Gating signal detection circuit and Bluetooth digital key system

Abstract

The embodiment of the utility model discloses a gating signal detection circuit and a Bluetooth digital key system. The gating signal detection circuit comprises an input isolation protection module, a signal conversion module and a signal detection module. The input isolation protection module is connected with the signal conversion module, and the input isolation protection module is used for receiving a gating signal, isolating a direct current component in the gating signal and transmitting the direct current component to the signal conversion module; the signal conversion module is connected with the signal detection module, the signal conversion module is used for carrying out amplitude limiting processing on the isolated gating signal and transmitting the signal to the signal detection module, and the signal detection module is used for converting the gating signal subjected to the amplitude limiting processing into a signal which can be identified by the processor and transmitting the signal to the processor. According to the utility model, circuit overvoltage damage caused by large-amplitude signal input is avoided, and safe and reliable operation of the circuit is ensured.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of power electronics technology, and in particular to a gate control signal detection circuit and a Bluetooth digital key system. Background Art

[0002] Existing Bluetooth digital key systems automatically lock and unlock the vehicle by acquiring the vehicle's status and executing vehicle control commands. Existing door control signals transmit information via PWM. Vehicle PWM signals have large amplitudes, which can easily cause overvoltage damage to the system after being connected to the system, resulting in unreliable operation. Utility Model Content

[0003] The utility model provides a gate control signal detection circuit and a Bluetooth digital key system, which avoid the situation where the circuit is damaged by overvoltage when a large-amplitude signal is input, and ensure the safe and reliable operation of the circuit.

[0004] According to one aspect of the present invention, a gated signal detection circuit is provided, the gated signal detection circuit comprising: an input isolation protection module, a signal conversion module and a signal detection module;

[0005] The input isolation protection module is connected to the signal conversion module, and is used to receive a gating signal, isolate the DC component in the gating signal, and transmit the DC component to the signal conversion module;

[0006] The signal conversion module is connected to the signal detection module. The signal conversion module is used to limit the isolated gated signal and transmit it to the signal detection module. The signal detection module is used to convert the gated signal after limiting processing into a signal recognizable by the processor and transmit it to the processor.

[0007] Optionally, the input isolation protection module includes: an interface protection device, a first filtering unit and an isolation unit;

[0008] The first end of the interface protection device is connected to the first end of the first filtering unit and the first end of the isolation unit, the second end of the interface protection device is grounded, the second end of the first filtering unit is grounded, and the second end of the isolation unit is connected to the signal conversion module.

[0009] Optionally, the first filtering unit includes a 100th capacitor, and the isolation unit includes a 101st capacitor;

[0010] The first end of the first-hundredth capacitor is connected to the first end of the first-hundredth capacitor, the second end of the first-hundredth capacitor is grounded, and the second end of the first-hundredth capacitor is connected to the signal conversion module.

[0011] Optionally, the signal conversion module includes: a buffer unit, a first current limiting unit, a first switch unit, a first voltage dividing unit and a load unit;

[0012] The first end of the buffer unit is connected to the first end of the first current limiting unit and the first end of the first switch unit, and then to the first power supply end. The second end of the buffer unit is connected to the second end of the first current limiting unit, the control end of the first switch unit, the first end of the first voltage divider unit and the input isolation protection module. The second end of the first voltage divider unit is grounded. The second end of the first switch unit is connected to the first end of the load unit and the signal detection module, and the second end of the load unit is grounded.

[0013] Optionally, the buffer unit includes a 102nd capacitor, the first current limiting unit includes a 100th resistor, the first switch unit includes a first field effect transistor, the first voltage divider unit includes a 101st resistor, and the load unit includes a 102nd resistor;

[0014] The first end of the 102nd capacitor is connected to the first end of the 100th resistor and the first end of the first field-effect transistor, and then to the first power supply end. The second end of the 102nd capacitor is connected to the second end of the 100th resistor, the control end of the first field-effect transistor, the first end of the 101st resistor, and the input isolation protection module. The second end of the 101st resistor is grounded. The second end of the first field-effect transistor is connected to the first end of the 102nd resistor and the signal detection module, and the second end of the 102nd resistor is grounded.

[0015] Optionally, the signal detection module includes: a low-pass filter, a second switch unit, a second current limiting unit and a second filtering unit;

[0016] The first end of the low-pass filter is connected to the signal conversion module, the second end of the low-pass filter is grounded, the third end of the low-pass filter is connected to the control end of the second switch unit, the second end of the second switch unit is grounded, the first end of the second switch unit is connected to the first end of the second current limiting unit, the first end of the second filtering unit and the processor, the second end of the second current limiting unit is connected to the second power supply end, and the second end of the second filtering unit is grounded.

[0017] Optionally, the low-pass filter includes a 103rd resistor and a 103rd capacitor, the second switch unit includes a second field-effect transistor, the second current limiting unit includes a 104th resistor, and the second filtering unit includes a 104th capacitor;

[0018] The first end of the 103rd resistor is connected to the signal conversion module, the second end of the 103rd resistor is connected to the first end of the 103rd capacitor and the control end of the second field-effect transistor, the second end of the 103rd capacitor is grounded, the second end of the second field-effect transistor is grounded, the first end of the second field-effect transistor is connected to the first end of the 104th resistor, the first end of the 104th capacitor and the processor, the second end of the 104th resistor is connected to the second power supply end, and the second end of the 104th capacitor is grounded.

[0019] Optionally, the gating signal is a PWM signal.

[0020] Optionally, the duty cycle of the PWM signal is 0-100%.

[0021] According to another aspect of the present invention, a Bluetooth digital key system is provided. The Bluetooth digital key system includes the gate control signal detection circuit described in any one of the above aspects.

[0022] The technical solution of the embodiment of the present utility model is to isolate the DC component in the gated signal through the input isolation protection module and transmit it to the signal conversion module. The signal conversion module performs amplitude limiting processing on the isolated gated signal and transmits it to the signal detection module. The signal detection module converts the gated signal after amplitude limiting processing into a signal that can be recognized by the processor and transmits it to the processor. The amplitude of the received input gated signal is wide and the anti-interference ability is strong, which avoids the situation where the circuit is damaged by overvoltage when a large amplitude signal is input, and ensures the safe and reliable operation of the circuit. In summary, the present utility model solves the problem that the existing gated signal transmits signal information through PWM, the vehicle PWM signal has a large amplitude, and is easily damaged by overvoltage after being connected to the system, and cannot work reliably.

[0023] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a structural diagram of a gate signal detection circuit provided according to an embodiment of the present utility model;

[0026] Figure 2 This is a structural diagram of an input isolation protection module provided according to an embodiment of the present utility model;

[0027] Figure 3 This is a structural diagram of a signal conversion module provided according to an embodiment of the present utility model;

[0028] Figure 4 This is a structural diagram of a signal detection module provided according to an embodiment of the present utility model;

[0029] Figure 5 The present invention provides a vehicle gate control signal actual waveform acquisition data according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Figure 1 This is a schematic diagram of a gate signal detection circuit according to an embodiment of the present invention. Figure 1An embodiment of the utility model provides a gated signal detection circuit, which includes: an input isolation protection module 10, a signal conversion module 20 and a signal detection module 30; the input isolation protection module 10 is connected to the signal conversion module 20, and the input isolation protection module 10 is used to receive a gated signal, isolate the DC component in the gated signal and transmit it to the signal conversion module 20; the signal conversion module 20 is connected to the signal detection module 30, and the signal conversion module 20 is used to limit the isolated gated signal and transmit it to the signal detection module 30, and the signal detection module 30 is used to convert the gated signal after limiting processing into a signal recognizable by a processor and transmit it to the processor.

[0033] Specifically, the gating signal detection circuit is suitable for multiple Bluetooth positioning systems and is used for gating system management. The gating signal can be a PWM signal. The gating signal received by the input isolation protection module 10 contains a noise signal, and the noise signal needs to be filtered out to play an anti-interference protection role. It is also necessary to isolate the DC component in the gating signal to prevent the DC signal from interfering with the system and causing detection failure. The amplitude of the isolated gating signal is wide, and the signal conversion module 20 needs to be limited and transmitted to the signal detection module 30; the gating signal after the limiting processing is a safe signal, but it cannot be recognized by the processor in the system. The signal detection module 30 is required to convert the gating signal after the limiting processing into a signal that can be recognized by the processor and transmit it to the processor for recognition.

[0034] The technical solution of the embodiment of the present utility model is to isolate the DC component in the gated signal through the input isolation protection module and transmit it to the signal conversion module. The signal conversion module performs amplitude limiting processing on the isolated gated signal and transmits it to the signal detection module. The signal detection module converts the gated signal after amplitude limiting processing into a signal that can be recognized by the processor and transmits it to the processor. The amplitude of the received input gated signal is wide and the anti-interference ability is strong, which avoids the situation where the circuit is damaged by overvoltage when a large amplitude signal is input, and ensures the safe and reliable operation of the circuit. In summary, the present utility model solves the problem that the existing gated signal transmits signal information through PWM, the vehicle PWM signal has a large amplitude, and is easily damaged by overvoltage after being connected to the system, and cannot work reliably.

[0035] Figure 2 This is a schematic diagram of the structure of an input isolation protection module provided according to an embodiment of the present invention, with reference to Figure 2 Optionally, the input isolation protection module 10 includes: an interface protection device D100, a first filtering unit 11 and an isolation unit 12;

[0036] The first end of the interface protection device D100 is connected to the first end of the first filtering unit 11 and the first end of the isolation unit 12, the second end of the interface protection device D100 is grounded, the second end of the first filtering unit 11 is grounded, and the second end of the isolation unit 12 is connected to the signal conversion module.

[0037] Continue to refer Figure 2 Optionally, the first filtering unit 11 includes a 100th capacitor C100, and the isolation unit 12 includes a 101st capacitor C101;

[0038] A first end of the 100th capacitor C100 is connected to a first end of the 101st capacitor C101, a second end of the 100th capacitor C100 is grounded, and a second end of the 101st capacitor C101 is connected to the signal conversion module.

[0039] Specifically, the input terminal A1 of the input isolation protection module 10 is used to receive the gating signal. Input terminal A1 is connected to the interface protection device D100 and is connected in parallel with the 100th capacitor C100. The 100th capacitor C100 is a filter capacitor used to remove noise from the gating signal and provide anti-interference protection. The 101st capacitor C101 is used to isolate the DC component in the gating signal to prevent DC signal interference with the system, thereby detecting failure. The output terminal A2 of the input isolation protection module 10 is connected to the interface protection device D100.

[0040] Figure 3 This is a schematic diagram of the structure of a signal conversion module provided according to an embodiment of the present invention, referring to Figure 3 Optionally, the signal conversion module 20 includes: a buffer unit 21, a first current limiting unit 22, a first switch unit 23, a first voltage dividing unit 24 and a load unit 25;

[0041] The first end of the buffer unit 21 is connected to the first end of the first current limiting unit 22 and the first end S of the first switch unit 23, and then to the first power supply end VCC. The second end of the buffer unit 21 is connected to the second end of the first current limiting unit 22, the control end G of the first switch unit 23, the first end of the first voltage divider unit 24 and the input isolation protection module. The second end of the first voltage divider unit 24 is grounded. The second end D of the first switch unit 23 is connected to the first end of the load unit 25 and the signal detection module. The second end of the load unit 25 is grounded.

[0042] Continue to refer Figure 3 Optionally, the buffer unit 21 includes a 102nd capacitor C102, the first current limiting unit 22 includes a 100th resistor R100, the first switch unit 23 includes a first field effect transistor Q100, the first voltage divider unit 24 includes a 101st resistor R101, and the load unit 25 includes a 102nd resistor R102;

[0043] The first end of the 102nd capacitor C102 is connected to the first end of the 100th resistor R100 and the first end of the first field effect transistor Q100, and then to the first power supply terminal VCC. The second end of the 102nd capacitor C102 is connected to the second end of the 100th resistor R100, the control end G of the first field effect transistor Q100, the first end of the 101st resistor R101, and the input isolation protection module. The second end of the 101st resistor R101 is grounded. The second end D of the first field effect transistor Q100 is connected to the first end of the 102nd resistor R102 and the signal detection module. The second end of the 102nd resistor R102 is grounded.

[0044] Specific, combined Figure 2 B1 is the input end of the signal conversion module 20, which is connected in series with the output end A2 of the input isolation protection module 10. The input end B1 of the signal conversion module 20 is connected in series with the first field effect transistor Q100. The first field effect transistor Q100 is a switch tube that acts as a switch.

[0045] Resistor R100 is connected in parallel with capacitor C102. Capacitor C102 acts as a buffer, filtering out incoming external PWM interference signals and preventing the first field-effect transistor Q100 from operating. Capacitor C102 and resistor R100 are connected in parallel at the GS terminal of the first field-effect transistor Q100. Resistor R101 is connected in parallel to the B1 network and grounded. Resistors R101 and R102 act as a voltage divider, protecting the GS voltage of the first field-effect transistor Q100 from excessively high voltages, thus preventing damage. Capacitor C102 acts as a buffer circuit. Resistor R102 is connected in parallel to output terminal B2 of the signal conversion module 20, providing a load function.

[0046] Figure 4 This is a schematic diagram of the structure of a signal detection module provided according to an embodiment of the present invention, with reference to Figure 4 Optionally, the signal detection module 30 includes: a low-pass filter 31, a second switch unit 32, a second current limiting unit 33 and a second filtering unit 34;

[0047] The first end of the low-pass filter 31 is connected to the signal conversion module, the second end of the low-pass filter 21 is grounded, the third end of the low-pass filter 31 is connected to the control end 1 of the second switch unit 32, the second end 2 of the second switch unit 32 is grounded, the first end 3 of the second switch unit 32 is connected to the first end of the second current limiting unit 33, the first end of the second filtering unit 34 and the processor, the second end of the second current limiting unit 33 is connected to the second power supply end VCC2, and the second end of the second filtering unit 34 is grounded.

[0048] Continue to refer Figure 4 Optionally, the low-pass filter 31 includes a 103rd resistor R103 and a 103rd capacitor C103, the second switch unit 32 includes a second field effect transistor Q102, the second current limiting unit 33 includes a 104th resistor R104, and the second filtering unit 34 includes a 104th capacitor C104;

[0049] The first end of the 103rd resistor R103 is connected to the signal conversion module, the second end of the 103rd resistor R103 is connected to the first end of the 103rd capacitor C103 and the control end 1 of the second field effect transistor Q102, the second end of the 103rd capacitor C103 is grounded, the second end 2 of the second field effect transistor Q102 is grounded, the first end 3 of the second field effect transistor Q102 is connected to the first end of the 104th resistor R104, the first end of the 104th capacitor C104 and the processor, the second end of the 104th resistor R104 is connected to the second power supply end VCC2, and the second end of the 104th capacitor C104 is grounded.

[0050] Specifically, the input terminal of the signal detection module 30 is C1. The 103rd resistor R103 is connected in series between the 103rd capacitor C103 and the second field-effect transistor Q102, and the 103rd capacitor C103 is connected in parallel to ground, forming a low-pass filter to prevent noise from interfering with the detection circuit. The first terminal 3 of the second field-effect transistor Q102 is connected in series with the 104th resistor R104 to the second power supply terminal VCC2, which is the power supply identified by the processor. The output terminal C2 of the signal detection module 30 is connected in parallel with the 104th capacitor C104 to ground. The output terminal C2 of the signal detection module 30 transmits the detection signal to the processor for identification.

[0051] Optionally, the gate control signal is a PWM signal.

[0052] Optionally, the duty cycle of the PWM signal is 0-100%.

[0053] Specifically, Figure 5 This is a vehicle gate control signal actual waveform acquisition data provided by the embodiment of the utility model, reference Figure 5 The gate signal input is a PWM signal with a wide duty cycle range. The gate signal detection circuit can receive PWM signals with a duty cycle of 0-100%. The input signal amplitude is wide and can accept signal inputs within the vehicle's 12V system battery voltage range.

[0054] An embodiment of the present invention further provides a Bluetooth digital key system, which includes the gate signal detection circuit provided by any embodiment of the present invention.

[0055] Since the Bluetooth digital key system includes the gate signal detection circuit provided by any embodiment of the present invention, the beneficial effects of the Bluetooth digital key system and the gate signal detection circuit are the same and will not be described in detail here.

[0056] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A gate signal detection circuit, characterized in that: include: Input isolation protection module, signal conversion module and signal detection module; The input isolation protection module is connected to the signal conversion module, and is used to receive a gating signal, isolate a DC component in the gating signal, and transmit the DC component to the signal conversion module; The signal conversion module is connected to the signal detection module. The signal conversion module is used to limit the isolated gated signal and transmit it to the signal detection module. The signal detection module is used to convert the gated signal after limiting processing into a signal recognizable by the processor and transmit it to the processor.

2. The gate signal detection circuit according to claim 1, wherein: The input isolation protection module includes: an interface protection device, a first filtering unit and an isolation unit; The first end of the interface protection device is connected to the first end of the first filtering unit and the first end of the isolation unit, the second end of the interface protection device is grounded, the second end of the first filtering unit is grounded, and the second end of the isolation unit is connected to the signal conversion module.

3. The gate signal detection circuit according to claim 2, wherein: The first filtering unit includes a 100th capacitor, and the isolation unit includes a 101st capacitor; The first end of the first-hundred capacitor is connected to the first end of the first-hundred-first capacitor, the second end of the first-hundred capacitor is grounded, and the second end of the first-hundred-first capacitor is connected to the signal conversion module.

4. The gate signal detection circuit according to claim 1, wherein: The signal conversion module includes: a buffer unit, a first current limiting unit, a first switch unit, a first voltage dividing unit and a load unit; The first end of the buffer unit is connected to the first end of the first current limiting unit and the first end of the first switch unit, and then to the first power supply end. The second end of the buffer unit is connected to the second end of the first current limiting unit, the control end of the first switch unit, the first end of the first voltage divider unit and the input isolation protection module. The second end of the first voltage divider unit is grounded. The second end of the first switch unit is connected to the first end of the load unit and the signal detection module, and the second end of the load unit is grounded.

5. The gate signal detection circuit according to claim 4, characterized in that: The buffer unit includes a 102nd capacitor, the first current limiting unit includes a 100th resistor, the first switch unit includes a first field effect transistor, the first voltage divider unit includes a 101st resistor, and the load unit includes a 102nd resistor; The first end of the 102nd capacitor is connected to the first end of the 100th resistor and the first end of the first field-effect transistor, and then to the first power supply end. The second end of the 102nd capacitor is connected to the second end of the 100th resistor, the control end of the first field-effect transistor, the first end of the 101st resistor, and the input isolation protection module. The second end of the 101st resistor is grounded. The second end of the first field-effect transistor is connected to the first end of the 102nd resistor and the signal detection module, and the second end of the 102nd resistor is grounded.

6. The gate signal detection circuit according to claim 1, wherein: The signal detection module includes: a low-pass filter, a second switch unit, a second current limiting unit and a second filtering unit; The first end of the low-pass filter is connected to the signal conversion module, the second end of the low-pass filter is grounded, the third end of the low-pass filter is connected to the control end of the second switch unit, the second end of the second switch unit is grounded, the first end of the second switch unit is connected to the first end of the second current limiting unit, the first end of the second filtering unit and the processor, the second end of the second current limiting unit is connected to the second power supply end, and the second end of the second filtering unit is grounded.

7. The gate signal detection circuit according to claim 6, characterized in that: The low-pass filter includes a 103rd resistor and a 103rd capacitor, the second switch unit includes a second field-effect transistor, the second current limiting unit includes a 104th resistor, and the second filtering unit includes a 104th capacitor; The first end of the 103rd resistor is connected to the signal conversion module, the second end of the 103rd resistor is connected to the first end of the 103rd capacitor and the control end of the second field-effect transistor, the second end of the 103rd capacitor is grounded, the second end of the second field-effect transistor is grounded, the first end of the second field-effect transistor is connected to the first end of the 104th resistor, the first end of the 104th capacitor and the processor, the second end of the 104th resistor is connected to the second power supply end, and the second end of the 104th capacitor is grounded.

8. The gate signal detection circuit according to claim 1, wherein: The gate control signal is a PWM signal.

9. The gate signal detection circuit according to claim 8, characterized in that: The duty cycle of the PWM signal is 0-100%.

10. A Bluetooth digital key system, characterized in that: The gate signal detection circuit comprises the gate signal detection circuit according to any one of claims 1 to 9.

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