CN209016726U - A kind of high-precision voltage-dropping type charging circuit - Google Patents
A kind of high-precision voltage-dropping type charging circuit Download PDFInfo
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- CN209016726U CN209016726U CN201821471832.1U CN201821471832U CN209016726U CN 209016726 U CN209016726 U CN 209016726U CN 201821471832 U CN201821471832 U CN 201821471832U CN 209016726 U CN209016726 U CN 209016726U
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Abstract
The utility model discloses a kind of high-precision voltage-dropping type charging circuits, including input terminal and reduction voltage circuit, the reduction voltage circuit includes main control chip and controllable accurate pressure stabilizing source chip, the main control chip includes the switch pin of two short circuits, Voltage Feedback pin and chip enable pin, the switch pin is successively connect with second resistance and 3rd resistor, the other end of 3rd resistor and the ground terminal of input terminal connect, the Voltage Feedback pin of tie point and main control chip between the second resistance and 3rd resistor connects, second resistance and 3rd resistor are parallel with the 4th resistance and the 5th resistance.High-precision voltage-dropping type charging circuit disclosed by the utility model, higher voltage drop is charged the battery down to close to after cell voltage by reduction voltage circuit module, while this circuit solves the problems, such as that the output voltage deviation due to caused by chip and circuit element difference is big.
Description
Technical field
The utility model relates to appliance circuit, in particular to a kind of high-precision voltage-dropping type charging circuit.
Background technique
Since the voltage of most external power supply is common fixed voltage, it generally cannot directly meet most of productions
The use of product needs, and interiors of products needs to be converted to external voltage required for practical application by boost or depressurization circuit
Voltage, charging circuit are one of more common circuits；But due to the difference of chip and circuit element, conversion circuit it is defeated
Voltage deviation is larger out, is not able to satisfy the needs used sometimes；How the output voltage precision of such circuit is improved, this is just right
Design proposes a great challenge.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of high-precision voltage-dropping type charging circuits, pass through reduction voltage circuit
Module charges the battery higher voltage drop down to close to after cell voltage, at the same this circuit solve due to chip and
The big problem of output voltage deviation caused by circuit element difference.
In order to solve the above-mentioned technical problem, the technical solution of the utility model are as follows:
A kind of high-precision voltage-dropping type charging circuit, including input terminal and reduction voltage circuit, the reduction voltage circuit include master control core
Piece and controllable accurate pressure stabilizing source chip, the main control chip include switch pin, Voltage Feedback pin and the chip of two short circuits
Enable pin, the switch pin are successively connect with second resistance and 3rd resistor, the other end of 3rd resistor and input terminal
Ground terminal connection, the Voltage Feedback pin connection of tie point and main control chip between the second resistance and 3rd resistor, the
Two resistance and 3rd resistor are parallel with the 4th resistance and the 5th resistance, and the 4th resistance is connected with the 5th resistance, the controllable accurate
Pressure stabilizing source chip includes referring to pin, cathode pin and anode pin, and the chip enable pin is parallel with the 8th resistance and the
The other end of one end of nine resistance, the 9th resistance is connect with cathode pin, and the other end of the 8th resistance is connect with anode pin.
Further, the output end of the reduction voltage circuit is parallel with battery charger, and the battery charger includes
The 7th resistance, the 5th diode and the battery unit being sequentially connected in series.
Further, the input terminal includes input interface, first diode, first capacitor and first resistor, described defeated
The anode of incoming interface is in series with first diode, between the cathode end of first diode and the cathode of input interface successively simultaneously
It is associated with first capacitor and first resistor.
Further, the input terminal of the battery charger is parallel with the 6th resistance and the first light emitting diode, and the 6th
Resistance is connected with the first light emitting diode.
By adopting the above technical scheme, external power supply voltage enters the reduction voltage circuit module using main control chip as core,
Middle second resistance and 3rd resistor are feedback divider resistance, adjust the raw output voltage that voltage reduction module is adjusted in this two resistance,
Periphery power supply is given through the 4th diode again；This circuit uses controllable accurate pressure stabilizing source chip, and the 4th resistance and the 5th resistance are
It feeds back divider resistance；When output voltage is higher than setting value, controllable accurate pressure stabilizing source chip starts to act, and controllable accurate is steady
The voltage pull-down of cathode pin on potential source chip in order to make main control chip enable pin foot be completely in low level, therefore increases
Add the 8th resistance and the 9th resistance to form intrinsic standoff ratio, adjusts its value, the enable pin of main control chip can be enabled to be in low level, at this time
Main control chip closing does not work, and then circuit output voltage reduces, i.e., output voltage reduces, when being lower than setting value, main control chip
The voltage for the cathode pin being failure to actuate on controllable accurate pressure stabilizing source chip switchs to high level, main control chip restarting, such shape
At a feedback procedure, output voltage maintains always the voltage value of setting, and the 4th resistance and the 5th resistance use precision resistance,
This circuit output voltage precision can be controlled in 1% or so, realizes that high-precision exports, by reduction voltage circuit module higher voltage
It is reduced to and is charged the battery close to after cell voltage, while this circuit is solved due to caused by chip and circuit element difference
The big problem of output voltage deviation.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing.It should be noted that
The explanation of these embodiments is used to help to understand the utility model, but does not constitute the restriction to the utility model.This
Outside, technical characteristic involved in the various embodiments of the present invention described below is as long as they do not conflict with each other
It can be combined with each other.
As shown in Figure 1, the detailed circuit connection of the utility model, a kind of high-precision voltage-dropping type charging circuit includes input terminal
1 and reduction voltage circuit 2, reduction voltage circuit 2 includes main control chip U1 and controllable accurate source of stable pressure chip IC 1, and main control chip U1 includes two
Switch pin SW, the Voltage Feedback pin FB and chip enable pin EN of a short circuit, switch pin SW successively with second resistance R2
And 3rd resistor R3 connection, the other end of 3rd resistor R3 are connect with the ground terminal of input terminal 1, second resistance R2 and 3rd resistor
Tie point between R3 is connect with the Voltage Feedback pin FB of main control chip U1, and second resistance R2 and 3rd resistor R3 are parallel with
Four resistance R4 and the 5th resistance R5, the 4th resistance R4 connect with the 5th resistance R5, and controllable accurate source of stable pressure chip IC 1 includes reference
Pin R, cathode pin K and anode pin A, chip enable pin EN are parallel with one end of the 8th resistance R8 and the 9th resistance R9,
The other end of 9th resistance R9 is connect with cathode pin K, and the other end of the 8th resistance R8 is connect with anode pin A.External power supply
Voltage enters 2 module of reduction voltage circuit using main control chip U1 as core, and wherein second resistance R2 and 3rd resistor R3 is feedback
Divider resistance adjusts the raw output voltage that voltage reduction module is adjusted in this two resistance, then gives periphery power supply through the 4th diode D4；
This circuit uses controllable accurate source of stable pressure chip IC 1, the 4th resistance R4 and the 5th resistance R5 to feed back divider resistance for it；When defeated
When voltage is higher than setting value out, controllable accurate source of stable pressure chip IC 1 starts to act, will be in controllable accurate source of stable pressure chip IC 1
The voltage pull-down of cathode pin K in order to make main control chip U1 enable pin foot be completely in low level, therefore increases by the 8th resistance
R8 and the 9th resistance R9 forms intrinsic standoff ratio, adjusts its value, the enable pin of main control chip U1 can be enabled to be in low level, at this time master control
Chip U1 closing does not work, and then circuit output voltage reduces, i.e., output voltage reduces, when being lower than setting value, main control chip U1
The voltage for the cathode pin K being failure to actuate in controllable accurate source of stable pressure chip IC 1 switchs to high level, and main control chip U1 restarts,
A feedback procedure is formed in this way, and output voltage maintains always the voltage value of setting, and the 4th resistance R4 and the 5th resistance R5 make
With precision resistance, this circuit output voltage precision can be controlled in 1% or so, realizes that high-precision exports, passes through 2 module of reduction voltage circuit
Higher voltage drop is charged the battery down to close to after cell voltage, while this circuit is solved due to chip and circuit
The big problem of output voltage deviation caused by element difference.
In addition, the output end of reduction voltage circuit 2 is parallel with battery charger 3, battery charger 3 includes being sequentially connected in series
7th resistance R7, the 5th diode D5 and battery unit BAT1,3 DC supply input of circuit charging circuit are stablized, and electricity is effectively extended
The pond portion service life.The input terminal 1 of battery charger 3 is parallel with the 6th resistance R6 and the first Light-emitting diode LED 1, the 6th resistance
R6 connects with the first Light-emitting diode LED 1, and whether mating LED light observation battery unit is fully charged.Input terminal 1 includes input
Interface, first diode D1, first capacitor C1 and first resistor R1, the anode of input interface are in series with first diode D1, the
First capacitor C1 and first resistor R1 is successively parallel between the cathode end of one diode D1 and the cathode of input interface.
The embodiments of the present invention is explained in detail in conjunction with attached drawing above, but the utility model is not limited to be retouched
The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit
These embodiments carry out a variety of change, modification, replacement and modification, still fall in the protection scope of the utility model.
Claims (4)
1. a kind of high-precision voltage-dropping type charging circuit, it is characterised in that: including input terminal and reduction voltage circuit, the reduction voltage circuit packet
Main control chip and controllable accurate pressure stabilizing source chip are included, the main control chip includes the switch pin of two short circuits, Voltage Feedback pipe
Foot and chip enable pin, the switch pin are successively connect with second resistance and 3rd resistor, the other end of 3rd resistor with
The ground terminal of input terminal connects, the Voltage Feedback pin of tie point and main control chip between the second resistance and 3rd resistor
Connection, second resistance and 3rd resistor be parallel with the 4th resistance and the 5th resistance, and the 4th resistance is connected with the 5th resistance, it is described can
Controlling precision voltage regulator chip includes referring to pin, cathode pin and anode pin, and the chip enable pin is parallel with the 8th electricity
One end of resistance and the 9th resistance, the other end of the 9th resistance are connect with cathode pin, the other end and anode pin of the 8th resistance
Connection.
2. high-precision voltage-dropping type charging circuit according to claim 1, it is characterised in that: the output end of the reduction voltage circuit
It is parallel with battery charger, the battery charger includes the 7th resistance, the 5th diode and the battery unit being sequentially connected in series.
3. high-precision voltage-dropping type charging circuit according to claim 1, it is characterised in that: the input terminal includes that input connects
Mouth, first diode, first capacitor and first resistor, the anode of the input interface are in series with first diode, the one or two pole
First capacitor and first resistor are successively parallel between the cathode end of pipe and the cathode of input interface.
4. high-precision voltage-dropping type charging circuit according to claim 2, it is characterised in that: the battery charger it is defeated
Enter end and be parallel with the 6th resistance and the first light emitting diode, the 6th resistance is connected with the first light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821471832.1U CN209016726U (en) | 2018-09-07 | 2018-09-07 | A kind of high-precision voltage-dropping type charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821471832.1U CN209016726U (en) | 2018-09-07 | 2018-09-07 | A kind of high-precision voltage-dropping type charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209016726U true CN209016726U (en) | 2019-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821471832.1U Active CN209016726U (en) | 2018-09-07 | 2018-09-07 | A kind of high-precision voltage-dropping type charging circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209016726U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583797A (en) * | 2022-03-21 | 2022-06-03 | 东莞新能安科技有限公司 | Power supply circuit, battery management system, battery pack and electronic device |
| CN116197591A (en) * | 2023-02-02 | 2023-06-02 | 重庆胜亚管道有限公司 | A lithium battery series portable electric fusion welding machine |
-
2018
- 2018-09-07 CN CN201821471832.1U patent/CN209016726U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583797A (en) * | 2022-03-21 | 2022-06-03 | 东莞新能安科技有限公司 | Power supply circuit, battery management system, battery pack and electronic device |
| CN116197591A (en) * | 2023-02-02 | 2023-06-02 | 重庆胜亚管道有限公司 | A lithium battery series portable electric fusion welding machine |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20230103 Address after: 529000 Room 203, Floor 2, Building 1, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee after: Jiangmen Xiaosong Intelligent Technology Co.,Ltd. Address before: 529085 301, Floor 3, Building 2, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee before: JIANGMEN PENGJIANG DISTRICT JINYING TECHNOLOGY Co.,Ltd. |