CN216672858U - High-frequency switching power supply - Google Patents
High-frequency switching power supply Download PDFInfo
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- CN216672858U CN216672858U CN202122636951.6U CN202122636951U CN216672858U CN 216672858 U CN216672858 U CN 216672858U CN 202122636951 U CN202122636951 U CN 202122636951U CN 216672858 U CN216672858 U CN 216672858U
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a high-frequency switching power supply, which comprises a high-frequency switching circuit and an energy regeneration circuit, wherein the input end of the high-frequency switching circuit is connected with a high-voltage power supply and a control port, the input end of the energy regeneration circuit is connected with the control port, and the high-frequency switching circuit is connected with the energy regeneration circuit; the control port is used for outputting a level signal so as to control the high-frequency switch circuit and the energy regeneration circuit; the energy regeneration circuit comprises a MOS tube Q2 and a capacitor C1, and the MOS tube Q2 and the capacitor C1 are both connected with the high-frequency switch circuit. The utility model eliminates the peak voltage generated by the high-frequency switch, improves the overall efficiency of the switch power supply and avoids the defects of large electromagnetic radiation and low energy efficiency of the traditional high-frequency switch power supply.
Description
Technical Field
The utility model relates to the technical field of high-frequency switches, in particular to a high-frequency switching power supply.
Background
The flyback power supply has the problem of low energy efficiency in the use process. As shown in fig. 1, it is a conventional flyback transformer topology circuit. In the working process, leakage inductance and peak stray energy generated when the switching tube is turned off are absorbed by a resistor R1, a resistor R2 and a capacitor C1 in a residual leakage action protector (RCD) so as to eliminate leakage inductance peak voltage generated when the switching tube is turned off. However, the effect of absorbing the peak voltage is poor, the loss is large, the high-frequency electromagnetic interference is large, and the overall energy efficiency of the power supply is low.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide a high frequency switching power supply, which has high effect of eliminating the peak voltage generated by the high frequency transformer and improves the overall energy efficiency of the power supply.
The purpose of the utility model is realized by adopting the following technical scheme:
a high-frequency switch power supply comprises a high-frequency switch circuit and an energy regeneration circuit, wherein the input end of the high-frequency switch circuit is connected with a high-voltage power supply and a control port, the input end of the energy regeneration circuit is connected with the control port, and the high-frequency switch circuit and the energy regeneration circuit are mutually connected; the control port is used for outputting a level signal so as to control the high-frequency switch circuit and the energy regeneration circuit; the energy regeneration circuit comprises a MOS tube Q2 and a capacitor C1, the MOS tube Q2 and the capacitor C1 are both connected with the high-frequency switch circuit, and the MOS tube Q2 is used for controlling the charging and discharging of the capacitor C1 according to a level signal of the control port.
Further, the high frequency switch circuit includes a transformer T1 and a switch tube Q1, the transformer T1 includes a pin a and a pin B, the pin a of the transformer T1 is connected to a high voltage power supply through the capacitor C1, the pin B of the transformer T1 is connected to the MOS tube Q2, and the switch tube Q1 is connected to a control port, the transformer T1 and the MOS tube Q2.
Furthermore, the gate of a MOS transistor Q2 in the energy regeneration circuit is connected to the control port, the source of the MOS transistor Q2 is connected to the pin B of the transformer T1, and the drain of the MOS transistor Q2 is connected to the switching transistor Q1.
Further, a capacitor C1 in the energy regeneration circuit is connected to the pin 6 and the pin a of the transformer T1, and when the switching tube Q1 is turned off and the transformer T1 is in the reverse direction, a diode in the MOS tube Q2 charges the capacitor C1 through the pin a and the pin B of the transformer.
The current detection circuit comprises a resistor R7, a resistor R8, a resistor R9 and a resistor R10, the uniform ends of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are connected with a capacitor C3 and a switch tube Q1, and the other ends of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are all grounded.
Furthermore, the high-frequency switch circuit further comprises an output filter circuit, wherein the input end of the output filter circuit is connected with the input end of the high-frequency switch circuit, and the output end of the output filter circuit is grounded.
Further, the output filter circuit comprises an electrolytic capacitor EC2, a diode D3 and a capacitor C5, wherein the anode of the diode D3 is connected to the 11 th pin and the 12 th pin of the transformer T1, the cathode of the diode D3 is connected to the electrolytic capacitor EC2 and the capacitor C5, and the other ends of the capacitor C5 and the electrolytic capacitor EC2 are grounded; after the switching tube Q1 is turned off, the 11 th pin and the 12 th pin of the transformer T1 charge the electrolytic capacitor EC 2.
Further, the gate of the switching tube Q1 is connected to the control port, the drain of the switching tube Q1 is connected to the drain of the MOS tube and the 4 th pin of the transformer T1, and the source of the switching tube Q1 is grounded via the current detection circuit; and the source and the drain of the switching tube Q1 are respectively connected with two ends of the capacitor C3.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a high-frequency switching power supply, wherein an energy regeneration circuit is arranged at the output end of the high-frequency switching circuit, a capacitor C1 is charged through an MOS (metal oxide semiconductor) tube Q2 of the energy regeneration circuit when a switching tube Q1 is turned off, electric energy is stored in a transformer when a switching tube Q1 is turned on, and the energy of the transformer T1 is released after the switching tube Q1 is turned off, so that leakage inductance and peak voltage generated by the transformer T1 are recycled, the peak voltage generated by a high-frequency switch is eliminated, the overall efficiency of the switching power supply is improved, and the defects of high electromagnetic radiation and low energy efficiency of the conventional high-frequency switching power supply are overcome.
Drawings
FIG. 1 is a schematic diagram of a circuit provided in the background art;
FIG. 2 is a schematic diagram of a first current direction circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a current flow direction three circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a second current direction according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The utility model provides a high-frequency switching power supply, which has high effect of eliminating peak voltage generated by a high-frequency transformer and improves the overall energy efficiency of the power supply.
Specifically, as shown in fig. 2, the high-frequency switching power supply includes a high-frequency switching circuit and an energy regeneration circuit, an input end of the high-frequency switching circuit is connected to the high-voltage power supply and the control port, an input end of the energy regeneration circuit is connected to the control port, and the high-frequency switching circuit and the energy regeneration circuit are connected to each other; the control port is used for outputting a level signal so as to control the high-frequency switch circuit and the energy regeneration circuit; the energy regeneration circuit comprises a MOS tube Q2 and a capacitor C1, the MOS tube Q2 and the capacitor C1 are both connected with the high-frequency switch circuit, and the MOS tube Q2 is used for controlling the charging and discharging of the capacitor C1 according to a level signal of the control port. The energy regeneration circuit eliminates the peak voltage generated by the high-frequency switch by utilizing the principle that the current in the inductor can not change suddenly and the voltage at two ends of the capacitor can not change suddenly.
The high-frequency switch circuit comprises a transformer T1 and a switch tube Q1, the transformer T1 comprises a pin A and a pin B, the pin A of the transformer T1 is connected with a high-voltage power supply through a capacitor C1, the pin B of the transformer T1 is connected with the MOS tube Q2, the switch tube Q1 is connected with a control port, the transformer T1 and the MOS tube Q2, and two ends of the capacitor C3 are connected in parallel with the drain electrode and the source electrode of the switch tube Q1. The control port is a main control chip driving square wave output port, outputs high level or low level and controls the on/off of the switching tube Q1.
In the energy regeneration circuit, the gate of a MOS transistor Q2 is connected to the control port, the source of a MOS transistor Q2 is connected to the pin B of the transformer T1, and the drain of the MOS transistor Q2 is connected to the drain of the switching transistor Q1 and the capacitor C3. And one end of a capacitor C1 in the energy regeneration circuit is connected with the high-voltage power supply, and the other end of the capacitor C1 is connected with the pin A of the transformer T1.
The high-frequency switching power supply further comprises a current detection circuit, wherein the current detection circuit comprises a resistor R7, a resistor R8, a resistor R9 and a resistor R10, the uniform ends of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are connected with the capacitor C3, and the other ends of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are all grounded. Meanwhile, the high-frequency switch circuit also comprises an output filter circuit, wherein the input end of the output filter circuit is connected with the input end of the high-frequency switch circuit, and the output end of the output filter circuit is grounded. The output filter circuit comprises an electrolytic capacitor EC2, a diode D3 and a capacitor C5, wherein the anode of the diode D3 is connected with the 11 th pin and the 12 th pin of the transformer T1, the cathode of the diode D3 is connected with the electrolytic capacitor EC2 and the capacitor C5, and the other ends of the capacitor C5 and the electrolytic capacitor EC2 are grounded.
As shown in fig. 2, when the control port DR outputs a high level T1, the switch Q1 is turned on, and the current goes along a current path one shown in fig. 2, and flows along the 6 th pin to the 4 th pin of the transformer T1, through the switch Q1 to the resistor R7, the resistor R8, the resistor R9 and the resistor R10 of the current detection circuit, until the ground connection, thereby completing the energy storage of the primary transformer. When the control port DR outputs a low level t2 and the switch Q1 is turned off, the current flow is as shown by the current flow three in fig. 3. When the switch Q1 is turned off, the MOS transistor Q2 is turned on, the voltage of the transformer T1 is reversed due to the open circuit of the switch, the 4 th pin is at a high level, the drain of the switch Q1 is at a high level, and the current charges the capacitor C1 through the diode in the MOS transistor Q2, the pin B and the pin a of the transformer T1, so that secondary energy storage is completed, and energy generated by the leakage inductance of the transformer, the secondary side reflected voltage and the like is stored in the capacitor C1.
When the switch Q1 is turned on and the switch Q1 is turned on, the MOS transistor Q2 is not turned off in time, and the current flow is as shown in fig. 4 as current flow direction two, at this time, the electric energy in the capacitor C1 is discharged through the pin a and pin B of the transformer T1, the MOS transistor Q2, the switch Q1, the resistor R7, the resistor R8, the resistor R9, and the resistor R10, and the electric energy is stored in the transformer T1 through the pin a and pin B of the transformer T1. When the switching tube Q1 is turned off, the shop capacitor EC2 is charged by the winding 11 th pin and the winding 12 th pin of the transformer T1, so as to discharge the electric energy stored in the transformer T1.
An energy regeneration circuit is arranged at the output end of the high-frequency switch circuit, when the switch tube Q1 is switched off, the capacitor C1 is charged through the MOS tube Q2 of the energy regeneration circuit, when the switch tube Q1 is switched on, electric energy is stored in the transformer, and after the switch tube Q1 is switched off, the energy of the transformer T1 is released, so that leakage inductance and peak voltage generated by the transformer T1 are reused, the peak voltage generated by a high-frequency switch is eliminated, the overall efficiency of the switch power supply is improved, and the defects of large electromagnetic radiation and low energy efficiency of the conventional high-frequency switch power supply are overcome.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. A high-frequency switch power supply is characterized by comprising a high-frequency switch circuit and an energy regeneration circuit, wherein the input end of the high-frequency switch circuit is connected with a high-voltage power supply and a control port, the input end of the energy regeneration circuit is connected with the control port, and the high-frequency switch circuit and the energy regeneration circuit are mutually connected; the control port is used for outputting a level signal so as to control the high-frequency switch circuit and the energy regeneration circuit; the energy regeneration circuit comprises a MOS tube Q2 and a capacitor C1, the MOS tube Q2 and the capacitor C1 are both connected with the high-frequency switch circuit, and the MOS tube Q2 is used for controlling the charging and discharging of the capacitor C1 according to a level signal of the control port.
2. The high frequency switch power supply according to claim 1, wherein the high frequency switch circuit comprises a transformer T1 and a switch Q1, the transformer T1 comprises an a pin and a B pin, the a pin of the transformer T1 is connected to the high voltage power supply via the capacitor C1, the B pin of the transformer T1 is connected to the MOS Q2, and the switch Q1 is connected to the control port, the transformer T1 and the MOS Q2.
3. The high-frequency switch power supply according to claim 2, wherein a gate of a MOS transistor Q2 in the energy regeneration circuit is connected to the control port, a source of the MOS transistor Q2 is connected to a B pin of the transformer T1, and a drain of the MOS transistor Q2 is connected to the switch transistor Q1.
4. The high frequency switch power supply according to claim 3, wherein a capacitor C1 in said energy regeneration circuit connects pin 6 and pin A of said transformer T1, and when said switch transistor Q1 is turned off and the transformer T1 is in reverse direction, a diode in said MOS transistor Q2 charges said capacitor C1 through pin A and pin B of the transformer.
5. The high-frequency switching power supply according to claim 3, further comprising a current detection circuit, wherein the current detection circuit comprises a resistor R7, a resistor R8, a resistor R9 and a resistor R10, a uniform end of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 is connected with the capacitor C3 and the switch tube Q1, and the other ends of the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are all grounded.
6. The high-frequency switching power supply according to claim 2, further comprising an output filter circuit, an input terminal of said output filter circuit being connected to an input terminal of said high-frequency switching circuit, an output terminal of said output filter circuit being grounded.
7. The high-frequency switching power supply according to claim 6, wherein the output filter circuit comprises an electrolytic capacitor EC2, a diode D3 and a capacitor C5, wherein the anode of the diode D3 is connected to the 11 th pin and the 12 th pin of the transformer T1, the cathode of the diode D3 is connected to the electrolytic capacitor EC2 and the capacitor C5, and the other ends of the capacitor C5 and the electrolytic capacitor EC2 are grounded; after the switching tube Q1 is turned off, the 11 th pin and the 12 th pin of the transformer T1 charge the electrolytic capacitor EC 2.
8. The high-frequency switching power supply according to claim 5, wherein the gate of the switching transistor Q1 is connected to the control port, the drain of the switching transistor Q1 is connected to the drain of the MOS transistor and the 4 th pin of the transformer T1, and the source of the switching transistor Q1 is grounded via the current detection circuit; and the source and the drain of the switching tube Q1 are respectively connected with two ends of the capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122636951.6U CN216672858U (en) | 2021-10-29 | 2021-10-29 | High-frequency switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122636951.6U CN216672858U (en) | 2021-10-29 | 2021-10-29 | High-frequency switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216672858U true CN216672858U (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122636951.6U Active CN216672858U (en) | 2021-10-29 | 2021-10-29 | High-frequency switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216672858U (en) |
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2021
- 2021-10-29 CN CN202122636951.6U patent/CN216672858U/en active Active
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