Circuit arrangement for monitoring freewheeling diodes
A freewheeling diode and circuit device technology, which is applied in the direction of measuring device, electronic circuit testing, measuring electricity, etc., can solve the problems of high circuit overhead, high cost, and increase of total cost, etc.
Active Publication Date: 2021-06-01
KNORR-BREMSE SYST FUER NUTZFAHRZEUGE GMBH
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Problems solved by technology
It is therefore disadvantageous not only the high circuit outlay on the analog side for realizing the valve current measurement, but also the high costs associated therewith, which undesirably increases the overall costs, especially with a large number of standard modules
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[0036] figure 1 A simplified schematic diagram according to a first exemplary embodiment of a circuit arrangement for monitoring a freewheeling diode on a solenoid valve actuated by pulse width modulation is shown. According to the embodiments described here, the circuit arrangement shown can be provided primarily for a solenoid valve drive stage in a central electronic control unit, which controls or regulates, especially for commercial use, via solenoid valves connected to stored air. Brake pressure in the wheel cylinders of the electro-pneumatic brakes of vehicles and / or commercial vehicles with trailers. However, it is not limited thereto. By means of the described circuit arrangement, it is also possible to monitor other freewheeling diodes.
[0037] Such as figure 1 As shown, the entire circuit arrangement contains a monitoring section (shown at the top in the drawing) and a test or inspection section (shown at the bottom in the drawing). In this respect, the monitor...
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The invention relates to a circuit arrangement for monitoring a freewheeling diode on a solenoid valve actuated by means of pulse width modulation, comprising at least one diode (D1) and a monitoring transistor (D1) in a pulse width modulation actuation branch of the circuit arrangement T1). The diode (D1) in the control branch is arranged in the conduction direction connected to the freewheeling diode (FLD) to be monitored and activates the monitoring transistor (T1) when its threshold voltage is exceeded, which outputs a monitoring signal. During the test operation, the monitoring transistor is periodically switched on independently of the remaining state in the circuit arrangement and the resulting periodic monitoring signal is fed to the same output. If a continuous high-level monitoring signal is detected, it is known that the freewheeling diode (FLD) is faulty. The freewheeling diode (FLD), the first part circuit arrangement for monitoring the freewheeling diode (FLD) and the second part circuit arrangement for checking the first part circuit arrangement are detected if a monitoring signal which is periodically first high and then decays is detected. Some circuit devices work normally. If no signal is detected, it is known that there is a fault in these partial circuit arrangements.
Description
technical field [0001] The invention relates to a circuit arrangement for monitoring a diode, in particular to a circuit arrangement for monitoring a freewheeling diode on a solenoid valve actuated by means of PWM. Background technique [0002] Freewheeling diodes are often used to protect against overvoltage when switching off inductive DC voltage loads in solenoid valves. For this purpose, a semiconductor diode is connected in parallel with the magnet as an inductive DC load, so that it is required by the supply voltage in the blocking direction. After switching off the supply voltage, the self-induction of the coil causes the current to continue to flow first in the original direction. Without freewheeling diodes, this leads to voltage peaks which are superimposed on the operating voltage and can damage or destroy the switching path. However, the voltage peaks are limited to the conduction voltage of the diode by means of the freewheeling diode, so that the electronic c...
Claims
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IPC IPC(8): G01R31/28
CPCG01R31/2829
Inventor T·福伊希特
Owner KNORR-BREMSE SYST FUER NUTZFAHRZEUGE GMBH