Providing a boost voltage with a transient operation

Abstract

A system, method and circuit for providing a boost voltage with a transient operation of a vehicular start-stop system are provided. The system includes a duty cycle or current monitor to detect a change in duty cycle or current based on the transient operation; a crank time-out detector to determine whether the change in duty cycle is over a predetermined threshold; and a reset generator to generate a reset of a boost circuit that generates the boost voltage after a predetermined delay.

1 - 6 . (canceled) 
     
     
         7 . A circuit for controlling a boost circuit of a start-stop system based on a transient condition, comprising:
 a digital-to-analog circuit connected to a boost gate drive of the boost circuit, and configured to provide an analog signal of a duty cycle on the boost gate drive;   an opamp circuit configured to detect whether the analog signal is above a predetermined threshold;   a delay circuit configured to introduce a delay signal based on whether the analog signal is detected to be above the predetermined threshold; and   a reset generator configured to control the boost circuit to shut off based on the delay signal from a delay circuit.   
     
     
         8 . The circuit according to  claim 7 , wherein the duty cycle corresponds to a vehicular battery being loaded based on a demand for current. 
     
     
         9 . The circuit according to  claim 7 , wherein the demand for current is based on start-stop system transitioning from a stop mode to a start mode. 
     
     
         10 . The circuit according to  claim 7 , wherein the delay signal is based on a signal strength of the analog signal. 
     
     
         11 . The circuit according to  claim 7 , further comprising a second opamp connected in-between the delay circuit and the reset generator. 
     
     
         12 . The circuit according to  claim 7 , wherein the reset generator comprises a pull-down switch to activate a reset. 
     
     
         13 . The circuit according to  claim 7 , wherein the boost circuit is configured to constantly provide boost voltage during a low voltage state of the battery, and the boost circuit is configured to provide boost voltage during a crank state based on the delay signal. 
     
     
         14 - 18 . (canceled) 
     
     
         19 . A method for, with a circuit, controlling a boost circuit of a start-stop system based on a transient condition, comprising:
 providing an analog signal of a duty cycle on a boost gate drive of the boost circuit using a digital-to-analog circuit connected to the boost gate drive;   detecting, with an opamp circuit, whether the analog signal is above a predetermined threshold;   introducing, with a delay circuit, a delay signal based on whether the analog signal is detected to be above the predetermined threshold; and   controlling, with a reset generator, the boost circuit to shut off based on the delay signal from a delay circuit.   
     
     
         20 . The method according to  claim 19 , wherein the duty cycle corresponds to a vehicular battery being loaded based on a demand for current. 
     
     
         21 . The method according to  claim 19 , wherein the demand for current is based on start-stop system transitioning from a stop mode to a start mode. 
     
     
         22 . The method according to  claim 19 , wherein the delay signal is based on a signal strength of the analog signal. 
     
     
         23 . The method according to  claim 19 , wherein a second opamp is connected in-between the delay circuit and the reset generator. 
     
     
         24 . The method according to  claim 19 , further comprising activating a reset using a pull-down switch of the reset generator. 
     
     
         25 . The method according to  claim 19 , further comprising:
 constantly providing, by the boost circuit, boost voltage during a low voltage state of the battery; and   providing, by the boost circuit, boost voltage during a crank state based on the delay signal.