CN213185876U - Power input circuit, ECU power circuit and vehicle - Google Patents
Power input circuit, ECU power circuit and vehicle Download PDFInfo
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- CN213185876U CN213185876U CN202021962433.2U CN202021962433U CN213185876U CN 213185876 U CN213185876 U CN 213185876U CN 202021962433 U CN202021962433 U CN 202021962433U CN 213185876 U CN213185876 U CN 213185876U
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Abstract
The utility model relates to a power technology field discloses a power input circuit, it is through setting up the module that steps up, first one-way conduction module and the one-way conduction module of second, make when the voltage rise of power is more slow, step up the power and supply power for the back stage circuit through the one-way conduction module of second by virtue of the module that steps up, after the voltage of power rises to the operating point, then the power is directly supplied power for the load through first one-way conduction module, thereby guarantee that the power supply is stable when the input power rises slowly, and then guaranteed the equipment performance. And simultaneously, the utility model discloses still correspondingly provide an ECU power supply circuit and vehicle.
Description
Technical Field
The utility model relates to a power technical field especially relates to a power input circuit, ECU power supply circuit and vehicle.
Background
At present, when some equipment is powered by a power supply, because the voltage of the power supply rises slowly, namely the power supply is electrified slowly, a rear-stage power supply circuit is unstable, and the performance of the equipment is influenced. For example, an external power source supplies power to a load (such as an ECU) through a power input circuit, and since the power source is slowly powered on, the subsequent power circuit is unstable, which affects the performance of the ECU.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power input circuit, ECU power supply circuit and vehicle, it can avoid among the prior art because the power goes up the slow unstable problem that leads to the back level power supply circuit on the power.
In order to solve the above technical problem, the present invention provides a power input circuit, which includes a voltage boosting module, a first unidirectional conducting module and a second unidirectional conducting module;
the positive pole of first one-way conduction module is used for connecting the power, the input of the module that steps up is used for connecting the power, the output of the module that steps up with the positive pole of the one-way conduction module of second is connected, the negative pole of first one-way conduction module with the negative pole of the one-way conduction module of second is connected the back and is regarded as power output, power output is used for connecting load circuit.
As a preferred scheme, the power input circuit further comprises a control module, a voltage reduction module and a voltage reduction feedback module;
the control module is provided with a detection end, the detection end of the control module is used for being connected with the anode of the power supply, and the cathode of the power supply is grounded;
the input end of the voltage reduction module is connected with the output end of the voltage boosting module, and the output end of the voltage reduction module is connected with the negative electrode of the second one-way conduction module;
the voltage reduction feedback module comprises a first resistor, a second resistor, a third resistor and a switch tube, wherein a first end of the second resistor is connected with an output end of the voltage reduction module, a second end of the second resistor is connected with a first end of the first resistor, a second end of the first resistor is grounded, a control end of the switch tube is connected with an output end of the control module, a first end of the switch tube is connected with a second end of the second resistor, a second end of the switch tube is connected with a first end of the third resistor, and a second end of the third resistor is grounded; and the feedback end of the voltage reduction module is connected with the second end of the second resistor.
Preferably, the power input circuit further includes an energy storage module, a first end of the energy storage module is connected to the output end of the voltage boost module, and a second end of the energy storage module is grounded.
Preferably, the energy storage module includes a capacitor, a first end of the capacitor is a first end of the energy storage module, and a second end of the capacitor is a second end of the energy storage module.
Preferably, the control module is further provided with an enable end, and the enable end of the control module is connected with the control end of the boost module.
As a preferred scheme, the switching tube is an N-channel MOS tube, a gate of the N-channel MOS tube is a control end of the switching tube, a drain of the N-channel MOS tube is a first end of the switching tube, and a source of the N-channel MOS tube is a second end of the switching tube.
Preferably, the first unidirectional conducting module includes a first diode, an anode of the first diode is an anode of the first unidirectional conducting module, and a cathode of the first diode is a cathode of the first unidirectional conducting module.
Preferably, the second unidirectional conducting module includes a second diode, an anode of the second diode is an anode of the second unidirectional conducting module, and a cathode of the second diode is a cathode of the second unidirectional conducting module.
In order to solve the same technical problem, the utility model provides an ECU power supply circuit still, including power, ECU and power input circuit, the positive pole of power respectively with the positive pole of first unidirectional flux module with the input of the module that steps up is connected, the negative pole ground connection of power, power output end with ECU connects.
In order to solve the same technical problem, the utility model also provides a vehicle, include ECU power supply circuit.
Compared with the prior art, the utility model provides a power input circuit's beneficial effect is in: through setting up the module that steps up, first one-way conduction module and second one-way conduction module for when the voltage of power rises more slowly, borrow the module that steps up the power and supply power for the back stage circuit through the one-way conduction module of second by the module that steps up, after the voltage of power rises to the operating point, then the power directly supplies power for the load through first one-way conduction module, thereby guarantee that the power supply is stable when the input power rises slowly, and then guaranteed equipment performance. And simultaneously, the utility model discloses still correspondingly provide an ECU power supply circuit and vehicle.
Drawings
Fig. 1 is a block diagram of a power input circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power input circuit in an embodiment of the present invention;
fig. 3 is a flowchart of the operation of the power input circuit in the embodiment of the present invention;
fig. 4 is a voltage variation diagram of the power input circuit in the power-on process in the embodiment of the present invention;
fig. 5 is a voltage variation diagram of the power input circuit in the process of voltage fluctuation in the embodiment of the present invention;
fig. 6 is a voltage variation diagram of the power input circuit in the power down process in the embodiment of the present invention;
FIG. 7 is a conventional power input circuit;
fig. 8 is a graph of voltage change during voltage fluctuations during power down for a conventional circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, a power input circuit according to an embodiment of the present invention includes a voltage boosting module 10, a first unidirectional conducting module 20, and a second unidirectional conducting module 30;
the positive pole of first one-way conduction module 20 is used for connecting power supply Battery, the input of boost module 10 is used for connecting power supply Battery, the output of boost module 10 with the positive pole of second one-way conduction module 30 is connected, the negative pole of first one-way conduction module 20 with the negative pole of second one-way conduction module 30 is connected the back and is regarded as power output, power output is used for connecting load circuit.
The embodiment of the utility model provides a through setting up boost module 10, first one-way conduction module 20 and second one-way conduction module 30 for when the voltage of power rises more slowly, borrow boost module 10 to the power step up and supply power for the back stage circuit through second one-way conduction module 30, after the voltage of power rises to the operating point, then the power is directly supplied power for the load through first one-way conduction module 20, thereby guarantee that the power supply is stable when the input power rises slowly, and then guaranteed the equipment performance.
Referring to fig. 2, in an alternative embodiment, the power input circuit further includes a control module MCU, a voltage-reducing module, and a voltage-reducing FeedBack module FeedBack;
the control module MCU is provided with a detection end ADC, the detection end ADC of the control module MCU is used for being connected with the anode of the power supply Battery, and the cathode of the power supply Battery is grounded;
the input end of the voltage reduction module is connected with the output end of the voltage boost module 10, and the output end of the voltage reduction module is connected with the negative electrode of the second unidirectional conduction module 30;
the voltage reduction feedback module comprises a first resistor R1_ a, a second resistor R2, a third resistor R1_ b and a switch tube Q1, wherein the voltage reduction feedback module comprises a first resistor R1_ a, a second resistor R2, a third resistor R1_ b and a switch tube Q1A first end of a second resistor R2 is connected to the output end of the voltage-reducing module, a second end of the second resistor R2 is connected to the first end of the first resistor R1_ a, a second end of the first resistor R1_ a is grounded, and a control end of the switch tube Q1 is connected to the output end U of the control module MCULA CTRL connection, a first terminal of the switching transistor Q1 is connected to the second terminal of the second resistor R2, a second terminal of the switching transistor Q1 is connected to the first terminal of the third resistor R1_ b, and a second terminal of the third resistor R1_ b is grounded; the feedback end of the voltage reduction module is connected with the second end of the second resistor R2.
In the middle of concrete implementation, boost module 10 is boost circuit, the step-down module is the step-down circuit, the embodiment of the utility model provides an increase feedback control circuit on the step-down circuit, the step-down circuit can be online through software adjustment step-down circuit output voltage according to the voltage Vref of feedback end, reaches the purpose of filtering the external power supply fluctuation, has reduced the influence of the power noise that produces when external power supply frequently fluctuates to load (for example ECU) performance.
Specifically, the switching tube Q1 is an N-channel MOS transistor, a gate of the N-channel MOS transistor is a control end of the switching tube Q1, a drain of the N-channel MOS transistor is a first end of the switching tube Q1, and a source of the N-channel MOS transistor is a second end of the switching tube Q1. Of course, the switching tube Q1 may also adopt other switching tube types according to actual use requirements, and further details are not described herein.
Referring to fig. 2, in an embodiment of the present invention, the power input circuit further includes an energy storage module, a first end of the energy storage module is connected to the output end of the voltage boosting module 10, and a second end of the energy storage module is grounded. Specifically, the energy storage module comprises a capacitor C1, a first terminal of the capacitor C1 is a first terminal of the energy storage module, and a second terminal of the capacitor C1 is a second terminal of the energy storage module. In the embodiment, the energy storage module is arranged, so that the power-down holding time of the circuit is improved, and the boosted voltage U is usedHAnd the energy storage capacitor is arranged on the power supply, so that the requirement of a power failure holding function on the capacity of the energy storage capacitor is reduced. In addition, the voltage U after boostingHThe upper part of the energy storage capacitor can be compared with UnormalThe upper energy storage uses less capacitors, and the area of the PCB is greatly saved.
Referring to fig. 2, in the embodiment of the present invention, the control module MCU further has an enable end, and the enable end U of the control module MCUHEN is connected to the control terminal of the boost module 10. An enabling end U passing through the control module MCUHEN, which can control the operation of the boost module 10.
In the embodiment of the present invention, the first unidirectional conducting module 20 includes a first diode D1, the positive electrode of the first diode D1 is the positive electrode of the first unidirectional conducting module 20, and the negative electrode of the first diode D1 is the negative electrode of the first unidirectional conducting module 20. The second unidirectional conducting module 30 includes a second diode D2, the anode of the second diode D2 is the anode of the second unidirectional conducting module 30, and the cathode of the second diode D2 is the cathode of the second unidirectional conducting module 30.
The embodiment of the present invention provides a power input circuit, whose working principle is described in detail below:
(1) power-on process
Referring to fig. 2 to 4, the input voltage V of the power supply BatteryBATBegins to rise when VBATTo reach Uboost_TH(e.g., minimum 3V), the boost circuit starts to operate normally to output UH(e.g., 20-36V). When U is turnedHTo reach Ubuck_THAnd then, the voltage reduction circuit starts to work, and the output voltage is as follows: u shapeL_a＝Vref/R1_ a (R1_ a + R2) (default output voltage, such as 9V) (U)L_a<UBAT_min，UBAT_minThe minimum normal operating voltage defined for the system). U shapeBAT<UL_aWhile, UL_aTo the power supply output (i.e. the back-stage power supply U)nomal) Supply power when UBATRise to UBAT_minWhile, UBATFor the rear stage power supply UnormalAnd (5) supplying power. Wherein, U in the drawings of the specificationboost_THFor the input voltage threshold, U, of the booster circuitbuck_THFor the input voltage threshold of the step-down circuit, TholdFor power-down hold time, UL_aFor the default output voltage of the step-down circuit, UL_bRegulating the output voltage, t, for a step-down circuitthThe voltage fluctuation detection time threshold.
The embodiment of the utility model provides an increased a low input voltage's boost circuit, can let the back stage circuit skip critical operating point fast when the input power rises slowly, solved the unstable problem of the back stage power supply circuit that the electricity slowly leads to on the external power source.
(2) Voltage fluctuation processing
When the MCU detects U through the ADC as shown in FIG. 2 and FIG. 5BATAbnormally fluctuating and having a duration greater than tthWhen the voltage drops and fluctuates greatly, the MCU controls the U through the GPIOL_CTRLOpening the switch tube Q1, ULThe voltage rises to UL_bVref/(R1_ a | | R1_ b) (R1_ a | | R1_ b + R2) such that UL_b>UBAT，UL_bFor the rear stage power supply UnormalAnd (5) supplying power. When the MCU detects U through the ADCBATNormal, duration>tthThen, the U is putLAdjusted to UL_A，UBATFor the rear stage power supply UnormalAnd (5) supplying power.
(3) Power down procedure
When the voltage U is input, as shown in FIG. 2 and FIG. 6BATFall to UBAT<ULRear, rear stage power supply UnormalBy ULPower supply, MCU detects UBATAnd after the data fall to the lowest working voltage threshold set by the system, the data before power failure are stored emergently. U shapeBATAfter the voltage drops to the working threshold of the voltage-increasing circuit, the system starts to discharge by the energy-storage capacitor C1, so that the voltage-decreasing circuit continues to work, and ULWhen the voltage of C1 is discharged to the minimum working voltage threshold (U) of the voltage reduction circuitbuck_TH) Rear stage power supply UnormalGradually decreases to be less than the actual minimum working voltage U of the systemSYS_THThe system is completely powered down.
Power-down retention time of the circuit of the embodiment: t ishold≈1/2*C1*(UH 2-Ubuck_TH 2)*η/Psys_min(ii) a Where η is the operating efficiency of the power input circuit, which can be regarded as the product of the operating efficiencies of the boost circuit and the buck circuit, Psys_minThe minimum power of the load circuit can be obtained by measurement or calculation in the prior art in practical application, and further details are not described herein.
Referring to fig. 7 and 8, a power input circuit (conventional circuit) in the prior art is shown in UnormalUpper energy storage, power down retention time: t ishold≈1/2*C1*(UBAT 2-USYS_TH 2)/Psys_min；
The capacitance capacity requirement of the present embodiment and that of the conventional circuit are exemplified below:
UBAT＝12V，USYS_TH＝6V，Psys_min＝1W，Thold_min＝100ms，UH＝30V，Ubuck_TH12V, η 80%, the minimum capacitance requirement:
the capacitance of the conventional circuit, C1 — min 2000 uF;
the capacitance C1_ min is 330 uF.
It is thus clear that the electric capacity of this embodiment has reduced 6 times for conventional circuit, can know by the above-mentioned analysis, the utility model discloses not only improve the circuit and fall electric hold time, still reduced and fallen the demand of electric hold function to energy storage capacitor capacity.
Correspondingly, the embodiment of the utility model provides a still provide an ECU power supply circuit, it includes power, ECU and power input circuit, the positive pole of power respectively with first unidirectional flux module 20 anodal with the input of boost module 10 is connected, the negative pole ground connection of power, power output end with ECU connects.
Correspondingly, the embodiment of the utility model provides a vehicle is still provided, it includes ECU power supply circuit.
Compared with the prior art, the embodiment of the utility model provides a power input circuit's beneficial effect is in: through setting up boost module 10, first one-way conduction module 20 and second one-way conduction module 30 for when the voltage of power rises more slowly, borrow by boost module 10 to the power boost and supply power for the back stage circuit through second one-way conduction module 30, after the voltage of power rises to the operating point, then the power directly supplies power for the load through first one-way conduction module 20, thereby guarantee that the power supply is stable when the input power rises slowly, and then guaranteed equipment performance. And simultaneously, the embodiment of the utility model provides a still correspondingly provides an ECU power supply circuit and vehicle.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. A power input circuit is characterized by comprising a boosting module, a first one-way conduction module and a second one-way conduction module;
the positive pole of first one-way conduction module is used for connecting the power, the input of the module that steps up is used for connecting the power, the output of the module that steps up with the positive pole of the one-way conduction module of second is connected, the negative pole of first one-way conduction module with the negative pole of the one-way conduction module of second is connected the back and is regarded as power output, power output is used for connecting load circuit.
2. The power input circuit of claim 1, further comprising a control module, a voltage reduction module, and a voltage reduction feedback module;
the control module is provided with a detection end, the detection end of the control module is used for being connected with the anode of the power supply, and the cathode of the power supply is grounded;
the input end of the voltage reduction module is connected with the output end of the voltage boosting module, and the output end of the voltage reduction module is connected with the negative electrode of the second one-way conduction module;
the voltage reduction feedback module comprises a first resistor, a second resistor, a third resistor and a switch tube, wherein a first end of the second resistor is connected with an output end of the voltage reduction module, a second end of the second resistor is connected with a first end of the first resistor, a second end of the first resistor is grounded, a control end of the switch tube is connected with an output end of the control module, a first end of the switch tube is connected with a second end of the second resistor, a second end of the switch tube is connected with a first end of the third resistor, and a second end of the third resistor is grounded; and the feedback end of the voltage reduction module is connected with the second end of the second resistor.
3. The power input circuit of claim 2, further comprising an energy storage module, wherein a first end of the energy storage module is connected to the output end of the boost module, and a second end of the energy storage module is grounded.
4. The power input circuit of claim 3, wherein the energy storage module comprises a capacitor, a first terminal of the capacitor is a first terminal of the energy storage module, and a second terminal of the capacitor is a second terminal of the energy storage module.
5. The power input circuit as claimed in claim 2, wherein the control module further has an enable terminal, and the enable terminal of the control module is connected to the control terminal of the boost module.
6. The power input circuit as claimed in claim 2, wherein the switch transistor is an N-channel MOS transistor, a gate of the N-channel MOS transistor is a control terminal of the switch transistor, a drain of the N-channel MOS transistor is a first terminal of the switch transistor, and a source of the N-channel MOS transistor is a second terminal of the switch transistor.
7. The power input circuit according to any one of claims 1-6, wherein the first one-way conduction module comprises a first diode, an anode of the first diode is an anode of the first one-way conduction module, and a cathode of the first diode is a cathode of the first one-way conduction module.
8. The power input circuit according to any one of claims 1 to 6, wherein the second unidirectional conducting module comprises a second diode, an anode of the second diode is an anode of the second unidirectional conducting module, and a cathode of the second diode is a cathode of the second unidirectional conducting module.
9. An ECU power supply circuit, characterized by comprising a power supply, an ECU and the power supply input circuit of any one of claims 1 to 8, wherein the positive pole of the power supply is respectively connected with the positive pole of the first unidirectional conducting module and the input end of the boosting module, the negative pole of the power supply is grounded, and the power supply output end is connected with the ECU.
10. A vehicle characterized by comprising the ECU power supply circuit according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021962433.2U CN213185876U (en) | 2020-09-09 | 2020-09-09 | Power input circuit, ECU power circuit and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021962433.2U CN213185876U (en) | 2020-09-09 | 2020-09-09 | Power input circuit, ECU power circuit and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN213185876U true CN213185876U (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021962433.2U Active CN213185876U (en) | 2020-09-09 | 2020-09-09 | Power input circuit, ECU power circuit and vehicle |
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| CN (1) | CN213185876U (en) |
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- 2020-09-09 CN CN202021962433.2U patent/CN213185876U/en active Active
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