TWI571028B - Dual-Input Power Supply And Redundant Method Thereof - Google Patents

Description

Dual input power supply and backup method thereof

The invention provides a power supply, in particular to a dual input power supply and a backup method thereof.

Many electronic devices, computing systems, etc., now use power supplies to provide stable power, allowing electronic devices or computing systems to operate for a long time, and avoiding the inability of electronic devices or computing systems to operate due to unstable mains sources. Or damaged.

The power supply between the squares is mostly a single input power supply, which is usually connected to the commercial power to convert the AC power of the commercial power into a stable DC power supply for the electronic device to operate. In addition, there is also a dual-input dual-output power supply. The input terminals are respectively input AC power of the same voltage or input AC and DC current respectively. Therefore, the dual-input power supply has dual output ports, and each output corresponds to each output. The power supply at the input end outputs the corresponding output power separately. For example, when the input and output of the dual-input dual-output power supply are the same as the AC power supply, the output terminals respectively output the same power; if the input terminals are respectively an alternating current and a continuous current, an output terminal outputs an output power corresponding to the alternating current output, and An output corresponds to a direct current output of another output power.

Therefore, the dual input dual output power supply needs to be separately integrated for each input power supply. After the current and the voltage change, the output power is output to the electronic device at each output end, that is, the dual input dual output power supply system is respectively corresponding from one input end to one output end, thereby causing the volume of the dual input dual output power supply. It is huge and contradicts the current technological development of miniaturization or miniaturization. In view of this, it is necessary to propose an improvement scheme to solve the aforementioned problems.

In one embodiment, a dual input power supply includes: a first power factor correction circuit, a second power factor correction circuit, and an output circuit. The output circuit is coupled to the first power factor correction circuit and the second power factor correction circuit, respectively. The first power factor correction circuit receives the first alternating current power source and generates a first direct current voltage according to the first alternating current power source. The first power factor correction circuit is configured to provide a first target voltage, and when the first AC power source is normal, the first DC voltage is the first target voltage. The second power factor correction circuit receives the second alternating current power source different from the first alternating current power source and generates the second direct current voltage according to the second alternating current power source. The second power factor correction circuit is configured to provide a second target voltage that is less than the first target voltage, and when the second AC power source is normal, the second DC voltage is the second target voltage. The output circuit provides an output voltage based on the first DC voltage or the second DC voltage. Wherein, when the first DC voltage is normal, the output circuit provides an output voltage based on the first DC voltage. The output circuit provides an output voltage based on the second DC voltage when the first DC voltage is less than the second DC voltage due to the abnormality of the first AC power source.

In an embodiment, a backup method for a dual input power supply includes: using a first power factor correction circuit to output a first DC voltage to an output circuit according to a first AC power source, and using a second power factor correction circuit The second AC power source outputs a second DC voltage to the output circuit, and the output circuit outputs the output according to the first DC voltage or the second DC voltage. Voltage. The first power factor correction circuit is configured to provide a first target voltage, and when the first AC power source is normally supplied, the first DC voltage is the first target voltage. The second power factor correction circuit is configured to provide a second target voltage that is less than the first target voltage, and when the second AC power source is normally supplied, the second DC voltage is the second target voltage. Wherein, when the first DC voltage is normally supplied, the output circuit provides an output voltage based on the first DC voltage, and when the first DC voltage is less than the second DC voltage due to the abnormality of the first AC power source, the output circuit is provided based on the second DC voltage The output voltage.

In summary, the dual input power supply and the backup method thereof according to the present invention can provide an output voltage at the output of the first power factor correction circuit when the first AC power source is normal, and when the first AC power source is abnormal, The output of the second power factor correction circuit is provided to provide an output voltage, thereby achieving a reduction in hardware cost and an increase in efficiency in the case of supporting dual input power.

10‧‧‧First power factor correction circuit

11‧‧‧First rectifier circuit

12‧‧‧First voltage regulation circuit

13‧‧‧First Control Unit

14‧‧‧First feedback circuit

141‧‧‧First feedback circuit

142‧‧‧First feedback circuit

143‧‧‧First feedback circuit

15‧‧‧Selection unit

151‧‧‧Selection switch

152‧‧‧Selection switch

153‧‧‧Selection switch

20‧‧‧Second power factor correction circuit

21‧‧‧Second rectifier circuit

22‧‧‧Second voltage regulating circuit

23‧‧‧Second Control Unit

24‧‧‧Second feedback circuit

241‧‧‧Second feedback circuit

242‧‧‧Second feedback circuit

243‧‧‧Second feedback circuit

25‧‧‧Selection unit

251‧‧‧Selection switch

252‧‧‧Selection switch

253‧‧‧Selection switch

30‧‧‧Output circuit

31‧‧‧First Diode

32‧‧‧second diode

33‧‧‧ storage capacitor

40‧‧‧DC to DC converter

50‧‧‧Load circuit

AC1‧‧‧First AC power supply

AC2‧‧‧second AC power supply

DC1‧‧‧ first DC voltage

DC2‧‧‧second DC voltage

S01‧‧ ‧ using the first power factor correction circuit to generate a first DC voltage according to the first AC power source to the output circuit, wherein the first power factor correction circuit is configured to provide a first target voltage, and when the first AC power source is normally supplied, The first DC voltage is the first target voltage

S02‧‧‧ generating a second DC voltage to the output circuit according to the second AC power source by using the second power factor correction circuit, wherein the second power factor correction circuit is configured to provide a second target voltage less than the first target voltage, and when the second When the AC power is normally supplied, the second DC voltage is the second target voltage.

S03‧‧‧The first DC voltage is less than the second DC voltage?

S031‧‧‧ Is the first DC voltage lower than the second DC voltage?

S032‧‧‧ Output circuit based on the first DC voltage output output voltage

S033‧‧‧ output circuit based on the second DC voltage output output voltage

S04‧‧‧The load voltage is generated by the DC-to-DC converter according to the output voltage

[Fig. 1] is a schematic structural view of an embodiment of a dual input power supply of the present invention.

[Fig. 2] is a flow chart showing an embodiment of a backup method of the dual input power supply of the present invention.

[Fig. 3] is a detailed architectural diagram of an embodiment of the first power factor correction circuit in Figs. 1 and 2.

[Fig. 4] is a detailed architectural diagram of another embodiment of the first power factor correction circuit in Figs. 1 and 2.

[Fig. 5] is an architecture of still another embodiment of the first power factor correction circuit in Figs. 1 and 2. schematic diagram.

[Fig. 6] is a detailed architectural diagram of an embodiment of the second power factor correction circuit in Figs. 1 and 2.

[Fig. 7] is a detailed architectural diagram of another embodiment of the second power factor correction circuit in Figs. 1 and 2.

[Fig. 8] is a schematic structural view of still another embodiment of the second power factor correction circuit in Figs. 1 and 2.

[Fig. 9] is a detailed architectural diagram of an embodiment of the output circuit of Figs. 1 and 2.

[Fig. 10] is a schematic structural view of another embodiment of the dual input power supply of the present invention.

1 is a block diagram showing an embodiment of a dual input power supply of the present invention. 2 is a flow chart of an embodiment of a backup method for the dual input power supply of the present invention. Referring to FIGS. 1 and 2, the dual input power supply includes a first power factor correction circuit 10, a second power factor correction circuit 20, an output circuit 30, and a DC to DC converter 40. An input of the output circuit 30 is coupled to an output of a first power factor correction (PFC) circuit 10 and an output of a second power factor correction circuit 20. The output of the output circuit 30 is coupled to the input of a DC to DC converter 40, and the output of the DC to DC converter 40 is coupled to a subsequent stage circuit (e.g., a load circuit). The input of the first power factor correction circuit 10 is connected to the first power supply terminal, and the input of the second power factor correction circuit 20 is connected to the second power supply terminal. The first power supply terminal provides a first alternating current power source AC1, and the second power supply terminal provides a second alternating current power source AC2.

The first power factor correction circuit 10 receives the first AC power source from the outside AC1, and the first power factor correction circuit 10 generates a first DC voltage DC1 according to the first AC power source AC1 (step S01). The first power factor correction circuit 10 is configured to provide a first target voltage. In other words, when the first AC power source AC1 is normally supplied, the first DC voltage DC1 output by the first power factor correction circuit 10 can be stabilized at the first target voltage.

The second power factor correction circuit 20 receives the second AC power source AC2 from the outside, and the second power factor correction circuit 20 generates the second DC voltage DC2 in accordance with the second AC power source AC2 (step S02). The first AC power source AC1 is different from the second AC power source AC2. The second power factor correction circuit 20 is configured to provide a second target voltage, and the second target voltage is less than the first target voltage (eg, the first target voltage is 400V, and the second target voltage is 390V, but The invention is not limited to this). In other words, when the second AC power source AC2 is normally supplied, the second DC voltage DC2 output by the second power factor correction circuit 20 can be stabilized at the second target voltage.

The output circuit 30 outputs an output voltage based on the first DC voltage DC1 or the second DC voltage DC2 (step S03).

The DC-to-DC converter 40 receives the output voltage and generates a load voltage in accordance with the output voltage (step S04).

When the first AC power source AC1 is normally supplied, the first power factor correction circuit 10 outputs the first DC voltage DC1 stabilized at the first target voltage to the output circuit 30 based on the first AC power source AC1, and the first DC voltage DC1 is greater than The second DC voltage DC2 (step S031). When the first DC voltage DC1 is normally supplied (ie, the first DC voltage DC1 is stabilized at the first target voltage), the output circuit 30 outputs an output voltage based on the first DC voltage DC1 (step S032).

When the first AC power source AC1 is abnormal, the first DC voltage DC1 output by the first power factor correction circuit 10 may be lower than the first target voltage, and the first DC voltage DC1 may be smaller than the second DC voltage DC2 (Step S031). When the first DC voltage DC1 is smaller than the second DC voltage DC2 due to the abnormality of the first AC power source AC1, the output circuit 30 outputs the output voltage based on the second DC voltage DC2 (step S033). In other words, the dual input power supply can stably supply the output voltage with the second AC power source AC2 as a backup power source when the AC power source AC1 is abnormal.

Figure 3 is a detailed architectural diagram of an embodiment of the power factor correction circuit of Figures 1 and 2. In some embodiments, referring to FIG. 3, the first power factor correction circuit 10 includes a first rectifier circuit 11, a first voltage regulation circuit 12, and a first control unit 13. The input of the first voltage regulating circuit 12 is connected to the first rectifying circuit 11, the output of the first voltage regulating circuit 12 is connected to the output circuit 30, and the control end of the first voltage regulating circuit 12 is connected to the first control unit 13.

The first rectifying circuit 11 receives the first alternating current power source AC1, and the first rectifying circuit 11 outputs the first rectified voltage according to the first alternating current power source AC1. In other words, the first rectifying circuit 11 rectifies the first alternating current power source AC1 (converts alternating current into direct current) to generate a first rectified voltage.

The first control unit 13 generates a first power signal corresponding to the first target voltage. In other words, the first control unit 13 controls the first voltage adjustment circuit 12 to output the first DC voltage DC1 corresponding to the first target voltage with the first power signal, that is, the magnitude of the first target voltage may correspond to the setting of the first power signal. Change to change the size of the first DC voltage DC1.

The first voltage regulating circuit 12 provides a first DC voltage DC1 that matches the first target voltage under the control of the first power signal. The first voltage regulating circuit 12 receives the first rectified voltage from the first rectifying circuit 11, and adjusts the first rectified voltage to the first direct current voltage DC1 under the control of the first power signal. That is, the first voltage regulating circuit 12 performs voltage adjustment under the control of the first power signal to generate a first DC voltage DC1 having a first target voltage.

Fig. 4 is a detailed architectural diagram of another embodiment of the first power factor correction circuit 10 in Figs. 1 and 2. In some embodiments, referring to FIG. 4, in addition to the first rectifier circuit 11, the first voltage regulation circuit 12, and the first control unit 13, the first power factor correction circuit 10 further includes a first feedback circuit 14. The first feedback circuit 14 is connected between the output of the first voltage regulating circuit 12 and the first control unit 13. The first feedback circuit 14 generates a first feedback signal based on the first DC voltage DC1. The first control unit 13 receives the first feedback signal and generates a first power signal corresponding to the first target voltage according to the first feedback signal. The first voltage regulating circuit 12 adjusts the magnitude of the first DC voltage DC1 in response to the first power signal to output a first DC voltage DC1 having a stable voltage value.

In some embodiments, the first power factor correction circuit 10 can have an adjustable first target voltage under the principle that the second target voltage is less than the first target voltage.

Fig. 5 is a block diagram showing another embodiment of the first power factor correction circuit 10 in Figs. 1 and 2. In some embodiments, referring to FIG. 5, in addition to the first rectifier circuit 11, the first voltage regulator circuit 12, and the first control unit 13, the first power factor correction circuit 10 further includes a plurality of first feedback circuits 141, 142, 143 and selection unit 15. The selection unit 15 is connected to the output of the first voltage regulating circuit 12, and each of the first feedback circuits 141, 142, 143 is connected between the first control unit 13 and the selection unit 15. First feedback circuit 141, 142, 143 Corresponding to the first target voltage of different voltage values.

The selection unit 15 includes a plurality of selection switches 151, 152, 153. The selection switch 151 is connected between the output end of the first voltage regulating circuit 12 and the first feedback circuit 141, the selection switch 152 is connected between the output end of the first voltage regulating circuit 12 and the first feedback circuit 142, and is selected The switch 153 is connected between the output of the first voltage regulating circuit 12 and the first feedback circuit 143. The selection switches 151, 152, 153 are controlled to be turned on or off by a selection signal.

For example, the first feedback circuit 141 corresponds to the first target voltage of the voltage value V _A , the first feedback circuit 142 corresponds to the first target voltage of the voltage value V _B , and the first feedback circuit 143 corresponds to the voltage value V respectively. The first target voltage of _C. The voltage value V _A , the voltage value V _B and the voltage value V _C are different values (for example, the voltage value V _A , the voltage value V _B and the voltage value V _C are 400V, 395V and 390V, respectively, but the invention is not limited thereto) ). Under the control of the selection signal, one of the selection switches 151, 152, 153 is turned on, while the rest is non-conducting.

When the first target voltage of the signal selection voltage value V _B is selected, the selection switch 152 is turned on in response to the selection signal, and the selection switch 151 and the selection switch 153 form an open circuit in response to the selection signal, thereby turning on the first feedback circuit 142 to The output of the first voltage regulating circuit 12. At this time, the first feedback circuit 142 that is turned on generates a first feedback signal according to the first DC voltage DC1, and transmits the generated first feedback signal to the first control unit 13 to cause the first control unit 13 to A feedback signal generates a first power signal corresponding to the voltage value V _B , and the first power signal enables the first voltage regulation circuit 12 to adjust the first rectified voltage to the first DC voltage DC1 (ie, the first output will be output) The DC voltage DC1 is stabilized at the voltage value V _B ), and the first DC voltage DC1 is output to the output circuit 30. Thereby, the first power factor correction circuit 10 can be provided with the first DC voltage DC1 stabilized at different voltage values, so that the required voltage level can be selected according to actual needs.

Here, the selection unit 15 is only turned on by the selection switch 151, 152 or 153 at the same time, but the invention is not limited thereto. In other embodiments, the selection unit 15 can be turned on according to the selection switches 151, 152, 153. The combination mode (for example, the selection switches 151, 152 are turned on, the selection switch 153 is not turned on; or the selection switches 151, 153 are turned on, the selection switch 152 is not turned on) and the different first feedback signals are provided for the first control unit 13 to generate a corresponding A first power signal of a different first target voltage.

Figure 6 is a detailed architectural diagram of an embodiment of the second power factor correction circuit 20 in Figures 1 and 2. In some embodiments, referring to FIG. 6, the second power factor correction circuit 20 includes a second rectifier circuit 21, a second voltage regulation circuit 22, and a second control unit 23. The input of the second voltage regulating circuit 22 is connected to the second rectifier circuit 21, the output of the second voltage regulating circuit 22 is connected to the output circuit 30, and the control terminal of the second voltage regulating circuit 22 is connected to the second control unit 23.

The second rectifying circuit 21 receives the second alternating current power source AC2, and the second rectifying circuit 21 outputs the second rectified voltage according to the second alternating current power source AC2. In other words, the second AC power source AC2 rectifies the second AC power source AC2 (converts AC power to DC power) to generate a second rectified voltage.

The second control unit 23 generates a second power signal corresponding to the second target voltage. In other words, the second control unit 13 controls the second voltage adjustment circuit 22 to output the second DC voltage DC2 corresponding to the second target voltage by the second power signal, that is, the magnitude of the second target voltage may correspond to the setting of the second power signal. Change to change the size of the second DC voltage DC2.

The second voltage regulating circuit 22 is provided under the control of the second power signal and the second The second DC voltage DC2 corresponding to the target voltage. The second voltage regulating circuit 22 receives the second rectified voltage from the second rectifying circuit 21 and adjusts the second rectified voltage to the second DC voltage DC2 under the control of the second power signal. That is, the second voltage regulating circuit 22 performs voltage adjustment under the control of the second power signal to generate a second direct current voltage DC2 having a second target voltage.

Fig. 7 is a detailed architectural diagram of another embodiment of the second power factor correction circuit 20 in Figs. 1 and 2. Referring to FIG. 7, in some embodiments, in addition to the second rectifier circuit 21, the second voltage regulation circuit 22, and the second control unit 23, the second power factor correction circuit 20 further includes a second feedback circuit 24. The second feedback circuit 24 is connected between the output of the second voltage regulating circuit 22 and the second control unit 23, and the second feedback circuit 24 generates a second feedback signal according to the second DC voltage DC2. The second control unit 23 receives the second feedback signal and generates a second power signal corresponding to the second target voltage according to the second feedback signal. The second voltage regulating circuit 22 adjusts the magnitude of the second DC voltage DC2 in response to the second power signal to output a second DC voltage DC2 having a stable voltage value.

In some embodiments, the second power factor correction circuit 20 can have an adjustable second target voltage under the principle that the second target voltage is less than the first target voltage.

Fig. 8 is a block diagram showing another embodiment of the second power factor correction circuit 20 in Figs. 1 and 2. In some embodiments, referring to FIG. 8, in addition to the second rectifier circuit 21, the second voltage regulator circuit 22, and the second control unit 23, the second power factor correction circuit 20 further includes a plurality of second feedback circuits 241, 242, 243 and selection unit 25. The selection unit 25 is connected to the output of the second voltage adjustment circuit 22, and each of the second feedback circuits 241, 242, 243 is connected between the second control unit 23 and the selection unit 25. The second feedback circuits 241, 242, and 243 respectively correspond to the second target voltages of different voltage values.

The selection unit 25 includes a plurality of selection switches 251, 252, 253. The selection switch 251 is connected between the output of the second voltage regulating circuit 22 and the second feedback circuit 241, the selection switch 252 is connected between the output of the second voltage regulating circuit 22 and the second feedback circuit 242, and The switch 253 is connected between the output of the second voltage regulating circuit 22 and the second feedback circuit 243. The selection switches 251, 252, 253 are controlled to be turned on or off by the selection signal.

For example, the second feedback circuit 243 corresponds to the first target voltage of the voltage value V _D , the second feedback circuit 243 corresponds to the first target voltage of the voltage value V _E , and the second feedback circuit 243 corresponds to the voltage value V respectively. The first target voltage of _F. The voltage value V _D , the voltage value V _E and the voltage value V _F are different values (for example, the voltage value V _D , the voltage value V _E and the voltage value V _F are 395V, 390V and 385V, respectively, but the invention is not limited thereto) ). Under the control of the selection signal, one of the selection switches 251, 252, 253 is turned on, while the rest is non-conducting.

When the second target voltage of the signal selection voltage value V _E is selected, the selection switch 252 is turned on in response to the selection signal, and the selection switch 251 and the selection switch 253 form an open circuit in response to the selection signal, thereby turning on the second feedback circuit 242. To the output of the second voltage regulating circuit 22. At this time, the second feedback circuit 242 that is turned on generates a second feedback signal according to the first DC voltage DC1, and transmits the generated second feedback signal to the second control unit 23, so that the second control unit 23 is The second feedback signal generates a second power signal corresponding to the voltage value V _E , and the second power signal enables the second voltage adjustment circuit 22 to adjust the second rectified voltage to the second DC voltage DC2 (ie, the second output will be The DC voltage DC2 is stabilized at the voltage value V _E ), and the second DC voltage DC2 is output to the output circuit 30. Thereby, the second power factor correction circuit 20 can be provided with the second DC voltage DC2 stabilized at different voltage values, so that the required voltage level can be selected according to actual needs.

In this case, the selection unit 25 is only turned on by the selection switch 251, 252 or 253 at the same time, but the invention is not limited thereto. In other embodiments, the selection unit 25 can be turned on according to the selection switches 251, 252, 253. The combination mode (for example, the selection switches 251, 252 are turned on, the selection switch 253 is not turned on; or the selection switches 251, 253 are turned on, the selection switch 252 is not turned on) and the different second feedback signals are provided for the second control unit 23 to generate a corresponding a second power signal of a different second target voltage.

Figure 9 is a detailed architectural diagram of an embodiment of the output circuit 30 of Figures 1 and 2. In some embodiments, referring to FIG. 9, the output circuit 30 includes a first diode 31, a second diode 32, and a storage capacitor 33. The first diode 31 is connected between the first power factor correction circuit 10 and the storage capacitor 33, and the second diode 32 is connected between the second power factor correction circuit 20 and the storage capacitor 33. One end of the storage capacitor 33 is connected to the output of the output circuit 30, and the other end of the storage capacitor 33 is connected to the ground.

The first diode 31 receives the first DC voltage DC1, and according to the physical characteristic that the first diode 31 is turned on or off, that is, the voltage difference between the input end and the output end of the first diode 31 is greater than or equal to the threshold. It is turned on when the voltage is applied, otherwise it is not turned on. Therefore, when the voltage difference between the first DC voltage DC1 and the output end of the first diode 31 (ie, the second DC voltage DC2) is greater than or equal to the threshold voltage, the first diode 31 is turned on to output the first DC voltage DC1. That is, it is equivalent to determining whether the first DC voltage DC1 is smaller than the second DC voltage DC2 (step S031 shown in FIG. 2). When the determination is NO, the first diode 31 is turned on to make the first DC voltage DC1 as an output. Voltage output (step S032). Conversely, when the first DC voltage DC1 is abnormal, causing the voltage difference between the first DC voltage DC1 and the output terminal of the first diode 31 to be less than the threshold voltage, the first diode 31 is rendered non-conductive.

The second diode 32 is similar to the first diode 31 and has a threshold voltage when the second DC voltage DC2 is greater than or equal to the first DC voltage DC1 of the output terminal of the second diode 32 (step S033, ie When the first DC voltage DC1 is smaller than the second DC voltage DC2, the second diode 32 is turned on, and the second DC voltage DC2 is output as an output voltage. Wherein, when the first diode 31 is turned on, the output voltage thereof is greater than the second DC voltage DC2, so that the difference between the input end and the output end of the second diode 32 is less than the threshold voltage, resulting in the second diode Body 32 is not conductive.

The storage capacitor 33 receives the first DC voltage DC1 or the second DC voltage DC2 and accordingly provides an output voltage to the subsequent stage circuit.

In some embodiments, the storage capacitor 33 can be a single capacitor, but the invention is not limited thereto. In other embodiments, the storage capacitor 33 can also be connected in parallel with multiple capacitors or multiple passive components. Combined composition.

In some embodiments, the first power factor correction circuit 10 and the second power factor correction circuit 20 may be the same circuit topology, such as, but not limited to, both having a single feedback circuit, or both. Feedback circuit. In some embodiments, the first power factor correction circuit 10 and the second power factor correction circuit 20 may be different circuit extensions, such as, but not limited to, the first power factor correction circuit 10 has multiple feedback circuits, and The second power factor correction circuit 20 has a single feedback circuit.

In some embodiments, the first control unit 13 can be a PFC controller. The second control unit 23 can be a PFC controller.

In some embodiments, the first power signal can be a PWM (Pulse Width Modulation) signal. The second power signal can also be a PWM signal.

In some embodiments, the first AC power source AC1 can be the first mains, and the second The AC power source AC2 can be the second mains. In some embodiments, the first mains and the second mains may be 110 V AC and 220 V AC, respectively, but the invention is not limited thereto.

In some embodiments, the post-stage circuit can be a load circuit. In some embodiments, the after-stage circuit can include a DC-to-DC converter and a load circuit.

Figure 10 is a block diagram showing another embodiment of the dual input power supply of the present invention. Referring to FIG. 10, the input of the load circuit 50 is coupled to the output of the DC-to-DC converter 40 for receiving the load voltage of the DC-to-DC converter 40 for operation of the load circuit 50.

In an embodiment of the present invention, the step S01 is performed after the step S01 is performed, but the present invention is not limited thereto. In some embodiments, step S02 may be performed before step S02, or Step S01 is performed in synchronization with step S02.

In summary, the dual input power supply and the backup method thereof according to the present invention can provide the output voltage at the output of the first power factor correction circuit 10 when the output of the first power factor correction circuit 10 is normal, and at the first power. When the output of the factor correction circuit 10 is abnormal, the output of the second power factor correction circuit 20 is supplied with an output voltage. This provides a continuous and stable output voltage while supporting dual input power, and can reduce the size of the power supply, reduce the hardware cost, and improve the efficiency.

10‧‧‧First power factor correction circuit

20‧‧‧Second power factor correction circuit

30‧‧‧Output circuit

40‧‧‧DC to DC converter

AC1‧‧‧First AC power supply

AC2‧‧‧second AC power supply

DC1‧‧‧ first DC voltage

DC2‧‧‧second DC voltage

Claims (10)

A dual input power supply, comprising: a first power factor correction circuit, receiving a first alternating current power source, generating a first direct current voltage according to the first alternating current power source, wherein the first power factor correction circuit architecture provides a first a target voltage, and when the first AC power source is normally supplied, the first DC voltage is the first target voltage; a second power factor correction circuit receives a second AC power source, and generates a second AC power source according to the second AC power source a second DC voltage, wherein the first AC power source is different from the second AC power source, the second power factor correction circuit is configured to provide a second target voltage that is less than the first target voltage, and when the second AC power source The second DC voltage is the second target voltage during normal supply; an output circuit connecting the first power factor correction circuit and the second power factor correction circuit, and outputting according to the first DC voltage or the second DC voltage An output voltage, wherein the output circuit outputs the output power based on the first DC voltage when the first DC voltage is normally supplied And outputting the output voltage based on the second DC voltage when the first DC voltage is less than the second DC voltage due to the abnormality of the first AC power source; and connecting the output circuit to the DC converter Receiving the output voltage and generating a load voltage according to the output voltage; wherein the first power factor correction circuit further comprises: a first control unit; a selection unit connected to the output end of the first power factor correction circuit; as well as a first feedback circuit connected between the selection unit and the first control unit, respectively outputting, according to the first DC voltage, a first feedback signal corresponding to the first target voltage of different value to the first control a first control unit that generates a first power signal corresponding to the first target voltage corresponding to the first feedback signal, wherein the selecting unit selects one of the plurality of first feedback circuits to be turned on according to a selection signal, The first feedback circuits are configured to generate corresponding first feedback signals. The dual input power supply device of claim 1, wherein the first power factor correction circuit comprises: a first rectifier circuit, receiving a first alternating current power source, and outputting a first rectified voltage according to the first alternating current power source; The first voltage regulating circuit is connected between the first rectifying circuit and the output circuit, and adjusts the first rectified voltage to the first DC voltage according to a first power signal; a first control unit is connected to the first voltage The adjusting circuit generates the first power signal corresponding to the first target voltage according to a first feedback signal; and wherein the selecting unit selects one of the plurality of first feedback circuits to be turned on to the first according to the selection signal The output of the voltage regulation circuit. The dual input power supply device of claim 1, wherein the second power factor correction circuit comprises: a second rectifier circuit, receiving a second AC power source, and outputting a second rectified voltage according to the second AC power source; a second voltage regulating circuit is connected between the second rectifier circuit and the output circuit, and adjusts the second rectified voltage to the second DC voltage according to a second power signal; A second control unit is coupled to the second voltage regulating circuit to generate the second power signal corresponding to the second target voltage. The dual input power supply of claim 3, wherein the second power factor correction circuit comprises: a second feedback circuit connected between the output of the second voltage regulating circuit and the second control unit, And outputting a second feedback signal to the second control unit according to the second DC voltage, wherein the second control unit generates the second power signal corresponding to the second target voltage according to the second feedback signal. The dual input power supply device of claim 1, wherein the second power factor correction circuit comprises: a second rectifier circuit, receiving a second AC power source, and outputting a second rectified voltage according to the second AC power source; a second voltage regulating circuit is connected between the second rectifier circuit and the output circuit, and the second rectified voltage is adjusted to the second DC voltage according to a second power signal; a second control unit is connected to the second voltage The adjusting circuit generates the second power signal corresponding to the second target voltage according to a second feedback signal; a selection unit is connected to the output end of the second voltage regulating circuit; and a plurality of second feedback circuits are connected thereto Between the selecting unit and the second control unit, respectively outputting the second feedback signal corresponding to the second target voltage of different value to the second control unit according to the second DC voltage, wherein the selecting unit is configured according to a selection signal One of the plurality of second feedback circuits is selected to be turned on to the output of the second voltage regulating circuit. The dual input power supply of claim 1, wherein the output circuit comprises: a storage capacitor, one end is connected to the output end of the output circuit, and the other end is coupled to a ground end; a first diode is connected between the first power factor correction circuit and the storage capacitor; and The second diode is connected between the second power factor correction circuit and the storage capacitor. A backup method for a dual input power supply includes: rectifying a first alternating current power supply by a first power factor correction circuit to output a first rectified voltage, and adjusting and outputting the first rectified voltage according to a first power signal a first DC voltage is applied to an output circuit, wherein the first power factor correction circuit is configured to provide a first target voltage, and when the first AC power source is normally supplied, the first DC voltage is the first target voltage; Using a second power factor correction circuit to output a second DC voltage to an output circuit according to a second AC power source, wherein the second power factor correction circuit is configured to provide a second target voltage that is less than the first target voltage, and When the second AC power source is normally supplied, the second DC voltage is the second target voltage; and the output circuit outputs an output voltage according to the first DC voltage or the second DC voltage, wherein the first DC voltage is The output circuit outputs the output voltage based on the first DC voltage during normal supply, and when the first DC voltage is When the AC power source is abnormal and less than the second DC voltage, the output circuit outputs the output voltage based on the second DC voltage; generating a load voltage according to the output voltage by the DC-DC converter; and wherein, by the first The feedback circuit generates a first feedback signal according to the first DC voltage, and a selection unit selects one of the plurality of first feedback circuits according to a selection signal And generating, by the one of the plurality of first feedback circuits, the first power signal corresponding to the first target voltage. The backup method of the dual-input power supply according to claim 7, wherein the step of outputting a first DC voltage to an output circuit according to a first AC power source by using a first power factor correction circuit comprises: An AC power source is rectified to output a first rectified voltage; the first rectified voltage is adjusted to the first DC voltage according to a first power signal; a first feedback signal is generated according to the first DC voltage; The first feedback signal produces the first power signal corresponding to the first target voltage. The backup method of the dual input power supply of claim 7, wherein the step of outputting a second DC voltage to an output circuit according to a second AC power source by using a second power factor correction circuit comprises: The second AC power source is rectified to output a second rectified voltage; the second rectified voltage is adjusted to the second DC voltage according to a second power signal; a second feedback signal is generated according to the second DC voltage; The second feedback signal generates the second power signal corresponding to the second target voltage. The backup method of the dual input power supply of claim 7, wherein the step of outputting a second DC voltage to an output circuit according to a second AC power source by using a second power factor correction circuit comprises: The second AC power source is rectified to output a second rectified voltage; the first rectified voltage is adjusted to the second DC voltage according to a second power signal; and the second second feedback circuit generates a first according to the second DC voltage Two feedback signals; Selecting, by a selection unit, one of the plurality of second feedback circuits according to a selection signal; and generating, by the one of the plurality of second feedback circuits, the second power signal corresponding to the second target voltage.