A switched-mode power supply for use in an intralogistics system for goods has a housing with a first power output with a first operating voltage for first electrical consumers. The housing of the switched-mode power supply has at least a second power output with a second operating voltage for second electrical consumers. The second operating voltage at the second power output is greater than the first operating voltage at the first power output.

A power conversion device capable of shortening the time required for acceleration of a motor and a metal processing device including the power conversion device are provided. Then, a power conversion device 10 includes a converter 100 configured to convert an AC voltage from outside to a DC voltage Vo and a converter controller 107 configured to control the converter 100. The converter 100 includes a voltage doubler circuit 104 configured to boost the DC voltage Vo when activated, and outputs the DC voltage Vo having a voltage value different in accordance with the activation and stop of the voltage doubler circuit 104. The converter controller 107 activates the voltage doubler circuit 104 at a first time that is earlier by a predetermined period than a second time at which a speed command value ω* of the motor 130 rises from a predetermined value.

A power conversion device capable of shortening the time required for acceleration of a motor and a metal processing device including the power conversion device are provided. Then, a power conversion device 10 includes a converter 100 configured to convert an AC voltage from outside to a DC voltage Vo and a converter controller 107 configured to control the converter 100. The converter 100 includes a voltage doubler circuit 104 configured to boost the DC voltage Vo when activated, and outputs the DC voltage Vo having a voltage value different in accordance with the activation and stop of the voltage doubler circuit 104. The converter controller 107 activates the voltage doubler circuit 104 at a first time that is earlier by a predetermined period than a second time at which a speed command value ω* of the motor 130 rises from a predetermined value.

A resonant DC-DC converter may include an input for inputting a DC supply voltage, an output for providing a DC voltage to a load, an output rectifier to convert the converter voltage into a DC voltage, a resonant half-bridge inverter comprising two switches in series with a first serial resonant circuit to adjust the output current of the converter, and a second serial resonant circuit to block DC current in the converter and provide current continuity within the converter. The resonance of the first serial resonant circuit is measured after every start of the converter and each measurement defines the switching frequency of the half-bridge inverter. The switches of the half-bridge inverter wherein the driving of the half-bridge inverter includes a key gap during operation thereof. The resonance frequency of the second serial resonant circuit is at least slightly above the switching frequency of the half-bridge inverter.

A resonant DC-DC converter may include an input for inputting a DC supply voltage, an output for providing a DC voltage to a load, an output rectifier to convert the converter voltage into a DC voltage, a resonant half-bridge inverter comprising two switches in series with a first serial resonant circuit to adjust the output current of the converter, and a second serial resonant circuit to block DC current in the converter and provide current continuity within the converter. The resonance of the first serial resonant circuit is measured after every start of the converter and each measurement defines the switching frequency of the half-bridge inverter. The switches of the half-bridge inverter wherein the driving of the half-bridge inverter includes a key gap during operation thereof. The resonance frequency of the second serial resonant circuit is at least slightly above the switching frequency of the half-bridge inverter.

A power supply device includes a transformer, a first rectifier, a voltage conversion module, and a control unit. The first rectifier is connected to a primary winding of the transformer, converts a received alternating-current voltage to a first direct-current voltage. The transformer is configured to convert the first direct-current voltage to a second direct-current voltage. The voltage conversion module is connected to the secondary winding of the transformer and configured to convert the second direct-current voltage to output a third direct-current voltage. The control unit, connected to the voltage conversion module, controls the voltage conversion module to adjust an output voltage or an output current of the power supply device.

A power supply device includes a transformer, a first rectifier, a first voltage conversion module, a second voltage conversion module, and a control unit. The first rectifier, connected to a primary winding of the transformer, converts a received alternating-current voltage to a first direct-current voltage. The first voltage conversion module is connected to the first secondary winding of the transformer. The second voltage conversion module is connected to the second secondary winding of the transformer. The control unit, connected to the first voltage conversion module and second voltage conversion module, controls the first voltage conversion module or second voltage conversion module to adjust an output voltage or an output current of the power supply device.

Provided are a power supply conversion circuit and a power supply conversion method. The power supply conversion circuit includes a first direct-current conversion circuit connected to an electric load, a secondary transformer coil connected to the first direct-current conversion circuit, and a primary transformer coil coupled to the secondary transformer coil. The primary transformer coil is configured to generate, based on an initial voltage inputted to the primary transformer coil, an electromagnetic field and couple the electromagnetic field to the secondary transformer coil. The secondary transformer coil is configured to generate an induced current by virtue of the electromagnetic field, generate a secondary output voltage based on the induced current, and transmit the secondary output voltage to the first direct-current conversion circuit. The first direct-current conversion circuit is configured to adjust, based on a predetermined demand voltage of the electric load, the secondary output voltage to obtain a target voltage.

A power supply circuit includes a rectifier circuit, configured to convert an alternating current inputted to the rectifier circuit into a direct current; a primary power supply conversion circuit having an input end connected with an output end of the rectifier circuit, configured to convert an input voltage of the primary power supply conversion circuit which is out of a preset voltage range into an output voltage of the primary power supply conversion circuit within the preset voltage range; and a secondary power supply conversion circuit having an input end connected with an output end of the primary power supply conversion circuit, configured to convert a direct current voltage outputted by the primary power supply conversion circuit into a target direct current voltage. A lower limit of the preset voltage range is greater than a minimum working voltage of the secondary power supply conversion circuit.

Provided by the present disclosure are a power supply circuit and a charging device. The power supply circuit comprises a pulse transformer circuit and a first power supply conversion circuit. The pulse transformer circuit comprises a pulse transformer and a switch control circuit; a primary winding of the pulse transformer is connected to a power supply and is connected to the switch control circuit, and the switch control circuit is used to modulate the voltage on the primary winding into a pulse voltage; and the input terminal of the first power supply conversion circuit is connected to a secondary winding of the pulse transformer, and is used to transform the voltage on the secondary winding of the pulse transformer into a first preset voltage range when the voltage outputted by the secondary winding exceeds the first preset voltage range, and then output the voltage.