An AC / DC power supply circuit for ultrasonic testing equipment

Abstract

The invention discloses an AC / DC power supply circuit for ultrasonic detection equipment, the AC / DC power supply circuit comprising a three-speed six-pin switch, a first AC / DC conversion circuit, a second AC / DC conversion circuit, a first relay, a second relay, a charging module, a rechargeable battery and a load circuit. The beneficial effects are: when the load is powered, the three-speed six-pin switch is kept in the 1st gear state, when the AC power supply is powered, the first relay is automatically attracted to use the AC power supply to power the load circuit; when the AC power supply stops supplying power, the first relay is not attracted to use the rechargeable battery to power the load circuit through the second relay and the first relay; when the rechargeable battery needs to be charged; when the rechargeable battery is charged, the three-speed six-pin switch is kept in the 2nd gear state, the second relay is attracted to use the charging module to power the rechargeable battery; it can be adaptively switched between AC power supply and rechargeable battery power supply, simplifying the emergency power supply operation.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to an AC / DC power supply circuit for ultrasonic testing equipment. Background Art

[0002] Mobile locomotive axle ultrasonic detection equipment is specially used for ultrasonic detection of in-service locomotive axles, and usually uses batteries as the power supply. Mobile detection equipment should usually be charged before use to ensure that the battery power can meet the needs of the entire locomotive detection, but it cannot be ruled out that the power outage may occur due to work errors, failure to pre-charge or battery aging and damage. Mobile detection equipment is an automated device. If the power is cut off during the detection process, it is difficult to manually reset the equipment without damaging the equipment. Therefore, it is usually necessary to connect to an external power supply for emergency use. Existing mobile detection equipment mostly uses switches to switch emergency power supply. Since the probability of emergency power supply is small, it is not easy for operators to master the connection operation of the emergency power supply. Summary of the invention

[0003] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide an AC / DC power supply circuit for ultrasonic testing equipment.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] An AC / DC power supply circuit for ultrasonic detection equipment, the AC / DC power supply circuit comprising a three-speed six-pin switch, a first AC / DC conversion circuit, a second AC / DC conversion circuit, a first relay, a second relay, a charging module, a rechargeable battery and a load circuit, wherein pins 2 and 5 of the three-speed six-pin switch are connected to a 220V AC power supply;

[0006] Pins 1 and 4 of the three-speed six-pin switch are connected to the AC input terminal of the first AC-DC conversion circuit, the positive output terminal of the first AC-DC conversion circuit is connected to pins 1 and 6 of the first relay, the negative output terminal of the first AC-DC conversion circuit is connected to pin 8 of the first relay and the negative input terminal of the load circuit, and pins 2 and 5 of the first relay are connected to the positive input terminal of the load circuit;

[0007] Pins 3 and 6 of the three-speed six-pin switch are connected to the AC input terminal of the second AC-DC conversion circuit, the positive output terminal of the second AC-DC conversion circuit is connected to pin 1 of the second relay, and the negative output terminal of the second AC-DC conversion circuit is connected to pin 8 of the second relay;

[0008] Pin 3 of the three-speed six-pin switch is connected to the first AC input terminal of the charging module, pin 6 of the three-speed six-pin switch is connected to the second AC input terminal of the charging module, the positive output terminal of the charging module is connected to pin 6 of the second relay, and the negative output terminal of the charging module is connected to the negative electrode of the rechargeable battery;

[0009] The positive electrode of the rechargeable battery is connected to pins 3 and 5 of the second relay, the negative electrode of the rechargeable battery is connected to the negative input terminal of the load circuit, and pin 2 of the second relay is connected to pin 3 of the first relay.

[0010] The first AC-DC conversion circuit includes a first fuse, a first transformer, a first rectifier bridge, a first voltage stabilizing block, a second voltage stabilizing block, a third voltage stabilizing block, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor.

[0011] A first end of the primary coil of the first transformer is connected to pin No. 1 of a three-speed six-pin switch, a second end of the primary coil of the first transformer is connected to a first end of a first fuse, pin No. 4 of the three-speed six-pin switch is connected to a second end of the first fuse, a first end of the secondary coil of the first transformer is connected to a first AC input end of a first rectifier bridge, and a second end of the secondary coil of the first transformer is connected to a second AC input end of the first rectifier bridge;

[0012] The DC positive output terminal of the first rectifier bridge is connected to the positive electrode of the first capacitor, the positive electrode of the second capacitor, pin 3 of the first voltage stabilizing block, pin 3 of the second voltage stabilizing block, and pin 3 of the third voltage stabilizing block; the first end of the first resistor is connected to pin 2 of the first voltage stabilizing block, pin 2 of the second voltage stabilizing block, and pin 2 of the third voltage stabilizing block; the second end of the first resistor is connected to the first end of the second resistor, pin 1 of the first voltage stabilizing block, pin 1 of the second voltage stabilizing block, and pin 1 of the third voltage stabilizing block;

[0013] The DC negative output terminal of the first rectifier bridge is connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor, the second end of the second resistor, the negative electrode of the third capacitor, the negative electrode of the fourth capacitor, pin 8 of the first relay, and the negative input terminal of the load circuit.

[0014] Wherein, the second AC-DC conversion circuit includes a second transformer, a third rectifier bridge, a fifth capacitor, a sixth capacitor, a fourth resistor, and a second indicator light.

[0015] A first end of the primary coil of the second transformer is connected to pin 3 of a three-speed six-pin switch, a second end of the primary coil of the second transformer is connected to pin 6 of the three-speed six-pin switch, a first end of the secondary coil of the second transformer is connected to a first AC input end of a third rectifier bridge, and a second end of the secondary coil of the second transformer is connected to a second AC input end of the third rectifier bridge;

[0016] The DC positive output terminal of the third rectifier bridge is connected to the positive electrode of the fifth capacitor, the positive electrode of the sixth capacitor, the first end of the fourth resistor, and the pin 1 of the second relay, and the second end of the fourth resistor is connected to the positive electrode of the second indicator light;

[0017] The DC negative output terminal of the third rectifier bridge is connected to the negative electrode of the fifth capacitor, the negative electrode of the sixth capacitor, the negative electrode of the second indicator light, and pin No. 8 of the second relay.

[0018] Furthermore, it also includes a second fuse, a first end of the second fuse is connected to the first AC input end of the charging module and the first end of the primary coil of the second transformer, and a second end of the second fuse is connected to pin No. 3 of the three-speed six-pin switch.

[0019] Among them, the load circuit includes a two-speed four-pin switch, a third resistor, a first indicator light, and a load. Pin 1 of the two-speed four-pin switch is the positive input end of the load circuit, pin 3 of the two-speed four-pin switch is the negative input end of the load circuit, pin 2 of the two-speed four-pin switch is connected to the first end of the third resistor and the positive pole of the load, the second end of the third resistor is connected to the positive pole of the first indicator light, and pin 4 of the two-speed four-pin switch is connected to the negative pole of the first indicator light and the negative pole of the load.

[0020] Among them, a second diode is connected in parallel between pin No. 1 and pin No. 8 of the first relay, and a fourth diode is connected in parallel between pin No. 1 and pin No. 8 of the second relay.

[0021] The beneficial effects of the present invention are as follows: by arranging a three-speed six-pin switch, a first AC-DC conversion circuit, a second AC-DC conversion circuit, a first relay, a second relay, a charging module, a rechargeable battery and a load circuit; when the load is powered, the three-speed six-pin switch is kept in the 1st gear state, and when the AC power supply is supplied, the first relay is automatically attracted to use the AC power supply to supply power to the load circuit; when the AC power supply stops supplying power, the first relay is not attracted to use the rechargeable battery to supply power to the load circuit through the second relay and the first relay; when the rechargeable battery needs to be charged; when the rechargeable battery is charged, the three-speed six-pin switch is kept in the 2nd gear state, and the second relay is attracted to use the charging module to supply power to the rechargeable battery; adaptive switching can be performed between AC power supply and rechargeable battery power supply, thereby simplifying emergency power supply operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 is a circuit diagram of an AC / DC power supply circuit in the present invention;

[0024] Explanation of the numbers in the figure: S1-three-speed six-pin switch, S2-two-speed four-pin switch, K1-first relay, K2-second relay, BT1-rechargeable battery, F1-first fuse, F2-second fuse, T1-first transformer, T2-second transformer, D1-first rectifier bridge, D2-second diode, D3-third rectifier bridge, D4-fourth diode, LED1-first indicator light, LED2-second indicator light, U1-first voltage stabilizing block, U2-second voltage stabilizing block, U3-third voltage stabilizing block, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, RL-load. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] like Figure 1As shown, an AC / DC power supply circuit of an ultrasonic detection device, the AC / DC power supply circuit includes a three-speed six-pin switch S1, a first AC / DC conversion circuit, a second AC / DC conversion circuit, a first relay K1, a second relay K2, a charging module, a rechargeable battery BT1 and a load circuit, pins 2 and 5 of the three-speed six-pin switch S1 are connected to a 220V AC power supply; pins 1 and 4 of the three-speed six-pin switch S1 are connected to an AC input end of the first AC / DC conversion circuit, a positive output end of the first AC / DC conversion circuit is connected to pins 1 and 6 of the first relay K1, a negative output end of the first AC / DC conversion circuit is connected to pin 8 of the first relay K1 and a negative input end of the load circuit, and pins 2 and 5 of the first relay K1 are connected to a positive input end of the load circuit; the three-speed six-pin switch Pins 3 and 6 of switch S1 are connected to the AC input end of the second AC / DC conversion circuit, the positive output end of the second AC / DC conversion circuit is connected to pin 1 of the second relay K2, and the negative output end of the second AC / DC conversion circuit is connected to pin 8 of the second relay K2; Pin 3 of the three-speed six-pin switch is connected to the first AC input end of the charging module, pin 6 of the three-speed six-pin switch is connected to the second AC input end of the charging module, the positive output end of the charging module is connected to pin 6 of the second relay, and the negative output end of the charging module is connected to the negative pole of the rechargeable battery; the positive pole of the rechargeable battery BT1 is connected to pins 3 and 5 of the second relay K2, the negative pole of the rechargeable battery BT1 is connected to the negative input end of the load circuit, and pin 2 of the second relay K2 is connected to pin 3 of the first relay K1.

[0027] A second diode D2 is connected in parallel to pin No. 1 and pin No. 8 of the first relay K1 , and a fourth diode D4 is connected in parallel to pin No. 1 and pin No. 8 of the second relay K2 .

[0028] The first AC-DC conversion circuit includes a first fuse F1, a first transformer T1, a first rectifier bridge D1, a first voltage stabilizing block U1, a second voltage stabilizing block U2, a third voltage stabilizing block U3, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first end of the primary coil of the first transformer T1 is connected to pin No. 1 of the three-speed six-pin switch S1, the second end of the primary coil of the first transformer T1 is connected to the first end of the first fuse F1, pin No. 4 of the three-speed six-pin switch S1 is connected to the second end of the first fuse F1, the first end of the secondary coil of the first transformer T1 is connected to the first AC input end of the first rectifier bridge D1, and the second end of the secondary coil of the first transformer T1 is connected to the second AC input end of the first rectifier bridge D1; the DC positive The positive output terminal is connected with the positive electrode of the first capacitor C1, the positive electrode of the second capacitor C2, pin 3 of the first voltage stabilizing block U1, pin 3 of the second voltage stabilizing block U2, and pin 3 of the third voltage stabilizing block U3; the first end of the first resistor R1 is connected with pin 2 of the first voltage stabilizing block U1, pin 2 of the second voltage stabilizing block U2, and pin 2 of the third voltage stabilizing block U3; the second end of the first resistor R1 is connected with the first end of the second resistor R2, pin 1 of the first voltage stabilizing block U1, pin 1 of the second voltage stabilizing block U2, and pin 1 of the third voltage stabilizing block U3; the DC negative output terminal of the first rectifier bridge D1 is connected with the negative electrode of the first capacitor C1, the negative electrode of the second capacitor C2, the second end of the second resistor R2, the negative electrode of the third capacitor C3, the negative electrode of the fourth capacitor C4, pin 8 of the first relay, and the negative input terminal of the load circuit.

[0029] The second AC-DC conversion circuit includes a second transformer T2, a third rectifier bridge D3, a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, a second indicator LED2, and a second fuse F2. The first end of the primary coil of the second transformer T2 is connected to pin 3 of the three-speed six-pin switch S1, the first end of the second fuse F2 is connected to the first AC input end of the charging module and the first end of the primary coil of the second transformer T2, the second end of the second fuse F2 is connected to pin 3 of the three-speed six-pin switch S1, the second end of the primary coil of the second transformer T2 is connected to pin 6 of the three-speed six-pin switch S1, and the second end of the secondary of the second transformer T2 is connected to pin 10 of the three-speed six-pin switch S1. The first end of the secondary coil is connected to the first AC input end of the third rectifier bridge D3, and the second end of the secondary coil of the second transformer T2 is connected to the second AC input end of the third rectifier bridge D3; the DC positive output end of the third rectifier bridge D3 is connected to the positive electrode of the fifth capacitor C5, the positive electrode of the sixth capacitor C6, the first end of the fourth resistor R4, and the pin 1 of the second relay K2, and the second end of the fourth resistor R4 is connected to the positive electrode of the second indicator LED2; the DC negative output end of the third rectifier bridge D3 is connected to the negative electrode of the fifth capacitor C5, the negative electrode of the sixth capacitor C6, the negative electrode of the second indicator LED2, and the pin 8 of the second relay K2.

[0030] The load circuit includes a two-speed four-pin switch S2, a third resistor R3, a first indicator light LED1, and a load RL. Pin 1 of the two-speed four-pin switch S2 is the positive input terminal of the load circuit, pin 3 of the two-speed four-pin switch S2 is the negative input terminal of the load circuit, pin 2 of the two-speed four-pin switch S2 is connected to the first end of the third resistor R3 and the positive electrode of the load, the second end of the third resistor R3 is connected to the positive electrode of the first indicator light LED1, and pin 4 of the two-speed four-pin switch S2 is connected to the negative electrode of the first indicator light LED2 and the negative electrode of the load RL.

[0031] Working principle:

[0032] 1. 220V AC power supply mode

[0033] Connect to 220V AC power, set the three-speed six-pin switch K1 to gear 1 (i.e., pin 2 of the three-speed six-pin switch is connected to pin 1, and pin 5 of the three-speed six-pin switch is connected to pin 4), close the two-speed four-pin switch, generate DC power through the first transformer T1 and the first rectifier bridge D1, and then pass through three parallel TL1803 voltage regulator blocks (first voltage regulator block U1, second voltage regulator block U2, third voltage regulator block U3) to output a DC24V power supply with a maximum current of up to 22.5A by configuring the first resistor R1 and the second resistor R2. At the same time, the first relay K1 is energized (i.e., pin 6 of the first relay is connected to pin 5, and pin 3 of the first relay is disconnected from pin 2), and the generated DC power is output to the load RL through the two-speed four-pin switch S2.

[0034] 2. Rechargeable battery power supply mode

[0035] No 220V AC power is connected, the three-speed six-pin switch K1 is set to gear 1 (i.e. pin 2 of the three-speed six-pin switch is connected to pin 1, and pin 5 of the three-speed six-pin switch is connected to pin 4), the two-speed four-pin switch is closed, the first relay K1 is not energized (i.e. pin 6 of the first relay is disconnected from pin 5, and pin 3 of the first relay is connected to pin 2), the second relay K2 is not energized (i.e. pin 6 of the second relay is disconnected from pin 5, and pin 3 of the second relay is connected to pin 2), and the power of the rechargeable battery BT1 is supplied to the load RL through the second relay K2, the first relay K1, and the two-speed four-pin switch S2.

[0036] 3. Rechargeable battery charging mode

[0037] Connect to 220V AC power, set the three-speed six-pin switch K1 to gear 2 (i.e., pin 2 of the three-speed six-pin switch is connected to pin 3, and pin 5 of the three-speed six-pin switch is connected to pin 6), close the two-speed four-pin switch, and generate a low-voltage DC power supply through the second transformer T2 and the third rectifier bridge D3, so that the second relay K2 is energized (i.e., pin 6 of the second relay is connected to pin 5, and pin 3 of the second relay is disconnected from pin 2), and the charging module is running at the same time, charging the rechargeable battery BT1, and the second relay K2 is energized to disconnect the power supply to the load RL.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An AC / DC power supply circuit for ultrasonic testing equipment, characterized in that: The AC / DC power supply circuit includes a three-speed six-pin switch, a first AC / DC conversion circuit, a second AC / DC conversion circuit, a first relay, a second relay, a charging module, a rechargeable battery and a load circuit, and pins 2 and 5 of the three-speed six-pin switch are connected to a 220V AC power supply; Pins 1 and 4 of the three-speed six-pin switch are connected to the AC input terminal of the first AC-DC conversion circuit, the positive output terminal of the first AC-DC conversion circuit is connected to pins 1 and 6 of the first relay, the negative output terminal of the first AC-DC conversion circuit is connected to pin 8 of the first relay and the negative input terminal of the load circuit, and pins 2 and 5 of the first relay are connected to the positive input terminal of the load circuit; Pins 3 and 6 of the three-speed six-pin switch are connected to the AC input terminal of the second AC-DC conversion circuit, the positive output terminal of the second AC-DC conversion circuit is connected to pin 1 of the second relay, and the negative output terminal of the second AC-DC conversion circuit is connected to pin 8 of the second relay; Pin 3 of the three-speed six-pin switch is connected to the first AC input terminal of the charging module, pin 6 of the three-speed six-pin switch is connected to the second AC input terminal of the charging module, the positive output terminal of the charging module is connected to pin 6 of the second relay, and the negative output terminal of the charging module is connected to the negative electrode of the rechargeable battery; The positive electrode of the rechargeable battery is connected to pins 3 and 5 of the second relay, the negative electrode of the rechargeable battery is connected to the negative input terminal of the load circuit, and pin 2 of the second relay is connected to pin 3 of the first relay.

2. The AC / DC power supply circuit according to claim 1, characterized in that: The first AC-DC conversion circuit includes a first fuse, a first transformer, a first rectifier bridge, a first voltage stabilizing block, a second voltage stabilizing block, a third voltage stabilizing block, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor. A first end of the primary coil of the first transformer is connected to pin No. 1 of a three-speed six-pin switch, a second end of the primary coil of the first transformer is connected to a first end of a first fuse, pin No. 4 of the three-speed six-pin switch is connected to a second end of the first fuse, a first end of the secondary coil of the first transformer is connected to a first AC input end of a first rectifier bridge, and a second end of the secondary coil of the first transformer is connected to a second AC input end of the first rectifier bridge; The DC positive output terminal of the first rectifier bridge is connected to the positive electrode of the first capacitor, the positive electrode of the second capacitor, pin 3 of the first voltage stabilizing block, pin 3 of the second voltage stabilizing block, and pin 3 of the third voltage stabilizing block; the first end of the first resistor is connected to pin 2 of the first voltage stabilizing block, pin 2 of the second voltage stabilizing block, and pin 2 of the third voltage stabilizing block; the second end of the first resistor is connected to the first end of the second resistor, pin 1 of the first voltage stabilizing block, pin 1 of the second voltage stabilizing block, and pin 1 of the third voltage stabilizing block; The DC negative output terminal of the first rectifier bridge is connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor, the second end of the second resistor, the negative electrode of the third capacitor, the negative electrode of the fourth capacitor, pin 8 of the first relay, and the negative input terminal of the load circuit.

3. The AC / DC power supply circuit according to claim 1, characterized in that: The second AC-DC conversion circuit includes a second transformer, a third rectifier bridge, a fifth capacitor, a sixth capacitor, a fourth resistor, and a second indicator light. A first end of the primary coil of the second transformer is connected to pin 3 of a three-speed six-pin switch, a second end of the primary coil of the second transformer is connected to pin 6 of the three-speed six-pin switch, a first end of the secondary coil of the second transformer is connected to a first AC input end of a third rectifier bridge, and a second end of the secondary coil of the second transformer is connected to a second AC input end of the third rectifier bridge; The DC positive output terminal of the third rectifier bridge is connected to the positive electrode of the fifth capacitor, the positive electrode of the sixth capacitor, the first end of the fourth resistor, and the pin 1 of the second relay, and the second end of the fourth resistor is connected to the positive electrode of the second indicator light; The DC negative output terminal of the third rectifier bridge is connected to the negative electrode of the fifth capacitor, the negative electrode of the sixth capacitor, the negative electrode of the second indicator light, and pin No. 8 of the second relay.

4. The AC / DC power supply circuit according to claim 3, characterized in that: It also includes a second fuse, a first end of the second fuse is connected to the first AC input end of the charging module and the first end of the primary coil of the second transformer, and a second end of the second fuse is connected to pin No. 3 of the three-speed six-pin switch.

5. The AC / DC power supply circuit according to claim 1, characterized in that: The load circuit includes a two-speed four-pin switch, a third resistor, a first indicator light, and a load. Pin 1 of the two-speed four-pin switch is the positive input terminal of the load circuit, pin 3 of the two-speed four-pin switch is the negative input terminal of the load circuit, pin 2 of the two-speed four-pin switch is connected to the first end of the third resistor and the positive pole of the load, the second end of the third resistor is connected to the positive pole of the first indicator light, and pin 4 of the two-speed four-pin switch is connected to the negative pole of the first indicator light and the negative pole of the load.

6. The AC / DC power supply circuit according to claim 1, characterized in that: A second diode is connected in parallel between pin No. 1 and pin No. 8 of the first relay, and a fourth diode is connected in parallel between pin No. 1 and pin No. 8 of the second relay.

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