Low-power-consumption control system with charging circuit

Abstract

The utility model provides a low-power-consumption control system with a charging circuit. The low-power-consumption control system comprises a switching power supply, a controller and the charging circuit. The switching power supply is provided with a first output end and a second output end; the controller is connected with the switching power supply and comprises a direct-current output control circuit and a detection circuit, the direct-current output control circuit is connected with the switching power supply, the detection circuit is connected with the direct-current output control circuit and used for detecting whether a voltage signal is input or not, the detection circuit comprises an MCU, and the MCU is connected with the direct-current output control circuit; the charging circuit is connected with the direct current output control circuit; the controller has a first state and a second state, the charging circuit is connected with the controller, the detection circuit is conducted, when the controller is in the first state, the first output end outputs high-voltage current to the direct-current output control circuit, and when the controller is in the second state, the second output end outputs low-voltage current to the direct-current output control circuit. According to the utility model, the problem of large standby power consumption of the control system in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of charging systems, and more specifically, to a low-power control system with a charging circuit. Background Art

[0002] In the prior art, a low-power control system for charging often achieves the purpose of reducing system power consumption by directly turning off the 33V output. However, this also causes the system to be unable to detect in real time whether a charging interface is connected. In the prior art, when the system is on standby, it still maintains a 33V high-voltage output to keep the detection circuit working, resulting in a problem of excessive power consumption. Summary of the Utility Model

[0003] The utility model solves the problem of high standby power consumption of the low-power control system in the prior art.

[0004] To solve the above problems, the utility model provides a low-power control system with a charging circuit, including a switching power supply, a controller, and a charging circuit. The controller is connected to the switching power supply. The controller includes a DC output control circuit and a detection circuit. The DC output control circuit is connected to the switching power supply, and the detection circuit is connected to the DC output control circuit for detecting whether a voltage signal is input. The detection circuit includes an MCU, and the MCU is connected to the DC output control circuit. The charging circuit is connected to the controller. Wherein the controller has a first state and a second state. When the controller is in the first state or the second state, the charging circuit is connected to the controller, the detection circuit is turned on, and the DC output control circuit is turned on. When the controller is in the first state, current flows through the first output terminal to the DC output control circuit, and the first output terminal is a high-voltage output terminal. When the controller is in the second state, current flows through the second output terminal to the DC output control circuit, and the second output terminal is a low-voltage output terminal.

[0005] Compared with the prior art, the technical effects achieved by this technical solution are as follows: The switching power supply provides the lowest voltage required for the controller during standby. When an external charging device is not connected to the charging circuit, the detection current in the controller is small, and the controller maintains a low-voltage standby state, thereby enabling the detection circuit to maintain a real-time detection state. When an external charging device is connected to the charging circuit, the detection circuit detects that the input voltage is higher than the threshold signal, and the controller enables the switching power supply to output a high voltage and outputs a high voltage to the charging circuit to ensure fast charging of the system. This solution powers the system with a low voltage during system standby, which can reduce the power consumption of the system during standby.

[0006] Further, the DC output control circuit includes a switching circuit. The switching circuit is provided with a first port, a second port, and a third port. The detection circuit is provided with a first pin. The first port is connected to the first output terminal, the second port is connected to the charging circuit, and the MCU is connected to the third port through the first pin.

[0007] Compared with the prior art, the technical effects achieved by this technical solution are as follows: The MCU realizes the signal input function for the switching circuit. The switching circuit conducts or turns off according to the input signal, thereby controlling the state of the controller. When the controller is in the first state, the current flows from the first output terminal of the switching power supply to the DC output control circuit to supply power to the charging circuit; when the controller is in the second state, the current flows from the second output terminal of the switching power supply to the DC output control circuit to supply power to the charging circuit.

[0008] Further, the detection circuit is provided with a second pin. The MCU is connected to the DC output control circuit through the second pin.

[0009] Compared with the prior art, the technical effects achieved by this technical solution are as follows: The voltage signal when the charging circuit is connected can be input into the MCU.

[0010] Further, the DC output control circuit further includes a first current-limiting resistor. The first current-limiting resistor is connected in series with the third port of the switching circuit.

[0011] Compared with the prior art, the technical effects achieved by this technical solution are as follows: Detect the magnitude of the current to realize whether to turn on the high-voltage output.

[0012] Further, the DC output control circuit is further provided with a connection port. The charging circuit is connected to the DC output control circuit through the connection port and is connected to the output terminal of the switching power supply.

[0013] Compared with the prior art, the technical effects achieved by this technical solution are as follows: Realize the connection between the charging circuit and the DC output control circuit, and input the voltage signal of the charging circuit into the MCU.

[0014] Further, the DC output control circuit further includes a triode and a second current-limiting resistor. The triode is arranged between the first pin and the switching circuit; the second current-limiting resistor is connected in series with the base of the triode.

[0015] Compared with the prior art, the technical effects achieved by this technical solution are as follows: Use the triode to build a logic circuit to ensure that there is a high level input to the gate of the switching circuit when the charging circuit is connected. The second current-limiting resistor is used to limit and reduce the base current of the triode to prevent the triode from being broken down.

[0016] Further, the DC output control circuit further includes a voltage-dividing resistor, and the voltage-dividing resistor is connected in parallel between the base and the emitter of the triode.

[0017] Compared with the prior art, the technical effects achieved by this technical solution are as follows: When the base level is uncertain, the base potential is reduced by voltage division, preventing the mis-conduction of the triode caused by unstable input level signals during the power-on initialization of the MCU, and ensuring the stable operation of the triode. At the same time, when the triode is cut off, it can discharge through the voltage-dividing resistor, realizing the rapid turn-off of the triode.

[0018] Further, the charging circuit includes a protocol chip and a power management chip. The protocol chip is used to identify the device charging protocol and output the voltage signal, and the power management chip is communicatively connected to the protocol chip.

[0019] Compared with the prior art, the technical effects achieved by this technical solution are as follows: The power management chip outputs a corresponding voltage signal according to the charging protocol of the connected system by the protocol chip, which is fed back to the power management chip and then converted into the charging voltage of the external device protocol through step-down rectification.

[0020] Further, the charging circuit further includes a filter capacitor, and at least one filter capacitor is connected between the input pin of the power management chip and the ground wire.

[0021] Compared with the prior art, the technical effects achieved by this technical solution are as follows: Filter out low-frequency or high-frequency interference, and keep the voltage input to the power management chip stable.

[0022] Further, the charging circuit further includes an inductor, and the inductor is connected in series with the output pin of the power management chip. Description of the Drawings

[0023] Figure 1 It is a structural block diagram of a low-power control system with a charging circuit provided by this application;

[0024] Figure 2 It is a circuit diagram of the DC output control circuit;

[0025] Figure 3 It is an enlarged view A of the switch circuit;

[0026] Figure 4 It is a circuit diagram of the detection circuit;

[0027] Figure 5 It is a circuit diagram of the charging circuit.

[0028] Description of the Reference Numerals:

[0029] 1 - Low-power control system with a charging circuit; 2 - Switching power supply; 3 - Controller; 31 - DC output control circuit; 32 - Detection circuit; 4 - Charging circuit. Detailed Description of the Invention

[0030] The purpose of the present utility model is to provide a low-power control system with a charging circuit, which is used to achieve the effect of reducing the standby power consumption of the system.

[0031] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings.

[0032] As Figure 1 and Figure 4 shown, the present utility model provides a low-power control system 1 with a charging circuit, which includes a switching power supply 2, a controller 3 and a charging circuit 4. The controller 3 is connected to the switching power supply 2. The controller 3 includes a DC output control circuit 31 and a detection circuit 32. The DC output control circuit 31 is connected to the switching power supply 2. The detection circuit 32 is communicatively connected to the DC output control circuit 31 and is used to detect the magnitude of the input voltage signal. The detection circuit 32 includes an MCU U1, and the MCU U1 is communicatively connected to the DC output control circuit 31. The charging circuit 4 is communicatively connected to the controller 3. Among them, the controller 3 has a first state and a second state; when the controller 3 is in the first state, the current flows from the first output terminal of the switching power supply to the DC output control circuit to supply power to the charging circuit; when the controller is in the second state, the current flows from the second output terminal of the switching power supply to the DC output control circuit to supply power to the charging circuit.

[0033] The switching power supply 2 provides the lowest voltage required during standby for the controller 3. When there is no external charging device connected to the charging circuit, the power supply of the DC output control circuit 31 in the controller 3 is supplied by the low voltage of the switching power supply, and the controller 3 maintains a low-voltage standby state, thereby enabling the detection circuit 32 to maintain a real-time detection state; when an external charging device is connected to the charging circuit, the detection circuit 32 detects an increase in the input voltage signal, and the controller turns on the high voltage of the switching power supply to output a high voltage for normal charging to the system.

[0034] As Figure 2 and Figure 3 shown, the switching power supply 2 is provided with a first output terminal CN5 and a second output terminal CN4. The DC output control circuit 31 includes a switching circuit. In this embodiment, the switching circuit is specifically a PMOS transistor. The detection circuit 32 is provided with a first pin PD4. The source electrode of the MOS transistor Q17 is connected to the first output terminal CN5, and the drain electrode of the MOS transistor Q17 is connected to the charging circuit; the MCU U1 is connected to the gate electrode of the MOS transistor Q17 through the first pin PD4.

[0035] Specifically, in this embodiment, the voltage of the first output terminal CN5 is 33V, and the voltage of the second output terminal CN4 is 5.7V. When the controller 3 is in the second state, the second output terminal CN4 supplies power to the controller 3 at a voltage of 5.7V to maintain the standby state.

[0036] Implement the signal input function of the MCU U1 to the MOS transistor Q17. The switching power supply 2 is provided with two output terminals. The first output terminal CN5 outputs a high level, and the second output terminal CN4 outputs a low level. In the first state, the MCU U1 does not detect the input of a voltage signal. The controller 3 relies on the low-level input of the second output terminal CN4 for power supply to maintain the standby state and ensure the operation of the detection circuit 32.

[0037] As Figure 2 and Figure 4 shown, the detection circuit 32 is provided with a second pin PD5. The MCU U1 is connected to the OUT-ADC terminal of the DC output control circuit 31 through the second pin PD5.

[0038] In this embodiment, the MCU U1 is further provided with a pin PD6 connected to the EN2 terminal of the switching power supply.

[0039] Specifically, when an external charging device is connected to USB1 in the charging circuit 4, the first pin PD6 conducts. When no external charging device is connected to USB1 in the charging circuit 4, the first pin PD6 is open.

[0040] Enable the voltage signal when the charging circuit 4 is connected to be input into the MCU U1.

[0041] The DC output control circuit 31 further includes a first current-limiting resistor R57. The first current-limiting resistor R57 is connected in series with the gate of the MOS transistor Q17.

[0042] It is used to detect the magnitude of the current to realize whether to turn on the high-voltage output. The DC output control circuit 31 is further provided with a connection port CN3. The charging circuit 4 is connected to the DC output control circuit 31 through the connection port CN3 and is connected to the output terminal of the switching power supply.

[0043] At least one resistor R81 is connected in series between the second pin PD5 and the connection port OUT-ADC of the DC output control circuit 31, which is used to limit the current flowing into the MCU U1 to prevent the MCU U1 from being damaged due to excessive current at the moment when the charging circuit 4 is connected. There is also a capacitor C45 connected in parallel with the resistor R81, which is used to filter high-frequency interference.

[0044] Realize the connection between the charging circuit 4 and the DC output control circuit 31, and input the voltage signal of the charging circuit 4 into the MCU U1.

[0045] Refer to again Figure 2 , the DC output control circuit 31 further includes a triode Q1 and a second current-limiting resistor R1. The second current-limiting resistor R1 is connected in series with the base of the triode Q1. The second current-limiting resistor R1 is used to limit and reduce the base current of the triode Q1 to prevent the triode Q1 from being broken down.

[0046] Specifically, the triode Q1 is an NPN triode.

[0047] In this embodiment, there is also a triode Q18, and the triode Q18 is a PNP triode. The base of the triode Q18 is connected in series with the collector of the triode Q1, and a resistor R64 is connected in series to the base of the triode Q18. The collector of the triode Q18 is connected to the gate of the MOS transistor Q17.

[0048] When the controller 3 is in the first state, the triode Q1 is cut off and the triode Q18 is turned on. When the controller 3 is in the second state, the triode Q1 is turned on and the triode Q18 is cut off.

[0049] A logic circuit is built using the triode Q1 and the triode Q18 to ensure that a high level is input to the gate of the MOS transistor Q17 when the charging circuit 4 is connected.

[0050] The DC output control circuit 31 further includes a voltage-dividing resistor R2, and the voltage-dividing resistor R2 is connected in parallel between the base and the emitter of the triode Q1.

[0051] When the base level of the triode Q1 is uncertain, the voltage-dividing resistor R2 divides the voltage to reduce the base potential, preventing the triode Q1 from being mis-conducted due to unstable input level signals during the power-on initialization of the MCU U1, and ensuring the stable operation of the triode Q1. At the same time, when the triode Q1 is cut off, it can discharge through the voltage-dividing resistor R2 to achieve the fast turn-off of the triode Q1.

[0052] As Figure 5 shown, the charging circuit 4 includes a protocol chip FP1 and a power management chip U2. The protocol chip FP1 is used to identify the device charging protocol and output the voltage signal, and the power management chip U2 is communicatively connected to the protocol chip FP1.

[0053] In this embodiment, the protocol chip FP1 is specifically FP6601, and the power management chip U2 is specifically CX8835.

[0054] The power management chip U2 outputs a corresponding voltage signal according to the charging protocol of the connected system by the protocol chip FP1, which is fed back to the power management chip U2 and then converted into the charging voltage of the external device protocol through step-down rectification.

[0055] The charging circuit 4 further includes a filter capacitor C1, and at least one filter capacitor C1 is connected between the input pin of the power management chip U2 and the ground wire.

[0056] The filter capacitor C1 is specifically an electrolytic capacitor.

[0057] A capacitor C3 is also connected between the input pin of the power management chip U2 and the ground wire to assist the filter capacitor C1 in filtering.

[0058] The filtering capacitor C1 is used to filter out low-frequency or high-frequency interference, so as to keep the voltage of the input power management chip U2 stable.

[0059] The charging circuit further includes an inductor, and the inductor is connected in series with the output pin of the power management chip.

[0060] Although the present utility model is disclosed as above, the present utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the scope defined by the claims.

Claims

1. A low-power control system with a charging circuit, characterized in that, Comprising: A switching power supply having a first output terminal and a second output terminal; A controller connected to the switching power supply. The controller includes a DC output control circuit and a detection circuit. The DC output control circuit is connected to the switching power supply, and the detection circuit is connected to the DC output control circuit for detecting whether a voltage signal is input. The detection circuit includes an MCU, and the MCU is connected to the DC output control circuit; A charging circuit connected to the DC output control circuit; Wherein the controller has a first state and a second state. When the controller is in the first state or the second state, the charging circuit is connected to the controller, the detection circuit is turned on, and the DC output control circuit is turned on; When the controller is in the first state, current flows through the first output terminal to the DC output control circuit, and the first output terminal is a high-voltage output terminal; When the controller is in the second state, current flows through the second output terminal to the DC output control circuit, and the second output terminal is a low-voltage output terminal.

2. The low-power control system with a charging circuit according to claim 1, characterized in that The DC output control circuit includes a switching circuit having a first port, a second port, and a third port; The detection circuit has a first pin; The first port is connected to the first output terminal, and the second port is connected to the charging circuit; The MCU is connected to the third port through the first pin.

3. The low-power control system with a charging circuit according to claim 2, characterized in that The detection circuit has a second pin; The MCU is connected to the DC output control circuit through the second pin.

4. The low-power control system with a charging circuit according to claim 3, characterized in that The DC output control circuit further includes a first current-limiting resistor; The first current-limiting resistor is connected in series with the third port of the switching circuit.

5. The low-power control system with a charging circuit according to claim 2, characterized in that The DC output control circuit further has a connection port that communicates with the charging circuit.

6. The low-power control system with a charging circuit according to claim 5, characterized in that The DC output control circuit further includes a triode and a second current-limiting resistor; The triode is disposed between the first pin and the switching circuit; The second current-limiting resistor is connected in series with the base of the triode.

7. The low-power control system with a charging circuit according to claim 6, characterized in that The DC output control circuit further includes a voltage-dividing resistor; The voltage-dividing resistor is connected in parallel between the base and the emitter of the triode.

8. The low-power control system with a charging circuit according to any one of claims 1 to 7, characterized in that The charging circuit includes: A protocol chip for identifying the device charging protocol and outputting the voltage signal; A power management chip communicatively connected to the protocol chip.

9. The low-power control system with a charging circuit according to claim 8, wherein The charging circuit further includes: Filter capacitors, and at least one filter capacitor is connected between the input pin of the power management chip and the ground wire.

10. The low-power control system with a charging circuit according to claim 9, wherein the charging circuit further includes an inductor; the inductor is connected in series with the output pin of the power management chip.

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