High-efficiency MOS (Metal Oxide Semiconductor) tube absorption circuit capable of recovering electric energy

Abstract

The utility model relates to the technical field of switching power supplies, in particular to a high-efficiency MOS (Metal Oxide Semiconductor) tube absorption circuit capable of recovering electric energy, which comprises an input port, a transformer and an MOS tube, the input port is connected with the transformer through the MOS tube; a ceramic capacitor and an electrolytic capacitor are further included; the ceramic capacitor is arranged between the source electrode of the MOS tube and the drain electrode of the MOS tube; the electrolytic capacitor is connected in parallel with the ceramic capacitor; the ceramic capacitor is used for transferring peak voltage generated between the source electrode of the MOS tube and the drain electrode of the MOS tube to the electrolytic capacitor; the system further comprises a recovery module. According to the utility model, peak voltage is absorbed through the chip capacitor, then through the filtering and energy storage effects of the electrolytic capacitor, the energy of the ceramic capacitor is transferred to the electrolytic capacitor, and then electric energy is provided for the recovery module, so that the problems of large loss and low efficiency can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch power supplies, in particular to a high-efficiency MOS tube absorption circuit through electric energy recovery. Background Art

[0002] With the development of the new energy industry, the demand for low-voltage and high-current output switching power supplies is increasing. In circuit design, a larger output current means a higher voltage spike between the source and drain when the MOS tube is turned off. Excessively high turn-off source-drain voltage will produce high switching losses, reduce the reliability of the MOS tube, and is not conducive to reducing EM I interference.

[0003] At present, the existing technology is mainly based on RCD absorption circuit or RC absorption circuit. The principle is that the peak voltage generated by turning off the MOS is absorbed by the capacitor on the absorption circuit, and then consumed by the resistor to suppress the size of the peak voltage. This method will reduce the system efficiency and has some limitations. If the capacitance is too large, it will affect the speed of turning on the MOS tube, and if it is too small, the absorption effect is not obvious. Generally, the parameters are designed according to the steady-state conditions of the MOS tube. When the protection is triggered to quickly cut off the current, the stress will far exceed the design range. Utility Model Content

[0004] The purpose of the utility model is to provide a MOS tube absorption circuit with high efficiency through electric energy recovery in view of the above-mentioned deficiencies in the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions: A MOS tube absorption circuit with high efficiency through electric energy recovery, comprising an input port, a transformer and a MOS tube; the input port is connected to the transformer through the MOS tube;

[0006] The MOS tube absorption circuit with high efficiency through electric energy recovery also includes a ceramic capacitor and an electrolytic capacitor; the ceramic capacitor is arranged between the source electrode of the MOS tube and the drain electrode of the MOS tube; the electrolytic capacitor and the ceramic capacitor are connected in parallel; the ceramic capacitor is used to transfer the peak voltage generated between the source electrode of the MOS tube and the drain electrode of the MOS tube to the electrolytic capacitor;

[0007] The MOS tube absorption circuit with high efficiency in electric energy recovery also includes a recovery module; the electrolytic capacitor is used to supply power to the recovery module.

[0008] The utility model is further configured that the ceramic capacitor is arranged between the MOS tube and the electrolytic capacitor; the electrolytic capacitor is arranged between the recovery module and the ceramic capacitor.

[0009] The utility model is further configured that a Schottky diode is provided between the source of the MOS tube and the ceramic capacitor; the source of the MOS tube is connected to the positive electrode of the Schottky diode; the negative electrode of the Schottky diode is connected to the drain of the MOS tube after passing through the ceramic capacitor.

[0010] The utility model is further configured that a TVS transient diode is provided in parallel between the electrolytic capacitor and the ceramic capacitor; and the cathode of the TVS transient diode is connected to the cathode of the Schottky diode.

[0011] The utility model is further configured that the recovery module includes an auxiliary power supply; the input end of the auxiliary power supply is connected to an electrolytic capacitor; the output end of the auxiliary power supply is provided with an adoption circuit, a control circuit and a fan circuit.

[0012] The utility model is further configured that the recovery module includes an ACDC power supply; the input end of the ACDC power supply is connected to an electrolytic capacitor; and the output end of the ACDC power supply is provided with an AC power supply port.

[0013] The utility model is further configured as follows: the input port is connected to an inductive inductor; the input port is connected to one end of the inductive inductor; the other end of the inductive inductor is connected to the drain of the MOS tube; the other end of the inductive inductor is connected to one end of the primary side of the transformer; the source of the MOS tube is grounded; and the source of the MOS tube is connected to the other end of the primary side of the transformer.

[0014] The utility model is further configured that the MOS tube absorption circuit with high efficiency in electric energy recovery also includes a first diode, a second diode, a filter capacitor and a load resistor; one end of the secondary side of the transformer is connected to the positive electrode of the first diode; the other end of the secondary side of the transformer is connected to the positive electrode of the second diode; the cathode of the first diode is connected to the cathode of the second diode; the cathode of the first diode is connected to the middle part of the secondary side of the transformer through the filter capacitor; and the load resistor is connected in parallel with the filter capacitor.

[0015] The beneficial effects of the utility model are as follows: the utility model absorbs the peak voltage through the chip capacitor, and then transfers the energy of the ceramic capacitor to the electrolytic capacitor through the filtering and energy storage function of the electrolytic capacitor to provide electrical energy for the recovery module, thereby solving the problems of large loss and low efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0017] Figure 1It is a circuit schematic diagram of the utility model;

[0018] Among them: 1. Input port; 2. Transformer; 3. MOS tube; 41. Ceramic capacitor; 42. Electrolytic capacitor; 51. Schottky diode; 52. TVS transient diode; 6. Auxiliary power supply; 61. Adopting circuit; 62. Control circuit; 63. Fan circuit; 7. ACDC power supply; 71. AC power supply port; 8. Inductive inductor; 91. First diode; 92. Second diode; 93. Filter capacitor; 94. Load resistor. DETAILED DESCRIPTION

[0019] The utility model is further described in conjunction with the following embodiments.

[0020] Depend on Figure 1 It can be seen that the MOS tube 3 absorption circuit with high efficiency through electric energy recovery described in this embodiment includes an input port 1, a transformer 2 and a MOS tube 3; the input port 1 is connected to the transformer 2 through the MOS tube 3;

[0021] The MOS tube 3 absorption circuit with high efficiency through electric energy recovery also includes a ceramic capacitor 41 and an electrolytic capacitor 42; the ceramic capacitor 41 is arranged between the source of the MOS tube 3 and the drain of the MOS tube 3; the electrolytic capacitor 42 is connected in parallel with the ceramic capacitor 41; the ceramic capacitor 41 is used to transfer the peak voltage generated between the source of the MOS tube 3 and the drain of the MOS tube 3 to the electrolytic capacitor 42; wherein the ceramic capacitor 41 is a chip ceramic capacitor 41;

[0022] The MOS tube 3 absorption circuit with high efficiency in electric energy recovery also includes a recovery module; the electrolytic capacitor 42 is used to supply power to the recovery module.

[0023] Specifically, the MOS tube 3 absorption circuit with high efficiency in energy recovery described in this embodiment is connected to the input port 1 by an AC power supply, and the MOS tube 3 is turned on and off in coordination with the transformer 2 for voltage transformation; during the on and off process of the MOS tube 3, the peak voltage generated between the source of the MOS tube 3 and the drain of the MOS tube 3 is absorbed by the chip capacitor, and then the energy of the ceramic capacitor 41 is transferred to the electrolytic capacitor 42 through the filtering and energy storage of the electrolytic capacitor 42 to provide power for the recovery module; in a steady state, the voltage of the electrolytic capacitor 42 is clamped near the recovery module. Through the above-mentioned setting, this embodiment can solve the problems of large loss and low efficiency, and the electrolytic capacitor 42 and the ceramic capacitor 41 can select larger capacitance values ​​without affecting the switching time of the MOS tube 3, and the peak voltage of the MOS tube 3 can be minimized by selecting a suitable capacitance capacitor.

[0024] In the embodiment of the invention, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is provided, wherein the ceramic capacitor 41 is provided between the MOS tube 3 and the electrolytic capacitor 42; and the electrolytic capacitor 42 is provided between the recovery module and the ceramic capacitor 41. The above arrangement can reduce the distance between the MOS tube 3 and the ceramic capacitor 41, reduce the parasitic inductance on the wiring, and absorb the high-frequency Vds peak voltage through the ceramic capacitor 41. The lower the ESR and ESL on the loop, the better the absorption effect of the ceramic capacitor 41.

[0025] In the embodiment, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is provided between the source of the MOS tube 3 and the ceramic capacitor 41, and a Schottky diode 51 is provided; the source of the MOS tube 3 is connected to the positive electrode of the Schottky diode 51; the negative electrode of the Schottky diode 51 is connected to the drain of the MOS tube 3 after passing through the ceramic capacitor 41. Specifically, by setting the Schottky diode 51, the current can only flow from the source of the MOS tube 3 to the ceramic capacitor 41 in one direction, but cannot flow from the ceramic capacitor 41 to the source of the MOS tube 3. During the shutdown period of the MOS tube 3, the current can release energy from the Schottky diode 51 to the ceramic capacitor 41 and the electrolytic capacitor 42, and during the on period of the MOS tube 3, the ceramic capacitor 41 and the electrolytic capacitor 42 are prevented from discharging and extending the on time.

[0026] In the embodiment of the invention, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is provided with a TVS transient diode 52 in parallel between the electrolytic capacitor 42 and the ceramic capacitor 41; the cathode of the TVS transient diode 52 is connected to the cathode of the Schottky diode 51. When the protection is triggered to cut off the current quickly, the subsequent circuit cannot absorb the high voltage spike energy generated by the fast cut-off current in a short time, and the TVS transient diode 52 can assist in absorbing and consuming this part of the energy, thereby improving the reliability of the circuit.

[0027] In the embodiment, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is described, and the recovery module includes an auxiliary power supply 6; the input end of the auxiliary power supply 6 is connected to the electrolytic capacitor 42; the output end of the auxiliary power supply 6 is provided with a using circuit 61, a control circuit 62 and a fan circuit 63. Through the above arrangement, the energy of the ceramic capacitor 41 is transferred to the electrolytic capacitor 42 to provide electric energy for the auxiliary power supply 6, thereby reducing the loss.

[0028] In the embodiment, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is described, and the recovery module includes an ACDC power supply 7; the input end of the ACDC power supply 7 is connected to the electrolytic capacitor 42; and the output end of the ACDC power supply 7 is provided with an AC power supply port 71. Through the above arrangement, the energy of the ceramic capacitor 41 is transferred to the electrolytic capacitor 42 to provide electric energy for the ACDC power supply 7, thereby reducing the loss.

[0029] In the embodiment of the present invention, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is described, wherein the input port 1 is connected with an inductive inductor 8; the input port 1 is connected to one end of the inductive inductor 8; the other end of the inductive inductor 8 is connected to the drain of the MOS tube 3; the other end of the inductive inductor 8 is connected to one end of the primary side of the transformer 2; the source of the MOS tube 3 is grounded; the source of the MOS tube 3 is connected to the other end of the primary side of the transformer 2. In the embodiment of the present invention, a MOS tube 3 absorption circuit with high efficiency through electric energy recovery is described, wherein the MOS tube 3 absorption circuit with high efficiency through electric energy recovery also includes a first diode 91, a second diode 92, a filter capacitor 93 and a load resistor 94; one end of the secondary side of the transformer 2 is connected to the positive electrode of the first diode 91; the other end of the secondary side of the transformer 2 is connected to the positive electrode of the second diode 92; the cathode of the first diode 91 is connected to the cathode of the second diode 92; the cathode of the first diode 91 is connected to the middle of the secondary side of the transformer 2 through the filter capacitor 93; the load resistor 94 is connected in parallel with the filter capacitor 93. Through the above arrangement, the AC power can be boosted by the cooperation of the MOS tube 3 and the transformer 2, and then rectified to provide DC power to the load.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A MOS tube absorption circuit with high efficiency through electric energy recovery, characterized in that: It comprises an input port (1), a transformer (2) and a MOS tube (3); the input port (1) is connected to the transformer (2) via the MOS tube (3); The MOS tube absorption circuit with high efficiency through electric energy recovery also includes a ceramic capacitor (41) and an electrolytic capacitor (42); the ceramic capacitor (41) is arranged between the source electrode of the MOS tube (3) and the drain electrode of the MOS tube (3); the electrolytic capacitor (42) and the ceramic capacitor (41) are connected in parallel; the ceramic capacitor (41) is used to transfer the peak voltage generated between the source electrode of the MOS tube (3) and the drain electrode of the MOS tube (3) to the electrolytic capacitor (42); The MOS tube absorption circuit with high efficiency in electric energy recovery also includes a recovery module; the electrolytic capacitor (42) is used to supply power to the recovery module.

2. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: The ceramic capacitor (41) is arranged between the MOS tube (3) and the electrolytic capacitor (42); and the electrolytic capacitor (42) is arranged between the recovery module and the ceramic capacitor (41).

3. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: A Schottky diode (51) is provided between the source electrode of the MOS tube (3) and the ceramic capacitor (41); the source electrode of the MOS tube (3) is connected to the positive electrode of the Schottky diode (51); and the negative electrode of the Schottky diode (51) is connected to the drain electrode of the MOS tube (3) after passing through the ceramic capacitor (41).

4. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 3 is characterized in that: A TVS transient diode (52) is provided in parallel between the electrolytic capacitor (42) and the ceramic capacitor (41); the cathode of the TVS transient diode (52) is connected to the cathode of the Schottky diode (51).

5. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: The recovery module comprises an auxiliary power supply (6); the input end of the auxiliary power supply (6) is connected to an electrolytic capacitor (42); and the output end of the auxiliary power supply (6) is provided with an adopting circuit (61), a control circuit (62) and a fan circuit (63).

6. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: The recovery module comprises an ACDC power supply (7); the input end of the ACDC power supply (7) is connected to an electrolytic capacitor (42); and the output end of the ACDC power supply (7) is provided with an AC power supply port (71).

7. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: The input port (1) is connected to an inductive inductor (8); the input port (1) is connected to one end of the inductive inductor (8); the other end of the inductive inductor (8) is connected to the drain of the MOS tube (3); the other end of the inductive inductor (8) is connected to one end of the primary side of the transformer (2); the source of the MOS tube (3) is grounded; and the source of the MOS tube (3) is connected to the other end of the primary side of the transformer (2).

8. The MOS tube absorption circuit with high efficiency through electric energy recovery according to claim 1, characterized in that: The MOS tube absorption circuit with high efficiency in recovering electric energy further comprises a first diode (91), a second diode (92), a filter capacitor (93) and a load resistor (94); one end of the secondary side of the transformer (2) is connected to the positive electrode of the first diode (91); the other end of the secondary side of the transformer (2) is connected to the positive electrode of the second diode (92); the cathode of the first diode (91) is connected to the cathode of the second diode (92); the cathode of the first diode (91) is connected to the middle of the secondary side of the transformer (2) via the filter capacitor (93); and the load resistor (94) is connected in parallel with the filter capacitor (93).

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