Protection circuit in power supply capable of selecting individual overload or group overload

Protection circuit for selecting independent overload or group overload in power supply

The creation involves a power supply for a plurality of loads requiring a large power output, and can independently activate an independent or group overload protection circuit to facilitate the user to select an appropriate power output according to the load capacity requirement.

Due to the rapid advancement of technology and the relative improvement of electronic technology, as computer systems become more and more powerful, with the increasing functions of central processing units (CPUs) and graphics cards, and other additional functions, the components of the computer infrastructure are also functioning. It is necessary to match the enhancements, so that the whole system can be used more efficiently, just as the usage specifications of the central processing unit have entered the dual-core architecture from a single core, and the graphics card part, the higher-order players have a clearer and more diverse image quality, and Better 3D effect, two or more graphics cards will be used in the system at the same time, and the current high-end graphics card needs to be allocated 150 watts of power, which is equivalent to one computer system light drawing card. With 300~450 watts of power, the past 300 watts, 350 watts of power supply is simply not enough, plus the increase in the number of other hard disk drives, CD players and USB connectors, each requiring a lower supply voltage. And higher power wattage, in order to make the entire system to use the best efficiency, the power supply design is also more toward high power.

Since the power supply is designed, it is necessary to pay attention to the safety considerations of high power. Therefore, in the SSI and UL specifications, the dangerous reference value is specified for the maximum output power of a single load. For example, the specification of SSI1 is 240 volts. Ann (VA), that is, when the output voltage is 12 volts (V), the current limit is 20 amps (A), which protects the safety of general computer users; however, when professionals use the system, they tend to If you connect more peripheral devices, there will be more power demand, and the power supply manufacturer needs to design and develop a high-power power supply system separately for the professionals. Therefore, in terms of developers, additional designs must be added. Development costs, and at the same time, because of the supply of different specifications of the power supply, the cost of manufacturing and selling inventory in the product will also increase.

In response to the above-mentioned shortcomings, someone has proposed a power supply that can choose to increase the output power, which is to increase the output power of a specific array of power supplies. For example, the output current of the original single-group load is 20A, which sets a selection circuit. It can be used by the user to increase the output load to 30A or higher. However, this method allows the output power of the load to be increased, but when the output power of a load is higher than the maximum output power allowed at the beginning. When, for example, more than 30A, and the current demand of other loads is lower than 20A, although the total output power of the two groups is less than 50A, the protection circuit is triggered, which causes power failure, and thus is very inconvenient in use.

The creators of this creation, in view of the difficulties in the implementation of the conventional power supply, are aiming at the crux of the problem and start to seek improvement and make up for their shortcomings in order to seek a reasonable solution. After countless researches. Analysis, design, and finally complete the protection circuit of the power supply of this creation to select independent or group overload.

One of the purposes of this creation is to provide a circuit for a plurality of large power outputs, which allows the user to select whether to activate the group overload protection circuit according to the power demand of the load.

The second objective of this creation is to provide a way for developers to re-develop power protection circuits when designing power supplies without the need for certain independent loads.

A further object of the present invention is to provide an output power demand for an independent load when the user switches the group circuit, but when the total output power of all loads under the group circuit does not reach the dangerous reference value, Allow the power supply to work properly without cutting off the power output.

First, please refer to FIG. 1 , which is a circuit diagram of a protection circuit for selecting an independent overload or a group overload in the power supply of the present invention. The power supply is provided with a power conversion circuit 10 and a switching circuit 20 . The plurality of independent circuits 30 and a group of circuits 40; wherein the power conversion circuit 10 converts the external power source into a plurality of different voltage outputs (in this embodiment, the external AC power source 110 volts or 220 volts is converted to DC ± 3.3 volts, ±5 volts or ±12 volts), and the power conversion circuit 10 is provided with a system output power supply 11 (providing an array of large voltages of ±12 volts DC and a small voltage of ±3.3, ±5 volts) and a A system protection circuit 12 that defines an output power hazard reference for the power supply in accordance with SSI or UL specifications and when the output power of the power supply exceeds a dangerous reference value (Over Load), will be powered off or issued a warning signal with a preset processing procedure (the protection circuit described in this embodiment is a conventional technology, the creation is not limited to any equivalent circuit implementation, so no further description here The circuit is operated; a switching circuit 20 (in this embodiment, the user can start manually or in an integrated circuit or other equivalent circuit), and the switching circuit 20 is connected to the system output power 11 and is available for the user to select and drive. a plurality of independent circuits 30 or a group of circuits 40; a plurality of independent circuits 30 (described in the present embodiment by three independent circuits), wherein the independent circuits 30 are provided with a plurality of independent output power sources 31 and independent outputs The power source 31 is a one-to-one correspondence independent overload protection circuit 32. The independent output power source 31 is connected to each load 50 in a one-to-one correspondence. A group circuit 40 has a group output in the group circuit 40. The power supply 41 and a group of overload protection circuits 42 are further connected to the respective loads 50, and the dangerous reference value of the group overload protection circuit 42 is not greater than each independent overload protection circuit. The total output power.

In addition, the voltage output of the independent circuit 30 and the group circuit 40 described in the present application is exemplified by 12 volts.

When used, it is separately stated according to SSL or UL for the dangerous reference value of the single load output (that is, the voltage for the single load output is 12 volts, and the current is not more than 20 amps).

The first state is that when the total power used by the user is not greater than the output value of the system output power 11 output, the user selects the output power of the single load 50 to be no more than 20 amps, so when connected to the independent circuit 30 If the output power of any of the loads 50 is greater than 20 amps, the independent overload protection circuit 32 will be activated and a power down or warning signal will be issued.

The second state is such that when the total power used by the user is not greater than the output of the dangerous reference value by the system protection circuit 12, when the user selects the group circuit 40, the output of any load 50 connected to the group circuit 40 is Although the power is greater than 20 amps, but the total output power of the group circuit 40 is not greater than 20 amps * 3 = 60 amps at this time, the group overload protection circuit 42 will not be activated, but keep the power supply operating normally; When the output power of the group circuit 40 is greater than 20 amps * 3 = 60 amps, the group overload protection circuit 42 is activated and a power down or warning signal is issued. .

The third state: when the user selects the independent circuit 30 or the group circuit 40, although the dangerous reference value is not exceeded, but when connected to the power supply total load (including the connection voltage of 12 volts and 3.3 volts and 5 volts) When the power output is greater than the system protection circuit 12, the system protection circuit 12 is activated and a power down or warning signal is issued.

In summary, the power supply of the present invention selects a protection circuit of independent overload or group overload, and the overall structure is simple and reliable, and can be used on any kind of electronic product, which is very convenient in use and can improve utility, completely In line with the new patent requirements, the special patent is filed according to law.

<p>Power conversion circuit. . . 10</p><p>System output power. . . 11</p><p>System protection circuit. . . 12</p><p>Switching circuit. . . 20</p><p>Independent circuit. . . 30</p><p>Independent output power supply. . . 31</p><p>Independent overload protection circuit. . . 32</p><p>Group circuit. . . 40</p><p>Group output power. . . 41</p><p>Group overload protection circuit. . . 42</p><p>load. . . 50</p>

The first picture is a schematic diagram of the circuit of the creation.