Bidirectional pulse amplitude period independent adjustable electroplating power supply

Abstract

The utility model discloses a bidirectional pulse amplitude period independent adjustable electroplating power supply, which is characterized in that an AC power supply is connected with a positive power supply generating circuit and a negative power supply generating circuit, the positive power supply generating circuit and the negative power supply generating circuit are respectively connected to a chopper circuit, and the chopper circuit is also connected with a driving circuit. The positive power generation circuit and the negative power generation circuit are identical in structure and circuit element, the first rectification filter is connected with the inverter circuit, the inverter circuit is connected with the second rectification filter, the second rectification filter is connected with the current sampling resistor, the current sampling resistor is connected with the filter circuit, and the filter circuit is connected with the chopper circuit. The current and voltage sampling circuit is connected with the current sampling resistor, the filter circuit, the first controller and the PWM generation circuit, the first controller is connected with the PWM generation circuit, the PWM generation circuit is connected with the H-bridge driving circuit, and the H-bridge driving circuit is connected with the inverter circuit. And the requirements of independent and adjustable positive and negative pulse amplitudes and independent and adjustable periods of electroplating are met. Moreover, when the peak voltage or current is reached, no overshoot and no ringing exist, and the pulse current is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply control, in particular to a bidirectional electroplating power supply with independently adjustable pulse amplitude and period. Background Art

[0002] With the continuous development of electroplating technology, the requirements for electroplating power supplies are increasing, especially for the precious metal electroplating industry. Due to the high cost of precious metals, improving the quality of the coating and saving the amount of precious metals have become common requirements of the industry. During the DC electroplating process, the metal positive ions in the electrolyte are reduced to metals by electrons on the cathode where the plated part is located, and are deposited on the cathode surface to form a coating. This reduces the concentration of metal positive ions in the electrolyte near the cathode, thereby slowing down the speed of electrodeposition. Introducing a large and short negative pulse after the positive pulse can strongly dissolve and flatten the convex parts of the coating, and increase the ion concentration of the coating near the cathode, preparing for the next electroplating process. However, the positive and negative pulse amplitudes of the existing positive and negative pulse electroplating power supplies are the same, the cycle cannot be adjusted independently, or the pulse peak is unstable, which makes it difficult to meet the requirements of precious metal electroplating power supplies. Summary of the invention

[0003] The purpose of the utility model is to provide a bidirectional pulse amplitude and period independently adjustable electroplating power supply. To achieve the above purpose, the utility model adopts the following technical solutions:

[0004] A bidirectional pulse amplitude and period independently adjustable electroplating power supply, characterized in that an AC power supply is connected to a positive power generation circuit and a negative power generation circuit, the positive power generation circuit and the negative power generation circuit are respectively connected to a chopper circuit, the positive power generation circuit and the negative power generation circuit both include a first rectifier filter, an inverter circuit, a second rectifier filter, a current sampling resistor, a current and voltage sampling circuit, a filter circuit, a first controller, a PWM generation circuit, and an H-bridge drive circuit, the chopper circuit is also connected to a drive circuit, and the drive circuit is also connected to a second controller. The output voltage or current amplitude of the positive power generation circuit and the negative power generation circuit are independently adjusted, and a flat wave voltage with different amplitudes can be output after the filter circuit. Under the control of the second controller, the chopper circuit outputs a pulse voltage or current with positive and negative pulse amplitudes and different periods through the drive circuit.

[0005] Furthermore, the second controller is electrically connected to the first controllers of the positive power generation circuit and the negative power generation circuit via RS485, and the communication addresses of the two first controllers are different.

[0006] Furthermore, the chopper circuit outputs a pulse voltage or current, and the positive and negative pulse amplitudes and periods of the pulse voltage or current are different.

[0007] Furthermore, the data communication between the second controller and the first controller of the positive power generation circuit and the negative power generation circuit includes positive and negative power supply working modes, setting the positive and negative power supply voltage and current, sampling the real-time voltage and current of the positive and negative power supplies, etc.

[0008] Furthermore, the first controller controls a separate PWM generation circuit according to the received set voltage or current. In the PWM generation circuit, the set voltage or current is compared with the collected voltage or current to generate a PWM pulse output, and finally the output voltage after the filter circuit or the current on the current sampling resistor is the same as the set value. The set voltage or current of the positive power generation circuit is different from the set voltage or current of the negative power generation circuit, and the pulse amplitude presented to the chopper circuit output is different.

[0009] Furthermore, the second controller is electrically connected to the drive circuit and also electrically connected to the human-machine interface. The human-machine interface is used to set the positive and negative power supply peak voltage and current, the positive and negative power supply on time and off time, the number of positive and negative power supply pulses, the communication address and other data.

[0010] Furthermore, the AC power supply is AC220V or AC380V, and is electrically connected to the first rectifier filter of the positive power generation circuit and the negative power generation circuit. The output of the first rectifier filter is electrically connected to the inverter circuit, and the output of the inverter circuit is electrically connected to the second rectifier filter. The output of the second rectifier filter is electrically connected to the current sampling resistor, and the current sampling resistor is electrically connected to the filter circuit.

[0011] Furthermore, the inverter circuit is also electrically connected to the H-bridge drive circuit, the H-bridge drive circuit is also electrically connected to the PWM generation circuit, the PWM generation circuit is also electrically connected to the first controller and the current and voltage sampling circuit. The current and voltage sampling circuits are electrically connected to the current sampling resistor and are also electrically connected to the positive and negative electrodes of the filter circuit output.

[0012] Further, the positive pole of the filter circuit output of the positive power generation circuit is electrically connected to IN1+ of the chopper circuit, and the negative pole is electrically connected to IN1- of the chopper circuit. The positive pole of the filter circuit output of the negative power generation circuit is electrically connected to IN2+ of the chopper circuit, and the negative pole is electrically connected to IN2- of the chopper circuit.

[0013] Further, the chopper circuit IN1+ is electrically connected to the D end of the MOSFET tube Q1, one end of the resistor R1, and the anode of the diode D1. The other end of the resistor R1 is electrically connected to the cathode of the diode D1, and then electrically connected to one end of the capacitor C1. The other end of the capacitor C1 is electrically connected to the S end of Q1. The S end of Q1 is also connected to the left end of the load RL, the D end of the MOSFET tube Q2, one end of the resistor R2, and the positive electrode of the diode D2. The other end of the resistor R2 is also electrically connected to the cathode of the diode D2 and one end of the capacitor C2. The other end of the capacitor C2 is also connected to the S end of Q2 and the negative electrode IN2- output of the filter circuit of the negative power supply generation circuit. The chopper circuit IN2+ is electrically connected to the D end of the MOSFET tube Q3, one end of the resistor R3, and the anode of the diode D3. The other end of the resistor R3 is electrically connected to the cathode of the diode D3, and then electrically connected to one end of the capacitor C3. The other end of the capacitor C3 is electrically connected to the S end of Q3. The S end of Q3 is also connected to the right end of the load RL, the D end of the MOSFET tube Q4, one end of the resistor R4, and the positive electrode of the diode D4. The other end of the resistor R4 is also electrically connected to the cathode of the diode D4 and one end of the capacitor C4. The other end of the capacitor C4 is also connected to the S end of Q4 and the negative electrode IN1- of the filter circuit output of the negative power generation circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a bidirectional electroplating power supply with independently adjustable pulse amplitude and period

[0015] Figure 2 Chopper Circuit Diagram

[0016] Figure 3 Bidirectional pulse amplitude and period independently adjustable electroplating power supply output waveform DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] like Figure 1 As shown, the bidirectional pulse amplitude period independently adjustable electroplating power supply of this embodiment mainly includes a positive power generation circuit, a negative power generation circuit, a second controller, a drive circuit and a chopper circuit. The positive power generation circuit and the negative power generation circuit structure and circuit elements all include a first rectifier filter, an inverter circuit, a second rectifier filter, a current sampling resistor, a current and voltage sampling circuit, a filter circuit, a first controller, a PWM generation circuit, and an H-bridge drive circuit.

[0019] The second controller is electrically connected to the first controller of the positive power generation circuit and the negative power generation circuit via RS485, and the communication addresses of the two first controllers are different, generally set to 1 and 2. The data communication between the second controller and the first controller of the positive power generation circuit and the negative power generation circuit includes the working mode of the positive and negative power generation circuits, setting the positive and negative power supply voltage and current, sampling the real-time voltage and current of the positive and negative power supplies, etc.

[0020] There are two working modes of the positive and negative power generation circuits, voltage stabilization mode and current stabilization mode. The positive and negative power generation circuits must work in the same way, and they must be in voltage stabilization mode or current stabilization mode at the same time.

[0021] The first controller controls a separate PWM generation circuit according to the received set voltage or current. In the PWM generation circuit, the set voltage or current is compared with the collected voltage or current to generate a PWM pulse output, and finally the output voltage after the filter circuit or the current on the current sampling resistor is the same as the set value. The set voltage or current of the positive power generation circuit is different from the set voltage or current of the negative power generation circuit, and the pulse amplitude presented to the chopper circuit output is different.

[0022] The second controller is electrically connected to the drive circuit and also electrically connected to the human-machine interface. The human-machine interface is used to set the positive and negative power supply peak voltage and current, the positive and negative power supply on time and off time, the positive and negative power supply pulse number, the communication address and other data.

[0023] The AC power supply is AC220V or AC380V, and is electrically connected to the first rectifier filter of the positive power generation circuit and the negative power generation circuit. The output of the first rectifier filter is electrically connected to the inverter circuit, and the output of the inverter circuit is electrically connected to the second rectifier filter. The output of the second rectifier filter is electrically connected to the current sampling resistor, and the current sampling resistor is electrically connected to the filter circuit.

[0024] The inverter circuit is also electrically connected to the H-bridge drive circuit, which is also electrically connected to the PWM generation circuit, which is also electrically connected to the first controller and the current and voltage sampling circuit. The current and voltage sampling circuit is electrically connected to the current sampling resistor and is also electrically connected to the positive and negative electrodes of the filter circuit output.

[0025] like Figure 2 The chopper circuit 14 is composed of four MOS tubes Q1, Q2, Q3 and Q4. The positive electrode of the filter circuit output of the positive power generation circuit is electrically connected to IN1+ of the chopper circuit, and the negative electrode is electrically connected to IN1- of the chopper circuit. The positive electrode of the filter circuit output of the negative power generation circuit is electrically connected to IN2+ of the chopper circuit, and the negative electrode is electrically connected to IN2- of the chopper circuit.

[0026] When Q1, Q2, Q3, and Q4 are all turned off, the output is 0V level. When Q2 and Q3 are turned off and Q1 and Q4 are turned on, a positive pulse is output, and the pulse peak voltage is the flat wave voltage output by the positive power generation circuit. When Q1 and Q4 are turned off and Q2 and Q3 are turned on, a negative pulse is output, and the pulse peak voltage is the flat wave voltage output by the negative power generation circuit.

[0027] The width of the positive and negative pulses is controlled by the second controller, such as Figure 3 As shown in the figure, when Q2 and Q3 are turned off, the time when Q1 and Q4 are turned on is t1, and when Q2 and Q3 are turned off, the time when Q1 and Q4 are turned off is t2. Keep Q2 and Q3 off, Q1 and Q4 are turned on for 3 consecutive times of t1, and turned off for t2, then 3 positive pulses are output continuously. Keep Q1 and Q4 off, Q2 and Q3 are turned on for 2 consecutive times of t3, and turned off for t4, then 2 negative pulses are output continuously. t0 is the period of the pulse group.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional pulse amplitude and period independently adjustable electroplating power supply, characterized in that: The AC power supply is connected to a positive power generation circuit and a negative power generation circuit, and the positive power generation circuit and the negative power generation circuit are respectively connected to a chopper circuit. The positive power generation circuit and the negative power generation circuit both include a first rectifier filter, an inverter circuit, a second rectifier filter, a current sampling resistor, a current and voltage sampling circuit, a filter circuit, a first controller, a PWM generation circuit, and an H-bridge drive circuit. The chopper circuit is also connected to a drive circuit, and the drive circuit is also connected to a second controller.

2. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1, characterized in that: The second controller is electrically connected to the first controllers of the positive power generation circuit and the negative power generation circuit via RS485. The communication addresses of the two first controllers are different. The second controller reads the working modes, real-time voltage and current of the two first controllers, and sets the positive and negative power supply voltage and current.

3. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1 is characterized in that The chopper circuit is connected to a load RL and outputs a pulse voltage or current, and the positive and negative pulse amplitudes and periods of the pulse voltage or current are different.

4. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1, characterized in that: The second controller is electrically connected to the drive circuit and also to the human-machine interface, which is used to set the positive and negative power supply peak voltage and current, the positive and negative power supply on time and off time, as well as the positive and negative power supply pulse number and communication address.

5. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1, characterized in that: The AC power supply is AC220V or AC380V, and is electrically connected to the first rectifier filter of the positive power generation circuit and the negative power generation circuit. The first rectifier filter is also electrically connected to the inverter circuit, the inverter circuit is electrically connected to the second rectifier filter, the second rectifier filter is electrically connected to the current sampling resistor, and the current sampling resistor is electrically connected to the filter circuit.

6. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1, characterized in that: The inverter circuit is also electrically connected to the H-bridge drive circuit, the H-bridge drive circuit is also electrically connected to the PWM generation circuit, the PWM generation circuit is also electrically connected to the first controller and the current and voltage sampling circuit, the current and voltage sampling circuit is electrically connected to the current sampling resistor, and is also electrically connected to the positive and negative poles of the filter circuit output.

7. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 4, characterized in that: The positive pole of the filter circuit output of the positive power supply generating circuit is electrically connected to IN1+ of the chopper circuit, and the negative pole is electrically connected to IN1- of the chopper circuit. The positive pole of the filter circuit output of the negative power supply generating circuit is electrically connected to IN2+ of the chopper circuit, and the negative pole is electrically connected to IN2- of the chopper circuit.

8. The bidirectional pulse amplitude and period independently adjustable electroplating power supply as claimed in claim 1, characterized in that: The chopper circuit IN1+ is electrically connected to the D end of the MOSFET tube Q1, one end of the resistor R1, and the anode of the diode D1. The other end of the resistor R1 is electrically connected to the cathode of the diode D1, and then electrically connected to one end of the capacitor C1. The other end of the capacitor C1 is electrically connected to the S end of Q1. The S end of Q1 is also connected to the left end of the load RL, the D end of the MOSFET tube Q2, one end of the resistor R2, and the positive electrode of the diode D2. The other end of the resistor R2 is also electrically connected to the cathode of the diode D2 and one end of the capacitor C2. The other end of the capacitor C2 is also connected to the S end of Q2 and the negative electrode IN2- of the filter circuit output of the negative power supply generating circuit. The chopper circuit IN2+ is electrically connected to the D end of the MOSFET tube Q3, one end of the resistor R3, and the anode of the diode D3. The other end of the resistor R3 is electrically connected to the cathode of the diode D3, and then electrically connected to one end of the capacitor C3. The other end of the capacitor C3 is electrically connected to the S end of Q3. The S end of Q3 is also connected to the right end of the load RL, the D end of the MOSFET tube Q4, one end of the resistor R4, and the positive electrode of the diode D4. The other end of the resistor R4 is also electrically connected to the cathode of the diode D4 and one end of the capacitor C4. The other end of the capacitor C4 is also connected to the S end of Q4 and the negative electrode IN1- of the output of the filter circuit of the negative power supply generating circuit.

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