Electronic equipment and multi-key circuit for reducing standby power consumption thereof

Abstract

The utility model discloses an electronic device and a multi-button circuit for reducing standby power consumption thereof, the multi-button circuit comprises a power supply, a button module, a detection circuit, a first switch, a second switch and a controller, the button module is connected with the power supply to form a loop; the key module at least comprises two keys and two resistors, and when different keys are switched on, the key module is connected with different resistors so as to form different resistance values; the detection circuit is used for detecting a signal of the key module and outputting the signal to the controller; the first switch is connected with a power supply through at least two divider resistors to form a loop; the second switch is connected between the power supply and the controller, and the control end of the second switch is connected between the divider resistors; the controller outputs a control signal to the first switch. According to the multi-key circuit, the first switch and the second switch can be switched off during standby, so that the controller is powered off to reduce power consumption, the key module only occupies one IO port of the controller, the use number of the IO ports is reduced, and connecting lines are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of key circuits, and specifically relates to an electronic device and a multi-key circuit for reducing standby power consumption. Background Art

[0002] An electronic device is generally provided with a key module to identify the functions desired by the user through the key module.

[0003] The key module is arranged on the circuit board, and the controller and the power supply are also arranged on the circuit board. When the electronic device is working, all the devices on the circuit board are in the working or standby state. When the electronic device is not working and all the devices on the circuit board are in the standby state, electric energy is consumed.

[0004] In addition, in a multi-key circuit, each key needs to be provided with an IO port to be connected to the controller so that the controller can receive the control signals of each key, occupying a large number of IO ports of the controller and having many connection lines.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of this application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0006] The utility model provides an electronic device and a multi-key circuit for reducing standby power consumption to solve the technical problems of the existing multi-key circuit having standby power consumption, occupying a large number of IO ports of the controller, and having many connection lines.

[0007] To achieve the above utility model / design purpose, the utility model adopts the following technical solutions to be realized:

[0008] A multi-key circuit for reducing standby power consumption, the circuit comprising:

[0009] A power supply;

[0010] A key module, the key module is connected to the power supply to form a loop; the key module includes at least two keys and two resistors, and different resistors are connected when different keys are turned on, thereby forming different resistance values;

[0011] A detection circuit for detecting the signal of the key module and outputting it to the controller;

[0012] A first switch, connected to the power supply through at least two voltage-dividing resistors to form a loop;

[0013] A second switch, connected between the power supply and the controller, and the control end of the second switch is connected between the voltage-dividing resistors;

[0014] A controller that outputs a control signal to the first switch.

[0015] The multi-button circuit for reducing standby power consumption as described above, wherein the button module includes a plurality of parallel button branches, and each button branch includes a button and a resistor connected in series.

[0016] The multi-button circuit for reducing standby power consumption as described above, wherein the button module includes a plurality of series-connected button branches, and each button branch includes a button and a resistor connected in parallel.

[0017] The multi-button circuit for reducing standby power consumption as described above, wherein the button module is connected to the power supply through a main switch button to form a loop.

[0018] The multi-button circuit for reducing standby power consumption as described above, wherein the circuit includes a DC-DC circuit, the second switch is connected between the power supply and the DC-DC circuit, and the output of the DC-DC circuit supplies power to the controller.

[0019] The multi-button circuit for reducing standby power consumption as described above, wherein the detection circuit includes a detection resistor and a second diode, the detection resistor is connected to a positive voltage, the detection resistor is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the button module.

[0020] The multi-button circuit for reducing standby power consumption as described above, wherein the control end of the second switch is connected to a voltage-dividing resistor and is connected to the button module through a first diode, the positive electrode of the first diode is connected to the voltage-dividing resistor, and the negative electrode of the first diode is connected to the button module.

[0021] The multi-button circuit for reducing standby power consumption as described above, wherein the detection resistor is connected with a filter capacitor.

[0022] The multi-button circuit for reducing standby power consumption as described above, wherein the first switch and the second switch are transistors.

[0023] An electronic device, which includes the multi-button circuit for reducing standby power consumption as described above.

[0024] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0025] The multi-button circuit for reducing standby power consumption of the present utility model includes a power supply, a button module, a detection circuit, a first switch, a second switch and a controller. The button module is connected to the power supply to form a loop. The button module includes at least two buttons and two resistors. Different resistors are connected when different buttons are turned on, so that different resistances are formed. The detection circuit is used to detect the signal of the button module and output it to the controller. The first switch is connected to the power supply through at least two voltage-dividing resistors to form a loop. The second switch is connected between the power supply and the controller, and the control end of the second switch is connected between the voltage-dividing resistors. The controller outputs a control signal to the first switch. When a button in the button module is pressed, the second switch is turned on, the power supply supplies power to the controller, the controller outputs a high-level signal to control the first switch to be turned on, then the second switch remains turned on, the controller outputs a low-level signal to control the first switch to be turned off, then the first switch is turned off, the second switch is turned off, and the controller is powered off. Therefore, the multi-button circuit for reducing standby power consumption of the present utility model can achieve the effect of turning off the first switch and the second switch during standby to power off the controller and reduce power consumption. At the same time, multiple buttons form the button module, which only occupies one IO port of the controller, reducing the number of used IO ports and reducing the connection lines.

[0026] The electronic device of the present utility model includes a multi-button circuit for reducing standby power consumption. The multi-button circuit for reducing standby power consumption includes a power supply, a button module, a detection circuit, a first switch, a second switch and a controller. The button module is connected to the power supply to form a loop. The button module includes at least two buttons and two resistors. Different resistors are connected when different buttons are turned on, so that different resistances are formed. The detection circuit is used to detect the signal of the button module and output it to the controller. The first switch is connected to the power supply through at least two voltage-dividing resistors to form a loop. The second switch is connected between the power supply and the controller, and the control end of the second switch is connected between the voltage-dividing resistors. The controller outputs a control signal to the first switch. When a button in the button module is pressed, the second switch is turned on, the power supply supplies power to the controller, the controller outputs a high-level signal to control the first switch to be turned on, then the second switch remains turned on, the controller outputs a low-level signal to control the first switch to be turned off, then the first switch is turned off, the second switch is turned off, and the controller is powered off. Therefore, the electronic device of the present utility model can achieve the effect of turning off the first switch and the second switch during standby to power off the controller and reduce power consumption. At the same time, multiple buttons form the button module, which only occupies one IO port of the controller, reducing the number of used IO ports and reducing the connection lines.

[0027] After reading the specific implementation manners of the present utility model in conjunction with the accompanying drawings, other features and advantages of the present utility model will become clearer. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0029] Figure 1 is the principle block diagram of a specific embodiment of the present utility model.

[0030] Figure 2 is the circuit diagram of a specific embodiment of the present utility model.

[0031] Figure 3 is the circuit diagram of another specific embodiment of the present utility model.

[0032] Figure 4 is the circuit diagram of yet another specific embodiment of the present utility model. Detailed Embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0037] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] With the increasing shortage of world energy, energy conservation has become an important issue in the world today. For electronic devices, how to reduce power consumption to save energy is an important research direction at present. In order to respond to user needs in a timely manner, electronic devices often have a standby state, and there is also power consumption in the standby state. Therefore, how to reduce standby power consumption has also become an urgent problem to be solved.

[0039] For an electronic device with a multi-button circuit that can respond to various user needs, how to simplify the circuit structure of the multi-button circuit and reduce standby power consumption are the technical problems that need to be solved by the multi-button circuit for reducing standby power consumption.

[0040] The multi-button circuit for reducing standby power consumption includes a power supply, a button module, a detection circuit, a first switch, a second switch, and a controller. The button module is connected to the power supply to form a loop; the button module includes at least two buttons and two resistors. When different buttons are turned on, the button module accesses different resistors to form different resistance values; the detection circuit is used to detect the signal of the button module and output it to the controller; the first switch is connected to the power supply through at least two voltage-dividing resistors to form a loop; the second switch is connected between the power supply and the controller, and the control end of the second switch is connected between the voltage-dividing resistors; the controller outputs a control signal to the first switch. When a button in the button module is pressed, the second switch is turned on, and the power supply supplies power to the controller. The controller outputs a high-level signal to control the first switch to turn on, then the second switch remains turned on. At this time, even if the button is turned off, it does not affect the power supply of the controller. When the controller finishes working and needs to standby, the controller outputs a low-level signal to control the first switch to turn off, then the first switch turns off, the second switch turns off, and the controller is powered off. Therefore, the multi-button circuit for reducing standby power consumption can achieve the effect of turning off the first switch and the second switch during standby to cut off the power supply of the controller to reduce power consumption. At the same time, multiple buttons form the button module, which only occupies one IO port of the controller, reducing the number of IO ports used and reducing the connection lines.

[0041] In Figure 1 the example of, a multi-button circuit for reducing standby power consumption includes a power supply, a button module, a detection circuit, a first switch, a second switch, and a controller.

[0042] The power supply is a DC power supply.

[0043] In some embodiments, the power supply is a storage battery.

[0044] In some embodiments, the power supply is a DC power supply converted from an AC power supply through a rectification circuit.

[0045] The key module is connected to the power supply to form a circuit.

[0046] The detection circuit is used to detect the signal of the key module and output it to the controller.

[0047] When the key is not pressed and in the off state and when the key is pressed and in the on state, the signals detected by the detection circuit are different. The controller can determine whether the key is pressed according to the detection signal received from the detection circuit.

[0048] Among them, the key module includes at least two keys and two resistors. When different keys are turned on, different resistors are connected to the key module to form different resistance values to identify the turned-on key.

[0049] In some embodiments, the key module includes several parallel key branches, and each key branch includes a series-connected key and resistor.

[0050] In some embodiments, the key module includes several series-connected key branches, and each key branch includes a parallel-connected key and resistor.

[0051] In some embodiments, the key module is connected to the power supply through a main switch key to form a circuit.

[0052] The first switch is connected to the power supply through at least two voltage-dividing resistors to form a circuit.

[0053] The second switch is connected between the power supply and the controller, and the control end of the second switch is connected between the voltage-dividing resistors.

[0054] The controller outputs a control signal to the first switch.

[0055] Specifically, the controller outputs a high-level signal or a low-level signal to the first switch.

[0056] When any key is pressed, the power supply, the voltage-dividing resistors, and the key module form a circuit. The voltage at the voltage-dividing resistors drives the second switch to turn on, and the power supply supplies power to the controller. After the controller is powered on, it outputs a high-level signal to the first switch to turn on the first switch. The power supply, the voltage-dividing resistors, and the first switch form a circuit to maintain the second switch in the on state and supply power to the controller. When the controller needs to shut down and enter the low-power mode, the controller outputs a low-level signal, the first switch disconnects, the second switch disconnects, and the power supply stops supplying power to the controller.

[0057] The circuit includes a DC-to-DC circuit. A second switch is connected between the power supply and the DC-to-DC circuit, and the output of the DC-to-DC circuit supplies power to the controller. The DC-to-DC circuit converts the power supply voltage into the operating voltage of the controller.

[0058] The detection circuit includes a detection resistor and a second diode. The detection resistor is connected to the positive voltage and is connected to the output of the DC-to-DC circuit. The detection resistor is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the key module.

[0059] The control terminal of the second switch is connected to a voltage-dividing resistor and is connected to the key module through a first diode. The positive electrode of the first diode is connected to the voltage-dividing resistor, and the negative electrode of the first diode is connected to the key module.

[0060] The detection resistor is connected with a filter capacitor to filter out interference.

[0061] Wherein, the first switch and the second switch are transistors.

[0062] In Figure 2 the example of

[0063] The power supply is a DC power supply.

[0064] The key module is connected to the power supply to form a loop.

[0065] The key module includes three parallel key branches: a first key branch, a second key branch, and a third key branch. Among them, the first key branch includes a series-connected key K1 and resistor R1, the second key branch includes a series-connected key K2 and resistor R2, and the third key branch includes a series-connected key K3 and resistor R3.

[0066] The parallel-connected first key branch, second key branch, and third key branch are connected in series with voltage-dividing resistors R7 and R6 and then connected to both ends of the power supply to form a loop.

[0067] A first diode D1 is provided between the voltage-dividing resistor R7 and the resistors R1, R2, and R3. The positive electrode of the first diode D1 is connected to the resistor R7, and the negative electrode of the first diode D1 is connected to the resistors R1, R2, and R3.

[0068] The keys K1, K2, and K3 are all connected to Vss.

[0069] When different keys are turned on, the key module accesses different resistors to form different resistance values to identify the turned-on key.

[0070] The circuit includes a DC-to-DC circuit (DC TO DC). The DC-to-DC circuit converts the power supply voltage into the operating voltage Vdd of the controller.

[0071] The detection circuit is used to detect the signal of the key module and output it to the controller.

[0072] The detection circuit includes detection resistors R4, R5 and a second diode D2. The detection resistors R4, R5 are connected to the positive voltage. Specifically, they are connected to the output Vss of the DC-DC circuit. The detection resistors R4, R5 are connected to the positive electrode of the second diode D2, and the negative electrode of the second diode D2 is connected to the negative electrodes of the resistors R1, R2, R3 and the first diode D1 of the key module.

[0073] Between the detection resistors R4, R5, Vss is connected through a filter capacitor C1, and the other end of the detection resistor R5 is connected to Vss through a filter capacitor C2 to filter out interference. The other end of the detection resistor R5 is connected to the ADCkey port of the controller.

[0074] The first switch Q1 forms a loop with the power supply through two voltage-dividing resistors R6, R7. The first switch Q1 is in a parallel relationship with the key module.

[0075] The second switch Q2 is connected between the power supply and the controller. Specifically, the second switch A2 is connected between the power supply and the DC-DC circuit, and the control end of the second switch Q2 is connected between the voltage-dividing resistors R6, R7.

[0076] When the key is not pressed and in the off state and when the key is pressed and in the on state, the signals detected by the detection circuit are different. The controller can determine whether the key is pressed according to the detection signal received from the detection circuit.

[0077] The controller MCU outputs a control signal to the first switch Q1.

[0078] Specifically, the controller outputs a high-level signal or a low-level signal to the first switch Q1.

[0079] When any key is pressed, a loop is formed by the power supply, the voltage-dividing resistors R6, R7, and the key module. The voltage between the voltage-dividing resistors R6, R7 drives the second switch Q2 to conduct, and the power supply supplies power to the controller MCU. After the controller MCU is powered on, it outputs a high-level signal to the first switch Q1 to make the first switch Q1 conduct, and a loop is formed by the power supply, the voltage-dividing resistors R6, R7, and the first switch Q1 to maintain the conduction of the second switch Q2 and supply power to the controller MCU. When the controller MCU needs to shut down and enter the low-power mode, the controller MCU outputs a low-level signal, the first switch Q1 is turned off, the second switch Q2 is turned off, and the power supply stops supplying power to the controller MCU.

[0080] Among them, the first switch Q1 and the second switch Q2 are transistors.

[0081] The power-on, power-off cut-off, and holding processes of the multi-key circuit are as follows:

[0082] When any key (such as K1) is pressed, the current forms a loop through R6, R7, D1, R1, and K1. A voltage difference is formed across R6 to drive Q2 to conduct. At this time, POWER supplies power to the MCU through DC TO DC.

[0083] After the MCU is powered on, PWR_lock is set to high level to make Q1 conduct. At this time, through the loop formed by R6, R7, and Q1, Q2 is maintained to conduct to provide power supply to the POWER terminal.

[0084] When the MCU needs to shut down and enter the low-power mode, PWR_lock is set to low level to disconnect the e and c poles of Q1. As a result, there is no voltage difference across R6, causing Q2 to turn off, cutting off the power supply at the POWER terminal and stopping the power supply.

[0085] The key detection process is as follows:

[0086] After the MCU is powered on, ADC_key detects the V_key voltage at the C1 terminal through R5 to identify the key press situation.

[0087] The key recognition process is as follows:

[0088] When no key is pressed, the V_key voltage is equal to Vdd. If the voltage detected by ADC_key is equal to Vdd, it can be judged that no key is pressed;

[0089] When the K1 key is pressed, the V_key voltage is equal to (Vdd - Vd2) * R1 / (R1 + R4) + Vd2. If the voltage detected by ADC_key is equal to (Vdd - Vd2) * R1 / (R1 + R4) + Vd2, it can be judged that the K1 key is pressed;

[0090] When the K2 key is pressed, the V_key voltage is equal to (Vdd - Vd2) * R2 / (R2 + R4) + Vd2. If the voltage detected by ADC_key is equal to (Vdd - Vd2) * R2 / (R2 + R4) + Vd2, it can be judged that the K2 key is pressed;

[0091] When the K3 key is pressed, the V_key voltage is equal to (Vdd - Vd2) * R3 / (R3 + R4) + Vd2. If the voltage detected by ADC_key is equal to (Vdd - Vd2) * R3 / (R3 + R4) + Vd2, it can be judged that the K3 key is pressed.

[0092] The combined key recognition process is as follows:

[0093] If R4 = R, R1 = x * R, R2 = y * R, R3 = z * R:

[0094] When the ADC_key detects that the voltage of V_key is equal to (Vdd - Vd2)*(R1*R2 / (R1 + R2)) / ((R1*R2 / (R1 + R2)) + R4) + Vd2, that is, (Vdd - Vd2)*x*y / (x*y + x + y) + Vd2, it can be determined that the K1 and K2 buttons are pressed simultaneously;

[0095] When the ADC_key detects that the voltage of V_key is equal to (Vdd - Vd2)*(R1*R3 / (R1 + R3)) / ((R1*R3 / (R1 + R3)) + R4) + Vd2, that is, (Vdd - Vd2)*x*z / (x*z + x + z) + Vd2, it can be determined that the K1 and K3 buttons are pressed simultaneously;

[0096] When the ADC_key detects that the voltage of V_key is equal to (Vdd - Vd2)*(R2*R3 / (R2 + R3)) / ((R2*R3 / (R2 + R3)) + R4) + Vd2, that is, (Vdd - Vd2)*y*z / (y*z + y + z) + Vd2, it can be determined that the K2 and K3 buttons are pressed simultaneously;

[0097] When the ADC_key detects that the voltage of V_key is equal to (Vdd - Vd2)*(R1*R2*R3 / (R1*R2 + R2*R3 + R1*R3)) / ((R1*R2*R3 / (R1*R2 + R2*R3 + R1*R3)) + R4) + Vd2, that is, (Vdd - Vd2)*x*y*z / (x*y*z + x*y + y*z + x*z) + Vd2, it can be determined that the K1, K2, and K3 buttons are pressed simultaneously.

[0098] Among them, Vd2 is the voltage of the second diode D2.

[0099] In Figure 3 the example of, on the basis of Figure 2 more buttons are arranged in the way of the first button branch, the second button branch, and the third button branch: the first button branch, the second button branch,..., the nth button branch, and the nth button branch includes a resistor Rn and a button Kn.

[0100] In Figure 4 the example of, the button module includes n series-connected button branches, and each button branch includes a parallel-connected button and a resistor.

[0101] The first button branch includes a parallel-connected first button K1 and a first resistor R1; the second button branch includes a parallel-connected second button K2 and a second resistor R2; the third button branch includes a parallel-connected third button K3 and a third resistor R3,..., and the nth button branch includes a parallel-connected nth button Kn and an nth resistor Rn.

[0102] The Konoff button serves as the power-on switch button, and K1 - Kn serve as the function buttons after power-on.

[0103] This embodiment also proposes an electronic device, which includes the multi-button circuit for reducing standby power consumption described above.

[0104] The electronic device can be, for example, a vacuum cleaner, a hair dryer, a floor cleaning robot, etc., but is not limited thereto.

[0105] The circuit structure of the multi-button circuit of the electronic device is simple, and at the same time, it can reduce standby power consumption.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. A multi-button circuit for reducing standby power consumption, characterized in that: The circuit comprises: power supply; A key module, the key module is connected to the power supply to form a loop; the key module includes at least two keys and two resistors, and when different keys are turned on, the key module is connected to different resistors to form different resistance values; A detection circuit, the detection circuit is used to detect the signal of the key module and output it to the controller; A first switch, connected to the power supply via at least two voltage-dividing resistors to form a loop; A second switch connected between the power supply and the controller, wherein a control end of the second switch is connected between the voltage dividing resistors; The controller outputs a control signal to the first switch.

2. The multi-button circuit for reducing standby power consumption according to claim 1, characterized in that: The key module includes a plurality of key branches connected in parallel, and each key branch includes a key and a resistor connected in series.

3. The multi-key circuit for reducing standby power consumption according to claim 1, characterized in that: The key module includes a plurality of key branches connected in series, and each key branch includes a key and a resistor connected in parallel.

4. The multi-key circuit for reducing standby power consumption according to claim 1, characterized in that: The button module is connected to the power supply via a main switch button to form a loop.

5. The multi-key circuit for reducing standby power consumption according to claim 1, characterized in that: The circuit includes a DC-to-DC circuit, the second switch is connected between the power supply and the DC-to-DC circuit, and the output of the DC-to-DC circuit supplies power to the controller.

6. The multi-key circuit for reducing standby power consumption according to claim 1, characterized in that: The detection circuit includes a detection resistor and a second diode, the detection resistor is connected to a positive voltage, the detection resistor is connected to the anode of the second diode, and the cathode of the second diode is connected to the key module.

7. The multi-key circuit for reducing standby power consumption according to claim 6, characterized in that: The control end of the second switch is connected to a voltage-dividing resistor and is connected to the key module via a first diode, the anode of the first diode is connected to the voltage-dividing resistor, and the cathode of the first diode is connected to the key module.

8. The multi-key circuit for reducing standby power consumption according to claim 6, characterized in that: The detection resistor is connected with a filter capacitor.

9. The multi-key circuit for reducing standby power consumption according to claim 1, characterized in that: The first switch and the second switch are transistors.

10. An electronic device, characterized in that: The electronic device comprises the multi-key circuit for reducing standby power consumption as claimed in any one of claims 1 to 9.

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