CN111697647A - Charging circuit, terminal, and control method and device of charging circuit - Google Patents

Charging circuit, terminal, and control method and device of charging circuit Download PDF

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Publication number
CN111697647A
CN111697647A CN202010513423.9A CN202010513423A CN111697647A CN 111697647 A CN111697647 A CN 111697647A CN 202010513423 A CN202010513423 A CN 202010513423A CN 111697647 A CN111697647 A CN 111697647A
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switching tube
circuit
charging
switched
charging period
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Chinese (zh)
Inventor
陈佳
刘小勇
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Meizu Technology Co Ltd
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Meizu Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model relates to a charging circuit and terminal, charging circuit's control method and device, belong to circuit technical field, the present disclosure produces periodic control signal through control circuit, control one-level step-down converting circuit and step down input voltage, and a plurality of switch tubes have been increased in the one-level step-down converting circuit, and the electric capacity has been connected in parallel at a plurality of switch tube both ends that increase, make one-level step-down converting circuit have three kinds of operating condition, therefore under different input voltage conditions, can provide stable output voltage through the switching of three kinds of operating condition, final second level step-down converting circuit steps down the output voltage of one-level step-down converting circuit, reach the charging voltage of terminal battery, thereby realize high-power and charge. In addition, the energy loss of components in the charging circuit is reduced, the heat generation is reduced, chips supporting corresponding protocols do not need to be arranged in the charging wire and the power adapter, and the production cost is saved.

Description

Charging circuit, terminal, and control method and device of charging circuit
Technical Field
The present disclosure relates to the field of circuit technologies, and in particular, to a charging circuit, a terminal, and a control method and device for the charging circuit.
Background
With the development of charging technology, the rapid charging technology has become popular. The inventor researches the existing quick charging technology to find that the existing quick charging technologies have the following problems: the traditional high-voltage quick charging scheme has low charging efficiency, cannot realize high-power quick charging, and energy loss is concentrated in a BUCK circuit, so that the lost energy is converted into heat energy, the terminal is seriously heated, and the safe use of equipment is influenced; the other scheme is a low-voltage quick charging scheme, although the charging efficiency is improved to a certain extent compared with the high-voltage quick charging scheme, the high-power quick charging cannot be realized because the energy loss is concentrated on a load switch, and the production cost is increased because a specific charging wire and a charging interface are required; the other is a high-voltage direct charging scheme adopting a charge pump, although the charging efficiency is further improved compared with the former two schemes, the fast charging with higher power can be realized, but the high-voltage direct charging scheme follows the PD protocol specification, a chip supporting a relevant protocol needs to be arranged in the adapter, and when the charging current is higher, an Emark chip needs to be added to the adopted charging wire and the adapter, so that the production cost is increased.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a charging circuit, a terminal, and a control method and device of the charging circuit.
In a first aspect, the present disclosure provides a charging circuit, including:
a control circuit for generating a periodic control signal;
the input end of the first-stage buck conversion circuit is electrically connected with the output end of the control circuit and is used for stepping down the input voltage based on the periodic control signal;
the input end of the second step-down conversion circuit is electrically connected with the voltage output end of the first step-down conversion circuit, and the output end of the second step-down conversion circuit is electrically connected with a battery of the terminal and used for reducing the output voltage of the first step-down conversion circuit;
wherein, one-level buck conversion circuit includes:
the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are sequentially connected in series; the drain electrode of the first switching tube is connected with the voltage input end;
the first capacitor is connected with the second switching tube and the third switching tube in parallel;
the first end of the first inductor is connected with a node between the second switching tube and the third switching tube;
the first end of the second capacitor is connected with the second end of the first inductor, and the second end of the second capacitor is grounded; and a node between the first inductor and the second capacitor is connected with the voltage output end.
In some embodiments, the charging circuit further comprises:
and the input end of the shunt regulating circuit is electrically connected with the voltage output end of the first-level buck conversion circuit, and the output end of the shunt regulating circuit is electrically connected with the battery and used for shunting the output current of the first-level buck conversion circuit.
In some embodiments, the charging circuit further comprises:
a load switch circuit arranged between the secondary buck conversion circuit and the battery for disconnecting the charging circuit when the output voltage of the secondary buck conversion circuit exceeds a preset voltage, or
When the output current of the two-stage buck conversion circuit exceeds the preset current, the charging circuit is disconnected.
In a second aspect, the present disclosure provides a terminal comprising the charging circuit of the first aspect of the present disclosure.
In a third aspect, the present disclosure provides a control method of a charging circuit, including:
detecting an input voltage value and an output voltage value of a first-stage buck conversion circuit;
if the input voltage value is larger than the output voltage value of the preset multiple, controlling a first switching tube and a third switching tube in the first-stage buck conversion circuit to be conducted and controlling a second switching tube and a fourth switching tube to be cut off in a first charging period so as to charge a first capacitor;
in a second charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on;
in a third charging period, the second switching tube is controlled to be conducted, and the third switching tube is controlled to be cut off, so that the first capacitor is discharged;
and in the fourth charging period, the second switching tube is controlled to be switched off, and the third switching tube is controlled to be switched on.
In some embodiments, the duration of the first charging period, the second charging period, the third charging period, and the fourth charging period is controlled by the control circuit.
In some embodiments, the control method of the charging circuit further comprises:
and adjusting the duration of the first charging period, the second charging period, the third charging period and the fourth charging period according to the preset relation between the input voltage value and the duration of the charging period.
In some embodiments, after detecting the input voltage and the output voltage of the one-stage buck conversion circuit, the method further includes:
if the input voltage value is smaller than the output voltage value of the preset multiple, the first switching tube and the second switching tube are controlled to be conducted, and the third switching tube and the fourth switching tube are controlled to be cut off in a first charging period;
in a second charging period, the second switching tube is controlled to be cut off, and the fourth switching tube is controlled to be conducted, so that the first capacitor is charged;
in a third charging period, controlling the second switching tube to be switched on and controlling the fourth switching tube to be switched off;
and in the fourth charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on, so that the first capacitor is discharged.
In a fourth aspect, the present disclosure provides a control device of a charging circuit, including:
the detection unit is used for detecting the input voltage value and the output voltage value of the first-stage buck conversion circuit;
the control unit is used for controlling the first switching tube and the third switching tube in the first-stage buck conversion circuit to be switched on and controlling the second switching tube and the fourth switching tube to be switched off in a first charging period if the input voltage value is larger than the output voltage value of the preset multiple, so that the first capacitor is charged;
in a second charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on;
in a third charging period, the second switching tube is controlled to be conducted, and the third switching tube is controlled to be cut off, so that the first capacitor is discharged;
and in the fourth charging period, the second switching tube is controlled to be switched off, and the third switching tube is controlled to be switched on.
In some embodiments, the control unit is further configured to:
if the input voltage value is smaller than the output voltage value of the preset multiple, the first switching tube and the second switching tube are controlled to be conducted, and the third switching tube and the fourth switching tube are controlled to be cut off in a first charging period;
in a second charging period, the second switching tube is controlled to be cut off, and the fourth switching tube is controlled to be conducted, so that the first capacitor is charged;
in a third charging period, controlling the second switching tube to be switched on and controlling the fourth switching tube to be switched off;
and in the fourth charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on, so that the first capacitor is discharged.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
produce periodic control signal through control circuit, control one-level buck conversion circuit and step down input voltage, and a plurality of switch tubes have been increased in the one-level buck conversion circuit, and the electric capacity has been connected in parallel at a plurality of switch tube both ends that increase, make one-level buck conversion circuit have three kinds of operating condition, consequently under the input voltage condition of difference, can be through the switching of three kinds of operating condition, provide stable output voltage, finally step down the output voltage of one-level buck conversion circuit through second grade buck conversion circuit, reach the charging voltage of terminal battery, thereby realize high-power charging. In addition, the energy loss of components in the charging circuit is reduced, the heat generation is reduced, chips supporting corresponding protocols do not need to be arranged in the charging wire and the power adapter, and the production cost is saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram of a charging circuit according to an embodiment of the disclosure;
fig. 2 is a structural diagram of a first-stage buck conversion circuit provided in the embodiment of the present disclosure;
fig. 3 is a block diagram of a charging circuit according to another embodiment of the disclosure;
fig. 4 is a schematic flowchart illustrating a control method of a charging circuit according to an embodiment of the disclosure;
fig. 5 is a line diagram illustrating voltage variation of each node and current variation of the first inductor when the first-stage buck conversion circuit provided by the embodiment of the disclosure is in one of operating states;
fig. 6 is a line diagram of a change in current of the output voltage and the first inductor when the first-stage buck conversion circuit provided by the embodiment of the present disclosure is in a stable state;
fig. 7 is a schematic flowchart illustrating a control method of a charging circuit according to another embodiment of the disclosure;
fig. 8 is a line diagram of a change in current of each node voltage and the first inductor when the first-stage buck conversion circuit provided by the embodiment of the present disclosure is in another operating state;
fig. 9 is a block diagram of a control device of a charging circuit according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Aiming at the problems that the prior charging scheme has low charging efficiency, can not realize high-power quick charging, has higher energy loss and converts the lost energy into heat energy to cause serious terminal heating and influence the safe use of equipment, and adopts PD protocol specification, a chip supporting relevant protocols needs to be arranged in an adapter, and when the charging current is higher, an Emark chip needs to be added to both the adopted charging wire and the adapter, thereby increasing the production cost, the technical scheme of the invention generates periodic control signals through a control circuit to control a primary step-down conversion circuit to step down the input voltage, a plurality of switching tubes are added in the primary step-down conversion circuit, and capacitors are connected in parallel at two ends of the added switching tubes, so that the primary step-down conversion circuit has three working states, and can be switched among the three working states under different input voltage conditions, and stable output voltage is provided, and finally, the output voltage of the primary step-down conversion circuit is reduced through the secondary step-down conversion circuit to reach the charging voltage of the terminal battery, so that high-power charging is realized. In addition, the energy loss of components in the charging circuit is reduced, the heat generation is reduced, chips supporting corresponding protocols do not need to be arranged in the charging wire and the power adapter, and the production cost is saved.
Specifically, in a first aspect, fig. 1 is a block diagram of a charging circuit 1 provided in an embodiment of the present disclosure, as shown in fig. 1, including:
a control circuit 100 for generating a periodic control signal;
the input end of the first-stage buck conversion circuit 200 is electrically connected with the output end of the control circuit 100 and is used for stepping down the input voltage based on the periodic control signal;
the input end of the second step-down converting circuit 300 is electrically connected with the voltage output end of the first step-down converting circuit 200, and the output end of the second step-down converting circuit 300 is electrically connected with a battery at a terminal and is used for reducing the output voltage of the first step-down converting circuit 200;
in the embodiment of the present disclosure, the control circuit may be a PWM control circuit, and the first-stage buck conversion circuit is controlled to periodically buck the input voltage by generating a PWM periodic control signal, so as to finally obtain a stable output voltage. The secondary step-down conversion circuit can adopt a charge pump in the prior art to step down the output voltage of the primary step-down conversion circuit to reach the charging voltage of the terminal battery so as to carry out high-power quick charging on the battery of the terminal.
Fig. 2 is a structural diagram of a first-stage buck conversion circuit provided in the embodiment of the present disclosure, and as shown in fig. 2, the first-stage buck conversion circuit 200 includes:
first switch tube Q connected in series in sequence1A second switch tube Q2And a third switching tube Q3And a fourth switching tube Q4(ii) a Wherein, the first switch tube Q1The drain electrode of the first transistor is connected with the voltage input end;
a first capacitor C1And a second switch tube Q2And a third switching tube Q3Parallel connection;
first inductance L1First inductance C1Is connected with a second switch tube Q2And a third switching tube Q3A node in between;
second capacitor C2A second capacitor C2Is connected with a first inductor L1A second terminal of the first capacitor C2The second terminal of (1) is grounded; wherein, the first inductance L1And a second capacitor C2The node between them is connected to the voltage output terminal.
In the embodiment of the disclosure, in the conventional BUCK circuit, the switching tube has conduction and cut-off losses, and the inductor also has losses of the coil and the magnetic core, so that the charging efficiency is low, and energy lost by the BUCK circuit is converted into heat energy, which causes that the terminal is heated seriously by adopting the charging scheme of the conventional BUCK circuit, and thus, charging with a large charging current cannot be realized.
The first-stage BUCK conversion circuit provided by the embodiment of the disclosure improves the existing BUCK circuit, for example, a second switching tube and a third switching tube are added, and a first capacitor is connected in parallel at two ends of the second switching tube and the third switching tube, so that the first-stage BUCK conversion circuit has three working states.
Specifically, the first-stage buck conversion circuit provided by the embodiment of the disclosure outputs the voltage V in three working statesOUTAt 0, VIN/2, and VINWhen the input voltage is higher than twice of the output voltage, the switch node G in the first-stage buck conversion circuit1、G2And G3Will be at 0 and VINAlternating between/2; when the input voltage is lower than twice the output voltage, the node G is switched1、G2And G3Will be at VINAnd VINAnd 2, even if the input voltage is higher, the one-stage buck conversion circuit provided by the embodiment of the disclosure can provide stable output voltage through switching of three working states.
Because the first-stage buck conversion circuit in the embodiment of the disclosure can input a higher input voltage, for example, 20V, 30V or higher, and when the input power is fixed, the input current is correspondingly reduced along with the increase of the input voltage, so the PD protocol specification may not be adopted, the charge wire does not need to increase an alarm chip, and the power adapter does not need to increase a chip supporting the PD protocol, and the first-stage buck conversion circuit can be used for wired high-power charging and wireless high-power charging, and simultaneously effectively saves the production cost.
The charging circuit that this disclosed embodiment provided, produce periodic control signal through control circuit, control one-level buck conversion circuit and step down input voltage, and a plurality of switch tubes have been increased in the one-level buck conversion circuit, and the electric capacity has been connected in parallel at a plurality of switch tube both ends that increase, make one-level buck conversion circuit have three kinds of operating condition, consequently under the input voltage condition of difference, can be through the switching of three kinds of operating condition, provide stable output voltage, finally step down the output voltage of one-level buck conversion circuit through second-level buck conversion circuit, reach the charging voltage value of terminal battery, thereby realize high-power charging. In addition, the energy loss of components in the charging circuit is reduced, the heat generation is reduced, chips supporting corresponding protocols do not need to be arranged in the charging wire and the power adapter, and the production cost is saved.
In some embodiments, based on the charging circuit shown in fig. 1, as shown in fig. 3, the charging circuit 1 further includes:
the input end of the shunt regulating circuit 400 is electrically connected with the voltage output end of the first-stage buck conversion circuit 200, and the output end of the shunt regulating circuit 400 is electrically connected with the battery, so as to shunt the output current of the first-stage buck conversion circuit 200.
In the embodiment of the disclosure, a shunt regulating circuit can be further arranged to shunt the output current of the first-stage buck conversion circuit, so that the magnitude of the charging current is reduced, and the safe operation of the charging circuit is protected. In addition, the shunt regulation circuit can also realize the functions of trickle, pre-charge, constant current, constant voltage and the like, the shunt regulation circuit can adopt the existing BUCK circuit or charge pump, and can also adopt other circuits, and the embodiment of the disclosure is not particularly limited.
In some embodiments, based on the charging circuit shown in fig. 1, as shown in fig. 3, the charging circuit 1 further includes:
a load switch circuit 500 disposed between the two-stage buck converter circuit 300 and the battery for disconnecting the charging circuit when the output voltage of the two-stage buck converter circuit 300 exceeds a predetermined voltage, or
When the output current of the two-stage buck converter circuit 300 exceeds the preset current, the charging circuit is turned off.
In the embodiment of the disclosure, a load switch circuit can be further arranged to perform overcurrent and overvoltage protection on the charging circuit.
It should be noted that, the charging circuit provided in the embodiment of the present disclosure may further include a plurality of secondary buck conversion circuits and a load switch circuit connected in parallel between the primary buck conversion circuit and the battery of the terminal according to actual requirements, and the embodiment of the present disclosure is not particularly limited.
In a second aspect, an embodiment of the present disclosure provides a terminal including the charging circuit in the embodiment of the present disclosure in the first aspect.
In the embodiment of the present disclosure, the terminal includes, but is not limited to, a smart phone, a tablet computer, a notebook computer, a palm computer, a wearable smart device, and other electric devices. The charging circuit in the embodiment of the disclosure can be widely applied to various terminals.
It should be noted that the charging circuit provided in the embodiments of the present disclosure may also be applied to a power adapter.
In a third aspect, fig. 4 is a schematic flowchart of a control method of a charging circuit according to an embodiment of the present disclosure, as shown in fig. 4, including:
s401, detecting an input voltage value and an output voltage value of a first-stage buck conversion circuit;
in this step, the input voltage value V of the first-stage buck conversion circuit is first detectedINAnd an output voltage value VOUTAnd then the first-stage buck conversion circuit enters a corresponding working state by comparing the sizes of the first-stage buck conversion circuit and the second-stage buck conversion circuit.
S402, if the input voltage value is larger than the output voltage value of the preset multiple, in a first charging period, controlling a first switching tube and a third switching tube in a first-stage buck conversion circuit to be conducted, and controlling a second switching tube and a fourth switching tube to be cut off to charge a first capacitor;
in this step, the preset multiple may be two times, for example, when the input voltage value V is larger than the preset multipleINGreater than twice the output voltage value VOUTAt first charging period T, as shown in FIG. 51In the first step-down conversion circuit, a first switch tube Q is controlled1And a third switching tube Q3Conducting to control the second switch tube Q2And a fourth switching tube Q4Cut-off, at this point node G1Voltage of
Figure BDA0002529100930000091
Node G3Voltage of
Figure BDA0002529100930000092
Node G2Voltage of
Figure BDA0002529100930000093
At this time, the first capacitor C1Starting to charge, the first inductor L1And (6) electrifying.
S403, in a second charging period, controlling the first switching tube to be cut off and controlling the fourth switching tube to be switched on;
in this step, during the second charging period T2In, control the first switch tube Q1Stopping and controlling the fourth switching tube Q4Is turned on when the node G1Voltage of
Figure BDA0002529100930000094
Node G2Voltage of
Figure BDA0002529100930000095
Node G3Voltage of
Figure BDA0002529100930000096
First inductance L1The energization is stopped.
S404, in a third charging period, controlling the second switching tube to be conducted, and controlling the third switching tube to be cut off to discharge the first capacitor;
in this step, during the third charging period T3In, control the second switch tube Q2Conducting to control the third switch tube Q3Cut-off, at this point node G1Voltage of
Figure BDA0002529100930000101
Node G2Voltage of
Figure BDA0002529100930000102
Node G3Voltage of
Figure BDA0002529100930000103
A first capacitor C1Starting to discharge, the first inductor L1The power is restored.
And S405, in a fourth charging period, controlling the second switching tube to be cut off and controlling the third switching tube to be conducted.
In this step, in the fourth charging period T4In, control the second switch tube Q2Cut off and control the third switch tube Q3Is turned on when the node G1Voltage of
Figure BDA0002529100930000104
Node G2Voltage of
Figure BDA0002529100930000105
Node G3Voltage of
Figure BDA0002529100930000106
First inductance L1The energization is stopped.
Further, as shown in FIG. 6, with the input voltage VINIs reduced by a first charging period T1And a third charging period T3The duration of the two periods is prolonged correspondingly, namely the duty ratio of the two periods is improved, and finally the stable output voltage V is obtainedOUTI.e. node G2Voltage of
Figure BDA0002529100930000107
The control method of the charging circuit provided by the embodiment of the disclosure, in combination with the charging circuit provided by the first aspect of the embodiment of the disclosure, reduces the voltage on the inductor and the switching tube of the charging circuit in all working states, doubles the switching frequency at the switching node, and can reduce the maximum current ripple of the inductor to one fourth of that of a common buck converter. Because of the reduction of the current ripple, smaller and thinner inductors can be adopted, the resistance of the coil is reduced, and the power loss is reduced. In addition, the voltage on the inductor and the switching tube of the charging circuit in all working states is reduced, so that the loss of the switching tube is reduced, and the heat generation of the charging circuit is reduced.
In some embodiments, the duration of the first charging period, the second charging period, the third charging period, and the fourth charging period is controlled by the control circuit.
In the embodiment of the present disclosure, a PWM control circuit may be adopted to control the duration of each charging cycle of the one-stage buck conversion circuit.
In some embodiments, the method for controlling a charging circuit further comprises:
and adjusting the duration of the first charging period, the second charging period, the third charging period and the fourth charging period according to the preset relation between the input voltage value and the duration of the charging period.
In this disclosure, the duration of each charging cycle of the first-stage buck conversion circuit may be adjusted according to the input voltage value, for example, the duration of the corresponding charging cycle is set according to a preset proportional relationship between the input voltage value and the duration of the charging cycle, which is not limited in this disclosure.
In some embodiments, on the basis of the control method of the charging circuit shown in fig. 4, as shown in fig. 7, after S401, the method further includes:
s701, if the input voltage value is smaller than the output voltage value of the preset multiple, controlling the first switching tube and the second switching tube to be conducted and controlling the third switching tube and the fourth switching tube to be cut off in a first charging period;
in this step, unlike the control method of the charging circuit shown in fig. 4, when the input voltage value V is detectedINLess than twice the output voltage value VOUTAt first charging period T, as shown in FIG. 81In, control the first switch tube Q1And a second switching tube Q2Conducting to control the third switch tube Q3And a fourth switching tube Q4Cut-off, at this point node G1Voltage of
Figure BDA0002529100930000111
Node G2Voltage of
Figure BDA0002529100930000112
Node G3Voltage of
Figure BDA0002529100930000113
First inductance L1And (6) electrifying.
S702, in a second charging period, controlling the second switching tube to be cut off and controlling the fourth switching tube to be conducted to charge the first capacitor;
in this step, during the second charging period T2In, control the second switch tube Q2Stopping and controlling the fourth switching tube Q4Is turned on when the node G1Voltage of
Figure BDA0002529100930000114
Node G2Voltage of
Figure BDA0002529100930000115
Node G3Voltage of
Figure BDA0002529100930000116
A first capacitor C1Charging, first inductance L1And continuing to electrify.
S703, in a third charging period, controlling the second switching tube to be switched on, and controlling the fourth switching tube to be switched off;
in this step, during the third charging period T3In, control the second switch tube Q2Conducting to control the fourth switch tube Q4Cut-off, at this point node G1Voltage of
Figure BDA0002529100930000117
Node G2Voltage of
Figure BDA0002529100930000118
Node G3Voltage of
Figure BDA0002529100930000119
First inductance L1And continuing to electrify.
And S704, in a fourth charging period, controlling the first switch tube to be cut off, and controlling the fourth switch tube to be conducted, so that the first capacitor is discharged.
In this step, in the fourth charging period T4In, control the first switch tube Q1Stopping and controlling the fourth switching tube Q4The power-on state is carried out,node G at this time1Voltage of
Figure BDA00025291009300001110
Node G2Voltage of
Figure BDA0002529100930000121
Node G3Voltage of
Figure BDA0002529100930000122
A first capacitor C1Starting to discharge, the first inductor L1And continuing to electrify.
Furthermore, with the input voltage VINBy adjusting the duration of each charging cycle, the first switching transistor Q is turned off1And a second switching tube Q2All in the conducting state in the same charging period, thereby leading the node G to be in the conducting state2At a voltage of VINAnd VINAlternating between/2.
In a fourth aspect, fig. 9 is a block diagram of a control device of a charging circuit according to an embodiment of the present disclosure, where the control device includes:
a detecting unit 910, configured to detect an input voltage value and an output voltage value of the first-stage buck conversion circuit;
the control unit 920 is configured to, if the input voltage value is greater than the output voltage value of the preset multiple, control the first switching tube and the third switching tube in the first-stage buck conversion circuit to be turned on and control the second switching tube and the fourth switching tube to be turned off in the first charging period, so as to charge the first capacitor;
in a second charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on;
in a third charging period, the second switching tube is controlled to be conducted, and the third switching tube is controlled to be cut off, so that the first capacitor is discharged;
and in the fourth charging period, the second switching tube is controlled to be switched off, and the third switching tube is controlled to be switched on.
In some embodiments, the control unit 920 is further configured to:
if the input voltage value is smaller than the output voltage value of the preset multiple, the first switching tube and the second switching tube are controlled to be conducted, and the third switching tube and the fourth switching tube are controlled to be cut off in a first charging period;
in a second charging period, the second switching tube is controlled to be cut off, and the fourth switching tube is controlled to be conducted, so that the first capacitor is charged;
in a third charging period, controlling the second switching tube to be switched on and controlling the fourth switching tube to be switched off;
and in the fourth charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on, so that the first capacitor is discharged.
The control device of the charging circuit provided by the embodiment of the disclosure, in combination with the charging circuit provided by the first aspect of the embodiment of the disclosure, reduces the voltage on the inductor and the switching tube of the charging circuit in all working states, doubles the switching frequency at the switching node, and can reduce the maximum current ripple of the inductor to one fourth of that of a common buck converter. Because of the reduction of the current ripple, smaller and thinner inductors can be adopted, the resistance of the coil is reduced, and the power loss is reduced. In addition, the voltage on the inductor and the switching tube of the charging circuit in all working states is reduced, so that the loss of the switching tube is reduced, and the heat generation of the charging circuit is reduced.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents does not depart from the spirit of the disclosure. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.

Claims (10)

1. A charging circuit, comprising:
a control circuit for generating a periodic control signal;
the input end of the first-stage buck conversion circuit is electrically connected with the output end of the control circuit and is used for carrying out buck on input voltage based on the periodic control signal;
the input end of the second step-down conversion circuit is electrically connected with the voltage output end of the first step-down conversion circuit, and the output end of the second step-down conversion circuit is electrically connected with a battery of a terminal and is used for reducing the output voltage of the first step-down conversion circuit;
wherein, one-level buck conversion circuit includes:
the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are sequentially connected in series; the drain electrode of the first switching tube is connected with a voltage input end;
the first capacitor is connected with the second switching tube and the third switching tube in parallel;
a first end of the first inductor is connected with a node between the second switching tube and the third switching tube;
a first end of the second capacitor is connected with a second end of the first inductor, and a second end of the second capacitor is grounded; wherein a node between the first inductor and the second capacitor is connected with a voltage output end.
2. The charging circuit of claim 1, further comprising:
shunt regulator circuit, shunt regulator circuit's input with one-level step-down converting circuit's voltage output end electricity is connected, shunt regulator circuit's output with the battery electricity is connected, is used for right one-level step-down converting circuit's output current shunts.
3. The charging circuit of claim 2, further comprising:
a load switch circuit arranged between the secondary buck conversion circuit and the battery for disconnecting the charging circuit when the output voltage of the secondary buck conversion circuit exceeds a preset voltage, or
And when the output current of the secondary buck conversion circuit exceeds a preset current, the charging circuit is disconnected.
4. A terminal, characterized in that it comprises a charging circuit according to any one of claims 1 to 3.
5. A method of controlling a charging circuit, comprising:
detecting an input voltage value and an output voltage value of a first-stage buck conversion circuit;
if the input voltage value is larger than the output voltage value of a preset multiple, in a first charging period, controlling a first switching tube and a third switching tube in the first-stage buck conversion circuit to be conducted, and controlling a second switching tube and a fourth switching tube to be cut off, so that a first capacitor is charged;
in a second charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on;
in a third charging period, controlling the second switching tube to be switched on, and controlling the third switching tube to be switched off to discharge the first capacitor;
and in a fourth charging period, the second switching tube is controlled to be switched off, and the third switching tube is controlled to be switched on.
6. The method of claim 5, wherein the duration of the first charge cycle, the second charge cycle, the third charge cycle, and the fourth charge cycle is controlled by a control circuit.
7. The method of claim 6, further comprising:
and adjusting the duration of the first charging period, the second charging period, the third charging period and the fourth charging period according to the preset relationship between the input voltage value and the duration of the charging period.
8. The method of claim 5, further comprising, after said detecting the input voltage and the output voltage of the one-stage buck converter circuit:
if the input voltage value is smaller than the output voltage value of a preset multiple, controlling the first switching tube and the second switching tube to be conducted and controlling the third switching tube and the fourth switching tube to be cut off in a first charging period;
in a second charging period, the second switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on, so that the first capacitor is charged;
in a third charging period, controlling the second switching tube to be switched on and controlling the fourth switching tube to be switched off;
and in a fourth charging period, the first switch tube is controlled to be cut off, and the fourth switch tube is controlled to be switched on, so that the first capacitor is discharged.
9. A control device for a charging circuit, comprising:
the detection unit is used for detecting the input voltage value and the output voltage value of the first-stage buck conversion circuit;
the control unit is used for controlling a first switching tube and a third switching tube in the first-stage buck conversion circuit to be switched on and controlling a second switching tube and a fourth switching tube to be switched off in a first charging period if the input voltage value is larger than the output voltage value of a preset multiple, so that a first capacitor is charged;
in a second charging period, the first switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on;
in a third charging period, controlling the second switching tube to be switched on, and controlling the third switching tube to be switched off to discharge the first capacitor;
and in a fourth charging period, the second switching tube is controlled to be switched off, and the third switching tube is controlled to be switched on.
10. The apparatus of claim 9, wherein the control unit is further to:
if the input voltage value is smaller than the output voltage value of a preset multiple, controlling the first switching tube and the second switching tube to be conducted and controlling the third switching tube and the fourth switching tube to be cut off in a first charging period;
in a second charging period, the second switching tube is controlled to be switched off, and the fourth switching tube is controlled to be switched on, so that the first capacitor is charged;
in a third charging period, controlling the second switching tube to be switched on and controlling the fourth switching tube to be switched off;
and in a fourth charging period, the first switch tube is controlled to be cut off, and the fourth switch tube is controlled to be switched on, so that the first capacitor is discharged.
CN202010513423.9A 2020-06-08 2020-06-08 Charging circuit, terminal, and control method and device of charging circuit Pending CN111697647A (en)

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CN113162394A (en) * 2021-04-27 2021-07-23 合肥联宝信息技术有限公司 Adapter and electronic equipment
CN113507149A (en) * 2021-06-29 2021-10-15 珠海智融科技有限公司 Mixed-mode charging circuit and charging method
CN113572242A (en) * 2021-09-26 2021-10-29 广东希荻微电子股份有限公司 Charging circuit and integrated chip
CN113824196A (en) * 2021-11-19 2021-12-21 广东希荻微电子股份有限公司 Battery charging circuit, device and terminal equipment
CN113839458A (en) * 2021-08-31 2021-12-24 深圳市雅晶源科技有限公司 Super quick charger based on gallium nitride
WO2022105503A1 (en) * 2020-11-20 2022-05-27 Oppo广东移动通信有限公司 Charging circuit, electronic device and charging apparatus
CN115001062A (en) * 2021-09-10 2022-09-02 荣耀终端有限公司 Charging management circuit and electronic device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022105503A1 (en) * 2020-11-20 2022-05-27 Oppo广东移动通信有限公司 Charging circuit, electronic device and charging apparatus
CN113162394A (en) * 2021-04-27 2021-07-23 合肥联宝信息技术有限公司 Adapter and electronic equipment
CN113162394B (en) * 2021-04-27 2022-04-26 合肥联宝信息技术有限公司 Adapter and electronic equipment
CN113507149A (en) * 2021-06-29 2021-10-15 珠海智融科技有限公司 Mixed-mode charging circuit and charging method
CN113839458A (en) * 2021-08-31 2021-12-24 深圳市雅晶源科技有限公司 Super quick charger based on gallium nitride
CN113839458B (en) * 2021-08-31 2023-02-14 深圳市雅晶源科技有限公司 Super quick charger based on gallium nitride
CN115001062A (en) * 2021-09-10 2022-09-02 荣耀终端有限公司 Charging management circuit and electronic device
CN113572242A (en) * 2021-09-26 2021-10-29 广东希荻微电子股份有限公司 Charging circuit and integrated chip
CN113824196A (en) * 2021-11-19 2021-12-21 广东希荻微电子股份有限公司 Battery charging circuit, device and terminal equipment
CN113824196B (en) * 2021-11-19 2022-03-11 广东希荻微电子股份有限公司 Battery charging circuit, device and terminal equipment
WO2023151375A1 (en) * 2022-02-11 2023-08-17 Oppo广东移动通信有限公司 Power source circuit and electronic device

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