Abstract: The present disclosure provides for various advantageous methods and apparatus of controlling electron emission. One of the broader forms of the present disclosure involves an electron emission element, comprising an electron emitter including an electron emission region disposed between a gate electrode and a cathode electrode. An anode is disposed above the electron emission region, and a voltage set is disposed above the anode. A first voltage applied between the gate electrode and the cathode electrode controls a quantity of electrons generated from the electron emission region. A second voltage applied to the anode extracts generated electrons. A third voltage applied to the voltage set controls a direction of electrons extracted through the anode.

Abstract: A tunable light-emitting diode (LED) lamp for producing an adjustable light output. In one embodiment, the LED lamp includes a drive circuit for driving LED dies in one of a plurality of light output configurations (e.g., a pre-sleep configuration, a phase-shift configuration, and a general lighting configuration). Further, the LED lamp may include an output-select controller and/or input sensor electrically coupled to the drive circuit to select the light output configuration. As such, the LED lamp is tunable to generate different levels of spectral output, appropriate for varying biological circumstance, while maintaining a commercially acceptable light quality and color rendering index.

Abstract: Representative embodiments of the invention provide a system, apparatus, and method of controlling an intensity and spectrum of light emitted from a solid state lighting system. The solid state lighting system has a first emitted spectrum at a full intensity level and at a selected temperature, with a first electrical biasing for the solid state lighting system producing a first wavelength shift, and a second electrical biasing for the solid state lighting system producing a second, opposing wavelength shift. Representative embodiments provide for receiving information designating a selected intensity level or a selected temperature; and providing a combined first electrical biasing and second electrical biasing to the solid state lighting system to generate emitted light having the selected intensity level and having a second emitted spectrum within a predetermined variance of the first emitted spectrum over a predetermined range of temperatures.

Abstract: A fault-tolerant controller for a lighting system comprising: a plurality of light emitting diode (LED) circuits and a controllable power source to power the plurality of LED circuits. The controller comprising a minimum voltage selector to determine a minimum voltage from a plurality of feedback voltages, one feedback voltage for each of the plurality of LED circuits. A control logic to regulate the drive voltage for the LEDs; and an overvoltage warning mechanism to determine an overvoltage of the drive voltage. The controller identifies one or more open-circuit conditions, one for each LED circuit, for which the respective feedback voltage is below an open-circuit threshold, and which causes the minimum voltage selector to exclude one or more respective feedback voltages associated with the LED circuits which have an open-circuit condition.

Abstract: A direction indication lamp control device includes: a current control element including an end which outputs a drive current having a magnitude corresponding to amplitude of a pulse signal; a current clamp unit which limits the drive current to a current upper limit value; a voltage clamp unit which limits a reference voltage to a voltage upper limit value; and a wire disconnection detection unit which outputs a wire disconnection detection signal in a case where the drive current corresponding to the pulse wave of the pulse signal is equal to or less than a wire disconnection detection value, or in a case where the reference voltage is equal to the voltage upper limit value. The current upper limit value is smaller than the drive current flowing through a direction indication lamp when the reference voltage is the voltage upper limit value.

Abstract: A method of controlling multiple street lamps with a mobile terminal includes receiving event information regarding a street lamp, among the multiple street lamps, from a gateway via an Internet in real-time. The event information indicates that a predetermined event has occurred in the street lamp. Notification information indicating that the event information has been received, is provided to a user of the mobile terminal in real-time. A control instruction for controlling the first street lamp based on control information input by the user, is transmitted to the first street lamp.

Abstract: A failsafe lighting system (1) comprises a lamp (L) and monitoring circuitry for monitoring the correct functioning of the lamp (L), the monitoring circuitry comprising an optical sensor (26) positioned for receiving light generated by the lamp (L). The monitoring circuitry comprises a self-oscillating loop (25) which includes the lamp (L) and the optical sensor (26), wherein the optical path between the lamp (L) and the optical sensor (26) is an essential portion of the loop (25) such that the loop (25) can only oscillate if the optical sensor (26) receives sufficient light from the lamp (L).

Abstract: Solid state transducer devices with independently controlled regions, and associated systems and methods are disclosed. A solid state transducer device in accordance with a particular embodiment includes a transducer structure having a first semiconductor material, a second semiconductor material and an active region between the first and second semiconductor materials, the active region including a continuous portion having a first region and a second region. A first contact is electrically connected to the first semiconductor material to direct a first electrical input to the first region along a first path, and a second contact electrically spaced apart from the first contact and connected to the first semiconductor material to direct a second electrical input to the second region along a second path different than the first path. A third electrical contact is electrically connected to the second semiconductor material.

Abstract: Methods and systems herein provide for determining lighting contributions of light fixtures to an environment. In one embodiment, a system includes a light sensor and a controller. The light sensor generates light level data based on measured light levels. The controller determines a nominal light level based on the light level data, and identifies an optical burst pattern in the light level data generated by a light fixture. The controller then determines a lighting contribution of the light fixture based on the optical burst pattern and the nominal light level.

Abstract: A garden light having a body with a post, the lower end of which is provided with a spike. The upper end of the post receives a lens assembly. Secured to the lens assembly is a cap assembly that has three LEDs that are activated to produce a varying colour light.

Abstract: A series connected light string using LEDs connected to an AC power source is disclosed. In order to make some or all of the lights color change, twinkle, and/or flash, controllers are provided in series with all or some of the LEDs. Because the supply source AC, but the active elements are essentially rectifiers, the circuit becomes a half wave DC circuit. Half wave DC will cause unpredictable behavior in DC circuit components. This will cause the controller to shut down during the zero voltage portion of the pulsating DC cycle. To prevent this a current supplying element is placed in parallel with the controller.

Abstract: This disclosure provides a circuit and a method for driving an LED display. The driving circuit comprises a selection circuit for selecting a first light emitter from the plurality of light emitters, a pre-charging circuit for charging an equivalent capacitor of the display panel with respect to the selected first light emitter, and a power circuit for supplying power to the first light emitter after the first light emitter is selected, wherein the power circuit is configured to supply a driving current to the first light emitter in one or more stages. The driving circuit and method of this disclosure can be used to significantly increase the refresh rate and resolution of the LED display.

Abstract: An apparatus (101) for driving a light source (102) is disclosed. The apparatus includes a first flyback AC/DC converter stage (103) having a first switch, a first switch controller and a comparator; and a second flyback AC/DC converter stage (104) having a second switch and a second switch controller, the second flyback AC/DC converter being electrically connected in parallel with the first flyback AC/DC converter stage.

Abstract: A piezoelectric resonant LED driving circuit, wherein a rectifier is used to rectify an AC voltage provided by the supply main into a DC voltage. Then, a quasi-resonant switching module performs resonance by means of the DC voltage to produce an induced current, to raise resonance frequency to operation frequency of a piezoelectric oscillator. Finally, the piezoelectric oscillator performs resonance and filtering using the induced current, to generate a sine wave current. Then, the sine wave current is rectified to output a DC current to drive an LED module.

Abstract: A system for controlling a level of light output by a solid state lighting load controlled by a dimmer includes a phase angle detector and a power converter. The phase angle detector is configured to detect a phase angle of the dimmer based on a rectified voltage from the dimmer and to determine a power control signal based on comparison of the detected phase angle with a predetermined first threshold. The power converter is configured to provide an output voltage to the solid state lighting load, the power converter operating in an open loop mode based on the rectified voltage from the dimmer when the detected phase angle is greater than the first threshold, and operating in a closed loop mode based on the rectified voltage from the dimmer and the determined power control signal from the detection circuit when the detected phase angle is less than the first threshold.

Abstract: In a first control mode, a control circuit turns a switching element on and off at a predetermined oscillating frequency and an On time so that a current flows through inductor in continuous mode without a sleep interval. In a second control mode, control circuit fixes oscillating frequency of switching element and changes On time of switching element. In a third control mode, control circuit fixes On time of switching element and changes oscillating frequency of switching element. Second control mode and third control mode are allocated for at least two intervals of intervals into which a dimming range is divided. Control circuit selects first control mode to fully light a light source load, and then, if a dimming ratio is designated, control circuit selects one of second and third control modes according to the interval, to which the dimming ratio corresponds, to dim light source load.

Abstract: The lighting apparatus in accordance with the present invention includes: a switching regulator including a switching element; and a control circuit configured to adjust a switching frequency and on-duration of the switching element in accordance with a dimming ratio. The control circuit is configured to, when the dimming ratio falls within a first dimming range, adjust the switching frequency to a frequency associated with the first dimming range and adjust the on-duration to duration corresponding to the dimming ratio. The control circuit is configured to, when the dimming ratio falls within a second dimming range, adjust the on-duration to duration associated with the second dimming range and adjust the switching frequency to a frequency corresponding to the dimming ratio.

Abstract: An illustrative LED driver circuit is based on a transition-mode power factor correction integrated circuit using flyback topology. The LED driver circuit features a universal input circuit having various fault and surge protections, output circuit open load and short circuit protection, and main transformer over temperature protection.

Abstract: In an electronic device including a discharge lamp, and a lamp power supply section that supplies power to the discharge lamp, a control section makes the lamp power supply section execute a lamp refresh process of supplying power necessary for generation of a halogen cycle to the discharge lamp at predetermined time intervals during low power operation in which the discharge lamp is lighted with power less than the rated power. Further, the control section records, in a recording section (non-volatile memory), a control instruction which is issued to the lamp power supply section during low power operation.

Abstract: A device includes a positive power supply voltage node; and a first operational amplifier including a first input, a second input, and an output coupled to the second input. The device further includes a first resistor coupled between the second input of the first operational amplifier and the positive power supply voltage node; a second resistor coupled between the output of the first operational amplifier and an electrical ground, and is configured to receive a same current flowing through the first resistor; a second operational amplifier including a first input coupled to the second resistor, and an output coupled to an output node; and a third resistor coupled between the electrical ground and a second input of the second operational amplifier.

Abstract: A modular system and method for providing power for LED lighting systems. The power source unit comprises (1) a power supply that converts A/C voltage to regulated D/C voltage, (2) a configurable intelligent gateway module that receives the regulated D/C voltage and places it on a power bus to which one or more power node modules and any accessories in need of power, such as motion detectors or cooling units, are coupled, and (3) an intelligent power node module that converts the regulated D/C voltage to a regulated D/C current and provides it to the particular LED Light Module (LLM), and which also receives data from the LLM, such as temperature data, and adjusts the regulated current accordingly. The gateway module also may receive control data from control devices, such as dimmers or wireless controllers, and instruct the power node module to regulate its output current accordingly.

Abstract: An LED driving device and its method are suitable for driving and regulating an illumination brightness of at least one LED. After switching the phase angle of an alternating voltage through a regulation circuit, an integration circuit and a filter circuit are utilized to generate a stable constant voltage. Next, the magnitude of the constant voltage is regulated in stage through a driving circuit based upon a control signal of a control circuit, and the voltage is converted into a constant current for driving the LED. Accordingly, the invention utilizes the constant current with stage variation to achieve the effect of linear dimming to prevent flickering.

Abstract: The specification discloses a lighting device and a method for controlling lighting with a lighting controller, wherein an example of the lighting device includes at least one light emitting device, and a lighting controller for controlling the light emitting device by predetermined communication protocol, wherein the lighting controller includes a touch unit provided to a front portion thereof having n points×m points gradations applied thereto for controlling at least one level of a color temperature level and a dimming level of the light emitting device based on information on at least one point generated according to user's touch, and the lighting controller further includes a control unit for generating and transmitting a control signal for controlling at least one level of the color temperature level and the dimming level according to information on at least one point from the touch unit.

Abstract: Disclosed herein is a remotely adjustable lighting system with security features. The lighting system includes a lamp (e.g., luminaire) which carries solid-state light sources and a sensor. The solid-state light sources emit visible light at an adjustable output intensity. The sensor is responsive to line-of-sight wireless signals, and the lamp increases and decreases the output intensity of the light sources in response to output signals of the sensor. The lamp provides security features by selectively accepting and rejecting instructions carried by the line-of-sight wireless signals to vary the output intensity of the light sources.

Abstract: An illumination system includes: a plurality of lighting devices; a control device for controlling the lighting devices; and a remote controller for remotely setting a control content to be performed by the control device. The remote controller includes: a light property setting unit for setting a light property of a control target lighting device; a pointer for emitting visible light to point the target lighting device; a projection position acquiring unit acquiring a projection position of the visible light; and a remote controller transmitting unit for wirelessly transmitting the property information indicative of the light property and the projection position information.

Abstract: A power supply for powering one or more loads includes a boost circuit with power factor correction (PFC) that provides an operating voltage from an electrical power source, and a dimmer detection circuit that determines a dimming level applied to the electrical power source, and generates a pulse width modulated (PWM) signal based upon the dimming level. The power supply also includes one or more current control circuits, each current control circuit being associated with each of the one or more loads, and coupled in series with the operating voltage, its associated load, and a ground of the power supply, so as to control a current through its associated load in response to the PWM signal.

Abstract: A light emission apparatus includes: a wiring board; a plurality of LED chips that are disposed on an LED chip mounting surface of the wiring board and are grouped into a plurality of LED groups; a wavelength conversion member that is disposed at a position corresponding to the LED chip mounting surface of the wiring board, converts a wavelength of light emitted by the corresponding LED chips, and emits first-order light with a different color temperature for each wavelength conversion region; a current supply section that supplies a driving current to the LED chips independently for each LED group through the wiring board; and a control section that controls the current amount supplied for each LED group in response to a control signal. The control section independently controls timing of starting to light the LED groups in accordance with the light control level.

Abstract: Lighting devices and/or systems offer dynamic control or tuning of color of light. The lighting systems utilize sources, such as solid state sources, to individually pump a number of different phosphors of types having relatively high degrees of color purity. The phosphor emissions, however, are still broader than the traditionally monochromatic color emissions of LEDs. The different phosphors can be independently excited to controllable levels, by individually controlled sources rated for emission of energy of the same spectrum. Adjustment of intensities of electromagnetic energy emitted by the sources independently adjusts levels of excitations of the phosphors selected to emit different colors of relatively high purity and thus the contributions of pure colors to the combined light output, for example, to enables color adjustment of the light output over a wide range of different selectable colors encompassing much of the gamut of visible light.

Abstract: Methods and apparatus related to controlling an apparatus such as a lighting fixture utilizing a communication protocol transmitted over the power line that feeds the lighting fixture. For example, in some embodiments data is transmitted over a three-phase power system via switching of a transformer electrically coupled to the three-phase power system. Optionally, a single transformer may be utilized to transmit data to at least on apparatus coupled to a first phase line of a three-phase power system and to at least one apparatus coupled to a second phase line of the three-phase power system.

Abstract: A control circuit selects a first control mode in which a switching element is turned on/off so as to flow current in an inductor in a continuous mode by which the current flows in the inductor without a sleep period, thereby fully lighting a light source load. The control circuit selects one of a second control mode in which a turn-on time of the switching element is changed and a third control mode in which an oscillating frequency is changed according to an interval, to which the designated dimming ratio corresponds, to light the light source load. An output capacitor connected between output terminals of a step-down chopper circuit smoothes a pulsation component of an output current supplied to the light source load and has capacity set so that a ripple ratio of the output current is less than 0.5 at the full lighting of the light source load.

Abstract: A control circuit selects a first control mode in which a switching element is turned on and off so that a current flows through an inductor in a critical or discontinuous mode, thereby fully lighting a light source load. The control circuit selects one of a second control mode in which On time of the switching element is changed and a third control mode in which an oscillating frequency is changed according to an interval, to which a designated dimming ratio corresponds, to dim the light source load. An output capacitor connected between output terminals of a step-down chopper circuit smoothes pulsation component of an output current supplied to the light source load and has capacity set so that a ripple ratio of the output current is less than 0.5 at full lighting of the light source load.

Abstract: An absence timer table for defining turn-on and turn-off operations in an absence timer mode is set. Then, a current time is checked. Then, it is determined whether or not the current time is an absence timer control start time. When it is determined that the current time is the absence timer control start time, absence timer control is started. Then, it is determined whether or not an input instruction has been received after absence timer control is started. When it is determined that the input instruction has been received after absence timer control is started, setting of the absence timer mode is cancelled. Then, the process ends (return).

Abstract: The present invention relates to a cyclotron capable or producing a first beam of accelerated charged particles defined by a first <<charge-over-mass>> ratio (q/m) or a second beam of accelerated charged particles defined by a second <<charge-over-mass>> ratio (q/m)? less than said first <<charge-over-mass>> ratio (q/m), said cyclotron comprising: an electromagnet comprising two poles, preferably an upper pole and a lower pole, positioned symmetrically relatively to a middle plane perpendicular to the central axis of the cyclotron and separated by a gap provided for circulation of the charged particles, each of said poles comprising several sectors positioned so as to have an alternation of areas with a narrow gap called <<hills>> and areas with a wide gap called <<valleys>>; a main induction coil for generating an essentially constant main induction field in the gap between said poles and a means for modifying the magnetic field profile according

Abstract: The system periodically measures the battery voltage of the toothbrush and the current in a stator portion of the motor for the appliance. The amplitude of movement of the toothbrush workpiece is determined from the measured stator current. A circuit/control program changes the duty cycle or pulse width of the drive signal from the motor if the battery voltage drops below a first threshold value and a circuit or control program changes the drive frequency of the appliance if the amplitude of the workpiece movement falls below a first threshold value. A circuit/control program terminates the operation of the toothbrush if the voltage drops below a second threshold value or if the amplitude drops below a second threshold value, both of which are less than the respective first thresholds.

Abstract: An exemplary motor control circuit for controlling a motor includes a motor driving chip, a sensing unit, and a controller. The motor driving chip motor driving chip is electronically connected to the motor. The sensing unit includes a proximity sensor, the proximity sensor detects whether an external object is proximate to the proximity sensor. The controller is electronically connected to the motor driving chip and the sensing unit, the controller controls the motor driving chip to drive the motor to rotate in a first direction when an external object is detected, and controls the motor driving chip to drive the motor to rotate in a second direction reverse to the first direction when no external object is detected for a predetermined period of time.

Abstract: An electric brake device is provided for electronically controlled synchronous motors which are supplied with voltage by way of a converter. The synchronous motor contains a winding center point and that the winding center point is connected by way of an electric resistor and a switch to a ground point of the converter and that the phases of the converter that are connected to the ground point contain in each case a free-wheeling diode.

Abstract: A motor controlling apparatus including an inverter, a voltage detector, a rotational speed detector, a command value calculating component, an inverter controller, a state detector and an offsetting component. The inverter converts direct-current power to alternating-current power supplied to a motor. The voltage detector detects a direct-current voltage, and the rotational speed detector detects a rotational speed of the motor. The calculating component calculates current and torque command values, and motor rotational speed. The controller provides a control signal to control the inverter based on the current command value. The state detector detects a control state of the inverter, and the offsetting component offsets the detected voltage or rotational speed by an offset amount. The calculating component modifies the current command value based on the offset detected voltage or rotational speed to increase on a negative side a d-axis current command value included in the current command value.

Abstract: A method is disclosed for controlling a synchronous motor by determining a rotor position of the synchronous motor based on estimating a flux linkage. The method includes applying a voltage of a stator winding of the motor to a transfer function. The transfer function includes an S-domain integration operation and an error correction variable. An output of the transfer function is processed to compensate for the error correction variable introduced in the transfer function. An estimated flux linkage is generated and an angle of the rotor position is computed based on the flux linkage. The computed rotor position is input to a controller for controlling a position or speed of the motor.

Abstract: A motor-drive circuit includes a detection circuit to detect a reverse current to flow in a direction from a first sink-side transistor to a second source-side transistor or in a direction from a second sink-side transistor to a first source-side transistor, a disable circuit to disable a detection output of the detection circuit during a predetermined time period from a start of detection of the reverse current performed by the detection circuit, a first inhibit circuit to inhibit synchronous rectification according to a detection output of the detection circuit when the predetermined time period has elapsed from a start of detection of the reverse current performed by the detection circuit, and a second inhibit circuit.

Abstract: A DC motor is provided. The DC motor prevents rush or overload of current in the DC motor during and/or after power input irregularities to the DC motor. A control circuit of the DC motor is configured to control current provided to the DC motor. When power irregularities in the power input to the DC motor are detected by the control circuit, the control circuit stops generating PWM (Pulse Width Modulated) signals and stops the current provided to the DC motor. After the stoppage of PWM signals, the control circuit can perform a soft-start of the PWM signals when the power irregularities are no longer detected. The soft starting of the PWM signals generates gradual increase in current to the DC motor, thus, preventing sudden rush of current that cause malfunction of the DC motor.

Abstract: A motor drive system comprising: an inverter that supplies power to a three-phase motor; and a control unit that controls switching elements of upper and lower arms included in the inverter by switching between supply control of controlling the switching elements so that alternating current is supplied to three phases of the three-phase motor and suspension control of controlling the switching elements so that the supply of current is stopped. The suspension control involves: putting and keeping, in a conduction state, a switching element of at least one upper arm each corresponding to one of one or more phases through which current flows in a direction entering the three-phase motor at a timing at which the supply of current is stopped, and putting and keeping switching elements of rest of the upper arms and switching elements of lower arms in a non-conduction state.

Abstract: A motor controlling apparatus includes a first target torque value calculator, a frequency detector, a second target torque value calculator, a torque command value calculator, a torque limiter, and a controller. The first target torque value calculator calculates a first target torque value, which is a target value of an output torque of a motor. The frequency detector detects a motor rotational frequency. The second target torque value calculator calculates a second target torque value based on the rotational frequency. The torque command value calculator mathematically combines (e.g., adds) the first and target torque values to calculate a torque command value. The torque limiter sets the signs of the first target torque value and the torque command value to be equal to limit the torque command value according to the first target torque value. The controller controls the motor based on the limited torque command value.

Abstract: An active system that can be pre-programmed to operate at a specific, emotionally significant moment. The system includes a meaningful sculpture (such as a heart, Star of David, cross, and so on), which in normal position is in a disassembled and non-harmonious state and which only when the preprogrammed moment arrives, is activated so that the sculpture is reassembled, becomes complete and harmonious. The system includes a casing, a motor, an internal clock, a transmission system, and a device that connects the sculpture parts to the transmission system. The system also includes display screens and a command and control panel.

Abstract: A linear actuator comprising a spindle, a spindle nut, a transmission, an electrical motor, and an actuation element, is arranged to linearly move the actuation element by means of an interaction of the spindle and the spindle nut, which interaction is being driven by the electrical motor through the transmission. A position of the actuation element, the relative position between spindle and spindle nut, is determined by means of an absolute rotary position sensor and a counter. The counter keeps track of the number of under-flows and over-flows the absolute rotary position sensor generates during movement of the actuation element. A combination of a value from the absolute rotary position sensor and a count from the counter determines the position.

Abstract: When a failure of a feedback control operation of an electric motor is sensed, a control unit changes the feedback control operation to an open loop control operation. At the time of executing the open loop control operation, the control unit sequentially changes the exciting phase of the motor without executing feedback of information of the count value of the encoder counter and rotates a rotor of the motor until a count value of an exciting phase change counter reaches an open loop target count value, which corresponds to a target rotational position of the rotor. When the control unit changes the feedback control operation to the open loop control operation, the control unit sets the open loop target count value by correcting a feedback target count value based on an exciting phase deviation correction value for the count value of the encoder counter.

Abstract: Certain embodiments of the present invention provide a battery heating circuit, wherein: the battery comprises a first battery and a second battery; the heating circuit comprises a first switch unit, a second switch unit, a damping component R1, a damping component R2, a current storage component L3, a current storage component L4, a switching control module and an energy storage component V1; the first battery, the damping component R1, the current storage component L3, the energy storage component V1 and the first switch unit are connected in series to constitute a first charging/discharging circuit; the second battery, the damping component R2, the current storage component L4, the energy storage component V1 and the second switch unit are connected in series to constitute a second charging/discharging circuit.

Abstract: A battery charging method and a battery pack using the same. The method including: counting an increased number of charging and discharging cycles of the battery for a first reference time; determining a user type of the battery according to the counted increased number of charging and discharging cycles; and reducing a charging voltage of the battery from a first reference voltage to a second reference voltage.

Abstract: The present invention discloses a charging management system and a charger with such charging management system. The charging management system includes a first signal-output port, a second signal-output port, a third signal-output port and a controller electrically connected with the first, second and third signal-output ports. The first and second signal-output ports are adapted for outputting first and second control signals representing first and second charging currents, respectively, to a charging circuit. The third signal-output port is adapted for outputting a third control signal representing a variable third charging current to the charging circuit. The controller controls the charging management system to operate under at least one of two modes. In the first mode, the controller alternately controls the first and second signal-output ports to output the first and second control signals. In the second mode, the controller only controls the third signal-output port to output the third control signal.

Abstract: A portable electronic device has a battery to provide power to operate the device, a connector including a power supply pin to be coupled to an external power supply, and a power manager having a battery charger circuit that draws power through the power supply pin to charge the battery. The power manager has a current limit feedback control loop that limits the drawn current in accordance with a predetermined output current rating of the external power supply. The power manager automatically changes the behavior of its control loop to stabilize operation of the coupled external power supply. Other embodiments are also described and claimed.

Abstract: A chargeable case of an electronic device includes an envelop body for enveloping an electronic device therein, a receiving coil, a power output interface and a built-in AC/DC rectifying circuit. The receiving coil wirelessly receives alternating current from a power supply device. The power output interface connects a power input interface of the electronic device. The AC/DC rectifying circuit is connected the receiving coil and the power output interface. The AC/DC rectifying circuit converts the received alternating current into direct current and supplies the direct current to the power output interface for charging the electronic device. A charging system is also disclosed.