CN111711236A - Charging system and charging method of talkback battery pack - Google Patents
Charging system and charging method of talkback battery pack Download PDFInfo
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- CN111711236A CN111711236A CN202010501489.6A CN202010501489A CN111711236A CN 111711236 A CN111711236 A CN 111711236A CN 202010501489 A CN202010501489 A CN 202010501489A CN 111711236 A CN111711236 A CN 111711236A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 24
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
- H02J7/00302—Overcharge 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
- H02J7/00306—Overdischarge 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a charging system and a charging method of an intercom battery pack, and the charging system comprises a charging conversion circuit and an equalizing circuit, wherein the charging conversion circuit is connected between a 5V charger and the intercom battery pack and is used for converting 5V voltage into rated voltage required by the intercom battery pack, the charging conversion circuit comprises a boosting module and a protection module, and the boosting circuit is used for boosting the 5V charging voltage to 8.4V so as to charge the intercom battery pack; the protection module is connected with the boosting module and used for realizing overcharge protection of the battery pack. According to the invention, 5V voltage can be increased to 8.4V voltage through the boosting module, so that an 8.4V special charger is not required to be carried, and the use efficiency of the talkback battery pack is greatly improved; the single battery is detected through the protection module, the problem that the single battery is overcharged or overdischarged is solved, and the service life and the service time of the battery pack are prolonged.
Description
Technical Field
The invention relates to the technical field of electric and electronic technology, in particular to a charging system and a charging method of an intercom battery pack.
Background
At present, in the charging process of a 7.4V talkback battery pack, a special 8.4V charger is generally required to be adopted, so that the talkback battery pack is very inconvenient to carry with the special 8.4V charger in the using process, and the 8.4V voltage is difficult to find in reality, thereby greatly influencing the use of the 7.4V talkback battery pack.
The 5V power supply is available everywhere in reality, so in order to overcome the defects of the prior art, a charging circuit capable of increasing the voltage of 5V to 8.4V is urgently needed.
Disclosure of Invention
The present invention provides a charging system for an intercom battery pack and a charging method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: the charging system comprises a charging conversion circuit, wherein the charging conversion circuit is connected between a 5V charger and an intercom battery pack and is used for converting 5V voltage into rated voltage required by the intercom battery pack, and the charging conversion circuit comprises a boosting module and a protection module.
The boosting module comprises a boosting circuit and a detection circuit, wherein the boosting circuit comprises a boosting chip U2 and is used for boosting a charging voltage of 5V to 8.4V so as to charge the talkback battery pack;
and the pin 1 and the pin GND of the boosting chip U2 are connected with a USB interface and used for boosting the charging voltage of 5V to 8.4V, so that the charging of the talkback battery pack is realized.
The detection circuit is connected with a boosting chip U2 and comprises a MOS tube Q1, the source electrode of the MOS tube Q1 is connected with a 5V power supply, and the grid electrode of the MOS tube Q1 is connected with the boosting chip U2 and used for detecting charging current.
The drain electrode of MOS pipe Q1 connects the positive pole of green lamp LED2, the one end of resistance R14 is connected to the negative pole of green lamp LED2, the one end of resistance R12 and the one end of resistance R13 are connected to the other end of resistance R14, the negative pole of red lamp LED1 is connected to the other end of resistance R13, pin 5 of boost chip U2 is connected to the positive pole of red lamp LED1 to realize that detection circuit detects charging current and shows the current situation simultaneously.
The protection module comprises a protection chip U1, the protection chip U1 is connected with the boosting module and used for detecting the voltage of a single battery in the talkback battery pack, and when the voltage of the single battery reaches a set voltage, the protection chip U1 turns off the circuit to realize the overcharge protection of the battery pack.
The talkback battery pack is formed by connecting two battery cells in series.
The protection chip U1 is connected MOS pipe Q2 and MOS pipe Q3, and when detecting that single voltage reaches the set voltage, protection chip U1 control MOS pipe and turn off to the overcharge protection of realization group battery.
A capacitor C1 is connected in series between the pin 5 and the pin 6 of the protection chip U1, and a capacitor C2 is connected in series between the pin 4 and the pin 6 of the protection chip U1 and used for protecting a circuit.
The battery pack protection circuit is characterized in that one end of a pin 5 connecting resistor R1 of the protection chip U1 is connected, the other end of the resistor R1 is connected with the anode of the battery pack, one end of a pin 4 connecting resistor R2 of the protection chip U1 is connected with the other end of the resistor R5, the cathode of the battery pack is connected with a pin 6 of the protection chip U1, and the voltage of a single battery is detected.
The charging system of the talkback battery pack comprises the charging conversion circuit and the equalization module, wherein the equalization module is connected with the detection circuit, and the equalization module comprises an equalization chip U3 and an equalization chip U4 and is used for controlling charging current and voltage.
And the pins 6 of the equalizing chip U3 and the equalizing chip U4 are respectively connected with the gates of the MOS transistor Q4 and the MOS transistor Q5 and are used for controlling the charging current.
A charging method of a charging system of an intercom battery pack, comprising:
5V voltage is accessed, the boosting module receives the 5V voltage, 8.4V voltage is output and transmitted to the battery pack for charging;
the protection module detects whether the voltage of a single battery of the battery pack is equal to a set voltage, if so, the protection module is turned off, and if not, the battery pack is continuously charged;
the boosting module detects whether the charging current is larger than a set value, if so, the detection circuit is turned off, the red light is on, the green light is off, and if not, the detection circuit is turned on, the red light is off, and the green light is on;
when charging is needed again, the equalizing module detects whether the voltage of a single battery reaches a set value, if so, the charging current is shunted, and if not, no operation is performed.
The invention has the advantages and positive effects that:
(1) according to the invention, the 5V voltage is increased to 8.4V voltage through the boosting module, so that an 8.4V special charger is not required to be carried, and the use efficiency of the talkback battery pack is greatly improved.
(2) According to the invention, through the protection module, the detection of the single battery is realized, and the problem of overcharge or overdischarge of the single battery is prevented, so that the service life of the talkback battery pack is influenced.
(3) According to the invention, the equalizing module is used for detecting the voltage of the single battery by the equalizing chip U3 and the equalizing chip U4 at the same time, so that the charging current of each battery is the same, the single battery is prevented from being overcharged, and the service life and the service time of the battery pack are prolonged.
Drawings
Fig. 1 is a block diagram showing the overall construction of a charging system for an intercom battery pack according to the present invention;
FIG. 2 is a schematic circuit diagram of a boost module of the charge conversion circuit of an intercom battery pack of the present invention;
fig. 3 is a schematic circuit diagram of a protection module of a charge conversion circuit of an intercom battery pack of the present invention;
fig. 4 is a schematic circuit diagram of an equalizing module of a charging system for an intercom battery pack according to the present invention;
fig. 5 is a block flow diagram of a charging method of a charging system of an intercom battery pack of the present invention.
Detailed Description
As shown in fig. 1 to 5, the present invention provides a charging system for an intercom battery pack and a charging method thereof, including that the charging conversion circuit is connected between a 5V charger and the intercom battery pack, and is used for converting a 5V voltage into a rated voltage required by the intercom battery pack, and the charging conversion circuit includes a boost module and a protection module.
The boosting module comprises a boosting circuit and a detection circuit, wherein the boosting circuit comprises a boosting chip U2 and is used for boosting a charging voltage of 5V to 8.4V so as to charge the talkback battery pack;
the talkback battery pack is formed by connecting two battery cells in series.
A pin 1 of the boosting chip U2 is connected with one end of an inductor L1 and one end of a capacitor C6, the other end of the inductor L1 is connected with a pin 3 of the boosting chip U2, one end of a capacitor C5 and a pin 1 of a USB interface J3, a pin 2 of the boosting chip U2 is connected with the other end of a capacitor C6, a pin 4 of the boosting chip U2 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with a pin GND of the boosting chip U2, the other end of a capacitor C5 and a pin 5 of the USB interface J3, a pin 5 of the boosting chip U2 is connected with a detection circuit, a pin 6 of the boosting chip U2 comprises one end of a resistor R9 and one end of a resistor R10, the other end of a resistor R9 is connected with one end of a capacitor C8 and ground, the other end of the resistor R10 is connected with the other end of the capacitor C10, one end of the pin 7 of the boosting chip U10 and a protection module, and a pin 8 of the boosting chip U2 is connected with one end of a capacitor C7, and the other end of the capacitor C7 is grounded and used for boosting the charging voltage of 5V to 8.4V, so that the charging of the talkback battery pack is realized.
The detection circuit comprises a MOS tube Q1, a 5V power supply is connected to the source of the MOS tube Q1, one end of a gate connecting resistor R11 of the MOS tube Q1 and one end of a resistor R12, the anode of a green light LED2 is connected to the drain of the MOS tube Q1, one end of a cathode connecting resistor R14 of the green light LED2, the other end of the resistor R14, the other end of the resistor R12 and one end of the resistor R13 are connected, the cathode of a red light LED1 is connected to the other end of the resistor R13, the anode of the red light LED1 is connected with a pin 5 of a boosting chip U2 and the other end of the resistor R11, and the current condition is displayed when the detection circuit detects the charging current.
The protection module comprises a protection chip U1, the protection chip U1 is connected with the boosting module and used for detecting the voltage of a single battery in the talkback battery pack, and when the voltage of the single battery reaches a set voltage, the protection chip U1 turns off the circuit to realize the overcharge protection of the battery pack.
Protection chip U1 connects MOS pipe Q2 and MOS pipe Q3, MOS pipe Q2 and MOS pipe Q3 are double-circuit MOS pipe, and when detecting that single voltage reaches the settlement voltage, protection chip U1 control MOS pipe cuts off to the overcharge protection to the realization to the group battery.
A pin 5 of the protection chip U1 is connected with one end of a resistor R1 and one end of a capacitor C1, the other end of the resistor R1 is connected with the anode of a battery pack, a pin 4 of the protection chip U1 is connected with one end of a resistor R2 and one end of a capacitor C2, the other end of the resistor R5 is connected with the connecting electrodes of two batteries, a pin 6 of the protection chip U1 is connected with the other end of a capacitor C1, the other end of the capacitor C2, the left source of a MOS transistor Q2, the left source of a MOS transistor Q3 and the cathode of the battery pack, the capacitor C1 and the capacitor C2 are used for a protection circuit and used for detecting the voltage of a single battery, a pin 1 of the protection chip U1 is connected with the left gate of a MOS transistor Q2 and the left gate of a MOS transistor Q3, a pin 2 of the protection chip U1 is connected with the right gate of a transistor Q2 and the right gate of a transistor Q3, and a pin 3 of the protection chip U1 is connected with the source, The right source of MOS pipe Q3, the one end of resistance R3, the other end and the ground connection of electric capacity C9, pin 3 connecting resistance R3's the other end of protection chip U1 for when detecting that single voltage reaches the settlement voltage, protection chip U1 control MOS pipe Q2 and MOS pipe Q3 turn off, in order to realize the overcharge protection to the group battery.
The charging system of the talkback battery pack comprises the charging conversion circuit and the equalization module, wherein the equalization module is connected with the detection circuit, and the equalization module comprises an equalization chip U3 and an equalization chip U4 and is used for controlling charging current and voltage.
A pin 2 of the equalizing chip U3 is connected with one end of a resistor R4 and one end of a capacitor C3, a pin 3 of the equalizing chip U3 is connected with the other end of the capacitor C3, one end of a resistor R5, one end of a resistor R7, a source of a MOS transistor Q4 and connecting electrodes of two battery cells, a pin 6 of the equalizing chip U3 is connected with a grid of a MOS transistor Q4, a drain of the MOS transistor Q4 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with the other end of the resistor R4 and the anode of the battery pack and is used for detecting and controlling the first battery of the battery pack;
a pin 2 of the equalizing chip U4 is connected with the other end of the resistor R5 and one end of the capacitor C4, a pin 3 of the equalizing chip U4 is connected with the other end of the capacitor C4, the source of the MOS tube Q5 and the negative electrode of the battery pack, a pin 6 of the equalizing chip U4 is connected with the grid of the MOS tube Q5, the drain of the MOS tube Q5 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the connecting electrodes of the two battery cells and is used for detecting and controlling the second battery of the battery pack; the equalizing chip U4 is connected with a MOS tube Q4 and a MOS tube Q5 and used for controlling charging current.
A method of charging a charging circuit of an intercom battery pack, comprising:
5V voltage is accessed, the boosting module receives the 5V voltage, 8.4V voltage is output and transmitted to the battery pack for charging;
the protection module detects whether the voltage of a single battery of the battery pack is equal to a set voltage, if so, the protection module is turned off, and if not, the battery pack is continuously charged;
the boosting module detects whether the charging current is larger than a set value, if so, the detection circuit is turned off, the red light is on, the green light is off, and if not, the detection circuit is turned on, the red light is off, and the green light is on;
and if so, the equalizing module detects whether the voltage of the single battery reaches a set value, if so, the charging current is shunted, and if not, no operation is performed.
The working principle and the working process of the invention are as follows:
the USB interface is used for accessing 5V voltage, the voltage boosting chip U2 boosts the 5V voltage to 8.4V voltage, then the battery pack is charged, meanwhile, the protection chip U1 detects the voltage of a single battery of the battery pack, and when the voltage of one battery reaches a set voltage, the protection chip U1 controls the MOS transistor Q1 and the MOS transistor Q2 to be switched off, so that the overcharge protection of the battery pack is realized;
in the charging process, the voltage boosting chip U2 detects the charging current, and when the charging current is greater than a set value, the voltage boosting chip U2 outputs high level, so that an MOS (metal oxide semiconductor) tube Q1 of the detection circuit is closed, the red light LED1 is communicated, and the green light LED2 is turned off; when the charging current is smaller than a set value, the boosting chip U2 outputs a low level to enable the MOS tube Q1 of the detection circuit to be switched on, the red light LED1 is switched off, and the green light LED2 is switched on, so that the current condition is displayed while the charging current is detected;
when the batteries are charged again, the equalizing chip U3 detects the voltage of the first battery, the equalizing chip U4 detects the voltage of the second battery, when the detected voltage reaches a set value, the pin 6 of the equalizing chip U3 and the pin 6 of the equalizing chip U4 output high voltage, the MOS transistor Q3 and the MOS transistor Q4 are controlled to be conducted, the charging current is shunted, the charging current of the battery with higher voltage is reduced, the charging current of the battery with lower voltage is increased, the charging current of each battery is the same, and overcharge of a single battery is prevented.
The invention is characterized in that: the 5V voltage is increased to 8.4V voltage through the boosting module, so that a special 8.4V charger is not required to be carried, and the use efficiency of the talkback battery pack is greatly improved; the detection of the single battery is realized through the protection module, and the problem of overcharge or overdischarge of the single battery is prevented, so that the service life of the talkback battery pack is influenced; the equalizing module is used for detecting the voltage of the single battery by the equalizing chip U3 and the equalizing chip U4, so that the charging current of each battery is the same, the single battery is prevented from being overcharged, and the service life and the service time of the battery pack are prolonged.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. The charging conversion circuit of the talkback battery pack is characterized by being connected between a 5V charger and the talkback battery pack and used for converting 5V voltage into rated voltage required by the talkback battery pack, and the charging conversion circuit comprises a boosting module and a protection module.
2. The charging conversion circuit of an intercom battery pack as in claim 1, wherein the boosting module comprises a boosting circuit and a detection circuit, the boosting circuit comprises a boosting chip U2 for boosting a charging voltage of 5V to 8.4V to charge the intercom battery pack;
and the pin 1 and the pin GND of the boosting chip U2 are connected with a USB interface and used for boosting the charging voltage of 5V to 8.4V, so that the charging of the talkback battery pack is realized.
3. The charging conversion circuit of an intercom battery pack as claimed in claim 2, wherein the detection circuit is connected with a boost chip U2, the detection circuit comprises a MOS tube Q1, the source of the MOS tube Q1 is connected with a 5V power supply, and the gate of the MOS tube Q1 is connected with the boost chip U2 for detecting the charging current.
4. The charging conversion circuit of an intercom battery pack as claimed in claim 3, wherein a drain of the MOS transistor Q1 is connected with an anode of a green light LED2, a cathode of the green light LED2 is connected with one end of a resistor R14, the other end of the resistor R14 is connected with one end of a resistor R12 and one end of a resistor R13, the other end of the resistor R13 is connected with a cathode of a red light LED1, and an anode of the red light LED1 is connected with a pin 5 of a boost chip U2, so that the current condition is displayed while the detection circuit detects the charging current.
5. The charging conversion circuit of an intercom battery pack as claimed in claim 1, wherein the protection module comprises a protection chip U1, the protection chip U1 is connected with the boost module and is used for detecting the voltage of a single battery in the intercom battery pack, and when the voltage of the single battery reaches a set voltage, the protection chip U1 turns off the circuit to realize the overcharge protection of the battery pack.
6. The charging conversion circuit of an intercom battery pack as claimed in claim 5, wherein the protection chip U1 is connected to MOS transistor Q2 and MOS transistor Q3, and when detecting that a single voltage reaches a set voltage, the protection chip U1 controls the MOS transistors to be turned off so as to protect the battery pack from overcharging.
7. A charging system of an intercom battery pack, characterized in that, the charging system comprises the charging conversion circuit of the intercom battery pack as claimed in any one of claims 1 to 6, the charging system further comprises an equalization module, the equalization module is connected with the detection circuit, and the equalization module comprises an equalization chip U3 and an equalization chip U4 for controlling the charging current and voltage.
8. The charging system of an intercom battery pack as claimed in claim 7, wherein pins 6 of said equalizing chip U3 and equalizing chip U4 are respectively connected to the gates of MOS transistor Q4 and MOS transistor Q5 for controlling the charging current.
9. The system for charging an intercom battery pack as claimed in claim 7, wherein said intercom battery pack is formed by two battery cells connected in series.
10. A charging method of a charging system for an intercom battery pack, comprising:
5V voltage is accessed, the boosting module receives the 5V voltage, 8.4V voltage is output and transmitted to the battery pack for charging;
the protection module detects whether the voltage of a single battery of the battery pack is equal to a set voltage, if so, the protection module is turned off, and if not, the battery pack is continuously charged;
the boosting module detects whether the charging current is larger than a set value, if so, the detection circuit is turned off, the red light is on, the green light is off, and if not, the detection circuit is turned on, the red light is off, and the green light is on;
when charging is needed again, the equalizing module detects whether the voltage of a single battery reaches a set value, if so, the charging current is shunted, and if not, no operation is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010501489.6A CN111711236A (en) | 2020-06-03 | 2020-06-03 | Charging system and charging method of talkback battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010501489.6A CN111711236A (en) | 2020-06-03 | 2020-06-03 | Charging system and charging method of talkback battery pack |
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| CN111711236A true CN111711236A (en) | 2020-09-25 |
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| CN202010501489.6A Pending CN111711236A (en) | 2020-06-03 | 2020-06-03 | Charging system and charging method of talkback battery pack |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104578305A (en) * | 2015-01-21 | 2015-04-29 | 深圳市冠旭电子有限公司 | USB intelligent charging circuit and charging device |
| CN204424961U (en) * | 2015-01-29 | 2015-06-24 | 深圳市东泰源电子有限公司 | A kind of efficient USB walkie-talkie group charge protector |
| CN204481549U (en) * | 2015-04-13 | 2015-07-15 | 西安科技大学 | A kind of overcurrent protection charger for mobile phone |
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| CN104993564A (en) * | 2015-07-10 | 2015-10-21 | 常州东村电子有限公司 | New energy super capacitor charging circuit |
| CN205829227U (en) * | 2016-07-08 | 2016-12-21 | 成都信息工程大学 | A kind of lithium rechargeable batteries change-over circuit |
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