CN110212779B - Magnetic field reset system, method and power supply - Google Patents
Magnetic field reset system, method and power supply Download PDFInfo
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- CN110212779B CN110212779B CN201910514900.0A CN201910514900A CN110212779B CN 110212779 B CN110212779 B CN 110212779B CN 201910514900 A CN201910514900 A CN 201910514900A CN 110212779 B CN110212779 B CN 110212779B
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- 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
- H02M3/337—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 in push-pull configuration
Abstract
The invention provides a magnetic field resetting system, a magnetic field resetting method and a power supply, and relates to the technical field of transformers, wherein the system comprises the following components: reset control means and reset execution means; the reset control device is used for acquiring current information of at least two primary windings of the transformer, determining a target primary winding needing magnetic field reset processing based on the current information, generating a control command and sending the control command to the reset execution device; and the reset execution device is used for carrying out magnetic field reset processing on the target primary winding based on the control command. According to the magnetic field resetting system, the magnetic field resetting method and the power supply, the magnetic field energy of the primary winding is eliminated, the primary energy of the transformer can be balanced, the normal operation of the transformer can be ensured, the working efficiency of the power supply is improved, the stable operation of electronic equipment is ensured, and the use sensitivity of a user can be improved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a magnetic field resetting system, a magnetic field resetting method and a power supply.
Background
Transformers are important components in power supplies. The power supply can be various, such as a push-pull switching power supply and the like. When the switch tube is closed, the power supply energy is transmitted to the primary side of the high-frequency transformer of the push-pull switch power supply, magnetic energy is accumulated to the primary side of the high-frequency transformer until the primary side is saturated along with the accumulation of time, the energy of two magnetic fields of two primary windings is converted mutually, and the phenomenon of magnetic field deviation can occur after a period of time, and the side with larger stored energy in the two primary windings easily causes unbalance of the energy of the magnetic fields, so that the normal work of the next push-pull switch converter is influenced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a magnetic field reset system, a magnetic field reset method, and a power supply, which can determine a target primary winding that needs to be subjected to magnetic field reset processing based on collected current information of the primary winding, and perform magnetic field reset processing on the target primary winding.
According to one aspect of the present invention, there is provided a magnetic field reset system comprising: reset control means and reset execution means; the reset control device is used for acquiring current information of at least two primary windings of the transformer, determining a target primary winding needing magnetic field reset processing based on the current information, generating a control command and sending the control command to the reset execution device; and the reset executing device is used for carrying out magnetic field reset processing on the target primary winding based on the control command.
Optionally, the reset control device includes: the current acquisition unit is connected with the primary winding and is used for acquiring the current information; and the instruction processing unit is used for determining the target primary winding based on the current information, generating the control command and sending the control command to the reset execution device under the condition that all primary windings are disconnected from the input voltage.
Optionally, the number of the primary windings is two; the instruction processing unit includes: and the comparator module is used for determining the larger current of the two currents corresponding to the two primary windings and determining the primary winding corresponding to the larger current as the target primary winding.
Optionally, the instruction processing unit includes: the circuit comprises a latch module, a clock circuit module and an amplifying circuit module; the clock circuit module sends a clock signal to the latch module; the latch module generates a level signal according to the comparison result signal output by the comparator module and sends the level signal to the amplifying circuit module; the amplifying circuit module generates the control command based on the level signal and sends the control command to the reset execution device.
Optionally, the reset performing apparatus includes: a switch control unit and a reset processing unit; the switch control unit is used for controlling the on-off of a connecting circuit between the reset processing unit and the primary winding based on the control command so as to enable the reset processing unit to be communicated with the target primary winding and disconnected with other primary windings; and the reset processing unit is used for carrying out magnetic field reset processing on the target primary winding.
Optionally, the switch control unit includes: and the switching tube is arranged in the connecting line and used for controlling the connection and disconnection of the connecting line based on the control command.
Optionally, the switching tube comprises: NPN type triode, IGBT and NMOS transistor.
Optionally, the reset processing unit includes: and the reset winding is arranged on the primary side of the transformer and used for generating reset energy when being communicated with the target primary side winding so as to offset the energy of the target primary side winding and carry out magnetic field reset treatment.
Optionally, the reset processing unit includes: resetting the resistor; and when the reset resistor is communicated with the target primary winding and the reset winding, the reset resistor is used for carrying out magnetic field reset treatment on the target primary winding.
Optionally, the number of turns of the at least two primary windings is the same; duty cycle of the transformer
Where Np is the number of turns of the primary winding and Nm is the number of turns of the reset winding.
Optionally, the transformer comprises: a push-pull transformer; the push-pull transformer comprises two primary windings with the same number of turns.
According to another aspect of the present invention, there is provided a power supply comprising: a magnetic field reset system as described above.
According to still another aspect of the present invention, there is provided a magnetic field resetting method, including: the method comprises the steps that a reset control device collects current information of at least two primary windings of a transformer, determines a target primary winding needing magnetic field reset processing based on the current information, generates a control command and sends the control command to a reset execution device; and the reset execution device performs magnetic field reset processing on the target primary winding based on the control command.
Optionally, the reset control means comprises: the device comprises a current acquisition unit and an instruction processing unit; the method further comprises the following steps: the current acquisition unit acquires the current information; and the instruction processing unit determines the target primary winding based on the current information under the condition that all primary windings are disconnected from the input voltage, generates the control command and sends the control command to the reset execution device.
Optionally, the number of the primary windings is two, and the instruction processing unit includes: a comparator module; the determining the target primary winding based on the current information includes: the comparator module determines a larger current of the two currents corresponding to the two primary windings, and determines the primary winding corresponding to the larger current as the target primary winding.
Optionally, the instruction processing unit includes: the circuit comprises a latch module, a clock circuit module and an amplifying circuit module; the generating the control command and sending the control command to the reset execution device comprises: the clock circuit module sends a clock signal to the latch module; the latch module generates a level signal according to the comparison result signal output by the comparator module and sends the level signal to the amplifying circuit module; the amplifying circuit module generates the control command based on the level signal and sends the control command to the reset execution device.
Optionally, the reset performing device includes: a switch control unit and a reset processing unit; the magnetic field resetting processing of the target primary winding by the resetting executing device based on the control command comprises the following steps: the switch control unit controls the on-off of a connecting circuit between the reset processing unit and the primary winding based on the control command so as to enable the reset processing unit to be communicated with the target primary winding and disconnected with other primary windings; and the reset processing unit carries out magnetic field reset processing on the target primary winding.
Optionally, the switch control unit comprises: a switching tube, wherein the switching tube is arranged in the connection circuit, and the connection and disconnection of the connection circuit are controlled based on the control command.
Optionally, the reset processing unit includes: and the reset winding generates reset energy when being communicated with the target primary winding, and the reset energy and the energy generated by the target primary winding are mutually offset.
Optionally, the reset processing unit includes: resetting the resistor; and when the reset resistor is communicated with the target primary winding and the reset winding, the reset resistor is used for carrying out magnetic field reset treatment on the target primary winding.
Optionally, the transformer comprises: a push-pull transformer; the push-pull transformer comprises two primary windings with the same number of turns.
The magnetic field reset system, the method and the power supply can determine a target primary winding needing magnetic field reset processing based on the acquired current information of the primary winding of the transformer, and carry out magnetic field reset processing on the target primary winding; the magnetic field energy of the primary winding is eliminated, so that the primary energy of the transformer can be balanced, the normal operation of the transformer can be ensured, the working efficiency of a power supply is improved, and the stable operation of electronic equipment is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of one embodiment of a magnetic field reset system according to the present invention;
FIG. 2 is a block diagram of a reset control device in an embodiment of a magnetic field reset system according to the present invention;
FIG. 3 is a block diagram of an instruction processing unit in one embodiment of a magnetic field reset system according to the present invention;
FIG. 4 is a block diagram of a reset actuator in an embodiment of a magnetic field reset system according to the present invention;
FIG. 5 is a schematic view of another embodiment of a magnetic field reset system according to the present invention;
fig. 6 is a flow chart illustrating an embodiment of a magnetic field resetting method according to the present invention.
Detailed Description
The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solution of the present invention is described in various aspects below with reference to various figures and embodiments.
As shown in fig. 1, the present invention provides a magnetic field resetting system, comprising: a reset control device 10 and a reset execution device 20. The reset control device 10 collects current information of at least two primary windings of the transformer, determines a target primary winding to be subjected to magnetic field reset processing based on the current information, generates a control command, and sends the control command to the reset execution device 20. The reset execution device 20 performs magnetic field reset processing on the target primary winding based on the control command. The control command may be a variety of control signals, etc.
For example, the reset control device 10 may collect current information of at least two primary windings of the transformer, determine that one primary winding needs to be subjected to magnetic field reset processing according to the determination rule and based on the current information, determine the primary winding as a target primary winding, generate a control command, and send the control command to the reset execution device 20. The reset execution device 20 performs a magnetic field reset process on the target primary winding based on the control command.
The primary winding of the transformer is also called the primary winding, and the secondary winding of the transformer is also called the secondary winding. The transformer may be various, such as a push-pull transformer, etc., and the push-pull transformer includes two primary windings with the same number of turns.
As shown in fig. 2, the reset control apparatus 10 includes: a current collection unit 11 and an instruction processing unit 12. The number of the primary windings is two, and the current acquisition unit 11 is connected with the primary windings 01 and 02 and used for acquiring current information. The current collection unit 11 includes a sampling line, a sampling resistor, and the like. The instruction processing unit 12 determines a target primary winding based on the current information in a state where all primary windings are disconnected from the input voltage, generates a control command, and sends the control command to the reset execution device 20.
In one embodiment, as shown in FIG. 3, instruction processing unit 12 includes: a comparator block 121, a latch block 122, a clock circuit block 123, and an amplification circuit block 124. The number of the primary windings is two, the comparator module 121 determines a larger current of the two currents corresponding to the two primary windings, and determines the primary winding corresponding to the larger current as the target primary winding.
The clock circuit block 123 sends a clock signal to the latch block 122. The latch module 122 generates a level signal according to the comparison result signal outputted from the comparator module 121 and transmits the level signal to the amplifying circuit module 124. The amplifying circuit module 124 generates a control command based on the level signal and transmits the control command to the reset performing device 20.
In one embodiment, the reset performing means may be various. As shown in fig. 4, the reset performing means includes: a switch control unit 21 and a reset processing unit 22. The switch control unit 21 controls the on-off of the connection line between the reset processing unit 22 and the primary windings 01 and 02 based on the control command, so that the reset processing unit 22 is communicated with the target primary winding and disconnected with other primary windings; the reset processing unit 22 performs magnetic field reset processing on the target primary winding.
The switch control unit 21 includes a switching tube and the like, and the switching tube is disposed in the connection line and controls on/off of the connection line based on a control command so that the reset processing unit 22 is connected to the target primary winding and disconnected from the other primary windings. The switch tube can be various, such as an NPN type triode, an IGBT, an NMOS transistor, and the like.
In one embodiment, the reset processing unit may be various. For example, the reset processing unit includes: and the reset winding generates reset energy when being communicated with the target primary winding so as to counteract the energy of the target primary winding and carry out magnetic field reset treatment. The reset winding is a primary winding of the transformer. The reset processing unit may further include: and the reset resistor is used for carrying out magnetic field reset treatment on the target primary winding when the reset resistor is communicated with the target primary winding and the reset winding.
The number of turns of the primary winding of the transformer is the same, and the duty ratio of the transformer is the same
Where Np is the number of turns of the primary winding and Nm is the number of turns of the reset winding. Based on the formula (1-1), in the case where the value of D or Nm is determined, the Nm or D value can be obtained.
Fig. 5 is a schematic view of another embodiment of a magnetic field reset system according to the present invention. The push-pull switching power supply is provided with a high-frequency transformer, D2 and D1 are diodes, L1 is an inductor, C1 and C2 are capacitors, and VG1 and VG2 are switching tubes. The number of turns of the primary windings Np and Np 'is the same, two switching tubes VG1 and VG2 in the push-pull circuit are conducted alternately, and alternating-current voltages with opposite phases are formed at two ends of the primary windings Np and Np' respectively. During the period that the switch tube VG1 is turned on, the switch tube VG2 is turned off, the input Uin voltage is stored through the capacitor C1, the end of the primary winding Np' is positive and negative, and the transformer induces an induced voltage which is positive and negative.
When the switching tubes VG1 and VG2 are all turned off, Ip and Id disappear, Ip is the current in the primary winding Np when the switching tube VG1 is turned on, and Id is the current in the primary winding Np' when the switching tube VG2 is turned on. The current of the inductor L1 changes gradually, the diodes D1 and D2 share half of the current (ID1 and ID2), one current enters from a different-name end, the other current enters from a same-name end, the current and the current are the same in the same direction and offset with each other, the ID1 is larger than the ID2 by one exciting current, and the ampere turns must be balanced. When the switch tube VG2 is turned on, the switch tube V1 is turned off, the input Uin voltage is stored through the C1, and the primary winding Np is positive and negative up and down, so that the transformer induces an induced voltage positive and negative up and down.
After the push-pull circuit is operated for a long time, the magnetic field of the primary winding Np 'and the magnetic field of the primary winding Np are continuously cancelled, but imbalance of magnetic field energy of the primary winding Np and the primary magnetic field of the primary winding Np' occurs. In order to make the push-pull circuit work normally, a magnetic field resetting system is provided, and the magnetic field resetting system comprises: reset control means and reset execution means. The reset control device includes: the current acquisition unit, the comparator module 121, the latch module 122, the clock circuit module 123, the amplification circuit module 124 and the like; the reset execution device includes: reset winding Nm, switch tube VG3, switch tube VG4, reset resistor R1, and the like.
The current acquisition unit comprises an acquisition line and a sampling resistor. The comparator module 121 is connected to the primary windings Np and Np' through the acquisition lines, respectively. The current of the primary windings Np and Np' acquired through the acquisition line passes through the sampling resistor, and the comparator module 121 obtains a sampling voltage. The currents of the primary windings Np and Np' collected by the collecting lines are Ia and Ib respectively, the resistance value of the sampling resistor is set to be R2, the sampling voltage U1 is R2 is Ia, and the sampling voltage U2 is R2 is Ib.
The comparator module 121 may determine that the magnetic field of the primary winding Np or the primary winding Np' is stronger by comparing the current value or the sampling voltage value. The clock circuit module 123 sends a clock signal to the latch module 122, and the latch module 122 generates a level signal according to the comparison result signal output by the comparator module 121 and sends the level signal to the amplifying circuit module 124. The latch module 122 and the clock circuit module 123 can output a low level or a high level, i.e. output 0 or 1, and the amplifying circuit module 124 generates a control command to control the on/off of the switch tubes VG3 and VG4 based on the level signal.
When the switching tubes VG1 and VG2 are both opened and the push-pull circuit is in the dead-zone state, if U1 > U2, the amplifying circuit module 124 generates control commands to control the switching tube VG3 to be closed and the switch VG4 to be opened, and the energy of the primary winding Np is reset through the reset winding Nm and the reset resistor R1. When the switch tube VG3 is closed and the switch VG4 is opened, the reset resistor R1, the reset winding Nm and the primary winding Np are communicated, the reset winding Nm is equivalent to a positive power supply after being electrified, the primary winding Np is equivalent to a negative power supply after being electrified, the two energies are mutually offset, and the rest energy is consumed in the reset resistor R1, so that the reset effect is achieved.
When the switching tubes VG1 and VG2 are both opened and the push-pull circuit is in the dead-zone state, if U1< U2, the amplifying circuit module 124 generates a control command to control the switching tube VG4 to be closed, the switching tube VG3 is opened, and the energy of the primary winding Np' is reset through the reset winding Nm and the reset resistor R1. The energy of the reset winding Nm and the maximum energy of the primary winding of the transformer are mutually offset, so that the primary energy of the transformer can be balanced, and the normal and high-efficiency work of a push-pull circuit is ensured.
The relationship between Vo and Vin can be obtained according to the magnetic energy (volt-second product balance) of the inductor VL waveform:
the derivation of equation (1-2) yields:
wherein D is the duty cycle, Vin input voltage, Von output voltage, Ns is the secondary winding (number of turns), and Np is the primary winding (number of turns).
The primary side of the high-frequency transformer has increasingly larger exciting current, and is finally saturated, and the negative voltage (the product of voltage and time) in Vp is larger than the positive volt-second product, so that the magnetic reset is thorough.
According to
The formula (1-1) can be obtained,
namely, it is
Wherein D is the duty cycle, Vin input voltage, Vo output voltage, Np is the primary winding (number of turns), Nm is the reset winding (number of turns). For example, the magnetic reset duty cycle condition: np is Nm, and D is less than or equal to 0.5.
In one embodiment, the invention provides a power supply comprising a magnetic field reset system as above. The power supply can be various, such as a push-pull switching power supply and the like.
Fig. 6 is a schematic flow chart of an embodiment of a magnetic field resetting method according to the present invention, as shown in fig. 6:
And step 602, the reset execution device performs magnetic field reset processing on the target primary winding based on the control command.
In one embodiment, the reset control means comprises: the device comprises a current acquisition unit and an instruction processing unit. The current acquisition unit acquires current information, and the instruction processing unit determines a target primary winding based on the current information in a state that all primary windings are disconnected from the input voltage, generates a control command and sends the control command to the reset execution device.
The number of primary windings is two, and the instruction processing unit includes: and the comparator module determines the larger current of the two currents corresponding to the two target primary windings and determines the primary winding corresponding to the larger current as the target primary winding. The instruction processing unit includes: the circuit comprises a latch module, a clock circuit module and an amplifying circuit module. The clock circuit module sends a clock signal to the latch module, the latch module generates a level signal according to a comparison result signal output by the comparator module and sends the level signal to the amplifying circuit module, and the amplifying circuit module generates a control command based on the level signal and sends the control command to the reset execution device.
The reset execution device includes: a switch control unit and a reset processing unit. The switch control unit controls the on-off of a connecting circuit between the reset processing unit and the primary winding based on the control command, so that the reset processing unit is communicated with the target primary winding and is disconnected with other primary windings. And the reset processing unit carries out magnetic field reset processing on the target primary winding. The switch control unit includes: and the switching tube is arranged in the connecting circuit and controls the connection and disconnection of the connecting circuit based on the control command.
The reset processing unit includes: and the reset winding generates reset energy when being communicated with the target primary winding, and the reset energy and the energy generated by the target primary winding are mutually offset. The reset processing unit includes: and the reset resistor is used for carrying out magnetic field reset treatment on the target primary winding when the reset resistor is communicated with the target primary winding and the reset winding.
The magnetic field reset system, the magnetic field reset method and the power supply in the embodiments can determine a target primary winding to be subjected to magnetic field reset processing based on the acquired current information of the primary winding of the transformer, and perform magnetic field reset processing on the target primary winding; the magnetic field energy of the primary winding is eliminated, so that the primary energy of the transformer can be balanced, the normal operation of the transformer can be ensured, the working efficiency of a power supply is improved, the stable operation of electronic equipment is ensured, and the use sensitivity of a user can be improved.
The method and system of the present invention may be implemented in a number of ways. For example, the methods and systems of the present invention may be implemented in software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustrative purposes only, and the steps of the method of the present invention are not limited to the order specifically described above unless specifically indicated otherwise. Furthermore, in some embodiments, the present invention may also be embodied as a program recorded in a recording medium, the program including machine-readable instructions for implementing a method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (19)
1. A magnetic field reset system comprising:
reset control means and reset execution means;
the reset control device is used for acquiring current information of at least two primary windings of the transformer, determining a target primary winding needing magnetic field reset processing based on the current information, generating a control command and sending the control command to the reset execution device;
the reset execution device is used for carrying out magnetic field reset processing on the target primary winding based on the control command;
wherein the reset execution device comprises: the switch control unit is used for carrying out magnetic field resetting processing on the target primary winding and a resetting processing unit; and the switch control unit is used for controlling the on-off of a connecting line between the reset processing unit and the primary winding based on the control command so as to enable the reset processing unit to be communicated with the target primary winding and disconnected with other primary windings.
2. The system of claim 1, wherein,
the reset control device includes:
the current acquisition unit is connected with the primary winding and is used for acquiring the current information;
and the instruction processing unit is used for determining the target primary winding based on the current information, generating the control command and sending the control command to the reset execution device under the condition that all primary windings are disconnected from the input voltage.
3. The system of claim 2, wherein the number of primary windings is two;
the instruction processing unit includes:
and the comparator module is used for determining the larger current of the two currents corresponding to the two primary windings and determining the primary winding corresponding to the larger current as the target primary winding.
4. The system of claim 3, wherein,
the instruction processing unit includes: the circuit comprises a latch module, a clock circuit module and an amplifying circuit module;
the clock circuit module sends a clock signal to the latch module; the latch module generates a level signal according to the comparison result signal output by the comparator module and sends the level signal to the amplifying circuit module; the amplifying circuit module generates the control command based on the level signal and sends the control command to the reset execution device.
5. The system of claim 1, wherein,
the switch control unit includes:
and the switching tube is arranged in the connecting line and used for controlling the connection and disconnection of the connecting line based on the control command.
6. The system of claim 5, wherein,
the switching tube includes: NPN type triode, IGBT and NMOS transistor.
7. The system of claim 1, wherein,
the reset processing unit includes:
and the reset winding is arranged on the primary side of the transformer and used for generating reset energy when being communicated with the target primary side winding so as to offset the energy of the target primary side winding and carry out magnetic field reset treatment.
8. The system of claim 7, wherein,
the reset processing unit includes: resetting the resistor; and when the reset resistor is communicated with the target primary winding and the reset winding, the reset resistor is used for carrying out magnetic field reset treatment on the target primary winding.
9. The system of claim 7, wherein the number of turns of the at least two primary windings is the same;
duty cycle of the transformer
Where Np is the number of turns of the primary winding and Nm is the number of turns of the reset winding.
10. The system of claim 1, wherein,
the transformer includes: a push-pull transformer; the push-pull transformer comprises two primary windings with the same number of turns.
11. A power supply, comprising:
a magnetic field resetting system according to any of claims 1 to 10.
12. A magnetic field resetting method comprising:
the method comprises the steps that a reset control device collects current information of at least two primary windings of a transformer, determines a target primary winding needing magnetic field reset processing based on the current information, generates a control command and sends the control command to a reset execution device;
the reset execution device carries out magnetic field reset processing on the target primary winding based on the control command;
wherein the reset execution device comprises: a switch control unit and a reset processing unit; the switch control unit controls the on-off of a connecting circuit between the reset processing unit and the primary winding based on the control command so as to enable the reset processing unit to be communicated with the target primary winding and disconnected with other primary windings;
and the reset processing unit carries out magnetic field reset processing on the target primary winding.
13. The method of claim 12, wherein the reset control means comprises: the device comprises a current acquisition unit and an instruction processing unit; the method further comprises the following steps:
the current acquisition unit acquires the current information;
and the instruction processing unit determines the target primary winding based on the current information under the condition that all primary windings are disconnected from the input voltage, generates the control command and sends the control command to the reset execution device.
14. The method of claim 13, wherein the number of primary windings is two, and the instruction processing unit comprises: a comparator module; the determining the target primary winding based on the current information includes:
the comparator module determines a larger current of the two currents corresponding to the two primary windings, and determines the primary winding corresponding to the larger current as the target primary winding.
15. The method of claim 14, wherein the instruction processing unit comprises: the circuit comprises a latch module, a clock circuit module and an amplifying circuit module; the generating the control command and sending the control command to the reset execution device comprises:
the clock circuit module sends a clock signal to the latch module;
the latch module generates a level signal according to the comparison result signal output by the comparator module and sends the level signal to the amplifying circuit module;
the amplifying circuit module generates the control command based on the level signal and sends the control command to the reset execution device.
16. The method of claim 12, the switch control unit comprising: a switching tube, wherein,
the switch tube is arranged in the connecting line and controls the connection and disconnection of the connecting line based on the control command.
17. The method of claim 12, the resetting the processing unit comprising: a reset winding, wherein,
the reset winding generates reset energy when being communicated with the target primary winding, and the reset energy and the energy generated by the target primary winding are mutually offset.
18. The method of claim 17, the resetting the processing unit comprising: resetting the resistor; wherein the content of the first and second substances,
and when the reset resistor is communicated with the target primary winding and the reset winding, the reset resistor performs magnetic field reset treatment on the target primary winding.
19. The method of any one of claims 12 to 18,
the transformer includes: a push-pull transformer; the push-pull transformer comprises two primary windings with the same number of turns.
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| CN201910514900.0A Active CN110212779B (en) | 2019-06-14 | 2019-06-14 | Magnetic field reset system, method and power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4047046A (en) * | 1976-01-06 | 1977-09-06 | Westinghouse Electric Corporation | Circuit for setting magnetic remanence in a magnetizable core |
| JPH04183279A (en) * | 1990-11-16 | 1992-06-30 | Sanken Electric Co Ltd | Power source |
| JP2004015900A (en) * | 2002-06-05 | 2004-01-15 | Omron Corp | Electric power conversion system of push-pull circuit |
| JP6424733B2 (en) * | 2015-05-15 | 2018-11-21 | 株式会社デンソー | Power converter controller |
| CN205901623U (en) * | 2016-09-29 | 2017-01-18 | 苏州弘鹏新能源有限公司 | Many windings are just swashing parallelly connected single -stage dc -to -ac converter of output |
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