CN213240305U - Novel three-phase current sampling device - Google Patents

Abstract

The utility model discloses a novel three-phase current sampling device, which comprises a shell, wherein an upper cover plate is arranged above the shell, and a sampling component is arranged inside the shell; the sampling assembly comprises a first circuit board, a second circuit board, a three-phase drive bridge circuit unit, a sampling trigger unit, a sensor, a control unit and a switch unit, wherein the three-phase drive bridge circuit unit, the sampling trigger unit, the sensor, the control unit and the switch unit are respectively soldered on the upper surface of the first circuit board. This novel three-phase current sampling device has differential current sampling unit and passes through external simulator, debugger and oscilloscope, shows three resistance of sampling, adopts three resistance current in real time through the PWM signal, obtains the sampling data of stabilizing the high accuracy, and the filter screen filters radiating air current, and the entering of the external dust of effective separation improves whole radiating dirt-proof effect, under the good circumstances of guaranteeing inside heat dissipation, prevents that the dust from carrying out the advantage damaged to the inner member.

Description

Novel three-phase current sampling device

Technical Field

The utility model relates to a three-phase current sampling technical field specifically is a novel three-phase current sampling device.

Background

The existing three-phase motor running current sampling adopts direct current sampling, namely, the acquired alternating current sample is rectified and filtered to obtain corresponding direct current voltage, the early motor control uses open loop control, the position information or the current information of the motor is not detected, and the defects of low control efficiency, low response speed, poor control precision and the like exist. With the development of power electronic technology and integrated circuits, closed-loop control of motors has become a conventional algorithm in the industry, when offset voltage is used and currents of different phases are collected, reference places of the offset voltage are different, the conventional algorithm always sets the reference voltages of the different phases to be the same value, so that errors exist when three-phase currents are reproduced, the internal heat dissipation performance of the existing three-phase current sampling device is poor, and dust is easily generated while some equipment dissipates heat, so that internal devices are damaged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel three-phase current sampling device, differential current sampling unit has and passes through external simulator, debugger and oscilloscope, show three resistance of sampling, adopt three resistance current in real time through the PWM signal, obtain the sampling data of stabilizing the high accuracy, the filter screen filters radiating air current, the entering of the external dust of effective separation, improve the dustproof effect of whole heat dissipation, under the good condition of guaranteeing inside heat dissipation, prevent that the dust from carrying out the advantage that damages to interior component, the problem among the prior art has been solved.

In order to achieve the above object, the utility model provides a following technical scheme: a novel three-phase current sampling device comprises a shell, wherein an upper cover plate is arranged above the shell, and a sampling assembly is arranged in the shell;

the sampling assembly comprises a first circuit board, a second circuit board, a three-phase drive bridge circuit unit, a sampling trigger unit, a sensor, a control unit and a switch unit, wherein the three-phase drive bridge circuit unit, the sampling trigger unit, the sensor, the control unit and the switch unit are respectively soldered on the upper surface of the first circuit board, a filtering unit, a differential current sampling unit and a resistance unit are soldered on the upper surface of the second circuit board, a soldering serial port debugging unit is arranged on the lower surface of the second circuit board, one end of the filtering unit is electrically connected with the sampling trigger unit, and a heat-dissipation dust-removal device is arranged inside the shell;

the heat dissipation and dust removal device comprises a heat dissipation motor, a heat dissipation fan, a dust guard and heat dissipation holes, wherein the heat dissipation fan is installed on an output shaft of the heat dissipation motor, the heat dissipation holes are formed in two side ends of the shell, and the dust guard is fixed inside the shell behind the heat dissipation holes.

Preferably, one end of each of the three-phase drive bridge circuit unit and the sampling trigger unit is electrically connected with the control unit through a wire, and the switch unit is also electrically connected with the control unit through a wire.

Preferably, the sensor is connected with the control unit on the first circuit board through a connecting lead.

Preferably, the power supply unit is arranged below the first circuit board and is electrically connected with the three-phase drive bridge circuit unit, the sampling trigger unit, the sensor, the control unit and the switch unit through copper wires integrated on the first circuit board.

Preferably, the heat dissipation motor is fixed on the upper cover plate, and four corners of the upper cover plate are fixed on the shell through screws.

Preferably, the dust guard sets up two sets ofly, sets up the filter screen in the dust guard, and the cladding has one deck sealed pad around the periphery of dust guard.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses three-phase current sampling device, power supply unit all with three-phase drive axle circuit unit through the copper line of integration on first circuit board, the sampling trigger unit, a sensor, the control unit and switch unit electric connection, the signal that switch unit assigned to the control unit on, the pin level changes, three-phase drive axle circuit unit work, three-phase drive axle circuit unit input receives PWM actuating signal, the output meets with the motor, the PWM actuating signal is received to the simultaneous sampling trigger unit, a start moment and generate trigger signal to the control unit for detecting every cycle of PWM actuating signal, differential current sampling unit is through external simulator, debugger and oscilloscope, show three resistance of sampling, adopt three resistance current in real time through the PWM signal, obtain the sampling data of stabilizing the high accuracy.

2. The utility model discloses three-phase current sampling device, the dust guard sets up two sets ofly, set up the filter screen in the dust guard, the outer periphery cladding of dust guard has the sealed pad of one deck, dispel the heat through top radiator fan, cooperate with the both sides louvre, inside formation circulation of air at the shell, inside dispels the heat with higher speed, the setting of dust guard, when dispelling the heat with higher speed and forming the circulation of air, sealed pad seals up, the filter screen filters radiating air current, the entering of the external dust of effective separation, improve the dirt-proof effect of whole heat dissipation, under the good condition of guaranteeing inside heat dissipation, prevent that the dust from damaging internal component.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the sampling assembly of the present invention;

fig. 3 is a schematic diagram of a reverse structure of a second circuit board according to the present invention;

FIG. 4 is a sectional view of the inner structure of the housing of the present invention;

fig. 5 is a schematic diagram of the dust-proof plate structure of the present invention.

In the figure: 1. a housing; 11. an upper cover plate; 2. a sampling component; 21. a first circuit board; 211. a power supply unit; 22. a second circuit board; 221. a filtering unit; 222. a differential current sampling unit; 223. a serial port debugging unit; 224. a resistance unit; 23. a three-phase drive bridge circuit unit; 24. a sampling trigger unit; 25. a sensor; 26. a control unit; 27. a switch unit; 3. a heat dissipation and dust removal device; 31. a heat dissipation motor; 32. a heat radiation fan; 33. a dust-proof plate; 331. a gasket; 34. and (4) heat dissipation holes.

Detailed Description

The technical solution in the embodiment of the present invention will be made clear below with reference to the drawings in the embodiment of the present invention; the present invention has been described in considerable detail with reference to certain preferred versions thereof. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, a novel three-phase current sampling device includes a housing 1, an upper cover plate 11 is disposed above the housing 1, a sampling assembly 2 is disposed inside the housing 1, the sampling assembly 2 includes a first circuit board 21, a second circuit board 22, a three-phase driving bridge circuit unit 23, a sampling trigger unit 24, a sensor 25, a control unit 26 and a switch unit 27, the three-phase driving bridge circuit unit 23, the sampling trigger unit 24, the sensor 25, the control unit 26 and the switch unit 27 are soldered on an upper surface of the first circuit board 21, the three-phase driving bridge circuit unit 23, the sampling trigger unit 24, the sensor 25, the control unit 26 and the switch unit 27 are soldered on an upper surface of the second circuit board 22, a filter unit 221, a differential current sampling unit 222 and a resistor unit 224 are soldered on a lower surface of the second circuit board 22, one end of the filter unit 221 is electrically connected with the sampling trigger unit 24, preferably, one ends of the three-phase driving bridge circuit unit 23 and the sampling trigger unit 24 are, the switch unit 27 is also electrically connected with the control unit 26 through a wire, the sensor 25 is connected with the control unit 26 on the first circuit board 21 through a connected wire, a power supply unit 211 is arranged below the first circuit board 21, the power supply unit 211 is electrically connected with the three-phase drive bridge circuit unit 23, the sampling trigger unit 24, the sensor 25, the control unit 26 and the switch unit 27 through copper wires integrated on the first circuit board 21, signals sent by the switch unit 27 are sent to the control unit 26, the pin level is changed, the three-phase drive bridge circuit unit 23 works, the input end of the three-phase drive bridge circuit unit 23 receives PWM driving signals, the output end of the three-phase drive bridge circuit unit 23 is connected with the motor, the sampling trigger unit 24 receives the PWM driving signals, the sampling trigger unit is used for detecting the starting moment of each period of the PWM driving signals and generating trigger signals to the control unit 26, and the differential current, The debugger and the oscilloscope are used for displaying the three sampled resistors and adopting the three resistor currents in real time through the PWM signals to obtain stable and high-precision sampled data.

Referring to fig. 4-5, a heat dissipation and dust removal device 3 is disposed inside a housing 1, the heat dissipation and dust removal device 3 includes a heat dissipation motor 31, a heat dissipation fan 32, two sets of dust-proof plates 33 and heat dissipation holes 34, the heat dissipation fan 32 is mounted on an output shaft of the heat dissipation motor 31, the heat dissipation holes 34 are disposed at two side ends of the housing 1, the dust-proof plate 33 is fixed inside the housing 1 behind the heat dissipation holes 34, the heat dissipation motor 31 is fixed on an upper cover plate 11, four corners of the upper cover plate 11 are fixed on the housing 1 by screws, two sets of dust-proof plates 33 are disposed, a filter screen is disposed in each dust-proof plate 33, a sealing gasket 331 is wrapped around the outer periphery of each dust-proof plate 33, heat dissipation is performed by the heat dissipation fan 32 above and is matched with the heat dissipation holes 34 at two sides, air circulation is formed inside the housing, the filter screen filters radiating air current, and the entering of external dust of effective separation improves the dustproof effect of whole heat dissipation, under the good circumstances of inside heat dissipation of assurance, prevents that the dust from damaging interior component.

In summary, the following steps: the utility model discloses three-phase current sampling device, power supply unit 211 all with three-phase drive bridge circuit unit 23 through the copper line integrated on first circuit board 21, sampling trigger unit 24, sensor 25, control unit 26 and switch unit 27 electric connection, the signal that switch unit 27 issues changes to control unit 26, the pin level, three-phase drive bridge circuit unit 23 works, three-phase drive bridge circuit unit 23 input receives PWM driving signal, the output is connected with the motor, sampling trigger unit 24 receives PWM driving signal simultaneously, be used for detecting the beginning moment of every cycle of PWM driving signal and generate trigger signal to control unit 26, differential current sampling unit 222 shows sampling three resistance through external simulator, debugger and oscilloscope, adopt three resistance current in real time through PWM signal, obtain the sampling data of stable high accuracy, dust guard 33 sets up two sets ofly, set up the filter screen in the dust guard 33, the outer periphery cladding of dust guard 33 has the sealed pad 331 of one deck, dispel the heat through top radiator fan 32, cooperate with both sides louvre 34, inside formation circulation of air at shell 1, inside dispels the heat with higher speed, the setting of dust guard 33, when dispelling the formation circulation of air with higher speed, sealed pad 331 seals up, the filter screen filters radiating air current, the entering of the external dust of effective separation, improve the dirt-proof effect of whole heat dissipation, under the good condition of guaranteeing inside heat dissipation, prevent that the dust from damaging internal component.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "includes"; "comprises," "comprising," or any other variation thereof, is intended to cover a non-exclusive inclusion, such that a process that comprises a list of elements; a method; an article or apparatus may comprise not only those elements but also other elements not expressly listed or embodied as such; a method; an article or an apparatus.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention; modifying; alternatives and modifications, the scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a novel three-phase current sampling device, includes shell (1), its characterized in that: an upper cover plate (11) is arranged above the shell (1), and a sampling assembly (2) is arranged in the shell (1);

the sampling assembly (2) comprises a first circuit board (21), a second circuit board (22), a three-phase drive bridge circuit unit (23), a sampling trigger unit (24), a sensor (25), a control unit (26) and a switch unit (27), the upper surface of the first circuit board (21) is respectively soldered with a three-phase drive bridge circuit unit (23), a sampling trigger unit (24), a sensor (25), a control unit (26) and a switch unit (27), the upper surface of the second circuit board (22) is soldered with a filter unit (221), a differential current sampling unit (222) and a resistance unit (224), the lower surface of the second circuit board (22) is soldered with a serial port debugging unit (223), one end of the filter unit (221) is electrically connected with the sampling trigger unit (24), and a heat dissipation and dust removal device (3) is arranged in the shell (1);

the heat dissipation and dust removal device (3) comprises a heat dissipation motor (31), a heat dissipation fan (32), a dust guard (33) and heat dissipation holes (34), wherein the heat dissipation fan (32) is installed on an output shaft of the heat dissipation motor (31), the heat dissipation holes (34) are formed in two side ends of the shell (1), and the dust guard (33) is fixed inside the shell (1) behind the heat dissipation holes (34).

2. The novel three-phase current sampling device of claim 1, wherein: one end of each of the three-phase drive bridge circuit unit (23) and the sampling trigger unit (24) is electrically connected with the control unit (26) through a lead, and the switch unit (27) is also electrically connected with the control unit (26) through a lead.

3. The novel three-phase current sampling device of claim 1, wherein: the sensor (25) is connected with a control unit (26) on the first circuit board (21) through a connected lead.

4. The novel three-phase current sampling device of claim 1, wherein: the power supply unit (211) is arranged below the first circuit board (21), and the power supply unit (211) is electrically connected with the three-phase drive bridge circuit unit (23), the sampling trigger unit (24), the sensor (25), the control unit (26) and the switch unit (27) through copper wires integrated on the first circuit board (21).

5. The novel three-phase current sampling device of claim 1, wherein: the heat dissipation motor (31) is fixed on the upper cover plate (11), and four corners of the upper cover plate (11) are fixed on the shell (1) through screws.

6. The novel three-phase current sampling device of claim 1, wherein: the dust guard (33) sets up two sets ofly, sets up the filter screen in dust guard (33), and the cladding has one deck sealed pad (331) around the periphery of dust guard (33).

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