CN2641880Y - Power source circuit - Google Patents
Power source circuit Download PDFInfo
- Publication number
- CN2641880Y CN2641880Y CN 03266620 CN03266620U CN2641880Y CN 2641880 Y CN2641880 Y CN 2641880Y CN 03266620 CN03266620 CN 03266620 CN 03266620 U CN03266620 U CN 03266620U CN 2641880 Y CN2641880 Y CN 2641880Y
- Authority
- CN
- China
- Prior art keywords
- unit
- power supply
- circuit
- protected location
- road
- 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.)
- Expired - Lifetime
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Abstract
The utility model provides a power circuit, which comprises at least a combining unit and a protecting unit. The utility model is characterized in that each input power source is in tandem connection with each protecting unit of the same circuit; the output end of each protecting unit is in tandem connection with each input end of the combining unit; the combining unit has an output circuit to provide power for the device. The protecting unit comprises current protecting units in tandem connection with the input power source of each circuit, or voltage protecting units in parallel connection with the input power source of each circuit. The utility model realizes the protection of the combining unit by the protecting unit, improving the reliability of the power circuit.
Description
Technical field
The utility model relates to the circuit protection device field, is meant a kind of power circuit especially.
Background technology
In the electronization epoch, busy day by day numerous and jumbled affairs are able in good order by high-speed electronic calculator, automation equipment and communication apparatus.Along with development of technology, the operating voltage of these sensitive electronic equipments is in continuous reduction, quantity and scale are in continuous expansion, therefore they be subjected to overvoltage particularly thunder and lightning attack and injured possibility just increases greatly, its consequence may make the outage of whole system, causes the economic loss that is difficult to estimate.
For fear of the accidental interruption and the high impact of flowing high pressure to equipment of moment of device power supply (DPS), the input at power supply adds backup battery and protective circuit usually.Fig. 1 is present power circuit.Backup protection circuit as shown in Figure 1, two-way input power supply is arranged, adopt combiner unit that this two-way input unit is formed mutually redundant power supply, simple two-way combiner unit can be made of two diodes, each diode connects its input power supply separately, makes the two-way circuit of input not form current circuit; The two-way power supply is through combiner unit, be combined into one road power supply after, carry out current limiting pressure-limiting through protected location, protected location often is made of voltage protection unit and current protection unit, the current protection unit as common fuse, is used for preventing that the electric current of power supply output is excessive; Voltage protection unit suppresses diode (TVS) as transient voltage, is used for preventing that the voltage of exporting is excessive.Power supply is through the backup protection circuit, for equipment provides qualified power supply.
But, for sort circuit, when producing instantaneous pressure to the input voltage forward impact because of reasons such as thunder and lightning, inductive loads in parallel, surge voltage and electric current flow directly into combiner unit, make the breakdown damage of combiner unit, when combiner unit lost efficacy or damaged, may cause input two-way power supply short circuit, become a defective of power circuit.
Summary of the invention
In view of this, the utility model provides a kind of power circuit, has both guaranteed that power circuit exports reliable power supply, provides protection for the combiner unit in the power circuit again.
Power circuit described in the utility model; at least comprise the combiner unit and the protected location that a plurality of input power supplys are combined into one tunnel output; wherein; each road input power supply is contacted with each road protected location respectively; the output of each road protected location is contacted with each road input of combiner unit respectively, and combiner unit is exported one road power supply.
Wherein, protected location described in the utility model further comprises current protection unit and voltage protection unit.The current protection unit is fuse, self-healing fuse (JKPPTC) or thermistor etc., and this current protection cell string is in described input power supply; Voltage protection unit is that transient voltage suppresses diode (TVS), piezo-resistance or gas discharge tube etc., and this voltage protection unit is parallel to described input power supply.
By the utility model as can be seen, this circuit not only provides the power protecting circuit of current limiting pressure-limiting to connected equipment, also combiner unit is protected.When input voltage impacted because of thunder and lightning, inductive load in parallel etc., the impact of high pressure did not flow directly into combiner unit, and combiner unit at first is protected the protection of unit overcurrent, overvoltage, has improved the reliability of fallback circuit.Because the power supply of input combiner unit has carried out current limiting pressure-limiting, therefore,, can select wider radio frequency front ends to withstand voltage, the anti-stream requirement reduction greatly of combiner unit.
Description of drawings
Fig. 1 is the prior art power circuit diagram.
Fig. 2 is the utility model power circuit diagram.
Embodiment
The utility model carries out the current limiting pressure-limiting protection through protected location at first respectively to every road input of power supply, is providing one tunnel input through combiner unit then.Make protected location can not only carry out the protection of pressure-limit current-limit, and combiner unit is also protected the equipment that uses this power supply.Fig. 2 is the utility model power circuit diagram.Below, the utility model is further described by specific embodiment and with reference to accompanying drawing 2.
Backup protection circuit shown in Figure 2 is contacted in proper order by protected location, combiner unit and is constituted.
Wherein, each road input power supply protected location of contacting at first respectively, each road protected location carries out the current limiting pressure-limiting protection to each road input power supply.The current protection unit of protected location carries out current-limiting protection as fuse or current-limiting circuit, and when electric current was higher than the fuse threshold values, current-limiting protection was carried out in blown fuse; The voltage protection unit of protected location; carry out voltage-limiting protection as TVS; when impacting with high pressure appears in input; when being added in voltage on the TVS and being higher than the puncture voltage of unit; the diode reverse passage conducting of TVS discharges overrating voltage by the common port that links to each other with TVS, carry out voltage-limiting protection; when the reversal connection of input power supply mistake, the backward channel that TVS provides shields.Current protection unit and voltage protection unit can also can be combined in a kind of device and realize respectively by corresponding devices realization separately.
Each road protected location exports each road input of combiner unit to, and synthetic one road power supply output of combiner unit is for the equipment that is connect provides power supply.
Wherein, described protected location is realized current limliting and voltage-limiting protection, and internal circuit all can change, as elder generation's process voltage protection unit, again through the overcurrent protection unit.The current protection unit further adopts self-healing fuse (JKPPTC), various thermistor; Voltage protection unit can also adopt piezo-resistance, gas discharge tube etc., is not limited to that embodiment mentions.Even at some to static, the insensitive place of thunder and lightning, not working voltage protected location.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1, a kind of power circuit; at least comprise the combiner unit and the protected location that a plurality of input power supplys are combined into one tunnel output; it is characterized in that: each road input power supply is contacted with each road protected location respectively; the output of each road protected location is contacted with each road input of combiner unit respectively, and combiner unit is exported one road power supply.
2, power circuit according to claim 1 is characterized in that, described protected location further comprises the current protection unit, and this current protection cell string is in described input power supply.
3, power circuit according to claim 1 and 2 is characterized in that, described protected location further comprises voltage protection unit, and this voltage protection unit is parallel to described input power supply.
4, power circuit according to claim 2 is characterized in that, described current protection unit is fuse, self-healing fuse (JKPPTC) or thermistor.
5, power circuit according to claim 3 is characterized in that, described voltage protection unit is that transient voltage suppresses diode (TVS), piezo-resistance or gas discharge tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03266620 CN2641880Y (en) | 2003-07-01 | 2003-07-01 | Power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03266620 CN2641880Y (en) | 2003-07-01 | 2003-07-01 | Power source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2641880Y true CN2641880Y (en) | 2004-09-15 |
Family
ID=34298363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03266620 Expired - Lifetime CN2641880Y (en) | 2003-07-01 | 2003-07-01 | Power source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2641880Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545191A (en) * | 2010-11-23 | 2012-07-04 | 飞兆半导体公司 | Input power port protection component |
| CN107221922A (en) * | 2017-07-13 | 2017-09-29 | 江苏创通电子股份有限公司 | A kind of overvoltage self-protection circuit |
| CN104078922B (en) * | 2013-03-29 | 2017-12-12 | 泰科电子(上海)有限公司 | Short-circuit protection |
-
2003
- 2003-07-01 CN CN 03266620 patent/CN2641880Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545191A (en) * | 2010-11-23 | 2012-07-04 | 飞兆半导体公司 | Input power port protection component |
| CN104078922B (en) * | 2013-03-29 | 2017-12-12 | 泰科电子(上海)有限公司 | Short-circuit protection |
| CN107221922A (en) * | 2017-07-13 | 2017-09-29 | 江苏创通电子股份有限公司 | A kind of overvoltage self-protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130701 Granted publication date: 20040915 |