CN116722630A - Self-adaptive charging circuit based on field effect transistor - Google Patents
Self-adaptive charging circuit based on field effect transistor Download PDFInfo
- Publication number
- CN116722630A CN116722630A CN202310981169.9A CN202310981169A CN116722630A CN 116722630 A CN116722630 A CN 116722630A CN 202310981169 A CN202310981169 A CN 202310981169A CN 116722630 A CN116722630 A CN 116722630A
- Authority
- CN
- China
- Prior art keywords
- resistor
- module
- current
- capacitor
- field effect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007600 charging Methods 0.000 title claims abstract description 67
- 230000005669 field effect Effects 0.000 title claims abstract description 50
- 239000003990 capacitor Substances 0.000 claims abstract description 106
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 230000003044 adaptive effect Effects 0.000 claims abstract description 17
- 238000010277 constant-current charging Methods 0.000 claims abstract description 4
- 230000009125 negative feedback regulation Effects 0.000 claims abstract description 3
- 230000001629 suppression Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- 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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
Abstract
The invention relates to the field of electronic circuits, in particular, but not exclusively, to an adaptive charging circuit based on a field effect transistor, comprising: the power supply module, the current sampling negative feedback module, the current limiting constant current module and the capacitor module are electrically connected in sequence; the power supply module is used for providing a charging power supply; the current sampling negative feedback module is used for carrying out negative feedback adjustment according to the charging current; the current-limiting constant-current module comprises a current-limiting unit, and the current-limiting unit is used for limiting charging current based on negative feedback regulation of the current sampling negative feedback module so as to realize constant-current charging of the capacitor module; therefore, the self-adaptive limiting of the heavy current charging phenomenon is facilitated, the constant current is used for charging, instant current overshoot in the charging process is avoided, and the service life of the capacitor module is prolonged.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to an adaptive charging circuit based on a field effect transistor, which is not limited by the field effect transistor.
Background
In the case of sudden power failure of electric power intelligent terminals or electric equipment such as a transformer intelligent fusion terminal, a private transformer acquisition terminal, a concentrator and the like, real demands such as information transmission, current data storage and the like are always met when the power is off, and a capacitor is a key device for solving the demands. The capacitor has extremely excellent charge and discharge performance, and can be charged and discharged at extremely high speed within a rated voltage range. When discharging, all the stored energy can be discharged, and when charging, the control circuit can turn off the charging circuit when the capacitor charging voltage reaches the upper limit of the capacitor design, and the charging is stopped, so that the capacitor is prevented from being overcharged and damaged.
The current charging mode of the capacitor basically adopts a special capacitor charging chip or adopts a power conversion chip with an instantaneous current limiting function for charging. The following disadvantages exist when the special capacitor charging chip or the power conversion chip with instantaneous current limiting function is used for charging: the special capacitor charging chip is high in price and complex in circuit. The power conversion chip with the instantaneous current limiting function is not good in self-discharge compensation control of the capacitor, and even if the input power supply is stable, the phenomenon of large current charging of the capacitor can occur due to self-discharge of the capacitor, and the service life of the capacitor can be influenced at high temperature. Direct power is also available, which is low cost but energy efficient.
Disclosure of Invention
The invention aims to provide a self-adaptive charging circuit based on a field effect transistor, which is beneficial to realizing self-adaptive limiting of a heavy current charging phenomenon and charging with constant current, so that instant current overshoot in the charging process is avoided, and the service life of a capacitor module is prolonged.
The technical scheme provided by the invention is as follows: an adaptive charging circuit based on a field effect transistor, comprising: the power supply module, the current sampling negative feedback module, the current limiting constant current module and the capacitor module are electrically connected in sequence;
the power supply module is used for providing a charging power supply;
the current sampling negative feedback module is used for carrying out negative feedback adjustment according to the charging current;
the current-limiting constant-current module comprises a current-limiting unit, and the current-limiting unit is used for limiting charging current based on negative feedback regulation of the current sampling negative feedback module so as to realize constant-current charging of the capacitor module.
Further, the current limiting constant current module further comprises a protection unit and an interference suppression unit;
the interference suppression unit is connected with the current limiting unit and suppresses pulse interference at the moment when the current limiting unit is switched on;
the protection unit is connected with the current limiting unit to prevent the instantaneous voltage of the current limiting unit from being too high so as to protect the current limiting unit.
Further, the current sampling negative feedback module includes: a triode Q1, a third resistor R3 and a sixth resistor R6;
the current limiting unit comprises a field effect transistor Q2 and a fourth resistor R4;
the output end of the power supply module is connected with the emitter of the triode Q1 and the first end of the third resistor R3;
the base electrode of the triode Q1 is connected with the first end of the sixth resistor R6;
the collector electrode of the triode Q1 is grounded;
the second end of the sixth resistor R6 is connected with the second end of the third resistor R3 and the source electrode of the field effect transistor Q2;
the grid electrode of the field effect transistor Q2 is connected with the first end of the fourth resistor R4; the second end of the fourth resistor R4 is connected with the collector electrode of the triode Q1;
the drain electrode of the field effect transistor Q2 is connected with the positive electrode of the super module.
Further, the protection unit includes a first zener diode ZD1;
the cathode of the first zener diode ZD1 is connected with the second end of the third resistor R3, the second end of the sixth resistor R6 and the source electrode of the field effect transistor;
the positive electrode of the first zener diode ZD1 is connected to the second end of the fourth resistor R4 and the collector electrode of the triode Q1.
Further, the interference suppression unit comprises a fifth resistor R5 and a second capacitor C2;
the first end of the fifth resistor R5 is connected with the cathode of the first zener diode ZD1, the second end of the third resistor R3, the second end of the sixth resistor R6 and the source electrode of the field effect transistor Q2;
the second end of the fifth resistor R5 is connected with the first end of the second capacitor C2;
the second end of the second capacitor C2 is connected with the drain electrode of the field effect transistor Q2 and the anode of the capacitor module.
Further, the charging circuit further comprises a voltage division module and a slow start module;
the voltage dividing module is connected with the power supply module and divides the output voltage of the power supply module;
the slow start module is connected with the voltage division module to gradually increase the voltage output by the voltage division module.
Further, the voltage division module comprises a first resistor R1 and a second resistor R2;
the slow start module comprises a first capacitor C1;
the first end of the first resistor R1 is connected with the output end of the power supply module, the first end of the first capacitor C1, the emitter of the triode Q1 and the first end of the third resistor R3;
the second end of the first resistor R1, the second end of the first capacitor C1, and the collector of the transistor Q1 are grounded via the second resistor R2.
Further, the charging circuit further comprises an overvoltage protection module arranged between the current-limiting constant-current module and the capacitor and used for preventing the capacitor module from being overvoltage.
Further, the overvoltage protection module comprises a seventh resistor R7;
the first end of the seventh resistor R7 is connected with the second end of the second capacitor C2, the drain electrode of the field effect transistor Q2, the first end of the ninth resistor R9, the first end of the thirteenth resistor R13 and the anode of the capacitor module;
the second end of the ninth resistor R9 is connected with the reference end of the second zener diode ZD2 and the first end of the tenth resistor R10;
the second end of the thirteenth resistor R13 is connected with the cathode of the second zener diode ZD 2;
the second end of the seventh resistor R7, the second end of the tenth resistor R10, the negative electrode of the second zener diode ZD2, and the negative electrode of the capacitor module are grounded.
The invention has the beneficial effects that:
according to the invention, the current sampling negative feedback module is used for carrying out negative feedback adjustment based on the charging current of the capacitor module, the current limiting unit is used for limiting the charging current according to the feedback adjustment of the current sampling negative feedback module, so that the self-adaptive large-current limiting charging phenomenon of the capacitor module is realized, and the capacitor module is charged by using constant current, thereby avoiding instant current overshoot in the charging process of the capacitor module and further being beneficial to prolonging the service life of the capacitor module.
In addition, the embodiment is further provided with a slow starting module, and in the charging process, the self-adaptive circuit is slowly started in a mode of gradually increasing voltage, so that the impact caused by excessively fast starting is prevented, and the service life of each module in the field self-adaptive circuit is influenced.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows an electrical block diagram of one embodiment of a field effect transistor based adaptive circuit provided by the present invention.
Fig. 2 shows a circuit diagram of one embodiment of a field effect transistor based adaptive circuit provided by the present invention.
Fig. 3 shows the output characteristic of a field effect transistor.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In this embodiment, the capacitor module includes at least one capacitor, and the amount of the capacitors can be adjusted according to actual needs, where the larger the number of the capacitors, the larger the required charging current.
As shown in fig. 1, one embodiment of a field effect transistor based adaptive circuit is provided. In this embodiment, the adaptive circuit includes: the device comprises a power supply module, a voltage dividing module, a slow starting module, a current sampling negative feedback module, a current limiting constant current module, an overvoltage protection module and a capacitor module. The output end of the power supply module is sequentially and electrically connected with a voltage dividing module, a slow starting module, a current sampling negative feedback module, a current limiting constant current module, an overvoltage protection module and a capacitor module. The current limiting constant current module comprises a current limiting unit, a protection unit and an interference suppression unit.
The power supply module is used for providing a charging power supply. The voltage dividing module is connected with the output end of the power supply module and divides the output voltage of the power supply module. The slow starting module is connected with the voltage dividing module, when the voltage dividing module applies the voltage after voltage division to the slow starting module, the gradual increase of the charging voltage is realized, so that the slow starting of the self-adaptive charging circuit is realized, the impact caused by excessively quick starting is prevented, and the service life of the self-adaptive circuit is influenced.
The slow start module is connected with the capacitor module through the current sampling negative feedback module, the current limiting constant current module and the overvoltage protection module. The current sampling negative feedback module is used for carrying out negative feedback adjustment based on the charging current of the capacitor module.
The current limiting constant current module comprises a current limiting unit, a protection unit and an interference suppression unit.
The current limiting unit is used for limiting the charging current based on negative feedback adjustment of the current sampling negative feedback module so as to realize constant current charging of the capacitor module.
The interference suppression unit is connected with the current limiting unit and suppresses pulse interference at the moment when the current limiting unit is turned on.
The slow start module is connected with the protection unit, and the protection unit is also connected with the current limiting unit, and the instantaneous voltage of the current limiting unit is prevented from being too high through the protection unit so as to protect the current limiting unit.
The overvoltage protection module is used for preventing the capacitor module from being overvoltage so as to damage the capacitor module and reduce the service life of the capacitor module.
According to the embodiment, the current sampling negative feedback module is used for carrying out negative feedback adjustment based on the charging current of the capacitor module, the current limiting unit is used for limiting the charging current according to the feedback adjustment of the current sampling negative feedback module, so that the current limiting and constant current self-adaptive charging of the capacitor module are realized, instant current overshoot in the charging process of the capacitor module is avoided, and the service life of the capacitor module is prolonged.
In addition, the embodiment is further provided with a slow starting module, and in the charging process, the self-adaptive circuit is slowly started in a mode of gradually increasing voltage, so that the impact caused by excessively fast starting is prevented, and the service life of each module in the field self-adaptive circuit is influenced.
As shown in fig. 2, another embodiment of a field effect transistor based adaptive circuit is provided, in which the capacitive module includes at least one capacitor having a polarity. The present embodiment is exemplified by including two capacitors having polarities, which are respectively denoted as a third capacitor C3 and a fourth capacitor C4.
The self-adaptive circuit comprises a power supply, wherein the output end of the power supply is connected with the first end of the first resistor R1, the first end of the first capacitor C1, the emitter of the triode Q1 and the first end of the third resistor R3.
The base electrode of the triode Q1 is connected with the first end of the sixth resistor R6; the second end of the sixth resistor R6 is connected with the second end of the third resistor R3, the negative electrode of the first zener diode ZD1, the first end of the fifth resistor R5 and the source electrode of the field effect transistor Q2;
the second end of the first resistor R1, the second end of the first capacitor C1, the collector of the triode Q1, the anode of the first zener diode ZD1 and the first end of the fourth resistor R4 are all grounded through the second resistor R4.
The second end of the fourth resistor R4 is connected with the grid electrode of the field effect transistor Q2.
The second terminal of the fifth resistor R5 is connected to the first terminal of the second capacitor C2. The second end of the second capacitor C2 is connected to the drain of the field effect transistor Q2 and the first end of the seventh resistor R7, the first end of the ninth resistor R9, the first end of the thirteenth resistor R13, and the anode of the third capacitor C3.
The second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10 and the reference end of the second zener diode ZD 2.
The second terminal of the thirteenth resistor R13 is connected to the cathode of the second zener diode ZD 2.
The second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, the first end of the fourteenth resistor R14, the first end of the eleventh resistor R11, the second end of the tenth resistor R10, the negative electrode of the second zener diode, the negative electrode of the third capacitor C3, and the positive electrode of the fourth capacitor C4.
The second terminal of the eleventh resistor R11 is connected to the reference terminal of the third zener diode ZD3 and the first terminal of the twelfth resistor R12.
The second terminal of the fourteenth resistor R14 is connected to the cathode of the third zener diode ZD 3.
The second end of the eighth resistor R8, the second end of the twelfth resistor R12, the positive electrode of the third zener diode ZD3, and the negative electrode of the fourth capacitor C4 are grounded.
Note that, if the capacitor module includes only one capacitor, the eighth resistor R8, the eleventh resistor R11, the fourteenth resistor R14, the twelfth resistor R12, the third zener diode ZD3, and the fourth capacitor C4 are removed, and the second end of the tenth resistor R10, the second end of the seventh resistor R7, the positive electrode of the second zener diode ZD2, and the negative electrode of the third capacitor C3 are grounded.
If the capacitor module comprises more capacitors, the capacitors are connected in series, and components in the overvoltage protection module are added according to the mode.
When the power supply device is used, the power supply module supplies power, and the voltage is divided by the first resistor R1 and the second resistor R2, so that the grid electrode and source electrode voltage (Ugs) of the field effect transistor is ensured to be kept at a fixed value. The first resistor R1 and the second resistor R2 are resistors with the same resistance.
The charging circuit composed of the first resistor R1, the second resistor R2 and the first capacitor C1 is powered on immediately, the voltage on the first resistor R1 is not one half of the input voltage (Uin) provided by the power supply module at the moment of power on, namely Uin/2, but gradually decreases to Uin/2 along with the charging of the first capacitor C1, so that the voltage between the grid electrode and the source electrode of the field effect tube Q2 (denoted as Ugs) is slowly increased, the impact caused by excessively quick opening is prevented, the service life of the field effect tube is influenced, the voltage which enables the grid electrode and the source electrode of the field effect tube Q2 to be conducted is denoted as Ugs (th), and when |Ugs| < Ugs (th) |, the field effect tube enters a cut-off region, namely the field effect tube is not conducted.
As the voltage between the gate and the source of fet Q2 (denoted Ugs) slowly increases, the fet begins to turn on as |ugs| > |ugs (th) |. At this time, the charging current of the entire circuit is icharge=uin/(r3+rmos), R3 is the resistance of the third resistor R3, and Rmos is the field-effect transistor on-resistance, where the charging threshold current of the entire circuit is Ith.
If Icharge is smaller than Ith, the transistor Q1 is not turned on, and Icharge is adaptively changed only with the change of the resistances of the third capacitor C3 and the fourth charging container C4, that is, the smaller the resistances of the third capacitor C3 and the fourth charging container C4 are, the larger Icharge is.
When the resistances of the third capacitor C3 and the fourth charging container C4 decrease, in order to make the Icharge exceed Ith, the voltage across the third resistor R3 turns on the emitter junction of the transistor Q1, the transistor Q1 turns on, after the transistor Q1 turns on, the voltage stored on the Ugs capacitor of the fet will discharge through Q1, the Ugs voltage will decrease, as the Ugs voltage decreases, the equivalent resistance between the source and the drain of the fet will increase, the magnitude of the Ugs voltage and the magnitude of the resistance between the source and the drain will be correlated according to the characteristics of the fet, and when the Ugs decreases to a certain value, i.e. the resistance between the source and the drain increases to a certain value, the total impedance of the whole loop remains unchanged, i.e. although the impedance between the third capacitor C3 and the fourth capacitor C4 decreases, the resistance between the source and the drain of the fet increases, thereby limiting the tendency that the Icharge exceeds Ith due to the decrease of the impedance of the third capacitor C3 and the fourth capacitor C4, and the current will not exceed Ith due to the fact that the junction current will not exceed Ith.
At this time, if the resistance of the capacitor module is reduced, the Ugs will be reduced, and the resistance between the source and the drain of the field effect transistor will be increased, so that the resistance between the source and the drain of the field effect transistor is supplemented by the reduced resistance of the capacitor module, so as to ensure that the total resistance is unchanged, and further ensure that the total Icharge does not exceed Ith. In the same way, when the resistance of the capacitor module is increased, the Ugs voltage of the field effect transistor can be increased, the resistance between the source electrode and the drain electrode can be reduced, and the charging current is ensured to be Ith.
In addition, the first zener diode ZD1 suppresses the transient voltage from being excessively high, thereby protecting the field effect transistor gate. The fifth resistor R5 and the second capacitor C2 are connected in series to inhibit impulse interference at the moment of switching the field effect transistor Q2. The seventh resistor R7 and the eighth resistor R8 prevent one of the capacitors from being damaged due to excessively high capacitor voltage when the capacitors are connected in series, the second zener diode ZD2 and the third zener diode ZD3 and the surrounding resistors are overvoltage protection circuits, and when the voltages of the third capacitor C3 and the fourth capacitor C4 are charged to the rated voltage of the capacitor, the second zener diode ZD2 and the third zener diode ZD3 are conducted to clamp the voltage of each capacitor at the rated voltage.
It should be noted that, as shown in fig. 3, the output characteristic curve of the fet may be divided into three regions: cut-off region, constant current region, variable resistance region.
Cut-off zone: when |Ugs| < |Ugs (th) | is satisfied, a field effect transistor (MOSFET) enters a cut-off region.
The off-region is at the lowest part of the output characteristic near the abscissa, and indicates that the field effect transistor (MOSFET) cannot be turned on and is in an off state. The off-region is also called pinch-off region, where the channel is totally pinched off, the drain current Id is 0, and the tube is not operating.
Constant current region: when the requirements of Ugs are not less than Ugs (th) and Usd is not less than Ugs-Ugs (th), a field effect transistor (MOSFET) enters a constant current region.
The constant current region is located in the middle of the output characteristic curve, the drain current Id does not substantially change with |usd|, and the magnitude of the drain current Id is mainly determined by the voltage |ugs|, so that the constant current region, also called a saturation region, is called a constant current region (saturation region) when the MOSFET is used as an amplifying circuit.
Variable resistance region: when |Ugs| > Ugs (th) | is satisfied, and |Usd| < |Ugs-Ugs (th) |, the MOSFET enters the variable resistance region.
The variable resistive region is at the far left of the output characteristic, and the drain current Id rises with increasing Usd, and the drain current Id and the Usd are basically in a linear relation, so that the variable resistive region can be regarded as a linear resistor Rmos, and when Ugs is different, the Rmos resistance of the different resistors is different, so that the MOSFET is equivalent to a variable resistor controlled by the Ugs in the region.
The breakdown region is at the left region of the output characteristic, and as Usd increases, the PN junction is broken down by being subjected to too much reverse voltage, and the pipe should be prevented from operating in this region.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An adaptive charging circuit based on a field effect transistor, comprising: the power supply module, the current sampling negative feedback module, the current limiting constant current module and the capacitor module are electrically connected in sequence;
the power supply module is used for providing a charging power supply;
the current sampling negative feedback module is used for carrying out negative feedback adjustment according to the charging current;
the current-limiting constant-current module comprises a current-limiting unit, and the current-limiting unit is used for limiting charging current based on negative feedback regulation of the current sampling negative feedback module so as to realize constant-current charging of the capacitor module.
2. The adaptive charging circuit based on field effect transistor according to claim 1, wherein the current limiting constant current module further comprises a protection unit and an interference suppression unit;
the interference suppression unit is connected with the current limiting unit and suppresses pulse interference at the moment when the current limiting unit is switched on;
the protection unit is connected with the current limiting unit to prevent the instantaneous voltage of the current limiting unit from being too high so as to protect the current limiting unit.
3. The fet-based adaptive charging circuit of claim 2, wherein the current sampling negative feedback module comprises: a triode Q1, a third resistor R3 and a sixth resistor R6;
the current limiting unit comprises a field effect transistor Q2 and a fourth resistor R4;
the output end of the power supply module is connected with the emitter of the triode Q1 and the first end of the third resistor R3;
the base electrode of the triode Q1 is connected with the first end of the sixth resistor R6;
the collector electrode of the triode Q1 is grounded;
the second end of the sixth resistor R6 is connected with the second end of the third resistor R3 and the source electrode of the field effect transistor Q2;
the grid electrode of the field effect transistor Q2 is connected with the first end of the fourth resistor R4; the second end of the fourth resistor R4 is connected with the collector electrode of the triode Q1;
the drain electrode of the field effect transistor Q2 is connected with the positive electrode of the super module.
4. A field effect transistor based adaptive charging circuit according to claim 3, wherein the protection unit comprises a first zener diode ZD1;
the cathode of the first zener diode ZD1 is connected with the second end of the third resistor R3, the second end of the sixth resistor R6 and the source electrode of the field effect transistor;
the positive electrode of the first zener diode ZD1 is connected to the second end of the fourth resistor R4 and the collector electrode of the triode Q1.
5. The fet-based adaptive charging circuit of claim 4, wherein the disturbance rejection unit comprises a fifth resistor R5 and a second capacitor C2;
the first end of the fifth resistor R5 is connected with the cathode of the first zener diode ZD1, the second end of the third resistor R3, the second end of the sixth resistor R6 and the source electrode of the field effect transistor Q2;
the second end of the fifth resistor R5 is connected with the first end of the second capacitor C2;
the second end of the second capacitor C2 is connected with the drain electrode of the field effect transistor Q2 and the anode of the capacitor module.
6. The adaptive field effect transistor-based charging circuit of claim 5, further comprising a voltage divider module and a soft start module;
the voltage dividing module is connected with the power supply module and divides the output voltage of the power supply module;
the slow start module is connected with the voltage division module to gradually increase the voltage output by the voltage division module.
7. The fet-based adaptive charging circuit of claim 6, wherein the voltage divider module comprises a first resistor R1 and a second resistor R2;
the slow start module comprises a first capacitor C1;
the first end of the first resistor R1 is connected with the output end of the power supply module, the first end of the first capacitor C1, the emitter of the triode Q1 and the first end of the third resistor R3;
the second end of the first resistor R1, the second end of the first capacitor C1, and the collector of the transistor Q1 are grounded via the second resistor R2.
8. The fet-based adaptive charging circuit of claim 7, further comprising an overvoltage protection module disposed between the current limiting constant current module and the capacitor for preventing overvoltage of the capacitor module.
9. The fet-based adaptive charging circuit of claim 8, wherein the overvoltage protection module comprises a seventh resistor R7;
the first end of the seventh resistor R7 is connected with the second end of the second capacitor C2, the drain electrode of the field effect transistor Q2, the first end of the ninth resistor R9, the first end of the thirteenth resistor R13 and the anode of the capacitor module;
the second end of the ninth resistor R9 is connected with the reference end of the second zener diode ZD2 and the first end of the tenth resistor R10;
the second end of the thirteenth resistor R13 is connected with the cathode of the second zener diode ZD 2;
the second end of the seventh resistor R7, the second end of the tenth resistor R10, the negative electrode of the second zener diode ZD2, and the negative electrode of the capacitor module are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310981169.9A CN116722630A (en) | 2023-08-07 | 2023-08-07 | Self-adaptive charging circuit based on field effect transistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310981169.9A CN116722630A (en) | 2023-08-07 | 2023-08-07 | Self-adaptive charging circuit based on field effect transistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116722630A true CN116722630A (en) | 2023-09-08 |
Family
ID=87868287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310981169.9A Pending CN116722630A (en) | 2023-08-07 | 2023-08-07 | Self-adaptive charging circuit based on field effect transistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116722630A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203617899U (en) * | 2013-12-16 | 2014-05-28 | 四川升华电源科技有限公司 | Improved soft start apparatus for rapid discharge and constant-current charge |
| CN109950878A (en) * | 2019-03-19 | 2019-06-28 | 华南理工大学 | One kind is for DC/DC converter self- recoverage protection circuit and over-voltage protection method |
| CN111682506A (en) * | 2020-06-18 | 2020-09-18 | 珠海格力电器股份有限公司 | Reverse-plugging-prevention overvoltage protection circuit, control method and electric appliance |
| CN217693775U (en) * | 2022-06-23 | 2022-10-28 | 湖北美格新能源科技有限公司 | Current-limiting constant current circuit composed of discrete devices |
| CN217721023U (en) * | 2022-04-28 | 2022-11-01 | 深圳创维－Rgb电子有限公司 | DC power supply protection circuit |
-
2023
- 2023-08-07 CN CN202310981169.9A patent/CN116722630A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203617899U (en) * | 2013-12-16 | 2014-05-28 | 四川升华电源科技有限公司 | Improved soft start apparatus for rapid discharge and constant-current charge |
| CN109950878A (en) * | 2019-03-19 | 2019-06-28 | 华南理工大学 | One kind is for DC/DC converter self- recoverage protection circuit and over-voltage protection method |
| CN111682506A (en) * | 2020-06-18 | 2020-09-18 | 珠海格力电器股份有限公司 | Reverse-plugging-prevention overvoltage protection circuit, control method and electric appliance |
| CN217721023U (en) * | 2022-04-28 | 2022-11-01 | 深圳创维－Rgb电子有限公司 | DC power supply protection circuit |
| CN217693775U (en) * | 2022-06-23 | 2022-10-28 | 湖北美格新能源科技有限公司 | Current-limiting constant current circuit composed of discrete devices |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7898114B2 (en) | Protective circuit device for a solar module | |
| CN100382403C (en) | A polarity protection implemented with a MOSFET | |
| US20120098337A1 (en) | Electric power path switching method and electric power path switching circuit | |
| CN104779589A (en) | Battery protection circuit and system | |
| CN203775173U (en) | Time delay switch circuit and dual-power-source selector switch device with same | |
| KR20050005772A (en) | A drive circuit comprising a field effect transistor | |
| CN202650896U (en) | High voltage direct current hybrid circuit breaker with buffer circuit | |
| CN209472413U (en) | A kind of charging circuit and equipment | |
| CN217545586U (en) | Startup surge suppression protection circuit | |
| CN116722630A (en) | Self-adaptive charging circuit based on field effect transistor | |
| CN213879275U (en) | Circuit for limiting impact current | |
| CN210608949U (en) | Voltage transformation rectifying circuit and charger | |
| CN210380681U (en) | Alternating current series connection electricity-taking circuit | |
| CN109462219B (en) | Electrical system surge voltage suppression circuit and surge voltage suppression method thereof | |
| JP3658597B2 (en) | Surge protector | |
| CN219875480U (en) | Time-delay high-voltage protection circuit | |
| CN209767182U (en) | Battery protection circuit | |
| CN211790898U (en) | Charging control circuit and charging control device | |
| CN111049203A (en) | Charge and discharge management circuit and chargeable electronic equipment | |
| CN215120579U (en) | Switching power supply circuit, driving device and power electronic power switch | |
| CN213521289U (en) | Input surge current suppression device | |
| CN116111994B (en) | Capacitive load slow power-on circuit, electronic equipment and control method | |
| CN218958577U (en) | Battery charging circuit | |
| CN213637156U (en) | Direct current power supply and charging circuit thereof | |
| CN213990488U (en) | Circuit of non-isolated single-inductor output positive-negative low-voltage power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |