Multi-control type carbon dioxide detector power supply circuit

Abstract

The utility model discloses a multi-control type carbon dioxide detector power supply circuit which comprises a battery, a control chip, a wiring voltage direct input module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module and a voltage stabilizing module. The positive electrode of the battery is connected to the positive electrode of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct-in module, and the input end of the wiring voltage direct-in module is used for being connected to an external 5V power supply; the negative electrode of the first controllable switch module is connected to the positive electrode of the second controllable switch module, and the negative electrode of the second controllable switch module is a power supply output end. According to the multi-control type carbon dioxide detector power supply circuit, the problem that in the prior art, power cannot be supplied to a chip in multiple control modes after key pressing, automatic control and USB insertion is solved.

Description

Technical Field

[0001] The utility model relates to a power supply circuit, in particular to a multi-control type carbon dioxide detector power supply circuit. Background Art

[0002] The Chinese patent discloses an intelligent carbon dioxide sensor with multiple communication interfaces, application number: CN201520126958.5. The intelligent carbon dioxide sensor with multiple communication interfaces comprises a housing and a sensor circuit board and a processor circuit board arranged in the housing; wherein the sensor circuit board comprises: a carbon dioxide gas concentration sensor, a carbon dioxide gas concentration sensor application circuit, a light sensor, an air temperature and humidity sensor, a digital circuit power supply interface, and an analog circuit power supply interface; wherein the processor circuit board comprises: a microprocessor for connecting the carbon dioxide gas concentration sensor application circuit, the light sensor, and the air temperature and humidity sensor of the sensor circuit board to receive detection data; a data transmission module for data transmission, the data transmission module being connected to the microprocessor; and a power supply interface for power supply.

[0003] Although the intelligent carbon dioxide sensor with multiple communication interfaces can realize carbon dioxide detection, the intelligent carbon dioxide sensor with multiple communication interfaces still has the following disadvantages: although it can realize power supply during operation, it cannot power the control chip etc. through various control methods such as after button pressing, automatic control and USB insertion. Utility Model Content

[0004] The utility model provides a multi-control type carbon dioxide detector power supply circuit to solve the problem in the prior art that a chip cannot be powered by multiple control modes such as after a key is pressed, after automatic control and after a USB is inserted.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a multi-control type carbon dioxide detector power supply circuit, comprising: a battery, a control chip, a wiring voltage direct input module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module and a voltage stabilizing module; the positive pole of the battery is connected to the positive pole of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to an external 5V power supply; the negative pole of the first controllable switch module is connected to the positive pole of the second controllable switch module, and the negative pole of the second controllable switch module is the power supply output end; the positive pole of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form a plug-in output end, and the input end of the first current limiting module is used to connect to the output end after USB plug-in; the control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive pole of the third controllable switch module, and the output end of the third current limiting module is used to connect to the output end of the external key circuit; the negative pole of the third controllable switch module is grounded, and the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the signal output end of the control chip.

[0007] Preferably, the output end of the third current limiting module is connected to the output end of a fifth current limiting module, and the input end of the fifth current limiting module is connected to the signal input end of the control chip.

[0008] Preferably, the power supply output terminal is connected to the input terminal of the first buck-regulating module, and the output terminal of the first buck-regulating module is used to be connected to the voltage input terminal of the control chip.

[0009] Preferably, the power supply output terminal is connected to the input terminal of the second buck-stabilizing module, and the output terminal of the second buck-stabilizing module is used to be connected to the voltage input terminal of the carbon dioxide detection circuit.

[0010] Preferably, the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module and the fifth current limiting module all include: a current limiting diode, the anode of the current limiting diode is the input end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module, and the cathode of the current limiting diode is the output end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module.

[0011] Preferably, the wiring voltage direct input module includes: a resistor R1 and a resistor R2, one end of the resistor R1 is the input end of the wiring voltage direct input module, the other end of the resistor R1 is grounded through the resistor R2, and the connection between the resistor R1 and the resistor R2 is the output end of the wiring voltage direct input module.

[0012] Preferably, the first controllable switch module includes: a MOS tube Q1 and a capacitor C1, the gate of the MOS tube Q1 is the control end of the first controllable switch module, the drain of the MOS tube Q1 is the positive electrode of the first controllable switch module, the source of the MOS tube Q1 is the negative electrode of the first controllable switch module, the drain of the MOS tube Q1 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In the present application, the following functions are realized: first, when electricity is supplied from the wiring voltage direct input module, the MOS tube Q1 in the first controllable switch module is closed, and the input end of the wiring voltage direct input module is connected to the external 5V power supply, and the external 5v power supply is the power supply at the TYP-C interface. When there is power supply at the TYP-C interface, the MOS tube Q1 is closed, and the source of the MOS tube Q1 has a voltage output, thereby realizing that the positive pole of the second controllable switch module has a voltage input, thereby having the function of detecting whether the power supply at the TYP-C interface is normal. Second, when the external key circuit is pressed, the external key circuit outputs a low level. Since the control end of the second controllable switch module is connected to the positive electrode of the second controllable switch module through the load at the same time, the external key circuit needs to provide a low level to make the control end of the second controllable switch module have a lower voltage, so that the second controllable switch module is closed and powered on. When the second controllable switch module is powered on, the control chip starts to work, and the output end of the control chip outputs a high level. The control end of the third controllable switch module is connected to the driving voltage, and the third controllable switch module is closed and turned on. At this time, current flow conditions are provided for the load between the negative electrode of the second controllable switch module and the control end of the second controllable switch module, that is: the control end of the second controllable switch module is also connected to the low voltage, so that there is always a low voltage at the control end of the second controllable switch module. Even if the key in the external key circuit is disconnected, the second controllable switch module can always remain turned on under the control of the output end of the control chip. Third, when the output end of the control chip does not output a high level and when the key circuit does not output a low voltage, only when the USB is plugged into the TYP-C interface can the input end of the first current limiting module output a high voltage, so that the output end of the first current limiting module outputs a high level to the input end of the fourth current limiting module, the third controllable switch module is turned on, and the load between the control end and the negative electrode of the second controllable switch module can conduct current, thereby realizing automatic power supply after the USB is plugged in. Thus, a multi-control mode of automatic control after USB is plugged in, automatic control after the key in the key circuit is closed, and active control of the control chip is realized, and the first current limiting module, the second current limiting module, the third current limiting module, and the fourth current limiting module are arranged between each other to avoid interference between different control modes, and ensure that all controls can realize the output voltage of the control power supply output end.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Circuit diagram for powering circuit for multi-control CO2 detector. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods:

[0018] like Figure 1 As shown, the utility model discloses a multi-control type carbon dioxide detector power supply circuit, including: a battery, a control chip, a wiring voltage direct input module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module and a voltage stabilizing module; the positive electrode BATZ of the battery is connected to the positive electrode of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to an external 5V power supply TYPV; the negative electrode of the first controllable switch module is connected to the positive electrode of the second controllable switch module, and the negative electrode of the second controllable switch module is the power supply output end BATQB; The positive pole of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form the plug-in output end USBON, and the input end of the first current limiting module is used to connect to the USB plug-in output end USBV; the control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive pole of the third controllable switch module, and the output end of the third current limiting module is used to connect to the external key circuit output end KEYOUT; the negative pole of the third controllable switch module is grounded, and the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the signal output end BATEN of the control chip.

[0019] The output of the third current limiting module is connected to the output of a fifth current limiting module, and the input of the fifth current limiting module is connected to the signal input KEYIN of the control chip. The signal input KEYIN of the control chip is used to detect the output state of the key circuit to detect whether the key in the key circuit is closed.

[0020] The power supply output is connected to the input of the first buck regulator module, and the output of the first buck regulator module is used to connect to the voltage input of the control chip. The operating voltage of the control chip is 3.3v, but the voltage of the power supply output is not this voltage, and it is very likely to be 2.5v or other voltage values. Therefore, the first buck regulator module is designed to meet the operating voltage requirements of the control chip.

[0021] The power supply output is connected to the input of the second buck regulator module, and the output of the second buck regulator module is used to connect to the voltage input of the carbon dioxide detection circuit. The working voltage of the carbon dioxide detection circuit is 5V, but the voltage of the power supply output is not this voltage, and it is very likely to be 2.5V or other voltage values. Therefore, the second buck regulator module is designed to meet the working voltage requirements of the carbon dioxide detection circuit.

[0022] The first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module and the fifth current limiting module all include: a current limiting diode, the anode of the current limiting diode is the input end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module, and the cathode of the current limiting diode is the output end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module. The characteristic of the current limiting diode that the current can only flow from the anode to the cathode is utilized, so that there is no interference between the input voltages of various control modes.

[0023] The wiring voltage direct input module includes: resistor R1 and resistor R2, one end of resistor R1 is the input end of the wiring voltage direct input module, the other end of resistor R1 is grounded through resistor R2, and the connection between resistor R1 and resistor R2 is the output end of the wiring voltage direct input module. Resistors R1 and R2 have the function of voltage division, so that the voltage can meet the working requirements of MOS tube Q1 after connection.

[0024] The first controllable switch module includes: a MOS tube Q1 and a capacitor C1, wherein the gate of the MOS tube Q1 is the control end of the first controllable switch module, the drain of the MOS tube Q1 is the positive electrode of the first controllable switch module, the source of the MOS tube Q1 is the negative electrode of the first controllable switch module, the drain of the MOS tube Q1 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded. The capacitor C1 has the function of voltage stabilization.

[0025] The second controllable switch module includes: MOS tube Q2, capacitor C2, electrolytic capacitor C3 and resistor R8, the gate of MOS tube Q2 is the control end of the second controllable switch module, the drain of MOS tube Q2 is the positive electrode of the second controllable switch module, the source of MOS tube Q2 is the negative electrode of the second controllable switch module, the drain of MOS tube Q2 is connected to the positive electrode of capacitor C2, the negative electrode of capacitor C2 is grounded, the source of MOS tube Q2 is connected to the positive electrode of electrolytic capacitor C3, and the negative electrode of electrolytic capacitor C3 is grounded. Capacitor C1 and electrolytic capacitor C3 both have the function of voltage stabilization. Resistor R8 is the load between the negative electrode and the control end of the second controllable switch module.

[0026] The third controllable switch module includes: a transistor Q3 and a resistor R3, one end of the resistor R3 is the positive electrode of the third controllable switch module, the other end of the resistor R3 is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is the negative electrode of the third controllable switch module, and the base of the transistor Q3 is the control end of the third controllable switch module.

[0027] The cathode of the current limiting diode in the fifth current limiting module is connected to the output end of the third current limiting module through a resistor R7.

[0028] The anode of the current limiting diode in the fourth current limiting module is connected to one end of the resistor R6, and the other end of the resistor R6 is grounded.

[0029] The voltage stabilizing module includes: a resistor R4 and a resistor R5, one end of the resistor R4 is connected to the plug output terminal USBON, the other end of the resistor R4 is connected to the control end of the third controllable switch module and one end of the resistor R5, and the other end of the resistor R5 is grounded.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. The multi-control carbon dioxide detector power supply circuit is characterized in that: include: A battery, a control chip, a wiring voltage direct-in module, a first controllable switch module, a second controllable switch module, a third controllable switch module, a first current limiting module, a second current limiting module, a third current limiting module, a fourth current limiting module and a voltage stabilizing module; The positive electrode of the battery is connected to the positive electrode of the first controllable switch module, the control end of the first controllable switch module is connected to the output end of the wiring voltage direct input module, and the input end of the wiring voltage direct input module is used to connect to an external 5V power supply; The cathode of the first controllable switch module is connected to the anode of the second controllable switch module, and the cathode of the second controllable switch module is the power supply output terminal; The positive electrode of the second controllable switch module is connected to the output end of the second current limiting module, the input end of the second current limiting module is connected to the output end of the first current limiting module to form a plug-in output end, and the input end of the first current limiting module is used to connect to the output end after the USB plug-in; The control end of the second controllable switch module is connected to the input end of the third current limiting module and the positive electrode of the third controllable switch module, and the output end of the third current limiting module is used to connect to the output end of the external key circuit; The negative pole of the third controllable switch module is grounded, the controllable end of the third controllable switch module is connected to the plug-in output end and the output end of the fourth current limiting module through the voltage stabilizing module, and the input end of the fourth current limiting module is connected to the signal output end of the control chip.

2. The multi-control carbon dioxide detector power supply circuit according to claim 1, characterized in that: The output end of the third current limiting module is connected to the output end of a fifth current limiting module, and the input end of the fifth current limiting module is connected to the signal input end of the control chip.

3. The multi-control carbon dioxide detector power supply circuit according to claim 2, characterized in that: The power supply output end is connected to the input end of the first buck-voltage stabilizing module, and the output end of the first buck-voltage stabilizing module is used to connect to the voltage input end of the control chip.

4. The multi-control carbon dioxide detector power supply circuit according to claim 3, characterized in that: The power supply output end is connected to the input end of the second buck voltage stabilizing module, and the output end of the second buck voltage stabilizing module is used to be connected to the voltage input end of the carbon dioxide detection circuit.

5. The multi-control type carbon dioxide detector power supply circuit according to any one of claims 1 to 4, characterized in that: The first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module and the fifth current limiting module all include: a current limiting diode, the anode of the current limiting diode is the input end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module, and the cathode of the current limiting diode is the output end of the first current limiting module, the second current limiting module, the third current limiting module, the fourth current limiting module or the fifth current limiting module.

6. The multi-control carbon dioxide detector power supply circuit according to claim 5, characterized in that: The wiring voltage direct input module includes: a resistor R1 and a resistor R2, one end of the resistor R1 is the input end of the wiring voltage direct input module, the other end of the resistor R1 is grounded through the resistor R2, and the connection between the resistor R1 and the resistor R2 is the output end of the wiring voltage direct input module.

7. The multi-control carbon dioxide detector power supply circuit according to claim 6, characterized in that: The first controllable switch module includes: a MOS tube Q1 and a capacitor C1, wherein the gate of the MOS tube Q1 is the control end of the first controllable switch module, the drain of the MOS tube Q1 is the positive electrode of the first controllable switch module, the source of the MOS tube Q1 is the negative electrode of the first controllable switch module, the drain of the MOS tube Q1 is connected to the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded.

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