CN111602310A - Charging device and charging correction method - Google Patents
Charging device and charging correction method Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention relates to a charging device which comprises 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 comprises a power pin and a grounding pin which output charging current and charging voltage. The feedback reference comparison unit compares and amplifies the difference value of the detection voltage corresponding to the charging current and the reference voltage to obtain a difference value amplification signal. And 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. The feedback adjusting unit stores a plurality of set current ranges and corresponding reference voltages, and when the charging current is judged not to be matched with the current set current range, the current reference voltage is adjusted to enable the charging current to be matched with the current set current range. Further, a method for correcting the charging current of the charging device is also disclosed.
Description
The present invention relates to a charging technology, and more particularly, to a charging device and a calibration method capable of accurately adjusting a charging current.
With the wide application of intelligent electronic products, the power consumption of the intelligent electronic products gradually increases with the use time or running programs. Besides increasing the battery capacity of intelligent electronic products, the solution of increasing the power consumption of batteries widely at present is to charge batteries quickly to reduce the charging time.
A common solution when performing fast charging is to increase the charging current, and when the charging current is increased, the voltage applied to the charging adapter, the charging cable, and the electronic device to be charged during charging is also increased accordingly.
In the prior art, in order to ensure charging safety, a charging device usually performs voltage detection on an output charging current, that is, determines whether a power supply output by the charging device is within a preset range by detecting an output voltage in real time. However, in practice, the current charging current output in real time needs to be amplified after being detected, but the bias voltage or error exists in the amplifier, so that the processed charging current has a deviation, and the charging current adjusted according to the deviation cannot accurately reach the preset range, that is, the charging current cannot be accurately controlled.
Disclosure of Invention
The embodiment of the invention discloses a charging device capable of accurately correcting output charging current.
The invention discloses a charging correction method of the charging device.
A charging device comprises 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 comprises a power pin and a grounding pin which are used for outputting charging current and charging voltage. The feedback reference comparison unit is electrically connected with the power supply pin and used for comparing and amplifying the difference value between the detection voltage corresponding to the charging current and the reference voltage and obtaining a difference value amplification signal. The feedback control unit is electrically connected with the feedback reference comparison unit and used for outputting a feedback adjustment signal according to the difference amplification signal. And the switch control unit is electrically connected with the power supply input end, the voltage pin and the feedback control unit. The switch control unit is used for receiving a direct current power supply from a power supply input end, converting a first current in the direct current power supply into a charging current and outputting the charging current to the power supply pin, and adjusting the charging current according to the feedback adjusting signal. The feedback adjusting unit stores a plurality of set current ranges and the reference voltage corresponding to each set current range, judges whether the charging current is matched with the current set current range, and when the charging current is not matched with the current set current range, acquires the prestored reference voltage again to adjust the reference voltage to control the difference value amplification signal and the feedback adjusting signal to be adjusted correspondingly until the charging current is matched with the current set current range.
A charge correction method, comprising:
outputting a charging current and a charging voltage;
converting the corresponding charging current into a detection voltage, comparing and amplifying the difference value of the detection voltage and a reference voltage, and obtaining a difference value amplification signal;
outputting a feedback adjustment signal according to the difference amplification signal;
adjusting the charging current output by the voltage end according to the feedback adjusting signal;
and judging whether the charging current is matched with the current set current range, and when the charging current is not matched with the current set current range, re-acquiring a pre-stored reference voltage to adjust the reference voltage to control the difference value amplification signal and the feedback adjustment signal to be correspondingly adjusted until the charging current is matched with the current set current range.
Compared with the prior art, the reference voltage can be completely adjusted in real time according to the charging current currently and actually output by the power supply end, so that the disturbance influence of the input bias voltage on the amplifier in the feedback reference comparison unit can be counteracted through the reference voltage, the charging current can be ensured to be accurately positioned in a set current range, and meanwhile, the bias voltage of the first amplifier is not required to be limited specially for reducing the disturbance influence of the bias voltage, so that the cost of the first amplifier is reduced.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a charging device.
Fig. 2 is a flowchart illustrating a charging calibration method performed by the charging device shown in fig. 1.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes the specific structure of the charging device with reference to the drawings.
As shown in fig. 1, the charging device 10 is used for converting an ac power into a dc power and transmitting the dc power to an electronic device (not shown) through a charging cable (not shown), so as to charge the electronic device. The DC power supply includes a charging voltage and a charging current.
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.
The charging input end 101 is electrically connected to an ac power source to receive an ac electrical signal, and the converting circuit 102 is electrically connected between the charging input end 101 and the power output interface 103 to convert the ac electrical signal into a dc electrical signal, where the dc electrical signal includes a first current.
In this embodiment, the power output interface 103 in the charging device 10 is a USB charging interface, and includes a power pin Vbus, a ground pin G1, a first data pin D1 and a second data pin D2, the power pin Vbus and the ground pin G1 are used for transmitting a charging voltage and a charging current IL, and the first data pin D1 and the second data pin D2 are used for transmitting data signals.
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, and is configured to correct the charging current in the dc power source output by the conversion processing circuit so as to obtain the charging current output from the power output interface 103, so that the charging current is within a set current range.
The correction circuit comprises 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 detection unit 11 is electrically connected to the power output UO, and is configured to convert the charging current IL into a detection voltage Vis.
The feedback reference comparing unit 12 is electrically connected to the detecting unit 11, and is used for comparing the detected voltage Vis with the reference voltage VREFComparative amplification is performed and an amplified signal of the difference is obtained.
The feedback control unit 13 is electrically connected to the feedback reference comparing unit 12, and configured to output a feedback adjustment signal according to the difference amplification signal.
The switch control unit 14 is electrically connected to the power input end UI, the power output end UO and the feedback control unit 13. The switch control unit 14 receives a dc power from a power input terminal UI, converts a first current in the dc power into a charging current, outputs the charging current to the power output terminal UO of the power pin Vbus, adjusts the charging current according to the feedback adjustment signal received from the feedback control unit 13, and makes the adjusted charging current be within a set current range.
The feedback adjusting unit 15 is electrically connected to the detecting unit 11 and the feedback reference comparing unit 12.
The feedback adjustment unit 15 stores a plurality of setting current ranges and the reference voltages corresponding thereto in advance, and can receive an external operation command to set a current required settingAnd (4) setting the current range. When the charging current output by the voltage pin Vbus connected to the voltage output terminal UO is IL, the feedback adjustment unit 15 determines whether the charging current IL matches the current set current range. When the charging current IL does not match the current setting current range, the feedback adjusting unit 15 adjusts the currently adopted reference voltage VREFAnd controlling the difference amplification signal and the feedback adjustment signal to be correspondingly adjusted until the charging current IL is matched with the current set current range.
Specifically, the detection unit 11 includes a detection input terminal 111, a first detection resistance RL, a second detection resistance Ris, and a detection output terminal 112. The detection input end 111 is electrically connected to the power output end UO, the first detection resistor RL is electrically connected to the power input end UI and the detection output end 112, and the second detection resistor Ris is electrically connected between the detection output end 112 and the ground end GND. The first detection resistor RL and the second detection resistor Ris are connected in series between the power input end UO and the ground end GND, and are used for converting the charging current IL into a detection voltage Vis. Then, the relationship between the detection voltage Vis output from the detection output terminal 112 and the charging current IL is: Vis-Ris IL Ris.
The feedback reference comparing unit 12 includes a first amplifying unit 121 and a second amplifying unit 122, the first amplifying unit 121 is configured to amplify the detection voltage Vis in a forward direction, and the second amplifying unit 122 is configured to compare the amplified detection voltage Vis with the reference voltage VREF and perform scaling amplification, so as to perform difference 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, wherein the first amplifier OP1 includes a first non-inverting terminal IN +1, a first inverting terminal IN-1 and a first amplifying output terminal O1. The first non-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 a ground terminal GND through the first feedback resistor R1, and the first reference resistor R2 is electrically connected to the first inverting terminal IN-1 and the first amplifying output terminal O1.
The first mentionedThe two amplifying units 122 include 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. A second IN-phase terminal IN +2 electrically connected to the first amplified output O1 and configured to receive the amplified detection voltage Vis, and a second inverting terminal electrically connected to the feedback adjustment unit 15 and configured to receive the reference voltage VREFAnd the second amplification output end O2 is used for outputting the difference amplification signal.
Specifically, the working processes of the first amplifying unit 121 and the second amplifying unit 122 are as follows:
the charging current IL flows through the first detecting resistor RL and the second detecting resistor Ris in the detecting unit 11, and then the detecting voltage Vis output from the detecting output terminal 112 is: Vis-Ris.
The first amplifying unit 121 performs forward amplification processing on the detection voltage Vis, and the detection potential Vis after the amplification processing is: (Vis-Vos) (1+ R2/R1), where Vos is the input bias voltage of the first amplifier OP 1.
The second amplifying unit 122 amplifies the amplified detected voltage Vis and the reference voltage VREFPerforming difference comparison amplification and obtaining a difference amplification signal as follows: ((Vis-Vos) (1+ R2/R1) -VREF) × Q, where Q is the intrinsic amplification factor of the second amplifier OP 2.
The feedback control unit 13 is a negative feedback circuit that sets and adjusts a PWM signal duty ratio in accordance with the difference amplification signal, and sets the PWM signal whose duty ratio is adjusted by the difference amplification signal as the feedback adjustment signal.
The switch control unit 14 may be a PWM pulse width modulation circuit, and adjusts the first current by setting a PWM signal with an adjusted duty ratio to obtain a corrected charging current IL, so that the charging current IL is in a set current range.
The feedback adjusting unit 15 includes a converting unit 151, a storage unit 152, a reference voltage generating unit 153, and a control unit 154. The conversion unit 151 is used to convert 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 setting current ranges and the reference voltage corresponding to each setting current range.
Specifically, the plurality of setting current ranges and the reference voltages corresponding thereto may be arranged in an order from small to large:
{IL0，IL1，IL2，...IL(n-1)，ILn，IL(n+1)，...，IL(n+i-1)，IL(n+i)，IL(n+i+1)，......}
{VREF0，VREF1，VREF2，...VREF(n-1)，VREFn，VREF(n+1)，...，VREF(n+i-1)，VREF(n+i)，VREF(n+i+1),.., wherein i, n are positive integers, and both i, n represent rank order. It can be understood that the arrangement order of the current ranges and the reference voltage V are setREFAre arranged in the same order and the same arrangement positions correspond to each other, i.e. IL0Corresponds to VREF0，IL1Corresponds to VREF1，......，IL(n+i)Corresponds to VREF(n+i)And so on.
The control unit 154 is used for reading the digital charging current IL output by the conversion unit 151 and the current setting current range stored in the storage unit 152, and comparing the two. When the charging current IL is not within the current set current range, it indicates that the charging current IL is not matched with the current set current range, and the reference voltage V needs to be adjustedREFI.e. adjusting the present reference voltage VREF(n+i)To a reference voltage V ordered before itREF(n+i-1)Or a reference voltage V arranged in sequenceREF(n+i+1). Specifically, if the charging current IL is larger than the current setting current range, the reference voltage V is read from the memory cell 152 againREF(n+i+1)Instead of the present reference voltage VREF(n+i)(ii) a If the charging current IL is smaller than the current setting current range, the reference voltage V is read from the storage unit 152 againREF(n+i-1)Instead of the present reference voltage VREF(n+i)。
The reference voltage generating unit 153 passes through I2A C data transmission line electrically connected to the memory unit 152 for generating a corresponding reference voltage V in the form of an analog voltage according to the reference voltage valueREF. In this embodiment, the reference voltage generating unit 153 is a digital adjustable potentiometer (e.g., a digital adjustable resistor), which adjusts an output resistance of the adjustable resistor according to the reference voltage value read from the storage unit 152 to adjust the output reference voltage VREF。
Please refer to fig. 2, which is a flowchart illustrating a charging calibration method of the charging apparatus shown in fig. 1.
Specifically, the charging current IL flows through the first detection resistor RL and the second detection resistor Ris in the detection unit 11, and then the detection voltage Vis output from the detection output terminal 112 is: Vis-Ris IL Ris.
The first amplifying unit 121 performs forward amplification processing on the detection voltage Vis, and the detection potential Vi after the amplification processing is:
(Vis-Vos) (1+ R2/R1), where Vos is the input bias voltage of the first amplifier OP 1.
The second amplifying unit 122 performs difference comparison amplification on the detection voltage and the reference voltage and obtains a difference amplified signal as: ((Vis-Vos) (1+ R2/R1) -VREF) × Q, where Q is the intrinsic amplification factor of the second amplifier OP 2.
The feedback control unit 13 adjusts the duty ratio of the PWM signal according to the difference amplification signal.
The switch control unit 14 adjusts the charging current IL output by the power output UO according to the PWM signal, and transmits the corrected and adjusted charging current IL to the power pin Vbus through the power output UO.
That is, when the IL charging current does not match the current set current range, the prestored reference voltage V is retrievedREFAnd adjusting the reference voltage to control the difference amplification signal and the feedback adjustment signal to be correspondingly adjusted until the charging current is matched with the current set current range.
Specifically, the conversion unit 151 in the feedback adjustment unit 15 converts the current charging current IL into a digital form, and then compares the digital form with the current setting current range IL (n + i) in the storage unit 152, and it can be understood that the reference voltage corresponding to the current setting current range IL (n + i) is also VREF(n+i)。
When the charging current IL matches the current set current range IL (n + i), i.e. IL is within the current set current range IL (n + i), i.e. represents the current reference voltage VREF(n+i)The charging current IL can be guaranteed to be in a required range for a reference voltage suitable for the currently output charging current IL.
When the charging current IL is not matched with the current set current range IL (n + i), namely when the charging current IL is not in the current set current range, adjusting the reference voltage VREFI.e. adjusting the present reference voltage VREF(n+i)To a reference voltage V ordered before itREF(n+i-1)Or a reference voltage V arranged in sequenceREF(n+i+1)。
Specifically, if the charging current is larger than the current set current range, the self-memory list is restoredRead reference voltage V in cell 152REF(n+i+1)Instead of the present reference voltage VREF(n+i)(ii) a If the charging current is smaller than the current setting current range, the reference voltage V is read from the storage unit 152 againREF(n+i-1)In place of the current reference voltage VREF(n+i)。
The adjusted reference voltage is a reference voltage V which is previous to the current reference voltageREF(n+i-1)Or a latter reference voltage VREF(n+i-1). Specifically, if the charging current IL is larger than the current setting current range IL (n + i), the reference voltage is adjusted to VREF(n+i-1)(ii) a If the charging current is smaller than the current set current range, the reference voltage is adjusted to be VREF(n+i+1)。
Compared with the prior art, the reference voltage VREFCan be completely adjusted in real time according to the currently actually output charging current IL of the power supply pin Vbus, thereby being capable of passing through the reference voltage VREFThe disturbance influence of the input bias voltage Vos of the first amplifier OP1 in the first amplifying unit 121 is offset, so that the charging current IL can be ensured to be accurately within the set current range, and meanwhile, the bias voltage Vos of the first amplifier OP1 does not need to be limited specially for reducing the disturbance influence of the bias voltage Vos, so that the cost of the first amplifier OP1 is reduced.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (11)
- A charging device is characterized in that a charging device is provided,the power output interface comprises a power pin and a grounding pin which are used for outputting charging current and charging voltage;the feedback reference comparison unit is electrically connected with the power supply pin and is used for comparing and amplifying the difference value between the detection voltage corresponding to the charging current and the reference voltage and obtaining a difference value amplification signal;the feedback control unit is electrically connected with the feedback reference comparison unit and used for amplifying a signal according to the difference value and outputting a feedback adjustment signal;the switch control unit is electrically connected with the power supply input end, the voltage pin and the feedback control unit, and is used for receiving a direct-current power supply from the power supply input end, converting a first current in the direct-current power supply into a charging current and outputting the charging current to the power supply pin, and adjusting the charging current according to the feedback adjustment signal;the feedback adjusting unit is used for storing a plurality of set current ranges and the reference voltage corresponding to each set current range, judging whether the charging current is matched with the current set current range or not, and when the charging current is not matched with the current set current range, re-acquiring the pre-stored reference voltage to adjust the reference voltage to control the difference value amplification signal and the feedback adjusting signal to be correspondingly adjusted until the charging current is matched with the current set current range.
- The charging device of claim 1, wherein the feedback adjustment unit receives an external input operation to set the current setting current range, and outputs the reference voltage according to the current setting current range.
- The charging device according to claim 2, wherein the feedback adjustment unit includes a conversion unit, a storage unit, a control unit, and a reference voltage generation unit, the conversion unit is used for converting the charging current into a digital form, the storage unit is used for storing a plurality of setting current ranges and the reference voltage value corresponding to each setting current range, the control unit is used for comparing and dividing the charging current and the current setting current range, when the charging current is not in the current set current range, the charging current is not matched with the current set current range, the reference voltage is read from the storage unit again and output to the reference voltage generating unit, the reference voltage generating unit is electrically connected with the storage unit and used for generating corresponding reference voltages in the form of analog voltages according to the reference voltage values.
- The charging device according to claim 1, wherein the feedback reference comparison unit includes a first amplification unit and a second amplification unit, the first amplification unit is configured to amplify the detection voltage in a forward direction, and the second amplification unit is configured to compare the amplified detection voltage with the reference voltage and perform inverse scaling amplification to perform difference comparison amplification to obtain the difference amplification signal.
- 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, the first amplifier comprises a first in-phase terminal, a first inverting terminal and a first amplifying output terminal, the first in-phase terminal is electrically connected to the first input resistor and receives the detection voltage, the first inverting terminal is electrically connected to a ground terminal through the first feedback resistor, and the first reference resistor is electrically connected to the first inverting terminal and the first amplifying output terminal;the second amplifying unit comprises a second amplifier, the second amplifier comprises a second in-phase end, a second inverting end and a second amplifying output end, the second in-phase end is electrically connected with the first amplifying output end and used for receiving the amplified detection voltage, the second inverting end is electrically connected with the feedback adjusting unit and used for receiving the reference voltage, and the second amplifying output end is used for outputting the difference amplifying signal.
- The charging device according to claim 1, wherein the feedback control unit is a negative feedback circuit that sets a duty ratio of the PWM signal according to the difference amplification signal and uses the PWM signal with the set duty ratio as the feedback adjustment signal.
- The charging device according to any one of claims 1 to 6, further comprising a detection unit for converting the charging current into a detection voltage, wherein the detection unit comprises a detection input terminal, a first detection resistor, a second detection resistor, and a detection output terminal, the detection input terminal is electrically connected to the power pin, the first detection resistor is electrically connected to the power terminal and the detection output terminal, and the second detection resistor is electrically connected between the detection output terminal and a ground terminal.
- The charging device of claim 7, wherein the plurality of set current ranges and the corresponding reference voltages comprise { V in a small-to-large arrangementREF0，VREF1，VREF2，...VREF(n-1)，VREFn，VREF(n+1)，...VREF(n+i-1)，VREF(n+i)，VREF(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 a previous reference voltage or a next reference voltage of the current reference voltage, and if the charging current is larger than the current set current range, the reference voltage is adjusted to be VREF(n+i-1)(ii) a If the charging current is smaller than the current set current range, the reference voltage is adjusted to be VREF(n+i+1)Wherein V isREF(n+i)For the reference voltage, i and n are positive integers, and represent the arrangement order.
- A charge correction method, comprising:outputting a charging current and a charging voltage;converting the corresponding charging current into a detection voltage, comparing and amplifying the difference value of the detection voltage and a reference voltage, and obtaining a difference value amplification signal;outputting a feedback adjustment signal according to the difference amplification signal;adjusting the charging current output by the voltage end according to the feedback adjusting signal;and judging whether the charging current is matched with the current set current range, and when the charging current is not matched with the current set current range, re-acquiring a pre-stored reference voltage to adjust the reference voltage to control the difference value amplification signal and the feedback adjustment signal to be correspondingly adjusted until the charging current is matched with the current set current range.
- The charge correction method according to claim 9, wherein a plurality of setting current ranges and the reference voltages corresponding thereto are stored in advance.
- The charge correction method of claim 9, wherein the plurality of set current ranges and the corresponding reference voltages thereof comprise { V in a small-to-large arrangementREF0，VREF1，VREF2，...VREF(n-1)，VREFn，VREF(n+1)，......VREF(n+i-1)，VREF(n+i)，VREF(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 a previous reference voltage or a next reference voltage of the current reference voltage, and if the charging current is larger than the current set current range, the reference voltage is adjusted to be VREF(n+i+1)(ii) a If the charging current is smaller than the current set current range, the reference voltage is adjusted to be VREF(n+i-1)Wherein V isREF(n+i)For the reference voltage, i and n are positive integers, and represent the arrangement order.
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| PCT/CN2018/075157 WO2019148460A1 (en) | 2018-02-02 | 2018-02-02 | Charging apparatus and charging correction method |
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|---|---|---|---|---|
| CN112072762A (en) * | 2020-11-10 | 2020-12-11 | 北京思凌科半导体技术有限公司 | Charging circuit and power terminal |
| CN112072762B (en) * | 2020-11-10 | 2021-01-29 | 北京思凌科半导体技术有限公司 | Charging circuit and power terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019148460A1 (en) | 2019-08-08 |
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Address after: 518172 43 Universiade Software Town, 8288 Longgang Avenue, Henggang Street, Longgang District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Ruoyu Technology Co.,Ltd. Address before: 518172 43 Universiade Software Town, 8288 Longgang Avenue, Henggang Street, Longgang District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN ROYOLE TECHNOLOGIES Co.,Ltd. |
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Application publication date: 20200828 |