TWM646014U - DC power supply system - Google Patents

Abstract

A DC power supply system is electrically connected to an external first power supply, a second power supply and a load. The DC power supply system includes a main power supply module, a backup power supply module, an energy storage power supply module and A control unit. The control unit also includes a power detection module adapted to detect the voltages of the main power module, the backup power module and the energy storage power module, and select those whose voltages meet a normal range for power supply. The control unit also includes a logic operation module adapted to control the energy storage power supply module, causing the energy storage power supply module to discharge the reactance module, and measuring the voltage of the energy storage power supply module to drop below a battery level. A discharge time of the limit value. The control unit is also adapted to compare the discharge time with a preset time and generate battery evaluation data.

Description

DC power supply system

A power supply, in particular a DC power supply system for a switchboard.

Capacitive trip device (CTD) is a device that assists the switchboard protection system. Its purpose is to avoid subsequent device damage caused by normal power system failures or sudden power outages and high voltages. The principle is that when the power supply of the power supply is interrupted, the power of the capacitor in the capacitor trip device supplies power to the switchboard protection system, so that the switchboard protection system can disconnect the switchboard from the power supply and protect the switchboard and subsequent devices.

Capacitive trip devices can provide temporary power to allow switchboard protection devices to disconnect normally during a power outage, but they cannot provide sufficient power to maintain the operation of subsequent devices. Uninterruptible power supply systems (UPS) can provide power for a longer period of time after a power outage, and subsequent devices on the switchboard can provide temporary power to maintain operations. However, the battery itself has a short lifespan and has the disadvantages of self-discharge and degradation. The uninterruptible power supply system is an emergency backup system and has a low usage rate. In this case, the battery is also easily damaged.

Therefore, how to solve the above problems is worthy of consideration by those with ordinary knowledge in this field.

This creation provides a DC power supply system that uses lithium batteries as a temporary power supply source during power outages, and has a mechanism for battery activation and battery health detection to ensure battery availability. Avoid battery failure due to low usage. The specific technical means are as follows:

A DC power supply system is electrically connected to an external first power supply, a second power supply and a load. The DC power supply system includes a main power module, a backup power module, a charging module, and a storage module. It consists of a power supply module, a reactance module, a protection module, a control unit, a regulated output module and a light module. The main power module is electrically connected to the external first power supply. The backup power module is electrically connected to the external second power supply. The charging module is coupled to the main power module. The energy storage power module is coupled to the charging module. The reactance module is coupled to the energy storage power supply module. The protection module is disposed between the charging module and the energy storage power supply module, and is suitable for detecting the voltage of the energy storage power supply module, and switching off or on according to the voltage of the energy storage power supply module. The control unit is coupled to the main power module, the backup power module, the energy storage power module, the reactance module and the charging module. The voltage stabilizing output module is electrically connected to the control unit and the load, and is suitable for converting the voltage from the control unit into a voltage of a specific value and transmitting it to the load. The light module is coupled to the control unit. Wherein, the control unit also includes a power detection module, which is suitable for detecting the voltage of the main power module, the backup power module and the energy storage power module, and selecting the one with the highest voltage to supply power to the load. . Wherein, the control unit also includes an abnormality judgment module, suitable for detecting the voltage of the main power module, the backup power module and the energy storage power module. When the main power module, the backup power module If the voltage of the energy storage power module does not match a normal range, a control signal is sent to the light module. Wherein, the control unit also includes a logic operation module, suitable for controlling the energy storage power supply module, causing the energy storage power supply module to discharge the reactance module, and measuring the voltage of the energy storage power supply module to reduce to A discharge time for the lower limit of a battery. Wherein, the control unit is also adapted to compare the discharge time with a preset time and generate battery evaluation data.

The above-mentioned DC power supply system also includes a maintenance isolating switch. The main power module, the energy storage power module and the backup power module are coupled to the control unit through the maintenance isolating switch.

The above-mentioned DC power supply system also includes a plurality of AC-DC converters, respectively coupled between the main power module and the maintenance isolating switch, and between the backup power module and the maintenance isolating switch; wherein, the The charging module is electrically connected to the main power module through the AC-DC converter.

The above-mentioned DC power supply system also includes a plurality of boost converters, respectively coupled between the AC-DC converter and the maintenance isolating switch, between the energy storage power supply module and the maintenance isolating switch, and between the AC and DC converters. Between the DC converter and the maintenance isolating switch.

As in the above-mentioned DC power supply system, when the voltage of the main power module does not meet the normal range, the control unit selects the energy storage power module to supply power to the load.

As in the above DC power supply system, when the voltages of the main power module and the energy storage power module are lower than the normal range, the control unit turns on and selects the backup power module to power the load.

As in the above DC power supply system, when the voltage of the energy storage power supply module is lower than a battery measurement value, the control unit turns on the connection between the charging module and the energy storage power supply module.

The above-mentioned DC power supply system also includes a status contact module connected to the control component.

10:First power supply

20:Second power supply

30:Load

100: DC power supply system

110: Main power module

120: Energy storage power module

130: Backup power module

140:Control unit

141: Repair isolating switch

142:Connection port

150: Stabilized output module

151:Power detection module

152: Logic operation module

153: Abnormality judgment module

154:Discharge module

155: Power supply parallel anti-reverse module

156: Overload protection module

157: Communication monitoring module

160: AC to DC converter

170, 170a~170c: Boost conversion module

180: Status contact module

190:Lamp module

Figure 1 shows a schematic structural diagram of the DC power supply system 100 of the present invention.

Figure 2 shows a schematic diagram of the control unit.

Please refer to FIG. 1 , which is a schematic structural diagram of the DC power supply system 100 of the present invention. The DC power supply system 100 of the present invention is electrically connected to the external first power supply 10 , the second power supply 20 and the load 30 . The first power supply 10 is, for example, a power supply provided by a power company or a DC power supply system, which is usually an AC/DC 85~264V±10% 50/60Hz power supply. The second power supply 20 is, for example, a backup power supply system installed in a field (such as a building, etc.), such as an uninterruptible power supply system. Load 30 is the equipment that needs power supply.

The DC power supply system 100 of this invention includes a main power module 110, an energy storage power module 120, a backup power module 130, a control unit 140, a maintenance isolation switch 141, a voltage-stabilized output module 150, A plurality of AC to DC converters 160, a plurality of boost converters 170, a status contact module 180 and a light module 190.

The main power module 110 , the backup power module 130 and the regulated output module 150 are external connection terminals of the DC power supply system 100 . Among them, the main power module 110 is connected to the first power supply 10 , the backup power module 130 is connected to the second power supply 20 , and the regulated output module 150 is connected to the load 30 . In other words, the voltage stabilizing output module 150 is the output terminal of the DC power supply system 100 and is suitable for stabilizing the voltage from the main power module 110, the energy storage power module 120 or the backup power module 130, and outputting it to the external load 30 (electrical equipment). The energy storage power module 120 is a battery, such as a lithium battery. When the battery is fully charged, it can operate continuously for more than 30 minutes with an output power of 30W. In one embodiment, the output voltage of the voltage-stabilizing output module 150 is DC110V±10%. Even when the energy storage power supply module 120 supplies power, the output voltage of the voltage-stabilizing output module 150 is still DC110V±10%.

The control unit 140 is coupled to the main power module 110 , the energy storage power module 120 , the backup power module 130 and the regulated output module 150 . In other words, the control unit 140 is connected between the voltage stabilizing output module 150 and each power supply, and the control unit 140 selects a suitable power output from the main power supply module 110, the energy storage power supply module 120, and the backup power supply module 130. to the voltage stabilizing output module 150 to supply power to the load 30 . Its specific operation method will be described later.

The maintenance isolation switch 141 is connected between the control unit 140 and each power supply. That is to say, the main power module 110 , the backup power module 130 and the regulated output module 150 are all connected to the control unit 140 through the maintenance isolation switch 141 . The maintenance isolation switch 141 is suitable for opening or closing the connection between the control unit 140 and the energy storage power module 120 . The purpose is to connect the first power supply 10 and the second power supply when the load 30 needs maintenance. When the source 20 is turned off, the energy storage power supply module 120 will provide power at this time. Therefore, the connection between the load 30 and the energy storage power supply module 120 can be cut off through the maintenance isolation switch 141 to ensure that the load 30 is isolated from the power supply for subsequent convenience. Maintenance work and safety.

A plurality of AC-DC converters 160 are respectively connected between the main power module 110 and the maintenance isolation switch 141, and between the backup power module 130 and the maintenance isolation switch 141. The AC-DC converter 160 is adapted to receive the voltage from the main power module 110 or the backup power module 130 and convert it into a DC voltage. The plurality of boost converters 170 are respectively connected between the main power module 110 and the maintenance isolation switch 141, between the energy storage power module 120 and the maintenance isolation switch 141, and between the backup power module 130 and the maintenance isolation switch 141. between. To further explain, the boost converter 170 is connected between the AC-DC converter 160 and the maintenance isolation switch 141 . The boost converter 170 is suitable for boosting the voltages from the main power module 110 , the backup power module 130 and the energy storage power module 120 to a voltage suitable for the load 30 . Specifically, there are three boost converters 170 in total, corresponding to the autonomous power module 110, the backup power module 130 and the energy storage power module 120, and the three boost converters 170 output according to the corresponding power supply. Voltage is also different. In this embodiment, the output voltage of the boost converter 170a is greater than the output voltage of the boost converter 170b, and the output voltage of the boost converter 170b is greater than the output voltage of the boost converter 170c.

The DC power supply system 100 also includes a charging module 122, a protection module 121 and a reactance module 123. The charging module 122 is coupled between the main power module 110 and the energy storage power module 120. The protection module The group 121 is connected between the charging module 122 and the energy storage power supply module 120 . Among them, the charging module 122 is connected to the main power module 110 through the AC-DC converter 160, and obtains the voltage from the AC-DC converter 160, and converts it into a voltage value suitable for the energy storage power module 120. to charge. The protection module 121 is suitable for detecting the voltage value of the energy storage power supply module 120, and switching on or off according to the voltage value of the energy storage power supply module 120, for example, when the voltage value of the energy storage power supply module 120 is too high or Switches to off-circuit state when too low state to protect the energy storage power module 120 from overcharging or overdischarging. The reactance module 123 is connected to the energy storage power supply module 120. The reactance module 123 is an impedance element with a fixed resistance value.

The status contact module 180 is provided on the control unit 140. The status contact module 180 is an external contact, such as a European-style terminal block. The status contact module 180 corresponds to specific components in the DC power supply system 100, and changes the status of the status contact module 180 according to the status of these components, such as on or off, to represent the status of the component. For example, when the voltage of the main power module 110 is too low, the corresponding status contact module 180 will be switched to open circuit, and the external device can use the status of the status contact module 180 to further react. Therefore, the control unit 140 can be connected to other external devices, such as warning lights, buzzers, or other monitoring equipment, through the status contact module 180 .

The light module 190 is connected to the control unit 140 . Specifically, the light module 190 includes a plurality of lamps of different colors, which is suitable for receiving signals from the control unit 140 and turning on or off the corresponding lamps to express the status of the DC power supply system 100 by emitting light from the lamps. . Specifically, in this embodiment, the light module 190 includes a total of 5 groups of lamps, which are used to represent the main power status, the backup power status, the battery status, the battery health and the device status, through constant light, extinguishing, flashing, Color and other display methods are used to indicate the status of different blocks. For example, if the main power status lamp is always on, it means that the main power output is normal, and if it goes out, it means that the main power output is abnormal. The functional modules of the control unit 140 are described below.

Please refer to Figure 2, which is a schematic diagram of the control unit. The control unit 140 is, for example, a microcontroller unit (MCU for short), which can perform automated digital logic control. In this embodiment, the control unit 140 includes a power detection module 151, a logic operation module 152, an abnormality judgment module 153, a discharge module 154, a power supply parallel anti-reverse module 155, an overload Protection module 156 and a communication monitoring module 157. Among them, the power detection module 151, the logic operation module 152, the abnormal The judgment module 153, the discharge module 154 and the communication monitoring module 157 are stored in the control unit 140 in the form of programs.

The power detection module 151 is suitable for detecting the voltages of the main power module 110, the energy storage power module 120 and the backup power module 130, and determining the main power module 110, the energy storage power module 120 and the backup power module. Is the voltage of 130 within a normal range? Further, the one whose voltage meets the normal range is selected from the main power module 110, the energy storage power module 120 and the backup power module 130 for conduction. If the voltages of the main power module 110, the energy storage power module 120 and the backup power module 130 all meet the normal range, then the one with the highest voltage is selected for conduction. If only the voltages of the energy storage power module 120 and the backup power module 130 meet the normal range, the energy storage power module 120 is selected for conduction. In addition, if the voltage of the energy storage power module 120 is lower than a battery measured value, the power detection module 151 will turn on the charging module 122 and the energy storage power module 120, and the main power module 110 will control the energy storage power module. The group 120 is charged until the energy storage power module 120 reaches the charging target voltage. The battery measurement value and the charging target voltage are determined according to the battery specifications. In this embodiment, the battery measurement value is, for example, 12V, and charging is stopped after the energy storage power module 120 is charged to 16.0V.

In other words, the power detection module 151 will select the one with a higher power supply voltage from the main power module 110, the energy storage power module 120 and the backup power module 130 to supply power to the load 30. When all power supplies are normal, Then the main power module 110 with the highest voltage will be selected first to supply power to the load 30 . When the main power supply is abnormal, the energy storage power supply module 120 is selected first. When both the main power supply and the energy storage power supply fail to supply power normally, the backup power supply is selected to be turned on, thereby maintaining the voltage output of the DC power supply. When the main power supply is abnormal, the load 30 can still be supplied with power. In addition, when the power of the energy storage power supply module 120 is insufficient, the charging module 122 is turned on to charge the energy storage power supply module 120 .

The abnormality judgment module 153 is suitable for detecting the voltage of the main power module 110, the energy storage power module 120 and the backup power module 130. When the voltage of the main power module 110, the energy storage power module 120 and the backup power module 130 When the voltage does not meet the normal range, a control signal will be generated and sent to the light module 190, the status contact module 180 or the communication monitoring module 157. That is to say, when the main power module 110, the energy storage power module 120 or the backup power module 130 is abnormal, the control unit 140 can cause the light module 190 to light up the corresponding light signal and change the status contact module. 180 status display, or abnormal signals are sent to external devices through the communication monitoring module 157.

The logic operation module 152 is suitable for regular battery activation and health checks. Specifically, the logic operation module 152 controls the energy storage power supply module 120 to discharge the reactance module 123 through the discharge module 154, and controls the energy storage power supply module 120 to charge through the charging module 122. Through charging and discharging The cycle achieves the functions of battery activation and health check.

The method of battery activation and health check is as follows. The logic operation module 152 first charges the energy storage power supply module 120 to the battery upper limit value, and then causes the energy storage power supply module 120 to discharge the reactance module 123 . After the energy storage power supply module 120 starts to discharge, the time required for its voltage value to drop to a lower limit value of the battery is measured, which is the discharge time. A preset time is also stored in the logic operation module 152, and the time required for the energy storage power supply module 120 to discharge the reactance module 123 is calculated through the rated voltage and capacity of the energy storage power supply module 120, that is, the time required to discharge the reactance module 123. ideal value of time. The logic operation module 152 will compare the actual discharge time with the preset time to further generate battery evaluation data.

In other words, the health of the battery is judged by comparing the actual discharge time with the ideal discharge time. For example, if the actual discharge time is similar to the ideal discharge time, it means the battery is in good health. On the contrary, if the actual discharge time is significantly lower than the ideal discharge time, it means that the battery’s storage capacity has been exhausted. After decay, the battery is in poor health. At the same time, the activity of the battery can be maintained during the cycle of charging and discharging, preventing the battery from decaying if it is left standing for too long.

Among them, the frequency of activation and inspection, battery upper limit value, battery lower limit value, actual discharge time, ideal discharge time, and corresponding battery evaluation data are formulated based on battery specifications. In this embodiment, the battery activation and inspection of the energy storage power module 120 is performed once every 7 days. The lower limit of the battery is 20% of power, corresponding to a voltage of 12V; the upper limit of the battery is 80% of power, corresponding to The voltage is 16.5V. The ideal discharge time is 90 minutes. If the discharge time is greater than or equal to 90 minutes, battery evaluation data with high health will be generated, and the corresponding percentage is 80~100%; if the discharge time is between 60~90 minutes, battery evaluation data with moderate health will be generated. For battery evaluation data, the corresponding percentage is 70~79%; if the discharge time is less than 60 minutes, low health battery evaluation data is generated, and the corresponding percentage is 0~69%.

The power parallel connection anti-reverse module 155 in the control unit 140 is suitable for preventing the main power module 110 , the energy storage power module 120 and the backup power module 130 from being connected to each other through the control unit 140 . Since the main power module 110 , the energy storage power module 120 and the backup power module 130 are connected to the control unit 140 in parallel, if there are differences in the voltage values of the main power module 110 , the energy storage power module 120 and the backup power module 130 , then current backlash may occur. The power supply parallel anti-reverse module 155 is a circuit to prevent current backlash.

The overload protection module 156 is suitable for cutting off the connection between the load 30 and the control unit 140 when the power supply is too high to protect the control unit 140 or the load 30 from damage. The overload protection module 156 is, for example, a fuse. The communication monitoring module 157 is a conversion program based on the Modbus RTU format, which allows the data and signals of the control unit 140 to be output in the Modbus format, and output these data and signals to external devices through the connection port 142. Specifically, the communication monitoring module 157 can output signals including main power supply voltage, backup power supply voltage, output load voltage, battery health percentage, battery health status, battery status (voltage, (medium discharge), equipment module status, boost circuit status, equipment site address, transmission rate, firmware version, etc.

The DC power supply system 100 of this invention uses lithium batteries as a temporary power source when the main power supply fails. And set up a mechanism to discharge and charge the battery regularly to keep the lithium battery activated, and further use the time the battery discharges to a fixed impedance to judge the health of the battery. In this way, the lithium battery can be prevented from deteriorating due to long-term resting, and the health of the battery can be measured to further prompt whether the battery needs maintenance or replacement, so that the DC power supply system 100 can be kept in a better state to cope with emergencies such as power outages. condition.

The embodiments of this invention are described above, but they are not intended to limit the scope of the patent rights claimed by this invention. The scope of patent protection shall depend on the appended patent application scope and its equivalent fields. Any changes or modifications made by those with ordinary knowledge in the art without departing from the spirit or scope of this patent shall be equivalent changes or designs completed within the spirit disclosed in this invention, and shall be included in the following patent application scope. within.

10:First power supply

20:Second power supply

30:Load

100: DC power supply system

110: Main power module

120: Energy storage power module

130: Backup power module

140:Control unit

141: Repair isolating switch

142:Connection port

150: Stabilized output module

160: AC to DC converter

170, 170a~170c: Boost conversion module

180: Status contact module

190:Lamp module

Claims (8)

A DC power supply system electrically connected to an external first power supply, a second power supply and a load. The DC power supply system includes: a main power module electrically connected to the external first power supply; A backup power module, electrically connected to the external second power supply; a charging module, coupled to the main power module; an energy storage power module, coupled to the charging module; a reactance module, Coupled to the energy storage power supply module; a protection module is disposed between the charging module and the energy storage power supply module, suitable for detecting the voltage of the energy storage power supply module, and detecting the voltage of the energy storage power supply module according to the energy storage power supply module. The voltage switch of the module is disconnected or turned on; a control unit is coupled to the main power module, the backup power module, the energy storage power module, the reactance module and the charging module; a regulated output module A set, electrically connected to the control unit and the load, adapted to convert the voltage from the control unit into a voltage of a specific value and transmit it to the load; a light module coupled to the control unit; wherein, The control unit also includes a power detection module adapted to detect the voltages of the main power module, the backup power module and the energy storage power module, and select the one with the highest voltage to power the load; wherein , the control unit also includes an abnormality judgment module, suitable for detecting the voltage of the main power module, the backup power module and the energy storage power module. When the main power module, the backup power module and the energy storage power module If the voltage of the energy storage power module does not match a normal range, a control signal is sent to the light module; Wherein, the control unit also includes a logic operation module, suitable for controlling the energy storage power supply module, causing the energy storage power supply module to discharge the reactance module, and measuring the voltage of the energy storage power supply module to reduce to A discharge time of a battery lower limit value; wherein, the control unit is also adapted to compare the discharge time with a preset time and generate a battery evaluation data. The DC power supply system of claim 1 further includes a maintenance isolating switch. The main power module, the energy storage power module and the backup power module are coupled to the control unit through the maintenance isolating switch. The DC power supply system as described in claim 2 further includes a plurality of AC-DC converters, respectively coupled between the main power module and the maintenance isolating switch, and between the backup power module and the maintenance isolating switch. ; Wherein, the charging module is electrically connected to the main power module through the AC-DC converter. The DC power supply system of claim 3 further includes a plurality of boost converters, respectively coupled between the AC-DC converter and the maintenance isolating switch, and between the energy storage power module and the maintenance isolating switch. between the AC and DC converter and the maintenance isolating switch. The DC power supply system of claim 1, wherein when the voltage of the main power module does not meet the normal range, the control unit selects the energy storage power module to power the load. The DC power supply system of claim 5, wherein when the voltages of the main power module and the energy storage power module are lower than the normal range, the control unit selects the connection of the backup power module to the load. Power supply. The DC power supply system of claim 1, wherein when the voltage of the energy storage power supply module is lower than a battery measurement value, the control unit turns on the connection between the charging module and the energy storage power supply module. The DC power supply system of claim 1 further includes a status contact module connected to the control component.

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