Circuit with low-power-consumption switching-on and switching-off functions

Abstract

The utility model provides a circuit with a low-power-consumption startup and shutdown function, which belongs to the technical field of low-power-consumption startup and shutdown circuits, and comprises a VCC (virtual channel connection) used as an input system power supply and connected with a power supply input end; the PWR is an output controlled power supply and is connected with a controlled end; r6 and D1 represent a load output end or a power supply power-on indicating circuit, which is a simplified load circuit design; s1 is a lock-free light touch key or a light touch switch, hereinafter referred to as a key; the soft start and hardware start functions of circuit startup and shutdown can be realized in a single hardware circuit mode, the circuit is simple and stable, the manufacturing cost is low, the standby power consumption of the whole system is low, the whole system can realize power control on an output end by selecting Q3 with different powers through a switch different from a mechanical switch, and the power consumption is low. And the key does not bear large current, so that the key has multiple selectable sizes and models, and the service life is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-power switching, and particularly relates to a circuit with a low-power on-off function. Background Art

[0002] The circuit design of the low-power on-off function mainly focuses on how to effectively manage the power supply when the device is turned on and off to reduce unnecessary energy consumption. The circuit design of the low-power on-off function needs to comprehensively consider multiple aspects such as power management, microcontroller design, switch button design, and low-power design strategies. Through reasonable circuit design and optimization strategies, the low-power on-off function of the device can be realized, improving the energy efficiency ratio and service life of the device. Currently, in the switch power supply design of some circuits, it mainly relies on the MCU control core to realize functions such as soft on-off of the circuit, that is, the MCU controls the switching tube to cut off the power supply.

[0003] However, because it is a soft shutdown, the MCU does not achieve true power-off, and the power consumption of the entire system is high. For the mechanical traditional switch, since the switch needs to be displaced to achieve switching, the user experience and in the increasingly miniaturized structural design, the size and displacement limitations of the switch are becoming more and more strict. After the MCU fails and becomes uncontrollable, it is impossible to effectively restart the entire system circuit, resulting in the reasons: the MCU cannot directly cut off the power, otherwise the entire circuit will not be able to achieve soft start or one-key soft start, but the MCU being always powered on will consume a large amount of current to maintain the low-power operation of the MCU, the mechanical damping performance decreases or disappears over time, and because of the size limitation of the mechanical type, it is impossible to control large current in a smaller volume. After the MCU fails, the switching tube responsible for the power supply of the entire system will no longer be controlled, so it is impossible to perform the restart or power-off function of the entire circuit.

[0004] Therefore, it is necessary to provide a circuit with a low-power on-off function to solve the above technical problems. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides a circuit with a low-power on-off function.

[0006] The circuit with a low-power on-off function provided by the utility model includes:

[0007] VCC, which is the input system power supply and is connected to the power input terminal;

[0008] PWR, which is the output controlled power supply and is connected to the controlled terminal;

[0009] R6 and D1 represent the load output terminal or the power-on indication circuit of the power supply. Here is a simplified load circuit design;

[0010] S1 is a non-locking tactile button or tactile switch, hereinafter referred to as the button.

[0011] Q1 is a D-type flip-flop, and the operating state current of the chip is 1-2 μA.

[0012] Q3 is a power-type PMOS transistor. Without considering the power of the front-end input power supply, the power of the entire back-end output circuit can be achieved by selecting Q3 with different powers.

[0013] The MCU controller is the control core of the entire system. After connecting to other resources through the IO port, it conducts communication or control.

[0014] C5 is a filtering capacitor near the MCU.

[0015] Preferably, the front end of Q3 is filtered by C2 / C4 as filtering capacitors to achieve power supply filtering for input and back-end output.

[0016] The MCU controller is the control core of the entire system. After connecting to other resources through the IO port, it conducts communication or control.

[0017] The C5 is a filtering capacitor near the MCU.

[0018] Preferably, the inside of Q1 consists of 2 input terminals and 2 output terminals. The 2 input terminals are D input and clock input, and the 2 output terminals are Q output and Q-bar output.

[0019] Preferably, Q1 transfers the level state of the D input to the Q output terminal, that is, the level of the Q output terminal is the same as that of the D input terminal.

[0020] Preferably, when the clock signal is at the falling edge, Q1 will maintain the previous state, and the level of the Q output terminal remains unchanged. When the clock signal is at the rising edge again, and Q1 will update the level of the Q output terminal according to the new D input level.

[0021] Preferably, the Q-bar output terminal of Q1 is the inverted signal of the Q output terminal.

[0022] Compared with the related technology, a circuit with a low-power on / off function provided by the present invention has the following beneficial effects:

[0023] 1. A circuit with a low-power on / off function realizes the soft start and hardware start functions of circuit on / off in the form of a single hardware circuit. The circuit is simple and stable, with low manufacturing cost and low standby power consumption of the entire system.

[0024] 2. A circuit with a low-power on-off function. Different from a mechanical switch, the entire system can control the power at the output end by selecting Q3 with different powers. Since the button does not bear large currents, there are many optional sizes and models, and its service life is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the overall circuit of the present invention;

[0026] Figure 2 Schematic diagram of the connection structure of the MUC controller of the present invention;

[0027] Figure 3 Truth table of Q1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 to 3 , a circuit with a low-power on-off function provided by an embodiment of the present invention, including:

[0030] VCC, the input system power supply, connected to the power input terminal;

[0031] PWR, the output controlled power supply, connected to the controlled terminal;

[0032] R6 and D1 represent the load output terminal or the power-on indication circuit of the power supply. Here is a simplified load circuit design;

[0033] S1, a non-locking tactile button or tactile switch, hereinafter referred to as a button;

[0034] Q1, a D-type flip-flop, and the operating current of the chip is 1-2 μA;

[0035] Q3, a power-type PMOS transistor. Without considering the power of the front-end input power supply, the power of the entire back-end output circuit can be achieved by selecting Q3 with different powers;

[0036] The MCU controller is the control core of the entire system. After being connected to other resources through the IO port, it conducts communication or control;

[0037] C5 is a filter capacitor near the MCU.

[0038] The front end of Q3 uses C2 / C4 as filter capacitors to achieve power filtering for the input and the output of the back end.

[0039] The MCU controller is the control core of the entire system. After being connected to other resources through the IO ports, it conducts communication or control.

[0040] C5 is the filter capacitor near the MCU.

[0041] Inside Q1, there are 2 input terminals and 2 output terminals. The 2 input terminals are D input and clock input, and the 2 output terminals are Q output and Q-bar output.

[0042] Q1 will transfer the level state of the D input to the Q output terminal, that is, the level of the Q output terminal is the same as that of the D input terminal.

[0043] When the clock signal is at the falling edge, Q1 will maintain the previous state, and the level of the Q output terminal remains unchanged. When the clock signal is at the rising edge again, Q1 will update the level of the Q output terminal according to the new D input level.

[0044] The Q-bar output terminal of Q1 is the inverted signal of the Q output terminal.

[0045] During operation, inside Q1, there are 2 input terminals (D input and clock input) and 2 output terminals (Q output and Q-bar output). Q1 will transfer the level state of the D input to the Q output terminal, that is, the level of the Q output terminal is the same as that of the D input terminal. When the clock signal is at the falling edge, Q1 will maintain the previous state, that is, the level of the Q output terminal remains unchanged. When the clock signal is at the rising edge again, Q1 will update the level of the Q output terminal according to the new D input level. The Q-bar output terminal of Q1 is the inverted signal of the Q output terminal;

[0046] According to Figure 3 Build a D-type flip-flop application circuit based on the flip-flop truth table;

[0047] At the moment of power-on, the C3 capacitor conducts, the S pin is at high level (H), the R pin is at low level (L), the entire flip-flop is reset and the Q pin outputs high level, Q3 does not conduct, and PWR is not powered on. After the power-on steady state, the C3 capacitor is cut off, the S pin is at low level (L), the R pin is at low level (L), and the entire system is in a stable state, waiting for a rising edge signal at the CLK pin. When the S1 button is pressed, through the voltage division of R1 and R2, a high-level signal from low to high is given to the CLK pin. C1 can filter out the interference of short-time clutter and avoid interfering with the response of Q1. Therefore, when Q1 receives the rising edge signal, the state of the output terminal is reversed, Q outputs a low-level L signal, and Q-bar outputs a high-level H signal. The entire flip-flop maintains the steady state. At this time, since the gate G of Q3 is at low level, the source S and the drain D are conducting, and the output terminal PWR is powered on. When the S1 button is pressed for the second time, similarly, through the voltage division of R1 and R2, a high-level signal from low to high is given to the CLK pin. Therefore, when Q1 receives the rising edge signal, the state of the output terminal is reversed, Q outputs high level (H), Q-bar outputs low level (L), and the entire flip-flop maintains the steady state. At this time, since the gate G of Q3 is at high level, the source S and the drain D are cut off, and the output terminal PWR is powered off. By continuously pressing S1, the power-on and power-off of PWR can be realized. The diode D2 conducts unidirectionally, so it plays a role in isolating the reverse input of the MCU level. In the powered-on state, that is, when Q outputs low level and Q-bar outputs high level, since PWR is in a conductive state, the MCU controller can work normally because it is powered on. When the POWER_KEY of the MCU outputs a high pulse, a high pulse signal is given to the CLK pin, and the state of the output terminal is reversed, Q outputs high level (H), Q-bar outputs low level (L), and the entire flip-flop maintains the steady state. At this time, since the gate G of Q3 is at high level, the source S and the drain D are cut off, and the output terminal PWR is powered off, that is, the entire system is powered off;

[0048] As Figure 3 shown: H = high level; L = low level; X = high impedance state or not considered; ↑ = clock rising edge.

[0049] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A circuit with a low-power on-off function, characterized in that, Including: VCC, which is the input system power supply and is connected to the power input terminal; PWR, which is the output controlled power supply and is connected to the controlled terminal; R6 and D1 represent the load output terminal or the power-on indication circuit of the power supply. Here, it is a simplified load circuit design; S1 is a non-locking tactile button or tactile switch, hereinafter referred to as the button; Q1 is a D-type flip-flop, and the operating current of the chip is 1 - 2 μA; Q3 is a power-type PMOS transistor. Without considering the power of the front-end input power supply, the power of the entire back-end output circuit can be achieved by selecting Q3 with different powers; The MCU controller is the control core of the entire system. After being connected to other resources through the IO port, it conducts communication or control; C5 is a filter capacitor near the MCU.

2. The circuit of the low-power on-off function according to claim 1, characterized in that The front end of Q3 uses C2 / C4 as filter capacitors to achieve power filtering of the input and back-end output; The MCU controller is the control core of the entire system. After being connected to other resources through the IO port, it conducts communication or control; The C5 is a filter capacitor near the MCU.

3. The circuit with a low-power on-off function according to claim 1, wherein The D-type flip-flop is internally composed of 2 input terminals and 2 output terminals. The 2 input terminals are the D input and the clock input, and the 2 output terminals are the Q output and the Q-bar output.

4. The circuit for the low-power on / off function according to claim 3, wherein The Q-bar output terminal of the D-type flip-flop is the inverted signal of the Q output terminal.

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