TWI234329B - Master-slave current distribution circuit - Google Patents

Abstract

The present invention is a master-slave current distribution circuit applied in a power-supply system connected in parallel. The power-supply system connected in parallel is formed of a first power supply and a second power supply connected in parallel. The master-slave current distribution circuit comprises: a voltage amplifier; a power converter stage unit whose input end is connected to the output end of the voltage amplifier, and whose output end is connected to a load; a current detection unit; an equivalent diode; a tunable amplifier; an adder; and an active droop unit connected to the output end of the current detection unit. When the load is less than a preset value, the active droop unit adjusts the reference operating voltage of the master-slave current distribution circuit linearly, so as to reduce the error generated when the first power supply and the second power supply are connected in parallel to a light load.

Description

1234329

V. Description of the invention (1) Prior art The technical field to which the invention belongs This case refers to a master-slave current distribution circuit, especially a master-slave current distribution circuit applied to a power supply parallel system. Please refer to the first figure (a), which is a master-slave current distribution circuit used in a conventional power supply parallel system in a conventional technology. The master-slave current distribution circuit 1 is composed of a voltage amplifier 11, an impedance 12, Power conversion stage unit; IL 13, current detection unit 14, equivalent diode 15, adjustable amplifier i6, and addition unit 17 together. The master-slave current distribution circuit i is electrically connected to two parallel power supplies PS1 and PS2 to achieve the purpose of stably distributing the output voltage and output current of the power supplies PS1 and PS2. In 1, it is necessary to add a bandgap voltage to prevent parallel errors between the power supplies PS1 and PS2, and cause instability in the output, such as the equivalent diode. 5 is the discrete component (Discrete Component) Its linear operating region (approximately a method of generating a non-linear condition within 〇 ~ 〇4. However, this energy gap voltage will make the output of the power supply PS1 and PS2 unstable at large t instead. To overcome this problem, Xi A solution appears in the knowing technology

1234329

The method is to set the master-slave current distribution circuit 1 by using the voltage drop method (Droop MethOd). Take an operating slope from zero load to the maximum load. The voltage range that can be used, and Vomax is the maximum value of the output voltage. However, this method!? Disadvantages 疋 'When the AV is smaller or ^ 0111 to be larger, the error of parallel power will become larger and make two It cannot be connected in parallel at light load (as shown in Figure: (b)). At the same time, the voltage between the power supplies must not be suspended. Moreover, because of temperature drift or errors in components and parts, the power supply may also be caused. The phenomenon that the suppliers cannot be connected in parallel.

Given the bottlenecks appearing in the above-mentioned conventional techniques, the applicant tried carefully 彳 = ^ 9, and with a persevering spirit, finally invented the "master-slave electric & distribution circuit" in this case. The following is a brief description of this case. Summary of the Invention

雁 用 # 二 = The main idea is to propose a master-slave current distribution circuit. In a parallel system of small source power supplies, the power supply is Yan Erluo. A first power supply and a second power supply. Supply rate conversion: single-battery current distribution circuit includes:-voltage amplifier;-total 苴, two 70, one input terminal is connected to one of the voltage amplifier output = output terminal is connected to a load;-current debt measurement unit , Its effective diode, the output terminal of the rate conversion stage unit and the load; 〆_ ,, an input terminal is connected to one of the outputs of the current detection unit

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1 chat system, one output amplifier, its _ terminal and the equivalent two equivalent diode method unit, one of the connected amplifier Droop) unit, by the active adjustment of the master-slave value to Reduce this light load when generated according to the above road. The terminal is connected to the inverting input terminal, the output of the input and the output terminal are connected to the voltage output terminal; an error is caused by the first power source being connected to the voltage reduction unit current distribution. Conception, in which a power supply is connected to the electric input terminal, and one of the power supply is not an active current detection unit in the load circuit and the current detection unit of the load circuit. The output non-inverting input terminal is connected to the parallel system of the reactor; the one plus reverse wheel input terminal is adjusted with the adjustable voltage (Active the output terminal; where, if it is less than a preset value, the operating voltage of one of the lines refers to one The power supply is connected in parallel to the voltage amplifier and has a negative feedback. According to the above concept, it is 1% ~ 5% of the voltage. The negative feedback circuit is constructed by an impedance and the operating voltage is referenced. The value is the output power according to the above concept, wherein there is an energy gap between the non-reverse wheel input end of the output adjustable amplifier of the current detection unit 懕 = change unit for modulating the current detection unit There is an energy gap voltage between the output terminal and the non-inverting input terminal of the amplifier. 12 According to the above concept, the energy gap voltage modulation unit is adjusted to rise when 哕 is less than a preset value. The Gap voltage, and to the load is greater than the bandgap ^ lowered to a preset value when the two 'to cancel the first power supply and g

1234329 V. Description of the invention (4) The first power supply is produced in parallel with a light load. According to the above concept, the voltage amplifier is stable. Connected to a soft-start circuit. σ ^ Adjustable amplifier According to the above concept, its _ the soft-start electric current distribution circuit is output to one of the loads, which is used to start the soft-start circuit from the master-slave circuit. # Do not output the voltage to the soft-start. When the second power supply is reduced to the first proportional operation, the surge voltage value generated by the output voltage is equal to the above conception, and the proportional value is 90% ~ 9 ° 5. %. This wood has to explain with the following diagrams and details: t ”brother, won a deeper implementation. Please refer to the second current distribution circuit for the first power supply voltage amplifier 2 1 , Unit 23, current detection 26, and addition unit 27 and 28. The output diagram (a) of the voltage amplifier 21 is a master-slave block diagram of a preferred embodiment of the present case, in which the master-slave current distribution circuit The 2 series of response states ps 1 and the second power supply pS2 are connected in parallel and are connected in series, first, and middle. The master-slave current distribution circuit 2 is a negative feedback circuit composed of resistance = 2 2 and power conversion level measurement. Unit 24, equivalent diode holder, adjustable amplifier, and Active Droop single-input 'power conversion stage unit 23' The input terminal is connected to the electrical output terminal, and the output terminal is connected to a Load, current detection 1234329 V. Description of the invention (5) = Wu 2 ^: The wheel-in terminal is connected to the output terminal of the power conversion stage unit 23 and the negative @ 1-pole body 25 input terminal is connected to the current detection unit 24 The output terminals P, Π / are connected to the first power supply PS1 and the second Power supply evening # The inverting input terminal of the witherable amplifier 26 is connected to the current detection unit and the input terminal of the equivalent diode 25, and the non-inverting input terminal is one; Temple effect—the output terminal of the pole body 25 and The first power supply PS1 and the first power supply PS2, the adding unit 27 is connected to the non-direction = terminal of the voltage amplifier 21 and the output terminal of the adjustable amplifier 26, and the active voltage regulation is early. Then it is connected to the current The output of the detection unit 24. Refer to the second figure (b), which is based on the second figure (a). Formula = modulation: The unit modifies the waveform. The modulation method is that the active voltage is adjusted so that the load is less than At a preset value (light load), one of the operating voltage reference values of the linearly-adjustable M-sleeve type current distribution circuit 3 is 1% to 5% of the maximum value of the output voltage. Operating linear slope, a = i% in the example) '· 5% ~ m (proportional value), this is the recommended operating line' where AV is the voltage range that the master-slave current distribution circuit 3 can use 'and Vo is This output voltage can improve the operating linearity and accuracy of the master-slave current distribution circuit 3, so that The master-slave type electric current distribution circuit 3 can reduce the first power supply ㈣ and the second power supply under a small load and the output voltage difference between the first reactor PS1 and the second power supply PS2 is relatively loose. The error generated when the device ps2 is combined is under a light load condition. Refer to the second figure (a), which is the master-slave of another preferred embodiment of the present invention.

Page 9 1234329 Five 'invention description (6) —' — block diagram of current distribution circuit, in which the master-slave current distribution circuit 3 can also have bandgap voltage reduction unit 3 91 and soft start separately or simultaneously Circuit 392. The energy gap voltage modulation unit 3 92 is connected between the wheel output end of the current detection unit 34 and the non-inverting input terminal of the adjustable amplifier 36 to adjust the output end of the current detection unit 34 and the adjustable type. There is an energy gap voltage between the non-inverting inputs of the amplifier 36. The modulation method is (refer to the third figure (b)), increasing the bandgap voltage when the load is less than a preset value, or lowering the bandgap voltage when the far load is greater than or equal to the preset value. In order to eliminate the instability caused when the first power supply PS1 and the second power supply PS2 are connected in parallel at a light load, and reduce the parallel error between the two at a heavy load. The waveform diagram after the joint error is reduced is shown in the third graph (c), which can be seen / examined. Compared with the first graph (b), the first power supply psi and the second reactor PS2 are connected in parallel regardless of Extremely stable at light or heavy loads. In addition, by feeding back the output voltage of the master-slave current distribution circuit 3 ^ 'to one of the loads to the soft-start circuit 392, the IΓ 软 point of the soft-start circuit 392 (see the third figure ⑷), and The first thunderbolt synchronized with the output voltage is wailed. Τ From f, the second power supply PS2 is hot-plugged during the supply of PS1, resulting in a waveform of the output voltage of power supply PS1. The value of the surge ^ 2 on the value 0 can be seen from the waveform diagram of the third figure (d). When the output voltage is set to point b and synchronized with the starting point of ^ = Road 392, the power supply is turned off and = 9 of output voltage. Reading Ang—the output voltage of power supply PS2

Page 10 1234329 V. Description of the invention (7) '' The repeated value of the surge current on the waveform is effectively suppressed. Therefore, the soft start 392 can not only solve the problem of the power supply PS1 in the parallel system 'when the power supply pSi is normally output, but the power supply PS2 joins the parallel system by hot-plugging (hot-piUgging)'. The output voltage U produces a surge phenomenon of signal overshoot (as shown in the third figure (^)). At the same time, in the conventional technology, in order to solve this problem, a soft-start circuit is added to the master-slave current distribution circuit 1, but the starting point of operation is set at point a in the figure, which is synchronized with the output voltage of the parallel system ν〇, caused by the soft start function is not complete, there are still problems caused by a small surge (as shown in the third figure (f)). Please refer to the fourth figure, which is an actual circuit diagram of a master-slave current distribution circuit according to yet another preferred embodiment of the present invention, in which the master-slave current distribution circuit 4 is actually configured, the bandgap voltage modulation unit 41 and the soft-start circuit The 42 series can be configured separately or simultaneously with the active voltage reduction unit 4 3 to exert the effect of stabilizing the parallel state of the first power supply PS 1 and the second power supply PS 2. This case may be modified by any person skilled in the art, but none of them can be protected as attached to the scope of patent application.

1234329 g-style simple illustration

The first picture (a): The acquaintance-λ is represented by φ "Master-type electricity applied to the parallel system of power supply in the known technology" L distribution circuit; ^ ^ 'Figure (8 ^ before the parallel error is reduced Waveform diagram (without active voltage reduction unit); & Diagram of a master-slave current distribution circuit block diagram of a preferred embodiment of the present case; First diagram (b): According to the second diagram (& ) Drawing of active voltage element modulation glass diagram; Second figure (a): Block diagram of master-slave current distribution circuit (also with bandgap voltage modulation unit and soft-start circuit) ); Figure 2 (b): Modulation of bandgap voltage modulation unit in Figure 3 (a) Figure 3 (c): Waveform / graph after reduction of parallel error in Figure 3 (a); Active Voltage-dropping unit and energy-gap voltage-modulating unit); Figure 2 (d): Soft start waveform of Figure 3 (a); Figure 3 (e): Projection of Figure 1 (a) Waveform waveform diagrams; third diagram (f) ... soft start waveform diagrams of another conventional technique; and fourth diagram: master-slave current distribution Fig. Electricity

1234329 on page 12 Brief description of the diagram The components included in the diagram in this case are listed as follows: I, 2, 3, 4 Master-slave current distribution circuit II, 21, 31 Voltage amplifier 12, 22, 32 Impedance 13, 23 , 33 power conversion stage unit 14, 24, 34 current detection unit 15, 25, 35 equivalent diode 16, 26, 36 adjustable amplifier 17, 27, 37 addition unit 392, 42 soft start circuit 391, 41 can Gap voltage modulation unit 28, 38, 43 Active voltage reduction unit PS1 First power supply PS2 Second power supply

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Claims (1)

1234329 VI. Scope of patent application1. In a master-slave system, the power supply and a first circuit include: a voltage output, a power output, a wheel output end, a current detection element of the output end, an equivalent two p muscle A distribution circuit is applied to a power supply in parallel. The power supply parallel system is at least a first power supply and a power supply connected in parallel. The master-slave current distribution amplifier; a switching unit, an input end of which is connected An output terminal of the voltage amplifier is connected to a load; a measuring unit is connected to the load; a polar body is an output terminal; an output terminal is connected to an adjustable unit; the output input terminal is connected to the system; One addition sheet and the adjustable put one active flow detection unit, in which the linear voltage reference value is borrowed when the value is set, and the device is connected in parallel to the light load 2. If the patented amplifier is applied, its end is equivalent to the equivalent equivalent. An input terminal is connected to the power conversion stage, a single input terminal is connected to the current detection unit and connected to the power supply parallel system; a reverse input terminal is connected to the current detection unit. The input terminal of the diode, a non-inverting output terminal of the non-inverting body and the power supply unit are connected to an output terminal of a non-inverting input terminal of the voltage amplifier; and a voltage regulation; (Active Dr00p) unit, connected to the output terminal of the power; the active voltage regulation unit operates at a load less than a pre-adjustment of the master-slave current distribution circuit to reduce the first power supply and the An error occurs during the second power supply. ’The master-slave current distribution circuit described in item 1 of the range, i Page 14 1234329 6. The voltage is amplified in the scope of the patent application 3. If the patent application makes the negative feedback 4 • The operating voltage 5 in the patent application • The current detection flows to the input terminal 4 in the patent application 4 There is 6 between the ends of the test unit. • The bandgap voltage and the bandgap voltage are applied as in the patent application, and the voltage is eliminated to eliminate the light load. 7 • The voltage amplification circuit is used in the patent application. 8. As in the patent application, one of the output circuits of the soft-start electrical load is synchronized with the reactor and the first surge generator has a negative feedback circuit. The master-slave current distribution circuit described in the second item of the scope, the circuit is composed of an impedance. The reference value of the master-slave current distribution circuit described in item 1 of the range is 1% ~ 5% of the output voltage. The master-slave current distribution circuit described in the first item of the scope, the output end of the unit and the non-inverter of the adjustable amplifier further have a bandgap voltage modulation unit for modulating the electrical output end and the An energy gap voltage of the non-inverting input of the modulation amplifier. ^ The master-slave current distribution circuit described in item 5 above, whose modulation unit raises the load when the load is less than a preset value, and decreases the power supply of the bandgap when the load is greater than or equal to the preset value. The power supply is in parallel with the second power supply in an unstable phenomenon. The master-slave current distribution circuit described in the sixth item of the scope, the 1 device and the adjustable amplifier are further connected to a soft-start circuit, and the master-slave current distribution circuit described in the seventh item of the scope. Master-slave current distribution circuit /, to the soft-start circuit, start the soft-start 时 = when the supplier works, power is generated at this wheel ΐ = 1234329 VI. Scope of patent application 9. The master-slave current distribution circuit as described in item 8 of the scope of patent application, where the ratio is 90% ~ 95%. Page 16