Control source early warning detection circuit

Abstract

The utility model provides a control source early warning detection circuit, which comprises a voltage conversion module, an acquisition module, a control module and an indication module, and is characterized in that the input end of the voltage conversion module is electrically connected with the power supply end of an external lithium battery, and the output end of the voltage conversion module is electrically connected with the power supply end of a remote controller; the voltage conversion module is used for regulating output voltage to the remote controller; the input end of the acquisition module is electrically connected with the output end of the voltage conversion module, the output end of the acquisition module is electrically connected with the input end of the control module, and the acquisition module is used for acquiring a voltage signal output by the voltage conversion module and feeding back the voltage signal to the control module; the input end of the indication module is electrically connected with the output end of the control module and used for indicating low-voltage early warning of the remote controller, the circuit can detect whether a low-voltage detection mechanism of the remote controller is effective or not, normal time of the remote controller is guaranteed, and reliability and safety of equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of remote control detection, in particular to a control source early warning detection circuit. Background Technique

[0002] With the progress of technology and the popularization of intelligent products, the remote control, as an indispensable electronic device in daily life, has higher and higher requirements for its functions and performance; and the stable operation of the remote control is inseparable from a reliable power supply. Therefore, the real-time monitoring of the battery voltage of the remote control becomes particularly important; the voltage detection circuit, as one of the key technologies to ensure the stable power supply of the remote control, has received extensive attention and development in recent years.

[0003] The publication number CN221370283U includes a first bridge crane and a second bridge crane. The first bridge crane and the second bridge crane are installed on the lifting bridge in a sliding connection manner. It also includes a wireless remote control body for controlling the first bridge crane and the second bridge crane. A control chip is arranged in the wireless remote control body, and a selection knob for rotating the control of the first bridge crane and the second bridge crane is installed at the front end of the outer wall of the wireless remote control body.

[0004] At present, before the lithium battery of the remote control runs out of power, the voltage will gradually drop. Most existing remote controls have a low voltage detection mechanism, but it is impossible to know whether the low voltage detection mechanism of the remote control is effective after long-term use. When the remote control suddenly loses power in the special equipment industry, it may lead to serious safety accidents, thereby reducing the reliability and safety of the equipment. Content of the Utility Model

[0005] In view of this, the utility model provides a control source early warning detection circuit, which can detect whether the low voltage detection mechanism of the remote control is effective, ensures the normal operation time of the remote control, and improves the reliability and safety of the equipment.

[0006] The utility model provides a control source early warning detection circuit, including a voltage conversion module, a collection module, a control module and an indication module, wherein,

[0007] The input end of the voltage conversion module is electrically connected to the external lithium battery power supply end, and the output end of the voltage conversion module is electrically connected to the power supply end of the remote control. The voltage conversion module is used to regulate and control the output voltage to the remote control;

[0008] The input end of the collection module is electrically connected to the output end of the voltage conversion module, and the output end of the collection module is electrically connected to the input end of the control module. The collection module is used to collect the voltage signal output by the voltage conversion module and feedback it to the control module;

[0009] The input end of the indication module is electrically connected to the output end of the control module, and is used to indicate the low-voltage warning of the remote control.

[0010] Based on the above technical solution, preferably, the voltage conversion module includes a step-down chip U1, capacitors C1, C2, C3, C4, C5, C6, C7, C8, resistors R1, R2, a variable resistor VR1, and a filter L1. Among them, pins 10, 11, 12, and 13 of the step-down chip U1 are commonly connected and are respectively electrically connected to capacitors C5, C6, C7, and the input end of the voltage conversion module; the other ends of capacitors C5, C6, and C7 are grounded; pins 4 and 11 of the step-down chip U1 are commonly connected and are respectively electrically connected to the first end and the second end of the variable resistor VR1, capacitors C1, C2, C3, C4, the output end of the voltage conversion module, and the input end of the acquisition module. The other ends of capacitors C1, C2, C3, and C4 are commonly grounded. Pin 3 of the step-down chip U1 is electrically connected to one end of resistors R1 and R2 respectively. The other end of resistor R1 is electrically connected to the third end of the variable resistor VR1, and the other end of resistor R2 is grounded; one end of the filter L1 is electrically connected to pins 8 and 9 of the step-down chip U1, and the other end is electrically connected to pins 6 and 7 of the step-down chip U1; pin 1 of the step-down chip U1 is electrically connected to capacitor C8, and the other end of capacitor C8 is respectively connected to pins 2 and 15 of the step-down chip U1 and grounded.

[0011] Based on the above technical solution, preferably, the acquisition module includes resistors R3, R4, R5, a capacitor C9, and a voltage stabilizing diode D1. Among them, the output end of the voltage conversion module is electrically connected to resistor R3, and the other end of resistor R3 is respectively electrically connected to resistors R4 and R5. The other end of resistor R4 is respectively electrically connected to capacitor C9, the voltage stabilizing diode D1, and the input end of the control module. The other ends of resistors R5, capacitor C9, and the voltage stabilizing diode D1 are grounded.

[0012] Based on the above technical solution, preferably, an amplification module is further included. The input end of the amplification module is electrically connected to the output end of the acquisition module, and the output end of the amplification module is electrically connected to the input end of the control module. The amplification module is used to amplify the voltage signal output by the voltage conversion module collected.

[0013] Based on the above technical solutions, preferably, the amplification module includes an amplification chip U5, a capacitor C22, a capacitor C24, a resistor R6, and a capacitor C23. Among them, the output end of the acquisition module is electrically connected to the positive-phase input end of the capacitor C24 and the amplification chip U5 respectively. The inverting input end of the amplification chip U5 is electrically connected to the output end of the amplification chip U5 and the resistor R6 respectively. The other end of the resistor R6 is electrically connected to the capacitor C23 and the input end of the control module respectively. The power supply end of the amplification chip U5 is electrically connected to an external power supply and the capacitor C22 respectively. The grounding ends of the capacitor C22, the capacitor C24, the capacitor C23, and the amplification chip U5 are grounded respectively.

[0014] Based on the above technical solutions, preferably, the indication module includes a resistor R23 and a light-emitting diode D5. One end of the resistor R23 is electrically connected to the output of the control module, and the other end of the resistor R23 is electrically connected to the positive electrode of the light-emitting diode D5. The negative electrode of the light-emitting diode D5 is grounded.

[0015] Based on the above technical solutions, preferably, a display module is further included. The input end of the display module is electrically connected to the output end of the control module and is used to display the voltage signal output by the voltage conversion module.

[0016] Based on the above technical solutions, preferably, the display module includes a display screen, a resistor R10, a resistor R11, a bidirectional breakdown diode D3, a bidirectional breakdown diode D2, and a communication interface CN1. Among them, pin 3 of the communication interface CN1 is electrically connected to the resistor R10 and one end of the bidirectional breakdown diode D2 respectively. The other end of the resistor R10 is electrically connected to the feedback control chip U7. Pin 2 of the communication interface CN1 is electrically connected to the resistor R11 and one end of the bidirectional breakdown diode D3 respectively. The other end of the resistor R11 is electrically connected to the feedback control chip U7. The other ends of the bidirectional breakdown diode D3 and the bidirectional breakdown diode D2 are grounded respectively. The communication interface CN1 is electrically connected to the display screen through USB communication.

[0017] Based on the above technical solutions, preferably, a voltage stabilization module is further included. Among them, the input end of the voltage stabilization module is electrically connected to the external lithium battery power supply end, and the output end of the voltage stabilization module is electrically connected to the control module and the amplification module respectively for supplying power to them.

[0018] Based on the above technical solutions, preferably, the voltage stabilizing module includes a voltage stabilizing chip U2, a capacitor C10, a capacitor C11, a capacitor C12, and a capacitor C13. Among them, pin 1 of the voltage stabilizing chip U2 is electrically connected to pin 3, the capacitor C13, the capacitor C12, and the external lithium battery power supply terminal respectively. The capacitor C13 is commonly grounded with the capacitor C12 and pin 2 of the voltage stabilizing chip U2. Pin 5 of the voltage stabilizing chip U2 is electrically connected to the capacitor C10, the capacitor C11, and the output terminal of the voltage stabilizing module respectively. The other ends of the capacitor C10 and the capacitor C11 are commonly grounded, and the output voltage of the voltage stabilizing module is 3.3V.

[0019] The control source early warning detection circuit of the present utility model has the following beneficial effects compared with the prior art:

[0020] (1) The original voltage of the external lithium battery is converted into a stable voltage required for the normal operation of the remote control through the voltage conversion module. At this time, the remote control operates normally. During the adjustment process, if the remote control gives a low voltage alarm prompt, it indicates that the low voltage detection mechanism of the remote control is qualified and effective. Thus, it can detect whether the low voltage detection mechanism of the remote control is effective, ensuring the normal operation time of the remote control and improving the reliability and safety of the device.

[0021] (2) Through voltage division, filtering, and voltage stabilization protection of the acquisition module, the acquisition and stable transmission of the output voltage of the voltage conversion module are effectively realized. At the same time, the amplification module realizes the effective amplification and stable transmission of the output voltage signal of the acquisition module, providing a reliable voltage signal input for the control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is the principle block diagram of the control source early warning detection circuit of the present utility model;

[0024] Figure 2 It is the circuit diagram of the voltage conversion module of the control source early warning detection circuit of the present utility model;

[0025] Figure 3 It is the circuit diagram of the acquisition module of the control source early warning detection circuit of the present utility model;

[0026] Figure 4 It is the circuit diagram of the amplification module of the control source early warning detection circuit of the present utility model;

[0027] Figure 5 It is the circuit diagram of the control module of the control source warning detection circuit of the present utility model;

[0028] Figure 6 It is the circuit diagram of the indication module of the control source warning detection circuit of the present utility model;

[0029] Figure 7 It is the circuit diagram of the display module of the control source warning detection circuit of the present utility model;

[0030] Figure 8 It is the circuit diagram of the voltage stabilization module of the control source warning detection circuit of the present utility model. Detailed implementation manners

[0031] Next, in combination with the implementation manners of the present utility model, the technical solutions in the implementation manners of the present utility model will be clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present utility model, rather than all of the implementation manners. Based on the implementation manners in the present utility model, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] As Figure 1-8 shown, a control source warning detection circuit of the present utility model includes a voltage conversion module 1, a collection module 2, a control module 3 and an indication module 4. Among them, the input end of the voltage conversion module 1 is electrically connected to the external lithium battery power supply end, and the output end of the voltage conversion module 1 is electrically connected to the power supply end of the remote control. The voltage conversion module 1 is used to regulate the output voltage to the remote control; the input end of the collection module 2 is electrically connected to the output end of the voltage conversion module 1, and the output end of the collection module 2 is electrically connected to the input end of the control module 3. The collection module 2 is used to collect the voltage signal output by the voltage conversion module 1 and feedback it to the control module 3; the input end of the indication module 4 is electrically connected to the output end of the control module 3, and is used to indicate the low voltage warning of the remote control.

[0033] It should be noted that first, determine the rated supply voltage of the remote control. The voltage conversion module 1 is responsible for converting the original voltage received from the external lithium battery into the stable voltage required for the normal operation of the remote control. At this time, the remote control operates normally. During the adjustment process, if the remote control gives a low voltage alarm prompt, it indicates that the low voltage detection mechanism of the remote control is qualified and effective, so as to be able to detect whether the low voltage detection mechanism of the remote control is effective, ensure the normal time of the remote control, and improve the reliability and safety of the device.

[0034] As Figure 2As shown, as a preferred embodiment, the voltage conversion module 1 in this embodiment includes a buck chip U1, capacitors C1, C2, C3, C4, C5, C6, C7, C8, resistors R1, R2, a variable resistor VR1, and a filter inductor L1. Among them, pins 10, 11, 12, and 13 of the buck chip U1 are commonly connected and are respectively electrically connected to capacitor C5, capacitor C6, capacitor C7, and the input end of the voltage conversion module 1; the other ends of capacitor C5, capacitor C6, and capacitor C7 are grounded; pins 4 and 11 of the buck chip U1 are commonly connected and are respectively electrically connected to the first end and the second end of the variable resistor VR1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, the output end of the voltage conversion module 1, and the input end of the acquisition module 2. The other ends of capacitor C1, capacitor C2, capacitor C3, and capacitor C4 are commonly grounded. Pin 3 of the buck chip U1 is electrically connected to one end of resistor R1 and resistor R2 respectively. The other end of resistor R1 is electrically connected to the third end of the variable resistor VR1, and the other end of resistor R2 is grounded; one end of the filter inductor L1 is electrically connected to pins 8 and 9 of the buck chip U1, and the other end is electrically connected to pins 6 and 7 of the buck chip U1; pin 1 of the buck chip U1 is electrically connected to capacitor C8, and the other end of capacitor C8 is respectively connected to pins 2 and 15 of the buck chip U1 and grounded.

[0035] It should be noted that the model of the buck chip U1 is TPS63020DSJR. Pins 10, 11, 12, and 13 of the buck chip U1 are commonly connected and serve as the input voltage terminal of the chip, which is connected to capacitor C5, C6, C7, and the input end of the voltage conversion module 1. Capacitors C5, C6, and C7 play a filtering role, reducing the fluctuations and noise of the input voltage, and protecting the chip from transient voltages; pins 4 and 11 of the buck chip U1 are commonly connected and serve as the output voltage terminal of the chip, which is connected to the variable resistor VR1, capacitors C1 to C4, the output end of the voltage conversion module 1, and the input end of the acquisition module 2; the variable resistor VR1 allows the adjustment of the output voltage range, while capacitors C1 to C4 further smooth the output voltage to ensure a stable voltage source for the acquisition module; pins 8, 9, 6, and 7 of the buck chip U1 are connected through the filter inductor L1 to form an LC filter network for filtering high-frequency noise in the output voltage, improving the purity and stability of the output voltage. Pins 1 and 15 of the buck chip U1 are connected to one end of capacitor C8 and grounded. Capacitor C8 plays a decoupling role to prevent external noise from interfering with the internal circuit of the chip.

[0036] Among them, the voltage conversion module 1 realizes the stable conversion of the input voltage and the precise control of the output voltage, providing a reliable and stable power supply guarantee for the subsequent acquisition module.

[0037] AsFigure 3 As shown, as a preferred embodiment, the acquisition module 2 in this embodiment includes a resistor R3, a resistor R4, a resistor R5, a capacitor C9, and a zener diode D1. Among them, the output end of the voltage conversion module 1 is electrically connected to the resistor R3, the other end of the resistor R3 is respectively electrically connected to the resistor R4 and the resistor R5, the other end of the resistor R4 is respectively electrically connected to the capacitor C9, the zener diode D1, and the input end of the control module 3, and the other ends of the resistor R5, the capacitor C9, and the zener diode D1 are grounded.

[0038] It should be noted that the resistors R3, R4, and R5 form a voltage divider; the output voltage of the voltage conversion module 1 first passes through the resistor R3, and then through the series voltage division of R3 with R4 and R5, and finally a scaled-down voltage is generated on the resistor R4; the zener diode D1 is connected in parallel with the resistor R4 to protect the subsequent circuit from damage by excessive voltage; when the voltage after voltage division exceeds the breakdown voltage of the zener diode D1, D1 will conduct, shunting the excess current to the ground, thereby limiting the voltage on the resistor R4 not to exceed its breakdown voltage value; when the output voltage of the voltage conversion module 1 rises abnormally, damage to the subsequent control module 3 is avoided. The capacitor C9 is connected in parallel with the resistor R4 and functions as a filter; it can smooth the voltage signal on the resistor R4, reduce voltage fluctuations caused by power supply fluctuations or noise, and improve the stability and accuracy of the acquired voltage signal.

[0039] Among them, the acquisition module 2 effectively realizes the acquisition and stable transmission of the output voltage of the voltage conversion module 1 through voltage division, filtering, and voltage stabilization protection, and provides a reliable voltage signal input for the control module 3.

[0040] This embodiment further includes an amplification module 5. The input end of the amplification module 5 is electrically connected to the output end of the acquisition module 2, the output end of the amplification module 5 is electrically connected to the input end of the control module 3, and the amplification module 5 is used to amplify the voltage signal output by the voltage conversion module 1 collected.

[0041] As Figure 4 shown, as a preferred embodiment, the amplification module 5 in this embodiment includes an amplification chip U5, a capacitor C22, a capacitor C24, a resistor R6, and a capacitor C23. Among them, the output end of the acquisition module 2 is respectively electrically connected to the capacitor C24 and the positive-phase input end of the amplification chip U5, the inverting input end of the amplification chip U5 is respectively electrically connected to the output end of the amplification chip U5 and the resistor R6, the other end of the resistor R6 is respectively electrically connected to the capacitor C23 and the input end of the control module 3, the power supply end of the amplification chip U5 is respectively electrically connected to an external power supply and the capacitor C22, and the grounding ends of the capacitor C22, the capacitor C24, the capacitor C23, and the amplification chip U5 are respectively grounded.

[0042] It should be noted that the non-inverting input terminal of the amplification chip U5 receives the voltage signal from the acquisition module 2. A negative feedback loop is formed by connecting a resistor R6 between the inverting input terminal and the output terminal of the amplification chip U5. This enables the circuit to have a stable amplification factor and good linearity. The amplification module 5 realizes the effective amplification and stable transmission of the output voltage signal of the acquisition module 2 by adopting a negative feedback amplification circuit and reasonable power supply decoupling, signal filtering and other measures, improving the performance and reliability of the entire voltage detection system.

[0043] As Figure 6 shown, as a preferred embodiment, the indication module 4 in this embodiment includes a resistor R23 and a light-emitting diode D5. One end of the resistor R23 is electrically connected to the output of the control module 3, the other end of the resistor R23 is electrically connected to the positive electrode of the light-emitting diode D5, and the negative electrode of the light-emitting diode D5 is grounded.

[0044] It should be noted that the indication module 4 plays a role of visual feedback. It drives the lighting and extinguishing of the light-emitting diode D5 through the output signal of the control module 3, thereby providing a status indication to the user or the system.

[0045] This embodiment further includes a display module 6. The input end of the display module 6 is electrically connected to the output end of the control module 3 and is used to display the voltage signal output by the voltage conversion module 1.

[0046] As Figure 7 shown, as a preferred embodiment, the display module 6 in this embodiment includes a display screen, a resistor R10, a resistor R11, a bidirectional breakdown diode D3, a bidirectional breakdown diode D2, and a communication interface CN1. Among them, pin 3 of the communication interface CN1 is electrically connected to one end of the resistor R10 and the bidirectional breakdown diode D2 respectively. The other end of the resistor R10 is electrically connected to the feedback control chip U7. Pin 2 of the communication interface CN1 is electrically connected to one end of the resistor R11 and the bidirectional breakdown diode D3 respectively. The other end of the resistor R11 is electrically connected to the feedback control chip U7. The other ends of the bidirectional breakdown diode D3 and the bidirectional breakdown diode D2 are grounded respectively. The communication interface CN1 is electrically connected to the display screen through USB communication.

[0047] It should be noted that the display screen is an LCD screen. After the voltage signal output by the voltage conversion module 1 is processed, it is sent to the display module 6 through the control module 3. The feedback control chip U7 in the display module 6 receives the data from the control module 3 and performs necessary processing. The processed data is sent to the display screen through the USB communication protocol of the communication interface CN1. After receiving the data, the display screen presents it in a visual manner for the user to view. Among them, during the data transmission process, the bidirectional breakdown diodes D2 and D3 protect the communication interface CN1 and the subsequent circuit from overvoltage impact; the resistors R10 and R11 play the role of current limiting and voltage division to ensure the stability and safety of the circuit.

[0048] This embodiment further includes a voltage stabilizing module 7. Among them, the input end of the voltage stabilizing module 7 is electrically connected to the external lithium battery power supply end, and the output end of the voltage stabilizing module 7 is respectively electrically connected to the control module 3 and the amplification module 5 for supplying power to them.

[0049] As Figure 8 shown, as a preferred embodiment, the voltage stabilizing module 7 in this embodiment includes a voltage stabilizing chip U2, a capacitor C10, a capacitor C11, a capacitor C12, and a capacitor C13. Among them, the pin 1 of the voltage stabilizing chip U2 is respectively electrically connected to the pin 3, the capacitor C13, the capacitor C12, and the external lithium battery power supply end. The capacitor C13 and the capacitor C12 are commonly grounded with the pin 2 of the voltage stabilizing chip U2. The pin 5 of the voltage stabilizing chip U2 is respectively electrically connected to the capacitor C10, the capacitor C11, and the output end of the voltage stabilizing module 7. The other ends of the capacitor C10 and the capacitor C11 are commonly grounded, and the output voltage of the voltage stabilizing module 7 is 3.3V.

[0050] It should be noted that the voltage provided by the external lithium battery is input through the pin 1 of the voltage stabilizing chip U2. The internal circuit of the voltage stabilizing chip U2 converts the input voltage into a stable 3.3V output voltage and outputs it through the pin 5. During the conversion process, the capacitors C12 and C13 filter out the high-frequency noise in the input voltage to ensure that the voltage stabilizing chip U2 can receive a stable input voltage; at the same time, the capacitors C10 and C11 filter out the high-frequency noise in the output voltage to ensure that the output voltage of the voltage stabilizing module 7 is a smooth and stable 3.3V. The pin 2 of the voltage stabilizing chip U2 is usually used for grounding to provide a stable reference potential.

[0051] Working principle:

[0052] The external lithium battery provides electrical energy for the voltage conversion module 1. The voltage conversion module 1 converts the voltage provided by the lithium battery into a stable voltage required by the remote control and outputs it to the power supply terminal of the remote control. Through voltage division, filtering, and voltage stabilization protection, the acquisition and stable transmission of the output voltage of the voltage conversion module 1 are effectively realized, providing a reliable voltage signal input for the control module 3. The voltage signal enters the amplification module 5 to effectively amplify and stably transmit the output voltage signal of the acquisition module 2, and then enters the control module 3, where it is compared with a preset low-voltage warning threshold. If the detected voltage is lower than the preset low-voltage warning threshold, the control module 3 generates a control signal and sends it to the indication module 4 to make the light-emitting diode D5 emit light. During the adjustment process, if the low-voltage warning threshold is reached and the remote control simultaneously gives a low-voltage alarm prompt, it indicates that the low-voltage detection mechanism of the remote control is qualified and effective. Moreover, after collecting the voltage, the output voltage value is displayed in real time through the display screen.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control source early warning detection circuit, characterized in that: It includes a voltage conversion module (1), a collection module (2), a control module (3) and an indication module (4). Among them, The input end of the voltage conversion module (1) is electrically connected to the external lithium battery power supply end, and the output end of the voltage conversion module (1) is electrically connected to the power supply end of the remote control. The voltage conversion module (1) is used to regulate the output voltage to the remote control. The input end of the collection module (2) is electrically connected to the output end of the voltage conversion module (1), and the output end of the collection module (2) is electrically connected to the input end of the control module (3). The collection module (2) is used to collect the voltage signal output by the voltage conversion module (1) and feedback it to the control module (3). The input end of the indication module (4) is electrically connected to the output end of the control module (3), and is used to indicate the low voltage warning of the remote control.

2. The control source warning detection circuit according to claim 1, wherein: The voltage conversion module (1) includes a step-down chip U1, capacitors C1, C2, C3, C4, C5, C6, C7, C8, resistors R1, R2, a variable resistor VR1 and a filter L1. Among them, pins 10, 11, 12 and 13 of the step-down chip U1 are commonly connected and are respectively electrically connected to capacitors C5, C6, C7 and the input end of the voltage conversion module (1); the other ends of capacitors C5, C6 and C7 are grounded; pins 4 and 11 of the step-down chip U1 are commonly connected and are respectively electrically connected to the first end and the second end of the variable resistor VR1, capacitors C1, C2, C3, C4, the output end of the voltage conversion module (1) and the input end of the collection module (2). The other ends of capacitors C1, C2, C3 and C4 are commonly grounded. Pin 3 of the step-down chip U1 is respectively electrically connected to one end of resistors R1 and R2. The other end of resistor R1 is electrically connected to the third end of the variable resistor VR1, and the other end of resistor R2 is grounded; one end of the filter L1 is electrically connected to pins 8 and 9 of the step-down chip U1, and the other end is electrically connected to pins 6 and 7 of the step-down chip U1; pin 1 of the step-down chip U1 is electrically connected to capacitor C8, and the other end of capacitor C8 is respectively connected to pins 2 and 15 of the step-down chip U1 and grounded.

3. The control source early warning detection circuit according to claim 1, characterized in that: The collection module (2) includes resistors R3, R4, R5, a capacitor C9 and a zener diode D1. Among them, the output end of the voltage conversion module (1) is electrically connected to resistor R3, and the other end of resistor R3 is respectively electrically connected to resistors R4 and R5. The other end of resistor R4 is respectively electrically connected to capacitor C9, the zener diode D1 and the input end of the control module (3). The other ends of resistors R5, capacitor C9 and the zener diode D1 are grounded.

4. The control source early warning detection circuit according to claim 3, characterized in that: It also includes an amplification module (5). The input end of the amplification module (5) is electrically connected to the output end of the collection module (2), and the output end of the amplification module (5) is electrically connected to the input end of the control module (3). The amplification module (5) is used to amplify the voltage signal output by the voltage conversion module (1) collected.

5. The control source warning detection circuit according to claim 4, wherein: The amplification module (5) includes an amplification chip U5, a capacitor C22, a capacitor C24, a resistor R6, and a capacitor C23. Among them, the output end of the acquisition module (2) is electrically connected to the positive-phase input end of the capacitor C24 and the amplification chip U5 respectively. The inverting input end of the amplification chip U5 is electrically connected to the output end of the amplification chip U5 and the resistor R6 respectively. The other end of the resistor R6 is electrically connected to the capacitor C23 and the input end of the control module (3) respectively. The power supply end of the amplification chip U5 is electrically connected to an external power supply and the capacitor C22 respectively. The grounding ends of the capacitor C22, the capacitor C24, the capacitor C23, and the amplification chip U5 are grounded respectively.

6. The control source warning detection circuit according to claim 1, wherein: The indication module (4) includes a resistor R23 and a light-emitting diode D5. One end of the resistor R23 is electrically connected to the output of the control module (3), and the other end of the resistor R23 is electrically connected to the positive electrode of the light-emitting diode D5. The negative electrode of the light-emitting diode D5 is grounded.

7. The control source early warning detection circuit according to claim 1, characterized in that: It further includes a display module (6). The input end of the display module (6) is electrically connected to the output end of the control module (3) and is used to display the voltage signal output by the voltage conversion module (1).

8. The control source warning detection circuit according to claim 7, characterized in that: The display module (6) includes a display screen, a resistor R10, a resistor R11, a bidirectional breakdown diode D3, a bidirectional breakdown diode D2, and a communication interface CN1. Among them, pin 3 of the communication interface CN1 is electrically connected to one end of the resistor R10 and the bidirectional breakdown diode D2 respectively. The other end of the resistor R10 is electrically connected to the feedback control chip U7. Pin 2 of the communication interface CN1 is electrically connected to one end of the resistor R11 and the bidirectional breakdown diode D3 respectively. The other end of the resistor R11 is electrically connected to the feedback control chip U7. The other ends of the bidirectional breakdown diode D3 and the bidirectional breakdown diode D2 are grounded respectively. The communication interface CN1 is electrically connected to the display screen through USB communication.

9. The control source early warning detection circuit according to claim 5, characterized in that: It further includes a voltage stabilization module (7). Among them, the input end of the voltage stabilization module (7) is electrically connected to the power supply end of an external lithium battery, and the output end of the voltage stabilization module (7) is electrically connected to the control module (3) and the amplification module (5) respectively for supplying power to them.

10. The control source warning detection circuit according to claim 9, characterized in that: The voltage stabilization module (7) includes a voltage stabilization chip U2, a capacitor C10, a capacitor C11, a capacitor C12, and a capacitor C13. Among them, pin 1 of the voltage stabilization chip U2 is electrically connected to pin 3, the capacitor C13, the capacitor C12, and the power supply end of the external lithium battery respectively. The capacitor C13, the capacitor C12, and pin 2 of the voltage stabilization chip U2 are grounded in common. Pin 5 of the voltage stabilization chip U2 is electrically connected to the capacitor C10, the capacitor C11, and the output end of the voltage stabilization module (7) respectively. The other ends of the capacitor C10 and the capacitor C11 are grounded in common. The output voltage of the voltage stabilization module (7) is 3.3V.

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