Electronic device including power supply circuit and control method thereof

Abstract

This electronic device may: amplify, by using an error amplifier, a difference value between the amplitude of an output voltage (Vo) and the amplitude of a reference voltage (V_REF) on the basis that a difference between the output voltage (Vo) and the reference voltage (V_REF) has occurred, and output the amplified difference value as a current; output a second voltage (V2) by applying the output current to a second capacitor (C2) and a second resistor (R2); and generate an on-time control current (Ion) proportional to a third voltage that is a voltage across both terminals of the second resistor electrically connected to the second capacitor. The electronic device may: control a capacitor (C_on) connected to a current source (Ic) to be charged by using the current source (Ic) and the on-time control current (Ion); and control a switch of a power supply circuit to be turned off by using a second comparator when a voltage applied to the capacitor (C_on) connected to the current source (Ic) is equal to a turn-on voltage (VTON).

Description

Electronic device including power supply circuit and control method thereof

[0001] This document relates to an electronic device including a power supply circuit and a control method thereof. Specifically, it relates to an electronic device that controls a buck converter that stably supplies a constant voltage even under conditions of dynamic current changes.

[0002] Buck converters are primarily used to reduce voltage. They convert a high input voltage to a low output voltage. Buck converters enable efficient energy management in power supplies. Buck converters can consist of switching circuits, inductors, diodes, and capacitors. These components work together to regulate the input voltage to the required low voltage level. Furthermore, because buck converters transfer energy while minimizing power loss, they can be used in a variety of electronic devices and systems.

[0003] Conventional buck converter control methods have limitations in response speed. Specifically, because the on / off timing of the first gate PWM signal depends on the oscillator's clock signal, rapid output voltage regulation can be difficult. Furthermore, when load fluctuations occur, the inductor current's rate of increase and decrease is limited, making efficient power management difficult. Therefore, the development of a new control method capable of rapidly responding to load fluctuations may be necessary.

[0004] The electronic device may amplify the difference between the magnitude of the output voltage (Vo) and the magnitude of the reference voltage (V_REF) using an error amplifier based on the difference between the output voltage (Vo) and the reference voltage (V_REF) and output the difference as a current, apply the output current to a second capacitor and a second resistor to output a second voltage (V2), and generate an on-time control current (Ion) proportional to a third voltage, which is a voltage across a second resistor (R2) electrically connected to the second capacitor (C2). The electronic device may charge a capacitor (C_on) connected to the current source (Ic) using a current source (Ic) and the on-time control current (Ion), and control a switch of a power supply circuit to turn off when a voltage applied to the capacitor (C_on) connected to the current source (Ic) becomes equal to the turn-on voltage (VTON) using a second comparator.

[0005] The power supply circuit may include a first comparator for comparing a first voltage (V1) having a waveform related to a current flowing in an inductor (L) and a second voltage (V2) proportional to the difference between an output voltage (Vo) and a reference voltage (V_REF), a second comparator for comparing a voltage across a capacitor (C_on) (631) connected to a current source (Ic) and a turn-on voltage (VTON) that serves as a reference for operating a switch of the power supply circuit, and an error amplifier for amplifying a difference value between the magnitude of the output voltage (Vo) and the magnitude of the reference voltage (V_REF) and outputting the result as a current.

[0006] Electronic devices according to various embodiments of this document utilize an adaptive constant ON time control scheme to enable rapid recovery of output voltage in response to load fluctuations. This overcomes the limitations of conventional control-on-time (COT) schemes and enables rapid adjustment of inductor current even in situations where load current rapidly increases or decreases.

[0007] Electronic devices according to various embodiments of this document can reduce sensitivity to noise by simplifying the configuration of a circuit structure.

[0008] FIG. 1 is a block diagram of an electronic device within a network environment according to various embodiments.

[0009] FIG. 2 is a block diagram of a power management circuit and a battery according to various embodiments.

[0010] Figure 3a is a block diagram illustrating the structure of a buck converter.

[0011] Figure 3b is a graph to explain the response speed limit of a buck converter.

[0012] Fig. 4a shows a circuit diagram of a buck converter with ripple-based constant on time control applied.

[0013] Figure 4b is a graph to explain a situation in which the speed of increasing the inductor current of a buck converter to which constant on time control is applied is limited.

[0014] Figure 4c is a graph to explain a situation in which the speed of reducing the inductor current of a buck converter with constant on time control applied is limited.

[0015] Figure 5 shows a circuit diagram of a buck converter to which an adaptive constant on time control method is applied to overcome the limitations of the constant on time control method.

[0016] FIG. 6 illustrates a power supply circuit of an electronic device according to various embodiments of the present document.

[0017] Figure 7a illustrates a power supply circuit that minimizes the influence of noise by varying the charging current without varying the reference voltage of the comparator.

[0018] Figure 7b is a graph for explaining a situation in which the operating time (on time) of a control circuit is controlled by varying the reference voltage of a comparator.

[0019] Figure 7c is a graph for explaining a situation in which the on time of a control circuit is controlled by varying the charging current of a capacitor.

[0020] FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to various embodiments. Referring to FIG. 1, in the network environment (100), the electronic device (101) may communicate with the electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with at least one of the electronic device (104) or the server (108) via a second network (199) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), a haptic module (179), a camera module (180), a power management circuit (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In some embodiments, the electronic device (101) may omit at least one of these components (e.g., the connection terminal (178)), or may have one or more other components added. In some embodiments, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0021] The processor (120) may, for example, execute software (e.g., a program (140)) to control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (120) may store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the commands or data stored in the volatile memory (132), and store result data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor) or an auxiliary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (121). For example, when the electronic device (101) includes the main processor (121) and the auxiliary processor (123), the auxiliary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a given function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as a part thereof.

[0022] The auxiliary processor (123) may control at least a portion of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0023] The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or non-volatile memory (134).

[0024] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0025] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0026] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0027] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. According to one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0028] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0029] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0030] The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) with an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0031] The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0032] The haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0033] The camera module (180) can capture still images and videos. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0034] The power management circuit (188) can manage the power supplied to the electronic device (101). According to one embodiment, the power management circuit (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0035] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0036] The communication module (190) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device (104) via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0037] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0038] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module (197) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the at least one selected antenna. In some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0039] According to various embodiments, the antenna module (197) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0040] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0041] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the external electronic devices (102 or 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0042] Electronic devices according to the various embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments of this document are not limited to the aforementioned devices.

[0043] The various embodiments of this document and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can include any one of the items listed together in the corresponding phrase among those phrases, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as "coupled" or "connected" to another (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0044] The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0045] Various embodiments of the present document may be implemented as software (e.g., a program (140)) including one or more instructions stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a processor (e.g., a processor (120)) of the machine (e.g., an electronic device (101)) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' simply means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

[0046] According to one embodiment, the method according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smart phones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0047] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0048] FIG. 2 is a block diagram of a power management circuit and a battery according to various embodiments. Referring to FIG. 2, the power management circuit (188) may include a charging circuit (210), a power regulator (220), or a power gauge (230). The charging circuit (210) may charge the battery (189) using power supplied from an external power source for the electronic device (101). According to one embodiment, the charging circuit (210) may select a charging method (e.g., normal charging or rapid charging) based on at least some of the type of the external power source (e.g., power adapter, USB, or wireless charging), the amount of power that can be supplied from the external power source (e.g., about 20 watts or more), or the properties of the battery (189), and may charge the battery (189) using the selected charging method. The external power source may be connected to the electronic device (101) by wire, for example, via a connection terminal (178), or wirelessly via an antenna module (197).

[0049] The power regulator (220) can generate a plurality of powers having different voltages or different current levels by adjusting the voltage level or current level of the power supplied from, for example, an external power source or a battery (189). The power regulator (220) can adjust the power of the external power source or the battery (189) to a voltage or current level suitable for each of the components included in the electronic device (101). According to one embodiment, the power regulator (220) can be implemented in the form of an LDO (low drop out) regulator, a buck regulator, or a switching regulator. The power gauge (230) can measure usage status information for the battery (189) (e.g., capacity, number of charge / discharge cycles, voltage, or temperature of the battery (189).

[0050] The power management circuit (188) can determine charging state information (e.g., lifespan, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheat, short circuit, or swelling) related to charging of the battery (189) based at least in part on the measured usage state information, for example, using the charging circuit (210), the voltage regulator (220), or the power gauge (230). The power management circuit (188) can determine whether the battery (189) is normal or abnormal based at least in part on the determined charging state information. If the state of the battery (189) is determined to be abnormal, the power management circuit (188) can adjust charging of the battery (189) (e.g., reducing the charging current or voltage, or stopping charging). According to one embodiment, at least some of the functions of the power management circuit (188) can be performed by an external control device (e.g., the processor (120)).

[0051] The battery (189) may, according to one embodiment, include a battery protection circuit module (PCM) (240). The battery protection circuit (240) may perform one or more of various functions (e.g., a pre-cut function) to prevent performance degradation or damage to the battery (189). The battery protection circuit (240) may additionally or alternatively be configured as at least a part of a battery management system (BMS) that may perform various functions including cell balancing, capacity measurement of the battery, charge / discharge cycle measurement, temperature measurement, or voltage measurement.

[0052] According to one embodiment, at least a part of the usage status information or the charging status information of the battery (189) may be measured using a corresponding sensor (e.g., a temperature sensor) among the sensor modules (176), a power gauge (230), or a power management circuit (188). According to one embodiment, the corresponding sensor (e.g., a temperature sensor) among the sensor modules (176) may be included as a part of the battery protection circuit (240), or may be placed near the battery (189) as a separate device.

[0053] Figure 3a is a block diagram illustrating the structure of a buck converter.

[0054] The control circuit of Fig. 3a can compare the output voltage of the buck converter with a target voltage. The difference between the output voltage of the buck converter and the target voltage can be referred to as an error value (V_comp). The control circuit can compare the error value (V_comp) with a sawtooth wave (V_ramp) to determine the turn-off point of the gate. If the error value (V_comp) is relatively larger than the sawtooth wave, the control circuit can turn on a PWM (pulse width modulation) signal of the gate to increase the output voltage. The PWM (pulse width modulation) signal can be used to modulate the width of a digital output to generate an analog output. The PWM (pulse width modulation) signal can be used to control the voltage, current, or average value of a signal. The PWM signal has a constant frequency. The control circuit can modulate the pulse width of the signal within this frequency to control the time (ON time) that the buck converter operates and control the amount of energy supplied to the load.

[0055] Because PWM signals operate only in fully on (ON) or off (OFF) states, the energy loss that can occur in intermediate states is relatively small compared to other signals. Therefore, PWM signals offer the advantage of relatively high power conversion efficiency compared to other signals.

[0056] For example, in a buck converter, the output voltage can be adjusted by adjusting the pulse width of the PWM signal. The control circuit of the buck converter compares the output voltage with the target voltage and generates an error value (V_comp). If the size of the error value (V_comp) is relatively larger than the size of the sawtooth wave (Vramp), the control circuit can increase the pulse width of the PWM signal to increase the output voltage. Conversely, if the size of the error value (V_comp) is relatively smaller than the size of the sawtooth wave, the pulse width of the PWM signal can be reduced to lower the output voltage. Through this process, the buck converter can maintain a stable output voltage in response to various load conditions.

[0057] Whether a gate turns on can depend on the clock signal. Therefore, the gate won't turn on until the next clock signal occurs, which can slow down the response time. Since the pulse width of the PWM signal cannot be changed during the time when the clock signal is not present, the response time can also be slow. This delay can be particularly problematic in situations where rapid load changes must be addressed.

[0058] For example, if the load current suddenly increases, causing the output voltage to fall below the target voltage, the buck converter must immediately increase the pulse width of the PWM signal to increase the output voltage. However, this adjustment may be delayed depending on the clock signal generation cycle, resulting in a slow response time for the buck converter and degraded performance of the system or electronic device.

[0059] Figure 3b is a graph to explain the response speed limit of a buck converter.

[0060] The clock signal (301) may be generated at a constant cycle (320, 330). When V_comp (305) is relatively higher than the sawtooth wave (V_ramp) (303), the output voltage (311) may decrease as the load current (309) increases. The buck converter may turn on the PWM signal (307) to maintain a constant output voltage (311). However, since the clock signal (301) is provided at a constant cycle, the control circuit may have difficulty turning on the PWM signal (307) at a time point (e.g., 321, 323) when the clock signal (301) is not provided.

[0061] If the size of V_comp (305) is relatively larger than the size of the sawtooth wave (V_ramp) (303), the load current (309) may increase and the size of the output voltage (Vout) (311) may decrease. If the output voltage of the buck converter remains low or the recovery of the output voltage is slow, the performance of the overall system or electronic device may deteriorate.

[0062] Fig. 4a shows a circuit diagram of a buck converter with ripple-based constant on time control applied.

[0063] When ripple-based constant-on-time control is applied to a buck converter, the switching cycle changes in response to load fluctuations rather than relying on the oscillator clock, resulting in faster response characteristics compared to conventional fixed-frequency PWM control. This method has the advantage of responding quickly to load fluctuations and maintaining stable output voltage.

[0064] In the constant-on-time control method, the switching cycle is not fixed by the clock signal. When a load change occurs, a change in the Vcomp signal may occur, and the G1 (gate 1) gate may be turned on when a set signal based on the Vcomp signal and the ripple voltage (V_RPL) is detected.

[0065] For example, when the load current suddenly increases, a buck converter using a constant-on-time control method has a faster response characteristic than a conventional fixed-frequency PWM control because the control switching cycle is not fixed according to the clock of the oscillator, but changes in conjunction with the load fluctuation. When the output voltage decreases, the switch can be turned on based on the load fluctuation status, which can shorten the switch-on cycle, store more energy in the inductor, and consequently increase the current supplied to the load. The buck converter helps prevent the output voltage from dropping by storing more energy in the inductor.

[0066] However, this control method has a disadvantage in that the speed at which the inductor current increases when the load current increases is limited due to the fixed ON time and minimum OFF time constraints. That is, when attempting to increase the inductor current in response to a sudden increase in the load current, the speed at which the inductor current increases may not be fast enough due to the fixed ON time.

[0067] Figure 4b is a graph to explain a situation in which the speed of increasing the inductor current of a buck converter to which constant on time control is applied is limited.

[0068] The gate operates until the capacitor connected to the constant current source (Ic) is charged to the level of Vt,on. However, for safety, the gate has a set operating time, so even if it is turned on, it can be repeatedly turned off for a certain period of time (Toff_min).

[0069] During this process, the voltage proportional to the current flowing through the inductor may not continue to increase and may instead take on a sawtooth waveform. This is because the rate at which the inductor current increases is limited for safety reasons. Because the rate at which the inductor current increases is limited, it may be difficult to quickly recover the output voltage.

[0070] Figure 4c is a graph to explain a situation in which the speed of reducing the inductor current of a buck converter with constant on time control applied is limited.

[0071] On the other hand, the buck converter may remain turned on for a fixed period of time (430) even when the load current decreases. As the load current decreases, more energy than necessary may be stored in the inductor, which may result in the output voltage being higher than the target value. The buck converter needs to reduce the current flowing in the inductor to lower the output voltage. The buck converter needs to turn off to reduce the current flowing in the inductor. If the buck converter remains turned on, the rate at which the inductor current decreases may be slow.

[0072] For example, when the load current suddenly decreases, the buck converter may remain switched on for a fixed period of time (430). During this period, the inductor accumulates excess energy, which may temporarily increase the magnitude of the output voltage. The switch is then turned off, and the inductor begins to release the accumulated energy to the load. However, because excessive energy has already been accumulated, it may take a relatively long time for the output voltage to stabilize.

[0073] The ripple-based constant on time control method described in FIGS. 4a to 4c has fast response characteristics, but may have limitations in the response speed to load fluctuations due to the fixed ON time and minimum OFF time restrictions.

[0074] Figure 5 shows a circuit diagram of a buck converter to which an adaptive constant on time control method is applied to overcome the limitations of the constant on time control method.

[0075] Adaptive constant ON-time control, designed to overcome the limitations of the control on-time (COT) method, can enable rapid response to load fluctuations. For example, a buck converter can respond to sudden increases in load current.

[0076] When a power supply is supplying power to a load such as a CPU, the load current can suddenly increase significantly as the CPU switches to high-performance mode. In this case, a conventional buck converter with a controlled on-time (COT) design may have limitations in quickly supplying sufficient energy to the inductor due to its fixed on-time. This can lead to a rapid drop in output voltage and potentially compromise system stability.

[0077] On the other hand, the adaptive constant ON time control method of Fig. 5 can detect a decrease in the output voltage along with an increase in the load current and immediately increase the ON time in response. For example, the buck converter can charge a capacitor with the I_ramp current. The buck converter can be turned on until the magnitude of the voltage (Vcap) charged to the capacitor becomes equal to the magnitude of the V_FAOT voltage. When the load current increases rapidly, the output voltage decreases and the V_FLT signal is generated, and this signal increases the turn-on time of the buck converter, which can increase the energy supply to the inductor. By using this method, the buck converter can recover the output voltage relatively faster than the COT (control on-time) method.

[0078] Conversely, a buck converter can handle a sudden drop in load current. For example, a CPU may enter sleep mode, drastically reducing power consumption. In this case, the COT method may take time to release the energy stored in the inductor due to its minimum OFF time. This can cause a temporary increase in the output voltage.

[0079] On the other hand, in the adaptive constant ON time control method of Fig. 5, the buck converter can quickly detect an increase in the output voltage and thereby reduce the turn-on time of the buck converter, thereby reducing the energy supply to the inductor. The buck converter of the adaptive constant ON time control method of Fig. 5 can maintain the stability of the system by responding relatively quickly to a decrease in the load current. The adaptive constant ON time control method can quickly respond to load fluctuations through such dynamic ON time adjustment.

[0080] However, a buck converter using the adaptive constant ON time control method of Fig. 5 may require a differentiator circuit, such as a transient detector, to quickly respond to load fluctuations. Furthermore, a buck converter using the adaptive constant ON time control method has the disadvantage of requiring additional circuitry to remove the high-frequency ripple component of V_FLT. The differentiator circuit and the circuitry for removing the high-frequency ripple component can complicate the overall circuit configuration.

[0081] An electronic device including a power supply circuit according to this document may include a relatively simpler circuit instead of a complex circuit configuration of an adaptive constant ON time control method. This will be described in FIG. 6.

[0082] FIG. 6 illustrates a power supply circuit of an electronic device according to various embodiments of the present document.

[0083] Buck converters with adaptive constant ON time control use a transient detector including a complex differential circuit to quickly detect changes in output voltage due to load fluctuations. Electronic devices according to various embodiments of the present document (e.g., electronic device (101) of FIG. 1) can directly utilize a second voltage (V2) (Vcomp), which is a specific node of an error amplifier already present within a power supply, instead of a complex circuit. The specific node can be positioned at a location where it can quickly reflect changes in output voltage due to load fluctuations. By monitoring voltage changes at this node, the electronic device (101) can adjust the operating time (on time) of the buck converter in response to load fluctuations.

[0084] An electronic device (101) according to various embodiments of the present document may utilize a method for varying a charging current (Ion). Compared to a case where a method for varying a charging current is not utilized, the electronic device (101) may relatively reduce the sensitivity of a power supply circuit to external noise. In addition, compared to a case where a method for varying a charging current is not utilized, the electronic device (101) may relatively quickly respond to changes in an output voltage (Vo) and adjust the operating time (on time) of a switch of a power supply circuit (600).

[0085] The power supply circuit (600) of Fig. 6 can detect a sudden change in the output voltage (Vo) that is out of the control range by using the voltage (VERR) applied to the second resistor (R2) connected to the error amplifier (gm error amplifier) ​​(620) instead of a high pass filter. The mentioned control range is not fixed and may vary depending on the setting.

[0086] The power supply circuit (600) of FIG. 6 can vary the charging current of the capacitor (C_on) (631) of the second comparator (630) instead of the comparison voltage (VTON) for generating a turn-on signal of the second comparator (630) that determines the operating time (on time) of the buck converter. The power supply circuit (600) can minimize the influence of noise by using the charging current of the capacitor (C_on) (631).

[0087] The power supply circuit (600) can generate a first voltage (V1) (ripple voltage (V_RPL)) having a waveform similar to the current flowing in the inductor (L) through the first resistor (R1) and the first capacitor (C1) added between the switching node (611) and the output voltage (Vo). The power supply circuit (600) can compare the first voltage (V1) with the second voltage (V2) of the error amplifier (620) using the first comparator (610). Here, the second voltage (V2) is an error value (V) that means the difference between the magnitude of the output current (Vo) and the magnitude of the reference voltage (V_REF). COMP ) can mean.

[0088] When the magnitude of the first voltage (V1) becomes equal to the magnitude of the second voltage (V2) output from the error amplifier (620), the switch control / logic circuit (640) of the power supply circuit (600) is turned on (receiving a SET signal), and a turn-on PWM signal may be output to G1 (the first gate). The switch control / logic circuit (640) may include a form of a latch or a flip-flop. SET / CLR may refer to an input signal used to set or initialize data in a latch or a flip-flop. A latch may be used to maintain the state of an input signal. A basic form of a latch may include an SR (Set-Reset) latch. A latch may set an output to 1 based on an input to S (Set). SET may refer to an input that sets logic 1 (high voltage) to an output (Q). A latch can initialize its output to 0 based on an input to R (Reset). CLR can mean an input that initializes the output (Q) to logic 0 (low voltage). A latch can operate without a clock signal. A latch's output can change depending on the state of its input signal. A flip-flop is similar to a latch, but can be controlled by a clock signal.

[0089] In one embodiment, the first comparator (610) can compare a first voltage (V1) with a second voltage (V2) output from an error amplifier (gm error amplifier) ​​(620) to generate a driving signal input to G1 (the first gate).

[0090] A first voltage (V1) (ripple voltage (V_RPL)) may be applied to the inverting terminal (-) of the first comparator (610), and a second voltage (V2) (output voltage (V_comp)) of an error amplifier (gm error amplifier) ​​(620) may be applied to the non-inverting terminal (+). In various embodiments, the first voltage (V1) may be applied to the non-inverting terminal (+) of the first comparator (610), and a second voltage (V2) output from the error amplifier (gm error amplifier) ​​(620) may be applied to the inverting terminal (-).

[0091] An output voltage (Vo) may be applied to the inverting terminal (-) of the error amplifier (620), and a reference voltage (VREF) may be applied to the non-inverting terminal (+). In various embodiments, the reference voltage (VREF) may be applied to the inverting terminal (-) of the error amplifier (620), and the output voltage (Vo) may be applied to the non-inverting terminal (+). The error amplifier (620) may amplify the difference between the output voltage (Vo) and the reference voltage (VREF) to output a second voltage (V2), and apply the same to the first comparator (610).

[0092] Additionally, the amplified second voltage (V2) at the output terminal of the error amplifier (620) can charge the second capacitor (C2) and cause current to flow through the second resistor (R2). The current (Ion) can affect the charging of the capacitor (C_on) (631).

[0093] The power supply circuit (600) can increase the capacitor (C_on) (631) to the turn-on voltage (VTON) through the current source (Ic). When the PWM signal is turned on, the buck converter can maintain the turn-on state of the PWM signal for the time required to increase the capacitor (C_on) (631) to the turn-on voltage (VTON) through the current source (Ic). The on-time control current (Ion) can be changed based on the voltage (VERR) applied to the second resistor (R2). When the current flowing to the capacitor (C_on) (631) increases, the point in time when the voltage applied to the non-inverting terminal (+) of the second comparator (630) becomes equal to the turn-on voltage (VTON) can be relatively quicker. The second comparator (630) can output a CLR signal when the voltage applied to the non-inverting terminal (+) becomes equal to the turn-on voltage (VTON). An input can be applied to R (reset) of the switch control / logic circuit (640) to initialize it. The power supply circuit (600) can change the turn-on state of the buck converter to the off state based on the signal applied to the second gate (G2). When the on-time control current (Ion) flows to the capacitor (C_on) (631), the time for which the switch of the power supply circuit (600) is turned on can be relatively reduced.

[0094] Conversely, if the on-time control current (Ion) does not flow toward the capacitor (C_on) (631), the capacitor (C_on) (631) may be charged relatively more slowly. In this case, the point in time when the voltage applied to the non-inverting terminal (+) of the second comparator (630) becomes equal to the turn-on voltage (VTON) may become relatively slower. The voltage applied to the non-inverting terminal (+) of the second comparator (630) may mean the charging voltage of the capacitor (C_on) (631). The second comparator (630) may apply a signal to the second gate (G2) when the voltage applied to the non-inverting terminal (+) becomes equal to the turn-on voltage (VTON). The power supply circuit (600) may change the turn-on state of the buck converter to the off state based on the signal applied to the second gate (G2). If the on-time control current (Ion) does not flow in the direction of the capacitor (C_on) (631), the time for which the switch of the power supply circuit (600) is turned on can relatively increase.

[0095] In a normal state, the magnitude of the output voltage (Vo) may be equal to the magnitude of the reference voltage (V_REF). In this case, the magnitude of the output current of the error amplifier (620) becomes 0, and the voltage (VERR) applied to the second resistor (R2) may also become 0. At this time, the operating time (on time) of the switch of the power supply circuit (600) may be equal to the adaptive constant on time control method described in FIG. 5. The power supply circuit (600) may maintain the turn-on state of the buck converter until the charging voltage of the capacitor (C_on) (631) becomes equal to the turn-on voltage (VTON).

[0096] On the other hand, the size of the output voltage (Vo) may differ from the size of the reference voltage (V_REF) due to a change in the load. When the size of the output voltage (Vo) differs from the size of the reference voltage (V_REF), the power supply circuit (600) can generate a current (Ion) proportional to the difference in voltage size using the error amplifier (620) and connect it to the capacitor (C_on) (631). The power supply circuit (600) can control the size of the current supplied to the capacitor (C_on) (631) differently according to the change in the output voltage, thereby controlling the time at which the switch of the power supply circuit (600) is turned on.

[0097] According to one embodiment, the electronic device (101) may include a power supply circuit (600). The power supply circuit (600) may provide a target output voltage to the electronic device (101) based on an input voltage of a battery (e.g., battery (189) of FIG. 1).

[0098] According to one embodiment, the power supply circuit (600) may include a first comparator (610) for comparing a first voltage (V1) having a waveform related to a current flowing in an inductor (L) and a second voltage (V2) proportional to the difference between an output voltage (Vo) and a reference voltage (V_REF). The power supply circuit (600) may include a second comparator (630) for comparing a voltage across a capacitor (C_on) (631) connected to a current source (Ic) and a turn-on voltage (VTON) that serves as a reference for operating a switch of the power supply circuit. The power supply circuit (600) may include an error amplifier (620) for amplifying a difference value between a magnitude of the output voltage (Vo) and a magnitude of the reference voltage (V_REF).

[0099] According to one embodiment, the electronic device (101) can output a current by amplifying the difference between the magnitude of the output voltage (Vo) and the magnitude of the reference voltage (V_REF) using the error amplifier (620) based on the difference between the output voltage (Vo) and the reference voltage (V_REF). The electronic device (101) can apply the output current to a second capacitor (C2) and a second resistor (R2) to output a second voltage (V2). The electronic device (101) can charge the second capacitor (C2) using the second voltage (V2). The electronic device (101) can generate an on-time control current (Ion) proportional to a voltage (VERR) applied to a second resistor (R2) electrically connected to the second capacitor (C2). An electronic device (101) can charge a capacitor (C_on) (631) connected to the current source (Ic) using a current source (Ic) and an on-time control current (Ion). The electronic device (101) can control a switch of a power supply circuit (600) to be turned off when a voltage applied to the capacitor (C_on) connected to the current source (Ic) becomes equal to a turn-on voltage (VTON) using a second comparator (630).

[0100] According to one embodiment, the electronic device (101) can generate a first voltage (V1) having a waveform similar to a current flowing in the inductor (L) by using an inductor (L), a first resistor (R1), and a first capacitor (C1) between an input voltage (Vin) and an output voltage (Vo). The first voltage (V1) can include a ripple voltage.

[0101] According to one embodiment, the electronic device (101) can determine the point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal by using the first comparator (610). The electronic device (101) can generate an output signal by using the first comparator (610) at the point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal by using the first comparator (610) to turn on the switch of the power supply circuit (600).

[0102] According to one embodiment, the electronic device (101) can turn on a switch of a power supply circuit (600) to generate a PWM (pulse width modulation) signal based on the first voltage (V1) having the same value as the second voltage (V2).

[0103] According to one embodiment, the electronic device (101) can control the Ion on-time control current (Ion) to flow to a capacitor (C_on) connected to a current source (Ic).

[0104] According to one embodiment, the electronic device (101) can charge a capacitor (C_on) connected to the current source (Ic) using a current source (Ic) and an Ion on-time control current (Ion). The electronic device (101) can maintain a switch of the power supply circuit (600) in a turned-on state until a voltage applied to the capacitor (C_on) connected to the current source (Ic) becomes equal to a turn-on voltage (VTON).

[0105] According to one embodiment, the electronic device (101) can charge a capacitor (C_on) connected to the current source (Ic) using a current source (Ic) and an on-time control current (Ion). The electronic device (101) can generate an output signal using a second comparator (630) based on the voltage applied to the capacitor (C_on) connected to the current source (Ic) becoming equal to a turn-on voltage (VTON). The electronic device (101) can change a switch of a power supply circuit to a turn-off state based on a signal output from the first comparator (610).

[0106] According to one embodiment, the electronic device (101) can initialize the magnitude of the voltage applied to the capacitor (C_on) connected to the current source (Ic) to 0 when the switch of the power supply circuit (600) is turned off.

[0107] According to one embodiment, the electronic device (101) can output a second voltage (V2) using the error amplifier (620) based on a difference between the output voltage (Vo) and the reference voltage (V_REF) exceeding a specified level. The electronic device (101) can control the second capacitor (C2) to be charged using the second voltage (V2) so that a voltage is applied to the second resistor (R2). The electronic device (101) can detect a change in the output voltage (Vo) based on the magnitude of the voltage applied to the second resistor (R2) connected to the error amplifier (620).

[0108] According to one embodiment, the electronic device (101) can generate an on-time control current (Ion) using a voltage applied to a second resistor (R2) connected to an error amplifier (620). The electronic device (101) can change the on-time control current (Ion) based on a change in the magnitude of the voltage applied to the second resistor (R2). The electronic device (101) can control a point in time when the magnitude of the voltage applied to a capacitor (C_on) connected to a current source (Ic) becomes equal to the magnitude of the turn-on voltage (VTON) by changing the on-time control current (Ion), and can adjust the turn-on time of a switch of a power supply circuit (600).

[0109] Figure 7a illustrates a power supply circuit that minimizes the influence of noise by varying the charging current without varying the reference voltage of the comparator.

[0110] As described in Fig. 6, the capacitor (C_on) (731) can be charged by a current source (Ic). A turn-on voltage (VTON) can be applied to the inverting terminal (-) of the comparator (730). A voltage (Vc_on) applied to both terminals of the capacitor (C_on) (731) can be applied to the non-inverting terminal (+) of the comparator (730). The types of voltages applied to the inverting terminal (-) and the non-inverting terminal (+) of the comparator (730) may be opposite. The comparator (730) can output a control signal when the magnitude of the voltage (Vc_on) applied to both terminals of the capacitor (C_on) (731) becomes equal to the magnitude of the turn-on voltage (VTON). The buck converter can change the turn-on state to turn-off based on the control signal.

[0111] Figure 7b is a graph for explaining a situation in which the on time of a control circuit is controlled by varying the reference voltage of a comparator.

[0112] As described in Fig. 7a, the comparator (730) can output a signal by comparing the turn-on voltage (VTON) and the voltage (Vc_on) applied to both ends of the capacitor (C_on) (731). For example, at t1, the voltage (Vc_on) applied to both ends of the capacitor (C_on) (731) and

[0113] The comparator (730) can compare the voltage across the capacitor based on the variable turn-on voltage (VTON). Noise may occur momentarily in the turn-on voltage (VTON). A point (740) may occur where the turn-on voltage (VTON) and the voltage across the capacitor become momentarily equal. The comparator (730) can output a signal when the turn-on voltage (VTON) and the voltage across the capacitor become momentarily equal. That is, the buck converter may be turned off at the point (740) where the turn-on voltage (VTON) and the voltage across the capacitor become momentarily equal. However, since the voltage across the capacitor is different from the turn-on voltage (VTON), the buck converter may need to be turned on again after a certain period of time.

[0114] If it operates normally without noise, the buck converter can operate without turning off the buck converter at t2. In this case, the output voltage of the buck converter would have become equal to the reference voltage at a point earlier than t3, and would have become stable relatively more quickly. However, due to the occurrence of noise, the buck converter is turned off at t2, and after a certain period of time, it is turned on again, and the point in time at which the output voltage of the buck converter becomes equal to the reference voltage may be delayed. An electronic device (e.g., the electronic device (101) of FIG. 1) including a power supply circuit according to this document (e.g., the power supply circuit (600) of FIG. 6) can operate the comparator (730) by keeping the turn-on voltage fixed instead of using the turn-on voltage (VTON) as a reference, and measuring the voltage across the capacitor by varying the charging current of the capacitor. This will be described in FIG. 7c.

[0115] Figure 7c is a graph for explaining a situation in which the on time of the control circuit is controlled by varying the charging current of the capacitor.

[0116] The power supply circuit can calculate the charge (Q) by integrating the current with respect to time. The voltage change across the capacitor can be calculated by integrating the current in the capacitor with respect to time.

[0117] By varying the current charged into the capacitor, the voltage across the capacitor and the turn-on voltage (VTON) can be compared. Even if noise (750) occurs in the current charged into the capacitor, the voltage across the capacitor can be minimized. Since the calculation is performed by integrating the current charged into the capacitor, the influence of short-term noise can be reduced. This is because the noise in the current charged into the capacitor only has an instantaneous effect, and its influence is reduced when integrated over time.

[0118] According to one embodiment, the magnitude of the voltage (V_c,on) across the capacitor and the magnitude of the turn-on voltage (VTON) become equal at t4, so that the buck converter may be turned off. Thereafter, the voltage (V_c,on) across the capacitor may change due to a change in the magnitude of the current source Ic, so that the buck converter may be turned on again. Noise (750) may be generated in the current source Ic. The comparator (730) may operate based on the voltage (V_c,on) across the capacitor obtained by integrating the current of the current source Ic. When integrating the current, noise (750) generated at a specific point in time (t5) may not have a significant effect on the magnitude of the voltage (V_c,on) across the capacitor. Therefore, the comparator (730) can output a signal at the moment when the magnitude of the voltage (V_c,on) across the capacitor becomes equal to the magnitude of the fixed turn-on voltage (VTON), rather than at the moment (t5) when noise (750) is generated in the current source Ic.

[0119] Therefore, an electronic device (e.g., electronic device (101) of FIG. 1) including a power supply circuit (e.g., power supply circuit (600) of FIG. 6) according to this document can efficiently operate a buck converter by minimizing the influence of noise.

Claims

1. In an electronic device including a power supply circuit, battery; A power supply circuit (600) is included that provides a target output voltage to the electronic device based on the input voltage of the battery, The above power supply circuit A first comparator (610) for comparing a first voltage (V1) having a waveform related to a current flowing in an inductor (L) and a second voltage (V2) proportional to the difference between an output voltage (Vo) and a reference voltage (V_REF); A second comparator (630) that compares the voltage across both terminals of a capacitor (C_on) (631) connected to a current source (Ic) and a turn-on voltage (VTON) that serves as a reference for operating a switch of the power supply circuit; and It includes an error amplifier (620) that amplifies the difference between the size of the output voltage (Vo) and the size of the reference voltage (V_REF) and outputs it as a current. The above electronic device Based on the difference between the output voltage (Vo) and the reference voltage (V_REF), the difference between the size of the output voltage (Vo) and the size of the reference voltage (V_REF) is amplified using the error amplifier and output as current. The output current is applied to the second capacitor (C2) and the second resistor to output the second voltage (V2), Generate an on-time control current (Ion) proportional to a third voltage, which is a voltage across a second resistor (R2) electrically connected to the second capacitor (C2), Using the current source (Ic) and the on-time control current (Ion), the capacitor (C_on) (631) connected to the current source (Ic) is charged, An electronic device that controls the switch of the power supply circuit to turn off when the voltage applied to the capacitor (C_on) connected to the current source (Ic) using the second comparator becomes equal to the turn-on voltage (VTON).

2. In paragraph 1, The above electronic device By using an inductor (L), a first resistor (R1), and a first capacitor (C1) between an input voltage (Vin) and an output voltage (Vo), a first voltage (V1) having a waveform similar to the current flowing in the inductor (L) is generated, An electronic device in which the first voltage (V1) includes a ripple voltage whose magnitude changes based on the magnitude of the current flowing in the inductor.

3. In paragraph 1, The above electronic device Using the first comparator, the point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal is determined, An electronic device that generates an output signal using the first comparator at a point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal to each other, thereby turning on the switch of the power supply circuit.

4. In paragraph 3, The above electronic device An electronic device that generates a PWM (pulse width modulation) signal that turns on a switch of the power supply circuit based on the first voltage (V1) having the same value as the second voltage (V2).

5. In paragraph 1, The above electronic device An electronic device that controls the on-time control current (Ion) to flow to a capacitor (C_on) connected to the current source (Ic).

6. In paragraph 1, The above electronic device Using the current source (Ic) and the on-time control current (Ion), the capacitor (C_on) connected to the current source (Ic) is charged, An electronic device that controls the switch of the power supply circuit to be kept in a turned-on state until the voltage applied to the capacitor (C_on) connected to the current source (Ic) becomes equal to the turn-on voltage (VTON).

7. In paragraph 6, The above electronic device Using the current source (Ic) and the on-time control current (Ion), the capacitor (C_on) connected to the current source (Ic) is charged, Generating an output signal using the second comparator based on the voltage applied to the capacitor (C_on) connected to the current source (Ic) being equal to the turn-on voltage (VTON), An electronic device that turns off the switch of the power supply circuit based on the signal output from the second comparator.

8. In paragraph 1, The above electronic device An electronic device that maintains the voltage applied to a capacitor (C_on) connected to a current source (Ic) at 0 when the switch of the above power supply circuit is turned off.

9. In paragraph 1, The above electronic device Based on the difference between the output voltage (Vo) and the reference voltage (V_REF) exceeding a specified level, the difference between the magnitude of the output voltage (Vo) and the magnitude of the reference voltage (V_REF) is amplified using the error amplifier and output as current. The output current is applied to the second capacitor (C2) and the second resistor (R2) to output the second voltage (V2), An electronic device that detects a change in output voltage (Vo) based on the magnitude of the voltage applied to the second resistor (R2) connected to the error amplifier.

10. In paragraph 9, The above electronic device Generate the on-time control current (Ion) by using the voltage applied to the second resistor (R2) connected to the error amplifier, The on-time control current (Ion) is changed based on the change in the magnitude of the voltage applied to the second resistor (R2), By changing the above on-time control current (Ion), the point in time when the magnitude of the voltage applied to the capacitor (C_on) connected to the current source (Ic) becomes equal to the magnitude of the turn-on voltage (VTON) is controlled, An electronic device that controls the turn-on time of a switch of the above power supply circuit.

11. In the power supply circuit, A first comparator (610) for comparing a first voltage (V1) having a waveform related to a current flowing in an inductor (L) and a second voltage (V2) proportional to the difference between an output voltage (Vo) and a reference voltage (V_REF); A second comparator (630) that compares the voltage across both terminals of a capacitor (C_on) (631) connected to a current source (Ic) and a turn-on voltage (VTON) that serves as a reference for operating a switch of the power supply circuit; and It includes an error amplifier (620) that amplifies the difference between the size of the output voltage (Vo) and the size of the reference voltage (V_REF) and outputs it as a current. The above power supply circuit Based on the difference between the output voltage (Vo) and the reference voltage (V_REF), the difference between the size of the output voltage (Vo) and the size of the reference voltage (V_REF) is amplified using the error amplifier and output as current. The output current is applied to the second capacitor (C2) and the second resistor to output the second voltage (V2), Generate an on-time control current (Ion) proportional to a third voltage, which is a voltage across a second resistor (R2) electrically connected to the second capacitor (C2), Using the current source (Ic) and the on-time control current (Ion), the capacitor (C_on) (631) connected to the current source (Ic) is charged, A power supply circuit having a structure that controls the switch of the power supply circuit to turn off when the voltage applied to the capacitor (C_on) connected to the current source (Ic) using the second comparator becomes equal to the turn-on voltage (VTON).

12. In paragraph 11, The above power supply circuit A structure is included that generates a first voltage (V1) having a waveform similar to a current flowing in the inductor (L) by using an inductor (L), a first resistor (R1), and a first capacitor (C1) between an input voltage (Vin) and an output voltage (Vo), The above first voltage (V1) is a power supply circuit including a ripple voltage.

13. In paragraph 11, The above power supply circuit Using the first comparator, the point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal is determined, A power supply circuit having a structure that generates an output signal using the first comparator at a point in time when the magnitude of the first voltage (V1) and the magnitude of the second voltage (V2) become equal, thereby turning on the switch of the power supply circuit.

14. In paragraph 13, The above power supply circuit A power supply circuit having a structure that generates a PWM (pulse width modulation) signal that turns on a switch of the power supply circuit based on the first voltage (V1) having the same value as the second voltage (V2).

15. In paragraph 11, The above power supply circuit A power supply circuit having a structure that controls the above Ion on-time control current (Ion) to flow to a capacitor (C_on) connected to the above current source (Ic).

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