WO2023202550A1 - 反激电源电路、电路板和终端设备 - Google Patents

反激电源电路、电路板和终端设备 Download PDF

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Publication number
WO2023202550A1
WO2023202550A1 PCT/CN2023/088853 CN2023088853W WO2023202550A1 WO 2023202550 A1 WO2023202550 A1 WO 2023202550A1 CN 2023088853 W CN2023088853 W CN 2023088853W WO 2023202550 A1 WO2023202550 A1 WO 2023202550A1
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Prior art keywords
circuit
boost
diode
sub
flyback
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PCT/CN2023/088853
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English (en)
French (fr)
Inventor
邓国健
蒙德荣
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广州视源电子科技股份有限公司
广州视琨电子科技有限公司
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Publication of WO2023202550A1 publication Critical patent/WO2023202550A1/zh

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—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

Definitions

  • the embodiments of the present application relate to the field of power supply technology, and in particular to flyback power supply circuits, circuit boards and terminal equipment.
  • This application provides a flyback power supply circuit, circuit board and terminal equipment to solve the technical problem of low efficiency of existing power supply circuits with PFC modules.
  • embodiments of the present application provide a flyback power supply circuit, including a commutator circuit, a boost subcircuit, a boost auxiliary subcircuit and a flyback subcircuit;
  • the input end of the rectifier circuit is connected to the AC power supply, and the output end of the rectifier circuit is connected to the input end of the flyback circuit;
  • the output terminal of the rectifier circuit is connected to the output terminal of the boost sub-circuit through the fourth diode, the input terminal of the boost sub-circuit is connected to the output terminal of the boost auxiliary sub-circuit, and the input terminal of the boost auxiliary sub-circuit is connected to the inverter.
  • the auxiliary winding of the exciton circuit is connected.
  • embodiments of the present application provide a circuit board including the flyback power supply circuit of the first aspect.
  • embodiments of the present application provide terminal equipment, including the circuit board of the second aspect.
  • the above-mentioned flyback power supply circuit, circuit board and terminal equipment all include a commutator circuit, a boost sub-circuit, a boost auxiliary sub-circuit and a fly-back sub-circuit; the input end of the commutator circuit is connected to the AC power supply, and the output of the commutator circuit terminal is connected to the input terminal of the flyback circuit; the output terminal of the rectifier circuit is connected to the output terminal of the boost sub-circuit through the fourth diode, and the input terminal of the boost sub-circuit is connected to the output terminal of the boost auxiliary sub-circuit , the input end of the boost auxiliary subcircuit is connected to the auxiliary winding of the flyback circuit.
  • the auxiliary boost sub-circuit provides energy to the boost sub-circuit. Under the control of the boost sub-circuit, stable and efficient energy transmission can be ensured no matter what state the capacitor in the flyback circuit is in.
  • FIG. 1 is a schematic circuit structure diagram of a flyback power supply circuit provided by an embodiment of the present application.
  • Figure 2 is a schematic circuit structure diagram of an existing flyback power supply circuit without a PFC circuit.
  • Figure 3 is a schematic circuit structure diagram of an existing flyback power supply circuit with a PFC circuit.
  • FIG. 1 is a schematic circuit structure diagram of a flyback power supply circuit provided by an embodiment of the present application.
  • the flyback power supply circuit includes a commutator circuit 11, a boost sub-circuit 12, a boost auxiliary sub-circuit 13 and a flyback sub-circuit.
  • the input end of the rectifier circuit 11 is connected to the AC power supply, and the output end of the rectifier circuit 11 is connected to the input end of the flyback circuit 14;
  • the output terminal of the rectifier sub-circuit 11 is connected to the output terminal of the boost sub-circuit 12 through the fourth diode D4, and the input terminal of the boost sub-circuit 12 is connected to the output terminal of the boost auxiliary sub-circuit 13.
  • the boost auxiliary sub-circuit 13 The input terminal of the circuit 13 is connected to the auxiliary winding N3 of the flyback circuit 14 .
  • the flyback power supply circuit may not have a PFC circuit, or it may have a PFC circuit.
  • Figure 2 is a schematic circuit structure diagram of an existing flyback power supply circuit without a PFC circuit
  • Figure 3 is a schematic circuit structure diagram of an existing flyback power supply circuit with a PFC circuit.
  • the flyback power supply circuit in the prior art has a rectifier module 21 and a flyback module 22.
  • a flyback power supply circuit without a PFC circuit as shown in Figure 2, after the AC voltage is rectified, it is supplied to the electrolyzer through the diode D6. Capacitor E3 is charging.
  • rectifier bridge DB1 When the peak value of the input AC voltage is greater than the voltage of electrolytic capacitor E3, rectifier bridge DB1 will be forward-biased and conductive. When the peak value of the input AC voltage is less than the voltage of electrolytic capacitor E3, rectifier bridge DB1 will be reverse-biased and turned off. . Due to the large capacity of electrolytic capacitor E3, the voltage on electrolytic capacitor E3 will be maintained near the peak value of the rectified voltage. Therefore, the conduction angle of rectifier bridge DB1 is very small, and the input current is distorted, resulting in harmonics that cannot meet the requirements.
  • the flyback power supply circuit with a PFC circuit includes a rectifier module 21, a PFC module 23 and a flyback module 22. As shown in Figure 3, the PFC module 23 is added after rectification, resulting in a reduction in efficiency.
  • the entire flyback power supply circuit includes a commutator circuit 11, a boost sub-circuit 12, a boost auxiliary sub-circuit 13 and a flyback sub-circuit 14.
  • a commutator circuit 11 a boost sub-circuit 12
  • Boost auxiliary sub-circuit 13 a boost auxiliary sub-circuit 13
  • flyback sub-circuit 14 by adjusting the turns ratio relationship between the auxiliary winding N3 and the secondary side N2 in the flyback sub-circuit 14, an appropriate auxiliary voltage can be generated in the boost auxiliary sub-circuit 13 for providing Boost sub-circuit 12 provides energy.
  • the output voltage of the boost sub-circuit 12 is set to the minimum valley voltage expected in the flyback circuit 14 .
  • the boost sub-circuit 12 cooperates with the balanced capability transmission according to the voltage state in the flyback circuit 14. Overall, through the boost sub-circuit 12 and the boost auxiliary sub-circuit 13, the PF value can be effectively increased to ensure that the flyback circuit The energy of 14 is transmitted to the secondary side as
  • the flyback circuit 14 includes a first film capacitor C1 and a first MOS transistor Q1; the first end of the first film capacitor C1 and the output end of the commutator circuit 11 and the flyback circuit 14
  • the first end of the primary side N1 is connected; the second end of the first film capacitor C1 and the source of the first MOS transistor Q1 are both connected to ground, and the drain of the first MOS transistor Q1 is connected to the second end of the primary side N1.
  • the boost sub-circuit 12 includes a BOOST chip and a second electrolytic capacitor E2; the cathode of the fourth diode D4 is connected to the output end of the rectifier sub-circuit 11, and the anode of the fourth diode D4 Connected to the output terminal of the BOOST chip and the anode of the second electrolytic capacitor E2, the second electrolytic capacitor The cathode of E2 is connected to ground.
  • the boost auxiliary sub-circuit 13 includes a second diode D2 and a first electrolytic capacitor E1; the anode of the second diode D2 is connected to the first end of the auxiliary winding N3.
  • the cathode of the diode D2 is connected to the input terminal of the BOOST chip and the anode of the first electrolytic capacitor E1; the cathode of the first electrolytic capacitor E1 and the second terminal of the auxiliary winding N3 are both grounded.
  • FIG. 1 shows a comprehensive implementation of the above circuit in the same specific embodiment.
  • the capacitor in the flyback circuit 14 is the first film capacitor C1
  • the output voltage of the boost sub-circuit 12 Set to the expected minimum valley voltage of the first film capacitor C1.
  • the fourth diode D4 When the voltage of the AC input flyback power circuit is greater than the voltage of the second electrolytic capacitor E2 during a power frequency cycle, the fourth diode D4 does not conduct. Since the capacity of the first film capacitor C1 is small, the first film capacitor The voltage on C1 follows the AC input voltage, and the rectifier bridge D1 in the rectifier circuit 11 is always turned on. At this time, the conduction angle of the rectifier bridge D1 is large, and the PF value of the flyback power supply circuit is high. Under the control of EN in the boost sub-circuit 12, the boost sub-circuit 12 is started at this stage to replenish energy for the second electrolytic capacitor E2.
  • the fourth diode D4 When the voltage of the AC input flyback power supply circuit is greater than the voltage of the second electrolytic capacitor E2 during a power frequency cycle, the fourth diode D4 is turned on, and the second electrolytic capacitor E2 is connected in parallel with the first film capacitor C1, which is the output of the subsequent stage. provide energy. As the AC voltage decreases, the rectifier bridge D1 in the commutator circuit 11 is turned off. Since the second electrolytic capacitor E2 has a larger capacity, it can maintain the valley voltage of the first film capacitor C1 and reduce the current stress of the rear-stage flyback circuit 14. Under the control of EN in the boost sub-circuit 12, the boost sub-circuit 12 stops working at this stage to ensure that all energy of the flyback circuit 14 is transmitted to the secondary side N2.
  • the first electrolytic capacitor E1 and/or the second electrolytic capacitor E2 are aluminum electrolytic capacitors.
  • Aluminum electrolytic capacitors are made of an aluminum cylinder as the negative electrode, with a liquid electrolyte inside, and a curved aluminum strip inserted as the positive electrode. After DC voltage treatment, an oxide film is formed on the positive electrode as a dielectric.
  • the aluminum electrolytic capacitor has a large capacity. Can provide a wider range of support.
  • the antiexciton circuit 14 in this solution also includes a secondary side N2, and the secondary side N2 is a variable coil.
  • the auxiliary winding N3 in this solution can also be a variable coil.
  • the present application further provides a circuit board, including the flyback power circuit in any of the above embodiments.
  • this application also provides a terminal device, including the aforementioned circuit board.
  • circuit boards and end equipment correspond to the same beneficial effects as flyback power circuits.
  • terminal equipment such as televisions and liquid crystal display devices.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本申请实施例公开了反激电源电路、电路板和终端设备，其均包括整流子电路、升压子电路、升压辅助子电路和反激子电路；整流子电路的输入端接入交流电源，整流子电路的输出端与反激子电路的输入端相连；整流子电路的输出端通过第四二极管与升压子电路的输出端相连，升压子电路的输入端与升压辅助子电路的输出端相连，升压辅助子电路的输入端与反激子电路的辅助绕组相连。通过辅助升压子电路为升压子电路提供能量，在升压子电路的控制下，不管反激电路中的电容处于何种状态，均能保证能量的稳定高效传输。

Description

反激电源电路、电路板和终端设备
本申请要求于2022年4月21日提交中国专利局、申请号为202220949539.1、主题名称为“反激电源电路、电路板和终端设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及电源技术领域，尤其涉及反激电源电路、电路板和终端设备。
背景技术
在电子终端设备中，电源很大程度上影响着电子终端设备的使用寿命和使用体验。为保证供电质量，通常会在电源处理中通过各种方式减少电流畸变，抑制谐波。
现有的电源例如无PFC(Power Factor Correction，功率因数校正)电路的反激电源由整流模块、反激模块等组成。交流电压经过整流后进行供电，在现有的电源实现方案中，整流桥的导通角非常小，输入电流畸变，导致谐波无法满足要求。
在电视领域，电视整机功率大于75W时，法规对谐波有要求，需要进一步增加PFC电路来改善谐波，常规带PFC模块的电源包括整流模块、PFC模块、反激模块等。由于在整流后增加了PFC模块，因而导致电路效率的降低。
申请内容
本申请提供了反激电源电路、电路板和终端设备，以解决现有带PFC模块的电源电路效率较低的技术问题。
第一方面，本申请实施例提供了反激电源电路，包括整流子电路、升压子电路、升压辅助子电路和反激子电路；
整流子电路的输入端接入交流电源，整流子电路的输出端与反激子电路的输入端相连；
整流子电路的输出端通过第四二极管与升压子电路的输出端相连，升压子电路的输入端与升压辅助子电路的输出端相连，升压辅助子电路的输入端与反 激子电路的辅助绕组相连。
第二方面，本申请实施例提供了电路板，包括第一方面的反激电源电路。
第三方面，本申请实施例提供了终端设备，包括第二方面的电路板。
上述反激电源电路、电路板和终端设备，均包括整流子电路、升压子电路、升压辅助子电路和反激子电路；整流子电路的输入端接入交流电源，整流子电路的输出端与反激子电路的输入端相连；整流子电路的输出端通过第四二极管与升压子电路的输出端相连，升压子电路的输入端与升压辅助子电路的输出端相连，升压辅助子电路的输入端与反激子电路的辅助绕组相连。通过辅助升压子电路为升压子电路提供能量，在升压子电路的控制下，不管反激电路中的电容处于何种状态，均能保证能量的稳定高效传输。
附图说明
图1为本申请实施例提供的一种反激电源电路的电路结构示意图。
图2为现有无PFC电路的反激电源电路的电路结构示意图。
图3为现有带PFC电路的反激电源电路的电路结构示意图。
具体实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是，此处所描述的具体实施例用于解释本申请，而非对本申请的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本申请相关的部分而非全部结构。
需要注意的是，由于篇幅所限，本申请说明书没有穷举所有可选的实施方式，本领域技术人员在阅读本申请说明书后，应该能够想到，只要技术特征不互相矛盾，那么技术特征的任意组合均可以构成可选的实施方式。
下面对各实施例进行详细说明。
图1为本申请实施例提供一种反激电源电路的电路结构示意图，如图所示，该反激电源电路包括整流子电路11、升压子电路12、升压辅助子电路13和反激子电路14；
整流子电路11的输入端接入交流电源，整流子电路11的输出端与反激子电路14的输入端相连；
整流子电路11的输出端通过第四二极管D4与升压子电路12的输出端相连，升压子电路12的输入端与升压辅助子电路13的输出端相连，升压辅助子 电路13的输入端与反激子电路14的辅助绕组N3相连。
在现有技术中，反激电源电路可没有PFC电路，也可以有PFC电路。具体请参考图2和图3，其中图2为现有无PFC电路的反激电源电路的电路结构示意图，图3为现有带PFC电路的反激电源电路的电路结构示意图。整体上，现有技术中的反激电源电路都有整流模块21和反激模块22，对于无PFC电路的反激电源电路，如图2所示，交流电压经过整流后，通过二极管D6给电解电容E3充电，当输入交流电压的峰值大于电解电容E3的电压时，整流桥DB1才会正偏导通，在当输入交流电压的峰值小于电解电容E3的电压时，整流桥DB1会反偏截止。由于电解电容E3容量较大，电解电容E3上的电压会维持在整流后电压的峰值附近，因而整流桥DB1的导通角非常小，输入电流畸变，导致谐波无法满足要求。
对于法规对谐波指标有要求的终端设备，例如应用于电视机的反激电源电路，整机功率大于75W，需要增加PFC电路，即如图3所示的有PFC电路的反激电源电路，以整体改善谐波。即有PFC电路的反激电源电路包括整流模块21、PFC模块23和反激模块22，如图3所示，在整流后增加了PFC模块23，导致效率的降低。
在本方案中，如图1所示，整个反激电源电路包括整流子电路11、升压子电路12、升压辅助子电路13和反激子电路14。根据实际应用场景下的电路相关参数要求，通过调整反激子电路14中辅助绕组N3和副边N2的匝比关系，可以在升压辅助子电路13中产生一个适当的辅助电压，用于为升压子电路12提供能量。升压子电路12的输出电压设定为反激子电路14中预期最小的谷底电压。通过升压子电路12根据反激子电路14中的电压状态，配合平衡能力传输，整体上，通过升压子电路12和升压辅助子电路13，可以有效提升PF值，保证反激子电路14的能量尽可能向副边传输。
在本方案的具体实现过程中，反激子电路14包括第一薄膜电容C1和第一MOS管Q1；第一薄膜电容C1的第一端与整流子电路11的输出端以及反激子电路14的原边N1的第一端相连；第一薄膜电容C1的第二端以及第一MOS管Q1的源极均接地，第一MOS管Q1的漏极与原边N1的第二端相连。
在另一具体的实现方案中，升压子电路12包括BOOST芯片和第二电解电容E2；第四二极管D4的阴极与整流子电路11的输出端相连，第四二极管D4的阳极与BOOST芯片的输出端以及第二电解电容E2的阳极相连，第二电解电 容E2的阴极接地。
基于升压子电路12的具体实现方案，升压辅助子电路13包括第二二极管D2和第一电解电容E1；第二二极管D2的阳极与辅助绕组N3的第一端相连，第二二极管D2的阴极与BOOST芯片的输入端以及第一电解电容E1的阳极相连；第一电解电容E1的阴极以及辅助绕组N3的第二端均接地。
图1所示即为以上电路在同一具体实施例中的综合实现，在该综合实现的实施例中，反激子电路14中的电容为第一薄膜电容C1，升压子电路12的输出电压设定为第一薄膜电容C1预期最小的谷底电压。
当交流电输入反激电源电路的一个工频周期内，电压大于第二电解电容E2电压时，第四二极管D4不导通，由于第一薄膜电容C1容量较小，此时第一薄膜电容C1上电压跟随交流电输入电压，且整流子电路11中的整流桥D1始终保持开通。此时整流桥D1导通角大，反激电源电路的PF值高。在升压子电路12中EN的控制下，在此阶段升压子电路12启动，为第二电解电容E2补充能量。
当交流电输入反激电源电路的一个工频周期内，电压大于第二电解电容E2电压时，第四二极管D4导通，第二电解电容E2与第一薄膜电容C1并联，为后级输出提供能量。随着交流电电压的下降，整流子电路11中整流桥D1截止，由于第二电解电容E2容量较大，可以维持第一薄膜电容C1谷底电压，可减轻后级反激子电路14的电流应力。在升压子电路12中EN的控制下，此阶段升压子电路12停止工作，保证反激子电路14所有能量都传输到副边N2。
需要说明的是，以上基于图1所示的具体电路只是一种示例性说明，其中任一子电路使用其他具体电路设计实现，均不脱离本方案的设计思路。而且本方案中有些现有技术的固定连接也未特别描述，例如BOOST芯片的接地引脚。另外，在图1中为画图方便，将辅助绕组N3划分到升压辅助子电路13中，实际也可以因为变压器T1划分到反激子电路14中。
在具体实现本方案时，第一电解电容E1和/或第二电解电容E2为铝电解电容。铝电解电容是由铝圆筒做负极，里面装有液体电解质，插入一片弯曲的铝带做正极制成，经过直流电压处理，正极片上形成一层氧化膜做介质，铝电解电容的容量大，能提供较大范围的支持。
本方案中的反激子电路14还包括副边N2，副边N2为可变线圈。本方案中的辅助绕组N3也可以为可变线圈。通过调整副边N2和/或辅助绕组N3的有效匝数，可以适应各种不同场景下的电源参数要求。
在上述实施例的基础上，本申请进一步提供一种电路板，包括前述任一实施例中的反激电源电路。
此外本申请还提供一种终端设备，包括前述的电路板。
应当理解，电路板和终端设备对应具有反激电源电路相同的有益效果。
在本方案中，终端设备例如电视机、液晶显示设备。
需要说明的是，本申请实施例中术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。
注意，上述仅为本申请的较佳实施例及所运用技术原理。本领域技术人员会理解，本申请不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本申请的保护范围。因此，虽然通过以上实施例对本申请进行了较为详细的说明，但是本申请不仅仅限于以上实施例，在不脱离本申请构思的情况下，还可以包括更多其他等效实施例，而本申请的范围由所附的权利要求范围决定。

Claims (14)

  1. 反激电源电路，其中，包括整流子电路、升压子电路、升压辅助子电路和反激子电路；
    所述整流子电路的输入端接入交流电源，所述整流子电路的输出端与所述反激子电路的输入端相连；
    所述整流子电路的输出端通过第四二极管与所述升压子电路的输出端相连，所述升压子电路的输入端与所述升压辅助子电路的输出端相连，所述升压辅助子电路的输入端与所述反激子电路的辅助绕组相连，当所述第四二极管不导通时，所述升压子电路启动以存储能量；当所述第四二极管导通时，所述升压子电路停止工作且通过存储的能量提供输出电压至所述反激子电路，以减轻所述反激子电路的电流应力。
  2. 根据权利要求1所述的反激电源电路，其中，所述反激子电路包括第一薄膜电容和第一MOS管；
    所述第一薄膜电容的第一端与所述整流子电路的输出端以及所述反激子电路的原边的第一端相连；所述第一薄膜电容的第二端以及所述第一MOS管的源极均接地，所述第一MOS管的漏极与所述原边的第二端相连，所述输出电压设定为所述第一薄膜电容的预期最小的谷底电压。
  3. 根据权利要求2所述的反激电源电路，其中，所述升压子电路包括BOOST芯片和第二电解电容，所述第二电解电容用于存储能量，并在所述第四二极管导通时，通过存储的能量提供所述输出电压给所述第一薄膜电容；
    所述第四二极管的阴极与所述整流子电路的输出端相连，所述第四二极管的阳极与所述BOOST芯片的输出端以及所述第二电解电容的阳极相连，所述第二电解电容的阴极接地。
  4. 根据权利要求3所述的反激电源电路，其中，所述升压辅助子电路包括第二二极管和第一电解电容；
    所述第二二极管的阳极与所述辅助绕组的第一端相连，所述第二二极管的阴极与所述BOOST芯片的输入端以及所述第一电解电容的阳极相连；
    所述第一电解电容的阴极以及所述辅助绕组的第二端均接地。
  5. 根据权利要求4所述的反激电源电路，其中，所述第一电解电容和/或第二电解电容为铝电解电容。
  6. 根据权利要求1-5任一项所述的反激电源电路，其中，所述反激子电路还包括副边，所述副边为可变线圈。
  7. 根据权利要求1-5任一项所述的反激电源电路，其中，所述辅助绕组为可变线圈。
  8. 电路板，其中，包括权利要求1-7任一项所述的反激电源电路。
  9. 终端设备，其中，包括权利要求8所述的电路板。
  10. 根据权利要求9所述的终端设备，其中，所述终端设备为电视机。
  11. 反激电源电路，其特征在于，包括整流子电路、第一薄膜电容、第四二极管、第二电解电容和变压器，其中：
    所述整流子电路，用于接入交流电输入电压；
    所述第四二极管，所述第四二极管的阳极与所述第二电解电容的阳极连接，所述第四二极管的阴极与所述第一薄膜电容的第一端连接；
    所述第二电解电容，所述第二电解电容的阴极接地，所述第二电解电容用于在所述第四二极管不导通时存储能量；
    所述第一薄膜电容，用于通过第一端接收所述整流子电路的输出电压，并在所述第四二极管导通时，接收所述第二电解电容通过存储的能量提供的输出电压，所述输出电压设定为所述第一薄膜电容预期最小的谷底电压；
    所述变压器，包括原边、副边和辅助绕组，所述原边连接于所述第一薄膜电容的第二端，所述辅助绕组用于在所述第四二极管不导通时为所述第二电解电容提供所述能量。
  12. 根据权利要求11所述的反激电源电路，其特征在于，还包括第二二极管、第一电解电容和BOOST芯片，第二二极管的阳极与辅助绕组的第一端相连，第二二极管的阴极与BOOST芯片的输入端以及第一电解电容的阳极相连；第一电解电容的阴极以及辅助绕组的第二端均接地。
  13. 根据权利要求12所述的反激电源电路，其特征在于，所述BOOST芯片包括EN端，在所述第四二极管不导通时，通过所述EN端控制所述BOOST升压芯片停止工作。
  14. 根据权利要求11至13任一所述的反激电源电路，其特征在于，还包括第一MOS管，第一MOS管Q1的源极接地，第一MOS管Q1的漏极与所述原边的第二端相连。
PCT/CN2023/088853 2022-04-21 2023-04-18 反激电源电路、电路板和终端设备 WO2023202550A1 (zh)

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