CN112350553A - Silicon controlled rectifier controller for frequency converter - Google Patents
Silicon controlled rectifier controller for frequency converter Download PDFInfo
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- CN112350553A CN112350553A CN202011395546.3A CN202011395546A CN112350553A CN 112350553 A CN112350553 A CN 112350553A CN 202011395546 A CN202011395546 A CN 202011395546A CN 112350553 A CN112350553 A CN 112350553A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 43
- 239000010703 silicon Substances 0.000 title claims abstract description 43
- 238000002955 isolation Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000005669 field effect Effects 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical class 0.000 claims 1
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a silicon controlled rectifier controller for a frequency converter, which comprises an oscillator circuit, an MOSFET drive circuit and a pulse isolation trigger circuit, wherein the oscillator circuit, the MOSFET drive circuit and the pulse isolation trigger circuit are sequentially connected, the MOSFET drive circuit is respectively connected with a photoelectric isolation circuit and a power supply circuit, and the pulse isolation trigger circuit is connected with a silicon controlled rectifier electronic switch. The maximum grade of the output power of the invention exceeds 100kW, has the characteristics of high control speed, high efficiency, low cost, no spark, no noise and the like, is stable and reliable in control, realizes the on-off control of the special frequency converter and the intermediate frequency silicon controlled electronic switch of the load motor, and meets the control requirement of the special frequency converter on the on-off of the output intermediate frequency voltage.
Description
Technical Field
The invention belongs to the field of frequency converter control, and particularly relates to a silicon controlled rectifier controller for a frequency converter.
Background
The low-power special frequency converter generally adopts a contactor to control the connection and disconnection of the contactor and a load motor, and the contactor has the characteristics of small volume, simple control mode and the like, so that the requirement of load switching can be met. With the improvement of the power grade of the special frequency converter and the increase of the output load current of the special frequency converter, the traditional mechanical contactor can generate very large current, namely switching-on inrush current, due to the time randomness of load switching when switching the load. The switching-on inrush current not only affects the service life of the contactor, but also impacts a frequency converter and a load motor and affects the normal operation of other equipment on the system.
The silicon controlled electronic switch has fast response, can realize switching on and off within microsecond level, has the characteristics of contactless operation, no spark, no noise, high efficiency, low cost and the like, is widely applied in the industrial field, and has a mature corresponding controller. However, the silicon controlled controllers commonly used in the market are generally applied to the 50Hz power frequency occasion, and cannot meet the control requirement of the on-off of the medium-frequency voltage output by the special frequency converter, so that the silicon controlled controller of the special frequency converter is needed.
Disclosure of Invention
The invention aims to overcome the defect that the silicon controlled controller in the prior art cannot meet the control requirement of on-off of intermediate-frequency voltage, and the silicon controlled controller for the frequency converter is provided.
The invention is realized by the following technical scheme:
a silicon controlled rectifier controller for a frequency converter comprises an oscillator circuit, a MOSFET drive circuit and a pulse isolation trigger circuit which are sequentially connected, wherein the MOSFET drive circuit is respectively connected with a photoelectric isolation circuit and a power supply circuit, and the pulse isolation trigger circuit is connected with a silicon controlled rectifier electronic switch.
In the above technical solution, the oscillator circuit includes a flip-flop, a resistor R5 and a capacitor C5 connected to each other.
In the above technical solution, the oscillator circuit generates a pulse signal of 20 kHz.
In the above technical solution, the model of the schmitt trigger is schmitt trigger 4584.
In the above technical solution, the MOSFET driving circuit includes a driver and two MOSFET transistors respectively connected to the driver.
In the technical scheme, the MOSFET driving circuit changes a pulse signal generated by the oscillator circuit into a push-pull signal, and drives the two MOSFET tubes to be turned on in turn.
In the above technical solution, the model of the driver is IR 2110.
In the technical scheme, the pulse isolation trigger circuit comprises three groups of pulse transformer banks T1 and T2, T3 and T4 and T5 and T6, wherein the three groups of pulse transformer banks are connected in parallel; each pulse transformer is respectively connected with a corresponding rectifier bridge.
In the technical scheme, the pulse isolation trigger circuit couples and rectifies the signal output by the MOSFET driving circuit through the pulse transformer and then simultaneously triggers the six controllable silicon so as to control the conduction of the controllable silicon electronic switch.
In the technical scheme, the power supply circuit comprises a three-phase bridge rectifier, an electrolytic capacitor and a three-terminal voltage-stabilizing tube, wherein the three-phase bridge rectifier consists of diodes D5-D7 and D8-D10.
The invention has the beneficial effects that:
the invention provides a silicon controlled rectifier controller for a special frequency converter, which meets the driving requirement of a silicon controlled rectifier electronic switch of medium-frequency voltage of the special frequency converter, can be applied to special frequency converters with various power grades, and the maximum grade of output power exceeds 100 kW; the control method has the characteristics of high control speed, high efficiency, low cost, no spark, no noise and the like, is stable and reliable in control, realizes on-off control of the intermediate frequency silicon controlled electronic switch of the special frequency converter and the load motor, and meets the control requirement of the on-off of the intermediate frequency voltage output by the special frequency converter.
Drawings
FIG. 1 is a schematic structural diagram of a silicon controlled rectifier controller for a frequency converter according to the present invention applied to a dedicated frequency converter;
fig. 2 is a circuit diagram of a thyristor controller for a frequency converter according to the present invention.
Wherein:
1 oscillator circuit 2 MOSFET drive circuit
3 pulse isolation trigger circuit 4 photoelectric isolation circuit
5 power supply circuit 6 silicon controlled electronic switch
7 special frequency converter 8 loads motor.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention for the thyristor controller of the frequency converter are further described below by referring to the drawings of the specification and the specific embodiments.
As shown in fig. 1 and 2, a thyristor controller of a frequency converter comprises an oscillator circuit 1, a MOSFET driving circuit 2 and a pulse isolation trigger circuit 3 which are connected in sequence, wherein the MOSFET driving circuit 2 is respectively connected with a photoelectric isolation circuit 4 and a power supply circuit 5, and the pulse isolation trigger circuit 3 is connected with a thyristor electronic switch 6.
The oscillator circuit 1, the MOSFET drive circuit 2 and the pulse isolation trigger circuit 3 form a core circuit of the silicon controlled rectifier controller.
The oscillator circuit 1 is an oscillator circuit including a schmitt trigger 4584, a resistor, and a capacitor, and generates a pulse signal of about 20 kHz.
The specific circuit connections of the oscillator circuit 1 are as follows:
The MOSFET driving circuit 2 adopts IR2110 as a driver, changes a pulse signal generated by an oscillator circuit into a push-pull signal, and drives two MOSFET tubes to be turned on in turn.
The specific circuit connection of the MOSFET driving circuit 2 is as follows:
one end of the capacitor C3 is connected with the No. 9 pin, +15V of the driver U4, and the other end of the capacitor C3 is connected with the No. 13 pin and GND of the driver U4;
the anode of the diode D3 is connected with the anode of the electrolytic capacitor C2, one end of the capacitor C4 and the No. 3 pin and +15 of the driver U4; the cathode of the diode D3 is connected with one end of the C1 and the No. 6 pin of the driver U4; the other end of the capacitor C1 is connected with a pin No. 5 of a driver U4, a source electrode of a MOSFET tube U1, a drain electrode of the MOSFET tube U2, a pin No. 2 of a pulse transformer T2 in the pulse isolation trigger circuit 3, a pin No. 2 of a pulse transformer T4 and a pin No. 2 of a pulse transformer T6, and the other end of the capacitor C4 is connected with a cathode of an electrolytic capacitor C2, a pin No. 2 of a driver U4, a source electrode of the MOSFET tube U2 and GND. One end of the resistor R1 is connected to the cathode of the diode D1 and the pin No. 7 of the driver U4, and the other end of the resistor R1 is connected to the anode of the diode D1 and the gate of the MOSFET U1. One end of the resistor R2 is connected to the cathode of the diode D2 and the pin No. 1 of the driver U4, and the other end of the resistor R2 is connected to the anode of the diode D2 and the gate of the MOSFET U2.
The pulse isolation trigger circuit 3 couples and rectifies the signal output by the MOSFET drive circuit 2 through a pulse transformer and then simultaneously triggers six controllable silicon, so that the conduction of the controllable silicon electronic switch 6 is controlled, and the connection of the special frequency converter 7 and the load motor 8 is realized.
The specific circuit connection of the pulse isolation trigger circuit 3 is as follows:
No. 3 pin of the pulse transformer T1 is connected with No. 1 pin of the rectifier bridge B1, and No. 4 pin of the pulse transformer T1 is connected with No. 2 pin of the rectifier bridge B1. One end of a resistor R6 is connected with one end of a resistor R7 and a pin No. 3 of a rectifier bridge B1, the other end of the resistor R6 is connected with a cathode of a diode D11 and a pin No. 1 of a wiring terminal CN3, the other end of the resistor R7 is connected with an anode of the diode D11 and an anode of an electrolytic capacitor C8, and a cathode of the electrolytic capacitor C8 is connected with a pin No. 4 of the rectifier bridge B1 and a pin No. 2 of the wiring terminal CN 3.
No. 3 pin of the pulse transformer T2 is connected with No. 1 pin of the rectifier bridge B2, and No. 4 pin of the pulse transformer T2 is connected with No. 2 pin of the rectifier bridge B2. One end of a resistor R8 is connected with one end of a resistor R9 and a pin No. 3 of a rectifier bridge B2, the other end of the resistor R8 is connected with a cathode of a diode D12 and a pin No. 4 of a wiring terminal CN3, the other end of the resistor R9 is connected with an anode of the diode D12 and an anode of an electrolytic capacitor C9, and a cathode of the electrolytic capacitor C9 is connected with a pin No. 4 of the rectifier bridge B2 and a pin No. 5 of the wiring terminal CN 3.
No. 3 pin of the pulse transformer T3 is connected with No. 1 pin of the rectifier bridge B3, and No. 4 pin of the pulse transformer T3 is connected with No. 2 pin of the rectifier bridge B3. One end of a resistor R10 is connected with one end of a resistor R11 and a pin No. 3 of a rectifier bridge B3, the other end of the resistor R10 is connected with a cathode of a diode D13 and a pin No. 1 of a wiring terminal CN4, the other end of the resistor R11 is connected with an anode of the diode D13 and an anode of an electrolytic capacitor C10, and a cathode of the electrolytic capacitor C10 is connected with a pin No. 4 of the rectifier bridge B3 and a pin No. 2 of the wiring terminal CN 4.
No. 3 pin of the pulse transformer T4 is connected with No. 1 pin of the rectifier bridge B4, and No. 4 pin of the pulse transformer T4 is connected with No. 2 pin of the rectifier bridge B4. One end of a resistor R12 is connected with one end of a resistor R13 and a pin No. 3 of a rectifier bridge B4, the other end of the resistor R12 is connected with a cathode of a diode D14 and a pin No. 4 of a wiring terminal CN4, the other end of the resistor R13 is connected with an anode of the diode D14 and an anode of an electrolytic capacitor C11, and a cathode of the electrolytic capacitor C11 is connected with a pin No. 4 of the rectifier bridge B4 and a pin No. 5 of the wiring terminal CN 4.
No. 3 pin of the pulse transformer T5 is connected with No. 1 pin of the rectifier bridge B5, and No. 4 pin of the pulse transformer T5 is connected with No. 2 pin of the rectifier bridge B5. One end of a resistor R14 is connected with one end of a resistor R15 and a pin No. 3 of a rectifier bridge B5, the other end of the resistor R14 is connected with a cathode of a diode D15 and a pin No. 1 of a wiring terminal CN5, the other end of the resistor R15 is connected with an anode of the diode D15 and an anode of an electrolytic capacitor C12, and a cathode of the electrolytic capacitor C12 is connected with a pin No. 4 of the rectifier bridge B5 and a pin No. 2 of the wiring terminal CN 5.
No. 3 pin of the pulse transformer T6 is connected with No. 1 pin of the rectifier bridge B6, and No. 4 pin of the pulse transformer T6 is connected with No. 2 pin of the rectifier bridge B6. One end of a resistor R16 is connected with one end of a resistor R17 and a pin No. 3 of a rectifier bridge B6, the other end of the resistor R16 is connected with a cathode of a diode D16 and a pin No. 4 of a wiring terminal CN5, the other end of the resistor R17 is connected with an anode of the diode D16 and an anode of an electrolytic capacitor C13, and a cathode of the electrolytic capacitor C13 is connected with a pin No. 4 of the rectifier bridge B6 and a pin No. 5 of the wiring terminal CN 5.
The photoelectric isolation circuit 4 realizes the electric isolation of the pulse isolation trigger circuit 3 and an external control signal.
The specific circuit connection of the optoelectronic isolation circuit 4 is as follows:
a pin No. 1 of a wiring terminal CN1 is connected with a pin No. 2 of an optocoupler U5, a pin No. 3 of a wiring terminal CN1 is connected with one end of a resistor R3, and a pin No. 1 of an optocoupler U5 at the other end of the resistor R3 is connected; one end of the resistor R4 is connected with +15V, the other end of the resistor R4 is connected with a pin 4 of the optocoupler U5 and a pin 11 of a driver U4 in the MOSFET drive circuit 2, and a pin 3 of the optocoupler U5 is connected with GND.
The power supply circuit 5 provides the power required for the operation of the imofet driver circuit 2.
The specific circuit connection of the power supply circuit 5 is as follows:
pin No. 4 of connection terminal CN2 is connected to the anode of diode D5 and the cathode of diode D8, pin No. 3 of connection terminal CN2 is connected to the anode of diode D6 and the cathode of diode D9, and pin No. 2 of connection terminal CN2 is connected to the anode of diode D7 and D10.
The cathode of the diode D5, the cathode of the diode D6, the cathode of the diode D7 and the anode of the electrolytic capacitor C6 are connected with the drain of the MOSFET tube U1 in the MOSFET drive circuit 2;
the anode of the diode D8, the anode of the diode D9, the anode of the diode D10, the cathode of the electrolytic capacitor C7, the cathode of the electrolytic capacitor C14 and the pin No. 2 of the three-terminal regulator tube IC1 are connected with one end of the capacitor C15, and the other end of the capacitor C15 is connected with the pin No. 3 of the three-terminal regulator tube IC1, the anode of the capacitor C14 and + 15V; the negative electrode of the electrolytic capacitor C6, the positive electrode of the electrolytic capacitor C7, the pin No. 1 of the three-terminal voltage regulator tube IC1 are connected with the pin No. 1 of the pulse transformer T1, the pin No. 1 of the pulse transformer T3 and the pin No. 1 of the pulse transformer T5 in the pulse isolation trigger circuit 3.
The working principle of the invention is as follows:
the core part of the silicon controlled controller consists of an oscillator circuit, an MOSFET driver circuit and a pulse isolation trigger circuit. An oscillator circuit composed of a schmitt trigger 4584, a resistor and a capacitor is used to generate a pulse signal of about 20 kHz. The MOSFET driver circuit adopts IR2110 as a driver, changes a pulse signal generated by the oscillator circuit into a push-pull signal, and drives the two MOSFET tubes to be conducted in turn. And then the six controllable silicon are simultaneously triggered after being coupled and rectified by a pulse transformer through a pulse isolation trigger circuit, so that the conduction of a controllable silicon electronic switch is controlled, and the connection between the special frequency converter and a load motor is realized.
The working process of the invention is as follows:
the power supply circuit provides working power supply for the MOSFET driver circuit, and the photoelectric isolation circuit realizes the isolation of the pulse isolation trigger circuit and the external control circuit. The oscillator circuit generates a pulse signal of about 20kHz, the MOSFET driver circuit amplifies the power of the pulse signal of the oscillator circuit, the pulse signal is subjected to six paths of driving signals through the pulse isolation trigger circuit, and then the silicon controlled electronic switch is driven and controlled to realize the on-off control of the special frequency converter and the load motor.
The silicon controlled controller of the invention is already applied to special frequency converters with various power grades, and the maximum grade of output power exceeds 100 kW. The silicon controlled rectifier controller has the characteristics of high control speed, high efficiency, low cost, no spark, no noise and the like, is stable and reliable in control, realizes on-off control of the special frequency converter and the intermediate frequency silicon controlled rectifier electronic switch of the load motor, and meets the control requirement of on-off of the intermediate frequency voltage output by the special frequency converter.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The utility model provides a silicon controlled rectifier controller for converter which characterized in that: the pulse isolation trigger circuit comprises an oscillator circuit (1), an MOSFET (metal oxide semiconductor field effect transistor) driving circuit (2) and a pulse isolation trigger circuit (3) which are sequentially connected, wherein the MOSFET driving circuit (2) is respectively connected with a photoelectric isolation circuit (4) and a power supply circuit (5), and the pulse isolation trigger circuit (3) is connected with a silicon controlled electronic switch (6).
2. The silicon controlled controller for a frequency converter according to claim 1, characterized in that: the oscillator circuit (1) comprises a flip-flop, a resistor R5 and a capacitor C5 connected to each other.
3. The silicon controlled controller for a frequency converter according to claim 2, characterized in that: the oscillator circuit (1) generates a 20kHz pulse signal.
4. The silicon controlled controller for a frequency converter according to claim 2, characterized in that: the schmitt trigger is model number schmitt trigger 4584.
5. The silicon controlled controller for a frequency converter according to claim 1, characterized in that: the MOSFET driving circuit (2) comprises a driver and two MOSFET tubes respectively connected with the driver.
6. The silicon controlled controller for a frequency converter according to claim 5, characterized in that: the MOSFET driving circuit (2) changes a pulse signal generated by the oscillator circuit (1) into a push-pull signal, and drives the two MOSFET tubes to be conducted in turn.
7. The silicon controlled controller for a frequency converter according to claim 5, characterized in that: the driver is model IR 2110.
8. The silicon controlled controller for a frequency converter according to claim 1, characterized in that: the pulse isolation trigger circuit (3) comprises three groups of pulse transformer banks T1 and T2, T3 and T4 and T5 and T6 which are connected in series at the primary ends, wherein the three groups of pulse transformer banks are connected in parallel; each pulse transformer is respectively connected with a corresponding rectifier bridge.
9. The silicon controlled controller for a frequency converter according to claim 8, characterized in that: the pulse isolation trigger circuit (3) couples and rectifies the signal output by the MOSFET drive circuit (2) through a pulse transformer and then simultaneously triggers six controllable silicon so as to control the conduction of the controllable silicon electronic switch (6).
10. The silicon controlled controller for a frequency converter according to claim 1, characterized in that: the power supply circuit (5) comprises a three-phase bridge rectifier, an electrolytic capacitor and a three-end voltage-stabilizing tube, wherein the three-phase bridge rectifier consists of diodes D5-D7 and D8-D10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011395546.3A CN112350553A (en) | 2020-12-03 | 2020-12-03 | Silicon controlled rectifier controller for frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011395546.3A CN112350553A (en) | 2020-12-03 | 2020-12-03 | Silicon controlled rectifier controller for frequency converter |
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