Current adjusting circuit and method and electronic equipment

Abstract

The embodiment of the invention discloses a current adjusting circuit and method and electronic equipment, and the circuit comprises an error amplifier which is electrically connected with a power supply, and is configured to execute error amplification processing according to the feedback voltage of the power supply and a preset reference voltage, so as to obtain an error current; the arithmetic unit is electrically connected with the error amplifier and is configured to compare the error current with a reference current and obtain an additional current according to a comparison result; and the adjuster is electrically connected with the arithmetic unit and the oscillator and is configured to adjust the charging current of the oscillator according to the additional current. According to the technical scheme of the invention, the charging current of the oscillator can be adaptively adjusted when the output voltage of the power supply changes, the ripple change caused by the change of the power supply or the load can be effectively inhibited, the switching loss is not increased, and the risk of electromagnetic interference is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of electronic technology, and more particularly to a current regulation circuit, method, and electronic device. Background Technology

[0002] In power conversion circuits, output ripple control has always been a crucial technical challenge. Low ripple output can reduce output noise and electromagnetic interference (EMI), while also mitigating screen flicker caused by power supply fluctuations, reducing water ripples or noise during camera shooting, and providing a safer power range for subsequent circuits. Furthermore, some systems have stringent requirements for power supply and load transient response, while traditional architectures, limited by system bandwidth or overall EMI requirements, cannot achieve adequate output transient response.

[0003] Based on the above-mentioned technical problems, this disclosure proposes a charging current control scheme, which can achieve transient response of the power supply while controlling the frequency change amplitude within a small range, so as to reduce output ripple and EMI interference. Summary of the Invention

[0004] In view of this, the present disclosure provides a current adjustment scheme that can adaptively adjust the charging current of the oscillator according to the output voltage change of the power supply, so as to effectively suppress the output voltage ripple and reduce electromagnetic interference.

[0005] According to a first aspect of this disclosure, a current adjustment circuit is provided for use in an oscillator, wherein the current adjustment circuit includes: an error amplifier electrically connected to the power supply and configured to perform error amplification processing based on a feedback voltage of the power supply and a preset reference voltage to obtain an error current; an arithmetic unit electrically connected to the error amplifier and configured to compare the error current with a preset reference current and obtain an additional current based on the comparison result; and an adjuster electrically connected to the arithmetic unit and the oscillator and configured to adjust the charging current of the oscillator based on the additional current.

[0006] According to a second aspect of this disclosure, a current adjustment method is provided for use in an oscillator, wherein the current adjustment method includes: performing error amplification processing based on the feedback voltage of the power supply and a preset reference voltage to obtain an error current; comparing the error current with a preset reference current and obtaining an additional current based on the comparison result; and adjusting the charging current of the oscillator based on the additional current.

[0007] According to a third aspect of this disclosure, an electronic device is provided, including a current adjustment circuit as described in the first aspect and an oscillator connected to the current adjustment circuit to adjust the charging current of the oscillator via the current adjustment circuit.

[0008] According to the current adjustment scheme of the oscillator provided in the embodiments of this disclosure, when a change in the power supply output voltage is detected, the charging current of the oscillator can be adaptively adjusted, which can keep the oscillation frequency within a small range, effectively reduce output ripple, and reduce output noise and electromagnetic interference. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings.

[0010] Figure 1 This is a simplified structural diagram of a current regulation circuit that is an exemplary embodiment of the present disclosure.

[0011] Figure 2 According to Figure 1 The diagram shows an exemplary circuit structure of the current adjustment circuit.

[0012] Figure 3 According to Figure 1 An exemplary circuit structure diagram of the arithmetic unit of the current adjustment circuit shown.

[0013] Figure 4 This is a flowchart illustrating the current adjustment method of an exemplary embodiment of the present disclosure.

[0014] List of reference numerals in the attached diagram:

[0015] 100. Power supply

[0016] 101. Oscillator

[0017] 104. Capacitor

[0018] 110. Current adjustment circuit

[0019] 112. Error Amplifier

[0020] 114. Arithmetic Unit

[0021] 116. Regulator

[0022] 200. DC-DC converter

[0023] 204. Capacitor

[0024] 212. Error Amplifier

[0025] 214. Arithmetic Unit

[0026] 216. Regulator

[0027] 222. Comparator

[0028] 224. Charge / discharge switch

[0029] 310. First operational circuit

[0030] 312. Reference Current Injection Unit

[0031] 314. First MOSFET

[0032] 316. Second MOSFET

[0033] 320. Second operational circuit

[0034] 322. Reference Current Extraction Unit

[0035] 324. Third MOSFET

[0036] VREF DCDC Reference voltage (DC-CDC converter)

[0037] VFB DCDC Feedback voltage (DC-CDC converter)

[0038] I EAOUT Error current

[0039] I add Additional current

[0040] I FlX Reference current

[0041] I limit Additional current range

[0042] IB OSC The bias current (charging current) of the oscillator

[0043] VREF C capacitor reference voltage

[0044] V C Actual voltage of capacitor Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art should fall within the protection scope of the present invention.

[0046] Reference is made to the accompanying drawings, which form part of the detailed description and illustrate exemplary embodiments. Furthermore, it should be understood that other embodiments may be utilized, and structural and / or logical changes may be made without departing from the scope of the claimed subject matter. It should also be noted that orientations and references (e.g., up, down, top, bottom, etc.) may be used merely to facilitate the description of features in the drawings. Therefore, the following detailed description is not to be construed in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and their equivalents.

[0047] Numerous details are set forth in the following description. However, it will be apparent to those skilled in the art that the embodiments described herein can be practiced without these specific details. In some instances, well-known methods and apparatus are shown in block diagram form rather than in detail to avoid obscuring the embodiments described herein. Throughout this specification, references to “embodiment,” “one embodiment,” or “some embodiments” mean that a particular feature, structure, function, or characteristic described in connection with that embodiment is included in at least one embodiment herein. Therefore, the phrases “in an embodiment,” “in one embodiment,” or “some embodiments” appearing throughout this specification do not necessarily refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, functions, or characteristics can be combined in any suitable manner. For example, a first embodiment can be combined with a second embodiment in any way that does not mutually exclude particular features, structures, functions, or characteristics associated with two embodiments.

[0048] As used in the description and appended claims, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0049] The terms “coupling” and “connection”, along with their derivatives, are used herein to describe functional or structural relationships between components. It should be understood that these terms are not intended to be synonyms for each other. Rather, in certain embodiments, “connection” can be used to indicate that two or more elements are in direct physical, optical, or electrical contact with each other. “Coupling” can be used to indicate that two or more elements are in direct or indirect physical or electrical contact with each other (with other intermediary elements between them), and / or that two or more elements cooperate or interact with each other (e.g., as in a causal relationship).

[0050] As used herein, the terms “above,” “below,” “between,” and “on” refer to the relative position of a component or material with respect to other components or materials, where such physical relationships are noteworthy. For example, in the context of materials, a material positioned above or below another material may be in direct contact with it, or may have one or more intermediate materials. Furthermore, a material positioned between two materials may be in direct contact with both layers, or may have one or more intermediate layers. In contrast, a first material or material “on” a second material or material is in direct contact with that second material / material. Similar distinctions are made in the context of component assembly.

[0051] As described throughout this document and in the claims, a list of items connected by the terms “at least one of” or “one or more of” may mean any combination of the listed items. For example, the phrase “at least one of A, B, or C” may mean A; B; C; A and B; A and C; B and C; or A, B, and C.

[0052] The terms "circuit" or "module" can refer to one or more passive and / or active components arranged to cooperate with each other to provide a desired function. The term "signal" can refer to at least one current signal, voltage signal, or magnetic signal. The terms "substantially," "close to," "approximately," "near," and "about" generally refer to within + / 10% of the target value.

[0053] In power conversion circuits, output ripple control has always been a crucial technical challenge. Low ripple output effectively reduces noise and electromagnetic interference (EMI), while also minimizing screen flicker caused by power supply issues, avoiding water ripples or noise during camera shooting, and providing a safer power range for subsequent circuits. Furthermore, some systems have stringent requirements for power supply and load transient response, but traditional architectures, limited by system bandwidth or overall EMI requirements, often struggle to achieve ideal output transient response.

[0054] In existing technologies, the main techniques for reducing output ripple and improving transient response include the following:

[0055] 1. Increase the switching frequency of the DC-DC converter. However, an excessively high switching frequency will lead to increased switching losses and shorten the sampling time, affecting the minimum duty cycle.

[0056] 2. A constant on-time (COT) architecture is adopted. However, while the COT architecture can respond quickly to load changes, its switching frequency is greatly affected by the input and output voltages, resulting in a wide frequency variation range. Although the improved ACOT architecture can reduce the frequency variation range by adjusting the on-time (Ton) and input and output voltages, it still cannot avoid the problem of a large frequency variation range, increasing the difficulty of EMI filtering.

[0057] 3. Increasing feedforward control or improving system bandwidth can improve transient response, but may lead to additional power consumption or design complexity.

[0058] Based on the above-mentioned technical problems, the embodiments of this disclosure provide a current adjustment scheme that can effectively suppress output ripple while taking into account both fixed frequency limitations and transient response.

[0059] The specific implementations of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings:

[0060] Current adjustment circuit

[0061] Figure 1 This is a simplified structural diagram of a current adjustment circuit according to an exemplary embodiment of the present disclosure. The current adjustment circuit 110 of this embodiment can be applied to an oscillator 101.

[0062] It should be noted that the technical solution disclosed herein is applicable to various oscillators 101 commonly found on the market. To avoid obscuring the technical focus of this disclosure, the oscillator 101 shown in the accompanying drawings only illustrates the electronic components (capacitor 104) directly related to the technical solution disclosed herein. It should be understood that in practical applications, the oscillator 101 may also include other electronic components such as inductors, diodes, and loads.

[0063] As shown in the figure, the current adjustment circuit 110 of this embodiment mainly includes: an error amplifier (EAAMP) 112, an arithmetic unit 114, and an adjuster 116.

[0064] Error amplifier 112 is electrically connected to power supply 100 and is configured to perform error amplification processing based on the feedback voltage of power supply 100 and a preset reference voltage to obtain error current.

[0065] In this embodiment, the feedback voltage is used to characterize the magnitude of the output voltage of the power supply 100.

[0066] In some embodiments, the error amplifier 112 can calculate the voltage difference between the feedback voltage and the reference voltage, and obtain the error current based on the product of the voltage difference and the transconductance parameter of the error amplifier 112.

[0067] For example, power supply 100 may be DC-DC converter 200 (reference). Figure 2 ).

[0068] The arithmetic unit 114 is electrically connected to the error amplifier 112 and is used to compare the error current with a preset reference current and obtain an additional current based on the comparison result.

[0069] In some embodiments, the arithmetic unit 114 is configured to compare the absolute value of the error current with a reference current to obtain an additional current.

[0070] In some embodiments, if the comparison result shows that the absolute value of the error current is less than or equal to the reference current, the additional current is set to zero. By means of this mechanism, the charging current of the oscillator 101 can be adjusted only if there is a significant change in the feedback voltage of the detection power supply 100.

[0071] In this embodiment, if the absolute value of the error current is greater than the reference current, the difference between the absolute value of the error current and the reference current is calculated to obtain the additional current.

[0072] In some embodiments, if the reference current is set to 0, the oscillator system will always operate at a low frequency variation, which is equivalent to spread spectrum reduction of EMI.

[0073] The regulator 116 is electrically connected to the arithmetic unit 114 and the capacitor 104, and is configured to adjust the charging current of the capacitor 104 according to the additional current of the arithmetic unit 114, so that the oscillator 101 can charge the capacitor 104 based on the adjusted charging current.

[0074] Specifically, the input terminal of the regulator 116 is electrically connected to the arithmetic unit 114, and the output terminal of the regulator 116 is electrically connected to the capacitor 104. The regulator 116 can superimpose the additional current of the arithmetic unit 114 and the bias current (charging current) of the oscillator 101, and charge the capacitor 104 based on the superimposed charging current.

[0075] In summary, the current adjustment circuit provided in this embodiment adaptively adjusts the charging current of the oscillator by comparing the feedback voltage and reference voltage of the power supply. This enables transient response to power supply changes while keeping the amplitude of oscillation frequency changes within a small range, thereby effectively suppressing the output ripple of the charging circuit.

[0076] Furthermore, by setting a reasonable reference current, this embodiment can limit the output deviation at the start of the oscillation frequency conversion, thereby optimizing system stability and EMI performance.

[0077] Figure 2 According to Figure 1 The diagram shows an exemplary circuit structure of the current adjustment circuit.

[0078] Error amplifier 212 is electrically connected to DC-DC converter 200, and it can adjust according to the feedback voltage VFB of DC-DC converter 200. DCDC and the reference voltage VREF of the DC-DC converter 200 DCDC Perform error amplification processing to obtain the error current I. EAOUT .

[0079] In this embodiment, the error amplifier 212 can convert the feedback voltage VFB of the DC-DC converter 200. DCDC As a negative feedback input, the reference voltage VREF of the DC-DC converter 200 is used. DCDC As a positive feedback input, it calculates the voltage difference between the feedback voltage and the reference voltage, and performs a product operation based on the voltage difference and the transconductance parameter of the error amplifier 212 to obtain the error current I. EAOUT .

[0080] In practical applications, the error amplifier 212 can calculate the error current using the following formula 1:

[0081] I EAOUT =gmea×(VREF) DCDC -VFB DCDC ) (Formula 1)

[0082] In Equation 1, IEAOUT represents the error current, gmea represents the transconductance parameter of error amplifier 212, and VREF... DCDC VFB represents the reference voltage of the DC-DC converter 200. DCDC This indicates the feedback voltage of the DC-DC converter 200.

[0083] According to Formula 1 above, when the reference voltage of the DC-DC converter 200 is greater than the feedback voltage (i.e., VREF) DCDC >VFB DCDC The resulting error current IEAOUT is a positive current (i.e., the error current flows out from the error amplifier 212); conversely, when the reference voltage of the DC-DC converter 200 is less than the feedback voltage (i.e., VREF), the error current is negative. DCDC <VFB DCDC The resulting error current IEAOUT is a negative current (i.e., the error current flows in reverse into the error amplifier 212).

[0084] The input terminal of the arithmetic unit 214 is electrically connected to the error amplifier 212. The arithmetic unit 214 can obtain the error current from the error amplifier 212 and convert the absolute value of the error current |I EAOUT |With reference current I FIX By comparison, the additional current I is obtained. add .

[0085] In this embodiment, if the comparison result shows that the absolute value of the error current is less than or equal to the reference current (i.e., |I_0.05|), then... EAOUT |≤I FIX Set the additional current to zero (I). add =0), thus ensuring that the charging current of the oscillator is adjusted only when the output voltage of the DC-DC converter 200 changes significantly.

[0086] In this embodiment, if the comparison result shows that the absolute value of the error current is greater than the reference current (i.e., |I_0.05|), then... EAOUT |>I FIX The difference between the absolute value of the error current and the reference current is calculated to obtain the additional current.

[0087] When the absolute value of the comparison error current is greater than the reference current, and the reference voltage of the DC-DC converter 200 is greater than the feedback voltage (i.e., |I EAOUT |>I FIX VREF DCDC >VFB DCDC In the case of ), the additional current can be obtained by subtracting the reference current from the absolute value of the error current (refer to Formula 2 below).

[0088] I add =|I EAOUT |-I FIX (Formula 2)

[0089] When the absolute value of the comparison error current is greater than the reference current, and the reference voltage of the DC-DC converter 212 is less than the feedback voltage (i.e., |I EAOUT |>I FIX VREF DCDC <VFB DCDC Then, based on the difference between the absolute value of the reference current and the error current, the additional current is obtained (refer to Formula 3 below).

[0090] I add =I FIX -|I EAOUT | (Formula 3)

[0091] In formulas 2 and 3, I add Indicates the additional current, |I EAOUT | represents the absolute value of the error current, I FIX This represents the reference current.

[0092] In some embodiments, the reference current I can be used to... FIX Setting it to 0 ensures that the oscillator system always operates at a lower frequency, which is equivalent to spreading the spectrum to reduce EMI.

[0093] In some embodiments, the arithmetic unit 214 may also transfer the additional current I add With the preset additional current range I limit If the additional current is greater than the upper limit of the additional current range (i.e., I), then... add >I limit_max The upper limit value will be updated to the new additional current (i.e., I). add =I limit_max If the additional current is less than the lower limit of the additional current range (i.e., I), add <I limit_min The lower limit value is updated to the new additional current (i.e., I). add =I limit_min If the additional current falls within the range of the additional current, the additional current will not be updated.

[0094] In some embodiments, the additional current range I can be set according to the ideal maximum variation frequency of the oscillator. limit This disclosure does not impose any restrictions on this matter.

[0095] The regulator 216 is positioned between the arithmetic unit 214 and the capacitor 204, and can adjust the additional current I output by the arithmetic unit 214. add and the bias current IB of the oscillator OSC (i.e., charging current) are superimposed, and based on the adjusted current (i.e., I) add +IB OSC Charge capacitor 204.

[0096] In some embodiments, the charging and discharging operation of capacitor 204 can be controlled by setting comparator 222 and charge / discharge switch 224.

[0097] Specifically, comparator 222 is electrically connected to capacitor 204, and it can obtain the actual voltage V of capacitor 204. C And the actual voltage V of the capacitor C As a negative feedback input, the preset capacitor reference voltage VREF is used. C As a positive feedback input, it is used to compare the actual capacitor voltage V in real time. C and capacitor reference voltage VREF C Wherein, when the actual voltage V of the capacitor C Greater than the capacitor reference voltage VREF C When the comparator 222 outputs a low-potential signal, it controls the charge / discharge switch 224 to switch to the closed state, causing the capacitor 204 to discharge and reducing the actual voltage V of the capacitor. C Continuously decrease until the actual voltage V of the capacitor is reached. C Less than the capacitor reference voltage VREF CWhen the capacitor 204 is in a charging state, the comparator 222 outputs a high-potential signal to control the charge / discharge switch 224 to switch to the off state, so that the capacitor 204 can charge. This cycle repeats to achieve the charging and discharging control of the capacitor 204.

[0098] As can be seen from the above, the current adjustment circuit in this embodiment can effectively suppress output voltage ripple by adaptively adjusting the charging voltage of the capacitor by comparing the power supply feedback voltage and the power supply reference voltage.

[0099] Specifically, when the power supply reference voltage is greater than the power supply feedback voltage (VREF) DCDC >VFB DCDC When the error current is positive, the adjusted capacitor charging current will increase, causing the oscillator frequency controlled by the capacitor charging current to increase. Since the on-time (Ton) of the switching transistor is fixed, the increased oscillator frequency means a shorter off-time (Toff) of the switching transistor, resulting in a larger duty cycle and a faster rise in output voltage. Similarly, when the power supply reference voltage is less than the power supply feedback voltage (VREF),... DCDC <VFB DCDC Since the error current is negative, the adjusted capacitor charging current will decrease, and the oscillator frequency controlled by the capacitor charging current will slow down. With the on-time (Ton) of the switching transistor remaining constant, the slower oscillator frequency means a longer off-time (Toff) of the switching transistor, a smaller duty cycle, and a faster drop in output voltage. Therefore, the technical solution disclosed in this paper can effectively suppress output ripple.

[0100] Furthermore, this embodiment sets a reference current I. FIX To limit the output deviation at the start of oscillator frequency conversion, and by setting an additional current range I kimit This limits the range of oscillation frequency variation, thereby effectively controlling the amplitude of oscillation frequency (OSC frequency) variation, and can balance EMI and output ripple adjustment.

[0101] In summary, the current adjustment method of this embodiment can effectively reduce the output ripple changes caused by power supply or load changes by changing the oscillation frequency within a small range, without increasing switching losses or posing a risk of electromagnetic interference.

[0102] Figure 3 According to Figure 1 An exemplary circuit diagram of the arithmetic unit 114 of the current adjustment circuit is shown. As shown, the arithmetic unit 114 of this embodiment includes a first arithmetic circuit 310 and a second arithmetic circuit 320 connected to the error amplifier 112, wherein the input current (I) of the first arithmetic circuit 310 is... EAOUT1 ), the input current of the second operational circuit (I) EAOiT2 ) and the error current (I) output by error amplifier 112 EAOUTAll are equal (i.e., I) EAOUT1 =I EAOUT2 =I EAOUT ).

[0103] The first operational circuit 310 is configured to operate when the reference voltage is less than the feedback voltage (VREF). DCDC <VFB DCDC This allows the error amplifier 112 to conduct when the output error current is negative, by passing the reference current I. FIX Injected error current I EAOUT In the process, an additional current I is obtained. add .

[0104] For example, in Figure 3 In the example shown, the first operational circuit 310 includes a reference current injection unit 312 and a mirror unit composed of a first MOSFET 314 and a second MOSFET 316. The first MOSFET 314 and the second MOSFET 316 share a common gate, and the gate and drain of the first MOSFET 314 are connected.

[0105] The reference current injection unit 312 generates a reference current, injects the generated reference current into the error current, and then flows into the first MOSFET 314. Specifically, when the current flowing into the first MOSFET 314 is a negative current (i.e., |I_0|),... EAOUT1 |>I FIX When the first MOSFET 314 is turned on, the drain of the second MOSFET 316 can replicate the drain input current of the first MOSFET 314 proportionally (ideally exactly the same) to achieve current mirroring, thereby obtaining the additional current I of the first operational circuit 310. add Conversely, when |I EAOUT1 |<I FIX In this case, if the first MOSFET 314 is turned off, the additional current output by the first operational circuit 310 is zero (I add =0).

[0106] The second operational circuit 320 is configured to operate when the reference voltage is greater than the feedback voltage (VREF). DCDC >VFB DCDC This allows the error amplifier 112 to conduct when the output error current is positive, and the error current I is drawn from the error current I. EAOUT Extracting the reference current I FIX The additional current I is obtained. add .

[0107] For example, in Figure 3In the example shown, the second operational circuit 320 includes a reference current extraction unit 322 and a third MOSFET 324. The reference current extraction unit 322 is used to extract a reference current from the error current. The drain of the third MOSFET 324 is connected to the reference current extraction unit 322, and the gate of the third MOSFET 324 is connected to the drain.

[0108] Wherein, when the input current of the second operational circuit is less than the reference current (I EAOUT2 <I FIX Since no current flows into the third MOSFET 324, the additional current output by the second operational circuit 320 is zero (I). add =0), when the input current of the second operational circuit is greater than the reference current (|I EAOUT2 |>I FIX The third MOSFET 324 will generate a mirror current, thus obtaining an additional current I. add .

[0109] In summary, the circuit structure of the arithmetic unit provided in this embodiment can effectively control the additional current, thereby improving the adjustment effect of the oscillator charging current.

[0110] Current adjustment method

[0111] Figure 4 The current adjustment method, an exemplary embodiment of this disclosure, can be applied to an oscillator including a power supply and a capacitor. As shown in the figure, the current adjustment method of this embodiment includes the following steps:

[0112] Step 402: Perform error amplification processing based on the feedback voltage of the power supply and the preset reference voltage to obtain the error current.

[0113] In some embodiments, the voltage difference between the feedback voltage and the reference voltage can be calculated by an error amplifier, and the error current can be obtained by performing a product operation based on the voltage difference and the transconductance parameter of the error amplifier.

[0114] Step 404: Compare the error current with the preset reference current, and obtain the additional current based on the comparison result.

[0115] In some embodiments, the absolute value of the error current can be compared with the reference current by an arithmetic unit to obtain the additional current. Specifically, if the absolute value of the error current is less than or equal to the reference current, the additional current is set to zero; if the absolute value of the error current is greater than the reference current, the difference between the absolute value of the error current and the reference current is calculated to obtain the additional current.

[0116] In some embodiments, if the reference voltage is greater than the feedback voltage, the additional current is obtained by subtracting the reference current from the absolute value of the error current; if the reference voltage is less than the feedback voltage, the additional current is obtained by subtracting the absolute value of the error current from the reference current.

[0117] In some embodiments, the additional current can be compared with a preset additional current range. If the additional current is greater than the upper limit of the additional current range, the upper limit is updated to the new additional current. If the additional current is less than the lower limit of the additional current range, the lower limit is updated to the new additional current. If the additional current falls within the additional current range, the additional current is not updated.

[0118] Step 406: Adjust the charging current of the oscillator according to the additional current.

[0119] In some embodiments, the additional current and the oscillator's charging current can be superimposed by an adjuster to charge the capacitor based on the superimposed current.

[0120] electronic devices

[0121] Another embodiment of this disclosure provides an electronic device, including the current adjustment circuit described in the above embodiments and an oscillator connected to the current adjustment circuit, so as to adjust the charging current of the oscillator through the current adjustment circuit.

[0122] Specific embodiments of the subject matter have now been described. Other embodiments are within the scope of the appended claims. In some cases, the actions described in the claims can be performed in a different order and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing can be advantageous.

[0123] It should also be noted that improvements to a technology can be hardware improvements (e.g., improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to the methodology), or even direct improvements to the hardware circuit structure. Therefore, it cannot be said that an improvement to a methodology cannot be implemented using hardware modules. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit whose logic function is determined by the user programming the device. Designers can program a digital system onto a PLD themselves, without needing chip manufacturers to design and fabricate dedicated integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing integrated circuit chips, this programming is mostly implemented using "logic compiler" software. Similar to the software compiler used in program development, the original code before compilation must be written in a specific programming language, called a Hardware Description Language (HDL). There are many HDLs, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, and RHDL (Ruby Hardware Description Language). Currently, VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog are the most commonly used. Those skilled in the art should understand that by simply performing some logic programming on the method flow using one of these hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logical method flow can be easily obtained.

[0124] The controller can be implemented in any suitable manner. For example, it can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0125] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0126] For ease of description, the above devices are described separately by function as various units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0127] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0128] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0132] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0133] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0134] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0135] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0136] This application can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific transactions or implement specific abstract data types. This application can also be practiced in distributed computing environments where transactions are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0137] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0138] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A current regulation circuit, applied to an oscillator, wherein, The current adjustment circuit includes: An error amplifier, which is electrically connected to a power supply, is configured to perform error amplification processing based on the feedback voltage of the power supply and a preset reference voltage to obtain an error current; An arithmetic unit, electrically connected to the error amplifier, is configured to compare the error current with a preset reference current and obtain an additional current based on the comparison result. An adjuster, which is electrically connected to the arithmetic unit and the oscillator, is configured to adjust the charging current of the oscillator according to the additional current.

2. The current adjustment circuit according to claim 1, wherein, The power supply includes a DC-DC converter; The error amplifier is configured to take the feedback voltage of the DC-DC converter as a negative feedback input and the reference voltage as a positive feedback input to calculate the voltage difference between the feedback voltage and the reference voltage, and perform a product operation based on the voltage difference and the transconductance parameter of the error amplifier to obtain the error current.

3. The current adjustment circuit according to claim 1, wherein, The input terminal of the arithmetic unit is electrically connected to the error amplifier; The arithmetic unit is configured to obtain the error current from the error amplifier, compare the absolute value of the error current with the reference current, and obtain the additional current. Wherein, if the absolute value of the error current is less than or equal to the reference current, the additional current is set to zero; if the absolute value of the error current is greater than the reference current, the difference between the absolute value of the error current and the reference current is calculated to obtain the additional current.

4. The current adjustment circuit according to claim 3, wherein, If the absolute value of the error current is greater than the reference current, the arithmetic unit is further configured to: If the reference voltage is greater than the feedback voltage, the additional current is obtained by subtracting the reference current from the absolute value of the error current; or If the reference voltage is less than the feedback voltage, the additional current is obtained based on the difference between the absolute value of the reference current and the absolute value of the error current.

5. The current adjustment circuit according to claim 4, wherein, The arithmetic unit includes a first arithmetic circuit and a second arithmetic circuit connected to the error amplifier; The first operational circuit is configured to turn on when the reference voltage is less than the feedback voltage, such that the error current output by the error amplifier is a negative current, and obtain the additional current by injecting the reference current into the error current; The second operational circuit is configured to conduct when the reference voltage is greater than the feedback voltage, such that the error current output by the error amplifier is a positive current, and obtains the additional current by extracting the reference current from the error current.

6. The current adjustment circuit according to claims 3 to 5, wherein, The arithmetic unit is further configured as follows: The additional current is compared with a preset additional current range. If the additional current is greater than the upper limit of the additional current range, the upper limit is updated to the new additional current. If the additional current is less than the lower limit of the additional current range, the lower limit is updated to the new additional current. If the additional current falls within the additional current range, the additional current is not updated.

7. The current adjustment circuit according to claim 1, wherein, The oscillator includes a capacitor; The regulator is configured to superimpose the additional current of the arithmetic unit and the charging current of the oscillator to charge the capacitor based on the superimposed current.

8. A current regulation method applied to an oscillator, wherein, The current adjustment method includes: Error amplification processing is performed based on the feedback voltage of the power supply and the preset reference voltage to obtain the error current; The error current is compared with a preset reference current, and the additional current is obtained based on the comparison result. The charging current of the oscillator is adjusted according to the additional current.

9. The current adjustment method according to claim 8, wherein, The step of comparing the error current with a preset reference current and obtaining an additional current based on the comparison result includes: The absolute value of the error current is compared with the reference current. If the absolute value of the error current is less than or equal to the reference current, the additional current is set to zero; if the absolute value of the error current is greater than the reference current, the difference between the absolute value of the error current and the reference current is calculated to obtain the additional current.

10. The current adjustment method according to claim 9, wherein, The calculation of the difference between the absolute value of the error current and the reference current to obtain the additional current includes: The feedback voltage is compared with the reference voltage. If the reference voltage is greater than the feedback voltage, the additional current is obtained by subtracting the reference current from the absolute value of the error current; or, if the reference voltage is less than the feedback voltage, the additional current is obtained by subtracting the absolute value of the error current from the reference current.

11. An electronic device comprising a current adjustment circuit according to any one of claims 1 to 7 and an oscillator connected to the current adjustment circuit for adjusting the charging current of the oscillator via the current adjustment circuit.

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