# US 2021/0281162 A1 · Power converter with over temperature protection compensation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0281162 A1 - Document ID: US20210281162A1 - Status: Published application - Kind: A1 - Application number: 17/327,630 - Filed: 2021-05-21 - Published: 2021-09-09 - Earliest claimed: 2019-02-01 - Assignees: Chicony Power Technology Co., Ltd. - Applicants: Chicony Power Technology Co., Ltd. - Inventors: Tso-Jen PENG; Ssu-Hao WANG - Web page: https://patentgrep.com/patent/US20210281162A1 ## CPC - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop} - H02M 1/327: {against abnormal temperatures} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A power converter with over temperature protection compensation includes a main conversion unit, a primary-side control unit, a secondary-side control unit, a secondary detection circuit, and an over temperature adjustment circuit. The secondary-side control unit obtains a secondary voltage change value through the secondary detection circuit, and the secondary-side control unit correspondingly provides a current change value to the over temperature adjustment circuit according to the secondary voltage change value. The over temperature adjustment circuit provides a temperature control voltage according to the current change value so that the secondary-side control unit determines whether an over temperature protection is activated according to the temperature control voltage. ## Claims ### Claim 1 A power converter with over temperature protection compensation, comprising: a main conversion unit having a primary side and a secondary side, the primary side coupled to an input voltage, the secondary side coupled to a secondary rectifier filter circuit, a primary-side control unit coupled to the primary side, a secondary-side control unit coupled to the primary-side control unit, a secondary detection circuit coupled to the secondary side, and an over temperature adjustment circuit coupled to the secondary-side control unit, wherein the secondary-side control unit is configured to obtain a secondary voltage change value corresponding to the change in the input voltage through the secondary detection circuit, and the secondary-side control unit is correspondingly configured to provide a current change value to the over temperature adjustment circuit according to the secondary voltage change value; the over temperature adjustment circuit is configured to provide a temperature control voltage according to the current change value so that the secondary-side control unit is configured to determine whether an over temperature protection is activated according to the temperature control voltage; wherein the secondary-side control unit is configured to turn off the main conversion unit through the primary-side control unit to activate the over temperature protection, or the power converter further includes a protection switch, the protection switch is coupled to the secondary rectifier filter circuit, and the secondary-side control unit is configured to turn off the protection switch to activate the over temperature protection. ### Claim 2 (depends on 1) The power converter in claim 1, wherein the over temperature adjustment circuit comprises a temperature control resistor, the temperature control resistor is configured to generate a temperature control resistance according to an ambient temperature, and the current change value flows through the temperature control resistance to generate the temperature control voltage. ### Claim 3 (depends on 1) The power converter in claim 1, wherein the secondary-side control unit comprises a comparison unit; when the comparison unit is configured to determine that the temperature control voltage is less than a reference voltage, the secondary-side control unit is configured to activate the over temperature protection. ### Claim 4 (depends on 1) The power converter in claim 1, wherein the input voltage is higher, the current change value provided by the secondary-side control unit is higher, and the input voltage is lower, the current change value provided by the secondary-side control unit is lower. ### Claim 5 (depends on 1) The power converter in claim 1, further comprising: an auxiliary winding coupled to the secondary detection circuit and the main conversion unit, wherein the auxiliary winding is configured to obtain an auxiliary voltage corresponding to a change of the input voltage through the main conversion unit or the auxiliary winding is configured to obtain the auxiliary voltage corresponding to a change of an output current provided by the secondary rectifier filter circuit. ### Claim 6 (depends on 5) The power converter in claim 5, wherein the secondary detection circuit comprises: a resistor coupled to the auxiliary winding, and a voltage division component coupled to the resistor, wherein the voltage division component is a voltage division resistor or a capacitor, and a node between the resistor and the voltage division component is coupled to the secondary-side control unit; the resistor is configured to receive the auxiliary voltage, and provide the secondary voltage change value through the node according to the auxiliary voltage. ### Claim 7 (depends on 6) The power converter in claim 6, wherein the secondary detection circuit further comprises: a diode coupled to the resistor, wherein the diode is configured to limit a polarity of the auxiliary voltage. ### Claim 8 (depends on 1) The power converter in claim 1, wherein the secondary detection circuit is coupled to the secondary rectifier filter circuit, and knows the secondary voltage change value according to a change of an output current provided by the secondary rectifier filter circuit. ### Claim 9 (depends on 8) The power converter in claim 8, wherein the secondary detection circuit comprises: a detection resistor coupled to the secondary-side control unit and the secondary-side control unit, wherein the output current flows through the detection resistor to generate the secondary voltage change value.