CN217010840U

CN217010840U - Speed feedback signal output circuit of single-phase water pumping motor of mobile air conditioner

Info

Publication number: CN217010840U
Application number: CN202220374211.1U
Authority: CN
Inventors: 聂鹏举; 刘辉; 陈伯胜; 秦国中; 朱勇民
Original assignee: Shenzhen Kelier Intelligent Control Technology Co ltd
Current assignee: Shenzhen Kelier Motor Co ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-07-19
Anticipated expiration: 2032-02-23

Abstract

The utility model discloses a speed feedback signal output circuit of a single-phase water pumping motor of a mobile air conditioner, which comprises an EC1 speed feedback signal output circuit, a C1 speed feedback signal output circuit, a U1 speed feedback signal output circuit and an FG speed feedback signal output circuit; the C1 and the U1 are both connected on the EC1 in parallel, and a DO pin and a DOB pin of the U1 are respectively connected to two ends of the motor coil and are supplied with power and input through VCC; and the FG speed signal output circuit is connected with any one end of the motor coil. The utility model reduces the cost of the driving board through the FG speed signal output circuit and improves the reliability and the use flexibility of the driving board.

Description

Speed feedback signal output circuit of single-phase water pumping motor of mobile air conditioner

Technical Field

The utility model relates to a circuit, in particular to a speed feedback signal output circuit of a single-phase water pumping motor of a mobile air conditioner.

Background

The mobile air conditioner can produce condensed water during refrigeration, a water fetching device is matched in the mobile air conditioner, the condensed water is fetched into water mist by the water fetching device, and the water mist is discharged outdoors through the exhaust fan. Most of motors used by the water fetching device currently use alternating-current shaded pole motors, the alternating-current shaded pole motors have large loss and low efficiency, the power supply voltage is mains supply, and the safety is poor. It is currently popular to replace an ac shaded pole motor with a single-phase permanent magnet brushless dc motor. The single-phase permanent magnet brushless direct current motor has the advantages of high efficiency, long service life, high safety, simple control and the like. The single-phase permanent magnet brushless direct current motor needs to be controlled through a driving plate so as to realize the functions of speed regulation, FG signal output and the like. FG is a feedback signal of the rotating speed of the motor, and the running condition of the motor can be known in real time through the FG signal, so that the reliability and the accuracy of FG signal output are very important. The single-phase permanent magnet direct current brushless motor driving chips on the market at present are divided into two types: firstly, the FG output function is integrated in the chip, which causes the defects of overlarge chip volume, inflexible use, high cost and the like; the second is that the driving chip has no FG output function, the chip has small volume and low cost, but has great limitation in application because of no FG function.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a speed feedback signal output circuit of a single-phase water pumping motor of a mobile air conditioner, and aims to solve the problems of overlarge chip volume, inflexible use and high cost in the background technology.

The speed feedback signal output circuit of the single-phase water pumping motor of the mobile air conditioner is realized by the following technical scheme: the device comprises an EC1, a C1, a U1 and an FG speed signal output circuit;

the C1 and the U1 are both connected on the EC1 in parallel, and a DO pin and a DOB pin of the U1 are respectively connected to two ends of the motor coil and are supplied with power and input through VCC; the FG speed signal output circuit is connected with any one end of the motor coil.

Preferably, the FG speed signal output circuit includes R2, C2 and Q1, one end of R2 is connected to any one end of the motor coil, the other end of R2 is connected to the B pole of the switching tube Q1, the capacitor C2 is connected in parallel between the B pole and the E pole of Q1, the E pole of Q1 is grounded, and the C pole of Q1 outputs the FG speed feedback signal.

Preferably, Q1 is a triode or a MOS transistor.

As a preferred technical scheme, a Hall circuit and an H bridge circuit are arranged in the U1, and a DO pin and a DOB pin are output ends of the H bridge in the chip.

The utility model has the beneficial effects that: the utility model reduces the cost of the driving board through the FG speed signal output circuit and improves the reliability and the use flexibility of the driving board.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of the circuit of the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

As shown in fig. 1, the speed feedback signal output circuit of the single-phase water pumping motor of the mobile air conditioner of the utility model comprises an EC1, a C1, a U1 and an FG speed signal output circuit;

the C1 and the U1 are both connected on the EC1 in parallel, and a DO pin and a DOB pin of the U1 are respectively connected to two ends of the motor coil and are supplied with power and input through VCC; and the FG speed signal output circuit is connected with any one end of the motor coil.

In this embodiment, the FG speed signal output circuit includes R2, C2, and Q1, one end of R2 is connected to any end of the motor coil, the other end of R2 is connected to the B pole of the switching tube Q1, the capacitor C2 is connected in parallel between the B pole and the E pole of Q1, the E pole of Q1 is grounded, and the C pole of Q1 outputs the FG speed feedback signal.

In this embodiment, Q1 is a transistor or a MOS transistor.

In this embodiment, the U1 has Hall and H bridge circuits built therein, and the DO pin and the DOB pin are output terminals of the H bridge inside the chip.

In this embodiment, the C terminal of Q1 may be equipped with a pull-up resistor R1, and the other end of R1 is connected to VCC.

The working principle is as follows:

the U1 controls the rotation of the single-phase permanent magnet brushless DC motor through a built-in Hall and H bridge circuit. A DO pin and a DOB pin of the U1 are output of an H bridge in the chip and are respectively connected with two ends of a motor coil; the output of the two pins is a pair of complementary high-low level signals, for example, when the DO pin is at a high level, the DOB pin is at a low level, the rotor of the motor rotates in a magnetic field, after the motor rotates for a certain angle, the polarity of the magnetic field changes, at this time, the DO pin changes into a low level, and the DOB pin changes into a high level, so that the phase change of the motor is realized, and the motor continuously rotates. During rotation, a set of square waves are generated on the DOB pin and the DO pin. The FG signal can be accurately output by externally connecting a group of FG speed signal output circuits and an optional pull-up resistor on a DOB pin (or a DO pin).

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. The utility model provides a single-phase motor speed feedback signal output circuit of fetching water of mobile air conditioner which characterized in that: the device comprises a capacitor EC1, a capacitor C1, a chip U1 and an FG speed signal output circuit;

the capacitor C1 and the chip U1 are both connected in parallel to the capacitor EC1, and a DO pin and a DOB pin of the chip U1 are respectively connected to two ends of a motor coil and are supplied with power and input through VCC; and the FG speed signal output circuit is connected with any one end of the motor coil.

2. The single-phase motor speed feedback signal output circuit of fetching water of mobile air conditioner of claim 1, characterized in that: the FG speed signal output circuit comprises R2, C2 and Q1, wherein one end of R2 is connected with any one end of a motor coil, the other end of R2 is connected with the B pole of a switch tube Q1, a capacitor C2 is connected between the B pole and the E pole of Q1 in parallel, the E pole of Q1 is grounded, and the C pole of Q1 outputs an FG speed feedback signal.

3. The single-phase motor speed feedback signal output circuit of fetching water of mobile air conditioner of claim 2, characterized in that: the Q1 is a triode or an MOS tube.

4. The single-phase motor speed feedback signal output circuit of fetching water of mobile air conditioner of claim 1, characterized in that: and a Hall circuit and an H bridge circuit are arranged in the U1, and a DO pin and a DOB pin are output ends of an H bridge in the chip.