Constant-current lamp conversion circuit for mower

Abstract

The utility model discloses a constant current lamp circuit for mowing machine, including power supply output module, isolation module and operational amplifier module, the output terminal of power supply output module is connected with the input terminal of operational amplifier module, the output terminal of operational amplifier module is divided into two paths, one path is connected with the isolation module, and the other path is connected with light emitting circuit. According to the utility model, the voltage change during charging is detected through the operational amplifier module, under the normal charging condition, the charging voltage is lower than the comparison voltage of the operational amplifier module, and the operational amplifier module outputs a low level, so that the red lamp of the light-emitting circuit is lightened; after the battery is fully charged, the loop current of the operational amplifier module is reduced, the charging voltage is higher than the comparison voltage of the operational amplifier module, the operational amplifier module outputs a high level, a green lamp of the light-emitting circuit is lightened, the voltage in the charging process is compared and monitored in real time, the charging condition of the battery can be reflected in real time, and a user can conveniently check the charging condition.

Description

Technical Field

[0001] This utility model relates to a circuit device for operating light-emitting diodes, and more particularly to a constant current lamp-rotating circuit. Background Technology

[0002] In existing technologies, when charging a lawnmower, a charging indicator light is usually installed on the charging device to allow users to intuitively understand the charging status. After the battery is fully charged, the indicator light will turn off or switch to a different color for easy identification. However, most of these methods use simple voltage detection or timer control, which is not only slow to respond but also cannot accurately reflect the actual charging status of the battery in real time, thus causing inconvenience to users. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a constant current rotating lamp circuit for a lawnmower.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A constant current rotating light circuit for a lawnmower includes a power output module, an isolation module, and an operational amplifier module. The output terminal of the power output module is connected to the input terminal of the operational amplifier module. The output terminal of the operational amplifier module is divided into two paths: one path is connected to the isolation module, and the other path is connected to the light-emitting circuit.

[0006] As a further improvement of this utility model, the power output module includes a transformer T1B. The third pin of the transformer T1B is connected to the input terminal of the operational amplifier module through a fast recovery diode D10 and a resistor R28. The fourth pin of the transformer T1B is grounded. An electrolytic capacitor EC7 and a Zener diode ZD2 are connected in parallel between the third pin and the fourth pin. The third pin and the fourth pin constitute the secondary winding.

[0007] As a further improvement of this utility model, a power supply regulator circuit is connected between the power output module and the operational amplifier module. The power supply regulator circuit includes a voltage reference chip U5. The second pin of the voltage reference chip U5 is divided into two paths: one path is connected to the output terminal of the power output module through resistor R30, and the other path is connected to the input terminal of the operational amplifier module through resistors R33 and R34. The third pin of the voltage reference chip U5 is grounded. The first pin of the voltage reference chip U5 is divided into two paths: one path is connected to the second pin of the voltage reference chip U5, and the other path is grounded through capacitor C34.

[0008] As a further improvement of this utility model, the power supply stabilizing circuit is provided with a filter circuit, which includes resistor R31, resistor R32 and capacitor C38. Resistors R31, R32 and capacitor C38 are connected in parallel in sequence, with one end grounded and the other end connected to the output terminal of resistor R33.

[0009] As a further improvement of this utility model, the operational amplifier module includes an operational amplifier U1. The third pin of the operational amplifier U1 is connected to a resistor R33. The second pin of the operational amplifier U1 is divided into two paths: one path is connected to the negative power supply through a resistor R39, and the other path is connected to the signal ground through a capacitor C37. The first pin of the operational amplifier U1 serves as the output terminal and is connected to the isolation module. A resistor R40 and a capacitor C36 are connected between the first and second pins of the operational amplifier U1. The fifth pin of the operational amplifier U1 is divided into two paths: one path is connected to the power supply regulator circuit, and the other path is connected to the light-emitting circuit through a resistor R36. The sixth pin of the operational amplifier U1 is connected to the negative power supply through a resistor R37. A capacitor C35 and a resistor R35 are connected between the fifth and sixth pins of the operational amplifier U1. The seventh pin of the operational amplifier U1 serves as the output terminal and is connected to the light-emitting circuit.

[0010] As a further improvement of this utility model, the light-emitting circuit includes light-emitting diodes LED1 and LED2. The negative terminal of LED1 is grounded through Zener diode ZD6, and the positive terminal is connected to the power supply through resistor R38. The negative terminal of LED2 is connected to pin 7 of operational amplifier U1, and the positive terminal is connected to the power supply through resistor R38.

[0011] As a further improvement of this utility model, the isolation module includes an optocoupler U2. The third pin of the optocoupler U2 is divided into two paths: one path is connected to the power supply through resistor R53, and the other path is connected to the first pin of the operational amplifier U1 through resistor R44 and diode D11. The fourth pin of the optocoupler U2 is divided into two paths: one path is connected to the positive power supply through capacitor C22, resistor R43 and resistor R42, and the other path is connected to the second pin of the voltage reference chip U4. The first pin of the voltage reference chip U4 is divided into two paths: one path is connected to resistor R42, and the other path is grounded through resistor R66. Resistors R36 and R70 are connected in series in parallel with resistor R66.

[0012] The beneficial effects of this utility model are as follows: This utility model detects voltage changes during charging through an operational amplifier module. Under normal charging conditions, the charging voltage is lower than the comparison voltage of the operational amplifier module, so the operational amplifier module outputs a low level, illuminating the red light in the light-emitting circuit. After the battery is fully charged, the loop current of the operational amplifier module decreases, the charging voltage is higher than the comparison voltage of the operational amplifier module, so the operational amplifier module outputs a high level, illuminating the green light in the light-emitting circuit. This allows for real-time comparison and monitoring of the voltage during the charging process, reflecting the battery's charging status in real time and providing convenient viewing for the user. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0016] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0017] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0018] Reference Figure 1 A constant current rotating light circuit for a lawnmower includes a power output module, an isolation module, and an operational amplifier module. The output terminal of the power output module is connected to the input terminal of the operational amplifier module. The output terminal of the operational amplifier module is divided into two paths: one path is connected to the isolation module, and the other path is connected to the light-emitting circuit.

[0019] The power output module includes a transformer T1B. Pin 3 of transformer T1B is connected to the input terminal of the operational amplifier module via a fast recovery diode D10 and a resistor R28. Pin 4 of transformer T1B is grounded. An electrolytic capacitor EC7 and a Zener diode ZD2 are connected in parallel between pins 3 and 4. Pins 3 and 4 constitute the secondary winding. In this embodiment, pins 1 and 2 of transformer T1B constitute the primary winding, used to connect to a conventional power supply circuit. Figure 1 The VIN identifier indicates the power supply, and the secondary winding output power supply formed by the 3rd and 4th pins is identified as VDD.

[0020] A power supply regulator circuit is connected between the power output module and the operational amplifier module. This power supply regulator circuit includes a voltage reference chip U5. Pin 2 of the voltage reference chip U5 is split into two paths: one path connects to the output terminal of the power output module via resistor R30, and the other path connects to the input terminal of the operational amplifier module via resistors R33 and R34. Pin 3 of the voltage reference chip U5 is grounded. Pin 1 of the voltage reference chip U5 is also split into two paths: one path connects to pin 2 of the voltage reference chip U5, and the other path connects to ground via capacitor C34. In this embodiment, the voltage reference chip U5 uses the TL431 chip model. The TL431 has high-precision voltage reference characteristics and can flexibly set the regulated voltage value. Specifically, the voltage reference chip U5, based on an internal reference, precisely regulates the output voltage through feedback from pin 1 and the voltage division of resistors R33 and R34.

[0021] The power supply regulator circuit is equipped with a filter circuit, which includes resistors R31 and R32 and capacitor C38. Resistors R31, R32 and C38 are connected in parallel, with one end grounded and the other end connected to the output terminal of resistor R33, to further filter out high-frequency ripple in the voltage and make the voltage input to the operational amplifier module purer.

[0022] The operational amplifier module includes operational amplifier U1. Pin 3 of operational amplifier U1 is connected to resistor R33. Pin 2 of operational amplifier U1 is split into two paths: one path is connected to the negative power supply through resistor R39, and the other path is connected to signal ground through capacitor C37. Pin 1 of operational amplifier U1 serves as the output terminal and is connected to the isolation module. Resistor R40 and capacitor C36 are connected between pin 1 and pin 2 of operational amplifier U1. Pin 5 of operational amplifier U1 is split into two paths: one path is connected to the power supply regulator circuit, and the other path is connected to the light-emitting circuit through resistor R36. Pin 6 of operational amplifier U1 is connected to the negative power supply through resistor R37. Capacitor C35 and resistor R35 are connected between pin 5 and pin 6 of operational amplifier U1. Pin 7 of operational amplifier U1 serves as the output terminal and is connected to the light-emitting circuit. In this embodiment, the operational amplifier U1 is an LM358, which is a dual-channel amplifier. The charging voltage is compared with the comparison voltage inside the operational amplifier U1, and the signal is output in two ways. One way is output to the isolation module to feed the signal back to the front stage or participate in power control, so as to realize signal interaction under electrical isolation. The other way is output to the light-emitting circuit to realize the light-changing function.

[0023] Specifically, the light-emitting circuit includes LED1 and LED2. The cathode of LED1 is grounded through a Zener diode ZD6, and the anode is connected to the power supply through a resistor R38. The cathode of LED2 is connected to pin 7 of operational amplifier U1, and the anode is connected to the power supply through a resistor R38. Under normal charging conditions, pin 5 of operational amplifier U1 is the reference voltage, and the voltage at pin 6 is higher than the reference voltage, causing pin 7 of operational amplifier U1 to output a low level. At this time, LED2 lights up (bright red light), and LED1 is off. After the battery is fully charged, the loop current of the operational amplifier module decreases, and the voltage at pin 5 is higher than the voltage at pin 6, causing pin 7 of operational amplifier U1 to output a high level. At this time, LED1 lights up (bright green light), and LED2 is off. Real-time comparison and monitoring of the voltage during the charging process can reflect the battery charging status in real time, making it convenient for users to check.

[0024] The isolation module includes an optocoupler U2. Pin 3 of the optocoupler U2 is split into two paths: one path connects to the power supply via resistor R53, and the other path connects to pin 1 of the operational amplifier U1 via resistor R44 and diode D11. Diode D11 limits current to prevent excessive current output from damaging the optocoupler U2. Pin 4 of the optocoupler U2 is also split into two paths: one path connects to the positive power supply via capacitor C22, resistors R43 and R42, and the other path connects to pin 2 of the voltage reference chip U4. Pin 1 of the voltage reference chip U4 is split into two paths: one path connects to resistor R42, and the other path connects to ground via resistor R66. Resistors R36 and R70 are connected in series in parallel with resistor R66. In this embodiment, the output signal of pin 1 of the operational amplifier U1 drives the light-emitting end inside the optocoupler U2 via diode D11 and resistor R44. The light from the light-emitting end triggers the receiving end, thereby feeding the signal back to the front stage or participating in power regulation. Pins 1 and 2 of the optocoupler U2 are used to connect to the power regulation part of the conventional power supply circuit for feedback to achieve signal interaction. Specifically, FBL in the figure is used to connect to the feedback pin of the power chip in power regulation.

[0025] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A constant current rotary lamp circuit for a lawnmower, characterised in that It includes a power output module, an isolation module, and an operational amplifier module. The output terminal of the power output module is connected to the input terminal of the operational amplifier module. The output terminal of the operational amplifier module is divided into two paths: one path is connected to the isolation module, and the other path is connected to the light-emitting circuit.

2. The constant current rotating lamp circuit for a lawnmower according to claim 1, characterized in that... The power output module includes a transformer T1B. The third pin of the transformer T1B is connected to the input terminal of the operational amplifier module through a fast recovery diode D10 and a resistor R28. The fourth pin of the transformer T1B is grounded. An electrolytic capacitor EC7 and a Zener diode ZD2 are connected in parallel between the third pin and the fourth pin. The third pin and the fourth pin constitute the secondary winding.

3. The constant current rotary lamp circuit for a lawnmower as defined in claim 2, wherein A power supply regulator circuit is connected between the power output module and the operational amplifier module. The power supply regulator circuit includes a voltage reference chip U5. The second pin of the voltage reference chip U5 is divided into two paths: one path is connected to the output terminal of the power output module through resistor R30, and the other path is connected to the input terminal of the operational amplifier module through resistors R33 and R34. The third pin of the voltage reference chip U5 is grounded. The first pin of the voltage reference chip U5 is divided into two paths: one path is connected to the second pin of the voltage reference chip U5, and the other path is grounded through capacitor C34.

4. The constant current rotary lamp circuit for a lawnmower as defined in claim 3, wherein The power supply regulator circuit is equipped with a filter circuit, which includes resistor R31, resistor R32 and capacitor C38. Resistors R31, R32 and capacitor C38 are connected in parallel, with one end grounded and the other end connected to the output terminal of resistor R33.

5. The constant current rotating lamp circuit for a lawnmower according to claim 3, characterized in that... The operational amplifier module includes operational amplifier U1. Pin 3 of operational amplifier U1 is connected to resistor R33. Pin 2 of operational amplifier U1 is split into two paths: one path is connected to the negative power supply through resistor R39, and the other path is connected to signal ground through capacitor C37. Pin 1 of operational amplifier U1 serves as the output terminal and is connected to the isolation module. Resistor R40 and capacitor C36 are connected between pin 1 and pin 2 of operational amplifier U1. Pin 5 of operational amplifier U1 is split into two paths: one path is connected to the power supply regulator circuit, and the other path is connected to the light-emitting circuit through resistor R36. Pin 6 of operational amplifier U1 is connected to the negative power supply through resistor R37. Capacitor C35 and resistor R35 are connected between pin 5 and pin 6 of operational amplifier U1. Pin 7 of operational amplifier U1 serves as the output terminal and is connected to the light-emitting circuit.

6. The constant rotation lamp circuit for a lawnmower as defined in claim 5, characterized in that The light-emitting circuit includes LED1 and LED2. The negative terminal of LED1 is grounded through Zener diode ZD6, and the positive terminal is connected to the power supply through resistor R38. The negative terminal of LED2 is connected to pin 7 of operational amplifier U1, and the positive terminal is connected to the power supply through resistor R38.

7. The constant current rotating lamp circuit for a lawnmower according to claim 5, characterized in that... The isolation module includes an optocoupler U2. The third pin of the optocoupler U2 is divided into two paths: one path is connected to the power supply through resistor R53, and the other path is connected to the first pin of the operational amplifier U1 through resistor R44 and diode D11. The fourth pin of the optocoupler U2 is divided into two paths: one path is connected to the positive power supply through capacitor C22, resistor R43 and resistor R42, and the other path is connected to the second pin of the voltage reference chip U4. The first pin of the voltage reference chip U4 is divided into two paths: one path is connected to resistor R42, and the other path is grounded through resistor R66. Resistors R36 and R70 are connected in series in parallel with resistor R66.

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