CN114665560A - Heavy current charging protection circuit - Google Patents
Heavy current charging protection circuit Download PDFInfo
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- CN114665560A CN114665560A CN202210379918.6A CN202210379918A CN114665560A CN 114665560 A CN114665560 A CN 114665560A CN 202210379918 A CN202210379918 A CN 202210379918A CN 114665560 A CN114665560 A CN 114665560A
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- 238000005070 sampling Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/00304—Overcurrent protection
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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
- H02J7/00308—Overvoltage protection
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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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- 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
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a high-current charging protection circuit, which comprises: the current protection chip, the switch unit and the overcurrent protection unit; the overcurrent protection unit is used for sampling the output current of the switch unit to form an overcurrent sampling signal; the current protection chip is used for comparing the overcurrent sampling signal with a preset threshold value and generating a switch control signal of the switch unit according to a comparison result; the switch unit comprises two switch groups, the two switch groups are connected in series in a current loop between an input power supply and a battery/load, each switch group comprises a main switch tube and an auxiliary switch tube connected in parallel with the main switch tube, and the switch unit is used for controlling the conduction and the disconnection of the main switch tube and the auxiliary switch tube in the switch groups according to a switch control signal output by a current protection chip to form output current to provide electric energy for the battery/load. The invention effectively reduces the switching loss of the charging protection circuit and increases the over-current capability of the charging protection circuit.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a high-current charging protection circuit.
Background
The existing charging port protection circuits mainly have two types, the first type is a protection circuit built by a discrete component, the technical requirement is high, the debugging time is long, and the control logic is complex; the second type is a protection circuit built by an integrated chip, which has complete functions, is simple and easy to use, has low design requirements, short debugging time and low requirements on the technical depth of designers, and greatly shortens the research and development period.
The existing integrated current protection circuit is based on an LTC4364 chip, and integrates functions of overvoltage protection, undervoltage protection, overcurrent protection, power supply transient protection, reverse input protection and the like. Because the grid electrode of the MOS tube used as the switching tube is connected with the capacitor and the resistor, the MOS tube can be turned on completely for a long time from cut-off, which can be more than 100 ms; under the condition of large current, the switching loss is large, the MOS tube is easy to damage, and the current of more than 10A cannot be compatible.
Disclosure of Invention
The invention provides a high-current charging protection circuit, which aims to solve the problems of high switching loss and device damage caused by the use of the conventional charging protection circuit under high current.
The present invention is achieved in such a way that a large-current charging protection circuit includes:
the current protection chip, the switch unit and the overcurrent protection unit;
the overcurrent protection unit is used for sampling the output current of the switch unit to form an overcurrent sampling signal;
the current protection chip is used for comparing the overcurrent sampling signal with a preset threshold value and generating a switch control signal of the switch unit according to a comparison result;
the switch unit comprises two switch groups, the two switch groups are connected in series in a current loop between an input power supply and a battery/load, each switch group comprises a main switch tube and an auxiliary switch tube connected in parallel with the main switch tube, and the switch unit is used for controlling the conduction and the disconnection of the main switch tube and the auxiliary switch tube in the switch groups according to a switch control signal output by a current protection chip to form output current to provide electric energy for the battery/load.
Optionally, a first switch group in the switch unit includes a first main switch tube and a first auxiliary switch tube, and the second switch group includes a second main switch tube and a second auxiliary switch tube;
the drain electrodes of the first main switching tube and the first auxiliary switching tube are connected to an input power supply in common, and the grid electrodes of the first main switching tube and the first auxiliary switching tube are connected to HGATE pins of the current protection chip in common;
the SOURCE electrodes of the first main switching tube and the first auxiliary switching tube and the SOURCE electrodes of the second main switching tube and the second auxiliary switching tube are connected to a SOURCE pin of the current protection chip in a sharing way;
the grid electrodes of the second main switching tube and the second auxiliary switching tube are connected to a DGATE pin of the current protection chip in common, and the drain electrodes of the second main switching tube and the second auxiliary switching tube are connected to a SENSE pin of the current protection chip in common;
the switch unit further comprises a first voltage stabilizing diode and a second voltage stabilizing diode, the anodes of the first voltage stabilizing diode and the second voltage stabilizing diode are connected to the SOURCE pin of the current protection chip, the cathode of the first voltage stabilizing diode is connected to the HGATE pin of the current protection chip, and the cathode of the second voltage stabilizing diode is connected to the DGATE pin of the current protection chip.
Optionally, the overcurrent protection unit includes a sampling resistor.
Optionally, the high-current charging protection circuit further comprises
And the input under-voltage protection unit is used for sampling the charging power supply to form an under-voltage signal of the input current.
Optionally, the input under-voltage protection unit includes a first resistor, a second resistor, and a first capacitor;
the first end of the first resistor is connected with an input power supply;
a common joint point among the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor is connected with the UV pin of the current protection chip;
and the second end of the second resistor and the second end of the first capacitor are connected to the ground in common.
Optionally, the large-current charging protection circuit further includes:
and the input overvoltage protection unit is used for sampling the charging power supply to form an overvoltage signal of the input current.
Optionally, the input overvoltage protection unit includes a third resistor, a fourth resistor, and a second capacitor;
the first end of the third resistor is connected with an input power supply;
a common joint point among the second end of the third resistor, the first end of the fourth resistor and the first end of the second capacitor is connected with an OV pin of the current protection chip;
and the second end of the fourth resistor and the second end of the second capacitor are connected to the ground in common.
Optionally, the large-current charging protection circuit further includes:
and the output overvoltage protection unit is used for sampling the output voltage of the switch unit to form an output voltage signal.
Optionally, the output overvoltage protection unit includes a fifth resistor and a sixth resistor;
the first end of the fifth resistor is connected with an OUT pin of the current protection chip;
the second end of the fifth resistor and the first end of the sixth resistor are connected to the FB pin of the current protection chip in common;
and the second end of the sixth resistor is grounded.
Optionally, the large-current charging protection circuit further includes:
and the software closing unit is used for sampling the output signal of the controller to form a forced closing signal.
Optionally, the software shutdown unit includes a triode switch circuit;
the input end of the triode switch circuit is connected with the controller, and the output end of the triode switch circuit is connected with the SHDN pin of the current protection chip.
The invention removes the grid capacitance of the switch tube by changing the composition of the switch unit in the existing charging protection circuit, adds the switch tube connected in parallel with the switch tube and increases the grid driving current, thereby effectively reducing the time from the opening to the closing and the time from the closing to the opening of the original switch tube, greatly reducing the switching loss of the charging protection circuit, further reducing the temperature rise of the switch tube, increasing the over-current capability of the charging protection circuit, being compatible with larger charging current and further reducing the charging time of the battery.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a high-current charging protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a high-current charging protection circuit according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a high-current charging protection circuit according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention removes the grid capacitance of the switch tube by changing the composition of the switch unit in the existing charging protection circuit, adds the switch tube connected in parallel with the switch tube and increases the grid driving current, thereby effectively reducing the time from the opening to the closing and the time from the closing to the opening of the original switch tube, greatly reducing the switching loss of the charging protection circuit, further reducing the temperature rise of the switch tube, increasing the over-current capability of the charging protection circuit, being compatible with larger charging current and further reducing the charging time of the battery.
Fig. 1 is a schematic diagram of a high-current charging protection circuit according to an embodiment of the present invention. As shown in fig. 1, the large current charging protection circuit includes:
the current protection chip 10, the switch unit 20 and the overcurrent protection unit 30;
the overcurrent protection unit 30 is configured to sample the output current of the switch unit 20 to form an overcurrent sampling signal;
the current protection chip 10 is configured to compare the over-current sampling signal with a preset threshold, and generate a switch control signal of the switch unit 20 according to a comparison result;
the switch unit 20 includes two switch sets 21, the two switch sets 21 are connected in series in a current loop between an input power supply and a battery/load, each switch set 21 includes a main switch tube and an auxiliary switch tube connected in parallel with the main switch tube, and the switch unit 20 is configured to control the on and off of the main switch tube and the auxiliary switch tube in the switch set 21 according to a switch control signal output by the current protection chip 10, so as to form an output current to provide electric energy for the battery/load.
Here, the embodiment of the present invention removes the gate capacitance of the switch tube in the switch unit 20, adds the switch tube connected in parallel with the switch unit, and increases the gate driving current, thereby effectively reducing the time from turn-on to turn-off of the original switch tube to 1.3mS, reducing the time from turn-off to turn-on of the original switch tube to 1.6mS, further greatly reducing the switching loss of the charging protection circuit, reducing the temperature rise of the switch tube, and making the MOS tube as the circuit switch work in the safe working area and ensuring sufficient margin; and the switch tubes are connected in parallel, so that the overcurrent capacity of the charging protection circuit is increased, larger charging current can be compatible, and the charging time of the battery is effectively reduced.
Alternatively, as a preferred example of the present invention, as shown in fig. 2, a schematic diagram of a high-current charging protection circuit provided in an embodiment of the present invention is shown. On the basis of the embodiment of fig. 1, the large-current charging protection circuit further includes:
the input undervoltage protection unit 40 is used for sampling the charging power supply to form an undervoltage signal of input current;
the input overvoltage protection unit 50 is used for sampling the charging power supply to form an overvoltage signal of input current;
and an output overvoltage protection unit 60, configured to sample the output voltage of the switching unit to form an output voltage signal.
A software shutdown unit 70, configured to sample an output signal of the controller to form a forced shutdown signal;
and a fault detection unit 80, configured to capture a charging fault signal output by the current protection chip 10.
The current protection chip 10 is further configured to compare the undervoltage signal, the overvoltage signal, and the output voltage signal of the input current with corresponding preset thresholds, and generate the switch control signal of the switch unit 20 according to the comparison result, or generate the switch control signal of the switch unit 20 according to the forced-off signal, so as to monitor whether charging fails.
The switch unit 20 is further configured to control the on/off of the main switch tube and the auxiliary switch tube in the switch group 21 according to a switch control signal output by the current protection chip 10, so as to protect the battery/load.
The high-current charging protection circuit of the embodiment of the invention can monitor whether charging fails in real time, comprises overcurrent protection, input overvoltage protection, input undervoltage protection and output overvoltage protection, can receive an output signal of the controller through the software closing unit 70 to forcibly close the charging process, and can output a fault signal to the controller through the fault detection unit 80 when a fault occurs.
Alternatively, as a preferred example of the present invention, as shown in fig. 3, a schematic diagram of a high-current charging protection circuit provided in an embodiment of the present invention is shown. As shown in figure 3 of the drawings,
the first switch group in the switch unit 20 comprises a first main switch tube Q11 and a first auxiliary switch tube Q12, and the second switch group comprises a second main switch tube Q21 and a second auxiliary switch tube Q22;
the drains of the first main switch tube Q11 and the first auxiliary switch tube Q12 are connected to an input power VCC-CHARGE in common, and the gates are connected to the HGATE pin of the current protection chip 10 in common;
the SOURCEs of the first main switching tube Q11 and the first auxiliary switching tube Q12, and the SOURCEs of the second main switching tube Q21 and the second auxiliary switching tube Q22 are connected to the SOURCE pin of the current protection chip 10 in common;
the gates of the second main switching tube Q21 and the second sub switching tube Q22 are connected to the DGATE pin of the current protection chip 10, and the drains are connected to the SENSE pin of the current protection chip 10;
the switch unit 20 further includes a first zener diode D1 and a second zener diode D2, anodes of the first zener diode D1 and the second zener diode D2 are connected to the SOURCE pin of the current protection chip 10, a cathode of the first zener diode D1 is connected to the HGATE pin of the current protection chip 10, and a cathode of the second zener diode D2 is connected to the DGATE pin of the current protection chip 10.
The overcurrent protection unit 30 includes a sampling resistor R0.
Here, the current protection chip 10 is preferably an LTC4364 chip. When the charger is connected, the voltage difference exists between the input power VCC-CHARGE of the charger and the battery voltage VCC-VBAT, the voltage of the charger is larger than the battery voltage, the first main switching tube Q11, the first auxiliary switching tube Q12, the second main switching tube Q21 and the second auxiliary switching tube Q22 are conducted, and the electric energy is supplied to the battery or the load. Wherein, the current flow direction is: VCC _ CHARGE → Q11, Q12 → Q21, Q22 → R0 → VCC _ VBAT. The first main switch tube Q11 and the first auxiliary switch tube Q12 are used for controlling the on-off of a current loop. The second main switch tube Q21 and the second auxiliary switch tube Q22 are used to prevent the current from flowing backward from the battery terminal to the charging port, i.e. prevent the current from flowing into the input terminal from the output terminal. The current generates voltage drop when passing through the sampling resistor R0, and an overcurrent point can be set for the high-current charging protection circuit by adjusting the resistance value of R0, so that the overcurrent protection function is realized. The first voltage stabilizing diode D1 and the second voltage stabilizing diode D2 are used for protecting the first main switching tube Q11 and the first auxiliary switching tube Q12, and the second main switching tube Q21 and the second auxiliary switching tube Q22, and ensuring that the gate driving voltage Vgs does not exceed the maximum working voltage.
Optionally, the undervoltage protection unit 40 includes a first resistor R1, a second resistor R2, and a first capacitor C1;
the first end of the first resistor R1 is connected with an input power VCC-CHARGE;
a common joint among the second end of the first resistor R1, the first end of the second resistor R2 and the first end of the first capacitor C1 is connected with a UV pin of the current protection chip 10;
the second end of the second resistor R2 and the second end of the first capacitor C1 are connected to the ground in common.
In the embodiment of the invention, the voltage is divided by the first resistor R1 and the second resistor R2, and filtering is performed by the first capacitor C1, so that an input under-voltage point is set for the large-current charging protection circuit. The current protection chip 10 passes through the UV pin and follows the undervoltage signal that input undervoltage protection unit 40 acquireed input current will undervoltage signal and the corresponding threshold value of predetermineeing compare, work as undervoltage signal is less than or equal to when predetermineeing the threshold value, adjust the output level of HGATE pin is the low level, makes first main switch pipe and first auxiliary switch pipe among the switch unit 20 turn-off to protect battery/load, realize the input undervoltage protection.
Optionally, the input overvoltage protection unit 50 includes a third resistor R3, a fourth resistor R4, and a second capacitor C2;
the first end of the third resistor R3 is connected with an input power VCC-CHARGE;
a common joint point among the second end of the third resistor R3, the first end of the fourth resistor R4 and the first end of the second capacitor C2 is connected with the OV pin of the current protection chip 10;
the second end of the fourth resistor R4 and the second end of the second capacitor C2 are connected to the ground in common.
In this embodiment of the present invention, the voltage is divided by the third resistor R3 and the fourth resistor R4, and filtering is performed by the second capacitor C2, so as to set an input overvoltage point for the large-current charging protection circuit. The current protection chip 10 passes through the OV pin and follows the overvoltage signal that input overvoltage protection unit 50 obtained input current will overvoltage signal and the predetermined threshold value that corresponds carry out the comparison, work as undervoltage signal is greater than or equal to when predetermineeing the threshold value, adjust the output level of HGATE pin is the low level, makes first main switch tube and first auxiliary switch tube among the switch unit 20 turn-offs to protect battery/load, realize input overvoltage protection.
Optionally, the output overvoltage protection unit 60 includes a fifth resistor R5, a sixth resistor R6;
a first end of the fifth resistor R5 is connected to the OUT pin of the current protection chip 10;
the second end of the fifth resistor R5 and the first end of the sixth resistor R6 are connected to the FB pin of the current protection chip 10;
a second terminal of the sixth resistor R6 is connected to ground.
In the embodiment of the invention, the voltage division is performed through the fifth resistor R5 and the sixth resistor R6, so that the output overvoltage point is set for the high-current charging protection circuit. The current protection chip 10 passes through the FB pin and follows output overvoltage protection unit 60 acquires the output voltage signal, will output voltage signal and the corresponding threshold value of predetermineeing carry out the comparison, work as output voltage signal is greater than or equal to when predetermineeing the threshold value, adjust the output level of HGATE pin is the low level, makes first main switch tube and first auxiliary switch tube among the switch unit 20 turn-offs to protect battery/load, realize output overvoltage protection, prevent that charging voltage VCC-VBAT from exceeding battery maximum voltage, cause the battery to damage.
Optionally, the software shutdown unit 70 includes a triode switch circuit 71;
the input end of the triode switch circuit 71 is connected with the controller, and the output end is connected with the SHDN pin of the current protection chip 10.
Optionally, the triode switch circuit 71 is composed of a seventh resistor R7, an eighth resistor R8, and a triode Q3, wherein a base of the triode Q3 is connected to the controller through a seventh resistor R7, a collector of the triode Q3 is connected to a common point between a SHDN pin of the current protection chip 10 and a ninth resistor R9, and the other end of the resistor R9 is connected to an input power VCC-CHARGE. The controller outputs a low level by default, the transistor Q3 is turned off, and the SHDN pin of the current protection chip 10 is at a high level. When forced closing is needed, the controller outputs a high level to enable the triode Q3 to be conducted, so that the SHDN pin of the current protection chip 10 is pulled to a low level, the current protection chip 10 adjusts the output level of the HGATE pin according to the low level of the SHDN pin, and controls the first main switch tube and the first auxiliary switch tube in the switch group 21 to be switched off, so that charging is closed.
For the current protection chip 10, the OUT pin 1 is an output voltage detection input. The pin load detects the drain voltage of an external N-channel MOSFET connected to the DGATE pin. The voltage difference between VCC and OUT sets the fault timer current. When the current difference drops below 0.7V, the ENOUT pin goes to high impedance.
DGATE pin 4, the gate drive output, is used to drive the external MOSFET.
Source pin 5, which is a common source input and gate drive return, is used to control the source-drain voltage on the MOSFET.
And a VCC pin 8 for power supply input of the chip.
SHDN pin 9: and controlling an enabling pin for the chip. The low level turns off the chip operation.
And a UV pin 10 which is an under-voltage comparator input and is used for setting a charging input under-voltage point.
The OV pin 11, which is an overvoltage comparator input, is used to set a charging input overvoltage point.
And a GND pin 12 as a chip power ground.
The FLT pin 13 is a fault output, and outputs a low level when an overvoltage, an overcurrent, or the like occurs.
The ENOUT pin 14, enabling the output, will go high impedance when the voltage on the OUT pin is higher than (VCC-0.7V), indicating that the external MOSFET is fully on. When the voltage of the OUT pin drops below 2.2V, the state of the pin is latched and a reset operation is performed.
TMR pin 15, for fault timer input, is used for setting fault alarm, fault turn-off and cooling cycle time.
In the embodiment of the invention, the grid capacitance of the switch tube in the switch unit 20 is removed, the switch tube connected in parallel with the switch tube is added, and the grid driving current is increased, so that the time from the opening to the closing of the original switch tube is effectively reduced, the time from the closing to the opening of the original switch tube is reduced, the switching loss of the charging protection circuit is further greatly reduced, the switch tube used as a circuit switch works in a safe working area, and enough margin is ensured; and the first main switching tube is connected with the first auxiliary switching tube in parallel, and the second main switching tube is connected with the second auxiliary switching tube in parallel, so that the overcurrent capacity of the charging protection circuit is increased, 0-50A charging current can be compatible, and the charging time of the battery is effectively reduced. Meanwhile, the high-current charging protection circuit provided by the embodiment of the invention can monitor whether charging fails in real time.
It should be understood that the above functional mode is only one embodiment of the present invention, and is not intended to limit the present invention. In other embodiments, the function mode specific control logic may also be set according to actual needs.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (11)
1. A high current charging protection circuit, comprising:
the current protection chip, the switch unit and the overcurrent protection unit;
the overcurrent protection unit is used for sampling the output current of the switch unit to form an overcurrent sampling signal;
the current protection chip is used for comparing the overcurrent sampling signal with a preset threshold value and generating a switch control signal of the switch unit according to a comparison result;
the switch unit comprises two switch groups, the two switch groups are connected in series in a current loop between an input power supply and a battery/load, each switch group comprises a main switch tube and an auxiliary switch tube connected in parallel with the main switch tube, and the switch unit is used for controlling the conduction and the disconnection of the main switch tube and the auxiliary switch tube in the switch groups according to a switch control signal output by a current protection chip to form output current to provide electric energy for the battery/load.
2. The high-current charge protection circuit according to claim 1, wherein the first switch group in the switch unit comprises a first main switch tube and a first auxiliary switch tube, and the second switch group comprises a second main switch tube and a second auxiliary switch tube;
the drain electrodes of the first main switching tube and the first auxiliary switching tube are connected to an input power supply in a sharing mode, and the grid electrodes of the first main switching tube and the first auxiliary switching tube are connected to an HGATE pin of the current protection chip in a sharing mode;
the SOURCE electrodes of the first main switching tube and the first auxiliary switching tube and the SOURCE electrodes of the second main switching tube and the second auxiliary switching tube are connected to a SOURCE pin of the current protection chip in common;
the grid electrodes of the second main switching tube and the second auxiliary switching tube are connected to a DGATE pin of the current protection chip in common, and the drain electrodes of the second main switching tube and the second auxiliary switching tube are connected to a SENSE pin of the current protection chip in common;
the switch unit further comprises a first voltage stabilizing diode and a second voltage stabilizing diode, the anodes of the first voltage stabilizing diode and the second voltage stabilizing diode are connected to the SOURCE pin of the current protection chip, the cathode of the first voltage stabilizing diode is connected to the HGATE pin of the current protection chip, and the cathode of the second voltage stabilizing diode is connected to the DGATE pin of the current protection chip.
3. The large current charge protection circuit of claim 2, wherein said overcurrent protection unit comprises a sampling resistor.
4. The high current charge protection circuit according to any one of claims 1 to 3, wherein said high current charge protection circuit further comprises
And the input under-voltage protection unit is used for sampling the charging power supply to form an under-voltage signal of the input current.
5. The high-current charging protection circuit according to claim 4, wherein the input under-voltage protection unit comprises a first resistor, a second resistor and a first capacitor;
the first end of the first resistor is connected with an input power supply;
a common joint point among the second end of the first resistor, the first end of the second resistor and the first end of the first capacitor is connected with the UV pin of the current protection chip;
and the second end of the second resistor and the second end of the first capacitor are connected to the ground in common.
6. The high current charge protection circuit according to any one of claims 1 to 3, wherein said high current charge protection circuit further comprises:
and the input overvoltage protection unit is used for sampling the charging power supply to form an overvoltage signal of the input current.
7. The high-current charging protection circuit according to claim 6, wherein the input overvoltage protection unit comprises a third resistor, a fourth resistor and a second capacitor;
the first end of the third resistor is connected with an input power supply;
a common joint point among the second end of the third resistor, the first end of the fourth resistor and the first end of the second capacitor is connected with an OV pin of the current protection chip;
and the second end of the fourth resistor and the second end of the second capacitor are connected to the ground in common.
8. The high current charge protection circuit according to any one of claims 1 to 3, wherein said high current charge protection circuit further comprises:
and the output overvoltage protection unit is used for sampling the output voltage of the switch unit to form an output voltage signal.
9. The high current charging protection circuit of claim 8, wherein said output overvoltage protection unit comprises a fifth resistor, a sixth resistor;
the first end of the fifth resistor is connected with an OUT pin of the current protection chip;
the second end of the fifth resistor and the first end of the sixth resistor are connected to the FB pin of the current protection chip in common;
and the second end of the sixth resistor is grounded.
10. The high current charge protection circuit according to any one of claims 1 to 3, wherein said high current charge protection circuit further comprises:
and the software closing unit is used for sampling the output signal of the controller to form a forced closing signal.
11. The high current charge protection circuit of claim 10, wherein said software shutdown unit comprises a triode switch circuit;
the input end of the triode switch circuit is connected with the controller, and the output end of the triode switch circuit is connected with the SHDN pin of the current protection chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210379918.6A CN114665560A (en) | 2022-04-12 | 2022-04-12 | Heavy current charging protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210379918.6A CN114665560A (en) | 2022-04-12 | 2022-04-12 | Heavy current charging protection circuit |
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| CN114665560A true CN114665560A (en) | 2022-06-24 |
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| CN202210379918.6A Pending CN114665560A (en) | 2022-04-12 | 2022-04-12 | Heavy current charging protection circuit |
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| CN116742571A (en) * | 2023-08-16 | 2023-09-12 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
| CN118232480A (en) * | 2024-04-23 | 2024-06-21 | 东莞市百强电源科技有限公司 | Charging protection circuit and lithium battery system |
| WO2024179079A1 (en) * | 2023-02-27 | 2024-09-06 | 广州金升阳科技有限公司 | Protection control circuit and switch power supply |
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