A portable permanent magnet switch drive module with overcurrent protection and charging management

Abstract

The present invention provides a portable permanent magnet switch driving module with overcurrent protection and charging management, belonging to the field of driving of switch equipment in the power industry. The present invention includes a CPU, a closing and short-circuit protection driving module and a power supply module respectively connected to the CPU, a bridge circuit driven by the closing and short-circuit protection driving module, and a short-circuit protection module arranged on the bridge circuit and connected to the CPU. The short-circuit protection module is used to judge whether the circuit is short-circuited according to the load size before the load is connected to work. The beneficial effect of the present invention is that it can detect whether the coil side is short-circuited in time and effectively prevent the internal circuit from being damaged due to short-circuit.

Description

Technical Field

[0001] The present invention relates to the drive of switchgear in the power industry, and particularly to a portable permanent magnet switch drive module with overcurrent protection and charging management. Background Art

[0002] When an existing permanent magnet switch is actually used, it cannot rely on traditional mechanical tools for closing operation, but must rely on a permanent magnet switch drive module for driving. When the on-site switch is actually out of power for maintenance or inspection before commissioning, since there is no power supply introduced, the drive module supporting the switch cannot be directly used. Therefore, a portable permanent magnet drive module with battery power supply is required for operation. The existing permanent magnet drive modules are not only large in size and extremely heavy, making them inconvenient to carry, but also extremely prone to short circuit on the coil side and damage under harsh on-site operating environments.

[0003] Therefore, the above mode has the following disadvantages:

[0004] 1. The module is not only large in size but also bulky.

[0005] 2. When the coil side is short-circuited, it is very easy to burn out the internal circuit.

[0006] 3. The operating voltage cannot be adjusted.

[0007] 4. Charging requires a dedicated AC220V plug.

[0008] 5. After the internal circuit is damaged, it cannot be self-checked and found in time. Summary of the Invention

[0009] To solve the problems in the prior art, the present invention provides a portable permanent magnet switch drive module with overcurrent protection and charging management.

[0010] The present invention includes a CPU, a closing and short-circuit protection drive module and a power module respectively connected to the CPU, a bridge circuit driven by the closing and short-circuit protection drive module, and a short-circuit protection module arranged on the bridge circuit and connected to the CPU. The short-circuit protection module is used to judge whether the circuit is short-circuited according to the load size before the load is connected to work.

[0011] For further improvement of the present invention, the closing and short-circuit protection driving module includes three driving units with the same structure. The first driving unit includes a triode Q3, the primary side of an optocoupler OP3 and its peripheral resistors and capacitors. Among them, the base of the triode Q3 is connected to the control pin PB3 of the CPU through a resistor R37. The two ends of the resistor R37 are also respectively connected to the other end of a grounding capacitor C20 and a grounding resistor R38. The collector of the triode Q3 is respectively connected to one end of a resistor R36 and the primary side pin 2 of the optocoupler OP3. The primary side pin 1 of the optocoupler OP3 is connected to the power supply through a resistor R28. The other end of the resistor R36 is connected to the power supply. The emitter of the triode Q4 is grounded.

[0012] For further improvement of the present invention, the bridge circuit and short-circuit protection module includes three optocoupler secondary sides with the same structure respectively connected to the three driving units. The secondary side pin 4 of the optocoupler OP3 is connected to the positive pole of the power supply, and the secondary side pin 3 outputs. It also includes a triac T1, a triac T5, a triode Q1 and a sampling unit. The triac T5 is connected in parallel with the sampling unit and then respectively connected to the triac T1 and the triode Q1 arranged at both ends of the load to control the conduction of the load. The control electrodes of the triac T1 and the triac T5 and the base of the triode Q1 are respectively connected to the pin 3 of the three optocoupler secondary sides.

[0013] For further improvement of the present invention, when an export is required, the closing and short-circuit protection driving module drives the bridge circuit and short-circuit protection module to open before the export, conducts the triac T1 and the triode Q1. The sampling unit collects the voltage. The CPU judges the load size through the collected voltage. If the load is less than the specified value, it is judged that the external coil is short-circuited, and the subsequent export will be immediately aborted. If the load size meets the requirements, it controls the conduction of the triac T1, the triac T5 and the triode Q1 for normal export.

[0014] For further improvement of the present invention, the power supply module includes a charge and discharge management module connected to the CPU and a battery connected to the charge and discharge management module. The number of the batteries is several. The positive pole of each battery is connected to the 5V power supply, the negative pole is grounded, and a relay is respectively connected in series. During charging, the relay is disconnected and each battery is charged in parallel. During discharging, the relay is closed and the batteries are connected in series to supply power to the whole module.

[0015] For further improvement of the present invention, the portable permanent magnet switch driving module further includes a USB charging port and a voltage acquisition module arranged at the charging port.

[0016] For further improvement of the present invention, it further includes an energy storage module, and the energy storage module supplies power to the bridge circuit and the short-circuit protection module.

[0017] For further improvement of the present invention, it further includes a voltage regulation module for regulating the voltage of the energy storage module.

[0018] For further improvement of the present invention, the voltage regulation module includes optocouplers OP4, OP5, OP6, triodes Q2, Q3, Q4, and their peripheral resistors. Among them, the primary pins 1 of the optocouplers OP4, OP5, OP6 are respectively connected to different input / output pins of the CPU through a resistor, and are also respectively grounded through a resistor. The primary pin 2 of the optocouplers OP4, OP5, OP6 is grounded. The secondary pin 4 of the optocouplers OP4, OP5, OP6 is connected to the input power supply. The secondary pin 3 of the optocoupler OP4 is connected to the base of the triode Q2 through the resistor R70. The collector of the triode Q2 is connected to one end of the resistor R13. The secondary pin 3 of the optocoupler OP5 is connected to the base of the triode Q3 through the resistor R43. The collector of the triode Q3 is connected to one end of the resistor R17 through the resistor R16. The secondary pin 3 of the optocoupler OP6 is connected to the base of the triode Q4 through the resistor R88. The collector of the triode Q4 is connected to one end of the resistor R21 through the resistor R20. A resistor is respectively connected in series between the base and the emitter of the triodes Q2, Q3, Q4. The emitters of the triodes Q2, Q3, Q4 are respectively connected to the negative pole of the power supply. The other ends of the resistors R13, R17, and R21 are connected together and output the regulated voltage.

[0019] For further improvement of the present invention, it further includes an LCD liquid crystal display connected to the CPU, an LED indicator light connected to the output end of the CPU, and several switch buttons connected to the input end of the CPU.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: pre-closing self-check can detect whether the coil side is short-circuited in a timely manner, effectively preventing damage caused by short-circuit in the internal circuit; small in size, convenient for on-site debuggers to carry; simple charging method, using the same interface as electronic products such as mobile phones for charging; voltage adjustable, and the closing operation can be achieved by adjusting the voltage when the switch cannot be closed. Description of the Drawings

[0021] Figure 1 It is the structural block diagram of the present invention;

[0022] Figure 2 It is the circuit schematic diagram of the present invention;

[0023] Figures 3 - 6 is Figure 2 a partial enlarged view, where Figure 3 is the circuit schematic diagram of the switch button; Figure 4 is the circuit schematic diagram of the bridge circuit and the short-circuit protection module; Figure 5 is the circuit schematic diagram of the power supply module; Figure 6 is the circuit schematic diagram of the voltage regulation module;

[0024] Figure 7This is the circuit schematic diagram of the LCD liquid crystal display module. Specific embodiments

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] As Figure 1 shown, the present invention includes a CPU, a closing and short-circuit protection driving module respectively connected to the CPU, a power supply module, a bridge circuit driven by the closing and short-circuit protection driving module, and a short-circuit protection module disposed on the bridge circuit and connected to the CPU. The short-circuit protection module is used to determine whether the circuit is short-circuited according to the load size before the load is connected to work.

[0027] In this example, the power supply module includes a charge and discharge management module connected to the CPU and a lithium battery connected to the charge and discharge management module. The lithium battery provides working power and stores energy in the energy storage module. The energy storage module supplies power to the bridge circuit and the short-circuit protection module. This example also includes a voltage regulation module for regulating the voltage of the energy storage module. The voltage can be adjusted, and the closing operation can be achieved by adjusting the voltage when the switch cannot be closed. The battery charging port of this example is preferably a USB charging port, and a voltage acquisition module connected to the CPU is also provided at the USB charging port. Using the general MICROUSB port solution, any USB device around, including mobile phone chargers, laptop computers, USB sockets, etc., can charge the product, eliminating the need to worry about chargers.

[0028] This example also includes an LCD liquid crystal display screen connected to the CPU, an LED indicator light connected to the output end of the CPU, and several switch buttons connected to the input end of the CPU.

[0029] As Figure 2 and Figure 3 shown, the switch buttons of this example include a 12*12 preset button K6 and a 12*12 closing button K5, and also include 4 switch buttons K1-K4. Among them, one end of the preset button K6 and the closing button K5 are respectively connected to the power supply and the CPU control pin, and the other end is connected to the power supply ground. One end of the switch buttons K1-K4 is connected to the CPU control pin, and the other end is connected to the power supply ground. As Figure 7 shown, the CPU of this example is connected to the liquid crystal display screen through the interface JP7.

[0030] As Figure 2As shown, the closing and short-circuit protection driving module in this example includes three driving units with the same structure. The first driving unit includes a triode Q3, the primary side of an optocoupler OP3, and its peripheral resistors and capacitors. Among them, the base of the triode Q3 is connected to the control pin PB3 of the CPU through a resistor R37. The two ends of the resistor R37 are also respectively connected to the other end of the grounding capacitor C20 and the grounding resistor R38. The collector of the triode Q3 is respectively connected to one end of a resistor R36 and the primary side pin 2 of the optocoupler OP3. The primary side pin 1 of the optocoupler OP3 is connected to the power supply through a resistor R28. The other end of the resistor R36 is connected to the power supply. The emitter of the triode Q4 is grounded.

[0031] As Figure 2 and Figure 4 shown, the bridge circuit and short-circuit protection module includes three optocoupler secondary sides with the same structure respectively connected to the three driving units. The secondary side pin 4 of the optocoupler OP3 is connected to the positive power supply, and the secondary side pin 3 outputs. It also includes a triac T1, a triac T5, a triode Q1, and a sampling unit. The triac T5 and the sampling unit are connected in parallel and then respectively connected to the triac T1 and the triode Q1 that are arranged at both ends of the load and control the conduction of the load. The control electrodes of the triac T1 and the triac T5 and the base of the triode Q1 are respectively connected to the pin 3 of the three optocoupler secondary sides.

[0032] When an export is required, the closing and short-circuit protection driving module drives the bridge circuit and short-circuit protection module to open before the export, conducts the triac T1 and the triode Q1. At this time, the sampling unit samples the voltage on the voltage-dividing resistor R0 composed of the resistors R93 and R26 (AIN_ZL4 pin). The size of the load can be calculated through the sampled voltage. The CPU judges the size of the load through the sampled voltage. If the load is less than the specified value, it is judged that the external coil is short-circuited, and the subsequent export will be immediately aborted. If the size of the load meets the requirements, it controls the conduction of the triac T1, the triac T5, and the triode Q1 for normal export.

[0033] The special feature of the present invention is that it can judge the situation of the load in advance, calculate the size of the load through a similar pre-operation, and lock the operation if the load does not meet the requirements. The calculation of the load size is as follows:

[0034] U0 is the voltage sampled on the sampling resistor R0, that is, the voltage of AIN_ZL4;

[0035] where U is the capacitor voltage providing energy, that is, the value of DC_Vcap, and R is the load. The size of the R value determines the size of the load, and R1 is the combination of the resistor R20 and the resistor R25.

[0036] Through pre - closing self - inspection, the present invention can timely detect whether there is a short - circuit on the coil side, effectively prevent damage to the internal circuit caused by short - circuit, and greatly improve the safety of the entire drive.

[0037] As Figure 2 and Figure 5 shown, in this example, the power supply is composed of multiple independent 4.2V lithium batteries. During charging, through circuit design, it becomes a parallel mode, while during discharging operation, it becomes a series mode to supply 25.2V power to the whole machine. In this way, there is no need to add a large and expensive AC - DC charging module, and it can be charged with ordinary 5V, with a small volume and being convenient for on - site debugging personnel to carry.

[0038] Specifically, the positive electrode of each lithium battery is connected to a 5V power supply, the negative electrode is grounded, and an isolation diode is set at both the positive and negative electrodes. In addition, a relay is connected in series between each single - cell lithium battery. When charging, the relay is disconnected, and each battery is charged separately. After charging is completed, the switch is turned off; when in use, the battery is started to work through a preset key, the relay is closed, and the batteries are connected in series to obtain the required 24V or 48V voltage.

[0039] As Figure 2 and Figure 6 shown, in this example, the voltage - regulating module includes optocouplers OP4, OP5, OP6, triodes Q2, Q3, Q4, and their peripheral resistors. Among them, the primary pins 1 of the optocouplers OP4, OP5, OP6 are respectively connected to different input - output pins of the CPU through a resistor and are also respectively grounded through a resistor. The primary pins 2 of the optocouplers OP4, OP5, OP6 are grounded. The secondary pins 4 of the optocouplers OP4, OP5, OP6 are connected to the input power supply. The secondary pin 3 of the optocoupler OP4 is connected to the base of the triode Q2 through the resistor R70. The collector of the triode Q2 is connected to one end of the resistor R13. The secondary pin 3 of the optocoupler OP5 is connected to the base of the triode Q3 through the resistor R43. The collector of the triode Q3 is connected to one end of the resistor R16 through the resistor R17. The secondary pin 3 of the optocoupler OP6 is connected to the base of the triode Q4 through the resistor R88. The collector of the triode Q4 is connected to one end of the resistor R20 through the resistor R21. A resistor is respectively connected in series between the bases and emitters of the triodes Q2, Q3, Q4. The emitters of the triodes Q2, Q3, Q4 are respectively connected to the negative pole of the power supply. The other ends of the resistors R13, R17, and R21 are connected together and output the regulated voltage. The voltage can be adjusted, and when the switch cannot be closed, the closing operation can be achieved by adjusting the voltage.

[0040] The characteristic of the present invention when starting the closing operation is an instantaneous large current, so overcurrent cannot be well tested. In addition, if the overcurrent test scheme is inappropriate, it will cause misoperation of on-site equipment. Moreover, if the overcurrent design is unreasonable, it will also affect the action time of on-site primary equipment. In addition, the instantaneous large current is likely to cause damage to the internal circuit of the whole machine. The present invention effectively avoids the damage of overcurrent to the equipment through pre-closing detection, and can reach the ms level without affecting the action time of the equipment.

[0041] The charging management scheme of this example does not require the setting of an AC socket and an AC-DC conversion structure, enabling the whole set of equipment to charge common civilian low-voltage equipment in high-voltage occasions in the power industry. While effectively reducing the area of the whole machine, it greatly improves the convenience of use.

[0042] The specific embodiments described above are the preferred embodiments of the present invention, and do not limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific embodiment. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A portable permanent magnet switch drive module with overcurrent protection and charging management, characterized in that: It includes a CPU, a closing and short-circuit protection driving module respectively connected to the CPU, a power supply module, a bridge circuit driven by the closing and short-circuit protection driving module, and a short-circuit protection module arranged on the bridge circuit and connected to the CPU. The short-circuit protection module is used to judge whether the circuit is short-circuited according to the load size before the load is connected to work. The closing and short-circuit protection driving module includes three driving units with the same structure. The first driving unit includes a triode Q4, the primary side of an optocoupler OP2 and its peripheral resistors and capacitors. Among them, the base of the triode Q4 is connected to the control pin PB10 of the CPU through a resistor R37. The two ends of the resistor R37 are also respectively connected to the other end of the grounding capacitor C20 and the grounding resistor R38. The collector of the triode Q4 is respectively connected to one end of a resistor R36 and the primary side pin 2 of the optocoupler OP2. The primary side pin 1 of the optocoupler OP2 is connected to the power supply through a resistor R11. The other end of the resistor R36 is connected to the power supply. The emitter of the triode Q4 is grounded. The bridge circuit and the short-circuit protection module include three optocoupler secondary sides respectively connected to the three driving units. The secondary side pin 4 of the optocoupler OP2 is connected to the positive power supply, and the secondary side pin 3 outputs. It also includes a triac T1, a triac T5, a triode Q1 and a sampling unit. The triac T5 is connected in parallel with the sampling unit and then respectively connected to the triac T1 and the triode Q1 arranged at both ends of the load to control the conduction of the load. The control electrodes of the triac T1 and the triac T5 and the base of the triode Q1 are respectively connected to the pin 3 of the three optocoupler secondary sides. When an export is required, the closing and short-circuit protection driving module drives the bridge circuit and the short-circuit protection module to open before the export, conducts the triac T1 and the triode Q1, and the sampling unit collects the voltage. The CPU judges the load size through the collected voltage. If the load is less than the specified value, it is judged that the external coil is short-circuited, and the subsequent export will be immediately aborted. If the load size meets the requirements, it controls the conduction of the triac T1, the triac T5, and the triode Q1 for normal export.

2. The portable permanent magnet switch driving module according to claim 1, wherein: The power supply module includes a charge and discharge management module connected to the CPU and a battery connected to the charge and discharge management module. The number of the batteries is several. The positive electrode of each battery is connected to the 5V power supply, the negative electrode is grounded, and a relay is respectively connected in series. During charging, the relay is disconnected, and each battery is charged in parallel. During discharging, the relay is closed, and the batteries are connected in series to supply power to the whole module.

3. The portable permanent magnet switch driving module according to claim 2, wherein: The portable permanent magnet switch driving module further includes a USB charging port and a voltage acquisition module arranged at the charging port.

4. The portable permanent magnet switch driving module according to any one of claims 1-3, characterized in that: It further includes an energy storage module, and the energy storage module supplies power to the bridge circuit and the short-circuit protection module.

5. The portable permanent magnet switch driving module according to claim 4, wherein: It further includes a voltage regulation module for regulating the voltage of the energy storage module.

6. The portable permanent magnet switch driving module according to claim 5, wherein: The voltage regulation module includes optocouplers OP4, OP5, OP6, triodes Q2, Q3, Q4, and their peripheral resistors. Among them, the primary pins 1 of the optocouplers OP4, OP5, OP6 are respectively connected to different input / output pins of the CPU through a resistor, and are also respectively grounded through a resistor. The primary pins 2 of the optocouplers OP4, OP5, OP6 are grounded. The secondary pin 4 of the optocouplers OP4, OP5, OP6 is connected to the input power supply. The secondary pin 3 of the optocoupler OP4 is connected to the base of the triode Q2 through the resistor R70. The collector of the triode Q2 is connected to one end of the resistor R13. The secondary pin 3 of the optocoupler OP5 is connected to the base of the triode Q3 through the resistor R43. The collector of the triode Q3 is connected to one end of the resistor R17 through the resistor R16. The secondary pin 3 of the optocoupler OP6 is connected to the base of the triode Q4 through the resistor R88. The collector of the triode Q4 is connected to one end of the resistor R21 through the resistor R20. A resistor is respectively connected in series between the base and the emitter of the triodes Q2, Q3, Q4. The emitters of the triodes Q2, Q3, Q4 are respectively connected to the negative power supply. The other ends of the resistors R13, R17, and R21 are connected together and output the regulated voltage.

7. The portable permanent magnet switch driving module according to any one of claims 1-3, characterized in that: It further includes an LCD liquid crystal display connected to the CPU, an LED indicator light connected to the output end of the CPU, and several switch buttons connected to the input end of the CPU.

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