Circuit, power processing method of circuit and air conditioner

Abstract

The embodiment of the invention provides a circuit, a power processing method of the circuit and an air conditioner, the circuit comprises a power factor correction circuit, a load, a voltage division circuit and a processor, the power factor correction circuit comprises a first rectifier bridge, the voltage division circuit comprises a second rectifier bridge, and the processor is used for determining a target processing strategy from multiple preset processing strategies; taking the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as a target voltage according to a target processing strategy; according to the embodiment of the invention, the output voltages of different rectifier bridges are selected as the target voltages according to different processing strategies, so that the processor can flexibly select the corresponding power processing method according to the load condition, and compared with a power calculation mode in the prior art, the power calculation method provided by the invention is beneficial to improving the accuracy of power calculation.

Description

Technical Field

[0001] The present invention relates to the technical field of circuits, and in particular to a circuit, a power processing method of the circuit, and an air conditioner. Background Art

[0002] At present, more and more users are concerned about the power consumed by the air conditioner outdoor unit. Generally, three types of power are involved in the power calculation of the air conditioner circuit: active power, reactive power, and apparent power. Among them, apparent power includes active power and reactive power, which is obtained by multiplying the effective voltage and the effective current. In the PFC (Power Factor Correction) circuit, there are some problems with the commonly used power calculation method. Different load overload conditions will have different effects on the sampled voltage, thereby affecting the power calculation. The opening of the PFC will also cause changes in the power factor, resulting in a large difference between the power calculated by the program and the actual power consumed by the outdoor unit. Summary of the invention

[0003] In view of the above problems, embodiments of the present invention are proposed to provide a circuit and a power processing method of the circuit and an air conditioner that overcome the above problems or at least partially solve the above problems.

[0004] In order to solve the above problem, an embodiment of the present invention discloses a circuit, wherein the circuit comprises:

[0005] A power factor correction circuit is connected to a power supply; the power factor correction circuit comprises a first rectifier bridge and a power factor corrector; the first rectifier bridge is used to receive the alternating current output by the power supply and convert the alternating current into direct current;

[0006] A load connected to the power factor correction circuit and configured to receive the direct current output by the power factor correction circuit;

[0007] A voltage divider circuit is connected in parallel with the power factor correction circuit; the voltage divider circuit includes a second rectifier bridge, which is used to receive the alternating current output by the power supply and convert the alternating current into direct current;

[0008] A processor is used to obtain the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply; determine a target processing strategy from multiple preset processing strategies based on the current of the load and the power supply voltage and power supply current of the power supply; according to the target processing strategy, use the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage; and determine the power of the load based on the target voltage.

[0009] Optionally, the processor is used to determine a target processing strategy from multiple preset processing strategies based on a comparison result of the load current with a preset load current value, a comparison result of the power supply voltage with a preset power supply voltage value, and a comparison result of the power supply current with a preset power supply current value.

[0010] Optionally, the multiple preset processing strategies include a first processing strategy, which is to select the output voltage of the first rectifier bridge as the target processing voltage; the processor is used to use the first processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

[0011] Optionally, the multiple preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge; the output voltage of the first rectifier bridge after the increase is used as the target voltage; the processor is used to use the second processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

[0012] Optionally, the multiple preset processing strategies further include a third processing strategy, and the third processing strategy is a processing strategy for selecting the output voltage of the second rectifier bridge as the target processing voltage; the processor is used to use the third processing strategy as the target processing strategy when the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value;

[0013] When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0014] When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0015] When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0016] When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0017] When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

[0018] On the other hand, an embodiment of the present invention provides a power processing method of a circuit, the method comprising:

[0019] Acquire the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply;

[0020] Determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply;

[0021] According to the target processing strategy, the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge is used as the target voltage;

[0022] The power of the load is determined according to the target voltage.

[0023] Optionally, determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes:

[0024] According to the comparison result between the load current and the preset load current value, the comparison result between the power supply voltage and the preset power supply voltage value, and the comparison result between the power supply current and the preset power supply current value, a target processing strategy is determined from multiple preset processing strategies.

[0025] Optionally, the multiple preset processing strategies include a first processing strategy, wherein the first processing strategy is to select the output voltage of the first rectifier bridge as the target processing voltage; and the target processing strategy is determined from the multiple preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply, including:

[0026] When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the first processing strategy is used as the processing strategy.

[0027] Optionally, the plurality of preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge, and the output voltage of the first rectifier bridge after the increase is used as the target voltage;

[0028] The step of determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes:

[0029] When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the second processing strategy is used as a target processing strategy.

[0030] Optionally, the plurality of preset processing strategies further include a third processing strategy, wherein the third processing strategy is to select the output voltage of the second rectifier bridge as the target processing voltage;

[0031] The step of determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes:

[0032] When the load current is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0033] When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0034] When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0035] When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0036] When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0037] When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

[0038] On the other hand, an embodiment of the present invention further provides an air conditioner, comprising any one of the circuits described in the above embodiments.

[0039] The embodiment of the present invention divides the circuit into a power factor correction circuit and a voltage divider circuit by setting a voltage divider circuit; the voltage divider circuit can ensure that when the load overload condition is complex, resulting in inaccurate input voltage and input current sampled by the power factor correction circuit, the actual input voltage and current can be accurately obtained from the voltage divider circuit, thereby improving the accuracy of power calculation, and multiple power calculation strategies are preset in the processor, so that the processor can flexibly select the corresponding power processing method according to the load condition. Compared with the power calculation method of the prior art, the embodiment of the present invention helps to improve the accuracy of power calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of a circuit structure of an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the structure of another circuit according to an embodiment of the present invention;

[0042] Figure 3 is a flow chart of the steps of a method for calculating power of a circuit according to an embodiment of the present invention;

[0043] Figure 4 It is a flowchart of the steps of another method for calculating power of a circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] One of the core concepts of the embodiments of the present invention is that:

[0046] By setting up a voltage divider circuit to divide the working circuit into the isolation measurement side and the power side, the impact of the overload of the load in the circuit on the sampling voltage in the traditional technology of the air conditioner is reduced. Combined with a variety of preset processing strategies, the power side sampling data or the isolation side sampling data can be flexibly selected to make the power calculation result more accurate.

[0047] Reference Figure 1 , shows a schematic diagram of the structure of a circuit according to an embodiment of the present invention, which may specifically include:

[0048] A power factor correction circuit 20 is connected to the power supply 10; the power factor correction circuit 20 includes a first rectifier bridge (not shown in the figure) and a power factor corrector (not shown in the figure); the first rectifier bridge is used to receive the alternating current output by the power supply and convert the alternating current into direct current;

[0049] Among them, the rectifier bridge is a circuit element that uses the conduction and cutoff characteristics of a diode to convert alternating current into direct current, and is generally composed of a number of diodes. The power factor correction circuit module is a circuit module that includes a power factor corrector. The power factor corrector (PFC) mainly controls the waveform of the input current to synchronize it with the input voltage waveform, improve the power factor, and reduce the harmonic content. It can solve the electromagnetic interference (EMl) and electromagnetic compatibility (EMC) problems caused by severe distortion of the current waveform due to capacitive loads. The power factor refers to the relationship between effective power and apparent power. The power factor is used to measure the degree to which electricity is effectively utilized. The larger the power factor value, the higher the utilization rate of electricity in the circuit.

[0050] A load 40, connected to the power factor correction circuit 20, and configured to receive the direct current output by the power factor correction circuit 20;

[0051] The load 40 may be a circuit including circuit operating service components, such as a compressor or other components.

[0052] The voltage divider circuit 30 is connected in parallel with the power factor correction circuit; the voltage divider circuit 30 includes a second rectifier bridge (not shown in the figure), which is used to receive the alternating current output by the power supply 10 and convert the alternating current into direct current; the voltage divider circuit 30 is connected in parallel with the power factor correction circuit 20, receives the alternating current output by the power supply through the second rectifier bridge and converts it into direct current.

[0053] The voltage divider circuit 30 can ensure that the input voltage of the circuit can be accurately obtained when the load changes or the grid voltage fluctuates.

[0054] A processor (not shown in the figure) is used to obtain the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply; determine a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply; according to the target processing strategy, use the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage; and determine the power of the load according to the target voltage.

[0055] The processor is a processing module including a microcontroller unit (MCU), which is responsible for executing the main logic control instructions of the appliance, processing the user's input signals, and managing the communication with other modules. By storing a number of preset processing strategies in the micro-manager in the air-conditioning circuit, the power processing method can be closer to the actual situation and the calculation results can be more accurate.

[0056] In one embodiment, the power factor correction circuit may further include a first sampling module, one end of which is connected to the first rectifier bridge and the other end is grounded, and is used to collect the output voltage of the first rectifier bridge.

[0057] In one example, the first sampling module can be connected to an ADC (Analog-to-Digital Converter) pin of the processor to provide the level of the output voltage of the first rectifier bridge. The present invention does not limit the structure and connection method of the sampling module.

[0058] In one embodiment, the voltage divider circuit may further include a second sampling module, one end of which is connected to the second rectifier bridge and the other end is grounded, and is used to collect the output voltage of the second rectifier bridge.

[0059] In one example, the second sampling module can be connected to another ADC pin of the processor to provide the level of the output voltage of the second rectifier bridge. The present invention does not limit the structure and connection method of the sampling module.

[0060] In one embodiment, the circuit further includes a third sampling module connected in parallel with the power supply and configured to collect input voltage and input current of the power supply.

[0061] In one example, the third sampling module may include a voltage sampling module and a current sampling module, wherein the voltage sampling module may be connected to an ADC pin of a processor to provide the level of the input voltage of the power supply; the current sampling module may be connected to another ADC pin of the processor to provide the corresponding level after converting the current into a voltage signal.

[0062] In one embodiment, the circuit may further include a fourth sampling module, one end of which is connected to the load and the other end is grounded, and is used to collect the current of the load.

[0063] The embodiment of the present invention divides the circuit into a power factor correction circuit and a voltage divider circuit by setting a voltage divider circuit; the voltage divider circuit can ensure that when the load overload condition is complex, resulting in inaccurate input voltage and input current sampled by the power factor correction circuit, the actual input voltage and current can be accurately obtained from the voltage divider circuit, thereby improving the accuracy of power calculation, and multiple power calculation strategies are preset in the processor, so that the processor can flexibly select the corresponding power processing method according to the load condition. Compared with the power calculation method of the prior art, the embodiment of the present invention helps to improve the accuracy of power calculation.

[0064] In one embodiment, referring to Figure 2 , shows a schematic diagram of the structure of another circuit of an embodiment of the present invention, specifically comprising:

[0065] The sampling circuit 50 includes: resistors R1, R2, R3 and R4, a sampling point Vin_simple1, the sampling point is used to collect voltage, and the structure is specifically that the first end of R1 is connected to the first end of the first rectifier bridge DB1, the second end of R1 is connected to the first end of R2, the second end of R2 is connected to the first end of R3, the second end of R3 is connected to Vin_simple1, the first end of R4 is connected between the second end of R2 and the first end of R3, and the second end of R4 is grounded. The sampling circuit can also have other structures, which are not limited in the embodiment of the present invention.

[0066] The power factor correction circuit 20 includes a first rectifier bridge DB1, inductors L1 and L2, resistors R8, R9 and R10, switches G1 and G2, PWM modulation pulse signals PWM1 and PWM2, and a motor MOTOR. The structure is specifically that the first end of L1 is connected to the first end of DB1, the second end is connected to the first end of G1, the second end of G1 is used to receive the modulation pulse signal PWM1, the third end of G2 is connected to the first end of R8, the second end of R8 is grounded, the first end of the inductor L2 is connected to the first end of the rectifier bridge DB1, the second end of L2 is connected to the first end of the switch G2, the second end of G2 is used to receive the modulation pulse signal PWM2, the first end of R10 is connected to the third end of G2, the second end is grounded, the first end of R9 is connected to the second end of DB1, the second end of R9 is connected to the second end of MOTOR, and the first end of MOTOR is connected to the second end of the inductor L2. The power factor correction circuit can also be other structures, which are not limited in the embodiments of the present invention.

[0067] The voltage divider circuit 30 includes a rectifier bridge DB2, resistors R5, R6 and R7, and a sampling point Vin_simple2, where the sampling point is used to collect voltage, and the structure is specifically that the first end of R5 is connected to the first end of DB2, the second end of R5 is connected to the first end of R6, the second end of R6 is connected to the first end of Vin_simple2, the first end of R7 is connected between the second end of R6 and the first end of Vin_simple2, and the second end of R7 is grounded. The voltage divider circuit can also have other structures, which are not limited in the embodiment of the present invention.

[0068] In one embodiment, the processor is used to determine a target processing strategy from a plurality of preset processing strategies based on a comparison result of the load current with a preset load current value, a comparison result of the power supply voltage with a preset power supply voltage value, and a comparison result of the power supply current with a preset power supply current value.

[0069] By comparing the power supply current and the power supply voltage with the preset power supply current threshold and the power supply voltage threshold, the corresponding voltage comparison results and current comparison results are obtained, and the current of the load is compared with the preset load threshold to obtain the corresponding load current comparison result. By combining the three, the overload condition of the load at this time can be obtained. According to the overload condition of the load at this time, the microprocessor can select the power processing method corresponding to the overload condition and calculate the power to make the calculation result more accurate.

[0070] In one embodiment, the multiple preset processing strategies include a first processing strategy, wherein the first processing strategy is to select the output voltage of the first rectifier bridge as the target processing voltage; the processor is used to use the first processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

[0071] The preset processing strategies in the microprocessor are divided into different types of processing strategies according to the different rectifier bridges selected to provide the voltage participating in power processing, and the strategy of using the output voltage at the first rectifier bridge as the voltage participating in power processing is used as the first processing strategy; when the current of the load is less than the preset load current value, the power supply voltage is less than the preset power supply voltage value and the power supply current is less than the preset power supply current value, it is judged that the overload condition of the load at this time is light load. In this case, because the PFC opening is large, the power factor is high, and the load is in a light load condition, the load has little influence on the power side voltage sampling, so the sampling value of the output voltage of the first rectifier bridge is selected as the voltage value participating in power processing, that is, the value of Vin_simple1, thereby improving the power calculation efficiency.

[0072] In one embodiment, the multiple preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge; the output voltage of the first rectifier bridge after the increase is used as the target voltage; the processor is used to use the second processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

[0073] When the current of the load is less than the preset load current value, the power supply current is less than the preset power supply current value but the power supply voltage is greater than the preset power supply voltage value, the overload condition of the load is in a light load condition, but at this time, because the power supply voltage is at a high level, the PFC opening is small in this case, and the power factor is small at this time, therefore, the duty cycle of the pulse modulation signal for the power factor corrector is adjusted to increase the output voltage of the first rectifier bridge;

[0074] In the PFC circuit of the air conditioner, the Boost architecture is usually used to adjust the phase of the input current and voltage by controlling the on and off of the switch tube, so as to achieve power factor correction. Load changes will affect the output voltage and current of the Boost circuit, which in turn affects the calculation and control of power. It is essentially a boost circuit, which is mainly used to convert DC voltage into a higher DC voltage. This circuit realizes the voltage boost function by controlling the on and off time ratio of the switch tube. The working principle of the Boost architecture is based on components such as inductors, switch tubes and diodes. When the switch tube is turned on, the inductor is charged, and the current flows to the load through the switch tube and the inductor; when the switch tube is turned off, the inductor discharges and continues to supply power to the load through the diode, while charging the output capacitor. By repeating this process continuously, the output voltage is eventually higher than the input voltage.

[0075] After increasing the output voltage of the first rectifier bridge, the value of Vin_simple1 is used as the voltage value involved in power processing to perform power calculation;

[0076] In one example, increasing the PFC opening can be achieved by optimizing the control circuit, such as improving the accuracy of the zero voltage detector and adjusting the switch duty cycle. The duty ratio generally refers to the proportion of the power-on time to the total time in a pulse cycle. In the application scenario of this article, the duty bit refers to the ratio of the switch conduction time to the entire cycle time in a switching cycle.

[0077] This avoids the situation where the power calculation is inaccurate due to the influence of PFC on the power factor when the load overload condition is light but the power supply voltage is too high.

[0078] In one embodiment, the plurality of preset processing strategies further include a third processing strategy, wherein the third processing strategy is a processing strategy for selecting the output voltage of the second rectifier bridge as a target processing voltage; the processor is configured to use the third processing strategy as a target processing strategy when the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value;

[0079] When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0080] When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0081] When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0082] When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0083] When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

[0084] When the processor is used to judge that the overload condition of the load is heavy load when the current of the load is greater than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value, the sampling value of the output voltage of the second rectifier bridge is used as the voltage value participating in power processing, that is, the value of Vin_simple2, to perform power calculation, and the processing strategy of using the sampling value of the output voltage of the second rectifier bridge as the voltage value participating in power processing becomes the third processing strategy, and the situations applicable to the third processing also include: the current of the load is less than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value. Normal state of current value; low-frequency overload condition when the current of the load is greater than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is less than the preset power supply current value; overload condition when the current of the load is greater than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value; normal state when the current of the load is less than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value; low-frequency overload condition when the current of the load is greater than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is less than the preset power supply current value. Overload generally refers to when the load connected to the rear end of the air conditioner is small, the current flowing through the load is large, the power consumed is large, the conversion efficiency is relatively high at this time, and the main power consumption is on the load at the rear end. In the overload state, the conversion efficiency of the air conditioner is high, because the main power consumption is on the load at the rear end, and the power supply utilization rate is high. Light load generally refers to the situation when the connected load is large, the current flowing through the load is small, the power consumption is small, the conversion efficiency is low, and the main power consumption is at the front end. In the light load state, the conversion efficiency is low, the main power consumption is at the front end, and the power utilization rate is low.

[0085] This embodiment integrates the overload conditions that have a greater impact on the first rectifier bridge according to the overload conditions of the rear-end load, and in such conditions, uses the output voltage of the second rectifier bridge as the target voltage for power processing, thereby effectively improving the accuracy of power calculation.

[0086] The embodiment of the present invention divides the circuit into a power factor correction circuit and a voltage divider circuit by setting a voltage divider circuit; the voltage divider circuit can ensure that when the load overload condition is complex, resulting in inaccurate input voltage and input current sampled by the power factor correction circuit, the actual input voltage and current can be accurately obtained from the voltage divider circuit, thereby improving the accuracy of power calculation, and multiple power calculation strategies are preset in the processor, so that the processor can flexibly select the corresponding power processing method according to the load condition. Compared with the power calculation method of the prior art, the embodiment of the present invention helps to improve the accuracy of power calculation.

[0087] Reference Figure 3 , shows a flow chart of the steps of an embodiment of a power processing method of the present invention, which may specifically include the following steps:

[0088] Step 101, obtaining the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply;

[0089] Step 102, determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply;

[0090] Step 103, according to the target processing strategy, taking the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage;

[0091] Step 104: Determine the power of the load according to the target voltage.

[0092] By setting different processing strategies and flexibly selecting different processing strategies to calculate the power according to the load current and the voltage and current of the power supply, the calculation result can be made more accurate.

[0093] The embodiment of the present invention divides the circuit into a power factor correction circuit and a voltage divider circuit by setting a voltage divider circuit; the voltage divider circuit can ensure that when the load overload condition is complex, resulting in inaccurate input voltage and input current sampled by the power factor correction circuit, the actual input voltage and current can be accurately obtained from the voltage divider circuit, thereby improving the accuracy of power calculation, and multiple power calculation strategies are preset in the processor, so that the processor can flexibly select the corresponding power processing method according to the load condition. Compared with the power calculation method of the prior art, the embodiment of the present invention helps to improve the accuracy of power calculation.

[0094] Reference Figure 4 , shows a flow chart of another power processing method embodiment of the present invention, which may specifically include the following steps:

[0095] Step 201, obtaining the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply.

[0096] Step 202, determining a target processing strategy from a plurality of preset processing strategies according to a comparison result between the load current and a preset load current value, a comparison result between the power supply voltage and a preset power supply voltage value, and a comparison result between the power supply current and a preset power supply current value.

[0097] Step 203: according to the target processing strategy, taking the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage.

[0098] Step 204: Determine the power of the load according to the target voltage.

[0099] By comparing the power supply current and the power supply voltage with the preset power supply current threshold and the power supply voltage threshold, the corresponding voltage comparison results and current comparison results are obtained, and the current of the load is compared with the preset load threshold to obtain the corresponding load current comparison result. By combining the three, the overload condition of the load at this time can be obtained. According to the overload condition of the load at this time, the microprocessor can select the power processing method corresponding to the overload condition and calculate the power to make the calculation result more accurate.

[0100] In one embodiment, the plurality of preset processing strategies include a first processing strategy; the first processing strategy is a processing strategy for selecting the output voltage of the first rectifier bridge as a target processing voltage;

[0101] The step 202 may include the following sub-steps: when the current of the load is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, using the first processing strategy as the processing strategy.

[0102] In one embodiment, the plurality of preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge, and the output voltage of the first rectifier bridge after the increase is used as the target voltage;

[0103] The step 202 may include the following sub-steps: when the current of the load is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, using the second processing strategy as a target processing strategy.

[0104] When the current of the load is less than the preset load current value, the power supply current is less than the preset power supply current value but the power supply voltage is greater than the preset power supply voltage value, the overload condition of the load is in a light load condition, but at this time, because the power supply voltage is at a high level, the PFC opening is small in this case, and the power factor is small at this time, therefore, the duty cycle of the pulse modulation signal for the power factor corrector is adjusted to increase the output voltage of the first rectifier bridge;

[0105] In the PFC circuit of the air conditioner, the Boost architecture is usually used to adjust the phase of the input current and voltage by controlling the on and off of the switch tube, so as to achieve power factor correction. Load changes will affect the output voltage and current of the Boost circuit, which in turn affects the calculation and control of power. It is essentially a boost circuit, which is mainly used to convert DC voltage into a higher DC voltage. This circuit realizes the voltage boost function by controlling the on and off time ratio of the switch tube. The working principle of the Boost architecture is based on components such as inductors, switch tubes and diodes. When the switch tube is turned on, the inductor is charged, and the current flows to the load through the switch tube and the inductor; when the switch tube is turned off, the inductor discharges and continues to supply power to the load through the diode, while charging the output capacitor. By repeating this process continuously, the output voltage is eventually higher than the input voltage.

[0106] After increasing the output voltage of the first rectifier bridge, the value of Vin_simple1 is used as the voltage value involved in power processing to perform power calculation;

[0107] In one example, increasing the PFC opening can be achieved by optimizing the control circuit, such as improving the accuracy of the zero voltage detector and adjusting the switch duty cycle. The duty ratio generally refers to the proportion of the power-on time to the total time in a pulse cycle. In the application scenario of this article, the duty bit refers to the ratio of the switch conduction time to the entire cycle time in a switching cycle.

[0108] In one embodiment, the plurality of preset processing strategies further include a third processing strategy, wherein the third processing strategy is to select the output voltage of the second rectifier bridge as the target processing voltage;

[0109] The step 202 may include the following sub-steps: when the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, using the third processing strategy as a target processing strategy;

[0110] When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0111] When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0112] When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0113] When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy;

[0114] When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

[0115] When the processor is used to judge that the overload condition of the load is heavy load when the current of the load is greater than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value, the sampling value of the output voltage of the second rectifier bridge is used as the voltage value participating in power processing, that is, the value of Vin_simple2, to perform power calculation, and the processing strategy of using the sampling value of the output voltage of the second rectifier bridge as the voltage value participating in power processing becomes the third processing strategy, and the situations applicable to the third processing also include: the current of the load is less than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value. Normal state of current value; low-frequency overload condition when the current of the load is greater than the preset load current value, the power supply voltage is greater than the preset power supply voltage value, and the power supply current is less than the preset power supply current value; overload condition when the current of the load is greater than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value; normal state when the current of the load is less than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is greater than the preset power supply current value; low-frequency overload condition when the current of the load is greater than the preset load current value, the power supply voltage is less than the preset power supply voltage value, and the power supply current is less than the preset power supply current value. Overload generally refers to when the load connected to the rear end of the air conditioner is small, the current flowing through the load is large, the power consumed is large, the conversion efficiency is relatively high at this time, and the main power consumption is on the load at the rear end. In the overload state, the conversion efficiency of the air conditioner is high, because the main power consumption is on the load at the rear end, and the power supply utilization rate is high. Light load generally refers to the situation when the connected load is large, the current flowing through the load is small, the power consumption is small, the conversion efficiency is low, and the main power consumption is at the front end. In the light load state, the conversion efficiency is low, the main power consumption is at the front end, and the power utilization rate is low.

[0116] This embodiment integrates the overload conditions that have a greater impact on the first rectifier bridge according to the overload conditions of the rear-end load, and in such conditions, uses the output voltage of the second rectifier bridge as the target voltage for power processing, thereby effectively improving the accuracy of power calculation.

[0117] The embodiment of the present invention divides the circuit into a power factor correction circuit and a voltage divider circuit by setting a voltage divider circuit; the voltage divider circuit can ensure that when the load overload condition is complex, resulting in inaccurate input voltage and input current sampled by the power factor correction circuit, the actual input voltage and current can be accurately obtained from the voltage divider circuit, thereby improving the accuracy of power calculation, and multiple power calculation strategies are preset in the processor, so that the processor can flexibly select the corresponding power processing method according to the load condition. Compared with the power calculation method of the prior art, the embodiment of the present invention helps to improve the accuracy of power calculation.

[0118] On the other hand, an embodiment of the present invention further provides an air conditioner, comprising any one of the circuits described in the above embodiments, which will not be described again here to avoid repetition.

[0119] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0120] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0121] Those skilled in the art will appreciate that the embodiments of the present invention may be provided as methods, devices, or processor program products. Therefore, the present invention may be provided in the form of a complete hardware embodiment, a complete software embodiment, or a combination of software and hardware embodiments. Furthermore, the present invention may be provided in the form of a processor program product implemented on one or more processor-available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain processor-available program codes.

[0122] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and processor program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by processor program instructions. These processor program instructions can be provided to a processor of a general-purpose processor, a special-purpose processor, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the processor or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These processor program instructions may also be stored in a processor readable memory capable of directing a processor or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the processor readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0124] These processor program instructions may also be loaded onto a processor or other programmable data processing terminal device so that a series of operating steps are executed on the processor or other programmable terminal device to produce a processor-implemented process, thereby providing instructions for executing on the processor or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0125] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0126] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0127] The above is a detailed introduction to a circuit, a power processing method of the circuit and an air conditioner provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A circuit, characterized in that: The circuit comprises: A power factor correction circuit is connected to a power supply; the power factor correction circuit comprises a first rectifier bridge and a power factor corrector; the first rectifier bridge is used to receive the alternating current output by the power supply and convert the alternating current into direct current; A load connected to the power factor correction circuit and configured to receive the direct current output by the power factor correction circuit; A voltage divider circuit is connected in parallel with the power factor correction circuit; the voltage divider circuit includes a second rectifier bridge, which is used to receive the alternating current output by the power supply and convert the alternating current into direct current; A processor is used to obtain the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply; determine a target processing strategy from multiple preset processing strategies based on the current of the load and the power supply voltage and power supply current of the power supply; according to the target processing strategy, use the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage; and determine the power of the load based on the target voltage.

2. The circuit according to claim 1, characterized in that The processor is used to determine a target processing strategy from multiple preset processing strategies based on the comparison result between the load current and the preset load current value, the comparison result between the power supply voltage and the preset power supply voltage value, and the comparison result between the power supply current and the preset power supply current value.

3. The circuit according to claim 2, characterized in that The multiple preset processing strategies include a first processing strategy, which is to select the output voltage of the first rectifier bridge as the target processing voltage; the processor is used to use the first processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

4. The circuit according to claim 2, characterized in that The plurality of preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge; and the output voltage of the first rectifier bridge after the increase is used as the target voltage; The processor is used to use the second processing strategy as the target processing strategy when the current of the load is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

5. The circuit according to claim 2, characterized in that The plurality of preset processing strategies also include a third processing strategy, wherein the third processing strategy is a processing strategy for selecting the output voltage of the second rectifier bridge as a target processing voltage; the processor is configured to use the third processing strategy as a target processing strategy when the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value; When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

6. A power processing method for a circuit, characterized in that: Applied to the circuit according to any one of claims 1 to 5, the method comprises: Acquire the output voltage of the first rectifier bridge, the output voltage of the second rectifier bridge, the current of the load, and the power supply voltage and power supply current of the power supply; Determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply; According to the target processing strategy, the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge is used as the target voltage; The power of the load is determined according to the target voltage.

7. The method according to claim 6, characterized in that The step of determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes: According to the comparison result between the load current and the preset load current value, the comparison result between the power supply voltage and the preset power supply voltage value, and the comparison result between the power supply current and the preset power supply current value, a target processing strategy is determined from multiple preset processing strategies.

8. The method according to claim 7, characterized in that The plurality of preset processing strategies include a first processing strategy, wherein the first processing strategy is to select the output voltage of the first rectifier bridge as the target processing voltage; the target processing strategy is determined from the plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply, including: When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the first processing strategy is used as the processing strategy.

9. The method according to claim 7, characterized in that: The plurality of preset processing strategies include a second processing strategy, wherein the second processing strategy is to adjust the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge, and the output voltage of the first rectifier bridge after the increase is used as the target voltage; The step of determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes: When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the second processing strategy is used as a target processing strategy.

10. The method according to claim 7, characterized in that The plurality of preset processing strategies further include a third processing strategy, wherein the third processing strategy is to select the output voltage of the second rectifier bridge as the target processing voltage; The step of determining a target processing strategy from a plurality of preset processing strategies according to the current of the load and the power supply voltage and power supply current of the power supply includes: When the load current is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the load current is less than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the current of the load is greater than a preset load current value, the power supply voltage is greater than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the current of the load is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the load current is less than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value, the third processing strategy is used as a target processing strategy; When the load current is greater than a preset load current value, the power supply voltage is less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value, the third processing strategy is used as a target processing strategy.

11. An air conditioner, characterized in that: The invention comprises any circuit described in claims 1 to 5.

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