WO2019148460A1 - Charging apparatus and charging correction method - Google Patents

Charging apparatus and charging correction method Download PDF

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Publication number
WO2019148460A1
WO2019148460A1 PCT/CN2018/075157 CN2018075157W WO2019148460A1 WO 2019148460 A1 WO2019148460 A1 WO 2019148460A1 CN 2018075157 W CN2018075157 W CN 2018075157W WO 2019148460 A1 WO2019148460 A1 WO 2019148460A1
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Prior art keywords
current
charging
reference voltage
unit
voltage
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PCT/CN2018/075157
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French (fr)
Chinese (zh)
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郭启明
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深圳市柔宇科技有限公司
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Priority to CN201880086749.9A priority Critical patent/CN111602310A/en
Priority to PCT/CN2018/075157 priority patent/WO2019148460A1/en
Publication of WO2019148460A1 publication Critical patent/WO2019148460A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present invention relates to a charging technology, and in particular to a charging device capable of accurately adjusting a charging current and a correction method.
  • the usual solution for performing fast charging is to increase the charging current.
  • the charging adapter, the charging cable, and the electronic device to be charged will also be subjected to a corresponding increase in voltage during charging.
  • the charging device in order to ensure charging safety, the charging device generally performs voltage detection on the output charging current, that is, determines whether the power output by the charging device is within a preset range by detecting the output voltage in real time.
  • the charging current needs to be amplified after the current real-time output is detected.
  • the charging current after processing is deviated, resulting in an inaccurate charging current.
  • the preset range is reached, that is, the charging current cannot be accurately controlled.
  • the embodiment of the invention discloses a charging device capable of correcting the output charging current more accurately.
  • the invention discloses a charging correction method of the foregoing charging device.
  • a charging device includes a power output interface, a feedback reference comparison unit, a feedback control unit, a switch control unit, and a feedback adjustment unit.
  • the power output interface includes a power pin and a ground pin for outputting a charging current and a charging voltage.
  • the feedback reference comparison unit is electrically connected to the power pin for comparing and comparing the difference between the detection voltage corresponding to the charging current and the reference voltage and obtaining a difference amplification signal.
  • the feedback control unit is electrically connected to the feedback reference comparison unit for outputting a feedback adjustment signal according to the difference amplification signal.
  • the switch control unit is electrically connected to the power input terminal, the voltage pin and the feedback control unit.
  • the switch control unit is configured to receive a DC power source from a power input terminal and convert a first current in the DC power source into a charge current output to the power pin, and adjust the charging current according to the feedback adjustment signal.
  • the feedback adjustment unit stores a plurality of set current ranges and the reference voltage corresponding to each set current range, and the feedback adjustment unit determines whether the charging current and the current set current range match each other when When the charging current does not match the current set current range, re-acquiring the pre-stored reference voltage to adjust the reference voltage to control the difference amplification signal and the feedback adjustment signal correspondingly adjusted until the charging current is The current set current range matches.
  • a charging correction method comprising:
  • the reference voltage can be adjusted in real time according to the current actual output charging current of the power supply terminal, so that the reference voltage can be offset by the reference voltage in the feedback reference comparison unit, and the charging current is ensured due to the disturbance of the input bias voltage. It can be accurately located within the set current range, and at the same time, it is not necessary to specifically limit the bias voltage of the first amplifier in order to reduce the influence of the disturbance of the bias voltage, thereby reducing the cost of the first amplifier.
  • 1 is a schematic diagram showing the circuit structure of a charging device.
  • FIG. 2 is a flow chart of a charging correction method performed by the charging device shown in FIG. 1.
  • the charging device 10 is configured to convert an alternating current power source into a direct current power source and transmit it to an electronic device (not shown) through a charging cable (not shown) to charge the electronic device.
  • the DC power supply includes a charging voltage and a charging current.
  • the charging device 10 includes a charging input terminal 101, a conversion processing circuit 102, a power output interface 103, and a correction circuit 104.
  • the charging input terminal 101 is electrically connected to the AC power source to receive the AC power signal, and the conversion circuit 102 is electrically connected between the charging input terminal 101 and the power output interface 103 for converting the AC signal into a DC signal.
  • the direct current signal includes a first current.
  • the power output interface 103 of the charging device 10 is a USB charging interface, including a power pin Vbus, a ground pin G1, a first data pin D1 and a second data pin D2, and a power pin Vbus and ground.
  • the pin G1 is used for transmitting the charging voltage and the charging current IL
  • the first data pin D1 and the second data pin D2 are used for transmitting the data signal.
  • the correction circuit 104 is electrically connected to the conversion processing circuit 102 through the power input terminal UI and electrically connected to the voltage pin Vbus through the power output terminal UO for correcting the charging current in the DC power supply outputted by the conversion processing circuit to obtain the self-power output.
  • the charging current output by the interface 103 is within a set current range.
  • the correction circuit includes a detection unit 11, a feedback reference comparison unit 12, a feedback control unit 13, a switch control unit 14, and a feedback adjustment unit 15.
  • the detecting unit 11 is electrically connected to the power output terminal UO for converting the charging current IL into the detecting voltage Vis.
  • the feedback reference comparison unit 12 is electrically connected to the detection unit 11 for comparing and amplifying the detection voltage Vis with the reference voltage V REF and obtaining an amplified signal of the difference.
  • the feedback control unit 13 is electrically connected to the feedback reference comparison unit 12 for outputting a feedback adjustment signal according to the difference amplification signal.
  • the switch control unit 14 is electrically connected to the power input terminal UI, the power output terminal UO, and the feedback control unit 13.
  • the switch control unit 14 receives a DC power source from the power input terminal UI, and the first current in the DC power source is converted into a charging current output to the power output terminal UO of the power pin Vbus, and according to the self-feedback control unit 13
  • the received feedback adjustment signal adjusts the charging current and causes the adjusted charging current to be within a set current range.
  • the feedback adjustment unit 15 is electrically connected to the detection unit 11 and the feedback reference comparison unit 12.
  • the feedback adjustment unit 15 pre-stores a plurality of set current ranges and their corresponding reference voltages, and can receive an external operation command to set a current set current demand range.
  • the feedback adjusting unit 15 determines whether the charging current IL and the current set current range match each other.
  • the feedback adjusting unit 15 adjusts the currently used reference voltage V REF to control the difference amplification signal and the feedback adjustment signal correspondingly adjusted until the charging The current IL matches the current set current range.
  • the detecting unit 11 includes a detecting input terminal 111, a first detecting resistor RL, a second detecting resistor Ris, and a detecting output terminal 112.
  • the detection input terminal 111 is electrically connected to the power output terminal UO.
  • the first detection resistor RL is electrically connected to the power input terminal UI and the detection output terminal 112.
  • the second detection resistor Ris is electrically connected to the detection output terminal 112 and the ground terminal GND. between.
  • the feedback reference comparison unit 12 includes a first amplifying unit 121 for forwardly amplifying the detection voltage Vis, and a second amplifying unit 122 for using the enlarged unit
  • the detection voltage Vis is compared with the reference voltage VREF and scale-up is performed, thereby performing differential comparison amplification to obtain the difference amplification signal.
  • the first amplifying unit 121 includes a first amplifier OP1, a first input resistor R3, a first reference resistor R2 and a first feedback resistor R1, and the first amplifier OP1 includes a first non-inverting terminal IN+1 and a first inverting terminal. IN-1 and the first amplified output O1.
  • the first inverting terminal IN+1 is electrically connected to the first input resistor R3 and receives the detection voltage Vis.
  • the first inverting terminal IN-1 is electrically connected to the ground GND through the first feedback resistor R1.
  • the first reference resistor R2 is electrically connected to the first inverting terminal IN-1 and the first amplifying output terminal O1.
  • the second amplifying unit 122 includes a second amplifier OP2, and the second amplifier OP2 includes a second non-inverting terminal IN+2, a second inverting terminal IN-2, and a second amplifying output terminal O2.
  • the second inverting terminal IN+2 is electrically connected to the first amplified output O1 and is configured to receive the amplified detection voltage Vis, and the second inverting terminal is electrically connected to the feedback adjusting unit 15 for receiving
  • the reference voltage V REF is used to output the difference amplification signal.
  • the specific working process of the first amplifying unit 121 and the second amplifying unit 122 is:
  • the first amplifying unit 121 performs a forward amplification process on the detection voltage Vis, and the detected potential Vis after the amplification process is: (Vis-Vos) (1+R2/R1), where Vos is the input bias voltage of the first amplifier OP1. .
  • the second amplifying unit 122 compares and amplifies the difference between the detected voltage Vis after the amplification process and the reference voltage V REF and obtains the difference amplified signal as: ((Vis-Vos)(1+R2/R1)-VREF)*Q, Where Q is the amplification factor of the second amplifier OP2 itself.
  • the feedback control unit 13 is a negative feedback circuit that sets and adjusts the PWM signal duty ratio according to the difference amplification signal, and sets the differential amplification signal to a PWM signal that adjusts the duty ratio. As the feedback adjustment signal.
  • the switch control unit 14 may be a PWM pulse width modulation circuit that adjusts the first current by setting a PWM signal after adjusting the duty ratio to obtain a corrected charging current IL such that the charging current IL is in a set current range.
  • the feedback adjustment unit 15 includes a conversion unit 151, a storage unit 152, and a reference voltage generation unit 153, and a control unit 154.
  • the conversion unit 151 is for converting the charging current into a digital form, such as a digital to analog conversion circuit.
  • the storage unit 152 is configured to store a plurality of set current ranges and the reference voltage corresponding to each set current range.
  • the plurality of set current ranges and their corresponding reference voltages may be arranged in an order from small to large:
  • V REF0 V REF1 , V REF2 ,...V REF(n-1) , V REFn , V REF(n+1) ,...,V REF(n+i-1) ,V REF(n +i) , V REF(n+i+1) , ... ⁇
  • i and n are positive integers, and i and n both represent the order of arrangement.
  • the arrangement order of the set current ranges is the same as the order of the reference voltages V REF and the same arrangement bits correspond to each other, that is, IL 0 corresponds to V REF0 , and IL 1 corresponds to V REF1 , .
  • IL (n+i) corresponds to V REF(n+i) , and so on.
  • the control unit 154 is configured to respectively read the charging current IL in the digital form output by the conversion unit 151 and the current set current range stored in the storage unit 152, and then compare the two.
  • the reference voltage V REF needs to be adjusted, that is, the current reference voltage V REF is adjusted.
  • (n+i) is a reference voltage V REF(n+i-1) before it sorted or a reference voltage V REF(n+i+1) sorted thereafter.
  • the charging current IL is greater than the current set current range, the reference voltage V REF(n+i+1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) ;
  • the charging current IL is smaller than the current set current range, and the reference voltage V REF(n+i-1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) .
  • the reference voltage generating unit 153 is electrically connected to the storage unit 152 through an I 2 C data transmission line for generating a reference voltage V REF in a corresponding analog voltage according to the reference voltage value.
  • the reference voltage generating unit 153 is a digital adjustable potentiometer (such as a digital adjustable resistor), which adjusts the output resistance of the adjustable resistor by the reference voltage value read from the storage unit 152 to adjust the output reference. Voltage V REF .
  • FIG. 2 is a flowchart of a charging correction method in the charging device shown in FIG. 1 .
  • Step 201 outputting a charging current and a charging voltage.
  • the charging device 10 is powered on, and the conversion processing circuit 102 receives the alternating current voltage from the charging input terminal 101 and converts it into a direct current signal including a charging voltage and a charging current from the power supply pin Vbus and the grounding lead in the power output interface 103. Foot G1 output.
  • Step 202 Acquire a detection voltage of the charging current, convert the charging current into a detection voltage, compare and amplify the detection voltage with a reference voltage, and obtain a difference amplification signal.
  • the first amplifying unit 121 performs a forward amplification process on the detection voltage Vis, and the detection potential Vi after the amplification process is:
  • Vos is the input bias voltage of the first amplifier OP1.
  • the second amplifying unit 122 performs comparison and amplification on the difference between the detected voltage and the reference voltage and obtains the difference amplified signal as: ((Vis-Vos)(1+R2/R1)-VREF)*Q, where Q is the second amplifier OP2 The magnification factor of itself.
  • Step 203 Output a feedback adjustment signal according to the difference amplification signal.
  • the feedback control unit 13 adjusts the duty ratio of the PWM signal according to the difference amplification signal.
  • Step 204 Adjust a charging current IL output by the voltage pin Vbus according to the feedback adjustment signal.
  • the switch control unit 14 adjusts the charging current IL outputted by the power supply output terminal UO according to the PWM signal, and transmits the corrected adjusted charging current IL to the power supply pin Vbus through the power supply output terminal UO.
  • Step 205 Determine whether the charging current and the current set current range match each other. If yes, the process ends; if not, return to step 202.
  • the pre-stored reference voltage V REF is reacquired to adjust the reference voltage to control the difference amplification signal and the feedback adjustment signal correspondingly. Adjusted until the charging current matches the current set current range.
  • the conversion unit 151 in the feedback adjustment unit 15 converts the current charging current IL into a digital form, and then compares it with the current set current range IL(n+i) in the storage unit 152, so that the current set current range can be understood.
  • the reference voltage corresponding to IL(n+i) is also V REF(n+i) .
  • the charging current IL matches the current set current range IL(n+i), that is, the IL is in the current set current range IL(n+i), that is, the current reference voltage V.
  • REF(n+i) is a reference voltage suitable for the current output charging current IL, and it can ensure that the charging current IL is in the range of demand.
  • voltage V REF that is, adjusting the current reference voltage V REF (n + i) is sorted in a reference voltage V REF front of (n + i-1) or a subsequent sorting reference voltage V REF (n + i +1) .
  • the reference voltage V REF(n+i+1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) ;
  • the charging current is less than the current set current range, and the reference voltage V REF(n+i-1) is read from the memory unit 152 for the current reference voltage V REF(n+i) .
  • the adjusted reference voltage is the previous reference voltage V REF(n+i-1) or the next reference voltage V REF(n+i-1) of the current reference voltage. Specifically, if the charging current IL is greater than the current set current range IL(n+i), the reference voltage is adjusted to V REF(n+i-1) ; if the charging current is less than the current setting The current range is adjusted to V REF(n+i+1) .
  • the reference voltage V REF can be adjusted in real time according to the current actual output charging current IL of the power supply pin Vbus, so that the first amplifier OP1 in the first amplifying unit 121 can be cancelled by the reference voltage V REF due to the input.
  • the disturbance effect of the bias voltage Vos ensures that the charging current IL can be accurately located within the set current range, and at the same time, it is not necessary to specifically limit the bias voltage Vos of the first amplifier OP1 in order to reduce the disturbance effect of the bias voltage Vos. The cost of the first amplifier OP1 is reduced.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract

The present invention relates to a charging apparatus, comprising a power supply output interface, a feedback reference comparison unit, a feedback control unit, a switch control unit and a feedback adjustment unit, wherein the power supply output interface comprises a power supply pin for outputting a charging current and a charging voltage, and a ground pin; the feedback reference comparison unit carries out difference comparison and amplification on a detection voltage, corresponding to the charging current, and a reference voltage so as to obtain a difference amplification signal; the feedback control unit outputs a feedback adjustment signal according to the difference amplification signal; the switch control unit adjusts the charging current according to the feedback adjustment signal; and the feedback adjustment unit stores multiple set current ranges and reference voltages corresponding thereto, and adjusts a current reference voltage when it is determined that the charging current does not match a current set current range, such that the charging current matches the current set current range. Further disclosed is a correction method for a charging current of the charging apparatus.

Description

充电装置与充电校正方法Charging device and charging correction method 技术领域Technical field
本发明涉及一种充电技术，具体涉及一种能够准确调整充电电流的充电装置以及校正方法。The present invention relates to a charging technology, and in particular to a charging device capable of accurately adjusting a charging current and a correction method.
背景技术Background technique
随着智能电子产品的广泛应用，智能电子产品的耗电量随着使用时间或者运行的程序逐渐增大。除增加智能电子产品电池容量外，针对电池进行快速充电以减小充电时间成为目前较为广泛的电池耗电增加的解决方案。With the widespread use of smart electronic products, the power consumption of smart electronic products has gradually increased with time of use or running programs. In addition to increasing the battery capacity of smart electronic products, fast charging of batteries to reduce charging time has become a solution to the current increase in battery power consumption.
执行快速充电时通常的解决方案为提高充电电流，当充电电流提高后，充电用的适配器、充电线缆以及待充电的电子设备在充电时所承受的电压也会相应增加。The usual solution for performing fast charging is to increase the charging current. When the charging current is increased, the charging adapter, the charging cable, and the electronic device to be charged will also be subjected to a corresponding increase in voltage during charging.
现有技术中，为了保证充电安全性，充电装置中通常针对输出的充电电流进行电压检测，也即是通过实时检测输出电压来判定充电装置输出的电源是否处于预设范围。但是，实际上，针对当前实时输出的充电电流检测后需进行放大处理，但是由于放大器本身存在偏置电压或者误差，导致处理后的充电电流存在偏差，从而导致据此调整后的充电电流无法准确达到预设范围，也即是无法准确控制充电电流。In the prior art, in order to ensure charging safety, the charging device generally performs voltage detection on the output charging current, that is, determines whether the power output by the charging device is within a preset range by detecting the output voltage in real time. However, in practice, the charging current needs to be amplified after the current real-time output is detected. However, due to the bias voltage or error of the amplifier itself, the charging current after processing is deviated, resulting in an inaccurate charging current. The preset range is reached, that is, the charging current cannot be accurately controlled.
发明内容Summary of the invention
本发明实施例公开了一种能够较为准确校正输出的充电电流的充电装置。The embodiment of the invention discloses a charging device capable of correcting the output charging current more accurately.
本发明公开一种前述充电装置的充电校正方法。The invention discloses a charging correction method of the foregoing charging device.
一种充电装置，包括电源输出接口、反馈参考比较单元、反馈控制单元、开关控制单元以及反馈调整单元。其中，电源输出接口包括用于输出充电电流与充电电压的电源引脚与接地引脚。反馈参考比较单元电性连接所述电源引脚，用于将对应所述充电电流的检测电压与参考电压进行差值比较放大并且获得差值放大信号。反馈控制单元电性连接所述反馈参考比较单元，用于依据所述差值放大信号输出反馈调整信号。开关控制单元，电性连接电源输入端、所述 电压引脚与所述反馈控制单元。所述开关控制单元用于自电源输入端接收直流电源并且将所述直流电源中的第一电流转换为充电电流输出至所述电源引脚，以及依据所述反馈调整信号调整所述充电电流。反馈调整单元存储有多个设定电流范围及每一个设定电流范围对应的所述参考电压，并且所述反馈调整单元判定所述充电电流与当前的设定电流范围是否相互匹配，当所述充电电流与当前的设定电流范围不匹配时，重新获取预先存储的参考电压以调整所述参考电压控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流与所述当前的设定电流范围匹配。A charging device includes a power output interface, a feedback reference comparison unit, a feedback control unit, a switch control unit, and a feedback adjustment unit. The power output interface includes a power pin and a ground pin for outputting a charging current and a charging voltage. The feedback reference comparison unit is electrically connected to the power pin for comparing and comparing the difference between the detection voltage corresponding to the charging current and the reference voltage and obtaining a difference amplification signal. The feedback control unit is electrically connected to the feedback reference comparison unit for outputting a feedback adjustment signal according to the difference amplification signal. The switch control unit is electrically connected to the power input terminal, the voltage pin and the feedback control unit. The switch control unit is configured to receive a DC power source from a power input terminal and convert a first current in the DC power source into a charge current output to the power pin, and adjust the charging current according to the feedback adjustment signal. The feedback adjustment unit stores a plurality of set current ranges and the reference voltage corresponding to each set current range, and the feedback adjustment unit determines whether the charging current and the current set current range match each other when When the charging current does not match the current set current range, re-acquiring the pre-stored reference voltage to adjust the reference voltage to control the difference amplification signal and the feedback adjustment signal correspondingly adjusted until the charging current is The current set current range matches.
一种充电校正方法，包括：A charging correction method comprising:
输出充电电流与充电电压；Output charging current and charging voltage;
将对应所述充电电流转换为检测电压，并将所述检测电压与参考电压进行差值比较放大并且获得差值放大信号；Converting the corresponding charging current into a detection voltage, and comparing and comparing the difference between the detection voltage and the reference voltage to obtain a difference amplification signal;
依据所述差值放大信号输出反馈调整信号；Outputting a feedback adjustment signal according to the difference amplification signal;
依据所述反馈调整信号调整所述电压端输出的充电电流；Adjusting a charging current output by the voltage terminal according to the feedback adjustment signal;
判定所述充电电流与当前的设定电流范围是否相互匹配，当所述充电电流与当前的设定电流范围不匹配时，重新获取预先存储的参考电压以调整所述参考电压控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流与所述当前的设定电流范围匹配。Determining whether the charging current and the current set current range match each other, and when the charging current does not match the current set current range, reacquiring the pre-stored reference voltage to adjust the reference voltage to control the difference The amplified signal and the feedback adjustment signal are correspondingly adjusted until the charging current matches the current set current range.
相较于现有技术，参考电压的完全可以依据电源端当前实际输出的充电电流进行实时调节，从而能够通过参考电压抵消反馈参考比较单元中放大器由于存在输入偏置电压的扰动影响，保证充电电流能够准确地位于设定电流范围内，同时，还无需专门为了降低偏置电压的扰动影响而针对第一放大器的偏置电压进行限定，降低了第一放大器的成本。Compared with the prior art, the reference voltage can be adjusted in real time according to the current actual output charging current of the power supply terminal, so that the reference voltage can be offset by the reference voltage in the feedback reference comparison unit, and the charging current is ensured due to the disturbance of the input bias voltage. It can be accurately located within the set current range, and at the same time, it is not necessary to specifically limit the bias voltage of the first amplifier in order to reduce the influence of the disturbance of the bias voltage, thereby reducing the cost of the first amplifier.
附图说明DRAWINGS
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.
图1为充电装置的电路结构示意图。1 is a schematic diagram showing the circuit structure of a charging device.
图2为图1所示充电装置执行充电校正方法的流程图。2 is a flow chart of a charging correction method performed by the charging device shown in FIG. 1.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
下面结合附图具体说明充电装置的具体结构。The specific structure of the charging device will be specifically described below with reference to the drawings.
如图1所示，充电装置10用于将交流电源转换为直流电源，并且通过充电线缆(图未示)传输至电子设备(图未示)，从而为电子设备进行充电。其中，直流电源包括有充电电压与充电电流。As shown in FIG. 1, the charging device 10 is configured to convert an alternating current power source into a direct current power source and transmit it to an electronic device (not shown) through a charging cable (not shown) to charge the electronic device. Among them, the DC power supply includes a charging voltage and a charging current.
具体地，充电装置10包括充电输入端101、转换处理电路102，电源输出接口103以及校正电路104。Specifically, the charging device 10 includes a charging input terminal 101, a conversion processing circuit 102, a power output interface 103, and a correction circuit 104.
其中，充电输入端101用于与交流电源电性连接以接收交流电信号，转换电路102电性连接所述充电输入端101与电源输出接口103之间，用于将交流电信号转换为直流电信号，所述直流电信号包括第一电流。The charging input terminal 101 is electrically connected to the AC power source to receive the AC power signal, and the conversion circuit 102 is electrically connected between the charging input terminal 101 and the power output interface 103 for converting the AC signal into a DC signal. The direct current signal includes a first current.
本实施例中，充电装置10中电源输出接口103为USB充电接口，包括电源引脚Vbus，、接地引脚G1、第一数据引脚D1与第二数据引脚D2，电源引脚Vbus与接地引脚G1配合用于传输充电电压与充电电流IL，第一数据引脚D1与第二数据引脚D2用于传输数据信号。In this embodiment, the power output interface 103 of the charging device 10 is a USB charging interface, including a power pin Vbus, a ground pin G1, a first data pin D1 and a second data pin D2, and a power pin Vbus and ground. The pin G1 is used for transmitting the charging voltage and the charging current IL, and the first data pin D1 and the second data pin D2 are used for transmitting the data signal.
校正电路104通过电源输入端UI电性连接转换处理电路102以及通过电源输出端UO电性连接电压引脚Vbus，用于针对转换处理电路输出的直流电源中的充电电流进行校正从而获得自电源输出接口103输出的充电电流，使其处于设定的电流范围内。The correction circuit 104 is electrically connected to the conversion processing circuit 102 through the power input terminal UI and electrically connected to the voltage pin Vbus through the power output terminal UO for correcting the charging current in the DC power supply outputted by the conversion processing circuit to obtain the self-power output. The charging current output by the interface 103 is within a set current range.
其中，校正电路包括检测单元11、反馈参考比较单元12、反馈控制单元13，开关控制单元14、反馈调整单元15。检测单元11电性连接所述电源输出端UO，用于将充电电流IL转换为检测电压Vis。The correction circuit includes a detection unit 11, a feedback reference comparison unit 12, a feedback control unit 13, a switch control unit 14, and a feedback adjustment unit 15. The detecting unit 11 is electrically connected to the power output terminal UO for converting the charging current IL into the detecting voltage Vis.
反馈参考比较单元12电性连接检测单元11，用于将对应所述检测电压 Vis与参考电压V REF进行比较放大并且获得差值的放大信号。 The feedback reference comparison unit 12 is electrically connected to the detection unit 11 for comparing and amplifying the detection voltage Vis with the reference voltage V REF and obtaining an amplified signal of the difference.
反馈控制单元13电性连接所述反馈参考比较单元12，用于依据所述差值放大信号输出反馈调整信号。The feedback control unit 13 is electrically connected to the feedback reference comparison unit 12 for outputting a feedback adjustment signal according to the difference amplification signal.
开关控制单元14电性连接电源输入端UI、电源输出端UO以及反馈控制单元13。其中，开关控制单元14自电源输入端UI接收直流电源，并且所述直流电源中的第一电流转换为充电电流输出至所述电源引脚Vbus的电源输出端UO，以及依据自反馈控制单元13所接收到的所述反馈调整信号调整所述充电电流，并使调整后的充电电流处于设定电流范围内。The switch control unit 14 is electrically connected to the power input terminal UI, the power output terminal UO, and the feedback control unit 13. The switch control unit 14 receives a DC power source from the power input terminal UI, and the first current in the DC power source is converted into a charging current output to the power output terminal UO of the power pin Vbus, and according to the self-feedback control unit 13 The received feedback adjustment signal adjusts the charging current and causes the adjusted charging current to be within a set current range.
反馈调整单元15电性连接检测单元11与反馈参考比较单元12。The feedback adjustment unit 15 is electrically connected to the detection unit 11 and the feedback reference comparison unit 12.
反馈调整单元15预先存储有多个设定电流范围及其对应的所述参考电压，并且可以接收外部操作指令而设定当前需要求的设定电流范围。当与电压输出端UO连接的电压引脚Vbus输出的充电电流为IL时，反馈调整单元15判定所述充电电流IL与当前的设定电流范围是否相互匹配。当所述充电电流IL与当前的设定电流范围不匹配时，反馈调整单元15调整当前采用的参考电压V REF以控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流IL与所述当前的设定电流范围匹配。 The feedback adjustment unit 15 pre-stores a plurality of set current ranges and their corresponding reference voltages, and can receive an external operation command to set a current set current demand range. When the charging current outputted by the voltage pin Vbus connected to the voltage output terminal UO is IL, the feedback adjusting unit 15 determines whether the charging current IL and the current set current range match each other. When the charging current IL does not match the current set current range, the feedback adjusting unit 15 adjusts the currently used reference voltage V REF to control the difference amplification signal and the feedback adjustment signal correspondingly adjusted until the charging The current IL matches the current set current range.
具体地，检测单元11包括检测输入端111、第一检测电阻RL、第二检测电阻Ris以及检测输出端112。检测输入端111电性连接电源输出端UO，第一检测电阻RL电性连接于电源输入端UI与检测输出端112，所述第二检测电阻Ris电性连接检测输出端112与接地端GND之间。第一检测电阻RL、第二检测电阻Ris串联在电源输入端UO与接地端GND之间，用于将充电电流IL转换为检测电压Vis。那么，自检测输出端112输出的检测电压Vis与充电电流IL的关系为：Vis＝IL*Ris。Specifically, the detecting unit 11 includes a detecting input terminal 111, a first detecting resistor RL, a second detecting resistor Ris, and a detecting output terminal 112. The detection input terminal 111 is electrically connected to the power output terminal UO. The first detection resistor RL is electrically connected to the power input terminal UI and the detection output terminal 112. The second detection resistor Ris is electrically connected to the detection output terminal 112 and the ground terminal GND. between. The first detecting resistor RL and the second detecting resistor Ris are connected in series between the power input terminal UO and the ground GND for converting the charging current IL into the detecting voltage Vis. Then, the relationship between the detection voltage Vis outputted from the detection output terminal 112 and the charging current IL is: Vis=IL*Ris.
反馈参考比较单元12包括第一放大单元121与第二放大单元122，所述第一放大单元121用于前向放大所述检测电压Vis，所述第二放单元122用于将放大后的所述检测电压Vis与所述参考电压VREF进行比较以及执行比例放大，从而执行差值比较放大以获得所述差值放大信号。The feedback reference comparison unit 12 includes a first amplifying unit 121 for forwardly amplifying the detection voltage Vis, and a second amplifying unit 122 for using the enlarged unit The detection voltage Vis is compared with the reference voltage VREF and scale-up is performed, thereby performing differential comparison amplification to obtain the difference amplification signal.
第一放大单元121包括第一放大器OP1、第一输入电阻R3、第一参考电阻R2与第一反馈电阻R1，所述第一放大器OP1包括第一同相端IN+1、第一 反相端IN-1以及第一放大输出端O1。第一同相端IN+1电性连接所述第一输入电阻R3并且接收所述检测电压Vis，所述第一反相端IN-1通过所述第一反馈电阻R1电性连接接地端GND，所述第一参考电阻R2电性连接所述第一反相端IN-1与所述第一放大输出端O1。The first amplifying unit 121 includes a first amplifier OP1, a first input resistor R3, a first reference resistor R2 and a first feedback resistor R1, and the first amplifier OP1 includes a first non-inverting terminal IN+1 and a first inverting terminal. IN-1 and the first amplified output O1. The first inverting terminal IN+1 is electrically connected to the first input resistor R3 and receives the detection voltage Vis. The first inverting terminal IN-1 is electrically connected to the ground GND through the first feedback resistor R1. The first reference resistor R2 is electrically connected to the first inverting terminal IN-1 and the first amplifying output terminal O1.
所述第二放大单元122包括第二放大器OP2，所述第二放大器OP2包括第二同相端IN+2、第二反相端IN-2以及第二放大输出端O2。第二同相端IN+2电性连接所述第一放大输出O1并且用于接收放大后的所述检测电压Vis，所述第二反相端电性连接所述反馈调整单元15用于接收所述参考电压V REF，所述第二放大输出端O2用于输出所述差值放大信号。 The second amplifying unit 122 includes a second amplifier OP2, and the second amplifier OP2 includes a second non-inverting terminal IN+2, a second inverting terminal IN-2, and a second amplifying output terminal O2. The second inverting terminal IN+2 is electrically connected to the first amplified output O1 and is configured to receive the amplified detection voltage Vis, and the second inverting terminal is electrically connected to the feedback adjusting unit 15 for receiving The reference voltage V REF is used to output the difference amplification signal.
具体地，第一放大单元121与第二放大单元122具体工作过程为：Specifically, the specific working process of the first amplifying unit 121 and the second amplifying unit 122 is:
充电电流IL流过检测单元11中的第一检测电阻RL与第二检测电阻Ris，那么自检测输出端112输出的检测电压Vis为：Vis＝I*Ris。The charging current IL flows through the first detecting resistor RL and the second detecting resistor Ris in the detecting unit 11, and the detection voltage Vis output from the detecting output terminal 112 is: Vis=I*Ris.
第一放大单元121针对检测电压Vis进行前向放大处理，经过放大处理后的检测电位Vis为：(Vis-Vos)(1+R2/R1)，其中Vos为第一放大器OP1的输入偏置电压。The first amplifying unit 121 performs a forward amplification process on the detection voltage Vis, and the detected potential Vis after the amplification process is: (Vis-Vos) (1+R2/R1), where Vos is the input bias voltage of the first amplifier OP1. .
第二放大单元122针对放大处理后的检测电压Vis与参考电压V REF进行差值比较放大并且获得差值放大信号为：((Vis-Vos)(1+R2/R1)-VREF)*Q，其中Q为第二放大器OP2的本身的放大系数。 The second amplifying unit 122 compares and amplifies the difference between the detected voltage Vis after the amplification process and the reference voltage V REF and obtains the difference amplified signal as: ((Vis-Vos)(1+R2/R1)-VREF)*Q, Where Q is the amplification factor of the second amplifier OP2 itself.
反馈控制单元13为负反馈电路，所述负反馈电路依据所述差值放大信号来设定并且调整PWM信号占空比，并且将所述经差值放大信号设定调整占空比的PWM信号作为所述反馈调整信号。The feedback control unit 13 is a negative feedback circuit that sets and adjusts the PWM signal duty ratio according to the difference amplification signal, and sets the differential amplification signal to a PWM signal that adjusts the duty ratio. As the feedback adjustment signal.
开关控制单元14可为PWM脉宽调制电路，通过设定调整占空比后的PWM信号针对第一电流进行调整获得校正后充电电流IL，以使得充电电流IL处于设定电流范围。The switch control unit 14 may be a PWM pulse width modulation circuit that adjusts the first current by setting a PWM signal after adjusting the duty ratio to obtain a corrected charging current IL such that the charging current IL is in a set current range.
反馈调整单元15包括转换单元151、存储单元152以及参考电压产生单元153以及控制单元154。转换单元151用于将充电电流转换为数字形式，例如数模转换电路。The feedback adjustment unit 15 includes a conversion unit 151, a storage unit 152, and a reference voltage generation unit 153, and a control unit 154. The conversion unit 151 is for converting the charging current into a digital form, such as a digital to analog conversion circuit.
所述存储单元152用于存储多个设定电流范围以及每个设定电流范围对应的所述参考电压。The storage unit 152 is configured to store a plurality of set current ranges and the reference voltage corresponding to each set current range.
具体地，所述多个设定电流范围及其对应的所述参考电压包括按照从小到大的排列顺序可为：Specifically, the plurality of set current ranges and their corresponding reference voltages may be arranged in an order from small to large:
{IL 0，IL 1，IL 2，...IL (n-1)，IL n，IL (n+1)，...，IL (n+i-1)，IL (n+i)，IL (n+i+1)，......} {IL 0 , IL 1 , IL 2 ,...IL (n-1) , IL n ,IL (n+1) ,...,IL (n+i-1) ,IL (n+i) , IL (n+i+1) ,......}
{V REF0，V REF1，V REF2，...V REF(n-1)，V REFn，V REF(n+1)，...，V REF(n+i-1)，V REF(n+i)，V REF(n+i+1)，......}，其中i、n为正整数，并且i、n均表示排列次序。可以理解，设定电流范围的排列顺序与参考电压V REF的排列顺序相同并且相同排列位二者相互对应，也即是IL 0对应V REF0，IL 1对应V REF1，......，IL (n+i)对应V REF(n+i)，依次类推。 {V REF0 , V REF1 , V REF2 ,...V REF(n-1) , V REFn , V REF(n+1) ,...,V REF(n+i-1) ,V REF(n +i) , V REF(n+i+1) , ...}, where i and n are positive integers, and i and n both represent the order of arrangement. It can be understood that the arrangement order of the set current ranges is the same as the order of the reference voltages V REF and the same arrangement bits correspond to each other, that is, IL 0 corresponds to V REF0 , and IL 1 corresponds to V REF1 , . IL (n+i) corresponds to V REF(n+i) , and so on.
控制单元154用于分别读取转换单元151输出的数字形式的充电电流IL以及存储单元152中存储的当前设定电流范围，然后针对二者进行比较。当所述充电电流IL没有处于当前的设定电流范围内，则表明充电电流IL与当前的设定电流范围不匹配，则需调整所述参考电压V REF，也即是调整当前参考电压V REF(n+i)为排序在其前的一个参考电压V REF(n+i-1)或者排序其后的一个参考电压V REF(n+i+1)。具体地，若所述充电电流IL大于当前的设定电流范围，重新自存储单元152中读取参考电压V REF(n+i+1)代替当前参考电压V REF(n+i)；若所述充电电流IL小于当前的设定电流范围，重新自存储单元152中读取参考电压V REF(n+i-1)代替当前参考电压V REF(n+i)。 The control unit 154 is configured to respectively read the charging current IL in the digital form output by the conversion unit 151 and the current set current range stored in the storage unit 152, and then compare the two. When the charging current IL is not within the current set current range, indicating that the charging current IL does not match the current set current range, the reference voltage V REF needs to be adjusted, that is, the current reference voltage V REF is adjusted. (n+i) is a reference voltage V REF(n+i-1) before it sorted or a reference voltage V REF(n+i+1) sorted thereafter. Specifically, if the charging current IL is greater than the current set current range, the reference voltage V REF(n+i+1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) ; The charging current IL is smaller than the current set current range, and the reference voltage V REF(n+i-1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) .
所述参考电压产生单元153通过I 2C数据传输线电性连接所述存储单元152，用于依据参考电压数值产生对应的模拟电压形式的参考电压V REF。本实施例中，参考电压产生单元153为数字可调电位器(如数字式可调电阻)，其通过自存储单元152读取到的参考电压数值调整可调电阻的输出电阻进而调整输出的参考电压V REF。 The reference voltage generating unit 153 is electrically connected to the storage unit 152 through an I 2 C data transmission line for generating a reference voltage V REF in a corresponding analog voltage according to the reference voltage value. In this embodiment, the reference voltage generating unit 153 is a digital adjustable potentiometer (such as a digital adjustable resistor), which adjusts the output resistance of the adjustable resistor by the reference voltage value read from the storage unit 152 to adjust the output reference. Voltage V REF .
请参阅图2，其为图1所示充电装置中充电校正方法的流程图。Please refer to FIG. 2 , which is a flowchart of a charging correction method in the charging device shown in FIG. 1 .
步骤201，输出充电电流与充电电压。具体地，充电装置10上电，转换处理电路102从充电输入端101接收到交流电压并且将其转换为包括充电电压与充电电流的直流电信号自电源输出接口103中的电源引脚Vbus与接地引脚G1输出。 Step 201, outputting a charging current and a charging voltage. Specifically, the charging device 10 is powered on, and the conversion processing circuit 102 receives the alternating current voltage from the charging input terminal 101 and converts it into a direct current signal including a charging voltage and a charging current from the power supply pin Vbus and the grounding lead in the power output interface 103. Foot G1 output.
步骤202，获取所述充电电流的检测电压，将所述充电电流转换为检测电压，并将所述检测电压与参考电压进行比较放大并且获得差值放大信号。Step 202: Acquire a detection voltage of the charging current, convert the charging current into a detection voltage, compare and amplify the detection voltage with a reference voltage, and obtain a difference amplification signal.
具体地，充电电流电流IL流过检测单元11中的第一检测电阻RL与第二检测电阻Ris，那么自检测输出端112输出的检测电压Vis为：Vis＝IL*Ris。Specifically, the charging current current IL flows through the first detecting resistor RL and the second detecting resistor Ris in the detecting unit 11, and the detection voltage Vis output from the detecting output terminal 112 is: Vis=IL*Ris.
第一放大单元121针对检测电压Vis进行前向放大处理，经过放大处理后的检测电位Vi为：The first amplifying unit 121 performs a forward amplification process on the detection voltage Vis, and the detection potential Vi after the amplification process is:
(Vis-Vos)(1+R2/R1)，其中Vos为第一放大器OP1的输入偏置电压。(Vis-Vos) (1+R2/R1), where Vos is the input bias voltage of the first amplifier OP1.
第二放大单元122针对检测电压与参考电压进行差值比较放大并且获得差值放大信号为：((Vis-Vos)(1+R2/R1)-VREF)*Q，其中Q为第二放大器OP2的本身的放大系数。The second amplifying unit 122 performs comparison and amplification on the difference between the detected voltage and the reference voltage and obtains the difference amplified signal as: ((Vis-Vos)(1+R2/R1)-VREF)*Q, where Q is the second amplifier OP2 The magnification factor of itself.
步骤203，依据所述差值放大信号输出反馈调整信号。Step 203: Output a feedback adjustment signal according to the difference amplification signal.
反馈控制单元13则依据差值放大信号调整PWM信号的占空比。The feedback control unit 13 adjusts the duty ratio of the PWM signal according to the difference amplification signal.
步骤204，依据所述反馈调整信号调整所述电压引脚Vbus输出的充电电流IL。Step 204: Adjust a charging current IL output by the voltage pin Vbus according to the feedback adjustment signal.
开关控制单元14则依据PWM信号调整电源输出端UO输出的充电电流IL，并且通过电源输出端UO将校正调整后的充电电流IL传输至电源引脚Vbus。The switch control unit 14 adjusts the charging current IL outputted by the power supply output terminal UO according to the PWM signal, and transmits the corrected adjusted charging current IL to the power supply pin Vbus through the power supply output terminal UO.
步骤205，判定所述充电电流与当前的设定电流范围是否相互匹配。若是，则流程结束；若否，则返回步骤202。Step 205: Determine whether the charging current and the current set current range match each other. If yes, the process ends; if not, return to step 202.
也即，当所述IL充电电流与当前的设定电流范围不匹配时，重新获取预先存储的参考电压V REF以调整所述参考电压以控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流与所述当前的设定电流范围匹配。 That is, when the IL charging current does not match the current set current range, the pre-stored reference voltage V REF is reacquired to adjust the reference voltage to control the difference amplification signal and the feedback adjustment signal correspondingly. Adjusted until the charging current matches the current set current range.
具体地，反馈调整单元15中转换单元151将当前充电电流IL转换为数字形式，然后将其与存储单元152中当前设定电流范围IL(n+i)进行比较，可以理解当前设定电流范围IL(n+i)对应的参考电压也为V REF(n+i)。 Specifically, the conversion unit 151 in the feedback adjustment unit 15 converts the current charging current IL into a digital form, and then compares it with the current set current range IL(n+i) in the storage unit 152, so that the current set current range can be understood. The reference voltage corresponding to IL(n+i) is also V REF(n+i) .
在所述当所述充电电流IL与当前的设定电流范围IL(n+i)匹配时，也即是IL处于当前设定电流范围IL(n+i)范围，也就是表示当前参考电压V REF(n+i)为适于当前输出的充电电流IL的参考电压，能够保证充电电流IL处于需求的范围。 When the charging current IL matches the current set current range IL(n+i), that is, the IL is in the current set current range IL(n+i), that is, the current reference voltage V. REF(n+i) is a reference voltage suitable for the current output charging current IL, and it can ensure that the charging current IL is in the range of demand.
在所述当所述充电电流IL与当前的设定电流范围IL(n+i)不匹配时，也即是当所述充电电流IL没有处于当前的设定电流范围内时，调整所述参考电压V REF，也即是调整当前参考电压V REF(n+i)为排序在其前的一个参考电压 V REF(n+i-1)或者排序其后的一个参考电压V REF(n+i+1)。 Adjusting the reference when the charging current IL does not match the current set current range IL(n+i), that is, when the charging current IL is not within the current set current range. voltage V REF, that is, adjusting the current reference voltage V REF (n + i) is sorted in a reference voltage V REF front of (n + i-1) or a subsequent sorting reference voltage V REF (n + i +1) .
具体地，若所述充电电流大于当前的设定电流范围，重新自存储单元152中读取参考电压V REF(n+i+1)代替当前参考电压V REF(n+i)；若所述充电电流小于当前的设定电流范围，重新自存储单元152中读取参考电压V REF(n+i-1)替当前参考电压V REF(n+i)。 Specifically, if the charging current is greater than the current set current range, the reference voltage V REF(n+i+1) is read from the storage unit 152 instead of the current reference voltage V REF(n+i) ; The charging current is less than the current set current range, and the reference voltage V REF(n+i-1) is read from the memory unit 152 for the current reference voltage V REF(n+i) .
调整后的参考电压为当前所述参考电压前一个参考电压V REF(n+i-1)或者后一个参考电压V REF(n+i-1)。具体地，若所述充电电流IL大于当前的设定电流范围IL(n+i)，将所述参考电压调整为V REF(n+i-1)；若所述充电电流小于当前的设定电流范围，将所述参考电压调整为V REF(n+i+1)。 The adjusted reference voltage is the previous reference voltage V REF(n+i-1) or the next reference voltage V REF(n+i-1) of the current reference voltage. Specifically, if the charging current IL is greater than the current set current range IL(n+i), the reference voltage is adjusted to V REF(n+i-1) ; if the charging current is less than the current setting The current range is adjusted to V REF(n+i+1) .
相较于现有技术，参考电压V REF的完全可以依据电源引脚Vbus当前实际输出的充电电流IL进行实时调节，从而能够通过参考电压V REF抵消第一放大单元121中第一放大器OP1由于输入偏置电压Vos的扰动影响，保证充电电流IL能够准确地位于设定电流范围内，同时，还无需专门为了降低偏置电压Vos的扰动影响而针对第一放大器OP1的偏置电压Vos进行限定，降低了第一放大器OP1的成本。 Compared with the prior art, the reference voltage V REF can be adjusted in real time according to the current actual output charging current IL of the power supply pin Vbus, so that the first amplifier OP1 in the first amplifying unit 121 can be cancelled by the reference voltage V REF due to the input. The disturbance effect of the bias voltage Vos ensures that the charging current IL can be accurately located within the set current range, and at the same time, it is not necessary to specifically limit the bias voltage Vos of the first amplifier OP1 in order to reduce the disturbance effect of the bias voltage Vos. The cost of the first amplifier OP1 is reduced.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The principles and embodiments of the present invention are described herein with reference to specific examples. The description of the above embodiments is only for the purpose of understanding the core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, There is a change in the scope of the present invention and the scope of the application, and the contents of the present specification should not be construed as limiting the invention.

Claims (11)

  1. 一种充电装置，其特征在于，A charging device characterized in that
    电源输出接口，包括用于输出充电电流与充电电压的电源引脚与接地引脚；a power output interface including a power pin and a ground pin for outputting a charging current and a charging voltage;
    反馈参考比较单元，电性连接所述电源引脚，用于将对应所述充电电流的检测电压与参考电压进行差值比较放大并且获得差值放大信号；The feedback reference comparison unit is electrically connected to the power pin for comparing and comparing the difference between the detection voltage corresponding to the charging current and the reference voltage and obtaining a difference amplification signal;
    反馈控制单元，电性连接所述反馈参考比较单元，用于依据所述差值放大信号输出反馈调整信号；a feedback control unit electrically connected to the feedback reference comparison unit for outputting a feedback adjustment signal according to the difference amplification signal;
    开关控制单元，电性连接电源输入端、所述电压引脚与所述反馈控制单元，所述开关控制单元用于自电源输入端接收直流电源并且将所述直流电源中的第一电流转换为充电电流输出至所述电源引脚，以及依据所述反馈调整信号调整所述充电电流；a switch control unit electrically connected to the power input terminal, the voltage pin and the feedback control unit, the switch control unit configured to receive a DC power source from the power input terminal and convert the first current in the DC power source into Charging current is output to the power pin, and the charging current is adjusted according to the feedback adjustment signal;
    反馈调整单元，存储有多个设定电流范围及每一个设定电流范围对应的所述参考电压，并且所述反馈调整单元判定所述充电电流与当前的设定电流范围是否相互匹配，当所述充电电流与当前的设定电流范围不匹配时，重新获取预先存储的参考电压以调整所述参考电压控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流与所述当前的设定电流范围匹配。The feedback adjustment unit stores a plurality of set current ranges and the reference voltage corresponding to each set current range, and the feedback adjustment unit determines whether the charging current and the current set current range match each other. When the charging current does not match the current set current range, re-acquiring the pre-stored reference voltage to adjust the reference voltage to control the difference amplification signal and the feedback adjustment signal correspondingly adjusted until the charging current and the The current set current range is matched.
  2. 根据权利要求1所述的充电装置，其特征在于，所述反馈调整单元接收外部输入操作而设定所述当前设定电流范围，并且依据当前设定电流范围输出所述参考电压。The charging device according to claim 1, wherein the feedback adjustment unit receives an external input operation to set the current set current range, and outputs the reference voltage according to a current set current range.
  3. 根据权利要求2所述的充电装置，其特征在于，所述反馈调整单元包括转换单元、存储单元、控制单元以及参考电压产生单元，所述转换单元用于将充电电流转换为数字形式，所述存储单元用于存储多个设定电流范围以及每个设定电流范围对应的所述参考电压数值，所述控制单元用于比较分所述充电电流以及当前设定电流范围，当所述充电电流没有处于当前的设定电流范围内则表明所述充电电流与所述当前的设定电流范围不匹配，自所述存储单元中重新读取所述参考电压并输出至所述参考电压产生单元，所述参考电压产生单元电性连接所述存储单元，用于依据参考电压数值产生对应的模拟电压形式的参考电压。The charging device according to claim 2, wherein the feedback adjustment unit comprises a conversion unit, a storage unit, a control unit, and a reference voltage generating unit, wherein the conversion unit is configured to convert a charging current into a digital form, The storage unit is configured to store a plurality of set current ranges and the reference voltage values corresponding to each set current range, and the control unit is configured to compare the charge current and the current set current range, when the charge current is Not being in the current set current range, indicating that the charging current does not match the current set current range, re-reading the reference voltage from the memory unit and outputting to the reference voltage generating unit, The reference voltage generating unit is electrically connected to the storage unit for generating a reference voltage in a corresponding analog voltage according to the reference voltage value.
  4. 根据权利要求1所述的充电装置，其特征在于，反馈参考比较单元包括 第一放大单元与第二放大单元，所述第一放大单元用于前向放大所述检测电压，所述第二放单元用于将放大后的所述检测电压与所述参考电压进行比较以及反相比例放大从而执行差值比较放大以获得所述差值放大信号。The charging device according to claim 1, wherein the feedback reference comparing unit comprises a first amplifying unit and a second amplifying unit, wherein the first amplifying unit is configured to forwardly amplify the detecting voltage, and the second placing The unit is configured to compare the amplified detection voltage with the reference voltage and inversely scale up to perform differential comparison amplification to obtain the difference amplification signal.
  5. 根据权利要求4所述的充电装置，其特征在于，所述第一放大单元包括第一放大器、第一输入电阻、第一参考电阻与第一反馈电阻，所述第一放大器包括第一同相端、第一反相端以及第一放大输出端，所述第一同相端电性连接所述第一输入电阻并且接收所述检测电压，所述第一反相端通过所述第一反馈电阻电性连接接地端，所述第一参考电阻电性连接所述第一反相端与所述第一放大输出端；The charging device according to claim 4, wherein the first amplifying unit comprises a first amplifier, a first input resistor, a first reference resistor and a first feedback resistor, and the first amplifier comprises a first in-phase a first inverting terminal and a first amplifying output, the first inverting terminal is electrically connected to the first input resistor and receives the detection voltage, and the first inverting end passes the first feedback The resistor is electrically connected to the ground, and the first reference resistor is electrically connected to the first inverting end and the first amplified output end;
    所述第二放大单元包括第二放大器，所述第二放大器包括第二同相端、第二反相端以及第二放大输出端，所述第二同相端电性连接所述第一放大输出端并且用于接收放大后的所述检测电压，所述第二反相端电性连接所述反馈调整单元用于接收所述参考电压，所述第二放大输出端用于输出所述差值放大信号。The second amplifying unit includes a second amplifier, the second amplifier includes a second non-inverting terminal, a second inverting terminal, and a second amplifying output end, and the second in-phase terminal is electrically connected to the first amplifying output end And for receiving the amplified detection voltage, the second inverting terminal is electrically connected to the feedback adjustment unit for receiving the reference voltage, and the second amplification output is configured to output the difference amplification signal.
  6. 根据权利要求1所述的充电装置，其特征在于，反馈控制单元为负反馈电路，所述负反馈电路依据所述差值放大信号设定PWM信号占空比，并且将所述经设定占空比后的PWM信号作为所述反馈调整信号。The charging device according to claim 1, wherein the feedback control unit is a negative feedback circuit, and the negative feedback circuit sets a PWM signal duty ratio according to the difference amplification signal, and the set is occupied The PWM signal after the ratio is used as the feedback adjustment signal.
  7. 根据权利要求1-6任意一项所述的充电装置，其特征在于，所述充电装置还包括检测单元以用于将所述充电电流转换为检测电压，所述检测单元包括检测输入端、第一检测电阻、第二检测电阻以及检测输出端，所述检测输入端电性连接所述电源引脚，所述第一检测电阻电性连接于所述电源端与所述检测输出端，所述第二检测电阻电性连接所述检测输出端与接地端之间。The charging device according to any one of claims 1 to 6, wherein the charging device further comprises a detecting unit for converting the charging current into a detecting voltage, the detecting unit comprising a detecting input terminal, a detection resistor, a second detection resistor, and a detection output, the detection input is electrically connected to the power pin, and the first detection resistor is electrically connected to the power terminal and the detection output, The second detecting resistor is electrically connected between the detecting output end and the ground end.
  8. 根据权利要求7述的充电装置，其特征在于，所述多个设定电流范围及其对应的所述参考电压包括按照从小到大的排列的{V REF0，V REF1，V REF2，...V REF(n-1)，V REFn，V REF(n+1)，...V REF(n+i-1)，V REF(n+i)，V REF(n+i+1)，......}，其中，在所述当所述充电电流与当前的设定电流范围不匹配时调整所述参考电压的步骤中，调整后的参考电压为当前所述参考电压前一个参考电压或者后一个参考电压，若所述充电电流大于当前的设定电流范围，将所述参考电压调整为V REF(n+i-1)；若所述充电电流小于当前的设定电流范围，将所述参考电压调整为V REF(n+i+1)，其中，V REF(n+i)为当前所述参考电压，i、n为正整数，表示排列次序。 The charging device according to claim 7, wherein said plurality of set current ranges and said corresponding reference voltages comprise {V REF0 , V REF1 , V REF2 , ... arranged in ascending order. V REF(n-1) , V REFn , V REF(n+1) ,...V REF(n+i-1) , V REF(n+i) , V REF(n+i+1) , ...... wherein, in the step of adjusting the reference voltage when the charging current does not match the current set current range, the adjusted reference voltage is the current one of the reference voltages a reference voltage or a subsequent reference voltage, if the charging current is greater than a current set current range, the reference voltage is adjusted to V REF(n+i-1) ; if the charging current is less than a current set current range And adjusting the reference voltage to V REF(n+i+1) , where V REF(n+i) is the current reference voltage, and i and n are positive integers, indicating an arrangement order.
  9. 一种充电校正方法，其特征在于，包括：A charging correction method, comprising:
    输出充电电流与充电电压；Output charging current and charging voltage;
    将对应所述充电电流转换为检测电压，并将所述检测电压与参考电压进行差值比较放大并且获得差值放大信号；Converting the corresponding charging current into a detection voltage, and comparing and comparing the difference between the detection voltage and the reference voltage to obtain a difference amplification signal;
    依据所述差值放大信号输出反馈调整信号；Outputting a feedback adjustment signal according to the difference amplification signal;
    依据所述反馈调整信号调整所述电压端输出的充电电流；Adjusting a charging current output by the voltage terminal according to the feedback adjustment signal;
    判定所述充电电流与当前的设定电流范围是否相互匹配，当所述充电电流与当前的设定电流范围不匹配时，重新获取预先存储的参考电压以调整所述参考电压控制所述差值放大信号以及所述反馈调整信号对应调整，直至所述充电电流与所述当前的设定电流范围匹配。Determining whether the charging current and the current set current range match each other, and when the charging current does not match the current set current range, reacquiring the pre-stored reference voltage to adjust the reference voltage to control the difference The amplified signal and the feedback adjustment signal are correspondingly adjusted until the charging current matches the current set current range.
  10. 根据权利要求9述的充电校正方法，其特征在于，预先存储有多个设定电流范围及其对应的所述参考电压。The charge correction method according to claim 9, wherein a plurality of set current ranges and their corresponding reference voltages are stored in advance.
  11. 根据权利要求9述的充电校正方法，其特征在于，所述多个设定电流范围及其对应的所述参考电压包括按照从小到大的排列的{V REF0，V REF1，V REF2，...V REF(n-1)，V REFn，V REF(n+1)，......V REF(n+i-1)，V REF(n+i)，V REF(n+i+1)，......}，其中，在所述当所述充电电流与当前的设定电流范围不匹配时调整所述参考电压的步骤中，调整后的参考电压为当前所述参考电压前一个参考电压或者后一个参考电压，若所述充电电流大于当前的设定电流范围，将所述参考电压调整为V REF(n+i+1)；若所述充电电流小于当前的设定电流范围，将所述参考电压调整为V REF(n+i-1)，其中，V REF(n+i)为当前所述参考电压，i、n为正整数，表示排列次序。 The charging correction method according to claim 9, wherein said plurality of set current ranges and said corresponding reference voltages comprise {V REF0 , V REF1 , V REF2 , . . . according to an arrangement from small to large. .V REF(n-1) , V REFn , V REF(n+1) , ...V REF(n+i-1) , V REF(n+i) , V REF(n+i +1) , wherein, in the step of adjusting the reference voltage when the charging current does not match the current set current range, the adjusted reference voltage is currently described Reference voltage a previous reference voltage or a subsequent reference voltage, if the charging current is greater than the current set current range, the reference voltage is adjusted to V REF(n+i+1) ; if the charging current is less than the current The current range is set, and the reference voltage is adjusted to V REF(n+i-1) , where V REF(n+i) is the current reference voltage, and i and n are positive integers, indicating an arrangement order.
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