CN203206116U - Wide voltage input circuit - Google Patents
Wide voltage input circuit Download PDFInfo
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- CN203206116U CN203206116U CN 201320165497 CN201320165497U CN203206116U CN 203206116 U CN203206116 U CN 203206116U CN 201320165497 CN201320165497 CN 201320165497 CN 201320165497 U CN201320165497 U CN 201320165497U CN 203206116 U CN203206116 U CN 203206116U
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Abstract
A wide voltage input circuit comprises a DC-DC voltage reduction voltage-stablizer and a voltage control circuit that matches a predetermined voltage range of the DC-DC voltage reduction voltage-stablizer. The input end of the voltage control circuit is connected with the positive pole of an input voltage, and the output end of the voltage control circuit is connected with the input end of the DC-DC voltage reduction voltage-stablizer. Through the above wide voltage input circuit, the voltage control circuit is additionally arranged to effectively control the input voltage of the DC-DC voltage reduction voltage-stablizer, and the voltage control circuit that matches the predetermined voltage range of the DC-DC voltage reduction voltage-stablizer can also be selected according to concrete input voltages, so that voltage limiting capabilities of the wide voltage input circuit are better improved and stable voltages can be effectively output by the wide voltage input circuit.
Description
Technical field
The utility model relates to the power supply circuits field, particularly relates to a kind of wide voltage input circuit.
Background technology
When electric supply installation is powered, often because the unstable overtension that causes of voltage will be burnt, cross the low troublesome problem that can not run well again, the electrical equipment that therefore is fit to wide voltage is more energy-conservation, durable than common.
The input circuit of general wide voltage, thereby just by before the voltage access, reach the purpose of step-down stable output voltage by the lowering and stabilizing blood pressure pipe, still can work in the situation of the spread of voltage of the input circuit of this wide voltage among a small circle, but in the peaked situation that the peak value of voltage fluctuation can bear greater than the lowering and stabilizing blood pressure pipe, probably cause the lowering and stabilizing blood pressure pipe to burn, and then burn other electrical equipment, the input circuit pressure limiting ability of so wide voltage is lower.
The utility model content
Based on this, be necessary the low problem of input circuit pressure limiting ability for existing wide voltage, the input circuit of the higher wide voltage of a kind of pressure limiting ability is provided.
A kind of wide voltage input circuit comprises DC-DC voltage-releasing voltage stabilizer and the voltage control circuit that is complementary with the predetermined voltage range of described DC-DC voltage-releasing voltage stabilizer; The input of described voltage control circuit connects the positive pole of input voltage, and the output of described voltage control circuit connects the input of described DC-DC voltage-releasing voltage stabilizer.
Among embodiment, described wide voltage input circuit, described voltage control circuit comprise IC chip, field effect transistor, resistance R l and resistance R 2 therein; To connect input voltage anodal with being connected the drain electrode of SHDN pin and described field effect transistor for the IN pin of described IC chip, described IC chip GATE pin connects the grid of described field effect transistor, described resistance R l is parallel between the OUTB pin and OVSET pin of described IC chip, one end of described resistance R 2 connects the OVSET pin of described IC chip, the other end ground connection of described resistance R 2, described resistance R l be connected the source electrode of field effect transistor and connect described DC-DC voltage-releasing voltage stabilizer input.
Among embodiment, described wide voltage input circuit, described voltage control circuit also comprise the electric capacity that is parallel between described IC chip OUTB pin and the OVSET pin therein.
Among embodiment, described wide voltage input circuit, described DC-DC voltage-releasing voltage stabilizer are that predetermined voltage range is the DC-DC voltage-releasing voltage stabilizer of 6-40V therein.
Among embodiment, described wide voltage input circuit comprises that also an end ground connection one end connects the electric capacity of described voltage control circuit output therein.
Above-mentioned wide voltage input circuit, the input of described voltage control circuit connects the positive pole of input voltage, and the output of described voltage control circuit connects the input of described DC-DC voltage-releasing voltage stabilizer.Input voltage can access by the input of voltage control circuit wide voltage input circuit, through described voltage control circuit pressure limiting, the maximum output of deboost is not more than the maximum voltage that can bear of described DC-DC voltage-releasing voltage stabilizer, guarantee that described DC-DC voltage-releasing voltage stabilizer can not be burned, described DC-DC voltage-releasing voltage stabilizer carries out step-down to voltage again, control stable output voltage.Effectively control the input voltage of described DC-DC voltage-releasing voltage stabilizer by increasing voltage control circuit, the voltage control circuit that can also be complementary according to the predetermined voltage range of concrete input voltage selection and described DC-DC voltage-releasing voltage stabilizer, better improve the pressure limiting ability of wide voltage input circuit, effectively guaranteed the voltage of wide voltage input circuit stable output.
Description of drawings
Fig. 1 is the wherein circuit module connection layout of a kind of embodiment of wide voltage input circuit;
Fig. 2 is the voltage control circuit circuit module figure of a kind of embodiment wherein in the wide voltage input circuit;
Fig. 3 is the wherein circuit diagram of another kind of embodiment of wide voltage input circuit;
Fig. 4 is the voltage control circuit circuit module figure of another kind of embodiment wherein in the wide voltage input circuit.
Embodiment
As shown in Figure 1, a kind of wide voltage input circuit comprises DC-DC voltage-releasing voltage stabilizer 110 and the voltage control circuit 120 that is complementary with the predetermined voltage range of described DC-DC voltage-releasing voltage stabilizer 110; The input of described voltage control circuit 120 connects the positive pole of input voltage, and the output of described voltage control circuit 120 connects the input of described DC-DC voltage-releasing voltage stabilizer 110.
In the present embodiment, can select in advance according to concrete power supply needs the model of DC-DC voltage-releasing voltage stabilizer 110, take the input voltage of described DC-DC voltage-releasing voltage stabilizer 110 require as 6-40V as example, the input of described voltage control circuit 120 connects the positive pole of input voltage, if the voltage of the input of voltage control circuit 120 input is greater than being 45V, the lower voltage that voltage control circuit 120 can be inputted the input of voltage control circuit 120 is below 40V, guarantee that the input access voltage of described DC-DC voltage-releasing voltage stabilizer 110 is no more than the highest magnitude of voltage that bears of described DC-DC voltage-releasing voltage stabilizer 110, guarantee that described DC-DC voltage-releasing voltage stabilizer 110 normally moves, described DC-DC voltage-releasing voltage stabilizer 110 carries out the lowering and stabilizing blood pressure processing with the voltage of its input input, guarantee the predetermined voltage of stable output, described predetermined voltage can be 5V.
Above-mentioned wide voltage input circuit, the input of described voltage control circuit connects the positive pole of input voltage, and the output of described voltage control circuit connects the input of described DC-DC voltage-releasing voltage stabilizer.Input voltage can access by the input of voltage control circuit wide voltage input circuit, through described voltage control circuit pressure limiting, the maximum output of deboost is not more than the maximum voltage that can bear of described DC-DC voltage-releasing voltage stabilizer, guarantee that described DC-DC voltage-releasing voltage stabilizer can not be burned, described DC-DC voltage-releasing voltage stabilizer carries out step-down to voltage again, control stable output voltage.Effectively control the input voltage of described DC-DC voltage-releasing voltage stabilizer by increasing voltage control circuit, the voltage control circuit that can also be complementary according to the predetermined voltage range of concrete input voltage selection and described DC-DC voltage-releasing voltage stabilizer, better improve the pressure limiting ability of wide voltage input circuit, effectively guaranteed the voltage of wide voltage input circuit stable output.
As shown in Figure 2, among embodiment, described wide voltage input circuit, described voltage control circuit comprise IC chip, field effect transistor, resistance R l and resistance R 2 therein; Described IC chip comprise the IN pin ,/SHDN pin, GATE pin, OUTB pin, OVSET pin and be used for two GND pin of ground connection.To connect input voltage anodal with being connected the drain electrode of SHDN pin and described field effect transistor for the IN pin of described IC chip, described IC chip GATE pin connects the grid of described field effect transistor, described resistance R l is parallel between the OUTB pin and OVSET pin of described IC chip, one end of described resistance R 2 connects the OVSET pin of described IC chip, the other end ground connection of described resistance R 2, described resistance R l be connected the source electrode of field effect transistor and connect described DC-DC voltage-releasing voltage stabilizer input.
In the present embodiment, described IC chip, field effect transistor, the resistance R l circuit of being connected with resistance R connects the overvoltage thresholding that can set by the resistance of selecting resistance R l and Rl described DC-DC voltage-releasing voltage stabilizer.System quits work when described voltage control circuit input voltage is lower than the minimum operating voltage of described DC-DC voltage-releasing voltage stabilizer, can not cause any damage by circuit itself.When input voltage is higher than the overvoltage thresholding of described DC-DC voltage-releasing voltage stabilizer of setting, the GATE pin output gear ripple of described IC chip is controlled the on-state rate of described field effect transistor, the GATE pin output gear ripple of described IC chip is to the grid of described field effect transistor, utilize the on state characteristic of field effect transistor to control the on-state rate of described field effect transistor, by controlling the on-state rate of described field effect transistor, reach the overvoltage thresholding that the restriction load voltage is no more than the described DC-DC voltage-releasing voltage stabilizer of setting, to satisfy the voltage range of described DC-DC voltage-releasing voltage stabilizer.As shown in Figure 3, described IC chip can be MAX6495 chip U0604 in the present embodiment, described DC-DC voltage-releasing voltage stabilizer can be the DC-DC voltage-releasing voltage stabilizer that comprises the LT369OEUFE chip, then the requirement of the input voltage of described DC-DC voltage-releasing voltage stabilizer is 6-40V, so the output voltage of described voltage control circuit can not surpass 40V, can be that the R0653 that 680 kilo-ohms resistance R 0652 and resistance are 28 kilo-ohms sets its overvoltage thresholding by resistance, be set as 38V in the present embodiment, the surplus that keeps 2V can be used as the buffer area that the surplus that keeps 2V can be used as voltage fluctuation.
As shown in Figure 4, among embodiment, described wide voltage input circuit, described voltage control circuit also comprise the electric capacity that is parallel between described IC chip OUTB pin and the OVSET pin therein.According to the characteristic of electric capacity, be parallel to the electric capacity between described IC chip OUTB pin and the OVSET pin, can stablize the output voltage fluctuation of described voltage control circuit, guarantee the stable of described voltage control circuit output voltage.
Among embodiment, described wide voltage input circuit, described DC-DC voltage-releasing voltage stabilizer are that predetermined voltage range is the DC-DC voltage-releasing voltage stabilizer of 6-40V therein.In the present embodiment, can select according to concrete power demands the voltage range of described DC-DC voltage-releasing voltage stabilizer, specifically can determine according to the chip that described DC-DC voltage-releasing voltage stabilizer adopts, preferred predetermined voltage range is the DC-DC voltage-releasing voltage stabilizer of 6-40V in the present embodiment.
Among embodiment, described wide voltage input circuit comprises that also an end ground connection one end connects the electric capacity of described voltage control circuit output therein.Described electric capacity can carry out filtering to described voltage control circuit to be processed.As shown in Figure 3, described IC chip can be the MAX6495 chip in the present embodiment, described DC-DC voltage-releasing voltage stabilizer can be the DC-DC voltage-releasing voltage stabilizer that comprises the LT369OEUFE chip, and then preferred capacitor C 0608 is 470uF, and preferred capacitor C 0609 is 22OnF.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (5)
1. a wide voltage input circuit is characterized in that, comprises DC-DC voltage-releasing voltage stabilizer and the voltage control circuit that is complementary with the predetermined voltage range of described DC-DC voltage-releasing voltage stabilizer; The input of described voltage control circuit connects the positive pole of input voltage, and the output of described voltage control circuit connects the input of described DC-DC voltage-releasing voltage stabilizer.
2. wide voltage input circuit according to claim 1 is characterized in that, described voltage control circuit comprises IC chip, field effect transistor, resistance R l and resistance R 2; To connect input voltage anodal with being connected the drain electrode of SHDN pin and described field effect transistor for the IN pin of described IC chip, described IC chip GATE pin connects the grid of described field effect transistor, described resistance R l is parallel between the OUTB pin and OVSET pin of described IC chip, one end of described resistance R 2 connects the OVSET pin of described IC chip, the other end ground connection of described resistance R 2, described resistance R l be connected the source electrode of field effect transistor and connect described DC-DC voltage-releasing voltage stabilizer input.
3. wide voltage input circuit according to claim 2 is characterized in that, described voltage control circuit also comprises the electric capacity that is parallel between described IC chip OUTB pin and the OVSET pin.
4. wide voltage input circuit according to claim 1 and 2 is characterized in that, described DC-DC voltage-releasing voltage stabilizer is that predetermined voltage range is the DC-DC voltage-releasing voltage stabilizer of 6-40V.
5. wide voltage input circuit according to claim 1 and 2 is characterized in that, comprises that also an end ground connection one end connects the electric capacity of described voltage control circuit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320165497 CN203206116U (en) | 2013-04-03 | 2013-04-03 | Wide voltage input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320165497 CN203206116U (en) | 2013-04-03 | 2013-04-03 | Wide voltage input circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203206116U true CN203206116U (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320165497 Expired - Fee Related CN203206116U (en) | 2013-04-03 | 2013-04-03 | Wide voltage input circuit |
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| CN (1) | CN203206116U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915051A (en) * | 2016-04-15 | 2016-08-31 | 上海交通大学 | Dual buck converter of pre-posed buck current-doubling circuit |
-
2013
- 2013-04-03 CN CN 201320165497 patent/CN203206116U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915051A (en) * | 2016-04-15 | 2016-08-31 | 上海交通大学 | Dual buck converter of pre-posed buck current-doubling circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 |
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| CF01 | Termination of patent right due to non-payment of annual fee |