Motor driving and control isolation circuit, driving motor and photovoltaic sweeper

Abstract

The utility model discloses a motor drive and control isolation circuit, a drive motor and a photovoltaic sweeper. The circuit comprises an MCU, a first end of the MCU receives a first driving control signal, and after the MCU performs optical coupling isolation on the first driving control signal, a second end of the MCU outputs a second driving control signal subjected to optical coupling isolation; the receiving end of the isolation chip is connected with the second end of the MCU, the isolation chip is used for receiving a second driving control signal sent by the second end of the MCU, and the transmitting end of the isolation chip sends an isolated third driving control signal; the first end of the driving chip is connected with the transmitting end of the isolation chip, the driving chip is used for receiving a third driving control signal transmitted by the transmitting end of the isolation chip, and after the driving chip performs differential amplification on the third driving control signal, the driving chip performs corresponding driving control based on the signal after differential amplification. According to the utility model, the control circuit can be protected when the driving circuit fails.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit control, and in particular to a motor drive and control isolation circuit, a drive motor, and a photovoltaic sweeper. Background Art

[0002] Since photovoltaic energy storage power generation stations are usually set up in open areas or remote locations, when the power generation drive equipment or cleaning drive equipment is working during photovoltaic operations, once a drive component failure occurs in the equipment and the control component is damaged, personnel cannot be deployed for maintenance in the first time, causing safety hazards to the power generation drive equipment or cleaning drive equipment in the photovoltaic energy storage power generation station, and affecting the operation, maintenance, cleaning and installation efficiency of the photovoltaic energy storage power generation station during the failure process.

[0003] Therefore, there is a need for a motor drive and control isolation circuit to achieve the effect of protecting the control circuit when the drive circuit fails. Utility Model Content

[0004] In order to solve the technical problem that the control components are damaged when the drive components of the power generation drive equipment or the cleaning drive equipment in the existing photovoltaic operation fail, the utility model provides a motor drive and control isolation circuit, a drive motor, and a photovoltaic sweeper. The specific technical solutions are as follows:

[0005] The utility model provides a motor drive and control isolation circuit, comprising:

[0006] MCU, wherein a first end of the MCU receives a first drive control signal, the MCU performs optical coupling isolation on the drive control signal, and then outputs a second drive control signal after optical coupling isolation at a second end of the MCU;

[0007] an isolation chip, wherein a receiving end of the isolation chip is connected to the second end of the MCU and is used to receive the second drive control signal sent by the second end of the MCU, and a transmitting end of the isolation chip sends an isolated third drive control signal;

[0008] A driving chip, wherein a first end of the driving chip is connected to a transmitting end of the isolation chip, and is used to receive the third driving control signal sent by the transmitting end of the isolation chip. After the driving chip performs differential amplification on the isolated third driving control signal, the driving chip performs corresponding driving control based on the differentially amplified signal.

[0009] The motor drive and control isolation circuit provided by the utility model isolates the control part and the drive part by setting an isolation chip, thereby achieving the purpose of protecting the control circuit when the drive circuit fails, and reducing the safety hazards of power generation drive equipment or cleaning drive equipment in photovoltaic energy storage power stations.

[0010] In some implementations, the MCU specifically includes:

[0011] A Hall signal input terminal, wherein the first terminal of the MCU includes at least one Hall signal input terminal, which is used to receive an externally input Hall control signal, and the first drive control signal includes the Hall control signal;

[0012] An optocoupler isolation unit, wherein a receiving end of the optocoupler isolation unit is connected to each of the Hall signal input ends, and a transmitting end of the optocoupler isolation unit outputs the Hall control signal after optocoupler isolation;

[0013] Control signal output terminal, at least one of the control signal output terminals is connected to the transmitting terminal of the optocoupler isolation unit, the number of the control signal output terminals is the same as the number of the Hall signal input terminals, and is used to receive the Hall control signal output by the transmitting terminal of the optocoupler isolation unit and output the Hall control signal to the outside.

[0014] The motor drive and control isolation circuit provided by the utility model receives the Hall signal in the MCU and sets an optocoupler isolation unit, so that the MCU performs speed loop control and optocoupler isolation according to the Hall signal, and the isolation chip is used to prevent the drive chip from being damaged and affecting the speed loop control.

[0015] In some implementations, the MCU further includes:

[0016] A speed signal input terminal, the first terminal of the MCU includes at least one speed signal input terminal, which is used to receive a speed control signal input from the outside, and the first drive control signal includes the speed control signal;

[0017] The receiving end of the optical coupling isolation unit is connected to each of the speed signal input ends, and the sending end of the optical coupling isolation unit outputs the speed control signal after optical coupling isolation;

[0018] The number of the control signal output terminals is the same as the total number of the Hall signal input terminals and the speed signal input terminals, and is used to receive the Hall control signal and the speed control signal output by the transmitting end of the optocoupler isolation unit, and output the Hall control signal and the speed control signal to the outside.

[0019] In some implementations, the MCU further includes:

[0020] At least one filtering unit, each of the filtering units is connected to each of the control signal output terminals, and is used to filter the output signal of the control signal output terminal;

[0021] The filtering unit includes a filtering capacitor and a filtering resistor;

[0022] The first end of the filter capacitor and the first end of the filter resistor are both connected to the control signal output end;

[0023] The second end of the filter capacitor and the second end of the filter resistor are both grounded.

[0024] In some implementations, the driver chip specifically includes:

[0025] A driving control unit, connected to the transmitting end of the isolation chip, and configured to receive the isolated third driving control signal;

[0026] a current sampling unit, connected to the drive control unit, and configured to perform current sampling according to the third drive control signal and output a sampling result value;

[0027] A differential amplifier unit connected to the current sampling unit, configured to perform differential operational amplifier isolation amplification on the sampling result value and then output it to the drive control unit;

[0028] The driving control unit performs current loop control according to the signal amplified by the differential operational amplifier isolation, and outputs a current loop control result value.

[0029] The motor drive and control isolation circuit provided by the utility model realizes the current loop control effect in the driver chip by setting a drive control unit, a current sampling unit and a differential amplifier unit, and avoids MCU failure when the driver chip is damaged based on the isolation chip.

[0030] In some implementations, the optical coupling isolation unit specifically includes:

[0031] The photoelectric emitting end is connected to each of the Hall signal input ends, and is used to drive the light emitting diode according to the input Hall control signal to output a corresponding light signal;

[0032] The photoelectric receiving end is used to receive the optical signal output by the photoelectric transmitting end, and generate and output the Hall control signal after optical coupling isolation according to the optical signal.

[0033] In some embodiments, the photoelectric emission end includes a photoresistor and a phototransistor.

[0034] In some embodiments, the utility model further provides a drive motor, comprising the above-mentioned motor drive control isolation circuit.

[0035] In some embodiments, the utility model also provides a photovoltaic sweeper, comprising the above-mentioned drive motor.

[0036] The utility model provides a motor drive and control isolation circuit, which includes at least one of the following technical effects:

[0037] (1) By setting up an isolation chip, the control part and the drive part of the motor are isolated from each other, so as to protect the control circuit when the drive circuit fails, and reduce the potential safety hazard of synchronous damage to the control current caused by damage to the drive equipment or the cleaning drive equipment in the photovoltaic power station;

[0038] (2) By receiving the Hall signal in the MCU and setting up an optocoupler isolation unit, the speed loop control and optocoupler isolation are performed inside the MCU according to the Hall signal. The isolation chip is used to prevent the driver chip from being damaged and affecting the speed loop control and then the MCU;

[0039] (3) By setting up a drive control unit, a current sampling unit and a differential amplifier unit, the current loop control effect in the drive chip is realized, and the MCU failure when the drive chip is damaged is avoided based on the isolation chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 This is an example diagram of a motor drive and control isolation circuit of the utility model;

[0042] Figure 2 This is an example diagram of an MCU in a motor drive and control isolation circuit of the utility model;

[0043] Figure 3 This is an example diagram of an isolation chip in a motor drive and control isolation circuit of the utility model.

[0044] The reference numerals in the figure are: MCU-10, isolation chip-20, driver chip-30 and optocoupler isolation unit-40. DETAILED DESCRIPTION

[0045] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0046] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0047] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0048] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0050] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0051] An embodiment of the utility model, as Figure 1 As shown, the utility model provides a motor drive and control isolation circuit, including an MCU 10 , an isolation chip 20 and a drive chip 30 .

[0052] The first end of the MCU10 receives the first driving control signal, and after the MCU10 performs optical coupling isolation on the first driving control signal, the second end of the MCU10 outputs the second driving control signal after the optical coupling isolation.

[0053] The receiving end of the isolation chip 20 is connected to the second end of the MCU 10 and is used to receive the second driving control signal sent by the second end of the MCU 20 . The transmitting end of the isolation chip 20 sends the isolated third driving control signal.

[0054] The first end of the driving chip 30 is connected to the transmitting end of the isolation chip 20, and is used to receive the isolated third driving control signal sent by the transmitting end of the isolation chip 20. After the driving chip 30 performs differential amplification on the third driving control signal, the driving chip 30 performs corresponding driving control based on the differentially amplified signal.

[0055] Specifically, the driving chip 30 drives the motor to perform corresponding motor operations based on the signal after differential amplification. The motor current signal output by the motor is output to the operational amplifier input device. The operational amplifier output value output by the operational amplifier input device passes through the comparator and inputs the first driving signal to MCU10. The operational amplifier input device synchronously outputs the ADC sampling value to MCU10.

[0056] The motor drive and control isolation circuit provided by the utility model isolates the control part and the drive part of the motor by setting an isolation chip, thereby achieving the purpose of protecting the control circuit when the drive circuit fails, and reducing the safety hazard when the power generation drive equipment or the cleaning drive equipment in the photovoltaic power station is damaged.

[0057] In one embodiment, Figure 2 As shown, the utility model provides a motor drive and control isolation circuit, wherein the MCU 10 specifically includes a Hall signal input terminal, an optical coupling isolation unit 40 and a control signal output terminal.

[0058] Among them, the output signal of the motor is input to the isolation chip 20 through the Hall sensor, the Hall signal input end is used to receive the Hall control signal input by the isolation chip 20, the receiving end of the optocoupler isolation unit 40 is connected to each Hall signal input end, the transmitting end of the optocoupler isolation unit 40 outputs the Hall control signal after optocoupler isolation, at least one control signal output end is connected to the transmitting end of the optocoupler isolation unit, the number of control signal output ends is the same as the number of Hall signal input ends, and is used to receive the Hall control signal output by the transmitting end of the optocoupler isolation unit 40, and output the Hall control signal after isolation by the optocoupler isolation unit to the outside.

[0059] Specifically, the first terminal of the MCU includes at least one Hall signal input terminal, and the first drive control signal includes a Hall control signal, for example Figure 2 As shown in FIG, the Hall signals HALL1, HALL2 and HALL3 are input to the Hall signal input terminal, and after being optically coupled by the optical coupling isolation unit 40, the HALL SN1 IN, HALL SN1 IN2 and HALL SN1 IN3 signals are output at the control signal output terminal.

[0060] The motor drive and control isolation circuit provided in this embodiment receives the Hall signal in the MCU and sets an optocoupler isolation unit, so that the MCU performs speed loop control and optocoupler isolation according to the Hall signal. The isolation chip prevents damage to the driver chip from affecting the speed loop control and protects the MCU from being affected.

[0061] In one embodiment, Figure 2 As shown, the first end of the MCU also includes at least one speed signal input terminal, which is used to receive the speed control signal of the motor input from the outside. The first drive control signal includes the speed control signal. The receiving end of the optocoupler isolation unit 40 is connected to each speed signal input terminal, and the transmitting end of the optocoupler isolation unit 40 outputs the speed control signal after optocoupler isolation. The number of control signal output terminals is the same as the total number of Hall signal input terminals and speed signal input terminals, which are used to receive the Hall control signal and the speed control signal output by the transmitting end of the optocoupler isolation unit, and output the isolated Hall control signal and the speed control signal to the outside. The isolated Hall control signal and the speed control signal are input to the MCU to form a speed loop control effect.

[0062] For example, Figure 2 As shown, the first end of the MCU also includes a speed signal input terminal, which receives an external speed control signal SPEED. After the speed control signal SPEED passes through the optocoupler isolation unit 40, it outputs SPEED PS at the corresponding control signal output terminal. There are 3 Hall signal input terminals, 1 speed signal input terminal, and 4 control signal output terminals in this structure.

[0063] Furthermore, MCU10 specifically also includes at least one filtering unit, each filtering unit is respectively connected to each control signal output terminal, and is used to filter the output signal of the control signal output terminal. The filtering unit includes a filtering capacitor and a filtering resistor, and the first end of the filtering capacitor and the first end of the filtering resistor are both connected to the control signal output terminal, and the second end of the filtering capacitor and the second end of the filtering resistor are both grounded.

[0064] Furthermore, the optocoupler isolation unit 40 specifically includes: a photoelectric transmitting end and a photoelectric receiving end. The photoelectric transmitting end is connected to each Hall signal input end, and is used to drive the light-emitting diode according to the input Hall control signal and output the corresponding light signal. The photoelectric receiving end is used to receive the light signal output by the photoelectric transmitting end, and generate and output the Hall control signal after optocoupler isolation according to the light signal. The photoelectric transmitting end includes a photoresistor and a phototransistor.

[0065] In one embodiment, the driving chip 30 specifically includes a driving control unit, a current sampling unit and a differential amplification unit.

[0066] Among them, the drive control unit is connected to the transmitting end of the isolation chip 20, and is used to receive the third drive control signal after isolation. The current sampling unit is connected to the drive control unit, and is used to perform current sampling according to the third drive control signal and output the sampling result value. The differential amplifier unit is connected to the current sampling unit, and is used to perform differential operational amplifier isolation and amplification on the sampling result value, and then output it to the drive control unit. After the differential operational amplifier isolation and amplification, the drive control unit supplies the signal to the MCU to form a current loop control effect.

[0067] The motor drive and control isolation circuit provided by the utility model provides a drive control unit, a current sampling unit and a differential amplifier unit, and supplies the signal processed by the differential amplifier unit to the MCU to form a current loop control effect, and avoids the situation where the MCU fails when the drive chip is damaged based on the isolation chip.

[0068] In one embodiment, Figure 3 The figure shows an example diagram of the isolation chip 20. The input terminals VI1 and VI2 of the isolation chip 20 receive the motor control signals MH1 and ML1 respectively. The optocoupler isolation unit outputs the signal to the control signal output terminal in the MCU10. The control signal output terminal in the MCU10 outputs the signal to the MH1 port of the isolation chip. The output terminals VO1 and VO2 of the isolation chip 20 output the isolated drive control signals H1 and L1 respectively.

[0069] In one embodiment, according to another aspect of the utility model, the utility model further provides a drive motor, comprising the motor drive and control isolation circuit provided in the above embodiment.

[0070] In one embodiment, according to another aspect of the present invention, the present invention further provides a photovoltaic sweeper, comprising the drive motor provided in the above embodiment.

[0071] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0072] Those of ordinary skill in the art will appreciate that the units and steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed with hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0073] In the embodiments provided in the present application, it should be understood that the disclosed motor drive control isolation circuit can be implemented in other ways. For example, the motor drive control isolation circuit embodiment described above is only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or modules can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the communication connection between each other shown or discussed can be through some interfaces, communication connections of devices or units or integrated circuits, which can be electrical, mechanical or other forms.

[0074] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0075] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0076] It should be noted that the above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A motor drive and control isolation circuit, characterized in that: include: MCU, wherein a first end of the MCU receives a first drive control signal, and after the MCU performs optical coupling isolation on the first drive control signal, the MCU outputs a second drive control signal after optical coupling isolation at a second end of the MCU; an isolation chip, wherein a receiving end of the isolation chip is connected to the second end of the MCU and is used to receive the second drive control signal sent by the second end of the MCU, and a transmitting end of the isolation chip sends an isolated third drive control signal; A driving chip, wherein a first end of the driving chip is connected to a transmitting end of the isolation chip, and is used to receive the third driving control signal sent by the transmitting end of the isolation chip. After the driving chip performs differential amplification on the isolated third driving control signal, the driving chip performs corresponding driving control based on the differentially amplified signal.

2. A motor drive and control isolation circuit according to claim 1, characterized in that: The MCU specifically includes: A Hall signal input terminal, wherein the first terminal of the MCU includes at least one Hall signal input terminal, which is used to receive an externally input Hall control signal, and the first drive control signal includes the Hall control signal; An optocoupler isolation unit, wherein a receiving end of the optocoupler isolation unit is connected to each of the Hall signal input ends, and a transmitting end of the optocoupler isolation unit outputs the Hall control signal after optocoupler isolation; Control signal output terminal, at least one of the control signal output terminals is connected to the transmitting terminal of the optocoupler isolation unit, the number of the control signal output terminals is the same as the number of the Hall signal input terminals, and is used to receive the Hall control signal output by the transmitting terminal of the optocoupler isolation unit and output the Hall control signal to the outside.

3. A motor drive and control isolation circuit according to claim 2, characterized in that: The MCU specifically includes: A speed signal input terminal, the first terminal of the MCU includes at least one speed signal input terminal, which is used to receive a speed control signal input from the outside, and the first drive control signal also includes the speed control signal; The receiving end of the optical coupling isolation unit is connected to each of the speed signal input ends, and the sending end of the optical coupling isolation unit outputs the speed control signal after optical coupling isolation; The number of the control signal output terminals is the same as the total number of the Hall signal input terminals and the speed signal input terminals, and is used to receive the Hall control signal and the speed control signal output by the transmitting end of the optocoupler isolation unit, and output the Hall control signal and the speed control signal after the optocoupler isolation to the outside.

4. A motor drive and control isolation circuit according to any one of claims 2 or 3, characterized in that: The MCU specifically includes: At least one filtering unit, each of the filtering units is connected to each of the control signal output terminals, and is used to filter the output signal of the control signal output terminal; The filtering unit includes a filtering capacitor and a filtering resistor; The first end of the filter capacitor and the first end of the filter resistor are both connected to the control signal output end; The second end of the filter capacitor and the second end of the filter resistor are both grounded.

5. The motor drive and control isolation circuit according to claim 1, characterized in that: The driver chip specifically comprises: A driving control unit, connected to the transmitting end of the isolation chip, and configured to receive the isolated third driving control signal; a current sampling unit, connected to the drive control unit, and configured to perform current sampling according to the third drive control signal and output a sampling result value; A differential amplifier unit connected to the current sampling unit, configured to perform differential operational amplifier isolation amplification on the sampling result value and then output it to the drive control unit; The driving control unit forms a current loop control after isolating and amplifying the differential operational amplifier, and outputs a current loop control result value.

6. A motor drive and control isolation circuit according to claim 2, characterized in that: The optical coupling isolation unit specifically includes: A photoelectric emitting end connected to each of the Hall signal input ends, and used to drive the light emitting diode according to the input Hall control signal to output a corresponding light signal; The photoelectric receiving end is used to receive the optical signal output by the photoelectric transmitting end, and generate and output the Hall control signal after optical coupling isolation according to the optical signal.

7. A motor drive and control isolation circuit according to claim 6, characterized in that: The photoelectric emission end includes a photoresistor and a phototransistor.

8. A driving motor, characterized in that: The invention comprises the motor drive and control isolation circuit as described in any one of claims 1 to 7.

9. A photovoltaic cleaning machine, characterized in that: It includes the driving motor as described in claim 8 above.

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