Switch protection i auxiliary resonant circuit
AssigneeComsys AB
InventorsDan Liljegren, Oscar Haraldsson
Life of this patent
Estimating the term…
Abstract
A resonant power converter comprising electrical safety components comprising a combination of a diodes and a zener diodes coupled between DC conductors and an auxiliary switching circuit, the diodes being adapted to hinder the current from flowing from the auxiliary switching circuit to the negative DC conductor, and the zener diodes being adapted to allow current to flow from the negative DC conductor to the auxiliary switching circuit when the potential difference between the negative DC conductor and the phase conductor is above a threshold voltage. The Zener diodes being selected such that the threshold voltage of the Zener diodes is below the maximum blocking voltage of the transistors.
Claims11
A resonant power converter comprising:
- a DC power source,
- a positive DC conductor,
- a negative DC conductor,
- a phase conductor, and
- a power converting unit coupled between the DC power source and the phase conductor, the power converting unit comprising:
- a first switch coupled between the positive DC conductor and the phase conductor and a first diode connected in parallel with the first switch,
- a second switch coupled between the negative DC conductor and the phase conductor and a second diode connected in parallel with the second switch, and
- a resonant auxiliary switching circuit coupled between a feeding connection on the DC power source and the phase conductor, the resonant auxiliary switching circuit comprising:
- at least one inductor coupled in series with transistors for controlling the resonant auxiliary switching circuit and auxiliary diodes coupled in series with the transistors,
- a first electrical safety component comprising a combination of a diode and a Zener diode coupled between the positive DC conductor and the auxiliary switching circuit, the diode being adapted to hinder a current from flowing from the auxiliary switching circuit to the negative DC conductor, and the Zener diode being adapted to allow a current to flow from the positive DC conductor to the auxiliary switching circuit when a potential difference between the positive DC conductor and the phase conductor is above a first threshold voltage, and wherein the Zener diode is selected such that the first threshold voltage of the Zener diode is below the maximum blocking voltage of the transistors, and
- a second electrical safety component comprising a combination of a diode and a Zener diode coupled between the negative DC conductor and the auxiliary switching circuit, the diode being adapted to hinder a current from flowing from the auxiliary switching circuit to the negative DC conductor, and the Zener diode being adapted to allow a current to flow from the negative DC conductor to the auxiliary switching circuit when a potential difference between the negative DC conductor and the phase conductor is above a second threshold voltage, and wherein the Zener diode is selected such that the second threshold voltage of the Zener diode is below the maximum blocking voltage of the transistors.
Dependencies are inferred from the claim text.