CN203039572U - Soft start circuit - Google Patents
Soft start circuit Download PDFInfo
- Publication number
- CN203039572U CN203039572U CN 201220746547 CN201220746547U CN203039572U CN 203039572 U CN203039572 U CN 203039572U CN 201220746547 CN201220746547 CN 201220746547 CN 201220746547 U CN201220746547 U CN 201220746547U CN 203039572 U CN203039572 U CN 203039572U
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- soft
- current
- limiting resistance
- electric capacity
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Abstract
The utility model discloses a soft start circuit. The circuit comprises a soft start capacitor and a current-limiting resistor which is connected in series with the soft start capacitor. The soft start capacitor and the current-limiting resistor which are connected in series are integrally connected between a voltage input terminal and ground. The circuit also comprises a switch circuit which is connected in parallel with the current-limiting resistor. The structure of the soft start circuit of the utility model is simple and cost is low. And the circuit is suitable for an occasion where a large current is input.
Description
Technical field
The utility model arranges electronic technology field, more particularly, relates to a kind of soft starting circuit, is applicable to the occasion of the big electric current of input.
Background technology
In, in the powerful DC-DC converter because input has the existence of large bulk capacitance, when connecting the input power supply, power supply charges to jumbo electric capacity, current changing rate is very big, can cause the phenomenon of sparking.Usually addressed this problem two kinds of methods:
First method, go here and there thermistor at main road, limit charging current with this, when voltage is added to input, port voltage can charge to electric capacity by thermistor, and this moment, the size of charging current equaled port voltage divided by thermosensitive resistance, began to have electric current to flow through on thermistor, after producing heat, the thermistor resistance will reduce thereupon.
Second method, power resistor on main road is gone here and there is connected in parallel on the resistance two ends with relay, and relay is normally open.When voltage was added to input, port voltage charged to electric capacity by power resistor, and charging current equals port voltage divided by the power resistor resistance, and capacitance voltage fills high after to a certain degree, and relay closes is finished the process of soft start.
Wherein, first method is suitable for small-power power, because the resistance of thermistor has determined use occasion, if thermistor uses the occasion at big input current, can bring very big supplementary load loss, in addition, because the thermal inertia of thermistor, again recovering high resistant needs the time, so for needing the very situation of Quick connecting pipe fitting behind the power cut-off again, do not have metering function sometimes.It is not very big occasion for interchange, input current that second method is suitable for input, because the direct current relay volume of big electric current is big, price is high, can increase cost and the volume of product, in order to solve the problem of soft start, the cost of paying is higher.
No matter which kind of method all is in order to realize current-limiting charge in the process that starts, the problem of sparking in the time of so just can solving charging.
The utility model content
The utility model can't be applicable to the occasion of the big electric current of input at existing soft starting circuit, and the high defective of cost, and a kind of soft starting circuit is provided, and simple in structure, cost is low, and is applicable to the occasion of the big electric current of input.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of soft starting circuit is provided, comprise soft open electric capacity, with the described soft current-limiting resistance that opens capacitances in series, the described soft series connection integral body that opens electric capacity and described current-limiting resistance is connected between voltage input end and the ground, and described circuit also comprises the switching circuit in parallel with described current-limiting resistance.
Preferably, described soft first end that opens electric capacity connects voltage input end, and described soft second end that opens electric capacity connects first end of described current-limiting resistance, the second end ground connection of described current-limiting resistance.
Further preferably, described switching circuit comprises field effect transistor, and the drain electrode of described field effect transistor is connected in the described soft node that opens electric capacity and described current-limiting resistance, the source ground of described field effect transistor.
Further preferably, described switching circuit comprises electromagnetic relay, and first end of the switch of described electromagnetic relay is connected in the described soft node that opens electric capacity and described current-limiting resistance, the second end ground connection of the switch of described electromagnetic relay.
Preferably, described soft first end that opens electric capacity connects second end of described current-limiting resistance, the described soft second end ground connection of opening electric capacity, and first end of described current-limiting resistance connects voltage input end.
Further preferably, described switching circuit comprises field effect transistor, and the drain electrode of described field effect transistor connects voltage input end, and the source electrode of described field effect transistor is connected in the described soft node that opens electric capacity and described current-limiting resistance.
Further preferably, described switching circuit comprises electromagnetic relay, and first end of the switch of described electromagnetic relay connects voltage input end, and second end of the switch of described electromagnetic relay is connected in the described soft node that opens electric capacity and described current-limiting resistance.
Soft starting circuit of the present utility model is simple in structure, and cost is low, and is applicable to the occasion of the big electric current of input.
Description of drawings
Fig. 1 is the basic circuit diagram of soft starting circuit of the present utility model;
Fig. 2 is the circuit diagram of soft starting circuit first embodiment of the present utility model;
Fig. 3 is the circuit diagram of soft starting circuit second embodiment of the present utility model;
Fig. 4 is the circuit diagram of soft starting circuit the 3rd embodiment of the present utility model;
Fig. 5 is the circuit diagram of soft starting circuit the 4th embodiment of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further explained explanation.
Fig. 1 is the basic circuit diagram of soft starting circuit 100 of the present utility model, and as shown in Figure 1, in the utility model, soft starting circuit 100 comprises that soft starting circuit 100 of the present utility model comprises soft capacitor C, current-limiting resistance R and the switching circuit 110 of opening.Wherein, soft capacitor C and the current-limiting resistance R of opening is connected between voltage input end VCC and the ground GND, and switching circuit 110 is in parallel with current-limiting resistance R.The voltage output end Vout of soft starting circuit 100 connects load.
Current-limiting resistance R is used for limiting the electric current that opens the capacitor C charging to soft, and switching circuit 110 opens the capacitor C charging back conducting that finishes soft.
Fig. 2 is the circuit diagram of soft starting circuit 100 first embodiment of the present utility model, and as shown in Figure 1, in the present embodiment, soft starting circuit 100 of the present utility model comprises soft capacitor C, current-limiting resistance R and the switching circuit 110 of opening.In the present embodiment, the load of the voltage output end Vout of soft starting circuit 100 connection is example with the BOOST booster circuit.
In the present embodiment, soft first end that opens capacitor C connects voltage input end VCC, and soft second end that opens capacitor C connects first end of current-limiting resistance R, the second end ground connection GND of current-limiting resistance R.
Current-limiting resistance R is used for limiting the electric current that opens the capacitor C charging to soft, field effect transistor Q opens the capacitor C charging back conducting that finishes soft, the electric current that flows through on the field effect transistor Q gets final product so the size of current of field effect transistor Q only need satisfy ripple current for the ripple current of back level topology.
Fig. 3 is the circuit diagram of soft starting circuit 100 second embodiment of the present utility model, and as shown in Figure 3, in the present embodiment, switching circuit 110 comprises electromagnetic relay J.
First end of the switch of electromagnetic relay J is connected in the soft node that opens capacitor C and current-limiting resistance R, the second end ground connection GND of the switch of electromagnetic relay J.The ends A 1 of the coil of electromagnetic relay J is connected outside control circuit with A2, be implemented in the soft capacitor C that opens and be full of the received current input of electricity back, makes the switch closure (operation principle of electromagnetic relay is prior art) of electromagnetic relay J.For example, control circuit comprises CPU, and the coil of electromagnetic relay J is implemented in the soft capacitor C that opens and is full of the received current input of electricity back under the control of CPU, makes the switch closure of electromagnetic relay J.
In the present embodiment, all the other situations are identical with soft starting circuit 100 first embodiment of the present utility model, do not repeat them here.
Fig. 4 is the circuit diagram of soft starting circuit 100 the 3rd embodiment of the present utility model, as shown in Figure 4, in the present embodiment, soft first end that opens capacitor C connects second end of current-limiting resistance R, the soft second end ground connection GND that opens capacitor C, first end of current-limiting resistance R connects voltage input end VCC.
In the present embodiment, the load of the voltage output end Vout of soft starting circuit 100 connection is example with the BOOST booster circuit.
In the present embodiment, switching circuit 110 comprises field effect transistor Q, and the drain electrode of field effect transistor Q connects voltage input end VCC, and the source electrode of field effect transistor Q is connected in the soft node that opens capacitor C and current-limiting resistance R.
Fig. 5 is the circuit diagram of soft starting circuit 100 the 4th embodiment of the present utility model, as shown in Figure 5, in the present embodiment, switching circuit 110 comprises electromagnetic relay J, first end of the switch of electromagnetic relay J connects voltage input end VCC, and second end of the switch of electromagnetic relay J is connected in the soft node that opens capacitor C and described current-limiting resistance R.
In the present embodiment, all the other situations are identical with soft starting circuit 100 the 3rd embodiment of the present utility model, do not repeat them here.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present utility model.In addition, the technical characterictic among each embodiment of the utility model may be used alone, can also be used in combination.
Claims (7)
1. soft starting circuit, it is characterized in that, comprise soft open electric capacity (C), with the described soft current-limiting resistance (R) that electric capacity (C) is connected that opens, the described soft series connection integral body that opens electric capacity (C) and described current-limiting resistance (R) is connected between voltage input end (VCC) and the ground (GND), and described circuit also comprises the switching circuit (110) in parallel with described current-limiting resistance (R).
2. soft starting circuit according to claim 1, it is characterized in that, described soft first end that opens electric capacity (C) connects voltage input end (VCC), described soft second end that opens electric capacity (C) connects first end of described current-limiting resistance (R), the second end ground connection (GND) of described current-limiting resistance (R).
3. soft starting circuit according to claim 2, it is characterized in that, described switching circuit (110) comprises field effect transistor (Q), the drain electrode of described field effect transistor (Q) is connected in the described soft node that opens electric capacity (C) and described current-limiting resistance (R), the source ground (GND) of described field effect transistor (Q).
4. soft starting circuit according to claim 2, it is characterized in that, described switching circuit (110) comprises electromagnetic relay (J), first end of the switch of described electromagnetic relay (J) is connected in the described soft node that opens electric capacity (C) and described current-limiting resistance (R), the second end ground connection (GND) of the switch of described electromagnetic relay (J).
5. soft starting circuit according to claim 1, it is characterized in that, described soft first end that opens electric capacity (C) connects second end of described current-limiting resistance (R), the described soft second end ground connection (GND) of opening electric capacity (C), first end of described current-limiting resistance (R) connects voltage input end (VCC).
6. soft starting circuit according to claim 5, it is characterized in that, described switching circuit (110) comprises field effect transistor (Q), the drain electrode of described field effect transistor (Q) connects voltage input end (VCC), and the source electrode of described field effect transistor (Q) is connected in the described soft node that opens electric capacity (C) and described current-limiting resistance (R).
7. soft starting circuit according to claim 5, it is characterized in that, described switching circuit (110) comprises electromagnetic relay (J), first end of the switch of described electromagnetic relay (J) connects voltage input end (VCC), and second end of the switch of described electromagnetic relay (J) is connected in the described soft node that opens electric capacity (C) and described current-limiting resistance (R).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746547 CN203039572U (en) | 2012-12-31 | 2012-12-31 | Soft start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220746547 CN203039572U (en) | 2012-12-31 | 2012-12-31 | Soft start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039572U true CN203039572U (en) | 2013-07-03 |
Family
ID=48691657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220746547 Expired - Lifetime CN203039572U (en) | 2012-12-31 | 2012-12-31 | Soft start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203039572U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426345A (en) * | 2013-08-22 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | External soft start circuit of Buck converter |
| CN105450050A (en) * | 2015-12-22 | 2016-03-30 | 上海交通大学 | Soft electrification and rectification circuit of electrolytic capacitor string electrification resistor |
| CN107420243A (en) * | 2017-08-25 | 2017-12-01 | 彭冬亮 | A kind of economizer circuit for controlling output voltage |
| CN108512409A (en) * | 2018-05-31 | 2018-09-07 | 西南交通大学 | A kind of highpowerpulse load power source soft starting device and start method |
| CN109861518A (en) * | 2019-03-27 | 2019-06-07 | 深圳市航嘉驰源电气股份有限公司 | A kind of current-limited startup circuit and power-switching circuit |
-
2012
- 2012-12-31 CN CN 201220746547 patent/CN203039572U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426345A (en) * | 2013-08-22 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | External soft start circuit of Buck converter |
| CN105450050A (en) * | 2015-12-22 | 2016-03-30 | 上海交通大学 | Soft electrification and rectification circuit of electrolytic capacitor string electrification resistor |
| CN105450050B (en) * | 2015-12-22 | 2018-08-03 | 上海交通大学 | Electrolytic capacitor string powers on the soft of resistance and powers on rectification circuit |
| CN107420243A (en) * | 2017-08-25 | 2017-12-01 | 彭冬亮 | A kind of economizer circuit for controlling output voltage |
| CN108512409A (en) * | 2018-05-31 | 2018-09-07 | 西南交通大学 | A kind of highpowerpulse load power source soft starting device and start method |
| CN109861518A (en) * | 2019-03-27 | 2019-06-07 | 深圳市航嘉驰源电气股份有限公司 | A kind of current-limited startup circuit and power-switching circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SINEXCEL ELECTRIC CO., LTD. Free format text: FORMER NAME: SHENZHEN CITY SHENGHONG ELECTRIC CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Nanshan District Xili street of Shenzhen city in Guangdong province 518054 White Pine Road No. 1002, Piovan letter High-tech Industrial Park District 2 Building 6 Patentee after: SHENZHEN SINEXCEL ELECTRICAL Co.,Ltd. Address before: 518054 Guangdong city of Shenzhen province Nanshan District Xili Zhongshan Road No. 1001 E international city building D1 building 6 floor Patentee before: Shenzhen Sinexcel Electric Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
|
| CX01 | Expiry of patent term |