TW202021696A - 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 present invention relates to a power supply device of an energy-saving electric discharge machine, which separates a large power power supply and a small power power supply from the power supply area, and reduces 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 engraving. 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 (Watts) (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 work rate acting on the molten workpiece is only 1250W (25V multiplied by 50A), and the overall power output will be 3250W, which is converted into reactive power by the current-limiting group. damage.

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 to improve 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 electrical discharge machine, which uses multiple power switches to control the power state, 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 the current is dispersed (50A amperes) by 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 circuit is arranged at a first node of the series circuit, and the high-power circuit 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 electric 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, the high-power power output electric energy The output power is transmitted to the processing side of the electric discharge machine through the second 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 electric energy to the processing side of the electric discharge machine after passing through the second resistor and the third power switch.

In the embodiment of the present invention, when the third power switch is activated, 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 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 of the EDM machine side, the total voltage of the low-power circuit is 65V. The second resistor is designed to be 13 ohms (65V divided by 5A). The basic power of the low-power circuit is 450W (watts). Among them, the second resistor generates 325W (65V times 5A) of heat loss. 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 mainly provided to increase the speed of insulation damage between the processing side and the workpiece during processing and increase the current climbing rate.

V除以10A)，該中功率迴路中產生290W的熱損與輸出250W(25V乘以10A)的功率，共輸出540W功率，因此，在中功率迴路可將第一電阻瓦特數之規格降低，進而達到電路成本節省的效果；在中電流模式加工時，小電流模式輸出450W加上中電流模式的540W，兩個電流模式合計產生990W功率，扣除小電流模式的加工熱能125W、扣除中電流模式的加工熱能250W有615W的功率損失，由限流電阻轉為無效熱能，相較於目前的技術975W，在中電流模式減少37%熱損，電源總輸出功率990W也比現行電路的1350W減少27%。 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, in addition to the processing current of the low current mode, it also includes slave The machining current of the medium current generated by the high-power power supply and the first resistor. In detail, the high-power power supply voltage is 54V. If the medium-power circuit outputs 10A, the main power supply area minus the machining side voltage is 29V, and then The impedance value of the first resistor must be designed to be 2.9 ohms (29

V divided by 10A), the heat loss of 290W and the output power of 250W (25V multiplied by 10A) in the middle power circuit, a total output of 540W power, therefore, the wattage specification of the first resistor can be reduced in the middle power circuit. And then achieve the effect of circuit cost saving; 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, deduct the low current mode processing heat energy of 125W, deduct the medium current mode The processing thermal energy of 250W has a power loss of 615W, which is converted from a current-limiting resistor to an ineffective thermal energy. Compared with the current technology of 975W, the heat loss in the medium current mode is reduced by 37%. The total output power of the power supply is 990W, which is also 27% less than the current circuit’s 1350W. %.

In the embodiment of the present invention, the first, second, and third power switches are activated in a large 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 circuit 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 inductor, the high-power mode generates a total of 50A current. In addition, due to the characteristics of the first inductor, the high-power circuit will not generate heat loss, only the processing power for melting the workpiece is provided; When using 50A processing mode, 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 at the very end of the circuit. 875W (35A multiplied by 25V) is generated during the period, totaling 1865W (990W+875W), after deducting the power of the molten workpiece, 1250W (50A multiplied by 25V) 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.

功率，在設計時可將元件相關規格降低，達到電路成本之節省；4.單獨使用小電流模式加工時可降低電路上的離散電容，改善放電電極的消耗。 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, 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 supply

Power, the relevant specifications of the components can be reduced during the design, and the cost of the circuit can be reduced; 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 unit

(6)‧‧‧Electric discharge machine

"this invention"

(2)‧‧‧Main power supply 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 the use 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 further understanding and recognition of the features and characteristics of the present invention, the following preferred embodiments are enumerated and illustrated as follows:

Please refer to Figure 2, the power supply device of the energy-saving electrical discharge machine of the present invention mainly includes: a main power supply area (2), a high power circuit (3), a medium power circuit (4) and a low power circuit ( 5) constituted.

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), and 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 electric 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 loop (5) is pulled up by the low-power power supply (22) as an independent circuit, and the low-power loop (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 supply (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 following will introduce the characteristics of each current mode one by one. For the convenience of description, the following 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 low 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 low power loop (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 machining 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) produces 325W (65V times 5A) heat loss, the processing side (61) voltage is 25V current 5A, the actual processing heat energy is 125W (25V times 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 activated, and the first power switch (32) is turned off, it is a medium current mode; in this state, except for the processing current of the low current mode , It also includes 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, in the medium power circuit (4), the first resistor (41) wattage 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 processing heat energy of the low current mode 125W, Excluding 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 the 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 of the main power supply area (2) The power supply (22) outputs electric 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, due to the characteristics of the first inductance (31), the high-power circuit (3) will not produce heat loss, only providing 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, because 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 4500W.

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

1. Reduce the total power of the power supply, and reduce the thermal loss of the current-limiting resistor by reducing the resistance 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.

4. The reduced power supply specification 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 power consumption.

To sum up, 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 it needs to be clarified, the above is the technical principle 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 supply 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, which 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 to generate power to an electrical discharge machine Processing side; the aforementioned mid-power loop is arranged 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 second resistor and the second power switch transmit the output power to the processing side of the electric 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 electric 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 processing side of the electrical discharge machine. According to the power supply device of the energy-saving electric discharge machine described in item 2 of the scope of patent application, the Turn on the third power switch of the low-power loop, turn off the first power switch of the high-power loop and the second power switch of the middle-power loop. In the case of a low-current mode, the low-power loop 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 electric discharge machine, 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 electrical discharge machine according to the second item of the patent application, 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, 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 in the middle current mode processing, the low current mode output 450W plus the middle current mode 540W, the two current modes total 990W Power, 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 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 loop 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 middle 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 coupled with the first inductor to provide a processing current of 35A. Processing current, the high power Mode generates a total of 50A current; when using 50A processing in high current mode, the low power loop provides 5A current 450W power, the medium power loop provides 10A current 540W power, and the high power loop uses 35A current. 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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