding regeneration unit driving signal DRIVE. Meanwhile, the STATE detection unit detects voltages of a main circuit terminal C and a main circuit terminal B, sends a digital quantity signal STATE to the microprocessor control unit after isolation, and after the microprocessor control unit receives the STATE signal, the combined logic of the STATE signal, the VPN signal STATE and the regeneration unit driving signal DRIVE is integrated to judge the STATEs of the pre-charging resistor, the regeneration resistor and the regeneration unit, so that the self-diagnosis function is realized.
Description
The technical field is as follows:
the invention relates to a circuit and a method for self-diagnosis of a main circuit of a frequency converter.
Background art:
the pre-charging resistor, the regeneration resistor and the regeneration unit in the frequency converter and the servo driver belong to vulnerable parts, under severe working conditions and complex electromagnetic environments, the pre-charging resistor and the regeneration resistor are prone to open circuit failure, and the IGBT in the regeneration unit is prone to open circuit failure or short circuit failure. If the state of the charging resistor, the regeneration resistor and the regeneration unit cannot be well self-diagnosed before and during the operation of the frequency converter and the servo driver, if the state of the charging resistor, the regeneration resistor and the regeneration unit fails: the failure of secondary parts of a frequency converter and a servo driver can be caused; and partial functions of a frequency converter and a servo driver driving motor can be disabled, so that abnormal control conditions can occur. In severe cases, even serious loss of people's property and life may result.
At present, in most traditional schemes of frequency converters and servo drivers, a bus voltage isolation sampling unit is indispensable, and bus voltage is converted into a linear analog quantity signal after being isolated, so that a microprocessor control unit can read the current bus voltage value; there will also typically be a status detection unit: the two ends of the regeneration resistor are connected with an optocoupler detection circuit in parallel, the primary side of the optocoupler detection circuit is formed by connecting a resistor and the input end of an optocoupler diode in series, the output end of a secondary side triode is connected with a pull-up resistor to form an OC gate circuit, and when the regeneration unit works, the microprocessor control unit reads a detection signal and judges whether the regeneration resistor is open-circuited or not. This type of solution has a great limitation, and only a rough judgment of the state of the brake resistor is possible.
Therefore, the conventional technology cannot detect and diagnose the system fault of the pre-charge resistor, the regeneration resistor and the regeneration unit.
The invention content is as follows:
the present invention provides a circuit and a method for self-diagnosis of a main circuit of a frequency converter, which are used for solving the problems existing in the prior art.
The technical scheme adopted by the invention is as follows:
a circuit for self-diagnosis of a main circuit of a frequency converter comprises a main circuit, a bus voltage isolation sampling unit, a state detection unit and a microprocessor control unit, wherein the main circuit is coupled with the bus voltage isolation sampling unit, the state detection unit and the microprocessor control unit; the bus voltage isolation sampling unit is coupled with the main circuit and the microprocessor control unit; the state detection unit is coupled with the main circuit and the microprocessor control unit; the microprocessor control unit is coupled with the main circuit, the bus voltage isolation sampling unit and the state detection unit, and is characterized in that: the state detection unit comprises a resistor R1, a resistor R2 and a photoelectric coupler OP1, one end of the resistor R1 is connected with the end C in the main circuit, and the other end of the resistor R1 is connected with the anode of the photoelectric coupler OP 1; one end of the resistor R2 is connected with a power VCC, and the other end is connected with the collector of the photoelectric coupler OP 1; the cathode of the photocoupler OP1 is connected to the B terminal in the main circuit, and the emitter of the photocoupler OP1 is connected to the ground GND.
The invention also provides a method for self-diagnosis of the main circuit of the frequency converter, which comprises the following steps:
step 1): the bus voltage isolation sampling unit detects the voltages of a positive pole P end and a negative pole N end of a main circuit direct current bus, the voltages from the P end to the N end are isolated and linearly reduced by the isolation sampling unit to obtain an analog quantity signal VPN, and the bus voltage isolation sampling unit sends an equal-proportion analog quantity signal VPN to the microprocessor control unit;
step 2): the STATE detection unit detects the voltages of a C end and a B end in the main circuit, the voltage from the C end to the B end is isolated and converted by the STATE detection unit to obtain a digital quantity signal STATE, and the STATE detection unit sends the digital quantity signal STATE to the microprocessor control unit;
step 3): the microprocessor control unit receives the VPN signal in the step 1), judges according to the state of the VPN signal and sends a corresponding regeneration unit driving signal DRIVE;
step 4): the microprocessor control unit receives the STATE signal in the step 2), and judges the STATEs of the pre-charging resistor, the regeneration resistor and the regeneration unit according to the STATE signal to realize the self-diagnosis function.
Further, the VPN signal is an analog quantity signal with an amplitude ranging from 0 to VCC.
Further, the DRIVE signal is a high-level or low-level digital signal.
Further, the STATE signal is a high-level or low-level digital signal.
The invention comprises a main circuit, a bus voltage isolation sampling unit, a state detection unit and a microprocessor control unit, and compared with the traditional scheme, a new hardware circuit unit is not added. The difference lies in that: in the aspect of hardware, the position connected with an optical coupling detection circuit of the state detection unit is changed and is not connected with a regenerative resistor in parallel in the prior art; in the aspect of software, more complex combinational logic analysis is carried out through the bus voltage value, the current regeneration unit driving signal state and the detection unit signal state.
After the microprocessor control unit reads the current bus voltage value of the bus voltage isolation sampling unit, the microprocessor control unit sends a corresponding regeneration unit driving signal so as to control the regeneration unit to be switched on or switched off. Meanwhile, the microprocessor control unit reads the signal state of the detection unit and performs self-diagnosis on the states of the pre-charging resistor, the regeneration resistor and the regeneration unit by combining the current bus voltage value state and the regeneration unit driving signal state. The beneficial effects produced by the method are as follows:
1) the device of the invention can increase the state detection of the regeneration unit and the pre-charging resistor without adding extra circuits and cost;
2) the device has the advantages of simple structure, obvious effect and high reliability, and can better realize the protection effect on the frequency converter and the servo driver.
Description of the drawings:
FIG. 1 is a schematic diagram of a system architecture for a transducer and a servo driver according to the present invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the circuit for self-diagnosis of the main circuit of the frequency converter of the present invention comprises a main circuit, a bus voltage isolation sampling unit, a state detection unit and a microprocessor control unit, wherein the main circuit is coupled to the bus voltage isolation sampling unit, the state detection unit and the microprocessor control unit; the bus voltage isolation sampling unit is coupled with the main circuit and the microprocessor control unit; the state detection unit is coupled with the main circuit and the microprocessor control unit; the microprocessor control unit is coupled with the main circuit, the bus voltage isolation sampling unit and the state detection unit.
The state detection unit comprises a resistor R1, a resistor R2 and a photoelectric coupler OP1, wherein one end of the resistor R1 is connected with the end C in the main circuit, and the other end of the resistor R1 is connected with the anode of the photoelectric coupler OP 1; one end of the resistor R2 is connected with a power VCC, and the other end is connected with the collector of the photoelectric coupler OP 1; the cathode of the photocoupler OP1 is connected to the B terminal in the main circuit, and the emitter of the photocoupler OP1 is connected to the ground GND.
The bus voltage isolation sampling unit is a linear isolation circuit unit in a form of passing light, magnetism, capacitance or high resistance.
The microprocessor control unit is a circuit unit of a Microprocessor (MCU) including a Central Processing Unit (CPU), a single chip microcomputer, a Digital Signal Processor (DSP), a Programmable Logic Device (PLD) or a programmable controller (PLC).
The work implementation method of the invention is as follows:
the working implementation method of the unit comprises the following steps:
step 1): the bus voltage isolation sampling unit detects the voltages of the positive pole P end and the negative pole N end of the main circuit direct current bus, and sends an equal proportion analog quantity signal VPN to the microprocessor control unit after linear isolation;
step 2): the STATE detection unit detects the voltages of the end C and the end B of the main circuit, and sends a digital quantity signal STATE to the microprocessor control unit after the isolation;
step 3): the microprocessor control unit receives the VPN signal, judges according to the state of the VPN signal and sends a corresponding regeneration unit driving signal DRIVE;
step 4): and the microprocessor control unit receives the STATE signal, judges the STATEs of the pre-charging resistor, the regeneration resistor and the regeneration unit according to the STATE signal and realizes the self-diagnosis function.
Generally, the VPN signal is an analog signal having an amplitude ranging from 0 to VCC, the DRIVE signal is a high-level or low-level digital signal, and the STATE signal is a high-level or low-level digital signal.
The specific signal logic judgment conditions are shown in the following table:
the foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (5)
1. A circuit for self-diagnosis of a main circuit of a frequency converter comprises a main circuit, a bus voltage isolation sampling unit, a state detection unit and a microprocessor control unit, wherein the main circuit is coupled with the bus voltage isolation sampling unit, the state detection unit and the microprocessor control unit; the bus voltage isolation sampling unit is coupled with the main circuit and the microprocessor control unit; the state detection unit is coupled with the main circuit and the microprocessor control unit; the microprocessor control unit is coupled with the main circuit, the bus voltage isolation sampling unit and the state detection unit, and is characterized in that: the state detection unit comprises a resistor R1, a resistor R2 and a photoelectric coupler OP1, one end of the resistor R1 is connected with the end C in the main circuit, and the other end of the resistor R1 is connected with the anode of the photoelectric coupler OP 1; one end of the resistor R2 is connected with a power VCC, and the other end is connected with the collector of the photoelectric coupler OP 1; the cathode of the photocoupler OP1 is connected to the B terminal in the main circuit, and the emitter of the photocoupler OP1 is connected to the ground GND.
2. A method for self-diagnosis of a main circuit of a frequency converter is characterized in that: the method comprises the following steps:
step 1): the bus voltage isolation sampling unit detects the voltages of a positive pole P end and a negative pole N end of a main circuit direct current bus, the voltages from the P end to the N end are isolated and linearly reduced by the isolation sampling unit to obtain an analog quantity signal VPN, and the bus voltage isolation sampling unit sends an equal-proportion analog quantity signal VPN to the microprocessor control unit;
step 2): the STATE detection unit detects the voltages of a C end and a B end in the main circuit, the voltage from the C end to the B end is isolated and converted by the STATE detection unit to obtain a digital quantity signal STATE, and the STATE detection unit sends the digital quantity signal STATE to the microprocessor control unit;
step 3): the microprocessor control unit receives the VPN signal in the step 1), judges according to the state of the VPN signal and sends a corresponding regeneration unit driving signal DRIVE;
step 4): the microprocessor control unit receives the STATE signal in the step 2), and judges the STATEs of the pre-charging resistor, the regeneration resistor and the regeneration unit according to the STATE signal to realize the self-diagnosis function.
3. Method for self-diagnosis of a main circuit of a frequency converter according to claim 2, characterized in that: the VPN signal is an analog quantity signal with the amplitude range of 0 to VCC.
4. Method for self-diagnosis of a main circuit of a frequency converter according to claim 2, characterized in that: the DRIVE signal is a high level or low level digital quantity signal.
5. Method for self-diagnosis of a main circuit of a frequency converter according to claim 2, characterized in that: the STATE signal is a high-level or low-level digital quantity signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011169580.9A CN112285537B (en) | 2020-10-28 | 2020-10-28 | Circuit and method for self-diagnosis of main circuit of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011169580.9A CN112285537B (en) | 2020-10-28 | 2020-10-28 | Circuit and method for self-diagnosis of main circuit of frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112285537A true CN112285537A (en) | 2021-01-29 |
| CN112285537B CN112285537B (en) | 2023-03-21 |
Family
ID=74373464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011169580.9A Active CN112285537B (en) | 2020-10-28 | 2020-10-28 | Circuit and method for self-diagnosis of main circuit of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112285537B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW546909B (en) * | 2000-12-20 | 2003-08-11 | Yaskwa Denki Kabushiki Kaisha | Fault detecting circuit for brake switching element of frequency transformer and frequency transformer |
| JP2007017187A (en) * | 2005-07-05 | 2007-01-25 | Hitachi Industrial Equipment Systems Co Ltd | Phase interruption detection circuit |
| CN2935619Y (en) * | 2006-04-25 | 2007-08-15 | 深圳市中传电气技术有限公司 | Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter |
| CN102279304A (en) * | 2011-03-31 | 2011-12-14 | 欧瑞传动电气有限公司 | Direct current bus voltage detecting circuit for low voltage frequency converter |
| CN102882440A (en) * | 2012-10-27 | 2013-01-16 | 株洲变流技术国家工程研究中心有限公司 | High-power braking energy consumption device and control method thereof |
| CN105429102A (en) * | 2015-12-22 | 2016-03-23 | 南京科远驱动技术有限公司 | Protection warning method and system for frequency converter equipped with multiple motors |
| CN208937644U (en) * | 2018-08-29 | 2019-06-04 | 长沙市小为电子科技有限公司 | Braking resistor qualitative detection circuit and its frequency converter |
| CN209805706U (en) * | 2019-05-17 | 2019-12-17 | 上海英威腾工业技术有限公司 | Dynamic braking circuit for servo motor |
| CN211123210U (en) * | 2019-09-12 | 2020-07-28 | 苏州汇川技术有限公司 | Brake resistor short circuit detection circuit |
-
2020
- 2020-10-28 CN CN202011169580.9A patent/CN112285537B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW546909B (en) * | 2000-12-20 | 2003-08-11 | Yaskwa Denki Kabushiki Kaisha | Fault detecting circuit for brake switching element of frequency transformer and frequency transformer |
| JP2007017187A (en) * | 2005-07-05 | 2007-01-25 | Hitachi Industrial Equipment Systems Co Ltd | Phase interruption detection circuit |
| CN2935619Y (en) * | 2006-04-25 | 2007-08-15 | 深圳市中传电气技术有限公司 | Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter |
| CN102279304A (en) * | 2011-03-31 | 2011-12-14 | 欧瑞传动电气有限公司 | Direct current bus voltage detecting circuit for low voltage frequency converter |
| CN102882440A (en) * | 2012-10-27 | 2013-01-16 | 株洲变流技术国家工程研究中心有限公司 | High-power braking energy consumption device and control method thereof |
| CN105429102A (en) * | 2015-12-22 | 2016-03-23 | 南京科远驱动技术有限公司 | Protection warning method and system for frequency converter equipped with multiple motors |
| CN208937644U (en) * | 2018-08-29 | 2019-06-04 | 长沙市小为电子科技有限公司 | Braking resistor qualitative detection circuit and its frequency converter |
| CN209805706U (en) * | 2019-05-17 | 2019-12-17 | 上海英威腾工业技术有限公司 | Dynamic braking circuit for servo motor |
| CN211123210U (en) * | 2019-09-12 | 2020-07-28 | 苏州汇川技术有限公司 | Brake resistor short circuit detection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 王守成: "浅谈交流SVTL变频器及其常见故障分析", 《2007年河北省轧钢技术与学术年会论文集》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112285537B (en) | 2023-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4730121A (en) | Power controller for circuits with battery backup | |
| CN102353825A (en) | Resistor sampling isolation current detection circuit | |
| KR20200093454A (en) | Low power cycle to cycle bit transfer in gate drivers | |
| EP4027160A1 (en) | Universal plug status detection circuit | |
| CN112285537B (en) | Circuit and method for self-diagnosis of main circuit of frequency converter | |
| CN108462152A (en) | A kind of two-phase DC Brushless Motor output protection circuit | |
| CN109687396B (en) | A kind of IGBT short-circuit protection circuit and its implementation | |
| CN209104785U (en) | A kind of current foldback circuit | |
| CN114792966A (en) | Overcurrent protection circuit for motor drive circuit, motor drive circuit and electric equipment | |
| CN209709672U (en) | A kind of three-phase motor driver overcurrent protective device | |
| CN209673929U (en) | A kind of IGBT short-circuit detecting circuit | |
| CN206431159U (en) | Rail vehicle speed acquisition circuit and rail vehicle | |
| CN208094167U (en) | A kind of two-phase DC Brushless Motor output protection circuit | |
| CN213937869U (en) | Isolated switching value signal tri-state detection circuit | |
| CN220022318U (en) | Small-size high performance direct current motor drive plate | |
| CN220105203U (en) | SIL4 functional safety output's self-checking circuit | |
| CN104038191A (en) | Driving circuit of voltage type gate control device | |
| CN220325276U (en) | Electric motorcycle and motor controller thereof | |
| CN110289598B (en) | Comprehensive protection device and method applied to full-bridge inverter circuit | |
| CN219960424U (en) | Driving circuit applied to direct-current brushless motor | |
| CN208781167U (en) | A kind of MCU power supply system with self-test defencive function | |
| CN216131448U (en) | Intelligent gas meter valve driving circuit | |
| CN213521283U (en) | Overload protection circuit based on vehicle-mounted integrated electronic system | |
| CN112455366B (en) | Automobile combination instrument control circuit capable of detecting high-side load open circuit | |
| CN212137619U (en) | Differential input level converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |