CN104242622A - Soft start circuit and DC conversion power supply - Google Patents
Soft start circuit and DC conversion power supply Download PDFInfo
- Publication number
- CN104242622A CN104242622A CN201310224680.0A CN201310224680A CN104242622A CN 104242622 A CN104242622 A CN 104242622A CN 201310224680 A CN201310224680 A CN 201310224680A CN 104242622 A CN104242622 A CN 104242622A
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- circuit
- soft starting
- starting circuit
- power supply
- voltage
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- Emergency Protection Circuit Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a soft start circuit and DC conversion power supply comprising a resistor, a unidirectional transient voltage inhibitor and a switch; the resistor and the unidirectional transient voltage inhibitor are connected in series to form a branch; the switch is connected in parallel with the branch, and one end after the parallel connection is connected with one end of a power supplied target, and the other end after the parallel connection serves as one wiring end; the other end of the power supplied target serves as the other wiring end of the power supply. The scheme can improve reliability of the circuit.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of soft starting circuit and DC transformating power.
Background technology
Soft starting circuit all can be adopted in electronic equipments a lot of to be at present powered object with protection.Such as in DC transformating power, conventional soft starting circuit as shown in Figure 1, comprise divider resistance R, diode D, normal open switch K1, normally closed switch K2 and power circuit, power circuit is specially DC/DC circuit, and wherein, resistance R, diode D and normally closed switch K2 series connection is a branch road, this branch circuit parallel connection of normal open switch K1, one end after parallel connection connects one end of power circuit, and the other end is as terminals of power supply, and the other end of power circuit is as another terminals of this power supply.In soft start-up process, normal open switch K1 is in off-state, and the diode D in circuit can be anti-by positive and negative for input power termination in user misoperation, i.e., during the reverse voltage of circuit input service voltage, make circuit be in open-circuit condition, protection power circuit.
But circumstance complication in actual applications, the situations such as very possible experience thunderbolt, make circuit input surge voltage, namely exceed the instant high-voltage of normal working voltage.If in soft start-up process, have input a surge voltage from the negative terminals of power supply, namely during circuit input reverse surge voltage, the reverse voltage that diode D bears at two ends is comparatively large, and may cause the breakdown damage of diode D, the reliability of circuit is lower.
Summary of the invention
The embodiment of the present invention provides a kind of soft starting circuit and DC transformating power, in order to improve circuit reliability.
The embodiment of the present invention provides a kind of soft starting circuit, comprises resistance, unidirectional Transient Voltage Suppressor and switch, wherein:
Described resistance and described unidirectional Transient Voltage Suppressor series connection are a branch road;
Described switch and described branch circuit parallel connection, the one end after parallel connection connects the one end being powered object, and the other end is as terminals of power supply;
The described other end another terminals as described power supply being powered object.
The embodiment of the present invention also provides a kind of DC transformating power, comprises above-mentioned soft starting circuit.
The scheme that the embodiment of the present invention provides, when this soft starting circuit input reverse surge voltage, unidirectional Transient Voltage Suppressor reverse-conducting, can release to surge voltage, improves the reliability of circuit.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, is not construed as limiting the invention with the embodiment of the present invention one.In the accompanying drawings:
Fig. 1 is soft starting circuit schematic diagram in prior art;
The soft starting circuit schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The soft starting circuit schematic diagram that Fig. 3 provides for the embodiment of the present invention 1.
Embodiment
In order to provide the implementation of the higher soft starting circuit of reliability, embodiments provide a kind of soft starting circuit and DC transformating power, below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein, only for instruction and explanation of the present invention, is not intended to limit the present invention.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiments provide a kind of soft starting circuit, as shown in Figure 2, comprise resistance R, unidirectional Transient Voltage Suppressor DZ and K switch 1, wherein:
Resistance R and unidirectional Transient Voltage Suppressor DZ series connection is a branch road; K switch 1 and this branch circuit parallel connection, the one end after parallel connection connects the one end being powered object, and the other end is as terminals of power supply; Be powered the other end another terminals as this power supply of object.
Further, the puncture voltage of unidirectional Transient Voltage Suppressor DZ is greater than the operating voltage of this soft starting circuit, is less than predeterminated voltage.Predeterminated voltage can set according to concrete condition during practical application.
The object that is powered in above-mentioned soft starting circuit can be a power electronic device, also can be a circuit etc.
Further, go back soft starting circuit and can also comprise another K switch 2, the series connection of resistance R, unidirectional Transient Voltage Suppressor DZ and this K switch 2 is a branch road; K switch 1 and this branch circuit parallel connection; when input voltage is too high, this K switch 2 can be disconnected, be powered object to protect.
Below in conjunction with accompanying drawing, with specific embodiment, above-mentioned soft starting circuit is described in detail.
Embodiment 1:
The embodiment of the present invention 1 provides a kind of soft starting circuit, as shown in Figure 3, comprises resistance R, normal open switch K1, normally closed switch K2 and unidirectional Transient Voltage Suppressor DZ, wherein:
Link after one end of resistance R is connected with one end of normal open switch K1 is as the positive terminals DC+ of power supply; The other end of resistance R connects the anode of unidirectional Transient Voltage Suppressor DZ; The negative electrode of unidirectional Transient Voltage Suppressor DZ connects one end of normally closed switch K2, and the other end of normally closed switch K2 connects the other end of normal open switch K1, and connects the one end being powered object; Be powered the other end of object as power-terminals DC-.
Wherein, the puncture voltage of unidirectional Transient Voltage Suppressor DZ should be greater than the operating voltage of this soft starting circuit, be less than predeterminated voltage, to make unidirectional Transient Voltage Suppressor DZ not conducting when bearing the reverse voltage of operating voltage, and when bearing reverse surge voltage reverse-conducting.Predeterminated voltage can set according to concrete condition during practical application.
Preferably, the unidirectional Transient Voltage Suppressor of puncture voltage slightly larger than the operating voltage of this soft starting circuit can be chosen.
In order to further illustrate the soft starting circuit that the embodiment of the present invention 1 provides, below its operation principle is set forth:
In soft start-up process, when this soft starting circuit input service voltage or forward surge voltage, the equal forward conduction of unidirectional Transient Voltage Suppressor DZ, make circuit be in channel status, forward surge voltage can be released;
When the reverse voltage of this soft starting circuit input service voltage, unidirectional Transient Voltage Suppressor DZ turns off, and circuit is in open-circuit condition;
When this soft starting circuit input reverse surge voltage time, unidirectional Transient Voltage Suppressor DZ can within the extremely short time reverse-conducting, surge voltage is released, and unidirectional Transient Voltage Suppressor DZ can clamp voltage.
Visible, adopt the soft starting circuit that the embodiment of the present invention 1 provides, the reliability of circuit is higher, and this soft starting circuit device is less, does not increase circuit volume.
Embodiment 2:
The embodiment of the present invention 2 provides a kind of DC transformating power, comprises the soft starting circuit of above-mentioned Fig. 2 or Fig. 3.
Power circuit in DC transformating power is and is powered object in above-mentioned soft starting circuit.
In sum, the soft starting circuit that the embodiment of the present invention provides, comprises resistance, unidirectional Transient Voltage Suppressor and switch, wherein: this resistance and this unidirectional Transient Voltage Suppressor series connection are a branch road; This switch and this branch circuit parallel connection, the one end after parallel connection connects the one end being powered object, and the other end is as terminals of power supply; This is powered the other end another terminals as this power supply of object.The soft starting circuit adopting the embodiment of the present invention to provide, can improve circuit reliability.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. a soft starting circuit, is characterized in that, comprises resistance, unidirectional Transient Voltage Suppressor and switch, wherein:
Described resistance and described unidirectional Transient Voltage Suppressor series connection are a branch road;
Described switch and described branch circuit parallel connection, the one end after parallel connection connects the one end being powered object, and the other end is as terminals of power supply;
The described other end another terminals as described power supply being powered object.
2. soft starting circuit as claimed in claim 1, it is characterized in that, the puncture voltage of described unidirectional Transient Voltage Suppressor is greater than the operating voltage of described soft starting circuit, is less than predeterminated voltage.
3. a DC transformating power, is characterized in that, comprises soft starting circuit as claimed in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310224680.0A CN104242622A (en) | 2013-06-06 | 2013-06-06 | Soft start circuit and DC conversion power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310224680.0A CN104242622A (en) | 2013-06-06 | 2013-06-06 | Soft start circuit and DC conversion power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104242622A true CN104242622A (en) | 2014-12-24 |
Family
ID=52230162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310224680.0A Pending CN104242622A (en) | 2013-06-06 | 2013-06-06 | Soft start circuit and DC conversion power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104242622A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201398073Y (en) * | 2009-05-22 | 2010-02-03 | 上海华魏光纤传感技术有限公司 | Novel power supply safety protection system |
| CN102427225A (en) * | 2011-12-28 | 2012-04-25 | 上海施能电器设备厂 | TVS (transient voltage suppressor) current peak protective circuit |
| CN102496923A (en) * | 2011-11-14 | 2012-06-13 | 株洲南车时代电气股份有限公司 | Input circuit with reverse connection preventing protection |
| CN102593810A (en) * | 2012-01-20 | 2012-07-18 | 华为技术有限公司 | Surge protection circuit |
| CN202797964U (en) * | 2012-09-26 | 2013-03-13 | 荆州市鑫祥科技开发有限责任公司 | Starting protection circuit capable of preventing reverse connection damage |
-
2013
- 2013-06-06 CN CN201310224680.0A patent/CN104242622A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201398073Y (en) * | 2009-05-22 | 2010-02-03 | 上海华魏光纤传感技术有限公司 | Novel power supply safety protection system |
| CN102496923A (en) * | 2011-11-14 | 2012-06-13 | 株洲南车时代电气股份有限公司 | Input circuit with reverse connection preventing protection |
| CN102427225A (en) * | 2011-12-28 | 2012-04-25 | 上海施能电器设备厂 | TVS (transient voltage suppressor) current peak protective circuit |
| CN102593810A (en) * | 2012-01-20 | 2012-07-18 | 华为技术有限公司 | Surge protection circuit |
| CN202797964U (en) * | 2012-09-26 | 2013-03-13 | 荆州市鑫祥科技开发有限责任公司 | Starting protection circuit capable of preventing reverse connection damage |
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Legal Events
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| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141224 |
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| RJ01 | Rejection of invention patent application after publication |