TWI533116B - Power saving circuit - Google Patents

Description

Power saving circuit

The invention relates to a power saving circuit, and more particularly to a power saving circuit and an electronic device thereof for reducing power consumption through a pressure sensing function.

With the advent of the Internet of Things era, companies have introduced many types of wearable devices or handheld devices, which use various functions to enhance the user's daily experience, making the number of these terminal electronic devices fast and global. increase.

Most of these networked terminal electronic devices use batteries as power for the sake of portability. Therefore, as the number of portable devices of users increases, the demand for charging each terminal electronic device may cause user confusion, so how to Extending the standby time of the terminal electronic device to provide a better user experience for the user has become an important consideration for the company during product development. In particular, the user has begun to notice this problem, making the terminal electronic device with longer standby time. Devices are more popular on the market.

In the state where the general terminal electronic device is turned off, since the switch unit is not turned on, when the switch is open, the electronic device circuit is judged to enter the sleep mode, so that the electronic device circuit is standby in the power state with the least consumption, and the on-current is to be switched. The rear electronic device circuit enters the working state after the control.

However, the electronic device circuit of a general terminal electronic device still consumes a small amount of power in a sleep state, so in order to make the terminal electronic device have a longer standby time, it is necessary A power saving circuit that does not consume power when the electronic device circuit is turned off is proposed.

For example, in a known Bluetooth stylus, the Bluetooth stylus has a power button. When the user turns on the power button, the electronic device circuit of the Bluetooth stylus enters the working state from the sleep mode. Since the Bluetooth stylus is a low-power product, if you can save the power consumed by the sleep mode, you will be able to greatly increase the usage time and standby time.

SUMMARY OF THE INVENTION The object of the present invention is to provide a power saving circuit for the above-mentioned deficiencies, in order to prevent the electronic device circuit from consuming power in a shutdown state.

To achieve the above object, the present invention discloses a power saving circuit, which is connected to a power supply, and includes a variable resistor, a switch and a processing module. The power source is respectively connected to the switch and the variable resistor, and the processing module is respectively connected to the switch. And a variable resistor, the switch is connected to the variable resistor. The switch is arranged to turn on the line between the power supply and the processing module when the variable resistor is subjected to pressure. The processing module is configured to provide a switch-operating signal upon receipt of the power source to cause the switch to continuously conduct power to the circuit between the processing modules when the variable resistor is not under pressure. Alternatively, the processing module is configured to detect the voltage of the variable resistor to turn off the working signal, and the switch disconnects the line from the power supply to the processing module.

The variable resistor can be a pressure sensor.

The variable resistor includes a first end and a second end. The switch includes a PMOS transistor and an NMOS transistor. The processing module includes a power pin, a signal pin for transmitting a working signal, and a detecting variable resistor. The voltage of the voltage, the positive pole of the power supply is respectively connected to the source of the PMOS transistor and the first end of the variable resistor, the second end is connected to the gate of the NMOS transistor, and the line between the second end and the gate of the NMOS transistor After a resistor is grounded, the line between the second end and the gate of the NMOS transistor Connected to the voltage pin, the source of the NMOS transistor is grounded, the drain of the NMOS transistor is connected to the gate of the PMOS transistor, the drain of the PMOS transistor is connected to the power supply pin, and the anode of the power supply is connected to the source of the PMOS transistor. The line is connected to the signal pin via a resistor forming a node between the gate of the PMOS transistor and the drain of the NMOS transistor.

The circuit between the second end and the gate of the NMOS transistor is connected in series with a reverse loop amplifier and connected to the voltage pin.

An electronic device includes a housing having a predetermined touch area. A power saving circuit of the invention is located within the housing. And an electronic device circuit powered by the power saving circuit is disposed in the housing. The variable resistor is configured to be sensed when the user touches the preset touch area, and the electronic device circuit controls the electronic device according to the variable resistance voltage detected by the power saving circuit.

The electronic device further includes a wireless module that connects the electronic device circuits.

The electronic device is a stylus, the housing is a pen, and the variable resistor is connected to the stylus tip of one end of the pen.

The electronic device further includes a wireless module that connects the electronic device circuits.

The power saving circuit of the present invention has the following advantages:

1. The power saving circuit of the present invention increases the standby time of the electronic device.

2. The power-saving circuit of the present invention allows the variable resistor to be used as a switch for an electronic device in addition to sensing pressure, thereby freeing the switch from the electronic device and thereby saving manufacturing time and expense.

3. When the power saving circuit of the present invention is applied to a stylus, the stylus is used and Generally, the writing pen is as intuitive as it is, and it does not need to have another action to turn on the power, so as to enhance the user's daily experience.

Fourth, since the electronic device of the present invention and the outer surface of the stylus do not need to be provided with switches, the design can be made more unrestricted.

1‧‧‧Power saving circuit

10‧‧‧Variable resistor

100‧‧‧ first end

101‧‧‧ second end

102‧‧‧Reverse loop amplifier

11‧‧‧Electronic device circuit

12‧‧‧Power supply

13‧‧‧ switch

130‧‧‧PMOS transistor

131‧‧‧NMOS transistor

14‧‧‧Processing module

140‧‧‧Power foot

141‧‧‧ signal foot

142‧‧‧ voltage foot

2‧‧‧Electronic equipment

20‧‧‧shell

21‧‧‧Preset touch zone

3‧‧‧ stylus

30‧‧‧ pen

31‧‧‧Touch tip

32‧‧‧Wireless Module

G‧‧‧ gate

S‧‧‧ source

D‧‧‧汲

R‧‧‧resistance

The first figure is a block diagram of the power saving circuit of the present invention.

The second figure is a circuit diagram of the power saving circuit of the present invention.

The third figure is a block diagram of an electronic device with a power saving circuit of the present invention.

The fourth figure is a schematic view of a stylus according to the present invention.

The fifth figure is a schematic diagram of the use of the stylus and the electronic device in the fourth figure.

In order to explain the technical content, structural features, objectives and effects of the present invention in detail, the following detailed description is given by way of example.

Referring to the first figure, the present invention discloses a power saving circuit 1 for saving power consumed by a terminal electronic device during standby. The power saving circuit 1 is connected between a power source 12 and an electronic device circuit 11.

The power saving circuit 1 includes a variable resistor 10, a switch 13, and a processing module 14. The power source 12 is connected to the switch 13 and the variable resistor 10, respectively. The processing module 14 is connected to the switch 13, the variable resistor 10 and the electronic device circuit 11, respectively, and the switch 13 is connected to the variable resistor 10.

The switch 13 in the embodiment is arranged to turn on the line between the power source 12 and the processing module 14 when the variable resistor 10 is subjected to pressure.

The processing module 14 is configured to transmit the power source 12 to the electronic device circuit 11, Detecting the signal of the variable resistor 10 and maintaining the power supply of the switch 13, and is configured to provide a switch 13 after the power source 12 is received, so that the switch 13 continuously turns on the power source 12 to the processing module when the variable resistor 10 is not under pressure. The line 14 of the processing module 14 is also arranged to detect the voltage of the variable resistor 10, and when the processing module 14 turns off the working signal, the switch 13 opens the line of the power source 12 to the processing module 14.

In an embodiment, the variable resistor 10 can be a pressure sensor.

Please refer to the second figure, which is an embodiment of a power saving circuit 1. The variable resistor 10 has a very large resistance (generally regarded as infinite) when it is not subjected to pressure, and the variable resistor 10 includes a first end 100 and a second end 101. The switch 13 includes a PMOS transistor 130 (P-type Metal-Oxide-Semiconductor Field-Effect Transistor, PMOS FET) and an NMOS transistor 131 (N-type). The processing module 14 includes a power supply pin 140 for receiving current, a signal pin 141 for transmitting a working signal, and a voltage pin 142 for detecting the voltage of the variable resistor 10.

The positive poles of the power source 12 are respectively connected to the source S of the PMOS transistor 130 and the first end 100 of the variable resistor 10. The second end 101 of the variable resistor 10 is connected to the gate G of the NMOS transistor 131, and the second terminal 101 and the NMOS are connected. The line between the gates G of the transistor 131 is grounded via a resistor R, and the line between the second terminal 101 and the gate G of the NMOS transistor 131 is also connected to the voltage pin 142, the source S of the NMOS transistor 131. Grounding, the drain D of the NMOS transistor 131 is connected to the gate G of the PMOS transistor 130, the drain D of the PMOS transistor 130 is connected to the power supply pin 140, and the positive terminal of the power supply 12 is connected to the PM. The line between the source S of the OS transistor 130 is connected to the signal pin 141 via a resistor R and a line forming node between the gate G of the PMOS transistor 130 and the drain D of the NMOS transistor 131.

The circuit between the second end 101 of the variable resistor 10 and the gate G of the NMOS transistor 131 is connected in series with a reverse loop amplifier 102 and then connected to the voltage pin 142. When the voltage enters the reverse loop amplifier 102, the voltage value is processed, causing the voltage change to form a linear undulation that is easier to interpret.

The current circulation mode of the power saving circuit 1 of the present embodiment is such that after the variable resistor 10 is subjected to pressure, the resistance inside the variable resistor 10 starts to decrease due to the pressure change, and then the NMOS transistor is caused by the circuit partial pressure theorem. The gate G of the 131 is subjected to a voltage, and the drain D of the NMOS transistor 131 is turned on and the source S is turned on. Since the source S of the NMOS transistor 131 is grounded, the gate G of the PMOS transistor 130 is lowered and the PMOS is turned on. The drain D and the source S of the crystal 130 cause the power supply pin 140 to receive power.

The voltage at the second terminal 101 of the variable resistor 10 can be received by the voltage pin 142 of the processing module 14. The processing module 14 controls the signal pin 141 to emit a low level voltage so that the gate G of the PMOS transistor 130 is at a low level, thereby keeping the drain D and the source S of the PMOS transistor 130 conductive (the first variable at this time) The resistor 10 can receive power even if the resistor 10 is under pressure.

Although the variable resistor 10 is not subjected to pressure, the resistance of the variable resistor 10 changes back to infinity, and the line of the variable resistor 10 to the voltage pin 142 of the processing module 14 is an open circuit and the drain D and the source of the NMOS transistor 131. The pole S is not conducting, but the gate G of the PMOS transistor 130 is provided by the signal pin 141 to provide a low level of shadow. According to the characteristics of the PMOS transistor 130, the drain D and the source S of the PMOS transistor 130 are continuously turned on, so that the power pin 140 is turned on. Therefore, when the current is turned on, the power source 12 is turned off by the processing module 14.

When the electronic device circuit 11 needs to turn off the power, the processing module 14 only needs to control the signal pin 141 to emit a high level voltage. According to the characteristics of the PMOS transistor 130, the gate G of the PMOS transistor 130 is affected by the high level voltage of the signal pin 141. The drain D and the source S of the PMOS transistor 130 are non-conducting, and the processing module 14 is disconnected from the power source 12. According to the second figure, the gate G and the source S of the PMOS transistor 130 are turned off in the off state. It is a high standard.

The electronic device circuit 11 can be turned off. If the voltage value detected by the voltage pin 142 continues to be zero after a period of time, the set signal pin 141 is set to a high level voltage to turn off the current source.

Referring to the third figure, the power saving circuit 1 can be applied to an electronic device 2, and the electronic device 2 is housed inside the power saving circuit 1 and the electronic device circuit 11 by a casing 20. The housing 20 of the electronic device 2 has a predetermined touch area 21, and the variable resistor 10 is arranged to be sensed when the user touches the preset touch area 21, and the electronic device circuit 11 can be detected according to the power saving circuit 1. The measured change in the voltage value of the variable resistor 10 in turn controls the electronic device 2.

Further, the preset touch area 21 is a position where the electronic product contacts the body or contacts the object when the electronic product is used.

Referring to the fourth figure, the electronic device 2 can be a stylus 3 including a pen 30, a stylus tip 31 at one end of the pen 30, and a variable resistor 10 connected to the stylus tip 31. The power saving circuit 1 and the electronic device circuit 11 are both Located in the pen holder 30.

As shown in the fifth figure, the stylus tip 31 and the variable resistor 10 are disposed such that when the user touches the stylus tip 31 of the stylus pen 3 to the object, the variable resistor 10 is squeezed, whereby the variable resistor 10 can be The stroke of the inductive stylus 3 can also be used as a switch of the stylus 3.

In order to enable the stylus 3 to be coupled to the electronic device to sense the user's stroke, the stylus includes a wireless module 34 connected to the electronic device circuit 11 for providing the electronic device circuit 11 to communicate with the electronic device.

The power saving circuit 1 of the present invention has the following advantages:

1. The power saving circuit 1 of the present invention increases the standby time of the electronic device 2.

2. The power saving circuit 1 of the present invention allows the variable resistor 10 to be used as a switch for the electronic device 2 in addition to sensing the pressure, thereby eliminating the need for the electronic device 2 to save a manufacturing time and expense.

3. When the power saving circuit 1 of the present invention is applied to the stylus pen 3, the stylus pen 3 is used in the same sense as the general writing pen, and it can be used as needed, and no additional action is required to turn on the power source, thereby improving the daily life of the user. Experience.

Fourth, since the electronic device 2 and the stylus 3 of the present invention do not need to be provided with switches on the outer surface, the design can be made more unrestricted.

In view of the above advantages, it is expected that the electronic device 2 incorporating the power saving circuit 1 of the present invention is popular among consumers in the market, and in order to enable the public to enjoy the benefits brought by this skill, it is hoped that the auditing committee can As soon as possible, the patent application for this case was granted.

1‧‧‧Power saving circuit

10‧‧‧First variable resistor

100‧‧‧ first end

101‧‧‧ second end

102‧‧‧Reverse loop amplifier

12‧‧‧Power supply

13‧‧‧ switch

130‧‧‧PMOS transistor

131‧‧‧NMOS transistor

14‧‧‧Processing module

140‧‧‧Power foot

141‧‧‧ signal foot

142‧‧‧ voltage foot

G‧‧‧ gate

S‧‧‧ source

D‧‧‧汲

R‧‧‧resistance

Claims (3)

A power-saving circuit is connected to a power supply, comprising: a variable resistor, a switch and a processing module, wherein the power source is respectively connected to the switch and the variable resistor, and the processing module is respectively connected to the switch and the variable resistor, and the switch connection is The variable resistor; the switch is configured to turn on the line between the power supply and the processing module when the variable resistor is under pressure; the processing module is configured to provide a switch-operating signal after receiving the power source so that the switch is not under pressure in the variable resistor Continuously turning on the power to the circuit between the processing modules; or, the processing module is configured to detect the voltage value of the variable resistor for a period of time that does not change to zero, to provide a switch-operation signal when the working signal is turned off The circuit is disconnected from the power supply to the processing module; the variable resistor includes a first end and a second end, the switch includes a PMOS transistor and an NMOS transistor, and the processing module includes a power pin and transmits a signal pin of the working signal and a voltage pin for detecting the variable resistance voltage, the positive pole of the power source is respectively connected to the source of the PMOS transistor and the first end of the variable resistor, and the second end is connected The gate of the NMOS transistor, the line between the second end and the gate of the NMOS transistor is grounded through a resistor, and the line between the second end and the gate of the NMOS transistor is connected to the voltage pin, the source of the NMOS transistor The pole is grounded, the drain of the NMOS transistor is connected to the gate of the PMOS transistor, the drain of the PMOS transistor is connected to the power supply pin, and the line between the anode of the power supply and the source of the PMOS transistor passes through a resistor and a gate of the PMOS transistor. The line forming node between the poles of the pole and the NMOS transistor is then connected to the signal pin. The power saving circuit of claim 1, wherein the variable resistor is Pressure sensor. The power saving circuit of claim 1, wherein the circuit between the second end and the gate of the NMOS transistor is connected in series with a reverse loop amplifier and connected to the voltage pin.