CN204179688U - The voltage conversion circuit of quick charger - Google Patents
The voltage conversion circuit of quick charger Download PDFInfo
- Publication number
- CN204179688U CN204179688U CN201420423964.2U CN201420423964U CN204179688U CN 204179688 U CN204179688 U CN 204179688U CN 201420423964 U CN201420423964 U CN 201420423964U CN 204179688 U CN204179688 U CN 204179688U
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- China
- Prior art keywords
- voltage conversion
- conversion circuit
- resistance
- terminal
- branch road
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Abstract
The utility model provides a kind of voltage conversion circuit of quick charger, comprise the signal control circuit of process USB feedback signal and accept this signal control circuit feedback, under the effect of two clamp diode and metal-oxide-semiconductor, change the voltage conversion circuit of output voltage, this voltage conversion circuit is first changed at fast charge mode and general mode during external charging.The voltage conversion circuit of quick charger of the present utility model adopts two its cost compare of clamp diode low, and precision comparison is high, and the metal-oxide-semiconductor precision simultaneously adopted is also higher, adds the reaction speed of this voltage conversion circuit; The structure of whole circuit is fairly simple, and principle is simple and cost is low, highly sensitive.
Description
Technical field
The utility model relates to electronic product, particularly relates to a kind of voltage conversion circuit of quick charger.
Background technology
Charger is the appliance and electronic commonly used in life, particularly in mobile charging field.There is a technical problem in this field at present, that is, how to charge to mobile device fast, can be full of by this mobile device in the short period of time.What generally adopt at present be a kind of fast charge method is the fast mold filling formula adopting large current charge when the comparision of quantity of electricity of battery is low, when adopting larger voltage after the ratio that battery electric quantity reaches certain, and the normal charge mode of the saturated charging of small electric stream.Adopt and can fast the electricity of mobile device be full of in this way.
The utility model proposes a kind of basic circuit of quick charge, realize above-mentioned function.
Utility model content
The purpose of this utility model is the voltage conversion circuit providing a kind of quick charger, the mode that the voltage conversion circuit of this quick charger have employed signaling conversion circuit feedback realizes the conversion of charge mode, and concrete comprising controls containing two clamp diodes and controlled N-channel MOS pipe.
The utility model provides a kind of voltage conversion circuit of quick charger for achieving the above object, comprises the voltage input end of first and second terminal, signal control circuit, also comprises the voltage conversion circuit be connected between first and second terminal; Connected by the first electric capacity between first and second terminal described, and be connected to first and the 4th pin of USB interface respectively; Described voltage conversion circuit comprises the first branch road, the second branch road and the 3rd branch road, and described first branch road is connected between first and second terminal and comprises the first resistance connected successively, first pair of clamping diode and the second electric capacity; Described second branch road comprises the second resistance, the 3rd resistance, the 3rd electric capacity and the N-channel MOS pipe that are connected with the first terminal successively; Described 3rd branch road comprises the 4th and the 5th resistor coupled in parallel branch road be connected between the second resistance and the 3rd ohmic connection points and the second terminal; With second pair of clamp diode of the second Capacitance parallel connection.
Described second branch road also comprise be connected in parallel on the 3rd resistance two ends the 6th resistance, with the 8th resistance of the second Capacitance parallel connection, the 7th resistance be connected on metal-oxide-semiconductor grid and the second electric capacity and second pair of clamp diode tie point; Described 3rd electric capacity be connected to metal-oxide-semiconductor grid and drain electrode between, described MOS source electrode is connected with the second terminal.
The clamper end of described second pair of clamp diode is connected to signal control circuit by the 4th electric capacity.
Also inductance is connected with between described the first terminal and USB first pin.
The beneficial effects of the utility model: the voltage conversion circuit of quick charger of the present utility model obtains the basic charge condition of the battery that will charge from 2,3 pins of USB and feeds back to signal control circuit, this signal control circuit is through basic signal transacting, the grid voltage of metal-oxide-semiconductor is changed by second pair of clamp diode, thus change the conducting of this MOS and cut-off thus reach and change this voltage conversion circuit and will export USB1, the charging voltage of 4 pins and the size of electric current to, thus complete quick charge.
This utility model adopts two its cost compare of clamp diode low, and precision comparison is high, and the metal-oxide-semiconductor precision simultaneously adopted is also higher, adds the reaction speed of this voltage conversion circuit; The structure of whole circuit is fairly simple, and principle is simple and cost is low, highly sensitive.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, by describing in detail embodiment of the present utility model, will make the technical solution of the utility model and other beneficial effect apparent.
In accompanying drawing,
Fig. 1 is the voltage conversion circuit schematic diagram of the utility model quick charger.
Drawing reference numeral: S
1, the first terminal; S
2, the second terminal; R
34, the 4th resistance; R
37, the 5th resistance; D
6, second pair of clamp diode; C
17, the 4th electric capacity; R
60, the first resistance; D
8, first pair of clamp diode; C
15, the second electric capacity; R
34, the second resistance; R
9, the 3rd resistance; R
36, the 6th resistance; R
59, the 7th resistance; R
45, the 8th resistance; C
25, the 3rd electric capacity; C
19, the first electric capacity; L
3, inductance, Q
5, N-channel MOS pipe.
Embodiment
For further setting forth the technological means and effect thereof that the utility model takes, be described in detail below in conjunction with preferred embodiment of the present utility model and accompanying drawing thereof.
Consult Fig. 1, the utility model provides a kind of voltage conversion circuit of quick charger, comprises the voltage input end S of first and second terminal
1s
2, signal control circuit, is connected to first and second terminal S
1s
2between voltage conversion circuit; Described first and second terminal S
1s
2between by the first electric capacity C
19connect, and be connected to first and the 4th pin of USB interface respectively; Described voltage conversion circuit comprises the first branch road, the second branch road and the 3rd branch road, and described first branch road is connected to first and second terminal S
1s
2between comprise the first resistance R connected successively
60, first couple of clamping diode D
8and the second electric capacity C
15; Described second branch road comprise successively with the first terminal S
1the the second resistance R connected
34, the 3rd resistance R
9, the 3rd electric capacity C
25and N-channel MOS pipe Q
5; Described 3rd branch road comprises and is connected to the second resistance R
34with the 3rd resistance R
49tie point and the second terminal S
2between the 4th and the 5th resistance R
34r
37parallel branch; With the second electric capacity C
15second couple of clamp diode D in parallel
6.
Described second branch road also comprises and is connected in parallel on the 3rd resistance R
9the 6th resistance R at two ends
36, with the second electric capacity C
158th resistance R in parallel
45, be connected to metal-oxide-semiconductor Q
5grid and the second electric capacity C
15with second couple of clamp diode D
6the 7th resistance R on tie point
59; Described 3rd electric capacity C
25be connected to metal-oxide-semiconductor Q
5grid and drain electrode between, described metal-oxide-semiconductor Q
5source electrode and the second terminal S
2connect.
Described second couple of clamp diode D
6clamper end by the 4th electric capacity C
17be connected to signal control circuit.
Described signal control circuit in fact with the 2nd of USB interface, 3 pins are connected, obtain the fundamental voltage signal on this pin, when the signal on this two pins sends out after external cell lights the triggering signal being about to be full of, this signal control circuit processes this signal, and feed back to voltage conversion circuit, be directly feed back to second couple of clamp diode D
6, thus change metal-oxide-semiconductor Q
5grid voltage, further control the conversion that this voltage conversion unit realizes fast mold filling formula and normal charging mode.
Described the first terminal S
1and be also connected with inductance L between USB first pin
3.
The above; for the person of ordinary skill of the art; can make other various corresponding change and distortion according to the technical solution of the utility model and technical conceive, and all these change and be out of shape the protection range that all should belong to the utility model claim.
Claims (4)
1. a voltage conversion circuit for quick charger, comprises the voltage input end of first and second terminal, signal control circuit, it is characterized in that, also comprises the voltage conversion circuit be connected between first and second terminal; Connected by the first electric capacity between first and second terminal described, and be connected to first and the 4th pin of USB interface respectively; Described voltage conversion circuit comprises the first branch road, the second branch road and the 3rd branch road, and described first branch road is connected between first and second terminal and comprises the first resistance connected successively, first pair of clamping diode and the second electric capacity; Described second branch road comprises the second resistance, the 3rd resistance, the 3rd electric capacity and the N-channel MOS pipe that are connected with the first terminal successively; Described 3rd branch road comprises the 4th and the 5th resistor coupled in parallel branch road be connected between the second resistance and the 3rd ohmic connection points and the second terminal; With second pair of clamp diode of the second Capacitance parallel connection.
2. the voltage conversion circuit of quick charger according to claim 1, is characterized in that: described second branch road also comprise be connected in parallel on the 3rd resistance two ends the 6th resistance, with the 8th resistance of the second Capacitance parallel connection, the 7th resistance be connected on metal-oxide-semiconductor grid and the second electric capacity and second pair of clamp diode tie point; Described 3rd electric capacity be connected to metal-oxide-semiconductor grid and drain electrode between, described MOS source electrode is connected with the second terminal.
3. the voltage conversion circuit of quick charger according to claim 1, is characterized in that: the clamper end of described second pair of clamp diode is connected to signal control circuit by the 4th electric capacity.
4. the voltage conversion circuit of quick charger according to claim 1, is characterized in that: be also connected with inductance between described the first terminal and USB first pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420423964.2U CN204179688U (en) | 2014-07-30 | 2014-07-30 | The voltage conversion circuit of quick charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420423964.2U CN204179688U (en) | 2014-07-30 | 2014-07-30 | The voltage conversion circuit of quick charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204179688U true CN204179688U (en) | 2015-02-25 |
Family
ID=52568463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420423964.2U Active CN204179688U (en) | 2014-07-30 | 2014-07-30 | The voltage conversion circuit of quick charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204179688U (en) |
-
2014
- 2014-07-30 CN CN201420423964.2U patent/CN204179688U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |