Chipless one-key drop electric vehicle window switch circuit

Abstract

The application relates to a chip-free one-key descending electric vehicle window switch circuit, characterized by comprising a motor, a diode D4, a coil L3, a coil L4, a switch SW3 and a switch SW4, wherein the coil L4 and the coil L3 are connected at the cathode of the diode D4, the anode of the diode D4, the third end of the switch SW4 and the third end of the switch SW3 are connected on a VBAT pin, the second end of the switch SW4 and the second end of the switch SW3 are connected with the motor, and the first end of the switch SW3 is grounded; the chip-free one-key descending electric vehicle window switch circuit further comprises an automatic descending module, a manual descending button module, a manual ascending button module, a descending locked-rotor current detection module and a descending protection and time-delay protection module. By adopting the technical scheme, the chip-free one-key descending electric vehicle window switch circuit provided by the application does not need a chip, uses common devices for design replacement, does not need to modify a circuit board and a program, reduces cost, and reduces dependence on the chip.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of car window switch, in particular to a one-key descending electric car window switch circuit without chip. BACKGROUND

[0002] The electric car window switch is a necessary product for controlling the lifting function of the car window glass, which generally realizes manual lifting, manual descending and automatic descending functions, wherein the automatic descending function is to automatically lower the glass car window to the lowest position when the automatic descending gear is pressed, which involves the realization of logic function control, and the commonly used microcontroller chip (MCU) or operational amplifier chip is used to realize the function.

[0003] The Chinese utility model patent with the authorized announcement number CN208380384U discloses a car window glass lifting and descending drive control circuit, which comprises a motor drive circuit, an ascending signal input end, a descending signal input end, a one-key descending signal input end and a timing circuit. The motor drive circuit is used for driving the motor to rotate forward and reverse, so as to drive the car window glass to ascend or descend. The forward rotation control end of the motor drive circuit is connected with the ascending signal input end, the reverse rotation control end of the motor drive circuit is connected with the descending signal input end, the input end of the timing circuit is connected with the one-key descending signal input end, the output end of the timing circuit is connected with the reverse rotation control end of the motor drive circuit, and the timing circuit is used for converting the one-key descending signal into a descending signal with a continuous setting time length and outputting the descending signal. The patent needs to realize the function through an operational amplifier.

[0004] The Chinese utility model patent with the authorized announcement number CN201945832U is controlled through an MCU processor, and the voltage of the car battery needs to be stabilized to the working voltage required by the MCU processor, so that the circuit module is more, the circuit is complex, and the cost is high.

[0005] The existing one-key descending function needs to realize the function through a power supply chip and a microcontroller chip (MCU) or an operational amplifier chip, at least two chips are used, the chip is a large-scale integrated circuit, the commonality is low, and if the chip is replaced, the circuit board design modification and the microcontroller chip program modification need to be performed again. SUMMARY

[0006] The present application relates to the technical field of car window switch, in particular to a one-key descending electric car window switch circuit without chip.

[0007] The technical scheme of the present application: a chip-free one-key descending electric vehicle window switch circuit, comprising a motor, a diode D4, a coil L3, a coil L4, a switch SW3 and a switch SW4, wherein the coil L4 and the coil L3 are connected to the cathode of the diode D4, the anode of the diode D4, the third end of the switch SW4 and the third end of the switch SW3 are connected to the VBAT pin, the second end of the switch SW4 and the second end of the switch SW3 are connected to the motor, and the first end of the switch SW3 is grounded.

[0008] Further comprising,

[0009] The automatic descending module comprises a KEY4 and a resistor R17, the first end of the KEY4 is connected to the cathode of the diode D4, and the second end is connected to the resistor R17.

[0010] The manual descending button module comprises a KEY5, a resistor R20 and a triode Q9, the first end of the KEY5 is connected to the cathode of the diode D4, the second end is connected to the resistor R20, the resistor R20 is connected to the base of the triode Q9, the emitter of the triode Q9 is grounded, and the collector is connected to the coil L3.

[0011] The manual ascending button module comprises a KEY6, a resistor R21 and a triode Q10, the first end of the KEY6 is connected to the cathode of the diode D4, the second end is connected to the resistor R21, the resistor R21 is connected to the base of the triode Q10, the emitter of the triode Q10 is grounded, and the collector is connected to the coil L4.

[0012] The descending stall current detection module comprises a triode Q7, a resistor R18, a resistor R19, a resistor R22 and a capacitor C1, the resistor R18 is connected to the base of the triode Q7 and the resistor R19, the resistor R19 is connected to the resistor R22, one end of the capacitor C1 is connected between the resistor R18 and the resistor R19, the emitter of the triode Q7, the capacitor C1 and the resistor R22 are grounded, and the first end of the switch SW4 is connected to the resistor R22.

[0013] The down protection and delay protection module comprises a transistor Q8, a transistor Q6, a transistor Q11, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R23, a resistor R24, a capacitor C3, a diode D3 and a diode D6, the collector of the transistor Q6 is connected with the resistor R16, the emitter is connected with the collector of the transistor Q11, the base is connected with the resistor R15, the emitter of the transistor Q11 is grounded, the collector of the transistor Q8 is connected with the anode of the diode D3, the emitter is connected with the cathode of the diode D4, the base of the transistor Q11 is connected with the resistor R24, the cathode of the diode D3 is connected with the resistor R20, one end of the resistor R24 and one end of the capacitor C3 are connected with the resistor R23, the other end of the capacitor C3 is grounded, the resistor R23 is connected with the resistor R17, the resistor R16 is connected with the base of the transistor Q8, the resistor R14 is connected with the resistor R15 and the emitter of the transistor Q6 respectively, the resistor R15 is connected with the resistor R13 on the collector of the transistor Q7, the collector of the transistor Q7 is connected with the cathode of the diode D6, the anode of the diode D6 is connected with the resistor R17.

[0014] By using the above technical scheme, 1. The blocking current detection of one-key down is realized by the cooperation of the transistor and the sampling resistor, and the current is not detected by using the operational amplifier chip;

[0015] When the manual up is performed, the KEY6 is closed and conducted, the resistor R21, the collector and the emitter of the transistor Q10 are conducted, the relay coil L4 is operated, the upper contact of the SW4 is closed, the motor M obtains the power supply, and the window motor is rotated to drive the window glass to be up. At this time, the current passing through the lower contact of the SW3 to the ground does not pass through the sampling resistor R22, so the current does not need to be detected when the manual up is performed, and the manual up operation is not affected. When the manual down is performed, the KEY5 is pressed, the resistor R20 and the transistor Q9 make the L3 obtain the power supply, the upper contact of the SW3 is connected, the current passes through the lower contact of the SW4 and the resistor R22, when the voltage on the resistor R22 is increased, the voltage on the resistor R22 charges the C1 through the resistor R19, when the voltage of the C1 is charged to be greater than the base and the emitter conduction voltage of the transistor Q7, the collector and the emitter voltage of the transistor Q7 are triggered through the resistor R18, so that whether the current exceeds the blocking current value can be detected. When the motor is normally rotated, the current value is less than half of the blocking current, so whether the window is blocked to the bottom can be identified by the down blocking current detection part, and the operational amplifier chip or the analog-digital conversion chip is not needed, and the voltage stabilizing chip is not needed to supply power for the operational amplifier chip or the analog-digital conversion chip.

[0016] 2. The down holding and delay protection is realized by the transistor, the logic holding of one-key down is realized, the automatic control driving relay is executed to continuously down, and the automatic stop can be performed after a certain time delay, so that the long-time idling of the motor caused by the mechanical failure of the window is avoided. In this way, the micro control chip or the program is not needed for the logic control.

[0017] When the KEY4 key is pressed, the voltage is divided by R17, D6, R15, R14 and applied to the base and emitter of Q6, and the collector and emitter of Q6 is thus turned on, so that the current flows through R16 and the base and emitter of Q8. Another part of R23 charges C3, and the voltage on C3 rises rapidly, and the voltage is applied to the base and emitter of Q11, so that the collector and emitter of Q11 is turned on. At this point, Q11 provides working current to the base of Q8 through Q6 and R16, and Q8 is turned on. After Q8 is turned on, the collector of Q8 provides working current to R20 and Q9 through D3, and L3 obtains power supply, SW3 is closed, and the motor obtains power and is lowered. At the same time, after Q8 is turned on, R13 provides voltage to R15, so that Q6 and Q8 are self-locked and continuously maintained in the on state. The one-key lowering is maintained, and even if KEY4 and KEY5 are released, the lowering can continue.

[0018] When KEY5 and KEY4 are released, the electrical energy stored in C3 is discharged through the connected devices. When the voltage of C3 drops to a level that is insufficient to maintain Q11 in the on state, Q6 and Q8 are turned off, and after the collector of Q8 has no voltage, R20 and Q9 have no voltage, Q9 is turned off, L3 has no power supply, and the automatic lowering of the window is stopped. D6 prevents Q8 from charging C3 through R13, D15, R17, and R23 when Q8 is turned on, ensuring that the electrical energy in C3 decreases after KEY5 and KEY4 are released, and playing a time delay protection role.

[0019] 3. The detection signal provided by the stall current terminates the operation of the self-locking circuit, stops the driving of the relay, and makes the window motor no longer stall;

[0020] When the automatic lowering is at the bottom, the stall current detection detects the stall condition, the current of resistor R22 increases due to the stall, and the voltage acting on the base of Q7 through resistors R19, C1, and R18 makes the voltage at the connection position of R15 and R13 and D6 drop to a level close to 0V. Q6 is thus unable to obtain current to turn on the base and emitter and is turned off, and R16 and Q8 are turned off. After Q8 is turned off, D3, R20, and Q9 have no working voltage, L3 has no power supply, SW3 is opened, the window motor does not work, and the stall is terminated.

[0021] 4. The manual lowering signal and the automatic lowering signal work together to avoid overcurrent triggering to terminate the lowering and maintain the work during the starting moment;

[0022] The mechanical structure ensures that KEY4 is pressed when KEY5 is also pressed, and the initial state of automatic descent is powered by KEY5 to R20, Q9, and the starting moment overcurrent is detected to make Q8 off and D3 without current, but KEY5 is still in the on state to provide working current to R20, Q9, avoiding failure to descend.

[0023] 5. The automatic descent self-locking circuit is terminated by the manual up signal and the one-key descent process is stopped at any time.

[0024] When the one-key descent trigger enters the automatic descent working state and before descending to the bottom and stopping automatically, the manual up KEY6 is operated, R12 flows through the current, C1 is charged, C1 is charged to the Q7 on voltage, R18 provides working current to the base and emitter of Q7, the collector of Q7 is turned on to the voltage level close to ground, the signal of the descent overcurrent detection is sent to R15, Q6 and Q8 are off, D3 and R20 are without electricity, Q9 is off, L3 is without electricity, SW3 is disconnected, and the automatic descent is ended.

[0025] The application proposes a method for realizing manual up, manual down, one-key descent, and automatic stop of the motor after one-key descent to protect the motor and terminating the one-key descent function by triggering the manual up operation in the one-key descent process without using a chip, compared with the prior art, the circuit is simple, common general-purpose components are used, the components on the circuit have wider supply channels for flexible replacement, and the chip is broken in the field of electric window switch with one-key descent function. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The schematic diagram of the specific embodiment of the application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0028] In addition, the technical solutions of the various embodiments of the application can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the application.

[0029] For example, the manual up signal is triggered by the manual up KEY6, and the one-key descent function is terminated by the manual up signal. Figure 1As shown, a kind of chipless one-key drop electric vehicle window switch circuit, including motor, diode D4, coil L3, coil L4, switch SW3 and switch SW4, wherein, coil L4 and coil L3 are connected in the cathode of diode D4, the anode of diode D4, the third end of switch SW4 and the third end of switch SW3 are all connected on VBAT pin, the second end of switch SW4 and the second end of switch SW3 are all connected with motor, the first end of switch SW3 is grounded;

[0030] Further include,

[0031] Automatic drop module, including KEY4 and resistance R17, the first end of the KEY4 is connected with the cathode of diode D4, and the second end is connected with resistance R17;

[0032] Manual drop button module, including KEY5, resistance R20 and triode Q9, the first end of the KEY5 is connected with the cathode of diode D4, and the second end is connected with resistance R20, resistance R20 is connected with the base of triode Q9, the emitter of triode Q9 is grounded, and the collector is connected with coil L3;

[0033] Manual rise button module, including KEY6, resistance R21 and triode Q10, the first end of the KEY6 is connected with the cathode of diode D4, and the second end is connected with resistance R21, resistance R21 is connected with the base of triode Q10, the emitter of triode Q10 is grounded, and the collector is connected with coil L4;

[0034] Drop stall current detection module, including triode Q7, resistance R18, resistance R19, resistance R22 and capacitor C1, the base of triode Q7 is connected with resistance R18 and resistance R19, resistance R19 is connected with resistance R22, one end of capacitor C1 is connected between resistance R18 and resistance R19, the emitter of triode Q7, capacitor C1 and resistance R22 are all grounded, and the first end of switch SW4 is connected with resistance R22;

[0035] The falling protection and delay protection module comprises a transistor Q8, a transistor Q6, a transistor Q11, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R23, a resistor R24, a capacitor C3, a diode D3 and a diode D6, the collector of the transistor Q6 is connected with the resistor R16, the emitter is connected with the collector of the transistor Q11, the base is connected with the resistor R15, the emitter of the transistor Q11 is grounded, the collector of the transistor Q8 is connected with the anode of the diode D3, the emitter is connected with the cathode of the diode D4, the base of the transistor Q11 is connected with the resistor R24, the cathode of the diode D3 is connected with the resistor R20, one end of the resistor R24 and one end of the capacitor C3 are connected with the resistor R23, the other end of the capacitor C3 is grounded, the resistor R23 is connected with the resistor R17, the resistor R16 is connected with the base of the transistor Q8, the resistor R14 is connected with the resistor R15 and the emitter of the transistor Q6 respectively, the resistor R15 is connected with the resistor R13 on the collector of the transistor Q7, the collector of the transistor Q7 is connected with the cathode of the diode D6, and the anode of the diode D6 is connected with the resistor R17.

[0036] Specifically, the falling locked-rotor current detection module further comprises a resistor R12, one end of the resistor R12 is connected between the resistor R18 and the resistor R19, and the other end of the resistor R12 is connected with the resistor R21.

[0037] 1. The locked-rotor current detection is realized by the transistor and the sampling resistor when the key is falling to the bottom, and the current is detected without using the operational amplifier chip.

[0038] When the manual rising is performed, the KEY6 is closed and conducted, the resistor R21, the collector and the emitter of the transistor Q10 are conducted, the relay coil L4 is worked, the upper contact of the switch SW4 is closed, that is, the third end of the switch SW4, the motor M obtains the power supply, and the window motor is rotated to drive the window glass to rise. At this time, the current passing through the lower contact of the switch SW3 (that is, the first end of the switch SW3) to the ground does not pass through the sampling resistor R22, so the current does not need to be detected when the manual rising is performed, and the manual rising work is not affected. When the manual falling is performed, the R20 and the transistor Q9 make the L3 obtain the power supply, the upper contact of the switch SW3 is connected, the current passes through the lower contact of the switch SW4 and flows through the resistor R22 (that is, the first end of the switch SW4), when the voltage on the resistor R22 increases, the voltage on the resistor R22 charges the C1 through the resistor R19, when the voltage of the C1 is charged to be greater than the base and the emitter of the transistor Q7, the collector and the emitter of the transistor Q7 are triggered through the resistor R18, and thus it can be detected whether the current exceeds the locked-rotor current value. When the motor is normally rotated, the current value is less than half of the locked-rotor current, and thus whether the window is locked to the locked-rotor can be identified through the falling locked-rotor current detection part, and the operational amplifier chip or the analog-digital conversion chip is not needed, and the voltage stabilizing chip is not needed to supply power for the operational amplifier chip or the analog-digital conversion chip.

[0039] 2. The down-keeping and delay protection is composed of a triode, realizing the logic keeping of one-key down, automatically controlling the driving relay to execute the continuous down and automatically stopping after a certain time delay, avoiding the long-time idling of the motor due to the mechanical failure of the window, so that the micro-control chip or program is not needed for the logic control;

[0040] When the KEY4 one-key down is pressed, the voltage is divided at the base and emitter of the triode Q6 through R17, D6, R15 and R14, the collector and emitter of the triode Q6 are thus turned on, the current passes through R16 and the base and emitter of Q8. After the charging of C3 by R23, the voltage on C3 rises rapidly, the voltage acts on the base and emitter of Q11 through R24, the collector and emitter of Q11 are thus turned on. Q11 provides the working current to the base of Q8 through Q6 and R16, Q8 is turned on, the collector of Q8 provides the working current to R20 and Q9 through D3, L3 obtains the power supply, SW3 is closed, the motor obtains the power and is down. At the same time, the voltage provided by the collector of Q8 through R13 to R15 makes Q6 and Q8 self-lock and keep on, the one-key down is maintained, even if the KEY4 and KEY5 are released, the down can be continued.

[0041] When the KEY5 and KEY4 are released, the electric energy stored in C3 is discharged through the connected devices, when the voltage on C3 is lower than the voltage needed to keep Q11 on, Q6 and Q8 are turned off, the collector of Q8 has no voltage, R20 and Q9 have no voltage, Q9 is turned off, L3 has no power supply, the automatic down of the window is stopped. D6 prevents Q8 from charging C3 through R13, D15, R17 and R23 when Q8 is on, ensuring that the electric energy in C3 will decrease when the KEY5 and KEY4 are released, thus playing the role of delay protection.

[0042] 3. The detection signal provided by the stall current terminates the work of the self-lock circuit, stops the work of the driving relay, and makes the window motor not stall;

[0043] When the automatic down is in progress, the stall current detection of the down detects the stall condition, the current of the resistor R22 increases due to the stall, the voltage at the collector of Q7 is lowered through the action of R19, C1 and R18 on the base of Q7, the voltage at the connection position of R15 and R13 and D6 is lowered to the level close to 0V, Q6 is thus turned off due to the failure of the base and emitter to obtain the current, R16 and Q8 are turned off, the collector of Q8 has no voltage after Q8 is turned off, D3, R20 and Q9 have no working voltage, L3 has no power supply, SW3 is opened, the window motor is not working, and the stall is terminated.

[0044] 4. The work of the manual down signal and the automatic down signal is driven, avoiding the over-current triggering to terminate the down keeping work at the starting moment.

[0045] By mechanical structure guarantee one button down KEY4 press down when KEY5 also press down, automatic drop initial state by KEY5 to R20, Q9 power supply work, starting moment overcurrent drop off current detection work, make Q8 off, D3 no current, but KEY5 in this is still on state, can provide working current to R20, Q9, avoid unable to drop.

[0046] 5, by hand up signal and drive termination automatic drop self-locking circuit work, realize one button drop process at any time stop car window action.

[0047] When one button drop trigger after entering automatic drop work state, not yet dropped to the bottom of the automatic stop, at this time the operation of manual up KEY6, R12 current, C1 charging, C1 charging after Q7 conduction voltage, R18 to Q7 base and emitter provide working current, Q7 collector conduction close to the ground voltage level, early trigger drop off current detection signal to R15 position, make Q6, Q8, D3, R20 off, Q9 off, L3 no electricity, SW3 break, automatic drop end.

[0048] The application proposes a kind of method without using chip to realize manual up, manual down, one button drop and the circuit of automatic stop motor work protection motor and one button drop function in one button drop process by triggering manual up operation termination one button drop function, compared with prior art no chip dependence, circuit is simple, use common general-purpose components, can make the device on circuit have wider supply channel flexible replacement, break chip in one button drop function electric window switch field neck.

Claims

1. A chipless one-key drop electric window switch circuit, characterized in that, The motor, diode D4, coil L3, coil L4, switch SW3 and switch SW4 are connected, wherein the coil L4 and coil L3 are connected at the cathode of diode D4, the anode of diode D4, the third end of switch SW4 and the third end of switch SW3 are connected at the VBAT pin, the second end of switch SW4 and the second end of switch SW3 are connected with the motor, the first end of switch SW3 is grounded; Further comprising, The automatic lowering module comprises KEY4 and resistor R17, the first end of KEY4 is connected with the cathode of diode D4, and the second end is connected with resistor R17; The manual lowering button module comprises KEY5, resistor R20 and triode Q9, the first end of KEY5 is connected with the cathode of diode D4, and the second end is connected with resistor R20, resistor R20 is connected with the base of triode Q9, the emitter of triode Q9 is grounded, and the collector is connected with coil L3; The manual raising button module comprises KEY6, resistor R21 and triode Q10, the first end of KEY6 is connected with the cathode of diode D4, and the second end is connected with resistor R21, resistor R21 is connected with the base of triode Q10, the emitter of triode Q10 is grounded, and the collector is connected with coil L4; The lowering stall current detection module comprises triode Q7, resistor R19, resistor R22, resistor R18 and capacitor C1, resistor R18 is connected with the base of triode Q7 and resistor R19, resistor R19 is connected with resistor R22, one end of capacitor C1 is connected between resistor R18 and resistor R19, the emitter of triode Q7, the other end of capacitor C1 and resistor R22 are grounded, and the first end of switch SW4 is connected with resistor R22; The lowering holding and delay protection module comprises triode Q8, triode Q6, triode Q11, resistor R13, resistor R14, resistor R15, resistor R16, resistor R23, resistor R24, capacitor C3, diode D3 and diode D6, the collector of triode Q6 is connected with resistor R16, the emitter is connected with the collector of triode Q11, the base is connected with resistor R15, the emitter of triode Q11 is grounded, the base of triode Q11 is connected with resistor R24, the collector of triode Q8 is connected with the anode of diode D3, the emitter is connected with the cathode of diode D4, the base of triode Q8 is connected with resistor R16, the cathode of diode D3 is connected with resistor R20, one end of resistor R24 and one end of capacitor C3 are connected with resistor R23, the other end of capacitor C3 is grounded, resistor R23 is connected with resistor R17, resistor R14 is connected with resistor R15 and the emitter of triode Q6 respectively, resistor R15 is connected with resistor R13 at the collector of triode Q7, the collector of triode Q7 is connected with the cathode of diode D6, and the anode of diode D6 is connected with resistor R17; The falling locked-rotor current detection module further comprises a resistor R12, one end of the resistor R12 is connected between the resistor R18 and the resistor R19, and the other end of the resistor R12 is connected with the resistor R21.

Images