Power supply with peak power output capability

Abstract

The utility model relates to the technical field of industrial power supplies, and discloses a power supply with peak power output capability, which comprises an MCU (Microprogrammed Control Unit) chip U1 and a circuit main control core, the LDO linear voltage regulator U2 is used for stabilizing an unstable input voltage to a fixed output voltage, integrating overcurrent, overheating and short-circuit protection functions and protecting the safety of the circuit; the plurality of resistors are used for limiting the current and realizing a voltage division effect at the same time, so that overcurrent damage is prevented; the PWM control chip is a special control chip for the switching power supply and has the functions of current control, feedback control, driving pulse generation and the like; wherein a pin 7 of the MCU chip U1 is connected with a pin FB through an R16, the other end of the R16 is connected with an R17, a pin 5 of the MCU chip U1 is connected to a drive pulse pin of the PWM control chip through an R11, and a pin 6 of the MCU chip U1 is connected with an R18 through an NTC thermistor RT1. Compared with the traditional scheme, the circuit provided by the utility model has the advantages of simple circuit, low cost and flexible control.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial power supplies, in particular to a power supply with peak power output capability. Background Art

[0002] Industrial power supplies are power systems designed and manufactured specifically for industrial applications. They must meet the stringent power requirements of industrial environments, including high reliability, stability, durability, and adaptability. Industrial power supplies are widely used in automated production lines, robotics, heavy machinery, energy production, transportation, construction, and other fields. These power systems typically need to provide stable DC or AC power to drive a variety of industrial equipment and control systems. The design and manufacture of industrial power supplies require consideration of multiple factors, including power range, efficiency, heat dissipation, electromagnetic compatibility (EMC), anti-interference capabilities, safety standards, and environmental adaptability. Due to the complexity of industrial applications, industrial power supplies often require a high degree of customization to meet the specific needs of different equipment and environments.

[0003] However, in the industrial field, there are many electrical devices such as motors and relays, which consume currents twice or even higher than the rated current at the moment of startup. Therefore, industrial power supplies are designed with high peak power and low rated power to reduce volume and reduce costs. The previous control method is to use manganese copper wire to sample the output power of the switching power supply, and then amplify and compare the delay circuit, and then use the optocoupler to control the power supply to achieve peak power and overcurrent protection. This method has many circuits and complex solutions. At the same time, these components bring about the problem of high circuit cost. Therefore, technical personnel in this field provide a power supply with peak power output capability to solve the problems raised in the above background technology. Utility Model Content

[0004] The purpose of the present utility model is to solve the shortcomings of the prior art and to propose a power supply with peak power output capability. The MCU chip U1 can calculate the current allowable peak power size and time according to the load current and temperature. When the allowable peak power time is exceeded, a low-level pulse is generated through pin 4 to pull down the BO pin of the PWM chip, thereby stopping the PWM chip from working.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a power supply with peak power output capability, comprising:

[0006] MCU chip U1, the main control core of the circuit;

[0007] LDO linear regulator U2 stabilizes the unstable input voltage to a fixed output voltage and integrates overcurrent, overheating and short-circuit protection functions to protect the circuit safety;

[0008] Several resistors are used to limit the current and achieve a voltage divider effect to prevent overcurrent damage;

[0009] PWM control chip refers to a dedicated control chip for switching power supply, which has functions such as current control, feedback control, and generating drive pulses;

[0010] Among them, pin 7 of the MCU chip U1 is connected to the FB pin through R16, and the other end of R16 is connected to R17, pin 5 of the MCU chip U1 is connected to the drive pulse pin of the PWM control chip through R11, and pin 6 of the MCU chip U1 is connected to R18 through the NTC thermistor RT1;

[0011] Through the above technical solution, the MCU chip U1 can calculate the current allowable peak power size and time based on the load current and temperature. When the allowable peak power time is exceeded, a low-level pulse is generated through pin 4 to pull down the BO pin of the PWM chip, thereby stopping the PWM chip from working.

[0012] Furthermore, the 4th pin of the MCU chip U1 is connected to the BO terminal through R19;

[0013] Through the above technical solution, a low-level pulse is generated through pin 4, which pulls down the BO pin of the PWM control chip, thereby stopping the PWM chip from working.

[0014] Furthermore, the other end of R11 connected to the MCU chip U1 is connected to the second end of the LDO linear regulator U2 through R13, the first end of the LDO linear regulator U2 is connected to the VCC end, and the third end of the LDO linear regulator U2 is connected to the ground through the C2 capacitor;

[0015] Through the above technical solution, the duty cycle can be calculated by detecting the pulse of this pin.

[0016] Furthermore, pins 1 and 8 of the MCU chip U1 are respectively connected to the circuit of the third end of the LDO linear regulator U2, and pin 1 of the MCU chip U1 is connected to a 5V terminal;

[0017] The above technical solution provides a relatively stable current and reduces current fluctuations.

[0018] Furthermore, the other end of the NTC thermistor RT1 is connected to the second end circuit of the LDO linear regulator U2;

[0019] Through the above technical solution, the power supply temperature can be measured through the NTC thermistor RT1.

[0020] Furthermore, the other end of R17 is connected to the second end circuit of the LDO linear regulator U2 and is grounded;

[0021] Through the above technical solution, R17 detects the FB pin of the PEM control chip, and the load current can be calculated through the FB pin voltage.

[0022] The utility model has the following beneficial effects:

[0023] 1. Compared with the traditional solution, the present invention has the advantages of simple circuit, low cost and flexible control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a circuit diagram of a power supply with peak power output capability proposed by the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Reference Figure 1 The present invention provides an embodiment of a power supply with peak power output capability, comprising:

[0027] MCU chip U1, the main control core of the circuit;

[0028] LDO linear regulator U2 stabilizes the unstable input voltage to a fixed output voltage and integrates overcurrent, overheating and short-circuit protection functions to protect the circuit safety;

[0029] Several resistors are used to limit the current and achieve a voltage divider effect to prevent overcurrent damage;

[0030] PWM control chip refers to a dedicated control chip for switching power supply, which has functions such as current control, feedback control, and generating drive pulses;

[0031] Among them, pin 7 of the MCU chip U1 is connected to the FB pin through R16, and the other end of R16 is connected to R17. Pin 5 of the MCU chip U1 is connected to the drive pulse pin of the PWM control chip through R11. Pin 6 of the MCU chip U1 is connected to R18 through the NTC thermistor RT1. The MCU chip U1 can calculate the current allowable peak power size and time based on the load current and temperature. When the allowable peak power time is exceeded, a low-level pulse is generated through pin 4 to pull down the BO pin of the PWM chip, thereby stopping the PWM chip from working.

[0032] Pin 4 of the MCU chip U1 is connected to the BO terminal through R19. The other end of R11 connected to the MCU chip U1 is connected to the second end of the LDO linear regulator U2 through R13. The first end of the LDO linear regulator U2 is connected to the VCC terminal. The third end of the LDO linear regulator U2 is connected to ground through the capacitor C2. The duty cycle can be calculated by detecting the pulse of this pin. Pins 1 and 8 of the MCU chip U1 are respectively connected to the circuit of the third end of the LDO linear regulator U2, and pin 1 of the MCU chip U1 is connected to the 5V terminal to provide relatively stable current and reduce current fluctuations. The other end of the NTC thermistor RT1 is connected to the second end circuit of the LDO linear regulator U2. The power supply temperature can be measured through the NTC thermistor RT1. The other end of R17 is connected to the second end circuit of the LDO linear regulator U2 and grounded. R17 detects the FB pin of the PEM control chip. The load current can be calculated by the FB pin voltage.

[0033] Working principle: This utility model is a power supply with peak power output capability. The MCU chip U1 can calculate the current allowed peak power size and time according to the load current and temperature. When the allowed peak power time is exceeded, a low-level pulse is generated through pin 4 to pull down the BO pin of the PWM chip, thereby stopping the PWM chip from working.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power supply with peak power output capability, characterized in that: include: MCU chip U1, the main control core of the circuit; LDO linear regulator U2 stabilizes the unstable input voltage to a fixed output voltage and integrates overcurrent, overheating and short-circuit protection functions to protect the circuit safety; Several resistors are used to limit the current and achieve a voltage divider effect to prevent overcurrent damage; PWM control chip refers to a dedicated control chip for switching power supply, which has functions such as current control, feedback control, and generating drive pulses; Among them, pin 7 of the MCU chip U1 is connected to the FB pin through R16, and the other end of R16 is connected to R17, pin 5 of the MCU chip U1 is connected to the drive pulse pin of the PWM control chip through R11, and pin 6 of the MCU chip U1 is connected to R18 through the NTC thermistor RT1.

2. A power supply with peak power output capability according to claim 1, characterized in that: Pin 4 of the MCU chip U1 is connected to the BO terminal through R19.

3. The power supply with peak power output capability according to claim 1, wherein: The other end of R11 connected to the MCU chip U1 is connected to the second end of the LDO linear regulator U2 through R13, the first end of the LDO linear regulator U2 is connected to the VCC end, and the third end of the LDO linear regulator U2 is connected to the ground through the C2 capacitor.

4. The power supply with peak power output capability according to claim 1, wherein: Pin 1 and pin 8 of the MCU chip U1 are respectively connected to the circuit of the third end of the LDO linear regulator U2, and pin 1 of the MCU chip U1 is connected to a 5V terminal.

5. The power supply with peak power output capability according to claim 1, characterized in that: The other end of the NTC thermistor RT1 is connected to the second end circuit of the LDO linear regulator U2.

6. The power supply with peak power output capability according to claim 1, characterized in that: The other end of R17 is connected to the second end circuit of the LDO linear regulator U2 and is grounded.

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