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CN107204705A - The control method of DC-DC adjusters and its soft start, controller - Google Patents

The control method of DC-DC adjusters and its soft start, controller Download PDF

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Publication number
CN107204705A
CN107204705A CN201610159258.5A CN201610159258A CN107204705A CN 107204705 A CN107204705 A CN 107204705A CN 201610159258 A CN201610159258 A CN 201610159258A CN 107204705 A CN107204705 A CN 107204705A
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CN
China
Prior art keywords
module
regulator
power supply
controller
voltage value
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Granted
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CN201610159258.5A
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Chinese (zh)
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CN107204705B (en
Inventor
安建宏
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to CN201610159258.5A priority Critical patent/CN107204705B/en
Priority to PCT/CN2017/073100 priority patent/WO2017157113A1/en
Publication of CN107204705A publication Critical patent/CN107204705A/en
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Publication of CN107204705B publication Critical patent/CN107204705B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of DC DC adjusters and its control method, the controller of soft start, the Quick soft-start to realize DC DC adjusters, and then improve the response speed of system.Wherein, the control method of DC DC adjusters soft start includes：Controller determines the current power supply state of DC DC adjusters；Wherein, the power supply state is that battery is powered or non-battery is powered；The controller is according to the power supply state, and the working condition to the DC DC modules in the LDO modules in DC DC adjusters and DC DC adjusters is controlled, and makes the DC DC adjusters output required voltage value.

Description

DC-DC regulator and control method and controller for soft start of DC-DC regulator
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a Direct Current (DC) -DC regulator, a soft start control method thereof and a controller.
Background
As portable electronic products are increasingly used in the fields of communications, computers, consumer electronics, and the like, the demand for Integrated Circuits (ICs) of power management systems is also increasing. The DC-DC regulator is widely used as a switching power supply because of its excellent efficiency performance under a wide input voltage range and a wide load range. The main components of a conventional DC-DC regulator are shown in fig. 1, which includes, but is not limited to, an Error Amplifier (EA) module, a Pulse-Width Modulator (PWM) module, and a Power Stage (PS) module. The DC-DC regulator converts the error signal into a duty ratio control signal to drive the switch to work, and in a starting stage, the error amplifier is in an unbalanced state, so that a loop circuit works at a 100% duty ratio, and therefore a large surge current flows into an output capacitor, and the current loses a switching tube and other devices.
In conjunction with the operating loop of the voltage-mode BUCK DC-DC regulator shown in fig. 2, in the initial stage of starting, the output voltage is much lower than the set value, so the feedback voltage FB is much lower than the reference voltage, so that the error amplifier is in an unbalanced state, and the output of the error amplifier is at a high level, i.e., VC is at a high level, as can be seen from fig. 2, the loop operates at a 100% duty cycle. At this time, the output capacitor COUT is in a completely discharged state, so that a large surge current flows into the COUT (denoted as inrush current in fig. 2). The magnitude of the inrush current depends on the magnitude of the capacitance, the output voltage, and the start-up time. The change in voltage on the capacitor versus current can be expressed as:
wherein C represents a capacitance value, VCRepresenting the value of the voltage on the capacitor, ICRepresenting the value of the current flowing through the capacitor. As can be seen from equation (1), the current on the capacitor is proportional to the capacitance and also proportional to the rate of change of the voltage on the capacitor. For the output capacitor COUT, assuming that the output voltage VOUT increases linearly and the start time is Ts, the surge current I on COUTnrushCan be expressed as:
let COUT be 100uf, Vout be 2V, and Ts be 20us substitute for equation (2), and the resulting inrush current is 10A. For an application system, the inrush current far exceeds its maximum rated current.
Therefore, the soft start circuit is generated by the operation, and is used for controlling the duty ratio of the PWM pulse waveform to gradually change from the minimum value to the value required during normal operation in the rising process of the input voltage of the power supply so as to control the output voltage to gradually change. Because the duty ratio is gradually changed from the minimum value, the power tube can not be always conducted for a long time, thereby avoiding the generation of surge current and ensuring the reliability of a circuit system.
There are three main types of soft start circuits in the switching power supply currently used, as shown in fig. 3. The first is to adopt a capacitor and control the voltage rising process by utilizing the characteristic of voltage exponential rising when the capacitor is charged; the second is to adopt a capacitor and a resistor, and control the voltage rising process by utilizing the characteristic that the voltage index rises when the capacitor is charged; the third is purely digital control using a microcontroller to control the start-up process, such a soft start circuit requires additional microcontroller control and needs to be started before the power circuit part is powered up.
Fig. 4 corresponds to waveforms for implementing the soft start of the DC-DC regulator using the three soft start circuits shown in fig. 3, where vsofstart represents the output voltage during the soft start.
However, although the generation of surge current can be avoided by using the existing soft start circuit, the implementation mode causes the start time of the DC-DC regulator to be too long. In ultra-low power System on a Chip (SOC) and wireless applications, the power supply (e.g., PMU) has a short operating time, and thus the time for the soft start of the DC-DC regulator is often required not to be too long.
In summary, the existing DC-DC regulator has too long soft start time, and cannot meet the requirements of application fields such as ultra-low power consumption SOC and wireless.
Disclosure of Invention
The embodiment of the invention provides a DC-DC regulator, a soft start control method thereof and a controller, which are used for realizing the quick soft start of the DC-DC regulator and further improving the response speed of a system.
The control method for the soft start of the DC-DC regulator provided by the embodiment of the invention comprises the following steps:
the controller determines the current power supply state of the DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
the controller controls working states of a Low Dropout Regulator (LDO) module in the DC-DC Regulator and a DC-DC module in the DC-DC Regulator according to the power supply state, so that the DC-DC Regulator outputs a required voltage value.
According to the method, the current power supply state of the DC-DC regulator is judged through the controller, and then the working states of the LDO module and the DC-DC module are controlled according to the power supply state, because the response speed of the LDO module after being electrified is high, and the LDO module does not need soft start when being started, the LDO module can replace a soft start circuit in the prior art, so that the DC-DC regulator can quickly output a required voltage value, the time for the soft start of the DC-DC regulator is effectively shortened through the method, the quick soft start of the DC-DC regulator is realized, the response speed of a system is improved, and the requirements of application fields such as ultra-low power consumption SOC and wireless can be met.
Preferably, the determining the power supply state of the DC-DC regulator by the controller specifically includes:
the controller judges whether the DC-DC regulator is connected with a mains supply through an adapter or not through an output ENABLE (ENABLE) signal;
when the controller judges that the adapter is not connected with a mains supply, the current power supply state of the DC-DC regulator is determined to be battery power supply; or when the controller judges that the adapter is connected with the mains supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
Preferably, when the current power supply state of the DC-DC regulator is battery powered, the controller controls the working states of the LDO module in the DC-DC regulator and the DC-DC module in the DC-DC regulator according to the current power supply state, so that the DC-DC regulator outputs a required voltage value, specifically including:
the controller detects whether the DC-DC module is started up;
the controller disables an LDO module that is providing an output voltage when it is determined that the DC-DC module has completed starting, the DC-DC module outputting a desired voltage value.
Therefore, under the condition of power supply of the battery, compared with the DC-DC module, the LDO module has higher response speed and can be started earlier, so that the LDO module outputs the voltage value required to be output by the DC-DC regulator earlier, and the rapid soft start of the DC-DC regulator is further realized. In addition, compared with the LDO module, the DC-DC module has higher working efficiency, namely lower power consumption, so that in the method, after the DC-DC module is determined to be started, the LDO module which is providing the output voltage is forbidden to work, and the DC-DC module outputs the required voltage value, thereby reducing the power consumption of the system, being beneficial to saving energy of a battery and enabling the battery to provide longer-time power supply.
Preferably, the detecting, by the controller, whether the DC-DC module is started includes:
the controller detects whether the working voltage value of the DC-DC module reaches a preset threshold value;
the controller determines that the DC-DC module is started up when determining that the working voltage value of the DC-DC module is greater than or equal to a preset threshold value.
Preferably, when the current power supply state of the DC-DC regulator is non-battery-powered, the controller controls the working states of the LDO module in the DC-DC regulator and the DC-DC module in the DC-DC regulator according to the current power supply state, so that the DC-DC regulator outputs a required voltage value, which specifically includes:
the controller enables the DC-DC module to be forbidden to work, and the LDO module outputs a continuously required voltage value.
Thus, a fast soft start of the DC-DC regulator can be achieved by the LDO module. In addition, because the current power supply state is non-battery power supply, the energy-saving problem of the battery does not need to be considered, and the method is simpler and more efficient in implementation.
The embodiment of the invention provides a controller, which comprises:
a first module for determining a current power supply state of a DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
and the second module is used for controlling the LDO module in the DC-DC regulator and the working state of the DC-DC module in the DC-DC regulator according to the power supply state, so that the DC-DC regulator outputs a required voltage value.
Preferably, the first module is specifically configured to:
judging whether the DC-DC regulator is connected with a mains supply through an adapter or not through an output ENABLE signal;
when the adapter is judged not to be connected with a mains supply, determining that the current power supply state of the DC-DC regulator is battery power supply; or when the adapter is judged to be connected with the commercial power supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
Preferably, when the current power supply state of the DC-DC regulator is battery power, the second module is specifically configured to:
detecting whether the DC-DC module is started up;
when it is determined that the DC-DC module has completed starting, the LDO module that is providing the output voltage is disabled, and the DC-DC module outputs a desired voltage value.
Preferably, the second module detects whether the DC-DC module completes starting, and is specifically configured to:
detecting whether the working voltage value of the DC-DC module reaches a preset threshold value or not;
and when the working voltage value of the DC-DC module is determined to be larger than or equal to a preset threshold value, determining that the DC-DC module is started.
Preferably, when the current power supply state of the DC-DC regulator is non-battery power supply, the second module is specifically configured to:
and the DC-DC module is forbidden to work, and the LDO module continuously outputs the required voltage value.
The DC-DC regulator provided by the embodiment of the invention comprises the controller.
Preferably, the DC-DC regulator further includes:
a DC-DC module connected with the controller, and an LDO module connected with the controller;
the DC-DC regulator outputs a required voltage value by one of the following ways:
under the control of the controller, outputting a voltage value required to be output by the DC-DC regulator by the LDO module before the DC-DC module does not complete the start-up, and outputting a voltage value required to be output by the DC-DC regulator by the DC-DC module after the DC-DC module completes the start-up; or,
under the control of the controller, continuously outputting the voltage value required to be output by the DC-DC regulator through the LDO module.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the main components of a conventional DC-DC regulator;
FIG. 2 is a schematic diagram of the operation principle of a conventional voltage-mode BUCK type DC-DC regulator;
FIG. 3 is a schematic diagram of a conventional soft start circuit of a switching power supply;
fig. 4 is a waveform diagram of implementing soft start of a DC-DC regulator corresponding to a conventional switching power supply soft start circuit;
fig. 5 is a system block diagram of a DC-DC regulator according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a control method for soft start of a DC-DC regulator according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating an operating state of a DC-DC regulator according to an embodiment of the present invention;
fig. 8 is a schematic diagram of an operating state of another DC-DC regulator according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a DC-DC regulator, a soft start control method thereof and a controller, which are used for realizing the quick soft start of the DC-DC regulator and further improving the response speed of a system.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the embodiment of the invention, the LDO module is adopted to replace the existing soft start circuit, and the LDO module does not need soft start when being started, so that the response speed is high, and the output voltage value required by a low-power-consumption system can be provided quickly.
Fig. 5 shows a system block diagram of a DC-DC regulator according to an embodiment of the present invention.
The DC-DC regulator shown in fig. 5 mainly includes a DC-DC module, an LDO module, and a controller module, where the controller module is connected to the LDO module and the DC-DC module, VCHG indicates that the DC-DC regulator is connected to a mains power source through an adapter, that is, the DC-DC regulator is not powered by a battery in a power supply state, Vbat indicates that the DC-DC regulator is powered by a battery, EN indicates an enable signal output by the controller, and V0 indicates a voltage output by the DC-DC regulator.
In addition, it should be noted that the DC-DC module may be designed by using an existing DC-DC circuit, for example, the DC-DC module may include, but is not limited to, an error amplifier unit, a pulse width modulator unit, and the like, and the LDO module is not limited by the embodiment of the present invention, and any existing LDO may be used to form the DC-DC regulator designed by the embodiment of the present invention. Of course, the DC-DC module, the LDO module, and the controller module may further include an inductor, a capacitor, and other peripheral circuits, and the embodiments of the present invention are not discussed in detail.
Based on the system block diagram of the DC-DC regulator shown in fig. 5, referring to fig. 6, an embodiment of the present invention provides a control method for soft start of a DC-DC regulator, including:
s601, the controller determines the current power supply state of the DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
here, the controller may be provided in the DC-DC regulator, that is to say the controller belongs to one module in the DC-DC regulator. In addition, when the current power supply state of the DC-DC regulator is to supply power to the battery, the embodiment of the present invention does not limit the type of the battery, and may be, for example, a lithium battery, a lead-acid battery, or the like, and preferably, a lithium battery may be used. The non-battery power supply may be, for example, a mode in which the adapter is connected to a commercial power supply.
And S602, the controller controls the LDO module in the DC-DC regulator and the working state of the DC-DC module in the DC-DC regulator according to the power supply state, so that the DC-DC regulator outputs a required voltage value.
Preferably, the determining the power supply state of the DC-DC regulator by the controller specifically includes:
the controller judges whether the DC-DC regulator is connected with a mains supply through the adapter or not by outputting an ENABLE signal;
when the controller judges that the adapter is not connected with a mains supply, the current power supply state of the DC-DC regulator is determined to be battery power supply; or when the controller judges that the adapter is connected with the mains supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
The operation of the DC-DC regulator is explained in detail below for two supply states of the DC-DC regulator (battery-powered and non-battery-powered).
(1) Battery powered
The operating state of the DC-DC regulator under battery-powered conditions is schematically illustrated in fig. 7.
When the system is started, the controller firstly outputs an ENABLE signal to judge whether the DC-DC regulator is connected to a mains supply through an adapter (Charger), and if the adapter is not connected to the mains supply, the DC-DC regulator is determined to be powered by a battery (represented by Vbat). At this time, the LDO module, the output power tube, and the DC-DC module are all powered by Vbat, on one hand, because the LDO module responds at any time and starts up at a fast speed, after a period of delay (delay), the LDO module first enables start-up and starts to operate, and the system enters a mode operated by the LDO module, and the system outputs a voltage V0 required by the system. On the other hand, the DC-DC module also enables the start, but because of its slow start speed, the controller detects whether the DC-DC module has completed the start, and when determining that the DC-DC module has completed the start, the controller disables the LDO module that is providing the output voltage V0, while the DC-DC regulator operates in the switching mode, and the output voltage V0 is provided by the DC-DC module.
Therefore, under the condition of power supply of the battery, compared with the DC-DC module, the LDO module has higher response speed and can be started earlier, so that the LDO module outputs the voltage value required to be output by the DC-DC regulator earlier, and the rapid soft start of the DC-DC regulator is further realized. In addition, compared with the LDO module, the DC-DC module has higher working efficiency, namely lower power loss ratio, so that in the method, after the DC-DC module is determined to be started, the LDO module which is providing the output voltage is forbidden to work, and the DC-DC module outputs the required voltage value, thereby reducing the power consumption of the system, being beneficial to saving energy of a battery and enabling the battery to provide power for a longer time.
Preferably, the controller may detect whether the DC-DC module has completed startup by:
the controller detects whether the working voltage value of the DC-DC module reaches a preset threshold value;
and when the controller determines that the working voltage value of the DC-DC module is greater than or equal to a preset threshold value, the controller determines that the DC-DC module is started.
The preset threshold value can be set according to the working voltage value of the DC-DC module after the DC-DC module is actually started.
(2) Non-battery powered
Fig. 8 is a schematic diagram of the operating state of the DC-DC regulator under the condition that the power supply state of the DC-DC regulator is not battery power.
When the system is started, the controller firstly outputs an ENABLE signal to judge whether the DC-DC regulator is connected to a mains supply through an adapter (Charger), and if the adapter is connected to the mains supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply (in the embodiment, VCHG). At this time, since it is not necessary to consider the problems of battery saving and capacity size, the controller disables the DC-DC module, enables the LDO module, starts the operation after a delay (delay) from the LDO module, and continuously outputs the required voltage value V0. At this time, the output power tube is also powered by VCHG.
Thus, a fast soft start of the DC-DC regulator can be achieved by the LDO module. In addition, because the current power supply state is non-battery power supply, the problems of energy conservation and capacity size of the battery do not need to be considered, and the method is simpler and more efficient in implementation.
An embodiment of the present invention further provides a controller, including:
a first module for determining a current power supply state of a DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
and the second module is used for controlling the LDO module in the DC-DC regulator and the working state of the DC-DC module in the DC-DC regulator according to the power supply state, so that the DC-DC regulator outputs a required voltage value.
Preferably, the first module is specifically configured to:
judging whether the DC-DC regulator is connected with a mains supply through an adapter or not by outputting an ENABLE signal;
when the adapter is judged not to be connected with a mains supply, determining that the current power supply state of the DC-DC regulator is battery power supply; or when the adapter is judged to be connected with the commercial power supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
Preferably, when the current power supply state of the DC-DC regulator is battery power, the second module is specifically configured to:
detecting whether the DC-DC module is started up;
when it is determined that the DC-DC module has completed starting, the LDO module that is providing the output voltage is disabled, and the DC-DC module outputs a desired voltage value.
Preferably, the second module detects whether the DC-DC module completes starting, and is specifically configured to:
detecting whether the working voltage value of the DC-DC module reaches a preset threshold value or not;
and when the working voltage value of the DC-DC module is determined to be larger than or equal to a preset threshold value, determining that the DC-DC module is started.
Preferably, when the current power supply state of the DC-DC regulator is non-battery power supply, the second module is specifically configured to:
and the DC-DC module is forbidden to work, and the LDO module continuously outputs the required voltage value.
An embodiment of the present invention provides a DC-DC regulator, which is shown in fig. 5 and includes the above-mentioned controller having the first module and the second module.
Also, preferably, the DC-DC regulator further includes: a DC-DC module connected with the controller, and an LDO module connected with the controller;
the DC-DC regulator outputs a required voltage value by one of the following ways:
under the control of the controller, outputting a voltage value required to be output by the DC-DC regulator by the LDO module before the DC-DC module does not complete the start-up, and outputting a voltage value required to be output by the DC-DC regulator by the DC-DC module after the DC-DC module completes the start-up; or,
under the control of the controller, continuously outputting the voltage value required to be output by the DC-DC regulator through the LDO module.
The specific operation of the DC-DC regulator can be seen from the related discussion of fig. 7 and 8.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A control method for soft start of a direct current DC-DC regulator is characterized by comprising the following steps:
the controller determines the current power supply state of the DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
and the controller controls the working states of a low dropout regulator (LDO) module in the DC-DC regulator and a DC-DC module in the DC-DC regulator according to the power supply state, so that the DC-DC regulator outputs a required voltage value.
2. The method according to claim 1, wherein the controller determines a power supply state of the DC-DC regulator, specifically comprising:
the controller judges whether the DC-DC regulator is connected with a mains supply through an adapter or not through an output ENABLE signal;
when the controller judges that the adapter is not connected with a mains supply, the current power supply state of the DC-DC regulator is determined to be battery power supply; or when the controller judges that the adapter is connected with the mains supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
3. The method of claim 1, wherein when the current power supply status of the DC-DC regulator is battery power, the controller controls the low dropout regulator LDO module in the DC-DC regulator and the operating status of the DC-DC module in the DC-DC regulator according to the current power supply status, so that the DC-DC regulator outputs the required voltage value, specifically comprising:
the controller detects whether the DC-DC module is started up;
the controller disables an LDO module that is providing an output voltage when it is determined that the DC-DC module has completed starting, the DC-DC module outputting a desired voltage value.
4. The method according to claim 3, wherein the controller detects whether the DC-DC module has completed startup, specifically comprising:
the controller detects whether the working voltage value of the DC-DC module reaches a preset threshold value;
the controller determines that the DC-DC module is started up when determining that the working voltage value of the DC-DC module is greater than or equal to a preset threshold value.
5. The method of claim 1, wherein when the current power supply status of the DC-DC regulator is non-battery-powered, the controller controls the operating statuses of the low dropout regulator LDO module in the DC-DC regulator and the DC-DC module in the DC-DC regulator according to the current power supply status, so that the DC-DC regulator outputs the required voltage value, specifically comprising:
the controller enables the DC-DC module to be forbidden to work, and the LDO module continuously outputs the required voltage value.
6. A controller, characterized in that the controller comprises:
a first module for determining a current power supply state of the DC-DC regulator; wherein the power supply state is battery powered or non-battery powered;
and the second module is used for controlling the working states of a low dropout regulator (LDO) module in the DC-DC regulator and a DC-DC module in the DC-DC regulator according to the power supply state, so that the DC-DC regulator outputs a required voltage value.
7. The controller of claim 6, wherein the first module is specifically configured to:
judging whether the DC-DC regulator is connected with a mains supply through an adapter or not through an output ENABLE signal;
when the adapter is judged not to be connected with a mains supply, determining that the current power supply state of the DC-DC regulator is battery power supply; or when the adapter is judged to be connected with the commercial power supply, the current power supply state of the DC-DC regulator is determined to be non-battery power supply.
8. The controller according to claim 6, wherein when the current power supply status of the DC-DC regulator is battery power, the second module is specifically configured to:
detecting whether the DC-DC module is started up;
when it is determined that the DC-DC module has completed starting, the LDO module that is providing the output voltage is disabled, and the DC-DC module outputs a desired voltage value.
9. The controller according to claim 8, wherein the second module, when detecting whether the DC-DC module has completed starting, is specifically configured to:
detecting whether the working voltage value of the DC-DC module reaches a preset threshold value or not;
and when the working voltage value of the DC-DC module is determined to be larger than or equal to a preset threshold value, determining that the DC-DC module is started.
10. The controller according to claim 6, wherein when the current power supply status of the DC-DC regulator is non-battery power, the second module is specifically configured to:
and the DC-DC module is forbidden to work, and the LDO module continuously outputs the required voltage value.
11. A DC-DC regulator comprising the controller of any one of claims 6 to 10.
12. A DC-DC regulator according to claim 11, further comprising: the DC-DC module is connected with the controller, and the low dropout regulator (LDO) module is connected with the controller;
the DC-DC regulator outputs a required voltage value by one of the following ways:
under the control of the controller, outputting a voltage value required to be output by the DC-DC regulator by the LDO module before the DC-DC module does not complete the start-up, and outputting a voltage value required to be output by the DC-DC regulator by the DC-DC module after the DC-DC module completes the start-up; or,
under the control of the controller, continuously outputting the voltage value required to be output by the DC-DC regulator through the LDO module.
CN201610159258.5A 2016-03-18 2016-03-18 The control method of DC-DC adjuster and its soft start, controller Active CN107204705B (en)

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