A mobile power supply control circuit

Abstract

The invention discloses a mobile power control circuit, comprising a control unit, wherein the control unit comprises a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, a fourth digital potentiometer, and a first connector, wherein one end of the third resistor, a first pin of the fourth digital potentiometer, and a power supply are connected, the other end of the third resistor, one end of the seventh resistor, a third pin of the fourth digital potentiometer, a fifth pin of the fourth digital potentiometer, and the first connector are connected, the other end of the seventh resistor, one end of the eighth resistor, and an inverting end of a first operational amplifier are connected, the seventh pin of the fourth digital potentiometer is connected to one end of the fifth resistor, the second pin of the fourth digital potentiometer, one end of the fourth resistor, and an output end of the first operational amplifier are connected, and the other end of the fourth resistor, the other end of the eighth resistor, a sixth pin of the fourth digital potentiometer, and a grounding end are connected.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a mobile power supply control circuit. Background Art

[0002] A mobile power bank is an electronic device that can be carried at any time. During outdoor activities, it can charge our mobile phones, tablet computers and other electronic devices. When the mobile power bank is discharged from a fully charged state, the voltage will drop over time. Since the load resistance is fixed, the current required will decrease, so the current needs to be controlled. Therefore, a mobile power supply control circuit that can facilitate constant current regulation is proposed, and the supply current can be controlled with low power consumption. Summary of the invention

[0003] In view of the above technical problems, the object of the present invention is to provide a mobile power control circuit, including a control unit, the control unit including a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a fourth digital potentiometer U4, and a first connector P1, one end of the third resistor R3, a first pin of the fourth digital potentiometer U4 and a power supply are connected, the other end of the third resistor R3 and one end of the seventh resistor R7, the third pin of the fourth digital potentiometer U4, the fifth pin of the fourth digital potentiometer U4, and the first connector P1 are connected, the other end of the seventh resistor R7 and one end of the eighth resistor R8 and the inverting end of the first operational amplifier U1 are connected, the seventh pin of the fourth digital potentiometer U4 and one end of the fifth resistor R5 are connected, the second pin of the fourth digital potentiometer U4 and one end of the fourth resistor R4 and the output end of the first operational amplifier U1 are connected, and the other end of the fifth resistor R5, the other end of the fourth resistor R4, the other end of the eighth resistor R8, and the sixth pin of the fourth digital potentiometer U4 are connected to the ground.

[0004] Furthermore, the control unit also includes a fifteenth resistor R15, a seventeenth resistor R17, a sixth trigger U6, an eighth inverter U8, and a second connector P2, one end of the seventeenth resistor R17, a fourth pin of the sixth trigger U6 and a power supply are connected, the other end of the seventeenth resistor R17 is connected to the first pin of the sixth trigger U6, the second pin of the sixth trigger U6 is connected to the sixth pin of the sixth trigger U6, the third pin of the sixth trigger U6 is connected to one end of the fifteenth resistor R15 and the second connector P2, the fifth pin of the sixth trigger U6 is connected to the input end of the eighth inverter U8, the output end of the eighth inverter U8 is connected to one end of the fifth resistor R5, and the other end of the fifteenth resistor R15 is connected to the ground end.

[0005] Further, the control unit also includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a sixteenth resistor R16, a third thyristor U3, a fifth thyristor U5, a seventh AND gate U7, a first MOS tube Q1, a second transistor Q2, a third transistor Q3, a first diode D1, and a second diode D2. The output end of the seventh AND gate U7 is connected to the second connector P2, the first input end of the seventh AND gate U7 is connected to one end of the sixteenth resistor R16 and the cathode of the fifth thyristor U5, the second input end of the seventh AND gate U7 is connected to one end of the twelfth resistor R12 and the cathode of the third thyristor U3, the control electrode of the third thyristor U3 is connected to one end of the thirteenth resistor R13 and the emitter of the second transistor Q2, the base of the second transistor Q2 is connected to the cathode of the first diode D1, and the first diode The anode of the transistor D1 is connected to the anode of the second diode D2 and the output end of the first operational amplifier U1, the collector of the second triode Q2, the collector of the third triode Q3, and one end of the eleventh resistor R11 are connected to the power supply, the base of the third triode Q3 is connected to the input end of the eighth inverter U8, the emitter of the third triode Q3 is connected to the anode of the third thyristor U3 and the anode of the fifth thyristor U5, the control electrode of the fifth thyristor U5 is connected to one end of the tenth resistor R10 and the drain of the first MOS tube Q1, the gate of the first MOS tube Q1 is connected to the cathode of the second diode D2, the source of the first MOS tube Q1 is connected to the other end of the eleventh resistor R11 and one end of the fourteenth resistor R14, the other end of the tenth resistor R10, the other end of the twelfth resistor R12, the other end of the thirteenth resistor R13, the other end of the fourteenth resistor R14, the other end of the sixteenth resistor R16 and the ground are connected.

[0006] Furthermore, the control unit also includes a first resistor R1, a second resistor R2, a sixth resistor R6, and a second voltage stabilizing chip U2, one end of the first resistor R1 is connected to a power supply, the other end of the first resistor R1 is connected to one end of the sixth resistor R6 and the cathode of the second voltage stabilizing chip U2, the other end of the sixth resistor R6 is connected to the in-phase end of the first operational amplifier U1, the control electrode of the second voltage stabilizing chip U2, and one end of the second resistor R2, and the other end of the second resistor R2, the anode of the second voltage stabilizing chip U2 and the ground end are connected.

[0007] Furthermore, the control unit also includes a fourth transistor Q4 and a third connector P3, the base of the fourth transistor Q4 is connected to the third connector P3, the collector of the fourth transistor Q4 is connected to the first pin of the sixth trigger U6, and the emitter of the fourth transistor Q4 is connected to the ground terminal.

[0008] Furthermore, the control unit further includes a ninth resistor R9, one end of the ninth resistor R9 is connected to the gate of the first MOS transistor Q1, and the other end of the ninth resistor R9 is connected to the ground.

[0009] Furthermore, it also includes an indicating unit, which is composed of a light emitting diode or a buzzer. The signal is input through the seventh pin of the fourth digital potentiometer U4 to indicate the current adjustment state.

[0010] The beneficial effects of the present invention compared with the prior art are:

[0011] The present invention can detect and adjust the battery power supply current to prevent the power supply current from decreasing due to the battery power decreasing with use. It has the functions of real-time detection of high power consumption and fixed-point detection of low power consumption. The fixed-point detection can control the adjustment frequency according to the duty cycle of the pulse signal or realize the control through the single pulse input frequency, and the single pulse can confirm the adjustment state according to the actual detected adjustment time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 The present invention provides an overall structural diagram.

[0014] Figure 2 This is a schematic diagram of the circuit structure of the control unit provided by the present invention. DETAILED DESCRIPTION

[0015] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0016] The present invention discloses a mobile power control circuit, comprising a control unit, wherein the control unit comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a fourth digital potentiometer U4, and a first connector P1, wherein one end of the third resistor R3 and a first pin of the fourth digital potentiometer U4 are connected to a power supply, the other end of the third resistor R3 and one end of the seventh resistor R7, a third pin of the fourth digital potentiometer U4, a fifth pin of the fourth digital potentiometer U4, and the first connector P1 are connected, the other end of the seventh resistor R7 and one end of the eighth resistor R8 and an inverting end of a first operational amplifier U1 are connected, the seventh pin of the fourth digital potentiometer U4 and one end of the fifth resistor R5 are connected, the second pin of the fourth digital potentiometer U4 and one end of the fourth resistor R4 and an output end of the first operational amplifier U1 are connected, and the other end of the fifth resistor R5, the other end of the fourth resistor R4, the other end of the eighth resistor R8, and a sixth pin of the fourth digital potentiometer U4 are connected to a grounding end.

[0017] Specifically, the control unit also includes a fifteenth resistor R15, a seventeenth resistor R17, a sixth trigger U6, an eighth inverter U8, and a second connector P2. One end of the seventeenth resistor R17, the fourth pin of the sixth trigger U6 and the power supply are connected, the other end of the seventeenth resistor R17 is connected to the first pin of the sixth trigger U6, the second pin of the sixth trigger U6 is connected to the sixth pin of the sixth trigger U6, the third pin of the sixth trigger U6 is connected to one end of the fifteenth resistor R15 and the second connector P2, the fifth pin of the sixth trigger U6 is connected to the input end of the eighth inverter U8, the output end of the eighth inverter U8 is connected to one end of the fifth resistor R5, and the other end of the fifteenth resistor R15 is connected to the ground.

[0018] Specifically, the control unit also includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a sixteenth resistor R16, a third thyristor U3, a fifth thyristor U5, a seventh AND gate U7, a first MOS tube Q1, a second transistor Q2, a third transistor Q3, a first diode D1, and a second diode D2. The output end of the seventh AND gate U7 is connected to the second connector P2, the first input end of the seventh AND gate U7 is connected to one end of the sixteenth resistor R16 and the cathode of the fifth thyristor U5, the second input end of the seventh AND gate U7 is connected to one end of the twelfth resistor R12 and the cathode of the third thyristor U3, the control electrode of the third thyristor U3 is connected to one end of the thirteenth resistor R13 and the emitter of the second transistor Q2, the base of the second transistor Q2 is connected to the cathode of the first diode D1, and the first diode The anode of the transistor D1 is connected to the anode of the second diode D2 and the output end of the first operational amplifier U1, the collector of the second triode Q2, the collector of the third triode Q3, and one end of the eleventh resistor R11 are connected to the power supply, the base of the third triode Q3 is connected to the input end of the eighth inverter U8, the emitter of the third triode Q3 is connected to the anode of the third thyristor U3 and the anode of the fifth thyristor U5, the control electrode of the fifth thyristor U5 is connected to one end of the tenth resistor R10 and the drain of the first MOS tube Q1, the gate of the first MOS tube Q1 is connected to the cathode of the second diode D2, the source of the first MOS tube Q1 is connected to the other end of the eleventh resistor R11 and one end of the fourteenth resistor R14, the other end of the tenth resistor R10, the other end of the twelfth resistor R12, the other end of the thirteenth resistor R13, the other end of the fourteenth resistor R14, the other end of the sixteenth resistor R16 and the ground are connected.

[0019] Specifically, the control unit also includes a first resistor R1, a second resistor R2, a sixth resistor R6, and a second voltage stabilizing chip U2. One end of the first resistor R1 is connected to a power supply, the other end of the first resistor R1 is connected to one end of the sixth resistor R6 and the cathode of the second voltage stabilizing chip U2, the other end of the sixth resistor R6 is connected to the in-phase end of the first operational amplifier U1, the control electrode of the second voltage stabilizing chip U2, and one end of the second resistor R2, and the other end of the second resistor R2, the anode of the second voltage stabilizing chip U2 and the ground end are connected.

[0020] Specifically, the control unit also includes a fourth transistor Q4 and a third connector P3, the base of the fourth transistor Q4 is connected to the third connector P3, the collector of the fourth transistor Q4 is connected to the first pin of the sixth trigger U6, and the emitter of the fourth transistor Q4 is connected to the ground terminal.

[0021] Specifically, the control unit further includes a ninth resistor R9, one end of the ninth resistor R9 is connected to the gate of the first MOS transistor Q1, and the other end of the ninth resistor R9 is connected to the ground.

[0022] Specifically, it also includes an indicating unit, which is composed of a light emitting diode or a buzzer. The signal is input through the seventh pin of the fourth digital potentiometer U4 to indicate the current adjustment state.

[0023] In this embodiment, it is considered that the supply current decreases as the battery power decreases with use. In the initial state, the positive electrode of BAT is input to the third pin and the fifth pin of the fourth digital potentiometer U4 through the third resistor R3, and the first connector P1 is powered in series. The load is connected to the first connector P1. At the same time, the seventh resistor R7 and the eighth resistor R8 are used to limit the current and sample the power supply signal and feed it back to the inverting end of the first operational amplifier U1. In this embodiment, the first operational amplifier U1 in-phase end provides a reference signal through the power supply. The output end of the first operational amplifier U1 outputs a control signal, which is pulled up by the fourth resistor R4 and then fed back to the second pin of the fourth digital potentiometer U4, so that the fourth digital potentiometer U4 is connected in parallel with the load of the first connector P1. When the BAT power decreases and causes the supply current of the first connector P1 to decrease, the first operational amplifier U1 outputs a signal to adjust the resistance value of the fourth digital potentiometer U4 to change the shunt ratio so that the supply current of the first connector P1 remains the same, thereby preventing the supply current from decreasing. In addition to being provided by the power supply, the reference signal of the first operational amplifier U1 can also be provided by the sixth resistor R6 and the second resistor R2 is used for voltage division setting, and the first resistor R1 is current limited and then stabilized by the second voltage stabilizing chip U2 before being input to the sixth resistor R6; in this embodiment, it is considered that if the detection frequency is too high during the power supply of the battery pack, the power consumption will increase. Therefore, a pulse signal is input through the second connector P2 to control the frequency of detection and adjustment. In the initial state, the sixth trigger U6 and the six-pin output are fed back to the second pin of the sixth trigger U6. When the signal input by the second connector P2 is at the rising edge and fed back to the third pin of the sixth trigger U6, the input exists at the second pin of the sixth trigger U6, so that the fifth pin of the sixth trigger U6 is output, and the sixth pin of the sixth trigger U6 is cut off, and the second pin of the sixth trigger U6 jumps. At the same time, the eighth inverter U8 outputs an inverted signal to the seventh pin of the fourth digital potentiometer U4, and the fourth digital potentiometer U4 is adjusted. After the falling edge of the second connector P2, the fifth pin output of the sixth trigger U6 is locked. When the second connector P2 inputs a rising edge signal again, there is no input after the second pin of the sixth trigger U6 jumps, so the fifth pin of the sixth trigger U6 is cut off. The sixth pin of the sixth trigger U6 outputs, the second pin of the sixth trigger U6 jumps again, the signal of the fifth pin of the sixth trigger U6 is input to the eighth inverter U8 to turn off the fourth digital potentiometer U4, so as to complete the frequency control of the fixed-point detection through the duty cycle of the pulse signal input by the second connector P2, and the third connector P3 is used to input the sleep signal. When the third connector P3 inputs the signal, the fourth transistor Q4 is turned on, the sixth trigger U6 is set so that the fifth pin of the sixth trigger U6 has no output, and the eighth inverter U8 outputs a signal to turn off the fourth digital potentiometer U4;In this embodiment, it is considered that the frequency of adjustment through duty cycle control will be fixed due to the consistency of the adjusted bandwidth, that is, no matter whether the power supply current of the first connector P1 is in a decreasing state, real-time adjustment is still performed within a certain pulse width. Therefore, in order to further reduce the power consumption of the fixed-point detection, the duty cycle signal input by the second connector P2 is removed, and the signal input by the second connector P2 is changed to a single pulse signal. When the second connector P2 is input, if the first operational amplifier U1 is in an output state, the signal is fed back to the second transistor Q2 through the first diode D1, and the second transistor Q2 is turned on. The other signal is input to the gate of the first MOS tube Q1 through the second diode D2, and the first MOS tube Q1 is turned off. The collector power supply signal of the second transistor Q2 is fed back to the control electrode of the third thyristor U3 after passing through the second transistor Q2 and the thirteenth resistor R13 loop. After the second connector P2 is input, the five-pin output of the sixth trigger U6 turns on the third transistor Q3. The collector power supply signal of the third transistor Q3 passes through the third transistor Q3, the third thyristor U3, and the twelfth resistor R13. The first operational amplifier U1 is turned off and output, the first MOS tube Q1 is turned on, the power signal at the eleventh resistor R11 is input to the control electrode of the fifth thyristor U5 after passing through the first MOS tube Q1 and the tenth resistor R10 loop, the collector power signal of the third transistor Q3 is input to the seventh AND gate U7 after passing through the third transistor Q3, the fifth thyristor U5 and the sixteenth resistor R16 loop, the output of the seventh AND gate U7 is fed back to the third pin of the sixth trigger U6 to make the second pin of the sixth trigger U6 jump, the fifth pin of the sixth trigger U6 has no output, the third transistor Q3 is turned off to reset and stop the fourth digital potentiometer U4 from adjusting, so that the second connector P2 inputs a signal and controls the cut-off of the fourth digital potentiometer U4 according to the actual required adjustment time, and waits for the second connector P2 to input a signal again, so as to control the adjustment state of the fourth digital potentiometer U4 according to the actual adjustment time; and the ninth resistor R9 is used for the gate loop of the first MOS tube Q1 to increase the response speed of the first MOS tube Q1. ;

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A mobile power supply control circuit, characterized in that: A control unit is included, wherein the control unit includes a third resistor, a fourth resistor, a fifth resistor, a seventh resistor, an eighth resistor, a fourth digital potentiometer, and a first connector, wherein one end of the third resistor, a first pin of the fourth digital potentiometer, and a power supply are connected, the other end of the third resistor is connected to one end of the seventh resistor, the third pin of the fourth digital potentiometer, the fifth pin of the fourth digital potentiometer, and the first connector, the other end of the seventh resistor is connected to one end of the eighth resistor and an inverting end of a first operational amplifier, the seventh pin of the fourth digital potentiometer is connected to one end of the fifth resistor, the second pin of the fourth digital potentiometer is connected to one end of the fourth resistor and an output end of the first operational amplifier, and the other end of the fifth resistor, the other end of the fourth resistor, the other end of the eighth resistor, the sixth pin of the fourth digital potentiometer, and a ground terminal are connected; The control unit also includes a fifteenth resistor, a seventeenth resistor, a sixth trigger, an eighth inverter, and a second connector. One end of the seventeenth resistor and the fourth pin of the sixth trigger are connected to the power supply. The other end of the seventeenth resistor is connected to the first pin of the sixth trigger. The second pin of the sixth trigger is connected to the sixth pin of the sixth trigger. The third pin of the sixth trigger is connected to one end of the fifteenth resistor and the second connector. The fifth pin of the sixth trigger is connected to the input end of the eighth inverter. The output end of the eighth inverter is connected to one end of the fifth resistor. The other end of the fifteenth resistor is connected to the ground. The control unit also includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a sixteenth resistor, a third thyristor, a fifth thyristor, a seventh AND gate, a first MOS tube, a second transistor, a third transistor, a first diode, and a second diode. The output end of the seventh AND gate is connected to the second connector. The first input end of the seventh AND gate is connected to one end of the sixteenth resistor. , the cathode of the fifth thyristor is connected, the second input terminal of the seventh AND gate is connected to one end of the twelfth resistor and the cathode of the third thyristor, the control electrode of the third thyristor is connected to one end of the thirteenth resistor and the emitter of the second triode, the base of the second triode is connected to the cathode of the first diode, the anode of the first diode is connected to the anode of the second diode and the output terminal of the first operational amplifier, the collector of the second triode, the collector of the third triode, one end of the eleventh resistor and the power supply are connected, the base of the third triode is connected to the input terminal of the eighth inverter, the emitter of the third triode is connected to the anode of the third thyristor and the anode of the fifth thyristor, the control electrode of the fifth thyristor is connected to one end of the tenth resistor and the drain of the first MOS tube, the gate of the first MOS tube is connected to the cathode of the second diode, the source of the first MOS tube is connected to the other end of the eleventh resistor and one end of the fourteenth resistor, the other end of the tenth resistor, the other end of the twelfth resistor, the other end of the thirteenth resistor, the other end of the fourteenth resistor, the other end of the sixteenth resistor and the ground terminal are connected.

2. The mobile power supply control circuit according to claim 1, characterized in that: The control unit also includes a first resistor, a second resistor, a sixth resistor, and a second voltage stabilizing chip. One end of the first resistor is connected to a power supply, the other end of the first resistor is connected to one end of the sixth resistor and a cathode of the second voltage stabilizing chip, the other end of the sixth resistor is connected to the in-phase end of the first operational amplifier, the control electrode of the second voltage stabilizing chip, and one end of the second resistor, and the other end of the second resistor, an anode of the second voltage stabilizing chip, and a ground terminal are connected.

3. The mobile power supply control circuit according to claim 1, characterized in that: The control unit also includes a fourth transistor and a third connector. The base of the fourth transistor is connected to the third connector, the collector of the fourth transistor is connected to the first pin of the sixth trigger, and the emitter of the fourth transistor is connected to the ground terminal.

4. The mobile power supply control circuit according to claim 1, characterized in that: The control unit also includes a ninth resistor, one end of the ninth resistor is connected to the gate of the first MOS tube, and the other end of the ninth resistor is connected to the ground end.

5. The mobile power supply control circuit according to claim 1, characterized in that: It also includes an indicating unit, which is composed of a light emitting diode or a buzzer. The signal is input from the seventh pin of the fourth digital potentiometer to indicate the current adjustment state.

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