CN113162421A - Power supply circuit and power supply equipment - Google Patents
Power supply circuit and power supply equipment Download PDFInfo
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- CN113162421A CN113162421A CN202110347882.9A CN202110347882A CN113162421A CN 113162421 A CN113162421 A CN 113162421A CN 202110347882 A CN202110347882 A CN 202110347882A CN 113162421 A CN113162421 A CN 113162421A
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- 238000004804 winding Methods 0.000 claims abstract description 170
- 238000004146 energy storage Methods 0.000 claims abstract description 79
- 238000005070 sampling Methods 0.000 claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims description 50
- 230000003750 conditioning effect Effects 0.000 claims description 17
- 238000007781 pre-processing Methods 0.000 claims description 13
- 230000001939 inductive effect Effects 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000005284 excitation Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention relates to the field of electronic circuits, and discloses a power supply circuit and power supply equipment. The power supply circuit comprises an energy storage inductor, a first switch tube, a second switch tube, a current transformer and a sampling processing circuit, wherein the current transformer comprises a first primary winding, a second primary winding and a secondary winding, the first primary winding is connected with the first switch tube in series to form a first current loop of the energy storage inductor, the second primary winding is connected with the second switch tube in series to form a second current loop of the energy storage inductor, the first primary winding flows through a first current and the second primary winding flows through a second current in turn in a preset switching period, the magnetic flux reset of the current transformer is realized, and the sampling processing circuit obtains information of the first current flowing through the first primary winding and information of the second current flowing through the second primary winding through the secondary winding. Therefore, by the mode, the reliability of system operation can be ensured without adding an additional reset circuit, and the precision of sampling current can be improved.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a power supply circuit and a power supply device.
Background
The current transformer is a device manufactured based on the electromagnetic induction principle, and comprises a primary winding and a secondary winding, when current flows through the primary winding of the current transformer, the secondary winding of the current transformer can induce the current, and the current transformer is widely applied to the isolation sampling of the current by virtue of the characteristic. However, the current transformer can only work in a single quadrant, that is, only can perform unidirectional excitation, so that the sampled current information can only reflect the zero crossing point of the current, and because the current transformer works in the single quadrant, if an additional reset circuit is not added, the current transformer has the risk of magnetic saturation, the working reliability of the system and the sampling precision of the current are greatly reduced, and the circuit structure becomes complicated by adding the reset circuit.
Disclosure of Invention
The embodiment of the invention provides a power supply circuit and power supply equipment, which can improve the reliability of system operation on the basis of simplifying the circuit structure.
The embodiment of the invention provides the following technical scheme for solving the related technical problems:
in a first aspect, an embodiment of the present invention provides a power supply circuit, including an energy storage inductor, a first switching tube, a second switching tube, a current transformer, and a sampling processing circuit;
the current transformer comprises a first primary winding, a second primary winding and a secondary winding, wherein a first end of the first primary winding and a first end of the second primary winding are connected with one end of an energy storage inductor, a second end of the first primary winding and a first switching tube are connected in series in a first current loop of the energy storage inductor, a second end of the second primary winding and a second switching tube are connected in series in a second current loop of the energy storage inductor, when the first switching tube is conducted, the energy storage inductor stores energy, the first primary winding and the first switching tube flow first current, when the second switching tube is conducted, the energy storage inductor releases energy, the second primary winding and the second switching tube flow second current, and the first switching tube and the second switching tube are alternately conducted in a preset switching period, so that the first primary winding flows through the first current and the second primary winding flows through the second current The secondary windings are alternately carried out in the preset switching period and are used for inducing a first current flowing through the first primary winding and a second current flowing through the second primary winding to obtain an induced current;
the sampling processing circuit is connected with the secondary winding and used for obtaining information of a first current flowing through the first primary winding and information of a second current flowing through the second primary winding according to the induced current of the secondary winding.
Optionally, the sampling processing circuit includes a conditioning circuit and a controller;
the conditioning circuit is connected with the secondary winding and used for obtaining sampling voltage according to the induced current;
the controller is connected with the conditioning circuit and used for obtaining the information of the first current or the information of the second current according to the sampling voltage.
Optionally, the conditioning circuit includes a preprocessing circuit and an operational amplifier circuit;
the preprocessing voltage is connected with the secondary winding and used for converting the induced current of the secondary winding into induced voltage;
the operational amplification circuit is respectively connected with the preprocessing circuit and the controller and used for obtaining the sampling voltage according to the induction voltage and outputting the sampling voltage to the controller.
Optionally, the preprocessing circuit includes a first resistor and a first capacitor;
the operational amplification circuit comprises a second resistor, a third resistor, a fourth resistor, a second capacitor and an operational amplifier;
the one end of first resistance, the one end of first electric capacity, the one end of second resistance and the first end of secondary winding are connected jointly, the other end of first resistance, the other end of first electric capacity, the one end of third resistance and the second end of secondary winding are connected jointly, the other end of second resistance is used for with reference voltage source and the first input of operational amplifier is connected, the other end of third resistance, the one end of fourth resistance, the second input of operational amplifier and the one end of second electric capacity are connected jointly, the output of operational amplifier, the other end of fourth resistance and the other end of second electric capacity with the controller is connected.
Optionally, the conditioning circuit includes a fifth resistor, a sixth resistor, and a third capacitor;
one end of the fifth resistor is connected with the first end of the secondary winding, the other end of the fifth resistor, one end of the sixth resistor and one end of the third capacitor are connected with the controller, and the other end of the sixth resistor, the other end of the third capacitor and the second end of the secondary winding are grounded together.
Optionally, the first switching tube is an MOS tube, and the second switching tube is a diode.
Optionally, a first output capacitor is further included;
one end of the first output capacitor is connected with the cathode of the diode, the anode of the diode is connected with the second end of the second primary winding, the other end of the first output capacitor is used for being connected with the negative electrode of the input power supply and the first end of the MOS tube, the second end of the MOS tube is connected with the second end of the first primary winding, the control end of the MOS tube is used for being input with a control signal, one end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, and the other end of the energy storage inductor is used for being connected with the anode of the input power supply.
Optionally, a second output capacitor is further included;
one end of the second output capacitor is connected with one end of the energy storage inductor, the other end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, the other end of the second output capacitor is used for being connected with the negative electrode of the input power supply and the anode of the diode, the cathode of the diode is connected with the second end of the second primary winding, the first end of the MOS tube is connected with the first end of the first primary winding, the second end of the MOS tube is used for being connected with the positive electrode of the input power supply, and the control end of the MOS tube is used for being inputted with a control signal.
Optionally, a third output capacitor is further included;
one end of the third output capacitor is connected with the anode of the diode, the cathode of the diode is connected with the second end of the second primary winding, the other end of the third output capacitor is used for being connected with the negative electrode of the input power supply and one end of the energy storage inductor, the other end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, the first end of the MOS tube is connected with the second end of the first primary winding, the second end of the MOS tube is used for being connected with the anode of the input power supply, and the control end of the MOS tube is used for being input with a control signal.
In a second aspect, embodiments of the present invention provide a power supply apparatus including the power supply circuit as described above.
The embodiment of the invention has the beneficial effects that: a power supply circuit and a power supply apparatus are provided. The power supply circuit comprises an energy storage inductor, a first switching tube, a second switching tube, a current transformer and a sampling processing circuit, wherein the current transformer comprises a first primary winding, a second primary winding and a secondary winding, the first primary winding is connected with the first switching tube in series to form a first current loop of the energy storage inductor, the second primary winding is connected with the second switching tube in series to form a second current loop of the energy storage inductor, the first primary winding flows through a first current and the second primary winding flows through a second current in turn in one switching period, the magnetic flux reset of the current transformer is realized, and the sampling processing circuit obtains information of the first current flowing through the first primary winding and information of the second current flowing through the second primary winding through the secondary winding. Therefore, by the mode, the reliability of system operation can be ensured without adding an additional reset circuit, and the precision of sampling current can be improved.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of a power circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the power supply circuit of FIG. 1 based on a BOOST topology;
FIGS. 3 and 4 are schematic diagrams of the operating principle of the power supply circuit of FIG. 2;
FIG. 5 is a schematic diagram of the power supply circuit of FIG. 1 based on BUCK topology;
FIGS. 6 and 7 are schematic diagrams of the operating principle of the power supply circuit in FIG. 5;
FIG. 8 is a schematic diagram of the power supply circuit of FIG. 1 based on a BUCK-BOOST topology;
FIGS. 9 and 10 are schematic diagrams of the operating principle of the power supply circuit in FIG. 8;
FIG. 11 is a schematic diagram of a sample processing circuit provided in FIG. 1;
FIG. 12 is a schematic diagram of a sampled current waveform obtained by the sampling processing circuit of FIG. 11;
fig. 13 is a schematic diagram of an alternative sample processing circuit provided in fig. 1.
Detailed Description
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a power circuit 100 includes an energy storage inductor L1, a first switch tube S1, a second switch tube S2, a current transformer CT1, and a sampling processing circuit 10.
The current transformer CT1 includes a first primary winding Np1, a second primary winding Np2, and a secondary winding Ns1, wherein a first end (e.g., a dotted end) of the first primary winding Np1 and a first end (e.g., a different-name end) of the second primary winding Np2 are connected to one end of the energy storage inductor L1, a second end (e.g., a different-name end) of the first primary winding Np1 and the first switch tube S1 are connected in series in a first current loop of the energy storage inductor L1, and a second end (e.g., a dotted end) of the second primary winding Np2 and the second switch tube S2 are connected in series in a second current loop of the energy storage inductor L1.
The first switch tube S1 and the second switch tube S2 are alternately turned on in a preset switching period, and when the first switch tube S1 is turned on and the second switch tube S2 is turned off, the energy storage inductor L1 starts to store energy, and at the same time, a first current flows through the first primary winding Np1, and a first current loop of the energy storage inductor L1 provides a current circulation path for the first current; when the second switch tube S2 is turned on and the first switch tube S1 is turned off, the energy storage inductor L1 starts to release energy, and at the same time, a second current flows through the second primary winding Np2, and a second current loop of the energy storage inductor L1 provides a current circulation path for the second current. Thus, when the first switch tube S1 and the second switch tube S2 are alternately turned on in a switch cycle, the first primary winding Np1 passes through the first current and the second primary winding Np2 passes through the second current in turn in the switch cycle, so that the current transformer CT1 is excited in the positive direction and the negative direction in the switch cycle (for example, the first current passes through the first primary winding Np1 and is excited in the positive direction, and the second current passes through the second primary winding Np2 and is excited in the negative direction), and then the current transformer CT1 works in the three quadrants to realize reliable magnetic flux reset, thereby avoiding the problem of low current sampling accuracy caused by the fact that the current transformer CT1 cannot be reliably reset and the magnetic flux is saturated.
According to the electromagnetic induction principle, the secondary winding Ns1 can induce a first current flowing through the first primary winding Np1 and a second current flowing through the second primary winding Np2, so as to obtain an induced current.
The sampling processing circuit 10 is connected to the secondary winding Ns1, and can obtain information (for example, current amplitude and direction) of a first current flowing through the first primary winding Np1 and information (for example, current amplitude and direction) of a second current flowing through the second primary winding Np2 according to an induced current of the secondary winding Ns1, and can also obtain current information of the energy storage inductor L1, so that the system can perform corresponding control operation or protection operation according to the information of the first current, the information of the second current, and the current information of the energy storage inductor L1.
In this embodiment, the current transformer CT1 can perform magnetic flux reset by itself in the process of storing and releasing energy in the energy storage inductor L1, thereby ensuring the reliability of system operation, and simultaneously improving the sampling accuracy of the first current and the second current, and since it is not necessary to add an extra reset circuit to reset the current transformer CT1, the circuit structure can be greatly simplified.
The first switch tube S1 and the second switch tube S2 may be any electronic switch or semiconductor switch, such as a diode, a triode (Bipolar Transistor), a metal-oxide semiconductor field effect Transistor (MOS Transistor), an IGBT (Insulated Gate Bipolar Transistor), and so on. In some embodiments, the first switch tube S1 is a MOS tube, and the second switch tube S2 is a diode.
In some embodiments, the power circuit 100 is based on a BOOST topology, as shown in fig. 2, the power circuit 100 includes an energy storage inductor L1, a first output capacitor Co1, a MOS transistor Q1 (a first switch transistor S1), a diode D1 (a second switch transistor S2), a current transformer CT1, and the sampling processing circuit 10.
One end of a first output capacitor Co1 is connected with a cathode of a diode D1, an anode of a diode D1 is connected with a dotted end of a second primary winding Np1, the other end of the first output capacitor Co1 is connected with a cathode of an input power supply DC and a first end of an MOS tube Q1, a second end of the MOS tube Q1 is connected with a second end of the first primary winding Np1, a control end of the MOS tube Q1 is inputted with a control signal, one end of an energy storage inductor L1 is connected with the dotted end of the first primary winding Np1 and a dotted end of the second primary winding Np2, the dotted end of the first primary winding Np1 and the dotted end of the second primary winding Np2 form a primary center tap of a current transformer CT1, the other end of the energy storage inductor L1 is connected with an anode of the input power supply DC, and the sampling processing circuit 10 is connected with a secondary winding 1.
The MOS transistor Q1 may be an NMOS transistor or a PMOS transistor, and taking the MOS transistor Q1 as an NMOS transistor as an example, as shown in fig. 2, a first end of the MOS transistor Q1 is a source of the NMOS transistor, a second end of the MOS transistor Q1 is a drain of the NMOS transistor, and a control end of the MOS transistor Q1 is a gate of the NMOS transistor.
The MOS transistor Q1 and the diode D1 are alternately turned on in a high frequency switching period, and for one switching period, in the switching period: when the MOS transistor Q1 is on and the diode D1 is off, the first current i1The first current loop flowing through the energy storage inductor L1 is shown in FIG. 3, i1The current flows through the positive electrode of the input power DC, the energy storage inductor L1, the dotted end of the first primary winding Np1, the dotted end of the first primary winding Np1, the MOS tube Q1 and the negative electrode of the input power DC in sequence, at the moment, the energy storage inductor L1 stores energy, the inductive current of the energy storage inductor L1 rises, and the current transformer CT1 works in the first quadrant for positive excitation; when the diode D1 is turned on and the MOS transistor Q1 is turned off, the second current i2The second current i flows through the second current loop of the energy storage inductor L1 as shown in FIG. 42Sequentially flows through the positive electrode of the input power supply DC, the energy storage inductor L1, the synonym terminal of the second primary winding Np2, the homonymous terminal of the second primary winding Np2, the first output capacitor Co 1/load RL and the positive electrode of the input power supply DC, at the moment, the energy storage inductor L1 releases energy, and the inductive current of the energy storage inductor L1 decreasesAnd the current transformer CT1 works in the third quadrant for reverse excitation.
Therefore, in the process of storing and releasing energy by the energy storage inductor L1 in each switching period, the current transformer CT1 is excited in a positive and negative direction in a three-quadrant manner, so that the current transformer CT1 is ensured to be reset reliably, and the current sampling precision can be improved while the system reliability is improved.
In some embodiments, the power circuit 100 is based on a BUCK topology, as shown in fig. 5, the power circuit 100 includes an energy storage inductor L1, a second output capacitor Co2, a MOS transistor Q2 (a first switch transistor S1), a diode D2 (a second switch transistor S2), a current transformer CT1, and the sampling processing circuit 10.
One end of a second output capacitor Co2 is connected with one end of an energy storage inductor L1, the other end of the energy storage inductor L1, the synonym end of a first primary winding Np1 and the synonym end of a second primary winding Np2 are connected together, the other end of the second output capacitor Co2 is connected with the negative electrode of an input power supply DC and the anode of a diode D2, the cathode of the diode D2 is connected with the synonym end of the second primary winding Np2, the first end of a MOS transistor Q2 is connected with the second end of the first primary winding Np1, the second end of a MOS transistor Q1 is connected with the positive electrode of the input power supply DC, a control end of the MOS transistor Q1 is inputted with a control signal, and the sampling processing circuit 10 is connected with a secondary winding Ns 1.
The MOS transistor Q2 may be an NMOS transistor or a PMOS transistor, and taking the MOS transistor Q2 as an NMOS transistor as an example, as shown in fig. 3, a first end of the MOS transistor Q2 is a source of the NMOS transistor, a second end of the MOS transistor Q2 is a drain of the NMOS transistor, and a control end of the MOS transistor Q2 is a gate of the NMOS transistor.
The MOS transistor Q2 and the diode D2 are alternately turned on in a high frequency switching period, and for one switching period, in the switching period: when the MOS transistor Q2 is on and the diode D2 is off, the first current i1The first current loop flowing through the energy storage inductor L1 is shown in FIG. 6, i1The current sequentially flows through the positive electrode of the input power supply DC, the MOS transistor Q2, the dotted terminal of the first primary winding Np1, the synonym terminal of the first primary winding Np1, the energy storage inductor L1, the second output capacitor Co 2/load RL and the negative electrode of the input power supply DC, at the moment, the energy storage inductor L1 stores energy, the inductive current of the energy storage inductor L1 rises, and the currents mutually flowThe sensor CT1 works in the first quadrant positive excitation; when the diode D2 is turned on and the MOS transistor Q2 is turned off, the second current i2The second current i flows through the second current loop of the energy storage inductor L1 as shown in FIG. 72The current flows through the energy storage inductor L1, the second output capacitor Co 2/load RL, the diode D2, the synonym terminal of the second primary winding Np2 and the synonym terminal of the second primary winding Np2 in sequence, at the moment, the energy storage inductor L1 releases energy, the inductive current of the energy storage inductor L1 is reduced, and the current transformer CT1 works in the third quadrant for reverse excitation.
Therefore, in the process of storing and releasing energy by the energy storage inductor L1 in each switching period, the current transformer CT1 is excited in a positive and negative direction in a three-quadrant manner, so that the current transformer CT1 is ensured to be reset reliably, and the current sampling precision can be improved while the system reliability is improved.
In some embodiments, the power circuit 100 is based on a BUCK-BOOST topology, as shown in fig. 8, the power circuit 100 includes an energy storage inductor L1, a second output capacitor Co3, a MOS transistor Q3 (a first switch transistor S1), a diode D3 (a second switch transistor S2), a current transformer CT1, and the sampling processing circuit 10.
One end of a third output capacitor Co3 is connected with the anode of a diode D3, the cathode of a diode D3 is connected with the synonym end of a second primary winding Np2, the other end of the third output capacitor Co3 is connected with the cathode of an input power supply DC and one end of an energy storage inductor L1, the other end of an energy storage inductor L1, the synonym end of a first primary winding Np1 and the synonym end of a second primary winding Np2 are connected together, the first end of a MOS transistor Q3 is connected with the synonym end of the first primary winding Np1, the second end of a MOS transistor Q3 is connected with the anode of the input power supply DC, the control end of the MOS transistor Q3 is input with a control signal, and the sampling processing circuit 10 is connected with a secondary winding Ns 1.
The MOS transistor Q3 may be an NMOS transistor or a PMOS transistor, and taking the MOS transistor Q3 as an NMOS transistor as an example, as shown in fig. 8, a first end of the MOS transistor Q3 is a source of the NMOS transistor, a second end of the MOS transistor Q3 is a drain of the NMOS transistor, and a control end of the MOS transistor Q3 is a gate of the NMOS transistor.
The MOS transistor Q3 and the diode D3 are alternately turned on in a high frequency switching period, and for one switching period, in the switching period:when the MOS transistor Q3 is on and the diode D3 is off, the first current i1The first current loop flowing through the energy storage inductor L1 is shown in FIG. 9, i1The current sequentially flows through the positive electrode of the input power supply DC, the MOS tube Q3, the dotted end of the first primary winding Np1, the synonym end of the first primary winding Np1, the energy storage inductor L1 and the negative electrode of the input power supply DC, at the moment, the energy storage inductor L1 stores energy, the inductive current of the energy storage inductor L1 rises, and the first quadrant of the current transformer CT1 is excited in the positive direction; when the diode D3 is turned on and the MOS transistor Q3 is turned off, the second current i2The second current i flows through the second current loop of the energy storage inductor L1 as shown in FIG. 102The current flows through the energy storage inductor L1, the load RL, the diode D3, the different-name end of the second primary winding Np2 and the same-name end of the second primary winding Np2 in sequence, at the moment, the energy storage inductor L1 releases energy, the inductive current of the energy storage inductor L1 decreases, and the current transformer CT1 performs reverse excitation in the third quadrant.
Therefore, in the process of storing and releasing energy by the energy storage inductor L1 in each switching period, the current transformer CT1 is excited in a positive and negative direction in a three-quadrant manner, so that the current transformer CT1 is ensured to be reset reliably, and the current sampling precision can be improved while the system reliability is improved.
It is understood that under the teachings of the above-described embodiments of the present invention, the power circuit 100 may be based on any other suitable topology and achieve accurate current sampling, e.g., based on a full-bridge circuit, a half-bridge circuit, a totem-pole bridgeless PFC, and so on, without departing from the purpose and spirit of the present invention.
At a first current i1Flows through the first primary winding Np1 and a second current i2When the current flows through the second primary winding Np2, the secondary winding Ns1 can induce a current, which is the first current i1Or the second current i2The current obtained by the conversion of the turn ratio is used, and the sampling processing circuit 10 can obtain the first current i flowing through the first primary winding Np1 according to the current induced by the secondary winding Ns11And a second current i flowing through the second primary winding Np22The information of (1).
Specifically, in some embodiments, as shown in fig. 11, the sample processing circuit 10 includes a conditioning circuit 11 and a controller 12.
The conditioning circuit 11 is connected with the secondary winding Ns1, and can obtain a sampling voltage according to the current induced by the secondary winding Ns 1.
The controller 12 is connected with the conditioning circuit 11, and can obtain a first current i according to the sampling voltage1And the second current i2The information of (1).
The controller 12 may be any general purpose processor, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), single chip, arm (acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller 12 may be any conventional processor, controller, microcontroller, or state machine. The controller 12 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP, and/or any other such configuration.
In some embodiments, with continued reference to fig. 11, the conditioning circuit 11 includes a preprocessing circuit 111 and an operational amplifier circuit 112.
The preprocessing circuit 111 is connected to the secondary winding Ns1, and converts the current induced in the secondary winding Ns1 into an induced voltage.
The operational amplifier circuit 112 is connected to the preprocessing circuit 111 and the controller 12, and can obtain a sampling voltage according to the induced voltage output by the preprocessing circuit 111 and output the sampling voltage to the controller 12.
Specifically, the preprocessing circuit 111 includes a first resistor R1 and a first capacitor C1, and the operational amplifier circuit 112 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2, and an operational amplifier a 1.
One end of a first resistor R1, one end of a first capacitor C1, one end of a second resistor R2, and the dotted end of the secondary winding Ns1 are commonly connected, the other end of the first resistor R1, the other end of the first capacitor C1, one end of a third resistor R3, and the dotted end of the secondary winding Ns1 are commonly connected, the other end of the second resistor R2 is connected to a reference voltage source Vref and a first input terminal of an operational amplifier a1, the other end of the third resistor R3, one end of a fourth resistor R4, a second input terminal of the operational amplifier a1, and one end of the second capacitor C2 are commonly connected, and an output terminal of the operational amplifier a1, the other end of the fourth resistor R4, and the other end of the second capacitor C2 are connected to the controller 12.
The first input terminal of the operational amplifier a1 may be a non-inverting input terminal or an inverting input terminal, and the second input terminal of the operational amplifier a1 may be a non-inverting input terminal or an inverting input terminal, it being understood that when the first input terminal of the operational amplifier a1 is a non-inverting input terminal, the second input terminal is a non-inverting input terminal, and when the first input terminal of the operational amplifier a1 is an inverting input terminal, the second input terminal is a non-inverting input terminal. In some embodiments, as shown in FIG. 11, the first input of the operational amplifier A1 is a non-inverting input and the second input is an inverting input.
In the present embodiment, the first current i1And a second current i2The current amplitude of the current transformer is converted to the secondary winding according to the turn ratio relation of the primary winding and the secondary winding of the current transformer CT1, so that the secondary winding obtains converted current, a first resistor R1 is connected between the dotted terminal and the dotted terminal of the secondary winding Ns1 to convert induction current (converted current) into induction voltage, a first capacitor C1 can stabilize the induction voltage, the induction voltage subjected to stabilization is input into an operational amplifier A1, the operational amplifier A1 obtains sampling voltage according to the induction voltage, the sampling voltage is output to a controller 12, and the controller 12 obtains a first current i according to the sampling voltage1And a second current i2Current magnitude information and direction information (as shown in fig. 7).
As can be seen from fig. 7, the first switch tube S1 and the second switch tube S2 alternately pass through the inductor current, the magnitudes of the currents are equal and opposite, and thus the magnetic flux in the electromagnetic transformer CT1 flows in the positive and negative directions, which ensures that the magnetic core in the electromagnetic transformer CT1 can be reliably reset. In FIG. 7, VS1Indicating the current, V, flowing through the first switching tube S1S2Indicating the current, V, flowing through the second switching tube S2L1Indicating flow through an energy storage inductor L1Current, -VL1Indicating the inverted current, V, of the energy storage inductor L1SIndicating the sampled voltage output by the conditioning circuit 11. Therefore, thanks to the positive and negative flow of magnetic flux in the electromagnetic transformer CT1, the magnetic core can be reliably reset in each switching cycle, and the sampling processing circuit 10 can accurately sample the amplitude information and the direction information of the first current flowing through the first primary winding Np1 and the amplitude information and the direction information of the second current flowing through the second primary winding Np2 through the secondary winding Ns 1.
The conditioning circuit 11 can also obtain the sampling voltage according to the current induced by the secondary winding Ns1 in any other form. In some embodiments, as shown in fig. 13, the conditioning circuit 11 includes a fifth resistor R5, a sixth resistor R6, and a third capacitor C3.
One end of the fifth resistor R5 is connected to the dotted end of the secondary winding Ns1, the other end of the fifth resistor R5, one end of the sixth resistor R6, and one end of the third capacitor C3 are connected to the controller 12, and the other end of the sixth resistor R6, the other end of the third capacitor C3, and the dotted end of the secondary winding Ns1 are grounded.
As another aspect of the embodiments of the present invention, the embodiments of the present invention further provide a power supply apparatus including the power supply circuit 100 as described above, for example, the power supply circuit 100 shown in fig. 3, fig. 4, or fig. 5.
Finally, it is to be understood that the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present disclosure, and which are provided for the purpose of providing a more thorough understanding of the present disclosure. In the light of the above, the above features are combined with each other and many other variations of the different aspects of the invention described above are considered to be within the scope of the present description; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A power supply circuit is characterized by comprising an energy storage inductor, a first switch tube, a second switch tube, a current transformer and a sampling processing circuit;
the current transformer comprises a first primary winding, a second primary winding and a secondary winding, wherein a first end of the first primary winding and a first end of the second primary winding are connected with one end of an energy storage inductor, a second end of the first primary winding and a first switch tube are connected in series in a first current loop of the energy storage inductor, a second end of the second primary winding and a second switch tube are connected in series in a second current loop of the energy storage inductor, when the first switch tube is conducted, the energy storage inductor stores energy, the first primary winding and the first switch tube flow first current, when the second switch tube is conducted, the energy storage inductor releases energy, the second primary winding and the second switch tube flow second current, and the first switch tube and the second switch tube are conducted alternately in a preset switch period, the first current flowing through the first primary winding and the second current flowing through the second primary winding are conducted in turn in the preset switching period, and the secondary winding is used for inducing the first current flowing through the first primary winding and the second current flowing through the second primary winding to obtain an induced current;
the sampling processing circuit is connected with the secondary winding and used for obtaining information of a first current flowing through the first primary winding and information of a second current flowing through the second primary winding according to the induced current of the secondary winding.
2. The power supply circuit of claim 1, wherein the sampling processing circuit comprises a conditioning circuit and a controller;
the conditioning circuit is connected with the secondary winding and used for obtaining sampling voltage according to the induced current;
the controller is connected with the conditioning circuit and used for obtaining the information of the first current or the information of the second current according to the sampling voltage.
3. The power supply circuit of claim 2, wherein the conditioning circuit comprises a preprocessing circuit and an operational amplifier circuit;
the preprocessing voltage is connected with the secondary winding and used for converting the induced current of the secondary winding into induced voltage;
the operational amplification circuit is respectively connected with the preprocessing circuit and the controller and used for obtaining sampling voltage according to the induction voltage and outputting the sampling voltage to the controller.
4. The power supply circuit according to claim 3,
the preprocessing circuit comprises a first resistor and a first capacitor;
the operational amplification circuit comprises a second resistor, a third resistor, a fourth resistor, a second capacitor and an operational amplifier;
the one end of first resistance, the one end of first electric capacity, the one end of second resistance and the first end of secondary winding are connected jointly, the other end of first resistance, the other end of first electric capacity, the one end of third resistance and the second end of secondary winding are connected jointly, the other end of second resistance is used for with reference voltage source and the first input of operational amplifier is connected, the other end of third resistance, the one end of fourth resistance, the second input of operational amplifier and the one end of second electric capacity are connected jointly, the output of operational amplifier, the other end of fourth resistance and the other end of second electric capacity with the controller is connected.
5. The power supply circuit of claim 2, wherein the conditioning circuit comprises a fifth resistor, a sixth resistor, and a third capacitor;
one end of the fifth resistor is connected with the first end of the secondary winding, the other end of the fifth resistor, one end of the sixth resistor and one end of the third capacitor are connected with the controller, and the other end of the sixth resistor, the other end of the third capacitor and the second end of the secondary winding are grounded together.
6. The power supply circuit according to any one of claims 1 to 5, wherein the first switching transistor is a MOS transistor, and the second switching transistor is a diode.
7. The power supply circuit of claim 6, further comprising a first output capacitor;
one end of the first output capacitor is connected with the cathode of the diode, the anode of the diode is connected with the second end of the second primary winding, the other end of the first output capacitor is used for being connected with the negative electrode of the input power supply and the first end of the MOS tube, the second end of the MOS tube is connected with the second end of the first primary winding, the control end of the MOS tube is used for being input with a control signal, one end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, and the other end of the energy storage inductor is used for being connected with the anode of the input power supply.
8. The power supply circuit of claim 6, further comprising a second output capacitor;
one end of the second output capacitor is connected with one end of the energy storage inductor, the other end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, the other end of the second output capacitor is used for being connected with the negative electrode of the input power supply and the anode of the diode, the cathode of the diode is connected with the second end of the second primary winding, the first end of the MOS tube is connected with the first end of the first primary winding, the second end of the MOS tube is used for being connected with the positive electrode of the input power supply, and the control end of the MOS tube is used for being inputted with a control signal.
9. The power supply circuit of claim 6, further comprising a third output capacitor;
one end of the third output capacitor is connected with the anode of the diode, the cathode of the diode is connected with the second end of the second primary winding, the other end of the third output capacitor is used for being connected with the negative electrode of the input power supply and one end of the energy storage inductor, the other end of the energy storage inductor, the first end of the first primary winding and the first end of the second primary winding are connected together, the first end of the MOS tube is connected with the second end of the first primary winding, the second end of the MOS tube is used for being connected with the anode of the input power supply, and the control end of the MOS tube is used for being input with a control signal.
10. A power supply device characterized by comprising a power supply circuit according to any one of claims 1 to 9.
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| CN202110347882.9A CN113162421A (en) | 2021-03-31 | 2021-03-31 | Power supply circuit and power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110347882.9A CN113162421A (en) | 2021-03-31 | 2021-03-31 | Power supply circuit and power supply equipment |
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| CN202110347882.9A Pending CN113162421A (en) | 2021-03-31 | 2021-03-31 | Power supply circuit and power supply equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113992033A (en) * | 2021-10-29 | 2022-01-28 | 京东方科技集团股份有限公司 | Drive circuit, light control glass and motor |
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