TWI619011B - Power supply apparatus and power supply method - Google Patents

Abstract

A power supply device and a power supply method. The power supply device includes a main power supply circuit, an auxiliary power supply circuit, a switching circuit, and a control circuit. The main power circuit can generate a main voltage to the first path during normal power supply to supply power to the first load. The auxiliary power supply circuit can generate an auxiliary voltage to the second path during standby to supply power to the second load. The first end and the second end of the switch circuit are coupled to the first path and the second path, respectively. During normal powering, the control circuit turns on the switching circuit and controls the auxiliary power circuit to stop outputting the auxiliary voltage. During standby, the control circuit turns off the switching circuit and controls the auxiliary power circuit to resume outputting the auxiliary voltage.

Description

Power supply device and power supply method

The present invention relates to an electrical device, and more particularly to a power supply device and a power supply method.

A power management standard called Advanced Configuration and Power Interface (ACPI) has been widely used to manage the power of electronic devices. Based on the ACPI standard power management mechanism, the state of the electronic device is divided into six states (S0~S5) of different power consumption. An electronic device that implements the ACPI standard, the power supply device having a main power supply circuit (for supplying a voltage of +12V, a voltage of +5V, a voltage of +3.3V, a voltage of -12V, a voltage of -5V, etc.) and an auxiliary power supply circuit (auxiliary power supply circuit for supplying standby voltage 5Vsb or standby voltage 12Vsb). Under the ACPI architecture, when an external AC power source (ie, utility power) supplies power to the power supply device, the conventional auxiliary power supply circuit of the power supply device continues to be generated regardless of whether it is in a normal operating state or in a standby state. Output auxiliary power (standby voltage). Auxiliary power (standby voltage) is supplied to a portion of the electronic device that is to be continuously operated, such as a power management controller and/or other circuits (or components).

Limited by the design of the circuit specification and the topology, in the normal operating state (that is, during the normal power supply period), the power conversion efficiency of the auxiliary power circuit is much lower than the power conversion efficiency of the main power circuit. That is, in normal operating conditions (ie, during normal powering), the auxiliary power circuit consumes too much reactive power.

The present invention provides a power supply device and a power supply method to stop an auxiliary power supply circuit from outputting an auxiliary voltage during normal power supply.

Embodiments of the present invention provide a power supply device including a main power supply circuit, an auxiliary power supply circuit, a switching circuit, and a control circuit. The main power circuit can generate a main voltage to the first path during normal power supply to supply power to the first load. Wherein, the normal power supply period is defined by a power start signal external to the power supply device. The auxiliary power supply circuit can generate an auxiliary voltage to the second path during standby to supply power to the second load. The first end and the second end of the switch circuit are coupled to the first path and the second path, respectively. The control circuit is coupled to the control end of the switch circuit. The control circuit can turn on the switching circuit during normal power supply to supply the main voltage of the main power circuit to the first load and the second load, and the control circuit can control the auxiliary power circuit to stop outputting the auxiliary voltage during the normal power supply. The control circuit can turn off the switching circuit during standby. The control circuit can control the auxiliary power circuit to resume outputting the auxiliary voltage during standby to supply power to the second load.

Embodiments of the present invention provide a power supply method. The power supply method includes: generating, by a main power supply circuit, a main voltage to a first path during normal power supply to supply power to a first load, wherein the normal power supply period is defined by a power start signal external to the power supply device; The power circuit generates an auxiliary voltage to the second path during standby to supply power to the second load; coupling the first end and the second end of the switch circuit to the first path and the second path respectively; during normal power supply, by the control circuit Turning on the switch circuit to supply the main voltage of the main power circuit to the first load and the second load; during the normal power supply, the auxiliary circuit is controlled by the control circuit to stop outputting the auxiliary voltage; during standby, the auxiliary power circuit is controlled by the control circuit The auxiliary voltage is restored to supply power to the second load; and during standby, the switching circuit is turned off by the control circuit.

Based on the above, the power supply device and the power supply method according to the embodiments of the present invention can dynamically control the auxiliary power supply circuit to determine whether the auxiliary power supply circuit outputs an auxiliary voltage. During normal powering, the auxiliary power circuit stops outputting the auxiliary voltage to the second path, and the main power circuit supplies power to the first path and the second path. During standby, the auxiliary power circuit resumes outputting the auxiliary voltage to the second path.

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

The term "coupled (or connected)" as used throughout the specification (including the scope of the claims) may be used in any direct or indirect connection. For example, if the first device is described as being coupled (or connected) to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be A connection means is indirectly connected to the second device. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

1 is a circuit block diagram of a power supply device 100 in accordance with an embodiment of the present invention. In the present embodiment, the power supply device 100 is adapted to supply power to the load in the electronic device 10, for example, to the first load LD1 and the second load LD2 illustrated in FIG. According to the application requirements, the electronic device 10 can be a Tablet PC, a Pocket PC, a personal computer, a notebook computer, a Personal Digital Assistant (PDA), a smart phone, or Other electronic devices. The power management circuit (not shown) of the electronic device 10 can control the power supply device 100 by the power start signal PS. According to the power-on signal PS, the power supply device 100 can decide whether to generate/output the main voltage Vmain. The power management circuit of the electronic device 10 is a conventional technology and will not be described again.

The power start signal PS defines a "normal power supply period". During this normal power supply, the operating state of the electronic device 10 is a normal operating state (for example, the S0 state of the ACPI standard). The power supply device 100 can generate/output a main voltage Vmain during normal power supply to supply power to the first load LD1. The first load LD1 may include a central processing unit, a memory, and/or other circuits (or elements) in accordance with design requirements. The power supply device 100 stops supplying the main voltage Vmain to the first load LD1 during an abnormal power supply period (for example, during standby). In addition, during the standby period, the power supply device 100 generates/outputs an auxiliary voltage (or standby voltage) Vsb to supply power to the second load LD2. According to design requirements, the second load LD2 may include a power management controller and/or other circuits (or components).

Referring to FIG. 1 , the power supply device 100 includes a main power circuit 110 , an auxiliary power circuit 120 , a control circuit 130 , a switch circuit 140 , and a protection detection circuit 150 . According to design requirements, the circuit topology of the main power circuit 110 and/or the auxiliary power circuit 120 may be a forward power conversion circuit, a flyback power conversion circuit, and an active clamp half bridge (Active). Clamp and Half Bridge) Power conversion circuit, Active Clamp and Full Bridge power conversion circuit, Push-Pull power conversion circuit or other power conversion circuit. The main power supply circuit 110 may perform power conversion during the normal power supply to generate the main voltage Vmain to the first path Pth1, thereby supplying power to the first load LD1. The auxiliary power supply circuit 120 may perform power conversion during standby to generate the auxiliary voltage Vsb to the second path Pth2, thereby supplying power to the second load LD2. The first load LD1 may be referred to as a “main power load”, and the second load LD2 may be referred to as an “auxiliary power load” or a “standby voltage load”.

2 is a flow chart showing a power supply method according to an embodiment of the invention. Please refer to FIG. 1 and FIG. 2 . During the normal power supply period (for example, the S0 state of the ACPI standard), the main voltage Vmain can be supplied to the first load LD1 (step S210). The protection detection circuit 150 of the power supply device 10 is coupled to the first path Pth1 to detect the voltage and/or current of the first path Pth1. When the first path Pth1 has an overvoltage event and/or an overcurrent event, that is, when the main power circuit 110 has a fault event (eg, an overvoltage event, an overcurrent event, and/or other event), the protection detection circuit 150 may The fault signal FPO is issued immediately to notify the power supply to inform the system. According to design requirements, the protection detection circuit 150 can be a conventional detection circuit or other protection detection circuit/component.

The first end and the second end of the switch circuit 140 are coupled to the first path Pth1 and the second path Pth2, respectively. The control circuit 130 is coupled to the control terminal of the switch circuit 140. During normal power supply, the control circuit 130 can turn on the switch circuit 140 by the control signal SR, so that the main voltage Vmain of the main power circuit 110 can also be powered to the second via the switch circuit 140 and the second path Pth2. Load LD2 (step S210). During this normal power supply, the control circuit 130 can also control the auxiliary power supply circuit 120 by the control signal Ssb to stop the auxiliary power supply circuit 120 from outputting the auxiliary voltage Vsb (step S210). Due to the design of the circuit specification and the topology, under the condition of heavy load (during the normal power supply period), the power conversion efficiency of the auxiliary power supply circuit 120 is much lower than the power conversion efficiency of the main power supply circuit 110. Therefore, during the normal power supply period, the power consumption of the auxiliary power supply circuit 120 can be saved by stopping the output of the auxiliary voltage Vsb.

During standby, the control circuit 130 may control the auxiliary power supply circuit 120 to restore the output auxiliary voltage Vsb to the second path Pth2 to supply power to the second load LD2 (step S220). Next, the control circuit 130 can turn off the switch circuit 140 (step S220). Therefore, the power supply device 100 can continuously supply power to the second load LD2 during standby or during normal power supply to maintain the second load LD2 in a normal function. The main power supply circuit 110 stops supplying the main voltage Vmain to the first path Pth1 during this standby period, that is, stops supplying power to the first load LD1 (step S220).

In some embodiments, the control circuit 130 can also control the auxiliary power circuit 120 by the control command Sref to adjust the rated voltage level of the auxiliary voltage Vsb. For example, FIG. 3 is a flow chart showing the power supply device 100 of FIG. 1 during switching from standby to normal power supply according to an embodiment of the invention. Please refer to FIG. 1 and FIG. 3. The power-on signal PS indicates the "off state", so the power supply device 100 enters the standby period. During the standby period, the main power supply circuit 110 stops supplying the main voltage Vmain, and the control circuit 130 can generate the control command Sref to notify the auxiliary power supply circuit 120 to set the auxiliary voltage Vsb to "high rated voltage" (step S310). In accordance with the control of the control command Sref, the auxiliary power supply circuit 120 pulls the level of the auxiliary voltage Vsb to the rated voltage Vsb_high. The level of the "high rated voltage" (rated voltage Vsb_high) can be determined according to design requirements. For example, but not limited to, the "high rated voltage" level may be 5 volts or other level.

In step S320, the power supply device 100 determines whether the power-on signal PS is turned "on". When the power-on signal PS is turned "on", that is, during the operation of the power supply device 100, from the standby period to the normal power supply period, step S330 is executed. In step S330, the main power supply circuit 110 generates the main voltage Vmain to the first path Pth1 to supply power to the first load LD1. In step S330, the control circuit 130 may generate a control command Sref to notify the auxiliary power supply circuit 120 to lower the auxiliary voltage Vsb from "high rated voltage" to "low rated voltage". In accordance with the control of the control command Sref, the auxiliary power supply circuit 120 lowers the level of the auxiliary voltage Vsb from the rated voltage Vsb_high to the rated voltage Vsb_low. The level of the "low rated voltage" (rated voltage Vsb_low) can be determined according to design requirements. For example, but not limited to, the "low rated voltage" level may be 4.92 volts or other levels below the "high rated voltage".

After the control circuit 130 controls the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb low to the rated voltage Vsb_low, the control circuit 130 turns on the switching circuit 140 in step S340. After the control circuit 130 turns on the switch circuit 140, the control circuit 130 controls the auxiliary power supply circuit 120 to stop outputting the auxiliary voltage Vsb in step S350. Therefore, during the normal power supply period, the power consumption of the auxiliary power supply circuit 120 can be saved by stopping the output of the auxiliary voltage Vsb. While the auxiliary power supply circuit 120 stops outputting the auxiliary voltage Vsb, the load of the second path Pth2 can be continuously supplied by the conduction switch circuit 140. Therefore, the power supply device 100 can continuously supply power to the second load LD2 during standby or during normal power supply to maintain the second load LD2 in a normal function.

4 is a flow chart showing the power supply device 100 of FIG. 1 when a failure event occurs during a normal power supply period, in accordance with an embodiment of the present invention. The power-on signal PS indicates the "on state", so the power supply device 100 enters the normal power supply period. 3, during the normal power supply, the main power circuit 110 generates the main voltage Vmain to the first path Pth1, and the control circuit 130 can generate the control command Sref to indicate the "low rated voltage", the switch circuit 140 is turned on, and the auxiliary The power supply circuit 120 stops outputting the auxiliary voltage Vsb (step S410).

Please refer to FIG. 1 and FIG. 4. In step S420, the protection detection circuit 150 determines whether the power supply device 100 has a fault event (eg, an overvoltage event, an overcurrent event, and/or other event) to generate the fault signal FPO. When the failure signal FPO indicates that a failure event has occurred, step S430 is executed.

When the fault signal FPO of the protection detecting circuit 150 of the power supply device 100 indicates that a failure event has occurred in the main power circuit 110, the control circuit 130 may generate a control command Sref indicating "high rated voltage" to control the auxiliary power circuit 120 (step S430). ). In accordance with the control of the control command Sref, the auxiliary power supply circuit 120 pulls the level of the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high. Next, the control circuit 130 can control the auxiliary power supply circuit 120 by the control signal Ssb to cause the auxiliary power supply circuit 120 to restore the output auxiliary voltage Vsb (step S440). After the auxiliary power supply circuit 120 resumes the output auxiliary voltage Vsb, the control circuit 130 may turn off the switching circuit 140 (step S450). Therefore, regardless of whether or not the main power supply circuit 110 has a failure event, the power supply device 100 can continuously supply power to the second load LD2 to maintain the second load LD2 in a normal function.

FIG. 5 is a flow chart showing the power supply device 100 of FIG. 1 when a failure event occurs during a normal power supply period in accordance with another embodiment of the present invention. Steps S410 to 4450 shown in FIG. 5 can refer to the related description of FIG. 4, and therefore will not be described again. In the embodiment shown in FIG. 5, when the fault signal FPO of the protection detecting circuit 150 of the power supply device 100 indicates that the main power circuit 110 has a failure event, step S430 and step S440 can be performed simultaneously. After the auxiliary power supply circuit 120 resumes outputting the auxiliary voltage Vsb, the control circuit 130 may proceed to step S450 to turn off the switching circuit 140.

FIG. 6 is a flow chart showing the power supply device 100 of FIG. 1 during a period of switching from a normal power supply to a standby period, in accordance with an embodiment of the present invention. The power-on signal PS indicates the "on state", so the power supply device 100 enters the normal power supply period. 3, during the normal power supply, the main power circuit 110 generates the main voltage Vmain to the first path Pth1, and the control circuit 130 can generate the control command Sref to indicate the "low rated voltage", the switch circuit 140 is turned on, and the auxiliary The power supply circuit 120 stops outputting the auxiliary voltage Vsb (step S610).

Please refer to FIG. 1 and FIG. 6. In step S620, the power supply device 100 determines whether the power-on signal PS is turned to the "off state". When the power-on signal PS is turned to the "off state", that is, during the operation of the power supply device 100, the normal power supply period is switched to the standby period, and step S630 is executed. In step S630, the main power supply circuit 110 stops supplying the main voltage Vmain, and the control circuit 130 can generate a control command Sref indicating "high rated voltage" to the auxiliary power supply circuit 120. In accordance with the control of the control command Sref, the auxiliary power supply circuit 120 pulls the level of the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high.

After the control circuit 130 controls the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high, the control circuit 130 can control the auxiliary power supply circuit 120 by the control signal Ssb to cause the auxiliary power supply circuit 120 to resume outputting the The auxiliary voltage Vsb (step S640). After the control circuit 130 controls the auxiliary power supply circuit 120 to resume the output auxiliary voltage Vsb, the control circuit 130 may turn off the switching circuit 140 (step S650). Therefore, the power supply device 100 can continuously supply power to the second load LD2 during standby or during normal power supply, so that the second load LD2 maintains a normal function.

During standby, the control circuit 130 can control the auxiliary power supply circuit 120 to raise the level of the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high, wherein the rated voltage Vsb_low is lower than the rated voltage level of the main voltage Vmain, and the rated voltage Vsb_high It can be substantially the same as the rated voltage level of the main voltage Vmain. Therefore, during standby, the power supply device 100 can supply power to the second load LD2 to maintain the second load LD2 in a normal function. During non-standby periods (eg, during normal powering), control circuit 130 may control auxiliary power supply circuit 120 to pull auxiliary voltage Vsb from nominal voltage Vsb_high to rated voltage Vsb_low. By lowering the level of the auxiliary voltage Vsb to the rated voltage Vsb_low, when the switching circuit 140 is turned on, it can be ensured that the voltage of the first path Pth1 is greater than the voltage of the second path.

FIG. 7 is a block diagram showing the circuit of the switch circuit 140 of FIG. 1 according to an embodiment of the invention. In the embodiment shown in FIG. 7, the switch circuit 140 includes a resistor 141 and a switch 142. The resistance of the resistor 141 can be determined according to design requirements. The first end of the resistor 141 is coupled to the first path Pth1. The first end of the switch 142 is coupled to the second end of the resistor 141. The second end of the switch 142 is coupled to the second path Pth2. The control end of the switch 142 is coupled to the control circuit 130 to receive the control signal SR. The control circuit 130 can turn on the switch 142 by the control signal SR so that the main voltage Vmain output by the main power supply circuit 110 can be transmitted from the first path Pth1 to the second path Pth2 via the switch 142.

FIG. 8 is a block diagram showing the circuit of the switch circuit 140 of FIG. 1 in accordance with another embodiment of the present invention. In the embodiment shown in FIG. 8, the switch circuit 140 includes a resistor 141 and a switch 142. The control end of the switch 142 is coupled to the control circuit 130 to receive the control signal SR. The first end of the switch 142 is coupled to the first path Pth1. The first end of the resistor 141 is coupled to the second end of the switch 142. The second end of the resistor 141 is coupled to the second path Pth2.

FIG. 9 is a block diagram showing the circuit of the switch circuit 140 of FIG. 1 according to still another embodiment of the present invention. In the embodiment shown in FIG. 9, the switch circuit 140 includes a resistor 141, a switch 142, and a resistor 143. The first end of the resistor 141 is coupled to the first path Pth1. The control end of the switch 142 is coupled to the control circuit 130 to receive the control signal SR. The first end of the switch 142 is coupled to the second end of the resistor 141. The first end of the resistor 143 is coupled to the second end of the switch 142. The second end of the resistor 143 is coupled to the second path Pth2.

FIG. 10 is a block diagram showing the circuit of the control circuit 130 of FIG. 1 according to an embodiment of the invention. In the embodiment shown in FIG. 10, the control circuit 130 includes a start control circuit 131, an intermediate circuit 132, an auxiliary power supply control circuit 133, and a switch control circuit 134. The input of the startup control circuit 131 can receive the power enable signal PS. The start control circuit 131 correspondingly generates an internal enable signal PS' in accordance with the power start signal PS. The intermediate circuit 132 is coupled to the output of the start control circuit 131 to receive the internal enable signal PS'. Depending on the internal enable signal PS', the intermediate circuit 132 can correspondingly generate the internal signal Ssb' and the internal signal SR'.

The auxiliary power control circuit 133 is coupled to the intermediate circuit 132 to receive the internal signal Ssb'. The auxiliary power supply control circuit 133 correspondingly generates the control signal Ssb to the auxiliary power supply circuit 120 in accordance with the internal signal Ssb'. In accordance with the control of the control signal Ssb, the auxiliary power supply circuit 120 stops outputting the auxiliary voltage Vsb during normal power supply, and restores the output auxiliary voltage Vsb during standby.

Switch control circuit 134 is coupled to intermediate circuit 132 to receive internal signal SR'. The switch control circuit 134 correspondingly generates a control signal SR to the control terminal of the switch circuit 140 in accordance with the internal signal SR'. In accordance with the control of the control signal SR, the switch circuit 140 is turned on during normal power supply and is turned off during standby. The turned-on switching circuit 140 can transfer the main voltage Vmain of the first path Pth1 to the second path Pth2.

In the embodiment shown in Fig. 10, the intermediate circuit 132 further generates an internal signal Sref' in accordance with the internal enable signal PS'. The control circuit 130 further includes a level adjustment circuit 135. The level adjustment circuit 135 is coupled to the intermediate circuit 132 to receive the internal signal Sref'. The level adjustment circuit 135 correspondingly generates a control command Sref to the auxiliary power supply circuit 120 in accordance with the internal signal Sref'. Therefore, according to the internal signal Sref', the level adjusting circuit 135 can control the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high during standby, and to control during the non-standby period (for example, during normal power supply). The auxiliary power supply circuit 120 pulls the auxiliary voltage Vsb from the rated voltage Vsb_high to the rated voltage Vsb_low.

Upon entering the normal power supply period from the standby period, based on the control of the intermediate circuit 132, the level adjustment circuit 135 can control the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb from the rated voltage Vsb_high to the rated voltage Vsb_low. After the level adjustment circuit 135 controls the auxiliary power supply circuit 120 to pull down the auxiliary voltage Vsb to the rated voltage Vsb_low, the switch control circuit 134 can turn on the switch circuit 140 based on the control of the intermediate circuit 132. After the switch control circuit 134 turns on the switch circuit 140, based on the control of the intermediate circuit 132, the auxiliary power supply control circuit 133 can control the auxiliary power supply circuit 120 to stop outputting the auxiliary voltage Vsb. Detailed operations can be analogized with reference to the related description of FIG.

Upon entering the standby period from the normal power supply period, based on the control of the intermediate circuit 132, the level adjustment circuit 135 can control the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high. After the level adjustment circuit 135 controls the auxiliary power supply circuit 120 to pull the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high, the auxiliary power supply control circuit 133 can control the auxiliary power supply circuit 120 to resume the output auxiliary voltage Vsb based on the control of the intermediate circuit 132. . After the auxiliary power supply control circuit 133 controls the auxiliary power supply circuit 120 to resume the output auxiliary voltage Vsb, the switch control circuit 134 can turn off the switch circuit 140 based on the control of the intermediate circuit 132. Detailed operations can be analogized with reference to the related description of FIG. 6.

In the embodiment shown in FIG. 10, the auxiliary power control circuit 133 and the level adjusting circuit 135 are further coupled to the protection detecting circuit 150 to receive the fault signal FPO. When the fault signal FPO of the protection detecting circuit 150 indicates that the main power circuit 110 has a fault event, the level adjusting circuit 135 controls the auxiliary power circuit 120 to immediately pull the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high, and assists The power supply control circuit 133 controls the auxiliary power supply circuit 120 to instantly restore the output auxiliary voltage Vsb. After the auxiliary power supply circuit 120 resumes outputting the auxiliary voltage Vsb, the switch control circuit 134 immediately turns off the switch circuit 140. The detailed operation can be analogized with reference to the related description of FIG. 4 or FIG. 5.

In the embodiment shown in FIG. 10, the control circuit 130 further includes an output voltage comparison circuit 136. The first input end of the output voltage comparison circuit 136 is coupled to the first path Pth1 to receive the main voltage Vmain. The second input end of the output voltage comparison circuit 136 is coupled to the second path Pth2 to receive the auxiliary voltage Vsb. The output voltage comparison circuit 136 can compare the main voltage Vmain with the auxiliary voltage Vsb to obtain a comparison result Scmp. The comparison result Scmp is supplied to the intermediate circuit 132. Based on the comparison result Scmp and the internal enable signal PS', the intermediate circuit 132 can generate the internal signal Ssb' and the internal signal SR'.

FIG. 11 is a block diagram showing the circuit of the output voltage comparison circuit 136 of FIG. 10 in accordance with an embodiment of the present invention. The output voltage comparison circuit 136 shown in FIG. 11 can refer to the related description of FIG. In the embodiment shown in FIG. 11, the output voltage comparison circuit 136 includes a voltage dividing circuit 136_1, a voltage dividing circuit 136_2, and a comparator 136_3.

The voltage dividing circuit 136_1 is coupled to the second path Pth2 to receive the auxiliary voltage Vsb. The voltage dividing circuit 136_1 divides the auxiliary voltage Vsb at a first ratio RA1 to generate a first divided voltage to a first input terminal (eg, a non-inverting input terminal) of the comparator 136_3. The voltage dividing circuit 136_1 includes a resistor R1 and a resistor R2. The first end of the resistor R1 is coupled to the second path Pth2 to receive the auxiliary voltage Vsb. The first end of the resistor R2 is coupled to the second end of the resistor R1. The second end of the resistor R2 is coupled to a reference voltage (eg, a ground voltage). Wherein, the first ratio RA1 is R2/(R1+R2), and the first partial pressure is RA1*Vsb.

The voltage dividing circuit 136_2 is coupled to the first path Pth1 to receive the main voltage Vmain. The voltage dividing circuit 136_2 divides the main voltage Vmain at a second ratio RA2 to generate a second divided voltage to the second input terminal (eg, the inverting input terminal) of the comparator 136_3. The voltage dividing circuit 136_2 includes a resistor R3 and a resistor R4. The first end of the resistor R3 is coupled to the first path Pth1 to receive the main voltage Vmain. The first end of the resistor R4 is coupled to the second end of the resistor R3. The second end of the resistor R4 is coupled to a reference voltage (eg, a ground voltage). Wherein, the second ratio RA2 is R4/(R3+R4), and the second partial pressure is RA2*Vmain. The second ratio RA2 is greater than or equal to the first ratio RA1.

The output of comparator 136_3 produces a comparison result Scmp to intermediate circuit 132. The output voltage comparison circuit 136 can more selectively configure the pull-up resistor 136_4. The first end of the pull-up resistor 136_4 is coupled to the output of the comparator 136_3. The second end of the pull-up resistor 136_4 is coupled to a voltage source, for example, to the auxiliary power circuit 120 to receive the auxiliary voltage Vsb. In the embodiment shown in FIG. 11, the first input of the comparator 136_3 is further coupled to the output of the start control circuit 131 to receive the internal enable signal PS'.

FIG. 12 is a block diagram showing the circuit of the startup control circuit 131 of FIG. 10 in accordance with an embodiment of the present invention. The startup control circuit 131 shown in FIG. 12 can refer to the related description of FIG. The startup control circuit 131 includes an amplification circuit. An input of the amplifying circuit receives a power enable signal PS, and an output of the amplifying circuit is coupled to the intermediate circuit 132 to provide an internal enable signal PS'.

In the embodiment shown in FIG. 12, the amplifying circuit of the start control circuit 131 includes an operational amplifier 131_1. A first input (eg, a non-inverting input) of operational amplifier 131_1 receives a power enable signal PS. A second input terminal (eg, an inverting input terminal) of the operational amplifier 131_1 is coupled to an output terminal of the operational amplifier 131_1. The output of operational amplifier 131_1 is coupled to intermediate circuit 132 to provide an internal enable signal PS'. In detail, the amplifying circuit of the startup control circuit 131 includes an operational amplifier 131_1, a resistor 131_2, a diode 131_3, a resistor 131_4, and a capacitor 131_5. The first end of the resistor 131_2 receives the power start signal PS. The cathode of the diode 131_3 is coupled to the first end of the resistor 131_2. The anode of the diode 131_3 is coupled to the second end of the resistor 131_2. The first end of the resistor 131_4 is connected to the second end of the resistor 131_2. The second end of the resistor 131_4 is coupled to a reference voltage (eg, a ground voltage). The first end of the capacitor 131_5 is coupled to the second end of the resistor 131_2. The second end of the capacitor 131_5 is coupled to a reference voltage (eg, a ground voltage). A first input terminal (eg, a non-inverting input terminal) of the operational amplifier 131_1 is coupled to the second terminal of the resistor 131_2.

FIG. 13 is a block diagram showing the circuit of the startup control circuit 131 of FIG. 10 in accordance with another embodiment of the present invention. The startup control circuit 131 shown in FIG. 13 includes an amplification circuit including an operational amplifier 131_1, a resistor 131_2, a diode 131_3, a resistor 131_4, a capacitor 131_5, and a non-inverting amplifier 131_6. The operational amplifier 131_1, the resistor 131_2, the diode 131_3, the resistor 131_4, and the capacitor 131_5 shown in FIG. 13 can be referred to the related description of FIG. 12, and therefore will not be described again. In the embodiment shown in FIG. 13, the output of the operational amplifier 131_1 is coupled to the input of the non-inverting amplifier 131_6. The output of the non-inverting amplifier 131_6 is coupled to the intermediate circuit 132 to provide an internal enable signal PS'.

FIG. 14 is a block diagram showing the circuit of the intermediate circuit 132 of FIG. 10 in accordance with an embodiment of the present invention. The intermediate circuit 132 shown in FIG. 14 can be referred to the related description of FIG. The intermediate circuit 132 shown in FIG. 14 includes an operational amplifier 132_1, a resistor 132_2, a diode 132_3, and a comparison circuit 132_4. A first input terminal (eg, a non-inverting input terminal) of the operational amplifier 132_1 is coupled to an output of the output voltage comparison circuit 136 to receive the comparison result Scmp. The first end of the resistor 132_2 is coupled to the output of the start control circuit 131 to receive the internal enable signal PS'. The anode of the diode 132_3 is coupled to the second end of the resistor 132_2. The cathode of the diode is coupled to the first input of the operational amplifier 132_1.

The intermediate circuit 132 can also configure the resistor 132_5 and the capacitor 132_6 according to design requirements. The first end of the resistor 132_5 is coupled to the first input terminal of the operational amplifier 132_1. The second end of the resistor 132_5 is coupled to a reference voltage (eg, a ground voltage). The first end of the capacitor 132_6 is coupled to the first input of the operational amplifier 132_1. The second end of the capacitor 132_6 is coupled to a reference voltage (eg, a ground voltage).

A second input (eg, an inverting input) of the operational amplifier 132_1 is coupled to an output of the operational amplifier 132_1. The output of operational amplifier 132_1 produces an internal signal SR' to switch control circuit 134. The input of the comparison circuit 132_4 is coupled to the output of the operational amplifier 132_1 to receive the internal signal SR'. The comparison circuit 132_4 compares the internal signal SR' with the reference voltage Vref1 to obtain a comparison result, and uses this comparison result as the internal signal Ssb' and the internal signal Sref'. The level of the reference voltage Vref1 can be determined according to design requirements.

Any comparison circuit/component (such as a conventional comparison circuit or other voltage comparator) can be used to implement the comparison circuit 132_4. In the embodiment shown in FIG. 14, the comparison circuit 132_4 includes a resistor 1401, a capacitor 1402, a reference voltage source 1403, and a comparator 1404. The first end of the first resistor 1401 is coupled to the output of the operational amplifier 132_1 to receive the internal signal SR'. The first end of the capacitor 1402 is coupled to the second end of the resistor 1401. The second end of the capacitor 1402 is coupled to a reference voltage (eg, a ground voltage). The reference voltage source 1403 can provide a reference voltage Vref1 to the comparator 1404. Any reference voltage generating circuit/component, such as a conventional reference voltage source or other reference voltage generator, can be used to implement the reference voltage source 1403. A first input (eg, a non-inverting input) of the comparator 1404 is coupled to a second end of the first resistor 1401. The second input terminal (eg, the inverting input terminal) of the comparator 1404 is coupled to the reference voltage source 1403 to receive the reference voltage Vref1. The output of the comparator 1404 generates an internal signal Ssb' to the auxiliary power supply control circuit 133, and generates an internal signal Sref' to the level adjustment circuit 135.

Figure 15 is a block diagram showing the circuit of the switch control circuit 134 of Figure 10 in accordance with an embodiment of the present invention. The switch control circuit 134 shown in FIG. 15 can refer to the related description of FIG. In the embodiment shown in FIG. 15, the switch control circuit 134 includes a diode 134_1, a resistor 134_2, and a comparison circuit 134_3. The anode of the diode 134_1 is coupled to the intermediate circuit 132 to receive the internal signal SR'. The first end of the resistor 134_2 is coupled to the cathode of the diode 134_1.

The switch control circuit 134 can also configure the resistor 134_4 and the capacitor 134_6 according to design requirements. The first end of the resistor 134_4 is coupled to the second end of the resistor 134_2. The second end of the resistor 134_4 is coupled to a reference voltage (eg, a ground voltage). The first end of the capacitor 134_5 is coupled to the second end of the resistor 134_2. The second end of the capacitor 134_5 is coupled to a reference voltage (eg, a ground voltage).

The input end of the comparison circuit 134_3 is coupled to the second end of the resistor 134_2. The comparison circuit 134_3 compares the second internal signal SR' with the reference voltage Vref2 to obtain a comparison result, and transmits the comparison result as a control signal SR to the control terminal of the switching circuit 140. The level of the reference voltage Vref2 can be determined according to design requirements.

Any comparison circuit/component (such as a conventional comparison circuit or other voltage comparator) can be used to implement the comparison circuit 134_3. In the embodiment shown in FIG. 15, the comparison circuit 134_3 includes a reference voltage source 1501, a comparator 1502, a resistor 1503, a diode 1504, and a pull-up resistor 1505. The reference voltage source 1501 can provide a reference voltage Vref2 to the comparator 1502. Any reference voltage generating circuit/component, such as a conventional reference voltage source or other reference voltage generator, can be used to implement the reference voltage source 1501.

A first input (eg, a non-inverting input) of the comparator 1502 is coupled to the reference voltage source 1501 to receive the reference voltage Vref2. A second input (eg, an inverting input) of the comparator 1502 is coupled to the second end of the resistor 134_2. The first end of the resistor 1503 is coupled to the output of the comparator 1502. The second end of the resistor 1503 is coupled to the control terminal of the switch circuit 140 to provide a control signal SR. The anode of the diode 1504 is coupled to the output of the comparator 1502. The cathode of the diode 1504 is coupled to the control terminal of the switching circuit 140. The first end of the pull-up resistor 1505 is coupled to the output of the comparator 1502. The second end of the pull-up resistor 1505 is coupled to the voltage source 12V.

Figure 16 is a block diagram showing the circuit of the auxiliary power supply control circuit 133 of Figure 10 in accordance with an embodiment of the present invention. The auxiliary power supply control circuit 133 shown in Fig. 16 can refer to the related description of Fig. 10. In the embodiment shown in FIG. 16, the auxiliary power supply control circuit 133 includes a comparison circuit 133_1, a resistor 133_2, a photocoupled transistor 133_3, a light-coupled light-emitting diode 133_4, a resistor 133_5, a light-coupled light-emitting diode 133_6, and an optically coupled power. The crystal 133_7 and the comparison circuit 133_8. The input of the comparison circuit 133_1 is coupled to the intermediate circuit 132 to receive the internal signal Ssb'. The comparison circuit 133_1 compares the internal signal Ssb' with the reference voltage Vref3 to obtain a comparison result. The first end of the resistor 133_2 is coupled to the output of the comparison circuit 133_1 to receive the comparison result.

A first end (eg, an emitter) of the optical coupling transistor 133_3 is coupled to a second end of the resistor 133_2. The anode of the light-coupled light-emitting diode 133_4 is coupled to a voltage source, for example, to the auxiliary power circuit 120 to receive the auxiliary voltage Vsb. The light emitted by the light-coupled light-emitting diode 133_4 can be received by the gate of the light-coupled transistor 133_3. The first end of the resistor 133_5 is coupled to the cathode of the light coupling LED 133_4. The second end of the resistor 133_5 is coupled to the protection detecting circuit 150 of the power supply device 100 to receive the fault signal FPO.

The cathode of the light-coupled light-emitting diode 133_6 is coupled to the second end (eg, the collector) of the light-coupled transistor 133_3. The anode of the light-coupled light-emitting diode 133_6 is coupled to a voltage source 5V. The gate of the optical coupling transistor 133_7 receives the light emitted by the light-coupled light-emitting diode 133_6. The first end (eg, the collector) of the optical coupling transistor 133_7 is coupled to the voltage source 5V. The first input of the comparison circuit 133_8 is coupled to the second end (eg, the emitter) of the optical coupling transistor 133_7. The second input of the comparison circuit 133_8 is coupled to the voltage source Vref4. The voltage level of the voltage source Vref4 can be determined according to design requirements. The output of the comparison circuit 133_8 generates a control signal Ssb to the auxiliary power supply circuit 120. Any voltage comparison circuit/component (such as a conventional voltage comparator or other voltage comparator) can be used to implement the comparison circuit 133_8.

Any voltage comparison circuit/component, such as a conventional voltage comparator or other voltage comparator, can be used to implement comparison circuit 133_1. For example, in the embodiment shown in FIG. 16, the comparison circuit 133_1 includes a reference voltage source 1601, a resistor 1602, a diode 1603, and a comparator 1604. The reference voltage source 1601 can provide a reference voltage Vref3 to the comparator 1604. Any reference voltage generating circuit/component, such as a conventional reference voltage source or other reference voltage generator, can be used to implement the reference voltage source 1601. The first end of the resistor 1602 is coupled to the intermediate circuit 132 to receive the internal signal Ssb'. The anode of the diode 1603 is coupled to the first end of the resistor 1602. The cathode of the diode is coupled to the second end of the resistor 1602. A first input (eg, a non-inverting input) of comparator 1604 is coupled to a second end of resistor 1602. A second input (eg, an inverting input) of the comparator 1604 is coupled to the reference voltage source 1601 to receive the reference voltage Vref3. The output of the comparator 1604 is coupled to the first end of the resistor 133_2.

According to the design requirements, in the embodiment shown in FIG. 16, the auxiliary power control circuit 133 can also configure the diode 133_9 and the resistor 133_10. The anode of the diode 133_9 is coupled to the output of the start control circuit 131 to receive the internal enable signal PS'. The first end of the resistor 133_10 is coupled to the cathode of the diode 133_9. The second end of the resistor 133_10 is coupled to the input end of the comparison circuit 133_1. In the embodiment shown in FIG. 16, the second end of the resistor 133_10 can be coupled to the first input of the comparator 1604.

FIG. 17 is a block diagram showing the circuit of the auxiliary power supply circuit 120 of FIG. 1 and the level adjustment circuit 135 of FIG. 10 according to an embodiment of the invention. In the embodiment shown in FIG. 17, the auxiliary power supply circuit 120 includes a power converter 121, a resistor 122, and a resistor 123. The power converter 121 can perform power conversion to generate the auxiliary voltage Vsb. According to design requirements, the power converter 121 can be a forward power conversion circuit, a reverse power conversion circuit, an active clamp half bridge power conversion circuit, an active clamp full bridge power conversion circuit, and a push-pull power conversion circuit. Or other power conversion circuits. In accordance with the control of the control signal Ssb, the power converter 121 can determine whether to stop driving the power transistor inside the power converter 121, thereby determining whether to stop outputting the auxiliary voltage Vsb. The feedback circuit of the auxiliary power supply circuit 120 includes a resistor 122 and a resistor 123. The first end of the resistor 122 is coupled to the output of the power converter 121 to receive the auxiliary voltage Vsb. The second end of the resistor 122 is coupled to the feedback voltage dividing node 124. The first end of the resistor 123 is coupled to the feedback voltage dividing node 124. The second end of the resistor 123 is coupled to a reference voltage (eg, a ground voltage). The voltage of the feedback voltage dividing node 124 is fed back to the power converter 121.

The level adjustment circuit 135 shown in FIG. 17 can refer to the related description of FIG. In the embodiment shown in FIG. 17, the level adjustment circuit 135 includes a switch 135_1 and a resistor 135_2. The first end of the switch 135_1 (eg, the source or emitter of the transistor) is coupled to a reference voltage (eg, a ground voltage). The control terminal of switch 135_1 (e.g., the gate or base of the transistor) is coupled to intermediate circuit 132 to receive internal signal Sref'. The first end of the resistor 135_2 is coupled to the second end of the switch 135_1 (eg, the drain or collector of the transistor). The second end of the resistor 135_2 is coupled to the feedback voltage dividing node 124 inside the auxiliary power circuit 120 to provide a control command Sref. When the switch 135_1 is turned on, the voltage of the feedback voltage dividing node 124 is pulled down, so that the level of the auxiliary voltage Vsb is raised, for example, from the rated voltage Vsb_low to the rated voltage Vsb_high. When the switch 135_1 is turned off, the voltage of the feedback voltage dividing node 124 is pulled high, so that the level of the auxiliary voltage Vsb is lowered, for example, from the rated voltage Vsb_high to the rated voltage Vsb_low. The resistance of the resistor 135_2, the resistor 122, and the resistor 123 can be determined according to design requirements.

FIG. 18 is a block diagram showing the circuit of the auxiliary power supply circuit 120 of FIG. 1 and the level adjustment circuit 135 of FIG. 10 according to another embodiment of the present invention. The auxiliary power supply circuit 120 shown in FIG. 18 can refer to the related description of FIG. 17, and therefore will not be described again. In the embodiment shown in FIG. 18, the level adjusting circuit 135 includes a switch 135_1, a resistor 135_2, a diode 135_3, a resistor 135_4, a resistor 135_5, a resistor 135_6, a diode 135_7, and a diode 135_8. The switch 135_1 and the resistor 135_2 shown in FIG. 18 can be referred to the related description of FIG. 17, and therefore will not be described again.

The anode of the diode 135_3 is coupled to the output of the auxiliary power supply circuit 120 to receive the auxiliary voltage Vsb. The first end of the resistor 135_4 is coupled to the cathode of the diode 135_3. The second end of the resistor 135_4 is coupled to the intermediate circuit 132 to receive the internal signal Sref'. The first end of the resistor 135_5 is coupled to the intermediate circuit 132 to receive the internal signal Sref'. The second end of the resistor 135_5 is coupled to the control end of the switch 135_1. The first end of the resistor 135_6 is coupled to the second end of the resistor 135_5. The second end of the resistor 135_6 is coupled to a reference voltage (eg, a ground voltage).

The anode of the diode 135_7 is coupled to the output of the start control circuit 131 to receive the internal enable signal PS'. The cathode of the diode 135_7 is coupled to the control terminal of the switch 135_1. Therefore, when the internal enable signal PS' transitions from the low logic level to the high logic level (indicating the period from the normal power supply period to the standby period during the operation of the power supply device 100), the internal enable signal PS' can turn on the switch 135_1 instantaneously. In order to quickly raise the level of the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high.

The anode of the diode 135_8 is coupled to the protection detecting circuit 150 to receive the fault signal FPO. The cathode of the diode 135_8 is coupled to the control terminal of the switch 135_1. Therefore, when the main power circuit 110 has a fault event, the fault signal FPO can immediately turn on the switch 135_1 to quickly pull the level of the auxiliary voltage Vsb from the rated voltage Vsb_low to the rated voltage Vsb_high.

It should be noted that in different application scenarios, the related functions of the control circuit 130, the startup control circuit 131, the intermediate circuit 132, the auxiliary power control circuit 133, and/or the switch control circuit 134 can utilize a general programming language (programming languages) , such as C or C++), hardware description languages (such as Verilog HDL or VHDL) or other suitable programming language to implement as software, firmware or hardware. The programming language that can perform the related functions can be arranged as any known computer-accessible media, such as magnetic tapes, semiconductors, magnetic disks, or optical disks. (compact disks, such as CD-ROM or DVD-ROM), or the programming language can be transmitted over the Internet, wired communication, wireless communication, or other communication medium. The programming language can be stored in an accessible medium of the computer such that the programming code of the programming language is accessed/executed by a processor of the computer. Additionally, the apparatus and method of the present invention can be implemented by a combination of hardware and software.

In summary, the power supply device 100 and the power supply method of the embodiments of the present invention can dynamically control the auxiliary power supply circuit 120 to determine whether the auxiliary power supply circuit 120 outputs an auxiliary voltage. During normal power supply (eg, in the S0 state of the ACPI standard), the main power supply circuit 110 supplies the main voltage Vmain to the first path Pth1, the main power supply circuit 110 supplies the main voltage Vmain to the second path Pth2 via the switch circuit 140, and the auxiliary power supply circuit. 120 stops outputting the auxiliary voltage Vsb to the second path Pth2. Therefore, during the normal power supply period, the power consumption of the auxiliary power supply circuit 120 can be saved by stopping the output of the auxiliary voltage Vsb. During standby, the auxiliary power supply circuit 120 resumes outputting the auxiliary voltage Vsb to the second path Pth2, the switching circuit 140 is turned off, and the main power supply circuit 110 stops supplying the main voltage Vmain. Therefore, the power supply device 100 can continuously supply power to the second load LD2 during standby or during normal power supply to maintain the second load LD2 in a normal function.

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

10‧‧‧Electronic devices
100‧‧‧Power supply unit
110‧‧‧Main power circuit
120‧‧‧Auxiliary power circuit
121‧‧‧Power Converter
122‧‧‧resistance
123‧‧‧resistance
124‧‧‧Review of the pressure divider node
130‧‧‧Control circuit
131‧‧‧Start control circuit
131_1‧‧‧Operational Amplifier
131_2, 131_4‧‧‧ resistance
131_3‧‧‧ diode
131_5‧‧‧ capacitor
131_6‧‧‧Non-inverting amplifier
132‧‧‧Intermediate circuit
132_1‧‧‧Operational Amplifier
132_2‧‧‧resistance
132_3‧‧‧ diode
132_4‧‧‧Comparative circuit
132_5‧‧‧resistance
132_6‧‧‧ Capacitance
133‧‧‧Auxiliary power control circuit
133_1‧‧‧Comparative circuit
133_2‧‧‧resistance
133_3‧‧‧Optical coupling transistor
133_4‧‧‧Light-coupled light-emitting diode
133_5‧‧‧resistance
133_6‧‧‧Photocoupled Light Emitting Diodes
133_7‧‧‧Optical coupling transistor
133_8‧‧‧Comparative circuit
133_9‧‧ ‧ diode
133_10‧‧‧resistance
134‧‧‧Switch control circuit
134_1‧‧‧dipole
134_2‧‧‧resistance
134_3‧‧‧Comparative circuit
134_4‧‧‧resistance
134_6‧‧‧ capacitor
135‧‧ ‧ level adjustment circuit
135_1‧‧‧ switch
135_2‧‧‧resistance
135_3‧‧‧ diode
135_4, 135_5, 135_6‧‧‧ resistance
135_7, 135_8‧‧‧ diode
136‧‧‧Output voltage comparison circuit
136_1, 136_2‧‧‧ voltage divider circuit
136_3‧‧‧ comparator
136_4‧‧‧ Pull-up resistor
140‧‧‧Switch circuit
141, 143‧‧‧ resistance
142‧‧‧ switch
150‧‧‧Protection detection circuit
1401‧‧‧resistance
1402‧‧‧ Capacitance
1403‧‧‧reference voltage source
1404‧‧‧ comparator
1501‧‧‧reference voltage source
1502‧‧‧ comparator
1503‧‧‧resistance
1504‧‧ ‧ diode
1505‧‧‧ Pull-up resistor
1601‧‧‧reference voltage source
1602‧‧‧resistance
1603‧‧‧dipole
1604‧‧‧ Comparator
5V, 12V‧‧‧ voltage source
FPO‧‧‧ fault signal
LD1‧‧‧first load
LD2‧‧‧second load
Pth1‧‧‧ first path
Pth2‧‧‧Second path
PS‧‧‧Power start signal
PS'‧‧‧ internal start signal
R1, R2, R3, R4‧‧‧ resistance
S210, S220, S310~S350, S410~S450, S610~S650‧‧‧ steps
Scmp‧‧‧ comparison results
SR‧‧‧ control signal
SR'‧‧‧ internal signal
Sref‧‧‧ control instructions
Sref'‧‧‧ internal signal
Ssb‧‧‧ control signal
Ssb'‧‧‧ internal signal
Vmain‧‧‧main voltage
Vref1, Vref2, Vref3‧‧‧ reference voltage
Vref4‧‧‧ voltage source
Vsb‧‧‧Auxiliary voltage

1 is a schematic diagram of a circuit block of a power supply device in accordance with an embodiment of the present invention. 2 is a flow chart showing a power supply method according to an embodiment of the invention. 3 is a flow chart showing the power supply device of FIG. 1 during a period of switching from standby to normal power supply, in accordance with an embodiment of the present invention. 4 is a flow chart showing the power supply device of FIG. 1 when a failure event occurs during a normal power supply period, in accordance with an embodiment of the present invention. FIG. 5 is a flow chart showing the power supply device of FIG. 1 when a failure event occurs during a normal power supply period in accordance with another embodiment of the present invention. FIG. 6 is a flow chart showing the power supply device of FIG. 1 during a period of switching from a normal power supply to a standby period according to an embodiment of the present invention. FIG. 7 is a block diagram showing the circuit of the switch circuit of FIG. 1 according to an embodiment of the invention. FIG. 8 is a block diagram showing the circuit of the switch circuit of FIG. 1 according to another embodiment of the present invention. FIG. 9 is a block diagram showing the circuit of the switch circuit of FIG. 1 according to still another embodiment of the present invention. FIG. 10 is a block diagram showing the circuit of the control circuit of FIG. 1 according to an embodiment of the invention. FIG. 11 is a block diagram showing the circuit of the output voltage comparison circuit shown in FIG. 10 according to an embodiment of the invention. FIG. 12 is a block diagram showing the circuit of the startup control circuit shown in FIG. 10 according to an embodiment of the invention. FIG. 13 is a block diagram showing the circuit of the startup control circuit shown in FIG. 10 according to another embodiment of the present invention. FIG. 14 is a block diagram showing the circuit of the intermediate circuit shown in FIG. 10 according to an embodiment of the invention. Figure 15 is a block diagram showing the circuit of the switch control circuit of Figure 10 in accordance with an embodiment of the present invention. FIG. 16 is a block diagram showing the circuit of the auxiliary power supply control circuit shown in FIG. 10 according to an embodiment of the invention. FIG. 17 is a block diagram showing the circuit of the auxiliary power supply circuit of FIG. 1 and the level adjustment circuit shown in FIG. 10 according to an embodiment of the invention. FIG. 18 is a block diagram showing the circuit of the auxiliary power supply circuit of FIG. 1 and the level adjusting circuit of FIG. 10 according to another embodiment of the present invention.

Claims (36)

A power supply device includes: a main power supply circuit for generating a main voltage to a first path during a normal power supply to supply a first load, wherein the normal power supply period is an external one of the power supply device An auxiliary power supply circuit is configured to generate an auxiliary voltage to a second path during a standby period to supply power to a second load; a switching circuit having a first end coupled to a second end Connecting the first path and the second path; and a control circuit coupled to a control end of the switch circuit for turning on the switch circuit during the normal power supply to supply the main voltage of the main power circuit to the a first load and the second load, the auxiliary power supply circuit is controlled to stop outputting the auxiliary voltage during the normal power supply, the switching circuit is turned off during the standby period, and the auxiliary power supply circuit is controlled to resume outputting the auxiliary voltage during the standby period Power is supplied to the second load. The power supply device of claim 1, wherein the switch circuit comprises: a resistor having a first end coupled to the first path; and a switch having a first end and a second end Each is coupled to a second end of the resistor and the second path. The power supply device of claim 1, wherein the switch circuit comprises: a switch having a first end coupled to the first path; and a resistor having a first end and a second end Each is coupled to a second end of the switch and the second path. The power supply device of claim 1, wherein the switch circuit comprises: a first resistor having a first end coupled to the first path; a switch having a first end coupled to the a second end of the first resistor; and a second resistor having a first end and a second end respectively coupled to a second end of the switch and the second path. The power supply device of claim 1, wherein the control circuit comprises: a start control circuit having an input end for receiving the power start signal, wherein the start control circuit is correspondingly generated according to the power start signal An internal start signal is coupled to an output of the start control circuit to receive the internal enable signal for generating a first internal signal and a second internal signal; an auxiliary power control circuit coupled Connecting to the intermediate circuit to receive the first internal signal, wherein the auxiliary power control circuit correspondingly generates a first control signal to the auxiliary power supply circuit according to the first internal signal, and the auxiliary power supply circuit is configured according to the first control signal Stopping the output of the auxiliary voltage during the normal power supply; and a switch control circuit coupled to the intermediate circuit to receive the second internal signal, wherein the switch control circuit correspondingly generates a second control signal according to the second internal signal Giving the control terminal of the switch circuit, and the switch circuit is based on the second control signal During the normal power supply is turned on so that the voltage of the main first path to the second transmission path. The power supply device of claim 5, wherein the intermediate circuit further generates a third internal signal according to the internal start signal, and the control circuit further comprises: a level adjustment circuit coupled to the The intermediate circuit receives the third internal signal for controlling the auxiliary power supply circuit to pull the auxiliary voltage from a first rated voltage to a second rated voltage during the standby period according to the third internal signal, and A non-standby period controls the auxiliary power supply circuit to pull the auxiliary voltage from the second rated voltage to the first rated voltage, wherein the first rated voltage is lower than the main voltage. The power supply device of claim 6, wherein the switch control circuit is controlled during the normal power supply after the level adjustment circuit controls the auxiliary power supply circuit to pull the auxiliary voltage to the first rated voltage. Turn on the switch circuit. The power supply device of claim 7, wherein the auxiliary power supply control circuit controls the auxiliary power supply circuit to stop outputting the auxiliary voltage after the switch control circuit turns on the switch circuit during the normal power supply. The power supply device of claim 6, wherein the standby adjustment circuit controls the auxiliary power supply circuit to pull the auxiliary voltage from the first rated voltage to the second rated voltage during the standby period. The auxiliary power control circuit controls the auxiliary power circuit to resume outputting the auxiliary voltage. The power supply device of claim 9, wherein the switch control circuit turns off the switch circuit after the auxiliary power supply control circuit controls the auxiliary power supply circuit to resume outputting the auxiliary voltage during the standby period. The power supply device of claim 6, wherein the level adjusting circuit controls the auxiliary power source when a fault signal of a protection detecting circuit of the power supply device indicates that the main power circuit generates a fault event. The circuit pulls the auxiliary voltage from the first rated voltage to the second rated voltage, and the auxiliary power control circuit controls the auxiliary power circuit to resume outputting the auxiliary voltage. The power supply device of claim 11, wherein when the fault signal indicates that the fault occurs in the main power circuit, the switch control circuit turns off the switch circuit after the auxiliary power circuit resumes outputting the auxiliary voltage. . The power supply device of claim 6, wherein the level adjustment circuit comprises: a switch having a first end coupled to a reference voltage, wherein a control end of the switch is coupled to the intermediate circuit Receiving the third internal signal; and a first resistor having a first end coupled to the second end of the switch, wherein a second end of the first resistor is coupled to the internal of the auxiliary power circuit One of the feedback points. The power supply device of claim 13, wherein the level adjusting circuit further comprises: a diode having an anode coupled to an output of the auxiliary power circuit to receive the auxiliary voltage; and a The second resistor has a first end coupled to the cathode of the diode, and a second end of the second resistor is coupled to the intermediate circuit to receive the third internal signal. The power supply device of claim 13, wherein the level adjustment circuit further comprises: a diode having an anode coupled to the output of the startup control circuit to receive the internal enable signal, wherein A cathode of the diode is coupled to the control end of the switch. The power supply device of claim 13, wherein the level adjustment circuit further comprises: a diode having an anode coupled to the power supply device to receive a fault signal, A cathode of the diode is coupled to the control end of the switch. The power supply device of claim 5, wherein the start-up control circuit comprises: an amplifying circuit having an input receiving the power-on signal, wherein an output of the amplifying circuit is coupled to the intermediate circuit This internal start signal is provided. The power supply device of claim 17, wherein the amplifier circuit comprises: an operational amplifier having a first input for receiving the power enable signal, wherein a second input of the operational amplifier is coupled An output to the operational amplifier and the output of the operational amplifier are coupled to the intermediate circuit to provide the internal enable signal. The power supply device of claim 5, wherein the control circuit further comprises: an output voltage comparison circuit having a first input end and a second input end coupled to the first path and the first a second path for receiving the main voltage and the auxiliary voltage for comparing the main voltage with the auxiliary voltage to obtain a comparison result, wherein the comparison result is provided to the intermediate circuit, and the intermediate circuit is based on the comparison result and the internal startup The signal corresponds to generate the first internal signal and the second internal signal. The power supply device of claim 19, wherein the output voltage comparison circuit comprises: a first voltage dividing circuit coupled to the second path to receive the auxiliary voltage, and at a first ratio The auxiliary voltage is divided to generate a first partial voltage; a second voltage dividing circuit is coupled to the first path to receive the main voltage, and divides the main voltage by a second ratio to generate a second partial pressure; and a comparator having a first input end and a second input end respectively receiving the first divided voltage and the second divided voltage, wherein an output of the comparator generates the comparison result to The intermediate circuit. The power supply device of claim 20, wherein the first ratio is less than the second ratio. The power supply device of claim 20, wherein the output voltage comparison circuit further comprises: a pull-up resistor having a first end and a second end coupled to the output of the comparator and A voltage source. The power supply device of claim 20, wherein the first voltage dividing circuit comprises a first resistor and a second resistor, and the second voltage dividing circuit comprises a third resistor and a fourth resistor. The first resistor has a first end coupled to the second path to receive the auxiliary voltage, and the second resistor has a first end and a second end coupled to a second end of the first resistor And a third voltage resistor having a first end coupled to the first path to receive the main voltage, the fourth resistor having a first end and a second end coupled to the third resistor a second end and the reference voltage. The power supply device of claim 20, wherein the first input of the comparator is further coupled to the output of the startup control circuit to receive the internal enable signal. The power supply device of claim 19, wherein the intermediate circuit comprises: an operational amplifier having a first input coupled to an output of the output voltage comparison circuit to receive the comparison result, wherein a second input end of the operational amplifier is coupled to an output end of the operational amplifier, and the output end of the operational amplifier generates the second internal signal; a first resistor having a first end coupled to the start control The output terminal of the circuit receives the internal enable signal; a diode having an anode coupled to the second end of the first resistor, wherein a cathode of the diode is coupled to the first portion of the operational amplifier An input terminal is coupled to the output terminal of the operational amplifier, wherein the comparison circuit compares the second internal signal with a first reference voltage to obtain a comparison result, and compares the comparison The result is the first internal signal. The power supply device of claim 5, wherein the auxiliary power control circuit comprises: a first comparison circuit having an input coupled to the intermediate circuit to receive the first internal signal, wherein the first Comparing the first internal signal with a first reference voltage to obtain a comparison result; a first resistor having a first end coupled to an output of the first comparison circuit to receive the comparison result; An optically coupled transistor having a first end coupled to a second end of the first resistor; a first optically coupled LED having an anode coupled to a first voltage source, wherein the first The light emitted by the light-coupled light-emitting diode is received by the first light-coupled transistor; a second resistor has a first end coupled to a cathode of the first light-coupled light-emitting diode, wherein the first a second end of the two resistors is coupled to a protection detecting circuit of the power supply device to receive a fault signal; a second light coupling light emitting diode having a cathode coupled to the first optical coupling transistor a second end An anode of the second light-coupled light-emitting diode is coupled to a second voltage source; a second light-coupled transistor has a first end coupled to a third voltage source, wherein the second light The coupling transistor receives the light emitted by the second optical coupling LED; and a second comparison circuit has a first input end and a second input end coupled to the second optical coupling transistor The second terminal and the third voltage source, wherein an output of the second comparison circuit generates the first control signal to the auxiliary power circuit. The power supply device of claim 26, wherein the auxiliary power control circuit further comprises: a first diode having an anode coupled to the output of the start control circuit to receive the internal start signal And a third resistor having a first end coupled to the cathode of the first diode, wherein a second end of the third resistor is coupled to the input end of the first comparison circuit. The power supply device of claim 5, wherein the switch control circuit comprises: a first diode having an anode coupled to the intermediate circuit to receive the second internal signal; a first resistor, a cathode having a first end coupled to the first diode; and a comparison circuit having an input coupled to a second end of the first resistor, wherein the comparing circuit compares the second internal signal A comparison result is obtained with a first reference voltage, and the comparison result is transmitted as the second control signal to the control terminal of the switch circuit. A power supply method includes: generating, by a main power supply circuit, a main voltage to a first path during a normal power supply to supply power to a first load, wherein the normal power supply period is a power supply external to the power supply device The auxiliary signal is configured to generate an auxiliary voltage to a second path during a standby period to supply power to a second load; coupling a first end and a second end of the switch circuit respectively a first path and the second path; during the normal power supply, the switch circuit is turned on by a control circuit to supply the main voltage of the main power circuit to the first load and the second load; Controlling, by the control circuit, the auxiliary power supply circuit to stop outputting the auxiliary voltage; during the standby period, the auxiliary power supply circuit controls the auxiliary power supply circuit to resume outputting the auxiliary voltage to supply power to the second load; and during the standby period The switching circuit is turned off by the control circuit. The power supply method of claim 29, wherein the step of turning on the switch circuit by the control circuit during the normal power supply comprises: controlling, at the control circuit, the auxiliary power circuit to pull the auxiliary voltage to one After the first rated voltage, the switching circuit is turned on by the control circuit. The power supply method of claim 29, wherein the step of controlling, by the control circuit, the auxiliary power supply circuit to stop outputting the auxiliary voltage during the normal power supply comprises: after the control circuit turns on the switch circuit, The control circuit controls the auxiliary power supply circuit to stop outputting the auxiliary voltage. The power supply method according to claim 29, wherein the step of controlling, by the control circuit, the auxiliary power supply circuit to resume outputting the auxiliary voltage during the standby period comprises: controlling the auxiliary power supply circuit to assist the auxiliary circuit After the voltage is pulled from a first rated voltage to a second rated voltage, the auxiliary power circuit is controlled by the control circuit to resume outputting the auxiliary voltage. The power supply method of claim 29, wherein the step of turning off the switch circuit by the control circuit during the standby period comprises: after the control circuit controls the auxiliary power circuit to resume outputting the auxiliary voltage, The control circuit turns off the switching circuit. The power supply method of claim 29, further comprising: controlling, during the standby period, the auxiliary power supply circuit to pull the auxiliary voltage from a first rated voltage to a second rated voltage, Wherein the first rated voltage is lower than the main voltage; and during a non-standby period, the auxiliary circuit is controlled by the control circuit to pull the auxiliary voltage from the second rated voltage to the first rated voltage. The power supply method of claim 29, further comprising: when a fault signal of a protection detecting circuit of the power supply device indicates that a fault event occurs in the main power circuit, the control circuit controls the The auxiliary power supply circuit pulls the auxiliary voltage from a first rated voltage to a second rated voltage, and the control circuit controls the auxiliary power supply circuit to resume outputting the auxiliary voltage. The power supply method of claim 35, further comprising: when the fault signal indicates that the fault occurs in the main power circuit, after the auxiliary power circuit resumes outputting the auxiliary voltage, the control circuit cuts off the Switch circuit.