CN107785874B - Power supply protection method, device and circuit - Google Patents
Power supply protection method, device and circuit Download PDFInfo
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- CN107785874B CN107785874B CN201610767357.1A CN201610767357A CN107785874B CN 107785874 B CN107785874 B CN 107785874B CN 201610767357 A CN201610767357 A CN 201610767357A CN 107785874 B CN107785874 B CN 107785874B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1257—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to short circuit or wrong polarity in output circuit
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Abstract
The invention provides a power supply protection method, a device and a circuit, wherein the power supply protection circuit comprises: the auxiliary winding is used for sampling the voltage at two ends of an inductor in the switching power supply; the resistance-capacitance RC charging circuit is connected with the auxiliary winding and used for converting the voltage sampled by the auxiliary winding into a current signal; and the control circuit is used for controlling the switch of the switching power supply according to the current signal. The invention solves the problems of complex protection circuit and high cost of an overcurrent protection mode in the related technology, and further achieves the effects of improving the power density of a power supply and reducing the development cost.
Description
Technical Field
The invention relates to the field of communication, in particular to a power supply protection method, a power supply protection device and a power supply protection circuit.
Background
The switching power supply is developed towards the aims of high power density and high efficiency at present, the power density of the power supply is improved, and one direction is to select the power supply on the device level, for example, the power supply is packaged smaller by selecting the same specification; the other direction is to increase the switching frequency and further reduce the volume of the magnetic member. However, the switching frequency cannot be increased without limit, and is limited mainly by the switching loss. Besides the soft switching topology and new components, the multiphase staggered parallel connection also becomes one of the means of the high-efficiency high-power-density power supply. Although the advantages of multiple interleaving and parallel connection, such as reduction of the grade of selected components and magnetic elements, improvement of efficiency, reduction of input and output ripples, etc., are also caused by the disadvantages, the multiple interleaving means multiple transformers or multiple inductors compared to a single phase, which is not favorable for improving power density. Therefore, in order to improve the efficiency and the power density, the multi-phase interleaved topology with the magnetic coupling inductor is developed, two or more phases of the topology share a magnetic core, the windings are independent, the magnetic fluxes among the multiple phases are mutually superposed, and the topology has the input in series or parallel connection and the output in parallel connection. For this topology, if overcurrent protection is required, a protection circuit is added for each phase. If the short circuit and overcurrent protection function are not provided, the power supply components and parts can be damaged by any overload or short circuit with small probability, the power supply can be caused to be on fire seriously, and the danger is larger.
In the existing overcurrent or short-circuit protection circuit, a relatively common mode is to sample the output secondary current and sample the primary current for protection. The sampling output current signal is simple and clear to protect, because when the output is short-circuited, the output current can be increased to reach the threshold value to close the drive, and the mode is clear, so that the circuit has the defect that the circuit cannot detect the current of the short circuit of the secondary winding, and cannot respond to the protection of the short circuit of the output transformer winding. The method for sampling the primary current signal generally comprises resistance sampling and current transformer sampling, the current transformers in a high-power supply are used more frequently, the sampling current precision is higher, the sampling loss is low, and the isolation of the primary side and the secondary side can be realized.
Therefore, the overcurrent protection mode in the related technology has the problems of complex protection circuit and high cost.
Disclosure of Invention
The embodiment of the invention provides a power supply protection method, a power supply protection device and a power supply protection circuit, which at least solve the problems of complex protection circuit and high cost in an overcurrent protection mode in the related technology.
According to an embodiment of the present invention, there is provided a power protection circuit including: the auxiliary winding is used for sampling the voltage at two ends of an inductor in the switching power supply; the resistance-capacitance RC charging circuit is connected with the auxiliary winding and used for converting the voltage sampled by the auxiliary winding into a current signal; and the control circuit is used for controlling the switch of the switching power supply according to the current signal.
Optionally, the current further comprises: and the filtering circuit is used for filtering the current signal before the current signal enters the control circuit to obtain the filtered current signal.
Optionally, the current further comprises: and the rectifying circuit is connected with the RC charging circuit and used for rectifying the converted current signal to obtain the rectified current signal and sending the rectified current signal to the control circuit.
Optionally, the control circuit comprises: the judging circuit is used for obtaining a driving signal for controlling the driving circuit according to the current signal and a preset current reference value; and the driving circuit is connected with the judging circuit and used for driving the switching power supply to be switched on and off according to the obtained driving signal.
According to another embodiment of the present invention, there is provided a power protection method including: sampling voltages at two ends of an inductor in the switching power supply through an auxiliary winding; converting the voltage sampled by the auxiliary winding into a current signal; and controlling the switch of the switching power supply according to the current signal.
Optionally, before controlling the switching of the switching power supply according to the converted current signal, the method further includes: and filtering the converted current signal to obtain the filtered current signal.
Optionally, before controlling the switching of the switching power supply according to the converted current signal, the method further includes: and rectifying the converted current signal to obtain the rectified current signal.
Optionally, controlling the switch of the switching power supply according to the current signal includes: obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value; and driving the switching power supply to be switched on and off according to the obtained driving signal.
According to another embodiment of the present invention, there is provided a power protection apparatus including: the sampling module is used for sampling the voltage at two ends of an inductor in the switching power supply through the auxiliary winding; the conversion module is used for converting the voltage sampled by the auxiliary winding into a current signal; and the control module is used for controlling the switch of the switching power supply according to the current signal.
Optionally, the apparatus further comprises: and the filtering module is used for filtering the converted current signal to obtain the filtered current signal.
Optionally, the apparatus further comprises: and the rectification module is used for rectifying the converted current signal to obtain the rectified current signal.
Optionally, the control module comprises: the obtaining unit is used for obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value; and the control unit is used for driving the switching power supply to be switched on and off according to the obtained driving signal.
According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of: sampling the voltage at two ends of an inductor in the switching power supply through an auxiliary winding; converting the voltage sampled by the auxiliary winding into a current signal; and controlling the switch of the switching power supply according to the current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of: before controlling the switching of the switching power supply according to the converted current signal, the method further includes: and filtering the converted current signal to obtain the filtered current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of: before controlling the switching of the switching power supply according to the converted current signal, the method further includes: and rectifying the converted current signal to obtain the rectified current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of: controlling the switching of the switching power supply according to the current signal includes: obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value; and driving the switching power supply to be switched on and off according to the obtained driving signal.
According to the invention, the auxiliary winding is adopted to sample the voltage at two ends of the inductor in the switching power supply, and the voltage obtained by sampling is converted into the current through the RC charging current.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a power protection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an auxiliary winding over-current detection circuit in accordance with a preferred embodiment of the present invention;
FIG. 3 is a circuit diagram of an auxiliary winding full wave over current detection circuit according to a preferred embodiment of the present invention;
FIG. 4 is a circuit diagram of an auxiliary winding half-wave over-current detection circuit in accordance with a preferred embodiment of the present invention;
FIG. 5 is a flow diagram of a power protection method according to an embodiment of the invention;
FIG. 6 is a first block diagram of a power protection device according to an embodiment of the present invention;
FIG. 7 is a block diagram of a second embodiment of a power protection device according to the present invention;
fig. 8 is a block diagram of the structure of a power protection device according to an embodiment of the present invention;
fig. 9 is a block diagram of a control module 66 of the power protection apparatus according to the embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
The power protection circuit provided in this embodiment 1 can be connected to a switching power supply or a similar device having an inductor and requiring overcurrent or short-circuit protection. Fig. 1 is a block diagram of a power protection circuit according to an embodiment of the present invention. As shown in fig. 1, the power protection circuit 10 may include: an auxiliary winding 12, an RC charging circuit 14, and a control circuit 16, wherein,
an auxiliary winding 12 for sampling the voltage across an inductor in the switching power supply.
The RC charging circuit 14 is connected with the auxiliary winding 12 and used for converting the voltage sampled by the auxiliary winding into a current signal;
and a control circuit 16 for controlling the switching of the switching power supply according to the current signal.
Through the circuit, the auxiliary winding samples the voltages at two ends of the inductor in the switching power supply, and the sampled voltages are converted into currents through the RC charging currents.
Optionally, the power protection circuit 10 may further include a filter circuit, and the filter circuit may be configured to filter the current signal before the current signal enters the control circuit 16 to obtain a filtered current signal. The filtered current signal is passed to a control circuit 16 for controlling the switching of the switched mode power supply.
According to the technical scheme of the embodiment of the invention, the current signal is filtered by using the filter circuit, so that the peak burr of the signal can be eliminated, the current signal is relatively clean, and the accuracy of the control of the switching power supply is improved.
Optionally, the power protection circuit 10 may further include a rectifying circuit, configured to rectify the converted current signal to obtain a rectified current signal, and send the rectified current signal to the control circuit 16. The signal is changed into a positive signal through the rectifying circuit. The rectified current may be a full-wave rectified current or a half-wave rectified current. The signal can also be clamped forcibly by a negative clamping circuit.
According to the technical scheme of the embodiment of the invention, the signal is changed into the forward signal by using the rectifying circuit, so that the control circuit can conveniently control the switch of the switching power supply according to the current signal, and the convenience of controlling the switching power supply is improved.
Alternatively, the control circuit 16 may include: the circuit comprises a judgment circuit and a driving circuit, wherein the judgment circuit is used for obtaining a driving signal for controlling the driving circuit according to a current signal and a preset current reference value; and the driving circuit is connected with the judging circuit and used for driving the switching power supply to be switched on and off according to the obtained driving signal. The judgment circuit may be a comparator, and the preset current reference value may be set by a user in advance according to an empirical value, or may be set according to an input of the user during the operation. The drive circuit can be a hardware lockout drive or a DSP software judgment lockout drive circuit.
According to the technical scheme of the embodiment of the invention, the control circuit is realized by the judging circuit and the driving circuit, so that the convenience of controlling the switching power supply is improved.
Based on the above embodiments and optional implementations, to illustrate the whole process interaction of the scheme, in the preferred embodiment, an auxiliary winding overcurrent detection circuit (acting as the above power protection circuit) is provided, which can be used for protection of output short circuit or primary overcurrent of topologies such as inductors with multiple magnetic couplings or without magnetic couplings. The auxiliary winding overcurrent detection circuit will be explained below.
The auxiliary winding overcurrent protection circuit mainly utilizes resonant inductors, boosting inductors or coupling inductors and the like in various power supply topologies to participate in the voltage of an energy transfer inductor, the voltages at two ends of the auxiliary winding can rise sharply under the condition of output overcurrent or short circuit, the voltages at two ends are indirectly sampled by adding an inductor auxiliary winding, then the voltages are restored into current signals through an RC (resistance capacitance) charging circuit, and then the current signals are sent into a control circuit to block the driving through rectification, filtering and a comparator circuit.
Specifically, the auxiliary winding overcurrent detection circuit comprises a full-wave or half-wave rectification and filtering circuit. The voltage signal from the auxiliary winding is passed through RC charging circuit to make the upper surface of capacitor C reduce inductance current signal proportionally, then passed through rectifying filter circuit to obtain signal capable of being used as trigger protection, and fed into logic judgement circuit. For the logic judgment circuit (which may be software judgment or hardware judgment), the detected current Signal is sent to a comparator to obtain a switching Signal, and the switching Signal is sent to a Digital Signal Processor (DSP) or a hardware logic circuit switch driver.
Through the protection mode, the current transformer or the resistor is not required to be additionally added to sample primary and secondary currents, the current in the inductor can be indirectly sampled only by additionally adding an auxiliary winding (the multi-path magnetic coupling inductor can also only need one auxiliary winding) and an additional RC detection circuit (the function of the RC detection circuit is the same as that of the RC charging circuit) on the inductor, the error is small, the following effect is good, and the current transformer can be reliably used as a trigger signal of power supply overcurrent.
The structure of the auxiliary winding overcurrent detection circuit is described in detail below.
Fig. 2 is a schematic diagram of an auxiliary winding overcurrent detection circuit according to a preferred embodiment of the invention. For topologies with similar inductance functions such as Power Factor Correction (PFC) boost inductance, LLC resonant inductance, BUCK (BUCK) filter inductance and the like, the auxiliary winding overcurrent detection circuit is a simple and easy-to-use circuit. The circuit can be subdivided into six hardware circuit units. As shown in fig. 2, the auxiliary winding overcurrent detection circuit includes:
the inductor auxiliary winding 22 (which functions as the aforementioned auxiliary winding) is used to obtain the primary voltage of the inductor according to a preset proportion.
During overcurrent, the voltage across the inductor will rise rapidly, and the voltage across the inductor can be obtained according to a preset proportion by adding an n:1 auxiliary winding (i.e. the auxiliary winding 20 of the inductor shown in fig. 2 can realize the function) above the inductor. The selection of the turn ratio of the inductor to the auxiliary winding is mainly determined according to the voltage and the turn number of the primary inductor and the loss, and the aim is to enable the voltage value on the auxiliary winding to be far larger than the voltage value on the capacitor on the RC detection circuit.
The RC integral current detection circuit 24 (acting as the RC charging circuit) is configured to process the voltage signal obtained by the inductance auxiliary winding, and restore the inductance current signal according to a preset proportion.
The RC integral current detection circuit 24 mainly utilizes the fact that the initial rising stage of the capacitor voltage in the RC charging circuit can be equivalent to linear rising, so that the capacitor voltage can follow the inductor current in real time, and in order to eliminate untimely discharging caused by the influence of the capacitor integral, the RC is selected to be the one with the resistance R far larger than the capacitance reactance of the capacitor C, that is, the capacitance value of the capacitor C is smaller.
And a rectifying circuit 26 for rectifying the voltage signal detected by the RC.
The voltage signal detected by the RC becomes a forward voltage signal by a rectifying circuit 26 (for example, a full-wave detection circuit or a half-wave detection circuit). Whether full wave or half wave rectification is used or not is mainly determined according to the actual circuit requirements, and if only half wave current signals are sampled, reliable protection can be achieved, and half wave detection and full wave detection can be used.
And a filter circuit 28 for filtering the rectified voltage signal.
The rectified voltage signal can be filtered by a filter circuit (e.g., an RC filter circuit) to eliminate spike glitches, so that the signal arriving at the input terminal of the comparator circuit 210 is relatively clean, and thus, false operation is prevented. The value of the capacitor C in the RC filter circuit cannot be too large, for example, it can be within 50pF, so that the voltage following may be seriously affected by the integration effect.
A comparator circuit 210 (acting as the aforementioned decision circuit) for comparing the filtered voltage signal with the over-current protection signal (V)ref) The comparison is performed to generate a switching signal for controlling the control logic unit 212.
And a control logic unit 212 (acting as the driving circuit) for controlling the switching of the switching power supply according to the switching signal.
The signal output by the comparator circuit 210 can be sent to the control logic unit 212 for control, and the logic judgment of the control logic unit 212 can include hardware control logic or software DSP control logic. The software control logic is mainly implemented by triggering an interrupt switch by a TZ pin of a DSP, and the hardware control logic is mainly implemented by a protection pin of a hardware control Integrated Circuit (IC).
As for the rectifying circuit, a full-wave rectifying circuit or a half-wave rectifying circuit may be used to process a signal, and the following description will be made of a hardware circuit configuration of the full-wave rectifying circuit and the half-wave rectifying circuit, respectively.
Fig. 3 is a circuit diagram of an auxiliary winding full-wave overcurrent detection circuit according to a preferred embodiment of the present invention, and fig. 4 is a circuit diagram of an auxiliary winding half-wave overcurrent detection circuit according to a preferred embodiment of the present invention, and as shown in fig. 3 and 4, the auxiliary winding full-wave overcurrent detection circuit and the auxiliary winding half-wave overcurrent detection circuit differ mainly in the difference of the rectifier circuit parts (the RC integrated current detection current varies according to the type of the rectifier circuit): the rectifying circuit of the auxiliary winding full-wave overcurrent detection circuit is a full-wave rectifying circuit 32, and the rectifying circuit of the auxiliary winding half-wave overcurrent detection circuit is a half-wave rectifying circuit 42.
In the above technical solution of the preferred embodiment of the present invention, a simple DC-DC or AC-DC converter overcurrent or short-circuit protection circuit is provided. The topology applicable to the preferred embodiment is not limited to LLC, PSFB (Phase Shifted Full Bridge), PFC, and other topologies with inductors participating in the operation of the main power loop, and is particularly suitable for topologies with magnetically coupled inductors. Through the technical scheme of the embodiment of the invention, a simple and easy-to-use low-cost scheme is provided for overcurrent or short-circuit protection of the high-power switching power supply. By adopting the protection mode, the power supply power density is improved, and the development cost is reduced.
Example 2
In the present embodiment, a power protection method is provided, which can be operated on the power protection circuit provided in the above-described embodiments. Fig. 5 is a flowchart of a power protection method according to an embodiment of the present invention, and as shown in fig. 5, the flowchart includes the following steps:
step S502, sampling the voltage at two ends of an inductor in the switching power supply through an auxiliary winding;
step S504, converting the voltage sampled by the auxiliary winding into a current signal;
in step S506, the switching of the switching power supply is controlled according to the current signal.
Optionally, before step S506, the method may further include: and filtering the converted current signal to obtain a filtered current signal.
Optionally, before step S506, the method may further include: and rectifying the converted current signal to obtain a rectified current signal.
Optionally, step S506 may include: obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value; and driving the switching power supply to be switched on and off according to the obtained driving signal.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 3
In this embodiment, a power protection device is further provided, and the power protection device is used to implement the foregoing embodiments and preferred embodiments, and the description of the power protection device is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 6 is a first block diagram of a power protection device according to an embodiment of the present invention, and as shown in fig. 6, the device includes: a sampling module 62, a conversion module 64, and a control module 66, which are described below.
A sampling module 62 for sampling the voltage across the inductor in the switching power supply via the auxiliary winding; the conversion module 64 is connected with the sampling module 62 and is used for converting the voltage sampled by the auxiliary winding into a current signal; and the control module 66 is connected with the conversion module 64 and is used for controlling the on-off of the switching power supply according to the current signal.
Fig. 7 is a block diagram of a second structure of the power protection device according to the embodiment of the present invention, and as shown in fig. 7, the device includes, in addition to all modules shown in fig. 6:
and a filtering module 72, connected to the converting module 64 and the control module 66, for filtering the converted current signal to obtain a filtered current signal.
Fig. 8 is a block diagram of a third structure of a power protection device according to an embodiment of the present invention, and as shown in fig. 8, the device includes, in addition to all modules shown in fig. 6:
and the rectifying module 82 is connected with the converting module 64 and the control module 66 and is used for rectifying the converted current signal to obtain a rectified current signal.
Fig. 9 is a block diagram of a control module 66 of the power protection apparatus according to the embodiment of the present invention, and as shown in fig. 9, the control module 66 includes:
an obtaining unit 92, configured to obtain a driving signal for controlling the switching power supply to drive according to the current signal and a preset current reference value;
and a control unit 94 connected to the obtaining unit 92 for driving the switching power supply to be switched on and off according to the obtained driving signal.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 4
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, sampling the voltage at two ends of an inductor in the switching power supply through an auxiliary winding;
s2, converting the voltage sampled by the auxiliary winding into a current signal;
and S3, controlling the switch of the switch power supply according to the current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
before controlling the switch of the switching power supply according to the converted current signal, the method further comprises the following steps: and filtering the converted current signal to obtain a filtered current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
before controlling the switch of the switching power supply according to the converted current signal, the method further comprises the following steps: and rectifying the converted current signal to obtain a rectified current signal.
Optionally, the storage medium is further arranged to store program code for performing the steps of:
controlling the switching of the switching power supply according to the current signal includes:
s1, obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value;
and S2, driving the switch power supply to open and close according to the obtained driving signal.
Optionally, in this embodiment, the storage medium may include but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Optionally, in this embodiment, the processor executes, according to the program code stored in the storage medium: sampling voltages at two ends of an inductor in the switching power supply through an auxiliary winding; converting the voltage sampled by the auxiliary winding into a current signal; and controlling the switch of the switching power supply according to the current signal.
Optionally, in this embodiment, the processor executes, according to the program code stored in the storage medium: before controlling the switch of the switching power supply according to the converted current signal, the method further comprises the following steps: and filtering the converted current signal to obtain a filtered current signal.
Optionally, in this embodiment, the processor executes, according to the program code stored in the storage medium: before controlling the switch of the switching power supply according to the converted current signal, the method further comprises the following steps: and rectifying the converted current signal to obtain a rectified current signal.
Optionally, in this embodiment, the processor executes, according to the program code stored in the storage medium: controlling the switching of the switching power supply according to the current signal includes: obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value; and driving the switching power supply to be switched on and off according to the obtained driving signal.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A power protection circuit, comprising:
the auxiliary winding is used for sampling the voltage at two ends of an inductor in the switching power supply;
the auxiliary winding utilizes a boosting inductor or a coupling inductor to acquire the voltage of the boosting inductor or the coupling inductor in a short-circuit state;
the resistance-capacitance RC charging circuit is connected with the auxiliary winding and used for converting the voltage sampled by the auxiliary winding into a current signal;
the control circuit is used for controlling the switch of the switching power supply according to the current signal;
the rectification circuit is connected with the RC charging circuit and used for rectifying the converted current signal to obtain a rectified current signal and sending the rectified current signal to the control circuit;
the rectification circuit is a full-wave rectification circuit or a half-wave rectification circuit;
the control circuit includes: a judgment circuit and a drive circuit, wherein,
the judging circuit is used for obtaining a driving signal for controlling the driving circuit according to the current signal and a preset current reference value;
the driving circuit is connected with the judging circuit and used for driving the switching power supply to be switched on and off according to the obtained driving signal;
and the filtering circuit is used for filtering the current signal before the current signal enters the control circuit to obtain the filtered current signal.
2. A method of power protection, comprising:
sampling voltages at two ends of an inductor in the switching power supply through an auxiliary winding;
the auxiliary winding utilizes a boosting inductor or a coupling inductor to acquire the voltage of the boosting inductor or the coupling inductor in a short-circuit state;
converting the voltage sampled by the auxiliary winding into a current signal;
controlling the switch of the switching power supply according to the current signal;
before controlling the switching of the switching power supply according to the converted current signal, the method further includes:
rectifying the converted current signal to obtain a rectified current signal;
the rectification is full-wave rectification or half-wave rectification;
controlling the switching of the switching power supply according to the current signal includes:
obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value;
driving the switching power supply to be switched on and off according to the obtained driving signal;
before controlling the switching of the switching power supply according to the converted current signal, the method further includes:
and filtering the converted current signal to obtain the filtered current signal.
3. A power supply protection device, comprising:
the sampling module is used for sampling the voltage at two ends of an inductor in the switching power supply through the auxiliary winding;
the auxiliary winding utilizes a boosting inductor or a coupling inductor to acquire the voltage of the boosting inductor or the coupling inductor in a short-circuit state;
the conversion module is used for converting the voltage sampled by the auxiliary winding into a current signal;
the control module is used for controlling the switch of the switching power supply according to the current signal;
the rectification module is used for rectifying the converted current signal to obtain the rectified current signal;
the rectification is full-wave rectification or half-wave rectification;
the control module includes:
the obtaining unit is used for obtaining a driving signal for controlling the driving of the switching power supply according to the current signal and a preset current reference value;
the control unit is used for driving the switching power supply to be switched on and off according to the obtained driving signal;
and the filtering module is used for filtering the converted current signal to obtain the filtered current signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610767357.1A CN107785874B (en) | 2016-08-30 | 2016-08-30 | Power supply protection method, device and circuit |
| PCT/CN2017/093893 WO2018040789A1 (en) | 2016-08-30 | 2017-07-21 | Power supply protection circuit, method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610767357.1A CN107785874B (en) | 2016-08-30 | 2016-08-30 | Power supply protection method, device and circuit |
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| Publication Number | Publication Date |
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| CN107785874A CN107785874A (en) | 2018-03-09 |
| CN107785874B true CN107785874B (en) | 2022-05-10 |
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| CN109004620A (en) * | 2018-09-07 | 2018-12-14 | 奥克斯空调股份有限公司 | A kind of IGBT current foldback circuit and air conditioner |
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| WO2018040789A1 (en) | 2018-03-08 |
| CN107785874A (en) | 2018-03-09 |
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