TWI434163B - Power apparatus - Google Patents

Description

Power supply unit

The present invention relates to a power supply device, and more particularly to a power supply device that is applied to standby energy saving.

Today, the number of electronic devices used in our daily lives is increasing, such as photocopiers, listers, audio and video products, desktop computers and notebook computers. Most of these electronic devices have a problem of high power consumption when they are in a standby state, which not only wastes power, consumes energy and funds, but also has an adverse effect on the environment. For this reason, for most products, there are corresponding regulations to strictly limit the energy consumption during standby.

The power supply device is generally used in conjunction with an electronic device, and the main purpose of the power supply device is to provide a stable and appropriate voltage source for single or multiple electronic devices. Generally, the power supply device converts the input AC mains into the DC power required for the electronic device. As shown in FIG. 1, the conventional power supply device 1 usually has an AC/DC power converter 11 and a DC/DC power converter 12. The AC/DC power converter 11 converts the AC voltage (mains) into a DC voltage, and the DC voltage conversion unit 121 of the DC/DC power converter 12 converts the DC voltage into a plurality of loads 6 in the electronic device. Various DC low voltages.

Under the structure of the conventional power supply device 1, in the standby state, the AC/DC power converter 11 and the DC/DC power converter 12 have conversion loss, and the AC/DC power converter 11 can directly generate standby state. The power required for the lower load can turn off the unnecessary DC/DC power converter 12 to save conversion loss and improve the performance of the overall power supply unit 1, thereby demonstrating the effectiveness of energy saving.

It is an object of the present invention to provide a power supply device capable of reducing output power during standby to reduce unnecessary line loss and complying with energy saving regulations.

To achieve the above object, a power supply device according to the present invention is used to cooperate with an electronic device including a control unit. The power supply device includes a power supply module, a feedback control unit, a voltage setting unit, and an electrical isolation unit. The power supply module has a voltage output terminal and a voltage adjustment terminal, and the voltage output terminal provides an output voltage. The feedback control unit is coupled to the voltage output terminal. The voltage setting unit is coupled to the control unit. The electrical isolation unit has an input end and an output end, the input end is coupled to the feedback control unit and the voltage setting unit, the output end is coupled to the voltage adjustment end, and the input end has an input current. When the electronic device enters the standby state, the control unit controls the voltage setting unit to increase the input current, and lowers the voltage of the voltage regulating terminal, so that the power supply device adjusts the output voltage.

In an embodiment of the invention, the power supply module has a power conversion unit and a pulse width modulation control unit, and the power conversion unit is coupled to the pulse width modulation control unit, and the output end of the power conversion unit is a voltage output end, and the pulse width is The input end of the modulation control unit is a voltage adjustment end, and the pulse width modulation control unit adjusts the output voltage of the power conversion unit according to the voltage of the voltage adjustment terminal.

In an embodiment of the invention, the electrical isolation unit is an optical coupler.

In an embodiment of the invention, the voltage setting unit comprises a register diode.

In an embodiment of the invention, the voltage setting unit further includes a voltage dividing circuit and a voltage regulator, and the voltage dividing circuit provides a voltage to the voltage regulator.

As described above, when the power supply device of the present invention is in a standby state with the electronic device of the application, the control unit outputs a control signal to the voltage setting unit to reduce the output voltage provided by the power supply module, so that the power supply module The output voltage is reduced to the voltage required for standby, and can be directly supplied to the required load. The power supply device disclosed in the present invention does not need to pass a DC converter to convert the DC voltage to the voltage required for standby of the electronic device in a standby state, so that unnecessary line loss can be reduced, and the power line can be effectively and quickly converted into The DC voltage required for standby meets the requirements of energy conservation regulations.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power supply device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

Please refer to FIG. 2, which is a schematic diagram of a power supply device of the present invention. The power supply device 2 is used to cooperate with an electronic device 3. In the embodiment, the power supply device 2 is an external device connected to the electronic device 3 through a connecting line or a connector. In other embodiments, the power device 2 can also be integrated in the power device 2 The inside of the electronic device 3 is not limited by the present invention. The electronic device 3 described above includes a control unit 31 and a system load (not shown). In the preferred embodiment of the present invention, the electronic device 3 can be an office device, a desktop computer, a video recorder, a notebook computer, or a digital computer box. The input power of the power device 2 can be an AC power source of the utility power, for example. : AC power can be AC voltage 90V to 264V. The power supply device 2 includes, for example, a power supply module 21, an electrical isolation unit 22, a feedback control unit 23, and a voltage setting unit 24.

The power supply module 21 has a voltage output terminal 211b and a voltage adjustment terminal 212a. The power supply module 21 further includes a power conversion unit 211 and a pulse width modulation controller (PWM controller) 212. The power conversion unit 211 is coupled to the pulse width modulation control unit 212. One of the input ends of the pulse width modulation control unit 212 is a voltage adjustment terminal 212a, that is, the voltage adjustment terminal 212a of the power supply module 21. One of the output terminals of the power conversion unit 211 is a voltage output terminal 211b, that is, a voltage output terminal 211b of the power supply module 21 described above. The power conversion unit 211 receives the input voltage V1 and provides an output voltage V2 at the voltage output terminal 211b.

The electrical isolation unit 22 has an input 22a and an output 22b, wherein an input current is present at the input 22a of the electrical isolation unit 22. The input end 22a of the electrical isolation unit 22 is coupled to the feedback control unit 23 and the voltage setting unit 24. The output end 22b of the electrical isolation unit 22 is coupled to the voltage adjustment terminal 212a of the pulse width modulation control unit 212.

The feedback control unit 23 is coupled to the voltage output end 211b of the power supply module 21 and the input end 22a of the electrical isolation unit 22, respectively.

The voltage setting unit 24 is coupled to the input end 22a of the electrical isolation unit 22, the feedback control unit 23, and the control unit 31 of the electronic device 3, respectively. In the present embodiment, when the electronic device 3 is normally operated, the control unit 31 controls the operation of the voltage setting unit 24 without affecting the input current of the input terminal 22a of the electrical isolation unit 22.

When the electronic device 3 enters a standby state or a power saving mode, the control unit 31 controls the voltage setting unit 24 to increase the input current of the input terminal 22a of the electrical isolation unit 22 to reduce the voltage adjustment end of the pulse width modulation control unit 212. The voltage of the 212a, the pulse width modulation control unit 212 adjusts the output voltage V2 of the power conversion unit 211 according to the voltage of the voltage adjustment terminal 212a to lower the voltage required for the voltage of the electronic device 3 to the standby state or the power saving mode.

Please refer to FIG. 2 and FIG. 3 simultaneously, wherein FIG. 3 is a partial circuit diagram of a power supply device according to a preferred embodiment of the present invention. Hereinafter, the structure and operation of the power supply module 21, the electrical isolation unit 22, the feedback control unit 23, the voltage setting unit 24, and the control unit 3 of the power supply device 2 of the present embodiment will be described in detail. In addition, the aspect shown in FIG. 3 is an auxiliary description and is not intended to limit the present invention.

The power conversion unit 211 of the power supply module 21 rectifies the AC input voltage V1 to a DC voltage, and provides an output voltage V2 at the voltage output terminal 211b. When the electronic device 3 is in an operating state, the output voltage V2 of the present embodiment is exemplified by 12V.

The pulse width modulation control unit 212 outputs a switching control signal S1 to control the operation of the power conversion unit 211. In this embodiment, the switching control signal S1 is used to control the switching period of a switching element (not shown) of the power conversion unit 211, and indirectly control the output voltage V2 and/or current of the power conversion unit 211.

In practical application, the power conversion unit 211 can also have two switching elements according to the actual design of the internal rectification conversion circuit. At this time, the switching control signal S1 is a set of pulse width modulation signals, because of the bridge rectifier, the two switching elements At the same time, the conduction will cause the power supply to be short-circuited, causing serious damage to the circuit components. Therefore, when one of the pulse width modulation signals is the conduction communication number, the other pulse width modulation signal is the cutoff signal, that is, the conduction of the two switching elements. The states are switched in a complementary manner to avoid short circuiting of the circuit when simultaneously turned on and to obtain a continuous output current.

In this embodiment, the electrical isolation unit 22 is a photo coupler. The optical coupler mainly provides the material mainly composed of the transistor as the protection electronic component, and can completely isolate the two sides of the electrical, and the electrical isolation can prevent the noise generated in the circuit from being transmitted to another circuit and conform to the security check. Regulations.

The input end 22a of the electrical isolation unit 22 of the present embodiment has a light emitter. In this embodiment, for example, a light emitting diode is used to convert the input electrical signal into an optical signal; the output end 22b has a light. In this embodiment, the detector is, for example, a photoelectric crystal for receiving the optical signal from the optical transmitter and converting it into an electrical signal output. Therefore, the input terminal 22a and the output terminal 22b of the electrical isolation unit 22 have no direct electrical power. Sexual connection, and can be used for unidirectional signal transmission, to achieve electrical isolation and anti-interference of the circuits on both sides of input 22a and output 22b. In practical applications, the photodetector can also be a Light Darlington or a Silicon Controlled Rectifier, which is not intended to limit the present invention.

In this embodiment, the current flowing through the light-emitting diode of the optical coupler is 0.5 mA, and the voltage drop of the light-emitting diode of the optical coupler is 1.1 V, that is, the input voltage of the electrical isolation unit 22. The difference is 1.1V.

In addition, in actual use, the electrical isolation unit 22 can also be a transformer, which is not intended to limit the present invention.

The feedback control unit 23 receives the output voltage V2 of the power supply module 21 and provides a feedback signal S3 to the power supply module 21. The feedback control unit 23 has a plurality of resistors R1 to R6, a plurality of capacitors C1 to C2, and a voltage regulator controller T. The resistors R1 to R6 and the capacitors C1 to C2 are coupled to the voltage regulator controller T.

The voltage setting unit 24 has a Zener diode Z. The Zener diode Z has a breakdown voltage. When the voltage setting unit 24 and the control unit 3 are turned on, the gate diode Z in the voltage setting unit 24 starts to operate, so that the terminal voltage of the diode Z is detected. Maintained at the breakdown voltage. The breakdown voltage of the Zener diode Z is determined according to the doping concentration of the Zener diode Z. According to the general semiconductor diode Z, the breakdown voltage is about 6V or less. In this embodiment, the breakdown voltage of the Zener diode Z is exemplified by 3.3V. The embodiment of the voltage setting unit 24 of the present embodiment is illustrative and not intended to limit the present invention.

The control unit 31 has a control element 311 which can be an integrated circuit component. In addition, the control unit 31 of the embodiment further has a switching element 312, and the switching element 312 can be a transistor.

In this embodiment, the switching element 312 is coupled to the control element 311, the Zener diode Z, and a ground terminal G. The control component 311 outputs a control signal S2 to the switching component 312 to control the switching of the switching component 312. The control component 311 directly controls the conduction of the Zener diode Z or controls the switching component 312 by the control component 311. The switch indirectly controls the conduction of the Zener diode Z.

The control element 311 of the embodiment controls the switch of the switching element 312. When the control element 311 outputs an open control signal S2 to the switching element 312, one of the switching elements 312 can be turned on, that is, with the second The circuit of the polar body Z is also turned on, and the Zener diode Z is connected to the ground terminal G. When the Zener diode Z is turned on, the terminal voltage of the Zener diode Z is maintained at the breakdown voltage.

Referring to FIG. 3, when the electronic device is in a normal operating state, the switching element 312 of the control unit 31 is in a turn-off state, so that the voltage setting unit 24 connected to the control unit 31 cannot be connected to the ground terminal G. The circuit having one of the voltage setting units 24 is rendered incapable of being turned on, and the Zener diode Z is rendered inoperable.

In this embodiment, the resistor R1 is 470 ohms, the resistor R2 is 1.5K ohms, and the resistor R3 is 0 ohms. For example, the current I1 flowing through the resistor R2 is the voltage drop of the light-emitting diode divided by the resistance R2 of 1.5K. , that is, I1 is 1.1/1.5=0.73 mA. The current I2 flowing through the resistor R1 is the current I1 flowing through the resistor R2 plus the current flowing through the light-emitting diode, that is, I2 is 0.73 mA + 0.5 mA = 1.23 mA. The voltage of the node K is V2 minus the voltage across the resistor R1, that is, the voltage of the node K is 12-(1.23m*470)=11.4219V. The voltage of the node L is the voltage of the node K minus the voltage drop of the light-emitting diode, and the voltage of the node L is 10.3219V.

However, when the electronic device is in the standby state or the power saving mode, the control unit 31 outputs the turned-on control signal S2 to the switching element 312, and one of the switching elements 312 can be turned on, that is, has the Zener diode Z. The line is also turned on, and the Zener diode Z is connected to the ground terminal G, and the terminal voltage of the Zener diode Z is maintained at a breakdown voltage of 3.3V, and the voltage of the node L is also 3.3V.

The voltage of the node L instantaneously changes from the normal operating state of 10.3219V to the standby state of 3.3V, so that the current of the input terminal (node L, K) of the electrical isolation unit 22 becomes instantaneously large, and the light-emitting diode of the optical coupler is opposite. As the experience becomes brighter, the current flowing through the output of the electrical isolation unit 22 becomes relatively larger, that is, the current flowing through the transistor of the optical coupler becomes relatively larger.

Referring to FIG. 2 at the same time, the voltage adjustment terminal 212a is internally connected to the pulse width modulation control unit 212 as an input terminal of a differential amplifier, which is regarded as a constant current source architecture. In the constant current architecture, when the current of the output terminal 22b of the electrical isolation unit 22 becomes larger, the voltage of the voltage adjustment terminal 212a of the pulse width modulation control unit 212 becomes smaller, thereby lowering the output voltage of the power supply module 21. V2.

In addition, since the electronic device transitions to the standby state, the voltage of the node K and the output voltage V2 decrease accordingly, so that the voltage received by the feedback control unit 23 is greatly reduced, which cannot generate sufficient voltage to provide the feedback control unit 23 Some of the electronic components are actuated, wherein the electronic components are the resistors R1 R R6, the capacitors C1 C C2 and the voltage regulator controller T as shown in FIG. 3 . The voltage regulator controller T has a reference voltage, which is exemplified by 1.24V.

As described above, when the electronic device is in the standby state, the control unit 31 of the power supply device 2 controls the conduction of the Zener diode Z of the voltage setting unit 24, and the output voltage V2 provided by the power supply module 21 is less than the feedback control. The operating voltage of unit 23 is such that some of the electronic components of feedback control unit 23 are inoperable. In addition, when the electronic device is switched from the normal operating state to the standby state, since the current of the input terminal 22a of the electrical isolation unit 22 is instantaneously increased, the current of the output terminal 22b of the electrical isolation unit 22 is relatively large, and is electrically isolated. The voltage of the voltage regulating terminal 212a of the pulse width modulation control unit 212 coupled to the output terminal 22b of the unit 22 will become smaller, thereby causing the output voltage V2 of the power conversion unit 211 to be lowered to the voltage required in the standby state.

Please refer to FIG. 4, wherein FIG. 4 is a partial circuit diagram of another aspect of the power supply device of the present invention. The power supply device 2a of the present embodiment is different from the power supply device 2 of the above embodiment in that the voltage setting unit 24a of the power supply device 2a has a voltage regulator U and a voltage dividing circuit 241, and the voltage dividing circuit 241 has a plurality of resistors. R7-R9, the resistors R7-R9 are connected in series with the voltage regulator U, and the voltage dividing circuit 241 provides a partial voltage to the voltage regulator U. The aspect of the voltage dividing circuit 241 of the present embodiment is an example and is not intended to limit the present invention. The voltage dividing circuit 241 may have components such as capacitors, inductors, and the like that can be used for voltage division depending on the design. In addition, the voltage setting unit 24a is connected to the control element 311 of the control unit 31. When the electronic device is in a normal operating state, the control element 311 provides a high impedance signal to the voltage setting unit 24a. When the electronic device is in the standby state, the control component 311 of the control unit 31 provides a low impedance signal to the voltage setting unit 24a to cause the voltage regulator U to operate, wherein the low impedance signal is a pilot communication number. After the voltage regulator U is actuated, the voltage across the voltage regulator U is the set voltage. Further, after the output voltage V2 is divided by the voltage dividing circuit 241, the voltage of the node L is approximately equal to the set voltage. As the current flowing through the input terminal 22a of the electrical isolation unit 22 increases, the current of the output terminal 22b of the electrical isolation unit 22 becomes instantaneously large, causing the voltage of the voltage adjustment terminal 212a of the pulse width modulation control unit 212 to be relatively small. Therefore, the output voltage V2 of the power conversion unit 211 is also lowered. In addition, since the voltage of the node K and the output voltage V2 are lowered, the voltage received by the feedback control unit 23 is greatly reduced, and it is unable to generate a sufficient voltage to provide a part of the electronic component actuation of the feedback control unit 23.

As described above, when the electronic device is in the standby state, the control unit 31 of the power supply device 2a controls the operation of the voltage regulator U of the voltage setting unit 24a, and the output voltage V2 provided by the power supply module 21 is smaller than the feedback control unit 23 The actuation voltage causes some of the electronic components of the feedback control unit 23 to be inoperable. In addition, when the electronic device is switched from the normal operating state to the standby state, the current flowing through the input terminal 22a of the electrical isolation unit 22 is increased, so that the current of the output terminal 22b of the electrical isolation unit 22 is instantaneously increased, causing a pulse width adjustment. The voltage of the voltage regulating terminal 212a of the variable control unit 212 will become smaller, thereby causing the output voltage V2 of the power conversion unit 211 to be lowered to the voltage required in the standby state.

In summary, the power supply device of the preferred embodiment of the present invention is configured to output a control signal to the voltage setting unit and the voltage regulator of the control voltage setting unit when the electronic device in cooperation with the application is in a power saving state or a standby state. Actuating or igniting the conduction of the diode causes the output voltage provided by the power supply module to decrease. In addition, since the current at the input end of the electrical isolation unit increases, the current at the output end of the electrical isolation unit becomes instantaneously large, causing the voltage of the voltage adjustment terminal of the pulse width modulation control unit to become smaller, thereby causing the output voltage of the power conversion unit to decrease to The voltage required in the standby state can be directly supplied to the required load. The power supply device disclosed in the present invention does not need to pass a DC converter to convert the DC voltage to the voltage required for standby of the electronic device in a standby state, so that unnecessary line loss can be reduced, and the power line can be effectively and quickly converted into The DC voltage required for standby and meets the requirements of energy saving regulations.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 2, 2a‧‧‧ power supply unit

11‧‧‧AC/DC Power Converter

12‧‧‧DC/DC Power Converter

121‧‧‧DC conversion unit

21‧‧‧Power supply module

211‧‧‧Power Conversion Unit

211b‧‧‧voltage output

212‧‧‧ pulse width modulation control unit

212a‧‧‧voltage adjustment terminal

22‧‧‧Electrical isolation unit

22a‧‧‧Input of electrical isolation unit

22b‧‧‧output of electrical isolation unit

23‧‧‧Responsible control unit

24, 24a‧‧‧Voltage setting unit

241‧‧‧voltage circuit

3‧‧‧Electronic devices

31‧‧‧Control unit

311‧‧‧Control elements

312‧‧‧Switching elements

6‧‧‧ load

C1~C2‧‧‧ capacitor

G‧‧‧ Grounding terminal

I1, I2‧‧‧ current

K~M. . . node

R1 ~ R9. . . resistance

S1. . . Switching control signal

S2. . . Control signal

S3. . . Feedback signal

T. . . Voltage regulator controller

V1. . . Input voltage

V2. . . The output voltage

Z. . . Jenus diode

U. . . Voltage regulator

1 is a schematic diagram of a conventional power supply device;

2 is a schematic view of a power supply device of the present invention;

3 is a partial circuit diagram of a power supply device according to a preferred embodiment of the present invention;

4 is a partial circuit diagram showing another aspect of the power supply device of the present invention.

2. . . Power supply unit

twenty one. . . Power supply module

211. . . Power conversion unit

211b. . . Voltage output

212. . . Pulse width modulation control unit

212a. . . Voltage adjustment terminal

twenty two. . . Electrical isolation unit

22a. . . Input of electrical isolation unit

22b. . . Output of electrical isolation unit

twenty three. . . Feedback control unit

twenty four. . . Voltage setting unit

3. . . Electronic device

31. . . control unit

S1. . . Switching control signal

S3. . . Feedback signal

V1. . . Input voltage

V2. . . The output voltage

Claims (5)

A power supply device for supporting an electronic device, the electronic device comprising a control unit, the power supply device comprising: a power supply module having a voltage output end and a voltage adjustment end, the voltage output end providing an output voltage; a feedback control unit coupled to the voltage output terminal; a voltage setting unit coupled to the control unit; and an electrical isolation unit having an input end and an output end coupled to the feedback control unit The voltage setting unit is coupled to the voltage regulating end, and the input terminal has an input current, wherein when the electronic device enters a standby state, the control unit controls the voltage setting unit to increase the input current, thereby reducing A voltage of the voltage regulating terminal causes the power supply device to adjust the output voltage. The power supply device of claim 1, wherein the power supply module has a power conversion unit and a pulse width modulation control unit, and the power conversion unit is coupled to the pulse width modulation control unit, and the power conversion One output end of the unit is the voltage output end, and one input end of the pulse width modulation control unit is the voltage adjustment end, and the pulse width modulation control unit adjusts the power conversion unit according to the voltage of the voltage adjustment end The output voltage. The power supply device of claim 1, wherein the electrical isolation unit is an optical coupler. The power supply device of claim 1, wherein the voltage setting unit comprises a register diode. The power supply device of claim 1, wherein the voltage setting unit further comprises a voltage dividing circuit and a voltage regulator, wherein the voltage dividing circuit supplies a voltage to the voltage regulator.