# US 10,122,191 B2 · Battery protection circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,191 B2 - Document ID: US10122191B2 - Status: Granted - Kind: B2 - Application number: 15/361,514 - Filed: 2016-11-28 - Published: 2017-07-13 - Granted: 2018-11-06 - Earliest claimed: 2016-01-07 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Kyong-Pil Jin; Myung-Sang Lee - Web page: https://patentgrep.com/patent/US10122191B2 ## CPC - H02J 7/60: including safety or protection arrangements - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H02H 7/18: for batteries; for accumulators - H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries - H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)} - H03K 17/04106: {in field-effect transistor switches (H03K17/0412, H03K17/0416 take precedence)} - H03K 17/102: {in field-effect transistor switches} - H03K 17/6877: {the control circuit comprising active elements different from those used in the output circuit} - H01M 10/4264: {with capacitors} - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H02H 3/05: with means for increasing reliability, e.g. redundancy arrangements {(for logic circuits H03K19/003)} - H02J 7/61: against overcharge - H02J 7/62: against overcurrent - H02J 2207/20: Charging or discharging characterised by the power electronics converter - Y02E 60/10: Energy storage using batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - 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) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A battery protection circuit includes a voltage source, a first resistor, a charging controller, a first charging transistor, a second resistor, and a current voltage converter. The first resistor includes a first terminal connected to the voltage source. The charging controller supplies a charging control current through a charging control terminal. The first charging transistor includes a gate terminal and a first terminal. The second resistor is connected between the gate terminal and first terminal of the first charging transistor. The current voltage converter is connected to a second terminal of the first resistor to electrically connect the voltage source to the gate terminal of the first charging transistor depending on the charging control current. ## Claims ### Claim 1 A battery protection circuit, comprising: a voltage source; a first resistor including a first terminal connected to the voltage source; a charging controller to supply a charging control current through a charging control terminal; a first charging transistor including a gate terminal and a first terminal; a second resistor connected between the gate terminal and the first terminal of the first charging transistor; and a current voltage converter connected to a second terminal of the first resistor to electrically connect the voltage source to the gate terminal of the first charging transistor depending on the charging control current. ### Claim 2 (depends on 1) The battery protection circuit as claimed in claim 1, further comprising: a second charging transistor having a gate terminal and a first terminal; and a third resistor connected between the gate terminal and the first terminal of the second charging transistor, wherein a second terminal of the second charging transistor is electrically connected to the first terminal of the first charging transistor, and wherein the gate terminal of the second charging transistor is electrically connected to the gate terminal of the first charging transistor. ### Claim 3 (depends on 2) The battery protection circuit as claimed in claim 2, wherein the current voltage converter includes: a first transistor including a first terminal electrically connected to a second terminal of the first resistor; a second transistor including a first terminal electrically connected to a second terminal of the first transistor; and a fourth resistor including a first terminal electrically connected to a second terminal of the second transistor and a second terminal electrically connected to the gate terminal of the first charging transistor, the gate terminal of the second charging transistor, and the charging control terminal. ### Claim 4 (depends on 3) The battery protection circuit as claimed in claim 3, wherein: the voltage source includes a capacitor, and the capacitor is electrically connected to positive electrode of a battery cell to maintain a voltage. ### Claim 5 (depends on 4) The battery protection circuit as claimed in claim 4, wherein: the charging controller includes a power-supply terminal, and the charging controller receives power from the voltage source through the power-supply terminal to generate the charging control current. ### Claim 6 (depends on 5) The battery protection circuit as claimed in claim 5, wherein the voltage source includes a diode and a fifth resistor. ### Claim 7 (depends on 5) The battery protection circuit as claimed in claim 5, wherein a first terminal of the power-supply terminal and the first terminal of the first resistor are electrically connected to a first terminal of the capacitor. ### Claim 8 (depends on 7) The battery protection circuit as claimed in claim 7, wherein: the first transistor is enabled when the charging control current is in an on level and the first charging transistor and the second charging transistor are enabled. ### Claim 9 (depends on 8) The battery protection circuit as claimed in claim 8, wherein the second transistor is enabled when the charging control current is in an off level and the first charging transistor and the second charging transistor are disabled. ### Claim 10 (depends on 3) The battery protection circuit as claimed in claim 3, wherein the second resistor has a resistance value greater than that of the fourth resistor. ### Claim 11 (depends on 1) The battery protection circuit as claimed in claim 1, wherein the second resistor has a resistance value greater than that of the first resistor. ### Claim 12 A battery protection circuit, comprising: a first resistor connected to a voltage source; a first charging transistor connected to a battery terminal; a second resistor connected to the first charging transistor; a controller connected to the voltage source to supply a charging control current; and a converter to connect the voltage source to the first charging transistor based on the charging control current, wherein the first resistor has a resistance value less than a resistance value of the second resistor and wherein a time constant of the first charging transistor is based on the resistance value of the first resistor. ### Claim 13 (depends on 12) The battery protection circuit as claimed in claim 12, further comprising: a second charging transistor; and a third resistor connected to the second charging transistor, wherein a gate terminal of the first charging transistor and a gate terminal of the second charging transistor are connected to the converter. ### Claim 14 (depends on 13) The battery protection circuit as claimed in claim 13, wherein the resistance value of the first resistor is less than a resistance value of the third resistor. ### Claim 15 (depends on 13) The battery protection circuit as claimed in claim 13, wherein the converter includes: a first transistor connected to the first resistor; a second transistor connected between the first transistor and the second resistor and the third resistor; and a fourth resistor connected between the controller and gate terminals of the first and second transistors.