CN102118057A - DC uninterruptible power supply circuit with integrated charging and discharging circuit - Google Patents

Abstract

The invention relates to a direct current uninterrupted power supply circuit with an integrated charging and discharging circuit, which comprises an alternating current-direct current conversion circuit; an energy storage unit; a first path switching circuit; a second path switching circuit; the input end and the output end of the integrated charging and discharging circuit are respectively connected with the first path switching circuit and the second path switching circuit and used for charging or discharging the energy storage unit; and an operation control unit. When the input power supply is abnormal, the input end and the output end of the integrated charging and discharging circuit are respectively and correspondingly connected with the energy storage unit and the power supply output end, so that the electric energy discharged by the energy storage unit is transmitted to the power supply output end through the integrated charging and discharging circuit; when the input power supply is normal, the input end and the output end of the integrated charging and discharging circuit are respectively and correspondingly connected with the power supply output end and the energy storage unit, so that the integrated charging and discharging circuit charges the energy storage unit. The invention has the advantages of small volume, less part number, lower circuit complexity, lower manufacturing cost and the like.

Description

DC uninterruptible power supply circuit with integrated charging and discharging circuit

technical field

The present invention relates to a power supply circuit, in particular to a DC uninterruptible power supply circuit (Uninterruptible power supply, UPS) with an integrated charging and discharging circuit.

Background technique

With the rapid development of information industry and high-tech industry, most precision electronic instruments and equipment need to rely on high-quality power supply to maintain normal operation. In various power supply methods, the uninterruptible power supply can not only ensure that the power supply will not be interrupted, but also provide high-quality power, so the uninterruptible power supply has become the best solution for providing high-quality power today. Applied to network communication equipment, data center (Data center) and some important information equipment.

The traditional uninterruptible power supply has a charging circuit (charge circuit) and a DC-DC converter circuit (DC-DC converter circuit) for backup power. When the mains power is normal, the traditional uninterruptible power supply will charge the battery through the charging circuit. Charging, at this time the DC-DC conversion circuit will stop running. Conversely, when the mains power is interrupted, the traditional uninterruptible power supply will use the DC-DC conversion circuit to convert the voltage value of the battery, such as 11 volts (V), to the rated voltage value of the device, such as 12 volts, at this time the charging circuit will stop running.

It can be seen that the traditional uninterruptible power supply needs to use two independent circuits, the charging circuit and the DC-DC conversion circuit, so that the battery can be charged and discharged when the mains is normal and interrupted, resulting in a large uninterruptible power supply. Volume, higher part count, higher circuit complexity, and higher manufacturing cost. Also, because the charging circuit and the DC-DC conversion circuit are not running at the same time, the uninterruptible power supply's circuit usage is low.

Therefore, how to develop a DC uninterruptible power supply circuit with an integrated charge-discharge circuit that can improve the above-mentioned defects of the prior art is an urgent problem for those skilled in the art.

Contents of the invention

The object of the present invention is to provide a DC uninterruptible power supply circuit with an integrated charging and discharging circuit. A single integrated charging and discharging circuit is used to charge and discharge the energy storage unit when the input power is normal and abnormal, so that the integrated The DC uninterruptible power supply circuit of the charging and discharging circuit has smaller volume, fewer parts, lower circuit complexity, lower manufacturing cost and higher circuit utilization rate. In addition, compared with the traditional DC uninterruptible power supply circuit, when charging, the operating efficiency of the DC uninterruptible power supply circuit with integrated charging and discharging circuit can be improved. On the other hand, when discharging, the power supply of the energy storage unit can be increased. time.

To achieve the above purpose, a broad embodiment of the present invention is to provide a DC uninterruptible power supply circuit with an integrated charging and discharging circuit, which is used to receive input power and provide uninterrupted DC output power at the power supply output end, which includes : AC-DC conversion circuit, connected to the power supply output terminal and the common contact point; energy storage unit, used to store electric energy; the first path switching circuit, connected to the power supply output terminal and the energy storage unit; the second path switching circuit, connected to the energy storage unit unit and power supply output; integrated charging and discharging circuit, the input and output of the integrated charging and discharging circuit are respectively connected to the first path switching circuit and the second path switching circuit to charge or discharge the energy storage unit; and to operate control unit. Wherein, when the input power supply is abnormal, the operation control unit controls the first path switching circuit and the second path switching circuit to switch paths, so that the input end and output end of the integrated charging and discharging circuit are connected to the energy storage unit and the power supply output end respectively, And the electric energy discharged by the energy storage unit is transmitted to the power supply output terminal through the integrated charging and discharging circuit; and when the input power is normal, the operation control unit controls the first path switching circuit and the second path switching circuit to switch paths, so that the integrated charging and discharging circuit The input end and output end of the power supply are respectively connected to the power supply output end and the energy storage unit, and the integrated charging and discharging circuit charges the energy storage unit.

In order to achieve the above purpose, another broad embodiment of the present invention is to provide a DC uninterruptible power supply circuit with an integrated charging and discharging circuit, which is used to make the DC output power supplied by the DC power supply equipment to the electronic equipment uninterrupted, which includes : The energy storage unit is connected to the common contact to store electric energy; the first path switching circuit is connected to the power supply terminal of the DC power supply equipment and the energy storage unit; the second path switching circuit is connected to the power supply of the energy storage unit and the DC power supply equipment end; integrated charging and discharging circuit, the input end and output end of the integrated charging and discharging circuit are respectively connected to the first path switching circuit and the second path switching circuit to charge or discharge the energy storage unit; and the operation control unit; wherein , when the DC output power supply is abnormal, the operation control unit controls the first path switching circuit and the second path switching circuit to switch paths, so that the input end and output end of the integrated charging and discharging circuit are respectively connected to the energy storage unit and the DC power supply equipment. The power supply terminal, and the electric energy discharged by the energy storage unit is transmitted to the power supply terminal of the DC power supply device through the integrated charging and discharging circuit; and when the DC output power is normal, the operation control unit controls the first path switching circuit and the second path switching circuit to switch paths , so that the input end and the output end of the integrated charge-discharge circuit are respectively connected to the power supply end of the DC power supply device and the energy storage unit, and the integrated charge-discharge circuit charges the energy storage unit.

The beneficial effect of the present invention is that the DC uninterruptible power supply circuit with integrated charging and discharging circuit of the present invention has smaller volume, fewer parts, lower circuit complexity, lower manufacturing cost, and higher circuit utilization rate. In addition, the operation mode adds a conduction mode with less power loss, which improves the operating efficiency during charging and increases the power supply time of the energy storage unit during discharging. When applied to DC power supply occasions, such as data centers or communication equipment, the AC-DC conversion circuit can be omitted, and directly connected to the power supply terminal of the DC power supply equipment to achieve the reliability of electronic equipment operation at a lower cost.

Description of drawings

Figure 1: A schematic diagram of a DC uninterruptible power supply circuit with an integrated charging and discharging circuit according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of a DC uninterruptible power supply circuit with an integrated charging and discharging circuit according to another preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1: DC uninterruptible power supply circuit with integrated charging and discharging circuit

11: AC-DC conversion circuit 12: First path switching circuit

13: The second path switching circuit 12a, 13a: The first contact

12b, 13b: the second contact 12c, 13c: the third contact

14: Integrated charge and discharge circuit 141: Charge and discharge control circuit

14a: Input end of the integrated charging and discharging circuit

14b: Output terminal of the integrated charging and discharging circuit

15: Energy storage unit 16: Operation control unit

162: Detection circuit 161: Operation controller

2: DC power supply equipment 3: Data center

L ₁ : first inductance D ₁ : first diode

Q ₁ : first switch C ₁ : first capacitor

C _o : Output capacitance R _s : Sense resistor

COM: common contact K: power supply output

K ₁ : the first connection terminal V _b : the voltage value of the energy storage unit

V _in : input power V _o : DC output power

V _s : detection voltage

Detailed ways

Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations therein are used as illustrations in nature rather than limiting the present invention. .

Please refer to FIG. 1 , which is a schematic diagram of a DC uninterruptible power supply circuit with an integrated charging and discharging circuit according to a preferred embodiment of the present invention. As shown in Figure 1, a DC uninterruptible power supply circuit 1 with an integrated charging and discharging circuit receives an input power V _in and provides an uninterrupted DC output power V _o at a power supply output terminal K, which includes: an AC-DC conversion circuit 11, The first path switching circuit 12 , the second path switching circuit 13 , the integrated charging and discharging circuit 14 , the energy storage unit 15 , the operation control unit 16 and the output capacitor C _o . Wherein, the AC-DC conversion circuit 11 is connected to the second contact point 12b of the first path switching circuit 12 and the power supply output terminal K to convert the AC input power V _in into a DC output power V _o , for example, a 110-volt AC The voltage value is converted to a DC voltage value of 12 volts. The output capacitor C _o is connected between the power supply output terminal K and the common point COM.

In this embodiment, the first path switching circuit 12 and the second path switching circuit 13 are composed of a relay (Relay), a bipolar junction transistor (Bipolar Junction Transistor, BJT) or a metal oxide semiconductor field effect transistor (Metal-Oxide- Semiconductor Field-Effect Transistor, MOSFET), but not limited thereto. The first contact 12a of the first path switching circuit 12 and the first contact 13a of the second path switching circuit 13 are respectively connected to the input end 14a and the output end 14b of the integrated charging and discharging circuit 14, and the second contact point 14b of the first path switching circuit 12 The contact 12b and the second contact 13b of the second path switching circuit 13 are connected to the power supply output terminal K, and the third contact 12c of the first path switching circuit 12 and the third contact 13c of the second path switching circuit 13 are connected to the energy storage unit 15 .

In addition to charging the energy storage unit 15 , the integrated charging and discharging circuit 14 can also transmit the electric energy discharged from the energy storage unit 15 to the power supply output terminal K through the integrated charging and discharging circuit 14 . In this embodiment, the integrated charging and discharging circuit 14 includes: a charging and discharging control circuit 141, a first inductor L ₁ , a first diode D ₁ , a first switch Q ₁ , a first capacitor C ₁ and a detection resistor R _s , wherein the first inductor _L1 is connected between the input terminal 14a of the integrated charging and discharging circuit 14 and the first connecting terminal _K1 , and the first diode _D1 is connected between the first connecting terminal _K1 and the integrated charging and discharging circuit. Between the output terminals 14b of the circuit 14, the first capacitor _C1 is connected between the output terminal 14b of the integrated charging and discharging circuit 14 and the common point COM, and the first switch _Q1 and the detection resistor _Rs are connected to the common point COM at the first connection terminal _K1 . The contacts COM are connected in series. The charge and discharge control circuit 141 is respectively connected to one end of the detection resistor R _s , the control end of the first switch _Q1 and the operation controller 161 of the operation control unit 16 to control the first switch _Q1 to be turned on or off. When the first switch Q ₁ is turned on, the current flowing through the detection resistor R _s will correspondingly generate a detection voltage V _s , and the charge and discharge control circuit 141 adjusts the duty cycle of the first switch Q ₁ to be turned on according to the detection voltage V _s (Duty cycle) size. Wherein, the first switch _Q1 may be, but not limited to, a bipolar junction transistor or a metal oxide semiconductor field effect transistor.

In this embodiment, the operation control unit 16 includes a detection circuit 162 and an operation controller 161, wherein the detection circuit 162 is respectively connected to the input end of the AC-DC conversion circuit 11 and the operation controller 161 to detect the input power V _in ( For example, the state of the mains). The operation controller 161 can be, but not limited to, a microprocessor (Micro Controller Unit, MCU) or a digital signal processor (Digital Signal Processors, DSP), which are respectively connected to the detection circuit 162, the control terminal of the first path switching circuit 12, The control terminal of the second path switching circuit 13 , the charging and discharging control circuit 141 and the energy storage unit 15 are used to control the operation of the DC uninterruptible power supply circuit 1 with an integrated charging and discharging circuit.

When the input power V _in is abnormal, such as interruption, too low voltage value, too high voltage value, too low frequency or too high frequency, the AC-DC conversion circuit 11 cannot output the DC output power V _o of the rated voltage value, and the operation control The device 161 will control the first path switching circuit 12 and the second path switching circuit 13 to switch paths, a conduction path is formed between the first contact 12a and the third contact 12c of the first path switching circuit 12, and the second path switching circuit 13 A conduction path is formed between the first contact 13a and the second contact 13b, so that the input terminal 14a and the output terminal 14b of the integrated charging and discharging circuit 14 are respectively connected to the energy storage unit 15 and the power supply output terminal K, whereby the energy storage unit 15 is discharged The electric energy can be transmitted to the power supply output terminal K through the integrated charging and discharging circuit 14 .

In this embodiment, when the input power V _in is abnormal, the operation controller 161 will control the operation of the integrated charging and discharging circuit 14 so that the electric energy discharged by the energy storage unit 15 is transmitted to the power supply output terminal K through the integrated charging and discharging circuit 14, The operation controller 161 also determines the operation mode of the integrated charging and discharging circuit 14 according to the voltage value V _b of the energy storage unit 15 .

In this embodiment, during the discharge process, when the voltage value V _b of the energy storage unit 15 is greater than the rated voltage value V _k of the DC output power source V _o (V _b >V _k ), the operation controller 161 controls the integrated charging The discharge circuit 14 operates in a pass-through mode, the first switch _Q1 is turned off, and the integrated charge and discharge circuit 14 does not boost the voltage V _b of the energy storage unit 15, but directly boosts the voltage V b of the energy storage unit 15. The voltage value V _b sequentially passes through the third contact 12c of the first path switching circuit 12, the first contact 12a of the first path switching circuit 12, the input terminal 14a of the integrated charging and discharging circuit 14, the first inductor L ₁ , the first The diode D ₁ , the output terminal 14b of the integrated charging and discharging circuit 14, the first contact 13a of the second path switching circuit 13, and the second contact 13b of the second path switching circuit 13 are transmitted to the power supply output terminal K to enable energy storage The electric energy discharged by the unit 15 is transmitted to the power supply output terminal K through the integrated charging and discharging circuit 14, at this time, the voltage value of the DC output power V _o is approximately equal to the voltage value V _b of the energy storage unit 15 (V _o = V _b ) (actually It is equal to the voltage value V _b of the energy storage unit 15 minus the forward conduction voltage value of 0.7 volts of the first diode D ₁ (V _o =V _b −0.7)). After discharge, when the voltage value V _b of the energy storage unit 15 is less than or equal to the first critical voltage value V _t1 (V _b <= V _t1 ), the operation controller 161 controls the integrated charging and discharging circuit 14 in the pulse width modulation mode ( PWM mode), the charging and discharging control circuit 141 controls the first switch _Q1 to be turned on and off in a pulse width modulation manner, and the integrated charging and discharging circuit 14 boosts the voltage value V _b of the energy storage unit 15 and then transmits it to the power supply At the output terminal K, the voltage value of the DC output power source V _o is greater than the voltage value V _b of the energy storage unit 15 (V _o >V _b ).

For example, when the input power V _in is abnormal, and the voltage V _b of the energy storage unit 15 and the rated voltage V _k of the DC output power V _o are 13 volts and 12 volts respectively (V _b >V _k ), The operation controller 161 controls the integrated charging and discharging circuit 14 to operate in the conduction mode, the first switch _Q1 is turned off, and the integrated charging and discharging circuit 14 does not boost the voltage value V _b of the energy storage unit 15, but directly boosts the voltage value V b of the energy storage unit 15. The voltage value V _b of 15 is directly transmitted to the power supply output terminal K through the integrated charging and discharging circuit 14 in sequence, so that the electric energy discharged by the energy storage unit 15 is transmitted to the power supply output terminal K through the integrated charging and discharging circuit 14. At this time, the DC output power The voltage value of V _o is approximately equal to 13 volts (V _o =V _b ), actually equal to 12.3 volts (V _o =V _b −0.7). After discharge, when the voltage value V _b of the energy storage unit 15 drops to the first critical voltage value V _t1 (V _b <= V _t1 ) of 12 volts, the operation controller 161 controls the integrated charging and discharging circuit 14 to pulse width modulation mode operation, the charging and discharging control circuit 141 controls the first switch _Q1 to be turned on and off in a pulse width modulation manner, and the integrated charging and discharging circuit 14 boosts the voltage value V _b of the energy storage unit 15 and then transmits it to the power supply output terminal K, the voltage value of the DC output power V _o at this moment is 12 volts [V _o >(V _b -0.7)].

When the input power V _{in is} normal, the AC-DC conversion circuit 11 will output a DC output power V _o of a rated voltage value, and the operation controller 161 will control the first path switching circuit 12 and the second path switching circuit 13 to switch paths, so that the first A conduction path is formed between the first contact 12a and the second contact 12b of the path switching circuit 12, and a conduction path is formed between the first contact 13a and the third contact 13c of the second path switching circuit 13, so that the integrated charging and discharging circuit 14 The input end 14a and the output end 14b of the power supply output end K and the energy storage unit 15 are respectively correspondingly connected.

In this embodiment, when the input power supply Vin _is normal, the operation controller 161 will control the integrated charging and discharging circuit 14 to charge the energy storage unit 15, wherein the operation controller 161 will also control the voltage value V _b of the energy storage unit 15 It is determined whether the integrated charging and discharging circuit 14 operates in a pulse width modulation mode to boost the voltage of the DC output power V _o and then transmit it to the energy storage unit 15 to charge the energy storage unit 15 .

In this embodiment, during the charging process, when the voltage value V _b of the energy storage unit 15 is lower than the voltage value of the DC output power source V _o (V _b <V _o ), the operation controller 161 controls The integrated charging and discharging circuit 14 operates in the conduction mode, the first switch Q ₁ is turned off, the integrated charging and discharging circuit 14 does not boost the voltage value of the DC output power V _o , but directly boosts the DC output power V _o through the first switch in sequence. The second contact 12b of a path switching circuit 12, the first contact 12a of the first path switching circuit 12, the input terminal 14a of the integrated charging and discharging circuit 14, the first inductor L ₁ , the first diode D ₁ , the integrated The output terminal 14b of the charging and discharging circuit 14, the first contact 13a of the second path switching circuit 13, and the third contact 13c of the second path switching circuit 13 are sent to the energy storage unit 15 to charge the energy storage unit 15, so that the energy storage unit 15 The amount of electricity and the voltage value V _b rise, and the voltage value V _b of the energy storage unit 15 in the charging state is approximately equal to the voltage value of the DC output power source V _o (V _b = V _o ) (actually equal to the voltage value of the DC output power source V _o The voltage value minus the forward conduction voltage value of the first diode D ₁ is 0.7 volts (V _b =V _o −0.7)). After continuous charging, when the voltage value V _b of the energy storage unit 15 is greater than or equal to the second critical voltage value V _t2 (V _b >= V _t2 ), the operation controller 161 controls the integrated charging and discharging circuit 14 to operate in the pulse width modulation mode , the charging and discharging control circuit 141 controls the first switch Q ₁ to be turned on and off in a pulse width modulation manner, and the integrated charging and discharging circuit 14 boosts the voltage value of the DC output power V _o and then transmits it to the energy storage unit 15 for storage The energy unit 15 is charged, and the voltage value V _b of the energy storage unit 15 in the charged state is greater than the voltage value of the DC output power source V _o (V _b >V _o ).

For example, when the input power V _in is normal, and the voltage value V _b of the energy storage unit 15 and the voltage value of the DC output power V _o are respectively 11 volts and 12 volts (V _b < V _o ), the operation controller 161 Control the integrated charging and discharging circuit 14 to operate in the conduction mode, the first switch Q1 is turned off, the integrated charging and discharging circuit 14 does not boost the voltage value of the DC output power V _o , but directly boosts the DC output power V _o through the integrated charging and discharging circuit 14. The discharge circuit 14 directly transmits to the energy storage unit 15 to charge the energy storage unit 15. At this time, the voltage value V _b of the energy storage unit 15 in the charged state is approximately equal to 12 volts (V _b = V _o ), actually equal to 11.3 volts (V _b = V _o -0.7). After continuous charging, when the voltage value V _b of the energy storage unit 15 rises to the second critical voltage value V _t2 of 12 volts (V _b >= V _t2 ), the operation controller 161 controls the integrated charging and discharging circuit 14 to pulse width modulation Mode operation, the charge and discharge control circuit 141 controls the first switch _Q1 to be turned on and off in a pulse width modulation manner, and the integrated charge and discharge circuit 14 boosts the voltage value of the DC output power V _o and then transmits it to the energy storage unit 15 The energy storage unit 15 is charged, and the voltage value V _b of the energy storage unit 15 in the charged state at this time is 13.7 volts (V _b >V _o ).

Please refer to FIG. 2 together with FIG. 1 , wherein FIG. 2 is a schematic diagram of a DC uninterruptible power supply circuit with an integrated charging and discharging circuit according to another preferred embodiment of the present invention. The difference between Fig. 2 and Fig. 1 is that the DC uninterruptible power supply circuit 1 with integrated charging and discharging circuit in Fig. 2 does not include the AC-DC conversion circuit 11, and the detection circuit 162 of the operation control unit 16 is respectively connected to the DC power supply device 2 The power supply terminal and the operation controller 161 are used to detect the state of the DC output power supply V _o provided by the DC power supply device 2; another difference lies in the second contact 12b of the first path switching circuit 12 of Fig. 2 and the second path switching The second contact 13b of the circuit 13 is connected to the power supply terminal of the DC power supply device 2 .

As shown in Figure 2, in this embodiment, the DC power supply device 2 directly provides the DC output power V _o to the data center 3 (it can also be other electronic equipment, such as communication equipment), and the DC power supply with integrated charging and discharging circuit does not The intermittent power supply circuit 1 is directly connected to the power supply terminal of the DC power supply device 2, and is used to discharge the energy storage unit 15 and provide electric energy to the power supply terminal of the DC power supply device 2 according to the state of the DC output power V _o provided by the DC power supply device 2 , or receive the electric energy of the DC output power V _o to charge the energy storage unit 15 .

In this embodiment, the detection circuit 162 is used to detect the state of the DC output power V _o . When the DC output power V _o is abnormal, the DC power supply device 2 cannot provide the DC output power V _o of the rated voltage value, the operation controller 161 will determine that the DC output power V _o is in an abnormal state through the detection circuit 162, and control the first path correspondingly The switching circuit 12 and the second path switching circuit 13 switch paths, so that a conduction path is formed between the first contact 12a and the third contact 12c of the first path switching circuit 12, and the first contact 13a of the second path switching circuit 13 and the second A conduction path is formed between the two contacts 13b. At this time, the input terminal 14a and output terminal 14b of the integrated charging and discharging circuit 14 are respectively connected to the energy storage unit 15 and the power supply terminal of the DC power supply device 2, whereby the energy storage unit 15 is discharged. The electric energy can be transmitted to the power supply end of the DC power supply device 2 through the integrated charging and discharging circuit 14 .

When the DC output power V _o is abnormal, the operation controller 161 will determine that the DC output power V _o is in a normal state through the detection circuit 162, and correspondingly control the operation of the integrated charging and discharging circuit 14 so that the electric energy discharged by the energy storage unit 15 passes through the integrated charging and discharging. The discharge circuit 14 transmits to the power supply end of the DC power supply device 2 , at this time, the operation controller 161 also determines the operation mode of the integrated charge and discharge circuit 14 according to the voltage value V _b of the energy storage unit 15 .

During the discharge process, when the voltage V _b of the energy storage unit 15 is greater than the rated voltage V _k of the DC output power V _o (V _b > V _k ), the operation controller 161 will control the integrated charging and discharging circuit 14 to conduct Mode operation, the first switch _Q1 is cut off, the integrated charging and discharging circuit 14 does not boost the voltage value V _b of the energy storage unit 15, but directly switches the voltage value V _b of the energy storage unit 15 through the first path in sequence The third contact 12c of the circuit 12, the first contact 12a of the first path switching circuit 12, the input terminal 14a of the integrated charging and discharging circuit 14, the first inductor L ₁ , the first diode D ₁ , the integrated charging and discharging circuit The output terminal 14b of 14, the first contact 13a of the second path switching circuit 13, and the second contact 13b of the second path switching circuit 13 are transmitted to the power supply terminal of the DC power supply device 2, so that the electric energy discharged by the energy storage unit 15 passes through the integrated The charging and discharging circuit 14 is sent to the power supply terminal of the DC power supply device 2, and the voltage value of the DC output power V _o is approximately equal to the voltage value V _b of the energy storage unit 15 (V _o =V _b ) (actually equal to the voltage value of the energy storage unit 15 The voltage value V _b of the first diode D ₁ is subtracted from the forward conduction voltage value of 0.7 volts (V _o =V _b −0.7)).

After discharge, when the voltage value V _b of the energy storage unit 15 is less than or equal to the first critical voltage value V _t1 (V _b <= V _t1 ), the operation controller 161 will control the integrated charging and discharging circuit 14 in the pulse width modulation mode In operation, the charging and discharging control circuit 141 will control the first switch _Q1 to be turned on and off in the manner of pulse width modulation, and the integrated charging and discharging circuit 14 will boost the voltage value V _b of the energy storage unit 15 and then transmit it to the DC power supply equipment 2, at this time the voltage value of the DC output power source V _o is greater than the voltage value V _b of the energy storage unit 15 (V _o > V _b ).

In summary, the DC uninterruptible power supply circuit with integrated charging and discharging circuit of the present invention uses a single integrated charging and discharging circuit to charge and discharge the energy storage unit when the input power is normal and abnormal, so the integrated charging and discharging circuit The DC uninterruptible power supply circuit of the discharge circuit has a small volume, a small number of parts, a low circuit complexity, and a low manufacturing cost. The integrated charge and discharge circuit can not only charge the energy storage unit when the input power is normal, but also When the input power supply is abnormal, the electric energy discharged by the energy storage unit can be transmitted to the output terminal of the power supply through the integrated charging and discharging circuit, so the circuit utilization rate is relatively high. In addition, when the integrated charging and discharging circuit is charging and discharging, the operation control unit determines the operating mode of the integrated charging and discharging circuit to be the conduction mode or the pulse width modulation mode according to the voltage value of the energy storage unit. Different from the traditional circuit, the operating mode increases The conduction mode with less power loss can improve the operating efficiency of the DC uninterruptible power supply circuit with an integrated charging and discharging circuit during charging, and on the other hand, can increase the power supply time of the energy storage unit during discharging. When applied to DC power supply occasions, such as data centers or communication equipment, the DC uninterruptible power supply circuit with integrated charging and discharging circuit of the present invention can omit the AC-DC conversion circuit 11, and be directly connected to the power supply terminal of the DC power supply device 2 , to achieve the reliability of electronic equipment operation at a lower cost.

Those skilled in the art should realize that changes and modifications made without departing from the scope and spirit of the present invention disclosed by the appended claims of the present invention are within the protection scope of the claims of the present invention.

Claims (21)

1. one kind has the integrated DC UPS circuit that charges and discharge circuit, and in order to receive an input power supply and to provide a continual direct current out-put supply at a power supply output, it comprises:

One AC-DC change-over circuit is connected in a power supply output and has contact altogether;

One energy-storage units is in order to store electrical energy;

One first via is directly switched circuit, is connected in this power supply output and this energy-storage units;

One second path commutation circuit is connected in this energy-storage units and this power supply output;

The one integrated circuit that charges and discharge, this is integrated to charge and discharge the input of circuit and output and is connected to this first via and directly switches circuit and this second path commutation circuit, with so that these energy-storage units charge or discharge; And

One operation control unit;

Wherein, when this input power source abnormality, this operation control unit is controlled this first via and is directly switched circuit and this second path commutation circuit toggle path, make this integrated input and corresponding respectively this energy-storage units and this power supply output of being connected in of output that charges and discharge circuit, and the electric energy of this energy-storage units discharge is sent to this power supply output via this integrated circuit that charges and discharge; And work as this input power supply just often, this operation control unit is controlled this first via and is directly switched circuit and this second path commutation circuit toggle path, make this integrated input and corresponding respectively this power supply output and this energy-storage units of being connected in of output that charges and discharge circuit, and this integrated circuit that charges and discharge is to this energy-storage units charging.

2. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, this operation control unit determines that according to the magnitude of voltage of this energy-storage units this integrated operational mode that charges and discharge circuit is a pulse-width-modulated mode or a conduction mode.

3. as claimed in claim 2 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, when the magnitude of voltage of this energy-storage units during greater than the load voltage value of this dc output power, the control of this operation control unit should integratedly charge and discharge circuit and move with this conduction mode, directly the magnitude of voltage of this energy-storage units is sent to this power supply output via this integrated circuit that charges and discharge.

4. as claimed in claim 3 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, when the magnitude of voltage of this energy-storage units is less than or equal to one first critical voltage value, the control of this operation control unit should integratedly charge and discharge circuit and move with this pulse-width-modulated mode, made this integrated charging and discharging be resent to this power supply output after circuit boosts the magnitude of voltage of this energy-storage units.

5. as claimed in claim 2 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, this operation control unit determines this integrated charging and discharging to be resent to this energy-storage units to this energy-storage units charging after whether circuit boosts the magnitude of voltage of this dc output power with this pulse-width-modulated mode operation according to the magnitude of voltage of this energy-storage units.

6. as claimed in claim 5 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, when the magnitude of voltage of this energy-storage units during less than the magnitude of voltage of this dc output power, this integrated circuit that charges and discharge of operation control unit control is with this conduction mode operation, directly this dc output power is sent to this energy-storage units to this energy-storage units charging via this integrated circuit that charges and discharge.

7. as claimed in claim 6 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, when the magnitude of voltage of this energy-storage units during more than or equal to one second critical voltage value, the control of this operation control unit should integratedly charge and discharge circuit with this pulse-width-modulated mode operation, made this integrated charging and discharging be resent to this energy-storage units after circuit boosts the magnitude of voltage of this dc output power this energy-storage units is charged.

8. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, also comprises an output capacitance, is connected in this power supply output and altogether between the contact.

9. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this first via directly switches circuit and this second path commutation circuit is realized by relay, bipolar junction transistor or mos field effect transistor.

10. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this operation control unit comprises:

One testing circuit is connected in the input of this AC-DC change-over circuit, in order to detect the state of this input power supply; And

One operation controller, be connected in this testing circuit, this first via and directly switch control end, the control end of this second path commutation circuit, this integrated circuit and this energy-storage units of charging and discharging of circuit, have the integrated DC UPS circuit operation that charges and discharge circuit in order to control this.

11. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this operation controller is microprocessor or digital signal processor.

12. as claimed in claim 1 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this integrated circuit that charges and discharge comprises:

One first inductance is connected between this integrated input and one first link that charges and discharge circuit;

One first diode is connected between the integrated output that charges and discharge circuit of this first link and this;

One first electric capacity is connected in this integrated output that charges and discharge circuit and altogether between the contact;

One detects resistance;

One first switch, this first switch and this detection resistance are connected in series between contact altogether at this first link and this; And

One charges and discharge control circuit, is connected in an end of this detection resistance, control end and this operation control unit of this first switch, in order to control this first switch conduction or to end;

Wherein when this first switch conduction, the corresponding generation one of electric current of flowing through this detection resistance detects voltage.

13. as claimed in claim 12 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this charges and discharge control circuit is adjusted this first switch conduction according to this detection voltage duty ratio size.

14. as claimed in claim 12 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that this first switch is bipolar junction transistor or mos field effect transistor.

15. one kind has the integrated DC UPS circuit that charges and discharge circuit, with to supply power to a direct current out-put supply of an electronic equipment uninterrupted so that flow power supply unit always, it comprises:

One energy-storage units is connected with contact altogether, in order to store electrical energy;

One first via is directly switched circuit, is connected in feeder ear and this energy-storage units of this dc suppling equipment;

One second path commutation circuit is connected in the feeder ear of this energy-storage units and this dc suppling equipment;

The one integrated circuit that charges and discharge, this is integrated to charge and discharge the input of circuit and output and is connected to this first via and directly switches circuit and this second path commutation circuit, with so that these energy-storage units charge or discharge; And

One operation control unit;

Wherein, when this dc output power is unusual, this operation control unit is controlled this first via and is directly switched circuit and this second path commutation circuit toggle path, make this integrated input and the corresponding respectively feeder ear that is connected in this energy-storage units and this dc suppling equipment of output that charges and discharge circuit, and the electric energy of this energy-storage units discharge integratedly charges and discharge the feeder ear that circuit is sent to this dc suppling equipment via this;

And work as this dc output power just often, this operation control unit is controlled this first via and is directly switched circuit and this second path commutation circuit toggle path, make this integrated input and corresponding respectively feeder ear and this energy-storage units that is connected in this dc suppling equipment of output that charges and discharge circuit, and this integrated circuit that charges and discharge is to this energy-storage units charging.

16. as claimed in claim 15 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, this operation control unit determines that according to the magnitude of voltage of this energy-storage units this integrated operational mode that charges and discharge circuit is a pulse-width-modulated mode or a conduction mode.

17. as claimed in claim 16 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, when the magnitude of voltage of this energy-storage units during greater than the load voltage value of this dc output power, the control of this operation control unit should integratedly charge and discharge circuit and move with this conduction mode, directly the magnitude of voltage of this energy-storage units is is integratedly charged and discharged the feeder ear that circuit is sent to this dc suppling equipment via this.

18. as claimed in claim 17 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in discharge process, when the magnitude of voltage of this energy-storage units is less than or equal to one first critical voltage value, the control of this operation control unit should integratedly charge and discharge circuit and move with this pulse-width-modulated mode, made this integrated feeder ear that is resent to this dc suppling equipment after circuit boosts the magnitude of voltage of this energy-storage units that charges and discharge.

19. as claimed in claim 16 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, this operation control unit determines this integrated charging and discharging to be resent to this energy-storage units to this energy-storage units charging after whether circuit boosts the magnitude of voltage of this dc output power with this pulse-width-modulated mode operation according to the magnitude of voltage of this energy-storage units.

20. as claimed in claim 19 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, when the magnitude of voltage of this energy-storage units during less than the magnitude of voltage of this dc output power, this integrated circuit that charges and discharge of operation control unit control is with this conduction mode operation, directly this dc output power is sent to this energy-storage units to this energy-storage units charging via this integrated circuit that charges and discharge.

21. as claimed in claim 20 have an integrated DC UPS circuit that charges and discharge circuit, it is characterized in that, in charging process, when the magnitude of voltage of this energy-storage units during more than or equal to one second critical voltage value, the control of this operation control unit should integratedly charge and discharge circuit with this pulse-width-modulated mode operation, made this integrated charging and discharging be resent to this energy-storage units after circuit boosts the magnitude of voltage of this dc output power this energy-storage units is charged.

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