CN112531647B - Linear voltage-stabilized power supply circuit applied to automobile electronic controller - Google Patents

Linear voltage-stabilized power supply circuit applied to automobile electronic controller Download PDF

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Publication number
CN112531647B
CN112531647B CN202011454995.0A CN202011454995A CN112531647B CN 112531647 B CN112531647 B CN 112531647B CN 202011454995 A CN202011454995 A CN 202011454995A CN 112531647 B CN112531647 B CN 112531647B
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circuit
voltage
output
power supply
transistor
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CN112531647A (en
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彭金城
方利志
蒋继东
何葵
蔡丹丹
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The application relates to a linear voltage-stabilized power supply circuit applied to an automobile electronic controller, which comprises a level conversion circuit, a controlled power supply circuit, a voltage adjusting circuit, a current-limiting protection circuit, an output reverse protection circuit, an output voltage feedback circuit, a programmable precise voltage reference circuit, an output detection circuit and a control circuit, wherein the voltage adjusting circuit is used for adjusting the output voltage of the controlled power supply circuit and then outputting a voltage signal C; the current-limiting protection circuit is used for outputting a voltage signal D after current-limiting protection is carried out on the output current of the voltage regulating circuit; the output reverse protection circuit is used for outputting a power supply VCC after reverse protection; the output detection circuit is used for detecting the output voltage of the output reverse protection circuit and outputting a voltage signal VSense; the control circuit is used for controlling the output power VCC according to the voltage signal C and the voltage signal D. The linear voltage-stabilized power supply circuit can meet the test requirement of power output 'connection network anode performance'.

Description

Linear voltage-stabilized power supply circuit applied to automobile electronic controller
Technical Field
The application relates to the technical field of linear voltage-stabilized power supplies, in particular to a linear voltage-stabilized power supply circuit applied to an automobile electronic controller.
Background
The voltage-stabilized power supply circuit is widely applied to an automobile electronic controller and can be divided into a linear voltage-stabilized circuit and a switch voltage-stabilized circuit according to the working mode of a regulating tube of the voltage-stabilized power supply circuit. The linear voltage stabilizing circuit is characterized in that: the output voltage is lower than the input voltage, the reaction speed is high, the output ripple wave is small, the working noise is low, the efficiency is low, and the cost is low; the switch voltage stabilizing circuit is characterized in that: the circuit has the advantages of high efficiency, light weight, wide voltage stabilizing range, serious switch interference, low response speed, instantaneous overvoltage or undervoltage peak, complex circuit structure, large influence of the input voltage, the load weight and the device parameter drift on the quality of output voltage, high failure rate and high cost. For an electronic controller of an automobile, a linear voltage stabilizing circuit is preferably used for a power supply, mainly because of low noise and low cost, but for a power supply requiring a larger current, a switching voltage stabilizing circuit is generally adopted in order to improve efficiency and reduce heat generation.
Various linear voltage-stabilizing integrated circuits and switching voltage-stabilizing integrated circuits are available on the market, and the linear voltage-stabilizing integrated circuits and the switching voltage-stabilizing integrated circuits can be easily designed, but the integrated circuits have some defects in performance and higher cost while being convenient to use, and the cost is very important for mass-produced products.
Referring to fig. 1, a conventional linear voltage regulator circuit usually employs an integrated circuit, which includes a linear voltage regulator chip, where an input voltage Vin of the linear voltage regulator chip is 4.5-45V, an output voltage Vout is 3.3V or 5V, a peripheral circuit has only 2 capacitors, which are respectively denoted as Cin and Cout, Cin is 100nF, when Vout is 3.3V, Cout is 22uF, and when Vout is 5V, Cout is 10 uF.
However, the linear voltage-stabilized power supply circuit has a simple structure, and when the linear voltage-stabilized power supply circuit is applied to an external power supply of an automobile electronic controller, the test requirement of power output 'network connection anode performance' cannot be met.
Disclosure of Invention
The embodiment of the application provides a linear voltage-stabilized power supply circuit applied to an automobile electronic controller, and aims to solve the technical problem that the test requirement of the positive pole performance of a connection network of power output cannot be met in the related technology.
In a first aspect, a linear voltage-stabilized power supply circuit applied to an electronic controller of an automobile is provided, which includes:
a level shift circuit for performing level shift on an input signal EN;
the controlled power supply circuit is connected with the level conversion circuit and the voltage source BAT +, and is used for correspondingly outputting different levels according to the output level of the level conversion circuit;
the voltage adjusting circuit is connected with the controlled power supply circuit and is used for adjusting the output voltage of the controlled power supply circuit and outputting a voltage signal C;
the current-limiting protection circuit is connected with the voltage regulating circuit and is used for outputting a voltage signal D after current-limiting protection is carried out on the output current of the voltage regulating circuit;
the output reverse protection circuit is connected with the current-limiting protection circuit and is used for outputting a power supply VCC after reverse protection;
the input end of the output voltage feedback circuit is connected with the output end of the output reverse protection circuit and is used for providing feedback voltage according to the output voltage of the output reverse protection circuit;
the input end of the programmable precision voltage reference circuit is connected with the output end of the output voltage feedback circuit, the output end of the programmable precision voltage reference circuit is connected with the output end of the controlled power supply circuit, and the programmable precision voltage reference circuit is used for correspondingly adjusting the input of the voltage adjusting circuit according to the feedback voltage;
the output detection circuit is connected with the output reverse protection circuit and is used for detecting the output voltage of the output reverse protection circuit and outputting a voltage signal VSense;
and the control circuit is connected with the output end of the voltage adjusting circuit, the output end of the current-limiting protection circuit, the output end of the output detection circuit and the input signal EN, and is used for controlling the output power VCC according to the voltage signal C and the voltage signal D.
In some embodiments, the linear voltage-stabilized power supply circuit applied to the automotive electronic controller further includes a power protection circuit, which is disposed between the voltage source BAT + and the controlled power supply circuit, and is used for protecting the voltage source BAT +.
In some embodiments, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises a high-frequency negative feedback circuit which is connected with both the current-limiting protection circuit and the programmable precision voltage reference circuit and is used for suppressing high-frequency interference.
In some embodiments, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further includes an output filter circuit connected to the output end of the output reverse protection circuit, and configured to filter the power VCC output by the output direction protection circuit.
In some embodiments, the voltage regulation circuit comprises a transistor Q1 and a resistor R13, the base of the transistor Q1 is connected to the controlled power supply circuit through the resistor R13, the collector of the transistor Q1 is connected to the voltage source BAT +, and the emitter of the transistor Q1 outputs the voltage signal C.
In some embodiments, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises a temperature detection circuit, the temperature detection circuit comprises a thermistor R3, the thermistor R3 is arranged in cooperation with the transistor Q1, the temperature detection circuit is used for detecting the temperature of the transistor Q1 and outputting a corresponding voltage VTemp according to the detected temperature, and an output end of the temperature detection circuit is connected with the control circuit.
In some embodiments, the level shifter circuit includes a transistor Q4, the base of the transistor Q4 is coupled to the input signal EN, the collector of the transistor Q4 is coupled to the controlled power supply circuit, and the emitter of the transistor Q4 is coupled to ground.
In some embodiments, the controlled power supply circuit includes a transistor Q3, a resistor R9, a resistor R12 and a resistor R15, an emitter of the transistor Q3 is connected to the voltage source BAT + through a resistor R9, a resistor R12 is connected across a base and an emitter of the transistor Q3, a base of the transistor Q3 is connected to the level shift circuit through a resistor R15, and a collector of the transistor Q3 outputs the voltage signal B.
In some embodiments, the current limiting protection circuit comprises a transistor Q2 and a resistor R8, a base of the transistor Q2 is connected to the output terminal of the voltage regulation circuit, the resistor R8 is connected across a base and an emitter of the transistor Q2, a collector of the transistor Q2 is connected to the input terminal of the voltage regulation circuit, and an emitter of the transistor Q2 outputs the voltage signal D.
In some embodiments, the output reverse protection circuit includes a diode D1, an anode of the diode D1 is connected to the current limiting protection circuit, and a cathode of the diode D1 outputs a power source VCC.
The beneficial effect that technical scheme that this application provided brought includes: the test requirement of power output 'connection network anode performance' can be met, and the power supply can be used for power supply inside the PCB and cannot be damaged by external inductive loads when used for external power supply.
The embodiment of the application provides a linear voltage-stabilized power supply circuit applied to an automobile electronic controller, which comprises a level conversion circuit, a controlled power supply circuit, a voltage adjusting circuit, a current-limiting protection circuit, an output reverse protection circuit, an output voltage feedback circuit, a programmable precise voltage reference circuit, an output detection circuit and a control circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a prior art linear regulated power supply circuit;
FIG. 2 is a block diagram of a linear voltage-stabilized power supply circuit applied to an electronic controller of an automobile according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a linear voltage-stabilized power supply circuit applied to an electronic controller of an automobile according to an embodiment of the present application.
In the figure, 1, a power supply protection circuit; 2. a level conversion circuit; 3. a controlled power supply circuit; 4. a programmable precision voltage reference circuit; 5. a voltage regulation circuit; 6. a current limiting protection circuit; 7. a high frequency negative feedback circuit; 8. an output reverse protection circuit; 9. an output voltage feedback circuit; 10. an output filter circuit; 11. an output detection circuit; 12. a temperature detection circuit; 13. a control circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2 and 3, an embodiment of the present application provides a linear voltage-stabilized power supply circuit applied to an electronic controller of an automobile, which includes a level conversion circuit 2, a controlled power supply circuit 3, a voltage regulation circuit 5, a current-limiting protection circuit 6, an output reverse protection circuit 8, an output voltage feedback circuit 9, a programmable precision voltage reference circuit 4, an output detection circuit 11, and a control circuit 13.
The level conversion circuit 2 is used for performing level conversion on the input signal EN; the controlled power supply circuit 3 is connected with the level conversion circuit 2 and the voltage source BAT +, and is used for correspondingly outputting different levels according to the output level of the level conversion circuit 2; the voltage adjusting circuit 5 is connected with the controlled power supply circuit 3 and is used for adjusting the output voltage of the controlled power supply circuit 3 and outputting a voltage signal C; the current-limiting protection circuit 6 is connected with the voltage regulating circuit 5 and is used for outputting a voltage signal D after current-limiting protection is carried out on the output current of the voltage regulating circuit 5; the output reverse protection circuit 8 is connected with the current-limiting protection circuit 6 and is used for outputting a power supply VCC after reverse protection; the input end of the output voltage feedback circuit 9 is connected with the output end of the output reverse protection circuit 8, and is used for providing feedback voltage according to the output voltage of the output reverse protection circuit 8; the input end of the programmable precise voltage reference circuit 4 is connected with the output end of the output voltage feedback circuit 9, the output end of the programmable precise voltage reference circuit is connected with the output end of the controlled power supply circuit 3, and the programmable precise voltage reference circuit is used for correspondingly adjusting the input of the voltage adjusting circuit 5 according to the feedback voltage; the output detection circuit 11 is connected to the output reverse protection circuit 8, and is configured to detect an output voltage of the output reverse protection circuit 8 and output a voltage signal VSense; control circuit 13 with voltage regulator circuit 5's output, current-limiting protection circuit 6's output, output detection circuit 11's output, and input signal EN all links to each other, and it is used for according to voltage signal C, voltage signal D control output power VCC.
The working process of the linear voltage-stabilized power supply circuit applied to the automobile electronic controller in the embodiment of the application is as follows:
when the voltage source BAT + is 8-16V and the control circuit 13 controls the input signal EN to be at a high level, the power VCC outputs (5 +/-0.05) V, when the voltage source BAT + is 8-16V and the control circuit 13 controls the input signal EN to be at a low level, the power VCC outputs 0V, and when the output voltage VCC or the output current is abnormal, the control circuit 13 can turn off the power VCC within 5 us.
The linear voltage-stabilized power supply circuit applied to the automobile electronic controller comprises a level conversion circuit 2, a controlled power supply circuit 3, a voltage adjusting circuit 5, a current-limiting protection circuit 6, an output reverse protection circuit 8, an output voltage feedback circuit 9, a programmable precise voltage reference circuit 4, an output detection circuit 11 and a control circuit 13, and when the linear voltage-stabilized power supply circuit is applied to an external power supply of the automobile electronic controller, the test requirement of 'connection network positive performance' of power output can be met, the linear voltage-stabilized power supply circuit can also be used for internal power supply of a PCB, and the linear voltage-stabilized power supply circuit cannot be damaged by an external inductive load when used for external power supply.
Furthermore, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises a power supply protection circuit 1, which is arranged between the voltage source BAT + and the controlled power supply circuit 3 and is used for protecting the voltage source BAT +.
In the embodiment of the present application, power protection circuit 1 includes electric capacity C1, electric capacity C2, electric capacity C3 and diode D2, and electric capacity C1, electric capacity C2, electric capacity C3 and diode D2 are parallelly connected, electric capacity C1 one end links to each other with voltage source BAT +, and the other end ground connection, diode D2 is zener diode TVS, and it is used for preventing surge pulse, electric capacity C1 is the electric capacity of low frequency filtering and energy storage, and electric capacity C2 is the high frequency filter electric capacity, and electric capacity C3 is the electric capacity of preventing static and intermediate frequency filtering, through power protection circuit 1 can protect voltage source BAT +, protects human static, car power pulse, electromagnetism anti-interference etc. also plays the effect of power energy storage.
The linear voltage-stabilized power supply circuit applied to the automobile electronic controller in the embodiment of the application is provided with the power supply protection circuit, so that when the linear voltage-stabilized power supply circuit is used as a voltage-stabilized power supply of an automobile controller, the power supply input end can meet the test requirement of 'power supply reverse connection' without a series reverse connection prevention device, and the performance is better.
Furthermore, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises a high-frequency negative feedback circuit 7 which is connected with the current-limiting protection circuit 6 and the programmable precision voltage reference circuit 4 and is used for suppressing high-frequency interference.
In the embodiment of the application, the high-frequency negative feedback circuit 7 comprises a resistor R14 and a capacitor C6, wherein one end of the resistor R14 and one end of the capacitor C6 are connected in series and then connected with the current-limiting protection circuit 6, and the other end of the resistor R14 and the other end of the capacitor C6 are connected with the programmable precision voltage reference circuit 4. The capacitor C6 is a capacitor for determining the high frequency filtering frequency, and the resistor R14 is used for improving the output voltage ripple.
Furthermore, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises an output filter circuit 10 connected with the output end of the output reverse protection circuit 8, and used for filtering the power supply VCC output by the output direction protection circuit.
In the embodiment of the present application, the output filter circuit 10 includes a capacitor C4 and a capacitor C5, one end of the capacitor C4 is connected to the output power VCC after being connected in parallel with the capacitor C5, the other end of the capacitor C4 is grounded, the capacitor C5 is a capacitor for low-frequency filtering and energy storage, the capacitor C5 is a capacitor for static electricity prevention and medium-frequency filtering, and the filtering frequency range of the output filter circuit 10 is 1kHz to 20 MHz.
Specifically, the voltage adjusting circuit 5 includes a transistor Q1 and a resistor R13, a base of the transistor Q1 is connected to the controlled power supply circuit 3 through the resistor R13, a collector of the transistor Q1 is connected to the voltage source BAT +, and an emitter of the transistor Q1 outputs the voltage signal C.
In the embodiment of the present application, the transistor Q1 is an NPN transistor, which is a high-power regulating transistor for stabilizing the output voltage signal C, and when in use, the resistor R13 performs a voltage division function in a "power supply reverse connection test" to protect the transistor Q1 and the programmable precision voltage reference circuit 4.
Furthermore, the linear voltage-stabilized power supply circuit applied to the automobile electronic controller further comprises a temperature detection circuit 12, wherein the temperature detection circuit 12 comprises a thermistor R3, the thermistor R3 is matched with the transistor Q1, the temperature detection circuit is used for detecting the temperature of the transistor Q1 and outputting corresponding voltage VTemp according to the monitored temperature, and the output end of the temperature detection circuit is connected with the control circuit.
Specifically, the thermistor R3 is mounted near the TAB pad of the transistor Q1, the closer the better the electrical characteristics are secured, the output voltage VTemp is as a function of the temperature of the mounting position, and the thermistor R3 and the transistor Q1 are arranged in cooperation. The temperature detection circuit 12 further comprises a resistor R4, wherein one end of the resistor R4 is connected with the thermistor R3 in series and then is connected with a 3.3V power supply, the other end of the resistor R4 is grounded, the corresponding voltage VTemp is output from the connection point of the resistor R4 and the thermistor R3, and the resistor R4 performs voltage division.
In the embodiment of the present application, due to the temperature detection circuit 12, when the circuit temperature is abnormal, the temperature of the transistor Q1 will rise, the voltage VTemp will also change, the control circuit 13 can control the turn-off of the power VCC according to the voltage VTemp, and when the circuit temperature is abnormal, the control circuit 13 can turn off the power VCC within 5 ms.
Specifically, the level shift circuit 2 includes a transistor Q4, a base of the transistor Q4 is connected to the input signal EN, a collector of the transistor Q4 is connected to the controlled power supply circuit 3, and an emitter of the transistor Q4 is grounded.
Furthermore, the level shift circuit 2 further includes a capacitor C7, one end of the capacitor C7 is connected between the base of the transistor Q4 and the input signal EN, and the other end is grounded, the capacitor C7 is an input filter capacitor, and performs a filtering function on the input signal EN, the transistor Q4 is used for level shifting, and the collector of the transistor Q4 outputs the signal a. The transistor Q4 is integrated with an NPN transistor and two resistors. The base of the transistor Q4 is pin 1, the emitter of the transistor Q4 is pin 2, and the collector of the transistor Q4 is pin 3.
Specifically, the controlled power supply circuit 3 includes a transistor Q3, a resistor R9, a resistor R12 and a resistor R15, an emitter of the transistor Q3 is connected to a voltage source BAT + through a resistor R9, a resistor R12 is connected across a base and an emitter of the transistor Q3, a base of the transistor Q3 is connected to the level shift circuit 2 through a resistor R15, and a collector of the transistor Q3 outputs a voltage signal B.
Furthermore, the transistor Q3 is a PNP triode, the resistor R15 is a current-limiting resistor, which plays a role in limiting current, the transistor Q3 is a transistor used for switching control, the resistor R12 is bridged between the base and emitter of the transistor Q3, the resistor R12 is used for preventing the transistor Q3 from being turned on by mistake, which plays a role in shunting input, the resistor R12 also plays a role in voltage division in a "power reverse connection test", which protects the base and emitter of the transistor Q3, and the resistor R9 plays a role in dividing voltage and limiting current by input. The base of the transistor Q3 is pin 1, the emitter of the transistor Q3 is pin 2, and the collector of the transistor Q3 is pin 3.
Specifically, the current-limiting protection circuit 6 includes a transistor Q2 and a resistor R8, a base of the transistor Q2 is connected to the output terminal of the voltage adjustment circuit 5, the resistor R8 is connected across the base and the emitter of the transistor Q2, a collector of the transistor Q2 is connected to the input terminal of the voltage adjustment circuit 5, and an emitter of the transistor Q2 outputs the voltage signal D.
Further, in the embodiment of the present application, the transistor Q2 is an NPN transistor, the base of the transistor Q2 is connected to the emitter of the transistor Q1, and the collector of the transistor Q2 is connected to the collector of the transistor Q3. The base of the transistor Q2 is pin 1, the emitter of the transistor Q2 is pin 2, and the collector of the transistor Q3 is pin 3.
Specifically, the output reverse protection circuit 8 includes a diode D1, an anode of the diode D1 is connected to the current limiting protection circuit 6, and a cathode of the diode D1 outputs a power source VCC.
In the embodiment of the application, the diode D1 plays a role in blocking reverse voltage and bearing the reverse voltage, the diode D1 bears the reverse voltage which cannot be achieved at all in the connection network collection performance test, so that other devices are protected, and the diode D1 plays a role in voltage division in the power supply reverse connection test, so that other devices are protected.
Specifically, the output voltage feedback circuit 9 includes a resistor R11 and a resistor R17, after the resistor R11 and the resistor R17 are connected in series, one end of the resistor R is connected to the output power VCC of the output reverse protection circuit 8, the other end of the resistor R is grounded, a connection point of the resistor R11 and the resistor R17 is an output end of the output voltage feedback circuit 9, and a connection point of the resistor R11 and the resistor R17 is connected to the programmable precision voltage reference circuit 4.
Specifically, output detection circuit 11 includes resistance R10 and resistance R16, resistance R10 and resistance R16 connect in series the back one end and link to each other with output power VCC, and the other end ground connection, resistance R10 and resistance R16's tie point output voltage signal VSense, output voltage VSense and power VCC are linear proportional relation.
Specifically, the programmable precision voltage reference circuit 4 includes a power chip U1, the power chip U1 is a three-terminal programmable parallel zener diode generating precision voltage reference, the power chip U1 has three pins, the 1 st pin is connected to the output voltage feedback circuit 9, the 1 st pin outputs the voltage E, the 2 nd pin is connected to the voltage regulation circuit 5, and the 3 rd pin is grounded. In the embodiment of the present application, the power chip U1 may be SC431AVSNT 1G.
Specifically, the control circuit 13 includes a single chip microcomputer U2, a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R7, and a resistor R18, the single chip microcomputer has a pin VDD, a pin GND, a pin D0, a pin a _ CMP-, a pin a _ CMP +, a pin AI, a pin a _ Watchdog, and the like, the pin VDD is connected to a 3.3V power supply, the pin GND is grounded, the pin D0 is connected to an input signal EN through a resistor R18, the resistor R7 and the resistor R2 are connected in series, one end of the resistor R6 and the resistor R2 is connected to a voltage signal D, the other end of the resistor R7 and the resistor R2 are connected to a pin a _ CMP-, one end of the resistor R6 and the resistor R5 are connected in series is connected to a voltage signal C, the other end of the resistor R6 and the resistor R5 are connected to a pin a _ CMP +, the pin AI is connected to a voltage VTemp through a resistor R1, and the pin a _ watche is connected to a voltage signal VSense. Preferably, in the embodiment of the present application, the single chip microcomputer may be SPC 5747C.
In the embodiment of the present application, the pin a _ Watchdog has an analog upper and lower limit monitoring and over-limit interrupt function, the pin a _ CMP-and the pin a _ CMP + have analog comparison and interrupt functions, the pin D0 has a digital output function, and the pin AI has an analog detection function.
It should be noted that the transistor Q1, the transistor Q2, the transistor Q3, and the transistor Q4 in the embodiment of the present application may also be replaced by a field effect transistor, and the single chip microcomputer U2 may also be replaced by another controller, so as to implement the functions of the corresponding circuits, which is not limited herein.
The working principle of the linear voltage-stabilized power supply circuit applied to the automobile electronic controller in the embodiment of the application is as follows:
when the power supply VCC is required to be turned on, a pin D0 of the singlechip U2 outputs a high level, and the power supply VCC outputs 5V voltage; when the power supply VCC needs to be turned off, a pin D0 of the singlechip U2 outputs a low level, and the power supply VCC outputs 0V voltage;
when a power supply VCC is started, if a voltage signal VSense exceeds 4.85-5.15V set by a single chip microcomputer U2, an analog quantity over-limit watchdog is triggered to interrupt immediately, if the interrupt is triggered continuously for 3 times, a pin D0 of the single chip microcomputer U2 outputs low level, the power supply VCC is turned off, and the response time from the over-limit of the power supply VCC to the turning-off of the VCC power supply is 11 us;
when the power supply VCC is started, if the current ICD passing through the resistor R8 is larger than 300mA, analog comparison interruption is triggered immediately, if the interruption is triggered continuously for 3 times, the pin D0 of the singlechip U2 outputs low level to turn off the power supply VCC, and the response time from the current ICD being larger than the set value 300mA to the turn-off of the power supply VCC is 11 us;
when the power supply VCC is turned on, the single chip microcomputer U2 detects the voltage VTemp every 5ms, if the voltage VTemp detected for 3 times is larger than a set temperature voltage value, the set temperature voltage value is the voltage value of the VTemp corresponding to the transistor Q1 at 125 ℃, a pin D0 of the single chip microcomputer U2 outputs a low level, the power supply VCC is turned off, and the response time from the time that the voltage VTemp is larger than the set temperature voltage value to the time that the power supply VCC is turned off is 15 ms.
In this embodiment, the single chip microcomputer U2 of the control circuit 13 further includes a pin CANH and a pin CANL, and when the single chip microcomputer U2 detects that the power VCC is abnormal, the current ICD is abnormal, or the voltage VTemp is abnormal, the abnormal power VCC voltage value, the abnormal current ICD current value, or the temperature value corresponding to the abnormal voltage VTemp is recorded, and fault reporting is performed by the CAN bus through the pin CANH and the pin CANL, so that a fault alarm function is realized.
The linear voltage-stabilized power supply circuit applied to the automobile electronic controller meets the test requirement of power output 'connection network positive performance', the test requirement of 'power reverse connection' can be met without a series reverse-connection preventing device, the power output VCC is suitable for both resistive load and large inductive load, overvoltage and undervoltage parameters are adjustable and can respond in 5us, hardware current-limiting parameters are adjustable and can respond in 50ns, software overcurrent protection parameters are adjustable and can respond in 5us, the PCB heat dissipation area is small, the applicable environment temperature is high, and the cost is low.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A linear voltage-stabilized power supply circuit applied to an electronic controller of an automobile is characterized by comprising:
a level shift circuit for performing level shift on an input signal EN;
the controlled power supply circuit is connected with the level conversion circuit and the voltage source BAT +, and is used for correspondingly outputting different levels according to the output level of the level conversion circuit;
the voltage adjusting circuit is connected with the controlled power supply circuit and is used for adjusting the output voltage of the controlled power supply circuit and outputting a voltage signal C;
the current-limiting protection circuit is connected with the voltage regulating circuit and is used for outputting a voltage signal D after current-limiting protection is carried out on the output current of the voltage regulating circuit;
the output reverse protection circuit is connected with the current-limiting protection circuit and is used for outputting a power supply VCC after reverse protection;
the input end of the output voltage feedback circuit is connected with the output end of the output reverse protection circuit and is used for providing feedback voltage according to the output voltage of the output reverse protection circuit;
the input end of the programmable precision voltage reference circuit is connected with the output end of the output voltage feedback circuit, the output end of the programmable precision voltage reference circuit is connected with the output end of the controlled power supply circuit, and the programmable precision voltage reference circuit is used for correspondingly adjusting the input of the voltage adjusting circuit according to the feedback voltage;
the output detection circuit is connected with the output reverse protection circuit and is used for detecting the output voltage of the output reverse protection circuit and outputting a voltage signal VSense;
and the control circuit is connected with the output end of the voltage adjusting circuit, the output end of the current-limiting protection circuit, the output end of the output detection circuit and the input signal EN, and is used for controlling the output power VCC according to the voltage signal C and the voltage signal D.
2. A linear regulated power supply circuit for use in an automotive electronic controller as claimed in claim 1 further comprising a power supply protection circuit interposed between the voltage source BAT + and the controlled power supply circuit for protecting the voltage source BAT +.
3. A linear regulated power supply circuit for use in an automotive electronic controller as claimed in claim 1 further comprising a high frequency negative feedback circuit connected to both the current limiting protection circuit and the programmable precision voltage reference circuit for suppressing high frequency interference.
4. A linear regulated power supply circuit for use in an automotive electronic controller as claimed in claim 1 further including an output filter circuit connected to the output of said output reverse protection circuit for filtering the supply VCC output by said output direction protection circuit.
5. A linear regulated power supply circuit for use in an electronic controller for a vehicle according to claim 1 wherein:
the voltage adjusting circuit comprises a transistor Q1 and a resistor R13, the base electrode of the transistor Q1 is connected with the controlled power supply circuit through the resistor R13, the collector electrode of the transistor Q1 is connected with a voltage source BAT +, and the emitter electrode of the transistor Q1 outputs a voltage signal C.
6. The linear voltage-stabilized power supply circuit applied to the electronic controller of the automobile as claimed in claim 5, further comprising a temperature detection circuit, wherein the temperature detection circuit comprises a thermistor R3, the thermistor R3 is arranged in cooperation with the transistor Q1, the temperature detection circuit is used for detecting the temperature of the transistor Q1 and outputting a corresponding voltage VTemp according to the detected temperature, and an output end of the temperature detection circuit is connected with the control circuit.
7. A linear regulated power supply circuit as claimed in claim 1 wherein said level shifter circuit includes a transistor Q4, the base of said transistor Q4 being connected to the input signal EN, the collector of said transistor Q4 being connected to the controlled supply circuit, and the emitter of said transistor Q4 being connected to ground.
8. A linear voltage-stabilized power supply circuit applied to an electronic controller of a vehicle as claimed in claim 1, wherein the controlled power supply circuit comprises a transistor Q3 and a resistor R9, a resistor R12 and a resistor R15, wherein the emitter of the transistor Q3 is connected to a voltage source BAT + through a resistor R9, a resistor R12 is connected across the base and the emitter of the transistor Q3, the base of the transistor Q3 is connected to the level conversion circuit through a resistor R15, and the collector of the transistor Q3 outputs a voltage signal B.
9. A linear regulated power supply circuit as claimed in claim 1 wherein said current limiting protection circuit comprises a transistor Q2 and a resistor R8, the base of said transistor Q2 being connected to the output of said voltage regulation circuit, said resistor R8 being connected across the base and emitter of said transistor Q2, the collector of said transistor Q2 being connected to the input of said voltage regulation circuit, and the emitter of said transistor Q2 outputting the voltage signal D.
10. The linear voltage-stabilized power supply circuit applied to the electronic controller of the automobile as claimed in claim 1, wherein the output reverse protection circuit comprises a diode D1, the anode of the diode D1 is connected with the current-limiting protection circuit, and the cathode of the diode D1 outputs a power supply VCC.
CN202011454995.0A 2020-12-10 2020-12-10 Linear voltage-stabilized power supply circuit applied to automobile electronic controller Active CN112531647B (en)

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CN206060247U (en) * 2016-06-21 2017-03-29 广东金莱特电器股份有限公司 New type of current adjustable band defencive function charging circuit
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