CN101345521B - Intelligentized vehicle power switch - Google Patents
Intelligentized vehicle power switch Download PDFInfo
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- CN101345521B CN101345521B CN2008101963576A CN200810196357A CN101345521B CN 101345521 B CN101345521 B CN 101345521B CN 2008101963576 A CN2008101963576 A CN 2008101963576A CN 200810196357 A CN200810196357 A CN 200810196357A CN 101345521 B CN101345521 B CN 101345521B
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Abstract
The invention relates to intelligentized automobile power switch comprising power drive module and main controller for controlling power drive module. The power drive module consists of MOSFET tube, signal collection circuit, comparison circuit, juder and signal encoder. The signal collection circuit comprises load voltage coefficient collection circuit, load current coefficient collection circuit; the encoder encodes the voltage coefficient and current coefficient to a group of binary data to convey to main controller in analog serial data mode and input control signal coming from main controller into judger; the comparison circuit preprocesses voltage difference signal and current difference signal and input it into judger; the judger integratively controls the signal, compares circuit signals, controls MOSFET on-off, that is, when voltage or current difference exceeds the set value, the judger emits a signal for shutting off power output of MOSFET S end and transmits the alarm signal to main controller through encoder.
Description
Technical field
The present invention relates to the control field of power of vehicle electrical equipment, particularly be used to control 24V～48V in the smart power switch of resistive and perceptual power of vehicle electrical equipment.
Background technology
The domestic smart power switch that adopts is that MOSFET and relevant protection, driving and signal encoding output circuit are integrated into a chips basically at present; though the printed circuit plate bulk reduces greatly after being integrated into 1 chips; but almost can not be used to control high-power (the power of vehicle electric equipment more than the 30A～50A) in the practice occasion; the parameters such as load capacity of this chip are all solidified when chip manufacturing simultaneously, though in the practice process the small variation in a place also may have to select for use again this type of chip of other specifications.Any part damage expansion chips is promptly scrapped in this chip simultaneously, can't repair.
Summary of the invention
The object of the invention is to overcome the defective of prior art, provides that a kind of cost is low, flexible configuration, is easy to safeguard and be applicable to the Intelligentized vehicle power switch of high-power Control of Automobile electric equipment.
The technical scheme that realizes the object of the invention is: Intelligentized vehicle power switch, comprise power driver module and the master controller that is used for the power controlling driver module, it is characterized in that described power driver module is made of MOSFET pipe, signal acquisition circuit, comparison circuit, determining device, protective circuit, warning circuit and signal coder;
Described signal acquisition circuit comprises:
Load voltage coefficient Acquisition Circuit is connected between MOSFET D end and the reference voltage source, by relatively drawing the voltage coefficient of MOSFET D end with reference voltage source, and this voltage coefficient is sent to encoder;
Load current coefficient Acquisition Circuit is connected in MOSFET S end, by relatively drawing the current coefficient of MOSFET S end with reference current source, and this current coefficient is sent to encoder;
Described encoder should described voltage coefficient and current coefficient be encoded into one group of binary data, export to described master controller with similar serial data mode, and the control signal input determining device of autonomous controller in the future;
Described comparison circuit comprises:
Voltage comparator circuit compares MOSFET D terminal voltage and reference voltage source, and sends this voltage difference to first pre-process circuit; With
First pre-process circuit carries out logical process with the MOSFET D, the S pole tension stream difference that receive, is logic level 1 when greater than the setting voltage difference promptly, is logic level 0 during less than the setting voltage difference, and with voltage logic level signal input determining device;
Current comparison circuit compares MOSFET S end electric current and reference power source, and sends this electric current difference to second pre-process circuit; With
Second pre-process circuit, to carry out logical process from the MOSFET S electrode current difference of the input of current comparison circuit, being logic level 1 when greater than the setting current value promptly, is logic storage battery 0 during less than the setting current value, and with electric current logic level signal input determining device;
Described determining device, its input is connected with encoder with first, second pre-process circuit, its output is connected with MOSFET G end, receive control signal, voltage and current logic level signal, composite control signal and logic level signal are judged, control MOSFET manages break-make, and judged result is fed back to encoder;
Described main controller sends the control signal of binary coded data to power driver module, realizes the control to the closed or disconnection of power electrical equipment.
Among the present invention; described power driver module is by the collection of load voltage coefficient, current coefficient collection, MOSFET temperature sensing hardware circuit; load voltage comparison, current ratio reach overload, overcurrent judgement, protection and alarm signal feedback hardware circuit, and signal encoding output hardware circuit constitutes.The load voltage coefficient is gathered, current coefficient acquisition hardware circuit is realized by current coefficient and the D pole tension coefficient of monitoring MOSFET; Simultaneously, voltage comparator circuit, current comparison circuit have been formed the accident overload second protection and the warning circuit of this module, realize that promptly automatically cutting off module by logical circuit when load during more than or equal to default limiting value exports.Simultaneously to the control of this module by main controller with control signal, one group of binary coded data sends this module to realize the closed of power electrical equipment or the control that disconnects.
As a further improvement on the present invention, also comprise temperature sensing circuit in the described power driver module, be used to obtain the temperature parameter of MOSFET, and temperature parameter is transferred to encoder, encoder is transferred to master controller with this temperature signal with one group of binary data again.Described temperature sense circuit be installed on the MOSFET heat dispersion substrate on.
As a further improvement on the present invention, the judgement of described determining device specifically can be achieved as follows: when receiving the signal of control MOSFET D, the conducting of S end, when judging that signal voltage or electric current difference are in range of set value, send signal for MOSFET G end, make the conducting of MOSFET D, S end, driving power electrical equipment; When voltage or electric current difference surpass the voltage set or current value, send the signal of the power output of cutting off MOSFET S end, and alarm signal is transferred to master controller by encoder; Promptly in the signal of exporting in first and second pre-process circuits, when arbitrary signal was logic level 1, determining device cut off MOSFET G and extremely opens signal.
The present invention utilize MOSFET and separate electronic device integrated a kind of smart power switch cheaply, all electronic components of other of this MOSFET and integrated this smart power switch are realized the control (the particularly above power electrical equipment of 15A) of power of vehicle electrical equipment by same PCB as carrier, and realize functions such as electric current, voltage, temperature monitoring and the output of reporting to the police; When this switch applies to automobile when control, can most of combination that replaces relay+fuse; And this intelligent power driver module can be with the different local circuits couplings of adjusting smart power switchs of different automobile types configuration to reach flexible and changeable, to be easy to safeguard and to be specially adapted to the tighter high-power control occasion of cost requirement.
The invention has the advantages that:
1. utilize the autonomous integrated intelligent power driver module of MOSFET and separating electronic components (as logic chip, surge diode, current monitoring circuit), can realize that the flexible configuration different parameters is to realize the power of vehicle electrical equipment control of different loads situation;
2. this power driver module can be realized 30A～50A, and peak value can reach the control of the power of vehicle electrical equipment (comprising resistive and inductive load) of 80A;
3. the control of this module can be passed through the main controller loading condition of monitoring modular at any time, when the output that any overload situations all can cut off module by master controller occurring;
4. this power driver module has suitable self-protection ability, when fortuitous event (as the master controller inefficacy etc.) promptly occurring, because the setting of determining device and protective circuit, this module still possesses the overload protection ability, and overload protection not exclusively relies on master controller;
This power switch module since control and information output all realize with binary data, can apply in the automobile bus.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is the power connection structure schematic diagram of the embodiment of the invention 1 power driver module;
Fig. 4 is the embodiment of the invention 1 master controller and driver module connection diagram.
Embodiment
Be described further below in conjunction with accompanying drawing.
Embodiment 1
As shown in Figure 1, Intelligentized vehicle power switch comprises power driver module and is used for the master controller of power controlling driver module, power driver module by MOSFET pipe, signal acquisition circuit, comparison circuit, determining device, and signal coder constitute.
Signal acquisition circuit comprises: load voltage coefficient Acquisition Circuit, be connected between MOSFET D end and the S end, and relatively draw the voltage coefficient that MOSFET D holds by holding, and this voltage coefficient is sent to encoder with S; With load current coefficient Acquisition Circuit, be connected in MOSFET S end, by relatively drawing the current coefficient of MOSFET S end, and this current coefficient is sent to encoder with reference current source.
Encoder should described voltage coefficient and current coefficient be encoded into one group of binary data, with similar serial data mode output, and the control signal input determining device of autonomous controller in the future.
Comparison circuit comprises: voltage comparator circuit, compare MOSFET D terminal voltage and reference voltage source, and send this voltage difference to first pre-process circuit; With first pre-process circuit, the MOSFET D, the S pole tension stream difference that receive are carried out logical process, when greater than the setting voltage difference, be logic level 1 promptly, be logic level 0 during less than the setting voltage difference, and with voltage logic level signal input determining device; Current comparison circuit is held electric current and reference power source relatively with MOSFETS, and sends this electric current difference to second pre-process circuit; With second pre-process circuit, to carry out logical process from the MOSFET S electrode current difference of the input of current comparison circuit, being logic level 1 when greater than the setting current value promptly, is logic storage battery 0 during less than the setting current value, and with electric current logic level signal input determining device;
Determining device, its input is connected with encoder with first, second pre-process circuit, its output is connected with the MOSFETG end, receive control signal, voltage and current logic level signal, composite control signal and logic level signal, control MOSFET manages break-make, and judged result is fed back to encoder;
Main controller is with control signal, and promptly one group of binary coded data sends power driver module to realize the control to the closed or disconnection of power electrical equipment.
As shown in Figure 2, each separating electronic components is formed following functional module, that is: MOSFET control function module, voltage, current monitoring functional module, secondary protection function module, temperature-monitoring function module and signal encoding functional module.
Triode Q1, Q2, Q3, Q4, Q5 etc. form control circuit and the second protection determining device of MOSFET.When the D of MOSFET in power driver module best S utmost point Continuity signal by port J2 and when the encoder U10, encoder U10 is decoded into control signal 1 I/O signal and is sent to the determining device circuit of being made up of triode Q3, Q4 and R7, D1, D2, R8 etc. 1 by triode Q2 by resistance R 3, the stable back of R4.As not having overvoltage phenomenon and over-current phenomenon avoidance this moment, then triode Q3, Q4 conducting, control triode Q5 conducting then, finally add the voltage of 12V at the G of the MOSFET utmost point, the D utmost point and the conducting of the S utmost point of MOSFET at this moment, electric current is from 24V1 flow through D, the load of S best, and the load that MOSFET controlled (power of vehicle electrical equipment) is started working.
In the process of MOSFET work (after D, the conducting of the S utmost point), voltage monitoring, overvoltage protection and current foldback circuit that the D pole tension of MOSFET is formed by chip U1A, U1B, triode Q6, Q7 always monitor.The D pole tension is through resistance R 15, and the voltage collection circuit of being made up of chip U1A and other electronic devices 2 is gathered, and this information is sent to coding chip U10, can directly be sent to master controller behind this information via coding; The comparison circuit of D pole tension through depending on chip U1A and reference voltage source (5V) comparison of master controller transmission simultaneously, if be higher than reference source, then represent the D pole tension (being 24V1) surpass the voltage that MOSFET bore, this moment, above-mentioned determining device blocked the triode Q5 of control MOSFET conducting, MOSFET quits work, and alarm signal of this circuit output is to encoder simultaneously.In the process of MOSFET work, triode Q6, Q7, chip U1B form current comparison circuit 3, when the S of MOSFET electrode current value and reference source relatively surpass preset value, block triode Q5 by the same manner, MOSFET is quit work, export an alarm signal simultaneously to encoder U10.
Chip U1 and attached device thereof are formed current acquisition current circuit 4, and when MOSFET worked, U1 gathered the S electrode current of MOSFET, and this current parameters is sent to encoder, and encoder is sent to master controller with current signal again.
Chip U2, the resistance with temperature characterisitic and other electronic devices are formed the temperature sense circuit; the temperature sensitive device of the important component part of circuit is close to the heat dispersion substrate that is installed on MOSFET; when occur ambient temperature too high, continuously for a long time when adverse circumstances work causes that the MOSFET temperature is too high MOSFET or other circuit may to occur damaging; temperature protection circuit is started working; promptly cut off MOSFET output by determining device and triode Q5; automatically recover MOSFET work after temperature is recovered again, simultaneously this alarm signal is sent to encoder.
When encoder U10 received above voltage, electric current or overload protection signal, this encoder was compiled into a series of binary data by simple logic function and can exports the master controller and the analog selection switch of this power driver module of control by the J2 port to.Master controller is again according to its electric current, voltage signal, by the pre-set programs decision how to the control of power driver module.
As shown in Figure 3, being controlled in most cases of vehicle complete vehicle power electrical equipment will be finished by this power driver module, control cost and reduce the shared circuit board of intelligent power driver module (PCB) space for reducing car load, required 24V, 12V, the 5V power supply of this module provided by master controller respectively.
As shown in Figure 4, a master controller is controlled some power driver modules simultaneously, and power of vehicle electrical equipment quantity power driver module quantity and that controlled is suitable, finishes the Based Intelligent Control of 24V～48V power of vehicle electric equipment.
The present invention utilizes MOSFET, other separating electronic components compositions (as logic chip, surge diode, current monitoring circuit) compositions to comprise utilization MOSFET to the automatic protection of control, load voltage, current monitoring and the overload situations of power of vehicle electrical equipment, the temperature information of MOSFET; voltage, electric current and other information are exported with communication modes by binary coding, the function of automatic disconnection and output alarm signal when electric current, voltage and the working temperature of being born when the power switch module reaches the limit load of the limit load of MOSFET or load.
Claims (7)
1. Intelligentized vehicle power switch, comprise power driver module and the master controller that is used for the power controlling driver module, it is characterized in that described power driver module is made of MOSFET pipe, signal acquisition circuit, comparison circuit, protective circuit, determining device and signal coder;
Described signal acquisition circuit comprises:
Load voltage coefficient Acquisition Circuit is connected between MOSFET D end and the S end, relatively draws the voltage coefficient that MOSFET D holds by holding with S, and this voltage coefficient is sent to encoder;
Load current coefficient Acquisition Circuit is connected in MOSFET S end, by relatively drawing the current coefficient of MOSFET S end with reference current source, and this current coefficient is sent to encoder;
Described signal coder should described voltage coefficient and current coefficient be encoded into one group of binary data, export to described master controller with serial data mode, and the control signal input determining device of autonomous controller in the future;
Described comparison circuit comprises:
Voltage comparator circuit compares MOSFET D terminal voltage and S terminal voltage, and sends this voltage difference to first pre-process circuit; With
First pre-process circuit carries out logical process with the MOSFET D, the S pole tension stream difference that receive, is logic level 1 when greater than the setting voltage difference promptly, is logic level 0 during less than the setting voltage difference, and with voltage logic level signal input determining device;
Current comparison circuit compares MOSFET S end electric current and reference power source, and sends this electric current difference to second pre-process circuit; With
Second pre-process circuit, to carry out logical process from the MOSFET S electrode current difference of the input of current comparison circuit, being logic level 1 when greater than the setting current value promptly, is logic level 0 during less than the setting current value, and with electric current logic level signal input determining device;
Described determining device, its input is connected with encoder with first, second pre-process circuit, its output is connected with MOSFET G end, receive control signal, voltage and current logic level signal, composite control signal and logic level signal are judged, control MOSFET manages break-make, and judged result is fed back to encoder;
Described main controller sends the control signal of binary coded data to power driver module, realizes the control to the closed or disconnection of power electrical equipment.
2. power switch according to claim 1, it is characterized in that, described power driver module also comprises temperature sensing circuit, is used for and the MOSFET temperature parameter is transferred to encoder, and encoder is transferred to master controller with this temperature signal with one group of binary data again.
3. power switch according to claim 1, it is characterized in that, described determining device control MOSFET pipe break-make further comprises: when receiving the signal of control MOSFET D, the conducting of S end, when judging that signal voltage or electric current difference are in range of set value, send signal for MOSFET G end, make the conducting of MOSFET D, S end, driving power electrical equipment; When voltage or electric current difference surpass the voltage set or current value, send the signal of the power output of cutting off MOSFET S end, and alarm signal is transferred to master controller by encoder.
4. power switch according to claim 1 is characterized in that described protective circuit is made up of discrete resistance, electric capacity, zener diode and triode.
5. power switch according to claim 1 is characterized in that, the required power supply of described power driver module is provided by master controller.
6. power switch according to claim 1 is characterized in that described power switch comprises some power driver modules, and a master controller is controlled some power driver modules simultaneously.
7. power switch according to claim 2 is characterized in that, described temperature sense circuit is installed on the MOSFET heat dispersion substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101963576A CN101345521B (en) | 2008-09-05 | 2008-09-05 | Intelligentized vehicle power switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101963576A CN101345521B (en) | 2008-09-05 | 2008-09-05 | Intelligentized vehicle power switch |
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| Publication Number | Publication Date |
|---|---|
| CN101345521A CN101345521A (en) | 2009-01-14 |
| CN101345521B true CN101345521B (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101963576A Expired - Fee Related CN101345521B (en) | 2008-09-05 | 2008-09-05 | Intelligentized vehicle power switch |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096041A (en) * | 2010-11-26 | 2011-06-15 | 中国北方车辆研究所 | Load state detecting method based on intelligent power electronic switch |
| CN105216649A (en) * | 2015-11-03 | 2016-01-06 | 成都雅骏新能源汽车科技股份有限公司 | A kind of novel entire car controller being applicable to pure electric automobile |
| US9966943B2 (en) * | 2016-03-31 | 2018-05-08 | Infineon Technologies Ag | System and method for a high-side power switch |
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Granted publication date: 20110112 Termination date: 20130905 |