An alternating current and direct current dual power hybrid cutting device and a hybrid cutting method

Abstract

The present application relates to a kind of AC-DC dual power supply hybrid cutting device and method, AC and DC power supply are provided at power input side, energy consumption module is provided at output load side, AC and DC power supply are connected energy consumption module by AC power supply line and DC power supply line respectively, AC and DC side power supply switch are respectively connected on two power supply lines;In AC side power supply line, the front and rear ends of AC side power supply switch are respectively provided with an external connection point, two external connection points are connected with three parallel connection branch lines, first all-controlled power electronic component, absorption capacitor C1 and first voltage clamping type protection device are respectively connected in series on three branch lines;In DC side power supply line, the front and rear ends of DC side power supply switch are respectively provided with an external connection point, two external connection points are connected with three parallel connection branch lines, second all-controlled power electronic component, absorption capacitor C2 and second voltage clamping type protection device are respectively connected in series on three branch lines.The device has the characteristics of fast, high fire-fighting.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power supply mixed cutting conversion, and particularly relates to a kind of AC-DC dual power supply mixed cutting device and mixed cutting method. BACKGROUND

[0002] A large number of computers and storage devices in data center will lead to data loss once power off, so the power supply requirement is very high, generally with at least 2 lines of incoming power supply. Data center has no requirement for AC and DC power supply due to load, as long as the effective value is within the range, so some data centers provide AC and DC power supply, and switch to another power supply when the original power supply is abnormal. However, due to the difference between AC power supply and DC power supply, especially the absence of zero point in DC power supply current, the mixed switching of AC-DC dual power supply is a new attempt, which requires new dual power supply technology to meet the complex and rapid performance requirements. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provides a kind of AC-DC dual power supply mixed cutting device and mixed cutting method with fast, high fire-fighting performance and long service life.

[0004] One of the above-mentioned purposes of the present application is achieved by the following technical solution:

[0005] An AC-DC dual power supply mixed cutting device is characterized in that: an AC power supply and a DC power supply are arranged on the input side of the power supply, and an energy consumption module is arranged on the output load side; the AC power supply and the DC power supply are electrically connected to the energy consumption module through an AC power supply line and a DC power supply line respectively; an AC side power supply switch is connected in series on the AC power supply line, and a DC side power supply switch is connected in series on the DC power supply line; one external connection point is arranged on the front end and the rear end of the AC side power supply switch on the live wire of the AC power supply line, and the two external connection points are connected to three parallel connected branch lines through two external connection lines; a first all-controlled power electronic device, an absorption capacitor C1 and a first voltage clamping type protection device are connected in series on the three branch lines respectively; one external connection point is arranged on the front end and the rear end of the DC side power supply switch on the line connected to the positive electrode of the power supply of the DC power supply line, and the two external connection points are connected to three parallel connected branch lines through two external connection lines; a second all-controlled power electronic device, an absorption capacitor C2 and a second voltage clamping type protection device are connected in series on the three branch lines connected to the DC power supply line respectively.

[0006] Furthermore, the first voltage clamping type protection device adopts a pressure sensitive resistor or a first TVS tube; and the second voltage clamping type protection device adopts a pressure sensitive resistor or a second TVS tube.

[0007] Furthermore, the first all-controlled power electronic device and the second all-controlled power electronic device both adopt bidirectional IGBT.

[0008] The second of the above objects of the present application is achieved by the following technical solution:

[0009] A hybrid cutting method based on the above AC-DC dual power hybrid cutting device, characterized by: including the process of switching AC power supply to DC power supply and the process of switching DC power supply to AC power supply;

[0010] The process of switching AC power supply to DC power supply is:

[0011] The device controller identifies the steep drop of AC voltage through fault, and prepares to switch the load power supply from AC power supply to DC power supply;

[0012] 2) First, the first full-control power electronic device is turned on in a waiting state;

[0013] 3) Open the AC side power supply switch, and the load current flows to the load through the first full-control power electronic device;

[0014] 4) Close the first full-control power electronic device, generate overvoltage, the load current passes through the branch circuit where the first voltage clamping type protection device is located, and the overvoltage disappears after the load side energy consumption module cooperates with processing, the first full-control power electronic device and the first voltage clamping type protection device both restore high resistance normal state;

[0015] 5) Finally, close the DC side power supply switch, complete the switching process;

[0016] The process of switching DC power supply to AC power supply is:

[0017] 1) The device controller identifies the steep drop of DC voltage through fault, and prepares to switch the load power supply from DC power supply to AC power supply;

[0018] 2) First, the second full-control power electronic device is turned on in a waiting state;

[0019] 3) Open the DC side power supply switch, and the load current flows to the load through the second full-control power electronic device;

[0020] 4) Close the second full-control power electronic device, generate overvoltage, the load current passes through the branch circuit where the second voltage clamping type protection device is located, and the overvoltage disappears after the load side energy consumption module cooperates with processing, the second full-control power electronic device and the second voltage clamping type protection device both restore high resistance normal state;

[0021] 5) Finally, close the AC side power supply switch, complete the switching process.

[0022] The present application has the advantages and positive effects:

[0023] 1. The AC / DC dual power supply hybrid switching device uses vacuum arc-extinguishing chamber (AC / DC switch components) and full-controlled power electronic devices (such as IGBT, IGCT, GTO) when switching power supply, no arc is generated during switching process, and no-arc switching is realized, so that the fire-fighting level is high and the service life is long.

[0024] 2. The AC / DC dual power supply hybrid switching device has pressure-sensitive resistor or first TVS tube connected in series on the external circuit at both ends of the AC side power supply switch, has pressure-sensitive resistor or second TVS tube connected in series on the external circuit at both ends of the DC side power supply switch, and has energy consumption module arranged at the output load side, and the multi-layer overvoltage protection during switching off is considered when switching power supply.

[0025] 3. The AC / DC dual power supply hybrid switching device is used in the process of switching power supply, and the full-controlled power electronic device only participates for a moment, and the energy consumption is negligible, so that it belongs to low-carbon energy-saving product.

[0026] 4. The patent is suitable for AC / DC hybrid power supply power protection places, such as Panama power supply system, and has good applicability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the connection schematic diagram of the present application in the state of switching off;

[0028] Figure 2 is the connection schematic diagram of the present application in the state of AC power supply;

[0029] Figure 3 is the connection schematic diagram of the present application in the state of DC power supply. DETAILED DESCRIPTION

[0030] The structure of the present application is further described below in combination with the drawings and through embodiments. It should be noted that the present embodiment is descriptive rather than limiting.

[0031] An AC / DC dual power supply hybrid switching device, please see Figures 1-3The application point is that an AC power supply and a DC power supply are arranged at the input side of the power supply, and an energy consumption module is arranged at the output load side, the AC power supply and the DC power supply are electrically connected with the energy consumption module through an AC power supply line and a DC power supply line respectively, an AC side power supply switch is connected in series on the AC power supply line, and a DC side power supply switch is connected in series on the DC power supply line. One external connection point is arranged at the front end and the rear end of the AC side power supply switch on the live wire of the AC power supply line respectively, the two external connection points are connected with three parallelly connected branch lines through two external connection lines, and a first bidirectional IGBT, an absorption capacitor C1, a pressure sensitive resistor or a first TVS tube R1 are connected in series on the three branch lines respectively. One external connection point is arranged at the front end and the rear end of the DC side power supply switch on the line connected with the positive pole of the power supply respectively, the two external connection points are connected with three parallelly connected branch lines through two external connection lines, and a second bidirectional IGBT, an absorption capacitor C2, a pressure sensitive resistor or a second TVS tube R2 are connected in series on the three branch lines respectively, wherein R1 and R2 are voltage clamping type protection devices.

[0032] As shown in Figure 1 , DL1 is an AC side power supply switch, Q1 is a full control type power electronic device, typically a bidirectional IGBT, and IGCT, GTO, etc. can also be adopted, but the performance price ratio of the bidirectional IGBT is better. C1 is an absorption capacitor, and R1 is a pressure sensitive resistor or a TVS tube. DL2 is a DC side power supply switch in the figure, Q2 is a power electronic device, typically a bidirectional IGBT, C2 is an absorption capacitor, and R2 is a pressure sensitive resistor or a TVS tube. Figure 1 It is the state when the switch is stopped, and DL1 and DL2 are both opened.

[0033] When the device is powered by an AC power supply, as shown in Figure 2 , DL1 is closed, and DL2 is opened. After the voltage of the AC power supply is suddenly reduced (the sudden reduction value is set by the customer, which is a settable function), the device controller identifies the fault, prepares to switch the load from the AC power supply to the DC power supply. Q1 is turned on in a waiting state, and when DL1 is opened, the load current flows to the load through Q1 at the moment when the contact changes from contact to separation, and no arc current is generated between the contacts of DL1. Then Q1 is turned off, overvoltage is generated, R1 limits the overvoltage to protect Q1, and the load current changes from Q1 to R1. After the overvoltage disappears through the cooperation of the load side energy consumption module, Q1 and R1 both return to the high resistance state, and then DL2 is closed, and the switching process is completed.

[0034] When the device is powered by a DC power supply, as shown in Figure 3DL2 is closed, DL1 is opened. When the DC power supply voltage drops suddenly, the device controller identifies the fault and prepares to switch the load from the DC power supply to the AC power supply. First, Q2 is turned on and is in a waiting state. When DL2 is opened, the load current flows through Q2 to the load, and no arc current is generated between the contacts of DL2. Then Q2 is turned off, and an overvoltage is generated. R2 limits the overvoltage to protect Q2. At the same time, the load current changes from Q2 to R2. After the overvoltage is eliminated by the load side energy consumption module, Q2 and R2 return to the high resistance state. Then DL1 is closed, and the switching process is completed.

[0035] The turning on and turning off of Q1 and Q2 are controlled by the device controller.

[0036] Although the embodiments of the present application and the drawings are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit of the present application and the appended claims, and therefore the scope of the present application is not limited to the disclosed embodiments and drawings.

Claims

1. An AC / DC dual power hybrid cutting device, characterized by: An alternating current power supply and a direct current power supply are arranged at the input side of a power supply, and an energy consumption module is arranged at the output load side, the alternating current power supply and the direct current power supply are electrically connected with the energy consumption module through alternating current power supply lines and direct current power supply lines respectively, an alternating current side power supply switch is connected in series on the alternating current power supply line, and a direct current side power supply switch is connected in series on the direct current power supply line; one external connection point is arranged at the front end and the rear end of the alternating current side power supply switch on the live wire of the alternating current power supply line, the two external connection points are connected with three parallelly connected branch lines through two external connection lines, and a first all-controllable power electronic device, an absorption capacitor C1 and a first voltage clamping type protection device are connected in series on the three branch lines; one external connection point is arranged at the front end and the rear end of the direct current side power supply switch on the line connected with the positive pole of the power supply, the two external connection points are connected with three parallelly connected branch lines through two external connection lines, and a second all-controllable power electronic device, an absorption capacitor C2 and a second voltage clamping type protection device are connected in series on the three branch lines connected with the direct current power supply line.

2. The AC / DC dual power hybrid cutting device according to claim 1, characterized in that: The first voltage clamping type protection device adopts a pressure sensitive resistor or a first TVS tube; and the second voltage clamping type protection device adopts a pressure sensitive resistor or a second TVS tube.

3. The AC / DC dual power hybrid cutting device according to claim 1, characterized in that: The first all-controllable power electronic device and the second all-controllable power electronic device both adopt bidirectional IGBT.

4. A hybrid cutting method based on the hybrid AC-DC power supply cutting device according to any one of claims 1-3, characterized in that: The process includes alternating current power supply switching to direct current power supply and direct current power supply switching to alternating current power supply; The process of alternating current power supply switching to direct current power supply is as follows: 1) the device controller identifies the situation of alternating current voltage steep drop through fault, and prepares to switch the load power supply from alternating current power supply to direct current power supply; 2) the first all-controllable power electronic device is first turned on and placed in a waiting state; 3) the alternating current side power supply switch is opened, and the load current flows to the load through the first all-controllable power electronic device; 4) the first all-controllable power electronic device is closed, overvoltage is generated, the load current passes through the branch circuit where the first voltage clamping type protection device is arranged, the overvoltage disappears after the load side energy consumption module is processed, and the first all-controllable power electronic device and the first voltage clamping type protection device both return to high resistance normal state; 5) finally, the direct current side power supply switch is closed, and the switching process is completed; The process of direct current power supply switching to alternating current power supply is as follows: 1) the device controller identifies the situation of direct current voltage steep drop through fault, and prepares to switch the load power supply from direct current power supply to alternating current power supply; 2) the second all-controllable power electronic device is first turned on and placed in a waiting state; 3) the direct current side power supply switch is opened, and the load current flows to the load through the second all-controllable power electronic device; 4) the second all-controllable power electronic device is closed, overvoltage is generated, the load current passes through the branch circuit where the second voltage clamping type protection device is arranged, the overvoltage disappears after the load side energy consumption module is processed, and the second all-controllable power electronic device and the second voltage clamping type protection device both return to high resistance normal state; 5) finally, the alternating current side power supply switch is closed, and the switching process is completed.

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