High-voltage to low-voltage interface in power converter circuit
AssigneeAnalog Devices, Inc.
InventorsWen Chuen Liu, Xugang Ke, Min Chen, Wei Gu
Life of this patent
Estimating the term…
Abstract
A UHV-LV interface circuit that is capable of the following, among other things: 1) starting up a primary controller of a power converter circuit with a precisely controlled startup charging profile; 2) performing pulse-based line-voltage sensing with reduced power and improved sensing accuracy; and 3) discharging a capacitor, e.g., class-X2 capacitor, with a stable supply voltage for the controller. The UHV-LV interface circuit can use a single UHV device, such as a single depletion-mode transistor, e.g., field-effect transistor (FET).
Claims15
An interface circuit to couple an input voltage in a first voltage domain to a controller of a power converter circuit in a second voltage domain, the interface circuit comprising:
- a start-up circuit including:
- a current limiter circuit having an input coupled to with a terminal of a high-voltage transistor, the current limiter circuit having an output coupled to with and provide an input voltage to an input of the controller of the power converter circuit;
- and
- a first shunt regulator circuit having an input coupled to with the terminal of the high-voltage transistor, the first shunt regulator circuit to maintain a first voltage at the terminal of the high-voltage transistor.
An interface circuit to couple an input voltage in a first voltage domain to a controller of a power converter circuit in a second voltage domain, the interface circuit comprising:
- a depletion-mode transistor having a gate terminal, a source terminal, a drain terminal, and a substrate terminal, wherein the substrate terminal is connected to a ground potential;
- a start-up circuit including:
- a current limiter circuit having an input coupled to with a terminal of a high-voltage transistor, the current limiter circuit having an output coupled to with and provide an input voltage to an input of the controller of the power converter circuit;
- and
- a first shunt regulator circuit having an input coupled to with the terminal of the high-voltage transistor, the first shunt regulator circuit to maintain a first voltage at the terminal of the high-voltage transistor;
- and
- a line voltage detection circuit to sense a current proportional to a line voltage, the line voltage detection circuit including:
- a second shunt regulator circuit having an input coupled to with the terminal of the high-voltage transistor, the second shunt regulator circuit to maintain a second voltage at the terminal of the high-voltage transistor, the second voltage lower than the first voltage.
Dependencies are inferred from the claim text.