CN-115509165-B - Cigar lighter output circuit and control method thereof

CN115509165BCN 115509165 BCN115509165 BCN 115509165BCN-115509165-B

Abstract

The invention discloses a cigar lighter output circuit which comprises a power circuit and a control circuit, wherein the power circuit is respectively connected with the control circuit and a power supply, the control circuit is used for generating an adjusting signal to be output to the power circuit, the adjusting signal is generated according to output current of the cigar lighter output circuit after being connected with a load, the adjusting signal is adjusted according to the load, the power circuit adjusts a working current limiting point according to the adjusting signal, an initial value of the working current limiting point is set to be larger than a normal working value of the working current limiting point, the cigar lighter output circuit can bear impact current, the working current limiting point is adjusted and changed according to the adjusting signal, and the working current limiting point can be restored to the normal working value of the working current limiting point after the impact current disappears, so that device temperature rise is ensured to meet the requirement of device working specification, and a power part device is enabled to work stably and reliably, and product reliability and a normal working protection mechanism of the load are enhanced.

Inventors

LEI JIANHUA
YOU YONGLIANG
CAI JINWEI
LIN CHENGFANG

Assignees

深圳市德兰明海科技有限公司

Dates

Publication Date: 20260505
Application Date: 20220929

Claims (7)

1. The cigar lighter output circuit of the energy storage power supply is characterized by comprising a power circuit, a control circuit, a cigar lighter input current sampling circuit, an output current calculation circuit and a control circuit, wherein the power circuit is respectively connected with the control circuit and the power supply; The control circuit is used for generating and outputting an adjusting signal to the power circuit, the adjusting signal is generated according to the output current of the cigar lighter after the output circuit is connected with a load, so that the adjusting signal can be adjusted and changed according to the load, the adjusting signal is a PWM signal, when the output current is smaller than a working current limit point in normal operation, the duty ratio of the PWM signal is 100%, when the output current is larger than the working current limit point in normal operation, after the output current lasts for a preset time, the duty ratio of the PWM is reduced to track and limit the output current to the working current limit point in normal operation; the control circuit calculates the output current of the power circuit as follows: Wherein V bat is the battery voltage, I in is the input current of the cigar lighter, and V out is the voltage output by the cigar lighter; Output efficiency for different percentage power segments; The control circuit outputs the following regulating signal to the power circuit according to the output current, when the output current is smaller than the working current limiting point in normal operation, the regulating signal is output to keep the working current limiting point unchanged at an initial value, when the output current is larger than the working current limiting point in normal operation, the regulating signal is output to lower the working current limiting point, and the magnitude of the output current is tracked and stabilized in the working current limiting point in normal operation; the power circuit adjusts the working current limiting point according to the adjusting signal, and the initial value of the working current limiting point is set to be larger than the normal working value of the working current limiting point, so that the cigar lighter output circuit can bear impact current, and the working current limiting point can be further adjusted and changed according to the adjusting signal, so that the normal working value of the working current limiting point can be restored after the impact current disappears.
2. The cigar lighter output circuit of claim 1, wherein when the output current is greater than the operating limit point during normal operation, the output adjustment signal adjusts the operating limit point down after a predetermined duration of time to track and stabilize the magnitude of the output current within the operating limit point during normal operation.
3. The cigar lighter output circuit according to claim 1, further comprising a current sampling and amplifying circuit, wherein the cigar lighter input current sampling circuit, the current sampling and amplifying circuit and the control circuit are connected in sequence; The cigar lighter input current sampling circuit includes a sampling resistor, connects in cigar lighter current input end, current sampling amplifier circuit with a sampling resistor parallel connection.
4. The cigar lighter output circuit of claim 1, wherein the power circuit comprises a power chip and a first differential sampling input end and a second differential sampling input end of the output current, wherein two pins of the first differential sampling input end and the second differential sampling input end are respectively connected with two ends of a first differential sampling resistor and a second differential sampling resistor, and the output current is collected and fed back to the power chip to realize self-stabilizing control of the output voltage so as to stabilize the output voltage at a preset voltage.
5. The cigar lighter output circuit of claim 1, further comprising an input on-off control circuit, wherein the input on-off control circuit comprises a triode and a switch tube, the triode is connected with the control circuit and receives a control signal from the control circuit so as to control the on-off of the triode, the switch tube is connected between a battery input and a cigar lighter power circuit, the control end of the switch tube is connected with the output end of the triode, when the control signal output by the control circuit is at a low level, the triode is in an off state, the input of the cigar lighter is closed, the cigar lighter stops working, when the control signal is at a high level, the triode is further controlled to be turned on so that the control end of the switch tube is pulled down to a low level, the switch tube is in an on state, the battery is further input to the power circuit, and the cigar lighter starts working.
6. The cigar lighter output circuit of claim 1, further comprising an output voltage sampling circuit coupled between the power circuit and the control circuit, wherein the output voltage sampling circuit comprises a first voltage sampling resistor and a second voltage sampling resistor coupled in series with each other, wherein the first voltage sampling resistor and the second voltage sampling resistor are coupled between a reference voltage and ground, and wherein a terminal to which the first voltage sampling resistor and the second voltage sampling resistor are coupled is a sampling terminal.
7. An energy storage power supply comprising the cigar lighter output circuit as claimed in any one of claims 1 to 6.

Description

Cigar lighter output circuit and control method thereof Technical Field The invention relates to the technical field of electronic cigarette lighters, in particular to a cigarette lighter output circuit and a control method. Background The portable energy storage power supply is small-sized energy storage equipment with a built-in lithium ion battery, has the characteristics of large capacity, high power and safety and portability, can provide a power supply system for stabilizing alternating current/direct current voltage output, and is additionally provided with a plurality of output interfaces of an AC (alternating current input power supply interface), a USB (direct current charger interface), a Type-C and a cigar lighter. The multifunctional outdoor intelligent electric power machine is widely applied, is required to be multifunctional, has continuously improved electric performance, and can be applied to a plurality of scenes such as outdoor tour, emergency disaster relief, medical emergency, outdoor operation and the like. The photovoltaic power generation and energy storage can be utilized, and the photovoltaic power generation and energy storage device is a photovoltaic storage charging and discharging source device for replacing the traditional fuel oil generator. The output overload capability of the cigar lighter of the current portable energy storage power supply is weak when starting, and in order to ensure the normal operation of power supply equipment and an electric load, the output current usually needs to have the maximum battery limit (such as 10 amperes). However, in many cases, the power supply requirements of multiple types of loads cannot be met, and in particular, the small electric type load cannot be started or restarted and cannot work normally because the output current of the battery device after the small electric type load is connected with the battery device is larger than the maximum battery limit. Disclosure of Invention The invention aims to solve the problem of weaker output overload capacity of a cigar lighter of a portable energy storage power supply when the cigar lighter is started. Therefore, the invention provides a cigar lighter output circuit, which comprises a power circuit and a control circuit, wherein the power circuit is respectively connected with the control circuit and a power supply; The control circuit is used for generating an adjusting signal and outputting the adjusting signal to the power circuit, and the adjusting signal is generated according to the output current of the cigar lighter output circuit after the cigar lighter output circuit is connected with a load, so that the adjusting signal can be adjusted and changed according to the load; the power circuit adjusts the working current limiting point according to the adjusting signal, and the initial value of the working current limiting point is set to be larger than the normal working value of the working current limiting point, so that the cigar lighter output circuit can bear impact current, and the working current limiting point can be further adjusted and changed according to the adjusting signal, so that the normal working value of the working current limiting point can be restored after the impact current disappears. In some embodiments, the control circuit outputs the following adjustment signals to the power circuit according to the output current magnitude; When the output current is larger than the working current limiting point in normal operation, the output regulating signal is output to lower the working current limiting point, and the output current is tracked and stabilized in the working current limiting point in normal operation. In some embodiments, the control circuit outputs the following adjustment signals to the power circuit according to the output current magnitude; When the output current is larger than the working current limiting point in normal operation, the output regulating signal regulates the working current limiting point down, and the output current is tracked and stabilized in the working current limiting point in normal operation. In some embodiments, when the output current is greater than the operating limit point in normal operation, the output adjustment signal adjusts the operating limit point down after a predetermined duration, tracks and stabilizes the magnitude of the output current within the operating limit point in normal operation. In some embodiments, the regulating signal is a PWM signal, the duty cycle of the PWM signal is 100% when the output current is less than the operating limit point in normal operation, and the duty cycle of the PWM signal is reduced to track and limit the output current to the operating limit point in normal operation after a predetermined time when the output current is greater than the operating limit point in normal operation. In some embodiments, the cigar lighter output circuit further comprises a cigar lighter