Abstract:
A power supply comprises at least one power switch adapted to convey power between input and output terminals of the power supply, and a digital controller adapted to control operation of the at least one power switch responsive to an output measurement of the power supply. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a voltage difference between the output measurement and a reference value, a digital filter providing a digital control output based on a sum of previous error signals and previous control outputs, an error controller adapted to modify operation of the digital filter upon an error condition, and a digital pulse width modulator providing a control signal to the power switch having a pulse width corresponding to the digital control output. The analog-to-digital converter further comprises a windowed flash analog-to-digital converter having a transfer function defining a relationship between the voltage difference and corresponding digital values. The transfer function provides a substantially linear region at a center of a corresponding error window, including a first step size in the center of the error window and at least one other step size in a peripheral region of the error window that is larger than the first step size. The first step size and the other step sizes may each reflect a linear relationship between the voltage difference and the corresponding digital values. Alternatively, the first step size reflects a linear relationship between the voltage difference and the corresponding digital values, and the other step sizes each reflect a non-linear relationship between the voltage difference and the corresponding digital values.
Abstract:
A power supply comprises at least one power switch adapted to convey power between input and output terminals of the power supply, and a digital controller adapted to control operation of the at least one power switch responsive to an output measurement of the power supply. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a voltage difference between the output measurement and a reference value, a digital filter providing a digital control output based on a sum of previous error signals and previous control outputs, an error controller adapted to modify operation of the digital filter upon an error condition, and a digital pulse width modulator providing a control signal to the power switch having a pulse width corresponding to the digital control output. The analog-to-digital converter further comprises a windowed flash analog-to-digital converter having a transfer function defining a relationship between the voltage difference and corresponding digital values. The transfer function provides a substantially linear region at a center of a corresponding error window, including a first step size in the center of the error window and at least one other step size in a peripheral region of the error window that is larger than the first step size. The first step size and the other step sizes may each reflect a linear relationship between the voltage difference and the corresponding digital values. Alternatively, the first step size reflects a linear relationship between the voltage difference and the corresponding digital values, and the other step sizes each reflect a non-linear relationship between the voltage difference and the corresponding digital values.
Abstract:
A system and method is provided for utilizing output-timing data to control at least one output timing parameter of a point-of-load (“POL”) regulator. Specifically, a power supply controller (“controller”) is adapted to transmit output-timing data to at least one POL regulator. In one embodiment of the present invention, each POL regulator includes an output builder, a control unit and a storage device. The control unit is adapted to store the output-timing data in the storage device. The control unit and the output builder are then adapted to produce an output having at least one output timing parameter in accordance with the output-timing data. Examples of output-timing data include sequencing data, turn-on data, turn-off data, termination data, slew-rate data, etc. For example, a POL regulator may be adapted to utilize output-timing data, or a portion thereof (e.g., slew-rate data), to generate an output having a particular slew rate. Similarly, a POL regulator may be adapted to utilize output-timing data, or a portion thereof (e.g., sequencing data, turn-on data, etc.), to determine (or calculate) a period of time to wait (e.g., delay period) before the output is generated. In other words, output-timing data can be used to produce a series of outputs in a particular order, or sequence.
Abstract:
A pulse width modulation system for use in a switching power supply circuit provides high-resolution pulse width modulated signals. The pulse width modulation system is configured to receive a control signal comprising a (m+n)-bit binary word and to provide a pulse width modulated signal with a predetermined average duty cycle having a resolution of substantially 2−(m+n). The pulse width modulation system includes a timing circuit for providing 2m timing signals, a dithering circuit, and a signal generator. Upon receiving the control signal, the dithering circuit is configured to provide a modified control signal, which comprises a series of up to 2n m-bit binary words. The signal generator is configured to receive the timing signals and the modified control signal and to provide the pulse width modulated signal having a duty cycle, which, when averaged over 2n timing cycles, is approximately equal to the predetermined average duty cycle. The pulse width modulated signal is used by a switching power supply circuit to control at least one power switching device.
Abstract:
A switched mode power supply comprises at least one power switch adapted to convey power between input and output terminals of the power supply, and a digital controller adapted to control operation of the at least one power switch responsive to an output parameter of the power supply. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a difference between the output parameter and a reference value, a digital filter providing a digital control output based on a sum of current and previous error signals and previous control outputs, the error signals comprising integers having a relatively low numerical range and said control outputs comprising integers having a relatively high numerical range, and a digital pulse width modulator providing a control signal to the power switch having a pulse width corresponding to the digital control output. The digital filter further comprises an asymmetric arithmetic unit adapted to combine the low range integers with the high range integers.
Abstract:
A method and apparatus for sharing current among a plurality of power modules is provided. The method includes sensing of a characteristic of an output power signal of at least one of the plurality of power modules and providing a first signal having a pulse width corresponding to the sensed characteristic. The first signal is imparted onto a current share bus coupled to each of the plurality of power modules if the first signal has a pulse width greater than corresponding first signals of other power modules coupled to the current share bus, whereupon one of the first signals from the plurality of power modules having greatest pulse width is imparted onto the current share bus as a second signal. A phase difference between the first signal and the second signal is detected and a feedback signal is provided to the at least one power module in response to the detected phase difference. The feedback signal thereby controls the at least one power module to regulate the output power signal.
Abstract:
The invention relates to a multi-layer planar inductance coil on a portion of a first plate-shaped support (10) which has a plurality of first conducting layers (14) which extend substantially parallel to each other and which is designed for holding and contacting further electronic components (32), wherein at least one conducting layer (14) of the first support, which forms a first electrical winding, is arranged for co-operation with a core (24) which is provided for guiding a magnetic flux and which is to be arranged in the portion, wherein at least one second plate-shaped support (20; 22; 44; 54) with a plurality of second conducting layers (16; 18) which extend substantially parallel to each other is so arranged in the portion parallel to the first support (10) that at least one conducting layer (16) of the second support, which provides a second electrical winding, can inductively co-operate with the core (24) and the first electrical winding.
Abstract:
A system and method are provided for bidirectional communications between a master device and one or more slave devices. Each slave device is coupled to first and second opto-isolators which are effective to provide galvanic isolation of the slave device from the master device. An encoder circuit is coupled between the master device and the first opto-isolators. A decoder circuit is coupled between the master device and the second opto-isolators. The master device generates transmissions to the slave devices along a first low logic path including the encoder and the first opto-isolators, wherein the decoder and the second opto-isolators are non-responsive to signals on the first path. The slave devices generate transmissions to the master device along a second low logic path including the second opto-isolators and the decoder, wherein the encoder and the first opto-isolators are non-responsive to signals on the second path.
Abstract:
A power subsystem is actively optimized to improve total subsystem efficiency in a way that is responsive to changes in load requirements, power supply variations, and subsystem temperature variations. Detailed, multidimensional power loss models are developed for constituent devices which are then combined into a power subsystem containing a controller and circuity for measuring device operating parameters such as input and output voltage, output current, and temperature. Operating parameters are continually monitored, and set points are correspondingly changed based on the detailed power loss models to achieve maximum overall efficiency for the instantaneous operating state of the system.
Abstract:
A method and system is provided for optimizing the digital filter compensation coefficients of a digitally controlled switched mode power supply within a distributed power system. A power control system comprises at least one point-of-load (POL) regulator having a power conversion circuit adapted to convey power to a load and a digital controller coupled to the power conversion circuit though a feedback loop. The digital controller is adapted to provide a pulse width modulated control signal to the power switch responsive to a feedback measurement of an output of the power conversion circuit. The digital controller further comprises a digital filter having a transfer function defined by plural filter coefficients. The digital controller periodically stores a successive one of a plurality of samples of the feedback measurement. A serial data bus operatively connects the POL regulator to a system controller. The system controller retrieves each successive stored sample from the digital controller via the serial data bus. After retrieving a pre-determined number of the samples, the system controller calculates optimized filter coefficients for the digital filter and communicates the optimized filter coefficients to the digital controller. The digital controller thereafter uses the optimized filter coefficients in the digital filter.