Low-power-consumption self-hold circuit
By designing a low-power self-holding circuit including resistors, diodes and transistors, the existing key circuits have solved the problem of large power consumption and poor compatibility, and the effects of low power consumption and high compatibility are achieved.
Patent Information
- Application Number
- CN202420562514.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-22
AI Technical Summary
The existing button circuits have large power consumption and poor compatibility, making it difficult to meet the needs of low power consumption and high compatibility.
A low-power self-holding circuit is designed, consisting of components such as resistors, diodes and transistors. Through voltage divider circuits and switch control, a button start circuit with zero power consumption is realized.
A significant reduction in circuit power consumption is achieved, even close to zero power consumption, improve compatibility, and reduce costs and failure rates.
Smart Images
Figure CN222582405U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of key circuits, in particular to a low-power self-holding circuit. Background Art
[0002] The key circuit can convert the key operation into a digital signal, thereby transmitting instructions to electronic devices. The key circuit is used in many places. For example, pressing a letter key on a computer keyboard can send letter information to the computer for input. The existing key circuit consumes a lot of power and has poor compatibility. Utility Model Content
[0003] The purpose of the utility model is to provide a low-power self-holding circuit to solve the problems raised in the above background technology.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A low-power self-holding circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, a transistor Q2, a transistor Q5 and a switch S1, wherein one end of the resistor R1 is connected to the collector of the transistor Q5 and a power source VIN, the other end of the resistor R1 is connected to the resistor R2 and the base of the transistor Q5, the other end of the resistor R2 is connected to the anode of the diode D2 and the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the PW-EN pin of a chip, the other end of the resistor R4 is connected to the emitter of the transistor Q2 and a ground terminal, the cathode of the diode D2 is connected to the cathode of the diode D1 and the switch S1, the other end of the switch S1 is grounded, and the anode of the diode D1 is connected to the KEY-IN pin of the chip.
[0006] As a further technical solution of the utility model: the transistor Q2 is an NPN transistor.
[0007] As a further technical solution of the utility model: the transistor Q5 is a PNP transistor.
[0008] As a further technical solution of the present utility model: the switch S1 is a push button switch.
[0009] As a further technical solution of the utility model: the resistor R1 and the resistor R2 form a voltage divider circuit, and the resistor R3 and the resistor R4 form a voltage divider circuit.
[0010] Compared with the prior art, the beneficial effects of the utility model are:
[0011] The low power consumption button start circuit of the utility model can greatly reduce the power consumption of the circuit, and can even be called zero power consumption. It is controlled by a chip and can be powered off at any time, which further meets customer needs. On the other hand, it can also reduce costs and reduce failure rates. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is the principle diagram of the utility model. DETAILED DESCRIPTION
[0013] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0014] Reference Figure 1 A low-power self-holding circuit includes a transistor Q4, a transistor Q7, a transistor Q10, a transistor Q12, a diode D28, a resistor R25, a resistor R26, a resistor R28, a resistor R35, a resistor R35, a resistor R50, a resistor R73, a resistor R74 and a resistor R76, wherein one end of the resistor R35 is connected to a signal end TXD_MCU, the other end of the resistor R35 is connected to the other end of the resistor R25 and the base of the transistor Q4, the emitter of the transistor Q4 is connected to the other end of the resistor R25, the collector of the transistor Q4 is connected to the resistor R73 and the base of the transistor Q10, and the resistor R74 is connected to the base of the transistor Q10. The other end is connected to the emitter of transistor Q10, resistor R76 and the emitter of transistor Q12, the collector of transistor Q10 is connected to the anode of diode D28 and the external single line COM_C, the cathode of diode D28 is connected to resistor R50, the other end of resistor R50 is connected to resistor R76 and the base of transistor Q12, the collector of transistor Q12 is connected to resistor R26 and the base of transistor Q7, the other end of resistor R26 is connected to the emitter of transistor Q7, the collector of transistor Q7 is connected to resistor R73, and the other end of resistor R73 is connected to the signal terminal RXD_MCU and the ground terminal GND_MCU.
[0015] Wherein, the transistor Q2 is an NPN transistor and the transistor Q5 is a PNP transistor.
[0016] Here’s how it works:
[0017] VIN is the power input, S1 is the key switch, and D1 and D2 are diodes. When the key switch S1 is pressed, the KEY-IN pin of the chip detects the signal, transistor Q5 turns on, and the power supply starts. The PW-EN pin of the chip outputs a low level, and transistor Q5 is continuously turned on, thus ensuring that even if the key is released, there will still be a steady supply of power to the microcontroller VCC. The chip can power off by itself. When it is not needed, the PW-EN pin of the chip is pulled high, and transistor Q5 will be turned off, and the chip will not be powered.
[0018] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.
[0019] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.
Claims
1. A low power self-holding circuit, comprising a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, a transistor Q2, a transistor Q5 and a switch S1, characterized in that: One end of the resistor R1 is connected to the collector of the transistor Q5 and the power supply VIN, the other end of the resistor R1 is connected to the resistor R2 and the base of the transistor Q5, the other end of the resistor R2 is connected to the anode of the diode D2 and the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the PW-EN pin of the chip, the other end of the resistor R4 is connected to the emitter of the transistor Q2 and the ground terminal, the cathode of the diode D2 is connected to the cathode of the diode D1 and the switch S1, the other end of the switch S1 is grounded, and the anode of the diode D1 is connected to the KEY-IN pin of the chip.
2. A low power consumption self-holding circuit according to claim 1, characterized in that: The transistor Q2 is an NPN transistor.
3. A low power consumption self-holding circuit according to claim 1, characterized in that: The transistor Q5 is a PNP transistor.
4. A low power consumption self-holding circuit according to claim 1, characterized in that: The switch S1 is a push button switch.
5. A low power consumption self-holding circuit according to claim 4, characterized in that: The resistor R1 and the resistor R2 form a voltage divider circuit, and the resistor R3 and the resistor R4 form a voltage divider circuit.