Uninterrupted DC three-phase AC / DC power supply and power supply system

Abstract

The utility model discloses an uninterrupted DC three-phase AC / DC power supply and a power supply system. Relates to the technical field of AC-DC power supply. The sampling circuit is used for collecting voltages of a mains supply, a first standby power supply and a second standby power supply; the decision-making circuit is used for carrying out logic judgment on the voltage and generating a decision-making instruction; the driving circuit is used for driving the mains supply, the first standby power supply or the second standby power supply to supply power according to the decision instruction; the sampling circuit is electrically connected with the decision circuit; the decision circuit is electrically connected with the driving circuit; the driving circuit is electrically connected with the mains supply, the first standby power supply and the second standby power supply; according to the scheme, the structure is improved on the basis of the traditional alternating current and direct current power supply technology, the decision-making circuit performs logic judgment on the voltages of the mains supply, the first standby power supply and the second standby power supply and generates the decision-making instruction, and the mains supply, the first standby power supply and the second standby power supply are quickly and automatically switched to supply power according to the decision-making instruction.

Description

Technical Field

[0001] The utility model relates to the technical field of AC and DC power supply, in particular to an uninterruptible DC three-phase AC and DC power supply and a power supply system. Background Art

[0002] Industrial emergency equipment, vehicle-mounted power supplies, and other equipment primarily use AC and DC power supply. AC power is directly switched between the two and converted to DC power to ensure stable system operation and power supply continuity. Traditional equipment often cannot achieve fast switching when switching between AC and DC, seriously affecting the normal operation of downstream equipment. Utility Model Content

[0003] The technical problem to be solved by the present invention is that, in traditional equipment, rapid switching is often not achieved during AC / DC switching, which seriously affects the normal operation of subsequent equipment. The purpose of this solution is to provide an uninterruptible DC three-phase AC / DC power supply and power supply system, which makes structural improvements on traditional AC / DC power supply technology. The decision circuit performs logical judgment on the voltages of the mains power supply, the first backup power supply, and the second backup power supply and generates a decision instruction, so that the mains power supply, the first backup power supply, and the second backup power supply can be quickly and automatically switched according to the decision instruction.

[0004] The utility model is achieved through the following technical solutions:

[0005] This solution provides an uninterruptible three-phase DC power supply, including:

[0006] A sampling circuit, used for collecting voltages of the mains power supply, the first backup power supply, and the second backup power supply; the sampling circuit is electrically connected to the decision circuit;

[0007] A decision circuit, configured to perform logic judgment on the voltage and generate a decision instruction; the decision circuit is electrically connected to the drive circuit;

[0008] The driving circuit is used to drive the mains power supply, the first backup power supply or the second backup power supply to supply power according to the decision instruction; the driving circuit is electrically connected to the mains power supply, the first backup power supply and the second backup power supply.

[0009] Working principle of this solution: In traditional equipment, AC / DC switching often cannot be achieved quickly, which seriously affects the normal operation of subsequent equipment; the purpose of this solution is to provide an uninterruptible DC three-phase AC / DC power supply and power supply system, and make structural improvements on traditional AC / DC power supply technology. The decision circuit performs logical judgment on the voltages of the mains power supply, the first backup power supply, and the second backup power supply and generates decision instructions, so that the mains power supply, the first backup power supply, and the second backup power supply can quickly and automatically switch power supply according to the decision instructions.

[0010] A further optimization solution is that the sampling circuit includes a mains power sampling circuit and a backup power sampling circuit; the mains power sampling circuit is used to collect the voltage of the mains power supply; the backup power sampling circuit is used to collect the voltage of the first backup power supply and the second backup power supply.

[0011] A further optimized solution is that the mains power sampling circuit includes:

[0012] Transformer T1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, operational amplifier U1, diode D1 and diode D2;

[0013] The primary side of transformer T1 is connected to the mains power supply; the first end of the secondary side of transformer T1 is connected in series with resistor R1 and then connected to the positive input terminal of operational amplifier U1; the second end of the secondary side of transformer T1 is connected in series with resistors R2 and R4 and then connected to the output terminal of operational amplifier U1; the negative input terminal of operational amplifier U1 is connected between resistors R2 and R4; capacitor C2 is connected in parallel on both sides of resistor R4; one end of resistor R3 is connected to the 1.5V power supply and the other end is connected to the positive input terminal of operational amplifier U1, and capacitor C1 is connected in parallel on both sides of resistor R3; the output terminal of operational amplifier U1 is connected in series with resistor R5 and serves as the sampling output terminal;

[0014] One end of the resistor R6 is grounded, and the other end is connected to the output end of the operational amplifier U1. The cathode of the diode D1 is connected to the anode of the diode D2. The cathode of the diode D2 is connected to the power supply VCC. The anode of the diode D1 is grounded.

[0015] A further optimization solution is as follows: resistor R1 is 68KΩ, resistor R2 is 68KΩ, resistor R3 is 4.7KΩ, resistor R4 is 4.7KΩ, resistor R5 is 200Ω, resistor R6 is 10KΩ, capacitor C1 is 100pF, and capacitor C2 is 100pF.

[0016] A further optimized solution is that the backup power sampling circuit includes:

[0017] Transformer T2, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, capacitor C3, capacitor C4, operational amplifier U2, diode D3 and diode D4;

[0018] The primary side of transformer T2 is connected to the backup power supply; the first end of the secondary side of transformer T2 is connected in series with resistor R7 and then connected to the positive input terminal of operational amplifier U2; the second end of the secondary side of transformer T2 is connected in series with resistors R8 and R10 and then connected to the output terminal of operational amplifier U2; capacitor C4 is connected in parallel on both sides of resistor R10;

[0019] One end of resistor R9 is connected to a 1.5V power supply, and the other end is connected to the positive input terminal of operational amplifier U2. Capacitor C3 is connected in parallel on both sides of resistor R9. The output end of operational amplifier U2 is connected in series with resistor R11 as the sampling output end.

[0020] One end of the resistor R12 is grounded, and the other end is connected to the output end of the operational amplifier U2. The cathode of the diode D3 is connected to the anode of the diode D4. The cathode of the diode D4 is connected to the power supply VCC. The anode of the diode D3 is grounded.

[0021] A further optimization solution is that resistor R7 is 68KΩ, resistor R8 is 68KΩ, resistor R9 is 4.7KΩ, resistor R10 is 4.7KΩ, resistor R11 is 200Ω, resistor R12 is 10KΩ, capacitor C3 is 100pF, and capacitor C4 is 100pF.

[0022] A further optimized solution is that the decision circuit includes a first comparator, a second comparator, a third comparator, a first OR gate, a second OR gate and a three-choose-one circuit;

[0023] The sampling output terminal of the mains power sampling circuit is connected to the first input terminal of the first comparator, the preset mains threshold power supply is connected to the second input terminal of the first comparator, the first output terminal of the first comparator is connected to the first input terminal of the three-select-one circuit, and the second output terminal of the first comparator is connected to the first input terminal of the first OR gate;

[0024] The sampling output terminal of the first backup power sampling circuit is connected to the first input terminal of the second comparator, the preset first threshold power supply is connected to the second input terminal of the second comparator, the first output terminal of the second comparator is connected to the second input terminal of the first OR gate, and the output terminal of the first OR gate is connected to the second input terminal of the three-select-one circuit;

[0025] The second output end of the second comparator is connected to the first input end of the second OR gate, the sampling output end of the second backup power supply sampling circuit is connected to the first input end of the third comparator, the preset second threshold power supply is connected to the second input end of the third comparator, the output end of the third comparator is connected to the second input end of the second OR gate, and the output end of the second OR gate is connected to the third input end of the three-selection circuit.

[0026] A further optimized solution is that the driving circuit includes: a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C5, a transistor Q1, a diode D5 and a relay K;

[0027] One end of the resistor R13 is connected to the drive command input port, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded; one end of the resistor R14 is connected to the base of the transistor Q1, and the other end is connected to the emitter of the transistor Q1; one end of the coil of the relay K is connected to the collector of the transistor Q1, and the other end is connected to the resistor R16 and then to the power supply VCC;

[0028] One end of the resistor R15 is connected to the emitter of the transistor Q1 , and the other end is connected to the anode of the diode D5 . The cathode of the diode D5 is connected between the resistor R16 and the coil of the relay K.

[0029] A further optimization solution is that the resistor R13 is 1KΩ, the resistor R14 is 10KΩ, the resistor R15 is 10KΩ, the resistor R16 is 10KΩ, and the capacitor C5 is 0.1μF.

[0030] This solution provides an uninterruptible DC three-phase AC / DC power supply system, including the above-mentioned uninterruptible DC three-phase AC / DC power supply.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] The utility model provides an uninterruptible three-phase DC power supply and power supply system, which makes structural improvements on the traditional AC / DC power supply technology. The decision circuit performs logical judgment on the voltages of the mains power supply, the first backup power supply, and the second backup power supply and generates a decision instruction, so that the mains power supply, the first backup power supply, and the second backup power supply can be quickly and automatically switched according to the decision instruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0034] Figure 1 It is a schematic diagram of the structure of an uninterruptible DC three-phase AC / DC power supply;

[0035] Figure 2 This is a schematic diagram of the mains power sampling circuit;

[0036] Figure 3 This is a schematic diagram of the backup power sampling circuit;

[0037] Figure 4 Schematic diagram of the decision circuit;

[0038] Figure 5 Schematic diagram of the driving circuit. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0040] In traditional AC / DC power supply technology, AC / DC switching often cannot be achieved quickly, seriously affecting the normal operation of downstream equipment. In view of this, this solution provides the following embodiments to solve the above technical problems:

[0041] Example 1

[0042] This embodiment provides an uninterruptible three-phase DC power supply. Figure 1 Shown, including:

[0043] A sampling circuit, used for collecting voltages of the mains power supply, the first backup power supply, and the second backup power supply; the sampling circuit is electrically connected to the decision circuit;

[0044] A decision circuit, configured to perform logic judgment on the voltage and generate a decision instruction; the decision circuit is electrically connected to the drive circuit;

[0045] The driving circuit is used to drive the mains power supply, the first backup power supply or the second backup power supply to supply power according to the decision instruction; the driving circuit is electrically connected to the mains power supply, the first backup power supply and the second backup power supply.

[0046] The sampling circuit includes a mains power sampling circuit and a backup power sampling circuit; the mains power sampling circuit is used to collect the voltage of the mains power supply; the backup power sampling circuit is used to collect the voltages of the first backup power supply and the second backup power supply.

[0047] like Figure 2 As shown, the mains power sampling circuit includes:

[0048] Transformer T1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, operational amplifier U1, diode D1 and diode D2;

[0049] The primary side of transformer T1 is connected to the mains power supply; the first end of the secondary side of transformer T1 is connected in series with resistor R1 and then connected to the positive input terminal of operational amplifier U1; the second end of the secondary side of transformer T1 is connected in series with resistors R2 and R4 and then connected to the output terminal of operational amplifier U1; the negative input terminal of operational amplifier U1 is connected between resistors R2 and R4; capacitor C2 is connected in parallel on both sides of resistor R4; one end of resistor R3 is connected to the 1.5V power supply and the other end is connected to the positive input terminal of operational amplifier U1, and capacitor C1 is connected in parallel on both sides of resistor R3; the output terminal of operational amplifier U1 is connected in series with resistor R5 and serves as the sampling output terminal;

[0050] One end of the resistor R6 is grounded, and the other end is connected to the output end of the operational amplifier U1. The cathode of the diode D1 is connected to the anode of the diode D2. The cathode of the diode D2 is connected to the power supply VCC. The anode of the diode D1 is grounded.

[0051] Resistor R1 is 68KΩ, resistor R2 is 68KΩ, resistor R3 is 4.7KΩ, resistor R4 is 4.7KΩ, resistor R5 is 200Ω, resistor R6 is 10KΩ, capacitor C1 is 100pF, and capacitor C2 is 100pF.

[0052] like Figure 3 As shown, the backup power sampling circuit includes:

[0053] Transformer T2, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, capacitor C3, capacitor C4, operational amplifier U2, diode D3 and diode D4;

[0054] The primary side of transformer T2 is connected to the backup power supply; the first end of the secondary side of transformer T2 is connected in series with resistor R7 and then connected to the positive input terminal of operational amplifier U2; the second end of the secondary side of transformer T2 is connected in series with resistors R8 and R10 and then connected to the output terminal of operational amplifier U2; capacitor C4 is connected in parallel on both sides of resistor R10;

[0055] One end of resistor R9 is connected to a 1.5V power supply, and the other end is connected to the positive input terminal of operational amplifier U2. Capacitor C3 is connected in parallel on both sides of resistor R9. The output end of operational amplifier U2 is connected in series with resistor R11 as the sampling output end.

[0056] One end of the resistor R12 is grounded, and the other end is connected to the output end of the operational amplifier U2. The cathode of the diode D3 is connected to the anode of the diode D4. The cathode of the diode D4 is connected to the power supply VCC. The anode of the diode D3 is grounded.

[0057] Resistor R7 is 68KΩ, resistor R8 is 68KΩ, resistor R9 is 4.7KΩ, resistor R10 is 4.7KΩ, resistor R11 is 200Ω, resistor R12 is 10KΩ, capacitor C3 is 100pF, and capacitor C4 is 100pF.

[0058] like Figure 4 As shown, the decision circuit includes a first comparator B1, a second comparator B2, a third comparator B3, a first OR gate H1, a second OR gate H2 and a three-select-one circuit M;

[0059] The sampling output terminal of the mains power sampling circuit is connected to the first input terminal of the first comparator B1, the preset mains threshold power supply is connected to the second input terminal of the first comparator B1, the first output terminal of the first comparator is connected to the first input terminal of the three-select-one circuit M, and the second output terminal of the first comparator B1 is connected to the first input terminal of the first OR gate H1;

[0060] The sampling output terminal of the first backup power sampling circuit is connected to the first input terminal of the second comparator, the preset first threshold power supply is connected to the second input terminal of the second comparator B2, the first output terminal of the second comparator B2 is connected to the second input terminal of the first OR gate, and the output terminal of the first OR gate H1 is connected to the second input terminal of the three-select-one circuit M;

[0061] The second output end of the second comparator B2 is connected to the first input end of the second OR gate H2, the sampling output end of the second backup power supply sampling circuit is connected to the first input end of the third comparator B3, the preset second threshold power supply is connected to the second input end of the third comparator B3, the output end of the third comparator B3 is connected to the second input end of the second OR gate H2, and the output end of the second OR gate H2 is connected to the third input end of the three-selection circuit.

[0062] like Figure 5 As shown, the driving circuit includes: a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C5, a transistor Q1, a diode D5 and a relay K;

[0063] One end of the resistor R13 is connected to the drive command input port, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded; one end of the resistor R14 is connected to the base of the transistor Q1, and the other end is connected to the emitter of the transistor Q1; one end of the coil of the relay K is connected to the collector of the transistor Q1, and the other end is connected to the resistor R16 and then to the power supply VCC;

[0064] One end of the resistor R15 is connected to the emitter of the transistor Q1 , and the other end is connected to the anode of the diode D5 . The cathode of the diode D5 is connected between the resistor R16 and the coil of the relay K.

[0065] The resistor R13 is 1KΩ, the resistor R14 is 10KΩ, the resistor R15 is 10KΩ, the resistor R16 is 10KΩ, and the capacitor C5 is 0.1μF.

[0066] Example 2

[0067] This embodiment provides an uninterruptible DC three-phase AC / DC power supply system, including the uninterruptible DC three-phase AC / DC power supply described in Example 1.

[0068] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. An uninterruptible three-phase DC power supply, characterized in that: include: A sampling circuit, used for collecting voltages of the mains power supply, the first backup power supply and the second backup power supply; The sampling circuit is electrically connected to the decision circuit; A decision circuit, configured to perform logic judgment on the voltage and generate a decision instruction; the decision circuit is electrically connected to the drive circuit; The driving circuit is used to drive the mains power supply, the first backup power supply or the second backup power supply to supply power according to the decision instruction; the driving circuit is electrically connected to the mains power supply, the first backup power supply and the second backup power supply.

2. The uninterruptible three-phase DC power supply according to claim 1, characterized in that: The sampling circuit includes a mains power sampling circuit and a backup power sampling circuit; the mains power sampling circuit is used to collect the voltage of the mains power supply; the backup power sampling circuit is used to collect the voltages of the first backup power supply and the second backup power supply.

3. The uninterruptible three-phase DC power supply according to claim 2, characterized in that: The mains power sampling circuit comprises: Transformer T1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2, operational amplifier U1, diode D1 and diode D2; The primary side of transformer T1 is connected to the mains power supply; the first end of the secondary side of transformer T1 is connected in series with resistor R1 and then connected to the positive input terminal of operational amplifier U1; the second end of the secondary side of transformer T1 is connected in series with resistors R2 and R4 and then connected to the output terminal of operational amplifier U1; the negative input terminal of operational amplifier U1 is connected between resistors R2 and R4; capacitor C2 is connected in parallel on both sides of resistor R4; one end of resistor R3 is connected to the 1.5V power supply and the other end is connected to the positive input terminal of operational amplifier U1, and capacitor C1 is connected in parallel on both sides of resistor R3; the output terminal of operational amplifier U1 is connected in series with resistor R5 and serves as the sampling output terminal; One end of the resistor R6 is grounded, and the other end is connected to the output end of the operational amplifier U1. The cathode of the diode D1 is connected to the anode of the diode D2. The cathode of the diode D2 is connected to the power supply VCC. The anode of the diode D1 is grounded.

4. The uninterruptible three-phase DC power supply according to claim 3, characterized in that: Resistor R1 is 68KΩ, resistor R2 is 68KΩ, resistor R3 is 4.7KΩ, resistor R4 is 4.7KΩ, resistor R5 is 200Ω, resistor R6 is 10KΩ, capacitor C1 is 100pF, and capacitor C2 is 100pF.

5. The uninterruptible three-phase DC power supply according to claim 2, characterized in that: The backup power sampling circuit includes: Transformer T2, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, capacitor C3, capacitor C4, operational amplifier U2, diode D3 and diode D4; The primary side of transformer T2 is connected to the backup power supply; the first end of the secondary side of transformer T2 is connected in series with resistor R7 and then connected to the positive input terminal of operational amplifier U2; the second end of the secondary side of transformer T2 is connected in series with resistors R8 and R10 and then connected to the output terminal of operational amplifier U2; capacitor C4 is connected in parallel on both sides of resistor R10; One end of resistor R9 is connected to a 1.5V power supply, and the other end is connected to the positive input terminal of operational amplifier U2. Capacitor C3 is connected in parallel on both sides of resistor R9. The output end of operational amplifier U2 is connected in series with resistor R11 as the sampling output end. One end of the resistor R12 is grounded, and the other end is connected to the output end of the operational amplifier U2. The cathode of the diode D3 is connected to the anode of the diode D4. The cathode of the diode D4 is connected to the power supply VCC. The anode of the diode D3 is grounded.

6. The uninterruptible three-phase DC power supply according to claim 5, characterized in that: Resistor R7 is 68KΩ, resistor R8 is 68KΩ, resistor R9 is 4.7KΩ, resistor R10 is 4.7KΩ, resistor R11 is 200Ω, resistor R12 is 10KΩ, capacitor C3 is 100pF, and capacitor C4 is 100pF.

7. The uninterruptible three-phase DC power supply according to claim 1, characterized in that: The decision circuit includes a first comparator, a second comparator, a third comparator, a first OR gate, a second OR gate and a three-select-one circuit; The sampling output terminal of the mains power sampling circuit is connected to the first input terminal of the first comparator, the preset mains threshold power supply is connected to the second input terminal of the first comparator, the first output terminal of the first comparator is connected to the first input terminal of the three-select-one circuit, and the second output terminal of the first comparator is connected to the first input terminal of the first OR gate; The sampling output terminal of the first backup power sampling circuit is connected to the first input terminal of the second comparator, the preset first threshold power supply is connected to the second input terminal of the second comparator, the first output terminal of the second comparator is connected to the second input terminal of the first OR gate, and the output terminal of the first OR gate is connected to the second input terminal of the three-select-one circuit; The second output end of the second comparator is connected to the first input end of the second OR gate, the sampling output end of the second backup power supply sampling circuit is connected to the first input end of the third comparator, the preset second threshold power supply is connected to the second input end of the third comparator, the output end of the third comparator is connected to the second input end of the second OR gate, and the output end of the second OR gate is connected to the third input end of the three-selection circuit.

8. The uninterruptible three-phase DC power supply according to claim 7, characterized in that: The driving circuit includes: a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C5, a transistor Q1, a diode D5 and a relay K; One end of the resistor R13 is connected to the drive command input port, and the other end is connected to the base of the transistor Q1; the emitter of the transistor Q1 is grounded; one end of the resistor R14 is connected to the base of the transistor Q1, and the other end is connected to the emitter of the transistor Q1; one end of the coil of the relay K is connected to the collector of the transistor Q1, and the other end is connected to the resistor R16 and then to the power supply VCC; One end of the resistor R15 is connected to the emitter of the transistor Q1 , and the other end is connected to the anode of the diode D5 . The cathode of the diode D5 is connected between the resistor R16 and the coil of the relay K.

9. The uninterruptible three-phase DC power supply according to claim 8, characterized in that: The resistor R13 is 1KΩ, the resistor R14 is 10KΩ, the resistor R15 is 10KΩ, the resistor R16 is 10KΩ, and the capacitor C5 is 0.1μF.

10. An uninterruptible three-phase AC / DC power supply system, characterized in that: An uninterruptible direct current three-phase AC / DC power supply comprising any one of claims 1-9.

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