CN111162660A - Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit - Google Patents

Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit Download PDF

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Publication number
CN111162660A
CN111162660A CN202010020192.8A CN202010020192A CN111162660A CN 111162660 A CN111162660 A CN 111162660A CN 202010020192 A CN202010020192 A CN 202010020192A CN 111162660 A CN111162660 A CN 111162660A
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output
circuit
sum
switch tube
group
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毛昭祺
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Priority to CN202010020192.8A priority Critical patent/CN111162660A/en
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Priority to PCT/CN2020/096931 priority patent/WO2021139093A1/en
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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
    • H02M1/00—Details of apparatus for conversion
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The embodiment of the application discloses a multichannel resonance converting circuit and a multichannel output control method based on the multichannel resonance converting circuit, wherein a control circuit in the circuit is used for controlling the working frequency of a first switch tube and the working frequency of a second switch tube, so that the sum of first electric signals output by a first output end and the sum of second electric signals output by a second output end is equal to the total value of preset electric signals, and the control circuit is also used for controlling the duty ratio data of the first switch tube and the duty ratio data of the second switch tube, so that the ratio of the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end is equal to the ratio of the preset electric signals. The working frequency of the first switch tube and the working frequency of the second switch tube are controlled by the control circuit, so that the first output end and the second output end output electric signals constantly according to the preset ratio, the total value of the output electric signals is equal to the total value of the preset electric signals, and the technical effect of simultaneous multi-path output of the same driver can be achieved.

Description

Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit
Technical Field
The invention relates to the field of resonant converters, in particular to a multi-channel resonant conversion circuit and a multi-channel output control method based on the multi-channel resonant conversion circuit.
Background
Light-Emitting Diode (LED) products have the advantages of energy saving, environmental protection, long service life, high conversion rate, and the like, and are widely used in the field of illumination. The LED converter converts the input alternating current into direct current to supply to an LED load. The LED converters on the market mainly have two types, one is an LED driver outputting a constant current, and the other is an LED driver outputting a constant voltage.
At present, the design requirements for the LED driver are more and more strict, and the size of the driver needs to be reduced on the premise of ensuring the working efficiency of the LED driver. Therefore, in order to meet the requirement of miniaturization of the driver, a resonant converter is added in the circuit design of the LED driver, and the resonant soft switching technology is utilized to reduce the loss of the switching tube and improve the switching frequency of the switching tube. In some lighting occasions, the same driver is required to be used for simultaneously driving two or more loads, in the prior art, a plurality of non-isolated direct current conversion circuits are added at the rear stage of a resonant converter so as to be used for simultaneously driving two or more loads by using the same driver, and although the method can realize multi-path output, the circuit is complex and the design cost is high.
Disclosure of Invention
The embodiment of the application provides a multichannel resonance converting circuit, wherein, the circuit includes: the circuit comprises a first switching tube, a second switching tube, a resonant circuit, a transformer, at least one output circuit group and a control circuit;
the first switch tube is connected with the second switch tube, and the first switch tube and the second switch tube are both connected with the resonant circuit;
the transformer comprises a primary winding and at least one secondary winding pair, the primary winding is connected with the resonant circuit, and the at least one secondary winding pair is connected with at least one output circuit group;
each of the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal;
the third output end is connected with the control circuit;
the control circuit is respectively connected with the first switch tube and the second switch tube, the control circuit is used for controlling the working frequency of the first switch tube and the working frequency of the second switch tube, the sum of a first electric signal output by the first output end and a second electric signal output by the second output end is equal to a preset electric signal total value, the control circuit is also used for controlling the duty ratio data of the first switch tube and the duty ratio data of the second switch tube, and the ratio of the sum of the first electric signal output by the first output end to the sum of the second electric signal output by the second output end is equal to a preset electric signal ratio.
Further, the control circuit includes: the circuit comprises a drive generation circuit, a voltage-controlled oscillation circuit, a duty ratio control circuit and an operational amplification circuit;
the operational amplification circuit is connected with the voltage-controlled oscillation circuit and is used for determining a feedback electric signal according to the difference between the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end and the total value of the preset electric signals;
the voltage-controlled oscillation circuit is connected with the drive generation circuit and is used for generating a frequency control signal according to the feedback electric signal;
the driving generation circuit is used for controlling the working frequency of the first switching tube and the working frequency of the second switching tube according to the frequency control signal;
the duty ratio control circuit is connected with the drive generation circuit and is used for generating a duty ratio control signal;
the drive generation circuit is also used for controlling duty ratio data of the first switch tube and duty ratio data of the second switch tube according to the duty ratio control signal, and further controlling the ratio of the sum of the first electric signals output by the first output end to the sum of the second electric signals output by the second output end, so that the ratio is equal to the preset electric signal ratio.
Further, the resonant circuit comprises an inductance and a capacitance;
the second end of the first switch tube or the first end of the second switch tube is connected with the inductor, the primary winding, the capacitor and the second end of the second switch tube in sequence to form a half-bridge circuit.
Further, each secondary winding pair of the at least one secondary winding pair comprises a first secondary winding and a second secondary winding;
each output circuit group in the at least one output circuit group comprises a first half-wave rectifying circuit and a second half-wave rectifying circuit, the first half-wave rectifying circuit is connected with the first secondary winding, and the second half-wave rectifying circuit is connected with the second secondary winding;
the positive end of the first half-wave rectifying circuit is a first output end, the positive end of the second half-wave rectifying circuit is a second output end, the negative end of the first half-wave rectifying circuit is connected with the negative end of the second half-wave rectifying circuit and grounded, and the negative end of the first half-wave rectifying circuit is connected with the negative end of the second half-wave rectifying circuit to lead out a third output end.
Furthermore, each output circuit group in the at least one output circuit group also comprises a detection resistor;
the first end of the detection resistor is connected with the negative end of the first half-wave rectifying circuit, the first end of the detection resistor is connected with the negative end of the second half-wave rectifying circuit, and the second end of the detection resistor is connected with the third output end.
Furthermore, the circuit comprises N output circuit groups, the transformer comprises N secondary winding pairs, and the N output circuit groups correspond to the N secondary winding pairs one by one; n is an integer greater than or equal to 2, and the N output circuit groups comprise N-1 adjacent output circuit groups and 2(N-1) shunt inductance groups.
Further, the shunt inductance group comprises a first shunt inductance and a second shunt inductance; the adjacent output circuit groups comprise a first output circuit group and a second output circuit group;
the first shunt inductor is positioned in the first half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is positioned in the first half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group; or; the first shunt inductor is positioned in the second half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is positioned in the second half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group.
Further, a ratio of a sum of the first electrical signals output by the first output end of each output circuit group in the at least one output circuit group to a sum of the second electrical signals output by the second output end of each output circuit group in the at least one output circuit group is equal to a preset electrical signal ratio.
Correspondingly, the embodiment of the application also provides a multi-channel output control method based on the multi-channel resonance transformation circuit, and the method comprises the following steps:
receiving the sum of first electric signals output by the first output end of each output circuit group in at least one output circuit group and the sum of second electric signals output by the second output end of each output circuit group;
determining a total value of the electrical signals from the sum of the first electrical signals and the sum of the second electrical signals;
and adjusting the working frequency of the first switch tube and the working frequency of the second switch tube according to the difference value between the total value of the electric signals and the preset total value of the electric signals, so that the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end is equal to the preset total value of the electric signals.
Further, the method further comprises:
receiving a duty cycle control signal;
and adjusting the duty ratio data of the first switching tube and the duty ratio data of the second switching tube according to the duty ratio control signal, so that the ratio of the sum of the first electric signals output by the first output end to the sum of the second electric signals output by the second output end is equal to the preset ratio of the electric signals.
The embodiment of the application has the following beneficial effects:
the embodiment of the application discloses a multi-path resonance converting circuit and a multi-path output control method based on the multi-path resonance converting circuit, wherein the circuit comprises a first switching tube, a second switching tube, a resonance circuit, a transformer, at least one output circuit group and a control circuit, wherein the first switching tube is connected with the second switching tube, the first switching tube and the second switching tube are both connected with the resonance circuit, the transformer comprises a primary winding and at least one secondary winding pair, the primary winding is connected with the resonance circuit, the at least one secondary winding pair is connected with the at least one output circuit group, each output circuit group in the at least one output circuit group is provided with a first output end, a second output end and a third output end, the third output end is connected with the control circuit, the control circuit is respectively connected with the first switching tube and the second switching tube, the control circuit is used for controlling the working frequency of the first switching tube and the working frequency of the second switching tube, the sum of the first electric signal sum output by the first output end and the second electric signal sum output by the second output end is equal to the preset electric signal total value, and the control circuit is further used for controlling the duty ratio data of the first switch tube and the duty ratio data of the second switch tube, so that the ratio of the first electric signal sum output by the first output end to the second electric signal sum output by the second output end is equal to the preset electric signal ratio. Based on this application embodiment, through the operating frequency of control circuit control first switch tube and second switch tube for first output and second output are according to the invariable output signal of telecommunication of predetermined ratio, and the total value of the output signal of telecommunication equals with the total value of predetermined signal of telecommunication, can realize the technological effect of same driver simultaneous multiplexed output.
Drawings
In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic circuit diagram of a multi-channel resonant converter circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a multi-channel resonant conversion circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a multi-channel resonant converting circuit according to an embodiment of the present disclosure;
fig. 4 is a partial waveform diagram illustrating duty cycle data D1 of a first switching tube and duty cycle data D2 of a second switching tube according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a multi-resonance converting circuit according to an embodiment of the present application;
fig. 6 is a partial waveform diagram illustrating duty cycle data D1 of a first switching tube and duty cycle data D2 of a second switching tube according to an embodiment of the present application;
fig. 7 is a flowchart illustrating a method for controlling multiple outputs according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. It should be apparent that the described embodiment is only one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An "embodiment" as referred to herein relates to a particular feature, structure, or characteristic that may be included in at least one implementation of the present application. In the description of the embodiments of the present application, it should be understood that 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 or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than described or illustrated herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a circuit or method that comprises a list of steps or devices is not necessarily limited to those steps or devices expressly listed, but may include other steps or devices not expressly listed or inherent to such circuit or method.
Referring to fig. 1, which is a schematic circuit diagram of a multi-channel resonant converter circuit provided in an embodiment of the present application, the circuit shown in the drawing includes a first switch tube 1, a second switch tube 2, a resonant circuit 3, a transformer 4, at least one output circuit group 5, and a control circuit 6, where the first switch tube 1 is connected to the second switch tube 2, the first switch tube 1 and the second switch tube 2 are both connected to the resonant circuit 3, the transformer 4 includes a primary winding 41 and at least one secondary winding group 42, the primary winding 41 is connected to the resonant circuit 3, the at least one secondary winding group 42 is connected to the at least one output circuit group 5, each output circuit group in the at least one output circuit group 5 has a first output end 51, a second output end 52, and a third output end 53, the third output end 53 is connected to the control circuit 6, the control circuit 6 is respectively connected to the first switch tube 1 and the second switch tube 2, the control circuit 6 is used for controlling the working frequency of the first switch tube 1 and the working frequency of the second switch tube 2, so that the sum of the first electric signals output by the first output end 51 and the sum of the second electric signals output by the second output end 52 is equal to a preset electric signal total value, and the control circuit 6 is also used for controlling the duty ratio data of the first switch tube 1 and the duty ratio data of the second switch tube 2, so that the ratio of the sum of the first electric signals output by the first output end 51 to the sum of the second electric signals output by the second output end 52 is equal to a preset electric signal ratio value.
By adopting the multi-channel resonance conversion circuit provided by the embodiment of the application, the working frequency of the first switch tube and the working frequency of the second switch tube are controlled by the control circuit, so that the first output end and the second output end output electric signals constantly according to the preset ratio, the total value of the output electric signals is equal to the total value of the preset electric signals, and the technical effect of simultaneous multi-channel output of the same driver can be realized.
An embodiment of the multi-resonant conversion circuit is described below based on the circuit schematic diagram of the multi-resonant conversion circuit provided in fig. 1. Specifically, fig. 2 is a schematic circuit diagram of a multi-resonance converting circuit according to an embodiment of the present disclosure. The transformer comprises a first switch tube 1, a second switch tube 2, a resonant circuit 3, a transformer 4, at least one output circuit group 5 and a control circuit 6, wherein the first switch tube 1 is connected with the second switch tube 2, the first switch tube 1 and the second switch tube 2 are both connected with the resonant circuit 3, the transformer 4 comprises a primary winding 41 and at least one secondary winding group 42, the primary winding 41 is connected with the resonant circuit 3, the at least one secondary winding group 42 is connected with the at least one output circuit group 5, each output circuit group in the at least one output circuit group 5 is provided with a first output end 51, a second output end 52 and a third output end 53, the third output end 53 is connected with the control circuit 6, the control circuit 6 is respectively connected with the first switch tube 1 and the second switch tube 2, the control circuit 6 is used for controlling the working frequency of the first switch tube 1 and the working frequency of the second switch tube 2, the sum of the first electric signals output by the first output end 51 and the sum of the second electric signals output by the second output end 52 can be constantly output, the sum of the first electric signals output by the first output end 51 and the sum of the second electric signals output by the second output end 52 is equal to a preset electric signal total value, and the control circuit 6 is further used for controlling the duty ratio data of the first switching tube 1 and the duty ratio data of the second switching tube 2, so that the ratio of the sum of the first electric signals output by the first output end 51 to the sum of the second electric signals output by the second output end 52 is equal to a preset electric signal ratio value.
In the embodiment of the present application, the control circuit 6 includes a driving generation circuit 61, a voltage-controlled oscillation circuit 62, a duty ratio control circuit 63 and an operational amplification circuit 64, wherein the operational amplification circuit 64 is connected to the voltage-controlled oscillation circuit 62, the operational amplification circuit 64 is configured to determine a feedback electrical signal according to a difference between a sum of a first electrical signal output by the first output terminal 51 and a sum of a second electrical signal output by the second output terminal 52 and a total value of a preset electrical signal, the voltage-controlled oscillation circuit 62 is connected to the driving generation circuit 61, the voltage-controlled oscillation circuit 62 is configured to generate a frequency control signal according to the feedback electrical signal, the driving generation circuit 61 is configured to control an operating frequency of the first switch tube 1 and an operating frequency of the second switch tube 2 according to the frequency control signal, the duty ratio control circuit 63 is connected to the driving generation circuit 61, the duty ratio control circuit 63 is, the driving generation circuit is further configured to control duty cycle data of the first switching tube 1 and duty cycle data of the second switching tube 2 according to the duty cycle control signal, and further control a ratio of a sum of the first electrical signals output by the first output end 51 to a sum of the second electrical signals output by the second output end 52, so that the ratio is equal to a preset electrical signal ratio.
Specifically, the control circuit 6 detects the total current value output by the first output terminal 51 and the second output terminal 52, compares the total current value with the preset electric signal total value, i.e. compares the total current value with the expected value VrefAnd comparing, the operational amplifier circuit 64 determines a feedback electrical signal according to the difference between the total current value and the expected value, the feedback electrical signal is input into the voltage-controlled oscillation circuit 62, and the voltage-controlled oscillation circuit 62 generates a frequency control signal according to the feedback electrical signal, so that the working frequency of the first switch tube 1 and the working frequency of the second switch tube 2 change along with the change of the feedback electrical signal, and further the total current is equal to the expected value.
The operating frequency of the first switch tube 1 is equal to the operating frequency of the second switch tube 2, and the voltage-controlled oscillation circuit 62 determines the operating frequency of the first switch tube 1 and the operating frequency of the second switch tube 2 according to the feedback electrical signal.
In the embodiment of the present application, the resonant circuit 3 includes an inductor 31 and a capacitor 32, the inductor 31 is connected in series with the capacitor 32 and is connected in series with a primary winding 41 of the transformer 4, specifically, the second end 11 of the first switching tube 1 is connected to the first end 21 of the second switching tube 2, and the first end 21 of the second switching tube 2, the inductor 31, the primary winding 41, the capacitor 32 and the second end 22 of the second switching tube 2 are sequentially connected to form a half-bridge circuit.
In the embodiment of the present application, each of the at least one secondary winding pair 42 described above includes the first secondary winding and the second secondary winding, and each of the at least one output circuit group 5 described above includes the first half-wave rectifier circuit and the second half-wave rectifier circuit. The first half-wave rectifier circuit is connected with the first secondary winding, the second half-wave rectifier circuit is connected with the second secondary winding, the positive end of the first half-wave rectifier circuit is a first output end 51, the positive end of the second half-wave rectifier circuit is a second output end 52, the negative end of the first half-wave rectifier circuit is connected with the negative end of the second half-wave rectifier circuit, the grounding is a common ground end, and the negative end of the first half-wave rectifier circuit is connected with the negative end of the second half-wave rectifier circuit to lead out a common negative end, namely a third output end 53. In addition, each of the at least one output circuit group 5 described above further includes a detection resistor 54, a first end of the detection resistor 54 is connected to the common ground, and a second end of the detection resistor 54 is connected to the common negative terminal, so that the voltage across the detection resistor 54 is a voltage drop between the common negative terminal and the common ground, and the magnitude of the voltage drop represents the magnitude of the sum of the first electrical signals output by the first output terminal and the sum of the second electrical signals output by the second output terminal.
In this embodiment, the multi-channel resonant conversion circuit includes at least one output circuit group 5, which may specifically be a circuit including N output circuit groups 5, the transformer 4 includes at least one secondary winding pair 42, which may specifically be a circuit including N secondary winding pairs 42, and the N output circuit groups 5 correspond to the N secondary winding pairs 42 one to one; n is an integer greater than or equal to 2, and the N output circuit groups 5 comprise N-1 adjacent output circuit groups and 2(N-1) shunt inductance groups. Each shunt inductance group in the 2(N-1) shunt inductance groups comprises a first shunt inductance and a second shunt inductance, the adjacent output circuit groups comprise a first output circuit group and a second output circuit group, the first shunt inductance is positioned in a first half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductance group, and the second shunt inductance is positioned in a first half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductance group; or; the first shunt inductor is positioned in the second half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is positioned in the second half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group.
In the embodiment of the present application, the ratio of the sum of the first electrical signals output by the first output terminal 51 of each of the at least one output circuit group 5 to the sum of the second electrical signals output by the second output terminal 51 of each of the at least one output circuit group 5 described above is equal to the preset electrical signal ratio.
It should be noted that, in the embodiment of the present application, the circuit includes at least one output circuit group 5, where at least one output circuit group 5 may include one output circuit group 5, or may include a plurality of output circuit groups 5; the transformer 4 includes a primary winding 41 and at least one secondary winding pair 42, wherein the at least one secondary winding pair 42 may include one secondary winding pair 42 or a plurality of secondary winding pairs 42. The number of the output circuit groups 5 is the same as the number of the secondary winding pairs 42, and the output circuits in the output circuits 5 correspond to the secondary windings in the secondary winding pairs one by one. Several alternative embodiments are described in detail below.
In an alternative implementation, as shown in fig. 3, a circuit diagram of a multi-resonance converting circuit according to an embodiment of the present application is shown. The circuit comprises a set of output circuits 5 and the transformer 4 comprises a primary winding 41 and a secondary winding pair 42. The output circuit group 5 comprises a first half-wave rectifying circuit and a second half-wave rectifying circuit, the secondary winding group 42 comprises a first secondary winding and a second secondary winding, the first half-wave rectifying circuit is connected with the first secondary winding, the second half-wave rectifying circuit is connected with the second secondary winding, the positive end of the first half-wave rectifying circuit is a first output end 51, and the first output end 51 is marked as V01; the positive terminal of the second half-wave rectifier circuit is the second output terminal 52, and the second output terminal 52 is marked as V02; the negative terminal of the first half-wave rectifier circuit is connected with the negative terminal of the second half-wave rectifier circuit, and a third output terminal 53 is led out, the third output terminal 53 is marked as V1-.
The operational amplifier circuit in the control circuit 6 determines a feedback electrical signal according to a difference between a sum of a first electrical signal output by the first output terminal 51 and a second electrical signal output by the second output terminal 52 and a preset total value of the electrical signals, that is, a difference between a voltage across the detection resistor 54 and a desired value, the feedback electrical signal is input to the voltage-controlled oscillation circuit 62, the voltage-controlled oscillation circuit 62 generates a frequency control signal according to the feedback electrical signal and inputs the frequency control signal to the driving generation circuit 61, and the driving generation circuit 61 controls the operating frequency of the first switch tube 1 and the operating frequency of the second switch tube 2 according to the frequency control signal, so that the sum of the electrical signal output by the first output terminal 51 and the electrical signal output by the second output terminal 52 is equal. In addition, the driving generation circuit adjusts duty ratio data of the first switching tube 1 and duty ratio data of the second switching tube 2 according to a duty ratio control signal provided by the duty ratio control circuit, so that the ratio of the first electrical signal output by the first output end 51 to the second electrical signal output by the second output end 52 is equal to the preset electrical signal ratio.
Specifically, the preset total current is 1A, the preset current ratio is I01: I02: 3:1, and the sum of the duty ratio data D1 of the first switching tube and the duty ratio data D2 of the second switching tube is 1. The control circuit 6 adjusts the operating frequency of the first switch tube 1 and the operating frequency of the second switch tube 2 according to the frequency control signal, so that the current value I01 output by the first output end 51 and the current value output by the second output end 52 are the sum I01+ I02 which is 1A of the I02, and adjusts the duty ratio data size of the first switch tube 1 and the duty ratio data size of the second switch tube 2, so that I01: I02 is 0.75: 0.25A which is 3: 1. The duty ratio data D1 of the first switch tube and the duty ratio data D2 of the second switch tube are shown in fig. 4, which is a partial waveform diagram of the duty ratio data D1 of the first switch tube and the duty ratio data D2 of the second switch tube.
In another alternative implementation, as shown in fig. 5, a circuit diagram of a multi-resonance converting circuit according to an embodiment of the present application is shown. The circuit comprises three output circuit sets 5 and the transformer 4 comprises one primary winding 41 and three secondary winding sets 42. Each of the three output circuit groups 5 includes a first half-wave rectifier circuit and a second half-wave rectifier circuit, and each of the three secondary winding pairs 42 includes a first secondary winding and a second secondary winding; the first half-wave rectifier circuit in each output circuit group 5 is connected to the first secondary winding in the corresponding pair of secondary windings, the second half-wave rectifier circuit in each output circuit group 5 is connected to the second secondary winding in the corresponding pair of secondary windings, the first output terminals 51 are designated V01, V03 and V05, respectively, and the second output terminals 52 are designated V02, V04 and V06, respectively. Wherein, V01 and V02 are marks of a first output end 51 and a second output end 52 of the same output circuit group, the negative end of a first half-wave rectifying circuit in the output circuit group is connected with the negative end of a second half-wave rectifying circuit, a third output end 53 is led out, and the mark of the third output end 53 is V1-; v03 and V04 are marks of a first output end 51 and a second output end 52 of the same output circuit group, the negative end of a first half-wave rectification circuit in the output circuit group is connected with the negative end of a second half-wave rectification circuit, a third output end 53 is led out, and the mark of the third output end 53 is V2-; v05 and V06 are the signs of the first output terminal 51 and the second output terminal 52 of the same output circuit group, the negative terminal of the first half-wave rectification circuit in the output circuit group is connected with the negative terminal of the second half-wave rectification circuit, and the third output terminal 53 is led out, and the sign of the third output terminal 53 is V3-.
The three output circuit groups 5 include two adjacent output circuit groups and four shunt inductor groups. Each of the four shunt inductance groups L1, L2, L3, and L4 includes a first shunt inductance and a second shunt inductance, specifically, a first shunt inductance L1-1 of the shunt inductance group L1 is located at the first output terminal V01, and a second shunt inductance L1-2 of the shunt inductance group L1 is located at the first output terminal V03; similarly, the first shunt inductor L2-1 of the shunt inductor group L2 is located at the second output terminal V02, and the second shunt inductor L2-2 of the shunt inductor group L2 is located at the second output terminal V04; a first shunt inductor L3-1 of the shunt inductor group L3 is positioned at a first output end V03, and a second shunt inductor L3-2 of the shunt inductor group L3 is positioned at a first output end V05; the first shunt inductor L4-1 of the shunt inductor group L4 is located at the second output end V04, and the second shunt inductor L4-2 of the shunt inductor group L4 is located at the second output end V06.
The operational amplifier circuit in the control circuit 6 determines a feedback electrical signal according to a difference between a sum of a first electrical signal output by the first output terminal 51 and a sum of a second electrical signal output by the second output terminal 52 and a preset total value of the electrical signals, that is, a difference between a voltage across the detection resistor 54 and a desired value, the feedback electrical signal is input to the voltage-controlled oscillation circuit 62, the voltage-controlled oscillation circuit 62 generates a frequency control signal according to the feedback electrical signal and inputs the frequency control signal to the driving generation circuit 61, and the driving generation circuit 61 controls the operating frequency of the first switching tube 1 and the operating frequency of the second switching tube 2 according to the frequency control signal, so that the sum of the electrical signals output by the first output terminal 51 and the sum of the electrical signals output by the second output terminal 52 are equal. In addition, the driving generation circuit 61 adjusts the duty ratio data of the first switching tube 1 and the duty ratio data of the second switching tube 2 according to the duty ratio control signal provided by the duty ratio control circuit, so that the ratio of the sum of the first electrical signals output by the first output end 51 to the sum of the second electrical signals output by the second output end 52 is equal to the preset electrical signal ratio.
Specifically, the preset total current is 1A, the preset current ratio is I01: I02 is 1:1, and the sum of the duty ratio data D1 of the first switching tube and the duty ratio data D2 of the second switching tube is 1. The control circuit 6 adjusts the operating frequency of the first switch tube 1 and the operating frequency of the second switch tube 2 according to the frequency control signal, so that the sum I01 of the current values output by the first output end 51 and the current value output by the second output end 52 are equal to 1A in terms of I02, and I01: I02 is equal to 0.5A: 1. The duty ratio data D1 of the first switch tube and the duty ratio data D2 of the second switch tube are shown in fig. 6 and 4, which are partial waveform diagrams of the duty ratio data D1 of the first switch tube and the duty ratio data D2 of the second switch tube.
The sum of the currents output by the first output terminal 51, I011+ I013+ I015, I01, and the sum of the currents output by the second output terminal 52, I022+ I024+ I026, I02. The ratio of the currents I011, I013, and I015 output from the first output terminal 51 is implemented by a shunt inductance connected in series between the output terminals of the output electrical signals V01, V03, and V05, for example, if I011: I013: I015 is 2:1:1, L1-1: L1-2 is 1:2, and L3-1: L3-2 is 1: 1.
By adopting the multi-path resonance converting circuit provided by the embodiment of the application, the circuit comprises a first switch tube, a second switch tube, a resonance circuit, a transformer, at least one output circuit group and a control circuit, wherein the first switch tube is connected with the second switch tube, the first switch tube and the second switch tube are both connected with the resonance circuit, the transformer comprises a primary winding and at least one secondary winding pair, the primary winding is connected with the resonance circuit, the at least one secondary winding pair is connected with the at least one output circuit group, each output circuit group in the at least one output circuit group is provided with a first output end, a second output end and a third output end, the third output end is connected with the control circuit, the control circuit is respectively connected with the first switch tube and the second switch tube, the control circuit is used for controlling the working frequency of the first switch tube and the working frequency of the second switch tube, and the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end is equal to the total value of the preset electric signals. Based on this application embodiment, through the operating frequency of control circuit control first switch tube and second switch tube for first output and second output are according to the invariable output signal of telecommunication of predetermined ratio, and the total value of the output signal of telecommunication equals with the total value of predetermined signal of telecommunication, can realize the technological effect of same driver simultaneous multiplexed output.
A specific embodiment of a multi-channel resonant conversion circuit-based multi-channel output control method is described below based on a multi-channel resonant conversion circuit provided in fig. 1, and fig. 7 is a schematic flow chart of a multi-channel output control method provided in an embodiment of the present application. The order of steps recited in the embodiments is only one of many possible orders of execution and does not represent the only order of execution, and in actual execution, the steps may be performed sequentially or in parallel as in the embodiments or methods shown in the figures (e.g., in the context of parallel processors or multi-threaded processing). As shown in detail in fig. 7.
The method is based on a multi-path resonant conversion circuit, the multi-path resonant conversion circuit comprises a first switch tube 1, a second switch tube 2, a resonant circuit 3, a transformer 4, at least one output circuit group 5 and a control circuit 6, wherein the first switch tube 1 is connected with the second switch tube 2, the first switch tube 1 and the second switch tube 2 are both connected with the resonant circuit 3, the transformer 4 comprises a primary winding 41 and at least one secondary winding group 42, the primary winding 41 is connected with the resonant circuit 3, the at least one secondary winding group 42 is connected with the at least one output circuit group 5, each output circuit group in the at least one output circuit group 5 is provided with a first output end 51, a second output end 52 and a third output end 53, the third output end 53 is connected with the control circuit 6, the control circuit 6 is respectively connected with the first switch tube 1 and the second switch tube 2, the control circuit 6 is used for controlling the working frequency of the first switch tube 1 and the working frequency of the second switch tube 2, the sum of the first electrical signal sum output by the first output end 51 and the second electrical signal sum output by the second output end 52 is equal to the preset electrical signal total value, and the control circuit 6 is further configured to control the duty cycle data of the first switching tube 1 and the duty cycle data of the second switching tube 2, so that the ratio of the sum of the first electrical signal sum output by the first output end 51 and the second electrical signal sum output by the second output end 52 is equal to the preset electrical signal ratio.
The method comprises the following steps:
s701: the sum of the first electrical signals output by the first output terminal 51 of each of the at least one output circuit group and the sum of the second electrical signals output by the second output terminal 52 of each of the at least one output circuit group are received.
S703: the total value of the electrical signals is determined from the sum of the first electrical signals and the sum of the second electrical signals.
S705: and adjusting the working frequency of the first switch tube and the working frequency of the second switch tube according to the difference value between the total value of the electric signals and the preset total value of the electric signals, so that the sum of the first electric signals output by the first output end 51 and the sum of the second electric signals output by the second output end 52 is equal to the preset total value of the electric signals.
In an embodiment of the present application, the method further includes:
receiving a duty cycle control signal;
and adjusting the duty ratio data of the first switching tube and the duty ratio data of the second switching tube according to the duty ratio control signal, so that the ratio of the sum of the first electric signals output by the first output end 51 to the sum of the second electric signals output by the second output end 52 is equal to the preset electric signal ratio.
The method and the circuit embodiments in the embodiments of the present application are based on the same application concept.
As can be seen from the above embodiments of the multi-channel resonant converting circuit or the multi-channel output control method based on the multi-channel resonant converting circuit provided in the present application, the circuit in the present application includes a first switching tube, a second switching tube, a resonant circuit, a transformer, at least one output circuit group and a control circuit, wherein the first switching tube is connected to the second switching tube, the first switching tube and the second switching tube are both connected to the resonant circuit, the transformer includes a primary winding and at least one secondary winding pair, the primary winding is connected to the resonant circuit, the at least one secondary winding pair is connected to the at least one output circuit group, each output circuit group in the at least one output circuit group has a first output end, a second output end and a third output end, the third output end is connected to the control circuit, the control circuit is respectively connected to the first switching tube and the second switching tube, the control circuit is used for controlling the operating frequency of the first switching tube and the operating frequency of the second switching tube, the sum of the first electrical signals output by the first output end and the sum of the second electrical signals output by the second output end is equal to the preset electrical signal total value, and the control circuit 6 is further configured to control the duty cycle data of the first switching tube 1 and the duty cycle data of the second switching tube 2, so that the ratio of the sum of the first electrical signals output by the first output end 51 to the sum of the second electrical signals output by the second output end 52 is equal to the preset electrical signal ratio. Based on this application embodiment, through the operating frequency of control circuit control first switch tube and second switch tube for first output and second output are according to the invariable output signal of telecommunication of predetermined ratio, and the total value of the output signal of telecommunication equals with the total value of predetermined signal of telecommunication, can realize the technological effect of same driver simultaneous multiplexed output.
In the present invention, unless otherwise expressly stated or limited, the terms "connected" and the like are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be noted that: the foregoing sequence of the embodiments of the present application is for description only and does not represent the superiority and inferiority of the embodiments, and the specific embodiments are described in the specification, and other embodiments are also within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in the order of execution in different embodiments and achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown or connected to enable the desired results to be achieved, and in some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A multi-resonant conversion circuit, comprising: the circuit comprises a first switching tube, a second switching tube, a resonant circuit, a transformer, at least one output circuit group and a control circuit;
the first switch tube is connected with the second switch tube, and the first switch tube and the second switch tube are both connected with the resonant circuit;
the transformer comprises a primary winding and at least one secondary winding pair, the primary winding is connected with the resonant circuit, and the at least one secondary winding pair is connected with the at least one output circuit group;
each of the at least one output circuit group has a first output terminal, a second output terminal, and a third output terminal;
the third output end is connected with the control circuit;
the control circuit is respectively connected with the first switch tube and the second switch tube, and is used for controlling the working frequency of the first switch tube and the working frequency of the second switch tube so that the sum of a first electric signal output by the first output end and a second electric signal output by the second output end is equal to a preset electric signal total value, and is also used for controlling the duty ratio data of the first switch tube and the duty ratio data of the second switch tube so that the ratio of the sum of the first electric signal output by the first output end and the sum of the second electric signal output by the second output end is equal to a preset electric signal ratio value.
2. The circuit of claim 1, wherein the control circuit comprises: the circuit comprises a drive generation circuit, a voltage-controlled oscillation circuit, a duty ratio control circuit and an operational amplification circuit;
the operational amplification circuit is connected with the voltage-controlled oscillation circuit and is used for determining a feedback electric signal according to the difference between the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end and the total value of the preset electric signals;
the voltage-controlled oscillation circuit is connected with the drive generation circuit and is used for generating a frequency control signal according to the feedback electric signal;
the drive generation circuit is used for controlling the working frequency of the first switching tube and the working frequency of the second switching tube according to the frequency control signal;
the duty ratio control circuit is connected with the drive generation circuit and is used for generating a duty ratio control signal;
the drive generation circuit is further configured to control duty cycle data of the first switching tube and duty cycle data of the second switching tube according to the duty cycle control signal, and further control a ratio of a sum of first electrical signals output by the first output end to a sum of second electrical signals output by the second output end, so that the ratio is equal to a preset electrical signal ratio.
3. The circuit of claim 1, wherein the resonant circuit comprises an inductance and a capacitance;
the second end of the first switching tube or the first end of the second switching tube is connected with the inductor, the primary winding, the capacitor and the second end of the second switching tube in sequence to form a half-bridge circuit.
4. The circuit of claim 1, wherein each secondary winding pair of the at least one secondary winding pair comprises a first secondary winding and a second secondary winding;
each output circuit group in the at least one output circuit group comprises a first half-wave rectifying circuit and a second half-wave rectifying circuit, the first half-wave rectifying circuit is connected with the first secondary winding, and the second half-wave rectifying circuit is connected with the second secondary winding;
the positive end of the first half-wave rectifying circuit is a first output end, the positive end of the second half-wave rectifying circuit is a second output end, the negative end of the first half-wave rectifying circuit is connected with the negative end of the second half-wave rectifying circuit and grounded, and the negative end of the first half-wave rectifying circuit is connected with the negative end of the second half-wave rectifying circuit to lead out a third output end.
5. The circuit of claim 4, wherein each of the at least one group of output circuits further comprises a sense resistor;
the first end of the detection resistor is connected with the negative end of the first half-wave rectification circuit, the first end of the detection resistor is connected with the negative end of the second half-wave rectification circuit, and the second end of the detection resistor is connected with the third output end.
6. The circuit of claim 1, wherein the circuit comprises N groups of output circuits, wherein the transformer comprises N pairs of secondary windings, and wherein the N groups of output circuits are in one-to-one correspondence with the N pairs of secondary windings; the N is an integer greater than or equal to 2, and the N output circuit groups comprise N-1 adjacent output circuit groups and 2(N-1) shunt inductance groups.
7. The circuit of claim 6, wherein the shunt inductance bank comprises a first shunt inductance and a second shunt inductance; the adjacent output circuit groups comprise a first output circuit group and a second output circuit group;
the first shunt inductor is positioned in the first half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is positioned in the first half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group; or; the first shunt inductor is positioned in the second half-wave rectification circuit of the first output circuit group of the adjacent output circuit group corresponding to the shunt inductor group, and the second shunt inductor is positioned in the second half-wave rectification circuit of the second output circuit group of the adjacent output circuit group corresponding to the shunt inductor group.
8. The circuit of claim 2, wherein a ratio of a sum of the first electrical signals output by the first output terminals of each of the at least one output circuit groups to a sum of the second electrical signals output by the second output terminals of each of the at least one output circuit groups is equal to the preset electrical signal ratio.
9. A multi-channel output control method based on a multi-channel resonance transformation circuit is characterized by comprising the following steps:
receiving the sum of first electric signals output by the first output end of each output circuit group in at least one output circuit group and the sum of second electric signals output by the second output end of each output circuit group;
determining a total value of the electrical signals from the sum of the first electrical signals and the sum of the second electrical signals;
and adjusting the working frequency of the first switch tube and the working frequency of the second switch tube according to the difference value between the total value of the electric signals and the preset total value of the electric signals, so that the sum of the first electric signals output by the first output end and the sum of the second electric signals output by the second output end is equal to the preset total value of the electric signals.
10. The method of claim 9, further comprising:
receiving a duty cycle control signal;
and adjusting the duty ratio data of the first switching tube and the duty ratio data of the second switching tube according to the duty ratio control signal, so that the ratio of the sum of the first electric signals output by the first output end to the sum of the second electric signals output by the second output end is equal to a preset electric signal ratio.
CN202010020192.8A 2020-01-08 2020-01-08 Multi-channel resonance conversion circuit and multi-channel output control method based on multi-channel resonance conversion circuit Pending CN111162660A (en)

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