CN206432735U - A DC power supply dual working state control circuit - Google Patents

Abstract

The utility model discloses a two operating condition control circuit of DC power supply, including power detection circuit, relay control circuit and scintillation pilot lamp circuit, power detection circuit includes resistance R1, resistance R2, the adjustable reference source T1 of three-terminal and potentiometre RP1, and relay control circuit includes triode V1 and relay K, and scintillation pilot lamp circuit includes resistance R3, resistance R4, two base diode V2 and triode V3. The utility model discloses two operating condition control circuit of DC power supply pass through mains voltage collection module and reference voltage module and provide voltage for two voltage input of voltage comparator chip respectively, and the operating condition who utilizes voltage comparator's basic characteristic to combine triode and relay to the circuit controls, can enough prevent that the power from leading to the lower life-span reduction of voltage consequently because the overdischarge, can send the scintillation light again and make timely warning.

Description

A DC power supply dual working state control circuit

technical field

The utility model relates to a power supply circuit, in particular to a DC power supply double working state control circuit.

Background technique

Batteries are the most common energy storage components in daily life, ranging from automobiles and electric vehicles to small mobile phones and charging treasures. As we all know, the service life of batteries will become less and less with the prolongation of use time. A large part of the reason is that the voltage drop caused by the over-discharge of the battery will cause acidification of the plates, thereby reducing the normal service life of the battery. At present, most batteries on the market are not equipped with under-voltage protection devices. The reason is that most of the existing under-voltage protection circuits have structures Complicated, the produced protection device has a large volume, and the static power consumption is large when used to monitor the voltage, which wastes electric energy and affects the output voltage stability of the load.

Utility model content

The purpose of this utility model is to provide a DC power supply dual working state control circuit with simple structure and convenient use, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions:

A DC power supply dual working state control circuit, including a power detection circuit, a relay control circuit and a flashing indicator circuit, the power detection circuit includes a resistor R1, a resistor R2, a three-terminal adjustable reference source T1 and a potentiometer RP1, and the relay control The circuit includes a triode V1 and a relay K, and the blinking indicator circuit includes a resistor R3, a resistor R4, a double-base diode V2 and a triode V3;

One end of the resistor R1 is connected to the resistor R2, the relay K, the pin 2 of the chip IC1, the moving end of the contact K-1 of the relay K, and the positive pole of the power supply E, and the other end of the resistor R1 is connected to the three-terminal adjustable reference source T1 The cathode of the resistor R2 is connected to the pin 3 of the chip IC1, the other end of the resistor R2 is connected to the potentiometer RP1 and the pin 1 of the chip IC1, the pin 4 of the chip IC1 is connected to the base of the triode V1, and the collector of the triode V1 is connected to the other end of the relay K One end, the other end of potentiometer RP1 is connected to capacitor C1, resistor R5, emitter of transistor V1, emitter of transistor V3, resistor R8, load A, anode of three-terminal adjustable reference source T1 and negative electrode of power supply E, relay K The fixed end 1 of the contact K-1 is connected to the anode of the resistor R3, the resistor R4 and the diode D1, the other end of the resistor R3 is connected to the other end of the capacitor C1 and the emitter of the double-base diode V2, and the other end of the resistor R4 is connected to The first base of the double-base diode V2, the other end of the resistor R5 is connected to the second base of the double-base diode V2 and the resistor R6, the other end of the resistor R6 is connected to the base of the transistor V3, and the collector of the transistor V3 is connected to the resistor R7, the other end of the resistor R7 is connected to the cathode of the diode D1, and the cathode of the diode D2 is connected to the other end of the resistor R8.

As a preferred solution of the utility model: the model of the chip IC1 is LM321.

As a preferred solution of the present invention: the diode D1 is a red light emitting diode, and the diode D2 is a green light emitting diode.

Compared with the prior art, the beneficial effect of the utility model is that the DC power supply dual working state control circuit of the utility model provides voltages for the two voltage input terminals of the voltage comparator chip respectively through the power supply voltage acquisition module and the reference voltage module, and utilizes The basic characteristics of the voltage comparator are combined with the triode and the relay to control the working state of the circuit, which can not only prevent the life of the power supply from being reduced due to low voltage due to over-discharge, but also emit a flashing light to remind in time.

Description of drawings

Figure 1 is a circuit diagram of a DC power supply dual working state control circuit.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1, a DC power supply dual working state control circuit, including a power supply detection circuit, a relay control circuit and a flashing indicator circuit, the power detection circuit includes a resistor R1, a resistor R2, a three-terminal adjustable reference source T1 and a potential RP1, the relay control circuit includes a transistor V1 and a relay K, and the flashing indicator circuit includes a resistor R3, a resistor R4, a double-base diode V2 and a transistor V3;

One end of the resistor R1 is connected to the resistor R2, the relay K, the pin 2 of the chip IC1, the moving end of the contact K-1 of the relay K, and the positive pole of the power supply E, and the other end of the resistor R1 is connected to the three-terminal adjustable reference source T1 The cathode of the resistor R2 is connected to the pin 3 of the chip IC1, the other end of the resistor R2 is connected to the potentiometer RP1 and the pin 1 of the chip IC1, the pin 4 of the chip IC1 is connected to the base of the triode V1, and the collector of the triode V1 is connected to the other end of the relay K One end, the other end of potentiometer RP1 is connected to capacitor C1, resistor R5, emitter of transistor V1, emitter of transistor V3, resistor R8, load A, anode of three-terminal adjustable reference source T1 and negative electrode of power supply E, relay K The fixed end 1 of the contact K-1 is connected to the anode of the resistor R3, the resistor R4 and the diode D1, the other end of the resistor R3 is connected to the other end of the capacitor C1 and the emitter of the double-base diode V2, and the other end of the resistor R4 is connected to The first base of the double-base diode V2, the other end of the resistor R5 is connected to the second base of the double-base diode V2 and the resistor R6, the other end of the resistor R6 is connected to the base of the transistor V3, and the collector of the transistor V3 is connected to the resistor R7, the other end of the resistor R7 is connected to the cathode of the diode D1, and the cathode of the diode D2 is connected to the other end of the resistor R8.

The model of chip IC1 is LM321. The diode D1 is a red light emitting diode, and the diode D2 is a green light emitting diode.

The working principle of the utility model is: the chip IC1 in the circuit, the resistor R1, the resistor R2, the three-terminal adjustable reference source T1, etc. form a voltage detection module, wherein the reference voltage is composed of the resistor R1 and the three-terminal adjustable reference source T1. The basic characteristics of the three-terminal adjustable reference source show that the voltage of its cathode is a stable value, so the voltage of pin 3 of the chip IC1 is fixed, and the resistor R2 and the potentiometer RP1 are used as the sampling module of the power supply voltage. When the voltage of E is normal, the voltage of pin 1 of chip IC1 is higher than the voltage of pin 3. At this time, chip IC1 outputs low level, triode V1 is not conducting, relay K is not energized, and its contact K-1 Connect the fixed terminal 2, at this time, the load A is energized, and the light-emitting diode D2 lights up at the same time, as the indicator light of the normal power supply, with the discharge of E, its voltage continues to decrease, so the resistor R2 and the potentiometer RP1 divide the voltage The voltage also decreases, that is, the voltage of pin 1 of chip IC1 decreases. When the voltage of pin 1 of chip IC1 drops below the reference voltage of pin 3, pin 4 of chip IC1 outputs a high level, the transistor V1 is turned on, and the relay K is powered on. The contact K-1 is connected to the fixed terminal 1, at this time, the battery voltage charges C1 through R3 (the charging time is determined by R3 and C1), so that V2 and V3 are intermittently conducted, and the light-emitting diode D1 flashes to remind the user, at this time The battery is under voltage, and the battery should be charged to avoid damage to the battery due to over-discharge.

Claims (3)

1. a DC power supply dual working state control circuit, comprising a power detection circuit, a relay control circuit and a flashing indicator light circuit, is characterized in that, the power detection circuit comprises a resistor R1, a resistor R2, a three-terminal adjustable reference source T1 and Potentiometer RP1, relay control circuit includes triode V1 and relay K, flashing indicator circuit includes resistor R3, resistor R4, double base diode V2 and triode V3; One end of the resistor R1 is connected to the resistor R2, the relay K, the pin 2 of the chip IC1, the moving end of the contact K-1 of the relay K, and the positive pole of the power supply E, and the other end of the resistor R1 is connected to the three-terminal adjustable reference source T1 The cathode of the resistor R2 is connected to the pin 3 of the chip IC1, the other end of the resistor R2 is connected to the potentiometer RP1 and the pin 1 of the chip IC1, the pin 4 of the chip IC1 is connected to the base of the triode V1, and the collector of the triode V1 is connected to the other end of the relay K One end, the other end of potentiometer RP1 is connected to capacitor C1, resistor R5, emitter of transistor V1, emitter of transistor V3, resistor R8, load A, anode of three-terminal adjustable reference source T1 and negative electrode of power supply E, relay K The fixed end 1 of the contact K-1 is connected to the anode of the resistor R3, the resistor R4 and the diode D1, the other end of the resistor R3 is connected to the other end of the capacitor C1 and the emitter of the double-base diode V2, and the other end of the resistor R4 is connected to The first base of the double-base diode V2, the other end of the resistor R5 is connected to the second base of the double-base diode V2 and the resistor R6, the other end of the resistor R6 is connected to the base of the transistor V3, and the collector of the transistor V3 is connected to the resistor R7, the other end of the resistor R7 is connected to the cathode of the diode D1, and the cathode of the diode D2 is connected to the other end of the resistor R8. 2. A DC power supply dual working state control circuit according to claim 1, characterized in that the model of the chip IC1 is LM321. 3 . The DC power supply dual working state control circuit according to claim 1 , wherein the diode D1 is a red light emitting diode, and the diode D2 is a green light emitting diode. 4 .