CN211908663U - Active stabilizing device for bus voltage of frequency converter - Google Patents
Active stabilizing device for bus voltage of frequency converter Download PDFInfo
- Publication number
- CN211908663U CN211908663U CN202020438494.2U CN202020438494U CN211908663U CN 211908663 U CN211908663 U CN 211908663U CN 202020438494 U CN202020438494 U CN 202020438494U CN 211908663 U CN211908663 U CN 211908663U
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- bus voltage
- power supply
- circuit
- chip microcomputer
- 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.)
- Active
Links
Images
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses an active stabilizing device for bus voltage of a frequency converter, which comprises a bus voltage sampling circuit, a singlechip, a power amplifying circuit and a rectification silicon controlled rectifier main circuit; the bus voltage sampling circuit is connected with the input end of the single chip microcomputer and is used for acquiring the bus voltage 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. The utility model provides a converter busbar voltage initiative type stabilising arrangement adopts simple electronic circuit control form, with converter or servo driver's busbar voltage control at narrower within range.
Description
Technical Field
The utility model relates to a converter bus-bar voltage initiative type stabilising arrangement belongs to converter technical field.
Background
At present, frequency converters or servo drivers are widely adopted in factories, vector control is a more precise control mode, output current and bus voltage participate in internal control program operation, so stable bus direct current voltage is particularly important, and the current general technical method is to control the bus voltage in a wider range (taking AC380V input as an example, the requirement is between DC 350V and DC 800V), and the drivers alarm long-time voltage or overvoltage when the bus voltage exceeds the interval.
In actual operation, under the condition that a frequency converter or a servo driver is normal, the possibility of long-time pressure is very low; however, the failure rate of overvoltage is high due to the load inertia characteristic, the excessively short deceleration time, the actual use conditions such as the requirement for synchronous control of a plurality of drivers, and the like. The method for preventing overvoltage mainly has the defects of large energy loss, wide fluctuation range of bus voltage, large heating of brake resistor, unsuitability for frequently adjusting the bus voltage, and only being used as an electrical safety measure, and having no effect on precise control.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome prior art not enough, provide a converter bus voltage initiative type stabilising arrangement, adopt simple electronic circuit control form, with converter or servo driver's bus voltage control at narrower within range.
In order to solve the technical problem, the technical scheme of the utility model is that:
a frequency converter bus voltage active stabilizing device comprises a bus voltage sampling circuit, a single chip microcomputer, a power amplifying circuit and a rectification silicon controlled rectifier main circuit;
the bus voltage sampling circuit is connected with the input end of the single chip microcomputer and is used for acquiring the bus voltage 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 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 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 utility model discloses following beneficial effect has:
1. the utility model discloses a conduction angle size of every silicon controlled rectifier of control, the initiative is adjusted busbar voltage, with its control in narrower interval within range, and the overvoltage alarm when effectively avoiding the motor to be dragged power generation state or big inertia load shut down takes place.
2. The rectifier silicon controlled rectifier is controlled by the single chip microcomputer, so that more accurate vector control is guaranteed.
3. And a high-power brake resistor and a special brake module are omitted, and the production cost of equipment is saved.
4. Energy consumption braking is avoided, and electric power resources and operation cost are saved.
Drawings
Fig. 1 is a schematic block diagram of the active stabilizer for bus voltage of frequency converter of 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 the bus voltage sampling circuit of the present invention;
fig. 4 is a schematic circuit diagram of the single chip microcomputer of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 1, the active type stabilizing device for the bus voltage of the frequency converter comprises a bus voltage sampling circuit, a single chip microcomputer U1, a power amplifying circuit and a rectification silicon controlled rectifier main circuit, wherein the bus voltage sampling circuit is connected with the input end of the single chip microcomputer U1 and is used for collecting the bus voltage of the frequency converter.
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.
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 in a rectifier main circuit to obtain bus sampling voltage, the voltage is input to a single chip microcomputer U1, the output end of the single chip microcomputer U1 is processed by a power amplifying circuit to control the conduction angle of a bridge rectifier silicon controlled rectifier, the conduction angle is reduced when the bus sampling voltage is increased, the conduction angle is increased when the bus sampling voltage is reduced, and the effect of stabilizing the voltage in the normal operation process of the frequency converter is achieved.
In the starting process of the frequency converter, a starting signal from a frequency converter control main board is input to the rectification silicon controlled rectifier main circuit, so that the conduction angle is opened to the maximum, and the possibility of undervoltage is avoided; in the process of deceleration and stop, the main rectifier controlled silicon circuit obtains a stop signal of the frequency converter to actively and gradually close the conduction angle, so that the power supply in the main rectifier circuit is cut off, the speed of the conduction angle is reduced, the time for finally closing the controllable silicon is matched with the stop deceleration time set by the frequency converter, and the stop speed is determined by the internal program calculation of the single chip microcomputer.
As shown in fig. 3, the bus voltage sampling circuit includes high-voltage resistors R1-R4, a linear opto-coupler U2, a power chip U3 and an operational amplifier U4, the high-voltage resistors R1-R4 are connected in series to the P-terminal of the PN bus and connected to the 2-pin of the linear opto-coupler U2, the 8-pin of the power chip U3 is connected to a +16V power supply of the inverter drive lower bridge, the 1-pin of the power chip U3 provides a +5V power supply for the input side of the linear opto-coupler U2, the output side of the linear opto-coupler U2 provides a +5V power supply from the inverter switching power supply, the 6-pin and the 7-pin of the linear opto-coupler U2 are connected to the 2-pin and the 3-pin of the operational amplifier U4, the operational amplifier U4 provides a +15V power supply from the inverter switching power supply, the 1-pin of the operational amplifier U4 is connected to the 6-. The model of the high-voltage resistor R1-R4 is 2203, the model of the linear optical coupling U2 is A7840, the model of the power supply chip U3 is 78L05, and the model of the operational amplifier U4 is LF 393. The DC voltage from PN bus is decompressed by high voltage resistor R1-R4 and then input to 2 feet of linear optical coupling U2, 1 foot and 4 feet are input side power supply of linear optical coupling U2, the input side power supply is provided by converting +16V of lower bridge driven by frequency converter into +5V stable voltage through power supply chip U3, the voltage is common to N, the output side power supply of linear optical coupling U2 is 5 feet and 8 feet, which are isolated from the input side power supply, when the 2 feet voltage of linear optical coupling U2 changes, the 6 and 7 feet voltage of linear optical coupling U2 changes correspondingly and outputs to non-inverting and inverting input ends of operational amplifier U4, 1 foot of operational amplifier U4 outputs DCOUT to single chip U1 for further signal control.
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 fig. 2, the rectification silicon-controlled main circuit comprises a rectification circuit and an IGBT inverter module, the rectification circuit adopts an upper bridge silicon-controlled full-bridge rectification mode and a lower bridge silicon-controlled full-bridge rectification mode, the model of the IGBT module is BSM200GD60DLC, the rectification control end g1-g6 obtains PWM rectangular waves with variable duty ratio from a single chip microcomputer U1 to control the conduction angle of each silicon-controlled rectifier, so as to achieve the purpose of controllable bus voltage of the frequency converter, and taking AC380V as an example, the bus voltage is controlled to be between DC520V V and DC 600V, so that a reliable vector control effect is achieved; on the other hand, the utility model discloses can omit the brake module and the high-power brake resistance of traditional converter, reach the effect that reduces equipment manufacturing cost and reduction work energy consumption. The utility model discloses a rectification and contravariant detached form to realize automatic control to the rectification.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a converter busbar voltage initiative type stabilising arrangement which characterized in that: the device comprises a bus voltage sampling circuit, a single chip microcomputer, a power amplifying circuit and a rectification silicon controlled rectifier main circuit;
the bus voltage sampling circuit is connected with the input end of the single chip microcomputer and is used for acquiring the bus voltage 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 active type stabilizing device for bus voltage of frequency converter according to claim 1, characterized in that: the input end of the single chip microcomputer also receives start-stop signals and deceleration time parameters of the frequency converter mainboard.
3. The active type stabilizing device for bus voltage of frequency converter according to claim 1, characterized in that: 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.
4. The active type stabilizing device for bus voltage of frequency converter according to claim 1, characterized in that: 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.
5. The active type stabilizing device for bus voltage of frequency converter according to claim 1, characterized in that: 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 |
|---|---|---|---|
| CN202020438494.2U CN211908663U (en) | 2020-03-30 | 2020-03-30 | Active stabilizing device for bus voltage of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020438494.2U CN211908663U (en) | 2020-03-30 | 2020-03-30 | Active stabilizing device for bus voltage of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211908663U true CN211908663U (en) | 2020-11-10 |
Family
ID=73274700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020438494.2U Active CN211908663U (en) | 2020-03-30 | 2020-03-30 | Active stabilizing device for bus voltage of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211908663U (en) |
-
2020
- 2020-03-30 CN CN202020438494.2U patent/CN211908663U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101685971B (en) | Low-temperature active device and method of vehicle lithium iron phosphate lithium battery | |
| CN202260542U (en) | Energy regulator | |
| CN109823187B (en) | Electric braking energy feedback system | |
| CN102412773B (en) | Control circuit of switched reluctance motor with double chopped wave limits | |
| CN103036259A (en) | Energy adjustment method | |
| CN103425057A (en) | Switch circuit and electronic device with same | |
| CN211908663U (en) | Active stabilizing device for bus voltage of frequency converter | |
| CN210156929U (en) | Energy storage power supply hysteresis control system | |
| CN203301376U (en) | Vehicle direct current transition assembly | |
| CN205178866U (en) | Wind generating set driftage converter direct current overvoltage protector and variable frequency device | |
| CN111404394A (en) | Active stabilizing device for bus voltage of frequency converter | |
| CN103595093A (en) | Solar storage battery discharging device | |
| CN212111634U (en) | Power generation state detection device of variable frequency controller | |
| CN203026919U (en) | Input under-voltage protection circuit of photovoltaic inverter power supply | |
| CN212969493U (en) | Control system for stepless speed regulation of alternating current fan | |
| CN211924440U (en) | Dual-control system applied to air conditioner compressor | |
| CN213459853U (en) | Relay holding device and battery pack | |
| CN111398712A (en) | Power generation state detection device of variable frequency controller | |
| CN210281032U (en) | Full-digital inverter welding machine sampling and control system | |
| CN203456906U (en) | Energy-saving apparatus based on storage battery charge and discharge system | |
| CN201239845Y (en) | Control device of single end forward inverter type electric welding machine | |
| CN202395712U (en) | Control circuit of double-chopped-wave switch reluctance motor | |
| CN210273595U (en) | Photovoltaic power supply device for rail transit | |
| CN205490280U (en) | Energy -conserving motor control means | |
| CN205178872U (en) | Electric automobile DCDCConverter's enable signal control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |