CN1188941C - Device and method for detecting circuit exception of power supply converter and protecting it - Google Patents
Device and method for detecting circuit exception of power supply converter and protecting it Download PDFInfo
- Publication number
- CN1188941C CN1188941C CNB011013788A CN01101378A CN1188941C CN 1188941 C CN1188941 C CN 1188941C CN B011013788 A CNB011013788 A CN B011013788A CN 01101378 A CN01101378 A CN 01101378A CN 1188941 C CN1188941 C CN 1188941C
- Authority
- CN
- China
- Prior art keywords
- voltage
- switch element
- control
- type power
- exchange type
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The present invention provides an exchange type power supply converter and a method. The converter comprises a transformer, a switch element, a rectifying circuit, a positive feedback circuit, a control circuit and a voltage regulation control circuit, wherein the transformer comprises a primary winding, a secondary winding and a feedback winding; the switch element comprises a master control terminal; when the switch element is on state, the positive feedback circuit provides a positive feedback voltage to the master control terminal; the control circuit comprises a first control element and a delay circuit. At a preset time after the switch element is on state, the feedback winding obtains a first voltage, and a stabilized voltage control circuit provides a second voltage when a direct current voltage reaches a preset value. Both of the first and the second voltages switch on the first control element and turn off the switch element.
Description
Technical field
The present invention is relevant for a kind of exchange type power transducer, and particularly, the present invention changes (ringing choke converter, RCC) Tong exchange type power transducer about a kind of use exciting chokes.
Background technology
Generally speaking, some small household appliances, for example video tape recorder (video tape recorder, VTR) or facsimile machine etc. needs stable and little direct current (DC) power supply of power.And use the exchange type power transducer of RCC system to have relative simple structure and high efficiency characteristic, therefore widely as the supply unit of general small household appliances, convert the required DC power supply of circuit in the small household appliances in order to AC power supplies with family expenses.
The RCC system, or say the RCC structure, in many patents, described.For example, United States Patent (USP) the 6th, 081, No. 433, the 6th, 101, No. 103 and the 6th, 072, in No. 702.
Fig. 1 is the rough schematic of a traditional RCC.AC represents external AC power.Behind a diode bridge rectifier DB and filter capacitor C1, produced a high-tension DC power supply, as the main power source of whole RCC structure.
The RCC structure contains a transformer T, a switch element FET Q1, a starting resistance RS, regenerative circuit 40, a control circuit 46 and an output rectifier 42.Transformer T has three windings at least, be respectively elementary winding N1, with the secondary winding N2 of N1 reversed polarity and with the feedback winding Nb of N1 same polarity.Switch element FET Q1 is connected in series mutually with 2 ends of elementary winding N1.Starting resistance RS is connected between the grid of 1 end of elementary winding N1 and switch element FET Q1.Regenerative circuit 40 includes the resistance R 4 and capacitor C 3 of a serial connection, is connected between the grid of 3 ends of feedback winding Nb and switch element FET Q1.Control circuit 46 is connected to 3 ends of feedback winding Nb and the grid of switch element FET Q1.Output rectifier 42 includes a series diode CR 51 and a capacitor C 51 in parallel.The anode of diode CR 51 is connected in 5 ends of secondary winding N2.
When high voltage brings out now in 1 of elementary winding N1, the little electric current of the RS that flows through can be gradually to the gate charges of FET Q1.After the voltage difference of the source electrode of the grid of FET Q1 and FET Q1 arrives the threshold voltage vt of a FETQ1, just conducting of FET Q1, and cause beginning to have electric current to flow between 1 end of elementary winding N1 and 2 ends.Electric current variation between 1 end and 2 ends can make 4 ends of feedback winding Nb and the generation induced voltage between 3 ends.This induced voltage can improve the voltage of the grid of FET Q1 by the coupling of regenerative circuit 40, has more strengthened the current value of 1 end to 2 ends.So the positive feedback meeting constantly improves the current value of 1 end to 2 ends, makes elementary winding N1 store enough current energies.
Just, the described RCC structure of leading portion only can be vibrated and can not be guaranteed that the voltage difference between Vo and the GND keeps a definite value.If secondary winding N2 is constantly to C51 charging, then the voltage difference between Vo and the GND may be too high and damaged the circuit of follow-up Vo of being connected to and GND.
Therefore, the RCC structure often includes a testing circuit 48, such as shown in the LED P D and voltage stabilizing didoe ZD among Fig. 1, is connected to the two ends of capacitor C 51.When the voltage difference on the capacitor C 51 is too high when reaching the puncture voltage of voltage stabilizing didoe ZD, LED P D can be luminous, phototransistor PT in the control circuit 46 receives the light of LED P D and conducting, thereby reduces the time that to capacitor C 5 chargings reach transistor Q3 conducting.So, can avoid elementary winding to store excessive current energy.So that the voltage between Vo and the GND maintains certain level.
Yet if the undertension of AC, when just the voltage of the main power source of RCC structure was on the low side, the induced voltage that is produced at 3 ends that feed back winding Nb also can reduce.So, control circuit 46 can't obtain enough voltage and make the Q3 conducting, and FET Q1 can't be turn-offed.The conducting that has caused FET Q1 to continue, and make potential difference between Vo and the GND too high and damaged the circuit of follow-up Vo of being connected to and GND.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of and can prevents the AC undertension and cause the exchange type power transducer of the RCC system of the out of control problem of Vo voltage.
Another object of the present invention is to avoid when output loading is excessive, can reduce unnecessary power output.
A further object of the present invention is effectively to avoid the problem of output over-voltage.
A further object of the present invention when being not have output loading, can effectively reduce the power consumption of exchange type power transducer self, to meet environmental protection requirement.
According to above-mentioned purpose, the present invention proposes a kind of exchange type power transducer, includes a transformer, a switch element, a rectification circuit, a regenerative circuit, a control circuit and a controlling circuit of voltage regulation.This transformer includes an elementary winding, level winding and a feedback winding at least.This switch element is in series with this elementary winding, includes a master control end.This rectification circuit is connected in this secondary winding, in order to export a direct current voltage.This regenerative circuit is connected between first end and this master control end of this feedback winding, when this switch element conducting, in order to this master control end one positive feedback voltage to be provided.This control circuit is provided in to include first control element and an extension circuit between this feedback winding and this master control end.This first control element is connected between this control end and first earth point, has first control end.This delay circuit is connected between this first end and this first control end, after a scheduled time after this switch element conducting, obtains first voltage by this feedback winding, with this first control element of conducting, turn-offs this switch element with this.This controlling circuit of voltage regulation is connected between second end and this first control end of this feedback winding, when this direct voltage reaches a predetermined value, provides second voltage, with this first control element of conducting, turn-offs this switch element with this.
The present invention proposes a kind of method of control one exchange type power transducer in addition, and this exchange type power transducer includes a transformer, a switch element and a rectification circuit.This method includes the following step: (1) provides this master control end one positive feedback voltage from first end of this feedback winding when this switch element conducting; (2) scheduled time after this switch element conducting, provide first voltage to first control element, turn-off this switch element with this from this first end; And (3) when this direct voltage reaches a predetermined value, provides second voltage to this first control element from second end of this feedback winding, turn-offs this cut-off device with this.
The invention has the advantages that protection, the protection of output over-voltage and the protection of overload that the input low-voltage can effectively be provided.And the present invention can make whole RCC structure, when not having load, effectively reduces the power of autophage.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the circuit diagram of a traditional RCC;
Fig. 2 is according to the present invention, uses the RCC system and with the circuit diagram of FET as the exchange type power transducer of switch element; And
Fig. 3 is according to the present invention, uses the RCC system and with the circuit diagram of bipolar junction-type transistor as the exchange type power transducer of switch element.
Symbol description:
10 exchange type power transducers 12 become AC in the rectifier of DC
13,40 regenerative circuits, 14 transformers
16,42 output rectifiers, 17 start-up circuits
18,48 testing circuits, 20,46 control circuits
22 circuit overcurrent protections, 24 controlling circuit of voltage regulation
Embodiment
See also Fig. 2, Fig. 2 is the circuit diagram of the exchange type power transducer of use RCC system of the present invention.
Exchange type power transducer 10 of the present invention includes one AC is become rectifier 12, a start-up circuit 17, a transformer 14, an output rectifier 16, a switching transistor FET Q1, a regenerative circuit 13, a circuit overcurrent protection 22, a control circuit 20 and the testing circuit 18 of DC.
The rectifier 12 that AC is become DC has comprised a bridge rectifier BD1 and a filter capacitor C1, in order to the operation DC power supply of whole RCC structure to be provided.
Transformer 14 has three windings at least, be respectively elementary winding N1, with the secondary winding N2 of N1 reversed polarity and with the feedback winding Nb of N1 same polarity.As shown in Figure 2, the two ends of elementary winding N1 are called 1 end and 2 ends, and the two ends of feedback winding Nb are called 3 ends and 4 ends, and the two ends of secondary winding N2 are called 5 ends and 6 ends.
Start-up circuit 17 includes the resistance R 1 and the R2 of serial connection, is connected between the grid of 1 end switch element FET Q1 of elementary winding N1 the required electric current of origination action when power turn-on to be provided.Switching transistor FET Q1 is connected in series mutually with 2 ends of elementary winding N1, flows in order to the electric current of controlling elementary winding N1.Circuit overcurrent protection 22 includes resistance R 12, R10 and capacitor C 6, in order to the flow through size of current of switching transistor FET Q1 of detection.Regenerative circuit 13 includes the resistance R 4 and capacitor C 3 of a serial connection, is connected between the grid of 3 ends of feedback winding Nb and switching transistor FET Q1.
Controlling circuit of voltage regulation 24 has comprised diode D1, resistance R 14, capacitor C 4 and a phototransistor PT.Resistance R 14 and capacitor C 4 in parallel being connected between 4 ends and first earth point that feed back winding Nb, diode D1 is connected to 3 ends of first earth point and feedback winding Nb, and phototransistor PT is connected between the base stage of 4 ends of feedback winding Nb and bipolar junction-type transistor Q3.
The operating process of whole exchange type power transducer 10 has below been described.
When AC power supplies did not connect as yet, FET Q1 was an off state.When AC power supplies just connected, a small starting current will pass through resistance R 1 and R22, to the gate charges of FET Q1.In case behind the threshold voltage of voltage difference greater than FET Q1 of the grid of FET Q1 to source electrode, FET Q1 just can conducting, makes electric current flow to 2 ends by 1 end of elementary winding N1.
After FET Q1 conducting, the electric current that 1 end flows to 2 ends begins to increase, and feedback winding Nb has produced the electric current of 4 ends to 3 ends because of magnetoelectric induction.The induced voltage that 3 end places produce is by the coupling effect of resistance R 4 with capacitor C 3, the grid voltage of FET Q1 can raise, and then has more increased the electric current that 1 end flows to 2 ends.So, produced the phenomenon of a positive feedback, lasting lifting 1 end flows to the electric current of 2 ends.
Turn-off the mode of FET Q1, have two kinds at least.First kind of mode is through RC delay circuit 26.The voltage at 3 end places increases, and through the RC time of delay that a resistance R 6 and C5 are caused, the base voltage of bipolar junction-type transistor Q3 also can increase.In case the base stage of bipolar junction-type transistor Q3 reaches the conducting voltage of bipolar junction-type transistor Q3 to the voltage difference of emitter-base bandgap grading (collector), just conducting of bipolar junction-type transistor Q3, grid (gate) voltage of FET Q1 is connect down to being almost 0, and then turn-offed FET Q1.The second way is via circuit overcurrent protection 22.Voltage on the resistance R 12 in the circuit overcurrent protection 22 is proportional to the current value that 1 end flows to 2 ends; when the voltage on the resistance R 12 during up to certain level; by the coupling of resistance R 10 with capacitor C 6; the base stage of bipolar junction-type transistor Q3 (base) voltage also can be increased to the level of conducting bipolar junction-type transistor Q3, and then has turn-offed FET Q1.
When FET Q1 turn-offed, current value moment that 1 end flows to 2 ends became 0.Therefore, the current energy that originally is stored in elementary winding N1 just is transformed into secondary winding N2 and feedback winding Nb.Secondary winding N2 has produced the electric current of 6 ends toward 5 ends, by diode CR 51, to capacitor C 51 chargings, improves the voltage of the anode of capacitor C 51.Feedback winding Nb has produced the charging current of 3 ends toward 4 ends, to capacitor C 4 chargings, has reduced the magnitude of voltage at 3 end places simultaneously.
After secondary winding N2 current energy has been put, the voltage at the 3 end places of feedback winding Nb can by the negative value counter-rotating become on the occasion of.When the electric current of past 4 ends of 3 ends has changed direction along with vibration,, just begin to promote the grid voltage of FET Q1 by the coupling of capacitor C 3 and resistance R 4.After in case the voltage difference between the source electrode of the grid of FET Q1 and FET Q1 exceeds threshold voltage (Vt), just conducting of FET Q1, initial winding N1 begins to have electric current to flow.The conducting of FET Q1 has also begun previous described positive feedback phenomenon, the electric current of lasting increase by 1 end to 2 end simultaneously.
By above analysis as can be known, the circulation of carrying out conducting and shutoff that FET Q1 can continue makes energy be transferred to secondary winding N2.So can be used as the supply unit of a direct current.
After the circulation through several times conducting and shutoff, because the combination of diode D1, capacitor C 4 and resistance R 14,4 ends of feedback winding Nb can form a voltage that is higher than first earth point.
The present invention has a principal character, is 4 ends that utilize feedback winding Nb, produces a voltage source, as the power supply of phototransistor PT and testing circuit 28.
Exchange type power transducer 10 of the present invention has following several advantages:
1. the protection when good input low-voltage is provided: when the AC low-voltage of input; because the also relative reduction of 3 terminal voltages of feedback winding Nb; so resistance R 6 is with capacitor C 5 and can't provide an enough voltage to come conducting bipolar junction-type transistor Q3, and then turn-offs FET Q1.The conducting of FET Q1 and the circulation of shutoff still can produce via circuit overcurrent protection 22, and the magnitude of voltage of drawing high the Vo place that continues.Because 5 ends of secondary winding N2 are same polarity with 4 ends of feedback winding N2, so the voltage of 4 ends of feedback winding Nb can approximately be proportional to the voltage source that 5 ends of secondary winding N2 can become the base stage of bipolar junction-type transistor Q3.Add the effect of LED P D and phototransistor PT, bipolar junction-type transistor Q3 meeting conducting, and turn-offed FET Q1, make the unlikely rising of magnitude of voltage at Vo place.
2. the protection when good output over-voltage is provided: in case when testing circuit lost efficacy because of certain factor; cause LED P D and phototransistor PT ineffective; by the 1st analysis as can be known; the magnitude of voltage at Vo place can be drawn high; the voltage of 4 ends of feedback winding Nb is also drawn high simultaneously; when the magnitude of voltage of 4 ends of feedback winding Nb is higher than a predetermined level; by the puncture of voltage stabilizing didoe ZD4 and the conducting of bipolar junction-type diode Q4; the base stage of bipolar junction-type diode Q3 can receive a voltage by the tie point of resistance R 1 and resistance R 22 and conducting bipolar junction-type diode Q3; and then turn-offed FET Q1, also thereby interrupted the conducting of FET Q1 and the circulation of shutoff.The voltage that the magnitude of voltage of always waiting until Vo is reduced to 4 ends of certain level and feedback winding Nb has passed through resistance R 14 or the electric leakage of other leakage path is low to certain level, bipolar junction-type transistor Q3 just can turn-off, and the conducting of FET Q1 and the circulation of shutoff just can begin once again.
3. provide the protection of good overload: when the overload of output; when just having connected a very low equivalent resistance load between Vo and the GND; voltage on the resistance R 12 in the circuit overcurrent protection 22 is proportional to the current value that 1 end flows to 2 ends; when the voltage on the resistance R 12 during up to certain level; by the coupling of resistance R 10 with capacitor C 6; the base stage of bipolar junction-type transistor Q3 (base) voltage also can be increased to the level of conducting bipolar junction-type transistor Q3, and then has turn-offed FET Q1.Because the magnitude of voltage of 4 ends of feedback winding Nb does not descend immediately because of the reduction of output voltage V o.And still provide a reverse current by voltage stabilizing didoe ZD4, under the effect of bipolar junction-type transistor Q4, bipolar junction-type transistor Q4 has shunted the electric current through resistance R 1 again.Therefore, the relative reduction of gate charges electric current of FET Q1 is so the ON time of FET Q1 is delayed relatively.The voltage of always waiting until 4 ends of feedback winding Nb has passed through resistance R 14 or the electric leakage of other leakage path, and low bipolar junction-type transistor Q4 just can turn-off to certain level, and FET Q1 could be again because of the conducting once again of enough starting currents.Because the prolongation of FET Q1 ON time makes the energy consumption of supply unit also reduce greatly.
4. the energy consumption of the own supply unit of saving when non-loaded: when not having load between the Vo of output place and the GND, the leakage current at the 4 end places of feedback winding Nb can determine the ON time of FET Q1.The ON time of another decision FET Q1 is the size of charging current of the grid of 17 couples of FET Q1 of start-up circuit.Analysis as the 3rd advantage is described, and bipolar junction-type transistor Q4 has shunted the electric current that has passed through resistance R 1.Therefore, the relative reduction of gate charges electric current of FET Q1 is so the ON time of FET Q1 is delayed relatively.That is to say that when not having load, the conducting of FET Q1 is understood relative delaying with the circulation time started of shutoff, generally speaking, the mean consumption power of whole exchange type power device 10 has just reduced.
FET Q1 in the exchange type power device of RCC system of the present invention also can replace with a high-power bipolar junction-type transistor, as shown in Figure 3.For bipolar junction-type transistor Q1 is provided the enough bias currents when the positive feedback, therefore, must add a diode D4 in the regenerative circuit 13, connected mode is as shown in Figure 3.
Compared to the exchange type power transducer of known utilization RCC system, exchange type power transducer of the present invention has formed a voltage source at 4 ends of feedback winding Nb, as the power supply of phototransistor PT and testing circuit 28.So, can solve input low-voltage, output over-voltage and the issuable problem of overload simultaneously, simultaneously, exchange type power transducer of the present invention when not having load, the also loss of the power of reduction voluntarily own.
Though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion with accompanying Claim institute restricted portion.
Claims (16)
1. exchange type power transducer includes:
One transformer includes an elementary winding, level winding and a feedback winding;
One switch element is in series with this elementary winding, includes a master control end;
One rectification circuit is connected in this secondary winding, in order to export a direct current voltage;
One regenerative circuit is connected between first end and this master control end of this feedback winding, when this switch element conducting, in order to this master control end one positive feedback voltage to be provided;
One control circuit is provided in to include between this feedback winding and this master control end:
First control element is connected between this control end and first earth point, has first control end;
One delay circuit is connected between this first end and this first control end, after a scheduled time after this switch element conducting, obtains first voltage by this feedback winding, with this first control element of conducting, turn-offs this switch element with this; And
One controlling circuit of voltage regulation is connected between second end and this first control end of this feedback winding, when this direct voltage reaches first scheduled voltage, provides second voltage, with this first control element of conducting, turn-offs this switch element with this.
2. exchange type power transducer as claimed in claim 1, wherein, this controlling circuit of voltage regulation includes a parallel resistor and electric capacity, is connected between this second end and this first earth point, and a diode, with so that this first earth point forward be connected to this first end.
3. exchange type power transducer as claimed in claim 1, wherein, this controlling circuit of voltage regulation includes:
One checkout gear is connected in this rectification circuit, in order to detect this direct voltage, when this direct voltage reaches this first scheduled voltage, sends a coupled signal; And
One Coupling Control Unit is when receiving this coupled signal, in order to be connected in this second end and this first control end.
4. exchange type power transducer as claimed in claim 3, wherein, this checkout gear is connected between this rectification circuit and second earth point, includes a current-limiting resistance of series connection, the light-emitting diode and a reverse voltage stabilizing didoe of a forward; Wherein, this Coupling Control Unit includes a phototransistor, sends out the light that produces in order to receive this light-emitting diode, so that this second end is connected with this first control end.
5. exchange type power transducer as claimed in claim 1, wherein, this exchange type power transducer includes a checkout gear in addition, be connected between this second end and this first control end, when the magnitude of voltage of this second end is higher than the second predetermined magnitude of voltage, this first control end tertiary voltage is provided,, turn-offs this switch element with this with this first control element of conducting.
6. exchange type power transducer as claimed in claim 5, wherein, this exchange type power transducer includes a starting drive in addition, is connected between this master control end of this elementary winding and this switch element, in order to the threshold voltage of this switch element when the power initiation to be provided.
7. exchange type power transducer as claimed in claim 6, wherein, this starting drive includes first resistance and second resistance of two series connection.
8. exchange type power transducer as claimed in claim 7, wherein, this tertiary voltage is supplied by the tie point between this first resistance and this second resistance.
9. exchange type power transducer as claimed in claim 8, wherein, this checkout gear includes second control element, be connected between this tie point and this first control end, have second control end, and a Zener diode, be connected between this second end and this second control end.
10. exchange type power transducer as claimed in claim 1; wherein; this exchange type power transducer includes an overcurrent protective device in addition; when this switch element has a drive current to reach a predetermined current value; provide the 4th voltage to this first control end; with this control element of conducting, turn-off this switch element with this.
11. exchange type power transducer as claimed in claim 10, wherein, this overcurrent protective device includes a resistance, is connected between this switch element and this first earth point.
12. the method for control one an exchange type power transducer, this exchange type power transducer includes:
One transformer includes an elementary winding, level winding and a feedback winding;
One switch element is in series with this elementary winding, includes a master control end; And
One rectification circuit is connected in this secondary winding, in order to export a direct current voltage;
This method includes the following step:
When this switch element conducting, provide this master control end one positive feedback voltage from first end of this feedback winding;
A scheduled time after this switch element conducting provides first voltage to first control element from this first end, turn-offs this switch element with this; And
When this direct voltage reaches first scheduled voltage, provide second voltage to this first control element from second end of this feedback winding, turn-off this switch element with this.
13. control method as claimed in claim 12, wherein, this control method includes a following step in addition, when this second end has a magnitude of voltage to reach second scheduled voltage, this first control end tertiary voltage is provided,, turn-offs this switch element with this with this first control element of conducting.
14. control method as claimed in claim 12, wherein, this control method includes a following step in addition, when a main power source begins to supply this exchange type power transducer, provide a threshold voltage to this master control end via a starting drive, with this switch element of conducting.
15. control method as claimed in claim 14, wherein, this starting drive is a bleeder circuit, includes a dividing point, and this tertiary voltage is produced by this dividing point.
16. control method as claimed in claim 12, wherein, this control method includes a step in addition, when this switch element has a drive current to reach a predetermined current value, provide the 4th voltage to this first control end, this first control element of conducting turn-offs this switch element with this.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011013788A CN1188941C (en) | 2001-01-16 | 2001-01-16 | Device and method for detecting circuit exception of power supply converter and protecting it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011013788A CN1188941C (en) | 2001-01-16 | 2001-01-16 | Device and method for detecting circuit exception of power supply converter and protecting it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1366370A CN1366370A (en) | 2002-08-28 |
| CN1188941C true CN1188941C (en) | 2005-02-09 |
Family
ID=4652037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011013788A Expired - Lifetime CN1188941C (en) | 2001-01-16 | 2001-01-16 | Device and method for detecting circuit exception of power supply converter and protecting it |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188941C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277057B (en) * | 2007-03-30 | 2011-12-07 | 泰商泰达电子公司 | Overload protection delay circuit for switching power supply |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20040517A1 (en) * | 2004-03-18 | 2004-06-18 | St Microelectronics Srl | METHOD AND RELATED CIRCUIT FOR THE PROTECTION AGAINST THE MALFUNCTIONS OF THE FEEDBACK RING IN SWITCHING POWER SUPPLIES |
| US7576528B2 (en) * | 2006-10-04 | 2009-08-18 | Power Integrations, Inc. | Control circuit responsive to an impedance |
| JP5457927B2 (en) * | 2010-04-23 | 2014-04-02 | セミコンダクター・コンポーネンツ・インダストリーズ・リミテッド・ライアビリティ・カンパニー | Light emitting element control circuit |
| CN105191090B (en) * | 2013-03-20 | 2017-09-19 | 三菱电机株式会社 | Signal transfering circuit and the power-converting device for possessing the circuit |
| CN107294393A (en) * | 2017-05-23 | 2017-10-24 | 楚雄医药高等专科学校 | A kind of low cost and high reliability Yi nationality medicine production isolation type switch power |
-
2001
- 2001-01-16 CN CNB011013788A patent/CN1188941C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277057B (en) * | 2007-03-30 | 2011-12-07 | 泰商泰达电子公司 | Overload protection delay circuit for switching power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1366370A (en) | 2002-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9960684B2 (en) | Electronic converter, and related lighting system and method of operating an electronic converter | |
| US6947297B2 (en) | Active resonant snubber for DC-DC converter | |
| US7233507B2 (en) | Non dissipative snubber circuit with saturable reactor | |
| CN1076139C (en) | Single ended forward Dc-to-DC converter providing enhanced resetting for synchronous rectification | |
| CN1085435C (en) | Switching regulator | |
| CN1200503C (en) | Switch supply unit | |
| US5307005A (en) | Zero current switching reverse recovery circuit | |
| US20020101742A1 (en) | Switching power supply device having series capacitance | |
| KR20020074206A (en) | Voltage clamping system and method for a dc/dc power converter | |
| US6952354B1 (en) | Single stage PFC power converter | |
| US7362598B2 (en) | Synchronous rectifier gate drive shutdown circuit | |
| CN1193485C (en) | Switch power supply equipment | |
| WO2005074113A1 (en) | Switching power supply | |
| CN1276574C (en) | Current driven synchronous rectifier with energy recovery using hysteresis driver | |
| US5457379A (en) | High efficiency switch mode regulator | |
| CN88102486A (en) | Current source power converting apparatus with overvoltage protection | |
| US7450404B2 (en) | Switching power supply and ZVS method thereof | |
| US6519164B1 (en) | Single power stage AC/DC forward converter with power switch voltage clamping function | |
| CN1188941C (en) | Device and method for detecting circuit exception of power supply converter and protecting it | |
| US20030151927A1 (en) | Synchronous rectifier self gate drive for zero voltage switching power conversion circuits | |
| CN1274077C (en) | Synchronous rectification circuit for flyback converter | |
| CN1144345C (en) | Counter exciting synchronous rectification DC/DC converter protector | |
| CN209692616U (en) | A kind of auxiliary winding power supply circuit | |
| KR102142630B1 (en) | Driving circuit of voltage driven synchronous rectifier | |
| CN1499338A (en) | Computer power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Taida Electronic and Power Source (Dongguang) Co., Ltd. Assignor: Delta Optoelectronics Inc. Contract fulfillment period: 2005.1.1 to 2011.3.31 Contract record no.: 2009990000774 Denomination of invention: Device and method for detecting circuit exception of power supply converter and protecting it Granted publication date: 20050209 License type: Exclusive license Record date: 20090722 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2005.1.1 TO 2011.3.31; CHANGE OF CONTRACT Name of requester: TAIDA ELECTRONICS POWER SUPPLY( DONGGUAN ) CO., LT Effective date: 20090722 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20050209 |