CN205178879U - DC power supply with wide input voltage range - Google Patents
DC power supply with wide input voltage range Download PDFInfo
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- CN205178879U CN205178879U CN201521009799.7U CN201521009799U CN205178879U CN 205178879 U CN205178879 U CN 205178879U CN 201521009799 U CN201521009799 U CN 201521009799U CN 205178879 U CN205178879 U CN 205178879U
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Abstract
The utility model relates to a DC power supply with wide input voltage range. DC power supply includes the DC -DC module, connects overvoltage protection module and undervoltage protection module at DC -DC module input. The overvoltage protection module is used for when high -pressure surge appears in DC -DC module input, with the within range of surge voltage restriction in the permission, the undervoltage protection module is used for providing normal work required power supply voltage for the DC -DC module when input voltage falls. The utility model discloses adopting overvoltage crowbar and undervoltage protection circuit simultaneously, can effectively restraining high -pressure surge, the system that can guarantee when input voltage obviously reduces again normally works to input voltage's scope has been widened greatly. The utility model discloses an overvoltage crowbar include transient state surge snubber circuit and surge energy snubber circuit, not only can effectively eliminate narrower surge pulse, can also effectively restrain the wide surge voltage's of second level the impacts even of tens of millisecond.
Description
Technical field
The utility model belongs to DC power supply field, relates to the DC power supply that a kind of input voltage range is very wide.
Background technology
Along with the develop rapidly of electronic technology, power transfer module is more and more extensive in the application of electronic equipment, and forms standard product gradually.But have much special applied environment, traditional standardization DC-DC module is difficult to the needs meeting client.Such as in some military airborne or mobile units, 24V input voltage is very unstable, and input voltage can drop to 8V even 6V sometimes, and input voltage has the instantaneous high pressure surge of hectovolt sometimes.And the DC-DC module input range of the 24V of standard is 9-36V on market, when input voltage is too low, system-down will be caused; When input voltage is too high, likely damage power supply.
Authorization Notice No. is that the utility model patent of CN203206116U discloses a kind of Width funtion input circuit, the voltage control circuit comprising DC-DC voltage-releasing voltage stabilizer and match with the predetermined voltage range of described DC-DC voltage-releasing voltage stabilizer.This circuit effectively can suppress the surge voltage of input thus improve input voltage range; its defect to improve the maximum input voltage of system permission; can not reduce minimum input voltage, when input voltage is too low, system still can cause because Power supply is not enough shutting down.
Utility model content
In order to solve the above-mentioned problems in the prior art, the utility model proposes a kind of Width funtion input power.This power supply can the occasion of flexible Application under complicated input environment, effectively can suppress high voltage surge, can ensure system worked well again, thus greatly broaden the scope of input voltage when input voltage obviously reduces.
To achieve these goals, the utility model adopts following technical scheme:
There is a DC power supply for wide input voltage range, comprise DC-DC module, also comprise the overvoltage protective module and under-voltage protective module that are connected to described DC-DC module input.Wherein,
Described DC-DC module is for exporting one or more groups direct voltage.
Surge voltage, for suppressing high voltage surge voltage, when high voltage surge appears in described DC-DC module input, limits in allowed limits by described overvoltage protective module.
Described under-voltage protective module is used for when input terminal voltage falls for described DC-DC module provides the supply power voltage of normal work.
Further, described overvoltage protective module comprises electrical surge absorbing circuit, surge energy absorbing circuit and control electrical appliances for electric charge pump.Described electrical surge absorbing circuit is for absorbing the pulse of Microsecond grade electrical surge, and described surge energy absorbing circuit is made up of power tube, under described control electrical appliances for electric charge pump effect, absorb most of surge energy.
Further, described electrical surge absorbing circuit is the piezo-resistance or the Transient Suppression Diode that are connected in parallel on input power two ends.
Further, the power tube in described surge energy absorbing circuit is field effect transistor Q1 and Q2.The drain electrode of Q1 connects input power positive pole, and the grid of Q1 connects the drain electrode of Q2, and the source electrode of Q2 is by a grounding through resistance, and the output of described control electrical appliances for electric charge pump provides bias voltage by the grid that detecting circuit is Q2.When electrical surge appears in the drain electrode of Q1, Q1 is biased into source electrode follow the mode, and most of surge energy is absorbed by Q2, and the source electrode of Q1 exports the power supply after suppressing surge to DC-DC module.
Preferably, described control electrical appliances for electric charge pump comprises a pulse oscillation circuit.
Further, described under-voltage protective module comprises input monitoring circuit, booster circuit and output control circuit.Described input monitoring circuit operation when input power is reduced to set threshold value, control described booster circuit work, the power supply of described DC-DC module is switched to the output of described booster circuit by described output control circuit by input power.
Compared with the prior art, the utility model has the following advantages:
The utility model adopts overvoltage crowbar and under-voltage protecting circuit simultaneously, effectively can suppress high voltage surge, can ensure system worked well again, thus greatly broaden the scope of input voltage when input voltage obviously reduces.
The overvoltage crowbar that the utility model adopts comprises electrical surge absorbing circuit and surge energy absorbing circuit; effectively can not only eliminate the narrower surge pulse of Microsecond grade; absorb most of surge energy by surge energy absorbing circuit, can also effectively suppress several ms even second level the impact of wide surge voltage.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of DC power supply circuit described in the utility model;
The composition frame chart of the overvoltage protective module of Fig. 2 involved by embodiment;
The composition frame chart of the under-voltage protective module of Fig. 3 involved by embodiment.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
Have a DC power supply for wide input voltage range, composition frame chart as shown in Figure 1, comprises the overvoltage protective module, under-voltage protective module and the DC-DC module that are connected successively.
1.DC-DC module
DC-DC module is used for the higher direct voltage lower DC input voitage being converted to system needs.Many group direct voltages can be provided to be different circuit supplies by choosing polylith DC-DC module simultaneously.
According to output voltage needs, conventional DC-DC module can be selected flexibly.
2. overvoltage protective module
Surge voltage, for suppressing the high voltage surge voltage appearing at input supply terminal, when high voltage surge appears in input power, limits in allowed limits by overvoltage protective module.
Overvoltage protective module comprises electrical surge absorbing circuit, surge energy absorbing circuit and control electrical appliances for electric charge pump.Fig. 2 gives the composition frame chart of overvoltage protective module.
Electrical surge absorbing circuit is the piezo-resistance or the Transient Suppression Diode that are connected in parallel on input power two ends, for absorbing the pulse of Microsecond grade electrical surge.
Surge energy absorbing circuit sponges most of surge energy under control electrical appliances for electric charge pump effect.Surge energy absorbing circuit forms primarily of power tube, and that the present embodiment adopts is field effect transistor Q1 and Q2, and as shown in Figure 2, the drain electrode of Q1 connects input power positive pole, and the grid of Q1 connects the drain electrode of Q2, and the source electrode of Q2 is by a grounding through resistance.The output of control electrical appliances for electric charge pump provides bias voltage by the grid that detecting circuit is Q2.When electrical surge appears in the drain electrode of Q1, Q1 is biased into source electrode follow the mode, and most of surge energy is absorbed by Q2, and the source electrode of Q1 exports the power supply after suppressing surge to DC-DC module.
Control electrical appliances for electric charge pump forms primarily of a pulse oscillation circuit, the pulse oscillation circuit that what the present embodiment adopted is is core with 555 chips, and it exports the grid of pulse for Q2 after peak detection and provides bias voltage.By the size of the output of control electrical appliances for electric charge pump adjustment Q2 grid voltage, thus controls Q2 from Q1 " plunder " electric charge number (absorption surge number), " charge pump " therefore gains the name.
Traditional anti-surge circuit, just at input passive devices more in parallel, such as piezo-resistance or Transient Suppression Diode TVS.These passive devices generally can only absorb the low-energy surge voltage that width is Microsecond grade, when there is the long-term surge of several milliseconds or upper second, above-mentioned passive device may burn, thus causes the DC-DC module of burning below even to burn the system be powered.The utility model increases the active surge energy absorbing circuit of one-level, absorbs most of energy of high voltage surge, can realize the surge protection of below level second.
3. under-voltage protective module
Under-voltage protective module comprises input monitoring circuit, booster circuit and output control circuit.When input power is reduced to set threshold value, input monitoring circuit operation, control signal controls booster circuit work.Meanwhile, output control circuit exports control signal and cuts off former input power, using the power supply of the output of input booster circuit as DC-DC module.
Input monitoring circuit and output control circuit form primarily of comparator circuit.
The implementation method of booster circuit is a lot, can require to select different boost chip, as LT3787 according to embody rule.
Traditional under-voltage protecting circuit is all generally increase electric capacity or reserce cell.Very large inrush current can be produced during this design start, thus affect whole electric power system.And holding capacitor voltage also can only be the same with input voltage, the discharge time of electric capacity can be very short, thus cause the overall volume of power supply excessive.Voltage is raised to the highest limit by booster circuit by the utility model, effectively can reduce the volume of equipment.And the impulse current produced during by arranging input monitoring circuit and effectively reducing startup.
The utility model is not limited to above-mentioned execution mode, those skilled in the art make to any apparent improvement of above-mentioned execution mode or change, all can not exceed the protection range of design of the present utility model and claims.
Claims (6)
1. have a DC power supply for wide input voltage range, it is characterized in that, described DC power supply comprises DC-DC module, is connected to overvoltage protective module and the under-voltage protective module of described DC-DC module input; Wherein,
Described DC-DC module is for exporting one or more groups direct voltage;
Described overvoltage protective module is used for when high voltage surge appears in described DC-DC module input, by surge voltage restriction in allowed limits;
Described under-voltage protective module is used for when input terminal voltage falls for described DC-DC module provides the supply power voltage of normal work.
2. the DC power supply with wide input voltage range according to claim 1, described overvoltage protective module comprises electrical surge absorbing circuit, surge energy absorbing circuit and control electrical appliances for electric charge pump; Described electrical surge absorbing circuit is for absorbing the pulse of Microsecond grade electrical surge, and described surge energy absorbing circuit is made up of power tube, under described control electrical appliances for electric charge pump effect, absorb most of surge energy.
3. the DC power supply with wide input voltage range according to claim 2, described electrical surge absorbing circuit is the piezo-resistance or the Transient Suppression Diode that are connected in parallel on input power two ends.
4. the DC power supply with wide input voltage range according to claim 2, the power tube in described surge energy absorbing circuit is field effect transistor Q1 and Q2; The drain electrode of Q1 connects input power positive pole, and the grid of Q1 connects the drain electrode of Q2, and the source electrode of Q2 is by a grounding through resistance, and the output of described control electrical appliances for electric charge pump provides bias voltage by the grid that detecting circuit is Q2; When electrical surge appears in the drain electrode of Q1, Q1 is biased into source electrode follow the mode, and most of surge energy is absorbed by Q2, and the source electrode of Q1 exports the power supply after suppressing surge to DC-DC module.
5. the DC power supply with wide input voltage range according to claim 2 or 4, described control electrical appliances for electric charge pump comprises a pulse oscillation circuit.
6. the DC power supply with wide input voltage range according to claim 1, described under-voltage protective module comprises input monitoring circuit, booster circuit and output control circuit; Described input monitoring circuit operation when input power is reduced to set threshold value, control described booster circuit work, the power supply of described DC-DC module is switched to the output of described booster circuit by described output control circuit by input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521009799.7U CN205178879U (en) | 2015-12-08 | 2015-12-08 | DC power supply with wide input voltage range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521009799.7U CN205178879U (en) | 2015-12-08 | 2015-12-08 | DC power supply with wide input voltage range |
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| Publication Number | Publication Date |
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| CN205178879U true CN205178879U (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521009799.7U Active CN205178879U (en) | 2015-12-08 | 2015-12-08 | DC power supply with wide input voltage range |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658858A (en) * | 2017-09-26 | 2018-02-02 | 惠州市德赛西威汽车电子股份有限公司 | A kind of Vehicular power protective circuit |
-
2015
- 2015-12-08 CN CN201521009799.7U patent/CN205178879U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658858A (en) * | 2017-09-26 | 2018-02-02 | 惠州市德赛西威汽车电子股份有限公司 | A kind of Vehicular power protective circuit |
| CN107658858B (en) * | 2017-09-26 | 2019-05-17 | 惠州市德赛西威汽车电子股份有限公司 | A kind of Vehicular power protective circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |