CN201708697U - Direct-current power source switching device - Google Patents
Direct-current power source switching device Download PDFInfo
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- CN201708697U CN201708697U CN2010202134192U CN201020213419U CN201708697U CN 201708697 U CN201708697 U CN 201708697U CN 2010202134192 U CN2010202134192 U CN 2010202134192U CN 201020213419 U CN201020213419 U CN 201020213419U CN 201708697 U CN201708697 U CN 201708697U
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Abstract
The utility model provides a direct-current power source switching device, which has simple circuits and can completely prevent striking current. The switching device comprises a slow start-up circuit and a voltage boosting circuit, an input end of the slow start-up circuit is connected with a direct-current power source while an output thereof is connected to an input end of the voltage boosting circuit, an output end of the voltage boosting circuit is connected with a load, the slow start-up circuit consists of a first electronic switch, a second electronic switch, a second switch control circuit, a protecting resistor and a feedback control circuit, the first electronic switch is a field-effect tube, a source electrode of the field-effect tube is connected with an anode of the direct-current power source, a drain electrode of the field-effect tube is connected with the voltage boosting circuit, the second switch control circuit is connected to a control end of the second electronic switch to control switching of the second electronic switch, a first end of the second electronic switch is connected to a grid electrode of the field-effect tube, a second end of the second electronic switch is connected to a cathode of the direct-current power source, the protecting resistor is connected between the source electrode and the grid electrode of the field-effect tube, and the feedback control circuit is connected between the grid electrode and the drain electrode of the field-effect tube.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to the power switch device that contains soft-start circuit and booster circuit.
Background technology
Switching Power Supply application now is more and more widely than linear power supply.And the input circuit of Switching Power Supply mostly adopts rectification to add the capacitor filtering circuit.Close a floodgate moment at input circuit,, can form very big temporary impact electric current, be generally running current more than 10 times because the initial voltage on the capacitor is zero.High power switching power supply particularly, the filtering capacitor of larger capacity is adopted in its input, and its impulse current can reach more than the 100A.In power connection moment, so big impulse current amplitude tends to cause importing fuse blows, sometimes even with the burning of contact of combined floodgate switch.The lighter also can make air switch close not brake application.Above-mentioned reason all can cause Switching Power Supply normally to use.For this reason, nearly all Switching Power Supply all is provided with the soft-start circuit that prevents impulse current in its input circuit, normally and reliably moves to guarantee Switching Power Supply.
Wherein, during the DC power supply powering load, the common booster circuit that is equipped with, boosting makes it satisfy the power supply scope of user side or electronic load; Yet user side or electronic load have capacitive and two kinds of speciality of perception, and capacitive load can start moment in DC power supply and presents short-circuit condition; Promptly can produce great impulse current, cause supply power voltage moment to fall phenomenon with the output voltage deficiency, make the circuit can't operate as normal, even may damage the circuit elements device in the moment that DC power supply starts.
Common soft-start circuit has thermistor impulse-current-proof circuit, and it utilizes the negative temperature coefficient feature of the Rt of thermistor, and in power connection moment, the resistance of thermistor is bigger, reaches the effect of restriction impulse current; When thermistor flows through big electric current, resistance heating and its resistance is diminished, circuit is in normal operating conditions.Adopt thermistor to prevent that impulse current generally is applicable to small-power switching power-supply, because the thermal inertia of thermistor, recovering high resistant again 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.
Also comprise the SCR-R circuit and improve circuit etc., it mainly is to utilize when the power supply momentary connection, input voltage charges to capacitor C through rectifier bridge VD1～VD4 and current-limiting resistance R, when capacitor C is charged to about 80% rated voltage, the inverter operate as normal, triggering signal through the auxiliary winding generation of main transformer thyristor makes thyristor conducting and short circuit current limitation resistance R, and Switching Power Supply is in normal operating condition.
There are the following problems for this current-limiting circuit: behind the power supply momentary power failure, because the voltage on the capacitor C can not suddenly change, still have the preceding charging voltage of outage on it, inverter may be also in running order, keep thyristor to continue conducting, can equally do not have the effect that prevent impulse current if reclose the input power supply this moment at once.And circuit relative complex.
The utility model content
The utility model provides a kind of circuit to prevent the DC power supply switch device of impulse current simply, fully for solving the problems of the technologies described above.
A kind of DC power supply switch device comprises soft-start circuit and booster circuit, and described soft-start circuit input connects DC power supply, and output is connected to the booster circuit input, and the booster circuit output connects load;
Soft-start circuit comprises first electronic switch, second electronic switch, second switch control circuit, protective resistance and feedback control circuit;
Described first electronic switch is a field effect transistor; The source electrode of described field effect transistor connects dc power anode, and drain electrode is connected with booster circuit;
The second switch control circuit is connected to second electronic switch controling end, controls the break-make of described second electronic switch; First end of second electronic switch is connected to the grid of field effect transistor, and second end is connected to dc power cathode;
Protective resistance is connected between described field effect transistor source electrode and the grid; Described feedback control circuit is connected between described fet gate and the drain electrode.
Adopt the utility model circuit, when powering to booster circuit by switching tube in DC power supply moment, the input voltage of control booster circuit slowly rises; High immediate current is controlled at a lower level, avoided booster circuit can produce great impulse current and caused supply power voltage moment to fall situation with the output voltage deficiency in the moment that DC power supply is connected.This circuit is built simply, and cost is low, only need utilize common electronic switch and RC feedback circuit can realize good slow startup.
Description of drawings
Fig. 1 is a DC power supply switch device block diagram in the utility model embodiment;
Fig. 2 is a DC power supply switch device sequential chart in the utility model embodiment;
Fig. 3 is DC power supply switch device circuit figure in the utility model embodiment;
Fig. 4 is a current and power supply switching device in the utility model embodiment.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As Fig. 1, Fig. 3, shown in Figure 4, desire is described a kind of DC power supply switch device in detail in this embodiment, comprises soft-start circuit 2 and booster circuit 3;
Described soft-start circuit input U
iConnect DC power supply 1, output U
oBe connected to the booster circuit input, the booster circuit output connects load 4;
Soft-start circuit 2 comprises the first electronic switch Q1, the second electronic switch Q2, second switch control circuit 22, protective resistance R1 and feedback control circuit 21;
The described first electronic switch Q1 is a field effect transistor; The source S of described field effect transistor connects DC power supply 1 positive pole, and drain D is connected with booster circuit.
As shown in Figure 3, Figure 4, second switch control circuit 22 is connected to the second electronic switch Q2 control end 3, controls the break-make of the described second electronic switch Q2; First end 1 of the second electronic switch Q2 is connected to the grid G of field effect transistor, and second end 2 is connected to DC power supply 1 negative pole;
Protective resistance R1 is connected between described field effect transistor source S and the grid G; Described feedback control circuit 21 is connected between described fet gate G and the drain D.
Second switch control circuit 22 is the logical circuit control circuit that MCU or trigger are formed.
Field effect transistor is the P-channel field-effect transistor (PEFT) pipe in this example.
Described second electronic switch is just controlled logical section of first electronic switch, can adopt common electronic switch in the electronic applications, such as transistor, field effect transistor or the like.
About the parameter of each electronic original part, those skilled in the art can be provided with voluntarily according to our description, need not to pay creative work, are 10K ohm such as protective resistance R1 in this example, and capacitor C 1 is 0.1uF, and R2 is 1K ohm.
As shown in Figure 3, about booster circuit, can adopt circuit well-known to those skilled in the art, enumerate as an illustration a kind ofly in this example, this booster circuit comprises a PWM control module 31, the 3rd electronic switch Q3, inductance L, a capacitor C 2, a capacitor C 3 and diode D; Wherein, first end 1 of the 3rd electronic switch Q3 is connected to the output of soft-start circuit 2 by inductance L, second end, 2 ground connection of the 3rd electronic switch Q3, and the control end 3 of the 3rd electronic switch Q3 connects PWM control modules 32; The anode of diode D is connected to first end 1 of the 3rd electronic switch Q3, and negative electrode connects load 4; One end of capacitor C 2 is connected to the negative electrode of diode, other end ground connection; One end of capacitor C 3 is connected to the output of described soft-start circuit, other end ground connection.As an embodiment of the present utility model, the 3rd electronic switch Q3 is a transistor, and Q3 is a negative-positive-negative transistor in this example.Inductance L is 10 μ H[rated current 5A], capacitor C 2, it is 25V that C3 is the 100uF[rated voltage].
Now the operation principle be used to control the relaxed starter that booster circuit opens is described in detail in detail in conjunction with Fig. 3, Fig. 4, soft-start circuit 2 is described as follows: DC power supply 1 starts moment, the second switch control circuit 22 controls second electronic switch Q2 conducting, produce pressure drop VGS between the source S of the first electronic switching tube Q1 and the grid G, work as V
GSValue is greater than the cut-in voltage V of the first electronic switching tube Q1
GS (TH)During value, the first electronic switching tube Q1 conducting.The RC loop that resistance R 2 and capacitor C 1 constitute forms the first electronic switch Q3 feedback control circuit 21, controls the grid of the first electronic switching tube Q1.When DC power supply 1 moment startup, the first electronic switching tube Q1 conducting, DC power supply 1 begins the charging to booster circuit input capacitance C3, and the booster circuit input voltage rises; Because can starting moment in DC power supply, capacitive load presents short-circuit condition, can produce a moment impact electric current, when output current moment rises to certain value, the first electronic switch Q1 feedback control circuit, 21 controls, the first switching tube Q1 that constitutes via resistance R 2 and capacitor C 1 is operated in linear model, the moment impact electric current is limited in this level, along with the booster circuit input voltage slowly rises, impulse current descends gradually, finish when booster circuit input capacitance C3 charging, impulse current drops to normal level; By the complete conducting of the first electronic switch Q3 feedback control circuit, the 21 control first electronic switching tube Q1 that resistance R 2 and capacitor C 1 constitute, DC power supply 1 output voltage inserts booster circuit 3.
As shown in Figure 2, before DC power supply 1 started, promptly during DC power supply 1 output low level, the second electronic switch Q2 was in off-state, and booster circuit 3 input voltages are low level; When DC power supply 1 output high level, promptly DC power supply 1 access soft-start circuit 2, the second electronic switch Q2 begin conducting, and booster circuit 3 input voltages begin to rise; Through after the slow startup of T time, booster circuit 3 input voltages slowly rise to DC power supply 1 voltage, booster circuit 3 complete places in circuit; So far finishing booster circuit 3 bringing onto loads 4 starts, the input voltage of booster circuit 3 slowly rises in this process, the immediate current that starts is controlled in a lower level, make DC power supply 1 output normal, avoided booster circuit 3 can produce great impulse current and caused supply power voltage moment to fall situation with the output voltage deficiency in the moment that DC power supply 1 is connected.
Usually, all there is interelectrode capacitance between three utmost points of field effect transistor; During making alive, produce a displacement current between DS, displacement current charges to grid capacitance, and pressure drop meets and exceeds cut-in voltage V gradually between the GS through making behind the certain hour
GS[TH]Thereby, make the field effect transistor conducting.By changing the time constant of feedback control loop R2 and C1, can control the size of displacement current, change the speed of gate capacitance charges, thereby change T start-up time.
Adopt the utility model circuit, when powering to booster circuit by switching tube in DC power supply moment, the input voltage of control booster circuit slowly rises, the heavy impulse current of avoiding booster circuit to occur in the moment that DC power supply is connected causes supply power voltage to fall and the output voltage deficiency, even the situation of circuit damage.Circuit is simple, is easy to realize.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. a DC power supply switch device comprises soft-start circuit and booster circuit, and described soft-start circuit input connects DC power supply, and output is connected to the booster circuit input, and the booster circuit output connects load; It is characterized in that:
Soft-start circuit comprises first electronic switch, second electronic switch, second switch control circuit, protective resistance and feedback control circuit;
Described first electronic switch is a field effect transistor; The source electrode of described field effect transistor connects dc power anode, and drain electrode is connected with booster circuit;
The second switch control circuit is connected to second electronic switch controling end, controls the break-make of described second electronic switch; First end of second electronic switch is connected to the grid of field effect transistor, and second end is connected to dc power cathode;
Protective resistance is connected between described field effect transistor source electrode and the grid; Described feedback control circuit is connected between described fet gate and the drain electrode.
2. DC power supply switch device as claimed in claim 1 is characterized in that: described feedback control circuit is the resistance electric capacity of connecting.
3. DC power supply switch device as claimed in claim 2 is characterized in that: described field effect transistor is the P-channel field-effect transistor (PEFT) pipe.
4. DC power supply switch device as claimed in claim 2 is characterized in that: described second electronic switch is a transistor.
5. DC power supply switch device as claimed in claim 4 is characterized in that: described transistor is a negative-positive-negative transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202134192U CN201708697U (en) | 2010-05-31 | 2010-05-31 | Direct-current power source switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202134192U CN201708697U (en) | 2010-05-31 | 2010-05-31 | Direct-current power source switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201708697U true CN201708697U (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202134192U Expired - Fee Related CN201708697U (en) | 2010-05-31 | 2010-05-31 | Direct-current power source switching device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201708697U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332901A (en) * | 2011-08-15 | 2012-01-25 | 苏州佳世达电通有限公司 | Switching circuit and display device |
| CN103199505A (en) * | 2013-05-02 | 2013-07-10 | 石家庄迅能电子科技有限公司 | Output short-circuit protection circuit for high tension battery |
| CN103441660A (en) * | 2013-03-06 | 2013-12-11 | 上海斐讯数据通信技术有限公司 | Direct current power supply slow starting circuit of gateway device |
| CN104300946A (en) * | 2014-10-23 | 2015-01-21 | 厦门福信光电集成有限公司 | Quick power-down module of low-voltage equipment |
| CN106505919A (en) * | 2016-12-30 | 2017-03-15 | 广东金莱特电器股份有限公司 | Inexpensive brushless motor booster circuit |
| CN106656129A (en) * | 2016-12-21 | 2017-05-10 | 贵州振华群英电器有限公司（国营第八九厂） | DC soft start solid state relay |
| CN110545038A (en) * | 2019-08-22 | 2019-12-06 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit and control method |
| CN110912095A (en) * | 2019-11-14 | 2020-03-24 | 中国航空工业集团公司西安航空计算技术研究所 | Overvoltage and impact current resistant starting circuit |
| CN111697823A (en) * | 2019-03-14 | 2020-09-22 | 深圳Tcl新技术有限公司 | Power switch circuit |
| CN112526615A (en) * | 2020-12-25 | 2021-03-19 | 青岛微探智能科技有限公司 | Magnetic fiber detector |
| CN114421286A (en) * | 2022-03-29 | 2022-04-29 | 北京福乐云数据科技有限公司 | Active fog ion generating device and control method thereof |
-
2010
- 2010-05-31 CN CN2010202134192U patent/CN201708697U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332901A (en) * | 2011-08-15 | 2012-01-25 | 苏州佳世达电通有限公司 | Switching circuit and display device |
| CN103441660A (en) * | 2013-03-06 | 2013-12-11 | 上海斐讯数据通信技术有限公司 | Direct current power supply slow starting circuit of gateway device |
| CN103199505A (en) * | 2013-05-02 | 2013-07-10 | 石家庄迅能电子科技有限公司 | Output short-circuit protection circuit for high tension battery |
| CN103199505B (en) * | 2013-05-02 | 2016-02-03 | 石家庄迅能电子科技有限公司 | Output short-circuit protection circuit for high tension battery |
| CN104300946A (en) * | 2014-10-23 | 2015-01-21 | 厦门福信光电集成有限公司 | Quick power-down module of low-voltage equipment |
| CN106656129A (en) * | 2016-12-21 | 2017-05-10 | 贵州振华群英电器有限公司（国营第八九厂） | DC soft start solid state relay |
| CN106505919A (en) * | 2016-12-30 | 2017-03-15 | 广东金莱特电器股份有限公司 | Inexpensive brushless motor booster circuit |
| CN111697823A (en) * | 2019-03-14 | 2020-09-22 | 深圳Tcl新技术有限公司 | Power switch circuit |
| CN110545038A (en) * | 2019-08-22 | 2019-12-06 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit and control method |
| CN110912095A (en) * | 2019-11-14 | 2020-03-24 | 中国航空工业集团公司西安航空计算技术研究所 | Overvoltage and impact current resistant starting circuit |
| CN112526615A (en) * | 2020-12-25 | 2021-03-19 | 青岛微探智能科技有限公司 | Magnetic fiber detector |
| CN114421286A (en) * | 2022-03-29 | 2022-04-29 | 北京福乐云数据科技有限公司 | Active fog ion generating device and control method thereof |
| CN114421286B (en) * | 2022-03-29 | 2022-06-24 | 北京福乐云数据科技有限公司 | Active fog ion generating device and control method thereof |
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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: 20110112 Termination date: 20190531 |