An apparatus for charging a battery of a user device includes a charge pump that converts an input voltage, received from a power adapter, to a system voltage that is less than the input voltage based on a ratio of the charge pump, a regulator coupled between the system voltage output by the charge pump and a battery of the user device, the regulator configured to control a battery charging voltage applied to the battery of the user device and to provide isolation between the system voltage that is applied to one or more components of the user device and the battery charging voltage applied to charge the battery of the user device, and a controller configured to determine a difference between the system voltage applied to an input of the regulator and the charging voltage output by the regulator.

An integrated circuit includes a first amplifier and a second amplifier. A first impedance matching circuit is coupled to the first amplifier, a first charge pump, and a single MEMS transducer. A second impedance matching circuit is coupled to the second amplifier, a second charge pump, and to the single MEMS transducer. A first capacitive load as measured at an input of first amplifier, and a second capacitive load as measured at an input of the second amplifier exist. The first capacitive load and the second capacitive load are balanced with respect to each other. A single pressure change causes the single MEMS transducer to create a first electrical signal and a second electrical signal. Both the first electrical signal and the second electrical signal are matched or approximately matched in magnitude, and 180 degrees or approximately 180 degrees out of phase with respect to each other.

An integrated circuit includes a first amplifier and a second amplifier. A first impedance matching circuit is coupled to the first amplifier, a first charge pump, and a single MEMS transducer. A second impedance matching circuit is coupled to the second amplifier, a second charge pump, and to the single MEMS transducer. A first capacitive load as measured at an input of first amplifier, and a second capacitive load as measured at an input of the second amplifier exist. The first capacitive load and the second capacitive load are balanced with respect to each other. A single pressure change causes the single MEMS transducer to create a first electrical signal and a second electrical signal. Both the first electrical signal and the second electrical signal are matched or approximately matched in magnitude, and 180 degrees or approximately 180 degrees out of phase with respect to each other.

An apparatus and a method for range extension for a combined data and power line are provided. Further, a bus system is provided. The design is based on a supply voltage that is transmitted via the combined data and power line being refreshed by a charge pump. Further, there may be provision, by way of example, for a data signal that is transmitted via the combined data and power line to be re-freshed using the likewise transmitted supply voltage.

An apparatus and a method for range extension for a combined data and power line are provided. Further, a bus system is provided. The design is based on a supply voltage that is transmitted via the combined data and power line being refreshed by a charge pump. Further, there may be provision, by way of example, for a data signal that is transmitted via the combined data and power line to be re-freshed using the likewise transmitted supply voltage.

Representative implementations of devices and techniques may minimize switching losses and voltage ripple in a switched capacitor de-de converter. A digital controller is used to control switching, based on an existing load. In some examples, the digital controller may insert a dead-time phase in a switching period, which may reduce voltage ripple for a low output load current. In other examples, the digital controller may adjust the conductance of a plurality of sub-switches, where the plurality of sub-switches may include one or more sub-switches that have a higher on-resistance than other sub-switches. For example, a sub-switch may have an on-resistance that is a multiple of the on-resistance of other sub-switches.

Representative implementations of devices and techniques may minimize switching losses and voltage ripple in a switched capacitor de-de converter. A digital controller is used to control switching, based on an existing load. In some examples, the digital controller may insert a dead-time phase in a switching period, which may reduce voltage ripple for a low output load current. In other examples, the digital controller may adjust the conductance of a plurality of sub-switches, where the plurality of sub-switches may include one or more sub-switches that have a higher on-resistance than other sub-switches. For example, a sub-switch may have an on-resistance that is a multiple of the on-resistance of other sub-switches.

A switched current source circuit, comprising first and second voltage source nodes; a load; a current source; and capacitor switching circuitry comprising a load node, a capacitor and a plurality of switches configured, based on a control signal, to adopt a biasing configuration followed by an active configuration, wherein in the biasing configuration, the load node is conductively connected to the second voltage source node to bias a voltage level at the load node, and the capacitor is connected so that it at least partly charges; and in the active configuration, the load node is conductively connected via the load to the first voltage source node, and via the capacitor to the current source to increase a potential difference between the first voltage source node and the load node.

Embodiments of the present disclosure provide a buck and rectifier circuit, a wireless charging receiver chip, and a wireless charging receiver. The buck and rectifier circuit includes a rectifier module, a charge pump module, a filter unit, and a control unit. The rectifier module includes a first bridge arm unit and a second bridge arm unit, wherein the first bridge arm unit is connected to a non-inverting output terminal of an alternating current signal, and the second bridge arm unit is connected to an inverting output terminal of the alternating current signal. The charge pump module includes a first voltage converter unit and a second voltage converter unit, wherein the first voltage converter unit is connected in parallel to the second voltage converter unit. The control unit is configured to output a first pulse width modulation signal to control on or off of a switch transistor in the rectifier module, and output a second pulse width modulation signal to control on or off of a switch transistor in the charge pump module, such that an operating frequency of the charge pump module is a positive integer multiple of the frequency of the alternating current signal. According to the above method, power conversion efficiency during wireless charging may be improved.

Embodiments of the present disclosure provide a buck and rectifier circuit, a wireless charging receiver chip, and a wireless charging receiver. The buck and rectifier circuit includes a rectifier module, a charge pump module, a filter unit, and a control unit. The rectifier module includes a first bridge arm unit and a second bridge arm unit, wherein the first bridge arm unit is connected to a non-inverting output terminal of an alternating current signal, and the second bridge arm unit is connected to an inverting output terminal of the alternating current signal. The charge pump module includes a first voltage converter unit and a second voltage converter unit, wherein the first voltage converter unit is connected in parallel to the second voltage converter unit. The control unit is configured to output a first pulse width modulation signal to control on or off of a switch transistor in the rectifier module, and output a second pulse width modulation signal to control on or off of a switch transistor in the charge pump module, such that an operating frequency of the charge pump module is a positive integer multiple of the frequency of the alternating current signal. According to the above method, power conversion efficiency during wireless charging may be improved.