Constant current power supply apparatus
申请公布号:US9013899(B2)
申请号:US201213397489
申请日期:2012.02.15
申请公布日期:2015.04.21
发明人:Shimada Masaaki;Tadamasa Yoshimichi
分类号:H02M3/335;H05B33/08
主分类号:H02M3/335
代理人:Birch, Stewart, Kolasch & Birch, LLP
地址:Saitama JP
摘要:A constant current power supply apparatus is provided which can drive a load with a constant current, even if the circuit configuration is such that a time delay is generated in the feedback control of a converter, or the like. An FB period restricting circuit including an ON generation circuit, OR circuit, inverter, and PMOS restricts the period during which an FB signal is fed back, to the logical sum of the ON period of an SW signal for driving an LED array on and a replenishment period generated by the OR circuit based on the SW signal. An FB signal generation circuit including a differential amplifier, NMOS, reference voltage, capacitor, and shunt regulator generates, in the replenishment period other than the ON period of the SW signal, an FB signal corresponding to an output current having flown through the LED array during the ON period of the SW signal.
主权项:1. A constant current power supply apparatus, supplying electric power from a primary side to a secondary side, and using the electric power supplied to the secondary side for driving a load on/off with a SW pulse signal as an external pulse signal supplied to the secondary side under PWM control, the constant current power supply apparatus comprising: a feedback signal generator circuit for generating a feedback signal corresponding to an output current flowing through the load; a feedback circuit for feeding back the feedback signal generated in the feedback signal generator circuit from the secondary side to the primary side; a control circuit for controlling the supply of electric power from the primary side to the secondary side by generating a pulse signal having a pulse width in response to the feedback signal fed back by the feedback circuit; and a feedback period restricting circuit for adjusting the period during which the feedback signal is fed back, wherein the feedback period restricting circuit has an OR circuit which adjusts the period during which the feedback signal is fed back to the logical sum of the ON period of the SW pulse signal as an external pulse signal during which the load is driven on, and a replenishment period during which the SW pulse signal is terminated, such that the power supply current is constant during a delay period in feeding back the feedback signal.
Method and apparatus for manufacturing magnetic media.
A motor vehicle parking system.
Surface acoustic wave devices.
Method of preparation of 2-chloropyrimidine.
Leak-proof alkaline cell and its production.
Method for making a lateral PNP or NPN transistor with a high gain and transistor so produced.
PROCEDE DE PREPARATION DE PRODUITS DE FORME SPHEROIDALE, SOLIDES A LA TEMPERATURE AMBIANTE
METHOD FOR OBTAINING OF CORONAL MEANS
ELECTROPHOTOGRAPH COPYING MACHINE
METHOD OF OBTAINING OF 1- THIAZOLINIL- 5 (6)- SUBSTITUATED BENZIMIDAZOLES
METHOD OF OBTAINING OF SUBSTITUATED N- (2,2- DIFLUORALKANOIL)- O- PHENYLENEDIAMINE COMPOUNDS
APPARATUS FOR FORMING OF TESTING SERIES IN GREY CODE
CLAMPING DEVICE FOR SMOOTH DRILLING SHEET
METHOD OF STICKING OF POLYACRYLNITRILE TEXTILE MATERIALS BY THEIR PRINTING