Instructions for the Use of KY3-E2 Phase Shift Trigger
I. Overview:
At present, most of the three-phase thyristor flip-flops are made up of analog control circuit or single-chip computer + general circuit. One of their remarkable characteristics is that the trigger circuit is composed of them, which is either large in area, low in control precision, low in thyristor conduction efficiency or relatively simple in function. Under such market guidance, our company has used advanced design methods. Unlike existing companies, which generally use sawtooth wave to pick up signals, we use three-phase electricity to reduce three-phase signals through synchronous transformers, and then directly pick up signals on reduced three-phase electricity.
Under normal working conditions, an AC sinusoidal wave is input in each channel. The sinusoidal signal forms a rectangular wave through a zero comparator and a de-jitter circuit. A sharp pulse is formed at the edge of the rectangular wave, and a subtraction counter is started to count. The DC level control signal of 0-VDD is transformed into a digital quantity corresponding to the phase shift size by 10 bits A/D transformation, which is used as the initial value of the subtraction counter. When the counter is reduced to zero, another spike trigger signal is formed. The time difference between the two spikes corresponds to the phase shift angle, and the position of the output pulse group is determined by the latter spike. The output two pulse groups OUT+and OUT-correspond to the positive and negative half cycle of the sinusoidal wave respectively. There is a phase difference between the pulse group and the sinusoidal wave. The magnitude of_is controlled by the VCON DC level. When VCON increases continuously from 0V to VDD, _moves smoothly from 180 to 0, thereby controlling the conduction angle of the thyristor to achieve the purpose of regulating the output power.
KY3-E2 phase-shifting trigger is a digital-analog hybrid three-phase phase-shifting trigger integrated circuit, which contains complete fault protection functions such as phase-absence, over-current and over-heat. It has the advantages of high accuracy, perfect function, simple and reliable use, easy debugging, strong anti-interference, small size and complete protection circuit. The three-phase thyristor trigger circuit is mainly used in three-phase AC power supply power electronic products, including three-phase motor power drive module, AC motor stepless speed regulation, thyristor control circuit, AC frequency conversion, rectification, inversion, high-power power supply and so on. The combination of KY3-E2 flip-flop and high-power power power electronic devices can form a high-power integrated functional module, which is the best product for industrial automation control, power supply, motor drive and speed regulation.
Ⅱ.Performance characteristics
○ Unphase sequence requirement is limited. It can be used in 50/60Hz power grid with 10-380V power supply frequency.
○ It can directly interface with the output signals of various control instruments (temperature controllers) and microcomputers at home and abroad.
○ It is suitable for resistive load, inductive load, primary side of transformer and other load types.
○ It has soft start and soft stop function, reduces the impact interference to the power grid, and makes the main circuit more safe and reliable.
○ Driving power is strong, each circuit can output 800 mA of current, can drive 4000A thyristor.
○ It has the function of phase-absence protection.
○ Urgent stop function.
○ Temperature control and protection function.
○ Installation of housing, safe, moisture-proof and dust-proof.
○ Integration structure: power supply, synchronous transformer, trigger control circuit and pulse transformer are integrated. Structural tightness, easy debugging, simple wiring.
Ⅲ.Main Technical Indicators and Their Use
Input signal: 4-20mA DC 0-5V DC 0-10V 10K potentiometer (manual adjustment)
Output Specification: Three-phase or three-phase two-way trigger 0-100% output.
Phase shift range: 0-180.
Trigger capacity: <4000A thyristor.
Indicative function:
PW_power indication
OFF_Fault Protection Instruction
Power usage: AC1 and AC2 are connected to 220V main power supply. When users need to access 380V main power supply, please customize it with our company.
Load test: SCR can not work properly without load or current less than 0.5A when testing trigger. So the load current should be greater than 0.5A.
IV. Working methods
1. Three input modes can be selected:
○ 4-20mA input.
○ 0-5V input.
○ 0-10V input.
3. External protection switch: (reference control wiring diagram)
4. Pulse Forbidden Output (OFF Control Switch):
The trigger board can be controlled by an external switch (the OFF switch can also be connected with an external temperature control protection switch, etc.).
5. The trigger board can also form an external closed-loop automatic control system with a single chip computer and corresponding detection sensors.
V. Exclusion of Abnormal State
1. SCR has no output, no current or voltage:
○ The panel PW indicator is not on and SCR cannot work. Please check whether the power of the trigger is connected correctly.
○ Check whether the OFF indicator is on. If it is on, please check whether the protection system is protected or whether the main power supply is out of phase.
2. Trigger users can not solve the problem, please do not hesitate to contact us, we will solve it for you in time.