# US 2019/0379299 A1 · Power conversion device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379299 A1 - Document ID: US20190379299A1 - Status: Published application - Kind: A1 - Application number: 16/430,924 - Filed: 2019-06-04 - Published: 2019-12-12 - Earliest claimed: 2018-06-11 - Assignees: Denso Corporation - Applicants: Denso Corporation - Inventors: Takashi IMURA - Web page: https://patentgrep.com/patent/US20190379299A1 ## CPC - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 7/5387: in a bridge configuration - G01R 19/16571: {comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current (G01R19/16514, G01R19/16519, G01R19/16528, G01R19/16533, G01R19/1659 take precedence; measuring currents by using elements sensitive to the magnetic field generated G01R15/14; measuring earth resistance G01R27/18; testing for leakage or short circuits in electrical apparatus G01R31/52)} - G11C 16/30: Power supply circuits - H02H 1/06: Arrangements for supplying operative power {(power supply arrangements in general G05F, H02M)} - H02H 7/1213: {for DC-DC converters} - H02H 7/1222: {responsive to abnormalities in the input circuit, e.g. transients in the DC input} - H02M 1/36: Means for starting or stopping converters - G11C 17/16: using electrically-fusible links - H02H 11/002: {in case of inverted polarity or connection; with switching for obtaining correct connection} - H02J 7/68: using circuits for correcting or protecting against reverse-polarity - H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters} - H02M 1/0009: {Devices or circuits for detecting current in a converter} - H02M 1/0067: {Converter structures employing plural converter units, other than for parallel operation of the units on a single load} - 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) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G11C: STATIC STORES (semiconductor memory devices H10B) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A power conversion circuit is provided. The power conversion circuit includes a bridge circuit connected between power input terminals, a drive circuit supplied with power from a DC power source via the power input terminals, a boost circuit for, when the DC power source is reversely connected, starting up and supplying power to a control circuit, and a reverse voltage detection circuit for detecting a reverse voltage generated when the DC power source is reversely connected. ## Claims ### Claim 1 A power conversion device comprising: a bridge circuit that is connected between first and second power-input-terminals; a driving circuit that is supplied with power from a DC power source via the first and second power-input-terminals, and that drives and controls the bridge circuit; a control circuit that is capable of writing data into a non-volatile storage device; and a boost circuit that starts up and performs a boost operation to supply power to the control circuit when the DC power source is connected in reverse polarity to the first and second power-input-terminals; and a reverse voltage detection circuit that detects a reverse voltage generated when the DC power source is connected in the reverse polarity to the first and second power-input-terminals, wherein when the boost circuit starts up, the control circuit is supplied with the power and records in the non-volatile storage device a state of the reverse voltage detected by the reverse voltage detection circuit. ### Claim 2 (depends on 1) The power conversion device according to claim 1, wherein: when starting up, the control circuit reads out information stored in the non-volatile storage device, and when there is a record of the reverse voltage, the control circuit stops the driving circuit from driving and controlling the bridge circuit. ### Claim 3 (depends on 1) The power conversion device according to claim 1, further comprising: a temperature detection element that detects a temperature of a substrate on which the bridge circuit is disposed, wherein the control circuit records in the non-volatile storage device temperature information on the substrate detected by the temperature detection element in addition to the reverse voltage detected by the reverse voltage detection circuit. ### Claim 4 (depends on 1) The power conversion device according to claim 1, further comprising a current detection circuit that detects positive and negative current flowing in the bridge circuit, wherein the control circuit records in the non-volatile storage device a value of a reverse current detected by the current detection circuit in addition to the reverse voltage detected by the reverse voltage detection circuit. ### Claim 5 (depends on 1) The power conversion device according to claim 1, wherein in the non-volatile storage device, the control circuit records, as a time series, the reverse voltage detected by the reverse voltage detection circuit a plurality of times. ### Claim 6 (depends on 1) The power conversion device according to claim 1, further comprising a fuse having a built-in heating element, the fuse being arranged in a power supply path to the control circuit, wherein the control circuit outputs a command to fuse the fuse after the reverse voltage detection circuit detects the reverse voltage. ### Claim 7 (depends on 1) The power conversion device according to claim 1, wherein: the boost circuit is configured to further serves as a boost circuit for a high side driver of the bride circuit. ### Claim 8 (depends on 1) The power conversion device according to claim 1, wherein the boost circuit is provided as an integrated circuit formed on a SOI substrate.