Rearview mirror defrosting circuit, rearview mirror and vehicle

Abstract

The utility model provides a rearview mirror defrosting circuit, a rearview mirror and a vehicle, and belongs to the technical field of vehicles, the rearview mirror defrosting circuit comprises a first power supply, an electric control switch, a trigger module, a control module and a heating wire; the first power supply, the electric control switch and the heating wire are sequentially connected in series; the electric control switch is electrically connected with the trigger module and the control module respectively; wherein the trigger module is configured to respond to a conduction signal and drive the electric control switch to be closed, so that the first power supply supplies power to the electric heating wire; and the control module is configured to maintain the closed state of the electric control switch when the electric control switch is closed, and drive the electric control switch to be switched off when the temperature of the electric heating wire is higher than the target temperature, so that the first power supply stops supplying power to the electric heating wire. The defrosting circuit for the rearview mirror is applied to the rearview mirror, so that the operation of a driver can be simplified, and the driver can concentrate on ensuring safe driving.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, and in particular relates to a rearview mirror defrosting circuit, a rearview mirror and a vehicle. Background Art

[0002] In cold weather, the rearview mirror of the vehicle will be frosted, which will affect the driver's field of vision during driving, causing the driver to be unable to accurately judge the road conditions behind, to the side, and below the car, as well as the driving conditions of the vehicle behind the current vehicle through the feedback from the rearview mirror. Therefore, it is necessary to deal with the frost condensed on the rearview mirror in time to ensure that the driver can smoothly obtain the scene behind the vehicle through the rearview mirror.

[0003] Vehicle rearview mirrors in related technologies generally have integrated defrost circuits, but the defrost circuit can only be turned off manually by the driver. If the driver forgets to turn it off, the defrost circuit integrated in the rearview mirror may be overheated and damaged due to long-term continuous heating of the rearview mirror, thereby causing the defrost function of the rearview mirror to fail and cannot be used normally during subsequent driving, affecting the function of the rearview mirror. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a rearview mirror defrost circuit, a rearview mirror and a vehicle, so as to overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect of an embodiment of the present application, a rearview mirror defrosting circuit is provided, comprising: a first power source (1), an electric control switch (Q1), a trigger module (2), a control module (3) and a heating wire (L); the first power source (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence, and the electric control switch (Q1) is electrically connected to the trigger module (2) and the control module (3) respectively; wherein:

[0006] The trigger module (2) is configured to drive the electric control switch (Q1) to close in response to a conduction signal, so that the first power source (1) supplies power to the heating wire (L);

[0007] The control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed, and to drive the electric control switch (Q1) to open when the temperature of the heating wire (L) is higher than the target temperature, so that the first power supply (1) stops supplying power to the heating wire (L).

[0008] Furthermore, the trigger module (2) comprises: a defrost switch (Q2) and a second power supply (21), wherein a first end of the defrost switch (Q2) is connected to the second power supply (21), and a second end of the defrost switch (Q2) is connected to the electric control switch (Q1); wherein:

[0009] The second power supply (21) is used to output a first level signal;

[0010] The defrost switch (Q2) is used to close in response to the conduction signal and to open after the conduction signal disappears; wherein, when the defrost switch (Q2) is closed, the first level signal output by the second power supply (21) drives the electronically controlled switch (Q1) to close.

[0011] Furthermore, the trigger module (2) further comprises: an indicator light (22), wherein a first end of the indicator light (22) is respectively connected to the electric control switch (Q1), the defrost switch (Q2) and the control module (3), and a second end of the indicator light (22) is connected to a ground terminal; wherein:

[0012] The indicator light (22) is used to light up when the first power source (1) supplies power to the heating wire (L).

[0013] Furthermore, the control module (3) comprises: a temperature control switch (Q3), wherein the temperature control switch (Q3) is connected in parallel to both ends of the electric control switch (Q1); wherein:

[0014] The temperature-controlled switch (Q3) is configured to output the second level signal output by the first power supply (1) to the electric-controlled switch (Q1) when the electric-controlled switch (Q1) is closed, so as to keep the electric-controlled switch (Q1) in the closed state;

[0015] And, it is configured to disconnect in response to the temperature of the heating wire (L) being higher than the target temperature. When the temperature-controlled switch (Q3) is disconnected, the second level signal stops being transmitted to the electric control switch (Q1) to drive the electric control switch (Q1) to disconnect.

[0016] Furthermore, the control module (3) further comprises: a diode (D1); wherein the anode of the diode (D1) is connected to the temperature-controlled switch (Q3), and the cathode of the diode (D1) is connected to one end of the electric-controlled switch (Q1), so as to prevent a reverse induced current from reaching the temperature-controlled switch (Q3) when the electric-controlled switch (Q1) is switched from closed to open.

[0017] Furthermore, the defrost switch (Q2) is a reset switch.

[0018] Furthermore, the temperature control switch (Q3) is a normally closed switch.

[0019] Furthermore, it also includes a fuse (FU); wherein the fuse (FU) is connected in series between the first power supply (1) and the electronically controlled switch (Q1).

[0020] According to a second aspect of the embodiments of the present application, a rearview mirror is provided, wherein the rearview mirror comprises the rearview mirror defrost circuit as described in the first aspect of the embodiments of the present application.

[0021] According to a third aspect of the embodiments of the present application, a vehicle is provided, wherein the vehicle comprises a rearview mirror as described in the second aspect of the embodiments of the present application.

[0022] The present application provides a rearview mirror defrosting circuit according to an embodiment, comprising: a first power supply (1), an electric control switch (Q1), a trigger module (2), a control module (3) and a heating wire (L); the first power supply (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence, and the electric control switch (Q1) is electrically connected to the trigger module (2) and the control module (3) respectively; wherein the trigger module (2) is configured to drive the electric control switch (Q1) to close in response to a conduction signal, so that the first power supply (1) supplies power to the heating wire (L); and the control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed, and to drive the electric control switch (Q1) to open when the temperature of the heating wire (L) is higher than a target temperature, so that the first power supply (1) stops supplying power to the heating wire (L).

[0023] The rearview mirror defrosting circuit provided above is applied to the defrosting function of the rearview mirror of a vehicle. The first power supply (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence. The electric control switch (Q1) is electrically connected to the trigger module (2) and the control module (3) respectively. The trigger module (2) is configured to drive the electric control switch (Q1) to close in response to a conduction signal, and the control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed.

[0024] Therefore, when frost appears on the rearview mirror, a conduction signal is sent to the trigger module (2), and the trigger module (2) responds to the conduction signal to take action and drive the electric control switch (Q1) to close, thereby conducting the circuit between the first power supply (1) and the heating wire (L), so that the first power supply (1) supplies power to the heating wire (L), causing the heating wire (L) to heat up and treat the frost condensed on the rearview mirror. At this time, the control module (3) can also respond to the closure of the electric control switch (Q1) and maintain the closed state of the electric control switch (Q1). Even if the conduction signal disappears, the first power supply (1) can continue to supply power to the heating wire (L) and continue to treat the frost condensed on the rearview mirror.

[0025] In addition, since the first power source (1) keeps supplying power to the heating wire (L), the heating wire (L) will continue to heat and melt the frost condensed on the rearview mirror. After the frost condensed on the rearview mirror is processed, since the electric control switch (Q1) remains in a closed state, the heating wire (L) will quickly heat up. In order to prevent the temperature of the heating wire (L) from exceeding the target temperature and damaging other components in the rearview mirror defrosting circuit, the control module (3) can drive the electric control switch (Q1) to disconnect when the temperature of the heating wire (L) is higher than the target temperature. When the driver forgets to turn off the defrosting circuit, the circuit between the first power source (1) and the heating wire (L) can be automatically turned off, so that the first power source (1) stops supplying power to the heating wire (L), thereby preventing the heating wire (L) from continuing to heat up and damaging other electronic components in the circuit where the heating wire (L) is located, causing the defrosting function of the rearview mirror to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 It is a module schematic diagram of a rearview mirror defrosting circuit provided in an embodiment of the present application;

[0028] Figure 2 It is a structural schematic diagram of a rearview mirror defrosting circuit provided in an embodiment of the present application;

[0029] Figure 3 It is a rearview mirror defrosting circuit diagram provided by an embodiment of the present application;

[0030] Reference numerals:

[0031] 1-first power supply; 2-trigger module; 3-control module; 21-second power supply; 22-indicator light; L-heating wire; Q1-electric control switch; Q2-defrost switch; Q3-temperature control switch; FU-fuse; D1-diode; D2-light-emitting diode; R-resistor. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to enable the scope of the present application to be fully conveyed to those skilled in the art.

[0033] Reference Figure 1 , Figure 1 is a module schematic diagram of a rearview mirror defrosting circuit provided in an embodiment of the present application; Figure 1 It can be seen that the rearview mirror defrosting circuit comprises: a first power supply (1), an electric control switch (Q1), a trigger module (2), a control module (3) and a heating wire (L); the first power supply (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence, and the electric control switch (Q1) is electrically connected to the trigger module (2) and the control module (3) respectively; wherein the trigger module (2) is configured to drive the electric control switch (Q1) to close in response to a conduction signal, so that the first power supply (1) supplies power to the heating wire (L); and the control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed, and to drive the electric control switch (Q1) to open when the temperature of the heating wire (L) is higher than a target temperature, so that the first power supply (1) stops supplying power to the heating wire (L).

[0034] In this embodiment, when the rearview mirror is frosted, the frost condensed on the rearview mirror is generally treated by heating the heating wire (L) in the rearview mirror. Figure 1 Since the first power source (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence, the electric control switch (Q1) can be controlled to be closed to conduct the circuit where the first power source (1), the electric control switch (Q1) and the heating wire (L) are located, and the heating wire (L) is powered by the first power source (1), so that the heating wire (L) generates heat to treat the frost condensed on the rearview mirror, thereby ensuring that the driver can clearly obtain the scene behind the vehicle through the rearview mirror.

[0035] In addition, since the rearview mirror is defrosted, the driver generally takes corresponding measures after discovering frost condensing on the rearview mirror. Therefore, in this embodiment, the source of the conduction signal can be that the driver presses a mechanical button or touches the display screen to send a conduction signal to the trigger module (2), or the driver sends a voice, and the vehicle terminal recognizes the driver's intention through voice and sends a conduction signal to the trigger module (2), wherein the conduction signal can be a physical contact signal of mechanical pressing, or a level signal sent by a trigger instruction. Since the trigger module (2) is configured to respond to the conduction signal, after the trigger signal receives the conduction signal sent by the driver through the above action, it will drive the electric control switch (Q1) to close. Since the first power supply (1), the electric control switch (Q1) and the heating wire (L) are connected in series in sequence, then at this time, the circuit between the first power supply (1) and the heating wire (L) will be turned on, so that the first power supply (1) supplies power to the heating wire (L), and the current flowing through the heating wire (L) will generate heat, and the heat will melt the frost condensed on the rearview mirror.

[0036] Since the conduction signal can only be sent by the driver, the driver cannot be distracted during driving and the conduction signal is continuously sent, so that the trigger module (2) continuously drives the electric control switch (Q1) to close, so that the first power supply (1) supplies power to the heating wire (L). Figure 1 It can be seen that in the rearview mirror defrosting circuit of the present embodiment, a control module (3) is also provided, and the control module (3) is connected to the trigger module (2) and the electric control switch (Q1) respectively, and the control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed. Therefore, when the electric control switch (Q1) is closed, the control module (3) will maintain the electric control switch (Q1) in the closed state, thereby simplifying the driver's defrosting operation, and the driver does not need to be distracted to operate the conduction signal to maintain the closed state of the first switch, so that the driver's energy can be saved, so that he can concentrate on ensuring safe driving.

[0037] In addition, in order to ensure safe driving, the driver cannot always pay attention to the defrosting of the rearview mirror during driving. There is also a situation where the frost on the rearview mirror is completely processed, but the driver is concentrating on driving and does not notice that the frost on the rearview mirror has been processed and forgets to turn off the rearview mirror heating, or the driver forgets to turn on the rearview mirror heating, so that the electric control switch (Q1) is always in a closed state. In this case, the first power supply (1) will continue to supply power to the heating wire (L), and after the heating wire (L) heats and melts the frost on the rearview mirror, The heating is continued to increase in temperature. At this time, due to the continued increase in temperature of the heating wire (L), it is very likely that other electronic components in the circuit where the heating wire (L) is located will be damaged due to excessive temperature, so that the subsequent rearview mirror heating and defrosting function will fail. Therefore, the control module (3) can also drive the electronic control switch (Q1) to disconnect when the temperature of the heating wire (L) is higher than the target temperature, so that the first power supply (1) can be cut off from continuously supplying power to the heating wire (L), so that the heating wire (L) continues to heat up and damages various electronic components and circuits in the circuit where the heating wire (L) is located.

[0038] Therefore, through the rearview mirror defrosting circuit provided by this embodiment, when frost appears on the rearview mirror, a conduction signal is sent to the trigger module (2), and the trigger module (2) responds to the conduction signal to drive the electric control switch (Q1) to close, thereby conducting the circuit between the first power supply (1) and the heating wire (L), so that the first power supply (1) supplies power to the heating wire (L), causing the heating wire (L) to heat up and treat the frost condensed on the rearview mirror. At this time, the control module (3) can also respond to the closure of the electric control switch (Q1) and maintain the closed state of the electric control switch (Q1). Even if the conduction signal disappears, the first power supply (1) can continue to supply power to the heating wire (L) and continue to treat the frost condensed on the rearview mirror.

[0039] In addition, since the first power source (1) keeps supplying power to the heating wire (L), the heating wire (L) will continue to heat and melt the frost condensed on the rearview mirror. After the frost condensed on the rearview mirror is processed, since the electric control switch (Q1) remains in a closed state, the heating wire (L) will quickly heat up. In order to prevent the temperature of the heating wire (L) from exceeding the target temperature and damaging other components in the rearview mirror defrosting circuit, the control module (3) can drive the electric control switch (Q1) to disconnect when the temperature of the heating wire (L) is higher than the target temperature. When the driver forgets to turn off the defrosting circuit, the circuit between the first power source (1) and the heating wire (L) can be automatically turned off, so that the first power source (1) stops supplying power to the heating wire (L), thereby preventing the heating wire (L) from continuing to heat up and damaging other electronic components in the circuit where the heating wire (L) is located, causing the defrosting function of the rearview mirror to fail.

[0040] In one embodiment, the trigger module (2) comprises: a defrost switch (Q2) and a second power supply (21), wherein a first end of the defrost switch (Q2) is connected to the second power supply (21), and a second end of the defrost switch (Q2) is connected to the electric control switch (Q1); wherein the second power supply (21) is used to output a first level signal; and the defrost switch (Q2) is used to close in response to the conduction signal and to open after the conduction signal disappears; wherein, when the defrost switch (Q2) is closed, the first level signal output by the second power supply (21) drives the electric control switch (Q1) to close.

[0041] In this embodiment, refer to Figure 2 , Figure 2The present invention is a schematic diagram of the structure of a rearview mirror defrosting circuit provided by an embodiment of the present application; the trigger module (2) also includes a defrost switch (Q2) and a second power supply (21), and the first end of the defrost switch (Q2) is connected to the second power supply (21), and the second end of the defrost switch (Q2) is connected to the electric control switch (Q1). The defrost switch (Q2) is a switch used to respond to a conduction signal to close and to disconnect after the conduction signal disappears. In this way, the driver only needs to briefly manipulate the conduction signal to send out during driving, and does not need to pay attention to the defrosting of the rearview mirror all the time. Therefore, when the driver manipulates the conduction signal to send out, the defrost switch (Q2) will respond to the conduction signal to close, and then the circuit between the second power supply (21) and the electric control switch (Q1) will be turned on. Since the second power supply (21) is used to output a first level signal, the second power supply (21) outputs the first level signal, which is transmitted to the electric control switch (Q1), and the electric control switch (Q1) is driven to close by the first level signal. The electronically controlled switch (Q1) may be a relay, as long as the first level signal can ensure that the relay is attracted and the circuit between the first power source (1) and the heating wire (L) is connected. In addition, the electronically controlled switch (Q1) may also be a MOS tube, as long as the first level signal can act on the gate of the MOS tube and the MOS tube is connected to the circuit between the first power source (1) and the heating wire (L). This embodiment does not limit this. The second power source (21) may be provided by an instrument of the vehicle, or it may be directly provided by a vehicle battery like the first power source (1). Generally speaking, the voltage of the second power source (21) is lower than the voltage of the first power source (1).

[0042] In one embodiment, the trigger module (2) further comprises: an indicator light (22), wherein a first end of the indicator light (22) is respectively connected to the electric control switch (Q1), the defrost switch (Q2) and the control module (3), and a second end of the indicator light (22) is connected to a ground end; wherein the indicator light (22) is used to light up when the first power source (1) supplies power to the heating wire (L).

[0043] In this embodiment, in order to facilitate the driver to know whether the rearview mirror is in the heating and defrosting state at this time, an indicator light (22) is added to the trigger module (2). The indicator light (22) is lit when the first power supply (1) supplies power to the heating wire (L), so as to inform the driver that the heating wire (L) in the rearview mirror is in the heating state at this time. When the driver determines that the rearview mirror does not need to be defrosted, he can perform corresponding operations to turn off the electric control switch (Q1) by himself, so that the heating wire (L) stops heating. Figure 1It can be seen that the first end of the indicator light (22) is respectively connected to the electric control switch (Q1), the defrost switch (Q2) and the control module (3), and the second end of the indicator light (22) is connected to the ground end. Then, when the trigger module (2) responds to the conduction signal and drives the electric control switch (Q1) to close, the current output by the first power supply (1) can flow into the heating wire (L) through the electric control switch (Q1) in sequence, and flow into the indicator light (22) through the electric control switch (Q1) and the control module (3), so that the indicator light (22) is lit. Since the current output by the first power supply (1) flows into the heating wire (L) and the indicator light (22) synchronously, when the first power supply (1) supplies power to the heating wire (L), the indicator light (22) will also be lit.

[0044] In one embodiment, referring to Figure 2 The control module (3) comprises: a temperature-controlled switch (Q3), the temperature-controlled switch (Q3) being connected in parallel to both ends of the electric-controlled switch (Q1); wherein the temperature-controlled switch (Q3) is configured to output the second level signal output by the first power supply (1) to the electric-controlled switch (Q1) when the electric-controlled switch (Q1) is closed, so as to keep the electric-controlled switch (Q1) in the closed state; and, in response to the temperature of the heating wire (L) being disconnected when it is higher than the target temperature, the second level signal stops being transmitted to the electric-controlled switch (Q1) when the temperature-controlled switch (Q3) is disconnected, so as to drive the electric-controlled switch (Q1) to disconnect.

[0045] In this embodiment, in order to avoid the over-high temperature of the heating wire (L) causing damage to other electronic components in the circuit where the heating wire (L) is located, in order to ensure that the temperature of the heating wire (L) is within a controllable range, the control module (3) also includes a temperature-controlled switch (Q3), which is a switch that is turned off and on by temperature control. Figure 1 It can be seen that the temperature-controlled switch (Q3) is connected in parallel to the two ends of the electric-controlled switch (Q1), and the electric-controlled switch (Q1) is connected in series with the heating wire (L). Therefore, when the electric-controlled switch (Q1) is closed, the second level signal output by the first power supply (1) can enter the electric-controlled switch (Q1) through the temperature-controlled switch (Q3), driving the electric-controlled switch (Q1) to close. Even if the conduction signal disappears, the electric-controlled switch (Q1) can be maintained in a closed state, so that the first power supply (1) supplies power to the heating wire (L).

[0046] In addition, since the temperature-controlled switch (Q3) is a switch controlled by temperature, a temperature sensor is generally integrated in the temperature-controlled switch (Q3), and the temperature sensor can monitor the temperature of the heating wire (L) in real time. Once the temperature of the heating wire (L) is higher than the target temperature, the temperature-controlled switch (Q3) will be disconnected in response to the temperature of the heating wire (L). At this time, the second level signal output by the first power supply (1) cannot enter the electric control switch (Q1) through the temperature-controlled switch (Q3), and the electric control switch (Q1) is maintained in a closed state. At this time, the electric control switch (Q1) will be disconnected, thereby disconnecting the circuit between the first power supply (1) and the heating wire (L), and the heating wire (L) stops heating.

[0047] In one embodiment, the control module (3) further comprises: a diode (D1); wherein the anode of the diode (D1) is connected to the temperature-controlled switch (Q3), and the cathode of the diode (D1) is connected to one end of the electric-controlled switch (Q1), so as to prevent a reverse induced current from reaching the temperature-controlled switch (Q3) when the electric-controlled switch (Q1) is switched from closed to open.

[0048] In this embodiment, refer to Figure 2 It can be seen that the control module (3) further includes a diode (D1), and the positive electrode of the diode (D1) is connected to the temperature control switch (Q3), and the negative electrode of the diode (D1) is connected to the electric control switch (Q1). When the temperature of the heating wire (L) exceeds the target temperature, the electric control switch (Q1) switches from closed to open, or the driver switches the electric control switch (Q1) from closed to open by himself, a reverse induced current will be generated and reach the temperature control switch (Q3). The current of the induced current may damage the temperature control switch (Q3). Adding a diode (D1) to the control module (3) can protect the temperature control switch (Q3) from being damaged by the impact of the reverse induced current generated by the electric control switch (Q1).

[0049] In one embodiment, the defrost switch (Q2) is a reset switch.

[0050] In this embodiment, the defrost switch (Q2) is a reset switch, which is a switch that closes when the driver mechanically presses it and opens when the driver stops pressing it. In this way, during actual use, the driver only needs to press the defrost switch (Q2) once, which can also achieve the purpose of defrosting, simplify the operation and save time.

[0051] In one embodiment, the temperature control switch (Q3) is a normally closed switch.

[0052] In this embodiment, the temperature control switch (Q3) is a normally closed switch, which is in a closed state when the temperature of the heating wire (L) is lower than the target temperature, and is disconnected only when it is detected that the temperature of the heating wire (L) is higher than the target temperature.

[0053] In one embodiment, a fuse (FU) is further included; wherein the fuse (FU) is connected in series between the first power supply (1) and the electronically controlled switch (Q1).

[0054] In the present embodiment, the rearview mirror defrosting circuit further includes a fuse (FU). Since the first power source (1) for supplying power to the heating wire (L) is generally provided by a vehicle-mounted battery, when the current is just being output, there may be a current that is too large. Therefore, in order to prevent the first power source (1) from outputting an excessive current that damages the electronically controlled switch (Q1), a fuse (FU) is connected in series between the first power source (1) and the electronically controlled switch (Q1) to prevent the first power source (1) from outputting an excessive current that damages the electronically controlled switch (Q1).

[0055] For example, the following will refer to Figure 3 , Figure 3 This is a rearview mirror defrosting circuit diagram provided by the embodiment of the present application, combined with Figure 2 , the rearview mirror defrosting circuit provided in this embodiment is described in detail during use:

[0056] from Figure 3 As can be seen from the figure, the rearview mirror defrosting circuit is composed of a first power supply (1), a second power supply (21), an electric control switch (Q1), a heating wire (L), a defrosting switch (Q2), a resistor R, a light-emitting diode D2, a diode (D1), a temperature control switch (Q3), and a fuse (FU). The voltage output by the first power supply (1) is V1, the voltage output by the second power supply (21) is V2, and the resistor R and the light-emitting diode D2 form a Figure 2 The indicator light (22), the temperature control switch (Q3) and the diode (D1) constitute Figure 1 The control module (3), the second power supply (21), the defrost switch (Q2) and the indicator light (22) are composed of Figure 1 The trigger module (2) in Figure 2 The electronically controlled switch (Q1) in Figure 3 The relay in the temperature control switch (Q3) is a normally closed switch and the defrost switch (Q2) is a reset switch.

[0057] Will Figure 3The provided rearview defrosting circuit is integrated into the rearview mirror of the vehicle. When the driver finds condensed frost on the rearview mirror during driving, the driver can manually press the defrost switch (Q2). At this time, the defrost switch (Q2) is closed, and the first level signal output by the second power supply (21), that is, the current, will flow into the electromagnetic coil of the relay through the defrost switch (Q2). The magnetic field around the electromagnetic coil will change, thereby driving the relay from the disconnected state to the attracted state. At this time, the circuit between the first power supply (1) and the heating wire (L) will be turned on, and the first power supply (1) will supply power to the heating wire (L) so that the heating wire (L) can heat the condensed frost on the rearview mirror. At the same time, Figure 3 It can be seen that the light-emitting diode D2 and the resistor R are connected in series at the other end of the defrost switch (Q2). When the defrost switch (Q2) is closed, the current output by the second power supply (21) will also flow into the light-emitting diode D2 through the defrost switch (Q2), and the light-emitting diode D2 can emit light to inform the driver that the defrost function of the rearview mirror is turned on.

[0058] Since the driver presses the defrost switch (Q2) for only a short time and the defrost switch (Q2) is a reset switch, when the driver stops pressing the mechanical switch, the defrost switch (Q2) will be disconnected, Figure 2 It can be seen that the temperature control switch (Q3) and the diode (D1) are connected in parallel at both ends of the relay. Although the first level signal emitted by the second power supply (21) cannot act on the electromagnetic coil of the relay, the second level signal emitted by the first power supply (1) can act on the electromagnetic coil of the relay through the temperature control switch (Q3) and the diode (D1). At this time, the relay will still remain in the energized state and will not be disconnected due to the disconnection of the defrost switch (Q2). At the same time, the second level signal output by the second power supply (21) will also act on the light-emitting diode D2 through the temperature control switch (Q3) and the diode (D1), and the light-emitting diode D2 will also continue to emit light to inform the driver that the rearview mirror is being defrosted.

[0059] Finally, after the frost condensed on the rearview mirror has been processed, the first power supply (1) will still supply power to the heating wire (L). Since there is no condensed frost to consume the heat generated by the heating wire (L), the heating wire (L) will heat up quickly. However, too high a temperature will damage other electronic components in the circuit where the heating wire (L) is located. Therefore, the temperature control switch (Q3) will detect the temperature of the heating wire (L). When the temperature of the heating wire (L) is higher than the target temperature, it will be disconnected. Then, the second level signal output by the first power supply (1) will not be able to reach the electromagnetic coil of the relay, and the relay will not be able to be controlled to remain in the energized state. At this time, the relay will be converted from the energized state to the disconnected state, and the first power supply (1) will not be able to supply power to the heating wire (L). The heating wire (L) will not heat up. At the same time, no current will flow through the light-emitting diode D2, and the light will stop being emitted. It can also be understood that when the rearview mirror is finished processing the frost condensed on the rearview mirror, the rearview mirror defrost is automatically turned off to protect the rearview mirror, and the driver does not need to pay attention to the status of the rearview mirror, which saves the driver's time so that the driver can concentrate on ensuring safe driving, and can also simplify the driver's operation by only pressing the defrost switch (Q2).

[0060] Based on the same concept, this embodiment provides a rearview mirror, which includes the rearview mirror defrosting circuit as described in this embodiment.

[0061] Based on the same concept, this embodiment provides a vehicle, which includes the rearview mirror as described in the embodiment.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0064] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, article or terminal device including the elements.

[0065] The above is a detailed introduction to a rearview mirror defrost circuit, a rearview mirror and a vehicle provided by the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A rearview mirror defrosting circuit, characterized in that: include: A first power source (1), an electric control switch (Q1), a trigger module (2), a control module (3) and an electric heating wire (L); the first power source (1), the electric control switch (Q1) and the electric heating wire (L) are connected in series in sequence, and the electric control switch (Q1) is electrically connected to the trigger module (2) and the control module (3) respectively; wherein: The trigger module (2) is configured to drive the electric control switch (Q1) to close in response to a conduction signal, so that the first power source (1) supplies power to the heating wire (L); The control module (3) is configured to maintain the closed state of the electric control switch (Q1) when the electric control switch (Q1) is closed, and to drive the electric control switch (Q1) to open when the temperature of the heating wire (L) is higher than the target temperature, so that the first power supply (1) stops supplying power to the heating wire (L).

2. The rearview mirror defrosting circuit according to claim 1, characterized in that: The trigger module (2) comprises: a defrost switch (Q2) and a second power supply (21), wherein a first end of the defrost switch (Q2) is connected to the second power supply (21), and a second end of the defrost switch (Q2) is connected to the electric control switch (Q1); wherein: The second power supply (21) is used to output a first level signal; The defrost switch (Q2) is used to close in response to the conduction signal and to open after the conduction signal disappears; wherein, when the defrost switch (Q2) is closed, the first level signal output by the second power supply (21) drives the electronically controlled switch (Q1) to close.

3. The rearview mirror defrosting circuit according to claim 2, characterized in that: The trigger module (2) further comprises: an indicator light (22), wherein a first end of the indicator light (22) is respectively connected to the electric control switch (Q1), the defrost switch (Q2) and the control module (3), and a second end of the indicator light (22) is connected to a ground end; wherein: The indicator light (22) is used to light up when the first power source (1) supplies power to the heating wire (L).

4. The rearview mirror defrosting circuit according to claim 1, characterized in that: The control module (3) comprises: a temperature control switch (Q3), wherein the temperature control switch (Q3) is connected in parallel to both ends of the electric control switch (Q1); wherein: The temperature-controlled switch (Q3) is configured to output the second level signal output by the first power supply (1) to the electric-controlled switch (Q1) when the electric-controlled switch (Q1) is closed, so as to keep the electric-controlled switch (Q1) in the closed state; And, it is configured to disconnect in response to the temperature of the heating wire (L) being higher than the target temperature. When the temperature-controlled switch (Q3) is disconnected, the second level signal stops being transmitted to the electric control switch (Q1) to drive the electric control switch (Q1) to disconnect.

5. The rearview mirror defrosting circuit according to claim 4, characterized in that: The control module (3) further comprises: a diode (D1); wherein the anode of the diode (D1) is connected to the temperature-controlled switch (Q3), and the cathode of the diode (D1) is connected to one end of the electric-controlled switch (Q1), so as to prevent a reverse induced current from reaching the temperature-controlled switch (Q3) when the electric-controlled switch (Q1) is switched from closed to open.

6. The rearview mirror defrosting circuit according to claim 3, characterized in that: The defrost switch (Q2) is a reset switch.

7. The rearview mirror defrosting circuit according to claim 4 or 5, characterized in that: The temperature control switch (Q3) is a normally closed switch.

8. The rearview mirror defrosting circuit according to claim 1, characterized in that: It also includes a fuse (FU); wherein the fuse (FU) is connected in series between the first power supply (1) and the electronically controlled switch (Q1).

9. A rearview mirror, characterized in that: The rearview mirror comprises a rearview mirror defrosting circuit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle comprises a rearview mirror as claimed in claim 9.

Images