A circuit converts an AC or DC electrical input applied between first and second input leads into a DC output applied to a load via first and second output leads. Four thyristors have their anodes respectively connected to one of the first and second input leads or one of the first and second output leads. Cathodes of two thyristors are connected to the first and second output leads while cathodes of two other thyristors are connected to the first and second input leads. Gates of each thyristor are connected to respective unidirectional switches that open and close at the same time. When closed, the unidirectional switches polarize the gates. Thyristors having a positive voltage on their anodes apply this voltage to the first output lead to power the load. Thyristors having a negative voltage on their cathodes transmit return current from the load to the first or second input lead.

System controller and method for a power converter. For example, a system controller for a power converter includes a logic controller configured to generate a modulation signal, and a driver configured to receive the modulation signal, generate a drive signal based at least in part on the modulation signal, and output the drive signal to a switch to affect a current flowing through an inductive winding for a power converter. Additionally, the system controller includes a voltage-to-voltage converter configured to receive a first voltage signal, the modulation signal, and a demagnetization signal, and to generate a second voltage signal based at least in part on the first voltage signal, the modulation signal, and the demagnetization signal.

An input circuit for a power supply includes an input voltage that is converted into an output voltage via periodic switching of a switch between conductive/blocked states, wherein current that charges a capacitance and supplies output voltage flows through an inductor at least during switching of the switch, and is absorbed by an active switch unit when the switch is in the blocked state and is permitted through the switch in the blocked state, upon exceeding a predefined breakdown voltage at the switch, such that during an overvoltage at the input circuit, the switch is switched into the blocked state, and current flow that then occurs is relayable into the inductor and the active switch unit is deactivatable, the switch and inductor being dimensioned such that, during an overvoltage, an “avalanche energy” occurs at the switch, upon which the switch withstands the current flowing through the inductor during the over-voltage.

A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.

A power supply control apparatus includes: a semiconductor switching element switched with PWM control; a PWM signal output unit outputting a PWM signal; a current circuit outputting a current related to a current flowing through the semiconductor switching element; a filter circuit converting the current that is output from the current circuit to a voltage; an overcurrent protection circuit turning off the semiconductor switching element based on a voltage value of the voltage filtered by the filter circuit; a voltage detection unit detecting the voltage value of the voltage at a timing near an end of a pulse of a PWM signal; a temperature estimation unit estimating, a temperature of an electric wire through which a current flows that also flows through the semiconductor switching element; and an electric wire protection unit turning off the semiconductor switching element based on the temperature estimated by the temperature estimation unit.

Disclosed is a primary-clocked switching power supply for converting an input voltage into an output voltage, comprising: a primary side circuit branch, where the input voltage can be applied; isolated from the primary side circuit branch, a secondary side circuit branch, where the output voltage is tappable; between the primary side and the secondary side circuit branch, a galvanic isolation; a fuse or circuit breaker arranged in the primary side circuit branch; a first switchable switch element arranged in the primary side circuit branch such that switching trips the primary side fuse or circuit breaker; and a monitoring unit connected with the first switch element and arranged in the primary side circuit branch and adapted to monitor a characteristic electrical signal determined by the second primary winding and, when the characteristic electrical signal exceeds a threshold value, to switch the first switch element.

Example DC-DC converters include a housing having at least two bullet terminals. The at least two bullet terminals are configured to mate with corresponding terminals in a DC bullet breaker panel. The converter also includes a DC-DC voltage converter circuit coupled between the at least two bullet terminals, and a controller coupled with the DC-DC voltage converter circuit. The controller is configured to control the DC-DC converter circuit to convert a DC input voltage at a first one of the at least two bullet terminals to a different DC output voltage at another one of the at least two bullet terminals. Methods of converting DC voltages using DC-DC converters having bullet terminals are also disclosed.

An example system includes an input voltage terminal; a power converter integrated circuit (IC) package fuselessly coupled to the input voltage terminal and having first and second pins, the power converter IC package configured to detect a short between the first and second pins; and a load circuit coupled to the power converter IC package.

A control method, which is applied to a conversion circuit including at least one bridge arm and an inductor, the bridge arm including an upper semiconductor switch and a lower semiconductor switch connected in series, and one end of the inductor being connected to a midpoint of the bridge arm, includes: detecting a direction of current of the inductor when a scram event occurs in the conversion circuit; turning on the upper semiconductor switch and turning off the lower semiconductor switch when the direction of current of the inductor is a first direction, wherein the first direction is the direction when the current flows from one end of the inductor to the midpoint of the bridge arm; and turning off the upper semiconductor switch and turning on the lower semiconductor switch when the direction of current of the inductor is a second direction.

A power control device includes: an output voltage controller configured to control an output voltage based on a feedback voltage corresponding to the output voltage; and an overvoltage protector configured to continue or stop the operation of the output voltage controller based on a first detection result of whether the output voltage has exceeded an output voltage threshold value and a second detection result of whether the feedback voltage has fallen to or below a feedback voltage threshold value.