Rectifier circuit composed of bridge stack and its fault treatment — SUNMATE
Rectifier circuit composed of bridge stack and its fault treatment
What is the rectifier circuit composed of bridge stack and fault treatment?
Rectifier circuit composed of bridge stack and its fault treatment
(1) Breakdown fault, that is, there is an internal diode breakdown.
(2) Open circuit fault, that is, there is an open circuit in one or two diodes.
(3) Heat generation occurs in the bridge stack, which is mainly due to overcurrent fault in the circuit, or the internal resistance of a diode in the bridge stack is too large.
Bridge stack or half bridge stack can not work normally in the circuit in case of open circuit or breakdown fault, and some will damage other components in the circuit.
Bridge pile detection method with Multimeter
Use the R & times of the multimeter; 1K gear can easily detect the quality of full bridge stack and half bridge stack. Its basic principle is to measure the forward and reverse resistance of internal diodes.
Rectifier circuit composed of bridge stack and its fault treatment
Below), or the forward resistance of one time is large and the reverse resistance of one time is small, it can be considered that the bridge stack has been damaged. To be exact, one or several diodes in the bridge stack have been damaged.
W in the above four groups of tests, if one is open circuit (infinite resistance) or one is short circuit (dozens). The quality detection method of half bridge stack is the same as above, and it is simpler, because there are only two diodes in half bridge stack.
Positive bridge rectifier circuit composed of bridge stack and its fault analysis
The bridge rectifier circuit composed of bridge stack is the same as the rectifier circuit composed of four diodes, as shown in Fig. 3. Zl1 in the circuit is a bridge pile, and its internal circuit is four rectifier diodes connected into a bridge circuit. If the internal circuit of bridge stack zl1 is inserted into the circuit, it is a standard positive bridge rectifier circuit, and the circuit analysis method is the same as before.
Rectifier circuit composed of bridge stack and its fault treatment
After mastering the working principle of positive bridge rectifier circuit of discrete components, it is only necessary to analyze the circuit around the four pins of bridge zl1:
(1) The two AC voltage input pins "~" are connected to the secondary coil of the power transformer. These two pins are not divided into positive and negative polarity.
(2) The positive terminal "+" is connected with the rectifier circuit load to output positive DC voltage. (3) It is connected with the ground wire. In the circuit outputting positive voltage, the negative terminal must be grounded. As shown in Table 2, the fault analysis of bridge stack forming positive bridge rectifier circuit.