ELECTRONIC CIRCUIT TO VERIFY THE STATE OF INTEGRITY OF A DIODE
It is disclosed an electronic circuit to verify the state of integrity of a diode. The electronic circuit comprises a voltage comparator and a voltage divider. The electronic circuit is configured to generate a monitoring signal having a first value indicative of a state of correct operation of the diode and having a second value indicative of a state of short circuit of the diode.
1 - 9 . (canceled)
10 . An electronic circuit to verify a state of integrity of a diode, the electronic circuit comprising:
a first terminal adapted to receive an anode voltage of the diode;
a second terminal adapted to receive a cathode voltage of the diode;
an input terminal adapted to receive a monitoring voltage;
an output terminal adapted to generate a monitoring signal representative of a state of operation of the diode;
a voltage divider configured to generate a partitioned voltage as a function of the monitoring voltage; and
a voltage comparator configured to compare a voltage drop at ends of the diode with respect to a value of the partitioned voltage and to generate therefrom the monitoring signal;
wherein the voltage comparator is configured to:
detect that the voltage drop at the ends of the diode is greater than the partitioned voltage and generate therefrom the monitoring signal having a first value indicative of a state of correct operation of the diode; and
detect that the voltage drop at the ends of the diode is less than the partitioned voltage and generate therefrom the monitoring signal having a second value indicative of a state of short circuit of the diode.
11 . The electronic circuit according to claim 10 , wherein:
in case of correct operation of the diode, the diode is in a reverse polarization state and the voltage drop at the ends thereof is equal to the monitoring voltage; and
in case of short circuit of the diode, the voltage drop at the ends of the diode is substantially zero.
12 . The electronic circuit according to claim 10 , wherein the voltage divider comprises a series connection of a first resistor and of a second resistor, wherein the partitioned voltage is a common terminal between the first resistor and the second resistor.
13 . The electronic circuit according to claim 10 , wherein the voltage comparator comprises a negative terminal adapted to receive a reference voltage equal to the partitioned voltage and comprises a positive terminal adapted to receive the cathode voltage of the diode.
14 . The electronic circuit according to claim 13 , further comprising a resistor interposed between the input terminal and the positive terminal of the voltage comparator.
15 . The electronic circuit according to claim 13 , comprising a further diode interposed between the positive terminal of the voltage comparator and the cathode voltage of the diode.
16 . A power supply electronic system comprising:
an electronic circuit comprising:
a first terminal adapted to receive an anode voltage of a diode;
a second terminal adapted to receive a cathode voltage of the diode;
an input terminal adapted to receive a monitoring voltage;
an output terminal adapted to generate a monitoring signal representative of a state of operation of the diode;
a voltage divider configured to generate a partitioned voltage as a function of the monitoring voltage;
a voltage comparator configured to compare a voltage drop at ends of the diode with respect to a value of the partitioned voltage and to generate therefrom the monitoring signal;
wherein the voltage comparator is configured to:
detect that the voltage drop at the ends of the diode is greater than the partitioned voltage and generate therefrom the monitoring signal having a first value indicative of a state of correct operation of the diode; and
detect that the voltage drop at the ends of the diode is less than the partitioned voltage and generate therefrom the monitoring signal having a second value indicative of a state of short circuit of the diode;
a further diode connected in parallel to the electronic circuit, the diode having a cathode terminal coupled to a positive terminal of the voltage comparator and having an anode terminal coupled to a negative terminal of the voltage comparator; and
a switch interposed between a power supply voltage different from the monitoring voltage and the anode terminal of the diode, the switch being configured to switch between an open position and a closed position as a function of the value of a control signal.
17 . The power supply electronic system according to claim 16 , further comprising an electric load having a terminal connected to the cathode terminal of the diode, wherein the diode is interposed between the power supply voltage and the electric load.
18 . The power supply electronic system according to claim 16 , wherein the cathode terminal of the diode is coupled to the positive terminal of the comparator by means of a further diode and the anode terminal of the diode is coupled to the negative terminal of the comparator by means of a second resistor.
19 . The electronic circuit according to claim 11 , wherein the voltage divider comprises a series connection of a first resistor and of a second resistor, wherein the partitioned voltage is a common terminal between the first resistor and the second resistor.
20 . The electronic circuit according to claim 11 , wherein the voltage comparator comprises a negative terminal adapted to receive a reference voltage equal to the partitioned voltage and comprises a positive terminal adapted to receive the cathode voltage of the diode.
21 . The electronic circuit according to claim 12 , wherein the voltage comparator comprises a negative terminal adapted to receive a reference voltage equal to the partitioned voltage and comprises a positive terminal adapted to receive the cathode voltage of the diode.
22 . The electronic circuit according to claim 19 , wherein the voltage comparator comprises a negative terminal adapted to receive a reference voltage equal to the partitioned voltage and comprises a positive terminal adapted to receive the cathode voltage of the diode.
23 . The electronic circuit according to claim 20 , further comprising a resistor interposed between the input terminal and the positive terminal of the voltage comparator.
24 . The electronic circuit according to claim 21 , further comprising a resistor interposed between the input terminal and the positive terminal of the voltage comparator.
25 . The electronic circuit according to claim 22 , further comprising a resistor interposed between the input terminal and the positive terminal of the voltage comparator.
26 . The electronic circuit according to claim 14 , comprising a further diode interposed between the positive terminal of the voltage comparator and the cathode voltage of the diode.
27 . The electronic circuit according to claim 20 , comprising a further diode interposed between the positive terminal of the voltage comparator and the cathode voltage of the diode.
28 . The electronic circuit according to claim 21 , comprising a further diode interposed between the positive terminal of the voltage comparator and the cathode voltage of the diode.
29 . The power supply electronic system according to claim 17 , wherein the cathode terminal of the diode is coupled to the positive terminal of the comparator by means of the further diode and the anode terminal of the diode is coupled to the negative terminal of the comparator by means of a second resistor.