CN115694206B - Shunt type converter circuit - Google Patents
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Abstract
The invention relates to the technical field of switching power supplies and discloses a shunt type converter circuit which comprises an input circuit and an output circuit, wherein the input circuit consists of a switching transformer T1, a switching tube Q2 and a first capacitor C1; the split-type converter circuit is characterized in that a split-type winding is added on the basis of a push-pull converter circuit, so that the split-type converter circuit has a split-type effect, the winding is fully utilized, and the generation of voltage spikes is restrained; an additional winding is added to inhibit the generation of a reverse voltage spike; four lossless magnetic reset loops are formed, energy is recovered, magnetic reset is fast, direct current magnetic bias is not accumulated, voltage spikes are not generated during high-voltage input and high-voltage output, the working state is stable and reliable, the output power is high, the efficiency is high, and the circuit structure and the driving are simple; the high-voltage power supply is suitable for both high-voltage input switching power supplies and high-voltage output switching power supplies.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a shunt type converter circuit.
Background
In a plurality of switching power supply circuit topologies, the push-pull converter circuit has a plurality of excellent performance characteristics of input-output electrical isolation, small output voltage ripple, high conversion efficiency and the like, so that the push-pull converter circuit is widely focused in the industry; the circuit structure is seemingly simple, which is quite prohibitive for many designers because push-pull converters have a most headache problem and voltage spikes. The voltage spike is caused by leakage inductance of the push-pull converter, and the voltage spike is generated at the switching-off moment of the switching tube; when the double half-wave rectification high-voltage output is carried out, a reverse voltage spike exists at the reverse cut-off moment of the rectification diode; in order to solve the above technical problems, there are current rc absorption circuits, rcd absorption circuits, and so on to meet the design requirements, but it is not found that the voltage spike problem can be fundamentally solved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a shunt type converter circuit; the shunt type converter circuit is characterized in that a shunt winding is added on the basis of a push-pull converter circuit, when a switching tube is conducted, the shunt type converter circuit plays a role in shunt, when the switching tube is cut off, voltages at two ends of the shunt winding generate sine wave oscillation, direct current magnetic bias is never accumulated, the winding is fully utilized, four lossless magnetic reset loops are formed, and voltage spikes are thoroughly restrained; the additional windings are added, four discharge loops are formed, and reverse voltage spike generation is restrained; the four lossless magnetic reset loops all utilize filter capacitors of the power supply circuit to participate in magnetic reset, so that energy is recovered, the magnetic reset is fast, the energy is fully utilized, and voltage spikes are not generated during high-voltage input and high-voltage output.
The specific technical scheme of the invention is as follows: a shunt converter circuit comprises an input circuit and an output circuit.
The input circuit consists of a switching transformer T1, a switching tube Q2 and a first capacitor C1.
The switching transformer T1 is composed of a first peak suppression component and a second peak suppression component.
The first peak suppression component is formed by connecting two ends of a primary winding N1 and a shunt winding N2 in parallel, and the primary winding N1 is provided with a center tap a3.
The second peak suppression component consists of an additional winding N3 and two ends of a secondary winding N4 which are connected in parallel, and the secondary winding N4 is provided with a center tap s3.
Wherein, the internal connection relation of the input circuit is as follows: the center tap a3 of the primary winding N1 of the first peak suppression component is connected with the positive pole IN+ of the direct current input end and then connected with the positive pole of the first capacitor C1, the a1 end of the primary winding N1 is connected with the b1 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q2, the a2 end of the primary winding N1 is connected with the b2 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q1, the grid electrode of the switching tube Q2 is connected with the control signal H2, the grid electrode of the switching tube Q1 is connected with the control signal H1, and the source electrode of the switching tube Q1, the source electrode of the switching tube Q2 and the negative electrode of the first capacitor C1 are connected with the negative pole IN-of the direct current input end.
The output circuit consists of a diode D1, a diode D2, an inductor L1 and a second capacitor C2.
Wherein, the internal connection relation of the output circuit is as follows: one end s1 of a secondary winding N4 of the second peak suppression component is connected with the x1 end of an additional winding N3 and then connected with the positive electrode of a diode D1, the other end s2 of the secondary winding N4 is connected with the x2 end of the additional winding N3 and then connected with the positive electrode of a diode D2, the negative electrode of the diode D1, the negative electrode of the diode D2 and the positive electrode of a second capacitor C2 are all connected with a direct current output end OUT+, a center tap s3 of the secondary winding N4 is connected with one end of an inductor L1, and the other end of the inductor L1 and the negative electrode of the second capacitor C2 are all connected with a direct current output end OUT-.
The number of turns of the primary winding N1 and the number of turns of the shunt winding N2 of the first peak suppression component are the same, and the wire diameters may not be equal.
Wherein the number of turns of the additional winding N3 and the secondary winding N4 of the second peak suppression assembly are the same, and the wire diameters of the additional winding N3 and the secondary winding N4 can be unequal.
The a1 end of the primary winding N1, the b1 end of the shunt winding N2, the x1 end of the additional winding N3, and the s1 end of the secondary winding N4 of the second peak suppression component of the switching transformer T1 are the same name ends.
The phase difference between the control signals H1 and H2 is 180 degrees.
The switch tube Q1 and the switch tube Q2 are NMOS field effect tube Q1 and NMOS field effect tube Q2 respectively.
The specific working process of the shunt type converter circuit comprises the following steps:
When the control signal H1 is IN a high level, the switching tube Q2 is turned off, the switching tube Q1 is turned on, coils from the center tap a3 to the a2 end of the primary winding N1 of the first peak suppression component of the switching transformer T1 are electrified to generate a magnetic field, the coils from the center tap a3 to the a1 end of the primary winding N1 generate induced electromotive force to be overlapped with the voltage of the positive pole IN+ of the direct current input end according to the electromagnetic induction principle, the voltage of the a1 end of the primary winding N1 is increased to supply power to the shunt winding N2, the shunt winding N2 is electrified to generate the magnetic field, energy is transmitted to the additional winding N3 and the secondary winding N4 of the second peak suppression component through the soft magnet core of the switching transformer T1, positive voltage is generated at the x1 end of the additional winding N3 and the s1 end of the secondary winding N4 according to the forward excitation principle of the switching power supply, the diode D1 is conducted, and the diode D2 is reversely cut off; the current passes through the x1 end of the additional winding N3, the diode D1, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4, the s2 end of the secondary winding N4, the x2 end of the additional winding N3 and the x1 end of the additional winding N3 form a discharge loop, so that the generation of a reverse voltage spike is restrained, the reverse voltage spike is restrained because the voltage spike is caused by leakage inductance of a push-pull converter, the leakage inductance is in direct proportion to the square of the turns of a winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the additional winding N3 and the secondary winding N4 are connected in parallel to achieve direct coupling, and the current passes through the s2 end of the secondary winding N4 under the action of the power absorption of the second capacitor C2, so that the reverse voltage spike cannot be generated at the s2 end of the secondary winding N4; the current passes through the s1 end of the secondary winding N4, the diode D1, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4 and the s1 end of the secondary winding N4 to form a discharge loop; the direct current output end positive electrode IN+ outputs electric energy to a load while filtering and storing energy through a discharge loop;
When the control signal H2 is IN a high level, the switching tube Q1 is turned off, the switching tube Q2 is turned on, coils from a3 end to a1 end of a center tap of a primary winding N1 of a first peak suppression component of the switching transformer T1 are electrified to generate a magnetic field, coils from a3 end to a2 end of the center tap of the primary winding N1 generate induced electromotive force to be overlapped with the voltage of a positive pole IN+ of a direct current input end according to an electromagnetic induction principle, the voltage of the a2 end of the primary winding N1 is increased to supply power to a shunt winding N2, the shunt winding N2 is electrified to generate the magnetic field, energy is transmitted to an additional winding N3 and a secondary winding N4 of the second peak suppression component through a soft magnet core of the switching transformer T1, positive voltage is generated at an x2 end of the additional winding N3 and an s2 end of the secondary winding N4 according to the forward principle of a switching power supply, a diode D2 is conducted, and a diode D1 is reversely cut off; the current passes through the x2 end of the additional winding N3, the diode D2, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4, the s1 end of the secondary winding N4, the x1 end of the additional winding N3 and the x2 end of the additional winding N3 form a discharge loop, so that the generation of a reverse voltage spike is restrained, the reverse voltage spike is restrained because the voltage spike is caused by leakage inductance of a push-pull converter, the leakage inductance is in direct proportion to the square of the turns of a winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the additional winding N3 and the secondary winding N4 are connected in parallel to achieve direct coupling, and the current passes through the s1 end of the secondary winding N4 under the action of the power absorption of the second capacitor C2, so that the reverse voltage spike cannot be generated at the s1 end of the secondary winding N4; the current passes through the s2 end of the secondary winding N4, the diode D2, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4 and the s2 end of the secondary winding N4 to form a discharge loop; the direct current output end positive electrode IN+ outputs electric energy to a load while filtering and storing energy through a discharge loop;
When the switching tube Q1 is turned off and the switching tube Q2 is not turned on, the switching transformer T1 is automatically magnetically reset immediately; according to the counter electromotive force principle, the voltage of the a2 end of the primary winding N1 and the voltage of the b2 end of the shunt winding N2 are increased; the current passes through the a1 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q2 and the a1 end of the primary winding N1 to form a magnetic reset loop; the current passes through the b1 end of the shunt winding N2, the b2 end of the shunt winding N2, the a2 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q2, and the b1 end of the shunt winding N2 to form a magnetic reset loop, so that the generation of a voltage peak is inhibited, the voltage peak is caused by leakage inductance of the push-pull converter, the leakage inductance is in direct proportion to the square of the turns of the winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the shunt winding N2 and the primary winding N1 are connected in parallel to achieve direct coupling, and the a2 end of the primary winding N1 is provided with current to pass through under the action of the first capacitor C1, so that the voltage peak cannot be generated at the a2 end of the primary winding N1; meanwhile, the additional winding N3 and the secondary winding N4 of the second peak suppression component of the switching transformer T2 output electric energy;
when the switching tube Q2 is turned off and the switching tube Q1 is not turned on, the switching transformer T1 is automatically magnetically reset immediately; according to the counter electromotive force principle, the voltage of the a1 end of the primary winding N1 and the voltage of the b1 end of the shunt winding N2 are increased; the current passes through the a2 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q1 and the a2 end of the primary winding N1 to form a magnetic reset loop; the current passes through the b2 end of the shunt winding N2, the b1 end of the shunt winding N2, the a1 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q1, and the b2 end of the shunt winding N2 to form a magnetic reset loop, so that the generation of a voltage peak is inhibited, the voltage peak is caused by leakage inductance of the push-pull converter, the leakage inductance is in direct proportion to the square of the turns of the winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the shunt winding N2 and the primary winding N1 are connected in parallel to achieve direct coupling, and the a1 end of the primary winding N1 is provided with current to pass through under the action of the first capacitor C1, so that the voltage peak cannot be generated at the a1 end of the primary winding N1; meanwhile, the additional winding N3 and the secondary winding N4 of the second peak suppression component of the switching transformer T2 output electric energy;
When the switching tube Q1 is conducted, the shunt winding N2 plays a role in shunt; when the switching tube Q2 is conducted, the shunt winding N2 also plays a role in shunt; when the switching tube Q1 is turned off and the switching tube Q2 is not turned on, the shunt winding N2 discharges to the first capacitor C1, so that the voltage at two ends of the primary winding N1 changes and oscillates according to the sine wave rule, direct current magnetic bias is not accumulated, and the oscillation frequency is increased along with the increase of the load; when the switching tube Q2 is turned off and the switching tube Q1 is not turned on, the shunt winding N2 discharges to the first capacitor C1, so that the voltage at two ends of the primary winding N1 changes and oscillates according to the sine wave rule, direct current magnetic bias is not accumulated, and the oscillation frequency is increased along with the increase of the load.
Preferably, the switching transistor Q1 and the switching transistor Q2 are an IGBT insulated gate bipolar transistor Q1 and an IGBT insulated gate bipolar transistor Q2, respectively.
The invention has the beneficial effects that:
According to the split-type converter circuit, the split-type winding is added to play a role in split, the winding is fully utilized, four lossless magnetic reset loops are formed, and the generation of voltage spikes is thoroughly restrained; the additional windings are added to form four discharge loops, so that the generation of reverse voltage spikes is inhibited; the energy is fully utilized, the output power is high, and the efficiency is high; the voltage at two ends of the shunt winding generates sine wave oscillation, the sine wave oscillation means oscillation according to sine wave law, direct current magnetic bias is not accumulated, voltage spikes are not generated during high-voltage input and high-voltage output, the working state is stable and reliable, and the circuit structure and the driving are simple; the high-voltage power supply is suitable for both high-voltage input switching power supplies and high-voltage output switching power supplies.
Drawings
FIG. 1 is a schematic diagram of a shunt type converter circuit connection according to the present invention;
fig. 2 is a schematic voltage waveform diagram of the control signal H1, the control signal H2, the drain of the switching tube Q1, and the drain of the switching tube Q2 according to the present invention.
Detailed Description
The technology of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a shunt converter circuit includes an input circuit and an output circuit;
the input circuit consists of a switching transformer T1, a switching tube Q2 and a first capacitor C1;
The switching transformer T1 is composed of a first peak suppression component and a second peak suppression component;
The first peak suppression component consists of a primary winding N1 and two ends of a shunt winding N2 which are connected in parallel, and the primary winding N1 is provided with a center tap a3;
the second peak suppression component consists of an additional winding N3 and two ends of a secondary winding N4 which are connected in parallel, and the secondary winding N4 is provided with a center tap s3;
Wherein, the internal connection relation of the input circuit is as follows: the center tap a3 of the primary winding N1 of the first peak suppression component is connected with the positive pole IN+ of the direct current input end and then connected with the positive pole of the first capacitor C1, the a1 end of the primary winding N1 is connected with the b1 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q2, the a2 end of the primary winding N1 is connected with the b2 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q1, the grid electrode of the switching tube Q2 is connected with the control signal H2, the grid electrode of the switching tube Q1 is connected with the control signal H1, and the source electrode of the switching tube Q1, the source electrode of the switching tube Q2 and the negative electrode of the first capacitor C1 are connected with the negative pole IN-of the direct current input end;
the output circuit consists of a diode D1, a diode D2, an inductor L1 and a second capacitor C2;
Wherein, the internal connection relation of the output circuit is as follows: one end s1 of a secondary winding N4 of the second peak suppression component is connected with the x1 end of an additional winding N3 and then connected with the positive electrode of a diode D1, the other end s2 of the secondary winding N4 is connected with the x2 end of the additional winding N3 and then connected with the positive electrode of a diode D2, the negative electrode of the diode D1, the negative electrode of the diode D2 and the positive electrode of a second capacitor C2 are all connected with a direct current output end OUT+, a center tap s3 of the secondary winding N4 is connected with one end of an inductor L1, and the other end of the inductor L1 and the negative electrode of the second capacitor C2 are all connected with a direct current output end OUT-;
in this embodiment, the primary winding N1 and the shunt winding N2 of the first peak suppression component have the same number of turns and the same wire diameter;
in this embodiment, the number of turns of the additional winding N3 and the number of turns of the secondary winding N4 of the second peak suppression component are the same, and the wire diameter of the additional winding N3 is one fourth of the wire diameter of the secondary winding N4;
In this embodiment, the a1 end of the primary winding N1, the b1 end of the shunt winding N2, the x1 end of the additional winding N3, and the s1 end of the secondary winding N4 of the first peak suppression component of the switching transformer T1 are the same name ends;
In this embodiment, as shown in fig. 2, the control signals H1 and H2 are rectangular wave signals with a phase difference of 180 degrees;
In this embodiment, the switching tube Q1 and the switching tube Q2 are an NMOS field effect tube Q1 and an NMOS field effect tube Q2, respectively;
the specific working process of the shunt type converter circuit comprises the following steps:
As shown IN fig. 2, IN the time period from T1 to T2, the control signal H1 is that the high-level switching tube Q2 is turned off, the switching tube Q1 is turned on, the drain voltage of the switching tube Q1 is approximately equal to zero, the coils at the center tap a3 to a2 ends of the primary winding N1 of the first peak suppression component of the switching transformer T1 are energized to generate a magnetic field, according to the electromagnetic induction principle, the coils at the center tap a3 to a1 ends of the primary winding N1 generate induced electromotive force to be superimposed with the voltage of the positive electrode in+ at the direct current input end, so that the voltage at the a1 end of the primary winding N1 is increased, that is, the drain voltage of the switching tube Q2 is high, the shunt winding N2 is powered, the shunt winding N2 is energized to generate a magnetic field, the soft magnetic core of the switching transformer T1 transfers energy to the additional winding N3 and the secondary winding N4 of the second peak suppression component, according to the forward excitation principle of the switching power supply, the x1 end of the additional winding N3 and the s1 end of the secondary winding N4 generate positive voltage, the diode D1 is turned on, and the diode D2 is turned off reversely; the current passes through the x1 end of the additional winding N3, the diode D1, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4, the s2 end of the secondary winding N4, the x2 end of the additional winding N3 and the x1 end of the additional winding N3 form a discharge loop, so that the generation of a reverse voltage spike is restrained, the reverse voltage spike is restrained because the voltage spike is caused by leakage inductance of a push-pull converter, the leakage inductance is in direct proportion to the square of the turns of a winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the additional winding N3 and the secondary winding N4 are connected in parallel to achieve direct coupling, and the current passes through the s2 end of the secondary winding N4 under the action of the power absorption of the second capacitor C2, so that the reverse voltage spike cannot be generated at the s2 end of the secondary winding N4; the current passes through the s1 end of the secondary winding N4, the diode D1, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4 and the s1 end of the secondary winding N4 to form a discharge loop; the direct current output end positive electrode IN+ outputs electric energy to a load while filtering and storing energy through a discharge loop;
IN the period from T4 to T5, the control signal H2 is that the high-level switch tube Q1 is turned off, the switch tube Q2 is turned on, the drain voltage of the switch tube Q2 is approximately equal to zero, coils at the ends from a3 to a1 of a primary winding N1 of a first peak suppression component of the switch transformer T1 are electrified to generate a magnetic field, coils at the ends from a3 to a2 of the primary winding N1 generate induced electromotive force to be overlapped with the voltage of a positive electrode IN+ of a direct current input end according to an electromagnetic induction principle, the voltage at the end a2 of the primary winding N1 is increased, namely, the drain voltage of the switch tube Q1 is high, the shunt winding N2 is powered, the shunt winding N2 is electrified to generate a magnetic field, energy is transmitted to an additional winding N3 and a secondary winding N4 of the second peak suppression component through a soft magnetic core of the switch transformer T1, the end x2 of the additional winding N3 and the end s2 of the secondary winding N4 generate positive voltage according to a forward excitation principle of the switch power supply, and the diode D1 is reversely turned on; the current passes through the x2 end of the additional winding N3, the diode D2, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4, the s1 end of the secondary winding N4, the x1 end of the additional winding N3 and the x2 end of the additional winding N3 form a discharge loop, so that the generation of a reverse voltage spike is restrained, the reverse voltage spike is restrained because the voltage spike is caused by leakage inductance of a push-pull converter, the leakage inductance is in direct proportion to the square of the turns of a winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the additional winding N3 and the secondary winding N4 are connected in parallel to achieve direct coupling, and the current passes through the s1 end of the secondary winding N4 under the action of the power absorption of the second capacitor C2, so that the reverse voltage spike cannot be generated at the s1 end of the secondary winding N4; the current passes through the s2 end of the secondary winding N4, the diode D2, the second capacitor C2, the inductor L1, the center tap s3 of the secondary winding N4 and the s2 end of the secondary winding N4 to form a discharge loop; the direct current output end positive electrode IN+ outputs electric energy to a load while filtering and storing energy through a discharge loop;
In the time period from T2 to T3, the switching tube Q1 is turned off, the switching tube Q2 is not turned on, and the switching transformer T1 is immediately and automatically magnetically reset; according to the counter electromotive force principle, the voltages of an a2 end of the primary winding N1 and a b2 end of the shunt winding N2 are increased, the drain voltage of the switching tube Q1 is increased in a sine wave rule, and the drain voltage of the switching tube Q2 is decreased in a sine wave rule; the current passes through the a1 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q2 and the a1 end of the primary winding N1 to form a magnetic reset loop; the current passes through the b1 end of the shunt winding N2, the b2 end of the shunt winding N2, the a2 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q2, and the b1 end of the shunt winding N2 to form a magnetic reset loop, so that the generation of a voltage peak is inhibited, the voltage peak is caused by leakage inductance of the push-pull converter, the leakage inductance is in direct proportion to the square of the turns of the winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the shunt winding N2 and the primary winding N1 are connected in parallel to achieve direct coupling, and the a2 end of the primary winding N1 is provided with current to pass through under the action of the first capacitor C1, so that the voltage peak cannot be generated at the a2 end of the primary winding N1; meanwhile, the additional winding N3 and the secondary winding N4 of the second peak suppression component of the switching transformer T2 output electric energy;
In the time period from T5 to T6, the switching tube Q2 is turned off, the switching tube Q1 is not turned on, and the switching transformer T1 is immediately and automatically magnetically reset; according to the counter electromotive force principle, the voltages of the a1 end of the primary winding N1 and the b1 end of the shunt winding N2 are increased, the drain voltage of the switching tube Q2 is increased in a sine wave rule, and the drain voltage of the switching tube Q1 is decreased in a sine wave rule; the current passes through the a2 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q1 and the a2 end of the primary winding N1 to form a magnetic reset loop; the current passes through the b2 end of the shunt winding N2, the b1 end of the shunt winding N2, the a1 end of the primary winding N1, the center tap a3 of the primary winding N1, the first capacitor C1, the body diode of the switching tube Q1, and the b2 end of the shunt winding N2 to form a magnetic reset loop, so that the generation of a voltage peak is inhibited, the voltage peak is caused by leakage inductance of the push-pull converter, the leakage inductance is in direct proportion to the square of the turns of the winding coil, the leakage inductance is in inverse proportion to the coupling degree of the primary winding and the secondary winding, the shunt winding N2 and the primary winding N1 are connected in parallel to achieve direct coupling, and the a1 end of the primary winding N1 is provided with current to pass through under the action of the first capacitor C1, so that the voltage peak cannot be generated at the a1 end of the primary winding N1; meanwhile, the additional winding N3 and the secondary winding N4 of the second peak suppression component of the switching transformer T2 output electric energy;
in the time period from t1 to t2, the switching tube Q1 is conducted, and the shunt winding N2 plays a role in shunt; in the time period from t4 to t5, the switching tube Q2 is conducted, and the shunt winding N2 also plays a role in shunt; in the time period from t2 to t4, the switching tube Q1 is turned off, the switching tube Q2 is not turned on, the shunt winding N2 discharges to the first capacitor C1, the voltage at two ends of the primary winding N1 is enabled to change and oscillate according to the sine wave law, direct current magnetic bias is not accumulated, and the oscillation frequency is increased along with the increase of the load; in the period from t5 to t7, the switching tube Q2 is turned off, the switching tube Q1 is not turned on, the shunt winding N2 discharges to the first capacitor C1, the voltage at two ends of the primary winding N1 is enabled to change and oscillate according to the sine wave rule, direct current magnetic bias is not accumulated, and the oscillation frequency is increased along with the increase of the load.
Example 2
Example 2 differs from example 1 in that:
The switching tube Q1 and the switching tube Q2 are respectively an IGBT insulated gate bipolar transistor Q1 and an IGBT insulated gate bipolar transistor Q2.
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (2)
1. A shunt converter circuit, characterized by: comprises an input circuit and an output circuit;
the input circuit consists of a switching transformer T1, a switching tube Q2 and a first capacitor C1;
The switching transformer T1 is composed of a first peak suppression component and a second peak suppression component;
The first peak suppression component consists of a primary winding N1 and two ends of a shunt winding N2 which are connected in parallel, and the primary winding N1 is provided with a center tap a3;
the second peak suppression component consists of an additional winding N3 and two ends of a secondary winding N4 which are connected in parallel, and the secondary winding N4 is provided with a center tap s3;
Wherein, the internal connection relation of the input circuit is as follows: the center tap a3 of the primary winding N1 of the first peak suppression component is connected with the positive pole IN+ of the direct current input end and then connected with the positive pole of the first capacitor C1, the a1 end of the primary winding N1 is connected with the b1 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q2, the a2 end of the primary winding N1 is connected with the b2 end of the shunt winding N2 and then connected with the drain electrode of the switching tube Q1, the grid electrode of the switching tube Q2 is connected with the control signal H2, the grid electrode of the switching tube Q1 is connected with the control signal H1, and the source electrode of the switching tube Q1, the source electrode of the switching tube Q2 and the negative electrode of the first capacitor C1 are connected with the negative pole IN-of the direct current input end;
the output circuit consists of a diode D1, a diode D2, an inductor L1 and a second capacitor C2;
Wherein, the internal connection relation of the output circuit is as follows: one end s1 of a secondary winding N4 of the second peak suppression component is connected with the x1 end of an additional winding N3 and then connected with the positive electrode of a diode D1, the other end s2 of the secondary winding N4 is connected with the x2 end of the additional winding N3 and then connected with the positive electrode of a diode D2, the negative electrode of the diode D1, the negative electrode of the diode D2 and the positive electrode of a second capacitor C2 are all connected with a direct current output end OUT+, a center tap s3 of the secondary winding N4 is connected with one end of an inductor L1, and the other end of the inductor L1 and the negative electrode of the second capacitor C2 are all connected with a direct current output end OUT-;
the primary winding N1 and the shunt winding N2 of the first peak suppression component have the same number of turns, and have the same or different wire diameters;
Wherein the number of turns, the wire diameter and the wire diameter of the additional winding N3 and the secondary winding N4 of the second peak suppression component are the same, or are not the same;
The a1 end of the primary winding N1, the b1 end of the shunt winding N2, the x1 end of the additional winding N3 and the s1 end of the secondary winding N4 of the second peak suppression component of the switching transformer T1 are the same name ends;
the phase difference between the control signals H1 and H2 is 180 degrees;
The switch tube Q1 and the switch tube Q2 are NMOS field effect tube Q1 and NMOS field effect tube Q2 respectively.
2. A shunt converter circuit according to claim 1, wherein said switching transistor Q1 and said switching transistor Q2 are respectively IGBT insulated gate bipolar transistor Q1 and IGBT insulated gate bipolar transistor Q2.
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| CN202211342138.0A CN115694206B (en) | 2022-10-31 | 2022-10-31 | Shunt type converter circuit |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108696142A (en) * | 2018-06-28 | 2018-10-23 | 张家港鑫峰机电有限公司 | A kind of high frequency transformer of frequency conversion type Switching Power Supply |
| CN113489337A (en) * | 2021-07-28 | 2021-10-08 | 重庆星座汽车科技有限公司 | Full-string bidirectional converter circuit |
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| KR100848685B1 (en) * | 2006-11-06 | 2008-07-28 | 박찬웅 | circuit for output voltage error correction in SMPS which regulation is done by primary side control |
| EP2144359A2 (en) * | 2008-07-09 | 2010-01-13 | SMA Solar Technology AG | DC/DC-converter |
| US8233250B2 (en) * | 2009-12-23 | 2012-07-31 | R2 Semiconductor, Inc. | Over voltage protection of switching converter |
| US8451630B2 (en) * | 2010-07-13 | 2013-05-28 | Power Integrations, Inc. | Reset voltage circuit for a forward power converter |
| CN102412715B (en) * | 2011-12-07 | 2014-11-05 | 杭州中恒电气股份有限公司 | Circuit of restraining reverse spike voltage output of commutation diode |
| CN105375740B (en) * | 2014-09-01 | 2018-01-30 | 台达电子工业股份有限公司 | Circuit for power conversion |
| CN110048698A (en) * | 2019-04-17 | 2019-07-23 | 西安电子科技大学 | Inhibit the driving circuit of SiC MOSFET grid crosstalk |
| CN216929877U (en) * | 2021-12-17 | 2022-07-08 | 安徽鸿创新能源动力有限公司 | Transformer leakage inductance absorption circuit of switching power supply and switching power supply |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108696142A (en) * | 2018-06-28 | 2018-10-23 | 张家港鑫峰机电有限公司 | A kind of high frequency transformer of frequency conversion type Switching Power Supply |
| CN113489337A (en) * | 2021-07-28 | 2021-10-08 | 重庆星座汽车科技有限公司 | Full-string bidirectional converter circuit |
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