TWI466413B - Low power consumption of the source power system - Google Patents

Description

Low-power consumption source power system

The invention relates to a standby power system, in particular to a standby power system with low power consumption.

Since various electronic devices require stable power to maintain work, the power supply is required to provide stable power to drive various types of electronic devices, and most of the power supplies are connected to an input source to obtain an input power, and the power supply is provided. The device has a power conversion unit for converting the input power to form a driving power for transmission to the load. However, such a conventional architecture has only one input source to provide input power, which may be local power or another power supply. When the power supply in the city or the power supply fails or the power drops, the electronic device may be powered off, or the power supply that drives the electronic device may be damaged due to excessive load of the boosting unit, in order to avoid single input source failure. The problem arises when the conventional technology uses an Uninterrupted Power System (UPS) to connect the power supply, thereby temporarily providing stable power to drive the electronic device when the input source fails, thereby reducing the sudden loss of input power. risks of.

A conventional power supply with an uninterruptible power system, as shown in Fig. 1, in a normal state, an AC power is obtained from a mains power supply 1, and the AC power from the mains supply 1 is in the form of a sine wave. The AC power in the form of a square wave is first generated by a filter 2, an AC/DC converter 3, and a DC/AC converter 4 for use by the back-end power supply 5. The conventional uninterruptible power system connected in parallel with the power supply path also obtains the AC power generated by the mains power supply 1 under normal power supply. The AC power is converted into DC power via a battery charger 6 and stored in a battery module 7. When the mains power supply 1 cannot supply the AC power normally, the DC/AC converter 4 is controlled to receive and store by controlling a switch 8 disposed between the AC/DC converter 3 and the DC/AC converter 4. The DC power in the battery module 7 is generated and generated in the form of a square wave to be supplied to the power supply of the back end. However, under this circuit architecture, whether it is a normal power supply state or a state of power supply by an uninterruptible power system, multiple AC and DC conversions are required, which will result in a large amount of power loss.

The main object of the present invention is to overcome the problem of power consumption caused by a conventional power supply having an uninterruptible power system due to multiple power conversions.

To achieve the above objective, the present invention provides a low-power consumption source power system electrically connected to an external power input source, including a power conversion unit that connects the external power input source to obtain external power and generate a converted power. The first power supply circuit and the second power supply circuit are electrically connected to the power conversion unit, respectively, and a power source switching circuit that connects the first power supply circuit and the second power supply circuit. The first power supply circuit receives the converted power and outputs a first output power. The second power supply circuit is connected in parallel with the first power supply circuit. The second power supply circuit includes a charging unit that obtains the converted power and an energy storage unit that is electrically connected to the charging unit. The energy storage unit stores the charging unit. The converted power is input and a second output power is output. The power source switching circuit includes a first switching switch disposed on the first power supply circuit and a second switching switch disposed on the second power supply circuit, and the power source switching circuit determines the conversion power of the power conversion unit. The first output power is directly output by the first power supply circuit, and the power source switching circuit cannot obtain the normal converted power, and determines that the second output power is output by the energy storage unit of the second power supply circuit.

In an embodiment, the power source switching circuit includes a voltage detecting unit electrically connected to the power converting unit to determine whether the power converting unit outputs the normal converted power, and the voltage detecting unit includes a first switch to control the first switching. The switch turns on a first switching signal for the first output power to pass, and a second switching signal that controls the second switching switch to turn on the second output power.

In an embodiment, the voltage detecting unit includes a first control unit that is connected to the first switching switch, and the first control unit detects that the power conversion unit generates the converted power to generate the first switching signal. The first switch.

In one embodiment, the voltage detecting unit includes a second control unit connected to the second switching switch, and the second control unit includes a voltage dividing circuit and a comparison circuit connected to the voltage dividing circuit. The voltage circuit obtains the conversion power of the power conversion unit and divides and outputs a detection voltage to the comparison circuit, and the comparison circuit compares the detection voltage with a preset reference voltage to determine whether to generate the second switching signal control. The second switch is opened and closed.

In one embodiment, the voltage dividing circuit includes a first resistor and a second resistor, and the ratio of the resistance of the first resistor and the second resistor is used to adjust the detected voltage of the converted power to the comparison circuit.

In an embodiment, the low power consumption source power system further includes a boost circuit connected to the first power supply circuit and the second power supply circuit, and the boost circuit includes a first output power or the first a charging/discharging circuit for outputting a power, a boosting switch connected to the charging and discharging circuit, and determining a rising period of the boosting switch to control a charging timing of the second output power to the charging and discharging circuit to generate a boosting power rise And a voltage control unit, and a power output terminal that outputs the first output power or the boosted power.

In an embodiment, the voltage of the boosted power is equal to the voltage of the first output power.

In an embodiment, the boosting circuit includes a control switch disposed between the charge and discharge circuit and the power output end, and the control switch is electrically connected to the boost control unit.

In an embodiment, the boost control unit obtains a detection signal from the first power supply circuit, and the boost control unit controls the boost switch and the control switch to open and close according to the detection signal, and determines to enable the first An output power is directly outputted from the power output terminal through the booster circuit, or the second output power is boosted to the boosted power through the charge and discharge circuit, and then outputted by the power output terminal.

In one embodiment, the charge and discharge circuit includes a storage inductor, a diode, and a storage capacitor.

In an embodiment, the voltage of the first output power is higher than the voltage of the second output power.

In an embodiment, the converted power of the power conversion unit is a direct current power.

In one embodiment, the power conversion unit includes a rectifying and filtering unit connected to the external power input source, a power factor correcting unit connected to the rectifying and filtering unit, a transformer, a pulse width control unit, a switching element, and a rectifying output. unit.

In an embodiment, the energy storage unit is a rechargeable battery.

The low-power consumption of the standby source power system of the present invention mainly sets the uninterruptible power system to the back end of the power conversion unit. Under normal power supply, the converted power generated by the power conversion unit can be directly output to an electronic device or a load. When the power conversion unit is abnormal and the conversion power cannot be generated, the stored energy of the second power supply circuit can output the stored DC power to the electronic device. Therefore, no matter what the circumstances, there is no need to exchange AC and DC, which greatly reduces the power loss caused by the operation of the traditional power supply system with uninterruptible power system.

The detailed description and technical contents of the present invention will now be described as follows:

Referring to FIG. 2, it is a schematic diagram of a basic circuit architecture of an embodiment of the present invention. As shown in the figure, the present invention relates to a low-power consumption source power system electrically connected to an external power input source 10. The backup power system includes a power conversion unit 20 connected to the external power input source 10 to obtain the external power 101 and generate a converted power 201, and is electrically connected to a first power supply circuit 30 of the power conversion unit 20, respectively. A second power supply circuit 40, and a power source switching circuit 50 connecting the first power supply circuit 30 and the second power supply circuit 40. In this embodiment, the power conversion unit 20 includes a rectification filtering unit 21 connected to the external power input source 10, a power factor correction unit 22 connected to the rectification filtering unit 21, a transformer 23, and a pulse width control unit 24. A switching element 25 and a rectifying output unit 26. The external power 101 of the external power input source 10 is an alternating current power. After the external power 101 passes through the rectifying and filtering unit 21 and the power factor correcting unit 22, the power factor correcting unit 22 adjusts the external portion by using an internal variable voltage power level. Power factor and voltage of power 101. The pulse width control unit 24 determines the duty cycle of the switching element 25 to adjust the coil current through the transformer 23. Finally, the converted power 201 is generated via the rectification output unit 26. The converted power 201 is a direct current power. The first power supply circuit 30 receives the converted power 201 generated by the power conversion unit 20 and outputs a first output power 301. The second power supply circuit 40 is connected in parallel to the first power supply circuit 30, and includes a charging unit 41 for obtaining the converted power 201 and an energy storage unit 42 electrically connected to the charging unit 41. The charging unit 41 obtains the converted power 201 and charges the energy storage unit 42 through an internal rectifying and filtering circuit (not shown), so that the energy storage unit 42 outputs a second output power 401. In this embodiment, the energy storage unit 42 is a rechargeable battery.

The power source switching circuit 50 includes a first switch 51 disposed in the first power supply circuit 30 and a second switch 52 disposed on the second power supply circuit 40. The power source switching circuit 50 determines that the first output power 301 is directly output by the first power supply circuit 30 based on the converted power 201 of the power conversion unit 20. When the power source switching circuit 50 cannot obtain the normal converted power 201, it is determined that the second output power 401 is output by the energy storage unit 42 of the second power supply circuit 40.

Referring to FIG. 3, it is a schematic diagram of a detailed circuit structure of an embodiment of the present invention. As shown in the figure, the power source switching circuit 50 includes an electrical connection unit 20 for determining whether the power conversion unit 20 is electrically connected. The voltage detecting unit that normally converts the power 201 is output. The voltage detecting unit includes a first switching signal 501 for controlling the first switching switch to be turned on 51 for the first output power 301 to pass, and a second switching switch 52 for controlling the second output power 401 to pass. The second switching signal 502. The voltage detecting unit includes a first control unit 53 connected to the first switching switch 51, and a second control unit 54 connected to the second switching switch 52. The first control unit 53 detects that the power conversion unit 20 generates the converted power 201 and accordingly generates the first switching signal 501 to the first switch 51. In this embodiment, the first control unit 53 is a control chip. The second control unit 54 includes a voltage dividing circuit 541 and a comparison circuit 542 connected to the voltage dividing circuit 541. The voltage dividing circuit 541 includes a first resistor R1 and a second resistor R2. The voltage dividing circuit 541 obtains the converted power 201 of the power converting unit 20, and utilizes the resistors of the first resistor R1 and the second resistor R2. The conversion power 201 transmits a detection voltage 543 to the comparison circuit 542. The comparison circuit 542 compares the detection voltage 543 with a predetermined reference voltage Vref, and determines whether the second switching signal 502 is generated to control the opening and closing of the second switching switch 52.

When the power conversion unit 20 normally supplies power, the first control unit 53 detects the normal converted power 201 and controls the first switch 51 to be turned on, and the voltage dividing circuit 541 of the second control unit 54 The divided voltage of the converted power 201 generates a detection voltage 543. At this time, the detection voltage 543 is greater than the reference voltage Vref. Therefore, the comparison circuit 542 does not generate the second switching signal 502, and the second switching switch 52 remains in the off state. Therefore, the converted power 201 of the power conversion unit 20 passes through the first power supply circuit 30, and the first power supply circuit 30 directly outputs the first output power 301. When the power conversion unit 20 is abnormal in power supply, the first detecting unit 53 cannot obtain the normal converted power 201, and the first switching signal 501 is not output, so that the first switching off 51 is in the off state. The voltage-dividing circuit 541 of the second control unit 54 loses the normal converted power 201, and the detected voltage 543 generated by the voltage division is smaller than the reference voltage Vref, so the comparison circuit 542 generates the second switching signal. 502 to the second switch 52, the second switch 52 is turned on. Therefore, although the power conversion unit 20 does not generate the normal converted power 201, the energy storage unit 42 located on the second power supply circuit 40 can output the stored DC power, so that the second power supply circuit 40 outputs the second. The power 401 is output. As such, whether the power conversion unit 20 is normal or not, the first output power 301 or the second output power 401 can be supplied by regulating the first power supply circuit 30 and the second power supply circuit 40.

In this embodiment, the voltage of the first output power 301 is not equal to the voltage 401 of the second output power. Taking the voltage of the first output power 301 higher than the voltage of the second output power 401 as an example, in order to maintain the voltage input to the back end electronic device, the standby power system of the present invention further includes a connection to the first power supply circuit 30 and the The boosting circuit 60 of the second power supply circuit 40 is as shown in FIG. The booster circuit 60 includes a charge and discharge circuit 61 for obtaining the first output power 301 or the second output power 401, a boost switch 62 connected to the charge and discharge circuit 61, and a turn-on period of the boost switch 62. The boosting control unit 63 that controls the charging timing of the charging/discharging circuit 61 by the second output power 401 generates a boosting power 601, and outputs a power output 64 of the first output power 301 or the boosting power 601. The charge and discharge circuit 61 includes a storage inductor L, a diode D and a storage inductor C. A control switch 65 is disposed between the charge and discharge circuit 61 and the power output terminal 64. The control switch 65 is connected in parallel to the diode D and electrically connected to the boost control unit 63. The boosting control unit 63 obtains a detection signal 631 from the first power supply circuit 30. The boost control unit 63 controls the opening and closing of the boost switch 62 and the control switch 65 according to the detection signal 631, and determines to enable the The first output power 301 is directly output from the booster circuit 60 and outputted from the power output terminal 64, or the second output power 401 is boosted to the boosted power 601 via the charge and discharge circuit 61, and then the power output terminal 64 output; the voltage of the boost power 601 is equal to the voltage of the first output power 301.

When the booster circuit 60 obtains the first output power 301 by the first power supply circuit 30, the boost control unit 63 generates the corresponding detection signal 631 to turn off the boost switch 62 and The control switch 65 remains open. At this time, the first output power 301 is directly passed through the control switch 65 and output from the power output terminal 64. If the booster circuit 60 obtains the second output power 401 whose voltage is lower than the first output power 301 by the second power supply circuit 40, the boost control unit 63 additionally generates the corresponding detection signal 631. The boost switch 62 and the control switch 65 are simultaneously turned on and off according to an on-period cycle, so that the charge/discharge circuit 61 can charge and discharge the second output power 401, and the second output power 401 can be converted into a The boosted power 601 of the first output power 301 having the same voltage is output from the power output terminal 64.

In summary, the low-power consumption of the standby power system of the present invention is that the uninterruptible power system is disposed at the rear end of the power conversion unit, and the converted power generated by the power conversion unit can be directly output to the electronic device under normal power supply. Used by equipment or load, there is almost no energy loss. When the power conversion unit is abnormal and the conversion power cannot be generated, the stored energy of the DC power supply unit may be outputted by the energy storage unit of the second power supply circuit, and then the voltage of the DC power is raised to the normal working voltage by the boost circuit. Equipment. Therefore, no matter what the circumstances, there is no need to exchange AC and DC, which greatly reduces the power loss caused by the operation of the traditional power supply system with uninterruptible power system. Therefore, the present invention is highly progressive and conforms to the requirements of the invention patent application, and the application is filed according to law, and the praying office grants the patent as soon as possible.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

1. . . Mains power

2. . . filter

3. . . AC/DC converter

4. . . DC/AC converter

5. . . Power Supplier

6. . . battery charger

7. . . Battery module

8. . . Toggle switch

10. . . External power input source

101. . . External power

20. . . Power conversion unit

201. . . Converting electricity

twenty one. . . Rectifier filter unit

twenty two. . . Power factor correction unit

twenty three. . . transformer

twenty four. . . Pulse width control unit

25. . . Switching element

26. . . Rectifier output unit

30. . . First power supply circuit

301. . . First output power

40. . . Second power supply circuit

401. . . Second output power

41. . . Charging unit

42. . . Energy storage unit

50. . . Power source switching circuit

501. . . First switching signal

502. . . Second switching signal

51. . . First switch

52. . . Second switch

53. . . First control unit

54. . . Second control unit

541. . . Voltage dividing circuit

542. . . Comparison circuit

543. . . Detection voltage

60. . . Boost circuit

601. . . Boost power

61. . . Charge and discharge circuit

62. . . Boost switch

63. . . Boost control unit

631. . . Detection signal

64. . . Power output

65. . . Control switch

R1. . . First resistance

R2. . . Second resistance

L. . . Energy storage inductor

D. . . Dipole

C. . . Storage capacitor

Vref. . . Reference voltage

Figure 1 is a schematic diagram of the circuit architecture of a conventional power supply with an uninterruptible power system.

2 is a schematic diagram of a basic circuit architecture of an embodiment of a low-power consumption source power system according to the present invention.

FIG. 3 is a schematic diagram showing the detailed circuit structure of an embodiment of a low-power consumption source power system according to the present invention.

10. . . External power input source

101. . . External power

20. . . Power conversion unit

201. . . Converting electricity

twenty one. . . Rectifier filter unit

twenty two. . . Power factor correction unit

twenty three. . . transformer

twenty four. . . Pulse width control unit

25. . . Switching element

26. . . Rectifier output unit

30. . . First power supply circuit

301. . . First output power

40. . . Second power supply circuit

401. . . Second output power

41. . . Charging unit

42. . . Energy storage unit

50. . . Power source switching circuit

501. . . First switching signal

502. . . Second switching signal

51. . . First switch

52. . . Second switch

60. . . Boost circuit

64. . . Power output

Claims (14)

A low-power consumption source power system electrically connected to an external power input source includes:
a power conversion unit connected to the external power input source to obtain external power and generate a converted power;
a first power supply circuit electrically connected to the power conversion unit to receive the converted power and output a first output power;
a second power supply circuit electrically connected to the power conversion unit and connected in parallel to the first power supply circuit, the second power supply circuit includes a charging unit that obtains the converted power, and an energy storage unit that is electrically connected to the charging unit, The energy storage unit stores the converted power charged by the charging unit and outputs a second output power; and a power source switching circuit includes a first switch disposed on the first power supply circuit and a second switch a second switching switch of the power supply circuit, the power source switching circuit determines to directly output the first output power by the first power supply circuit according to the converted power of the power conversion unit, and the power source switching circuit cannot obtain the normal converted power. It is determined that the second output power is output by the energy storage unit of the second power supply circuit. The low-power consumption source power system according to claim 1, wherein the power source switching circuit includes a voltage detection device electrically connected to the power conversion unit to determine whether the power conversion unit outputs the normal conversion power. a voltage detecting unit includes a first switching signal for controlling the first switching switch to be turned on for the first output power, and a second switching signal for controlling the second switching switch to be turned on for the second output power to pass . The low-power consumption source power system of claim 2, wherein the voltage detecting unit includes a first control unit connected to the first switch, the first control unit detecting the power conversion unit The generating the converted power corresponds to generating the first switching signal to the first switching switch. The low-power consumption source power system of claim 2, wherein the voltage detecting unit comprises a second control unit connected to the second switch, the second control unit includes a voltage dividing circuit And a comparison circuit connected to the voltage dividing circuit, the voltage dividing circuit obtains the conversion power of the power conversion unit and divides and outputs a detection voltage to the comparison circuit, and the comparison circuit compares the detection voltage with a preset The reference voltage comparison determines whether the second switching signal is generated to control the opening and closing of the second switching switch. The low-power consumption source power system of claim 4, wherein the voltage dividing circuit comprises a first resistor and a second resistor, and the resistor ratio is adjusted by using the first resistor and the second resistor. The converted power is transmitted to the detection voltage of the comparison circuit. The low-power consumption source power system of claim 1, further comprising a boost circuit connected to the first power supply circuit and the second power supply circuit, the boost circuit including a first output power Or a charging/discharging circuit of the second output power, a boosting switch connected to the charging and discharging circuit, and determining a boosting switch on-period to control a charging timing of the second output power to the charging and discharging circuit to generate a boosting a boost control unit for power, and a power output that outputs the first output power or the boost power. The low-power consumption source power system of claim 6, wherein the voltage of the boost power is equal to the voltage of the first output power. The low-power consumption source power system of claim 6, wherein the boosting circuit includes a control switch disposed between the charging and discharging circuit and the power output end, the control switch electrically connecting the control switch Boost control unit. The low-power consumption source power system of claim 8, wherein the boost control unit obtains a detection signal from the first power supply circuit, and the boost control unit controls the rise according to the detection signal. Pressing and closing the pressure switch and the control switch, determining that the first output power is directly passed through the booster circuit and outputting from the power output terminal, or boosting the second output power to the boosted power through the charge and discharge circuit It is then output by the power output. The low-power consumption source power system of claim 6, wherein the charge and discharge circuit comprises a storage inductor, a diode, and a storage capacitor. The low-power consumption source power system of claim 1, wherein the voltage of the first output power is higher than the voltage of the second output power. The low-power consumption source power system according to claim 1, wherein the power converted by the power conversion unit is DC power. The low-power consumption source power system of claim 1, wherein the power conversion unit comprises a rectifying and filtering unit connected to the external power input source, a power factor correcting unit connected to the rectifying and filtering unit, and a transformer. a pulse width control unit, a switching element, and a rectifying output unit. The low-power consumption source power system of claim 1, wherein the energy storage unit is a rechargeable battery.