CN217428022U - Automatic load ratio adjusting system of energy-consuming brake unit - Google Patents

Automatic load ratio adjusting system of energy-consuming brake unit Download PDF

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CN217428022U
CN217428022U CN202221601226.3U CN202221601226U CN217428022U CN 217428022 U CN217428022 U CN 217428022U CN 202221601226 U CN202221601226 U CN 202221601226U CN 217428022 U CN217428022 U CN 217428022U
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周贵财
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The utility model discloses an energy dissipation braking unit automatically regulated load ratio system relates to the motor field, and this energy dissipation braking unit automatically regulated load ratio system includes: the power supply voltage reduction module is used for supplying power to the voltage stabilizing circuit; the voltage stabilizing circuit is used for supplying 15V and 5V voltage; the monitored voltage input module is used for monitoring input voltage and outputting a signal to the main control module; compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses when utilizing simple circuit to solve real time monitoring converter busbar voltage, because of the motor deceleration or the produced not equidimension's of parking voltage speed promotes, and changes the load power of braking unit, reaches the consumed power who alleviates brake spare IGBT and brake resistance, reduces operating temperature, reduces excessive energy consumption, owing to be the operation of monitoring of real-time, to the whole security of equipment, stability, validity etc. give effectual assurance.

Description

Automatic load ratio adjusting system of energy-consuming brake unit
Technical Field
The utility model relates to a motor field specifically is an energy consumption braking unit automatically regulated load ratio system.
Background
Referring to fig. 1, a three-phase 380V ac is first rectified in a bridge manner, and then passes through a soft control switch, the soft control switch is connected to a filter capacitor, and positive and negative points of the filter capacitor are bus voltage connection points, and are connected to a brake unit to detect whether the bus voltage of the frequency converter exceeds a set voltage range. When the frequency converter is started for a short time, the frequency converter is automatically closed, so that the frequency converter works at normal current, and three groups of IGBT switching tubes in the frequency converter output current according to set frequency by the inverter to drive the motor to rotate.
The energy consumption braking unit is characterized in that when the motor is in operation and the frequency converter controls the motor to change from high speed to low speed, because the motor running system is added with mechanical load, the sudden deceleration or stop can generate physical inertia rotation, so that the rotating speed of the motor is higher than the setting of the frequency converter, at this time, the motor will change from passive to active, i.e. will change into the generator state, and will generate the regenerated electric energy, the electric energy is converted into direct current voltage through the internal circuit of the frequency converter, the voltage pumps up the voltage at two ends of a capacitor in the frequency converter, the voltage will rise along with the speed of the motor and the set speed difference of the frequency converter, the bus voltage leading to the frequency converter exceeds the bearing voltage value of the equipment to alarm the pause or even damage the frequency converter and the related equipment, therefore, the extra regenerative electric energy is consumed, and the bus voltage is reduced in time to protect the frequency converter, and the protection function is formed by an energy consumption brake unit and a brake resistor of the frequency converter.
Since the regenerative electric energy is consumed, high power consumption and heat generation are generated on the brake resistor, and the consumed heat may cause the brake resistor to blow, and if the control is not proper, excessive power consumption waste is generated. When the existing energy-consuming brake unit of the frequency converter is operated, generally, when the bus voltage of the frequency converter rises to a brake starting threshold value, the IGBT of the power device is directly opened and is completely conducted until the bus voltage drops below the threshold voltage, and the IGBT is not turned off until the bus voltage drops below the threshold voltage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an energy consumption braking unit automatically regulated load ratio system to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an automatic load ratio adjustment system for a dissipative braking unit, comprising:
the power supply voltage reduction module is used for supplying power to the voltage stabilizing circuit;
the voltage stabilizing circuit is used for supplying 15V and 5V voltage;
the monitored voltage input module is used for monitoring input voltage and outputting a signal to the main control module;
a main control module for changing output PWM duty ratio according to the magnitude of the input signal and increasing the voltage rise speed according to the input signal
Changing the PWM starting period and outputting the PWM starting period to the IGBT driving module;
the IGBT driving module is used for driving the IGBT power tube;
the IGBT power tube is used for consuming electric energy on a bus of the frequency converter through the brake resistor during working so as to prevent the voltage of the bus from continuously rising;
the power supply low-voltage protection module is used for disconnecting the IGBT driving module when the power supply voltage on the IGBT driving module is lower than the VGE driving voltage of the IGBT tube;
the converter busbar voltage output is for being monitored voltage input module, power step-down module, and voltage stabilizing circuit, power low pressure protection module are connected to power step-down module, and main control module is connected to being monitored voltage input module, and voltage stabilizing circuit connects main control module, IGBT drive module, and main control module connects IGBT drive module, and power low pressure protection module connects IGBT drive module, and IGBT drive module connects the IGBT power tube, and the braking resistance is connected to the IGBT power tube.
As a further aspect of the present invention: the monitored voltage input module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a trimming resistor RX, wherein one end of the resistor R1 is connected with the voltage of the frequency converter bus, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with one end of a resistor R7, one end of the trimming resistor RX and the main control module, and the other end of the trimming resistor RX is grounded.
As a further aspect of the present invention: the main control module comprises a main control chip U1, a pin No. 1 of the main control chip U1 is connected with a voltage stabilizing circuit, a pin No. 2 of the main control chip U1 is connected with one end of a resistor R15, the other end of the resistor R15 is connected with the anode of a light emitting diode LED1, the cathode of the light emitting diode LED1 is grounded, a pin No. 5 of the main control chip U1 is connected with a monitoring voltage input module, a pin No. 6 of the main control chip U1 is connected with an IGBT driving module, a pin No. 8 of the main control chip U1 is grounded, and the main control chip U1 is an ADC 8-bit EPROM-Based MCU.
As the utility model discloses further scheme again: the IGBT driving module comprises a driving chip U2, a pin No. 2 of the driving chip U2 is connected with a pin No. 4 of the driving chip U2 and a pin No. 6 of the main control chip U1, a pin No. 3 of the driving chip U2 is grounded, a pin No. 7 of the driving chip U2 is connected with an IGBT power tube through a resistor R8, and a pin No. 8 of the driving chip U2 is connected with a low-voltage protection module.
As a further aspect of the present invention: the low-voltage protection module comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a diode ZD1, a diode ZD2 and a controllable precise voltage-stabilizing source TL, wherein one end of the resistor R9 is connected with the power supply voltage-reducing module, the other end of the resistor R9 is connected with one end of the resistor R12, the cathode of the controllable precise voltage-stabilizing source TL, the cathode of the diode ZD1 and the cathode of the diode ZD2, the other end of the resistor R12 is connected with one end of the resistor R11 and a voltage-stabilizing circuit, the other end of the resistor R11 is connected with one end of the resistor R10 and the reference pole of the controllable precise voltage-stabilizing source TL, the other end of the resistor R10 is grounded, the anode of the controllable precise voltage-stabilizing source TL is grounded, the anode of the diode ZD2 is grounded, and the anode of the diode ZD1 is connected with the IGBT driving module.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses when utilizing simple circuit to solve real time monitoring converter busbar voltage, because of the voltage lifting speed of the produced not equidimension of motor deceleration or parking, and change output PWM duty cycle and change PWM start-up period according to input signal voltage rising speed, reach the consumed power who alleviates brake spare IGBT and brake resistance, reduce operating temperature, reduce excessive energy resource consumption, because be the supervision operation of real-time, to the whole security of equipment, stability, validity etc. give effectual assurance.
Drawings
Fig. 1 is a schematic diagram of a frequency converter circuit.
FIG. 2 is a schematic diagram of a system for automatically adjusting the load ratio of a dissipative braking unit.
FIG. 3 is a circuit diagram of a system for automatically adjusting the load ratio of a dissipative braking unit.
FIG. 4 is a schematic diagram of the main control module outputting PWM automatically tracking voltage variation.
FIG. 5 is a logic diagram of a brake load proportional change condition after a brake unit activation threshold.
Fig. 6 is a schematic diagram of a low supply voltage protection threshold.
Fig. 7 is a schematic diagram of the low supply voltage protection threshold.
Detailed Description
The technical solution 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 some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative work belong to the scope of protection of the present invention based on the embodiments of the present invention.
Referring to fig. 2 and 3, an automatic load ratio adjusting system for a dissipative braking unit includes:
the power supply voltage reduction module is used for supplying power to the voltage stabilizing circuit;
the voltage stabilizing circuit is used for supplying 15V and 5V voltage;
the monitored voltage input module is used for monitoring input voltage and outputting a signal to the main control module;
a main control module for changing output PWM duty ratio according to the magnitude of the input signal and increasing the voltage rise speed according to the input signal
Changing the PWM starting period and outputting the PWM starting period to the IGBT driving module;
the IGBT driving module is used for driving the IGBT power tube;
the IGBT power tube is used for consuming electric energy on a bus of the frequency converter through the brake resistor during working so as to prevent the voltage of the bus from continuously rising;
the power supply low-voltage protection module is used for disconnecting the IGBT driving module when the power supply voltage on the IGBT driving module is lower than the VGE driving voltage of the IGBT tube;
the converter busbar voltage output is for being monitored voltage input module, power step-down module, and voltage stabilizing circuit, power low pressure protection module are connected to power step-down module, and main control module is connected to being monitored voltage input module, and voltage stabilizing circuit connects main control module, IGBT drive module, and main control module connects IGBT drive module, and power low pressure protection module connects IGBT drive module, and IGBT drive module connects the IGBT power tube, and the braking resistance is connected to the IGBT power tube.
In a specific embodiment: referring to fig. 3, the power supply voltage reduction module divides the voltage through resistors to complete voltage reduction processing on the introduced bus voltage of the frequency converter; the voltage stabilizing circuit obtains a voltage of 15V and a voltage of 5V through the voltage stabilizing diodes ZD3 and ZD2 respectively, supplies the voltage of 5V for the main control module and supplies the voltage of 15V for the IGBT driving module.
First condition (normal): when the motor is normally used as a load condition, because the rotating speed is synchronous with the frequency converter or when the rotating speed is increased, the speed is the same as or lower than the speed of the frequency converter, no regenerative electric energy is generated, the bus voltage of the energy-consuming braking unit of the frequency converter is about 540V (about 540V when 380V power voltage is used, 220V power voltage is reduced in proportion), and the bus voltage does not exceed the starting voltage value, so that the starting and stopping control point of the energy-consuming braking unit of the frequency converter does not output a control voltage signal to the IGBT driving module, the output of the IGBT driving module is 0, and the braking resistor does not generate consumed current.
Second condition (bus voltage rising): when the motor is decelerated or required to stop rotating, the rotating speed of the motor is changed to obviously fall behind the frequency converter, at the moment, the rotating speed of the motor is positively different from that of the frequency converter, regenerative electric energy is generated to pump up the voltage of an energy storage capacitor of the frequency converter, when the voltage rises and exceeds the absorption capacity of a filter capacitor in the frequency converter, the voltage still rises and reaches a starting threshold value set by a braking unit, the main control module starts to output a PWM signal to the IGBT driving module, so that the IGBT of the starting power is switched on, the bus current is consumed by a braking resistor to reduce the bus voltage, and the frequency converter is protected from overvoltage alarm.
Third condition (bus voltage ramp): when the motor is controlled to rapidly reduce the speed or suddenly brake, the regenerative electric energy generated by the motor can be greatly increased in a short time, so that the bus voltage can rapidly rise, the main control module can automatically adjust the PWM pulse output duty ratio when detecting that the bus voltage suddenly rises, and increase the conduction time, so that the conduction time of the power IGBT is increased, and the pulse interval time is properly shortened according to the current voltage change condition, so that more current is consumed through the brake resistor, and the bus voltage is accelerated to be reduced.
Fourth condition (when the bus voltage rises to the start-up threshold upper limit): when the voltage still rises and the chance of exceeding the alarm voltage value of the frequency converter exists, the main control module can automatically change from the PWM pulse output mode to the direct conduction mode, so that the IGBT is continuously conducted until the bus voltage drops to the lower limit of the threshold voltage, and the main module can automatically return to the PWM pulse mode to output and drive.
In this embodiment: referring to fig. 3, the monitored voltage input module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a trimming resistor RX, wherein one end of the resistor R1 is connected to the converter bus voltage, the other end of the resistor R1 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to one end of a resistor R3, the other end of the resistor R3 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to one end of a resistor R5, the other end of the resistor R5 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to one end of a resistor R7, one end of the trimming resistor RX, and the main control module, and the other end of the trimming resistor RX is grounded.
After the bus voltage of the frequency converter is divided into partial voltages by a resistor R1 and a resistor R7, the voltage on the resistor R7 is selected as the sampling voltage of the bus voltage and is output to the main control module.
In this embodiment: referring to fig. 3 and 4, the main control module includes a main control chip U1, pin 1 of the main control chip U1 is connected to the voltage regulator circuit, pin 2 of the main control chip U1 is connected to one end of a resistor R15, the other end of the resistor R15 is connected to the anode of a light emitting diode LED1, the cathode of the light emitting diode LED1 is grounded, pin 5 of the main control chip U1 is connected to the monitoring voltage input module, pin 6 of the main control chip U1 is connected to the IGBT drive module, pin 8 of the main control chip U1 is grounded, and the main control chip U1 is an ADC 8-bit EPROM-Based MCU.
The No. 5 pin of the main control chip U1 inputs sampling voltage, and through an analog/digital conversion function in the chip, when the sampling voltage reaches a starting voltage value set by the main control chip U1, the main control chip U1 outputs a pulse signal PWM to the power IGBT driving module. The IGBT driving module drives the IGBT power tube to be conducted according to PWM duty ratio time, electric energy on a bus of the frequency converter is consumed through the brake resistor until voltage drops, and the effect of preventing the bus voltage from continuously rising is achieved.
In this embodiment: referring to fig. 3 and 5, the IGBT driver module includes a driver chip U2, a pin 2 of the driver chip U2 is connected to a pin 4 of the driver chip U2 and a pin 6 of the main control chip U1, a pin 3 of the driver chip U2 is grounded, a pin 7 of the driver chip U2 is connected to the IGBT power transistor through a resistor R8, and a pin 8 of the driver chip U2 is connected to the low voltage protection module.
When the bus voltage starts to rise at a low voltage and rises to a starting threshold value set by the braking unit, the main control module starts to output a pulse signal of a first-stage duty ratio to the IGBT driving module according to the sampling voltage, so that the driving module drives the IGBT power tube to start to be switched on and off according to the duty ratio time of the pulse, when the output quantity of the regenerated electric energy of the motor is larger than the duty ratio time consumption quantity of the control switching-on of the braking unit, the bus voltage of the frequency converter continuously rises, at the moment, the main control module monitors the voltage rising speed and the voltage value to increase the duty ratio of PWM, the ratio is changed by referring to a braking load ratio change state logic table of figure 5, and the voltage value and the duty ratio in the table are different according to different models. The duty ratio changes with the voltage rising or falling to achieve the purpose of consuming appropriate power with the shortest on time and consuming low regenerative power with the fixed maximum full on consumption. Besides automatically adjusting the duty ratio, the main control module also monitors the rising speed of the bus voltage of the frequency converter to change the time interval of the starting pulse.
When the unit is in high load, the main control module takes about 6ms as a pulse period, and when the unit is in low load, the pulse period time is automatically adjusted according to the voltage of the bus at the time. When the bus voltage rises to be higher than the starting voltage by more than 15V, the PWM can be automatically adjusted to be directly conducted and work in the highest load state. The above time and the value higher than the starting voltage are set differently for different models.
In this embodiment: referring to fig. 3, 6 and 7, the low voltage protection module includes a resistor R9, a resistor R10, a resistor R11, a resistor R12, a diode ZD1, a diode ZD2 and a controllable precise voltage-stabilizing source TL, one end of the resistor R9 is connected to the power step-down module, the other end of the resistor R9 is connected to one end of the resistor R12, the cathode of the controllable precise voltage-stabilizing source TL, the cathode of the diode ZD1 and the cathode of the diode ZD2, the other end of the resistor R12 is connected to one end of the resistor R11 and the voltage-stabilizing circuit, the other end of the resistor R11 is connected to one end of the resistor R10 and the reference electrode of the controllable precise voltage-stabilizing source TL, the other end of the resistor R10 is grounded, the anode of the controllable precise voltage-stabilizing source TL is grounded, the anode of the diode ZD2 is grounded, and the anode of the diode ZD 36 1 is connected to the IGBT drive module.
In the normal condition, the voltage of the brake unit is increased to the working voltage value of the IGBT VGE, about 15V or 15V, during the starting process, in order to protect the IGBT drive module from mistakenly triggering an output pulse starting signal to an IGBT power tube due to insufficient voltage caused by environmental factors, human problems and other equipment interference, the IGBT is conducted under the low grid drive voltage VGE to be damaged, generally 13V is set as the lowest VGE starting voltage, therefore, a low voltage protection module is arranged, when the unit is initially started or the voltage is reduced to 13V or less than 13V from 15V in the using process (different device model selection possible differences), the controllable precise voltage-stabilizing source TL reference electrode voltage of the low voltage protection module is less than the reference value, TL is not conducted, and the No. 8 pin (SD function) of the drive chip U2 is changed from low level to high level, the driver chip U2 is directly turned off to stop the power IGBT from conducting until the voltage rises back to 13V or more.
The utility model discloses a theory of operation is: the power supply voltage reduction module supplies power for the voltage stabilizing circuit, the voltage stabilizing circuit supplies 15V and 5V voltage, the voltage input module monitors input voltage under monitoring, output signals are sent to the main control module, the main control module changes output PWM duty ratio according to the size of the input signals and outputs the output PWM duty ratio to the IGBT driving module, the IGBT driving module drives the IGBT power tube, when the IGBT power tube works, electric energy on a frequency converter bus is consumed through a brake resistor, the purpose of preventing the bus voltage from continuously rising is achieved, and the power supply low-voltage protection module is used for disconnecting the IGBT driving module when the voltage of the driving module is lower than the threshold voltage required by the IGBT.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A system for automatically adjusting the load ratio of a dissipative braking unit, comprising:
the automatic load ratio adjustment system for an dissipative braking unit comprises:
the power supply voltage reduction module is used for supplying power to the voltage stabilizing circuit;
the voltage stabilizing circuit is used for supplying 15V and 5V voltage;
the monitored voltage input module is used for monitoring input voltage and outputting a signal to the main control module;
a main control module for changing output PWM duty ratio according to the magnitude of the input signal and increasing the voltage rise speed according to the input signal
Changing the PWM starting period and outputting the PWM starting period to the IGBT driving module;
the IGBT driving module is used for driving the IGBT power tube;
the IGBT power tube is used for consuming electric energy on a bus of the frequency converter through the brake resistor during working so as to prevent the voltage of the bus from continuously rising;
the power supply low-voltage protection module is used for disconnecting the IGBT driving module when the power supply voltage on the IGBT driving module is lower than the VGE driving voltage of the IGBT tube;
the converter busbar voltage exports for being supervised voltage input module, power step-down module, and voltage stabilizing circuit, power low pressure protection module are connected to power step-down module, and the main control module is connected to the voltage input module of being supervised, and voltage stabilizing circuit connects main control module, IGBT drive module, and IGBT drive module is connected to main control module, and IGBT drive module is connected to power low pressure protection module, and IGBT power tube connects the brake resistance.
2. The system for automatically adjusting the load ratio of an energy consumption brake unit as claimed in claim 1, wherein the monitored voltage input module comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a trimming resistor RX, one end of the resistor R1 is connected with the bus voltage of the frequency converter, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, the other end of the resistor R6 is connected with one end of a resistor R7, one end of the trimming resistor RX, the main control module, and the other end of the trimming resistor RX is grounded.
3. The system for automatically adjusting the load ratio of an energy-consuming brake unit as claimed in claim 1, wherein the main control module comprises a main control chip U1, pin 1 of the main control chip U1 is connected to the voltage regulator circuit, pin 2 of the main control chip U1 is connected to one end of a resistor R15, the other end of the resistor R15 is connected to the anode of a light emitting diode LED1, the cathode of the light emitting diode LED1 is grounded, pin 5 of the main control chip U1 is connected to the monitoring voltage input module, pin 6 of the main control chip U1 is connected to the IGBT driving module, pin 8 of the main control chip U1 is grounded, and the main control chip U1 is an ADC 8-bit EPROM-Based MCU.
4. The system for automatically adjusting the load ratio of an energy-consuming brake unit as claimed in claim 3, wherein the IGBT driving module comprises a driving chip U2, pin 2 of the driving chip U2 is connected with pin 4 of the driving chip U2 and pin 6 of the main control chip U1, pin 3 of the driving chip U2 is grounded, pin 7 of the driving chip U2 is connected with the IGBT power tube through a resistor R8, and pin 8 of the driving chip U2 is connected with the low-voltage protection module.
5. The system for automatically adjusting the load ratio of an energy consumption brake unit according to claim 1 or 4, wherein the low-voltage protection module comprises a resistor R9, a resistor R10, a resistor R11, a resistor R12, a diode ZD1, a diode ZD2 and a controllable precise voltage-stabilizing source TL, one end of the resistor R9 is connected with the power supply voltage-reducing module, the other end of the resistor R9 is connected with one end of the resistor R12, the cathode of the controllable precise voltage-stabilizing source TL, the cathode of the diode ZD1 and the cathode of the diode ZD2, the other end of the resistor R12 is connected with one end of the resistor R11 and the voltage-stabilizing circuit, the other end of the resistor R11 is connected with one end of the resistor R10 and the reference electrode of the controllable precise voltage-stabilizing source TL, the other end of the resistor R10 is grounded, the anode of the controllable precise voltage-stabilizing source TL is grounded, the anode of the diode 2 is grounded, and the anode of the diode ZD1 is connected with the IGBT driving module.
CN202221601226.3U 2022-06-24 2022-06-24 Automatic load ratio adjusting system of energy-consuming brake unit Active CN217428022U (en)

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Application Number Priority Date Filing Date Title
CN202221601226.3U CN217428022U (en) 2022-06-24 2022-06-24 Automatic load ratio adjusting system of energy-consuming brake unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221601226.3U CN217428022U (en) 2022-06-24 2022-06-24 Automatic load ratio adjusting system of energy-consuming brake unit

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CN217428022U true CN217428022U (en) 2022-09-13

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