4 times power supply
5678 intra-field eff (d)
Motion of work:
The 1220v communication power passes through the leak-protected magnetic ring, which is protected against rf, pressure-sensitive vdr1 and x-capacitation in two ways:
Control the relays
The other route is full-streamed through the d1~d4 bridge, with the ec1, l2 and ec2-type filters forming +300v voltage。
The 2+300v voltage is delivered to the power source chip 5678 foot (inline field effect tube d pole) via the original side circuit group l2 of the high frequency transformer t, which is powered。
Following the start of power, the auxiliary circuit group l3 generates induction power through the d6 complete flow, the r2 limit flow, and the ec3 filter form a secondary voltage to the chip at four feet to maintain normal operation of the chip。
The 4-side bypass groups generate sensor power through the d9 stream, ec4, c3 filters, dz2 steady pressure formation +12v voltage relays, etc。
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5+12v voltage is re-elected by the +5v tri-end pressurer, ec5, c4 filter to form +5v voltage for control chips, etc。
6d5, r1, c1 are peaks for absorbing circuits, absorbing peak pulses from magnetic leakage from switches and protecting switches。
7zd1 is a +16v steady-pressure tube, when +300v voltage is high, +16v is high, zd1 reverse-conductor, chip 3 foot voltage increases, chip protection action。
Ii. Master core
U6 is the master chip, and if the circuit is normal, the leak protection chip u4 does not work, the seven feet of u4 are low level, the q1 is cut-off, and the 17 feet of u6 are high level + 5v。
The 17 feet of u6 are maintained in high-altitude condition, at which point the whole machine can start work。
Under normal conditions of all sensors, u6's 1 foot, 2 foot, 3 foot, 4 foot, 25 foot, 26 foot, 27 foot, 28 foot, depending on the user's needs, produces a four-way heating control signal, which is magnified back to the back amplifier u3 and then the output drive signal leads the corresponding relays and starts heating。
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Iii. Protection from leakage
U4 is the leak protection chip, l is the leak magnetic loop detection wire, q1 is the leak control triode npn, u6 is the main control chip and the 17 foot of u6 is the leak protection control foot。
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Motion of work:
When the electric water heater fails, 220v exchanges a zero-fire line (n, l) of an equal size (normally equal) and the leaking magnetic ring-reception circle l creates an induction power。
The induction power generated by l is transported to the leak protection chip 12 feet by electrical resistance r3, r4, which is raised。
12 two foot voltages, compared with internal circuits of u4, are exported from the u47 foot at a high level, which is channeled to q1 via r5。
Q1-conductor, turn 17 feet of the master chip u6 into a low level of electricity, and the master chip immediately ceases work, suspends all procedures and stops heating the output. And it's a leak。
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2. When electricity is not leaked, the leak protects the 12 feet of the chip without voltage input (0v), and the leak protects the circuits, as 220v transceiving zero-fire (n, l) wire currents are equal and the leaking magnetic ring does not generate an induction。
Iv. Sensors
The machine has two sensors:
1 water intake (cold water) device
It is a flow sensor, and the signal of the output is not expressed as high or low, but rather by the volume of the water flow in a unit of time, producing a different and variable pulsive signal。
The signal is entered into the six feet of the master chip u6 through the r14, r15 fraction pressure and adjusts the machine's operational status to the input's pulsive ratio。
2 hot water vent temperature sensors
It is a heat-sensitive electrical resistance with a negative temperature factor of around 100 k, which is used to detect thermal temperature of the water mouth。
The signal adjusts the temperature of the hot water by sending the data to the seven feet of the master chip u6 after a fraction pressure of r12, r13。
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V. Tests
The machine is a computer-based electro-heater with a self-check function, and the failure code is displayed in case of failure, so the corresponding malfunction area can be traced according to the failure code。
If the whole machine reacts, the power of the switch +12v, +5v shall be tested for normality and checked according to the power principle of the switch。
2. If the sensor fails, check the corresponding sensor element。
The output end temperature sensors fail to function, their resistance values are measured to be normal, and the handheld sensors measure whether their resistance values change, and good performance changes。
Water intake sensors, which can be blown through the mouth while measuring voltage changes in their signal lines, if any, are good。
In the case of a failure, a variety of possible reasons for the failure should first be examined:
The 1 heater's aging and broken, causing insulation to drop
Zero failure of 2 circuit board caused a power leak
3 power line failure, etc
We have to check it out before we can use it
The aim of this paper is to draw bricks and learn about learning, i. E. Thermal water heater circuit structure, working principles, trouble analysis, and sharing of comments by friends if they are deficient or inappropriate
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