CN203482090U - Quick starting circuit - Google Patents
Quick starting circuit Download PDFInfo
- Publication number
- CN203482090U CN203482090U CN201320573394.0U CN201320573394U CN203482090U CN 203482090 U CN203482090 U CN 203482090U CN 201320573394 U CN201320573394 U CN 201320573394U CN 203482090 U CN203482090 U CN 203482090U
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- Prior art keywords
- control unit
- start circuit
- fast start
- pulse transformer
- power supply
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Abstract
Provided in the utility model is a quick starting circuit for a switching power supply. The quick starting circuit comprises: a switching unit (18), which is connected between a rectification and filtering unit (13/23) and a control unit (17); and a switching control unit (19), which is connected between a pulse transformer (14/24) and the switching unit (18). When the switching power supply is powered up, the switching unit (18) is conducted, so that the control unit (17) provides a working voltage; the pulse transformer (14/24) is started under the effect of the control unit (17); the started control unit (17) provides the working voltage for the control unit (17); and the turning on and off of the switching unit (18) is controlled by the switching control unit (19).
Description
Technical field
The utility model relates to a kind of fast start circuit for Switching Power Supply, relates in particular to a kind of for the fast start circuit in earth leakage protective device (Residual Current Protection Device, RCD).
Background technology
Earth leakage protective device (RCD) is a kind of widely used circuit protector, is used for opening circuit breaker in main circuit with the power supply of cutting off the electricity supply when equipment generation leak current fault, thereby prevents the generation of electric shock accidents.In current earth leakage protective device, generally adopt Switching Power Supply (Switching Mode Power Supply, SMPS) to power to it.The structure of Switching Power Supply of the prior art as shown in Figure 1, generally includes: AC power supplies 1 can be single-phase, three-phase three-wire system, the input of three-phase four-wire system AC power; Surge voltage protection unit 2, for resisting the destruction of outside surge voltage; Rectification and filter unit 3, for alternating current is converted to direct current, and reduce the fluctuation of voltage by filter capacitor wherein; Pulse transformer 4, for receiving electric energy from rectification and filter unit 3, and realizes former limit to the transmission of secondary energy; Control unit 7, for the turn-on and turn-off of control impuls transformer 4; Secondary output unit 5, for receiving electric energy and power to RCD from Pulse Electric depressor 14; Feedback unit 6, receives signal from secondary output unit, and provides feedback signal to control unit 7, and control unit 7 is according to the turn-on and turn-off of this feedback signal control impuls transformer 4, thus the duty ratio of adjustment System or operating frequency.The moment powering on, rectification and filter unit 3 are to the V of the control chip U in control unit 7
sTRpin provides starting resistor, and after control chip is activated, pulse transformer 4 provides voltage to the Vcc pin of control chip, makes V
sTRpin is invalid, and the feedback control loop that pulse transformer 4, secondary output unit 5, feedback unit 6, control unit 7 form afterwards reaches stable after a period of time after powering on, and realizes the stable power-supplying to RCD.
A physical circuit figure of Switching Power Supply as shown in Figure 2, wherein at length shows the details of rectification and filter unit, pulse transformer, control unit.As shown in Figure 2, after powering on, the rectification filtering unit consisting of four diode Da, Db, Dc, Dd and capacitor Cf is to the V of control chip
sTRpin provides starting resistor to start this control chip, after this control chip starts, between its pin Drain and pin GND, can be switched on, thereby make two ends, the former limit of pulse transformer be coupled with voltage, the voltage at two ends, former limit is passed on the one hand the secondary of pulse transformer and continues to be delivered to secondary output unit, at the auxiliary winding two ends of former limit one side, generate voltage on the other hand, the voltage of this auxiliary winding is provided for the Vcc pin of control chip so that control chip work, at this moment V
sTRpin is invalid, and so far, the startup work of control chip completes.
This shows, from the V of control chip
sTRpin is powered Vcc pin needs the regular hour between being powered, and is generally called the soft-start time of chip.For example, for the FSL138MRT chip of Fairchild, soft-start time is 15 milliseconds.Therefore, the existence of soft-start time can affect the start-up time of Switching Power Supply greatly.
From Switching Power Supply, start to supply power to RCD and reach normal operating conditions, intermediate demand completes the actions such as power initiation, signal processing and analysis.If before RCD reaches normal operating conditions during this period of time in there is electric leakage accident, RCD cannot promptly cut off leak current fault.Yet it is very crucial cutting off rapidly, timely leak current fault.According to the regulation of appendix B in standard IEC 60947-2, the in the situation that of 5 times of leakage currents, the maximum actuation time is 40 milliseconds.This just requires in 40 milliseconds, to complete the actions such as power initiation, signal processing and analysis, triggering dropout.Therefore just there is certain restriction the start-up time of power supply.General solution is the power that increases Switching Power Supply, reaches the object that improves start-up time.But this solution needs the transformer that volume is larger, take up room large, and increased cost.
Utility model content
The utility model aims to provide a kind of fast start circuit for Switching Power Supply, can avoid the soft-start time of the control chip in control unit, thereby shortens the start-up time of Switching Power Supply.
The utility model provides a kind of fast start circuit for Switching Power Supply, described Switching Power Supply comprise rectification and filter unit (13,23), for receive described rectification and filter unit (13,23) output galvanic pulse transformer (14,24), be used to described pulse transformer (14,24) that the control unit (17) of modulation signal is provided, it is characterized in that, described fast start circuit comprises:
Switch element (18), is connected between described rectification and filter unit (13,23) and described control unit (17);
Switch control unit (19), is connected between described pulse transformer (14,24) and described switch element (18);
Wherein, when described Switching Power Supply powers up, described switch element (18) conducting, think that described control unit (17) provides operating voltage, described pulse transformer (14,24) starts under the effect of described control unit (17), pulse transformer after startup (14,24) provides operating voltage to described control unit (17), controls described switch element (18) simultaneously turn-off by described switch control unit (19).This fast start circuit can be avoided the soft-start time of the control chip in control unit, thereby shortens the start-up time of Switching Power Supply
The fast start circuit providing according to the utility model, wherein said pulse transformer (14,24) has auxiliary winding (T3), and to described control unit, provides operating voltage by auxiliary winding (T3).
The fast start circuit providing according to the utility model, wherein said pulse transformer (14,24) has auxiliary winding (T3), and to described switch control unit (19), provides voltage by auxiliary winding (T3).
The fast start circuit providing according to the utility model, is connected with diode (D7) between wherein said pulse transformer (14,24) and described control unit.
The fast start circuit providing according to the utility model, is connected with resistor (R4) between wherein said pulse transformer (14,24) and described switch control unit (19).
The fast start circuit providing according to the utility model, wherein said switch element (18) comprises switching tube.
The fast start circuit providing according to the utility model, wherein said switching tube comprises metal-oxide-semiconductor, igbt, triode, power switch pipe.
The fast start circuit providing according to the utility model, wherein said switch control unit (19) comprises switching tube.
The fast start circuit providing according to the utility model, wherein said switching tube comprises metal-oxide-semiconductor, igbt, triode, power switch pipe.
The fast start circuit providing according to the utility model, wherein said switch element (18) consists of the first switching tube (Q1), described switch control unit (19) consists of second switch pipe (Q3), described fast start circuit also comprises the first voltage stabilizing didoe (D9) and the first resistor (R1), the first voltage stabilizing didoe (D9) and the first resistor (R1) are connected on described rectification and filter unit (13, 23) between both positive and negative polarity, between the first voltage stabilizing didoe (D9) and the first resistor (R1), there is first node (J1), this first node (J1) is connected to described the first switching tube (Q1) to control its conducting or shutoff, described second switch pipe (Q3) is at described pulse transformer (14, 24) under effect, make described first node (J1) in high level or low level.
The utility model also provides a kind of Switching Power Supply that comprises above-mentioned fast start circuit.
The utility model also provides a kind of leakage protection system with Switching Power Supply, and wherein said Switching Power Supply has above-mentioned fast start circuit.
The fast start circuit that the utility model provides; can avoid the soft-start time of the control chip in control unit; shorten the start-up time of Switching Power Supply; reduce the power of whole power supply; without the larger transformer of volume; cost is low, and capable of fast starting can meet the requirement of operate time of earth leakage protective product for earth leakage protective device.
Accompanying drawing explanation
The following drawings is only intended to the utility model to schematically illustrate and explain, does not limit scope of the present utility model.Wherein,
Fig. 1 is the structural representation of Switching Power Supply of the prior art;
Fig. 2 is the circuit diagram of an illustrative switch power supply of the prior art;
Fig. 3 is the structural representation according to Switching Power Supply of the present utility model;
Fig. 4 is according to the circuit diagram of the Switching Power Supply of an embodiment of the present utility model.
Embodiment
The utility model provides a kind of Switching Power Supply capable of fast starting, on the basis of Switching Power Supply in the prior art, increased fast start circuit unit, and make this fast start circuit unit directly to the Vcc pin of the control chip in control unit, provide voltage, make control chip reach fast operating voltage, thereby avoided the soft-start time of control chip, and then shortened the start-up time of Switching Power Supply.
The structure of the Switching Power Supply with fast start circuit unit that the utility model provides as shown in Figure 3, comprising:
Surge voltage protection unit 12, for resisting the destruction of outside surge voltage;
Rectification and filter unit 13, for alternating current is converted to direct current, and reduce the fluctuation of voltage by filter capacitor wherein;
Pulse transformer 14, for receiving electric energy from rectification and filter unit 13, and realizes former limit to the transmission of secondary energy;
Fast start circuit unit 10, comprise switch element 18 and for the switch control unit 19 of the turn-on and turn-off of control switch unit 18, wherein switch element 18 is connected between the Vcc pin of the control chip in rectification and filter unit 13 and control unit 17, for the direct voltage of controlling 13 outputs of rectification and filter unit to switch element 18 conductings or shutoff.
The moment powering on, switch element 18 conductings, rectification and filter unit 13 provide starting resistor via switch element 18 to the Vcc pin of the control chip in control unit 17, thereby after being activated, control chip will cause being powered and being activated on pulse transformer 14, power up afterpulse transformer 14 and provide voltage to switch control unit 19, also to the Vcc pin of control chip, provide voltage simultaneously, under the effect of the voltage that switch control unit 19 provides at pulse transformer 14, make switch element 18 turn-off, thereby disconnect the power supply of the Vcc pin of rectification and 13 pairs of control chips of filter unit.Now, the Vcc pin of control chip is powered by pulse transformer 14.The feedback control loop that pulse transformer 14, secondary output unit 15, feedback unit 16, control unit 17 form afterwards reaches stable after a period of time after powering on, and realizes the stable power-supplying to RCD.
For technical characterictic of the present utility model, object and effect being had more clearly, understand, now contrast accompanying drawing embodiment of the present utility model is described.
The present embodiment provides a kind of Switching Power Supply with fast start circuit unit, its circuit structure as shown in Figure 4, wherein at length show fast start circuit unit structure and with the annexation of rectification and filter unit, pulse transformer, control unit.The circuit structure of the Switching Power Supply that the present embodiment provides comprises:
Ac current source (AC), for AC electric current is provided, can built-in surge voltage protection unit (not shown) in this ac current source (AC);
Rectification and filter unit, comprise the rectifier bridge and the capacitor C1 that diode D1, D2, D3 and D4, consist of;
Pulse transformer 24, realizes former limit winding T1 to the transmission of secondary winding T3 energy;
Control chip U1, for the turn-on and turn-off of control impuls transformer 24;
Secondary output unit 25, for receiving electric energy and provide voltage Vo to RCD from Pulse Electric depressor 24;
Feedback unit 26, by optocoupler, U2 forms, and receives signal, and provide feedback signal to the feedback pin (FB) of control chip U1 from secondary output unit, control chip U1 is according to the turn-on and turn-off of this feedback signal control impuls transformer 24, thus the duty ratio of adjustment System or operating frequency;
Fast start circuit unit 10, comprises metal-oxide-semiconductor Q1, igbt (IGBT) Q3, resistor R1, R2 and R4, zener diode D9, D10 and diode D7, D8.As shown in Figure 4, wherein, voltage stabilizing didoe D9 and resistor R1 are connected between rectification and the both positive and negative polarity of filter unit 23, between the two, there is node J1, this node J1 is connected to the grid of metal-oxide-semiconductor Q1, between node J1 and the drain electrode of metal-oxide-semiconductor, have zener diode D10 in addition, the source electrode of metal-oxide-semiconductor Q1 is connected to the positive pole of rectification and filter unit 23 by resistor R2, and the drain electrode of metal-oxide-semiconductor Q1 is connected to the Vcc pin of control chip U1 by diode D8.One end ground connection of the auxiliary winding T3 of pulse transformer 24, the other end is connected to the Vcc pin of control chip U1 on the one hand by diode D7, also by resistor R4, be connected on the other hand the base stage of IGBT Q3, the collector electrode of IGBT Q3 is connected to node J1, grounded emitter.Wherein utilize diode D7 and D8 one-way conduction character and in circuit, play the effect of isolation.
While starting working, from the voltage of rectification and filter unit 23 outputs, be applied to the two ends of voltage stabilizing didoe D9 and the resistor R1 of series connection, thereby the node J1 between these two provides voltage, the voltage of node J1 is provided to the grid of metal-oxide-semiconductor Q1, and utilize voltage stabilizing didoe pipe D10 to form stable voltage between the grid of metal-oxide-semiconductor Q1 and drain electrode, the voltage of J1 node makes the source of metal-oxide-semiconductor Q1, drain electrode conducting, thereby make the electric current of rectification and filter unit 23 outputs pass through successively resistor R2, Q1, diode D8 arrives the Vcc pin of control chip U1, after Vcc pin is powered, between the Drain pin of control chip U1 and GND pin, can be switched on, thereby make the winding T1 two ends, former limit of pulse transformer 24 be coupled with voltage, the voltage of former limit winding T1 is passed to the secondary winding T3 of pulse transformer 24 on the one hand, at the auxiliary winding T2 two ends of former limit one side, generate voltage on the other hand, the voltage that auxiliary winding T2 inducts is provided for the Vcc pin of control chip U1 on the one hand via diode D7, via resistor R4, be provided on the other hand the base stage of IGBT Q3 simultaneously, make the collector and emitter conducting of IGBT Q3, at this moment the level of node J1 is dragged down, cause the shutoff of metal-oxide-semiconductor Q1, cause rectification and filter unit 23 no longer to the Vcc pin powered of control chip U1, Vcc pin is by assisting winding T2 to power afterwards.Then the feedback control loop that pulse transformer 24, secondary output unit 25, feedback unit 26, control unit 27 form reaches stable after a period of time, to RCD, provides burning voltage Vo.
From the present embodiment, can find out, in fast start circuit unit, metal-oxide-semiconductor Q1 is connected to the effect of playing switch between rectification and the Vcc pin of filter unit 23 and control chip, and the collector electrode of IGBT Q3 is connected to the grid of metal-oxide-semiconductor Q1 and play the conducting of metal-oxide-semiconductor or the effect of shutoff controlled.The voltage of rectification and filter unit 23 can make metal-oxide-semiconductor Q1 conducting, and to the Vcc pin powered of control chip U1, thereby open control chip U1, is powered causing on pulse transformer 24.Pulse transformer 24 is the Vcc pin powered to control chip U1 by auxiliary winding T3 one side again, to IGBT Q3, provide voltage on the other hand, thereby make IGBT Q3 turn-off metal-oxide-semiconductor Q1, and then cut off the power supply of the Vcc pin of rectification and 23 couples of control chip U1 of filter unit.
The fast start circuit unit that the present embodiment provides; without the Vstr pin powered to control chip; can avoid the soft-start time of the control chip in control unit; shorten the start-up time of Switching Power Supply; reduce the power of whole power supply; without the larger transformer of volume, cost is low, can meet the requirement of operate time of earth leakage protective product.
According to other embodiment of the present utility model, wherein the components and parts in foregoing circuit are also nonrestrictive, those skilled in the art can also adopt the components and parts that other function is identical to replace, for example Q1, Q2 can also be the switching tube of other form, such as metal-oxide-semiconductor, IGBT, triode, power switch pipe etc.
Above-described embodiment provides a kind of concrete circuit of realizing the technical solution of the utility model, but those skilled in the art also can adopt other circuit form to realize the utility model, for example, adopt other form to form switch element and switch control unit.
Be to be understood that, although this specification is described according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, technical scheme in each embodiment also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
The foregoing is only the schematic embodiment of the utility model, not in order to limit scope of the present utility model.Any those skilled in the art, is not departing from equivalent variations, modification and the combination of doing under the prerequisite of design of the present utility model and principle, all should belong to the scope of the utility model protection.
Reference numerals list
Claims (12)
1. the fast start circuit for Switching Power Supply, described Switching Power Supply comprise rectification and filter unit (13,23), for receive described rectification and filter unit (13,23) output galvanic pulse transformer (14,24), be used to described pulse transformer (14,24) that the control unit (17) of modulation signal is provided, it is characterized in that, described fast start circuit comprises:
Switch element (18), is connected between described rectification and filter unit (13,23) and described control unit (17);
Switch control unit (19), is connected between described pulse transformer (14,24) and described switch element (18);
Wherein, when described Switching Power Supply powers up, described switch element (18) conducting, think that described control unit (17) provides operating voltage, described pulse transformer (14,24) starts under the effect of described control unit (17), pulse transformer after startup (14,24) provides operating voltage to described control unit (17), controls described switch element (18) simultaneously turn-off by described switch control unit (19).
2. fast start circuit according to claim 1, is characterized in that, described pulse transformer (14,24) has auxiliary winding (T3), and to described control unit, provides operating voltage by auxiliary winding (T3).
3. fast start circuit according to claim 1, is characterized in that, described pulse transformer (14,24) has auxiliary winding (T3), and to described switch control unit (19), provides voltage by auxiliary winding (T3).
4. fast start circuit according to claim 1, is characterized in that, between described pulse transformer (14,24) and described control unit, is connected with diode (D7).
5. fast start circuit according to claim 1, is characterized in that, between described pulse transformer (14,24) and described switch control unit (19), is connected with resistor (R4).
6. fast start circuit according to claim 1, is characterized in that, described switch element (18) comprises switching tube.
7. fast start circuit according to claim 6, is characterized in that, described switching tube comprises metal-oxide-semiconductor, igbt, triode, power switch pipe.
8. fast start circuit according to claim 1, is characterized in that, described switch control unit (19) comprises switching tube.
9. fast start circuit according to claim 8, is characterized in that, described switching tube comprises metal-oxide-semiconductor, igbt, triode, power switch pipe.
10. fast start circuit according to claim 1, it is characterized in that, described switch element (18) consists of the first switching tube (Q1), described switch control unit (19) consists of second switch pipe (Q3), described fast start circuit also comprises the first voltage stabilizing didoe (D9) and the first resistor (R1), the first voltage stabilizing didoe (D9) and the first resistor (R1) are connected on described rectification and filter unit (13, 23) between both positive and negative polarity, between the first voltage stabilizing didoe (D9) and the first resistor (R1), there is first node (J1), this first node (J1) is connected to described the first switching tube (Q1) to control its conducting or shutoff, described second switch pipe (Q3) is at described pulse transformer (14, 24) under effect, make described first node (J1) in high level or low level.
11. 1 kinds of Switching Power Supplies, is characterized in that: comprise fast start circuit as claimed in claim 1.
12. 1 kinds of leakage protection systems with Switching Power Supply, is characterized in that described Switching Power Supply has fast start circuit as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573394.0U CN203482090U (en) | 2013-09-16 | 2013-09-16 | Quick starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320573394.0U CN203482090U (en) | 2013-09-16 | 2013-09-16 | Quick starting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203482090U true CN203482090U (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320573394.0U Expired - Fee Related CN203482090U (en) | 2013-09-16 | 2013-09-16 | Quick starting circuit |
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| CN (1) | CN203482090U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852562A (en) * | 2015-05-04 | 2015-08-19 | 黔西南州首创电子科技有限公司 | Low-loss universal starting circuit of switching power chip |
| TWI655836B (en) * | 2017-06-19 | 2019-04-01 | 擎力科技股份有限公司 | Isolated power supply and method of controlling isolated power supply |
-
2013
- 2013-09-16 CN CN201320573394.0U patent/CN203482090U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852562A (en) * | 2015-05-04 | 2015-08-19 | 黔西南州首创电子科技有限公司 | Low-loss universal starting circuit of switching power chip |
| TWI655836B (en) * | 2017-06-19 | 2019-04-01 | 擎力科技股份有限公司 | Isolated power supply and method of controlling isolated power supply |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20200916 |
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| CF01 | Termination of patent right due to non-payment of annual fee |