Ship frequency conversion speed regulation circuit
By introducing overcurrent detection and protection sub-circuits into the ship's frequency conversion speed regulation circuit, the equipment damage caused by overcurrent is solved, rapid protection and equipment safety are achieved, maintenance costs are reduced, and system response speed and operating efficiency are improved.
Patent Information
- Application Number
- CN202422058098.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The existing ship frequency conversion speed regulation circuit is prone to overcurrent in the inverter circuit, resulting in device damage, and the existing protective measures are slow to respond and have high maintenance costs.
The overcurrent detection sub-circuit and the overcurrent protection sub-circuit are adopted, and the overcurrent protection sub-circuit is controlled to automatically cut off the power output when overcurrent is detected, preventing damage to the inverter and motor, and enhancing the safety and reliability of the system through light alarms.
It realizes rapid protection of equipment, reduces safety risks, reduces maintenance costs, improves system response speed and operation efficiency, and ensures the continuity and stability of equipment.
Smart Images
Figure CN223052955U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of ship variable frequency speed regulation, and particularly relates to a ship variable frequency speed regulation circuit. Background Technique
[0002] The ship variable frequency speed regulation circuit is one of the core technologies of modern ship electric propulsion systems. It can effectively control the speed of the ship propulsion motor, thereby adjusting the running speed of the ship.
[0003] In the existing ship variable frequency speed regulation circuit, overcurrent sometimes occurs in the inverter circuit, resulting in device damage. Some ships use fuses for protection. Although fuses can provide a certain degree of overcurrent protection, their response speed is slow and they cannot provide fast protection for high-performance devices. Frequent overcurrent damage requires more maintenance work, leading to an increase in maintenance costs. Content of the Utility Model
[0004] Purpose of the Utility Model: To provide a ship variable frequency speed regulation circuit, which solves the above problems existing in the prior art.
[0005] Technical Solution: A ship variable frequency speed regulation circuit includes an inverter. The input end of the inverter is connected to an external power supply, the output end of the inverter is connected to the input end of a variable frequency speed regulation sub-circuit, the output end of the variable frequency speed regulation sub-circuit is simultaneously connected to the input end of an overcurrent detection sub-circuit and a motor, the overcurrent detection sub-circuit is used to detect the output current of the variable frequency speed regulation sub-circuit, the output end of the overcurrent detection sub-circuit is connected to chip U1, the input end of chip U1 is connected to an external power supply, the output end of chip U1 is connected to the input end of an overcurrent protection sub-circuit, and the output end of the overcurrent protection sub-circuit is connected to the input end of the inverter.
[0006] Preferably, the variable-frequency speed-regulating sub-circuit includes a switch S1, diodes D6, D7, D8, D9, a capacitor C6, field-effect transistors VT1, VT2, VT3, VT4, VT5, and VT6. The switch S1 is connected to the output terminal of the inverter. The positive electrode of the diode D6 is connected to the positive electrode of the diode D7 and is also connected to the switch S1. The negative electrode of the diode D6 is simultaneously connected to the positive electrode of the diode D8, the capacitor C6, the pin 2 of the field-effect transistor VT1, the pin 2 of the field-effect transistor VT3, and the pin 2 of the field-effect transistor VT5. The negative electrode of the diode D7 is simultaneously connected to the negative electrode of the diode D9, the other end of the capacitor C6, the pin 3 of the field-effect transistor VT2, the pin 3 of the field-effect transistor VT4, and the pin 3 of the field-effect transistor VT6. The negative electrode of the diode D8 is connected to the positive electrode of the diode D9. The pin 3 of the field-effect transistor VT1 is simultaneously connected to the pin 2 of the field-effect transistor VT2 and the motor. The pin 3 of the field-effect transistor VT3 is simultaneously connected to the pin 2 of the field-effect transistor VT4 and the motor. The pin 3 of the field-effect transistor VT5 is simultaneously connected to the pin 2 of the field-effect transistor VT6 and the motor.
[0007] Preferably, the overcurrent detection sub-circuit includes diodes D1, a zener diode D2, diodes D3, D4, a diode D10, a comparator A1, and an isolation optocoupler OC1. The negative electrode of the diode D1 is simultaneously connected to the pin 1 and pin 2 of the zener diode D2, the pin 6 of the comparator A1, and the pin 2 of the isolation optocoupler OC1. The pin 3 of the zener diode D2 is simultaneously connected to the negative electrode of the diode D3, the positive electrode of the diode D10, the pin 1 and pin 4 of the comparator A1. The pin 2 of the zener diode D2 is simultaneously connected to the positive electrode of the diode D4 and the pin 3 of the comparator A1. The negative electrode of the diode D4 is connected to the negative electrode of the diode D10. The positive electrode of the diode D3 is simultaneously connected to the pin 2 of the zener diode D2 and the pin 2 of the comparator A1.
[0008] Preferably, the diodes D1, D3, D4, and D10 all adopt diodes of the MUR110 model, and the comparator A1 adopts a comparator of the LM311 model.
[0009] Preferably, the overcurrent protection sub-circuit includes NAND gates U1, U2, U3, U4, switch SW1, field effect transistor Q1, diode D5, light-emitting diode LED1, resistor R8, and resistor R9. The pin 1 of NAND gate U1 is connected to the pin 2 of NAND gate U2. The pin 1 of NAND gate U2 is simultaneously connected to the gate of field effect transistor Q1, the pin 2 of NAND gate U3, and the pin 2 of NAND gate U4. The pin 3 of NAND gate U2 is connected to the pin 1 of NAND gate U3. The pin 3 of NAND gate U3 is simultaneously connected to the pin 3 of NAND gate U4 and switch SW1. The pin 1 of NAND gate U4 is connected to the negative electrode of light-emitting diode LED1. The positive electrode of diode LED1 is connected to resistor R8. The drain of field effect transistor Q1 is simultaneously connected to the positive electrode of diode D5 and resistor R9. The source of field effect transistor Q1 is grounded. The negative electrode of diode D5 is connected to the other end of resistor R9.
[0010] Preferably, the NAND gates U1, U2, U3, and U4 are NAND gates of the same model, and the NAND gate of model 74HC00 is used.
[0011] Preferably, the chip U1 is a chip of model TMS320F2812DSP.
[0012] Beneficial effects: The present utility model relates to a ship variable frequency speed regulation circuit. The overcurrent detection sub-circuit is used to detect the output current of the variable frequency speed regulation sub-circuit. When the overcurrent detection sub-circuit detects that the output current of the variable frequency speed regulation sub-circuit exceeds the threshold, the overcurrent protection sub-circuit will be immediately triggered to automatically cut off the power output, preventing excessive current from damaging the inverter and the connected motor. It not only protects the integrity of the equipment, but also reduces potential safety risks. At the same time, it emits a light alarm, enhancing the safety and reliability of the system, reducing the maintenance cost, and improving the response speed and operation efficiency of the system.
[0013] When the current drops within the threshold range, the overcurrent protection sub-circuit automatically resumes the power output, enabling the ship equipment to resume normal operation and improving the operation continuity and stability of the ship system. Description of the Drawings
[0014] Figure 1 It is the circuit diagram of the variable frequency speed regulation sub-circuit of the present utility model;
[0015] Figure 2 It is the circuit diagram of the overcurrent detection sub-circuit of the present utility model;
[0016] Figure 3 It is the circuit diagram of the overcurrent protection sub-circuit of the present utility model. Detailed Embodiment
[0017] Such as Figures 1 to 3As shown in the figure, the present utility model provides a technical solution: a variable frequency speed regulation circuit for a ship, including an inverter, a variable frequency speed regulation sub-circuit, an overcurrent detection sub-circuit, and an overcurrent protection sub-circuit. The input end of the inverter is connected to an external power supply, the output end of the inverter is connected to the input end of the variable frequency speed regulation sub-circuit, the output end of the variable frequency speed regulation sub-circuit is simultaneously connected to the input end of the overcurrent detection sub-circuit and a motor. The overcurrent detection sub-circuit is used to detect the output current of the variable frequency speed regulation sub-circuit. The output end of the overcurrent detection sub-circuit is connected to chip U1. Among them, chip U1 uses a chip of the TMS320F2812DSP model. The input end of chip U1 is connected to an external power supply, the output end of chip U1 is connected to the input end of the overcurrent protection sub-circuit, and the output end of the overcurrent protection sub-circuit is connected to the input end of the inverter. The overcurrent detection sub-circuit is used to detect the output current of the variable frequency speed regulation sub-circuit. When the overcurrent detection sub-circuit detects that the output current of the variable frequency speed regulation sub-circuit exceeds the threshold, chip U1 controls the overcurrent protection sub-circuit to trigger immediately and automatically cut off the power output, preventing excessive current from damaging the inverter and the connected motor. This not only protects the integrity of the equipment but also reduces potential safety risks. At the same time, it emits a light alarm, enhancing the safety and reliability of the system, reducing maintenance costs, and improving the response speed and operation efficiency of the system. When the current drops within the threshold range, the current of the overcurrent detection sub-circuit is obtained through chip U1, and the overcurrent protection sub-circuit is controlled to automatically resume the power output, enabling the ship equipment to resume normal operation and improving the operation continuity and stability of the ship system.
[0018] In a further embodiment, as Figure 1 shown, the variable frequency speed regulation sub-circuit includes a switch S1, a diode D6, a diode D7, a diode D8, a diode D9, a capacitor C6, a field effect transistor VT1, a field effect transistor VT2, a field effect transistor VT3, a field effect transistor VT4, a field effect transistor VT5, and a field effect transistor VT6. The switch S1 is connected to the output end of the inverter. The positive electrode of the diode D6 is connected to the positive electrode of the diode D7 and is simultaneously connected to the switch S1. The negative electrode of the diode D6 is simultaneously connected to the positive electrode of the diode D8, the capacitor C6, the pin 2 of the field effect transistor VT1, the pin 2 of the field effect transistor VT3, and the pin 2 of the field effect transistor VT5. The negative electrode of the diode D7 is simultaneously connected to the negative electrode of the diode D9, the other end of the capacitor C6, the pin 3 of the field effect transistor VT2, the pin 3 of the field effect transistor VT4, and the pin 3 of the field effect transistor VT6. The negative electrode of the diode D8 is connected to the positive electrode of the diode D9. The pin 3 of the field effect transistor VT1 is simultaneously connected to the pin 2 of the field effect transistor VT2 and the motor. The pin 3 of the field effect transistor VT3 is simultaneously connected to the pin 2 of the field effect transistor VT4 and the motor. The pin 3 of the field effect transistor VT5 is simultaneously connected to the pin 2 of the field effect transistor VT6 and the motor.
[0019] In a further embodiment, asFigure 2 As shown, the overcurrent detection sub - circuit includes diode D1, zener diode D2, diode D3, diode D4, diode D10, comparator A1 and isolation optocoupler OC1. Among them, diode D1, diode D3, diode D4 and diode D10 are all diodes of model MUR110, comparator A1 is a comparator of model LM311. The negative electrode of diode D1 is simultaneously connected to pin 1 and pin 2 of zener diode D2, pin 6 of comparator A1 and pin 2 of isolation optocoupler OC1. Pin 3 of zener diode D2 is simultaneously connected to the negative electrode of diode D3, the positive electrode of diode D10, pin 1 and pin 4 of comparator A1. Pin 2 of diode D2 is simultaneously connected to the positive electrode of diode D4 and pin 3 of comparator A1. The negative electrode of diode D4 is connected to the negative electrode of diode D10. The positive electrode of diode D3 is simultaneously connected to pin 2 of zener diode D2 and pin 2 of comparator A1.
[0020] In a further embodiment, as Figure 3 shown, the overcurrent protection sub - circuit includes NAND gates U1, U2, U3, U4, switch SW1, field - effect transistor Q1, diode D5, light - emitting diode LED1, resistor R8 and resistor R9. NAND gates U1, U2, U3 and U4 are NAND gates of the same model, NAND gates of model 74HC00. Pin 1 of NAND gate U1 is connected to pin 2 of NAND gate U2. Pin 1 of NAND gate U2 is simultaneously connected to the gate of field - effect transistor Q1, pin 2 of NAND gate U3 and pin 2 of NAND gate U4. Pin 3 of NAND gate U2 is connected to pin 1 of NAND gate U3. Pin 3 of NAND gate U3 is simultaneously connected to pin 3 of NAND gate U4 and switch SW1. Pin 1 of NAND gate U4 is connected to the negative electrode of light - emitting diode LED1. The positive electrode of light - emitting diode LED1 is connected to resistor R8. The drain of field - effect transistor Q1 is simultaneously connected to the positive electrode of diode D5 and resistor R9. The source of field - effect transistor Q1 is grounded. The negative electrode of diode D5 is connected to the other end of resistor R9. When the voltages of resistors R8 and R9 in the overcurrent detection sub - circuit are higher than the threshold value, the voltage at the S2 terminal in the overcurrent detection sub - circuit is higher than the voltage at the GNDA terminal. The voltage at the inverting terminal of comparator A1 is higher than the voltage at the non - inverting terminal, and a low level is output. After isolation by isolation optocoupler OC1, a high level is output. After passing through pin 1 of NAND gate U1 and outputting a low level, through the latch formed by NAND gates U2 and U4, pin 1 of NAND gate U2 outputs a high level, and pin 1 of NAND gate U4 outputs a low level. The light - emitting diode LED1 emits light, indicating overcurrent, thereby blocking the drive signal of the inverter. Otherwise, the circuit works normally.
[0021] The preferred embodiments of the present utility model have been described in detail above. However, the present utility model is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present utility model, various equivalent transformations can be made to the technical solutions of the present utility model, and these equivalent transformations all fall within the protection scope of the present utility model.
Claims
1. A ship variable frequency speed regulation circuit, characterized in that: It includes an inverter, the input end of the inverter is connected to an external power supply, the output end of the inverter is connected to the input end of a variable frequency speed regulation subcircuit, the output end of the variable frequency speed regulation subcircuit is simultaneously connected to the input end of an overcurrent detection subcircuit and a motor, the overcurrent detection subcircuit is used to detect the output current of the variable frequency speed regulation subcircuit, the output end of the overcurrent detection subcircuit is connected to a chip U1, the input end of the chip U1 is connected to an external power supply, the output end of the chip U1 is connected to the input end of an overcurrent protection subcircuit, and the output end of the overcurrent protection subcircuit is connected to the input end of the inverter.
2. A ship variable frequency speed regulation circuit according to claim 1, characterized in that: The variable frequency speed regulation subcircuit includes a switch S1, a diode D6, a diode D7, a diode D8, a diode D9, a capacitor C6, a field effect transistor VT1, a field effect transistor VT2, a field effect transistor VT3, a field effect transistor VT4, a field effect transistor VT5 and a field effect transistor VT6. The switch S1 is connected to the output end of the inverter, the positive electrode of the diode D6 is connected to the positive electrode of the diode D7 and the switch S1 at the same time, and the negative electrode of the diode D6 is connected to the positive electrode of the diode D8, the capacitor C6, the pin 2 of the field effect transistor VT1, the pin 2 of the field effect transistor VT3 and the field effect transistor VT6 at the same time. The pin 2 of the field effect transistor VT5 is connected, the cathode of the diode D7 is connected to the cathode of the diode D9, the other end of the capacitor C6, the pin 3 of the field effect transistor VT2, the pin 3 of the field effect transistor VT4 and the pin 3 of the field effect transistor VT6, the cathode of the diode D8 is connected to the anode of the diode D9, the pin 3 of the field effect transistor VT1 is connected to the pin 2 of the field effect transistor VT2 and the motor, the pin 3 of the field effect transistor VT3 is connected to the pin 2 of the field effect transistor VT4 and the motor, and the pin 3 of the field effect transistor VT5 is connected to the pin 2 of the field effect transistor VT6 and the motor.
3. A ship variable frequency speed regulation circuit according to claim 2, characterized in that: The overcurrent detection subcircuit includes a diode D1, a voltage-stabilizing diode D2, a diode D3, a diode D4, a diode D10, a comparator A1 and an isolation optocoupler OC1. The cathode of the diode D1 is simultaneously connected to pins 1 and 2 of the voltage-stabilizing diode D2, pin 6 of the comparator A1 and pin 2 of the isolation optocoupler OC1. The pin 3 of the voltage-stabilizing diode D2 is simultaneously connected to the cathode of the diode D3, the anode of the diode D10, and pins 1 and 4 of the comparator A1. The pin 2 of the diode D2 is simultaneously connected to the anode of the diode D4 and pin 3 of the comparator A1. The cathode of the diode D4 is connected to the cathode of the diode D10. The anode of the diode D3 is simultaneously connected to pin 2 of the voltage-stabilizing diode D2 and pin 2 of the comparator A1.
4. A ship variable frequency speed regulation circuit according to claim 3, characterized in that: The diode D1 , the diode D3 , the diode D4 and the diode D10 are all MUR110 type diodes, and the comparator A1 is LM311 type comparator.
5. A ship variable frequency speed regulation circuit according to claim 1, characterized in that: The overcurrent protection subcircuit includes a NAND gate U1, a NAND gate U2, a NAND gate U3, a NAND gate U4, a switch SW1, a field effect transistor Q1, a diode D5, a light emitting diode LED1, a resistor R8 and a resistor R9, wherein the pin 1 of the NAND gate U1 is connected to the pin 2 of the NAND gate U2, the pin 1 of the NAND gate U2 is simultaneously connected to the gate of the field effect transistor Q1, the pin 2 of the NAND gate U3 and the pin 2 of the NAND gate U4, the pin 3 of the NAND gate U2 is connected to the pin 1 of the NAND gate U3, the pin 3 of the NAND gate U3 is simultaneously connected to the pin 3 of the NAND gate U4 and the switch SW1, the pin 1 of the NAND gate U4 is connected to the cathode of the light emitting diode LED1, the anode of the diode LED1 is connected to the resistor R8, the drain of the field effect transistor Q1 is simultaneously connected to the anode of the diode D5 and the resistor R9, the source of the field effect transistor Q1 is grounded, and the cathode of the diode D5 is connected to the other end of the resistor R9.
6. A ship frequency conversion speed regulation circuit according to claim 5, characterized in that: The NAND gate U1, NAND gate U2, NAND gate U3 and NAND gate U4 are NAND gates of the same type, 74HC00.
7. A ship variable frequency speed regulation circuit according to claim 1, characterized in that: The chip U1 is a TMS320F2812DSP chip.