Abstract:
A regulated voltage-boosting device including a charge-pump circuit (11), which has an input terminal (4a) receiving a first voltage (V DD ) and an output terminal (4b) supplying a second voltage (V LCD ) higher than said first voltage (V DD ), and being provided with a plurality of voltage-boosting stages (17) that can be selectively activated and deactivated. The regulated voltage-boosting device moreover comprises an automatic-selection circuit (10) for activating a number of voltage-boosting stages (17) which is correlated to the first voltage (V DD ) and to the second voltage (V LCD ).
Abstract:
The invention relates to a circuit architecture and a relevant method for performing a trimming operation directly on an application board, or after the operation of packaging integrated electronic devices. The circuit architecture of this invention comprises at least one non-volatile memory unit (3) having non-volatile memory elements (5) and a means (17,19) for modifying the state of the memory elements (5), a first multifunctional input pin (8) whereon a sequence (25) of trimming data is received, a second multifunctional input pin (9) whereon a timing signal of the trimming operations is received, and an additional access pin (7) for switching the circuit architecture operation from the normal mode over to the trimming mode. This circuit architecture further comprises a volatile memory unit (2) associated with the non-volatile memory unit (3) for storing up the non-volatile memory (3) state at power-on or at the simulating phase, and storing up the sequence (25) of trimming data at the programming phase; an interface (6) is provided between said pins (7,8,9) and the memory unit (2,3) for initially storing the data sequence (25) into the volatile memory unit and subsequently timing the trimming operation.
Abstract:
Integrated circuit (20, 80, 90) generating at least a voltage linear ramp having a slow rise of the type comprising an input terminal (21, 81, 91), connected to a first voltage reference (VREF) and an output terminal (24, 84, 94) adapted for providing a controlled ramp signal (V RAMP ), the circuit comprising at least one operational amplifier (OP3) having a non-inverting input terminal connected to said input terminal (21, 81, 91) and to an output terminal in feedback on an inverting input terminal and connected to the output terminal (24, 84, 94) of the ramp generator circuit (20, 80, 90) itself. The ramp voltage generator (20, 80, 90) according to the invention further comprises a first storage capacitance (Cs) connected between the non-inverting input terminal of the operational amplifier (OP3) and a ground voltage reference (GND) and loaded by means of a second pumping capacitance (Cp) inserted in parallel to said first capacitance (Cs) between the input terminal (21, 81, 91) of the ramp generator circuit (20, 80, 90) and the ground voltage reference (GND).
Abstract:
A circuit for detecting signals present on a bifilar voltage-supply and signal-transmission line, in which the signals are constituted by positive and negative variations of the supply potential of at least one of the wires of the line (2), comprises: a low-pass filter (20) connected to the two wires of the line in order to supply, at an output terminal of the filter, a constant reference potential (V+) substantially equal to the supply potential of a preselected one of the two wires, a first threshold comparator (21) having a reference input terminal (27) and a threshold input terminal (29) connected, respectively, to the output terminal (18) of the filter (20) and to the preselected wire of the two wires, and a second threshold comparator (22) having a reference input terminal (28) and a threshold input terminal (30) connected, respectively, to the preselected wire of the two wires and to the output terminal (18) of the filter (20). The circuit is relatively simple, does not require synchronization signals, and can be formed as an integrated circuit, taking up a limited area.
Abstract:
A battery-charging electronic device comprises a current generator (2) adapted to supply a charging current to a battery (3) and a controlled current edge switch having a circuit (1) for controlling the switching edges of current (I O ) being flowed through a power transistor (PW). The switching edge control circuit (1) comprises:
a controlled edge variable voltage generator for generating a controlled edge voltage signal (VA); a voltage/current converter (11) for converting the voltage signal (VA) to a controlled edge current signal (I R ); a driver circuit (12) for the power transistor (PW) being input the controlled edge current signal (I R ) to mirror, onto the power transistor (PW), an output current (I O ) which is proportional to the controlled edge current signal (I R ).
Abstract:
An outstandingly effective method of maximum power point tracking (MPPT) in operating a photovoltaic power plant that includes at least a DC-DC converter of the output voltage ( V PV ) of a single panel or of a plurality of series-parallel interconnected panels, having a power switch driven by a PWM control signal ( V PWM ) of variable duty-cycle (D) generated by a PWM control circuit, in discontinuous conduction mode (DCM) or continuous conduction mode (CCM) depending on the current load of the converter, is implemented by simple low cost analog circuits. The method does not require the use of any analog to digital conversion, digital processing or storage resources and requires only a single voltage sensor, in other words, no dissipative sensing resistance needs to be introduced.