Power supply conversion module

Abstract

The utility model relates to the technical field of industrial process control, in particular to a power supply conversion module. The power supply conversion module comprises an EMI filter circuit, a rectification filter circuit, an active power factor correction circuit, a high-frequency converter, a PWM control circuit, a CPU module and the like. Wherein the PWM control circuit forms closed-loop feedback by receiving an instruction of the CPU module or judging a sampling value of a secondary side output voltage, and then generates a pulse width modulation signal for controlling the active power factor correction circuit and the high-frequency converter so as to keep the output voltage stable; the CPU module is used for monitoring the state of the power supply module, sending a control instruction to the PWM control circuit, and reporting data to a main device through the RS232 communication module. The power supply conversion module provided by the utility model has the characteristics of stable output, input overvoltage and undervoltage protection, output overvoltage and undervoltage protection, output overcurrent protection, over-temperature protection and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial process control, and in particular relates to a power conversion module. Background Art

[0002] Industrial power supplies play an important role in industrial automation control systems. PLCs (Programmable Logic Controllers) and other controllers require reliable power supplies to support their stable operation. However, most power modules have the problem of low conversion efficiency. Utility Model Content

[0003] In order to solve the problem of low conversion efficiency of a power module, the utility model provides a power conversion module.

[0004] The utility model provides a power conversion module, comprising:

[0005] The EMI filter circuit is a low-pass filter circuit composed of metallized polypropylene film capacitors, inductors, and ceramic capacitors. It has a greater inhibitory effect on high-frequency common-mode noise and differential-mode noise.

[0006] The rectifier and filter circuit adopts full-bridge rectification and inductor filtering, which is used to convert AC voltage into pulsating DC voltage;

[0007] Active power factor correction circuit, using a continuous current mode boost control type, which is used to raise the DC voltage;

[0008] A high frequency converter, which is used to transform the voltage to obtain the required output voltage;

[0009] A secondary side rectification and filtering circuit, which is used to filter and shape the required output voltage;

[0010] The output control circuit uses mechanical switches and power MOSFETs to control the on and off of the output;

[0011] The PWM control circuit forms a closed-loop feedback by receiving instructions from the CPU module or judging the sampled value of the secondary side output voltage, and then generates a pulse width modulation (PWM) signal for controlling the active power factor correction circuit and the high-frequency converter circuit to keep the output voltage stable;

[0012] An indicator light module, which is used to indicate the status of the power module;

[0013] RS232 communication module, which is used for communication between CPU module and main equipment;

[0014] The CPU module is used to detect the power input voltage, output voltage, output current and module temperature, send control instructions to the PWM control circuit to adjust the output voltage value, and report the data to the main device through the RS232 communication module;

[0015] An auxiliary power supply circuit, composed of a switching power supply, is used to provide a low-voltage stable DC reference source for the CPU module, the indicator light module and the RS232 module;

[0016] An input voltage sampling circuit, which is used to collect input voltage values ​​and report the collection results to the CPU module;

[0017] An output voltage sampling circuit a is used to collect the output voltage value after secondary side rectification and report the collected result to the PWM control circuit;

[0018] An output voltage sampling circuit b is used to collect the output voltage value and report the collection result to the CPU module;

[0019] A current sampling circuit, which is used to collect the output current value and report the collection result to the CPU module;

[0020] The temperature sampling circuit uses a temperature sensor to convert the thermal signal into a voltage signal, which is used to collect the module temperature and report the collection result to the CPU module.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The power conversion efficiency is improved, the power output is stable, and the voltage regulation rate and load regulation rate are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a block diagram of a power conversion module in one embodiment of the present utility model.

[0024] Figure 2 The figure is a schematic diagram of an indicator light module in one embodiment of the present utility model. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] like Figure 1As shown in , the utility model provides a power conversion module, including: EMI filter circuit 1, rectifier filter circuit 2, active power factor correction circuit 3, high-frequency converter 4, secondary side rectifier filter circuit 5, output control circuit 6, PWM control circuit 9, indicator light module 15, RS232 communication module 16, CPU module 14, auxiliary power supply circuit 7, input voltage sampling circuit 8, output voltage sampling circuit a10, output voltage sampling circuit b12, current sampling circuit 13, temperature sampling circuit 11. Among them, EMI filter circuit 1 is used to suppress power supply noise; rectifier filter circuit 2 is used to convert AC voltage into pulsating DC voltage; active power factor correction circuit 3 is used to raise DC voltage; high-frequency converter 4 is used to transform to obtain the required output voltage; secondary side rectifier filter circuit 5 is used to filter and shape the required output voltage; output control circuit 6 is used to control the on and off of the output.

[0027] Specifically, the AC input voltage passes through the EMI filter circuit 1 that suppresses noise, and then passes through the rectifier filter circuit 2 to obtain a DC voltage of about 300V, and then passes through the active power factor correction circuit 3 to raise the DC voltage to about 385V, and then passes through the high-frequency converter 4 and the secondary side rectifier filter circuit 5 to obtain the required 24V DC output. The output control circuit 6 is used to control the on and off of the 24V DC output.

[0028] In the utility model, the CPU module 14 is used to detect the power input voltage, output voltage, output current and module temperature, and send control instructions to the PWM control circuit to adjust the output voltage value; the PWM control circuit 9 forms a closed-loop feedback by receiving the CPU module instruction or judging the secondary side output voltage sampling value, and then generates a pulse width modulation (PWM) signal for controlling the active power factor correction circuit and the high-frequency converter to keep the output voltage stable; the output voltage sampling circuit a10 is used to collect the output voltage value after the secondary side rectification, and report the collection result to the PWM control circuit; the output voltage sampling circuit b12 is used to collect the output voltage value, and report the collection result to the CPU module; the current sampling circuit 13 is used to collect the output current value, and report the collection result to the CPU module; the temperature sampling circuit 11 is used for the module temperature, and reports the collection result to the CPU module.

[0029] Specifically, the CPU module 14 obtains the sampled data of the output voltage sampling circuit a12, the current sampling circuit 13, and the temperature sampling circuit 11, processes the data, and sends a control instruction to the PWM control circuit 9 according to the judgment logic. The PWM control circuit 9 receives the control instruction of the CPU module 14, and judges the sampled value of the output voltage sampling circuit a10 at the same time, and then the PWM control circuit 9 generates a pulse width modulation (PWM) signal, and adjusts the pulse duty cycle to achieve a stable DC output.

[0030] Preferably, the priority of the control instruction of the CPU module 14 is higher than the priority of the sampling value feedback of the output voltage sampling circuit a10.

[0031] In the utility model, the CPU module 16 reports data to the main device through the RS232 communication module 16; the RS232 communication module 16 is used for communication between the CPU module and the main device; the indicator light module 15 is used to indicate the status of the power module; the input voltage sampling circuit 8 is used to collect the input voltage value and report the collection result to the CPU module.

[0032] Specifically, the indicator light module 13 includes two indicator lights, a green indicator light 17 indicates that the output is normal, and a red indicator light 18 indicates that the output is abnormal. The indicator lights are turned on and off by the CPU module 16. When the output voltage sampling circuit b12 collects that the output voltage is within the range of 23.28V~24.72V, the green indicator light 17 is lit. When the input voltage sampling circuit 8 collects that the input voltage is not within the range of 176V~264V, the output voltage sampling circuit b12 collects that the output voltage is not within the range of 23.28V~24.72V, the temperature sampling circuit 11 samples a temperature value>105℃, and the current sampling circuit 13 collects a current value>4.2A, the red indicator light 18 is lit.

[0033] In the utility model, the auxiliary power supply circuit is composed of a switching power supply, which is used to provide a 5V DC reference source to the CPU module 14, the indicator light module 15 and the RS232 module 16.

[0034] The present invention is not limited to the above-mentioned embodiments, and any obvious improvements or changes to the above-mentioned embodiments made by those skilled in the art will not exceed the concept of the present invention and the protection scope of the appended claims.

Claims

1. A power conversion module, characterized in that: include: EMI filter circuit, rectifier filter circuit, active power factor correction circuit, high-frequency converter, secondary side rectifier filter circuit, output control circuit, PWM control circuit, indicator light module, RS232 communication module, CPU module, auxiliary power supply circuit, input voltage sampling circuit, output voltage sampling circuit a, output voltage sampling circuit b, current sampling circuit, temperature sampling circuit, The EMI filter circuit is used to suppress the noise at the input end of the power module; The rectifier and filter circuit is used to convert the AC voltage into a pulsating DC voltage; The active power factor correction circuit is used to raise the DC voltage; The high frequency converter is used for voltage transformation to obtain the required output voltage; The secondary side rectifying and filtering circuit is used to filter and shape the required output voltage; The output control circuit is used to control the on and off of the output; The PWM control circuit is used to control the active power factor correction circuit and the high-frequency converter to keep the output voltage stable; The indicator light module is used to indicate the status of the power module; The RS232 communication module is used for communication between the CPU module and the main device; The CPU module is used to detect the power input voltage, output voltage, output current and module temperature, send control instructions to the PWM control circuit to adjust the output voltage value, and report the data to the main device through the RS232 communication module; The auxiliary power supply circuit is used to provide a low-voltage stable DC reference source for the CPU module, the indicator light module and the RS232 communication module; The input voltage sampling circuit is used to collect input voltage values ​​and report the collected results to the CPU module; The output voltage sampling circuit a is used to collect the output voltage value of the secondary side rectification and filtering circuit, and report the collection result to the PWM control circuit; The output voltage sampling circuit b is used to collect the output voltage value and report the collection result to the CPU module; The current sampling circuit is used to collect the output current value and report the collection result to the CPU module; The temperature sampling circuit is used to collect module temperature and report the collected result to the CPU module.

2. A power conversion module according to claim 1, characterized in that: The EMI filter circuit is a low-pass filter circuit composed of metallized polypropylene film capacitors, inductors, and ceramic capacitors, and has a greater inhibitory effect on common-mode noise and differential-mode noise with higher frequencies.

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