# US 12,184,182 B2 · Systems and methods for providing power to pulse-width-modulation controllers of power converters during normal operation

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,184,182 B2
- Document ID: US12184182B2
- Status: Granted
- Kind: B2
- Application number: 18/131,788
- Filed: 2023-04-06
- Published: 2023-12-07
- Granted: 2024-12-31
- Earliest claimed: 2020-09-04
- Assignees: On-Bright Electronics (Shanghai) Co., Ltd.
- Applicants: On-Bright Electronics (Shanghai) Co., Ltd.
- Inventors: Penglin Yang; Xiaomin Huang; Yuan Lin; Yun Sun
- Web page: https://patentgrep.com/patent/US12184182B2

## CPC

- H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop}
- H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters}
- H02M 1/0022: {the disturbance parameters being input voltage fluctuations}
- H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 1/36: Means for starting or stopping converters
- H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
- 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

Controller and method for a power converter. For example, the controller includes: a first terminal configured to receive a first voltage; a second terminal connected to a capacitor and biased to a second voltage; a voltage detector configured to receive the second voltage from the second terminal and generate a detection signal based at least in part on the second voltage; a charging controller configured to receive the detection signal and generate a first control signal based at least in part on the detection signal; and a charging current generator configured to receive the first voltage from the first terminal and receive the first control signal from the charging controller; wherein the voltage detector is further configured to: detect that the second voltage has decreased to a first predetermined threshold; and generate the detection signal indicating that the second voltage has decreased to the first predetermined threshold.

## Claims

### Claim 1

A controller for a power converter, the controller comprising:
a first terminal;
a second terminal connected to a capacitor and biased to a voltage;
a voltage detector configured to receive the voltage from the second terminal and generate a detection signal based at least in part on the voltage; and
a charging controller configured to receive the detection signal and generate a first control signal based at least in part on the detection signal;
wherein the voltage detector is further configured to:
detect that the voltage has decreased to a first predetermined threshold; and
generate the detection signal indicating that the voltage has decreased to the first predetermined threshold;
wherein the charging controller is further configured to:
in response to the detection signal indicating that the voltage has decreased to the first predetermined threshold, generate the first control signal indicating that a charging current is to be generated, the charging current configured to charge the capacitor associated with the voltage;
wherein the voltage detector is further configured to:
detect that the voltage has increased to a second predetermined threshold; and
generate the detection signal indicating that the voltage has increased to the second predetermined threshold;
wherein the second predetermined threshold is larger than the first predetermined threshold.

### Claim 2 (depends on 1)

The controller of claim 1 wherein:
the charging controller is further configured to:
in response to the detection signal indicating that the voltage has increased to the second predetermined threshold, generate the first control signal indicating that the charging current is not to be generated.

### Claim 3 (depends on 1)

The controller of claim 1 wherein:
the voltage decreases to the first predetermined threshold during normal operation after a startup process; and
the voltage increases to the second predetermined threshold during the normal operation.

### Claim 4 (depends on 3)

The controller of claim 3 wherein, during the startup process:
the voltage detector is further configured to:
detect that the voltage has not risen above a third predetermined threshold; and
generate the detection signal indicating that the voltage has not risen above the third predetermined threshold;
the charging controller is further configured to:
in response to the detection signal indicating that the voltage has not risen above the third predetermined threshold, generate the first control signal indicating that the charging current is to be generated, the charging current configured to charge the capacitor and raise the voltage.

### Claim 5 (depends on 4)

The controller of claim 4 wherein, during the startup process:
the voltage detector is further configured to:
detect that the voltage has risen above the third predetermined threshold; and
generate the detection signal indicating that the voltage has risen above the third predetermined threshold;
the charging controller is further configured to:
in response to the detection signal indicating that the voltage has risen above the third predetermined threshold, generate the first control signal indicating that the charging current is not to be generated.

### Claim 6 (depends on 5)

The controller of claim 5, and further comprising:
a circuit for undervoltage-lockout configured to:
in response to the voltage has risen above the third predetermined threshold, generating a second control signal indicating the startup process has ended; and
an internal control circuit configured to:
in response to the second control signal indicating the startup process has ended, power on one or more components of the controller to start the normal operation.

### Claim 7

A method for a power converter, the method comprising:
receiving a voltage associated with a capacitor;
generating a detection signal based at least in part on the voltage;
receiving the detection signal; and
generating a first control signal based at least in part on the detection signal;
wherein the generating a detection signal based at least in part on the voltage includes:
detecting that the voltage has decreased to a first predetermined threshold; and
generating the detection signal indicating that the voltage has decreased to the first predetermined threshold;
wherein the generating a first control signal based at least in part on the detection signal includes:
in response to the detection signal indicating that the voltage has decreased to the first predetermined threshold, generating the first control signal indicating that a charging current is to be generated, the charging current configured to charge the capacitor associated with the voltage;
wherein the generating a detection signal based at least in part on the voltage further includes:
detecting that the voltage has increased to a second predetermined threshold; and
generating the detection signal indicating that the voltage has increased to the second predetermined threshold;
wherein the second predetermined threshold is larger than the first predetermined threshold.