Abstract: A reception antenna includes a reception coil which receives a power signal. A rectification circuit rectifies an alternating current flowing to the reception antenna. A smoothing capacitor smoothes an output of the rectification circuit. A waveform stabilizer is enabled when a power receiver satisfies a predetermined condition and shifts a parallel resonance frequency of the reception antenna.

Abstract: A wireless power receiver circuit forms a wireless power receiving apparatus together with a reception coil. An internal power supply line is connected to a capacitor C. An output line is connected to a secondary battery. An H-bridge circuit includes N-channel MOSFETs MH1, MH2, ML1, and ML2. A first switch is arranged between a rectification line and the internal power supply line. A second switch is arranged between the rectification line and the output line. A voltage VDD of the internal power supply line is supplied to a power supply terminal of a controller.

Abstract: A power receiving apparatus is configured including a control circuit together with a reception coil, a rectifier circuit, a smoothing capacitor, and a modulator. A received power calculation unit calculates an electric power consumption PD of the wireless power receiving apparatus based on a predetermined calculation expression. A parameter acquisition unit acquires a first parameter ? and a second parameter ? via an external component. A correction unit calculates a received electric power PRP of the wireless power receiving apparatus according to a correction expression PRP=?×PD+?.

Abstract: A control circuit is provided for a power receiver apparatus. A target voltage range setting unit sets an upper limit voltage VH and a lower limit voltage VL that define a target voltage range REF to be set for a rectified voltage VRECT that develops across a smoothing capacitor. An electric power control unit compares the rectified voltage VRECT with each of the upper limit voltage VH and the lower limit voltage VL, and generates a power control signal DPC based on the comparison result. A modulator modulates the power control signal DPC, and transmits the modulated signal to a wireless power transmitter apparatus via a reception coil. Upon detection of an oscillation state in the rectified voltage VRECT, the target voltage range setting unit expands the target voltage range REF.

Abstract: A rectifier circuit is coupled to a reception coil, and generates a rectified voltage. A charger circuit receives the rectified voltage, and charges a secondary battery. A modulator coupled to the reception coil modulates a voltage or a current applied to the reception coil based on a control value, and transmits a control packet including the control value to a wireless power transmitter. A charging control unit controls a charging current supplied from the charger circuit to the secondary battery. A power control unit generates a control error value indicating a power transmission rate for the wireless power transmitter, based on the difference between the present rectified voltage and its target value, and outputs the control error value as the control value to the modulator. When the absolute value of the difference is smaller than a predetermined threshold value, the charging control unit changes the charging current.

Abstract: A control circuit of a wireless power receiver where the wireless power receiver includes a reception coil, a rectification circuit that rectifies a current of the reception coil, and a smoothing capacitor connected to an output of the rectification circuit. The control circuit includes a frequency detecting part configured to determine a frequency of a signal received by the reception coil in a detection period after a lapse of predetermined first time from a predetermined start timing before a lapse of predetermined second time; a modulation detecting part configured to determine whether the signal received by the reception coil is subjected to FSK (Frequency Shift Keying); and a standard determining part configured to determine a standard that a wireless power transmitter complies with, depending on the frequency detected by the frequency detecting part and the presence or absence of FSK.

Abstract: A power receiving control circuit is provided that receives AC coil current IRX from a reception coil and that supplies DC output voltage VOUT. A rectifier circuit rectifies the coil current IRX. A linear regulator receives a rectified voltage VRECT across a smoothing capacitor, and generates the output voltage VOUT stabilized to a predetermined target level. A controller has predetermined control characteristics configured as a relation between the value of a charging current ICHG and the target value of the rectified voltage VRECT. The controller detects the value of the charging current ICHG, and transmits information which indicates electric power to be transmitted from a wireless power supply apparatus, with reference to the control characteristics. The controller is configured to be capable of changing the control characteristics.

Abstract: A wireless power receiver circuit forms a wireless power receiving apparatus together with a reception coil. An internal power supply line is connected to a capacitor C. An output line is connected to a secondary battery. An H-bridge circuit includes N-channel MOSFETs MH1, MH2, ML1, and ML2. A first switch is arranged between a rectification line and the internal power supply line. A second switch is arranged between the rectification line and the output line. A voltage VDD of the internal power supply line is supplied to a power supply terminal of a controller.

Abstract: A rectifier circuit rectifies a current that flows through a reception coil. A smoothing capacitor is connected to the output of the rectifier circuit. A judgment unit generates a notification signal that corresponds to a comparison result obtained by comparing the voltage VRECT across the smoothing capacitor with a predetermined threshold voltage at a judgment timing. The judgment timing is positioned after the start of reception of a signal from a power supply apparatus.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string to be intermittently driven. In the on period of the LED string, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a detection voltage VLED that corresponds to the output voltage Vout of the switching power supply matches a predetermined reference voltage Vref. A driver drives a switching transistor included in the switching power supply according to the pulse signal. After transition from the on period to the off period, the pulse modulator reduces the duty ratio of the pulse signal over time.

Abstract: A soft-start circuit generates a soft-start voltage Vss having a voltage level that rises over time. A pulse width modulator generates a PWM signal having a duty ratio adjusted such that a feedback voltage Vout? that corresponds to the output voltage Vout of the switching power supply matches the soft-start voltage Vss. A driver circuit controls a switching element according to the PWM signal. A capacitor is arranged such that one terminal thereof is set to a fixed electric potential. A current source generates a charge current that flows intermittently in synchronization with the PWM signal so as to charge the capacitor. The soft-start circuit outputs, as the soft-start voltage Vss, a voltage that occurs at the capacitor.

Abstract: The present disclosure provides a driving circuit of a light emitting element including a switching power source for supplying a driving voltage to a first terminal of the light emitting element to be driven and a current driver connected to a second terminal of the light emitting element for supplying a driving current to the light emitting element while a burst dimming pulse is being asserted.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.

Abstract: The present disclosure provides a driving circuit of a light emitting element including a switching power source for supplying a driving voltage to a first terminal of the light emitting element to be driven and a current driver connected to a second terminal of the light emitting element for supplying a driving current to the light emitting element while a burst dimming pulse is being asserted.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string to be intermittently driven. In the on period of the LED string, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a detection voltage VLED that corresponds to the output voltage Vout of the switching power supply matches a predetermined reference voltage Vref. A driver drives a switching transistor included in the switching power supply according to the pulse signal. After transition from the on period to the off period, the pulse modulator reduces the duty ratio of the pulse signal over time.

Abstract: A soft-start circuit generates a soft-start voltage Vss having a voltage level that rises over time. A pulse width modulator generates a PWM signal having a duty ratio adjusted such that a feedback voltage Vout? that corresponds to the output voltage Vout of the switching power supply matches the soft-start voltage Vss. A driver circuit controls a switching element according to the PWM signal. A capacitor is arranged such that one terminal thereof is set to a fixed electric potential. A current source generates a charge current that flows intermittently in synchronization with the PWM signal so as to charge the capacitor. The soft-start circuit outputs, as the soft-start voltage Vss, a voltage that occurs at the capacitor.

Abstract: A control IC controls a switching power supply configured to supply a driving voltage Vout to one terminal of an LED string which is driven in an intermittent manner. A sample-and-hold circuit performs sampling of a detection voltage Vs that corresponds to a driving voltage Vout in the on period, and holds the sampled detection voltage Vs in the off period. In the off period, a pulse modulator generates a pulse signal having a duty ratio adjusted such that a hold detection voltage VsH output from the sample-and-hold circuit matches the detection voltage Vs. A driver drives a switching transistor according to the pulse signal.

Abstract: A first switch group includes switches provided on a path for charging a flying capacitor using an input voltage. A second switch group includes switches provided on a path for charging an output capacitor using charge stored in the flying capacitor. A pulse modulator generates a pulse signal having a duty ratio adjusted so that a feedback voltage corresponding to an output voltage of a charge pump circuit matches a given reference voltage. A driver receives the pulse signal from the pulse modulator, and turns on either one of the first switch group and the second switch group during a period corresponding to a high-time of the pulse signal and turns on the other switch group during a period corresponding to a low-time thereof.

Abstract: In a switching power supply apparatus, an input voltage Vin applied to an input terminal is output from a first output terminal and a second output terminal after boosting or inverting of the voltage Vin. When a first and a fourth switches are turned on, a flying capacitor is charged. When a second and a fifth switches are turned on, charges charged in the flying capacitor are transferred to a first output capacitor. When a third and a fifth switches are turned on, charges charged in the flying capacitor are transferred to a second output capacitor. A voltage Vin×2 double the input voltage Vin is output from the first output terminal as a first output voltage Vout1, and a voltage ?Vin obtained by inverting the input voltage is output from the second output terminal as a second output voltage.

Abstract: A charge pump circuit includes a first switch to a fourth switch, a flying capacitor, and an output capacitor. A driver turns on the first switch and the fourth switch during a predetermined precharge period from the start of activation of the charge pump circuit to charge the output capacitor. Thereafter, on the basis of a pulse signal, the driver alternately turns on and off a first pair and a second pair.