CN201463912U - Wire-saving type optical encoder based on programmable logic device - Google Patents

Abstract

The utility model relates to a wire-saving type optical encoder based on a programmable logic device, and belongs to the field of signal transmission of a photoelectric encoder. A processing circuit of the wire-saving type optical encoder comprises a programmable logic device and an output device, wherein the input terminal of the programmable logic device is connected with signal output terminals (U, V, W, A, B and Z), multiplexing output terminals (UA, VB and WZ) are connected with an input terminal of the output device, and an output terminal of the output device is connected with an output line for users to use. Since fewer devices are employed, space is saved, and at the same time, the speed and the stability for data transmission are also enhanced. The programmable logic avoids the problem of interference caused by plenty of devices, the volume is small, the programmable logic device realizes the required function mainly through a hardware circuit by way of on-line programming; therefore, the wire-saving type optical encoder is superior to the traditional microprocessor in terms of speed and reliability.

Description

Province's line optics scrambler based on programmable logic device (PLD)

Technical field

The utility model relates to the photoelectric encoder field of signal transmissions, relates generally to a kind of photoelectric encoder with U, V, W signal.Reduced signal wire quantity, and the output signal of energy fast and stable.

Background technology

Photoelectric encoder is to represent a kind of sensor of the positional information of the rotor that links to each other with photoelectric encoder by reading pattern on the photoelectric coded disk or coded message.It all is being widely used aspect various measurement occasions and the Electric Machine Control to count accurate, highly sensitive advantage.Photoelectric encoder can be divided into absolute optical encoder and incremental optical-electricity encoder according to principle of work.

Incremental optical-electricity encoder is the sensor that a kind of photoelectricity transformation principle converts the geometry of machinery displacement on the output shaft to impulse form.Its common output signal has U+, U-, V+, V-, W+, W-, A+, A-, B+, B-, Z+, Z-and power lead and ground wire, wherein U, V, W are motor rotor position of magnetic pole signal, A, B, Z are the rotor CRANK PULSES, each signal all is to occur in pairs, 14 transmission lines altogether, this just makes producer will spend bigger one-tenth and made scrambler originally and used cable between the equipment of scrambler, and the user uses cumbersome, the mistake that also occurs wrong weldering, leakage weldering easily, and the wrong difficulty of investigation.And in these 14 lines, U, V, W signal are mainly used in the motor rotor position of magnetic pole are provided, therefore, U, V, W signal only supply to get final product in the motor starting prerequisite usually, after motor ran well, U, V, W promptly were in idle state, and this has just caused the waste of transmission line deployment cost.

The domestic disclosed patent about the wire saving type scrambler has device strap circuits such as taking timer and selector switch to reach the purpose that reduces output signal line at present, and design the time is not easy to change parameter, the also difficult control of the factors such as interference that device brings more.

Summary of the invention

The utility model provides a kind of province's line optics scrambler based on programmable logic device (PLD), and is many to solve the conventional codec signal wire, the problem that operating difficulties is easily made mistakes.The technical scheme that the utility model is taked is: its treatment circuit mainly comprises:

Programmable logic device (PLD): receive motor rotor position of magnetic pole signal and the rotor CRANK PULSES gathered, and signal is carried out time-division processing, output device is exported in the timesharing of realization signal;

Output device: receive the output of programmable logic device (PLD), output U+, U-, V+, V-, W+, W-, A+, A-, B+, B-, Z+, Z-signal;

The input end of programmable logic device (PLD) is connected with U, V, W, A, B, Z signal output part, and multiplexing output terminal UA, VB, WZ are connected with the input end of output device, and the output terminal of output device connects the output line that uses for the user.

A kind of embodiment of the utility model is that output device adopts line drive.

The utility model programmable logic device (PLD) realizes time-division processing to motor rotor position of magnetic pole signal and rotor CRANK PULSES by the online burning program, and output is to the control signal of output device.

Output device is exported the output signal of programmable logic device (PLD) by the form serial of difference.

When system powers on, after resetting, programmable logic device (PLD) starts working, at first the motor rotor position of magnetic pole signal that collects is input to programmable logic device (PLD), in order to judge the motor running direction, programmable logic device (PLD) is determined output mode, input signal is handled, export motor rotor position of magnetic pole signal then, be that U, V, W signal and control signal are given output device, driver is able to along magnetic direction running motor, and this moment, the output device output signal was U+, U-, V+, V-, W+, W-signal; Programmable logic device (PLD) changes output mode then, and beginning output rotor CRANK PULSES is A, B, Z signal on the output signal line of U, V, W signal under first output mode, and this moment, the output device output signal was A+, A-, B+, B-, Z+, Z-signal.

The utility model adopts the higher programmable logic device (PLD) of speed to realize the time-division processing of U, V, W signal and A, B, Z signal, U, V, W signal and A, B, signal wire of Z signal multiplexing are exported, reduced the use of signal transmssion line, reduced the cost of stube cable, used device is less, save the space, also improved the speed and the stability of transmission data simultaneously.And programmable logic device (PLD) has avoided device how to cause the problem of interference easily, volume is little, and programmable logic device (PLD) mainly is the method realization required function of hardware circuit by online burning, so it is more superior than traditional microprocessor aspect reliability in speed.

Description of drawings

Fig. 1 is a schematic diagram of the present utility model.

Embodiment

Its treatment circuit mainly comprises:

Programmable logic device (PLD) 1: receive motor rotor position of magnetic pole signal and the rotor CRANK PULSES gathered, and signal is carried out time-division processing, output device is exported in the timesharing of realization signal;

Output device 2: receive the output of programmable logic device (PLD), output U+, U-, V+, V-, W+, W-, A+, A-, B+, B-, Z+, Z-signal;

The input end of programmable logic device (PLD) is connected with U, V, W, A, B, Z signal output part, and multiplexing output terminal UA, VB, WZ are connected with the input end of output device, and the output terminal of output device connects the output line that uses for the user.

A kind of embodiment of the utility model is that output device adopts line drive.

As shown in Figure 1, U, V, W, A, B, Z are motor rotor position of magnetic pole signal and the rotor CRANK PULSES that collects.U, V, W, A, B, Z signal input part are connected with FPGA (Field Programmable Gate Array) respectively, and multiplexing output terminal is UA, VB, WZ, and the output device control end is G, and UA+, UA-, VB+, VB-, WZ+, WZ-are the differential output signal of output device.The multiplexing output terminal UA of programmable logic device (PLD), VB, WZ are connected to output device: the multiplexing input end of line drive, the multiplexing output terminal UA+ of line drive, UA-, VB+, VB-, WZ+, WZ-directly connect output line, connect voluntarily according to demand for the user.Programmable logic device (PLD) is at first selected first output mode after powering on and stablizing, and in this stage motor rotor position of magnetic pole signal is handled output then, and what exported this moment is U, V, W signal, exports U+, U-, V+, V-, W+, W-through output device.According to predefined program, programmable logic device (PLD) will change output mode afterwards, and the output rotor CRANK PULSES is A, B, Z signal, through output device output A+, A-, B+, B-, Z+, Z-.Here the shared signal line of U and A, the shared signal line of V and B, the shared signal line of W and Z.Therefore it significantly reduced the use of signal wire through the same shared signal line of the output behind the output device, also just reduced wrong weldering, leaked the phenomenon of welding, and the transmission speed of programmable logic device (PLD) is fast, the data stability good reliability.

Claims (2)

1. province's line optics scrambler based on programmable logic device (PLD), it is characterized in that: its treatment circuit mainly comprises:

Programmable logic device (PLD): receive motor rotor position of magnetic pole signal and the rotor CRANK PULSES gathered, and signal is carried out time-division processing, output device is exported in the timesharing of realization signal;

Output device: receive the output of programmable logic device (PLD), output U+, U-, V+, V-, W+, W-, A+, A-, B+, B-, Z+, Z-signal;

The input end of programmable logic device (PLD) is connected with U, V, W, A, B, Z signal output part, and multiplexing output terminal UA, VB, WZ are connected with the input end of output device, and the output terminal of output device connects the output line that uses for the user.

2. a kind of province's line optics scrambler based on programmable logic device (PLD) according to claim 1 is characterized in that: output device adopts line drive.

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