Abstract:
PROBLEM TO BE SOLVED: To provide a power supply device that reconciles suppressed EMI noise and a reduced output voltage ripple.SOLUTION: In the power supply device, a switching control device 101 for controlling switching elements with a pulse control signal includes a PPM circuit 107 for modulating pulse position, a PWM circuit 106 for modulating pulse width, and a pulse generation circuit 109 for generating a pulse modulated by the PPM circuit 107 and the PWM circuit 106. When pulses subjected to pulse position modulation by the PPM circuit 107 have coarser pulse intervals than before modulation, the PWM circuit 106 lengthens the pulse width. When the pulses subjected to pulse position modulation by the PPM circuit 107 have closer pulse intervals than before modulation, on the other hand, the PWM circuit 106 shortens the pulse width.
Abstract:
PROBLEM TO BE SOLVED: To provide a MOSFET switch suitable for use as a synchronous rectifier in a power converter.SOLUTION: An N-channel power MOSFET with its source and body connected together and biased at a high positive voltage with respect to its drain is fabricated. A gate is controlled by a switch (1184) which selectively connects the gate to the source or to a voltage (VCP) enough to turn a channel of the MOSFET fully on. When the gate is connected to the source, the device functions as a "pseudo-Schottky" diode which turns on at a lower voltage and has a lower conductor resistance than a conventional PN junction. When the gate is connected to the positive voltage the channel of the MOSFET is turned fully on. This MOSFET switch reduces power loss and stored charge in the "break-before-make" time.
Abstract:
PROBLEM TO BE SOLVED: To provide a power-efficient DC-DC converter.SOLUTION: The DC-DC converter includes a low side switch Q2 connected in series with a high side switch Q1, a high side control circuit 6, and a low side control circuit 7. The high side control circuit 6 turns on or off and PWM-controls the high side switch Q1. The low side control circuit 7 has a first detection circuit 3 for detecting a current through the low side switch Q2, and an offset cancellation circuit 14 for holding an output of the first detection circuit 3 as an offset voltage when the low side switch Q2 is off, and outputting a value resulting from the subtraction of the offset voltage from an output of the first detection circuit 3 when the low side switch Q2 is on. The low side control circuit 7 turns on the low side switch Q2 when the high side switch Q1 is off, and turns off the low side switch Q2 by comparing an output voltage of the offset cancellation circuit 14 with a reference voltage.
Abstract:
PROBLEM TO BE SOLVED: To provide a comparator that has new output logic.SOLUTION: A comparator 100 compares an input voltage Vwith a reference voltage V. A differential amplification circuit 10 comprises: a first input transistor Mi1 having a control terminal with the reference voltage Vapplied; and a second input transistor Mi2 having a control terminal with the input voltage Vapplied. An output stage 20 receives an output signal Vof the differential amplification circuit 10 to output a corresponding signal as an output signal Sindicative of the result of comparison. A feedback circuit 30 receives the output signal Sof the output stage 20, and if the output signal Stransitions from a first level to a second level, feeds it back to the differential amplification circuit 10 or the output stage 20 to return the output signal Sto the first level.
Abstract translation:要解决的问题:提供具有新输出逻辑的比较器。
解决方案:比较器100将输入电压V IN SB>与参考电压V REF SB>进行比较。 差分放大电路10包括:具有施加参考电压V REF SB>的控制端子的第一输入晶体管Mi1; 并且施加具有输入电压V IN SB>的控制端子的第二输入晶体管Mi2。 输出级20接收差分放大电路10的输出信号V x“,输出相应的信号作为输出信号S OUT SB >表示比较结果。 反馈电路30接收输出级20的输出信号S OUT SB>,如果输出信号S OUT SB>从a 第一电平到第二电平,将其馈送到差分放大电路10或输出级20,以将输出信号S OUT SB>返回到第一电平。 版权所有(C)2012,JPO&INPIT