US5355294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unity power factor control for dual active bridge converter
Assignee: General Electric Co
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Filing: 1992-11-25
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Granted: 1994-10-11
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Expires: 2012-11-25
Abstract
Abstract A dual active bridge converter, including high-frequency transformer-coupled input and output bridge converters, receives a rectified ac line voltage via a rectifier acting in a resistive mode and a small, high-frequency filter capacitor. A phase angle controller controls a phase shift between the voltages across the transformer windings such that high-efficiency dc-to-dc conversion is achieved, while maintaining unity power factor at the ac input, using high-density circuitry with small filter components and without adding additional front-end power factor correction circuitry.
Inventors
- 👤 Rik W. A. A. De Doncker
- 👤 Mustansir H. Kheraluwala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:46
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M1/4258; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/33569; H02M3/33576; H02M3/33584; Y; Y02; Y02B; Y02B70/00; Y02B70/10; Y02P; Y02P80/00; Y02P80/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
244 words
A method for controlling a dual active bridge converter with an input ac line rectifier to operate at unity power factor, said dual active bridge converter comprising an input converter transformer-coupled to an output converter, said input and output converters each comprising a plurality of switching devices arranged in a bridge configuration, said method comprising the steps of: said input ac line rectifier rectifying an ac line voltage; filtering said rectified ac line voltage to provide a high-frequency filtered input dc voltage pulsating at twice the ac line frequency; said input converter converting said high-frequency filtered input dc voltage to a high-frequency ac voltage; transforming said high-frequency ac voltage via the transformer coupling between said input and output converters to provide a transformed high-frequency ac voltage to said output converter, said output converter converting said high-frequency ac voltage to a dc output voltage; and controlling the switching devices of said input and output converters so as to control a phase difference between said high-frequency ac voltage and said transformed high-frequency ac voltage in order to regulate said dc output voltage while providing unity power factor, said dual active bridge converter being controlled according to the expression: ##EQU8## where f represents said phase difference, I p represents peak ac output current from said input converter, X L represents a leakage reactance of said transformer coupling, V out represents said dc output voltage, ω represents ac line frequency in radians per second, and t represents time.
Claim 2
Independent Claim
244 words
A method for controlling a dual active bridge converter with an input ac line rectifier to operate at unity power factor, said dual active bridge converter comprising an input converter transformer-coupled to an output converter, said input and output converters each comprising a plurality of switching devices arranged in a bridge configuration, said method comprising the steps of: said input ac line rectifier rectifying an ac line voltage; filtering said rectified ac line voltage to provide a high-frequency filtered input dc voltage pulsating at twice the ac line frequency; said input converter converting said high-frequency filtered input dc voltage to a high-frequency ac voltage; transforming said high-frequency ac voltage via the transformer coupling between said input and output converters to provide a transformed high-frequency ac voltage to said output converter, said output converter converting said high-frequency ac voltage to a dc output voltage; and controlling the switching devices of said input and output converters so as to control a phase difference between said high-frequency ac voltage and said transformed high-frequency ac voltage in order to regulate said dc output voltage while providing unity power factor, said dual active bridge converter being controlled according to the expression: ##EQU8## where f represents said phase difference, I p represents peak ac output current from said input converter, X L represents a leakage reactance of said transformer coupling, V out represents said dc output voltage, ω represents ac line frequency in radians per second, and t represents time.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said input rectifier comprises a diode rectifier bridge.
Claim 4
Dependent Claim
247 words
A dual active bridge converter system, comprising: an input rectifier for receiving an ac line voltage and rectifying said ac line voltage; a high-frequency capacitor coupled across said input rectifier for filtering the rectified ac line voltage and providing a high-frequency filtered input dc voltage pulsating at twice the ac line frequency; an input converter comprising a plurality of switching devices arranged in a bridge configuration for converting said high-frequency filtered input dc voltage to a high-frequency ac voltage; transformer coupling means for coupling said input converter to an output converter, said transformer coupling means including a primary winding for receiving said high-frequency ac voltage and a secondary winding for providing a transformed high-frequency ac voltage to said output converter, said output converter comprising a plurality of switching devices arranged in a bridge configuration for converting said high-frequency ac voltage to a dc output voltage; and control means for controlling the switching devices of said input and output converters so as to control a phase difference between said high-frequency ac voltage and said transformed high-frequency ac voltage in order to regulate said dc output voltage while providing unity power factor, said control means operating according to the expression: ##EQU9## where f represents said phase difference, I p represents peak ac output current from said input converter, X L represents a leakage reactance of said transformer coupling means, V out represents said dc output voltage, ω represents ac line frequency in radians per second, and t represents time.
Claim 5
Dependent Claim
247 words
A dual active bridge converter system, comprising: an input rectifier for receiving an ac line voltage and rectifying said ac line voltage; a high-frequency capacitor coupled across said input rectifier for filtering the rectified ac line voltage and providing a high-frequency filtered input dc voltage pulsating at twice the ac line frequency; an input converter comprising a plurality of switching devices arranged in a bridge configuration for converting said high-frequency filtered input dc voltage to a high-frequency ac voltage; transformer coupling means for coupling said input converter to an output converter, said transformer coupling means including a primary winding for receiving said high-frequency ac voltage and a secondary winding for providing a transformed high-frequency ac voltage to said output converter, said output converter comprising a plurality of switching devices arranged in a bridge configuration for converting said high-frequency ac voltage to a dc output voltage; and control means for controlling the switching devices of said input and output converters so as to control a phase difference between said high-frequency ac voltage and said transformed high-frequency ac voltage in order to regulate said dc output voltage while providing unity power factor, said control means operating according to the expression: ##EQU9## where f represents said phase difference, I p represents peak ac output current from said input converter, X L represents a leakage reactance of said transformer coupling means, V out represents said dc output voltage, ω represents ac line frequency in radians per second, and t represents time.
Claim 6
Dependent Claim
17 words
The dual active bridge converter of claim 3 wherein said input rectifier comprises a diode rectifier bridge.
References Cited (Backward Citations)
US5027264A
Cited
US5224025A
Cited
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