WO2017063609A1 - 一种驱动电源回输稳定性改善电路 - Google Patents

一种驱动电源回输稳定性改善电路 Download PDF

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Publication number
WO2017063609A1
WO2017063609A1 PCT/CN2016/102289 CN2016102289W WO2017063609A1 WO 2017063609 A1 WO2017063609 A1 WO 2017063609A1 CN 2016102289 W CN2016102289 W CN 2016102289W WO 2017063609 A1 WO2017063609 A1 WO 2017063609A1
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resistor
current
circuit
voltage
input
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English (en)
French (fr)
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尤建兴
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Delight Innovative Technologies Ltd
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Delight Innovative Technologies Ltd
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Priority to US15/768,344 priority Critical patent/US10292228B2/en
Priority to EP16854984.8A priority patent/EP3364721A4/en
Publication of WO2017063609A1 publication Critical patent/WO2017063609A1/zh
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    • 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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • 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
    • H05B45/395—Linear regulators
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of driving power supply technologies, and in particular, to a driving power supply return stability improving circuit.
  • a driving power supply refers to converting a power supply (such as a high-voltage power frequency alternating current, that is, a commercial power supply, a low-voltage high-frequency alternating current such as an output of an electronic transformer, etc.) into a specific voltage and current to drive a device or a device to operate (for example, LED lighting).
  • a power supply such as a high-voltage power frequency alternating current, that is, a commercial power supply, a low-voltage high-frequency alternating current such as an output of an electronic transformer, etc.
  • a power converter that converts a power supply through a device such as a transformer to a rated power suitable for use in a lighting device or device.
  • the return circuit is generally configured in the driving power system, and the return circuit is based on the loop input (return) result (return current or return voltage) fed back by the corresponding current measuring circuit or voltage measuring circuit. Controls the functional application of the drive power supply.
  • a conventional driving power return circuit applied to the above driving power source has a structural schematic diagram as shown in FIG. 1.
  • the circuit includes a driving portion, a power supply portion, and a load portion, wherein the driving portion supplies energy to the power supply portion, and the driving portion includes power supply.
  • the control circuit may further include a power selection circuit and a logic circuit; the power part is responsible for supplying power to the load part, and the power part further includes a current measuring circuit and/or a voltage measuring circuit to provide feedback to the driving part for returning (returning current or returning voltage) .
  • the conventional driving power return circuit generally uses the corresponding comparator circuit in the current measuring circuit or the voltage measuring circuit to compare the load current (or voltage) with a preset reference current (or voltage). The direct feedback is fed back to the driving part. The structure of the return circuit is caused by the direct feedback current. When the driving power supply malfunctions abnormally, or when the power is turned on, the current jitter or current surge usually causes the circuit.
  • the detection result is deviated, which leads to errors in returning to the drive and driving energy to the power supply.
  • the drive power supply is easily damaged and a safety hazard is generated. Therefore, the conventional drive power return circuit system does not have the development requirements of the function, safety and reliability of the drive power.
  • the invention aims at the problem that the current driving power return circuit can not cope with the current jitter or current surge in the circuit due to the direct feedback current result, thereby causing the driving power source to be prone to failure and accident, and proposes a novel driving power return.
  • the stability improving circuit can realize that the current measuring circuit and/or the voltage measuring circuit give the driving back feedback to control the driving output function, and the resistor and the storage capacitor can be generated by configuring the current limiting resistor and the residual current voltage difference.
  • a driving power return stability improving circuit includes a reference resistor, a current measuring resistor, a comparator, a logic circuit, a driving circuit and a load, one end of the reference resistor is connected to the input power source, and the other end of the reference resistor is compared with the comparison One input end of the device is connected, one end of the current measuring resistor is connected to the input power source, and the other end of the current measuring resistor is simultaneously connected to the other input end of the comparator and the output end of the load, the input end of the load Connecting with the output end of the driving circuit, further comprising a control circuit, a current limiting resistor, a storage capacitor and a residual current differential voltage generating resistor, wherein an output end of the comparator is connected to one end of the current limiting resistor The other end of the current limiting resistor is simultaneously connected to one end of the residual current differential pressure generating resistor and an input end of the logic circuit, and a return voltage is drawn between the current limiting resistor and the residual current differential pressure generating resistor
  • a constant current source is further included, and the other end of the reference resistor is connected to the constant current source.
  • control circuit has at least four inputs, a first input of the control circuit inputs a control voltage signal, and a second input of the control circuit is coupled to an output of the logic circuit.
  • the third input end of the control circuit is connected to one end of the configuration resistor, the fourth input end of the control circuit is connected to the other end of the reference resistor, and the other end of the configuration resistor is grounded.
  • the control circuit also has a fifth input, and the fifth input of the control circuit inputs a dimming voltage signal.
  • the residual current differential pressure produces a resistance value that maintains a return voltage range of -10 mV to +10 mV.
  • the configuration resistor takes a value that maintains its partial voltage at 1V.
  • the reference resistor takes a value that maintains its partial pressure at 200 mV.
  • the logic circuit is an inverter.
  • the control voltage in the control voltage signal ranges from 0-10V.
  • the dimming voltage in the dimming voltage signal ranges from 0-10V.
  • the invention provides a driving power return stability improving circuit, comprising a reference resistor, a current measuring resistor, a comparator, a logic circuit, a driving circuit and a load, and further comprises a control circuit, a current limiting resistor, a residual current differential pressure generating resistor and The storage capacitor, one end of the reference resistor and one end of the current-sense resistor are connected to the input power source, and the other end of the reference resistor and the other end of the current-sense resistor are connected to the input end of the comparator, and the output of the comparator and the current limiting resistor are connected.
  • One end is connected, and the other end of the current limiting resistor is connected to one end of the residual current differential voltage generating resistor and the input end of the logic circuit, and the current limiting resistor and the residual current voltage difference generate a return voltage between the resistors to the logic circuit, and the residual current voltage
  • the other end of the difference generating resistor is connected to one end of the storage capacitor, and the other end of the storage capacitor is grounded.
  • the circuit no longer directly uses the comparator to detect the load current and a certain reference current. The comparison result is fed back to the drive circuit.
  • the current limiting resistor and the residual current differential pressure are generated to generate the resistor and the storage capacitor for current limiting and stable finishing, thereby providing a stable voltage and current.
  • the current limiting resistor and the residual current voltage difference generate a return voltage between the resistors, which can greatly reduce the current jitter and suppress the current surge.
  • the control circuit accurately determines the driving power current state according to the result of the stable return voltage to drive the circuit. Driving the load, thereby reducing circuit safety hazards, adapting to the development requirements of the driver power integration functionality, safety, and reliability, improving the service life of the driving power device and reducing the cost of the driving power system.
  • the driving power supply return stability improving circuit proposed by the invention can set a constant current source to further improve the stability performance of the return voltage.
  • a control circuit having multiple input terminals is provided, and the control circuit determines the current state of the LED driving power source according to the level of the output level of the comparator, and the control circuit generates and adjusts the reference voltage obtained by each input terminal, the LED driving power source current state, and the control voltage signal.
  • the current drives the signal so that the drive circuit drives the load, thereby further improving the stability of the entire return circuit.
  • this preferred scheme no longer uses a constant current source to provide a constant voltage, thereby avoiding the constant current source due to different types of different devices.
  • the parameters are different, which leads to voltage fluctuations, the accuracy is unstable, and can not be applied to different load requirements.
  • the comparator is also used to monitor the driving power supply current to achieve accurate current feedback function; Combined with the control voltage for different applications and the dimming voltage range of different illumination requirements, it can be applied to different loads, improving the reliability and versatility of the whole circuit, and avoiding repeated design of different application requirements. open The problem, reducing design cycle time and cost.
  • FIG. 1 is a schematic structural diagram of a conventional driving power supply return circuit.
  • FIG. 2 is a first preferred structural diagram of a driving power supply return stability improving circuit of the present invention.
  • FIG. 3 is a second preferred structural diagram of a driving power supply return stability improving circuit of the present invention.
  • the invention relates to a driving power supply return stability improving circuit.
  • the preferred circuit structure diagram is shown in FIG. 2, including a reference resistor R 1 , a current measuring resistor R 2 , a comparator, a logic circuit, a control circuit, a driving circuit and a load. further comprising a current limiting resistor R 3, the pressure differential residual current generating resistor R 4 and the storage capacitor C 1, the preferred embodiment further comprises a constant current source.
  • one end of the reference resistor R 1 is connected to the input power source V in , and the other end of the reference resistor R 1 is simultaneously connected to an input end of the comparator (for example, the non-inverting input terminal) and a constant current source, and one end of the current measuring resistor R 2 and the input
  • the power supply V in is connected, and the other end of the current measuring resistor R 2 is simultaneously connected to the other input end of the comparator (for example, the inverting input end) and the output end of the load, and the input end of the load is connected to the output end of the drive, and the input end of the drive connected to the output of the control circuit, and the output of the input logic circuit is connected to a control circuit
  • the output of the comparator and the current limiting resistor R 3 is connected to one end
  • the other end of the current limiting resistor R 3 is connected to a residual current while pressure
  • An end of the resistor R 4 is generated and an input end of the logic circuit, and a return voltage is drawn between the current
  • the circuit no longer directly uses the comparator to detect the comparison result of the load current and a certain reference current to the drive control circuit, but generates the resistor R 4 and the storage capacitor C 1 by selecting the current limiting resistor R 3 and the residual current voltage difference.
  • the return voltage is drawn between the current limiting resistor R 3 and the residual current differential voltage generating resistor R 4 , and the comparator is used to monitor the driving power source current to achieve accurate current feedback function; at the same time, the current limiting resistor R 3 and the residual current voltage are selected.
  • the circuit structure and the reasonable configuration of the resistor R 4 and the storage capacitor C 1 realize the current limiting function of the circuit, avoiding the safety hazard caused by the large current jitter and surge on the circuit, and improving the safety of the circuit work. Sex, stability and reliability.
  • the residual current differential pressure generating resistor R 4 may be selected to maintain a return voltage (such as the input voltage of the logic circuit shown in FIG. 2 ) ranging from -10 mV to +10 mV; the value of the reference resistor R 1 It may be chosen to maintain its partial voltage at 200 mV; in addition, the logic circuit may be an inverter or a combinational logic circuit of one or more inverters, AND gates, OR gates, and/or other such logic gates.
  • the reference resistor R 1 and the current measuring resistor R 2 convert the reference current and the detection current from the current into a voltage. Specifically, the reference current is converted into a reference voltage through the reference resistor R 1 , and the current measuring resistor R is passed. 2
  • the current measurement voltage also referred to as the detection voltage
  • the comparator compares the magnitudes of the two voltage values (ie, the reference voltage and the current measurement voltage) to determine the detection current (ie, corresponds to the current measurement voltage). Whether it is higher than the reference current (that is, equivalent to the reference voltage), that is, whether the detected current is within a reasonable safe value range with respect to the reference current.
  • the two inputs of the comparator the non-inverting input connected to the current-sense resistor R 2 (generally labeled "+” terminal) and the inverting input connected to the reference resistor R 1 (generally identified as "-" terminal), when the input voltage of the non-inverting input terminal > input voltage of the inverting input terminal, the comparator outputs a high level; when the input voltage of the non-inverting input terminal ⁇ the input voltage of the inverting input terminal, the comparator outputs a low level.
  • the current state of the driving power source can be determined, that is, whether the detection current (that is, the current measuring voltage) is higher than the reference current (that is, equivalent to the reference voltage), that is, relative to the reference current. Check if the current is within a reasonable safe value range. Further, the output level of the comparator is stabilized by the current limiting resistor R 3 , the residual current differential voltage generating resistor R 4 and the storage capacitor C 1 , and then the voltage is returned (the logic circuit shown in FIG. 2).
  • V V floating reinfusion + I cntl * R 4 (wherein, V is a float on a floating voltage generating energy storage capacitor C; I cntl flowing through the current limiting resistor R 3 and the pressure differential residual current
  • the current on the resistor R 4 is generated, that is, the difference current output from the comparator.
  • the floating voltage generated on the storage capacitor C 1 gradually rises and gradually approaches a certain target value ( When asymptotically fails to reach), the residual current differential pressure generating resistor R 4 generates a residual current differential voltage according to the differential current output from the comparator, thereby compensating to a certain target value (ie, adding to the return voltage V).
  • the driving power supply return stability improving circuit proposed by the present invention uses a constant current source to provide a constant current voltage difference.
  • the value of the reference resistor R 1 can be selected to maintain a partial voltage of 200 mV;
  • the flow voltage difference can be customized according to different reference current requirements.
  • the driving power supply return stability improving circuit of the embodiment includes a reference resistor R 1 , a current measuring resistor R 2 , a comparator, and a logic circuit.
  • the driving circuit and the load further include a control circuit, a current limiting resistor R 3 , a residual current differential pressure generating resistor R 4 , a configuration resistor R 5 and a storage capacitor C 1 .
  • the control circuit of this embodiment has five inputs and one An output terminal, wherein one end of the reference resistor R 1 is connected to the input power source V in , and the other end of the reference resistor R 1 is simultaneously connected to an input end of the comparator (for example, the non-inverting input terminal) and the fourth input end of the control circuit, and the current is measured
  • One end of the resistor R 2 is connected to the input power source V in , and the other end of the current measuring resistor R 2 is simultaneously connected to the other input end of the comparator (for example, the inverting input terminal) and the output end of the load, the input end of the load and the driving circuit an output terminal connected to an input terminal and an output terminal of the control circuit is connected to a drive circuit, a control circuit, a first control voltage signal input terminal (or is connected to a control voltage V c), the control circuit Fifth input voltage input dimming signal (or is connected to a dimming voltage V d), the output terminal of the second input terminal of the logic circuit of the control circuit
  • the circuit no longer directly uses the comparator to detect the comparison result of the load current and a certain reference current to the drive control circuit, but generates the resistor R 4 and the storage capacitor C 1 by selecting the current limiting resistor R 3 and the residual current voltage difference.
  • the comparator is also used to monitor the driving power supply current to achieve accurate current feedback feedback function.
  • the circuit structure of the current limiting resistor R 3 , the residual current voltage difference generating resistor R 4 and the storage capacitor C 1 and the reasonable configuration are realized to realize the circuit.
  • the current limiting function avoids the safety hazard caused by large current jitter and surge on the circuit, and improves the safety, stability and reliability of the circuit operation.
  • the circuit no longer uses a constant current source to provide a constant voltage, but instead selects a configuration resistor R 5 and a multi-input control circuit, combined with a control voltage V c for different applications and dimming for different illumination requirements.
  • the voltage V d range enables the current measuring circuit to be applied to different load requirements, and the versatility of the current measuring circuit is improved, and the design cycle and cost are reduced.
  • the residual current differential pressure generating resistor R 4 may be selected to maintain a return voltage (such as the input voltage of the logic circuit shown in FIG. 3 ) ranging from -10 mV to +10 mV; the control voltage in the control voltage signal The range of V c may be 0-10V; the dimming voltage V d in the dimming voltage signal may range from 0-10V; the value of the configuration resistor R 5 may be selected to maintain its divided voltage to 1V; the reference resistor R 1 The value can be chosen to maintain its partial voltage of 200mV; in addition, the logic circuit can be an inverter, or a combination of one or more inverters, AND gates, OR gates and/or other such logic gates. Logic circuit.
  • the reference resistor R 1 and the current measuring resistor R 2 convert the reference current and the detection current from the current into a voltage. Specifically, the reference current is converted into a reference voltage through the reference resistor R 1 , and the current measuring resistor R is passed. 2
  • the current measurement voltage also referred to as the detection voltage
  • the comparator compares the magnitudes of the two voltage values (ie, the reference voltage and the current measurement voltage) to determine the detection current (ie, corresponds to the current measurement voltage). Whether it is higher than the reference current (that is, equivalent to the reference voltage), that is, whether the detected current is within a reasonable safe value range with respect to the reference current.
  • the two inputs of the comparator the non-inverting input connected to the current-sense resistor R 2 (generally labeled “+”) and the inverting input connected to the reference resistor R 1 (generally identified as "-" terminal), when the input voltage of the non-inverting input terminal > input voltage of the inverting input terminal, the comparator outputs a high level; when the input voltage of the non-inverting input terminal ⁇ the input voltage of the inverting input terminal, the comparator outputs a low level.
  • the current state of the driving power source can be determined, that is, whether the detection current (that is, the current measuring voltage) is higher than the reference current (that is, equivalent to the reference voltage), that is, relative to the reference current. Check if the current is within a reasonable safe value range. Further, the output level of the comparator is stabilized by the current limiting resistor R 3 , the residual current differential voltage generating resistor R 4 and the storage capacitor C 1 , and then the voltage is returned (such as the logic circuit shown in FIG. 3 ).
  • V V floating reinfusion + I cntl * R 4 (wherein, V is a float on a floating voltage generating energy storage capacitor C; I cntl flowing through the current limiting resistor R 3 and the pressure differential residual current
  • the current on the resistor R 4 is generated, that is, the difference current output from the comparator.
  • the floating voltage generated on the storage capacitor C 1 gradually rises and gradually approaches a certain target value ( When asymptotically fails to reach), the residual current differential pressure generating resistor R 4 generates a residual current differential voltage according to the differential current output from the comparator, thereby compensating to a certain target value (ie, adding to the return voltage V).
  • the control circuit obtains the reference voltage obtained according to the fourth input terminal and the LED driving power source current state obtained by the second input terminal combined with the first input Control voltage signal Dimming voltage signal generating a current drive signal to adjust the fifth input, that is, the control circuit (i.e., increasing or decreasing the driving current) controls the driving circuit to drive a load based on the data obtained adjustments for each input.
  • the driving power supply current measuring circuit proposed by the present invention does not use a constant current source to provide a constant current voltage difference, but achieves a stable constant current voltage difference by configuring the resistor R 5 and the matched control circuit, for example, configuration.
  • the value of the resistor R 5 can be selected to maintain its divided voltage to 1V; the value of the reference resistor R 1 can be selected to maintain its partial voltage of 200mV; the constant current voltage difference can be customized according to different reference current requirements.
  • the present invention can meet different flow feedback requirements through its multi-input control circuit when different driving power sources operate or the driving power source operates in different lighting illumination (eg, LED lighting) requirements.
  • the control range of supply voltage V c can be adjusted within the range 0-10V; when the illumination device or the light emitting device operating at different illumination light emission occasion demands, the dimmer voltage V d is The range can be adjusted within the range of 0-10V; the above voltage range can be customized according to different application requirements.

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Abstract

一种驱动电源回输稳定性改善电路，包括参考电阻R1、测流电阻R2、比较器、逻辑电路、驱动电路和负载，还包括控制电路、限流电阻R3、储能电容C1和残余电流压差产生电阻R4，比较器的输出端与所述限流电阻R3的一端连接，限流电阻R3的另一端同时连接所述残余电流压差产生电阻R4的一端以及逻辑电路的输入端，在限流电阻R3和残余电流压差产生电阻R4之间引出回输电压至逻辑电路，残余电流压差产生电阻R4的另一端与储能电容C1的一端连接。上述电路结构较大程度地降低了电流抖动、抑制了电流浪涌，提高了电路安全性和可靠性。

Description

一种驱动电源回输稳定性改善电路 技术领域
本发明涉及驱动电源技术领域，尤其涉及一种驱动电源回输稳定性改善电路。
背景技术
驱动电源(例如LED驱动电源)是指将电源供应(例如高压工频交流即市电，低压高频交流如电子变压器的输出等)转换为特定的电压电流以驱动设备或器件工作(例如LED发光照明)的电源转换器，也即是说，将电源供应通过诸如变压器等器件转换为适用于照明设备或器件工作的额定功率。为了保证驱动电源的安全使用，一般在驱动电源系统中配置回输电路，回输电路根据相应的测流电路或测压电路反馈的回路输入(回输)结果(回输电流或回输电压)控制驱动电源的功能应用。应用于上述驱动电源的传统的驱动电源回输电路，其结构示意图如图1所示，该电路包括驱动部分、电源部分以及负载部分，其中，驱动部分给予电源部分提供能量，驱动部分包括供能控制电路，还可以包括功率选择电路和逻辑电路；电源部分负责给予负载部分供电，电源部分还包括测流电路和/或测压电路给予驱动部分提供回输(回输电流或回输电压)反馈。传统的驱动电源回输电路，一般在直流部分直接利用测流电路或测压电路中相应的比较器电路比较负载电流(或电压)与预先设置的某一参考电流(或电压)得到的结果，直接回输反馈给驱动部分，这种回输电路的结构由于直接反馈电流结果，当驱动电源非正常工作发生故障时，或上电启动时，产生的电流抖动或电流浪涌，通常会造成电路检测结果出现偏差，进而导致回输给驱动以及驱动能量给电源时发生失误，更甚者，当产生的电流抖动或电流浪涌峰值比较大时，极易造成驱动电源的损坏，产生安全隐患，因此，传统的驱动电源回输电路系统不具备驱动电源功能性、安全性、可靠性的发展要求。
发明内容
本发明针对现有的驱动电源回输电路由于直接反馈电流结果，无法应对电路中电流抖动或电流浪涌，进而导致驱动电源容易发生故障和事故的问题，提出了一种新颖的驱动电源回输稳定性改善电路，能够实现测流电路和/或测压电路给予驱动提供回输反馈以控制驱动输出功能的同时，通过配置限流电阻、残余电流压差产生电阻和储能电容，能够较大程度地降低电流抖动、抑制电流浪涌，降低电路安全隐患，适应驱动电源集成功能性、安全性、可靠性的发展要求，提高了驱动电源器件的使用寿命，降低了驱动电源系统成本。
本发明的技术方案如下：
一种驱动电源回输稳定性改善电路，包括参考电阻、测流电阻、比较器、逻辑电路、驱动电路和负载，所述参考电阻的一端与输入电源连接，参考电阻的另一端与所述比较器的一输入端连接，所述测流电阻的一端与输入电源连接，测流电阻的另一端同时连接所述比较器的另一输入端以及所述负载的输出端，所述负载的输入端与所述驱动电路的输出端连接，其特征在于，还包括控制电路、限流电阻、储能电容和残余电流压差产生电阻，所述比较器的输出端与所述限流电阻的一端连接，所述限流电阻的另一端同时连接所述残余电流压差产生电阻的一端以及所述逻辑电路的输入端，在所述限流电阻和残余电流压差产生电阻之间引出回输电压至逻辑电路，所述残余电流压差产生电阻的另一端与所述储能电容的一端连接，所述储能电容的另一端接地，所述驱动电路的输入端与所述控制电路的输出端连接，所述控制电路的输入端与所述逻辑电路的输出端连接。
还包括恒流源，所述参考电阻的另一端与所述恒流源连接。
还包括配置电阻，所述控制电路至少具有四个输入端，所述控制电路的第一输入端输入控制电压信号，所述控制电路的第二输入端与所述逻辑电路的输出端连接，所述控制电路的第三输入端与所述配置电阻的一端连接，所述控制电路的第四输入端与所述参考电阻的另一端连接，所述配置电阻的另一端接地。
所述控制电路还具有第五输入端，所述控制电路的第五输入端输入调光电压信号。
所述残余电流压差产生电阻取值保持回输电压范围为-10mV～+10mV。
所述配置电阻取值保持其分压为1V。
所述参考电阻取值保持其分压为200mV。
所述逻辑电路为一反相器。
所述控制电压信号中的控制电压范围为0-10V。
所述调光电压信号中的调光电压范围为0-10V。
本发明的技术效果如下：
本发明提出了一种驱动电源回输稳定性改善电路，包括参考电阻、测流电阻、比较器、逻辑电路、驱动电路和负载，还包括控制电路、限流电阻、残余电流压差产生电阻和储能电容，参考电阻的一端和测流电阻的一端均与输入电源连接，参考电阻的另一端和测流电阻的另一端均与比较器的输入端连接，比较器的输出端与限流电阻的一端连接，限流电阻的另一端同时连接残余电流压差产生电阻的一端以及逻辑电路的输入端，限流电阻和残余电流压差产生电阻之间引出回输电压至逻辑电路，残余电流压差产生电阻的另一端与储能电容的一端连接，储能电容的另一端接地。该电路不再直接利用比较器检测负载电流与某一参考电流的 比较结果回输反馈给驱动电路，通过各部件的特定连接及其相互配合工作，配置限流电阻、残余电流压差产生电阻和储能电容进行限流稳定整理，进而提供稳定的电压电流，在限流电阻和残余电流压差产生电阻之间引出回输电压，能够较大程度地降低电流抖动、抑制电流浪涌，控制电路根据稳定的回输电压的结果精确判断驱动电源电流状态以便驱动电路驱动负载，从而降低电路安全隐患，适应驱动电源集成功能性、安全性、可靠性的发展要求，提高了驱动电源器件的使用寿命，降低了驱动电源系统成本。
本发明提出的驱动电源回输稳定性改善电路，可设置恒流源，进一步改善回输电压的稳定性能。又或者设置具有多输入端的控制电路，控制电路根据比较器输出电平的高低判断LED驱动电源电流状态，控制电路通过自身各输入端得到的参考电压、LED驱动电源电流状态以及控制电压信号生成调整电流驱动信号，以便驱动电路驱动负载，从而进一步改善整个回输电路的稳定性能，而且，这种优选方案不再使用恒流源以提供恒定电压，避免了恒流源由于不同型号不同器件导致的参数不同，进而导致电压波动，精度不稳定，并且不能应用于不同负载要求的问题，通过选取配置电阻以及配合多输入的控制电路，同样利用比较器监控驱动电源电流以实现准确测流反馈功能；结合适应于不同应用场合的控制电压和不同照明发光需求的调光电压范围，实现了可以应用于不同的负载的同时，提高了整个电路的可靠性和通用性，并且避免了不同应用需求重复设计开发的问题，降低了设计周期和成本。
附图说明
图1为传统的驱动电源回输电路结构示意图。
图2为本发明的驱动电源回输稳定性改善电路第一种优选结构示意图。
图3为本发明的驱动电源回输稳定性改善电路第二种优选结构示意图。
具体实施方式
下面结合附图对本发明进行说明。
本发明涉及一种驱动电源回输稳定性改善电路，其优选电路结构示意图如图2所示，包括参考电阻R1、测流电阻R2、比较器、逻辑电路、控制电路、驱动电路和负载，还包括限流电阻R3、残余电流压差产生电阻R4和储能电容C1，该实施例还优选包括恒流源。其中，参考电阻R1的一端与输入电源Vin连接，参考电阻R1的另一端同时连接比较器的一输入端(例如同相输入端)以及恒流源，测流电阻R2的一端与输入电源Vin连接，测流电阻R2的另一端同时连接比较器的另一输入端(例如反相输入端)以及负载的输出端，负载的输入端与驱动的输出端连接，驱动的输入端与控制电路的输出端连接，控制电路的输入端与逻辑电路的输 出端连接，比较器的输出端与限流电阻R3的一端连接，限流电阻R3的另一端同时连接残余电流压差产生电阻R4的一端以及逻辑电路的输入端，在限流电阻R3和残余电流压差产生电阻R4之间引出回输电压至逻辑电路，残余电流压差产生电阻R4的另一端与储能电容C1的一端连接，储能电容C1的另一端接地。该电路不再直接利用比较器检测负载电流与某一参考电流的比较结果反馈给驱动控制电路，而是通过选取限流电阻R3、残余电流压差产生电阻R4和储能电容C1，在限流电阻R3和残余电流压差产生电阻R4之间引出回输电压，同样利用比较器监控驱动电源电流以实现准确测流反馈功能；同时，选取限流电阻R3、残余电流压差产生电阻R4和储能电容C1的电路结构以及合理配置，实现了电路的限流稳定功能，避免了较大的电流抖动和浪涌对电路造成的安全隐患，提高了电路工作的安全性、稳定性和可靠性。
优选地，上述残余电流压差产生电阻R4取值可以选取为保持回输电压(如图2中所示的逻辑电路的输入电压)范围为-10mV～+10mV；参考电阻R1的取值可以选取为保持其分压为200mV；此外，逻辑电路可以为一反相器，也可以为一个或多个反相器、与门、或门和/或其它诸如此类的逻辑门的组合逻辑电路。
本发明涉及的图2中所示的电路的工作原理说明如下：
当驱动电源正常工作时，参考电阻R1和测流电阻R2将参考电流和检测电流由电流转换为电压，具体为，通过参考电阻R1将参考电流转换为参考电压，通过测流电阻R2将检测电流转换的测流电压(也可称为检测电压)，进而通过比较器比较上述两个电压值(即参考电压和测流电压)大小，判断出检测电流(即相当于测流电压)是否高于参考电流(即相当于参考电压)，即相对于参考电流而言，检测电流是否在合理的安全值范围内。如图2所示，例如，比较器的两个输入端：测流电阻R2连接的同相输入端(一般标识为“+”端)及参考电阻R1连接的反相输入端(一般标识为“-”端)，当同相输入端输入电压>反相输入端输入电压时，比较器输出高电平；当同相输入端输入电压<反相输入端输入电压时，比较器输出低电平。根据比较器输出电平的高低便可判断此时驱动电源电流状态，即检测电流(即相当于测流电压)是否高于参考电流(即相当于参考电压)，即相对于参考电流而言，检测电流是否在合理的安全值范围内。进而比较器的输出电平利用限流电阻R3、残余电流压差产生电阻R4和储能电容C1进行限流稳定整理后，此时回输电压(如图2中所示的逻辑电路的输入电压)值为V回 输＝V漂浮+Icntl*R4(其中，V漂浮为储能电容C1上产生的漂浮电压；Icntl为流经限流电阻R3和残余电流压差产生电阻R4上的电流，也即是比较器输出的差值电流)，当电路正常工作时，此时储能电容C1上产生的漂浮电压逐渐上升，并逐渐接近至某一目标值(渐近而未能到达)时，此时残余电流压差产生电阻R4根据比较器输出的差值电流产生残余电流压差，进而补偿至上述的某一目标值(即添加至回输电压V回输进行反馈控制)，然后依次通过逻辑电路整理逻辑 电平，再由控制电路根据接收到的LED驱动电源电流状态生成调整电流驱动信号，也就是说，控制电路调整(即增加或减少驱动电流)控制驱动电路以驱动负载。如图2所示，本发明提出的驱动电源回输稳定性改善电路使用恒流源以提供定流电压差，例如，参考电阻R1的取值可以选取为保持其分压为200mV；该定流电压差可以根据不同的参考电流需求自定义设置。
图3为本发明的驱动电源回输稳定性改善电路第二种优选结构示意图，该实施例的驱动电源回输稳定性改善电路包括参考电阻R1、测流电阻R2、比较器、逻辑电路、驱动电路和负载，还包括控制电路、限流电阻R3、残余电流压差产生电阻R4、配置电阻R5和储能电容C1，该实施例的控制电路具有五个输入端和一个输出端，其中，参考电阻R1的一端与输入电源Vin连接，参考电阻R1的另一端同时连接比较器的一输入端(例如同相输入端)以及控制电路的第四输入端，测流电阻R2的一端与输入电源Vin连接，测流电阻R2的另一端同时连接比较器的另一输入端(例如反相输入端)以及负载的输出端，负载的输入端与驱动电路的输出端连接，驱动电路的输入端与控制电路的输出端连接，控制电路的第一输入端输入控制电压信号(或者说是连接控制电压Vc)，控制电路的第五输入端输入调光电压信号(或者说是连接调光电压Vd)，控制电路的第二输入端与逻辑电路的输出端连接，控制电路的第三输入端接入具有配置电阻R5的支路，具体为控制电路的第三输入端与配置电阻R5的一端连接，配置电阻R5的另一端接地，比较器的输出端与限流电阻R3的一端连接，限流电阻R3的另一端同时连接残余电流压差产生电阻R4的一端以及逻辑电路的输入端，在限流电阻R3和残余电流压差产生电阻R4之间引出回输电压至逻辑电路，残余电流压差产生电阻R4的另一端与储能电容C1的一端连接，储能电容C1的另一端接地。该电路不再直接利用比较器检测负载电流与某一参考电流的比较结果反馈给驱动控制电路，而是通过选取限流电阻R3、残余电流压差产生电阻R4和储能电容C1，同样利用比较器监控驱动电源电流以实现准确测流反馈功能；同时，选取限流电阻R3、残余电流压差产生电阻R4和储能电容C1的电路结构以及合理配置，实现了电路的限流稳定功能，避免了较大的电流抖动和浪涌对电路造成的安全隐患，提高了电路工作的安全性、稳定性和可靠性。此外，该电路不再使用恒流源以提供恒定电压，而是通过选取配置电阻R5以及配合多输入的控制电路，结合适应于不同应用场合的控制电压Vc和不同照明发光需求的调光电压Vd范围，实现了该测流电路可以应用于不同的负载要求，并且提高了测流电路的通用性，降低了设计周期和成本。
优选地，上述残余电流压差产生电阻R4取值可以选取为保持回输电压(如图3中所示的逻辑电路的输入电压)范围为-10mV～+10mV；控制电压信号中的控制电压Vc的范围可以为0-10V；调光电压信号中的调光电压Vd的范围可以为0-10V；配置电阻R5的取值可以选取为保持其分压为1V；参考电阻R1的取值可以选取为保持其分压为200mV；此外，逻辑电路可 以为一反相器，也可以为一个或多个反相器、与门、或门和/或其它诸如此类的逻辑门的组合逻辑电路。
本发明涉及的图3中所示的电路的工作原理说明如下：
当驱动电源正常工作时，参考电阻R1和测流电阻R2将参考电流和检测电流由电流转换为电压，具体为，通过参考电阻R1将参考电流转换为参考电压，通过测流电阻R2将检测电流转换的测流电压(也可称为检测电压)，进而通过比较器比较上述两个电压值(即参考电压和测流电压)大小，判断出检测电流(即相当于测流电压)是否高于参考电流(即相当于参考电压)，即相对于参考电流而言，检测电流是否在合理的安全值范围内。如图3所示，例如，比较器的两个输入端：测流电阻R2连接的同相输入端(一般标识为“+”端)及参考电阻R1连接的反相输入端(一般标识为“-”端)，当同相输入端输入电压>反相输入端输入电压时，比较器输出高电平；当同相输入端输入电压<反相输入端输入电压时，比较器输出低电平。根据比较器输出电平的高低便可判断此时驱动电源电流状态，即检测电流(即相当于测流电压)是否高于参考电流(即相当于参考电压)，即相对于参考电流而言，检测电流是否在合理的安全值范围内。进而比较器的输出电平利用限流电阻R3、残余电流压差产生电阻R4和储能电容C1进行限流稳定整理后，此时回输电压(如图3中所示的逻辑电路的输入电压)值为V回 输＝V漂浮+Icntl*R4(其中，V漂浮为储能电容C1上产生的漂浮电压；Icntl为流经限流电阻R3和残余电流压差产生电阻R4上的电流，也即是比较器输出的差值电流)，当电路正常工作时，此时储能电容C1上产生的漂浮电压逐渐上升，并逐渐接近至某一目标值(渐近而未能到达)时，此时残余电流压差产生电阻R4根据比较器输出的差值电流产生残余电流压差，进而补偿至上述的某一目标值(即添加至回输电压V回输进行反馈控制)，然后依次通过逻辑电路整理逻辑电平后输入至控制电路，控制电路根据第四输入端得到的参考电压以及第二输入端得到的LED驱动电源电流状态并结合第一输入端的控制电压信号和第五输入端的调光电压信号生成调整电流驱动信号，也就是说，控制电路根据各输入端得到的数据调整(即增加或减少驱动电流)控制驱动电路以驱动负载。如图3所示，本发明提出的驱动电源测流电路不使用恒流源以提供定流电压差，而是通过配置电阻R5以及配合的控制电路实现稳定的定流电压差，例如，配置电阻R5的取值可以选取为保持其分压为1V；参考电阻R1的取值可以选取为保持其分压为200mV；该定流电压差可以根据不同的参考电流需求自定义设置。此外，当不同的驱动电源工作或驱动电源工作在不同的照明发光(例如LED照明发光)需求场合时，本发明可以通过其多输入的控制电路满足不同的测流反馈要求。例如，当驱动不同型号的照明发光设备或器件时，控制电压Vc的范围可以在0-10V范围内调整；当照明发光设备或器件工作在不同的照明发光需求场合时，调光电压Vd的范围可以在0-10V范围内调整；上述电压取值范围 可以根据不同的应用需求自定义设置。
应当指出，以上所述具体实施方式可以使本领域的技术人员更全面地理解本发明创造，但不以任何方式限制本发明创造。因此，尽管本说明书参照附图和实施例对本发明创造已进行了详细的说明，但是，本领域技术人员应当理解，仍然可以对本发明创造进行修改或者等同替换，总之，一切不脱离本发明创造的精神和范围的技术方案及其改进，其均应涵盖在本发明创造专利的保护范围当中。

Claims (10)

  1. 一种驱动电源回输稳定性改善电路，包括参考电阻、测流电阻、比较器、逻辑电路、驱动电路和负载，所述参考电阻的一端与输入电源连接，参考电阻的另一端与所述比较器的一输入端连接，所述测流电阻的一端与输入电源连接，测流电阻的另一端同时连接所述比较器的另一输入端以及所述负载的输出端，所述负载的输入端与所述驱动电路的输出端连接，其特征在于，还包括控制电路、限流电阻、储能电容和残余电流压差产生电阻，所述比较器的输出端与所述限流电阻的一端连接，所述限流电阻的另一端同时连接所述残余电流压差产生电阻的一端以及所述逻辑电路的输入端，在所述限流电阻和残余电流压差产生电阻之间引出回输电压至逻辑电路，所述残余电流压差产生电阻的另一端与所述储能电容的一端连接，所述储能电容的另一端接地，所述驱动电路的输入端与所述控制电路的输出端连接，所述控制电路的输入端与所述逻辑电路的输出端连接。
  2. 根据权利要求1所述的驱动电源回输稳定性改善电路，其特征在于，还包括恒流源，所述参考电阻的另一端与所述恒流源连接。
  3. 根据权利要求1所述的驱动电源回输稳定性改善电路，其特征在于，还包括配置电阻，所述控制电路至少具有四个输入端，所述控制电路的第一输入端输入控制电压信号，所述控制电路的第二输入端与所述逻辑电路的输出端连接，所述控制电路的第三输入端与所述配置电阻的一端连接，所述控制电路的第四输入端与所述参考电阻的另一端连接，所述配置电阻的另一端接地。
  4. 根据权利要求3所述的驱动电源回输稳定性改善电路，其特征在于，所述控制电路还具有第五输入端，所述控制电路的第五输入端输入调光电压信号。
  5. 根据权利要求1至4之一所述的驱动电源回输稳定性改善电路，其特征在于，所述残余电流压差产生电阻取值保持回输电压范围为-10mV～+10mV。
  6. 根据权利要求3所述的驱动电源回输稳定性改善电路，其特征在于，所述配置电阻取值保持其分压为1V。
  7. 根据权利要求1所述的驱动电源回输稳定性改善电路，其特征在于，所述参考电阻取值保持其分压为200mV。
  8. 根据权利要求1所述的驱动电源回输稳定性改善电路，其特征在于，所述逻辑电路为一反相器。
  9. 根据权利要求3所述的驱动电源回输稳定性改善电路，其特征在于，所述控制电压信号中的控制电压范围为0-10V。
  10. 根据权利要求4所述的驱动电源回输稳定性改善电路，其特征在于，所述调光电压信号中的调光电压范围为0-10V。
PCT/CN2016/102289 2015-10-16 2016-10-17 一种驱动电源回输稳定性改善电路 Ceased WO2017063609A1 (zh)

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