A circuit, a power handling method of the circuit and an air conditioner

Abstract

The embodiment of the present application 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 a plurality of preset processing strategies; according to the target processing strategy, an output voltage of the first rectifier bridge or an output voltage of the second rectifier bridge is taken as a target voltage; and by selecting the output voltage of different rectifier bridges as the target voltage according to different processing strategies, the processor can flexibly select a corresponding power processing method according to a load condition, and compared with a power calculation mode in the prior art, the embodiment of the present application is helpful to improve the accuracy of power calculation.

Description

TECHNICAL FIELD

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

[0002] At present, more and more users pay attention to the electric power consumed by the outdoor unit of the air conditioner. Generally, in the power calculation of the air conditioner circuit, three kinds of power are involved, namely, active power, reactive power and apparent power. The apparent power includes the active power and the reactive power and is obtained by multiplying the effective voltage and the effective current. In the PFC (Power Factor Correction) circuit, the commonly used power calculation method has some problems. Different overloads of the load will have different effects on the sampled voltage, thereby affecting the power calculation. In addition, the opening degree of the PFC will also cause the variation of the power factor, resulting in a large difference between the program calculated power and the actual consumed power of the outdoor unit. SUMMARY

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

[0004] In order to solve the above problems, the embodiments of the present application disclose a circuit, which comprises:

[0005] a power factor correction circuit connected with 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 alternating current output by the power supply and convert the alternating current into direct current;

[0006] a load connected with the power factor correction circuit and used to receive direct current output by the power factor correction circuit;

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

[0008] a processor used to acquire output voltage of the first rectifier bridge, output voltage of the second rectifier bridge, current of the load and 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; take the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as a target voltage according to the target processing strategy; and determine the power of the load according to the target voltage.

[0009] Optionally, the processor is configured to determine a target processing strategy from a plurality of preset processing strategies according to a comparison result of the current of the load and a preset load current value, a comparison result of the power supply voltage and a preset power supply voltage value, and a comparison result of the power supply current and a preset power supply current value.

[0010] Optionally, the plurality of preset processing strategies comprises a first processing strategy of selecting an output voltage of the first rectifier bridge as a target processing voltage; and the processor is configured to determine the first processing strategy as the target 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.

[0011] Optionally, the plurality of preset processing strategies comprises a second processing strategy of adjusting a duty cycle of a pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge; and the processor is configured to determine the second processing strategy as the target processing strategy when 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 less than the preset power supply current value.

[0012] Optionally, the plurality of preset processing strategies further comprises a third processing strategy of selecting an output voltage of the second rectifier bridge as a target processing voltage; and the processor is configured to determine the third processing strategy as the target processing strategy 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.

[0013] determine the third processing strategy as the target processing strategy when 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.

[0014] determine the third processing strategy as the target processing strategy 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.

[0015] determine the third processing strategy as the target processing strategy 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.

[0016] determine the third processing strategy as the target 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 greater than the preset power supply current value.

[0017] 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 less than a preset power supply current value, the third processing strategy is taken as the target processing strategy.

[0018] In another aspect, an embodiment of the present application provides a power processing method of a circuit, the method comprising:

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

[0021] taking the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as a target voltage according to the target processing strategy;

[0022] determining the power of the load according to the target voltage.

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

[0024] determining the target processing strategy from the plurality of preset processing strategies according to a comparison result of the current of the load and a preset load current value, a comparison result of the power supply voltage and a preset power supply voltage value, and a comparison result of the power supply current and a preset power supply current value.

[0025] Optionally, the plurality of preset processing strategies comprises a first processing strategy, the first processing strategy being to select the output voltage of the first rectifier bridge as a target processing voltage; and the determining of the target processing strategy from the plurality of preset processing strategies according to the current of the load and the power supply voltage and the power supply current of the power supply comprises:

[0026] 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, the first processing strategy is taken as the processing strategy.

[0027] Optionally, the plurality of preset processing strategies comprises a second processing strategy, the second processing strategy being to adjust a duty cycle of a 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 being taken as the target voltage.

[0028] The target processing strategy is determined from a plurality of preset processing strategies according to the current of the load and the power supply voltage and the power supply current of the power supply, and the target processing strategy comprises:

[0029] 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, the second processing strategy is taken as the target processing strategy.

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

[0031] The target processing strategy is determined from a plurality of preset processing strategies according to the current of the load and the power supply voltage and the power supply current of the power supply, and the target processing strategy comprises:

[0032] 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, the third processing strategy is taken as the target processing strategy.

[0033] 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 greater than a preset power supply current value, the third processing strategy is taken as the 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 taken as the 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 taken as the target processing strategy.

[0036] 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 greater than a preset power supply current value, the third processing strategy is taken as the target processing strategy.

[0037] 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 less than a preset power supply current value, the third processing strategy is taken as the target processing strategy.

[0038] In another aspect, the embodiment of the present application also provides an air conditioner comprising any one of the circuits described in the above embodiments.

[0039] The embodiment of the present application sets the power factor correction circuit and the voltage dividing circuit by setting the voltage dividing circuit, and the voltage dividing circuit can ensure that the actual input voltage and current can be accurately obtained from the voltage dividing circuit when the input voltage and input current sampled by the power factor correction circuit are inaccurate due to the overload of the load, thereby improving the accuracy of power calculation, and the processor is preset with various power calculation strategies, 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 application is helpful to improve the accuracy of power calculation. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of a circuit of the embodiment of the present application;

[0041] Figure 2 is a structural schematic diagram of another circuit of the embodiment of the present application;

[0042] Figure 3 is a step flow chart of a power calculation method of a circuit of the embodiment of the present application;

[0043] Figure 4 is a step flow chart of a power calculation method of another circuit of the embodiment of the present application. DETAILED DESCRIPTION

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

[0045] One of the core ideas of the embodiment of the present application is that,

[0046] By setting the voltage dividing circuit to divide the working circuit into the isolation side and the power side, the influence of the overload of the load in the circuit on the sampled voltage in the traditional technology is reduced, and combined with various preset processing strategies, the power side sampling data or the isolation side sampling data is flexibly selected, so that the calculation result of the power is more accurate.

[0047] Reference Figure 1 , a structural schematic diagram of a circuit of the embodiment of the present application is shown, which can specifically include:

[0048] The power factor correction circuit 20 is connected with 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] The rectifier bridge is a circuit element for converting alternating current into direct current by using the conduction and cutoff characteristics of diodes, and is generally composed of several diodes. The power factor correction circuit module is a circuit module including a power factor corrector. The power factor corrector (PFC) is mainly used to control the waveform of input current to be synchronized with the waveform of input voltage, improve the power factor, and reduce the harmonic content, and can solve the problems of electromagnetic interference (EMI) and electromagnetic compatibility (EMC) caused by the serious distortion of current waveform due to capacitive load. The power factor refers to the relationship between the effective power and the apparent power, and is used to measure the degree of effective use of electric power. The greater the power factor value, the higher the utilization rate of electric power in the circuit.

[0050] The load 40 is connected to the power factor correction circuit 20 and is used to receive the direct current output by the power factor correction circuit 20.

[0051] The load 40 can be a circuit including circuit operation service elements, such as a compressor and the like.

[0052] The voltage dividing circuit 30 is connected in parallel to the power factor correction circuit. The voltage dividing circuit 30 includes a second rectifier bridge (not shown in the figure) for receiving the alternating current output by the power supply 10 and converting the alternating current into direct current. The voltage dividing circuit 30 is connected in parallel to the power factor correction circuit 20, receives the alternating current output by the power supply through the second rectifier bridge, and converts the alternating current into direct current.

[0053] The voltage dividing circuit 30 can ensure accurate acquisition of the input voltage of the circuit when the load changes or the grid voltage fluctuates.

[0054] The processor (not shown in the figure) is used to 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. According to the current of the load and the power supply voltage and power supply current of the power supply, a target processing strategy is determined from a plurality of preset processing strategies. According to the target processing strategy, the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge is taken as a target voltage. According to the target voltage, the power of the load is determined.

[0055] The processor is a processing module comprising a microcontroller (MCU, Microcontroller Unit), the microprocessor is responsible for executing the main logic control instruction of the electric appliance, processing the input signal of the user, and managing the communication with other modules; by storing a plurality of preset processing strategies in the micro manager in the air conditioner circuit, the power processing mode can be more close to the actual situation, and the calculation result is more accurate.

[0056] In an embodiment, the power factor correction circuit can further comprise a first sampling module connected to one end of the first rectifier bridge and grounded at the other end, for collecting the output voltage of the first rectifier bridge.

[0057] In an example, the first sampling module can be connected to an ADC (Analog-to-Digital Converter) pin of the processor, for providing the level of the output voltage of the first rectifier bridge. The structure and connection mode of the sampling module are not limited in the application.

[0058] In an embodiment, the voltage dividing circuit can further comprise a second sampling module connected to one end of the second rectifier bridge and grounded at the other end, for collecting the output voltage of the second rectifier bridge.

[0059] In an example, the second sampling module can be connected to another ADC pin of the processor, for providing the level of the output voltage of the second rectifier bridge. The structure and connection mode of the sampling module are not limited in the application.

[0060] In an embodiment, the circuit further comprises a third sampling module connected in parallel with the power supply, for collecting the input voltage and input current of the power supply.

[0061] In an example, the third sampling module can comprise a voltage sampling module and a current sampling module, wherein the voltage sampling module can be connected to an ADC pin of the processor, for providing the level of the input voltage of the power supply; the current sampling module can be connected to another ADC pin of the processor, for converting the current into a voltage signal and then providing the corresponding level.

[0062] In an embodiment, the circuit can further comprise a fourth sampling module connected to one end of the load and grounded at the other end, for collecting the current of the load.

[0063] The embodiment of the present application sets the power factor correction circuit and the voltage dividing circuit by setting the voltage dividing circuit, and the voltage dividing circuit can accurately obtain the actual input voltage and current when the input voltage and input current sampled by the power factor correction circuit are inaccurate due to the overload of the load, thereby improving the accuracy of power calculation. The processor is preset with various power calculation strategies, 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 application is helpful to improve the accuracy of power calculation.

[0064] In one embodiment, referring to Figure 2 , another embodiment of the circuit structure of the present application is shown, which specifically includes:

[0065] The sampling circuit 50 includes resistors R1, R2, R3 and R4, a sampling point Vin_simple1, and a sampling point for collecting voltage. 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 be other structures, which are not limited in the embodiment of the present application.

[0066] The power factor correction circuit 20 includes the 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 for receiving 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 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 switch G2, the second end of G2 is used for receiving 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 inductor L2. The power factor correction circuit can also be other structures, which are not limited in the embodiment of the present application.

[0067] The voltage dividing circuit 30 includes a rectifier bridge DB2, resistors R5, R6 and R7, and a sampling point Vin_simple2 for collecting voltage, and is specifically configured as follows: a first end of the resistor R5 is connected to a first end of the rectifier bridge DB2, a second end of the resistor R5 is connected to a first end of the resistor R6, a second end of the resistor R6 is connected to a first end of the sampling point Vin_simple2, a first end of the resistor R7 is connected between the second end of the resistor R6 and the first end of the sampling point Vin_simple2, and a second end of the resistor R7 is grounded. The voltage dividing circuit can also have other structures, and the embodiments of the present application do not limit this.

[0068] In an embodiment, the processor is configured to determine a target processing strategy from a plurality of preset processing strategies according to a comparison result of the current of the load 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 preset power supply current and power supply voltage thresholds to obtain corresponding voltage comparison results and current comparison results, and comparing the current of the load with a preset load threshold to obtain a corresponding load current comparison result, the overload condition of the load at this time can be obtained by combining the three, and the microprocessor can select a power processing mode corresponding to the overload condition according to the overload condition of the load at this time, so that the calculation result is more accurate.

[0070] In an embodiment, the plurality of preset processing strategies include a first processing strategy, and the first processing strategy is to select the output voltage of the first rectifier bridge as a target processing voltage; and the processor is configured to select the first processing strategy as the target 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.

[0071] The preset processing strategies in the microprocessor are divided into different types of processing strategies according to different rectifier bridges providing the voltage participating in power processing, and the strategy of selecting the output voltage of the first rectifier bridge as the voltage participating in power processing is selected 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 which case, because the PFC opening degree is large, the power factor is high, and the overload condition of the load is in light load, the influence of the load on the power side voltage sampling is small, 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 an embodiment, the plurality of preset processing strategies includes a second processing strategy, the second processing strategy is to adjust a duty cycle of a pulse modulation signal for the power factor corrector to increase an output voltage of the first rectifier bridge; the output voltage of the first rectifier bridge after being increased is taken as a target voltage; the processor is configured to take the second processing strategy as a 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 a preset load current value, the power supply current is less than a preset power supply current value, but the power supply voltage is greater than a preset power supply voltage value, the overload condition of the load is light load, but at this time, the power supply voltage is at a high level, so that the PFC opening degree 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 an air conditioner PFC circuit, a Boost architecture is usually used to adjust the phase of input current and voltage by controlling the on-off of the switch tube, so as to realize power factor correction. Load variation will affect the output voltage and current of the Boost circuit, and then affect the calculation and control of power. Its essence is a kind of boost circuit, mainly used for converting DC voltage into higher DC voltage. This circuit realizes the function of voltage boosting by controlling the on-off time ratio of the switch tube. The working principle of Boost architecture is based on inductance, switch tube and diode. When the switch tube is turned on, the inductor is charged, and the current flows through the switch tube and the inductor to the load; when the switch tube is turned off, the inductor is discharged, and the diode continues to supply power to the load, while charging the output capacitor. By continuously repeating this process, the output voltage is finally 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 participating in power processing for power calculation;

[0076] In an example, increasing the PFC opening degree can be realized by optimizing the control circuit, such as improving the accuracy of the zero voltage detector and adjusting the switching duty ratio. Duty ratio generally refers to the proportion of on time to total time in a pulse cycle. In the application scenario of this article, duty ratio refers to the ratio of switch-on time to whole cycle time in a switching period.

[0077] In this way, the inaccurate power calculation caused by the influence of PFC on power factor when the overload condition of the load is light load but the power supply voltage is too high is avoided.

[0078] In an embodiment, the plurality of preset processing strategies further comprises a third processing strategy, the third processing strategy being a processing strategy of selecting an output voltage of the second rectifier bridge as a target processing voltage; the processor is configured to select 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;

[0079] select the third 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 greater than a preset power supply current value;

[0080] select 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 less than a preset power supply current value;

[0081] select 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 less than a preset power supply voltage value, and the power supply current is greater than a preset power supply current value;

[0082] select the third 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 greater than a preset power supply current value;

[0083] select 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 less than a preset power supply voltage value, and the power supply current is less than a preset power supply current value.

[0084] When the processor is used to judge the overload condition of the load as 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 the power processing, that is, the value of Vin_simple2, power calculation is carried out, and the processing strategy of using the sampling value of the output voltage of the second rectifier bridge as the voltage value participating in the power processing becomes the third processing strategy, and the third processing condition also includes: the normal state that 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; the low-frequency heavy load condition that 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; the heavy load condition that 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; the normal state that 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; and the low-frequency heavy load condition that 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. The heavy load generally refers to the case that 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 heavy load 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 utilization rate of the power supply is high. The light load generally refers to the case that 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 on the front end. In the light load state, the conversion efficiency is low, the main power consumption is on the front end, and the utilization rate of the power supply is low.

[0085] In the embodiment, according to the overload condition of the load at the rear end, the overload conditions that greatly affect the first rectifier bridge are integrated, and in such conditions, the output voltage of the second rectifier bridge is used as the target voltage participating in the power processing, thereby effectively improving the accuracy of power calculation.

[0086] In the embodiment, the circuit is divided into a power factor correction circuit and a voltage dividing circuit by setting the voltage dividing circuit, the voltage dividing circuit can accurately obtain the actual input voltage and current when the overload condition of the load is complex and the input voltage and input current sampled by the power factor correction circuit are inaccurate, 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 in the prior art, the embodiment is helpful to improve the accuracy of power calculation.

[0087] Referring to Figure 3 , a step flow chart of an embodiment of a power processing method of the present application is shown, which can 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, taking the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as a target voltage according to the target processing strategy.

[0091] Step 104, determining the power of the load according to the target voltage.

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

[0093] The embodiment of the present application sets a power factor correction circuit and a voltage dividing circuit by setting a voltage dividing circuit, which can ensure that the actual input voltage and current can be accurately obtained from the voltage dividing circuit when the input voltage and input current sampled by the power factor correction circuit are inaccurate due to the complexity of the overload of the load, improving the accuracy of power calculation, and a plurality of 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 application is helpful to improve the accuracy of power calculation.

[0094] Referring to Figure 4 , a step flow chart of another embodiment of a power processing method of the present application is shown, which can 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 the comparison result of the current of the load and the preset load current value, the comparison result of the power supply voltage and the preset power supply voltage value, and the comparison result of the power supply current and the 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, according to the target voltage, determining the power of the load.

[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 result and the current comparison result are obtained, the current of the load is compared with the preset load threshold, the corresponding load current comparison result is obtained, and the overload condition of the load at this time can be obtained by combining the three. According to the overload condition of the load at this time, the microprocessor can select the power processing mode corresponding to the overload condition, and calculate the power, so that the calculation result is more accurate.

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

[0101] The step 202 can include the following sub-steps: 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, the first processing strategy is selected as the processing strategy.

[0102] In one embodiment, the plurality of preset processing strategies includes a second processing strategy, and the second processing strategy is a processing strategy for adjusting 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 taken as the target voltage.

[0103] The step 202 can include the following sub-steps: when 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 less than the preset power supply current value, the second processing strategy is selected as the 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 light load, but at this time, the PFC opening degree is small in this case because the power supply voltage is at a high level, and the power factor at this time is small. 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 an air conditioner PFC circuit, a Boost architecture is usually used to adjust the phase of input current and voltage by controlling the on-off of the switch tube, so as to realize power factor correction. Load changes will affect the output voltage and current of the Boost circuit, and then affect the calculation and control of power. Its essence is a kind of boost circuit, mainly used for converting DC voltage into higher DC voltage. This circuit realizes the function of voltage boosting by controlling the on-off time ratio of the switch tube. The working principle of Boost architecture is based on inductance, switch tube and diode. When the switch tube is turned on, the inductor is charged, and the current flows through the switch tube and the inductor to the load; when the switch tube is turned off, the inductor is discharged, and the diode continues to supply power to the load, while charging the output capacitor. By continuously repeating this process, the output voltage is finally higher than the input voltage

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

[0107] In an example, increasing the PFC opening degree can be realized by optimizing the control circuit, such as improving the accuracy of the zero voltage detector and adjusting the switch duty ratio. The duty ratio generally refers to the proportion of the on time to the total time in one pulse cycle. In the application scenario of the present application, the duty ratio refers to the ratio of the on time of the switch to the whole cycle time in one switching cycle.

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

[0109] The step 202 can 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, the third processing strategy is selected as the target processing strategy.

[0110] 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 greater than a preset power supply current value, the third processing strategy is selected as the 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 selected as the 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 selected as the target processing strategy.

[0113] 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 third processing strategy is taken as the target processing strategy.

[0114] 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 third processing strategy is taken as the target processing strategy.

[0115] 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 third processing strategy is taken as the target processing strategy.

[0116] In this embodiment, according to the overload condition of the rear-end load, the overload conditions that greatly affect the first rectifier bridge are integrated, and in such conditions, the output voltage of the second rectifier bridge is used as the target voltage participating in power processing, thereby effectively improving the accuracy of power calculation.

[0117] The embodiment of the present application sets the power factor correction circuit and the voltage dividing circuit by setting the voltage dividing circuit, and the voltage dividing circuit can ensure that the actual input voltage and current can be accurately obtained from the voltage dividing circuit when the sampled input voltage and input current of the power factor correction circuit are inaccurate due to the overload of the load, and the accuracy of power calculation is improved, and a plurality of 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 application is helpful to improve the accuracy of power calculation.

[0118] In another aspect, the embodiment of the present application also provides an air conditioner comprising any one of the circuits described in the above embodiments, and details are not repeated here to avoid repetition.

[0119] It should be noted that, for the method embodiments, in order to simply describe, they are all described as a series of action combinations, but those skilled in the art should know that the embodiment of the present application is not limited to the order of the actions described, because according to the embodiment of the present application, some steps can be performed in other order or at the same time. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions involved are not necessarily required by the embodiment of the present application.

[0120] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0121] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device or processor program product. Therefore, the embodiment of the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiment of the present application can be in the form of a processor program product implemented on one or more processor usable storage media (including but not limited to disk memory, CD-ROM, optical storage, etc.) containing processor usable program code.

[0122] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams according to the method, terminal device (system) and processor program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of the flows and / or blocks in the flowchart and / or block diagram can be realized by processor program instructions. These processor program instructions can be provided to the processor of a general processor, special processor, embedded processor or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor or other programmable data processing terminal device produce a machine for realizing the functions described in the flowcharts and / or block diagrams.Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0123] These processor program instructions can also be stored in a processor-readable memory which can direct the processor or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instructions which implement the flowchart Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0124] These processor program instructions can also be loaded onto a processor or other programmable data processing apparatus to cause a series of operational steps to be performed on the processor or other programmable apparatus to produce a processor implemented process such that the instructions which execute on the processor or other programmable apparatus provide steps for implementing the flowchart Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0125] While preferred embodiments of the application have been described, those skilled in the art will recognize that additional modifications and changes can be made thereto without departing from the scope of the present application. Accordingly, the appended claims are intended to cover all such modifications and changes as fall within the scope of the application.

[0126] Finally, it should be noted that the terms "comprises", "comprising", or other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "comprising", "comprises", "including", "includes", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0127] The above describes in detail the circuit, the power processing method of the circuit and the air conditioner provided by the present application. The principles and implementation manners of the present application are described by using specific examples. The above examples are only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A circuit, characterized in that, The circuit includes: A power factor correction circuit is connected to a power supply; the power factor correction circuit includes a first rectifier bridge and a power factor corrector; the first rectifier bridge is used to receive the AC power output from the power supply and convert the AC power into DC power; A load, connected to the power factor correction circuit, is used to receive the DC power output from 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 for receiving the AC power output from the power supply and converting the AC power into DC power. The processor is configured to 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 current of the power source; determine a target processing strategy from a variety of preset processing strategies based on the current of the load and the power supply voltage and current of the power source; take the output voltage of the first rectifier bridge or the output voltage of the second rectifier bridge as the target voltage according to the target processing strategy; 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 configured to determine a target processing strategy from a variety of preset processing strategies based on the comparison results of the load current with a preset load current value, the power supply voltage with a preset power supply voltage value, and the power supply current with a 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 selects 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 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.

4. The circuit according to claim 2, characterized in that, The multiple preset processing strategies include a second processing strategy, which involves adjusting the duty cycle of the pulse modulation signal for the power factor corrector to increase the output voltage of the first rectifier bridge; the increased output voltage of the first rectifier bridge is then used as the target voltage. The processor is configured to use the second processing strategy as the 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 less than a preset power supply current value.

5. The circuit according to claim 2, characterized in that, The multiple preset processing strategies also include a third processing strategy, which is to select 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 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. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy.

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

7. The method according to claim 6, characterized in that, The step of determining a target processing strategy from multiple preset processing strategies based on the load current and the power supply voltage and current includes: Based on the comparison results of the load current with the preset load current value, the power supply voltage with the preset power supply voltage value, and the power supply current with the preset power supply current value, the target processing strategy is determined from a variety of preset processing strategies.

8. The method according to claim 7, characterized in that, The multiple preset processing strategies include a first processing strategy, which selects the output voltage of the first rectifier bridge as the target processing voltage; the step of determining the target processing strategy from the multiple preset processing strategies based on the load current and the power supply voltage and current includes: When the load current 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, the first processing strategy is used as the processing strategy.

9. The method according to claim 7, characterized in that, The multiple preset processing strategies include a second processing strategy, which 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 use the increased output voltage of the first rectifier bridge as the target voltage. The step of determining a target processing strategy from multiple preset processing strategies based on the load current and the power supply voltage and current includes: When the load current 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 less than the preset power supply current value, the second processing strategy is used as the target processing strategy.

10. The method according to claim 7, characterized in that, The multiple preset processing strategies also include a third processing strategy, which 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 multiple preset processing strategies based on the load current and the power supply voltage and current includes: When the load current 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 third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy. When the load current 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, the third processing strategy is taken as the target processing strategy.

11. An air conditioner, characterized in that, Includes the circuit described in any one of claims 1-5.

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