Delay between two PWM signal

Projects Programming
1

Hi...
I am generating two pwm signal for two different switches.The arrangement of switch is like half bridge inverter. I want to give delay between these two signal.

#include"Arduino.h"
#include "TimerOne.h"
double duty, ref;
void setup() 
{   
  Timer1.initialize(100); // set a timer of length 100000 microseconds (or 0.1 sec - or 10Hz => the led will blink 5 times, 5 cycles of on-and-off, per second)
  
}
 
void loop(){
  // Main code loop
  ref=9;
  if (ref > 10) {
    duty=(ref-10.5)*1023;
    duty=duty/10.5;
    Timer1.pwm(10,duty); 
 
    //delayMicroseconds(40);
    Timer1.pwm(9,duty);
  }
}

When i am giving delay in this code , it is not working.
so how to do please tell me.
I don't want to do it in hardware.

2

when will ref > 10 ?

I think there is missing code

3

There are bits in one of the timer1 control registers that set the output sense
(inverted or not) for each pin independently, so you can setup anti-phase signals
on pin 9 and 10, with a controllable gap (deadtime). I don't know if Timer1 library
gives control over this, if not you'll have to program the timer1 registers directly.