TWI399900B - Multi - power balance system - Google Patents

Description

Multiple power balance system

A multi-power balancing system, in particular a system for adjusting the output ratio of a plurality of power circuits using a proportional distribution circuit.

If the power supply source is unstable during the operation of the computer equipment, the system will be abnormally shut down or the data will be damaged. In severe cases, the body will be damaged and the loss will be difficult to estimate. To avoid this, computer equipment can use a multiple power supply to form a Redundant Power Supply. The backup power system includes more than two power supplies and a backplane, each power supply provides an output power, and the backplane connects the power supplies to integrate all the output power drives to the backup. The load of the power system. When one of the power supplies fails and the output is abnormal, the power required by the load can be shared by other power supplies, and the faulty power supply is replaced with a normal power supply. Or, if the power supply of the other power supply is sufficient, the load power is directly provided by the remaining power supply to temporarily increase the output power.

The conventional backup power system architecture is shown in FIG. 1. In FIG. 1, two power supplies 1 are connected to a backplane 91. The two power supplies 1 are respectively connected to a power source 90 to obtain an input power. Input power is rectified through one of the power supply 1 After the element 11 and the power factor correcting unit 12, at least one power switch 14 is controlled by a pulse width control unit 15 to adjust the power passing through a transformer 13, and is output to the backplane 91 through another rectifying unit 16 on the secondary side of the transformer 13. . In order to balance the current output from the two power supplies 1 to the backplane 91, a diode 17 for preventing current backflow and a current balancing unit 18 are also included at the rear end of the rectifying unit 16. The current balancing unit 18 is connected to the backplane 91. The backplane 91 is provided with a line for connecting the plurality of current balancing units 18. When the output current of the power supply 1 is unbalanced, a feedback signal is supplied from the current balancing unit 18 to a power feedback unit 19 to feedback the output of the pulse control unit 15 to further maintain the power supply 1 Output current balance.

Another prior art, such as U.S. Patent No. 7,739,525, discloses a system comprising a plurality of power supplies, each of which has the ability to be hot drawn. It can be seen in Figure 1 that a plurality of power supplies (12a-12d) are connected to a current control feedback device (15). A plurality of power supplies (12a~12d) are connected to the current control feedback device (15), and the output is adjusted through a current sensor (20) in the power supply (12a-12d).

A similar prior art can also be found in U.S. Patent No. 7,425,779, which also utilizes a backplane and multiple power supplies to form a redundant power system with fault tolerance.

However, systems that accommodate multiple sets of power supplies and a backplane are bulky and costly, and it is wasteful to use such a large redundant power supply for small electronic systems. However, in the conventional technology, if the backplane is used to integrate multiple sets of power supplies, even if the specifications of the power supply are the same, some of the parts are The micro-difference will eventually cause the output voltage to be slightly different. Due to the imbalance of voltage and current, the power supply with higher output voltage will have to bear the heavier power demand, which will obviously affect the life of the power supply for a long time. Integrating multiple sets of power supplies will make it difficult to control the output balance of the power supply, creating a dilemma between cost and stability in the design of the backup system.

Due to the difference in output voltage caused by the power supply's part error, the parallel power supply will be damaged early due to output imbalance without using the backplane. Therefore, the purpose of the present invention is to provide a system for paralleling multiple power supply circuits, and having a proportional distribution circuit that can be adjusted, and adjusting the output ratio of the plurality of power supply circuits through the proportional distribution circuit to reduce the manufacturing of each power supply circuit. Output error, the multi-power circuit does not need to pass the backplane control to achieve output balance.

The present invention is a multi-power balance system, which is provided on a circuit substrate with a plurality of power supply circuits each having a power supply path, each power supply circuit each includes a power feedback unit, and the power feedback unit has a decision The reference level of the power circuit output voltage level. The circuit substrate further has an output path electrically connected to the power supply paths to collect current output to a load. Therefore, the circuit substrate has a power circuit in which a plurality of parallel arrays are connected in parallel. In order to correct the error of the output of each power circuit, a proportional distribution circuit is further disposed on the circuit substrate, and the proportional distribution circuit has a variable impedance component electrically connected to the reference levels, and the impedance component can be controlled. The ratio is changed from the equivalent impedance of each reference bit terminal to proportionally change the output voltage level of each power supply circuit. .

Therefore, the multi-power balance system provides multiple sets of power supply circuits in parallel to achieve mutual backup. The proportional distribution circuit can pre-adjust the output ratios of the power supply circuits to reduce output errors between the power supply circuits. Achieve balanced output without backplane coordination.

1‧‧‧Power supply

10‧‧‧Power circuit

100‧‧‧Power supply path

11‧‧‧Rectifier unit

12‧‧‧Power factor correction unit

13‧‧‧Transformers

14‧‧‧Power switch

15‧‧‧ Pulse Width Control Unit

16‧‧‧Rectifier unit

17‧‧‧ diode

18‧‧‧Current balance unit

19‧‧‧Power feedback unit

190‧‧‧ reference level

191‧‧‧Resistors

192‧‧ ‧ diode

2‧‧‧Proportional distribution circuit

21‧‧‧Variable resistor

211‧‧‧ first end

212‧‧‧ second end

213‧‧‧ movable end

22‧‧‧Output feedback unit

221‧‧‧voltage resistor

222‧‧‧Operational Amplifier

3‧‧‧Output path

90‧‧‧Power source

91‧‧‧ Backplane

1 is a circuit block diagram of a prior art.

Figure 2 is a block diagram of the circuit of the present invention.

FIG. 3 is a schematic diagram of the implementation of the proportional distribution circuit.

This case is a multi-power balance system. The technical content of this case will be explained below with the drawings. Referring to FIG. 2, the multi-power balance system has a circuit substrate, and a plurality of power circuits 10 each having a power supply path 100 are disposed on the circuit substrate. Since the power supply circuits 10 are disposed on the same circuit substrate, they are connected to the backplane in a pluggable manner from a conventional independent power supply. A preferred embodiment is shown in FIG. 2. Two sets of power supply circuits 10 are provided on the circuit substrate. Each power supply circuit 10 includes a rectifying unit 11, a power factor correcting unit 12, a transformer 13, at least one power switch 14 connected to the primary side of the transformer 13, and a pulse width control unit for driving the power switch 14 to turn on the timing. 15. The rectifying unit 11 obtains an input power from a power source 90, and is modulated by the rectifying unit 11 and the power factor correcting unit 12, and the power switch 14 controls the power switch 14 to adjust the power passing through the transformer 13. The power supply path 100 is located on the secondary side of the transformer 13, and the power sensed on the secondary side of the transformer 13 The output power of the power supply circuit 10 is finally provided by the power supply path 100 via rectification of another rectifying unit 16 and a diode 17 . Therefore, the two power supply circuits 10 shown in FIG. 1 provide output power to the power supply path 100 through the above-mentioned known power modulation technology. The circuit substrate further includes an electrical connection between the power supply paths 100 and a current output to a load. Output path 3. In order to control the output power of the power circuit 10, the power circuit 10 further includes a power feedback unit 19, and the power feedback unit 19 outputs a feedback signal to the pulse width control unit 15 to adjust the driving of the power switch 14. Turn-on timing. According to the prior art, the feedback signal of the power feedback unit 19 can change the output power provided by the power circuit 10. The power feedback unit 19 has an output feedback terminal electrically connected to the power supply path. 100, and changing the size of the feedback signal according to the power detected by the output feedback terminal.

However, even if the specifications of the two power supply circuits 10 are the same, the component error between the two power supply circuits 10 causes a difference in the output between the two. Therefore, the power supply feedback unit 19 has a reference level terminal 190 for determining the output voltage level of the power circuit 10, and the circuit substrate has a proportional distribution circuit 2. The reference level terminal 190 of the power supply circuit 10 is connected to the proportional distribution circuit 2, and a resistor 191 and a diode 192 are further connected between the reference level terminal 190 and the proportional distribution circuit 2. The reference level terminal 190 only allows current to flow in one direction. The proportional distribution circuit 2 has a variable impedance element electrically connected to the reference level terminals 190, and the impedance element can be controlled to proportionally change the equivalent impedance connected from each reference level terminal 190, so that the impedance element The change ratio also synchronously changes the equivalent impedance of the reference level terminals 190. therefore, The connection of each reference level terminal 190 to a different equivalent impedance also causes each power supply feedback unit 19 to drive the power supply circuit 10 to produce a different output voltage level. The intention is that, even if the original power supply circuits 10 have the same specifications, the output power voltage generated under many component errors will of course be slightly different. Therefore, the proportional distribution circuit 2 can adjust the equivalent impedance connected to each reference level terminal 190 to proportionally change the output voltage level of each power supply circuit 10.

Through the above technology, the two power supply circuits 10 shown in FIG. 2 can be integrated on the same circuit substrate, and the error of the output of the two power supply circuits 10 can be minimized through the proportional distribution circuit 2 at the time of shipment to achieve It is necessary to coordinate the output of the two power supply circuits 10 through the backplane coordination.

Referring to FIG. 3, the proportional distribution circuit further includes an output feedback unit 22 electrically connected to the impedance element in addition to the variable impedance element. The variable impedance component can be a general variable resistor 21, which is matched with a reference level terminal 190 of the two power supply circuits. The variable resistor 21 can have a first end 211, a second end 212, and a movable end 213. Type. The first end 211 and the second end 212 are respectively connected to different reference level ends 190, and the position of the movable end 213 is divided into a first internal resistance and a second inner side which are inversely proportional to each other. Resistance. The first internal resistance is the impedance between the first end 211 and the movable end 213, and the second internal resistance is the impedance between the second end 212 and the movable end 213, the first internal resistance, One end of the second internal resistance (ie, the first end 211 and the second end 212) are respectively connected to the different reference level ends 190, and the first internal resistance and the second internal resistance are connected to the other end (the movable end 213). The output is fed back to unit 22. The output feedback unit 22 includes a plurality of voltage dividing resistors 221 and an operational amplifier 222, the voltage dividing resistors 221 are connected to the output path 3 to provide a voltage division to the operational amplifier 222. The operational amplifier 222 obtains the voltage division of the voltage dividing resistors 221 and converts them into a voltage signal. The operational amplifier 222 determines the magnitude of the voltage signal by the voltage division. In the aspect of FIG. 3, the voltage signal outputted by the operational amplifier 222 is set lower than the reference level terminal 190, so that the current flowing through the reference level terminals 190 is turned on along the diodes 192. direction. Of course, the voltage of the operational amplifier 222 can also be set higher than the reference level terminal 190, and the direction in which the diodes 192 are connected can be opposite to that of FIG. The voltage signals respectively cause the reference level terminals 190 to generate a current, so that each power supply feedback unit 19 determines the voltage level output by the power supply circuit 10 by the current level of the reference level terminal 190.

The variable resistor 21 is used to achieve output balance between the power supply circuits 10, and after the output balance of the two power supply circuits 10 is reached, the variable resistor 21 also needs to cooperate with the output feedback unit 22 to achieve the synchronous correction reference level. When the multi-power balance system is in operation, the output feedback unit 22 detects the power output to the load on the output path 3. When the power output to the load fluctuates, the voltage signal output by the operational amplifier 222 is generated. Correspondingly, the voltage signal generates a current through the variable resistor 21 and the resistor 191 and the diode 192. Since the two power supply circuits 10 have been adjusted and balanced at the time of shipment, the variable resistors 21 are fixed at this time, and are equivalent to the different reference level terminals 190 respectively connecting the first internal resistance and the second internal resistance. The voltage signal causes the reference level terminal 190 to generate a current, so that the two power supply feedback units 19 are respectively triggered by different currents of the two reference level terminals 190, and the output voltage levels of the two power supply circuits 10 are respectively adjusted. In the When the impedance ratio of the variable resistor 21 does not fluctuate, the output voltage level of the power supply circuit 10 can be changed in synchronization and in a proportional manner. For example, when the variable resistor 21 does not change, the output voltage ratio of the two power supply circuits 10 does not change, and when the voltage output from the output path 3 decreases, the voltage signal generated by the output feedback unit 22 can be Let the two power supply circuits 10 increase the output together with the ratio unchanged, and let the voltage output from the output path 3 rise.

Through the above-mentioned technology, the two power supply circuits 10 can be integrated on the same circuit substrate, and the error of the output of the two power supply circuits 10 can be minimized through the proportional distribution circuit 2 at the time of shipment, so as to achieve no need to coordinate through the backplane. The two power supply circuits 10 can output a balanced effect. Although the present application has been disclosed above in the preferred embodiments, it is not intended to limit the application. Any changes and refinements made by those skilled in the art without departing from the spirit and scope of the present application should be covered in this application. Therefore, the scope of protection of this application is subject to the scope of the appended patent application. The definition is final.

In summary, the application of this application enhances the above-mentioned effects more well than the customary creations. It should fully comply with the novelty and progressive statutory innovation patent requirements, and apply for it according to law. You are requested to approve the invention patent application. To the sense of virtue.

10‧‧‧Power circuit

100‧‧‧Power supply path

11‧‧‧Rectifier unit

12‧‧‧Power factor correction unit

13‧‧‧Transformers

14‧‧‧Power switch

15‧‧‧ Pulse Width Control Unit

16‧‧‧Rectifier unit

17‧‧‧ diode

19‧‧‧Power feedback unit

190‧‧‧ reference level

191‧‧‧Resistors

192‧‧ ‧ diode

2‧‧‧Proportional distribution circuit

3‧‧‧Output path

90‧‧‧Power source

Claims (7)

A multi-power balance system is provided on a circuit substrate: a plurality of power supply circuits each having a power supply path, each power supply circuit each includes a power feedback unit, and the power feedback unit has a power supply a reference level terminal of the circuit output voltage level; an output path electrically connected to the power supply paths and collecting the current output to a load; a proportional distribution circuit having a variable connection connecting the reference levels And an output feedback unit electrically connected to the variable impedance element and the output path, the impedance element being controllably proportionally changing an equivalent impedance connected from each reference level, the output The feedback unit detects a current outputted to the load from the output path to generate a voltage signal, the voltage signal causes the reference level terminals to generate a current, and the power feedback unit determines the power circuit output by the current of the reference terminal. The voltage level. The multi-power balance system of claim 1, wherein the circuit board is provided with two sets of power circuits. The multi-power balancing system of claim 1, wherein the output feedback unit includes an operational amplifier that outputs the voltage signal, and a plurality of voltage dividing resistors are coupled to the output path to provide a voltage division to the operational amplifier. The operational amplifier determines the magnitude of the voltage signal by the voltage division. A multi-power balancing system as described in claim 1, wherein the impedance The component is a variable resistor. The multi-power balance system of claim 4, wherein the variable resistor has a first internal resistance that varies inversely, and a second internal resistance is respectively connected to the different reference level, and the An internal resistance and a second internal resistance are connected to the output feedback unit. The multi-power balance system of claim 1, wherein the power circuit comprises a transformer, at least one power switch connected to a primary side of the transformer, and a pulse width control unit for driving the power switch on-time. The power supply path is located on the secondary side of the transformer, and the power feedback unit outputs a feedback signal to the pulse width control unit to adjust the turn-on timing of driving the power switch. The multi-power balance system of claim 6, wherein the power feedback unit has an output feedback terminal electrically connected to the secondary side of the transformer, and the power detected by the output feedback terminal is And change the size of the feedback signal.