Power management circuit

Abstract

The utility model discloses a power supply management circuit, which comprises a battery management module and a master control module, the battery management module comprises an energy storage battery, a first controller, a wake-up circuit and an isolation circuit, the master control module comprises a second controller, a switch circuit and a grounding end, one end of the switch circuit is connected with the energy storage battery, and the other end of the switch circuit is connected with the isolation circuit. One end of the switch circuit is electrically connected with the first controller, the other end of the switch circuit is electrically connected with the input end of the wake-up circuit and the second controller, the output end of the wake-up circuit is connected with the first controller, the second controller is electrically connected with the grounding end, and the energy storage battery, the isolation circuit and the grounding end are sequentially connected. Therefore, the isolating circuit isolates the energy storage battery from the grounding end. The power management circuit provided by the utility model is high in reliability, and can reduce the risks of short circuit and damage caused by overcurrent of the battery management circuit when the switching circuit is conducted.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage power supply, in particular to a power supply management circuit. Background Art

[0002] In recent years, outdoor camping activities have become widely popular among people, and the popularity of portable power supplies for powering electronic devices or electrical appliances outdoors has also increased. Existing portable power supplies need to wake up the main control module through a switch button when in use, among which, a portable power supply that does not electrically control the main control module needs to wake up the battery management module first. However, since the main control module and the battery management module of the portable power supply are not co-located, in order to wake up the battery management module first, the negative pole of the energy storage battery needs to be led to the battery management module. This portable power supply that does not electrically control the main control module may have the problem of excessive wake-up signal current when pressing the switch button, resulting in the risk of short circuit and damage to the battery management module. Therefore, the reliability of the power management circuit of the existing portable power supply is low. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a power management circuit to solve the problem that the battery management module is easily short-circuited and damaged when the switch button of the existing power management circuit is pressed.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a power management circuit, which includes a battery management module and a main control module, the battery management module includes an energy storage battery, a first controller, a wake-up circuit and an isolation circuit, the main control module includes a second controller, a switch circuit and a ground terminal, one end of the switch circuit is connected to the energy storage battery, the other end of the switch circuit is electrically connected to the input end of the wake-up circuit and the second controller respectively, the output end of the wake-up circuit is connected to the first controller, the second controller is electrically connected to the ground terminal, the energy storage battery, the isolation circuit and the ground terminal are connected in sequence, so that the isolation circuit isolates the energy storage battery from the ground terminal.

[0005] Furthermore, the wake-up circuit includes a first resistor, a second resistor and a first transistor, one end of the first resistor is electrically connected to the switching circuit, the other end of the first resistor is electrically connected to the base of the first transistor, one end of the second resistor is connected to the base of the first transistor, the other end of the second resistor is electrically connected to the emitter of the first transistor, and the emitter of the first transistor is electrically connected to the energy storage battery.

[0006] Furthermore, the wake-up circuit also includes a third resistor, and the third resistor is electrically connected to the collector of the first transistor.

[0007] Furthermore, the isolation circuit includes a first NMOS tube and a second NMOS tube, the drain of the first NMOS tube is electrically connected to the drain of the second NMOS tube, the source of the first NMOS tube is electrically connected to the energy storage battery, and the source of the second NMOS tube is electrically connected to the ground terminal.

[0008] Furthermore, it also includes a key signal detection circuit, the input end of the key signal detection circuit is connected to the switch circuit, and the output end of the key signal detection circuit is connected to the second controller.

[0009] Furthermore, the key signal detection circuit includes a fourth resistor, a fifth resistor and a second transistor, one end of the fourth resistor is electrically connected to the switching circuit, the other end of the fourth resistor is electrically connected to the base of the second transistor, one end of the fifth resistor is electrically connected to the base of the second transistor, the other end of the fifth resistor is electrically connected to the emitter of the second transistor, and the emitter of the second transistor is electrically connected to the ground terminal and the isolation circuit respectively.

[0010] Furthermore, the key signal detection circuit also includes a diode, an anode of the diode is electrically connected to the switch circuit, and a cathode of the diode is electrically connected to the fourth resistor.

[0011] Furthermore, the key signal detection circuit also includes a sixth resistor, and the sixth resistor is electrically connected to the collector of the second transistor.

[0012] Furthermore, the switching circuit includes a seventh resistor, a switch button and a voltage regulator tube connected in series in sequence, the seventh resistor is electrically connected to the energy storage battery, the anode of the voltage regulator tube is electrically connected to the wake-up circuit and the second controller respectively, and the cathode of the voltage regulator tube is electrically connected to the switch button.

[0013] Furthermore, the main control module also includes a DC converter, an input end of the DC converter is electrically connected to the energy storage battery, and an output end of the DC converter is electrically connected to the second controller.

[0014] The beneficial effects of the present invention are as follows: in the power management circuit described in the present invention, the battery management module receives the wake-up electrical signal generated by the switching circuit through the wake-up circuit, which can avoid the problem that the switching circuit generates excessive current and causes short circuit and damage to the battery management module; and the power management module is also provided with an isolation circuit to isolate the ground terminals of the battery management module and the main control module, and the main control module will only be turned on when the isolation circuit is turned on. Therefore, the power management circuit described in the present invention has higher reliability and low cost, and has good prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit schematic diagram of the power management circuit described in the utility model;

[0016] Description of labels:

[0017] 1. Battery management module;

[0018] 2. Main control module;

[0019] 3. Energy storage battery;

[0020] 4. The first controller;

[0021] 5. Wake-up circuit;

[0022] 6. Isolation circuit;

[0023] 7. Second controller;

[0024] 8. Switching circuit;

[0025] 9. Key signal detection circuit. DETAILED DESCRIPTION

[0026] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0027] Please refer to Figure 1 A power management circuit comprises a battery management module 1 and a main control module 2, wherein the battery management module 1 comprises an energy storage battery 3, a first controller 4, a wake-up circuit 5 and an isolation circuit 6, and the main control module 2 comprises a second controller 7, a switch circuit 8 and a ground terminal, wherein one end of the switch circuit 8 is connected to the energy storage battery 3, and the other end of the switch circuit 8 is electrically connected to the input end of the wake-up circuit 5 and the second controller 7 respectively, the output end of the wake-up circuit 5 is connected to the first controller 4, and the second controller 7 is electrically connected to the ground terminal, and the energy storage battery 3, the isolation circuit 6 and the ground terminal are connected in sequence so that the isolation circuit 6 isolates the energy storage battery 3 from the ground terminal.

[0028] The working principle of the utility model is briefly described as follows: In the power management circuit described in the utility model, the battery management module 1 detects the wake-up signal through the wake-up circuit 5. Specifically, the wake-up circuit 5 can reduce the voltage and current of the received wake-up electrical signal. Therefore, even if a large current is generated instantaneously when the switch circuit 8 is turned on, or even the wake-up circuit 5 is short-circuited to the energy storage battery 3, it will not cause damage to the battery management module 1; in addition, the ground terminals of the battery management module 1 and the main control module 2 are isolated by the isolation circuit 6. When the isolation circuit 6 is turned on, the main control module 2 is turned on and the second controller 7 can perform key signal detection.

[0029] From the above description, it can be seen that the beneficial effects of the utility model are: in the power management circuit described in the utility model, the battery management module 1 receives the wake-up electrical signal generated by the switch circuit 8 through the wake-up circuit 5, which can avoid the problem that the switch circuit 8 generates excessive current and causes short circuit and damage to the battery management module 1; and the power management module is also provided with an isolation circuit 6 to isolate the ground terminals of the battery management module 1 and the main control module 2. The main control module 2 will only be turned on when the isolation circuit 6 is turned on. Therefore, the power management circuit described in the utility model has higher reliability and low cost, and has good prospects for promotion and application.

[0030] Furthermore, the wake-up circuit 5 includes a first resistor R1, a second resistor R2 and a first transistor, one end of the first resistor R1 is electrically connected to the switching circuit 8, the other end of the first resistor R1 is electrically connected to the base of the first transistor Q3, one end of the second resistor R2 is connected to the base of the first transistor Q3, the other end of the second resistor R2 is electrically connected to the emitter of the first transistor Q3, and the emitter of the first transistor Q3 is connected to the energy storage battery 3.

[0031] From the above description, it can be seen that the first resistor R1 and the second resistor R2 can reduce the voltage and current of the wake-up electrical signal. When the switch circuit 8 is turned on, even if the wake-up electrical signal is equivalent to short-circuiting the energy storage battery 3 directly on the wake-up circuit 5, it will not cause damage to the battery management module 1.

[0032] Furthermore, the wake-up circuit 5 further includes a third resistor R3, and the third resistor R3 is electrically connected to the collector of the first transistor Q3.

[0033] Furthermore, the isolation circuit 6 includes a first NMOS tube Q1 and a second NMOS tube Q2, the drain of the first NMOS tube Q1 is electrically connected to the drain of the second NMOS tube Q2, the source of the first NMOS tube Q1 is electrically connected to the energy storage battery 3, and the source of the second NMOS tube Q2 is electrically connected to the ground terminal.

[0034] It can be seen from the above description that the first NMOS tube Q1 and the second NMOS tube Q2 act as switches, and the first NMOS tube Q1 and the second NMOS tube Q2 can isolate the energy storage battery 3 and the ground terminal; when the first NMOS tube Q1 and the second NMOS tube Q2 are both in the on state, the main control module 2 is turned on, so that the second controller 7 is powered on and works.

[0035] Furthermore, it also includes a key signal detection circuit 9 , the input end of the key signal detection circuit 9 is connected to the switch circuit 8 , and the output end of the key signal detection circuit 9 is connected to the second controller 7 .

[0036] Furthermore, the key signal detection circuit 9 includes a fourth resistor R4, a fifth resistor R5 and a second transistor Q4, one end of the fourth resistor R4 is electrically connected to the switching circuit 8, the other end of the fourth resistor R4 is electrically connected to the base of the second transistor Q4, one end of the fifth resistor R5 is electrically connected to the base of the second transistor Q4, the other end of the fifth resistor R5 is electrically connected to the emitter of the second transistor Q4, and the emitter of the second transistor Q4 is electrically connected to the ground terminal and the isolation circuit 6 respectively.

[0037] It can be seen from the above description that the fourth resistor R4 and the fifth resistor R5 can play a role in reducing the voltage and current of the received electrical signal.

[0038] Furthermore, the key signal detection circuit 9 further includes a diode D1 , an anode of the diode D1 is electrically connected to the switch circuit 8 , and a cathode of the diode D1 is electrically connected to the fourth resistor R4 .

[0039] It can be seen from the above description that the diode D1 can prevent backflow caused when the isolation circuit 6 is not turned on.

[0040] Furthermore, the key signal detection circuit 9 further includes a sixth resistor R6, and the sixth resistor R6 is electrically connected to the collector of the second transistor Q4.

[0041] Furthermore, the switching circuit 8 includes a seventh resistor R7, a switch button SW1 and a voltage regulator Z1 connected in series in sequence, the seventh resistor R7 is electrically connected to the energy storage battery 3, the anode of the voltage regulator Z1 is electrically connected to the wake-up circuit 5 and the second controller 7 respectively, and the cathode of the voltage regulator Z1 is electrically connected to the switch button SW1.

[0042] From the above description, it can be seen that the switch circuit 8 limits the current through the seventh resistor R7 and the Zener diode Z1, thereby protecting the switch button SW1 and preventing the two ends of the switch button SW1 from being damaged by high voltage. The withstand voltage of the Zener diode Z1 is close to the battery voltage, so the Zener diode Z1 can be used to withstand most voltages.

[0043] Furthermore, the main control module 2 also includes a DC converter, an input end of the DC converter is electrically connected to the energy storage battery 3 , and an output end of the DC converter is electrically connected to the second controller 7 .

[0044] Embodiment 1

[0045] Please refer to Figure 1 , Embodiment 1 of the present utility model is as follows: Embodiment 1 provides a power management circuit, which includes a battery management module 1 and a main control module 2, wherein the battery management module 1 includes an energy storage battery 3, a first controller 4, a wake-up circuit 5 and an isolation circuit 6, and the main control module 2 includes a second controller 7, a switch circuit 8 and a ground terminal, one end of the switch circuit 8 is connected to the energy storage battery 3, and the other end of the switch circuit 8 is electrically connected to the input end of the wake-up circuit 5 and the second controller 7 respectively, the switch circuit 8 can control the power management circuit to start, and generate a wake-up electrical signal for the wake-up circuit 5, the output end of the wake-up circuit 5 is connected to the first controller 4, the second controller 7 is electrically connected to the ground terminal, the energy storage battery 3, the isolation circuit 6 and the ground terminal are connected in sequence, so that the isolation circuit 6 isolates the energy storage battery 3 from the ground terminal.

[0046] In the first embodiment, the wake-up circuit 5 includes a first resistor R1, a second resistor R2, a third resistor R3 and a first transistor Q3, one end of the first resistor R1 is connected to the other end of the switch circuit 8, one end of the first resistor R1 is electrically connected to the other end of the switch circuit 8, the other end of the first resistor R1 is electrically connected to the base of the first transistor Q3, one end of the second resistor R2 is connected to the base of the first transistor Q3, the other end of the second resistor R2 is electrically connected to the emitter of the first transistor Q3, the emitter of the first transistor Q3 is electrically connected to the energy storage battery 3, and the third resistor R3 is electrically connected to the collector of the first transistor Q3.

[0047] Specifically, the first resistor R1 and the second resistor R2 are both large-value resistors, so that the first resistor R1 and the second resistor R2 can reduce the voltage and current of the wake-up electrical signal received by the wake-up circuit 5, and the first transistor Q3 can play the role of a switching transistor. In the process of turning on the switching circuit 8, even if the switching circuit 8 directly short-connects the energy storage battery 3 to the wake-up circuit 5, the first resistor R1 and the second resistor R2 can effectively avoid damage to the battery management module 1 through the voltage and current reduction effect.

[0048] In the first embodiment, the isolation circuit 6 includes a first NMOS transistor Q1 and a second NMOS transistor Q2, the drain of the first NMOS transistor Q1 is electrically connected to the drain of the second NMOS transistor Q2, the source of the first NMOS transistor Q1 is electrically connected to the energy storage battery 3, and the source of the second NMOS transistor Q2 is electrically connected to the ground terminal.

[0049] Among them, the first NMOS tube Q1 and the second NMOS tube Q2 play a switch role, and the first NMOS tube Q1 and the second NMOS tube Q2 can isolate the energy storage battery 3 and the ground terminal; when the first NMOS tube Q1 and the second NMOS tube Q2 are both in the on state, the main control module 2 can be turned on, so that the second controller 7 is powered on and the second controller 7 can detect the key signal.

[0050] In the first embodiment, the power management circuit also includes a key signal detection circuit 9, an input end of the key signal detection circuit 9 is connected to the switch circuit 8, and an output end of the key signal detection circuit 9 is connected to the second controller 7; specifically, the key signal detection circuit 9 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a diode D1 and a second triode Q4, an anode of the diode D1 is electrically connected to the switch circuit 8, a cathode of the diode D1 is electrically connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is electrically connected to the base of the second triode Q4, one end of the fifth resistor R5 is electrically connected to the base of the second triode Q4, the other end of the fifth resistor R5 is electrically connected to the emitter of the second triode Q4, the emitter of the second triode Q4 is electrically connected to the ground end and the source of the second NMOS tube Q2, respectively, and the sixth resistor R6 is electrically connected to the collector of the second triode Q4. Among them, since the battery management module 1 and the main control module 2 are not arranged in a common ground, the diode D1 can prevent the first NMOS transistor Q1 and the second NMOS transistor Q2 of the isolation circuit 6 from causing backflow when they are not turned on.

[0051] In the first embodiment, the switch circuit 8 includes a seventh resistor R7, a switch button SW1 and a voltage regulator Z1 connected in series in sequence, the seventh resistor R7 is electrically connected to the energy storage battery 3, the anode of the voltage regulator Z1 is electrically connected to the wake-up circuit 5 and the second controller 7 respectively, and the cathode of the voltage regulator Z1 is electrically connected to the switch button SW1. The switch circuit 8 performs current limiting through the seventh resistor R7 and the voltage regulator Z1, thereby protecting the switch button SW1 and preventing the switch button SW1 from being damaged due to high voltage at both ends, wherein the voltage withstand value of the voltage regulator Z1 is close to the battery voltage, so the voltage regulator Z1 can be used to withstand most voltages.

[0052] In the first embodiment, the main control module 2 further includes a DC converter, an input end of the DC converter is electrically connected to the energy storage battery 3 , and an output end of the DC converter is electrically connected to the second controller 7 .

[0053] To sum up, in the power management circuit described in the utility model, the battery management module 1 receives the wake-up electrical signal generated by the switch circuit 8 through the wake-up circuit 5, which can avoid the problem that the switch circuit 8 generates excessive current and causes short circuit and damage to the battery management module 1; and the power management module is also provided with an isolation circuit 6 to isolate the ground terminals of the battery management module 1 and the main control module 2. The main control module 2 will only be turned on when the isolation circuit 6 is turned on. Therefore, the power management circuit described in the utility model has higher reliability and low cost, and has good prospects for promotion and application.

[0054] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A power management circuit, characterized in that: It includes a battery management module and a main control module. The battery management module includes an energy storage battery, a first controller, a wake-up circuit and an isolation circuit. The main control module includes a second controller, a switch circuit and a ground terminal. One end of the switch circuit is connected to the energy storage battery, and the other end of the switch circuit is electrically connected to the input end of the wake-up circuit and the second controller respectively. The output end of the wake-up circuit is connected to the first controller, and the second controller is electrically connected to the ground terminal. The energy storage battery, the isolation circuit and the ground terminal are connected in sequence so that the isolation circuit isolates the energy storage battery from the ground terminal.

2. The power management circuit according to claim 1, characterized in that: The wake-up circuit includes a first resistor, a second resistor and a first transistor, one end of the first resistor is electrically connected to the other end of the switch circuit, the other end of the first resistor is electrically connected to the base of the first transistor, one end of the second resistor is connected to the base of the first transistor, the other end of the second resistor is electrically connected to the emitter of the first transistor, and the emitter of the first transistor is electrically connected to the energy storage battery.

3. The power management circuit according to claim 2, characterized in that: The wake-up circuit further includes a third resistor, and the third resistor is electrically connected to the collector of the first transistor.

4. The power management circuit according to claim 1, characterized in that: The isolation circuit includes a first NMOS tube and a second NMOS tube, the drain of the first NMOS tube is electrically connected to the drain of the second NMOS tube, the source of the first NMOS tube is electrically connected to the energy storage battery, and the source of the second NMOS tube is electrically connected to the ground terminal.

5. The power management circuit according to claim 1, characterized in that: It also includes a key signal detection circuit, the input end of the key signal detection circuit is connected to the switch circuit, and the output end of the key signal detection circuit is connected to the second controller.

6. The power management circuit according to claim 5, characterized in that: The key signal detection circuit includes a fourth resistor, a fifth resistor and a second transistor, one end of the fourth resistor is electrically connected to the switching circuit, the other end of the fourth resistor is electrically connected to the base of the second transistor, one end of the fifth resistor is electrically connected to the base of the second transistor, the other end of the fifth resistor is electrically connected to the emitter of the second transistor, and the emitter of the second transistor is electrically connected to the ground terminal and the isolation circuit respectively.

7. The power management circuit according to claim 6, characterized in that: The key signal detection circuit further includes a diode, an anode of the diode is electrically connected to the switch circuit, and a cathode of the diode is electrically connected to the fourth resistor.

8. The power management circuit according to claim 6, characterized in that: The key signal detection circuit further includes a sixth resistor, and the sixth resistor is electrically connected to the collector of the second transistor.

9. The power management circuit according to claim 1, characterized in that: The switching circuit includes a seventh resistor, a switch button and a voltage regulator tube connected in series in sequence, the seventh resistor is electrically connected to the energy storage battery, the anode of the voltage regulator tube is electrically connected to the wake-up circuit and the second controller respectively, and the cathode of the voltage regulator tube is electrically connected to the switch button.

10. The power management circuit according to claim 1, characterized in that: The main control module further includes a DC converter, an input end of the DC converter is electrically connected to the energy storage battery, and an output end of the DC converter is electrically connected to the second controller.

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