CN105539319B - Automatic hard-wire control source selection circuit - Google Patents
Automatic hard-wire control source selection circuit Download PDFInfo
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- CN105539319B CN105539319B CN201511026860.3A CN201511026860A CN105539319B CN 105539319 B CN105539319 B CN 105539319B CN 201511026860 A CN201511026860 A CN 201511026860A CN 105539319 B CN105539319 B CN 105539319B
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- triode
- control switch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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Abstract
An automatic hard-wire control source selection circuit relates to the technical field of automobile circuits and solves the technical problems of high power consumption and cost, and poor reliability and response speed of the existing circuit. The circuit comprises a load, a first control switch, a second control switch, a first sampling end, a second sampling end, a triode, a first resistor, a second resistor, a third resistor, a first diode and a second diode; the first sampling end is connected to the base electrode of the triode through the first resistor, the second sampling end is sequentially connected to the collector electrode of the triode through the third resistor and the load, and the base electrode of the triode is connected to the emitter electrode of the triode through the second resistor; the anode of the first diode is connected to the emitter of the triode, and the cathode of the first diode is connected to the first control switch; and the anode of the second diode is connected to the collector of the triode, and the cathode of the second diode is connected to the second control switch. The circuit provided by the invention is suitable for automobile circuits.
Description
Technical Field
The invention relates to an automobile circuit technology, in particular to a technology for automatically selecting a hard-wire control source circuit.
Background
In an automobile electronic system, a vehicle-mounted ECU (electronic control Unit) needs to select a circuit of a control source according to different power supply states, so that hard-wire control source selection circuits are arranged in the automobile electronic systems, can sample Clamp-15 pins and Clamp-30 pins in different power supply states in the voltage of an entire automobile power supply, and select and switch different control sources to control a load after judgment is carried out according to sampling values.
In the existing automobile electronic system, the hard-wire control source selection circuit needs the participation of a microprocessor, and the sampling judgment and the selection switching action are finished by software, and the circuit has the following defects:
1) the power consumption is high: when the whole vehicle is flamed out, a Clamp-15 pin is powered off, most of the ECU in the whole vehicle enters a dormant state, and if the whole microprocessor is awakened only in response to a certain control end requirement, the quiescent current of the ECU after the Clamp-15 is powered off is greatly increased, namely the power consumption of the whole vehicle after flameout is close to the power consumption after ignition;
2) the reliability is low: the microprocessor is responsible for controlling the switching of the load, so that the problems of software failure, chip locking and the like need to be borne, and the more complicated the system, the more error is easy to make;
3) the reaction speed is slow: the load switching is controlled by a microprocessor, the AD sampling requires sampling filtering time of nearly 80ms to 100ms, the response speed of the AD sampling also depends on the response speed of a software system, and particularly when an MCU is turned off and started, the system needs a certain time to initialize or backup data and cannot respond in time;
4) the cost is high: the processing mode of the microprocessor needs additional software development cost besides the cost of the device of the microprocessor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the automatic hard-wire control source selection circuit which is low in power consumption, high in reliability, high in reaction speed and low in cost.
In order to solve the above technical problem, the present invention provides an automatic hard-wired control source selection circuit, which is characterized in that: the circuit comprises a load, a first control switch, a second control switch, a first sampling end, a second sampling end, a triode, a first resistor, a second resistor, a third resistor, a first diode and a second diode;
the first sampling end is connected to the base electrode of the triode through the first resistor, the second sampling end is sequentially connected to the collector electrode of the triode through the third resistor and the load, and the base electrode of the triode is connected to the emitter electrode of the triode through the second resistor;
the anode of the first diode is connected to the emitter of the triode, and the cathode of the first diode is connected to the first control switch;
and the anode of the second diode is connected to the collector of the triode, and the cathode of the second diode is connected to the second control switch.
Further, the first control switch is connected to the ground through a filter capacitor, and the second control switch is connected to the ground through another filter capacitor.
The automatic hard-wire control source selection circuit provided by the invention has the characteristics of simple circuit structure, no need of software participation, high reliability and low cost, does not have active elements such as a microprocessor and the like which need extra power supply, can be completely realized according to a power supply provided by an automobile, does not generate extra current consumption, has the characteristic of low power consumption, particularly has the characteristic of low power consumption in a standby state after the automobile is flamed out, and can quickly react according to the power supply state of the whole automobile at any time due to no dependence on the microprocessor and no AD sampling time, thereby having the characteristic of high reaction speed.
Drawings
FIG. 1 is a circuit diagram of an automatic hardwired control source selection circuit of an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the following description of the drawings, but the embodiments are not intended to limit the present invention, and all similar structures and similar variations using the present invention shall be included in the scope of the present invention, and the pause numbers in the present invention shall have a relation of the same.
As shown in fig. 1, an automatic hard-wired control source selection circuit according to an embodiment of the present invention is characterized in that: the circuit comprises a load D3, a first control switch SW1, a second control switch SW2, a first sampling end X1, a second sampling end X2, a triode T1, a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1 and a second diode D2;
the first sampling end X1 is connected to the base electrode of a triode T1 through a first resistor R1, the second sampling end X2 is connected to the collector electrode of a triode T1 through a third resistor R3 and a load D3 in sequence, and the base electrode of the triode T1 is connected to the emitter electrode of a triode T1 through a second resistor R2;
the anode of the first diode D1 is connected to the emitter of the triode T1, and the cathode of the first diode D1 is connected to the first control switch SW 1;
the anode of the second diode D2 is connected to the collector of the triode T1, and the cathode of the second diode D2 is connected to the second control switch SW 2;
the first control switch SW1 is coupled to ground through a filter capacitor C1, and the second control switch SW2 is coupled to ground through another filter capacitor C2.
In the embodiment of the present invention, the load D3 is a warning light, but in other embodiments of the present invention, the load may be other electrical components.
The embodiment of the invention is suitable for an automobile circuit, when in use, a first sampling end X1 is connected to a whole automobile power supply voltage Clamp-15 pin in the automobile circuit, a second sampling end X2 is connected to a whole automobile power supply voltage Clamp-30 pin in the automobile circuit, and a first control switch SW1 and a second control switch SW2 are respectively connected to two control sources in the automobile circuit;
the first diode D1 and the second diode D2 are isolation elements of the first control switch and the second control switch, and the third resistor R3 is a current-limiting resistor of the protection load D3;
when the first sampling end X1 is powered, the transistor T1 is biased by the first resistor R1, and at this time, if the first control switch SW1 is closed, the transistor T1 is turned on, the load D3 is triggered, and the load D3 is powered from the second sampling end X2, so that the second control switch SW2 is always active; therefore, under the condition that the first sampling terminal X1 is powered, both the first control switch SW1 and the second control switch SW2 can trigger the load D3;
when the first sampling end X1 is powered off, the transistor T1 loses bias, and at this time, no matter what state the first control switch SW1 is in, the transistor T1 cannot be turned on, so that the first control switch SW1 fails, and the second control switch SW2 is always valid because the load D3 obtains power supply from the second sampling end X2; therefore, in case of power-down of the first sampling terminal X1, the load D3 can be triggered only by the second control switch SW 2.
Claims (1)
1. An automatic hardwired control source selection circuit, characterized by: the circuit comprises a load, a first control switch, a second control switch, a first sampling end, a second sampling end, a triode, a first resistor, a second resistor, a third resistor, a first diode and a second diode;
the first sampling end is connected to the base electrode of the triode through the first resistor, the second sampling end is sequentially connected to the collector electrode of the triode through the third resistor and the load, and the base electrode of the triode is connected to the emitter electrode of the triode through the second resistor;
the anode of the first diode is connected to the emitter of the triode, and the cathode of the first diode is connected to one end of the first control switch; the other end of the first control switch is grounded; one end of the first control switch, which is connected with the cathode of the first diode, is connected to the ground through a filter capacitor;
the anode of the second diode is connected to the collector of the triode, and the cathode of the second diode is connected to one end of the second control switch; the other end of the second control switch is grounded; one end of the second control switch, which is connected with the cathode of the second diode, is connected to the ground through another filter capacitor;
the first sampling end is connected to a whole vehicle power supply voltage Clamp-15 pin in the vehicle circuit, the second sampling end is connected to a whole vehicle power supply voltage Clamp-30 pin in the vehicle circuit, and the first control switch and the second control switch are respectively connected to two control sources in the vehicle circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511026860.3A CN105539319B (en) | 2015-12-31 | 2015-12-31 | Automatic hard-wire control source selection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511026860.3A CN105539319B (en) | 2015-12-31 | 2015-12-31 | Automatic hard-wire control source selection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105539319A CN105539319A (en) | 2016-05-04 |
| CN105539319B true CN105539319B (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201511026860.3A Active CN105539319B (en) | 2015-12-31 | 2015-12-31 | Automatic hard-wire control source selection circuit |
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| CN (1) | CN105539319B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906969A (en) * | 1989-02-06 | 1990-03-06 | John Ghazarian | Method and system for protecting automotive appliances against theft |
| CN2134752Y (en) * | 1992-08-10 | 1993-05-26 | 黑士祥 | Energy-saving switch having sound-light dual control |
| WO2012010210A1 (en) * | 2010-07-22 | 2012-01-26 | Deutsche Telekom Ag | Mobile device cradle for vehicle applications |
| US20130129117A1 (en) * | 2011-11-21 | 2013-05-23 | Henrik Thomsen | Audio amplification circuit |
| CN202345414U (en) * | 2011-11-30 | 2012-07-25 | 东风襄樊仪表系统有限公司 | Automobile electronic combination instrument matched with engine conforming China stage-4 emission standard |
| CN203466727U (en) * | 2013-08-14 | 2014-03-05 | 安徽华东光电技术研究所 | Miniwatt voltage stabilizing source circuit |
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2015
- 2015-12-31 CN CN201511026860.3A patent/CN105539319B/en active Active
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| CN105539319A (en) | 2016-05-04 |
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