Car window driving protection circuit and car window driving system

Abstract

The invention relates to a car window driving protection circuit and a car window driving system, the car window driving protection circuit comprises a first switch unit, the input end of the first switch unit is used for being connected with a car window driving circuit in series, the output end of the first switch unit is connected with a grounding end, and the power-on state and the power-off state of the car window driving circuit are switched through on-off of the first switch unit; the first detection end is arranged at the input end of the first switch unit, the second detection end is arranged at the output end of the first switch unit, and when the vehicle window driving circuit is in a power-on state, the voltage drop between the first detection end and the second detection end is related to the working current of the vehicle window driving circuit; the first input end of the second switch unit is connected with the first detection end, the second input end of the second switch unit is connected with the second detection end, and the output end of the second switch unit is connected with the control end of the first switch unit; and the second switch unit is used for controlling the on-off of the first switch unit according to the voltage drop between the first detection end and the second detection end.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle window control, and in particular, to a vehicle window drive protection circuit and a vehicle window drive system. Background Art

[0002] With the rapid development of economy and the continuous improvement of people's living standards, the number of vehicles owned by ordinary families and units has been increasing. While enjoying the convenience brought by cars, people also pay great attention to the comfort and safety of vehicles. Among the many parts of the car body, the window is one of the most important components.

[0003] The window motor drives the window to rise and fall by rotating forward and reverse. As a high-power load of the window drive system, if a short circuit occurs in the window motor, a large short-circuit current will be generated in the loop of the window drive circuit. In related technologies, detection is performed by software, which has a long response time and the window drive circuit cannot be shut down in time, which may cause the devices in the window drive circuit to be burned out due to excessive current. Summary of the invention

[0004] The purpose of the present disclosure is to provide a vehicle window driving protection circuit and a vehicle window driving system to solve the problems existing in the related art.

[0005] In order to achieve the above-mentioned object, a first aspect of an embodiment of the present disclosure provides a vehicle window drive protection circuit, wherein the vehicle window drive protection circuit is used to be connected in series with a vehicle window drive circuit, and the vehicle window drive protection circuit comprises:

[0006] a first switch unit, wherein an input end of the first switch unit is connected in series with the vehicle window driving circuit, and an output end of the first switch unit is connected to a ground end, so that the on and off of the first switch unit can switch the power-on state and the power-off state of the vehicle window driving circuit;

[0007] a first detection end and a second detection end, wherein the first detection end is arranged at the input end of the first switch unit, and the second detection end is arranged at the output end of the first switch unit, so that when the window drive circuit is in a powered-on state, a voltage drop between the first detection end and the second detection end is related to an operating current of the window drive circuit;

[0008] A second switch unit, wherein a first input end of the second switch unit is connected to the first detection end, a second input end of the second switch unit is connected to the second detection end, an output end of the second switch unit is connected to a control end of the first switch unit, and the second switch unit is used to control the on and off of the first switch unit through the output end of the second switch unit according to a voltage drop between the first detection end and the second detection end.

[0009] Optionally, the second switch unit includes a first switch circuit and a second switch circuit;

[0010] The first end of the first switch circuit is connected to the first detection end, the second end of the first switch circuit is connected to the second detection end, the third end of the first switch circuit is connected to the first end of the second switch circuit, and the second end of the second switch circuit is connected to the control end of the first switch unit.

[0011] Optionally, the first switch circuit includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a first switch;

[0012] The first end of the first resistor is connected to the first end of the first capacitor, the first end of the first resistor is connected to the first detection end, and the second end of the first resistor is connected to the first end of the first switch;

[0013] The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor, the second end of the first capacitor, and the second end of the first switch are all connected to the second detection end;

[0014] The first end of the third resistor is connected to the third end of the first switch;

[0015] The first end of the fourth resistor is connected to the fourth end of the first switch, and the second end of the third resistor is connected to the second end of the fourth resistor;

[0016] The fifth terminal of the first switch is connected to the second switch circuit;

[0017] The sixth terminal of the first switch is grounded.

[0018] Optionally, the second switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a second switch;

[0019] The first end of the fifth resistor is used to be connected to the first power source, the second end of the fifth resistor is connected to the first end of the second switch, and the second end of the fifth resistor is connected to the second end of the fourth resistor;

[0020] The first end of the sixth resistor is connected to the second end of the second switch;

[0021] The first end of the seventh resistor is connected to the second end of the sixth resistor, the first end of the seventh resistor is connected to the fifth end of the first switch, and the second end of the seventh resistor is grounded;

[0022] The third end of the second switch is used to connect to the first power source;

[0023] The first end of the eighth resistor is connected to the second end of the second switch, and the second end of the eighth resistor is connected to the fourth end of the second switch;

[0024] The first end of the ninth resistor is connected to the second end of the eighth resistor, and the second end of the ninth resistor is grounded;

[0025] The fifth terminal of the second switch is grounded;

[0026] The sixth terminal of the second switch is connected to the control terminal of the first switch unit.

[0027] Optionally, the second switch circuit further includes a tenth resistor and a second capacitor;

[0028] The first end of the tenth resistor is connected to the sixth end of the second switch, and the second end of the tenth resistor is grounded;

[0029] A first end of the second capacitor is connected to the sixth end of the second switch, and a second end of the second capacitor is grounded.

[0030] Optionally, the second switch unit further includes an eleventh resistor;

[0031] The first end of the eleventh resistor is connected to the sixth end of the second switch, and the second end of the eleventh resistor is used to connect to the window controller in the window driving circuit, so that the window controller of the window driving circuit sends a first control signal to the sixth end of the second switch through the eleventh resistor.

[0032] Optionally, the second switch unit further includes a third switch;

[0033] The first end of the third switch is used to connect to the window controller in the window driving circuit, the second end of the third switch is grounded, and the third end of the third switch is connected to the fourth end of the second switch.

[0034] Optionally, the second switch unit further includes a fourth switch;

[0035] A first end of the fourth switch is connected to a first end of the third switch, a second end of the fourth switch is grounded, and a third end of the fourth switch is connected to a fifth end of the first switch.

[0036] Optionally, the second switch unit further includes a twelfth resistor and a third capacitor;

[0037] The first end of the twelfth resistor is connected to the control end of the first switch unit, and the second end of the twelfth resistor is used to connect to the window controller in the window driving circuit, so that the second control signal of the control end of the first switch unit is transmitted to the window controller in the window driving circuit through the twelfth resistor;

[0038] A first end of the third capacitor is connected to a first end of the twelfth resistor, and a second end of the third capacitor is grounded.

[0039] According to a second aspect of an embodiment of the present disclosure, a vehicle window drive system is provided, wherein the vehicle window drive system comprises any one of the vehicle window drive protection circuits provided in the first aspect of the present disclosure, and a vehicle window drive circuit connected in series with the vehicle window drive protection circuit.

[0040] By adopting the above technical solution, by setting a first detection end at the input end of the first switch unit and a second detection end at the output end of the first switch unit, when the window drive circuit is in a power-on state, the voltage drop between the first detection end and the second detection end is related to the current of the window drive circuit, the first input end of the second switch unit is connected to the first detection end, the second input end of the second switch unit is connected to the second detection end, and the output end of the second switch unit is connected to the control end of the first switch unit. The second switch unit is used to control the on and off of the first switch unit through the output end of the second switch unit according to the voltage drop between the first detection end and the second detection end, thereby realizing the on and off control of the window drive circuit connected in series with the first switch unit, and then realizing the shutdown of the window drive circuit by hardware, shortening the response time, and protecting the components in the window drive circuit.

[0041] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0043] Figure 1 It is a block diagram of a vehicle window driving system provided by an embodiment of the present disclosure.

[0044] Figure 2 It is a block diagram of another vehicle window driving system provided by an embodiment of the present disclosure.

[0045] Figure 3 It is a block diagram of another vehicle window driving system provided by an embodiment of the present disclosure.

[0046] Figure 4 is a circuit diagram of a vehicle window driving system provided in an embodiment of the present disclosure.

[0047] Figure 5 Schematic diagram of a vehicle window driving circuit provided in an embodiment of the present disclosure.

[0048] Figure 6 It is a schematic diagram of another vehicle window driving circuit provided in an embodiment of the present disclosure.

[0049] Description of Reference Numerals

[0050] R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor; R10-tenth resistor; R11-eleventh resistor; R12-twelfth resistor; R13-thirteenth resistor; R14-fourteenth resistor; R15-fifteenth resistor; R16-sixteenth resistor; R17-seventeenth resistor; C1-first capacitor; C2-second capacitor; C3-third capacitor; K1-first switch; K2-second switch; K3-third switch; K4-fourth switch; K5-fifth switch; K6-sixth switch; K7-seventh switch; K8-eighth switch; T1-first detection end; T 2-second detection terminal; D1-first diode; D2-second diode; D3-third diode; D4-fourth diode; D5-fifth diode; VCC_1-first power supply; VCC_2-second power supply; VCC_3-third power supply; Output1-first signal output terminal; Output2-second signal output terminal; Output3-third signal output terminal; Output4-fourth signal output terminal; Input-signal input terminal; 10-window drive protection circuit; 110-first switch unit; 120-second switch unit; 121-first switch circuit; 122-second switch circuit; 20-window drive circuit; 21-window controller; 22-motor window drive circuit; 23-window motor. DETAILED DESCRIPTION

[0051] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0052] The terms "first", "second", etc. used in the present disclosure are to distinguish one element from another element and have no order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0053] The window motor 23 drives the window to be raised and lowered by forward and reverse rotation. As a high-power load of the window drive system, if a short circuit occurs in the window motor 23, a large short-circuit current will be generated in the loop of the window drive circuit 20. In the related art, detection is performed by software, which has a long response time and the window drive circuit 20 cannot be shut down in time, which may cause the devices in the window drive circuit 20 to be burned out due to excessive current.

[0054] In order to solve the above technical problems, by setting a first detection terminal T1 at the input end of the first switch unit 110 and a second detection terminal T2 at the output end of the first switch unit 110, when the window drive circuit 20 is in a power-on state, the voltage drop between the first detection terminal T1 and the second detection terminal T2 is related to the current of the window drive circuit 20, the first input end of the second switch unit 120 is connected to the first detection terminal T1, the second input end of the second switch unit 120 is connected to the second detection terminal T2, and the output end of the second switch unit 120 is connected to the control end of the first switch unit 110. The second switch unit 120 is used to control the on and off of the first switch unit 110 through the output end of the second switch unit 120 according to the voltage drop between the first detection terminal T1 and the second detection terminal T2, thereby realizing the on and off control of the window drive circuit 20 connected in series with the first switch unit 110, and then realizing the shutoff of the window drive circuit 20 by hardware, shortening the response time, and protecting the components in the window drive circuit 20.

[0055] The present disclosure provides a vehicle window driving system. Figure 1 and Figure 2 The window drive system includes a window drive protection circuit 10 and a window drive circuit 20, which are connected in series. The window drive protection circuit 10 is used to protect the components in the window drive circuit 20 from being burned when the current is too large. The window drive circuit 20 includes a window controller 21, a motor window drive circuit 22 and a window motor 23, which are connected in sequence, and the window controller 21 is also connected to the window drive protection circuit 10, and the window drive protection circuit 10 is connected to the motor window drive circuit 22.

[0056] See also Figure 4 The motor window driving circuit 22 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a fifth diode D5.

[0057] A first end of the thirteenth resistor R13 is connected to the first signal output end Output1 of the window controller 21, a second end of the thirteenth resistor R13 is connected to a first end of the fifth switch K5, a first end of the fourteenth resistor R14 is connected to a first end of the fifth switch K5, a second end of the fourteenth resistor R14 is grounded, a second end of the fifth switch K5 is connected to a first end of the sixth switch K6, a third end of the fifth switch K5 is grounded, a first end of the first diode D1 is connected to a second end of the fifth switch K5, and a second end of the first diode D1 is grounded.

[0058] The second end of the sixth switch K6 is used to be connected to the second power supply VCC_2, the third end of the sixth switch K6 is connected to the fourth end of the sixth switch K6, and the third end of the sixth switch K6 and the fourth end of the sixth switch K6 are connected to the first end of the window motor 23, the fifth end of the sixth switch K6 is used to be connected to the third power supply VCC_3, and the sixth end of the sixth switch K6 is connected to the window drive protection circuit 10.

[0059] A first end of the fifteenth resistor R15 is connected to the second signal output end Output2 of the window controller 21, a second end of the fifteenth resistor R15 is connected to a first end of the seventh switch K7, a first end of the sixteenth resistor R16 is connected to a first end of the seventh switch K7, a second end of the sixteenth resistor R16 is grounded, a second end of the seventh switch K7 is connected to a first end of the eighth switch K8, a third end of the seventh switch K7 is grounded, a first end of the second diode D2 is connected to a second end of the seventh switch K7, and a second end of the second diode D2 is grounded.

[0060] The second end of the eighth switch K8 is used to be connected to the second power supply VCC_2, the third end of the eighth switch K8 is connected to the fourth end of the eighth switch K8, and the third end of the eighth switch K8 and the fourth end of the eighth switch K8 are connected to the second end of the window motor 23, the fifth end of the eighth switch K8 is used to be connected to the third power supply VCC_3, and the sixth end of the eighth switch K8 is connected to the window drive protection circuit 10.

[0061] A first end of the third diode D3 is connected to a first end of the window motor 23, a second end of the third diode D3 is grounded, a first end of the fourth diode D4 is connected to a second end of the window motor 23, a second end of the fourth diode D4 is grounded, a first end of the fifth diode D5 is connected to a first end of the window motor 23, and a second end of the fifth diode D5 is connected to a second end of the window motor 23.

[0062] The ground terminal may be connected to the ground through a grounding resistor, namely, the seventeenth resistor.

[0063] The window controller may be a MCU (Microcontroller Unit).

[0064] The resistance values ​​of the thirteenth resistor R13 , the fourteenth resistor R14 , the fifteenth resistor R15 , and the sixteenth resistor R16 may be the same, for example, 10 kΩ.

[0065] The fifth switch K5 and the seventh switch K7 may be field effect transistors, for example, field effect transistors of model 2N7002BK. The first end of the fifth switch K5 and the first end of the seventh switch K7 both correspond to the gate of the field effect transistor, the second end of the fifth switch K5 and the second end of the seventh switch K7 both correspond to the drain of the field effect transistor, and the third end of the fifth switch K5 and the third end of the seventh switch K7 both correspond to the source of the field effect transistor.

[0066] In other embodiments, the fifth switch K5 and the seventh switch K7 may also be designed to be integrated together, and their corresponding connection relationship remains unchanged.

[0067] The first diode D1 and the second diode D2 may be single-channel voltage regulator diodes, for example, diodes with model BZX384-B36. The third diode D3 and the fourth diode D4 may be diodes with model FM4007. The fifth diode D5 may be a bidirectional transient suppression diode, for example, a diode with model SMDJ36CA.

[0068] The sixth switch K6 and the eighth switch K8 may be relays, for example, relays of model G8G-1SV. The second power source VCC_2 may be 12V or 24V direct current, and the third power source VCC_3 may be 12V or 24V direct current.

[0069] In the sixth switch K6 and the eighth switch K8, the first end and the second end are connected through an inductor. When the first end and the second end are not energized, the third end, the fourth end, and the sixth end are connected together. When the first end and the second end are energized, the third end, the fourth end, and the fifth end are connected together.

[0070] Working principle of the forward rotation of the window motor 23:

[0071] See also Figure 5, the window controller 21 outputs a high level through the first signal output terminal Output1, and then after voltage division by the thirteenth resistor R13 and the fourteenth resistor R14, the voltage drop across the fourteenth resistor R14 is greater than the start threshold of the fifth switch K5, the fifth switch K5 is turned on, and the second power supply VCC_2 passes through the second end of the sixth switch K6, the first end of the sixth switch K6, the fifth switch K5 in sequence, and then connects to the ground to form a path, so that the first end and the second end of the sixth switch K6 are energized, and the third end, the fourth end, and the fifth end of the sixth switch K6 are connected together. The second signal output terminal Output2 does not need to be given a signal, the seventh switch K7 is turned off, so that the first end and the second end of the eighth switch K8 are not energized, and the third end, the fourth end, and the sixth end of the eighth switch K8 are connected together.

[0072] The third power supply VCC_3 passes through the fifth end of the sixth switch K6, the third end and the fourth end of the sixth switch K6, the first end of the window motor 23, the second end of the window motor 23, the third end and the fourth end of the eighth switch K8, the sixth end of the eighth switch K8, and the first switch unit 110 of the window drive protection circuit 10 to the ground end, forming a closed loop for the forward rotation of the window motor 23.

[0073] Working principle of the window motor 23 reverse rotation:

[0074] See also Figure 6 , the window controller 21 outputs a high level through the second signal output terminal Output2, and then after voltage division by the fifteenth resistor R15 and the sixteenth resistor R16, the voltage drop across the sixteenth resistor R16 is greater than the start threshold of the seventh switch K7, the seventh switch K7 is turned on, and the second power supply VCC_2 passes through the second end of the eighth switch K8, the first end of the eighth switch K8, and the seventh switch K7 in sequence, and then connects to the ground to form a path, so that the first end and the second end of the eighth switch K8 are energized, and the third end, the fourth end, and the fifth end of the eighth switch K8 are connected together. The first signal output terminal Output1 does not need to be given a signal, the fifth switch K5 is disconnected, so that the first end and the second end of the sixth switch K6 are not energized, and the third end, the fourth end, and the sixth end of the sixth switch K6 are connected together.

[0075] The third power supply VCC_3 passes through the fifth end of the eighth switch K8, the third end and the fourth end of the eighth switch K8, the second end of the window motor 23, the first end of the window motor 23, the third end and the fourth end of the sixth switch K6, the sixth end of the sixth switch K6, and the first switch unit 110 of the window drive protection circuit 10 to the ground end, forming a closed loop for the reversal of the window motor 23.

[0076] See also Figure 3The vehicle window driving protection circuit 10 includes a first switch unit 110 , a first detection terminal T1 , a second detection terminal T2 and a second switch unit 120 .

[0077] The first switch unit 110 has an input end connected in series with the window drive circuit 20 , and an output end connected to the ground end, so that the on and off of the first switch unit 110 can switch the power-on state and the power-off state of the window drive circuit 20 .

[0078] The on and off state of the first switch unit 110 can switch the power-on state and the power-off state of the window drive circuit 20. It can be understood that since the first switch unit 110 is connected in series with the window drive circuit 20, the on and off state of the first switch unit 110 can directly affect the on and off state of the window drive circuit 20. If the first switch unit 110 is in the on state, the window drive circuit 20 can be in the power-on state, and if the first switch unit 110 is in the off state, the window drive circuit 20 is in the power-off state.

[0079] A first detection terminal T1 and a second detection terminal T2, the first detection terminal T1 is arranged at the input terminal of the first switch unit 110, and the second detection terminal T2 is arranged at the output terminal of the first switch unit 110, so that when the window drive circuit 20 is in a power-on state, the voltage drop between the first detection terminal T1 and the second detection terminal T2 is related to the working current of the window drive circuit 20.

[0080] There is an on-resistance in the first switch unit 110. When the window drive circuit 20 is in the power-on state, if the first switch unit 110 is turned on, the third power supply VCC_3, the window drive circuit 20, the first switch unit 110, and the ground terminal form a closed loop, and current flows through the first switch unit 110. The current and the on-resistance will cause a voltage drop to be formed between the input terminal and the output terminal of the first switch unit 110, that is, the voltage drop between the first detection terminal T1 and the second detection terminal T2. The magnitude of the voltage drop is positively correlated with the current flowing through the first switch unit 110. Since the first switch unit 110 is connected in series with the window drive circuit 20, that is, the current flowing through the first switch unit 110 is equal to the working current of the window drive circuit 20, the voltage drop between the first detection terminal T1 and the second detection terminal T2 is positively correlated with the working current of the window drive circuit 20.

[0081] The second switch unit 120, the first input end of the second switch unit 120 is connected to the first detection end T1, the second input end of the second switch unit 120 is connected to the second detection end T2, the output end of the second switch unit 120 is connected to the control end of the first switch unit 110, and the second switch unit 120 is used to control the on and off of the first switch unit 110 through the output end of the second switch unit 120 according to the voltage drop between the first detection end T1 and the second detection end T2.

[0082] The second switch unit 120 obtains an output level according to the voltage drop between the first detection terminal T1 and the second detection terminal T2, and the output level is transmitted to the control terminal of the first switch unit 110 through the output terminal of the second switch unit 120 to realize on-off control of the first switch unit 110.

[0083] The first switch unit 110 may be a field effect tube, for example, a field effect tube of model IPD70N10S3L-12. The input end of the first switch unit 110 corresponds to the drain of the field effect tube, the output end of the first switch unit 110 corresponds to the source of the field effect tube, and the control end of the first switch unit 110 corresponds to the gate of the field effect tube.

[0084] By adopting the above technical solution, by setting the first detection terminal T1 at the input terminal of the first switch unit 110 and the second detection terminal T2 at the output terminal of the first switch unit 110, when the window drive circuit 20 is in the power-on state, the voltage drop between the first detection terminal T1 and the second detection terminal T2 is related to the current of the window drive circuit 20, the first input terminal of the second switch unit 120 is connected to the first detection terminal T1, the second input terminal of the second switch unit 120 is connected to the second detection terminal T2, and the output terminal of the second switch unit 120 is connected to the control terminal of the first switch unit 110. The second switch unit 120 is used to control the on-off of the first switch unit 110 through the output terminal of the second switch unit 120 according to the voltage drop between the first detection terminal T1 and the second detection terminal T2, thereby realizing the on-off control of the window drive circuit 20 connected in series with the first switch unit 110, and then realizing the shut-off of the window drive circuit 20 by hardware, thereby shortening the response time and protecting the components in the window drive circuit 20.

[0085] In a possible implementation, the second switch unit 120 includes a first switch circuit 121 and a second switch circuit 122;

[0086] The first end of the first switch circuit 121 is connected to the first detection end T1, the second end of the first switch circuit 121 is connected to the second detection end T2, the third end of the first switch circuit 121 is connected to the first end of the second switch circuit 122, and the second end of the second switch circuit 122 is connected to the control end of the first switch unit 110.

[0087] The first end and the second end of the first switch circuit 121 serve as input ends of the first switch circuit 121 , and the third end of the first switch circuit 121 is the output end of the first switch circuit 121 . The output of the first switch circuit 121 affects the output of the second switch circuit 122 , thereby affecting the on-off state of the first switch unit 110 .

[0088] In a possible implementation, the first switch circuit 121 includes a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first switch K1;

[0089] The first end of the first resistor R1 is connected to the first end of the first capacitor C1, the first end of the first resistor R1 is connected to the first detection terminal T1, and the second end of the first resistor R1 is connected to the first end of the first switch K1;

[0090] The first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2, the second end of the first capacitor C1, and the second end of the first switch K1 are all connected to the second detection terminal T2;

[0091] A first end of the third resistor R3 is connected to a third end of the first switch K1;

[0092] A first end of the fourth resistor R4 is connected to a fourth end of the first switch K1, and a second end of the third resistor R3 is connected to a second end of the fourth resistor R4;

[0093] The fifth terminal of the first switch K1 is connected to the second switch circuit 122;

[0094] A sixth terminal of the first switch K1 is grounded.

[0095] The resistance value of the first resistor R1 may be 10 kΩ, the resistance value of the second resistor R2 may be 47 kΩ, the resistance value of the third resistor R3 may be 10 kΩ, and the resistance value of the fourth resistor R4 may be 4.7 kΩ.

[0096] The first switch K1 may be a transistor, for example, a transistor of type BC817DS.

[0097] The voltage drop between the first detection terminal T1 and the second detection terminal T2 is input to the first switch circuit 121. After voltage division by the first resistor R1 and the second resistor R2 in the first switch circuit 121, if the voltage drop across the second resistor R2 is greater than the start threshold of the first switch K1, the first switch K1 is turned on.

[0098] In a possible implementation, the second switch circuit 122 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a second switch K2;

[0099] A first end of the fifth resistor R5 is connected to the first power source VCC_1, a second end of the fifth resistor R5 is connected to the first end of the second switch K2, and a second end of the fifth resistor R5 is connected to the second end of the fourth resistor R4;

[0100] A first end of the sixth resistor R6 is connected to a second end of the second switch K2;

[0101] A first end of the seventh resistor R7 is connected to the second end of the sixth resistor R6, and a first end of the seventh resistor R7 is connected to the fifth end of the first switch K1, and a second end of the seventh resistor R7 is grounded;

[0102] The third end of the second switch K2 is used to be connected to the first power source VCC_1;

[0103] A first end of the eighth resistor R8 is connected to the second end of the second switch K2, and a second end of the eighth resistor R8 is connected to the fourth end of the second switch K2;

[0104] A first end of the ninth resistor R9 is connected to the second end of the eighth resistor R8, and a second end of the ninth resistor R9 is grounded;

[0105] The fifth terminal of the second switch K2 is grounded;

[0106] The sixth terminal of the second switch K2 is connected to the control terminal of the first switch unit 110 .

[0107] The resistance value of the fifth resistor R5 may be 47 kΩ, the resistance value of the sixth resistor R6 may be 4.7 kΩ, the resistance value of the seventh resistor R7 may be 47 kΩ, the resistance value of the eighth resistor R8 may be 10 kΩ, and the resistance value of the ninth resistor R9 may be 10 kΩ.

[0108] The second switch K2 may be a dual transistor, for example, a transistor of model BC817DPN. The first power source VCC_1 may be a 24V direct current.

[0109] The first power supply VCC_1 passes through the fifth resistor R5, the third resistor R3, the first switch K1, and the second detection terminal T2 in sequence to form a path. After the fifth resistor R5 and the third resistor R3 divide the voltage, the voltage at the second end of the fifth resistor R5 turns on the left transistor of the second switch K2. The first power supply VCC_1 passes through the left transistor of the second switch K2, the sixth resistor R6, and the seventh resistor R7 in sequence to be connected to the ground to form a path.

[0110] The first power source VCC_1 is connected to the ground via the left triode of the second switch K2, the eighth resistor R8, and the ninth resistor R9 to form a path, and the voltage division at the second end of the eighth resistor R8 and the first end of the ninth resistor R9 is used to control the right triode of the second switch K2. When the left triode of the second switch K2 is turned on, the voltage division at the second end of the eighth resistor R8 and the first end of the ninth resistor R9 can turn on the right triode of the second switch K2, and the sixth end of the second switch K2 and the fifth end of the second switch K2 are turned on. The voltage at the sixth end of the second switch K2 is affected by the voltage at the fifth end of the second switch K2, and is thus set low (close to zero), so that the control end of the first switch unit 110 connected to the sixth end of the second switch K2 is also set low, and the first switch unit 110 is disconnected, so as to realize the shut-down of the window drive circuit 20 by hardware.

[0111] The sixth resistor R6 and the seventh resistor R7 divide the voltage and are connected to the first switch K1. When the window drive circuit 20 is short-circuited and the current is too large, a dynamic balance is formed between the left transistor of the second switch K2 and the first switch K1, and the hardware shutdown state is maintained.

[0112] In a possible implementation manner, the second switch circuit 122 further includes a tenth resistor R10 and a second capacitor C2;

[0113] A first end of the tenth resistor R10 is connected to the sixth end of the second switch K2, and a second end of the tenth resistor R10 is grounded;

[0114] A first end of the second capacitor C2 is connected to the sixth end of the second switch K2, and a second end of the second capacitor C2 is grounded.

[0115] The resistance value of the tenth resistor R10 may be 10 kΩ.

[0116] The output signal of the sixth terminal of the second switch K2 can be filtered by connecting the tenth resistor R10 and the second capacitor C2 to the ground in parallel.

[0117] In a possible implementation manner, the second switch unit 120 further includes an eleventh resistor R11;

[0118] A first end of the eleventh resistor R11 is connected to the sixth end of the second switch K2, and a second end of the eleventh resistor R11 is used to be connected to the window controller 21 in the window drive circuit 20, so that the window controller 21 of the window drive circuit 20 sends a first control signal to the sixth end of the second switch K2 through the eleventh resistor R11.

[0119] The resistance value of the eleventh resistor R11 may be 1 kΩ.

[0120] The second end of the eleventh resistor R11 is used to be connected to the third signal output terminal Output3 of the window controller 21. The window controller 21 sends a first control signal to the sixth end of the second switch K2 (which is also the control end of the first switch unit 110) through the third signal output terminal Output3 and the eleventh resistor R11. The first control signal is high level, so that the first switch unit 110 is turned on and the window drive circuit 20 is turned on. In the process of the window control system normally controlling the lifting and lowering of the window, the third signal output terminal Output3 of the window controller 21 needs to send the first control signal to enable the normal operation of the drive system.

[0121] In a possible implementation, after the first switch unit 110 is turned off by hardware, if recovery is required, the first switch unit 110 is turned on again, and the second switch unit 120 further includes a third switch K3;

[0122] A first end of the third switch K3 is used to connect to the window controller 21 in the window driving circuit 20 , a second end of the third switch K3 is grounded, and a third end of the third switch K3 is connected to a fourth end of the second switch K2 .

[0123] The third switch K3 may be a transistor, for example, a transistor of model PDTC123JU. The first end of the third switch K3 corresponds to the base of the transistor, the second end of the third switch K3 corresponds to the emitter of the transistor, and the third end of the third switch K3 corresponds to the collector of the transistor.

[0124] The first end of the third switch K3 is used to connect to the fourth signal output terminal Output4 of the window controller 21. The window controller 21 inputs a high level to the first end of the third switch K3 through the fourth signal output terminal Output4, so that the third switch K3 is turned on. The voltage of the third end of the third switch K3 is affected by the voltage of the second end of the third switch K3, so that it is set low (close to zero), thereby making the fourth end of the second switch K2 also low, and the right transistor of the second switch K2 is disconnected. The window controller 21 of the window drive circuit 20 sends the first control signal to the sixth end of the second switch K2 through the eleventh resistor R11, so that the first switch unit 110 is turned on, and the window drive circuit 20 is turned on.

[0125] In a possible implementation, the second switch unit 120 further includes a fourth switch K4;

[0126] A first end of the fourth switch K4 is connected to a first end of the third switch K3 , a second end of the fourth switch K4 is grounded, and a third end of the fourth switch K4 is connected to a fifth end of the first switch K1 .

[0127] The fourth switch K4 may be a transistor, for example, a transistor of model PDTC123JU. A first terminal of the fourth switch K4 corresponds to a base of the transistor, a second terminal of the fourth switch K4 corresponds to an emitter of the transistor, and a third terminal of the fourth switch K4 corresponds to a collector of the transistor.

[0128] The first end of the fourth switch K4 is used to be connected to the fourth signal output end Output4 of the window controller 21. The window controller 21 inputs a high level to the first end of the fourth switch K4 through the fourth signal output end Output4, so that the fourth switch K4 is turned on. The voltage at the third end of the fourth switch K4 is affected by the voltage at the second end of the fourth switch K4, and is thus set low (close to zero), thereby causing the fifth end of the first switch K1 to be set low as well. The first switch K1 is disconnected, breaking the dynamic balance between the left triode of the second switch K2 and the first switch K1.

[0129] In a possible implementation, the second switch unit 120 further includes a twelfth resistor R12 and a third capacitor C3;

[0130] A first end of the twelfth resistor R12 is connected to the control end of the first switch unit 110, and a second end of the twelfth resistor R12 is used to be connected to the window controller 21 in the window driving circuit 20, so that a second control signal from the control end of the first switch unit 110 is transmitted to the window controller 21 in the window driving circuit 20 through the twelfth resistor R12;

[0131] A first end of the third capacitor C3 is connected to the first end of the twelfth resistor R12, and a second end of the third capacitor C3 is grounded.

[0132] The resistance value of the twelfth resistor R12 may be 10 kΩ.

[0133] The second end of the twelfth resistor R12 is used to be connected to the signal input end Input of the window controller 21 . The signal at the control end of the first switch unit 110 , ie, the second control signal, can be transmitted to the window controller 21 through the signal input end Input.

[0134] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0135] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0136] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle window drive protection circuit, characterized in that: The vehicle window driving protection circuit is used to be connected in series with the vehicle window driving circuit, and the vehicle window driving protection circuit comprises: a first switch unit, wherein an input end of the first switch unit is connected in series with the vehicle window driving circuit, and an output end of the first switch unit is connected to a ground end, so that the on and off of the first switch unit can switch the power-on state and the power-off state of the vehicle window driving circuit; a first detection end and a second detection end, wherein the first detection end is arranged at the input end of the first switch unit, and the second detection end is arranged at the output end of the first switch unit, so that when the window drive circuit is in a powered-on state, a voltage drop between the first detection end and the second detection end is related to an operating current of the window drive circuit; A second switch unit, wherein a first input end of the second switch unit is connected to the first detection end, a second input end of the second switch unit is connected to the second detection end, an output end of the second switch unit is connected to a control end of the first switch unit, and the second switch unit is used to control the on and off of the first switch unit through the output end of the second switch unit according to a voltage drop between the first detection end and the second detection end.

2. The vehicle window drive protection circuit according to claim 1, characterized in that: The second switch unit includes a first switch circuit and a second switch circuit; The first end of the first switch circuit is connected to the first detection end, the second end of the first switch circuit is connected to the second detection end, the third end of the first switch circuit is connected to the first end of the second switch circuit, and the second end of the second switch circuit is connected to the control end of the first switch unit.

3. The vehicle window drive protection circuit according to claim 2, characterized in that: The first switch circuit includes a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a first switch; The first end of the first resistor is connected to the first end of the first capacitor, the first end of the first resistor is connected to the first detection end, and the second end of the first resistor is connected to the first end of the first switch; The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor, the second end of the first capacitor, and the second end of the first switch are all connected to the second detection end; The first end of the third resistor is connected to the third end of the first switch; The first end of the fourth resistor is connected to the fourth end of the first switch, and the second end of the third resistor is connected to the second end of the fourth resistor; The fifth terminal of the first switch is connected to the second switch circuit; The sixth terminal of the first switch is grounded.

4. The vehicle window drive protection circuit according to claim 3, characterized in that: The second switch circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a second switch; The first end of the fifth resistor is used to be connected to the first power source, the second end of the fifth resistor is connected to the first end of the second switch, and the second end of the fifth resistor is connected to the second end of the fourth resistor; The first end of the sixth resistor is connected to the second end of the second switch; The first end of the seventh resistor is connected to the second end of the sixth resistor, the first end of the seventh resistor is connected to the fifth end of the first switch, and the second end of the seventh resistor is grounded; The third end of the second switch is used to connect to the first power source; The first end of the eighth resistor is connected to the second end of the second switch, and the second end of the eighth resistor is connected to the fourth end of the second switch; The first end of the ninth resistor is connected to the second end of the eighth resistor, and the second end of the ninth resistor is grounded; The fifth terminal of the second switch is grounded; The sixth terminal of the second switch is connected to the control terminal of the first switch unit.

5. The vehicle window drive protection circuit according to claim 4, characterized in that: The second switch circuit further includes a tenth resistor and a second capacitor; The first end of the tenth resistor is connected to the sixth end of the second switch, and the second end of the tenth resistor is grounded; A first end of the second capacitor is connected to the sixth end of the second switch, and a second end of the second capacitor is grounded.

6. The vehicle window drive protection circuit according to claim 4 or 5, characterized in that: The second switch unit further includes an eleventh resistor; The first end of the eleventh resistor is connected to the sixth end of the second switch, and the second end of the eleventh resistor is used to connect to the window controller in the window driving circuit, so that the window controller of the window driving circuit sends a first control signal to the sixth end of the second switch through the eleventh resistor.

7. The vehicle window driving protection circuit according to claim 6, characterized in that: The second switch unit further includes a third switch; The first end of the third switch is used to connect to the window controller in the window driving circuit, the second end of the third switch is grounded, and the third end of the third switch is connected to the fourth end of the second switch.

8. The vehicle window driving protection circuit according to claim 7, characterized in that: The second switch unit further includes a fourth switch; A first end of the fourth switch is connected to a first end of the third switch, a second end of the fourth switch is grounded, and a third end of the fourth switch is connected to a fifth end of the first switch.

9. The vehicle window driving protection circuit according to claim 6, characterized in that: The second switch unit further includes a twelfth resistor and a third capacitor; The first end of the twelfth resistor is connected to the control end of the first switch unit, and the second end of the twelfth resistor is used to connect to the window controller in the window driving circuit, so that the second control signal of the control end of the first switch unit is transmitted to the window controller in the window driving circuit through the twelfth resistor; A first end of the third capacitor is connected to a first end of the twelfth resistor, and a second end of the third capacitor is grounded.

10. A vehicle window driving system, characterized in that: The vehicle window driving system comprises the vehicle window driving protection circuit according to any one of claims 1 to 9, and a vehicle window driving circuit connected in series with the vehicle window driving protection circuit.

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