CN2580675Y - Lossless absorption circuit used for normal/reverse excitation transducer - Google Patents

Lossless absorption circuit used for normal/reverse excitation transducer Download PDF

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Publication number
CN2580675Y
CN2580675Y CN 02261508 CN02261508U CN2580675Y CN 2580675 Y CN2580675 Y CN 2580675Y CN 02261508 CN02261508 CN 02261508 CN 02261508 U CN02261508 U CN 02261508U CN 2580675 Y CN2580675 Y CN 2580675Y
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diode
negative
positive
capacitor
absorption circuit
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CN 02261508
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Chinese (zh)
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钱龙圣
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Abstract

The utility model relates to a lossless absorption circuit used for a normal excitation transducer /a reverse excitation transducer, which is arranged in the normal excitation type transducer or the reverse excitation type transducer. The lossless absorption circuit is an H type network composed of a capacitor, an inductor and diodes, wherein the positive ends of diodes D1 and D2 which are connected in series in the same direction are connected with the negative end of an input power source, and the negative ends are connected with the positive end of the input power source; one end of the inductor L1 is connected between the diode D2 and the diode D1, and the other end of the inductor L1 is connected with a positive electrode of a diode D3 and one end of the capacitor C2; the other end of the capacitor C2 is connected with a positive electrode of a switch element Q; a negative electrode of the diode D3 is connected with the positive electric potential end of a first coil of a transformer in excitation. The utility model has the characteristics of simple circuit structure, reasonable layout, few attached elements, no need of the extra auxiliary switching circuit, no energy loss element in the circuit, capability of increasing the work efficiency of the transducer, etc.

Description

The lossless absorption circuit that is used for positive and negative exciting converter
Technical field
The utility model relates to a kind of lossless absorption circuit, especially relates to a kind of improvement that is used for the lossless absorption circuit structure of positive and negative exciting converter.
Background technology
Conventional positive and negative exciting converter has two or an active switch pipe, two or a clamp diode, be generally hard switching work, in recent years, many soft switch circuits have appearred in succession, mainly contain two kinds: the one, additional in converter circuit have auxiliary switch element, and the 2nd, the additional passive buffer circuit that contains resistance, electric capacity.Patent retrieval is found, someone has applied for the patent (01118936.3) of " Zero-voltage zero-current soft-switch converter " by name, it discloses a kind of Zero-voltage zero-current soft-switch converter, comprise the basic circuit that has master power switch and power diode, also comprise auxiliary power switch, the or two, diode, resonant capacitance, resonant inductance.It is characterized in that: between the energy storage inductor of boost inverter and power diode, seal in resonant inductance, make the current stress when loss of converter master power switch and power diode turn-off greatly reduce, simultaneously, realized the soft switch of master power switch, auxiliary power switch and booster diode.Also have the patent of the patent (00133291.0) of a kind of " the single-ended isolated DC of soft switch/direct current forward converter " by name, it relates to transformation of electrical energy device, especially DC converter.It comprises transformer TX, master power switch M1 and corresponding output loop, control loop etc., it is characterized by and between the drain electrode of master power switch M1 and source electrode, increase the buffering and a loop of forming by auxiliary power switch M2 and diode, electric capacity, inductance etc. that resets, can realize the harmless switching of master power switch and auxiliary power switch, and transformer can be undertaken from resetting by this converter.But, this class soft switch circuit or the extra auxiliary switching circuit of needs, number of elements is many, circuit complexity, cost of manufacture height, poor reliability; The circuit energy loss is big, causes the circuit working decrease in efficiency.
Summary of the invention
The utility model mainly is to solve the existing in prior technology soft switch circuit or need extra auxiliary switching circuit, and number of elements is many, circuit complexity, cost of manufacture height, poor reliability; The circuit energy loss is big, causes the technical problem of circuit working decrease in efficiency etc.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of lossless absorption circuit that is used for positive and negative exciting converter, be arranged in positive activation type or the inverse excitation type converter, described lossless absorption circuit is the H type network that is made of electric capacity, inductance and diode, wherein the diode D that is connected in series in the same way 1With diode D 2Anode with the input power supply negative terminal join, its negative terminal with the input power supply anode link to each other; At described diode D 2With diode D 1Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the anode of switch element Q join; And diode D 3The positive potential end of negative pole when being connected to the primary coil excitation of transformer.
As preferably, described diode D 3Negative pole and another switch element Q 1Negative electrode join and this switch element Q 1Anode with the input power supply anode link to each other.
As preferably, described diode D 1Negative terminal and diode D 3Negative terminal be connected to the input power supply anode.
As preferably, go back forward between the positive potential end the when negative electrode of described switch element Q and primary coil excitation and be serially connected with diode D 5
As preferably, negative potential end and another switch element Q during described primary coil excitation 1Anode between also oppositely be serially connected with diode D 4
As preferably, described inductance L 1With capacitor C 2Resonance half period T/2 much smaller than the switch half period T of switching tube Q 0
Therefore, it is simple, rationally distributed to the utlity model has circuit structure, and add ons quantity is few, need not extra auxiliary switching circuit, and does not have the energy loss element in the circuit, can improve the characteristics such as operating efficiency of converter.
Description of drawings
Accompanying drawing 1 is a dual switch positive activation type structural representation of the present utility model;
Accompanying drawing 2 is single switching tube positive activation type structural representations of the present utility model;
Accompanying drawing 3 is dual switch inverse-excitation type structural representations of the present utility model;
Accompanying drawing 4 is single switching tube inverse-excitation type structural representations of the present utility model.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of lossless absorption circuit that is used for positive and negative exciting converter, be arranged in positive activation type or the inverse excitation type converter, described lossless absorption circuit is the H type network that is made of electric capacity, inductance and diode.This network can be used for dual switch positive activation type switching circuit, can also be used for single switching tube positive activation type circuit and single, double switching tube switch flyback switch circuit.
Embodiment 1: with reference to the accompanying drawings 1, and diode D 1With diode D 2Be connected in series diode D in the same way 1Negative terminal with the input power supply anode link to each other diode D 2Anode with the input power supply negative terminal join, at described diode D 1With diode D 2Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the negative potential end during the primary coil excitation of transformer join, the anode with switch element Q joins again, the negative electrode of switch element Q joins with the input power supply negative terminal, goes back forward serial connection diode D afterwards 5Positive potential end when being connected to the primary coil excitation of transformer again, diode D 3The positive potential end of negative pole when being connected to the primary coil excitation of transformer, diode D 3Negative pole again with another switch element Q 1Negative electrode join and this switch element Q 1Anode link to each other with the anode of input power supply, also oppositely be connected in series diode D afterwards 4Negative potential end when being connected to the primary coil excitation of transformer, wherein, by inductance L 1With capacitor C 2The half period T/2 of the resonant circuit of forming is much smaller than the switch periods T of switching tube Q 0
Its course of work is as follows: if capacitor C when last switch periods finishes 2On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q, Q 1During conducting simultaneously, capacitor C 2On electric charge through switching tube Q, diode D 2, inductance L 1Discharge resonance is because of diode D 2Unilateral conduction, capacitor C 2With inductance L 1Resonance ad infinitum, and the half period of can only vibrating, capacitor C 2Final voltage be+U i(the B point is for just, and the F point is for negative) is because of switching tube Q, Q 1In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q, Q 1For zero current is opened.As switching tube Q, Q 1When turn-offing simultaneously (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q, Q flow through before the shutoff 1Electric current be made as I m, through diode D 3, give capacitor C 2Charging is again because of capacitance terminal voltage can not suddenly change, so switching tube Q, Q 1For no-voltage is turn-offed.As switching tube Q, Q 1When turn-offing fully, capacitor C 2On voltage be-U i, this is because because clamp diode D 4, D 5Existence, if  L 0I m 2＞ C 2U i 2, then unnecessary energy is through diode D 4, D 5Play back to capacitor C 1, prepare for next switch periods simultaneously.In addition, because diode D 2There is minimum junction capacitance, its meeting and inductance L 1Produce slight extremely high frequency vibration, so should take to use diode D 1The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (2～2.5) %.
Embodiment 2: with reference to the accompanying drawings 2, and diode D 1With diode D 2Be connected in series diode D in the same way 1Negative terminal with the input power supply anode link to each other diode D 2Anode with the input power supply negative terminal join, at described diode D 1With diode D 2Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the negative potential end during the primary coil excitation of transformer join, anode with switch element Q joins again, the negative electrode of switch element Q joins with the input power supply negative terminal, the anode of magnetic reset coil (during the primary coil excitation) is connected to the negative terminal of input power supply, the negative terminal of magnetic reset coil (during the primary coil excitation) forward serial connection diode D 4, be connected to the anode of importing power supply afterwards again, diode D 3Negative pole be connected to the anode of input power supply, the positive potential end when being connected to the primary coil excitation of transformer afterwards again, wherein, by inductance L 1With capacitor C 2The half period T/2 of the resonant circuit of forming is much smaller than the switch periods T of switching tube Q 0
Its course of work is as follows: if capacitor C when last switch periods finishes 2On voltage be-U i(the B point is for negative, F point for just), when switching tube Q conducting, capacitor C 2On electric charge through switching tube Q, diode D 2, inductance L 1Discharge resonance is because of diode D 2Unilateral conduction, capacitor C 2With inductance L 1Resonance ad infinitum, and the half period of can only vibrating, capacitor C 2Final voltage be+U i(the B point is for just, and the F point is for negative), because of the moment that switching tube Q has just opened, electric current is zero or near zero, so switching tube Q is the zero current unlatching.When switching tube Q turn-offs (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, the electric current of the switching tube Q that flows through before the shutoff is made as I m, through diode D 3, give capacitor C 2Charging again because of capacitance terminal voltage can not suddenly change, is turn-offed so switching tube Q is a no-voltage.When switching tube Q turn-offs fully, capacitor C 2On voltage be-U i, this is because because clamp diode D 5Existence, if  L 0I m 2＞ C 2U i 2, then unnecessary energy is through diode D 5Play back to capacitor C 1, prepare for next switch periods simultaneously.In addition, because diode D 2There is minimum junction capacitance, its meeting and inductance L 1Produce slight extremely high frequency vibration, so should take to use diode D 1The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (2～2.5) %.
Embodiment 3: with reference to the accompanying drawings 3, and diode D 1With diode D 2Be connected in series diode D in the same way 1Negative terminal with the input power supply anode link to each other diode D 2Anode with the input power supply negative terminal join, at described diode D 1With diode D 2Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the negative potential end during the primary coil excitation of transformer join, the anode with switch element Q joins again, the negative electrode of switch element Q joins diode D with the input power supply negative terminal 3The positive potential end of negative pole when being connected to the primary coil excitation of transformer, diode D 3Negative pole again with another switch element Q 1Negative electrode join and this switch element Q 1Anode with the input power supply anode link to each other, wherein, by inductance L 1With capacitor C 2The half period T/2 of the resonant circuit of forming is much smaller than the switch periods T of switching tube Q 0
Its course of work is as follows: if capacitor C when last switch periods finishes 2On voltage be-U i(the B point is for negative, F point for just) is as switching tube Q, Q 1During conducting simultaneously, capacitor C 2On electric charge through switching tube Q, diode D 2, inductance L 1Discharge resonance is because of diode D 2Unilateral conduction, capacitor C 2With inductance L 1Resonance ad infinitum, and the half period of can only vibrating, capacitor C 2Final voltage be+U i(the B point is for just, and the F point is for negative) is because of switching tube Q, Q 1In the moment of just having opened, electric current is zero or approaching zero, so switching tube Q, Q 1For zero current is opened.As switching tube Q, Q 1When turn-offing simultaneously (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, switching tube Q, Q flow through before the shutoff 1Electric current be made as I m, through diode D 3, give capacitor C 2Charging is again because of capacitance terminal voltage can not suddenly change, so switching tube Q, Q 1For no-voltage is turn-offed.As switching tube Q, Q 1When turn-offing fully, capacitor C 2On voltage be-U i, if  L 0I m 2＞ C 2U i 2, then unnecessary energy plays back to capacitor C 1, prepare for next switch periods simultaneously.In addition, because diode D 2There is minimum junction capacitance, its meeting and inductance L 1Produce slight extremely high frequency vibration, so should take to use diode D 1The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (2～2.5) %.
Embodiment 4: with reference to the accompanying drawings 4, and diode D 1With diode D 2Be connected in series diode D in the same way 1Negative terminal with the input power supply anode link to each other diode D 2Anode with the input power supply negative terminal join, at described diode D 1With diode D 2Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the negative potential end during the primary coil excitation of transformer join, the anode with switch element Q joins again, the negative electrode of switch element Q joins diode D with the input power supply negative terminal 3Negative pole be connected to the anode of input power supply, the positive potential end when being connected to the primary coil excitation of transformer again, wherein, by inductance L 1With capacitor C 2The half period T/2 of the resonant circuit of forming is much smaller than the switch periods T of switching tube Q 0
Its course of work is as follows: if capacitor C when last switch periods finishes 2On voltage be-U i(the B point is for negative, F point for just), when switching tube Q conducting, capacitor C 2On electric charge through switching tube Q, diode D 2, inductance L 1Discharge resonance is because of diode D 2Unilateral conduction, capacitor C 2With inductance L 1Resonance ad infinitum, and the half period of can only vibrating, capacitor C 2Final voltage be+U i(the B point is for just, and the F point is for negative), because of the moment that switching tube Q has just opened, electric current is zero or near zero, so switching tube Q is the zero current unlatching.When switching tube Q turn-offs (at this moment, the B point voltage is identical with the E point voltage), because the existence of transformer leakage inductance, establishing leakage inductance is L 0, the electric current of the switching tube Q that flows through before the shutoff is made as I m, through diode D 3, give capacitor C 2Charging again because of capacitance terminal voltage can not suddenly change, is turn-offed so switching tube Q is a no-voltage.When switching tube Q turn-offs fully, capacitor C 2On voltage be-U i, if  L 0I m 2＞ C 2U i 2, then unnecessary energy is through playing back to capacitor C 1, prepare for next switch periods simultaneously.In addition, because diode D 2There is minimum junction capacitance, its meeting and inductance L 1Produce slight extremely high frequency vibration, so should take to use diode D 1The measure of amplitude limit.Record through actual tests, increased this H type network in general efficient and improved (2～2.5) %.

Claims (9)

1. a lossless absorption circuit that is used for positive and negative exciting converter is arranged in positive activation type or the inverse excitation type converter, it is characterized in that described lossless absorption circuit is the H type network that is made of electric capacity, inductance and diode, wherein the diode D that is connected in series in the same way 1With diode D 2Anode with the input power supply negative terminal join, its negative terminal with the input power supply anode link to each other; At described diode D 2With diode D 1Between be connected to inductance L 1An end, inductance L 1The other end be connected to diode D 3Positive pole and capacitor C 2An end, capacitor C 2The other end and the anode of switch element Q join; And diode D 3The positive potential end of negative pole when being connected to the primary coil excitation of transformer.
2. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 1 is characterized in that described diode D 3Negative pole and another switch element Q 1Negative electrode join and this switch element Q 1Anode with the input power supply anode link to each other.
3. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 1 is characterized in that described diode D 1Negative terminal and diode D 3Negative terminal be connected to the input power supply anode.
4. according to claim 1 or the 2 or 3 described lossless absorption circuit that are used for positive and negative exciting converter, go back forward between the positive potential end when it is characterized in that the negative electrode of described switch element Q and primary coil excitation and be serially connected with diode D 5
5. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 1 and 2, negative potential end and another switch element Q when it is characterized in that described primary coil excitation 1Anode between also oppositely be serially connected with diode D 4
6. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 4, negative potential end and another switch element Q when it is characterized in that described primary coil excitation 1Anode between also oppositely be serially connected with diode D 4
7. according to claim 1 or the 2 or 3 described lossless absorption circuit that are used for positive and negative exciting converter, it is characterized in that described inductance L 1With capacitor C 2Resonance half period T/2 much smaller than the switch half period T of switching tube Q 0
8. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 4 is characterized in that described inductance L 1With capacitor C 2Resonance half period T/2 much smaller than the switch half period T of switching tube Q 0
9. the lossless absorption circuit that is used for positive and negative exciting converter according to claim 5 is characterized in that described inductance L 1With capacitor C 2Resonance half period T/2 much smaller than the switch half period T of switching tube Q 0
CN 02261508 2002-11-08 2002-11-08 Lossless absorption circuit used for normal/reverse excitation transducer Expired - Fee Related CN2580675Y (en)

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Application Number Priority Date Filing Date Title
CN 02261508 CN2580675Y (en) 2002-11-08 2002-11-08 Lossless absorption circuit used for normal/reverse excitation transducer

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Application Number Priority Date Filing Date Title
CN 02261508 CN2580675Y (en) 2002-11-08 2002-11-08 Lossless absorption circuit used for normal/reverse excitation transducer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005057766A1 (en) * 2003-12-08 2005-06-23 Fuyong Lin A dc power supply with.high power factor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005057766A1 (en) * 2003-12-08 2005-06-23 Fuyong Lin A dc power supply with.high power factor
CN100392968C (en) * 2003-12-08 2008-06-04 林福泳 A high power factor DC power supply

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