CN209299172U - A kind of switch controlling device and frequency converter of frequency conversion output - Google Patents
A kind of switch controlling device and frequency converter of frequency conversion output Download PDFInfo
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- CN209299172U CN209299172U CN201822001355.9U CN201822001355U CN209299172U CN 209299172 U CN209299172 U CN 209299172U CN 201822001355 U CN201822001355 U CN 201822001355U CN 209299172 U CN209299172 U CN 209299172U
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Abstract
The utility model embodiment proposes the switch controlling device and frequency converter of a kind of frequency conversion output, which includes: inverter bridge, capacitor, first diode, relay, control panel；Wherein, the control panel connects the relay, to control the switch of the relay；The relay and the first diode and company；The anode of the first diode connects the inverter bridge, the anode of the cathode connection external power supply of the first diode；The anode of the capacitor connects the anode of the external power supply, the cathode ground connection of the capacitor.By the series relay between inverter bridge and power supply, and it is provided with the control panel of control relay, relay switch is controlled by control panel, to indirectly control the on/off of inverter bridge, power supply directly is controlled from source, it is reliable and stable, and device quantity is few, saves space and cost.
Description
Technical Field
The utility model relates to a circuit on-off control device field, in particular to on-off control device and converter of frequency conversion output.
Background
In the field of electrical control, when external electrical equipment such as a motor is connected, the high-voltage condition is particularly involved, for example, an integrated elevator control system has high requirements on reliability and safety, and at present, a contactor is generally adopted between a three-phase output of a frequency converter and a three-phase motor to control the on-off of a power supply.
Therefore, a control method which not only meets the requirements of reliability and safety, but also saves space and cost is urgently needed in the specific fields of elevator control and the like.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a frequency conversion output's on-off control device and converter, through the series connection relay between contravariant bridge and power, and be provided with the control panel of control relay, through the switch of control panel control relay to the power break-make of indirect control contravariant bridge directly follows the source control power, and reliable and stable, and the device is small in quantity, practices thrift space and cost.
Specifically, the utility model provides a following specific embodiment:
the embodiment of the utility model provides a frequency conversion output's on-off control device, include: the inverter bridge, the capacitor, the first diode, the relay and the control panel; wherein,
the control board is connected with the relay and used for controlling the switch of the relay;
the relay is connected with the first diode in parallel;
the anode of the first diode is connected with the inverter bridge, and the cathode of the first diode is connected with the anode of an external power supply;
the positive pole of the capacitor is connected with the positive pole of the external power supply, and the negative pole of the capacitor is grounded.
In a specific embodiment, the capacitor is specifically: a filter capacitor; the first diode is a freewheeling diode.
In a particular embodiment, the inverter bridge comprises a three-phase bridge module; the three-phase bridge module includes: three upper bridge arm IGBT tubes and three lower bridge arm IGBT tubes; the collector electrodes of the IGBT tubes of the upper bridge arm are connected with the anode of the first diode and are connected to one end of the output contact of the relay;
the emitting electrodes of the upper bridge arm IGBT tubes are connected with the collecting electrodes of the lower bridge arm IGBT tubes, and the emitting electrodes of the upper bridge arm IGBT tubes are used for connecting a three-phase load;
the grid electrodes of the three upper bridge arm IGBT tubes are respectively connected with an upper bridge arm three-phase control signal;
the grid electrodes of the three lower bridge arm IGBT tubes are respectively connected with a lower bridge arm three-phase control signal;
and the emitting electrodes of the three lower bridge arm IGBT tubes are connected with the negative electrode of the capacitor.
In a particular embodiment of the present invention,
the upper bridge arm IGBT module and the lower bridge arm IGBT module are consistent in structure.
In a specific embodiment, the upper bridge arm IGBT module and the lower bridge arm IGBT module each include an IGBT and a second diode;
wherein the anode of the second diode is connected with the emitter of the IGBT; and the cathode of the second diode is connected with the collector of the IGBT.
In a specific embodiment, the second diode is specifically a reverse diode.
The embodiment of the utility model provides a still provide a converter, include the on-off control device who outputs like this frequency conversion.
Therefore, the embodiment of the utility model provides a switch control device and converter of frequency conversion output is provided, the device includes: the inverter bridge, the capacitor, the first diode, the relay and the control panel; the control board is connected with the relay and used for controlling the switch of the relay; the relay is connected with the first diode in parallel; the anode of the first diode is connected with the inverter bridge, and the cathode of the first diode is connected with the anode of an external power supply; the positive pole of the capacitor is connected with the positive pole of the external power supply, and the negative pole of the capacitor is grounded. Through the relay that establishes ties between inverter bridge and power, and be provided with the control panel of control relay, through the switch of control panel control relay to the power break-make of indirect control inverter bridge directly follows the source control power, and is reliable and stable, and the device is small in quantity, practices thrift space and cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a switching control device with variable frequency output according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a switching control device with variable frequency output according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an upper bridge arm IGBT module or a lower bridge arm IGBT module in the switching control device with variable frequency output according to an embodiment of the present invention.
Illustration of the drawings:
1-inverter bridge; 11-a second diode; 12-IGBT;
2-capacitance; 3-a relay; 4-control panel;
5-a contactor; 6-first diode.
Detailed Description
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
The terminology used in the various embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present disclosure belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined in various embodiments of the present disclosure.
Example 1
Embodiment 1 of the utility model discloses a switch control device of frequency conversion output, as shown in fig. 1 and fig. 2, include: the inverter bridge comprises an inverter bridge 1, a capacitor 2, a relay 3, a control board 4 and a first diode 6; wherein,
the control board 4 is connected with the relay 3 and used for controlling the on-off of the relay 3;
the relay 3 is connected in parallel with the first diode 6;
the anode of the first diode 6 is connected with the inverter bridge 1, and the cathode of the first diode 6 is connected with the anode of an external power supply;
the positive pole of the capacitor 2 is connected with the positive pole of the external power supply, and the negative pole of the capacitor 2 is grounded.
Specifically, in the control process, for example, the output end of the inverter bridge 1 is connected with an electric device, such as a motor, under the condition, the on and off of the relay 3 is controlled by the control board 4, and then, when the relay 3 is in the on state, the power supply path of the inverter bridge 1 is enabled, so that the output can be performed, and the external motor is connected, so that the motor starts to work; when the relay 3 is in the off state, the power circuit of the inverter bridge 1 is also disconnected, the inverter bridge 1 has no power input and no output, and further, an external motor, for example, cannot be started to work, so that the on and off of the inverter bridge 1 and the power supply are controlled through the arrangement of the control board 4 and the relay 3, and finally whether an externally connected electric device works is controlled.
Specifically, the first diode 6 is a freewheeling diode, and is connected to two ends of the relay 3 in parallel to form a loop with the first diode, so that high electromotive force generated at the moment when the relay 3 is disconnected charges the capacitor 2 in a continuous current manner in the loop, thereby protecting elements in the whole circuit from being damaged.
The specific control board 4 may be a control device generally used at present for controlling the relay 3, or may be a power supply device (generating a small current to control the on/off of the relay 3).
The power supply is directly controlled from the source in the scheme, the scheme is stable and reliable, the number of related devices is small, and the space and the cost are saved.
Specifically, as shown in fig. 2, the inverter bridge includes a three-phase bridge module; the IGBT tubes of the upper bridge arm in the three-phase bridge module are connected with a direct-current bus power supply through a relay U1, and the three-phase power supply U, V, W with variable output frequency and voltage is generated by controlling the on and off of the upper and lower bridge arms of the three-phase output. A relay switch contact is added between the bus power supply and the inverter bridge, and when the contact is disconnected, the three-phase output U, V, W has no power supply output.
In a specific application scenario, after the control board receives a running instruction, the control board controls the outputs of Y1 and X1 to control the conduction of P0+ and P1+ after the U1 relay is powered on, so as to control the connection of the three-phase bridge module and the power supply, start working and output a three-phase power supply (U phase, V phase and W phase respectively), and further start working of the motor. And after the control board receives the stop command, the control board controls Y1 and X1 to stop outputting, so that the U1 relay contact is disconnected, and the three phases of the three-phase bridge module also stop outputting, thereby realizing the control of switching on and switching off.
In a specific embodiment, as shown in fig. 2, the capacitor 2 is specifically: and a filter capacitor.
In a specific embodiment, as shown in fig. 2, the three-phase bridge module includes: three upper bridge arm IGBT tubes and three lower bridge arm IGBT tubes; the collector electrodes of the IGBT tubes of the upper bridge arm are connected with the anode of the first diode 6 and connected with one end of the output contact of the relay;
the emitting electrodes of the upper bridge arm IGBT tubes are connected with the collector electrodes of the lower bridge arm IGBT tubes, and the emitting electrodes of the upper bridge arm IGBT tubes are used for connecting a three-phase load,
the grid electrodes of the three upper bridge arm IGBT tubes are respectively connected with an upper bridge arm three-phase control signal;
the grid electrodes of the three lower bridge arm IGBT tubes are respectively connected with a lower bridge arm three-phase control signal;
and the emitting electrodes of the three lower bridge arm IGBT tubes are connected with the negative electrode of the capacitor 2.
As shown in fig. 2, the three-phase bridge module includes: three upper bridge arm IGBT (Insulated Gate bipolar transistor) tubes (corresponding to K1, K3, and K5 in fig. 2, respectively) and three lower bridge arm IGBT tubes (corresponding to K2, K4, and K6 in fig. 2, respectively); and the collector electrodes of the IGBT tubes of the upper bridge arm are connected with the anode of the first diode 6 and one end of the output contact of the relay.
The emitting electrodes of the upper bridge arm IGBT tubes are connected with the collecting electrodes of the lower bridge arm IGBT tubes, and meanwhile the emitting electrodes of the upper bridge arm IGBT tubes are used for connecting a three-phase load (for example, as shown in FIG. 2, the three-phase load comprises a U phase, a V phase and a W phase).
The grid electrodes of the three upper bridge arm IGBT tubes are respectively connected with upper bridge arm three-phase control signals (for example, as shown in the figure)2, includes Vup，Vvp，Vwp)；
The gates of the three lower bridge arm IGBT tubes are respectively connected with a lower bridge arm three-phase control signal (for example, as shown in FIG. 2, the three lower bridge arm IGBT tubes comprise VunVvn，Vwn)；
And the emitting electrodes of the three lower bridge arm IGBT tubes are connected with the negative electrode of the capacitor 2.
In a specific embodiment, as shown in fig. 2, the upper arm IGBT module and the lower arm IGBT module have the same structure.
In a specific embodiment, the upper arm IGBT module and the lower arm IGBT module each include an IGBT12 and a second diode 11;
wherein the anode of the second diode 11 is connected to the emitter of the IGBT 12; the cathode of the second diode 11 is connected to the collector of the IGBT 12.
In a specific embodiment, as shown in fig. 2 and 3, the upper arm IGBT tube and the lower arm IGBT tube each include an Insulated Gate Bipolar Transistor (IGBT) 12 and a second diode 11 for current continuity.
In a specific embodiment, the second diode 11 is embodied as a backward diode.
Example 2
The embodiment 2 of the utility model also discloses a frequency converter, including above-mentioned embodiment 1 the on-off control device of frequency conversion output.
Specifically, please refer to the description in embodiment 1 above for the description of the switching control device for variable frequency output, which is not repeated herein.
Therefore, the embodiment of the utility model provides a switch control device and converter of frequency conversion output is provided, the device includes: the inverter bridge comprises an inverter bridge 1, a capacitor 2, a relay 3, a control board 4 and a first diode 6; the control board 4 is connected with the relay 3 and used for controlling the on-off of the relay 3; the relay 3 is connected in parallel with the first diode 6; the anode of the first diode 6 is connected with the inverter bridge 1, and the cathode of the first diode 6 is connected with the anode of an external power supply; the positive pole of the capacitor 2 is connected with the positive pole of the external power supply, and the negative pole of the capacitor 2 is grounded. Through the series connection relay 3 between inverter bridge 1 and the power, and be provided with control relay 3's control panel 4, through control panel 4 control relay 3's switch to indirect control inverter bridge 1's power break-make directly follows the source control power, and reliable and stable, and the device is small in quantity, practices thrift space and cost.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenario.
The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
Claims (7)
1. A switching control device for variable frequency output is characterized by comprising: the inverter bridge, the capacitor, the first diode, the relay and the control panel; wherein,
the control board is connected with the relay and used for controlling the switch of the relay;
the relay is connected with the first diode in parallel;
the anode of the first diode is connected with the inverter bridge, and the cathode of the first diode is connected with the anode of an external power supply;
the positive pole of the capacitor is connected with the positive pole of the external power supply, and the negative pole of the capacitor is grounded.
2. The switching control device of a variable frequency output according to claim 1, wherein the capacitor is specifically: a filter capacitor; the first diode is a freewheeling diode.
3. The apparatus of claim 1, wherein said inverter bridge comprises a three-phase bridge module;
the three-phase bridge module includes: three upper bridge arm IGBT tubes and three lower bridge arm IGBT tubes; the collector electrodes of the IGBT tubes of the upper bridge arm are connected with the anode of the first diode and are connected to one end of the output contact of the relay;
the emitting electrodes of the upper bridge arm IGBT tubes are connected with the collector electrodes of the lower bridge arm IGBT tubes, and the emitting electrodes of the upper bridge arm IGBT tubes are used for connecting a three-phase load,
the grid electrodes of the three upper bridge arm IGBT tubes are respectively connected with an upper bridge arm three-phase control signal;
the grid electrodes of the three lower bridge arm IGBT tubes are respectively connected with a lower bridge arm three-phase control signal;
and the emitting electrodes of the three lower bridge arm IGBT tubes are connected with the negative electrode of the capacitor.
4. A switching control device of a variable frequency output according to claim 3,
the upper bridge arm IGBT module and the lower bridge arm IGBT module are consistent in structure.
5. The switching control device of a variable frequency output according to claim 3, wherein the upper arm IGBT module and the lower arm IGBT module each comprise an IGBT and a second diode;
wherein the anode of the second diode is connected with the emitter of the IGBT; and the cathode of the second diode is connected with the collector of the IGBT.
6. A switching control device of a variable frequency output according to claim 5, characterized in that said second diode is embodied as a reverse diode.
7. A frequency converter comprising a switching control device of a variable frequency output according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822001355.9U CN209299172U (en) | 2018-11-30 | 2018-11-30 | A kind of switch controlling device and frequency converter of frequency conversion output |
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| CN201822001355.9U CN209299172U (en) | 2018-11-30 | 2018-11-30 | A kind of switch controlling device and frequency converter of frequency conversion output |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617493A (en) * | 2018-11-30 | 2019-04-12 | 展鹏科技股份有限公司 | A kind of switch controlling device and frequency converter of frequency conversion output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109617493A (en) * | 2018-11-30 | 2019-04-12 | 展鹏科技股份有限公司 | A kind of switch controlling device and frequency converter of frequency conversion output |
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