WO2015196672A1 - 功率因数校正电路自带辅助电源电路及其控制方法和装置 - Google Patents

功率因数校正电路自带辅助电源电路及其控制方法和装置 Download PDF

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Publication number
WO2015196672A1
WO2015196672A1 PCT/CN2014/089410 CN2014089410W WO2015196672A1 WO 2015196672 A1 WO2015196672 A1 WO 2015196672A1 CN 2014089410 W CN2014089410 W CN 2014089410W WO 2015196672 A1 WO2015196672 A1 WO 2015196672A1
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circuit
pfc
alternating current
pulse signal
diode
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PCT/CN2014/089410
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English (en)
French (fr)
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余世伟
陈亮
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欧普照明股份有限公司
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Publication of WO2015196672A1 publication Critical patent/WO2015196672A1/zh

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    • 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
    • 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 present invention relates to the field of PFC (power factor correction) technology, and more particularly to a PFC circuit with an auxiliary power supply circuit, a control method thereof and a control device.
  • PFC power factor correction
  • Figure 1 shows a conventional PFC circuit with an auxiliary power supply circuit.
  • the PFC circuit has its own auxiliary power supply circuit including: rectifier bridges DB1-DB4, receiving AC input voltage, and rectifying the AC input voltage into DC input voltage; input capacitor CBB2, connected in parallel between rectifier bridges DB1-DB4 The filter output signal of the rectifier bridge is filtered; the PFC switching power supply including the inductor L2, the switch transistor Q1 and the diode D1 is connected in parallel with the input capacitor CBB2 for generating the DC output required for the load.
  • ⁇ 2 is a conventional PFC circuit including a PFC control circuit with an auxiliary power supply circuit.
  • the PFC control circuit controls the operation of the PFC switching power supply by outputting a drive signal.
  • the two PFC inductive windings shown in Figures 1 and 2 can be used to power the control line as an auxiliary power source. They have a characteristic that they can hardly supply energy when the PFC is very light or empty, so that the entire power supply Very light load or standby mode does not provide a stable auxiliary power supply.
  • Figures 3 and 4 show the current flow on the inductor L2 in the existing PFC circuit with the auxiliary power supply circuit when the PFC is lightly loaded.
  • the PFC control circuit within a power frequency cycle may only issue a small number of drive pulses (ie, the drive pulse is intermittent, for example, only 10ms within a power frequency cycle of 50ms, the PFC control circuit is transmitting
  • the driving pulse which is often the lighter the load, the shorter the working time ratio, drives the switching tube Q1.
  • the main winding and the auxiliary winding of the inductor L2 are coupled and have current flow Both the primary winding and the auxiliary winding induce a corresponding proportional voltage.
  • the pulse is issued when the instantaneous value of the AC input voltage is low, the voltage difference between the two sides of the inductor L2 is relatively large when the pulse is turned off, that is, the voltage drop is high, because the voltage at the end of the main winding 2 of the inductor L2 is also the input.
  • the voltage is low, and the voltage at the 3 terminal is the output voltage is basically constant, so the voltage drop is relatively large, the voltage drop of the main winding of the inductor L2 is large, the auxiliary winding of the inductor L2 also induces a relatively large voltage, and the current flow on the auxiliary winding of the inductor L2 As shown in Figure 4.
  • the present application is a novel PFC circuit-based auxiliary power supply circuit, which adopts a PFC control circuit that is turned on when the AC input voltage is low at a light load, that is, the PFC control circuit works normally when the absolute value of the instantaneous value of the AC voltage is low, so that The PFC control circuit operates near the AC voltage across zero, enabling stable output at light loads.
  • the present application discloses a PFC circuit with an auxiliary power supply circuit, comprising: a PFC circuit, receiving an AC input voltage from an AC power source, and generating a DC output voltage required for the load and an auxiliary power voltage output; a PFC load size judging circuit, receiving The output current from the PFC circuit, and judge whether the load of the PFC circuit is high or low according to the output current.
  • the shield signal is output to the alternating current instantaneous voltage detecting circuit; the alternating current instantaneous voltage detecting circuit receives the AC power source.
  • the AC input voltage detects the instantaneous value of the AC input voltage, generates a pulse signal synchronized with the AC input voltage, and outputs the pulse signal to the PFC control circuit.
  • the PFC control circuit controls the PFC circuit according to the normal working mode when the enable terminal receives the high-level pulse signal, and is in the non-working state when the enable terminal receives the low-level pulse signal.
  • the present application also discloses a control device for a PFC circuit with an auxiliary power supply circuit, the PFC circuit operating according to the control of the PFC control circuit, the control device comprising: a PFC load size determination circuit, receiving an output current from the PFC circuit, and Judging whether the load of the PFC circuit is high or low according to the output current, when determining that the load of the PFC circuit is high, outputting a shielding signal to the alternating current instantaneous voltage detecting circuit; the alternating current instantaneous voltage detecting circuit receiving the alternating current input voltage from the alternating current power source, and the alternating current input The instantaneous value of the voltage is detected, a pulse signal synchronized with the AC input voltage is generated, and the pulse signal is output to the enable end of the PFC control circuit.
  • the present application also discloses a PFC circuit self-contained auxiliary power supply circuit control method, the PFC circuit operates according to the control of the PFC control circuit, the control method includes: detecting whether the load of the PFC circuit is high or low; when detecting the PFC circuit When the load is low, the AC input voltage is detected; a pulse signal synchronized with the AC input voltage is generated and output to the PFC control circuit; and the pulse signal controls the PFC control circuit to be in an active state or a non-operation state.
  • Figure 1 shows a conventional PFC circuit with an auxiliary power supply circuit.
  • ⁇ 2 is a conventional PFC circuit including a PFC control circuit with an auxiliary power supply circuit.
  • Figures 3 and 4 show the current flow on the inductor L2 in the existing PFC circuit with the auxiliary power supply circuit when the PFC is lightly loaded.
  • FIG. 5 shows a block diagram of a PFC circuit with an auxiliary power supply circuit in accordance with an embodiment of the present invention.
  • FIG. 6 shows a detailed circuit diagram of an alternating current instantaneous voltage detecting circuit according to an embodiment of the present invention.
  • FIG. 7A and 7B are diagrams showing the manner in which a PFC control circuit is controlled by a pulse signal output from an alternating current instantaneous voltage detecting circuit in accordance with an embodiment of the present invention.
  • FIG. 8 is a flow chart showing a control method of a PFC circuit with an auxiliary power supply circuit according to an embodiment of the present invention.
  • first, second, third, etc. may be used herein to describe various elements, components and/or portions, these elements, components and/or portions are not limited by these terms. These terms are only used to distinguish one element, component or part. Thus, a first element, component or portion discussed below may be referred to as a second element, component or portion without departing from the teachings of the invention.
  • the main technical feature of the present invention is that, when the PFC circuit is under no-load or very light load, the intermittent driving pulses from the PFC control circuit are all sent out when the input AC power is low, and the PFC is controlled.
  • the control circuit does not work when the input AC power is high, so that a large voltage difference between the two ends of the inductor can be ensured, thereby ensuring the auxiliary winding voltage output of the inductor as the auxiliary power source.
  • FIG. 5 shows a block diagram of a PFC circuit with an auxiliary power supply circuit in accordance with an embodiment of the present invention.
  • the PFC circuit has its own auxiliary power supply circuit including a PFC circuit 501, a PFC control circuit 503, and a control device.
  • the control device includes an alternating current instantaneous voltage detecting circuit 502 and a PFC load size determining circuit 504.
  • the PFC circuit 501 receives an AC input voltage from an AC power source and generates a DC output required for the load and an auxiliary power voltage output.
  • the PFC load size judging circuit 504 receives the DC output from the PFC circuit 501, and judges whether the load of the PFC circuit 501 is high or low based on the DC output. When the PFC load size judging circuit 504 judges that the PFC circuit 501 is high (full load), the AC instantaneous voltage detecting circuit 502 is shielded. At this time, the PFC circuit 501 and the conventional PFC external auxiliary power supply work in exactly the same state.
  • the PFC load size judging circuit 504 is for shielding the AC instantaneous voltage detecting circuit 502 when the PFC circuit 501 is heavily loaded, and does not output the mask signal to the AC instantaneous voltage detecting circuit 502 when the PFC circuit 501 is under a low load.
  • the PFC load size determination circuit 504 is shown in FIG. 5 to determine the level of the load of the PFC circuit 501 based on the DC output from the PFC circuit 501, those skilled in the art will appreciate that the PFC load size determination circuit 504 can also be based on other signals.
  • the level of the load of the PFC circuit 501 is judged.
  • a DC-DC converter is usually connected to the PFC circuit, and the PFC load size determining circuit 504 can also receive an enable signal or output power of the DC-DC converter, and determine the load of the PFC circuit 501 based thereon. High and low.
  • the AC instantaneous voltage detecting circuit 502 does not operate when receiving the mask signal from the PFC load size determining circuit 504 (the mask signal is, for example, a long high level).
  • the mask signal from the PFC load size judging circuit 504 is not received, that is, when the PFC circuit 501 is lightly loaded or idling, the AC instantaneous voltage detecting circuit 502 operates.
  • the AC instantaneous voltage detecting circuit 502 receives the AC input voltage from the AC power source, detects the instantaneous value of the AC input voltage, and obtains a pulse signal synchronized with the AC input voltage (for example, the instantaneous absolute value of the AC input voltage is lower than a predetermined threshold)
  • the pulse signal is at a high level, and when the instantaneous absolute value of the AC input voltage is higher than a predetermined threshold, the pulse signal is at a low level, and the pulse signal is output to the enable end of the PFC control circuit 503.
  • the enable terminal of the PFC control circuit 503 receives the pulse signal.
  • the PFC control circuit 503 is enabled to control the operation of the PFC circuit 502 in accordance with the normal operation mode, that is, the switching transistor Q1 is turned on or off according to the driving voltage from the PFC control circuit 503, and allows the input current.
  • the waveform tracks the voltage waveform while the auxiliary winding of the inductor L2 of the PFC circuit 502 induces a voltage as an auxiliary power supply output voltage.
  • the PFC control circuit 503 is disabled.
  • the AC instantaneous voltage detecting circuit 502 emit a high level signal only when the AC input signal is low to force the PFC control circuit 503 to be in operation, thereby ensuring that the PFC inductor auxiliary winding output voltage is high.
  • the PFC circuit 501 and the PFC control circuit 503 can employ the existing PFC circuit and its control circuit as described in FIGS. 1 and 2, and other suitable PFC circuits and their control circuits can also be used.
  • FIG. 6 shows a detailed circuit diagram of an alternating current transient voltage detecting circuit 502 in accordance with an embodiment of the present invention.
  • the alternating current instantaneous voltage detecting circuit 502 includes first and second diodes D8 and D9, a Zener diode ZD3, and a transistor Q4. Positive electrode of the first diode D8 and second diode The positive terminal of D9 serves as an input terminal of the alternating current instantaneous voltage detecting circuit 502, and receives an input from an alternating current power source.
  • the anode of the first diode D8 is coupled to the L terminal of the AC power source
  • the anode of the second diode D9 is coupled to the N terminal of the neutral line of the AC power source
  • the negative pole is coupled to the negative pole of the Zener diode ZD3, the anode of the Zener diode ZD3 is coupled to the base of the transistor Q4, the collector of the transistor Q4 is the output of the AC instantaneous voltage detecting circuit 502, and the emitter of the transistor Q4 is grounded.
  • the alternating current transient voltage detecting circuit 502 further includes first to fourth resistors R37, R38, R39, and R14.
  • the first to third resistors R37-R39 are connected between the connection point of the negative electrode of the first diode D8 and the negative electrode of the second diode D9 and the negative electrode of the Zener diode ZD3, and the collector of the transistor Q4 passes the fourth The resistor R14 is connected to the power supply Vcc.
  • the alternating current instantaneous voltage detecting circuit 502 detects an alternating current input voltage from the alternating current power source received at the input end thereof, and when the instantaneous absolute value of the input voltage is detected to be lower than a predetermined threshold, the alternating current instantaneous voltage detecting circuit 502 outputs a high level through the output end thereof.
  • the pulse signal is sent to the PFC control circuit 503 to enable the PFC control circuit 503 to operate normally.
  • the alternating current instantaneous voltage detecting circuit 502 When it is detected that the instantaneous absolute value of the input voltage is higher than a predetermined threshold, the alternating current instantaneous voltage detecting circuit 502 outputs a low level pulse signal through its output terminal, and the PFC control circuit 503 is prohibited from operating.
  • the alternating current instantaneous voltage detecting circuit 502 is not limited to the circuit shown in FIG. 6, and FIG. 6 is only one of the implementations of the alternating current instantaneous voltage detecting circuit 502. Any circuit capable of realizing the function of the alternating current instantaneous voltage detecting circuit 502 of the present invention is within the scope of the present invention.
  • FIGS. 7A and 7B are diagrams for controlling the PFC control circuit 503 by a pulse signal output from the alternating current instantaneous voltage detecting circuit 502 according to an embodiment of the present invention.
  • the PFC control circuit 503 shown in Figures 7A and 7B is an existing L6562 PFC controller.
  • the pulse signal output from the alternating current instantaneous voltage detecting circuit 502 can be directly output to the zero current detector in the PFC control circuit 503 to enable the L6562 PFC controller. Current zero crossing detection section.
  • the pulse signal output from the alternating current instantaneous voltage detecting circuit 502 can be directly output to the driver in the PFC control circuit 503 to directly enable the PFC pulse output portion. Applying the enable signal in both ways can force the PFC control circuit 503 to not operate when the AC input voltage is high, and to operate normally when the instantaneous absolute value of the AC input voltage is below a predetermined threshold.
  • the PFC control circuit 503 when the AC input voltage is high, the PFC control circuit 503 does not supply the driving voltage to the switching transistor Q1 inside the PFC circuit 501; and when the instantaneous absolute value of the AC input voltage is lower than the predetermined threshold, the PFC control circuit 503 goes to the PFC circuit.
  • the switching transistor Q1 inside the 501 provides a driving voltage.
  • the PFC control circuit 503 is not limited to the L6562 PFC controller shown in FIG. 7, and therefore, the manner of adding an enable signal to the PFC control circuit 503 is not limited to the mode shown in FIG. Any of the circuits capable of implementing the functions of the PFC control circuit 503 of the present invention and the various ways of applying an enable signal to the PFC control circuit 503 are within the scope of the present invention.
  • FIG. 8 is a flow chart showing a control method of a PFC circuit with an auxiliary power supply circuit according to an embodiment of the present invention.
  • step 801 it is detected whether the load of the PFC circuit is high or low.
  • the AC input voltage is detected when the load of the PFC circuit is low.
  • a pulse signal synchronized with the AC input voltage is generated and output to the PFC control circuit, wherein when the instantaneous absolute value of the AC input voltage is below a predetermined threshold, the pulse signal is at a high level; when the AC input voltage is The pulse signal is at a low level when the instantaneous absolute value is above a predetermined threshold.
  • the pulse signal controls the PFC control circuit to be in an active or inactive state, ie, when the PFC control circuit receives a high level pulse signal, it operates normally, and does not operate when a low level pulse signal is received.
  • the improved control device of the PFC circuit with the auxiliary power supply circuit has an AC input voltage instantaneous value detecting circuit, and the output signal of the AC voltage instantaneous value detecting circuit is Output to the PFC control circuit, and under light load, when the AC input voltage is low, the AC voltage instantaneous value detecting circuit outputs a high level pulse, and under heavy load, shields the AC voltage instantaneous value detecting circuit from the function .
  • the improved control method according to an embodiment of the present invention is suitable for using an auxiliary winding of a PFC circuit as an auxiliary power source, and requires that the auxiliary power source of the PFC circuit is also lightly loaded or under no load (the control circuit operates in a standby state).
  • the drive circuit of the luminaire has a control receiver module that receives the remote control signal when the luminaire is off (the main output is off).

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Abstract

一种PFC电路自带辅助电源电路包括：PFC电路（501），接收来自交流电源的交流输入电压，并产生负载所需的直流输出电压以及辅助电源电压输出；PFC负载大小判断电路（504），接收来自PFC电路的输出电流，并根据该输出电流判断PFC电路的负载是高还是低，当判断PFC电路负载高时，向交流电瞬时电压检测电路输出屏蔽信号；交流电瞬时电压检测电路（502），接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，生成与交流输入电压同步的脉冲信号，并将该脉冲信号输出到PFC控制电路（503）的使能端；PFC控制电路，当其使能端接收到高电平的脉冲信号时，按照正常工作方式控制PFC电路工作，当其使能端接收到低电平的脉冲信号时，处于非工作状态。

Description

功率因数校正电路自带辅助电源电路及其控制方法和装置 技术领域
本发明涉及PFC(power factor correction,功率因数校正)技术领域，更具体地说，涉及一种PFC电路自带辅助电源电路及其控制方法和控制装置。
背景技术
图1是现有的PFC电路自带辅助电源电路。
如图1所述，PFC电路自带辅助电源电路包括：整流桥DB1-DB4，接收交流输入电压，并将交流输入电压整流为直流输入电压；输入电容器CBB2，并联于整流桥DB1-DB4之间，对整流桥输出信号进行滤波；包括电感L2、开关管Q1和二极管D1的PFC开关电源，与输入电容器CBB2并联，用于产生负载所需的直流输出。
图2是现有的包含PFC控制电路的PFC电路自带辅助电源电路。
PFC控制电路通过输出驱动信号来控制PFC开关电源工作。
图1和图2中所示的两种PFC电感辅助绕组可以用来作为辅助电源给控制线路供电，它们有一个特点就是在PFC很轻负载或者空载时几乎不能提供能量，这样的话在整个电源很轻负载或者待机状态下，不能提供稳定的辅助电源。
图3和图4示出了在PFC轻载时现有的PFC电路自带辅助电源电路中电感L2上的电流流向。
在PFC轻载的情况下，一个工频周期之内PFC控制电路可能只发出一串很少数量的驱动脉冲(也即驱动脉冲断续，比如一个工频周期50ms内只有10msPFC控制电路是在发驱动脉冲的，往往是负载越轻，工作的时间比例越短)来驱动开关管Q1。电感L2的主绕组和辅助绕组是耦合的，有电流流动 时，主绕组和辅助绕组都感应出对应比例的电压。
如图3所示，如果脉冲是在交流输入电压瞬时值为高的时候发出，则脉冲关断后，电感L2主绕组两侧电压差比较小，即电压降小，电感L2上的电流会沿着PFC主电路的方向输出。
如图4所示，如果脉冲是在交流输入电压瞬时值低的时候发出，则脉冲关断时电感L2两侧电压差比较大，即压降高，因为电感L2主绕组2端的电压也就是输入电压为低，而3端的电压也就是输出电压基本恒定，所以压降比较大，电感L2主绕组压降大，电感L2辅助绕组也会感应出比较大的电压，电感L2辅助绕组上的电流流向如图4所示。
本发明正是基于图3和图4中的现象得到的。
发明内容
本发明的另外方面和优点部分将在后面的描述中阐述，还有部分可从描述中明显地看出，或者可以在本发明的实践中得到。
本申请为一种新型的基于PFC电路的辅助电源电路，采用在轻载时PFC控制电路在交流输入电压低时导通，即，交流电压的瞬时值绝对值低时PFC控制电路正常工作，使得PFC控制电路在交流电压过0附近工作，从而实现轻载时能稳定输出。
本申请公开了一种PFC电路自带辅助电源电路，包括：PFC电路，接收来自交流电源的交流输入电压，并产生负载所需的直流输出电压以及辅助电源电压输出；PFC负载大小判断电路，接收来自PFC电路的输出电流，并根据该输出电流判断PFC电路的负载是高还是低，当判断PFC电路负载高时，向交流电瞬时电压检测电路输出屏蔽信号；交流电瞬时电压检测电路，接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，生成与交流输入电压同步的脉冲信号，并将该脉冲信号输出到PFC控制电路的使能 端；PFC控制电路，当其使能端接收到高电平的脉冲信号时，按照正常工作方式控制PFC电路工作，当其使能端接收到低电平的脉冲信号时，处于非工作状态。
本申请还公开了一种PFC电路自带辅助电源电路的控制装置，该PFC电路根据PFC控制电路的控制进行工作，该控制装置包括：PFC负载大小判断电路，接收来自PFC电路的输出电流，并根据该输出电流判断PFC电路的负载是高还是低，当判断PFC电路负载高时，向交流电瞬时电压检测电路输出屏蔽信号；交流电瞬时电压检测电路，接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，生成与交流输入电压同步的脉冲信号，并将该脉冲信号输出到PFC控制电路的使能端。
本申请还公开了一种PFC电路自带辅助电源电路的控制方法，该PFC电路根据PFC控制电路的控制进行工作，该控制方法包括：检测PFC电路的负载是高还是低；当检测到PFC电路的负载是低时，检测交流输入电压；生成与交流输入电压同步的脉冲信号，并输出到PFC控制电路；所述脉冲信号控制PFC控制电路处于工作状态或者非工作状态。
附图说明
通过结合附图对本发明的优选实施例进行详细描述，本发明的上述和其他目的、特性和优点将会变得更加清楚，其中相同的标号指定相同结构的单元，并且在其中：
图1是现有的PFC电路自带辅助电源电路。
图2是现有的包含PFC控制电路的PFC电路自带辅助电源电路。
图3和图4示出了在PFC轻载时现有的PFC电路自带辅助电源电路中电感L2上的电流流向。
图5示出了根据本发明实施例的PFC电路自带辅助电源电路的框图。
图6示出了根据本发明实施例的交流电瞬时电压检测电路的具体电路示意图。
图7A和7B是根据本发明实施例通过交流电瞬时电压检测电路输出的脉冲信号对PFC控制电路进行控制的方式。
图8示出了根据本发明实施例的PFC电路自带辅助电源电路的控制方法流程图。
具体实施方式
下面将参照示出本发明实施例的附图充分描述本发明。然而，本发明可以以许多不同的形式实现，而不应当认为限于这里所述的实施例。相反，提供这些实施例以便使本公开透彻且完整，并且将向本领域技术人员充分表达本发明的范围。在附图中，为了清楚起见放大了组件。
应当理解，当称“元件”“连接到”或“耦接”到另一元件时，它可以是直接连接或耦接到另一元件或者可以存在中间元件。相反，当称元件“直接连接到”或“直接耦接到”另一元件时，不存在中间元件。相同的附图标记指示相同的元件。这里使用的术语“和/或”包括一个或多个相关列出的项目的任何和所有组合。
应当理解，尽管这里可以使用术语第一、第二、第三等描述各个元件、组件和/或部分，但这些元件、组件和/或部分不受这些术语限制。这些术语仅仅用于将元件、组件或部分相互区分开来。因此，下面讨论的第一元件、组件或部分在不背离本发明教学的前提下可以称为第二元件、组件或部分。
除非另有定义，这里使用的所有术语(包括技术和科学术语)具有与本发明所属领域的普通技术人员共同理解的相同含义。还应当理解，诸如在通常字典里定义的那些术语应当被解释为具有与它们在相关技术的上下文中的含义相一致的含义，而不应用理想化或极度形式化的意义来解释，除非这 里明确地这样定义。
本发明的主要技术特征是，通过外加的控制电路，使得PFC电路在空载或者极轻负载时，PFC控制电路发出的断续的驱动脉冲全部是在输入交流电为低电位时刻发出，而控制PFC控制电路在输入交流电为高电位时不工作，这样就能够保证电感两端有较大的电压差，从而保证作为辅助电源的电感的辅助绕组电压输出。
图5示出了根据本发明实施例的PFC电路自带辅助电源电路的框图。
如图5所示，PFC电路自带辅助电源电路包括：PFC电路501、PFC控制电路503、以及控制装置。该控制装置包含交流电瞬时电压检测电路502和PFC负载大小判断电路504。
PFC电路501接收来自交流电源的交流输入电压，并产生负载所需的直流输出以及辅助电源电压输出。
PFC负载大小判断电路504接收来自PFC电路501的直流输出，并根据该直流输出判断PFC电路501的负载是高还是低。当PFC负载大小判断电路504判断PFC电路501负载高(满载)时，屏蔽交流电瞬时电压检测电路502。此时，PFC电路501和传统PFC外挂辅助电源工作状态完全相同。PFC负载大小判断电路504用于在PFC电路501高负载时屏蔽交流电瞬时电压检测电路502，而在PFC电路501低负载时不对交流电瞬时电压检测电路502输出屏蔽信号。
虽然图5中示出PFC负载大小判断电路504根据来自PFC电路501的直流输出来判断PFC电路501的负载的高低，但本领域技术人员应该理解，PFC负载大小判断电路504还可以根据其他信号来判断PFC电路501的负载的高低。例如，通常在PFC电路后面还接有DC-DC转换器，PFC负载大小判断电路504也可以接收该DC-DC转换器的使能信号或者输出功率，并据此来判断PFC电路501的负载的高低。
交流电瞬时电压检测电路502在接收到来自PFC负载大小判断电路504的屏蔽信号时，不工作(所述屏蔽信号例如是长高电平)。而未接收到来自PFC负载大小判断电路504的屏蔽信号时，也即在PFC电路501轻载或者空载时，交流电瞬时电压检测电路502工作。
交流电瞬时电压检测电路502接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，并得出一个与交流输入电压同步的脉冲信号(比如交流输入电压的瞬时绝对值低于预定阈值时该脉冲信号为高电平，而在交流输入电压的瞬时绝对值高于预定阈值时，该脉冲信号为低电平)，再将该脉冲信号输出到PFC控制电路503的使能端。
PFC控制电路503的使能端接收脉冲信号。当脉冲信号是高电平时，PFC控制电路503被使能，以便按照正常工作方式控制PFC电路502工作，即开关管Q1根据来自PFC控制电路503的驱动电压而导通或截止，并让输入电流波形跟踪电压波形，同时PFC电路502的电感L2的辅助绕组感应出电压作为辅助电源输出电压。当脉冲信号是低电平时，PFC控制电路503被禁止工作。
采用本发明，就能仅仅在交流输入信号为低的时候使得交流电瞬时电压检测电路502才有可能发出高电平信号，以强迫PFC控制电路503处于工作状态，从而保证PFC电感辅助绕组输出电压为高。
本领域技术人员应该理解，PFC电路501和PFC控制电路503可以采用如图1和图2所述的现有的PFC电路及其控制电路，也可以采用其他合适的PFC电路及其控制电路。
图6示出了根据本发明实施例的交流电瞬时电压检测电路502的具体电路示意图。
如图6所示，交流电瞬时电压检测电路502包括第一和第二二极管D8和D9、稳压二极管ZD3以及三极管Q4。第一二极管D8的正极和第二二极管 D9的正极作为交流电瞬时电压检测电路502的输入端，接收来自交流电源的输入。第一二极管D8的正极耦合到交流电源的火线L端，第二二极管D9的正极耦合到交流电源的零线N端，第一二极管D8的负极和第二二极管D9的负极共同耦合到稳压二极管ZD3的负极，稳压二极管ZD3的正极耦合到三极管Q4的基极，三极管Q4的集电极作为交流电瞬时电压检测电路502的输出端，三极管Q4的发射极接地。
交流电瞬时电压检测电路502还包括第一至第四电阻器R37、R38、R39、R14。第一至第三电阻器R37-R39连接在第一二极管D8的负极和第二二极管D9的负极的连接点以及稳压二极管ZD3的负极之间，三极管Q4的集电极通过第四电阻器R14连接到供电电源Vcc。
交流电瞬时电压检测电路502检测其输入端接收的、来自交流电源的交流输入电压，当检测到输入电压的瞬时绝对值低于预定阈值时，交流电瞬时电压检测电路502通过其输出端输出高电平脉冲信号至PFC控制电路503，以使能PFC控制电路503正常工作。当检测到输入电压的瞬时绝对值高于预定阈值时，交流电瞬时电压检测电路502通过其输出端输出低电平脉冲信号，PFC控制电路503被禁止工作。
本领域技术人员应该理解，交流电瞬时电压检测电路502并不限于图6所示的电路，图6仅仅是交流电瞬时电压检测电路502的实现方式之一。能够实现本发明交流电瞬时电压检测电路502的功能的任何电路都在本发明的保护范围内。
图7A和7B是根据本发明实施例通过交流电瞬时电压检测电路502输出的脉冲信号对PFC控制电路503进行控制的方式。
图7A和7B中示出的PFC控制电路503为现有的L6562PFC控制器。
如图7A所示，可以将交流电瞬时电压检测电路502输出的脉冲信号直接输出到PFC控制电路503中的零电流检测器，以使能L6562PFC控制器的 电流过零点检测部分。或者，如图7B所示，可以将交流电瞬时电压检测电路502输出的脉冲信号直接输出到PFC控制电路503中的驱动器，以直接使能PFC脉冲输出部分。通过这两种方式施加使能信号都能强迫PFC控制电路503在交流输入电压高时不工作，而在交流输入电压的瞬时绝对值低于预定阈值时正常工作。
也即，在交流输入电压高时，PFC控制电路503不向PFC电路501内部的开关管Q1提供驱动电压；而在交流输入电压的瞬时绝对值低于预定阈值时，PFC控制电路503向PFC电路501内部的开关管Q1提供驱动电压。
本领域技术人员应该理解，PFC控制电路503并不限于图7所示的L6562PFC控制器，因此，对PFC控制电路503加使能信号的方式也不限于图7所示的方式。能够实现本发明的PFC控制电路503功能的任何电路以及对该PFC控制电路503加使能信号的各种方式都在本发明的保护范围内。
图8示出了根据本发明实施例的PFC电路自带辅助电源电路的控制方法流程图。
在步骤801，检测PFC电路的负载是高还是低。
在步骤802，当PFC电路的负载是低时，检测交流输入电压。
在步骤803，生成与交流输入电压同步的脉冲信号，并输出到PFC控制电路，其中，当交流输入电压的瞬时绝对值低于预定阈值时，所述脉冲信号为高电平；当交流输入电压的瞬时绝对值高于预定阈值时，所述脉冲信号为低电平。
在步骤804，所述脉冲信号控制PFC控制电路处于工作状态或者非工作状态，即当PFC控制电路接收到高电平脉冲信号时正常工作，当接收到低电平脉冲信号时不工作。
根据本发明实施例的PFC电路自带辅助电源电路的改进的控制装置具有交流输入电压瞬时值检测电路，并且交流电压瞬时值检测电路的输出信号被 输出到PFC控制电路中，并且在轻载下，在交流输入电压低时，该交流电压瞬时值检测电路输出高电平脉冲，而在重载下，屏蔽该交流电压瞬时值检测电路的此功能。
根据本发明实施例的改进的控制方法适用于利用PFC电路的辅助绕组作为辅助电源，并且要求PFC电路极轻载或者空载下这个辅助电源也能输出(待机状态有控制电路工作)。例如，灯具的驱动电路带有控制接收模块，在灯具关闭(主输出关闭)的时候，控制电路还要接收遥控信号。
上面是对本发明的说明，而不应被认为是对其的限制。尽管描述了本发明的若干示例性实施例，但本领域技术人员将容易地理解，在不背离本发明的新颖教学和优点的前提下可以对示例性实施例进行许多修改。因此，所有这些修改都意图包含在权利要求书所限定的本发明范围内。应当理解，上面是对本发明的说明，而不应被认为是限于所公开的特定实施例，并且对所公开的实施例以及其他实施例的修改意图包含在所附权利要求书的范围内。本发明由权利要求书及其等效物限定。

Claims (16)

  1. 一种PFC电路自带辅助电源电路，包括：
    PFC电路，接收来自交流电源的交流输入电压，并产生负载所需的直流输出电压以及辅助电源电压输出；
    PFC负载大小判断电路，接收来自PFC电路的直流输出，并根据该直流输出判断PFC电路的负载是高还是低，当判断PFC电路负载高时，向交流电瞬时电压检测电路输出屏蔽信号；
    交流电瞬时电压检测电路，接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，生成与交流输入电压同步的脉冲信号，并将该脉冲信号输出到PFC控制电路的使能端；
    PFC控制电路，当其使能端接收到高电平的脉冲信号时，按照正常工作方式控制PFC电路工作，当其使能端接收到低电平的脉冲信号时，处于非工作状态。
  2. 如权利要求1所述的PFC电路自带辅助电源电路，其中，当交流电瞬时电压检测电路检测到交流输入电压的瞬时绝对值低于预定阈值时，生成高电平的脉冲信号，而当交流电瞬时电压检测电路检测到交流输入电压的瞬时绝对值高于预定阈值时，生成低电平的脉冲信号。
  3. 如权利要求2所述的PFC电路自带辅助电源电路，交流电瞬时电压检测电路包括：
    第一和第二二极管，第一二极管的正极和第二二极管的正极作为交流电瞬时电压检测电路的输入端，接收来自交流电源的输入；第一二极管的正极耦合到交流电源的火线L端，第二二极管的正极耦合到交流电源的零线N端；
    稳压二极管，稳压二极管的负极耦合到第一二极管的负极和第二二极管的负极的连接点；
    三极管，三极管的基极耦合到稳压二极管的正极，三极管的集电极作为交流电瞬时电压检测电路的输出端，三极管的发射极接地。
  4. 如权利要求3所述的PFC电路自带辅助电源电路，交流电瞬时电压检测电路还包括：
    第一至第三电阻器，连接在第一二极管的负极和第二二极管的负极的连接点以及稳压二极管的负极之间；
    第四电阻器，三极管的集电极通过第四电阻器连接到供电电源。
  5. 如权利要求4所述的PFC电路自带辅助电源电路，其中，在所述PFC电路以及PFC负载大小判断电路之间还包括DC-DC转换器，PFC负载大小判断电路接收该DC-DC转换器的使能信号或者输出功率，并根据该使能信号或者输出功率来判断PFC电路的负载是高还是低。
  6. 如权利要求5所述的PFC电路自带辅助电源电路，交流电瞬时电压检测电路将脉冲信号直接输出到PFC控制电路中的驱动器，以直接使能PFC脉冲输出部分。
  7. 一种PFC电路自带辅助电源电路的控制装置，该PFC电路根据PFC 控制电路的控制进行工作，该控制装置包括：
    PFC负载大小判断电路，接收来自PFC电路的直流输出，并根据该直流输出判断PFC电路的负载是高还是低，当判断PFC电路负载高时，向交流电瞬时电压检测电路输出屏蔽信号；
    交流电瞬时电压检测电路，接收来自交流电源的交流输入电压，对交流输入电压的瞬时值进行检测，生成与交流输入电压同步的脉冲信号，并将该脉冲信号输出到PFC控制电路的使能端。
  8. 如权利要求7所述的控制装置，其中，当交流电瞬时电压检测电路检测到交流输入电压的瞬时绝对值低于预定阈值时，生成高电平的脉冲信号，而当交流电瞬时电压检测电路检测到交流输入电压的瞬时绝对值高于预定阈值时，生成低电平的脉冲信号。
  9. 如权利要求8所述的控制装置，其中，当交流电瞬时电压检测电路输出高电平的脉冲信号时，使能PFC控制电路按照正常工作方式控制PFC电路工作，当交流电瞬时电压检测电路输出低电平的脉冲信号时，禁止PFC控制电路工作。
  10. 如权利要求9所述的控制装置，交流电瞬时电压检测电路包括：
    第一和第二二极管，第一二极管的正极和第二二极管的正极作为交流电瞬时电压检测电路的输入端，接收来自交流电源的输入；第一二极管的正极耦合到交流电源的火线L端，第二二极管的正极耦合到交流电源的零线N端；
    稳压二极管，稳压二极管的负极耦合到第一二极管的负极和第二二极 管的负极的连接点；
    三极管，三极管的基极耦合到稳压二极管的正极，三极管的集电极作为交流电瞬时电压检测电路的输出端，三极管的发射极接地。
  11. 如权利要求10所述的控制装置，交流电瞬时电压检测电路还包括：
    第一至第三电阻器，连接在第一二极管的负极和第二二极管的负极的连接点以及稳压二极管的负极之间；
    第四电阻器，三极管的集电极通过第四电阻器连接到供电电源。
  12. 如权利要求11所述的控制装置，其中，在所述PFC电路以及PFC负载大小判断电路之间还包括DC-DC转换器，PFC负载大小判断电路接收该DC-DC转换器的使能信号或者输出功率，并根据该使能信号或者输出功率来判断PFC电路的负载是高还是低。
  13. 如权利要求11所述的控制装置，交流电瞬时电压检测电路将脉冲信号直接输出到PFC控制电路中的驱动器，以直接使能PFC脉冲输出部分。
  14. 一种PFC电路自带辅助电源电路的控制方法，该PFC电路根据PFC控制电路的控制进行工作，该控制方法包括：
    检测PFC电路的负载是高还是低；
    当检测到PFC电路的负载是低时，检测交流输入电压；
    生成与交流输入电压同步的脉冲信号，并输出到PFC控制电路；
    所述脉冲信号控制PFC控制电路处于工作状态或者非工作状态。
  15. 如权利要求14所述的控制方法，其中，当交流输入电压的瞬时绝 对值低于预定阈值时，所述脉冲信号为高电平；当交流输入电压的瞬时绝对值高于预定阈值时，所述脉冲信号为低电平。
  16. 如权利要求15所述的控制方法，其中，当接收到高电平脉冲信号时PFC控制电路正常工作，当接收到低电平脉冲信号时禁止PFC控制电路工作。
PCT/CN2014/089410 2014-06-26 2014-10-24 功率因数校正电路自带辅助电源电路及其控制方法和装置 WO2015196672A1 (zh)

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