CN216162633U

CN216162633U - Inversion low-voltage isolation power supply

Info

Publication number: CN216162633U
Application number: CN202121713415.5U
Authority: CN
Inventors: 戴金红
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-04-01
Anticipated expiration: 2031-07-27

Abstract

The utility model discloses an inversion low-voltage isolation power supply, which comprises a transformer magnetic core, a transformer power supply and a power supply, wherein a primary winding and a secondary winding are arranged on the transformer magnetic core; the primary winding is used as an inner layer, and the secondary winding is used as an outer layer; the head end and the tail end of the primary winding are connected with an inverter power supply; the lead A of the secondary winding is connected with a first group of rectifier tubes, the lead B of the secondary winding is connected with a second group of rectifier tubes, and leads C and D respectively connected out of the first group of rectifier tubes and the second group of rectifier tubes are connected with a positive output end serving as direct-current voltage; and a center tap lead E is led out between the lead A and the lead B and is connected with a negative output end serving as direct-current voltage. The full-wave rectifying circuit made of the half-turn coil of the secondary winding outputs direct-current voltage which is half of that of the full-wave rectifying circuit with one-turn coil as the secondary winding, and if the power of the transformer is constant, the current of the full-wave rectifying circuit is doubled. The circuit form solves the power supply problems of a plurality of low voltage and large current, and various technical indexes are excellent through practical application.

Description

Inversion low-voltage isolation power supply

Technical Field

The utility model relates to the technical field of inverter power supply equipment, in particular to an inverter low-voltage isolation power supply with low-voltage output.

Background

The existing inverter power supply mainly rectifies and filters three-phase or single-phase power grid voltage, then converts the rectified and filtered voltage into required frequency output through power inversion, inputs the required frequency output into a primary coil of an isolation transformer, inductively outputs the required voltage from a secondary coil of the transformer, and finally rectifies the voltage and outputs the voltage for a load. Generally, the adopted post-stage rectification generally adopts full-wave rectification, bridge rectification and the like, if the frequency of inversion is high, for example, up to tens of KHZ, the number of primary coil turns is small (the number of transformer coil turns is inversely proportional to the frequency, the transformer has the same magnetic core, the number of turns is smaller when the frequency is higher), even if the secondary coil only uses one turn, the voltage is too high (such as electroplating power supply, resistance welding power supply and the like), the conventional method is to increase the number of primary turns to reduce the secondary voltage, but if the number of primary turns is increased too much, the efficiency and the like of the transformer are reduced, of course, a plurality of small transformers are used for rectification and then are connected in parallel at the direct current end, and the manufacturing process, the manufacturing cost, the reliability and the like are not unreasonable.

SUMMERY OF THE UTILITY MODEL

The utility model provides an inversion low-voltage isolation power supply which overcomes the defects of power supply voltage transformation and rectification, adopts a half-turn winding method of a secondary winding without changing the number of primary turns, and is matched with a scheme of full-wave rectification circuit output, and can effectively reduce the output voltage by half, increase the output current by one time under the condition of unchanged power and realize low voltage and large current.

In order to solve the technical problem, the technical scheme adopted by the utility model is that the inversion low-voltage isolation power supply comprises a transformer magnetic core, wherein a primary winding and a secondary winding are arranged on the transformer magnetic core; the primary winding is used as an inner layer, and the secondary winding is used as an outer layer; the head end and the tail end of the primary winding are connected with an inverter power supply; the lead A of the secondary winding is connected with a first group of rectifier tubes, the lead B of the secondary winding is connected with a second group of rectifier tubes, and leads C and D respectively connected out of the first group of rectifier tubes and the second group of rectifier tubes are connected with a positive output end serving as direct-current voltage; and a center tap lead E is led out between the lead A and the lead B and is connected with a negative output end serving as direct-current voltage.

In the technical scheme, the lead A is output after rectification, so that the voltage of a coil of one turn is not formed when the lead E of the center tap is led out for output, but is one half of the voltage of one turn; similarly, the lead B is also output after rectification, and when the lead E of the center tap is led out and output, the voltage of a coil of one turn is not formed, but is one half of the voltage of one turn; therefore, the full-wave rectification circuit made of the half-turn coil of the secondary winding outputs one-half of the output voltage of the full-wave rectification circuit with the secondary being one-turn coil, and if the power of the transformer is constant, the current is doubled. The circuit form solves the power supply problems of a plurality of low voltage and large current, and various technical indexes are excellent through practical application. In particular to a low-voltage large-current output power supply in the field of high-frequency power supplies, such as a low-voltage electroplating power supply, a high-frequency resistance welding power supply and the like.

Preferably, the secondary winding is composed of two half turns, wherein the wire a forms a first group of half turn windings from the connection position with the first group of rectifier tubes to a tail end X, the wire B forms a second group of half turn windings from the connection position with the second group of rectifier tubes to a head end Y, and the tail end X, the head end Y and the center tap wire E are connected.

Preferably, the transformer core is a zigzag core.

Preferably, said first set of half turn windings, i.e. first half turn coils, is formed by said wire a through the core window to said tail end X; the head end Y penetrates through another window of the magnetic core to the lead B to form the second group of half-turn windings, namely a second half-turn coil; and the tail end X of the first group of half-turn windings is connected with the head end Y of the second group of half-turn windings to form a center tap of the secondary winding, and the center tap lead E is used as a negative output end of direct current voltage.

The tail end X of the first group of half-turn windings is connected with the head end Y of the second group of half-turn windings to form a center tap of the secondary winding, namely a negative output end of the direct-current voltage; the lead A of the first group of half-turn windings and the lead B of the second group of half-turn windings are respectively connected with a group of rectifier tubes, and the rectified leads are connected with the positive pole of the output end of direct-current voltage. Because the conducting wire A of the first winding is output after rectification, the conducting wire A and the tail end X do not form the voltage of a coil of one turn but form the voltage of one half turn when output, and similarly, because the conducting wire B of the second group of half turn windings is output after rectification, the conducting wire B and the head end Y do not form the voltage of a coil of one turn but form the voltage of one half turn.

Preferably, the transformer core is a ring core or a square core.

Preferably, said first set of half turn windings, i.e. first half turn coils, is formed by said wire a through the core window to said tail end X; the head end Y winds the magnetic core to the lead B to form a second group of half-turn windings, namely a second half-turn coil; and the tail end X of the first group of half-turn windings is connected with the head end Y of the second group of half-turn windings to form a center tap of the secondary winding, and the center tap lead E is used as a negative output end of direct current voltage.

Preferably, the first group of rectifier tubes and/or the second group of rectifier tubes comprise diodes; the lead A is connected with the anode of the diode, and the lead C is connected with the cathode of the diode; the lead B is connected with the anode of the diode, and the lead D is connected with the cathode of the diode.

Drawings

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings:

FIG. 1 is a schematic diagram of a transformer with a magnetic core shaped like a Chinese character 'ri' for an inverter low-voltage isolated power supply according to the present invention;

FIG. 2 is a schematic diagram of a square-shaped magnetic core transformer structure of the inverter low-voltage isolated power supply of the present invention;

wherein: 1-primary winding, 2-secondary winding, 201-first group of half-turn windings, 202-second group of half-turn windings, 3-first group of rectifier tubes, 4-second group of rectifier tubes, 5-positive output end and 6-negative output end.

Detailed Description

In order to better understand the improvements of the present invention over the prior art, the following detailed description of specific embodiments of the present invention will be made, respectively.

The inverter low-voltage isolation power supply comprises a transformer magnetic core, wherein a primary winding 1 and a secondary winding 2 are arranged on the transformer magnetic core; wherein, the primary winding 1 is used as an inner layer, and the secondary winding 2 is used as an outer layer; the head end and the tail end of the primary winding 1 are connected with an inverter power supply; a lead A of the secondary winding 2 is connected with a first group of rectifier tubes 3, a lead B of the secondary winding 2 is connected with a second group of rectifier tubes 4, and leads C and D respectively connected from the first group of rectifier tubes 3 and the second group of rectifier tubes 4 are connected with a positive output end 5 serving as direct-current voltage; and a center tap lead E is led out between the lead A and the lead B and is connected with a negative output end 6 serving as direct-current voltage.

The secondary winding 2 is composed of two half turns, wherein a lead A forms a first group of half turn windings 201 from the connecting position of the first group of rectifier tubes 3 to a tail end X, a lead B forms a second group of half turn windings 202 from the connecting position of the second group of rectifier tubes 4 to a head end Y, and the tail end X, the head end Y and the center tap lead E are connected.

As shown in fig. 1, the transformer core is a zigzag core, and the first group of half-turn windings 201, i.e. first half-turn coils, are formed by the conducting wire a passing through the core window to the tail end X; the head end Y penetrates through another window of the magnetic core to the lead B to form the second group of half-turn windings 202, namely a second half-turn coil; the tail end X of the first group of half-turn windings 201 is connected with the head end Y of the second group of half-turn windings 202 to form a center tap of the secondary winding 2, and the center tap lead E is used as a negative output end 6 of direct current voltage.

As shown in fig. 2, the transformer core is a ring core or a square core, and the first group of half-turn windings 201, i.e. first half-turn coils, are formed by the conducting wire a passing through the core window to the tail end X; the second group of half-turn windings 202, namely a second half-turn coil, are formed by winding the magnetic core from the head end Y to the conducting wire B; the tail end X of the first group of half-turn windings 201 is connected with the head end Y of the second group of half-turn windings 202 to form a center tap of the secondary winding 2, and the center tap lead E is used as a negative output end 6 of direct current voltage.

As two different forms of transformer cores in fig. 1 and 2, the first group of rectifiers 3 and/or the second group of rectifiers 4 comprise diodes; the lead A is connected with the anode of the diode, and the lead C is connected with the cathode of the diode; the lead B is connected with the anode of the diode, and the lead D is connected with the cathode of the diode.

It should be noted that the inverter low-voltage isolation power supply of the embodiment is not only applicable to the high-frequency alternating current field, but also applicable to the alternating current transformation fields such as power frequency and intermediate frequency.

While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. An inversion low-voltage isolation power supply comprises a transformer magnetic core, and is characterized in that a primary winding and a secondary winding are arranged on the transformer magnetic core; the primary winding is used as an inner layer, and the secondary winding is used as an outer layer; the head end and the tail end of the primary winding are connected with an inverter power supply; the lead A of the secondary winding is connected with a first group of rectifier tubes, the lead B of the secondary winding is connected with a second group of rectifier tubes, and leads C and D respectively connected out of the first group of rectifier tubes and the second group of rectifier tubes are connected with a positive output end serving as direct-current voltage; and a center tap lead E is led out between the lead A and the lead B and is connected with a negative output end serving as direct-current voltage.

2. The isolated inverter low voltage power supply of claim 1 wherein the secondary winding is comprised of two half turns, wherein conductor a forms a first set of half turn windings from a connection location with the first set of rectifiers to a tail end X, conductor B forms a second set of half turn windings from the second set of rectifiers to a head end Y, and the tail end X, the head end Y and the center tap conductor E are connected.

3. The inverted low voltage isolated power supply of claim 2 wherein said transformer core is a zig-zag core.

4. The inverted low voltage isolated power supply of claim 3 wherein said first set of half turn windings, first half turn coils, is formed from said wire A through a core window to said tail end X; the head end Y penetrates through another window of the magnetic core to the lead B to form the second group of half-turn windings, namely a second half-turn coil; and the tail end X of the first group of half-turn windings is connected with the head end Y of the second group of half-turn windings to form a center tap of the secondary winding, and the center tap lead E is used as a negative output end of direct current voltage.

5. The inverted low voltage isolated power supply of claim 2 wherein said transformer core is toroidal or square.

6. The inverted low voltage isolated power supply of claim 5 wherein said first set of half turn windings, first half turn coils, is formed from said wire A through a core window to said tail end X; the head end Y winds the magnetic core to the lead B to form a second group of half-turn windings, namely a second half-turn coil; and the tail end X of the first group of half-turn windings is connected with the head end Y of the second group of half-turn windings to form a center tap of the secondary winding, and the center tap lead E is used as a negative output end of direct current voltage.

7. The isolated power supply of any one of claims 1 to 6, wherein the first and/or second rectifying tubes comprise diodes; the lead A is connected with the anode of the diode, and the lead C is connected with the cathode of the diode; the lead B is connected with the anode of the diode, and the lead D is connected with the cathode of the diode.