CN202602251U - Port protection circuit used for keyless entry system - Google Patents
Port protection circuit used for keyless entry system Download PDFInfo
- Publication number
- CN202602251U CN202602251U CN 201220215286 CN201220215286U CN202602251U CN 202602251 U CN202602251 U CN 202602251U CN 201220215286 CN201220215286 CN 201220215286 CN 201220215286 U CN201220215286 U CN 201220215286U CN 202602251 U CN202602251 U CN 202602251U
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- triode
- circuit
- protection circuit
- resistance
- chip microcomputer
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Abstract
The utility model discloses a port protection circuit used for a keyless entry system. The port protection circuit comprises a single-chip microcomputer and an IO output port electrically connected therewith. The circuit further comprises an IO drive circuit electrically connected to a front end of the IO output port, and a current limiting clamp circuit that is respectively in electric connection with the single-chip microcomputer and the IO drive circuit. The port protection circuit used for the keyless entry system needs no relay to drive an IC, has a current limiting protection function, and is simple in circuit connection, low in cost and long in service life.
Description
Technical field
The utility model relates to a kind of port protection circuit, relates in particular to a kind of IO port protection circuit that is used for keyless access system.
Background technology
Along with science and technology is brought in constant renewal in and development; The antitheft smart electronics scheme of using on the automobile is also various in style; Wherein a kind of comparatively common mode is that remote keyless gets into system (PKE:PASSIVE KEYLESS ENTER); It adopts most advanced world radio frequency identification (RFID:Radio Frequency IDentification) technology and state-of-the-art testing vehicle register code recognition system; Chip induction automatic switch door lock in the smart card of carrying through the car owner that is to say that when you walk close to the vehicle certain distance antitheft can opened and remove to door lock automatically; When you left vehicle, door lock was understood on the automatic locking and is got into anti-theft state.
The signal of the IO port of keyless access system output comprises control signals such as locking, unblank, rise window, loudspeaker, and these output signals are according to the difference of vehicle, and what have is used for directly driving relay, and what have then directly exports negative signal.Existing use relay is as the circuit (shown in Figure 1) of the keyless access system of signal output; Its single-chip microcomputer 1 is directly controlled the output of IO ports 3 through a relay drive IC 2; Though sort circuit can drive big electric current; But need to use the relay drive IC of model as ULN2003, cost is comparatively high.Moreover existing keyless access system circuit I O output port does not have protective circuit, can not play the effect of current limliting, in case the output connection mistake will cause short circuit, thereby burns out insurance.In addition, the relay that uses in the existing keyless access system circuit is limited mechanical endurance, change comparatively trouble, and its volume is bigger, output port more for a long time, the layout of circuit board is difficulty comparatively.
The utility model content
The utility model proposes a kind of port protection circuit that is used for keyless access system, and it need not the relay drive IC, and circuit connects simple, has the current-limiting protection function, and cost is lower and the life-span is longer.
For realizing above-mentioned purpose; The utility model provides a kind of port protection circuit that is used for keyless access system; Comprise: a single-chip microcomputer, the IO output port that electrically connects with this single-chip microcomputer, it also comprises the IO drive circuit that is electrically connected at IO output port front end, the current limliting clamp circuit that electrically connects with single-chip microcomputer and IO drive circuit respectively.
Wherein, said IO output port front end also is electrically connected with a diode D1.
IO drive circuit in the utility model can be metal-oxide-semiconductor, and this metal-oxide-semiconductor one end and IO output port electrically connect, and the other end and current limliting clamp circuit electrically connect.
Perhaps, said IO drive circuit can also be a triode Q1, and this triode Q1 one end and IO output port electrically connect, and the other end and current limliting clamp circuit electrically connect.
Particularly; Said triode Q1 is a NPN type triode; The base stage of this NPN type triode electrically connects with single-chip microcomputer and current limliting clamp circuit respectively, and the collector electrode of NPN type triode and IO output port electrically connect, and the emitter of NPN type triode and current limliting clamp circuit electrically connect.
Further; Comprise a triode Q2 in the current limliting clamp circuit in the utility model, and the resistance R 2 that electrically connects of triode Q2, be electrically connected at the resistance R 1 between triode Q2 emitter and the resistance R 2; The collector electrode of this triode Q2 is electrically connected between single-chip microcomputer and the triode Q1 base stage, and resistance R 1 all electrically connects with triode Q1 emitter with resistance R 2.
Moreover, also electrically connecting a resistance R 3 between said single-chip microcomputer and the triode Q1 base stage, the collector electrode of triode Q2 is electrically connected between this resistance R 3 and the triode Q1 base stage.
The utility model is used for the port protection circuit of keyless access system, and it need not to use the relay drive IC, and cost is comparatively cheap, and does not have the restriction in useful life; Moreover it is through the current-limiting protection of diode realization output port, even also can not burn insurance after the short circuit; In addition, its circuit connects comparatively simple, even output port is more for a long time, and also can be comparatively easily at the enterprising row wiring of circuit board.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 uses relay to connect sketch map as the circuit of the keyless access system of signal output in the prior art;
Fig. 2 is used for a kind of specific embodiment of port protection circuit of keyless access system for the utility model circuit connects sketch map.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 2; The utility model provides a kind of port protection circuit that is used for keyless access system; It comprises a single-chip microcomputer 10, with the IO output port 20 that this single-chip microcomputer 10 electrically connects, also comprise the IO drive circuit that is electrically connected at IO output port 10 front ends, the current limliting clamp circuit 30 that electrically connects with this single-chip microcomputer 10 and IO drive circuit respectively.The utility model cooperates current limliting clamp circuit 30 through the IO drive circuit, can realize the output circuit with overcurrent protection, and not only the circuit connection is comparatively simple, and need not the relay drive IC, does not have the restriction in useful life, can also reduce cost to a certain extent.
In the utility model specific embodiment; Said IO output port 20 front ends also are electrically connected with a diode D1; D1 not only can realize the afterflow protective effect through this diode; Can also drive the inductive load of relay types, when needs drive more high-current equipment, only need can realize through an external relay.
Special, the IO drive circuit in the utility model can be a metal-oxide-semiconductor (not shown), and this metal-oxide-semiconductor one end and IO output port 20 electrically connect, and the other end and current limliting clamp circuit 30 electrically connect.Perhaps, as the another kind of selectivity embodiment of the utility model, said IO drive circuit can also be a large power triode Q1, and this triode Q1 one end and IO output port 20 electrically connect, and the other end and current limliting clamp circuit 30 electrically connect.In the utility model specific embodiment; Said triode Q1 can be a NPN type triode; The base stage of this NPN type triode electrically connects with single-chip microcomputer 10 and current limliting clamp circuit 30 respectively; The collector electrode of NPN type triode and IO output port 20 electrically connect, and the emitter of NPN type triode and current limliting clamp circuit 30 electrically connect.
Further; Comprise a triode Q2 in the current limliting clamp circuit 30 in the utility model, and the resistance R 2 that electrically connects of triode Q2, be electrically connected at the resistance R 1 between triode Q2 emitter and the resistance R 2; The collector electrode of this triode Q2 is electrically connected between single-chip microcomputer and the triode Q1 base stage, and resistance R 1 all electrically connects with triode Q1 emitter with resistance R 2.
Moreover the utility model also electrically connects a resistance R 3 between single-chip microcomputer 10 and triode Q1 base stage, and the collector electrode of triode Q2 is electrically connected between this resistance R 3 and the triode Q1 base stage.
The port protection circuit that is used for keyless access system of the utility model, it need not to use the relay drive IC, and circuit connects comparatively simple, even output port is more for a long time, also can be comparatively easily at the enterprising row wiring of circuit board.The utility model uses triode Q1 as drive circuit, and the drive current of 2A can be provided, and its resistance R 1 is the current limliting power resistor; When electric current surpassed 2A, the resistance at resistance R 1 two ends reached the conducting voltage of triode Q2, and then triode Q2 opens; The voltage of triode Q1 base stage is dragged down; Triode Q1 ends, thereby has realized the effect to output port current-limiting protection, even also can not burn insurance after the short circuit.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (7)
1. port protection circuit that is used for keyless access system; The IO output port that comprises a single-chip microcomputer, electrically connects with this single-chip microcomputer; It is characterized in that, also comprise the IO drive circuit that is electrically connected at IO output port front end, the current limliting clamp circuit that electrically connects with single-chip microcomputer and IO drive circuit respectively.
2. the port protection circuit that is used for keyless access system as claimed in claim 1 is characterized in that, said IO output port front end also is electrically connected with a diode D1.
3. the port protection circuit that is used for keyless access system as claimed in claim 1 is characterized in that said IO drive circuit is a metal-oxide-semiconductor, and this metal-oxide-semiconductor one end and IO output port electrically connect, and the other end and current limliting clamp circuit electrically connect.
4. the port protection circuit that is used for keyless access system as claimed in claim 1 is characterized in that, said IO drive circuit is a triode Q1, and this triode Q1 one end and IO output port electrically connect, and the other end and current limliting clamp circuit electrically connect.
5. the port protection circuit that is used for keyless access system as claimed in claim 4; It is characterized in that; Said triode Q1 is a NPN type triode; The base stage of this NPN type triode electrically connects with single-chip microcomputer and current limliting clamp circuit respectively, and the collector electrode of NPN type triode and IO output port electrically connect, and the emitter of NPN type triode and current limliting clamp circuit electrically connect.
6. the port protection circuit that is used for keyless access system as claimed in claim 5; It is characterized in that; Comprise a triode Q2 in the said current limliting clamp circuit, and the resistance R 2 that electrically connects of triode Q2, be electrically connected at the resistance R 1 between triode Q2 emitter and the resistance R 2; The collector electrode of this triode Q2 is electrically connected between single-chip microcomputer and the triode Q1 base stage, and resistance R 1 all electrically connects with triode Q1 emitter with resistance R 2.
7. the port protection circuit that is used for keyless access system as claimed in claim 6; It is characterized in that; Also electrically connect a resistance R 3 between said single-chip microcomputer and the triode Q1 base stage, the collector electrode of triode Q2 is electrically connected between this resistance R 3 and the triode Q1 base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215286 CN202602251U (en) | 2012-05-14 | 2012-05-14 | Port protection circuit used for keyless entry system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220215286 CN202602251U (en) | 2012-05-14 | 2012-05-14 | Port protection circuit used for keyless entry system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202602251U true CN202602251U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220215286 Expired - Lifetime CN202602251U (en) | 2012-05-14 | 2012-05-14 | Port protection circuit used for keyless entry system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202602251U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
| CN109188050A (en) * | 2018-09-13 | 2019-01-11 | 哈尔滨理工大学 | A kind of dielectric conduction current measuring device |
-
2012
- 2012-05-14 CN CN 201220215286 patent/CN202602251U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
| CN107528298B (en) * | 2017-09-11 | 2020-08-14 | 深圳传音制造有限公司 | Protection circuit of electronic load and electronic load |
| CN109188050A (en) * | 2018-09-13 | 2019-01-11 | 哈尔滨理工大学 | A kind of dielectric conduction current measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121212 |
|
| CX01 | Expiry of patent term |