CN111669048B - Power supply control module started in grading mode - Google Patents

Power supply control module started in grading mode Download PDF

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Publication number
CN111669048B
CN111669048B CN202010528922.5A CN202010528922A CN111669048B CN 111669048 B CN111669048 B CN 111669048B CN 202010528922 A CN202010528922 A CN 202010528922A CN 111669048 B CN111669048 B CN 111669048B
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unit
voltage
input
power
mos transistor
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CN111669048A (en
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邱燕
王斌
严龙
苍胜
黎颖
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China Aeronautical Radio Electronics Research Institute
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    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/36—Means for starting or stopping converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power supply control module for staged start, which comprises an input anti-reverse and impact current suppression unit: the input reverse prevention and the impact current suppression are realized; a surge suppression unit: when the voltage of the input power supply changes, outputting stable high-voltage bus voltage; a power-down maintaining unit: when the input power is down, the surge suppression module is powered; a bus conversion unit: converting the high-voltage bus voltage into a low-voltage bus voltage when the voltage of the input power supply changes; a detection and control unit: the voltage states of the input anti-reverse and impact current suppression unit, the surge suppression unit and the bus conversion unit are sampled, and the input anti-reverse and impact current suppression unit, the surge suppression unit, the bus conversion unit and the power failure maintaining unit are controlled in a grading mode according to the voltage states to be started. The invention effectively inhibits the impact current by starting circuits of all stages in a grading way, realizes the functions of input anti-surge, input power failure interruption maintenance and power supply conversion, and reduces the power consumption of the system.

Description

Power supply control module started in grading mode
Technical Field
The invention belongs to the field of electronic engineering, and relates to a power supply control module started in a grading manner.
Background
The power supply module is a power conversion module in an electronic product, has the function of converting an input power source in the product into a power supply variety required by the product, and meets the requirements of a system on input voltage surge, impulse current and the like. In some high-reliability application occasions, a product is required to maintain normal operation within a certain time when power supply input is interrupted due to power failure. Taking an onboard secondary power supply as an example, a secondary power supply conversion circuit of an electrical device is generally required to have functions of surge voltage suppression, power failure maintenance, DC/DC conversion, signal monitoring and the like, and a functional circuit of the secondary power supply conversion circuit is shown in fig. 1.
The power module generally includes 6 circuit units, which are an input anti-reverse and impact current suppression unit, a surge voltage suppression unit, a power failure maintenance circuit unit, a DC/DC conversion and output filter unit, an output redundancy unit, and a control and monitoring circuit unit, and the following description specifically describes each circuit unit.
The input reverse connection prevention and impact current suppression unit realizes the protection effect on the back-end circuit under the condition that the polarity of the power supply is reversely connected, prevents back voltage breakdown and input impact current suppression, and performs input filtering. The input reverse connection preventing circuit is realized by adopting a diode, and internal components are not damaged when reverse voltage is input by utilizing the one-way conductivity of the diode. The impulse current suppression circuit mainly achieves suppression of power-on transient impulse current, the power-on transient impulse current suppression is achieved by controlling the conduction state of a P MOSFET on a positive line and utilizing different working states of the MOSFET, and the function of low-power-consumption conduction in a steady state is guaranteed, and input filtering is mainly achieved by filtering an input power supply through an LC filter.
The surge voltage suppression unit ensures the function of the output voltage range in the normal input voltage range of the rear-end DC/DC by applying a switching power supply when the input power supply voltage has undervoltage surge and overvoltage surge.
The power-down maintaining circuit unit ensures that the power module can maintain normal power output for a certain time when the input power supply is interrupted due to power failure, so that the product can be protected on site before power-off, damage to the product is avoided, and the power-down maintaining circuit unit is generally realized by discharging of the energy storage capacitor.
DC/DC conversion and output filter circuit unit: the DC-DC conversion chip is selected to convert the input voltage into various voltage values, and a filter circuit consisting of capacitors is distributed at each output voltage port.
The detection and control circuit unit realizes the monitoring and control of the input control signal and the state of the power supply module. The state of the power supply module is output to indicate BIT by detecting state quantities such as input voltage state, output voltage state, temperature state, input control quantity and the like of the power supply module, and the on-off of the DC/DC conversion module is controlled.
The output redundancy unit is only used in a system with a plurality of power supply modules in redundancy, when one power supply module is damaged, the output of the power supply module is normal, and the reliable operation of the system is ensured. The unit is mainly realized through a Schottky diode, the unidirectional conductivity of the diode is utilized, when one power supply module fails, the power supply is automatically cut off, the output voltage of a secondary power supply is not affected, and the normal work of the system is ensured.
Although the power supply module adopting the conventional technology can meet the application requirements of many occasions, the power supply module is difficult to optimize in the aspects of performance, reliability, volume, cost, power consumption and the like, and has the following three main problems.
In a first aspect: the existing power-down maintaining circuit unit is generally realized by charging and discharging of an energy storage capacitor, and the power-down maintaining output time of the energy storage capacitor can be obtained by a formula 1. As shown in equation 1, V is increased 1 The value can greatly reduce the capacity of the energy storage capacitor, so that a booster circuit is generally added in the power failure maintaining unit to raise the voltage of the energy storage capacitor, as shown in fig. 2, the energy storage capacitor is stable in energy storage, the capacity of the maintaining capacitor is low, but the withstand voltages of the booster circuit and the maintaining capacitor need to be increased.
Figure BDA0002534528350000021
Wherein C: capacity value of energy storage capacitor
P: input power of product
Δ t: power down hold output time
V 1 : maximum voltage value at two ends of capacitor capable of working normally
V 2 : the product can work normally by the minimum voltage value at two ends of the capacitor
As is clear from the capacitance characteristics, the charging current is inversely proportional to the charging time when the charging voltage is the same. The energy storage capacitor generally has a large capacity, which is several thousands to several tens of thousands of microfarads, and the larger the charging current is, the larger the output power of the boosting module is, the larger the volume and the weight are, and the smaller the charging current is, the longer the charging time is, and the order of magnitude of the charging current reaches the second level, so that the design of the power-down maintaining unit has certain difficulty.
In a second aspect: the existing airborne power module maintaining unit directly gets electricity from an input end, surge impact current of the existing airborne power module maintaining unit cannot be restrained, and the existing standard has requirements on peak value and maintaining time of the impact current. The large-capacity energy storage capacitor in the maintaining unit is charged, the impact current and the charging time are both large, and the design difficulty is large.
In a third aspect: if the output redundancy unit uses a schottky diode mode, the schottky diode has larger voltage drop and power consumption due to lower output voltage and larger power, and the problems of heat dissipation and output precision exist. If the input anti-reverse unit adopts a diode mode to prevent reverse, the problem of power dissipation also exists.
Disclosure of Invention
The present invention provides a power control module with a hierarchical start to solve the above problems of the conventional power modules.
The invention aims to be realized by the following technical scheme:
a power supply control module started in a grading way comprises an input anti-reverse and impact current suppression unit, a surge suppression unit, a bus conversion unit, a power failure maintaining unit and a detection and control unit;
the input anti-reverse and impact current suppression unit is configured to realize input anti-reverse and impact current suppression and output the power supply with stable current to the surge suppression unit under the control of the detection and control unit;
the surge suppression unit is configured to output a stable high-voltage bus voltage when the voltage of the input power supply changes under the control of the detection and control unit;
the power failure maintaining unit is configured to charge the energy storage capacitor by using the high-voltage bus voltage output by the surge suppression unit during normal work under the control of the detection and control unit, and supply power to the surge suppression module by using the energy storage capacitor when power failure is input;
the bus conversion unit is configured to convert the high-voltage bus voltage into the low-voltage bus voltage when the voltage of the input power supply changes under the control of the detection and control unit;
the detection and control unit is configured to sample the voltage states of the input anti-reverse and impact current suppression unit, the surge suppression unit and the bus conversion unit and control the start of the input anti-reverse and impact current suppression unit, the surge suppression unit, the bus conversion unit and the power failure maintaining unit in a grading manner according to the voltage states.
Preferably, the input anti-reverse and impact current suppression unit comprises a P-channel MOS tube Q1, a P-channel MOS tube Q2 and an N-channel MOS tube Q3, wherein the drain electrode of the P-channel MOS tube Q1 is connected with the input power supply, the source electrode of the P-channel MOS tube Q1 is connected with the source electrode of the P-channel MOS tube Q2, the grid electrode of the P-channel MOS tube Q1 and the grid electrode of the P-channel MOS tube Q2 are connected with the drain electrode of the N-channel MOS tube Q3, the grid electrode of the N-channel MOS tube Q3 is connected with the timing signal, and the input anti-reverse is realized by the body diode of the MOS tube Q1; after normal working voltage is input, the conduction impedance of the MOS tube Q1 and the MOS tube Q2 is controlled by controlling the conduction state of the MOS tube Q3 in a time sequence manner, so that impact current suppression is realized; after the system is normally started, the gate-source voltage of the MOS tube Q1 and the MOS tube Q2 is set to be higher than 10V, and the MOS tube Q1 and the MOS tube Q2 are in saturated conduction.
Preferably, the surge suppression unit adopts a voltage stabilizing circuit, and the bus conversion unit adopts an unstable voltage switching power converter.
Preferably, the power-down maintaining unit comprises an energy storage capacitor, a charging switch and a discharging switch, and when the power-down maintaining unit normally works, the high-voltage bus charges the energy storage capacitor through the charging switch; when the input is in power failure, the energy storage capacitor discharges the surge suppression module through the discharge switch; the charging switch and the discharging switch are controlled by the detection and control unit.
Preferably, the power control module started in stages further comprises an output redundancy unit, the output redundancy unit is configured to perform fault isolation on the multiplexed output in parallel under the control of a timing sequence, and the timing sequence signal is provided by the detection and control unit.
Preferably, the output redundancy unit comprises an MOS tube Q4 and a driver, and the driver generates a voltage difference larger than 10V at two ends of a grid-source of the MOS tube Q4 when in work, and the MOS tube Q4 is completely conducted; during protection, the driver enables the voltage difference between the two ends of the grid and the source of the MOS transistor Q4 to be approximate to 0V, at the moment, the impedance between the source and the drain is infinite, current cannot flow, meanwhile, the direction of the diode in the MOS transistor Q4 is consistent with the direction of normal working current, reverse cut-off is realized, and power supply input is automatically cut off.
The invention has the beneficial effects that:
the power supply module provided by the invention can meet the application requirements of all occasions, has the advantages of good performance and high reliability, and can realize miniaturization, low cost and low power consumption. These techniques have been practically applied to avionics products.
The output redundancy unit realizes one-way conductivity by controlling the grid electrode of the MOS tube, replaces a diode to realize the redundancy and reverse connection prevention functions of the system, and effectively reduces the power consumption of the system.
The surge suppression unit, the power failure maintaining unit and the bus conversion unit are started in a grading way through the detection and control unit, so that the voltage conversion function, the power failure interruption function, the surge voltage suppression function and other functions are realized, the types of the DC/DC converter are reduced, the size and the cost are reduced, and the system impact current is effectively controlled.
Drawings
Fig. 1 is a functional circuit block diagram of a conventional power module.
Fig. 2 is a block diagram of a conventional power down maintenance unit.
Fig. 3 is a functional circuit block diagram of the power control module with staged start according to the embodiment.
Fig. 4 is a schematic block diagram of a main loop of the input anti-reverse and inrush current suppression unit according to the embodiment.
Fig. 5 is a schematic block diagram of an output redundancy unit according to an embodiment.
Fig. 6 is a block diagram of a power loss maintaining unit according to an embodiment.
FIG. 7 is a block diagram of the control logic of the detection and control unit according to the embodiment
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 3, the power control module for hierarchical startup in this embodiment includes an input reverse-prevention and impact-current-prevention suppression unit, a surge suppression unit, a bus conversion unit, an output redundancy unit, a power-down maintaining unit, and a detection and control unit.
The input anti-reverse and impact current suppression unit is configured to realize input anti-reverse and impact current suppression and output the power supply with stable current to the surge suppression unit under the time sequence control.
Preferably, as shown in fig. 4, the schematic block diagram of the main circuit of the input anti-reverse and inrush current suppression unit is that the drain of the P-channel MOS transistor Q1 is connected to the input power supply, the source of the P-channel MOS transistor Q1 is connected to the source of the P-channel MOS transistor Q2, the gate of the P-channel MOS transistor Q1, the gate of the P-channel MOS transistor Q2 and the drain of the N-channel MOS transistor Q3 are connected, and the gate of the N-channel MOS transistor Q3 is connected to the timing signal. After normal working voltage is input, the on-state of the MOS tube Q3 is controlled through time sequence control to control the on-resistance of the MOS tube Q1 and the MOS tube Q2, so that impact current suppression is realized, after a system is normally started, the grid source voltage of the MOS tube Q1 and the MOS tube Q2 is set to be higher than 10V, the MOS tube Q1 and the MOS tube Q2 are in saturated conduction, the on-resistance is several milliohms to dozens of milliohms, the generated power consumption is small, and the heat dissipation requirement is low.
The surge suppression unit is configured to output a stable high voltage bus voltage when a voltage of the input power supply varies.
Preferably, the surge suppressing unit adopts a voltage stabilizing circuit, and when the input voltage of the power supply changes, the output voltage is raised to a high-voltage bus voltage.
The power failure maintaining unit is configured to be controlled by the detection and control unit, and when the power failure maintaining unit works normally, the energy storage capacitor is charged by the high-voltage bus voltage output by the surge suppression unit, and when the power failure is input, the surge suppression module is powered by the energy storage capacitor.
Preferably, the power-down maintaining unit includes an energy storage capacitor, a charging switch, and a discharging switch, as shown in fig. 6. When the high-voltage bus works normally, the high-voltage bus charges the energy storage capacitor through the charging switch; when the input is in power failure, the energy storage capacitor discharges electricity to the surge suppression module through the discharge switch, so that the system can normally work for a certain time. The charging switch and the discharging switch are controlled by the detection and control unit.
The power supply conversion modules of the surge voltage suppression unit and the power failure maintaining unit are combined into one module, so that the size and the cost are effectively reduced.
The bus bar transformation unit is configured to transform a high voltage bus bar voltage into a low voltage bus bar voltage.
Preferably, the bus conversion unit uses an unregulated switching power converter. Because the voltage of the input high-voltage bus is stabilized, a non-stabilized switching power supply converter is adopted in the bus conversion unit, and high conversion efficiency and high reaction rate are realized.
The output redundancy unit is configured to have a fault isolation effect when the multiplexed outputs are connected in parallel under the timing control.
Preferably, the output redundancy unit uses an MOS tube to replace a diode, the body diode direction of the MOS tube is directed to output from input, and when the system works normally, the MOS tube is fully conducted, so that the power consumption is reduced. As shown in fig. 5, both the P-channel MOS transistor and the N-channel MOS transistor are suitable for this embodiment, and the N-channel MOS transistor is taken as an example, the output redundancy unit is a circuit formed by the N-channel MOS transistor and the driver, which is similar to an ideal diode, when the output redundancy unit works, the driver generates a voltage difference greater than 10V at the two ends of the gate-source of the MOS transistor Q4, at this time, the MOS transistor Q4 is completely turned on, vin supplies power to Vout through Q1, the on-resistance between the source and the drain is very low, and when a large current is passed, the voltage difference is very small, and the power consumption is small; during protection, the driver enables the voltage difference between two ends of a grid and a source of the MOS transistor Q4 to be approximate to 0V, and at the moment, the impedance between the source and a drain is infinite, so that current cannot flow; meanwhile, the parasitic internal diode direction of the field effect transistor is consistent with the normal working current direction, the reverse cut-off is realized, and the input of the circuit is automatically cut off.
The detection and control unit samples the state quantity of the input anti-reverse and impact current suppression unit, the surge suppression unit and the bus conversion unit, samples the voltage state of each level, and controls the power-on time sequence of the input anti-reverse and impact current suppression unit, the surge suppression unit and the bus conversion unit in a grading manner, so that the system impact current meets the standard requirement.
The detection and control unit also controls the charging and discharging of the power-down maintaining unit, the control logic is as shown in fig. 7, the input voltage is detected firstly, and if the voltage value is higher than the input voltage threshold value, the charging switch is opened to charge the energy storage capacitor. In consideration of the power problem of the surge suppression unit, the energy storage capacitor is charged with a certain current to reduce the charging time, and then the enabling switch of the bus converter is opened to enable the bus converter to maintain a certain working time of the system. And because a grading starting mode is adopted, the impact current of the system can be effectively reduced.
In the design of the detection and control unit, by starting circuits at all levels in a grading way, impact current is effectively inhibited, the functions of input surge resistance, input power failure interruption maintenance and power supply conversion are realized, and the power consumption of the system is reduced. The surge suppression unit, the power failure maintaining unit and the bus conversion unit are started in a grading way through the detection and control unit, and the functions of voltage conversion, power failure interruption, surge voltage suppression and the like are realized. The surge suppression unit adopts a boost mode, and a DC/DC converter can be reduced in the power failure maintaining unit. And through the hierarchical mode of starting, can effectively control system impulse current.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.

Claims (6)

1. A power supply control module started in a grading manner comprises an input anti-reverse and impact current suppression unit, a surge suppression unit, a bus conversion unit, a power failure maintaining unit and a detection and control unit;
the input anti-reverse and impact current suppression unit is configured to realize input anti-reverse and impact current suppression and output the power supply with stable current to the surge suppression unit under the control of the detection and control unit;
the surge suppression unit is configured to output a stable high-voltage bus voltage when the voltage of the input power supply changes under the control of the detection and control unit;
the power failure maintaining unit is configured to charge the energy storage capacitor by using the high-voltage bus voltage output by the surge suppression unit under the control of the detection and control unit during normal work, and supply power to the surge suppression module by using the energy storage capacitor when power failure is input;
the bus conversion unit is configured to convert the high-voltage bus voltage into the low-voltage bus voltage when the voltage of the input power supply changes under the control of the detection and control unit;
the detection and control unit is configured to sample the voltage states of the input anti-reverse and impact current suppression unit, the surge suppression unit and the bus conversion unit and control the start of the input anti-reverse and impact current suppression unit, the surge suppression unit, the bus conversion unit and the power failure maintaining unit in a grading mode according to the voltage states.
2. The power control module of claim 1, wherein the input anti-inversion and surge current suppression unit comprises a P-channel MOS transistor Q1, a P-channel MOS transistor Q2, and an N-channel MOS transistor Q3, the drain of the P-channel MOS transistor Q1 is connected to the input power supply, the source of the P-channel MOS transistor Q1 is connected to the source of the P-channel MOS transistor Q2, the gate of the P-channel MOS transistor Q1, the gate of the P-channel MOS transistor Q2, and the drain of the N-channel MOS transistor Q3 are connected to the timing signal, and the input anti-inversion is implemented by the body diode of the MOS transistor Q1; after normal working voltage is input, the conduction impedance of the MOS tube Q1 and the MOS tube Q2 is controlled by controlling the conduction state of the MOS tube Q3 in a time sequence manner, so that the suppression of impulse current is realized; after the system is normally started, the gate-source voltage of the MOS tube Q1 and the gate-source voltage of the MOS tube Q2 are set to be higher than 10V, the MOS tube Q1 is set, and the MOS tube Q2 is in saturated conduction.
3. The power control module of claim 1, wherein the surge suppressing unit employs a voltage stabilizing circuit, and the bus conversion unit employs an unregulated switching power converter.
4. The power control module of claim 1, wherein the power-down maintaining unit comprises an energy storage capacitor, a charging switch, and a discharging switch, and during normal operation, the high-voltage bus charges the energy storage capacitor through the charging switch; when the input is in power failure, the energy storage capacitor discharges to the surge suppression module through the discharge switch; the charging switch and the discharging switch are controlled by the detection and control unit.
5. The power control module of claim 1, further comprising an output redundancy unit configured to isolate faults when the outputs are connected in parallel under timing control, the timing signal being provided by the detection and control unit.
6. The power control module of claim 5, wherein the output redundancy unit comprises a MOS transistor Q4 and a driver, and the driver generates a voltage difference of more than 10V across the gate-source of the MOS transistor Q4 during operation, and the MOS transistor Q4 is fully turned on; during protection, the driver enables the voltage difference between the two ends of the grid and the source of the MOS transistor Q4 to be approximate to 0V, at the moment, the impedance between the source and the drain is infinite, current cannot flow, meanwhile, the direction of the diode in the MOS transistor Q4 is consistent with the direction of normal working current, reverse cut-off is realized, and power supply input is automatically cut off.
CN202010528922.5A 2020-06-11 2020-06-11 Power supply control module started in grading mode Active CN111669048B (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2005073403A (en) * 2003-08-25 2005-03-17 Sony Corp Rush current suppressing circuit
CN101882864A (en) * 2010-06-25 2010-11-10 杭州矽力杰半导体技术有限公司 Electrifying startup circuit and electrifying startup method thereof
CN105857215A (en) * 2016-04-21 2016-08-17 中国北方车辆研究所 Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply
CN210724557U (en) * 2019-11-12 2020-06-09 中国航空无线电电子研究所 Instantaneous power-down holding circuit with reverse-prevention and power-on impact current suppression

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200713762A (en) * 2005-09-06 2007-04-01 Acbel Polytech Inc AC-DC converter capable of actively suppressing inrush current
US7787271B2 (en) * 2008-01-08 2010-08-31 Dell Products, Lp Power supply start-up and brown-out inrush management circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005073403A (en) * 2003-08-25 2005-03-17 Sony Corp Rush current suppressing circuit
CN101882864A (en) * 2010-06-25 2010-11-10 杭州矽力杰半导体技术有限公司 Electrifying startup circuit and electrifying startup method thereof
CN105857215A (en) * 2016-04-21 2016-08-17 中国北方车辆研究所 Reverse-connection-preventing and power-off post-processing circuit for vehicle-mounted control unit power supply
CN210724557U (en) * 2019-11-12 2020-06-09 中国航空无线电电子研究所 Instantaneous power-down holding circuit with reverse-prevention and power-on impact current suppression

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