Step-down power supply

Abstract

The utility model discloses a step-down power supply. The step-down power supply comprises a control module; the power supply module is electrically connected with the control module; and the voltage conversion module is electrically connected with the power supply module and the control module. According to the step-down power supply provided by the utility model, after the voltage input to the control module by the interface unit of the power supply module is processed by the voltage conversion module, the high voltage continuously output by the power supply module is continuously converted into the low voltage with uniform size, so that the fluctuation when the power supply module supplies power to the control module is reduced; the voltage loop stability of the power supply module is improved, and the phenomenon that the MCU crashes or gets stuck is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, in particular to a step-down power supply. Background Art

[0002] In hardware circuit design, it is necessary to provide a variety of different power supplies to power chips with different operating voltages. However, the power supply for different chips currently fluctuates greatly and has poor power supply stability, causing the MCU to freeze or get stuck due to advanced communication failures or logical errors. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a step-down power supply, which can provide a stable power supply and prevent the MCU from freezing or freezing.

[0004] On the one hand, a step-down power supply according to an embodiment of the utility model includes:

[0005] Control module;

[0006] a power supply module, the power supply module being electrically connected to the control module;

[0007] A voltage conversion module is electrically connected to the power supply module and the control module respectively.

[0008] According to some embodiments of the utility model, the power supply module is provided with a first interface unit and a second interface unit, the first interface unit is electrically connected to the control module, the second interface unit is electrically connected to the first interface unit and the voltage conversion module, the first interface unit is provided with a first power socket, a first chip, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a first diode, the first resistor is connected to the second pin of the first power socket, the second resistor is connected to the third pin of the first power socket, the third pin of the first chip is connected to the first pin of the first power socket, the second pin and the fourth pin of the first chip are both connected to one end of the first capacitor, the second capacitor and the third resistor, the other end of the first resistor is connected to the cathode of the first diode, and the first pin of the first chip, the other end of the first capacitor, the other end of the second capacitor and the anode of the first diode are all grounded.

[0009] According to some embodiments of the utility model, the second interface unit is provided with a second power socket, a third capacitor, a fourth capacitor, a first voltage regulator tube and a second voltage regulator tube, one end of the third capacitor and the fourth capacitor are connected to the first pin of the second power socket, the other end of the third capacitor and the fourth capacitor are connected to the fifth pin of the second power socket, one end of the first voltage regulator tube is connected to the voltage conversion module, one end of the second voltage regulator tube is connected to the control module, and the other end of the first voltage regulator tube and the second voltage regulator tube are both grounded.

[0010] According to some embodiments of the utility model, the voltage conversion module is provided with a rectifier and filter unit and a transformer unit, the transformer unit is respectively connected to the rectifier and filter unit and the power supply module, the rectifier and filter unit is provided with a third power socket, a fourth resistor, a fifth resistor, a sixth resistor, a bridge rectifier circuit, a fifth capacitor, a sixth capacitor, a first inductor and a second inductor, one end of the fourth resistor is connected to the first pin of the third power socket, the other end of the fourth resistor and the other end of the fifth resistor are both connected to the first end of the bridge rectifier circuit, the other end of the fifth resistor and the second end of the bridge rectifier circuit are connected to the second pin of the third power socket, the third end of the bridge rectifier circuit is respectively connected to one end of the first inductor and the fifth capacitor, the fourth end of the bridge rectifier circuit and the other end of the fifth capacitor are both connected to the second inductor, the other end of the first inductor is respectively connected to one end of the transformer unit and the sixth capacitor, and the other end of the sixth capacitor is grounded.

[0011] According to some embodiments of the utility model, the transformer unit is provided with a second chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a second diode, a third diode, a fourth diode and a first transformer, one end of the seventh capacitor, one end of the seventh resistor and a first end of the first transformer are all connected to the rectifier and filter unit, the other ends of the seventh capacitor and the seventh resistor are both connected to a section of the eighth resistor, the other end of the eighth capacitor is connected to the anode of the second diode, the cathode of the second diode and the second end of the first transformer are both connected to the second chip, one end of the eighth capacitor and the thirteenth resistor are both connected to the first pin of the second chip, the other end of the eighth capacitor, the second pin of the second chip, one end of the ninth resistor, one end of the tenth resistor, the One end of the ninth capacitor and one end of the eleventh resistor are both connected to the third pin of the first transformer, the other end of the ninth resistor, the other end of the tenth resistor, the other end of the ninth capacitor and one end of the twelfth resistor are all connected to the third pin of the second chip, the other end of the thirteenth resistor is connected to the anode of the third diode, the other end of the eleventh resistor, the other end of the twelfth resistor and the cathode of the third diode are all connected to the fourth end of the first transformer, one end of the fourteenth resistor and the cathode of the fourth diode are both connected to the fifth end of the first transformer, the other end of the fourteenth resistor is connected to one end of the tenth capacitor, the other end of the tenth capacitor, the anode of the fourth diode, one end of the eleventh capacitor, one end of the twelfth capacitor and a section of the fifteenth resistor are all connected to the power supply module, and the other ends of the eleventh capacitor, the twelfth capacitor and the fifteenth resistor are all connected to the sixth end of the first transformer.

[0012] According to some embodiments of the utility model, the control module is also provided with a reset unit, and the reset unit is provided with a third chip, a fourteenth resistor, a thirteenth capacitor and a reset button, one end of the fourteenth resistor is connected to the power supply module, the other end of the fourteenth resistor, one end of the reset button and one end of the thirteenth capacitor are all connected to the third chip, and the other ends of the reset button and the thirteenth capacitor are both grounded.

[0013] According to some embodiments of the utility model, the third chip is provided with a fifteenth resistor, a sixteenth resistor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor and a seventeenth capacitor, one end of the fifteenth resistor and the fourteenth capacitor are both connected to the forty-fifth pin of the third chip, the other end of the fifteenth resistor and one end of the fifteenth capacitor are both connected to the forty-fourth pin of the third chip, the other end of the fourteenth capacitor and the fifteenth capacitor are both grounded, one end of the sixteenth resistor and the sixteenth capacitor are both connected to the forty-third pin of the third chip, the other end of the sixteenth resistor and one end of the seventeenth capacitor are both connected to the forty-second pin of the third chip, and the other end of the sixteenth capacitor and the seventeenth capacitor are both grounded.

[0014] According to some embodiments of the present invention, the control module is further provided with a display unit.

[0015] The step-down power supply according to the embodiment of the utility model has at least the following beneficial effects:

[0016] A control module; a power supply module, the power supply module is electrically connected to the control module; a voltage conversion module, the voltage conversion module is electrically connected to the transformer module. According to the step-down power supply of the utility model, the voltage input from the interface unit of the power supply module to the control module is processed by the voltage conversion module, and the high voltage continuously output by the power supply module is continuously converted into a low voltage of uniform size, thereby reducing the volatility of the power supply module when supplying power to the control module, improving the voltage loop stability of the power supply module, and preventing the MCU from freezing or freezing.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the principle of a step-down power supply according to an embodiment of the utility model;

[0020] Figure 2 This is a circuit diagram of the first interface unit of the embodiment of the utility model;

[0021] Figure 3 This is a circuit schematic diagram of the second interface unit of an embodiment of the utility model;

[0022] Figure 4 This is a circuit diagram of a voltage conversion module according to an embodiment of the present utility model;

[0023] Figure 5 This is a circuit diagram of a transformer unit according to an embodiment of the present utility model;

[0024] Figure 6 This is a circuit schematic diagram of the third chip of an embodiment of the utility model.

[0025] Reference numerals:

[0026] Control module 100 , power supply module 200 , voltage conversion module 300 . DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0028] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figure 1 The embodiment of the utility model provides a step-down power supply, including a control module; a power supply module, the power supply module is electrically connected to the control module; and a voltage conversion module, the voltage conversion module is electrically connected to the power supply module and the control module respectively. According to the step-down power supply of the utility model, the voltage input from the interface unit of the power supply module to the control module is processed by the voltage conversion module, and the high voltage continuously output by the power supply module is continuously converted into a low voltage of uniform size, thereby reducing the volatility when the power supply module supplies power to the control module, improving the voltage loop stability of the power supply module, and preventing the MCU from freezing or freezing.

[0031] Reference Figure 2The power supply module is provided with a first interface unit and a second interface unit. The first interface unit is electrically connected to the control module, and the second interface unit is electrically connected to the first interface unit and the voltage conversion module. The first interface unit is provided with a first power socket J1, a first chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2 and a first diode D1. The first resistor R1 is connected to the second pin of the first power socket J1, the second resistor R2 is connected to the third pin of the first power socket J1, the third pin of the first chip U1 is connected to the first pin of the first power socket J1, the second pin and the fourth pin of the first chip U1 are both connected to one end of the first capacitor C1, the second capacitor C2 and the third resistor R3, the other end of the first resistor R1 is connected to the cathode of the first diode D1, and the first pin of the first chip U1, the other end of the first capacitor C1, the other end of the second capacitor C2 and the anode of the first diode D1 are all grounded.

[0032] It should be noted that the 5V voltage provided by the first power socket J1 is reduced to 3.3V after being processed by the first chip U1. The first capacitor C1, the second capacitor C2 and the third capacitor C3 are used to filter the 3.3V voltage processed by the first chip U1. Those skilled in the art can understand that small capacitors are used for high-frequency filtering and large capacitors are used for low-frequency filtering; the first diode D1 is used to indicate the working status of the power supply module, and the first diode D1 is connected in series with a third resistor R3 to limit the voltage output from the first chip U1 to the first diode D1 to prevent the first diode D1 from being damaged due to voltage instability or excessive voltage.

[0033] Reference Figure 3 The second interface unit includes a second power socket J2, a third capacitor C3, a fourth capacitor C4, a first voltage regulator tube VD1 and a second voltage regulator tube VD2. One end of the third capacitor C3 and the fourth capacitor C4 are connected to the first pin of the second power socket J2, and the other end of the third capacitor C3 and the fourth capacitor C4 are connected to the fifth pin of the second power socket J2. One end of the first voltage regulator tube VD1 is connected to the voltage conversion module, one end of the second voltage regulator tube VD2 is connected to the control module, and the other ends of the first voltage regulator tube VD1 and the second voltage regulator tube VD2 are grounded.

[0034] It should be noted that the second power socket J2 is used to provide a 5V voltage. The 5V voltage output by the second power socket J2 is stabilized within the range of 3.3V or 5V through the first voltage regulator tube VD1 and the second voltage regulator tube VD2, ensuring that the third capacitor C3 and the fourth capacitor C4 can work normally, avoiding unstable voltage output to the power supply module or the control module due to power supply fluctuations, and reducing various noises and interferences in the circuit, preventing overcurrent, overvoltage or other abnormal conditions from causing damage to the internal components of the power supply module or other functional modules.

[0035] Reference Figure 4 The voltage conversion module is provided with a rectifier filter unit and a transformer unit. The transformer unit is respectively connected to the rectifier filter unit and the power supply module. The rectifier filter unit is provided with a third power socket J3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a bridge rectifier circuit, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1 and a second inductor L2. One end of the fourth resistor R4 is connected to the first pin of the third power socket J3, the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are both connected to the first end of the bridge rectifier circuit, the other end of the fifth resistor R5 and the second end of the bridge rectifier circuit are connected to the second pin of the third power socket J3, the third end of the bridge rectifier circuit is respectively connected to one end of the first inductor L1 and the fifth capacitor C5, the fourth end of the bridge rectifier circuit and the other end of the fifth capacitor C5 are both connected to the second inductor L2, the other end of the first inductor L1 is respectively connected to one end of the transformer unit and the sixth capacitor C6, and the other end of the sixth capacitor C6 is grounded.

[0036] It should be noted that the transformation unit is connected to the rectifier and filter unit to realize the transformation of the power supply voltage, so as to adapt to the voltage requirements of the control module in different situations. For example, the high voltage of the power supply module is converted into a low voltage to adapt to the operation requirements of the MCU in different situations. The rectifier and filter unit passes through the bridge rectifier circuit, the first inductor L1 and the second inductor L2. When the current output by the bridge rectifier circuit changes transiently, high-frequency noise will be generated. The first inductor L1 and the second inductor L2 suppress the high-frequency noise generated by the transient through the inductance itself and the self-inductance of the current. The first inductor L1 and the second inductor L2 hinder the rapid recording of the current change, thereby reducing the amplitude of the transient noise. In addition, the first inductor L1 and the second inductor L2 can store the current and gradually release it, so as to smoothly output the current to the transformation unit, avoid current fluctuations caused by the control module or other factors, and further improve the power supply reliability and stability of the power supply module.

[0037] Reference Figure 5The transformer unit is provided with a second chip U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a second diode D2, a third diode D3, a fourth diode and a first transformer T1, one end of the seventh capacitor C7, one end of the seventh resistor R7 The first end of the seventh capacitor C7 and the first end of the seventh resistor R7 are connected to the rectifier and filter unit, the other ends of the seventh capacitor C7 and the seventh resistor R7 are connected to one end of the eighth resistor R8, the other end of the eighth capacitor C8 is connected to the anode of the second diode D2, the cathode of the second diode D2 and the second end of the first transformer T1 are connected to the second chip U2, the eighth capacitor C8 and one end of the thirteenth resistor R13 are connected to the first pin of the second chip U2, the other end of the eighth capacitor C8, the second pin of the second chip U2, one end of the ninth resistor R9, the One end of the tenth resistor R10, one end of the ninth capacitor C9 and one end of the eleventh resistor R11 are all connected to the third pin of the first transformer T1, the other end of the ninth resistor R9, the other end of the tenth resistor R10, the other end of the ninth capacitor C9 and one end of the twelfth resistor R12 are all connected to the third pin of the second chip U2, the other end of the thirteenth resistor R13 is connected to the anode of the third diode D3, the other end of the eleventh resistor R11, the other end of the twelfth resistor R12 and the cathode of the third diode D3 are all connected to the The fourth end is connected, one end of the fourteenth resistor R14 and the cathode of the fourth diode are connected to the fifth end of the first transformer T1, the other end of the fourteenth resistor R14 is connected to one end of the tenth capacitor C10, the other end of the tenth capacitor C10, the anode of the fourth diode, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12 and a section of the fifteenth resistor R15 are all connected to the power supply module, and the other ends of the eleventh capacitor C11, the twelfth capacitor C12 and the fifteenth resistor R15 are all connected to the sixth end of the first transformer T1.

[0038] It should be noted that the second chip U2 uses the PN6675H chip, which has multiple built-in protection mechanisms, including over-inquiry protection, over-current protection and short-circuit protection, to ensure the safety and stability of the current transmission from the voltage conversion module to the control module. Specifically, the current is input on the left side of the first transformer T1, and the current generates a magnetic field in the circular coil, which penetrates the iron core of the first transformer T1 and is transmitted to the secondary coil, so that the input circuit and the output circuit are isolated, the stability of the current input from the power supply module to the control module is improved, and the noise and interference signals in the input power supply are effectively filtered out, further improving the communication stability of the MUC and reducing the occurrence of freezing and jamming.

[0039] Reference Figure 6 The control module is also provided with a reset unit, which is provided with a third chip U3, a sixteenth resistor, a thirteenth capacitor C13 and a reset button, one end of the sixteenth resistor is connected to the power supply module, the other end of the sixteenth resistor, one end of the reset button and one end of the thirteenth capacitor C13 are all connected to the third chip U3, and the other ends of the reset button and the thirteenth capacitor C13 are both grounded.

[0040] It should be noted that the sixteenth resistor, the thirteenth capacitor C13 and one end of the reset button are connected to the low level of the third chip U3. When the chip is just powered on, the thirteenth capacitor C13 is turned on, allowing current to pass. When the reset button is pressed, the first chip U1 is grounded and reset.

[0041] The third chip U3 is provided with a seventeenth resistor R17, an eighteenth resistor R18, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16 and a seventeenth capacitor C17, one end of the seventeenth resistor R17 and the fourteenth capacitor C14 are both connected to the forty-fifth pin of the third chip U3, the other end of the seventeenth resistor R17 and one end of the fifteenth capacitor C15 are both connected to the forty-fourth pin of the third chip U3, the other end of the fourteenth capacitor C14 and the fifteenth capacitor C15 are both grounded, one end of the eighteenth resistor R18 and the sixteenth capacitor C16 are both connected to the forty-third pin of the third chip U3, the other end of the eighteenth resistor R18 and one end of the seventeenth capacitor C17 are both connected to the forty-second pin of the third chip U3, and the seventeenth capacitor C17 and the other end of the seventeenth capacitor C17 are both grounded.

[0042] It should be noted that one end of the fifteenth resistor R15 and the fourteenth capacitor C14 are both connected to the forty-fifth pin of the third chip U3, so as to stabilize the output voltage of the third chip U3 and reduce the noise and interference signals generated by the circuit; the fifteenth resistor R15, the sixteenth resistor and the fourteenth capacitor C14 are connected in series to form a low-pass filter to filter out high-frequency noise and interference signals, thereby improving the quality and stability of the output voltage; the other end of the fifteenth resistor R15 and one end of the fifteenth capacitor C15 are both connected to the forty-fourth pin of the third chip U3, so as to further improve the stability and reliability of the output voltage of the third chip U3 and limit the change of current, thereby ensuring the stability of the output voltage; the other ends of the fourteenth capacitor C14 and the fifteenth capacitor C15 are both grounded, so as to short-circuit the noise and interference signals in the power supply to the ground, thereby reducing the interference and noise generated by the circuit and improving the quality and stability of the output voltage.

[0043] The control module is also provided with a display unit. It should be noted that the display unit is usually in the form of a digital tube, a liquid crystal screen or an LCD, and the power supply output voltage or other related information is displayed by controlling the working state of these display units. The control circuit measures the power supply output voltage, converts the measurement result into corresponding numbers or characters, and displays it on the display unit. Through the display unit, the user can directly observe the value of the power supply output voltage without using additional test equipment or instruments for measurement, which improves the convenience of operation.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "further embodiments", "some specific embodiments" or "some examples" etc. means that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A step-down power supply, characterized in that: include: Control module; a power supply module, the power supply module being electrically connected to the control module; A voltage conversion module, wherein the voltage conversion module is electrically connected to the control module and the power supply module respectively, and the voltage conversion module is provided with a rectifier filter unit and a transformer unit, wherein the transformer unit is connected to the rectifier filter unit and the power supply module respectively, and the rectifier filter unit is provided with a third power supply socket, a fourth resistor, a fifth resistor, a sixth resistor, a bridge rectifier circuit, a fifth capacitor, a sixth capacitor, a first inductor and a second inductor, wherein one end of the fourth resistor is connected to the first pin of the third power supply socket, the other end of the fourth resistor and the other end of the fifth resistor are both connected to the first end of the bridge rectifier circuit, the other end of the fifth resistor and the second end of the bridge rectifier circuit are connected to the second pin of the third power supply socket, the third end of the bridge rectifier circuit is respectively connected to one end of the first inductor and the fifth capacitor, the fourth end of the bridge rectifier circuit and the other end of the fifth capacitor are both connected to the second inductor, the other end of the first inductor is respectively connected to one end of the transformer unit and the sixth capacitor, and the other end of the sixth capacitor is grounded.

2. The step-down power supply according to claim 1, characterized in that: The power supply module is provided with a first interface unit and a second interface unit, the first interface unit is electrically connected to the control module, the second interface unit is electrically connected to the first interface unit and the voltage conversion module, the first interface unit is provided with a first power socket, a first chip, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a first diode, the first resistor is connected to the second pin of the first power socket, the second resistor is connected to the third pin of the first power socket, the third pin of the first chip is connected to the first pin of the first power socket, the second pin and the fourth pin of the first chip are both connected to one end of the first capacitor, the second capacitor and the third resistor, the other end of the first resistor is connected to the cathode of the first diode, and the first pin of the first chip, the other end of the first capacitor, the other end of the second capacitor and the anode of the first diode are all grounded.

3. The step-down power supply according to claim 2, characterized in that: The second interface unit is provided with a second power socket, a third capacitor, a fourth capacitor, a first voltage regulator tube and a second voltage regulator tube, one end of the third capacitor and the fourth capacitor are connected to the first pin of the second power socket, the other end of the third capacitor and the fourth capacitor are connected to the fifth pin of the second power socket, one end of the first voltage regulator tube is connected to the voltage conversion module, one end of the second voltage regulator tube is connected to the control module, and the other ends of the first voltage regulator tube and the second voltage regulator tube are both grounded.

4. The step-down power supply according to claim 1, characterized in that: The transformer unit is provided with a second chip, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a second diode, a third diode, a fourth diode and a first transformer, one end of the seventh capacitor, one end of the seventh resistor and a first end of the first transformer are all connected to the rectifying and filtering unit, the other ends of the seventh capacitor and the seventh resistor are both connected to a section of the eighth resistor, the other end of the eighth capacitor is connected to the anode of the second diode, the cathode of the second diode and the second end of the first transformer are both connected to the second chip, one end of the eighth capacitor and the thirteenth resistor are both connected to the first pin of the second chip, the other end of the eighth capacitor, the second pin of the second chip, one end of the ninth resistor, one end of the tenth resistor, one end of the ninth capacitor The first terminal of the first transformer is connected to the power supply module, the second terminal of the first transformer is connected to the power supply module, the first terminal of the first transformer is connected to the power supply module, the second terminal of the first transformer is connected to the power supply module, and the second terminal of the first transformer is connected to the power supply module. The first terminal of the first transformer is connected to the power supply module, the second terminal of the first transformer is connected to the power supply module, and the second terminal of the first transformer is connected to the power supply module, the first terminal of the first transformer is connected to the power supply module, and the second terminal of the first transformer is connected to the power supply module, the first terminal of the first transformer is connected to the power supply module, and the second terminal of the first transformer is connected to the power supply module, and the second terminal of the first transformer is connected to the power supply module, 5. The step-down power supply according to claim 1, characterized in that: The control module is also provided with a reset unit, and the reset unit is provided with a third chip, a fourteenth resistor, a thirteenth capacitor and a reset button, one end of the fourteenth resistor is connected to the power supply module, the other end of the fourteenth resistor, one end of the reset button and one end of the thirteenth capacitor are all connected to the third chip, and the other ends of the reset button and the thirteenth capacitor are both grounded.

6. The step-down power supply according to claim 5, characterized in that: The third chip is provided with a fifteenth resistor, a sixteenth resistor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor and a seventeenth capacitor, one end of the fifteenth resistor and the fourteenth capacitor are both connected to the forty-fifth pin of the third chip, the other end of the fifteenth resistor and one end of the fifteenth capacitor are both connected to the forty-fourth pin of the third chip, the other end of the fourteenth capacitor and the fifteenth capacitor are both grounded, one end of the sixteenth resistor and the sixteenth capacitor are both connected to the forty-third pin of the third chip, the other end of the sixteenth resistor and one end of the seventeenth capacitor are both connected to the forty-second pin of the third chip, and the other end of the sixteenth capacitor and the seventeenth capacitor are both grounded.

7. The step-down power supply according to claim 1, characterized in that: The control module is also provided with a display unit.

Images