CN211352514U - A drive circuit with stable and efficient output and a lamp using the same - Google Patents

A drive circuit with stable and efficient output and a lamp using the same Download PDF

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CN211352514U
CN211352514U CN201921738893.4U CN201921738893U CN211352514U CN 211352514 U CN211352514 U CN 211352514U CN 201921738893 U CN201921738893 U CN 201921738893U CN 211352514 U CN211352514 U CN 211352514U
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李小祥
李小兵
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Guangdong OML Technology Co Ltd
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Abstract

The utility model discloses a stable and high-efficiency driving circuit and a lamp using the same, which comprises a PFC correction boost module, a switch power supply module and a feedback module, wherein the input end of the PFC correction boost module is electrically connected with an external power supply, the input end of the switch power supply module is electrically connected with the output end of the PFC correction boost module, the output end of the switch power supply module can be connected with an external load to supply power to the external load, the input end of the feedback module is electrically connected with the output end of the switch power supply module, the output end of the feedback module is electrically connected with the feedback end of the switch power supply module, the electric energy utilization efficiency is improved, and the switch power supply module is used for feedback voltage reduction driving, so that when high input power factors and low input current harmonics are obtained, the ripple of output voltage is smaller, the voltage adjustment is faster, and the instantaneous response to, the voltage within a certain range is output, and the voltage can be adjusted in time according to the grade of the accessed load, so that the work is stable.

Description

一种输出稳定且高效的驱动电路及应用其的灯具A drive circuit with stable and efficient output and a lamp using the same

技术领域technical field

本实用新型涉及电子电路,特别是一种驱动电路。The utility model relates to an electronic circuit, in particular to a driving circuit.

背景技术Background technique

传统的灯具驱动电路,一般来讲,一种驱动电路只能适配一种规格的灯具,对于不同规格的灯具,厂家必须要生产研发出多组驱动电路来跟灯具适配,从而造成生产制造上的麻烦,成本大大提高,对于用户来讲,在使用或者维修过程中,也必须按照规格来适配使用,非常不方便;同时,当不同规格的驱动电路与灯具强行搭配时,驱动电路不能自身调整,容易导致电路的功率因素大大降低,用电效率较低,并且灯具容易损坏。In the traditional lamp drive circuit, generally speaking, a drive circuit can only be adapted to a lamp of one specification. For lamps of different specifications, manufacturers must produce and develop multiple sets of drive circuits to match the lamps, resulting in manufacturing It is very troublesome and the cost is greatly increased. For users, in the process of use or maintenance, it must be adapted to the specifications, which is very inconvenient; at the same time, when the driving circuits of different specifications are forcibly matched with the lamps, the driving circuits cannot be used. Self-adjustment can easily lead to a great reduction in the power factor of the circuit, low power efficiency, and easy damage to the lamps.

实用新型内容Utility model content

本实用新型的目的在于至少解决现有技术中存在的技术问题之一,提供一种输出稳定且高效的驱动电路及应用其的灯具。The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a driving circuit with stable and efficient output and a lamp using the same.

本实用新型采用的技术方案是:The technical scheme adopted by the utility model is:

一种输出稳定且高效的驱动电路,包括:A drive circuit with stable output and high efficiency, including:

PFC校正升压模块,所述PFC校正升压模块的输入端与外部电源电性连接;PFC calibration boosting module, the input end of the PFC calibration boosting module is electrically connected to the external power supply;

开关电源模块,所述开关电源模块的输入端与所述PFC校正升压模块的输出端电性连接,所述开关电源模块的输出端能够与外部负载连接以为外部负载供电;a switching power supply module, the input end of the switching power supply module is electrically connected with the output end of the PFC correction and boosting module, and the output end of the switching power supply module can be connected with an external load to supply power to the external load;

反馈模块,所述反馈模块的输入端与所述开关电源模块的输出端电性连接,反馈模块的输出端与开关电源模块的反馈端电性连接。A feedback module, the input terminal of the feedback module is electrically connected with the output terminal of the switching power supply module, and the output terminal of the feedback module is electrically connected with the feedback terminal of the switching power supply module.

还包括整流滤波模块,所述整流滤波模块的输入端与外部交流电源电性连接,所述整流滤波模块的输出端与PFC校正升压模块的输出端电性连接。It also includes a rectification filter module, the input end of the rectifier filter module is electrically connected to the external AC power supply, and the output end of the rectifier filter module is electrically connected to the output end of the PFC correction boosting module.

所述PFC校正升压模块包括功率校正单元、输入电压反馈单元、第一输出电压反馈单元、第一输出电流反馈单元、第一电感以及第一开关单元;The PFC correction boosting module includes a power correction unit, an input voltage feedback unit, a first output voltage feedback unit, a first output current feedback unit, a first inductor and a first switch unit;

所述输入电压反馈单元的输入端分别与所述整流滤波模块的输出端以及第一电感的一端电性连接,所述输入电压反馈单元的输出端与所述功率校正单元的输入电压反馈端电性连接;The input end of the input voltage feedback unit is electrically connected to the output end of the rectification filter module and one end of the first inductor, respectively, and the output end of the input voltage feedback unit is electrically connected to the input voltage feedback end of the power correction unit. sexual connection;

所述第一电感的另一端分别与所述第一输出电压反馈单元的输入端、所述第一开关单元的输入端以及所述开关电源模块的输入端电性连接,第一输出电压反馈单元的输出端与所述功率校正单元的输出电压反馈端电性连接;The other end of the first inductor is respectively electrically connected to the input end of the first output voltage feedback unit, the input end of the first switching unit and the input end of the switching power supply module, and the first output voltage feedback unit The output terminal of the power correction unit is electrically connected to the output voltage feedback terminal of the power correction unit;

所述第一开关单元的输出端通过所述第一输出电流反馈单元接地;The output end of the first switch unit is grounded through the first output current feedback unit;

所述第一输出电流反馈单元的输出端与所述功率校正单元的输出电流反馈端电性连接;The output terminal of the first output current feedback unit is electrically connected to the output current feedback terminal of the power correction unit;

所述功率校正单元的控制输出端与所述第一开关单元的受控端电性连接。The control output end of the power calibration unit is electrically connected to the controlled end of the first switch unit.

所述PFC校正升压模块还包括储能单元以及二极管D8;The PFC correction boosting module further includes an energy storage unit and a diode D8;

所述储能单元的一端分别与第一电感的所述一端以及所述整流滤波模块的输出端电性连接;One end of the energy storage unit is respectively electrically connected to the one end of the first inductor and the output end of the rectification filter module;

所述二极管D8的正极与所述第一电感的所述另一端电性连接,所述二极管D8的负极分别与所述储能单元的另一端以及所述开关电源模块的输入端电性连接。The anode of the diode D8 is electrically connected to the other end of the first inductor, and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit and the input end of the switching power supply module, respectively.

所述开关电源模块包括开关电源单元、第二开关单元、第二电感以及阻容单元;所述反馈模块包括第二输出电压反馈单元以及第二输出电流反馈单元;The switching power supply module includes a switching power supply unit, a second switching unit, a second inductor and a resistance-capacitance unit; the feedback module includes a second output voltage feedback unit and a second output current feedback unit;

所述PFC校正升压模块输出端分别与阻容单元的一端以及外部负载的一极电性连接;The output end of the PFC correction boosting module is respectively electrically connected to one end of the resistance-capacitance unit and one pole of the external load;

所述第二电感的一端分别与阻容单元的另一端以及外部负载的另一极电性连接;One end of the second inductor is electrically connected to the other end of the resistance-capacitance unit and the other pole of the external load respectively;

所述第二开关单元的输入端与第二电感的另一端电性连接;The input end of the second switch unit is electrically connected to the other end of the second inductor;

所述第二开关单元的输出端通过所述第二输出电流反馈单元接地,所述第二输出电流反馈单元的输出端与所述开关电源单元的输出电流反馈端电性连接;The output terminal of the second switching unit is grounded through the second output current feedback unit, and the output terminal of the second output current feedback unit is electrically connected to the output current feedback terminal of the switching power supply unit;

所述第二输出电压反馈单元检测所述第二电感的两端电压,所述第二输出电压反馈单元的输出端与所述开关电源单元的电压反馈端电性连接;the second output voltage feedback unit detects the voltage across the second inductor, and the output end of the second output voltage feedback unit is electrically connected to the voltage feedback end of the switching power supply unit;

所述开关电源单元的控制输出端与所述第二开关单元电性连接。The control output end of the switching power supply unit is electrically connected to the second switching unit.

还包括过载短路保护模块,所述过载短路保护模块的一端分别与所述PFC校正升压模块输出端、所述阻容单元的所述一端以及外部负载的所述一极电性连接;It also includes an overload and short-circuit protection module, one end of the overload and short-circuit protection module is respectively electrically connected to the output end of the PFC correction boosting module, the one end of the resistance-capacitance unit and the one pole of the external load;

所述过载短路保护模块的另一端分别与所述第二电感的所述一端、所述阻容单元的所述另一端以及外部负载的所述另一极电性连接。The other end of the overload and short circuit protection module is respectively electrically connected to the one end of the second inductor, the other end of the resistance-capacitance unit and the other pole of the external load.

所述第二输出电压反馈单元包括与第二电感耦合的第三电感、电阻R24,所述第三电感的一端接地,所述第三电感的另一端分别与所述电阻R24的一端以及所述开关电源单元的电压反馈端电性连接,所述电阻R24的另一端接地。The second output voltage feedback unit includes a third inductor coupled with the second inductor, a resistor R24, one end of the third inductor is grounded, and the other end of the third inductor is connected to one end of the resistor R24 and the resistor R24 respectively. The voltage feedback end of the switching power supply unit is electrically connected, and the other end of the resistor R24 is grounded.

所述第二输出电流反馈单元包括电阻R31以及电阻R32,所述电阻R31的一端分别与所述电阻R32的一端以及所述第二开关单元的输出端电性连接,所述电阻R32的另一端接地,所述电阻R31的另一端与所述开关电源单元的输出电流反馈端电性连接。The second output current feedback unit includes a resistor R31 and a resistor R32, one end of the resistor R31 is electrically connected to one end of the resistor R32 and the output end of the second switch unit respectively, and the other end of the resistor R32 is electrically connected Grounding, the other end of the resistor R31 is electrically connected to the output current feedback end of the switching power supply unit.

上述公开的驱动电路中至少具有如下优点或有益效果之一:The driving circuit disclosed above has at least one of the following advantages or beneficial effects:

本实用新型驱动电路,PFC校正升压模块对外部电源进行升压,并且进行功率校正,提高电能利用效率,并且利用开关电源模块进行反馈降压驱动,得到高输入功率因素与低输入电流谐波的同时,输出电压的纹波较小,电压调整较快,对电路中的振动瞬时反应,输出一定范围的电压,能够根据接入负载的等级及时调整,与接入的负载能够合理匹配,工作稳定。In the driving circuit of the utility model, the PFC correction and boosting module boosts the external power supply, and performs power correction to improve the utilization efficiency of electric energy, and uses the switching power supply module to perform feedback and step-down driving, so as to obtain high input power factor and low input current harmonics At the same time, the ripple of the output voltage is small, the voltage adjustment is fast, it responds instantaneously to the vibration in the circuit, and outputs a certain range of voltage, which can be adjusted in time according to the level of the connected load, and can be reasonably matched with the connected load. Stablize.

本实用新型还公开了一种灯具,包括上述技术方案公开的一种输出稳定且高效的驱动电路以及LED负载,所述开关电源模块的输出端与LED负载连接以为LED负载供电。The utility model also discloses a lamp, comprising a driving circuit with stable and efficient output disclosed in the above technical solution and an LED load, wherein the output end of the switching power supply module is connected with the LED load to supply power to the LED load.

上述公开的灯具中至少具有如下优点或有益效果之一:The lamps disclosed above have at least one of the following advantages or beneficial effects:

本实用新型能够适配多种LED负载,并且保持输出稳定,减少电压纹波,具有较快的调整速度,具有较高的功率因素。The utility model can adapt to a variety of LED loads, keep the output stable, reduce the voltage ripple, has a faster adjustment speed, and has a higher power factor.

附图说明Description of drawings

下面结合附图对本实用新型的具体实施方式做进一步的说明。The specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.

图1是本实用新型驱动电路的原理结构示意图。FIG. 1 is a schematic diagram of the principle structure of the driving circuit of the present invention.

图2是本实用新型驱动电路的整流滤波模块的电路示意图。FIG. 2 is a schematic circuit diagram of a rectifier filter module of the drive circuit of the present invention.

图3是本实用新型驱动电路的PFS校正升压模块的电路示意图。FIG. 3 is a schematic circuit diagram of the PFS correction boosting module of the driving circuit of the present invention.

图4是本实用新型驱动电路的开关电源模块及反馈模块的电路示意图。4 is a schematic circuit diagram of a switching power supply module and a feedback module of the drive circuit of the present invention.

具体实施方式Detailed ways

本部分将详细描述本实用新型的具体实施例,本实用新型之较佳实施例在附图中示出,附图的作用在于用图形补充说明书文字部分的描述,使人能够直观地、形象地理解本实用新型的每个技术特征和整体技术方案,但其不能理解为对本实用新型保护范围的限制。This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Understand each technical feature and overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

在本实用新型的描述中,需要理解的是,涉及到方位描述,例如上、下、前、后、左、右等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本实用新型和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本实用新型的限制。In the description of the present utility model, it should be understood that the orientation descriptions related to orientations, such as up, down, front, rear, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

在本实用新型的描述中,若干的含义是一个或者多个,多个的含义是两个以上,大于、小于、超过等理解为不包括本数,以上、以下、以内等理解为包括本数。如果有描述到第一、第二只是用于区分技术特征为目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量或者隐含指明所指示的技术特征的先后关系。In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

本实用新型的描述中,除非另有明确的限定,设置、安装、连接等词语应做广义理解,所属技术领域技术人员可以结合技术方案的具体内容合理确定上述词语在本实用新型中的具体含义。In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution .

如图1-图4所示,一种输出稳定且高效的驱动电路,包括:As shown in Figure 1-Figure 4, a drive circuit with stable and efficient output includes:

PFC校正升压模块1,PFC校正升压模块1的输入端与外部电源电性连接;PFC correction boosting module 1, the input end of the PFC correction boosting module 1 is electrically connected with the external power supply;

开关电源模块2,开关电源模块2的输入端与PFC校正升压模块1的输出端电性连接,开关电源模块2的输出端能够与外部负载连接以为外部负载供电;The switching power supply module 2, the input terminal of the switching power supply module 2 is electrically connected with the output terminal of the PFC correction and boosting module 1, and the output terminal of the switching power supply module 2 can be connected with an external load to supply power to the external load;

反馈模块3,反馈模块3的输入端与开关电源模块2的输出端电性连接,反馈模块3的输出端与开关电源模块2的反馈端电性连接。The feedback module 3 , the input terminal of the feedback module 3 is electrically connected to the output terminal of the switching power supply module 2 , and the output terminal of the feedback module 3 is electrically connected to the feedback terminal of the switching power supply module 2 .

例如,本设计的某些实施例中,开关电源模块2能够输出226V电压,而对于220V-230V区间的各个用电负载接入,本设计能够及时调整,与各个等级的用电负载兼容。For example, in some embodiments of this design, the switching power supply module 2 can output a voltage of 226V, and the design can be adjusted in time for the connection of various electrical loads in the 220V-230V range, and is compatible with various levels of electrical loads.

PFC校正升压模块1对外部电源进行升压,并且进行功率校正,提高电能利用效率,并且利用开关电源模块2进行反馈降压驱动,得到高输入功率因素与低输入电流谐波的同时,输出电压的纹波较小,电压调整较快,对电路中的振动瞬时反应,输出一定范围的电压,能够根据接入负载的等级及时调整,与接入的负载能够合理匹配,工作稳定The PFC correction boosting module 1 boosts the external power supply and performs power correction to improve the power utilization efficiency, and uses the switching power supply module 2 to perform feedback buck drive to obtain high input power factor and low input current harmonics. The voltage ripple is small, the voltage adjustment is fast, it responds instantaneously to the vibration in the circuit, outputs a certain range of voltage, can be adjusted in time according to the level of the connected load, can reasonably match the connected load, and works stably

在某些实施例中,如图2所示,还包括整流滤波模块4,整流滤波模块4的输入端与外部交流电源电性连接,整流滤波模块4的输出端与PFC校正升压模块1的输出端电性连接。In some embodiments, as shown in FIG. 2 , a rectifier and filter module 4 is also included. The input end of the rectifier filter module 4 is electrically connected to the external AC power supply, and the output end of the rectifier filter module 4 is connected to the PFC correction and booster module 1 . The output terminal is electrically connected.

整流滤波模块4可以包括整流桥、保险丝F1、压敏电阻VR1、压敏电阻VR2、滤波电容CX1等部件,输出稳定的直流电。The rectifier filter module 4 may include components such as a rectifier bridge, a fuse F1, a varistor VR1, a varistor VR2, a filter capacitor CX1, and the like, to output stable direct current.

在某些实施例中,PFC校正升压模块1包括功率校正单元11、输入电压反馈单元12、第一输出电压反馈单元13、第一输出电流反馈单元14、第一电感T1以及第一开关单元15;In some embodiments, the PFC correction boosting module 1 includes a power correction unit 11 , an input voltage feedback unit 12 , a first output voltage feedback unit 13 , a first output current feedback unit 14 , a first inductor T1 and a first switch unit 15;

输入电压反馈单元12的输入端分别与整流滤波模块4的输出端以及第一电感T1的一端电性连接,输入电压反馈单元12的输出端与功率校正单元11的输入电压反馈端电性连接;The input end of the input voltage feedback unit 12 is electrically connected to the output end of the rectification filter module 4 and one end of the first inductor T1 respectively, and the output end of the input voltage feedback unit 12 is electrically connected to the input voltage feedback end of the power correction unit 11;

第一电感T1的另一端分别与第一输出电压反馈单元12的输入端、第一开关单元15的输入端以及开关电源模块2的输入端电性连接,第一输出电压反馈单元13的输出端与功率校正单元11的输出电压反馈端电性连接;The other end of the first inductor T1 is electrically connected to the input end of the first output voltage feedback unit 12 , the input end of the first switching unit 15 and the input end of the switching power supply module 2 respectively, and the output end of the first output voltage feedback unit 13 is electrically connected. is electrically connected to the output voltage feedback terminal of the power correction unit 11;

第一开关单元15的输出端通过第一输出电流反馈单元14接地;The output end of the first switching unit 15 is grounded through the first output current feedback unit 14;

第一输出电流反馈单元14的输出端与功率校正单元11的输出电流反馈端电性连接;The output terminal of the first output current feedback unit 14 is electrically connected to the output current feedback terminal of the power correction unit 11;

功率校正单元11的控制输出端与第一开关单元15的受控端电性连接。The control output end of the power calibration unit 11 is electrically connected to the controlled end of the first switch unit 15 .

其中,如图3所示,功率校正单元11可以在常规的功率校正芯片中选取,第一开关单元可以选用三极管或者MOS管,此处采用MOS管Q1。Among them, as shown in FIG. 3 , the power correction unit 11 can be selected from a conventional power correction chip, and the first switch unit can be selected from a triode or a MOS transistor, and a MOS transistor Q1 is used here.

输入电压反馈单元12可以由电阻R3、电阻R4、电阻R5、电阻R6构成的分压检测电路,电阻R3的一端接入整流滤波模块4的输出端,电阻R6的一端与功率校正单元11的输入电压反馈端电性连接。The input voltage feedback unit 12 can be a voltage divider detection circuit composed of a resistor R3, a resistor R4, a resistor R5, and a resistor R6. One end of the resistor R3 is connected to the output end of the rectification filter module 4, and one end of the resistor R6 is connected to the input of the power correction unit 11. The voltage feedback terminal is electrically connected.

第一输出电流反馈单元14包括电阻R13和电阻R14,电阻R13的一端分别与电阻R14的一端以及MOS管Q1的发射极电性连接,电阻R14的另一端接地,电阻R13的另一端与功率校正单元11的输出电流反馈端电性连接。The first output current feedback unit 14 includes a resistor R13 and a resistor R14, one end of the resistor R13 is electrically connected to one end of the resistor R14 and the emitter of the MOS transistor Q1, the other end of the resistor R14 is grounded, and the other end of the resistor R13 is connected to the power calibration The output current feedback terminal of the unit 11 is electrically connected.

第一输出电压反馈单元13可以由电阻R17、电阻R18、电阻R19、电阻R20构成的分压检测电路,电阻R17的一端接入整流滤波模块4的输出端,电阻R20的一端与功率校正单元11的输出电压反馈端电性连接。The first output voltage feedback unit 13 may be a voltage divider detection circuit composed of a resistor R17, a resistor R18, a resistor R19, and a resistor R20. One end of the resistor R17 is connected to the output end of the rectification filter module 4, and one end of the resistor R20 is connected to the power correction unit 11. The output voltage feedback terminal is electrically connected.

在某些实施例中,如图3所示,PFC校正升压模块1还包括储能单元16以及二极管D8;In some embodiments, as shown in FIG. 3 , the PFC correction boosting module 1 further includes an energy storage unit 16 and a diode D8;

储能单元16的一端分别与第一电感T1的一端以及整流滤波模块4的输出端电性连接;One end of the energy storage unit 16 is electrically connected to one end of the first inductor T1 and the output end of the rectification filter module 4 respectively;

二极管D8的正极与第一电感T1的另一端电性连接,二极管D8的负极分别与储能单元16的另一端以及开关电源模块2的输入端电性连接。The anode of the diode D8 is electrically connected to the other end of the first inductor T1 , and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit 16 and the input end of the switching power supply module 2 respectively.

其中,储能单元16可以在常规的电容元件中进行选取,储能单元16能够提高PFC校正升压模块1的升压能力,并且使得调整更加流畅灵活。The energy storage unit 16 can be selected from conventional capacitive elements, and the energy storage unit 16 can improve the boosting capability of the PFC correction boosting module 1 and make the adjustment more fluent and flexible.

在某些实施例中,如图4所示,开关电源模块2包括开关电源单元21、第二开关单元22、第二电感T2以及阻容单元23;反馈模块3包括第二输出电压反馈单元31以及第二输出电流反馈单元32;In some embodiments, as shown in FIG. 4 , the switching power supply module 2 includes a switching power supply unit 21 , a second switching unit 22 , a second inductor T2 and a resistance-capacitance unit 23 ; the feedback module 3 includes a second output voltage feedback unit 31 and a second output current feedback unit 32;

PFC校正升压模块1的输出端分别与阻容单元23的一端以及外部负载的一极电性连接;The output end of the PFC correction boosting module 1 is electrically connected to one end of the resistance-capacitance unit 23 and one pole of the external load respectively;

第二电感T2的一端分别与阻容单元23的另一端以及外部负载的另一极电性连接;One end of the second inductor T2 is electrically connected to the other end of the resistance-capacitance unit 23 and the other pole of the external load, respectively;

第二开关单元22的输入端与第二电感T2的另一端电性连接;The input end of the second switch unit 22 is electrically connected to the other end of the second inductor T2;

第二开关单元22的输出端通过第二输出电流反馈单元32接地,第二输出电流反馈单元32的输出端与开关电源单元21的输出电流反馈端电性连接;The output terminal of the second switching unit 22 is grounded through the second output current feedback unit 32, and the output terminal of the second output current feedback unit 32 is electrically connected to the output current feedback terminal of the switching power supply unit 21;

第二输出电压反馈单元31检测第二电感T2的两端电压,第二输出电压反馈单元31的输出端与开关电源单元21的电压反馈端电性连接;The second output voltage feedback unit 31 detects the voltage across the second inductor T2, and the output terminal of the second output voltage feedback unit 31 is electrically connected to the voltage feedback terminal of the switching power supply unit 21;

开关电源单元21的控制输出端与第二开关单元22电性连接。The control output end of the switching power supply unit 21 is electrically connected to the second switching unit 22 .

其中,开关电源单元21可以在常规的开关电源芯片中选取,第二开关单元22可以采用常规型号的三极管或者MOS管,本设计的其一实施例中采用MOS管Q2,阻容单元可以由电阻R37、电阻R39以及电容E4构成;Among them, the switching power supply unit 21 can be selected from a conventional switching power supply chip, the second switching unit 22 can be a conventional type triode or a MOS transistor, in one embodiment of this design, a MOS transistor Q2 is used, and the resistance-capacitance unit can be composed of resistors. R37, resistor R39 and capacitor E4 constitute;

在某些实施例中,第二输出电压反馈单元31包括与第二电感T2耦合的第三电感T3、电阻R24,第三电感T3的一端接地,第三电感T3的另一端分别与电阻R24的一端以及开关电源单元21的电压反馈端电性连接,电阻R24的另一端接地。In some embodiments, the second output voltage feedback unit 31 includes a third inductor T3 coupled with the second inductor T2, and a resistor R24. One end of the third inductor T3 is grounded, and the other end of the third inductor T3 is connected to the resistor R24. One end and the voltage feedback end of the switching power supply unit 21 are electrically connected, and the other end of the resistor R24 is grounded.

第三电感T3感应第二电感T2两端的电压,从而反映出输出电压的大小,便于开关电源单元21对第二开关单元22实行驱动控制。The third inductance T3 senses the voltage across the second inductance T2 to reflect the magnitude of the output voltage, so that the switching power supply unit 21 can control the driving of the second switching unit 22 .

在某些实施例中,第二输出电流反馈单元32包括电阻R31以及电阻R32,电阻R31的一端分别与电阻R32的一端以及第二开关单元22的输出端电性连接,电阻R32的另一端接地,电阻R31的另一端与开关电源单元21的输出电流反馈端电性连接。In some embodiments, the second output current feedback unit 32 includes a resistor R31 and a resistor R32, one end of the resistor R31 is electrically connected to one end of the resistor R32 and the output end of the second switch unit 22 respectively, and the other end of the resistor R32 is grounded , the other end of the resistor R31 is electrically connected to the output current feedback end of the switching power supply unit 21 .

开关电源单元21根据反馈的输出电压和输出电流,控制第二开关单元22运行,从而调整输出给负载两端的电压电流。The switching power supply unit 21 controls the operation of the second switching unit 22 according to the feedback output voltage and output current, so as to adjust the voltage and current output to both ends of the load.

在某些实施例中,还包括过载短路保护模块5,过载短路保护模块5的一端分别与PFC校正升压模块1的输出端、阻容单元23的一端以及外部负载的一极电性连接;In some embodiments, an overload short circuit protection module 5 is also included, and one end of the overload short circuit protection module 5 is respectively electrically connected to the output end of the PFC correction boosting module 1, one end of the resistance-capacitance unit 23 and one pole of the external load;

过载短路保护模块5的另一端分别与第二电感T2的一端、阻容单元23的另一端以及外部负载的另一极电性连接。The other end of the overload short circuit protection module 5 is electrically connected to one end of the second inductor T2, the other end of the resistance-capacitance unit 23 and the other pole of the external load, respectively.

过载短路保护模块5可以由压敏元件TV1构成,当输出电压过高或者输出电流过大而引起输出电压瞬时升高,能够使得压敏元件导通,从而保护负载不受损坏。The overload short-circuit protection module 5 can be composed of a pressure-sensitive element TV1. When the output voltage is too high or the output current is too large, the output voltage increases instantaneously, and the pressure-sensitive element can be turned on, thereby protecting the load from damage.

本实用新型具体实施例还公开了一种灯具,包括上述任一实施例公开的一种输出稳定且高效的驱动电路以及LED负载,开关电源模块的输出端与LED负载连接以为LED负载供电。A specific embodiment of the present invention also discloses a lamp, comprising a drive circuit with stable and efficient output disclosed in any of the above embodiments, and an LED load. The output end of the switching power supply module is connected to the LED load to supply power to the LED load.

本实用新型能够适配多种LED负载,并且保持输出稳定,减少电压纹波,具有较快的调整速度,具有较高的功率因素。The utility model can adapt to a variety of LED loads, keep the output stable, reduce the voltage ripple, has a faster adjustment speed, and has a higher power factor.

本领域的技术人员容易理解的是,在不冲突的前提下,上述优选方式可以自由地组合和叠加。Those skilled in the art can easily understand that, under the premise of no conflict, the above preferred modes can be freely combined and superimposed.

上面结合附图对本实用新型实施例作了详细说明,但是本实用新型不限于上述实施例,在所述技术领域普通技术人员所具备的知识范围内,还可以在不脱离本实用新型宗旨的前提下作出各种变化。The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, the present utility model can also be used without departing from the purpose of the present utility model. make various changes.

Claims (9)

1. A stable and efficient output driver circuit, comprising:
the input end of the PFC correction boosting module is electrically connected with an external power supply;
the input end of the switching power supply module is electrically connected with the output end of the PFC correction boosting module, and the output end of the switching power supply module can be connected with an external load to supply power to the external load;
and the input end of the feedback module is electrically connected with the output end of the switching power supply module, and the output end of the feedback module is electrically connected with the feedback end of the switching power supply module.
2. The driving circuit according to claim 1, wherein: the input end of the rectification filter module is electrically connected with an external alternating current power supply, and the output end of the rectification filter module is electrically connected with the output end of the PFC correction boosting module.
3. A stable and efficient output driver circuit as claimed in claim 2, wherein: the PFC correction boosting module comprises a power correction unit, an input voltage feedback unit, a first output current feedback unit, a first inductor and a first switch unit;
the input end of the input voltage feedback unit is electrically connected with the output end of the rectification filter module and one end of the first inductor respectively, and the output end of the input voltage feedback unit is electrically connected with the input voltage feedback end of the power correction unit;
the other end of the first inductor is electrically connected with the input end of the first output voltage feedback unit, the input end of the first switch unit and the input end of the switch power supply module respectively, and the output end of the first output voltage feedback unit is electrically connected with the output voltage feedback end of the power correction unit;
the output end of the first switch unit is grounded through the first output current feedback unit; the output end of the first output current feedback unit is electrically connected with the output current feedback end of the power correction unit;
and the control output end of the power correction unit is electrically connected with the controlled end of the first switch unit.
4. A stable and efficient output driver circuit as claimed in claim 3, wherein: the PFC correction boost module further comprises an energy storage unit and a diode D8;
one end of the energy storage unit is electrically connected with the one end of the first inductor and the output end of the rectification filter module respectively;
the anode of the diode D8 is electrically connected to the other end of the first inductor, and the cathode of the diode D8 is electrically connected to the other end of the energy storage unit and the input terminal of the switching power supply module, respectively.
5. The driving circuit according to claim 1, wherein: the switching power supply module comprises a switching power supply unit, a second switching unit, a second inductor and a resistance-capacitance unit; the feedback module comprises a second output voltage feedback unit and a second output current feedback unit;
the output end of the PFC correction boosting module is electrically connected with one end of the resistance-capacitance unit and one pole of an external load respectively;
one end of the second inductor is electrically connected with the other end of the resistance-capacitance unit and the other end of the external load respectively;
the input end of the second switch unit is electrically connected with the other end of the second inductor;
the output end of the second switch unit is grounded through the second output current feedback unit, and the output end of the second output current feedback unit is electrically connected with the output current feedback end of the switch power supply unit;
the second output voltage feedback unit detects the voltages at two ends of the second inductor, and the output end of the second output voltage feedback unit is electrically connected with the voltage feedback end of the switching power supply unit;
and the control output end of the switching power supply unit is electrically connected with the second switching unit.
6. The driving circuit of claim 5, wherein: the power supply further comprises an overload short-circuit protection module, wherein one end of the overload short-circuit protection module is electrically connected with the output end of the PFC correction boosting module, the one end of the resistance-capacitance unit and the one pole of the external load respectively;
the other end of the overload short-circuit protection module is electrically connected with the one end of the second inductor, the other end of the resistance-capacitance unit and the other end of the external load respectively.
7. The driving circuit of claim 5, wherein: the second output voltage feedback unit comprises a third inductor and a resistor R24, wherein the third inductor is coupled with the second inductor, one end of the third inductor is grounded, the other end of the third inductor is respectively electrically connected with one end of the resistor R24 and the voltage feedback end of the switching power supply unit, and the other end of the resistor R24 is grounded.
8. The driving circuit of claim 5, wherein: the second output current feedback unit comprises a resistor R31 and a resistor R32, one end of the resistor R31 is respectively connected with one end of the resistor R32 and the output end of the second switch unit, the other end of the resistor R32 is grounded, and the other end of the resistor R31 is electrically connected with the output current feedback end of the switch power supply unit.
9. A lamp comprising a stable and efficient output driving circuit as claimed in any one of claims 1 to 8 and an LED load, wherein the output terminal of the switching power supply module is connected to the LED load to supply power to the LED load.
CN201921738893.4U 2019-10-16 2019-10-16 A drive circuit with stable and efficient output and a lamp using the same Active CN211352514U (en)

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