CN201087939Y - Improved construction of exchanging type power converter circuit - Google Patents
Improved construction of exchanging type power converter circuit Download PDFInfo
- Publication number
- CN201087939Y CN201087939Y CNU2007201812191U CN200720181219U CN201087939Y CN 201087939 Y CN201087939 Y CN 201087939Y CN U2007201812191 U CNU2007201812191 U CN U2007201812191U CN 200720181219 U CN200720181219 U CN 200720181219U CN 201087939 Y CN201087939 Y CN 201087939Y
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Abstract
The utility model relates to an improved structure of a switched power converter circuit, which is of a switched power converter circuit of a ring restricting switching system. The utility model mainly comprises a double junction transistor, a constant voltage regulator sensing circuit, an overcurrent protection circuit and an overvoltage protection circuit in a control circuit, thereby having multiple protection effect, ensuring voltage at the output end of a secondary winding is kept at a stable value, increasing the security for the using of electrical appliance products, and reaching the efficacies to shorten the volume and reduce the cost.
Description
Technical field
The utility model relates to a kind of improvement structure of exchange type power converter circuit, especially refer to a kind of power supply changeover device that is useful in small household electrical appliance, be mainly the exchange type power transducer of a kind of ring chokes converting system (Ringing ChokeConverter.RCC).
Background technology
Press, general small household electrical appliance, as: the electronic type sound equipment, videocorder, facsimile machine or charger for mobile phone ... etc., it all is DC power supply little by a power but that stability is preferable, convert general civil power to low-voltage DC for its use, described one existing exchange type power converter circuit, as shown in Figure 2, mainly by an AC power supplies 21 through a bridge rectifier 22 and a filter 23 after, produce the direct current of a high pressure, thereafter, again through a transformer 24 and an output rectification circuit 25, and the low voltage DC power supply of output required by electronic product is for use.
As shown in Figure 2, described existing exchange type power converter circuit is to use the RCC system, wherein and include a switching transistor (FET) 26, a starting resistance 27, a regenerative circuit 28, a control circuit 29 and a voltage detection circuit 30 and form; Constituted a RC delay circuit and comprise in the described control circuit 29 with electric capacity 292 by a resistance 291; After electric capacity 292 was charged to certain degree, described pair of junction transistor 293 just was unlocked, and the related grid voltage that makes switching transistor 26 descends, and reaches the effect of delay close switch transistor 26; And switching transistor 26 close before, its be have electric current by transformer 24 elementary winding 241 and be transformed into secondary winding 243 and be low-voltage DC; And the output of above-mentioned secondary winding 243 can charge to the electric capacity in the output rectification circuit 25 251 on the one hand, provides its required electric power to the electronic equipment that connects simultaneously on the other hand.
Again, when switching transistor 26 close after, the feedback winding 242 of transformer 24 produces the same polarity electric current of the 4th end to the 3 ends because of electromagnetic induction at this moment, promptly the voltage of the 3rd end can by negative value counter-rotating become on the occasion of, the electric current that discharges of electric capacity in regenerative circuit 28 281 is again to the gate charges of switching transistor 26 again, after the grid voltage of switching transistor 26 was raised to primary voltage Vt again, switching transistor 26 just can be opened once again and make that elementary winding 241 is sustainable to have electric current to pass through; Carry out same action so repeatedly and oneself concussion, elementary winding 241 is sustainable secondary winding 243 that current energy is passed to, and reaches the purpose that power supply uses.
Yet,, maintain a stationary value for making the voltage difference of transformer 24 between secondary winding 243 outputs (Vo and GND) as above-mentioned existing exchange type power converter circuit; Then be between secondary winding 243 2 outputs, to be connected with a voltage detection circuit 30, to detect the voltage difference of two ends too high and when reaching the breakdown voltage of voltage stabilizing didoe 301 of described voltage detection circuit 30 when it, light-emitting diode 302 wherein promptly is switched on luminous, and the photo-coupled transistor 294 in the control circuit 29 is opened, allow the positive voltage of feedback winding 242 the 3rd end that the gate charges of two junction transistors 293 is opened, so, the electric current of the elementary winding 241 of time-out that can be immediately passes through, voltage difference between secondary winding 243 2 outputs is no longer increased, it is reached keep output voltage values in certain scope.
Only, when the undertension of the AC power supplies 21 of above-mentioned available circuit, the induced voltage that is produced at the 3rd end of feedback winding 242 also can reduce; At this moment, control circuit 29 can't obtain enough voltage opens two junction transistors 293, promptly switching transistor 26 can't cut out, according to and, can cause elementary winding 241 to continue conduction equally, cause secondary winding 243 outputs voltage also continue to rise, and then be damaged and be connected the electric equipment products of described output; And wherein voltage detection circuit 30 is to have utilized light-emitting diode 302 and the photo-coupled transistor 294 in the control circuit 29 to make Coupling Control, according to and, it can increase the volume and the cost of manufacture thereof of entire circuit structure naturally.Be with, above-mentioned existing exchange type power converter circuit is being used and the disappearance of making, and is thinking that necessity of research improvement is again arranged.
This case utility model designer is because the defective of above-mentioned existing exchange type power converter circuit still has the space of research and development innovation again; Study intensively, and long-pending individual is engaged in the many years of experience of the design and the manufacturing of described product, a kind of improvement structure of brand-new exchange type power converter circuit is designed in research and development eventually.
Summary of the invention
The utility model main purpose is, provides a kind of improvement structure of exchange type power converter circuit, in order to overcome above-mentioned defective.
In order to achieve the above object, the improvement structure of the utility model exchange type power converter circuit, the rectifier, a transformer one switching transistor, a start-up circuit, an output rectification circuit and the control circuit that mainly include AC change DC are formed, wherein, described transformer includes an elementary winding, a feedback winding and a level winding; The 1st end of elementary winding is connected the positive terminal of rectifier, and the 2nd end is connected with the negative electricity end (ground connection) of rectifier by switching transistor; The 3rd end of feedback winding is connected to the grid of switching transistor through a regenerative circuit, and the 4th end connects the negative electricity end of rectifier through an electric capacity, can open once again after being used for making switching transistor to close; The the 5th and the 6th end of secondary winding is respectively just faradic/negative electricity output, and is connected with output rectification circuit, is to be used to provide electrical equipment to use; Switching transistor is to be used for controlling elementary winding conducting electric current whether switch; Start-up circuit is connected between the grid of the 1st end of elementary winding and switching transistor, needed starting resistor when being used to provide switching transistor and just opening; Its feature exists:
One control circuit is to be used for that control switch is transistorized closes opportunity, includes a pair of junction transistor, a voltage stabilizing circuit for detecting, a circuit overcurrent protection and an excess voltage protection; The base stage of two junction transistors is connected with the source electrode of switching transistor, and the collection utmost point is connected with the grid of switching transistor, and emitter-base bandgap grading is connected to negative electricity end (ground connection); The voltage stabilizing circuit for detecting comprises a voltage stabilizing didoe connects with a resistance, and the positive terminal of voltage stabilizing didoe is connected the base stage of two junction transistors, and the end in addition of resistance is connected to feedback winding the 4th end; Circuit overcurrent protection comprises two parallel resistor that are connected on the switching transistor source electrode, and the end in addition of one of them resistance is connected with the base stage of two junction transistors, and the end in addition of another resistance is connected to the negative electricity end; Excess voltage protection is the base stage that a positive terminal is connected two junction transistors, and end is connected to the voltage stabilizing didoe of feedback winding the 4th end in addition.
The beneficial effects of the utility model are compared with the prior art, when implementing according to above-mentioned structure, the voltage stabilizing circuit for detecting is to be connected to the negative electricity end and to feed back winding the 4th end mutually in succession by it, the voltage that feedback winding the 4th end is disengaged is capable of feedback to voltage stabilizing didoe, when described voltage stabilizing didoe reaches breakdown voltage, it can charge and open the base stage of two junction transistors, the related switching transistor that makes cuts out, to suspend elementary winding by electric current, the output voltage that reaches secondary winding maintains the effect of certain level; Secondly, circuit overcurrent protection is that the electric current that passes through when described switching transistor is when excessive, then can some electric current the base stage of two junction transistors be charged and open through parallel resistor, the related switching transistor that makes cuts out, to suspend elementary winding, reach the protection effect of overcurrent by electric current; Moreover; excess voltage protection is that the voltage that passes through when described switching transistor is when excessive; its the feedback winding electrification voltage also can with increase; when its voltage raises the breakdown voltage of the voltage stabilizing didoe that reaches described excess voltage protection; but the voltage of its back coupling then transistorized base stage of interface charges and opens, and reaches superpotential protection effect.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model;
Fig. 2 is the circuit diagram of existing exchange type power transducer.
Description of reference numerals: 11-rectifier; The 12-transformer; The 13-switching transistor; The 14-start-up circuit; The 15-output rectification circuit; The 16-regenerative circuit; The 17-control circuit; The elementary winding of 121-; 122-feeds back winding; The 123-secondary winding; The two junction transistors of 171-; 172-voltage stabilizing circuit for detecting; The 173-circuit overcurrent protection; The 174-excess voltage protection; 175-electric capacity; The 1721-voltage stabilizing didoe; 1722-resistance; 1731,1732-resistance; The 21-AC power supply; The 22-rectifier; The 23-filter; The 24-transformer; The 25-output rectification circuit; The 26-switching transistor; 27-resistance; The 28-regenerative circuit; The 29-control circuit; The 30-current-sensing circuit; The elementary winding of 241-; 242-feeds back winding; The 243-secondary winding; 251,281-electric capacity; 291-resistance; 292-electric capacity; The two junction transistors of 293-; The 294-photo-coupled transistor; The 301-voltage stabilizing didoe; The 302-light-emitting diode.
Embodiment
Below in conjunction with accompanying drawing, to this novel above-mentionedly is described in more detail with other technical characterictic and advantage.
At first see also shown in Figure 1, the improvement structure of the utility model exchange type power converter circuit, the rectifier 11, a transformer 12, a switching transistor 13, a start-up circuit 14, an output rectification circuit 15, a regenerative circuit 16 and the control circuit 17 that mainly include AC change DC are formed, wherein, described transformer 12 includes an elementary winding 121, a feedback winding 122 and a level winding 123; The 1st end of elementary winding 121 is connected the positive terminal of rectifier 11, and the 2nd end is connected to the negative electricity end of rectifier 11 by switching transistor 13; The 3rd end of feedback winding 122 is connected to the grid of switching transistor 13 through a regenerative circuit 16, and the 4th end connects the negative electricity end of rectifiers 11 through an electric capacity 175, is used for making the unlatching that switching transistor 13 can be once again after being closed; The the 5th and the 6th end of secondary winding 123 is respectively just faradic/negative electricity output, and is connected with output rectification circuit 15, is the electric power that is used to provide the electrical equipment use that is connected; Switching transistor 13 is to be used for controlling elementary winding 121 conducting electric current whether electronic switchs; Start-up circuit 14 is connected between the grid of the 1st end of elementary winding 121 and switching transistor 13, in order to switching transistor 13 required voltage when first unlatching of power supply to be provided; Its feature exists:
One control circuit 17 is to be used for the cutting out opportunity of control switch transistor 13, includes a pair of junction transistor 171, a voltage stabilizing circuit for detecting 172, a circuit overcurrent protection 173 and an excess voltage protection 174; The base stage of two junction transistors 171 is connected with the source electrode of switching transistor 13, and the collection utmost point is connected with the grid of switching transistor 13, and emitter-base bandgap grading is connected to the negative electricity end; Voltage stabilizing circuit for detecting 172 includes the voltage stabilizing didoe 1721 and resistance 1722 of a series connection, and the positive terminal of voltage stabilizing didoe 1721 is connected the base stage of two junction transistors 171, and the end in addition of resistance 1722 is connected to feedback winding the 4th end; Circuit overcurrent protection 173 comprises two parallel resistances 1731,1732 that are connected on switching transistor 13 source electrodes, and the end in addition of one of them resistance 1731 is connected with the base stage of two junction transistors 171, and the end in addition of another resistance 1732 is connected to the negative electricity end; Excess voltage protection 174 is the base stage that a positive terminal is connected two junction transistors 171, and end is connected to the voltage stabilizing didoe of feedback winding the 4th end in addition.
When implementing according to above-mentioned structure, voltage stabilizing circuit for detecting 172 be by its be connected to the negative electricity end with the feedback winding 122 the 4th end mutually in succession, the voltage voltage stabilizing didoe 1721 to voltage stabilizing circuit for detecting 172 capable of feedback that feedback winding 122 the 4th end is disengaged, when described voltage stabilizing didoe 1721 reaches breakdown voltage, it can charge and open the base stage of two junction transistors 171, the related magnitude of voltage that makes switching transistor 13 gate terminal reduces and closes, to suspend elementary winding by electric current, the output voltage that reaches secondary winding 123 maintains the effect of certain level value; Secondly, circuit overcurrent protection 173 is that the electric current that passes through when described switching transistor 13 is when excessive, then can some electric current charge and open through the base stage of the two junction transistors 171 of 1731 pairs of parallel resistor, the same switching transistor 13 that makes that can be related cuts out, to suspend elementary winding 121, reach the protection effect of overcurrent by electric current; Moreover; excess voltage protection 174 is that the voltage that passes through when described switching transistor 13 is when excessive; its the feedback winding 122 electrification voltage also can with increase; when its voltage raises the breakdown voltage of the voltage stabilizing didoe that reaches described excess voltage protection 174; the voltage of being feedback by feedback winding 122 the 4th end then can charge and opens the base stage of two junction transistors 171, reaches superpotential protection effect.
As mentioned above, employed voltage stabilizing circuit for detecting 172 in the utility model, between the base stage that is provided in a side of two junction transistors 171 and the 4th end that feeds back winding 122, it promptly is the primary side that is set directly at transformer 12, and there are not to use existing control circuit LED P D commonly used and the control member of photo-coupled transistor PT, to can effectively reaching the volume that dwindles power supply changeover device, with the effect that reduces its manufacturing cost.
In sum, the improvement of the utility model exchange type power converter circuit structure " can reach multiple protection really, with reduced volume and the effect that reduces manufacturing cost, and then increase the practicality and the economic worth of described product; Again, being configured in of this case proposes do not have identical items or technology to see in publication or public use before the patent application; Be to meet novel patent requirement, propose the application of novel patent in accordance with the law with this case.
More than explanation is novel just illustrative for this; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.
Claims (1)
1. the improvement of an exchange type power converter circuit is constructed, it includes rectifier, a transformer, a switching transistor, a start-up circuit, an output rectification circuit, a regenerative circuit and a control circuit that an AC becomes DC, wherein, described transformer includes an elementary winding, a feedback winding and a level winding; The 1st end of described elementary winding is connected the positive terminal of described rectifier, and the 2nd end connects the negative electricity end of described rectifier by described switching transistor; The 3rd end of described feedback winding is connected to the grid of described switching transistor through described regenerative circuit, and the 4th end connects the negative electricity end of described rectifier through an electric capacity, can open after being used for making described switching transistor to close again; The the 5th and the 6th end of described secondary winding is respectively just faradic/negative electricity output, and is connected with the described rectification circuit of output, is used to provide electrical equipment and uses; Described switching transistor is to be used for controlling described elementary winding conducting electric current whether switch; Described start-up circuit is connected between the grid of the 1st end of described elementary winding and described switching transistor, required voltage when providing described switching transistor just to open; Its feature exists:
Described control circuit is to be used for that control switch is transistorized closes opportunity, and it includes a pair of junction transistor, a voltage stabilizing circuit for detecting, a circuit overcurrent protection and an excess voltage protection; The base stage of two junction transistors is connected with the source electrode of switching transistor, and the collection utmost point is connected with the grid of described switching transistor, and emitter-base bandgap grading is connected to the negative electricity end; Described voltage stabilizing circuit for detecting comprises a voltage stabilizing didoe connects with a resistance, and the positive terminal of described voltage stabilizing didoe is connected the base stage of two junction transistors, and the end in addition of resistance is connected to feedback winding the 4th end; Described circuit overcurrent protection comprises two parallel resistances that are connected on the switching transistor source electrode, and the end in addition of one of them resistance is connected with the base stage of two junction transistors, and the end in addition of another resistance is connected to the negative electricity end; Described excess voltage protection is the base stage that a positive terminal is connected two junction transistors, and end is connected to the voltage stabilizing didoe of feedback winding the 4th end in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201812191U CN201087939Y (en) | 2007-10-19 | 2007-10-19 | Improved construction of exchanging type power converter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201812191U CN201087939Y (en) | 2007-10-19 | 2007-10-19 | Improved construction of exchanging type power converter circuit |
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| CN201087939Y true CN201087939Y (en) | 2008-07-16 |
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| CNU2007201812191U Expired - Lifetime CN201087939Y (en) | 2007-10-19 | 2007-10-19 | Improved construction of exchanging type power converter circuit |
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- 2007-10-19 CN CNU2007201812191U patent/CN201087939Y/en not_active Expired - Lifetime
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Granted publication date: 20080716 |