CN203180502U - Power switch pulse-by-pulse detection protection circuit of vehicle power supply - Google Patents
Power switch pulse-by-pulse detection protection circuit of vehicle power supply Download PDFInfo
- Publication number
- CN203180502U CN203180502U CN2013200463358U CN201320046335U CN203180502U CN 203180502 U CN203180502 U CN 203180502U CN 2013200463358 U CN2013200463358 U CN 2013200463358U CN 201320046335 U CN201320046335 U CN 201320046335U CN 203180502 U CN203180502 U CN 203180502U
- Authority
- CN
- China
- Prior art keywords
- power switch
- circuit
- dsp
- pulse
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a power switch pulse-by-pulse detection protection circuit of a vehicle power supply. The circuit comprises a current detection circuit which is connected in series with a collector electrode of a power switch, a voltage detection circuit which is connected in parallel with the collector electrode and an emitter electrode of the power switch, a DSP, and a drive and control circuit. The current detection circuit and the voltage detection circuit are connected with input ends of the DSP respectively through A/D conversion. PWM signals output by the DSP are connected with an input end of the drive and control circuit. An output end of the drive and control circuit is connected with a grid electrode of the power switch. The DSP is also connected with a display alarm circuit. Through periodic detection of voltage and current variation conditions on two ends of the power switch, the DSP assesses on-off state of the power switch, and an alarm is given out and the power switch is protected before the power switch goes wrong. The circuit overcomes problems that an existing detection method has long delay and cannot perform effective protection, thereby preventing serious consequences caused by damages of the power switch.
Description
Technical field
The utility model relates to vehicular communication equipment power supply field, and the power switch Pulse by Pulse that is specifically related to a kind of vehicle power rack detects protective circuit.
Background technology
Accuse that the electronic equipment of installing in the system communication car is more, the power supply stability of power-supply device, reliability, operation ease etc. have been proposed very high requirement, in case power-supply device breaks down, will influence the work of all electronic equipments, cause serious consequence.Many power switchs are arranged in the vehicle power rack, be mainly used in circuit of power factor correction, direct current DC transfer circuit and direct current ac converter circuit etc.In a single day power switch breaks down, and gently then causes the power supply cabinet no-output, and power supply cabinet institute carrying device can't operate as normal, when serious even can cause that circuit board burns, the tripping operation of communication truck power supply ancient piece of jade, round, flat and with a hole in its centre box causes catastrophe failures such as car load power failure.Therefore, the generation of the prevention serious accident of how before power switch breaks down, adopting an effective measure, tool has very important significance.
The utility model content
The purpose of this utility model is to provide a kind of power switch Pulse by Pulse of vehicle power to detect protective circuit; overcome the time delay that existing electric current, average voltage or effective value detection method exist long, can not cut off the protection Problem of Failure that driving pulse brings in the very first time of breaking down, working stability is reliable, convenient for installation and maintenance.
The utility model is to be achieved through the following technical solutions:
A kind of power switch Pulse by Pulse of vehicle power detects protective circuit, comprises the current detection circuit of connecting with the collector electrode of described power switch, voltage detecting circuit, DSP, the Drive and Control Circuit in parallel with the collector and emitter of described power switch; Described current detection circuit is connected with the input of DSP by A/D conversion back respectively with voltage detecting circuit, the pwm signal of described DSP output is connected with the input of Drive and Control Circuit, the output of described Drive and Control Circuit is connected with the grid of described power switch, also is connected with the display alarm circuit on the described DSP.
The beneficial effects of the utility model:
The utility model is mainly used in the power-supply system in the various communication trucks; the voltage at cycle detection power switch two ends, electric current situation of change; DSP is, and the power switch state is assessed; before power switch breaks down, alarm and take effective protection measure, prevent that the power switch damage from having serious consequences.Satisfy working stability requirement reliable, convenient for installation and maintenance.
Description of drawings
Fig. 1 desirable electric current, voltage oscillogram when being the power switch operate as normal;
Fig. 2 is the power switch state-detection schematic diagram among the utility model embodiment.
Embodiment
By reference to the accompanying drawings shown in 1,2, a kind of power switch Pulse by Pulse of vehicle power detects protective circuit, comprises the current detection circuit of connecting with the collector electrode of described power switch, voltage detecting circuit, DSP, the Drive and Control Circuit in parallel with the collector and emitter of described power switch; Described current detection circuit is connected with the input of DSP by A/D conversion back respectively with voltage detecting circuit, the pwm signal of described DSP output is connected with the input of Drive and Control Circuit, the output of described Drive and Control Circuit is connected with the grid of described power switch, also is connected with the display alarm circuit on the described DSP.The DSP that the utility model adopts is the digital signal processor TMS320F2812 of TI company, current detection circuit adopts Hall current sensor, model is CHB-100SF/SP2, the model that voltage detection module adopts DFROBOT company to produce is the voltage detection module of DFR0051, pwm signal then is by the task manager generation of DSP inside, exports by its GPIOA port.
V among Fig. 1
gBe power switch grid (or base stage) drive pulse waveform, v
CeBe power switch collector and emitter both end voltage waveform, i
cBe power switch collector current waveform.As can be seen from Figure 1, under the power switch normal condition, when its grid (or base stage) driving pulse voltage is V
mThe time, power switch is in conducting state, and collector and emitter voltage is zero, and collector current is I
p(its size is determined by factors such as translation circuit operating voltage, load, voltage topological structure, the pressure drops of power switch saturation conduction); When power switch grid (or base stage) driving pulse was zero, power switch was in cut-off state, and collector and emitter voltage is V
d(its size is determined by factors such as translation circuit operating voltage, voltage topological structure, the pressure drops of power switch saturation conduction), collector current are zero.
Fig. 2 is example with modal full bridge power translation circuit, comprise four power switch T1-T4, the current detection circuit of connecting with each power switch, the voltage detecting circuit in parallel with each power switch, DSP, Drive and Control Circuit and display alarm circuit are formed; Current detection circuit and voltage detecting circuit are for detection of the size of the electric current that flows through power switch and both end voltage thereof, be converted into digital signal and send into DSP by the A/D conversion, DSP is the kernel control chip of whole technical proposal herein, it is responsible for producing the PWM control impuls of four power switchs, this PWM control impuls send into Drive and Control Circuit amplify and isolate after send into the grid of four power switch pipes again.Simultaneously, DSP starts the A/D conversion in each switch periods, and readout power switching voltage and current value compare the state of judging power switch afterwards with standard value.
When power switch is in conducting state, the power switch both end voltage greater than 3V or the electric current that flows through less than I
p/ 2, when power switch was in cut-off state, the power switch both end voltage was less than 2V
d/ 3 or the electric current that flows through greater than 0.5A, then be judged to be the power switch pipe fault, this moment, DSP blocked driving pulse immediately, and carried out audible and visual alarm by the display alarm circuit.
When real work, be subjected to the power switch operating frequency, influences such as circuit parasitic parameter, actual waveform figure and Fig. 1 be difference to some extent, for example voltage oscillogram can exist rising edge that certain gradient is arranged, overshoot and concussion etc. are arranged in the uphill process, there are situations such as rising edge is gradient too in current waveform figure, influence for fear of these factors, when carrying out the software design, DSP is synchronizing signal with the rising and falling edges of power switch tube drives pulse, according to the operating frequency of power switch, restart the A/D conversion after time-delay 1/10th switch periods, and use software filtering to eliminate above-mentioned influence.
Above-described only is preferred implementation of the present utility model; should be understood that; for a person skilled in the art; under the prerequisite that does not break away from the utility model structure; can also make some distortion and improvement; these also should be considered as protection range of the present utility model, and these can not influence effect and practical applicability that the utility model is implemented.
Claims (1)
1. the power switch Pulse by Pulse of a vehicle power detects protective circuit, comprises the current detection circuit of connecting with the collector electrode of described power switch, voltage detecting circuit, DSP, the Drive and Control Circuit in parallel with the collector and emitter of described power switch; It is characterized in that: described current detection circuit is connected with the input of DSP by A/D conversion back respectively with voltage detecting circuit, the pwm signal of described DSP output is connected with the input of Drive and Control Circuit, the output of described Drive and Control Circuit is connected with the grid of described power switch, also is connected with the display alarm circuit on the described DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200463358U CN203180502U (en) | 2013-01-29 | 2013-01-29 | Power switch pulse-by-pulse detection protection circuit of vehicle power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200463358U CN203180502U (en) | 2013-01-29 | 2013-01-29 | Power switch pulse-by-pulse detection protection circuit of vehicle power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203180502U true CN203180502U (en) | 2013-09-04 |
Family
ID=49077162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200463358U Withdrawn - After Issue CN203180502U (en) | 2013-01-29 | 2013-01-29 | Power switch pulse-by-pulse detection protection circuit of vehicle power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203180502U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267642B (en) * | 2014-09-26 | 2017-02-22 | 浙江中控技术股份有限公司 | System and method for outputting reliable current signals |
-
2013
- 2013-01-29 CN CN2013200463358U patent/CN203180502U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267642B (en) * | 2014-09-26 | 2017-02-22 | 浙江中控技术股份有限公司 | System and method for outputting reliable current signals |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202837494U (en) | Contactor state inspection device | |
| CN103208782A (en) | Comprehensive detection and electric protection device for power frequency and variable frequency power supplies | |
| CN203026906U (en) | Resettable over-voltage and under-voltage protector | |
| CN105929220A (en) | Over-current detection circuit | |
| CN203774784U (en) | Bus anti-reversed wiring protection circuit of photovoltaic inverter | |
| CN203180502U (en) | Power switch pulse-by-pulse detection protection circuit of vehicle power supply | |
| CN103366460A (en) | Circuit breaker for prepaid electric meter | |
| CN103308755A (en) | Insulation testing device and method for high-voltage direct-current remote power supply system | |
| CN204835502U (en) | Converter main relay fail safe circuit | |
| CN203513016U (en) | Power supply open-phase protection device of lift control cabinet | |
| CN204331971U (en) | A kind of can the electric fire monitoring device of monitoring current mutual inductor connection status | |
| CN205304217U (en) | Cross undervoltage protection ware | |
| CN202978236U (en) | Current limiting protection circuit of AC current of photovoltaic inverter | |
| CN203596728U (en) | High voltage frequency converter power unit machinery bypass device | |
| CN203276459U (en) | Electrical fire monitoring detector having overvoltage under-voltage detecting and protective functions | |
| CN203632351U (en) | Double-power-source switching device | |
| CN202710647U (en) | Monitoring device for direct current system | |
| CN201877795U (en) | Timed current-limiting protection circuit | |
| CN204464947U (en) | A kind of signal sampling device be applied on phase-defect protection circuit breaker off zero | |
| CN204304617U (en) | Power monitoring circuit protective device | |
| CN204424883U (en) | A kind of Intelligent over voltage limiter being applicable to LPZOB region | |
| CN203326583U (en) | Monitoring and protecting device of electric power device | |
| CN203151135U (en) | Lighting-proof EPS emergency power supply | |
| CN203233148U (en) | Comprehensive detection and power utilization protection device of power frequency and variable-frequency power supply | |
| CN201910781U (en) | Fire-fighting linkage conversion device with various input ports |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANDONG WEIGU INFORMATION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: CHONGQING COMMUNICATION COLLEGE OF THE CHINA PLA Effective date: 20140828 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 400030 SHAPINGBA, CHONGQING TO: 261205 WEIFANG, SHANDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140828 Address after: 261205 Shandong Province, Weifang high tech Zone in North Road, street health Weixian East Software Park, the city of the World Trade Center (health Street No. 10178) A room 1001 Patentee after: SHANDONG WEIGU INFORMATION TECHNOLOGY CO., LTD. Address before: 400030 No. 1, Lin Yuan, Shapingba District, Chongqing Patentee before: Chongqing Communication College of the China PLA |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160923 Address after: 401122 Chongqing city in northern New Area of the Open Road West No. 106 11 floor of Building 2 room 1 A4 District No. 1~8 Patentee after: Chongqing solid Mdt InfoTech Ltd Address before: 261205 Shandong Province, Weifang high tech Zone in North Road, street health Weixian East Software Park, the city of the World Trade Center (health Street No. 10178) A room 1001 Patentee before: SHANDONG WEIGU INFORMATION TECHNOLOGY CO., LTD. |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130904 Effective date of abandoning: 20200330 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130904 Effective date of abandoning: 20200330 |