Automotive wiper

FIELD: transport.

SUBSTANCE: invention relates to electric power circuit 10 for control of the vehicle wiper drive. Heat accumulator 16 to absorb heat emitted in power switch 14 in drive interlocking is connected with power switch 14. In sudden heat emission is power switch 14 prevailing portion of emitted heat can be tapped to heat accumulator 16 to allow designing said switch with selected parameters and use power switch 14 with higher resistance in electric power circuit 10.

EFFECT: wiper electric power circuit with high-resistance switch.

8 cl, 1 dwg

 

The present invention relates to a wiper for a vehicle having a drive unit for driving at least one wiper blade and power an electric circuit connected to the driving node and having a power switch to control them.

From WO 00/46082 known power electrical diagram for drive control node wiper of the car. For drive control node provides power switch (powerful transistor switch).

In such electric power scheme power switch must be dimensioned in such a way that it does not go down even when locking the drive unit, for example, when the solid freezing of windshield wiper blade for cleaning glass in the winter. Power switch for reliable perception of them power surge to the peak, suddenly happening in the locked state of the drive unit, without departing from building specially made with selected stock options in the sense that it has a correspondingly low ohmic resistance. Such execution of the power switch increases the cost of its manufacture.

The present invention was used to develop power wiring diagram for drive control node wiper of the vehicle, which is lowered to be able to use the power switch with a large resistance.

This task is solved according to the invention with distinctive characteristics, presents to claim 1 of the claims. Various preferred embodiments of the invention are given in the dependent claims.

Proposed in the invention of the windshield wiper for a vehicle has a drive unit for driving at least one wiper blade and power an electric circuit connected to the driving node and having a power switch to control them. In the proposed invention the wiper circuit breaker thermally connected to the heat accumulator to absorb the heat produced in the power switch when the block driving unit, and the heat accumulator has a compact geometry with a solid cross-section.

The presence of a thermal battery allows you to take suddenly released in a power switch heat primarily to accumulate away from the power switch. This uses the fact that a significant burden, which is exposed to the circuit breaker when locking the drive unit, it is necessary for thermal load and the parameters of the circuit are chosen depending on the maximum temperature to which it is heated at blocking the drive unit. The presence getalong battery allows to reduce the maximum temperature of the power switch, thanks to the power switch can be performed with selectable with a smaller stock options and use power wiring diagram power switch with high resistance, adesivi thereby making the power of the electrical circuit.

Thanks to the heat accumulator is not required to continue to provide the necessary temperature reduction in the power switch solely by natural convection, thus eliminating the need for heatsinks or radiators on the power switch. Thermal battery faster compared to the heat sinks to reduce the temperature of the power switch, allowing enough heat can be discharged early from the power switch with a concomitant reduction in the level of maximum temperature to which it is heated. In addition, heat from the power switch is not required to take only via the connected conductors and/or circuit Board, which have a much lower thermal conductivity and/or heat, because heat accumulator allows faster to allocate a greater amount of heat from the power switch. Average power dissipation of thermal energy per unit of time at a certain temperature, exhaust heat accumulator, more first of all, p is compared to the power dissipation, which can be discharged conductors and circuit Board, f times, with f≥1,2, primarily f≥1,8, preferably f≥2,5, particularly preferably f≥4,0. In addition, thermally coupled with the power switch heat accumulator makes it possible to extract the heat generated due to the resistance of the power switch. In the presence of thermal battery first heating circuit is much slower, allowing the blocking of the drive unit in a timely manner may be recognized, for example, control software in combination with acceptable sensory before heating circuit to the critical temperature as emergency shutdowns can occur already at lower temperatures of the power switch.

Due to the fact that the heat accumulator has a compact geometry with a solid (massive) cross-section, portions of thermal battery have a good thermal contact between them. As a result of this facilitated the distribution of heat within the heat accumulator, resulting eliminates heating of the outer surfaces of thermal battery to high temperatures. In addition, excluded the presence of stenosis, for which, compared to other parts of the heat accumulator is characterized by high heat flow.

In predpochtitelno embodiment, thermal battery is mainly made of metal material, providing the opportunity for very fast transfer of heat inside the heat accumulator. As a result of this improved heat distribution in thermal battery, resulting in the average temperature of its outer surfaces increases more slowly, and when locking the drive unit is particularly long, the temperature difference between the circuit breaker and a thermal battery. Heat accumulator primarily mainly made of copper, respectively, of a copper alloy.

In a particularly preferred embodiment, the heat accumulator has basically the shape of a rectangular parallelepiped, which allows to obtain simple to manufacture, compact construction, which can be particularly simple way to place on a common printed circuit Board with providing thermal contact with the power switch.

Heat accumulator primarily has a higher conductivity compared to the average thermal conductivity of the power switch. Due to the higher thermal conductivity of the heat accumulator allows particularly rapid heat dissipation from the power switch to heat the battery.

Heat accumulator can be produced primarily by napavine, mainly the accumulation of solder. This ensures in the lobby of a particularly simple manufacture of the heat accumulator, who, for example, when applying the necessary electrical conductors by soldering on the circuit Board can be formed by multiple supply a specific location on a printed circuit Board conductive track and the results in several layers of conductive tracks forming a compact heat accumulator with a solid cross-section.

In the preferred embodiment, power switch and heat accumulator connected to a common circuit Board, and a first power switch connected to a thermal battery as an electrical conductor. Thus, an electrical conductor may also be used to perform the function of a conductor of heat and to dissipate the heat generated in the power switch, located preferably offset from it by a thermal battery. There is no need to provide an insulating connection between the heat accumulator and the power switch. In addition, part of the heat can absorb the PCB and give it to the environment through its having a relatively large area of the surface by natural convection.

Power switch is primarily field-effect transistor, the first MOS transistor. The use of such a transistor allows to reduce the power switch. This option is primarily allows the contrast to bipolar transistors to receive power switch which has a positive temperature coefficient and which when too high amperage in the case of blocking of the drive unit is heated with an increase of active resistance. This effect leads to the automatic limitation of the current up until the power switch again to cool the heat battery is thermally coupled with the power switch, prevents it from heating up too high temperatures.

In a particularly preferred embodiment is provided by a signal line for transmission of a signal of the block driving unit, configured to feed it signal primarily depending on the temperature of the heat accumulator. The presence of such signal lines eliminates the need to control the drive unit, and instead offers an easy-to implement integrated circuit. While primarily used the fact that the temperature of the heat accumulator is a measure characterizing locked the drive unit, however short his blocking, which does not require the adoption of measures for the maintenance, automatically ignored.

Below the invention is described in more detail on the example of one of the preferred variants of its implementation with reference to the accompanying description edinstvennymi, which is schematically shown in the cross section proposed in the invention of the electric power scheme.

Shown in the accompanying description of the drawing the electric power circuit 10 has a cost of 12, with which is connected the power switch 14, for example, the MOS transistor. To the circuit Board 12 is connected further heat accumulator 16 in the form of a copper cube. Heat accumulator can be placed on the same side of the PCB 12, which is located and a power switch 14, and/or back, facing away from the power switch 14 side of the PCB 12. Heat accumulator 16 is indented from the power switch 14, which is not shown in the drawing, the drive unit of a wiper of the vehicle, and thermally connected to the circuit breaker 14 by conductor 18 and/or heat conductive track 20. With a sudden release of heat in the power switch 14 of the prevailing part of the heat can be quickly dissipated in the heat accumulator 16, allowing the circuit breaker 14 can be performed with selectable with a smaller stock options, namely: with great resistance, adesivi thus its production.

1. Windshield wiper for a vehicle having a drive unit for driving at least one wiper blade and power wiring diagram (10), connect the NUU with a driving node and having a power switch (14) to control them, characterized in that with the power switch (14) is thermally connected to the heat accumulator (16) for absorbing heat produced in the power switch (14) when locking the drive unit, and a heat accumulator (16) has a compact geometry with a solid cross-section.

2. The wiper according to claim 1, characterized in that the heat accumulator (16) mainly made of metal material.

3. The wiper according to claim 1, characterized in that the heat accumulator (16) has basically the shape of a rectangular parallelepiped.

4. The wiper according to claim 1, characterized in that the heat accumulator (16) has a higher conductivity compared to the average thermal conductivity of the power switch (14).

5. The wiper according to claim 1, characterized in that the heat accumulator (16) is made with the possibility of its manufacture by napavine, primarily the accumulation of solder.

6. The wiper according to claim 1, characterized in that the power switch (14) and the heat accumulator (16) connected to a common circuit Board (12) and the first power switch (14) connected to the heat accumulator (16) an electric conductor (20).

7. The wiper according to claim 1, characterized in that the power switch (14) has a field-effect transistor, the first MOS transistor.

8. The wiper according to claim 1, distinguishing the I, that provided a signal line for transmission of a signal of the block driving unit, configured to feed on her signal, primarily depending on the temperature of the heat accumulator (16).



 

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