# US 12,184,166 B2 · Power conversion system with ripple injection and power conversion control method

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- Number: US 12,184,166 B2
- Document ID: US12184166B2
- Status: Granted
- Kind: B2
- Application number: 17/582,153
- Filed: 2022-01-24
- Published: 2023-06-08
- Granted: 2024-12-31
- Earliest claimed: 2021-12-02
- Assignees: Delta Electronics, Inc.
- Applicants: Delta Electronics, Inc.
- Inventors: Yu-Jen Lin; Terng-Wei Tsai; Chia-Hsiong Huang; Cheng-Chung Li; Chien-Hsi Wang
- Web page: https://patentgrep.com/patent/US12184166B2

## CPC

- H02M 1/4216: {operating from a three-phase input voltage (H02M1/4233 takes precedence)}
- H02J 3/01: Arrangements for reducing harmonics or ripples
- H02J 7/64: against overvoltage
- H02M 1/14: Arrangements for reducing ripples from DC input or output
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- 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
- 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)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A power conversion system with ripple injection includes an AC-DC conversion unit, a voltage regulation unit, at least one DC-DC conversion unit, at least one load, and a first control unit. The voltage regulation unit provides a DC link and receives one portion of an input power as an energy storage power. Each DC-DC conversion unit receives the other portion of the input power as an output power. The at least one load correspondingly receives the output power for being supplied power. The first control unit is coupled to the DC link, the at least one DC-DC conversion unit, and the at least one load. The first control unit controls the at least one DC-DC conversion unit to adjust a magnitude of a ripple of the output power to perform a ripple injection operation according to a magnitude of a ripple of the input power.

## Claims

### Claim 1

A power conversion system with ripple injection, comprising:
an AC-DC conversion unit, comprising a first input side and a first output side, the first input side configured to receive an AC power source to provide an input power,
a voltage regulation unit, coupled to the first output side, and configured to provide a DC link and receive one portion of the input power as an energy storage power,
at least one DC-DC conversion unit, each DC-DC conversion unit comprising a second input side and a second output side, the second input side coupled to the DC link, and configured to receive the other portion of the input power as an output power,
at least one load, coupled to the second output side, and configured to correspondingly receive the output power provided from the at least one DC-DC conversion unit for being powered supply, and
a first control unit, coupled to the DC link, the at least one DC-DC conversion unit, and the at least one load,
wherein the first control unit is configured to control the at least one DC-DC conversion unit to adjust a magnitude of a ripple of the output power to perform a ripple injection operation to the at least one load according to a magnitude of a ripple of the input power.

### Claim 2 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein when the first control unit determines that a DC link voltage is greater than or equal to a threshold voltage, the ripple injection operation is activated.

### Claim 3 (depends on 2)

The power conversion system with ripple injection as claimed in claim 2, wherein the at least one DC-DC conversion unit jointly evenly adjusts the magnitude of the ripple of the output power.

### Claim 4 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the at least one DC-DC conversion unit is under a constant-current operation, and the first control unit controls the at least one DC-DC conversion unit to perform a current ripple injection operation.

### Claim 5 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the at least one DC-DC conversion unit is under a constant-voltage operation, and the first control unit controls the at least one DC-DC conversion unit to perform a voltage ripple injection operation.

### Claim 6 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the first control unit determines a power ripple phase angle inputted to the DC link, and the ripple injection operation is activated according to the matched power ripple phase angle.

### Claim 7 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, further comprising:
a second control unit, coupled to the AC-DC conversion unit and the DC link, and configured to receive the AC power source,
wherein when the AC power source is a three-phase AC power source, the second control unit controls a three-phase current of an AC input current flowing into the AC-DC conversion to be balanced and even.

### Claim 8 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the AC-DC conversion unit is a power factor corrector.

### Claim 9 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the voltage regulation unit is a capacitor.

### Claim 10 (depends on 1)

The power conversion system with ripple injection as claimed in claim 1, wherein the at least one DC-DC conversion unit is a battery charger, and the at least one load is a DC rechargeable battery.

### Claim 11

A power conversion control method configured to operate a power conversion system, the power conversion system comprising:
an AC-DC conversion unit, configured to receive an AC power source to provide an input power,
a voltage regulation unit, configured to provide a DC link and receive one portion of the input power as an energy storage power,
at least one DC-DC conversion unit, each DC-DC conversion unit coupled to the DC link, and configured to receive the other portion of the input power as an output power,
at least one load, configured to correspondingly receive the output power provided from the at least one DC-DC conversion unit, and
a first control unit,
the power conversion control method comprising steps of:
(a) acquiring, by the first control unit, a DC link voltage of the DC link,
(b) performing, by the first control unit, a load control or both a ripple injection control and the load control according to a threshold voltage and the DC link voltage,
(c) providing, by the first control unit, a first DC-DC control command according to a load demand information and the DC link voltage when the first control unit performs both the ripple injection control and the load control, wherein the load demand information corresponds to a power extracted from the at least one DC-DC conversion unit required by the at least one load,
(d) providing, by the first control unit, a second DC-DC control command according to the load demand information when the first control unit performs the load control, and
(e) extracting, by the at least one DC-DC conversion unit, the power from the voltage regulation unit and performing a DC power conversion to supply the power required by the at least one load according to the first DC-DC control command or the second DC-DC control command provided by the first control unit.

### Claim 12 (depends on 11)

The power conversion control method as claimed in claim 11, wherein in step (b), activating the ripple injection control when the first control unit determines that the DC link voltage is greater than or equal to a threshold voltage.

### Claim 13 (depends on 12)

The power conversion control method as claimed in claim 12, wherein the at least one DC-DC conversion unit jointly evenly adjusts the magnitude of the ripple of the output power.

### Claim 14 (depends on 11)

The power conversion control method as claimed in claim 11, wherein the at least one DC-DC conversion unit is under a constant-current operation, and the first control unit controls the at least one DC-DC conversion unit to perform a current ripple injection control.

### Claim 15 (depends on 11)

The power conversion control method as claimed in claim 11, wherein the at least one DC-DC conversion unit is under a constant-voltage operation, and the first control unit controls the at least one DC-DC conversion unit to perform a voltage ripple injection control.

### Claim 16 (depends on 11)

The power conversion control method as claimed in claim 11, wherein the first control unit determines a power ripple phase angle inputted to the DC link, and the ripple injection control is activated according to the matched power ripple phase angle.

### Claim 17 (depends on 11)

The power conversion control method as claimed in claim 11, wherein the power conversion system further comprises:
a second control unit, coupled to the AC-DC conversion unit and the DC link, and configured to receive the AC power source,
wherein the power conversion control method further comprises a step of:
(f) controlling, by the second control unit, a three-phase current of an AC input current flowing into the AC-DC conversion to be balanced and even when the AC power source is a three-phase AC power source.