An output current control circuit, system and method

Abstract

The present invention belongs to the technical field of current control, and provides an output current control circuit, a system and a method. The output current control circuit includes: a power input terminal, a first filtering module, a power management module, a second filtering module, and a voltage regulation module; the power input terminal is electrically connected to an external power supply and the first filtering module respectively; the first filtering module is electrically connected to the power management module; the power management module is also electrically connected to the second filtering circuit and the voltage regulation module; the second filtering circuit is also electrically connected to the voltage regulation module. The present invention can improve the working efficiency and stability of the output current control circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of current control, and in particular relates to an output current control circuit, system and method. Background Art

[0002] Existing circuits with output current control and management are susceptible to input limitations, such as low battery charge or harsh, interference-prone operating environments. Using a flashlight in such harsh, interference-prone environments can reduce driver efficiency or even render it inoperable. This demonstrates the low efficiency and poor stability of existing output current control and management circuits. Summary of the Invention

[0003] The present invention provides an output current control circuit, aiming to solve the problems of low working efficiency and poor stability of existing output current control management circuits.

[0004] The present invention is implemented in this way, providing an output current control circuit, including: a power input end, a first filter module, a power management module, a second filter module, and a voltage regulation module; the power input end is electrically connected to an external power supply and the first filter module respectively; the first filter module is electrically connected to the power management module; the power management module is also electrically connected to the second filter circuit and the voltage regulation module; the second filter circuit is also electrically connected to the voltage regulation module.

[0005] Furthermore, the voltage regulation module includes a resistor R1, a resistor R2, a resistor R3, a MOS tube Q1, an LED lamp and a current output terminal;

[0006] One end of the resistor R1 is electrically connected to the first output end of the power management module, the other end of the resistor R1 is electrically connected to one end of the resistor R2 and the resistor R3 respectively, the other end of the resistor R2 is electrically connected to the ground, one end of the resistor R3 is also electrically connected to the source of the MOS tube, and the other end of the resistor R3 is electrically connected to the second output end of the power management module and the gate of the MOS tube Q1, the drain of the MOS tube Q1 is electrically connected to the LED lamp, and the LED lamp is electrically connected to the current output end.

[0007] Furthermore, the first filtering module includes a capacitor C1, one end of the capacitor C1 is electrically connected to the external power supply and the first input end of the power management module, and the other end of the capacitor C1 is electrically connected to the second input end of the power management module.

[0008] Further, the second filtering module includes a capacitor C2. One end of the capacitor C2 is electrically connected to the wire between the first output end of the power management module and the resistor R2, and the other end of the capacitor C2 is grounded.

[0009] An embodiment of the present invention further provides an output current control system, including a driving circuit, a key and power display circuit, a lighting device, an indicator light, a charging interface, and the output current control circuit as described above;

[0010] The driving circuit is electrically connected to the key and power display circuit, the lighting device, the output current control circuit, and the charging interface respectively;

[0011] The indicator light is electrically connected to the output current control circuit.

[0012] An embodiment of the present invention further provides an output current control method, and the method includes the steps of:

[0013] Obtain a preset current value, and the preset current value changes according to a preset gradually decreasing mode;

[0014] Adjust the output current according to the preset current value.

[0015] Further, the method further includes:

[0016] Complete system initialization;

[0017] Judge whether a start signal is received. If the start signal is received, execute the step of obtaining the preset current value;

[0018] If the start signal is not received, repeat the step of completing system initialization.

[0019] Further, the step of adjusting the output current according to the preset current value includes:

[0020] Perform analog-to-digital conversion on the preset current value to obtain a current digital signal corresponding to the preset current value;

[0021] Output a corresponding feedback signal according to the current digital signal, and adjust the output current according to the feedback signal.

[0022] Further, the step of obtaining the preset current value includes:

[0023] Read the preset current value from a preset register, and the preset current value is stored in the preset register.

[0024] Further, the method further includes:

[0025] Send the adjusted output current to the display device for display.

[0026] The beneficial effects achieved by the present invention: By presetting the management of the current between the input and output ends, the output current at the backend can be gradually decreased according to a preset gradual decrease mode, so that the strong light can gradually transition from strong light to weak light to meet the optical requirements of the human eye. Furthermore, the working efficiency and stability of the output current control circuit are improved. Description of the Drawings

[0027] Figure 1 is a module diagram of an output current control circuit provided by the present invention;

[0028] Figure 2 is a circuit diagram of an output current control circuit provided by the present invention;

[0029] Figure 3 is a module diagram of an output current control system provided by the present invention;

[0030] Figure 4 is a flowchart of an output current control method provided by the present invention. Detailed Embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] In the embodiments of the present invention, by presetting the management of the current between the input and output ends, the output current at the backend can be gradually decreased according to a preset gradual decrease mode, so that the strong light can gradually transition from strong light to weak light to meet the optical requirements of the human eye. Furthermore, the working efficiency and stability of the output current control circuit are improved.

[0033] Example 1

[0034] Refer to Figure 1 as shown Figure 1 is a module diagram of an output current control circuit provided by the present invention.

[0035] The output current control circuit 7 includes: a power input terminal 1, a first filtering module 2, a power management module 3, a second filtering module 4, and a voltage regulation module 5; the power input terminal 1 is electrically connected to an external power supply and the first filtering module 2 respectively; the first filtering module 2 is electrically connected to the power management module 3; the power management module 3 is also electrically connected to the second filtering circuit and the voltage regulation module 5; the second filtering circuit is also electrically connected to the voltage regulation module 5.

[0036] Among them, the above external power supply is powered by 18650 or 26650 lithium batteries. The above first filtering module 2 is used to filter the DC voltage of the external power supply, so that the voltage signal reaching the power management module 3 is a stable DC voltage signal.

[0037] The above power management module 3 is the control center of the entire output current control circuit 7, and is used to control the gradually decreasing adjustment function of the output current according to a preset program. The startup and working voltage of the power management module 3 are provided by the external power supply. The power consumption of the power management module 3 is low, so the heat generation of the entire module is small. Therefore, the efficiency of the entire output current control circuit 7 is very high. The external power supply also constitutes the enable signal of the power management module 3 and is controlled by a single-chip microcomputer.

[0038] The above second filtering module 4 is used to filter out the noise ripple current that may appear at the output end. Ensure that the output voltage signal reaching the power management module 3 is extremely stable.

[0039] The above voltage adjustment module 5 is used to adjust the output current.

[0040] In the embodiment of the present invention, as Figure 2 shown, the voltage adjustment module 5 includes a resistor R1, a resistor R2, a resistor R3, a MOS transistor Q1, an LED lamp, and a current output terminal 6. One end of the resistor R1 is electrically connected to the first output terminal of the power management module 3, and the other end of the resistor R1 is respectively electrically connected to one end of the resistor R2 and the resistor R3. The other end of the resistor R2 is electrically connected to the ground. One end of the resistor R3 is also electrically connected to the source electrode of the MOS transistor. The other end of the resistor R3 is electrically connected to the second output terminal of the power management module 3 and the gate electrode of the MOS transistor Q1. The drain electrode of the MOS transistor Q1 is electrically connected to the LED lamp, and the LED lamp is electrically connected to the current output terminal 6.

[0041] Specifically, at the beginning, the voltage across the LED lamp is stable, that is, the working current of the LED lamp is a constant current value and remains unchanged. As the preset time elapses, the voltage across the LED lamp decreases accordingly. The second output terminal (pin 5) will feedback the working state of the MOS transistor Q1 to adjust the voltage across the LED lamp, so that it gradually decreases. It changes according to the preset gradually decreasing mode set by the program.

[0042] In the embodiment of the present invention, as Figure 2 shown, the first filtering module 2 includes a capacitor C1. One end of the capacitor C1 is electrically connected to the external power supply and is electrically connected to the first input terminal of the power management module 3. The other end of the capacitor C1 is electrically connected to the second input terminal of the power management module 3.

[0043] Specifically, the DC voltage received at the input end of the power management module 3 passes through the capacitor C1. The capacitor C1 mainly functions as a filter to remove the noise components in the DC voltage, so that the voltage signal reaching the power management module 3 is a stable DC signal. After reaching the power management module 3, the power management module 3 processes the voltage and controls the voltage magnitudes of the PWM output to the first output end (pin 4) and the second output end (pin 5) of the power management module 3 through a preset program, and then transmits them to the voltage regulation module 5 to achieve output current regulation.

[0044] In the embodiment of the present invention, as Figure 2 shown, the second filtering module 4 includes a capacitor C2. One end of the capacitor C2 is electrically connected to the connection line between the first output end of the power management module 3 and the resistor R2, and the other end of the capacitor C2 is grounded.

[0045] Specifically, the capacitor C2 is a simple filtering circuit that filters out the possible noise ripple current at the first output end of the power management module 3. Ensure that the output voltage signal reaching the power management module 3 is extremely stable.

[0046] In the embodiment of the present invention, by presetting the management of the current between the input and output ends, the output current at the backend can be gradually decreased according to a preset gradual decrease mode, so as to realize the gradual transition of strong light to weak light to adapt to the optical needs of the human eye. Furthermore, the working efficiency and stability of the output current control circuit 7 are improved.

[0047] Example 2

[0048] As Figure 3 shown, the embodiment of the present invention also provides an output current control system. The output current control system includes a driving circuit 10, a key and power display circuit 9, a lighting device 8, an indicator light 12, a charging interface 11, and the output current control circuit 7 provided in the above embodiment. The driving circuit 10 is electrically connected to the key and power display circuit 9, the lighting device 8, the output current control circuit 7, and the charging interface 11 respectively. The indicator light 12 is electrically connected to the output current control circuit 7.

[0049] Specifically, the above driving circuit 10 includes a controller, such as a single-chip microcomputer. The above key and power display circuit 9 includes a key circuit and a power display circuit. The key circuit facilitates the user to control the output current control system. The power display circuit is used to query and display the power of the output current control system. The above lighting device 8 can be a flashlight, a lamp or other lighting devices. The above indicator light 12 plays a prompting role. The charging interface 11 is used to charge the output current control system.

[0050] In an embodiment of the present invention, the output current control circuit 7 supplies power to the lighting device 8, the indicator light 12, etc., enabling the lighting device 8 to operate stably and efficiently. For example, the lighting device 8 can be an explosion-proof strong light work lamp, which can truly achieve efficient power management and control in an explosion-proof and complex environment, achieving the working effect of the lamp being portable and highly bright.

[0051] Example 3

[0052] As Figure 4 shown, an embodiment of the present invention also provides an output current control method, and the method includes the steps:

[0053] Step 101: Obtain a preset current value, and the preset current value changes according to a preset gradually decreasing mode.

[0054] In an embodiment of the present invention, step 101 includes: reading the preset current value from a preset register, and the preset current value is stored in the preset register.

[0055] Specifically, the above-mentioned preset current value is preset and stored in the register. The above-mentioned preset gradually decreasing mode is a preset current decreasing method. For example, the current corresponding to strong light decreases to the current corresponding to weak light according to a certain current value in the gradually decreasing process. This can achieve a slow transition from strong light to weak light to adapt to the optical needs of the human eye.

[0056] Step 102: Adjust the output current according to the preset current value.

[0057] In an embodiment of the present invention, step 102 includes: the step of adjusting the output current according to the preset current value includes: performing analog-to-digital conversion on the preset current value to obtain a current digital signal corresponding to the preset current value. Output a corresponding feedback signal according to the current digital signal, and adjust the output current according to the feedback signal.

[0058] Among them, the above-mentioned feedback signal can be a feedback voltage signal. Specifically, since the preset current value changes according to the preset gradually decreasing mode, as time goes by, when adjusting the output current according to the obtained preset current, the output current also changes according to the preset gradually decreasing mode. In this way, the output current can be adjusted through the preset gradually decreasing mode, making the output current at the output end extremely fine, and the output current accuracy can reach 5 mA.

[0059] In an embodiment of the present invention, the method further includes:

[0060] Complete system initialization. Specifically, initializing the system can facilitate the adjustment of the output current.

[0061] Determine whether a start signal is received. If the start signal is received, execute the step of obtaining a preset current value. If the start signal is not received, repeat the step of completing system initialization.

[0062] Specifically, the start signal can be a switch signal. When it is necessary to control the output current, the start signal needs to be triggered so that the output current control circuit works to complete the control of the output current. Of course, if the start signal is not received, it means that there is no need to control the output current, and the initialization state is maintained.

[0063] In an embodiment of the present invention, the method further includes: sending the adjusted output current to a display device for display. Specifically, the adjusted output current is displayed on the display device. Users can intuitively understand the magnitude of the output current corresponding to the brightness of the controlled lamp, thereby meeting the user's brightness requirements.

[0064] In an embodiment of the present invention, by obtaining a preset current value, the preset current value changes according to a preset gradually decreasing mode; the output current is adjusted according to the preset current value. In this way, the magnitude of the output current can be adjusted and managed in a preset gradually decreasing mode according to the preset current value, making the output current extremely fine, thereby improving the working efficiency and stability of the output current control circuit. Thus, the lighting device can be realized to gradually transition from strong light to weak light to adapt to the optical requirements of the human eye.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An output current control circuit, characterized in that, Comprising: A power input terminal, a first filtering module, a power management module, a second filtering module, and a voltage regulation module; The power input terminal is electrically connected to an external power supply and the first filtering module respectively; The first filtering module is electrically connected to the power management module. The first filtering module includes a capacitor C1. One end of the capacitor C1 is electrically connected to the power input terminal and electrically connected to the first input terminal of the power management module. The other end of the capacitor C1 is electrically connected to the second input terminal of the power management module. The power management module controls the gradually decreasing regulation function of the output current according to a preset program; The power management module is also electrically connected to the second filtering module and the voltage regulation module; The second filtering module is also electrically connected to the voltage regulation module. The voltage regulation module includes a resistor R1, a resistor R2, a resistor R3, a MOS transistor Q1, an LED lamp, and a current output terminal. One end of the resistor R1 is electrically connected to the first output terminal of the power management module. The other end of the resistor R1 is electrically connected to one ends of the resistor R2 and the resistor R3 respectively. The other end of the resistor R2 is grounded. One end of the resistor R3 is also electrically connected to the source of the MOS transistor Q1. The other end of the resistor R3 is electrically connected to the second output terminal of the power management module and the gate of the MOS transistor Q1. The drain of the MOS transistor Q1 is electrically connected to the LED lamp. The LED lamp is electrically connected to the current output terminal; The second filtering module includes a capacitor C2. One end of the capacitor C2 is electrically connected to the connection line between the first output terminal of the power management module and the resistor R2. The other end of the capacitor C2 is grounded.

2. An output current control system, characterized in that, Comprising a drive circuit, a key and power display circuit, a lighting device, an indicator light, a charging interface, and the output current control circuit according to claim 1; The drive circuit is electrically connected to the key and power display circuit, the lighting device, the output current control circuit, and the charging interface respectively; The indicator light is electrically connected to the output current control circuit.

3. An output current control method, the output current control method being executed based on the output current control circuit as described in claim 1, characterized in that, The method includes the steps: Obtaining a preset current value, and the preset current value changes according to a preset gradually decreasing mode; Adjusting the output current according to the preset current value.

4. The output current control method according to claim 3, wherein The method further includes: Completing system initialization; Judging whether a start signal is received. If the start signal is received, execute the step of obtaining the preset current value; If the start signal is not received, repeat the step of completing system initialization.

5. The output current control method according to claim 3, wherein The step of adjusting the output current according to the preset current value includes: Performing analog-to-digital conversion on the preset current value to obtain a current digital signal corresponding to the preset current value; Outputting a corresponding feedback signal according to the current digital signal, and adjusting the output current according to the feedback signal.

6. The output current control method according to claim 3, wherein The step of obtaining the preset current value includes: Reading the preset current value from a preset register, and the preset current value is stored in the preset register.

7. The output current control method according to claim 3, characterized in that The method further includes: Sending the adjusted output current to a display device for display.

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