Method, device and storage medium for determining phase angle of input voltage without electrolytic capacitor

Abstract

The present disclosure relates to a method, device and storage medium for determining phase angle of input voltage without electrolytic capacitor. The method for determining phase angle of input voltage without electrolytic capacitor comprises: obtaining target input voltage without electrolytic capacitor; inputting the target input voltage into a pre-determined phase angle determination system, the input of the phase angle determination system being input voltage, and the output being phase angle of input voltage; and determining phase angle of the target input voltage based on the output of the phase angle determination system. The present disclosure pre-determines the phase angle determination system, which obtains input voltage without electrolytic capacitor and outputs phase angle of input voltage, thereby facilitating the determination of phase angle of input voltage.

Description

Technical Field

[0001] This disclosure relates to the field of control technology in the field of electrolytic capacitor-free inverter drive for air conditioners, and in particular to a method, apparatus and storage medium for determining the phase angle of an electrolytic capacitor-free input voltage. Background Technology

[0002] With the continuous advancement of technology, air conditioners are becoming increasingly common, and their control is becoming more and more sophisticated. Among these advancements, the control of input and output voltages for air conditioners based on electrolytic capacitor-free inverter drive technology is a particularly important area of ​​research.

[0003] In related technologies, the phase angle of the voltage is calculated by detecting the air conditioner power supply voltage, transforming it, and finally using trigonometric functions. However, this method of obtaining the voltage phase angle is difficult to quickly calculate in the process of solving the problem of electrolytic capacitor-less inverter drive. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a method for determining the phase angle of an electrolytic capacitor-free input voltage.

[0005] According to a first aspect of the present disclosure, a method for determining the phase angle of an input voltage without an electrolytic capacitor is provided, comprising: acquiring a target input voltage without an electrolytic capacitor; inputting the target input voltage to a predetermined phase angle determination system, wherein the input of the phase angle determination system is the input voltage and the output is the phase angle of the input voltage; and determining the phase angle of the target input voltage based on the output of the phase angle determination system.

[0006] In one embodiment, the phase angle determination system is predetermined as follows: a test input voltage is determined, the test input voltage having a first phase angle; a second phase angle is determined, and the second phase angle is used as the output phase angle of the phase angle determination system; a function operation is performed on the first phase angle and the second phase angle, and the result is input to the phase angle determination system, the phase angle determination system including a low-pass filter and a proportional-integral controller; the signal obtained after the function operation is low-pass filtered by the low-pass filter, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal; the phase difference is proportionally and integrally controlled by the proportional-integral controller to obtain a third phase angle; the third phase angle is used as the second phase angle, and the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system having the target low-pass filter coefficients and the target proportional-integral control parameters is obtained.

[0007] In another embodiment, performing a function operation on the first phase angle and the second phase angle includes: determining a sine function corresponding to the test input voltage having the first phase angle, and determining a cosine function for the second phase angle; and multiplying the sine function and the cosine function.

[0008] In another embodiment, obtaining the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal includes: performing a trigonometric function transformation process of product sum and difference on the low-pass filtered signal; and multiplying the trigonometric function of product sum and difference with the error function to obtain the phase difference between the first phase angle and the second phase angle.

[0009] In another embodiment, adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold includes: adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller to obtain target low-pass filter coefficients and target proportional-integral control parameters when the third phase angle is approximately equal to the second phase angle.

[0010] According to a second aspect of the present disclosure, an apparatus for determining the phase angle of an input voltage without an electrolytic capacitor is provided. The apparatus includes: an acquisition unit for acquiring a target input voltage without an electrolytic capacitor; a processing unit for inputting the target input voltage to a predetermined phase angle determination system, wherein the input of the phase angle determination system is the input voltage and the output is the phase angle of the input voltage; and a determination unit for determining the phase angle of the target input voltage based on the output of the phase angle determination system.

[0011] In one embodiment, the phase angle determination system is predetermined as follows: a test input voltage is determined, the test input voltage having a first phase angle; a second phase angle is determined, and the second phase angle is used as the output phase angle of the phase angle determination system; a function operation is performed on the first phase angle and the second phase angle, and the result is input to the phase angle determination system, the phase angle determination system including a low-pass filter and a proportional-integral controller; the signal obtained after the function operation is low-pass filtered by the low-pass filter, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal; the phase difference is proportionally and integrally controlled by the proportional-integral controller to obtain a third phase angle; the third phase angle is used as the second phase angle, and the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system having the target low-pass filter coefficients and the target proportional-integral control parameters is obtained.

[0012] In another embodiment, the processing unit performs function operations on the first phase angle and the second phase angle in the following manner: determining the sine function corresponding to the test input voltage with the first phase angle, and determining the cosine function of the second phase angle; and performing product processing on the sine function and the cosine function.

[0013] In another embodiment, the processing unit obtains the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal as follows: the low-pass filtered signal is subjected to a trigonometric function transformation of product sum and difference; the trigonometric function of product sum and difference is multiplied with the error function to obtain the phase difference between the first phase angle and the second phase angle.

[0014] In another embodiment, the processing unit adjusts the coefficients of the low-pass filter and the control parameters of the proportional-integral controller in the following manner to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold: by adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller, the target low-pass filter coefficients and target proportional-integral control parameters are obtained when the third phase angle is approximately equal to the second phase angle.

[0015] According to a third aspect of the present disclosure, an apparatus for determining the phase angle of an input voltage without an electrolytic capacitor is provided, characterized in that it includes: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: perform the method for determining the phase angle of an input voltage without an electrolytic capacitor as described in the first aspect or any embodiment of the first aspect.

[0016] According to a fourth aspect of the present disclosure, a storage medium is provided, characterized in that the storage medium stores instructions that, when executed by a processor of a terminal, enable the terminal including the processor to perform the method for determining the phase angle of the electrolytic capacitor-free input voltage in the first aspect or any embodiment of the first aspect.

[0017] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: a phase angle determination system is pre-determined, which acquires the input voltage without an electrolytic capacitor and outputs the phase angle of the input voltage. This enables rapid acquisition of the phase angle of the input voltage and improves the accuracy of acquiring the input voltage phase angle.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] Figure 1 This is a flowchart illustrating a method for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment.

[0021] Figure 2 This is a flowchart illustrating a method for a pre-determined phase angle determination system according to an exemplary embodiment.

[0022] Figure 3 This is a flowchart illustrating a method for performing a function operation on a first phase angle and a second phase angle according to an exemplary embodiment.

[0023] Figure 4 This is a flowchart illustrating a method for obtaining the phase difference between a first phase angle and a second phase angle based on a low-pass filtered signal, according to an exemplary embodiment.

[0024] Figure 5 This is a flowchart illustrating a method for adjusting the coefficients of a low-pass filter and the control parameters of a proportional-integral controller, according to an exemplary embodiment, to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold.

[0025] Figure 6 This is a schematic diagram illustrating an exemplary embodiment of a method for determining the phase angle of an electrolytic capacitor-free input voltage.

[0026] Figure 7 This is a block diagram illustrating an apparatus for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment.

[0027] Figure 8 This is a block diagram illustrating an apparatus 200 for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure.

[0029] In the prior art, in order to enable the terminal to reach high power, the output torque of the electrolytic capacitor-free driven motor needs to be in phase with the input voltage. In order to obtain the phase of the input voltage, the power supply voltage is first detected, then coordinate transformation is performed, and finally the phase angle of the voltage is calculated using trigonometric functions.

[0030] This disclosure provides a method for determining the phase angle of an input voltage without an electrolytic capacitor, which accurately obtains the input voltage phase angle through a power point tracking algorithm for a capacitorless frequency converter drive scheme.

[0031] Figure 1 This is a flowchart illustrating a method for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment, such as... Figure 1 As shown, the method for determining the phase angle of the input voltage without an electrolytic capacitor includes the following steps.

[0032] In step S11, the target input voltage without electrolytic capacitors is obtained.

[0033] In this embodiment of the disclosure, the input voltage can be the discharge pressure or the condensing pressure, typically referring to the pressure of the refrigerant gas in the discharge pipe at the compressor outlet. The input voltage can be measured using a high-voltage meter.

[0034] In step S12, the target input voltage is input to a predetermined phase angle determination system. The input of the phase angle determination system is the input voltage, and the output is the phase angle of the input voltage.

[0035] In step S13, the output of the system is determined based on the phase angle, and the phase angle of the target input voltage is determined.

[0036] In this embodiment of the disclosure, the input of the phase angle determination system is the input voltage, and the output is the phase angle of the input voltage. The phase angle determination system acquires the input voltage and, through calculation by the phase angle determination system, obtains the phase angle of the input voltage.

[0037] The method for determining the phase angle of an input voltage without an electrolytic capacitor provided in this disclosure pre-determines a phase angle determination system. This system acquires the input voltage without an electrolytic capacitor and outputs the phase angle of the input voltage. It can quickly calculate the input voltage phase angle, achieving rapid and convenient acquisition of the input voltage phase angle, improving the system's power factor, and minimizing error.

[0038] The following embodiments further explain and illustrate the method for determining the pre-determined phase angle in the above embodiments of this disclosure.

[0039] Figure 2 This is a flowchart illustrating a method for pre-determining a phase angle determination system according to an exemplary embodiment, such as... Figure 2 As shown, the method for pre-determining the phase angle determination system includes the following steps.

[0040] In step S21, the test input voltage is determined, and the test input voltage has a first phase angle.

[0041] In this embodiment of the present disclosure, an input voltage with a known phase angle can be selected as the test input voltage, and the phase angle of the test input voltage is the first phase angle.

[0042] In step S22, a second phase angle is determined, and the second phase angle is used as the phase angle to determine the output phase angle of the system.

[0043] In this embodiment of the disclosure, there will be a certain deviation between the input phase angle and the output phase angle. The output phase angle of the test input voltage is determined and used as the second phase angle.

[0044] In step S23, the first phase angle and the second phase angle are processed by a function and then input to the phase angle determination system, which includes a low-pass filter and a proportional-integral controller.

[0045] In this embodiment of the disclosure, the function operation on the first phase angle and the second phase angle can be the multiplication of the input voltage with the cosine function of the second phase angle, for example, V in *cosθ ge The input voltage can be expressed as V. in The cosine function of the second phase angle can be expressed as cosθ. ge The result of the function operation is input into the phase angle determination system for error correction.

[0046] In step S24, the signal obtained after function operation is low-pass filtered, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal.

[0047] In this embodiment, the low-pass filter is an electronic filtering device that allows signals below the cutoff frequency to pass through, but blocks signals above the cutoff frequency. It can be used to remove errors from the signal after function calculation and filter out signals above the cutoff frequency. That is, by removing errors from the signal after function calculation, the phase difference between the first phase angle and the second phase angle can be obtained.

[0048] In step S25, the phase difference is controlled by a proportional-integral controller to obtain the third phase angle.

[0049] In this embodiment of the disclosure, the phase difference is further controlled by a proportional-integral controller to perform hysteresis correction on the phase difference between the first phase angle and the second phase angle. This makes the first phase angle as equal as possible to the second phase angle, and the resulting angle is used as the third phase angle.

[0050] In step S26, the third phase angle is used as the second phase angle, and the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system with the target low-pass filter coefficients and target proportional-integral control parameters is obtained.

[0051] In this embodiment of the disclosure, for example, the third phase angle is set to be equal to the second phase angle, and the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted. These include low-pass filter parameters, proportional control parameters, and integral control parameters. The low-pass filter parameters, proportional control parameters, and integral control parameters are adjusted so that the third phase angle is equal to the second phase angle. At this point, the phase angle determination system including these low-pass filter parameters, proportional control parameters, and integral control parameters is the phase angle determination system.

[0052] The following embodiments further explain and illustrate the method for performing function operations on the first phase angle and the second phase angle in the above embodiments of this disclosure.

[0053] Figure 3 This is a flowchart illustrating a method for performing a function operation on a first phase angle and a second phase angle according to an exemplary embodiment, such as... Figure 3 As shown, the method for performing function calculations on the first phase angle and the second phase angle includes the following steps.

[0054] In step S31, the sine function corresponding to the test input voltage with the first phase angle is determined, and the cosine function of the second phase angle is determined.

[0055] In this embodiment of the disclosure, the first phase angle can be θ1, and the test input voltage for the first phase angle is V. in The sine function corresponding to the test input voltage at the first phase angle is sinV. in The second phase angle can be θ2, and the cosine function of the second phase angle is cosθ2.

[0056] In step S32, the sine function and the cosine function are multiplied.

[0057] In this embodiment of the disclosure, the sine function corresponding to the test input voltage of the first phase angle is sinV. in The cosine function of the second phase angle is cosθ². Multiplying the sine and cosine functions yields sinV. in *cosθ2.

[0058] The following embodiments of this disclosure further explain and illustrate the method for obtaining the phase difference between a first phase angle and a second phase angle based on a low-pass filtered signal as described in the above embodiments of this disclosure.

[0059] Figure 4 This is a flowchart illustrating a method for obtaining the phase difference between a first phase angle and a second phase angle based on a low-pass filtered signal, according to an exemplary embodiment. Figure 4 As shown, the method for obtaining the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal includes the following steps.

[0060] In step S41, the low-pass filtered signal is subjected to trigonometric function transformation of product and difference.

[0061] In this embodiment of the disclosure, the product-to-sum formula is a set of identities in the trigonometric functions of elementary mathematics. The product-to-sum formula converts the product of two trigonometric function values ​​into a constant multiple of the sum of two other trigonometric function values.

[0062] In this embodiment of the disclosure, for example, the sine function and the cosine function are multiplied to obtain sinV. in Using *cosθ², performing a product-to-sum transformation, we can obtain the product of the sine and cosine functions, which equals sinV. in *cosθ2=1 / 2*[sin(V in +θ2)+sin(V in -θ2)).

[0063] In step S42, the trigonometric function that has undergone trigonometric function transformation for product-to-sum and difference is multiplied with the error function to obtain the phase difference between the first phase angle and the second phase angle.

[0064] In this embodiment of the disclosure, the error function includes proportional control parameters and integral control parameters, for example, it can be... Where K P K is the proportional control parameter. I These are integral control parameters.

[0065] The following embodiments of this disclosure further explain and illustrate the method for adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller in the above embodiments of this disclosure to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold.

[0066] Figure 5 This is a flowchart illustrating a method for adjusting the coefficients of a low-pass filter and the control parameters of a proportional-integral controller, according to an exemplary embodiment, to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold. Figure 5 As shown, the method for adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold includes the following steps.

[0067] In step S51, the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted.

[0068] In this embodiment, the low-pass filter has the function of passing low frequencies and blocking high frequencies. The characteristics of the low-pass filter allow signals with frequencies below a set threshold to pass normally, while signals with frequencies above the set threshold are blocked and attenuated. Low-pass filtering can be simply considered as setting a frequency point where signals with frequencies higher than this cannot pass through. The coefficients of the low-pass filter are adjusted to minimize the phase difference between the first phase angle and the second phase angle. The coefficients of the low-pass filter can be 1500.

[0069] In this embodiment, the integral action of the proportional-integral controller makes the controller's output proportional to the integral of the deviation, thus eliminating residual error at the end of the transient process. However, the addition of integral action reduces stability. Increasing the proportional gain during integral action can maintain stability, but it increases overshoot and oscillation period, and lengthens the transient time. This controller is the most widely applicable, suitable for systems with small hysteresis in the regulating channel, minimal load changes, and where process requirements prohibit residual error. Through proportional and integral control, the phase difference between the first and second phase angles is brought closer to zero. The proportional control parameter can be 500-3000, and the integral control parameter can be 5-40.

[0070] In step S52, the target low-pass filter coefficients and target proportional-integral control parameters are obtained when the third phase angle is approximately equal to the second phase angle.

[0071] In this embodiment of the disclosure, the target low-pass filter coefficients and the target proportional-integral (PI) control parameters are adjusted so that the third phase angle is approximately equal to the second phase angle. That is, when the input phase angle and the output phase angle are approximately equal, the target low-pass filter coefficients and the target PI control parameters are recorded.

[0072] The following embodiments of this disclosure use a terminal as an example to illustrate the method for determining the phase angle of the input voltage without an electrolytic capacitor involved in the above embodiments of this disclosure.

[0073] Figure 6 This is a schematic diagram illustrating an exemplary embodiment of a method for determining the phase angle of an electrolytic capacitor-free input voltage.

[0074] See Figure 6 As shown in the embodiments of this disclosure, V in The input voltage is LPF, which is a low-pass filter. v For error; θ ge For the final output angle,

[0075] In this embodiment of the disclosure, the input voltage is input to the phase angle determination system. In the phase angle determination system, the input voltage is multiplied by the cosine function of the final output angle to obtain V. in *cosθ ge This refers to the component of the input voltage function along the y-axis.

[0076] In this embodiment of the disclosure, when initializing the phase angle determination system, θ can be preset. ge The value is set to 0 or based on experience. The low-pass filter and proportional-integral controller in the system are determined based on the phase angle, and θ is adjusted accordingly. ge The value of θ is determined. ge The value of .

[0077] In this embodiment of the disclosure, V in *cosθ ge The input is fed into the low-pass filter of the phase angle determination system to obtain... Where T is the low-pass filter parameter, and its value can be 1500. The purpose of inputting this parameter into the low-pass filter is to obtain the phase difference between the first and second phase angles. This phase difference is then input into the proportional-integral controller of the phase angle determination system to obtain... Among them, K P K is the proportional control parameter. I K is the integral control parameter. P The value of K can be between 500 and 3000. I The value can range from 5 to 40.

[0078] In this embodiment of the disclosure, the low-pass filter parameters, proportional control parameters, and integral control parameters of the low-pass filter and proportional-integral controller in the system are determined by adjusting the phase angle, and the phase difference is gradually adjusted to approach 0, that is, the third phase angle θ1 approaches θ. ge θ ge This refers to the final output angle: the phase angle of the input voltage.

[0079] Based on the same concept, embodiments of this disclosure also provide an apparatus for determining the phase angle of an electrolytic capacitor-free input voltage.

[0080] It is understood that the apparatus for determining the phase angle of an electrolytic capacitor-free input voltage provided in this disclosure includes hardware structures and / or software modules corresponding to each function in order to achieve the above-mentioned functions. In conjunction with the units and algorithm steps of the various examples disclosed in this disclosure, this disclosure can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the technical solutions of this disclosure.

[0081] Figure 7 This is a block diagram illustrating an apparatus for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment. (Refer to...) Figure 7 The device includes an acquisition unit 101, a processing unit 102, and a determination unit 103.

[0082] The acquisition unit 101 is used to acquire the target input voltage without electrolytic capacitors.

[0083] The processing unit 102 is used to input the target input voltage to a predetermined phase angle determination system, wherein the input of the phase angle determination system is the input voltage and the output is the phase angle of the input voltage.

[0084] The determining unit 103 is used to determine the phase angle of the target input voltage based on the output of the phase angle determining system.

[0085] In one embodiment, the phase angle determination system is predetermined as follows: a test input voltage is determined, the test input voltage having a first phase angle; a second phase angle is determined, and the second phase angle is used as the output phase angle of the phase angle determination system; a function operation is performed on the first phase angle and the second phase angle, and the result is input to the phase angle determination system, the phase angle determination system including a low-pass filter and a proportional-integral controller; the signal obtained after the function operation is low-pass filtered by the low-pass filter, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal; the phase difference is proportionally and integrally controlled by the proportional-integral controller to obtain a third phase angle; the third phase angle is used as the second phase angle, and the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system having the target low-pass filter coefficients and the target proportional-integral control parameters is obtained.

[0086] In another embodiment, the processing unit 102 performs function operations on the first phase angle and the second phase angle in the following manner: determining the sine function corresponding to the test input voltage with the first phase angle, and determining the cosine function of the second phase angle; and performing product processing on the sine function and the cosine function.

[0087] In another embodiment, the processing unit 102 obtains the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal in the following manner: performing a trigonometric function transformation of the product sum and difference on the low-pass filtered signal; multiplying the trigonometric function of the product sum and difference transformation with the error function to obtain the phase difference between the first phase angle and the second phase angle.

[0088] In another embodiment, the third phase angle satisfies the following formula: The third phase angle is denoted as θ1, and the proportional control coefficient is denoted as K. P The phase difference between the first phase angle and the second phase angle is expressed as The integral control coefficient is expressed as The processing unit 102 adjusts the coefficients of the low-pass filter and the control parameters of the proportional-integral controller in the following manner to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold: by adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller, the target low-pass filter coefficients and target proportional-integral control parameters are obtained when the third phase angle is approximately equal to the second phase angle.

[0089] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0090] Figure 8 This is a block diagram illustrating an apparatus 200 for determining the phase angle of an electrolytic capacitor-free input voltage according to an exemplary embodiment. For example, apparatus 200 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0091] Reference Figure 8 The device 200 may include one or more of the following components: processing component 202, memory 204, power component 206, multimedia component 208, audio component 210, input / output (I / O) interface 212, sensor component 214, and communication component 216.

[0092] Processing component 202 typically controls the overall operation of device 200, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 202 may include one or more processors 220 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 202 may include one or more modules to facilitate interaction between processing component 202 and other components. For example, processing component 202 may include a multimedia module to facilitate interaction between multimedia component 208 and processing component 202.

[0093] Memory 204 is configured to store various types of data to support the operation of device 200. Examples of such data include instructions for any application or method operating on device 200, contact data, phonebook data, messages, pictures, videos, etc. Memory 204 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0094] The power supply component 206 provides power to the various components of the device 200. The power supply component 206 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power to the device 200.

[0095] Multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 208 includes a front-facing camera and / or a rear-facing camera. When the device 200 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0096] Audio component 210 is configured to output and / or input audio signals. For example, audio component 210 includes a microphone (MIC) configured to receive external audio signals when device 200 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 204 or transmitted via communication component 216. In some embodiments, audio component 210 also includes a speaker for outputting audio signals.

[0097] I / O interface 212 provides an interface between processing component 202 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0098] Sensor assembly 214 includes one or more sensors for providing status assessments of various aspects of device 200. For example, sensor assembly 214 may detect the on / off state of device 200, the relative positioning of components such as the display and keypad of device 200, changes in the position of device 200 or a component of device 200, the presence or absence of user contact with device 200, the orientation or acceleration / deceleration of device 200, and temperature changes of device 200. Sensor assembly 214 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 214 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 214 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0099] Communication component 216 is configured to facilitate wired or wireless communication between device 200 and other devices. Device 200 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 216 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 216 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0100] In an exemplary embodiment, the apparatus 200 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0101] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 204 including instructions, which can be executed by a processor 220 of the device 200 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0102] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0103] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0104] It can be further understood that, unless otherwise specified, "connection" includes both direct connections where no other components exist between the two parties and indirect connections where other components exist between them.

[0105] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0106] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

[0107] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for determining the phase angle of an input voltage without an electrolytic capacitor, characterized in that, include: Obtain the target input voltage without electrolytic capacitors; The target input voltage is input to a predetermined phase angle determination system, where the input of the phase angle determination system is the input voltage and the output is the phase angle of the input voltage. Based on the phase angle, determine the output of the system, and then determine the phase angle of the target input voltage; The phase angle determination system pre-determines the phase angle using the following method: Determine the test input voltage, which has a first phase angle; Determine the second phase angle, and use the second phase angle as the phase angle to determine the output phase angle of the system; The first phase angle and the second phase angle are processed by a function and then input to the phase angle determination system, which includes a low-pass filter and a proportional-integral controller. The function operation includes: multiplying the input voltage by the cosine function of the second phase angle; or, determining the sine function corresponding to the test input voltage with the first phase angle, determining the cosine function of the second phase angle, and multiplying the sine function and the cosine function. The signal obtained after function operation is low-pass filtered by the low-pass filter, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal. The phase difference is controlled proportionally and integrally by the proportional-integral controller to obtain the third phase angle. Using the third phase angle as the second phase angle, the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system with the target low-pass filter coefficients and the target proportional-integral control parameters is obtained.

2. The method according to claim 1, characterized in that, The step of obtaining the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal includes: The low-pass filtered signal is processed by performing a product-difference trigonometric function transformation. The trigonometric function, after undergoing trigonometric transformation to product and difference, is multiplied with the error function to obtain the phase difference between the first phase angle and the second phase angle.

3. The method according to claim 1, characterized in that, Adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller to obtain target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold includes: By adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller, the target low-pass filter coefficients and target proportional-integral control parameters are obtained when the third phase angle is approximately equal to the second phase angle.

4. A device for determining the phase angle of an input voltage without an electrolytic capacitor, characterized in that, The device includes: The acquisition unit is used to acquire the target input voltage without electrolytic capacitors; The processing unit is used to input the target input voltage to a predetermined phase angle determination system, wherein the input of the phase angle determination system is the input voltage and the output is the phase angle of the input voltage; A determining unit is used to determine the output of the system based on the phase angle, and to determine the phase angle of the target input voltage; The phase angle determination system pre-determines the phase angle using the following method: Determine the test input voltage, which has a first phase angle; Determine the second phase angle, and use the second phase angle as the phase angle to determine the output phase angle of the system; The first phase angle and the second phase angle are processed by a function and then input to the phase angle determination system. The phase angle determination system includes a low-pass filter and a proportional-integral controller. The function operation includes: multiplying the input voltage by the cosine function of the second phase angle; or, determining the sine function corresponding to the test input voltage with the first phase angle, determining the cosine function of the second phase angle, and multiplying the sine function and the cosine function. The signal obtained after function operation is low-pass filtered by the low-pass filter, and the phase difference between the first phase angle and the second phase angle is obtained based on the low-pass filtered signal. The phase difference is controlled proportionally and integrally by the proportional-integral controller to obtain the third phase angle. Using the third phase angle as the second phase angle, the coefficients of the low-pass filter and the control parameters of the proportional-integral controller are adjusted to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold, and a phase angle determination system with the target low-pass filter coefficients and the target proportional-integral control parameters is obtained.

5. The apparatus according to claim 4, characterized in that, The processing unit obtains the phase difference between the first phase angle and the second phase angle based on the low-pass filtered signal in the following manner: The low-pass filtered signal is processed by performing a product-difference trigonometric function transformation. The trigonometric function, after undergoing trigonometric transformation to product and difference, is multiplied with the error function to obtain the phase difference between the first phase angle and the second phase angle.

6. The apparatus according to claim 4, characterized in that, The processing unit adjusts the coefficients of the low-pass filter and the control parameters of the proportional-integral controller in the following manner to obtain the target low-pass filter coefficients and target proportional-integral control parameters that make the phase difference less than a preset threshold: By adjusting the coefficients of the low-pass filter and the control parameters of the proportional-integral controller, the target low-pass filter coefficients and target proportional-integral control parameters are obtained when the third phase angle is approximately equal to the second phase angle.

7. A device for determining the phase angle of an input voltage without an electrolytic capacitor, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to perform the method for determining the phase angle of the electrolytic capacitor-free input voltage as described in any one of claims 1 to 3.

8. A storage medium, characterized in that, The storage medium stores instructions that, when executed by the processor of the terminal, enable the terminal, including the processor, to perform the method for determining the phase angle of the electrolytic capacitor-free input voltage as described in any one of claims 1 to 3.

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