TWI630786B - Redundant power supply - Google Patents

Abstract

A backup power supply device includes at least two power connection terminals, at least two power supply units, and a common component. Each of the power connection ends is connected to an AC power source. Each of the power supply units has an input side, and the at least two power supply units have a common output side, and the input sides of the at least two power supply units are respectively connected to the at least two power connection ends, and respectively convert the corresponding AC power sources into Streaming power. The common component is connected to the common output side and receives the DC power. Thereby, the reliability of the backup power supply device operating on different input power sources can be improved without using a mechanical switch.

Description

Redundant power supply

This creation relates to a power supply device, especially a redundant power supply device.

As shown in FIG. 6, in the field of the backup power supply of the prior art, a plurality of independent input power sources AC1 and AC2 are usually connected through a switching device 51. The switching device 51 selects one of the input power sources AC1 as the main input power source and the other input power source AC2 as the secondary and secondary input power sources. When the main input power source AC1 is normally operated, the selected main input power source AC1 is received by a power supply unit 52 and converted by the power supply unit 52 into a working power source. The power of the working power source to a servo system is The load is powered. For convenience, the load will be represented by a load 50 below. If the main input power source AC1 cannot meet the power supply requirements and standards, such as a power failure or abnormality, the switching device 51 is switched to select a secondary or secondary input power source AC2 that can meet normal operation requirements. The power supply requirements or standards may allow an instantaneous or near instantaneous determination of the power supply's power supply capability based on the measured AC voltage level or DC voltage level, AC frequency, or other tracking methods.

The switching device 51 may be an electromechanical relay, a semiconductor switch, or a combination thereof. Based on safety considerations, in order to avoid the short circuit caused by the instantaneous connection of two or more input power sources at the same time, the operating principle of switching between different input power sources is the switching device 51 "break before make" So that two or more input power sources can be switched completely independently of each other. In other words, the input power sources AC1, AC2 cannot be connected together directly or indirectly through an electrical path, such as an ohmic path. Furthermore, uncontrolled currents can cause dangerous conditions in system engaging components such as circuit breakers or fuses.

An AC voltage can be applied to the AC voltage through a connector, such as a pin of an AC power cord. International agencies require electrical equipment connected to utility power to meet specific design requirements to provide user safety and approval. The switching device 51 must also be able to quickly switch from one input power source to another input power source, so that the operation of power conversion is not interrupted, and a redundant power system capable of continuously supplying input power is achieved. The switching device 51 used is typically referred to as an automatic voltage switch (AVS) or an automatic transfer switch (ATS), or other terms with the same function.

U.S. published patent 5,939,799 discloses a uninterruptible power supply with a transfer switch. Referring to FIG. 7, a power conversion switch 63 is connected between two power sources and an AC-to-DC converter. The two power sources are a first power source 61 and a second power source 62 respectively. The power transfer switch 63 is controlled by a switch controller 65 and is used to select to receive the first power source 61 or the second power source 62.

US published patent 2014/0077602 discloses a power supply system and a control method thereof. Please refer to FIG. 8 and FIG. 9. A circuit switch module 73 is connected between two power sources and a controllable AC-to-DC conversion module 74. The two power sources are a first AC power source 71 and a second power source. AC power source 72. The circuit switch module 73 is controlled by a control module 75, so that the circuit switch module 73 is switched to be connected to the first AC power source 71 or to the second AC power source 72.

U.S. Published Patent 2015/0123473 discloses a uninterruptible power supply with a power module having an internal automatic transfer switch. As shown in FIG. 10, an automatic transfer switch 83 is connected to two AC power sources, namely a first AC power source 81 and a second AC power source 82, and is further connected to a power factor corrector 84 and a direct current to direct current. Converter 85. The automatic transfer switch 83 is controlled by a micro-controller unit (MCU) 86 to determine whether the first AC power source 81 or the second AC power source 82 is transmitted to the power factor corrector 84 and The DC-to-DC converter 85.

U.S. published patent 6,630,753 discloses a low-cost redundant AC-to-DC power supply. Please refer to FIG. 11, two power sources, that is, a first power source 91 and a second power source 92 are connected to the bridge rectifiers 93 and 94 through a line between the silicon controlled rectifiers 95 and 96. There is no galvanic isolation between the first power source 91 and the second power source 92, so the system operates at a low cost, which will easily cause the possibility of short-circuit failure of the device.

However, for the aforementioned power transfer switch, circuit switch module and automatic transfer switch, since the switch itself is a mechanical structure, its reliability is not high, and compared to electrical switches, due to contact welding or limited operating temperature range The factors are more prone to mechanical failure.

The purpose of this creation is to provide a redundant power supply device that solves the problem of reduced reliability caused by the use of a mechanical switch in the operation of a redundant power system.

In order to achieve the purpose of the previous disclosure, the redundant power supply device proposed in this creation includes at least two power connection terminals, at least two power supply units, and a common connection component. Each of the power connection terminals is connected to an AC power source. Each of the power supply units has an input side, the at least two power supply units have a common output side, each of the input sides is connected to the power connection terminal, and each of the power supply units converts the AC power source into a DC power source. The common component is connected to the common output side and receives the DC power.

With the redundant power supply device, without using a mechanical switch, the reliability of the redundant power supply device operating at different input power sources can be improved.

In order to better understand the techniques, methods and effects adopted by this creation to achieve the intended purpose, please refer to the following detailed descriptions and drawings of this creation. Specific understanding, however, the drawings are provided for reference and explanation only, and are not intended to limit the creation.

The technical content and detailed description of this creation are described below in conjunction with the drawings.

Please refer to FIG. 1 and FIG. 2. In the present invention, a redundant power supply device 100 includes a first power supply unit 11, a second power supply unit 12, and a common component 60. The first power supply unit 11 and the second power supply unit 12 have a common output side. The common component 60 is connected to the common output side. The first power supply unit 11 and the second power supply unit 12 are used to provide a power load of a server system (hereinafter referred to as a load 50). The redundant power supply device 100 is a modular structure, that is, the first power supply unit 11 and the second power supply unit 12 are installed in a casing 10, or a casing or a chassis. To form the modular structure. The first power supply unit 11 and the second power supply unit 12 are two power supply units with identical circuit structures. The redundant power supply device 100 includes a first power connection terminal 21, a second power connection terminal 22, and a plurality of DC output terminals 30.

The first power supply unit 11 has an input side and an output side. The input side of the first power supply unit 11 is connected to the first power connection terminal 21, and the first power connection terminal 21 is provided to connect a first AC power source AC1, wherein the first AC power source AC1 may be an external AC power, whereby the first power supply unit 11 receives the first AC power AC1, and converts the first AC power AC1 into a first DC power, and outputs the The side outputs the first DC power.

The second power supply unit 12 has an input side and an output side. The input side of the second power supply unit 12 is connected to the second power connection terminal 22, and the second power connection terminal 22 is provided to connect a second AC power source AC2, wherein the second AC power source AC2 may be an external AC power, whereby the second power supply unit 12 receives the second AC power AC2, and converts the second AC power AC2 into a second DC power, and is on the output side of the second power supply unit 12 This second DC power is output. Therefore, through multiple input power sources, two AC power sources are used in this embodiment, which can improve power supply reliability.

In addition, the redundant power supply device 100 further includes a heat dissipation module. As shown in FIG. 1, the heat dissipation module may include a plurality of cooling fans 41 and 42, and the cooling fans 41 and 42 are installed in the casing 10 to dissipate heat from the casing 10 to the outside. In addition, the heat dissipation module can also use a heat sink or other methods to provide heat dissipation, so that all components installed in the casing 10 can operate in the environment of its maximum allowable temperature.

In the following, different implementations of the first power supply unit 11 and the second power supply unit 12 according to the present invention will be presented in the form of a circuit block diagram and a corresponding circuit block diagram.

As shown in FIG. 3A and FIG. 3B, the first power supply unit 11 of the redundant power supply device 100 of the present invention includes a first step-up power factor correction unit 111, a first isolated DC conversion unit 112, and A first isolated measurement and control unit 113. The second power supply unit 12 includes a second step-up power factor correction unit 121, a second isolated DC conversion unit 122, and a second isolated measurement and control unit 123.

The first boost-type power factor correction unit 111 has an input side and an output side. The input side of the first boost-type power factor correction unit 111 is used as the input side of the first power supply unit 11. The first AC power source AC1 is received. The second boost-type power factor correction unit 121 has an input side and an output side, wherein the input side of the second boost-type power factor correction unit 121 is used as the input side of the second power supply unit 12 to This second AC power source AC2 is received.

As shown in FIG. 3B, the redundant power supply device 100 has a transformer having two primary-side windings and primary-side windings, which are used to provide safety isolation. The two primary-side windings are respectively connected to a semiconductor switch having a two-arm structure to form the first isolated DC conversion unit 112 and the second isolated DC conversion unit 122. The secondary-side winding system provides a primary-side common connection element 124 to form a common output structure.

In this embodiment, the secondary-side common connecting element 124 is the common-connecting element 60, that is, the primary-side core (not shown) of the transformer and the secondary-side winding around the secondary-side core. The windings form the common connection element 60. The secondary-side iron core and the secondary-side winding wound on the secondary-side iron core, that is, the secondary-side common connection element 124 is connected to the secondary side of each of the isolated DC conversion units 112, 122 to provide the load. 50-powered common output path.

The casing 10 is connected to the two AC power sources AC1 and AC2 through the two power connection terminals 21 and 22, so that the first AC power source AC1 and the second AC power source AC2 respectively correspond to the first step-up power factor correction unit 111. Power is fed to the second step-up power factor correction unit 121. The two boost-type power factor correction units 111, 121 feed the two isolated DC conversion units 112, 122, respectively, and then power the load 50. The two isolated DC conversion units 112 and 122 include the secondary-side common connection element 124 having an energy storage function, the secondary-side iron core, the secondary-side winding, a dual-arm structured diode, and an output rectification inductor and capacitor.

The redundant power supply device 100 further includes a primary-side control unit 125. The secondary-side control unit 125 is coupled to the first isolated measurement and control unit 113 and the second isolated measurement and control unit 123. For example, the secondary-side control unit 125 is correspondingly coupled to the first isolated measurement and control unit 113 and the second isolated measurement and control unit 123 through an optical coupler. The secondary-side control unit 125 receives voltage or current information, such as output voltage information related to the load 50, and input voltage or output voltage information of the two power supply units 11,12, but it is not limited thereto.

For example, the secondary-side control unit 125 can control the first isolated measurement and control unit 113 and the second isolated measurement and The control unit 123 controls the first power supply unit 11 and the second power supply unit 12 respectively. The first isolated measurement and control unit 113 and the second isolated measurement and control unit 123 control the first isolated DC conversion unit 112 and the first correspondingly in a pulse width modulation (PWM) manner. Two isolated DC conversion units 122.

The secondary-side control unit 125 controls the first isolated DC conversion unit 112 and the second isolated DC conversion unit 122 to adjust the secondary-side voltage so that each of the power supply units 11 and 12 can be controlled by the corresponding one. Each of the isolated measurement and control units 113, 123 controls to output 0 to 100% output power, respectively. For example, since each of the power supply units 11 and 12 can supply about 50% of the power to the load 50, the total stored energy only needs to be reduced to half during the hold up time during normal operation.

In the following, the data is taken as an example to facilitate the description of the technology for creating the redundant power supply device 100 in the present invention. It is assumed that the rated output powers of the first power supply unit 11 and the second power supply unit 12 are 2000 watts respectively, and are used to provide the power required by the load 50. Furthermore, it is assumed that when the first AC power source AC1 is normally powered, the secondary-side control unit 125 of the redundant power supply device 100 controls the first power supply through the first isolated measurement and control unit 113 The first AC power source AC1 received by the unit 11 is converted by the first power supply unit 11 and then output through the common output side and finally through the secondary side common connection element 124 to provide the load 50 required. power.

At this time, the secondary-side control unit 125 controls the second power supply unit 12 to a standby state or a standby mode through the second isolated measurement and control unit 123, so that The second AC power source AC2 received by the second power supply unit 12 cannot complete power conversion through the second power supply unit 12 and therefore cannot be transmitted to the common output side. That is, the power required by the load 50 is completely provided by the first power supply unit 11.

Furthermore, if the first AC power source AC1 is abnormally powered (powered off), the second power supply unit 12 cooperatively joins and supplies power to the load 50. Under this condition, the secondary-side control unit 125 controls the second AC power source AC2 received by the second power supply unit 12, is converted by the second power supply unit 12, and passes through the common output side. , And finally output through the secondary-side common connection element 124 to provide the power required by the load 50. At this time, the secondary-side control unit 125 controls the first power supply unit 11 to a standby state, so that the first AC power supply AC1 received by the first power supply unit 11 cannot pass through the first power supply. The supply unit 11 completes the power conversion, so it cannot be transmitted to the common output side. That is, the power required by the load 50 is completely provided by the second power supply unit 12.

In another embodiment, the redundant power supply device 100 can also be operated when the first AC power source AC1 and the second AC power source AC2 are both normal. Both the first power supply unit 11 and the second power supply unit 12 can provide an output with a rated output power of 0 to 100%. By performing power distribution on the first AC power supply AC1 and the second AC power supply AC2, the first power supply unit 11 and the second power supply unit 12 jointly share the power required by the load 50.

Furthermore, when both the first AC power supply AC1 and the second AC power supply AC2 are normally powered, the OR'ing switch can be controlled to control the first power supply unit 11 or the second power supply unit 12 to independently The load 50 supplies power. In other words, when the first power supply unit 11 is used to supply power to the load 50, the second power supply unit 12 is in the standby state; otherwise, when the second power supply unit 12 is used to supply power to the load 50 The first power supply unit 11 is in the standby state.

For example, when the first power supply unit 11 is used to completely supply power to the load 50, the first isolated measurement and control unit 113 controls the semiconductor switch in the first isolated DC conversion unit 112 to The switching operation is performed, and the second isolated measurement and control unit 123 controls the semiconductor switch in the second isolated DC conversion unit 122 to be in an off state. Conversely, when the second power supply unit 12 is used to completely supply power to the load 50, the second isolated measurement and control unit 123 controls the semiconductor switch in the second isolated DC conversion unit 122 for a switching operation. The first isolated measurement and control unit 113 controls a semiconductor switch in the first isolated DC conversion unit 112 to be in an off state.

In addition, the semiconductor switches in the first isolated DC conversion unit 112 and the second isolated DC conversion unit 122 can also be controlled for switching operation at the same time, so that the first power supply unit 11 and the second power supply unit 12 The loads 50 may be collectively powered.

As shown in FIG. 3A and FIG. 3C, this embodiment includes a DC-DC converter architecture, which includes more than two primary-side circuits and one secondary-side circuit, wherein each of the primary-side circuits has an inductance-inductance-capacitance (LLC) ) Converter to share power or provide backup. The first power supply unit 11 includes a first step-up power factor correction unit 131 and a first LLC DC converter 132. The second power supply unit 12 includes a second step-up power factor correction unit 141 and a second LLC DC converter 142. In this embodiment, as shown in FIG. 3A, the first isolated measurement and control unit 113, the second isolated measurement and control unit 123, and the secondary-side control unit 125 are used to control the first The LLC DC converter 132 and the second LLC DC converter 142.

The first boost-type power factor correction unit 131 has an input side and an output side. The input side of the first boost-type power factor correction unit 131 is used as the input side of the first power supply unit 11. The first AC power source AC1 is received. The second boost-type power factor correction unit 141 has an input side and an output side, wherein the input side of the second boost-type power factor correction unit 141 is used as the input side of the second power supply unit 12 to This second AC power source AC2 is received.

When any input power source fails or fails, the other input power sources can be smoothly switched to connect to other normal input power sources to provide backup power and improve power supply reliability. In this creation, a redundant architecture with dual input power sources includes two sets of LLC DC converters 132,142, and the input power is converted by using energy storage elements connected to the two sets of LLC DC converters 132,142. At the same time, by adjusting the input voltages of the first LLC DC converter 132 and the second LLC DC converter 142, the power supply required by the user is provided.

The first LLC DC converter 132 is connected to the output side of the first step-up power factor correction unit 131, and the second LLC DC converter 142 is connected to the output side of the second step-up power factor correction unit 141. In this embodiment, the primary side common connection structure of the single transformer 143 can reduce the use of components and simplify the control circuit design.

As shown in FIG. 3C, the first LLC DC converter 132 and the second LLC DC converter 142 share the same inductor 143 as the coupling inductors L12, L22, L3, and L4. The four coupled inductors L12, L22, L3, and L4 are formed by windings wound on a common core. Each of the LLC DC converters 132 and 142 has its own capacitors C3 and C4 for storing energy.

The two capacitors C3 and C4 are respectively supplied by a first capacitor voltage V1 and a second capacitor voltage V2. The first capacitor voltage V1 is an output voltage of the first boosted power factor correction unit 131, and the second capacitor voltage V2 is an output voltage of the second boosted power factor correction unit 141. Diodes connected to the capacitors C3 and C4 prevent power from being fed back from the output side to the input side. The two-pole system shares the diodes of the first boost-type power factor correction unit 131 and the second boost-type power factor correction unit 141, or an externally connected diode. The first LLC DC converter 132 and the second LLC DC converter 142 each have two switches, each of which is controlled by a 50% duty cycle. The first LLC DC converter 132 has two switches M1, M2, and the second LLC DC converter 142 has two switches M3, M4.

In this embodiment, the switch M1 and the switch M3 are controlled by the same signal, and the switch M2 and the switch M4 are controlled by the same signal. If the corresponding input power fails or is removed, the switches M1 and M2 or the switches M3 and M4 are no longer switched. Under normal power supply, if the first capacitor voltage V1 is the same as the second capacitor voltage V2, the two LLC DC converters 132, 142 operate in parallel to share power. Since each of the LLC DC converters 132 and 142 has the inherent property of finite impedance, the sharing of current and power is controlled depending on the value of the device with the inherent property.

In this embodiment, only one set of secondary side (output side) is used, so fewer components are used. Therefore, by using a DC isolation transformer and sharing the same set of secondary components and windings, the combination of input power can be achieved with fewer components.

The LLC DC-to-DC converters 132,142 operate under resonance with a load impedance such that a higher output current and a lower output voltage are provided at the load 50. A circuit with a finite load impedance can be represented by the voltage series output impedance as having the ability to share current. For a multi-winding LLC with independent primary-side resonance inductance, it can be realized through the leakage inductance of a solid inductor or transformer (in conjunction with the resonance capacitors C1, C2). Therefore, multiple primary-side windings with switching circuits can be controlled by the same PWM signal to form a parallel circuit architecture. In this embodiment, as shown in FIG. 3A, the secondary-side control unit 125 is used to control the first isolated measurement and control unit 113 and the second isolated measurement and control unit 123 to stop switching. Partially or completely switch the primary-side switching circuit to separate the input power.

In this embodiment, the primary-side voltage of each of the LLC DC converters 132 and 142 can be controlled and adjusted to control the power supply ratio of each input power source. The turns ratio and resonance value of the primary-side winding can be adjusted so that input power sources of different voltages can share the same power. The two primary-side circuits can be completely isolated from each other, and each primary-side circuit can also provide auxiliary power for backup.

In this embodiment, the secondary-side control unit 125 only needs a feedback signal and method to control the switching behavior of the LLC DC converters 132 and 142. For example, according to two primary-side DC voltages, that is, the first capacitor voltage V1 and the second capacitor voltage V2, the frequency can be controlled through frequency control, duty cycle control, or hysteretic on / off. Control mode to control two or more primary-side switches M1-M4 independently or identically.

As shown in FIG. 4A and FIG. 4B, the first power supply unit 11 of the redundant power supply device 100 of the present invention includes a first step-up power factor correction unit 311 having a storage capacitor 31C and a first Bidirectional DC transformer 312. The second power supply unit 12 includes a second step-up power factor correction unit 321 having an energy storage capacitor 32C and a second bidirectional DC transformer 322. The two-way DC transformer is used to convert a DC voltage into a high-frequency AC voltage, and then convert the high-frequency AC voltage into another DC voltage.

The first step-up power factor correction unit 311 has an input side and an output side, wherein the input side forms the input side of the first power supply unit 11 to receive the first AC power supply AC1. The first two-way DC transformer 312 has a first side and a second side, wherein the second side forms the output side of the first power supply unit 11 to output the first DC power. The first side of the first bidirectional DC transformer 312 is connected to the output side of the first step-up power factor correction unit 311 to form a series connection structure.

The second step-up power factor correction unit 321 has an input side and an output side, wherein the input side forms the input side of the second power supply unit 12 to receive the second AC power source AC2. The second two-way DC transformer 322 has a first side and a second side, wherein the second side forms the output side of the second power supply unit 12 to output the second DC power source. The first side of the second bidirectional DC transformer 322 is connected to the output side of the second step-up power factor correction unit 321 to form a series connection structure.

Please refer to FIG. 1. The casing 10 is connected to the two AC power sources AC1 and AC2 through the two power connection terminals 21 and 22, so that the first AC power source AC1 and the second AC power source AC2 are respectively connected to the first The boosted power factor correction unit 311 and the second boosted power factor correction unit 321 feed power. The two boost power factor correction units 311 and 321 feed the two bidirectional DC transformers 312 and 322, respectively. Each of the energy storage capacitors 31C and 32C is connected to the first side of the corresponding bidirectional DC transformer 312, 322, respectively, and the second side of each of the bidirectional DC transformers 312, 322 is connected to a common capacitor 323, which will be described later. The total energy storage of the common capacitor 323 is much smaller than the total energy storage of each of the energy storage capacitors 31C and 32C.

In addition, the first bidirectional DC transformer 312 and the second bidirectional DC transformer 322 can provide bidirectional power transmission, that is, the power output by the first power supply unit 11 can pass through the second bidirectional DC transformer 322 The side is transmitted to the second power supply unit 12. Similarly, the power output by the second power supply unit 12 can be transmitted to the first power supply unit 11 through the second side of the first bidirectional DC transformer 312.

Specifically, the energy storage capacitor 31C of the first step-up power factor correction unit 311 can store the energy transmitted by the second power supply unit 12 and via the first bidirectional DC transformer 312. Similarly, the energy storage capacitor 32C of the second step-up power factor correction unit 321 can store the energy transmitted by the first power supply unit 11 and via the second bidirectional DC transformer 322. Therefore, the energy stored in the energy storage capacitors 31C, 32C can be shared with each other through the bidirectional DC transformers 312, 322.

The output side of the first power supply unit 11, that is, the output side of the first bidirectional DC transformer 312 is connected to the output side of the second power supply unit 12, that is, the output side of the second bidirectional DC transformer 322 Therefore, the first power supply unit 11 and the second power supply unit 12 whose input sides are independent of each other are connected through the output sides of the two to form a common output side.

The redundant power supply device 100 further includes the common capacitor 323 and a non-isolated DC conversion unit 324 connected in series with the common capacitor 323. The common capacitor 323 is connected between the first two-way DC transformer 312 and the second two-way DC transformer 322. In this embodiment, the common capacitor 323 is the common component 60 and is used to store the output power of the first power supply unit 11 and the second power supply unit 12. The input side of the common capacitor 323 is connected to the output sides of the two bidirectional DC transformers 312 and 322. The output side of the common capacitor 323 is connected to the input side of the non-isolated DC conversion unit 324, and the DC output voltage Vo output to the load 50 is adjusted through the non-isolated DC conversion unit 324. For example, as shown in FIG. 4B, the non-isolated DC conversion unit 324 is a step-down DC converter. The output side of the non-isolated DC conversion unit 324 is the output side of the redundant power supply device 100 to output the DC output voltage Vo to power the load 50.

The redundant power supply device 100 further includes a primary-side common control unit 325. The secondary-side common connection control unit 325 is coupled to the first bidirectional DC transformer 312, the second bidirectional DC transformer 322, and the non-isolated DC conversion unit 324. The secondary-side common control unit 325 controls the non-isolated DC conversion unit 324 to adjust the DC output voltage Vo. Moreover, the secondary-side common control unit 325 can control the first bidirectional DC transformer 312 and the corresponding two-way DC transformer 312 in a pulse width modulation (PWM) manner according to the received voltage, for example, the feedback voltage of the common output side. Second bidirectional DC transformer 322.

The two bidirectional DC transformers 312 and 322 provide a bidirectional DC conversion operation, receiving the voltages of the energy storage capacitors 31C, 32C on the AC side, providing isolation and rectification functions, and converting to DC voltage. Compared with the embodiments shown in FIG. 3A and FIG. 3B, the energy storage size of each of the energy storage capacitors 31C and 32C can be reduced through bidirectional energy sharing. Each of the step-up power factor correction units 311 and 321 also provides a voltage adjustment method of each of the energy storage capacitors 31C and 32C. Furthermore, the non-isolated DC conversion unit 324 can provide adjustment of the DC output voltage Vo.

Through completely isolated transformers, instead of mechanical or electrical switches, the isolation between different AC power sources AC1 and AC2 is realized to improve the operator's safety in installation and operation. The loss of energy required when one input power source is converted to another, or the normal expected interference reduction caused by the bidirectional DC transformers 312,322 and the storage capacitors 31C, 32C connected in parallel between the AC side and the DC side At this time, the common capacitor 323 is used to provide the energy storage required for the transition.

In the prior art, due to factors such as a transfer switch time and a failure to share a hold up capacitor or an energy storage capacitor, additional capacitors need to be installed. In this embodiment, the holding capacitance required for the AC to DC conversion process can be reduced, so the cost and size can be greatly reduced. In addition, the two bidirectional DC transformers 312, 322 use nearly ideal semiconductor components, so their conversion efficiency is the highest among all topological circuits. In addition, specific implementations are not limited to the voltage adjustment and switching timing of each of the bidirectional DC transformers 312 and 322.

In the following, the data is taken as an example to facilitate the description of the technology for creating the redundant power supply device 100 in the present invention. It is assumed that the rated output powers of the first power supply unit 11 and the second power supply unit 12 are 2000 watts respectively, and are used to provide the power required by the load 50. Furthermore, it is assumed that when the first AC power supply AC1 is normally powered, the secondary-side common connection control unit 325 of the redundant power supply device 100 controls the first received by the first power supply unit 11. The AC power AC1 is converted by the first power supply unit 11, and then output through the common output side, and finally via the common capacitor 323 and the non-isolated DC conversion unit 324 to provide the power required by the load 50.

At this time, the secondary-side common connection control unit 325 controls the second power supply unit 12 to the standby state, so that the second AC power supply AC2 received by the second power supply unit 12 cannot pass through the first The two power supply units 12 complete the power conversion, so they cannot be transmitted to the common output side. That is, the power required by the load 50 is completely provided by the first power supply unit 11.

Furthermore, if the first AC power source AC1 is abnormally powered (powered off), the second power supply unit 12 cooperatively joins and supplies power to the load 50. In this case, the secondary-side common connection control unit 325 controls the second AC power source AC2 received by the second power supply unit 12, is converted through the second power supply unit 12, and passes through the common connection. The output side is finally output through the common capacitor 323 and through the non-isolated DC conversion unit 324 to provide the power required by the load 50. At this time, the secondary-side common connection control unit 325 controls the first power supply unit 11 to a standby state, so that the first AC power supply AC1 received by the first power supply unit 11 cannot pass through the first A power supply unit 11 completes the power conversion, so it cannot be transmitted to the common output side. That is, the power required by the load 50 is completely provided by the second power supply unit 12.

In another embodiment, the redundant power supply device 100 can also be operated when the first AC power source AC1 and the second AC power source AC2 are both normal. Both the first power supply unit 11 and the second power supply unit 12 can provide an output with a rated output power of 0 to 100%. By performing power distribution on the first power supply unit 11 and the second power supply unit 12, the first power supply unit 11 and the second power supply unit 12 share the power required by the load 50.

Furthermore, when both the first AC power supply AC1 and the second AC power supply AC2 are normally powered, the OR'ing switch can be controlled to control the first power supply unit 11 or the second power supply unit 12 to independently The load 50 supplies power. In other words, when the first power supply unit 11 is used to supply power to the load 50, the second power supply unit 12 is in the standby state; otherwise, when the second power supply unit 12 is used to supply power to the load 50 The first power supply unit 11 is in the standby state.

For example, when the first power supply unit 11 is used to completely supply power to the load 50, the secondary-side common connection control unit 325 controls the semiconductor switch in the first bidirectional DC transformer 312 for a switching operation, and The secondary-side common control unit 325 controls a semiconductor switch in the second bidirectional DC transformer 322 to be in an off state. Conversely, when the second power supply unit 12 is used to completely supply power to the load 50, the secondary-side common control unit 325 controls the semiconductor switch in the second bidirectional DC transformer 322 for a switching operation, and this time The stage-side common control unit 325 controls the semiconductor switches in the first bidirectional DC transformer 312 to be in an off state.

In addition, the semiconductor switches in the first two-way DC transformer 312 and the second two-way DC transformer 322 can also be controlled for switching operation at the same time, so that the first power supply unit 11 and the second power supply unit 12 can jointly The load 50 supplies power.

As shown in FIGS. 5A and 5B, the first power supply unit 11 of the redundant power supply device 100 of the present invention is a first isolated power factor correction circuit 411. The second power supply unit 12 is a second isolated power factor correction circuit 421. In this embodiment, each of the isolated power factor correction circuits 411 and 421 is an isolated Ćuk converter. In addition, other forms of isolated power factor correction converters, such as flyback converters, can also be used for each of the isolated power factor correction circuits 411,421.

The first isolated power factor correction circuit 411 has an input side and an output side, wherein the input side forms the input side of the first power supply unit 11 to receive the first AC power supply AC1. The output side of the first isolated power factor correction circuit 411 forms the output side of the first power supply unit 11 to output the first DC power source.

The second isolated power factor correction circuit 421 has an input side and an output side, wherein the input side forms the input side of the second power supply unit 12 to receive the second AC power source AC2. The output side of the second isolated power factor correction circuit 421 forms the output side of the second power supply unit 12 to output the second DC power source.

Please refer to FIG. 1. The casing 10 is connected to the two AC power sources AC1 and AC2 through the two power connection terminals 21 and 22, so that the first AC power source AC1 and the second AC power source AC2 are respectively connected to the first The isolated power factor correction circuit 411 and the second isolated power factor correction circuit 421 feed power.

The output side of the first power supply unit 11, that is, the output side of the first isolated power factor correction circuit 411 is connected to the output side of the second power supply unit 12, that is, the second isolated power factor correction. The output side of the circuit 421, therefore, the input side is independent of each other. The first power supply unit 11 and the second power supply unit 12 are connected through their output sides to form a common output side.

The redundant power supply device 100 further includes a common capacitor 422 and a non-isolated DC conversion unit 423 connected in series with the common capacitor 422. The common capacitor 422 is connected to the first isolated power factor correction circuit 411 and the second isolated power factor correction circuit 421. In this embodiment, the common capacitor 423 is the common component 60 and is used to store the output power of the first power supply unit 11 and the second power supply unit 12. The input side of the common capacitor 422 is connected to the output sides of the two isolated power factor correction circuits 411, 421. The output side of the common capacitor 422 is connected to the input side of the non-isolated DC conversion unit 423, and the DC output voltage Vo output to the load 50 is adjusted through the non-isolated DC conversion unit 423. For example, as shown in FIG. 5B, the non-isolated DC conversion unit 423 is a step-down DC converter. The output side of the non-isolated DC conversion unit 423 is the output side of the redundant power supply device 100, and outputs a DC output voltage Vo to power the load 50.

The redundant power supply device 100 further includes a primary-side common control unit 424. The secondary-side common control unit 424 is coupled to the first isolated power factor correction circuit 411, the second isolated power factor correction circuit 421, and the non-isolated DC conversion unit 423. The secondary-side common connection control unit 424 controls the non-isolated DC conversion unit 423 to adjust the DC output voltage Vo. In addition, the secondary-side common control unit 424 may control the first isolated power factor correction circuit in a pulse width modulation (PWM) manner according to the received voltage, for example, the feedback voltage of the common output side. 411 and the second isolated power factor correction circuit 421.

Through completely isolated transformers, instead of mechanical or electrical switches, the isolation between different AC power sources AC1 and AC2 is realized to improve the operator's safety in installation and operation. The common capacitor 422 is used to provide the energy storage required for the transition when the energy required to switch from one input power source to another input power source is reduced or the interference is normally expected to be reduced.

In the prior art, due to factors such as a transfer switch time and a failure to share a hold up capacitor or an energy storage capacitor, additional capacitors need to be installed. In this embodiment, the holding capacitance required for the AC to DC conversion process can be reduced, so the cost and size can be greatly reduced.

In the following, the data is taken as an example to facilitate the description of the technology for creating the redundant power supply device 100 in the present invention. It is assumed that the rated output powers of the first power supply unit 11 and the second power supply unit 12 are 2000 watts respectively, and are used to provide the power required by the load 50. Furthermore, it is assumed that when the first AC power supply AC1 is normally powered, the connection control unit 424 of the redundant power supply device 100 can control the first AC received by the first power supply unit 11 according to the system. The power supply AC1 is output through the first power supply unit 11 through the common output side, and finally through the common capacitor 422 and through the non-isolated DC conversion unit 423 to provide the power required by the load 50.

At this time, the control unit controls the second power supply unit 12 to the standby state, so that the second AC power supply AC2 received by the second power supply unit 12 cannot be completed through the second power supply unit 12 The power is switched so it cannot be transmitted to this common output side. That is, the power required by the load 50 is completely provided by the first power supply unit 11.

Furthermore, if the first AC power source AC1 is abnormally powered (powered off), the second power supply unit 12 cooperatively joins and supplies power to the load 50. In this case, the control unit controls the second AC power supply AC2 received by the second power supply unit 12, and is converted by the second power supply unit 12 through the common output side and finally through the The capacitor 422 is connected in common and output through the non-isolated DC conversion unit 423 to provide the power required by the load 50. At this time, the secondary-side common connection control unit 424 controls the first power supply unit 11 to a standby state, so that the first AC power supply AC1 received by the first power supply unit 11 cannot pass through the first A power supply unit 11 completes the power conversion, so it cannot be transmitted to the common output side. That is, the power required by the load 50 is completely provided by the second power supply unit 12.

In another embodiment, the redundant power supply device 100 can also be operated when the first AC power source AC1 and the second AC power source AC2 are both normal. Both the first power supply unit 11 and the second power supply unit 12 can provide an output with a rated output power of 0 to 100%. By performing power distribution on the first power supply unit 11 and the second power supply unit 12, the first power supply unit 11 and the second power supply unit 12 share the power required by the load 50.

Furthermore, when both the first AC power supply AC1 and the second AC power supply AC2 are normally powered, the OR'ing switch can be controlled to control the first power supply unit 11 or the second power supply unit 12 to independently The load 50 supplies power. In other words, when the first power supply unit 11 is used to supply power to the load 50, the second power supply unit 12 is in the standby state; otherwise, when the second power supply unit 12 is used to supply power to the load 50 The first power supply unit 11 is in the standby state.

For example, when the first power supply unit 11 is used to completely power the load 50, the secondary-side common control unit 424 controls the semiconductor switch in the first isolated power factor correction circuit 411 to switch. The secondary side common connection control unit 424 controls the semiconductor switch in the second isolated power factor correction circuit 421 to be in an off state. Conversely, when the second power supply unit 12 is used to completely supply power to the load 50, the secondary-side common control unit 424 controls the semiconductor switch in the second isolated power factor correction circuit 421 for a switching operation. The secondary-side common control unit 424 controls the semiconductor switch in the first isolated power factor correction circuit 411 to be turned off.

In addition, the semiconductor switches in the first isolated power factor correction circuit 411 and the second isolated power factor correction circuit 421 can also be controlled for switching operation at the same time, so that the first power supply unit 11 and the second power supply The units 12 may collectively power the load 50.

In the foregoing embodiments of the present invention, the energy storage elements, such as a capacitive element or an inductive element, are used to provide an application for implementing a backup power source. Furthermore, this creation can further provide a common control topology, so that the switching elements of the secondary circuit can be controlled by the same common secondary controller.

However, the above are only detailed descriptions and drawings of the preferred specific embodiments of the creation, but the characteristics of the creation are not limited to this, and are not intended to limit the creation. The entire scope of the creation should be applied as follows The scope of patents shall prevail. All the embodiments that are in line with the spirit of the patent scope of this creation and similar changes shall be included in the scope of this creation. Anyone who is familiar with the art can easily think about it in the field of this creation. Variations or modifications can be covered by the patent scope of the following case.

100 Redundant power supply device 10 Chassis 11 First power supply unit 12 Second power supply unit 111 First step-up power factor correction unit 112 First isolated DC conversion unit 113 First isolated measurement and control unit 121 Second step-up power factor correction unit 122 Second isolated DC conversion unit 123 Second isolated measurement and control unit 124 Secondary-side common component 125 Secondary-side control unit 131 First step-up power factor correction Unit 132 First LLC DC converter 141 Second step-up power factor correction unit 142 Second LLC DC converter 143 Transformer V1 First capacitor voltage V2 Second capacitor voltage M1 Switch M2 Switch M3 Switch M4 Switch C1 Resonance capacitor C2 Resonance Capacitor C3 Capacitor C4 Capacitor L11 Inductor L12 Inductor L3 Inductor L4 Inductor 311 First step-up power factor correction unit 312 First bidirectional DC transformer 321 Second step-up power factor correction unit 322 Second bidirectional DC transformer 323 Common capacitor 324 Non-isolated DC conversion unit 325 Secondary side common control unit 31C Energy storage capacitor 32C Energy storage capacitor 411 First isolated power factor correction circuit 421 Second isolated power factor correction circuit 422 Common capacitor 423 Non-isolated DC conversion unit 424 Secondary side common connection Control unit 21 First power connection terminal 22 Second power connection terminal 30 DC output terminal 41 Cooling fan 42 Cooling fan 50 Load 51 Switching device 52 Power supply unit 60 Common connection component 61 First power supply 62 Second power supply 63 Power conversion Off 64 AC-to-DC converter 65 Switch controller 71 First AC power source 72 Second AC power source 73 Circuit switch module 74 Controllable AC-to-DC conversion module 75 Control module 81 First AC power source 82 Second AC power source 83 Automatic transfer switch 84 Power factor corrector 85 DC to DC converter 86 Micro control unit 91 First power source 92 Second power source 93 Bridge rectifier 94 Bridge rectifier 95 Silicon controlled rectifier 96 Silicon controlled rectifier AC1 First AC power AC2 Second AC power Vo DC output voltage

Figure 1: A three-dimensional appearance of the redundant power supply device for this creation. Figure 2: A block diagram of a redundant power supply device for this creation. FIG. 3A is a schematic circuit block diagram of a first embodiment of a redundant power supply device of the present invention. FIG. 3B is a circuit block diagram of a specific circuit of FIG. 3A. FIG. 3C is a circuit block diagram of another specific circuit of FIG. 3A. FIG. 4A is a schematic circuit block diagram of a second embodiment of the redundant power supply device of the present invention. FIG. 4B is a circuit block diagram of a specific circuit of FIG. 4A. FIG. 5A is a schematic circuit block diagram of a third embodiment of a redundant power supply device of the present invention. FIG. 5B is a circuit block diagram of a specific circuit of FIG. 5A. Figure 6: A block diagram of a conventional redundant power supply. FIG. 7 is a circuit block diagram of a conventional uninterruptible power supply. Figure 8: Circuit block diagram of a conventional power supply system. FIG. 9 is another circuit block diagram of a conventional power supply system. FIG. 10 is a circuit block diagram of a conventional uninterruptible power supply. FIG. 11 is a block diagram of a conventional redundant AC-to-DC power supply circuit.

Claims (8)

A redundant power supply device includes: at least two power supply terminals, each connected to an AC power source; at least two power supply units, each of the power supply units has an input side, and the at least two power supply units have a common output side, The input sides of the at least two power supply units are respectively connected to the at least two power connection terminals, and the corresponding AC power is converted into a direct current power respectively; and a common connection element is connected to the common output side to receive the DC power sources; The common connection element is an inductive element. The redundant power supply device according to claim 1, wherein the redundant power supply device has a transformer, and a secondary side core of the transformer and a secondary side winding wound around the secondary side core form the Commonly connected components. The redundant power supply device according to claim 2, wherein each of the power supply units includes a DC conversion unit, the DC conversion unit has an input side and an output side; the input side of the DC conversion unit is coupled to the A primary-side iron core of the transformer, and the output side of the DC conversion unit is coupled to the secondary-side iron core of the transformer. The redundant power supply device according to claim 3, wherein the DC conversion unit is an inductance-inductance-capacitance (LLC) conversion unit, a step-down conversion unit or a step-up conversion unit. The redundant power supply device according to claim 3 or 4, wherein each of the power conversion units further includes a power factor correction circuit, and the power factor correction circuit is connected to the input side of the DC conversion unit. The redundant power supply device according to claim 1, further comprising at least two control units, each of which controls the power supply unit correspondingly. The redundant power supply device according to claim 6, further comprising a main control unit, and the main control unit controls the at least two control units respectively. The redundant power supply device according to claim 1, wherein the at least two power connection terminals, the at least two power supply units, and the common connection component are modularized in a casing.