CN203339945U - Vehicle-mounted power supply transformation protection device - Google Patents
Vehicle-mounted power supply transformation protection device Download PDFInfo
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- CN203339945U CN203339945U CN2013202991353U CN201320299135U CN203339945U CN 203339945 U CN203339945 U CN 203339945U CN 2013202991353 U CN2013202991353 U CN 2013202991353U CN 201320299135 U CN201320299135 U CN 201320299135U CN 203339945 U CN203339945 U CN 203339945U
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Abstract
The utility model relates to a vehicle-mounted power supply transformation protection device, which comprises a filtering protection unit, a step-down transformation unit and a voltage-stabilizing output unit. The filtering protection unit used for carrying out the pre-stage protection and the EMI filtering operation for a vehicle-mounted power input terminal is composed of an over-current protection module, an over-voltage protection module, a voltage defend-counterattacking protection module and a pi-type filtering module. The impacts of both the reverse voltage and the transient voltage are inhibited and eliminated by the filtering protection unit. The step-down transformation unit is used for transforming the voltage output by the filtering protection unit into constant low-voltage signals and outputting the signals to the voltage-stabilizing output unit. The main body of the step-down transformation unit is in the form of a wide-voltage-input DC step-down module. The voltage-stabilizing output unit is used for outputting a stable system voltage under various interference conditions and is composed of a boosting/step-down type DC voltage module, a power storage module and a discharge protection module. The vehicle-mounted power supply transformation protection device has good inhibition effect on both high-voltage transient interference and low-voltage transient interference. Meanwhile, the interference of the device to the outside is minimized.
Description
Technical field
The utility model relates to a kind of power conversion protective device, relates in particular to a kind of vehicle power conversion protective device.
Background technology
Vehicle power is the common source of numerous vehicle mounted electrical apparatus and electronic equipment on car.The switch of the large electric current such as cold start, motor, air-conditioning, inductive load, all can produce very large harassing and wrecking to vehicle power, affects electronic equipment normally to move, and even causes permanent damage.Same electronic equipment also may be disturbed other electrical equipment, electronic equipment when operation, affects its service behaviour, as FM, GPS and the stereo set of car running computer.In existing technical solution, more representational have: number of patent application is CN200520036718.2, patent name is " vehicle power ", and the vehicle power scheme provided is to adopt a simple voltage-dropping type or buck-boost type DCDC to carry out the voltage stabilizing processing to vehicle power.Number of patent application is CN200810124781.X, and patent name is " electricity disturbance absorption circuit of vehicle-mounted power supply ", and the vehicle power scheme provided is to adopt voltage detecting+MOS switch protecting circuit to absorb the high pressure glitch of power supply.
But such scheme does not all take into full account protections such as negative voltage, power supply fall, when being subject to supply voltage, equipment falls, during the situation such as negative pressure interference, and electronic equipment there will be reset interrupt, even damages.These designs simultaneously all do not have to consider how to suppress the outside harassing and wrecking of this equipment, to reach the purpose that does not affect the normal operation of other electric appliance and electronic equipment as far as possible.
The utility model content
The purpose of this utility model is for deficiency of the prior art, provide a kind of high pressure, low pressure glitch are all had to good inhibition, and minimum level reduces the reliable vehicle power conversion protective device of this equipment to external disturbance.
For completing above-mentioned purpose, the technical solution adopted in the utility model is: a kind of vehicle power conversion protective device comprises the filtering protected location, decompression transformation unit and the voltage stabilizing output unit that connect successively; Wherein, described filtering protected location has been used for prime protection and the EMI filter function of vehicle power input, formed by overcurrent protection module, overvoltage protective module, voltage counnter attack protection module, π type filtration module, reverse voltage, transient voltage are impacted and suppress to eliminate; Described decompression transformation unit has been used for the voltage transformation of described filtering protected location output is become to constant low voltage signal, export to described voltage stabilizing output unit, main body is the wide input voltage DC decompression module met the demands, reduce the impact of vehicle-mounted input power fluctuation on rear class, also reduce the requirement of rear class voltage stabilizing output unit input voltage range simultaneously; Described voltage stabilizing output unit has been used for the stable output of system voltage under various disturbed conditions, step-up/step-down type dc voltage module, energy-storage module, discharge prevention module, consists of.
Vehicle power conversion protective device operation principle of the present utility model and flow process are as follows:
Steps A: the input vehicle power is successively after filtering after the overcurrent protection module of protected location, overvoltage protective module, voltage counnter attack protection module, π type filtration module, and transient voltage is harassed by basic filtering, sends into the decompression transformation unit; Simultaneously will be in the other direction from the interference filtering that transmits of level system, be not delivered to the vehicle power input, prevent from other electric/electronic device is produced and disturbs;
Step B: the decompression transformation unit becomes to stablize low-voltage output to the voltage stabilizing output unit by the voltage transformation of filtering protected location input;
Step C: the voltage stabilizing output unit completes the stable output of system voltage under various disturbed conditions, when input voltage falls, by energy-storage module, ensures the normal operation of step-up/step-down type dc voltage module, and system works voltage is unaffected; When the long-time interruption of system input power causes the energy-storage module energy to be about to exhaust; the discharge prevention module is responsible for stopping the work of step-up/step-down type dc voltage module; and bleed off rapidly the electric energy stored in the rear class system capacitance, and allow system complete fast lower electric process, wait for that vehicle power recovers.
Compared with prior art; the vehicle power conversion protective device that the utility model provides; the vehicle power that has a large amount of interference signals can be converted to reliable and stable electronic apparatus system input power, especially can overcome the insurmountable input voltage of common equipment and fall interference problem, this electronic equipment reverse harassing and wrecking problem to vehicle power.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the implementing circuit schematic diagram of the utility model filtering protected location;
Fig. 3 is the implementing circuit schematic diagram of the utility model decompression transformation unit;
Fig. 4 is the implementing circuit exemplary plot of the utility model voltage stabilizing output unit.
Embodiment
A kind of vehicle power conversion protective device as shown in Figure 1, comprise the filtering protected location 1, decompression transformation unit 2 and the voltage stabilizing output unit 3 that connect successively; Wherein, described filtering protected location 1 is for completing prime protection and the EMI filter function of vehicle power input, formed by overcurrent protection module 101, overvoltage protective module 102, voltage counnter attack protection module 103, π type filtration module 104, reverse voltage, transient voltage are impacted and suppress to eliminate; Described decompression transformation unit 2 becomes constant low voltage signal for completing by the voltage transformation of described filtering protected location 1 output, export to described voltage stabilizing output unit 3, main body is the wide input voltage DC decompression module 201 met the demands, reduce the impact of vehicle-mounted input power fluctuation on rear class, also reduce by the 3 input voltage range requirements of rear class voltage stabilizing output unit simultaneously; Described voltage stabilizing output unit 3, for completing the stable output of system voltage under various disturbed conditions, is comprised of step-up/step-down type dc voltage module 301, energy-storage module 302, discharge prevention module 303.
Be illustrated in figure 2 the preferred embodiment of filtering protected location 1, it comprises thermistor PTC1, two-way TVS diode D1, diode DN1, capacitor C 5, capacitor C 1, capacitor C 2, inductance L 1, inductance L 2, capacitor C 3, capacitor C 4, capacitor C 6, diode D2, diode D3, resistance R 1, resistance R 4, resistance R 5, capacitor C 29, resistance R 2, resistance R 3, triode Q1, capacitor C 7.PTC1 is connected on the power supply input foremost; for overcurrent protection module, according to the equipment concrete condition, to be chosen, the suggestion maximum voltage is 1.25 times of the normal maximum input voltage values of system; the steady-state current value is 2 times of system normal values, should be noted that the impact of temperature on the PTC parameter.According to practical application request, PTC1 also can change fuse into.D1 is two-way overvoltage protective module, terminates between PTC1 and input power ground, according to the equipment concrete condition, is chosen, and proposal action voltage is 1.3 times of left and right of system normal working voltage, and power is that power supply input maximum current is more than 1.6 times.DN1 is voltage counnter attack protection module, according to the equipment concrete condition, is chosen, and the suggestion maximum current is 1.3 times of left and right of system normal working voltage, and reverse voltage is that the maximum input of system negative pressure is more than 1.25 times.C5, C1, C2 and L1, L2 and C3, C4, C5 form one group of π type filtration module, and VDD-to-VSS is carried out to differential mode filtering.Electric capacity and inductance parameters select need to consider to input the interfering frequency characteristic of vehicle power characteristic and system self simultaneously, by frequency, can be estimated according to following formula,
L wherein
dMand C
dMequivalent inductance and electric capacity for filter.
Also have in addition an external power supply alarm for power-off functional circuit in the present embodiment, for when vehicle-mounted external power supply interrupts to system master unit report and alarm.Wherein D2, D3 are anti-reverse protective effect, and R1, R5 form bleeder circuit, and R4 plays metering function, and C29 controls the slow start-up time of Q1, and the input voltage fluctuation of filtering simultaneously disturbs.When the vehicle-mounted voltage of input requires higher than minimum threshold, Q1 opens, and the PWR_IN_DROP signal is low, and when the input vehicle mounted electric forces down in minimum door line, Q1 closes, and the PWR_IN_DROP signal is high.
Be illustrated in figure 3 the preferred embodiment of decompression transformation unit 2, it comprises capacitor C 8, capacitor C 9, inductance L 3, capacitor C 10, C11, decompression DC chip U1, capacitor C 13, diode D4, resistance R 6, capacitor C 18, inductance L 4, resistance R 7, resistance R 8, capacitor C 15, capacitor C 14.C8, C9, L3, C10, C11 form one group of π type filtration module; electric capacity and inductance parameters select need to consider to input the harassing and wrecking frequency characteristic of vehicle power characteristic and decompression DC module self simultaneously, by frequency, can be estimated according to filtering protected location 101 correlation formulas.U1 selects the TPS5430 of TI company of Texas Instrument, and input voltage range 5.5～36V can compatible vehicle-mounted 12V/24V system.C13 is connected across between the BS and PH of U1, and recommendation electric capacity is 0.01uF.D4 is connected across between the PH pin and ground of U1, recommend adoption B340A, forward current 3A, reverse voltage 40V.R6 and C18 form one group of Snubber circuit, and the interference signal produced for absorbing the U1 voltage change process promotes the EMI performance.In this example, R6 is 1.5 Europe, and C18 is 2200pF.R7 and R8 form bleeder circuit, connect the VSENSE pin of U1, for output voltage values is set.L4 is power inductance, and C15 and C14 are output filter capacitor, and parameter is selected to require to determine according to output current characteristic, the output voltage of system.In this example, L4 is 15uH, and C15 is 220uF, and C14 is 0.1uF.
Be illustrated in figure 4 the preferred embodiment of voltage stabilizing output unit 3, it comprises diode D5, resistance R 9, resistance R 10, triode Q2, resistance R 13, diode D6, D7, resistance R 11, resistance R 14, resistance R 17, capacitor C 22, capacitor C 23, capacitor C 27, resistance R 15, capacitor C 26, step-up/step-down type dc chip U2, inductance L 7, magnetic bead L5, capacitor C 24, capacitor C 25, magnetic bead L6, resistance R 12, resistance R 16, capacitor C 19, capacitor C 21, resistance R 22, resistance R 23, resistance R 25, resistance R 26, resistance R 24, resistance R 27, capacitor C 28, resistance R 19, resistance R 20, resistance R 21, metal-oxide-semiconductor Q3.Wherein C resistance R 9, resistance R 10, triode Q2, resistance R 13, diode D6, D7, resistance R 11, resistance R 14, resistance R 17, capacitor C 22, capacitor C 23, capacitor C 27 form energy-storage module.R10 and R13 form bleeder circuit, control the maximum charging current of triode Q2, can be chosen according to the actual requirements.The charging current limiter protection of storage capacitor for R9, can be chosen according to the actual requirements.D6 and D7 are for blocking storage capacitor to live part circuit reverse feeding.C22, C23, C27 are storage capacitor, and R11, R14, R17 form bleeder circuit, balanced C22, C23, C27 charging.C22, C23, C27 can select as required the single super capacitor that withstand voltage is high or change rechargeable battery into.
Diode D5, resistance R 15, capacitor C 26, step-up/step-down type dc chip U2, inductance L 7, inductance L 5, capacitor C 24, capacitor C 25, inductance L 6, resistance R 12, resistance R 16, capacitor C 19, capacitor C 21 form voltage raising and reducing type direct voltage module.In this example, U2 selects the TPS63020 of TI company of Texas Instrument, input voltage range 1.8V～5.5V, and output voltage 1.2V～5.5V, still can guarantee that in the utmost point low input situation output system power supply is stable.R15 pulls down to ground by the PS/SYNC input, make U2 in energy saver mode, only too low when outside vehicle carried power voltage, while causing the output of decompression transformation unit 102 can't meet rear class system power supply input requirements, just work, reduce system power dissipation, promote the EMI performance simultaneously.C26 is connected across between the VINA pin and ground of U2, recommends 0.1uF.D5, for system power supply and energy-storage module input power by output, prevents that system power supply oppositely is input to energy-storage module, causes the system power supply vibration in lower electric process.L5 and L6 are the filtering magnetic bead, for absorbing two-way high-frequency signal harassing and wrecking, can be selected according to system power and characteristic frequency.R12 and R16 form bleeder circuit, connect the FB pin of U2, for output voltage values is set.L7 is power inductance, and C24, C25, C19, C21 are output filter capacitor, and parameter is selected to require to determine according to output current characteristic, the output voltage of system.In this example, L4 is 15uH, and C15 is 220uF, and C14 is 0.1uF.
Resistance R 22, resistance R 23, resistance R 25, resistance R 26, resistance R 24, resistance R 27, capacitor C 28, resistance R 19, resistance R 20, resistance R 21, metal-oxide-semiconductor Q3 form the discharge prevention module.U3 is 2 tunnel input or gate logic chips, and R22, R25 form 1 component volt circuit, and R23, R26 form 1 component volt circuit, as the 2 road input signals of U3.When system works, PWR_PRE and Pwr_contrl signal are height, and U3 is output as height, and the DIS_EN signal is high.U2 chip enable now, in normal operating conditions, Q3 closes, and discharge circuit is not worked, and system power supply PWR_SYS is normal.After outside vehicle electronic circuit falls, the output of U3 is determined by system control signal Pwr_contrl.When the Pwr_contrl signal, while being high, U3 is output as height, and system power supply PWR_SYS is normal.When the Pwr_contrl signal, when low, it is low that U3 is output as, and the DIS_EN signal is low.Now U2 quits work, and Q3 opens, by R19, R20, R21, system power supply PWR_SYS is discharged rapidly, and electricity under completion system.After PWR_IN_DROP signal that system rear class control unit detects filtering protected location 101 is height, the running protection program is carried out relevant treatment, before energy-storage module energy consumption fully, the Pwr_contrl signal is dragged down to the lower electricity of completion system safety.
Vehicle power conversion protective device and implementation method that this example is introduced, be only preferred embodiment of the present utility model, has very large flexibility.Directly at voltage stabilizing output unit 3, adopt the wider step-up/down DC voltage module of input range such as omitting decompression transformation unit 2; Perhaps to part resistance, electric capacity, inductance parameters and software controlling strategies adjustment, can complete corresponding function.For those skilled in the art, can make modification and not change essence of the present utility model and scope above-mentioned execution mode, be equal to replacement and improvement etc., within all belonging to protection range of the present utility model.
Claims (1)
1. a vehicle power conversion protective device, is characterized in that: comprise the filtering protected location (1), decompression transformation unit (2) and the voltage stabilizing output unit (3) that connect successively; Wherein,
Described filtering protected location (1) is for completing prime protection and the EMI filter function of vehicle power input, formed by overcurrent protection module (101), overvoltage protective module (102), voltage counnter attack protection module (103), π type filtration module (104), reverse voltage, transient voltage are impacted and suppress to eliminate;
Described decompression transformation unit (2) becomes constant low voltage signal for completing by the voltage transformation of described filtering protected location (1) output, export to described voltage stabilizing output unit (3), main body is the wide input voltage DC decompression module (201) met the demands, reduce the impact of vehicle-mounted input power fluctuation on rear class, also reduce the requirement of rear class voltage stabilizing output unit input voltage range simultaneously;
Described voltage stabilizing output unit (3), for completing the stable output of system voltage under various disturbed conditions, is comprised of step-up/step-down type dc voltage module (301), energy-storage module (302), discharge prevention module (303).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202991353U CN203339945U (en) | 2013-05-29 | 2013-05-29 | Vehicle-mounted power supply transformation protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013202991353U CN203339945U (en) | 2013-05-29 | 2013-05-29 | Vehicle-mounted power supply transformation protection device |
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| CN203339945U true CN203339945U (en) | 2013-12-11 |
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| CN2013202991353U Expired - Fee Related CN203339945U (en) | 2013-05-29 | 2013-05-29 | Vehicle-mounted power supply transformation protection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393782A (en) * | 2014-11-05 | 2015-03-04 | 沈亚斌 | Single-phase inverter used for high-voltage DC and switching circuit |
| CN105635529A (en) * | 2014-10-30 | 2016-06-01 | 宁波舜宇光电信息有限公司 | Power source device and power supply method of wireless vehicle-mounted reversing camera |
| CN113085731A (en) * | 2021-05-10 | 2021-07-09 | 宁波铝宏汽车零部件有限公司 | Control system and control method for controlling antiglare of vehicle rearview mirror |
-
2013
- 2013-05-29 CN CN2013202991353U patent/CN203339945U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105635529A (en) * | 2014-10-30 | 2016-06-01 | 宁波舜宇光电信息有限公司 | Power source device and power supply method of wireless vehicle-mounted reversing camera |
| CN104393782A (en) * | 2014-11-05 | 2015-03-04 | 沈亚斌 | Single-phase inverter used for high-voltage DC and switching circuit |
| CN113085731A (en) * | 2021-05-10 | 2021-07-09 | 宁波铝宏汽车零部件有限公司 | Control system and control method for controlling antiglare of vehicle rearview mirror |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20170529 |
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| CF01 | Termination of patent right due to non-payment of annual fee |