CN103067103A - Signal generator with self-diagnostic function - Google Patents
Signal generator with self-diagnostic function Download PDFInfo
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- CN103067103A CN103067103A CN2012105794234A CN201210579423A CN103067103A CN 103067103 A CN103067103 A CN 103067103A CN 2012105794234 A CN2012105794234 A CN 2012105794234A CN 201210579423 A CN201210579423 A CN 201210579423A CN 103067103 A CN103067103 A CN 103067103A
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Abstract
A signal generator with a self-diagnostic function comprises a microprogrammed control unit (MCU), a plurality of signal drive modules and a plurality of low frequency antennas, wherein an input end of each signal drive module is connected with a pulse-width modulation (PWM) port of the MCU, and an output end of each signal drive module is connected with each low frequency antenna in a one-to-one corresponding mode. The signal generator with the self-diagnostic function is characterized by further comprising a plurality of low frequency antenna diagnostic circuits. An input end of each low frequency antenna diagnostic circuit is connected with each low frequency antenna in a one-to-one corresponding mode. An output end of each low frequency antenna diagnostic circuit is connected with an input/output (I/O) port of the MCU. According to the signal generator with the self-diagnostic function, running conditions of the low frequency antennas can be diagnosed constantly, and output of the MCU can be regulated in time. The signal generator with the self-diagnostic function is convenient to repair and capable of being widely applicable to the field of signal generators.
Description
Technical field
The present invention relates to a kind of low frequency generator, relate in particular to the signal generator that has self-diagnostic function in a kind of automotive keyless entering system.
Background technology
Automotive keyless entering system is called for short PKE(PASSIVE KEYLESS ENTER), adopted the state-of-the-art RFID wireless radio-frequency in the world and state-of-the-art testing vehicle register code recognition system.Present employedly enter and the signal generator that starts control system without key, comprise singlechip controller MCU, RFID drives chip and low-frequency antenna, singlechip controller MCU wherein drives chip with some RFID and is connected, drive chip output baseband signal to RFID, drive chip by RFID again and be modulated to a certain fixed frequency, form carrier signal; The number of low-frequency antenna is identical with the number that RFID drives chip, and connects one to one with RFID driving chip, and the carrier signal that modulation is formed sends; RFID driving chip does not have the fault diagnosis functions to low-frequency antenna.Drive chip for RFID, its price is higher, and particularly a signal generation apparatus usually needs 5 ~ 7, causes the cost of signal generator higher.
A kind of signal generation apparatus is disclosed such as Chinese patent application numbers 201020534817.4, comprise MCU, some signal transmission modules and some low-frequency antennas, the input of each signal transmission module connects respectively the PWM port of MCU, and output and each low-frequency antenna connect one to one, MCU produces modulated low frequency carrier signal signal, send into corresponding signal transmission module by the PWM port of institute's gating, the low-frequency antenna that is passed through to connect by this signal transmission module again sends.This kind signal generation apparatus does not re-use traditional RFID and drives chip, and use the lower metal-oxide-semiconductor of price or triode instead, reduce holistic cost, and the low frequency carrier signal signal that MCU produces is by the PWM port driver signal transmission module that carries, affected by cell voltage less, improved the stability of work.But the signal generator of this invention does not have automatic monitoring and regulatory function, thereby may cause owing to the damage of local circuit the damage of integrated circuit, and can not accurately hold in-problem components and parts, and maintenance is inconvenient.
Summary of the invention
The purpose of this invention is to provide a kind of signal generator with self-diagnostic function, solve the operation conditions that existing signal generator can not be diagnosed low-frequency antenna constantly, adjust the problem of MCU output and maintenance difficult.
The technical solution adopted for the present invention to solve the technical problems is: a kind of signal generator with self-diagnostic function, comprise MCU, some signal driver modules, some low-frequency antennas, the input of each signal driver module connects respectively the PWM port of MCU, and output and each low-frequency antenna connect one to one, and also are provided with some low-frequency antenna diagnostic circuits, each low-frequency antenna diagnostic circuit input and each low-frequency antenna connect one to one, and output is connected with the I/O port of MCU.
Preferably, described MCU has at least one PWM port, and each PWM port and signal driver module connect one to one.
Further, the first signal line that described signal driver module is arranged in parallel and secondary signal line, first signal line comprise the capacitor C 4 that is connected in series, resistance R 4 and triode Q2A, the secondary signal line comprises the capacitor C 6 that is connected in series, resistance R 10 and triode Q2B.
Further, the low-frequency antenna fault diagnosis circuit comprises triode Q1; If during low-frequency antenna drive circuit output high level signal, if in the normal connecting system circuit of low-frequency antenna load this moment, triode Q1 conducting is high level on the I/O port of high level signal arrival singlechip controller MCU; If this moment the low-frequency antenna load open circuit, triode Q1 cut-off, it is low level that low level signal arrives on the I/O port of singlechip controller MCU.
Be the electric current of control signal driver module, described signal driver module input also is provided with current-limiting resistance R7.
Be protection PWM port, also be provided with the clamped circuit of protection PWM port on the PWM port of described MCU.
For improving the switching speed of triode, also be provided with capacitor C 5 between described first signal line and the secondary signal line.
For improving the stability of transistor base, also be provided with diode D1, diode D3, diode D4; Described diode D1 is in parallel with triode Q2A, and described diode D3 is in parallel with triode Q1, and described diode D4 is in parallel with triode Q2B.
Beneficial effect of the present invention: the operating state of monitoring constantly the low-frequency antenna load by the low-frequency antenna diagnostic circuit, when low-frequency antenna occurs when unusual, abnormal signal is fed back to the I/O port of MCU, stop the work of low-frequency antenna by MCU, prevent that low-frequency antenna from further damaging.Described signal driver module adopts audion, and is simple in structure, with low cost, effectively reduces the cost of signal generator; Described resistance R 7 plays the effect of current-limiting protection circuit, and described clamped circuit has well been protected the PWM port of MCU; The switching speed of capacitor C 5 Effective Raise triodes, described diode D1, diode D3, diode D4 can improve the stability of transistor base.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Embodiment, as shown in Figure 1 and Figure 2, a kind of signal generator with self-diagnostic function comprises MCU1, some signal driver modules 2, some low-frequency antennas 3, the input of each signal driver module 2 connects respectively the PWM port of MCU1, and output and each low-frequency antenna 3 connect one to one, and also are provided with some low-frequency antenna diagnostic circuits 4, each low-frequency antenna diagnostic circuit 4 input and each low-frequency antenna 3 connect one to one, and output is connected with the I/O port of MCU1.Described MCU1 has at least one PWM port, and each PWM port and signal driver module 2 connect one to one.Wherein signal driver module 2, low-frequency antenna 3 are identical with the number of low-frequency antenna diagnostic circuit 4, are generally 5 to 7.
The first signal line that described signal driver module 2 is arranged in parallel and secondary signal line, first signal line comprise the capacitor C 4 that is connected in series, and resistance R 4 and triode Q2A, secondary signal line comprise the capacitor C 6 that is connected in series, resistance R 10 and triode Q2B.Low-frequency antenna fault diagnosis circuit 4 comprises triode Q1; If during low-frequency antenna drive circuit 4 output high level signal, if in the normal connecting system circuit of low-frequency antenna 3 loads this moment, triode Q1 conducting is high level on the I/O port of high level signal arrival singlechip controller MCU; If this moment low-frequency antenna 3 load open circuits, triode Q1 cut-off, it is low level that low level signal arrives on the I/O port of singlechip controller MCU1.
Be the electric current of control signal driver module 2, described signal driver module 2 inputs also are provided with current-limiting resistance R7.Be protection PWM port, also be provided with the clamped circuit of protection PWM port on the PWM port of described MCU1.For improving the switching speed of triode, also be provided with capacitor C 5 between described first signal line and the secondary signal line.For improving the stability of transistor base, also be provided with diode D1, diode D3, diode D4; Described diode D1 is in parallel with triode Q2A, and described diode D3 is in parallel with triode Q1, and described diode D4 is in parallel with triode Q2B.
The PWM port of described singlechip controller MCU1 provides 5V, during the square wave source positive pulse of 125KHz, through current-limiting resistance R7, coupling capacitance C4, C6 filtering low frequency component is respectively by resistance R 4, resistance R 10, arrive the base stage of triode Q2A and triode Q2B, at this moment triode Q2A cut-off, triode Q2B conducting, output low level 0V.Singlechip controller MCU provide 5V, during the square wave source negative pulse of 125KHz, through current-limiting resistance R7, coupling capacitance C4, C6 filtering low frequency component, respectively by resistance R 4, resistance R 10, the base stage of arrival triode Q2A and triode Q2B, at this moment triode Q2A conducting, triode Q2B cut-off, output high level 12V.Wherein R7, R4, R10 select 750 Ω, and C4 and C6 select 10nF/50V, and triode Q2A and triode Q2B form the double-triode valve components and parts, and the components and parts model is the PBSS4140DPN of NXP.
Pulse signal after the amplification is through the resonant circuit of low-frequency antenna 3, and the harmonic component of filtering 125KHz produces the sine wave signal of 125KHz, outwards gives off the field signal of enough large 125KHz.Low-frequency antenna fault diagnosis circuit 4 is by resistance R 3, resistance R 2, resistance R 5, capacitor C 3, the compositions such as triode Q1.The resistance of described resistance R 3, R5 is 2.2K Ω, and the resistance of resistance R 2 is 10K Ω, and capacitor C 3 is selected 10nF/50V, and the model of triode Q1 is 3DG9011.When signal driver module output high level signal 12V, high level signal is through resistance R 3, if in the normal connecting system circuit of low-frequency antenna load this moment, triode Q1 conducting is high level 5V on the I/O port of high level signal through R2 arrival singlechip controller MCU; If this moment the low-frequency antenna load open circuit, triode Q1 cut-off, low level signal arrives on the I/O port of singlechip controller MCU through R2 be low level 0V.The diagnostic circuit signal that MCU receives according to the I/O port is in time adjusted the break-make of low-frequency antenna, improves the reliability and safety of low-frequency antenna.Can pass through the external diagnostic equipment of MCU in addition, detect the fault components and parts of signal generator inside.
Described current-limiting resistance R7 selects 750 Ω, and described clamped circuit is composed in series by diode D2 and capacitor C 2, and the model of diode D2 is BAT54S, and the electric capacity of capacitor C 2 is 100nF/50V, and the model of diode D1, D3, D4 is BAT54S.Described C5 selects 1nF/50V.Resistance R 8 on the described low-frequency antenna resonant circuit, the resistance of R9 are 15 Ω, and the resistance of the resistance R 6 between triode Q1 and low-frequency antenna resonant circuit is 10K Ω, and the capacitor C 7 on the low-frequency antenna resonant circuit is selected 1nF/50V.Resistance R 1 on the signal driver module, the resistance of R11 are 10 Ω, and capacitor C 1 is selected 100nF/50V.
Claims (10)
1. signal generator with self-diagnostic function, comprise MCU, some signal driver modules, some low-frequency antennas, the input of each signal driver module connects respectively the PWM port of MCU, and output and each low-frequency antenna connect one to one, and it is characterized in that: also be provided with some low-frequency antenna diagnostic circuits, each low-frequency antenna diagnostic circuit input and each low-frequency antenna connect one to one, and output is connected with the I/O port of MCU.
2. the signal generator with self-diagnostic function according to claim 1, it is characterized in that: described MCU has at least one PWM port, and each PWM port and signal driver module connect one to one.
3. the signal generator with self-diagnostic function according to claim 1 and 2, it is characterized in that: the first signal line that described signal driver module is arranged in parallel and secondary signal line, the first signal line comprises the capacitor C 4 that is connected in series, resistance R 4 and triode Q2A, the secondary signal line comprises the capacitor C 6 that is connected in series, resistance R 10 and triode Q2B.
4. the signal generator with self-diagnostic function according to claim 1 and 2, it is characterized in that: described low-frequency antenna fault diagnosis circuit comprises triode Q1; If during low-frequency antenna drive circuit output high level signal, if in the normal connecting system circuit of low-frequency antenna load this moment, triode Q1 conducting is high level on the I/O port of high level signal arrival singlechip controller MCU; If this moment the low-frequency antenna load open circuit, triode Q1 cut-off, it is low level that low level signal arrives on the I/O port of singlechip controller MCU.
5. the signal generator with self-diagnostic function according to claim 3, it is characterized in that: described signal driver module input also is provided with current-limiting resistance R7.
6. the signal generator with self-diagnostic function according to claim 3 is characterized in that: the clamped circuit that also is provided with protection PWM port on the PWM port of described MCU.
7. the signal generator with self-diagnostic function according to claim 3 is characterized in that: also be provided with capacitor C 5 between described first signal line and the secondary signal line.
8. according to claim 5 to the described signal generator with self-diagnostic function of 7 any one, it is characterized in that: also be provided with diode D1, diode D3, diode D4; Described diode D1 is in parallel with triode Q2A, and described diode D3 is in parallel with triode Q1, and described diode D4 is in parallel with triode Q2B.
9. the signal generator with self-diagnostic function according to claim 5, it is characterized in that: wherein resistance R 7, R4, R10 all select 750 Ω, capacitor C 4 and C6 select 10nF/50V, triode Q2A and triode Q2B form the double-triode valve components and parts, and the components and parts model is the PBSS4140DPN of NXP.
10. the signal generator with self-diagnostic function according to claim 4 is characterized in that: described low-frequency antenna fault diagnosis circuit 4 is by resistance R 3, resistance R 2, and resistance R 5, capacitor C 3, triode Q1 forms; The resistance of described resistance R 3, R5 is 2.2K Ω, and the resistance of resistance R 2 is 10K Ω, and capacitor C 3 is selected 10nF/50V, and the model of triode Q1 is 3DG9011.
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| CN2012105794234A CN103067103A (en) | 2012-12-27 | 2012-12-27 | Signal generator with self-diagnostic function |
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| CN2012105794234A CN103067103A (en) | 2012-12-27 | 2012-12-27 | Signal generator with self-diagnostic function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030874A (en) * | 2018-05-31 | 2018-12-18 | 昌辉汽车电器（黄山）股份公司 | A kind of short-circuit detecting circuit of vehicle switch |
| CN109030874B (en) * | 2018-05-31 | 2024-06-04 | 昌辉汽车电器（黄山）股份公司 | Short circuit detection circuit of automobile switch |
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| CN1744476A (en) * | 2004-08-31 | 2006-03-08 | 中兴通讯股份有限公司 | Method and device for detecting connection state of antenna and feed line |
| CN1941678A (en) * | 2005-09-27 | 2007-04-04 | 三星电子株式会社 | Wireless communication module, wireless communication apparatus having wireless communication module, and control method thereof |
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| CN201838168U (en) * | 2010-09-13 | 2011-05-18 | 同致电子科技（厦门）有限公司 | Signal generation device |
| JP2011179214A (en) * | 2010-03-01 | 2011-09-15 | Alps Electric Co Ltd | Mobile device of keyless entry device |
| CN202093535U (en) * | 2011-05-17 | 2011-12-28 | 利尔达科技有限公司 | Low frequency card read-write device |
| CN202583350U (en) * | 2012-04-12 | 2012-12-05 | 上海纳恩汽车技术有限公司 | Low frequency antenna fault diagnosis device |
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Patent Citations (7)
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|---|---|---|---|---|
| CN1744476A (en) * | 2004-08-31 | 2006-03-08 | 中兴通讯股份有限公司 | Method and device for detecting connection state of antenna and feed line |
| CN1941678A (en) * | 2005-09-27 | 2007-04-04 | 三星电子株式会社 | Wireless communication module, wireless communication apparatus having wireless communication module, and control method thereof |
| WO2007095891A1 (en) * | 2006-02-20 | 2007-08-30 | Conti Temic Microelectronic Gmbh | Radio-based locking system |
| JP2011179214A (en) * | 2010-03-01 | 2011-09-15 | Alps Electric Co Ltd | Mobile device of keyless entry device |
| CN201838168U (en) * | 2010-09-13 | 2011-05-18 | 同致电子科技（厦门）有限公司 | Signal generation device |
| CN202093535U (en) * | 2011-05-17 | 2011-12-28 | 利尔达科技有限公司 | Low frequency card read-write device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030874A (en) * | 2018-05-31 | 2018-12-18 | 昌辉汽车电器（黄山）股份公司 | A kind of short-circuit detecting circuit of vehicle switch |
| CN109030874B (en) * | 2018-05-31 | 2024-06-04 | 昌辉汽车电器（黄山）股份公司 | Short circuit detection circuit of automobile switch |
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Application publication date: 20130424 |