Direct-current step-down power supply circuit and energy storage air conditioner

Abstract

The utility model provides a direct-current step-down power supply circuit and an energy storage air conditioner. The direct-current step-down power supply circuit is used for an energy storage air conditioner and comprises a step-down conversion module which is connected with direct current through the input end of the step-down conversion module and carries out voltage conversion on the direct current; the enabling module comprises a first resistor and a second resistor, the first end of the first resistor is connected with the enabling end of the step-down conversion module, the first end of the second resistor is grounded, and the second end of the first resistor and the second end of the second resistor are jointly connected to the enabling end of the power supply chip; the first resistor and the second resistor are used for calculating the range of the input voltage of the step-down conversion module so as to drive the step-down conversion module to work according to the input voltage of the step-down conversion module; and the output processing module is used for filtering high-frequency noise and harmonic waves in the voltage of the output end of the step-down conversion module. According to the circuit, through the enabling module, the step-down conversion module can be effectively protected according to the input voltage range, and the requirement of an energy storage air conditioner can be met.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits and energy storage air conditioners, and in particular to a direct current step-down power supply circuit and an energy storage air conditioner. Background Art

[0002] With the development of science and technology, the use of energy storage air conditioners is becoming more and more widespread, and the normal operation of energy storage air conditioners cannot be separated from the support of power supply. In the field of power supply technology, DC step-down power supply is an important power supply device, which can convert the input DC voltage into another DC voltage to meet different power requirements. In the field of power electronics technology, DC step-down power supply has been widely used, which can realize efficient power conversion and improve the efficiency and reliability of the power supply system.

[0003] However, in the technical field of power supply circuits, due to the complexity and diversity of electrical equipment, there is a lack of a DC step-down power supply circuit that can provide protection functions for energy storage air conditioners.

[0004] Based on this, the present application provides a DC step-down power supply circuit and an energy storage air conditioner to solve the above problems. Summary of the invention

[0005] The purpose of the present application is to solve the problem in the prior art of lacking a DC step-down power supply circuit and an energy storage air conditioner that provide protection functions and are suitable for energy storage air conditioners.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a DC step-down power supply circuit for an energy storage air conditioner, comprising:

[0008] A step-down conversion module, wherein the step-down conversion module receives direct current through its input terminal and performs voltage conversion on the direct current;

[0009] An enabling module, the enabling module comprising a first resistor and a second resistor, wherein a first end of the first resistor is connected to an input end of the buck conversion module, a first end of the second resistor is grounded, and a second end of the first resistor and a second end of the second resistor are commonly connected to an enabling end of the power chip; the first resistor and the second resistor are used to calculate an input voltage range of the buck conversion module, so as to drive the buck conversion module to work according to the input voltage of the buck conversion module;

[0010] An output processing module is used to filter out high-frequency noise and harmonics in the voltage at the output end of the buck conversion module.

[0011] In some possible implementations, the buck conversion module is a PWM controller.

[0012] In some possible implementations, the input voltage ranges from 8 VDC to 28 VDC, and the output voltage is 5 VDC.

[0013] In some possible implementations, a resistance value of the first resistor is 5.11 kΩ, and a resistance value of the second resistor is 105 kΩ.

[0014] In some possible implementations, the output processing module includes a first capacitor, a second capacitor and a first inductor; the first end of the first capacitor is connected to the start end of the buck conversion module, the second end of the first capacitor and the first end of the first inductor are commonly connected to the switch output end of the buck conversion module; the first end of the second capacitor is grounded, and the second end of the second capacitor is connected to the second end of the first inductor for output.

[0015] In some possible implementations, the output processing module further includes a third capacitor, and the third capacitor is connected in parallel with the second capacitor; the capacitance of the first capacitor is 100nf, and the capacitances of the second capacitor and the third capacitor are 22μf respectively.

[0016] In some possible implementations, a fourth capacitor is further included, a first end of the fourth capacitor is connected to the input end of the buck conversion module, and a second end of the fourth capacitor is grounded.

[0017] In some possible implementations, a fifth capacitor is further included, wherein a first end of the fifth capacitor and a first end of the fourth capacitor are commonly connected to the input end of the buck conversion module, and a second end of the fifth capacitor and a second end of the fourth capacitor are commonly connected to the ground end.

[0018] In some possible implementations, the capacitance of the fourth capacitor is 10 μf, and the capacitance of the fifth capacitor is 100 nf.

[0019] In a second aspect, the present application further provides an energy storage air conditioner, comprising a DC step-down power supply circuit as described in any one of the first aspects.

[0020] The beneficial effects of the technical solution provided by the embodiment of the present application are:

[0021] The energy storage air conditioning system requires different voltages to supply its internal components. The buck conversion module is connected to direct current through its input terminal, and performs voltage conversion on the direct current to reduce it to a voltage level suitable for the operation of the energy storage air conditioning. The function of the enabling module is to drive the operation of the buck conversion module according to the input voltage of the buck conversion module. Through the connection method of the first resistor and the second resistor, the buck conversion module can be disabled to protect the entire circuit when the input voltage of the buck conversion module is out of range. The output processing module is used to filter out high-frequency noise and harmonics in the voltage at the output end of the buck conversion module to avoid the output of noise and harmonics caused by the switching of the internal switching elements of the buck conversion module or due to interference in the external environment of the circuit. By filtering out noise and harmonics, the output processing module ensures the quality and stability of the output voltage.

[0022] Through the enabling module, the buck conversion module can be effectively protected according to the input voltage range, which improves the stability and reliability of the circuit. The output processing module helps to improve the quality of the output voltage and reduce the high-frequency noise and harmonics at the output. The input voltage detection and protection function is realized by the enabling module, and the input voltage is monitored in real time. Once the input voltage exceeds the specified range, the buck conversion module is stopped to protect the subsequent circuit. In summary, this technical solution provides an effective DC step-down power supply circuit that can meet the needs of energy storage air conditioners. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of a DC step-down power supply circuit proposed in this application.

[0025] Illustration: R1, first resistor; R2, second resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; L1, first inductor; U1, PWM controller; GND, ground terminal. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0027] Example 1.

[0028] Reference Figure 1 The embodiment of the present application provides a DC step-down power supply circuit for an energy storage air conditioner, comprising:

[0029] A step-down conversion module, wherein the step-down conversion module receives direct current through its input terminal and performs voltage conversion on the direct current;

[0030] An enabling module, the enabling module comprising a first resistor R1 and a second resistor R2, wherein a first end of the first resistor R1 is connected to an input end of the buck conversion module, a first end of the second resistor R2 is grounded, and a second end of the first resistor R1 and a second end of the second resistor R2 are commonly connected to an enabling end of the power chip; the first resistor R1 and the second resistor R2 are used to calculate an input voltage range of the buck conversion module, so as to drive the buck conversion module to work according to the input voltage of the buck conversion module;

[0031] An output processing module is used to filter out high-frequency noise and harmonics in the voltage at the output end of the buck conversion module.

[0032] It can be considered that the energy storage air conditioning system requires different voltages to supply its internal components. The buck conversion module is connected to direct current through its input terminal, and performs voltage conversion on the direct current to reduce it to a voltage level suitable for the operation of the energy storage air conditioning. The function of the enabling module is to drive the operation of the buck conversion module according to the input voltage of the buck conversion module. Through the connection method of the first resistor R1 and the second resistor R2, the buck conversion module can be disabled when the input voltage of the buck conversion module is out of range to protect the entire circuit. The output processing module is used to filter out high-frequency noise and harmonics in the voltage at the output end of the buck conversion module to avoid the output of noise and harmonics caused by the switching of the internal switching elements of the buck conversion module or due to interference in the external environment of the circuit. By filtering out noise and harmonics, the output processing module ensures the quality and stability of the output voltage.

[0033] Therefore, the enabling module can effectively protect the buck conversion module according to the input voltage range, thereby improving the stability and reliability of the circuit. The output processing module helps to improve the quality of the output voltage and reduce the high-frequency noise and harmonics at the output end. The input voltage detection and protection function is realized by the enabling module, and the input voltage is monitored in real time. Once the input voltage exceeds the specified range, the buck conversion module stops working, thereby protecting the subsequent circuit.

[0034] In summary, this technical solution provides an effective DC step-down power supply circuit that can meet the needs of energy storage air conditioning.

[0035] As an example, the input voltage range is calculated based on the first resistor R1 and the second resistor R2 to protect the input circuit. Once the input voltage is not within the specified range (the input voltage exceeds the specified range), the step-down conversion module stops working, thereby protecting the entire subsequent circuit.

[0036] The calculation formulas for input start voltage Vstart and input stop voltage Vstop are as follows:

[0037] R1=[Vstart(Va / Vb)-Vstop] / [Ip(1-Va / Vb)+Ih];

[0038] R2=R1*Va / [Vstop-Va+R1(Ip+Ih)];

[0039] Among them, Ip=0.7µA; Ih=1.55µA; Va=1.19V; Vb=1.22V.

[0040] In one embodiment, the step-down conversion module is a PWM controller U1. As an example, the model of the PWM controller U1 is TPS54202DDC. The PWM controller U1 may include an input terminal (VIN), an enable terminal (EN), a ground terminal (GND), a startup terminal (BOOT), a switch output terminal (SW), and a feedback terminal (FB). When the model of the PWM controller U1 is TPS54202DDC, it has an internal switch tube overcurrent protection circuit to provide an overcurrent protection function.

[0041] Using a PWM (pulse width modulation) controller as a step-down conversion module can achieve precise control of the output voltage and current by adjusting the duty cycle, thereby improving the power density of the power supply. The working principle of the PWM controller U1 is based on changing the width of the pulse signal to control the output voltage or current. Increasing the duty cycle will increase the average value of the output, while reducing the duty cycle will reduce the average value of the output.

[0042] In one embodiment, the input voltage ranges from 8 VDC to 28 VDC, and the output voltage is 5 VDC.

[0043] The input voltage range is 8VDC to 28VDC, which can be applied to a variety of different power supply situations, so that the technical solution provided by this embodiment can be applied to a variety of different scenarios and application environments. By adjusting the output voltage through the PWM controller U1, the output voltage can be accurately controlled and the stability can be maintained, ensuring that the output voltage is always maintained at 5VDC to meet the power supply requirements of the load. Both the input and output voltages are DC, and DC step-down conversion technology is generally more efficient than traditional linear regulation technology, which can reduce the power consumption and heat loss of the system, and contribute to energy conservation and environmental protection. Since the above technical solution is applicable to situations with a wide range of input voltages and the output voltage is stable, it can be applied to scenarios such as energy storage air conditioners that require a stable power supply to ensure the normal operation of the equipment.

[0044] In one embodiment, the resistance of the first resistor R1 is 5.11 kΩ, and the resistance of the second resistor R2 is 105 kΩ.

[0045] In one embodiment, the output processing module includes a first capacitor C1, a second capacitor C2 and a first inductor L1; the first end of the first capacitor C1 is connected to the start end of the buck conversion module, the second end of the first capacitor C1 and the first end of the first inductor L1 are commonly connected to the switch output end of the buck conversion module; the first end of the second capacitor C2 is grounded, and the second end of the second capacitor C2 is connected to the second end of the first inductor L1 for output.

[0046] The first capacitor C1 is used as a bootstrap capacitor. The first inductor L1 acts as an energy storage and filter to smooth the output current and reduce the ripple at the output. The second capacitor C2 is used as an output capacitor to reduce the ripple and noise at the output and improve the quality and stability of the output voltage.

[0047] In one embodiment, the output processing module further includes a third capacitor C3, and the third capacitor C3 is arranged in parallel with the second capacitor C2; the capacitance of the first capacitor C1 is 100nf, and the capacitances of the second capacitor C2 and the third capacitor C3 are 22μf respectively. The first capacitor C1 is used to provide a high-frequency filtering effect, and adjust the output voltage at a higher frequency to filter out high-frequency noise and interference at the output end. The second capacitor C2 and the third capacitor C3 are used to provide a stronger low-frequency filtering effect, thereby further smoothing the output voltage and reducing the ripple and noise at the output end.

[0048] In one embodiment, a fourth capacitor C4 is further included, a first end of the fourth capacitor C4 is connected to the input end of the buck conversion module, and a second end of the fourth capacitor C4 is grounded.

[0049] Energy storage air conditioners usually require a stable power supply to ensure their normal operation. The fourth capacitor C4 is connected to the input end of the buck converter module to provide capacitor filtering. By stabilizing the input voltage and reducing interference, the fourth capacitor C4 can reduce the working pressure of the buck converter module, extend its life, and improve its stability and reliability, ensuring the long-term stable operation of the energy storage air conditioner.

[0050] In one embodiment, a fifth capacitor C5 is further included, wherein a first end of the fifth capacitor C5 and a first end of the fourth capacitor C4 are connected to the input end of the step-down conversion module, and a second end of the fifth capacitor C5 and a second end of the fourth capacitor C4 are connected to a ground terminal GND. The capacitance of the fourth capacitor C4 is 10 μf, and the capacitance of the fifth capacitor C5 is 100 nf.

[0051] Therefore, a more stable input voltage can be provided for the step-down conversion module by considering both high-frequency filtering effect and low-frequency filtering effect.

[0052] Example 2.

[0053] An embodiment of the present application provides an energy storage air conditioner, including a DC step-down power supply circuit as described in any one of Embodiment 1. Its specific embodiments are consistent with the embodiments described in the above-mentioned Embodiment 1 and the technical effects achieved, and some contents will not be repeated here.

[0054] The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "corresponding to" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A DC step-down power supply circuit, characterized in that: Used for energy storage air conditioning, including: A step-down conversion module, wherein the step-down conversion module receives direct current through its input terminal and performs voltage conversion on the direct current; An enabling module, the enabling module comprising a first resistor and a second resistor, wherein a first end of the first resistor is connected to an input end of the buck conversion module, a first end of the second resistor is grounded, and a second end of the first resistor and a second end of the second resistor are commonly connected to an enabling end of a power supply chip; the first resistor and the second resistor are used to calculate an input voltage range of the buck conversion module, so as to drive the buck conversion module to work according to the input voltage of the buck conversion module; An output processing module is used to filter out high-frequency noise and harmonics in the voltage at the output end of the buck conversion module.

2. The DC step-down power supply circuit according to claim 1, characterized in that: The step-down conversion module is a PWM controller.

3. The DC step-down power supply circuit according to claim 2, characterized in that: The input voltage ranges from 8 VDC to 28 VDC, and the output voltage is 5 VDC.

4. The DC step-down power supply circuit according to claim 3, characterized in that: The resistance value of the first resistor is 5.11 kΩ, and the resistance value of the second resistor is 105 kΩ.

5. The DC step-down power supply circuit according to claim 1, characterized in that: The output processing module includes a first capacitor, a second capacitor and a first inductor; the first end of the first capacitor is connected to the start end of the buck conversion module, the second end of the first capacitor and the first end of the first inductor are commonly connected to the switch output end of the buck conversion module; the first end of the second capacitor is grounded, and the second end of the second capacitor is connected to the second end of the first inductor for output.

6. The DC step-down power supply circuit according to claim 5, characterized in that: The output processing module further includes a third capacitor, which is connected in parallel with the second capacitor; the capacitance of the first capacitor is 100 nf, and the capacitances of the second capacitor and the third capacitor are 22 μf respectively.

7. The DC step-down power supply circuit according to claim 1, characterized in that: It also includes a fourth capacitor, a first end of the fourth capacitor is connected to the input end of the buck conversion module, and a second end of the fourth capacitor is grounded.

8. The DC step-down power supply circuit according to claim 7, characterized in that: It also includes a fifth capacitor, a first end of the fifth capacitor and a first end of the fourth capacitor are commonly connected to the input end of the buck conversion module, and a second end of the fifth capacitor and a second end of the fourth capacitor are commonly connected to the ground end.

9. The DC step-down power supply circuit according to claim 8, characterized in that: The capacitance of the fourth capacitor is 10 μf, and the capacitance of the fifth capacitor is 100 nf.

10. An energy storage air conditioner, characterized in that: A DC step-down power supply circuit comprising any one of claims 1 to 9.

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