TWI410785B - Power supply circuit and system - Google Patents

Abstract

A power supply circuit and system are disclosed. The system comprises a rectifier, a direct current power source, a boost power factor corrector (PFC), a converter and a load. The rectifier is electrically connected to an alternating current power source. The direct current power source is connected to a switch element in series. The direct current power source and the switch element are connected between the boost power factor corrector and the converter. The converter is electrically connected to the boost PFC. The load is electrically connected to the converter.

Description

Power supply circuit and system

This invention relates to a power supply circuit and system, and more particularly to a power supply circuit and system having a boost power factor correction circuit.

With the rapid development of industry and the increasing demand for energy, people pay more and more attention to the quality and efficiency of power supply. Taking Uninterruptable Power Supply (UPS) as an example, computers have been widely used in people's livelihood and industrial applications in recent years. Therefore, the preservation of data and the normal operation of computer equipment are often valued by users. However, when using a computer, if an unexpected power interruption occurs, causing the computer to crash and jeopardizing the preservation of important data, the UPS can provide an emergency power to the computer to maintain the normal operation of the computer.

Please refer to FIG. 1 and FIG. 2, which are schematic circuit diagrams of a conventional power supply system. When the conventional power supply system 910 can be used as an uninterruptible power system or a communication power supply system, the input end of the power supply system 910 is connected to the mains power supply (AC 95V~230V), and the output end is connected to a load ( Not shown, and the power supply system 910 includes a full-wave rectifier 911, a power factor correction circuit 912, a DC power source 913, and a converter 914. The full-wave rectifier 911 is connected to the mains to perform full-wave rectification of the AC mains. The power factor correction circuit 912 is connected to the full-wave rectifier 911 for enabling the input current waveform to follow the input voltage waveform to achieve power factor correction and voltage stabilization. The DC power supply 913 is connected between the power correction circuit 912 and the converter 914 for providing DC power to the converter 914 when the utility power cannot be normally supplied, and is converted into an output power by the converter 914 (another DC Power or AC power). When the DC power supply 913 supplies power and the load needs to be driven by a higher voltage level, the general DC power supply 913 needs to stack a plurality of high voltage batteries (as shown in FIG. 1); or the DC power supply 913 needs to be continuously flowed. A direct current (DC/DC) converter 915 converts a low voltage level to a high voltage level (as shown in FIG. 2). However, high voltage battery packs stacked by high voltage batteries are relatively expensive, thereby increasing the cost of the power supply system. If the converter 915 is used to boost the voltage, the loss of partial efficiency in the converter 915 cannot be avoided, and the cost and complexity of the system are also increased.

Therefore, an aspect of the present invention is to provide a power supply system and circuit for boosting by using a boost power factor correction circuit, thereby using a low voltage DC power source to provide a high voltage DC power without adding a converter. Boost.

According to an embodiment of the present invention, the power supply system of the present invention includes at least a rectifier circuit, at least a DC power source, a boost power factor correction circuit, a converter, and a load. The rectifier circuit is electrically connected to an AC power source, and the DC power source is connected in series with the switching component to provide DC power. The boosting power correction circuit is used to correct the power factor and increase the voltage level of the direct current. The DC power source and the switching element are electrically connected between the rectifier circuit and the boosting power factor correcting circuit, and the converter is electrically connected. The boosting power factor correction circuit is configured to convert the direct current into an output power source, and the load is electrically connected to the converter to receive the output power.

Therefore, the power supply circuit and system of the present invention can use a low voltage DC power source to provide high voltage DC power, thereby reducing the cost and complexity of the power supply system and reducing unnecessary efficiency.

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. It is to be understood that the embodiments are not intended to limit the invention.

Please refer to FIG. 3 and FIG. 4, FIG. 3 is a system block diagram of a power supply system according to a first embodiment of the present invention, and FIG. 4 is a power supply according to a first embodiment of the present invention. Schematic diagram of the system. The power supply system of the embodiment includes at least a power supply circuit 100, an AC power supply 200, and a load (not shown). The input end of the power supply circuit 100 is electrically connected to the AC power supply 200 (mains AC 95V~230V). The output of the power supply circuit 100 is electrically connected to the load, and the load can be, for example, a computer device, a communication device, or other electronic device. When the AC power supply 200 is unable to supply power (power off), the power supply system can provide standby DC power. Therefore, the power supply system of this embodiment can be used as an uninterruptable power supply (UPS) or communication equipment power supply. system. It should be noted that in this embodiment, the AC power source 200 can be a single-phase AC power source, and in another embodiment, the AC power source 200 can also be a three-phase AC power source.

As shown in FIGS. 3 and 4, the power supply circuit 100 of the present embodiment includes at least a rectifier circuit 110, at least a DC power source 120, a switching element 130, a boost power factor correction circuit 140 (Boost PFC), and a converter. 150 (Converter). The input end of the rectifier circuit 110 is connected to the AC power source 200 for converting an alternating current provided by the AC power source 200 into a continuous current. The rectifier circuit 110 is, for example, a full-wave rectifier circuit (a diode bridge rectifier circuit) or a half-wave rectifier circuit. . The DC power source 120 is connected in series to the switching element 130, and the DC power source 120 and the switching element 130 are connected in parallel to the output end of the rectifier circuit 110, so that the switching element 130 can be switched to the DC power source 120 when the AC power source 200 fails to supply power normally. Another DC power is supplied to the load to prevent the power supply system from being able to supply power normally. The DC power source 120 of this embodiment may be a low voltage battery, and preferably has a large battery capacity (Ah), such as a solar cell, a fuel cell or a conventional battery, or may be a stack of a plurality of cells. The battery pack, or a battery consisting of a plurality of battery assemblies. A switching element 130 (eg, a relay) is coupled between the rectifier circuit 110 and the DC power source 120 to control the off or conducting state of the electrical path. When the AC power source 200 is normally powered, the switching element 130 is in an off state, and when the AC power source 200 is powered off, the switching element 130 is in an on state, and the DC power source 120 provides DC power.

As shown in FIG. 4, the boosting power factor correction circuit 140 of the present embodiment is connected in parallel to the DC power source 120 and the switching element 130, that is, the DC power source 120 and the switching element 130 are connected to the rectifier circuit 110 and the boosting factor. Correction between circuits 140. The boosting power factor correction circuit 140 is configured to cause the input current waveform to follow the input voltage, that is, to correct the power factor of the power supply system to improve the power supply efficiency, and to provide the DC power source 120 when the DC power source 120 provides DC power. The voltage level of the DC power to meet the load's demand for high voltage. In the present embodiment, the boosting power factor correction circuit 140 may include a power factor correction inductor 141, a switch 142, a diode 143, and a power factor correction capacitor 144. The switch 142 is composed of, for example, a power switch and a freewheeling diode, and is connected in parallel to the power factor correction inductor 141, thereby controlling the input current to track the waveform of the input voltage by using the on and off of the switch 142. The diode 143 is electrically connected to the output end of the power factor correction inductor 141, and the power correction capacitor 144 is electrically connected to the power factor correction inductor 141 and the diode 143 to store or release the output of the power factor correction inductor 141. The electric energy, the function correction capacitor 144 is preferably a bulk capacitor (Bulky Capacitor). At this time, since the DC power source 120 is connected to the input end of the boosting power factor correction circuit 140, when the DC power source 120 of the low voltage level provides DC power, the DC power can be boosted by the boosting power factor correction circuit 140. Voltage level to get a high level of voltage.

As shown in FIG. 3 and FIG. 4, the converter 150 of this embodiment may be a DC/AC or DC/DC converter and is connected to the output of the boosting power factor correction circuit 140 to receive the boosting power. The DC output from the circuit 140 is corrected and converted into a suitable output power source (alternating current or direct current) to the load.

Therefore, when the AC power supply 200 is normally powered, the boosting power factor correction circuit 140 of the present embodiment can increase the power factor of the power supply system, thereby improving the power supply efficiency. When the AC power supply 200 is unable to supply power normally, the DC power can be supplied by the DC power supply 120, and the voltage level of the DC power is raised by the boost power correction circuit 140 to meet the requirements of the load for high voltage driving. Therefore, the power supply circuit and system of the present embodiment can use the low voltage DC power source 120 to provide high voltage DC power, thereby reducing the cost and complexity of the power supply system and reducing unnecessary efficiency.

It should be noted that the power supply circuit of the present embodiment is only one embodiment of the present invention, and those skilled in the art of electronic circuits can achieve the same effect by various electronic circuit designs.

Please refer to FIG. 5, which is a circuit diagram of a power supply system according to a second embodiment of the present invention. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. Compared with the first embodiment, the power supply circuit 100a of the second embodiment further has at least one battery 160 and a diode 170. The battery 160 is connected in series to the diode 170, and the battery 160 and the diode 170 are connected in parallel. Between the boost power factor correction circuit 140 and the converter 150. The battery 160 is preferably a small battery capacity (Ah) high voltage battery for temporarily supplying DC power to the converter 150 before the power factor correction capacitor 144 has not been discharged to further ensure power supply stability of the power supply circuit 100a. It should be noted that in this embodiment, a large capacitor (not shown) may be used instead of the battery 160 to stabilize the power supply of the power supply circuit 100a.

It can be seen from the above embodiments of the present invention that the power supply circuit and system of the present invention can use a low voltage DC power supply to provide high voltage DC power without increasing the converter for boosting, thereby reducing the cost of the power supply system and Complexity and reduced unnecessary efficiency.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100, 100a. . . Power supply circuit

110. . . Rectifier circuit

120. . . DC power supply

130. . . Switching element

140. . . Boost power correction circuit

141. . . Correction inductance

142. . . switch

143. . . Dipole

144. . . Correction capacitor

150. . . converter

160. . . battery

170. . . Dipole

200. . . AC power

910. . . Power supply system

911. . . Full wave rectifier

912. . . Power factor correction circuit

913. . . DC power supply

914. . . converter

915. . . DC/DC converter

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

Figure 3 is a block diagram showing the system of a power supply system in accordance with a first embodiment of the present invention.

Figure 4 is a circuit diagram showing a power supply system in accordance with a first embodiment of the present invention.

Figure 5 is a circuit diagram showing a power supply system in accordance with a second embodiment of the present invention.

100. . . Power supply circuit

110. . . Rectifier circuit

120. . . DC power supply

130. . . Switching element

140. . . Boost power correction circuit

150. . . converter

200. . . AC power

Claims (36)

A power supply system includes at least: a rectifying circuit electrically connected to an alternating current power source; at least a continuous power source, a switching element connected in series for providing continuous current, and a boosting power correcting circuit for correcting the power factor And increasing the voltage level of the DC power, wherein the DC power source and the switching component are electrically connected between the rectifier circuit and the boosting power factor correcting circuit; and a converter electrically connected to the boosting power factor a correction circuit for converting the DC power into an output power source; and a load electrically connected to the converter to receive the output power source. The power supply system of claim 1, wherein the load is a computer device or a communication device. The power supply system of claim 1, wherein the power supply system is an Uninterruptable Power Supply (UPS). The power supply system of claim 1, wherein the power supply system is a communication device power supply system. The power supply system of claim 1, wherein the rectifier circuit is a full-wave rectifier circuit. The power supply system of claim 5, wherein the rectifier circuit is a diode bridge rectifier circuit. The power supply system of claim 1, wherein the rectifier circuit is a half-wave rectifier circuit. The power supply system of claim 1, wherein the direct current power source is a low voltage battery. The power supply system of claim 1, wherein the direct current power source is a solar battery, a fuel battery or a conventional battery. The power supply system of claim 1, wherein the DC power source is a battery pack stacked by a plurality of batteries. The power supply system of claim 1, wherein the switching element is a relay. The power supply system of claim 1, wherein the boosting power correction circuit comprises at least: a power factor correction inductor; a switch connected in parallel to the power factor correction inductor; a diode, electrical Connected to the output of the power factor correction inductor; A function is due to the correction capacitor, which is electrically connected to the power factor correction inductor and the diode. The power supply system of claim 12, wherein the open relationship consists of a power switch and a freewheeling diode. The power supply system of claim 12, wherein the power factor correction capacitor is a bulk capacitor (Bulky Capacitor). The power supply system of claim 1, wherein the converter is a DC/AC or DC/DC converter. The power supply system of claim 1, further comprising: at least one battery connected in series to a diode, wherein the battery and the two-pole system are connected in parallel to the boosting power correction circuit and the Converter, and the battery has a small battery capacity (Ah) and a high voltage. The power supply system of claim 1, wherein the AC power source is a single-phase AC power source. The power supply system of claim 1, wherein the AC power source is a three-phase AC power source. A power supply circuit in which an input of the power supply circuit The end is connected to an AC power source, and the output end of the power supply circuit is connected to a load. The power supply circuit includes at least: a rectifying circuit electrically connected to the AC power source; and at least a continuous power source for providing continuous current And electrically connecting a switching component in series; a boosting power correction circuit for correcting the power factor and raising the voltage level of the direct current, wherein the DC power source and the switching component are electrically connected to the rectifier circuit and The boosting power is between the correcting circuits; and a converter is electrically connected to the boosting power factor correcting circuit for converting the direct current into an output power supply and providing the output power to the load. The power supply circuit of claim 19, wherein the load is a computer device or a communication device. The power supply circuit of claim 19, wherein the power supply circuit is an Uninterruptable Power Supply (UPS). The power supply circuit of claim 19, wherein the power supply circuit is a communication device power supply system. The power supply circuit of claim 19, wherein the rectifier circuit is a full-wave rectifier circuit. A power supply circuit as described in claim 23, The rectifier circuit is a diode bridge rectifier circuit. The power supply circuit of claim 19, wherein the rectifier circuit is a half-wave rectifier circuit. The power supply circuit of claim 19, wherein the direct current power source is a low voltage battery. The power supply circuit of claim 19, wherein the direct current power source is a solar cell, a fuel cell or a conventional battery. The power supply circuit of claim 19, wherein the DC power source is a battery pack stacked by a plurality of batteries. The power supply circuit of claim 19, wherein the switching element is a relay. The power supply circuit of claim 19, wherein the boosting power correction circuit comprises at least: a power factor correction inductor; a switch connected in parallel to the power factor correction inductor; a diode, electrical An output terminal connected to the power factor correction inductor; and a power factor correction capacitor electrically connected to the power factor correction inductor and the diode. The power supply circuit of claim 30, wherein the open relationship consists of a power switch and a freewheeling diode. The power supply circuit of claim 30, wherein the power factor correction capacitor is a bulk capacitor (Bulky Capacitor). The power supply circuit of claim 19, wherein the converter is a DC/AC or DC/DC converter. The power supply circuit of claim 19, further comprising: at least one battery connected in series to a diode, wherein the battery and the two-pole system are connected in parallel to the boosting power correction circuit and the Converter, and the battery has a small battery capacity (Ah) and a high voltage. The power supply circuit of claim 19, wherein the AC power source is a single-phase AC power source. The power supply circuit of claim 19, wherein the AC power source is a three-phase AC power source.