CN112285537B - 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
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- CN112285537B CN112285537B CN202011169580.9A CN202011169580A CN112285537B CN 112285537 B CN112285537 B CN 112285537B CN 202011169580 A CN202011169580 A CN 202011169580A CN 112285537 B CN112285537 B CN 112285537B
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- 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
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- 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
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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, bus voltage is isolated and then converted into a linear analog quantity signal, and the linear analog quantity signal is used for a microprocessor control unit to read a 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, the main circuit comprises a rectifier bridge, a bus capacitor, a regeneration resistor, a pre-charging relay and a regeneration unit, and a common cathode, one end of the bus capacitor and one end of the regeneration resistor of the rectifier bridge are connected to the positive pole P end of a direct current bus in the main circuit;
the common anode of the rectifier bridge, one end of the pre-charging relay and one end of the pre-charging resistor are connected in the main circuit, and a connection point B end is formed in the main circuit;
the other end of the pre-charging relay, the other end of the pre-charging resistor, the other end of the bus capacitor and an IGBT emitter of the regeneration unit are all connected to the N end of the cathode of the direct current bus in the main circuit;
the other end of the regeneration resistor and an IGBT collector of the regeneration unit are both connected into the main circuit, and a contact point C end is formed in the main circuit;
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 state of the signal 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 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 supply VCC, and the other end is connected with a collector of the photoelectric coupler OP 1;
the cathode of the photoelectric coupler OP1 is connected with the terminal B in the main circuit, and the emitter of the photoelectric coupler OP1 is connected with the reference ground GND.
A self-diagnosis method using the circuit for self-diagnosis of a main circuit of a frequency converter described above comprises:
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;
and 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), reads the STATE of the STATE signal of the detection unit after the regeneration unit is switched on or switched off, and judges the STATE of the pre-charging resistor, the STATE of the regeneration resistor and the STATE of the regeneration unit by combining the current bus voltage value STATE and the regeneration unit driving signal STATE 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 that the regeneration unit is controlled 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 supply VCC, and the other end is connected with a collector of the photoelectric coupler OP 1; the cathode of the photoelectric coupler OP1 is connected with the terminal B in the main circuit, and the emitter of the photoelectric coupler OP1 is connected with the reference 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, the main circuit comprises a rectifier bridge, a bus capacitor, a regeneration resistor, a pre-charging relay and a regeneration unit, and a common cathode, one end of the bus capacitor and one end of the regeneration resistor of the rectifier bridge are connected to the positive pole P end of a direct current bus in the main circuit;
the common anode of the rectifier bridge, one end of the pre-charging relay and one end of the pre-charging resistor are connected in the main circuit, and a connection point B end is formed in the main circuit;
the other end of the pre-charging relay, the other end of the pre-charging resistor, the other end of the bus capacitor and an IGBT emitter of the regeneration unit are all connected to the N end of the negative electrode of the direct-current bus in the main circuit;
the other end of the regeneration resistor and an IGBT collector of the regeneration unit are both connected into the main circuit, and a contact point C end is formed in the main circuit;
the method is characterized in that:
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 state of the signal 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 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 supply VCC, and the other end is connected with a collector of the photoelectric coupler OP 1;
the cathode of the photoelectric coupler OP1 is connected with the terminal B in the main circuit, and the emitter of the photoelectric coupler OP1 is connected with the reference ground GND.
2. A self-diagnosis method using the circuit for self-diagnosis of a main circuit of a frequency converter according to claim 1, 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), reads the STATE of the STATE signal of the detection unit after the regeneration unit is switched on or switched off, and judges the STATE of the pre-charging resistor, the STATE of the regeneration resistor and the STATE of the regeneration unit by combining the current bus voltage value STATE and the regeneration unit driving signal STATE to realize a self-diagnosis function.
3. The self-diagnosis method of circuit for self-diagnosis of main circuit of 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. The self-diagnosis method of circuit for self-diagnosis of main circuit of frequency converter according to claim 2, characterized in that: the DRIVE signal is a high level or low level digital quantity signal.
5. The self-diagnosis method of circuit for self-diagnosis of main circuit of frequency converter according to claim 2, characterized in that: the STATE signal is a high-level or low-level digital quantity signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011169580.9A CN112285537B (en) | 2020-10-28 | 2020-10-28 | Circuit and method for self-diagnosis of main circuit of frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011169580.9A CN112285537B (en) | 2020-10-28 | 2020-10-28 | Circuit and method for self-diagnosis of main circuit of frequency converter |
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| CN112285537A CN112285537A (en) | 2021-01-29 |
| CN112285537B true CN112285537B (en) | 2023-03-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3663506B2 (en) * | 2000-12-20 | 2005-06-22 | 株式会社安川電機 | Fault detection circuit for braking switching element of inverter, and inverter |
| JP5255747B2 (en) * | 2005-07-05 | 2013-08-07 | 株式会社日立産機システム | Phase loss detection circuit and electrical equipment |
| 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 |
| CN102882440B (en) * | 2012-10-27 | 2016-03-02 | 株洲时代装备技术有限责任公司 | A kind of high-power braking energy consumer 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 |
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