TW201518734A - Save energy voltage detection circuit - Google Patents

Abstract

A save energy voltage detection circuit includes a controller, an electronic switch, first and second dividing voltage resistors, and first and second resistor. A first terminal of the electronic switch is connected to a voltage pin of the controller and a system voltage terminal of an electronic device through the first resistor. The second resistor is connected between the first terminal of the electronic switch and ground. A second terminal of the electronic switch is connected to a detection voltage to be tested through the first dividing voltage resistor. A third terminal of the electronic switch is grounded through the second dividing voltage resistor. The third terminal of the electronic witch is also connected to a detection pin of the controller.

Description

Energy-saving voltage detection circuit

The invention relates to an energy-saving voltage detecting circuit.

With the increasing awareness of environmental protection and energy conservation, designing energy-saving circuits has become a new trend in electronic products. At present, the voltage detecting circuit used in the circuit design generally supplies the voltage to be detected to the controller by connecting two voltage dividing resistors in series, so that the controller performs voltage detection control. However, when the electronic product is in the standby state, the series voltage dividing resistor is always connected to the voltage detecting circuit and consumes electric energy, thereby causing waste of electric energy.

In view of the above, it is necessary to provide an energy-saving voltage detecting circuit for detecting the detected voltage while saving power.

An energy-saving voltage detecting circuit is applied to an electronic device, wherein the energy-saving voltage detecting circuit comprises a controller, an electronic switch, first and second voltage dividing resistors, and first and second resistors, and the electronic switch One end is connected to the voltage pin of the controller and the system voltage end of the electronic device via the first resistor, the second resistor is connected between the first end of the electronic switch and the ground, and the second end of the electronic switch is The first voltage dividing resistor is connected to a voltage to be detected, the third end of the electronic switch is grounded via the second voltage dividing resistor, and the third end of the electronic switch is further connected to the detecting pin of the controller, the controller The first preset voltage value is stored in the first preset voltage value, and the first preset voltage value is greater than the second preset voltage value. When the voltage of the voltage pin of the controller is greater than the first preset voltage value, the controller Starting work, when the voltage of the voltage pin of the controller is less than the second preset voltage value, the controller stops working; when the electronic device is powered on, the system voltage terminal output voltage of the electronic device is given to the controller Voltage pin and the power The first end of the switch, because the voltage outputted by the voltage terminal of the system does not reach the first preset voltage value, the controller does not work, the electronic switch is turned on, and the voltage to be detected passes through the first partial voltage. The resistor and the electronic switch are output to the detecting pin of the controller, and when the voltage of the voltage pin of the controller reaches the first preset value, the controller starts to work; when the electronic device stands by, the electronic device The system voltage terminal of the device stops outputting the voltage to the voltage pin of the controller and the first end of the electronic switch, the voltage pin of the controller begins to discharge, the electronic switch continues to be turned on, and the voltage pin of the controller passes through the Discharging the first and second resistors and also discharging through the first resistor, the electronic switch, and the second voltage dividing resistor, when the voltage of the voltage pin of the controller is less than the second preset voltage value, the controller When the operation is stopped, the voltage of the first end of the electronic switch is discharged through the second resistor until the electronic switch is turned off.

The energy-saving voltage detecting circuit controls the electronic switch to be turned on to output a voltage to be detected to the controller for detection when the electronic device is powered on, and stops by controlling the electronic switch to be turned off when the electronic device is in standby mode. The voltage to be tested is output to the controller, thereby preventing the first and second voltage dividing resistors from consuming electric energy, thereby achieving the purpose of saving electric energy.

1 is a block diagram of a preferred embodiment of the energy-saving voltage detecting circuit of the present invention.

Referring to FIG. 1 , the energy-saving voltage detecting circuit 100 of the present invention is applied to an electronic device. The preferred embodiment of the energy-saving voltage detecting circuit 100 includes a controller U1 and an electronic switch (in this embodiment, an N). Channel field effect transistor Q), two voltage dividing resistors R1 and R2 and two resistors R3 and R4. The gate, the drain and the source of the field effect transistor Q respectively correspond to the first to third ends of the electronic switch. The gate of the field effect transistor Q is connected to the voltage pin VCC of the controller U1 and the system voltage terminal V1 of the electronic device via the resistor R3. The resistor R4 is connected to the gate of the field effect transistor Q and the ground. between. The drain of the field effect transistor Q is connected to a voltage to be detected 10 via the voltage dividing resistor R1. The source of the field effect transistor Q is grounded via the voltage dividing resistor R2, and the source of the field effect transistor Q is further Connect to the detection pin S1 of the controller U1. The first preset voltage value is stored in the controller U1, and the first preset voltage value is greater than the second preset voltage value. In this embodiment, the first preset voltage value is 10V, and the first The second preset voltage value is 8V. When the voltage of the voltage pin VCC of the controller U1 is greater than the first preset voltage value, the controller U1 starts to work, when the voltage of the voltage pin VCC of the controller U1 is less than the second preset voltage value, Controller U1 stops working.

When the electronic device is powered on, the system voltage terminal V1 of the electronic device outputs a voltage to the voltage pin VCC of the controller U1 and the gate of the field effect transistor Q. Since the voltage outputted by the voltage terminal V1 of the system does not reach the first preset voltage value (10V) at this time, the controller U1 does not operate at this time, and the gate of the field effect transistor Q is from the voltage terminal V1 of the system. Receiving a high level signal and conducting, the voltage to be detected 10 is output to the detecting pin S1 of the controller U1 through the voltage dividing resistor R1 and the field effect transistor Q, and then the voltage at the controller U1 When the voltage of the pin VCC reaches the first preset value (10V), the controller U1 starts to work. That is, the field effect transistor Q is turned on before the controller U1 starts to operate to provide the to-be-detected voltage 10 to the detection pin S1 of the controller U1, thereby ensuring the correct operation timing of the energy-saving voltage detecting circuit 100. .

When the electronic device is in standby, the system voltage terminal V1 of the electronic device stops outputting a voltage to the voltage pin VCC of the controller U1 and the gate of the field effect transistor Q. At this time, the voltage pin VCC of the controller U1 starts to discharge, and the gate of the field effect transistor Q receives a high level signal from the voltage pin VCC of the controller U1 to continue to be turned on, and the voltage pin VCC of the controller U1. Discharge through the resistors R3 and R4, and also discharge through the resistor R3, the field effect transistor Q and the voltage dividing resistor R2, when the voltage of the voltage pin VCC of the controller U1 is less than the second preset voltage value (8V) The controller U1 stops operating, and then the voltage of the gate of the field effect transistor Q is discharged through the resistor R4 until it is smaller than the on-voltage of the field effect transistor Q, and the field effect transistor Q is turned off. That is, the field effect transistor Q is turned off after the controller U1 stops working to stop the voltage to be detected 10 from being output to the controller U1 through the resistors R1 and R2, so that the voltage dividing resistor is in standby when the electronic device is in standby. R1 and R2 do not consume electrical energy, thereby achieving the purpose of saving energy by the energy-saving voltage detecting circuit 100 at the correct timing.

The energy-saving voltage detecting circuit 100 controls the field-effect transistor Q to be turned on when the electronic device is powered on to output the voltage to be detected 10 to the controller U1 for detection, and transmits control when the electronic device is in standby mode. The field effect transistor Q is turned off to stop the voltage to be detected 10 from being output to the controller U1, thereby preventing the voltage dividing resistors R1 and R2 in the voltage detecting circuit from consuming electric energy, thereby achieving the purpose of saving electric energy.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100‧‧‧Energy saving voltage detection circuit

10‧‧‧voltage to be detected

V1‧‧‧ system voltage terminal

Q‧‧‧ Field Effect Transistor

R1, R2‧‧‧ voltage divider resistor

R3, R4‧‧‧ resistance

U1‧‧‧ controller

no

100‧‧‧Energy saving voltage detection circuit

10‧‧‧voltage to be detected

V1‧‧‧ system voltage terminal

Q‧‧‧ Field Effect Transistor

R1, R2‧‧‧ voltage divider resistor

R3, R4‧‧‧ resistance

U1‧‧‧ controller

Claims (3)

An energy-saving voltage detecting circuit is applied to an electronic device, wherein the energy-saving voltage detecting circuit comprises a controller, an electronic switch, first and second voltage dividing resistors, and first and second resistors, and the electronic switch One end is connected to the voltage pin of the controller and the system voltage end of the electronic device via the first resistor, the second resistor is connected between the first end of the electronic switch and the ground, and the second end of the electronic switch is The first voltage dividing resistor is connected to a voltage to be detected, the third end of the electronic switch is grounded via the second voltage dividing resistor, and the third end of the electronic switch is further connected to the detecting pin of the controller, the controller The first preset voltage value is stored in the first preset voltage value, and the first preset voltage value is greater than the second preset voltage value. When the voltage of the voltage pin of the controller is greater than the first preset voltage value, the controller Starting work, when the voltage of the voltage pin of the controller is less than the second preset voltage value, the controller stops working; when the electronic device is powered on, the system voltage terminal output voltage of the electronic device is given to the controller Voltage pin and the power The first end of the switch, because the voltage outputted by the voltage terminal of the system does not reach the first preset voltage value, the controller does not work, the electronic switch is turned on, and the voltage to be detected passes through the first partial voltage. The resistor and the electronic switch are output to the detecting pin of the controller, and when the voltage of the voltage pin of the controller reaches the first preset value, the controller starts to work; when the electronic device stands by, the electronic device The system voltage terminal of the device stops outputting the voltage to the voltage pin of the controller and the first end of the electronic switch, the voltage pin of the controller begins to discharge, the electronic switch continues to be turned on, and the voltage pin of the controller passes through the Discharging the first and second resistors and also discharging through the first resistor, the electronic switch, and the second voltage dividing resistor, when the voltage of the voltage pin of the controller is less than the second preset voltage value, the controller When the operation is stopped, the voltage of the first end of the electronic switch is discharged through the second resistor until the electronic switch is turned off. The energy-saving voltage detecting circuit of claim 1, wherein the first preset voltage value is 10V, and the second preset voltage value is 8V. The energy-saving voltage detecting circuit of claim 1, wherein the electronic switch is an N-channel field effect transistor, and the first to third ends of the electronic switch respectively correspond to the gate of the field effect transistor, Bungee and source.