Transformer overtemperature alarm circuit
Source: InternetPublisher:消失的歌 Keywords: Transformer alarm circuit potential LED Updated: 2021/09/28
The transformer over-temperature alarm circuit is as shown in the figure.
It connects the current transformers TA1 and TA2 to
certain two-phase lines on the secondary side of the transformer, and the positive temperature coefficient thermistor
RT is immersed in the transformer oil. The AC voltage induced by TA1 and TA2
has a certain potential
at point A after being filtered by VD1 rectifier and Ci . When the oil temperature rises,
the resistance of RT also increases, making the ③ pin potential of the operational amplifier greater
than the ② pin potential, and its ◎ pin outputs a high potential , making
the audio oscillator composed of VT1, VT2, island, and BL work.
operation, then the speaker BL and the light-emitting diode LED send
out an audible and visual alarm signal.
- Experiment on realizing photoelectric alarm using photosensitive devices
- Low illumination amplifier circuit
- "OR" logic element configuration circuit
- One of the water full alarm circuits
- Power outage emergency lighting
- SC3071 touch step dimming light circuit
- Lighting audio control circuit
- Telephone theft automatic notification device circuit diagram
- Touch/wireless remote control dimmer light circuit diagram
- Night target display circuit diagram
- Application circuit diagram for driving 5 white LEDs
- Circuit diagram of a high-brightness and energy-saving LED lamp cup
- LT3755 driver LED application circuit diagram
- Ordinary optocoupler isolation circuit
- Level display circuit diagram composed of LED level meter driver integrated circuit
- Wall wire detection circuit
- Soil moisture detection circuit
- Transformer overtemperature alarm circuit
- LED indicator integrated circuit
- Alkaline battery charger circuit diagram
京公网安备 11010802033920号