TWI708647B - The power supply device of an energy-saving discharge machine - Google Patents

Abstract

The power supply device of an energy-saving discharge machine comprises a main power supply zone, which has a serial circuit between a high power power supply and a small power supply, and furthermore, the main power supply area is connected with a high power loop, a medium power circuit and a small power loop according to the processing demand to open thepower switch of the high-power circuit, or the power switch on thepower circuit, or the power switch of the small power circuit canproduce the corresponding large, medium and small currentoutput mode, according to which the power supply specifications are reduced to achieve energy saving and reduce the powerconsumption of the device.

Description

Power supply device of energy-saving electric discharge machine

The invention relates to a power supply device for an energy-saving electrical discharge machine, which separates the power supply area from a high-power power supply and a small-power power supply to reduce the power of the power supply to achieve energy saving and power consumption reduction devices.

As shown in Figure 1, the electric discharge machine (6) converts electrical energy into heat energy, and then uses the heat energy to melt the workpiece to achieve the purpose of carving mold processing. The power supply device (11) of the existing electric discharge machine (6) adopts a single power source. To provide circuit energy, the power consumption of the power supply device (11) mainly lies in the heat loss of the current-limiting resistor and the heat energy between the electrode workpieces, and its advantages are simple design and easy control of processing current.

The disadvantage of the power supply device (11) of the current electric discharge machine (6) is that the output current structure relies on a single power supply device (11), resulting in high power consumption for the power supply to provide the overall circuit.

As shown in Figure 1, the instantaneous power is to control the output cycle of the power supply so that the power supply can instantly output 50A current. The calculation of power P is based on the mathematical expression shown below: P=IV=I ² R(P: power, I: current ( Ampere), R: resistance (ohm), V: voltage)

The calculation of resistance R is based on the mathematical expression shown below:

As shown in Figure 1, when the electric discharge machine (6) is started, the power is 4500W (watt) (90V, 50A) operation. The voltage between the electrodes and the workpiece after the insulation is broken is about 25V as the calculated value. The actual power acting on the molten workpiece is only 1250W (25V multiplied by 50A), and the overall power output will have 3250W heat loss from the current-limiting electric group converted into reactive power .

Therefore, how to solve the problems and deficiencies of the above-mentioned conventional knowledge is a topic that the related industry urgently wants to develop.

The main purpose of the present invention is to provide an energy-saving electric discharge machine power supply device. Since the processing speed of the electric discharge machine depends on the magnitude and frequency of the current flowing between the electrode and the workpiece after the insulation between the electrode and the workpiece is broken, the invention The circuit for improving the current output mode after insulation breakdown is the basic structure. The power supply device is disassembled into a high-power power supply and a low-power power supply. The high-power power supply outputs high voltage and large current, and the low-power power supply outputs low voltage and small current, namely The power supply capacity can be reduced and the heat loss of the current limiting resistor can be reduced to achieve the advantages of energy saving and cost reduction.

The second purpose of the present invention is to provide a power supply device for an energy-saving electric discharge machine, which uses multiple power switches to control the power state, and provides three processing modes with large, medium, and small currents, especially for trimming (mirror) processing. Precision and yield.

For this reason, the present invention uses the following technical means to achieve the above-mentioned purpose of the invention: a main power supply area, which can define a high-power power supply and a low-power power supply, the high-power power supply provides high voltage (54V volts), the low power The power supply provides low voltage (36V volts) and distributes the current (50A amperes) with a current dispersion design. Furthermore, the high-power power supply and the low-power power supply are connected in series through a series circuit; the aforementioned main power supply area is connected to a large Power loop, a medium power loop and a small power loop; The aforementioned high-power loop is arranged at a first node of the series circuit, and the high-power loop includes a first power switch that passes the output electric energy through a first inductor and the first power switch to generate power to an electrical discharge machine The processing side; the aforementioned mid-power loop is set at a second node of the series circuit, the mid-power loop includes a first resistor, a second power switch, the second power switch is turned on by the high-power power output electric energy The output power is transmitted to the processing side of the electric discharge machine through the first resistor and the second power switch; the aforementioned low-power circuit is pulled up by the low-power power supply to an independent circuit, and the low-power circuit includes a second resistor A third power switch. After the third power switch is turned on, the low-power power source transmits electrical energy to the processing side of the electrical discharge machine after passing through the second resistor and the third power switch.

In the embodiment of the present invention, the third power switch is turned on, and the first and second power switches are turned off. It is a low current mode; at this time, the circuit output is controlled according to the maximum current output of the small power loop of 5A. After the high-power power supply is connected in series with the low-power power supply, a high voltage of 90V is generated. After subtracting the inter-electrode voltage of 25V after the insulation breakdown on the machining side of the electric discharge machine, the total voltage of the low-power circuit is 65V. The second resistor is designed to be 13 ohms (65V divided by 5A), and the basic power of the low-power circuit is 450W (watts). Among them, the second resistor generates 325W (65V multiplied by 5A) heat loss, and the voltage on the processing side is 25V The current is 5A, and the actual processing heat energy is 125W (25V multiplied by 5A). Therefore, in the low current mode, high voltage can be provided to increase the speed of insulation damage between the processing side and the workpiece during processing and increase the current climbing rate.

In the embodiment of the present invention, when the second and third power switches are activated, and the first power switch is turned off, it is a medium current mode; in this state, except for a low current mode In addition to the processing current, it also includes the processing current of the medium current generated from the high-power power supply and the first resistor. In detail, the high-power power supply voltage is 54V. If the medium power loop outputs 10A current, the main power supply area is reduced The voltage on the processing side is 29V, and the impedance of the first resistor must be designed to be 2.9 ohms (29V divided by 10A). The heat loss of 290W and the output power of 250W (25V multiplied by 10A) in the middle power loop are total Output 540W power, therefore, in the medium power loop, the specification of the first resistance wattage can be reduced, thereby achieving the effect of circuit cost saving; in the medium current mode processing, the low current mode output 450W plus the medium current mode 540W, two A total of 990W power generated by the two current modes. After deducting the processing heat energy of 125W in the low current mode and deducting the processing heat energy of 250W in the medium current mode, there is a power loss of 615W. The current limiting resistor is converted to invalid heat energy. The current mode reduces heat loss by 37%, and the total output power of the power supply is 990W, which is also 27% less than the 1350W of the current circuit.

In the embodiment of the present invention, the first, second, and third power switches are activated in a high current mode; in this state, the high-power and low-power power supplies in the main power supply area output electrical energy at the same time, and the low-power loop passes through the low-power power supply The high-power power supply in series with the second resistor and the third power switch generates a small current of 5A processing current. The medium-power loop is provided by the high-power power supply, the second power switch and the first resistor to provide a processing current of 10A. The first power switch is In addition to the 35A processing current provided by the first inductance, the high-power mode generates a total of 50A current. In addition, due to the characteristics of the first inductance, the high-power circuit will not produce heat loss, only the processing power for melting the workpiece is provided; When the mode uses 50A processing, the low-power circuit provides 5A current of 450W power, the medium power circuit provides 10A current of 540W power, and the high-power circuit uses 35A current. Because the first inductor is an energy storage element that does not generate heat loss, it is 875W (35A multiplied by 25V), a total of 1865W (990W+875W), deducting the power of the molten workpiece is 1250W (50A multiplied by 25V), which is 615W Power loss, this part is converted from current-limiting resistor into invalid heat energy, which is 81% less heat loss than the current circuit's 3250W, and the total power is 58% less than the conventional circuit's 4500W.

Through the above description and the conventional technology in Figure 1, the present invention has the following advantages: 1. The present invention reduces the total power of the power supply, reduces the heat loss of the current limiting resistor, and has the effect of energy saving; 2. The present invention can reduce the power supply The specifications can reduce the power consumption at the maximum instantaneous output current, and the power consumption is reduced from 4500W to 1865W at most, saving about 58% of the power consumption; 3. The present invention reduces the total power of the power supply and can reduce the relevant specifications of the components during design to achieve Saving of the circuit cost; 4. When the small current mode is used alone, the discrete capacitance on the circuit can be reduced and the consumption of the discharge electrode can be improved.

"Traditional Technology"

(11): Power supply device

(6): Electric discharge machine

"this invention"

(2): Main power area

(21): High-power power supply

(22): Small power supply

(23): Series circuit

(231): First node

(232): second node

(3): High power circuit

(31): The first inductor

(32): First power switch

(4): Medium power circuit

(41): First resistor

(42): Second power switch

(5): Small power circuit

(51): Second resistor

(52): Third power switch

(6): Electric discharge machine

(61): Processing side

Figure 1 is the circuit diagram of a conventional electric discharge machine.

Figure 2 is a schematic diagram of the structure of the present invention.

Figure 3 is a state diagram of the low current mode of the present invention.

Figure 4 is a state diagram of the current mode in the present invention.

Figure 5 is a state diagram of the high current mode of the present invention.

In order to enable your reviewer to have a better understanding and recognition of the features and characteristics of the present invention, the following preferred embodiments are listed and illustrated in conjunction with the drawings as follows: Please refer to Figure 2, the power source of the energy-saving electrical discharge machine of the present invention The device mainly includes: a main power area (2), a high-power loop (3), a medium-power loop (4) and a small-power loop (5).

As shown in Figure 2, the main power supply area (2) can define a high-power power supply (21) and A low-power power supply (22), the high-power power supply (21) provides a high voltage (54V (volt)), the low-power power supply (22) provides a low voltage (36V (volt)), and the high-power power supply (21) ) And the low-power power supply (22) are connected in series through a series circuit (23).

As shown in Figure 2, the aforementioned high-power loop (3) is arranged at a first node (231) of the series circuit (23). The high-power loop (3) includes a first inductor (31), a The first power switch (32), after the first power switch (32) is turned on, the high-power power supply (21) outputs electrical energy through the first inductor (31) and the first power switch (32) to generate power To the processing side (61) of an electric discharge machine (6).

As shown in Figure 2, the aforementioned mid-power loop (4) is arranged at a second node (232) of the series circuit (23), and the mid-power loop (4) includes a first resistor (41) and a second node (232). Two power switches (42). After turning on the second power switch (42), the high-power power supply (21) outputs electrical energy through the first resistor (41) and the second power switch (42) to transmit the output power to the The processing side (61) of the electric discharge machine (6); the medium power circuit (4) can cooperate with the electric energy of the high-power power supply (21) to generate medium current for processing.

As shown in Figure 2, the aforementioned low-power circuit (5) is pulled up by the low-power power supply (22) as an independent circuit, and the low-power circuit (5) includes a second resistor (51) and a third power supply. Switch (52), after turning on the third power switch (52), the low-power power source (22) transmits electric energy to the electric discharge machine (22) after passing through the second resistor (51) and the third power switch (52). 6) The processing side (61).

Since the present invention is provided with a high-power loop (3), a medium-power loop (4), and a low-power loop (5), three different current modes can be generated. The characteristics of each current mode will be introduced below for the convenience of description. The voltage data is only an example and is not limited to this. The voltage and current can be adjusted according to customized requirements.

As shown in Figures 2 and 3, turn on the third power switch (52), turn off the first and In the case of the second power switch (32, 42), it is a small current mode. For the convenience of explanation, the parts that are not used are covered to avoid difficulty in interpretation; at this time, the overall circuit output is based on the small power circuit (5) output maximum current of 5A Restriction control, the high-power power supply (21) and the low-power power supply (22) are connected in series to generate a high voltage of 90V, minus the inter-electrode voltage after the insulation breakdown of the processing side (61) of the electric discharge machine (6) After 25V, the total voltage of the low-power circuit (5) is 65V, and the aforementioned second resistor (51) is designed to be 13 ohms (65V divided by 5A). The basic power of the low-power circuit (5) is 450W (watts). ), where the second resistor (51) generates 325W (65V multiplied by 5A) heat loss, the processing side (61) voltage is 25V current 5A, the actual processing heat energy is 125W (25V multiplied by 5A), therefore, In the low current mode, high voltage can be mainly provided to increase the speed of insulation breakdown between the processing side (61) and the workpiece during processing and increase the current climbing rate.

As shown in Figure 4, when the second and third power switches 42, 52 are turned on, and the first power switch (32) is turned off, it is in a medium current mode; in this state, except for the processing current of the low current mode , It also contains the medium current processing current generated from the high-power power supply (21) and the first resistor (41). In detail, the high-power power supply (21) has a voltage of 54V, and the medium power loop (4) is set to The output current is 10A, the voltage of the high-power power supply (21) is 54V minus the processing side voltage is 29V, and the impedance value of the first resistor (41) must be designed to be 2.9 ohms (29V divided by 10A). 4) The heat loss of 290W (29V multiplied by 10A) and the output power of 250W (25V multiplied by 10A) are 540W in total. Therefore, the first resistor (41) can be used in the mid-power circuit (4). The specifications are reduced to achieve the effect of circuit cost savings; in the medium current mode processing, the low current mode output 450W plus the medium current mode 540W, the two current modes produce a total of 990W power, deducting the low current mode processing heat energy of 125W, After deducting the processing heat energy of 250W in the medium current mode, there is a power loss of 615W, which is converted from the current limiting resistor to invalid heat energy. Compared with the current technology of 975W, the heat is reduced by 37% in the medium current mode. The total output power of the power supply is 990W, which is 27% less than the current circuit’s 1350W.

As shown in Figure 5, the first, second, and third power switches (32, 42, 52) are activated in a high-current mode; in this state, the high-power power (21) and low-power in the main power area (2) The power supply (22) outputs electrical energy at the same time, and the low-power circuit (5) generates a small current 5A processing current through the low-power power supply (22) in series with the high-power power supply (21), the second resistor (51) and the third power switch (52) , The middle power circuit (4) is provided with a processing current of 10A by the high-power power supply (21), the second power switch (42), and the first resistor (41). The first power switch (32) is coupled with the first inductor (31) Provide a processing current of 35A. In the high current mode, the overall circuit generates a total current of 50A. In addition, the characteristics of the first inductor (31) make the high-power circuit (3) not generate heat loss, and only provide The processing power of the molten workpiece; when using 50A processing in the high current mode, the low power circuit (5) provides 5A current 450W power, the medium power circuit (4) provides 10A current 540W power, and the high power circuit (3) uses 35A current. The first inductor (31) is an energy storage element without heat loss, so 875W (35A multiplied by 25V) is generated between the poles of the circuit, totaling: 1865W (990W+875W), deducting the power of the molten workpiece is 1250W (50A multiplied by At 25V), there is a power loss of 615W. This part is converted from a current-limiting resistor into ineffective heat, which is 81% less heat loss than the current circuit's 3250W, and the total power is 58% less than the conventional circuit's 4500W.

Through the above description, the present invention has the following advantages:

1. Reduce the total power of the power supply, because it reduces the resistance of the current-limiting resistor and thereby reduces the heat loss of the current-limiting resistor, which has the effect of "energy saving".

2. Due to the reduction of the total power of the power supply, the relevant specifications of the components can be reduced during the design, and the circuit cost can be saved.

3. It can reduce the stray capacitance on the circuit and improve the consumption of the discharge electrode when the small current mode is used alone for processing.

4. The reduced power supply specifications can reduce the power consumption at the maximum instantaneous output current. The power consumption can be reduced from 4500W to 1865W at most, saving about 58% of the power consumption.

In summary, the structure of the present invention has never been seen in books and periodicals or used publicly, and sincerely meets the requirements of an invention patent application. I sincerely ask Jun Bureau to approve the patent as soon as possible.

If you need to clarify, the above are the technical principles immediately used in the implementation of the present invention. If the changes made according to the concept of the present invention, the functions produced by it still do not exceed the spirit covered by the specification and drawings, All should be within the scope of the present invention, and should be disclosed.

"this invention"

(2): Main power area

(21): High-power power supply

(22): Small power supply

(23): Series circuit

(231): First node

(232): second node

(3): High power circuit

(31): The first inductor

(32): First power switch

(4): Medium power circuit

(41): First resistor

(42): Second power switch

(5): Small power circuit

(51): Second resistor

(52): Third power switch

(6): Electric discharge machine

(61): Processing side

Claims (5)

An energy-saving electric discharge machine power supply device mainly includes: a main power supply area, which can define a high-power power supply and a low-power power supply, the high-power power supply provides high voltage, the low-power power supply provides low voltage, and Disperse the current with a distributed current design. Furthermore, the high-power power supply and the low-power power supply are connected in series through a series circuit; the aforementioned main power supply area is connected with a high-power loop, a medium-power loop, and a low-power loop; The high-power loop is set at a first node of the series circuit, and the high-power loop includes a first power switch that passes the output power through a first inductor, and the first power switch generates power to an electrical discharge machine Processing side; the aforementioned mid-power loop is set at a second node of the series circuit, the mid-power loop includes a first resistor, a second power switch, the second power switch is turned on by the high-power power output power through The first resistor and the second power switch transmit the output power to the processing side of the electrical discharge machine; the aforementioned low-power circuit is pulled up by the low-power power supply to an independent circuit, and the low-power circuit includes a second resistor, A third power switch. After the third power switch is turned on, the low-power power source transmits electric energy to the processing side of the electrical discharge machine after passing through the second resistor and the third power switch. According to the power supply device of the energy-saving electric discharge machine described in the first item of the scope of patent application, the voltage of the high-power power supply is 54V (Volt), the voltage of the low-power power supply is 36V (Volt), and the current is set at 50A ( Ampere), so that the high-power circuit, the medium-power circuit, and the low-power circuit generate different current patterns to process the machining side of the electrical discharge machine. According to the power supply device of the energy-saving electrical discharge machine described in item 2 of the scope of patent application, the When the third power switch of the low-power circuit is turned off, the first power switch of the high-power circuit and the second power switch of the medium-power circuit are turned off. It is a low-current mode. The low-power circuit outputs a maximum current of 5A. Control, after the high-power power supply and the low-power power supply are connected in series, a high voltage of 90V is generated after subtracting the inter-electrode voltage of 25V after the insulation breakdown on the machining side of the EDM, the total voltage of the low-power circuit is 65V. The second resistor is designed to be 13 ohms, the second resistor generates 325W of heat loss, the voltage on the processing side is 25V and the current is 5A, and the actual processing heat energy is 125W. According to the power supply device of the energy-saving electric discharge machine according to the second item of the scope of patent application, wherein the second power switch of the middle power circuit and the third power switch of the low power circuit are activated, and the first power supply of the high power circuit is turned off The switch state is a medium current mode; the high-power power supply voltage is 54V, the medium power loop outputs 10A current, the main power supply area minus the processing side voltage is 29V, and the aforementioned first resistance is 2.9 ohms , The heat loss of 290W and output power of 250W in the middle power loop, a total output of 540W power, and when processing in the middle current mode, the low current mode output 450W plus the middle current mode 540W, the two current modes produce a total of 990W Power, after deducting 125W of processing heat energy in low current mode and 250W of processing heat energy in medium current mode, there is a power loss of 615W. The current limiting resistor is converted to ineffective heat to reduce heat loss and reduce the overall output power. According to the power supply device of the energy-saving electric discharge machine according to the second item of the scope of patent application, the first power switch of the high-power circuit, the second power switch of the middle power circuit, and the third power switch of the low-power circuit are activated It is a high current mode; in this state, the aforementioned high-power power supply and the aforementioned low-power power supply output electric energy at the same time, and the low-power circuit connects the high-power power supply with the second resistor and the third power switch through the low-power power supply in series Generate a small current of 5A processing current, the mid-power loop is provided by the high-power power supply, the second power switch, and the first resistor to provide a processing current of 10A. The first power switch adds the first inductor to provide 35A. Processing current, the high current Mode generates a total current of 50A; when using 50A processing in high current mode, the low power loop provides 5A current 450W power, the middle power loop provides 10A current 540W power, the high power loop uses 35A current, so in the high power loop 875W is generated between the poles, totaling 1865W. After deducting the power of the melted workpiece, 1250W, there is a power loss of 615W. This part of the current-limiting resistor is converted to ineffective heat, which reduces the overall output power.

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