摘要:
A MOSFET implemented self-powered current by-pass or circuit breaker device is based on the use of a high multiplication factor (HMF) inductive voltage booster, adapted to boost a voltage as low as few tens of mV up to several Volts, assisted by a start-up low multiplication factor (LMF) charge pump made with low threshold transistors for providing a supply voltage to a polarity inversion detecting comparator of the drain-to-source voltage difference of a power MOSFET connected in parallel to a DC source or string of series connected DC sources or battery, in series to other DC sources during normal operation of the parallel connected DC source or string of series connected DC sources or battery. The inductance for the high multiplication factor, inductive voltage booster for most of the considered power applications is on the order of a few pH and such a relatively send inductor may be included as a discrete component in a compact package or “system-in-package” of monolithically integrated circuits.
摘要:
A by-pass circuit includes a first power MOS with an intrinsic diode, a first conduction terminal coupled to a cathode, a second conduction terminal coupled to an anode, and a control terminal. A tank capacitor is coupled to the anode. A second MOS has a first and second conduction terminals, a control terminal, and a turn-on threshold smaller than that of the intrinsic diode, the first conduction terminal thereof coupled to the cathode and the control terminal coupled to the anode, so the first MOS turns on when the array of cells are sub-illuminated. An oscillator and charge pump are supplied through the second conduction terminal of the second MOS to charge the tank capacitor. A control circuit is coupled to the control terminal of the first power MOS to switch it based upon a voltage of the tank capacitor and sign of the voltage between the cathode and anode.
摘要:
A photovoltaic energy conversion system includes a distributed control structure for groups of cells of each multi-cellular panel, the components of which are entirely physically integrated in the photovoltaic panel. Each multi-cellular photovoltaic panel has a DC bus, supplied in parallel by a plurality of DC-DC converters, each provided with a controller that controls the working point of the photovoltaic cells coupled to the input of the DC-DC converter for a maximum yield of electric power by implementing a relatively simple MPPT algorithm. The controller includes a logic circuit and A/D converters of analog signals representing the input voltage and the input current generated by the group of cells that is coupled to the input of the DC-DC converter and optionally also of the output voltage of the converter, and a relatively simple D/A converter of the drive control signal of the power switch of the DC-DC converter.
摘要:
An electric circuit includes a circuit path from a first reference voltage to a second reference voltage lower than the first reference voltage. The path includes a current generator, a capacitor, a first switching element suitable for connecting or disconnecting the capacitor with respect to the current generator. The first switching element has a triggering value and the electric circuit includes a second switching element placed in parallel to the capacitor and control elements suitable for acting on the first and second switching elements for controlling the charging and discharging of the capacitor. The control elements comprise a comparator operable during the charging of the capacitor and suitable for acting on the first switching element for blocking the charging of the capacitor when the voltage value at its terminals reaches a threshold voltage value. The threshold voltage value is lower than the triggering voltage of the first switching element and higher than the second reference voltage.
摘要:
An electric circuit includes a circuit path from a first reference voltage to a second reference voltage lower than the first reference voltage. The patha current generator, a capacitor, a first switching element suitable for connecting or disconnecting the capacitor with respect to the current generator. The first switching element has a triggering value and the electric circuit includes a second switching element placed in parallel to the capacitor and control elements suitable for acting on the first and second switching elements for controlling the charging and discharging of the capacitor. The control elements comprise a comparator operable during the charging of the capacitor and suitable for acting on the first switching element for blocking the charging of the capacitor when the voltage value at its terminals reaches a threshold voltage value. The threshold voltage value is lower than the triggering voltage of the first switching element and higher than the second reference voltage.
摘要:
A method is provided for carrying out a trimming operation on an integrated circuit having a trimming circuit portion which includes memory elements and a modification circuit for modifying the state of the memory elements, at least a first input or supply pin, an output pin, and a second supply pin. According to the method, a single pin is enabled to receive trimming data by biasing the pin to outside its operating range. A clock signal is obtained from a division of the bias potential of the pin, and the logic value of the trimming data is obtained from a different division of the bias potential of the pin. Serial acquisition of the data is enabled in accordance with the clock signal, and the data is transferred to the modification circuit.
摘要:
An electronic device smoothes a charge current peak in RLC output stages of switching step-up regulators, which stages include an input terminal and an output terminal with an inductance and a parasitic resistance in series therebetween, the latter corresponding to the series parasitic resistance of the inductance, and a capacitor connected between the output terminal and a ground. The device comprises a parallel of a resistor and a controlled switch connected between the inductance and the output terminal of the stage upstream of the capacitor. Advantageously, the switch would only be open during the charge transient of the capacitor.
摘要:
A drive circuit for a field-effect transistor is disclosed, the field-effect transistor having a drain terminal connected to the positive pole of a voltage supply and a source terminal connected to a load. The drive circuit comprises a first transistor connected between the gate terminal of the field-effect transistor and the negative pole of the voltage supply for turning off the field-effect transistor. The first transistor is driven by an operational amplifier which has inverting and non-inverting teminals connected to the gate and source terminals of the field-effect transistor, respectively. Switches alternatively intercouple the field-effect transistor to either another voltage supply or the first transistor.
摘要:
A by-pass circuit includes a first power MOS with an intrinsic diode, a first conduction terminal coupled to a cathode, a second conduction terminal coupled to an anode, and a control terminal. A tank capacitor is coupled to the anode. A second MOS has a first and second conduction terminals, a control terminal, and a turn-on threshold smaller than that of the intrinsic diode, the first conduction terminal thereof coupled to the cathode and the control terminal coupled to the anode, so the first MOS turns on when the array of cells are sub-illuminated. An oscillator and charge pump are supplied through the second conduction terminal of the second MOS to charge the tank capacitor. A control circuit is coupled to the control terminal of the first power MOS to switch it based upon a voltage of the tank capacitor and sign of the voltage between the cathode and anode.
摘要:
A MOSFET implemented self-powered current by-pass or circuit breaker device is based on the use of a high multiplication factor (HMF) inductive voltage booster, adapted to boost a voltage as low as few tens of mV up to several Volts, assisted by a start-up low multiplication factor (LMF) charge pump made with low threshold transistors for providing a supply voltage to a polarity inversion detecting comparator of the drain-to-source voltage difference of a power MOSFET connected in parallel to a DC source or string of series connected DC sources or battery, in series to other DC sources during normal operation of the parallel connected DC source or string of series connected DC sources or battery. The inductance for the high multiplication factor, inductive voltage booster for most of the considered power applications is on the order of a few pH and such a relatively send inductor may be included as a discrete component in a compact package or “system-in-package” of monolithically integrated circuits.