CN203219278U - A solar cell ion implanter level conversion circuit - Google Patents

Abstract

The utility model discloses an Electric level converting circuit for a solar energy cell ion implantor; the circuit comprises a signal connecting seat and a high speed optical coupler; a first and a third interfaces of the signal connecting seat are respectively connected with a first input terminal and a third input terminal of the high speed optical coupler; a second interface and a fourth interface of the signal connecting seat are respectively connected with a second input terminal and a fourth input terminal of the high speed optical coupler; a fifth interface of the signal connecting seat is connected with the a first output terminal and a fourth output terminal of the high speed optical coupler; a sixth interface and a seventh interface of the signal connecting seat are respectively connected with a second output terminal and a third output terminal of the high speed optical coupler; an eighth interface of the signal connecting seat is connected with the first and the fourth output terminals of the high speed optical coupler; and the first output terminal of the high speed optical coupler is connected with the fourth output terminal of the high speed optical coupler through a filter capacitor. The electric level converting circuit for the solar energy cell ion implantor solves a problem that a motor control panel cannot directly communicate with a digit input panel.

Description

A solar cell ion implanter level conversion circuit

technical field

The utility model relates to the field of solar photovoltaics, in particular to a level conversion circuit for an ion implantation machine for solar cells. the

Background technique

In the solar cell production process, the diffusion process is one of the very important processes. Considering the unpredictability and uncontrollability of PN junction diffusion in the diffusion process of the original diffusion furnace, the ion implantation of the solar cell ion implanter Dose accuracy, so the use of ion implanters for PN junction diffusion can increase solar conversion efficiency, reduce etching and other process steps, and improve production efficiency.

The solar cell ion implanter "sticks" the cell to the target platform through electrostatic attraction, and moves up and down with the target platform, and the ion beam is evenly injected into the cell horizontally. When the wide beam current is uniform and constant within the injection time , the accuracy of the injection dose is related to the time when the target table moves up and down, so the motor of the target table’s up and down movement must be precisely controlled. The accuracy of the motor movement is related to the code. The driver control board we choose can output a set code and compare it with the actual code. The pulse value, that is, the position comparison value (Position compare) pulse, the pulse value is 5VTTL level mode, but the digital input board NI9426 (DI board) is a 24V source digital input module, so the position comparison value output by the motor control board ( Position compare) pulses cannot be directly output to the digital input board NI9426 (DI board), and a level conversion interface board is required to be compatible with these two level logics. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a solar cell ion implanter level conversion circuit to solve the problem that the motor control board cannot directly communicate with the digital input board.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a solar cell ion implanter level conversion circuit, including a signal connection seat and a high-speed optocoupler, the first interface and the third interface of the signal connection seat respectively connected to the first input end and the third input end of the high-speed optocoupler; the second interface and the fourth interface of the signal connection seat are respectively connected to the second input end and the fourth input end of the high-speed optocoupler ; The fifth interface of the signal connection seat is connected to the first output end and the fourth output end of the high-speed optocoupler; the sixth interface and the seventh interface of the signal connection seat are respectively connected to the first output end of the high-speed optocoupler The second output terminal and the third output terminal are connected; the eighth interface of the signal connection seat is connected with the first output terminal and the fourth output terminal of the high-speed optocoupler; the first output terminal of the high-speed optocoupler is filtered The capacitor is connected to the fourth output terminal of the high-speed optocoupler.

As a preferred solution, between the first interface of the signal connection seat and the first input end of the high-speed optocoupler, between the third interface of the signal connection seat and the third input end of the high-speed optocoupler, the signal connection Between the fifth interface of the seat and the first output end and the fourth output end of the high-speed optocoupler, between the sixth interface of the signal connection seat and the second output end of the high-speed optocoupler, the signal connection seat A current-limiting resistor is respectively connected between the seventh interface of the high-speed optocoupler and the third output terminal of the high-speed optocoupler.

Compared with the prior art, the utility model has the beneficial effects that: the high-speed optocoupler of the utility model can convert the TTL level signal output by the motor control board to the 24V source digital input board after the electro-optical-electric conversion. Carrying out communication solves the problem that the motor control board cannot directly communicate with the digital input board.

Description of drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the utility model;

Fig. 2 is an application schematic diagram of an embodiment of the present invention.

Detailed ways

As shown in Figure 1, an embodiment of the utility model includes a signal connection seat J1 and a high-speed optocoupler HCPL2531. The first input end and the third input end of the high-speed optocoupler; the second interface and the fourth interface of the signal connection seat J1 are respectively connected with the second input end and the fourth input end of the high-speed optocoupler; The fifth interface of the signal connection seat is connected to the first output terminal and the fourth output terminal of the high-speed optocoupler through a current limiting resistor R5; the sixth interface and the seventh interface of the signal connection seat J1 are each connected through a current limiting Resistors R3 and R4 are respectively connected to the second output end and the third output end of the high-speed optocoupler; the eighth interface of the signal connector J1 is connected to the first output end and the fourth output end of the high-speed optocoupler ; The first output end of the high-speed optocoupler is connected to the fourth output end of the high-speed optocoupler through a filter capacitor C1.

HCPL2531 is a dual-channel high-speed optocoupler, and the transmission delay between its output and input is nS level. Since the input and output of the optocoupler are transmitted through optical signals, the two parts are completely isolated electrically, and there is no power. Signal feedback and interference, so the performance is stable and the anti-interference ability is strong. In addition, the coupling capacitance between the light-emitting tube and the photosensitive tube of the optocoupler is small (about 2pF), and the withstand voltage is high (about 2.5kV), so the common-mode rejection ratio is very high. high.

In Figure 1, the input terminal I ₀ + of the high-speed optocoupler HCPL2531 is at low level, and when there is a driving current flowing in the light-emitting diode, the photosensitive diode at the output terminal will be turned on by light, and the base of the NPN transistor will generate a driving current. It is turned on, so the collector O ₀ of the triode is converted from high level to low level, the size of the base terminal drive current is related to the luminous intensity of the light-emitting diode, and the output signal of the optocoupler is nS level relative to the input delay, HCPL2531 The output delay is 500nS, which belongs to high-speed optocoupler and meets the needs of high-speed transmission.

In Figure 2, the position comparison signal POSITION COMPARE of the motor control board NI9514 is a high-speed output pulse. COMPARE outputs a TTL level pulse with a minimum of 100nS, so that the input light-emitting diode of the high-speed optocoupler HCPL2531 is turned on, the light-emitting diode emits light, and the photosensitive diode is turned on by light to generate a driving current to drive the triode to turn on.

In the digital input board NI9426, the input signal DI1 is connected to the collector of the output transistor of the high-speed optocoupler HCPL2531. The output triode is turned on, and the purpose of signal control is achieved by changing the level of the triode. After the host computer and uniformity controller of the solar cell ion implanter collect the changed signal, they can judge the scanning motor and the uniformity controller. Move the Faraday motor in place.

The five current-limiting resistors R1-R5 are respectively connected to the input and output of the high-speed optocoupler, which can play a protective role when the motor control board NI9514 and the digital input board NI9426 (DI board) are short-circuited.

The high-speed optocoupler HCPL2531 has two electrical-optical-electrical isolation circuits. The input circuit of each circuit can be connected to a TTL level signal. After passing the photoelectric isolation, the output can be connected to a 24V circuit.

For the input and output circuits, it is not limited to TTL level and 24V level circuits, but also for other level (preferably ≤24VDC) circuits, signal transmission and isolation can also be carried out. the

Claims (3)

1. A solar cell sheet ion implanter level conversion circuit, comprising a signal connection seat and a high-speed optocoupler, characterized in that the first interface and the third interface of the signal connection seat are respectively connected to the first interface of the high-speed optocoupler An input terminal and a third input terminal; the second interface and the fourth interface of the signal connection seat are respectively connected to the second input terminal and the fourth input terminal of the high-speed optocoupler; the fifth interface of the signal connection seat Connected to the first output end and the fourth output end of the high-speed optocoupler; the sixth interface and the seventh interface of the signal connection seat are respectively connected to the second output end and the third output end of the high-speed optocoupler; The eighth interface of the signal connection seat is connected to the first output end and the fourth output end of the high-speed optocoupler; the first output end of the high-speed optocoupler is connected to the fourth output end of the high-speed optocoupler through a filter capacitor. output connection. 2. The level conversion circuit of the ion implanter for solar cells according to claim 1, characterized in that, the model of the high-speed optocoupler is HCPL2531. 3. The solar cell ion implanter level conversion circuit according to claim 1, characterized in that, between the first interface of the signal connection seat and the first input end of the high-speed optocoupler, the second port of the signal connection seat Between the third interface and the third input end of the high-speed optocoupler, between the fifth interface of the signal connection seat and the first output end and the fourth output end of the high-speed optocoupler, and the sixth interface of the signal connection seat A current-limiting resistor is respectively connected between the second output terminal of the high-speed optocoupler and between the seventh interface of the signal connection seat and the third output terminal of the high-speed optocoupler.

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