CN1499541A - Reset circuit for resetting magnetic field inside iron core of transformer - Google Patents
Reset circuit for resetting magnetic field inside iron core of transformer Download PDFInfo
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- CN1499541A CN1499541A CNA021498660A CN02149866A CN1499541A CN 1499541 A CN1499541 A CN 1499541A CN A021498660 A CNA021498660 A CN A021498660A CN 02149866 A CN02149866 A CN 02149866A CN 1499541 A CN1499541 A CN 1499541A
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Abstract
In circuit theory, the internal magnetic field is treated as an exciting inductance inside transformer. The invented circuit includes a first capacitor, an auxiliary switch, a rectifier and a second capacitor. The resetting steps are: turning on main switch, and turning off the auxiliary switch instantly to release energy of the exciting inductance; storing exciting energy to the exciting inductance of transformer from input power source, and charging the first capacitor through auxiliary winding of transformer; turning on the auxiliary switch and turning off the main switch instantly, transferring energy in exciting inductance and the first capacitor through auxiliary winding to second capacitor; after releasing energy in the exciting inductance completely, the second capacitor charges the first capacitor and the exciting inductance in inverted direction making magnetic field of the exciting inductance be reversed.
Description
Technical field
The invention provides a kind of circuit in order to the transformer core internal magnetic field of resetting, wherein this transformer is used in the power inverter, especially refer to that a kind of excitatory energy efficient that is stored in a transformer fe interior portion of power inverter can the transfer but do not make its dissipation, and can prolong reset circuit and the method for the switch work period (switch duty cycle) of power inverter.
Background technology
Three kinds of technology that being used for now resets is stored in the excitatory energy of transformer fe interior portion mainly comprise tertiary winding formula degausser, RCD type reset circuit and resonant reset circuit, it is in order to the main transformer of clamp and replacement power inverter suitably, to eliminate the full problem of closing of potential transformer core.Please refer to Fig. 1 and Fig. 2, Fig. 1 is the schematic diagram of known tertiary winding formula degausser, and Fig. 2 is the oscillogram of the voltage and the electric current of circuit unit in Fig. 1 circuit.This tertiary winding formula degausser comprises the tertiary winding that a diode 17 is series at a transformer T, and transformer T comprises a magnetizing inductance 14 and one first switch, 12, the first switches 12 and is used for the work period (duty cycle) that control transformer T transmits energy.In Fig. 2, the signal voltage of square wave 12 representative controls first switch 12, V
S1Representative is at the voltage at first switch, 12 two ends, I
MElectric current for the magnetizing inductance 14 that flows through transformer T.When 12 conductings of first switch, 14 chargings end up to first switch 12 transformer T to magnetizing inductance, be series at diode 17 conductings of the tertiary winding of transformer T this moment, magnetizing inductance 14 discharges after excitatory energy is eliminated fully by this loop, magnetizing inductance 14 is the conducting electric current no longer, up to next first switch 12 conducting once more, as the I of Fig. 2
MShown in the oscillogram.If the first side winding of transformer and the turn ratio of the tertiary winding are 1: 1, then the process required time of this charge and discharge equates, just at next first switch 12 once more before the conducting, excitatory energy in the magnetizing inductance 14 must be eliminated fully, so the maximum conducting work period of transformer T is 0.5.The conducting work period of supposing first switch 12 among Fig. 2 is D, D=1/3, then I
MBetween 12 off periods of first switch, only need the time of half just excitatory energy can be eliminated fully, after excitatory energy was eliminated fully, the pressure drop at the first side winding two ends of transformer T was zero, so V
S1Magnitude of voltage also from 2V
INReduce to V
INFrom the above, the shortcoming of this tertiary winding formula degausser maximum is to be limited the switch work period of the first switch T, and its maximum is 0.5.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the schematic diagram of known RCD formula reset circuit, Fig. 4 is the oscillogram of the voltage and the electric current of circuit unit in Fig. 3 circuit, and is more succinct in order to make explanation, in the key diagram if there is identical assembly then to use identical symbolic representation.After this RCD formula reset circuit comprised a resistance 19 electric capacity 18 in parallel, series diode 17 again, are parallel on the first side winding of transformer T at last again.When 12 conductings of first switch, 14 chargings end up to first switch 12 transformer T to magnetizing inductance, diode 17 conductings of RCD formula reset circuit at this moment, magnetizing inductance 14 is by the internal magnetic field of this RCD formula reset circuit replacement transformer, up to next first switch 12 conducting once more.Because parallel resistance 19 is a power consumption assembly, when this RCD formula reset circuit was being eliminated excitatory energy, resistance 19 also will consume the excitatory energy of part became heat energy.From the above, the shortcoming of this RCD formula reset circuit maximum is when being to reset the internal magnetic field of transformer, resistance 19 can consume the excitatory energy of part becomes heat energy, and the energy that is consumed can't be replied, and the consumption of this energy will reduce the operating efficiency of transformer T.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the schematic diagram of known resonant mode reset circuit, and Fig. 6 is the oscillogram of the voltage and the electric current of circuit unit in Fig. 5 circuit.This resonant mode degausser is parallel on the first side winding of transformer T after comprising electric capacity 18 series resistances 19 again.When 12 conductings of first switch, 14 chargings end up to first switch 12 transformer T to magnetizing inductance, the loop discharge that exciting curent forms via magnetizing inductance 14, resistance 19 and electric capacity 18, this loop can be considered an inductance capacitance (LC) resonant tank, by the reset magnetic field of transformer inside of inductance capacitance resonant tank, can improve the operating efficiency of transformer T, but because the harmonic wave that is produced during resonance, make switch 12 two ends of winning a unforeseen high voltage to occur, as the V of Fig. 6
S1Shown in.From the above, the harmonic wave that the shortcoming of this resonant mode degausser maximum is produced when being resonance will make the switch 12 of winning may bear a great voltage, so transformer T need select for use a high withstand voltage switch as first switch 12.
Summary of the invention
Because the problem that run into of above-mentioned known transformer reset circuit, so so main purpose of the present invention a kind of circuit of the transformer internal magnetic field in order to the replacement power inverter is provided, to address the above problem.
A first aspect of the present invention provide in order to when a main switch of a power inverter by the time, a reset internal magnetic field of a transformer, this reset circuit comprises one first electric capacity, be series at a winding of this transformer, one rectifier, the circuit of connecting that is parallel to that this first electric capacity and this winding of this transformer form, one second electric capacity, one auxiliary switch, be series at this second electric capacity and be parallel to this rectifier to form a series connection circuit, an and ON-OFF control circuit, it is set with this main switch of conducting and immediately by this auxiliary switch, so that the excitatory energy energy in the magnetizing inductance is discharged in advance, then more excitatory store energy is charged in this magnetizing inductance and to this first electric capacity, and after a period of time, this auxiliary switch of conducting also ends this main switch immediately, be sent to this second electric capacity with the energy that will be stored in the excitatory energy in this magnetizing inductance and be stored in this first electric capacity, and after the stored excitatory energy release of this magnetizing inductance finishes, by this second electric capacity to this magnetizing inductance and the first electric capacity reverse charging, make the magnetic direction in the magnetizing inductance opposite, realize the purpose that the transformer core internal magnetic field is reset.
Of the present invention one a kind of power inverter than wide mode, it comprises a main switch, one transformer, at least have a first side winding and a secondary side winding, this first side winding is series at this main switch, it receives an input direct voltage and responds to an alternating voltage on this secondary side winding and this auxiliary winding according to a state of this main switch, one ON-OFF control circuit, an and reset circuit, internal magnetic field in order to this transformer of resetting, wherein this transformer comprises a magnetizing inductance, and this ON-OFF control circuit output pulse signal is with this main switch of conducting and immediately by this reset circuit, with with excitatory store energy in magnetizing inductance, and after a period of time, the output pulse signal is sent to this reset circuit with this reset circuit of conducting and by this main switch with the excitatory energy that will be stored in this magnetizing inductance.
Description of drawings:
Fig. 1 is the schematic diagram of known tertiary winding formula degausser.
Fig. 2 is the oscillogram of the voltage and the electric current of circuit unit in Fig. 1 circuit.
Fig. 3 is the schematic diagram of known RCD formula reset circuit.
Fig. 4 is the oscillogram of the electric current and the voltage of circuit unit in Fig. 3 circuit.
Fig. 5 is the schematic diagram of known resonant mode reset circuit.
Fig. 6 is the oscillogram of the voltage and the electric current of circuit unit in Fig. 5 circuit.
Fig. 7 is the schematic diagram that comprises a power inverter of reset circuit of the present invention.
Fig. 8 is the voltage of circuit unit in the reset circuit of Fig. 7 and the oscillogram of electric current.
The reference numeral explanation:
10 power inverters, 12 main switches
14 magnetizing inductances, 16 ON-OFF control circuit
17 diodes, 18 electric capacity
19 resistance, 20 degaussers
22 first electric capacity, 24 rectifiers
26 auxiliary switches, 28 second electric capacity
30 output circuits, 32 first switches
34 second switches, 36 inductance
38 electric capacity
Embodiment
The present invention proposes a kind of transformer reset circuit that is used for power inverter.Please refer to Fig. 7, Fig. 7 is connected in the schematic diagram of auxiliary winding of a transformer T of a power inverter 10 for transformer reset circuit 20 of the present invention.The transformer T of power inverter 10 has a magnetizing inductance 14 as shown in the figure, and comprises a first side winding, secondary side winding and an auxiliary winding, and it is used for receiving an input direct voltage V
IN, and the state of foundation one main switch 12, respond to an alternating voltage V
SECOn secondary side winding.Power inverter 10 also comprises a main switch 12, and it is used for the work period (duty cycle) that control transformer transmits energy.Transformer reset circuit 20 is parallel on the auxiliary winding of transformer T after comprising diode 24 of one first electric capacity, 22 series connection, with behind an auxiliary switch 26 series connection one second electric capacity 28, is parallel on rectifier such as the diode 24 again.Other has an ON-OFF control circuit 16, and it is set with the output pulse signal with the conducting of control main switch 12 and auxiliary switch 26 and end.Main switch 12 and auxiliary switch 26 are the switch of a complementation, and just when main switch 12 conductings, 26 of auxiliary switches end, when main switch 12 ends, and 26 conductings of auxiliary switch.In addition, the power inverter 10 of Fig. 7 also comprises an output circuit 30, is series at the secondary side winding of transformer T, it comprises one first switch 32 and a second switch 34, and an output filter, it is made up of inductance 36 and an electric capacity 38, in order to an output voltage V to be provided
OGive a load (not shown).
In 12 conduction periods of main switch, the magnetizing inductance 14 of transformer T recharges via main switch 12 discharge earlier, the auxiliary switch 26 of transformer reset circuit 20 ends, diode 24 then conductings, make the electric capacity 22 of winning via diode 24 chargings, then first switch, 32 conductings of output circuit 30, second switch 34 ends, inductance 36 ends up to main switch 12 via 32 chargings of first switch.In main switch between 12 off periods, auxiliary switch 26 conductings of reset circuit 20, diode 24 ends, and 28 discharges of 22 pairs second electric capacity of first electric capacity make that the voltage at second electric capacity, 28 two ends is a stable accessory power supply V
AUX, the turn ratio of cooperation transformer T first side winding and secondary side winding, the boost voltage V that this is stable
AUXCan be used as the voltage source of run switch control circuit 16.At the same time, magnetizing inductance 14 forms a loop through first electric capacity 22, auxiliary switch 26 and second electric capacity 28 so that to 28 chargings of second electric capacity by the auxiliary winding of transformer T, after excitatory energy in magnetizing inductance 14 has discharged, then second electric capacity 28 with identical loop to first electric capacity 22 and magnetizing inductance 14 reverse chargings, up to main switch 12 conductings.And output circuit 30 is at main switch between 12 off periods, and first switch 32 ends, second switch 34 conductings, and 38 discharges of 36 pairs of electric capacity of inductance are to keep output voltage V
OStable.
Above-mentioned transformer reset circuit 20 can form metastable auxiliary voltage source V at the two ends of second electric capacity 28
AUX, illustrate as follows.The input voltage of supposing transformer T is V
IN, the work period is D, the number of turn of the first side winding of transformer T is N
1, the number of turn of secondary side winding is N
2, the number of turn of secondary side winding is N
3, the voltage at second electric capacity, 28 two ends is V
C2, then:
V
C2＝V
IN(N
3/N
1)
V
AUX＝V
IN[D/(1-D)](N
3/N
1)+V
C2
Suppose V
IN=36V-72V, N
1: N
2: N
3=7: 1: 1, D=0.64-0.32 (ignoring the pressure drop at diode 24 two ends), the above-listed formula of substitution gets:
| ????V IN | ????36V | ????72V | ????46.2V |
| ????D | ????0.64 | ????0.32 | ????0.5 |
| ????V C2 | ????5.1V | ????10.3V | ????6.6V |
| ????V AUX | ????14.2V | ????15.1V | ????13.2V |
Boost voltage V
AUXVariation delta V
AUX, MAX/ V
AUX, MIN=14.4%, compared to input voltage V
INVariation delta V
IN, MAX/ V
IN, MIN=100% stablized many.
Please refer to Fig. 8, Fig. 8 is the oscillogram of voltage and electric current in Fig. 7 circuit.12 signal voltages for control main switch 12,26 signal voltages, V for control auxiliary switch 26
S1Be the voltage at first switch, 12 two ends, V
PBe the voltage at the first side winding two ends of transformer T, V
SECBe the voltage at the secondary side winding two ends of transformer T, I
MElectric current for the magnetizing inductance 14 that flows through transformer T.As shown in the figure, 12 and 26 is the signal voltage of one group of complementation, controls the conducting of main switch 12 and auxiliary switch 26 respectively and ends, and just when main switch 12 conductings, auxiliary switch 26 ends, when main switch 12 by the time, auxiliary switch 26 conductings.Voltage V at main switch 12 two ends
S1Reach voltage V at the first side winding two ends of transformer T
PAnd equal the input voltage V of transformer T
IN, V just
IN=V
P+ V
S1Since voltage volt-equilibrium principle second (volt-second balance) of inductance, V
PVoltage in main switch 12 by the time area that surrounds with time shaft, the area with the time shaft encirclement when needing with main switch 12 conductings equates that the work period of supposing main switch 12 is D, V
PMagnitude of voltage when main switch 12 conductings is V
IN, then when main switch 12 by the time, V
PMagnitude of voltage be-V
IN[D/ (1-D)], and V
S1Magnitude of voltage be V
IN/ (1-D).If D equals 0.5, V
S1Magnitude of voltage be 2V
IN, if D equals 0.6, V
S1Magnitude of voltage be 2.5V
IN, if the withstand voltage of main switch 12 can improve again, work period D just can prolong again.
As I among Fig. 8
MShown in, the I of negative sign
MCurrent value is represented I among sense of current and Fig. 7
MThe direction of arrow opposite, flow through the electric current I of magnetizing inductance 14
MWhen main switch 12 conductings with Fig. 7 in the arrow rightabout be discharged to input power supply V by magnetizing inductance 14
INIn magnetizing inductance 14, after the noenergy, follow electric current I
MAlong the direction of arrow among Fig. 7 by input power supply V
IN14 chargings end up to main switch 12 to magnetizing inductance.After main switch 12 ends, electric current I
MJust the direction of arrow is discharged to second electric capacity 28 in magnetizing inductance 14 after the noenergy via the auxiliary winding of transformer through first electric capacity 22 in Fig. 7, then second electric capacity 28 with identical loop to first electric capacity 22 and magnetizing inductance 14 reverse chargings up to main switch 12 conducting once more, wherein electric current I
MOpposite with the direction of arrow among Fig. 7.By said process as can be known, electric current I
MOnly in energy storage components such as electric capacity, inductance, do to unroll, so excitatory energy is not consumed.
Shown in the oscillogram of the voltage of Fig. 8 and electric current, V
SECThe alternating voltage that induces in secondary side winding by first side winding for transformer T, since the effect of reset circuit 20, V
SECBe a square wave, utilize this square wave to control the conducting of first switch 32 and second switch 34 and end, can reach the effect of synchronous rectification.Work as V
SECWhen exporting a positive voltage, the 32 necessary conductings of first switch, second switch 34 must end, and works as V
SECWhen exporting a negative voltage, first switch 32 must end, and second switch 34 must conducting.So the control end of first switch 32 is connected to the positive voltage terminal of transformer T secondary side winding, makes the switch 32 of winning at V
SECOutput conducting during positive voltage ends during negative voltage, and the control end of second switch 34 is connected to the negative voltage side of transformer T secondary side winding, makes second switch 34 at V
SECOutput ends during positive voltage, conducting during negative voltage, and first switch 32 like this and second switch 34 are formed naturally the switch of a complementation and reach the effect of synchronous rectification.
Though above-mentioned preferred embodiment only illustrates the auxiliary winding that transformer reset circuit 20 is connected in transformer T, but also transformer reset circuit 20 can be connected in first side winding or the secondary side winding of transformer T, all can reach the effect of replacement transformer core internal magnetic field of the present invention.
Compare with known technology, the present invention utilizes two electric capacity, one rectifier stack such as diode and a switch module are formed the reset circuit of a transformer, this reset circuit can be connected on arbitrary winding of this transformer, and can reach the advantage that replacement transformer core internal magnetic field and excitatory energy do not lose, so can improve circuit efficiency.And the degaussing voltage of this transformer is stable, and first switch can select the lower switch module of withstand voltage to finish, and its switch work period also can prolong.Because the effect of this reset circuit, the secondary side winding of this transformer is output as a square wave, and then the synchronous rectification switch of output circuit can be adopted direct driving, so that simplified driving circuit and raising circuit efficiency.And then this reset circuit can produce a metastable auxiliary voltage source, can provide ON-OFF control circuit 16 to use.
The above only is preferred embodiment of the present invention, and all equivalences according to claim scope of the present invention change and improve, and all should belong to covering scope of the present invention.
Claims (20)
1. reset circuit, in order to when a main switch of a power inverter by the time, an internal magnetic field of the transformer of resetting, this reset circuit comprises:
One first electric capacity is series at a winding of this transformer;
One rectifier, the circuit of connecting that is parallel to that this first electric capacity and this winding of this transformer form;
One second electric capacity;
One auxiliary switch is series at this second electric capacity, is parallel to this rectifier to form a series connection circuit;
And
One ON-OFF control circuit, it is set with this main switch of conducting and immediately by this auxiliary switch, to discharge the excitatory energy in this magnetizing inductance, then excitatory store energy is charged in this magnetizing inductance and to this first electric capacity, and after a period of time, this auxiliary switch of conducting also ends this main switch immediately, be sent to this second electric capacity with the energy that will be stored in the excitatory energy in this magnetizing inductance and be stored in this first electric capacity, and after the stored energy release of this magnetizing inductance finishes, this magnetizing inductance and first electric capacity are charged by this second electric capacity.
2. reset circuit as claimed in claim 1, wherein this rectifier is a diode.
3. reset circuit as claimed in claim 1, wherein this ON-OFF control circuit is set at and avoids this main switch and the conducting simultaneously of this auxiliary switch.
4. reset circuit as claimed in claim 1, wherein this transformer comprises a first side winding and a secondary side winding at least, and wherein this main switch is series at the first side winding of this transformer.
5. reset circuit as claimed in claim 4, wherein this transformer also comprises an auxiliary winding, and wherein this reset circuit is parallel to first side winding, secondary side winding or the auxiliary winding of this transformer.
6. reset circuit as claimed in claim 1, wherein this reset circuit is set so that a stable accessory power supply to be provided, and it is applicable to this ON-OFF control circuit of operation.
7. reset circuit, in order to when a main switch of a power inverter by the time, an internal magnetic field of the transformer of resetting, this reset circuit comprises:
One first electric capacity is series at a winding of this transformer;
One rectifier, the circuit of connecting that is parallel to that this first electric capacity and this winding of this transformer form;
One second electric capacity;
One auxiliary switch is series at this second electric capacity, is parallel to this rectifier to form a series connection circuit; And
One ON-OFF control circuit is used for controlling the conducting of this main switch and this auxiliary switch and ending, and it is set to avoid the conducting simultaneously of this main switch and this auxiliary switch;
Wherein this ON-OFF control circuit is set to control this main switch conducting and to end this auxiliary switch immediately, with with excitatory store energy in this magnetizing inductance, and after a period of time, this auxiliary switch of conducting also ends this main switch immediately, be sent to this second electric capacity with the excitatory energy that will be stored in this magnetizing inductance, and after the stored energy release of this magnetizing inductance finishes, this magnetizing inductance and first electric capacity are charged by this second electric capacity.
8. reset circuit as claimed in claim 7, wherein this rectifier is a diode.
9. reset circuit as claimed in claim 7, wherein this transformer comprises a first side winding and a secondary side winding at least, and wherein this main switch is series at the first side winding of this transformer.
10. reset circuit as claimed in claim 9, wherein this transformer also comprises an auxiliary winding, and wherein this reset circuit is parallel to first side winding, secondary side winding or the auxiliary winding of this transformer.
11. reset circuit as claimed in claim 7, wherein with excitatory store energy before this magnetizing inductance, the excitatory energy that originally was stored in this magnetizing inductance is released.
12. reset circuit as claimed in claim 7, wherein when excitatory store energy is in this magnetizing inductance, this first electric capacity is recharged with storage power in wherein, and when the excitatory energy in being stored in this magnetizing inductance was sent to this second electric capacity, the energy that is stored in this first electric capacity was discharged to this second electric capacity.
13. reset circuit as claimed in claim 7, wherein this reset circuit is set so that a stable accessory power supply to be provided, and it is applicable to this ON-OFF control circuit of operation.
14. a power inverter, it comprises:
One main switch;
One transformer has a first side winding and a secondary side winding at least, and this first side winding is series at this main switch, and it receives an input direct voltage and responds to an alternating voltage on this secondary side winding according to a state of this main switch;
One ON-OFF control circuit; And
One reset circuit is in order to the internal magnetic field of this transformer of resetting;
Wherein this transformer comprises a magnetizing inductance, and this ON-OFF control circuit output pulse signal is to control this main switch conducting and to end this reset circuit immediately, with with excitatory store energy in this magnetizing inductance, and after a period of time, the output pulse signal is sent to this reset circuit with this reset circuit of conducting and immediately by this main switch with the excitatory energy that will be stored in this magnetizing inductance.
15. power inverter as claimed in claim 14, wherein this reset circuit comprises:
One first electric capacity is series at a winding of this transformer;
One rectifier, the circuit of connecting that is parallel to that this first electric capacity and this winding of this transformer form;
One second electric capacity; And
One auxiliary switch is series at this second electric capacity, is parallel to this rectifier to form a series connection circuit.
16. power inverter as claimed in claim 14, wherein this ON-OFF control circuit is set to avoid the conducting simultaneously of this main switch and this auxiliary switch.
17. power inverter as claimed in claim 14, wherein this transformer also comprises an auxiliary winding, and wherein this reset circuit is parallel to first side winding, secondary side winding or the auxiliary winding of this transformer.
18. power inverter as claimed in claim 14 also comprises an output circuit, is series at the secondary side winding of this transformer, it comprises one first switch and a second switch, and an output filter, in order to an output dc voltage to be provided.
19. power inverter as claimed in claim 18, wherein this output filter comprises an inductance and an electric capacity.
20. power inverter as claimed in claim 18, the alternating voltage of wherein responding on this secondary side winding of this transformer is a square-wave signal, and control the conduction and cut-off of this first switch and this second switch by this, so that this alternating voltage is carried out synchronous rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02149866 CN1276443C (en) | 2002-11-07 | 2002-11-07 | Reset circuit for resetting magnetic field inside iron core of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02149866 CN1276443C (en) | 2002-11-07 | 2002-11-07 | Reset circuit for resetting magnetic field inside iron core of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499541A true CN1499541A (en) | 2004-05-26 |
| CN1276443C CN1276443C (en) | 2006-09-20 |
Family
ID=34233809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02149866 Expired - Fee Related CN1276443C (en) | 2002-11-07 | 2002-11-07 | Reset circuit for resetting magnetic field inside iron core of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1276443C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108089139A (en) * | 2018-01-30 | 2018-05-29 | 江苏多维科技有限公司 | A kind of bipolar switch sensor reset |
-
2002
- 2002-11-07 CN CN 02149866 patent/CN1276443C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108089139A (en) * | 2018-01-30 | 2018-05-29 | 江苏多维科技有限公司 | A kind of bipolar switch sensor reset |
| CN108089139B (en) * | 2018-01-30 | 2024-02-27 | 江苏多维科技有限公司 | Double-pole switch sensor capable of resetting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1276443C (en) | 2006-09-20 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Guolian Electronics (Shanghai) Co., Ltd. Assignor: Hon Hai Precision Industry Co., Ltd. Contract fulfillment period: 2008.1.1 to 2022.11.7 contract change Contract record no.: 2009990000262 Denomination of invention: Reset circuit for resetting magnetic field inside iron core of transformer Granted publication date: 20060920 License type: Exclusive license Record date: 2009.4.2 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.1.1 TO 2022.11.7; CHANGE OF CONTRACT Name of requester: GUO LIAN ELECTRONICS (SHANGHAI) CO., LTD. Effective date: 20090402 |
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Granted publication date: 20060920 Termination date: 20131107 |