CN218416199U

CN218416199U - General type switching power supply secondary tube peak quasi-lossless active absorption circuit

Info

Publication number: CN218416199U
Application number: CN202222820876.3U
Authority: CN
Inventors: 陈健斌; 陈凯; 王进通; 张城东
Original assignee: Guangdong Titan Intelligent Power Co ltd
Current assignee: Guangdong Titan Intelligent Power Co ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-01-31
Anticipated expiration: 2032-10-26

Abstract

The utility model discloses and provides a can absorb the peak energy on being responsible for well, and with the general type switching power supply secondary tube peak quasi-lossless active absorption circuit of peak voltage clamp to very low degree. The utility model discloses a elementary absorption circuit, main switch pipe, the main switch pipe with elementary absorption circuit electricity is connected, its characterized in that: the switch also comprises a diode and a capacitor, wherein the diode and the capacitor are connected in series and then are connected in parallel with the main switch tube. The utility model is suitable for a high-power bidirectional power supply's production design field.

Description

General type switching power supply secondary tube peak quasi-lossless active absorption circuit

Technical Field

The utility model relates to a quasi-lossless active absorption circuit of general type switching power supply secondary tube peak.

Background

With the expansion of the use of green energy sources such as solar energy, wind energy, energy storage power stations and the like, the number of high-power bidirectional power supplies matched with the solar energy, wind energy, energy storage power stations and the like is increased, in order to ensure the bidirectional energy flow, the secondary rectifier diodes of the power supplies usually adopt MOS (metal oxide semiconductor) tubes or IGBT (insulated gate bipolar transistor), the reverse recovery performance of the body diodes of the tubes is usually not ideal, the larger reverse recovery current can excite a very high reverse voltage peak on the secondary rectifier tube (switching tube), and the total energy of the peak is usually as high as hundreds of watts or more.

Current rectifier anti-peak solutions are generally divided into passive snubber circuits, and active clamp circuits. Although the passive absorption circuit has a simple structure, the passive absorption circuit has obvious defects, mainly because the power consumption is extremely high, and the reliability completely depends on the heat dissipation condition of the absorption circuit, so that the installation volume is huge. Although the active clamping circuit has good absorption effect and low power consumption, one defect is that the capacitor can resonate with the main circuit when the absorption control tube is switched on to form unnecessary oscillation to cause the waveform abnormality of the main circuit, and the oscillation can release extra electromagnetic interference; another drawback is that when the main tube has a large duty ratio, the absorption control tube has almost no enough on-time, the absorption capacitor discharge is blocked, and the peak absorption function may fail, and the third problem is that the absorption control switch tube needs a body diode with excellent high voltage resistance, which results in few selectable models and high price, and the driving control sequence is also complicated and difficult.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, provide one kind and can absorb the peak energy on being responsible for well, and with the general type switching power supply secondary pipe peak quasi-lossless active absorption circuit of peak voltage clamp to very low degree.

The utility model discloses a primary absorption circuit, main switch pipe, diode and electric capacity, the main switch pipe with the primary absorption circuit electricity is connected, the diode and behind the electric capacity series connection with the main switch pipe is parallelly connected.

The anode of the diode is respectively electrically connected with the main switch tube and the primary absorption circuit, and the cathode of the diode is electrically connected with the capacitor.

The number of the diodes corresponds to the number of the main switching tubes, and one diode is adaptive to correspond to one main switching tube.

The diode is a silicon carbide diode.

Has the beneficial effects that: through the utility model discloses, the person in charge peak voltage that is connected with elementary absorption circuit passes through the carborundum diode, introduces absorption capacitance on, because of the electric capacity is great, is responsible for the peak energy and can only raise electric capacity voltage tens of volts, fine absorption the peak energy on being responsible for, and will reverse peak voltage clamp to very low degree. The energy on the capacitor can be transmitted back to the primary side of the main circuit through an external half-bridge (or forward) switching circuit or used for supplying power to a system fan, so that quasi-lossless absorption of the energy is realized. By controlling the duty ratio of the absorption circuit and the turn ratio of the transformer, the lowest value of the voltage on the absorption capacitor can be controlled, and the normal working voltage of the secondary can not be transmitted back to the primary. Therefore, the utility model has the advantages of it is following: the inverse peak energy is basically recycled without damage, and the overall heating reduction efficiency of the power supply is improved; the number of absorption points and the absorption power are flexible and adjustable, and the peak leading-in diode number and the topological form of a post-stage circuit can be used for extremely wide power levels and various topological structures as long as the peak leading-in diode number and the topological form of the post-stage circuit are adjusted; the absorption circuit is separated from the main circuit, so that the absorption circuit is not influenced by the duty ratio of the main circuit, and the driving control is simple; the heating is small, the installation is flexible and convenient, and the device can be installed at almost any position in the system; since the peak energy is introduced into the absorption/clamping capacitor through the silicon carbide diode with very good reverse performance, the absorption capacitor will not cause additional oscillation basically.

Drawings

Fig. 1 is a schematic circuit diagram of the external half-bridge switching power supply circuit of the present invention.

Detailed Description

As shown in fig. 1, the utility model discloses a primary absorption circuit, main switch pipe, the main switch pipe with the primary absorption circuit electricity is connected, the utility model discloses still include diode and electric capacity, the diode and after the electric capacity is established ties with the main switch pipe is parallelly connected. The anode of the diode is respectively electrically connected with the main switching tube and the primary absorption circuit, and the cathode of the diode is electrically connected with the capacitor. The number of the diodes corresponds to the number of the main switching tubes, and one diode is adaptive to one main switching tube. If the number of the main switching tubes is larger, more diodes can be introduced.

In this embodiment, the main switch tube includes main switch tube M2 and main switch tube M3, the diode include with main switch tube M2 corresponds parallelly connected diode D2 and with main switch tube M3 corresponds parallelly connected diode D1, the electric capacity is electric capacity C1 and electric capacity C3 respectively, electric capacity C1 with electric capacity C3 establishes ties.

The diode D1, the capacitor C1 and the capacitor C3 are sequentially connected in series and then connected with the main switch tube M3 in parallel, the anode of the diode D1 is electrically connected with the primary absorption circuit and the main switch tube M3 respectively, and the cathode of the diode D1 is electrically connected with the C1.

The diode D2, the capacitor C1 and the capacitor C3 are connected in series and then connected with the main switching tube M2 in parallel, the anode of the diode D2 is respectively electrically connected with the primary absorption circuit and the main switching tube M2, and the cathode of the diode D2 is electrically connected with the C1.

The peak voltages of the main switching tube M2 and the main switching tube M3 are respectively introduced to the capacitor C1 and the capacitor C3 through the diode D2 and the diode D1, and because the capacities of the capacitor C1 and the capacitor C3 are large, the peak energy of the main switching tube M2 and the main switching tube M3 can only raise the voltages of the capacitor C1 and the capacitor C3 by dozens of volts, so that the peak energy of the main switching tube M2 and the main switching tube M3 is well absorbed, and the peak-reverse clamping voltage is very low. The energy on the capacitor C1 and the capacitor C3 is transmitted back to the primary side of the main circuit through a half-bridge (or forward) switching circuit or is used for supplying power to a system fan, and quasi-lossless absorption of the energy is realized. The lowest value of the voltage on the absorption capacitor can be controlled by controlling the duty ratio of the absorption circuit and the turn ratio of the transformer, and the normal working voltage of the secondary can be ensured not to be transmitted back to the primary.

In this embodiment, the capacitor C1, the capacitor C3, the switching tube M1, and the switching tube M4 form a half-bridge switching power supply circuit, and the half-bridge switching power supply circuit is electrically connected to an external electrical appliance circuit, so as to realize recycling of absorbed energy.

The utility model is suitable for a high-power bidirectional power supply's production design field.

Claims

1. The utility model provides a general type switching power supply secondary tube peak quasi-lossless active absorption circuit, includes elementary absorption circuit, main switch pipe with elementary absorption circuit electricity is connected, its characterized in that: the high-voltage switch also comprises a diode and a capacitor, wherein the diode and the capacitor are connected in series and then are connected with the main switch tube in parallel.

2. The peak quasi-lossless active absorption circuit for the secondary transistor of the general-purpose switching power supply as claimed in claim 1, wherein: the anode of the diode is respectively electrically connected with the main switching tube and the primary absorption circuit, and the cathode of the diode is electrically connected with the capacitor.

3. The peak quasi-lossless active absorption circuit for the secondary transistor of the general-purpose switching power supply as claimed in claim 2, wherein: the number of the diodes corresponds to the number of the main switching tubes, and one diode is adaptive to one main switching tube.

4. The general-purpose switching power supply secondary transistor spike quasi-lossless active absorption circuit according to claim 1, wherein: the diode is a silicon carbide diode.