A power supply voltage deviation indicator light circuit and power supply circuit

Abstract

A power supply voltage offset indicator light circuit comprises a voltage stabilizing circuit, a first color LED lamp, a second color LED lamp, a third color LED lamp, a first voltage stabilizing tube, a second voltage stabilizing tube, a third voltage stabilizing tube, a fourth voltage stabilizing tube, a first resistor, a second resistor, a third resistor, a first triode and a second triode, wherein the voltage stabilizing circuit is used to provide a reference voltage for the first color LED lamp, the second color LED lamp and the third color LED lamp, the positive electrode of the first color LED lamp is connected to the positive electrode of the power supply, the negative electrode of the first color LED lamp is connected to the power supply voltage Vcc through the first voltage stabilizing tube, the second color LED lamp is connected to the first triode and the second triode, the negative electrode of the third color LED lamp is connected to the positive electrode of the power supply through a seventh resistor, and the positive electrode of the third color LED lamp is connected to the power supply voltage Vcc through the second voltage stabilizing tube. Through the above circuit, the present invention can make the indicator light have different states according to the degree of power supply voltage offset, thereby improving the indication effect.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a power supply voltage offset indicator light circuit and a power supply circuit. Background Art

[0002] The output voltage of a power supply is prone to voltage deviation after being used for a long time. Therefore, it is necessary to detect whether the power supply voltage is low or high in time to prevent the circuit from not working due to low voltage or the output device from burning out due to high voltage. In the power supply voltage indicator circuit of the prior art, the indicator light state is usually fixed when the power supply voltage is offset or jumps, and the indication effect is poor. Summary of the invention

[0003] The object of the present invention is to provide a power supply voltage offset indicator light circuit to address the deficiencies in the prior art, which can make the indicator light have different states according to the offset degree of the power supply voltage, thereby improving the indication effect.

[0004] To achieve this purpose, the present invention adopts the following technical scheme: a power supply voltage offset indicator light circuit, including a voltage stabilizing circuit, a first color LED lamp, a second color LED lamp, a third color LED lamp, a first voltage stabilizing tube, a second voltage stabilizing tube, a third voltage stabilizing tube, a fourth voltage stabilizing tube, a first resistor, a second resistor, a third resistor, a seventh resistor, an eighth resistor, a first triode and a second triode;

[0005] The voltage stabilizing circuit is connected to the positive electrode of the first color LED lamp, one end of the seventh resistor, the negative electrode of the third voltage stabilizing tube, the negative electrode of the fourth voltage stabilizing tube and the positive electrode of the power supply, and is used to provide a reference voltage for the first color LED lamp, the second color LED lamp and the third color LED lamp;

[0006] The positive electrode of the first voltage regulator tube is connected to one end of the first resistor, the negative electrode of the second voltage regulator tube is connected to the power supply voltage Vcc, the negative electrode of the first voltage regulator tube is connected to the negative electrode of the first color LED lamp, the positive electrode of the second voltage regulator tube is connected to the positive electrode of the third color LED lamp, the negative electrode of the third color LED lamp is connected to the other end of the seventh resistor and one end of the eighth resistor, and the other end of the eighth resistor is connected to the negative electrode of the power supply;

[0007] The other end of the first resistor is connected to the positive electrode of the second color LED lamp and the collector of the first transistor, the emitter of the first transistor is connected to the negative electrode of the power supply, and the base of the first transistor is connected to the positive electrode of the third voltage regulator tube through the second resistor;

[0008] The base of the second transistor is connected to the positive electrode of the fourth voltage regulator through the third resistor, the emitter of the second transistor is connected to the negative electrode of the power supply, and the collector of the second transistor is connected to the negative electrode of the second color LED lamp.

[0009] Furthermore, the voltage stabilizing circuit includes a third triode, a capacitor, a fifth voltage stabilizing tube and a fourth resistor;

[0010] The emitter of the third transistor is connected to one end of the capacitor and to the power supply voltage Vcc, the collector of the third transistor is connected to the positive electrode of the power supply and one end of the fourth resistor, the base of the third transistor is connected to the other end of the fourth resistor and the negative electrode of the fifth Zener diode, and the positive electrode of the fifth Zener diode and the other end of the capacitor are both connected to the negative electrode of the power supply.

[0011] Furthermore, it also includes a fifth resistor, which is connected in series between the cathode of the first voltage regulator tube and the cathode of the first color LED lamp.

[0012] Furthermore, it also includes a sixth resistor, which is connected in series between the positive electrode of the second voltage regulator tube and the positive electrode of the third color LED lamp.

[0013] Furthermore, the voltage regulation value of the third voltage regulator tube is greater than the voltage regulation value of the fourth voltage regulator tube.

[0014] Furthermore, the first color LED light is a blue LED light, the second color LED light is a green LED light, and the third color LED light is a red LED light.

[0015] The present invention further provides a power supply circuit, comprising any one of the power supply voltage offset indicator light circuits described above.

[0016] Beneficial effects of the present invention: The power supply voltage offset indicator light circuit of the present invention comprises a voltage stabilizing circuit, a first color LED lamp, a second color LED lamp, a third color LED lamp, a first voltage stabilizing tube, a second voltage stabilizing tube, a third voltage stabilizing tube, a fourth voltage stabilizing tube, a first resistor, a second resistor, a third resistor, a first transistor and a second transistor, wherein the voltage stabilizing circuit is used to provide a reference voltage for the first color LED lamp, the second color LED lamp and the third color LED lamp, the positive electrode of the first color LED lamp is connected to the positive electrode of the power supply, the negative electrode of the first color LED lamp is connected to the power supply voltage Vcc through the first voltage stabilizing tube, the second color LED lamp is connected to the first transistor and the second transistor, the negative electrode of the third color LED lamp is connected to the positive electrode of the power supply through the seventh resistor, and the positive electrode of the third color LED lamp is connected to the power supply voltage Vcc through the second voltage stabilizing tube. Through the above circuit, the present invention can make the indicator light have different states according to the degree of offset of the power supply voltage, thereby improving the indication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The invention discloses a circuit schematic diagram of a power supply voltage offset indicator light circuit provided by an embodiment of the present invention.

[0018] Reference numerals

[0019] in:

[0020] Voltage stabilizing circuit 10 and power supply 20. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to specific embodiments.

[0022] See also Figure 1 The power supply voltage offset indicator light circuit of the present invention includes a voltage stabilizing circuit 10, a first color LED lamp, a second color LED lamp, a third color LED lamp, a first voltage stabilizing tube ZN1, a second voltage stabilizing tube ZN2, a third voltage stabilizing tube ZN3, a fourth voltage stabilizing tube ZN4, a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1 and a second transistor Q2.

[0023] The first color LED lamp may be a blue LED lamp Lb, the second color LED lamp may be a green LED lamp Lg, and the third color LED lamp may be a red LED lamp Lr. Of course, in other embodiments, the first color LED lamp, the second color LED lamp, and the third color LED lamp may be LED lamps of other colors, as long as the colors of the three color lamps are different.

[0024] Among them, the voltage stabilizing circuit 10 is connected to the positive electrode of the blue LED lamp Lb, one end of the seventh resistor R7, the negative electrode of the third voltage stabilizing tube ZN3, the negative electrode of the fourth voltage stabilizing tube ZN4 and the positive electrode of the power supply, and is used to provide a reference voltage for the blue LED lamp Lb, the green LED lamp Lg and the red LED lamp Lr.

[0025] The positive electrode of the first voltage-stabilizer tube ZN1 is connected to one end of the first resistor R1 and the negative electrode of the second voltage-stabilizer tube ZN2 and is connected to the power supply voltage Vcc, the negative electrode of the first voltage-stabilizer tube ZN1 is connected to the negative electrode of the blue LED lamp Lb, the positive electrode of the second voltage-stabilizer tube ZN2 is connected to the positive electrode of the red LED lamp Lr, the negative electrode of the red LED lamp Lr is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the negative electrode of the power supply.

[0026] The other end of the first resistor R1 is connected to the positive electrode of the green LED lamp Lg and the collector of the first transistor Q1, the emitter of the first transistor Q1 is connected to the negative electrode of the power supply, and the base of the first transistor Q1 is connected to the positive electrode of the third voltage regulator ZN3 through the second resistor R2.

[0027] The base of the second transistor Q2 is connected to the positive electrode of the fourth voltage regulator ZN4 through the third resistor R3, the emitter of the second transistor Q2 is connected to the negative electrode of the power supply 20, and the collector of the second transistor Q2 is connected to the negative electrode of the green LED lamp Lg.

[0028] Furthermore, the voltage stabilizing circuit 10 includes a third transistor Q3, a capacitor C, a fifth voltage stabilizing tube ZN5 and a fourth resistor R4.

[0029] The emitter of the third triode Q3 is connected to one end of the capacitor C and to the supply voltage Vcc, the collector of the third triode Q3 is connected to the positive electrode of the power supply 20 and one end of the fourth resistor R4, the base of the third triode Q3 is connected to the other end of the fourth resistor R4 and the negative electrode of the fifth voltage regulator ZN5, and the positive electrode of the fifth voltage regulator ZN5 and the other end of the capacitor C are both connected to the negative electrode of the power supply.

[0030] Among them, in the embodiment of the present invention, the power supply voltage offset indicator circuit further includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected in series between the negative electrode of the first voltage stabilizing diode ZN1 and the negative electrode of the blue LED lamp Lb. The function of the fifth resistor R5 is to limit the current of the blue LED lamp Lb. The sixth resistor R6 is connected in series between the positive electrode of the second voltage stabilizing diode ZN2 and the positive electrode of the red LED lamp Lr. The function of the sixth resistor R6 is to limit the current of the red LED lamp Lr.

[0031] Among them, the voltage stabilizing value of the third voltage stabilizing diode ZN3 is greater than the voltage stabilizing value of the fourth voltage stabilizing diode ZN4.

[0032] Continue to refer to Figure 1 , in the power supply voltage offset indicator circuit of the present invention, the Vin voltage, that is, the output voltage of the power supply 20, is the voltage at the Vin position in the figure. Among them, when the Vin voltage is greater than the voltage stabilizing value of the fourth voltage stabilizing diode ZN4 and less than the voltage stabilizing value of the third voltage stabilizing diode ZN3, that is, when ZN4 < Vin < ZN3, the second triode Q2 is turned on and the first triode Q1 is not turned on. At this time, the green LED lamp Lg emits light, indicating that the output voltage of the power supply 20 is within the normal range. When the Vin voltage is less than the voltage stabilizing value of the fourth voltage stabilizing diode ZN4, both the second triode Q2 and the first triode Q1 are not turned on, and the green LED lamp Lg does not emit light. And when the Vin voltage is greater than the voltage stabilizing value of the third voltage stabilizing diode ZN3, both the second triode Q2 and the first triode Q1 are turned on. At this time, the positive terminal of the green LED lamp Lg is grounded through the first triode Q1. Therefore, the green LED lamp Lg also does not emit light. That is, when the Vin voltage is less than the voltage stabilizing value of the fourth voltage stabilizing diode ZN4 or the Vin voltage is greater than the voltage stabilizing value of the third voltage stabilizing diode ZN3, the green LED lamp Lg does not emit light, indicating that the output voltage of the power supply 20 is not within the normal range.

[0033] The eighth resistor R8 and the seventh resistor R7 divide the Vin voltage to obtain the Va voltage, that is, Figure 1 the voltage at the Va position shown. When the Va voltage is greater than or equal to the sum of the voltage stabilizing value of the second voltage stabilizing diode ZN2 and the positive terminal voltage value of the red LED lamp Lr, the red LED lamp Lr does not light. When the Va voltage is less than the sum of the voltage stabilizing value of the second voltage stabilizing diode ZN2 and the positive terminal voltage value of the red LED lamp Lr, the red LED lamp Lr emits light, indicating that the output voltage of the power supply 20 has a negative offset, and the red LED lamp Lr will be brighter as the Vin voltage is smaller. Thus, the negative offset degree of the output voltage of the power supply 20 can be judged according to the brightness of the red LED lamp Lr, that is, the more negative the output voltage of the power supply 20 is offset, the brighter the red LED lamp Lr is.

[0034] When the voltage regulation value of the first voltage regulator tube ZN1 plus the positive terminal voltage value of the blue LED lamp Lb is equal to or greater than the Vin voltage minus the power supply voltage Vcc, the blue LED lamp Lb does not light up; and when the voltage regulation value of the first voltage regulator tube ZN1 plus the positive terminal voltage value of the blue LED lamp Lb is less than the Vin voltage minus the power supply voltage Vcc, the blue LED lamp Lb lights up, which indicates that the output voltage of the power supply 20 has a positive offset, and the blue LED lamp Lb will become brighter as the Vin voltage increases. Therefore, the degree of positive offset of the output voltage of the power supply 20 can be judged according to the degree of brightness of the blue LED lamp Lb, that is, the more positive offset the output voltage of the power supply 20 has, the brighter the blue LED lamp Lb is.

[0035] Therefore, through the power supply voltage deviation indicator circuit of the present invention, it is possible to judge whether the output voltage of the power supply 20 is within the normal range or whether a positive deviation or a negative deviation is generated according to the lighting of the green LED lamp Lg, the red LED lamp Lr and the blue LED lamp Lb, so that when a voltage deviation or a voltage jump occurs, it is possible to timely find that the voltage is low or the voltage is high, and take corrective measures in time, thereby preventing the circuit from failing to work due to low voltage or the output device from burning due to high voltage. In addition, the positive deviation degree and the negative deviation degree can be judged according to the lighting degree of the red LED lamp Lr and the blue LED lamp Lb, respectively, and the indication effect is better.

[0036] An embodiment of the present invention further provides a power supply circuit, including the power supply voltage offset indicator light circuit described in the embodiment.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A power supply voltage deviation indicator light circuit, characterized in that: It includes a voltage stabilizing circuit, a first color LED lamp, a second color LED lamp, a third color LED lamp, a first voltage stabilizing tube, a second voltage stabilizing tube, a third voltage stabilizing tube, a fourth voltage stabilizing tube, a first resistor, a second resistor, a third resistor, a seventh resistor, an eighth resistor, a first triode, and a second triode; The voltage stabilizing circuit is connected to the positive electrode of the first color LED lamp, one end of the seventh resistor, the negative electrode of the third voltage stabilizing tube, the negative electrode of the fourth voltage stabilizing tube and the positive electrode of the power supply, and is used to provide a reference voltage for the first color LED lamp, the second color LED lamp and the third color LED lamp; The positive electrode of the first voltage regulator tube is connected to one end of the first resistor, the negative electrode of the second voltage regulator tube is connected to the power supply voltage Vcc, the negative electrode of the first voltage regulator tube is connected to the negative electrode of the first color LED lamp, the positive electrode of the second voltage regulator tube is connected to the positive electrode of the third color LED lamp, the negative electrode of the third color LED lamp is connected to the other end of the seventh resistor and one end of the eighth resistor, and the other end of the eighth resistor is connected to the negative electrode of the power supply; The other end of the first resistor is connected to the positive electrode of the second color LED lamp and the collector of the first transistor, the emitter of the first transistor is connected to the negative electrode of the power supply, and the base of the first transistor is connected to the positive electrode of the third voltage regulator tube through the second resistor; The base of the second transistor is connected to the positive electrode of the fourth voltage regulator tube through the third resistor, the emitter of the second transistor is connected to the negative electrode of the power supply, and the collector of the second transistor is connected to the negative electrode of the second color LED lamp; The voltage stabilization value of the third voltage regulator tube is greater than the voltage stabilization value of the fourth voltage regulator tube.

2. The power supply voltage deviation indicator light circuit according to claim 1, characterized in that: The voltage stabilizing circuit includes a third triode, a capacitor, a fifth voltage stabilizing tube and a fourth resistor; The emitter of the third transistor is connected to one end of the capacitor and to the power supply voltage Vcc, the collector of the third transistor is connected to the positive electrode of the power supply and one end of the fourth resistor, the base of the third transistor is connected to the other end of the fourth resistor and the negative electrode of the fifth Zener diode, and the positive electrode of the fifth Zener diode and the other end of the capacitor are both connected to the negative electrode of the power supply.

3. The power supply voltage deviation indicator light circuit according to claim 1, characterized in that: It also includes a fifth resistor, which is connected in series between the cathode of the first voltage regulator tube and the cathode of the first color LED lamp.

4. The power supply voltage deviation indicator light circuit according to claim 1, characterized in that: It also includes a sixth resistor, which is connected in series between the positive electrode of the second voltage regulator tube and the positive electrode of the third color LED lamp.

5. The power supply voltage deviation indicator light circuit according to claim 1, characterized in that: The first color LED light is a blue LED light, the second color LED light is a green LED light, and the third color LED light is a red LED light.

6. A power supply circuit, characterized in that: It comprises a power supply voltage offset indicator light circuit as described in any one of claims 1 to 5.

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