Voltage stabilizing circuit, controller and electric equipment

Abstract

The utility model relates to the technical field of voltage stabilizing circuits, and particularly provides a voltage stabilizing circuit, a controller and electric equipment. The switch module is connected with the input end; the switch module comprises a first MOS (Metal Oxide Semiconductor) tube; the grid electrode of the first MOS tube is connected with a PWM control end; the voltage reduction module is connected with the switch module; the voltage stabilizing module comprises a second MOS tube and a voltage stabilizing diode; the grid electrode of the second MOS tube is connected with the voltage reduction module and the negative electrode of the voltage stabilizing diode. The positive electrode of the voltage stabilizing diode is grounded; and the output end is connected with the voltage stabilizing module. According to the utility model, the first MOS tube is used as a circuit switch, so that large current can pass through; a step-down module is configured, so that heating loss is reduced, and elements are prevented from being burnt due to overcurrent; the second MOS tube and the voltage stabilizing diode are used in cooperation to provide stable voltage for the output end, a voltage stabilizing chip does not need to be used, and the low cost and the high stability are achieved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage stabilizing circuits, in particular to a voltage stabilizing circuit, a controller and an electrical device. Background Art

[0002] A voltage stabilizing circuit refers to a circuit that can still maintain a constant output voltage when the input voltage, load, ambient temperature, circuit parameters, etc. change.

[0003] When the existing voltage stabilizing circuit is applied to life scenarios, such as powering a vacuum cleaner, a mobile phone, a DC small electric fan, etc., problems such as overcurrent and large heat dissipation losses need to be considered. In addition, although a voltage stabilizing chip can be directly used to achieve voltage stabilization, the cost will be greatly increased, and the stability of the auxiliary circuit will also be reduced. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the voltage stabilizing circuit in the prior art cannot take into account preventing overcurrent, reducing heat dissipation losses, lower cost and higher stability when applied to life scenarios, and provide a voltage stabilizing circuit, a controller and an electrical device, which can prevent overcurrent from burning out components while passing a large current, and has the advantages of lower heat dissipation losses, lower cost and higher stability.

[0005] In a first aspect, to solve the above technical problem, the utility model provides a voltage stabilizing circuit, including: an input terminal; a switching module connected to the input terminal; the switching module includes a first MOS transistor; the gate of the first MOS transistor is connected to a PWM control terminal; a buck module connected to the switching module; a voltage stabilizing module including a second MOS transistor and a voltage stabilizing diode; the gate of the second MOS transistor is respectively connected to the buck module and the negative electrode of the voltage stabilizing diode; the positive electrode of the voltage stabilizing diode is grounded; an output terminal connected to the voltage stabilizing module.

[0006] In an embodiment of the utility model, the buck module includes a first resistor and a second resistor; the first end of the first resistor is connected to the switching module, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the negative electrode of the voltage stabilizing diode.

[0007] In an embodiment of the utility model, it further includes a first diode; the positive electrode of the first diode is connected to the second end of the first resistor, and the negative electrode of the first diode is connected to the first end of the second resistor.

[0008] In an embodiment of the utility model, the second MOS transistor is an NMOS transistor, and the source of the second MOS transistor is connected to the output terminal.

[0009] In an embodiment of the present utility model, the gate-source voltage difference of the second MOS transistor is 1V; the Zener voltage of the Zener diode is 6V.

[0010] In an embodiment of the present utility model, the output voltage of the output terminal is 5V.

[0011] In an embodiment of the present utility model, a capacitor is further included; a first end of the capacitor is connected to the output terminal, and a second end of the capacitor is grounded.

[0012] Second, to solve the above technical problems, the present utility model further provides a controller, including the voltage stabilizing circuit described above.

[0013] Third, to solve the above technical problems, the present utility model further provides an electrical equipment, including the controller described above.

[0014] In an embodiment of the present utility model, the electrical equipment includes a vacuum cleaner and a mobile phone.

[0015] The above technical solutions of the present utility model have at least the following advantages compared with the prior art:

[0016] For the voltage stabilizing circuit, controller and electrical equipment of the present utility model, a first MOS transistor is used as a switch of the circuit, which can pass a large current; a buck module is configured to reduce heat loss and prevent components from being burned out by overcurrent; the second MOS transistor and the Zener diode are used in combination to provide a stable voltage to the output terminal, without using a voltage stabilizing chip, which has a lower cost and higher stability. Description of the Drawings

[0017] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to the specific embodiments of the present utility model and in conjunction with the drawings.

[0018] Figure 1 It is a schematic diagram of a voltage stabilizing circuit in a preferred embodiment of the present utility model.

[0019] Explanation of the reference numerals in the drawings:

[0020] Q1 is the first MOS transistor; Q2 is the second MOS transistor;

[0021] PWM-Control: Pulse Width Modulation (abbreviated as PWM) control terminal;

[0022] R1 is the first resistor; R2 is the second resistor;

[0023] D1 is the first diode; D2 is the Zener diode; C1 is the capacitor. Specific Embodiments

[0024] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited are not intended to limit the present utility model.

[0025] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meaning of the above terms in this application can be understood according to specific circumstances.

[0026] In addition, in this application, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0027] When existing voltage stabilizing circuits are applied in life scenarios, such as when powering vacuum cleaners, mobile phones, DC small motors, etc., problems such as overcurrent and large heat losses need to be considered. In addition, although a voltage stabilizing chip can be directly used to achieve voltage stabilization, the cost will increase significantly, and the stability of the auxiliary circuit will also be reduced.

[0028] For this reason, the embodiments of this application provide a voltage stabilizing circuit, a controller, and an electrical device.

[0029] Embodiment 1

[0030] This embodiment provides a voltage stabilizing circuit, including:

[0031] An input terminal;

[0032] A switching module, which is connected to the input terminal; the switching module includes a first MOS transistor; the gate of the first MOS transistor is connected to the PWM control terminal;

[0033] A buck module, which is connected to the switching module;

[0034] A voltage stabilizing module, including a second MOS transistor and a voltage stabilizing diode; the gate of the second MOS transistor is respectively connected to the buck module and the negative electrode of the voltage stabilizing diode; the positive electrode of the voltage stabilizing diode is grounded;

[0035] An output terminal, which is connected to the voltage stabilizing module.

[0036] A voltage stabilizing circuit provided in this embodiment uses a first MOS transistor to control the conduction and cutoff of the entire circuit, allowing a large current to pass through; it is configured with a buck module, which reduces heat loss and can prevent components from being burned out due to overcurrent; by using the second MOS transistor and the voltage stabilizing diode in combination, a stable voltage can be provided to the output terminal without using a voltage stabilizing chip, resulting in lower costs and higher stability; the power output can be controlled through PWM regulation of an external circuit to meet the current requirements of different loads at the output terminal.

[0037] Next, a detailed introduction to a voltage stabilizing circuit described in this embodiment will be given. Specifically, please refer to Figure 1 shown as follows:

[0038] I. Switching module

[0039] Specifically, the switching module includes a first MOS transistor Q1.

[0040] Optionally, the first MOS transistor Q1 is an NMOS transistor.

[0041] Furthermore, the drain of the first MOS transistor Q1 is connected to the input terminal, the source of the first MOS transistor Q1 is connected to the buck module, and the gate of the first MOS transistor Q1 is connected to the PWM control terminal of the external circuit.

[0042] Specifically, when the PWM control terminal outputs a high level, the first MOS transistor Q1 conducts; when the PWM control terminal outputs a low level, the first MOS transistor Q1 cuts off.

[0043] Specifically, the switching module allows a large current to pass through, and through PWM regulation, the conduction, cutoff, and output power of a voltage stabilizing circuit described in this embodiment can be controlled.

[0044] II. Buck module

[0045] Optionally, the buck module includes a first resistor R1 and a second resistor R2.

[0046] Specifically, the first end of the first resistor R1 is connected to the switching module, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the negative electrode of the voltage stabilizing diode D2, and the positive electrode of the voltage stabilizing diode D2 is grounded.

[0047] Specifically, the first end of the first resistor R1 is connected to the source of the first MOS transistor Q1.

[0048] Optionally, a first diode D1 is also connected in series between the second end of the first resistor R1 and the first end of the second resistor R2;

[0049] Specifically, the positive electrode of the first diode D1 is connected to the second end of the first resistor R1, and the negative electrode of the first diode D1 is connected to the first end of the second resistor R2.

[0050] Furthermore, the negative electrode of the first diode D1 is also connected to the second MOS transistor Q2.

[0051] Specifically, the first resistor R1 can prevent the second MOS transistor Q2 from being burned out by overcurrent, the second resistor R2 can divide the voltage and limit the current so that the voltage across the voltage stabilizing diode D2 will not be too large, and the first diode D1 can block the reverse current impact from the second MOS transistor Q2 to the first MOS transistor Q1.

[0052] III. Voltage Stabilizing Module

[0053] Specifically, the voltage stabilizing module includes the voltage stabilizing diode D2 and the second MOS transistor Q2.

[0054] Optionally, the second MOS transistor Q2 is an NMOS transistor.

[0055] Furthermore, the drain of the second MOS transistor Q2 is connected to the negative electrode of the first diode D1; the gate of the second MOS transistor Q2 is respectively connected to the second end of the second resistor R2 and the negative electrode of the voltage stabilizing diode D2; the source of the second MOS transistor Q2 is connected to the output terminal.

[0056] Specifically, the voltage stabilizing diode D2 stabilizes the gate voltage of the second MOS transistor Q2 according to its own Zener voltage.

[0057] Optionally, a voltage stabilizing circuit according to this embodiment further includes a capacitor C1.

[0058] Specifically, the first end of the capacitor C1 is connected to the output terminal, the second end of the capacitor C1 is grounded, and the capacitor C1 filters the stable voltage provided by the voltage stabilizing module to the output terminal.

[0059] IV. Voltage Stabilizing Principle

[0060] Exemplarily, taking a 2-series rechargeable battery pack of a Type-C interface as an example, the output voltage of the battery pack is 7.2V to 7.4V.

[0061] Specifically, the positive electrode of the battery pack is connected to the input terminal of a voltage stabilizing circuit according to this embodiment.

[0062] Optionally, the stable voltage of a voltage stabilizing circuit according to this embodiment is determined to be 5V.

[0063] Optionally, select the zener diode D2 so that its zener voltage is 6V, and select the second MOS transistor Q2 so that the gate-source voltage difference thereof is 1V.

[0064] Exemplarily, during normal operation, current flows into the input terminal of the voltage stabilizing circuit according to this embodiment from the positive electrode of the battery pack. Turn on the first MOS transistor Q1. After passing through the first resistor R1, the first diode D1, and the second resistor R2, the voltage applied across the zener diode D2 is higher than its zener voltage of 6V. The zener diode D2 operates, the gate voltage of the second MOS transistor Q2 is 6V, and the second MOS transistor Q2 enters a semi-conducting state. Since the gate-source voltage difference of the second MOS transistor Q2 is 1V, the stable voltage at the output terminal is 5V.

[0065] Obviously, as long as the zener voltage of the zener diode D2 is 5V higher than the gate-source voltage difference of the second MOS transistor Q2, the requirement of a stable voltage of 5V can be achieved.

[0066] Embodiment 2

[0067] This embodiment provides a controller, including a voltage stabilizing circuit as described in Embodiment 1.

[0068] For the introduction of the controller provided in this embodiment, please refer to Embodiment 1, and details are not described herein again.

[0069] The controller provided in this embodiment has the same beneficial effects as the above-mentioned voltage stabilizing circuit.

[0070] Embodiment 3

[0071] This embodiment provides an electrical device, including a controller as described in Embodiment 2.

[0072] Specifically, the electrical device may be, but is not limited to, a vacuum cleaner, a mobile phone, and a DC small electric fan.

[0073] Furthermore, any device configured with a DC small motor can be used as the electrical device described in this embodiment.

[0074] For the further introduction of the electrical device provided in this embodiment, please refer to Embodiment 1, and details are not described herein again.

[0075] The electrical device provided in this embodiment has the same beneficial effects as the above-mentioned voltage stabilizing circuit.

[0076] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the creation of the present utility model.

Claims

1. A voltage stabilizing circuit, characterized in that: include: Input terminal; A switch module connected to the input end; the switch module includes a first MOS tube; the gate of the first MOS tube is connected to the PWM control end; A step-down module connected to the switch module; A voltage stabilizing module, comprising a second MOS tube and a voltage stabilizing diode; the gate of the second MOS tube is respectively connected to the voltage step-down module and the cathode of the voltage stabilizing diode; the anode of the voltage stabilizing diode is grounded; An output terminal is connected to the voltage stabilizing module.

2. A voltage stabilizing circuit according to claim 1, characterized in that: The step-down module includes a first resistor and a second resistor; the first end of the first resistor is connected to the switch module, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the cathode of the voltage-stabilizing diode.

3. A voltage stabilizing circuit according to claim 2, characterized in that: It also includes a first diode; the anode of the first diode is connected to the second end of the first resistor, and the cathode of the first diode is connected to the first end of the second resistor.

4. A voltage stabilizing circuit according to claim 1, characterized in that: The second MOS tube is an NMOS tube, and a source of the second MOS tube is connected to the output end.

5. A voltage stabilizing circuit according to claim 4, characterized in that: The gate-source voltage difference of the second MOS tube is 1V; the Zener voltage of the voltage regulator diode is 6V.

6. A voltage stabilizing circuit according to claim 5, characterized in that: The output voltage of the output terminal is 5V.

7. A voltage stabilizing circuit according to claim 1, characterized in that: It also includes a capacitor; a first end of the capacitor is connected to the output end, and a second end of the capacitor is grounded.

8. A controller, characterized in that: It comprises a voltage stabilizing circuit as described in any one of claims 1 to 7.

9. An electrical device, characterized in that: Comprising a controller as claimed in claim 8.

10. An electrical equipment according to claim 9, characterized in that: The electrical appliances include vacuum cleaners and mobile phones.

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