CN109861521B - Vehicle-mounted low-voltage auxiliary power supply circuit - Google Patents
Vehicle-mounted low-voltage auxiliary power supply circuit Download PDFInfo
- Publication number
- CN109861521B CN109861521B CN201910243262.3A CN201910243262A CN109861521B CN 109861521 B CN109861521 B CN 109861521B CN 201910243262 A CN201910243262 A CN 201910243262A CN 109861521 B CN109861521 B CN 109861521B
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supply
- controller unit
- low
- input end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009826 distribution Methods 0.000 claims abstract description 52
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005316 response function Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Control Of Voltage And Current In General (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a vehicle-mounted low-voltage auxiliary power supply circuit which comprises a low-voltage auxiliary power supply, a power supply distribution module, a linear voltage stabilizing module, a signal feedback module, a controller unit and a slave control unit, wherein the power supply distribution module is connected with the low-voltage auxiliary power supply; the power distribution module is respectively and electrically connected with the low-voltage auxiliary power supply and the linear voltage stabilizing module, and is suitable for distributing the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module; the linear voltage stabilizing module is respectively and electrically connected with the slave control unit and the controller unit; the signal feedback module is respectively connected with the voltage input end of the power distribution module and the controller unit in a signal way; and the controller unit is in signal connection with the power distribution module. The invention has the low power consumption management function, effectively improves the use efficiency of the low-voltage storage battery under the actual working condition, and greatly reduces the heat loss of the linear voltage stabilizing device, thereby preventing the linear voltage stabilizing device from being permanently damaged due to continuous working under the over-temperature condition and improving the working reliability of the circuit.
Description
Technical Field
The invention relates to a vehicle-mounted low-voltage auxiliary power supply circuit.
Background
With the continuous increase of the electrification degree of the internal structure of the automobile, the power electronic technology is increasingly widely applied to the automobile design, and in general, the electronic circuit in the automobile uses a low-voltage lead acid storage battery as an auxiliary power supply. In order to improve the service life of the low-voltage storage battery in the automobile, the service efficiency of the auxiliary power supply needs to be improved. Therefore, how to safely and reliably manage the use of auxiliary power has become a key to the performance of the electronic system inside the whole automobile. The existing vehicle-mounted low-voltage auxiliary power supply circuit generally uses a low-voltage storage battery power supply directly for voltage conversion of a linear voltage stabilizing device, and the method has the advantages of being simple in circuit design and easy to realize, but has the problems that the power supply is low in use efficiency, the linear voltage stabilizing device is too high in heating, the power supply performance is poor, and the like. At present, although the existing methods introduce low-power management strategies to improve the problem of low use efficiency of the low-voltage auxiliary power supply, the methods generally adopt a power supply conversion chip with a low-power management function to carry out hardware circuit design, so that the difficulty of device type selection and the cost of devices in circuit design development are increased, and the problem is also brought to mass production of products.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a vehicle-mounted low-voltage auxiliary power supply circuit, has a low-power consumption management function, effectively improves the use efficiency of a low-voltage storage battery under the actual working condition, greatly reduces the heat loss of a linear voltage stabilizing device, thereby preventing the linear voltage stabilizing device from being permanently damaged due to continuous working under the over-temperature condition, and improving the working reliability of the circuit.
In order to solve the technical problems, the technical scheme of the invention is as follows: the vehicle-mounted low-voltage auxiliary power supply circuit comprises a low-voltage auxiliary power supply, a power supply distribution module, a linear voltage stabilizing module, a signal feedback module, a controller unit and a slave control unit; wherein,
The power distribution module is respectively and electrically connected with the low-voltage auxiliary power supply and the linear voltage stabilizing module, and is suitable for distributing the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module;
The linear voltage stabilizing module is respectively and electrically connected with the slave control unit and the controller unit, and is suitable for converting the low-voltage auxiliary power supply voltage into the voltage required by the slave control unit and the controller unit;
The signal feedback module is respectively connected with the voltage input end of the power distribution module and the controller unit in a signal way, and the signal feedback unit is suitable for collecting state information of the voltage input end of the power distribution module and feeding back the state information to the controller unit;
The controller unit is in signal connection with the power distribution module and is suitable for controlling the power distribution module to work according to the state information of the voltage input end of the power distribution module.
Further, the voltage input end of the power distribution module is formed by connecting a low-voltage auxiliary power supply branch and an ignition switch branch in parallel.
Further, in order to prevent the circuit from being damaged due to reverse connection of the input power supply, a diode D1 is connected to the low-voltage auxiliary power supply branch, and the ignition switch branch comprises an ignition switch K1 and a diode D2 which are connected in series.
The specific circuit structure of the power distribution module is further provided, and the power distribution module comprises two MOS tubes, a plurality of diodes and a plurality of resistors; wherein,
The voltage input end of the power distribution module is connected with the sources of the two MOS tubes respectively;
The gate electrode driving circuit of the MOS tube Q2 consists of a resistor R3, a resistor R4 and a resistor R5; the output end of the ignition switch K1 is connected with a diode D3, the output end CPU_IO1 of the controller unit is connected with a diode D4 to form an OR logic gate circuit, and the OR logic gate circuit is used as the input end of a gate electrode driving circuit of the MOS tube Q2, so that the on-off state of the MOS tube is controlled by the controller unit;
The gate electrode driving circuit of the MOS tube Q4 consists of a resistor R6, a resistor R7 and a resistor R8, and the output end CPU_IO2 of the controller unit is used as the input end of the gate electrode driving circuit of the MOS tube Q4, so that the on-off state of the MOS tube Q4 is controlled by the controller unit;
the drains of the two MOS tubes are used as voltage output ends of the power supply distribution module and are respectively connected with voltage input ends of the linear voltage stabilizing module.
The specific circuit structure of the signal feedback module is further provided, and the signal feedback module comprises a triode, two comparators and a plurality of resistors; wherein,
The output end CPU_INT1 of the comparator U1 is connected with the external interrupt input end of the controller unit, the non-inverting input end of the comparator U1 is connected with the reference voltage Vref1, the inverting input end of the comparator U1 is connected with the output end of the low-voltage auxiliary power supply, the comparator U1 is suitable for monitoring whether the low-voltage auxiliary power supply is under-voltage or not, and an interrupt trigger signal CPU_INT1 is generated when the low-voltage auxiliary power supply is under-voltage to inform the controller unit to timely process the interrupt event;
The output end CPU_INT2 of the comparator U2 is connected to the external interrupt input end of the controller unit, the inverting input end of the comparator U2 is connected to the reference voltage Vref2, the non-inverting input end of the comparator U2 is connected to the output end of the ignition switch K1, the comparator U2 is suitable for monitoring whether the ignition switch K1 is turned off or not, and an interrupt trigger signal CPU_INT2 is generated when the ignition switch K1 is turned off to inform the controller unit to timely process the interrupt event;
The emitter of the triode Q1 is connected to the signal ground, the base of the triode Q1 is connected to the output end of the ignition switch K1 through a resistor R2, the collector of the triode Q1 is connected to a power supply 5V_M of the controller unit through a pull-up resistor R1, the collector of the triode Q1 is used as an output end CPU_INT3 to be connected to an external interrupt input end of the controller unit, the triode Q1 is suitable for monitoring whether the ignition switch K1 is closed or not, and an interrupt trigger signal CPU_INT3 is generated when the triode Q1 is closed to inform the controller unit to timely process an interrupt event.
The specific circuit structure of the linear voltage stabilizing module is further provided, and the linear voltage stabilizing module comprises two linear conversion chips; wherein,
The output end 12V_M of the power distribution module is connected to the input end of the linear conversion chip U3, the output end 5V_MCU of the linear conversion chip U3 is connected to the power input end of the controller unit, and the linear conversion chip U3 is suitable for supplying power to the controller unit;
The output end 12V_S of the power distribution module is connected to the input end of the linear conversion chip U4, the output end 5V_SLAVE of the linear conversion chip U4 is connected to the power input end of the slave control unit, and the linear conversion chip U4 is suitable for supplying power to the slave control unit.
Further to improve transient response capability of the input and output of the two linear conversion chips, the input and output of each linear conversion chip is grounded through a decoupling capacitor.
In order to further ensure that the voltage of the output end of the linear conversion chip can be reset to zero in time in the power-down process, the problem that the power-down of the output end of the linear conversion chip is slow to cause feeding is prevented, and the input end of each linear conversion chip is connected with the output end of each linear conversion chip after being reversely connected with a diode.
After the technical scheme is adopted, the power supply distribution module distributes the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module under the control of the controller unit, and the linear voltage stabilizing module converts the low-voltage auxiliary power supply voltage into the voltage required by the slave control unit and the controller unit; the signal feedback module collects the state information of the voltage input end of the power distribution module and feeds back the state information to the controller unit, and the controller unit controls the power distribution module to work according to the received state signal, the invention is suitable for the power supply design of the low-voltage storage battery auxiliary power supply in the automobile, and compared with the existing low-voltage auxiliary power supply application circuit, the invention has the low power consumption management function, effectively improves the use efficiency of the low-voltage storage battery under the actual working condition, and greatly reduces the heat loss of the linear voltage stabilizing device, thereby preventing the linear voltage stabilizing device from being permanently damaged due to continuous working under the over-temperature condition and improving the working reliability of the circuit. Meanwhile, the invention adopts a simple discrete circuit design, effectively solves the problems of increasing difficulty in model selection, increasing cost and the like due to the use of a specific power supply chip, and realizes safe power-on control and low-power consumption management of a power supply load circuit through control and management of a power supply sequence of a power supply.
Drawings
FIG. 1 is a schematic block diagram of an on-board low voltage auxiliary power supply circuit of the present invention;
FIG. 2 is a circuit diagram of an on-board low voltage auxiliary power supply circuit of the present invention;
fig. 3 is a timing chart of the operation of the vehicle-mounted low-voltage auxiliary power circuit of the present invention.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1 and 2, an on-vehicle low-voltage auxiliary power circuit comprises a low-voltage auxiliary power supply, a power distribution module, a linear voltage stabilizing module, a signal feedback module, a controller unit and a slave control unit; wherein,
The power distribution module is respectively and electrically connected with the low-voltage auxiliary power supply and the linear voltage stabilizing module, and is suitable for distributing the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module;
The linear voltage stabilizing module is respectively and electrically connected with the slave control unit and the controller unit, and is suitable for converting the low-voltage auxiliary power supply voltage into the voltage required by the slave control unit and the controller unit;
The signal feedback module is respectively connected with the voltage input end of the power distribution module and the controller unit in a signal way, and the signal feedback unit is suitable for collecting state information of the voltage input end of the power distribution module and feeding back the state information to the controller unit;
The controller unit is in signal connection with the power distribution module and is suitable for controlling the power distribution module to work according to the state information of the voltage input end of the power distribution module. Wherein, the output voltage of the low-voltage auxiliary power supply is 12V. Specifically, the signal feedback unit is used for collecting state information of the voltage input end of the power distribution module, namely, state information of the low-voltage auxiliary power supply and the starting switch thereof.
As shown in fig. 2, the voltage input end of the power distribution module is formed by connecting a low-voltage auxiliary power supply branch and an ignition switch branch in parallel. In this embodiment, in order to prevent the input power from being reversely connected to damage the circuit, a diode D1 is connected to the low-voltage auxiliary power branch, and the ignition switch branch includes an ignition switch K1 and a diode D2 connected in series with each other. The ignition switch K1 is the starting switch of the low-voltage auxiliary power supply.
As shown in fig. 2, the power distribution module includes two MOS transistors, a plurality of diodes, and a plurality of resistors; wherein,
The voltage input end of the power distribution module is connected with the sources of the two MOS tubes respectively;
The gate electrode driving circuit of the MOS tube Q2 consists of a resistor R3, a resistor R4 and a resistor R5; the output end of the ignition switch K1 is connected with a diode D3, the output end CPU_IO1 of the controller unit is connected with a diode D4 to form an OR logic gate circuit, and the OR logic gate circuit is used as the input end of a gate electrode driving circuit of the MOS tube Q2, so that the on-off state of the MOS tube is controlled by the controller unit;
The gate electrode driving circuit of the MOS tube Q4 consists of a resistor R6, a resistor R7 and a resistor R8, and the output end CPU_IO2 of the controller unit is used as the input end of the gate electrode driving circuit of the MOS tube Q4, so that the on-off state of the MOS tube Q4 is controlled by the controller unit;
the drains of the two MOS tubes are used as voltage output ends of the power supply distribution module and are respectively connected with voltage input ends of the linear voltage stabilizing module. In this embodiment, the MOS transistor is an enhanced P-channel MOS transistor.
As shown in fig. 2, the signal feedback module includes a triode, two comparators and a plurality of resistors; wherein,
The output end CPU_INT1 of the comparator U1 is connected to the external interrupt input end of the controller unit, the non-inverting input end of the comparator U1 is connected to the reference voltage Vref1, the inverting input end of the comparator U1 is connected to the output end of the low-voltage auxiliary power supply, the comparator U1 is suitable for monitoring whether the low-voltage auxiliary power supply is under-voltage or not, and an interrupt trigger signal CPU_INT1 is generated when the low-voltage auxiliary power supply is under-voltage to inform the controller unit to timely process the interrupt event, and in particular, the threshold value for triggering the interrupt is adjusted by setting the reference voltage Vref 1;
The output end CPU_INT2 of the comparator U2 is connected to the external interrupt input end of the controller unit, the inverting input end of the comparator U2 is connected to the reference voltage Vref2, the non-inverting input end of the comparator U2 is connected to the output end of the ignition switch K1, the comparator U2 is suitable for monitoring whether the ignition switch K1 is turned off or not, and an interrupt trigger signal CPU_INT2 is generated when the ignition switch K1 is turned off to inform the controller unit to timely process the interrupt event, and in particular, the threshold value for triggering the interrupt is adjusted by setting the reference voltage Vref 2;
The emitter of the triode Q1 is connected to the signal ground, the base of the triode Q1 is connected to the output end of the ignition switch K1 through a resistor R2, the collector of the triode Q1 is connected to a power supply 5V_M of the controller unit through a pull-up resistor R1, the collector of the triode Q1 is used as an output end CPU_INT3 to be connected to an external interrupt input end of the controller unit, the triode Q1 is suitable for monitoring whether the ignition switch K1 is closed or not, and an interrupt trigger signal CPU_INT3 is generated when the triode Q1 is closed to inform the controller unit to timely process an interrupt event.
As shown in fig. 2, the linear voltage stabilizing module includes two linear conversion chips; wherein,
The output end 12V_M of the power distribution module is connected to the input end of the linear conversion chip U3, the output end 5V_MCU of the linear conversion chip U3 is connected to the power input end of the controller unit, and the linear conversion chip U3 is suitable for supplying power to the controller unit;
The output end 12V_S of the power distribution module is connected to the input end of the linear conversion chip U4, the output end 5V_SLAVE of the linear conversion chip U4 is connected to the power input end of the slave control unit, and the linear conversion chip U4 is suitable for supplying power to the slave control unit.
As shown in fig. 2, in order to improve transient response capability of the input and output terminals of two linear conversion chips, the input and output terminals of each linear conversion chip are grounded through a decoupling capacitor, respectively. In this embodiment, the input end of the linear conversion chip U3 is grounded through the decoupling capacitor C1, the output end of the linear conversion chip U3 is grounded through the decoupling capacitor C2, the input end of the linear conversion chip U4 is grounded through the decoupling capacitor C3, and the output end of the linear conversion chip U4 is grounded through the decoupling capacitor C4.
As shown in fig. 2, in order to ensure that the voltage of the output end of the linear conversion chip returns to zero in time in the power-down process, the problem that the power-down of the output end of the linear conversion chip is slow to cause feeding is prevented, and the input end of each linear conversion chip is reversely connected with the output end of the diode. In this embodiment, the input end of the linear conversion chip U3 is connected to the output end of the linear conversion chip U3 after being reversely connected to the schottky diode D5; the input end of the linear conversion chip U4 is connected with the output end of the linear conversion chip U4 after being reversely connected with the Schottky diode D6.
To better illustrate the operation of the power circuit of the present invention, the following describes the operation of the power circuit with reference to fig. 3, and the operation of the whole power circuit may be divided into the following sections:
S0 interval: the power supply circuit is in an initial state, the output voltage of the low-voltage auxiliary power supply 12V_AUX is 12V, the ignition switch K1 is in an off state, the voltage of the output end of the ignition switch K1 is zero, the output signals CPU_IO1 and CPU_IO2 of the controller unit are all in low level, the interrupt trigger signals CPU_INT1 and CPU_INT3 are in high level, the interrupt trigger signal CPU_INT2 is in low level, the MOS tube Q2 and the MOS tube Q4 are in an off state, and the output voltages of the power supply circuit are all in zero.
S1 section: the power circuit is in a primary starting state, the output voltage of the low-voltage auxiliary power supply 12V_AUX is 12V, the ignition switch K1 is in a closed state for the first time, the voltage of the output end of the ignition switch K1 is 12V, the output signals CPU_IO1 and CPU_IO2 of the controller unit are low level, the interrupt trigger signals CPU_INT1 and CPU_INT2 are high level, the interrupt trigger signal CPU_INT3 is low level, the signal of the output end of the ignition switch K1 is switched on by the low-to-high trigger diode D3 and the triode Q3 for the first time, the MOS transistor Q2 is enabled to be in a conducting state, the voltage of the output end 5V_M of the power circuit is 5V, and the controller unit starts to be electrified; however, the MOS transistor Q4 is still in the off state, and the voltage at the output terminal 5v_s of the power supply circuit is still zero.
S2 section: the power supply circuit is in a normal running state, the output voltage of the low-voltage auxiliary power supply 12V_AUX is 12V, the ignition switch K1 is in a closed state, the voltage output of the power supply output end 5V_M is normal, the controller unit starts to execute a power-on initialization process, an external interrupt trigger mode is set to be a low-level trigger mode after the external interrupt initialization setting is completed, and an external interrupt response function is enabled to be realized, at the moment, the controller unit responds to the interrupt trigger signal CPU_INT3 because an interrupt trigger signal CPU_INT3 input by the external interrupt is a low-level signal, the output end CPU_IO2 of the controller unit is set to be high level in an interrupt service program, the trigger transistor Q5 is turned on, the MOS transistor Q4 is further turned on, the power supply circuit output end 5V_S is 5V, and the whole system starts to normally run after the power-on initialization of the controller unit and the slave unit is completed.
S3 section: the power supply circuit is in a low power consumption state, the output voltage of the low-voltage auxiliary power supply 12V_AUX is 12V, the ignition switch K1 is in an off state, the voltage of the output end of the ignition switch K1 is zero, the interrupt trigger signal CPU_INT2 starts to be changed from high to low, the controller unit is influenced by the trigger of the external interrupt trigger signal CPU_INT2 in the normal operation process, the controller unit enters a corresponding interrupt service routine, the output end CPU_IO1 is set to be high level firstly, and the MOS tube Q2 is ensured to be still in a conducting state after the output signal of the ignition switch K1 is reset, namely the controller unit is still electrified; setting the output end CPU_IO2 to be low level, so that the triode Q5 and the MOS tube Q4 are in a cut-off state, and resetting the voltage of the output end 5V_S of the power circuit to zero, namely starting to power down other slave control units; then, the main controller executes the sleep instruction to enter a low power consumption state.
S4 section: the power supply circuit is in an awake state, the output voltage of the low-voltage auxiliary power supply 12V_AUX is 12V, the ignition switch K1 is in a closed state again, the voltage of the output end of the ignition switch K1 is 12V, the interrupt trigger signal CPU_INT3 starts to be changed from high to low, the controller unit is influenced by the trigger of the external interrupt trigger signal CPU_INT3 in the low-power sleep process, the controller unit starts to be awakened to normally operate and enters a corresponding interrupt service routine, the output end CPU_IO2 of the controller unit is reset to be high level, the trigger transistor Q5 and the MOS transistor Q4 are conducted again, the voltage of the output end 5V_S of the power supply circuit is recovered to 5V, namely other slave control units are electrified again, and the whole system restarts to normally operate.
S5 section: the power circuit is in a power-down state, when the output voltage of the low-voltage auxiliary power supply 12V_AUX is lower than 8V in an actual working condition, an external interrupt trigger signal CPU_INT1 signal is changed from high to low, and if the controller unit is in a normal running state, the controller unit enters a corresponding interrupt service program under the influence of interrupt trigger, the output end CPU_IO1 of the controller unit is set to be low level, and a driver is reminded of stopping the vehicle in time and turning off an ignition switch due to the occurrence of a low-voltage auxiliary power supply under-voltage event; if the controller unit is in a low-power-consumption sleep state, the controller unit wakes up under the influence of interrupt trigger and enters a corresponding interrupt service program, and meanwhile, the output end CPU_IO1 of the controller unit is set to be at a low level; at this time, the transistor Q3 and the MOS transistor Q2 are turned off, the voltage at the output terminal 5v_m of the power circuit returns to zero, and the whole system is in a power-down state.
The working principle of the invention is as follows:
The power supply distribution module distributes the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module under the control of the controller unit, and the linear voltage stabilizing module converts the low-voltage auxiliary power supply voltage into the voltage required by the slave control unit and the controller unit; the signal feedback module collects the state information of the voltage input end of the power distribution module and feeds back the state information to the controller unit, and the controller unit controls the power distribution module to work according to the received state signal, the invention is suitable for the power supply design of the low-voltage storage battery auxiliary power supply in the automobile, and compared with the existing low-voltage auxiliary power supply application circuit, the invention has the low power consumption management function, effectively improves the use efficiency of the low-voltage storage battery under the actual working condition, and greatly reduces the heat loss of the linear voltage stabilizing device, thereby preventing the linear voltage stabilizing device from being permanently damaged due to continuous working under the over-temperature condition and improving the working reliability of the circuit. Meanwhile, the invention adopts a simple discrete circuit design, effectively solves the problems of increasing difficulty in model selection, increasing cost and the like due to the use of a specific power supply chip, and realizes safe power-on control and low-power consumption management of a power supply load circuit through control and management of a power supply sequence of a power supply.
The technical problems, technical solutions and advantageous effects solved by the present invention have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
Claims (1)
1. An on-vehicle low pressure auxiliary power supply circuit which characterized in that: the power supply system comprises a low-voltage auxiliary power supply, a power supply distribution module, a linear voltage stabilizing module, a signal feedback module, a controller unit and a slave control unit; wherein,
The power distribution module is respectively and electrically connected with the low-voltage auxiliary power supply and the linear voltage stabilizing module, and is suitable for distributing the low-voltage auxiliary power supply voltage to the linear voltage stabilizing module;
The linear voltage stabilizing module is respectively and electrically connected with the slave control unit and the controller unit, and is suitable for converting the low-voltage auxiliary power supply voltage into the voltage required by the slave control unit and the controller unit;
The signal feedback module is respectively connected with the voltage input end of the power distribution module and the controller unit in a signal way, and is suitable for collecting state information of the voltage input end of the power distribution module and feeding back the state information to the controller unit;
The controller unit is in signal connection with the power distribution module and is suitable for controlling the power distribution module to work according to the state information of the voltage input end of the power distribution module;
The voltage input end of the power distribution module is formed by connecting a low-voltage auxiliary power supply branch and an ignition switch branch in parallel;
the low-voltage auxiliary power supply branch is connected with a diode D1, and the ignition switch branch comprises an ignition switch K1 and a diode D2 which are mutually connected in series;
the signal feedback module comprises a triode, two comparators and a plurality of resistors; wherein,
The output end CPU_INT1 of the comparator U1 is connected with the external interrupt input end of the controller unit, the non-inverting input end of the comparator U1 is connected with the reference voltage Vref1, the inverting input end of the comparator U1 is connected with the output end of the low-voltage auxiliary power supply, the comparator U1 is suitable for monitoring whether the low-voltage auxiliary power supply is under-voltage or not, and an interrupt trigger signal CPU_INT1 is generated when the low-voltage auxiliary power supply is under-voltage to inform the controller unit to timely process the interrupt event;
The output end CPU_INT2 of the comparator U2 is connected to the external interrupt input end of the controller unit, the inverting input end of the comparator U2 is connected to the reference voltage Vref2, the non-inverting input end of the comparator U2 is connected to the output end of the ignition switch K1, the comparator U2 is suitable for monitoring whether the ignition switch K1 is turned off or not, and an interrupt trigger signal CPU_INT2 is generated when the ignition switch K1 is turned off to inform the controller unit to timely process the interrupt event;
The emitter of the triode Q1 is connected to the signal ground, the base of the triode Q1 is connected to the output end of the ignition switch K1 through a resistor R2, the collector of the triode Q1 is connected to a power supply 5V_M of the controller unit through a pull-up resistor R1, the collector of the triode Q1 is used as an output end CPU_INT3 to be connected to an external interrupt input end of the controller unit, the triode Q1 is suitable for monitoring whether the ignition switch K1 is closed or not, and an interrupt trigger signal CPU_INT3 is generated when the ignition switch K1 is closed to inform the controller unit to timely process an interrupt event;
The power distribution module comprises two MOS tubes, a plurality of diodes and a plurality of resistors; wherein,
The voltage input end of the power distribution module is connected with the sources of the two MOS tubes respectively;
The gate electrode driving circuit of the MOS tube Q2 consists of a resistor R3, a resistor R4 and a resistor R5; the output end of the ignition switch K1 is connected with a diode D3, the output end CPU_IO1 of the controller unit is connected with a diode D4 to form an OR logic gate circuit, and the OR logic gate circuit is used as the input end of a gate electrode driving circuit of the MOS tube Q2, so that the on-off state of the MOS tube is controlled by the controller unit;
The gate electrode driving circuit of the MOS tube Q4 consists of a resistor R6, a resistor R7 and a resistor R8, and the output end CPU_IO2 of the controller unit is used as the input end of the gate electrode driving circuit of the MOS tube Q4, so that the on-off state of the MOS tube Q4 is controlled by the controller unit;
The drains of the two MOS tubes are used as voltage output ends of the power supply distribution module and are respectively connected with voltage input ends of the linear voltage stabilizing module;
the linear voltage stabilizing module comprises two linear conversion chips; wherein,
The output end 12V_M of the power distribution module is connected to the input end of the linear conversion chip U3, the output end 5V_MCU of the linear conversion chip U3 is connected to the power input end of the controller unit, and the linear conversion chip U3 is suitable for supplying power to the controller unit;
The output end 12V_S of the power distribution module is connected to the input end of the linear conversion chip U4, the output end 5V_SLAVE of the linear conversion chip U4 is connected to the power input end of the slave control unit, and the linear conversion chip U4 is suitable for supplying power to the slave control unit;
The input end and the output end of each linear conversion chip are grounded through a decoupling capacitor respectively;
the input end of each linear conversion chip is reversely connected with the diode and then connected with the output end of the linear conversion chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243262.3A CN109861521B (en) | 2019-03-28 | 2019-03-28 | Vehicle-mounted low-voltage auxiliary power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243262.3A CN109861521B (en) | 2019-03-28 | 2019-03-28 | Vehicle-mounted low-voltage auxiliary power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109861521A CN109861521A (en) | 2019-06-07 |
| CN109861521B true CN109861521B (en) | 2024-08-27 |
Family
ID=66902406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910243262.3A Active CN109861521B (en) | 2019-03-28 | 2019-03-28 | Vehicle-mounted low-voltage auxiliary power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109861521B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336456B (en) * | 2019-07-16 | 2021-02-19 | 赵红雁 | Awakening drive circuit of low-voltage power supply of electric automobile |
| CN110703844B (en) * | 2019-10-15 | 2024-10-18 | 力创科技股份有限公司 | Power path management circuit |
| CN112087034B (en) * | 2020-09-14 | 2022-06-14 | 广东高标电子科技有限公司 | Electric vehicle power-on and power-off control method and circuit and electric vehicle |
| CN113147633B (en) * | 2021-04-13 | 2023-03-31 | 联合汽车电子有限公司 | Power distribution module and automobile body controller |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171401A (en) * | 2017-07-04 | 2017-09-15 | 东莞市巨星电池有限公司 | A kind of pair of accessory power supply and the energy-storage system based on double accessory power supplys |
| CN209526656U (en) * | 2019-03-28 | 2019-10-22 | 常州索维尔电子科技有限公司 | Vehicle-mounted low pressure auxiliary power circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834826B (en) * | 2017-11-01 | 2020-04-24 | 中国航空无线电电子研究所 | Power supply control module |
| CN108964245B (en) * | 2018-07-05 | 2024-09-10 | 青岛乾程科技股份有限公司 | Power supply detection and switching device for electric energy meter |
-
2019
- 2019-03-28 CN CN201910243262.3A patent/CN109861521B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171401A (en) * | 2017-07-04 | 2017-09-15 | 东莞市巨星电池有限公司 | A kind of pair of accessory power supply and the energy-storage system based on double accessory power supplys |
| CN209526656U (en) * | 2019-03-28 | 2019-10-22 | 常州索维尔电子科技有限公司 | Vehicle-mounted low pressure auxiliary power circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109861521A (en) | 2019-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109861521B (en) | Vehicle-mounted low-voltage auxiliary power supply circuit | |
| CN108288735B (en) | Power source wake-up control circuit of electric automobile | |
| CN104062928B (en) | Vehicle control unit of electric vehicle power circuit | |
| CN102214846A (en) | Method for reducing consumption of battery management system and low-consumption battery management system | |
| CN210053236U (en) | Low-loss reverse connection prevention power-on system | |
| CN209765306U (en) | vehicle control unit and vehicle | |
| CN204659637U (en) | Based on the car load CAN wake-up circuit of TJA1041AT interface chip | |
| CN101420131B (en) | Energy saving control method for lithium ionic battery protection circuit and control circuit thereof | |
| CN103760798B (en) | A kind of solar energy storage intelligent management system | |
| CN205920369U (en) | Long electrified carbone controller power | |
| CN108508868B (en) | Ignition signal awakening circuit of motor controller and control method | |
| CN209526656U (en) | Vehicle-mounted low pressure auxiliary power circuit | |
| CN203732919U (en) | Solar energy storage intelligent management system | |
| US20210365101A1 (en) | Control system for controlling intelligent system to reduce power consumption based on bluetooth device | |
| CN211374995U (en) | Awakening circuit of power battery module voltage sampling system | |
| CN206323170U (en) | A kind of intelligent power supply circuit for car-mounted terminal | |
| CN212343310U (en) | Protective device for vehicle-mounted electronic equipment and vehicle-mounted electronic equipment | |
| CN211456745U (en) | Low pressure BMS dormancy and awaken power supply control device up | |
| CN115865566B (en) | Gateway controller suitable for commercial car | |
| CN108656976A (en) | Battery management system | |
| CN212423032U (en) | Multiple protection circuit of vehicle control unit | |
| CN203186118U (en) | Automatic power-off controller | |
| CN202260496U (en) | System for realizing single chip microcomputer power supply management based on clock chip | |
| CN220692984U (en) | Wake-up circuit and vehicle | |
| CN219676230U (en) | Monomer monitoring devices with dormancy function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Applicant after: Changzhou Shiwei Electronics Co.,Ltd. Address before: 213300 building 19, No. 618, wharf West Street, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Applicant before: CHANGZHOU SOARWHALE ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region before: China |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |