CN209994097U

CN209994097U - Voltage stabilizer with drive protection function

Info

Publication number: CN209994097U
Application number: CN201920704455.XU
Authority: CN
Inventors: 谭科亮; 谭雪亮
Original assignee: Shenzhen Xingke Rong Technology Co Ltd
Current assignee: Shenzhen Xingke Rong Technology Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-01-24
Anticipated expiration: 2029-05-17

Abstract

The utility model relates to a stabiliser with drive protect function. The voltage stabilizer is connected with a mains supply and comprises a driving circuit, a measuring circuit, a control circuit and a relay control circuit, wherein the control circuit is respectively connected with the measuring circuit and the relay control circuit, the driving circuit comprises a motor, the measuring circuit is used for measuring currents at two ends of the motor, and the control circuit is configured to be used for controlling the relay control circuit to disconnect the driving circuit when the currents at the two ends of the motor exceed a set value. The motor can be effectively prevented from being damaged by overlarge current flowing through two ends of the motor when the motor is stuck.

Description

Voltage stabilizer with drive protection function

Technical Field

The utility model relates to a stabiliser technical field especially relates to a stabiliser with drive protect function.

Background

The voltage stabilizer is a power supply circuit or power supply equipment capable of automatically adjusting output voltage, and is widely applied to places such as factories, schools, banks and the like which have high power supply requirement stability. Generally, a voltage regulator comprises a sampling circuit, a driving circuit and a control circuit, however, when a motor in the driving circuit in the conventional voltage regulator is jammed, the current in the driving circuit is easily over-high, and the motor is damaged.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can prevent effectively that drive circuit in the electric current too big causes the stabiliser that has drive protect function of damage to drive circuit in to the motor.

For realizing the purpose of the utility model, the utility model adopts the following technical scheme:

the utility model provides a stabiliser with drive protect function, links to each other with mains supply, including drive circuit, measuring circuit, control circuit and relay control circuit, control circuit respectively with measuring circuit relay control circuit links to each other, drive circuit includes the motor, measuring circuit is used for measuring the electric current at motor both ends, control circuit is configured to work as when the electric current at motor both ends exceeds the setting value through control relay control circuit disconnection drive circuit.

The voltage stabilizer with the driving protection function is connected with a mains supply and comprises a driving circuit, a measuring circuit, a control circuit and a relay control circuit, wherein the control circuit is respectively connected with the measuring circuit and the relay control circuit, the driving circuit comprises a motor, the measuring circuit is used for measuring the current at two ends of the motor, and the control circuit is configured to disconnect the driving circuit by controlling the relay control circuit when the current at two ends of the motor exceeds a set value. The motor can be effectively prevented from being damaged by overlarge current flowing through two ends of the motor when the motor is stuck.

In one embodiment, the relay control circuit comprises a first resistor, a triode, a relay and a first diode, the control circuit is connected with the base of the triode through the first resistor, the emitter of the triode is grounded, the collector of the triode is connected with the positive electrode of a power supply through the relay, and the first diode is connected with the relay in parallel.

In one embodiment, the driving circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a second diode and a capacitor, wherein the gate of the first field effect transistor, the gate of the second field effect transistor, the gate of the third field effect transistor and the gate of the fourth field effect transistor are respectively connected with the control circuit, the drain of the first field effect transistor is connected with the positive electrode of a power supply through the second diode and a first normally closed contact of the relay, the drain of the third field effect transistor is connected with the positive electrode of the power supply through a second normally closed contact of the relay, the emitter of the second field effect transistor and the emitter of the fourth field effect transistor are respectively grounded through the capacitor, the emitter of the first field effect transistor is connected with the drain of the second field effect transistor, and the emitter of the third field effect transistor is connected with the drain of the fourth field effect transistor, and two ends of the motor are respectively connected with the emitting electrode of the first field effect transistor and the emitting electrode of the third field effect transistor.

In one embodiment, the measurement circuit includes a second resistor, a third resistor, and a fourth resistor, a first end of the second resistor, a first end of the third resistor, and a first end of the fourth resistor are respectively connected to an emitter of the fourth fet, a second end of the second resistor, a second end of the third resistor, and a second end of the fourth resistor are respectively connected to ground, and an emitter of the fourth fet is connected to the control circuit.

In one embodiment, the voltage regulator further comprises a display circuit, and the control circuit is configured to control the display circuit to display current abnormality information when the current across the motor exceeds a set value.

In one embodiment, the field effect transistor is a MOS field effect transistor.

Drawings

FIG. 1 is a schematic diagram of a voltage regulator according to an embodiment;

FIG. 2 is a schematic diagram of a pin of the single chip microcomputer in an embodiment;

FIG. 3 is a schematic circuit diagram of a relay control circuit according to an embodiment;

FIG. 4a, FIG. 4B and FIG. 4C are schematic circuit diagrams of phase A, phase B and phase C driving circuits, respectively, according to an embodiment; fig. 5a, 5B and 5C are circuit schematic diagrams of a-phase, B-phase and C-phase level shift circuits in an embodiment.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1, the present embodiment provides a voltage regulator 100 with a drive protection function, connected to a mains supply 200, and including a driving circuit 110, a measuring circuit 120, a control circuit 130 and a relay control circuit 140, wherein the control circuit 130 is respectively connected to the measuring circuit 120 and the relay control circuit 140, the driving circuit 110 includes a motor, the measuring circuit 120 is used for measuring a current across the motor, and the control circuit 130 is configured to disconnect the driving circuit 110 by controlling the relay control circuit 140 when the current across the motor exceeds a set value.

It should be noted that the operating principle of the voltage regulator 100 provided in this embodiment is as follows: the control circuit 130 is connected with the mains supply 200, the driving circuit 110 is connected with the control circuit 130, and the control circuit 130 is used for sampling, comparing, amplifying and the like according to the voltage output by the mains supply 200, then the driving circuit 110 drives the motor to rotate, so that the position of the carbon brush of the voltage regulator is changed, and the coil turn ratio is automatically adjusted, so that the stability of the output voltage is kept. Specifically, referring to fig. 2, the control circuit 130 may be controlled by a single chip.

In the present embodiment, the voltage regulator 100 further includes a measurement circuit 120 and a relay control circuit 140, among others. The measuring circuit 120 is respectively connected to the driving circuit 110 and the control circuit 130, and is configured to measure currents at two ends of a motor in the driving circuit 110, and when the currents at the two ends of the motor are higher than a set value, the control circuit 130 sends a level signal; the relay control circuit 140 is connected to the control circuit 130, and the relay control circuit 140 energizes the relays in the relay control circuit 140 according to the level signal. Specifically, a relay contact in the relay control circuit 140 may be provided between the driving circuit 110 and the power source, and when the relay is powered, the connection between the driving circuit 110 and the power source is disconnected by controlling the relay contact, thereby stopping the current motor operation. The motor can be effectively prevented from being damaged by overlarge current flowing through two ends of the motor when the motor is stuck.

The voltage stabilizer 100 with the drive protection function is connected with a mains supply 200, and comprises a drive circuit 110, a measurement circuit 120, a control circuit 130 and a relay control circuit 140, wherein the control circuit 130 is respectively connected with the measurement circuit 120 and the relay control circuit 140, the drive circuit 110 comprises a motor, the measurement circuit 120 is used for measuring the current at two ends of the motor, and the control circuit 130 is configured to disconnect the drive circuit 110 by controlling the relay control circuit 140 when the current at two ends of the motor exceeds a set value. The motor can be effectively prevented from being damaged by overlarge current flowing through two ends of the motor when the motor is stuck.

In one embodiment, referring to fig. 3, the relay control circuit 140 includes a first resistor R1, a transistor Q1, a relay K1, and a first diode D1, the control circuit 130 is connected to the base of the transistor Q1 through the first resistor R1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the positive power supply through the relay K1, and the first diode D1 is connected in parallel to the relay K1.

In one embodiment, referring to fig. 4a, 4b and 4C, the driving circuit 110 includes a first fet Q2, a second fet Q3, a third fet Q4, a fourth fet Q5, a second diode D2 and a capacitor C1, the gate of the first fet Q2, the gate of the second fet Q3, the gate of the third fet Q4 and the gate of the fourth fet Q5 are respectively connected to the control circuit 130, the drain of the first fet Q2 is connected to the positive power supply via the second diode D2 and the first normally closed contact K11 of the relay, the drain of the third fet Q4 is connected to the positive power supply via the second normally closed contact K84 of the relay, the emitter of the second fet Q3 and the emitter of the fourth fet Q5 are respectively connected to the ground via the capacitor C45, the emitter of the first fet Q2 is connected to the drain of the second fet Q5, the emitter of the third fet Q5 is connected to the drain of the fourth fet Q57324, and two ends of the motor are respectively connected with the emitter of the first field effect transistor Q2 and the emitter of the third field effect transistor Q4. Specifically, the field effect transistor is a MOS field effect transistor.

In this embodiment, when the current across the motor is higher than the set value, the control circuit 130 outputs a high level signal, the relay of the relay control circuit 140 is powered on, and the normally closed contact of the relay is opened, so that the driving circuit 110 is disconnected from the power supply, and the current motor operation is stopped.

Further, referring to fig. 4a, 4B and 4C, the driving circuit 110 includes three-phase driving circuits, specifically, an a-phase driving circuit, a B-phase driving circuit and a C-phase driving circuit, and the circuit schematic diagram of each phase driving circuit is the same, except that the input port is connected to a different output port of the control circuit 140.

In one embodiment, the measurement circuit 120 includes a second resistor R2, a third resistor R3, and a fourth resistor R4, a first terminal of the second resistor R2, a first terminal of the third resistor R3, and a first terminal of the fourth resistor R4 are respectively connected to the emitter of the fourth fet Q5, a second terminal of the second resistor R2, a second terminal of the third resistor R3, and a second terminal of the fourth resistor R4 are respectively connected to ground, and the emitter of the fourth fet Q5 is connected to the control circuit 140.

In the present embodiment, the measurement circuit 120 is connected to the control circuit 140 for detecting the current across the motor, specifically, when the current across the motor exceeds 2A, it is determined that the motor is currently in a locked state.

In one embodiment, the voltage regulator 100 further includes a display circuit, and the control circuit 130 is configured to control the display circuit 150 to perform current abnormality information display when the current across the motor exceeds a set value.

In this embodiment, the display circuit 150 may adopt an LCD display screen, and when the current at the two ends of the motor exceeds 2A, the control circuit 130 is configured to control the display circuit 150 to display abnormal information, so as to remind an operator of a fault in time.

Further, referring to fig. 5a, 5B and 5C, the voltage regulator 100 further includes a level conversion circuit, which is respectively connected to the control circuit 130 and the driving circuit 110, and is configured to convert the 12V voltage required by the normal operation of the a-phase, B-phase and C-phase driving circuits 110 into the 3.3V voltage required by the normal operation of the control circuit 130.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a stabiliser with drive protect function, links to each other with mains supply, its characterized in that, including drive circuit, measuring circuit, control circuit and relay control circuit, control circuit respectively with measuring circuit relay control circuit links to each other, drive circuit includes the motor, measuring circuit is used for measuring the electric current at motor both ends, control circuit is configured to work as when the electric current at motor both ends surpasss the setting value through control relay control circuit disconnection drive circuit.

2. The voltage regulator according to claim 1, wherein the relay control circuit includes a first resistor, a transistor, a relay, and a first diode, the control circuit is connected to a base of the transistor through the first resistor, an emitter of the transistor is grounded, a collector of the transistor is connected to a positive power supply through the relay, and the first diode is connected in parallel to the relay.

3. The voltage stabilizer according to claim 1, wherein the driving circuit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a second diode, and a capacitor, a gate of the first field effect transistor, a gate of the second field effect transistor, a gate of the third field effect transistor, and a gate of the fourth field effect transistor are respectively connected to the control circuit, a drain of the first field effect transistor is connected to a positive electrode of a power supply through the second diode and a first normally closed contact of the relay, a drain of the third field effect transistor is connected to the positive electrode of the power supply through a second normally closed contact of the relay, an emitter of the second field effect transistor and an emitter of the fourth field effect transistor are respectively grounded through the capacitor, and an emitter of the first field effect transistor is connected to a drain of the second field effect transistor, and the emitter of the third field effect transistor is connected with the drain of the fourth field effect transistor, and two ends of the motor are respectively connected with the emitter of the first field effect transistor and the emitter of the third field effect transistor.

4. The voltage regulator according to claim 3, wherein the measurement circuit comprises a second resistor, a third resistor and a fourth resistor, a first end of the second resistor, a first end of the third resistor and a first end of the fourth resistor are respectively connected to an emitter of the fourth field effect transistor, a second end of the second resistor, a second end of the third resistor and a second end of the fourth resistor are respectively connected to ground, and an emitter of the fourth field effect transistor is connected to the control circuit.

5. The voltage regulator of claim 1, further comprising a display circuit, wherein the control circuit is configured to control the display circuit to display current anomaly information when the current across the motor exceeds a set value.

6. The voltage regulator of claim 3, wherein the field effect transistor is a MOS field effect transistor.