A voltage converter for an electrified vehicle is connected between an external low-voltage source and an external high-voltage source. The voltage converter includes a power conversion device having at least two power conversion components connected in parallel. The voltage converter further includes a safety power switching device, connected to the power conversion device and comprising at least two safety power switching components, configured for providing a protection mechanism for the voltage converter in an OFF or ON selection process thereof. Also included is a safety detection controller, connected to each of the safety power switching components, configured for real-time detection of each of the safety power switching components. A real-time detecting method for the voltage converter may be used in an electrified vehicle.

A power conversion circuit includes a first and a second power converters for generating a first and a second driving voltages respectively. The second power converter is a switching converter. In a short-circuit detection mode, the first driving voltage is regulated to the first driving level, and the second power converter is configured to operate in a pulse frequency modulation mode to regulate the second driving voltage to a short-circuit detection level, and when a switching frequency of the second power converter exceeds a threshold frequency, a short-circuit condition between the second driving voltage and the first driving voltage is determined.

In electrical systems with DC-DC converters having synchronous rectification (SR) on the output stage, the input voltage can be monitored. When a potentially destructive transient occurs, the SR is rapidly turned on in a non-synchronous manner to “crowbar” the main power transformer. The resulting short circuit is reflected back to the DC input under current-limited pulse width modulation (PWM) control. In effect, the entire surge rating of the power train is applied to the potentially destructive input transient. The clamping capacity can be controlled accurately and is significantly more than what is available in prior art components and systems. When the input voltage is pulled down to safe levels, the clamp circuit disengages and the DC-DC converter returns to normal operation. DC output voltage regulation to the connected load is not maintained during this clamping event, but maintaining output voltage regulation during such destructive transients is not required.

An electronic apparatus, a power supply apparatus, and a power supply method. The electronic apparatus may include a controller to provide a control signal to generate a multiphase signal through conversion of an input power and to receive a feedback of an output voltage that is generated using the multiphase signal; and a power supply including a plurality of unit converters having upper and lower switching elements of a half or full-bridge type, being operated by the control signal, and configured to provide the output voltage by the multiphase signal generated according to driving of the plurality of unit converters, wherein the power supply detects whether the upper and lower switching elements are simultaneously turned on in the plurality of unit inverters and turns off the operation of the unit converters according to the detection result.

The present application provides method and circuit for monitoring a power supply, which firstly obtains an auxiliary side voltage from a switching power supply and then adopts a divided voltage circuit to obtain a divided voltage from the auxiliary side voltage, for detecting the divided voltage and a detected current flowed in the detection circuit with adopting a first detection circuit and a second detection circuit in an switch circuit to correspondingly generate a first and a second detection signals, which is corresponding to an ambient temperature and an output voltage of the power supply. Hereby, the power supply is monitored.

The disclosure provides an over-current protection circuit. A signal generating block in the over-current protection circuit generates one or more input voltages, a summed voltage and an average voltage in response to one or more differential voltages. A control block generates one or more control signals in response to the one or more input voltages and the average voltage. An analog control loop block generates an initiation signal in response to the summed voltage and an output voltage. A phase control logic block generates one or more PWM (pulse width modulated) signals in response to the initiation signal and the one or more control signals.

A device (2) for the on-demand commutation of an electrical current from a first line branch (14, 3; 36) to another, second line branch (4; 41; 71) is created, which has a number of power semiconductor switching elements (7; 47; 53), which are arranged in series and/or parallel to one another in the second line branch (4; 41; 71), and a control unit (18; 51) for controlling the number of power semiconductor switching elements (7; 47; 53). The control unit (18; 51) is adapted to apply to each of the number of power semiconductor switching elements (7; 47; 53) an increased control voltage (VGE) whose level is above the maximum permissible control voltage specified for continuous operation, in order to switch on or maintain the conduction of the number of power semiconductor switching elements and to cause an increased current flow through it, whose current rating is at least double the nominal operating current. The control unit (18; 51) is further adapted to switch off the number of power semiconductor switching elements after a respectively provided short switch-on duration by switching off the control voltage (VGE) again while they conduct an increased current flow. The device (2) can thus be designed for a higher power in operation, or, at a given operating power, the semiconductor area and size of the device (2) can be reduced.

System and method for protecting a power converter. The system includes a first comparator configured to receive a first threshold signal and a first signal and to generate a first comparison signal. The first signal is associated with an input current for a power converter. Additionally, the system includes a second comparator configured to receive a second threshold signal and the first signal and to generate a second comparison signal. The second threshold signal is different from the first threshold signal in magnitude. Moreover, the system includes a first detection component configured to receive at least the second comparison signal, detect the second comparison signal only if one or more predetermined conditions are satisfied, and generate a first detection signal based on at least information associated with the detected second comparison signal.

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.

A circuit protection method comprises operating a range extender in a normal mode, wherein the range extender comprises at least one DC-to-DC converter having an input side and an output side and at least one bypass device coupled between the input side and the output side. The operating of the range extender in the normal mode comprises converting an input voltage at the input side into an output voltage at the output side by the DC-to-DC converter, wherein the output voltage is higher than a critical voltage. The method further comprises operating the range extender in a safety mode when the output voltage is lower than the critical voltage. The operating of the range extender in the safety mode comprises bypassing the DC-to-DC converter by the bypass device, wherein the critical voltage is lower than or equal to the input voltage.