CN103051156A

CN103051156A - Frequency converter

Info

Publication number: CN103051156A
Application number: CN2012101964467A
Authority: CN
Inventors: 张荣亮; 杨运海; 陈飞; 邓仉艺
Original assignee: Shenzhen Sine Electric Co Ltd
Current assignee: Shenzhen Sine Electric Co Ltd
Priority date: 2012-06-14
Filing date: 2012-06-14
Publication date: 2013-04-17

Abstract

The invention relates to the technical field of electrics and provides a frequency converter. The frequency converter comprises an upper case, a lower case, a circuit board and a power device, wherein the circuit board and the power device are arranged in a space surrounded by the upper case and the lower case, the power device comprises at least one first IGBT (insulated gate bipolar translator) and at least one capacitor and also comprises a heat radiator arranged in the lower case, the circuit board is arranged at the top of the heat radiator, the first IGBT is fixedly arranged at the side surface of the heat radiator, in addition, a lead pin of the first IGBT extends out from the top surface of the circuit board, and the capacitor is fixedly arranged on the circuit board and is arranged at one side of the first IGBT. In the frequency converter, the IGBT and the capacitor adopt the reasonable layout, the probability of overvoltage damage caused by stray inductance is reduced, the reliability of a system device is improved, and in addition, the internal structure of the frequency converter can be more compact, so the size is small, the cost is reduced, and the application range is expanded.

Description

Frequency converter

Technical field

The present invention relates to technical field of electricity, more particularly, relate to a kind of frequency converter.

Background technology

Frequency converter is power supply apparatus commonly used in the prior art.In frequency converter, contain a large amount of power devices, such as IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), bus capacitor, rectifier bridge, filter etc.When frequency converter is carried out structural design, to consider the impact between each device based on the performance of each power device self, the ventilation and heat performance of system, the factors such as the reasonable compactedness of structure and installation and maintenance, thus the frequency converter of performance index the best obtained.

But, various frequency converter of the prior art, owing to there being the factors such as device is many, each device volume is large, when actual design, often do not reach above-mentioned Theoretical Design requirement, the ubiquity volume is large, system configuration is complicated, the defectives such as loaded down with trivial details are installed, and this not only is not easy to the production of frequency converter, and the performance of frequency converter is also unreliable, and operation and maintenance of its postorder etc. is all brought certain impact.

Summary of the invention

Technical problem to be solved by this invention is to overcome the defective of prior art, provides a kind of topology layout reasonable, and system reliability is good, is convenient to the frequency converter of installation and maintenance.

For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of frequency converter is provided, comprise upper casing, lower casing and be located at described upper casing and the lower casing enclosed space in circuit board and power device, described power device comprises an at least one IGBT and at least one capacitor element, be provided with a radiator in the described lower casing, described circuit board is located at described radiator top, a described IGBT is fixed in the side of described radiator, and the pin of a described IGBT is stretched out by the end face of described circuit board, described capacitor element is fixed on the described circuit board, and places the side of a described IGBT.

Particularly, a described IGBT is a plurality of, and is arranged in a linear.

Further, each described IGBT all is fixed on the described radiator by the first potsherd.

Particularly, described capacitor element is a plurality of, be arranged in a linear, and parallel with each described IGBT.

Further, described lower casing has container cavity, is provided with the rib that it is divided into the first chamber and the second chamber in the described container cavity, and described radiator and a described IGBT place in described the first chamber, and described capacitor element places in described the second chamber.

Further, the front end of described the first chamber is provided with an opening, and described opening part is provided with blower fan, and the described blower fan outside is provided with a fan cover that can be fixed.

Further, the end face of described radiator is provided with the support column for fixing described circuit board, is provided with overhead space between the end face of described circuit board and described radiator.

Particularly, described power device also comprises rectifier bridge, heat sensor and the metal-oxide-semiconductor that is positioned at described overhead space and fixes with described radiator.

Particularly, described power device also comprises the 2nd IGBT that is positioned at described overhead space, and described the 2nd IGBT is fixed on the described radiator by the second potsherd.

Further, the top of described upper casing is provided with the operation interface that is connected with described circuit board.

Among the present invention, with IGBT and capacitor element rational deployment, not only reduced the probability of the overvoltage damage that causes because of stray inductance, improved system's component reliability, and made the frequency converter internal structure compacter, thus its volume miniaturization, reduce cost, enlarged application.

Description of drawings

Fig. 1 is the structural representation of frequency converter one preferred embodiment provided by the invention;

Fig. 2 is the explosive view of Fig. 1;

Fig. 3 is that frequency converter is removed structural representation behind upper casing and the lower casing in the embodiment of the invention;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is the rearview of Fig. 3.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

With reference to Fig. 1, Fig. 2, frequency converter provided by the invention, comprise upper casing 100, lower casing 200 and be located at circuit board 300 and power device 400 in upper casing 100 and lower casing 200 enclosed spaces, power device 400 comprises an at least one IGBT410 and at least one capacitor element 420, be provided with a radiator 500 in the lower casing 200, circuit board 300 is located at radiator 500 tops, the one IGBT410 is fixed in the side of radiator 500, and the pin of an IGBT410 is stretched out by the end face of circuit board 300, capacitor element 420 is fixed on the circuit board 300, and places the side of an IGBT410.

In Design of Inverter, because positive and negative loop spacing is excessive in the long or current loop of electric current loop distance, can cause stray inductance.And the switching frequency of IGBT is higher, when opening, will produce very large voltage Ldi/dt when IGBT turn-offs, and has influence on IGBT410.The outside stray inductance L of IGBT mainly refers to the DC side inductance of IGBT, can be regarded as thus to such an extent that L on the impact that is added in the collection radio pressure on the IGBT is:

U wherein _dBe direct voltage electric capacity,

Current changing rate for IGBT.The voltage that stray inductance L produces is superimposed upon U _dOn, because IGBT inside is integrated circuit (IC) chip, voltage endurance capability is very limited, the voltage that produces as stray inductance L is larger, exceeds withstand voltage U between collector electrode-emitter of IGBT _CESThe time, the overvoltage that produce this moment can puncture IGBT easily.And when IGBT was turn-offing, owing to having inductance in the circuit, shutdown moment produced peak voltage, surpassed the peak-peak voltage of IGBT when voltage, may cause IGBT to puncture.And in the present embodiment, capacitor element 420 is fixed on the circuit board 300, and be located at an IGBT410 one side, like this, the shortest by capacitor element 420 formed bus rods and the formed current loop distance of an IGBT410, simultaneously this layout also at utmost realizes by making in the loop reversal spacing at circuit board 300 fabric swatch recently and farthest overlapping up and down.Like this, effectively reduce stray inductance, realize the protection to an IGBT410, also make the frequency converter internal structure compacter simultaneously, thereby realize its volume miniaturization, reduce cost, enlarged application.

With reference to Fig. 2, an IGBT410 is structure in the form of sheets, and vertically arranges, and pin upwards like this, can guarantee that an IGBT410 and radiator side better fit.In the present embodiment, an IGBT410 quantity is 6, and is arranged in a linear.Certainly, an IGBT410 also can be other quantity.

Further, each IGBT410 all is fixed on the radiator 500 by the first potsherd 600.Three blocks of first potsherds 600 are arranged in the present embodiment, each first potsherd 600 is provided with two installing holes 610, the upper correspondence of each IGBT410 is provided with an installing hole 411, like this, be arranged in installing hole 411 by screw 700 and installing hole 620 is fixed in an IGBT410 and the first potsherd 600 on the side of radiator 500.Wherein, first potsherd 600 is corresponding with two IGBT410.Certainly, also can only adopt the first potsherd 600 of a strip to get final product.Here, utilize the insulating effect of the first potsherd 600, the conductive contact between an isolated IGBT410 and the radiator 500, the first potsherd 600 also plays the effect of transferring heat simultaneously.

Among Fig. 2, capacitor element 420 is 4, be arranged in a linear, and parallel with an IGBT410.Particularly, in the present embodiment, capacitor element 420 is dc-link capacitance, and it is cylindrical-shaped structure, is installed on an edge of circuit board 300, and just is positioned at the side of an IGBT410 of radiator 500 sides, and parallel with an IGBT410.

In the present embodiment, lower casing 200 has container cavity 210, is provided with the rib 220 that it is divided into the first chamber 211 and the second chamber 212 in the container cavity 210.Particularly, the size of the size of the first chamber 211 and radiator 500 is complementary, and the second chamber to 212 is positioned at the first chamber 211 1 sides.When radiator 500 and circuit board 300 placed lower casing 200, radiator 500 and an IGBT410 placed in the first chamber 211, and four capacitor elements 420 place in the second chamber 212.Like this, by separating two chambers, an IGBT410 and capacitor element 420 are effectively isolated, and form airtight separately space and play dustproof and heat-blocking action.

Further, the front end of the first chamber 211 is provided with an opening 2111, and opening 2111 places are provided with blower fan 800, and blower fan 800 outsides are provided with a fan cover that can be fixed 810.Spacing between blower fan 800 and the radiator 500 is at 8-15mm.Like this, the moving air that forms during blower fan 800 work is the radiator 500 in opening 2111 places act on the first chamber 211 directly, so that the heat on the radiator 500 can distribute fast, thereby be beneficial to distributing of each power device heat on the radiator 500, guarantee the reliability service of each power device.

Further, with reference to Fig. 3 to Fig. 5, in the present embodiment, the end face of radiator 500 is provided with the support column 510 for fixing circuit board 300, is provided with overhead space 520 between the end face of circuit board 300 and radiator 500.Power device 400 also comprises rectifier bridge 430, heat sensor 440 and the metal-oxide-semiconductor 450 that is positioned at overhead space 520 and fixes with radiator 500.Wherein, rectifier bridge 430 is rectified into DC power supply with AC power, and heat sensor 440 is used for responding in real time the temperature of radiator 500, and metal-oxide-semiconductor 450 then participation provides the accessory power supply of system.Adopt this overhead space that each power device is set, avoid each power device directly to contact with circuit board 300 and cause the electrical safety problem, simultaneously, also play preferably result of ventilating heat dissipation.

Further, in the present embodiment, power device 400 also comprises the 2nd IGBT460 that is positioned at overhead space 520, and described the 2nd IGBT460 is fixed on the radiator 500 by the second potsherd 900.Herein; the 2nd IGBT460 is mainly used in overvoltage protection is implemented in the power inverting loop; and 6 above-mentioned IGBT410 are mainly used in the current inversion output to the power inverting loop; the 2nd IGBT460 that therefore, will be different from an IGBT410 places and more helps the equiblibrium mass distribution of elevator system pyrotoxin and the compactedness of total herein.

In the present embodiment, the top of upper casing 100 is provided with the operation interface 110 that is connected with circuit board 300.Like this, by operation interface, realize input and the output of human-machine interactive information, convenient adjustment to converter parameter.

Below only be preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims

1. frequency converter, comprise upper casing, lower casing and be located at described upper casing and the lower casing enclosed space in circuit board and power device, described power device comprises an at least one IGBT and at least one capacitor element, it is characterized in that: be provided with a radiator in the described lower casing, described circuit board is located at described radiator top, a described IGBT is fixed in the side of described radiator, and the pin of a described IGBT is stretched out by the end face of described circuit board, described capacitor element is fixed on the described circuit board, and places the side of a described IGBT.

2. frequency converter as claimed in claim 1, it is characterized in that: a described IGBT is a plurality of, and is arranged in a linear.

3. frequency converter as claimed in claim 2, it is characterized in that: each described IGBT all is fixed on the described radiator by the first potsherd.

4. frequency converter as claimed in claim 2, it is characterized in that: described capacitor element is a plurality of, be arranged in a linear, and parallel with each described IGBT.

5. such as each described frequency converter in the claim 1 to 4, it is characterized in that: described lower casing has container cavity, be provided with the rib that it is divided into the first chamber and the second chamber in the described container cavity, described radiator and a described IGBT place in described the first chamber, and described capacitor element places in described the second chamber.

6. frequency converter as claimed in claim 5, it is characterized in that: the front end of described the first chamber is provided with an opening, and described opening part is provided with blower fan, and the described blower fan outside is provided with a fan cover that can be fixed.

7. frequency converter as claimed in claim 1 is characterized in that: the end face of described radiator is provided with the support column for fixing described circuit board, is provided with overhead space between the end face of described circuit board and described radiator.

8. frequency converter as claimed in claim 7 is characterized in that: described power device also comprise be positioned at described overhead space and with fixing rectifier bridge, heat sensor and the metal-oxide-semiconductor of described radiator.

9. such as claim 7 or 8 described frequency converters, it is characterized in that: described power device also comprises the 2nd IGBT that is positioned at described overhead space, and described the 2nd IGBT is fixed on the described radiator by the second potsherd.

10. frequency converter as claimed in claim 1, it is characterized in that: the top of described upper casing is provided with the operation interface that is connected with described circuit board.