CN217037070U - Bidirectional low-voltage large-current energy-saving feedback circuit - Google Patents

Bidirectional low-voltage large-current energy-saving feedback circuit Download PDF

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CN217037070U
CN217037070U CN202220895090.5U CN202220895090U CN217037070U CN 217037070 U CN217037070 U CN 217037070U CN 202220895090 U CN202220895090 U CN 202220895090U CN 217037070 U CN217037070 U CN 217037070U
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circuit
transistor
inductor
sub
transformer
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梁远文
艾攀红
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Shenzhen Jia Chuang Dt Science Co ltd
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Shenzhen Jia Chuang Dt Science Co ltd
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Abstract

The disclosure relates to a bidirectional low-voltage large-current energy-saving feedback circuit. The method comprises the following steps: the secondary side sub-circuit, the harmonic oscillator sub-circuit connected with the secondary side sub-circuit and the primary side sub-circuit connected with the harmonic oscillator sub-circuit; the harmonic oscillator circuit comprises a tap transformer, a resonance capacitor and a resonance inductor, wherein the first end of the resonance inductor is connected with the first end of the primary winding of the tap transformer, and the second end of the resonance inductor is constructed as the first connecting end of the harmonic oscillator circuit; the first end of the resonance capacitor is connected with the second end of the primary winding of the tap transformer, the second end of the resonance capacitor is constructed as the second connecting end of the harmonic oscillator circuit, and the first connecting end and the second connecting end of the harmonic oscillator circuit are respectively connected with the second connecting end of the primary winding of the tap transformerThe primary side sub-circuit is connected; the first end, the tapping end and the second end of the secondary winding of the tapping transformer are respectively connected with the secondary sub-circuit, and the secondary winding of the tapping transformer is tapped at the center. The voltage V of the MOS tube is reduceddsStress, and avoiding adding absorption circuit, so that the circuit structure is simple.

Description

Bidirectional low-voltage large-current energy-saving feedback circuit
Technical Field
The disclosure relates to the technical field of power electronics, in particular to a bidirectional low-voltage large-current energy-saving feedback circuit.
Background
In a related scenario, the bidirectional circuit shown in fig. 1, for example, achieves the functions of forward rectification and reverse inversion, although the range of input voltage of the circuit is wide, during the reverse inversion or forward rectification, the operation mode of the circuit is hard switch on operation, which results in the voltage V of the MOS transistordsThe stress is very large, and therefore, an absorption circuit (such as a passive or active absorption circuit) needs to be arranged to feed back the stress to the output bus, so as to achieve the function of protecting the MOS transistor, which results in a complex circuit structure.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a bidirectional low-voltage large-current energy-saving feedback circuit for solving the problem of complicated circuit structure of the bidirectional circuit.
The present disclosure provides a bidirectional low-voltage large-current energy-saving feedback circuit, which includes:
the secondary side sub-circuit, the harmonic oscillator circuit connected with the secondary side sub-circuit and the primary side sub-circuit connected with the harmonic oscillator circuit;
wherein the harmonic oscillator circuit comprises: tapped transformer T, resonant capacitor C1Resonant inductor L1Said resonant inductor L1Is connected to a first end of a primary winding of the tapped transformer T, the resonant inductor L1Is constructed as a first connection terminal of the resonator sub-circuit;
the resonant capacitor C1Is connected to the second end of the primary winding of the tapped transformer T, the resonant capacitor C1Is configured as a second connection terminal of the harmonic oscillator circuit, the first connection terminal and the second connection terminal of the harmonic oscillator circuit being connected to the primary side sub-circuit, respectively;
and a first end, a tapping end and a second end of a secondary winding of the tapping transformer T are respectively connected with the secondary sub-circuit, and the secondary winding of the tapping transformer T is tapped at the center.
In one embodiment, the resonant capacitor C1Is 27 nF.
In one embodiment, the resonant inductor L1Is 35 uH.
In one embodiment, the turn ratio of the primary winding to the secondary winding of the tapped transformer T is 30: 1:1, the magnetic core is PQ40/40, and the primary inductance Lp is 140 uH.
In one embodiment, the secondary side sub-circuit includes a first transistor Q1Second transistor Q2And a second inductance L2；
Wherein the second transistor Q2Is connected with a first end of a secondary winding of the tapped transformer T, and the second inductor L2Is connected with the tap end of the secondary winding of the tap transformer T, and the first transistor Q is connected to the tap end of the secondary winding of the tap transformer T1The collector of the transformer is connected with the second end of the secondary winding of the tapped transformer T;
the first transistor Q1And said second transistor Q2Is connected with the second inductor L2Is connected to the second terminal of the second inductor L, the second inductor L2Is configured as a positive terminal connected to the positive terminal of the dc power supply, the second inductance L2Is configured as a negative terminal connected to a negative electrode of the dc power supply.
In one embodiment, the primary side sub-circuit includes: third transistor Q3And a fourth transistor Q4A fifth transistor Q5And a sixth transistor Q6A seventh transistor Q7An eighth transistor Q8A ninth transistor Q9A tenth transistor Q10A second capacitor C2A third inductor L3And a fourth inductance L4；
Wherein the third transistor Q3And the fourth transistor Q4And the second capacitor C2And the seventh transistor Q7And the eighth transistor Q8Is connected with the collector of the collector;
the fifth transistor Q5And the sixth transistor Q6And the second capacitor C2And the ninth transistor Q9And the tenth transistor Q10The emitter of (3) is connected;
the third transistor Q3And the fifth transistor Q5Is connected with the second connection end of the harmonic oscillator circuit, and the fourth transistor Q4And the sixth transistor Q6After being connected, the collector is connected with the first connection end of the harmonic oscillator circuit;
the seventh transistor Q7And the ninth transistor Q9Is connected with the fourth inductor L4Is connected to the first terminal of the fourth inductor L4Is configured as a first connection terminal of the primary side sub-circuit;
the eighth transistor Q8And the tenth transistor Q10Is connected with the third inductor L3Is connected to the first terminal of the third inductor L3Is configured as a second connection of the primary sub-circuit.
The circuit comprises the following components in a harmonic oscillator circuit: the first end of the resonance inductor is connected with the first end of a primary winding of the tapped transformer, and the second end of the resonance inductor is constructed as the first connection end of the harmonic oscillator circuit; the first end of the resonance capacitor is connected with the second end of the primary winding of the tap transformer T, the second end of the resonance capacitor is constructed as the second connecting end of the harmonic oscillator circuit, and the first connecting end and the second connecting end of the harmonic oscillator circuit are respectively connected with the primary side sub circuit; the first end, the tapping end and the second end of the secondary winding of the tapped transformer are respectively connected with the first end, the tapping end and the second end of the secondary windingAnd the secondary winding of the tapped transformer is a center tap. Therefore, during forward rectification, the primary side of the tapped transformer is in full-bridge LLC, synchronous rectification is conducted on the secondary side, during reverse inversion, push-pull is conducted on the secondary side, the circuit works in an open-loop mode, series resonance is formed by the resonant capacitor, the resonant inductor and the leakage inductor of the tapped transformer, the magnitude and the mode of the pull load are controlled by a rear-stage inverter bridge, and meanwhile, synchronous rectification is conducted on the primary side, so that the voltage V of the MOS (metal oxide semiconductor) tube can be reduceddsStress is avoided, and an absorption circuit is avoided, so that the circuit structure is simple, and the working stability is high.
Drawings
FIG. 1 is a circuit diagram of a prior art bi-directional circuit;
fig. 2 is a circuit diagram of a bidirectional low-voltage large-current energy-saving feedback circuit according to an embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, embodiments accompanying the present disclosure are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to the bidirectional circuit in the related art shown in fig. 1, the duty ratio is greater than 50% during the operation process, which results in the start-up and shutdown processes, and a set of auxiliary windings need to be added to the inductor to release the current in the inductor, so that the circuit structure is extremely complex.
To this end, the present invention provides a bidirectional low-voltage large-current energy-saving feedback circuit, and fig. 2 is a circuit diagram of the bidirectional low-voltage large-current energy-saving feedback circuit according to an embodiment, as shown in fig. 2, the feedback circuit 100 includes:
the secondary side sub-circuit comprises a secondary side sub-circuit 101, a harmonic oscillator sub-circuit 102 connected with the secondary side sub-circuit, and a primary side sub-circuit 103 connected with the harmonic oscillator sub-circuit 102;
wherein the resonant sub-circuit 102 comprises: tapped transformer T, resonant capacitor C1Resonant inductor L1The resonant inductance L1Is connected to a first end of a primary winding of the tapped transformer T, the resonant inductor L1Is configured as a first connection terminal of the resonator sub-circuit 102;
the resonant capacitor C1Is connected to the second end of the primary winding of the tapped transformer T, the resonant capacitor C1Is configured as a second connection terminal of the resonator sub-circuit 102, the first connection terminal and the second connection terminal of the resonator sub-circuit 102 are respectively connected to the primary sub-circuit 103;
the first end, the tap end and the second end of the secondary winding of the tap transformer T are respectively connected with the secondary sub-circuit 101, and the secondary winding of the tap transformer T is a center tap.
On the basis of the above embodiment, the resonant capacitor C1Is 27 nF.
On the basis of the above embodiment, the resonant inductor L1Is 35 uH.
On the basis of the above embodiment, the turn ratio of the primary winding to the secondary winding of the tapped transformer T is 30: 1:1, the magnetic core is PQ40/40, and the primary inductance Lp is 140 uH.
On the basis of the above embodiment, the secondary side sub-circuit 101 includes the first transistor Q1Second transistor Q2And a second inductance L2；
Wherein the second transistor Q2Is connected with a first end of a secondary winding of the tapped transformer T, and the second inductor L2Is connected to the tap end of the secondary winding of said tap transformer T,the first transistor Q1The collector of the transformer is connected with the second end of the secondary winding of the tapped transformer T;
the first transistor Q1And the second transistor Q2Is connected with the second inductor L2Is connected to the second terminal of the second inductor L, the second inductor L2Is configured as a positive terminal connected to the positive terminal of the dc power supply, the second inductance L2Is configured as a negative terminal end, connected to the negative pole of the dc power source.
On the basis of the above embodiment, the primary side sub-circuit 103 includes: third transistor Q3A fourth transistor Q4A fifth transistor Q5And a sixth transistor Q6And a seventh transistor Q7An eighth transistor Q8A ninth transistor Q9A tenth transistor Q10A second capacitor C2A third inductor L3And a fourth inductance L4；
Wherein the third transistor Q3And the fourth transistor Q4And the second capacitor C2And the seventh transistor Q7And the eighth transistor Q8Is connected with the collector;
the fifth transistor Q5And the sixth transistor Q6And the second capacitor C2And the ninth transistor Q9And the tenth transistor Q10The emitter of (3) is connected;
the third transistor Q3And said fifth transistor Q5Is connected with the second connection end of the harmonic oscillator circuit 102, and the fourth transistor Q4And the sixth transistor Q6Is connected with the first connection terminal of the resonator circuit 102Connecting;
the seventh transistor Q7And the ninth transistor Q9Is connected with the fourth inductor L4Is connected to the first terminal of the fourth inductor L4Is configured as a first connection terminal of the primary side sub-circuit 103, connected to an alternating current power supply;
the eighth transistor Q8And the tenth transistor Q10Is connected with the third inductor L3Is connected to the first terminal of the third inductor L3Is configured as a second connection of the primary sub-circuit 103 to an ac power supply.
The output voltage of the feedback circuit is 12.5Vds, the output current is 160A, and the resonant frequency Fr is 150 KHz. The feedback circuit provided by the utility model is in a soft switching state in the rectifying and inverting processes, and the V of the MOS tubedsThe stress is small, and the efficiency is high.
When the feedback circuit is in forward rectification, the primary side of the tapped transformer is in full-bridge LLC, the secondary side of the tapped transformer is in synchronous rectification, and when the feedback circuit is in reverse inversion, the secondary side of the tapped transformer is push-pull, the circuit works in an open-loop mode, a resonance capacitor, a resonance inductor and a tapped transformer leakage inductor form series resonance, the magnitude and the mode of the pull load are controlled by a rear-stage inverter bridge, and meanwhile, the primary side is in synchronous rectification, so that the voltage V of an MOS (metal oxide semiconductor) transistor can be reduceddsStress is avoided, and an absorption circuit is avoided, so that the circuit structure is simple, and the working stability is high.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-described embodiments are merely illustrative of several embodiments of the present disclosure, which are described in more detail and detailed, but are not to be construed as limiting the scope of the disclosure. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the disclosure, and these changes and modifications are all within the scope of the disclosure. Therefore, the protection scope of the present disclosure should be subject to the appended claims.

Claims (6)

1. A bidirectional low-voltage large-current energy-saving feedback circuit is characterized by comprising:
the circuit comprises a secondary side sub-circuit (101), a harmonic oscillator circuit (102) connected with the secondary side sub-circuit, and a primary side sub-circuit (103) connected with the harmonic oscillator circuit (102);
wherein the resonator sub-circuit (102) comprises: tapped transformer T, resonant capacitor C1Resonant inductor L1Said resonant inductor L1Is connected to a first end of a primary winding of the tapped transformer T, the resonant inductor L1Is configured as a first connection terminal of the resonator sub-circuit (102);
the resonant capacitor C1Is connected to a second end of the primary winding of the tapped transformer T, the resonant capacitor C1Is configured as a second connection terminal of the resonator sub-circuit (102), the first connection terminal and the second connection terminal of the resonator sub-circuit (102) being connected to the primary sub-circuit (103), respectively;
and the first end, the tap end and the second end of the secondary winding of the tapped transformer T are respectively connected with the secondary sub-circuit (101), and the secondary winding of the tapped transformer T is tapped at the center.
2. The feedback circuit of claim 1 wherein the resonant capacitor C1Is 27 nF.
3. The feedback circuit of claim 1 wherein the resonant inductor L1Is 35 uH.
4. The feedback circuit of claim 1 wherein the primary winding to secondary winding of the tapped transformer T has a turn ratio of 30: 1:1, the magnetic core is PQ40/40, and the primary inductance Lp is 140 uH.
5. A feedback circuit according to any of claims 1-4, wherein the secondary side sub-circuit (101) comprises a first transistor Q1Second transistor Q2And a second inductance L2；
Wherein the second transistor Q2Is connected with a first end of a secondary winding of the tapped transformer T, and the second inductor L2Is connected with the tap end of the secondary winding of the tap transformer T, and the first transistor Q is connected to the tap end of the secondary winding of the tap transformer T1The collector of the transformer is connected with the second end of the secondary winding of the tap transformer T;
the first transistor Q1And said second transistor Q2Is connected with the second inductor L2Is connected to the second terminal of the second inductor L2Is configured as a positive terminal connected to the positive terminal of the dc power supply, the second inductance L2Is configured as a negative terminal end, connected to the negative pole of the dc power source.
6. Feedback circuit according to any of claims 1-4, characterized in that the primary side sub-circuit (103) comprises: third transistor Q3And a fourth transistor Q4A fifth transistor Q5And a sixth transistor Q6A seventh transistor Q7An eighth transistor Q8The ninth transistor Q9A tenth transistor Q10A second capacitor C2A third inductor L3And a fourth inductance L4；
Wherein the third transistor Q3Collector electrode of and the fourth transistor Q4And the second capacitor C2And the seventh transistor Q7And the eighth transistor Q8Is connected with the collector of the collector;
the fifth transistor Q5And the sixth transistor Q6And the second capacitor C2And the ninth transistor Q9And the tenth transistor Q10The emitter of (3) is connected;
the third transistor Q3And said fifth transistor Q5Is connected with the second connection end of the harmonic oscillator circuit (102), and the fourth transistor Q4And the sixth transistor Q6After being connected, the collector is connected with a first connection end of the harmonic oscillator circuit (102);
the seventh transistor Q7And the ninth transistor Q9Is connected with the fourth inductor L4Is connected to the first terminal of the fourth inductor L4Is configured as a first connection terminal of the primary side sub-circuit (103);
the eighth transistor Q8And the tenth transistor Q10Is connected with the third inductor L3Is connected to the first terminal of the third inductor L3Is configured as a second connection of the primary side sub-circuit (103).
CN202220895090.5U 2022-04-18 2022-04-18 Bidirectional low-voltage large-current energy-saving feedback circuit Active CN217037070U (en)

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CN202220895090.5U CN217037070U (en) 2022-04-18 2022-04-18 Bidirectional low-voltage large-current energy-saving feedback circuit

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Application Number Priority Date Filing Date Title
CN202220895090.5U CN217037070U (en) 2022-04-18 2022-04-18 Bidirectional low-voltage large-current energy-saving feedback circuit

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CN217037070U true CN217037070U (en) 2022-07-22

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