CN203660580U - Usb charging equipment - Google Patents
Usb charging equipment Download PDFInfo
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- CN203660580U CN203660580U CN201320789555.XU CN201320789555U CN203660580U CN 203660580 U CN203660580 U CN 203660580U CN 201320789555 U CN201320789555 U CN 201320789555U CN 203660580 U CN203660580 U CN 203660580U
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- usb charging
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Abstract
The utility model discloses USB charging equipment. The equipment comprises a charging power supply output terminal, a USB charging terminal, a microcontroller and a charging current detection circuit. The charging current detection circuit comprises a current sampling module, a voltage detection module and a detection feedback module. The voltage detection module is used to detect voltages of two ends of the current sampling module. When the USB charging equipment charges external equipment and the voltages of the two ends of the current sampling module are equal, the voltage detection module outputs a detection signal with a low level to the detection feedback module, the detection feedback module carries out feedback to the microcontroller so that the microcontroller makes the USB charging equipment enter into a standby state when continuously detecting a feedback signal with a high level and not detecting any operation of the USB charging equipment, wherein the feedback comprises that the external equipment is fully charged. Energy consumption of the USB charging equipment is saved. If the USB charging equipment charges the external equipment under a cell mode, usage time and a service life of a cell can be prolonged.
Description
Technical field
The utility model relates to technical field of electronic equipment, relates in particular to a kind of USB charging device.
Background technology
Due to popularizing of the consumer electronics products such as PC (PC), sound equipment, video disc player (DVD), and these products are substantially all with USB function, therefore can be using consumer electronics product as charging device, utilize the USB of consumer electronics product to charge to external equipment.In the time that user charges to the external equipment such as mobile phone, MP3 by the USB of the equipment such as PC, sound equipment, DVD, if charging device is just for charging, and do not carry out other feature operations or when action, after the full electricity of outside filling apparatus, charging device is still in mode of operation, will increase so the consumption of charging device to the energy, if charging device is to charge to external equipment, also can reduce service time and the life-span of charging device battery under battery mode.
Utility model content
Main purpose of the present utility model is to propose a kind of USB charging device, the energy resource consumption that is intended to save USB charging device, service time and the life-span of prolongation USB charging device battery.
In order to achieve the above object, the utility model proposes a kind of USB charging device, this USB charging device comprises charge power supply output, USB charging end and microcontroller, also comprises charging current detecting circuit, and described charging current detecting circuit comprises:
For sampling described charge power supply output to the charging current of described USB charging end output and in the current sampling module of two ends generation relevant voltage, for detection of the voltage at described current sampling module two ends and according to the voltage detection module of testing result output detection signal, and for according to described detection signal to described microcontroller feedback charged state, with by the detection feedback module of described microprocessor controls USB charging device operating state; Wherein,
Described current sampling module is connected between described charge power supply output and described USB charging end, two inputs of described voltage detection module are connected to the two ends of described current sampling module, the output of described voltage detection module is connected with the input of described detection feedback module, and the output of described detection feedback module is connected with the charging test side of described microcontroller.
Preferably, described current sampling module comprises the first resistance; One end of described the first resistance is connected with described charge power supply output, and is connected with the first input end of described voltage detection module, and the other end of described the first resistance is connected with described USB charging end, and is connected with the second input of described voltage detection module.
Preferably, described voltage detection module comprises the first operating voltage input and a voltage comparator;
The positive power source terminal of described voltage comparator is connected with described the first operating voltage input, the negative power end ground connection of described voltage comparator, the in-phase input end of described voltage comparator is connected to the common port of described the first resistance and described charge power supply output, the inverting input of described voltage comparator is connected to the common port of described the first resistance and described USB charging end, and the output of described voltage comparator is connected with the input of described detection feedback module.
Preferably, described detection feedback module comprises the second operating voltage input, a switch element, the second resistance, the 3rd resistance, the 4th resistance and feedback output end;
The first end of described switch element is connected with the output of described voltage comparator via described the second resistance, and via described the 3rd grounding through resistance, the second end of described switch element is connected with described feedback output end, and be connected the 3rd end ground connection of described switch element with described the second operating voltage input via described the 4th resistance.
Preferably, described detection feedback module also comprises the 5th resistance; One end of described the 5th resistance is connected with the common port of described the second resistance and the 3rd resistance, and described the 5th other end of resistance and the first end of described switch element are connected.
Preferably, described switch element is triode, the first end that the base stage of described triode is described switch element, the second end of the very described switch element of the current collection of described triode, the 3rd end of the very described switch element of the transmitting of described triode.
Preferably, described triode is NPN triode.
Preferably, described switch element is metal-oxide-semiconductor, the first end that the grid of described metal-oxide-semiconductor is described switch element, the second end that the drain electrode of described metal-oxide-semiconductor is described switch element, the 3rd end that the source electrode of described metal-oxide-semiconductor is described switch element.
Preferably, described metal-oxide-semiconductor is NMOS pipe.
The USB charging device the utility model proposes, charge power supply output produces voltage to the charging current of USB charging end output at current sampling module two ends, voltage detection module detects the voltage at current sampling module two ends, USB charging device to external equipment charging process in, in the time that the voltage at current sampling module two ends equates, the detection signal of voltage detection module output low level is to detecting feedback module, detect feedback module and be full of electricity to microcontroller feedback external equipment, thereby microcontroller continues to detect the feedback signal of high level, and do not detect that when USB charging device has any operation, controlling USB charging device enters holding state, save the energy resource consumption of USB charging device, if USB charging device charges to external equipment under battery mode, can also extend service time and the life-span of battery.
Brief description of the drawings
Fig. 1 is the theory diagram of the utility model USB charging device preferred embodiment;
Fig. 2 is the electrical block diagram of charging current detecting circuit one specific embodiment in Fig. 1;
Fig. 3 is the electrical block diagram of another specific embodiment of charging current detecting circuit in Fig. 1.
The realization of the purpose of this utility model, functional characteristics and advantage, in connection with embodiment, and is described further with reference to accompanying drawing.
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
With reference to Fig. 1, Fig. 1 is the theory diagram of the utility model USB charging device preferred embodiment.
USB charging device of the present utility model is for having USB interface, can be by USB the equipment to the charging of external equipment (not shown), as PC, sound equipment, DVD etc., external equipment can be mobile phone, MP3 etc.
In the utility model preferred embodiment, USB charging device comprises charge power supply output VCC, USB charging end V
uSB, microcontroller 10 and charging current detecting circuit 20, this charging current detecting circuit 20 comprises current sampling module 21, voltage detection module 22 and detects feedback module 23.Current sampling module 21 is for sampling charge power supply output VCC to USB charging end V
uSBthe charging current of output also produces relevant voltage at two ends, voltage detection module 22 is for detection of the voltage at current sampling module 21 two ends and according to testing result output detection signal, detect feedback module 23 for feeding back charged state according to this detection signal to microcontroller 10, to control USB charging device operating state by microcontroller 10.
Wherein, current sampling module 21 is connected in charge power supply output VCC and USB charging end V
uSBbetween, two inputs of voltage detection module 22 are connected to the two ends of current sampling module 21, the output of voltage detection module 22 is connected with the input that detects feedback module 23, detects the output of feedback module 23 and the charging test side of microcontroller 10 and is connected.
In the present embodiment, when external equipment is by USB charging end V
uSBwhen connecting USB charging device and charging, USB charging device charges to external equipment, and USB charging device is giving in external equipment charging process, and the charging current of USB charging device is from charge power supply output VCC output, by USB charging end V
uSBexport external equipment to, charging current flows through the current sampling module 21 in charging current detecting circuit 20.Current sampling module 21 to charge power supply output VCC to USB charging end V
uSBthe charging current of output samples, and produces relevant voltage at the two ends of current sampling module 21, and voltage detection module 22 detects the voltage at current sampling module 21 two ends.
In the time that voltage detection module 22 detects that the voltage at current sampling module 21 two ends exists pressure reduction, voltage detection module 22 is exported the detection signal of high level to detecting feedback module 23, detect feedback module 23 according to the feedback signal of the detection signal output low level of this high level to microcontroller 10, feed back now USB charging device to microcontroller 10 and charge to external equipment, microcontroller 10 confirms that USB charging device is in charged state after low level feedback signal being detected.
In the time that voltage detection module 22 detects that the voltage at current sampling module 21 two ends equates, the detection signal of voltage detection module 22 output low levels is to detecting feedback module 23, the feedback signal that detection feedback module 23 is exported high level according to this low level detection signal is to microcontroller 10, feed back now external equipment to microcontroller 10 and be full of electricity, USB charging device no longer charges to external equipment, thereby microcontroller 10 continues to detect the feedback signal of high level, and do not detect when USB charging device has any operation, microcontroller 10 confirms that USB charging device is in idle condition, and control USB charging device and enter holding state.
With respect to prior art, USB charging device of the present utility model, detect the voltage at current sampling module 21 two ends by voltage detection module 22, USB charging device to external equipment charging process in, in the time that the voltage at current sampling module 21 two ends equates, the detection signal of voltage detection module 22 output low levels is to detecting feedback module 23, detection feedback module 23 feeds back external equipment to microcontroller 10 and has been full of electricity, thereby microcontroller 10 continues to detect the feedback signal of high level, and do not detect that when USB charging device has any operation, controlling USB charging device enters holding state, save the energy resource consumption of USB charging device, if USB charging device charges to external equipment under battery mode, can also extend service time and the life-span of battery.
Refer again to Fig. 2, Fig. 2 is the electrical block diagram of charging current detecting circuit one specific embodiment in Fig. 1.
In the present embodiment, current sampling module 21 comprises the first resistance R 1; One end of the first resistance R 1 is connected with charge power supply output VCC, and is connected with the first input end of voltage detection module 22, the other end of the first resistance R 1 and USB charging end V
uSBconnect, and be connected with the second input of voltage detection module 22.
The positive power source terminal of voltage comparator U1 is connected with the first operating voltage input VDD, the negative power end ground connection of voltage comparator U1, the in-phase input end of voltage comparator U1 is connected to the common port of the first resistance R 1 and charge power supply output VCC, and the inverting input of voltage comparator U1 is connected to the first resistance R 1 and USB charging end V
uSBcommon port, the output of voltage comparator U1 with detect the input of feedback module 23 and be connected.
Detect feedback module 23 and comprise the second operating voltage input VEE, switch element Q1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and feedback output end V
fB.
The first end of switch element Q1 is connected with the output of voltage comparator U1 via the second resistance R 2, and via the 3rd resistance R 3 ground connection, the second end of switch element Q1 and feedback output end V
fBconnect, and be connected the 3rd end ground connection of switch element Q1 via the 4th resistance R 4 with the second operating voltage input VEE.
Particularly, detect feedback module 23 and also comprise the 5th resistance R 5; One end of the 5th resistance R 5 is connected with the common port of the second resistance R 2 and the 3rd resistance R 3, and the other end of the 5th resistance R 5 is connected with the first end of switch element Q1.
As shown in Figure 2, switch element Q1 is triode, and wherein, this triode is NPN triode.The base stage of triode is the first end of switch element Q1, and the current collection of triode is the second end of switch element Q1 very, and the transmitting of triode is the 3rd end of switch element Q1 very.
In the embodiment of a distortion, refer again to Fig. 3, Fig. 3 is the electrical block diagram of another specific embodiment of charging current detecting circuit in Fig. 1.
Different from charging current detecting circuit shown in Fig. 2, in Fig. 3, switch element Q1 is metal-oxide-semiconductor, and wherein, this metal-oxide-semiconductor is NMOS pipe.The grid of metal-oxide-semiconductor is the first end of switch element Q1, and the drain electrode of metal-oxide-semiconductor is the second end of switch element Q1, and the source electrode of metal-oxide-semiconductor is the 3rd end of switch element Q1.
The operation principle of the utility model USB charging device specifically describes as follows:
When external equipment does not connect USB charging device, be that USB charging device is not while charging to external equipment, the voltage V1 at the first resistance R 1 two ends, V2 equates, the voltage on in-phase input end and the inverting input of voltage comparator U1 equates, the detection signal of the output output low level of voltage comparator U1, thereby the first end of switch element Q1 is low level, switch element Q1 turn-offs, now owing to drawing effect in the 4th resistance R 4, export the 3rd end of switch element Q1 to via the 4th resistance R 4 from the voltage of the second operating voltage input VEE input, thereby by feedback output end V
fBthe feedback signal that exports microcontroller 10 to is high level, represents that now USB charging device does not charge to external equipment.Therefore, if the feedback signal that microcontroller 10 detects is high level, and microcontroller 10 do not detect that USB charging device has any operation in Preset Time (as 30 seconds), microcontroller 10 is according to himself Opportunity awaiting control for linear function control USB charging device standby.
In the time that external equipment charges by USB feeder ear connection USB charging device, USB charging device charges to external equipment, USB charging device is giving in external equipment charging process, and the charging current of USB charging device is from charge power supply output VCC output, by USB charging end V
uSBexport external equipment to, charge power supply output VCC is to USB charging end V
uSBthe charging current of output flows through the first resistance R 1, thereby produce voltage at the first resistance R 1 two ends, voltage V1, the V2 at the first resistance R 1 two ends exports respectively in-phase input end and the inverting input of voltage comparator U1 to, voltage comparator U1 detects the voltage at the first resistance R 1 two ends, relatively the size of V1, V2.
If voltage comparator U1 detects V1 > V2, the voltage of the output of voltage comparator U1 output equals the voltage of the first operating voltage input VDD input, as 12V.Therefore the detection signal of the now output of voltage comparator U1 output is high level, 12V detection signal exports the first end of switch element Q1 to after the second resistance R 2 and the 3rd resistance R 3 dividing potential drops, thereby the first end of switch element Q1 is high level, switch element Q1 conducting, now the 3rd end of switch element Q1 is dragged down, therefore by feedback output end V
fBthe feedback signal that exports microcontroller 10 to is low level, represents that now USB charging device is to external equipment charging, and microcontroller 10 confirms that USB charging device is in charged state after low level feedback signal being detected.
If voltage comparator U1 detects V1=V2, the voltage of the output of voltage comparator U1 is 0V, therefore the detection signal of the now output of voltage comparator U1 output is low level, thereby the first end of switch element Q1 is low level, switch element Q1 turn-offs, now, owing to drawing effect in the 4th resistance R 4, export the 3rd end of switch element Q1 to via the 4th resistance R 4 from the voltage of the second operating voltage input VEE input, thereby by feedback output end V
fBthe feedback signal that exports microcontroller 10 to is high level, represents that now external equipment has been full of electricity, and USB charging device no longer charges to external equipment.So, in the time that microcontroller 10 continues to detect the feedback signal of high level, microcontroller 10 confirms that USB charging device no longer charges to external equipment, then microcontroller 10 detects USB charging device, when in Preset Time, microcontroller 10 does not detect when USB charging device has any operation, microcontroller 10 confirms that USB charging device is in idle condition, and control USB charging device and enter holding state, make the standby in the time not charging and operate without any other to external equipment of USB charging device, reduce the consumption to the energy.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (9)
1. a USB charging device, comprises charge power supply output, USB charging end and microcontroller, it is characterized in that, also comprises charging current detecting circuit, and described charging current detecting circuit comprises:
For sampling described charge power supply output to the charging current of described USB charging end output and in the current sampling module of two ends generation relevant voltage, for detection of the voltage at described current sampling module two ends and according to the voltage detection module of testing result output detection signal, and for according to described detection signal to described microcontroller feedback charged state, with by the detection feedback module of described microprocessor controls USB charging device operating state; Wherein,
Described current sampling module is connected between described charge power supply output and described USB charging end, two inputs of described voltage detection module are connected to the two ends of described current sampling module, the output of described voltage detection module is connected with the input of described detection feedback module, and the output of described detection feedback module is connected with the charging test side of described microcontroller.
2. USB charging device as claimed in claim 1, is characterized in that, described current sampling module comprises the first resistance;
One end of described the first resistance is connected with described charge power supply output, and is connected with the first input end of described voltage detection module, and the other end of described the first resistance is connected with described USB charging end, and is connected with the second input of described voltage detection module.
3. USB charging device as claimed in claim 2, is characterized in that, described voltage detection module comprises the first operating voltage input and a voltage comparator;
The positive power source terminal of described voltage comparator is connected with described the first operating voltage input, the negative power end ground connection of described voltage comparator, the in-phase input end of described voltage comparator is connected to the common port of described the first resistance and described charge power supply output, the inverting input of described voltage comparator is connected to the common port of described the first resistance and described USB charging end, and the output of described voltage comparator is connected with the input of described detection feedback module.
4. USB charging device as claimed in claim 3, is characterized in that, described detection feedback module comprises the second operating voltage input, a switch element, the second resistance, the 3rd resistance, the 4th resistance and feedback output end;
The first end of described switch element is connected with the output of described voltage comparator via described the second resistance, and via described the 3rd grounding through resistance, the second end of described switch element is connected with described feedback output end, and be connected the 3rd end ground connection of described switch element with described the second operating voltage input via described the 4th resistance.
5. USB charging device as claimed in claim 4, is characterized in that, described detection feedback module also comprises the 5th resistance;
One end of described the 5th resistance is connected with the common port of described the second resistance and the 3rd resistance, and described the 5th other end of resistance and the first end of described switch element are connected.
6. the USB charging device as described in claim 4 or 5, it is characterized in that, described switch element is triode, the base stage of described triode is the first end of described switch element, the second end of the very described switch element of the current collection of described triode, the 3rd end of the very described switch element of the transmitting of described triode.
7. USB charging device as claimed in claim 6, is characterized in that, described triode is NPN triode.
8. the USB charging device as described in claim 4 or 5, it is characterized in that, described switch element is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is the first end of described switch element, the drain electrode of described metal-oxide-semiconductor is the second end of described switch element, the 3rd end that the source electrode of described metal-oxide-semiconductor is described switch element.
9. USB charging device as claimed in claim 8, is characterized in that, described metal-oxide-semiconductor is NMOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320789555.XU CN203660580U (en) | 2013-12-03 | 2013-12-03 | Usb charging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320789555.XU CN203660580U (en) | 2013-12-03 | 2013-12-03 | Usb charging equipment |
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| Publication Number | Publication Date |
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| CN203660580U true CN203660580U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320789555.XU Expired - Fee Related CN203660580U (en) | 2013-12-03 | 2013-12-03 | Usb charging equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394860A (en) * | 2017-09-06 | 2017-11-24 | 芯海科技（深圳）股份有限公司 | A kind of charging bluetooth earphone low current detection method |
| CN114142577A (en) * | 2022-01-29 | 2022-03-04 | 深圳市创芯微微电子有限公司 | Battery protection circuit, system and method for battery standby control |
-
2013
- 2013-12-03 CN CN201320789555.XU patent/CN203660580U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394860A (en) * | 2017-09-06 | 2017-11-24 | 芯海科技（深圳）股份有限公司 | A kind of charging bluetooth earphone low current detection method |
| CN107394860B (en) * | 2017-09-06 | 2020-07-14 | 芯海科技（深圳）股份有限公司 | Charging small current detection method for Bluetooth headset |
| CN114142577A (en) * | 2022-01-29 | 2022-03-04 | 深圳市创芯微微电子有限公司 | Battery protection circuit, system and method for battery standby control |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20201203 |
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| CF01 | Termination of patent right due to non-payment of annual fee |