CN114839435A - Electric quantity metering and displaying circuit of electric appliance, controller and electric appliance - Google Patents

Abstract

The application relates to an electrical power metering and display circuit, a controller and an electrical appliance. The electrical power metering and display circuit includes a central control unit, a current detection conversion unit, a load input voltage acquisition unit and a display unit, and the current detection conversion unit is used for collecting electrical appliances. The input current of the internal load, the load input voltage acquisition unit is used to collect the input voltage of the internal load of the electrical appliance, and the central control unit is respectively connected with the current detection and conversion unit, the load input voltage acquisition unit and the display unit, and is used for according to the internal load of the electrical appliance. The power consumption of the appliance is calculated from the input current and the input voltage of the internal load of the appliance, and the display unit is used to display the power consumption of the appliance. The present application integrates the electricity metering inside the electrical appliance, and directly displays the actual power consumption on the electrical appliance, so that the user can intuitively perceive the energy saving of the electrical appliance, and use the energy-saving electrical appliance for promotion and application.

Description

Electric power metering and display circuits, controllers and appliances

technical field

The present application belongs to the technical field of intelligent electrical appliances, and in particular relates to an electrical power metering and display circuit, a controller and an electrical appliance.

Background technique

With the advancement of science and technology, electrical products are constantly updated, and various functions are readily available. Among them, energy saving and environmental protection have been the focus of attention. At present, many energy-saving air-conditioning units or other electrical products on the market advertise energy saving and power saving, but because users cannot intuitively perceive and see the actual power consumption of each electrical appliance with their own eyes, they cannot be advertised by users or users. accepted. In the related art, the electric energy meter is used to measure the electric energy consumption of electrical appliances. Since the electric energy meter counts the electric energy consumed by all the electrical appliances in a set of rooms, it cannot count the electric energy consumption of each electrical appliance individually. Therefore, it cannot make the user perceive whether the electrical appliance is energy-saving or not, which is not conducive to Promotion and application of electrical appliances.

SUMMARY OF THE INVENTION

In order to at least to a certain extent overcome the problem that users cannot perceive the actual energy consumption of traditional electrical appliances due to the lack of electricity metering and display functions, the present application provides an electrical electricity metering and display circuit, a controller and an electrical appliance.

In a first aspect, the present application provides an electrical power metering and display circuit, including:

Central control unit, current detection conversion unit, load input voltage acquisition unit and display unit;

The current detection conversion unit is used to collect the input current of the internal load of the electrical appliance;

The load input voltage acquisition unit is used to collect the input voltage of the internal load of the electrical appliance;

The central control unit is respectively connected with the current detection conversion unit, the load input voltage acquisition unit and the display unit, and is used for calculating the power consumption of the electrical appliance according to the input current of the internal load of the electrical appliance and the input voltage of the internal load of the electrical appliance;

The display unit is used for displaying the power consumption of the electrical appliance.

Further, it also includes a drive module, and the drive module includes:

Rectifier bridge, driver chip, inverter and DC bus;

the rectifier bridge and the driving chip are connected through the DC bus;

The rectifier bridge rectifies the input voltage of the electrical appliance into a two-phase voltage, and the DC bus transmits the two-phase voltage to the driving chip to supply power for the driving chip;

The drive chip is used to convert the control signal sent by the central control unit into the drive signal of the inverter;

The inverter is used for outputting a three-phase voltage according to the driving signal, and the three-phase voltage is used for supplying power to the internal load of the electrical appliance.

Further, the load input voltage acquisition unit is configured to acquire the input voltage of the driving chip.

Further, the current detection and conversion unit is further configured to convert the current signal on the DC bus into a voltage signal satisfying the working voltage range of the central control unit.

Further, it also includes:

A first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are used to divide the voltage of the low voltage signal, so that the voltage signal input to the central control unit satisfies the Input signal range of the central control unit.

Further, it also includes a protection module, and the protection module includes:

a first power supply, a second power supply, a comparator and a triode;

the first power supply is used to provide a comparison voltage for the comparator;

the second power supply is used to provide a supply voltage for the central control unit;

The input end of the comparator is connected with the current detection conversion unit,

The output end of the comparator is connected with the input end of the triode and the driver chip;

The first output end of the triode is connected to the second power supply, and the second output end of the triode is grounded;

When the low-voltage voltage output by the current detection conversion unit is higher than the comparison voltage, the output terminal of the comparator outputs a high-level signal;

After receiving the high-level signal, the driving chip stops outputting the driving signal;

The triode is turned on after receiving the high-level signal, so that the power input terminal of the central control unit is grounded.

Further, the central control unit is also used to send fault information when the power input terminal is grounded;

The display unit is also used for displaying the fault information.

Further, the protection module also includes:

The third voltage dividing resistor and the fourth voltage dividing resistor;

The third voltage dividing resistor and the fourth voltage dividing resistor are used to divide the voltage of the first power supply to obtain the comparison voltage of the comparator.

Further, the protection module also includes:

a first short-circuit protection resistor, a second short-circuit protection resistor and a third short-circuit protection resistor;

the first short-circuit protection resistor is arranged between the second power supply and the ground wire;

the second short-circuit protection resistor is arranged between the central control unit and the ground wire;

The third short-circuit protection resistor is arranged between the comparator and the triode.

Further, the current detection conversion unit is:

Current sensor or sampling resistor.

In a second aspect, the present application provides a controller, including:

The electrical power metering and display circuit according to the first aspect.

In a third aspect, the application provides an electrical appliance, comprising:

The controller of the second aspect.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

The electrical power metering and display circuit, the controller, and the electrical appliance provided by the embodiments of the present invention, the electrical power metering and display circuit includes a central control unit, a current detection conversion unit, a load input voltage acquisition unit, and a display unit, and the current detection conversion unit is used for collecting The input current of the internal load of the electrical appliance, the load input voltage acquisition unit is used to collect the input voltage of the internal load of the electrical appliance, and the central control unit is respectively connected with the current detection and conversion unit, the load input voltage acquisition unit and the display unit, and is used to measure the internal load of the electrical appliance. The input current of the electrical appliance and the input voltage of the internal load of the electrical appliance are used to calculate the power consumption of the electrical appliance, and the display unit is used to display the electrical power consumption of the electrical appliance. Users can intuitively perceive the energy-saving properties of electrical appliances, and use energy-saving electrical products to promote their applications.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not limiting of the present application.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

FIG. 1 is a functional structural diagram of an electrical power metering and display circuit according to an embodiment of the present application.

FIG. 2 is a circuit diagram of a conventional single-stage electrical power metering and display circuit according to an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the examples in this application, all other implementations obtained by those of ordinary skill in the art without creative work fall within the scope of protection of this application.

FIG. 1 is a functional structure diagram of an electrical power metering and display circuit provided by an embodiment of the application. As shown in FIG. 1 , the electrical power metering and display circuit includes:

Central control unit 11, current detection conversion unit 12, load input voltage acquisition unit 13 and display unit 14;

The current detection and conversion unit 12 is used to collect the input current of the internal load of the electrical appliance;

The load input voltage collection unit 13 is used to collect the input voltage of the internal load of the electrical appliance;

The central control unit 11 is respectively connected with the current detection conversion unit 12, the load input voltage acquisition unit 13 and the display unit 14, and is used for calculating the power consumption of the electrical appliance according to the input current of the internal load of the electrical appliance and the input voltage of the internal load of the electrical appliance;

For example, the central control unit 11 can calculate the power consumed by the electrical appliance according to power P=voltage U*current I, and power W=power P*time T.

The display unit 14 is used to display the power consumption of the electrical appliance.

Traditionally, the electric energy meter is used to measure the electric energy consumption of electrical appliances. Since the electric energy meter counts the electricity consumed by all electrical appliances in a set of rooms, it cannot count the electrical energy consumption of each electrical appliance alone. Therefore, it cannot make the user perceive whether the electrical appliance is energy-saving or not, which is not conducive to the electrical energy consumption of the electrical appliance. Promote the application.

In this embodiment, the electric power metering and display circuit includes a central control unit, a current detection conversion unit, a load input voltage acquisition unit, and a display unit. The current detection conversion unit is used to collect the input current of the internal load of the electric appliance, and the load input voltage acquisition unit is used for In order to collect the input voltage of the internal load of the electrical appliance, the central control unit is respectively connected with the current detection conversion unit, the load input voltage acquisition unit and the display unit, and is used to calculate the electrical appliance according to the input current of the internal load of the electrical appliance and the input voltage of the internal load of the electrical appliance. The power consumption, the display unit is used to display the power consumption of the electrical appliance, integrate the power metering into the electrical appliance, and directly display the actual power consumption on the electrical appliance, so that the user can intuitively perceive the energy saving of the electrical appliance, and promote the use of energy-saving electrical appliances. application.

FIG. 2 is a circuit diagram of an electrical power metering and display circuit provided by an embodiment of the application. As shown in FIG. 2 , on the basis of the previous embodiment, the electrical power metering and display circuit includes:

A drive module, the drive module includes:

rectifier bridge 21, drive chip 22, inverter 23 and DC bus 24;

The rectifier bridge 21 is connected with the driving chip 22 through the DC bus 24;

The rectifier bridge 21 rectifies the input voltage of the electrical appliance into a two-phase voltage, and the DC bus 24 transmits the two-phase voltage to the driving chip 22 to supply power to the driving chip 22;

The drive chip 22 is used to convert the control signal sent by the central control unit into the drive signal of the inverter 23;

The inverter 23 is used to output a three-phase voltage according to the driving signal, and the three-phase voltage is used to supply power to the internal load of the appliance.

The drive chip 22 is connected to the inverter 23 through a drive signal line, and a three-phase electric drive circuit composed of the drive chip, the three-phase six-way IGBT inverter and the load is used to control the operation of the three-phase electric load such as a motor.

In this embodiment, the three-phase electrical input of the grid is rectified into a two-phase voltage through a rectifier bridge, and transmitted through the DC bus. It is converted into the driving signal of IGBT, so that the six-way IGBT work completes the process of inverting into three-phase power, and provides the working power supply of the motor load, so that the motor load can operate normally.

In this embodiment, the load input voltage collection unit is used to collect the input voltage of the driving chip 22 .

The current sampling of the DC bus and the input voltage of the driver chip are sampled, and the central control unit calculates and displays the power consumed during the operation of the circuit. Makes electricity metering more accurate.

In this embodiment, the current detection and conversion unit is further configured to convert the current signal on the DC bus into a voltage signal that satisfies the working voltage range of the central control unit.

The electrical power metering and display circuit also includes: a first voltage dividing resistor R1 and a second voltage dividing resistor R2, and R1 and R2 are used to divide the low-voltage signal, so that the voltage signal input to the central control unit meets the requirements of the central control unit. Input signal range.

The current detection and conversion unit is, for example, a current sensor. The low-voltage signal outputs a signal through pin 3 of the current sensor. Through the voltage divider resistors of R1 and R2, the voltage signal or current signal is converted into a range that can be recognized by the central control unit, and the current value can be directly read. .

Since the input voltage signal or current signal of the central control unit is relatively small, the output signal of the current sensor can be made to meet the input signal requirements of the central control unit through the voltage dividing resistor.

The electrical power metering and display circuit also includes a protection module, including:

a first power supply 25, a second power supply 26, a comparator 27 and a triode 28;

The first power supply 25 is used to provide a comparison voltage for the comparator 27;

The second power supply 26 is used to provide a power supply voltage for the central control unit;

The input end of the comparator 27 is connected with the current detection conversion unit,

In this embodiment, the current detection and conversion unit is, for example, a current sensor, which is arranged on the P terminal of the DC bus, collects the current signal at the P terminal, and converts it into a voltage signal. Since the voltage of the DC bus is very high, the current sensor converts After the low-voltage signal is converted into a low-voltage signal, it can be directly used by the comparator, thereby saving the cost of the voltage conversion device.

The output end of the comparator 27 is connected with the input end of the transistor 28 and the driver chip 21;

The first output end of the triode 28 is connected to the second power supply 26, and the second output end of the triode 28 is grounded;

When the low-voltage voltage output by the current detection conversion unit is higher than the comparison voltage, the output terminal of the comparator 27 outputs a high-level signal;

After the driving chip 21 receives the high-level signal, it stops outputting the driving signal;

The triode 28 is turned on after receiving the high-level signal, so that the power input terminal of the central control unit is grounded;

The central control unit is also used to send fault information when the power input terminal is grounded;

The display unit is also used to display fault information.

In some embodiments, the protection module further includes:

The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4;

The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are used to divide the voltage of the first power supply 25 to obtain the comparison voltage of the comparator 27 .

Since the comparison voltage is small, the comparison voltage that meets the requirements of the comparator can be obtained after passing through the power supply and the voltage dividing resistor.

In some embodiments, the protection module further includes:

a first short-circuit protection resistor R7, a second short-circuit protection resistor R6 and a third short-circuit protection resistor R5;

The first short-circuit protection resistor R7 is arranged between the second power supply 26 and the ground wire; when the transistor 28 is turned on, the second power supply 26 has a risk of grounding, so the second power supply can be avoided by setting the first short-circuit protection resistor R7 26 Short circuit damage.

The second short-circuit protection resistor R6 is arranged between the central control unit and the ground wire;

When the triode 28 is turned on, the central control unit is at risk of being grounded, so by setting the second short-circuit protection resistor R6, short-circuit damage to the central control unit can be avoided.

The third short-circuit protection resistor R5 is provided between the comparator 27 and the transistor 28 .

When the transistor 28 is turned on, the comparator 27 is at risk of being grounded, so by setting the third short-circuit protection resistor R5, the short-circuit damage of the comparator can be avoided.

On the basis of realizing electricity metering and displaying electricity consumption, this application can also realize circuit overcurrent protection. The working principle of the circuit includes: when an overcurrent phenomenon occurs in the driving circuit, a large current signal is output through the 3-pin of the current sensor, and compared from U1 The positive terminal of the comparator is input, and the negative terminal is the input terminal of the comparison signal. The 5V power supply provides a comparison voltage to the negative terminal of the comparator through the voltage division of R3 and R4. When the voltage signal of the large current exceeds the voltage of the comparison terminal, the output of the comparator is high. level (low level is output when there is no overcurrent), at this time, the high level signal transmits the signal to the driver chip through the CIN pin, and turns off the driver signal output of the driver chip, so that the IGBT and the back-end load stop working, and at the same time, the comparator output The high level of the NPN transistor is turned on, so that the 3.3V high level signal of the original FO port of the central control unit is pulled to the ground through R7 and the transistor, and the FO level signal of the power input port is pulled low, triggering the fault of the central control unit , and turn off the PWM output at the same time, because the PWM control signal is lost, the driver chip also stops outputting the driving signal, and the load also stops working, achieving the effect of overcurrent protection.

It should be noted that the combination of electricity metering and overcurrent protection circuits provided in this application can be used in different circuits, not only in single-phase three-phase drive circuits, but also in other circuits that require sampling. .

In some embodiments, the current detection and conversion unit may also be a sampling resistor or other devices that convert current into voltage, which is not limited in this application.

In this embodiment, the current sensor realizes the functions of electricity metering and overcurrent protection, which can display the electricity consumed by the air conditioner unit in use, and is matched with an overcurrent protection circuit to prevent overcurrent from damaging components in the circuit and improve the reliability of the drive circuit. . Since only one current sensor is used in the electricity metering and overcurrent protection circuit, the cost of the main board can be reduced, and the electricity consumption can be visualized in the visualization of the electric energy consumed during the operation of the circuit, which directly reflects the energy saving of the electrical appliance.

An embodiment of the present invention provides a controller, including:

The electrical power metering and display circuit as described in the above-mentioned embodiments.

Embodiments of the present invention provide an electrical appliance, including: the controller described in the foregoing embodiments.

In some embodiments, the electrical appliance is, for example, an air conditioner.

It can be understood that, the same or similar parts in the above embodiments may refer to each other, and the content not described in detail in some embodiments may refer to the same or similar content in other embodiments.

It should be noted that, in the description of the present application, the terms "first", "second" and the like are only used for the purpose of description, and should not be construed as indicating or implying relative importance. Also, in the description of this application, unless otherwise specified, the meaning of "plurality" means at least two.

Any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the present application includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present application belong.

It should be understood that various parts of this application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

It should be noted that the present invention is not limited to the above-mentioned best embodiment, and those skilled in the art can obtain other various forms of products under the inspiration of the present invention, but no matter if any changes are made in its shape or structure, any The technical solutions that are the same as or similar to those of the present application all fall within the protection scope of the present invention.

Claims (12)

1. An electric quantity metering and displaying circuit of an electric appliance is characterized by comprising:

the device comprises a central control unit, a current detection and conversion unit, a load input voltage acquisition unit and a display unit;

the current detection and conversion unit is used for collecting input current of an internal load of an electrical appliance;

the load input voltage acquisition unit is used for acquiring the input voltage of the internal load of the electrical appliance;

the central control unit is respectively connected with the current detection and conversion unit, the load input voltage acquisition unit and the display unit and is used for calculating the electric quantity consumed by the electric appliance according to the input current of the internal load of the electric appliance and the input voltage of the internal load of the electric appliance;

the display unit is used for displaying the electric quantity consumed by the electric appliance.

2. The electric appliance electricity metering and displaying circuit of claim 1, further comprising a driving module, the driving module comprising:

the system comprises a rectifier bridge, a drive chip, an inverter and a direct current bus;

the rectifier bridge is connected with the driving chip through the direct current bus;

the rectifier bridge rectifies the input voltage of the electric appliance into two-phase voltage, and the direct current bus transmits the two-phase voltage to the driving chip to supply power for the driving chip;

the driving chip is used for converting the control signal sent by the central control unit into a driving signal of the inverter;

the inverter is used for outputting three-phase voltage according to the driving signal, and the three-phase voltage is used for supplying power to an internal load of the electric appliance.

3. The electric appliance electricity metering and displaying circuit of claim 2, wherein the load input voltage collecting unit is configured to collect the input voltage of the driving chip.

4. The electric appliance electricity quantity metering and displaying circuit of claim 1, wherein the current detection converting unit is further configured to convert a current signal on a dc bus into a voltage signal that satisfies an operating voltage range of the central control unit.

5. The electric appliance electricity metering and displaying circuit of claim 4, further comprising:

the first voltage-dividing resistor and the second voltage-dividing resistor are used for dividing the low-voltage signal so that the voltage signal input into the central control unit meets the input signal range of the central control unit.

6. The electric appliance electricity metering and displaying circuit of claim 4, further comprising a protection module, wherein the protection module comprises:

the power supply comprises a first power supply, a second power supply, a comparator and a triode;

the first power supply is used for providing comparison voltage for the comparator;

the second power supply is used for providing power supply voltage for the central control unit;

the input end of the comparator is connected with the current detection conversion unit,

the output end of the comparator is connected with the input end of the triode and the driving chip;

the first output end of the triode is connected with the second power supply, and the second output end of the triode is grounded;

when the low-voltage output by the current detection conversion unit is higher than the comparison voltage, the output end of the comparator outputs a high-level signal;

the driving chip stops outputting the driving signal after receiving the high level signal;

and the triode is conducted after receiving the high level signal, so that the power supply input end of the central control unit is grounded.

7. The electrical apparatus electricity metering and displaying circuit of claim 6, wherein the central control unit is further configured to send a fault message when the power input terminal is grounded:

the display unit is also used for displaying the fault information.

8. The electric appliance electricity metering and displaying circuit of claim 6, wherein the protection module further comprises:

a third voltage dividing resistor and a fourth voltage dividing resistor;

the third voltage dividing resistor and the fourth voltage dividing resistor are used for dividing the voltage of the first power supply to obtain a comparison voltage of the comparator.

9. The electric appliance electricity metering and displaying circuit of claim 6, wherein the protection module further comprises:

a first short-circuit protection resistor, a second short-circuit protection resistor and a third short-circuit protection resistor;

the first short-circuit protection resistor is arranged between the second power supply and the ground wire;

the second short-circuit protection resistor is arranged between the central control unit and the ground wire;

the third short-circuit protection resistor is arranged between the comparator and the triode.

10. The electric appliance electricity quantity metering and displaying circuit of claim 1, wherein the current detection converting unit is:

a current sensor or a sampling resistor.

11. A controller, comprising:

the electric appliance electricity metering and displaying circuit of any one of claims 1 to 10.

12. An electrical appliance, comprising:

the controller of claim 11.

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