# US 12,183,527 B2 · Drive circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,527 B2 - Document ID: US12183527B2 - Status: Granted - Kind: B2 - Application number: 17/740,714 - Filed: 2022-05-10 - Published: 2022-08-25 - Granted: 2024-12-31 - Earliest claimed: 2020-05-29 - Assignees: Contemporary Amperex Technology (Hong Kong) Limited - Applicants: Contemporary Amperex Technology (Hong Kong) Limited - Inventors: Jirong Huo; Yanhui Fu; Le Chu; Changjian Liu - Web page: https://patentgrep.com/patent/US12183527B2 ## CPC - H01H 47/18: for introducing delay in the operation of the relay (short-circuited conducting sleeves, bands or discs H01H50/46) - H03K 17/0822: {in field-effect transistor switches} - B60L 3/0023: {Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train} - H01H 47/002: {Monitoring or fail-safe circuits} - H03K 17/284: in field effect transistor switches - H03K 17/687: the devices being field-effect transistors - H01H 47/325: {by switching regulator} - H03K 2217/0072: Low side switches, i.e. the lower potential [DC] or neutral wire [AC] being directly connected to the switch and not via the load - H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00) - 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) - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES ## Abstract Embodiments of this application relate to the field of electricity, and disclose a drive circuit. In some embodiments of this application, the drive circuit includes a low-side driver module and a delay module, the delay module is configured to output a delay signal of preset duration to the low-side driver module in a case that a control module is being reset; and the low-side driver module is configured to: according to on the delay signal of preset duration, maintain a first state within the preset duration, the first state being the same as a second state; where the second state is a working state of the low-side driver module before the control module is reset, and the second state includes being on or off. The embodiments can help avoid safety hazards caused by unexpected disconnection of a drive signal of the control module. ## Claims ### Claim 1 A drive circuit, wherein the drive circuit comprises a low-side driver module and a delay module; the delay module is configured to output a delay signal of preset duration to the low-side driver module in a case that a control module is being reset; and the low-side driver module is configured to: according to the delay signal of preset duration, maintain a first state within the preset duration, wherein the first state is the same as a second state; wherein the second state is a working state of the low-side driver module before the control module is reset, and the second state comprises being on or off, wherein the drive circuit is configured to drive a load, and the load is grounded through the low-side driver module; and the low-side driver module comprises a first low-side driver unit and a second low-side driver unit, wherein a first terminal of the first low-side driver unit and a first terminal of the second low-side driver unit are both connected to the load, a second terminal of the first low-side driver unit and a second terminal of the second low-side driver unit are grounded, the control module is connected to a control terminal of the first low-side driver unit, and the delay module is connected to a control terminal of the second low-side driver unit. ### Claim 2 (depends on 1) The drive circuit according to claim 1, wherein the delay module comprises a delay unit and a first pull-up unit; a first controlled terminal of the delay unit is connected to both the first pull-up unit and a first output terminal of the control module, a second controlled terminal of the delay unit is connected to a second output terminal of the control module, and an output terminal of the delay unit is connected to a control terminal of the second low-side driver unit; and the delay unit is configured to: when an electrical signal of a first level is detected at the first controlled terminal and an edge signal is detected at the second controlled terminal, output a delay signal of a second level; and when an electrical signal of a third level is detected at the first controlled terminal, output a delay signal of a fourth level; wherein the fourth level is a reverse level of the second level, the third level is a reverse level of the first level, and the second low-side driver unit is switched on when receiving an electrical signal of the second level and switched off when receiving an electrical signal of the fourth level. ### Claim 3 (depends on 2) The drive circuit according to claim 2, wherein in a case that the edge signal is a rising edge signal, the delay module further comprises a second pull-up unit, and the second pull-up unit is connected to the second controlled terminal of the delay unit. ### Claim 4 (depends on 2) The drive circuit according to claim 2, wherein the delay unit comprises N cascaded delay components; and first input terminals of all the delay components are mutually connected, where a joint serves as the first controlled terminal of the delay unit, a second input terminal of a 1st delay component is connected to the second controlled terminal of the delay unit, a second input terminal of an (i+1)th delay component is connected to an output terminal of an ith delay component, and an output terminal of an Nth delay component serves as the output terminal of the delay unit, wherein 1≤i