CN209526656U - Vehicle-mounted low pressure auxiliary power circuit - Google Patents
Vehicle-mounted low pressure auxiliary power circuit Download PDFInfo
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- CN209526656U CN209526656U CN201920414837.9U CN201920414837U CN209526656U CN 209526656 U CN209526656 U CN 209526656U CN 201920414837 U CN201920414837 U CN 201920414837U CN 209526656 U CN209526656 U CN 209526656U
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Abstract
The utility model discloses a kind of vehicle-mounted low pressure auxiliary power circuit, it includes low pressure accessory power supply, power distribution module, linear voltage stabilization module, signal feedback module, controller unit and from control unit；Power distribution module is electrically connected with low pressure accessory power supply and linear voltage stabilization module respectively, and power distribution module is suitable for distributing low pressure accessory power supply voltage to linear voltage stabilization module；Linear voltage stabilization module is electrically connected with from control unit and controller unit respectively；Signal feedback module, signal feedback module are connect with the voltage input end of power distribution module and controller unit signal respectively；Controller unit, controller unit are connect with power distribution module by signal.The utility model has low-power consumption management function, effectively improve low tension battery service efficiency under actual working conditions, significantly reduce the thermal losses of linear voltage stabilization device, to prevent linear voltage stabilization device from permanent damage occurs in excess temperature under the conditions of because continuing working, the reliability of circuit work is improved.
Description
Technical field
The utility model relates to a kind of vehicle-mounted low pressure auxiliary power circuits.
Background technique
As automobile interiors electrifing degree is continuously improved, power electronic technique is in Automobile Design using increasingly
Extensively, typically, the electronic circuit of automotive interior is all to use low pressure lead-acid accumulator as its accessory power supply.In order to improve
Automotive interior low tension battery service life, needs to improve the service efficiency of accessory power supply.Therefore, how for accessory power supply
The key for having become entire automotive interior electronic system performance superiority and inferiority using safely and reliably management is carried out.It is existing vehicle-mounted low
Auxiliary power circuit is pressed, low tension battery power supply is usually directly used in linear voltage stabilization device and carries out voltage conversion, this method
The advantages of be that its circuit design is simply easily realized, but that there are power supply service efficiencies is low, the fever of linear voltage stabilization device is excessively high and
The problems such as causing power source performance to be deteriorated.Currently, the problem low for low pressure accessory power supply service efficiency, although existing some sides
Method introduces low-power consumption management strategy and improves, but these methods are usually all using the power supply with low-power consumption management function
Conversion chip carries out hardware circuit design, to increase parts selection difficulty and device cost in circuit design exploitation, also gives
The mass production of product brings problem.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the deficiencies of existing technologies, and provides a kind of vehicle-mounted low pressure auxiliary
Power circuit, it has low-power consumption management function, effectively improves low tension battery service efficiency under actual working conditions,
The thermal losses of linear voltage stabilization device is significantly reduced, to prevent linear voltage stabilization device because continuing working due to excess temperature under the conditions of
Permanent damage occurs, improves the reliability of circuit work.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is: a kind of vehicle-mounted low pressure auxiliary power circuit,
It includes low pressure accessory power supply, power distribution module, linear voltage stabilization module, signal feedback module, controller unit and single from control
Member；Wherein,
The power distribution module is electrically connected with low pressure accessory power supply and linear voltage stabilization module respectively, the power distribution
Module is suitable for distributing low pressure accessory power supply voltage to linear voltage stabilization module；
The linear voltage stabilization module is electrically connected with from control unit and controller unit respectively, and the linear voltage stabilization module is suitable
In low pressure accessory power supply voltage is converted to from control unit and controller unit needed for voltage；
Signal feedback module, the signal feedback module respectively with the voltage input end of power distribution module and controller list
First signal connection, the signal feedback unit are suitable for acquiring the status information of the voltage input end of power distribution module and feed back to
Controller unit；
Controller unit, the controller unit are connect with power distribution module by signal, and the controller unit is suitable for root
According to the status information control power distribution module work of the voltage input end of power distribution module.
Further, the voltage input end of the power distribution module by low pressure accessory power supply branch and ignition switch branch simultaneously
Join.
Circuit is damaged further for preventing input power to be reversely connected, low pressure accessory power supply branch road is connected with diode
D1, ignition switch branch include the ignition switch K1 and diode D2 being serially connected.
A kind of particular circuit configurations of power distribution module are further provided, the power distribution module includes two
Metal-oxide-semiconductor, multiple diodes and multiple resistance；Wherein,
The voltage input end of power distribution module is connect with the source electrode of two metal-oxide-semiconductors respectively；
The gate drive circuit of metal-oxide-semiconductor Q2 is made of resistance R3, resistance R4 and resistance R5；The output end of ignition switch K1 connects
Meet diode D3, controller unit output end CPU_IO1 connection diode D4, composition or logic gates, with or logic gate electricity
Input terminal of the road as the gate drive circuit of metal-oxide-semiconductor metal-oxide-semiconductor Q2, to control the on-off shape of metal-oxide-semiconductor by controller unit
State；
The gate drive circuit of metal-oxide-semiconductor Q4 is made of resistance R6, resistance R7 and resistance R8, controller unit output end CPU_
Input terminal of the IO2 as the gate drive circuit of metal-oxide-semiconductor Q4, to control the on off operating mode of metal-oxide-semiconductor Q4 by controller unit；
The drain electrode of two metal-oxide-semiconductors is connected to the electricity of linear voltage stabilization module as the voltage output end of power distribution module
Press input terminal.
A kind of particular circuit configurations of signal feedback module are further provided, the signal feedback module includes three poles
Pipe, two comparators and multiple resistance；Wherein,
The output end CPU_INT1 of comparator U1 is connected to the external interrupt input terminal of controller unit, and comparator U1 is just
Phase input terminal is connected to reference voltage Vref 1, and the inverting input terminal of comparator U1 is connected to low pressure auxiliary power output end, described
It is under-voltage whether comparator U1 occurs suitable for monitoring low pressure accessory power supply, and generates interrupt trigger signal CPU_INT1 when under-voltage and come
Notification controller unit handles the interrupt event in time；
The output end CPU_INT2 of comparator U2 is connected to the external interrupt input terminal of controller unit, and comparator U2 is just
Phase input terminal is connected to reference voltage Vref 2, and the inverting input terminal of comparator U2 is connected to the output end of ignition switch K1, described
Comparator U2 is suitable for whether monitors ignition switch K1 turns off, and generates interrupt trigger signal CPU_INT2 when off to notify to control
Device unit processed handles the interrupt event in time；
The emitter-base bandgap grading of triode Q1 is connected to signal ground, and the base stage of triode Q1 is connected to ignition switch K1's by resistance R2
Output end, the collector of triode Q1 are connected to the power supply 5V_M of controller unit, triode Q1 by pull-up resistor R1
Collector the external interrupt input terminal of controller unit is connected to as output end CPU_INT3, the triode Q1 is suitable for prison
It surveys whether ignition switch K1 is closed, and generates interrupt trigger signal CPU_INT3 in closure and carry out notification controller unit and locate in time
Manage the interrupt event.
A kind of particular circuit configurations of linear voltage stabilization module are further provided, the linear voltage stabilization module includes two
Linear transformation chip；Wherein,
Power distribution module output end 12V_M is connected to the input terminal of linear transformation chip U3, and linear transformation chip U3 is defeated
Outlet 5V_MCU is connected to the power input of controller unit, and linear transformation chip U3 is suitable for controller unit power supply；
Power distribution module output end 12V_S is connected to the input terminal of linear transformation chip U4, and linear transformation chip U4 is defeated
Outlet 5V_SLAVE is connected to the power input from control unit, and property conversion chip U4 is suitable for from control unit power supply.
It is each linear further for the transient response ability for the input terminal and output end for improving two linear transformation chips
The input terminal and output end of conversion chip pass through a decoupling capacitor ground connection respectively.
Further for ensuring in lower electric process, linear transformation chip output voltage can be zeroed in time, prevent from linearly turning
It changes electricity under chip output and slowly causes feed problem, it is defeated with it after the input terminal reversal connection diode of each linear transformation chip
Outlet is connected.
After above-mentioned technical proposal, low pressure is assisted electricity under the control of controller unit by the power distribution module
Source voltage is distributed to linear voltage stabilization module, the linear voltage stabilization module low pressure accessory power supply voltage is converted to from control unit again and
Voltage needed for controller unit；The status information of the voltage input end of the signal feedback module acquisition power distribution module is simultaneously anti-
It is fed to controller unit, controller unit is further according to the control power distribution module work of received status signal, the utility model
Suitable for automotive interior low tension battery accessory power supply power-supply service, relative to existing low pressure accessory power supply application circuit, originally
Utility model has low-power consumption management function, effectively improves low tension battery service efficiency, pole under actual working conditions
The earth reduces the thermal losses of linear voltage stabilization device, to prevent linear voltage stabilization device from sending out because continuing working in excess temperature under the conditions of
Raw permanent damage, improves the reliability of circuit work.Meanwhile the utility model uses simple discrete circuit design,
The problems such as increasing type selecting difficulty and cost because using particular power source chip is efficiently solved, and by power supply power supply order
Control and management, realize for electric control in the safety of electric load circuit and low-power consumption management.
Detailed description of the invention
Fig. 1 is the functional block diagram of the vehicle-mounted low pressure auxiliary power circuit of the utility model；
Fig. 2 is the circuit diagram of the vehicle-mounted low pressure auxiliary power circuit of the utility model；
Fig. 3 is the working timing figure of the vehicle-mounted low pressure auxiliary power circuit of the utility model.
Specific embodiment
In order to make the content of the utility model be easier to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail the utility model.
As shown in Figure 1, 2, a kind of vehicle-mounted low pressure auxiliary power circuit, it include low pressure accessory power supply, power distribution module,
Linear voltage stabilization module, signal feedback module, controller unit and from control unit；Wherein,
The power distribution module is electrically connected with low pressure accessory power supply and linear voltage stabilization module respectively, the power distribution
Module is suitable for distributing low pressure accessory power supply voltage to linear voltage stabilization module；
The linear voltage stabilization module is electrically connected with from control unit and controller unit respectively, and the linear voltage stabilization module is suitable
In low pressure accessory power supply voltage is converted to from control unit and controller unit needed for voltage；
Signal feedback module, the signal feedback module respectively with the voltage input end of power distribution module and controller list
First signal connection, the signal feedback unit are suitable for acquiring the status information of the voltage input end of power distribution module and feed back to
Controller unit；
Controller unit, the controller unit are connect with power distribution module by signal, and the controller unit is suitable for root
According to the status information control power distribution module work of the voltage input end of power distribution module.Wherein, low pressure accessory power supply
The 12V of output voltage.Specifically, the signal feedback unit is used to acquire the state letter of the voltage input end of power distribution module
Breath, in fact namely for acquisition low pressure accessory power supply and its status information started switch.
As shown in Fig. 2, the voltage input end of the power distribution module is by low pressure accessory power supply branch and ignition switch branch
Road is formed in parallel.In the present embodiment, input power is reversely connected and damages circuit in order to prevent, and low pressure accessory power supply branch road connects
There is diode D1, ignition switch branch includes the ignition switch K1 and diode D2 being serially connected.Ignition switch K1, that is, low pressure is auxiliary
Help starting switch for power supply.
As shown in Fig. 2, the power distribution module includes two metal-oxide-semiconductors, multiple diodes and multiple resistance；Wherein,
The voltage input end of power distribution module is connect with the source electrode of two metal-oxide-semiconductors respectively；
The gate drive circuit of metal-oxide-semiconductor Q2 is made of resistance R3, resistance R4 and resistance R5；The output end of ignition switch K1 connects
Meet diode D3, controller unit output end CPU_IO1 connection diode D4, composition or logic gates, with or logic gate electricity
Input terminal of the road as the gate drive circuit of metal-oxide-semiconductor metal-oxide-semiconductor Q2, to control the on-off shape of metal-oxide-semiconductor by controller unit
State；
The gate drive circuit of metal-oxide-semiconductor Q4 is made of resistance R6, resistance R7 and resistance R8, controller unit output end CPU_
Input terminal of the IO2 as the gate drive circuit of metal-oxide-semiconductor Q4, to control the on off operating mode of metal-oxide-semiconductor Q4 by controller unit；
The drain electrode of two metal-oxide-semiconductors is connected to the electricity of linear voltage stabilization module as the voltage output end of power distribution module
Press input terminal.In the present embodiment, the metal-oxide-semiconductor is enhanced P-channel metal-oxide-semiconductor.
As shown in Fig. 2, the signal feedback module includes triode, two comparators and multiple resistance；Wherein,
The output end CPU_INT1 of comparator U1 is connected to the external interrupt input terminal of controller unit, and comparator U1 is just
Phase input terminal is connected to reference voltage Vref 1, and the inverting input terminal of comparator U1 is connected to low pressure auxiliary power output end, described
It is under-voltage whether comparator U1 occurs suitable for monitoring low pressure accessory power supply, and generates interrupt trigger signal CPU_INT1 when under-voltage and come
Notification controller unit handles the interrupt event in time, specifically, is adjusted by setting reference voltage Vref 1 and triggers the interruption
Threshold value；
The output end CPU_INT2 of comparator U2 is connected to the external interrupt input terminal of controller unit, and comparator U2 is just
Phase input terminal is connected to reference voltage Vref 2, and the inverting input terminal of comparator U2 is connected to the output end of ignition switch K1, described
Comparator U2 is suitable for whether monitors ignition switch K1 turns off, and generates interrupt trigger signal CPU_INT2 when off to notify to control
Device unit processed handles the interrupt event in time, specifically, the threshold for triggering the interruption is adjusted by setting reference voltage Vref 2
Value；
The emitter-base bandgap grading of triode Q1 is connected to signal ground, and the base stage of triode Q1 is connected to ignition switch K1's by resistance R2
Output end, the collector of triode Q1 are connected to the power supply 5V_M of controller unit, triode Q1 by pull-up resistor R1
Collector the external interrupt input terminal of controller unit is connected to as output end CPU_INT3, the triode Q1 is suitable for prison
It surveys whether ignition switch K1 is closed, and generates interrupt trigger signal CPU_INT3 in closure and carry out notification controller unit and locate in time
Manage the interrupt event.
As shown in Fig. 2, the linear voltage stabilization module includes two linear transformation chips；Wherein,
Power distribution module output end 12V_M is connected to the input terminal of linear transformation chip U3, and linear transformation chip U3 is defeated
Outlet 5V_MCU is connected to the power input of controller unit, and linear transformation chip U3 is suitable for controller unit power supply；
Power distribution module output end 12V_S is connected to the input terminal of linear transformation chip U4, and linear transformation chip U4 is defeated
Outlet 5V_SLAVE is connected to the power input from control unit, and property conversion chip U4 is suitable for from control unit power supply.
As shown in Fig. 2, in order to improve the transient response ability of the input terminal of two linear transformation chips and output end, each
The input terminal and output end of linear transformation chip pass through a decoupling capacitor ground connection respectively.In the present embodiment, linear transformation core
The input terminal of piece U3 is grounded by decoupling capacitor C1, and the output end of linear transformation chip U3 is grounded by decoupling capacitor C2, linearly
The input terminal of conversion chip U4 is grounded by decoupling capacitor C3, and the output end of linear transformation chip U4 is connect by decoupling capacitor C4
Ground.
As shown in Fig. 2, linear transformation chip output voltage can be zeroed in time in order to ensure in lower electric process, line is prevented
Property conversion chip output end under electricity slowly cause feed problem, after the input terminal of each linear transformation chip reversal connection diode with
Its output end is connected.In the present embodiment, turn after the input terminal reversal connection Schottky diode D5 of linear transformation chip U3 with linear
The output end for changing chip U3 is connected；Linear transformation chip U4 input terminal reversal connection Schottky diode D6 after with linear transformation chip
The output end of U4 is connected.
In order to be better described the utility model power circuit the course of work, below with reference to Fig. 3 come to the power supply electricity
The workflow on road is specifically described, and the course of work of entire power circuit can be divided into following section:
The section S0: power circuit is in original state, and low pressure accessory power supply 12V_AUX output voltage is 12V, ignition switch
K1 is in an off state, and ignition switch K1 output end voltage is zero, and controller unit output signal CPU_IO1 and CPU_IO2 is equal
For low level, and interrupt trigger signal CPU_INT1 and interrupt trigger signal CPU_INT3 is high level, and down trigger is believed
Number CPU_INT2 is low level, and metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4 are in off state, and power circuit output voltage 5V_M and 5V_S is equal
It is zero.
The section S1: power circuit is in initial start-up state, and low pressure accessory power supply 12V_AUX output voltage is 12V, igniting
Switch K1 is in closed state for the first time, and ignition switch K1 output end voltage is 12V, controller unit output signal CPU_IO1 and
CPU_IO2 is low level, and interrupt trigger signal CPU_INT1 and interrupt trigger signal CPU_INT2 is high level, interrupts touching
Signalling CPU_INT3 is low level, and ignition switch K1 output end signal gets higher diac D3 and triode Q3 by low for the first time
Conducting, so that enabled metal-oxide-semiconductor Q2 is in the conductive state, power circuit output end 5V_M voltage is 5V, on controller unit starts
Electricity；But metal-oxide-semiconductor Q4 still in off state, then power circuit output end 5V_S voltage is still zero.
The section S2: power circuit is in normal operating condition, and low pressure accessory power supply 12V_AUX output voltage is 12V, igniting
Switch K1 is in closed state, and power output end 5V_M voltage output is normal, and controller unit, which starts to execute, to be powered on and initialized
Journey, after completing peripheral hardware Initialize installation, it is that low level triggers mode, and makes to be able to achieve in outside that setting external interrupt, which triggers mode,
Disconnected response function, at this point, since the interrupt trigger signal CPU_INT3 of external interrupt input is low level signal, then controller list
Member response interrupt trigger signal CPU_INT3, and in the interrupt service program set controller unit output end CPU_IO2 to
High level, and trigger triode Q5 is connected, and then opens metal-oxide-semiconductor Q4, power circuit output end 5V_S voltage is 5V, then single from control
Member starts power up, and in controller unit and after control unit completion power-up initializing, whole system starts to operate normally.
The section S3: power circuit is in low power consumpting state, and low pressure accessory power supply 12V_AUX output voltage is 12V, and igniting is opened
K1 is closed to be in an off state, then ignition switch K1 output end voltage is zero, and interrupt trigger signal CPU_INT2 starts to be lower by height,
Controller unit is influenced in normal course of operation by external interrupt trigger signal CPU_INT2 triggering, and controller unit enters
Corresponding interrupt service routine, and high level first is set by output end CPU_IO1, guarantee that metal-oxide-semiconductor Q2 is defeated in ignition switch K1
It remains to tend to remain on after signal zero out, i.e., controller unit still powers on；Low electricity is set by output end CPU_IO2 again
Flat, so that triode Q5 and metal-oxide-semiconductor Q4 be in off state, then power circuit output end 5V_S voltage zero, i.e., other are from control
Unit starts lower electricity；Then, master controller executes dormancy instruction and enters low power consumpting state.
The section S4: power circuit is in wake-up states, and low pressure accessory power supply 12V_AUX output voltage is 12V, ignition switch
K1 is again at closed state, then ignition switch K1 output end voltage is 12V, and interrupt trigger signal CPU_INT3 starts to be become by height
Low, controller unit is influenced during Low-power-consumptiodormancy dormancy by external interrupt trigger signal CPU_INT3 triggering, controller list
Member starts to be waken up and operate normally, and enters corresponding interrupt service routine, and controller unit output end CPU_IO2 is weighed
It newly is set as high level, again trigger triode Q5 and metal-oxide-semiconductor Q4 conducting, then power circuit output end 5V_S voltage is restored to
5V, i.e., other from control unit re-power, whole system restarts to operate normally.
The section S5: power circuit is in power-down state, in actual condition, low pressure accessory power supply 12V_AUX output voltage
When lower than 8V, external interrupt trigger signal CPU_INT1 signal is lower by height, if controller unit is in normal operation shape at this time
State, controller unit will be influenced by down trigger and entered in corresponding interrupt service routine, controller unit output end
CPU_IO1 is arranged to low level, while driver being reminded to need to stop in due course due to the under-voltage event of low pressure accessory power supply occurs
And close ignition switch；If controller unit is in Low-power-consumptiodormancy dormancy state, controller unit will be influenced by down trigger and
It wakes up, and enters in corresponding interrupt service routine, while also setting low level for controller unit output end CPU_IO1；
At this point, triode Q3 and metal-oxide-semiconductor Q2 are turned off, power circuit output end 5V_M voltage zero, whole system is in power-down state.
The working principle of the utility model is as follows:
The power distribution module distributes low pressure accessory power supply voltage to linear voltage stabilization under the control of controller unit
Module, the linear voltage stabilization module are again converted to low pressure accessory power supply voltage from voltage needed for control unit and controller unit；
The status information of the voltage input end of the signal feedback module acquisition power distribution module simultaneously feeds back to controller unit, controls
Device unit is stored further according to the control power distribution module work of received status signal, the utility model suitable for automotive interior low pressure
Battery-assisted power supplies power-supply service, relative to existing low pressure accessory power supply application circuit, the utility model has low-power consumption pipe
Function is managed, low tension battery service efficiency under actual working conditions is effectively improved, significantly reduces linear voltage regulator
The thermal losses of part improves to prevent linear voltage stabilization device from permanent damage occurs in excess temperature under the conditions of because continuing working
The reliability of circuit work.Meanwhile the utility model uses simple discrete circuit design, efficiently solves because using spy
The problems such as determining power supply chip and increasing type selecting difficulty and cost, and by the control and management to power supply power supply order, it realizes and supplies
Electric control and low-power consumption management in the safety of electric load circuit.
Particular embodiments described above, to the utility model solve the technical issues of, technical scheme and beneficial effects into
It has gone further description, it should be understood that the foregoing is merely specific embodiment of the utility model, and has not had to
In limitation the utility model, within the spirit and principle of the utility model, any modification, equivalent substitution and improvement done
Deng should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of vehicle-mounted low pressure auxiliary power circuit, it is characterised in that: it includes low pressure accessory power supply, power distribution module, line
Property Voltage stabilizing module, signal feedback module, controller unit and from control unit；Wherein,
The power distribution module is electrically connected with low pressure accessory power supply and linear voltage stabilization module respectively, the power distribution module
Suitable for distributing low pressure accessory power supply voltage to linear voltage stabilization module；
The linear voltage stabilization module is electrically connected with from control unit and controller unit respectively, and the linear voltage stabilization module is suitable for will
Low pressure accessory power supply voltage is converted to from voltage needed for control unit and controller unit；
Signal feedback module, the signal feedback module are believed with the voltage input end of power distribution module and controller unit respectively
Number connection, the signal feedback unit be suitable for acquire power distribution module voltage input end status information simultaneously feed back to control
Device unit；
Controller unit, the controller unit are connect with power distribution module by signal, and the controller unit is suitable for according to electricity
The status information control power distribution module work of the voltage input end of source distribution module.
2. vehicle-mounted low pressure auxiliary power circuit according to claim 1, it is characterised in that: the electricity of the power distribution module
Pressure input terminal is formed by low pressure accessory power supply branch and ignition switch branch circuit parallel connection.
3. vehicle-mounted low pressure auxiliary power circuit according to claim 2, it is characterised in that: low pressure accessory power supply branch road connects
It is connected to diode D1, ignition switch branch includes the ignition switch K1 and diode D2 being serially connected.
4. vehicle-mounted low pressure auxiliary power circuit according to claim 3, it is characterised in that: the power distribution module includes
Two metal-oxide-semiconductors, multiple diodes and multiple resistance；Wherein,
The voltage input end of power distribution module is connect with the source electrode of two metal-oxide-semiconductors respectively；
The gate drive circuit of metal-oxide-semiconductor Q2 is made of resistance R3, resistance R4 and resistance R5；The output end connection two of ignition switch K1
Pole pipe D3, controller unit output end CPU_IO1 connection diode D4, composition or logic gates, with or logic gates make
For the input terminal of the gate drive circuit of metal-oxide-semiconductor metal-oxide-semiconductor Q2, to pass through the on off operating mode that controller unit controls metal-oxide-semiconductor；
The gate drive circuit of metal-oxide-semiconductor Q4 is made of resistance R6, resistance R7 and resistance R8, controller unit output end CPU_IO2
The input terminal of gate drive circuit as metal-oxide-semiconductor Q4, to control the on off operating mode of metal-oxide-semiconductor Q4 by controller unit；
The voltage that the drain electrode of two metal-oxide-semiconductors is connected to linear voltage stabilization module as the voltage output end of power distribution module is defeated
Enter end.
5. vehicle-mounted low pressure auxiliary power circuit according to claim 4, it is characterised in that: the signal feedback module includes
Triode, two comparators and multiple resistance；Wherein,
The output end CPU_INT1 of comparator U1 is connected to the external interrupt input terminal of controller unit, and the positive of comparator U1 is defeated
Enter end and be connected to reference voltage Vref 1, the inverting input terminal of comparator U1 is connected to low pressure auxiliary power output end, the comparison
It is under-voltage whether device U1 occurs suitable for monitoring low pressure accessory power supply, and generates interrupt trigger signal CPU_INT1 when under-voltage to notify
Controller unit handles the interrupt event in time；
The output end CPU_INT2 of comparator U2 is connected to the external interrupt input terminal of controller unit, and the positive of comparator U2 is defeated
Enter end and be connected to reference voltage Vref 2, the inverting input terminal of comparator U2 is connected to the output end of ignition switch K1, the comparison
Device U2 is suitable for whether monitors ignition switch K1 turns off, and generates interrupt trigger signal CPU_INT2 when off and carry out notification controller
Unit handles the interrupt event in time；
The emitter-base bandgap grading of triode Q1 is connected to signal ground, and the base stage of triode Q1 is connected to the output of ignition switch K1 by resistance R2
End, the collector of triode Q1 are connected to the power supply 5V_M of controller unit, the collection of triode Q1 by pull-up resistor R1
Electrode is connected to the external interrupt input terminal of controller unit as output end CPU_INT3, and the triode Q1 is suitable for monitoring point
Whether fire switch K1 is closed, and in closure generates interrupt trigger signal CPU_INT3 and carry out notification controller unit and handle this in time
Interrupt event.
6. vehicle-mounted low pressure auxiliary power circuit according to claim 5, it is characterised in that: the linear voltage stabilization module packet
Include two linear transformation chips；Wherein,
Power distribution module output end 12V_M is connected to the input terminal of linear transformation chip U3, linear transformation chip U3 output end
5V_MCU is connected to the power input of controller unit, and linear transformation chip U3 is suitable for controller unit power supply；
Power distribution module output end 12V_S is connected to the input terminal of linear transformation chip U4, linear transformation chip U4 output end
5V_SLAVE is connected to the power input from control unit, and property conversion chip U4 is suitable for from control unit power supply.
7. vehicle-mounted low pressure auxiliary power circuit according to claim 6, it is characterised in that: each linear transformation chip it is defeated
Enter end and output end and passes through a decoupling capacitor ground connection respectively.
8. vehicle-mounted low pressure auxiliary power circuit according to claim 6, it is characterised in that: each linear transformation chip it is defeated
It is connected after entering end reversal connection diode with its output end.
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| CN201920414837.9U CN209526656U (en) | 2019-03-28 | 2019-03-28 | Vehicle-mounted low pressure auxiliary power circuit |
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| CN201920414837.9U CN209526656U (en) | 2019-03-28 | 2019-03-28 | Vehicle-mounted low pressure auxiliary power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861521A (en) * | 2019-03-28 | 2019-06-07 | 常州索维尔电子科技有限公司 | Vehicle-mounted low pressure auxiliary power circuit |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861521A (en) * | 2019-03-28 | 2019-06-07 | 常州索维尔电子科技有限公司 | Vehicle-mounted low pressure auxiliary power circuit |
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Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee after: Changzhou Shiwei Electronics Co.,Ltd. Address before: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. |