摘要:
A voltage converter includes a plurality of voltage converter circuits, each voltage converter circuit having a topology, and a control circuit coupled to the voltage converter circuits. The control circuit is operable to select one of the voltage converter circuits to provide an output power on an output node. The control circuit selects one of the voltage converter circuits in response to a parameter associated with the operation of the voltage converter, such as a parameter associated with the output power on the output node.
摘要:
An embodiment of a hysteretic power-supply controller includes a signal generator, frequency adjuster, and signal combiner. The signal generator is operable to generate a switching signal having a first level in response to a control signal being greater than a first reference value and having a second level in response to the control signal being less than a second reference value, the switching signal having an actual frequency and being operable to drive a switching stage that generates a regulated output signal. The frequency adjuster is operable to generate a frequency-adjust signal that is related to a difference between the actual frequency and a desired frequency. And the signal combiner is operable to generate the control signal from the frequency-adjust signal and the regulated output signal. Such a hysteretic power-supply controller may allow one to set the switching frequency to a desired value independently of the parameters of the power supply.
摘要:
A multiphase sliding-mode switching power supply (24) and a method of operating the power supply (24) are provided. A switch (30) for each phase (28) is coupled to a bipolar power source (22), with each switch (30) effecting one phase (28). An inductance (32) is coupled to each switch (30), and a capacitance (36) is coupled to the inductances (32). A load (26) is coupled across the capacitance (36). A sliding-surface generator (78) is coupled to the monitor circuit (38) and generates a single sliding surface (σ) for all phases (28). A translation circuit (102) is coupled to the sliding-surface generator (78) and configured to translate the sliding surface (σ) into a stream of switching pulses (86). A transient control (52) is coupled to the translation circuit (102) and configured to adjust said stream of switching pulses upon detection of an out-of-range transient. A switching circuit (138) is coupled to the switches (30) and the transient control (52), and switches the switches (30) in response to the stream of switching pulses (86).
摘要:
A sliding-mode switching power supply (24) having N phases (28) and a method of operating the power supply (24) are provided. N switches (30) are coupled to a bipolar power source (22), with each switch (30) effecting one phase (28). An inductance (32) is coupled to each switch (30), and a capacitance (36) is coupled to the inductances (32). A load (26) is coupled across the capacitance (36). A monitor circuit (38) is coupled to the inductances (32) and the capacitance (36) and configured to monitor currents (IL) through the inductances (32) and/or a voltage (VC) across the capacitance (36). A sliding-surface generator (78) is coupled to the monitor circuit (38) and generates a single sliding surface (σ) for all phases (28). A constant-frequency control (104) forms a variable window (Δσ) for the sliding surface (σ). A switching circuit (138) switches the switches (30) at a switching frequency (fS) determined by the variable window (Δσ). The constant-frequency control (104) adjusts the variable window (Δσ) to maintain the switching frequency (fS) substantially constant.
摘要翻译:提供具有N相(28)的滑动模式开关电源(24)和操作电源(24)的方法。 N个开关(30)耦合到双极电源(22),每个开关(30)实现一个相位(28)。 电感(32)耦合到每个开关(30),并且电容(36)耦合到电感(32)。 负载(26)跨过电容(36)耦合。 监视器电路(38)耦合到电感(32)和电容(36),并被配置为通过电感(32)和/或电压(V')来监测电流(I SUB) 跨过电容(36)。 滑动表面发生器(78)耦合到监视器电路(38)并为所有相(28)产生单个滑动表面(sigma)。 恒定频率控制(104)形成用于滑动表面(sigma)的可变窗口(Deltasigma)。 开关电路(138)以由可变窗口(Deltasigma)确定的开关频率(f S S S S S)切换开关(30)。 恒定频率控制(104)调节可变窗口(Deltasigma)以维持开关频率(f SUB S S S)基本上恒定。
摘要:
A sliding-mode switching power supply (24) having N phases (28) and a method of operating the power supply (24) are provided. N switches (30) are coupled to a bipolar power source (22), with each switch (30) effecting one phase (28). An inductance (32) is coupled to each switch (30), and a capacitance (36) is coupled to the inductances (32). A load (26) is coupled across the capacitance (36). A monitor circuit (38) is coupled to the inductances (32) and the capacitance (36) and configured to monitor currents (IL) through the inductances (32) and/or a voltage (VC) across the capacitance (36). A sliding-surface generator (78) is coupled to the monitor circuit (38) and generates a single sliding surface (σ) for all phases (28). A constant-frequency control (104) forms a variable window (Δσ) for the sliding surface (σ). A switching circuit (138) switches the switches (30) at a switching frequency (fS) determined by the variable window (Δσ). The constant-frequency control (104) adjusts the variable window (Δσ) to maintain the switching frequency (fS) substantially constant.
摘要翻译:提供具有N相(28)的滑动模式开关电源(24)和操作电源(24)的方法。 N个开关(30)耦合到双极电源(22),每个开关(30)实现一个相位(28)。 电感(32)耦合到每个开关(30),并且电容(36)耦合到电感(32)。 负载(26)跨过电容(36)耦合。 监视器电路(38)耦合到电感(32)和电容(36),并被配置为通过电感(32)和/或电压(V')来监测电流(I SUB) 跨过电容(36)。 滑动表面发生器(78)耦合到监视器电路(38)并为所有相(28)产生单个滑动表面(sigma)。 恒定频率控制(104)形成用于滑动表面(sigma)的可变窗口(Deltasigma)。 开关电路(138)以由可变窗口(Deltasigma)确定的开关频率(f S S S S S)切换开关(30)。 恒定频率控制(104)调节可变窗口(Deltasigma)以维持开关频率(f SUB S S S)基本上恒定。
摘要:
A multiphase DC-to-DC converter includes at least two phase circuits each having upper and lower power switches and a front-end inductor that is operative for forming a resonant tank circuit with the phase circuits to ensure zero voltage switching and minimizing power losses.
摘要:
A linear predictive system for a DC-DC converter including a linear predictive controller, first and second adders and a multiplier. The DC-DC converter generates an output signal and includes a digital compensation block that converts a feedback error signal into a main duty cycle signal. The linear predictive controller predicts linear changes of the main duty cycle signal in response to changes of the output signal and provides a predictive duty cycle signal. The first adder subtracts the predictive duty cycle signal from the main duty cycle signal to provide a duty cycle delta. The multiplier multiplies the duty cycle delta by a gain factor to provide a duty cycle delta sample. The second adder adds the duty cycle delta sample to the first duty cycle signal to generate an adjusted duty cycle signal. The linear predictive controller performs an inverse function of DC-DC conversion approximated to the first order
摘要:
A DC-DC converter has an output bus coupled to power a load. A voltage transient compensation circuit has a first switch between a voltage input bus and the output bus, and a second switch between the output bus and a flyback transformer coupled to a reference voltage terminal. When the voltage on the output bus drops below a first threshold, the first switch couples and thereby transfers energy from the voltage input bus to the voltage output bus and the load. When the voltage on the output bus exceeds a second threshold, the second switch is closed, transferring energy from the output bus to an input winding of the flyback transformer. When the voltage on the output bus drops back in a range between the two thresholds, the second switch is opened, and the flyback transformer transfers stored energy back to the voltage input bus.