Charging circuit with self-adaptive output current, charging equipment and electronic equipment

Abstract

The utility model discloses a charging circuit with self-adaptive output current, charging equipment and electronic equipment. The charging circuit comprises a power supply input unit, a voltage conversion unit, an operational amplification adjusting unit, a feedback unit and a linear charging unit. The power supply input unit generates a corresponding first power supply voltage according to external power supply input; the operational amplification adjusting unit generates a first adjusting signal according to the first power supply voltage; the feedback unit generates a second adjusting signal according to the first adjusting signal; the voltage conversion unit converts the first power supply voltage to obtain a corresponding second power supply voltage based on the second adjusting signal; and the linear charging unit outputs self-adaptive charging current according to the change of the second power supply voltage. According to the utility model, large current pulling of the external power supply input can be effectively avoided, and a proper charging current is matched according to the external power supply input, so that the stability and reliability of equipment and the user experience are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit charging, and particularly relates to a charging circuit with self-adaptive output current, a charging device and an electronic device. Background Art

[0002] With the rapid development of technology, the charging current of portable intelligent devices has been increasing continuously. The problem that the input power supply drops voltage due to too large charging current has become a common challenge. However, there are the following problems in the existing charging circuits: they usually adopt the method of fixed charging current. In the case of insufficient input power supply capacity, this is likely to cause the input power supply to drop voltage, resulting in some chips being damaged due to sudden voltage drop, thus affecting the charging and use of the device, not only shortening the service life of the device, but also having a negative impact on the user experience. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a charging circuit with self-adaptive output current, a charging device and an electronic device.

[0004] The technical solution adopted by the utility model to solve its technical problem is to provide a charging circuit with self-adaptive output current, including: a power input unit, a voltage conversion unit, an operational amplifier adjustment unit, a feedback unit and a linear charging unit;

[0005] The power input unit is connected to an external power supply input, and is used for generating a corresponding first supply voltage according to the external power supply input;

[0006] The operational amplifier adjustment unit is connected to the power input unit and the feedback unit, and is used for generating a first adjustment signal according to the first supply voltage and transmitting it to the feedback unit;

[0007] The feedback unit is connected to the voltage conversion unit, and is used for generating a second adjustment signal according to the first adjustment signal and transmitting it to the voltage conversion unit;

[0008] The voltage conversion unit is connected to the power input unit, and is used for converting the first supply voltage to obtain a corresponding second supply voltage based on the second adjustment signal;

[0009] The linear charging unit is connected to the voltage conversion unit, and is used for outputting an adaptive charging current according to the change of the second supply voltage.

[0010] Preferably, the voltage conversion unit includes at least one of the following power supply units: a boost power supply unit, a buck power supply unit, a buck-boost power supply unit and a linear power supply unit.

[0011] Preferably, the voltage conversion unit further includes a switching unit connected to each power supply unit respectively, which is used to switch different power supply units to convert the first supply voltage.

[0012] Preferably, the boost power supply unit includes: a boost chip U1, a first enable circuit, an input capacitor, an FB matching resistor circuit, an inductor L1, and a diode D1;

[0013] The enable signal output terminal of the first enable circuit is connected to the fourth pin of the boost chip U1;

[0014] The positive terminal of the input capacitor is respectively connected to the power input unit and the fifth pin of the boost chip U1, and the negative terminal of the input capacitor is grounded;

[0015] The inductor L1 is connected between the fifth pin and the first pin of the boost chip U1;

[0016] The positive terminal of the diode D1 is connected to the first pin of the boost chip U1, and the negative terminal of the diode D1 is connected to the power supply terminal of the FB matching resistor circuit and is connected to the linear charging unit;

[0017] The voltage dividing terminal of the FB matching resistor circuit is connected to the third pin of the boost chip U1, and the signal input terminal of the FB matching resistor circuit is connected to the feedback unit.

[0018] Preferably, the operational amplifier adjustment unit includes an operational amplifier U2, a voltage dividing circuit, a second enable circuit, a diode D2, and a resistor R5;

[0019] The enable signal output terminal of the second enable circuit is connected to the fifth pin of the operational amplifier U2;

[0020] The voltage dividing terminal of the voltage dividing circuit is connected to the third pin of the operational amplifier U2, and the voltage input terminal of the voltage dividing circuit is connected to the power input unit;

[0021] The diode D2 is connected in parallel with the resistor R5. The negative terminal of the diode D2 is connected to the first pin of the operational amplifier U2, and the positive terminal of the diode D2 is connected to the first input terminal of the feedback unit;

[0022] The fourth pin of the operational amplifier U2 is connected to the second input terminal of the feedback unit.

[0023] Preferably, the feedback unit includes a MOS transistor Q1 and a resistor R16;

[0024] The source of the MOS transistor Q1 is the second input terminal of the feedback unit and is grounded through the resistor R16; the gate of the MOS transistor Q1 is the first input terminal of the feedback unit; the drain of the MOS transistor Q1 is connected to the voltage conversion unit.

[0025] Preferably, the linear charging unit includes a linear charging chip U3, a resistor R13, a resistor R14, and a third enabling circuit;

[0026] One end of the resistor R13 and the resistor R14 are both connected to the second pin of the linear charging chip U3, and the other ends are both grounded;

[0027] The enabling signal output terminal of the third enabling circuit is connected to the eighth pin of the linear charging chip U3;

[0028] The fourth pin of the linear charging chip U3 is connected to the voltage conversion unit, and the fifth pin is the power output terminal of the linear charging unit.

[0029] There is also provided a charging device with adaptive output current, including the charging circuit with adaptive output current described in any one of the above.

[0030] There is also provided an electronic device, including a battery unit and the charging circuit with adaptive output current described in any one of the above. The charging circuit with adaptive output current is connected to the battery unit to charge the battery unit.

[0031] Preferably, the battery unit includes a battery. The positive electrode of the battery is connected to the linear charging unit, and the negative electrode of the battery is grounded.

[0032] Implementing the charging circuit, charging device, and electronic device with adaptive output current of the present invention has the following beneficial effects: generating a corresponding first supply voltage according to the external power input, obtaining a second adjustment signal according to the first supply voltage, the voltage conversion unit generating a second supply voltage corresponding to the first supply voltage based on the second adjustment signal, and then outputting an adaptive charging current after being processed by the linear charging unit, effectively avoiding large current pulling on the external power input, matching a suitable charging current according to the external power input, thereby improving the stability and reliability of the device and enhancing the user experience. Description of the Drawings

[0033] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0034] Figure 1 is a schematic structural diagram of an embodiment of a charging circuit with adaptive output current of the present invention;

[0035] Figure 2It is the circuit schematic diagram of the boost power supply unit according to an embodiment of the present utility model;

[0036] Figure 3 It is the circuit schematic diagram of the operational amplifier adjustment unit according to an embodiment of the present utility model;

[0037] Figure 4 It is the circuit schematic diagram of the feedback unit according to an embodiment of the present utility model;

[0038] Figure 5 It is the circuit schematic diagram of the linear charging unit according to an embodiment of the present utility model;

[0039] Figure 6 It is the structural schematic diagram of the voltage conversion unit according to an embodiment of the present utility model;

[0040] Figure 7 It is the structural schematic diagram of an embodiment of an electronic device according to the present utility model. Detailed implementation manners

[0041] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings.

[0042] As Figure 1 shown, in an embodiment of a charging circuit with adaptive output current according to the present utility model, it includes: a power input unit 110, a voltage conversion unit 120, an operational amplifier adjustment unit 130, a feedback unit 140, and a linear charging unit 150. The power input unit 110 is connected to an external power input and is used to generate a corresponding first supply voltage according to the external power input; the operational amplifier adjustment unit 130 is connected to the power input unit 110 and the feedback unit 140 and is used to generate a first adjustment signal according to the first supply voltage and transmit it to the feedback unit 140; the feedback unit 140 is connected to the voltage conversion unit 120 and is used to generate a second adjustment signal according to the first adjustment signal and transmit it to the voltage conversion unit 120; the voltage conversion unit 120 is connected to the power input unit 110 and is used to convert the first supply voltage into a corresponding second supply voltage based on the second adjustment signal; the linear charging unit 150 is connected to the voltage conversion unit 120 and is used to output an adaptive charging current according to the change of the second supply voltage.

[0043] Specifically, the power input unit 110 can refer to the prior art. The power input unit 110 processes the external power input through filtering and the like, converts the external power input into a first supply voltage, and supplies power to the voltage conversion unit 120 and the operational amplifier adjustment unit 130 through the first supply voltage. Among them, the first supply voltage is a DC voltage and changes correspondingly with the change of the external power input. The operational amplifier adjustment unit 130 generates a first adjustment signal according to the first supply voltage, and the feedback unit 140 generates a second adjustment signal according to the first adjustment signal and transmits it to the voltage conversion unit 120. Under the adjustment of the second adjustment signal, the voltage conversion unit 120 converts the first supply voltage into a second supply voltage. Among them, the first adjustment signal changes based on the first supply voltage of the power input unit 110, and the second adjustment signal also changes accordingly, so that the second supply voltage maintains a preset constant difference from the first supply voltage. When the first supply voltage changes, the second supply voltage also changes accordingly. The linear charging unit 150 generates an adaptive charging current based on the change of the second supply voltage, so as to charge the electrical device.

[0044] The charging circuit with adaptive output current in this embodiment can effectively avoid large current pulling on the external power input, match a suitable charging current according to the external power input, thereby improving the stability and reliability of the device and enhancing the user experience.

[0045] The voltage conversion unit 120 in this embodiment is a DC-DC power supply unit. Optionally, the voltage conversion unit 120 adopts a boost power supply unit, as Figure 2 shown, the boost power supply unit includes: a boost chip U1, a first enable circuit, an input capacitor C1, an FB matching resistor circuit, an inductor L1, and a diode D1. The enable signal output terminal of the first enable circuit is connected to the fourth pin of the boost chip U1; the positive terminal of the input capacitor C1 is respectively connected to the power input unit 110 and the fifth pin of the boost chip U1, and the negative terminal of the input capacitor C1 is connected to the ground; the inductor L1 is connected between the fifth pin and the first pin of the boost chip U1; the positive terminal of the diode D1 is connected to the first pin of the boost chip U1, and the negative terminal of the diode D1 is connected to the power supply terminal of the FB matching resistor circuit and is connected to the linear charging unit 150; the voltage dividing terminal of the FB matching resistor circuit is connected to the third pin of the boost chip U1, and the signal input terminal of the FB matching resistor circuit is connected to the feedback unit 140.

[0046] Specifically, the first enabling circuit includes resistor R1, resistor R3, and capacitor C9. One end of resistor R1 is the enabling signal input terminal of the first enabling circuit, and the other end is grounded through resistor R3 and grounded through capacitor C9 and then serves as the enabling signal output terminal, which is connected to the fourth pin of boost chip U1. The FB matching resistor circuit includes resistor R2, resistor R4, and capacitor C4. Resistor R2 is in parallel with capacitor C4, resistor R2 is in series with resistor R4, the common terminal where resistor R2 and resistor R4 are connected is the voltage dividing terminal of the FB matching resistor circuit, the other end is the power supply terminal of the FB matching resistor circuit, and the other end of resistor R4 is the signal input terminal of the FB matching resistor circuit. Further, the boost power supply unit further includes capacitor C2 and capacitor C3. One end of capacitor C2 is connected between the positive terminal of input capacitor C1 and the fifth pin of boost chip U1, and the other end is connected to the negative terminal of input capacitor C1; one end of capacitor C3 is connected between the positive terminal of input capacitor C1 and the fifth pin of boost chip U1, and the other end is connected to the negative terminal of input capacitor C1.

[0047] The boost power supply unit obtains a second adjustment signal according to the voltage division value of resistor R2 and resistor R4, boosts the first supply voltage into a second supply voltage, and delivers it to the linear charging unit 150. In an embodiment, the boost chip U1 selects the ACP2756BAA model chip of Naxium Micro (ACPSEMI).

[0048] Optionally, as Figure 3 shown, the operational amplifier adjustment unit 130 of this embodiment includes operational amplifier U2, a voltage division circuit, a second enabling circuit, diode D2, and resistor R5. The enabling signal output terminal of the second enabling circuit is connected to the fifth pin of operational amplifier U2; the voltage dividing terminal of the voltage division circuit is connected to the third pin of operational amplifier U2, and the voltage input terminal of the voltage division circuit is connected to the power supply input unit 110; diode D2 is in parallel with resistor R5, the negative terminal of diode D2 is connected to the first pin of operational amplifier U2, the positive terminal of diode D2 is connected to the first input terminal of the feedback unit 140; the fourth pin of operational amplifier U2 is connected to the second input terminal of the feedback unit 140.

[0049] Specifically, the voltage dividing circuit includes resistor R8 and resistor R10. One end of resistor R8 serves as the voltage input terminal of the voltage dividing circuit, and the other end is grounded through resistor R10. Among them, the common terminal formed by resistor R8 and resistor R10 is the voltage dividing terminal of the voltage dividing circuit. The second enabling circuit includes resistor R6 and resistor R9 connected in series. The common terminal of resistor R6 and resistor R9 is the enabling signal output terminal of the second enabling circuit. The other end of resistor R6 serves as the enabling signal input terminal of the second enabling circuit, and the other end of resistor R9 is grounded. The sixth pin of operational amplifier U2 is connected to the power input unit 110 to obtain electrical energy and is grounded through capacitor C10. The fourth pin of operational amplifier U2 is connected to the second input terminal of the feedback unit 140 through resistor R12. The first pin of operational amplifier U2 is also grounded through resistor R7 and is connected to the fourth pin through capacitor C11.

[0050] The operational amplifier adjustment unit 130 obtains the first supply voltage according to the voltage division value of resistor R8 and resistor R10, thereby generating a first adjustment signal, and outputs it to the feedback unit 140 through the first pin and the fourth pin. In one embodiment, the model of the operational amplifier U2 is SGM8623.

[0051] Optionally, as Figure 4 shown, the feedback unit 140 of this embodiment includes MOS transistor Q1 and resistor R16; the source electrode (MOS S) of MOS transistor Q1 is the second input terminal of the feedback unit 140 and is grounded through resistor R16; the gate electrode (MOS G) of MOS transistor Q1 is the first input terminal of the feedback unit 140; the drain electrode (MOS D) of MOS transistor Q1 is connected to the voltage conversion unit 120. The operational amplifier adjustment unit 130 outputs a first adjustment signal to control the conduction degree of MOS transistor Q1, so that the MOS transistor operates in the variable resistance region or the conduction region, changing the resistance value of the feedback unit 140, thereby outputting a second adjustment signal to the voltage conversion unit 120, so that the second supply voltage generated by the voltage conversion unit 120 changes.

[0052] Optionally, as Figure 5 shown, the linear charging unit 150 of this embodiment includes a linear charging chip U3, resistor R13, resistor R14, and a third enabling circuit. One end of resistor R13 and resistor R14 are both connected to the second pin of the linear charging chip U3, and the other end is grounded; the enabling signal output terminal of the third enabling circuit is connected to the eighth pin of the linear charging chip U3; the fourth pin of the linear charging chip U3 is connected to the voltage conversion unit 120, and the fifth pin is the power output terminal of the linear charging unit 150.

[0053] Specifically, the third enabling circuit includes a resistor R17, a resistor R18, and a capacitor C14. One end of the resistor R17 is the enabling signal input terminal of the third enabling circuit, and the other end is grounded through the resistor R18. The capacitor C14 is connected in parallel with the resistor R18. Among them, the common terminal of the resistor R17 and the resistor R18 is the enabling signal output terminal of the third enabling circuit. The fourth pin of the linear charging chip U3 is connected to the voltage conversion unit 120 to obtain the second power supply voltage and is grounded through the resistor R11. A capacitor C13 is also connected in parallel across the two ends of the resistor R11. The first pin of the linear charging chip U3 is grounded through the resistor R15, and the fifth pin is also grounded through the capacitor C12.

[0054] The linear charging chip U3 changes the output charging current according to the change of the second power supply voltage to generate an adaptive charging current. In one embodiment, the model of the linear charging chip U3 is LP4076H.

[0055] In an alternative embodiment, the linear charging unit 150 further includes an indicator light module connected to the linear charging chip U3, which lights up to give a prompt when charging the electrical device.

[0056] In this embodiment, the voltage conversion unit 120 employs a boost power supply unit. In other embodiments, the voltage conversion unit 120 may adopt other types of DC-DC power supply units, or multiple power supply units may be used simultaneously, and the number of the same type of power supply units may also be multiple. It can be understood that the voltage conversion unit 120 includes at least one of the following power supply units: a boost power supply unit, a buck power supply unit, a buck-boost power supply unit, and a linear power supply unit. Among them, the buck power supply unit, the buck-boost power supply unit, and the linear power supply unit can refer to the prior art.

[0057] As Figure 6 shown, when the number of power supply units is greater than one, the voltage conversion unit 120 further includes a switching unit 1202 respectively connected to each power supply unit for switching different power supply units to convert the first power supply voltage.

[0058] In this embodiment, the voltage conversion unit 120 includes a power supply unit group 1201, which are respectively the first power supply unit 12011, the second power supply unit... the Nth power supply unit 1201N (where N is an integer greater than one). One end of the switching unit 1202 is connected to the power input unit 110, and the other end is respectively connected to each power supply unit, which can switch different power supply units to convert the first power supply voltage. For example, when the external input power is relatively high, a buck power supply unit is selected to step down to obtain the second power supply voltage. It can be understood that when different power supply units are switched, the constant difference between the first power supply voltage and the second power supply voltage will also change accordingly.

[0059] In this embodiment, the switching unit 1202 is not limited. Specifically, reference can be made to the prior art, as long as it can switch different power supply units, such as using a relay.

[0060] In an embodiment of the charging device with output current self - adaptation of the present utility model, it includes the output current self - adapting charging circuit of any of the above - mentioned embodiments. This charging device can be a charger, an adapter, a power bank, etc. It uses the output current self - adapting charging circuit of the present utility model to charge the electrical device, effectively avoiding large - current pulling on the input power supply, and matching a suitable charging current according to the input power supply to prevent abnormal shutdown and restart of the electronic device.

[0061] As Figure 7 shown, in an embodiment of the electronic device of the present utility model, it includes a battery unit 160 and the output current self - adapting charging circuit of any of the above - mentioned embodiments. The output current self - adapting charging circuit is connected to the battery unit 160 to charge the battery unit 160. This electronic device can be a barcode scanning device, an industrial control device, a communication device, a medical electronic device, etc. The battery unit 160 and the output current self - adapting charging circuit can be integrally arranged or detachably connected. The linear charging unit 150 is connected to the battery unit 160 to charge it, ensuring the stability of the input power supply voltage during charging.

[0062] Furthermore, the battery unit 160 includes a battery. The positive electrode of the battery is connected to the linear charging unit 150, and the negative electrode of the battery is connected to the ground. In this embodiment, the battery unit 160 selects a lithium battery of model 18650, and its positive electrode is connected to the fifth pin of the linear charging chip U3.

[0063] It can be understood that the above - mentioned embodiments only represent some implementation manners of the present utility model. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above - mentioned technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model should fall within the scope covered by the claims of the present utility model.

Claims

1. A charging circuit with adaptive output current, characterized in that: include: Power input unit, voltage conversion unit, operational amplifier adjustment unit, feedback unit and linear charging unit; The power input unit is connected to an external power input and is used to generate a corresponding first power supply voltage according to the external power input; The operational amplifier adjustment unit is connected to the power input unit and the feedback unit, and is used to generate a first adjustment signal according to the first power supply voltage, and transmit the first adjustment signal to the feedback unit; The feedback unit is connected to the voltage conversion unit, and is used to generate a second adjustment signal according to the first adjustment signal, and transmit the second adjustment signal to the voltage conversion unit; The voltage conversion unit is connected to the power input unit, and is used to convert the first supply voltage into a corresponding second supply voltage based on the second adjustment signal; The linear charging unit is connected to the voltage conversion unit and is used for outputting an adaptive charging current according to a change of the second supply voltage.

2. The output current adaptive charging circuit according to claim 1, characterized in that: The voltage conversion unit includes at least one of the following power supply units: a boost power supply unit, a buck power supply unit, a buck-boost power supply unit, and a linear power supply unit.

3. The output current adaptive charging circuit according to claim 2, characterized in that: The voltage conversion unit also includes a switching unit connected to each power supply unit respectively, and is used to switch different power supply units to convert the first supply voltage.

4. The output current adaptive charging circuit according to claim 2, characterized in that: The boost power supply unit includes: a boost chip U1, a first enabling circuit, an input capacitor, an FB matching resistor circuit, an inductor L1 and a diode D1; The enable signal output terminal of the first enable circuit is connected to the fourth pin of the boost chip U1; The positive terminal of the input capacitor is connected to the power input unit and the fifth pin of the boost chip U1 respectively, and the negative terminal of the input capacitor is connected to the ground; The inductor L1 is connected between the fifth pin and the first pin of the boost chip U1; The positive terminal of the diode D1 is connected to the first pin of the boost chip U1, and the negative terminal of the diode D1 is connected to the power supply end of the FB matching resistor circuit and connected to the linear charging unit; The voltage dividing end of the FB matching resistor circuit is connected to the third pin of the boost chip U1 , and the signal input end of the FB matching resistor circuit is connected to the feedback unit.

5. The output current adaptive charging circuit according to claim 1, characterized in that: The operational amplifier adjustment unit includes an operational amplifier U2, a voltage divider circuit, a second enabling circuit, a diode D2, and a resistor R5; The enable signal output terminal of the second enabling circuit is connected to the fifth pin of the operational amplifier U2; The voltage dividing end of the voltage dividing circuit is connected to the third pin of the operational amplifier U2, and the voltage input end of the voltage dividing circuit is connected to the power input unit; The diode D2 is connected in parallel with the resistor R5, the cathode end of the diode D2 is connected to the first pin of the operational amplifier U2, and the anode end of the diode D2 is connected to the first input end of the feedback unit; The fourth pin of the operational amplifier U2 is connected to the second input terminal of the feedback unit.

6. The output current adaptive charging circuit according to claim 1, characterized in that: The feedback unit includes a MOS tube Q1 and a resistor R16; The source of the MOS transistor Q1 is the second input terminal of the feedback unit and is grounded through the resistor R16; the gate of the MOS transistor Q1 is the first input terminal of the feedback unit; and the drain of the MOS transistor Q1 is connected to the voltage conversion unit.

7. The output current adaptive charging circuit according to claim 1, characterized in that: The linear charging unit includes a linear charging chip U3, a resistor R13, a resistor R14 and a third enabling circuit; One end of the resistor R13 and the resistor R14 are both connected to the second pin of the linear charging chip U3, and the other ends are both grounded; The enable signal output terminal of the third enabling circuit is connected to the eighth pin of the linear charging chip U3; The fourth pin of the linear charging chip U3 is connected to the voltage conversion unit, and the fifth pin is the power output end of the linear charging unit.

8. A charging device with adaptive output current, characterized in that: A charging circuit with adaptive output current comprising the one described in any one of claims 1-7.

9. An electronic device, characterized in that: It comprises a battery cell and the output current adaptive charging circuit as claimed in any one of claims 1 to 7, wherein the output current adaptive charging circuit is connected to the battery cell to charge the battery cell.

10. The electronic device according to claim 9, characterized in that: The battery unit comprises a battery, a positive electrode of the battery is connected to the linear charging unit, and a negative electrode of the battery is connected to the ground.

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