Self-excitation push-pull converter type switching power supply

Abstract

The invention discloses a self-excitation push-pull converter type switching power supply, and relates to the technical field of high-voltage power supplies. The power supply comprises a power supply body, pins are arranged at the bottom of the power supply body, a self-excitation push-pull circuit, a switching tube and a transformer excitation winding are arranged in the power supply body, the switching tube and the transformer excitation winding form a positive feedback circuit, and the positive feedback circuit is used for driving the switching tube to be switched on and switched off. And when the transformer enters near saturation, the induced voltage of the excitation winding of the transformer is reduced, the drive is automatically reduced, and the positive feedback circuit is closed. Through the cooperative design of the self-excitation push-pull circuit and the positive feedback circuit, the circuit is mature, the transformer works in one or three quadrants simply and reliably, the utilization rate is high, energy conversion is efficient, voltage output is stable, heat loss is low and the like, the more efficient and more stable voltage boosting function can be achieved, and the power module has the DC 5V input and the DC 200V output; the use cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of high voltage power supply, and in particular to a self-excited push-pull converter type switching power supply. Background Art

[0002] High voltage power modules are devices used to provide high voltage (usually greater than 100V or even higher) electrical energy. They are usually used in applications that require stable high voltage power supply, such as laboratory research, medical equipment, industrial control, scientific instruments, plasma applications, laser systems, etc. High voltage power modules can convert the input low voltage into the required high voltage and ensure stable output.

[0003] The high-voltage modules currently used all have DC12V power input. Some devices do not have a DC12V interface but only a DC5V interface, so it is necessary to add a DC12V module to the original device, which will increase the cost of the product. In the document (application number: CN201710729837.3), a DC-DC power supply for converting high voltage to low voltage is disclosed, which includes a number of conversion circuits connected in series and parallel through voltage-dividing resistors, a 15V power supply circuit, a signal circuit, and an output short-circuit protection circuit. Each conversion circuit is connected to a high-voltage source through a voltage-dividing resistor. It includes a peak elimination unit, an oscillation unit, a rectifier and filter unit, an excitation transformer and a drive unit, each voltage-dividing resistor is connected in series, and the rectifier and filter units are connected in parallel, wherein: the voltage-dividing resistor is connected between the high-voltage source and the peak elimination unit, the oscillation unit is connected between the peak elimination unit and the rectifier and filter unit, and the excitation transformer is connected between the drive unit and the oscillation unit, and the drive unit includes the first and second drive bridge modules, the first and second drive bridge modules are connected to the signal circuit, and the 15V power supply circuit is connected between the rectifier and filter unit and the signal circuit, and the output short-circuit protection circuit is connected between the rectifier and filter unit and the 15V power supply circuit. This patent can only convert high voltage to low voltage, and an additional drive unit needs to be set up during the voltage conversion process, which has a complex structure and high energy consumption. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a self-excited push-pull converter type switching power supply.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A self-excited push-pull converter type switching power supply includes a power supply body, a pin is provided at the bottom of the power supply body, a self-excited push-pull circuit, a switch tube and a transformer excitation winding are provided inside the power supply body, the switch tube and the transformer excitation winding form a positive feedback circuit, the positive feedback circuit is used to drive the switch tube to open and close, and when the transformer is near saturation, the transformer excitation winding induced voltage decreases, the drive automatically decreases, and the positive feedback circuit is closed.

[0007] Furthermore, the outer dimensions of the power supply body are 13.2mmx13.2mmx11.5mm, the length of the pin is 4mm, the diameter is 0.5mm, and the pin consists of a first pin, a second pin, a third pin and a fourth pin. The first pin, the second pin and the third pin are respectively arranged in a triangle of the power supply body. The center distance between the first pin and the second pin is 8.89mm, the center distance between the first pin and the third pin is 8.89mm, the third pin and the fourth pin are on the same side, and the center distance between the third pin and the fourth pin is 4.45mm.

[0008] Furthermore, the surface of the power supply body is matte nickel-plated.

[0009] Furthermore, the power supply body is installed in a pin welding connection form.

[0010] Furthermore, the power supply body adopts natural heat dissipation.

[0011] Furthermore, the power supply body input voltage is: 4.5-5.5V, and the monitoring voltage is: 4.5V~5.5V.

[0012] Furthermore, the power supply body adopts input and output isolation measures.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention is designed by combining a self-excited push-pull circuit with a positive feedback circuit, and has a mature circuit, a simple and reliable transformer working in the first and third quadrants, a high utilization rate, efficient energy conversion, stable voltage output, strong starting capability, compact design and low heat loss, etc. Such a combination enables a more efficient and stable voltage boosting function to be achieved in battery-driven portable devices, power conversion systems and high-frequency oscillation applications, so that the power module of the present invention has a DC5V input and a DC200V output, and has a low cost of use.

[0015] 2. The present invention adopts a switch tube and a transformer excitation winding to form a positive feedback circuit. The positive feedback circuit is directly used to drive the switch tube to open and close. No peripheral circuit drive is required. The structure is simple. When the transformer is close to saturation, the induced voltage of the transformer excitation winding decreases, the drive automatically decreases, and the positive feedback circuit is closed, which helps to ensure the stability and reliability of the transformer system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic front view of the power supply of the present invention;

[0017] Figure 2 is a bottom view schematic diagram of the power supply of the present invention;

[0018] Figure 3 It is a schematic diagram of current and voltage waveforms of the present invention.

[0019] Figure numerals: 1, power supply body; 11, first pin; 12, second pin; 13, third pin; 14, fourth pin; 15, switch tube; 16, transformer excitation winding. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Embodiment 1, as Figure 1-Figure 3 As shown, a self-excited push-pull converter type switching power supply includes a power supply body 1, a pin is set at the bottom of the power supply body 1, and a self-excited push-pull circuit, a switch tube 15 and a transformer excitation winding 16 are set inside the power supply body 1. The switch tube 15 and the transformer excitation winding 16 form a positive feedback circuit. The positive feedback circuit is used to drive the switch tube 15 to open and close, and when the transformer is near saturation, the induced voltage of the transformer excitation winding 16 decreases, the drive automatically decreases, and the positive feedback circuit is closed.

[0022] Furthermore, the outer dimensions of the power supply body 1 are 13.2mmx13.2mmx11.5mm, the length of the pin is 4mm, the diameter is 0.5mm, the pin consists of a first pin 11, a second pin 12, a third pin 13 and a fourth pin 14, the first pin 11, the second pin 12 and the third pin 13 are respectively arranged in a triangle of the power supply body 1, the center distance between the first pin 11 and the second pin 12 is 8.89mm, the center distance between the first pin 11 and the third pin 13 is 8.89mm, the third pin 13 and the fourth pin 14 are on the same side, and the center distance between the third pin 13 and the fourth pin 14 is 4.45mm.

[0023] The power module of the present invention can realize DC5V input, DC200V output, low to high conversion, and is designed by coordinating the self-excitation push-pull circuit with the positive feedback circuit. It has a mature circuit, simple and reliable transformer working in the first and third quadrants, high utilization rate, efficient energy conversion, stable voltage output, strong starting ability, compact design and low heat loss, etc. Such a combination enables a more efficient and stable voltage boost function to be realized in battery-driven portable devices, power conversion systems and high-frequency oscillation applications. The switch tube 15 and the transformer excitation winding 16 are used to form a positive feedback circuit. The positive feedback circuit is directly used to drive the switch tube to open and close, without the need for peripheral circuit drive, and has a simple structure;

[0024] When the transformer is close to saturation, if the positive feedback circuit continues to work, it may cause unstable oscillation, over-modulation or distortion in the system. This is because the saturated transformer cannot respond to the input signal normally, resulting in distortion of the feedback signal, which in turn causes an irregular output waveform or excessive gain in the system. When the transformer of the present invention is close to saturation, the induced voltage of the transformer excitation winding 16 decreases, the drive automatically decreases, and the positive feedback circuit is closed, which helps to ensure the stability and reliability of the transformer system.

[0025] The output indicators of the power supply are shown in Table 1.

[0026] Table 1

[0027]

[0028] According to the requirements of GJBZ1391-2006 Failure Mode, Effect and Criticality Analysis Guide, combined with the failure information of similar products, the failure mode analysis of this model power module is carried out. The analysis results are shown in Table 2.

[0029] Table 2 Failure mode analysis of power module

[0030]

[0031]

[0032] Embodiment 2, based on the above embodiment, further includes that the surface of the power supply body 1 is subjected to matte nickel plating.

[0033] Embodiment 3, based on the above embodiment, further includes that the power source body 1 is installed in a pin welding connection form.

[0034] Embodiment 4, based on the above embodiment, further includes that the power supply body 1 adopts natural heat dissipation.

[0035] Embodiment 5, based on the above embodiment, further includes: input voltage of power supply body 1: 4.5-5.5V, monitoring voltage: 4.5V~5.5V.

[0036] Embodiment 6, based on the above embodiments, further includes that the power supply body 1 takes input and output isolation measures.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-excited push-pull converter type switching power supply, comprising a power supply body (1), characterized in that: The bottom of the power supply body (1) is provided with a pin, and the interior of the power supply body (1) is provided with a self-excited push-pull circuit, a switch tube (15) and a transformer excitation winding (16), the switch tube (15) and the transformer excitation winding (16) form a positive feedback circuit, the positive feedback circuit is used to drive the switch tube (15) to be turned on and off, and when the transformer is close to saturation, the induced voltage of the transformer excitation winding (16) decreases, the drive automatically decreases, and the positive feedback circuit is closed.

2. A self-excited push-pull converter type switching power supply according to claim 1, characterized in that: The outer dimensions of the power source body (1) are 13.2 mm x 13.2 mm x 11.5 mm, the length of the pin is 4 mm, and the diameter is 0.5 mm. The pins are composed of a first pin (11), a second pin (12), a third pin (13) and a fourth pin (14). The first pin (11), the second pin (12) and the third pin (13) are respectively arranged at a triangle of the power source body (1). The center distance between the first pin (11) and the second pin (12) is 8.89 mm, the center distance between the first pin (11) and the third pin (13) is 8.89 mm, the third pin (13) and the fourth pin (14) are on the same side, and the center distance between the third pin (13) and the fourth pin (14) is 4.45 mm.

3. A self-excited push-pull converter type switching power supply according to claim 1, characterized in that: The surface of the power source body (1) is subjected to a matte nickel plating treatment.

4. A self-excited push-pull converter type switching power supply according to claim 1, characterized in that: The power source body (1) is installed in a pin welding connection form.

5. The self-excited push-pull converter type switching power supply according to claim 1, characterized in that: The power source body (1) adopts natural heat dissipation.

6. A self-excited push-pull converter type switching power supply according to claim 1, characterized in that: The power supply body (1) has an input voltage of 4.5-5.5V and a monitoring voltage of 4.5V to 5.5V.

7. A self-excited push-pull converter type switching power supply according to claim 6, characterized in that: The power supply body (1) adopts input and output isolation measures.

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