An automatic wake-up electric pen driving circuit

Abstract

This invention discloses an automatically wake-up driving circuit for a test pen, comprising a detection module, a trigger module, a locking module, and a sampling module. The detection module includes a transistor powered by a battery via a field-effect transistor, connected to the main pen. Based on the connection state of the main pen, it outputs a detection signal. An operational amplifier acquires the detection signal and supplies it to a comparator for comparison. A Schottky diode outputs an external trigger signal. The trigger module conducts based on the external trigger signal, supplying operating current to the sampling module. The locking module maintains the conduction of the trigger module according to a power-locking signal. The sampling module samples and outputs an indicator signal. Thus, in standby mode, monitoring is maintained with minimal power consumption. When contact between the main pen and the auxiliary pen is detected, the circuit automatically conducts, generating a power-locking signal to maintain power supply. When the main pen and the auxiliary pen are disconnected, the circuit returns to standby mode. Therefore, manual power on / off is unnecessary; circuit testing can be triggered at any time, and the circuit returns to standby mode when idle, significantly reducing overall device power consumption and effectively extending device lifespan.

Description

Technical Field

[0001] This invention relates to the field of signal detection and circuit design technology, and in particular to an automatic wake-up driving circuit for a test pen. Background Technology

[0002] In the field of automotive testing and repair, automotive wiring test pens are commonly used testing equipment. They can accurately collect electrical parameters or signals from automotive power supply cables or signal cables to identify specific faults and troubleshoot problems. Currently, automotive wiring test pens on the market require manual power on / off operation. After powering on, their signal acquisition components continuously run, waiting for electrical signal input. For automotive wiring test pens with comprehensive testing functions, their signal acquisition components and related protection components will generate high power consumption in standby mode. For ease of operation, repair personnel usually keep the pens powered on during the repair process. However, the total measurement time during the entire repair process may be less than one minute. This results in most of the battery's charge being used to maintain the high-power standby state, leading to significantly higher operating power consumption and negatively impacting the lifespan of the automotive wiring test pen. Summary of the Invention

[0003] This embodiment discloses an automatic wake-up driving circuit for a test pen, specifically including: Detection module, triggering module, locking module and sampling module; The detection module includes a transistor Q19 that obtains the battery power supply Vbat via a field-effect transistor Q9. The collector of the transistor Q19 is connected to the main pen MP1 via a diode D19. Based on the connection state of the main pen MP1, a high-level or low-level detection signal N_POL_SIGNAL is output. An operational amplifier U28 obtains the detection signal N_POL_SIGNAL and supplies it to a comparator U21 for comparison. A Schottky diode D6 cuts off or outputs an external trigger signal POWER_ON based on the comparison result. The triggering module includes transistor Q10, field-effect transistor Q14, and field-effect transistor Q21, which are turned on based on the external trigger signal POWER_ON, to supply operating current BAT3V to the sampling module. The locking module uses a transistor Q11, which is used to be triggered and turned on according to the power-lock signal POWER_LOCK, so as to maintain the conduction of the triggering module; The sampling module uses a boost chip U12 to boost the operating current BAT3V into a +3.3V sampling current, which is supplied to the operational amplifier U17 to sample and output the indication signal AD_BAT_V.

[0004] As an optional implementation, when the main pen MP1 is not in contact with the secondary pen, the field-effect transistor Q9 is turned on, the emitter of the transistor Q19 is at a high level and the base is at a low level. When the transistor Q19 is turned on, the detection signal N_POL_SIGNAL is output as high level through resistors R7, R80, R134 and R158. The high-level detection signal N_POL_SIGNAL has a voltage value of 2.5V.

[0005] As an optional implementation, the operational amplifier U28 receives the detection signal N_POL_SIGNAL with a voltage value of 2.5V on pin 3, obtains the battery power supply Vbat on pin 5, and connects pin 1 to pin 4. At the same time, pin 1 is connected to pin 4 of the comparator U21, and outputs the detection signal N_POL_SIGNAL with a voltage value of 2.5V to the comparator U21. The comparator U21 obtains a reference voltage of 0.52V at its third pin, compares the reference voltage with the high-level detection signal N_POL_SIGNAL, and does not output a level signal at its first pin. The Schottky diode D6 is turned off and does not output the external trigger signal POWER_ON.

[0006] As an optional implementation, the secondary pen is grounded; When the main pen MP1 is in contact with the secondary pen and conduction is achieved, the base of the transistor Q19 is pulled low and the transistor Q19 is turned off, the gate of the field-effect transistor Q9 is pulled high and the field-effect transistor Q9 is turned off, and the detection signal N_POL_SIGNAL is output at a low level. The low-level detection signal N_POL_SIGNAL has a voltage value of 0V.

[0007] As an optional implementation, the operational amplifier U28 receives the detection signal N_POL_SIGNAL with a voltage value of 0V at its third pin and outputs the detection signal N_POL_SIGNAL with a voltage value of 0V to the comparator U21; The comparator U21 outputs a high level of 3V at pin 1, which triggers the Schottky diode D6 to output the external trigger signal POWER_ON.

[0008] As an optional implementation, the base of transistor Q10 receives the external trigger signal POWER_ON, transistor Q10 is turned on, pulling down the gates of field-effect transistors Q14 and Q21, and field-effect transistors Q14 and Q21 are turned on at a low level, outputting the operating current BAT3V. The operating current BAT3V is generated based on the battery power supply Vbat.

[0009] As an optional implementation, when the trigger module outputs the operating current BAT3V, it generates the power-lock signal POWER_LOCK, and the transistor Q11 is turned on based on the power-lock signal POWER_LOCK to maintain the continuous output of the operating current BAT3V by the trigger module.

[0010] As an optional implementation, based on the sampling current output by the boost chip U12, the operational amplifier U17 performs voltage division sampling and outputs the indication signal AD_BAT_V; The indicator signal AD_BAT_V is used to indicate the battery's charge status.

[0011] As an optional implementation, when the main pen MP1 comes into contact with the secondary pen, the back-end electrical testing module performs circuit detection, and the electrical testing module generates and outputs the power-lock signal POWER_LOCK.

[0012] As an optional implementation, when the main pen MP1 is detached from the secondary pen, the comparator U21 does not output a level signal, the Schottky diode D6 is turned off, and the external trigger signal POWER_ON is not output.

[0013] Compared with the prior art, this embodiment has the following beneficial effects: In standby mode, the device monitors the main pen with minimal power consumption. When contact between the main and secondary pens is detected for circuit testing, the power supply is automatically activated, generating a power-lock signal to maintain power. When the main and secondary pens are disconnected, the device automatically returns to standby mode. Therefore, no manual power on / off is required; circuit testing can be triggered at any time, and the device transitions to a low-power standby state when idle, significantly reducing overall power consumption and effectively extending device lifespan. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the circuit principle of the detection module in an automatically wake-up test pen driving circuit disclosed in this embodiment; Figure 2 This is a schematic diagram of the circuit principle of the trigger module and the locking module in an automatically wake-up test pen driving circuit disclosed in this embodiment; Figure 3 This is a schematic diagram of the sampling module in an automatically wake-up test pen driving circuit disclosed in this embodiment. Detailed Implementation

[0016] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-3 This embodiment discloses an automatic wake-up test pen driving circuit, comprising: Detection module, triggering module, locking module and sampling module; The detection module includes a transistor Q19 that obtains the battery power supply Vbat via a field-effect transistor Q9. The collector of transistor Q19 is connected to the main pen MP1 via a diode D19. Based on the connection state of the main pen MP1, it outputs a high-level or low-level detection signal N_POL_SIGNAL. Operational amplifier U28 obtains the detection signal N_POL_SIGNAL and supplies it to comparator U21 for comparison. Schottky diode D6 cuts off or outputs an external trigger signal POWER_ON based on the comparison result. The triggering module includes transistor Q10, field-effect transistor Q14 and field-effect transistor Q21, which are turned on based on the external trigger signal POWER_ON, to supply the operating current BAT3V to the sampling module; The locking module uses a transistor Q11, which is used to trigger the conduction according to the power-lock signal POWER_LOCK, so as to keep the trigger module on. The sampling module uses a boost chip U12 to boost the operating current BAT3V into a +3.3V sampling current, which is supplied to the operational amplifier U17 to sample and output the indication signal AD_BAT_V.

[0018] In this embodiment, in standby mode, the detection module maintains monitoring of the pen with minimal power consumption.

[0019] When the detection module detects contact between the main pen and the auxiliary pen and performs circuit testing, the trigger module automatically turns on the power supply. At the same time, the locking module generates a power-lock signal to maintain power supply.

[0020] Furthermore, when the detection module detects that the main pen and the secondary pen have detached, it automatically switches to standby mode.

[0021] Therefore, no manual power-on or power-off is required; circuit testing can be triggered at any time, and the device will switch to a low-power standby state when idle, significantly reducing the overall power consumption of the device and effectively extending its lifespan.

[0022] Among them, diode D19 plays a safety protection role, which can prevent excessive high voltage from being introduced through the main pen MP1 and causing damage to the back-end circuit.

[0023] As an optional implementation, when the main pen MP1 is not in contact with the secondary pen, the field-effect transistor Q9 is turned on, the emitter of the transistor Q19 is at a high level and the base is at a low level. When the transistor Q19 is turned on, a high-level detection signal N_POL_SIGNAL is output through resistors R7, R80, R134 and R158. The high-level detection signal N_POL_SIGNAL has a voltage value of 2.5V.

[0024] Here, the high-level detection signal N_POL_SIGNAL is used to characterize the state where the main pen MP1 and the secondary pen are not in contact.

[0025] As an optional implementation, the operational amplifier U28 receives a detection signal N_POL_SIGNAL with a voltage value of 2.5V on pin 3, obtains the battery power supply Vbat on pin 5, and connects pin 1 to pin 4. At the same time, pin 1 is connected to pin 4 of comparator U21, and outputs a detection signal N_POL_SIGNAL with a voltage value of 2.5V to comparator U21. The 3rd pin of comparator U21 acquires a reference voltage of 0.52V. The reference voltage is compared with the high-level detection signal N_POL_SIGNAL. Its 1st pin does not output a level signal, the Schottky diode D6 is cut off, and the external trigger signal POWER_ON is not output.

[0026] Here, based on the high-level detection signal N_POL_SIGNAL, the trigger module does not output a signal, and therefore does not output operating current. The back-end circuit of the test pen is not powered, and the test pen is in standby mode.

[0027] As can be seen, compared to existing test pen devices that require manual on / off operation and maintain high power consumption even when not performing testing, this embodiment can maintain the operation of the detection module with only low power consumption in standby mode by measuring the device status, thus significantly reducing standby power consumption and significantly improving battery life.

[0028] As a result, the ineffective operating time of each component in the test pen is significantly reduced, and the equipment lifespan is extended.

[0029] As an optional implementation, the secondary pen is grounded; When the main pen MP1 is in contact with the auxiliary pen and conducts, the base of transistor Q19 is pulled low and transistor Q19 is cut off, the gate of field-effect transistor Q9 is pulled high and field-effect transistor Q9 is cut off, and a low-level detection signal N_POL_SIGNAL is output. The voltage value of the low-level detection signal N_POL_SIGNAL is 0V.

[0030] As an optional implementation, the third pin of the operational amplifier U28 receives a detection signal N_POL_SIGNAL with a voltage value of 0V and outputs a detection signal N_POL_SIGNAL with a voltage value of 0V to the comparator U21; The first pin of comparator U21 outputs a high level of 3V, which triggers the Schottky diode D6 to output the external trigger signal POWER_ON.

[0031] Here, the low-level detection signal N_POL_SIGNAL indicates that the main pen MP1 is in contact with the secondary pen, meaning that the user is using a test pen to perform circuit testing.

[0032] Accordingly, the trigger module outputs an external trigger signal POWER_ON to trigger power supply to the back-end circuit, enabling the test pen to enter normal operating state.

[0033] As an optional implementation, the base of transistor Q10 receives an external trigger signal POWER_ON, transistor Q10 turns on, pulls down the gates of field-effect transistors Q14 and Q21, field-effect transistors Q14 and Q21 turn on at a low level, and outputs a running current BAT3V. The operating current BAT3V is generated based on the battery-powered Vbat.

[0034] As an optional implementation, when the trigger module outputs the operating current BAT3V, it generates a power-lock signal POWER_LOCK. The transistor Q11 is turned on based on the power-lock signal POWER_LOCK to maintain the continuous output of the operating current BAT3V by the trigger module.

[0035] Here, as long as the main pen MP1 and the auxiliary pen remain in contact and connected, the power lock signal POWER_LOCK will continue to be generated to maintain the overall power supply of the test pen and achieve power supply lock.

[0036] As an optional implementation, based on the sampling current output by the boost chip U12, the operational amplifier U17 performs voltage division sampling and outputs an indication signal AD_BAT_V; The indicator signal AD_BAT_V is used to indicate the battery's charge status.

[0037] As an optional implementation, when the main pen MP1 comes into contact with the secondary pen, the back-end electrical testing module performs circuit detection, and the electrical testing module generates and outputs a power-lock signal POWER_LOCK.

[0038] As an optional implementation, when the main pen MP1 is detached from the secondary pen, the comparator U21 does not output a level signal, the Schottky diode D6 is cut off, and the external trigger signal POWER_ON is not output.

[0039] Here, based on the contact action between the main pen MP1 and the auxiliary pen, the test pen immediately enters the testing state.

[0040] Conversely, based on the disengagement of the main pen MP1 and the secondary pen, the test pen immediately enters standby mode.

[0041] This process requires no manual intervention; as long as the battery has power, it can operate continuously and stably, providing an excellent user experience.

[0042] Compared with the prior art, this embodiment has the following beneficial effects: In standby mode, the device monitors the main pen with minimal power consumption. When contact between the main and secondary pens is detected for circuit testing, the power supply is automatically activated, generating a power-lock signal to maintain power. When the main and secondary pens are disconnected, the device automatically returns to standby mode. Therefore, no manual power on / off is required; circuit testing can be triggered at any time, and the device transitions to a low-power standby state when idle, significantly reducing overall power consumption and effectively extending device lifespan.

Claims

1. A driving circuit for an automatically wake-up test pen, characterized in that, include: Detection module, triggering module, locking module and sampling module; The detection module includes a transistor Q19 that obtains the battery power supply Vbat via a field-effect transistor Q9. The collector of the transistor Q19 is connected to the main pen MP1 via a diode D19. Based on the connection state of the main pen MP1, a high-level or low-level detection signal N_POL_SIGNAL is output. An operational amplifier U28 obtains the detection signal N_POL_SIGNAL and supplies it to a comparator U21 for comparison. A Schottky diode D6 cuts off or outputs an external trigger signal POWER_ON based on the comparison result. The triggering module includes transistor Q10, field-effect transistor Q14, and field-effect transistor Q21, which are turned on based on the external trigger signal POWER_ON, to supply operating current BAT3V to the sampling module. The locking module uses a transistor Q11, which is used to be triggered and turned on according to the power-lock signal POWER_LOCK, so as to maintain the conduction of the triggering module; The sampling module uses a boost chip U12 to boost the operating current BAT3V into a +3.3V sampling current, which is supplied to the operational amplifier U17 to sample and output the indication signal AD_BAT_V.

2. The automatic wake-up test pen driving circuit according to claim 1, characterized in that, include: When the main pen MP1 is not in contact with the secondary pen, the field-effect transistor Q9 is turned on, the emitter of the transistor Q19 is at a high level and the base is at a low level. When the transistor Q19 is turned on, the detection signal N_POL_SIGNAL is output as high level through resistors R7, R80, R134 and R158. The high-level detection signal N_POL_SIGNAL has a voltage value of 2.5V.

3. The automatic wake-up driving circuit for a test pen according to claim 2, characterized in that, include: The operational amplifier U28 receives the detection signal N_POL_SIGNAL with a voltage value of 2.5V at pin 3, obtains the battery power supply Vbat at pin 5, and connects pin 1 to pin 4. At the same time, pin 1 is connected to pin 4 of the comparator U21, and outputs the detection signal N_POL_SIGNAL with a voltage value of 2.5V to the comparator U21. The comparator U21 obtains a reference voltage of 0.52V at its third pin, compares the reference voltage with the high-level detection signal N_POL_SIGNAL, and does not output a level signal at its first pin. The Schottky diode D6 is turned off and does not output the external trigger signal POWER_ON.

4. The automatic wake-up driving circuit for a test pen according to claim 2, characterized in that, include: The secondary pen is grounded; When the main pen MP1 is in contact with the secondary pen and conduction is achieved, the base of the transistor Q19 is pulled low and the transistor Q19 is turned off, the gate of the field-effect transistor Q9 is pulled high and the field-effect transistor Q9 is turned off, and the detection signal N_POL_SIGNAL is output at a low level. The low-level detection signal N_POL_SIGNAL has a voltage value of 0V.

5. The automatic wake-up driving circuit for a test pen according to claim 4, characterized in that, include: The operational amplifier U28 receives the detection signal N_POL_SIGNAL with a voltage value of 0V at its third pin and outputs the detection signal N_POL_SIGNAL with a voltage value of 0V to the comparator U21. The comparator U21 outputs a high level of 3V at pin 1, which triggers the Schottky diode D6 to output the external trigger signal POWER_ON.

6. The automatic wake-up driving circuit for a test pen according to claim 5, characterized in that, include: The base of transistor Q10 receives the external trigger signal POWER_ON, and transistor Q10 is turned on, pulling down the gates of field-effect transistors Q14 and Q21. Field-effect transistors Q14 and Q21 are turned on at a low level, and the operating current BAT3V is output. The operating current BAT3V is generated based on the battery power supply Vbat.

7. The automatic wake-up driving circuit for a test pen according to claim 6, characterized in that, include: When the trigger module outputs the operating current BAT3V, it generates the power-lock signal POWER_LOCK. The transistor Q11 is turned on based on the power-lock signal POWER_LOCK, maintaining the continuous output of the operating current BAT3V by the trigger module.

8. The automatic wake-up driving circuit for a test pen according to claim 6, characterized in that, include: Based on the sampling current output by the boost chip U12, the operational amplifier U17 performs voltage division sampling and outputs the indication signal AD_BAT_V; The indicator signal AD_BAT_V is used to indicate the battery's charge status.

9. The automatic wake-up driving circuit for a test pen according to claim 6, characterized in that, include: When the main pen MP1 comes into contact with the secondary pen, the back-end electrical testing module performs circuit detection, and the electrical testing module generates and outputs the power-lock signal POWER_LOCK.

10. The automatic wake-up driving circuit for a test pen according to claim 9, characterized in that, include: When the main pen MP1 is disconnected from the secondary pen, the comparator U21 does not output a level signal, the Schottky diode D6 is turned off, and the external trigger signal POWER_ON is not output.

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