Power supply control circuit and charger

Abstract

The utility model relates to the technical field of power supplies, and mainly provides a power supply control circuit and a charger, the circuit comprises a switch module, a first detection module, a voltage-regulator tube and a first switch tube; the voltage-regulator tube is connected with the power supply and the first switch tube, the first detection module is respectively connected with the first switch tube, the switch module and the power supply, and the switch module is also connected with the power supply and the load. The first detection module is used for detecting the output voltage of the power supply when the turn-off signal is not received, and controlling the switch module to be closed when the output voltage is greater than a second preset value so as to supply power to the load; and when the voltage is greater than the first preset value, the voltage-regulator tube outputs a turn-off signal to the first detection module based on the first switching tube, so that the power supply stops supplying power to the load. Therefore, when the output voltage is larger than the second preset value and smaller than the first preset value, power can be supplied to the load, so that the load is controlled to work in a proper voltage range, and the condition of over-discharge of the power supply is avoided.

Description

Technical field

[0001] The utility model relates to the technical field of power supplies, and in particular to a power supply control circuit and a charger. [Background Technology]

[0002] As society continues to develop and progress, people's lifestyles are becoming increasingly diverse, and their enthusiasm for travel and outdoor activities continues to grow. In line with this trend, portable energy storage power supplies, which can conveniently power a variety of electronic devices, have experienced a booming market. However, with the increasing popularity of automobiles and people's pursuit of travel convenience, the demand for portable energy storage power supplies to quickly charge car batteries connected to vehicle engines has also increased.

[0003] However, because the on-road fast charger is powered solely by the car battery, the auxiliary power circuit that powers its control circuitry also draws power from the car battery. If this auxiliary power circuit remains operational for extended periods while the car is not running, it will drain the battery, potentially causing the battery to become depleted, affecting the vehicle's normal starting and operation.

[0004] Therefore, in order to make the auxiliary power circuit operate within a suitable voltage range, it is necessary to provide a power supply control circuit. [Utility Model Content]

[0005] The embodiments of the present utility model provide a power supply control circuit and a charger, aiming to solve the technical problem in the prior art that the power supply is prone to over-discharge, thereby reducing the service life of the power supply.

[0006] In order to solve the above technical problems, a technical solution adopted by the embodiment of the present utility model is: providing a power supply control circuit, the power supply control circuit including a switch module, a first detection module, a voltage regulator tube and a first switch tube;

[0007] The anode of the voltage regulator tube is connected to the power supply, the cathode of the voltage regulator tube is connected to the first switching tube, the first switching tube is also connected to the first detection module, the first detection module is also connected to the switch module and the power supply respectively, and the switch module is also connected to the power supply and the load respectively;

[0008] The voltage regulator tube is used to detect the output voltage of the power supply, and when the output voltage is greater than a first preset value, control the first switch tube to output a shutdown signal to the first detection module;

[0009] The first detection module is configured to detect the output voltage of the power supply when the shutdown signal is not received, and start operating when the output voltage is greater than a second preset value to control the switch module to close so that the power supply supplies power to the load through the switch module, wherein the second preset value is less than the first preset value; and

[0010] When the shutdown signal is received, the operation is stopped according to the shutdown signal to control the switch module to close, thereby stopping power supply to the load.

[0011] Optionally, the first detection module includes a first detection unit and a voltage regulator U1;

[0012] The first detection unit is connected to the power supply and the reference input terminal of the voltage regulator U1 respectively. The reference input terminal of the voltage regulator U1 is also connected to the first switch tube. The cathode of the voltage regulator U1 is connected to the switch module.

[0013] The first detection unit is used to detect the output voltage and output a first voltage to the voltage regulator U1 when the output voltage is greater than a second preset value;

[0014] The voltage regulator U1 is configured to start operating according to the first voltage to control the switch module to close when the shutdown signal is not received; and

[0015] After receiving the shutdown signal, the operation stops to control the switch module to be disconnected.

[0016] Optionally, the first detection unit is further configured to output a second voltage to the voltage regulator U1 when the output voltage is less than a second preset value, so as to stop the voltage regulator U1 from working.

[0017] Optionally, the first detection unit includes a resistor R3 and a resistor R4;

[0018] The resistor R4 is connected to the power supply, and is connected in series with the resistor R3. The resistor R4 is also connected to the reference input terminal of the voltage regulator U1, and the resistor R3 is also grounded.

[0019] Optionally, the switch module includes a switch tube Q2, a resistor R7 and a resistor R8;

[0020] The first end of the switch tube Q2 is connected to the power supply, the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R8, the control end of the switch tube Q2 is connected to the first detection module through the resistor R7, and the second end of the switch tube Q2 is connected to the load.

[0021] Optionally, the power supply control circuit further includes a second detection module;

[0022] The second detection module is connected to the power supply and the switch module respectively;

[0023] The second detection module is used to detect the output voltage of the power supply and start working when the output voltage is greater than a third preset value to control the switch module to close, wherein the third preset value is greater than the first preset value.

[0024] Optionally, the second detection module includes a second detection unit and a voltage regulator U2;

[0025] The second detection unit is connected to the power supply and the reference input terminal of the voltage regulator U2 respectively, and the cathode of the voltage regulator U2 is connected to the switch module;

[0026] The second detection unit is used to detect the output voltage and output a third voltage to the voltage regulator U2 when the output voltage is greater than a third preset value, so that the voltage regulator U2 starts to operate according to the third voltage, thereby controlling the switch module to close.

[0027] Optionally, the second detection unit is further configured to output a fourth voltage to the voltage regulator U2 when detecting that the output voltage is less than the third preset value, so as to control the voltage regulator U2 to stop working, thereby disconnecting the switch module.

[0028] Optionally, the power supply control circuit further includes a voltage adjustment module;

[0029] The voltage adjustment module is connected to the switch module and the load respectively;

[0030] The voltage adjustment module is used to receive the output voltage transmitted by the switch module and adjust the output voltage to output a preset voltage to the load.

[0031] In order to solve the above technical problems, another technical solution adopted by the embodiment of the present invention is: providing a charger, which includes the power supply control circuit as described above.

[0032] Different from the related art, the present invention provides a power supply control circuit and a charger, which includes a switch module, a first detection module, a voltage regulator tube and a first switch tube; the anode of the voltage regulator tube is connected to the power supply, the cathode of the voltage regulator tube is connected to the first switch tube, the first switch tube is also connected to the first detection module, the first detection module is also connected to the switch module and the power supply respectively, and the switch module is also connected to the power supply and the load respectively.

[0033] The first detection module is configured to detect the output voltage of the power supply when it has not received a shutdown signal. When the output voltage exceeds a second preset value, the switch module is controlled to close, allowing the power supply to charge the load. After the output voltage exceeds the first preset value, the voltage regulator diode outputs a shutdown signal to the first detection module based on the first switch diode, causing the first detection module to cease operation, thereby causing the power supply to stop supplying power to the load. This allows the load to be powered only when the output voltage is greater than the second preset value and less than the first preset value, thereby controlling the load to operate within an appropriate voltage range and preventing overdischarge of the power supply.

Brief Description of the Drawings

[0034] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0035] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model;

[0036] Figure 2 This is a structural block diagram of a power supply control circuit provided by an embodiment of the present utility model;

[0037] Figure 3 This is a circuit diagram of a power supply control circuit provided by an embodiment of the present utility model;

[0038] Figure 4 This is a circuit diagram of a power supply control circuit provided by another embodiment of the present utility model. [Specific implementation method]

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 intended to limit the present invention.

[0040] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0041] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0042] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein. Furthermore, the objects distinguished by "first," "second," and the like are generally of a class, and do not limit the number of objects. For example, the first object may be one or more.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the present invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0044] See also Figure 1 , Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model. Figure 1 As shown, application scenario 1 includes a power supply 100, a load 200, and a charger 300; the charger 300 is connected to the power supply 100 and the load 200, respectively. The power supply 100 is used to supply power to the load 200 through the charger 300, so that the load 200 operates normally. It should be noted that when the power supply 100 supplies power to the load 200 through the charger 300, the output voltage of the power supply 100 may not meet the power supply requirements of the load 200. At this time, if the power supply 100 continues to supply power to the load 200, it may cause the power supply 100 to be over-discharged, thereby damaging the power supply 100.

[0045] Therefore, in order to ensure that the power supply 100 can work normally, a power supply control circuit 30 is set in the charger 300, wherein Figure 1As shown, the power supply control circuit 30 is connected to the power supply 100 and the load 200, respectively. When the power supply 100 supplies power to the load 200 via the charger 300, the output voltage of the power supply 100 is input to the power supply control circuit 30. Upon receiving the output voltage, the power supply control circuit 30 detects the magnitude of the output voltage to determine whether it meets the power supply requirements of the load 200. If so, the output voltage is transmitted to the load 200 to provide power to the load 200. If the output voltage does not meet the power supply requirements, the output voltage of the power supply 100 is considered low. In this case, the power supply control circuit 30 stops transmitting the output voltage, disconnecting the power supply circuit of the power supply 100 and preventing over-discharge of the power supply 100. This improves the life of the power supply 100.

[0046] In some embodiments, the load 200 may be an electrical device. When the load 200 is an electrical device, the power supply 100 may be a power supply device such as a power grid or an energy storage power supply. If the output voltage of the power supply 100 does not meet the power supply requirements of the current electrical device (for example, the output voltage of the power supply 100 is 12V, while the power supply requirement of the electrical device is 24V), the power supply control circuit 30 will control the power supply 100 to stop supplying power to the load 200, thereby preventing the power supply 100 from over-discharging.

[0047] In another embodiment, the load 200 can also be a car auxiliary power source. When the load 200 is a car auxiliary power source, the power supply 100 can be a car battery. It is understood that the car battery is also connected to the car engine. When the car engine is started, the car engine charges the car battery to increase the battery level. However, when the car engine is not started, the car auxiliary power source will continue to consume the battery's power, causing the car battery to over-discharge. With the introduction of the power supply control circuit 30, when the car engine is not started, the car battery will power the car auxiliary power source through the power supply control circuit 30. When the output voltage of the car battery falls below the power supply requirement, the power supply control circuit 30 will stop transmitting the output voltage of the car battery, thereby stopping the car auxiliary power source from operating and preventing over-discharge of the car battery.

[0048] For further information, see Figure 2 , Figure 2 This is a structural block diagram of a power supply control circuit provided by an embodiment of the present utility model. Figure 2As shown, the power supply control circuit 30 includes a first detection module 31, a switch module 32, a voltage regulator tube D1 and a first switch tube Q1;

[0049] The anode of the voltage regulator tube D1 is connected to the power supply 100, and the cathode of the voltage regulator tube D1 is connected to the first switch tube Q1. The first switch tube Q1 is also connected to the first detection module 31. The first detection module 31 is also connected to the switch module 32 and the power supply 100 respectively. The switch module 32 is also connected to the power supply 100 and the load 200 respectively.

[0050] The voltage regulator D1 is used to detect the output voltage of the power supply 100 and control the first switch Q1 to output a shutdown signal to the first detection module 31 when the output voltage is greater than a first preset value;

[0051] The first detection module 31 is configured to detect the output voltage of the power supply 100 when the shutdown signal is not received, and start operating to control the switch module 32 to close when the output voltage is greater than a second preset value, so that the power supply 100 supplies power to the load 200 through the switch module 32, wherein the second preset value is less than the first preset value; and

[0052] When the shutdown signal is received, the operation is stopped according to the shutdown signal to control the switch module 32 to be closed, thereby stopping power supply to the load 200 .

[0053] Specifically, when the power supply 100 is connected to the load 200 via the charger 300, the Zener diode D1 receives the output voltage of the power supply 100 and determines whether the output voltage exceeds a first preset value (the regulated voltage value of the Zener diode D1). When the output voltage exceeds the first preset value, the Zener diode D1 breaks down, thereby controlling the first switch transistor Q1 to conduct, causing the first switch transistor Q1 to output a shutdown signal to the first detection module 31. Secondly, the first detection module 31 also receives the output voltage and, if it does not receive the shutdown signal, determines whether the output voltage is greater than a second preset value. If the output voltage is greater than the second preset value, the switch module 32 is controlled to close, thereby transmitting the output voltage to the load 200 through the switch module 32 to power the load 200. If the output voltage is less than the second preset value, the switch module 32 is controlled to close, thereby ceasing transmission of the output voltage. It should be noted that the first preset value and the second preset value are both set according to the operating voltage of the load 200 , and the voltage stabilization value of the voltage regulator diode D1 can be determined according to the first preset value.

[0054] When the first detection module 31 receives the shutdown signal, it stops operating based on the shutdown signal, thereby controlling the switch module 32 to shut down and stop transmitting the output voltage. Based on this, the first detection module 31 controls the switch module 32 to transmit the output voltage when the output voltage is greater than the second preset value and less than the first preset value, thereby preventing the power supply 100 from over-discharging and ensuring that the load 200 operates within an appropriate voltage range.

[0055] In some embodiments, as Figure 2 As shown, the first detection module 31 includes a first detection unit 311 and a voltage regulator U1;

[0056] The first detection unit 311 is connected to the power supply 100 and the reference input terminal of the voltage regulator U1 respectively. The reference input terminal of the voltage regulator U1 is also connected to the first switch tube Q1. The cathode of the voltage regulator U1 is connected to the switch module 32.

[0057] The first detection unit 311 is used to detect the output voltage and output a first voltage to the voltage regulator U1 when the output voltage is greater than a second preset value;

[0058] The voltage regulator U1 is configured to start operating according to the first voltage when not receiving the shutdown signal, so as to control the switch module 32 to be closed; and

[0059] After receiving the shutdown signal, the operation stops to control the switch module 32 to be disconnected.

[0060] In another embodiment, the first detection unit 311 is further configured to output a second voltage to the voltage regulator U1 when the output voltage is less than a second preset value, so as to stop the voltage regulator U1 from working.

[0061] Specifically, when the power supply 100 outputs a voltage, the first detection unit 311 detects the output voltage of the power supply 100, and when the output voltage is greater than a second preset value, outputs a first voltage to the voltage regulator U1; and when the output voltage is less than the second preset value, outputs a second voltage to the voltage regulator U1.

[0062] After receiving the first voltage, the voltage regulator U1 needs to determine whether it has received the shutdown signal. If the voltage regulator U1 does not receive the shutdown signal, it starts operating according to the first voltage and controls the switch module 32 to close. If the voltage regulator U1 receives the shutdown signal, it stops operating according to the shutdown signal, thereby controlling the switch module 32 to open. When the voltage regulator U1 receives the second voltage, it stops operating according to the second voltage, thereby opening the switch module 32.

[0063] In yet another embodiment, see Figure 3 , Figure 3 This is a circuit diagram of a power supply control circuit provided by an embodiment of the present utility model, such as Figure 3 As shown, the first detection unit 311 includes a resistor R3 and a resistor R4;

[0064] The resistor R4 is connected to the power supply 100 , and is connected in series with the resistor R3 . The resistor R4 is also connected to the reference input terminal of the voltage regulator U1 , and the resistor R3 is also grounded.

[0065] Specifically, the resistors R3 and R4 are used to divide the output voltage of the power supply 100 and input the divided voltage to the reference input of the voltage regulator U1. It should be noted that the operating state of the voltage regulator is determined based on the voltage input to the reference input. The voltage regulator only starts operating when the voltage input to the reference input of the voltage regulator is greater than the reference voltage of the voltage regulator. Therefore, when the output voltage is greater than the second preset value, the first voltage output after voltage division will be greater than the reference voltage of the voltage regulator U1, thereby causing the voltage regulator U1 to start operating; and when the output voltage is less than the second preset value, the second voltage is also lower than the reference voltage of the voltage regulator U1, thereby causing the voltage regulator U1 to stop operating.

[0066] It should be noted that, in some embodiments, there may be a load 200 that is compatible with two input voltages at the same time. For example, the load 200 can be charged by a 12V voltage and can also be charged by a 24V voltage. However, the current charger 300 only supports undervoltage protection in a single voltage segment. For example, for a charger adapted to 24V, when a 12V power supply is connected, the undervoltage protection is directly reported to stop the power supply 100 from supplying power to the load. For another example, for a charger adapted to 12V, when a 24V power supply 100 is connected, due to the low undervoltage protection setting for the 12V adaptation, during the process of the power supply 100 supplying power to the load 200, the voltage of the power supply 100 may be lower than the preset value. At this time, if the power supply 100 still supplies power to the load, it will cause the power supply 100 to be over-discharged, thereby causing damage to the power supply 100. Therefore, it is necessary to set up a charger 300 so that when the power supply 100 supplies power to the load 200, the power supply state of the power supply 100 can be accurately controlled based on the output voltage of the power supply 100, thereby protecting the power supply 100 while supplying power to the load 200 with different working voltages.

[0067] Based on this, in another embodiment, Figure 2 As shown, the power supply control circuit 30 further includes a second detection module 33, and the second detection module 33 is connected to the power supply 100 and the switch module 32 respectively;

[0068] The second detection module 33 is used to detect the output voltage of the power supply 100 and start working when the output voltage is greater than a third preset value to control the switch module 32 to close, wherein the third preset value is greater than the first preset value.

[0069] Among them, the output voltage of the power supply 100 is detected simultaneously by the second detection module 33 and the first detection module 31, and the working state of the switch module 32 is controlled according to the detection result, so as to control whether the power supply 100 supplies power to the load 200, thereby realizing precise control of the output voltage of the power supply 100.

[0070] Specifically, when the power supply 100 supplies power to the load 200, if the output voltage is less than a second preset value, the first detection module 31 and the second detection module 33 both stop working, thereby stopping transmitting the output voltage to the load 200; and when the output voltage is greater than the second preset value and less than the first preset value, the first detection module 31 starts working, thereby controlling the switch module 32 to transmit the output voltage to the load 200; when the output voltage is greater than the first preset value and less than a third preset value, the first detection module 31 exits working based on the Zener diode D1, and the second detection module 33 is also in a stopped working state. At this time, the power supply 100 stops supplying power to the load 200 again; when the output voltage is greater than the third preset value, the second detection module 33 starts working, thereby controlling the switch module 32 to close, so that the power supply 100 supplies power to the load through the switch module 32 again. Based on this, it is possible to meet power supply requirements of different power consumption through the first detection module 31 and the second detection module 33, so that while protecting the power supply 100, the power supply 100 can be compatible with different power supply requirements, thereby improving the reliability of the power supply 100.

[0071] In some embodiments, as Figure 2 As shown, the second detection module 33 includes a second detection unit 331 and a voltage stabilizer U2;

[0072] The second detection unit 331 is connected to the power supply 100 and the reference input terminal of the voltage regulator U2 respectively, and the cathode of the voltage regulator U2 is connected to the switch module 32;

[0073] The second detection unit 331 is used to detect the output voltage and output a third voltage to the voltage regulator U2 when the output voltage is greater than a third preset value, so that the voltage regulator U2 starts to operate according to the third voltage, thereby controlling the switch module 32 to be closed.

[0074] In another embodiment, the second detection unit 331 is further configured to output a fourth voltage to the voltage regulator U2 when detecting that the output voltage is less than the third preset value, so as to control the voltage regulator U2 to stop working, thereby disconnecting the switch module 32.

[0075] Specifically, when the power supply 100 supplies power to the load 200, the second detection unit 331 detects whether the output voltage is greater than a third preset value. If so, the second detection unit 331 outputs a third voltage to the voltage regulator U2 to control the voltage regulator U2 to start working, thereby causing the switch module 32 to start transmitting the output voltage to the load 200. If the output voltage is less than the third preset value, the second detection unit 331 outputs a fourth voltage to the voltage regulator U2 to control the voltage regulator U2 to stop working, thereby controlling the switch module 32 to stop working.

[0076] In yet another embodiment, Figure 3 As shown, the second detection unit 331 includes a resistor R6 and a resistor R5;

[0077] The resistor R6 is connected to the power supply 100 , and is connected in series with the resistor R5 . The resistor R6 is also connected to the reference input terminal of the voltage regulator U2 , and the resistor R5 is also grounded.

[0078] Specifically, the resistors R5 and R6 are used to divide the output voltage and output the divided voltage to the reference input terminal of the voltage regulator U2. It can be seen that when the output voltage is greater than the third preset value, the divided third voltage is greater than the reference voltage of the voltage regulator U2, so the voltage regulator U2 can be turned on based on the third voltage. Conversely, if the divided fourth voltage is less than the reference voltage of the voltage regulator U2, the voltage regulator U2 will not operate.

[0079] It should be noted that, in some embodiments, the reference voltage of the voltage regulator U1 and the reference voltage of the voltage regulator U2 can be set to the same voltage, but when setting the circuit, by setting the voltage divider resistors of the voltage regulator U1 and the voltage regulator U2 to different resistance values, the voltage regulator U1 starts working when the output voltage is greater than the second preset value, and the voltage regulator U2 starts working when the output voltage is greater than the third preset value.

[0080] In another embodiment, the reference voltage of the voltage regulator U2 can be set to be greater than the reference voltage of the voltage regulator U1, so that the voltage regulator U2 operates when the output voltage is greater than a third preset value, while the voltage regulator U1 starts operating when the output voltage is greater than a second preset value. Based on this, different voltage regulators can be turned on at different output voltages, thereby protecting the power supply 100 while allowing the load to operate within an appropriate voltage range.

[0081] In yet another embodiment, Figure 3 As shown, the switch module 32 includes a switch tube Q2, a resistor R7 and a resistor R8;

[0082] The first end of the switch tube Q2 is connected to the power supply 100, and the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R8. The control end of the switch tube Q2 is connected to the first detection module 31 through the resistor R7. The second end of the switch tube Q2 is connected to the load 200 (A1).

[0083] Specifically, when the voltage regulator U1 or the voltage regulator U2 starts working, the switch tube Q2 is in the on state, and the output voltage is transmitted to the load 200 through the switch tube Q2 to power the load 200. When both the voltage regulator U1 and the voltage regulator U2 stop working, the switch tube Q2 is in the off state, thereby stopping the transmission of the output voltage.

[0084] In some embodiments, as Figure 2 As shown, the power supply control circuit 30 further includes a voltage adjustment module 34;

[0085] The voltage adjustment module 34 is connected to the switch module 32 and the load 200 respectively;

[0086] The voltage adjustment module 34 is configured to receive the output voltage transmitted by the switch module 32 and adjust the output voltage to output a preset voltage to the load 200 .

[0087] In yet another embodiment, see Figure 4 , Figure 4 FIG. 1 is a circuit diagram of a power supply control circuit provided by another embodiment of the present invention, such as Figure 4 As shown, the voltage adjustment module 34 includes a voltage conversion chip U1, an inductor LD1, a resistor R9 and a resistor R10;

[0088] The input pin of the voltage conversion chip U1 is connected to the switch module 32, the output pin of the voltage conversion chip U1 is connected to the inductor LD1, the inductor LD1 is also connected to the resistor R9, the resistor R9 is connected in series with the resistor R10, the resistor R9 is also connected to the feedback pin of the voltage conversion chip U1, and the inductor LD1 is also used to connect the load 200.

[0089] Specifically, when the switch tube Q2 is turned on, the output voltage of the power supply 100 will be input into the voltage conversion chip U1 through the switch tube Q2. When the conversion chip U1 receives the output voltage, it will cooperate with the inductor LD1 to process the output voltage, thereby outputting a preset voltage to the load 200.

[0090] In some embodiments, combined Figure 3 and Figure 4It can be seen that when the power supply 100 supplies power to the load 200, the output voltage is simultaneously input to the voltage regulator D1, resistor R4, and resistor R6. When the output voltage is less than a second preset value, the voltage regulator D1, voltage regulator U1, and voltage regulator U2 all stop operating, and the switch Q2 also stops operating. At this time, the power supply 100 stops supplying power to the load 200. When the output voltage exceeds the second preset value, the output voltage is divided by resistors R4 and R3 and input to the voltage regulator U1. At this time, because the divided voltage is greater than the reference voltage of voltage regulator U1, voltage regulator U1 begins to operate, turning on switch Q2, and the output voltage is output to the voltage conversion chip U1 through switch Q2. After receiving the output voltage, the voltage conversion chip U1 adjusts the output voltage based on inductor LD1, thereby outputting the preset voltage to the load 200.

[0091] When the output voltage exceeds a first preset value, the voltage regulator D1 breaks down, and the first switch Q1 turns on. When the first switch Q1 turns on, the voltage at the reference input of the voltage regulator U1 is pulled down, causing the voltage regulator U1 to stop operating. The switch Q2 is also turned off, stopping power supply to the load 200. When the output voltage exceeds a third preset value, the output voltage after voltage division by resistors R6 and R5 is greater than the reference voltage of the voltage regulator U2. Therefore, the voltage regulator U2 begins operating, and the switch Q2 turns on again, allowing the power supply 100 to once again supply power to the load 200. This prevents overdischarge of the power supply 100 while enabling loads 200 with varying power requirements to operate normally.

[0092] An embodiment of the present invention provides a power supply control circuit, which includes a switch module, a first detection module, a voltage regulator tube, and a first switch tube; the anode of the voltage regulator tube is connected to the power supply, the cathode of the voltage regulator tube is connected to the first switch tube, the first switch tube is also connected to the first detection module, the first detection module is also connected to the switch module and the power supply, and the switch module is also connected to the power supply and a load. The first detection module is used to detect the output voltage of the power supply when no shutdown signal is received, so as to control the switch module to close when the output voltage is greater than a second preset value, so that the power supply charges the load; and after the output voltage is greater than the first preset value, the voltage regulator tube outputs a shutdown signal to the first detection module based on the first switch tube, causing the first detection module to stop working, thereby causing the power supply to stop supplying power to the load. Based on this, the load can be powered when the output voltage is greater than the second preset value and less than the first preset value, thereby controlling the load to operate within an appropriate voltage range, thereby avoiding over-discharge of the power supply.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply control circuit, characterized in that: The power supply control circuit includes a switch module, a first detection module, a voltage regulator tube and a first switch tube; The anode of the voltage regulator tube is connected to the power supply, the cathode of the voltage regulator tube is connected to the first switching tube, the first switching tube is also connected to the first detection module, the first detection module is also connected to the switch module and the power supply respectively, and the switch module is also connected to the power supply and the load respectively; The voltage regulator tube is used to detect the output voltage of the power supply, and when the output voltage is greater than a first preset value, control the first switch tube to output a shutdown signal to the first detection module; The first detection module is configured to detect the output voltage of the power supply when the shutdown signal is not received, and start operating when the output voltage is greater than a second preset value to control the switch module to close so that the power supply supplies power to the load through the switch module, wherein the second preset value is less than the first preset value; as well as When the shutdown signal is received, the operation is stopped according to the shutdown signal to control the switch module to close, thereby stopping power supply to the load.

2. The power supply control circuit according to claim 1, characterized in that: The first detection module includes a first detection unit and a voltage stabilizer U1; The first detection unit is connected to the power supply and the reference input terminal of the voltage regulator U1 respectively. The reference input terminal of the voltage regulator U1 is also connected to the first switch tube. The cathode of the voltage regulator U1 is connected to the switch module. The first detection unit is used to detect the output voltage and output a first voltage to the voltage regulator U1 when the output voltage is greater than a second preset value; The voltage regulator U1 is configured to start operating according to the first voltage to control the switch module to close when the shutdown signal is not received; as well as After receiving the shutdown signal, the operation stops to control the switch module to be disconnected.

3. The power supply control circuit according to claim 2, characterized in that: The first detection unit is further configured to output a second voltage to the voltage regulator U1 when the output voltage is less than a second preset value, so as to stop the voltage regulator U1 from working.

4. The power supply control circuit according to claim 3, characterized in that: The first detection unit includes a resistor R3 and a resistor R4; The resistor R4 is connected to the power supply, and is connected in series with the resistor R3. The resistor R4 is also connected to the reference input terminal of the voltage regulator U1, and the resistor R3 is also grounded.

5. The power supply control circuit according to claim 1, wherein: The switch module includes a switch tube Q2, a resistor R7 and a resistor R8; The first end of the switch tube Q2 is connected to the power supply, the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R8, the control end of the switch tube Q2 is connected to the first detection module through the resistor R7, and the second end of the switch tube Q2 is connected to the load.

6. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The power supply control circuit further includes a second detection module; The second detection module is connected to the power supply and the switch module respectively; The second detection module is used to detect the output voltage of the power supply and start working when the output voltage is greater than a third preset value to control the switch module to close, wherein the third preset value is greater than the first preset value.

7. The power supply control circuit according to claim 6, characterized in that: The second detection module includes a second detection unit and a voltage stabilizer U2; The second detection unit is connected to the power supply and the reference input terminal of the voltage regulator U2 respectively, and the cathode of the voltage regulator U2 is connected to the switch module; The second detection unit is used to detect the output voltage and output a third voltage to the voltage regulator U2 when the output voltage is greater than a third preset value, so that the voltage regulator U2 starts to operate according to the third voltage, thereby controlling the switch module to close.

8. The power supply control circuit according to claim 7, characterized in that: The second detection unit is further configured to output a fourth voltage to the voltage regulator U2 when detecting that the output voltage is less than the third preset value, so as to control the voltage regulator U2 to stop working, thereby disconnecting the switch module.

9. The power supply control circuit according to claim 6, characterized in that: The power supply control circuit also includes a voltage adjustment module; The voltage adjustment module is connected to the switch module and the load respectively; The voltage adjustment module is used to receive the output voltage transmitted by the switch module and adjust the output voltage to output a preset voltage to the load.

10. A charger, characterized in that: The charger includes the power supply control circuit according to any one of claims 1 to 9.

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