CN110285553B - Air conditioner power metering method, power detection circuit and air conditioner - Google Patents
Air conditioner power metering method, power detection circuit and air conditioner Download PDFInfo
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- CN110285553B CN110285553B CN201910585907.1A CN201910585907A CN110285553B CN 110285553 B CN110285553 B CN 110285553B CN 201910585907 A CN201910585907 A CN 201910585907A CN 110285553 B CN110285553 B CN 110285553B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000004146 energy storage Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000011161 development Methods 0.000 abstract description 4
- 238000004378 air conditioning Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner power metering method, a power detection circuit and an air conditioner. The air conditioner power metering method is used for respectively calculating the power of each part of components of the air conditioner, so that the metering precision is improved. The invention clearly knows the power consumed by each part of the air conditioner outdoor unit by respectively calculating the power of each part of components of the air conditioner outdoor unit, and indicates the development of the air conditioner unit towards low cost, low power consumption and high performance.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner power metering method, a power detection circuit and an air conditioner.
Background
Most of the existing commercial air-conditioning compressors adopt variable-frequency compressors. When the frequency conversion compressor starts each time, the frequency conversion compressor firstly runs at the maximum power and the maximum air volume, so that the compressor runs under the state of low rotating speed and low energy consumption after the refrigeration equipment is quickly close to the set temperature, and the set temperature is maintained only at the required power. Therefore, the inverter compressor has become a trend of development of commercial refrigeration equipment.
At present, the frequency conversion compressor is developing towards the direction of high power density, low loss, low cost and high reliability. The air conditioning power is an important parameter for measuring the performance of the air conditioner, and particularly, the power of an air conditioner external unit occupies more than 90% of the total power of a commercial air conditioning unit. The existing inverter air conditioner has no function of calculating self consumed electric power, and if an external electric power metering device such as a power meter, an electricity meter and the like is adopted to detect the consumed electric power of the air conditioner, the cost of the air conditioner is increased. In addition, the conventional power calculation device considers the power consumption of the whole machine, and cannot accurately analyze the power consumption of each part of the air conditioner. Therefore, the high-precision air conditioner power measurement has important practical significance for the unit electric quantity measurement, the energy consumption evaluation of each part and the reduction of the power consumption.
Disclosure of Invention
The invention provides an air conditioner power metering method, a power detection circuit and an air conditioner using the method, which aim to improve the accuracy of air conditioner power metering.
The invention provides an air conditioner power metering method which is used for respectively calculating the power of each part of components of an air conditioner and improving the metering precision.
In the invention, the measurement of the power of the air conditioner outdoor unit comprises the power of a compressor driving plate and the power of a power supply rectifier bridge.
The power of the driving plate is the product of direct current bus current and bus voltage.
The power of the power supply rectifier bridge is the product of the square of the direct current bus current and the voltage stabilizing resistor between the output positive electrode and the output negative electrode of the rectifier bridge.
The invention also provides an air conditioner power detection circuit, which comprises a power supply rectifier bridge and a compressor drive plate which are connected in series, and further comprises a current sensor connected in series between the positive electrode and the negative electrode of the direct current bus, a voltage detection device connected in parallel between the positive electrode and the negative electrode of the direct current bus and a power calculation module.
The compressor driving plate comprises inverters IPM connected to a direct current bus in parallel, a first interface CN1 used for connecting the fan driving plate to the compressor driving plate, a second interface CN2 used for connecting a frequency converter switching power supply, a bus energy storage capacitor bank and a balance branch.
The bus energy storage capacitor group comprises three groups of capacitor branches connected in parallel, each capacitor branch is connected with two capacitors in series, the balance branch comprises four resistors connected in series, and a lead is led out between the two capacitors on each capacitor branch and is connected with the middle part of the balance branch.
Preferably, a reactor and a relay are connected in series in the negative bus connected to the dc output terminal of the power rectifier bridge, and the relay includes a first switch SW1, a second switch SW2 connected in series and then connected in parallel with the first switch SW1, and a voltage dividing resistor R.
Preferably, the dc output terminal of the power supply rectifier bridge is connected in parallel with a voltage stabilizing resistor.
The invention also provides an air conditioner which uses the air conditioner power metering method.
Compared with the prior art, the invention has the following beneficial effects:
the power of each part of components of the air conditioner outdoor unit is calculated respectively, so that the power of the high-precision air conditioner outdoor unit is obtained, and the power error is reduced to be within 3%; the power consumed by each part of the air conditioner external unit is clearly known, a direction is indicated for the development of the air conditioner unit towards low cost, low power consumption and high performance, and the method has important practical significance for increasing the functions of the unit, such as electric quantity metering and the like. The method provided by the invention can accurately evaluate the power consumption of each part of the air conditioner, and improves the market competitiveness of products.
Drawings
Fig. 1 is a power calculation topological diagram of a power supply circuit of an air conditioner external unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, the power circuit of the outdoor unit of the air conditioner includes a power bridge portion and a compressor driving plate portion.
The rectifier bridge part is formed by connecting three groups of rectifier diode branches in parallel and a voltage stabilizing resistor in parallel, each rectifier diode branch is formed by connecting two rectifier diodes in series, conducting wires L1, L2 and L3 led out from the middles of the two rectifier diodes connected in series in each rectifier diode branch are input ends of three-phase alternating current of the rectifier bridge, two ends of each rectifier diode branch of the three groups are output by a direct current bus, P is the positive electrode of the output end of the rectifier bridge, N is the negative electrode of the output end of the rectifier bridge, and the three-phase alternating current is rectified into direct current through the rectifier bridge. The voltage stabilizing resistors connected in parallel on the positive and negative electrodes of the output end of the rectifier bridge play a role in stabilizing the voltage of the power supply. The driving board part is a dashed frame part in fig. 1, and comprises an inverter IPM, a first interface CN1, a second interface CN2, a bus energy storage capacitor bank and a balance resistor, which are connected in parallel to each other on a bus. The IPM provides power for the compressor, the first interface CN1 is a connection interface of the fan drive board on the compressor drive board, and the second interface CN2 is a connection interface of the frequency converter switch power supply. The bus energy storage capacitor group comprises three groups of capacitor branches connected in parallel, and each branch is provided with two capacitors. The balance branch comprises four resistors connected in series, and the resistors can consume part of electric energy stored by the energy storage capacitor bank when the air conditioner is stopped. A lead is led out between two capacitors on each capacitor branch circuit and is connected with the middle part of the balance branch circuit. When the air conditioner starts to work, the energy storage capacitor bank on the driving plate starts to be charged and discharged rapidly so as to provide sufficient and stable voltage for the compressor and the fan. The resistor on the balancing branch circuit can prevent the energy storage capacitor bank from generating overhigh voltage to damage the air conditioning equipment in the discharging process.
And a reactor and a relay are connected in series in a negative bus connected with the direct current output end of the power supply rectifier bridge. The reactor can filter higher harmonics in the circuit, and plays a role in filtering. The relay comprises a first switch SW1, a second switch SW2 and a voltage dividing resistor R, wherein the second switch SW2 and the voltage dividing resistor R are connected in series and then connected with the first switch SW1 in parallel, and the circuit is subjected to overvoltage protection.
The air conditioner power metering method provided by the invention respectively calculates the power of each part of components of the air conditioner so as to improve the metering precision.
According to the control principle of the air conditioner external unit, the power of the air conditioner external unit comprises the power of a driving plate of a compressor and the power of a power supply rectifier bridge, and the power generated by the inductance characteristic of the reactor L is reactive power and is not counted in the calculation of the power of the air conditioner external unit. In order to accurately calculate the power of each part, the invention connects a current sensor between the positive and negative poles of the bus in series, connects a voltage detection device between the positive and negative poles of the bus in parallel, and also comprises a power metering module. In the embodiment shown in fig. 1, a current sensor is connected in series between the negative electrode N of the output end of the rectifier bridge and the reactor L for collecting the dc bus current, and a voltage detection device is connected in parallel to the positive electrode and the negative electrode of the bus for collecting the dc bus voltage. The power of the drive plate is the product I of the DC bus current and the bus voltageFemaleVFemaleI.e. the power of the dashed box in fig. 1. The power obtained by the part not only comprises the power of the compressor, but also comprises the power of the fan, the frequency converter and the switching power supply. The rectifier bridge is conducted with the rectifier diode and the voltage stabilizing resistor to have partial energy loss, and the resistance value of the voltage stabilizing resistor connected in parallel with the positive electrode and the negative electrode of the output end of the rectifier bridge is fixed and known, so that the power of the rectifier bridge is the product I of the square of the direct current bus current and the resistance between the positive electrode and the negative electrode of the output end of the rectifier bridge2R。The power metering module can accurately calculate the power of the rectifier bridge and the drive plate according to the collected bus current and voltage.
The power of the air conditioner outdoor unit is the sum of the power of the driving plate and the power of the rectifier bridge, and the power of the air conditioner outdoor unit accounts for more than 90% of the total power of the commercial air conditioner unit, so that the power of the high-precision air conditioner outdoor unit is obtained by respectively calculating the power of each part of components of the air conditioner outdoor unit, and the power error is reduced to be within 3%. The power calculation method provided by the invention can clearly know the power consumed by each part of the air conditioner external unit, indicates the direction for the development of the air conditioner unit towards low cost, low power consumption and high performance, and has important practical significance for increasing the functions of the unit electric quantity metering and the like.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (7)
1. The method for measuring the power of the air conditioner outdoor unit is characterized in that the power of the air conditioner outdoor unit is the sum of the power of a compressor driving plate and the power of a power supply rectifier bridge, wherein:
the power of a compressor driving plate comprises the power of a compressor, the power of a fan, a frequency converter and a switching power supply, and the calculation method is the product of direct current bus current and bus voltage;
the power of the power supply rectifier bridge is the product of the square of the direct current bus current and the voltage stabilizing resistance between the output positive electrode and the output negative electrode of the rectifier bridge.
2. The power detection circuit of the air conditioner external unit comprises a power supply rectifier bridge and a compressor driving plate which are connected in series, and is characterized by comprising a current sensor connected in series between a positive electrode and a negative electrode of a direct-current bus, a voltage detection device connected in parallel between the positive electrode and the negative electrode of the direct-current bus and a power calculation module.
3. The power sensing circuit of claim 2, wherein said compressor drive board comprises an inverter IPM connected in parallel to each other on a dc bus, a first interface CN1 for connecting a fan drive board to the compressor drive board, a second interface CN2 for inverter switching power supply connection, and a bus energy storage capacitor bank and a balancing branch.
4. The power detection circuit according to claim 3, wherein the bus energy storage capacitor bank comprises three groups of capacitor branches connected in parallel, each capacitor branch is connected with two capacitors in series, the balancing branch comprises four resistors connected in series, and a conducting wire is led out between the two capacitors on each capacitor branch and connected with the middle part of the balancing branch.
5. The power detection circuit as claimed in claim 2, wherein a reactor and a relay are connected in series in a negative bus connected to the dc output terminal of the power rectifier bridge, and the relay includes a first switch SW1, and a second switch SW2 and a voltage dividing resistor R connected in series and connected in parallel with the first switch SW 1.
6. The power detection circuit as claimed in claim 2, wherein a voltage stabilizing resistor is connected in parallel with the dc output terminal of the power rectifier bridge.
7. An air conditioner, characterized in that the air conditioner uses the method for measuring power of an outdoor unit of the air conditioner as set forth in claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910585907.1A CN110285553B (en) | 2019-07-01 | 2019-07-01 | Air conditioner power metering method, power detection circuit and air conditioner |
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| CN201910585907.1A CN110285553B (en) | 2019-07-01 | 2019-07-01 | Air conditioner power metering method, power detection circuit and air conditioner |
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| CN110285553B true CN110285553B (en) | 2020-12-29 |
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| CN112984739B (en) * | 2021-04-08 | 2022-03-18 | 珠海格力电器股份有限公司 | Air conditioner control method, air conditioner control device, air conditioner and storage medium |
| CN115912899B (en) * | 2023-02-20 | 2023-05-23 | 广东东菱电源科技有限公司 | Capacitor series voltage dividing circuit |
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| JP3866120B2 (en) * | 2002-03-04 | 2007-01-10 | 三菱電機株式会社 | Air conditioner drive circuit |
| CN102857087B (en) * | 2012-09-17 | 2015-01-14 | 海信（山东）空调有限公司 | Adaptive control method of power factor |
| CN104181385B (en) * | 2013-05-24 | 2018-02-02 | 广东美的制冷设备有限公司 | The electric energy detection method and electric energy detection device of air conditioner |
| CN104251522B (en) * | 2013-06-28 | 2019-04-26 | 珠海格力电器股份有限公司 | Air conditioner electrical box assembly and air conditioner outdoor unit thereof |
| CN105068040B (en) * | 2015-09-11 | 2018-11-13 | 珠海格力电器股份有限公司 | Electric energy metering device and household appliance using same |
| CN106771783B (en) * | 2017-02-14 | 2023-08-18 | 英孚康（浙江）工业技术有限公司 | Health monitoring circuit of direct current bus capacitor bank |
| CN108458457B (en) * | 2018-04-28 | 2020-12-01 | 广东美的制冷设备有限公司 | Variable frequency air conditioner circuit board and variable frequency air conditioner |
| CN109374963B (en) * | 2018-09-30 | 2021-09-28 | 四川长虹空调有限公司 | Air conditioner electric quantity calculation method |
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