CN1171371C - Power supply system with alternating current standby function and alternating current power supply reverse insertion protection function - Google Patents

Abstract

The invention relates to a power supply system with AC backup and AC power supply electric property reverse plugging protection function, which provides at least two groups of AC input power supplies, a parallel power supply system composed of 2N +1 groups of DC power supply modules, a switching circuit which is used for automatically switching to another normal AC input power supply when one AC input power supply is abnormal, and a protection circuit which is arranged on the switching circuit and can protect the AC power supply electric property reverse plugging to avoid the damage of the switching circuit, thereby obtaining a more stable power supply system.

Description

Power supply system with AC backup and protection against AC power reverse plugging

technical field

The present invention relates to a power supply system, in particular to a system comprising at least two sets of AC input power supplies, 2N+1 sets (where N is a positive integer) of DC power supply modules, and a switching circuit, used as an AC input power supply In case of abnormality, it can automatically switch to another normal AC power input; and a protection circuit is installed in the switching circuit, which can protect the AC power from being electrically reversed, so as to avoid damage to the circuit components of the switching circuit. A power supply system that protects the AC power plug reverse function.

Background technique

As shown in FIG. 1 , the existing power supply system with a DC standby (DC Redundant) function provides multiple sets of DC power modules 12 parallel outputs for a single AC power input 11, and when a single DC power module is damaged, It will not cause power output interruption, because the backup function formed by other DC power supply modules is sufficient to maintain normal power output; If the socket on the UPS is disconnected, the entire power supply system will be interrupted, causing the computer workstation or server center to stop.

To avoid the interruption of power supply caused by the above-mentioned accidents, the ideal power supply system should not only have the DC backup function in the prior art, but also provide a similar backup function for the AC input terminal, that is, when a group of AC input power supply is cut off unexpectedly At this time, the power supply system can also continue to supply power through other AC input power sources, its embodiment is shown in Figure 2, the power supply system has two sets of AC power input, that is, the first AC power input 21 and the second AC power input 22, Wherein the AC power input 21 and the second AC power input 22 are not only electrically connected to the first DC power supply module 24 and the second DC power supply module 25, but also electrically connected to two pairs of switching circuits 23. A switched relay, that is, a first relay 231 and a second relay 232 ; and the relay is electrically connected to the third DC power supply module 26 after passing through a group of third relays 233 switched two-to-one. Shown in Figure 2 is the situation during normal operation, the third DC power supply module 26 participates in the parallel output of the first DC power supply module 24 and the second DC power supply module 25, and provides power higher than the load consumption, which requires The AC power comes from the first AC power input 21 , so the first relay 231 is turned on, and the third relay 233 is turned on at one end connecting the third DC current supply module 26 and the first relay 231 .

Figure 3 shows the situation where the first AC power input 31 is interrupted, which causes the first DC power supply module 34 to be interrupted. At this time, the second AC power input 32 must play an AC backup function to avoid the first DC power supply module. 34 and the second DC power supply module 36 shut down at the same time, so the switching circuit 33 starts to act: first, the second relay 332 will be turned on because the AC power supply 31 disappears, and the first relay 331 will be disconnected because the AC power supply 31 disappears; Next, turn on one end of the third relay 333 connected to the third DC power supply module 36 and the second relay 332 , so that the second DC power supply module 36 can be electrically connected to the second AC power input 32 to continue supplying power.

The above method basically takes into account both the DC and AC backup functions of the power supply system, and can provide a stable and reliable power source. However, there are safety blind spots in practical applications. The existing 110V power sockets are divided into two specifications: two holes and three holes, and the design has a fool-proof effect, that is, the power plug can only be inserted into the power socket in a specific direction, the purpose is to let the power plug get fixed from the socket However, there are always some situations where the power plug can be inserted into the power socket in any direction. The live wire of the relay 333 is adjacent to the ground wire contact, which causes damage to the AC power supply due to a short circuit when the AC power input is switched.

Contents of the invention

In order to avoid the occurrence of the above situation, the purpose of the present invention is to provide a power supply system with AC backup and protection function for reverse insertion of the AC power supply, so that in the power supply system with the function of AC backup, a device for avoiding reverse insertion of the AC power supply is provided. The protection circuit can prevent the live wire of the third relay 333 from being adjacent to the ground wire contact, so as not to cause a short circuit of the AC power supply during switching.

In order to achieve the above-mentioned purpose, the present invention provides a power supply system with AC backup and protection function for AC power reverse plugging, which includes: at least two sets of AC input power supplies; at least three sets of DC power supply modules, the DC power supply Two groups of the supply modules are respectively electrically connected to the AC input power supply, and the other DC power supply modules are used as a backup DC power supply module; a switching circuit is electrically connected to the AC input power supply and the backup DC power supply The module includes at least two sets of one-to-one switching relays, a protection circuit and a set of at least two-to-one switching relays, and one end of the one-to-one switching relays is electrically connected to the AC input power supply , used to control the conduction or non-conduction of individual AC input power paths, the other ends of which are respectively electrically connected to the input end of a protection circuit, and one end of the two-to-one switching relay is respectively electrically connected to the protection circuit. The output end of the circuit is electrically connected to the backup DC power supply module, and the switching circuit can automatically switch to another normal AC power input when an AC input power supply is abnormal; a protection circuit is set In the switching circuit, it has at least two full-wave rectifiers connected in parallel, their input ends are respectively electrically connected to the other end of the one-to-one switching relay, and their output ends are electrically connected to the set of at least one It is one end of a two-to-one switching relay, and the protection circuit is used to protect an AC power plug-in reverse to avoid damage to the switching circuit.

Wherein the AC input power source is a different AC power source.

Wherein the DC power supply module is powered by a parallel output.

Wherein the backup DC power supply module has an output power supply when the AC input power supply is normal.

Wherein the switching circuit is to simultaneously switch the live wire and the ground wire input by the AC power supply.

Wherein the switching movement of the switching circuit is performed when the AC power input by the normal AC power source alternates to a zero crossing point.

Compared with the prior art, the present invention has obvious advantages and positive effects. From the above technical solutions, it can be seen that the power supply system of the present invention has the function of AC standby and can protect the AC power supply from being plugged in reversely. In practical application, not only the function of the power supply system is complete and stable, but also the overall system is taken into consideration. Safety must meet the requirements of safety regulations to provide users with a reliable, stable and safe power system.

Description of drawings

Figure 1 shows the existing power supply system.

Figure 2 is a power supply system with AC backup function.

FIG. 3 is a circuit block diagram of a comparative embodiment of the power supply system with AC backup of the present invention.

FIG. 4 is a circuit structure diagram of an embodiment of the power supply system with AC backup with the function of protecting the AC power input from reverse plugging according to the present invention.

The main components in the figure are numbered as follows:

11: AC power input

12: DC power supply module

21: The first AC power input

22: Second AC power input

23: Switching circuit

231: First Relay

232: Second relay

233: The third relay

24: The first DC power supply module

25: Second DC power supply module

26: The third DC power supply module

31: The first AC power input

32: Second AC power input

33: switch circuit

331: First Relay

332: second relay

333: The third relay

34: The first DC power supply module

35: Second DC power supply module

36: The third DC power supply module

41: The first AC power input

42: Second AC power input

43: switch circuit

431: First Relay

432: second relay

433: The third relay

434: Protection circuit

4341: First full-wave rectifier

4342. Second full wave rectifier

44: The first DC power supply module

45: Second DC power supply module

46: The third DC power supply module

47: Controller

Detailed ways

The specific structure, features and functions of the power supply system with AC backup and protection against AC power plug-in reverse function according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

Please refer to FIG. 4 , which shows an embodiment of the power supply system of the present invention with the AC backup function and the function of protecting the AC power from reverse insertion. In the embodiment of FIG. 4 , if the AC power input 41 is interrupted, the power supply of the first DC power supply module 44 will be interrupted. At this time, the second AC power input 42 must play an AC standby function to prevent the DC power supply module 44 and the second DC power supply module 46 from shutting down at the same time, so the switching circuit 43 starts to operate: first, the second relay 432 will be activated by the AC power supply. 41 disappears and is turned on, and at the same time, the first relay 431 is turned off due to the disappearance of the AC power supply 31 . Next, turn on one end of the third relay 433 connected to the third DC power supply module 46 and the second relay 432 , so that the second DC power supply module 46 can be electrically connected to the second AC power input 42 to continue supplying power.

In addition to two sets of one-to-one switching relays (the first relay 431 and the second relay 432), and a set of two-to-one switching relays, the power supply system of the present invention has the function of AC standby and can protect the AC power supply from reverse insertion. (the third relay 433), a protection circuit 434 is also provided, wherein the first AC power input 41 is electrically connected to the first full-wave rectifier 4341 of the protection circuit 434 through the first relay 431 after rectification, and then electrically connected to the third A group of terminals of the relay 433; and the second AC power input 42 is electrically connected to the second full-wave rectifier 4342 of the protection circuit 434 through the second relay 432 for rectification, and then electrically connected to another group of terminals of the third relay 433. Since the AC power input is electrically connected to the terminals of the third relay 433 after full-wave rectification, no matter how the live wire and the ground wire of the AC power input change, as long as the two sets of input terminals of the third relay 433 are arranged properly, The polarity of the power supply at the adjacent terminals does not appear to be adjacent to the positive and negative power supplies, so that the accidental occurrence of the previous AC power short circuit can be avoided.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

Claims (6)

1. the power system of the electrical anti-inserted function of tool stand-by AC and tool protection AC power is characterized in that it comprises:

At least two group alternating current input power supplyings;

At least three group direct current power supply modules, described direct current power supply module wherein two groups be electrically connected to described alternating current input power supplying respectively, and all the other direct current power supply modules are as a standby direct current power supply module;

One switches circuit, be electrically connected on described alternating current input power supplying and described standby direct current power supply module this, it comprises two groups of relays that switch one to one at least, one protective circuit and one group of relay that are at least two pairs one switchings, one end of the described relay that switches one to one is electrically connected to described alternating current input power supplying respectively, in order to the conducting of controlling indivedual alternating current input power supplyings path whether, its other end then is the input that is electrically connected to a protective circuit respectively, and an end of described two pairs one relays that switch is electrically connected to the output of the art guest of institute protective circuit respectively, the other end then is electrically connected to described standby direct current power supply module, and described commutation circuit can automatically switch to another normal AC power input when an alternating current input power supplying is unusual;

One protective circuit; it is located in this commutation circuit; it has at least two full-wave rectifiers; be connected in parallel; its input is electrically connected on the other end of the described relay that switches one to one respectively; its output is electrically connected on described one group of end that is at least two pairs one relays that switch, and this protective circuit is in order to protect an AC power electrically anti-inserted and avoid the damage of this commutation circuit.

2. the power system of tool stand-by AC according to claim 1 and the electrical anti-inserted function of tool protection AC power is characterized in that described alternating current input power supplying is different AC power source.

3. the power system of tool stand-by AC according to claim 1 and the electrical anti-inserted function of tool protection AC power is characterized in that described DC power supplier is to adopt output power supply in parallel.

4. the power system of tool stand-by AC according to claim 1 and the electrical anti-inserted function of tool protection AC power is characterized in that described standby DC power supplier is all just often at this alternating current input power supplying, is that the output power supply is arranged.

5. the power system of tool stand-by AC according to claim 1 and the electrical anti-inserted function of tool protection AC power is characterized in that described commutation circuit is live wire and the ground wire that switches this AC power input simultaneously.

6. the power system of the electrical anti-inserted function of tool stand-by AC according to claim 1 and tool protection AC power, the motion switch that it is characterized in that described commutation circuit are that AC power alternation in this normal AC power input just carries out during to zero crossover point.

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