Surge protection circuit and method for testing a surge protection circuit
A technology of overvoltage protection circuit and electric potential, which is applied in the direction of emergency protection circuit device for limiting overcurrent/overvoltage, emergency protection circuit device, electronic protection circuit test, etc. Loss and other problems, to achieve high breakdown voltage, accurate identification, and realize the effect of cost
Active Publication Date: 2013-12-18
KNORR BREMSE SYST FUER NUTZFAHRZEUGE GMBH
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Problems solved by technology
Here, it is mostly not possible to check whether the protective circuit is still functional during the operating time, or whether its function has been lost due to corrosion or other environmental influences
If the protection circuit is no longer functional, this cannot be identified in the prior art and there is only a supposed protection against such an overvoltage at the interface of the integrated circuit
This means that the protective function of this protective circuit can no longer be ensured when an excessive voltage is actually present at the interface of the integrated circuit, so that in this case the integrated circuit may be damaged despite the protective circuit
Method used
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Embodiment Construction
[0028] figure 1 A block diagram of a commercial vehicle with an embodiment of the overvoltage protection circuit according to the invention is shown. figure 1 Shown is a commercial vehicle 100 , such as a truck or a bus, which has a control device 110 for the ABS function in order to provide corresponding control signals to braking units 120 of the wheels of the commercial vehicle 100 . In this case, the control device 110 is supplied with electrical energy, for example, by an energy store 130 (for example a battery), wherein an electrical line is provided between a supply potential connection VCC and a ground potential connection GND. In addition, other figure 1 Components not shown in can also be connected to the supply potential connection VCC and the ground potential connection GND. For example, a charging socket is provided for charging the energy store 130 via which the two mentioned potential connections can be brought into electrical contact.
[0029] If energy stor...
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The invention relates to a surge protection circuit (20) that has at least one first electronic component (D1) with a nonlinear characteristic, said component being connected in an electrically conductive manner between a tapping point (200) to which a supply potential (VCC) can be applied and a node point (220). The surge protection circuit (20) further has at least one second electronic component (D2, D3) with a nonlinear characteristic, said component being connected in an electrically conductive manner between a tapping point (210) to which a ground potential (GND) can be applied and the node point (220). The surge protection circuit (20) further comprises a resistor (R1) that is connected between the node point (220) and a control connection (DIO). The surge protection circuit (20) finally comprises a monitoring unit (230) that is designed to apply a specified voltage to the control connection (DIO) or to output a specified current via the control connection (DIO) and to ascertain a voltage or a potential at the node point (220) in response to said specified voltage or specified current, said monitoring unit (230) being designed to identify a malfunction of the surge protection circuit (20) when the voltage that is detected at the node point (220) is not in a specified relation to an expected voltage.
Description
technical field [0001] The invention relates to an overvoltage protection circuit and a method for testing an overvoltage circuit according to the independent claims. Background technique [0002] In conventional electronic circuits, eg for control devices of safety devices in commercial vehicles, protective circuits are often used in order to prevent excessive voltages at the interfaces of the integrated circuit. In this case, it is mostly not possible to check whether the protective circuit is still functional during the operating time, or whether its function has been lost due to corrosion or other environmental influences. If the protective circuit is no longer functional, this cannot be detected in the prior art, and there is only a presumed protection against such an overvoltage at the interface of the integrated circuit. This means that the protective function of such a protective circuit can no longer be ensured if an overvoltage actually occurs at the interface of ...
Claims
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IPC IPC(8): H02H9/04
CPCG01R31/3277H02H9/043H02H9/042H02H9/041H02H9/00G01R31/12G01R31/2827
Inventor 托马斯·福伊希特
Owner KNORR BREMSE SYST FUER NUTZFAHRZEUGE GMBH