Charging circuits, auxiliary power supplies and operating equipment

Abstract

The embodiments of the present invention provide a charging circuit, an auxiliary power supply and an operating device, and relate to the field of power supply technology. The charging circuit includes a low-voltage input module, a high-voltage input module and a power management module, the input end of the low-voltage input module and the input end of the high-voltage input module are both electrically connected to the input power supply, and the output end of the low-voltage input module and the output end of the high-voltage input module are both electrically connected to the power management module. When the power supply voltage provided by the input power supply is in the first voltage interval, the low-voltage input module is in a conducting state to provide the power supply voltage to the power management module; when the power supply voltage provided by the input power supply is in the second voltage interval, the high-voltage input module performs voltage conversion processing on the power supply voltage, obtains the conversion voltage, and provides the conversion voltage to the power management module; after receiving the power supply voltage or the conversion voltage, the power management module performs charging management. It can be applied to operating equipment with different rated voltages and has strong compatibility.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a charging circuit, an auxiliary power supply and an operating device. Background Art

[0002] Some current operating equipment has some circuit modules that still need power after the power is disconnected, so an auxiliary power supply is generally provided to continuously supply power to some circuit modules after the power is disconnected.

[0003] The input power of the auxiliary power supply is the rated voltage of the power supply of the operating equipment. Since the rated voltages of the power supplies of different operating equipment are different, and the acceptable charging voltage range of the auxiliary power supply is too narrow, the same auxiliary power supply cannot be applied to operating equipment with different rated voltages, making the existing auxiliary power supply incompatible. Summary of the invention

[0004] The objects of the present invention include, for example, providing a charging circuit, an auxiliary power supply and an operating device, which can be applied to operating devices with different rated voltages and have strong compatibility.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a charging circuit, comprising a low voltage input module, a high voltage input module and a power management module, wherein an input end of the low voltage input module and an input end of the high voltage input module are both electrically connected to an input power source, and an output end of the low voltage input module and an output end of the high voltage input module are both electrically connected to the power management module;

[0007] The low voltage input module is used to be in a conducting state when the supply voltage provided by the input power source is in a first voltage interval, so as to provide the supply voltage to the power management module;

[0008] The high-voltage input module is used for performing voltage conversion processing on the supply voltage when the supply voltage provided by the input power source is in the second voltage interval to obtain a conversion voltage, and providing the conversion voltage to the power management module;

[0009] The power management module is used to perform charging management after receiving the supply voltage or the conversion voltage.

[0010] In an optional embodiment, the low-voltage input module includes a voltage stabilizing unit and a switch unit, the voltage stabilizing unit is electrically connected between the input power supply and the ground line, the input end of the switch unit is electrically connected between the input power supply and the voltage stabilizing unit, and the output end of the switch unit is electrically connected to the power management module;

[0011] The voltage stabilizing unit is used for being in a disconnected state when the supply voltage is in a first voltage interval, so that the supply voltage is transmitted to the switch unit;

[0012] The switch unit is configured to be in a conducting state after receiving the supply voltage, so as to provide the supply voltage to the power management module.

[0013] In an optional embodiment, the voltage stabilizing unit includes a first voltage stabilizing diode, a cathode of the first voltage stabilizing diode is electrically connected to the input power supply, an anode of the first voltage stabilizing diode is electrically connected to the ground wire, and an input end of the switching unit is electrically connected between the cathode of the first voltage stabilizing diode and the input power supply.

[0014] In an optional embodiment, the switching unit includes a first switching tube, a second switching tube, a first resistor and a second resistor, the first pin and the second pin of the first switching tube are both electrically connected between the input power supply and the voltage stabilizing unit, the first resistor and the second resistor are connected in series between the input power supply and the ground wire, the third pin of the first switching tube and the first pin of the second switching tube are both electrically connected between the first resistor and the second resistor, the second pin of the second switching tube is electrically connected to the input power supply, and the third pin of the second switch tube is electrically connected to the power management module.

[0015] In an optional embodiment, the high-voltage input module includes a voltage dividing unit and a switching power supply unit, the voltage dividing unit is electrically connected between the input power supply and the ground line, the input end of the switching power supply unit is electrically connected to the input power supply, the enable end of the switching power supply unit is electrically connected to the voltage dividing unit, and the output end of the switching power supply unit is electrically connected to the power management module;

[0016] The voltage dividing unit is used to divide the supply voltage to obtain a divided voltage, and transmit the divided voltage to the enable terminal of the switching power supply unit;

[0017] The switching power supply unit is used to enable the supply voltage when the supply voltage is in the second voltage interval, and perform voltage conversion processing on the supply voltage to obtain the converted voltage.

[0018] In an optional embodiment, the voltage divider unit includes a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series between the input power supply and the ground line, and the enable end of the switching power supply unit is electrically connected between the third resistor and the fourth resistor.

[0019] In an optional embodiment, the switching power supply unit includes a switching power supply chip, an input end of the switching power supply chip is electrically connected to the input power supply, an enable end of the switching power supply chip is electrically connected to the voltage divider unit, and an output end of the switching power supply chip is electrically connected to the power management module.

[0020] In an optional embodiment, the power management module includes a charging management chip, and the charging management chip is electrically connected to the output end of the low voltage input module, the output end of the high voltage input module and the battery;

[0021] The charging management chip is used to charge the battery after receiving the supply voltage or the conversion voltage.

[0022] In a second aspect, an embodiment of the present invention provides an auxiliary power supply, comprising a charging circuit as described in any one of the aforementioned embodiments.

[0023] In a third aspect, an embodiment of the present invention provides an operating device, comprising an input power supply and an auxiliary power supply as described in the above embodiment.

[0024] The charging circuit, auxiliary power supply and operating equipment provided by the embodiment of the present invention, when the power supply voltage provided by the input power supply is in the first voltage range, the charging circuit supplies power to the power management module through the low voltage input module, so that the power management module performs charging management work; when the power supply voltage provided by the input power supply is in the second voltage range, the charging circuit supplies power to the power management module through the high voltage input module, so that the power management module performs charging management work. It can be seen that by setting the low voltage input module and the high voltage input module, the power management module can work when the power supply voltage provided by the input power supply is in the first voltage range and the second voltage range. In this way, the auxiliary power supply can meet the input power supply of multiple power supply voltages, improve the compatibility of the auxiliary power supply, and save development costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of an operating device provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of an auxiliary power supply provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the structure of a charging circuit provided by an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the structure of another charging circuit provided by an embodiment of the present invention;

[0030] Figure 5 A circuit diagram of a charging circuit provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the structure of another charging circuit provided by an embodiment of the present invention;

[0032] Figure 7 A circuit diagram of another charging circuit provided by an embodiment of the present invention;

[0033] Figure 8 A circuit diagram of another charging circuit provided by an embodiment of the present invention.

[0034] Icons: 10-operating equipment; 100-auxiliary power supply; 110-charging circuit; 111-low voltage input module; 1111-voltage stabilizing unit; 1112-switching unit; 112-high voltage input module; 1121-voltage dividing unit; 1122-switching power supply unit; 113-power management module; 120-battery; 200-input power supply; ZV1-first voltage stabilizing tube; ZV2-second voltage stabilizing tube; Q1-first switching tube; Q2-second switching tube; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; R9-ninth resistor; U1-switching power supply chip; U2-charging management chip; D1-first diode; D2-second diode; D4-indicator light; C1-first capacitor; L-inductor. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0040] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0041] Please refer to Figure 1 , is a schematic diagram of an implementable structure of an operating device 10 provided in this embodiment. The operating device 10 includes an input power supply 200 and an auxiliary power supply 100, the input power supply 200 is electrically connected to the auxiliary power supply 100, and the input power supply 200 is used to supply power to the auxiliary power supply 100 and other circuit modules in the operating device 10; the auxiliary power supply 100 is used to supply power to the circuit modules in the operating device 10 that need continuous power supply when the input power supply 200 cannot supply power.

[0042] It is understood that the operating equipment 10 may be a drone, an unmanned vehicle, a power system, or other electrical equipment. The input power supply 200 may be a power supply in the operating equipment 10. The auxiliary power supply 100 may be an uninterruptible power system (UPS) or other power supply including an energy storage device.

[0043] Please refer to Figure 2 ,for Figure 1 A schematic diagram of an implementable structure of an auxiliary power supply 100 is shown in FIG. The auxiliary power supply 100 includes a charging circuit 110, and the charging circuit 110 is electrically connected to the input power supply 200. The charging circuit 110 can perform charging management when the supply voltage provided by the input power supply 200 is in a first voltage interval and a second voltage interval, so that the auxiliary power supply 100 can be charged.

[0044] Furthermore, if Figure 2As shown, the auxiliary power supply 100 further includes a battery 120, and the battery 120 is electrically connected to the charging circuit 110. The charging circuit 110 is used to charge the battery 120 when the power supply voltage provided by the input power supply 200 is in the first voltage interval and the second voltage interval, so that when the input power supply 200 stops supplying power, the battery 120 supplies power to the circuit modules in the operating equipment 10 that need continuous power supply.

[0045] Please refer to Figure 3 ,for Figure 2 A schematic diagram of an implementable structure of a charging circuit 110 is shown in FIG. The charging circuit 110 includes a low voltage input module 111, a high voltage input module 112 and a power management module 113, the input end of the low voltage input module 111 and the input end of the high voltage input module 112 are both electrically connected to the input power source 200, and the output end of the low voltage input module 111 and the output end of the high voltage input module 112 are both electrically connected to the power management module 113.

[0046] In this embodiment, the low-voltage input module 111 is used to be in an on state when the supply voltage provided by the input power supply 200 is in a first voltage range, so as to provide the supply voltage to the power management module 113; the high-voltage input module 112 is used to perform voltage conversion processing on the supply voltage when the supply voltage provided by the input power supply 200 is in a second voltage range, obtain a conversion voltage, and provide the conversion voltage to the power management module 113; the power management module 113 is used to perform charging management after receiving the supply voltage or the conversion voltage.

[0047] It can be understood that when the magnitude of the supply voltage provided by the input power supply 200 is in the first voltage interval, the low voltage input module 111 is in the on state, and the high voltage input module 112 is in the stop voltage conversion processing state, so that the power management module 113 only receives the supply voltage provided by the low voltage input module 111. When the magnitude of the supply voltage provided by the input power supply 200 is in the second voltage interval, the high voltage input module 112 performs voltage conversion processing on the supply voltage to obtain the conversion voltage, and the low voltage input module 111 is in the off state, so that the power management module 113 only receives the conversion voltage provided by the high voltage input module 112. That is, the low voltage input module 111 and the high voltage input module 112 are not simultaneously on, and the supply voltage and the conversion circuit will not be provided to the power management module 113 at the same time.

[0048] For example, if the power management module 113 performs charging management in the 9V-15V power supply interval, if the first voltage interval is 9V-15V, and the second voltage interval is 25V-60V. When the power supply voltage provided by the input power supply 200 is 12V, since 12V falls within the first voltage interval, the low voltage input module 111 is in the on state, the high voltage input module 112 is in the stop voltage conversion processing state, and the low voltage input module 111 provides the 12V power supply voltage to the power management module 113. When the power supply voltage provided by the input power supply 200 is 48V, since 48V falls within the second voltage interval, the high voltage input module 112 converts the 48V power supply voltage to obtain the conversion voltage of the 9V-15V power supply interval, and the low voltage input module 111 is in the off state, so the high voltage input module 112 provides the conversion voltage of the 9V-15V power supply interval to the power management module 113.

[0049] It can be seen that by providing the low voltage input module 111 and the high voltage input module 112, the power management module 113 can work when the supply voltage provided by the input power supply 200 is in the first voltage range and the second voltage range. Thus, the auxiliary power supply 100 can meet the needs of input power supplies 200 with various supply voltages, thereby improving the compatibility of the auxiliary power supply 100 and saving development costs.

[0050] Please refer to Figure 4 ,for Figure 3 A schematic diagram of an implementable structure of a medium and low voltage input module 111, wherein the low voltage input module 111 includes a voltage stabilizing unit 1111 and a switch unit 1112, wherein the voltage stabilizing unit 1111 is electrically connected between an input power source 200 and a ground line, an input end of the switch unit 1112 is electrically connected between the input power source 200 and the voltage stabilizing unit 1111, and an output end of the switch unit 1112 is electrically connected to a power management module 113.

[0051] In this embodiment, the voltage stabilizing unit 1111 is configured to be in a disconnected state when the supply voltage is in a first voltage range so that the supply voltage is transmitted to the switch unit 1112; the switch unit 1112 is configured to be in a conductive state after receiving the supply voltage so as to provide the supply voltage to the power management module 113.

[0052] It can be understood that when the supply voltage is in the first voltage interval, the supply voltage is too low and the voltage stabilizing unit 1111 cannot be turned on. Therefore, the supply voltage will flow to the switch unit 1112, and the switch unit 1112 will be in a conducting state after receiving the supply voltage. Since the output end of the switch unit 1112 is electrically connected to the power management module 113, the switch unit 1112 will provide the supply voltage to the power management module 113.

[0053] For a detailed description of the working principle of the low voltage input module 111, please refer to Figure 5 ,for Figure 4 A schematic diagram of an implementable circuit of the low voltage input module 111 is shown. The voltage stabilizing unit 1111 includes a first voltage stabilizing tube ZV1, a cathode of the first voltage stabilizing tube ZV1 is electrically connected to the input power supply 200, an anode of the first voltage stabilizing tube ZV1 is electrically connected to the ground wire, and an input end of the switch unit 1112 is electrically connected between the cathode of the first voltage stabilizing tube ZV1 and the input power supply 200.

[0054] The switch unit 1112 includes a first switch tube Q1, a second switch tube Q2, a first resistor R1 and a second resistor R2. The first pin and the second pin of the first switch tube Q1 are both electrically connected between the input power supply 200 and the voltage stabilizing unit 1111. The first resistor R1 and the second resistor R2 are connected in series between the input power supply 200 and the ground line. The third pin of the first switch tube Q1 and the first pin of the second switch tube Q2 are both electrically connected between the first resistor R1 and the second resistor R2. The second pin of the second switch tube Q2 is electrically connected to the input power supply 200. The third pin of the second switch tube Q2 is electrically connected to the power management module 113.

[0055] It can be understood that the first pin and the second pin of the first switch tube Q1 are both electrically connected between the input power supply 200 and the cathode of the first voltage regulator tube ZV1. When the power supply voltage is in the first voltage interval, the power supply voltage is too low and the first voltage regulator tube ZV1 cannot be turned on, so the power supply voltage is provided to the first pin and the second pin of the first switch tube Q1, the second pin of the second switch tube Q2 and the first resistor R1. Since the first pin and the second pin of the first switch tube Q1 have the same potential, the first switch tube Q1 is not turned on. Since the first resistor R1 and the second resistor R2 divide the power supply voltage, the voltage of the first pin of the second switch tube Q2 is less than the voltage of the second pin of the second switch tube Q2, and the second switch tube Q2 is in the on state, so the third pin of the second switch tube Q2 will provide the power supply voltage to the power management module 113.

[0056] In this embodiment, the first switch tube Q1 may be a triode, the first pin of the first switch tube Q1 may be the base of the triode, the second pin of the first switch tube Q1 may be the emitter of the triode, and the third pin of the first switch tube Q1 may be the collector of the triode. The second switch tube Q2 may be a MOS (metal oxide semiconductor) tube, specifically a PMOS (positive channel Metal Oxide Semiconductor) tube, the first pin of the second switch tube Q2 may be the gate of the MOS tube, the second pin of the second switch tube Q2 may be the source of the MOS tube, and the third pin of the second switch tube Q2 may be the drain of the MOS tube.

[0057] To prevent current backflow, the voltage stabilizing unit 1111 further includes a first diode D1, a cathode of the first diode D1 is electrically connected to a cathode of the first voltage stabilizing tube ZV1, and an anode of the first diode D1 is electrically connected to both the input power supply 200 and the first pin of the first switch tube Q1.

[0058] In order to prevent the current of the first pin of the first switch tube Q1 from being too high, the voltage stabilizing unit 1111 further includes a fifth resistor R5, and the switch unit 1112 further includes a sixth resistor R6. The fifth resistor R5 and the sixth resistor R6 are connected in series between the input power supply 200 and the first pin of the first switch tube Q1, the anode of the first diode D1 is electrically connected between the fifth resistor R5 and the sixth resistor R6, and the second pin of the first switch tube Q1 is electrically connected between the input power supply 200 and the fifth resistor R5. The fifth resistor R5 and the sixth resistor R6 can play a current limiting role, reduce the input current of the first pin of the first switch tube Q1, and prevent the first switch tube Q1 from being damaged.

[0059] In order to prevent the second switch tube Q2 from being damaged, the switch unit 1112 further includes a second voltage regulator tube ZV2, the cathode of the second voltage regulator tube ZV2 is electrically connected to the second pin of the second switch tube Q2, and the anode of the second voltage regulator tube ZV2 is electrically connected to the first pin of the second switch tube Q2. The second voltage regulator tube ZV2 can be turned on when the voltage difference between the first pin and the second pin of the second switch tube Q2 is too large, thereby preventing the second switch tube Q2 from being damaged.

[0060] Please refer to Figure 6 ,for Figure 3A schematic diagram of an implementable structure of a medium- and high-voltage input module 112, wherein the high-voltage input module 112 includes a voltage divider unit 1121 and a switching power supply unit 1122, wherein the voltage divider unit 1121 is electrically connected between an input power supply 200 and a ground line, an input end of the switching power supply unit 1122 is electrically connected to the input power supply 200, an enable end of the switching power supply unit 1122 is electrically connected to the voltage divider unit 1121, and an output end of the switching power supply unit 1122 is electrically connected to a power management module 113.

[0061] In this embodiment, the voltage divider unit 1121 is used to perform voltage division processing on the supply voltage to obtain the divided voltage, and transmit the divided voltage to the enable end of the switching power supply unit 1122; the switching power supply unit 1122 is used to enable when the supply voltage is in the second voltage range, perform voltage conversion processing on the supply voltage, and obtain a converted voltage.

[0062] It can be understood that the divided voltage is less than the power supply voltage. When the power supply voltage is in the second voltage interval, the divided voltage obtained by the voltage dividing unit 1121 is greater than the enable voltage of the switching power supply unit 1122, and the switching power supply unit 1122 can start working to convert the power supply voltage into the conversion voltage. When the power supply voltage is in the first voltage interval, the divided voltage obtained by the voltage dividing unit 1121 is less than the enable voltage of the switching power supply unit 1122, and the switching power supply unit 1122 does not work and does not convert the power supply voltage.

[0063] To describe the working principle of the high voltage input module 112 in detail, please refer to Figure 7 ,for Figure 6 A schematic diagram of an implementable circuit of the high-voltage input module 112 is shown. The voltage dividing unit 1121 includes a third resistor R3 and a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are connected in series between the input power supply 200 and the ground line, and the enable terminal of the switching power supply unit 1122 is electrically connected between the third resistor R3 and the fourth resistor R4.

[0064] The switching power supply unit 1122 includes a switching power supply chip U1, an input end of the switching power supply chip U1 is electrically connected to the input power supply 200, an enable end of the switching power supply chip U1 is electrically connected to the voltage divider unit 1121, and an output end of the switching power supply chip U1 is electrically connected to the power management module 113.

[0065] In this embodiment, the enable terminal of the switching power chip U1 is electrically connected between the third resistor R3 and the fourth resistor R4. If the enable voltage of the switching power chip U1 is 1.3V, when the power supply voltage is in the first voltage range, the voltage divided by the third resistor R3 and the fourth resistor R4 is lower than the enable voltage, and the switching power chip U1 is in a stopped working state. When the power supply voltage is in the second voltage range, the voltage divided by the third resistor R3 and the fourth resistor R4 is higher than the enable voltage, and the switching power chip U1 works normally, converts the power supply voltage into a conversion voltage, and provides it to the power management module 113.

[0066] In order to adjust the size of the conversion voltage, the switching power supply unit 1122 also includes a first capacitor C1, an inductor L, a second diode D2, a seventh resistor R7 and an eighth resistor R8. The first capacitor C1 and the inductor L are connected in series between the self-boosting terminal of the switching power supply chip U1 and the seventh resistor R7, the seventh resistor R7 and the eighth resistor R8 are connected in series between the inductor L and the ground line, the feedback terminal of the switching power supply chip U1 is electrically connected between the seventh resistor R7 and the eighth resistor R8, the cathode of the second diode D2 is electrically connected between the first capacitor C1 and the inductor L, the anode of the second diode D2 is electrically connected to the ground line, and the switch control terminal of the switching power supply chip U1 is electrically connected between the first capacitor C1 and the inductor L. The output size of the conversion voltage can be adjusted by the first capacitor C1, the inductor L, the second diode D2, the seventh resistor R7 and the eighth resistor R8.

[0067] Please refer to Figure 8 ,for Figure 3 A schematic diagram of an implementable circuit of the power management module 113, the power management module 113 includes a charging management chip U2, the charging management chip U2 is electrically connected to the output end of the low-voltage input module 111, the output end of the high-voltage input module 112 and the battery 120; the charging management chip U2 is used to charge the battery 120 after receiving the power supply voltage or the conversion voltage.

[0068] It can be understood that the input end of the charging management chip U2 is electrically connected to the third pin of the second switch tube Q2, the input end of the charging management chip U2 is electrically connected between the inductor L and the seventh resistor R7, and the output end of the charging management chip U2 is electrically connected to the battery 120. After the input end of the charging management chip U2 receives the supply voltage or the conversion voltage, the charging management chip U2 will charge the battery 120.

[0069] In order to remind the staff whether the battery 120 is in a charging state, the power management module 113 also includes a ninth resistor R9 and an indicator light D4, which are connected in series between the input end of the charging management chip U2 and the charging status indication end of the charging management chip U2.

[0070] It can be understood that when the input end of the charging management chip U2 receives the supply voltage or the conversion voltage, the indicator light D4 will generate a light prompt signal. The ninth resistor R9 is used to adjust the input current of the indicator light D4 to adjust the brightness of the indicator light D4.

[0071] For ease of understanding, the working principle of the charging circuit 110 is now described in detail. If the power management module 113 performs charging management in the 9V-15V power supply range, if the first voltage range is 9V-15V, the second voltage range is 25V-60V, and the enable voltage is 1.3V. When the supply voltage provided by the input power supply 200 is between 9V and 15V, for the high-voltage input module 112, the voltage at the enable end of the switching power chip U1 is lower than 1.3V through the voltage division of the third resistor R3 and the fourth resistor R4, and the switching power chip U1 stops working; for the low-voltage input module 111, because the cathode potential of the first voltage regulator ZV1 is lower than the turn-on voltage (the turn-on voltage can be set to 15V), the first voltage regulator ZV1 is not turned on, the first pin and the second pin of the first switch tube Q1 have the same potential, the first switch tube Q1 is not turned on, and because the potential of the second pin of the second switch tube Q2 is higher than the potential of the first pin of the second switch tube Q2, the second switch tube Q2 is in the on state, and the third pin of the second switch tube Q2 transmits the supply voltage to the input end of the charging management chip U2.

[0072] When the supply voltage provided by the input power supply 200 is between 16V and 25V, for the high-voltage input module 112, the voltage at the enable end of the switch power chip U1 is lower than 1.3V through the voltage division of the third resistor R3 and the fourth resistor R4, and the switch power chip U1 stops working; for the low-voltage input module 111, because the cathode potential of the first voltage regulator ZV1 is higher than the conduction voltage, the first voltage regulator ZV1 is turned on, and the potential is clamped at the conduction voltage, so that a circuit loop is formed between the input power supply 200, the first voltage regulator ZV1 and the ground wire, and a current I1 is obtained. For the first switch Q1, In other words, since the first pin of the first switch tube Q1 is smaller than the second pin of the first switch tube Q1, the first switch tube Q1 is turned on, forming a loop of the input power supply 200, the first switch tube Q1, the second resistor R2 and the ground line, and the current I2 formed by the input power supply 200, the first switch tube Q1, the second resistor R2 and the ground line loop flows through the second resistor R2, so that the voltage of the first pin of the second switch tube Q2 satisfies Vg=(I1+I2)*r2≈Vs, the second switch tube Q2 is turned off, the low-voltage input module 111 does not work, and stops providing the supply voltage to the input end of the charging management chip U2. Among them, Vg is the voltage of the first pin of the second switch tube Q2, I1 is the circuit loop current formed between the input power supply 200, the first voltage regulator tube ZV1 and the ground line, I2 is the circuit loop current formed between the input power supply 200, the first switch tube Q1, the second resistor R2 and the ground line, r2 is the resistance value of the second resistor R2, and Vs is the voltage of the second pin of the second switch tube Q2.

[0073] When the supply voltage provided by the input power supply 200 is between 26V and 60V, for the high-voltage input module 112, the voltage of the enable terminal of the switch power chip U1 is higher than 1.3V through the voltage division of the third resistor R3 and the fourth resistor R4, and the switch power chip U1 works normally. The switch power chip U1 converts the supply voltage into a conversion voltage and provides the conversion voltage to the input terminal of the charging management chip U2; for the low-voltage input module 111, because the cathode potential of the first voltage regulator ZV1 is higher than the conduction voltage, the first voltage regulator ZV1 is turned on, and the potential is clamped at the conduction voltage, so that a voltage difference is formed between the input power supply 200, the first voltage regulator ZV1 and the ground line. The circuit loop obtains the current I1. For the first switch tube Q1, since the first pin of the first switch tube Q1 is smaller than the second pin of the first switch tube Q1, the first switch tube Q1 is turned on to form an input power supply 200, the first switch tube Q1, the second resistor R2 and a ground loop. The current I2 formed by the input power supply 200, the first switch tube Q1, the second resistor R2 and the ground loop flows through the second resistor R2, so that the voltage of the first pin of the second switch tube Q2 satisfies Vg=(I1+I2)*r2≈Vs, the second switch tube Q2 is turned off, the low-voltage input module 111 does not work, and stops providing the power supply voltage to the input end of the charging management chip U2.

[0074] In summary, the embodiment of the present invention provides a charging circuit, an auxiliary power supply and an operating device. The charging circuit includes a low-voltage input module, a high-voltage input module and a power management module. The input end of the low-voltage input module and the input end of the high-voltage input module are both electrically connected to the input power supply, and the output end of the low-voltage input module and the output end of the high-voltage input module are both electrically connected to the power management module. The low-voltage input module is used to be in a conductive state when the power supply voltage provided by the input power supply is in the first voltage interval, so as to provide the power supply voltage to the power management module; the high-voltage input module is used to perform voltage conversion processing on the power supply voltage when the power supply voltage provided by the input power supply is in the second voltage interval, obtain the conversion voltage, and provide the conversion voltage to the power management module; the power management module is used to perform charging management after receiving the power supply voltage or the conversion voltage. It can be seen that by setting the low-voltage input module and the high-voltage input module, the power management module can work when the power supply voltage provided by the input power supply is in the first voltage interval and the second voltage interval. In this way, the auxiliary power supply can meet the input power supply of multiple power supply voltages, improve the compatibility of the auxiliary power supply, and save development costs.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A charging circuit, It is characterized in that It includes a low voltage input module, a high voltage input module and a power management module, wherein the input end of the low voltage input module and the input end of the high voltage input module are both electrically connected to the input power supply, and the output end of the low voltage input module and the output end of the high voltage input module are both electrically connected to the power management module; The low voltage input module is used to be in a conducting state when the supply voltage provided by the input power source is in a first voltage interval, so as to provide the supply voltage to the power management module; The high-voltage input module is used for performing voltage conversion processing on the supply voltage when the supply voltage provided by the input power source is in the second voltage interval to obtain a conversion voltage, and providing the conversion voltage to the power management module; The power management module is used to perform charging management after receiving the supply voltage or the conversion voltage; The low voltage input module comprises a voltage stabilizing unit and a switch unit, wherein the voltage stabilizing unit is electrically connected between the input power supply and the ground line, the input end of the switch unit is electrically connected between the input power supply and the voltage stabilizing unit, and the output end of the switch unit is electrically connected to the power management module; The voltage stabilizing unit is used for being in a disconnected state when the supply voltage is in a first voltage interval, so that the supply voltage is transmitted to the switch unit; The switch unit is used to be in a conducting state after receiving the supply voltage, so as to provide the supply voltage to the power management module; The high-voltage input module includes a voltage dividing unit and a switching power supply unit, the voltage dividing unit is electrically connected between the input power supply and the ground line, the input end of the switching power supply unit is electrically connected to the input power supply, the enable end of the switching power supply unit is electrically connected to the voltage dividing unit, and the output end of the switching power supply unit is electrically connected to the power management module; The voltage dividing unit is used to divide the supply voltage to obtain a divided voltage, and transmit the divided voltage to the enable terminal of the switching power supply unit; The switching power supply unit is used to enable the supply voltage when the supply voltage is in the second voltage interval, and perform voltage conversion processing on the supply voltage to obtain the converted voltage.

2. The charging circuit according to claim 1, It is characterized in that The voltage stabilizing unit includes a first voltage stabilizing tube, a cathode of the first voltage stabilizing tube is electrically connected to the input power supply, an anode of the first voltage stabilizing tube is electrically connected to the ground wire, and an input end of the switch unit is electrically connected between the cathode of the first voltage stabilizing tube and the input power supply.

3. The charging circuit according to claim 1, It is characterized in that The switch unit includes a first switch tube, a second switch tube, a first resistor and a second resistor. The first pin and the second pin of the first switch tube are both electrically connected between the input power supply and the voltage stabilizing unit. The first resistor and the second resistor are connected in series between the input power supply and the ground line. The third pin of the first switch tube and the first pin of the second switch tube are both electrically connected between the first resistor and the second resistor. The second pin of the second switch tube is electrically connected to the input power supply. The third pin of the second switch tube is electrically connected to the power management module.

4. The charging circuit according to claim 1, It is characterized in that The voltage dividing unit includes a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series between the input power supply and the ground line, and the enable terminal of the switching power supply unit is electrically connected between the third resistor and the fourth resistor.

5. The charging circuit according to claim 1, It is characterized in that The switching power supply unit comprises a switching power supply chip, an input end of the switching power supply chip is electrically connected to the input power supply, an enable end of the switching power supply chip is electrically connected to the voltage divider unit, and an output end of the switching power supply chip is electrically connected to the power management module.

6. The charging circuit according to claim 1, It is characterized in that The power management module includes a charging management chip, and the charging management chip is electrically connected to the output end of the low voltage input module, the output end of the high voltage input module and the battery; The charging management chip is used to charge the battery after receiving the supply voltage or the conversion voltage.

7. An auxiliary power supply, It is characterized in that Comprising a charging circuit as described in any one of claims 1-6.

8. An operating device, It is characterized in that Comprises an input power supply and an auxiliary power supply as claimed in claim 7.

Images