# US 12,184,181 B2 · Power supply circuit

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- Number: US 12,184,181 B2
- Document ID: US12184181B2
- Status: Granted
- Kind: B2
- Application number: 17/845,079
- Filed: 2022-06-21
- Published: 2023-08-24
- Granted: 2024-12-31
- Earliest claimed: 2022-02-18
- Assignees: Changxin Memory Technologies, Inc.
- Applicants: Changxin Memory Technologies, Inc.
- Inventors: Yuru Zhu; Yan Huang; Xinhua Cai
- Web page: https://patentgrep.com/patent/US12184181B2

## CPC

- G11C 11/4074: Power supply or voltage generation circuits, e.g. bias voltage generators, substrate voltage generators, back-up power, power control circuits
- H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop}
- G11C 5/147: {Voltage reference generators, voltage or current regulators; Internally lowered supply levels; Compensation for voltage drops (G11C5/141 takes precedence)}
- G11C 29/56: External testing equipment for static stores, e.g. automatic test equipment [ATE]; Interfaces therefor
- H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)}
- H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M 1/126: {using passive filters}
- H02M 1/14: Arrangements for reducing ripples from DC input or output
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 1/327: {against abnormal temperatures}
- H02M 3/135: using semiconductor devices only
- H02M 3/28: using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M 7/12: using discharge tubes with control electrode or semiconductor devices with control electrode
- G11C 2029/0407: {on power on}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- G11C: STATIC STORES (semiconductor memory devices H10B)
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A power supply circuit includes: power supplying module configured to provide DC voltage; transformer module including primary-side first winding connected to power supplying module and secondary-side winding coupled to primary-side first winding; switch module having one end connected to primary-side first winding and the other end connected to grounding terminal; control module connected to switch module, where control module is configured to control switch module to have different switching frequencies and/or different turning-off times, to enable first pulse voltages with different duty cycles to be formed on primary-side first winding, and second pulse voltages with different duty cycles to be subsequently generated on secondary-side winding; and voltage conversion module having input terminal connected to secondary-side winding and output terminal connected to voltage output terminal of power supply circuit, where voltage conversion module is configured to convert second pulse voltages with different duty cycles on secondary-side winding into respective DC voltages.

## Claims

### Claim 1

A power supply circuit, comprising:
a power supplying module, configured to provide a first direct current (DC) voltage, comprising: a first rectifying unit, configured to rectify a mains voltage; and a first filtering unit, connected to the first rectifying unit and configured to filter a rectified voltage;
a transformer module, comprising a primary side first winding connected to the power supplying module and a secondary side winding coupled to the primary side first winding;
a switch module having one end connected to the primary side first winding and the other end connected to a grounding terminal;
a control module, connected to the switch module, wherein the control module is configured to control the switch module to have different switching frequencies and/or different turning-off times, to enable first pulse voltages with different duty cycles to be formed on the primary side first winding, and second pulse voltages with different duty cycles to be subsequently generated on the secondary side winding; and
a voltage conversion module having an input terminal connected to the secondary side winding and an output terminal connected to a voltage output terminal of the power supply circuit, wherein the voltage conversion module is configured to convert the second pulse voltages with different duty cycles on the secondary side winding into respective DC voltages, and the voltage conversion module comprises a second rectifying unit, configured to rectify a voltage on the secondary side winding; and a second filtering unit, connected to the second rectifying unit and configured to filter a rectified voltage;
an additional filter circuit, constituted by an inductor and a first capacitor, configured to lower a voltage ripper of a second DC voltage output from the voltage output terminal.

### Claim 2 (depends on 1)

The power supply circuit of claim 1, comprising:
a comparison module, connected to the voltage output terminal and the control module and configured to compare each actual voltage output from the voltage output terminal with a respective target voltage, and feedback a comparison result to the control module,
wherein the control module is configured to adjust the switching frequency and/or the turning-off time of the switch module according to the comparison result.

### Claim 3 (depends on 2)

The power supply circuit of claim 2, wherein the comparison module comprises:
a reference unit, configured to generate a plurality of reference voltages, wherein each reference voltage is associated with a respective target voltage; and
a feedback unit, connected to the voltage output terminal, the reference unit and the control module,
wherein the feedback unit is configured to generate a feedback signal according to the actual voltage output from the voltage output terminal and the corresponding reference voltage generated by the reference unit, and the control module is configured to adjust the switching frequency and/or the turning-off time of the switch module according to the feedback signal.

### Claim 4 (depends on 3)

The power supply circuit of claim 3, wherein the feedback unit comprises an optocoupler device comprising a transmitter and a receiver, two ends of the transmitter being respectively connected to the voltage output terminal and the reference unit, and the receiver being connected to the control module.

### Claim 5 (depends on 3)

The power supply circuit of claim 3, wherein the reference unit comprises:
a reference power supply terminal, configured to provide a power supply to the reference unit; and
a voltage conversion sub-unit, connected to the reference power supply terminal and the feedback unit, and configured to convert the power supply voltage provided from the reference power supply terminal into a plurality of reference voltages and output the plurality of reference voltages to the feedback unit.

### Claim 6 (depends on 5)

The power supply circuit of claim 5, wherein the voltage conversion sub-unit comprises a voltage regulator, a first resistor, a second resistor, a third resistor, and a second capacitor,
wherein the voltage regulator has a control terminal connected to the feedback unit, a sampling terminal connected to the first resistor and the second resistor, and a grounding terminal;
the first resistor has one end connected to the reference power supply terminal, and the other end connected to the sampling terminal of the voltage regulator;
the second resistor has one end connected to the sampling terminal of the voltage regulator, and the other end grounded;
the third resistor has one end connected to the control terminal of the voltage regulator, and the other end connected to the second capacitor; and
the second capacitor has one end connected to the third resistor R8, and the other end connected to the sampling terminal of the voltage regulator.

### Claim 7 (depends on 1)

The power supply circuit of claim 1, wherein the switch module comprises a switch transistor.

### Claim 8 (depends on 1)

The power supply circuit of claim 1, wherein the switch module and the control module are disposed on a same control chip.

### Claim 9 (depends on 8)

The power supply circuit of claim 8, wherein the control chip further comprises a temperature detection module connected to the control module, the temperature detection module being configured to detect a temperature of the control chip, and the control module being configured to turn off the switch module in response to that the temperature of the control chip exceeds a preset temperature.

### Claim 10 (depends on 8)

The power supply circuit of claim 8, wherein the control chip further comprises a voltage detection module connected to the control module, the voltage detection module being configured to detect a power supply voltage of the control chip, and the control module being configured to turn off the switch module in response to that the power supply voltage of the control chip is beyond a preset voltage range.

### Claim 11 (depends on 8)

The power supply circuit of claim 8, wherein the transformer module further comprises a primary side second winding configured to provide a power supply voltage to the control chip.

### Claim 12 (depends on 1)

The power supply circuit of claim 1, further comprising:
an anti-shock module having one end connected to the power supplying module and the other end connected to the primary side first winding, and configured to provide a voltage releasing loop for the primary side first winding when the switch module is turned off.

### Claim 13 (depends on 1)

The power supply circuit of claim 1, wherein the power supply circuit is configured to implement power supplying in a manner of single-input multiple-output to system platforms for testing a Dynamic Random Access Memory (DRAM).