CN111398712A - Power generation state detection device of variable frequency controller - Google Patents
Power generation state detection device of variable frequency controller Download PDFInfo
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- CN111398712A CN111398712A CN202010235635.5A CN202010235635A CN111398712A CN 111398712 A CN111398712 A CN 111398712A CN 202010235635 A CN202010235635 A CN 202010235635A CN 111398712 A CN111398712 A CN 111398712A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a power generation state detection device of a variable frequency controller, which comprises a bus voltage sampling circuit, a bus current direction monitoring circuit, a singlechip, a power amplification circuit and a rectification silicon controlled rectifier main circuit, wherein the bus voltage sampling circuit is connected with the bus current direction monitoring circuit; the bus voltage sampling circuit and the bus current direction monitoring circuit are respectively connected with the input end of the single chip microcomputer, the bus voltage sampling circuit is used for collecting the bus voltage of the frequency converter, and the bus current direction monitoring circuit is used for monitoring the bus current direction of the frequency converter. The invention provides a power generation state detection device of a variable frequency controller, which adopts a pure electronic circuit monitoring mode to monitor the bus voltage and the output current of a frequency converter or a servo driver and distinguish whether the frequency converter is in a power generation state in time so as to be convenient for the frequency converter to effectively control the next step and avoid the free halt of the frequency converter due to overvoltage alarm, thereby further avoiding the possibility of halt of a production line due to faults and improving the yield of the production line.
Description
Technical Field
The invention relates to a power generation state detection device of a variable frequency controller, and belongs to the technical field of frequency converters.
Background
At present, frequency converters or servo drivers are widely adopted in factories, vector control is a relatively precise control form, and output current and bus voltage participate in internal control program operation. The working state of the motor is divided into: the motor is in a power generation state, the frequency converter is easy to have overvoltage alarm and lose a normal control function, and therefore safety accidents that the motor is out of control are caused.
In the control of a frequency converter or a servo driver, the power generation state is not detected and monitored, and the power generation state is stopped by alarming overvoltage when reaching a certain bus high voltage, so that the mode of passively preventing a power capacitor and other elements from failure due to high voltage is provided. In practical application, the motor is often in a power generation state due to the load inertia characteristic, too short deceleration time, the synchronous control requirements of a plurality of drivers and other practical use conditions, and the overvoltage fault rate is very high. The method for preventing overvoltage in the prior art adopts a method of adding an internal brake resistor relief circuit to an IGBT (insulated gate bipolar translator) in a frequency converter or adding an external brake resistor to a special brake module in a high-power frequency converter, and the method for preventing overvoltage in energy consumption braking has the main defects of high energy loss and high brake resistor heating, and is particularly not suitable for a production line for synchronizing a plurality of drivers.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a power generation state detection device of a variable frequency controller, which adopts a pure electronic circuit monitoring mode to monitor the bus voltage and the output current of a frequency converter or a servo driver and distinguish whether the frequency converter is in a power generation state in time so as to be convenient for the frequency converter to effectively control the next step and avoid the free halt of the frequency converter due to overvoltage alarm, thereby further avoiding the possibility of halt of a production line due to faults and improving the yield of the production line.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a power generation state detection device of a variable frequency controller comprises a bus voltage sampling circuit, a bus current direction monitoring circuit, a single chip microcomputer, a power amplifying circuit and a rectification silicon controlled rectifier main circuit;
the bus voltage sampling circuit and the bus current direction monitoring circuit are respectively connected with the input end of the single chip microcomputer, the bus voltage sampling circuit is used for collecting the bus voltage of the frequency converter, and the bus current direction monitoring circuit is used for monitoring the bus current direction of the frequency converter;
the output end of the single chip microcomputer is connected with the input end of the power amplification circuit, the output end of the power amplification circuit is connected with the rectification silicon controlled rectifier main circuit, and the single chip microcomputer drives the rectification silicon controlled rectifier main circuit through the power amplification circuit to control the size of the conduction angle of the rectification silicon controlled rectifier.
Further, the input end of the single chip microcomputer receives start-stop signals and deceleration time parameters of the frequency converter mainboard.
Further, the output end of the single chip microcomputer feeds the power generation state of the frequency converter back to the frequency converter main board.
Further, the bus voltage sampling circuit comprises high-voltage resistors R1-R4, a linear optical coupling U2, a power chip U3 and an operational amplifier U4, wherein the high-voltage resistors R1-R4 are connected in series at the P end of a PN bus and connected with a pin 2 of the linear optical coupling U2, a pin 8 of the power chip U3 is connected with a frequency converter to drive a lower bridge +16V power supply, a pin 1 of the power chip U3 provides a +5V power supply for the input side of the linear optical coupling U2, the output side of the linear optical coupling U2 provides a +5V power supply through a frequency converter switching power supply, pins 6 and 7 of the linear optical coupling U2 are respectively connected with pins 2 and 3 of the operational amplifier U4, the operational amplifier U4 provides a +15V power supply through the frequency converter switching power supply, and a pin 1 of the operational amplifier U4 is connected with a pin 6, so that a bus voltage sampling signal is transmitted to the single chip microcomputer U1.
Further, the bus current direction monitoring circuit comprises energy storage capacitors C5 and C6, voltage equalizing resistors R5 and R6, sampling resistors R7 and R8 and optical couplers U5 and U6, the energy storage capacitors C5 and C6 are connected in series and then connected in parallel at two ends of a PN bus, the energy storage capacitor C5 is connected in parallel with the voltage equalizing resistor R5, the energy storage capacitor C6 is connected in parallel with the voltage equalizing resistor R6, the sampling resistors R7 and R8 are connected in series at two ends of the PN bus respectively, and two ends of the PN bus drive the optical couplers U1 and U2 to transmit bus current direction signals to a 34 pin and a 33 pin of a single chip microcomputer U1 through current limiting resistors.
Further, the power amplification circuit comprises a triode Q1, optocouplers U7 and U8, the base of the triode Q1 is connected with the 39 pin of the singlechip U1, the emitter of the triode Q1 is powered by a frequency converter switching power supply to provide a +5V power supply, the collector of the triode Q1 is connected with the input ends of the optocouplers U7 and U8, and the output ends of the optocouplers U7 and U8 are respectively connected with the main circuit of the rectifier silicon controlled rectifier.
Further, the rectification controllable silicon main circuit comprises a rectification circuit and an IGBT module.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the invention can timely judge the power generation state of the frequency converter through the bus voltage sampling circuit and the bus current direction monitoring circuit, and is beneficial to carrying out synchronous control.
2. Effectively reducing the possibility of overvoltage alarm shutdown.
3. Effectively avoid the production line excessive pressure trouble to shut down, improve the yields.
4. And the maintenance personnel can further determine the fault point on the production line.
5. Energy consumption braking is avoided, and electric power resources and operation cost are saved.
Drawings
FIG. 1 is a schematic block diagram of an apparatus for detecting a power generation state of a variable frequency controller according to the present invention;
FIG. 2 is a schematic circuit diagram of the main circuit of the rectifier thyristor of the present invention;
FIG. 3 is a schematic circuit diagram of a bus voltage sampling circuit of the present invention;
FIG. 4 is a schematic circuit diagram of the single-chip microcomputer of the present invention;
fig. 5 is a circuit schematic diagram of a bus current direction monitoring circuit of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, a power generation state detection device of a variable frequency controller comprises a bus voltage sampling circuit, a bus current direction monitoring circuit, a single chip microcomputer U1, a power amplification circuit and a rectification silicon controlled rectifier main circuit;
after obtaining a bus voltage signal of the frequency converter, the bus voltage sampling circuit sends the bus voltage signal of the frequency converter, a start-stop signal and a deceleration time parameter from a main board of the frequency converter to the single chip microcomputer U1, the single chip microcomputer U1 drives a silicon controlled rectifier control end of a rectification silicon controlled rectifier main circuit through a power amplification circuit to control the size of a conduction angle of the rectification silicon controlled rectifier, and in an initial operation stage, the conduction angle is gradually increased to play a role of buffering, so that the charging current of a power capacitor of the main circuit is; in the operation process, the conduction angle is reduced when the bus voltage rises, and the conduction angle is increased when the bus voltage falls; in the process of deceleration and stop, the speed of reducing the conduction angle and the time of completely closing the silicon controlled rectifier are determined by matching with the stop deceleration time set by the frequency converter and calculating by the singlechip U1. On the other hand, the single chip microcomputer U1 monitors the bus voltage of the frequency converter, when the voltage rises to a certain value, the power generation state is judged, and the signal is fed back to the frequency converter main board, so that the frequency converter main board can conveniently adjust the control strategy of the next step.
As shown in fig. 1, a bus voltage sampling circuit and a bus current direction monitoring circuit are respectively connected with the input end of the single chip microcomputer U1, the bus voltage sampling circuit is used for collecting the bus voltage of the frequency converter, and the bus current direction monitoring circuit is used for monitoring the bus current direction of the frequency converter. The invention simultaneously monitors the bus voltage and the bus current direction of the frequency converter, and takes the two indexes as main parameter indexes for judging the working state of the motor.
On one hand, by utilizing the large-capacity characteristic of a built-in power capacitor of the frequency converter, a row of high-voltage resistors R1-R4 are respectively connected in series at two ends of a PN bus to obtain bus sampling voltage, the bus sampling voltage is processed by a linear optocoupler U2 and then is sent to an operational amplifier U4, if the bus voltage is increased, the motor is in a dragging power generation state, and if the bus voltage is reduced or basically unchanged, the motor is in an electric state.
On the other hand, the bus current direction is monitored, when the bus is in the electric state, the bus current direction is P-IGBT inverter module-motor-N-P, and when the bus current direction is opposite in the power generation state process, the bus current direction is a freewheeling diode-P-N-motor in the motor-IGBT inverter module, so that whether the bus is in the power generation state or not is judged. After the frequency converter is judged to be in a power generation state, the rectification is gradually reduced until the conduction angle of the silicon controlled rectifier is completely closed, so that the power supply is reduced or disconnected, and overvoltage alarming is avoided.
As shown in fig. 3, the bus voltage sampling circuit includes a high voltage resistor R-R, a linear opto-coupler U, a power chip U and an operational amplifier U, the high voltage resistor R-R is connected in series to the P-side of the PN bus and connected to the 2-pin of the linear opto-coupler U, the 8-pin of the power chip U is connected to the +16V power supply of the inverter drive lower bridge, the 1-pin of the power chip U provides +5V power supply for the input side of the linear opto-coupler U, the output side of the linear opto-coupler U provides +5V power supply from the inverter switching power supply, the 6-pin and the 7-pin of the linear opto-coupler U are connected to the 2-pin and the 3-pin of the operational amplifier U, the operational amplifier U provides +15V power supply from the inverter switching power supply, the 1-pin of the operational amplifier U is connected to the 6-pin of the single chip, the bus voltage sampling signal is transmitted to the single chip at the model of the high voltage resistor R-R2203, the linear opto-coupler U model U is a7840, the power chip U is 78, the operational amplifier U is a dc voltage from the PN bus to the input side of the high voltage resistor R-R, the single chip, the input side of the single chip, the linear opto-coupler U, the input side is connected to the input side of the single chip U, the linear opto-coupler U, the input side, the single chip U2-coupler U, the input side output terminal, the single chip U is connected to output terminal, the input terminal of the single chip U, the single.
As shown in fig. 5, the bus current direction monitoring circuit includes energy storage capacitors C5 and C6, voltage equalizing resistors R5 and R6, sampling resistors R7 and R8, and optical couplers U5 and U6, the energy storage capacitors C5 and C6 are connected in series and then connected in parallel to two ends of the PN bus, the energy storage capacitor C5 is connected in parallel with the voltage equalizing resistor R5, the energy storage capacitor C6 is connected in parallel with the voltage equalizing resistor R6, the sampling resistors R7 and R8 are connected in series to two ends of the PN bus respectively, and two ends of the PN bus drive the optical couplers U1 and U2 through current limiting resistors to transmit bus current direction signals to 34 pins and 33 pins of the single chip microcomputer U1. The two ends of a PN bus behind the bridge rectifier circuit are connected in parallel with two energy storage capacitors C5 and C6 which are connected in series, the purpose is to raise the rectified voltage to DC 540V, two voltage-sharing resistors R5 and R6 with the model number of 20W50K ensure that the voltage of the two ends of each energy storage capacitor is equal, a switch KA1 and a 20W 300 ohm resistor connected in parallel are used as a charging buffer circuit, the switch KA1 is in an off state before the voltage reaches 400V, the 20W 30 ohm resistor plays a role in charging buffer, and after the voltage reaches 400V, the switch KA1 is closed to short circuit the 20W 300 ohm resistor. The two ends of the PN bus are both connected with 30 milliohm sampling resistors R7 and R8 in series, the current limiting resistors R9-R12 drive the optocouplers U5 and U6, the conduction of the optocoupler U5 is in an electric state, the conduction of the optocoupler U6 is in a power generation state, the two signals are sent to two input pins of the singlechip U1 and then sent to a frequency converter mainboard together with a PN bus voltage detection signal, and the mainboard determines the control form of the next step.
As shown in fig. 4, the model of the single chip microcomputer U1 is 80C51, the output end of the single chip microcomputer U1 is connected with the input end of the power amplifying circuit, the output end of the power amplifying circuit is connected with the main circuit of the rectifier thyristor, and the single chip microcomputer U1 drives the main circuit of the rectifier thyristor through the power amplifying circuit to control the size of the conduction angle of the rectifier thyristor. The power amplification circuit comprises a triode Q1, optocouplers U7 and U8, the base of the triode Q1 is connected with the 39 pin of the singlechip U1, the emitter of the triode Q1 is powered by a frequency converter switching power supply to provide +5V power, the collector of the triode Q1 is connected with the input ends of the optocouplers U7 and U8, and the output ends of the optocouplers U7 and U8 are respectively connected with a main circuit of a rectification silicon controlled rectifier. The +5V power supply of the single chip microcomputer U1 comes from a frequency converter switching power supply, the X1 and the X2 are used as input signals of start and stop signals of a frequency converter main board, an output signal DCOUT of a pin 1 of the operational amplifier U4 is also used as an input signal of the single chip microcomputer, and speed reduction time parameters set by the frequency converter main board are transmitted to a pin 10 and a pin 11 of the single chip microcomputer U1 through a communication bus. The triode Q1 is used as an electronic switch controlled by the singlechip U1, and has the function that when the singlechip U1 program enables the electronic switch to function, the primary circuit output by the two optical couplers U7 and U8 is switched on, so that the power consumption and the heat productivity of the circuit board are reduced, and the service life of the electronic element is prolonged. The two optical couplers U7 and U8 finally drive the control ends g1-g6 of the main circuit of the rectification silicon controlled rectifier in the figure 2, so that the effect of controlling the conduction angle is achieved.
As shown in figure 2, the rectification silicon controlled rectifier main circuit comprises a rectification circuit and an IGBT inverter module, wherein the rectification circuit adopts an upper bridge silicon controlled rectifier full bridge rectification mode and a lower bridge silicon controlled rectifier full bridge rectification mode, the model of the IGBT module is BSM200GD60D L C, and a rectification control end g1-g6 obtains PWM rectangular waves with variable duty ratios from a single chip microcomputer U1 so as to control the size of a conduction angle of each silicon controlled rectifier and obtain the purpose of controllable bus voltage.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a frequency conversion controller power generation state detection device which characterized in that: the device comprises a bus voltage sampling circuit, a bus current direction monitoring circuit, a singlechip, a power amplifying circuit and a rectification silicon controlled rectifier main circuit;
the bus voltage sampling circuit and the bus current direction monitoring circuit are respectively connected with the input end of the single chip microcomputer, the bus voltage sampling circuit is used for collecting the bus voltage of the frequency converter, and the bus current direction monitoring circuit is used for monitoring the bus current direction of the frequency converter;
the output end of the single chip microcomputer is connected with the input end of the power amplification circuit, the output end of the power amplification circuit is connected with the rectification silicon controlled rectifier main circuit, and the single chip microcomputer drives the rectification silicon controlled rectifier main circuit through the power amplification circuit to control the size of the conduction angle of the rectification silicon controlled rectifier.
2. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: the input end of the single chip microcomputer also receives start-stop signals and deceleration time parameters of the frequency converter mainboard.
3. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: and the output end of the single chip microcomputer feeds the power generation state of the frequency converter back to the frequency converter mainboard.
4. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: the bus voltage sampling circuit comprises high-voltage resistors R1-R4, a linear optical coupler U2, a power supply chip U3 and an operational amplifier U4, wherein the high-voltage resistors R1-R4 are connected in series at the P end of a PN bus and connected with 2 pins of a linear optical coupler U2, 8 pins of the power supply chip U3 are connected with a frequency converter driving lower bridge +16V power supply, 1 pin of the power supply chip U3 provides +5V power supply for the input side of the linear optical coupler U2, the output side of the linear optical coupler U2 is provided with +5V power supply by a frequency converter switching power supply, 6 pins and 7 pins of the linear optical coupler U2 are respectively connected with 2 pins and 3 pins of the operational amplifier U4, the operational amplifier U4 is provided with +15V power supply by the frequency converter switching power supply, and 1 pin of the operational amplifier U4 is connected with 6 pins of the single chip microcomputer U1.
5. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: the bus current direction monitoring circuit comprises energy storage capacitors C5 and C6, voltage equalizing resistors R5 and R6, sampling resistors R7 and R8 and optical couplers U5 and U6, the energy storage capacitors C5 and C6 are connected in series and then connected in parallel at two ends of a PN bus, the energy storage capacitor C5 is connected in parallel with the voltage equalizing resistor R5, the energy storage capacitor C6 is connected in parallel with the voltage equalizing resistor R6, the sampling resistors R7 and R8 are connected in series at two ends of the PN bus respectively, and two ends of the PN bus drive the optical couplers U1 and U2 to transmit bus current direction signals to a 34 pin and a 33 pin of a single chip microcomputer U1 through current limiting resistors.
6. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: the power amplification circuit comprises a triode Q1, optocouplers U7 and U8, the base of the triode Q1 is connected with the 39 pin of the singlechip U1, the emitter of the triode Q1 is powered by a frequency converter switching power supply to provide a +5V power supply, the collector of the triode Q1 is connected with the input ends of the optocouplers U7 and U8, and the output ends of the optocouplers U7 and U8 are respectively connected with a main circuit of a rectification silicon controlled rectifier.
7. The apparatus for detecting a power generation state of a variable frequency controller according to claim 1, wherein: the rectification silicon controlled rectifier main circuit comprises a rectification circuit and an IGBT module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235635.5A CN111398712A (en) | 2020-03-30 | 2020-03-30 | Power generation state detection device of variable frequency controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235635.5A CN111398712A (en) | 2020-03-30 | 2020-03-30 | Power generation state detection device of variable frequency controller |
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| Publication Number | Publication Date |
|---|---|
| CN111398712A true CN111398712A (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010235635.5A Pending CN111398712A (en) | 2020-03-30 | 2020-03-30 | Power generation state detection device of variable frequency controller |
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| CN (1) | CN111398712A (en) |
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2020
- 2020-03-30 CN CN202010235635.5A patent/CN111398712A/en active Pending
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