US 11,750,186 B2
Over-temperature protection circuit
Hans-Juergen Braun, Duesseldorf (DE)
Assigned to RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
Appl. No. 16/960,479
Filed by RENESAS ELECTRONICS CORPORATION, Tokyo (JP)
PCT Filed Jan. 23, 2018, PCT No. PCT/EP2018/051552
§ 371(c)(1), (2) Date Jul. 7, 2020,
PCT Pub. No. WO2019/145017, PCT Pub. Date Aug. 1, 2019.
Prior Publication US 2020/0343885 A1, Oct. 29, 2020
Int. Cl. H03K 17/082 (2006.01); H02H 3/08 (2006.01); H02H 5/04 (2006.01); H03K 17/18 (2006.01); H03K 17/08 (2006.01)
CPC H03K 17/0822 (2013.01) [H02H 3/08 (2013.01); H02H 5/044 (2013.01); H03K 17/18 (2013.01); H03K 2017/0806 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An over-temperature protection circuit comprising:
an input for sensing a voltage at a first node arranged between an output terminal and a drain of a first transistor;
a voltage-to-current converter configured to generate a current in dependence upon the voltage, the voltage-to-current converter comprising a resistor which is comprised in a first path arranged between the input and a reference level;
an accumulator including a capacitor arranged to integrate the current or a scaled current obtained from the current and to provide an output; and
a comparator configured to:
determine whether the output exceeds a threshold output, wherein the output exceeding the threshold output is an inference of an over-temperature condition; and
in dependence on the output exceeding the threshold output, generate a signal for signaling that the first transistor is to be switched off.