CN101820176B - Modular uninterrupted power supply (UPS) and control method of charger thereof - Google Patents

Abstract

The invention relates to a control method for a modular UPS and a charger thereof. The modular UPS includes a battery and at least one charger, and the at least one charger is connected in parallel to charge the battery, and each charger performs the following steps after being turned on: A . Detect the charging voltage and charging current of itself; B. Judging whether the detected charging voltage is greater than the preset first voltage value, and whether the charging current is less than the preset first current value, if so, proceed to step C; C . Judging whether the charger is a pre-set main charger, if not, turning off the charger. Implementing the control method of the modularized UPS and its charger of the present invention can make the chargers of each module in the modularized UPS connected in parallel to charge the battery, and has a simple structure.

Description

A control method for modular UPS and its charger

technical field

The invention relates to a UPS power supply, more specifically, to a control method for a modularized UPS and a charger thereof.

Background technique

UPS (Uninterruptible Power Supply, uninterruptible power supply) is widely used in many industries such as telecommunications, finance, government, and manufacturing. work or loss of data. In computer systems and network applications, it mainly plays two roles: one is emergency use, preventing sudden power failure from affecting normal work and causing damage to the computer; "Power supply pollution" such as low voltage, wire noise, and frequency offset improves power quality and provides high-quality power for computer systems.

In the traditional UPS configuration, one UPS is equipped with a set of batteries. In charging mode, a charger can charge a set of batteries.

Modular UPS can be removed and installed at will without affecting the operation and output of the system when the system is running, so it has the advantages of high power quality, high power availability, easy expansion, easy maintenance, safety and reliability, and low operating cost. One of the directions of development. In a modular UPS, each module has a charger, but usually only one set of batteries is configured, so the modular UPS cannot charge the battery, and how to use the modular UPS to charge the battery has become an urgent problem to be solved.

Contents of the invention

The technical problem to be solved by the present invention is to provide a control method for a modular UPS and its charger. Using the modular UPS and the method to charge the battery can solve the problem of the modular UPS charging the battery, and has a simple structure.

The technical solution adopted by the present invention to solve the technical problem is: to construct a control method for a charger of a modular UPS, the modular UPS includes at least one charger, and the at least one charger is connected in parallel to charge the battery, and each charger After the device is turned on, perform the following steps:

A. Detect its own charging voltage and charging current;

B. Judging whether the detected charging voltage is greater than the preset first voltage value, and whether the charging current is smaller than the preset first current value, if so, then perform step C;

C. Judging whether the charger is the pre-set main charger, if not, shutting down the charger.

In the control method of the charger of modularized UPS according to the present invention, after step A, it also includes:

D. Judging whether the detected charging current is less than the preset second current value, if so, proceed to the following steps;

E. Turn off the charger once every first time, and the closing time is the second time;

F. Detect the terminal voltage of the battery in the second time;

G. Determine whether the detected battery port voltage is lower than one-third of the normal voltage of the battery, and if so, issue an alarm that the battery does not exist.

In the control method of the charger of modularized UPS according to the present invention, after step A, it also includes:

H. Judging whether the detected charging current is higher than the current limiting value, if so, then reduce the charging voltage; if not, then gradually increase the charging voltage until the battery allows the maximum charging voltage, and the current limiting value is the maximum charging current of the battery and The ratio of the number of chargers.

In the method for controlling the charger of the modularized UPS according to the present invention, the detected charging voltage of the charger is not greater than the preset first voltage value, and the charging current is not less than the preset first current value, then the switch to Step A.

In the method for controlling the charger of a modular UPS according to the present invention, if the judgment result of step C is that the charger is the main charger, go to step A.

In the method for controlling a charger of a modular UPS according to the present invention, if it is judged that the detected charging current is not less than the preset second current value, go to step A.

In the method for controlling the charger of the modularized UPS according to the present invention, if it is judged that the detected battery port voltage is not lower than one-third of the normal voltage of the battery, go to step A.

In the method for controlling a charger of a modular UPS according to the present invention, the first time is at least ten times the second time.

The present invention also constructs a modular UPS, including at least one charger, and the at least one charger is connected in parallel to charge the battery, and each charger includes a first detection unit, a first judging unit, a transformer unit, a second The judging unit, the third judging unit and the first switching unit, wherein,

The first detection unit is used to detect the charging voltage and charging current of the charger in real time;

The first judging unit is used to judge whether the detected charging current is higher than the current limit value, and the current limit value is the ratio of the maximum charging current of the battery to the number of chargers;

The voltage transformation unit is used to reduce the charging voltage when it is judged that the detected charging current is higher than the current limit value, and gradually increase the charging voltage when it is judged that the detected charging current is not higher than the current limit value, until the battery allows the maximum charging voltage;

The second judging unit is used to judge whether the detected charging voltage is greater than a preset first voltage value, and whether the charging current is smaller than a preset first current value;

The third judging unit is used to judge whether the charger is a preset main charger when the second judging unit judges that the detected charging voltage is greater than the preset first voltage value and the charging current is smaller than the preset first current value. charger;

The first switch unit is configured to turn off the charger when the third judging unit judges that the charger is not a preset main charger.

In the modularized UPS of the present invention, each charger further includes: a fourth judgment unit, a second switch unit, a battery detection unit, a battery judgment unit and an alarm unit, wherein,

A fourth judging unit, configured to judge whether the detected charging current is less than a preset second current value;

The second switch unit is configured to turn off the charger every first time when the fourth judging unit judges that the detected charging current is less than the preset second current value, and the shutdown time is the second time;

The battery detection unit is used to detect the terminal voltage of the battery within a second time;

The battery judging unit is used to judge whether the detected battery port voltage is lower than one-third of the normal voltage of the battery;

The alarm unit is used to send an alarm when the detected voltage of the battery port is lower than one-third of the normal voltage of the battery.

Implementing the control method of the modularized UPS and its charger of the present invention can make the chargers of each module in the modularized UPS connected in parallel to charge the battery, and has a simple structure.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a structural schematic diagram of the first embodiment of the modularized UPS and the configured battery of the present invention;

Fig. 2 is a logic structure diagram of embodiment 1 of the charger of the modularized UPS of the present invention;

FIG. 3 is a flow chart of Embodiment 1 of a charger control method for a modular UPS of the present invention.

Detailed ways

As shown in Figure 1, in the structural schematic diagram of the first embodiment of the modularized UPS and the configured battery of the present invention, the modularized UPS charges the battery 200, the modularized UPS includes a cabinet 100, and the cabinet 100 is provided with modules 110, 120, ..., 130, each module has a charger, respectively chargers 111, 121, ..., 131, chargers 111, 121, ..., 131 are connected in parallel to charge the battery 200, and in Switches K1 , K2 , .

Fig. 2 is a logic structure diagram of a charger embodiment 1 in the modularized UPS of the present invention, as shown in the figure, the charger 111 includes a first detection unit 111-0, a first judgment unit 111-1, a second judgment unit 111-2, the third determination unit 111-3, the first switch unit 111-4, the fourth determination unit 111-5, the second switch unit 111-6, the battery detection unit 111-7, the battery determination unit 111-8, Alarm unit 111-9 and voltage transformation unit 111-10.

Wherein, the first detection unit 111-0 is used to detect the charging voltage and charging current of the charger in real time;

The first judging unit 111-1 is used to judge whether the detected charging current is higher than the current limit value, and the current limit value is the ratio of the maximum charging current of the battery to the number of chargers;

The voltage transformation unit 111-10 is used to reduce the charging voltage when it is judged that the detected charging current is higher than the current limit value, and gradually increase the charging voltage when it is judged that the detected charging current is not higher than the current limit value until the battery allows maximum charging Voltage;

The second judging unit 111-2 is used to judge whether the detected charging voltage is greater than the first voltage value, and whether the charging current is smaller than the first current value, wherein the setting of the first voltage value and the first current value can be based on actual conditions To determine, such as the number of battery cells allowed, capacity, etc.;

The third judging unit 111-3 is used to judge whether the charger is a preset main charger when the second judging unit judges that the detected charging voltage is greater than the first voltage value and the charging current is smaller than the first current value;

The first switch unit 111-4 is configured to turn off the charger when the third judging unit judges that the charger is not a preset main charger;

A fourth judging unit 111-5, configured to judge whether the detected charging current is less than the second current value;

The second switch unit 111-6 is configured to turn off the charger once every first time when the fourth judgment unit judges that the detected charging current is less than the second current value, and the shutdown time is the second time;

A battery detection unit 111-7, configured to detect the terminal voltage of the battery within a second time;

A battery judging unit 111-8, configured to judge whether the detected battery port voltage is lower than one-third of the normal voltage of the battery;

The alarm unit 111-9 is configured to issue an alarm when the detected battery terminal voltage is lower than one-third of the normal voltage of the battery.

It should be noted that the logic structure of the chargers 121 and 131 is the same as the logic structure of the charger 111 described above, and will not be repeated here.

Fig. 3 is the flow chart of the charger control method of modularized UPS of the present invention, and this modularized UPS comprises at least one charger, and described at least one charger is connected in parallel to charge battery, and each charger performs the following steps after being turned on:

Step S101. Detect its own charging voltage and charging current. Ideally, the charging current of each charger connected in parallel is equal, but in fact, each charger cannot work. Under ideal conditions, each charger naturally shares the current, and then Step S102, step S103 and step S106 can be carried out simultaneously;

Step S102. Judging whether the detected charging current is higher than the current limit value, if so, go to step S111; if not, go to step S112 at the same time;

Step S111. Lower the charging voltage, and then go to step S101;

Step S112. Gradually increase the charging voltage until the battery allows the maximum charging voltage, and then go to step S101;

Step S103. Determine whether the detected charging voltage is greater than the first voltage value, and whether the charging current is less than the first current value, if so, go to step S104; if not; go to step S101, wherein the first voltage value and the first current value The settings can be determined according to the actual situation, such as the number of battery cells allowed, capacity, etc.;

Step S104. Determine whether the charger is a preset main charger, if so, go to step S101; if not, go to step S105;

Step S105. Turn off the charger;

Step S106. Judging whether the detected charging current is less than the second current value, if so, then go to step S107; if not, then go to step S101;

Step S107. Turn off the charger every first time, and the closing time is the second time, wherein the first time is much longer than the second time, for example, the first time is at least ten times the second time;

Step S108. Detect the terminal voltage of the battery within a second time;

Step S109. Determine whether the terminal voltage of the battery is lower than one-third of the normal voltage of the battery, if yes, go to step S110; if not, go to step S101.

Above is just an embodiment of the present invention, is not intended to limit the present invention, for example, after step S101, step S102 and subsequent steps thereof (step S111, S112), step S103 and subsequent steps thereof (S104, S105), step S106 And its subsequent steps (S107, S108, S109, S110) can be carried out simultaneously, also can carry out sequentially, the order of execution can be: first carry out step S102 and its subsequent steps, then carry out step S103 and its subsequent steps, finally carry out step S106 and its subsequent steps; the order of execution may also be: first perform step S102 and its subsequent steps, then perform step S106 and its subsequent steps, and finally perform step S103 and its subsequent steps. For example, the above method does not limit the magnitude relationship between the first current value and the second current value. In the first case, that is, when the first current value is greater than the second current value, after detecting its own charging voltage and charging current in step S101, if the charging current is between the first current value and the second current value, Execute step S103 to step S105, that is, as the battery is more and more fully charged, non-main chargers are gradually turned off, and the main charger executes step S106 to step S110 to determine whether the battery exists. In the second case, that is, the first current value is not greater than the second current value, after detecting its own charging voltage and charging current in step S101, if the charging current is between the first current value and the second current value, charging The charger first performs step S106 to step S110, that is, it starts to shut down intermittently before stopping charging. If all the chargers are synchronized at this time, it can be judged whether the battery exists by detecting the port voltage of the battery when all the chargers are turned off. ; If all the chargers are not fully synchronized at this time, only when the charging current of the non-main chargers is less than the first current value, step S102 to step S105 is executed, that is, all non-main chargers stop charging before detection Whether the battery is present.

The charging method of the battery in the UPS is described below with reference to FIG. 1 and FIG. 2 . First, the charger 111 is set as the main charger, and it is assumed that the first current value I1 is greater than the second current value I2 . For the charger 121, in the charging mode, assuming that the battery is low, the switch K2 is closed, and the charger 121 is in the working state. Then, the first detection unit of the charger 121 starts to detect its own charging voltage V _chg2 and charging current I _chg2 , and then the first judging unit of the charger 121 judges whether its charging current I _chg2 is higher than the current limit value, if higher than the limit If the current value is lower than the current limit, the transformer unit reduces the charging voltage; if it is not higher than the current limit value, the transformer unit gradually increases the charging voltage until the battery allows the maximum charging voltage. At the same time, compare V _chg2 with V1 and I _chg2 with I1, I _chg2 and I2, where V1 is the first voltage value, I1 is the first current value, and I2 is the second current value. When the battery is in a low state, the result of the judgment of the second judging unit is V _chg2 < V1 and I _chg2 > I1, and the judgment result of the third judging unit is I _chg2 > I2. At this time, the charger 121 continues to charge and detect Its own charging voltage and charging current. After charging for a period of time, the battery becomes more and more full. When the charging current I _chg2 satisfies the relationship of I2<I _chg2 <I1, the second judging unit of the charger 121 judges that V _chg2 >V1 and I _chg2 <I1, and the second Three Judgments The judging unit judges that the charger 121 is not the main charger, and then its first switch unit turns off the charger 121 . In the same way, if the first judging unit of the charger 131 judges that V _chg3 >V1 and I _chg3 <I1, and its second judging unit judges that the charger 131 is not the main charger, then its first switch unit turns off the charger. 131. By analogy, when the battery is getting fuller, all chargers except the main charger are gradually turned off.

For the main charger 111, in the charging mode, the first detection unit 111-0 of the charger 111 starts to detect its own charging voltage V _chg1 and charging current I _chg1 , and the first judging unit 111-1 starts to judge its charging current I _chg1 Whether it is higher than the current limit value, if not higher, the voltage transformation unit 111-10 gradually increases the charging voltage, if higher, then lowers the charging voltage, and at the same time, compare V _chg1 and V1 and I _chg1 and I1, I _chg1 and I2 , when the battery is low, the result of the judgment of the second judging unit 111-2 is V _chg1 < V1 and I _chg1 > I1, and the judgment result of the fourth judging unit 111-5 is I _chg1 > I2, and the charger 111 continues to Charge, and continue to detect its own charging voltage and charging current. As charging continues, the battery is more and more full. When the charging current I _chg1 satisfies the relationship of I2<I _chg1 <I1, the second judging unit 111 of the charger 111 The results of the -2 judgment are V _chg1 > V1 and I _chg1 < I1, and the third judging unit judges that the charger 111-1 is the main charger, and continues to detect its own charging voltage and charging current until the charger 111's first The fourth judging unit 111-5 judges that I _chg1 <I2, and the second switching unit 111-6 turns off the charger once every first time, and the closing time is the second time, for example, every minute is turned off for 1 second, and in Within 1 second of shutting off, the battery detection unit 111-7 detects the port voltage of the battery, and finally, the battery judgment unit 111-8 judges whether the detected battery port voltage is lower than one-third of the charging voltage, and if so, the alarm unit 111-9 alerts the user that the battery is not present.

The above only illustrates the case where the first current value I1 is greater than the second current value I2, and the method for the case where the first current value I1 is not greater than the second current value I2 is similar, and can be charged when the charging current is smaller than the smallest one of I1 and I2. When it is judged whether the battery exists, but in the case that the first current value I1 is not greater than the second current value I2, when the charging current of the charger is between the first current value and the second current value, and all the chargers are Battery presence is also detected when syncing.

When the modular UPS shares a set of batteries, some modules will be powered by the mains input and some modules will be powered by the battery. If one module enters the battery power supply mode, the chargers of all other modules will be turned off.

It should be noted that there is no special requirement for the setting of the main charger, and the judgment rules can be set arbitrarily during product design. When the main charger quits charging due to failure or some reason, the main charger can be regenerated in the original non-main charger.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (9)

1. The control method of the charger of a kind of modularized UPS, this modularized UPS comprises at least one charger, it is characterized in that, described at least one charger is connected in parallel for battery charging, and each charger carries out following steps after opening: A. Detect its own charging voltage and charging current; B. Judging whether the detected charging voltage is greater than the preset first voltage value, and whether the charging current is smaller than the preset first current value, if so, then perform step C; C. Determine whether the charger is the pre-set main charger, if not, turn off the charger; After step A also include: H. Judging whether the detected charging current is higher than the current limiting value, if so, then reduce the charging voltage; if not, then gradually increase the charging voltage until the battery allows the maximum charging voltage, and the current limiting value is the maximum charging current of the battery and The ratio of the number of chargers. 2. the control method of the charger of modularized UPS according to claim 1, is characterized in that, after step A, also comprises: D. Judging whether the detected charging current is less than the preset second current value, if so, proceed to the following steps; E. Turn off the charger once every first time, and the closing time is the second time; F. Detect the terminal voltage of the battery in the second time; G. Determine whether the detected battery port voltage is lower than one-third of the normal voltage of the battery, and if so, issue an alarm that the battery does not exist. 3. The method for controlling a charger of a modular UPS according to claim 1, wherein when the detected charging voltage of the charger is not greater than the preset first voltage value, and the charging current is not less than the preset first A current value, then execute step A. 4 . The method for controlling the charger of the modularized UPS according to claim 2 , wherein, if the judgment result of the step C is that the charger is the main charger, go to step A. 5 . 5. The method for controlling the charger of the modularized UPS according to claim 2, wherein if the detected charging current is not less than the preset second current value, go to step A. 6. The method for controlling the charger of the modularized UPS according to claim 2, wherein if the detected battery port voltage is not lower than one-third of the normal voltage of the battery, go to step A. 7. The method for controlling a charger of a modular UPS according to claim 2, wherein the first time is at least ten times the second time. 8. A modular UPS, comprising at least one charger, characterized in that the at least one charger is connected in parallel to charge the battery, and each charger includes a first detection unit, a first judgment unit, a transformer unit, The second judging unit, the third judging unit and the first switching unit, wherein, The first detection unit is used to detect the charging voltage and charging current of the charger in real time; The first judging unit is used to judge whether the detected charging current is higher than the current limit value, and the current limit value is the ratio of the maximum charging current of the battery to the number of chargers; The voltage transformation unit is used to reduce the charging voltage when it is judged that the detected charging current is higher than the current limit value, and gradually increase the charging voltage when it is judged that the detected charging current is not higher than the current limit value, until the battery allows the maximum charging voltage; The second judging unit is used to judge whether the detected charging voltage is greater than a preset first voltage value, and whether the charging current is smaller than a preset first current value; The third judging unit is used to judge whether the charger is a preset main charger when the second judging unit judges that the detected charging voltage is greater than the preset first voltage value and the charging current is smaller than the preset first current value. charger; The first switch unit is configured to turn off the charger when the third judging unit judges that the charger is not a preset main charger. 9. The modularized UPS according to claim 8, wherein each charger further comprises: a fourth judgment unit, a second switch unit, a battery detection unit, a battery judgment unit and an alarm unit, wherein, A fourth judging unit, configured to judge whether the detected charging current is less than a preset second current value; The second switch unit is configured to turn off the charger every first time when the fourth judging unit judges that the detected charging current is less than the preset second current value, and the shutdown time is the second time; The battery detection unit is used to detect the terminal voltage of the battery within a second time; The battery judging unit is used to judge whether the detected battery port voltage is lower than one-third of the normal voltage of the battery; The alarm unit is used to send an alarm when the detected voltage of the battery port is lower than one-third of the normal voltage of the battery.

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