Abstract: An apparatus can include: a bleeder circuit coupled to a DC bus of an LED driver having a silicon-controlled dimmer, where the bleeder circuit is controlled to discharge a current of the DC bus; a controller configured to control the bleeder circuit to discharge the DC bus at a first current after detecting a transition in a voltage of the DC bus; and the controller being configured to control the bleeder circuit to discharge the DC bus at a second current until the DC bus voltage rises to a predetermined load driving voltage, where the second current is less than the first current.

Abstract: The present disclosure relates to a capacitor step-down LED driver and a driving method using the same. A capacitor step-down LED driver comprises a control circuit and a switching circuit. The control circuit turns on or off the switching circuit in response to an output current and an output voltage of the capacitor step-down LED driver, and thus controls an amount of energy supplied from an input side to an output side. In a first operation state, the switching circuit is controlled not to supply energy from the input side to the output side. In a second operation state, the switching circuit is controlled to supply energy from the input side to the output side. Thus, the output current is maintained to be a value of a desired driving current.

Abstract: A loudspeaker diaphragm state estimation method includes: adjusting a weight value of a diaphragm displacement model by adaptive filtering until an error between an estimated value of a driving voltage of a loudspeaker and a measured value of the driving voltage is less than a predetermined threshold; estimating a diaphragm relative displacement of the loudspeaker according to the diaphragm displacement model corresponding to a final determined weight value; determining a diaphragm relative speed at a next moment based on an input current, a product value of a vector determined by an estimated value of a diaphragm relative speed and an estimated value of a diaphragm relative displacement, and a weight value vector obtained at a present moment; and determining an estimated value of the driving voltage using the estimated value of the diaphragm relative speed, the input current, and a DC impedance of the loudspeaker at the present moment.

Abstract: A method of controlling an LED driver can include: generating a first comparison signal using a first reference voltage, the first comparison signal having a duty cycle in accordance with an alternating current input voltage generated by a transformer of the LED driver, and representing an operation frequency of an input source; generating a conversion voltage signal by an averaging operation of the first comparison signal with a time constant that is greater than a switching period of an electronic transformer; generating a second comparison signal by comparing the conversion voltage signal against a second reference voltage; and determining whether the transformer is the electronic transformer or a power frequency transformer based on the second comparison signal.

Abstract: Disclosed is a method and a device for detecting states of a battery and a battery pack. The disclosure obtains a first state of charge and a second state of charge of the battery by use of a charge calculation method and a method based on battery model, respectively. The charge calculation method is more accurate when the charge-discharge current is large and the method based on battery model performs better in handling a small current, so that a chemistry state of charge obtained by performing a weighted calculation for the first state of charge and the second state of charge can represent the real state of charge of the battery more precisely. The disclosure settles the difficulty on parameter extraction of the conventional model method, eliminates the influence of the accumulated error of the charge calculation method, and combines the advantages of the method based on the battery model and the coulometer method.

Abstract: An apparatus can include: (i) a network controller in a mesh network, the network controller being configured to send a beacon in a predetermined beacon slot in a broadcast manner, where the beacon includes a slot allocation state of the mesh network; and (ii) a plurality of node devices, where each node device is configured to synchronize according to the beacon, and to send a data packet within a corresponding fixed time slot according to the slot allocation state, where each of the fixed time slots corresponds to only one of the plurality of node devices.

Abstract: A photoelectric sensor can include: a lighting element configured to generate a first optical signal, where a second optical signal is generated by reflection of the first optical signal when emitting an object; a driving circuit configured to drive the lighting element; a photoelectric conversion circuit configured to generate a first optical current in accordance with the second optical signal; and a programmable current amplifier circuit configured to sample and hold the first optical current when the lighting element is in operation, and to generate a second optical current when the lighting element is out of operation in one detection period, where the second optical current lasts for at least one working period in the detection period, and where the second optical current represents the first optical current.

Abstract: A battery balance circuit configured for a battery apparatus having two batteries coupled in series, can include: first and second capacitors respectively coupled to two terminals of the two batteries; first and second switching circuits respectively coupled to the two terminals of the two batteries, where the first and second switching circuits are configured to control charging or discharging of each of the two batteries; a third capacitor coupled between the first and second switching circuits, where the third capacitor is configured to store or release energy in order to balance battery levels between the two batteries; and parasitic inductors, where the third capacitor and the parasitic inductors are configured to resonate, and the first and second switching circuits are configured to operate at a resonance frequency.

Abstract: Controlling a switching power supply can include: generating a ramp signal having an amplitude that follows an output feedback signal of the switching power supply; and controlling a switching state of a main power transistor in the switching power supply to be switched when the ramp signal reaches a peak value such that an output signal of the switching power supply is maintained as substantially constant.

Abstract: A voltage regulation circuit can include: a power stage circuit with a single inductor and a plurality of output circuits; each output circuit having an output control switch configured to control a duration of an on time of the output circuit, and an output switch control circuit configured to control the output control switch in accordance with an output voltage sampling signal, a reference current signal that represents an output current of the output circuit, and a clock signal, in order to maintain an output voltage of the output circuit as constant and to decrease interference from load variations of any other of the plurality of output circuits; and where the output control switches are controlled to be on in sequence in each switching period.

Abstract: The present disclosure relates to a driving circuit and a wireless power transmitter including the same. N+1 half-bridge circuits constitute N full-bridge circuits by reusing the half-bridge circuits, so as to drive a plurality of coils for wirelessly charging a plurality of loads.

Abstract: The present disclosure relates to a power transmitter, a resonance-type contactless power supply and a control method. The inverter circuit is controlled to provide a high-frequency AC current with a voltage strength parameter so that a current strength parameter (e.g. a peak value or an effective value of the current) of the AC current flowing through a transmitting coil and that through a receiving coil have a predetermined relationship. Thus, an equivalent load impedance is adjusted so that the system efficiency is optimized.

Abstract: The present disclosure relates to a method for manufacturing a CM OS structure. Shallow trench isolation is formed in a semiconductor substrate. A first region is defined for a first MOSFET and a second MOSFET of a first type and a second region is defined for a third MOSFET and a fourth MOSFET of a second type, by shallow trench isolation. First to fourth Gates sacks are formed on the semiconductor substrate, each of which includes a gate conductor and a gate dielectric and the gate dielectric is disposed between the gate conductor and the semiconductor substrate. The first and second gate stacks are formed in the first region, and the third and fourth gate stacks are formed in the second region. The gate dielectrics of the first and third gate stacks have a first thickness, and the gate dielectrics of the second and fourth gate stacks have a second thickness larger than the first thickness. Some masks are commonly used in various steps in this process so that the number of the masks is reduced.

Abstract: A package structure and a method for manufacturing the same are disclosed. The package structure includes a first plastic body which covers a first light sensor and a light emitter, and a second plastic body which is made of infrared cutoff materials and fills inner pins of a lead frame or is formed below the lead frame. A trench is formed in the first plastic body so that a light-blocking layer is located on a side surface of the first plastic body. The second plastic body and the light-blocking layer are used to avoid influence of infrared light on a first light sensor.

Abstract: Disclosed is an LED driver adapted to an electronic transformer, where the LED driver can ensure that the electronic transformer meets minimum load current requirements, and operates during an entire AC period by clamping the minimum inductor current. By controlling the LED load current through a current stabilization control circuit, the LED load can operate with relatively high control accuracy and fast response speed. In addition, the LED driver can match various electronic transformers based on traditional circuit structures, and the LED load can operate without flicking.

Abstract: A control circuit for an LED driving circuit having a rectifier and a power transistor for driving an LED load, can include: a control signal regulation circuit configured to control a driving voltage of the power transistor to vary with a rectifier output voltage to control the variation of a current flowing through the power transistor to be consistent with that of the rectifier output voltage to decrease a power loss of the power transistor; and the control signal regulation circuit being configured to control the driving voltage of the power transistor to vary with the rectifier output voltage to control the variation of the current flowing through the power transistor to be opposite to that of the rectifier output voltage to improve a power factor of the LED driving circuit.

Abstract: A package structure can include: (i) a substrate having opposite first and second surfaces; (ii) a die having opposite active and back surfaces, where the die is arranged above the first surface of the substrate, the back surface of the die is adjacent to the first surface of the substrate; (iii) pads arranged on the active surface of the die; (iv) a first encapsulator configured to encapsulate the die; (v) an interconnection structure configured to electrically connect to the pads through the first encapsulator; (vi) a second encapsulator configured to encapsulate the interconnection structure; and (vii) a redistribution structure configured to electrically connect to the interconnection structure and to provide external electrical connectivity.

Abstract: A control circuit can include: a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter; a sampling time control circuit configured to generate a sampling time control signal according to the blanking control signal and a feedback voltage signal; and a voltage detection circuit configured to receive the feedback voltage signal and the sampling time control signal, and to determine the time of detecting the feedback voltage signal according to the sampling time control signal to obtain a detection signal for controlling the main switch, where the voltage detection circuit stops detecting the feedback voltage signal when the blanking control signal is active, and the period during which the blanking control signal is active is adjustable along with the peak current.

Abstract: An LED driving circuit configured to drive an LED lamp having first and second loads, can include: a power converter; a dimmer configured to control the power converter to output a driving current to the LED lamp; and a current distribution circuit configured to adjust a proportion of current from the driving current that flows through each of the first and second loads of the LED lamp, in order to adjust the color temperature or the brightness of the LED lamp.

Abstract: The disclosure relates to a flyback converter, a control circuit and a control method therefor. In the control method, a power stage circuit is controlled at a light load to operate alternatively in a pulse width modulation mode (i.e. a constant switching frequency mode) and in a constant on time mode, in accordance with a voltage compensation signal. Thus, output energy may decrease rapidly and smoothly, without need for the control circuit to stop working. The flyback converter has increased efficiency at the light load and decreased output voltage ripple.