CN116647028B - Switching power supply control circuit, vehicle-mounted system and vehicle - Google Patents
Switching power supply control circuit, vehicle-mounted system and vehicle Download PDFInfo
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- CN116647028B CN116647028B CN202310593531.5A CN202310593531A CN116647028B CN 116647028 B CN116647028 B CN 116647028B CN 202310593531 A CN202310593531 A CN 202310593531A CN 116647028 B CN116647028 B CN 116647028B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a switching power supply control circuit, on-vehicle system and vehicle specifically discloses switching power supply control circuit, switching power supply control circuit includes first power, second power, voltage detection unit and timing unit, and timing unit is connected with voltage detection voltage, and voltage detection unit is connected with first power, and control circuit has first mode and second mode, and under first mode, first power supply, under second mode, second power supply, and voltage detection unit is used for detecting the voltage of first power so that control circuit is in first mode or second mode, and timing unit is used for controlling the duration that control circuit got into under the second mode. The switching power supply control circuit can improve the robustness of a switching power supply system.
Description
Technical Field
The disclosure relates to the technical field of electronic circuits, in particular to a switching power supply control circuit, a vehicle-mounted system and a vehicle.
Background
The motor controller is an important controller in an electric automobile, and the robustness, the safety and the reliability are particularly important. In order to improve the reliability of a power supply in the current motor controller, a power supply architecture scheme with a backup power supply (or a redundant power supply) is often adopted, a low-voltage battery supplies power to the motor controller under normal working conditions, and when the low-voltage battery is undervoltage or power is lost, the backup power supply is switched in, and the backup power supply can take over the power supply of a main control chip of the motor controller, so that the motor controller is still in a controllable state.
In the related art, the control circuit controls the timing turn-off of the inverse power supply circuit through the main control chip, however, the timing turn-off of the inverse power supply is realized by depending on the main control chip, the function realization depends on the main control chip, if the main control chip is reset or abnormal in operation, the inverse power supply may be turned off in advance or cannot be turned off, and the robustness is poor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a switching power supply control circuit which can improve the robustness of a switching power supply system.
The embodiment of the disclosure also provides a vehicle-mounted system.
The embodiment of the disclosure also provides a vehicle.
The switching power supply control circuit of the embodiment of the invention comprises: a first power supply and a second power supply; the voltage detection unit is connected with the voltage detection voltage, the voltage detection unit is connected with the first power supply, the control circuit is provided with a first mode and a second mode, the first power supply supplies power in the first mode, the second power supply supplies power in the second mode, the voltage detection unit is used for detecting the voltage of the first power supply so that the control circuit is in the first mode or the second mode, and the timing unit is used for controlling the duration of the control circuit entering the second mode.
The switching power supply control circuit disclosed by the embodiment of the invention can improve the robustness of a switching power supply system.
In some embodiments, the voltage detection unit includes a comparator having a first input connected to a first reference voltage, a second input connected to a voltage output of the first power supply, and an inverter having an output connected to an input of the inverter for transmitting a comparison voltage, the comparator being configured to determine that the control circuit is in the first mode when the output voltage of the first power supply is greater than the first reference voltage, and determine that the control circuit is in the second mode when the output voltage of the first power supply is less than or equal to the first reference voltage.
In some embodiments, the voltage detection unit further includes a voltage division component, the voltage division component includes a first voltage division resistor and a second voltage division resistor, the first voltage division resistor and the second voltage division resistor are connected in series between the first power supply and the ground, and the second input terminal of the comparator is connected to a connection line between the first voltage division resistor and the second voltage division resistor.
In some embodiments, the voltage detection unit further comprises a filtering component located between the second voltage dividing resistor and the second input of the comparator.
In some embodiments, the timing unit includes a timer including a reset pin connected to the output of the inverter and an output pin connected to the second power supply, the timer configured to receive the comparison voltage to determine an on of the timer and to control a duration of the control circuit entering the second mode.
In some embodiments, the timing unit further includes a trigger component, the timer further includes a trigger pin, the trigger pin is connected with the trigger component, the trigger component includes a trigger resistor and a trigger capacitor, the trigger resistor is disposed between an output end of the comparator and the trigger pin, an input end of the trigger capacitor is connected with a lead between the trigger resistor and the trigger pin, and an output end of the trigger capacitor is grounded.
In some embodiments, the timing unit further comprises a timing component, the timer further comprises a discharge pin and a threshold pin, the timing component comprises a timing resistor and a timing capacitor, the timing resistor and the timing capacitor are connected in series between the timing unit input power supply and the ground, and the discharge pin and the threshold pin are connected to a connection line between the timing resistor and the timing capacitor.
In some embodiments, the duration of the control circuit entering the second mode is T, and t=1.1×r7×c2, where R7 is the resistance value of the timing resistor and C2 is the capacitance value of the timing capacitor.
In some embodiments, the switching power supply control circuit further includes an opening unit, the opening unit is located between the timer and the second power supply, the opening unit is used for opening and closing the second power supply, the opening unit includes a triode and an MOS tube connected in series, an input end of the triode is connected with an output end of the timer, and two output ends of the triode are respectively connected with the MOS tube and the ground.
In some embodiments, the turn-on unit further includes a current limiting component including a first current limiting resistor and a second current limiting resistor, the first current limiting resistor being disposed between the transistor and the timer, the second current limiting resistor being disposed between the transistor and the MOS transistor, and/or the turn-on unit further includes a third voltage dividing resistor connected between the second current limiting resistor and the second power supply.
In some embodiments, the switching power supply control circuit further comprises a first diode adapted to be mounted between the first power supply and the controller and a second diode adapted to be mounted between the MOS transistor and the controller.
The vehicle-mounted system of the embodiment of the disclosure comprises the switching power supply system.
The vehicle of the embodiment of the present disclosure includes the vehicle-mounted system as described in the above embodiment.
Drawings
Fig. 1 is a schematic diagram of a counter power supply circuit in the related art.
Fig. 2 is a schematic diagram of a switching power supply control circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural view of a timing unit according to an embodiment of the present disclosure.
Reference numerals:
the voltage detecting unit 100, the timing unit 200, the turn-on unit 300,
A first power supply 1, a second power supply 2, a comparator 3, an inverter 4,
The voltage dividing member 5, the first voltage dividing resistor 51, the second voltage dividing resistor 52,
The filtering means 6 are provided with a filtering means,
Timer 7, reset pin 71, output pin 72, trigger pin 73, discharge pin 74, threshold pin 75,
The trigger part 8, the trigger resistor 81, the trigger capacitor 82,
A timing part 9, a timing resistor 91, a timing capacitor 92,
Transistor 10, mos transistor 11,
The current limiting member 12, the first current limiting resistor 121, the second current limiting resistor 122,
A third voltage dividing resistor 13, a first diode 14, and a second diode 15.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1, the inverse power supply circuit in the related art is turned on and off at regular time by the control circuit of the main control chip, during normal operation, the control signal of the main control chip is output to be high level, when the low-voltage battery KL30 is normal, the low-voltage battery supplies power to the inside of the motor controller, when the low-voltage battery KL30 is under-voltage or loses power, the comparator 3U1 outputs to be low level, the inverter 4U3 converts to be high level, the and gate U2 outputs to be high level to control the conduction of Q1, and the standby power supply can continue to supply power to the inside of the motor controller, so as to realize inverse power supply. The main control chip can count time, when the count time is finished, the main control chip outputs a control signal to be low level, the output of the AND gate U2 is changed from high level to low level, the Q1 is turned off, and the reverse power supply is finished. The back power supply duration is controlled by the main control chip, however, the main control chip cannot be powered down or reset when the low-voltage storage battery is under-voltage or powered down, otherwise, the back power supply is turned off in advance due to the reset of the main control chip, or if the main control chip is abnormal in program or the output of an IO port is abnormal, the back power supply circuit can not be turned off, and the risks of overheat burnout and the like of the backup power supply exist.
As shown in fig. 2 to 3, the switching power supply control circuit according to the embodiment of the present invention includes a first power supply 1, a second power supply 2, a voltage detection unit 100 and a timing unit 200, the timing unit 200 is connected to the voltage detection voltage, the voltage detection unit 100 is connected to the first power supply 1, the control circuit has a first mode and a second mode, the first power supply 1 is powered in the first mode, the second power supply 2 is powered in the second mode, the voltage detection unit 100 is used to detect the voltage of the first power supply 1 so that the control circuit is in the first mode or the second mode, and the timing unit 200 is used to control the duration of the control circuit entering the second mode.
The first power source 1 is a low-voltage battery, the low-voltage battery supplies power to the inside of the motor controller, the second power source 2 is a standby power source, and the standby power source can be the low-voltage battery.
In the first mode, the first power supply 1 supplies power to the inside of the motor controller, and the second power supply 2 is turned off, and in the second mode, the first power supply 1 is turned off, and the second power supply 2 supplies power to the inside of the motor controller.
The voltage detection unit 100 is configured to detect a voltage of the first power source 1, and switch the control circuit from the first mode to the second mode when the detected voltage of the first power source 1 is lower than a preset threshold, whereas the control circuit remains in the first mode when the detected voltage of the first power source 1 is higher than or equal to the preset threshold.
The timing unit 200 is configured to control a duration of the control circuit entering the second mode, for example, the timing unit 200 sets the duration of the control circuit entering the second mode to be 5min, and then the second power supply 2 supplies power to the motor controller within 5 min.
Specifically, as shown in fig. 2 to 3, the voltage output terminal of the first power supply 1 is connected to the voltage detection unit 100, the output terminal of the voltage detection unit 100 is connected to the timing unit 200, and the timing unit 200 is disposed between the second power supply 2 and the internal power supply line of the motor controller for controlling the on period of the second power supply 2.
According to the switch power supply control circuit disclosed by the embodiment of the disclosure, the timing unit 200 is arranged, the main control chip is not required to control the timing turn-off function of the switch power supply control circuit, the switch power supply control circuit is realized completely through a hardware circuit, the circuit working state is not influenced by the main control chip, the situation that the reverse power supply is turned off in advance or cannot be turned off due to the reset or abnormal work of the main control chip is avoided, and the reliability and the robustness of a switch power supply system can be improved.
In some embodiments, the voltage detection unit 100 includes a comparator 3 and an inverter 4, where the comparator 3 has a first input terminal, a second input terminal, and an output terminal, the first input terminal is connected to the first reference voltage Vref, the second input terminal is connected to the voltage output terminal of the first power supply 1, the output terminal of the comparator 3 is connected to the input terminal of the inverter 4 to transmit the comparison voltage, the output terminal of the inverter 4 is connected to the timing unit 200, and the comparator 3 is configured to determine that the control circuit is in the first mode when the output voltage of the first power supply 1 is greater than the first reference voltage Vref, and determine that the control circuit is in the second mode when the output voltage of the first power supply 1 is less than or equal to the first reference voltage Vref.
Specifically, as shown in fig. 2, the first input terminal of the comparator 3 is connected to the voltage output terminal of the first power supply 1, the second input terminal of the comparator 3 inputs the first reference voltage Vref, and when the output voltage of the first power supply 1 is higher than the first reference voltage Vref, the control circuit is still in the first mode, in other words, the output voltage of the first power supply 1 is higher than the first reference voltage Vref, which indicates that the first power supply 1 does not have an under-voltage condition, and the first power supply 1 can still supply power to the inside of the motor controller. On the contrary, when the output voltage of the first power supply 1 is smaller than or equal to the first reference voltage Vref, the control circuit is switched from the first mode to the second mode, the first power supply 1 stops supplying power, and the second power supply 2 supplies power to the inside of the motor controller. By providing the comparator 3, the circuit structure can be simplified, and the voltage detection accuracy can be improved.
In some embodiments, the voltage detection unit 100 further includes a voltage division component 5, where the voltage division component 5 includes a first voltage division resistor 51 and a second voltage division resistor 52, the first voltage division resistor 51 and the second voltage division resistor 52 are connected in series between the first power source 1 and the ground, and the second input terminal of the comparator 3 is connected to a connection line between the first voltage division resistor 51 and the second voltage division resistor 52.
The relative sizes of the first voltage dividing resistor 51R4 and the second voltage dividing resistor 52R5 may be flexibly set based on the voltage detection requirement, and may be equal or unequal, and the first voltage dividing resistor 51R4 may be larger or the second voltage dividing resistor 52R5 may be larger, which is not limited herein.
Specifically, as shown in fig. 2, a first voltage dividing resistor 51 and a second voltage dividing resistor 52 are provided in series between the voltage output terminal of the first power supply 1 and ground, and the second input terminal of the comparator 3 is connected to a connection line between the first voltage dividing resistor 51 and the second voltage dividing resistor 52. Through setting up bleeder component 5 and comparator 3, can combine first reference voltage Vref to realize the detection to the voltage of first power supply 1, circuit structure is simple, and circuit element is with low costs, and detects the accuracy higher.
In some embodiments, the voltage detection unit 100 further comprises a filtering means 6, the filtering means 6 being located between the second voltage dividing resistor 52 and the second input of the comparator 3.
For example, the filter means 6 may be a filter capacitor.
Specifically, as shown in fig. 2, one end of the filter member 6 is connected to a connection line between the second voltage dividing resistor 52 and ground, and the other end of the filter member 6 is located between the second input end of the comparator 3 and the connection line between the first voltage dividing resistor 51 and the second voltage dividing resistor 52. By providing the filter means 6, the anti-interference capability of the circuit can be improved, and further the voltage detection accuracy of the first power supply 1 can be improved.
In some embodiments, the timing unit 200 comprises a timer 7, the timer 7 comprising a reset pin 71 and an output pin 72, the reset pin 71 being connected to the output of the inverter 4, the output pin 72 being connected to the second power supply 2, the timer 7 being arranged to receive the comparison voltage to determine the duration of the opening of the timer 7 and to control the control circuit to enter the second mode.
For example, the timer 7 may be a 555 timer 7 chip.
Specifically, as shown in fig. 2, the timer 7 includes a RESET pin 71RESET and an output pin 72OUT, the RESET pin 71RESET being connected to the output terminal of the inverter 4, the output pin 72OUT being connected to the second power supply 2. The voltage of the first power supply 1 is compared with the first reference voltage Vref to generate a comparison voltage after passing through the comparator 3, the comparison voltage is transmitted to the timer 7 through the inverter 4 and the RESET pin 71RESET, the timer 7 selects the state of the control circuit according to the comparison voltage, that is, the control circuit is in the first mode or the second mode, and if the control circuit enters the second mode, the operation duration of the control circuit in the second mode is controlled.
According to the switching power supply control circuit disclosed by the embodiment of the disclosure, the timer 7 is arranged, the mode of the control circuit is adjusted by utilizing hardware, the operation time of the control circuit in the second mode is controlled, the control circuit is not dependent on a main control chip, the working state of the circuit is not influenced by the main control chip, the situation that the reverse power supply is turned off in advance or cannot be turned off due to the reset or abnormal working of the main control chip is avoided, and the reliability and the robustness of a switching power supply system can be improved.
In some embodiments, the timing unit 200 further includes a trigger component 8, the timer 7 further includes a trigger pin 73, the trigger pin 73 is connected to the trigger component 8, the trigger component 8 includes a trigger resistor 81 and a trigger capacitor 82, the trigger resistor 81 is disposed between the output end of the comparator 3 and the trigger pin 73, an input end of the trigger capacitor 82 is connected to a lead between the trigger resistor 81 and the trigger pin 73, and an output end of the trigger capacitor 82 is grounded.
Specifically, as shown in fig. 2 and 3, the timer 7 further has a trigger pin 73TRIG, the trigger pin 73TRIG is connected to the output end of the comparator 3, a trigger capacitor 82 and a trigger resistor 81 are disposed between the trigger pin 73TRIG and the output end of the comparator 3, and two ends of the trigger capacitor 82 are respectively connected to a connection line and a ground between the trigger resistor 81 and the trigger pin 73 TRIG. By setting the trigger resistor 81 and the trigger capacitor 82 and matching with the trigger pin 73TRIG on the timer 7, delay can be generated, so that the level of the RESET pin 71RESET is firstly set high when the first power supply 1 is under voltage, then the trigger pin 73TRIG is pulled down again, thereby generating a falling edge on the trigger pin 73TRIG, and further triggering the second power supply 2 to supply power to the inside of the motor controller.
In some embodiments, the timing unit 200 further comprises a timing element 9, the timer 7 further comprises a discharge pin 74 and a threshold pin 75, the timing element 9 comprises a timing resistor 91 and a timing capacitor 92, the timing resistor 91 and the timing capacitor 92 are connected in series between the input power supply of the timing unit 200 and ground, and the discharge pin 74 and the threshold pin 75 are connected to a connection between the timing resistor 91 and the timing capacitor 92.
Specifically, as shown in fig. 2 and 3, the timer 7 further has a discharge pin 74DISCH and a threshold pin 75THRES, where the discharge pin 74DISCH and the threshold pin 75THRES are both connected to the timer 9, the timer 9 includes a timer resistor 91 and a timer capacitor 92 connected in series, one end of the timer resistor 91 is connected to the input voltage VDD, the other end of the timer resistor 91 is connected to one end of the timer capacitor 92, and the other end of the timer capacitor 92 is grounded.
By setting the timing resistor 91 and the timing capacitor 92 and matching with the discharge pin 74DISCH and the threshold pin 75THRES on the timer 7, the time of the control circuit in the second mode operation can be controlled, in other words, the time of the second power supply 2 supplying power to the inside of the motor controller can be controlled, and the time of the control circuit supplying power is controlled in a reverse mode by using hardware such as the resistor, the capacitor and the like, so that compared with the time of relying on a main control chip, the reliability and the robustness of the operation of the control circuit can be improved.
In some embodiments, the duration of time that the control circuit enters the second mode is T, and t=1.1×r7×c2, where R7 is the resistance value of the timing resistor 91 and C2 is the capacitance value of the timing capacitor 92.
For example, when the resistance value of the timing resistor 91 is 3 and the resistance value of the timing capacitor 92 is 4, the duration T of the control circuit entering the second mode is 13.2min, or the duration T of the control circuit entering the second mode is 13.2s. It should be noted that, the values of the timing capacitor 92 and the timing resistor 91 may be actually selected, so as to adjust the operation duration of the control circuit in the second mode, that is, adjust the duration of the second power supply 2 supplying power to the motor controller.
In some embodiments, the switching power supply control circuit further includes an opening unit 300, where the opening unit 300 is located between the timer 7 and the second power supply 2, the opening unit 300 is used to turn on and off the second power supply 2, the opening unit 300 includes a transistor 10 and a MOS transistor 11 connected in series, an input terminal of the transistor 10 is connected to an output terminal of the timer 7, and two output terminals of the transistor 10 are respectively connected to the MOS transistor 11 and ground.
Specifically, as shown in fig. 2, the input end of the triode 10 is connected with an output pin 72OUT on the timer 7, one output end of two output ends of the triode 10 is connected with the MOS transistor 11, the other output end of the triode 10 is grounded, and the MOS transistor 11 is installed between an internal power supply circuit of the motor controller and the second power supply 2. The connection between the second power supply 2 and the inside of the motor controller can be started by arranging the triode 10 and the MOS tube 11, so that the second power supply 2 supplies power to the inside of the motor controller.
In some embodiments, the turn-on unit 300 further includes a current limiting component 12, the current limiting component 12 includes a first current limiting resistor 121 and a second current limiting resistor 122, the first current limiting resistor 121 is disposed between the transistor 10 and the timer 7, the second current limiting resistor 122 is disposed between the transistor 10 and the MOS transistor 11, and/or the turn-on unit 300 further includes a third voltage dividing resistor 13, and the third voltage dividing resistor 13 is connected between the second current limiting resistor 122 and the second power supply 2.
Specifically, as shown in fig. 2, two ends of the first current limiting resistor 121 are respectively connected to the output pin 72OUT of the timer 7 and the input end of the triode 10, and two ends of the second current limiting resistor 122 are respectively connected to one output end of the triode 10 and the MOS transistor 11. By arranging the first current limiting resistor 121 and the second current limiting resistor 122, circuit damage caused by overlarge circuit current can be avoided, and the reliability and safety of the operation of the control circuit are improved.
Both ends of the third voltage dividing resistor 13 are respectively connected with a connecting line between the second current limiting resistor 122 and the MOS tube 11 and a connecting line between the second power supply 2 and the MOS tube 11. The third voltage dividing resistor 13 can improve the reliability and safety of the operation of the control circuit.
In some embodiments, the switching power supply control circuit further comprises a first diode 14 and a second diode 15, the first diode 14 being adapted to be mounted between the first power supply 1 and the controller, the second diode 15 being adapted to be mounted between the MOS transistor 11 and the controller.
Specifically, as shown in fig. 2, the positive electrode of the first diode 14 is connected with the first power supply 1, the negative electrode of the first diode 14 is connected with the internal power supply circuit of the motor controller, the positive electrode of the second diode 15 is connected with the second power supply 2, the negative electrode of the second diode 15 is connected with the internal power supply circuit of the motor controller, and by arranging the first diode 14, the damage to the motor controller when the first power supply 1 is reversely connected can be prevented, and the reverse current flowing into the first power supply 1 when the second power supply 2 supplies power to the motor controller can be prevented. By arranging the second diode 15, damage to the motor controller can be prevented when the second power supply 2 is reversely connected, and current can be prevented from reversely flowing into the second power supply 2 when the first power supply 1 supplies power to the motor controller.
The operation of the switching power supply control circuit according to the embodiment of the present disclosure is described below with reference to fig. 2 and 3.
The output voltage of the first power supply 1 is divided by the first voltage dividing resistor 51 and the second voltage dividing resistor 52, the voltage after the voltage division is compared with the first reference voltage Vref by the comparator 3, when the voltage of the first power supply 1 is higher than the set first reference voltage Vref, the comparator 3 outputs a high level, the high level is converted into a low level through the inverter 4 and is sent to the RESET pin 71RESET of the timer 7 chip, the output pin 72OUT of the timer 7 chip outputs the low level, the triode 10 is turned off, the MOS tube 11 is controlled to be turned off, the second diode 15 is also turned off, and the internal power supply of the controller is sourced from the first power supply 1.
When the voltage of the first power supply 1 is lower than the set first reference voltage Vref, the comparator 3 outputs a low level, which is converted to a high level by the inverter 4, and sent to the RESET pin 71RESET of the chip of the timer 7. Meanwhile, the voltage on the trigger capacitor 82 discharges through the trigger resistor 81, a falling edge is generated on the trigger pin 73TRIG of the timer 7 chip, the timer 7 chip recognizes that the output pin 72OUT can generate a high-level pulse signal after the falling edge is recognized, the pulse high-level duration time T is determined by the timing resistor 91 and the timing capacitor 92, the output pin 72OUT outputs a high level, the triode 10 is conducted, the MOS tube 11 is controlled to be conducted, the second diode 15 is also conducted, the reverse power supply is started, and at the moment, the internal power supply of the controller is derived from the second power supply 2; when the duration T is over, the output pin 72OUT returns to a low level, and the transistor 10 is turned off, so that the MOS transistor 11 is controlled to be turned off, the second diode 15 is also turned off, and the reverse power supply is turned off, thereby realizing a reverse power supply timing function.
The vehicle-mounted system of the embodiment of the disclosure comprises the switching power supply system of any one of the above.
The vehicle of the embodiment of the present disclosure includes the vehicle-mounted system of the above embodiment.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or in communication with each other, or in interaction with each other, unless explicitly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (12)
1. A switching power supply control circuit, comprising:
a first power supply (1) and a second power supply (2);
A voltage detection unit (100) and a timing unit (200), the timing unit (200) is connected with the voltage detection unit (100), the voltage detection unit (100) is connected with the first power supply (1), the control circuit has a first mode and a second mode, the first power supply (1) supplies power in the first mode, the second power supply (2) supplies power in the second mode, the voltage detection unit (100) is used for detecting the voltage of the first power supply (1) so that the control circuit is in the first mode or the second mode, and the timing unit (200) is used for controlling the duration of the control circuit entering the second mode;
The voltage detection unit (100) comprises a comparator (3) and an inverter (4),
The comparator (3) is provided with a first input end, a second input end and an output end, the first input end is connected with a first reference voltage, the second input end is connected with the voltage output end of the first power supply (1), the output end of the comparator (3) is connected with the input end of the inverter (4) to transmit comparison voltage, the output end of the inverter (4) is connected with the reset pin (71) of the timing unit (200),
The comparator (3) is configured to determine that the control circuit is in a first mode when the output voltage of the first power supply (1) is greater than the first reference voltage, and determine that the control circuit is in the second mode when the output voltage of the first power supply (1) is less than or equal to the first reference voltage.
2. The switching power supply control circuit according to claim 1, wherein the voltage detecting unit (100) further includes a voltage dividing section (5),
The voltage dividing component (5) comprises a first voltage dividing resistor (51) and a second voltage dividing resistor (52), the first voltage dividing resistor (51) and the second voltage dividing resistor (52) are connected in series between the first power supply (1) and the ground, and a second input end of the comparator (3) is connected to a connecting line between the first voltage dividing resistor (51) and the second voltage dividing resistor (52).
3. The switching power supply control circuit according to claim 2, characterized in that the voltage detection unit (100) further comprises a filtering means (6), the filtering means (6) being located between the second voltage dividing resistor (52) and the second input of the comparator (3).
4. Switching power supply control circuit according to claim 1, characterized in that the timing unit (200) comprises a timer (7), the timer (7) comprising a reset pin (71) and an output pin (72), the output pin (72) being connected to the second power supply (2),
The timer (7) is configured to receive the comparison voltage to determine a duration of time that the timer (7) is turned on and to control the control circuit to enter the second mode.
5. The switching power supply control circuit according to claim 4, wherein the timer unit (200) further comprises a trigger part (8), the timer (7) further has a trigger pin (73), the trigger pin (73) is connected with the trigger part (8), the trigger part (8) comprises a trigger resistor (81) and a trigger capacitor (82), the trigger resistor (81) is arranged between the output end of the comparator (3) and the trigger pin (73), the input end of the trigger capacitor (82) is connected with a lead wire between the trigger resistor (81) and the trigger pin (73), and the output end of the trigger capacitor (82) is grounded.
6. The switching power supply control circuit according to claim 4, wherein the timing unit (200) further comprises a timing member (9), the timer (7) further comprises a discharge pin (74) and a threshold pin (75),
The timing component (9) comprises a timing resistor (91) and a timing capacitor (92), the timing resistor (91) and the timing capacitor (92) are connected in series between an input power supply of the timing unit (200) and the ground, and the discharging pin (74) and the threshold pin (75) are connected to a connecting line between the timing resistor (91) and the timing capacitor (92).
7. The switching power supply control circuit according to claim 6, wherein a time period for the control circuit to enter the second mode is T, and t=1.1×r7×c2, wherein R7 is a resistance value of a timer resistor (91), and C2 is a capacitance value of a timer capacitor (92).
8. The switching power supply control circuit according to any one of claims 1-7, further comprising an opening unit (300), the opening unit (300) being located between a timer (7) and the second power supply (2), the opening unit (300) being configured to turn on and off the second power supply (2), the opening unit (300) comprising a transistor (10) and a MOS transistor (11), an input of the transistor (10) being connected to an output of the timer (7), two outputs of the transistor (10) being connected to the MOS transistor (11) and ground, respectively.
9. The switching power supply control circuit according to claim 8, wherein the turn-on unit (300) further comprises a current limiting member (12), the current limiting member (12) comprises a first current limiting resistor (121) and a second current limiting resistor (122), the first current limiting resistor (121) is provided between the transistor (10) and the timer (7), the second current limiting resistor (122) is provided between the transistor (10) and the MOS transistor (11), and/or the turn-on unit (300) further comprises a third voltage dividing resistor (13), and the third voltage dividing resistor (13) is connected between the second current limiting resistor (122) and the second power supply (2).
10. The switching power supply control circuit according to claim 8, further comprising a first diode (14) and a second diode (15), the first diode (14) being adapted to be mounted between the first power supply (1) and a controller, the second diode (15) being adapted to be mounted between the MOS transistor (11) and a controller.
11. A vehicle-mounted system comprising the switching power supply control circuit of any one of claims 1-10.
12. A vehicle comprising the in-vehicle system of claim 11.
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| CN116647028A (en) | 2023-08-25 |
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