阅读说明：本技术 抱闸控制电路及电梯控制系统 (Band-type brake control circuit and elevator control system ) 是由 康德会 于 2020-08-04 设计创作，主要内容包括：一种抱闸控制电路,包括整流电路、PWM方波输出电路以及场效应管。所述整流电路用于将市电转换成直流电压。所述PWM方波输出电路用于控制所述场效应管的通断以输出抱闸电压。所述抱闸控制电路还包括启动时间调节电路和抱闸电压调节电路。所述启动时间调节电路用于接收整流电路输出的直流电压,并输出使能信号至所述抱闸电压调节电路。所述抱闸电压调节电路根据所述使能信号调节所述PWM方波输出电路的输出参数。由于抱闸控制电路中的启动时间和抱闸电压都可以根据需要调节,无需更改电路设置或者修改软件程序,从而极大地提高了抱闸控制电路的兼容性。(A band-type brake control circuit comprises a rectifying circuit, a PWM square wave output circuit and a field effect tube. The rectification circuit is used for converting commercial power into direct-current voltage. The PWM square wave output circuit is used for controlling the on-off of the field effect tube to output band-type brake voltage. The band-type brake control circuit further comprises a starting time adjusting circuit and a band-type brake voltage adjusting circuit. The starting time adjusting circuit is used for receiving the direct-current voltage output by the rectifying circuit and outputting an enabling signal to the band-type brake voltage adjusting circuit. And the band-type brake voltage regulating circuit regulates the output parameters of the PWM square wave output circuit according to the enabling signal. Because the starting time and the band-type brake voltage in the band-type brake control circuit can be adjusted according to the needs, the circuit setting does not need to be changed or the software program does not need to be modified, and the compatibility of the band-type brake control circuit is greatly improved.)

1. The utility model provides a band-type brake control circuit, includes rectifier circuit, PWM square wave output circuit and field effect transistor, rectifier circuit is used for converting the commercial power into direct current voltage, PWM square wave output circuit is used for controlling the break-make of field effect transistor is in order to output band-type brake voltage, its characterized in that, band-type brake control circuit still includes start time regulating circuit and band-type brake voltage regulating circuit, start time regulating circuit is used for receiving the direct current voltage of rectifier circuit output to output enable signal extremely band-type brake voltage regulating circuit, band-type brake voltage regulating circuit basis enable signal adjusts PWM square wave output circuit's output parameter.

2. The band-type brake control circuit according to claim 1, wherein the start-up time adjusting circuit comprises a first shunt, an RC charging circuit and a first comparator, the dc voltage output by the rectifying circuit charges a capacitor of the RC charging circuit through the first shunt, a first input terminal of the first comparator is connected to the RC charging circuit, a second input terminal of the first comparator is connected to the first comparison voltage, and an output terminal of the first comparator is connected to the band-type brake voltage adjusting circuit.

3. The brake control circuit according to claim 1, wherein the brake voltage regulating circuit comprises a resistor voltage dividing circuit, the resistor voltage dividing circuit comprises a first variable resistor, and the brake voltage regulating circuit adjusts a resistance value of the first variable resistor according to the enable signal to output different reference voltages to the PWM square wave output circuit.

4. The band-type brake control circuit according to claim 1, further comprising a release time adjusting circuit, wherein the release time adjusting circuit is connected to the PWM square wave output circuit and the fet, and is configured to supply power to the fet and the PWM square wave output circuit when the band-type brake control circuit is powered down.

5. The band-type brake control circuit according to claim 4, wherein the release time adjusting circuit comprises an energy storage capacitor and a current limiting resistor, the energy storage capacitor is charged when the band-type brake control circuit is in normal operation, and the energy storage capacitor supplies power to the field effect transistor through the current limiting resistor when the band-type brake control circuit is powered off.

6. The band-type brake control circuit according to claim 1, further comprising a safety monitoring circuit, wherein the safety monitoring circuit is connected to the rectifying circuit and the field-effect transistor, and the safety monitoring circuit detects a current value output by the band-type brake control circuit and turns off the field-effect transistor when the current value exceeds a preset threshold value.

7. The brake control circuit according to claim 6, wherein the safety monitoring circuit comprises a second shunt, a signal amplifier and a second comparator, the dc voltage output by the rectifying circuit is output to a first input terminal of the second comparator through the second shunt, a second input terminal of the second comparator is connected to a second comparison voltage, and an output terminal of the second comparator is connected to the control terminal of the fet.

8. The band-type brake control circuit according to claim 7, further comprising a monitor signal output circuit, wherein the monitor signal output circuit comprises a relay, and wherein an output terminal of the second comparator is connected to a control terminal of the relay.

9. The band-type brake control circuit according to claim 1, wherein the PWM square wave output circuit comprises a PWM chip, and the PWM chip is configured to receive the reference voltage output by the band-type brake voltage regulating circuit and an enable signal output by the start-time regulating circuit, and output a PWM square wave signal.

10. The band-type brake control circuit according to claim 1, further comprising a voltage transformation circuit for transforming the dc voltage outputted from the start-time adjustment circuit into a power supply voltage of the PWM square-wave output circuit.

11. An elevator control system comprising a brake control circuit according to any one of claims 1 to 10.

Technical Field

The invention relates to the technical field of electromechanical control, in particular to a band-type brake control circuit and an elevator control system.

Background

The band-type brake control circuit is widely applied to occasions requiring motor band-type brake braking, such as motor driving, elevator control and the like. The band-type brake control circuit used in the market at present mainly comprises a rectifying circuit, a PWM square wave output circuit and a field effect tube. After the band-type brake control circuit is electrified, the rectifying circuit converts 220V alternating current voltage into direct current voltage, and the PWM square wave output circuit is used for controlling the field effect tube to be switched on and off, so that band-type brake voltage is output. After the parameters of the PWM square wave are determined, the output band-type brake voltage and the start time are also determined, and if the parameters need to be changed, the circuit parameter setting needs to be changed, which is complicated in process and poor in circuit compatibility.

Disclosure of Invention

Based on the above problems, embodiments of the present invention provide a band-type brake control circuit, where both the start time and the output band-type brake voltage can be adjusted as required.

The band-type brake control circuit provided by the embodiment of the invention comprises a rectifying circuit, a PWM square wave output circuit and a field effect tube. The rectification circuit is used for converting commercial power into direct-current voltage. The PWM square wave output circuit is used for controlling the on-off of the field effect tube to output band-type brake voltage. The band-type brake control circuit further comprises a starting time adjusting circuit and a band-type brake voltage adjusting circuit. The starting time adjusting circuit is used for receiving the direct-current voltage output by the rectifying circuit and outputting an enabling signal to the band-type brake voltage adjusting circuit. And the band-type brake voltage regulating circuit regulates the output parameters of the PWM square wave output circuit according to the enabling signal.

In the band-type brake control circuit provided by the implementation of the invention, the starting time adjusting circuit comprises a first current divider, an RC charging circuit and a first comparator. The direct-current voltage output by the rectifying circuit charges a capacitor of the RC charging circuit through the first shunt, and the first input end of the first comparator is connected with the RC charging circuit. The second input end of the first comparator is connected with a first comparison voltage, and the output end of the first comparator is connected with the band-type brake voltage regulating circuit. The first comparator is used for outputting an enable signal to the band-type brake voltage regulating circuit when the capacitor charging voltage is higher than the first comparison voltage.

In the band-type brake control circuit provided by the implementation of the invention, the band-type brake voltage regulating circuit comprises a resistance voltage dividing circuit. The resistance voltage division circuit comprises a first variable resistor, and the band-type brake voltage regulating circuit adjusts the resistance value of the first variable resistor according to the enabling signal so as to output different reference voltages to the PWM square wave output circuit.

The band-type brake control circuit provided by the embodiment of the invention further comprises a release time adjusting circuit. The release time adjusting circuit is connected with the PWM square wave output circuit and the field effect tube and used for supplying power to the field effect tube and the PWM square wave output circuit when the band-type brake control circuit is powered off.

In the band-type brake control circuit provided by the embodiment of the invention, the release time adjusting circuit comprises an energy storage capacitor and a current limiting resistor, when the band-type brake control circuit works normally, the energy storage capacitor is charged, and when the band-type brake control circuit is powered off, the energy storage capacitor supplies power to the field effect transistor through the current limiting resistor.

The band-type brake control circuit provided by the embodiment of the invention further comprises a safety monitoring circuit. The safety monitoring circuit is connected with the rectifying circuit and the field effect tube. The safety monitoring circuit detects the current value output by the band-type brake control circuit and closes the field effect tube when the current value exceeds a preset threshold value.

In the band-type brake control circuit provided by the implementation of the invention, the safety monitoring circuit comprises a second shunt, a signal amplifier and a second comparator. And the direct-current voltage output by the rectifying circuit is output to a first input end of the second comparator through the second shunt. The second input of the second comparator is connected to a second comparison voltage. And the output end of the second comparator is connected to the control end of the field effect transistor.

The band-type brake control circuit provided by the embodiment of the invention further comprises a monitoring signal output circuit. The monitoring signal output circuit comprises a relay. The relay is connected to the output end of the second comparator and used for outputting an alarm signal when the current value output by the band-type brake control circuit exceeds a preset threshold value.

In the band-type brake control circuit provided by the implementation of the invention, the PWM square wave output circuit comprises a PWM chip. The PWM chip is used for receiving the reference voltage output by the band-type brake voltage regulating circuit, receiving the enabling signal output by the starting time regulating circuit and outputting a PWM square wave signal.

The band-type brake control circuit provided by the implementation of the invention further comprises a voltage transformation circuit. The voltage transformation circuit is used for converting the direct-current voltage output by the starting time adjusting circuit into the power supply voltage of the PWM square wave output circuit.

In the band-type brake control circuit provided by the embodiment of the invention, the starting time adjusting circuit generates an enabling signal and outputs the enabling signal to the band-type brake voltage adjusting circuit. And the band-type brake voltage regulating circuit regulates the output parameters of the PWM square wave output circuit according to the enabling signal. Because the starting time and the brake voltage of the brake control circuit can be adjusted according to requirements, circuit setting does not need to be changed or software programs do not need to be modified, and the compatibility of the brake control circuit is greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a system block diagram of a band-type brake control circuit according to an embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a band-type brake control circuit according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the start-up time adjustment circuit in fig. 2.

Fig. 4 is a circuit schematic of the RC charging circuit and the first comparator of fig. 3.

Fig. 5 is a schematic diagram of the band-type brake voltage regulating circuit in fig. 2.

Fig. 6 is a circuit configuration diagram of the band-type brake voltage regulating circuit in fig. 5.

Fig. 7 is a schematic diagram of the release time adjustment circuit of fig. 2.

Fig. 8 is a schematic diagram of the safety monitoring circuit of fig. 2.

Fig. 9 is a schematic diagram of the monitoring signal output circuit in fig. 2.

Fig. 10 is a schematic diagram of the PWM square wave output circuit of fig. 2.

Fig. 11 is a schematic diagram of the transformer circuit in fig. 2.

Fig. 12 is a diagram of a band-type brake voltage waveform output by the band-type brake control circuit in fig. 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.