TWI475372B - Power manage apparatus and power managing method thereof - Google Patents

Description

Power management device and power management method

The present invention relates to a power management device and a management method, and more particularly to a power management device and a management method suitable for a portable electronic device.

With the advancement of electronic technology, portable electronic devices (such as notebook computers) have become an indispensable tool in people's lives. Further, through the advancement of the network technology, the user of the portable electronic device can operate the portable electronic device without touching the portable electronic device.

For example, the user can wake up the remote computer through the cloud system and operate the notebook. However, since the user cannot know the storage state of the notebook at that time, if the notebook computer that the user wakes up is placed in, for example, an airtight storage bag, the temperature of the notebook computer rises. The speed will be relatively fast. Therefore, in such a state, the possibility of a hot crash of the notebook computer will increase significantly.

The invention provides a power management device and a management method, which can adjust the temperature limit of the portable electronic device according to the state of the portable electronic device.

The invention provides a portable electronic device, wherein the power management device can The temperature limit of the portable electronic device is adjusted in accordance with the state of the portable electronic device.

The invention provides a power management device suitable for a portable electronic device. The power management device includes a display state detector, a resistance provider, a temperature sensor, and a power generator. The display state detector generates a switching signal according to detecting the display state of the screen of the portable electronic device. The resistance provider is coupled to the display state detector. The resistance provider has an output and varies the impedance value provided at its output in accordance with the switching signal. The temperature sensor is coupled to the output of the resistance provider for detecting the ambient temperature. The temperature sensor generates a power enable signal based on the ambient temperature and the magnitude of the impedance value. The power generator is coupled to the temperature sensor to disable or enable the system power generation according to the power enable signal.

In an embodiment of the invention, the temperature sensor sets a temperature threshold according to the magnitude of the impedance value, and the temperature sensor generates a power enable signal according to the comparison of the ambient temperature and the temperature threshold.

In an embodiment of the present invention, when the switching signal indicates that the display state of the screen of the portable electronic device is the normal display state, the temperature sensor sets the temperature threshold equal to the first set value, and the temperature When the switching signal indicates that the display state of the screen of the portable electronic device is off state, the temperature sensor setting temperature threshold value is equal to the second set value, wherein the first set value is greater than the second set value.

In an embodiment of the invention, the resistance provider includes a first resistor, a second resistor, and a switch. The first resistor has a first end and a second end, the first end of which is coupled to the output of the resistance provider. The second resistor has a first end and a second end, the first end of which is coupled to the output end of the resistance provider, and the second The second end of the resistor is coupled to the reference power source. The switch is coupled between the second end of the first resistor and the reference power source, and the control end of the switch receives the switching signal, and the switch is controlled by the switching signal to be turned on or off.

In an embodiment of the invention, the resistor value provider further includes an OR gate. Or the gate is coupled between the switch and the coupling path of the temperature sensor, or the first input of the gate receives the switching signal, or the second input of the gate receives the sleep and sleep enable signal, or the output of the gate is coupled To the control end of the switch.

In an embodiment of the invention, the resistance provider includes a first resistor, a second resistor, and a switch. The first resistor has a first end and a second end, the first end of which is coupled to the reference power source. The second resistor has a first end and a second end, and the first end of the second resistor is coupled to the first end of the first resistor. The switch has a first input end, a second input end and an output end, the first input end of the switch is coupled to the second end of the first resistor, and the second input end of the switch is coupled to the second end of the second resistor, the switch The output is coupled to the temperature sensor. The switch receives and couples the first input end or the second input end to the output end of the switch according to the switching signal, wherein the impedance values of the first resistor and the second resistor are not equal.

In an embodiment of the invention, the resistor value provider further includes an OR gate. Or the gate is coupled between the switch and the coupling path of the temperature sensor, or the first input of the gate receives the switching signal, or the second input of the gate receives the sleep and sleep enable signal, or the output of the gate is coupled To the control end of the switch.

The invention further provides a power management method suitable for a portable electronic device, comprising: firstly, generating a switching signal according to detecting a display state of a screen of the portable electronic device; generating an impedance value according to the switching signal Change the magnitude of the impedance value; detect the ambient temperature, and generate the power enable signal according to the ambient temperature and the magnitude of the impedance value; finally, disable or enable the system power generation according to the power enable signal.

Based on the above, the present invention changes the impedance value provided by the resistance provider according to the display state of the screen of the portable electronic device. By the different impedance values provided by the resistance provider, the temperature sensor can generate a power enable signal according to the ambient temperature under different conditions, so that the power generator can perform thermal shutdown according to different conditions. The action makes the portable electronic device not crash for no reason.

The above described features and advantages of the present invention will be more apparent from the following description.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a portable electronic device 100 according to an embodiment of the present invention. The portable electronic device 100 includes a power management device 110. The power management device 110 includes a display state detector 111, a resistance provider 112, a temperature sensor 113, and a power generator 114. The display state detector 111 is coupled to the resistance provider 112, and the resistance provider 112 is coupled to the temperature sensor 113. In addition, the temperature sensor 113 is coupled to the power generator 114.

The display state detector 111 generates the switching signal SWS according to the display state of the screen of the portable electronic device 100. Taking the portable electronic device 100 as a notebook computer as an example, when the notebook computer is placed in the storage bag, the upper cover is maintained in a closed state. That is, in this state The screen of the portable electronic device 100 does not perform the display function. To be specific, in a notebook computer, a detection mechanism (such as a mechanical button) is usually provided to reflect the state in which the upper cover of the notebook is opened or closed. The display state detector 111 can also generate the switching signal SWS according to the state in which the upper cover of the notebook detected by the detecting mechanism is turned on or closed.

The resistance provider 112 receives the switching signal SWS generated by the display state detector 111. The resistance provider 112 has an output terminal ROT, and the resistance provider 112 changes the impedance value provided at its output terminal ROT according to the switching signal SWS. Taking the switching signal SWS logic signal generated by the display state detector 111 as an example, the resistance provider 112 can provide the first impedance value to the output terminal ROT when the switching signal SWS is a logic high level signal. In contrast, the resistance provider 112 can also provide the second impedance value to the output terminal ROT when the switching signal SWS is a logic low level signal, wherein the first impedance value and the second impedance value are not equal.

The temperature sensor 113 is coupled to the output terminal ROT of the resistance provider 112. The temperature sensor 113 is configured to detect an ambient temperature of the portable electronic device 100. In addition, the temperature sensor 113 generates the power enable signal POWEN according to the detected ambient temperature and the magnitude of the impedance value provided by the resistance provider 112, and transmits the power enable signal POWEN to the power generator 114. .

The power generator 114 receives the power enable signal POWEN. The power generator 114 disables or enables the generation of the system power supply V1 according to the power enable signal POWEN.

Specifically, in the embodiment, the resistance provider 112 provides different impedance values to the output terminal ROT of the resistance provider 112 according to the switching signal SWS, and the temperature sensor 113 can be based on the output ROT. The magnitude of the impedance value determines the size of the set temperature threshold. Moreover, the temperature sensor 113 generates the power enable signal POWEN by comparing the detected ambient temperature and the temperature threshold, and causes the power generator 114 to pass the power enable signal POWEN when the ambient temperature is higher than the temperature threshold. Stop generating system power supply V1. In contrast, when the ambient temperature is not higher than the temperature threshold, the temperature sensor 113 transmits the power enable signal POWEN to enable the power generator 114 to continuously generate the system power V1. Among them, the system power supply V1 is supplied to the portable electronic device 100 as a power source required for its operation.

In an embodiment of the invention, when the switching signal SWS indicates that the display state of the screen of the portable electronic device 100 is the normal display state, the temperature sensor 113 sets the temperature threshold equal to the first set value ( For example, when the switching signal SWS indicates that the display state of the screen of the portable electronic device 100 is off, the temperature sensor 113 sets the temperature threshold equal to the second set value. (for example, 50 degrees Celsius), wherein the first set value is greater than the second set value. That is, when the display state of the screen of the portable electronic device 100 is the normal display state, the power generator 114 cuts off the system power supply V1 in a state where the ambient temperature is high (greater than the first set value). . When the display state of the screen of the portable electronic device 100 is off, the power generator 114 may be in a state where the ambient temperature is low (greater than the second set value). That is, the generation operation of the system power supply V1 is cut off.

Referring to FIG. 2A, FIG. 2A illustrates an embodiment of a resistance provider 112 according to an embodiment of the present invention. In the present embodiment, the resistance provider 112 includes a resistor R1, a resistor R2, and a switch SW1. The first end of the resistor R1 is coupled to the output terminal ROT of the resistance provider 112, and the second end of the resistor R1 is coupled to the switch SW1. The first end of the resistor R2 is coupled to the output terminal ROT of the resistance provider 112, and the second end of the resistor R2 is coupled to the reference power source GND. The switch SW1 is connected in series between the second end of the resistor R1 and the reference power source GND, and the control end of the switch SW1 receives the switching signal SWS, and the switch SW1 is turned on or off according to the switching signal SWS. The switch SW1 is a transistor switch constructed by the transistor M1, and the reference power source GND may be a ground voltage.

In the present embodiment, when the switch SW1 is turned on according to the switching signal SWS, the impedance value provided by the resistance provider 112 on the output terminal ROT is equal to the impedance value of the parallel connection of the resistors R1 and R2. In contrast, when the switch SW1 is turned off according to the switching signal SWS, the resistance value provided by the resistance provider 112 on the output terminal ROT is equal to the impedance value of the resistor R2. That is, when the switch SW1 is turned on according to the switching signal SWS, the resistance value provided by the resistance provider 112 on the output terminal ROT is smaller than when the switch SW1 is turned off according to the switching signal SWS, and the resistance provider 112 is outputting. The impedance value provided on the end ROT.

Referring to FIG. 2B, FIG. 2B illustrates another embodiment of the resistance provider 112 of the embodiment of the present invention. In the present embodiment, the resistance provider 112 includes a resistor R1, a resistor R2, a switch SW1, and an OR gate OR1. Electricity The first end of the resistor R1 is coupled to the output terminal ROT of the resistance provider 112, and the second end of the resistor R1 is coupled to the switch SW1. The first end of the resistor R2 is coupled to the output terminal ROT of the resistance provider 112, and the second end of the resistor R2 is coupled to the reference power source GND. The switch SW1 is connected in series between the second end of the resistor R1 and the reference power source GND, the control end of the switch SW1 is coupled to the output end of the OR gate OR1, and the two input terminals of the OR gate OR1 respectively receive the switching signal SWS and sleep and sleep Can signal SLP.

In the present embodiment, the on and off of the switch SW1 are controlled based on the result of the logical OR operation of the switching signal SWS and the sleep and sleep enable signal SLP. The sleep and sleep enable signal SLP is used to indicate whether the portable electronic device 100 enters a state of sleeping or sleeping. For example, when the portable electronic device 100 enters a sleep or sleep state, the sleep and sleep enable signal SLP is equal to a logic low level. In contrast, when the portable electronic device 100 enters the power on state, sleep and sleep. The enable signal SLP is equal to the logic high level. In addition, when the display state of the screen of the portable electronic device 100 is off, the switching signal SWS is at a logic low level. In contrast, when the display state of the screen of the portable electronic device 100 is normal display, the switching signal SWS is switched. It is a logic low level.

In other words, in the present embodiment, when the portable electronic device 100 enters a sleep or sleep state, and the display state of the screen of the portable electronic device 100 is off, the resistance provider 112 is at its output end. The impedance value provided by the ROT is equal to the impedance value of the resistor R2, while in other cases, the resistance value provided by the resistance provider 112 at its output terminal ROT is equal to the impedance value of the resistors R1 and R2 in parallel.

Referring to FIG. 3A and FIG. 3B, FIG. 3A and FIG. 3B respectively illustrate two other embodiments of the resistance provider 112 according to the embodiment of the present invention. In FIG. 3A, the resistance provider 112 includes a resistor R1, a resistor R2, and a switch SW2. The first end of the resistor R1 is coupled to the reference power source GND, and the first end of the resistor R2 is coupled to the first end of the resistor R1. The switch SW2 has a first input terminal IT1, a second input terminal IT2, and an output terminal OT1. The first input terminal IT1 of the switch SW2 is coupled to the second end of the resistor R1, and the second input terminal IT2 of the switch SW2 is coupled to the second end of the resistor R2. Moreover, the output end OT1 of the switch SW2 is coupled to the temperature sensor 113. The switch SW2 receives and connects the first input terminal IT1 or the second input terminal IT2 to the output terminal OT1 of the switch SW2 according to the switching signal SWS, wherein the impedance value of the resistor R1 is smaller than the impedance value of the resistor R2.

In the embodiment, when the switching signal SWS indicates that the display state of the screen of the portable electronic device 100 is the normal display state, the switch SW2 couples the second input terminal IT2 of the switch SW2 to the output of the switch SW2 according to the switching signal SWS. Terminal OT1 and provides a relatively large impedance value (resistance value of resistor R2) to the output terminal ROT of resistance vector 112. In contrast, when the switching signal SWS indicates that the display state of the screen of the portable electronic device 100 is off, the switch SW2 couples the first input terminal IT1 of the switch SW2 to the output terminal OT1 of the switch SW2 according to the switching signal SWS, and provides A relatively small impedance value (resistance value of the resistor R1) is supplied to the output terminal ROT of the resistance provider 112.

In the embodiment of FIG. 3B, the resistance provider 112 further includes an OR gate OR2. Here, or the coupling mode, function and action mode of the gate OR2 The OR gate OR1 of the embodiment of Fig. 2B is the same, and will not be described here. That is, only when the portable electronic device 100 enters a sleep or sleep state, and the display state of the screen of the portable electronic device 100 is off, the first input terminal IT1 of the switch SW2 is coupled to the output of the switch SW2. Terminal OT1 and provides a relatively small impedance value (impedance value of resistor R1) to the output terminal ROT of resistance vector 112. In other conditions, the second input terminal IT2 of the switch SW2 is coupled to the output terminal OT1 of the switch SW2, and provides a relatively large impedance value (resistance value of the resistor R2) to the output terminal ROT of the resistance provider 112. .

Please refer to FIG. 4, which is a flowchart of a power management method according to an embodiment of the present invention. The power management method of the present embodiment is applicable to a portable electronic device (for example, a notebook computer), and the method includes: in step S410, generating a switching signal according to detecting a display state of a screen of the portable electronic device; In step S420, an impedance value is generated, and the magnitude of the impedance value is changed according to the switching signal; in step S430, the ambient temperature is detected, and the power enable signal is generated according to the ambient temperature and the magnitude of the impedance value; in step S430 In the middle, the power supply signal is used to disable or enable the system power generation action. The details of the operation of the power management method of the present embodiment are described in detail in the foregoing embodiments and embodiments, and are not described in detail below.

In summary, the present invention adjusts the magnitude of the impedance value provided to the temperature sensor by detecting the display state of the screen of the portable electronic device. So that the temperature sensor generates a power enable signal according to the detected ambient temperature and the magnitude of the impedance value, so that the portable electronic device can be in different strips. Perform a thermal shutdown action.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Portable electronic devices

110‧‧‧Power management device

111‧‧‧Display Status Detector

112‧‧‧ resistance provider

113‧‧‧temperature sensor

114‧‧‧Power generator

SWS‧‧‧Switching signal

ROT, OT1‧‧‧ output

POWEN‧‧‧Power enable signal

V1‧‧‧ system power supply

R1, R2‧‧‧ resistance

SW1, SW2‧‧‧ switch

GND‧‧‧reference power supply

OR1, OR2‧‧‧ or gate

SLP‧‧‧sleep and sleep enable signal

IT1, IT2‧‧‧ input

S410~S440‧‧‧Power Management Steps

FIG. 1 is a schematic diagram of a portable electronic device 100 according to an embodiment of the invention.

FIG. 2A illustrates an embodiment of a resistance provider 112 in accordance with an embodiment of the present invention.

FIG. 2B illustrates another embodiment of the resistance provider 112 of the embodiment of the present invention.

3A and 3B illustrate two other embodiments of the resistance provider 112 of the embodiment of the present invention, respectively.

FIG. 4 is a flow chart of a power management method according to an embodiment of the present invention.

100‧‧‧Portable electronic devices

110‧‧‧Power management device

111‧‧‧Display Status Detector

112‧‧‧ resistance provider

113‧‧‧temperature sensor

114‧‧‧Power generator

SWS‧‧‧Switching signal

ROT‧‧‧ output

V1‧‧‧ system power supply

POWEN‧‧‧Power enable signal

Claims (9)

A power management device is applicable to a portable electronic device, comprising: a display state detector, generating a switching signal according to detecting a display state of a screen of the portable electronic device; and a resistance value provider Connected to the display state detector, the resistance provider has an output, and changes an impedance value provided at an output thereof according to the switching signal; a temperature sensor coupled to the output of the resistance provider The end sensor is configured to detect an ambient temperature, and the temperature sensor generates a power enable signal according to the ambient temperature and the magnitude of the impedance value; and a power generator coupled to the temperature sensor, according to the The power enable signal disables or enables a system power generation action, wherein the temperature sensor sets a temperature threshold according to the magnitude of the impedance, and the temperature sensor compares the ambient temperature and The temperature threshold is used to generate the power enable signal. The power management device of claim 1, wherein the temperature sensor sets the temperature when the display signal indicates that the display state of the screen of the portable electronic device is a normal display state. The threshold value is equal to a first set value, and the temperature sensor sets the temperature threshold to be equal to a second setting when the switching signal indicates that the display state of the screen of the portable electronic device is off. a value, wherein the first set value is greater than the second set value. The power management device according to claim 1, wherein The resistance provider includes: a first resistor having a first end and a second end, the first end of which is coupled to the output end of the resistance provider; and a second resistor having a first end and a second end The first end is coupled to the output end of the resistance provider, the second end of the second resistor is coupled to a reference power source, and a switch is coupled to the second end of the first resistor and the reference Between the power sources, the control terminal of the switch receives the switching signal, and the switch is controlled by the switching signal to be turned on or off. The power management device of claim 3, wherein the resistance provider further comprises: an OR gate coupled between the switch and the coupling path of the temperature sensor, the first of the gates The input terminal receives the switching signal, and the second input terminal of the OR gate receives a sleep and sleep enable signal, and the output end of the OR gate is coupled to the control end of the switch. The power management device of claim 1, wherein the resistance provider comprises: a first resistor having a first end and a second end, the first end of which is coupled to a reference power source; a resistor having a first end and a second end, the first end of the second resistor being coupled to the first end of the first resistor; and a switch having a first input, a second input, and an output The first input end of the switch is coupled to the second end of the first resistor, and the second input end of the switch is coupled to the second end of the second resistor, the output of the switch The end is coupled to the temperature sensor, and the switch receives and couples the first input end or the second input end to the output end of the switch according to the switching signal, wherein the first resistor and the second resistor The impedance values are not equal. The power management device of claim 5, wherein the resistance provider further comprises: a gate connected between the switch and the coupling path of the temperature sensor, the first of the gates The input terminal receives the switching signal, and the second input terminal of the OR gate receives a sleep and sleep enable signal, and the output end of the OR gate is coupled to the control end of the switch. A power management method is applicable to a portable electronic device, comprising: generating a switching signal according to detecting a display state of a screen of the portable electronic device; generating an impedance value, and changing the impedance according to the switching signal The magnitude of the value; detecting an ambient temperature, setting a temperature threshold according to the magnitude of the impedance; generating a power enable signal according to comparing the ambient temperature and the temperature threshold; and determining the power enable signal according to the power supply signal To disable or enable the generation of a system power supply. The power management method of claim 7, wherein the step of setting the temperature threshold according to the magnitude of the impedance value comprises: When the switching signal indicates that the display state of the screen of the portable electronic device is a normal display state, setting the temperature threshold to be equal to a first set value; and indicating, in the switching signal, display of the screen of the portable electronic device When the state is off, the temperature threshold is set to be equal to a second set value, wherein the first set value is greater than the second set value. The power management method of claim 8, further comprising: receiving a sleep and sleep enable signal; and changing the magnitude of the impedance value according to the sleep and sleep enable signal to match the switching signal.