Abstract: A controllable temperature coefficient bias (CTCB) circuit is disclosed. The CTCB circuit can provide a bias to an amplifier. The CTCB circuit includes a variable with temperature (VWT) circuit having a reference circuit and a control circuit. The control circuit has a control output, a first current control element and a second current control element. Each current control element has a “controllable” resistance. One of the two current control elements may have a relatively high temperature coefficient and another a relatively low temperature coefficient. A controllable resistance of one of the current control elements increases when the controllable resistance of the other current control element decreases. However, the “total resistance” of the current control circuit remains constant with a constant temperature. The VWT circuit has an output with a temperature coefficient that is determined by the relative amount of current that flows through each current control element of the control circuit.

Abstract: A voltage booster powered by a primary electrical source for providing an adjustable voltage across the load, while a current regulator in series with the load maintains the desired current. When the voltage drop across the current regulator exceeds an upper threshold, the voltage booster's output voltage is reduced to a lower level to reduce the power dissipated by the current regulator, to improve efficiency. When the voltage drop across the current regulator is less than a lower threshold, the voltage booster output is increased to a higher level. In burst mode operation, the voltage booster output alternates between a full voltage and zero voltage, and an optional capacitor provides voltage across the resistive load during discharge. An optional diode can ensure that the capacitor discharges through the load in cases where the voltage booster output is not floating.

Abstract: An isolated switching converter has a primary switch and a control circuit. The control circuit has a first sampling circuit, a second sampling circuit, a compensation circuit and a feedback control circuit. The first sampling circuit is coupled to an auxiliary winding of a transformer to receive a voltage on the auxiliary winding and is configured to generate a first feedback signal having an alternating current signal indicative of an output voltage. The second sampling circuit is coupled to the auxiliary winding through a first rectifier and is configured to generate a second feedback signal having a direct current signal indicative of the output voltage. The compensation circuit is configured to generate a compensation signal based on the first feedback signal, the second feedback signal and a reference threshold. The feedback control circuit is configured to generate a primary control signal of the primary switch based on the compensation signal.

Abstract: An inline DC feeder DC/DC voltage step-up harness for photovoltaic solar facilities includes a housing, a plurality of PV input connectors, an at least one PV output connector. The housing incorporates a DC/DC converter, and has an input and an output. The plurality of PV input connectors are operatively connected to the housing at the input. The PV output connector is operatively connected to the housing at the output.

Abstract: A regulator includes an error amplification module, a first switch module, an adaptive conduction module, a second switch module and a feedback module. A first voltage difference between the second terminal and the third terminal of the first switch module is adjusted by the first switch module. The adaptive conduction module is used to adjust a second voltage difference between the second terminal and the third terminal of the second switch module. When the load current is less than a preset current threshold, the control voltage signal controls the first switch module to turn on, and the adaptive conduction module controls the second switch module to turn off. When the load current is greater than or equal to the preset current threshold, the control voltage signal controls the first switch module to turn on and controls the second switch module to be turned on through the adaptive conduction module.

Abstract: A voltage regulator includes a first amplifier having a first gain and a first frequency bandwidth, and generating a first voltage output; a second amplifier having a second gain that is lower than the first gain and a second frequency bandwidth that is higher than the first frequency bandwidth, and generating a second voltage output; a summer generating a summed voltage output based on the first voltage output and the second voltage output; and a transistor connected to the summer and generating a regulated voltage based on the summed voltage output of the summer.

Abstract: A switching converter includes a voltage conversion circuit providing an output voltage from an input voltage and a PWM voltage generated in response to first and second oscillating voltages. The input stage of a transconductor circuit provides an input reference current following a difference between a reference voltage and a voltage dependent on the output voltage and according to a transconductance, and an output stage for providing an output reference current from the input reference current. A phase shifter shifts an oscillating reference voltage according to the output reference current to obtain the first and second oscillating voltages. The transconductance is controlled in response to the input voltage resulting in a change of the input reference current. Compensation for that change is provided by subtracting a variable compensation current from the input reference current, where the variable compensation current is generated in response to the input voltage.

Abstract: A linear power source 1 comprises: an output transistor 10 that is connected between an input end of an input voltage VIN and an output end of an output voltage VOUT; a driver 30 for driving the output transistor 10 so that a feedback voltage VFB according to the output voltage VOUT matches a reference voltage VREF; a current detection unit 50 for detecting an output current IOUT flowing to the output transistor 10; and a voltage adjustment unit 40 for adjusting the reference voltage VREF or the feedback voltage VFB so that a differential voltage between a first voltage (for example, VIN itself) according to the input voltage VIN and a second voltage (for example, VOUT itself) according to the output voltage VOUT or the reference voltage VREF will not fall below an offset voltage Voffset according to the output current IOUT.

Abstract: A power converter, comprising an energy transfer element, an output of the power converter, a power switch, an active clamp circuit, and a first controller. The active clamp circuit comprising a capacitance, a steering diode network coupled to the capacitance and configured to transfer a charge to the capacitance, a clamp switch coupled to the capacitance and configured to transfer the charge stored in the capacitance to the energy transfer element, and an offset element coupled to the clamp switch and configured to provide a path to discharge a capacitance associated with the clamp switch. The first controller configured to output a clamp drive signal to control the turn on and turn off of the clamp switch and a primary drive signal to control the turn on and turn off of the power switch.

Abstract: A bandgap reference voltage generator can include a bandgap core circuit configured to output at least one control voltage. The bandgap reference voltage generator can further include feedback circuitry that can be configured to receive a control voltage outputted by the bandgap core circuit or another control voltage generated based on the control voltage, and output a current. The current can be outputted such that the current is sourced to or sank from the bandgap core circuit. The feedback circuitry can be further configured to generate a bandgap reference voltage. When the current is sourced to the bandgap core circuit, the bandgap reference voltage can be greater than a threshold value. Similarly, when the current is sank from the bandgap core circuit, the bandgap reference voltage can be less than the threshold value.

Abstract: A switching regulator may be used to generate an output voltage from an input voltage. The switching regulator includes; an inductor including a first terminal and a second terminal that passes an inductor current from the first terminal to the second terminal, a first switch that applies the input voltage to the first terminal when turned ON, a second switch that applies a ground potential to the first terminal when turned ON, a feedback circuit configured to estimate a load receiving the output voltage, detect when the inductor current reaches an upper bound or a lower bound, and adjust the lower bound based on the estimated load, and a switch driver configured to control the first switch and the second switch, such that the inductor current is between the upper bound and the lower bound in response to at least one feedback signal provided by the feedback circuit.

Abstract: Method of operating a bidirectional DC DC converter that transfers power among an energy source (for example, a solar PV array), an energy storage system, and an energy usage system (for example, a DC AC inverter) to control the charge and discharge times of the energy storage system so that power harvested during peak energy source production can be stored and can later be released to the energy usage system at predetermined times.

Abstract: A system for regulating electrical energy transfer over a pathway including a DC link (16, 18, 20) is provided. The system is configured for computing a rate of electrical energy flow through the DC link at least in part on a basis of a state of balance between power generation and a load determined from frequency measurement (32, 34) and for adjusting the rate of electrical energy flow through the DC link. An electrical vehicle charger is provided that includes a power input for connection to an AC power distribution network and a power output for connection to an electric vehicle, and is configured for determining a rate of electrical energy flow through the power output by using as a factor a state of balance between power generation and load in an AC power distribution network to which the power input connects. A method for regulating electrical energy transfer over a pathway including a DC link is also provided.

Abstract: A voltage source converter is configured to generate a pulse train using two voltage levels. The voltage source converter includes a first converter arm coupled between a junction and a first DC terminal having a first voltage level and a second converter arm coupled between the junction and a second DC terminal having a second voltage level. At least one of the first and second converter arms comprises cells. A string of capacitors is coupled between the first and second DC terminals. A control unit is configured to control a group of cells used in a transition between the first and second voltage levels for commutating a current running through a corresponding one of the first and second converter arms involved in the transition.

Abstract: Aspects of the disclosure provide for a circuit. In at least some examples, the circuit comprises a first amplifier, a voltage divider, a first resistor, and a transistor. The first amplifier comprises a first input terminal configured to receive a first voltage signal, a second input terminal coupled to a first node, and an output terminal. The voltage divider is coupled between a second node and a ground node and having the first node as an output node of the voltage divider. The first resistor is coupled at a first end to the second node. The transistor comprises a gate terminal coupled to the output terminal of the first amplifier, the transistor being coupled between an input voltage node and a second end of the first resistor.

Abstract: A voltage regulator is provided. The voltage regulator includes an output terminal, a transistor, a primary driving circuit, and a secondary driving circuit. The output terminal is adapted to output an output voltage. The primary driving circuit is coupled to a control terminal of the transistor. The secondary driving circuit is coupled between the control terminal of the transistor and a predetermined voltage terminal. When the voltage regulator operates in a start-up mode, the transistor is driven by the primary driving circuit and the secondary driving circuit, and the control terminal of the transistor and the predetermined voltage terminal are electrically coupled by the secondary driving circuit. When the voltage regulator operates in a normal mode, the transistor is driven by the primary driving circuit, and an electrical coupling between the control terminal of the transistor and the predetermined voltage terminal is disconnected by the secondary driving circuit.

Abstract: A dropout detection circuit for an LDO voltage regulator is disclosed. An LDO voltage regulator includes a power transistor having a drain terminal coupled to an output voltage node and a gate terminal coupled to an output of an error amplifier. A source terminal of the power transistor is coupled to an input voltage node. The circuit further includes a detection circuit having a first input coupled to the gate terminal and a second input coupled to the drain terminal. The detection circuit is configured to generate an indication responsive to detecting that the LDO voltage regulator has entered operation below a minimum dropout.

Abstract: For inductor-based DC-DC converters, a current shunt switch can provide an alternate path for the inductor current to flow that does not include the output capacitor. An amplifier circuit can be included and coupled with a control node of the current shunt switch to adjust a voltage on the control node to control an amount of inductor current diverted away from the output node. A fast linear loop can be included to ensure smooth transitions when engaging or disengaging the current shunt switch. These techniques can minimize the amount and duration of the subsequent negative output voltage excursion, which can be dependent on the specific ESL and ESR values of the output voltage capacitor, for the cases when the final value of the step-down load-transient is not zero. These techniques can improve a positive output voltage response caused by an output load transient in the negative direction.

Abstract: A bias circuit includes a linear core circuit CC with first and second mutually type corresponding transistors (M1; M2) and a current mirror CM with third and fourth transistors (M3; M4) of opposite type of M1 and M2. To obtain an equilibrium with a constant transconductance of the first transistor, first and second negative feedback loops (L1; L2) are applied, one including the linear core circuit CC, the other including the current mirror CM. In a first setting one loop suppresses differences between first and second drain voltages (Vd1; Vd2) and the other loop suppresses differences between one of of the first and second drain voltage Vd1 and Vd2 and a reference voltage Vref. In the second setting, one loop suppresses differences between the first drain voltage Vd1 and the reference voltage Vref and the other loop differences between the second drain voltage Vd2 and the reference voltage Vref.

Abstract: Circuits and methods that provide for fast power up and power down times in a multi-stage LDO regulator. In one embodiment, a multi-stage LDO regulator circuit includes, for each stage for which fast power up and/or power down times are desired, at least one transconductance amplifier coupled and configured to compare a primary reference voltage to one of a secondary reference voltage for the stage or an output voltage of the stage, and coupling and configuring the at least one transconductance amplifier to charge and/or discharge an associated capacitor to achieve a desired charge level within a specified time independently of the value of the associated capacitor. In general, the transconductance amplifiers of each stage are configured to charge and/or discharge an associated capacitor in synchronism with a voltage present on the primary reference voltage input.