Abstract: UAA1016/UAA2016 is uses the zero potential technical design, to be possible to actuate the bidirectional silicon-controlled rectifier’s temperature/power controller integrated circuit, may realize the ohmic load non-RFI power regulation through this chip. In the article introduced the UAA1016/UAA2016 main feature, the basic principle and the application electric circuit.
Key word: UAA1016/UAA2016; Zero potential switch; Temperature and power control
1 outline
At present had many specific IC (ASIC) to use the zero potential switch (ZVS) technology, they through were in the zero crossing pattern three end bidirectional silicon-controlled rectifier on-off element (Triac) to control on the AC line’s ohmic load. These ohmic load finds at everywhere, for example electric iron, thermostat (), hatchibator, hot clear poison, hot ramming machinery, jet flow type drying apparatus and glass glass defroster and so on.
Figure 1
The ZVS temperature and power controller ASIC mostly uses the bipolar technology manufacture, and uses 8 pin DIP or the SO seal, only needs the few exterior part then to be possible to carry on the operation directly on the AC line, moreover does not have the DC electric current ingredient to wind through the main line. This kind of ASIC has many varieties and the model, this article only UAA1016 which produces to Motorola and Anson US Corporation and UAA2016LIANG a kind of chip makes the brief introduction.
2 ZVS temperature controller UAA1016
UAA1016 uses 8 pin plastic DIP seal, the internal structure diagram and exterior part connection as shown in Figure 1.
2.1 proportion temperature control
UAA1016 outputs a negative current pulse through 8 foot’s on examination resistance Rsync in the AC master line voltage cross zero hour in 6 feet, controls Traic. In order to cause on the AC line not to have any DC ingredient, in time of one complete oscillation period, IC internal full wave logic allows the Traic lock to save. The IC foot on 3 connects NTC thermistor RT uses for sensing temperature. When the foot 3 on voltages are higher than the foot 4 voltages (Vref), the component can produce a trigger pulse. In order to limit the frequency, should connect 1kW or the 1kW above load on the AC electric circuit. The IC internal time base may use in controlling the proportion temperature. In fact, the most heating control system has the high precision and the stability, moreover the request temperature overswing is small, therefore cannot use/to close (on/off) directly to adjust.
2.2 UAA1016 essential electric circuit function
a. Power source
UAA1016 adopts 5 foot exterior voltage dropping resistor 熗 ǔN18kΩ/2W 牎⒍Manages extremely 煟 guarantees the danger towering Egypt Egypt load 牶 to stop guarantees Egyptian oh ta frequency Mu Shunǖ wrinkly gauze qia benzene yo cherry grain of Meng to slander rises suddenly> twines the towering its current consumption to be lower than 1mA.
b. Comparator
When IC foot 3 on voltage Vpin3 is higher than foot 4 on voltage Vpin4 煟 Zheng Ying Tangui 犑 guarantees the comparator permission triggering logic is Triac submits a pulse. In order to cause the non-controllable temperature range 熡 shin bare hui to kill the soil 牸 bare> the step wan series deep pool decayed tooth displacement lag input voltage to design quite slightly 煛 ±10mV 牎
Comparator opposition input end 熃 Niu Chu犐 is Mou Wei jealous Miao Gengzheng Ying Tan the Xian sodium arrogant value may by resistance R2, R3 and the R4 煵 Wei chart 1 犐 pomelo vast iteration may determine its proportional region on the Vref denticle signal scope.
When on the temperature sensor RT temperature is higher than the setting value, because does not have the heating, the temperature will reduce slowly. Before exerts the power, Vpin3-Vpin4 will surpass the lag value 50%. Otherwise, when the RT temperature is lower than the setting value, will present the opposite result.
c. Sawtooth generator
The IC foot 2 interior 7.5μA constant currents may carry on the charge between threshold level VTH1 and VTH2 to exterior electric capacity Cpin2 to produce saw-tooth wave. In fact, Cpin2 only then has the charge and the electric discharge in AC line’s negative half period. The IC foot 1 on saw-tooth wave signal may take the potential source, its voltage Vpin1 is Vpin2-0.75V. In order to maintain the denticle signal the good line broad minded, recommendation use 40μA source electric current.
d. Sampling full wave logic
In order to maintain the smallest noise, in the AC circuit voltage’s half period, will produce two neighboring zero crossing pulses, but in cross zero scope’s pulse generating process as shown in Figure 2. This time if the AC line’s voltage frequency is fAC 煟 the load Egypt 60Hz 牐 voltage effective value is Vrms 熑 relieves Bolivian Bolivia Egypt Zheng 牐 that Figure 2 tP1 and tP2 respectively are:
In fact, pulse width tP1, tP2 may also carry on the adjustment through IC foot 8 on resistance Rsync, shown in Figure 3 are between the output pulse width and the synchronized resistance relational curve.
e. Synchronizing circuit
The synchronizing circuit examines AC line’s cross zero through Rsync, the Rsync value is deciding the trigger pulse width. Uses the zero crossing electric current examination has ±27μA~±98μA threshold.
In the UAA1016 pulse amplifier may be Triac provides is not smaller than the 60mA triggering fills the electric current.
2.3 UAA1016 application electric circuits
UAA1016 煟 gathers together 犜 interrogates cash string application electric circuit as shown in Figure 4. In this electric circuit’s heater power is 2KW, RT=22kΩ±10% 煟 kui Bolivian negligent Gui 牐b the value is 370°, in 25℃ under proportion temperature range is 1℃.
3 ZVS power controller UAA2016
UAA2016 uses 8 pin DIP 煟 to wink the grain of Bolivian Egypt to guarantee bites school 牷 Ying Yingxi 煟 to wink the grain of Bolivian Egypt to guarantee bites mold 牱 Yu Aiqi pin arrangement as shown in Figure 5.
Figure 6 is the UAA2016 internal structure and the application electric circuit. The IC power source may through the high-pressured rectification diode which connects with voltage dropping resistor RS provide, and passes the IC foot 7 and the foot 5 between electric capacity CF filter. In the electric circuit governing system’s joint current may divide into four parts, namely IC electric current, sensing bridge connection electric current, Triac control extremely trigger pulse and internal zener diode electric current.
The connection 3 1 (Vref=-5.5V) between NTC thermistor RT uses in the IC foot with the foot examining the temperature. The foot 3 on voltages are survey the temperature the function, this voltage must compare with the internal control voltage. But the internal control 煵 consoles mark 牭 Miao Guaidi sandfly[the catfish informs xie blue-beard Miao Geng⑽Dew Ran Dangtu the father bare earthworm gu consulted Kang Muzuo the N energy conservation, UAA2016 has established specially a programmable temperature reduced end 熃 Niu Chu牐 the temperature threshold value level by 4 feet and Vcc between foot’s resistance R1 establishment, when the design has been possible the R1 selection curve which provided according to the manufacturer to determine its resistance number. When the foot 3 on inputs are higher than the materials for internal reference value, the comparator can allow the triggering logic to transmit the pulse extremely for the Triac control. In order to improve the anti-noise ability, 
this comparator also has an adjustable delay. The IC foot 2 the 牸 lai male deep attachment daimei tortoiseshell remote scale broom corn millet admonish pomelo hat Ran Xianjian with foot 7 煟 Zheng Beibei the noisy bare earthworm red healthy I pomelo intermediary cow department road to be possible to obtain a 10mV lag level, is equal in 0.15℃. 2 connect Vcc the foot to be possible to obtain the biggest lag, this situation is established in 5℃ on.
In order to conform to the European standard, in the load opens/closes the cycle to surpass for 30 seconds. The UAA2016 internal digit saw-tooth wave completes this function through the fulfillment proportional control, moreover does not need any additional part.
When the temperature sensor leads the way, the comparator input voltage will surpass the threshold voltage which establishes specially, this time vital circuit inhibiting pulse output. Sampling full wave logic may guarantee that produces two neighboring cross zero trigger pulse in each AC line’s half period, the IC output pulse width 煟 abundant school pulls takes Sang Sangmei MeiNiu Fu Nailiao Kang Qianmao remote hydra nc to carry on the adjustment. If the operating power is the PL, AC circuit voltage is Vrms, that load resistance RL is:
RL=V2rms/PL
When the AC line frequency is f 熐 remote abundant Ying Liangman surprised Nao Sheshan the discipline ㄌ voltage is VTM, load current IL may through under formula computation:
IL= 煟 Zheng Ying Hui· 21/2sin 煟 dials school Gui Deng牐 VTM 牐 RL
The designers may the curve which provides according to the load parameter and the manufacturer determine Rsync and the TP value.
UAA2016 fills the electric current peak-to-peak value from the foot 6 to the VEE pulse amplifier not to be lower than 70mA, the effective output electric current scope may give by foot 6 exterior output impedance Rout. The resistance which and Triac control electric current 煟 Sang Qianyu provides according to the manufacturer the 犞 relational curve may determine extremely needs Rout value. For example: Regarding a 2kW load and 220Vrms circuit voltage, if Triac chooses MAC212A8, then its biggest peak value gate trigger current is extremely 50mA 煟 kui Bolivian negligent Gui 犑bao Rout must choose 60Ω.
Figure 6
4 concluding remark
ZVS Triac controller UAA1016 and UAA2016 may operate directly on the AC line. It uses the part to be few, may realize the ohmic load non-RFI power regulation. This kind of ZVS power and temperature controller’s application is widespread, moreover designs simply, the cost is also very low.
