Voltage segment identification circuit and charger

Abstract

The invention relates to the technical field of power supplies, and mainly provides a voltage segment identification circuit and a charger, the circuit comprises a voltage detection module, a switch module and a voltage adjustment module; the voltage detection module is connected with the power supply and the switch module, the switch module is connected with the power supply and the voltage regulation module, and the voltage regulation module is connected with the load; the voltage detection module is used for detecting the output voltage of the power supply and controlling the switch module to be closed when the output voltage is in a second voltage range or a fourth voltage range so as to transmit the output voltage to the voltage adjustment module; and when the output voltage is in the first voltage range or the third voltage range, the switch module is controlled to be switched off to stop transmitting the output voltage, so that different battery discharge requirements can be met, and the over-discharge condition of the power supply can be avoided. And the voltage adjusting module is used for adjusting the output voltage to output the preset voltage to the load, so that the load is ensured to work under the stable voltage, and the reliability of the circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a voltage segment identification circuit and a charger. Background Art

[0002] In the field of modern transportation, electric vehicles and hybrid vehicles are developing rapidly, and on-vehicle fast charging technology has become the key to ensuring vehicle endurance and efficient operation. In the on-vehicle fast charging system, there are two different voltage ranges: 14.4V and 28.8V.

[0003] With the increase of electronic devices in vehicles and the growing demand for power, the discharge of batteries has become more complicated. In actual use, when the battery is in a low voltage state, if the load continues to discharge, the voltage will be pulled very low. This situation is very likely to damage the power supply, affecting the service life and performance of the power supply. Moreover, it is important to note that these two different voltage segments are not compatible with the same charger. This means that during the charging process, the corresponding charger must be strictly matched, otherwise it may cause abnormal charging or even damage the power supply and charging equipment.

[0004] Therefore, in order to ensure that the power supply can be discharged normally during use, it is necessary to provide a voltage segment identification circuit. Summary of the invention

[0005] The embodiments of the present invention provide a voltage segment identification circuit and a charger, aiming to solve the technical problems in the prior art that a power supply is easily over-discharged and has a short service life.

[0006] In order to solve the above technical problems, a technical solution adopted by the embodiment of the present invention is: providing a voltage segment identification circuit, the voltage segment identification circuit comprising a voltage detection module, a switch module and a voltage adjustment module;

[0007] The voltage detection module is connected to the power supply and the switch module respectively, the switch module is connected to the power supply and the voltage adjustment module respectively, and the voltage adjustment module is used to connect the load;

[0008] The voltage detection module is used to detect the output voltage of the power supply, and when the output voltage is within the second voltage range or the fourth voltage range, control the switch module to close, so that the switch module transmits the output voltage to the voltage adjustment module; and

[0009] When the output voltage is within the first voltage range or the third voltage range, controlling the switch module to disconnect so that the switch module stops transmitting the output voltage of the power supply, wherein the second voltage range is greater than the first voltage range and less than the third voltage range, and the third voltage range is less than the fourth voltage range;

[0010] The voltage adjustment module is used for receiving the output voltage transmitted by the switch module and adjusting the output voltage to output a preset voltage to the load.

[0011] Optionally, the voltage detection module includes a first detection unit, a second detection unit and a third detection unit;

[0012] The first detection unit is connected to the power supply and the second detection unit respectively, the second detection unit is connected to the power supply and the switch module respectively, and the third detection unit is connected to the power supply and the switch module respectively;

[0013] The first detection unit is configured to output a first control signal to the second detection unit when detecting that the output voltage of the power supply is within a first voltage range and a second voltage range; and

[0014] When the output voltage of the power supply is within a third voltage range and a fourth voltage range, outputting a second control signal to the second detection unit;

[0015] The second detection unit is used to obtain the output voltage of the power supply when receiving the first control signal, and detect whether the output voltage is within a first voltage range or a second voltage range, and if the output voltage is within the first voltage range, control the switch module to be disconnected, and if the output voltage is within the second voltage range, control the switch module to be closed; and

[0016] upon receiving the second control signal, stopping operation according to the second control signal;

[0017] The third detection unit is used to detect the output voltage of the power supply to determine whether the output voltage is within a fourth voltage range, and start working when the output voltage is within the fourth voltage range to control the switch module to close.

[0018] Optionally, the first detection unit includes a voltage regulator tube DZ1, a resistor R11, a resistor R16 and a switch tube Q3;

[0019] The cathode of the voltage regulator tube DZ1 is connected to the power supply, the anode of the voltage regulator tube DZ1 is connected to the control end of the switch tube Q3 through the resistor R11, the control end of the switch tube Q3 is also grounded through the resistor R16, the first end of the switch tube Q3 is connected to the second detection unit, and the second end of the switch tube Q3 is used for grounding.

[0020] Optionally, the second detection unit includes a resistor R6, a resistor R17, a capacitor C10 and a voltage regulator U3;

[0021] The reference input terminal of the voltage regulator U3 is connected to the power supply through the resistor R6, and the reference input terminal of the voltage regulator U3 is also grounded through the resistor R17. The reference input terminal of the voltage regulator U3 is also connected to the first detection unit, the capacitor C10 is connected in parallel with the resistor R17, the cathode of the voltage regulator U3 is connected to the switch module, and the anode of the voltage regulator U3 is used for grounding.

[0022] Optionally, the third detection unit includes a voltage stabilizer U2, a resistor R7, a resistor R15 and a capacitor C11;

[0023] The reference input terminal of the voltage regulator U2 is connected to the power supply through the resistor R7, and the reference input terminal of the voltage regulator U2 is also grounded through the resistor R15. The capacitor C11 is connected in parallel with the resistor R15. The cathode of the voltage regulator U2 is connected to the switch module, and the anode of the voltage regulator U2 is used for grounding.

[0024] Optionally, the switch module includes a switch tube Q1, a resistor R2 and a resistor R4;

[0025] The first end of the switch tube Q1 is connected to the power supply, the first end of the switch tube Q1 is also connected to the control end of the switch tube Q1 through the resistor R2, the control end of the switch tube Q1 is connected to the voltage detection module through the resistor R4, and the second end of the switch tube Q1 is connected to the voltage adjustment module.

[0026] Optionally, the voltage segment identification circuit further includes a control module;

[0027] The control module is connected to the switch module;

[0028] The control module is used to receive a driving signal and control the switch module to close or open based on the driving signal.

[0029] Optionally, the control module includes a switch tube Q2, a resistor R13 and a resistor R14;

[0030] The control end of the switch tube Q2 is connected to the controller through the resistor R13, and the control end of the switch tube Q2 is also grounded through the resistor R14. The first end of the switch tube Q2 is connected to the switch module, and the second end of the switch tube Q2 is used for grounding.

[0031] Optionally, the voltage adjustment module includes a voltage conversion chip U1, an inductor LD1, a resistor R3 and a resistor R8;

[0032] The input pin of the voltage conversion chip U1 is connected to the switch module, the output pin of the voltage conversion chip U1 is connected to the inductor LD1, the inductor LD1 is also connected to the resistor R3, the resistor R3 is connected in series with the resistor R8, the resistor R3 is also connected to the feedback pin of the voltage conversion chip U1, and the inductor LD1 is also used to connect a load.

[0033] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: providing a charger, the charger comprising:

[0034] Voltage segment identification circuit as described above.

[0035] Different from the related art, the present invention provides a voltage segment identification circuit and a charger, the circuit includes a voltage detection module, a switch module and a voltage adjustment module; the voltage detection module is connected to the power supply and the switch module respectively, the switch module is connected to the power supply and the voltage adjustment module respectively, and the voltage adjustment module is used to connect the load; the voltage detection module is used to detect the output voltage of the power supply, and when the output voltage is within the second voltage range or the fourth voltage range, control the switch module to close so that the switch module transmits the output voltage to the voltage adjustment module; and when the output voltage is within the first voltage range or the third voltage range, control the switch module to disconnect so that the switch module stops transmitting the output voltage of the power supply, so that it can not only be compatible with different battery discharge requirements, but also avoid over-discharge when the power supply is insufficient, thereby extending the service life of the power supply. The voltage adjustment module is used to receive the output voltage of the power supply and adjust the output voltage to output a preset voltage to the load, thereby ensuring that the load works under a stable voltage and improving the reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0037] Figure 1 is a schematic diagram of an application scenario provided by an embodiment of the present invention;

[0038] Figure 2 is a structural block diagram of a voltage segment identification circuit provided by an embodiment of the present invention;

[0039] Figure 3 is a circuit diagram of a voltage segment identification circuit provided by an embodiment of the present invention;

[0040] Figure 4 is a circuit diagram of a voltage segment identification circuit provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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.

[0042] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the protection scope of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device schematic diagram or the order in the flow chart.

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

[0044] See also Figure 1 , Figure 1 is a schematic diagram of an application scenario provided by an embodiment of the present invention, such as Figure 1 As shown, the application scenario 1 includes a power supply 100, a charger 300 and a load 200, wherein the power supply 100 is used to connect to the load 200 through the charger 300. After the power supply 100 is connected to the load 200, the power supply 100 starts to supply power to the load 200 through the charger 300, so that the load 200 can operate normally.

[0045] Among them, Figure 1As shown, some loads can be compatible with 12V and 24V input voltages for power supply, that is, the connected power supply 100 can be 12V input voltage or 24V input voltage, and the current charger only supports undervoltage protection of 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 200; for another example, for a charger adapted to 12V, when a 24V power supply is connected, due to the low setting of the undervoltage protection adapted to 12V, 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. It should be noted that the power supply can be a battery.

[0046] Therefore, in order to ensure that different types of power supplies 100 can work normally, when the power supply 100 supplies power to the load 200 through the charger 300, a voltage segment identification circuit 30 is set in the charger 300, wherein, Figure 1 As shown, the voltage segment identification circuit 30 is connected to the power supply 100 and the load 200 respectively. When the power supply 100 starts to supply power to the load 200, the output voltage of the power supply 100 will be input to the voltage segment identification circuit 30. When the voltage segment identification circuit 30 receives the output voltage, the voltage segment identification circuit 30 will detect the magnitude of the output voltage in real time, and when the output voltage meets the preset conditions, the output voltage will be transmitted to the load 200 to supply power to the load 200. If the output voltage does not meet the preset conditions, it is considered that the output voltage of the power supply 100 does not match the load 200. At this time, the voltage segment identification circuit 30 will cut off the power supply circuit of the power supply 100 to avoid over-discharge. Based on this, the life of the power supply 100 can be improved.

[0047] In some embodiments, Figure 1 As shown, the charger 300 further includes a controller 40, and the controller 40 is respectively connected to the power supply 100 and the voltage segment identification circuit 30. When the power supply 100 is connected to the load 200 through the voltage segment identification circuit 30, the controller 40 is also used to monitor the output voltage of the power supply 100 in real time, and when the output voltage output fluctuates, output a driving signal to the voltage segment identification circuit 30, so as to control the voltage segment identification circuit 30 to start transmitting the output voltage / stop transmitting the output voltage of the power supply 100 according to the driving signal.

[0048] In some embodiments, see Figure 2 , Figure 2 is a structural block diagram of a voltage segment identification circuit provided by an embodiment of the present invention, such as Figure 2 As shown, the voltage segment identification circuit 30 includes a voltage detection module 31, a switch module 32 and a voltage adjustment module 33;

[0049] The voltage detection module 31 is connected to the power supply 100 and the switch module 32 respectively, the switch module 32 is connected to the power supply 100 and the voltage adjustment module 33 respectively, and the voltage adjustment module 33 is used to connect the load 200;

[0050] The voltage detection module 31 is used to detect the output voltage of the power supply 100, and when the output voltage is within the second voltage range or the fourth voltage range, control the switch module 32 to close, so that the switch module 32 transmits the output voltage to the voltage adjustment module 33; and

[0051] When the output voltage is within the first voltage range or the third voltage range, the switch module 32 is controlled to be disconnected so that the switch module 32 stops transmitting the output voltage of the power supply 100, wherein the second voltage range is greater than the first voltage range and less than the third voltage range, and the third voltage range is less than the fourth voltage range;

[0052] The voltage adjustment module 33 is used for receiving the output voltage transmitted by the switch module 32 and adjusting the output voltage to output a preset voltage to the load 200 .

[0053] Specifically, when the power supply 100 is connected to the load 200 through the charger 300, the voltage detection module 31 detects the output voltage of the power supply 100 in real time and determines the voltage range of the output voltage. If the output voltage is within the first voltage range or the third voltage range, it means that the output voltage of the power supply 100 does not meet the preset condition. At this time, the switch module 32 is in the disconnected state, thereby prohibiting the output voltage of the power supply 100 from being output to the load 200, thereby protecting the power supply 100 and prolonging the life of the power supply 100.

[0054] If the output voltage is within the second voltage range or the fourth voltage range, it means that the output voltage of the power supply 100 meets the power demand of the load 200. At this time, the voltage detection module 31 controls the switch module 32 to be closed, so that the output voltage of the power supply 100 is output to the voltage adjustment module 33 through the switch module 32. When the voltage adjustment module 33 receives the output voltage, it adjusts the output voltage, thereby outputting a preset voltage to the load 200 to supply power to the load 200. It should be noted that when the output voltage of the power supply 100 is within the second voltage range and the fourth voltage range, it is considered that the power supply 100 meets the power supply demand of the load 200, and at this time, the power supply 100 can charge the load 200 normally. Based on this, the corresponding working voltage can be provided to the load 200 while protecting the power supply 100.

[0055] In some embodiments, Figure 2 As shown, the voltage detection module 31 includes a first detection unit 311, a second detection unit 312 and a third detection unit 313;

[0056] The first detection unit 311 is connected to the power supply 100 and the second detection unit 312 respectively, the second detection unit 312 is connected to the power supply 100 and the switch module 32 respectively, and the third detection unit 313 is connected to the power supply 100 and the switch module 32 respectively;

[0057] The first detection unit 311 is used to output a first control signal to the second detection unit 312 when detecting that the output voltage of the power supply 100 is within the first voltage range and the second voltage range; and

[0058] When the output voltage of the power supply 100 is within the third voltage range and the fourth voltage range, outputting a second control signal to the second detection unit 312;

[0059] The second detection unit 312 is used to obtain the output voltage of the power supply 100 when receiving the first control signal, and detect whether the output voltage is within the first voltage range or the second voltage range, if the output voltage is within the first voltage range, control the switch module 32 to be disconnected, if the output voltage is within the second voltage range, control the switch module 32 to be closed; and

[0060] upon receiving the second control signal, stopping operation according to the second control signal;

[0061] The third detection unit 313 is used to detect the output voltage of the power supply 100 to determine whether the output voltage is within a fourth voltage range, and start working when the output voltage is within the fourth voltage range to control the switch module 32 to close.

[0062] Specifically, when the power supply 100 is connected to the load 200, the power supply 100 will output a voltage. At this time, the output voltage will be output to the first detection unit 311, the second detection unit 312 and the third detection unit 313 respectively; and when the first detection unit 311 receives the output voltage, it will determine the voltage range of the output voltage. If the output voltage is within the first voltage range and the second voltage range, the first control signal is output to the second detection unit 312, so that the second detection unit 312 determines the voltage range of the output voltage according to the first control signal. If the second detection unit 312 detects that the output voltage is within the first voltage range, the switch module 32 is controlled to be disconnected to avoid over-discharge of the power supply 100; if the second detection unit 312 detects that the output voltage is within the second voltage range, the switch module 32 is controlled to be closed so that the power supply 100 supplies power to the load 200.

[0063] If the first detection unit 311 detects that the output voltage of the power supply 100 is within the third voltage range and the fourth voltage range, the second detection unit 311 outputs a second control signal to the second detection unit 312. At this time, the second detection unit 312 stops working according to the second control signal, so that the switch module 32 is disconnected, and the power supply 100 stops supplying power to the load 200.

[0064] Further, after receiving the output voltage, the third detection unit 313 detects the output voltage of the power supply 100 in real time, and starts working when the output voltage is within the fourth voltage range to control the switch module 32 to close, so that the power supply 10 again supplies power to the load 200. Based on this, when the power supply 100 is connected to the load 200, the output detection of different types of power supplies 100 can be performed through the first detection unit 311, the second detection unit 312 and the third detection unit 313, so as to avoid over-discharge, thereby improving the life of the power supply 100.

[0065] In yet another embodiment, see Figure 3 , Figure 3 is a circuit diagram of a voltage segment identification circuit provided by an embodiment of the present invention, such as Figure 3As shown, the first detection unit 311 includes a voltage regulator tube DZ1, a resistor R11, a resistor R16, a capacitor C9 and a switch tube Q3;

[0066] The cathode of the voltage regulator tube DZ1 is connected to the power supply 100, the anode of the voltage regulator tube DZ1 is connected to the control end of the switch tube Q3 through the resistor R11, the control end of the switch tube Q3 is also grounded through the resistor R16, the capacitor C9 is connected in parallel with the resistor R16, the first end of the switch tube Q3 is connected to the second detection unit 312, and the second end of the switch tube Q3 is used for grounding.

[0067] Specifically, when the power supply 100 outputs a voltage, the voltage regulator ZD1 receives the output voltage. If the output voltage is within the first voltage range or the second voltage range, the voltage regulator ZD1 is in a cut-off state; and when the output voltage is within the third voltage range or the fourth voltage range, the voltage regulator ZD1 is broken down. When the voltage regulator ZD1 is broken down, the switch tube Q3 is also turned on, thereby outputting a low-level signal to the reference input terminal of the voltage regulator U3.

[0068] Further, such as Figure 3 As shown, the second detection unit 312 includes a resistor R6, a resistor R17, a capacitor C10 and a voltage regulator U3;

[0069] The reference input terminal of the voltage regulator U3 is connected to the power supply 100 through the resistor R6, and the reference input terminal of the voltage regulator U3 is also grounded through the resistor R17. The reference input terminal of the voltage regulator U3 is also connected to the first detection unit 311, the capacitor C10 is connected in parallel with the resistor R17, the cathode of the voltage regulator U3 is connected to the switch module 32, and the anode of the voltage regulator U3 is used for grounding.

[0070] It can be known that the working state of the voltage stabilizer is determined based on the voltage input to the reference input terminal. When the voltage input to the reference input terminal of the voltage stabilizer is greater than the reference voltage of the voltage stabilizer, the voltage stabilizer starts to work. Therefore, when the power supply 100 outputs a voltage, the resistor R6 and the resistor R17 divide the output voltage and input the divided voltage to the reference input terminal of the voltage stabilizer U3. When the output voltage is within the first voltage range, the divided voltage is less than the reference voltage of the voltage stabilizer U3, so the voltage stabilizer U3 does not work; when the output voltage is within the second voltage range, the divided voltage is greater than the reference voltage of the voltage stabilizer U3, and the voltage stabilizer U3 starts to work, thereby controlling the switch module 32 to close, and then transmitting the output voltage of the power supply 100.

[0071] It should be noted that, when the output voltage is in the third voltage range or the fourth voltage range, although the voltage after the voltage division of the resistor R6 and the resistor R17 is greater than the reference voltage of the voltage regulator U3, since the reference input terminal of the voltage regulator U3 is also connected to the switch tube Q3, when the output voltage is in the third voltage range or the fourth voltage range, the voltage at the reference input terminal of the voltage regulator U3 is pulled down by the switch tube Q3, so that the voltage regulator U3 stops working, and then the switch module 32 is turned off.

[0072] In yet another embodiment, Figure 3 As shown, the third detection unit 313 includes a voltage stabilizer U2, a resistor R7, a resistor R15 and a capacitor C11;

[0073] The reference input terminal of the voltage regulator U2 is connected to the power supply 100 through the resistor R7, and the reference input terminal of the voltage regulator U2 is also grounded through the resistor R15. The capacitor C11 is connected in parallel with the resistor R15. The cathode of the voltage regulator U2 is connected to the switch module 32, and the anode of the voltage regulator U2 is used for grounding.

[0074] Specifically, when the power supply 100 outputs a voltage, the resistor R7 and the resistor R15 divide the output voltage and input the divided voltage to the reference input terminal of the voltage regulator U2. However, when the output voltage is within the first voltage range, the second voltage range, and the third voltage range, the divided voltage is lower than the reference voltage of the voltage regulator U2, so the voltage regulator U2 does not work. When the output voltage is within the fourth voltage range, the divided voltage is greater than the reference voltage of the voltage regulator U2, and the voltage regulator U2 starts to work, thereby controlling the switch module 32 to close, and then transmitting the output voltage of the power supply 100. It should be noted that the reference voltage of the voltage regulator U2 can be set to the same voltage value as the reference voltage of the voltage regulator U3, but when setting the circuit, the voltage divider resistors of the voltage regulator U2 and the voltage regulator U3 need to be set to different resistance values, so that when the output voltage is in the second voltage range, the voltage regulator U3 starts working, and when the output voltage is in the fourth voltage range, the voltage regulator U2 starts working.

[0075] In another embodiment, the reference voltage of the voltage regulator U2 can also be set to be greater than the reference voltage of the voltage regulator U3, so that the voltage regulator U2 works when the output voltage is in the fourth voltage range, and the voltage regulator U3 starts working when the output voltage is in the second voltage range. Based on this, different voltage regulators can be turned on at different output voltages, thereby realizing voltage segment identification of the output voltage.

[0076] In yet another embodiment, Figure 3As shown, the switch module 32 includes a switch tube Q1, a resistor R2 and a resistor R4;

[0077] The first end of the switch tube Q1 is connected to the power supply 100, and the first end of the switch tube Q1 is also connected to the control end of the switch tube Q1 through the resistor R2. The control end of the switch tube Q1 is connected to the voltage detection module 31 through the resistor R4, and the second end of the switch tube Q1 is connected to the voltage adjustment module 33.

[0078] Specifically, when the output voltage of the power supply 100 is within the second voltage range and the voltage regulator U3 starts to work, or when the output voltage is within the fourth voltage range and the voltage regulator U2 starts to work, the switch tube Q1 is in the on state, and the output voltage is transmitted to the voltage adjustment module 33 through the switch tube Q1, so that the voltage adjustment module 33 adjusts the output voltage to a preset voltage and then outputs it to the load 200. When both the voltage regulator U3 and the voltage regulator U2 are not working, the switch tube Q1 is in the off state, thereby stopping the transmission of the output voltage.

[0079] In some embodiments, see Figure 4 , Figure 4 is a circuit diagram of a voltage segment identification circuit provided by another embodiment of the present invention, such as Figure 4 As shown, the voltage adjustment module 33 includes a voltage conversion chip U1, an inductor LD1, a resistor R3 and a resistor R8;

[0080] 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 R3, the resistor R3 is connected in series with the resistor R8, the resistor R3 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.

[0081] Specifically, when the switch tube Q1 is turned on, the output voltage of the power supply 100 will be input into the voltage conversion chip U1 through the switch tube Q1. 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.

[0082] In yet another embodiment, Figure 2 As shown, the voltage segment identification circuit 30 further includes a control module 34, and the control module 34 is connected to the switch module 32;

[0083] The control module 34 is used to receive a driving signal and control the switch module 32 to close or open based on the driving signal.

[0084] Specifically, the control module 34 is also used to connect with the controller 40. When the power supply 100 supplies power to the load 200, the controller 40 will detect the output voltage of the power supply 100 in real time, so that when the output voltage fluctuates and causes the switch tube Q1 to be disconnected by mistake, the controller 40 will output a first drive signal to the control module 34, so that the control module 34 controls the switch tube Q1 to close according to the first drive signal, thereby restoring the power supply circuit between the power supply 100 and the load 200. And, when the output voltage of the power supply 100 is lower than the set value, the controller 40 will output a second drive signal to the control module 34, so that the control module 34 controls the switch tube Q1 to be disconnected quickly, thereby disconnecting the output of the power supply 100, and then protecting the power supply 100.

[0085] In some embodiments, Figure 3 As shown, the control module 34 includes a switch tube Q2, a resistor R13 and a resistor R14;

[0086] The control end of the switch tube Q2 is connected to the controller 40 through the resistor R13, and the control end of the switch tube Q2 is also grounded through the resistor R14. The first end of the switch tube Q2 is connected to the switch module 32, and the second end of the switch tube Q2 is used for grounding.

[0087] Specifically, when the controller 40 outputs the first drive signal, the switch tube Q2 will be turned on based on the first drive signal, so that the control end of the switch tube Q1 is pulled low, and then the switch tube Q1 is turned on; and when the switch tube Q2 receives the second drive signal, the switch tube Q2 is turned off, and because the output voltage is lower than the set value, the regulator U2 and the regulator U3 will be quickly turned off, so that the switch tube Q1 is quickly turned off.

[0088] The embodiment of the present invention provides a voltage segment identification circuit, which includes a voltage detection module, a switch module and a voltage adjustment module; the voltage detection module is connected to the power supply and the switch module respectively, the switch module is connected to the power supply and the voltage adjustment module respectively, and the voltage adjustment module is used to connect the load; the voltage detection module is used to detect the output voltage of the power supply, and when the output voltage is within the second voltage range or the fourth voltage range, control the switch module to close so that the switch module transmits the output voltage to the voltage adjustment module; and when the output voltage is within the first voltage range or the third voltage range, control the switch module to disconnect so that the switch module stops transmitting the output voltage of the power supply, so that it can not only be compatible with different battery discharge requirements, but also avoid over-discharge when the power supply is insufficient, thereby extending the service life of the power supply. The voltage adjustment module is used to receive the output voltage of the power supply and adjust the output voltage to output a preset voltage to the load, thereby ensuring that the load works under a stable voltage and improving the reliability of the circuit.

[0089] 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 them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, 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 the present invention.

Claims

1. A voltage segment identification circuit, characterized in that: The voltage segment identification circuit includes a voltage detection module, a switch module and a voltage adjustment module; The voltage detection module is connected to the power supply and the switch module respectively, the switch module is connected to the power supply and the voltage adjustment module respectively, and the voltage adjustment module is used to connect the load; The voltage detection module is used to detect the output voltage of the power supply, and when the output voltage is within the second voltage range or the fourth voltage range, control the switch module to close, so that the switch module transmits the output voltage to the voltage adjustment module; as well as When the output voltage is within the first voltage range or the third voltage range, controlling the switch module to disconnect so that the switch module stops transmitting the output voltage of the power supply, wherein the second voltage range is greater than the first voltage range and less than the third voltage range, and the third voltage range is less than the fourth voltage range; The voltage adjustment module is used for receiving the output voltage transmitted by the switch module and adjusting the output voltage to output a preset voltage to the load.

2. The voltage segment identification circuit according to claim 1, characterized in that: The voltage detection module includes a first detection unit, a second detection unit and a third detection unit; The first detection unit is connected to the power supply and the second detection unit respectively, the second detection unit is connected to the power supply and the switch module respectively, and the third detection unit is connected to the power supply and the switch module respectively; The first detection unit is used to output a first control signal to the second detection unit when detecting that the output voltage of the power supply is within a first voltage range and a second voltage range; as well as When the output voltage of the power supply is within a third voltage range and a fourth voltage range, outputting a second control signal to the second detection unit; The second detection unit is used to obtain the output voltage of the power supply when receiving the first control signal, and detect whether the output voltage is within a first voltage range or a second voltage range, and if the output voltage is within the first voltage range, control the switch module to be disconnected, and if the output voltage is within the second voltage range, control the switch module to be closed; as well as upon receiving the second control signal, stopping operation according to the second control signal; The third detection unit is used to detect the output voltage of the power supply to determine whether the output voltage is within a fourth voltage range, and start working when the output voltage is within the fourth voltage range to control the switch module to close.

3. The voltage segment identification circuit according to claim 2, characterized in that: The first detection unit includes a voltage regulator tube DZ1, a resistor R11, a resistor R16 and a switch tube Q3; The cathode of the voltage regulator tube DZ1 is connected to the power supply, the anode of the voltage regulator tube DZ1 is connected to the control end of the switch tube Q3 through the resistor R11, the control end of the switch tube Q3 is also grounded through the resistor R16, the first end of the switch tube Q3 is connected to the second detection unit, and the second end of the switch tube Q3 is used for grounding.

4. The voltage segment identification circuit according to claim 2, characterized in that: The second detection unit includes a resistor R6, a resistor R17, a capacitor C10 and a voltage regulator U3; The reference input terminal of the voltage regulator U3 is connected to the power supply through the resistor R6, and the reference input terminal of the voltage regulator U3 is also grounded through the resistor R17. The reference input terminal of the voltage regulator U3 is also connected to the first detection unit, the capacitor C10 is connected in parallel with the resistor R17, the cathode of the voltage regulator U3 is connected to the switch module, and the anode of the voltage regulator U3 is used for grounding.

5. The voltage segment identification circuit according to claim 2, characterized in that: The third detection unit includes a voltage stabilizer U2, a resistor R7, a resistor R15 and a capacitor C11; The reference input terminal of the voltage regulator U2 is connected to the power supply through the resistor R7, and the reference input terminal of the voltage regulator U2 is also grounded through the resistor R15. The capacitor C11 is connected in parallel with the resistor R15. The cathode of the voltage regulator U2 is connected to the switch module, and the anode of the voltage regulator U2 is used for grounding.

6. The voltage segment identification circuit according to claim 1, characterized in that: The switch module includes a switch tube Q1, a resistor R2 and a resistor R4; The first end of the switch tube Q1 is connected to the power supply, the first end of the switch tube Q1 is also connected to the control end of the switch tube Q1 through the resistor R2, the control end of the switch tube Q1 is connected to the voltage detection module through the resistor R4, and the second end of the switch tube Q1 is connected to the voltage adjustment module.

7. The voltage segment identification circuit according to any one of claims 1 to 6, characterized in that: The voltage segment identification circuit also includes a control module; The control module is connected to the switch module; The control module is used to receive a driving signal and control the switch module to close or open based on the driving signal.

8. The voltage segment identification circuit according to claim 7, characterized in that: The control module includes a switch tube Q2, a resistor R13 and a resistor R14; The control end of the switch tube Q2 is connected to the controller through the resistor R13, and the control end of the switch tube Q2 is also grounded through the resistor R14. The first end of the switch tube Q2 is connected to the switch module, and the second end of the switch tube Q2 is used for grounding.

9. The voltage segment identification circuit according to claim 1, characterized in that: The voltage adjustment module includes a voltage conversion chip U1, an inductor LD1, a resistor R3 and a resistor R8; The input pin of the voltage conversion chip U1 is connected to the switch module, the output pin of the voltage conversion chip U1 is connected to the inductor LD1, the inductor LD1 is also connected to the resistor R3, the resistor R3 is connected in series with the resistor R8, the resistor R3 is also connected to the feedback pin of the voltage conversion chip U1, and the inductor LD1 is also used to connect a load.

10. A charger, characterized in that: The charger comprises a voltage segment identification circuit as described in any one of claims 1-9.

Images