TW399358B - Single wire current share paralleling of current control mode DC power supplies - Google Patents

Abstract

This is a brand new method for controlling the paralleled modules current-sharing of a single wire current share paralleling of current control mode DC power supplies. The controlling method for every paralleled DC power supply is in current-controlling mode; therefore, a share bus will be used in-between the modules for current-sharing in order to share the exported current. By utilizing a method of single wire paralleled multiple modules with current-controlling, it is the simplest configuration. It will also enhance the response in circuit of power supply. Thus, it will decrease the possibility of uneven instant current condition and eliminate the unnecessary warning for limited-current. Moreover, the current feedback and current-sharing are sharing the same current detector. Therefore, this controlling method has a low production cost but also allows the power supply to become modularized completely. Thus, there lots of advantages such as improving the reliability and audio-susceptibility etc.

Description

B7 V. Description of the invention (1 2) [Creation background] In the case of large DC load, DC Wei supplier is usually used to connect multiple modules in parallel, and the average share of _load current '_ can reduce the module current load, and has the ability to expand and The advantages of easy replacement of maintenance materials improve efficiency and reliability. There are many methods for the average distribution of load currents in parallel groups. Among them, the single parallel method is the simplest. As shown in the first figure, each module uses a share bus as the current sharing. in accordance with. Because this method only needs to add a few operational amplifiers or comparator circuits to each module, this method has many dreams: (1) There is no need to add a central control unit (central control to Handle the current distribution problem. Because adding the central control unit will increase the cost and take up space, the failure of the central control unit will also cause crashes and reduce the reliability. In order to increase reliability, there is also a single-wire parallel system with a central control unit as an auxiliary system. Appears. (2) There is no master-slave module. The connection between the modules is a reference for current distribution, but each module is independent (aut〇n〇m〇us), and Not using a certain module as the standard, there is no problem that the main module fails and crashes. It is printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economics. Therefore, this method is currently used in large DC power supply systems. For example, if the response of the module current sharing is too slow, transient transient current unevenness will occur during transient. This phenomenon usually occurs When the load changes or some modules fail to redistribute the current. Due to the module's reaction speed is too slow, some of the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297), the description of the invention (2 Economy. Which Central Standards Bureau staff consumer cooperative printed module current is too high, and enters the current limit protection state and issues an alarm. Although this alarm is not very serious, and the duration is short, but this is It can be avoided. [Creation summary] Yanjiu found that the parallel mode of the voltage control mode uses the current of the current line to compare with the current of the module to adjust the voltage command of the control circuit. This control method responds to the voltage loop bandwidth ( bandwidth), which slows down the overall circuit response, which is the reason for overcurrent. This creation proposes a single-wire current control mode with multiple modules in parallel. The current mode power supply has a faster circuit response. Comparing the external current sharing line with its own module to adjust the current command, the current sharing can also be achieved. Purpose. When the current of each module is consistent with the current command indicated by the current sharing line, the purpose of the current sharing we have achieved is achieved. The current control mode used in this creation has the following advantages: 提高 The bandwidth of the current control loop is increased and increased. Fast overall circuit response. (2) The audio frequency tolerance is also better. (3) Because the current control mode must use a current detector to control the output inductor current, and the multi-module parallel average current control must also be in the mode. A current-side device is installed in the group. In this case, each module can use the same ^, and the current detector is used for feedback control and current distribution at the same time, without increasing costs. Single-line DC power supply multiple modules The parallel average load method combines the two major structures described above. The detailed circuit diagram is for illustration only and is not the only circuit form of this creation. In the second one, the method of laying each DC power supply is current control mode. ___ 2 This paper size is applicable to CNS) (Please read the precautions on the back before writing this page)-Clothes, βτ

Description of the Invention (Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 'Each module uses an average, starting γ L, based on the material flow basis, which has these advantages. Refer to' Thousands of distribution output current, ^ [ Schematic description] The picture shows the Koche Er'e __ face should be turned 丨 Qian Qianmo Ciqi ride flow [detailed description of the figure] = Figure: domain input terminal, the input is 総 or AC. ν〇 means that the output terminals of each module are connected in parallel and are DC power supply modules. buS is a current sharing line that short-circuits each module_current control. = 2, · Each module has three ships to calculate the amplification 郷The function of each part is described as follows: ⑴ The share bus is used to correct the current error. In addition to the input and output in parallel between the modules, the current sharing line needs to be shorted to indicate the average current. Module current signal and current sharing, there is a current sharing resistor Rs between the lines. When the current sharing domain network of each module, each mode peak A current is the same. This current sharing resistor has accuracy requirements If you want the current of each module to be proportionally distributed, you only need to adjust the current sharing resistance to be proportional. (2) The voltage error amplifier (err〇r amplifies the output voltage of the module and uses it as a current command, but this current command still needs to cooperate with the current sharing error amplifier to obtain the error current correction current command, and these two signals are in an appropriate proportion. Provisioned as a current command.

V. Description of the invention (4) A7 B7. Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (3) Current sharing error amplification sUs Adds the difference between the voltage represented by the average current line and the voltage represented by the current itself Amplification and voltage error signals are combined into a current command. If there is a current correction command from the central control unit, it is also mixed with the voltage error signal and current sharing error current correction current command to become the current command. (4) The current error amplifier Uc amplifies the difference between the current command and the module current, and sends it to the pulse width modulator (pulse widthm0dulat〇1〇pwM for modulation, usually compensation (c〇mpensati〇n) The circuit is added in this stage. (5) The pulse width modulator converts the error voltage into the pulse wave of the driving rate element. (6) The power stage circuit includes a driver circuit and a power oxide gate transistor (power MOSFET) , Input and output chirped circuits. Power stage circuits can use different circuit architectures, but need to operate the inductor current in continuous mode or use a filter to take out the average current signal of the inductor or switch. (7) The current sensor H is placed in the inductor or other places where the power current can be measured.的 The resistance of each module's output lead to the load is different. We use different series resistance Rw to represent it. Usually it is also the cause of uneven current flow. 〇 (9) S1 is the exit of the parallel switch. When the module fails When the current sharing line and the module are disconnected and exited in parallel. "(10) The external current command Cout can receive the signal from the central control unit for further correction. 4 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) (please read the precautions on the back side first) (Fill in this page). Binding A7 A7

The principle of its circuit operation can be described in terms of single machine and multiple machines: ⑴ When the single machine is difficult, the voltage signal converted by Huanqian Juer is only connected in series with the current sharing line-current sharing resistance, due to the input impedance of the computing device (input impedence) is very high, so this current sharing electric coffee: current flowing through, the voltage of the current sharing line is equal to the voltage converted by the module current, so the output of the current sharing amplifier Us is zero. This condition module is a standard xiangxiang butterfly with the secret of current return. The-current command is generated when there is an error in the turning voltage to increase the module current and increase the output voltage: until there is no error voltage. (2) When multiple machines are running, the voltage signal of each Guanrui will be in the phase domain of Junlin via the current resistance RS. When the current sharing resistance of the money group is equal, the voltage of the current sharing line is just the equivalent voltage of the average current that each module wants. Therefore, the voltage represented by the current sharing line voltage and its current is amplified into a current correction command. If it is too small, it is necessary to increase the current value of 7, and after the PWM pulse width modulation, the power stage circuit increases the module current until there is no error current, and vice versa. When the current of each module is consistent with the current indicated by the current sharing line, the purpose is achieved. Therefore, 'when multiple modules are connected in parallel, three circuits are formed, the highest layer is the voltage circuit, the second is the current flow circuit, and the most Θ layer is the current flow circuit. Because the pulse width of the module is only one, it needs to control multiple loops. Therefore, like other multi-loop control, each loop must be designed with a different bandwidth to achieve the purpose of voltage stabilization and current sharing. 5

Claims (1)

The Central Industry Standards Bureau of the Ministry of Economic Affairs's Male Workers 'Consumer Cooperatives printed $ L, a multi-module DC Wei supply H parallel method, applied to DC power supply modules connected in parallel; including at least _ more power supply modules' and at least- The wires of the output currents of the cans are called current sharing lines. 2. The parallel method of multi-mode and board DC power supply as described in item 1 of the scope of patent application, where the DC power supply module can be an actual DC power supply or a combination of DC power supply circuits of more than one group If the above-mentioned DC power supply circuit and current sharing line are put into the same power supply, the scope of this patent is still applicable. • The method of knowing the multi-module DC power supply described in item 1 of Shen Jing's patent scope f1, in which the current sharing line can be omitted if it is powered by a single module. 4. The method for parallel connection of multi-module DC power supplies described in the SF patent application. The input of the DC power supply can be AC power or DC power. The output is more than one set of DC power. 5. The multi-module DC power supply parallel connection method described in item 丨 of the scope of patent application, wherein if each group of DC power supply outputs DC power in parallel for current distribution, there is exactly one current sharing line to control its current distribution. 6 · = Multi-module DC power supply parallel method described in item 1 of Shenyan's patent scope, in which the module wire connection method: the wheel-in power line can be connected in series or in parallel, and the output power line is connected in parallel. Multiple sets of outputs are connected in parallel for each set of output lines, and the current sharing line reserves the output control points for the control circuit for each set of control current distribution. Short circuit is used as a reference for adjusting the output current. 7_ Multi-module DC power supply as described in item 1 of the scope of patent application and (please read the precautions on the back of the ridge before filling in the poverty ") • m I ----In I i 1 I «n I. ~ ^ .TT --- vn In ...... ni HJt---—I— · 6 Paper and paper iiJLi is applicable to the country ’s gradient (CNS) (plus ^ 297 public envy) The Central Industry Standards Bureau of the Ministry of Economic Affairs's Male Workers 'Consumer Cooperatives printed $ L, a multi-module DC Wei supply H parallel method, applied to DC power supply modules connected in parallel; including at least _ more power supply modules' and at least- The wires of the output currents of the cans are called current sharing lines. 2. The parallel method of multi-mode and board DC power supply as described in item 1 of the scope of patent application, where the DC power supply module can be an actual DC power supply or a combination of DC power supply circuits of more than one group If the above-mentioned DC power supply circuit and current sharing line are put into the same power supply, the scope of this patent is still applicable. • The method of knowing the multi-module DC power supply described in item 1 of Shen Jing's patent scope f1, in which the current sharing line can be omitted if it is powered by a single module. 4. The method for parallel connection of multi-module DC power supplies described in the SF patent application. The input of the DC power supply can be AC power or DC power. The output is more than one set of DC power. 5. The multi-module DC power supply parallel connection method described in item 丨 of the scope of patent application, wherein if each group of DC power supply outputs DC power in parallel for current distribution, there is exactly one current sharing line to control its current distribution. 6 · = Multi-module DC power supply parallel method described in item 1 of Shenyan's patent scope, in which the module wire connection method: the wheel-in power line can be connected in series or in parallel, and the output power line is connected in parallel. Multiple sets of outputs are connected in parallel for each set of output lines, and the current sharing line reserves the output control points for the control circuit for each set of control current distribution. Short circuit is used as a reference for adjusting the output current. 7_ Multi-module DC power supply as described in item 1 of the scope of patent application and (please read the precautions on the back of the ridge before filling in the poverty ") • m I ----In I i 1 I «n I. ~ ^ .TT --- vn In ...... ni HJt---—I— · 6 Paper and paper iiJLi is applicable to the National Gradient (CNS) (plus 297 public envy) Associate Bureau Ά Industrial Consumers Cooperative 1SL A8 B8 C8 D8 Patent Application Scope-Linking Method 'The control circuit of each group of each module output should contain at least the following connected circuits or components: (1) Current detection components: Any Components or circuits that detect current, such as Hall detectors and resistors; P) Current-sharing resistor: A resistor is connected between the current detection element and the reserved wheel-out control point. This control point is connected to the current sharing (3) Current sharing error amplifying circuit: an operational amplifier and compensation network amplifies the current sharing, the error signal on the resistor is amplified, and injects a current error amplifying circuit; ⑷ Voltage error amplifying circuit: an operational amplifier and a compensation network will output Amplify the error signal of voltage and inject current error amplifier circuit; (5) Current error amplifier Large circuit: an operational amplifier and a compensation network amplify the error signal of the current sharing error amplifier circuit and the voltage error amplifier circuit. The power supply module is controlled by the modulation, driving, and power circuits to change the output current. 8. The multi-module DC power supply parallel method described in item 丨 of the scope of patent application, wherein the control circuit is connected in accordance with method 7 of the scope of patent application, and an average current signal will be generated on the current sharing line. This signal is related to each mode. The comparison of the current detector signal of the group produces an error; on this error current sharing resistor, the current sharing error amplifying circuit mixes the error signal with a large U, and then mixes it with the voltage error amplifying signal, and then compares it with the current error amplifying circuit. The modulation, driving and power circuits change the current of each module, so that the current of each module reaches the current sharing or a fixed ratio, and the error signal across the current sharing resistance will be reduced or eliminated. 9_As mentioned in the first paragraph of the multi-module DC power supply parallel method described above, where the operational amplifier can be a linear or non-linear operational amplifier (2 丨 0X297mm fn In I— i ---- -. 1 i—--1- ....... H..1 .....!-I ---- m 丁 ϋ In ---- I. _ I ^ i --- ^ Π— (Please read the precautions on the back before filling this page) ABCD printed by the Central Government Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives, and applied for the scope of patent; The compensation network can be a circuit composed of resistors, resistors, capacitors, or other non-linear components .. Electricity '1, Electricity 1 0. Multi-module DC power supply as described in item i of the patent application scope. . The connection method, in which the control circuit between the current sharing resistor and the current sharing line predicts the control point in series-switch, in case the DC power supply module ^ fails to withdraw from the parallel power supply. The multi-touch DC power supply parallel method described in item 1, wherein the switch may be a mechanical relay switch or an electronic switch. The multi-module DC power supply parallel method described in item 'where the current-to-voltage signal conversion ratio of the current detection element inside each module is adjusted so that the conversion ratio of each module is a certain ratio, so that each module The current output is distributed in a certain proportion.