CN219039645U - Photovoltaic power optimizer start control circuit - Google Patents

Photovoltaic power optimizer start control circuit Download PDF

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CN219039645U
CN219039645U CN202223594612.7U CN202223594612U CN219039645U CN 219039645 U CN219039645 U CN 219039645U CN 202223594612 U CN202223594612 U CN 202223594612U CN 219039645 U CN219039645 U CN 219039645U
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power
resistor
terminal
circuit
control circuit
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王小洪
王树乐
张希
程远
朱博毓
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Chongqing Aspan Technology Co ltd
Chongqing Research Institute of Harbin Institute of Technology
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Chongqing Research Institute of Harbin Institute of Technology
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Abstract

The utility model relates to the technical field of photovoltaic power optimizers, and particularly discloses a photovoltaic power optimizer starting control circuit, which comprises a power supply circuit and a low-power control circuit connected with the power supply circuit, wherein the low-power control circuit is used for judging the power value of an input end and controlling the power supply circuit to be conducted when the power value exceeds a threshold power and not started when the power value is lower than the threshold power; the low-power control circuit comprises a primary amplifying circuit, a secondary amplifying circuit and a voltage dividing circuit which are sequentially connected with a signal input end of the control chip. The signal at the signal input end is amplified through the primary amplifying circuit and the secondary amplifying circuit, so that the accuracy of power value detection is improved; meanwhile, the power of the input end is detected by controlling the triode through the analog circuit, the effect that the power supply circuit is not started when the voltage is low is achieved, the situation that the voltage is too low to cause repeated restarting is avoided, and the service life of the controller is prolonged.

Description

光伏功率优化器启动控制电路Photovoltaic power optimizer start control circuit

技术领域technical field

本实用新型涉及光伏功率优化器技术领域,具体涉及光伏功率优化器启动控制电路。The utility model relates to the technical field of a photovoltaic power optimizer, in particular to a start-up control circuit of a photovoltaic power optimizer.

背景技术Background technique

光伏功率优化器主要应用于采用多个光伏组件串并联形式的光伏电站中。主要为了解决当电站内各组件间存在状态差异,或某些组件中出现遮挡或损伤时,造成逆变器在部分或全部组件统一进行最大功率点追踪时输出功率减少,导致效率低下的问题。因此在每个光伏组件内设置连接一个最大功率优化器,以提高输出功率。Photovoltaic power optimizers are mainly used in photovoltaic power plants that use multiple photovoltaic modules connected in series and parallel. It is mainly to solve the problem that when there is a state difference between the components in the power station, or some components are blocked or damaged, the output power of the inverter will be reduced when some or all components are uniformly tracked to the maximum power point, resulting in low efficiency. Therefore, a maximum power optimizer is installed in each photovoltaic module to increase the output power.

而在光伏功率优化器的使用过程中,我们发现当光伏板有遮挡或者早晚光照条件较弱的情况时,系统会造成电路反复重启的情况。而这种情况主要是因为由光伏板输入到光伏功率优化器板子上的供电电压不稳定,导致电压失控出现反复重启的情况。而电路反复重启会导致MCU芯片不断重启,从而导致芯片内部存储不断被擦写,而芯片的擦写次数是有次数寿命的,这就导致芯片使用寿命大幅降低,从而使整个控制器寿命降低。In the process of using the photovoltaic power optimizer, we found that when the photovoltaic panels are blocked or the light conditions are weak in the morning and evening, the system will cause the circuit to restart repeatedly. This situation is mainly because the power supply voltage input from the photovoltaic panel to the photovoltaic power optimizer board is unstable, resulting in repeated restarts of the voltage out of control. The repeated restart of the circuit will cause the MCU chip to restart continuously, resulting in the internal memory of the chip being continuously erased and written, and the number of erasing and writing of the chip has a lifespan, which leads to a significant reduction in the service life of the chip, thereby reducing the life of the entire controller.

因此,为了提高控制器的使用寿命,避免电路反复重启的问题,现在需要提供光伏功率优化器启动控制电路。Therefore, in order to improve the service life of the controller and avoid the problem of repeated restarts of the circuit, it is now necessary to provide a photovoltaic power optimizer start-up control circuit.

实用新型内容Utility model content

本实用新型意在提供光伏功率优化器启动控制电路,解决电路反复重启,降低芯片使用寿命的问题。The utility model intends to provide a start-up control circuit for a photovoltaic power optimizer, which solves the problem of repeated circuit restarts and reduced service life of chips.

为达到上述目的,本实用新型采用如下技术方案:In order to achieve the above object, the utility model adopts the following technical solutions:

本实用新型主要用于避免在光伏板有遮挡或早晚光照较弱时,造成电路反复重启的问题,从而提高控制芯片使用寿命,延长整个控制器使用寿命,提高使用效率,降低设备更换成本。具体为提供光伏功率优化器启动控制电路,包括电源电路,以及与电源电路连接的低功率控制电路,所述低功率控制电路用于判定输入的功率值,并控制所述电源电路在功率值超过阈值功率时导通,在功率值低于阈值功率时不启动;所述低功率控制电路包括与控制芯片的信号输入端依次连接的一级放大电路、二级放大电路和分压电路;所述一级放大电路包括与三极管Q2基极端连接的第一分压电阻;所述二级放大电路包括与三极管Q1集电极端连接的供电电阻,以及与三极管Q1基极端连接的偏置电阻,所述供电电阻和偏置电阻分别连接至电源端;所述分压电路包括第二分压电阻,与第二分压电阻分别连接的二极管阴极端和使能端,所述二极管阳极端连接输出端。The utility model is mainly used to avoid the problem of repeated restart of the circuit when the photovoltaic panel is blocked or the light is weak in the morning and evening, so as to improve the service life of the control chip, prolong the service life of the entire controller, improve the use efficiency, and reduce the cost of equipment replacement. Specifically, a photovoltaic power optimizer startup control circuit is provided, including a power supply circuit, and a low-power control circuit connected to the power supply circuit, the low-power control circuit is used to determine the input power value, and control the power supply circuit when the power value exceeds When the threshold power is turned on, it will not start when the power value is lower than the threshold power; the low power control circuit includes a primary amplifier circuit, a secondary amplifier circuit, and a voltage divider circuit that are sequentially connected to the signal input end of the control chip; The primary amplifier circuit includes a first voltage dividing resistor connected to the base terminal of the transistor Q2; the secondary amplifier circuit includes a power supply resistor connected to the collector terminal of the transistor Q1, and a bias resistor connected to the base terminal of the transistor Q1. The power supply resistor and the bias resistor are respectively connected to the power supply terminal; the voltage divider circuit includes a second voltage divider resistor, a diode cathode terminal and an enabling terminal respectively connected to the second voltage divider resistor, and the diode anode terminal is connected to the output terminal.

本方案的原理及优点是:The principle and advantages of this scheme are:

只有当功率值超过阈值功率时,电源端才会启动工作,使光伏功率优化器正常启动工作,从而保证在光伏板输出的供电电压较低或不稳定时不会启动优化器的控制芯片工作,从而避免反复重启的情况,保证控制芯片的使用寿命,从而提高控制器的使用寿命。Only when the power value exceeds the threshold power, the power supply terminal will start to work, so that the photovoltaic power optimizer can start to work normally, so as to ensure that the control chip of the optimizer will not be started to work when the power supply voltage output by the photovoltaic panel is low or unstable. In this way, repeated restarts are avoided, the service life of the control chip is ensured, and the service life of the controller is improved.

同时,通过一级放大电路和二级放大电路对信号输入端的信号进行放大,保证在不失真的情况下将信号尽可能的放大,以提高信号的精准度,进而提高对功率值检测的准确性,有效提高检测效率。同时采用对输出的功率值进行检测,保证检测数据的稳定性,进一步提高判定精准度。并且通过三极管开关的特性控制导通或关闭电源电路,达到自动化控制在低功率不启动的效果。At the same time, the signal at the signal input terminal is amplified through the primary amplifier circuit and the secondary amplifier circuit to ensure that the signal is amplified as much as possible without distortion, so as to improve the accuracy of the signal, thereby improving the accuracy of power value detection , effectively improving the detection efficiency. At the same time, the output power value is detected to ensure the stability of the detection data and further improve the judgment accuracy. And through the characteristics of the triode switch, the power supply circuit is turned on or off, so as to achieve the effect of automatic control without starting at low power.

进一步的,所述供电电阻包括分别与三极管Q1集电极端并联连接的电阻R7和电阻R6;所述电阻R7和电阻R6的电阻值为100Ω。选用功率电阻值在100Ω附近的电阻,提高供电电阻部分的消耗功率,从而降低电源端的电压,保证输出电压小于阈值电压,避免误启动的情况,进而减少反复重启的情况。Further, the power supply resistor includes a resistor R7 and a resistor R6 respectively connected in parallel with the collector terminal of the triode Q1; the resistance value of the resistor R7 and the resistor R6 is 100Ω. Choose a resistor with a power resistance value around 100Ω to increase the power consumption of the power supply resistor, thereby reducing the voltage at the power supply terminal, ensuring that the output voltage is lower than the threshold voltage, avoiding false starts, and reducing repeated restarts.

进一步的,所述偏置电阻包括分别与三极管Q1基极端并联连接的电阻R8和电阻R9;所述电阻R8和电阻R9的电阻值大于10KΩ。选用功率电阻值在10KΩ以上的电阻,保证在正常工作时,偏置电阻的消耗功率极小,确保电阻不会影响电压的正常输出,确保工作时输出电压的稳定性,防止在工作状态时电压变化过低出现不断重启的情况。Further, the bias resistor includes a resistor R8 and a resistor R9 respectively connected in parallel with the base terminal of the triode Q1; the resistance values of the resistor R8 and the resistor R9 are greater than 10KΩ. Select a resistor with a power resistance value above 10KΩ to ensure that the power consumption of the bias resistor is extremely small during normal operation, to ensure that the resistance will not affect the normal output of the voltage, to ensure the stability of the output voltage during operation, and to prevent the overvoltage during operation. If the change is too low, there will be continuous restarts.

进一步的,所述第一分压电阻包括依次与信号输入端连接的电阻R10和电阻R12;所述电阻R12一端与所述三极管Q2基极端连接;所述电阻R12另一端与所述三极管Q2发射极端连接。Further, the first voltage dividing resistor includes a resistor R10 and a resistor R12 sequentially connected to the signal input terminal; one end of the resistor R12 is connected to the base terminal of the transistor Q2; the other end of the resistor R12 is connected to the transistor Q2 to transmit Extreme connection.

进一步的,所述三极管Q2集电极端分别连接三极管Q1基极端、电阻R8一端和电阻R9一端;所述电阻R8另一端分别连接电阻R9另一端、电阻R6另一端、电阻R7另一端、电源端;所述三极管Q2发射极端与三极管Q1发射极端连接;所述三极管Q1发射极端接地。Further, the collector terminal of the triode Q2 is respectively connected to the base terminal of the triode Q1, one end of the resistor R8 and one end of the resistor R9; the other end of the resistor R8 is connected to the other end of the resistor R9, the other end of the resistor R6, the other end of the resistor R7, and the power supply terminal ; The emitter end of the transistor Q2 is connected to the emitter end of the transistor Q1; the emitter end of the transistor Q1 is grounded.

进一步的,所述第二分压电阻包括依次与电阻R7另一端连接的电阻R5和电阻R11;所述电阻R5另一端分别连接二极管D1阴极端以及使能端;所述二极管D1阳极端连接电源端;所述电阻R11另一端分别连接电容C5一端并接地;所述电容C5另一端连接二极管D1阴极端。在启动后通过二极管D1连接使能端,有效避免电源电路在工作过程中因为低电压不断重启的异常情况,保证电源电路的稳定输出,有效提高控制器的使用寿命。Further, the second voltage dividing resistor includes a resistor R5 and a resistor R11 sequentially connected to the other end of the resistor R7; the other end of the resistor R5 is respectively connected to the cathode end of the diode D1 and the enabling end; the anode end of the diode D1 is connected to the power supply terminal; the other terminal of the resistor R11 is respectively connected to one terminal of the capacitor C5 and grounded; the other terminal of the capacitor C5 is connected to the cathode terminal of the diode D1. After starting, the diode D1 is connected to the enable terminal, which can effectively avoid the abnormal situation that the power circuit restarts continuously due to low voltage during the working process, ensure the stable output of the power circuit, and effectively improve the service life of the controller.

进一步的,所述电源电路为12V转3.3V DC-DC电源电路;所述电源电路包括电源芯片,以及与电源芯片使能引脚分别连接的电阻R1一端、电阻R4一端以及使能端;所述电阻R1另一端分别连接电源端和电源芯片输入引脚;所述电源芯片引脚6依次连接电感L1和输出端。Further, the power supply circuit is a 12V to 3.3V DC-DC power supply circuit; the power supply circuit includes a power supply chip, and one end of the resistor R1, one end of the resistor R4, and an enabling terminal respectively connected to the enable pin of the power chip; The other end of the resistor R1 is respectively connected to the power supply terminal and the input pin of the power chip; the pin 6 of the power chip is connected to the inductor L1 and the output terminal in turn.

进一步的,所述电源芯片引脚1连接有电容C1一端,电容C1另一端与电感L1一端连接。Further, one end of the capacitor C1 is connected to the pin 1 of the power chip, and the other end of the capacitor C1 is connected to one end of the inductor L1.

进一步的,所述电源芯片引脚3分别连接电阻R3一端和电阻R2一端;所述电阻R2另一端分别连接电感L1另一端、电容C3一端和电源端。Further, the pins 3 of the power chip are respectively connected to one end of the resistor R3 and one end of the resistor R2; the other end of the resistor R2 is respectively connected to the other end of the inductor L1, one end of the capacitor C3 and the power supply end.

进一步的,所述电阻R4另一端分别连接电源芯片引脚2、电阻R3另一端以及电容C3另一端;所述电源芯片引脚2接地。Further, the other end of the resistor R4 is respectively connected to the pin 2 of the power chip, the other end of the resistor R3 and the other end of the capacitor C3; the pin 2 of the power chip is grounded.

附图说明Description of drawings

图1本实用新型实施例的结构示意图;Fig. 1 is the structural representation of the utility model embodiment;

图2为本实用新型实施例的低功率控制单元电路图;Fig. 2 is the circuit diagram of the low power control unit of the utility model embodiment;

图3为本实用新型实施例的电源单元电路图。Fig. 3 is a circuit diagram of a power supply unit according to an embodiment of the present invention.

具体实施方式Detailed ways

下面通过具体实施方式进一步详细说明:The following is further described in detail through specific implementation methods:

说明书附图中的附图标记包括:控制芯片1、低功率控制电路2、电源电路3。The reference signs in the drawings of the specification include: control chip 1 , low power control circuit 2 , power supply circuit 3 .

实施例基本如附图1所示:光伏功率优化器启动控制电路,用于精确判定由光伏板输出至光伏功率优化器的输入功率,确保在输入功率过低时,控制不启动优化器中工作电路,从而避免电路反复重启的情况,有效提高优化器控制芯片1的使用寿命,从而提升控制器的使用寿命。具体包括与控制芯片1(MCU)通过信号输入端Signal1连接的低功率控制电路2,以及与低功率控制电路2连接的电源电路3。本实施例中,控制芯片1(MCU)采用GD32F310K8T6(兆易)芯片。The embodiment is basically shown in Figure 1: the photovoltaic power optimizer startup control circuit is used to accurately determine the input power output from the photovoltaic panel to the photovoltaic power optimizer, to ensure that when the input power is too low, the control does not start the work in the optimizer circuit, so as to avoid the repeated restart of the circuit, effectively improve the service life of the optimizer control chip 1, thereby increasing the service life of the controller. Specifically, it includes a low-power control circuit 2 connected to a control chip 1 (MCU) through a signal input terminal Signal1, and a power supply circuit 3 connected to the low-power control circuit 2 . In this embodiment, the control chip 1 (MCU) adopts GD32F310K8T6 (Gigayi) chip.

具体的,如附图2所示,所述低功率控制电路2用于判定信号输入端输入的功率是否超过阈值功率,并在超过阈值功率后导通使能端启动电源电路3,使其工作;若未超过阈值功率则不启动电源电路3。相较于对电路中的电压进行判定,判定功率值更稳定精准,从而更能保证在小范围内对低功率判定的准确性,保证判定的精准度。具体的,所述低功率控制电路2包括与控制芯片1信号输入端Signal1连接的电阻R10一端,电阻R10另一端分别连接电阻R12一端和三极管Q2基极端;所述电阻R12另一端与三极管Q2发射极端连接。Specifically, as shown in Figure 2, the low power control circuit 2 is used to determine whether the power input by the signal input terminal exceeds the threshold power, and after the threshold power is exceeded, the enabling terminal is turned on to start the power supply circuit 3 to make it work ; If the threshold power is not exceeded, the power supply circuit 3 is not started. Compared with judging the voltage in the circuit, judging the power value is more stable and accurate, so that it can better ensure the accuracy of judging low power in a small range and ensure the accuracy of judging. Specifically, the low-power control circuit 2 includes one end of a resistor R10 connected to the signal input terminal Signal1 of the control chip 1, and the other end of the resistor R10 is respectively connected to one end of the resistor R12 and the base end of the transistor Q2; the other end of the resistor R12 is connected to the transistor Q2. Extreme connection.

所述三极管Q2集电极端分别连接三极管Q1基极端、电阻R8一端和电阻R9一端。本实施例中,电阻R8和电阻R9选用功率阻值在10KΩ以上的,其工作时消耗功率极小,可保证在电路工作时消耗的功率降至最低,从而不影响电路电压,避免电压降低导致电路不稳定造成不断重启的情况,同时有效降低正常工作时的能耗。所述三极管Q1集电极端分别连接电阻R7一端和电阻R6一端,所述电阻R7另一端分别连接电阻R6另一端、电阻R8另一端、电阻R9另一端、电源端VCC以及电阻R5一端;所述三极管Q1发射极端与所述三极管Q2发射极端连接。本实施例中,电阻R6和电阻R7选用功率阻值在100Ω附近的电阻,其功率消耗较大,在对电路中输出功率进行处理判定时,可有效降低输出功率值,从而保证较低功率低于阈值功率,确保精准控制使能端不导通,从而精准控制电源电路3在较低功率时不启动,减少低功率情况下反复启动的情况,也保证当启动工作时能够为电源电路3提供充足稳定的输出功率。The collector terminal of the triode Q2 is respectively connected to the base terminal of the triode Q1, one end of the resistor R8 and one end of the resistor R9. In this embodiment, resistors R8 and R9 are selected with a power resistance value above 10KΩ, which consumes very little power during operation, which can ensure that the power consumed during circuit operation is minimized, thereby not affecting the circuit voltage and avoiding voltage drop. Circuit instability causes constant restarts, while effectively reducing energy consumption during normal operation. The collector terminal of the triode Q1 is respectively connected to one end of the resistor R7 and one end of the resistor R6, and the other end of the resistor R7 is respectively connected to the other end of the resistor R6, the other end of the resistor R8, the other end of the resistor R9, the power supply terminal VCC and one end of the resistor R5; The emitter end of the transistor Q1 is connected to the emitter end of the transistor Q2. In this embodiment, resistors R6 and R7 use resistors with a power resistance around 100Ω, and their power consumption is large. When processing and judging the output power in the circuit, the output power value can be effectively reduced, thereby ensuring low power and low Threshold power, to ensure that the precise control enable terminal is not turned on, so as to precisely control the power supply circuit 3 not to start at low power, reduce the situation of repeated startup under low power conditions, and also ensure that the power supply circuit 3 can be provided when starting work Sufficient and stable output power.

所述电阻R5另一端分别连接电阻R11一端、电容C5一端、二极管D1阴极端以及使能端3.3V_EN。所述电阻R11另一端与所述电容C5另一端以及三极管Q1发射极端连接;所述三极管Q1发射极端接地。所述二极管D1阳极端连接输出端3.3V;所述使能端3.3V_EN为输出功率与阈值功率的判定节点,本实施例中阈值功率为1.3W。只有当输出功率超过阈值功率时,电源电路3才会启动,从而保证工作状态时功率的稳定性,避免反复重启的情况。The other end of the resistor R5 is respectively connected to one end of the resistor R11, one end of the capacitor C5, the cathode end of the diode D1 and the enable end 3.3V_EN. The other end of the resistor R11 is connected to the other end of the capacitor C5 and the emitter end of the transistor Q1; the emitter end of the transistor Q1 is grounded. The anode of the diode D1 is connected to the output terminal 3.3V; the enable terminal 3.3V_EN is a judgment node between the output power and the threshold power, and the threshold power in this embodiment is 1.3W. Only when the output power exceeds the threshold power, the power supply circuit 3 will start, so as to ensure the stability of the power in the working state and avoid repeated restarts.

具体的,如附图3所示,所述电源电路3为12V转3.3V DC-DC(直流电路中将一个电压值的电能变为另一个电压值的电能)电源电路,本实施例中为将光伏功率优化器的12V电压网络转换为3.3V电压网络。所述电源电路3包括电源芯片U1,本实施例中,电源芯片U1为电源DCDC芯片,采用ETA2845S2G(钰泰)芯片。以及与电源芯片U1使能引脚4(EN)分别连接的电阻R1一端、电阻R4一端以及使能端3.3V_EN;电源芯片U1使能引脚4为电源芯片U1激活引脚,只有当使能端3.3V_EN处的功率超过阈值功率1.3W后,才会将该管脚激活,从而使电源芯片U1工作,才会有电源输出。同时在使能引脚4的外围设计低功率控制电路2,实现电源芯片U1多种上电功能,从而保证在功率较低时,电源电路3不启动,同时不会影响电源芯片U1的正常工作,极大提升电源芯片U1使用效率,节省电源能耗,延长电源芯片的使用寿命,从而提高整个控制器电源使用寿命。所述电阻R1另一端分别连接电源端VCC和电源芯片U1输入引脚5(IN);所述电阻R4另一端与电源芯片U1引脚2(GND)连接,所述电源芯片U1引脚2接地,保证电路稳定安全。Concretely, as shown in accompanying drawing 3, described power supply circuit 3 is 12V to 3.3V DC-DC (the electric energy of one voltage value is changed into the electric energy of another voltage value in the DC circuit) power supply circuit, in the present embodiment is Convert the 12V voltage network of the photovoltaic power optimizer to a 3.3V voltage network. The power supply circuit 3 includes a power supply chip U1. In this embodiment, the power supply chip U1 is a power supply DCDC chip, which adopts an ETA2845S2G (Yutai) chip. And one end of resistor R1, one end of resistor R4 and the enable terminal 3.3V_EN respectively connected to the enable pin 4 (EN) of the power chip U1; the enable pin 4 of the power chip U1 is the activation pin of the power chip U1. After the power at terminal 3.3V_EN exceeds the threshold power of 1.3W, the pin will be activated, so that the power chip U1 will work, and then there will be power output. At the same time, a low-power control circuit 2 is designed around the enable pin 4 to realize various power-on functions of the power chip U1, so as to ensure that the power circuit 3 does not start when the power is low, and at the same time it will not affect the normal operation of the power chip U1 , greatly improve the efficiency of the power supply chip U1, save power consumption, prolong the service life of the power chip, thereby improving the service life of the entire controller power supply. The other end of the resistor R1 is respectively connected to the power supply terminal VCC and the input pin 5 (IN) of the power chip U1; the other end of the resistor R4 is connected to the pin 2 (GND) of the power chip U1, and the pin 2 of the power chip U1 is grounded , to ensure the stability and safety of the circuit.

具体的,所述电源芯片U1引脚6(LX)分别连接电容C1一端和电感L1一端;所述电容C1另一端连接电源芯片U1引脚1;所述电感L1另一端分别连接电阻R2一端、电容C3一端和输出端3.3V。在输出功率超过阈值功率后,电源电路3将12V电压值转换为满足工作要求的3.3V电压并输出,转化效率高,且避免工作时电压不稳定反复重启的情况,同时保证输出电压的精度,满足电路工作需要。Specifically, the pin 6 (LX) of the power chip U1 is respectively connected to one end of the capacitor C1 and one end of the inductor L1; the other end of the capacitor C1 is connected to the pin 1 of the power chip U1; the other end of the inductor L1 is respectively connected to one end of the resistor R2, One end of capacitor C3 and the output end 3.3V. After the output power exceeds the threshold power, the power supply circuit 3 converts the 12V voltage value into a 3.3V voltage that meets the working requirements and outputs it. The conversion efficiency is high, and the repeated restart of the voltage is avoided during operation, while ensuring the accuracy of the output voltage. Meet the needs of circuit work.

具体的,所述电源芯片U1引脚3(FB)分别连接电阻R3一端和电阻R2一端;所述电阻R3另一端与电源芯片U1引脚2连接。所述电阻R2另一端分别与电感L1另一端和电容C3一端连接;所述电容C3另一端与所述电阻R3另一端连接。Specifically, the pin 3 (FB) of the power chip U1 is respectively connected to one end of the resistor R3 and one end of the resistor R2; the other end of the resistor R3 is connected to the pin 2 of the power chip U1. The other end of the resistor R2 is respectively connected to the other end of the inductor L1 and one end of the capacitor C3; the other end of the capacitor C3 is connected to the other end of the resistor R3.

具体实施过程如下:The specific implementation process is as follows:

如附图1至附图3所示,当通过光伏板输出至优化器中的功率为0或较低时,优化器的控制芯片1通过信号输入端Signal1接收的功率就为0或较低,此时三极管Q2基极为低,三极管Q2工作在截止状态,三极管Q1工作在饱和状态,此时电流经过电阻R6和电阻R7会消耗一定的功率,电源端VCC通过电阻R5和电阻R11分压后电压降低。当输出功率较低时,电源端VCC电压降低,使能端3.3V_EN处的功率便低于阈值功率,从而控制使能端3.3V_EN不导通,从而使电源电路3不启动工作。而当输入功率足够大时,电源端VCC的电压升高,通过电阻R5和电阻R11分压后的电压也随之升高,此时使能端3.3V_EN处的功率超过阈值功率,使能端3.3V_EN导通,使输出端3.3V正常输出工作,进而控制电源电路3启动正常工作。As shown in accompanying drawings 1 to 3, when the power output to the optimizer through the photovoltaic panel is 0 or lower, the power received by the control chip 1 of the optimizer through the signal input terminal Signal1 is 0 or lower, At this time, the base of the transistor Q2 is extremely low, the transistor Q2 works in the cut-off state, and the transistor Q1 works in the saturated state. At this time, the current passing through the resistor R6 and the resistor R7 will consume a certain amount of power. reduce. When the output power is low, the voltage of the power supply terminal VCC decreases, and the power at the enable terminal 3.3V_EN is lower than the threshold power, thereby controlling the enable terminal 3.3V_EN to be non-conductive, so that the power supply circuit 3 does not start to work. When the input power is large enough, the voltage of the power supply terminal VCC increases, and the voltage divided by the resistor R5 and the resistor R11 also increases accordingly. At this time, the power at the enable terminal 3.3V_EN exceeds the threshold power, and the enable terminal 3.3V_EN is turned on, so that the output terminal 3.3V can output normally, and then control the power supply circuit 3 to start to work normally.

此时,当输出端3.3V正常输出后,控制芯片1输入引脚Signal1信号为高,三极管Q2为饱和状态导通,三极管Q1工作在截止状态,电阻R6和电阻R7停止工作,电阻R8和电阻R9正常工作,输出端3.3V通过二极管D1直接连接至使能端3.3V_EN,避免工作时回流,确保使能端3.3V_EN功率稳定性,有效避免电源电路3反复重启。At this time, when the output terminal 3.3V is normally output, the signal of the input pin Signal1 of the control chip 1 is high, the triode Q2 is turned on in the saturated state, the triode Q1 works in the cut-off state, the resistor R6 and the resistor R7 stop working, the resistor R8 and the resistor R9 works normally, and the output terminal 3.3V is directly connected to the enable terminal 3.3V_EN through the diode D1 to avoid backflow during operation, ensure the power stability of the enable terminal 3.3V_EN, and effectively prevent the power circuit 3 from restarting repeatedly.

本实施例中,通过模拟电路控制三极管检测输入端的功率,从而通过控制电源芯片U1使能引脚导通状态控制电源电路3的工作状态,达到电源电路3在低功率时不启动的效果,进而达到控制优化器控制芯片不启动的效果。有效减少当光伏板有遮挡或光照不足时,导致输出功率过低或为0时,电路反复重启的异常情况。使光伏功率优化器12V的电压网络,带着50Ω的负载还能将电压稳定在7.62V的时候,保证电源芯片U1使能引脚输入端功率不低于阈值功率时,才会启动光伏功率优化器正常工作,从而保证工作时功率的稳定,避免功率过低造成反复重启的情况,有效提高使用效率,从而避免优化器的控制芯片1不断被无效重启擦写,有效延长控制芯片1的使用寿命,同时延长控制器的使用寿命。In this embodiment, the power of the triode detection input terminal is controlled by the analog circuit, thereby controlling the working state of the power supply circuit 3 by controlling the conduction state of the enable pin of the power supply chip U1, so as to achieve the effect that the power supply circuit 3 does not start when the power is low, and then To achieve the effect of controlling the optimizer to control the chip not to start. Effectively reduce the abnormal situation that the circuit restarts repeatedly when the output power is too low or 0 when the photovoltaic panel is blocked or the light is insufficient. When the 12V voltage network of the photovoltaic power optimizer can stabilize the voltage at 7.62V with a 50Ω load, the photovoltaic power optimization will only be started when the power at the input terminal of the enable pin of the power chip U1 is not lower than the threshold power The normal operation of the optimizer ensures the stability of the power during operation, avoids repeated restarts caused by too low power, and effectively improves the use efficiency, thereby preventing the control chip 1 of the optimizer from being continuously erased by invalid restarts and effectively prolonging the service life of the control chip 1 , while prolonging the service life of the controller.

以上所述的仅是本实用新型的实施例,方案中公知的具体技术方案和/或特性等常识在此未作过多描述。应当指出,对于本领域的技术人员来说,在不脱离本实用新型技术方案的前提下,还可以作出若干变形和改进,这些也应该视为本实用新型的保护范围,这些都不会影响本实用新型实施的效果和专利的实用性。本申请要求的保护范围应当以其权利要求的内容为准,说明书中的具体实施方式等记载可以用于解释权利要求的内容。What is described above is only the embodiment of the utility model, and the specific technical solutions and/or characteristics and other general knowledge known in the solutions are not described here too much. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, some modifications and improvements can also be made, and these should also be regarded as the protection scope of the utility model, and these will not affect the utility model. Effects of utility model implementation and practicability of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (10)

1.光伏功率优化器启动控制电路,其特征在于:包括电源电路,以及与电源电路连接的低功率控制电路,所述低功率控制电路用于判定输入的功率值,并控制所述电源电路在功率值超过阈值功率时导通,在功率值低于阈值功率时不启动;所述低功率控制电路包括与控制芯片的信号输入端依次连接的一级放大电路、二级放大电路和分压电路;所述一级放大电路包括与三极管Q2基极端连接的第一分压电阻;所述二级放大电路包括与三极管Q1集电极端连接的供电电阻,以及与三极管Q1基极端连接的偏置电阻,所述供电电阻和偏置电阻分别连接至电源端;所述分压电路包括第二分压电阻,与第二分压电阻分别连接的二极管阴极端和使能端,所述二极管阳极端连接输出端。1. Photovoltaic power optimizer start-up control circuit, it is characterized in that: comprise power circuit, and the low power control circuit that is connected with power circuit, described low power control circuit is used for judging the power value of input, and controls described power circuit in Conducting when the power value exceeds the threshold power, and not starting when the power value is lower than the threshold power; the low power control circuit includes a primary amplifier circuit, a secondary amplifier circuit, and a voltage divider circuit sequentially connected to the signal input terminal of the control chip ; The primary amplifier circuit includes a first voltage dividing resistor connected to the base terminal of the transistor Q2; the secondary amplifier circuit includes a power supply resistor connected to the collector terminal of the transistor Q1, and a bias resistor connected to the base terminal of the transistor Q1 , the power supply resistor and the bias resistor are respectively connected to the power supply terminal; the voltage divider circuit includes a second voltage divider resistor, a diode cathode terminal and an enabling terminal respectively connected to the second voltage divider resistor, and the diode anode terminal is connected to output. 2.根据权利要求1所述的光伏功率优化器启动控制电路,其特征在于:所述供电电阻包括分别与三极管Q1集电极端并联连接的电阻R7和电阻R6;所述电阻R7和电阻R6的电阻值为100Ω。2. The start-up control circuit of photovoltaic power optimizer according to claim 1, characterized in that: the power supply resistance comprises resistance R7 and resistance R6 connected in parallel with the collector terminal of triode Q1 respectively; The resistance value is 100Ω. 3.根据权利要求2所述的光伏功率优化器启动控制电路,其特征在于:所述偏置电阻包括分别与三极管Q1基极端并联连接的电阻R8和电阻R9;所述电阻R8和电阻R9的电阻值大于10KΩ。3. The photovoltaic power optimizer startup control circuit according to claim 2, characterized in that: the bias resistors include resistors R8 and R9 connected in parallel with the base terminals of the triode Q1 respectively; The resistance value is greater than 10KΩ. 4.根据权利要求1所述的光伏功率优化器启动控制电路,其特征在于:所述第一分压电阻包括依次与信号输入端连接的电阻R10和电阻R12;所述电阻R12一端与所述三极管Q2基极端连接;所述电阻R12另一端与所述三极管Q2发射极端连接。4. The start-up control circuit of photovoltaic power optimizer according to claim 1, characterized in that: the first voltage dividing resistor comprises a resistor R10 and a resistor R12 which are sequentially connected to the signal input end; one end of the resistor R12 is connected to the The base terminal of the transistor Q2 is connected; the other end of the resistor R12 is connected with the emitter terminal of the transistor Q2. 5.根据权利要求3所述的光伏功率优化器启动控制电路,其特征在于:所述三极管Q2集电极端分别连接三极管Q1基极端、电阻R8一端和电阻R9一端;所述电阻R8另一端分别连接电阻R9另一端、电阻R6另一端、电阻R7另一端、电源端;所述三极管Q2发射极端与三极管Q1发射极端连接;所述三极管Q1发射极端接地。5. The photovoltaic power optimizer startup control circuit according to claim 3, characterized in that: the collector terminal of the triode Q2 is respectively connected to the base terminal of the triode Q1, one end of the resistor R8 and one end of the resistor R9; the other end of the resistor R8 is respectively Connect the other end of the resistor R9, the other end of the resistor R6, the other end of the resistor R7, and the power supply; the emitter end of the transistor Q2 is connected to the emitter end of the transistor Q1; the emitter end of the transistor Q1 is grounded. 6.根据权利要求2所述的光伏功率优化器启动控制电路,其特征在于:所述第二分压电阻包括依次与电阻R7另一端连接的电阻R5和电阻R11;所述电阻R5另一端分别连接二极管D1阴极端以及使能端;所述二极管D1阳极端连接电源端;所述电阻R11另一端分别连接电容C5一端并接地;所述电容C5另一端连接二极管D1阴极端。6. The photovoltaic power optimizer startup control circuit according to claim 2, characterized in that: the second voltage dividing resistor includes resistor R5 and resistor R11 connected to the other end of resistor R7 in sequence; the other end of resistor R5 is respectively Connect the cathode terminal of the diode D1 and the enabling terminal; the anode terminal of the diode D1 is connected to the power supply terminal; the other terminal of the resistor R11 is respectively connected to one terminal of the capacitor C5 and grounded; the other terminal of the capacitor C5 is connected to the cathode terminal of the diode D1. 7.根据权利要求1所述的光伏功率优化器启动控制电路,其特征在于:所述电源电路为12V转3.3V DC-DC电源电路;所述电源电路包括电源芯片,以及与电源芯片使能引脚分别连接的电阻R1一端、电阻R4一端以及使能端;所述电阻R1另一端分别连接电源端和电源芯片输入引脚;所述电源芯片引脚6依次连接电感L1和输出端。7. The photovoltaic power optimizer startup control circuit according to claim 1, characterized in that: the power circuit is a 12V to 3.3V DC-DC power circuit; the power circuit includes a power chip, and is enabled with the power chip The pins are respectively connected to one end of the resistor R1, one end of the resistor R4 and the enable end; the other end of the resistor R1 is respectively connected to the power supply terminal and the input pin of the power chip; the pin 6 of the power chip is connected to the inductor L1 and the output terminal in turn. 8.根据权利要求7所述的光伏功率优化器启动控制电路,其特征在于:所述电源芯片引脚1连接有电容C1一端,电容C1另一端与电感L1一端连接。8 . The start-up control circuit of the photovoltaic power optimizer according to claim 7 , wherein the pin 1 of the power chip is connected to one end of a capacitor C1 , and the other end of the capacitor C1 is connected to one end of an inductor L1 . 9.根据权利要求8所述的光伏功率优化器启动控制电路,其特征在于:所述电源芯片引脚3分别连接电阻R3一端和电阻R2一端;所述电阻R2另一端分别连接电感L1另一端、电容C3一端和电源端。9. The start-up control circuit of the photovoltaic power optimizer according to claim 8, characterized in that: the pins 3 of the power chip are respectively connected to one end of the resistor R3 and one end of the resistor R2; the other end of the resistor R2 is respectively connected to the other end of the inductor L1 , one end of capacitor C3 and the power supply end. 10.根据权利要求9所述的光伏功率优化器启动控制电路,其特征在于:所述电阻R4另一端分别连接电源芯片引脚2、电阻R3另一端以及电容C3另一端;所述电源芯片引脚2接地。10. The photovoltaic power optimizer startup control circuit according to claim 9, characterized in that: the other end of the resistor R4 is respectively connected to the power chip pin 2, the other end of the resistor R3 and the other end of the capacitor C3; Pin 2 is grounded.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116231595A (en) * 2022-12-30 2023-06-06 重庆阿斯潘科技有限公司 A low-voltage protection method for a photovoltaic optimizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116231595A (en) * 2022-12-30 2023-06-06 重庆阿斯潘科技有限公司 A low-voltage protection method for a photovoltaic optimizer

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