CN106451581B - Voltage drop control method and device, voltage drop controller and charging equipment - Google Patents
Voltage drop control method and device, voltage drop controller and charging equipment Download PDFInfo
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- CN106451581B CN106451581B CN201510483950.9A CN201510483950A CN106451581B CN 106451581 B CN106451581 B CN 106451581B CN 201510483950 A CN201510483950 A CN 201510483950A CN 106451581 B CN106451581 B CN 106451581B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention provides a voltage drop control method, a voltage drop control device, a voltage drop controller and charging equipment, wherein the method comprises the following steps: detecting a voltage drop value across a current limiting switch for limiting an output current in a charging device, wherein the charging device is used for charging a predetermined terminal; when the voltage drop value of the two ends of the current limiting switch is detected to exceed a preset threshold value, the output voltage of the direct current-to-direct current DCDC power converter in the charging equipment is adjusted, so that the voltage drop of the two ends of the current limiting switch is smaller than or equal to the preset threshold value. The invention solves the problems of large power consumption of the current-limiting switch and short service life of the charging equipment in the related technology, thereby achieving the effects of reducing the power consumption of the current-limiting switch and prolonging the service life of the charging equipment.
Description
Technical Field
The invention relates to the field of communication, in particular to a voltage drop control method and device, a voltage drop controller and charging equipment.
Background
With the development of communication terminals, portable mobile charging devices such as power adapters and mobile power supplies for charging terminals have also been widely used. In order to prevent safety problems caused by heat generation and large-current charging, many power adapters and mobile charging devices limit output currents, such as 1A, 500mA, and the like. In these current limiting methods, a circuit using a current limiting switch is used in a large part. The current-limiting switch is substantially equal to a Metal Oxide Semiconductor (MOS) field effect transistor, and within a current-limiting set value, the MOS transistor is fully conducted, and the voltage drop is small; when the current required by the load exceeds a set value, the internal resistance of the current-limiting switch MOS tube is increased to limit the current to the set value.
Since the internal resistance of the current limiting switch is increased during current limiting, the power consumption of the current limiting switch will also be increased. Examples are as follows: if the output power of a mobile power supply is limited to 5V/1A, the output power is 5W at the maximum, and the maximum loading is 5 omega. When a certain terminal needs 5V/1.25A current (i.e. load 4 Ω) during charging, the mobile power supply can only output 1A current due to the effect of the current limiting switch, and the voltage applied to the terminal is 1A × 4 Ω -4V, and the power is 4W, which means that there is a voltage drop of 5V-4V-1V across the current limiting switch. Since the output power of the mobile power supply is 5V × 1A — 5W, this means that 1W of the output power is consumed by the current limiting switch. The power consumption of 1W is consumed while the device is heated, which brings about a great hidden trouble to the equipment safety. Therefore, the related art has the problems that the power consumption of the current-limiting switch is large and the service life of the device is reduced.
Aiming at the problems of large power consumption of a current-limiting switch and short service life of charging equipment in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a voltage drop control method and device, a voltage drop controller and charging equipment, and aims to at least solve the problems that the power consumption of a current-limiting switch is high and the service life of the charging equipment is short in the related technology.
According to an aspect of the present invention, there is provided a pressure drop control method, including: detecting a voltage drop value across a current limiting switch for limiting an output current in a charging device, wherein the charging device is used for charging a predetermined terminal; when the voltage drop value of the two ends of the current limiting switch is detected to exceed a preset threshold value, the output voltage of a direct current-to-direct current (DCDC) power converter in the charging equipment is adjusted, so that the voltage drop of the two ends of the current limiting switch is smaller than or equal to the preset threshold value.
Optionally, adjusting the output voltage of the DCDC power converter in the charging device comprises: adjusting the output voltage of the DCDC power converter by adjusting a feedback voltage of a feedback FB pin in the DCDC power converter.
Optionally, the feedback voltage of the FB pin in the DCDC power converter is adjusted by: outputting a predetermined voltage to a base of a triode, wherein a collector and an emitter of the triode are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used for changing a voltage dividing ratio of the voltage dividing resistance network by changing impedance between the collector and the emitter; and adjusting the feedback voltage of the FB pin by changing the voltage division ratio of the voltage division resistance network.
Optionally, the outputting the predetermined voltage to the base of the triode comprises: determining the preset voltage according to the detected voltage drop value at the two ends of the current limiting switch; outputting the determined predetermined voltage to the base of the triode; and/or converting the voltage drop at two ends of the current limiting switch into single-ended output; processing the voltage output by the single end by using an inverse proportion operational amplifier circuit to obtain the preset voltage; and outputting the obtained preset voltage to the base electrode of the triode.
Optionally, adjusting the output voltage of the DCDC power converter by adjusting the feedback voltage of the FB pin in the DCDC power converter comprises: reducing the output voltage of the DCDC power converter by increasing the feedback voltage of the FB pin in the DCDC power converter.
According to another aspect of the present invention, there is provided a pressure drop control device including: the detection module is used for detecting a voltage drop value at two ends of a current limiting switch used for limiting output current in charging equipment, wherein the charging equipment is used for charging a preset terminal; and the adjusting module is used for adjusting the output voltage of the DC-DC power converter in the charging equipment when the voltage drop value of the two ends of the current-limiting switch is detected to exceed a preset threshold value, so that the voltage drop of the two ends of the current-limiting switch is smaller than or equal to the preset threshold value.
Optionally, the adjusting module includes: the adjusting unit is used for adjusting the output voltage of the DCDC power converter by adjusting the feedback voltage of a feedback FB pin in the DCDC power converter.
Optionally, when adjusting the feedback voltage of the FB pin in the DCDC power converter, the adjusting unit includes: an output subunit, configured to output a predetermined voltage to a base of a triode, wherein a collector and an emitter of the triode are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used to change a voltage dividing ratio of the voltage dividing resistance network by changing an impedance between the collector and the emitter; and the adjusting subunit is used for adjusting the feedback voltage of the FB pin by changing the voltage division ratio of the voltage division resistor network.
Optionally, the output subunit includes: the determining secondary subunit is used for determining the preset voltage according to the detected voltage drop value at the two ends of the current limiting switch; the first output subunit is used for outputting the determined preset voltage to the base electrode of the triode; and/or, a conversion subunit, configured to convert a voltage drop across the current-limiting switch into a single-ended output; the processing secondary subunit is used for processing the voltage output by the single end by using an inverse proportion operational amplifier circuit to obtain the preset voltage; and the second output subunit is used for outputting the obtained preset voltage to the base electrode of the triode.
Optionally, the adjusting unit includes: reducing the output voltage of the DCDC power converter by increasing the feedback voltage of the FB pin in the DCDC power converter.
According to another aspect of the present invention there is provided a pressure drop controller comprising the apparatus of any one of the above.
According to another aspect of the present invention, there is provided a charging apparatus including a current limiting switch, a dc-to-dc DCDC power converter, and the voltage drop controller, wherein the current limiting switch is configured to limit an output current; the DCDC power converter is connected to the current-limiting switch and is used for providing output voltage for the current-limiting switch; the voltage drop controller is connected to the current limiting switch and the DCDC power converter.
According to the invention, the voltage drop value of two ends of a current limiting switch used for limiting output current in charging equipment is detected, wherein the charging equipment is used for charging a preset terminal; when the voltage drop value of the two ends of the current limiting switch is detected to exceed a preset threshold value, the output voltage of a direct current-to-direct current (DCDC) power converter in the charging equipment is adjusted, so that the voltage drop of the two ends of the current limiting switch is smaller than or equal to the preset threshold value. The problems that the power consumption of a current-limiting switch is large and the service life of the charging equipment is short in the related technology are solved, and the effects of reducing the power consumption of the current-limiting switch and prolonging the service life of the charging equipment are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a pressure drop control method according to an embodiment of the invention;
fig. 2 is a block diagram of a pressure drop control apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram of the structure of the adjustment module 24 in the pressure drop control device according to the embodiment of the present invention;
fig. 4 is a block diagram of the structure of the adjusting unit 32 in the pressure drop control device according to the embodiment of the present invention;
fig. 5 is a block diagram of an output subunit 42 in the pressure drop control device according to the embodiment of the present invention;
fig. 6 is a block diagram of a voltage drop controller according to an embodiment of the present invention;
fig. 7 is a block diagram of a structure of a charging apparatus according to an embodiment of the present invention;
FIG. 8 is a circuit diagram for regulating the voltage drop across a current limit switch using a single chip microcomputer control system in accordance with an embodiment of the present invention;
fig. 9 is a circuit diagram for regulating the voltage drop across a current limit switch using an integrated op-amp control system in accordance with an embodiment of the present invention;
fig. 10 is a flowchart of a method for reducing power consumption of a DCDC current-limited output according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In the present embodiment, a pressure drop control method is provided, and fig. 1 is a flowchart of a pressure drop control method according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
step S102, detecting a voltage drop value of two ends of a current limiting switch used for limiting output current in charging equipment, wherein the charging equipment is used for charging a preset terminal;
step S104, when it is detected that the voltage drop across the current-limiting switch exceeds a predetermined threshold, adjusting the output voltage of the dc-dc power converter in the charging device so that the voltage drop across the current-limiting switch is less than or equal to the predetermined threshold.
Through the steps, the voltage drop at two ends of the current limiting switch can be kept within the preset threshold value by adjusting the output voltage of the DCDC power converter, so that excessive power consumption of the current limiting switch is avoided, the problems that the current limiting switch in the related technology is large in power consumption and the service life of the charging equipment is short are solved, and the effects of reducing the power consumption of the current limiting switch and prolonging the service life of the charging equipment are achieved.
In an alternative embodiment, the adjusting the output voltage of the DCDC power converter in the charging device includes: the output voltage of the DCDC power converter is adjusted by adjusting a feedback voltage of a Feedback (FB) pin in the DCDC power converter. There are many ways to adjust the feedback voltage of the FB pin in the DCDC power converter, which are exemplified below:
in an alternative embodiment, the feedback voltage of the FB pin in the DCDC power converter can be adjusted as follows: outputting a predetermined voltage to a base of a triode, wherein a collector and an emitter of the triode are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used for changing a voltage dividing ratio of the voltage dividing resistance network by changing impedance between the collector and the emitter; and adjusting the feedback voltage of the FB pin by changing the voltage division ratio of the voltage division resistor network.
In an alternative embodiment, outputting the predetermined voltage to the base of the transistor includes: determining the preset voltage according to the detected voltage drop value at the two ends of the current limiting switch; outputting the determined predetermined voltage to a base of the triode; and/or, converting the voltage drop at two ends of the current-limiting switch into single-ended output; processing the voltage output by the single end by using an inverse proportion operational amplifier circuit to obtain the preset voltage; and outputting the obtained preset voltage to the base of the triode. It should be noted that the two manners described above are merely examples, and other manners may be adopted to output the predetermined voltage to the base of the transistor, which are not listed here.
In an alternative embodiment, adjusting the output voltage of the DCDC power converter by adjusting the feedback voltage of the FB pin of the DCDC power converter includes: the output voltage of the DCDC power converter is reduced by increasing the feedback voltage of the FB pin in the DCDC power converter.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a pressure drop control device is further provided, and the device is used to implement the above embodiments and preferred embodiments, which have already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram illustrating a structure of a pressure drop control apparatus according to an embodiment of the present invention, which includes a detection module 22 and an adjustment module 24, as shown in fig. 2, and will be described below.
A detection module 22, configured to detect a voltage drop across a current limit switch in a charging device, where the current limit switch is used to limit an output current, and the charging device is used to charge a predetermined terminal; and an adjusting module 24, connected to the detecting module 22, for adjusting an output voltage of the dc-dc power converter in the charging device when it is detected that the voltage drop across the current-limiting switch exceeds a predetermined threshold, so that the voltage drop across the current-limiting switch is less than or equal to the predetermined threshold.
Fig. 3 is a block diagram of a structure of an adjusting module 24 in a pressure drop control device according to an embodiment of the present invention, and as shown in fig. 3, the adjusting module 24 includes an adjusting unit 32, and the adjusting module 24 is described below.
And an adjusting unit 32, configured to adjust an output voltage of the DCDC power converter by adjusting a feedback voltage of the feedback FB pin in the DCDC power converter.
Fig. 4 is a block diagram of a structure of the adjusting unit 32 in the voltage drop control device according to the embodiment of the present invention, where the adjusting unit 32 includes an output sub-unit 42 and an adjusting sub-unit 44 when adjusting the feedback voltage of the FB pin in the DCDC power converter, and the adjusting unit 32 is explained below.
An output subunit 42, configured to output a predetermined voltage to a base of a transistor, wherein a collector and an emitter of the transistor are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used to change a voltage dividing ratio of the voltage dividing resistance network by changing an impedance between the collector and the emitter; and an adjusting subunit 44, connected to the output subunit 42, for adjusting the feedback voltage of the FB pin by changing the voltage dividing ratio of the voltage dividing resistor network.
Fig. 5 is a block diagram illustrating the structure of the output subunit 42 in the voltage drop control device according to the embodiment of the present invention, and as shown in fig. 5, the output subunit 42 includes a determination subunit 52 and a first output subunit 54; and/or the output sub-unit 42 comprises a conversion sub-unit 56, a processing sub-unit 58 and a second output sub-unit 510, which will be described below for the output sub-unit 42.
A determining sub-unit 52 for determining a predetermined voltage according to the detected voltage drop across the current limit switch; a first output sub-unit 54 connected to the determining sub-unit 52 for outputting the determined predetermined voltage to the base of the transistor; and/or, the conversion subunit 56 is configured to convert a voltage drop across the current-limiting switch into a single-ended output; a processing subunit 58, connected to the converting subunit 56, for processing the voltage outputted from the single end by using the inverse proportion operational amplifier circuit to obtain the predetermined voltage; and a second output sub-unit 510, connected to the processing sub-unit 58, for outputting the obtained predetermined voltage to the base of the triode.
In an alternative embodiment, the adjusting unit 32 includes: the output voltage of the DCDC power converter is reduced by increasing the feedback voltage of the FB pin in the DCDC power converter.
Fig. 6 is a block diagram of a pressure drop controller according to an embodiment of the present invention, and as shown in fig. 6, the pressure drop controller 62 includes any one of the pressure drop control devices 64 described above.
Fig. 7 is a block diagram showing the configuration of a charging apparatus according to an embodiment of the present invention, which includes a current limit switch 72, a DCDC power converter 74, and the above-described voltage drop controller 62, as shown in fig. 7, and will be described below.
The current limiting switch 72 is used to limit the output current; a DCDC power converter 74 connected to the current limiting switch 72 for providing an output voltage to the current limiting switch 72; the voltage drop controller 62 is connected to the current limit switch 72 and the DCDC power converter 74.
It can be known from the foregoing embodiments that the implementation method for reducing power consumption of DCDC current-limiting output provided in the embodiments of the present invention collects voltage drops at two ends of a current-limiting switch in real time, and when the voltage drop exceeds a set threshold, the feedback regulating circuit adjusts FB feedback voltage of the DCDC circuit to reduce output voltage of the DCDC circuit, thereby reducing voltage drops at two ends of the current-limiting switch and achieving the purpose of reducing power consumption. Again using the above example to illustrate: when the output of the mobile power supply is limited to 5V/1A, the terminal load is 4 omega. According to the above calculation, the voltage drop across the current limiting switch is 1V and the voltage across the terminals is 4V. At this point, the feedback regulation circuit collects the voltage drop across the current limit switch (assuming that the threshold set by the voltage drop is 0.1V). Because the voltage drop of the current-limiting switch is larger than the set threshold, the feedback regulating circuit regulates the FB feedback voltage on the DCDC, so that the output voltage of the DCDC is reduced until 4.1V, the set threshold condition is met, and the regulation is stopped. At this time, the DCDC output power consumption is 4.1V × 1A to 4.1W, the power consumption applied to the terminating load is 4V × 1A to 4W, the power loss on the current limit switch is only 0.1W, and the power consumption is reduced by 90%.
In the above embodiment, when detecting the voltage drop value across the current limiting switch in the charging device, the voltage drop needs to be collected, wherein the voltage drop across the current limiting switch may be collected by using a signal collecting circuit (corresponding to the above-mentioned detecting module 22). This signal acquisition circuit can be used in a wide variety of applications, such as: Analog-to-Digital Converter (ADC for short) signal acquisition, conversion using integrated operational amplifiers, conversion using a resistor network plus a single chip microcomputer (or other programmable control processor), and the like.
When the output voltage of the DCDC power converter is adjusted, a signal conditioning circuit (corresponding to the above-mentioned adjusting module 24) may be used to adjust, and the voltage drop collecting signal may be converted into a control signal for outputting the FB voltage of the DCDC power converter by using the signal conditioning circuit. The signal conditioning circuits can also be of many kinds, for example: the Digital potentiometer comprises a singlechip (or other programmable control processors), a Digital Analog Converter (DAC) for output, a singlechip (or other programmable control processors), a Digital potentiometer, a separation circuit utilizing integrated operational amplifier and the like.
The output of the signal conditioning circuit may be used to control the FB voltage of the DCDC. Or the Pulse Width Modulation (PWM) signal can be provided to a DCDC internal PWM controller to directly adjust the PWM duty ratio. In summary, it is within the scope of this patent to provide a method for directly or indirectly controlling the DCDC output voltage from the output of the signal conditioning circuit.
The whole control is explained by two examples of a single chip microcomputer and an integrated operational amplifier respectively.
First, a single chip microcomputer control system is taken as an example for explanation:
fig. 8 is a circuit diagram for adjusting the voltage drop across the current-limiting switch by using the single-chip microcomputer control system according to the embodiment of the present invention, as shown in fig. 8, when the single-chip microcomputer control is used, the voltage across the current-limiting switch may be respectively collected by an ADC collecting channel, or a differential-to-single-ended circuit (such as a differential operational amplifier circuit) may be used to convert the voltage difference across the current-limiting switch into a single-ended output, and one ADC channel is used for collection. After the voltage data is collected, the interior of the single chip microcomputer judges according to a preset threshold value. If the threshold exceeds the standard, the single chip microcomputer controls a DAC (digital-to-analog conversion output) to output analog voltage according to program setting. This analog voltage is connected to the base of a transistor (which of course, depending on the circuit design, may also be connected directly to the FB feedback pin of the DCDC). The collector and emitter of the triode are connected in series in the divider resistance network of the FB feedback voltage of the DCDC. The base electrode of the triode is controlled, so that the impedance between the collector electrode and the emitter electrode of the triode is changed, the voltage division ratio of the voltage division resistor network is changed, and the FB feedback voltage can be changed. Due to the change of the FB feedback voltage, the DCDC output voltage changes, and thus the voltage drop across the current limiting resistor changes. Therefore, a closed-loop control system is formed by ADC acquisition of voltage drop at two ends of the current-limiting resistor → single chip microcomputer → DAC output → FB feedback voltage → DCDC output change → voltage drop change at two ends of the current-limiting resistor until the voltage drop at two ends of the current-limiting resistor is reduced to be within a threshold range. This achieves the requirement of reducing the power consumption of the current limiting switch.
As can be seen from fig. 8, fig. 8 is a circuit block diagram of the feedback adjustment system formed by the single chip microcomputer + ADC + DAC. In fig. 8, the voltages across the current limiting switches are separately collected using ADCs. When the charging load of the mobile power supply exceeds the current value set by the current limiting switch, a relatively large voltage drop is generated at two ends of the current limiting switch. The ADC transmits the collected voltage to the single chip microcomputer, and the single chip microcomputer judges and processes according to a threshold value set by a program. The result processed by the singlechip outputs an analog signal through the DAC to control the base electrode of the triode. If the voltage difference between the two ends of the current-limiting switch is larger, the voltage output by the DAC is reduced, at the moment, the triode works in a non-saturated conduction state, and the impedance between the collector and the emitter of the triode is increased. After the impedance of the triode is increased, the resistance voltage-dividing ratio of the FB pin of the DCDC is changed, and the voltage of the FB pin is increased due to the fact that the impedance of the lower half part of the voltage-dividing resistance network is increased. The voltage change of the FB pin is fed back to the interior of the DCDC, and the DCDC changes the duty ratio of the PWM modulation, so that the output voltage of the DCDC is reduced. Due to the closed-loop control system, the whole system can continuously feed back and circulate until the voltage difference between the two ends of the current-limiting switch is reduced to be within the range of the set threshold value. Therefore, a closed-loop feedback control system is formed by the ADC, the singlechip, the DAC and the triode. The purpose of the invention is achieved.
The following description takes an integrated operational amplifier control system as an example:
fig. 9 is a circuit diagram for adjusting the voltage drop across the current limit switch using the integrated operational amplifier control system according to an embodiment of the present invention, and as shown in fig. 9, a differential operational amplifier is used to convert the voltage difference across the current limit switch into a single-ended output. The output of the differential operational amplifier is inverted and scaled down by using an inverting proportional operational amplifier circuit, i.e., the larger the input, the smaller the output. The base electrode of a triode is controlled by the output of the inverse proportion operational amplifier, and when the voltage of the base electrode is higher, the impedance between the collector electrode and the emitter electrode of the triode is lower; the impedance between the collector and the emitter of the triode is higher when the voltage of the base is lower. Because the collector and the emitter of the triode are connected in series in the FB feedback resistance network of the DCDC, when the impedance between the collector and the emitter is changed, the voltage division ratio of the feedback resistance network is changed, the FB feedback voltage is further influenced, and the purpose of changing the output voltage of the DCDC is achieved. The whole adjusting process is as follows: differential operational amplifier converting the voltage difference of the current limiting switch → inverse proportion operational amplifier outputting inverse control signal → impedance change of triode → FB feedback voltage change → DCDC output change → voltage difference change at two ends of the current limiting switch.
As can be seen from fig. 9, in this embodiment, a differential operational amplifier is first used to convert the voltage difference across the current-limiting resistor into a single-ended signal output. The inverting proportion operational amplifier circuit receives the output analog signal of the differential operational amplifier and outputs the inverting proportion (namely, the larger the input voltage is, the smaller the output voltage is, and the output proportion can be changed by adjusting Ri and Rf). The output analog voltage of the inverse proportion operational amplifier controls the base electrode of the triode. If the voltage difference between the two ends of the current-limiting switch is larger, the output voltage of the inverse proportion operational amplifier is reduced, and the impedance between the collector electrode and the emitter electrode of the triode is increased. After the impedance of the triode is increased, the FB pin resistance voltage division ratio of the DCDC is changed, so that the voltage of the FB is increased. The voltage change on the FB is fed back to the interior of the DCDC, and the DCDC changes the duty ratio of the PWM modulation, so that the output voltage of the DCDC is reduced. This forms a closed loop feedback loop control system. Thereby solving the problems in the related art as described above.
Since there are many methods for controlling the DCDC output according to the voltage difference feedback of the output current limit switch, the voltage difference feedback can be directly connected to the PWM controller of the DCDC to control the output voltage without the FB feedback voltage manner of the DCDC. Therefore, it is not possible to describe every control scheme in this patent. The protection scope of the patent is within the scope of the present patent as long as the method collects the voltage drop at the two ends of the current-limiting switch, dynamically adjusts the output voltage of the DCDC, and reduces the power consumption of the current-limiting switch.
In practical application, the current-limiting switch and the feedback control part circuit can be directly integrated into a DCDC chip. This can simplify the peripheral circuitry. The purpose of controlling the output current of the DCDC can be achieved by adopting a method of controlling the current at the input end of the DCDC chip. For example, a PMOS transistor or a current-limiting switch is added to the input terminal.
Fig. 10 is a flowchart of a method for reducing power consumption of a DCDC current-limited output according to an embodiment of the present invention, and as shown in fig. 10, the flowchart includes the following steps:
step S1002, external interrupt insertion is performed, and charging of the mobile power supply is started;
step S1004, the DCDC outputs current and voltage to the outside through a current limiting switch;
step S1006, the feedback adjusting system collects the voltage at two ends of the current-limiting switch;
step S1008, the feedback adjusting system judges the current on the current limiting switch according to the acquisition result of the pressure difference, and whether the current limiting switch starts to limit the current (according to a set threshold value); if the acquired result is that the differential pressure does not exceed the threshold (i.e. the current-limiting switch does not play a role in limiting current yet), the feedback adjustment system does not perform adjustment, the process returns to step S1004, and the feedback adjustment system continues to monitor the differential pressure on the current-limiting switch;
step S1010, if the acquired result is that the differential pressure exceeds a threshold value, the feedback adjusting system outputs a control signal to adjust the voltage of the base electrode of the triode;
step S1012, the voltage division ratio of the FB resistor network of the DCDC is changed as a result of the adjustment of the base voltage of the triode, and the FB voltage is increased;
in step S1014, after the FB voltage is increased, the internal of the DCDC automatically adjusts the duty ratio of the PWM to decrease the output voltage of the DCDC. Flow then returns to 02 where the DCDC outputs the voltage current. If the adjustment is not in place, the whole closed-loop system can be adjusted circularly until the output of the DCDC, and the voltage difference between the two ends of the current-limiting switch meets the set threshold condition;
in step S1016, the adjustment flow ends.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, detecting the voltage drop value of two ends of a current limiting switch used for limiting output current in a charging device, wherein the charging device is used for charging a preset terminal;
and S2, when the voltage drop value across the current-limiting switch is detected to exceed the preset threshold value, adjusting the output voltage of the DC-DC power converter in the charging equipment, so that the voltage drop across the current-limiting switch is smaller than or equal to the preset threshold value.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Alternatively, in the present embodiment, the processor performs the above-mentioned steps S1-S2 according to program codes already stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
Through the scheme in each embodiment of the invention, the power consumption of the current-limiting switch in the mobile power supply can be effectively reduced, and the output efficiency of the mobile power supply is improved; the heating of the mobile power supply is effectively reduced, and the reliability and the safety of the mobile power supply are improved; due to the wide use and high integration of the integrated operational amplifier, the circuit in the embodiment of the invention can be easily integrated into all current DCDCDCDCDCDCCs.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of pressure drop control, comprising:
detecting a voltage drop value across a current limiting switch for limiting an output current in a charging device, wherein the charging device is used for charging a predetermined terminal;
when the voltage drop value of the two ends of the current limiting switch is detected to exceed a preset threshold value, adjusting the output voltage of a direct current-to-direct current (DCDC) power converter in the charging equipment, so that the voltage drop of the two ends of the current limiting switch is smaller than or equal to the preset threshold value;
wherein adjusting the output voltage of the DCDC power converter in the charging device comprises: changing a duty ratio of Pulse Width Modulation (PWM) modulation by adjusting a feedback voltage of a Feedback (FB) pin in the DCDC power converter, and adjusting the output voltage of the DCDC power converter through the duty ratio;
adjusting the feedback voltage of the FB pin in the DCDC power converter by:
outputting a predetermined voltage to a base of a triode, wherein a collector and an emitter of the triode are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used for changing a voltage dividing ratio of the voltage dividing resistance network by changing impedance between the collector and the emitter;
adjusting the feedback voltage of the FB pin by changing the voltage division ratio of the voltage division resistance network;
outputting the predetermined voltage to the base of the transistor comprises:
collecting voltages at two ends of the current-limiting switch through an ADC (analog to digital converter) channel, judging whether the detected voltage drop value at two ends of the current-limiting switch exceeds a threshold value or not through a single chip microcomputer, and controlling a DAC (digital to analog converter) to output the preset voltage according to program setting if the detected voltage drop value exceeds the threshold value; outputting the determined predetermined voltage to the base of the triode; and/or the presence of a gas in the gas,
converting the voltage drop at two ends of the current limiting switch into single-ended output through a differential operational amplifier; carrying out reverse equal-proportion reduction on the voltage output by the single end by using a reverse proportion operational amplifier circuit to obtain the preset voltage; and outputting the obtained preset voltage to the base electrode of the triode.
2. The method of claim 1, wherein changing a duty cycle of a Pulse Width Modulation (PWM) modulation by adjusting the feedback voltage of the FB pin in the DCDC power converter comprises:
reducing the output voltage of the DCDC power converter by increasing the feedback voltage of the FB pin in the DCDC power converter.
3. A pressure drop control device, comprising:
the detection module is used for detecting a voltage drop value at two ends of a current limiting switch used for limiting output current in charging equipment, wherein the charging equipment is used for charging a preset terminal;
the adjusting module is used for adjusting the output voltage of a direct current-to-direct current (DCDC) power converter in the charging equipment when the voltage drop value of the two ends of the current limiting switch is detected to exceed a preset threshold value, so that the voltage drop of the two ends of the current limiting switch is smaller than or equal to the preset threshold value;
wherein the adjustment module comprises: the adjusting unit is used for changing the duty ratio of Pulse Width Modulation (PWM) modulation by adjusting the feedback voltage of a feedback FB pin in the DCDC power converter, and adjusting the output voltage of the DCDC power converter through the duty ratio;
in adjusting the feedback voltage of the FB pin in the DCDC power converter, the adjustment unit includes:
an output subunit, configured to output a predetermined voltage to a base of a triode, wherein a collector and an emitter of the triode are connected in series in a voltage dividing resistance network of the feedback voltage, and the predetermined voltage is used to change a voltage dividing ratio of the voltage dividing resistance network by changing an impedance between the collector and the emitter;
the adjusting subunit is configured to adjust the feedback voltage of the FB pin by changing the voltage division ratio of the voltage division resistor network;
the output subunit includes:
the determining secondary subunit is used for acquiring the voltages at the two ends of the current-limiting switch through an ADC (analog to digital converter) channel, judging whether the detected voltage drop values at the two ends of the current-limiting switch exceed a threshold value or not through a single chip microcomputer, and controlling a DAC (digital to analog converter) to output the preset voltage according to program setting if the detected voltage drop values exceed the threshold value; the first output subunit is used for outputting the determined preset voltage to the base electrode of the triode; and/or the presence of a gas in the gas,
the conversion sub-unit is used for converting the voltage drop at two ends of the current-limiting switch into single-ended output through a differential operational amplifier; the processing secondary subunit is used for carrying out reverse equal-proportion reduction on the voltage output by the single end by utilizing a reverse proportion operational amplifier circuit to obtain the preset voltage; and the second output subunit is used for outputting the obtained preset voltage to the base electrode of the triode.
4. The apparatus of claim 3, wherein the adjusting unit comprises:
reducing the output voltage of the DCDC power converter by increasing the feedback voltage of the FB pin in the DCDC power converter.
5. A pressure drop controller, characterized in that it comprises the device of claim 3 or 4.
6. A charging device comprising a current-limiting switch, a DC-to-DC DCDC power converter, and the voltage-drop controller of claim 5, wherein,
the current limiting switch is used for limiting output current;
the DCDC power converter is connected to the current-limiting switch and is used for providing output voltage for the current-limiting switch;
the voltage drop controller is connected to the current limiting switch and the DCDC power converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510483950.9A CN106451581B (en) | 2015-08-07 | 2015-08-07 | Voltage drop control method and device, voltage drop controller and charging equipment |
| PCT/CN2016/078449 WO2017024803A1 (en) | 2015-08-07 | 2016-04-05 | Voltage drop control method and apparatus, voltage drop controller and charging device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510483950.9A CN106451581B (en) | 2015-08-07 | 2015-08-07 | Voltage drop control method and device, voltage drop controller and charging equipment |
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| CN107257576B (en) * | 2017-07-26 | 2022-01-04 | Tcl移动通信科技（宁波）有限公司 | Mobile terminal, dynamic setting method of radio frequency switch voltage of mobile terminal and storage medium |
| CN109256976A (en) * | 2018-09-28 | 2019-01-22 | 南京智能高端装备产业研究院有限公司 | A kind of adjustable high-voltage pulse driving circuit of output waveform |
| CN116056286B (en) * | 2023-04-03 | 2023-06-09 | 东莞锐视光电科技有限公司 | Method, device, medium and electronic equipment for reducing voltage drop of light source circuit |
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| WO2017024803A1 (en) | 2017-02-16 |
| CN106451581A (en) | 2017-02-22 |
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