CN210807122U

CN210807122U - Low-voltage direct-current control circuit and motor

Info

Publication number: CN210807122U
Application number: CN201922228455.XU
Authority: CN
Inventors: 蓝振进; 叶铁英; 李忠正; 刘晨瑞; 胡冠华
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-06-19
Anticipated expiration: 2029-12-11

Abstract

The utility model provides a low pressure direct current control circuit and motor, this circuit includes: the bridge rectifier circuit is used for rectifying the input first voltage to obtain a second voltage, wherein the second voltage is a forward direct current voltage; the transformer is connected with the output end of the bridge rectifier circuit and used for reducing the second voltage to generate a third voltage; the voltage detection circuit is connected with the output end of the transformer and is used for detecting whether the first voltage is smaller than or equal to a preset voltage or not based on the third voltage, wherein the preset voltage represents the rated voltage of the low-voltage direct current motor; and the low-voltage direct current motor control circuit is connected with the output end of the bridge rectifier circuit and is used for controlling the low-voltage direct current motor to be electrified if the first voltage is less than or equal to the preset voltage. Through the utility model discloses, solved among the correlation technique low voltage direct current equipment because of connecing wrong improper voltage etc. and leaded to damaging the technical problem of equipment load to make the system more can the reliable operation.

Description

Low-voltage direct-current control circuit and motor

Technical Field

The utility model relates to an electricity field particularly, relates to a low pressure direct current control circuit and motor.

Background

At present, with the development of a low-voltage direct-current technology, a low-voltage direct-current power supply has the advantages of being safer, cleaner, more energy-saving and the like compared with an alternating-current power supply, and more devices adopt low-voltage direct-current power supply. However, the low-voltage direct-current power supply has positive and negative poles, and the risk of burning the equipment may exist when the low-voltage direct-current power supply is reversely connected, so that the reverse connection prevention treatment needs to be carried out by the rectifier bridge; in addition, when a customer is connected to the commercial power by accident, or the input dc voltage is too high, the rectified bridge becomes a high-voltage dc power supply, and a dc low-voltage load (such as a dc motor) may be burned.

In view of the above technical problems in the related art, no effective solution has been proposed at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a low pressure direct current control circuit and motor to solve at least and solve among the correlation technique low pressure direct current equipment because of connecing wrong improper voltage etc. and lead to damaging the technical problem of equipment load.

According to the utility model discloses an embodiment provides a low pressure direct current control circuit, include: the bridge rectifier circuit is used for rectifying the input first voltage to obtain a second voltage, wherein the second voltage is a forward direct current voltage; the transformer is connected with the output end of the bridge rectifier circuit and used for reducing the second voltage to generate a third voltage; the voltage detection circuit is connected with the output end of the transformer and is used for detecting whether the first voltage is smaller than or equal to a preset voltage or not based on the third voltage, wherein the preset voltage represents the rated voltage of the low-voltage direct-current motor; and the low-voltage direct current motor control circuit is connected with the output end of the bridge rectifier circuit and is used for controlling the low-voltage direct current motor to be electrified if the first voltage is less than or equal to a preset voltage.

Optionally, the voltage detection circuit is further connected to a power detection pin of the low-voltage dc motor control circuit, and configured to detect a numerical relationship between an AD sampling value corresponding to the third voltage and a preset sampling value, where the numerical relationship is configured to detect whether the third voltage detects the first voltage is less than or equal to the preset voltage.

Optionally, the voltage detection circuit is configured to: if the AD sampling value corresponding to the third voltage is detected to be larger than the preset sampling value, determining that the third voltage is larger than the preset voltage; or if the AD sampling value corresponding to the third voltage is detected to be smaller than or equal to the preset sampling value, determining that the third voltage is smaller than or equal to the preset voltage.

Optionally, the low-voltage dc motor control circuit further includes: the triode is connected with a power pin of the low-voltage direct current motor control circuit and is used for controlling the power-on and power-off of the low-voltage direct current motor; and the relay is connected with the collector of the triode and used for controlling the switch of the low-voltage direct current motor to be switched on or switched off in a delayed mode.

Optionally, the low-voltage dc motor control circuit is configured to: if the first voltage is less than or equal to the preset voltage, controlling the low-voltage direct current motor to be electrified by conducting a collector of the triode; or if the first voltage is greater than the preset voltage, controlling the low-voltage direct-current motor to be in a disconnected state by controlling the triode to be not conducted.

According to another embodiment of the present invention, there is provided a motor including the control circuit of any one of the above embodiments.

By the utility model, the input first voltage is rectified and reduced in voltage in sequence to obtain a direct current third voltage; detecting whether the first voltage is less than or equal to a rated voltage of a low-voltage direct-current motor based on the third voltage; if the first voltage is less than or equal to the preset voltage, the low-voltage direct-current motor is controlled to be powered on, the problem of equipment damage caused by the fact that mains supply is connected or too high input voltage is avoided through the rectifying module and the detecting module, and the technical problem that equipment loads are damaged due to the fact that improper voltage connection and the like of low-voltage direct-current equipment in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a system schematic diagram of a low-voltage dc control circuit according to an embodiment of the present invention.

In the figure, 10, a rectification module; 20. a direct current motor control module; 30. and a power supply detection module.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Example 1

In order to solve the technical problem, the utility model provides a low pressure direct current control circuit, this control circuit includes: the bridge rectifier circuit is used for rectifying the input first voltage to obtain a second voltage, wherein the second voltage is a forward direct current voltage; the transformer is connected with the output end of the bridge rectifier circuit and used for reducing the second voltage to generate a third voltage; the voltage detection circuit is connected with the output end of the transformer and is used for detecting whether the first voltage is smaller than or equal to a preset voltage or not based on the third voltage, wherein the preset voltage represents the rated voltage of the low-voltage direct current motor; and the low-voltage direct current motor control circuit is connected with the output end of the bridge rectifier circuit and is used for controlling the low-voltage direct current motor to be electrified if the first voltage is less than or equal to the preset voltage.

In an embodiment of the present disclosure, fig. 1 is a system schematic diagram of a low voltage dc control circuit provided according to an embodiment of the present disclosure, as shown in fig. 1, the system schematic diagram mainly includes: the rectifier module 10 (i.e. the rectifier circuit) prevents the reverse connection of the power supply from possibly damaging the load of the unit; the dc motor control module 20 (i.e., the low-voltage dc motor control circuit) controls the power supply of the dc motor; the power detection module 30 (i.e., the voltage detection circuit) detects the rectified voltage (i.e., the second voltage).

When a client powers on the unit, the rectifier module 10 can output a stable direct current forward voltage, so that the energy storage capacitor C1 and the direct current motor M1 are prevented from being damaged due to the fact that the positive voltage and the negative voltage are reversed. Optionally, after the power supply (i.e., the first voltage) passes through the rectifier module 10, a stable dc voltage value (i.e., the third voltage) is output through the transformer L1, and the power supply detection circuit 30 is configured to detect a magnitude of the voltage value, and control the dc motor control module 20 to energize the dc motor by determining, so as to protect the motor.

Optionally, the voltage detection circuit is further connected to a power detection pin of the low-voltage dc motor control circuit, and is configured to detect a numerical relationship between an AD sampling value corresponding to the third voltage and a preset sampling value, where the numerical relationship is used to detect whether the third voltage detects that the first voltage is less than or equal to the preset voltage.

As shown in fig. 1, the power detection circuit and the power detection pin V _ CHECK of the low-voltage dc motor control circuit are connected, and whether the input voltage is abnormal is determined by the detection cost AD sampling value.

For example, the rectified voltage U1 (i.e., the second voltage) is output as a stabilized voltage U2 (i.e., the third voltage) through a transformer L1, the MCU (fully called Microcontroller Unit) detects the voltage value U2 through the voltage detection module 30 to obtain an AD sample value N, and if the sample value N is smaller than a maximum predetermined value N1 (i.e., the maximum sample value of the MCU), it is determined that the input voltage is normal, and the motor start condition is satisfied, and the MCU controls the dc motor control module 20 to normally energize the dc motor M1.

If the voltage value U2 is too high, it is determined that the power is supplied by the customer in error, and the motor switch in the dc motor control module is turned off by controlling the dc motor control module 20, and a fault code is sent to prompt the user that the power supply is abnormal.

Optionally, the low-voltage dc motor control circuit further includes: the triode is connected with a power pin of a control unit MCU of the low-voltage direct current motor control circuit and is used for controlling the power-on and power-off of the low-voltage direct current motor; and the relay is connected with the collector of the triode and used for controlling the switch of the low-voltage direct current motor to be switched on or switched off in a delayed mode.

Optionally, the low voltage dc motor control circuit is configured to: if the first voltage is less than or equal to the preset voltage, controlling the low-voltage direct current motor to be electrified by conducting a collector of the triode; or if the first voltage is greater than the preset voltage, the low-voltage direct current motor is controlled to be in a disconnected state by controlling the triode to be not conducted.

As shown in fig. 1, by providing a transistor and a relay in the dc motor control module 20. Optionally, if the input voltage is normal, the MCU controls a START command to supply power to the switching circuit of the low-voltage dc motor, the transistor Q1 is turned on, the relay K1 is supplied power through the collector 3 of the transistor, and the low-voltage dc motor M1 is controlled to be turned on in a delayed manner.

In another alternative example, taking the input ac power as an example, as shown in fig. 1, a certain type of air conditioner is powered by a low-voltage DC power supply, the rated input voltage DC 50V (DC voltage), the rated voltage DC 50V of the DC motor M1, and the maximum input voltage DC 100V. When a customer accidentally connects a wrong AC220V (alternating voltage), the output voltage U1 (namely the second voltage) of the rectifier module 10 is up to 310V, the output voltage U2 (namely the third voltage) of the transformer is 4.5V, the AD sampling value N of the MCU power detection pin V _ CHECK (detection) is 700 and is far greater than the maximum preset value 500 of the MCU, a fault code is sent out immediately to prompt the customer to connect the wrong power supply or the input voltage is too high, meanwhile, the MCU controls the START pin to output low level to make the triode Q1 be not conducted, the relay wire K1 is not electrified, and the positive electrode and the negative electrode of the direct current motor are not conducted, so that the technical problems that the AC voltage is connected to become a high-voltage direct current power supply after being rectified by a rectifier bridge, the load equipment is damaged and the like are solved, and the motor is protected.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and optionally they may be implemented by program code executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that shown or described herein, or separately fabricated as individual integrated circuit modules, or multiple ones of them fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control circuit, comprising:

the bridge rectifier circuit is used for rectifying the input first voltage to obtain a second voltage, wherein the second voltage is a forward direct current voltage;

the transformer is connected with the output end of the bridge rectifier circuit and used for reducing the second voltage to generate a third voltage;

the voltage detection circuit is connected with the output end of the transformer and is used for detecting whether the first voltage is smaller than or equal to a preset voltage or not based on the third voltage, wherein the preset voltage represents the rated voltage of the low-voltage direct-current motor;

and the low-voltage direct current motor control circuit is connected with the output end of the bridge rectifier circuit and is used for controlling the low-voltage direct current motor to be electrified if the first voltage is less than or equal to a preset voltage.

2. The control circuit of claim 1,

the voltage detection circuit is also connected with a power supply detection pin of the low-voltage direct current motor control circuit and used for detecting the numerical relationship between the AD sampling value corresponding to the third voltage and a preset sampling value, wherein the numerical relationship is used for detecting whether the third voltage detects the first voltage is smaller than or equal to the preset voltage.

3. The control circuit of claim 2, wherein the voltage detection circuit is configured to:

if the AD sampling value corresponding to the third voltage is detected to be larger than the preset sampling value, determining that the third voltage is larger than the preset voltage; alternatively, the first and second electrodes may be,

and if the AD sampling value corresponding to the third voltage is detected to be less than or equal to the preset sampling value, determining that the third voltage is less than or equal to the preset voltage.

4. The control circuit of claim 1, wherein the low voltage dc motor control circuit further comprises:

the triode is connected with a power pin of the low-voltage direct current motor control circuit and is used for controlling the power-on and power-off of the low-voltage direct current motor;

and the relay is connected with the collector of the triode and used for controlling the switch of the low-voltage direct current motor to be switched on or switched off in a delayed mode.

5. The control circuit of claim 4, wherein the low voltage DC motor control circuit is configured to:

if the first voltage is less than or equal to the preset voltage, controlling the low-voltage direct current motor to be electrified by conducting a collector of the triode; alternatively, the first and second electrodes may be,

and if the first voltage is greater than the preset voltage, controlling the low-voltage direct current motor to be in a disconnected state by controlling the triode to be not conducted.

6. An electric machine, characterized in that the electric machine comprises a control circuit according to any one of claims 1-5.