CN216413941U - Charging port power supply control circuit of battery equipment - Google Patents
Charging port power supply control circuit of battery equipment Download PDFInfo
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- CN216413941U CN216413941U CN202122182726.XU CN202122182726U CN216413941U CN 216413941 U CN216413941 U CN 216413941U CN 202122182726 U CN202122182726 U CN 202122182726U CN 216413941 U CN216413941 U CN 216413941U
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Abstract
The utility model provides a charging port power supply control circuit of battery equipment, wherein a DC-DC power supply module is connected with a battery of the battery equipment and a power supply pin of a charging port, a switch circuit is connected between an input pin and an enabling pin of the DC-DC power supply module, a high-low level control circuit is connected between the enabling pin of the DC-DC power supply module and the power supply pin of the charging port, a voltage division circuit is connected between the battery of the battery equipment and the power supply pin of the charging port, the DC-DC power supply module is connected with the power supply pin of the charging port, the high-low level control circuit is connected with a current sampling detection circuit through a comparison amplification circuit, and the current sampling detection circuit is connected with a state detection pin of the charging port. When the external electronic equipment is in a charging state and the battery type electronic product is shut down, the USB port of the battery type electronic product continues to be charged outwards, and when the external electronic equipment is fully charged, the battery type electronic product is automatically shut down, so that zero external power consumption of the battery of the external electronic equipment is realized, and the endurance time of the battery is prolonged.
Description
Technical Field
The utility model relates to the technical field of battery type electronic products with a USB charging function, in particular to a charging port power supply control circuit of battery type equipment.
Background
When the battery type electronic product is started, the USB port can charge the external electronic equipment. When the external electronic equipment is in a charging state and the battery type electronic product is shut down, the battery type electronic product is powered off, and the USB port of the external electronic equipment does not supply power to the outside, so that the external electronic equipment cannot be continuously charged, and the cruising ability of the battery of the external electronic equipment is influenced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a charging port power supply control circuit of a battery device, which detects the charging current/voltage of an external electronic device through an operational amplifier, and solves the problem that the external electronic device stops being charged after the battery device is shut down.
The utility model provides a charging port power supply control circuit of battery equipment, which comprises a DC-DC power supply module, a switching circuit, a current sampling detection circuit, a comparison amplification circuit, a high-low level control circuit and a voltage division circuit, wherein the DC-DC power supply module is connected with a battery of the battery equipment and a power supply pin of a charging port, the switching circuit is connected between an input pin and an enable pin of the DC-DC power supply module, the high-low level control circuit is connected between an enable pin of the DC-DC power supply module and a power supply pin of the charging port, the voltage division circuit is connected between the battery of the battery equipment and the power supply pin of the charging port, the DC-DC power supply module is connected with the power supply pin of the charging port, the high-low level control circuit is connected with the comparison amplification circuit, and the comparison amplification circuit is connected with the current sampling detection circuit, the current sampling detection circuit and the state detection pin of the charging port.
Further, the current sampling detection circuit comprises a sampling resistor, and the sampling resistor is connected with the state detection pin of the charging port and the comparison amplification circuit.
Furthermore, the comparison and amplification circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a first capacitor, the first resistor is connected to the positive input terminal of the operational amplifier, the second resistor is connected to the negative input terminal of the operational amplifier, the third resistor is connected between the output terminal and the negative input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the fourth resistor, the fourth resistor is connected to the high-low level control circuit, the sampling resistor is connected between the first resistor and the second resistor, one end of the fifth resistor and one end of the first capacitor are both connected between the fourth resistor and the high-low level control circuit, and the other end of the fifth resistor and the other end of the first capacitor are both grounded.
Furthermore, the high-low level control circuit comprises a first triode, a sixth resistor, a seventh resistor, a second triode, an eighth resistor and a second capacitor, the fourth resistor is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, one end of the sixth resistor is connected with a power supply pin of the charging port, the other end of the sixth resistor is connected with a collector of the first triode, one end of the seventh resistor and one end of the second capacitor, the other end of the second capacitor is grounded, the other end of the seventh resistor is connected with one end of the eighth resistor and the base electrode of the second triode, the other end of the eighth resistor is grounded, an emitter of the second triode is grounded, and a collector of the second triode is connected with the voltage division circuit and an enabling pin of the DC-DC power supply module.
Further, the voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are connected in series, the first voltage dividing resistor is connected to a power supply pin of the charging port, the second voltage dividing resistor is connected to a battery of a battery device, and a collector of the second transistor is connected between the first voltage dividing resistor and the second voltage dividing resistor.
Further, the switching circuit includes a switch connected between an input pin and an enable pin of the DC-DC power supply module.
The filter circuit comprises a first filter capacitor, a second filter capacitor and a third filter capacitor, one end of a parallel circuit of the first filter capacitor and the second filter capacitor is connected between a battery of the battery equipment and an input pin of the DC-DC power module, the other end of the parallel circuit is connected with one end of the third filter capacitor, the second voltage-dividing resistor and the ground, and the other end of the third filter capacitor is connected with an enabling pin of the DC-DC power module.
The self-starting circuit comprises a self-starting capacitor, and the self-starting capacitor is connected between a self-boosting pin and an inductance connection feedback input pin of the DC-DC power supply module.
The DC-DC power supply module further comprises an RC absorption circuit, wherein the RC absorption circuit comprises a ninth resistor and a third capacitor, the ninth resistor is connected with the third capacitor in series, the third capacitor is grounded, and the ninth resistor is connected with an inductance connection feedback input pin of the DC-DC power supply module.
The charging circuit comprises a DC-DC power supply module, a charging port and an LC filter circuit, wherein the charging port is connected with the DC-DC power supply module, the LC filter circuit comprises a filter capacitor and a filter inductor, the filter capacitor is connected with the filter inductor, the filter capacitor is connected with an inductor connection feedback input pin of the DC-DC power supply module, a power supply pin of the charging port is connected between the filter capacitor and the filter inductor, and the filter capacitor is grounded;
the DC-DC power supply module is characterized by further comprising a feedback circuit, wherein the feedback circuit comprises a first feedback resistor, a second feedback resistor and a third feedback resistor, the first feedback resistor, the second feedback resistor and the third feedback resistor are sequentially connected in series, the first feedback resistor is connected between the filter inductor and the filter capacitor, the third feedback resistor is grounded, and a voltage feedback input end of the DC-DC power supply module is connected between the first feedback resistor and the second feedback resistor.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a charging port power supply control circuit of battery equipment, which is characterized in that a current sampling detection circuit is added to detect the charging current (voltage) of external electronic equipment, and then the output voltage of a comparison amplification circuit is used for controlling the conduction and the cut-off of a triode so as to control the power supply voltage of a USB port. When the external electronic equipment is in a charging state and the battery type electronic product is shut down, the USB port of the battery type electronic product continues to be charged outwards, and when the external electronic equipment is fully charged, the battery type electronic product is automatically shut down, so that zero external power consumption of the battery of the external electronic equipment is realized, and the endurance time of the battery is prolonged.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
FIG. 1 is a schematic diagram of a charging port power control circuit for a battery-type device according to the present invention;
fig. 2 is a circuit diagram of a charging port power supply control circuit of a battery-type device according to an embodiment of the utility model.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
A charging port power supply control circuit of a battery device realizes charging of internal batteries of external electronic devices such as android mobile phones and notebook computers. As shown in fig. 1 and fig. 2, the device includes a DC-DC power module U1, a switch circuit, a current sampling detection circuit, a comparison amplification circuit, a high-low level control circuit, and a voltage dividing circuit, where the DC-DC power module is connected to a battery BAT + of a battery device and a power supply pin VBUS of a charging port, and the charging port is a USB-a plug in this embodiment. The switching circuit is connected between an input pin IN and an enable pin EN of the DC-DC power supply module, the high-low level control circuit is connected between the enable pin of the DC-DC power supply module and a power supply pin of the charging port, the voltage division circuit is connected between a battery of the battery equipment and the power supply pin of the charging port, the DC-DC power supply module is connected with the power supply pin of the charging port, the high-low level control circuit is connected with the comparison amplification circuit, the comparison amplification circuit is connected with the current sampling detection circuit, and the current sampling detection circuit is connected with the state detection pin of the charging port.
The charging port is connected with a current sampling detection circuit, the current sampling detection circuit inputs detected voltage into a comparison amplification circuit for voltage comparison and amplification, the comparison amplification circuit outputs the voltage to control a high-low level control circuit, the high-low level generated by the high-low level control circuit controls an enabling pin EN of a DC-DC power supply module, when the enabling pin EN is at a high level, the USB port charges external electronic equipment, when the enabling pin EN is at a low level, the USB port does not charge the external electronic equipment and is automatically shut down, external zero power consumption of an electronic product battery is realized, and the endurance time of the battery is prolonged.
As shown in fig. 2, the switching circuit includes a switch SW1 connected between the input pin and the enable pin of the DC-DC power supply module.
The current sampling detection circuit comprises a sampling resistor R6, and the sampling resistor is connected with a state detection pin ID of the charging port and the comparison amplification circuit.
The comparison amplifying circuit comprises an operational amplifier U2-A, a first resistor R4, a second resistor R5, a third resistor R3, a fourth resistor R2, a fifth resistor R1 and a first capacitor C1, wherein the first resistor is connected with the positive input end of the operational amplifier, the second resistor is connected with the negative input end of the operational amplifier, the third resistor is connected between the output end and the negative input end of the operational amplifier, the output end of the operational amplifier is connected with the fourth resistor, the fourth resistor is connected with the high-low level control circuit, the sampling resistor is connected between the first resistor and the second resistor, one end of the fifth resistor and one end of the first capacitor are both connected between the fourth resistor and the high-low level control circuit, and the other end of the fifth resistor and the other end of the first capacitor are both grounded.
The high-low level control circuit comprises a first triode Q1, a sixth resistor R7, a seventh resistor R14, a second triode Q2, an eighth resistor R17 and a second capacitor C2, wherein the fourth resistor is connected with the base of the first triode, the emitting electrode of the first triode is grounded, one end of the sixth resistor is connected with a power supply pin of a charging port, the other end of the sixth resistor is connected with the collector electrode of the first triode, one end of the seventh resistor and one end of the second capacitor, the other end of the second capacitor is grounded, the other end of the seventh resistor is connected with one end of the eighth resistor and the base of the second triode, the other end of the eighth resistor is grounded, the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is connected with an enabling pin of a voltage division circuit and a DC-DC power supply module.
The voltage division circuit comprises a first voltage division resistor R8 and a second voltage division resistor R16, the first voltage division resistor and the second voltage division resistor are connected in series, the first voltage division resistor is connected with a power supply pin of the charging port, the second voltage division resistor is connected with a battery of the battery type equipment, and a collector of the second triode is connected between the first voltage division resistor and the second voltage division resistor.
In an embodiment, the power supply further comprises a filter circuit, the filter circuit comprises a first filter capacitor C8, a second filter capacitor C5 and a third filter capacitor C4, one end of a parallel circuit of the first filter capacitor and the second filter capacitor is connected between a battery of the battery-type device and an input pin of the DC-DC power module, the other end of the parallel circuit is connected with one end of the third filter capacitor, the second voltage-dividing resistor and the ground, and the other end of the third filter capacitor is connected with an enable pin of the DC-DC power module.
The self-starting circuit comprises a self-starting capacitor C7, and the self-starting capacitor is connected between a self-boosting pin BS and an inductance connection feedback input pin LX of the DC-DC power supply module.
The RC absorption circuit comprises a ninth resistor R13 and a third capacitor C6, the ninth resistor is connected with the third capacitor in series, the third capacitor is grounded, and the ninth resistor is connected with an inductance connection feedback input pin FB of the DC-DC power supply module.
The DC-DC power supply module is characterized by further comprising an LC filter circuit, wherein the LC filter circuit comprises a filter capacitor L1 and a filter inductor C9, the filter capacitor is connected with the filter inductor, the filter capacitor is connected with an inductor connection feedback input pin of the DC-DC power supply module, a power supply pin of a charging port is connected between the filter capacitor and the filter inductor, and the filter capacitor is grounded;
the DC-DC power supply module further comprises a feedback circuit, wherein the feedback circuit comprises a first feedback resistor R9, a second feedback resistor R10 and a third feedback resistor R11, the first feedback resistor, the second feedback resistor and the third feedback resistor are sequentially connected in series, the first feedback resistor is connected between the filter inductor and the filter capacitor, the third feedback resistor is grounded, and the voltage feedback input end of the DC-DC power supply module is connected between the first feedback resistor and the second feedback resistor.
When the switch circuit is pressed to be ON/OFF, the SW1 switch is instantly switched, the battery voltage is applied to the EN pin of U1, U1 has 5V voltage output, then 5V voltage is fed back to the EN pin of U1 through R8, meanwhile, the 5V voltage is applied to C2/220UF through R7, the electrifying moment of C2 is equivalent to short circuit, Q2 is not conducted, U1 normally works, 5V voltage is output to the VBUS power supply pin of the USB socket, the USB socket has a load to charge, current flows from the VBUS pin to the ID pin and flows from the ID pin, when 80MA current flows through the R6 with the sampling 0.039R, the voltage difference generated at the two ends of R6 is: the voltage difference is sent to pins 1 and 3 of the operational amplifier U2-a, respectively, and after 221 times of amplification (forward amplification: G1 + Rf/R1 +220/1), the voltage of 0.69V is output, that is, 80MA current is converted into 0.69V, and after R1 and R2 voltage division, the voltage of 0.69V x (R1/R1+ R2) is 0.69V x (12/0.68+12) 0.65V. The resistance of R1 and R2 is required to satisfy the condition that the forward bias of the transistor is equal to 0.7V. The resistance of the R4 input resistor is required to meet the requirement that VOUT can not be less than 0.7V so as to ensure that the rear stage triode can be normally conducted, and the resistance of the R5 resistor is required to be the same as that of R4 so as to reduce errors and drift. This voltage is applied to the base of transistor Q1, Q1 turns on, and the base of Q2 turns off at a low level. At this time, 5V voltage is applied to the EN pin of U1 through R8, and U1 outputs 5V voltage to supply power to the USB port. Conversely, when the current flowing through R6 is less than about 50MA, the voltage difference between the two ends of R6 is: the voltage is amplified 221 times inside the operational amplifier (forward amplification: G1 + Rf/R1 +220/1), then 0.43V is output, the voltage is divided by R1 and R2 to 0.43V x (12/0.68+12) 0.4V, the voltage is applied to the base of the triode Q1, Q1 is cut off, at this time, 5V is applied to the base of Q2 through R7, Q2 is turned on, the collector and the emitter are connected to the ground, the EN pin voltage of U1 is pulled down to the ground, U1 stops working, no 5V voltage is output to the USB port, and no external electronic device is charged.
In this embodiment, the sampling current greater than about 80M is defined as the charging threshold, which is in accordance with the minimum charging current of most external electronic devices, which is at least in the range of 80MA to 150 MA. And (4) when the sampling current is smaller than 80MA and approaches 50MA to 0MA, the external electronic equipment is in a full charge state by default, and the external electronic equipment is accurately and automatically turned off.
According to the utility model, a current signal is converted into a voltage signal through a current sampling detection circuit, then the voltage is output after a comparison amplification circuit to control the conduction and the cut-off of the triode, the conduction and the grounding of the triode are low level, and the pull-up bias is high level after the cut-off of the triode, so that the level of an enable pin EN of a DC-DC power supply module U1 is controlled to realize the turn-off of the power supply of a USB port, further, the battery type equipment is not turned off in the charging process of the external electronic equipment, and the battery type equipment is automatically turned off after the external electronic equipment is fully charged, so that the external zero power consumption of the external electronic equipment is realized, and the endurance time of the battery is prolonged.
The foregoing is merely a preferred embodiment of the utility model and is not intended to limit the utility model in any manner; those skilled in the art can readily practice the utility model as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the utility model as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A charging port power supply control circuit of a battery type device is characterized in that: comprises a DC-DC power supply module, a switch circuit, a current sampling detection circuit, a comparison amplification circuit, a high-low level control circuit and a voltage division circuit, the DC-DC power supply module is connected with a battery of the battery equipment and a power supply pin of a charging port, the switch circuit is connected between an input pin and an enable pin of the DC-DC power supply module, the high-low level control circuit is connected between an enabling pin of the DC-DC power supply module and a power supply pin of the charging port, the voltage division circuit is connected between the battery of the battery type equipment and a power supply pin of the charging port, the DC-DC power supply module is connected with a power supply pin of the charging port, the high-low level control circuit is connected with the comparison amplifying circuit, the comparison amplifying circuit is connected with the current sampling detection circuit, and the current sampling detection circuit is connected with the state detection pin of the charging port.
2. A charging port power supply control circuit for a battery-type device according to claim 1, characterized in that: the current sampling detection circuit comprises a sampling resistor, and the sampling resistor is connected with the state detection pin of the charging port and the comparison amplification circuit.
3. A charging port power supply control circuit for a battery-type device according to claim 2, characterized in that: the comparison amplifying circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first capacitor, wherein the first resistor is connected with the positive input end of the operational amplifier, the second resistor is connected with the negative input end of the operational amplifier, the third resistor is connected between the output end and the negative input end of the operational amplifier, the output end of the operational amplifier is connected with the fourth resistor, the fourth resistor is connected with the high-low level control circuit, the sampling resistor is connected between the first resistor and the second resistor, one end of the fifth resistor and one end of the first capacitor are connected between the fourth resistor and the high-low level control circuit, and the other end of the fifth resistor and the other end of the first capacitor are grounded.
4. A charging port power supply control circuit for a battery-type device according to claim 3, characterized in that: the high-low level control circuit comprises a first triode, a sixth resistor, a seventh resistor, a second triode, an eighth resistor and a second capacitor, the fourth resistor is connected with the base electrode of the first triode, the emitting electrode of the first triode is grounded, one end of the sixth resistor is connected with a power supply pin of the charging port, the other end of the sixth resistor is connected with a collector of the first triode, one end of the seventh resistor and one end of the second capacitor, the other end of the second capacitor is grounded, the other end of the seventh resistor is connected with one end of the eighth resistor and the base electrode of the second triode, the other end of the eighth resistor is grounded, an emitter of the second triode is grounded, and a collector of the second triode is connected with the voltage division circuit and an enabling pin of the DC-DC power supply module.
5. A charging port power supply control circuit for a battery-type device according to claim 4, characterized in that: the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor are connected in series, the first voltage dividing resistor is connected with a power supply pin of the charging port, the second voltage dividing resistor is connected with a battery of a battery device, and a collector of the second triode is connected between the first voltage dividing resistor and the second voltage dividing resistor.
6. A charging port power supply control circuit for a battery-type device according to claim 1, characterized in that: the switching circuit includes a switch coupled between an input pin and an enable pin of the DC-DC power supply module.
7. A charging port power supply control circuit for a battery-type device according to claim 5, characterized in that: the filter circuit comprises a first filter capacitor, a second filter capacitor and a third filter capacitor, one end of a parallel circuit of the first filter capacitor and the second filter capacitor is connected between a battery of the battery equipment and an input pin of the DC-DC power module, the other end of the parallel circuit is connected with one end of the third filter capacitor, the second divider resistor and the ground, and the other end of the third filter capacitor is connected with an enabling pin of the DC-DC power module.
8. A charging port power supply control circuit for a battery-type device according to claim 1, characterized in that: the self-starting circuit comprises a self-starting capacitor, and the self-starting capacitor is connected between a self-boosting pin and an inductance connection feedback input pin of the DC-DC power supply module.
9. A charging port power supply control circuit for a battery-type device according to claim 1, characterized in that: the RC absorption circuit comprises a ninth resistor and a third capacitor, the ninth resistor is connected with the third capacitor in series, the third capacitor is grounded, and the ninth resistor is connected with an inductance connection feedback input pin of the DC-DC power supply module.
10. A charging port power supply control circuit for a battery-type device according to claim 1, characterized in that: the DC-DC power supply module is characterized by further comprising an LC filter circuit, wherein the LC filter circuit comprises a filter capacitor and a filter inductor, the filter capacitor is connected with the filter inductor, the filter capacitor is connected with an inductor connection feedback input pin of the DC-DC power supply module, a power supply pin of the charging port is connected between the filter capacitor and the filter inductor, and the filter capacitor is grounded;
the DC-DC power supply module is characterized by further comprising a feedback circuit, wherein the feedback circuit comprises a first feedback resistor, a second feedback resistor and a third feedback resistor, the first feedback resistor, the second feedback resistor and the third feedback resistor are sequentially connected in series, the first feedback resistor is connected between the filter inductor and the filter capacitor, the third feedback resistor is grounded, and a voltage feedback input end of the DC-DC power supply module is connected between the first feedback resistor and the second feedback resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122182726.XU CN216413941U (en) | 2021-09-09 | 2021-09-09 | Charging port power supply control circuit of battery equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122182726.XU CN216413941U (en) | 2021-09-09 | 2021-09-09 | Charging port power supply control circuit of battery equipment |
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| Publication Number | Publication Date |
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| CN216413941U true CN216413941U (en) | 2022-04-29 |
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| CN202122182726.XU Active CN216413941U (en) | 2021-09-09 | 2021-09-09 | Charging port power supply control circuit of battery equipment |
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- 2021-09-09 CN CN202122182726.XU patent/CN216413941U/en active Active
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