WO2013063996A1 - 一种led光源的恒流驱动器 - Google Patents

一种led光源的恒流驱动器 Download PDF

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Publication number
WO2013063996A1
WO2013063996A1 PCT/CN2012/082255 CN2012082255W WO2013063996A1 WO 2013063996 A1 WO2013063996 A1 WO 2013063996A1 CN 2012082255 W CN2012082255 W CN 2012082255W WO 2013063996 A1 WO2013063996 A1 WO 2013063996A1
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WO
WIPO (PCT)
Prior art keywords
circuit
power conversion
backup
constant current
power supply
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Application number
PCT/CN2012/082255
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English (en)
French (fr)
Inventor
华桂潮
姜德来
Original Assignee
英飞特电子（杭州）股份有限公司
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Application filed by 英飞特电子（杭州）股份有限公司 filed Critical 英飞特电子（杭州）股份有限公司
Priority to US14/349,422 priority Critical patent/US9398665B2/en
Publication of WO2013063996A1 publication Critical patent/WO2013063996A1/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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 LED light source driving circuits, and more particularly to a constant current driver for an LED light source. Background technique
  • LED light source is used in more and more occasions due to its long life, high luminous efficiency and green environmental protection. Since the life of the LED light source itself is more than 50,000 hours, the main cause of the LED lamp failure is the failure of the constant current driver of the LED light source. Among the causes of failure of LED light source constant current driver, especially the failure of each semiconductor device is the most prominent. The main reason for the failure is that the LED light source itself is more serious.
  • the LED light source constant current driver is usually placed inside the lamp, close to the LED light source, high temperature. The working environment has a great influence on the operating characteristics of semiconductor devices.
  • an LED luminaire is generally only equipped with a constant current driver, and has low reliability.
  • the LED light source constant current driver fails and the LED lamp is turned off, the driver needs to be manually replaced, which is costly to repair, especially in some applications.
  • LED lamps used in tunnels and roads need to block the lanes in case of failure and need to be repaired, which brings inconvenience to the public, and there are certain safety hazards in the maintenance itself.
  • the prior art LED light source constant current driver has low reliability, resulting in a high cost of repairing it. Summary of the invention
  • the present invention provides the following solutions:
  • a constant current driver for an LED light source comprising a main power supply loop and at least one backup power supply loop, wherein the main power supply loop includes at least a power conversion circuit; and the power conversion circuit outputs a constant current to LED light source;
  • the backup power supply circuit includes at least a power conversion backup circuit; the power conversion backup circuit outputs a constant current to the LED light source;
  • any one of them works in a rated state or a derated state, and the output ends of the two are connected in parallel to supply power to the LED light source; the power conversion circuit and the When any one of the power conversion backup circuits fails, the failed circuit does not affect the normal operation of the remaining circuits.
  • the input of the power conversion backup circuit is coupled in parallel with the input of the power conversion circuit.
  • the power conversion circuit includes a series branch composed of a power factor correction circuit and a constant current circuit, and an output end of the power factor correction circuit is connected to an input end of the constant current circuit, and an output end of the constant current circuit Connecting an LED light source as an output end of the power conversion circuit;
  • An input end of the power conversion backup circuit is connected in parallel with an input end of the constant current circuit.
  • the power conversion circuit includes a power factor correction circuit and a series branch of the constant current circuit, and an output end of the power factor correction circuit is connected to an input end of the constant current circuit, and an output end of the constant current circuit is used as The output end of the power conversion circuit is connected to the LED light source; or the power conversion circuit is a single-stage power factor correction circuit.
  • the main power supply circuit further includes a rectifier circuit, and an output end of the rectifier circuit is connected to the power conversion circuit.
  • the backup power supply circuit further includes a rectification backup circuit, and an output end of the rectification backup circuit is connected to an input end of the power conversion backup circuit;
  • the series branch composed of the rectification backup circuit and the power conversion backup circuit and the series branch composed of the rectification circuit and the power conversion circuit are connected in parallel with each other.
  • a disconnecting device is connected in a branch of the device in the power factor correction circuit where the potential for short circuit is dangerous.
  • the breaking device in the branch where the device is located is disconnected when the power factor is corrected.
  • the constant current driver operates in an uncontrolled rectification state without a power factor correction function.
  • the booster circuit A first diode (D1) is connected across the input end and the output end, and an anode of the first diode (D1) is connected to an input end of the booster circuit, and a cathode of the first diode (D1) Connected to the output of the boost circuit.
  • the set operating current of the power conversion circuit is 100% or 50% of the rated operating current, and the power conversion backup circuit is configured.
  • the operating current is 100% or 50% of its rated operating current.
  • the constant current driver further includes a current adjustment circuit, configured to determine the power conversion When there is a circuit failure in the circuit and the power conversion backup circuit, the output signal is sent to the remaining circuit to increase its output current.
  • the current adjustment circuit includes a current detection circuit that detects whether a current (Io) of the power conversion circuit and the output of the power conversion backup circuit is decreased in parallel, and when the detection result of the current detection circuit is The current regulating circuit increases the output current of the power conversion circuit and/or the power conversion backup circuit operating in the derated state to a rated current.
  • a fuse is connected in series between the main power supply circuit and the backup power supply circuit.
  • the main power supply circuit and the backup power supply circuit are connected in series with a separation circuit; when the circuit of the separation circuit is working normally, the separation circuit is turned on; when the circuit of the separation circuit is faulty, The separation circuit functions to separate the failed supply circuit and the remaining supply circuit.
  • the separation circuit comprises: a diode, a semiconductor switching device or a relay.
  • the main power supply circuit and the backup power supply circuit are packaged in the same box. According to a specific embodiment provided by the present invention, the present invention discloses the following technical effects:
  • the constant current driver of the LED light source of the invention has a backup power supply loop, so when the main power supply loop of the constant current driver fails, the backup power supply circuit can continue to supply power to the LED light source, so that the LED light source works normally, and the LED light source is improved.
  • the reliability of the constant current drive is improved.
  • the backup power supply circuit can only set up a backup circuit for the circuit including the semiconductor in the main power supply circuit, that is, partial backup, and the local backup cost is low, so the reliability of the whole of the LED driver can be greatly improved, and the backup cost can be reduced.
  • main power supply circuit and the backup power supply circuit are packaged together to share the same outer casing, which reduces structural components and PCBs, further saving device cost and production cost.
  • FIG. 1 is a structural diagram of a constant current driver of an LED light source according to Embodiment 1 of the present invention
  • FIG. 2 is a structural diagram of a constant current driver of an LED light source according to Embodiment 2 of the present invention.
  • FIG. 3 is a structural diagram of a constant current driver of an LED light source according to Embodiment 3 of the present invention.
  • FIG. 4 is a structural diagram of a constant current driver of an LED light source according to Embodiment 4 of the present invention.
  • FIG. 5 is a structural diagram of a constant current driver of an LED light source according to Embodiment 5 of the present invention.
  • Fig. 6 is a structural diagram showing a constant current driver of an LED light source according to Embodiment 6 of the present invention. detailed description
  • Fig. 1 is a structural diagram showing a constant current driver of an LED light source according to a first embodiment of the present invention.
  • the constant current driver includes: a main power supply circuit and at least one backup power supply circuit, the main power supply circuit at least includes a power conversion circuit 101; the power conversion circuit 101 outputs a constant current to the LED light source 20;
  • the backup power supply circuit includes at least a power conversion backup circuit 102; the power conversion backup circuit 102 outputs a constant current to the LED light source 20;
  • any one of them works in a rated state or a derated state, and the output ends of the two are connected in parallel to supply power to the LED light source 20;
  • the failure circuit does not affect the normal operation of the remaining circuit.
  • the power conversion circuit and the power conversion backup circuit output a constant current means that the output current is controlled and may be rippled.
  • Rated state here refers to the output current of the power conversion circuit and the power conversion backup circuit is the rated current.
  • the derating state is relative to the rated state.
  • the output current of the power conversion circuit and the power conversion backup circuit is smaller than the rated current.
  • the input end of the power conversion backup circuit 102 and the input end of the power conversion circuit 101 are connected in parallel.
  • the working principle of the constant current driver of the LED light source of the present invention is as follows:
  • the backup power supply circuit supplies power to the LED load together with the main power supply circuit.
  • the backup power supply circuit still works normally, and the output current supplies power to the LED load.
  • the backup power supply circuit includes a power conversion backup circuit, and the power conversion backup circuit is connected in parallel at both ends of the power conversion circuit in the main power supply circuit: when the main power supply circuit works normally, the power conversion circuit and The power conversion backup circuit can respectively output 50% of the LED load current Io;
  • the current of the LED load is the current output by the power conversion backup circuit, and the current value is 50% Io.
  • the output current loop of the power conversion backup circuit can be adjusted by adjusting the reference of the output current loop in the power conversion backup circuit.
  • the output current of the backup power supply loop is increased from the original 50% Io. Up to 100% Io, or 70 ⁇ 80% Io. In this way, the LED load current can always be maintained at a higher output current regardless of whether the main power supply circuit fails.
  • main power supply circuit and the backup power supply circuit are relatively speaking, and the above description assumes that the main power supply circuit fails first. In the actual situation, when the backup power supply circuit fails first, the main power supply circuit plays a "backup" role.
  • the work The set operating current of the rate conversion circuit may be 100% or 50% of its rated working current
  • the set operating current of the power conversion backup circuit may be 100% or 50% of its rated working current
  • the constant current driver of the LED light source of the present invention has a backup power supply loop, so when the main power supply loop of the constant current driver fails, the backup power supply circuit can continue to supply power to the LED light source, so that the LED light source works normally. , improve the reliability of the constant current driver of the LED light source.
  • the power conversion circuit may have multiple implementation manners, for example: the power conversion circuit includes a power factor correction circuit and a series branch of the constant current circuit, and an output end of the power factor correction circuit is connected to the constant current circuit.
  • the output end of the constant current circuit is connected to the LED light source as an output end of the power conversion circuit; or the power conversion circuit is a single-stage power factor correction circuit.
  • the backup power supply circuit can also be implemented in multiple ways.
  • Fig. 2 is a structural diagram showing a constant current driver of an LED light source according to a second embodiment of the present invention. As shown in FIG. 2, the constant current driver includes:
  • a power conversion circuit 101 a power branch backup circuit 102; a series branch, an output end of the power factor correction circuit 1012 is connected to an input end of the constant current circuit 1011, and an output end of the constant current circuit 1011 is used as the power
  • the output end of the conversion circuit 101 is connected to the LED light source 20;
  • the input of the power conversion backup circuit 102 is connected in parallel with the input of the constant current circuit 1011.
  • This embodiment is a partial backup mode.
  • the power conversion backup circuit 102 is mainly used for backing up the constant current circuit 1011.
  • the constant current driver can still be used.
  • a disconnecting device is connected in a branch of a device in which the potential short circuit is dangerous in the power factor correction circuit, and when the device in the power factor correction circuit fails, the constant The stream driver operates in an uncontrolled rectification state without power factor correction.
  • the breaking device is disconnected.
  • the breaking device can be a fast blow fuse.
  • FIG. 3 is a structural diagram of a constant current driver of an LED light source according to Embodiment 3 of the present invention.
  • the difference between the embodiment shown in FIG. 3 and FIG. 2 is mainly that when the power factor correction circuit 1012 uses the booster circuit 1013 as the main circuit, the anodes of the diodes D1 and D1 are connected across the input terminal and the output terminal. At the end, the cathode of D1 is connected to the output terminal.
  • the booster circuit 1013 is working normally, since the output voltage of the booster circuit 1013 is greater than the input voltage, and the output voltage is substantially constant, the diode D1 is subjected to a reverse voltage drop.
  • D1 does not provide a current path.
  • the boosting circuit 1013 implements a power factor correction function; when the boosting circuit fails, both ends of the D1 provide a path for receiving the open circuit voltage of the boosting circuit, and therefore, the constant current driving device operates without a power factor correction function. Rectified state.
  • Fig. 4 is a structural diagram showing a constant current driver of an LED light source according to Embodiment 4 of the present invention.
  • the main power supply circuit further includes a rectifier circuit 1014, and an output end of the rectifier circuit 1014 is connected.
  • the backup power supply circuit further includes a rectification backup circuit 1024, and an output end of the rectification backup circuit 1024 is connected to an input end of the power conversion backup circuit 102;
  • the series branch of the rectification backup circuit 1024 and the power conversion backup circuit 102 and the series branch of the rectification circuit 1014 and the power conversion circuit 1011 are connected in parallel with each other.
  • the premise of this embodiment is that at most one of the power conversion circuit and the power conversion backup circuit is a non-isolated circuit, because if both are non-isolated circuits, that is, the two are common, when the rectifier circuit When the short circuit fails, the rectifier backup circuit is also short-circuited, so that it does not function as a backup. That is, when the power conversion circuit and the power conversion backup circuit are both non-isolated switching power supply topologies, the backup power supply circuit does not include a rectifier backup circuit. It should be noted that when the constant current driver of the LED light source includes more than one power supply circuit, at most one of the power conversion circuit and the plurality of power conversion backup circuits is a non-isolated circuit.
  • Fig. 5 is a structural diagram showing a constant current driver of an LED light source according to Embodiment 5 of the present invention.
  • the constant current driver When at least one of the power conversion circuit and the power conversion backup circuit operates in a derating state (setting the operating current to be lower than its own rated operating current), as shown in FIG. 5: the constant current driver further includes a current regulating circuit 104. And determining that when the power conversion circuit and the power conversion backup circuit have a circuit failure, outputting a signal to the remaining circuit to improve the output current thereof.
  • the current regulating circuit 104 detects the magnitude of the output current after the power conversion circuit and the power conversion backup circuit are connected in parallel, when the output current is detected to decrease
  • the output signal is output to the power conversion circuit 101 and/or the power conversion backup circuit 102 operating in the derated state, so that the output current thereof rises to min (rated current, 11+12), where II is The output current of the power conversion circuit, 12 is the output current of the power conversion backup circuit, and finally the input current of the LED light source does not change too much due to the failure of a certain circuit of the previous stage.
  • the current adjustment circuit 104 may include: a current detection circuit that detects whether the current (Io) of the power conversion circuit and the output of the power conversion backup circuit is decreased in parallel; when the detection result of the current detection circuit In the case of YES, the current regulating circuit increases the output current of the power conversion circuit and/or the power conversion backup circuit operating in the derated state to the rated current.
  • An output of the current regulating module is coupled to a current loop or dimming light of the power conversion circuit and/or the power conversion backup circuit for increasing an output current.
  • the constant current driver of the LED light source of the present invention may include a power supply circuit, and may also include a multi-way backup power supply circuit.
  • each backup power supply circuit may be the same or different.
  • the first backup power supply loop may only include a power conversion backup circuit
  • the second backup power supply loop may include a rectifier backup circuit and a power conversion backup circuit connected in series.
  • the number of power conversion backup circuits may be one or multiple. When there are multiple power conversion backup circuits, multiple power conversion backup circuits are connected in parallel.
  • the backup power supply circuit may include two power conversion backup circuits, which are connected in parallel with each other.
  • the remaining power conversion backup circuit can still work normally. This can further reduce the failure rate of the LED light source constant current driver and improve its reliability.
  • the number of the same backup circuit in the backup power supply circuit is not limited, and the more the number of the same backup circuit, the higher the circuit reliability of the LED light source constant current driver.
  • the rectifying circuit and the rectifying backup circuit may adopt the same circuit or different circuits as long as the input AC power is converted into the pulsating DC power.
  • the power conversion circuit and the power conversion backup circuit may use the same switching power supply topology, or may use different switching power supply topologies, as long as the pulsating direct current is converted into a constant current output.
  • the power conversion circuit may be a single-stage circuit or a multi-stage circuit;
  • the power conversion backup circuit may also be a single-stage circuit or a multi-stage circuit, and the constant current circuit may be a single-stage circuit or a multi-stage circuit.
  • the separation circuit can also be connected in series between the main power supply circuit and the backup power supply circuit.
  • the separation circuit is turned on; when the circuit where the separation circuit is located fails, the separation circuit functions to separate the failed power supply circuit and the remaining power supply circuit.
  • the separation circuit may be a fuse, a diode, or a controllable device such as a semiconductor switching device or a relay.
  • the semiconductor switching device may be a MOS transistor, a triode, an IGBT or the like.
  • a fast-blow fuse may be selected.
  • the fuse connected in series in the branch is blown, so that the short-circuit branch is disconnected. None affect the normal operation of the remaining power supply loop.
  • the single-conductivity of the diode is utilized to separate the current from the cathode to the anode of the diode;
  • the separation circuit When the separation circuit is a controlled device such as a semiconductor switching device or a relay, it is separated by controlling its disconnection, and the switching of the controlled device is determined by its own controlled terminal (such as the gate of the MOS transistor). Therefore, the control circuit of the controlled terminal receives the notification signal of the failure of the loop in which the controlled device is located.
  • a controlled device such as a semiconductor switching device or a relay
  • the current output terminals of the main power supply circuit and the backup power supply circuit are connected in series with diodes.
  • the backup power supply circuit may be any of the above circuit structures, which is not limited herein.
  • Fig. 6 is a structural diagram showing a constant current driver of an LED light source according to Embodiment 6 of the present invention.
  • the isolation circuit is a diode
  • the anode of the isolation diode D2 is connected to the current output terminal of the power conversion circuit 101
  • the cathode of the isolation diode D2 is connected to the anode of the LED light source 20.
  • the anode of the isolation diode D3 is connected to the current output terminal of the power conversion backup circuit 102
  • the cathode of the isolation diode D3 is connected to the anode of the LED light source 20.
  • the circuit connection mode in this embodiment can ensure that the remaining power supply circuit can work normally after a certain branch fails.
  • the output end of the power conversion circuit 101 is connected to the output terminal of the power conversion backup circuit 102 through the isolation diode D2, and the normal operation of the power conversion backup circuit 102 may not be affected.
  • the output of the power conversion circuit 101 is short-circuited, due to the single-conductivity of the isolation diode D2, the output terminals of the power conversion backup circuit 102 are not short-circuited together to ensure normal operation.
  • the input end of the rectifier circuit may further be connected to an electromagnetic interference suppression circuit;
  • An input terminal of the electromagnetic interference suppression circuit is connected to the alternating current.
  • the electromagnetic interference suppression circuit can suppress interference caused by an external electromagnetic field or electromagnetic wave to the constant current driver.
  • all the original components of the constant current driver of the LED light source of the present invention can be integrally packaged in a single casing. That is, the main power supply circuit and the backup power supply circuit are packaged in the same box. Since a single housing is shared, structural components and PCBs are reduced, which further saves device cost and production cost.
  • the main power supply circuit and each backup power supply circuit may also be independently packaged.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本发明公开一种LED光源的恒流驱动器，包括主供电回路和至少一路备份供电回路，所述主供电回路至少包括功率变换电路；所述功率变换电路输出恒定电流给LED光源；所述备份供电回路至少包括功率变换备份电路；所述功率变换备份电路输出恒定电流给LED光源；所述功率变换电路和所述功率变换备份电路正常工作时，其中的任意一者工作在额定状态或者降额状态，两者的输出端并联后同时给LED光源供电；所述功率变换电路和所述功率变换备份电路中任意一者失效时，失效电路不会影响剩余电路的正常工作。采用本发明的LED光源的恒流驱动器，由于具有备份供电回路，所以可以提高LED光源的恒流驱动器的可靠性。

Description

一种 LED光源的恒流驱动器
本申请要求 2011 年 10 月 31 日提交中国专利局、 申请号为 201110338418.X、 发明名称为 "一种 LED光源的恒流驱动器"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
本发明涉及 LED光源驱动电路领域，特别是涉及一种 LED光源的恒流驱动 器。 背景技术
LED光源以其寿命长、 光效高、 绿色环保等优势应用于越来越多的场合。 由于 LED光源本身寿命在 50000小时以上， LED灯发生故障的主要原因是 LED 光源的恒流驱动器失效造成的。 LED光源恒流驱动器的故障原因中， 尤以各半 导体器件的失效最为突出，究其失效原因主要是， LED光源自身发热比较严重， LED光源恒流驱动器通常放置在灯具内部， 靠近 LED光源， 高温工作环境对半 导体器件的工作特性影响很大。
现有技术中， 一个 LED灯具一般只配备一个恒流驱动器， 可靠性低。 当 LED光源恒流驱动器发生故障造成 LED灯具灭灯时， 需要人工替换驱动器， 维 修成本高， 特别是在某些应用场合， 更是如此。 例如， 应用于隧道和道路上的 LED灯具，一旦发生故障需要维修时，势必要封锁车道，给大众行车带来不便， 而且维修本身也存在一定的安全隐患。 总的来说， 现有技术中的 LED光源恒流 驱动器可靠性低， 导致对其进行维修的成本较高。 发明内容
本发明的目的是提供一种 LED光源的恒流驱动器， 能够具有较高的可靠 性， 当某个元件发生故障时， LED光源仍可继续工作。
为实现上述目的， 本发明提供了如下方案：
一种 LED光源的恒流驱动器，包括主供电回路和至少一路备份供电回路， 所述主供电回路至少包括功率变换电路； 所述功率变换电路输出恒定电流给 LED光源；
所述备份供电回路至少包括功率变换备份电路；所述功率变换备份电路输 出恒定电流给 LED光源；
所述功率变换电路和所述功率变换备份电路正常工作时，其中的任意一者 工作在额定状态或者降额状态， 两者的输出端并联后同时给 LED光源供电； 所述功率变换电路和所述功率变换备份电路中任意一者失效时，失效电路 不会影响剩余电路的正常工作。
优选的，所述功率变换备份电路的输入端和所述功率变换电路的输入端并 联。
优选的，所述功率变换电路包括功率因数校正电路和恒流电路组成的串联 支路， 所述功率因数校正电路的输出端连接所述恒流电路的输入端， 所述恒流 电路的输出端作为所述功率变换电路的输出端连接 LED光源；
所述功率变换备份电路的输入端和所述恒流电路的输入端并联。
优选的， 所述功率变换电路包括功率因数校正电路和恒流电路的串联支 路， 所述功率因数校正电路的输出端连接所述恒流电路的输入端， 所述恒流电 路的输出端作为所述功率变换电路的输出端连接 LED光源； 或者， 所述功率 变换电路为单级功率因数校正电路。
优选的，当所述功率变换电路和所述功率变换备份电路中至少有一者为隔 离型电路时， 所述主供电回路还包括整流电路， 所述整流电路的输出端连接所 述功率变换电路的输入端；
所述备份供电回路还包括整流备份电路，所述整流备份电路的输出端连接 所述功率变换备份电路的输入端；
所述整流备份电路和所述功率变换备份电路组成的串联支路与所述整流 电路和所述功率变换电路组成的串联支路相互并联。
优选的，在所述功率因数校正电路中潜在短路危险的器件的所在支路中连 接有分断器件， 当有器件短路时， 该器件所在支路中的分断器件断开， 当所述 功率因数校正电路中的器件失效后，所述的恒流驱动器工作在没有功率因数校 正功能的不控整流状态。
优选的， 所述功率因数校正电路采用升压电路为主电路时， 所述升压电路 的输入端和输出端之间跨接有第一二极管（D1 ), 第一二极管（D1 )的阳极接 所述升压电路的输入端， 第一二极管 （D1 )的阴极接所述升压电路的输出端。
优选的， 当所述功率变换电路和所述功率变换备份电路正常工作时， 所述 功率变换电路的设定工作电流为自身额定工作电流的 100%或者 50%, 所述功 率变换备份电路的设定工作电流为自身额定工作电流的 100%或者 50%。
优选的，当功率变换电路和功率变换备份电路两者中的至少一者的设定工 作电流低于自身额定工作电流时， 所述恒流驱动器还包括电流调节电路， 用于 判断所述功率变换电路和所述功率变换备份电路中有电路失效时，输出信号至 剩余电路， 提高其输出电流。
优选的， 所述电流调节电路包括，检测所述功率变换电路和所述功率变换 备份电路输出端并联后的电流（Io )是否下降的电流检测电路， 当所述电流检 测电路的检测结果为是时，所述电流调节电路将工作在降额状态的功率变换电 路和 /或功率变换备份电路的输出电流提高至额定电流。
优选的， 所述主供电回路和所述备份供电回路中串接有保险丝。
优选的， 所述主供电回路和所述备份供电回路中串接有分离电路； 当所述 分离电路所在回路正常工作时， 所述分离电路导通； 当所述分离电路所在回路 发生故障时， 所述分离电路起到分离失效供电回路和剩余供电回路的作用。
优选的， 所述分离电路包括： 二极管、 半导体开关器件或继电器。
优选的， 所述主供电回路和所述备份供电回路封装在同一盒体中。 根据本发明提供的具体实施例， 本发明公开了以下技术效果：
本发明的 LED光源的恒流驱动器， 由于具有备份供电回路， 所以当恒流 驱动器的主供电回路发生故障时，备份供电回路还可以继续为 LED光源供电， 使 LED光源正常工作， 提高了 LED光源的恒流驱动器的可靠性。
此外，备份供电回路可以只对主供电回路中包含半导体的电路，设置备份 电路， 即局部备份， 局部备份成本低， 所以在大幅度提高 LED驱动器的整机 可靠性的同时， 还可以降低备份成本。
最后， 主供电回路和备份供电回路封装在一起， 共用同一个外壳， 减少了 结构件和 PCB, 进一步节约了器件成本和生产成本。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是 本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性 的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例 1的 LED光源的恒流驱动器结构图；
图 2为本发明实施例 2的 LED光源的恒流驱动器结构图；
图 3为本发明实施例 3的 LED光源的恒流驱动器结构图；
图 4为本发明实施例 4的 LED光源的恒流驱动器结构图；
图 5为本发明实施例 5的 LED光源的恒流驱动器结构图；
图 6为本发明实施例 6的 LED光源的恒流驱动器结构图。 具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
为使本发明的上述目的、特征和优点能够更加明显易懂， 下面结合附图和 具体实施方式对本发明作进一步详细的说明。
图 1为本发明实施例 1的 LED光源的恒流驱动器结构图。 如图 1所示， 该恒流驱动器包括： 包括主供电回路和至少一路备份供电回路， 所述主供电回 路至少包括功率变换电路 101 ; 所述功率变换电路 101输出恒定电流给 LED 光源 20;
所述备份供电回路至少包括功率变换备份电路 102; 所述功率变换备份电 路 102输出恒定电流给 LED光源 20;
所述功率变换电路 101和所述功率变换备份电路 102正常工作时，其中的 任意一者工作在额定状态或者降额状态， 两者的输出端并联后同时给 LED光 源 20供电； 所述功率变换电路和所述功率变换备份电路中任意一者失效时，失效电路 不会影响剩余电路的正常工作。
所述功率变换电路和所述功率变换备份电路输出恒定电流是指，其输出电 流受控， 可能带有纹波。
额定状态，这里是指功率变换电路和功率变换备份电路的输出电流为额定 电流。
降额状态，是相对额定状态而言的， 这里是指功率变换电路和功率变换备 份电路的输出电流小于额定电流。
本实施例中， 所述功率变换备份电路 102 的输入端和所述功率变换电路 101的输入端并联。
下面对本发明的 LED光源的恒流驱动器工作原理介绍如下：
当主供电回路正常工作时， 由于备份供电回路与主供电回路相互并联， 即 相当于两个恒流源并联，则备份供电回路同主供电回路一起给 LED负载供电。
当主供电回路发生故障， 无法输出电流时， 备份供电回路依然正常工作， 输出电流给 LED负载供电。
现举例说明备份供电回路的工作状态，假设备份供电回路包括功率变换备 份电路， 该功率变换备份电路并联在主供电回路中的功率变换电路的两端： 当主供电回路正常工作时，功率变换电路和功率变换备份电路可以分别输 出 LED负载电流 Io的 50 %;
当主供电回路发生故障， 无法输出电流时， LED 负载的电流大小即为功 率变换备份电路输出的电流， 电流值大小为 50%Io。 当然此时也可以通过调整 功率变换备份电路中输出电流环的基准， 增大该功率变换备份电路的输出电 流， 一旦主供电回路失效时， 将备份供电回路的输出电流从原来的 50%Io提 高至额定输出 100%Io,或者 70〜80%Io。这样，无论主供电回路是否失效， LED 负载电流可以始终维持在较高的输出电流。
需要说明的是， 主供电回路和备份供电回路是相对而言的， 上述说明都是 假设主供电回路先失效而言的。 实际情况中， 当备份供电回路先失效时， 主供 电回路就起到 "备份" 作用。
此外， 当所述功率变换电路和所述功率变换备份电路正常工作时， 所述功 率变换电路的设定工作电流可以为自身额定工作电流的 100%或者 50%, 所述 功率变换备份电路的设定工作电流可以为自身额定工作电流的 100%或者 50%。
综上所述， 本发明的 LED光源的恒流驱动器， 由于具有备份供电回路， 所以当恒流驱动器的主供电回路发生故障时，备份供电回路还可以继续为 LED 光源供电， 使 LED光源正常工作， 提高了 LED光源的恒流驱动器的可靠性。
实际应用中， 功率变换电路可以有多种实现方式， 例如： 所述功率变换电 路包括功率因数校正电路和恒流电路的串联支路，所述功率因数校正电路的输 出端连接所述恒流电路的输入端，所述恒流电路的输出端作为所述功率变换电 路的输出端连接 LED光源； 或者， 所述功率变换电路为单级功率因数校正电 路。
实际应用中， 备份供电回路也可以有多种实现方式。
图 2为本发明实施例 2的 LED光源的恒流驱动器结构图。 如图 2所示， 该恒流驱动器包括：
功率变换电路 101 ; 功率变换备份电路 102; 的串联支路，所述功率因数校正电路 1012的输出端连接所述恒流电路 1011的 输入端， 所述恒流电路 1011的输出端作为所述功率变换电路 101的输出端连 接 LED光源 20;
所述功率变换备份电路 102的输入端和所述恒流电路 1011的输入端并联。 本实施例为一种局部备份方式。本实施例中， 功率变换备份电路 102主要 用于对恒流电路 1011进行备份。 当恒流电路 1011失效时， 由于功率变换备份 电路 102还可以工作， 所以恒流驱动器仍然可以使用。
需要说明的是， 本实施例中，在所述功率因数校正电路中潜在短路危险的 器件的所在支路中连接有分断器件， 当所述功率因数校正电路中的器件失效 后， 所述的恒流驱动器工作在没有功率因数校正功能的不控整流状态。 当分断 器件所在支路有器件短路时，分断器件断开。分断器件可以为快速熔断保险丝。
本实施例公开的局部备份方式在节约一定成本的基石出上，提高了所述恒流 驱动器的可靠性。 图 3为本发明实施例 3的 LED光源的恒流驱动器结构图。 图 3与图 2所 示的实施例的区别主要在于， 当功率因数校正电路 1012 采用升压电路 1013 为主电路时， 其输入端和输出端之间跨接有二极管 Dl , D1的阳极接输入端， D1的阴极接输出端。 当升压电路 1013正常工作时， 由于升压电路 1013的输 出电压大于输入电压， 且输出电压基本稳定不变， 二极管 D1承受反向压降， 依据二极管的单向导通性， D1不提供电流通路， 升压电路 1013实现功率因数 校正功能； 当升压电路故障时， D1 两端因承受升压电路的开路电压而提供通 路， 因此， 所述恒流驱动器工作在没有功率因数校正功能的不控整流状态。
图 4为本发明实施例 4的 LED光源的恒流驱动器结构图。 当所述功率变 换电路和所述功率变换备份电路中至多有一者为非隔离型电路时， 如图 4 所 示， 所述主供电回路还包括整流电路 1014, 所述整流电路 1014的输出端连接 所述功率变换电路 1011的输入端；
所述备份供电回路还包括整流备份电路 1024, 所述整流备份电路 1024的 输出端连接所述功率变换备份电路 102的输入端；
所述整流备份电路 1024和所述功率变换备份电路 102组成的串联支路与 所述整流电路 1014和所述功率变换电路 1011组成的串联支路相互并联。
需要说明的是，本实施例的前提是功率变换电路和功率变换备份电路中至 多有一者为非隔离型电路， 原因是， 若两者都为非隔离电路， 即两者共地， 当 整流电路短路失效时， 会把整流备份电路也短路， 这样就起不到备份的作用。 即当功率变换电路和功率变换备份电路都是非隔离开关电源拓朴时，备份供电 回路不包括整流备份电路。 需要说明的是， 当 LED光源的恒流驱动器包括多 ^^份供电回路时，功率变换电路和多个功率变换备份电路中至多有一个为非 隔离型电路。
图 5为本发明实施例 5的 LED光源的恒流驱动器结构图。 当功率变换电 路和功率变换备份电路两者中的至少一者工作在降额状态（设定工作电流低于 自身额定工作电流） 时， 如图 5所示： 恒流驱动器还包括电流调节电路 104, 用于判断所述功率变换电路和所述功率变换备份电路中有电路失效时，输出信 号至剩余电路，提高其输出电流。 当电流调节电路 104通过检测所述功率变换 电路和功率变换备份电路并联后的输出电流的大小，当检测到其输出电流下降 时即可判断有电路失效， 输出信号至工作在降额状态的功率变换电路 101 和 / 或功率变换备份电路 102, 使其输出电流上升至 min (额定电流， 11+12), 其中， II 为功率变换电路的输出电流， 12 为功率变换备份电路的输出电流， 最终使 得 LED光源的输入电流不会因前级某一电路的失效而变化太大。
具体的， 所述电流调节电路 104可以包括： 检测所述功率变换电路和所述 功率变换备份电路输出端并联后的电流（Io )是否下降的电流检测电路； 当所 述电流检测电路的检测结果为是时，所述电流调节电路将工作在降额状态的功 率变换电路和 /或功率变换备份电路输出电流提高至额定电流。
所述电流调节模块的输出端连接所述功率变换电路和 /或所述功率变换备 份电路的电流环或调光线， 用于增大输出电流。
需要说明的是， 本发明中的 LED光源的恒流驱动器可以包括一 份供 电回路， 也可以包括多路备份供电回路。 当包括多路备份供电回路时， 各备份 供电回路可以相同， 也可以不同。 例如， 第一路备份供电回路可以只包括功率 变换备份电路，第二 备份供电回路可以包括串联在一起的整流备份电路和功 率变换备份电路。
所述备份供电回路中， 功率变换备份电路的个数， 可以是一个， 也可以是 多个。 当功率变换备份电路为多个时， 多个功率变换备份电路并联。
具体的， 备份供电回路可以包括两个功率变换备份电路， 两者相互并联。 当主供电回路中的功率变换电路和一个功率变换备份电路均发生故障时，剩余 的功率变换备份电路依然可以正常工作。 这样可以进一步降低 LED光源恒流 驱动器的失效率， 提高其可靠性。
总之， 本发明中， 并不限定备份供电回路中同一种备份电路的个数， 同一 种备份电路的个数越多， LED光源恒流驱动器的电路可靠性越高。
在具体实施本发明的方案时，所述整流电路和所述整流备份电路可以采用 相同的电路，也可以采用不同的电路， 只要满足将输入交流电转换为脉动直流 电即可。 所述功率变换电路和所述功率变换备份电路， 可以采用相同的开关电 源拓朴 ， 也可以采用不同的开关电源拓朴， 只要满足将脉动直流电转换为恒 流输出即可。
实际应用中， 所述功率变换电路可以是单级电路， 也可以是多级电路； 所 述功率变换备份电路，也可以是单级电路或者多级电路， 所述恒流电路可以是 单级电路， 也可以是多级电路。
实际应用中， 为确保某一供电回路故障时， 不影响剩余供电回路的正常工 作， 则主供电回路和备份供电回路中还可以串接分离电路。 当分离电路所在回 路正常工作时， 该分离电路导通； 当分离电路所在回路失效时， 该分离电路起 到分离失效供电回路和剩余供电回路的作用。
所述分离电路可以是保险丝、 二极管， 也可以是半导体开关器件、 继电器 等可控器件。 所述半导体开关器件可以是 MOS管、 三极管、 IGBT等。
当分离电路选用保险丝时， 进一步的， 可以选用快速熔断保险丝， 一旦某 一供电回路中的某一支路发生故障短路时， 串联在该支路中的保险丝熔断，使 得该短路支路断开， 从而不影响剩余供电回路的正常工作。
当分离电路选用二极管时，是利用二极管的单向导通性，从二极管的阴极 至阳极的电流方向上起到分离作用；
当所述分离电路为半导体开关器件或继电器等受控器件时，是通过控制其 断开来起到分离作用，受控器件的通断由自身的受控端（比如 MOS管的栅极） 决定， 因此， 所述受控端的驱动电路接收受控器件所在回路失效的通知信号。
例如，主供电回路和备份供电回路的电流输出端各自串接有二极管后再相 连。 所述备份供电回路可以是上述任何电路结构， 在此不做限定。
图 6为本发明实施例 6的 LED光源的恒流驱动器结构图。 如图 6所示， 此实施例中，隔离电路为二极管，隔离二极管 D2的阳极连接功率变换电路 101 的电流输出端； 隔离二极管 D2的阴极连接 LED光源 20的阳极。 隔离二极管 D3的阳极连接功率变换备份电路 102的电流输出端， 隔离二极管 D3的阴极 连接 LED光源 20的阳极。 本实施例中的电路连接方式， 可以确保某一支路失 效后， 剩余的供电回路能正常工作。 例如， 当功率变换电路 101发生故障不输 出电流时， 功率变换电路 101的输出端通过隔离二极管 D2与功率变换备份电 路 102的输出端相连， 可以不影响功率变换备份电路 102的正常工作。 当功率 变换电路 101的输出端短路时， 由于隔离二极管 D2的单向导通性， 不会把功 率变换备份电路 102的输出端一起短路， 保证其能正常工作。
实际应用中， 所述整流电路的输入端还可以连接电磁干扰抑制电路； 所述 电磁干扰抑制电路的输入端连接所述交流电。 所述电磁干扰抑制电路， 可以抑 制外部电磁场或电磁波对恒流驱动器造成的干扰。
实际应用中， 本发明的 LED光源的恒流驱动器的全部原件， 可以整体封 装在一个盒体中。 即所述主供电回路和所述备份供电回路封装在同一盒体中。 由于共用一个外壳， 所以减少了结构件与 PCB, 可以进一步节约了器件成本 和生产成本。 所述主供电回路和各备份供电回路也可以各自独立封装。 本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是 与其他实施例的不同之处， 各个实施例之间相同相似部分互相参见即可。 例的说明只是用于帮助理解本发明的方法及其核心思想； 同时，对于本领域的 一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变 之处。 综上所述， 本说明书内容不应理解为对本发明的限制。
+

Claims

权 利 要 求
1、 一种 LED光源的恒流驱动器， 其特征在于， 包括主供电回路和至少一 ^^份供电回路， 所述主供电回路至少包括功率变换电路； 所述功率变换电路 输出恒定电流给 LED光源；
所述备份供电回路至少包括功率变换备份电路；所述功率变换备份电路输 出恒定电流给 LED光源；
所述功率变换电路和所述功率变换备份电路正常工作时，其中的任意一者 工作在额定状态或者降额状态， 两者的输出端并联后同时给 LED光源供电； 所述功率变换电路和所述功率变换备份电路中任意一者失效时，失效电路 不会影响剩余电路的正常工作。
2、 根据权利要求 1所述的恒流驱动器， 其特征在于， 所述功率变换备份 电路的输入端和所述功率变换电路的输入端并联。
3、 根据权利要求 1所述的恒流驱动器， 其特征在于， 所述功率变换电路 包括功率因数校正电路和恒流电路组成的串联支路，所述功率因数校正电路的 输出端连接所述恒流电路的输入端，所述恒流电路的输出端作为所述功率变换 电路的输出端连接 LED光源；
所述功率变换备份电路的输入端和所述恒流电路的输入端并联。
4、 根据权利要求 2所述的恒流驱动器， 其特征在于， 所述功率变换电路 包括功率因数校正电路和恒流电路的串联支路，所述功率因数校正电路的输出 端连接所述恒流电路的输入端，所述恒流电路的输出端作为所述功率变换电路 的输出端连接 LED光源； 或者， 所述功率变换电路为单级功率因数校正电路。
5、 根据权利要求 1、 2、 4中任意一项所述的恒流驱动器， 其特征在于， 当所述功率变换电路和所述功率变换备份电路中至多有一者为非隔离型电路 时， 所述主供电回路还包括整流电路， 所述整流电路的输出端连接所述功率变 换电路的输入端；
所述备份供电回路还包括整流备份电路，所述整流备份电路的输出端连接 所述功率变换备份电路的输入端；
所述整流备份电路和所述功率变换备份电路组成的串联支路与所述整流 电路和所述功率变换电路组成的串联支路相互并联。
6、 根据权利要求 3所述的恒流驱动器， 其特征在于， 在所述功率因数校 正电路中潜在短路危险的器件的所在支路中连接有分断器件， 当有器件短路 时， 该器件所在支路中的分断器件断开， 当所述功率因数校正电路中的器件失 效后， 所述的恒流驱动器工作在没有功率因数校正功能的不控整流状态。
7、 根据权利要求 3和 6中任意一项所述的恒流驱动器， 其特征在于， 所 述功率因数校正电路采用升压电路为主电路时，所述升压电路的输入端和输出 端之间跨接有第一二极管（D1 ), 第一二极管（D1 )的阳极接所述升压电路的 输入端， 第一二极管 （D1 ) 的阴极接所述升压电路的输出端。
8、 根据权利要求 1-7 中任意一项所述的恒流驱动器， 其特征在于， 当所 述功率变换电路和所述功率变换备份电路正常工作时，所述功率变换电路的设 定工作电流为自身额定工作电流的 100%或者 50%, 所述功率变换备份电路的 设定工作电流为自身额定工作电流的 100%或者 50%。
9、 根据权利要求 1-8 中任意一项所述的恒流驱动器， 其特征在于， 当功 率变换电路和功率变换备份电路两者中的至少一者的设定工作电流低于自身 额定工作电流时， 所述恒流驱动器还包括电流调节电路， 用于判断所述功率变 换电路和所述功率变换备份电路中有电路失效时，输出信号至剩余电路，提高 其输出电流。
10、 根据权利要求 9所述的恒流驱动器， 其特征在于， 所述电流调节电路 包括， 检测所述功率变换电路和所述功率变换备份电路输出端并联后的电流
( Io )是否下降的电流检测电路， 当所述电流检测电路的检测结果为是时， 所 述电流调节电路将工作在降额状态的功率变换电路和 /或功率变换备份电路的 输出电流提高至额定电流。
11、 根据权利要求 1至 10中任意一项所述的恒流驱动器， 其特征在于， 所述主供电回路和所述备份供电回路中串接有分离电路；当所述分离电路所在 回路正常工作时， 所述分离电路导通； 当所述分离电路所在回路发生故障时， 所述分离电路起到分离失效供电回路和剩余供电回路的作用。
12、 根据权利要求 11所述的恒流驱动器， 其特征在于， 所述分离电路包 括： 保险丝、 二极管、 半导体开关器件或继电器。
13、 根据权利要求 1至 12中任意一项所述的恒流驱动器， 其特征在于, 所述主供电回路和所述备份供电回路封装在同一盒体中。
+
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