CN209562398U - A kind of frequency converter - Google Patents

Abstract

The utility model relates to converter technology fields, disclose a kind of simple and safe frequency converter of structure, with the ontology for installing IGBT module, blower is equipped at the top of ontology, symmetrical ventilation hole is equipped in the two sides of ontology, blower accelerates the radiating rate to IGBT module by ventilation hole, cover board is equipped at the top of blower, wherein, it is formed in the side at the top of ontology fluted, rectangular through-hole is equipped in the opposite side of groove, lug boss is formed in the lower part of the side of cover board, fastener is equipped in the other side of cover board, lug boss and fastener are respectively embedded into groove and through-hole, so that cover plate lid is closed at the top of ontology.

Description

A kind of frequency converter

Technical field

The utility model relates to converter technology fields, more specifically to a kind of frequency converter.

Background technique

Frequency converter (Variable-frequency Drive, VFD) is using converter technique and microelectric technique, by changing The mode of power transformation machine working power frequency controls the electric control appliance of ac motor.Frequency converter is mainly by rectifying (exchange Inversion of direct current), filtering, inversion (direct current become exchange), the composition such as brake unit.Frequency converter IGBT (Insulated Gate close to the inner portion Bipolar Transistor, insulated gate bipolar transistor) mould group on or off with adjust out-put supply voltage and Frequency, supply voltage required for providing it according to the actual needs of motor, and then achieve the purpose that energy conservation, speed regulation.With The continuous improvement of industrial automatization, frequency converter have been widely used.Therefore, how design structure simply becomes Frequency device is pressing issue.

Utility model content

The technical problems to be solved in the utility model is providing a kind of simple frequency converter of structure.

The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of frequency converter, have for pacifying The ontology for filling IGBT module, is equipped with blower at the top of the ontology, is equipped with symmetrical ventilation hole, institute in the two sides of the ontology Radiating rate of the blower by ventilation hole quickening to the IGBT module is stated,

The top of the blower be equipped with cover board, wherein formed in the side at the top of the ontology it is fluted, described The opposite side of groove is equipped with rectangular through-hole, lug boss is formed in the lower part of the side of the cover board, in the other side of the cover board Equipped with fastener, the lug boss and the fastener are respectively embedded into the groove and the through-hole, so that the cover plate lid is closed in institute State the top of ontology.

Optionally, it is equipped with pedestal in the bottom of the ontology, the pedestal is separably attached with the ontology.

Optionally, front shroud is installed in the front end of the ontology, the front shroud is for covering the front side for closing the ontology.

Optionally, the downside of the ontology be equipped with switching switch, it is described switching switch for switch input electric current or Voltage.

Optionally, diode, the anode of the diode and the IGBT are connected in the input terminal of the IGBT module The negative input end of module connects, and the cathode of the diode is coupled to the positive input terminal of the IGBT module, and the diode is used In the signal reversal connection for preventing from inputting the IGBT module, with IGBT module described in anti-tamper.

In frequency converter described in the utility model, it is equipped with IGBT module in ontology, is equipped with blower at the top of ontology And cover board, and it is equipped with symmetrical ventilation hole in the two sides of ontology, blower carries out acceleration heat dissipation to IGBT module by ventilation hole, from And effectively improve heat dissipation effect.Wherein, formed in the side at the top of ontology it is fluted, the opposite side of groove be equipped with it is rectangular Through-hole forms lug boss in the lower part of the side of cover board, is equipped with fastener in the other side of cover board, lug boss and fastener are respectively embedded into Groove and through-hole, so that cover plate lid is closed at the top of ontology.Compared with existing frequency converter, the most structure of the utility model The buckle that connection uses is fixed, so that the connection structure of frequency converter is relatively simple, when maintenance dismantles more convenient.

Detailed description of the invention

Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:

Fig. 1 is the schematic perspective view of frequency converter；

Fig. 2 is the front cover structure schematic diagram of frequency converter；

Fig. 3 is the connection schematic diagram of IGBT module.

Specific embodiment

For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed Illustrate specific embodiment of the present utility model.

Fig. 1 is the schematic perspective view of frequency converter, and Fig. 2 is the front cover structure schematic diagram of frequency converter.Institute as shown in Figure 1, Figure 2 Show, frequency converter mainly includes ontology 10, pedestal 20 and front shroud 30.Specifically, the shape of ontology 10 is the structure of cuboid, Inside is engraved structure, is equipped with blower 106 at the top of ontology 10.Wherein, blower 106 is fixed on by ontology 10 by screw It is interior.It is equipped with symmetrical ventilation hole 11 in the two sides of ontology 10, blower 106 is used cooperatively with ventilation hole 11, can accelerate frequency converter The flowing velocity of inner air, reducing IGBT module 12, (IGBT module is mounted on the inside of frequency converter, and IGBT is not shown in Fig. 1 The specific location of module) and aluminium sheet temperature.

Further, cover board 107 is equipped at the top of blower 106.Specifically, it is formed in the side at the top of ontology 10 Groove 108a is equipped at least one rectangular through-hole 109a in the opposite side of groove 108a.Further, in the side of cover board 107 Lower part formed lug boss 108b, the other side of cover board 107 be equipped with fastener 109b.Specifically, when installation, by cover board 107 Lug boss 108b and fastener 109b are respectively clamped into the groove 108a and through-hole 109a of ontology 10, so that cover board 107 is more firm Ground is mounted on ontology 10.Wherein, by the connection of buckle, the flexibility that cover board 107 and ontology 10 are installed can be promoted, to blower 106 and internal ventilation hole when being cleared up, can be then laterally moved out by fastener 109b again by lug boss 108b pull-up, It operates relatively simple.

It in the present embodiment, can be in the bottom mounting seat 20 of ontology 10 in order to improve the convenience that frequency converter loads and unloads. The centre of pedestal 20 is sunk structure, at least provided with two pieces of partitions 201 at recessed position, in the top edge of the two sides of pedestal 20 It is formed with symmetrical protrusion buckle.When installation, by buckle insertion 10 groove body of ontology, pedestal 20 is fixed by snap in ontology 10 Bottom, wherein pedestal 20 is separably attached with ontology 10.

As shown in connection with fig. 2, rectangular front shroud 30 is installed in the front end of ontology 10 and (front shroud 30 is not shown in Fig. 1 Specific location).Wherein, the top of front shroud 30 is equipped with perspex piece moving up and down, is equipped in the downside of sheet Rotary switch 301.Specifically, it being equipped with hinged block in the side of front shroud 30, front shroud 30 is connect by hinged block with ontology 10, Lid is closed in the front side of ontology 10.

In the present embodiment, in order to improve the adjustability of inverter input signal, it can be equipped with and cut in the downside of ontology 10 Change switch 101.Specifically, switching switch 101 is connect with the control circuit in frequency converter, for switching input IGBT module 12 Current or voltage changes the amplitude and frequency of output voltage by the conducting and cut-off of IGBT module 12.

Further, it is equipped with PU interface 102 in the side of switching switch 101, is used to connect the operating unit of frequency converter, Connected using PU interface 102 with communication cable and computer, on computers work out user program realize to frequency converter into The operation such as the monitoring of row operating status, the setting of running frequency, starting and stopping.

Further, power supply terminal 103 is equipped in the side of PU interface 102.Wherein, power supply terminal 103 For connecting with externally input power supply and internal operating unit, the interaction between power supply is realized by power supply terminal 103. Wherein, partition 201 is isolated by the connecting terminal of power supply terminal 103, to improve the safety of input terminal power supply.

Control unit connecting terminal 104 is equipped in the top of power supply terminal 103.Wherein, in control unit terminals Son 104 is equipped with multiple ports I/O.

Further, display panel 105 is equipped in the top of control unit connecting terminal 104.The signal of display panel 105 Input terminal and the signal output end of control unit connect, the operational order for display control unit input.

Fig. 3 is the connection schematic diagram of IGBT module.As shown in figure 3, IGBT module 12 has switching characteristic, wherein IGBT Switching characteristic be divided into two large divisions: first is that switching speed, main indicator is the time of each section in switching process；The other is Loss in switching process.Specifically, the switching characteristic of IGBT refers to the relationship between drain current and drain-source voltage.In IGBT The input terminal of module 12 is connected with diode D1.

Diode D1 has the function of rectification, afterflow.Specifically, the anode of diode D1 and the cathode of IGBT module 12 are defeated Enter end connection, the cathode of diode D1 is coupled to the electrode input end of IGBT module 12.By the conducting direction of diode D1 it is found that The conducting direction of diode D1 is directed toward the cathode of diode D1 from the anode of diode D1.Therefore, when the anode of IGBT module 12 When input terminal is connected to the anode of direct current input, the circulating direction of electric current is identical as the conducting direction of diode D1, therefore, direct current Input can be with 12 normally of IGBT module.When the electrode input end of IGBT module 12 is connected to the cathode of direct current input, Since sense of current is different from the conducting direction of diode D1, at this point, diode D1 is equivalent to circuitry cuts, so that input The electric current of IGBT module 12 can not form complete circuit.At this point, direct current input can not power to IGBT module 12, to realize Protection to IGBT module 12.

In addition, direct current input can be realized by different devices in specific connection, it both can be DC power supply, Or the direct current transducer of AC to DC, it can be using in the present embodiment.In a specific embodiment, The input terminal of IGBT module 12 is connected with DC power supply by diode D1, provides driving signal for IGBT module 12.

Resistance and capacitor are connected in the output end of IGBT module 12.Wherein, resistance and capacitor form resistance-capacitance circuit, tool There are filtering and current limliting.Specifically, on each resistance-capacitance circuit at least provided with two resistance and capacitor, and resistance and capacitor Parameter and capacity can satisfy electric current output demand.

The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to The specific embodiment stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model Under, many forms can be also made, these are belonged within the protection of the utility model.

Claims (5)

1. a kind of frequency converter, which is characterized in that there is the ontology for installing IGBT module, be equipped with wind at the top of the ontology Machine is equipped with symmetrical ventilation hole in the two sides of the ontology, and the blower is accelerated by the ventilation hole to the IGBT module Radiating rate,

The top of the blower be equipped with cover board, wherein formed in the side at the top of the ontology it is fluted, in the groove Opposite side be equipped with rectangular through-hole, the side of the cover board lower part formed lug boss, be equipped in the other side of the cover board Fastener, the lug boss and the fastener are respectively embedded into the groove and the through-hole, so that the cover plate lid is closed at described The top of body.

2. frequency converter according to claim 1, which is characterized in that be equipped with pedestal, the pedestal in the bottom of the ontology It is separably attached with the ontology.

3. frequency converter according to claim 2, which is characterized in that front shroud is installed in the front end of the ontology, it is described Front shroud is for covering the front side for closing the ontology.

4. frequency converter according to claim 3, which is characterized in that it is equipped with switching switch in the downside of the ontology, it is described Switching switch is for switching the current or voltage of input.

5. frequency converter according to claim 1, which is characterized in that be connected with two poles in the input terminal of the IGBT module Pipe, the anode of the diode are connect with the negative input end of the IGBT module, and the cathode of the diode is coupled to described The positive input terminal of IGBT module, the diode is used to prevent from inputting the signal reversal connection of the IGBT module, described in anti-tamper IGBT module.