CN204167961U - USB automobile charger automatic shutdown circuitry - Google Patents
USB automobile charger automatic shutdown circuitry Download PDFInfo
- Publication number
- CN204167961U CN204167961U CN201420662904.6U CN201420662904U CN204167961U CN 204167961 U CN204167961 U CN 204167961U CN 201420662904 U CN201420662904 U CN 201420662904U CN 204167961 U CN204167961 U CN 204167961U
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- circuit
- automatic shutdown
- coupled
- shutdown circuitry
- detection signal
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Abstract
The utility model discloses a kind of USB automobile charger automatic shutdown circuitry, solve the problem that USB automobile charger cannot close vehicle-mounted charge circuit after to electrical equipment charging completes such as mobile phones automatically, its drip irrigation device comprises vehicle-mounted charge circuit, also comprise the automatic shutdown circuitry be coupled between vehicle-mounted charge circuit and load, described automatic shutdown circuitry comprises charging voltage and detects comparison circuit: be coupled to receive charging voltage between vehicle-mounted charge circuit and load, and output detection signal; Control circuit: be coupled to charging voltage and detect comparison circuit to receive detection signal, after being full of electricity with control apparatus, vehicle-mounted charging circuit can realize cutting out, USB automobile charger automatic shutdown circuitry of the present utility model, pass through be provided with automatic shutdown circuitry, making after the electrical equipment charging completes such as mobile phone can auto-breaking, avoids driver need manual power-off when driving and cause danger.
Description
Technical field
The utility model relates to a kind of breaking circuit, and more particularly, it relates to a kind of USB automobile charger automatic shutdown circuitry.
Background technology
USB automobile charger: usually fill also referred to as USB car, the versatility which utilizes USB is extensively applied to the advantage of the interface of various charging, connected applications is on automobile again, 12V DC in car and 24V DC is changed into the common DC 5V voltage of USB and each charging electrical equipment, material is thus formed and the reference power supply on automobile and USB interface can be utilized to charge to the electrical equipment of DC 5V.
Use USB automobile charger when to electrical equipment chargings such as mobile phones, when mobile phone complete charging after but mobile phone and USB automobile charger are not departed from, mobile phone is made still to be in charged state, greatly can reduce the useful life of battery of mobile phone in this process, in order to improve the useful life of battery of mobile phone, the mobile phone of charging complete can be come off from USB automobile charger, and the driver driven is completed to this process and may there is certain danger, so a design USB automobile charger that can automatically shut down is necessary.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide a kind of USB automobile charger automatically can closing vehicle-mounted charge circuit after to electrical equipment charging completes such as mobile phones.
For achieving the above object, the utility model provides following technical scheme: a kind of USB automobile charger automatic shutdown circuitry, comprise vehicle-mounted charge circuit, also comprise the automatic shutdown circuitry be coupled between vehicle-mounted charge circuit and load, described automatic shutdown circuitry comprises
Charging voltage detects comparison circuit: be coupled to receive charging voltage between vehicle-mounted charge circuit and load, and output detection signal;
Control circuit: be coupled to charging voltage and detect comparison circuit to receive detection signal, after being full of electricity with control apparatus, vehicle-mounted charging circuit can realize cutting out.
By adopting technique scheme, make charging voltage detect comparison circuit and can receive charging voltage between vehicle-mounted charge circuit and load, and then compare and output detection signal, control circuit is after receiving detection signal simultaneously, vehicle-mounted charge circuit is controlled, realize it and close the function opened, and then avoid the danger that driver needs changable to cause from USB automobile charger and electrical equipment in driving procedure, greatly improve the fail safe of driving, simultaneously can better protective device battery, improve its useful life, prevent from being in charged state always and electrical equipment battery being reduced.
The utility model is set to further: described automatic shutdown circuitry also comprises
Warning circuit: be coupled to charging voltage and detect comparison circuit, open and close in response to detection signal.
By adopting technique scheme, making it possible to be pointed out user by warning circuit after receiving detection signal, being convenient to the charge condition of informing user, making function hommization more.
The utility model is set to further: described charging voltage detects comparison circuit and comprises upper voltage limit comparator;
In-phase end on described upper voltage limit comparator is to receive charging voltage, and the end of oppisite phase on described upper voltage limit comparator is connected with default upper limit reference voltage, the output output detection signal of described upper voltage limit comparator.
By adopting technique scheme, make the upper limit reference voltage in upper voltage limit comparator compare size with charging voltage, thus generation high level or low level signal are exported, realize the function compared.
The utility model is set to further: described control circuit comprises switch element, latching relay and reset circuit;
The input stage of described switch element is coupled to upper voltage limit comparing unit to receive detection signal, and the output stage of described switch element is coupled to the actuating coil of latching relay, is in closed condition with the normally opened contact controlling latching relay;
Described reset circuit comprises normally closed switch, and described normally closed switch is coupled to the hold-in winding of latching relay, to control the break-make of the hold-in winding of latching relay.
By adopting technique scheme, what can control latching relay after making switch element receive detection signal is in normally opened contact place, and then vehicle-mounted charge circuit and load are no longer connected, realize the function of auto-breaking, simultaneously because the normally closed switch in reset circuit is coupled to hold-in winding, make hold-in winding in running order all the time, and then latching relay is in normally opened contact place all the time, and normally closed switch is opened, make hold-in winding no longer in running order, and then make latching relay be in normally-closed contact place, vehicle-mounted charge circuit and load are connected again, and then again can realize the function of charging, and simple operation for the user, only need to open the function that normally closed switch can realize again charging, without the need to electrical equipment is pulled out from USB automobile charger, improve the fail safe that driver drives.
The utility model is set to further: described warning circuit comprises buzzer and triode;
The base stage of described triode is coupled to upper voltage limit comparing unit to receive detection signal, and the collector electrode of described triode is coupled to buzzer, to control the keying of buzzer.
By adopting technique scheme, making to be reminded driver by buzzer when charging is complete, making function more hommization, be convenient to driver and understand charge condition.
The utility model has following advantage: pass through be provided with automatic shutdown circuitry; making after the electrical equipment charging completes such as mobile phone can auto-breaking; driver is avoided to need manual power-off when driving and cause danger; the electrical equipment such as mobile phone can be made again to charge by disconnecting normally closed switch simultaneously; without the need in order to protect the battery of mobile phone to plug mobile phone; operation is more simple, and for safer driver.
Accompanying drawing explanation
Fig. 1 is the system block diagram of automatic shutdown circuitry embodiment of the present utility model;
Fig. 2 is the automatic shutdown circuitry of automatic shutdown circuitry embodiment of the present utility model.
In figure: 1, charging voltage detects comparison circuit; 2, control circuit; 3, warning circuit; 4, reset circuit.
Embodiment
Shown in Fig. 2, embodiment is described further.
A kind of USB automobile charger automatic shutdown circuitry disclosed in the utility model, comprise vehicle-mounted charge circuit, also comprise the automatic shutdown circuitry be coupled between vehicle-mounted charge circuit and load, described automatic shutdown circuitry comprises charging voltage and detects comparison circuit 1, control circuit 2;
Charging voltage detects comparison circuit 1: be coupled to receive charging voltage between vehicle-mounted charge circuit and load, and output detection signal, described charging voltage detects comparison circuit 1 and comprises upper voltage limit comparator, described upper voltage limit comparator is preferably LM393A, in-phase end on described upper voltage limit comparator is to receive charging voltage Vp1, end of oppisite phase on described upper voltage limit comparator is connected with default upper limit reference voltage V ref, mutually compared with upper limit reference voltage V ref by charging voltage Vp1, when charging voltage Vp1 is greater than upper limit reference voltage V ref, the detection signal that then output of upper voltage limit comparator exports is high level, when charging voltage Vp1 is less than upper limit reference voltage V ref, the detection signal that then output of upper voltage limit comparator exports is low level.
Control circuit 2: be coupled to charging voltage and detect comparison circuit 1 to receive detection signal, after being full of electricity with control apparatus, vehicle-mounted charging circuit can realize cutting out, described control circuit 2 comprises switch element, latching relay KM and reset circuit 4, the input stage of described switch element is coupled to upper voltage limit comparing unit to receive detection signal, and the output stage of described switch element is coupled to the actuating coil of latching relay KM, is in closed condition with the normally opened contact controlling latching relay KM, described switch element is preferably NMOS tube, the grid G of NMOS tube is coupled to upper voltage limit comparator to receive detection signal P1, drain D is connected with resistance R2, to protect the metal-oxide-semiconductor of N raceway groove, source class S is connected with one end of resistance R3, the setting of resistance R3 is to protect latching relay KM, the other end of resistance R3 is connected with actuating coil, make actuating coil can control its break-make by NMOS tube, latching relay KM can normally be used, latching relay KM detects between comparison circuit 1 and load in charging voltage, whole automatic shutdown circuitry is convenient to close.
Described reset circuit 4 comprises normally closed switch K1, and described normally closed switch K1 is coupled to the hold-in winding of latching relay KM, to control the break-make of the hold-in winding of latching relay KM; Described normally closed switch K1 one end is connected with power supply, and the other end is connected with the hold-in winding of latching relay KM, to ensure that the self-retaining function of latching relay KM can realize.
After switch element receives the detection signal into high level, make switching elements conductive, and then the actuating coil of latching relay KM is switched on, latching relay KM is in normally opened contact place, and then vehicle-mounted charge circuit and load are no longer connected, realize the function of auto-breaking, simultaneously because the normally closed switch in reset circuit 4 is coupled to hold-in winding, make hold-in winding in running order all the time, and then latching relay KM is in normally opened contact place all the time, when the electrical equipment such as mobile phone not being pulled out from USB automobile charger, using the electricity of the batteries of electrical equipment such as mobile phone own, charging voltage detects comparison circuit 1 and is in off-state, there will not be the situation again detecting charging voltage, the situation being always in charging is avoided to occur, by normally closed switch is opened, make hold-in winding no longer in running order, and then make latching relay KM be in normally-closed contact place, vehicle-mounted charge circuit and load are connected again, and then again can realize the function of charging, and simple operation for the user, only need to open the function that normally closed switch can realize again charging, without the need to electrical equipment is pulled out from USB automobile charger, improve the fail safe that driver drives.
Described automatic shutdown circuitry also comprises warning circuit 3, warning circuit 3: be coupled to charging voltage and detect comparison circuit 1 to receive detection signal, to control the keying of warning circuit 3, described warning circuit 3 comprises buzzer HA and triode, the base stage of described triode is coupled to the output of upper voltage limit comparing unit to receive detection signal, and be connected with protective resistance R4 between the output of the base stage of triode and upper voltage limit comparing unit, the collector electrode of described triode is coupled to one end of buzzer HA, the other end of buzzer HA is connected with power supply, buzzer HA can normally be used, triode is preferably NPN, the grounded emitter of triode, during the detection signal of the high level that the base stage when triode is accepted, make triode ON, and then make buzzer HA send sound prompting charge condition, simultaneously due to the effect of latching relay KM, turn off between vehicle-mounted charge circuit and load completely, and charging voltage detection comparison circuit 1 is also turned off, make charging voltage detect comparison circuit 1 cannot normally work, and then make triode not receive the detection signal of high level, buzzer HA is made to stop sound.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (5)
1. a USB automobile charger automatic shutdown circuitry, comprises vehicle-mounted charge circuit, it is characterized in that: also comprise the automatic shutdown circuitry be coupled between vehicle-mounted charge circuit and load, and described automatic shutdown circuitry comprises
Charging voltage detects comparison circuit: be coupled to receive charging voltage between vehicle-mounted charge circuit and load, and output detection signal;
Control circuit: be coupled to charging voltage and detect comparison circuit to receive detection signal, after being full of electricity with control apparatus, vehicle-mounted charging circuit can realize cutting out.
2. USB automobile charger automatic shutdown circuitry according to claim 1, is characterized in that: described automatic shutdown circuitry also comprises
Warning circuit: be coupled to charging voltage and detect comparison circuit, open and close in response to detection signal.
3. USB automobile charger automatic shutdown circuitry according to claim 1 and 2, is characterized in that: described charging voltage detects comparison circuit and comprises upper voltage limit comparator;
In-phase end on described upper voltage limit comparator is to receive charging voltage, and the end of oppisite phase on described upper voltage limit comparator is connected with default upper limit reference voltage, the output output detection signal of described upper voltage limit comparator.
4. USB automobile charger automatic shutdown circuitry according to claim 1, is characterized in that: described control circuit comprises switch element, latching relay and reset circuit;
The input stage of described switch element is coupled to upper voltage limit comparing unit to receive detection signal, and the output stage of described switch element is coupled to the actuating coil of latching relay, is in closed condition with the normally opened contact controlling latching relay;
Described reset circuit comprises normally closed switch, and described normally closed switch is coupled to the hold-in winding of latching relay, to control the break-make of the hold-in winding of latching relay.
5. USB automobile charger automatic shutdown circuitry according to claim 2, is characterized in that: described warning circuit comprises buzzer and triode;
The base stage of described triode is coupled to upper voltage limit comparing unit to receive detection signal, and the collector electrode of described triode is coupled to buzzer, to control the keying of buzzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662904.6U CN204167961U (en) | 2014-11-08 | 2014-11-08 | USB automobile charger automatic shutdown circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662904.6U CN204167961U (en) | 2014-11-08 | 2014-11-08 | USB automobile charger automatic shutdown circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204167961U true CN204167961U (en) | 2015-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420662904.6U Expired - Fee Related CN204167961U (en) | 2014-11-08 | 2014-11-08 | USB automobile charger automatic shutdown circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204167961U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852350A (en) * | 2015-06-12 | 2015-08-19 | 林碧琴 | Simple automatic power-off circuit |
| CN104901274A (en) * | 2015-06-12 | 2015-09-09 | 林碧琴 | Self-power-off circuit |
| CN107146739A (en) * | 2017-06-01 | 2017-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Electromagnetic relay low level self-locking control circuit |
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
-
2014
- 2014-11-08 CN CN201420662904.6U patent/CN204167961U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852350A (en) * | 2015-06-12 | 2015-08-19 | 林碧琴 | Simple automatic power-off circuit |
| CN104901274A (en) * | 2015-06-12 | 2015-09-09 | 林碧琴 | Self-power-off circuit |
| CN107146739A (en) * | 2017-06-01 | 2017-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Electromagnetic relay low level self-locking control circuit |
| CN107146739B (en) * | 2017-06-01 | 2020-07-17 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Low-level self-locking control circuit of electromagnetic relay |
| CN113949040A (en) * | 2021-10-19 | 2022-01-18 | 浙江法然特浙科科技有限公司 | Automatic power-off charger system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150218 Termination date: 20181108 |