A low voltage wide range input AC voltage stabilizer and use method

Abstract

The invention discloses an AC voltage stabilizer with low voltage and wide input range. The number of coil turns of the outer coil winding is designed to be more than that of the inner coil winding, so as to ensure that the output voltage can be stabilized at a lower input voltage. The minimum input voltage can reach 90V or even 50V, which greatly broadens the lower limit of the input voltage, breaks the bottleneck of the minimum input voltage of 160V of the ordinary voltage stabilizer, and realizes the low voltage voltage stabilization function. At the same time, a switching tap is added to the outer coil winding, so as to increase the upper limit of the input voltage, such as increasing the upper limit of the input voltage from 250V to 300V, so as to ensure the stability of the output voltage during the step-down output. The function of the shutdown reset circuit is to make the carbon brush assembly stay on the outer coil winding close to the farthest coil after shutdown, so as to ensure that the input resistance of the voltage stabilizer is at the maximum value when the power is turned on, so as to reduce the startup inrush current and reduce the impact on the voltage stabilizer when the power is turned on.

Description

Technical Field

[0001] The invention belongs to the technical field of AC voltage stabilizers, and in particular relates to an AC voltage stabilizer with low voltage and wide range input and a use method thereof. Background Art

[0002] The automatic AC voltage stabilizer is a closed-loop control system composed of a specially designed voltage regulator or transformer and a controller or control circuit. The servo motor drives the carbon brush assembly to automatically adjust its position on the outer coil winding of the contact voltage regulator or transformer to achieve the purpose of outputting a stable voltage. The current standard input voltage range of the voltage stabilizer industry is generally single-phase 160~250V (three-phase 280~430V), but due to power shortages in some areas, the input voltage is lower than this range, causing electrical equipment to fail to work normally, which restricts the application of automatic AC voltage stabilizers. Summary of the invention

[0003] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides an AC voltage stabilizer with low voltage and wide input range and a use method thereof.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: an AC voltage stabilizer with low voltage and wide range input, including a voltage regulating transformer, a carbon brush assembly compatible with the coil winding of the voltage regulating transformer, a reduction motor driving the carbon brush assembly, a first voltage regulating controller, a first output controller and a control system, wherein the voltage regulating transformer is an autotransformer, and an inner coil winding and an outer coil winding are wound on its high permeability core, the inner coil winding and the outer coil winding are connected in series to form the coil winding of the voltage regulating transformer, and the ratio of the number of coil turns of the inner coil winding to the number of coil turns of the outer coil winding is 1:5-6, the carbon brush assembly is compatible with the outer coil winding, and a 220V first tap and a 220V second tap are provided on the outer coil winding, the ratio of the number of coil turns at the 220V first tap to the total number of coil turns of the coil winding is 22:25, and the ratio of the number of coil turns at the 220V second tap to the total number of coil turns of the coil winding is 22:25. The number of turns is 10% less than the number of turns of the coil at the first tap of 220V. The first tap of 220V and the second tap of 220V are connected to the 220V output line via the first voltage regulating controller. The first output controller is provided on the 220V output line. The control system includes a power supply circuit, a shutdown reset circuit, a sampling circuit, a reference circuit, a main control circuit, a motor drive circuit, a voltage regulating circuit and a protection circuit. The shutdown reset circuit includes a storage capacitor. The induction coil of the power supply circuit is wound on the high-permeability core of the voltage regulating transformer. The power supply circuit is respectively connected to the shutdown reset circuit, the sampling circuit and the reference circuit. The shutdown reset circuit, the sampling circuit and the reference circuit are respectively connected to the main control circuit. The main control circuit is respectively connected to the motor drive circuit, the voltage regulating circuit and the protection circuit. The motor drive circuit is connected to the reduction motor. The voltage regulating circuit is connected to the first voltage regulating controller. The protection circuit is connected to the first output controller.

[0005] Preferably, the outer coil winding is also provided with a 110V first tap and a 110V second tap, the ratio of the number of coil turns at the 110V first tap to the total number of coil turns of the coil winding is 11:25, the number of coil turns at the 110V second tap is 10% less than the number of coil turns at the 110V first tap, the 110V first tap and the 110V second tap are connected to the 110V output line via a second voltage regulating controller, a second output controller is provided on the 110V output line, the second voltage regulating controller is connected to the voltage regulating circuit, the second output controller is connected to the protection circuit and is linked with the first output controller.

[0006] The above-mentioned low-voltage wide-range input AC voltage stabilizer has the following usage method: before starting up, the carbon brush assembly stays on the coil closest to the farthest end of the outer coil winding. After starting up, the power supply circuit obtains the induced voltage through the induction coil to provide power to the control system. The energy storage capacitor in the shutdown reset circuit starts to charge. The sampling circuit samples the input voltage in real time through the power supply circuit and transmits the sampling signal to the main control circuit. The reference circuit generates a stable reference voltage to provide a reference signal to the main control circuit. The main control circuit analyzes the sampling signal in real time and compares it with the reference signal, and then outputs a control signal to the motor drive circuit, the voltage regulating circuit or the protection circuit. When the input voltage is too low, the main control circuit outputs a control signal to the motor drive circuit. The motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the proximal coil of the outer coil winding and stay on the coil at an appropriate position of the outer coil winding. The 220V output line is connected to the 220V first tap via the first voltage regulating controller, and the 110V output line is connected to the 110V first tap via the second voltage regulating controller. When the input voltage is too low, the main control circuit outputs a control signal to the motor drive circuit. The motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the proximal coil of the outer coil winding and stay on the coil at an appropriate position of the outer coil winding. The 220V output line is connected to the 220V first tap via the first voltage regulating controller, and the 110V output line is connected to the 110V first tap via the second voltage regulating controller. When the voltage is too high, the main control circuit outputs a control signal to the motor drive circuit, and the motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the coil at the appropriate position of the outer coil winding. After the carbon brush assembly stays at the farthest coil of the outer coil winding, if the input voltage still increases and is higher than 270V, the main control circuit outputs a control signal to the voltage regulating circuit, and the voltage regulating circuit drives the first voltage regulating controller to connect to the second tap of 220V, and drives the second voltage regulating controller to connect to the second tap of 110V to ensure stable output; when the input voltage is abnormal, the main control circuit outputs a control signal to the protection circuit, and the protection circuit drives the first output controller and the second output controller to disconnect the output. After shutdown, the input voltage is 0, and the shutdown reset circuit outputs a control signal to the main control circuit. The main control circuit outputs a control signal to the motor drive circuit, and the energy storage capacitor discharges to drive the reduction motor to rotate, driving the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the farthest coil of the outer coil winding, waiting for the next startup.

[0007] The present invention designs the number of coil turns of the outer coil winding to be more than the number of coil turns of the inner coil winding, which can ensure that the output can still be stabilized at a lower input voltage. The minimum input voltage can reach 90V or even 50V, which greatly broadens the lower limit of the input voltage, breaks the bottleneck of the minimum input voltage of 160V of ordinary voltage stabilizers, and realizes the low voltage voltage stabilization function; at the same time, the present invention also adds a switching tap on the outer coil winding, which can increase the upper limit of the input voltage, such as increasing the upper limit of the input voltage from 250V to 300V, ensuring the stability of the output voltage during step-down output; the function of the shutdown reset circuit is to make the carbon brush assembly stay on the outer coil winding close to the farthest coil after shutdown, ensuring that the input resistance of the voltage stabilizer is at the maximum value when the power is turned on, which can reduce the startup inrush current and reduce the impact on the voltage stabilizer when the power is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the present invention.

[0009] In the figure, 1, outer coil winding, 2, inner coil winding, 3, induction coil, 4, control system, 5, 220V first tap, 6, 220V second tap, 7, 110V first tap, 8, 110V second tap, 9, 220V output line, 10, 110V output line, T, voltage regulating transformer, TC, carbon brush assembly, M, reduction motor, J1-1, first voltage regulating controller, J1-2, second voltage regulating controller, J2-1, first output controller, J2-2, second output controller. DETAILED DESCRIPTION

[0010] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0011] Example: See Figure 1A low-voltage wide-range input AC voltage stabilizer includes a voltage regulating transformer, a carbon brush assembly adapted to the coil winding of the voltage regulating transformer, a reduction motor driving the carbon brush assembly, a first voltage regulating controller, a first output controller and a control system. The voltage regulating transformer is an autotransformer, and an inner coil winding and an outer coil winding are wound on its high-permeability core. The inner coil winding and the outer coil winding are connected in series to form the coil winding of the voltage regulating transformer, and the ratio of the number of coil turns of the inner coil winding to the number of coil turns of the outer coil winding is 1:5-6. The carbon brush assembly is adapted to the outer coil winding. A 220V first tap and a 220V second tap are provided on the outer coil winding. The ratio of the number of coil turns at the 220V first tap to the total number of coil turns of the coil winding is 22:25, and the number of coil turns at the 220V second tap is 220V. The number of coil turns is reduced by 10%, the 220V first tap and the 220V second tap are connected to the 220V output line via the first voltage regulating controller, the 220V output line is provided with a first output controller, the control system comprises a power supply circuit, a shutdown reset circuit, a sampling circuit, a reference circuit, a main control circuit, a motor drive circuit, a voltage regulating circuit and a protection circuit, wherein the shutdown reset circuit comprises an energy storage capacitor, the induction coil of the power supply circuit is wound on the high permeability core of the voltage regulating transformer, the power supply circuit is respectively connected to the shutdown reset circuit, the sampling circuit and the reference circuit, the shutdown reset circuit, the sampling circuit and the reference circuit are respectively connected to the main control circuit, the main control circuit is respectively connected to the motor drive circuit, the voltage regulating circuit and the protection circuit, the motor drive circuit is connected to the reduction motor, the voltage regulating circuit is connected to the first voltage regulating controller, and the protection circuit is connected to the first output controller. Among them, the outer coil winding is also provided with a 110V first tap and a 110V second tap, the ratio of the number of coil turns at the 110V first tap to the total number of coil turns of the coil winding is 11:25, the number of coil turns at the 110V second tap is 10% less than the number of coil turns at the 110V first tap, the 110V first tap and the 110V second tap are connected to the 110V output line via a second voltage regulating controller, a second output controller is provided on the 110V output line, the second voltage regulating controller is connected to the voltage regulating circuit, the second output controller is connected to the protection circuit and is linked with the first output controller.

[0012] The above-mentioned low-voltage wide-range input AC voltage stabilizer has the following usage method: before starting up, the carbon brush assembly stays on the coil closest to the farthest end of the outer coil winding. After starting up, the power supply circuit obtains the induced voltage through the induction coil to provide power to the control system. The energy storage capacitor in the shutdown reset circuit starts to charge. The sampling circuit samples the input voltage in real time through the power supply circuit and transmits the sampling signal to the main control circuit. The reference circuit generates a stable reference voltage to provide a reference signal to the main control circuit. The main control circuit analyzes the sampling signal in real time and compares it with the reference signal, and then outputs a control signal to the motor drive circuit, the voltage regulating circuit or the protection circuit. When the input voltage is too low, the main control circuit outputs a control signal to the motor drive circuit. The motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the proximal coil of the outer coil winding and stay on the coil at an appropriate position of the outer coil winding. The 220V output line is connected to the 220V first tap via the first voltage regulating controller, and the 110V output line is connected to the 110V first tap via the second voltage regulating controller. When the input voltage is too low, the main control circuit outputs a control signal to the motor drive circuit. The motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the proximal coil of the outer coil winding and stay on the coil at an appropriate position of the outer coil winding. The 220V output line is connected to the 220V first tap via the first voltage regulating controller, and the 110V output line is connected to the 110V first tap via the second voltage regulating controller. When the voltage is too high, the main control circuit outputs a control signal to the motor drive circuit, and the motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the coil at the appropriate position of the outer coil winding. After the carbon brush assembly stays at the farthest coil of the outer coil winding, if the input voltage still increases and is higher than 270V, the main control circuit outputs a control signal to the voltage regulating circuit, and the voltage regulating circuit drives the first voltage regulating controller to connect to the second tap of 220V, and drives the second voltage regulating controller to connect to the second tap of 110V to ensure stable output; when the input voltage is abnormal, the main control circuit outputs a control signal to the protection circuit, and the protection circuit drives the first output controller and the second output controller to disconnect the output. After shutdown, the input voltage is 0, and the shutdown reset circuit outputs a control signal to the main control circuit. The main control circuit outputs a control signal to the motor drive circuit, and the energy storage capacitor discharges to drive the reduction motor to rotate, driving the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the farthest coil of the outer coil winding, waiting for the next startup.

[0013] The present invention designs the number of coil turns of the outer coil winding to be more than the number of coil turns of the inner coil winding, which can ensure that the output can still be stabilized at a lower input voltage. The minimum input voltage can reach 90V or even 50V, which greatly broadens the lower limit of the input voltage, breaks the bottleneck of the minimum input voltage of 160V of ordinary voltage stabilizers, and realizes the low voltage voltage stabilization function; at the same time, the present invention also adds a switching tap on the outer coil winding, which can increase the upper limit of the input voltage, such as increasing the upper limit of the input voltage from 250V to 300V, ensuring the stability of the output voltage during step-down output; the function of the shutdown reset circuit is to make the carbon brush assembly stay on the outer coil winding close to the farthest coil after shutdown, ensuring that the input resistance of the voltage stabilizer is at the maximum value when the power is turned on, which can reduce the startup inrush current and reduce the impact on the voltage stabilizer when the power is turned on.

[0014] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. An AC voltage stabilizer with low voltage and wide input range, comprising a voltage regulating transformer, a carbon brush assembly adapted to the coil winding of the voltage regulating transformer, a reduction motor driving the carbon brush assembly, a first voltage regulating controller, a first output controller and a control system, characterized in that The voltage-regulating transformer is an autotransformer, and an inner coil winding and an outer coil winding are wound on its high-permeability core. The inner coil winding and the outer coil winding are connected in series to form the coil winding of the voltage-regulating transformer, and the ratio of the number of coil turns of the inner coil winding to the number of coil turns of the outer coil winding is 1:5-6. The carbon brush assembly is adapted to the outer coil winding. A 220V first tap and a 220V second tap are provided on the outer coil winding. The ratio of the number of coil turns at the 220V first tap to the total number of coil turns of the coil winding is 22:

25. The number of coil turns at the 220V second tap is 10% less than the number of coil turns at the 220V first tap. The 220V first tap and the 220V second tap are connected to the first voltage regulating controller via a first voltage regulating controller. 220V output line, a first output controller is arranged on the 220V output line, the control system comprises a power supply circuit, a shutdown reset circuit, a sampling circuit, a reference circuit, a main control circuit, a motor drive circuit, a voltage regulating circuit and a protection circuit, wherein the shutdown reset circuit comprises an energy storage capacitor, the induction coil of the power supply circuit is wound on the high magnetic permeability core of the voltage regulating transformer, the power supply circuit is respectively connected to the shutdown reset circuit, the sampling circuit and the reference circuit, the shutdown reset circuit, the sampling circuit and the reference circuit are respectively connected to the main control circuit, the main control circuit is respectively connected to the motor drive circuit, the voltage regulating circuit and the protection circuit, the motor drive circuit is connected to the reduction motor, the voltage regulating circuit is connected to the first voltage regulating controller, and the protection circuit is connected to the first output controller.

2. According to claim 1, a low voltage wide range input AC voltage stabilizer is characterized in that The outer coil winding is also provided with a 110V first tap and a 110V second tap, the ratio of the number of coil turns at the 110V first tap to the total number of coil turns of the coil winding is 11:25, the number of coil turns at the 110V second tap is 10% less than the number of coil turns at the 110V first tap, the 110V first tap and the 110V second tap are connected to the 110V output line via a second voltage regulating controller, a second output controller is provided on the 110V output line, the second voltage regulating controller is connected to the voltage regulating circuit, the second output controller is connected to the protection circuit and is linked with the first output controller.

3. A method for using the low voltage wide range input AC voltage stabilizer as claimed in claim 2, characterized in that The method of use is as follows: before starting up, the carbon brush assembly stays on the coil closest to the farthest end of the outer coil winding. After starting up, the power supply circuit obtains the induced voltage through the induction coil to provide power to the control system. The energy storage capacitor in the shutdown reset circuit begins to charge. The sampling circuit samples the input voltage in real time through the power supply circuit and transmits the sampling signal to the main control circuit. The reference circuit generates a stable reference voltage to provide a reference signal to the main control circuit. The main control circuit analyzes the sampling signal in real time and compares it with the reference signal, and then outputs a control signal to the motor drive circuit, the voltage regulating circuit or the protection circuit. When the input voltage is too low, the main control circuit outputs a control signal to the motor drive circuit. The motor drive circuit drives the reduction motor to rotate, driving the carbon brush assembly to move to the proximal coil of the outer coil winding and stay on the coil at an appropriate position of the outer coil winding. The 220V output line is connected to the 220V first tap via the first voltage regulating controller, and the 110V output line is connected to the 110V first tap via the second voltage regulating controller. When the input voltage is too high, the main control circuit Output control signal to the motor drive circuit, the motor drive circuit drives the reduction motor to rotate, drives the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the coil at the appropriate position of the outer coil winding. After the carbon brush assembly stays at the farthest coil of the outer coil winding, if the input voltage still increases and is higher than 270V, the main control circuit outputs control signal to the voltage regulating circuit, the voltage regulating circuit drives the first voltage regulating controller to connect to the second tap of 220V, and drives the second voltage regulating controller to connect to the second tap of 110V to ensure stable output; when the input voltage is abnormal, the main control circuit outputs control signal to the protection circuit, the protection circuit drives the first output controller and the second output controller to disconnect the output, after shutdown, the input voltage is 0, the shutdown reset circuit outputs control signal to the main control circuit, the main control circuit outputs control signal to the motor drive circuit, the energy storage capacitor discharges to drive the reduction motor to rotate, drives the carbon brush assembly to move to the far end coil of the outer coil winding, and stays on the farthest coil of the outer coil winding, waiting for the next startup.

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