TWI412920B - Power supply device for a portable electronic device - Google Patents

Abstract

A power supply device for a portable electronic device includes a receiver for receiving an indication signal utilized for indicating a connecting status of an external power source corresponding to the portable electronic device, a power storage module for storing electricity, a switch module coupled to the power storage module, a system circuit of the portable electronic device and the receiver, for controlling a current path between the power storage module and the system circuit according to the indication signal and a control signal, and a control module coupled to the power storage module, the switch module and the receiver, for being triggered by electricity stored in the power storage module, to generate the control signal according to the indication signal.

Description

Power supply device for a portable electronic device

The present invention relates to a power supply device for a portable electronic device, and more particularly to a power supply device for correctly switching power supply according to a fitting situation of an external power supply.

Portable electronic devices, such as notebook computers and personal digital assistants, are small in size, light in weight, and easy to carry, allowing users to easily work outside the office (such as on an airplane) and use computers. The various functions of the system, without having to be limited to the bulky desktop computer before the desktop.

In order to achieve the portability requirements, the portable electronic device can use an external power source to perform related functions, and a built-in rechargeable battery for storing electrical energy. Power management of portable electronic devices is particularly important because of the limited amount of power stored in rechargeable batteries.

Please refer to FIG. 1 , which is a schematic diagram of a conventional power supply device 10 . The power supply device 10 is used in a portable electronic device for supplying power to the system circuit 102 of the portable electronic device. The power supply device 10 includes a receiving end 104, a power storage module 100, and a switch module 110. The receiving end 104 is configured to receive an indication signal VIND. The indication signal VIND may be a voltage value VEX _{H of an} external power source PWR_EXT or a signal corresponding to the external power source PWR_EXT, and is used to indicate the fitting state of the external power source PWR_EXT. The power storage module 100 can be a rechargeable battery for storing electrical energy. The switch module 110 is mainly composed of switch transistors 112 and 114 for controlling a current path between the power storage module 100 and the system circuit 102 according to the indication signal VIND. When the external power supply PWR_EXT is not inserted into the portable electronic device, the indication signal VIND is a low voltage, and the switching transistors 112 and 114 are turned on, so that the storage module 100 provides the power required by the system circuit 102 via the switch module 110. . Conversely, when the external power supply PWR_EXT is inserted into the portable electronic device, the indication signal VIND is equal to the voltage value VEX _{H of the} external power supply PWR_EXT, and the closed transistors 112 and 114 are turned off, so that the power storage module 100 cannot supply power via the current path.

Therefore, by the switch module 110, the power supply device 10 can control whether the power storage module 100 supplies power to the system circuit 102 through the current path according to the fitting condition of the external power source PWR_EXT. However, in some cases, for example, when the number of battery packs included in the power storage module 100 varies, the battery voltage of the power storage module 100 may be greater than the voltage value VEX _{H of the} external power supply PWR_EXT. When the voltage is greater than the voltage value VEX _H , the switching transistor 112 may not be properly turned off, that is, the switching transistor 112 is turned on and the switching transistor 114 is turned off. In this case, the power supply provided by the power storage module 100 flows through the body diodes of the switching transistor 112 and the switching transistor 114 to the system circuit 102, thereby causing a problem of leakage current.

In short, the conventional technology cannot effectively switch the opening and closing of the switch module 110, so that the power provided by the power storage module 100 flows through the body diodes of the switch transistor 112 and the switch transistor 114 to the system circuit 102. In addition to possibly causing the system circuit 102 to fail to properly switch the power supply, it also causes unnecessary power consumption and shortens the use time of the power storage module 100.

Accordingly, it is a primary object of the present invention to provide a power supply apparatus for a portable electronic device.

The invention provides a power supply device for a portable electronic device, comprising a receiving end for receiving an indication signal, wherein the indication signal is used to indicate a fitting condition of an external power supply of the portable electronic device; a power storage module for storing electrical energy; a switch module coupled to the power storage module, a system circuit of the portable electronic device, and the receiving end for using the indication signal and a control signal Controlling a current path between the power storage module and the circuit of the system; and a control module coupled to the power storage module, the switch module and the receiving end for storage by the power storage module The power is driven to generate the control signal according to the indication signal.

The present invention further discloses a portable electronic device capable of correctly switching power supplies, comprising a system circuit for implementing the functions of the portable electronic device, and a slot for fitting an external power supply to provide the system And a power supply device comprising: a receiving end for receiving an indication signal, the indication signal is used to indicate a fitting condition of the external power source of the slot; and a power storage module for storing the electrical energy a switch module coupled to the power storage module, a system circuit of the portable electronic device, and the receiving end, configured to control the power storage module to the system according to the indication signal and a control signal a current path between the circuits; and a control module coupled to the power storage module, the switch module, and the receiving end for driving by the power stored by the power storage module, according to the indication signal, The control signal is generated.

Please refer to FIG. 2 , which is a schematic diagram of a power supply device 20 of a portable electronic device according to an embodiment of the present invention. The power supply device 20 is configured to supply power to a system circuit 200 of a portable electronic device (such as a notebook computer), and includes a receiving end 202, a power storage module 204, a switch module 206, and a control module 208. . The receiving end 202 is configured to receive an indication signal VIND. The indication signal VIND may be a voltage value VEX _{H of an} external power source PWR_EXT or a signal corresponding to the external power source PWR_EXT, and is used to indicate the fitting state of the external power source PWR_EXT. Among them, the external power supply PWR_EXT is preferably the airline power provided by the aircraft. The power storage module 204 is a battery pack for storing electrical energy to provide the power required by the system circuit 200. The control module 208 is driven by the power stored in the power storage module 204 to generate a control signal VCON to the switch module 206 according to the indication signal VIND. The switch module 206 is preferably composed of P-type MOS transistors 210 and 214 for controlling the storage module 204 to the system circuit 200 according to the control signal VCON generated by the indication signal VIND and the control module 208. One of the current paths.

Therefore, in the power supply device 20, the control module 208 generates a control signal VCON according to the indication signal VIND to control the conduction of the P-type MOS transistor 210. In this case, the control module 208 can timely turn off the current path between the power storage module 204 and the system circuit 200 to properly switch the power supply, avoid unnecessary power consumption, and prolong the use time of the power storage module 204. It should be noted that the control module 208 generates the control signal VCON according to the indication signal VIND, and the related operation mode is not limited to a specific process. For example, when the external power supply PWR_EXT is inserted into the portable electronic device, the indication signal VIND is equal to the external high voltage VEX _H provided by the external power supply PWR_EXT, and the control module 208 is preferably controlled according to the external high voltage VEX _H . The signal VCON output is one of the battery voltages provided by the power storage module 204. As a result, the transistor 210 is turned off, so that the current path is cut, regardless of whether the external high voltage value VEX _{H is} greater than or less than or equal to the battery voltage. Conversely, when the external power supply PWR_EXT is not inserted into the portable electronic device, the indication signal VIND is equal to an external low voltage VEX _L , and the control module 208 can output the control signal VCON to a low voltage according to the external low voltage VEX _L . As a result, the P-type MOS transistors 210, 214 are turned on, so that the power storage module 204 can supply the power required by the system circuit 200 via the current path.

In order to achieve the above operation mode, please continue to refer to FIG. 3, which is a schematic diagram of an embodiment of the control module 208 in FIG. The control module 208 includes a voltage dividing unit 300, a detecting unit 310, and a tandem unit 320. The voltage dividing unit 300 is configured to receive the indication signal VIND and generate a voltage division result VDIV according to the indication signal VIND. The detecting unit 310 is configured to generate a detection result VDET according to the voltage division result VDIV. The stacking unit 320 is driven by the electrical energy stored in the power storage module 204 for controlling the conduction state of the switch module 206 according to the detection result VDET.

In detail, the voltage dividing unit 300 includes a first voltage dividing resistor 302 and a second voltage dividing resistor 304. The detecting unit 310 is an N-type metal oxide semi-transistor. The cascade unit 320 includes a P-type bipolar junction transistor 322 (acting as an upper bridge switch), an N-type MOS transistor 324 (acting as a lower bridge switch), a first resistor 326, and a second The resistor 328 and a third resistor 330 are as shown in FIG. When the external power supply PWR_EXT is inserted into the portable electronic device, the indication signal VIND is equal to the external high voltage VEX _H , and the voltage dividing unit 300 outputs the voltage division result VDIV as a divided high voltage according to the external high voltage VEX _H to conduct the detection. The unit 310 is such that the detection result VDET is equal to the ground voltage. As a result, the P-type bipolar junction transistor 322 is turned on, and the N-type MOS transistor 324 is turned off, so that the control signal VCON is equal to the battery voltage to turn off the transistor 210. At the same time, since the indication signal VIND is equal to the external high voltage VEX _H , the P-type MOS transistor 214 is also turned off, thereby cutting off the current path. Conversely, when the external power supply PWR_EXT is not inserted into the portable electronic device, the indication signal VIND is equal to the external low voltage VEX _L , and the voltage dividing unit 300 outputs the voltage division result VDIV as a divided low voltage according to the external low voltage VEX _L . The detection transistor 312 is turned off so that the detection result VDET is equal to the battery voltage. As a result, the P-type bipolar junction transistor 322 is turned off, and the N-type MOS transistor 324 is turned on, so that the control signal VCON is equal to the ground voltage to conduct the transistor 210. At the same time, since the indication signal VIND is equal to the external low voltage VEX _L , the P-type MOS transistor 214 is also turned on, so that the power storage module 204 can supply the power required by the system circuit 200 via the current path.

Therefore, by the control module 208, the power supply device 20 can correctly turn on and off the switch module 206, so that the portable electronic device can correctly switch the power supply.

It should be noted that the power supply device 20 of FIG. 2 is a schematic diagram of an embodiment of the present invention, and those skilled in the art can appropriately modify according to different needs, and are not limited thereto. For example, please refer to FIG. 4 , which is a schematic diagram of a portable electronic device 40 according to an embodiment of the present invention. The portable electronic device 40 is a notebook computer that can correctly switch the power source. As shown in FIG. 4, the portable electronic device 40 includes a power supply device 400 designed according to the power supply device 20 of FIG. That is to say, when one of the cabin power supplies PWR_AIR provided by the aircraft is fitted into the portable electronic device 40 through a slot 402, the power supply device 400 can effectively turn off the battery to the system regardless of whether the cabin power PWR_AIR is greater than the voltage of the battery. The current path of the circuit to properly use the cabin power PWR_AIR and avoid leakage currents.

In the conventional power supply device 10, when the battery voltage of the power storage module 100 is greater than the external high voltage VEX _H , the switch module 110 cannot be properly closed, forming a leakage current problem, resulting in unnecessary power consumption. In contrast, regardless of whether the battery voltage of the power storage module 204 is greater than the external high voltage VEX _H , the present invention can correctly switch the switch module 206 through the control module 208, so that the power supply of the portable electronic device can be normal. Switch to ground.

In summary, the present invention correctly switches the supply power of the portable electronic device according to the fitting situation of the external power source, so that the power resource is utilized more efficiently to prolong the use time of the portable electronic device.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

PWR_EXT. . . External power supply

PWR_AIR. . . Cabin power supply

VIND. . . Indication signal

VCON. . . Control signal

VDIV. . . Partial pressure result

VDET. . . Detection result

10, 20, 400. . . Power supply unit

40. . . Portable electronic device

102, 200. . . System circuit

104, 202. . . Receiving end

100, 204. . . Power storage module

110, 206. . . Switch module

106, 108, 212, 302, 304, 326, 328, 330. . . resistance

112, 114, 210, 214, 322, 324. . . Transistor

208. . . Control module

300. . . Partition unit

310. . . Detection unit

320. . . Cascade unit

402. . . Slot

FIG. 1 is a schematic diagram of a power supply device for a portable electronic device.

FIG. 2 is a schematic diagram of a power supply device for a portable electronic device according to an embodiment of the present invention.

Figure 3 is a schematic diagram of an embodiment of a control module in Figure 2.

FIG. 4 is a schematic diagram of a portable electronic device capable of correctly switching power supplies according to an embodiment of the present invention.

PWR_EXT. . . External power supply

VIND. . . Indication signal

VCON. . . Control signal

20. . . Power supply unit

200. . . System circuit

202. . . Receiving end

204. . . Power storage module

206. . . Switch module

208. . . Control module

210, 214. . . Transistor

212. . . resistance

Claims (20)

A power supply device for a portable electronic device, comprising: a receiving end for receiving an indication signal, wherein the indication signal is used to indicate a fitting condition of an external power source of the portable electronic device; a power storage module for storing electrical energy; a switch module coupled to the power storage module, a system circuit of the portable electronic device, and the receiving end for using the indication signal and a control signal, Controlling a current path between the power storage module and the circuit of the system; and a control module coupled to the power storage module, the switch module and the receiving end for storage by the power storage module The power is driven to generate the control signal according to the indication signal. The control module includes: a voltage dividing unit coupled to the receiving end for generating a voltage dividing result according to the indication signal; and a detecting unit And the voltage dividing unit is configured to generate a detection result according to the voltage dividing result; and a stacking unit coupled to the power storage module, the switching unit, and the detecting unit, The electric energy stored in the storage module is driven According to the detection result, the control of the switch module. The power supply device of claim 1, wherein the switch module comprises: a first P-type MOS transistor, a source is coupled to the power storage module, and a gate is coupled to the Control module, and a bungee; and a second P-type MOS transistor includes a source coupled to the system circuit, a gate coupled to the receiving end, and a drain coupled to the first P-type MOS transistor The bungee. The power supply device of claim 2, wherein the switch module further comprises a resistor coupled between the gate of the second P-type MOS transistor and a ground terminal. The power supply device of claim 1, wherein the voltage dividing unit comprises: a first voltage dividing resistor coupled between the receiving end and the detecting unit; and a second voltage dividing resistor, one end thereof The detecting unit is coupled to the first voltage dividing resistor, and the other end is coupled to a ground end. The power supply device of claim 1, wherein the detecting unit is an N-type MOS transistor, a drain is coupled to the cascode unit, a source is coupled to a ground end, and a The gate is coupled to the voltage dividing unit. The power supply device of claim 1, wherein the cascode unit comprises: a P-type dual-carrier junction transistor, an emitter is coupled to the power storage module, and a collector is coupled to the power supply module a switch module, and a base; an N-type MOS transistor, comprising a drain, a gate coupled to the detecting unit, and a source coupled to a ground; a first resistor , coupled between the emitter of the P-type bipolar junction transistor and the base; a second resistor coupled between the base of the P-type bipolar junction transistor and the detecting unit; and a third resistor coupled to the N-type MOS transistor Between the pole and the switch module. The power supply device of claim 1, wherein the portable electronic device is a notebook computer or a portable electronic product. The power supply device of claim 1, wherein the external power source is one of a cabin power supply or a portable power source product. The power supply device of claim 1, wherein the power storage module is a rechargeable battery. The power supply device of claim 1, wherein the indication signal is a voltage value of the external power source or a signal corresponding to the external power source. A portable electronic device capable of switching a power supply source includes: a system circuit for implementing the function of the portable electronic device; and a slot for fitting an external power supply to provide the circuit to the system And a power supply device comprising: a receiving end for receiving an indication signal, wherein the indication signal is used to indicate the fitting condition of the external power source of the slot; a power storage module for storing electrical energy; a switch module coupled to the power storage module, a system circuit of the portable electronic device, and the receiving end for using the indication signal and a control signal Controlling a current path between the power storage module and the circuit of the system; and a control module coupled to the power storage module, the switch module and the receiving end for storage by the power storage module The power is driven to generate the control signal according to the indication signal. The control module includes: a voltage dividing unit coupled to the receiving end for generating a voltage dividing result according to the indication signal; The unit is coupled to the voltage dividing unit for generating a detection result according to the voltage dividing result; and a stacking unit coupled to the power storage module, the switching unit and the detecting unit, The power stored by the power storage module is driven to control the switch module according to the detection result. The portable electronic device of claim 11, wherein the switch module comprises: a first P-type MOS transistor, comprising a source coupled to the power storage module, and a gate coupled The control module, and a drain electrode; and a second P-type MOS transistor, including a source coupled to the system circuit, a gate coupled to the receiving end, and a drain coupled The drain of the first P-type MOS transistor. The portable electronic device of claim 12, wherein the switch module further comprises a resistor coupled between the gate and the ground of the second P-type MOS transistor. The portable electronic device of claim 11, wherein the voltage dividing unit comprises: a first voltage dividing resistor coupled between the receiving end and the detecting unit; and a second voltage dividing resistor, One end is coupled to the detecting unit and the first voltage dividing resistor, and the other end is coupled to a ground end. The portable electronic device of claim 11, wherein the detecting unit is an N-type MOS transistor, a drain is coupled to the cascode unit, and a source is coupled to a ground end. And a gate is coupled to the voltage dividing unit. The portable electronic device of claim 11, wherein the stacking unit comprises: a P-type dual-carrier junction transistor, comprising an emitter coupled to the power storage module, and a collector coupling The switch module, and a base; an N-type MOS transistor, comprising a drain, a gate coupled to the detecting unit, and a source coupled to a ground; a resistor coupled between the emitter of the P-type bipolar junction transistor and the base; a second resistor coupled to the base of the P-type bipolar junction transistor Between the detecting unit and a third resistor coupled to the drain of the N-type MOS transistor and the switch mode Between groups. The portable electronic device of claim 11, wherein the portable electronic device is a notebook computer or a portable electronic product. The power supply device of claim 11, wherein the external power source is one of a cabin power supply or a portable power source product. The power supply device of claim 11, wherein the power storage module is a rechargeable battery. The power supply device of claim 11, wherein the indication signal is a voltage value of the external power source or a signal corresponding to the external power source.