CN116126073A - Output voltage regulating circuit applied to quick charging device and quick charging device - Google Patents
Output voltage regulating circuit applied to quick charging device and quick charging device Download PDFInfo
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- CN116126073A CN116126073A CN202310160033.1A CN202310160033A CN116126073A CN 116126073 A CN116126073 A CN 116126073A CN 202310160033 A CN202310160033 A CN 202310160033A CN 116126073 A CN116126073 A CN 116126073A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the invention provides an output voltage regulating circuit applied to a quick charging device and the quick charging device, wherein the output voltage regulating circuit applied to the quick charging device comprises an intelligent control module and a regulating module, the output end of the intelligent control module is connected with the input end of the regulating module, and three ends in a feedback resistor network of the quick charging device to be regulated are respectively connected to the output voltage end of the quick charging device to be regulated, the feedback end of a voltage reducing circuit of the quick charging device to be regulated and the output end of the regulating module, so that the output voltage of the regulating module is controlled by the intelligent control module, and the output voltage regulation of the quick charging device to be regulated is realized. The invention not only realizes the adjustment of a plurality of output voltage levels of the quick charging device and improves the voltage adjustment precision, but also simplifies the output voltage adjustment circuit and has higher cost performance.
Description
Technical Field
The present invention relates to the field of fast charging devices, and more particularly, to an output voltage adjusting circuit for a fast charging device and a fast charging device.
Background
In the traditional power industry and the mobile phone age with past functions, the output voltage level required by the power adapter is single, and generally only a fixed output voltage is required. For example, the power adapter in the monitoring industry generally requires 12V output voltage, and most of the power adapters for consumer electronics and functional mobile phones generally require 5V output voltage. In the power adapter application of these products, there is no power transfer protocol identification, and no MCU is required to control or intervene on the power chip.
Along with the trend of the design of the mobile phone to be light and thin, the mobile phone does not support the rapid replacement of the battery, and the energy input is completely carried out by depending on the charging and data ports. However, the size of the charging port of the mobile phone is not increased at all, but is instead moving toward continuous miniaturization. The reduction in electrical contact area of the port is accompanied by an increase in contact resistance and a decrease in heat dissipation capacity, which allows the current through the port to be reduced. Input power of port = input voltage = input current. From this, the contradiction between the reduction of the port current capacity and the increase of the port input power can be solved by increasing the port input voltage, which is the original purpose of the Quick Charge technology protocol HVDCP (high voltage dedicated charging port) birth of Quick Charge 2.0 (QC 2.0 for short). QC2.0, on the premise of maximum 2A transmission current, requires the adapter to have voltage outputs of four levels of 5V, 9V, 12V, 20V. The same solution of boosting voltage output is also applied to USB 3.1PD and MTK PUMPEXPRESS PLUS to deliver greater power, thereby realizing fast charging of the cell phone or tablet. In power adapter applications supporting similar fast charge protocols, a related protocol identification chip or MCU is required to control the output voltage of the power supply.
In order to enable the mobile phone to select the most suitable voltage to achieve ideal charging current, further minimize electric energy loss, improve charging efficiency and improve heat performance. New fast charge protocols may require more output voltage levels. Such as QC3.0, requires that its output voltage must be in the range of 3.6-20V, and also requires that in a jump, the variation must be regulated at a voltage amplitude of 200mv per cell. To achieve this function, a more technical solution is currently adopted as shown in fig. 1. The block diagram is a block diagram of a BOOST DCDC circuit, the output end of the block diagram is VOUT (3.36-20V), the voltage is divided by a feedback resistor Rs and R1, the divided voltage VFB is fed back to a BOOST CONTROL circuit, and the output of the output voltage VOUT is automatically regulated by a feedback analog loop. The calculated voltage for VOUT is: vout=vref (Rs/r1+1), where Vref is a reference voltage inside BOOST DCDC. By changing the resistance of Rs, the value of Rs/R1 is changed, and VOUT is changed.
However, to change the Rs value, a set of resistor arrays must be added, and a set of switch tube arrays must be added to select the resistor arrays, which results in an excessive number of switch tubes being required, and the adjusting circuit becomes complicated, and meanwhile, the voltage accuracy of 200mv hops per step is not well ensured.
Disclosure of Invention
In view of the above problems, an embodiment of the present invention provides an output voltage adjusting circuit applied to a fast charging device and a fast charging device, so as to adjust a plurality of output voltage levels of the fast charging device and improve voltage adjusting accuracy.
The output voltage regulating circuit applied to the quick charging device provided by the embodiment of the invention comprises an intelligent control module and a regulating module, wherein the output end of the intelligent control module is connected with the input end of the regulating module, and three ends in a feedback resistor network of the quick charging device to be regulated are respectively connected to the output voltage end of the quick charging device to be regulated, the feedback end of a voltage reducing circuit of the quick charging device to be regulated and the output end of the regulating module, so that the output voltage of the regulating module is controlled by the intelligent control module, and the regulation of the output voltage of the quick charging device to be regulated is realized.
The adjusting module comprises a digital-to-analog converter DAC and a first resistor;
the feedback resistor network of the to-be-regulated quick-charging device comprises a second resistor and a third resistor, one end of the second resistor is connected to the output voltage end of the to-be-regulated quick-charging device, the other end of the second resistor is connected to the feedback end of the voltage reducing circuit of the to-be-regulated quick-charging device, one end of the third resistor is grounded, and the other end of the third resistor is connected to the feedback end of the voltage reducing circuit of the to-be-regulated quick-charging device;
the control input end of the DAC is connected with the intelligent control module, the output end of the DAC is connected with one end of the first resistor, and the other end of the first resistor is connected to the feedback end of the voltage reduction circuit of the to-be-regulated quick-charging device.
Wherein the DAC is an 8-bit voltage output DAC.
And the ADC pin of the intelligent control module is connected with the output voltage end of the to-be-regulated quick charging device.
Wherein, intelligent control module adopts MCU to realize.
The to-be-regulated quick charging device is a BOOSTDCDC power supply module.
In addition, the invention also provides a quick charging device which comprises a voltage dropping circuit, a feedback resistor network and the output voltage regulating circuit applied to the quick charging device.
The output voltage regulating circuit applied to the quick charging device and the quick charging device provided by the embodiment of the invention not only realize the regulation of a plurality of output voltage levels of the quick charging device and improve the voltage regulating precision, but also simplify the output voltage regulating circuit and have higher cost performance.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a prior art output voltage control circuit of QC3.0 fast charge protocol;
fig. 2 is a schematic diagram of an output voltage adjusting circuit applied to a fast charging device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another output voltage adjusting circuit applied to a fast charging device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 2 is a schematic diagram of an output voltage adjusting circuit applied to a fast charging device according to an embodiment of the present invention. As shown in fig. 2, the output voltage adjusting circuit applied to the fast charging device according to the embodiment of the present invention includes an intelligent control module 10 and an adjusting module 20, wherein an output end of the intelligent control module 10 is connected to an input end of the adjusting module 20, and three ends in a feedback resistor network 30 of the fast charging device to be adjusted are respectively connected to an output voltage end vbus_out of the fast charging device to be adjusted, a feedback end VFB of a voltage reducing circuit 40 of the fast charging device to be adjusted, and an output end of the adjusting module 20, so that the output voltage vbus_out of the fast charging device to be adjusted is adjusted by controlling the output end voltage of the adjusting module 20 through the intelligent control module 10.
Wherein, as shown in fig. 3, the adjusting module 20 includes a digital-to-analog converter DAC201 and a first resistor Rdac202 that are intelligently and digitally implemented; the intelligent digital circuit DAC module is characterized in that a PWM controller, a special algorithm module and an intelligent software module integrally realize an analog driving signal with a configurable value; the feedback resistor network 30 of the to-be-regulated fast-charging device comprises a second resistor 301 and a third resistor 302, wherein one end of the second resistor 301 is connected to an output voltage end vbus_out of the to-be-regulated fast-charging device, the other end of the second resistor 301 is connected to a feedback end VFB of the voltage-reducing circuit 40 of the to-be-regulated fast-charging device, one end of the third resistor 302 is grounded, and the other end of the third resistor 302 is connected to a feedback end VFB of the voltage-reducing circuit 40 of the to-be-regulated fast-charging device;
the control input end of the DAC201 is connected with the intelligent control module 10, the output end OUT_DAC of the DAC201 is connected with one end of the first resistor 202, and the other end of the first resistor 202 is connected with the feedback end VFB of the voltage reducing circuit 40 of the to-be-regulated fast-charging device.
Wherein the DAC201 is an 8-bit voltage output DAC.
In practical application, the intelligent control module 10 may be implemented by an MCU, which adjusts the output voltage of the 8-bit voltage output DAC to implement the output voltage adjustment of the to-be-adjusted fast charging device. Specifically, the output voltage of the 8-bit voltage output DAC may have 2 8 The output type is changed, and the purpose that the to-be-regulated quick charging device outputs a specific plurality of grade voltages can be achieved.
The technical scheme of the invention for realizing 200mv regulation of the BOOST DCDC output voltage by using the DAC is taken as an example.
Referring to fig. 3, the feedback resistor network Rs of the BOOST DCDC power supply and the divided voltage VFB of R1 are fed back to the BOOST DCDC module on the left, the right frame is an 8-Bit DAC, the output terminal out_dac of which is connected to the feedback node VFB through a resistor Rdac, and vbus_out (3.6-20V) is the BOOST DCDC output terminal voltage, which is also the output voltage of the discharging terminal of the chip of the fast charging device.
This principle will be explained by a calculation formula.
Setting the reference voltage for reference comparison of the BOOST DCDC to the VFB as VREF, the output middle reference level of the DAC as VCM, and the full swing of the DAC as VPP, wherein when the input of the DAC is all 0, the output voltage of the DAC is VCM-VPP/2; when the DAC inputs are all 1's, the DAC output voltage is VCM+VPP/2.
When the DAC input is set to be all 0, the VBUS_OUT output voltage is set to be 20V; when the DAC input is all 1, the vbus_out output voltage is 3.6V, and according to these 2 setting conditions, the following current equation can be established:
DAC input is all 0, and the current equation is: [ VBUS_OUT (0) -VREF ]/Rs=VREF/R1+ [ VREF- (VCM-VPP/2) ]/Rdac (1)
DAC inputs all 1, the current equation is [ VBUS_OUT (1) -VREF ]/Rs [ (VCM+VPP/2) ]
VREF]/Rdac＝VREF/R1 (2)
Vbus_out (0) =20, vbus_out (1) =3.6 are substituted into the above two formulas respectively, and then formula (1) is subtracted from formula (2), and the two formulas are sorted to obtain:
Rs＝16.4*Rdac/VPP (3)
R1＝VREF*Rdac/[(20-VREF)*VPP – VREF – VCM + VPP/2 ] (4)
for formulas (3) and (4), according to practical application conditions, specific values of VPP, VREF and VCM are substituted, and meanwhile, specific values, such as 20 Kohm, are set for Rdac, so that specific values of Rs and R1 are obtained.
It can be appreciated that in the output voltage range of 3.6-20V of vbus_out, since the DAC used is 8 bits, the minimum step that can be adjusted is calculated to be about 64mV, and the application requirement of the minimum adjustment amplitude of 200mV of the discharge terminal vbus_out of the fast charge protocol QC3.0 can be basically satisfied.
The technical scheme provided by the invention has the advantages of simple calculation formula, simple circuit design, easiness in integration in a chip and capability of well meeting the application requirement of a quick-charge QC3.0 protocol.
In the embodiment of the present invention, the ADC pin of the intelligent control module 10 is connected to the output voltage terminal of the fast charging device to be adjusted. The intelligent control module is realized by an MCU, namely an ADC pin of the MCU is connected with an output voltage end VBUS_OUT of the to-be-regulated quick charging device.
Further, the intelligent control module 10 further comprises a voltage comparison module (not shown in the drawings); the voltage comparison module is used for comparing the output voltage monitored by the ADC pins with a preset output voltage; the intelligent control module is also used for adjusting and controlling the output end voltage of the 8-bit voltage output DAC according to the comparison result of the voltage comparison module, so that the monitoring function of the output voltage is realized.
In an alternative embodiment of the present invention, the output voltage adjusting circuit applied to the fast-charging device further includes a filter capacitor (not shown in the drawing), one end of the filter capacitor is connected to the output voltage terminal vbus_out of the fast-charging device to be adjusted, and the other end of the filter capacitor is connected to the power ground, so as to implement filtering of the output voltage of the fast-charging device to be adjusted.
In the embodiment of the invention, the to-be-regulated quick charging device is a BOOSTDCDC power supply module.
It should be noted that, the output voltage adjusting circuit applied to the fast charging device provided by the embodiment of the present invention is not only applicable to control of boost cdc feedback voltage, but also applicable to control of other types of DCDC feedback voltages, for example, control modes of BUCK DCDC feedback voltage, which is not particularly limited.
In addition, another embodiment of the invention also provides a fast charging device, which comprises a step-down circuit, a feedback resistor network and the output voltage regulating circuit applied to the fast charging device.
In a specific embodiment, the fast charging device comprises a voltage reducing circuit, a feedback resistor network, an intelligent control module, a digital-to-analog converter DAC and a first resistor, wherein the feedback resistor network of the fast charging device to be regulated comprises a second resistor and a third resistor, one end of the second resistor is connected to an output voltage end of the fast charging device to be regulated, the other end of the second resistor is connected to a feedback end of the voltage reducing circuit of the fast charging device to be regulated, one end of the third resistor is grounded, and the other end of the third resistor is connected to a feedback end of the voltage reducing circuit of the fast charging device to be regulated; the control input end of DAC is connected intelligent control, the output of DAC is connected the one end of first resistance, the other end of first resistance is connected to wait to adjust the feedback end of the step-down circuit of quick charge device, quick charge device is in order to pass through intelligent control module control the output voltage of adjustment module realizes to wait to adjust quick charge device's output voltage regulation.
The output voltage regulating circuit applied to the quick charging device and the quick charging device provided by the embodiment of the invention not only realize the regulation of a plurality of output voltage levels of the quick charging device and improve the voltage regulating precision, but also simplify the output voltage regulating circuit and have higher cost performance.
In the description of the present invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (7)
1. The utility model provides an be applied to quick charge device's output voltage regulating circuit, its characterized in that includes intelligent control module and regulating module, intelligent control module's output is connected regulating module's input, treat to adjust the three terminal in quick charge device's the feedback resistance network is connected to respectively treat to adjust quick charge device's output voltage end, treat to adjust quick charge device's step-down circuit's feedback end and regulating module's output, in order to pass through intelligent control module control regulating module's output voltage realizes treating to adjust quick charge device's output voltage regulation.
2. The output voltage regulation circuit for use in a fast-charging apparatus as claimed in claim 1, wherein the regulation module comprises a digital-to-analog converter DAC and a first resistor;
the feedback resistor network of the to-be-regulated quick-charging device comprises a second resistor and a third resistor, one end of the second resistor is connected to the output voltage end of the to-be-regulated quick-charging device, the other end of the second resistor is connected to the feedback end of the voltage reducing circuit of the to-be-regulated quick-charging device, one end of the third resistor is grounded, and the other end of the third resistor is connected to the feedback end of the voltage reducing circuit of the to-be-regulated quick-charging device;
the control input end of the DAC is connected with the intelligent control module, the output end of the DAC is connected with one end of the first resistor, and the other end of the first resistor is connected to the feedback end of the voltage reduction circuit of the to-be-regulated quick-charging device.
3. The output voltage regulating circuit for use in a fast charging apparatus according to claim 2, wherein the DAC is an 8-bit voltage output DAC.
4. The output voltage regulating circuit for a fast-charging device according to any one of claims 1-3, wherein an ADC pin of the intelligent control module is connected to an output voltage terminal of the fast-charging device to be regulated.
5. The output voltage regulating circuit for a fast charging device according to claim 1, wherein the intelligent control module is implemented by an MCU.
6. The output voltage regulator circuit according to any one of claims 1-5, wherein the fast-charging device to be regulated is a boost cdc power supply module.
7. A fast charging device comprising a step-down circuit, a feedback resistor network, and an output voltage regulating circuit according to any one of claims 1-6 for use in a fast charging device.
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| CN202310160033.1A CN116126073A (en) | 2023-02-24 | 2023-02-24 | Output voltage regulating circuit applied to quick charging device and quick charging device |
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| CN115483736A (en) * | 2022-09-21 | 2022-12-16 | 绍兴光大芯业微电子有限公司 | Circuit structure for realizing DC-DC constant current control of mobile phone quick charging |
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2023
- 2023-02-24 CN CN202310160033.1A patent/CN116126073A/en active Pending
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