TLC5615 based multi-channel adjustable CNC DC regulated power supply, 51 single chip microcomputer, including proteus simulation and C code

The design requirements

1. 5V Single power supply operation ;
2. The voltage output range is the reference input voltage 2 times , The adjustment range of this design is ：0V~3.9V;
3. The voltage adjustment accuracy is up to 0.02%;
4. Two voltage regulation methods ： Automatic mode and manual mode ;
5. 3 Circuit voltage output channel , And can be controlled separately ;
6. When the voltage exceeds the set range , automatic alarm ;

TLC5615 brief introduction
TLC5615 Is a reference input with buffer （ High impedance ） Of 10 Bit voltage output digital - Analog converter (DAC),DAC It has an output voltage range of twice the reference voltage , And DAC It's monotonous . The device is simple to use , Use single 5V Power operation .

Reference voltage VREFIN = VCC * [ R8/(R7+R8) ]

System Overview
Multi channel adjustable TLC5615 The NC DC power supply is provided by 51 Minimum system of single chip microcomputer ,3 road TLC5615 Voltage digital to analog conversion circuit 、 Digital tube display module 、4*4 Matrix keyboard and alarm module .

Automatic mode
MCU control 3 Circuit DC voltage output , The nixie tube displays the current number of channels and the output voltage value of the channel in real time , Press the key to control the switching of the number of channels and the setting of voltage , The alarm module monitors whether the output voltage exceeds the maximum set value （3.9V）.

After the numerical quantity is input through the matrix keyboard , the TLC5615 Digital to analog chip conversion , Output analog DC voltage , The voltage adjustment range is 0.1V.

When the set value is greater than 3.9V when , Alarm module LED The light is on , At the same time, nixie tube display 0.0, Prompt to modify the input value again .

Manual mode
Switch a certain circuit SW Hit to the left , The output of this voltage is controlled by the sliding rheostat .

In manual mode , The voltage output is no longer affected 51 Single chip microcomputer 、 Digital to analog conversion chip and matrix keyboard control . The whole voltage output circuit consists of a sliding rheostat 、 Operational amplifiers and PNP Triode composition .

System simulation circuit diagram


Analysis of simulation results

1. Through the matrix keyboard , Set the first 2 The output voltage of the channel is 2.8V, give the result as follows .
   
   
2. When the keyboard sets the voltage output value to 4.2V（ Greater than 3.9V） when , Press the OK key , The nixie tube shows 0.0,LED The warning lamp is on , The actual voltage output is 0.02V≈0V.
   
   
   
3. Click on SW2, Turn the switch to the left , At this time, the output of voltage is controlled by sliding rheostat , No longer controlled by single chip microcomputer , In this example, the output voltage is 1.95V.
   
   part C Code

void main(void)				 // The main program 
{
      
// timer0_init(); // Initialize the timer 0
	while(1)
	{
     
		key_scan();			// Call keyboard scan function 
		TLC5615_DA_1(val_1);	// Process the value sent by the keyboard 
		TLC5615_DA_2(val_2);
		TLC5615_DA_3(val_3);
		switch(choice_flag)
		{
    
			case 1 : display(Vol_1+num_1-1);	break;
			case 2 : display(Vol_2+num_2-1);	break;
			case 3 : display(Vol_3+num_3-1);	break;
		}
		

	} 
}

void timer0_isr(void)  interrupt 1       	// timer0 Interrupt service function 
{
    
                         					// Bit selection variable of nixie tube 
	TR0 = 0;                       		 	// Stop count 
	TL0 = (65536-5000)%256;					// Reload counter initial value 
	TH0 = (65536-5000)/256; 
                              	// Bit cyclic variable plus 1
	if(cp >= 4)
		cp = 0; 
	switch(choice_flag)
	{
    
		case 1:    deal(val_1);break;
		case 2 :   deal(val_2);break;
		case 3:    deal(val_3);break;
	}
	
// deal(5698); // Cycle show 1 Time ,j Zero clearing 
   	TR0 = 1;
// deal(val_1);
// delay(100);
	P0=0xff;  // And j Corresponding ,P2 Output bit selection signal of nixie tube 
	switch(cp)
	{
    
		case 0: P0 = 0xc1;break;   	
		case 1: P0 = LED[shi];break;   	
		case 2: P0 = LED[bai]&0x7f;break;
// case 3: P0 = 0xbf;break; 
		case 3: P0 = LED[choice_flag];break; 
	} 
	P2 = Bit_sel[cp]; 
	cp++;  	
}  

The shared resources are

（1）C Program ;

（2）Proteus Simulation file ;

（3）TLC5615 Chip manual ;

（4） Program design flow chart ;

The full set of resources is as follows




Get multi-channel adjustable TLC5615 Design of NC DC regulated power supply system ,Proteus Simulation 、C Program 、Visio flow chart 、TLC5615 Wait for references .

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