CN202939712U - Protective circuit of intelligent water meter integrated circuit (IC) cards - Google Patents
Protective circuit of intelligent water meter integrated circuit (IC) cards Download PDFInfo
- Publication number
- CN202939712U CN202939712U CN 201220659263 CN201220659263U CN202939712U CN 202939712 U CN202939712 U CN 202939712U CN 201220659263 CN201220659263 CN 201220659263 CN 201220659263 U CN201220659263 U CN 201220659263U CN 202939712 U CN202939712 U CN 202939712U
- Authority
- CN
- China
- Prior art keywords
- resistance
- card seat
- resistor
- interface
- water meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Credit Cards Or The Like (AREA)
Abstract
The utility model relates to a protective circuit of intelligent water meter integrated circuit (IC) cards. The protective circuit of the intelligent water meter IC cards is characterized by comprising a single chip, a transistor V, a switch K1 and an IC card seat, a first input/output (I/O) interface of the single chip is connected with a base of the transistor V, a collector of the transistor V is connected with a base pin 1 of the IC card seat and one end of a resistor R4, a second I/O interface of the single chip is connected with a base pin 2 of the IC card seat, a third I/O interface of the single chip is respectively connected with a base pin 3 of the IC card seat, one end of a resistor R5 and one end of the switch K1, other three I/O interfaces of the single chip are respectively connected with one ends of a base pin 4, a base pin 5 and a base pin 6 of the IC card seat and one ends of a resistor R1, a resistor R2 and a resistor R3, and the other ends of the resistor R1, and the resistor R2, the resistor R3, the resistor R4 and the switch K1 and a base pin 7 of the IC card seat are connected with a power source VCC. The protective circuit of the intelligent water meter IC cards is reasonable in design, has the advantages of being simple in structure, low in power consumption and stable and reliable in performance, and can be widely used for the application of protecting the intelligent water meter IC cards.
Description
Technical field
The utility model belongs to the intellectual water meter technical field, especially a kind of intellectual water meter IC-card holding circuit.
Background technology
At present, intellectual water meter is the optimal path that water resource management department realizes the automation and intelligentification management.Intellectual water meter install and use thorough traditional way to manage of checking meter and paying that changed, being particularly suitable for unit administration departments and the water sectors such as newly-built residential quarter, office building, office, factories and miness, school, is an important channel that solves difficult charge problem and energy-saving and emission-reduction.In the intellectual water meter use procedure, often need the plug IC-card, intellectual water meter inside need to arrange the IC-card holding circuit IC-card is protected, and the problem that existing IC-card holding circuit exists is: the problems such as circuit is complicated, power consumption is high.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of reasonable in design, intellectual water meter IC-card holding circuit that circuit is simple and low in energy consumption is provided.
The utility model solves its technical matters and takes following technical scheme to realize:
a kind of intellectual water meter IC-card holding circuit, comprise single-chip microcomputer, transistor V, K switch 1 and IC-card seat, single-chip microcomputer the one I/O interface is connected with the base stage of transistor V, the collector of this transistor V is connected with an end of the pin one of IC-card seat and resistance R 4, the emitter of this transistor V is connected to the ground and connects, the 2nd I/O interface of single-chip microcomputer is connected with the pin two of IC-card seat, the 3rd I/O interface of single-chip microcomputer and the pin 3 of IC-card seat, resistance R 5 one ends and K switch 1 one ends are connected, the 4th I/O interface of single-chip microcomputer, the 5th I/O interface and the 6th I/O interface respectively with the pin 4 of IC-card seat, pin 5, pin 6 and resistance R 1, resistance R 2, one end of resistance R 3 is connected, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the pin 7 of the other end of K switch 1 and IC-card seat is connected with power supply VCC, the other end of resistance R 5 is connected to the ground and connects.
Advantage of the present utility model and good effect are:
The utility model is reasonable in design; it realizes the IC-card circuit is protected by single-chip microcomputer and transistor; have characteristics simple in structure, low in energy consumption, stable and reliable for performance, can be widely used in the IC-card protection application of intellectual water meter, equally also be applicable in the IC-card protection application of intelligent electric meter.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
a kind of intellectual water meter IC-card holding circuit, as shown in Figure 1, comprise single-chip microcomputer, transistor V, K switch 1 and IC-card seat, single-chip microcomputer is connected with the base stage of transistor V by I/O interface RB1, the collector of this transistor V is connected with an end of the pin one of IC-card seat and resistance R 4, the emitter of this transistor V is connected to the ground and connects, the I/O interface RB2 of single-chip microcomputer is connected with the pin two of IC-card seat, the I/O interface RB3 of single-chip microcomputer and the pin 3 of IC-card seat, resistance R 5 one ends and K switch 1 one ends are connected, the I/O interface RB4 of single-chip microcomputer, RB5, RB6 respectively with the pin 4 of IC-card seat, pin 5, pin 6 and resistance R 1, resistance R 2, one end of resistance R 3 is connected, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the pin 7 of the other end of IC K switch 1 and IC-card seat is connected with power supply VCC, the other end of resistance R 5 is connected to the ground and connects.
The principle of work of this IC-card holding circuit is:
Under normal circumstances, when IC-card inserted deck, K switch 1 was connected, and makes V
R5=VCC, this signal is read by the input port RB3 of single-chip microcomputer, and meanwhile single-chip microcomputer reads the voltage condition of RB2 mouth, V in normal plug-in card situation
RB2=0V, i.e. low level, at this moment, the RB1 of single-chip microcomputer does delivery outlet and makes transistor V conducting, and namely the deck pin one is ground connection, and single-chip microcomputer is by RB4, and RB5 and RB6 interface begin to carry out communication with IC-card, until read-write card finishes.
When IC-card was anti-inserted, single-chip microcomputer was by RB4, and RB5 and RB6 interface and IC-card can't be set up communication, and this moment, cue card was wrong.
Under extreme case, cause whole deck short circuit when inserting sheet metal in deck, this moment, K1 connected, V
RB3=V
CC, but V
RB2=V
CC, it is abnormal that single-chip microcomputer detects in deck plug-in card by the RB2 mouth, closed the RB1 mouth, do not make transistor V conducting, be high level on the IC-card seat so always, only have on resistance R 3 current drain is arranged, we are very large the choosing of R3 resistance, generally 1M, and VCC is lithium battery voltage 3V, and the power consumption on R3 is 3 microamperes of left and right so through calculating, and is very limited, because the interface of single-chip microcomputer and deck is all to be arranged to the input port at ordinary times, so there is no interface microcontroller, the high level of 3V causes damage.Thereby formed the protection to IC-card.
It is emphasized that; embodiment described in the utility model is illustrative; rather than determinate; therefore the utility model comprises and is not limited to the embodiment described in embodiment; every by those skilled in the art according to other embodiments that the technical solution of the utility model draws, belong to equally the scope of the utility model protection.
Claims (1)
1. intellectual water meter IC-card holding circuit, it is characterized in that: comprise single-chip microcomputer, transistor V, K switch 1 and IC-card seat, single-chip microcomputer the one I/O interface is connected with the base stage of transistor V, the collector of this transistor V is connected with an end of the pin one of IC-card seat and resistance R 4, the emitter of this transistor V is connected to the ground and connects, the 2nd I/O interface of single-chip microcomputer is connected with the pin two of IC-card seat, the 3rd I/O interface of single-chip microcomputer and the pin 3 of IC-card seat, resistance R 5 one ends and K switch 1 one ends are connected, the 4th I/O interface of single-chip microcomputer, the 5th I/O interface and the 6th I/O interface respectively with the pin 4 of IC-card seat, pin 5, pin 6 and resistance R 1, resistance R 2, one end of resistance R 3 is connected, resistance R 1, resistance R 2, resistance R 3, resistance R 4, the pin 7 of the other end of K switch 1 and IC-card seat is connected with power supply VCC, the other end of resistance R 5 is connected to the ground and connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220659263 CN202939712U (en) | 2012-12-04 | 2012-12-04 | Protective circuit of intelligent water meter integrated circuit (IC) cards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220659263 CN202939712U (en) | 2012-12-04 | 2012-12-04 | Protective circuit of intelligent water meter integrated circuit (IC) cards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202939712U true CN202939712U (en) | 2013-05-15 |
Family
ID=48323940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220659263 Expired - Fee Related CN202939712U (en) | 2012-12-04 | 2012-12-04 | Protective circuit of intelligent water meter integrated circuit (IC) cards |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202939712U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108256364A (en) * | 2017-12-29 | 2018-07-06 | 浙江大华技术股份有限公司 | A kind of IC card hot plug detection circuit |
-
2012
- 2012-12-04 CN CN 201220659263 patent/CN202939712U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108256364A (en) * | 2017-12-29 | 2018-07-06 | 浙江大华技术股份有限公司 | A kind of IC card hot plug detection circuit |
| CN108256364B (en) * | 2017-12-29 | 2020-12-29 | 浙江大华汽车技术有限公司 | IC card hot plug detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205050134U (en) | Portable power source TYPE -C interface management circuit | |
| CN203759164U (en) | Circuit for detecting access state of USB load equipment | |
| CN103983836B (en) | Electric energy meter full decompression detection method | |
| CN104502649B (en) | Low-power consumption single-phase intelligent power meter | |
| CN202939712U (en) | Protective circuit of intelligent water meter integrated circuit (IC) cards | |
| CN205353147U (en) | IC -card targets in place and detects power control circuit | |
| CN201425723Y (en) | Switch of dual hard disk power lines | |
| CN204330838U (en) | A kind of low-power consumption single-phase intelligent electric energy meter | |
| CN204631098U (en) | A kind of three-phase LED Multi-functional digital display electrical measuring meter | |
| CN206804840U (en) | Battery data logging device | |
| CN105425029A (en) | Low-power-consumption single-phase smart electric energy meter | |
| CN105866533B (en) | A kind of Multifunctional single-phase time-sharing electricity meter | |
| CN206331107U (en) | Power failure detection circuit of single-phase intelligent electric meter | |
| CN208801946U (en) | A kind of power control circuit of OBD terminal | |
| CN203966243U (en) | A kind of prepayment meter | |
| CN206819200U (en) | Dummy load control circuit | |
| CN201616139U (en) | Outdoor IC card motor-pumped well irrigation charging control device | |
| CN206302185U (en) | A kind of dual input battery charging switching circuit and intelligent electronic device | |
| CN206136310U (en) | A equipment for discerning house model | |
| CN204649926U (en) | A kind of single-phase electric energy meter on-load switch break-make identification circuit | |
| CN206505372U (en) | It is a kind of to prevent the fail-safe computer mainboard of electric leakage | |
| CN206421375U (en) | A kind of computer glitch detection means | |
| CN205103346U (en) | IC -card emulation testing arrangement with level protect function | |
| CN202916912U (en) | Smart card isolation type electric energy meter | |
| CN204631218U (en) | A kind of single-phase electric energy meter on-load switch break-make identification circuit |
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 |
Granted publication date: 20130515 Termination date: 20141204 |
|
| EXPY | Termination of patent right or utility model |