CN117767511A - Charger current control circuit, charger and charging method - Google Patents
Charger current control circuit, charger and charging method Download PDFInfo
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Abstract
The application discloses charger current control circuit, charger and charging method, detect secondary side voltage through auxiliary winding coil, control module changes CS resistance module's resistance value, detect primary side current by PWM drive MOS switch again to control transformer electric energy release state, realized whether control transformer releases electric energy according to secondary side voltage (output voltage), in order to avoid output voltage to lead to output current too big, and can control transformer pause release electric energy under the too big circumstances of output current, thereby avoid the components and parts to appear the too high phenomenon of temperature.
Description
Technical Field
The application relates to the technical field of charging control, in particular to a charger current control circuit, a charger and a charging method.
Background
At present, in a charging scheme below 65 watts in the PD (Power Delivery) fast charging industry, primary side currents corresponding to different output voltages are quite different. Taking PD 65W charging as an example, the charger satisfies the maximum power output, and when the output voltage is 5V3, the output current of the transformer is as high as 10A or more, but does not meet the 8A requirement specified by the limited power supply test (Limited power sources, LPS). And, in transformer overload experiments and LSP tests, the temperatures of certain devices and housings do not meet specification requirements.
Disclosure of Invention
The application provides a charger current control circuit, a charger and a charging method, which are used for solving the technical problem that the output current and the temperature of components are not in accordance with the specification requirements due to large primary side current difference corresponding to different output voltages.
In order to solve the technical problem, in a first aspect, the present application provides a charger current control circuit, including a control module, a PWM driving MOS switch, a transformer, and a CS resistor module, where the transformer includes an auxiliary winding coil;
the auxiliary winding coil is used for detecting secondary side voltage;
the control module is used for changing the resistance value of the CS resistance module according to the secondary side voltage;
the PWM driving MOS switch is used for changing primary side current according to the resistance value of the CS resistance module and controlling the electric energy release state of the transformer according to the primary side current;
the transformer is used for storing electric energy or releasing electric energy.
According to the charger current control circuit, the secondary side voltage is detected through the auxiliary winding coil, the resistance value of the CS resistance module is changed by the control module, then the primary side current is detected by the PWM driving MOS switch, and the electric energy release state of the transformer is controlled, so that whether the transformer releases electric energy or not is controlled according to the secondary side voltage (output voltage), the output current is prevented from being overlarge due to the output voltage, the transformer can be controlled to suspend releasing the electric energy under the condition that the output current is overlarge, and the phenomenon that the temperature of components is overlarge is avoided.
In some embodiments of the first aspect, the control module is provided with a zener diode and a first MOS transistor, and the CS resistor module is provided with a second MOS transistor, a first CS resistor and a plurality of second CS resistors;
the zener diode is configured to provide a driving voltage to the first MOS transistor when the secondary side voltage is greater than a preset threshold;
the first MOS tube is used for controlling the conduction state of the second MOS tube according to the driving voltage;
the second MOS tube is used for controlling the working state of the second CS resistor based on the conducting state.
In the embodiment, the on state of the second MOS tube is controlled through the on state of the first MOS tube, and then whether the second CS resistor is added into a circuit to work is controlled, so that the circuit resistance value is realized by utilizing the difference of the circuit resistance quantity, and the primary side current is changed.
In some embodiments of the first aspect, the first MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor, and the second MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor;
when the first MOS tube and the second MOS tube are both N-channel MOS tubes, the first MOS tube is conducted after the voltage stabilizing diode releases the driving voltage, the second MOS tube is cut off, the first CS resistor enters a working state, and the second CS resistor does not enter the working state;
when the first MOS tube is an N-channel MOS tube and the second MOS tube is a P-channel MOS tube, the first MOS tube is conducted after the voltage stabilizing diode releases the driving voltage, the second MOS tube is conducted, and the first CS resistor and the second CS resistor both enter a working state;
when the first MOS tube and the second MOS tube are both P-channel MOS tubes, after the voltage stabilizing diode releases the driving voltage, the first MOS tube is cut off, the second MOS tube is cut off, the first CS resistor enters a working state, and the second CS resistor does not enter the working state;
when the first MOS tube is a P-channel MOS tube and the second MOS tube is an N-channel MOS tube, the voltage stabilizing diode is turned off after releasing the driving voltage, the second MOS tube is turned on, and the first CS resistor and the second CS resistor enter a working state.
In some embodiments of the first aspect, a gate of the second MOS transistor is connected to a cathode of the zener diode, a drain of the second MOS transistor is connected to one end of the second CS resistor, a source of the second MOS transistor is connected to one end of the first CS resistor, the other end of the second CS resistor and the other end of the first CS resistor are connected to a CS pin of the PWM driving MOS switch, and the source of the second MOS transistor and one end of the first CS resistor are grounded.
In some embodiments of the first aspect, the control module is further provided with a first resistor and a second resistor, an anode of the zener diode is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor and a gate of the first MOS transistor, the other end of the second resistor is connected to the auxiliary winding coil and a drain of the first MOS transistor, a cathode of the zener diode is further connected to a source of the first MOS transistor, and the other end of the second resistor is grounded to the drain of the first MOS transistor.
In some embodiments of the first aspect, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a first diode are further arranged between the other end of the second resistor and the auxiliary winding coil; a fifth resistor, an N-type triode and a sixth resistor are further arranged between the cathode of the voltage stabilizing diode and the source electrode of the first MOS tube;
one end of the third resistor is connected with the auxiliary winding coil, the other end of the third resistor is connected with one end of the first capacitor and the positive electrode of the first diode, the other end of the first capacitor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the negative electrode of the first diode, one end of the second capacitor, one end of the fifth resistor and the collector electrode of the N-type triode, and the other end of the second capacitor is connected with the other end of the second resistor;
the other end of the fifth resistor is connected with the negative electrode of the voltage stabilizing diode and the grid electrode of the N-type triode, the emitting electrode of the N-type triode is connected with one end of the sixth resistor, and the other end of the sixth resistor is connected with the source electrode of the first MOS tube.
In some embodiments of the first aspect, the charger current control circuit further comprises a rectification module and a fast charging protocol module;
the rectification module is used for converting the electric energy released by the transformer into direct-current voltage;
and the fast charging protocol module is used for charging the terminal equipment according to the direct-current voltage.
In a second aspect, the present application further provides a charger, including the charger current control circuit of the first aspect.
In a third aspect, the present application further provides a charging method applied to the charger described in the second aspect, the method including:
detecting a secondary side voltage, and changing the resistance value of the CS resistance module according to the secondary side voltage;
changing primary side current according to the resistance value of the CS resistance module;
controlling the electric energy release state of the transformer according to the primary side current;
converting the electric energy released by the transformer into direct-current voltage;
and charging the terminal equipment according to the direct-current voltage.
According to the charging method, the secondary side voltage is detected to change the resistance value of the CS resistance module, the primary side current is detected again, and the electric energy release state of the transformer is controlled, so that whether the transformer releases electric energy or not is controlled according to the secondary side voltage (output voltage), the output current is prevented from being overlarge due to the output voltage, the transformer is controlled to suspend releasing the electric energy under the condition that the output current is overlarge, and the phenomenon that the temperature of components is overlarge is avoided.
In some embodiments of the third aspect, the controlling the power release state of the transformer according to the primary side current includes:
when the PWM controller detects that the circuit working condition is met according to the primary side current, the PWM drives the MOS switch to be conducted so as to control the transformer to convert electric energy into magnetic field energy for storage;
and when the PWM controller detects that the primary side current does not meet the working condition of the circuit, the PWM drives the MOS switch to cut off, and when the rectifying module works, the transformer is controlled to release electric energy.
The PWM controller of the embodiment controls whether the PWM driving MOS switch is conducted or not by detecting whether the primary side current meets the working condition of the circuit or not, thereby realizing the control of the electric energy release state of the transformer.
Drawings
Fig. 1 is a schematic diagram of a charger current control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a charger current control circuit according to another embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a CS resistor module according to an embodiment of the present disclosure;
FIG. 4 is a schematic circuit diagram of a control module according to an embodiment of the disclosure;
fig. 5 is a schematic circuit diagram of a control module according to another embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a charger current control circuit according to another embodiment of the present application;
fig. 7 is a schematic circuit diagram of a charger current control circuit according to an embodiment of the present application;
fig. 8 is a flow chart of a charging method according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 shows a schematic configuration of a charger current control circuit according to the present embodiment. The charger current control circuit comprises a control module 1, a PWM driving MOS switch 2, a transformer 3 and a CS resistance module 4, wherein the transformer 3 comprises an auxiliary winding coil 31;
the auxiliary winding coil 31 for detecting a secondary side voltage;
the control module 1 is configured to change a resistance value of the CS resistance module 4 according to the secondary side voltage;
the PWM driving MOS switch 2 is configured to change a primary current according to a resistance value of the CS resistance module 4, and control an electric energy release state of the transformer 3 according to the primary current;
the transformer 3 is used for storing electric energy or releasing electric energy.
In the present embodiment, the transformer 3 is a device for converting an ac voltage using the principle of electromagnetic induction, and generally includes a primary winding coil and a secondary winding coil on a primary side, and the present embodiment further provides an auxiliary winding coil 31 on the primary side to detect a winding voltage on the secondary side, thereby realizing detection of an output voltage.
The CS resistance module 4 may include a plurality of current sense resistors (Current Sense Resistor, CS resistances) with a parallel circuit therebetween. The control module 1 may include a plurality of elements having a switching function, such as a diode and a triode, so as to be able to control whether each CS resistor is added to the circuit to increase or decrease the circuit resistance value, thereby implementing the change of the resistance value of the CS resistor module 4.
The PWM driving MOS switch 2 is a switch that integrates a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS transistor) into a pulse width modulation (Pulse width modulation, PWM) chip (or PWM controller), and has the same conduction condition as a normal MOS transistor. Optionally, the MOS transistor of the PWM driving MOS switch 2 in this embodiment is an N-channel MOS transistor, a CS (current sensor) pin of the PWM chip is used as a source of the MOS transistor, and two OC (output comparison) pins of the PWM chip are used as drains; when the PWM controller detects that the circuit meets the working condition according to the primary side current, the driving pin of the PWM chip provides voltage to the grid electrode of the MOS tube, namely the PWM drives the MOS switch 2 to be conducted, so that the PWM controller is used as a switch for controlling whether the transformer 3 releases electric energy or not.
Alternatively, for some circuit configurations, the transformer 3 discharges electrical energy when the PWM driving MOS switch 2 is turned on, and the transformer 3 stores electrical energy when the PWM driving MOS switch 2 is turned off; for other circuit structures, when the PWM driving MOS switch 2 is turned off, the transformer 3 releases electric energy, and when the PWM driving MOS switch 2 is turned on, the transformer stores 3 electric energy.
The charger current control circuit detects the secondary side voltage through the auxiliary winding coil 31, the control module 1 changes the resistance value of the CS resistance module 4, then the PWM drives the MOS switch 2 to detect the primary side current and controls the electric energy release state of the transformer 3, so as to control whether the transformer 3 releases electric energy according to the secondary side voltage (output voltage) or not, so as to avoid overlarge output current caused by the output voltage, and control the transformer 3 to pause releasing electric energy under the condition of overlarge output current, thereby avoiding the phenomenon of overhigh temperature of components.
Referring to fig. 2, fig. 2 shows a schematic structural diagram of the control module 1. In some embodiments, the control module 1 is provided with a zener diode and a first MOS transistor, and the CS resistor module 4 is provided with a second MOS transistor, a first CS resistor and a plurality of second CS resistors;
the zener diode is configured to provide a driving voltage to the first MOS transistor when the secondary side voltage is greater than a preset threshold;
the first MOS tube is used for controlling the conduction state of the second MOS tube according to the driving voltage;
the second MOS tube is used for controlling the working state of the second CS resistor based on the conducting state.
In this embodiment, optionally, the first MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor, the second MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor, and a cathode of the zener diode is connected to a source of the first MOS transistor and connected to a gate of the second MOS transistor.
When the first MOS tube and the second MOS tube are both N-channel MOS tubes, after the voltage stabilizing diode releases the driving voltage, the source voltage of the first MOS tube is increased, so that the voltage (Vgs) between the source and the grid of the first MOS tube is larger than the threshold voltage (Vth), and the source and the drain are conducted; at this time, the grid electrode of the second MOS tube is connected with the voltage stabilizing diode, and the on-resistance is very large, so that the current does not pass through the second MOS tube, the second MOS tube is cut off, the first CS resistor is added into the circuit to enter the working state, and the second CS resistor is not added into the circuit to enter the working state.
When the first MOS tube is an N-channel MOS tube and the second MOS tube is a P-channel MOS tube, the voltage stabilizing diode is conducted after the driving voltage is released; at this time, the gate of the second MOS transistor is connected to the zener diode, and the voltage between the gate and the source thereof decreases, so that the voltage (Vgs) between the source and the gate of the first MOS transistor is less than the threshold voltage (Vth), the second MOS transistor is turned on, and both the first CS resistor and the second CS resistor enter the working state.
When the first MOS tube and the second MOS tube are P-channel MOS tubes, after the voltage stabilizing diode releases the driving voltage, the first MOS tube is cut off, the second MOS tube is cut off, the first CS resistor enters a working state, and the second CS resistor does not enter the working state.
When the first MOS tube is a P-channel MOS tube and the second MOS tube is an N-channel MOS tube, the voltage stabilizing diode is turned off after releasing the driving voltage, the second MOS tube is turned on, and the first CS resistor and the second CS resistor enter a working state.
In the embodiment, the on state of the second MOS tube is controlled through the on state of the first MOS tube, and then whether the second CS resistor is added into a circuit to work is controlled, so that the circuit resistance value is realized by utilizing the difference of the circuit resistance quantity, and the primary side current is changed.
Referring to fig. 3, fig. 3 shows a schematic circuit configuration of the CS resistor module 4. In some embodiments, the gate G of the second MOS transistor Q3 is connected to the negative electrode of the zener diode ZD1, the drain D of the second MOS transistor Q3 is connected to one end of the second CS resistor RS3, the source S of the second MOS transistor Q3 is connected to one end of the first CS resistor RS1/RS2, the other end of the second CS resistor RS3 and the other end of the first CS resistor RS1/RS2 are connected to the CS pin of the PWM driving MOS switch 2, and the source S of the second MOS transistor Q3 and one end of the first CS resistor RS1/RS2 are grounded.
In this embodiment, when the second MOS transistor Q3 is turned on, the second CS resistor RS3 and the first CS resistor RS1/RS2 form a parallel circuit, so that the circuit resistance value is adjusted by the second CS resistor RS3 and the first CS resistor RS1/RS 2. When the second MOS transistor Q3 is cut off, the second CS resistor RS3 is disconnected, so that the circuit resistance value is regulated by the first CS resistor RS1/RS 2.
Referring to fig. 4, fig. 4 shows a schematic circuit configuration of the control module 1. In some embodiments, the control module 1 is further provided with a first resistor R41 and a second resistor R42, the positive electrode of the zener diode ZD1 is connected to one end of the first resistor R41, the other end of the first resistor R41 is connected to one end of the second resistor R42 and the gate G of the first MOS transistor Q2, the other end of the second resistor R42 is connected to the auxiliary winding coil 31 (vs+) and the drain D of the first MOS transistor Q2, the negative electrode of the zener diode ZD1 is further connected to the source S of the first MOS transistor Q2, and the other end of the second resistor R42 is grounded to the drain of the first MOS transistor Q2.
In this embodiment, when the first resistor R1 and the second resistor R2 are added to the circuit to enable the zener diode ZD1 to release the driving voltage, the conduction voltage between the source S and the gate G of the first MOS transistor Q2 is increased, and the drain voltage is reduced, so as to control the conduction of the first MOS transistor Q2.
Referring to fig. 5, fig. 5 shows another circuit configuration of the control module 1 based on fig. 4. In some embodiments, a third resistor R17, a first capacitor C3 and a first diode D2 are further disposed between the other end of the second resistor R42 and the auxiliary winding coil 31 (vs+); a fourth resistor R4, an N-type triode Q1 and a fifth resistor R43 are further arranged between the cathode of the zener diode ZD1 and the source electrode S of the first MOS tube Q2;
one end of the third resistor R17 is connected to the auxiliary winding coil 31 (vs+), the other end of the third resistor R17 is connected to the positive electrode of the first diode D2, the negative electrode of the first diode D2 is connected to one end of the first capacitor C3, one end of the fourth resistor R4, and the collector of the N-type triode Q1, and the other end of the first capacitor C3 is connected to the other end of the second resistor R42;
the other end of the fourth resistor R4 is connected to the cathode of the zener diode ZD1 and the gate of the N-type triode Q1, the emitter of the N-type triode Q1 is connected to one end of the fifth resistor R43, and the other end of the fifth resistor R43 is connected to the source S of the first MOS transistor Q2.
In this embodiment, the third resistor R17 protects the control module, so as to avoid abnormality of the control module caused by excessive voltage of the auxiliary winding coil 31, and the first diode D2 is turned on when the voltage increases to a preset threshold value, so that the auxiliary winding coil 31 is communicated with the zener diode ZD 1; the second capacitor C3 stores electric energy before the N-type triode is not conducted; when the auxiliary winding coil 31 continues to increase, the zener diode ZD1 releases the driving voltage, the N-type transistor is turned on, and the N-type transistor is connected to the source S of the first MOS transistor Q2 through the fifth resistor R43.
Optionally, the positive electrode of the first diode D2 is connected to one end of the second capacitor, the negative electrode of the first diode D2 is connected to one end of the sixth resistor, and the other end of the second capacitor is connected to the other end of the sixth resistor. The second capacitor is used for voltage spike absorption across the first diode D2.
Referring to fig. 6, fig. 6 shows another structural schematic of the charger current control circuit. In some embodiments, the charger current control circuit further comprises a rectifying module 5 and a fast charging protocol module 6;
the rectification module 5 is used for converting the electric energy released by the transformer 3 into direct-current voltage;
the fast charging protocol module 6 is configured to charge a terminal device according to the dc voltage.
In this embodiment, the ac power released by the transformer 3 is converted into a constant dc power by the rectifying module 5, and then handshakes with the terminal device by the fast charging protocol module 6 through a handshaking protocol, and the dc power satisfying the fast charging protocol is transmitted to the terminal device for charging.
The application also provides a charger comprising the charger current control circuit described in the embodiments of fig. 1 to 6. Alternatively, the charger current control circuit of the present embodiment is shown in fig. 7, in which the circuit structure of the fast charging protocol module adopts a known circuit structure, which is not shown here. It will be appreciated that the charger may include a processor, such as a single-chip microcomputer, to control the operation of the various modules in the charger current control circuit, and a memory to store a computer program for controlling the operation of the charger current control circuit.
Referring to fig. 8, fig. 8 shows a flowchart of a charging method according to an embodiment of the present application. The charging method can be applied to the charger, and comprises the following steps:
step S101, detecting secondary side voltage, and changing the resistance value of a CS resistance module according to the secondary side voltage;
step S102, changing primary side current according to the resistance value of the CS resistance module;
step S103, controlling the electric energy release state of the transformer according to the primary side current;
step S104, converting the electric energy released by the transformer into direct-current voltage;
step S105, charging the terminal device according to the dc voltage.
In this embodiment, by detecting the secondary side voltage to change the resistance value of the CS resistor module, detecting the primary side current again, and controlling the transformer power release state, it is achieved whether the transformer releases power according to the secondary side voltage (output voltage) so as to avoid the output current from being too large due to the output voltage, and controlling the transformer to suspend releasing power under the condition that the output current is too large, thereby avoiding the phenomenon that the temperature of the components is too high.
In some embodiments, the controlling the power release state of the transformer according to the primary side current includes:
when the PWM controller detects that the circuit working condition is met according to the primary side current, the PWM drives the MOS switch to be conducted so as to control the transformer to convert electric energy into magnetic field energy for storage;
when the PWM controller detects that the primary side current does not meet the working condition of the circuit, the PWM drives the MOS switch to cut off, and when the rectifying module works, the transformer is controlled to release electric energy.
In the embodiment, whether the primary side current is larger than the preset current threshold value or not is controlled to control the conduction of the PWM driving MOS switch, so that the electric energy release state of the transformer is controlled.
It should be understood that the explanation of the embodiments of the present application may refer to the content of the above-mentioned circuit embodiments, and in this embodiment, no further description is given.
In several embodiments provided herein, it will be understood that each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device to perform all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing embodiments have been provided for the purpose of illustrating the objects, technical solutions and advantages of the present application in further detail, and it should be understood that the foregoing embodiments are merely examples of the present application and are not intended to limit the scope of the present application. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which are within the spirit and principles of the present application, are intended to be included within the scope of the present application.
Claims (10)
1. The charger current control circuit is characterized by comprising a control module, a PWM driving MOS switch, a transformer and a CS resistance module, wherein the transformer comprises an auxiliary winding coil;
the auxiliary winding coil is used for detecting secondary side voltage;
the control module is used for changing the resistance value of the CS resistance module according to the secondary side voltage;
the PWM driving MOS switch is used for changing primary side current according to the resistance value of the CS resistance module and controlling the electric energy release state of the transformer according to the primary side current;
the transformer is used for storing electric energy or releasing electric energy.
2. The charger current control circuit of claim 1 wherein the control module is provided with a zener diode and a first MOS transistor, and the CS resistor module is provided with a second MOS transistor, a first CS resistor and a plurality of second CS resistors;
the zener diode is configured to provide a driving voltage to the first MOS transistor when the secondary side voltage is greater than a preset threshold;
the first MOS tube is used for controlling the conduction state of the second MOS tube according to the driving voltage;
the second MOS tube is used for controlling the working state of the second CS resistor based on the conducting state.
3. The charger current control circuit of claim 2 wherein the first MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor and the second MOS transistor is an N-channel MOS transistor or a P-channel MOS transistor;
when the first MOS tube and the second MOS tube are both N-channel MOS tubes, the first MOS tube is conducted after the voltage stabilizing diode releases the driving voltage, the second MOS tube is cut off, the first CS resistor enters a working state, and the second CS resistor does not enter the working state;
when the first MOS tube is an N-channel MOS tube and the second MOS tube is a P-channel MOS tube, the first MOS tube is conducted after the voltage stabilizing diode releases the driving voltage, the second MOS tube is conducted, and the first CS resistor and the second CS resistor both enter a working state;
when the first MOS tube and the second MOS tube are both P-channel MOS tubes, after the voltage stabilizing diode releases the driving voltage, the first MOS tube is cut off, the second MOS tube is cut off, the first CS resistor enters a working state, and the second CS resistor does not enter the working state;
when the first MOS tube is a P-channel MOS tube and the second MOS tube is an N-channel MOS tube, the voltage stabilizing diode is turned off after releasing the driving voltage, the second MOS tube is turned on, and the first CS resistor and the second CS resistor enter a working state.
4. The charger current control circuit of claim 2 wherein the gate of the second MOS transistor is connected to the cathode of the zener diode, the drain of the second MOS transistor is connected to one end of the second CS resistor, the source of the second MOS transistor is connected to one end of the first CS resistor, the other end of the second CS resistor and the other end of the first CS resistor are connected to the CS pin of the PWM driving MOS switch, and the source of the second MOS transistor and one end of the first CS resistor are grounded.
5. The charger current control circuit of claim 4 wherein the control module is further provided with a first resistor and a second resistor, the positive electrode of the zener diode is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor and the gate of the first MOS transistor, the other end of the second resistor is connected to the auxiliary winding coil and the drain of the first MOS transistor, the negative electrode of the zener diode is further connected to the source of the first MOS transistor, and the other end of the second resistor is grounded to the drain of the first MOS transistor.
6. The charger current control circuit of claim 5 wherein a third resistor, a first capacitor and a first diode are further provided between the other end of the second resistor and the auxiliary winding coil; a fourth resistor, an N-type triode and a fifth resistor are further arranged between the cathode of the voltage stabilizing diode and the source electrode of the first MOS tube;
one end of the third resistor is connected with the auxiliary winding coil, the other end of the third resistor is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with one end of the first capacitor, one end of the fourth resistor and the collector electrode of the N-type triode, and the other end of the first capacitor is connected with the other end of the second resistor;
the other end of the fourth resistor is connected with the negative electrode of the voltage stabilizing diode and the grid electrode of the N-type triode, the emitting electrode of the N-type triode is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the source electrode of the first MOS tube.
7. The charger current control circuit of claim 1 wherein said charger current control circuit further comprises a rectifier module and a fast charge protocol module;
the rectification module is used for converting the electric energy released by the transformer into direct-current voltage;
and the fast charging protocol module is used for charging the terminal equipment according to the direct-current voltage.
8. A charger comprising the charger current control circuit of any one of claims 1 to 7.
9. A charging method applied to the charger of claim 8, the method comprising:
detecting a secondary side voltage, and changing the resistance value of the CS resistance module according to the secondary side voltage;
changing primary side current according to the resistance value of the CS resistance module;
controlling the electric energy release state of the transformer according to the primary side current;
converting the electric energy released by the transformer into direct-current voltage;
and charging the terminal equipment according to the direct-current voltage.
10. The charging method according to claim 9, wherein said controlling the power release state of the transformer according to the primary side current includes:
when the PWM controller detects that the circuit working condition is met according to the primary side current, the PWM drives the MOS switch to be conducted so as to control the transformer to convert electric energy into magnetic field energy for storage;
when the PWM controller detects that the primary side current does not meet the working condition of the circuit, the PWM drives the MOS switch to cut off, and when the rectifying module works, the transformer is controlled to release electric energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469897.8A CN117767511A (en) | 2023-11-07 | 2023-11-07 | Charger current control circuit, charger and charging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311469897.8A CN117767511A (en) | 2023-11-07 | 2023-11-07 | Charger current control circuit, charger and charging method |
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| Publication Number | Publication Date |
|---|---|
| CN117767511A true CN117767511A (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311469897.8A Pending CN117767511A (en) | 2023-11-07 | 2023-11-07 | Charger current control circuit, charger and charging method |
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| Country | Link |
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| CN (1) | CN117767511A (en) |
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