This paper proposes a design and control approach to parallel resonant converter(PRC) based battery chargers.The proposed approach is particularly suitable for the constant-current constant-voltage(CC-CV)charging meth...This paper proposes a design and control approach to parallel resonant converter(PRC) based battery chargers.The proposed approach is particularly suitable for the constant-current constant-voltage(CC-CV)charging method, which is the most commonly utilized one.Since the PRC is operated at two different frequencies for each CC and CV charging modes, this approach eliminates the need for complicated control techniques such as the frequency-control and phase-shift-control.The proposed method not only simplifies the design and implementation processes of the converter unit but also simplifies the design of output filter configuration and decreases the number of the required components for the control of the charger.The proposed method is confirmed by two experimental setups.The results show that the designed charger circuit ensured a very stable constant current in CC charging phase, where the charging current is fixed to 1.75 A.Although a voltage increase in CV phase is observed, the charger circuit is able to decrease the charging current to 0.5 A in CV phase, as depicted in battery data-sheet.The efficiency of the charger is figured out to be in the range of 86%-93% in the first setup, while it is found to be in the range of 78%-88% in the second setup,where a high frequency transformer is employed.展开更多
由恒压/恒流式开关电源被广泛用于电池充电器中。但传统的电路设计需要使用许多元器件,不仅电路复杂,而且性能较差。介绍了一种专用的 LinkSwitch 系列恒压/恒流式单片开关电源,具有性能先进、电路简单、成本低廉等优点,适合构成4 W 以...由恒压/恒流式开关电源被广泛用于电池充电器中。但传统的电路设计需要使用许多元器件,不仅电路复杂,而且性能较差。介绍了一种专用的 LinkSwitch 系列恒压/恒流式单片开关电源,具有性能先进、电路简单、成本低廉等优点,适合构成4 W 以下的各种电池充电器或电源适配器。展开更多
A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a...A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee point of the primary auxiliary winding voltage. Furthermore, an internal digital compensator eliminates the need for external loop compensation components while achieving excellent line and load regulation. The controller could output both constant voltage and constant current depending on the load current. Pulse width modulation and pulse frequency modulation are used in constant voltage mode while quasi-resonant control is used in constant current mode. The digital controller is validated by using FPGA.展开更多
The conversion from constant current(CC)to constant voltage(CV)is one of the key technologies of CC underwater observatory systems.A shunt regulator with high stability and high reliability is usually used.Application...The conversion from constant current(CC)to constant voltage(CV)is one of the key technologies of CC underwater observatory systems.A shunt regulator with high stability and high reliability is usually used.Applications,however,are limited by high heat dissipation and low efficiency.In this paper,with an improved shunt regulation method,a novel concept of stepless power reconfiguration(SPR)for the CC/CV module is proposed.In cases with stable or slowly changing load,two modes of CC/CV conversion are proposed to reduce unnecessary power loss of the shunt regulator while being able to retain any operatorpreset power margin in the system:(1)the manual SPR(MSPR)method based on single-loop control method;(2)the automatic SPR(ASPR)method based on inner-outer loop control method.The efficiency of the system is analyzed.How to select some key parameters of the system is discussed.Experimental results show that MSPR and ASPR are both effective and practical methods to reduce heat dissipation and improve the efficiency of the CC/CV module,while the high stability of the shunt regulator remains.展开更多
文摘This paper proposes a design and control approach to parallel resonant converter(PRC) based battery chargers.The proposed approach is particularly suitable for the constant-current constant-voltage(CC-CV)charging method, which is the most commonly utilized one.Since the PRC is operated at two different frequencies for each CC and CV charging modes, this approach eliminates the need for complicated control techniques such as the frequency-control and phase-shift-control.The proposed method not only simplifies the design and implementation processes of the converter unit but also simplifies the design of output filter configuration and decreases the number of the required components for the control of the charger.The proposed method is confirmed by two experimental setups.The results show that the designed charger circuit ensured a very stable constant current in CC charging phase, where the charging current is fixed to 1.75 A.Although a voltage increase in CV phase is observed, the charger circuit is able to decrease the charging current to 0.5 A in CV phase, as depicted in battery data-sheet.The efficiency of the charger is figured out to be in the range of 86%-93% in the first setup, while it is found to be in the range of 78%-88% in the second setup,where a high frequency transformer is employed.
文摘A digital controller IC for the flyback converter with primary-side feedback is proposed. The controller is used for adapter charger or LED driver applications. To obtain high accuracy for the primary-side feedback, a digital primary-side sensing technology is adopted, which can auto-track the knee point of the primary auxiliary winding voltage. Furthermore, an internal digital compensator eliminates the need for external loop compensation components while achieving excellent line and load regulation. The controller could output both constant voltage and constant current depending on the load current. Pulse width modulation and pulse frequency modulation are used in constant voltage mode while quasi-resonant control is used in constant current mode. The digital controller is validated by using FPGA.
基金Project supported by the National Natural Science Foundation of China(No.51979246)the Ningbo Science and Technology Innovation 2025 Major Special Project,China(No.2020Z075)。
文摘The conversion from constant current(CC)to constant voltage(CV)is one of the key technologies of CC underwater observatory systems.A shunt regulator with high stability and high reliability is usually used.Applications,however,are limited by high heat dissipation and low efficiency.In this paper,with an improved shunt regulation method,a novel concept of stepless power reconfiguration(SPR)for the CC/CV module is proposed.In cases with stable or slowly changing load,two modes of CC/CV conversion are proposed to reduce unnecessary power loss of the shunt regulator while being able to retain any operatorpreset power margin in the system:(1)the manual SPR(MSPR)method based on single-loop control method;(2)the automatic SPR(ASPR)method based on inner-outer loop control method.The efficiency of the system is analyzed.How to select some key parameters of the system is discussed.Experimental results show that MSPR and ASPR are both effective and practical methods to reduce heat dissipation and improve the efficiency of the CC/CV module,while the high stability of the shunt regulator remains.
