CN206301737U - Driving device of relay and automobile with same - Google Patents

Abstract

The utility model discloses the drive device and automobile of a kind of relay, the device includes：Voltage conversion circuit, it is used to enter line translation to the voltage of power supply；Voltage detection unit, the voltage that it is used to detect relay driving coil is to generate voltage detection signal；Current detecting unit, it is used for detection stream and crosses the electric current of relay driving coil to generate current detection signal；Control unit, it is used for the control voltage translation circuit after open command is received and starts, and the first voltage signal that swaps out is become according to voltage detection signal control voltage translation circuit adhesive is carried out with control relay, and after relay adhesive, become the second voltage signal that swaps out according to current detection signal control voltage translation circuit and adhesive is kept with control relay, wherein, voltage of the voltage of second voltage signal less than first voltage signal.Thus, it is possible to ensure relay reliability adhesive after supply voltage reduction, and relay driving coil heating is reduced, reduce energy loss.

Description

Driving device of relay and automobile with same

technical field

The utility model relates to the technical field of automobiles, in particular to a driving device for a relay and an automobile with the driving device.

Background technique

In the related art, the driving circuit shown in FIG. 1 is usually used to drive the automotive relay. This driving circuit has a simple structure and low cost. However, it has the following disadvantages. Firstly, the voltage of the power supply of the drive circuit may decrease, which may cause the relay to fail to pull in. Second, after the relay is pulled in, since the voltage of the power supply is always applied to both ends of the relay drive coil, the It will cause the relay drive coil to heat up, resulting in a waste of energy.

Therefore, related technologies need to be improved.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of this utility model is to provide a driving device for a relay, which can ensure that the relay is still reliably engaged after the power supply voltage is reduced, and can reduce the heating of the relay driving coil after the relay is engaged.

Another object of the present utility model is to provide an automobile.

In order to achieve the above object, the utility model proposes a driving device for a relay on the one hand, comprising: a voltage conversion circuit, the input end of the voltage conversion circuit is connected to the power supply, and the output end of the voltage conversion circuit is connected to the relay drive coil connected, the voltage conversion circuit is used to convert the voltage of the power supply; a voltage detection unit, the voltage detection unit is connected to the relay drive coil, and the voltage detection unit is used to detect the voltage of the relay drive coil voltage to generate a voltage detection signal; a current detection unit, the current detection unit is connected to the relay drive coil, and the current detection unit is used to detect the current flowing through the relay drive coil to generate a current detection signal; a control unit, The control unit is respectively connected to the voltage conversion circuit, the voltage detection unit and the current detection unit, and the control unit is used to control the start of the voltage conversion circuit after receiving the start instruction, and according to the voltage The voltage detection signal fed back by the detection unit controls the voltage conversion circuit to convert the first voltage signal to control the relay to pull in, and after the relay is pulled in, according to the current detection fed back by the current detection unit The signal controls the voltage conversion circuit to convert a second voltage signal to control the relay to keep on, wherein the voltage of the second voltage signal is lower than the voltage of the first voltage signal.

According to the drive device of the relay proposed by the utility model, the voltage conversion circuit converts the voltage of the power supply and provides the converted voltage to the relay drive coil, the voltage detection unit detects the voltage of the relay drive coil to generate a voltage detection signal, and the current detection The unit detects the current flowing through the relay drive coil to generate a current detection signal. The control unit controls the voltage conversion circuit to start after receiving the opening command, and controls the voltage conversion circuit to convert the first voltage signal according to the voltage detection signal to control the relay to pull in. , and after the relay is turned on, the voltage conversion circuit is controlled to transform the second voltage signal according to the current detection signal to control the relay to keep turning on. Therefore, the driving device of the relay of the utility model can change the output voltage of the voltage conversion circuit as required, thereby ensuring that the relay is still reliably engaged after the power supply voltage is reduced, and at the same time, reducing the heating of the relay drive coil after the relay is reliably engaged. Reduce the loss of the relay drive coil. Moreover, the circuit structure of the device is simple, which can ensure the safe and stable operation of the relay.

Specifically, the voltage conversion circuit has a first output terminal and a second output terminal, the first output terminal of the voltage conversion circuit is connected to one end of the relay driving coil, and the second output terminal of the voltage conversion circuit is grounded .

Further, the voltage conversion circuit includes: a first switch tube, a first pole of the first switch tube is connected to one end of the power supply, a control pole of the first switch tube is connected to the control unit, The other end of the power supply is grounded; the first inductance, one end of the first inductance is connected to the second pole of the first switching tube, and the other end of the first inductance is grounded; a diode, the cathode of the diode Connected to the second pole of the first switching tube; a first capacitor, one end of the first capacitor is connected to the anode of the diode, and the other end of the first capacitor is grounded.

Further, the voltage detection unit includes: a first resistor and a second resistor connected in series, one end of the first resistor and the second resistor connected in series is connected to one end of the relay driving coil, and the first resistor connected in series and the other end of the second resistor are grounded, and a first node between the first resistor and the second resistor is connected to the control unit.

Further, the current detection unit includes: a third resistor connected between the other end of the relay driving coil and the ground, one end of the third resistor is connected to the other end of the relay driving coil and has a second node, the other end of the third resistor is grounded, and the second node is connected to the control unit.

Further, the current detection unit further includes: a fourth resistor connected between the second node and the control unit, one end of the fourth resistor connected to the second node, The other end of the fourth resistor is connected to the control unit; the second capacitor, one end of the second capacitor is connected to the other end of the fourth resistor, and the other end of the second capacitor is grounded.

Specifically, the power supply may be a vehicle battery.

Specifically, the voltage of the first voltage signal may be the rated voltage of the relay.

In order to achieve the above purpose, another aspect of the utility model proposes an automobile, which includes the drive device for the relay.

According to the automobile proposed by the utility model, through the driving device of the relay, it can ensure that the relay is still reliably engaged after the power supply voltage is reduced.

Description of drawings

Fig. 1 is the circuit schematic diagram of the driving device of the relay in the related art;

Fig. 2 is a schematic block diagram of a driving device for a relay according to an embodiment of the present invention;

Fig. 3 is a schematic circuit diagram of a driving device of a relay according to an embodiment of the present invention; and

Fig. 4 is a schematic block diagram of a car according to an embodiment of the present invention.

Reference signs:

A voltage conversion circuit 10, a voltage detection unit 20, a current detection unit 30 and a control unit 40;

Power supply 50 and relay 60; Relay driving coil 61;

a first switching tube Q1, a first inductor L1, a diode D1 and a first capacitor C1;

a first resistor R1 and a second resistor R2;

The third resistor R3, the fourth resistor R4 and the second capacitor C2;

The driving device 100 of the vehicle 200 and the relay.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The following describes the driving device of the relay proposed by the embodiment of the present invention and the automobile with it with reference to the accompanying drawings.

Fig. 2 is a schematic block diagram of a driving device for a relay according to an embodiment of the present invention. As shown in FIG. 2 , the driving device of the relay includes: a voltage conversion circuit 10 , a voltage detection unit 20 , a current detection unit 30 and a control unit 40 .

Wherein, the input terminal of the voltage conversion circuit 10 is connected with the power supply 50, the output terminal of the voltage conversion circuit 10 is connected with the relay drive coil 61, and the voltage conversion circuit 10 is used for converting the voltage of the power supply 50; the voltage detection unit 20 and the relay The drive coil 61 is connected, and the voltage detection unit 20 is used to detect the voltage of the relay drive coil 61 to generate a voltage detection signal; the current detection unit 30 is connected to the relay drive coil 61, and the current detection unit 30 is used to detect the current flowing through the relay drive coil 61 to generate a current detection signal; the control unit 40 is connected to the voltage conversion circuit 10, the voltage detection unit 20 and the current detection unit 30 respectively, and the control unit 40 is used to control the voltage conversion circuit 10 to start after receiving the start instruction, and according to the voltage detection unit The voltage detection signal fed back by 20 controls the voltage conversion circuit 10 to convert the first voltage signal to control the relay 60 to pull in, and after the relay 60 is pulled in, the voltage conversion circuit 10 is controlled to convert according to the current detection signal fed back by the current detection unit 30 A second voltage signal is output to control the relay 60 to keep pulling in, wherein the voltage of the second voltage signal is lower than the voltage of the first voltage signal.

That is to say, when the driving device of the relay is working, under the control of the control unit 40, the voltage conversion circuit 10 can convert the DC voltage provided by the vehicle battery, such as 12V vehicle DC voltage, into the voltage required for the pull-in of the relay 60, and The converted voltage is supplied to the relay drive coil 61 .

According to a specific embodiment of the present invention, the driving device of the relay can be used to drive an automobile relay, and the power supply 50 can be a vehicle battery, such as a 12V starting battery.

According to a specific embodiment of the present invention, the voltage of the first voltage signal may be the rated voltage of the relay 60 . The rated voltage of the relay 60 refers to the rated voltage required for the relay 60 to be turned on.

Specifically, after the control unit 40 receives the start command, the control unit 40 outputs a drive signal to the voltage conversion circuit 10 to control the voltage conversion circuit 10 to convert the first voltage signal with a fixed width (for example, 150 ms) and a fixed amplitude, In order to make the relay 60 pull in reliably. During this process, the driving device of the relay 60 works in the voltage control mode, that is, the voltage detection unit 20 detects the voltage of the relay driving coil 61 to generate a voltage detection signal, and the control unit 40 according to the voltage detection signal fed back by the voltage detection unit 20 Adjust the duty cycle of the driving signal so that the voltage conversion circuit 10 continues to output the first voltage signal with a fixed width (for example, 150 ms) and a fixed amplitude value within 150 ms after the control unit 40 receives the turn-on command. At this time, the first voltage The voltage value of the signal is consistent with the rated voltage of the relay 60 . In this way, under the action of the first voltage signal, the relay 60 can be pulled in quickly and reliably, ensuring that the relay can work stably even when the power supply fluctuates.

Furthermore, when the relay 60 works stably after being pulled in, the drive device of the relay 60 works in the current control mode, that is to say, the current detection unit 30 detects the current flowing through the relay drive coil 61 to generate a current detection signal, and the control unit 40 according to The current detection signal fed back by the current detection unit 30 adjusts the duty cycle of the drive signal so that the voltage conversion circuit 10 outputs the second voltage signal. At this time, the voltage value of the second voltage signal can be kept at the second preset voltage (such as a relay 60 pull-in maintenance voltage, the relay 60 pull-in maintenance voltage is less than the rated voltage of the relay 60), so as to ensure that the current flowing through the relay drive coil 61 is consistent with the preset maintain current of the relay drive coil 61. In this way, under the action of the second voltage signal, the relay 60 can reliably maintain the pull-in state, and at the same time, the loss of the relay driving coil 61 is reduced to a minimum.

In this way, the driving device of the relay in the embodiment of the utility model can change the output voltage of the voltage conversion circuit 10 as required, and when the relay 60 is pulled in, the voltage conversion circuit 10 converts the first voltage signal (such as the rated voltage of the relay 60); When the relay 60 works stably after being turned on, the voltage conversion circuit 10 converts the second voltage signal (for example, the holding voltage of the turned on relay 60 ) according to the current flowing through the relay driving coil 61 .

Therefore, the driving device of the relay in the embodiment of the utility model can change the output voltage of the voltage conversion circuit according to the needs, thereby ensuring that the relay is still reliably engaged after the power supply voltage is reduced, and at the same time, the relay driving coil is reduced after the relay is reliably engaged. Heat generation, reducing the loss of the relay drive coil. Moreover, the circuit structure of the device is simple, which can ensure the safe and stable operation of the relay.

According to an embodiment of the present invention, as shown in Figure 3, the voltage conversion circuit 10 has a first output terminal out1 and a second output terminal out2, and the first output terminal out1 of the voltage conversion circuit 10 is connected to one end of the relay drive coil 61 , the second output terminal out2 of the voltage conversion circuit 10 is grounded to GND. Wherein, the relay driving coil 61 is connected in parallel with the voltage conversion circuit 10 as a load, and the voltage conversion circuit 10 can change the output voltage V0 according to the working state of the relay 60 to output the first voltage signal or the second voltage signal.

According to an embodiment of the present invention, as shown in FIG. 3 , the voltage conversion circuit 10 includes: a first switch tube Q1, a first inductor L1, a diode D1, and a first capacitor C1, wherein the first switch tube Q1 pole is connected to one end of the power supply 50, the control pole of the first switching tube Q1 is connected to the control unit 40, and the other end of the power supply 50 is grounded; one end of the first inductor L1 is connected to the second pole of the first switching tube Q1, and the second pole of the first switching tube Q1 is connected to the ground. The other end of an inductor L1 is grounded; the cathode of the diode D1 is connected to the second pole of the first switching tube Q1; one end of the first capacitor C1 is connected to the anode of the diode D1, and the other end of the first capacitor C1 is grounded.

According to an embodiment of the present invention, as shown in FIG. 3 , the voltage detection unit 20 includes: a first resistor R1 and a second resistor R2 connected in series, one end of the first resistor R1 and the second resistor R2 connected in series with the relay drive coil One end of 61 is connected, the other end of the first resistor R1 and the second resistor R2 connected in series are grounded to GND, and the first node between the first resistor R1 and the second resistor R2 is connected to the control unit 40 .

According to an embodiment of the present utility model, as shown in FIG. 3 , the current detection unit 30 includes: a third resistor R3 connected between the other end of the relay drive coil 61 and the ground, one end of the third resistor R3 and the relay drive coil The other end of 61 is connected and has a second node, the other end of the third resistor R3 is grounded, and the second node is connected to the control unit 40 .

According to an embodiment of the present invention, as shown in FIG. 3 , the current detection unit 30 further includes: a fourth resistor R4 and a second capacitor C2, wherein the fourth resistor R4 is connected between the second node and the control unit 40, One end of the fourth resistor R4 is connected to the second node, and the other end of the fourth resistor R4 is connected to the control unit 40; one end of the second capacitor C2 is connected to the other end of the fourth resistor R4, and the other end of the second capacitor C2 is grounded.

Specifically, the control unit 40 outputs a drive signal to the first switch tube Q1 after receiving the turn-on command, and the first switch tube Q1 is turned on or off under the drive of the drive signal, and then the voltage conversion circuit 10 converts the voltage provided by the power supply 50 to The DC voltage is transformed into a high-voltage signal with a fixed width (such as 150 ms) and a fixed amplitude value (the rated voltage of the relay 60), assuming that the input voltage of the voltage conversion circuit 10 is Vin, and the output voltage is V0, then the duty cycle D of the drive signal= V0/(V0+Vin).

Further, when the relay 60 is turned on, the driving device of the relay 60 works in the voltage control mode, the voltage detection unit 20 includes a voltage divider circuit formed by the first resistor R1 and the second resistor R2, and the voltage V2 at both ends of the second resistor R2= V0*R2/(R1+R2), the control unit 40 adjusts the duty cycle D of the driving signal output to the first switch tube Q1 by sampling the voltage signal across the second resistor R2, thereby controlling the output voltage of the voltage conversion circuit 10 V0 is maintained at the first voltage signal, and at this moment, the voltage value of the first voltage signal is consistent with the rated voltage of the relay 60 . In this way, under the action of the first voltage signal, the relay 60 can be pulled in quickly and reliably, and can generate less loss during stable operation.

After the relay 60 is turned on, the driving device of the relay 60 works in the current control mode, and the current detection unit 30 includes an RC filter circuit composed of a third resistor R3, a fourth resistor R4, and a second capacitor C2. The current of the driving coil 61 is sampled, and the RC filter circuit formed by the fourth resistor R4 and the second capacitor C2 performs filtering processing on the current signal sampled by the third resistor R3. The control unit 40 adjusts the duty cycle D of the drive signal output to the first switch tube Q1 according to the current signal fed back by the current detection unit 30, thereby controlling the output voltage V0 of the voltage conversion circuit 10 to be the second voltage signal. The voltage value of the two-voltage signal can be kept close to the second preset voltage (for example, the holding voltage of the relay 60 ), so as to ensure that the current flowing through the relay driving coil 61 is consistent with the preset holding current of the relay driving coil 61 . In this way, under the action of the second voltage signal, the relay 60 can reliably maintain the pull-in state, and at the same time, the loss of the relay driving coil 61 is reduced to a minimum.

In summary, according to the relay drive device proposed by the embodiment of the present invention, the voltage conversion circuit converts the voltage of the power supply and provides the converted voltage to the relay drive coil 61, and the voltage detection unit detects the voltage of the relay drive coil 61 to Generate a voltage detection signal, the current detection unit detects the current flowing through the relay drive coil 61 to generate a current detection signal, the control unit controls the voltage conversion circuit to start after receiving the start command, and controls the voltage conversion circuit according to the voltage detection signal to convert the first The voltage signal is used to control the pull-in of the relay, and after the pull-in of the relay, the second voltage signal is controlled by controlling the voltage conversion circuit according to the current detection signal to control the pull-in of the relay. Therefore, the driving device of the relay of the utility model can change the output voltage of the voltage conversion circuit as required, thereby ensuring that the relay is still reliably engaged after the power supply voltage is reduced, and at the same time, reducing the heating of the relay drive coil after the relay is reliably engaged. Reduce the loss of the relay drive coil. Moreover, the circuit structure of the device is simple, which can ensure the safe and stable operation of the relay.

Fig. 4 is a schematic block diagram of a car according to an embodiment of the present invention. As shown in FIG. 4 , the vehicle 200 includes a relay drive device 100 .

To sum up, according to the automobile proposed by the embodiment of the present invention, through the driving device of the relay, it can ensure that the relay is still reliably engaged after the power supply voltage is reduced. loss.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (9)

1. a kind of drive device of relay, it is characterised in that including：

Voltage conversion circuit, the input of the voltage conversion circuit is connected with power supply, the voltage conversion circuit it is defeated Go out end to be connected with relay driving coil, the voltage conversion circuit is used to enter line translation to the voltage of the power supply；

Voltage detection unit, the voltage detection unit is connected with the relay driving coil, and the voltage detection unit is used In the voltage for detecting the relay driving coil generating voltage detection signal；

Current detecting unit, the current detecting unit is connected with the relay driving coil, and the current detecting unit is used In detection flow through the relay driving coil electric current to generate current detection signal；

Control unit, described control unit is examined with the voltage conversion circuit, the voltage detection unit and the electric current respectively Survey unit to be connected, described control unit is used to control the voltage conversion circuit to start after open command is received, and according to The voltage detection signal of the voltage detection unit feedback controls the voltage conversion circuit to become the first voltage signal that swaps out To control the relay to carry out adhesive, and after the relay adhesive, further according to described in current detecting unit feedback Current detection signal controls the voltage conversion circuit to become and swaps out second voltage signal to control the relay to keep adhesive, its In, the voltage of the voltage less than the first voltage signal of the second voltage signal.

2. the drive device of relay according to claim 1, it is characterised in that the voltage conversion circuit has first Output end and the second output end, one end phase of the first output end of the voltage conversion circuit and the relay driving coil Even, the second output head grounding of the voltage conversion circuit.

3. the drive device of relay according to claim 1 and 2, it is characterised in that the voltage conversion circuit includes：

First switch pipe, the first pole of the first switch pipe is connected with one end of the power supply, the first switch pipe Control pole be connected with described control unit, the other end of power supply ground connection；

First inductance, one end of first inductance is extremely connected with the second of the first switch pipe, first inductance it is another One end is grounded；

Diode, the negative electrode of the diode is extremely connected with the second of the first switch pipe；

First electric capacity, one end of first electric capacity is connected with the anode of the diode, another termination of first electric capacity Ground.

4. the drive device of relay according to claim 2, it is characterised in that the voltage detection unit includes：

The first resistor and second resistance of series connection, the first resistor of the series connection and one end of second resistance are driven with the relay One end of moving winding is connected, the first resistor of the series connection and the other end ground connection of second resistance, the first resistor with it is described First node between second resistance is connected with described control unit.

5. the drive device of relay according to claim 2, it is characterised in that the current detecting unit includes：

It is connected to the 3rd resistor between the other end of the relay driving coil and ground, one end of the 3rd resistor and institute The other end for stating relay driving coil is connected and with Section Point, and the other end of the 3rd resistor is grounded, and described second Node is connected with described control unit.

6. the drive device of relay according to claim 5, it is characterised in that the current detecting unit also includes：

4th resistance, the 4th resistance is connected between the Section Point and described control unit, the 4th resistance One end is connected with the Section Point, and the other end of the 4th resistance is connected with described control unit；

Second electric capacity, one end of second electric capacity is connected with the other end of the 4th resistance, second electric capacity it is another End ground connection.

7. the drive device of relay according to claim 1, it is characterised in that the power supply is on-vehicle battery.

8. the drive device of relay according to claim 1, it is characterised in that the voltage of the first voltage signal is The rated voltage of the relay.

9. a kind of automobile, it is characterised in that the drive device including the relay according to any one of claim 1-8.