WO2016023275A1 - 电流控制方法、电路、电源转换器及计算机存储介质 - Google Patents

电流控制方法、电路、电源转换器及计算机存储介质 Download PDF

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Publication number
WO2016023275A1
WO2016023275A1 PCT/CN2014/090056 CN2014090056W WO2016023275A1 WO 2016023275 A1 WO2016023275 A1 WO 2016023275A1 CN 2014090056 W CN2014090056 W CN 2014090056W WO 2016023275 A1 WO2016023275 A1 WO 2016023275A1
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Prior art keywords
current
diode
circuit
controllable switch
power supply
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PCT/CN2014/090056
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English (en)
French (fr)
Inventor
黄泽蓬
杨丽华
黄建华
彭轶
曹青
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中兴通讯股份有限公司
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Publication of WO2016023275A1 publication Critical patent/WO2016023275A1/zh

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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

Definitions

  • the present invention relates to circuit control technology, and more particularly to a current control method, a current control circuit, a power converter, and a computer storage medium.
  • the metal oxide semiconductor field effect transistor referred to as the MOS transistor
  • MOSFET metal oxide semiconductor field effect transistor
  • the MOS transistor has a small on-resistance and a fast turn-on speed, so the MOS transistor is used instead of the secondary side diode. Conducive to improve the efficiency of the whole machine.
  • reverse current which can also be called reverse current. Failure to control well can cause damage to the MOS transistor and damage the power converter. In practical applications, the current can be bidirectionally circulated when the MOS transistor is turned on.
  • the secondary MOS transistor fails to switch to the shutdown in time.
  • the current flows from the secondary side to the primary side, forming a reverse sink current. If the reverse current is too large, the MOS tube will burn out and damage the power supply circuit.
  • Embodiments of the present invention provide a current control method, a current control circuit, a power converter, and a computer storage medium, which can effectively prevent burnout of a MOS tube when a reverse current of a power converter is excessive.
  • the embodiment of the invention provides a current control circuit, which includes: a backflow current detecting circuit, a filter circuit and a protection circuit;
  • the reverse current detecting circuit is configured to detect a backflow current in the power supply circuit wave by wave, and control the reverse current to pass through the current detecting resistor to form a voltage on the current detecting resistor;
  • the filter circuit is configured to perform noise removal processing on the voltage to obtain a filtered voltage
  • the protection circuit is configured to perform a control operation of turning off the power supply circuit when it is determined that the filtered voltage exceeds a voltage threshold.
  • the controlling circuit performing the control operation of turning off the power supply circuit includes: turning off the synchronous rectifier in the power supply circuit or powering down the entire power supply circuit.
  • the backflow current detecting circuit comprises: a first diode, a second diode, a third diode, a fourth diode, a first controllable switch tube, and a second controllable Switch tube, current sense resistor, and current transformer.
  • the first diode and the second diode are connected in series through the first connection point to form a first series diode group; the third diode and the fourth diode pass The second connection point is connected in series to form a second series diode group; the first series diode group and the second series diode group are both connected in parallel with the current detecting resistor, the first diode and the third diode simultaneously and current detecting The non-ground terminals of the resistors are connected, and the conduction directions of the first diode and the third diode are directed from the first connection point to the current detecting resistor; the second diode and the fourth diode are simultaneously a grounding end of the current detecting resistor is connected, and a conducting direction of the second diode and the fourth diode is directed from the current detecting resistor to the second connecting point; the primary winding of the current transformer is connected in series in the power supply circuit The two ends of the secondary winding of the current transformer are respectively connected
  • the backflow current detecting circuit comprises: a first controllable switch, a second controllable switch, a third controllable switch, a fourth controllable switch, a current detecting resistor, and a current transformer.
  • the first controllable switch and the second controllable switch are connected in series through the first connection point to form a first series switch tube group; the third controllable switch and the fourth controllable switch Forming a second series switch tube group by connecting the second connection points; the first series switch tube group and the second series switch tube group are all connected in parallel with the current detecting resistor, the first controllable switch and the third controllable switch Simultaneously connected to the non-ground terminal of the current detecting resistor, the second controllable switch and the fourth controllable switch are simultaneously connected to the ground end of the current detecting resistor; the primary winding of the current transformer is connected in series in the power supply circuit. Both ends of the secondary winding of the current transformer are respectively connected to the first connection point and the second connection point.
  • the embodiment of the invention further provides a current control method, the method comprising:
  • the controlling operation of turning off the power supply circuit includes: turning off a synchronous rectifier in the power supply circuit or powering down the entire power supply circuit.
  • the embodiment of the invention further provides a power converter, comprising: a power supply circuit and a current control circuit; the current control circuit is connected to an input end of the power supply circuit;
  • the current control circuit is configured to detect a reverse current in the power supply circuit wave by wave, and control the reverse current to pass through the current detecting resistor to form a voltage on the current detecting resistor; and denoise the voltage to obtain a filtering a subsequent voltage; when it is determined that the filtered voltage exceeds a voltage threshold, performing a control operation of turning off the power supply circuit.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the current control method according to the embodiment of the invention.
  • the current control method, the current control circuit, the power converter and the computer storage medium provided by the embodiments of the present invention control the backflow current through the current detecting resistor by means of wave-by-wave detection of the backflow current in the power supply circuit, in the current detection
  • a voltage is formed on the resistor, and the voltage is subjected to a denoising process to obtain a filtered voltage.
  • the filtered voltage exceeds a voltage threshold, performing a control operation of turning off the power supply circuit.
  • the power supply circuit needs protection, which can greatly prevent the MOS tube from being burnt out due to the large backflow current, thereby protecting the power supply circuit, thereby prolonging the service life of the power converter.
  • the implementation of the present invention is simple, convenient, and easy to implement; and can be applied to various devices having different power supply voltages.
  • FIG. 1 is a schematic structural diagram of a current control circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a reverse current detecting circuit in a current control circuit according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a power supply circuit taking a full-bridge topology circuit and a secondary side synchronous rectification as an example according to an embodiment of the present invention
  • FIG. 4 is a timing diagram showing driving signals Drive Q1, Drive Q2, Drive Q3, Drive Q4, Drive A, and Drive B according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of another reverse current detecting circuit in a current control circuit according to an embodiment of the present invention.
  • FIG. 6 is a timing relationship diagram of driving signals Drive Q1, Drive Q2, Drive Q3, Drive Q4, Drive S1, Drive S2, Drive S3, and Drive S4 according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a power converter according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a current control circuit in a power converter according to an embodiment of the present invention.
  • FIG. 9 is a waveform diagram of a backflow current detected by an oscilloscope when a protection circuit is not added to the power supply circuit;
  • FIG. 10 is a waveform diagram of a backflow current detected by an oscilloscope after adding a protection circuit in a power supply circuit according to an embodiment of the present invention.
  • the backflow current in the power supply circuit is detected wave by wave, and the back sink current is controlled to pass through the current detecting resistor to form a voltage on the current detecting resistor; and then the voltage is denoised to obtain filtering. a subsequent voltage; when it is determined that the filtered voltage exceeds a voltage threshold, performing a control operation of turning off the power supply circuit.
  • controlling operation of turning off the power supply circuit may be to turn off the synchronous rectifier in the power supply circuit or power down the entire power supply circuit.
  • the power supply circuit may be a full bridge topology circuit, a half bridge topology circuit, an LC full bridge circuit, a shift full bridge circuit, a push pull circuit, etc.; the secondary side rectification mode of the power supply circuit may be synchronous rectification or center tap Wait.
  • the power supply circuit is a full-bridge topology circuit
  • the secondary side rectification mode of the power supply circuit is synchronous rectification as an example.
  • the current control circuit includes: a reverse current detecting circuit 10, a filter circuit 11, and a protection circuit 12;
  • the backflow current detecting circuit 10 is configured to detect a backflow current in the power supply circuit wave by wave, and control the backflow current to pass through the current detecting resistor to form a voltage on the current detecting resistor;
  • the filter circuit 11 is configured to perform denoising processing on the voltage to obtain a filtered voltage
  • the protection circuit 12 is configured to perform a control operation of turning off the power supply circuit when it is determined that the filtered voltage exceeds a voltage threshold.
  • the control operation of turning off the power supply circuit may be to turn off the synchronous rectifier in the power supply circuit or power down the entire power supply circuit.
  • the magnitude of the voltage threshold can be reasonably adjusted according to actual needs in the current control circuit.
  • the reverse current detecting circuit 10 includes: a first diode VD1 and a second diode. VD2, third diode VD3, fourth diode VD4, first controllable switch tube VT1, second controllable switch tube VT2, current sense resistor Rs, and current transformer CT.
  • the first diode VD1 and the second diode VD2 are connected in series through the first connection point to form a first series diode group;
  • the third diode VD3 and the fourth The diode VD4 is connected in series through the second connection point to form a second series diode group;
  • the first series diode group and the second series diode group are both connected in parallel with the current detecting resistor Rs, the first diode VD1 and the third
  • the diode VD3 is simultaneously connected to the non-ground terminal of the current detecting resistor Rs, and the conduction directions of the first diode VD1 and the third diode VD3 are directed from the first connection point to the current detecting resistor Rs;
  • the two diodes VD2 and the fourth diode VD4 are simultaneously connected to the ground of the current detecting resistor Rs, and the conducting directions of the second diode VD2 and the fourth diode VD4 are directed from the current detecting resistor Rs
  • the primary winding of the current transformer CT is connected in series in the power supply circuit, and the two ends of the secondary winding of the current transformer CT are respectively connected to the first connection point and the second connection point; the first controllable The drains of the switching transistor VT1 and the second controllable switching transistor VT2 are respectively mutually interacted with current Is connected across the secondary winding of the CT, the first controllable switch VT1 and VT2 gate of the second controllable switch are grounded.
  • resistors R1 and R2 are respectively connected between the gate and the gate of the first controllable switch tube VT1 and the second controllable switch tube VT2 to accelerate the first controllable switch tube VT1 and the second
  • the control switch VT2 discharges the junction capacitance between the gate and the gate when the switch is turned off.
  • FIG. 3 is a power supply circuit taking a full-bridge topology circuit and a secondary side synchronous rectification as an example of the present invention; Schematic diagram of the composition, the power supply circuit shown in FIG. 3, the backflow current detecting circuit shown in FIG. 2, and the driving signals Drive Q1, Drive Q2, Drive Q3, Drive Q4, Drive A, and The timing diagram of Drive B describes the implementation principle of the current control circuit of the embodiment of the present invention in detail.
  • the primary current of the current transformer CT in the circuit is forward current from CSA to CSB, and the current flowing from CSB to CSA is reverse current; when the switching transistors Q2 and Q3 are turned on in the power supply circuit, the switching transistors Q1 and Q4 are turned off.
  • the primary current of the current transformer CT is from the CSB to the CSA for the forward current, and the current flowing from the CSA to the CSB is the reverse current.
  • the switching transistors Q1 and Q4 are turned on in the power supply circuit and the switching transistors Q2 and Q3 are turned off by the control timing
  • the first controllable in the reverse current detecting circuit The switch tube VT1 is turned on, and the second controllable switch tube VT2 is turned off.
  • the primary current of the current transformer CT flows from the CSA through the CSB, and the reverse current flows from the CSB to the CSA.
  • the first controllable switching transistor VT1 is turned on, so that the forward current directly leads to the ground, so that the current detecting resistor Rs is not passed, and no voltage is formed on the current detecting resistor Rs.
  • the reverse current is forwarded through the fourth diode VD4, and then A current detecting resistor Rs is passed to form a proportional forward voltage on Rs.
  • the switching transistors Q1 and Q4 are turned off and the switching transistors Q2 and Q3 are turned on by controlling the timing
  • the first controllable switching transistor VT1 in the reverse current detecting circuit is turned off, and the second controllable switch is turned on.
  • the tube VT2 is turned on.
  • the primary current of the current transformer CT flows from the CSB to the CSA
  • the reverse current flows from the CSA to the CSB.
  • the second controllable switch tube VT2 is turned on, so that the forward current directly leads to the ground, thereby not passing through
  • the current detecting resistor Rs does not form a voltage on the current detecting resistor Rs.
  • the backflow current is detected at the bridge rectifier input end of the power supply circuit, and the wave-by-wave detection backflow current can be realized, and the real-time performance is high, and the reverse sink current can be processed quickly; the voltage on the current detecting resistor Rs can be directly observed. Determine whether the circuit has reverse sink current and reverse sink current under various working conditions, which is convenient for timely adjustment of the control operations performed by the subsequent protection circuit.
  • the secondary side of the current transformer CT will backflow current to the primary side.
  • the primary side of the current transformer CT detects that the reverse current is transmitted to the CT secondary side of the current transformer, and the reverse current detecting circuit can quickly convert the current into a forward voltage, and the larger the reverse current is, the current is detected.
  • the magnitude of the magnitude of the forward voltage detected by the resistor Rs is also larger.
  • the detected forward voltage is denoised by a filter circuit to form a filtered voltage, and the second backwash voltage is transmitted to the protection circuit for processing.
  • the bandwidth is set too wide, the filtering capability is too weak, and the noise filtering effect is not achieved. It is possible that the filtered voltage transmitted to the protection circuit is erroneous due to noise; if the bandwidth is set too narrow, filtering The ability is too strong, it is possible to filter the peak value of the filtered voltage corresponding to the waveform, that is, the peak point indicating the reverse current is filtered out; thus, setting the bandwidth too wide or too narrow will cause the back-end protection circuit to be unable to accurately determine Determining whether the filtered voltage exceeds a voltage threshold, so that, on the one hand, if the bandwidth is too strong, the filtering capability is too strong, and the power converter may be burned due to the control operation of turning off the power supply circuit is not performed, thereby No protection The purpose of the power converter; on the other hand, if the bandwidth is too narrow, the filtering circuit is not sufficient to weaken some noise interference in the signal, resulting in unnecessary false triggering action. Therefore, in practical applications, the
  • the filtered voltage delivered from the filter circuit is received by the protection circuit.
  • the protection circuit performs a control operation to turn off the power supply circuit when it is determined that the filtered voltage exceeds a voltage threshold.
  • the filtered voltage threshold when the filtered voltage threshold is exceeded, it means that the reverse current in the power supply circuit has reached or is about to reach the damaged circuit condition.
  • the magnitude of the voltage threshold can be reasonably adjusted by the current control circuit according to actual needs.
  • FIG. 5 is a schematic structural diagram of another reverse current detecting circuit in a current control circuit according to an embodiment of the present invention.
  • the reverse current detecting circuit 10 includes: a first controllable switch S1, and a second controllable The switch S2, the third controllable switch S3, the fourth controllable switch S4, the current detecting resistor Rs, and the current transformer CT.
  • the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, and the fourth controllable switch S4 may all adopt a MOS tube; specifically, the MOS tube is controlled by controlling the gate voltage Turn on or off the effect.
  • the first controllable switch S1 and the second controllable switch S2 are connected in series through the first connection point to form a first series switch tube group;
  • the third controllable switch S3 and The fourth controllable switch S4 is connected in series through the second connection point to form a second series switch tube group;
  • the first series switch tube group and the second series switch tube group are both connected in parallel with the current detecting resistor Rs, the first controllable
  • the switch S1 and the third controllable switch S3 are simultaneously connected to the non-ground terminal of the current detecting resistor Rs, and the second controllable switch S2 and the fourth controllable switch S4 are simultaneously connected to the ground of the current detecting resistor Rs;
  • the primary winding of the transformer CT is connected in series in the power supply circuit, and the two ends of the secondary winding of the current transformer CT are respectively connected to the first connection point and the second connection point.
  • the timing diagram of the drive S4 describes the implementation principle of the current control circuit of the embodiment of the present invention in detail.
  • the switch tubes Q1 and Q4 are turned on in the power supply circuit, the switch tubes Q2 and Q3 are turned off, and the current mutual inductance in the back current detection circuit is reversed.
  • the primary current of the CT is from the CSA to the CSB for the forward current, and the current from the CSB to the CSA is the reverse current; when the switching transistors Q2 and Q3 are turned on in the power supply circuit, the switching transistors Q1 and Q4 are turned off, and the current transformer
  • the CT primary current flows from CSB to CSA for forward current, and the current from CSA to CSB is reverse current.
  • the first of the reverse current detecting circuits can be The control switch S1 and the fourth controllable switch S4 are turned off, and the second controllable switch S2 and the third controllable switch S3 are turned on.
  • the primary current of the current transformer CT flows from the CSA through the CSB, and the reverse current flows from the CSB to the CSA.
  • the switching transistors Q1 and Q4 are turned off and the switching transistors Q2 and Q3 are turned on by controlling the timing, the first controllable switch S1 and the fourth controllable switch S4 in the reverse current detecting circuit are turned on.
  • the second controllable switch S2 and the third controllable switch S3 are turned off.
  • the primary current of the current transformer CT flows from the CSB through the CSA, and the reverse current flows from the CSA to the CSB.
  • the backflow current is detected at the bridge rectifier input end of the power supply circuit, and the wave-by-wave detection backflow current can be realized, and the real-time performance is high, and the reverse sink current can be processed quickly; the voltage on the current detecting resistor Rs can be directly observed. Determine whether the circuit has reverse sink current and reverse sink current under various working conditions, which is convenient for timely adjustment of the control operations performed by the subsequent protection circuit.
  • the secondary side of the current transformer CT will backflow current to the primary side.
  • the primary side of the current transformer CT detects that the reverse current is transmitted to the CT secondary side of the current transformer, and the reverse current detecting circuit can quickly convert the current into a forward voltage, and the larger the reverse current is, the current is detected.
  • the magnitude of the magnitude of the forward voltage detected by the resistor Rs is also larger.
  • the detected forward voltage is denoised by a filter circuit to form a filtered voltage, and the filtered voltage is transmitted to a protection circuit for processing.
  • the bandwidth in the filter circuit can be based on actual circuit design needs and The specific situation of the layout board, and then through debugging to reasonably determine the bandwidth in the filter circuit; if the bandwidth is too wide, the filtering capability is too weak to achieve the filtering noise effect, and the filtered voltage that may be transmitted to the protection circuit is due to noise. If the bandwidth is too narrow and the filtering capability is too strong, it is possible to filter the peak value of the filtered voltage corresponding to the waveform, that is, to filter out the peak point of the reverse current; thus, setting the bandwidth too wide or too Narrow, it will cause the back-end protection circuit to not accurately determine whether the filtered voltage exceeds the voltage threshold. Further, the power converter may be burned due to the failure to perform the control operation of turning off the power supply circuit. The purpose of protecting the power converter.
  • the filtered voltage delivered from the filtering network is received by the protection circuit.
  • the protection circuit performs a control operation to turn off the power supply circuit when it is determined that the filtered voltage exceeds a voltage threshold.
  • the filtered voltage exceeds the voltage threshold, it means that the reverse current in the power supply circuit has reached or is about to reach the damaged circuit condition.
  • the magnitude of the voltage threshold can be reasonably adjusted by the current control circuit according to actual needs.
  • an embodiment of the present invention further provides a current control method, including: detecting a backflow current in a power supply circuit wave by wave, and controlling the reverse current through a current detecting resistor to be in a current detecting resistor Forming a voltage thereon; performing the denoising process on the voltage to obtain a filtered voltage; and performing a control operation of turning off the power supply circuit when determining that the filtered voltage exceeds a voltage threshold.
  • controlling operation of turning off the power supply circuit may be to turn off the synchronous rectifier in the power supply circuit or power down the entire power supply circuit.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the current control method according to the embodiment of the invention.
  • the embodiment of the present invention further provides a power converter, comprising: a power supply circuit 70 and a current control circuit 71;
  • the current control circuit 71 is connected to an input end of the power supply circuit 70;
  • the current control circuit 71 is configured to detect the backflow current in the power supply circuit 70 wave by wave, and control the reverse current to pass through the current detecting resistor to form a voltage on the current detecting resistor; and perform the denoising process on the voltage. A filtered voltage is obtained; and when it is determined that the filtered voltage exceeds a voltage threshold, a control operation of turning off the power supply circuit 70 is performed.
  • control operation of turning off the power supply circuit 70 may be to turn off the synchronous rectifier in the power supply circuit 70 or power down the entire power supply circuit.
  • the power supply circuit 70 may be a power supply circuit as shown in FIG.
  • the current control circuit 71 includes a backflow current detecting circuit 10, a filter circuit 11, and a protection circuit 12; wherein the composition of the backflow current detecting circuit 10 can be as described above. Figure 2 or Figure 5.
  • the backflow current detecting circuit 10 includes: a first diode VD1, a second diode VD2, a third diode VD3, a fourth diode VD4, and the first controllable The switch tube VT1, the second controllable switch tube VT2, the current detecting resistor Rs, and the current transformer CT.
  • the first diode VD1 and the second diode VD2 are connected in series through the first connection point to form a first series diode group; the third diode VD3 and the fourth The diode VD4 is connected in series through the second connection point to form a second series diode group; the first series diode group and the second series diode group are both connected in parallel with the current detecting resistor Rs, the first diode
  • the tube VD1 and the third diode VD3 are simultaneously connected to the non-ground terminal of the current detecting resistor Rs, and the conduction directions of the first diode VD1 and the third diode VD3 are directed from the first connection point to the current detecting resistor Rs; the second diode VD2 and the fourth diode VD4 are simultaneously connected to the ground of the current detecting resistor Rs, and the conduction direction of the second diode VD2 and the fourth diode VD4 is from the current The detecting resist
  • resistors R1 and R2 are respectively connected between the gate and the gate of the first controllable switch tube VT1 and the second controllable switch tube VT2 to accelerate the first controllable switch tube VT1 and the second The gate and gate junction capacitance of the control switch VT2 is discharged.
  • the backflow current detecting circuit 10 includes: a first controllable switch S1, a second controllable switch S2, a third controllable switch S3, a fourth controllable switch S4, and a current detecting resistor Rs. And current transformer CT.
  • the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, and the fourth controllable switch S4 may all adopt a MOS tube; specifically, the MOS tube is controlled by controlling the gate voltage Turn on or off the effect.
  • the first controllable switch S1 and the second controllable switch S2 are connected in series through the first connection point to form a first series switch tube group; the third controllable switch S3 and the The four controllable switches S4 are connected in series through the second connection point to form a second series switch tube group; the first series switch tube group and the second series switch tube group are both connected in parallel with the current detecting resistor Rs, the first controllable switch S1 and the third controllable switch S3 are simultaneously connected to the non-ground terminal of the current detecting resistor Rs, and the second controllable switch S2 and the fourth controllable switch S4 are simultaneously connected to the ground end of the current detecting resistor Rs;
  • the primary winding of the CT is connected in series in a power supply circuit, and the current transformer Both ends of the secondary winding of the CT are connected to the first connection point and the second connection point, respectively.
  • FIG. 9 is a waveform diagram of a reverse current detected by an oscilloscope when a protection circuit is not added to the power supply circuit
  • FIG. 10 is a waveform diagram of a reverse current detected by an oscilloscope after adding a protection circuit in the power supply circuit according to an embodiment of the present invention.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the device is implemented in a flow chart A function specified in a block or blocks of a process or multiple processes and/or block diagrams.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the backflow current in the power supply circuit is detected wave by wave, and the back sink current is controlled to pass through the current detecting resistor to form a voltage on the current detecting resistor, and the voltage is denoised to obtain a filtered a voltage; performing a control operation of turning off the power supply circuit when it is determined that the filtered voltage exceeds a voltage threshold.
  • the power supply circuit needs protection, which can greatly prevent the MOS tube from being burnt out due to the large backflow current, thereby protecting the power supply circuit, thereby prolonging the service life of the power converter.

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Abstract

一种电流控制电路（ 71）、电流控制方法、电源转换器及计算机存储介质，电流控制电路包括：反灌电流检测电路（ 10）、滤波电路（ 11）和保护电路（ 12）；反灌电流检测电路逐波检测供电电路（ 70）中的反灌电流，控制反灌电流通过电流检测电阻（ R S ），以在电流检测电阻上形成电压；滤波电路将电压进行去噪处理，得到滤波后的电压；保护电路在确定滤波后的电压超过电压阈值时，执行关断供电电路的控制操作。

Description

电流控制方法、电路、电源转换器及计算机存储介质 技术领域
本发明涉及电路控制技术，尤其涉及一种电流控制方法、电流控制电路、电源转换器及计算机存储介质。
背景技术
随着电子技术的快速发展，越来越多的电源需要高功率、高效率的电源转换器。在有些情况下，要求电源转换器输出电流大，但是输出电压小，因此降低副边损耗成为提高整机效率的关键。
在副边采用同步整流方式时，金属氧化物半导体型场效应管(Metal Oxide Semiconductor Field Effect Transistor，MOSFET)，简称MOS管，的导通电阻小，开通速度快，因此用MOS管代替副边二极管有利于提高整机效率。然而，同步整流存在一个缺陷，即反灌电流，也可称作反向电流，无法很好的控制会造成MOS管损坏，从而损坏电源转换器。在实际应用中，MOS管导通时电流是可以双向流通的，当原边输入端发生短路或者是从高输入电压快速切换到低输入电压时，如果副边MOS管没能及时切换到关断状态，则由于副边电压高于原边电压，使得电流从副边流向原边，形成反灌电流。如果反灌电流过大，会造成MOS管烧坏，从而损坏供电电路。
发明内容
本发明实施例提供一种电流控制方法、电流控制电路、电源转换器及计算机存储介质，能够在电源转换器出现反灌电流过大的情况下有效防止MOS管烧坏。
本发明实施例的技术方案是这样实现的：
本发明实施例提供一种电流控制电路，该电流控制电路包括：反灌电流检测电路、滤波电路和保护电路；
所述反灌电流检测电路，配置为逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
所述滤波电路，配置为将所述电压进行去噪处理，得到滤波后的电压；
所述保护电路，配置为在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
在一实施例中，所述保护电路执行关断所述供电电路的控制操作包括：关断所述供电电路中的同步整流管或将整个供电电路掉电。
在一实施例中，所述反灌电流检测电路包括：第一二极管、第二二极管、第三二极管、第四二极管、第一可控开关管、第二可控开关管、电流检测电阻、以及电流互感器。
进一步地，在所述反灌电流检测电路中，第一二极管和第二二极管通过第一连接点串联，形成第一串联二极管组；第三二极管和第四二极管通过第二连接点串联，形成第二串联二极管组；所述第一串联二极管组和第二串联二极管组均与电流检测电阻并联，所述第一二极管和第三二极管同时与电流检测电阻的非接地端相连，且所述第一二极管和第三二极管的导通方向从第一连接点指向电流检测电阻；所述第二二极管和第四二极管同时与电流检测电阻的接地端相连，且所述第二二极管和第四二极管的导通方向从电流检测电阻指向第二连接点；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连；第一可控开关管和第二可控开关管的漏极分别与电流互感器的副边绕组的两端相连，第一可控开关管和第二可控开关管的栅极均接地。
在一实施例中，所述反灌电流检测电路包括：第一可控开关、第二可控开关、第三可控开关、第四可控开关、电流检测电阻、以及电流互感器。
进一步地，在所述反灌电流检测电路中，第一可控开关和第二可控开关通过第一连接点串联，形成第一串联开关管组；第三可控开关和第四可控开关通过第二连接点串联，形成第二串联开关管组；所述第一串联开关管组和第二串联开关管组均与电流检测电阻并联，所述第一可控开关和第三可控开关同时与电流检测电阻的非接地端相连，所述第二可控开关和第四可控开关同时与电流检测电阻的接地端相连；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连。
本发明实施例还提供一种电流控制方法，该方法包括：
逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
将所述电压进行去噪处理，得到滤波后的电压；
在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
在一实施例中，所述关断所述供电电路的控制操作包括：关断所述供电电路中的同步整流管或将整个供电电路掉电。
本发明实施例又提供一种电源转换器，包括：供电电路和电流控制电路；所述电流控制电路连接于所述供电电路的输入端；
所述电流控制电路，配置为逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；将所述电压进行去噪处理，得到滤波后的电压；在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
本发明实施例还提供一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行本发明实施例所述的电流控制方法。
本发明实施例所提供的电流控制方法、电流控制电路、电源转换器及计算机存储介质，通过逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压，将所述电压进行去噪处理，得到滤波后的电压，在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。如此，通过检测反灌电流的大小来决定供电电路是否需要保护，可以极大的防止因为反灌电流太大造成MOS管烧坏，使供电电路得到保护，进而延长了电源转换器的使用寿命。
而且，本发明的实现方案简单、方便，易于实现；可适用于各种具有不同供电电源电压的设备中。
附图说明
图1为本发明实施例电流控制电路的组成结构示意图；
图2为本发明实施例电流控制电路中一反灌电流检测电路的组成结构示意图；
图3为本发明实施例以全桥拓扑电路和副边同步整流为例的供电电路的组成结构示意图；
图4为本发明实施例驱动信号Drive Q1、Drive Q2、Drive Q3、Drive Q4、Drive A、以及Drive B的时序关系图；
图5为本发明实施例电流控制电路中又一反灌电流检测电路的组成结构示意图；
图6为本发明实施例驱动信号Drive Q1、Drive Q2、Drive Q3、Drive Q4、Drive S1、Drive S2、Drive S3以及Drive S4的时序关系图；
图7为本发明实施例电源转换器的组成结构示意图；
图8为本发明实施例电源转换器中电流控制电路的组成结构示意图；
图9为供电电路中未加入保护电路时，通过示波器所检测到的反灌电流波形图；
图10为本发明实施例供电电路中增加保护电路后，通过示波器所检测到的反灌电流波形图。
具体实施方式
在本发明实施例中，逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；再将所述电压进行去噪处理，得到滤波后的电压；在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
这里，所述关断所述供电电路的控制操作可以为关断所述供电电路中的同步整流管或将整个供电电路掉电等。
这里，所述供电电路可以为全桥拓扑电路、半桥拓扑电路、LC全桥电路、移位全桥电路、推挽电路等；所述供电电路的副边整流方式可以为同步整流或中心抽头等。
需要说明的是，在后续对本发明实施例的描述中，均以所述供电电路为全桥拓扑电路，且所述供电电路的副边整流方式为同步整流的情况为例加以描述。
下面结合附图及具体实施例对本发明再作进一步详细的说明。
图1为本发明实施例电流控制电路的组成结构示意图，如图1所示，所述电流控制电路包括：反灌电流检测电路10、滤波电路11、保护电路12；
所述反灌电流检测电路10，配置为逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
所述滤波电路11，配置为将所述电压进行去噪处理，得到滤波后的电压；
所述保护电路12，配置为在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
这里，当所述滤波后的电压超过电压阈值时，即表示供电电路中反灌 电流已经达到或者将要达到损坏电路条件；所述关断所述供电电路的控制操作可以为关断所述供电电路中的同步整流管或将整个供电电路掉电等。
在实际应用中，所述电压阈值的大小可根据电流控制电路中的实际需要进行合理调整。
图2为本发明实施例电流控制电路中一反灌电流检测电路的组成结构示意图，如图2所示，所述反灌电流检测电路10包括：第一二极管VD1、第二二极管VD2、第三二极管VD3、第四二极管VD4、第一可控开关管VT1、第二可控开关管VT2、电流检测电阻Rs、以及电流互感器CT。
在如图2所示的反灌电流检测电路中，第一二极管VD1和第二二极管VD2通过第一连接点串联，形成第一串联二极管组；第三二极管VD3和第四二极管VD4通过第二连接点串联，形成第二串联二极管组；所述第一串联二极管组和第二串联二极管组均与电流检测电阻Rs并联，所述第一二极管VD1和第三二极管VD3同时与电流检测电阻Rs的非接地端相连，且所述第一二极管VD1和第三二极管VD3的导通方向从第一连接点指向电流检测电阻Rs；所述第二二极管VD2和第四二极管VD4同时与电流检测电阻Rs的接地端相连，且所述第二二极管VD2和第四二极管VD4的导通方向从电流检测电阻Rs指向第二连接点；所述电流互感器CT的原边绕组串联在供电电路中，所述电流互感器CT的副边绕组的两端分别与第一连接点和第二连接点相连；第一可控开关管VT1和第二可控开关管VT2的漏极分别与电流互感器CT的副边绕组的两端相连，第一可控开关管VT1和第二可控开关管VT2的栅极均接地。
进一步地，在所述第一可控开关管VT1和第二可控开关管VT2的栅极和门极之间分别接入电阻R1和R2，来加速第一可控开关管VT1和第二可控开关管VT2在关断时栅极和门极间结电容放电。
图3为本发明实施例以全桥拓扑电路和副边同步整流为例的供电电路 的组成结构示意图，下面结合图3所示的供电电路、图2所示的反灌电流检测电路、以及图4所示的驱动信号Drive Q1、Drive Q2、Drive Q3、Drive Q4、Drive A、以及Drive B的时序关系图对本发明实施例电流控制电路的实现原理进行详细描述。
需要补充说明的是，在具体描述本发明实施例电流控制电路的实施过程之前，可预先规定，当供电电路中开关管Q1、Q4导通时，开关管Q2、Q3关断，反灌电流检测电路中电流互感器CT的原边电流从CSA流向CSB为正向电流，从CSB流向CSA的电流为反灌电流；当供电电路中开关管Q2、Q3导通时，开关管Q1、Q4关断，电流互感器CT原边电流从CSB流向CSA为正向电流，从CSA流向CSB的电流为反灌电流。
首先，在本发明实施例电流控制电路的实施过程中，当通过控制时序，使得供电电路中开关管Q1、Q4开通，开关管Q2、Q3关断时，反灌电流检测电路中第一可控开关管VT1导通，第二可控开关管VT2关断。此时，电流互感器CT原边正向电流从CSA流过CSB，反灌电流从CSB流向CSA。根据同名端关系，正向电流从csa输入后，由于第一可控开关管VT1导通，使得正向电流直接导地，从而不经过电流检测电阻Rs，不会在电流检测电阻Rs上形成电压。同时，反灌电流从csb输入后，由于第二可控开关管VT2关断，且根据二极管的正向导通及反向截止特性，反灌电流正向导通先经过第四二极管VD4，再经过电流检测电阻Rs，从而在Rs上形成一定比例的正向电压。
同理，当通过控制时序，使得供电电路中开关管Q1、Q4关断，开关管Q2、Q3导通时，反灌电流检测电路中第一可控开关管VT1关断，第二可控开关管VT2导通。此时，电流互感器CT原边正向电流从CSB流向CSA，反灌电流从CSA流向CSB。根据同名端关系，正向电流从csb输入后，由于第二可控开关管VT2导通，使得正向电流直接导地，从而不经过 电流检测电阻Rs，不会在电流检测电阻Rs上形成电压。同时，反向电流会从csa输入后，由于第一可控开关管VD1关断，且根据二极管的正向导通及反向截止特性，反灌电流正向导通先经过第一二极管VD1，再经过电流检测电阻，从而在Rs上形成一定比例的正向电压。
因此，根据电流检测电阻Rs上电流和电压之间的线性关系，当反灌电流越大，从电流检测电阻上检测出的电压幅度值也越大。
如此，在供电电路的桥式整流输入端检测反灌电流，能够实现逐波检测反灌电流，实时性高，方便快速对反灌电流做出处理；通过直接观察电流检测电阻Rs上电压可以直观的确定电路在各种工作状态下是否存在反灌电流及反灌电流大小，便于对后续保护电路所执行的控制操作进行及时调整。
在实际应用中，在本发明实施例供电电路出现输入短路，快速调压，输入瞬变等情况下，电流互感器CT副边会向原边反灌电流。此时电流互感器CT原边检测出反向电流传递给电流互感器CT副边，反灌电流检测电路就能够快速将该电流转化为正向电压，且反灌电流越大时，通过电流检测电阻Rs检测出的正向电压的幅度值也越大。
其次，为了减小噪声干扰，通过滤波电路对检测出的正向电压进行去噪处理，形成滤波后的电压，并将第二反灌电压传送至保护电路进行处理。
这里，值得注意的是，若设置带宽过宽，滤波能力太弱，达不到滤除噪声效果，有可能传送给保护电路的滤波后的电压因噪声影响而出错；若设置带宽过窄，滤波能力太强，有可能将滤波后的电压对应波形中的峰值滤平，即将表示反灌电流的峰值点滤除掉；这样，设置带宽过宽或过窄，都会造成后端保护电路无法准确判断确定所述滤波后的电压是否超过电压阈值，这样，一方面，如果带宽过强，滤波能力过强，有可能由于未执行关断所述供电电路的控制操作，造成电源转换器被烧毁，从而达不到保护 电源转换器的目的；另一方面，如果带宽过窄，通过滤波电路不足以削弱信号中的一些噪声干扰，导致不必要的误触发动作。因此，在实际应用中，可以根据实际电路设计需要和布板的具体情况，再通过调试来合理确定滤波电路中的带宽。
最后，通过保护电路接收从滤波电路传递的滤波后的电压。所述保护电路在确定滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
这里，当所述滤波后的超过电压阈值时，即表示供电电路中反灌电流已经达到或者将要达到损坏电路条件。
在实际应用中，所述电压阈值的大小可根据实际需要通过电流控制电路进行合理调整。
需要说明的是，由于现有技术中单纯的保护电路的方案较多，在此不再给出具体的电路，只要在判断确定所述滤波后的电压超出根据电流控制电路的实际需要所设置电压阈值的情况下，通过执行关断所述供电电路中的同步整流管或将整个供电电路掉电等操作，能够达到有效防止MOS管烧坏或有效防止电源转换器损坏的目的即可。
图5为本发明实施例电流控制电路中又一反灌电流检测电路的组成结构示意图，如图5所示，所述反灌电流检测电路10包括：第一可控开关S1、第二可控开关S2、第三可控开关S3、第四可控开关S4、电流检测电阻Rs、以及电流互感器CT。
这里，所述第一可控开关S1、第二可控开关S2、第三可控开关S3、第四可控开关S4均可采用MOS管；具体地，MOS管通过对门极电压的控制来达到开通或关断效果。
在如图5所示的反灌电流检测电路中，第一可控开关S1和第二可控开关S2通过第一连接点串联，形成第一串联开关管组；第三可控开关S3和 第四可控开关S4通过第二连接点串联，形成第二串联开关管组；所述第一串联开关管组和第二串联开关管组均与电流检测电阻Rs并联，所述第一可控开关S1和第三可控开关S3同时与电流检测电阻Rs的非接地端相连，所述第二可控开关S2和第四可控开关S4同时与电流检测电阻Rs的接地端相连；所述电流互感器CT的原边绕组串联在供电电路中，所述电流互感器CT的副边绕组的两端分别与第一连接点和第二连接点相连。
下面结合图3所示的供电电路、图5所示的反灌电流检测电路、以及图6所示的驱动信号Drive Q1、Drive Q2、Drive Q3、Drive Q4、Drive S1、Drive S2、Drive S3以及Drive S4的时序关系图对本发明实施例电流控制电路的实现原理进行详细描述。
具体地，在描述本发明实施例电流控制电路的实施过程之前，可预先规定，当供电电路中开关管Q1、Q4导通时，开关管Q2、Q3关断，反灌电流检测电路中电流互感器CT的原边电流从CSA流向CSB为正向电流，从CSB流向CSA的电流为反灌电流；当供电电路中开关管Q2、Q3导通时，开关管Q1、Q4关断，电流互感器CT原边电流从CSB流向CSA为正向电流，从CSA流向CSB的电流为反灌电流。
首先，在本发明实施例电流控制电路的实施过程中，当通过控制时序，使得供电电路中开关管Q1、Q4导通，开关管Q2、Q3关断时，反灌电流检测电路中第一可控开关S1、第四可控开关S4关断，第二可控开关S2、第三可控开关S3导通。此时，电流互感器CT原边正向电流从CSA流过CSB，反灌电流从CSB流向CSA。根据同名端关系，正向电流从csa输入后，由于第一可控开关S1关断且第二可控开关S2导通，使得正向电流直接导地，从而不经过电流检测电阻Rs，从而不会在电流检测电阻Rs上形成电压。同时，反灌电流从csb输入后，由于第三可控开关S3导通且第四可控开关S4关断，使得反灌电流先经过第三可控开关S3，再经过电流检测电阻Rs，从 而在Rs上形成一定比例的正向电压。
同理，当通过控制时序，使得供电电路中开关管Q1、Q4关断，开关管Q2、Q3导通时，反灌电流检测电路中第一可控开关S1、第四可控开关S4导通，第二可控开关S2、第三可控开关S3关断。此时，电流互感器CT原边正向电流从CSB流过CSA，反灌电流从CSA流向CSB。根据同名端关系，正向电流从csb输入后，由于第三可控开关S3导通且第四可控开关S4关断，使得正向电流直接导地，从而不经过电流检测电阻Rs，从而不会在电流检测电阻Rs上形成电压。同时，反灌电流从csa输入后，由于第二可控开关S2导通且第一可控开关S1关断，使得反灌电流先经过第二可控开关S2，再经过电流检测电阻Rs，从而在Rs上形成一定比例的正向电压。
因此，根据电流检测电阻Rs上电流和电压之间的线性关系，当反灌电流越大，从电流检测电阻上检测出的电压幅度值也越大。
如此，在供电电路的桥式整流输入端检测反灌电流，能够实现逐波检测反灌电流，实时性高，方便快速对反灌电流做出处理；通过直接观察电流检测电阻Rs上电压可以直观的确定电路在各种工作状态下是否存在反灌电流及反灌电流大小，便于对后续保护电路所执行的控制操作进行及时调整。
在实际应用中，在本发明实施例供电电路出现输入短路，快速调压，输入瞬变等情况下，电流互感器CT副边会向原边反灌电流。此时电流互感器CT原边检测出反向电流传递给电流互感器CT副边，反灌电流检测电路就能够快速将该电流转化为正向电压，且反灌电流越大时，通过电流检测电阻Rs检测出的正向电压的幅度值也越大。
其次，为了减小噪声干扰，通过滤波电路对检测出的正向电压进行去噪处理，形成滤波后的电压，并将滤波后的电压传送至保护电路进行处理。
这里，值得注意的是，在实际应用中，可以根据实际电路设计需要和 布板的具体情况，再通过调试来合理确定滤波电路中的带宽；若设置带宽过宽，滤波能力太弱，达不到滤除噪声效果，有可能传送给保护电路的滤波后的电压因噪声影响而出错；若设置带宽过窄，滤波能力太强，有可能将滤波后的电压对应波形中的峰值滤平，即将表示反灌电流的峰值点滤除掉；这样，设置带宽过宽或过窄，都会造成后端保护电路无法准确判断确定所述滤波后的电压是否超过电压阈值，进而有可能由于未执行关断所述供电电路的控制操作，造成电源转换器被烧毁，从而达不到保护电源转换器的目的。
最后，通过保护电路接收从滤波网络传递的滤波后的电压。所述保护电路在确定滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
这里，当所述滤波后的电压超过电压阈值时，即表示供电电路中反灌电流已经达到或者将要达到损坏电路条件。
在实际应用中，所述电压阈值的大小可根据实际需要通过电流控制电路进行合理调整。
需要说明的是，由于现有技术中单纯的保护电路的方案较多，在此不再给出具体的电路，只要在判断确定所述滤波后的电压超出根据电流控制电路的实际需要所设置电压阈值的情况下，通过执行关断所述供电电路中的同步整流管或将整个供电电路掉电等操作，能够达到有效防止MOS管烧坏或有效防止电源转换器损坏的目的即可。
基于上述电流控制电路，本发明实施例还提供了一种电流控制方法，该方法包括：逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；再将所述电压进行去噪处理，得到滤波后的电压；在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
这里，所述关断所述供电电路的控制操作可以为关断所述供电电路中的同步整流管或将整个供电电路掉电等。
本发明实施例还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行本发明实施例所述的电流控制方法。
基于上述电流控制电路，如图7所示，本发明实施例又提供了一种电源转换器，包括：供电电路70和电流控制电路71；
所述电流控制电路71连接于所述供电电路70的输入端；
所述电流控制电路71，配置为逐波检测供电电路70中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；将所述电压进行去噪处理，得到滤波后的电压；在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路70的控制操作。
这里，所述关断所述供电电路70的控制操作可以为关断所述供电电路70中的同步整流管或将整个供电电路掉电等。
这里，所述供电电路70可以为如图3所示的供电电路。
在一实施例中，如图8所示，所述电流控制电路71包括反灌电流检测电路10、滤波电路11和保护电路12；其中，所述反灌电流检测电路10的组成结构可以如上述图2或图5所示。
这里，如图2所示，所述反灌电流检测电路10包括：第一二极管VD1、第二二极管VD2、第三二极管VD3、第四二极管VD4、第一可控开关管VT1、第二可控开关管VT2、电流检测电阻Rs、以及电流互感器CT。
在如图2所示的反灌电流检测电路中，第一二极管VD1和第二二极管VD2通过第一连接点串联，形成第一串联二极管组；第三二极管VD3和第四二极管VD4通过第二连接点串联，形成第二串联二极管组；所述第一串联二极管组和第二串联二极管组均与电流检测电阻Rs并联，所述第一二极 管VD1和第三二极管VD3同时与电流检测电阻Rs的非接地端相连，且所述第一二极管VD1和第三二极管VD3的导通方向从第一连接点指向电流检测电阻Rs；所述第二二极管VD2和第四二极管VD4同时与电流检测电阻Rs的接地端相连，且所述第二二极管VD2和第四二极管VD4的导通方向从电流检测电阻Rs指向第二连接点；所述电流互感器CT的原边绕组串联在供电电路中，所述电流互感器CT的副边绕组的两端分别与第一连接点和第二连接点相连；第一可控开关管VT1和第二可控开关管VT2的漏极分别与电流互感器CT的副边绕组的两端相连，第一可控开关管VT1和第二可控开关管VT2的栅极均接地。
进一步地，在所述第一可控开关管VT1和第二可控开关管VT2的栅极和门极之间分别接入电阻R1和R2，来加速第一可控开关管VT1和第二可控开关管VT2的栅极和门极间结电容放电。
这里，如图5所示，所述反灌电流检测电路10包括：第一可控开关S1、第二可控开关S2、第三可控开关S3、第四可控开关S4、电流检测电阻Rs、以及电流互感器CT。
这里，所述第一可控开关S1、第二可控开关S2、第三可控开关S3、第四可控开关S4均可采用MOS管；具体地，MOS管通过对门极电压的控制来达到开通或关断效果。
在如图5所示的反灌电流检测电路中，第一可控开关S1和第二可控开关S2通过第一连接点串联，形成第一串联开关管组；第三可控开关S3和第四可控开关S4通过第二连接点串联，形成第二串联开关管组；所述第一串联开关管组和第二串联开关管组均与电流检测电阻Rs并联，所述第一可控开关S1和第三可控开关S3同时与电流检测电阻Rs的非接地端相连，所述第二可控开关S2和第四可控开关S4同时与电流检测电阻Rs的接地端相连；所述电流互感器CT的原边绕组串联在供电电路中，所述电流互感器 CT的副边绕组的两端分别与第一连接点和第二连接点相连。
图9为供电电路中未加入保护电路时，通过示波器所检测到的反灌电流波形图；图10为本发明实施例供电电路中增加保护电路后，通过示波器所检测到的反灌电流波形图。通过对图9和图10中所检测到的反灌电流波形图进行比较发现，在图9所示的供电电路中未加保护电路时，反灌电流会出现瞬间高达76A的情况，如此高的电流会造成MOS管瞬间电流过大，从而烧坏MOS管，从而损坏供电电路；而在本发明实施例供电电路中增加保护电路后，整个供电电路中的反灌电流得到极大的改善，将反灌电流很好地控制到12A，从而有效地防止反灌电流对供电电路的影响。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个 流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述仅是本发明实施例的实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明实施例原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明实施例的保护范围。
工业实用性
本发明实施例通过逐波检测供电电路中的反灌电流，并控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压，将所述电压进行去噪处理，得到滤波后的电压；在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。如此，通过检测反灌电流的大小来决定供电电路是否需要保护，可以极大的防止因为反灌电流太大造成MOS管烧坏，使供电电路得到保护，进而延长了电源转换器的使用寿命。

Claims (16)

  1. 一种电流控制电路，所述电流控制电路包括：反灌电流检测电路、滤波电路和保护电路；
    所述反灌电流检测电路，配置为逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
    所述滤波电路，配置为将所述电压进行去噪处理，得到滤波后的电压；
    所述保护电路，配置为在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
  2. 根据权利要求1所述的电流控制电路，其中，所述保护电路执行关断所述供电电路的控制操作包括：关断所述供电电路中的同步整流管或将整个供电电路掉电。
  3. 根据权利要求1或2所述的电流控制电路，其中，所述反灌电流检测电路包括：第一二极管、第二二极管、第三二极管、第四二极管、第一可控开关管、第二可控开关管、电流检测电阻、以及电流互感器。
  4. 根据权利要求3所述的电流控制电路，其中，在所述反灌电流检测电路中，第一二极管和第二二极管通过第一连接点串联，形成第一串联二极管组；第三二极管和第四二极管通过第二连接点串联，形成第二串联二极管组；所述第一串联二极管组和第二串联二极管组均与电流检测电阻并联，所述第一二极管和第三二极管同时与电流检测电阻的非接地端相连，且所述第一二极管和第三二极管的导通方向从第一连接点指向电流检测电阻；所述第二二极管和第四二极管同时与电流检测电阻的接地端相连，且所述第二二极管和第四二极管的导通方向从电流检测电阻指向第二连接点；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连；第一可控开关管和第二可控开关管的漏极分别与电流互感器的副边绕组的两端相连，第一可控 开关管和第二可控开关管的栅极均接地。
  5. 根据权利要求1或2所述的电流控制电路，其中，所述反灌电流检测电路包括：第一可控开关、第二可控开关、第三可控开关、第四可控开关、电流检测电阻、以及电流互感器。
  6. 根据权利要求5所述的电流控制电路，其中，在所述反灌电流检测电路中，第一可控开关和第二可控开关通过第一连接点串联，形成第一串联开关管组；第三可控开关和第四可控开关通过第二连接点串联，形成第二串联开关管组；所述第一串联开关管组和第二串联开关管组均与电流检测电阻并联，所述第一可控开关和第三可控开关同时与电流检测电阻的非接地端相连，所述第二可控开关和第四可控开关同时与电流检测电阻的接地端相连；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连。
  7. 一种电流控制方法，所述方法包括：
    逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
    将所述电压进行去噪处理，得到滤波后的电压；
    在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
  8. 根据权利要求7所述的方法，其中，所述关断所述供电电路的控制操作包括：关断所述供电电路中的同步整流管或将整个供电电路掉电。
  9. 一种电源转换器，包括：供电电路和电流控制电路；所述电流控制电路连接于所述供电电路的输入端；
    所述电流控制电路，配置为逐波检测供电电路中的反灌电流，并控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；将所述电压进行去噪处理，得到滤波后的电压；当确定所述滤波后的电压超过电 压阈值时，执行关断所述供电电路的控制操作。
  10. 根据权利要求9所述的电源转换器，其中，所述电流控制电路包括反灌电流检测电路、滤波电路和保护电路；
    所述反灌电流检测电路，配置为逐波检测供电电路中的反灌电流，控制所述反灌电流通过电流检测电阻，以在电流检测电阻上形成电压；
    所述滤波电路，配置为将所述电压进行去噪处理，得到滤波后的电压；
    所述保护电路，配置为在确定所述滤波后的电压超过电压阈值时，执行关断所述供电电路的控制操作。
  11. 根据权利要求10所述的电源转换器，其中，所述保护电路执行关断所述供电电路的控制操作包括：关断所述供电电路中的同步整流管或将整个供电电路掉电。
  12. 根据权利要求10或11所述的电源转换器，其中，所述反灌电流检测电路包括：第一二极管、第二二极管、第三二极管、第四二极管、第一可控开关管、第二可控开关管、电流检测电阻、以及电流互感器。
  13. 根据权利要求12所述的电源转换器，其中，在所述反灌电流检测电路中，第一二极管和第二二极管通过第一连接点串联，形成第一串联二极管组；第三二极管和第四二极管通过第二连接点串联，形成第二串联二极管组；所述第一串联二极管组和第二串联二极管组均与电流检测电阻并联，所述第一二极管和第三二极管同时与电流检测电阻的非接地端相连，且所述第一二极管和第三二极管的导通方向从第一连接点指向电流检测电阻；所述第二二极管和第四二极管同时与电流检测电阻的接地端相连，且所述第二二极管和第四二极管的导通方向从电流检测电阻指向第二连接点；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连；第一可控开关管和第二可控开关管的漏极分别与电流互感器的副边绕组的两端相连，第一可控 开关管和第二可控开关管的栅极均接地。
  14. 根据权利要求10或11所述的电源转换器，其中，所述反灌电流检测电路包括：第一可控开关、第二可控开关、第三可控开关、第四可控开关、电流检测电阻、以及电流互感器。
  15. 根据权利要求14所述的电源转换器，其中，在所述反灌电流检测电路中，第一可控开关和第二可控开关通过第一连接点串联，形成第一串联开关管组；第三可控开关和第四可控开关通过第二连接点串联，形成第二串联开关管组；所述第一串联开关管组和第二串联开关管组均与电流检测电阻并联，所述第一可控开关和第三可控开关同时与电流检测电阻的非接地端相连，所述第二可控开关和第四可控开关同时与电流检测电阻的接地端相连；所述电流互感器的原边绕组串联在供电电路中，所述电流互感器的副边绕组的两端分别与第一连接点和第二连接点相连。
  16. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求7或8所述的电流控制方法。
PCT/CN2014/090056 2014-08-13 2014-10-31 电流控制方法、电路、电源转换器及计算机存储介质 WO2016023275A1 (zh)

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