Voltage reduction circuit

Abstract

The utility model discloses a kind of voltage reduction circuits, comprising: voltage input terminal, voltage output terminal, anti-reverse connection unit, isolation unit, first filter unit, DC-DC voltage reduction unit, second filter unit and state indicating unit;DC-DC voltage reduction unit includes input port and output port;Voltage input terminal is electrically connected with the input port of DC-DC voltage reduction unit by anti-reverse connection unit and first filter unit;The output port of DC-DC voltage reduction unit is electrically connected with voltage output terminal by second filter unit and state indicating unit;First filter unit is also electrically connected with ground electrode by isolation unit.The technical scheme of the utility model, so that through voltage reduction circuit can be multiple voltage source, and simple design, simultaneously, safety performance is better.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a step-down circuit. Background Technology

[0002] With the rapid development of society and economy and the continuous improvement of people's living standards, the functions of ordinary beds can no longer meet the needs of users for a high-quality life. Many people have begun to pursue smart beds with more functions and greater comfort.

[0003] Existing smart beds can integrate functions such as headrest raising and lowering, footrest raising and lowering, lighting, voice interaction, and Bluetooth control according to user needs. The circuitry for implementing these functions requires multiple voltage sources; however, due to the special nature of smart beds, their power supply modules need to be sufficiently small to improve aesthetics and practicality. Therefore, there is an urgent need for a simple step-down circuit that can provide multiple voltages from a single power supply. Utility Model Content

[0004] This invention provides a step-down circuit to overcome the shortcomings of existing technologies, achieving multiple voltages with a single power supply and with a simple design.

[0005] According to one aspect of the present invention, a step-down circuit is provided, comprising: a voltage input terminal, a voltage output terminal, a reverse connection protection unit, an isolation unit, a first filter unit, a DC-DC step-down unit, a second filter unit, and a status indication unit;

[0006] The DC-DC step-down unit includes an input port and an output port;

[0007] The voltage input terminal is electrically connected to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit; the output port of the DC-DC step-down unit is electrically connected to the voltage output terminal through the second filter unit and the status indicator unit.

[0008] The first filtering unit is also electrically connected to the ground electrode through the isolation unit.

[0009] Optionally, the reverse connection protection unit includes a first diode;

[0010] The positive terminal of the first diode is electrically connected to the voltage input terminal; the negative terminal of the first diode is electrically connected to the first filter unit.

[0011] Optionally, the first filtering unit includes a first capacitor;

[0012] The positive terminal of the first capacitor is electrically connected between the reverse connection protection unit and the input port of the DC-DC step-down unit, and the negative terminal of the first capacitor is electrically connected to the ground electrode through the isolation unit.

[0013] Optionally, the first filtering unit further includes a second capacitor;

[0014] The first capacitor and the second capacitor are connected in parallel. The first terminal of the second capacitor is electrically connected to the positive terminal of the first capacitor, and the second terminal of the second capacitor is electrically connected to the negative terminal of the first capacitor.

[0015] Optionally, the DC-DC buck unit includes a DC-DC buck chip, a first inductor, a third capacitor, a first resistor, and a second resistor;

[0016] The DC-DC step-down chip includes an IN pin, a GND pin, an SW pin, and an FB pin;

[0017] The IN pin is electrically connected to the input port, and the GND pin is electrically connected to the ground electrode through the isolation unit; the SW pin is electrically connected to the output port through the first inductor; the first end of the first resistor is electrically connected between the first inductor and the output port, the second end of the first resistor is electrically connected to the ground electrode through the second resistor and the isolation unit, and the second end of the first resistor is also electrically connected to the FB pin; the third capacitor is connected in parallel with the first resistor.

[0018] Optionally, the second filtering unit includes a fourth capacitor;

[0019] The positive terminal of the fourth capacitor is electrically connected between the output port of the DC-DC step-down unit and the status indicator unit, and the negative terminal of the fourth capacitor is electrically connected to the ground electrode through the isolation unit.

[0020] Optionally, the second filtering unit further includes a fifth capacitor and a sixth capacitor;

[0021] The fourth capacitor, the fifth capacitor, and the sixth capacitor are connected in parallel. The first terminal of the fifth capacitor and the first terminal of the sixth capacitor are electrically connected to the positive terminal of the fourth capacitor, and the second terminal of the fifth capacitor and the second terminal of the sixth capacitor are electrically connected to the negative terminal of the fourth capacitor.

[0022] Optionally, the status indication unit includes a light-emitting diode;

[0023] The positive terminal of the light-emitting diode is electrically connected to the output port of the DC-DC step-down unit, and the negative terminal of the light-emitting diode is electrically connected to the ground electrode through the isolation unit.

[0024] Optionally, the status indication unit further includes a third resistor;

[0025] The positive terminal of the light-emitting diode is electrically connected to the output port of the DC-DC step-down unit through the third resistor.

[0026] Optionally, the isolation unit includes a fourth resistor, the first end of which is electrically connected to the first filter unit, and the second end of which is electrically connected to the ground electrode.

[0027] The technical solution of this utility model includes a step-down circuit comprising a voltage input terminal, a voltage output terminal, a reverse connection protection unit, an isolation unit, a first filter unit, a DC-DC step-down unit, a second filter unit, and a status indicator unit. The DC-DC step-down unit includes an input port and an output port. The voltage input terminal is electrically connected to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit. The output port of the DC-DC step-down unit is electrically connected to the voltage output terminal through the second filter unit and the status indicator unit. The first filter unit is also electrically connected to the ground electrode through the isolation unit. This allows the smart bed to achieve multiple voltage sources through the step-down circuit, thereby meeting the smart bed's voltage source requirements. In addition, the step-down circuit has high conversion efficiency. By electrically connecting the voltage input terminal to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit, and electrically connecting the output port of the DC-DC step-down unit to the voltage output terminal through the second filter unit and the status indicator unit, and by electrically connecting the first filter unit to the ground electrode through the isolation unit, the step-down circuit exhibits good safety performance.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a step-down circuit provided in an embodiment of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] The step-down circuit provided in this embodiment can convert a higher voltage source to a lower voltage source, for example, converting 29V to 5V. For example, this step-down circuit can be applied to a smart bed, enabling the smart bed to operate on multiple voltages from a single power supply, thus improving the aesthetics and practicality of the smart bed.

[0034] Figure 1 This is a schematic diagram of a step-down circuit provided in an embodiment of the present invention, with reference to... Figure 1 As shown, the step-down circuit includes a voltage input terminal 1, a voltage output terminal 2, a reverse connection protection unit 3, an isolation unit 4, a first filter unit 5, a DC-DC step-down unit 6, a second filter unit 7, and a status indicator unit 8. The DC-DC step-down unit 6 includes an input port and an output port. The voltage input terminal 1 is electrically connected to the input port of the DC-DC step-down unit 6 through the reverse connection protection unit 3 and the first filter unit 5. The output port of the DC-DC step-down unit 6 is electrically connected to the voltage output terminal 2 through the second filter unit 7 and the status indicator unit 8. The first filter unit 5 is also electrically connected to the ground electrode through the isolation unit 4.

[0035] Among them, voltage input terminal 1 is used to connect to the power supply. The step-down circuit reduces the voltage input to voltage input terminal 1 and outputs it through voltage output terminal 2.

[0036] The reverse connection protection unit 3 is used to prevent the positive and negative terminals of the power supply from being connected in reverse, which could damage the electronic components in the step-down circuit. In an optional embodiment, the reverse connection protection unit 3 may include, but is not limited to, at least one of a diode, a rectifier bridge, or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0037] The DC-DC buck unit 6 is used to convert a higher voltage source into a lower voltage source. In an optional embodiment, the DC-DC buck unit 6 includes a DC-DC buck chip and its peripheral circuitry.

[0038] The first filter unit 5 is used to filter out noise signals between the voltage input terminal 1 and the input port of the DC-DC step-down unit 6, and the second filter unit 7 is used to filter out noise signals between the output ports of the DC-DC step-down unit 6.

[0039] It should be noted that the first filtering unit 5 and the second filtering unit 7 can filter out noise signals, and this embodiment does not specifically limit the structure of the first filtering unit 5 and the second filtering unit 7. In an optional embodiment, the first filtering unit 5 and / or the second filtering unit 7 may include, but are not limited to, at least one of inductors, capacitors, or ferrite beads.

[0040] It should also be noted that the structures of the first filter unit 5 and the second filter unit 7 can be the same or different, depending on the actual requirements.

[0041] The status indicator unit 8 is used to indicate the operating status of the buck circuit. For example, when the buck circuit is working normally, that is, when the voltage output terminal 2 outputs the bucked voltage normally, the status indicator unit 8 is in the first state; and when the buck circuit is not working normally, that is, when the voltage output terminal 2 cannot output the bucked voltage normally, the status indicator unit 8 is in the second state, so that the user can distinguish the operating status of the buck circuit by the status of the status indicator unit 8. In an optional embodiment, the status indicator unit 8 may include, but is not limited to, at least one of a light-emitting diode or a buzzer.

[0042] The isolation unit 4 is electrically connected between the first filter unit 5 and the ground electrode, resulting in a voltage drop between the first filter unit 5 and the ground electrode, thus preventing a short circuit between the first filter unit 5 and the ground electrode. In an optional embodiment, the isolation unit 4 includes a fourth resistor R4, with its first end electrically connected to the first filter unit 5 and its second end electrically connected to the ground electrode. This allows a voltage drop to be generated between the first filter unit 5 and the ground electrode through the fourth resistor R4, preventing a short circuit between the first filter unit 5 and the ground electrode.

[0043] In this embodiment, the step-down circuit includes a voltage input terminal, a voltage output terminal, a reverse connection protection unit, an isolation unit, a first filter unit, a DC-DC step-down unit, a second filter unit, and a status indicator unit. The DC-DC step-down unit includes an input port and an output port. The voltage input terminal is electrically connected to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit. The output port of the DC-DC step-down unit is electrically connected to the voltage output terminal through the second filter unit and the status indicator unit. The first filter unit is also electrically connected to the ground electrode through the isolation unit. This allows the smart bed to achieve multiple voltage sources through the step-down circuit, thereby meeting the smart bed's voltage source requirements. In addition, the step-down circuit has high conversion efficiency. By electrically connecting the voltage input terminal to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit, and electrically connecting the output port of the DC-DC step-down unit to the voltage output terminal through the second filter unit and the status indicator unit, and by electrically connecting the first filter unit to the ground electrode through the isolation unit, the step-down circuit has good safety performance.

[0044] Optional, continue to refer to Figure 1 As shown, the reverse connection protection unit 3 includes a first diode D1. The positive terminal of the first diode D1 is electrically connected to the voltage input terminal 1, and the negative terminal of the first diode D1 is electrically connected to the first filter unit 5. When the positive and negative terminals of the power supply are connected correctly, the first diode D1 is in the conducting state, and the step-down circuit can work normally. However, when the positive and negative terminals of the power supply are reversed, the first diode D1 is in the cut-off state, and the voltage provided by the power supply cannot be provided to the DC-DC step-down unit 6 of the step-down circuit. This can prevent the electronic components in the step-down circuit from being damaged by the reverse connection of the power supply.

[0045] Optional, continue to refer to Figure 1 As shown, the first filter unit 5 includes a first capacitor C1. The positive terminal of the first capacitor C1 is electrically connected between the reverse connection protection unit 3 and the input port of the DC-DC step-down unit 6, and the negative terminal of the first capacitor C1 is electrically connected to the ground electrode through the isolation unit 4. This allows the first capacitor C1 to prevent voltage changes in the step-down circuit due to load variations, thereby ensuring a relatively stable voltage input to the voltage input terminal 1 of the step-down circuit. In an optional embodiment, the first capacitor C1 is an electrolytic capacitor with a capacitance of 100μF.

[0046] Optional, continue to refer to Figure 1 As shown, the first filtering unit 5 further includes a second capacitor C2. The first capacitor C1 and the second capacitor C2 are connected in parallel. The first terminal of the second capacitor C2 is electrically connected to the positive terminal of the first capacitor C1, and the second terminal of the second capacitor C2 is electrically connected to the negative terminal of the first capacitor C1, so that the second capacitor C2 can effectively filter out high-frequency signals and pulse interference signals in the circuit. In an optional embodiment, the capacitance of the second capacitor C2 is 10μF.

[0047] Optional, continue to refer to Figure 1 As shown, the DC-DC step-down unit 6 includes a DC-DC step-down chip U1, a first inductor L1, a third capacitor C3, a first resistor R1, and a second resistor R2. The DC-DC step-down chip U1 includes an IN pin, a GND pin, a SW pin, and an FB pin. The IN pin is electrically connected to the input port, the GND pin is electrically connected to the ground electrode through the isolation unit 4, the SW pin is electrically connected to the output port through the first inductor L1, the first end of the first resistor R1 is electrically connected between the first inductor L1 and the output port, the second end of the first resistor R1 is electrically connected to the ground electrode through the second resistor R2 and the isolation unit 4, and the second end of the first resistor R1 is also electrically connected to the FB pin. The third capacitor C3 is connected in parallel with the first resistor R1.

[0048] The DC-DC step-down chip U1 is used to convert a higher voltage source received at the input port into a lower voltage source. In an exemplary embodiment, the DC-DC step-down chip U1 is a TMI3493DC-DC step-down chip manufactured by Tuoerwei Co., Ltd.

[0049] The SW pin is electrically connected to the output port through the first inductor L1. The first end of the first resistor R1 is electrically connected between the first inductor L1 and the output port. The second end of the first resistor R1 is electrically connected to the ground electrode through the second resistor R2 and the isolation unit 4, and is also electrically connected to the FB pin. This allows the voltage output from the SW pin to be fed back to the FB pin, enabling the DC-DC buck chip U1 to regulate its output voltage. Furthermore, by connecting the third capacitor C3 in parallel with the first resistor R1, the third capacitor C3 can suppress output voltage ripple, thereby improving the stability of the output voltage of the DC-DC buck unit 6.

[0050] In one exemplary embodiment, the first resistor R1 has a resistance of 100KΩ. The second resistor R2 has a resistance of 32.4KΩ. The second capacitor C2 has a capacitance of 1nF.

[0051] Optional, continue to refer to Figure 1 As shown, the second filter unit 7 includes a fourth capacitor C4. The positive terminal of the fourth capacitor C4 is electrically connected between the output port of the DC-DC buck unit 6 and the status indicator unit 8, and the negative terminal of the fourth capacitor C4 is electrically connected to the ground electrode through the isolation unit 4. Thus, the fourth capacitor C4 can prevent voltage changes in the buck circuit due to load variations, thereby making the voltage output from the buck circuit's output terminal 2 more stable. In an optional embodiment, the fourth capacitor C4 is an electrolytic capacitor with a capacitance of 220μF.

[0052] Optional, continue to refer to Figure 1As shown, the second filter unit 7 further includes a fifth capacitor C5 and a sixth capacitor C6. A fourth capacitor C4 is connected in parallel with the fifth capacitor C5 and the sixth capacitor C6. The first terminals of the fifth capacitor C5 and the sixth capacitor C6 are electrically connected to the positive terminal of the fourth capacitor C4, and the second terminals of the fifth capacitor C5 and the sixth capacitor C6 are electrically connected to the negative terminal of the fourth capacitor C4. This allows the fifth capacitor C5 and the sixth capacitor C6 to effectively filter out high-frequency signals and pulse interference signals in the circuit. In an optional embodiment, the capacitance of the fifth capacitor C5 is 0.1 μF, and the capacitance of the sixth capacitor C6 is 0.01 μF.

[0053] Optional, continue to refer to Figure 1 As shown, the status indicator unit 8 includes a light-emitting diode (LED) D2. The positive terminal of the LED D2 is electrically connected to the output port of the DC-DC step-down unit 6, and the negative terminal of the LED D2 is electrically connected to the ground electrode through the isolation unit 4. This allows the LED D2 to light up when the step-down circuit is working normally, i.e., when the voltage output terminal 2 outputs the stepped-down voltage normally. When the step-down circuit is not working normally, i.e., when the voltage output terminal 2 cannot output the stepped-down voltage normally, the status indicator unit 8 will not light up. In this way, the user can distinguish the working status of the step-down circuit by observing whether the LED D2 is lit or not.

[0054] Optional, continue to refer to Figure 1 As shown, the status indicator unit 8 also includes a third resistor R3. The positive terminal of the light-emitting diode D2 is electrically connected to the output port of the DC-DC step-down unit 6 through the third resistor R3, so that the third resistor R3 can protect the light-emitting diode D2 and prevent it from burning out. In an optional embodiment, the resistance value of the third resistor R3 is 510Ω.

[0055] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0056] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A step-down circuit, characterized in that, include: Voltage input terminal, voltage output terminal, reverse connection protection unit, isolation unit, first filter unit, DC-DC step-down unit, second filter unit, and status indication unit; The DC-DC step-down unit includes an input port and an output port; The voltage input terminal is electrically connected to the input port of the DC-DC step-down unit through the reverse connection protection unit and the first filter unit; the output port of the DC-DC step-down unit is electrically connected to the voltage output terminal through the second filter unit and the status indicator unit. The first filtering unit is also electrically connected to the ground electrode through the isolation unit.

2. The step-down circuit according to claim 1, characterized in that, The reverse connection protection unit includes a first diode; The positive terminal of the first diode is electrically connected to the voltage input terminal; the negative terminal of the first diode is electrically connected to the first filter unit.

3. The step-down circuit according to claim 1, characterized in that, The first filtering unit includes a first capacitor; The positive terminal of the first capacitor is electrically connected between the reverse connection protection unit and the input port of the DC-DC step-down unit, and the negative terminal of the first capacitor is electrically connected to the ground electrode through the isolation unit.

4. The step-down circuit according to claim 3, characterized in that, The first filtering unit further includes a second capacitor; The first capacitor and the second capacitor are connected in parallel. The first terminal of the second capacitor is electrically connected to the positive terminal of the first capacitor, and the second terminal of the second capacitor is electrically connected to the negative terminal of the first capacitor.

5. The step-down circuit according to claim 1, characterized in that, The DC-DC buck unit includes a DC-DC buck chip, a first inductor, a third capacitor, a first resistor, and a second resistor; The DC-DC step-down chip includes an IN pin, a GND pin, an SW pin, and an FB pin; The IN pin is electrically connected to the input port, and the GND pin is electrically connected to the ground electrode through the isolation unit; the SW pin is electrically connected to the output port through the first inductor; the first end of the first resistor is electrically connected between the first inductor and the output port, the second end of the first resistor is electrically connected to the ground electrode through the second resistor and the isolation unit, and the second end of the first resistor is also electrically connected to the FB pin; the third capacitor is connected in parallel with the first resistor.

6. The step-down circuit according to claim 1, characterized in that, The second filter unit includes a fourth capacitor; The positive terminal of the fourth capacitor is electrically connected between the output port of the DC-DC step-down unit and the status indicator unit, and the negative terminal of the fourth capacitor is electrically connected to the ground electrode through the isolation unit.

7. The step-down circuit according to claim 6, characterized in that, The second filter unit also includes a fifth capacitor and a sixth capacitor; The fourth capacitor, the fifth capacitor, and the sixth capacitor are connected in parallel. The first terminal of the fifth capacitor and the first terminal of the sixth capacitor are electrically connected to the positive terminal of the fourth capacitor, and the second terminal of the fifth capacitor and the second terminal of the sixth capacitor are electrically connected to the negative terminal of the fourth capacitor.

8. The step-down circuit according to claim 1, characterized in that, The status indication unit includes a light-emitting diode; The positive terminal of the light-emitting diode is electrically connected to the output port of the DC-DC step-down unit, and the negative terminal of the light-emitting diode is electrically connected to the ground electrode through the isolation unit.

9. The step-down circuit according to claim 8, characterized in that, The status indication unit also includes a third resistor; The positive terminal of the light-emitting diode is electrically connected to the output port of the DC-DC step-down unit through the third resistor.

10. The step-down circuit according to claim 1, characterized in that, The isolation unit includes a fourth resistor, the first end of which is electrically connected to the first filter unit, and the second end of which is electrically connected to the ground electrode.

Images