Connecting the DVR to the car's on-board network. Scheme, description

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Connecting the DVR to the car's on-board network. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Modern car DVRs, as a rule, are connected to the car's on-board network through the cigarette lighter socket. In most domestic cars, according to the standard electrical equipment diagram, + 12 V is constantly supplied to the cigarette lighter socket connector, regardless of the position of the key in the ignition switch.

The exception is most foreign cars, where the cigarette lighter only works when the ignition is on (ignition switch in the ON position). There is an inconvenience to constantly pull out the DVR connector from the cigarette lighter socket when putting the car in the garage, and when leaving - do not forget to insert the DVR connector back into the socket.

Such an inconvenience is excluded in cars where the cigarette lighter connector is powered and in the “parking” (ACC) lock position, but here another thing arises - the DVR will be turned off if the ignition key is removed from the lock, i.e. when the car is parked. This is especially true if it is not in the garage, but "sleeps" on the street.

Connecting the DVR to the car's on-board network
Fig. 1

The device, the scheme of which is shown in fig. 1, turns on the video recorder when the ignition is turned on and does not turn it off when the car is parked, thereby optimizing its work as a monitoring device. The operation of the device is based on the self-locking of relay K1 when voltage is applied from the ignition switch. The relay is activated and with its contacts K1.1 connects its winding and the recorder through the fusible insert FU1 and the XP2 connector to the +12 V power line, which does not turn off when the key is removed from the ignition switch. Diode VD1 blocks the voltage supply from the +12 V line to the ignition switch when the contacts K1.1 of the relay are closed, and in the event of a breakdown of the diode in the ignition switch circuit, the fusible insert FU1 or FU2 will protect. Their rated current should be no more than 2 A with an average consumption of the ignition circuit of 5 A. Diode VD2 protects the on-board network from emissions of self-induction EMF of the relay coil. With the SB1 button, if necessary, you can turn off the DVR. For ease of use, the DVR uses an additional cigarette lighter socket, to which the XP1 terminal is connected.

Connecting the DVR to the car's on-board network
Fig. 2

Structurally, relay K1 and diodes VD1, VD2 are mounted on a printed circuit board with dimensions of 40x25 mm made of foil fiberglass. The printed circuit board and the additional cigarette lighter socket, together with the SB1 button, are attached to a panel made of plastic, laminated plywood or other suitable material (Fig. 2). Two switches installed to the left of the SB1 button are designed to turn on additional devices. The button can be any with one pair of normally closed contacts, functionally - with self-return, as shown in the diagram (see Fig. 1) or with repeated pressing (fixation). Diodes VD1, VD2 - with an average forward current of at least 1 A and a reverse voltage of at least 50 V. XP1-XP4 terminals - automotive knife "plug". Relay K1 - JZC-4123-12VDC, any low-power relay with a permissible contact current of more than 1 A will do.

The electrical circuit diagram of each brand of car is individual, so it is quite difficult to specify specifically which terminals (with their numbers and reference designations) the device should be connected to. In general, the XP2 terminal should be connected to the + 12 V power line, which does not turn off when the key is removed from the ignition switch (it may be the positive terminal of the standard cigarette lighter socket), and the XP3 terminal should be connected to the wire coming from the ignition switch, on which, when turning the key to the "ignition on" position, +12 V appears. Finding these wires is easy using a test lamp.

The device does not require adjustment, it is mounted in the cabin in a convenient place and has proven itself well in work on VAZ and GAZ cars of early years of production. The regular cigarette lighter socket remains free, and additional devices can be connected to it.

Author: A. Titarenko

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