CN113014178A

CN113014178A - Integrated chip circuit for driving intelligent speed regulation of alternating current motor

Info

Publication number: CN113014178A
Application number: CN202110311542.0A
Authority: CN
Inventors: 林政宽
Original assignee: Shenzhen Tengyun Chip Technology Co ltd
Current assignee: Shenzhen Tengyun Chip Technology Co ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-06-22

Abstract

The invention discloses an integrated chip circuit for driving an AC motor for intelligent speed regulation, which is composed of a diode D1, a diode D2, a MOS transistor Q1, a MOS transistor Q2, a motor M1, a diode D3, a diode D4 and a MOS transistor Q4. The cathode of the diode D1 is connected to the motor M1, the drain of the MOS transistor Q1 and the alternating current L, the anode of the diode D1 is connected to the anode of the diode D2, the source of the MOS transistor Q1, the source of the MOS transistor Q2 and the ground terminal AGND, the The gate is connected to the gate of the MOS transistor Q2 and the controller Driver1. The AC positive and negative half-wave cycle of the circuit of the present invention is a continuous modulation circuit structure, there is no breakpoint surge problem when the positive and negative half-wave switching is performed, and no zero point is required like the H-bridge circuit structure Detection and commutation modulation, effectively solve the problem of commutation surge and noise. The back-EMF effect of the coil inductance in the motor is also absorbed by the Q1, Q2, and instantaneous short-circuit circuit to improve the heating problem of the MOSFET tubes Q3 and Q4.

Description

Integrated chip circuit for driving intelligent speed regulation of alternating current motor

Technical Field

The invention relates to the technical field of motor control, in particular to an integrated chip circuit for driving an alternating current motor to intelligently regulate speed.

Background

In the frequency conversion driving device, frequency modulation is used as the main design concept, and the control theory is that alternating current is converted into direct current, and then direct current is converted into alternating current with changeable frequency, so as to control the load motor, so that the circuit area of the conventional frequency conversion driving device is larger and the required manufacturing cost is higher. Therefore, there is still room for improvement in variable frequency drives.

For example, the ac motor speed adjusting circuit with patent number CN202231665U includes an ac motor, a thyristor, a sampling resistor, an overload protection module, a motor speed adjustment module, a control chip and a dc power supply, and the whole technical scheme is to adjust the conduction angle of the thyristor by using the control chip, so as to further realize the control of the ac motor, and the break-point surge problem during the switching of positive and negative half-waves is easily generated by this way.

For example, the speed regulating circuit of the ac motor of patent No. CN208890692U uses a triac and a single-pole double-throw switch to switch the circuit, so as to adjust the click, which is simple, but has a serious problem of phase change and noise.

For the above reasons, it is desirable to provide an ac motor speed regulation circuit capable of solving the problem of breakpoint surge and the problem of commutation surge and noise during switching of positive and negative half waves.

Disclosure of Invention

The present invention is directed to an integrated chip circuit for driving an ac motor to intelligently regulate speed, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

an integrated chip circuit for driving an alternating current motor to intelligently regulate speed is composed of a diode D1, a diode D2, a MOS tube Q1, a MOS tube Q2, a motor M1, a diode D3, a diode D4 and a MOS tube Q4, the cathode of the diode D1 is connected with the drain of the motor M1 and the MOS transistor Q1 and the alternating current L, the anode of the diode D1 is connected with the anode of the diode D2, the source of the MOS transistor Q1, the source of the MOS transistor Q2 and the ground terminal AGND, the gate of the MOS transistor Q1 is connected with the gate of the MOS transistor Q2 and the controller Driver1, the cathode of the diode D2 is connected with the other end of the motor M1, the drain of the MOS transistor Q2, the drain of the MOS transistor Q3 and the cathode of the diode D4, the source of the MOS transistor Q3 is connected with the anode of the diode D3, the anode of the diode D4, the source of the MOS transistor Q4 and the ground terminal BGND, the gate of the MOS transistor Q3 is connected with the gate of the MOS transistor Q3 and the controller Driver2, and the cathode of the diode D4 is connected with the other end of.

As a further technical scheme of the invention: and the MOS tube Q1 and the MOS tube Q2 are linked.

As a further technical scheme of the invention: and the MOS tube Q3 and the MOS tube Q4 are linked.

As a further technical scheme of the invention: the MOS transistor Q1 and the MOS transistor Q2 are both P-MOS transistors.

As a further technical scheme of the invention: the MOS transistor Q3 and the MOS transistor Q4 are both P-MOS transistors.

As a further technical scheme of the invention: the controller Driver1 is a PWM controller.

As a further technical scheme of the invention: the controller Driver2 is a PWM controller.

Compared with the prior art, the invention has the beneficial effects that: the alternating-current positive and negative half-wave cycle of the circuit is a continuous modulation circuit framework, the problem of breakpoint surge during switching of the positive half-wave and the negative half-wave is solved, zero point detection and commutation modulation of an H-bridge circuit framework are not needed, and the problems of commutation surge and noise are effectively solved. The counter electromotive force effect of the coil inductor in the motor is also absorbed through Q1 and Q2 and an instantaneous short circuit, so that the heating problem of the MOSFET transistors Q3 and Q4 is solved.

Drawings

FIG. 1 is a prior art circuit diagram;

FIG. 2 is a circuit diagram of the present invention;

fig. 3 is an operation schematic diagram.

Fig. 4 is a diagram of an ac sine wave loaded PWM waveform.

Fig. 5 is a graph of the actual waveform of the M1 motor terminal after the ac sine wave is loaded into the PWM.

Fig. 6 is an electrical schematic of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2-6, example 1: an integrated chip circuit for driving an alternating current motor to intelligently regulate speed is composed of a diode D1, a diode D2, a MOS tube Q1, a MOS tube Q2, a motor M1, a diode D3, a diode D4 and a MOS tube Q4, the cathode of the diode D1 is connected with the drain of the motor M1 and the MOS transistor Q1 and the alternating current L, the anode of the diode D1 is connected with the anode of the diode D2, the source of the MOS transistor Q1, the source of the MOS transistor Q2 and the ground terminal AGND, the gate of the MOS transistor Q1 is connected with the gate of the MOS transistor Q2 and the controller Driver1, the cathode of the diode D2 is connected with the other end of the motor M1, the drain of the MOS transistor Q2, the drain of the MOS transistor Q3 and the cathode of the diode D4, the source of the MOS transistor Q3 is connected with the anode of the diode D3, the anode of the diode D4, the source of the MOS transistor Q4 and the ground terminal BGND, the gate of the MOS transistor Q3 is connected with the gate of the MOS transistor Q3 and the controller Driver2, and the cathode of the diode D4 is connected with the other end of.

MOS transistor Q1 and MOS transistor Q2 are interlocked. MOS transistor Q3 and MOS transistor Q4 are interlocked. MOS pipe Q1 and MOS pipe Q2 are both P-MOS pipes. MOS pipe Q3 and MOS pipe Q4 are both P-MOS pipes. The controller Driver1 is a PWM controller. The controller Driver2 is a PWM controller.

Four MOSFET tubes (Q1, Q2, Q3 and Q4), wherein D1, D2, D3 and D4 are free wheel diodes inside the MOSFETs, two groups of driving circuits and two groups of independent power supplies for driving.

When an alternating voltage is input in terms of alternating positive and negative half-wave cycles (Q1, Q2 OFF); (Q3, Q4 ON; the positive half cycle is conducted by Q3 automatically, the negative half cycle is conducted by Q4), the input alternating voltage forms a closed loop with M1, Q3 and Q4 at the moment, the output waveform of the motor end is the input alternating voltage waveform, and the motor runs at full speed.

When the positive half cycle and the negative half cycle are viewed in the AC positive and negative half-wave cycles (Q3, Q4 OFF), (Q1, Q2 ON; the positive half cycle is automatically conducted by Q1, and the negative half cycle is conducted by Q2), the input AC voltage circuit is disconnected, and the motor stops running. And Q1, Q2 and M1 form a closed loop, and the surge voltage of the coil inductance back electromotive force effect in the motor is instantaneously short-circuited and absorbed by AGND.

When the AC motor is in an AC voltage input state, the switching action is accelerated in a staggered way, namely, a Pulse Width Modulation (PWM) control signal is loaded in an AC voltage waveform to form an AC voltage waveform envelope, and the AC motor can be regulated by adjusting the PWM duty ratio. The actual operation sequence flow is Q1(OFF) Q3(ON) Q1(ON) Q3(OFF) in the positive half cycle of the alternating current, and Q2(OFF) Q4(ON) Q2(ON) Q4(OFF) in the negative half cycle of the alternating current; and repeating the steps and sequentially circulating the steps. Q1, Q3, Q2 and Q4 are complementary waveforms and cannot be turned on simultaneously.

In embodiment 2, based on embodiment 1, as shown in fig. 6, the controller Driver1 and the controller Driver2 are powered by the power supply unit, receive signals through the I/0 unit, then are processed by the arithmetic unit, and finally form control signals by the pulse modulation unit to be sent to the controller Driver1 and the controller Driver2 for controlling the operation of each MOS transistor.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. an integrated chip circuit for driving the intelligent speed regulation of an AC motor, consisting of a diode D1, a diode D2, a MOS tube Q1, a MOS tube Q2, a motor M1, a diode D3, a diode D4 and a MOS tube Q4, and is characterized in that, The cathode of the diode D1 is connected to the motor M1, the drain of the MOS transistor Q1 and the alternating current L, the anode of the diode D1 is connected to the anode of the diode D2, the source of the MOS transistor Q1, the source of the MOS transistor Q2 and the ground terminal AGND, the MOS transistor The gate of Q1 is connected to the gate of the MOS transistor Q2 and the controller Driver1, the cathode of the diode D2 is connected to the other end of the motor M1, the drain of the MOS transistor Q2, the drain of the MOS transistor Q3 and the cathode of the diode D4. The source is connected to the anode of the diode D3, the anode of the diode D4, the source of the MOS transistor Q4 and the ground terminal BGND, the gate of the MOS transistor Q3 is connected to the gate of the MOS transistor Q3 and the controller Driver2, and the cathode of the diode D4 is connected to the MOS transistor Q4 The other end of , and the alternating current N.

2 . The integrated chip circuit for driving the intelligent speed regulation of an AC motor according to claim 1 , wherein the MOS transistor Q1 and the MOS transistor Q2 are linked together. 3 .

3 . The integrated chip circuit for driving the intelligent speed regulation of an AC motor according to claim 2 , wherein the MOS transistor Q3 and the MOS transistor Q4 are linked together. 4 .

4 . The integrated chip circuit for driving the intelligent speed regulation of an AC motor according to claim 2 , wherein the MOS transistor Q1 and the MOS transistor Q2 are both P-MOS transistors. 5 .

5 . The integrated chip circuit for driving the intelligent speed regulation of an AC motor according to claim 2 , wherein the MOS transistor Q3 and the MOS transistor Q4 are both P-MOS transistors. 6 .

6 . The integrated chip circuit for driving the intelligent speed regulation of an AC motor according to claim 2 , wherein the controller Driver1 is a PWM controller. 7 .

7 . The integrated chip circuit for driving the intelligent speed regulation of the AC motor according to claim 2 , wherein the controller Driver2 is a PWM controller. 8 .