Methods and apparatus for precharge monitoring of high voltage circuits
AssigneeMotiv Power Systems, Inc.
InventorsVenkatesh Prasad Hanglur Narasimha, James Michael Castelaz
Life of this patent
Estimating the term…
Abstract
Methods and apparatus to monitor the precharging of high voltage circuits are disclosed. In one embodiment, an apparatus includes a switch that selectively enables or disables precharge current to a high voltage circuit based on a switch control signal. The apparatus also includes a comparison circuit that compares a scaled version of a circuit voltage to a reference voltage to generate the switch control signal. In one embodiment, the switch control signal is generated to enable the precharge current when the scaled version of the circuit voltage is greater than the reference voltage.
Claims23
An apparatus comprising:
- a precharge switch that selectively enables or disables precharge current from a Direct Current (DC) source to a capacitor;
- a comparison circuit that generates a switch control signal to continuously control the precharge switch, wherein the switch control signal is generated based on a comparison between a scaled version of a circuit voltage and a reference voltage;
- and
- a reference circuit that receives a precharge command signal and generates the reference voltage, wherein the precharge switch changes state in response to the precharge command signal changing state.
A method comprising:
- selectively enabling or disabling precharge current from a Direct Current (DC) source to a capacitor based on a switch control signal;
- and
- comparing a scaled version of a circuit voltage to a reference voltage to generate the switch control signal, wherein the comparing is performed non-discretely during precharge, wherein the reference voltage is generated from a precharge command signal, and wherein the switch control signal changes state in response to the precharge command signal changing state.
An apparatus comprising:
- a switch that controls precharge current from a Direct Current (DC) source to a capacitor;
- and
- means for enabling and disabling the switch by continually comparing a scaled circuit voltage and a reference voltage wherein the reference voltage is generated from a precharge command signal, and wherein the switch changes state in response to the precharge command signal changing state.
Dependencies are inferred from the claim text.