CN219997512U

CN219997512U - Constant-current power supply with precise voltage function

Info

Publication number: CN219997512U
Application number: CN202321632198.6U
Authority: CN
Inventors: 黄帅峰
Original assignee: Nantong Saiyi Intelligent Technology Co ltd
Current assignee: Nantong Saiyi Intelligent Technology Co ltd
Priority date: 2023-06-26
Filing date: 2023-06-26
Publication date: 2023-11-10
Anticipated expiration: 2033-06-26

Abstract

The constant-current power supply with the precise voltage function comprises a transformer, a storage battery, a motor speed reducing mechanism, a primary voltage stabilizing circuit, a high voltage detecting circuit and a low voltage detecting circuit; the primary voltage stabilizing circuit is matched with an adjustable resistor A, a transformer, a lithium storage battery, the primary voltage stabilizing circuit, a high voltage detecting circuit, a low voltage detecting circuit and the adjustable resistor A are arranged in the element box and are electrically connected, a supporting frame is arranged at the side end of the adjustable resistor A, a motor speed reducing mechanism is arranged at the upper part of the inner side end of the supporting frame, the lower end of a power output shaft is arranged together with the upper side end of an adjusting handle of the adjustable resistor A, a fixing plate is arranged at the side end of a shell of the adjustable resistor A, a power switch is respectively arranged at the front end and the rear end of the fixing plate, and a baffle is arranged at one side of the lower end of the power output shaft. This novel when the unusual high or low of voltage of output, can compensate the regulation to output voltage voluntarily to in time maintain or change through suggestion user such as luminous, guaranteed output power supply voltage and electric current invariable as far as possible.

Description

Constant-current power supply with precise voltage function

Technical Field

The utility model relates to the technical field of power supplies, in particular to a constant-current power supply with a precision voltage function.

Background

The alternating current-to-direct current stabilized power supply module is an electrical component which is widely used, and is mainly used for supplying power to a direct current load, charging a storage battery and the like.

The patent numbers of China '200920192389.9' and the patent name 'regulated power supply circuit' are issued to the patent, and the content of the patent is recorded in the 'regulated power supply circuit' which can reduce the power loss on the voltage regulator so as to ensure the working reliability and the service life of the voltage regulator and ensure high output power quality. The above-mentioned patent has the advantages described, but is limited by the structure, and the following disadvantages are still needed to be improved as other voltage stabilizing circuits in the field. The power voltage output by the power output end of the power supply device fails in the corresponding element in the power output end, so that when the output power voltage is too high or too low, the power voltage cannot be automatically adjusted, and a user cannot be prompted, so that the probability that the electric equipment (including a storage battery) is damaged due to the too high voltage or the too low voltage exists. In summary, it is especially necessary to provide a constant current power supply which not only can output stable direct current power supply, but also can automatically carry out compensatory adjustment and prompt a user when the voltage is abnormal, and reduce the damage of electric equipment.

Disclosure of Invention

In order to overcome the defects of the prior AC-DC power supply module as described in the background due to the limitation of the structure, the utility model provides the constant-current power supply with the precise voltage function, which not only can output a stable DC power supply by the combined action of related mechanisms, but also can automatically perform compensatory adjustment when the output voltage of the voltage stabilizing circuit is abnormally high or low due to various reasons, prompt a user to timely maintain or replace the voltage by luminescence and the like, and reduce the damage probability of electric equipment as much as possible.

The technical scheme adopted for solving the technical problems is as follows:

the constant-current power supply with the precise voltage function comprises a transformer, a storage battery and a motor speed reducing mechanism, and is characterized by further comprising a primary voltage stabilizing circuit, a high-voltage detection circuit and a low-voltage detection circuit; the primary voltage stabilizing circuit is matched with an adjustable resistor A, a transformer, a lithium storage battery, a primary voltage stabilizing circuit, a voltage detecting circuit and an adjustable resistor A are arranged in the element box, a supporting frame is arranged at the side end of the adjustable resistor A, a motor speed reducing mechanism is arranged at the upper part of the inner side end of the supporting frame, the lower end of a power output shaft is arranged together with the upper side end of an adjusting handle of the adjustable resistor A, a fixing plate is arranged at the side end of a shell of the adjustable resistor A, a power switch is respectively arranged at the front end and the rear end of the fixing plate, and a baffle is arranged at one side of the lower end of the power output shaft; the power output end of the primary voltage stabilizing circuit is electrically connected with the voltage detecting circuit, the voltage detecting circuit and the power input end of the lithium storage battery respectively, and the signal input ends of the voltage detecting circuit and the voltage detecting circuit are electrically connected with the power output end of the lithium storage battery; the two terminals of the adjustable resistor A are electrically connected in series between the two signal input ends of the primary voltage stabilizing circuit, and the power output ends of the voltage detecting circuit and the voltage detecting circuit are electrically connected with the power input end of the motor speed reducing mechanism.

Further, the power switch is a normally closed contact type power switch.

Further, the primary voltage stabilizing circuit comprises an electrically connected three-terminal integrated voltage stabilizer, a diode, a rectifier bridge stack, an electrolytic capacitor, a ceramic chip capacitor and a resistor, wherein a power input end of the three-terminal integrated voltage stabilizer is connected with a cathode of the first diode, an anode of the first electrolytic capacitor, one end of the first ceramic chip capacitor and a power output end of an anode of the rectifier bridge stack, a power output end of the three-terminal integrated voltage stabilizer is connected with one end of the resistor, the anode of the first diode, a cathode of the second diode and one end of the second ceramic chip capacitor, the cathode of the first electrolytic capacitor is connected with the other end of the first ceramic chip capacitor, the cathode of the second electrolytic capacitor, the other end of the second ceramic chip capacitor and the cathode power output end of the rectifier bridge stack, and the other end of the resistor is connected with an adjusting end of the three-terminal integrated voltage stabilizer and the anode of the second electrolytic capacitor.

Further, the low detection circuit comprises an operational amplifier, an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, wherein the positive power input end and the positive control power input end of the relay are connected with the positive power input end of the operational amplifier, one end of the first adjustable resistor is connected with the base electrode of the NPN triode, the collector electrode of the NPN triode is connected with the negative power input end of the relay, one end of the first resistor is connected with one end of the second resistor, the negative power input end of the operational amplifier, the emitter electrode of the NPN triode and the negative control power input end of the relay, the other end of the first adjustable resistor is connected with the reverse input end of the operational amplifier, the other end of the first resistor, and the other end of the second adjustable resistor is connected with the same-direction input end of the operational amplifier and the other end of the second resistor.

Further, the high detection circuit includes electric connection's fortune is put, adjustable resistance, PNP triode and relay, the positive pole control power input of relay and the positive pole power input of fortune is put, first adjustable resistance one end, PNP triode projecting pole is connected, the output and the PNP triode base pole of fortune are connected, PNP triode collecting electrode and relay positive pole power input are connected, first resistance one end and second resistance one end, the negative pole power input of fortune is put, relay negative pole control power input and negative pole power input are connected, the reverse input of first adjustable resistance other end and fortune is put, the first resistance other end is connected, the second adjustable resistance other end and the syntropy input of fortune is put, the second resistance other end is connected.

Further, one normally open contact end of the relay of the low voltage detection circuit and the high voltage detection circuit is respectively connected with the two ends of the power input of the motor speed reducing mechanism in series through two power switches, and the two ends of the power input of the motor speed reducing mechanism are connected with an indicator lamp in parallel.

The utility model has the beneficial effects that: the utility model discloses under transformer, elementary voltage stabilizing circuit combined action, can self output stable DC power supply, and when the unusual high or low that becomes of voltage that leads to the output because of various reasons at elementary voltage stabilizing circuit, high detection circuitry or low detection circuitry detects the back can control motor reduction gears and drive adjustable resistance A's handle clockwise or anticlockwise rotation, can carry out compensatory to output voltage automatically and adjust, and prompt the user in time maintain or change through luminous etc. the power supply voltage and the electric current of having guaranteed the output as far as possible (this novel output's electric current is invariable, mainly adjust output voltage stability), the probability that the consumer damaged has been reduced.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic block diagram of the overall structure of the present utility model.

Fig. 2 is a schematic diagram of the outline structure of the present utility model.

Fig. 3 is a circuit diagram of the present utility model.

Detailed Description

The constant-current power supply with the precise voltage function shown in figures 1, 2 and 3 comprises a transformer T, a lithium storage battery G1, a motor speed reducing mechanism M, a primary voltage stabilizing circuit 1, a high voltage detecting circuit 2 and a low voltage detecting circuit 3; the primary voltage stabilizing circuit is matched with an adjustable resistor ARP1, a transformer T, a lithium storage battery G1, the primary voltage stabilizing circuit 1, a high-voltage detecting circuit 2, a low-voltage detecting circuit 3 and the adjustable resistor ARP1 are arranged on a circuit board in the element box 4, two n-shaped supporting frames 5 are vertically welded at two parts of the side end of the adjustable resistor ARP1, a motor reducing mechanism M is vertically arranged at the upper part of the inner side end of the supporting frame 5, the lower end of a power output shaft is welded with the upper side end of an adjusting handle of the adjustable resistor ARP1, a fixed plate 6 is vertically welded at the left side end of a shell of the adjustable resistor ARP1, a point-type power switch S1 and a point-type power switch S2 are respectively adhered at the upper parts of the front end and the rear end of the fixed plate 6 by using glue, a power switch S1 button at the rear end faces forward, a baffle 7 is transversely welded at the left side of the lower end of the power output shaft, and the height of the baffle 7 is lower than the heights of the power switches S1 and S2.

As shown in fig. 1, 2, and 3, the power switches S1 and S2 are normally closed contact type power switches. The primary voltage stabilizing circuit comprises a three-terminal integrated voltage stabilizer A2, diodes VD and VD1, a rectifier bridge stack A1, electrolytic capacitors C1 and C3, ceramic chip capacitors C2 and C4 and a resistor R1 which are connected through circuit board wiring, wherein a power input end 3 pin of the three-terminal integrated voltage stabilizer A2 is connected with a cathode of the first diode VD, an anode of the first electrolytic capacitor C1, one end of the first ceramic chip capacitor C2 and a power output end 3 pin of the rectifier bridge stack A1, a power output end 2 pin of the three-terminal integrated voltage stabilizer A2 is connected with one end of the resistor R1, the anode of the first diode VD, the cathode of the second diode VD1 and one end of the second ceramic chip capacitor C4, the cathode of the first electrolytic capacitor C1 is connected with the other end of the first ceramic chip capacitor C2, the cathode of the second electrolytic capacitor C3, the other end of the second ceramic chip capacitor C4 and a cathode power output end 4 pin of the rectifier bridge stack A1, and the other end of the resistor R1 is connected with an adjusting end 1 pin of the three-terminal integrated voltage stabilizer A2, the anode of the second electrolytic capacitor C3 and the anode of the second diode VD 1. The low voltage detection circuit comprises an operational amplifier A3, adjustable resistors RP2 and RP3, resistors R and R2, an NPN triode Q1 and a relay K1 which are connected through circuit board wiring, wherein the positive power input end and the positive control power input end of the relay K1 are connected with the positive power input end 7 pin of the operational amplifier A3, one end of a first adjustable resistor RP3 is connected, the output end 6 pin of the operational amplifier A3 is connected with the base of the NPN triode Q1, the collector of the NPN triode Q1 is connected with the negative power input end of the relay K1, one end of a first resistor R2 is connected with one end of a second resistor R, the negative power input end 4 pin of the operational amplifier A3, the emitter of the NPN triode Q1 and the negative control power input end of the relay K1, the other end of the first adjustable resistor RP3 is connected with the reverse input end 2 pin of the operational amplifier A3, the other end of the first resistor R2 is connected with the same direction input end 3 pin of the operational amplifier A3, and the other end of the second resistor R2 is connected. The high-voltage detection circuit comprises an operational amplifier A, adjustable resistors RP4 and RP, resistors R3 and R4, a PNP triode Q and a relay K which are connected through circuit board wiring, wherein the positive electrode control power supply input end of the relay K is connected with the positive electrode power supply input end 7 pin of the operational amplifier A, one end of a first adjustable resistor RP, the emitter of the PNP triode Q2 is connected, the output end 6 pin of the operational amplifier A is connected with the base of the PNP triode Q, the collector of the PNP triode Q is connected with the positive electrode power supply input end of the relay K, one end of the first resistor R4 is connected with one end of the second resistor R3, the negative electrode power supply input end 4 pin of the operational amplifier A, the negative electrode control power supply input end of the relay K and the negative electrode power supply input end, the other end of the first adjustable resistor RP is connected with the reverse input end 2 pin of the operational amplifier A, the other end of the first resistor R4 is connected with the homodromous input end 3 pin of the operational amplifier A, and the other end of the second adjustable resistor RP4 is connected with the same end of the operational amplifier A. One normally open contact end of a relay K1 of the low detection circuit is connected in series through two wiring ends of a power switch S1 and one power input end of a motor speed reducing mechanism M through a wire, one normally open contact end of the relay K of the high detection circuit is connected in series through two wiring ends of the power switch S2 and the other power input end of the motor speed reducing mechanism M through a wire, and two ends of the power input end of the motor speed reducing mechanism M are connected with an indicator lamp B in parallel. The positive electrode of the lithium storage battery G1 is connected with the negative electrode of a diode VD2 through a lead.

As shown in fig. 1, 2 and 3, two ends of a primary winding of a transformer T and two poles of an ac 220V power supply are respectively connected by wires, two ends of a secondary winding of the transformer T and 1 and 2 pins of a power input end rectifier bridge stack A1 of a primary voltage stabilizing circuit are respectively connected by wires, two ends of a power output end capacitor C4 of the primary voltage stabilizing circuit are respectively connected with 7 and 4 pins of a power input end operational amplifier A3 of a low voltage detection circuit, 7 and 4 pins of a power input end operational amplifier a of a high voltage detection circuit, and the positive electrode of a diode VD2 and the negative electrode of a lithium storage battery G1 by wires. The other end of the adjustable resistor RP2 at the signal input end of the low voltage detection circuit, the other end of the adjustable resistor RP4 at the signal input end of the high voltage detection circuit and the anode of the lithium storage battery G1 are respectively connected through wires. The two terminals of the adjustable resistor ARP1 are connected in series between the other ends of the two signal input end resistors R1 of the primary voltage stabilizing circuit and the negative electrode of the capacitor C3 through wires, and the two normally open contact ends of the power output end relay K1 of the low voltage detection circuit, the two normally open contact ends of the power output end relay K of the high voltage detection circuit and the positive and negative electrode power input ends of the motor speed reducing mechanism M are respectively connected through wires.

Fig. 1, 2 and 3 show that in the present utility model, the power input end of the electric equipment or the storage battery to be charged and the two ends of the capacitor C4 are respectively connected by wires. The 220V alternating current commercial power is reduced by a transformer T (about 36V), rectified by a rectifier bridge stack A1 and then output to a post-stage circuit (filtering action of capacitors C1 and C2); after the 36V direct current power supply enters the three-terminal integrated voltage stabilizer A2, the three-terminal integrated voltage stabilizer A2 outputs a stable direct current power supply (such as 12.7V) to a post-stage high-voltage detection circuit, a low-voltage detection circuit, a storage battery G1 and a power input end of electric equipment under the action of an internal circuit of the three-terminal integrated voltage stabilizer A2 (the 12V power supply is unidirectionally conducted into the storage battery G1 through a diode VD2, and the power voltage output by the storage battery G1 is constant and cannot flow back to the high-voltage and low-voltage detection circuit). Specifically, under the action of an internal circuit of the three-terminal integrated voltage stabilizer A2, a production technician can adjust the voltage output by the three-terminal integrated voltage stabilizer A2 to meet the actual requirement by adjusting the resistance value of the adjustable resistor ARP1 in advance (the resistance value is adjusted and then the lower ends of the power output shafts of the handle and the motor speed reducing mechanism are welded together); the capacitor C3 is used to eliminate the ripple on the adjustable resistor ARP1, improve the stability of the output of the power supply voltage, the capacitor C4 is used to prevent the output end of the three-terminal integrated voltage regulator A2 from generating self-excitation, and the diodes VD1 and VD2 are used to prevent the charge accumulated in the load of the capacitive electric equipment from discharging to the three-terminal integrated voltage regulator A2 and causing damage (the resistor R1 and the adjustable resistor RP1 are divided into the adjustment end 1 pin of the three-terminal integrated voltage regulator A2 to input the reference voltage signal) when the power supply input end and the power supply output end are in extreme conditions.

As shown in fig. 1, 2 and 3, after the voltage of the low detection circuit is turned on, the power output by the three-terminal integrated voltage stabilizer A2 is divided by the adjustable resistor RP3 and the resistor R2 and enters the pin 2 of the reverse input end of the operational amplifier A3, and the power output by the storage battery G1 is divided by the adjustable resistor RP2 and the resistor R and enters the pin 3 of the same-direction input end of the operational amplifier A3. Under normal conditions, when the three-terminal integrated voltage stabilizer A2 and peripheral elements (the capacitors C1, C2, C3, C4 and the resistor R1, the adjustable resistor ARP1 and the diodes VD1 and VD) do not have any faults, the voltage (such as 6V) of the 2 pins entering the operational amplifier A3 is higher than the voltage (such as 5.99V) of the 3 pins, the 6 pins of the operational amplifier A3 output low level, the relay K1 cannot be electrified and closed, and the motor reducing mechanism M cannot work electrically. When any fault occurs in the three-terminal integrated voltage stabilizer A2 or one or more peripheral elements, the voltage output by the three-terminal integrated voltage stabilizer A2 is reduced, the voltage (such as 5.98V) of the 2-pin voltage input into the operational amplifier A3 is lower than the voltage of the 3-pin voltage (the storage battery G1 is not stable in fault voltage, unless the storage battery in the extreme case also fails, the subsequent compensatory voltage regulation is inaccurate, and the extreme case is not in the consideration range of the utility model, the utility model provides a voltage regulator which is realized in comparison with the prior art, wherein the 6-pin output high level of the operational amplifier A3 enters the base of the NPN triode Q1, the NPN triode Q1 conducts the collector output low level to enter the negative electrode power input end of the relay K1, the relay K1 is electrified to attract the control power input end and the normally open contact end of the relay, and the power output shaft of the motor speed reducing mechanism M is electrified to drive the handle of the adjustable resistor ARP1 to rotate clockwise to the resistance and the voltage division voltage between the resistor R1 to be amplified (the regulation signal input end 1 pin of the three-terminal regulator A2 is regulated), and the output voltage of the three-terminal integrated voltage stabilizer A2 is gradually changed. When the voltage output by the three-terminal integrated voltage stabilizer A2 is changed to be high again and the voltage of the 2 pins entering the operational amplifier A3 is higher than 6V, the 6 pins of the operational amplifier A3 stop outputting the high level again, then the relay K1 is powered down again, the motor speed reducing mechanism M is powered down and does not work, and the regulation of the excessively low voltage to the normal flow is completed.

After the voltage detection circuit is powered on, as shown in fig. 1, 2 and 3, the power output by the three-terminal integrated voltage stabilizer A2 is divided by the adjustable resistor RP and the resistor R4 and enters the pin 2 of the reverse input end of the operational amplifier A3, and the power output by the storage battery G1 is divided by the adjustable resistor RP4 and the resistor R1 and enters the pin 3 of the same-direction input end of the operational amplifier a. Under normal conditions, when the three-terminal integrated voltage stabilizer A2 and peripheral elements do not have any faults, the voltage (such as 5.99V) of the 2 pins entering the operational amplifier A3 is lower than the voltage (such as 6V) of the 3 pins, the 6 pins of the operational amplifier A3 output high level, the relay K cannot be electrified and attracted, and the motor reducing mechanism M cannot work electrically. When any fault occurs in the three-terminal integrated voltage stabilizer A2 or one or more peripheral elements, the voltage output by the three-terminal integrated voltage stabilizer A2 rises, the voltage (such as 6.01V) of the 2-pin input of the operational amplifier A3 is higher than the voltage of the 3-pin input, the low level output by the 6-pin input of the operational amplifier A3 enters the base electrode of the PNP triode Q, the collector output low level of the PNP triode Q is conducted and enters the negative electrode power input end of the relay K, the relay K is electrified to attract the control power input end of the relay K to be closed with the normally open contact end, the power output shaft of the motor reducing mechanism M is electrified, the handle of the motor reducing mechanism drives the adjustable resistor ARP1 to rotate anticlockwise, the voltage division between the resistor R1 is reduced (the adjusting signal entering the 1-pin of the adjusting end of the three-terminal integrated voltage stabilizer A2 is reduced), and the output voltage of the three-terminal integrated voltage stabilizer A2 is gradually reduced. When the voltage output by the three-terminal integrated voltage stabilizer A2 (model LM 317) becomes low again and the voltage of the 2 pins of the input operational amplifier A3 is lower than 5.99V again, the 6 pins of the operational amplifier A stop outputting high level again, then the relay K is powered down again, the motor reducing mechanism M is powered down and does not work, and the over-high voltage regulation to a normal flow is completed. Through the above, the utility model discloses can be with output voltage steady voltage differential between 0.02V, guaranteed output power voltage and electric current as far as possible invariable (the electric current of this novel transformer output is invariable, consequently mainly adjust output voltage steady just can reach constant voltage constant current output power supply), in the actual conditions, motor reduction gears M gets the time of electricity, pilot lamp B (display interface is located the component box front end trompil outside, be ordinary 5W incandescent lamp) also can get the electricity and give out light, use this to watch after giving out light like this, just so can understand directly perceivedly that three terminal integrated voltage regulator A2 or one or more of them peripheral original paper has failed, in time maintain or change, the probability that the consumer damaged has been reduced.

Fig. 1, 2, 3 show, in this novel, under extreme conditions, when motor reduction gears M drives adjustable resistance ARP1 'S handle and rotates to left dead center or right dead center, the baffle can contact switch S1 or S2' S button respectively, then two inside contacts of switch S1 or S2 open circuit, because relay K1 wherein normally open contact end is established ties through two wiring ends of switch S1 and one of them power input end of motor reduction gears is connected through the wire, relay K wherein normally open contact end is established ties through two wiring ends of switch S2 and another power input end of motor reduction gears is connected through the wire, therefore, when adjustable resistance ARP1 'S handle rotates to left dead center or right dead center, motor reduction gears M can lose electricity and do not work (only reverse input power supply just works), adjustable resistance ARP 1' S handle rotation angle has been prevented to surpass 360 degrees and has been caused adjustable resistance ARP1 to damage. In fig. 3, the relay K, K model number 1 is DC12V; the transformer T is a finished transformer product for converting 220V alternating current into 40V alternating current and having power of 50W; the model A1 of the rectifier bridge pile is KBP301; the model numbers of the diodes VD, VD1 and VD2 are 1N4007; the model Q1 of the NPN triode is 9013; the model Q2 of the PNP triode is 9012; the model A3 and model A of the operational amplifier are UA741; the types of the capacitors C1 and C3 are 470 mu F/50V and 20 mu F/50V respectively; the specifications of the capacitors C2 and C4 are 0.1 mu F; the resistances of the resistors R1, R, R2, R3 and R4 are 120 omega, 10K and 10K respectively; battery G1 is a lithium battery of model 12V/2 Ah; the model RP1 of the adjustable resistor is 4.7K; the adjustable resistors RP2, RP3, RP4 and RP are 47K (respectively adjusted to about 10K, 10.1K, 10K and 10.1K); the motor speed reducing mechanism M is a finished product of a coaxial motor gear reducer with working voltage of 12.7V and power of 5W, and the rotating speed of a power output shaft is 6 revolutions per minute.

The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims

1. The constant-current power supply with the precise voltage function comprises a transformer, a storage battery and a motor speed reducing mechanism, and is characterized by further comprising a primary voltage stabilizing circuit, a high-voltage detection circuit and a low-voltage detection circuit; the primary voltage stabilizing circuit is matched with an adjustable resistor A, a transformer, a lithium storage battery, a primary voltage stabilizing circuit, a voltage detecting circuit and an adjustable resistor A are arranged in the element box, a supporting frame is arranged at the side end of the adjustable resistor A, a motor speed reducing mechanism is arranged at the upper part of the inner side end of the supporting frame, the lower end of a power output shaft is arranged together with the upper side end of an adjusting handle of the adjustable resistor A, a fixing plate is arranged at the side end of a shell of the adjustable resistor A, a power switch is respectively arranged at the front end and the rear end of the fixing plate, and a baffle is arranged at one side of the lower end of the power output shaft; the power output end of the primary voltage stabilizing circuit is electrically connected with the voltage detecting circuit, the voltage detecting circuit and the power input end of the lithium storage battery respectively, and the signal input ends of the voltage detecting circuit and the voltage detecting circuit are electrically connected with the power output end of the lithium storage battery; the two terminals of the adjustable resistor A are electrically connected in series between the two signal input ends of the primary voltage stabilizing circuit, and the power output ends of the voltage detecting circuit and the voltage detecting circuit are electrically connected with the power input end of the motor speed reducing mechanism.

2. The precision voltage-enabled constant current power supply of claim 1, wherein the power switch is a normally closed contact power switch.

3. The constant current power supply with precise voltage function according to claim 1, wherein the primary voltage stabilizing circuit comprises an electrically connected three-terminal integrated voltage stabilizer, a diode, a rectifier bridge stack, an electrolytic capacitor, a ceramic chip capacitor and a resistor, wherein a power input end of the three-terminal integrated voltage stabilizer is connected with a first diode cathode, a first electrolytic capacitor anode, a first ceramic chip capacitor end and a positive power output end of the rectifier bridge stack, a power output end of the three-terminal integrated voltage stabilizer is connected with one end of the resistor, a first diode anode, a second diode cathode and a second ceramic chip capacitor end, the first electrolytic capacitor cathode is connected with the other end of the first ceramic chip capacitor, the second electrolytic capacitor cathode, the second ceramic chip capacitor end and a negative power output end of the rectifier bridge stack, and the other end of the resistor is connected with an adjusting end of the three-terminal integrated voltage stabilizer and the positive electrode of the second electrolytic capacitor.

4. The constant current power supply with precise voltage function according to claim 1, wherein the low detection circuit comprises an operational amplifier, an adjustable resistor, a resistor, an NPN triode and a relay which are electrically connected, wherein a positive power supply input end and a positive control power supply input end of the relay are connected with a positive power supply input end of the operational amplifier, one end of a first adjustable resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPN triode is connected with a negative power supply input end of the relay, one end of the first resistor is connected with one end of a second resistor, a negative power supply input end of the operational amplifier, an emitter of the NPN triode and a negative control power supply input end of the relay, the other end of the first adjustable resistor is connected with a reverse input end of the operational amplifier, the other end of the first resistor is connected with the other end of the second adjustable resistor, and the other end of the same direction input end of the operational amplifier is connected with the other end of the second resistor.

5. The constant current power supply with precise voltage function according to claim 1, wherein the high-voltage detection circuit comprises an operational amplifier, an adjustable resistor, a PNP triode and a relay which are electrically connected, wherein the positive electrode control power supply input end of the relay is connected with the positive electrode power supply input end of the operational amplifier, one end of a first adjustable resistor and the emitter of the PNP triode, the output end of the operational amplifier is connected with the base of the PNP triode, the collector of the PNP triode is connected with the positive electrode power supply input end of the relay, one end of the first resistor is connected with one end of a second resistor, the negative electrode power supply input end of the operational amplifier, the negative electrode control power supply input end of the relay and the negative electrode power supply input end of the relay, the other end of the first adjustable resistor is connected with the reverse input end of the operational amplifier, and the other end of the second adjustable resistor is connected with the same-direction input end of the operational amplifier.

6. The constant current power supply with precise voltage function according to claim 1, wherein one normally open contact end of the relay of the low voltage detection circuit and the relay of the high voltage detection circuit are respectively connected in series through two power switches and are respectively and electrically connected with two power input ends of the motor speed reducing mechanism, and the two power input ends of the motor speed reducing mechanism are connected with an indicator lamp in parallel.