A power module with compatible input and adjustable output

Abstract

The utility model discloses a power supply module with input compatible and adjustable output, which belongs to the field of output power supply module, including a power supply input interface, a PWM control chip and a power supply output end; one end of the power supply input interface is connected to an external power supply, and the other end of the power supply input interface is connected to an EMI and lightning protection circuit input end; the EMI and lightning protection circuit output end is connected to a rectifier bridge, a voltage-dividing capacitor group, an RCD absorption circuit, and a PWM control chip in sequence; the auxiliary winding of the transformer is connected to a voltage-stabilizing circuit, and the voltage-stabilizing circuit is connected to a PWM control chip; the transformer is connected to one end of a diode RC, and the other end of the diode RC is connected to a first voltage-stabilizing chip, a second voltage-stabilizing chip, a step-down chip, and an adjustable resistor in sequence, and the other end of the adjustable resistor is connected to the power supply output end. The utility model is compatible with multiple inputs of external power supplies, suitable for most working conditions, and the adjustable output flexibly meets the voltage of most equipment, reduces preparation costs, improves installation effects and efficiency, and ensures safety.

Description

Technical Field

[0001] The utility model relates to the field of output power modules, in particular to a power module with compatible input and adjustable output. Background Art

[0002] Switching power supply, i.e. output power supply, has entered a mature and stable stage since the beginning of the 21st century. Currently, the mainstream is divided into two factions, namely silicon carbide and gallium nitride. After the output power is processed by the rectification and filtering circuit, the AC voltage is successfully converted into DC voltage, but it still contains certain pulse clutter signals. Subsequently, this DC voltage is sent to the high-frequency converter and converted into a square wave signal of the required voltage value. To ensure voltage stability, the square wave voltage is rectified and filtered again. The control core of the entire process is the pulse width modulator, and its key components include samplers, comparators, oscillators, pulse width modulators and reference voltage circuits to ensure the accuracy and stability of voltage conversion. The sampler collects the output voltage information in real time, and after comparing it with the preset reference voltage through the comparator, adjusts the oscillator to control the pulse width modulation, thereby achieving the stability of the output voltage.

[0003] When the existing switch cabinet is used under normal working conditions, the voltage levels required by the equipment in the cabinet are different, and the equipment will be replaced according to the working conditions. When the equipment is replaced, the switching power supply often needs to be replaced as well. Because the input and output voltage levels of the switching power supplies on the market are fixed, this leads to the need to purchase many switching power supplies of different specifications, which easily increases the manufacturing resources of the switching power supply, makes installation troublesome, and affects the effect of the installation work. Utility Model Content

[0004] With regard to the above problems existing in the prior art, the purpose of the present invention is to provide a power supply module with compatible input and adjustable output, so as to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A power supply module with compatible input and adjustable output includes a power supply input interface, a PWM control chip and a power supply output terminal; one end of the power supply input interface is connected to an external power supply, and the other end of the power supply input interface is connected to an EMI and lightning protection circuit input terminal;

[0007] The output end of the EMI and lightning protection circuit is connected to the input end of the rectifier bridge, the output end of the rectifier bridge is connected to one end of the voltage-dividing capacitor group, the other end of the voltage-dividing capacitor group is connected to the input end of the RCD absorption circuit, and the output end of the RCD absorption circuit is connected to the PWM control chip; the auxiliary winding of the transformer is connected to the voltage-stabilizing circuit, and the voltage-stabilizing circuit is connected to the PWM control chip;

[0008] The RCD absorption circuit is connected to one end of the first short-circuit protection circuit, and the other end of the first short-circuit protection circuit is connected to the PWM control chip;

[0009] The transformer is connected to one end of the diode RC, the other end of the diode RC is connected to the input end of the first voltage stabilizing chip, the output end of the first voltage stabilizing chip is connected to the input end of the second voltage stabilizing chip, the output end of the second voltage stabilizing chip is connected to the input end of the step-down chip, the output end of the step-down chip is connected to one end of the adjustable resistor, and the other end of the adjustable resistor is connected to the output end of the power supply;

[0010] One end of the second short-circuit protection circuit is connected to the step-down chip, and the other end of the second short-circuit protection circuit is connected to the indicating blue light.

[0011] As a further solution of the utility model: the power input interface includes a live wire input interface, a neutral wire input interface, and a ground input interface.

[0012] As a further solution of the utility model: the power output end includes an output negative electrode and an output positive electrode, and the output negative electrode and the output positive electrode are provided with two groups.

[0013] As a further solution of the utility model: the voltage-dividing capacitor group is two capacitor groups connected in series.

[0014] As a further solution of the utility model: the sampling resistor of the RCD absorption circuit is connected to the PWM control chip.

[0015] As a further solution of the utility model: the starting resistor of the RCD absorption circuit is connected to the first short-circuit protection circuit.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The input end of the utility model is designed to be a 110V-440Vac wide voltage input, which is compatible with the input of an external power supply and is suitable for most working scenarios. It is an adaptive input and does not require any settings. It can be directly connected to the site for use. The rated power is 50W, which meets the needs of most equipment. The output is designed to be an adjustable 5-24Vdc output, which can flexibly meet the voltage of most equipment. Even for special voltage levels, the voltage output can be temporarily adjusted to ensure use, which greatly reduces the manufacturing resources of the switching power supply, reduces the need to prepare templates for the switching power supply, reduces the styles of the switching power supply, and facilitates subsequent installation. There is no need to find the switching power supply corresponding to the input and output every time an installation is performed, thereby improving the installation effect and efficiency and ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a circuit principle block diagram of a power supply module with compatible input and adjustable output disclosed in an embodiment.

[0019] Figure 2 A schematic diagram of the PCB circuit board structure of a power supply module with compatible input and adjustable output disclosed in an embodiment.

[0020] The reference numerals in the figure are: 1. Live wire input interface; 2. Neutral wire input interface; 3. Ground input interface; 4. Output negative pole; 5. Output positive pole; 6. EMI and lightning protection circuit; 7. Rectifier bridge; 8. Voltage-dividing capacitor group; 9. RCD absorption circuit; 10. PWM control chip; 11. First short-circuit protection circuit; 12. Transformer; 13. Voltage stabilizing circuit; 14. Diode RC; 15. First voltage stabilizing chip; 16. Second voltage stabilizing chip; 17. Step-down chip; 18. Second short-circuit protection circuit; 19. Indicator blue light; 20. Adjustable resistor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] See also Figure 1-2 , a power supply module with input compatible and adjustable output, comprising a power supply input interface, a PWM control chip 10 and a power supply output terminal; one end of the power supply input interface is connected to an external power supply, and the other end of the power supply input interface is connected to an input end of an EMI and lightning protection circuit 6; the EMI and lightning protection circuit 6 filters out various interference signals coming from a power grid, and prevents high-frequency signals formed by a power switch circuit from polluting the power grid, and prevents direct contact voltage from causing damage to the device, thereby increasing safety;

[0024] The output end of the EMI and lightning protection circuit 6 is connected to the input end of the rectifier bridge 7, the output end of the rectifier bridge 7 is connected to one end of the voltage-dividing capacitor group 8, the other end of the voltage-dividing capacitor group 8 is connected to the input end of the RCD absorption circuit 9, and the output end of the RCD absorption circuit 9 is connected to the PWM control chip 10; the auxiliary winding of the transformer 12 is connected to the voltage-stabilizing circuit 13, and the voltage-stabilizing circuit 13 is connected to the PWM control chip 10; the input 380V AC power of the external power supply passes through the EMI and lightning protection circuit 6, and then passes through the rectifier bridge 7 to become 540V, and the voltage-dividing capacitor group 8 divides the voltage, and after being absorbed by the RCD absorption circuit 9, it is transmitted to the PWM chip 10, and the RCD absorption circuit 9 absorbs instantaneous overvoltage and overcurrent to protect the circuit from voltage fluctuations; the PWM control chip 10 facilitates the operation of the control circuit. At this time, the auxiliary winding 12 has a 16V induced voltage, which is stabilized to 14V by the voltage-stabilizing circuit 13 and sent to the PWM control chip 10.

[0025] The RCD absorption circuit 9 is connected to one end of the first short-circuit protection circuit 11, and the other end of the first short-circuit protection circuit 11 is connected to the PWM control chip 10; when the output is short-circuited, the auxiliary power supply is pulled down, and the PWM control chip 10 enters the hiccup mode. At this time, the first short-circuit protection circuit 11 starts to work, and the power supply is supplied by the starting resistor. When the overvoltage protection exceeds the output voltage of 30V, the voltage stabilizing circuit 13 is turned on, and the PWM control chip 10 is pulled down to enter the protection mode.

[0026] The transformer 12 is connected to one end of the diode RC14, the other end of the diode RC14 is connected to the input end of the first voltage stabilizing chip 15, the output end of the first voltage stabilizing chip 15 is connected to the input end of the second voltage stabilizing chip 16, the output end of the second voltage stabilizing chip 16 is connected to the input end of the step-down chip 17, the output end of the step-down chip 17 is connected to one end of the adjustable resistor 20, and the other end of the adjustable resistor 20 is connected to the output end of the power supply; after the transformer 12 starts working, the current is absorbed by the diode RC14, enters the first voltage stabilizing chip 15 and the second voltage stabilizing chip 16, and outputs a 15V voltage, and then passes through the synchronous step-down chip 17 to obtain a stable adjustable output voltage, which can be adjusted by the adjustable resistor 20 to obtain a 5-24V DC output.

[0027] One end of the second short-circuit protection circuit 18 is connected to the step-down chip 17, and the other end of the second short-circuit protection circuit 18 is connected to the blue indicator light 19; at the same time, the short-circuit protection circuit 18 monitors the signal output of the step-down chip 17 in real time, and performs short-circuit protection in time when a fault occurs. When the circuit works normally, the blue indicator light 19 is always on, and when a short circuit occurs, the indicator light goes out.

[0028] The power input interface includes a live wire input interface 1, a neutral wire input interface 2, and a ground input interface 3, which facilitates the device to be connected to an external 220V-380V power supply, facilitating subsequent use.

[0029] The power output end includes an output negative pole 4 and an output positive pole 5. The output negative pole 4 and the output positive pole 5 are provided in two groups, which is convenient for the output of 5V-24V power supply, ensures safety, and facilitates the use of the device.

[0030] The voltage-dividing capacitor group 8 is two capacitor groups connected in series, which is beneficial to the safety of the protection circuit.

[0031] The sampling resistor of the RCD absorption circuit 9 is connected to the PWM control chip 10, which is convenient for the safety of the circuit and conducive to the subsequent control of the output of the power supply.

[0032] The starting resistor of the RCD absorption circuit 9 is connected to the first short-circuit protection circuit 11, which facilitates the use of the device and ensures safety.

[0033] The input end of the utility model is designed to be a 110V-440Vac wide voltage input, and is compatible with 220-380V input, which is suitable for most working scenarios. It is an adaptive input and does not require any settings. It can be directly connected to the site for use. The rated power is 50W, which meets the needs of most equipment. The output is designed to be an adjustable 5-24Vdc output, which flexibly meets the voltage of most equipment. Even for special voltage levels, the voltage output can be temporarily adjusted to ensure use, which greatly reduces the manufacturing resources of the switching power supply, reduces the need to prepare templates for the switching power supply, reduces the style of the switching power supply, and is conducive to subsequent installation. There is no need to find the switching power supply corresponding to the input and output every time an installation is performed, thereby improving the installation effect and efficiency and ensuring safety.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A power supply module with compatible input and adjustable output, comprising a power supply input interface, a PWM control chip (10) and a power supply output terminal; characterized in that: One end of the power input interface is connected to the external power supply, and the other end of the power input interface is connected to the input end of the EMI and lightning protection circuit (6); The output end of the EMI and lightning protection circuit (6) is connected to the input end of the rectifier bridge (7), the output end of the rectifier bridge (7) is connected to one end of a voltage-dividing capacitor group (8), the other end of the voltage-dividing capacitor group (8) is connected to the input end of the RCD absorption circuit (9), and the output end of the RCD absorption circuit (9) is connected to the PWM control chip (10); the auxiliary winding of the transformer (12) is connected to the voltage-stabilizing circuit (13), and the voltage-stabilizing circuit (13) is connected to the PWM control chip (10); The RCD absorption circuit (9) is connected to one end of the first short-circuit protection circuit (11), and the other end of the first short-circuit protection circuit (11) is connected to the PWM control chip (10); The transformer (12) is connected to one end of a diode RC (14), the other end of the diode RC (14) is connected to an input end of a first voltage stabilizing chip (15), the output end of the first voltage stabilizing chip (15) is connected to an input end of a second voltage stabilizing chip (16), the output end of the second voltage stabilizing chip (16) is connected to an input end of a step-down chip (17), the output end of the step-down chip (17) is connected to one end of an adjustable resistor (20), and the other end of the adjustable resistor (20) is connected to an output end of a power supply; One end of the second short-circuit protection circuit (18) is connected to the voltage-reducing chip (17), and the other end of the second short-circuit protection circuit (18) is connected to the blue indicator light (19).

2. The input-compatible output-adjustable power supply module according to claim 1, characterized in that: The power input interface comprises a live line input interface (1), a neutral line input interface (2), and a ground input interface (3).

3. The input-compatible output-adjustable power supply module according to claim 2, characterized in that: The power supply output end comprises an output negative electrode (4) and an output positive electrode (5), and the output negative electrode (4) and the output positive electrode (5) are provided in two groups.

4. The input-compatible output-adjustable power supply module according to claim 3, characterized in that: The voltage-dividing capacitor group (8) is two capacitor groups connected in series.

5. The input-compatible output-adjustable power supply module according to claim 4, characterized in that: The sampling resistor of the RCD absorption circuit (9) is connected to the PWM control chip (10).

6. The input-compatible output-adjustable power supply module according to claim 5, characterized in that: The starting resistor of the RCD absorption circuit (9) is connected to the first short-circuit protection circuit (11).

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