CN204668914U - Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off - Google Patents
Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off Download PDFInfo
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- CN204668914U CN204668914U CN201520320883.4U CN201520320883U CN204668914U CN 204668914 U CN204668914 U CN 204668914U CN 201520320883 U CN201520320883 U CN 201520320883U CN 204668914 U CN204668914 U CN 204668914U
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Abstract
The utility model discloses a kind of isolation DC/DC power supply input undervoltage or power-off guarantor Electricity Functional device, comprise the first threshold circuit be connected with the input voltage of DC-DC power source and the second threshold circuit be connected with input power; Bleeder circuit that series resistance forms is included and a mos manages in first threshold circuit and the second threshold circuit; Bleeder circuit top is connected respectively input voltage and the input power of DC-DC power source, bleeder circuit end ground connection; The grid correspondence of mos pipe is connected to the common contact of series resistance in bleeder circuit, and the source electrode correspondence of mos pipe is connected to bleeder circuit top; The drain electrode of the mos pipe in the first threshold circuit and the second threshold circuit is interconnected.The utility model, by arranging two docking pmos pipes, both ensure that Electricity Functional was protected in input power reversal connection protection function and power-off, and had had again under-voltage disconnection defencive function, greatly reduce again power supply power operationally simultaneously.
Description
Technical field
The utility model relates to a kind of isolation DC/DC power supply input undervoltage or Electricity Functional device is protected in power-off, belongs to circuit engineering field.
Background technology
It is generally be made up of low pressure drop switching diode and multiple input bulky capacitor that circuit is protected in traditional input undervoltage and power-off.The defect of this technology is exactly: when input service electric current is large, and the power loss of switching diode is comparatively large, does not also have undervoltage turnoff function simultaneously.
Utility model content
The utility model provides a kind of isolation DC/DC power supply input undervoltage or power-off to protect Electricity Functional device, adopts two pmos pipe docking to replace switching diode, solves the problem that input power loss is large.
For solving the problems of the technologies described above, the utility model provides a kind of isolation DC/DC power supply input undervoltage or power-off to protect Electricity Functional device, it is characterized in that, comprise the first threshold circuit be connected with the input voltage of DC-DC power source and the second threshold circuit be connected with input power;
Bleeder circuit that series resistance forms is included and a mos manages in first threshold circuit and the second threshold circuit; Bleeder circuit top is connected respectively input voltage and the input power of DC-DC power source, bleeder circuit end ground connection; The grid correspondence of mos pipe is connected to the common contact of series resistance in bleeder circuit, and the source electrode correspondence of mos pipe is connected to bleeder circuit top; The drain electrode of the mos pipe in the first threshold circuit and the second threshold circuit is interconnected.
Also comprise an accumulator, accumulator one end is connected to input power, other end ground connection.
Accumulator comprises two electric capacity in parallel.
Bleeder circuit is at least made up of two resistant series.
First threshold circuit is identical with the partial pressure value of the bleeder circuit in the second threshold circuit.
First threshold circuit is identical with the mos pipe in the second threshold circuit.
Described mos pipe is pmos pipe.
The beneficial effect that the utility model reaches:
The utility model carrys out alternative traditional low pressure drop diode by arranging two docking pmos pipes; both ensure that Electricity Functional was protected in input power Vin reversal connection protection function and power-off; there is again under-voltage disconnection defencive function; greatly reduce again power supply power operationally simultaneously, the overall conversion efficiency improving DC/DC power supply is of great importance.
Accompanying drawing explanation
Fig. 1 is that Electricity Functional device is protected in isolation DC/DC power supply input undervoltage or power-off;
Fig. 2 is an embodiment of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.
As shown in Figure 1, the utility model is that Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off, mainly comprises threshold circuit 1, threshold circuit 2, accumulator.
Fig. 2 is that two pmos pipe docking form isolation DC/DC power supply input undervoltage or Electricity Functional device is protected in power-off, and in figure, Vin is the input voltage of DC-DC power source, and Vi is the under-voltage inside input power with protecting after electricity.
Threshold circuit 1 is made up of mos pipe V1 and resistance R1, R2.One end of resistance R1 and the source electrode of mos pipe V1 are connected to input voltage vin altogether, and the other end of resistance R1 and the grid of mos pipe V1 are through resistance R2 ground connection.The drain electrode of mos pipe V1 is connected to threshold circuit 2.
Threshold circuit 2 is made up of mos pipe V2 and resistance R3, R4.One end of resistance R3 and the source electrode of mos pipe V2 are connected to input power Vi altogether, and the other end of resistance R3 and the grid of mos pipe V2 are through resistance R4 ground connection.The drain electrode of mos pipe V2 is connected to threshold circuit 1.
Accumulator is made up of electric capacity C1 and C2.After electric capacity C1 and C2 parallel connection, one end is connected to input power Vi, other end ground connection.
Pmos pipe V1, V2 model is identical.R1 with R3 resistance value is identical; The resistance value of R2 with R4 is identical.
Operation principle:
When input voltage vin diminishes, when making the voltage drop numerical value on resistance R1 be less than the grid voltage thresholding of pmos pipe V1, mos pipe V1 turns off, but owing to there being body diode, still has electric current backflow to arrive input voltage vin.Because resistance R3 is the same with resistance R1, R2 dividing potential drop numerical value with the dividing potential drop numerical value of resistance R4, so mos pipe V2 turns off simultaneously, two pmos pipe reversal connections also turn off simultaneously, prevent electric current backflow to arrive input voltage vin, play the effect of the input voltage vin disconnecting DC-DC power source.Due to bulky capacitor C1, C2 energy storage, so serve the effect that electricity is protected in power-off.
When input voltage vin increase makes the voltage drop on resistance R1 be greater than the grid voltage thresholding of pmos pipe V1, pmos pipe V1 opens; Because resistance R3 is the same with resistance R1, R2 dividing potential drop numerical value with the dividing potential drop numerical value of resistance R4, so mos pipe V2 opens simultaneously, the input voltage vin normal power supply of DC-DC power source, isolation DC/DC power supply normally works.
Owing to selecting two pmos pipe V1, V2 same model, conducting resistance is about 10 milliohms, the resistance of two series connection namely about 20 milliohms, when input current is 5A, conduction voltage drop is 20 milliohm * 5A, the namely pressure drop of 0.1V, and the low pressure drop diode in traditional structure, forward voltage drop also has more than 0.5V.In traditional structure, the power dissipation of diode is 0.5V*5A=2500 milliwatt, and the conduction loss adopting two pmos pipes of the present utility model is 0.1V*5A=500 milliwatt, is the former 1/4th.So the operating power that this circuit structure greatly reduces power supply dissipates.
The utility model originality is mainly reflected in: carry out alternative traditional low pressure drop diode by arranging two docking pmos pipes; both ensure that Electricity Functional was protected in input voltage vin reversal connection protection function and power-off; there is again under-voltage disconnection defencive function; greatly reduce again power supply power operationally simultaneously, the overall conversion efficiency improving DC/DC power supply is of great importance.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection range of the present utility model.
Claims (7)
1. isolate DC/DC power supply input undervoltage or a power-off guarantor Electricity Functional device, it is characterized in that, comprise the first threshold circuit be connected with the input voltage of DC-DC power source and the second threshold circuit be connected with input power;
Bleeder circuit that series resistance forms is included and a mos manages in first threshold circuit and the second threshold circuit; Bleeder circuit top is connected respectively input voltage and the input power of DC-DC power source, bleeder circuit end ground connection; The grid correspondence of mos pipe is connected to the common contact of series resistance in bleeder circuit, and the source electrode correspondence of mos pipe is connected to bleeder circuit top; The drain electrode of the mos pipe in the first threshold circuit and the second threshold circuit is interconnected.
2. Electricity Functional device is protected in isolation DC/DC power supply input undervoltage according to claim 1 or power-off, and it is characterized in that, also comprise an accumulator, accumulator one end is connected to input power, other end ground connection.
3. Electricity Functional device is protected in isolation DC/DC power supply input undervoltage according to claim 2 or power-off, and accumulator comprises two electric capacity in parallel.
4. Electricity Functional device is protected in isolation DC/DC power supply input undervoltage according to claim 1 or power-off, and bleeder circuit is at least made up of two resistant series.
5. Electricity Functional device is protected in the isolation DC/DC power supply input undervoltage according to claim 1 or 4 or power-off, and the first threshold circuit is identical with the partial pressure value of the bleeder circuit in the second threshold circuit.
6. Electricity Functional device is protected in isolation DC/DC power supply input undervoltage according to claim 1 or power-off, and the first threshold circuit is identical with the mos pipe in the second threshold circuit.
7. Electricity Functional device is protected in the isolation DC/DC power supply input undervoltage according to claim 1 or 6 or power-off, and described mos pipe is pmos pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520320883.4U CN204668914U (en) | 2015-05-19 | 2015-05-19 | Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520320883.4U CN204668914U (en) | 2015-05-19 | 2015-05-19 | Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204668914U true CN204668914U (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520320883.4U Expired - Fee Related CN204668914U (en) | 2015-05-19 | 2015-05-19 | Electricity Functional device is protected in a kind of isolation DC/DC power supply input undervoltage or power-off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204668914U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821543A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | Device with function of isolation DC/DC power supply input under-voltage or power-off protection |
| CN108649663A (en) * | 2018-07-04 | 2018-10-12 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
-
2015
- 2015-05-19 CN CN201520320883.4U patent/CN204668914U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821543A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | Device with function of isolation DC/DC power supply input under-voltage or power-off protection |
| CN108649663A (en) * | 2018-07-04 | 2018-10-12 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 Termination date: 20200519 |