CN104638946A - Dual-winding transformer primary-side detection output voltage AC-DC converter - Google Patents
Dual-winding transformer primary-side detection output voltage AC-DC converter Download PDFInfo
- Publication number
- CN104638946A CN104638946A CN201510072464.8A CN201510072464A CN104638946A CN 104638946 A CN104638946 A CN 104638946A CN 201510072464 A CN201510072464 A CN 201510072464A CN 104638946 A CN104638946 A CN 104638946A
- Authority
- CN
- China
- Prior art keywords
- circuit
- transformer
- voltage sample
- winding transformer
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention provides a dual-winding transformer primary-side detection output voltage AC-DC converter. The converter comprises a primary-side rectifying filter circuit, a control circuit/drive circuit, a switch tube, a current sampling circuit, a voltage sampling circuit, an absorption circuit, a transformer and an auxiliary-side rectifying filter circuit; the transformer is a dual-winding transformer, the switch tube is respectively connected with the control circuit/drive circuit, the primary-side rectifying filter circuit and the current sampling circuit, the current sampling circuit is also connected with one end of the control circuit/drive circuit and the primary side of the dual-winding transformer, the voltage sampling circuit is connected with the primary side of the dual-winding transformer and the current sampling circuit, and the sampling end of the voltage sampling circuit is connected with the control circuit/drive circuit. According to the technical scheme, the dual-winding transformer primary-side detection output voltage AC-DC converter has advantages of fewer elements and low cost.
Description
Technical field
The invention belongs to electronic circuit field, particularly relate to a kind of two winding transformer former limit detecting output voltage AC-DC converter.
Background technology
Along with people are to the reduction of environmental protection, energy-conservation, efficient requirement and cost, AC-DC (AC-DC) converter is advanced by leaps and bounds recent years, achieves the development of great-leap-forward.As described in Figure 1, (PSR) AC-DC converter and application circuit thereof are fed back in the former limit of one that prior art provides.Described former limit feedback AC-DC converter comprises control chip 400, rectifying and wave-filtering 401, loop compensation electric capacity 405, absorption circuit 406, switching tube 407, primary current sampling resistor 408, auxiliary limit rectifier diode 409, power supply electric capacity 410, and voltage sampling 411, transformer 413, output rectifying and wave-filtering 414.Transformer comprises former limit winding Np, auxiliary winding Na and vice-side winding Ns tri-windings, wherein the auxiliary winding of transformer is used for chip power supply, indirect detecting time limit Tons discharge time and time limit output voltage Vout, for use in Systematical control and output voltage control.
In the scheme realizing prior art, find that prior art exists following technical problem:
The transformer provided due to prior art needs three windings, complex manufacturing technology, and peripheral components is many, and cost is higher.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of two winding transformer former limit detecting output voltage AC-DC converter, is intended to solve existing technical scheme complex process, problem that cost is high.
On the one hand, there is provided a kind of two winding transformer former limit detecting output voltage AC-DC converter, described transducer comprises: former limit current rectifying and wave filtering circuit, control circuit/drive circuit, switching tube, current sampling circuit, voltage sample circuit, transformer and secondary current rectifying and wave filtering circuit; Described transformer is two winding transformer, switching tube is connected with control circuit/drive circuit, former limit current rectifying and wave filtering circuit and current sampling circuit respectively, current sampling circuit is also connected with one end of control circuit/drive circuit and the former avris of two winding transformer, former avris and the current sampling circuit of voltage sample circuit and two winding transformer are connected, and the sampling end of voltage sample circuit is connected with control circuit/drive circuit.
Optionally, described voltage sample circuit is specially: two resistance be connected in series, and wherein the tie point of two resistance is the sampling end of voltage sample circuit 111.
Optionally, described transducer also comprises: absorption circuit, and described absorption circuit is connected with the former avris of transformer.
Optionally, described transducer specifically comprises: the collector electrode (or drain electrode) of the two ends difference connecting valve pipe of former limit current rectifying and wave filtering circuit and ground connection, the base stage (or grid) of switching tube connects the gate pin of chip, the emitter (or source electrode) of switching tube connects the cs pin of chip and one end of current sampling circuit, and the other end of current sampling circuit connects one end of two winding transformer NP; The other end ground connection of NP; One end of voltage sample circuit is connected with one end of NP, the other end ground connection of voltage sample circuit, the fb pin of the sampling chip termination of voltage sample circuit, and the GND pin of chip connects one end of NP.
Optionally, described transducer also comprises: absorption circuit, and described absorption circuit comprises: the resistance be connected in parallel and electric capacity, and the resistance be connected in parallel is connected with one end of NP with one end of electric capacity, the resistance be connected in parallel is connected with the negative electrode of diode with the other end of electric capacity, the plus earth of diode.
In embodiments of the present invention, technical scheme provided by the invention provides a kind of two winding transformer former limit detecting output voltage AC-DC converter, and this structure adopts double-winding structure to carry out the detection of voltage, relative to three winding, its structure is simple, and technique is simple, peripheral components is few, so cost is lower.
Accompanying drawing explanation
A kind of AC-DC converter circuit theory diagrams that Fig. 1 provides for prior art;
Fig. 2 is the structure chart of the present invention's two winding transformer former limit detecting output voltage AC-DC converter;
Fig. 3 is the circuit theory diagrams of two winding transformer of the present invention former limit detecting output voltage AC-DC converter;
Fig. 4 is the oscillogram of node provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The specific embodiment of the invention provides a kind of two winding transformer former limit detecting output voltage AC-DC converter, this transducer as shown in Figure 2, comprise: former limit current rectifying and wave filtering circuit 101, control circuit/drive circuit 100, switching tube 107, current sampling circuit 108, voltage sample circuit 111, absorption circuit, transformer 113 and secondary current rectifying and wave filtering circuit 114; Wherein, this transformer 113 is two winding transformer, switching tube 107 is connected with control circuit/drive circuit, former limit current rectifying and wave filtering circuit 101 and current sampling circuit 108 respectively, current sampling circuit is also connected with one end of control circuit/drive circuit and the former avris of two winding transformer, former avris and the current sampling circuit of voltage sample circuit 111 and two winding transformer are connected, and the sampling end of voltage sample circuit 111 is connected with control circuit/drive circuit.
Optionally, above-mentioned voltage sample circuit 111 as shown in Figure 3, is specifically as follows: two resistance be connected in series, and wherein the tie point of two resistance is the sampling end of voltage sample circuit 111.
Invention embodiment does not limit to the concrete realization form of voltage sample circuit.Only need to carry out voltage sampling.
Optionally, above-mentioned transducer also comprises: absorption circuit, and this absorption circuit is connected with the former avris of transformer.
Above-mentioned transducer as shown in Figure 3, specifically comprise: the collector electrode (or drain electrode) of the two ends difference connecting valve pipe 107 of former limit current rectifying and wave filtering circuit 101 and ground connection, the base stage of switching tube 107 connects the gate(drive singal of chip 100) pin, the emitter (or source electrode) of switching tube 107 connects the cs(chip selection signal of chip 100) one end of pin and current sampling circuit 108, the other end of current sampling circuit 108 connects one end of two winding transformer 113 NP; The other end ground connection of NP; One end of voltage sample circuit 111 is connected with one end of NP, the other end ground connection of voltage sample circuit 111, the fb(of the sampling chip termination 100 of voltage sample circuit 111 feedback) pin, the GND(ground connection of chip 100) pin connects one end of NP.
Optionally, the absorption circuit of above-mentioned transducer comprises: the resistance be connected in parallel and electric capacity, the resistance be connected in parallel is connected with one end of NP with one end of electric capacity, and the resistance be connected in parallel is connected with the negative electrode of diode with the other end of electric capacity, the plus earth of diode.
The double winding that the present invention proposes former limit feedback AC-DC converter and application circuit thereof.When after the starting resistor reaching chip 100, export driving pulse high level by gate pin and make switching tube 107 conducting, the voltage of 101 filter capacitors is by switching tube 107, current sampling resistor 108, the composition loop, former limit of transformer 113, just lower negative on transformer 113 original edge voltage, in coil, electric current linearly increases, just upper negative under secondary coil voltage, commutating circuit 114 diode ends, and does not have electric current to flow through.After transformer 113 primary current reaches chip 100 certain controlling value inner (its value can by producer or user's sets itself), gtae pin becomes low level, and switching tube 107 ends.Because magnetic flux can not suddenly change, transformer 113 secondary induces just lower negative voltage, makes commutating circuit 114 diode current flow, to capacitor charging, and powering load.Meanwhile, the leakage inductance energy on the former limit of transformer 113 is released by absorption circuit 106.After the leakage inductance energy on the former limit of transformer 113 is absorbed, the voltage at two ends and the relation of secondary coil are:
Vp=Vs* (Np/Ns) (Vp is original edge voltage, and Vs is secondary voltage, and Np is the former limit number of turn, and Ns is the secondary number of turn)
And Vs=Vout+Vf (Vf is the forward conduction voltage drop of secondary commutating circuit 114 diode, and Vout is output voltage after rectification)
So Vp=(Vout+Vf) * (Np/Ns)
If the dividing potential drop coefficient of voltage sampling circuit 111 is k, then at this moment, the voltage of the fb pin of chip 100 is:
Vfb=(Vout+Vf)*((Np/Ns)/k)
After distortion:
Vout=Vfb*k*Ns/Np-Vf
Because Vf can condition determine (it is determined by the intrinsic parameter of diode) by experiment, and Np/Ns is determined by transformer technique, and k is determined by voltage sample circuit 111 parameter, so just indirectly detect output voltage Vout by detecting Vfb.Fig. 4 is the waveform schematic diagram of the node of transducer provided by the invention, and wherein, in Fig. 4, the reference voltage of each node is all for reference with the voltage of the GND pin of chip 100.
Make by utilizing above-mentioned technology in system, directly to utilize the former limit of two winding transformer just to sample to output voltage, thus the auxiliary winding saving transformer and the circuit connected thereof, simplify transformer manufacturing technological process, decrease peripheral components, reduce cost.
The foregoing is only better embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a two winding transformer former limit detecting output voltage AC-DC converter, described transducer comprises: former limit current rectifying and wave filtering circuit, control circuit/drive circuit, switching tube, current sampling circuit, voltage sample circuit, absorption circuit, transformer and secondary current rectifying and wave filtering circuit; It is characterized in that,
Described transformer is two winding transformer, switching tube is connected with control circuit/drive circuit, former limit current rectifying and wave filtering circuit and current sampling circuit respectively, current sampling circuit is also connected with one end of control circuit/drive circuit and the former avris of two winding transformer, former avris and the current sampling circuit of voltage sample circuit and two winding transformer are connected, and the sampling end of voltage sample circuit is connected with control circuit/drive circuit.
2. transducer according to claim 1, is characterized in that, described voltage sample circuit is specially: two resistance be connected in series, and wherein the tie point of two resistance is the sampling end of voltage sample circuit 111.
3. transducer according to claim 1, is characterized in that, described transducer also comprises: absorption circuit, and described absorption circuit is connected with the former avris of transformer.
4. transducer according to claim 1, it is characterized in that, described transducer specifically comprises: the collector electrode of one end connecting valve pipe of former limit current rectifying and wave filtering circuit or drain electrode, the other end ground connection of former limit current rectifying and wave filtering circuit, the base stage of switching tube or grid connect the gate pin of chip, the emitter of switching tube or source electrode connect the cs pin of chip and one end of current sampling circuit, and the other end of current sampling circuit connects one end of two winding transformer NP; The other end ground connection of NP; One end of voltage sample circuit is connected with one end of NP, the other end ground connection of voltage sample circuit, the fb pin of the sampling chip termination of voltage sample circuit, and the GND pin of chip connects one end of NP.
5. transducer according to claim 4, it is characterized in that, described transducer also comprises: absorption circuit, described absorption circuit comprises: the resistance be connected in parallel and electric capacity, the resistance be connected in parallel is connected with one end of NP with one end of electric capacity, the resistance be connected in parallel is connected with the negative electrode of diode with the other end of electric capacity, the plus earth of diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510072464.8A CN104638946A (en) | 2015-02-11 | 2015-02-11 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510072464.8A CN104638946A (en) | 2015-02-11 | 2015-02-11 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104638946A true CN104638946A (en) | 2015-05-20 |
Family
ID=53217360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510072464.8A Pending CN104638946A (en) | 2015-02-11 | 2015-02-11 | Dual-winding transformer primary-side detection output voltage AC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104638946A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862653A (en) * | 2018-09-14 | 2019-06-07 | 苏州瑞铬优电子科技有限公司 | A kind of illumination driving circuit for High Power Factor LED |
| TWI669586B (en) * | 2018-11-15 | 2019-08-21 | 康舒科技股份有限公司 | Primary side integrated circuit module of power supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201414084Y (en) * | 2009-03-31 | 2010-02-24 | 深圳市安邦信电子有限公司 | Switch power supply based on quasi-resonance |
| CN202663314U (en) * | 2012-07-06 | 2013-01-09 | 聚辰半导体(上海)有限公司 | AC (alternating current)-DC (direct current) switching power supply converter |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN203522531U (en) * | 2013-09-22 | 2014-04-02 | 山东贞明光电科技有限公司 | Switching power supply based on primary side feedback control power switch chip |
| CN204559414U (en) * | 2015-02-11 | 2015-08-12 | 深圳市华芯邦科技有限公司 | Two winding transformer former limit detecting output voltage AC-DC converter |
-
2015
- 2015-02-11 CN CN201510072464.8A patent/CN104638946A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201414084Y (en) * | 2009-03-31 | 2010-02-24 | 深圳市安邦信电子有限公司 | Switch power supply based on quasi-resonance |
| CN202663314U (en) * | 2012-07-06 | 2013-01-09 | 聚辰半导体(上海)有限公司 | AC (alternating current)-DC (direct current) switching power supply converter |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN203522531U (en) * | 2013-09-22 | 2014-04-02 | 山东贞明光电科技有限公司 | Switching power supply based on primary side feedback control power switch chip |
| CN204559414U (en) * | 2015-02-11 | 2015-08-12 | 深圳市华芯邦科技有限公司 | Two winding transformer former limit detecting output voltage AC-DC converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862653A (en) * | 2018-09-14 | 2019-06-07 | 苏州瑞铬优电子科技有限公司 | A kind of illumination driving circuit for High Power Factor LED |
| TWI669586B (en) * | 2018-11-15 | 2019-08-21 | 康舒科技股份有限公司 | Primary side integrated circuit module of power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101552546B (en) | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof | |
| CN105896986B (en) | A kind of controlled resonant converter and its control method | |
| CN202167993U (en) | Phase-shifted full-bridge switching power supply converter with lossless snubber circuit | |
| CN104300795A (en) | Flyback converter and control method of flyback converter | |
| CN101860189A (en) | Bridgeless power factor correcting circuit for critical continuous current mode and method thereof | |
| CN103813591B (en) | The CRM Flyback LED driver of low output current peak-to-average force ratio | |
| CN104779828A (en) | High-efficiency photovoltaic grid connected inverter | |
| EP2937979A1 (en) | Single-pole switch power source | |
| CN203167339U (en) | LED drive circuit without auxiliary winding | |
| CN103944402A (en) | Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter | |
| CN103904901A (en) | Phase-shift full-bridge converter circuit and control method | |
| CN104578844A (en) | Switching mode power supply circuit | |
| CN203243226U (en) | Switch power source | |
| TW201427263A (en) | DC to AC power conversion apparatus and method thereof | |
| CN105322798A (en) | Multipath output flyback converter | |
| CN103052240A (en) | High-power factor light-emitting diode driving circuit structure | |
| CN201830521U (en) | Offline type high-power LED (light-emitting diode) constant-current drive power supply | |
| CN113676057B (en) | LLC synchronous rectification circuit based on secondary current simulation | |
| CN104539177B (en) | Synchronous rectification drive circuit and synchronous rectification method of switching power supply | |
| CN204517684U (en) | A kind of isolated voltage conversion circuit and control circuit | |
| CN203911764U (en) | High light-load efficiency digital power supply suitable for server | |
| CN102170232B (en) | Self-driven active buffer and flyback switching mode power supply | |
| CN104638946A (en) | Dual-winding transformer primary-side detection output voltage AC-DC converter | |
| CN101860219B (en) | DC-DC converter | |
| CN204858973U (en) | Isolation feedback supply circuit of LLC resonant transformation ware |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |