CN102694471A - Auxiliary power supply system for photovoltaic inverter - Google Patents

Auxiliary power supply system for photovoltaic inverter Download PDF

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CN102694471A
CN102694471A CN 201210166951 CN201210166951A CN102694471A CN 102694471 A CN102694471 A CN 102694471A CN 201210166951 CN201210166951 CN 201210166951 CN 201210166951 A CN201210166951 A CN 201210166951A CN 102694471 A CN102694471 A CN 102694471A
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unit
control
power
circuit
supply
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CN 201210166951
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CN102694471B (en )
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孟婥
彭乐乐
徐洋
易振华
钟倩文
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上海盟津光电科技有限公司
东华大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects

Abstract

The invention provides an auxiliary power supply system for a photovoltaic inverter. The auxiliary power supply system for the photovoltaic inverter is characterized by comprising a starting circuit unit, wherein the input end of the starting circuit unit is connected with a direct-current (DC) generatrix voltage of an inverter; the DC generatrix voltage of the inverter is also connected with a power supply conversion circuit; the output end of the starting circuit unit is connected with a current-limiting delay trigger circuit unit; the enabling end of a power supply control unit is connected with a control unit; the control unit enables the power supply control unit according to a second voltage control signal generated by a back-end detection and protection circuit unit; the power supply control unit is connected with a bootstrap circuit unit; and after the power supply control unit can generate a stable DC voltage, the bootstrap circuit unit works under the control of a first voltage control signal generated by the back-end detection and protection circuit unit. The auxiliary power supply system for the photovoltaic inverter has the advantages that a dual closed-loop feedback control system is adopted, so that a stable output voltage of an auxiliary power supply is ensured; and control signals are combined with a controller reset circuit logically, so that the stable operation of control is ensured.

Description

光伏逆变器辅助电源系统 PV inverter auxiliary power supply system

技术领域 FIELD

[0001] 本发明涉及一种光伏逆变器辅助电源系统,属于太阳能光伏发电技术领域。 [0001] The present invention relates to a photovoltaic inverter auxiliary power supply system, it belongs to the technical field of solar photovoltaic power generation. 背景技术 Background technique

[0002] 光伏逆变器的辅助电源与常用开关电源相比有很大不同。 [0002] Auxiliary power PV inverter switching power supply compared to commonly used are very different. 通常,普通开关电源用电是电网的交流电经过变压、整流后,接到其输入端,因此开关电源的电压是相对稳定的。 Typically, ordinary alternating current electric power switching power supply through the transformer, rectifier, to the input terminal, the voltage switching power supply is relatively stable. 然而在光伏并网系统中,太阳能电池板输出的直流电直接接到辅助电源的输入端,不再经过整流环节;另外随着太阳光照強度和环境温度的变化,光伏阵列输出端的电压会出现较大的波动。 However, in the photovoltaic grid system, the DC output of the solar cell panel is directly connected to the input of the auxiliary power supply is no longer part of the rectified; Also with the changes in solar light intensity and ambient temperature, the voltage output of a photovoltaic array be greater fluctuations. 因此光伏并网逆变器的辅助电源的输入端电压是不稳定的,这就要求太阳能逆变器辅助电源系统的工作电压范围更宽。 Therefore the input voltage of the PV inverter with the auxiliary power source is unstable, which requires auxiliary power supply system a solar inverter operating voltage range is wider. 但是在实际的应用中,往往会遇到因光伏阵列输出功率波动,无法时刻满足系统功率需求,致使辅助电源反复启停;或虽辅助电源能启动,但达不到需要的宽输入电压范围内辅助电源正常工作的问题。 However, in practical applications, often encounter a photovoltaic array output due to power fluctuations, can not always meet the system power requirements, resulting in repeated start and stop the auxiliary power supply; or can start although auxiliary power, but within a wide input voltage range up to less than the required auxiliary power to work the problem.

发明内容 SUMMARY

[0003] 本发明的目的是提供一种开启电压值可设定,可避免反复启停,功耗小且效率高的太阳能光伏逆变器辅助电源系统。 [0003] The object of the present invention is to provide a turn-on voltage value can be set, can avoid repeated start and stop, low power consumption and high efficiency solar photovoltaic inverter auxiliary power supply system.

[0004] 为了达到上述目的,本发明的技术方案是提供了一种光伏逆变器辅助电源系统,其特征在于:包括启动电路单元,启动电路单元的输入端与与逆变器DC直流母线电压相连,逆变器DC直流母线电压还连接电源转换电路,电源转换电路包括反激变压器及电源控制单元,启动电路单元的输出端连接限流延时触发电路单元,在启动过程中,由限流延时触发电路単元为电源控制单元提供开通阈值电压从而使得反激变压器工作,电源控制単元的使能端连接控制単元,控制单元根据后端检测保护电路单元产生的第二电压控制信号使能电源控制単元,电源控制単元与自举电路单元相连,当电源控制単元能够产生稳定的直流电压后,自举电路单元在后端检测保护电路单元产生的第一电压控制信号的控制下工作,由自举电路单元控制限流延时触发电路単元为电源控 [0004] To achieve the above object, the technical solution of the present invention is to provide a photovoltaic inverter auxiliary power supply system, characterized by: starting circuit includes an input unit, and the initiation circuit unit of the inverter DC bus voltage DC connected to the inverter DC bus voltage is also connected to the DC power conversion circuit, the power supply circuit comprises a flyback converter transformer and a power control unit, starts the output circuit unit is connected to the current limiting unit delay trigger circuit, during startup, a flow restrictor delayed flip-flop circuit radiolabeling membered provide turn-on threshold voltage of the power supply control unit so that the flyback transformer work, the power supply control radiolabeling membered enable terminal connected to the control radiolabeling element, controlling the second voltage control signal generation unit according to the rear end detection protection circuit unit enabling supply control radiolabeling element, the power supply control radiolabeling element connected to the bootstrap circuit unit when the power control radiolabeling element capable of generating a stable DC voltage, from under the control of a first voltage control signal bootstrap circuit unit at the rear end detection protection circuit unit generated by the self- bootstrap circuit unit controls the delay flip-flop circuit current limiting element is a power supply controller radiolabeling 单元提供工作电压V。 Cell operating voltage V. . ,同吋,由自举电路单元将启动电路单元关闭,从而完成启动过程。 Circuit unit, with inch unit by a bootstrap circuit will start off, thereby completing the boot process.

[0005] 优选地,所述启动电路单元包括第一稳压ニ极管,第一稳压ニ极管的阴极连接所述逆变器DC直流母线电压,第一稳压ニ极管的阳极分别与第一电阻及MOSFET管的漏极相连,第一电阻依次串联第二电阻及第三电阻,第三电阻与第三稳压ニ极管的阴极相连,第三稳压ニ极管的阳极连接第二ニ极管的阳极,第二ニ极管的阴极连接所述自举电路单元,第一MOSFET管的源极连接第四电阻,第四电阻与所述自举电路单元相连,第一MOSFET管的栅极连接第一三极管的集电极,第一三极管的基极与第五电阻相连,第五电阻连接所述自举电路单元,第一三极管的射极连接第四稳压ニ极管的阴极,第四稳压ニ极管的阳极接地,由第一三极管的基极通过第五电阻给出启动电压Utl,第一稳压ニ极管及第三稳压ニ极管的稳压值及启动电压U0之和为开启启动电路单元的直流母线电 [0005] Preferably, the starting circuit unit includes an anode of a first diode regulator ni, ni regulator connected to the cathode of the first diode of the inverter DC DC bus voltage, a first regulator diode ni a first resistor and to the drain of the MOSFET is connected to a first resistor in series a second resistor and a third resistor, a third resistor and a third voltage regulator diode Ni cathode, the anode of the third diode is connected to the regulator ni Ni anode of the second diode, the cathode of the second diode is connected to the Ni bootstrap circuit unit, the first source of the MOSFET is connected to a fourth resistor, a fourth resistor connected to the bootstrap circuit unit, a first MOSFET the collector of the first transistor connected to the gate of the tube, the first base of the transistor and the fifth resistor connected to the fifth resistor connected to the bootstrap circuit unit, a first transistor connected to the emitter of the fourth ni regulator diode cathode, the anode is grounded ni fourth regulator diode, the first base of the transistor is given by the starting voltage Utl fifth resistor, a first zener diode, and a third regulator ni ni and the voltage value of the starting voltage U0 and the diode is turned on the DC bus enable circuit unit 最小值,即当逆变器直流母线电压值高于该最小值时,启动电路单元才开始工作。 Minimum, i.e., when the inverter DC bus voltage value is higher than the minimum value, the initiation circuit unit to start work. [0006] 优选地,所述电源转换电路包括反激变压器,反激变压器的初级线圈的一端连接所述直流母线电压,另一端连接第二MOSFET管的漏扱,由反激变压器的次级线圈的电压输出端产出输出电压Vwt,反激变压器的次级线圈的电压输出端还接回电源控制単元的稳压输入端,电源控制単元的输出端连接第二MOSFET管的栅极,第二MOSFET管的源极分别通过第十八电阻接地及连接所述控制単元。 [0006] Preferably, one end of the power conversion circuit comprises a flyback transformer, a flyback transformer primary winding is connected to the DC bus voltage, and the other end connected to the drain of the second MOSFET transistor Qi of the secondary winding of the flyback transformer the voltage output terminal outputs the output voltage Vwt, the voltage output of the secondary winding of the flyback transformer is also connected back to the input of regulator power supply control element radiolabeling, radiolabeling power control element connected to the gate of the second output terminal of the MOSFET, the second the source electrode of the MOSFET is grounded and eighteenth resistor respectively connected to the control element radiolabeling.

[0007] 优选地,所述控制単元包括第五三极管,第五三极管的基极通过第十电阻连接所述第二电压控制信号,在第五三极管的发射极与基极之间跨接第十一电阻,第五三极管的发射极连接參考电压VMf,第五三极管的集电极分别连接所述电源控制单元的使能端及所述第二MOSFET管的源极。 [0007] Preferably, the radiolabeling the control element includes a fifth transistor, the fifth transistor base voltage control signal via a second connecting said tenth resistor, an emitter of the fifth transistor and the base an eleventh resistor connected between the emitter across the fifth transistor is connected to a reference voltage VMF, the collector of the fifth transistor are connected to the power control unit and the enable terminal of the source of the second MOSFET, pole.

[0008] 优选地,所述限流延时触发电路単元包括限流电路及第ー电容,所述启动电路单元通过限流电路为第一电容充电,在启动阶段,由充电后的第一电容为所述电源控制单元提供所述开通阈值电压,在所述自举电路单元启动后,由所述自举电路单元通过限流延时触发电路単元包括的分压电阻为所述电源控制単元提供工作电压V。 [0008] Preferably, said current limiting element comprises a delayed flip-flop circuit radiolabeling ー limiting circuit and a second capacitor, said starting circuit capacitor is charged by means of the first current limiting circuit, the start-up phase, the first capacitor after charging the power control unit to provide the turn-on threshold voltage, said bootstrap circuit in the unit starts, by the bootstrap circuit unit through the current limiting element comprises a delayed flip-flop circuit radiolabeling dividing resistors to the power control element provided radiolabeling Operating voltage V. . .

[0009] 优选地,所述自举电路单元包括第四三极管,第四三极管的集电极分别连接第六ニ极管及第五ニ极管的阳极,第六ニ极管及第五ニ极管的阴极分别连接所述启动电路单元及所述限流延时触发电路単元,第四三极管的发射极连接所述电源转换电路,第四三极管的基极通过第九电阻连接所述第一电压控制信号。 [0009] Preferably, the bootstrap circuit means comprises a fourth transistor, the collector of the fourth transistor are connected to a sixth Ni Ni anode electrode, and the fifth diode, a sixth diode second ni ni five diode cathode is connected to the starting circuit means and said current limiting element radiolabeling delay trigger circuit, an emitter of the fourth transistor is connected to the power conversion circuit, the fourth through the ninth transistor base a first resistor connected to the voltage control signal.

[0010] 本发明的优点是:采用双闭环反馈控制系统,保证辅助电源的输出电压稳定;采用控制信号与控制器复位电路逻辑组合,保证了控制的稳定运行,防止因电源不稳而使控制系统不稳定产生秩序紊乱。 [0010] The advantage of the present invention are: a dual closed loop feedback control system to ensure stability of the output voltage of the auxiliary power source; employed in combination with a control signal logic controller reset circuit, ensure the stable operation of the control, power supply to prevent the control instability system instability generated order disturbances. 本发明更进ー步的优点是:1、由反向ニ极管构成的启动电路可以设定辅助电源系统开启电压值及启动功率,从而避免辅助电源在光照过弱的情况下开启,保护逆变器;启动电路只工作在启动过程中,电源稳定后,启动电路自动关闭;2、辅助电源系统工作范围宽,系统无损失,功耗极低,特别适合光伏逆变系统使用。 The present invention goes further ー advantages are: 1, the writing is started by the reverse diode circuit can be set to turn on the auxiliary power supply system voltage and the starting power, the auxiliary power source is turned on in order to avoid the case where the light is too weak to protect against variable; a start circuit only during startup, after the power stabilization, the starting circuit is automatically closed; 2, auxiliary power supply system wide working range of the system without loss, low power consumption, especially for photovoltaic inverter system.

附图说明 BRIEF DESCRIPTION

[0011] 图I为本发明提供的辅助电源系统在整个光伏逆变系统的位置示意图; [0011] I FIG auxiliary power supply system of the present invention provides a schematic view of the position of the entire PV inverter system;

[0012] 图2为本发明提供的光伏逆变器辅助电源系统控制流程图; [0012] FIG. 2 photovoltaic inverter of the present invention provides auxiliary power supply system control flow chart;

[0013] 图3为光伏逆变器启动自举电路图; [0013] FIG. 3 is a photovoltaic inverter bootstrap startup circuit diagram;

[0014] 图4为光伏逆变器辅助电源转换及控制电路图。 [0014] FIG. 4 is an auxiliary power converter and control circuit diagram of a photovoltaic inverter.

具体实施方式 detailed description

[0015] 为使本发明更明显易懂,兹以一优选实施例,并配合附图作详细说明如下。 [0015] To make the present invention more comprehensible, hereby to a preferred embodiment accompanied with figures are described in detail below.

[0016] 本发明针对光伏逆变器辅助电源的要求,设计ー种启动后便可实现自举,可避免反复启停,功耗小且效率高的太阳能光伏逆变器辅助电源系统。 [0016] The present invention is directed to a photovoltaic inverter in claim auxiliary power source, the latter can be realized design ー bootstrap start, can avoid repeated start and stop, power consumption and high efficiency solar photovoltaic inverter auxiliary power supply system. 该系统在光伏逆变系统中的位置如图I所示,一端与逆变器DC直流母线电压相连,另一端与检测保护电路単元相连并输出逆变器各部所需供电电压。 The PV inverter system location system shown in Figure I, connected to the DC end of the inverter DC bus voltage, the other end of the detection element coupled to the protection circuit radiolabeling departments required output of the inverter and a supply voltage. 结合图3及图3,本发明具体包括五个电路単元,分别为启动电路单元I、限流延时触发电路单元2、自举电路单元3、电源转换电路单元4及控制电路单元5。 In conjunction with FIG. 3 and FIG. 3, the present invention specifically includes 3, a power converter circuit unit 4 and a control circuit unit 5 radiolabeling five circuit element, respectively, the initiation circuit unit I, limiting the delay flip-flop circuit unit 2, the bootstrap circuit unit. 启动电路单元I的输入端与逆变器DC直流母线电压相连,逆变器DC直流母线电压还连接电源转换电路4,电源转换电路4包括反激变压器Tl及电源控制単元,启动电路单元I的输出端连接限流延时触发电路単元2,在启动过程中,由限流延时触发电路単元2为电源控制単元提供开通阈值电压从而使得反激变压器Tl工作,电源控制単元的使能端CS连接控制単元5,控制单元5根据后端检测保护电路单元产生的第二电压控制信号K2使能电源控制単元,电源控制単元与自举电路单元3相连,当电源控制単元能够产生稳定的直流电压后,自举电路单元3在后端检测保护电路单元产生的第一电压控制信号Kl的控制下工作,由自举电路单元3控制限流延时触发电路単元2为电源控制单元提供工作电压V。 Start circuit unit I input terminal of the inverter DC voltage is connected to the DC bus, the inverter DC bus voltage DC power conversion circuit 4 is also connected, the power conversion circuit 4 includes a flyback transformer Tl and radiolabeling power control element, the startup circuit unit I an output terminal connected to the current limiting delayed flip-flop circuit radiolabeling element 2, during startup by limiting the delay flip-flop circuit radiolabeling element 2 power control radiolabeling membered provide turn-on threshold voltage so that the flyback transformer Tl work, the power supply control radiolabeling membered enable terminal CS the connection control radiolabeling unit 5, the control unit 5 to enable the power supply control radiolabeling element according to a second voltage control signal K2 rear detection protection circuit unit generated power control radiolabeling membered bootstrap circuit unit 3 is connected, when the DC voltage of the power supply control radiolabeling membered result in stable after, since the first voltage control signal under the control of Kl bootstrap circuit protection unit 3 at the rear end detecting circuit unit generates operation, the control circuit 3 from the radiolabeling bootstrap circuit current limiting element 2 unit delay trigger the power control unit to provide the operating voltage V . . ,同时,由自举电路单元3将启动电路单元I关闭,从而完成启动过程。 Meanwhile, the bootstrap circuit unit 3 units I starting circuit is closed, thereby completing the boot process.

[0017] 辅助电源系统具体实施例电路如图3和图4所述。 EXAMPLE circuit shown in [0017] particular embodiment of the auxiliary power supply system 3 and FIG 4. 此电路除能实时检测母线电压,还能根据设定的电压阈值按顺序先后开启辅助电源系统的启动电路単元I、限流延时触发电路単元2、自举电路单元3、电源转换电路単元4,井能在母线电压掉落时防止辅助电源的反复启停。 The circuit in addition to real-time detection bus voltage, also according to the voltage threshold value is set in sequence successively turned on to start the auxiliary power supply system circuit radiolabeling element I, limiting the delay flip-flop circuit radiolabeling unit 2, the bootstrap circuit unit 3, the power conversion circuit radiolabeling Element , wells repeatedly start and stop the auxiliary power supply can be prevented when the bus voltage drop. 具体说明如下: Specified as follows:

[0018]启动电路单元I包括第一稳压ニ极管Dl,第一稳压ニ极管Dl的阴极连接所述逆变器DC直流母线电压,第一稳压ニ极管Dl的阳极分别与第一电阻Rl及MOSFET管Ml的漏极相连,第一电阻Rl依次串联第二电阻R2及第三电阻R3,第三电阻R3与第三稳压ニ极管D3的阴极相连,第三稳压ニ极管D3的阳极连接第二ニ极管D2的阳极,第二ニ极管D2的阴极连接自举电路単元3的第六ニ极管D6的阴极,第一MOSFET管Ml的源极连接第四电阻R4,第四电阻R4与自举电路单元3的第六ニ极管D6的阴极相连,第一MOSFET管Ml的栅极连接第一三极管Ql的集电极,第一三极管Ql的基极与第五电阻R5相连,第五电阻R5连接所述自举电路单元3,第一三极管Ql的射极连接第四稳压ニ极管D4的阴极,第四稳压ニ极管D4的阳极接地,由第一三极管Ql的基极通过第五电阻R5给出启动电压U。 [0018] The initiation circuit unit I comprises a first regulator diode Dl ni, ni first zener diode cathode connected to the inverter DC bus voltage DC Dl, the first zener diode Dl anode ni respectively drain of the first resistor Rl and the MOSFET Ml is connected to the first resistor Rl in series a second resistor R2 and the third resistor R3, a third resistor R3 and the diode is connected to the third regulator Ni cathode of D3, the third regulator ni cathode diode D3 is connected to the anode of the anode of the second diode D2 is ni, ni a second diode D2 is connected bootstrap circuit 3 radiolabeling ni membered sixth diode D6 cathode, the source of the first MOSFET Ml is connected to the first tube four resistor R4, the fourth resistor R4 and the cathode of the bootstrap circuit unit 3 ni sixth diode D6 is connected to the collector of the first transistor Ql is connected to the gate of the first MOSFET transistor Ml, the first transistor Ql a base of the fifth resistor R5 is connected to a fifth resistor R5 connected to the bootstrap circuit unit 3, the emitter of the first transistor Ql is connected the cathode of the fourth diode D4 regulator of Ni, Ni regulator fourth electrode D4 tube anode is grounded by the base of the first transistor Ql of the fifth resistor R5 is given by the starting voltage U. ,启动电压U0由第四稳压ニ极管D4决定,第一稳压ニ极管Dl及第三稳压ニ极管D3的稳压值及启动电压U0之和为开启启动电路单元的直流母线电压最小值,即当逆变器直流母线电压值高于该最小值时,启动电路单元才开始工作。 , Starting from the fourth voltage U0 regulator diode D4 decision ni, ni first zener diode Dl and a third Ni regulator diode D3 and the voltage value of the starting voltage U0 startup DC bus and the open circuit cell is voltage minimum value, i.e., when the inverter DC bus voltage value is higher than the minimum value, the initiation circuit unit to start work.

[0019] 限流触发电路単元2包括由第二三极管Q2、第三三极管Q3、第六电阻R6及第七电阻R7构成的限流电路。 [0019] limiting element 2 radiolabeling trigger circuit comprises a second transistor Q2, a third transistor Q3, the sixth resistor R6 and seventh resistor R7 limiting circuit configuration. 在启动电路单元I生成约为电压基准值的启动电压Utl的过程中,通过第六电阻R6及以第二三极管Q2、第三三极管Q3为主要元件构成的限流电路给第一电容Cl充电,当第一电容Cl的电压达到电源控制単元中的电源控制芯片的开通阈值电压后,由电源控制芯片触发反激变压器Tl工作。 In the initiation circuit unit generates about I Utl voltage during starting voltage reference value by the sixth resistor R6 and a current limiting circuit to a second transistor Q2, a third transistor Q3 constitutes the main element to the first Cl charging capacitor, when the voltage of the first capacitor Cl reaches the turn-on threshold voltage of the power supply control of the power control element chip radiolabeling, the flyback transformer Tl work triggered by power control chip. 限流电路的作用是防止给第一电容Cl充电的电流过大,使启动电路负载过重。 Effect of the current limiting circuit is to prevent charging of the first capacitor Cl current is too large, the starter circuit overload.

[0020] 如图4所示,电源转换电路4包括反激变压器Tl,在反激变压器Tl的初级线圈上连接有第十九电阻R19、第六电容C6、第十稳压ニ极管DlO及第九稳压ニ极管D9,其初级线圈的一端连接直流母线电压,另一端连接第二MOSFET管M2的漏扱。 [0020] 4, the power conversion circuit 4 includes a flyback transformer Tl, a nineteenth resistor R19 is connected across the primary winding of the flyback transformer Tl, sixth capacitor C6, a tenth diode DlO and regulator ni ni regulator ninth diode D9, which is connected to one end of the primary coil voltage DC bus, and the other end connected to the drain of the second MOSFET transistor M2 is Cha. 由反激变压器Tl的次级线圈的电压输出端产出输出电压Vrat,在该次级线圈上连接有第七ニ极管D7、第八ニ极管D8、第一熔断器F1、第二熔断器F2、第四电容C4、第五电容C5、第二十电阻R20及第ニi^一电阻R21。 A voltage output terminal outputs the output voltage of the secondary winding of the flyback transformer Vrat of Tl, on which coil is connected to a seventh ni diode D7, the eighth diode D8 ni, a first fuse F1, a second fuse is F2, the fourth capacitor C4, fifth capacitor C5, resistor R20 and the second twenty-ni i ^ a resistor R21. 反激变压器Tl的次级线圈的电压输出端还接回电源控制単元的稳压输入端FB。 The voltage output of the secondary winding of the flyback transformer Tl also back to the power control input of the regulator element radiolabeling FB. 其中,电源控制单元采用电源控制芯片UCC2801D。 Wherein the power control unit applies power control chip UCC2801D. 次级线圈的电压输出端通过由第十二电阻R12及第十三电阻R13组成的分压电路分压后,再通过第十四电阻R14、第十五电阻R15、第二电容C2及第三电容C3连接电源控制芯片UCC2801D的稳压输入端FB。 After the voltage at the output of the secondary winding by the voltage dividing circuit dividing by the twelfth resistor R12 and a thirteenth resistor R13 composition, and then through a fourteenth resistor R14, a fifteenth resistor R15, a second capacitor C2 and the third control chip capacitor C3 is connected UCC2801D regulator input FB. 电源控制芯片UCC2801D的输出端OUT连接由第十六电阻R16及第十七电阻R17组成的分压电路,第二MOSFET管M2的栅极连接第十七电阻R17。 UCC2801D control chip output terminal OUT by the voltage dividing circuit connected sixteenth resistor R16 and a seventeenth resistor R17 composed gate of the second MOSFET transistor M2 is connected to a seventeenth resistor R17. 第二MOSFET管M2的源极分别通过第十八电阻R18接地及连接控制单元5。 Source of the second MOSFET transistor M2 is respectively an eighteenth resistor R18 is connected to ground and the control unit 5.

[0021 ] 控制单元5包括第五三极管Q5,第五三极管Q5的基极通过第十电阻RlO连接第二电压控制信号K2,在第五三极管Q5的发射极与基极之间跨接第十一电阻R11,第五三极管Q5的发射极连接參考电压Vref,第五三极管Q5的集电极分别连接电源控制芯片UCC2801D的使能端CS及第ニMOSFET管M2的源极。 [0021] The control unit 5 includes a fifth transistor Q5, the base of the fifth transistor Q5 is connected tenth resistor RlO K2 by the second voltage control signal, the emitter electrode and the base of the fifth transistor Q5 between the eleventh resistor connected across R11, transmits the fifth transistor Q5 is connected to the reference voltage Vref, the collector of the fifth transistor Q5 are connected to the control chip enable terminal CS UCC2801D second MOSFET transistor M2 is Ni source.

[0022]自举电路单元3包括第四三极管Q4,第四三极管Q4的集电极分别连接第六ニ极管D6及第五ニ极管D5的阳极,第六ニ极管D6及第五ニ极管D5的阴极分别连接所述启动电路单元I及所述限流延时触发电路単元2,第四三极管Q4的发射极连接所述电源转换电路4,第四三极管Q4的基极通过第九电阻R9连接第一电压控制信号Kl。 [0022] The bootstrap circuit unit 3 includes a fourth transistor Q4, the collector of the fourth transistor Q4 are respectively connected to a sixth diode D6 Ni Ni, and a fifth diode D5 the anode of the sixth diode D6 and ni the fifth diode D5 Ni cathode is connected to the starting circuit unit I and the delay flip-flop circuit radiolabeling limiting element 2, to transmit a fourth transistor Q4 is connected to the power conversion circuit 4, the fourth transistor the base of Q4 ninth resistor R9 are connected through a first voltage control signal Kl.

[0023] 本发明提供的辅助电源系统由后端检测保护电路单元产生的第一电压控制信号Kl连接到自举电路单元3构成闭环反馈,同吋,由该检测保护电路单元产生的第二电压控制信号K2信号连接到电源转换电路単元4构成闭环反馈。 [0023] The first voltage control signal Kl provides auxiliary power supply system according to the present invention produced by the rear end detecting means connected to the protection circuit unit 3 is composed of a bootstrap circuit feedback loop, with the inch, the second detection voltage generated by the protection circuit unit control signal K2 to the power conversion circuitry connected to the signal unit 4 form a closed loop feedback radiolabeling.

[0024] 本发明的辅助电源系统控制流程见图2,其中需说明的是:1.第二电压控制信号K2不稳定,使第一电压控制信号Kl也不稳定,辅助电源无法正常工作;2.第二电压控制信号K2稳定后,辅助电源才能够开启,电源在电压设定范围内自举,使得辅助电源芯片正常 [0024] The auxiliary power supply system according to the present invention, the control flow shown in Figure 2, which should be noted: a second voltage control signal is unstable K2, Kl of the first voltage control signal is not stable, the auxiliary power supply does not work; 2 after the second control voltage signal K2 stable, able to turn on the auxiliary power supply, the power in the bootstrap voltage setting range, so that the auxiliary power chip normal

工作。 jobs.

[0025] 当逆变器DC直流母线电压大于开启启动电路单元的直流母线电压最小值时,启动电路単元I启动并输出启动电压U。 [0025] When the inverter DC Link voltage is greater than the minimum DC link voltage is turned on to start circuit unit, start-up circuit and outputting radiolabeling I promoter element starting voltage U. ,同时,通过第二电压控制信号K2将置于高电平使能电源控制芯片UCC2801D,否则,第二电压控制信号K2始终保持在低电平。 Meanwhile, the second voltage control signal K2 set high to enable the power control chip UCC2801D, otherwise, the second voltage control signal K2 is always maintained at a low level. 由启动电压U0为第一电容Cl充电,当第一电容Cl充满后,通过电源控制芯片UCC2801D的工作电源端ロVcc为其提供开通阈值电压,电源控制芯片UCC2801D开始工作。 The first capacitor Cl is charged by the starting voltage U0, when the first capacitor Cl is filled by the working power supply terminal Vcc control chip UCC2801D ro provide a turn-on threshold voltage, the power supply control chip UCC2801D work. 由电源控制芯片UCC2801D控制反激变压器Tl产生直流电压,该直流电压反馈回电源控制芯片UCC2801D的稳压输入端FB,由电源控制芯片UCC2801D将其稳压后,输出稳定直流电压。 DC voltage is generated by a controlled flyback transformer Tl UCC2801D power control chip, the DC voltage is fed back to the regulator power supply input terminal FB control chip UCC2801D by the power control chip UCC2801D after its regulator, the output DC voltage stability. 判断该稳定直流电压是否稳定,若稳定,则将第一电压控制信号Kl置于高电平从而开启自举电路单兀3,在此之前第一电压控制信号Kl 一直处于低电平状态。 Analyzing the stable DC voltage is stable, if stable, then the first voltage control signal at high level thereby turning Kl bootstrap circuit unit 3 Wu, before Kl has a first voltage control signal in a low level state. 自举电路单元3将该稳定直流电压加至第五ニ极管D5及第六ニ极管D6的阳极,由第五ニ极管D5通过第八电阻R8为电源控制芯片UCC2801D提供工作电压V。 The bootstrap circuit unit 3 is stabilized DC voltage applied to the fifth and sixth ni ni diode D5 D6 is its anode, the fifth diode D5 Ni operating voltage for the power control chip through the eighth resistor R8 V. UCC2801D . ,使得电源控制芯片UCC2801D能够通过输出端OUT输出PWM信号,从而使得反激变压器Tl形成不同电位的电压给太阳能逆变器各部分供电。 Such UCC2801D power control chip through the output terminal OUT outputs a PWM signal, so that the flyback transformer Tl forming portions different potential supply voltage to the solar inverter. 同时第六ニ极管D6则将第一三极管Ql的集电极电位强制上拉,使第一三极管Ql饱和导通,继而使第一MOSFET管Ml的栅极电位下拉至约电压基准值,第一MOSFET管Ml截止,从而启动电路単元I关闭,辅助电源启动过程结束。 While the collector potential of the sixth diode D6 ni first transistor Ql will forcibly pull the first transistor Ql saturated conduction, then the gate potential of the first MOSFET transistor Ml is pulled down to approximately the reference voltage value, the first MOSFET transistor Ml is turned off, so that the starting circuit element radiolabeling I closed, the auxiliary power startup process ends.

Claims (6)

  1. 1. 一种光伏逆变器辅助电源系统,其特征在干:包括启动电路单元(1),启动电路单元(I)的输入端与与逆变器DC直流母线电压相连,逆变器DC直流母线电压还连接电源转换电路(4),电源转换电路(4)包括反激变压器(Tl)及电源控制単元,启动电路单元(I)的输出端连接限流延时触发电路単元(2),在启动过程中,由限流延时触发电路単元(2)为电源控制単元提供开通阈值电压从而使得反激变压器(Tl)工作,电源控制単元的使能端(CS)连接控制単元(5),控制单元(5)根据后端检测保护电路单元产生的第二电压控制信号(K2)使能电源控制単元,电源控制単元与自举电路单元(3)相连,当电源控制単元能够产生稳定的直流电压后,自举电路单元(3)在后端检测保护电路单元产生的第一电压控制信号(Kl)的控制下工作,由自举电路单元(3)控制限流延时触发电路 1. A photovoltaic inverter auxiliary power supply system, characterized in that the dry: a starting circuit means (1), the initiation circuit unit (I) and the input terminal of the inverter DC voltage is connected to the DC link, the inverter DC DC bus voltage is also connected power conversion circuit (4), power conversion circuit (4) comprises a flyback transformer (Tl) and a power supply control radiolabeling element, the initiation circuit unit (I) connected to the output current limiting delayed flip-flop circuit radiolabeling element (2), during startup by limiting the delay flip-flop circuit radiolabeling element (2) for the power control radiolabeling membered provide turn-on threshold voltage so that the flyback transformer (Tl) work, the power supply control radiolabeling membered enable terminal (CS) connected to the control radiolabeling element (5) , the second voltage control unit (5) the rear end detection protective circuit means generates a control signal (K2) to enable power control radiolabeling element, the power control is connected to radiolabeling membered bootstrap circuit unit (3), when the power supply control radiolabeling membered result in stable DC voltage, the bootstrap circuit unit (3) under the control of a first control voltage signal (Kl) detecting the rear end of the protection circuit unit generates, bootstrap circuit unit (3) controls the restrictor from the delay flip-flop circuit 元(2)为电源控制单元提供工作电压V。 Element (2) to provide the working voltage of the power control unit V. . ,同时,由自举电路单元(3)将启动电路单元(I)关闭,从而完成启动过程。 Meanwhile, the bootstrap circuit unit (3) will start circuit unit (I) is closed, thereby completing the boot process.
  2. 2.如权利要求I所述的ー种光伏逆变器辅助电源系统,其特征在于:所述启动电路单元(I)包括第一稳压ニ极管(Dl),第一稳压ニ极管(Dl)的阴极连接所述逆变器DC直流母线电压,第一稳压ニ极管(Dl)的阳极分别与第一电阻(Rl)及MOSFET管(Ml)的漏极相连,第一电阻(Rl)依次串联第二电阻(R2)及第三电阻(R3),第三电阻(R3)与第三稳压ニ极管(D3)的阴极相连,第三稳压ニ极管(D3)的阳极连接第二ニ极管(D2)的阳极,第二ニ极管(D2)的阴极连接所述自举电路单元(3),第一MOSFET管(Ml)的源极连接第四电阻(R4),第四电阻(R4)与所述自举电路单元(3)相连,第一MOSFET管(Ml)的栅极连接第一三极管(Ql)的集电极,第一三极管(Ql)的基极与第五电阻(R5)相连,第五电阻(R5)连接所述自举电路単元(3),第一三极管(Ql)的射极连接第四稳压ニ极管(D4)的阴极,第四稳压ニ 2. I claim ー seed PV inverter auxiliary power supply system, characterized in that: said starting circuit unit (I) comprises a first Ni regulator diode (Dl), a first zener diode ni the anode (Dl) cathode connected to the DC bus of the inverter DC voltage, a first regulator ni diode (Dl) are connected to the drain of the first resistor (Rl) and the MOSFET (of Ml), the first resistor (Rl) in series a second resistor (R2) and the third resistor (R3), a third resistor (R3) and the third Ni regulator diode (D3) is connected to the cathode of the third diode regulator Ni (D3) Ni anode connected to the anode of the second diode (D2), the second ni diode (D2) connected to the cathode of the bootstrap circuit unit (3), a first source of the MOSFET (of Ml) is connected to a fourth resistor ( R4), a fourth resistor (R4) and the bootstrap circuit unit (3) is connected to the collector of the first gate of the MOSFET (of Ml) is connected to a first transistor (Ql,), the first transistor ( QL) base and the fifth resistor (R5) connected to the fifth resistor (R5) connected to said bootstrap circuit radiolabeling element (3), a first transistor (QL) connected to the emitter of a fourth regulator diode ni (D4) cathode, the fourth regulator ni 极管(D4)的阳极接地,由第一三极管(Ql)的基极通过第五电阻(R5)给出启动电压Utl,第一稳压ニ极管(Dl)及第三稳压ニ极管(D3)的稳压值及启动电压Utl之和为开启启动电路单元的直流母线电压最小值,即当逆变器直流母线电压值高于该最小值时,启动电路单元才开始工作。 The anode is grounded diode (D4) by the first transistor (Ql,) the base is given by the starting voltage Utl fifth resistor (R5), Ni first regulator diode (Dl) and a third regulator ni diode (D3) and the starting voltage regulation value Utl sum of the minimum DC bus voltage turn initiation circuit unit, i.e., when the inverter DC bus voltage value is higher than the minimum value, the initiation circuit unit to start work.
  3. 3.如权利要求I所述的ー种光伏逆变器辅助电源系统,其特征在于:所述电源转换电路(4)包括反激变压器(Tl),反激变压器(Tl)的初级线圈的一端连接所述直流母线电压,另一端连接第二MOSFET管(M2)的漏极,由反激变压器(Tl)的次级线圈的电压输出端产出输出电压Vwt,反激变压器(Tl)的次级线圈的电压输出端还接回电源控制単元的稳压输入端(FB),电源控制单元的输出端(OUT)连接第MOSFET管(M2)的栅极,第二MOSFET管(M2)的源极分别通过第十八电阻(R18)接地及连接所述控制単元(5)。 3. ー species photovoltaic inverter I of the auxiliary power supply system as claimed in claim, characterized in that: said power conversion circuit (4) comprises a flyback transformer (Tl), one end of the primary winding of the flyback transformer (Tl) of connecting the DC bus voltage, and the other end connected to the drain of a second MOSFET transistor (M2) by the voltage output terminal outputs the output voltage Vwt secondary winding of the flyback transformer (Tl) of the flyback transformer (Tl) of the time voltage at the output of the coil is also connected back to the power control element radiolabeling regulator input (the FB), the control unit of the power supply output terminal (OUT) connected to the gate of the MOSFET (M2), and a second MOSFET transistor (M2) source electrodes respectively eighteenth resistor (R18) connected to ground and radiolabeling the control element (5).
  4. 4.如权利要求3所述的ー种光伏逆变器辅助电源系统,其特征在于:所述控制単元(5)包括第五三极管(Q5),第五三极管(Q5)的基极通过第十电阻(RlO)连接所述第二电压控制信号(K2),在第五三极管(Q5)的发射极与基极之间跨接第i^一电阻(Rll),第五三极管(Q5)的发射极连接參考电压Vref,第五三极管(Q5)的集电极分别连接所述电源控制单元的使能端(CS)及所述第MOSFET管(M2)的源极。 4. ー species photovoltaic inverter according to claim 3, wherein the auxiliary power supply system, characterized in that: said control radiolabeling element (5) comprises a fifth transistor (Q5), a fifth transistor (Q5) of the group electrode connected to the second voltage control signal (K2) through a tenth resistor (RlO to), the first i ^ across a resistor (Rll) between the emitter and the base electrode of the fifth transistor (Q5), the fifth the emitter of transistor (Q5) is connected to the reference voltage Vref, the collector of the fifth transistor (Q5) are connected to the power control unit enable terminal (CS) and the second MOSFET transistor (M2) source pole.
  5. 5.如权利要求I所述的ー种光伏逆变器辅助电源系统,其特征在于:所述限流延时触发电路単元(2)包括限流电路及第ー电容(Cl),所述启动电路单元(I)通过限流电路为第ー电容(Cl)充电,在启动阶段,由充电后的第一电容(Cl)为所述电源控制単元提供所述开通阈值电压,在所述自举电路单元(3)启动后,由所述自举电路单元(3)通过限流延时触发电路单元(2)包括的分压电阻为所述电源控制単元提供工作电压V。 5. I claim ー seed PV inverter auxiliary power supply system, wherein: said delay flip-flop circuit radiolabeling limiting element (2) comprises a second current limiting circuit ー capacitor (Cl), the activation circuit unit (I) of ー capacitor (Cl) is charged by a current limiting circuit, the start-up phase, a first capacitor (Cl) after radiolabeling charging the power control element providing the turn-on threshold voltage, said bootstrap after the circuit unit (3) starts, by the bootstrap circuit unit (3) by limiting the delay flip-flop circuit means (2) comprises a voltage dividing resistor for said power control element radiolabeling operating voltage V. . .
  6. 6.如权利要求I所述的ー种光伏逆变器辅助电源系统,其特征在于:所述自举电路单元(3)包括第四三极管(Q4),第四三极管(Q4)的集电极分别连接第六ニ极管(D6)及第五ニ极管(D5)的阳极,第六ニ极管(D6)及第五ニ极管(D5)的阴极分别连接所述启动电路単元(I)及所述限流延时触发电路単元(2),第四三极管(Q4)的发射极连接所述电源转换电路(4),第四三极管(Q4)的基极通过第九电阻(R9)连接所述第一电压控制信号(Kl)。 6. ー species photovoltaic inverter I of the auxiliary power supply system as claimed in claim, characterized in that: said bootstrap circuit unit (3) comprises a fourth transistor (Q4), a fourth transistor (Q4) the collectors connected Ni sixth diode (D6) Ni, and a fifth diode (D5) anode, Ni sixth diode (D6) Ni, and a fifth diode (D5) cathode is connected to the starting circuit radiolabeling element (I) and the group delay flip-flop circuit radiolabeling limiting element (2), the fourth transistor (Q4) connected to the emitter of the power converter circuit (4), a fourth transistor (Q4) of the electrode the first voltage control signal (Kl) connected through a ninth resistor (R9).
CN 201210166951 2012-05-24 2012-05-24 PV inverter auxiliary power supply system CN102694471B (en)

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CN103956889A (en) * 2014-04-30 2014-07-30 瑞斯康达科技发展股份有限公司 Enable signal control circuit and power circuit
CN104124698A (en) * 2013-04-25 2014-10-29 惠州天能源逆变技术有限公司 Intelligent control scheme for solving morning-evening frequent starting of photovoltaic grid-connected inverter

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CN101807850A (en) * 2010-04-23 2010-08-18 合肥日源电气信息技术有限公司;合肥阳光电源有限公司 Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter
CN102315764A (en) * 2011-09-16 2012-01-11 深圳创动科技有限公司 Control method for auxiliary power supply of photovoltaic inverter and device
CN102361402A (en) * 2011-10-21 2012-02-22 广州金升阳科技有限公司 Switching power supply circuit

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US5479333A (en) * 1994-04-25 1995-12-26 Chrysler Corporation Power supply start up booster circuit
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CN101807850A (en) * 2010-04-23 2010-08-18 合肥日源电气信息技术有限公司;合肥阳光电源有限公司 Circuit capable of avoiding repeatedly starting and stopping auxiliary power supply of photovoltaic inverter
CN102315764A (en) * 2011-09-16 2012-01-11 深圳创动科技有限公司 Control method for auxiliary power supply of photovoltaic inverter and device
CN102361402A (en) * 2011-10-21 2012-02-22 广州金升阳科技有限公司 Switching power supply circuit

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Publication number Priority date Publication date Assignee Title
CN104124698A (en) * 2013-04-25 2014-10-29 惠州天能源逆变技术有限公司 Intelligent control scheme for solving morning-evening frequent starting of photovoltaic grid-connected inverter
CN103956889A (en) * 2014-04-30 2014-07-30 瑞斯康达科技发展股份有限公司 Enable signal control circuit and power circuit

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