Power supply output adjusting circuit

Abstract

The utility model provides a power supply output adjusting circuit, which is applied to the technical field of battery charging, and comprises a temperature control module used for detecting the temperature of a battery and adjusting an output signal according to a temperature signal, and the output signal of the temperature control module comprises a PWM (Pulse-Width Modulation) signal and a switching signal; the PWM signal is accessed to the secondary feedback module and is used for adjusting the conduction degree of an optocoupler element in the secondary feedback module, the secondary feedback module outputs a feedback signal to the primary control module according to the conduction degree of the optocoupler element, and the feedback signal is used for adjusting an output signal of the primary control module so as to adjust the switching frequency of the switching tube Q1. Therefore, the magnitude of the output current of the transformer T1 is adjusted. The temperature control module monitors the temperature of the battery in real time, adjusts the duty ratio of the PWM signal when the temperature of the battery rises to reduce the output current of the power supply and avoid continuous temperature rise of the battery, and cuts off the power supply through the switching signal to protect the battery when the temperature of the battery is abnormal, so that the safety and reliability of the battery charging system are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery charging technical field, concretely relates to a power output adjusting circuit. BACKGROUND

[0002] Battery charging technology is a technology that provides energy to rechargeable batteries by controlling current and voltage. With the wide application of rechargeable batteries (such as lithium-ion batteries, nickel-cadmium batteries, lead-acid batteries, etc.), the development of charging technology focuses on improving charging efficiency, safety, and battery life.

[0003] However, in the traditional charging circuit, a constant charging current can cause the battery to heat up, and when the battery temperature is too high, it can cause the battery to overheat, damage, or even safety accidents due to continuous charging. SUMMARY

[0004] In view of the above problems in the prior art, the purpose of the utility model is to provide a power output adjusting circuit, which monitors the battery temperature in real time through a temperature control module, adjusts the duty cycle of the PWM signal to reduce the output current of the power supply when the battery temperature rises, avoids continuous heating of the battery, and protects the battery by turning off the power supply when the battery temperature is abnormal, thereby improving the safety and reliability of the battery charging system.

[0005] A power output adjusting circuit, comprising a primary input module, a primary control module, a transformer T1, a secondary output module, a secondary feedback module, and a temperature control module, the primary input module and the primary control module are connected to the primary input end of the transformer T1, the secondary output module and the secondary feedback module are connected to the secondary output end of the transformer T1, the secondary feedback module is also connected to the primary control module, and the temperature control module is connected to the secondary feedback module and the secondary output module respectively;

[0006] The temperature control module is used for detecting the temperature of the battery and adjusting the output signal according to the detected temperature signal, and the output signal of the temperature control module includes a PWM signal and a switching signal;

[0007] The PWM signal is connected to the secondary feedback module, which is used to adjust the conduction degree of the optocoupler element in the secondary feedback module, and the secondary feedback module outputs a feedback signal to the primary control module according to the conduction degree of the optocoupler element, and the feedback signal is used to adjust the output signal of the primary control module to adjust the switching frequency of the switching tube Q1, thereby adjusting the output current size of the transformer T1;

[0008] The switching signal includes a switching signal ON and a switching signal OFF, and the switching signal is connected to the secondary output module to control the output or shutdown of the secondary output module.

[0009] Preferably, the sampling feedback module is further included, connected with the secondary output module and the temperature control module, and used for collecting a sampling current at a sampling resistor R30 in the secondary output module and generating an ADC1 signal transmitted to the temperature control module; and the temperature control module cooperatively controls an output signal of the temperature control module according to a detected temperature signal and the received ADC1 signal.

[0010] Preferably, the primary input module includes a fuse F1, a fuse F2, a capacitor CX1, a capacitor CX2, an inductive filter LF1, an inductive filter LF2 and a rectifier bridge DB1; the input alternating current passes through the fuses F1 and F2 for protection, and then passes through the capacitors CX1 and CX2 and the inductive filters LF1 and LF2 to suppress power grid interference and electromagnetic noise, and then is converted into direct current by the rectifier bridge DB1.

[0011] Preferably, the primary control module includes a main control chip U2, a switch tube Q1, a diode D1 and a voltage stabilizing unit; the main control chip U2 is connected to the direct current voltage converted by the primary input module through the voltage stabilizing unit; an output signal of the main control chip U2 is connected to the switch tube Q1 through the diode D1, used for controlling the switching frequency of the switch Q1; and the switch tube Q1 is connected to the primary input end of the transformer T1.

[0012] Preferably, the secondary output module includes a Schottky diode D6, a capacitor C22, a capacitor C23 and a sampling resistor R30; the secondary output end of the transformer T1 outputs a high-frequency alternating current signal, which is rectified by the Schottky diode D6 to be converted into a direct current signal, and then passes through the capacitors C22 and C23 to filter out ripples in the direct current signal, so that the transformer T1 outputs stable direct current voltage; and the sampling resistor R30 is used for monitoring the size of the output current of the transformer T1 in real time.

[0013] Preferably, the secondary output module is configured with a switch tube Q3, a switch Q4 and a switch tube Q5; the switch tube Q5 is connected to the switching signal of the temperature control module; under normal circumstances, the temperature control module outputs a switching signal ON, so that the switch tubes Q3, Q4 and Q5 are turned on, and the transformer T1 normally outputs; when the battery temperature exceeds a threshold value, the temperature control module outputs a switching signal OFF, so that the switch tubes Q3, Q4 and Q5 are turned off, and the transformer T1 is closed to stop outputting.

[0014] Preferably, the sampling feedback module includes a resistor R32, a resistor R35, a resistor R29 and an amplifier U6A; the resistor R29 is connected to the positive input end of the amplifier U6A; the resistor R32 is connected to the negative input end of the amplifier U6A; the resistor R35 is connected between the negative input end and the output end of the amplifier U6A; and the output end of the amplifier U6A outputs an ADC1 signal and is connected to the power supply chip U3 of the temperature control module.

[0015] Preferably, the temperature control module comprises a temperature detection element NTC and a power supply chip U3, the temperature detection element NTC is used for detecting the battery temperature in real time and converting the temperature signal into a voltage signal input to the power supply chip U3, the power supply chip U3 controls an output signal according to the voltage signal of the temperature detection element NTC and the ADC1 signal of the sampling feedback module, adjusts the output of the secondary feedback module through the output PWM signal, and controls the on-off of the secondary output module through the output switching signal.

[0016] Preferably, the secondary feedback module comprises an amplification unit and an optocoupler element, the PWM signal output by the temperature control module is amplified by the amplification unit and then accessed to the optocoupler element, the size of the optocoupler current output by the optocoupler element is controlled according to the duty ratio of the PWM signal, and the feedback signal formed based on the optocoupler current is accessed to the primary control module.

[0017] The power output adjusting circuit improves the reliability and safety of the battery charging system through the mutual cooperation between the primary input module, the primary control module, the transformer T1, the secondary output module, the secondary feedback module, the temperature control module and the sampling feedback module, adjusts the duty ratio of the PWM signal to reduce the size of the power output current when the battery temperature rises, avoids continuous temperature rise of the battery, but when the battery temperature exceeds the threshold value, the power output is turned off through the switching signal, the battery charging is stopped, and the battery is prevented from being damaged or causing other safety accidents due to the excessively high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0019] Figure 1 is a structural schematic view of the present application;

[0020] Figure 2 is a structural schematic view of the present application;

[0021] Figure 3 is a circuit diagram of the primary input module of the present application;

[0022] Figure 4 is a circuit diagram of the primary control module of the present application;

[0023] Figure 5 is a circuit diagram of the secondary output module of the present application;

[0024] Figure 6 is a feedback module structural schematic view of the present application. DETAILED DESCRIPTION

[0025] Embodiment One

[0026] As shown in Figure 1 , Figure 2 , a power output adjusting circuit includes a primary input module, a primary control module, a transformer T1, a secondary output module, a secondary feedback module, a temperature control module and a sampling feedback module.

[0027] The primary input module and the primary control module are connected to the primary input end of the transformer T1, the secondary output module and the secondary feedback module are connected to the secondary output end of the transformer T1, and the secondary feedback module is further connected to the primary control module. The temperature control module is connected to the secondary feedback module, the sampling feedback module and the secondary output module, and the sampling feedback module is further connected to the secondary output module for collecting the output current of the transformer T1.

[0028] The temperature control module is used for detecting the temperature of the battery on one hand, and receiving the ADC1 signal output by the sampling feedback module on the other hand. The temperature control module adjusts the output signal according to the detected battery temperature signal and the received ADC1 signal, and the output signal includes a PWM signal and a switching signal.

[0029] The PWM signal is input into the secondary feedback module for adjusting the conduction degree of the optocoupler element in the secondary feedback module. The secondary feedback module outputs a feedback signal to the primary control module according to the conduction degree of the optocoupler element, and the feedback signal is used to adjust the output signal of the primary control module to adjust the switching frequency of the switching tube Q1, so as to adjust the output current size of the transformer T1.

[0030] The switching signal includes a switching signal ON and a switching signal OFF, and the switching signal is input into the secondary output module for controlling the on-off of the switching tube Q3, the switching tube Q4 and the switching tube Q5 in the secondary output module. Under normal circumstances, the temperature control module outputs the switching signal ON to make the switching tube Q3, the switching tube Q4 and the switching tube Q5 conductive, and the transformer T1 normally outputs; when the battery temperature exceeds the threshold value, the temperature control module outputs the switching signal OFF to make the switching tube Q3, the switching tube Q4 and the switching tube Q5 off, and the transformer T1 closes the output.

[0031] Specifically, as shown in Figure 3As shown in the figure, the primary input module is used to convert the input AC signal into a DC signal. The primary input module includes a fuse F1, a fuse F2, a capacitor CX1, a capacitor CX2, an inductor filter LF1, an inductor filter LF2 and a rectifier bridge DB1. The input AC power is protected by the fuses F1 and F2 to avoid overcurrent damage, then the power grid interference and electromagnetic noise are suppressed by the capacitors CX1 and CX2 and the inductor filters LF1 and LF2, and the AC power is converted into DC power by the rectifier bridge DB1 to realize the DC input of the transformer T1.

[0032] As shown in the figure, Figure 4 The primary control module includes a main control chip U2, a switch tube Q1, a diode D1 and a voltage stabilizing unit. The main control chip U2 is connected to the DC voltage converted by the primary input module through the voltage stabilizing unit, and the voltage stabilizing unit is used to stabilize the voltage. The output signal of the main control chip U2 is connected to the switch tube Q1 through the diode D1 to control the switching frequency of the switch Q1. The switch tube Q1 is connected to the primary input end of the transformer T1, and the diode D1 is used to protect the switch tube Q1.

[0033] The main control chip U2 adjusts the duty cycle of its output signal according to the feedback signal output by the feedback module connected to the feedback pin, and controls the frequency of the switch tube Q1 turning on and off through the output signal, so that the transformer T1 can form an alternating magnetic field in the primary coil according to the high-frequency switching action of the switch tube Q1, and output corresponding current through the secondary coil.

[0034] As shown in the figure, Figure 5 The secondary output module includes a Schottky diode D6, a capacitor C22, a capacitor C23 and a sampling resistor R30. The secondary output end of the transformer T1 outputs a high-frequency AC signal, which is rectified by the Schottky diode D6 to convert it into a DC signal, and then filtered by the capacitors C22 and C23 to remove the ripples in the DC signal, so that the transformer T1 can output stable DC voltage. In addition, the sampling resistor R30 is used to monitor the size of the output current of the transformer T1 in real time.

[0035] Further, in order to improve the safety of the circuit, switch tubes Q3, Q4 and Q5 are configured in the secondary output module. The switch tube Q5 is connected to the switching signal of the feedback module and is controlled to turn on by the switching signal, so that the switch tube Q5 controls the on-off of the switches Q3 and Q4.

[0036] As shown in the figure, Figure 6 The secondary feedback module, the temperature control module and the sampling feedback module constitute the feedback module. The temperature control module is connected to the secondary feedback module and the sampling feedback module respectively.

[0037] The sampling feedback module is used for collecting the sampling current at the sampling resistor R30 in the secondary output module, and converting the collected current signal into an ADC1 signal input to the temperature control module. The sampling feedback module includes a resistor R32, a resistor R35, a resistor R29, and an amplifier U6A. The resistor R29 is connected to the positive input terminal of the amplifier U6A. The resistor R32 is connected to the negative input terminal of the amplifier U6A. The resistor R35 is connected between the negative input terminal and the output terminal of the amplifier U6A. The output terminal of the amplifier U6A outputs the ADC1 signal and is connected to the power supply chip U3 of the temperature control module.

[0038] The temperature control module includes a temperature detection element NTC and a power supply chip U3. The temperature detection element NTC is used for real-time detection of the battery temperature and converts the temperature signal into a voltage signal input to the power supply chip U3.

[0039] The power supply chip U3 controls the output signal according to the voltage signal of the temperature detection element NTC and the ADC1 signal of the sampling feedback module. The PWM signal output by the power supply chip U3 adjusts the output of the secondary feedback module and controls the on-off of the secondary output module through the switch signal output. The duty cycle of the PWM signal is related to the voltage signal of the temperature detection element NTC and the ADC1 signal of the sampling feedback module.

[0040] The secondary feedback module includes an amplification unit and an optocoupler element. The PWM signal output by the power supply chip U3 is connected to the optocoupler element after being amplified by the amplification unit. The size of the optocoupler current output by the optocoupler element is controlled according to the duty cycle of the PWM signal. The feedback signal formed based on the optocoupler current is connected to the primary control module, which affects the output of the main control chip U2, and is used to adjust the switching frequency of the switch tube Q1, thereby adjusting the output current of the transformer T1.

[0041] Working principle: The power output adjustment circuit uses the primary control module to convert the input alternating current into direct current and connect it to the primary input terminal of the transformer T1. At the same time, the primary control module adjusts the duty cycle of the output signal according to the set parameters and the connected feedback signal to control the switching frequency of the switch tube Q1, thereby controlling the output current size of the transformer T1. Then, through the secondary output module, the alternating current output by the transformer T1 is converted into direct current and filtered, so that the transformer T1 can output stable direct current.

[0042] During the power output process, the temperature of the battery is monitored in real time by the temperature detection element NTC, and the current at the sampling resistor R30 is collected by the sampling feedback module. The temperature control module controls the output signal of the power supply chip U3 according to the monitored temperature signal and the collected current signal.

[0043] In one aspect, the power chip U3 adjusts the duty cycle of the output PWM signal, and adjusts the light coupling current of the light coupling element in the secondary feedback module by using the different duty cycles of the PWM signal, so that the main control chip U2 of the primary control module can adjust the output duty cycle in real time according to the feedback signal formed based on the light coupling current, and is used for adjusting the switching frequency of the switching tube Q1, thereby adjusting the output current of the transformer T1, and realizing the control of the output current of the transformer T1.

[0044] On the other hand, the power chip U3 adjusts the output switching signal to control the on-off of the switching tube Q3, the switching tube Q4 and the switching tube Q5. Normally, the temperature control module outputs the switching signal ON, so that the switching tube Q3, the switching tube Q4 and the switching tube Q5 are turned on, and the transformer T1 normally outputs; when the battery temperature exceeds the threshold value, the temperature control module outputs the switching signal OFF, so that the switching tube Q3, the switching tube Q4 and the switching tube Q5 are turned off, and the transformer T1 is closed to output.

[0045] When the battery heating occurs during the battery charging process, the output current can be adjusted in time to reduce the output current, and the output is turned off when the battery temperature is abnormal, so as to avoid the battery damage caused by overcurrent, overvoltage and other factors during the charging process.

[0046] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, and for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply output regulation circuit, characterized by, The temperature control module is used for detecting the temperature of the battery, and adjusting the output signal according to the detected temperature signal, wherein the output signal of the temperature control module comprises a PWM signal and a switching signal. The PWM signal is input into the secondary feedback module, and is used for adjusting the conduction degree of the optocoupler element in the secondary feedback module; the secondary feedback module outputs a feedback signal to the primary control module according to the conduction degree of the optocoupler element, and the feedback signal is used for adjusting the output signal of the primary control module to adjust the switching frequency of the switching tube Q1, so as to adjust the output current size of the transformer T1. The switching signal comprises a switching signal ON and a switching signal OFF, and the switching signal is input into the secondary output module, and is used for controlling the output or turn-off of the secondary output module. The sampling feedback module is connected with the secondary output module and the temperature control module, and is used for collecting a sampling current at a sampling resistor R30 in the secondary output module and generating an ADC1 signal transmitted to the temperature control module; and the temperature control module cooperatively controls the output signal of the temperature control module according to the detected temperature signal and the received ADC1 signal.

2. The power supply output adjustment circuit according to claim 1, characterized by, The primary input module comprises a fuse F1, a fuse F2, a capacitor CX1, a capacitor CX2, an inductor filter LF1, an inductor filter LF2 and a rectifier bridge DB1; the input alternating current is protected by the fuses F1 and F2, and then is subjected to grid interference and electromagnetic noise suppression by the capacitors CX1 and CX2 and the inductor filters LF1 and LF2, and then is converted into direct current by the rectifier bridge DB1.

3. The power supply output adjustment circuit according to claim 1, wherein The primary control module comprises a main control chip U2, a switching tube Q1, a diode D1 and a voltage stabilizing unit; the main control chip U2 is connected with the direct current voltage converted by the primary input module through the voltage stabilizing unit; the output signal of the main control chip U2 is connected with the switching tube Q1 through the diode D1, and is used for controlling the switching frequency of the switching tube Q1; and the switching tube Q1 is connected with the primary input end of the transformer T1.

4. The power supply output adjustment circuit according to claim 1, characterized by, The secondary output module comprises a Schottky diode D6, a capacitor C22, a capacitor C23 and a sampling resistor R30; the secondary output end of the transformer T1 outputs a high-frequency alternating current signal, which is rectified by the Schottky diode D6 to be converted into a direct current signal, and then is filtered by the capacitors C22 and C23 to remove the ripples in the direct current signal, so that the transformer T1 outputs a stable direct current voltage; and the sampling resistor R30 is used for monitoring the output current size of the transformer T1 in real time.

5. The power supply output adjustment circuit according to claim 1, wherein ​ 6. The power supply output adjustment circuit according to claim 1, wherein The secondary output module is configured with a switch tube Q3, a switch Q4 and a switch tube Q5, the switch tube Q5 is connected to the switch signal of the temperature control module, under normal circumstances, the temperature control module outputs the switch signal ON, so that the switch tube Q3, the switch tube Q4 and the switch tube Q5 are turned on, and the transformer T1 normally outputs; when the battery temperature exceeds the threshold value, the temperature control module outputs the switch signal OFF, so that the switch tube Q3, the switch tube Q4 and the switch tube Q5 are turned off, and the transformer T1 is closed to output.

7. The power supply output adjustment circuit according to claim 2, wherein The sampling feedback module comprises a resistor R32, a resistor R35, a resistor R29 and an amplifier U6A, the resistor R29 is connected to the positive input end of the amplifier U6A, the resistor R32 is connected to the negative input end of the amplifier U6A, the resistor R35 is connected between the negative input end and the output end of the amplifier U6A, and the output end of the amplifier U6A outputs an ADC1 signal and is connected to the power supply chip U3 of the temperature control module.

8. The power supply output adjustment circuit according to claim 2, wherein The temperature control module comprises a temperature detection element NTC and a power supply chip U3, the temperature detection element NTC is used for detecting the battery temperature in real time, and converts a temperature signal into a voltage signal and inputs the voltage signal into the power supply chip U3, the power supply chip U3 controls an output signal according to the voltage signal of the temperature detection element NTC and the ADC1 signal of the sampling feedback module, adjusts the output of the secondary feedback module through the output PWM signal, and controls the on-off of the secondary output module through the output switch signal.

9. The power supply output adjustment circuit according to claim 1, wherein The secondary feedback module comprises an amplification unit and an optocoupler element, the PWM signal output by the temperature control module is amplified by the amplification unit and then connected to the optocoupler element, the size of the optocoupler current output by the optocoupler element is controlled according to the duty ratio of the PWM signal, and the feedback signal formed on the basis of the optocoupler current is connected to the primary control module.

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