Load sharing control device

Abstract

To provide a load sharing control device which is included in each of a plurality of power supply devices connected in parallel to a load, and which is capable of isolated operation, redundancy, and power derating while performing load sharing control.SOLUTION: A load sharing control device includes a first control unit that generates a first control signal to control the output current of a power supply device using the output current of the power supply device and the current of the load sharing bus, and a second control unit that generates a second control signal to control the output voltage of the power supply device using a target voltage of the power supply device, a feedback voltage fed back from the output voltage of the power supply device, and a control voltage on the basis of the first control signal of the first control unit, and the first control unit generates the first control signal to make the output current the same as the current of the load sharing bus and limits the output current to below a critical current.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a load sharing control device, and more particularly to a power derating control device. (derating) capable load sharing control device and load sharing control This is an invention related to circuits. [Background technology]

[0002] Generally, a power supply system consists of multiple power supply devices to ensure a stable supply of power. Connect them in parallel. If multiple power supplies are used, use a single power supply. In this case, heat generation, reliability, redundancy, modularization has advantages.

[0003] A power supply system that uses multiple power supply devices must balance the load between each power supply device. A load sharing controller is built in to allow multiple power sources to be used at the same time. When using a power supply device, it can be operated independently or in CC-CV (constant current-constant voltage) mode. Therefore, it is necessary to design a load sharing controller that can operate stably in various operating modes. be. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is power derating. To provide a load sharing control device and a load sharing control circuit capable of is.

[0005] The object of the present invention is not limited to the above-mentioned object, but may include other object not mentioned above. will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0006] In order to solve the above technical problems, a load sharing control device according to an embodiment of the present invention is provided. The device is a load sharing control device included in each of a plurality of power supply devices connected in parallel to the load. In the control device, the output current of the power supply device and the current of the load sharing bus are used to a first control unit that generates a first control signal that controls an output current of the power supply device; the target voltage of the power supply, the feedback voltage from the output voltage of the power supply and a control voltage according to a first control signal of the first control unit. a second control unit that generates a second control signal that controls the output voltage of the supply device; The control unit outputs a first control signal to make the output current equal to the current of the load sharing bus. to limit the output current to a critical current or less.

[0007] The first control unit also includes a first control unit for comparing the output current with the current of the load sharing bus. a comparison unit; a first calculation unit that calculates a difference between the output current and the current of the load sharing bus; The power supply may include a current control unit that generates the first control signal based on an output of the first calculation unit.

[0008] The current control unit controls the magnitude of the feedback voltage input to the second control unit. The first control signal can be generated to control the length.

[0009] The first control unit may include a second comparison unit that compares the output current with the critical current. This can be done.

[0010] The second control unit controls the feedback voltage and the first control signal. a second calculation unit that calculates a voltage difference; and a second calculation unit that calculates a difference between the target voltage and the output of the second calculation unit. a third calculation unit that outputs a voltage corresponding to the output of the power supply device; and and a voltage control unit that generates a second control signal.

[0011] Also, the target voltage or the critical current is reduced by the limited power of the power supply device. At least one can be adjusted.

[0012] In order to solve the above technical problem, a load sharing control circuit according to an embodiment of the present invention is provided. The circuit is connected in parallel to the load and includes multiple power supplies including CV circuits or CC-CV circuits. In the load sharing control circuit included in each of the The larger voltage of the sensed output current sensing voltage and the load share bus voltage is output. a maximum current output circuit section that outputs a voltage according to the output of the maximum current output circuit section and the critical current; a minimum current output circuit unit that outputs a smaller voltage among the output current sensing voltage and the minimum current sensing voltage; The difference between the outputs of the small current output circuit is amplified to and an amplifier section for applying to the feedback terminal.

[0013] The critical current may be a predetermined value or a predetermined value obtained by subtracting the reference current of the CC-CV circuit from the reference current. The value may be the value obtained by subtracting the value of .

[0014] The maximum current output circuit section receives the output sensing voltage from the (+) input terminal. a first comparator having a negative input terminal receiving the voltage of the load share bus; and The output terminal and the anode of the first comparator are connected to each other, and the voltage of the load sharing bus and the cathode are connected to each other. and a first diode to which the diode is connected.

[0015] The minimum current output circuit section inputs a voltage corresponding to the critical current to the (+) input terminal. a second comparator receiving the output of the maximum current output circuit unit at its (-) input terminal; The output terminal and cathode of the second comparator are connected to each other, and the voltage of the load sharing bus and and a second diode connected to the diode.

[0016] The amplifier section also calculates the output current sensing voltage and the output of the minimum current output circuit section. a transconductance amplifier for amplifying the difference; and an output of the transconductance amplifier. a first amplifier for amplifying the output; an output terminal of the first amplifier and a base are connected to each other; The amplifier's (-) input terminal and the emitter are connected, and the CV feedback terminal and the collector are connected. The transistor may include a transistor to which the gate is coupled.

[0017] The transconductance amplifier may have a predetermined offset voltage. Cut.

[0018] Also, the output current is sensed and amplified to output the output current sensing voltage. The amplifier may include a second amplifier.

[0019] Furthermore, the reference voltage of the CC-CV circuit and the CV circuit are controlled by the limited power of the power supply device. At least one of the reference voltage of the path or the critical current can be adjusted.

[0020] In addition, if the load includes a battery, it can be connected to the CC-CV circuit. do. [Effects of the Invention]

[0021] According to an embodiment of the present invention, load sharing control is performed while islanding and redundancy are performed. Redundancy is possible, and power derating is possible. erating) is possible.

[0022] In addition, even if a battery load is connected, load sharing is possible in all sections of the CC-CV. Even if the output is shorted, the CC control circuit operates to protect the device. do.

[0023] The effects of the present invention are not limited to the above examples, and more diverse effects can be achieved by the present invention. It is included in the subsection. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a block diagram of a load sharing control device according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 3] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 4] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 5] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 6] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 7] 1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 8]1 is a diagram illustrating a function of a load sharing control device according to an embodiment of the present invention. [Figure 9] 3 is a block diagram of a first control unit of the load sharing control device according to the embodiment of the present invention. FIG. [Figure 10] FIG. 3 is a block diagram of a second control unit of the load sharing control device according to the embodiment of the present invention. [Figure 11] FIG. 1 is a diagram illustrating an example of implementation of a load sharing control device according to an embodiment of the present invention. [Figure 12] 10A and 10B are diagrams illustrating the operation of a load sharing control device according to an embodiment of the present invention in different cases. [Figure 13] 10A and 10B are diagrams illustrating the operation of a load sharing control device according to an embodiment of the present invention in different cases. [Figure 14] FIG. 2 is a circuit diagram of a load sharing control circuit according to an embodiment of the present invention. [Figure 15] 10A and 10B are diagrams illustrating the operation of a load sharing control circuit according to an embodiment of the present invention in different cases. [Figure 16] 10A and 10B are diagrams illustrating the operation of a load sharing control circuit according to an embodiment of the present invention in different cases. [Figure 17] 10A and 10B are diagrams illustrating the operation of a load sharing control circuit according to an embodiment of the present invention in different cases. [Figure 18] FIG. 10 is a circuit diagram of a load sharing control circuit according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] However, the technical idea of ​​the present invention is not limited to the described embodiments, and may be different from each other. The present invention can be embodied in various forms, and the embodiments and the accompanying drawings are intended to be illustrative and not restrictive. One or more of the components of the formula (I) may be selectively combined or substituted.

[0027] Furthermore, terms (including technical and scientific terms) used in the embodiments of the present invention are expressly and specifically Unless otherwise defined and described, it is understood by a person skilled in the art to which the present invention pertains. A term that is commonly used and interpreted as having a commonly understood meaning, like a predefined term should be able to interpret its meaning taking into account the contextual meaning of the relevant art.

[0028] Furthermore, the terms used in the embodiments of the present invention are intended to explain the embodiments and are not to be construed as limiting the scope of the present invention. It is not intended to limit

[0029] In this specification, the singular can include the plural unless the context clearly dictates otherwise, and examples include "A and (and)" When "at least one (or more than one) of A, B, and C" is written, it means a combination of A, B, and C. It may include one or more of all possible combinations.

[0030] In addition, in describing the components of the embodiment of the present invention, first, second, A, B, (a), (b) and other terms may be used to distinguish the component from other components. The term is used to distinguish between the essence, order, or sequence of the relevant elements. is not limited to.

[0031] Note that a component may be described as 'linked', 'coupled', or 'connected' to another component. When listed, that component is directly 'connected', 'coupled', or 'bonded' to that other component. Not only when they are 'connected', but also when there are further connections between that component and that other component. This may also include cases where the items are 'coupled', 'coupled', or 'connected' by components. .

[0032] Also, it is described as being formed or arranged "above (above)" or "below (below)" each component. When mounted, "above" or "below" means that two components are directly connected to each other. Not only when two components come into contact with each other, but also when one or more additional components are formed or Also, when it is expressed as "above (above)" or "below (below)" , it can include not only the upward direction but also the downward direction based on one component.

[0033] FIG. 1 is a block diagram of a load sharing control device according to an embodiment of the present invention.

[0034] The rolling device according to one embodiment of the present invention includes a plurality of power supply devices connected in parallel to a load. a load sharing control circuit for controlling the output current of each of the plurality of power supply devices in the same manner; Here, the power supply device is a PSU (Power Supply Unit). , a device that supplies power to a load, such as supplying power for a server or DC-DC power for a vehicle. It can also be a device that supplies DC-DC power for a DC power distribution system. , and may, of course, include a variety of devices that provide power.

[0035] The rolling device included in each power supply device 300 is a first control unit 100 and a second control unit 200. The first control signal 104 generated by the first control unit 100 and the second control unit The second control signal 203 generated by 200 is used to perform load sharing. Power limiting is possible.

[0036] In order to efficiently and stably use a plurality of power supply devices 300, it is necessary to provide a plurality of power supply devices 300 each having a variety of functions. It is necessary.

[0037] When using multiple power supplies, the power supplies are connected in parallel as shown in Figure 2. At this time, redundancy must be implemented for efficient operation. Redundancy is the ability to provide power in the event of a fault or failure in any power supply. In this case, the system output can be maintained by operating on a separate power supply. Depending on the power load, the power supplies are driven sequentially to maximize light load efficiency, as shown in the graph in Figure 2. As shown in FIG. 2, the power supply unit 1 (PSU) operates at a load of up to 60%. Power Supply Unit 2 (PSU #1) is powered from 60 to 110%. Up to 160%: Power Supply Unit 3 (PSU #3); above 160%: Power Supply Unit 4 (PSU #4) to increase efficiency.

[0038] In addition, load sharing is required, as shown in Figure 3. What is load sharing? By controlling the current output by each power supply device to be the same, When operating power supply unit 1 (PSU #1) through power supply unit 3 (PSU #3), the system The load current I (system load) is I1 + I2 + I3, load sharing Load sharing is performed so that I1 = I2 = I3 through the power supply device. When 4 (PSU #4) is driven, I4 is 0 before driving, and I1 through load sharing If load sharing is performed so that =I2=I3=I4, the value of each current will be lower, but , the total system load current remains the same. The current value is increased to control the overall system load current to increase.

[0039] All power supplies include an output voltage controller, but each output voltage controller Depending on the deviation of circuit component characteristics (resistance value, etc.), the output target (target In this state, the outputs of the power supply devices are connected in parallel. When connected, the system output voltage is controlled by the highest target voltage. The power supply unit 1 (PSU#1) with the highest target voltage will control the output, and the remaining The power supply units 2, 3, and 4 (PSU #2, #3, and #4) are Since the output voltage is higher than the input voltage, the duty cycle is adjusted by each output voltage controller. ) will decrease. As a result, power supplies 2, 3, and 4 (PSU #2, #3, # 4) The power supply is reduced, and the power supply is concentrated in the power supply unit 1 (PSU#1), and the power This causes a current imbalance. To break the imbalance, load sharing is necessary.

[0040] For load sharing, a load sharing bus ( load share bus) line is added and connected, and internal load share control is performed. Add a load share controller. The highest output current information among the individual output currents of each power supply device is transmitted to the ABAS. Each load share controller is connected to each output so that the large current is transmitted through the load share bus. A comparator 41 is included to compare the current with the current of the load sharing bus, and the corresponding output current is the In the case of a large current, a diode 42 is provided to transmit the corresponding output current to the load sharing bus. The (+) input terminal of the comparator 41 receives a voltage sensed from each output current. is applied, and the (-) input terminal is applied with a voltage containing maximum current information, and the output current is If the current is greater than the maximum current, the comparator 42 outputs a high signal, and the diode is turned on, and the output current is transferred to the load share bus to allow the output current to flow through the separate power supply at full current. If the output current is less than the maximum current, the maximum current is maintained. .

[0041] When a current imbalance occurs and the output current is lower than the maximum current of the load-sharing bus, the output voltage flips The feedback signal is lowered to increase the duty cycle, which increases the output current. As a result, the output current increases and becomes equal to the maximum current. This state is called the steady state (st The output current is in the steady state with the same maximum current. When the target voltage and the output voltage are the same, the feedback voltage of the output voltage to the output voltage controller However, if the target voltage is lower than the output voltage in the steady state, In this case, the output voltage is 12V and the output is controlled by the power supply unit 1 (PSU#1) in FIG. In order to share the load even when By lowering the feedback voltage, it is possible to prevent the duty from becoming low. This prevents the power supply from being concentrated in one power supply device, allowing for load sharing.

[0042] Figure 6 shows a CC-CV (constant current-constant voltage) circuit, and the output voltage and It prevents the current from rising excessively. ), the output of comparator 61 goes high, which turns diode 62 on. Also, if the output current (Iout) is lower than the reference current (Iref), the comparison The output of the power supply diode 63 is open. VCC is applied to the control signal voltage (Vc) that controls the power supply. Here, the control signal voltage (Vc) is the It may include a switching operation signal that increases the duty cycle.

[0043] During this operation, if the output current (Iout) becomes larger than the reference current (Iref), , the output of comparator 64 goes low, turning on diode 63, which in turn causes control signal The voltage (Vc) is lower and therefore the duty of the power supply is also lower. The output current (Iout) will be set to the same as the reference current (Iref), The mode in this case is called CC (Constant Current) mode.

[0044] The output current of the power supply increases, and the output voltage (Vout ) is greater than the reference voltage (Vref), the output of comparator 61 goes low, Therefore, the diode 62 is turned on. This causes the voltage (Vc) to decrease, and therefore As a result, the output voltage (Vout) is lower than the reference voltage. The voltage (Vref) is set to the same as the CV (Con This is called constant voltage mode.

[0045] As shown in Figure 7, using output diodes and CC-CV circuits without load-sharing buses In this case, parallel operation is possible, but load sharing is not possible. The output voltage becomes large. For the same reason as in Figure 4, the target voltage becomes lower than the output voltage. As the tee decreases, the current of each power supply cannot be maintained and a current imbalance occurs.

[0046] In Figure 8, where a battery is connected to the load, the more the battery is charged, the faster the load will charge. When the target voltage is lower than the output voltage, the duty of the power supply decreases and each power The current in the supply is not maintained and a current imbalance occurs.

[0047] In this way, load sharing is possible even when there is a deviation in the target voltage of the power supply. In order to enable load sharing even in CV mode, The rolling device is composed of a first control unit 100 and a second control unit 200.

[0048] The first control unit 100 controls the output current 101 of the power supply device 300 and the load sharing bus 40 0 current to control the output current 101 of the power supply device 300. Generates 4.

[0049] More specifically, the first control unit 100 controls the power supply device 30 for load sharing. Each output of a plurality of power supplies receives an output current 101 of 0 from the load share bus 400. The first control signal 104 is generated so as to follow the maximum current 103 among the currents. The control signal 104 controls the second control unit 200 which controls the output voltage of the power supply device 300. The first control signal 104 can be a control signal that controls the output current 101 to a maximum current 103. At this time, the output current 101 of the power supply device 300 is different from the output current 101 of the power supply device 300. If the output current of the supply device is the maximum current, the corresponding output current 101 is 0 to another power supply 103 with a maximum current of 0.

[0050] The first control unit 100 sets the output current 101 to the same as the maximum current 103 of the load sharing bus 400. The first control signal 104 is generated so that the output current 101 is equal to or smaller than the critical current 102. If there is no limit value for the output current 101, the output current 101 will continue to increase and the overall This may affect the power supply system. For the purpose of the r derating, the output current 101 is limited to a critical current 102 or less. Here, the critical current 102 has a preset value or the power supply is operated in CC (constant current) mode. It can be set using the reference current to be used during control. When setting the critical current 102, a predetermined value is subtracted from the reference current to set the critical current 102. Here, the current value to be subtracted from the reference current is determined based on the specifications of the power supply device and safety. It can be changed depending on the requirement. Alternatively, the reference current can be set to the critical current 102. stomach.

[0051] The second control unit 200 controls the target voltage 201 of the power supply device 300, The feedback voltage 202 fed back from the output voltage of 0, and the first control unit 10 The output voltage of the power supply device 300 is controlled by using a control voltage corresponding to the first control signal 104 of 0. A second control signal 203 is generated to control the

[0052] More specifically, the second control unit 200 controls the power system of the power supply device 300. The target voltage 201, the feedback voltage 202, and the first control signal 104 are used. The second control signal 203 is generated to control the output voltage of the power supply device 300. The voltage obtained by subtracting the control voltage according to the first control signal 104 from the back voltage 202 is the target A second control signal 203 controls the output voltage of the power supply device 300 so that the output voltage becomes the output voltage 201. Generate.

[0053] A first control unit 100 controls the output current 101 to be equal to the maximum current 103. A control voltage according to the first control signal 104 from the control signal 104 and the feedback voltage 202 The output voltage of the power supply device 300 is adjusted so that the voltage obtained by subtracting The second control unit 200 controls the power supply devices 300 by using the second control signal 203. The first control unit 100 controls the output current 101 to the critical current 102. Power derating is performed by limiting the following:

[0054] FIG. 9 is a block diagram of a first control unit of a load sharing control device according to an embodiment of the present invention. is.

[0055] The first control unit 100 of the load sharing control device according to the embodiment of the present invention is shown in FIG. The first comparison unit 110, the first calculation unit 130, and the current control unit 140 can be configured as follows. The first control signal may be generated by comparing the currents. When comparing currents, we measure currents that are not currents. In other words, when comparing currents, each current can be A comparison can be made between the sensed voltages.

[0056] The first comparing unit 110 compares the output current 101 with the current of the load sharing bus 400. The comparator 110 compares the output current 101 with the maximum current 103 and calculates the difference between the output current 101 and the maximum current 103. It is determined which current is larger, the output current 101 or the maximum current 103. If it is greater than 3, the maximum current of the load share bus 400 is changed to the output current 101 .

[0057] The first calculation unit 130 calculates the difference between the output current 101 and the current of the load sharing bus 400. The first control unit 100 controls the output current 101 so that it becomes equal to the maximum current 103. , determine whether the output current 101 and the maximum current 103 are the same, and at the same time, determine whether the output current 1 A first calculation unit 13 uses the difference between the maximum current 103 and the maximum current 101 to generate a first control signal. 0 calculates the difference between the output current 101 and the maximum current 103.

[0058] The current control unit 140 generates a first control signal based on the output of the first calculation unit 130. That is, The difference between the output current 101 and the maximum current 103 output from the first calculation unit 130 is subtracted. The current control unit 140 generates a first control signal so as to generating a first control signal 104 that controls the magnitude of the feedback voltage 202 that is applied to the If the output current 101 is lower than the maximum current 103, the output current 101 is increased. This requires an increased duty cycle of the power supply 300. That is, the second control unit 200 that controls the duty of the power supply device 300 The feedback voltage of the output voltage used to control the The second control unit 200 adjusts the duty based on the actual feedback voltage. It is possible to prevent the temperature from being lowered.

[0059] The first control signal from the current control unit 140 increases the output current, but the power supply is too high. To limit the supply, the first control unit 100 sets a second ratio for limiting the output current to a critical current. The second comparing unit 120 may include a comparator 120. The comparator 120 may compare the output current 101 and the critical current 102. , and a lower current is applied to the first comparing unit 110. That is, the output current When the critical current 101 becomes larger than the critical current 102, the second comparing section 120 outputs the critical current 10 2 is output, and the critical current 102 is set to be larger than the maximum current 103, and the first comparison unit 1 The critical current 102 is output as the output of the first calculation unit 130. The output current 101 is controlled to be the same as the critical current 102 by the output current 101. The critical current is limited to the critical current 102. At this time, the critical current is controlled by load sharing. Alternatively, the current value for limiting the power supply can be set to can be set.

[0060] FIG. 10 is a block diagram of a second control unit of the load sharing control device according to the embodiment of the present invention. Figure.

[0061] The second control unit 200 of the load sharing control device according to the embodiment of the present invention is shown in FIG. As shown in the figure, the calculation unit 200 is configured of a second calculation unit 210, a third calculation unit 220, and a voltage control unit 230. can.

[0062] The second calculation unit 210 calculates the control voltage by the feedback voltage 202 and the first control signal 104. As explained above, the first control signal 104 is a feedback signal of the output voltage. The control voltage 202 is a control signal for lowering or raising the control voltage by the first control signal 104. In order to lower or raise the feedback voltage 202 by a certain voltage, the feedback voltage 202 and the control voltage by the first control signal 104 is calculated.

[0063] The third calculation unit 220 calculates the difference between the target voltage 201 and the output of the second calculation unit 210 . The voltage control unit 230, which controls the duty of the power supply device, adjusts the output voltage to the target voltage. For this purpose, the third calculation unit 220 controls the target voltage 20 The difference between the output of the first calculation unit 210 and the output of the second calculation unit 210 is calculated and output.

[0064] The voltage control unit 230 adjusts the output voltage to the target voltage based on the output of the third calculation unit 220. The second control signal 203 is generated to control the output voltage of the power supply device so as to 203 is a signal that controls the power supply of the power supply device 300. The voltage control unit 230 The power supply device 300 may include a pulse width modulation (PWM) unit. To control the duty cycle for the signal, pulse width modulation is used. A power supply duty control unit may be included to control the duty of the power supply. .

[0065] When it is necessary to limit the supply power for each power supply device 300, the target voltage 201 Alternatively, at least one of the critical currents 102 can be adjusted. and the output current, the output voltage is limited to the target voltage 201, The current is limited to the critical current 102, but the target voltage 201 or the critical current 102 is By adjusting at least one of these, the power supply can be limited. Power derating, which limits the power supply, is possible. is.

[0066] The load sharing control device according to the embodiment of the present invention is embodied as shown in FIG. can be done.

[0067] Comparison of output current, maximum current, and critical current is performed using the sensing voltage and set voltage of each current. The output current sensing voltage 1101 can be implemented by the load sharing bus 14 The maximum current sensing voltage of 00 is compared with the comparator 1111 and the diode 1112. The largest output current of the power supply devices can be transmitted. The difference between the output current sensing voltage 1101 and the maximum current sensing voltage 1400 is calculated 113 0, and the current control unit 1140 increases the sensing voltage 1101 of the output current to the maximum according to the difference. The first control signal is generated so that the current is equal to the sensing voltage 1400. The flow control unit 1140 can perform control by PI control. This increases the output voltage sensing voltage 1101, but To limit the magnitude of the switching voltage 1101, the critical current voltage 1102 and the diode 11 20. The output current sensing voltage 1101 is compared with the critical current voltage If it is greater than 1102, the diode is turned on and the (+) terminal input of the comparator 1111 becomes critical. The current voltage 1102 is input, and the critical current voltage 1102 is the maximum current sensing voltage 1 400, the output current sensing voltage 1101 is The output current is limited to the critical current by controlling the voltage to be equal to the critical current voltage 1102. In this way, the output current is limited to the critical current and the device operates in constant current mode. The load sharing configuration is a load sharing controller (CC controller). Roller) 1150.

[0068] The control voltage by the control signal of the current control unit 1140 is a feedback of the output voltage 1202. It is used to control the voltage, i.e., the feedback voltage of the output voltage 1202 and the current control. The difference in the control voltage according to the control signal of the control unit 1140 is calculated 1210, and the target is determined based on the result. The difference between the output voltage 1201 and the target voltage 1202 is calculated 1220. The difference between the feedback voltage of O2 and the control voltage by the control signal of the current control section 1140 is The second control signal is generated so that the voltage is equal to the target voltage 1201. The control signal of the voltage control unit 1230 is , which is applied to the pulse width modulation unit (PWM) 1240 and is used to control the power stage 13 of the power supply. The voltage control unit 1230 and the duty of the signal applied to the voltage control unit 1230 can be controlled. The pulse width modulator 1240 operates in constant voltage mode, limiting the voltage to the target voltage. In this way, it can be called a CV controller 1250.

[0069] The load sharing control device implemented as shown in Figure 11 stabilizes the output current at the maximum current. In CC mode, if the load battery voltage is higher than the target voltage, In CV mode, the output voltage is regulated to the target voltage, and the battery voltage is different. When controlled by a force supply device, it can operate as shown in Figure 12. For example, If the battery voltage is 12V and the target voltage is 11V, the output current will be the maximum current. Although the state is stabilized, the output of the calculation unit 1130 is 0, and the output of the current control unit 1140 is The control voltage by the input control signal is turned on the 12V, which is the feedback voltage of the output voltage. The voltage control unit 1230 receives the input and outputs a voltage of 1 V to reduce the voltage to the target voltage of 11 V. The difference between the target voltage and the feedback voltage of the output voltage is set to 0V. The duty cycle of the power supply can be controlled, i.e., outputting 5V, PWM Output Vg=24V, Vm=10V, and duty D=0.5. Load sharing can be performed.

[0070] In CC mode, if the battery voltage is lower than the target voltage, the operation will be as shown in Figure 13. For example, if the battery voltage is 10V and the target voltage is 11V, In this case, the output current is stabilized at the maximum current, but the output of the calculation unit 1130 is 0. Therefore, the control voltage according to the control signal output from the current control unit 1140 is -1 to increase the feedback voltage of 10V to the target voltage of 11V V. The voltage control unit 1230 receives the target voltage and the output voltage. The duty of the power supply device can be controlled so that the difference in the back voltage is 0V. That is, it outputs 4.1V, PWM is Vg=24V, Vm=10V, and the duty cycle is By outputting Tee D=0.5, load sharing of the power supply device can be performed.

[0071] A load sharing control circuit according to an embodiment of the present invention is connected in parallel to a load, A load sharing circuit or a load sharing circuit included in each of a plurality of power supply devices including a CC-CV circuit an output current sensing circuit for sensing the output current of the power supply device; a maximum current output circuit unit that outputs the larger voltage of the load sharing bus voltage and the load sharing bus voltage; The minimum current output that outputs the smaller voltage between the output of the large current output circuit and the voltage due to the critical current. a circuit unit, and amplifying the difference between the output current sensing voltage and the output of the minimum current output circuit unit; and an amplifier section that applies the voltage to the CV feedback terminal of the CV circuit or the CC-CV circuit. may include:

[0072] FIG. 14 is a circuit diagram of a load sharing control circuit 2150 according to one embodiment of the present invention. do.

[0073] The load sharing control circuit 2150 according to one embodiment of the present invention is the same as that described in FIGS. This is a circuit corresponding to the load sharing control device explained above, and duplicated explanations will be omitted below. As explained in Figure 13, the output voltage feedback is used to achieve load sharing. It is necessary to apply a (-) value as a control voltage to be subtracted from the voltage, and this can be done with an analog circuit. To achieve this, as shown in FIG. 14, a load sharing control circuit according to an embodiment of the present invention is This can be achieved.

[0074] The maximum current output circuit receives the output current sensing voltage 1201 at the (+) input terminal. The first comparator 21 receives the voltage of the load share bus 2400 at its (-) input terminal. 11 and the output terminal and anode of the first comparator 2111 are connected to the load sharing bus 240 The output current may include a first diode 2112 having a cathode connected to a voltage of 0. a second amplifier 210 that senses and amplifies the current and outputs an output current sensing voltage 2101; The output current 2102 is sensed and amplified by a second amplifier 2103. By using this amplifier, it is possible to sense the output current with high precision. The first comparator 211 may be a high-precision OP-AMP. The first comparator 2111 and the first diode 211 can be implemented as an OP-AMP comparator or the like. 12 determines the voltage of the output current 2101 or the voltage of the load share bus 2400, whichever is greater. The lowest voltage is output as the voltage at the maximum current.

[0075] The minimum current output circuit receives the voltage due to the critical current 2103 at the (+) input terminal. a second comparator 2122 which receives the output of the maximum current output circuit unit at its (-) input terminal; The output terminal and cathode of the second comparator 2122 are connected to the load sharing bus 2400. The second diode 2121 may include a second diode 2121 having an anode connected to the voltage of the first diode. The field current 2103 is a preset value or a reference current (Ire f) minus a predetermined value (ΔI). Since the cathode-anode direction of 2121 is opposite to that of the first diode 2112, The smaller voltage between the voltage due to the critical current 2103 and the maximum current output circuit output is output. That is, the voltage of the transconductance amplifier 2131 that constitutes the amplifier is The (+) input can be limited to the voltage of the critical current.

[0076] The amplifier section amplifies the difference between the output current 1201 sensing voltage and the output of the minimum current output circuit section. Widening transconductance amplifier 2131, transconductance amplifier 2131 a first amplifier 2133 for amplifying the output of the first amplifier 2133; and an output terminal of the first amplifier 2133 and a base connected to the first amplifier 2133. The (-) input terminal of the first amplifier is connected to the emitter, and the CV feed The back terminal 2210 may include a transistor 2134 having a collector connected thereto. A transconductance amplifier is a device that converts a voltage input The amplifier applies a gain to the difference between the output current and the sensing voltage. The transconductance amplifier 21 amplifies the difference between the outputs of the minimum current output circuit section. 31 can have a predetermined offset voltage 2132. This allows the output current The difference between the sensing voltage 1201 and the maximum current sensing voltage is equal to or greater than the offset voltage. In this case, the current control function can be activated. This prevents the amplifier from malfunctioning. This can prevent errors in current control, etc., due to the offset voltage being set in advance. The transconductance amplifier may be configured to have a voltage of 25 mV. The output of 2131 is amplified by a first amplifier 2133 and is fed to the emitter of a transistor 2134. When a voltage is applied to the resistor connected to the collector of transistor 2134, Decrease or increase the voltage at the CV feedback terminal 2210 connected to the In other words, the voltage at the CV feedback terminal 2210 is set to (+) or (-). This allows the output voltage 2202 to be controlled to the reference voltage Load sharing is possible by operating the power supply in CV mode, which is larger than 2201. It can be made possible.

[0077] As described above, the load sharing control circuit implemented in the power supply device is the reference voltage of the CC-CV circuit, the reference voltage of the CV circuit, or the critical current At least one of the power supply devices 300 can be adjusted. If there is a target voltage, the reference voltage of the CC-CV circuit or the reference voltage of the CV circuit At least one of the output voltage and the output current can be adjusted. The output voltage is limited to the reference voltage and the output current is limited to the critical current. The power supply is controlled by adjusting at least one of the reference voltage and the critical current. This allows the power supply to be limited by power derating ( power derating) is possible.

[0078] As shown in FIG. 14, the load sharing control circuit according to the embodiment of the present invention may be various. It can operate in various modes of operation.

[0079] In the case of standalone operation without parallel operation with other power supply devices, 15, the load sharing control circuit 2150 is equivalent to an open Then, only the CC-CV circuit will operate.

[0080] When operating in parallel with other power supply devices, if the output voltage is lower than the target voltage, As shown in the figure, the CV circuit and the load sharing control circuit 21 operate in CC mode. 50 is equivalently opened. The CC circuit reduces the output current 2202 to the reference It is controlled to operate limited by the current 2102.

[0081] When driving in parallel with other power supply devices, if the output voltage is higher than the target voltage, So, it operates in CV mode and at the same time, it is also used for load sharing. The control circuit 2150 operates. At this time, the CC circuit is equivalently opened. At this time, load sharing is performed, but the output current is the critical current, which is not the reference current 2102. It is controlled to operate within the limits of 2103.

[0082] When a battery is connected to the load, as shown in Figure 14, the load sharing control circuit 2 150 is connected to the CC-CV circuit and operates without a battery connected to the load. 18, the load sharing control circuit 2150 is a CV circuit that is not a CC-CV circuit. -It can only be connected to the circuit and operate. That is, it can supply power to the server or the car. Various types of DC-DC converters that provide dual-purpose DC-DC power or DC-DC power for DC distribution systems Included in the power supply device that applies to the application and load, and load sharing In addition, it can include various devices that supply power. Of course.

[0083] As described above, a load sharing control device or control system capable of power derating Stand-alone operation is possible through the circuit, and redundancy is possible. undancy) function to adjust the target voltage and critical current to achieve power delay. Power derating is possible. Also, if the battery is connected to the load, Even if the CC-CV is connected, load sharing is possible in all sections. The CC control circuit operates to protect the device.

[0084] Each component of the load sharing control device according to the embodiment of the present invention is implemented in software. It is natural that these will be implemented in hardware such as circuits.

[0085] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, A person skilled in the art would understand that the present invention does not change its technical idea or essential features. It should be understood that other specific embodiments may be used. It should be understood that the examples are illustrative in all respects and not restrictive. .

Claims

1. A load sharing control device included in each of a plurality of power supply devices connected in parallel to a load In the location, The power supply device outputs a current to the power supply unit and a current from the load sharing bus. a first control unit that generates a first control signal that controls the output current of the The target voltage of the power supply, feedback from the output voltage of the power supply and a control voltage according to the first control signal of the first control unit. a second control unit that generates a second control signal to control the output voltage of the power supply device; 、 The first control unit generating a first control signal to make the output current equal to the current of the load sharing bus; and limiting the output current to a critical current or less.

2. The first control unit a first comparison unit that compares the output current with a current of the load sharing bus; a first calculation unit that calculates a difference between the output current and a current of the load sharing bus; a current control unit that generates the first control signal according to an output of the first calculation unit; Item 1. A load sharing control device according to item 1.

3. The current control unit The first control unit controls the magnitude of the feedback voltage input to the second control unit. The load sharing control device according to claim 2 , wherein the load sharing control device generates a signal.

4. The first control unit 2. The load cell of claim 1, further comprising a second comparison unit that compares the output current with the critical current. Wearing control device.

5. The second control unit is a second calculation for calculating a difference between the feedback voltage and a control voltage based on the first control signal; Department and; a third calculation unit that calculates a difference between the target voltage and the output of the second calculation unit; A second control signal is generated based on the output of the third calculation unit to control the output voltage of the power supply device.

2. The load sharing control device according to claim 1, further comprising: a voltage control unit configured to control a voltage between the power supply and the load sharing control unit;

6. The power limit of the power supply device reduces at least the target voltage or the critical current. The load sharing control device according to claim 1 , further comprising: a load sharing control unit for controlling one of the load sharing control units;

7. Each of a plurality of power supply devices including a CV circuit or a CC-CV circuit is connected in parallel to a load. In the load sharing control circuit included in each An output current sensing voltage and a load share obtained by sensing the output current of the power supply device a maximum current output circuit unit that outputs a larger voltage among the bus voltages; A minimum voltage output from the maximum current output circuit unit is smaller than the voltage due to the critical current. a current output circuit section; The difference between the output current sensing voltage and the output of the minimum current output circuit unit is amplified to an amplifier section that applies an input to a V circuit or a CV feedback terminal of the CC-CV circuit; ,Load sharing control circuit.

8. The critical current is It is a preset value or a value obtained by subtracting a predetermined value from the reference current of the CC-CV circuit.

8. The load sharing control circuit according to claim 7, wherein:

9. The maximum current output circuit unit The output current sensing voltage is input to the (+) input terminal, and the load sharing bus a first comparator receiving the voltage at its (-) input terminal; The output terminal and the anode of the first comparator are connected to each other, and the voltage of the load sharing bus is connected to the cathode. and a first diode to which the diode is connected. circuit.

10. The minimum current output circuit unit The voltage due to the critical current is input to the (+) input terminal of the maximum current output circuit section. a second comparator having an output connected to a (-) input terminal; The output terminal and cathode of the second comparator are connected to each other, and the voltage of the load sharing bus and the and a second diode to which the diode is coupled. circuit.

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