TWI511417B - Dc uninterruptible power supply system and device - Google Patents

Description

DC uninterruptible power system and device

The invention relates to an uninterruptible power system and device, in particular to a DC uninterruptible power system and device for a DC power supply.

Referring to FIG. 1, a conventional uninterruptible power device 1 has a voltage distributor 11 for converting a three-phase AC power source 300 into a single-phase AC power source, and converting a single-phase AC power output from the voltage distributor 11 into a DC power supply. The power supply unit 13 supplies DC power to the servo 200, and simultaneously outputs DC power to a charging circuit 31 to convert the DC power to the rated voltage of the battery 33 and charge the battery 33. The battery 33 is also electrically coupled to a transformer module 35, and a switch 37 is electrically coupled between the battery 33 and a server 200 and controlled by the power supply unit 13. When the AC power supply 300 stops outputting power, the power supply unit 13 controls the switch 37 to conduct the transformer module 35 and the server 200, so that the battery 33 outputs power and is converted into the DC power required by the server 200 via the transformer module 35. The server 200 is then supplied via the switch 37, thereby achieving the purpose of continuous power.

However, the conventional uninterruptible power device 1 can only be used for a single load, and cannot be connected to an adjacent uninterruptible device, and cannot provide power at the right time. Use the load of the adjacent uninterrupted device. In addition, the transformer module 35 of the conventional uninterruptible power device 1 mostly adopts a switching (switching) DC-DC converter with complicated circuit and large volume, so that the overall volume of the uninterruptible device 1 cannot be reduced, and is not suitable for It is used in electronic products that appeal to thin and light.

Accordingly, it is an object of the present invention to provide a DC uninterruptible power system including a plurality of parallel uninterruptible DC uninterruptible devices, such that each of the DC uninterruptible devices can provide power to adjacent parallels in a timely manner. The DC uninterrupted device.

Another object of the present invention is to provide a DC uninterruptible power system including a plurality of parallel uninterruptible DC uninterruptible devices, wherein the DC uninterruptible device can effectively reduce the overall volume and increase the reaction speed.

Accordingly, the present invention provides a DC uninterruptible power system including a plurality of uninterruptible power-saving devices, each of which receives a DC power input to supply power to a load, and the uninterrupted devices are connected in parallel with each other. And each of the uninterruptible devices includes: a power line electrically coupled to the load, and one end of which is electrically coupled to the DC power source to transmit a first current to the load; a battery module, and the power line Electrically coupled to obtain power of the DC power source and stored; a voltage detecting circuit electrically coupled to the power line, and generating a first when detecting that the voltage of the DC power source is lower than a first preset value a triggering signal; a current detecting circuit electrically coupled between the power line and a power line of an adjacent uninterruptible device, and detecting that the adjacent DC uninterrupted device is on the power line The first current transmitted When the second preset value is lower than a second preset value, a second trigger signal is generated; a first switch is electrically coupled to the power line for guiding or disconnecting the current detecting circuit and the power line; and a control unit And electrically connecting the battery module, the voltage detecting circuit, the current detecting circuit and the first switch, and controlling the battery module output power to the power line according to the first trigger signal, and according to the second The trigger signal controls the first switch to conduct the power line and the current detecting circuit.

Preferably, after the first switch is connected to the power line and the current detecting circuit, the current detecting circuit detects a second current flowing to the power line of the adjacent DC uninterrupted device on the power line, and When the second current is greater than a third preset value, a third trigger signal is generated to the control unit, so that the control unit controls the first switch to turn off the power line and the current detecting circuit according to the third trigger signal. .

Preferably, after the first switch is connected to the power line and the current detecting circuit, the current detecting circuit detects the first current transmitted on the power line of the adjacent DC uninterrupted device, and determines the When the first current reaches a fourth preset value, a fourth trigger signal is generated to the control unit, so that the control unit controls the first switch to turn off the power line and the current detecting circuit according to the fourth trigger signal.

Furthermore, the present invention provides a DC UPS that accepts a DC power input to supply power to a load and can be connected in parallel with an adjacent DC UPS, and includes: a power line electrically coupled to the load And one end is electrically coupled to the DC power source to transmit power to the load; a battery module is electrically coupled to the power line to obtain power of the DC power source And storing a voltage detecting circuit electrically coupled to the power line and generating a first trigger signal when detecting a voltage of the DC power source being lower than a first preset value; a current detecting circuit, a first current that is coupled between the power line and a power line of the adjacent uninterruptible device, and that is detected on the power line of the adjacent DC power device is lower than a second preset a second trigger signal is generated; a first switch electrically coupled to the power line between the current detecting circuit and the DC power source; and a control unit, the battery module, and the voltage detector The measuring circuit, the current detecting circuit and the first switch are electrically coupled, and control the battery module output power to the power line according to the first trigger signal, and control the first switch to be connected according to the second trigger signal. Power line and the current detecting circuit.

Preferably, the battery module includes a battery unit, a charging circuit and a discharging circuit. The charging circuit is electrically coupled between the power line and the battery unit to obtain power of the DC power source and charge the battery unit. The discharge circuit is electrically coupled between the power line and the battery unit to output power of the battery unit to the power line, and the control unit controls the battery unit output power to the discharge circuit according to the first trigger signal.

Preferably, the charging circuit includes a DC-DC converter electrically coupled to the power line and a second switch electrically coupled between the DC-DC converter and the battery unit, the DC-DC converter The voltage output from the DC power source is converted into a rated voltage of the battery unit, and the battery unit is charged via the second switch.

Preferably, the discharge circuit includes a linear regulator electrically coupled to the battery unit and an electrical coupling between the linear regulator and the power line And a third switch, the linear regulator adjusts the voltage outputted by the battery unit to be the same as the voltage of the DC power source, and then outputs the power to the power line through the third switch.

Preferably, the control unit includes a battery management module electrically coupled to the battery unit and a battery management module, the voltage detection circuit, the current detection circuit and the first switch. a controller, and the controller controls the battery unit output power according to the first trigger signal, and the controller controls the first switch to guide the power line and the current detection according to the second trigger signal Circuit.

Preferably, after the first switch is connected to the power line and the current detecting circuit, the current detecting circuit detects a second current flowing to the adjacent DC uninterrupting device on the power line, and determines the When the second current is greater than a third preset value, a third trigger signal is generated to the control unit, so that the control unit controls the first switch to turn off the power line and the current detecting circuit according to the third trigger signal.

Preferably, after the first switch is connected to the power line and the current detecting circuit, the current detecting circuit detects the first current of the adjacent DC uninterrupted device, and determines that the first current reaches When a fourth preset value is generated, a fourth trigger signal is generated to the control unit, so that the control unit controls the first switch to turn off the power line and the current detecting circuit according to the fourth trigger signal.

The present invention provides a first switch for electrically coupling a power line with the adjacent DC uninterruptible device on a power line of the DC uninterruptible device, and is electrically coupled to the first switch and the adjacent DC Power off device When the current detecting circuit detects that the adjacent DC uninterruptible power supply is abnormal, the first trigger signal is generated, and the control unit controls the first switch to guide the power line and the adjacent DC uninterruptible device to The power supply is supplied to the adjacent DC uninterruptible device through the power line in time to achieve the instant mutual support power between the DC uninterrupted devices. Moreover, the linear regulator is used as the step-down conversion circuit in the discharge circuit of the DC power-saving device, which can further reduce the overall volume, power consumption and cost of the DC power-saving device, and improve the reaction time of the discharge circuit.

2, 5‧‧‧ DC continuous power device

3‧‧‧DC power supply

4, 6‧‧‧ load

21, 51‧‧‧Power line

22‧‧‧ battery module

23‧‧‧Voltage detection circuit

24‧‧‧First switch

25‧‧‧ Current detection circuit

26‧‧‧Control unit

221‧‧‧Charging circuit

222‧‧‧ battery unit

223‧‧‧Discharge circuit

224‧‧‧DC-DC converter

225‧‧‧second switch

226‧‧‧Linear adjuster

227‧‧‧ third switch

261‧‧‧Battery Management Module

262‧‧‧ Controller

400‧‧‧DC uninterruptible power system

Vdc‧‧‧ voltage

I ₁ ‧‧‧First current

I ₂ ‧‧‧second current

CS1‧‧‧First control signal

CS2‧‧‧second control signal

DS1‧‧‧ third control signal

DS2‧‧‧ fourth control signal

U1~Un‧‧‧ DC uninterruptible device

S1~Sn‧‧‧ first switch

L1~Ln‧‧‧ load

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a circuit block diagram illustrating a circuit block of an uninterruptible device and its operation; FIG. Is a circuit block diagram illustrating the main circuit block of a preferred embodiment of the DC power-supplied device of the present invention and its operation mode; FIG. 3 is a circuit diagram illustrating the DC power supply of the present embodiment. When the devices are connected in parallel to form a DC power system, the power can be mutually supported in real time; and FIG. 4 is a circuit block diagram illustrating the detailed circuit blocks of the DC power storage device of the present embodiment and their interconnection relationship.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, it is a preferred embodiment of the DC power-sequencing device 2 of the present invention, which receives the input of the DC power source 3 to supply power to a load 4, and can be connected to an adjacent DC power-saving device 5. Parallel, and comprising a power line 21, a battery module 22, a voltage detecting circuit 23, a first switch 24, a current detecting circuit 25 and a control unit 26. The power line 21 is electrically coupled to the load 4, and one end of the power line 21 is electrically coupled to the DC power source 3 to transmit power to the load 4. In this embodiment, the load 4 can be any electronic device or electronic device that uses direct current, for example, Notebook, server, etc. Moreover, the adjacent DC uninterruptible device 5 has the same circuit structure as the DC uninterruptible device 2 of the present embodiment, and the current detecting circuit 25 is electrically coupled to the power line 21 and the adjacent DC uninterrupting device 5 The first switch 24 is electrically coupled to the power line 21 and is controlled by the control unit 26 to conduct or disconnect the current detecting circuit 25 and the power line 21.

The battery module 22 is electrically coupled to the power line 21 to obtain power of the DC power source 3 and store it. The battery module 22 mainly includes a charging circuit 221, a battery unit 222, and a discharging circuit 223. The charging circuit 221 converts the voltage Vdc of the DC power source 3 into a rated voltage of the battery unit 222 and charges the battery unit 222. The battery unit 222 may be an existing rechargeable battery such as lithium, nickel hydrogen, nickel cadmium, or lead acid, which is composed of a plurality of phases connected in series, in parallel, or in series and parallel. The discharge circuit 223 is configured to convert the voltage output from the battery unit 222 into the same voltage as the DC power source Vdc (ie, the voltage required for the load 4) and output it to the power line 21.

The voltage detecting circuit 23 is electrically coupled to the power line 21 to detect a voltage Vdc of the DC power source 3, and generates a first trigger signal when the determining voltage Vdc is lower than a first preset value. The current detecting circuit 26 is electrically coupled between the first switch 24 and the power line 51 of the adjacent DC power-supplied device 5, and detects a first transmission on the power line 51 of the adjacent DC power-saving device 5. The current I ₁ is generated, and when it is determined that the first current I _{1 is} lower than a second preset value, a second trigger signal is generated. The control unit 26 is electrically coupled to the battery module 22, the voltage detecting circuit 23, the current detecting circuit 25, and the first switch 24 to control the output power of the battery module 22 to the power line 21 according to the first trigger signal, and according to the second The trigger signal controls the first switch 24 to conduct the power line 21 and the current detecting circuit 25.

Therefore, when the control unit 26 receives the first trigger signal from the voltage detecting circuit 23, indicating that the DC power supply 3 is not properly powered, for example, the power supply is stopped or the power supply is unstable, the control unit 26 controls the battery module 22 to output power to The power line 21 is supplied to the load 4 to achieve the purpose of making the load 4 uninterrupted.

Moreover, when the DC power supply 3 is normally powered and the control unit 26 receives the second trigger signal from the current detecting circuit 25, indicating that the adjacent DC uninterruptible power device 5 cannot supply power normally, the control unit 26 immediately controls the first The switch 24 is connected to the power line 21 and the current detecting circuit 26, so that the DC power source 3 can be powered in time via the power line 21, the first switch 24 and the current detecting circuit 25 to the power line 51 electrically coupled to the adjacent DC uninterruptible device 5. The load 6 on the upper side achieves the purpose of making the load 6 electrically coupled to the adjacent DC uninterruptible device 5 uninterrupted. Of course, in the above embodiment, even if the DC power supply 3 is not powered normally and is powered by the battery module 22, the battery module 22 It is also possible to supply power to the load 6 electrically coupled to the adjacent DC power-supplied device 5 via the power line 21, the first switch 24, and the current detecting circuit 25 in time.

Furthermore, after the first switch 24 is connected to the power line 21 and the adjacent DC power-dissipating device 5, the current detecting circuit 25 continuously detects that the power line 21 is flowing from the DC uninterrupter device 2 to the adjacent DC line. a second current I ₂ of the power line 51 of the power-off device 5, and determining that the second current I _{2 is} greater than a third preset value (overcurrent), for example, when a short-circuit condition occurs between adjacent DC uninterruptible devices 5 A third trigger signal is generated to the control unit 26, so that the control unit 26 controls the first switch 24 to open (non-conduct) the power line 21 and the current detecting circuit 25 according to the third trigger signal to protect the DC uninterrupting device 2 itself. The circuit does not burn out due to excessive output current (overcurrent).

In addition, when the adjacent DC power-supplied device 5 resumes normal power supply, and the current detecting circuit 25 detects the first current I ₁ transmitted on the power line 51 of the adjacent DC power-saving device 5, and judges When a current I ₁ reaches a fourth preset value, a fourth trigger signal is generated to the control unit 26, and the control unit 26 controls the first switch 24 to turn off (non-conduct) the power line 21 and the current according to the fourth trigger signal. The circuit 25 is detected and no longer supplied to the adjacent DC uninterrupted device 5.

Therefore, as shown in FIG. 3, when a plurality of DC uninterrupted devices U1 to Un of the present embodiment are connected in series through the first switches S1 to Sn to the DC power system 400, when one of the DCs is continuously When the electric device, such as the DC uninterruptible device U3, cannot supply power to its load L3, the DC uninterruptible device U2 will immediately detect it, and let its first switch S2 immediately connect its power line and DC uninterrupted device U3. Power line while powering in time The load L3 electrically coupled to the DC uninterruptible device U3; similarly, when the DC uninterruptible device U2 cannot be normally powered, the DC uninterruptible device U1 can supply power to the DC uninterruptible device U2 in time, and It achieves the effect of mutually supporting power between DC uninterruptible devices U1~Un.

Referring to FIG. 4 again, it is a block diagram of a more detailed circuit of the battery module 22 and the control unit 26 of the DC power-supplied device 2 of the present embodiment. The charging circuit 221 of the battery module 22 further includes a DC-DC converter 224 and a second switch 225. The discharging circuit 227 further includes a linear regulator 226 and a battery electrically coupled to the battery unit 222. A third switch 227 is coupled between the linear regulator 226 and the power line 21. The control unit 26 further includes a battery management module 261 and a controller 262 electrically coupled to the battery unit 222.

The DC-DC converter 224 is configured to convert the voltage Vdc of the DC power source 3 into the rated voltage of the battery unit 222 and then charge the battery unit 222 via the second switch 225. The DC-DC converter 224 and the second switch 225 are respectively controlled by a first control signal CS1 and a second control signal CS2 outputted by the controller 262 of the control unit 26, for example, the controller 262 does not receive When the first trigger signal is received, the charging circuit 221 is controlled to charge the battery unit 222 until the battery unit 222 is fully charged, and when the controller 262 receives the first trigger signal, the battery unit 222 is controlled to discharge through the battery management module 261 ( At the same time, since the DC power source 3 cannot supply power normally, the controller 262 controls the charging circuit 221 to suspend charging of the battery unit 222 until the DC power source 3 resumes normal power supply.

In addition, the controller 262 also outputs a third control signal DS1. And a fourth control signal DS2 controls whether the linear regulator 226 and the third switch 227 are activated, respectively, so that the linear regulator 226 steps down the voltage output by the battery unit 222 to convert the voltage into a voltage suitable for the load 4 (with the DC power supply). After the voltage Vdc of 3 is the same, it is sent to the power line 21 via the third switch 227 to supply the load 4 in a timely manner. For example, when the controller 262 receives the first trigger signal, the controller 262 controls the discharge circuit 223 to operate, so that the same voltage as the direct current 3 is outputted to the power line 21 for use by the load 4 until the DC power source 3 resumes normal power supply.

It is worth mentioning that the linear regulator 226 used in the discharge circuit 223 of the embodiment is also called a low dropout (LDO) regulator, which has a fast response speed, low power consumption, small volume, low cost, and the like. Therefore, the volume, power consumption, and cost of the DC power-saving device 2 can be specifically reduced, and the reaction speed of the discharge circuit 223 and the DC power-saving device 2 can be improved.

In summary, the first switch 25 for electrically coupling the power line 21 and the adjacent DC power-supplied device 5 is disposed on the power line 21 of the DC power-supplied device 2, and is electrically coupled to When the current detecting circuit 25 between the first switch 25 and the adjacent DC power saving device 5 detects that the power supply of the adjacent DC power saving device 5 is abnormal, the first trigger signal is generated and the control unit 26 controls the first A switch 25 leads the power line 21 and the adjacent DC power-dissipating device 5 to supply power to the load coupled to the adjacent DC power-dissipating device 5 through the power line 21 in a timely manner, thereby reaching between the DC power-saving devices The power of each other is supported in time, and the linear regulator 226 is used as the step-down conversion circuit in the discharge circuit 223 to further reduce the DC The overall volume, power consumption, and cost of the power-off device 2 increase the reaction time of the discharge circuit 223 and the DC power-up device 2, and the object of the present invention is achieved.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

2, 5‧‧‧ DC continuous power device

3‧‧‧DC power supply

4, 6‧‧‧ load

21, 51‧‧‧Power line

22‧‧‧ battery module

23‧‧‧Voltage detection circuit

24‧‧‧First switch

25‧‧‧ Current detection circuit

26‧‧‧Control unit

221‧‧‧Charging circuit

222‧‧‧ battery unit

223‧‧‧Discharge circuit

Vdc‧‧‧ voltage

I ₁ ‧‧‧First current

I ₂ ‧‧‧second current

Claims (10)

A DC uninterruptible power system includes a plurality of uninterruptible power devices, each of which receives a DC power input to supply power to a load, and the uninterrupted devices are connected in parallel with each other The UPS includes: a power line electrically coupled to the load, and one end of which is electrically coupled to the DC power source to transmit a first current to the load; a battery module electrically coupled to the power line, Acquiring and storing the power of the DC power source; a voltage detecting circuit electrically coupled to the power line, and generating a first trigger signal when detecting that the voltage of the DC power source is lower than a first preset value; a current detecting circuit electrically coupled between the power line and a power line of an adjacent uninterruptible device, and detecting the transmission of the adjacent DC uninterrupted device on the power line When a current is lower than a second preset value, a second trigger signal is generated; a first switch is electrically coupled to the power line for guiding or disconnecting the current detecting circuit and the power line; and Control unit, and the battery module, the The voltage detecting circuit, the current detecting circuit and the first switch are electrically coupled, and control the battery module output power to the power line according to the first trigger signal, and control the first switch guide according to the second trigger signal The power line and the current detecting circuit are connected. The DC uninterruptible power system of claim 1, wherein the first switch After the power line and the current detecting circuit are connected, the current detecting circuit detects a second current flowing to the power line of the adjacent DC uninterrupting device on the power line, and determines that the second current is greater than a third When the preset value is generated, a third trigger signal is generated to the control unit, so that the control unit controls the first switch to turn off the power line and the current detecting circuit according to the third trigger signal. The DC uninterruptible power system of claim 2, wherein after the first switch conducts the power line and the current detecting circuit, the current detecting circuit detects a power line of the adjacent DC uninterrupted device Transmitting the first current, and determining that the first current reaches a fourth preset value, generating a fourth trigger signal to the control unit, so that the control unit controls the first switch according to the fourth trigger signal The power line and the current detecting circuit are turned on. A DC uninterruptible device receives a DC power input to supply power to a load, and can be connected in parallel with an adjacent DC uninterrupted device, and includes: a power line electrically coupled to the load, and one end thereof The DC power source is electrically coupled to transmit power to the load; a battery module is electrically coupled to the power line to obtain power of the DC power source and stored; a voltage detecting circuit is electrically coupled to the power line, and A first trigger signal is generated when a voltage of the DC power source is lower than a first preset value; and a current detecting circuit is electrically coupled to the power line and the adjacent one a second trigger signal is generated between a power line of the power-off device and when a first current transmitted on the power line of the adjacent DC power-storing device is lower than a second preset value; The first switch is electrically coupled to the power line between the current detecting circuit and the DC power source; and a control unit, the battery module, the voltage detecting circuit, the current detecting circuit, and the first A switch is electrically coupled, and controls the output power of the battery module to the power line according to the first trigger signal, and controls the first switch to conduct the power line and the current detecting circuit according to the second trigger signal. The DC power-supplied device of claim 4, wherein the battery module comprises a battery unit, a charging circuit and a discharging circuit, the charging circuit is electrically coupled between the power line and the battery unit to obtain the The power of the DC power source is charged to the battery unit, the discharge circuit is electrically coupled between the power line and the battery unit to output power of the battery unit to the power line, and the control unit controls the power according to the first trigger signal The battery unit outputs power to the discharge circuit. The DC power-storing device of claim 5, wherein the charging circuit comprises a DC-DC converter electrically coupled to the power line and an electrical coupling between the DC-DC converter and the battery unit And a second switch, the DC-DC converter converts the voltage output by the DC power source into a rated voltage of the battery unit, and charges the battery unit via the second switch. The DC uninterrupted device of claim 5, wherein the discharge circuit package a linear regulator electrically coupled to the battery unit and a third switch electrically coupled between the linear regulator and the power line, the linear regulator adjusting the voltage outputted by the battery unit to the DC power supply The voltage is the same and is output to the power line through the third switch. The DC power-supplied device of claim 5, wherein the control unit comprises a battery management module electrically coupled to the battery unit, and a battery management module, the voltage detection circuit, and the current detection a controller electrically coupled to the first switch, and the controller controls the battery unit output power according to the first trigger signal, and the controller controls the first according to the second trigger signal The switch conducts the power line and the current detecting circuit. The DC power-supplied device of any one of claims 4 to 8, wherein after the first switch conducts the power line and the current detecting circuit, the current detecting circuit detects that the power line flows to the phase When a second current of the adjacent DC power supply device is determined, and determining that the second current is greater than a third preset value, generating a third trigger signal to the control unit, so that the control unit controls according to the third trigger signal The first switch disconnects the power line from the current detecting circuit. The DC power-supplied device of claim 9, wherein after the first switch conducts the power line and the current detecting circuit, the current detecting circuit detects the first of the adjacent DC uninterrupting devices a current, and determining that the first current reaches a fourth preset value, generating a fourth trigger signal to the control unit, so that the control unit controls the first switch to disconnect the power line according to the fourth trigger signal Current detecting circuit .