Low power start-up circuit
By using a control module combining MOSFETs and transistors in a low-power circuit, and controlling the gate voltage through a switching module, the problem of complex circuit control in the prior art is solved, achieving low-power and high-efficiency circuit power supply control.
Patent Information
- Application Number
- CN202422877556.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing low-power circuit designs are relatively complex in microcontroller control circuits, making it difficult to achieve simple and efficient circuit power supply control.
A control module combining field-effect transistors and transistors is used. The gate voltage of the field-effect transistors is controlled by a switching module, and the circuit is turned on and off by combining the high and low levels output by the MCU, thus optimizing the circuit structure.
It achieves convenient and sensitive low-power control, simplifies circuit design, and reduces energy consumption.
Smart Images
Figure CN223613064U_ABST
Abstract
Description
Technical Field
[0001] This application generally relates to the technical field of low-voltage electrical appliances, and more specifically, to a low-power startup circuit. Background Technology
[0002] Portable batteries offer advantages such as economy, environmental friendliness, ease of use, and suitability for emergency situations, and are now widely used across various industries. Low-power circuit design is a crucial branch of electronic engineering. The goal of low-power design is to reduce energy consumption in both operating and standby modes, thereby extending battery life or lowering energy costs. Existing low-power circuits largely revolve around microcontroller-based circuit design, which presents the problem of complex control circuitry. Utility Model Content
[0003] A primary objective of this application is to provide a low-power startup circuit that controls the power supply of the entire circuit by setting a field-effect transistor in the control module, thereby effectively optimizing the circuit and overcoming, to at least some extent, one or more problems caused by the limitations and defects of related technologies.
[0004] To achieve the above-mentioned objectives, this application adopts the following technical solution:
[0005] According to one aspect of this application, a low-power startup circuit is provided. The startup circuit includes a battery, a control module, and a switch module. The battery is connected to the control module, the switch module is connected to the control module, and the output terminal of the control module is used to connect to a load. The control module includes an MCU, a field-effect transistor (FET), and a transistor. The drain of the FET is used to connect to the load, the source of the FET is connected to the battery, the gate of the FET is connected to the switch module, the base of the transistor is connected to the MCU, and the collector of the transistor is connected to the gate of the FET.
[0006] When the switch module is closed, the gate voltage of the field-effect transistor changes, the field-effect transistor is turned on, the MCU receives power, the MCU outputs a high level to the transistor, the transistor is turned on, and the field-effect transistor remains on.
[0007] When the switching module is disconnected, the MCU outputs a low level to the transistor, the transistor is turned off, the voltage at the gate of the field-effect transistor is the same as the voltage at the source of the field-effect transistor, and the field-effect transistor is turned off.
[0008] According to one embodiment of this application, the control module further includes a capacitor C3, one end of which is connected to the gate of the field-effect transistor, and the other end of which is connected to the switching module and connected to the battery voltage.
[0009] According to an embodiment of the present application, the switch module comprises a toggle switch S1 and a capacitor C2 connected in parallel, one end of which is connected to one end of the capacitor C3, and the other end of which is grounded.
[0010] According to an embodiment of the present application, the switch module further comprises a diode D1 and a resistor R4 connected in series, one end of the diode D1 is connected to one end of the toggle switch S1, and the other end of the resistor R4 is connected to a power supply voltage.
[0011] According to an embodiment of the present application, a resistor R1 is connected between the gate and the source of the field effect tube.
[0012] According to an embodiment of the present application, a capacitor C1 is connected in parallel to the battery.
[0013] According to an embodiment of the present application, a diode D2 and a resistor R5 are connected in series between the MCU and the base of the triode.
[0014] According to an embodiment of the present application, a resistor R6 is connected between the base and the emitter of the triode.
[0015] In the present application, by setting a field effect tube and a triode in the control module, changing the voltage of the gate of the field effect tube when the switch module is closed, thereby turning on the power supply circuit, and further outputting a high level by the MCU to turn on the triode and the field effect tube in turn, thereby realizing continuous power supply. The circuit structure is effectively optimized, and has the advantages of low power consumption control, convenience and sensitivity.
[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS
[0017] The above and other features and advantages of the present application will become more apparent from the following detailed description of exemplary embodiments thereof, with reference to the attached drawings.
[0018] Figure 1 is a structural schematic diagram of a low-power start-up circuit according to an exemplary embodiment;
[0019] Figure 2 is a schematic diagram of a low-power start-up circuit according to an exemplary embodiment.
[0020] In which, the reference signs are explained as follows:
[0021] P1, battery; 1, control module; 2, switch module; X, load. DETAILED DESCRIPTION
[0022] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the various figures, so that detailed descriptions of the figures are omitted for clarity.
[0023] Referring to Figure 1 In an embodiment, the low-power starting circuit includes a battery, a control module 1 and a switch module 2. The battery is connected to the control module 1, the switch module 2 is connected to the control module 1, and an output terminal of the control module 1 is used to connect a load X.
[0024] Referring to Figure 2 In an embodiment, the control module 1 includes an MCU, a field effect transistor Q1 and a triode Q2, a drain D of the field effect transistor Q1 is used to connect the load X, a source G of the field effect transistor Q1 is connected to the battery P1, a gate S of the field effect transistor Q1 is connected to the switch module 2, a base of the triode Q2 is connected to the MCU, and a collector of the triode Q2 is connected to the gate S of the field effect transistor Q1. When the switch module 2 is closed, the gate voltage of the field effect transistor Q1 changes, the field effect transistor Q2 is turned on, the MCU obtains power supply, the MCU outputs a high level to the triode Q2, the triode Q2 is turned on, and the field effect transistor Q1 is continuously turned on. When the switch module 2 is opened, the MCU outputs a low level to the triode Q2, the triode Q2 is turned off, the voltage of the gate G of the field effect transistor Q1 is the same as the voltage of the source of the field effect transistor Q2, and the field effect transistor Q1 is turned off.
[0025] Referring to Figure 2 In a specific embodiment, the negative electrode of the battery P1 is grounded. The positive and negative electrodes of the battery P1 are connected in parallel with a capacitor C1, and the capacitor C1 can play a filtering role.
[0026] In a specific embodiment, the field effect transistor Q1 can be a P-groove field effect transistor, and specifically can be a CMSC60P03DFN-8 type. The source S of the field effect transistor Q1 is connected to the battery voltage VBAT, and the drain D of the field effect transistor Q1 outputs a power supply voltage PwrR, so that the drain D can be connected to the load X to supply power to the load X. The source S and the gate G of the field effect transistor Q1 are connected with a resistor R1, the resistor R1 can provide a stable bias voltage for the field effect transistor Q1, helping the field effect transistor Q1 to work better, and the resistance value of the resistor R1 can be 100K ohms.
[0027] The triode Q2 can be 2N3904. The emitter of the triode Q2 is connected to the ground, and the resistor R6 is connected between the base and the emitter of the triode Q2. The collector of the triode Q2 is connected to the gate D of the field effect tube Q1, and the resistor R2 is connected between the triode Q2 and the field effect tube Q1. The resistor R2 can be 1M ohm. The base of the triode Q2 is connected to the MCU, and the diode D2 and the resistor R5 are connected in series between the triode Q2 and the MCU. The diode D2 can be of the type 1N4148. The input end of the resistor R5 is connected to the diode D3, the diode D3 is turned on towards the resistor R5, and the input end of the diode D3 is connected to the direct current DC+.
[0028] The control module 1 further comprises the capacitor C3, one end of the capacitor C3 is connected to the gate G of the field effect tube Q1, the other end of the capacitor C3 is connected to the switch module 2, and the battery voltage VBAT is connected to the capacitor C3. The resistor R3 is connected between the battery voltage VBAT and the capacitor C3.
[0029] The switch module 2 comprises the toggle switch S1 and the capacitor C2 connected in parallel, one end of the parallel connection of the toggle switch S1 and the capacitor C2 is connected to one end of the capacitor C3, and the other end of the parallel connection of the toggle switch S1 and the capacitor C2 is connected to the ground.
[0030] The switch module 2 further comprises the diode D1 and the resistor R4 connected in series, the other end of the diode D1 is connected to one end of the capacitor C3 connected to the capacitor C2, the other end of the resistor R4 is connected to the power supply voltage VCC, the voltage value of VCC can be 5V, and the power supply voltage VCC can supply power to the capacitor C3 and the capacitor C2.
[0031] The above is only a preferred embodiment of the application, and is not used to limit the application. For those skilled in the art, the application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.
Claims
1. A low power start-up circuit, characterized by, The starting circuit comprises a battery, a control module and a switch module, the battery is connected to the control module, the switch module is connected to the control module, an output end of the control module is used for connecting a load, the control module comprises an MCU, a field effect tube and a triode, a drain of the field effect tube is used for connecting the load, a source of the field effect tube is connected to the battery, a gate of the field effect tube is connected to the switch module, a base of the triode is connected to the MCU, a collector of the triode is connected to the gate of the field effect tube. When the switch module is closed, the gate voltage of the field effect tube changes, the field effect tube is turned on, the MCU obtains power supply, the MCU outputs a high level to the triode, the triode is turned on, and the field effect tube is continuously turned on. When the switch module is disconnected, the MCU outputs a low level to the triode, the triode is turned off, the voltage of the gate of the field effect tube is the same as the voltage of the source of the field effect tube, and the field effect tube is turned off.
2. The low power start-up circuit of claim 1, wherein, The control module further comprises a capacitor C3, one end of the capacitor C3 is connected to the gate of the field effect tube, and the other end of the capacitor C3 is connected to the switch module and connected to the battery voltage.
3. The low power start-up circuit of claim 2, wherein, The switch module comprises a toggle switch S1 and a capacitor C2 connected in parallel, one end of the capacitor C3 connected in parallel is connected to one end of the capacitor C3, and the other end of the parallel connection is grounded.
4. The low power start-up circuit of claim 3, wherein, The switch module further comprises a diode D1 and a resistor R4 connected in series, the other end of the diode D1 is connected to one end of the toggle switch S1, and the other end of the resistor R4 is connected to the power supply voltage.
5. The low power start-up circuit of claim 1, wherein, The gate and the source of the field effect tube are connected with a resistor R1.
6. The low power start-up circuit of claim 1, wherein, The battery is connected with a capacitor C1 in parallel.
7. The low power start-up circuit of claim 1, wherein, The MCU and the base of the triode are connected with a diode D2 and a resistor R5 in series.
8. The low power start-up circuit of claim 1, wherein, The base and the emitter of the triode are connected with a resistor R6.