Simple control circuit for electromagnetic retarder

Abstract

The utility model provides a kind of electromagnetic retarder simple control circuit, it is related to electromagnetic retarder control field.It includes multiple groups of gear control circuit, excitation drive circuit, gear working indicator light circuit, coil overcurrent indicator light circuit, and brake light control circuit, brake light drive circuit, brake light overcurrent indicator light circuit and power indicator light, cooperate excitation coil and vehicle brake light work.This circuit dispenses with traditional CPU device, and gear switch is directly controlled excitation coil on-off regulation brake force, and drive chip is replaced relay contact;Drive chip has overcurrent detection protection function, and when overcurrent, it is automatically disconnected, and corresponding indicator light is lighted alarm;Gear working indicator light can directly show gear state.It is simple, long in life, high in reliability, can realize overcurrent protection and fault alarm, and is applicable to industrial vehicle brake control.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic retarder control, specifically to a simplified control circuit for an electromagnetic retarder. Background Technology

[0002] In industrial vehicle braking systems, electromagnetic retarders are widely used as auxiliary braking devices to reduce vehicle speed and alleviate the load on the main braking system.

[0003] Traditional electromagnetic retarder control systems often rely on CPU devices for logic control, resulting in complex circuit structures, high failure rates, and high costs. Furthermore, they frequently use relay contacts to control the excitation coil's on / off state. Traditional contact relays rely on spring tension to open and close the relay; prolonged spring tension can lead to fatigue fracture, and long-term use can cause contact wear and oxidation, resulting in poor contact, shortening controller lifespan, and reducing reliability. In addition, some traditional systems lack effective overcurrent protection mechanisms, failing to disconnect the circuit promptly when the load is overcurrent, easily damaging components. Moreover, they lack intuitive fault display devices, making it difficult for drivers to quickly grasp the operating status and fault conditions of components, hindering troubleshooting and maintenance. Utility Model Content

[0004] Purpose of the utility model: To address the above-mentioned problems, this invention provides a simplified control circuit for an industrial electromagnetic retarder with overcurrent protection and automatic alarm functions. This circuit simplifies the circuit structure, extends the service life, and improves reliability, while simultaneously providing overcurrent protection and fault alarm.

[0005] The technical solution disclosed in this utility model is as follows:

[0006] A simplified control circuit for an electromagnetic retarder includes multiple gear control circuits, an excitation drive circuit that corresponds to each gear control circuit, multiple gear working indicator circuits for displaying the gear working status, multiple coil overcurrent indicator circuits for detecting the coil overcurrent status, a brake light control circuit, a brake light drive circuit that cooperates with the brake light control circuit, a brake light overcurrent indicator circuit for detecting the brake light overcurrent status, and a power indicator.

[0007] The gear control circuit is used to receive gear switching signals and transmit them to the corresponding excitation drive circuit. The excitation drive circuit is used to drive the excitation coil to switch on and off to change the output electromagnetic force. The gear working indicator circuit is linked with the gear control circuit to display the current gear working status.

[0008] The brake light control circuit is used to receive brake control signals and transmit them to the brake light drive circuit. The brake light drive circuit is used to drive the vehicle brake lights to turn on and off to provide brake indication.

[0009] The coil overcurrent indicator circuit is linked with the corresponding excitation drive circuit, and the brake light overcurrent indicator circuit is linked with the brake light drive circuit, which are used to provide an alarm when the corresponding load is overcurrent.

[0010] The power indicator light is used to display the power supply status of the circuit and is associated with some gear position indicator lights.

[0011] In a further embodiment, the gear control circuit is provided in three groups. Each group of gear control circuits includes at least a gear switch and a current limiting resistor. Some gear control circuits also include a unidirectional conductive diode. One end of the gear switch is connected to the power supply, and the other end is connected to the corresponding excitation drive circuit and the gear working indicator circuit through the current limiting resistor. The unidirectional conductive diode is connected in series between the gear control circuit and the excitation drive circuit to prevent the current from flowing in reverse.

[0012] In a further embodiment, the excitation drive circuit is set in three groups. Each group of excitation drive circuits uses a drive chip with overcurrent detection and protection functions. The signal input terminal of the drive chip is connected to the corresponding gear control circuit, the output terminal is connected to the excitation coil, the overcurrent detection terminal is connected to the grounding current limiting resistor and the corresponding coil overcurrent indicator circuit, and the chip control terminal achieves stable control through the grounding resistor.

[0013] In a further embodiment, the gear position indicator light circuit is provided in three groups, each group of gear position indicator light circuits includes a working indicator light, one end of the working indicator light is connected to the current limiting resistor in the corresponding gear position control circuit, and the other end is grounded, so as to light up when the corresponding gear position switch is closed.

[0014] In a further embodiment, the coil overcurrent indicator circuit is provided in three groups, each group of coil overcurrent indicator circuits includes an overcurrent indicator. One end of the overcurrent indicator is connected to the overcurrent detection terminal of the drive chip in the corresponding excitation drive circuit, and the other end is grounded. All three groups of coil overcurrent indicator circuits are associated with and cooperate with the brake light overcurrent indicator circuit.

[0015] In a further embodiment, the brake light control circuit includes a brake position switch, a current-limiting resistor, and a unidirectional conductive diode. One end of the brake position switch is connected to a power supply, and the other end is connected to the brake light drive circuit and the grounding branch through the current-limiting resistor. The unidirectional conductive diode is connected in series between the brake light control circuit and the brake light drive circuit.

[0016] In a further embodiment, the brake light drive circuit uses a drive chip with overcurrent detection and protection functions. The signal input terminal of the drive chip is connected to the brake light control circuit, the output terminal is connected to the vehicle brake light, the overcurrent detection terminal is connected to the grounding current limiting resistor and the brake light overcurrent indicator circuit, the chip control terminal is connected to the power supply through a grounding resistor, and the chip also achieves stable control through a grounding resistor.

[0017] In a further embodiment, the brake light overcurrent indicator circuit includes a brake light overcurrent indicator. One end of the brake light overcurrent indicator is connected to the overcurrent detection terminal of the driver chip in the brake light driver circuit, and the other end is grounded, which is used to light up the alarm when the brake light is overcurrent.

[0018] In a further embodiment, one end of the power indicator light is connected to the power supply, the other end is grounded, and it is associated with and cooperates with the working indicator light in one of the gear working indicator light circuits to synchronously assist in displaying the power supply and the working status of the corresponding gear.

[0019] In a further embodiment, the driver chip with overcurrent detection and protection function is model BTS50085.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] (1) The CPU device in the traditional control system is eliminated, and the excitation drive circuit is directly controlled by the gear switch, which simplifies the circuit structure and reduces the number of fault points; the drive chip is used to replace the relay contact control method, which avoids contact wear and oxidation problems, extends the service life of the controller, and improves the system reliability.

[0022] (2) By utilizing the overcurrent detection and protection function of the driver chip, the circuit is automatically disconnected when the excitation coil or brake light is overcurrent, which effectively protects the load and circuit components, reduces the risk of equipment damage, and reduces maintenance costs.

[0023] (3) Set up multiple gear working indicator lights to display the gear working status in real time; set up multiple overcurrent indicator lights to promptly alarm coil and brake light faults, so that the driver can quickly grasp the circuit working status and fault location, improve the efficiency of fault diagnosis, and ensure stable vehicle operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a simplified control circuit for an electromagnetic retarder in an embodiment of this utility model.

[0025] Figure 2 This is a diagram showing the positional relationship of each indicator light in an embodiment of this utility model. Detailed Implementation

[0026] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0027] This embodiment discloses a simple control circuit for an electromagnetic retarder with overcurrent circuit breaking and automatic circuit breaking alarm functions, combined with its schematic diagram ( Figure 1 )and Figure 2 As shown. Figure 1 In this circuit, 1-1, 2-1, and 3-1 are gear position control circuits; 1-2, 2-2, and 3-2 are excitation drive circuits; 3-1, 3-2, and 3-3 are gear position indicator circuits; 1-4, 2-4, and 3-4 are coil overcurrent indicator circuits; 4-1 is a brake light control circuit; 4-2 is a brake light drive circuit; and 4-4 is a brake light overcurrent indicator circuit. R-series components are current-limiting resistors; D-series components are unidirectional diodes; U1-U4 are BTS50085 driver chips; G1-G4 are chip control terminals (G1-G4 are surface-mount optocouplers PC817); I-SEN1 to I-SEN4 are chip overcurrent detection terminals; 1-gear, 2-gear, and 3-gear are gear position switches; excitation coil 1-3 is an actuator; the vehicle brake light is a warning element; and the indicator lights are for gear position operation, coil overcurrent, brake overcurrent, and power supply display, respectively.

[0028] The simplified control circuit for the electromagnetic retarder disclosed in this embodiment mainly consists of four parts: a gear control circuit and an excitation drive circuit working together; a gear operation indicator circuit; a coil overcurrent indicator circuit; a brake light control circuit and a brake light drive circuit working together; and a brake light overcurrent indicator circuit and a power indicator circuit. The structure and connection relationship of each part of the circuit are described below.

[0029] I. Gear control circuit and excitation drive circuit cooperation structure

[0030] The gear control circuit is set up with three groups, corresponding to gears 1 through 3 respectively. Each group includes at least a gear switch and a current-limiting resistor. Some gear control circuits also include a unidirectional conductive diode. One end of the gear switch is connected to a +24V power supply, and the other end is split into two outputs through the current-limiting resistor: one output is connected to the signal input terminal of the corresponding excitation drive circuit to transmit the gear control signal; the other output is connected to the corresponding gear indicator light circuit to trigger the gear status display. The unidirectional conductive diode is connected in series between the gear control circuit and the excitation drive circuit to prevent reverse current flow from damaging the components.

[0031] The excitation drive circuit and the gear control circuit are paired one-to-one, and each group uses a drive chip (preferably BTS50085) with overcurrent detection and protection functions. The signal input terminal of the drive chip is connected to the output terminal of the corresponding gear control circuit to receive the gear control signal; the chip output terminal is connected to the excitation coil to drive the excitation coil on and off, and the output electromagnetic force is changed by controlling the operation of different excitation coils to adjust the braking force; the chip overcurrent detection terminal is connected to the grounding current-limiting resistor and the corresponding coil overcurrent indicator circuit to detect the circuit current and trigger the overcurrent alarm; the chip control terminal is connected to ground through the grounding resistor to ensure stable chip operation.

[0032] II. Gear Position Indicator Circuit Structure

[0033] The gear position indicator light circuit corresponds one-to-one with the gear position control circuit, and each group contains a working indicator light. One end of the working indicator light is connected to the output terminal of the current-limiting resistor in the corresponding gear position control circuit, and the other end is grounded. When the gear switch is closed, current flows through the current-limiting resistor and through the working indicator light, illuminating the light and visually displaying the current gear position status, making it easy for the driver to understand the gear shifting situation.

[0034] III. Circuit Structure of Coil Overcurrent Indicator Light

[0035] Each coil overcurrent indicator circuit corresponds one-to-one with the excitation drive circuit, and each group includes an overcurrent indicator. One end of the overcurrent indicator is connected to the overcurrent detection terminal of the drive chip in the corresponding excitation drive circuit, and the other end is grounded. When an overcurrent occurs in the excitation coil, the drive chip detects the overcurrent signal. On the one hand, it automatically cuts off the output circuit to achieve open-circuit protection; on the other hand, it triggers the overcurrent indicator to light up through the output signal of the overcurrent detection terminal, alerting the driver to a coil overcurrent fault. Furthermore, all three groups of coil overcurrent indicator circuits are associated with the brake light overcurrent indicator circuit, enabling multi-fault linkage alerts.

[0036] IV. Brake Light Control Circuit and Brake Light Drive Circuit Coordination Structure

[0037] The brake light control circuit includes a brake position switch, a current-limiting resistor, and a unidirectional conductive diode. One end of the brake position switch is connected to a +24V power supply, and the other end is connected to the positive terminal of the unidirectional conductive diode through the current-limiting resistor. The negative terminal of the unidirectional conductive diode is connected to the signal input terminal of the brake light drive circuit to transmit the brake control signal. At the same time, the output terminal of the brake position switch is grounded through another current-limiting resistor to ensure circuit stability.

[0038] The brake light drive circuit uses the same driver chip (BTS50085) as the excitation drive circuit, which has overcurrent detection and protection functions. The signal input terminal of the driver chip is connected to the output terminal of the brake light control circuit to receive the brake control signal; the chip output terminal is connected to the vehicle brake light to drive the brake light to illuminate and provide a braking warning; the chip overcurrent detection terminal is connected to the grounding current-limiting resistor and the brake light overcurrent indicator circuit respectively to detect the brake light branch current and trigger the overcurrent alarm; the chip control terminal is connected to a +24V power supply through a grounding resistor, and the chip is also connected to a grounding resistor, providing double protection for stable chip operation.

[0039] V. Brake light overcurrent indicator circuit and power indicator structure

[0040] The brake light overcurrent indicator circuit includes a brake light overcurrent indicator. One end of the indicator is connected to the overcurrent detection terminal of the driver chip in the brake light drive circuit, and the other end is grounded. When an overcurrent occurs in the vehicle's brake light, the driver chip automatically disconnects the circuit for protection, and simultaneously triggers the brake light overcurrent indicator to illuminate, indicating a brake light malfunction. Furthermore, the brake light overcurrent indicator is associated with the overcurrent indicator lights of each group of coils, allowing for the simultaneous display of multiple types of overcurrent faults.

[0041] One end of the power indicator light is connected to a +24V power supply, and the other end is grounded. It is used to display the power supply status of the circuit. The indicator light will light up after the circuit is powered on, indicating that the power connection is normal. At the same time, the power indicator light is associated with one of the gear working indicator lights (preferably 3 gear working indicator lights), which can help display the coordinated working status of the power supply and the corresponding gear.

[0042] Based on the above connection relationships, the working principle of this utility model circuit is as follows:

[0043] 1. Power indicator and basic power supply

[0044] After the circuit is connected to a +24V power supply, the power indicator light will illuminate, indicating that the circuit is powered normally; at the same time, the power indicator light is associated with the 3-speed operation indicator light, providing a basic power supply status reference for subsequent speed operation.

[0045] 2. Gear control and braking force adjustment

[0046] 1st gear operation: When the 1st gear switch is closed, the current is split into two paths through the current-limiting resistor in the gear control circuit: one path triggers the 1st gear operation indicator light to illuminate, indicating the 1st gear status; the other path is transmitted to the 1st gear excitation drive circuit. After receiving the signal, the drive chip outputs current to the 1st gear excitation coil, and the coil generates electromagnetic force to provide the 1st gear braking force for the vehicle.

[0047] Level 2 Operation: When the Level 2 switch is closed, the current passes through the current-limiting resistor to trigger the Level 2 operation indicator light to illuminate. At the same time, the current is transmitted to the Level 2 excitation drive circuit to drive the Level 2 excitation coil to work, generating a greater electromagnetic force and increasing the braking force to Level 2.

[0048] 3rd gear operation: When the 3rd gear switch is closed, the current passes through the current limiting resistor to trigger the 3rd gear operation indicator light to light up (which is displayed in conjunction with the power indicator light). At the same time, the current is transmitted to the 3rd gear excitation drive circuit to drive the 3rd gear excitation coil to work, generating the maximum electromagnetic force, and the braking force reaches the 3rd gear level.

[0049] By switching between different gear switches, the corresponding excitation coil can be controlled to work, thereby achieving multi-level adjustment of braking force to meet the braking needs of different working conditions.

[0050] 3. Brake warning function

[0051] When the brake shift switch is closed, current is transmitted through the current-limiting resistor and unidirectional conductive diode in the brake light control circuit to the brake light drive circuit. After receiving the signal, the drive chip outputs current to the vehicle's brake lights, illuminating the brake lights and sending a braking warning signal to vehicles or people behind, ensuring driving safety.

[0052] 4. Overcurrent protection and automatic circuit breaker alarm

[0053] Coil overcurrent protection: When the excitation coil of a certain gear has an overcurrent, the drive chip in the corresponding excitation drive circuit detects the overcurrent signal through the overcurrent detection terminal and immediately and automatically cuts off the output circuit to prevent damage to the coil and chip; at the same time, it triggers the corresponding coil overcurrent indicator light to illuminate, indicating that the coil of that gear is faulty, and it is linked with the brake light overcurrent indicator light to facilitate the driver to quickly locate the fault.

[0054] Brake light overcurrent protection: When the vehicle brake light experiences overcurrent, the driver chip in the brake light drive circuit detects the overcurrent signal and automatically disconnects the circuit to protect the brake light and the chip; at the same time, it triggers the brake light overcurrent indicator light to illuminate, indicating a brake light fault, and it is linked with the overcurrent indicator lights of each group of coils to comprehensively display the fault status.

[0055] In this embodiment, the simplified control circuit for an industrial electromagnetic retarder with overcurrent circuit breaking and automatic circuit breaking alarm functions uses a +24V power supply. The driver chip is uniformly selected as BTS50085, the indicator lights are LED (power indicator is green, gear position indicator is yellow, and overcurrent indicator is red), the resistor is a metal film current limiting resistor (resistance range 1kΩ-10kΩ), the diode is a 1N4007 silicon diode, and the gear position switch and brake gear position switch are industrial-grade toggle switches.

[0056] 5. Circuit power-on initialization

[0057] When the circuit is connected to a +24V power supply, the power indicator light (green) will illuminate, indicating that the circuit is powered normally. The power indicator light is associated with the 3-speed working indicator light (yellow). If the 3-speed working indicator light is not illuminated at this time, it indicates that there is no working speed.

[0058] A workflow

[0059] When the 1st gear switch is closed, the +24V current is output through the switch and split into two paths: one path is transmitted through the current-limiting resistor R1-2 to the signal input terminal of the U1 chip in the excitation drive circuit 1-2. The U1 chip starts working and its output terminal supplies power to the excitation coil 1. The coil 1 generates electromagnetic force, and the vehicle obtains the 1st gear braking force; the other path is transmitted through the resistor R1-2 to the 1st gear working indicator circuit. The 1st gear working indicator (yellow) lights up, indicating the 1st gear working status.

[0060] If an overcurrent occurs in excitation coil 1, the U1 chip detects the overcurrent signal through the I-SEN1 pin and immediately disconnects the output terminal from coil 1 to achieve circuit breaker protection. At the same time, the output signal of the I-SEN1 pin triggers the overcurrent indicator light (red) of the gear 1 coil to light up, indicating a fault in the gear 1 coil. This indicator light is also associated with the overcurrent indicator light of the brake light to assist in fault indication.

[0061] Second-stage workflow

[0062] When the 2-gear switch is closed, the +24V current is output through the switch and split into two paths: one path is transmitted through the current-limiting resistor R2-1 and the diode D2 to the signal input terminal of the U2 chip in the excitation drive circuit 2-2. The U2 chip starts working and its output terminal supplies power to the excitation coil 2. The coil 2 generates electromagnetic force, and the vehicle's braking force is increased to the 2-gear level; the other path is transmitted through the resistor R2-2 to the 2-gear working indicator circuit. The 2-gear working indicator (yellow) lights up, indicating the 2-gear working status.

[0063] If the excitation coil 2 experiences overcurrent, the U2 chip detects the overcurrent signal through the I-SEN2 pin and automatically disconnects the circuit. At the same time, it triggers the overcurrent indicator light (red) of the second-gear coil to light up, and it also triggers an alarm in conjunction with the overcurrent indicator light of the brake light.

[0064] Three-level work process

[0065] When the 3-gear switch is closed, the +24V current is output through the switch and split into two paths: one path is transmitted through the current-limiting resistor R3-1 and diode D3 to the signal input terminal of the U3 chip in the excitation drive circuit 3-2. The U3 chip starts working and its output terminal supplies power to the excitation coil 3. The coil 3 generates electromagnetic force, and the vehicle's braking force is increased to the 3-gear level; the other path is transmitted through resistor R3-2 to the 3-gear working indicator circuit. The 3-gear working indicator (yellow) lights up and is associated with the power indicator (green), synchronously displaying the 3-gear working and normal power status.

[0066] If the excitation coil 3 experiences overcurrent, the U3 chip detects the overcurrent signal through the I-SEN3 pin and automatically disconnects the circuit, triggering the 3rd gear coil overcurrent indicator light (red) to illuminate, and triggering an alarm in conjunction with the brake light overcurrent indicator light and the 2nd gear coil overcurrent indicator light.

[0067] 6. Brake warning and overcurrent protection procedures

[0068] When the brake gear switch is closed, the +24V current is output through the switch and then transmitted to the signal input terminal of the U4 chip in the brake light driver circuit 4-2 through the current limiting resistor R4-1 and diode D4. The U4 chip starts working and outputs power to the vehicle's brake lights, illuminating the brake lights and sending a braking warning to the rear.

[0069] If the brake light experiences overcurrent, the U4 chip detects the overcurrent signal through the I-SEN4 pin and automatically disconnects the circuit, triggering the brake light overcurrent indicator (red) to light up. This indicator is also linked to the overcurrent indicator of the 1st to 3rd gear coils, providing comprehensive fault indication.

[0070] In this embodiment, the circuit simplifies the structure and optimizes the selection of components, thereby achieving coordinated operation of braking force regulation, overcurrent protection and fault alarm, solving the defects of traditional control systems and making it suitable for efficient control of electromagnetic retarders in industrial vehicles.

[0071] It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Without departing from the core features of this utility model, the same function can be achieved by adjusting component models, parameters, etc., and such adjustments all fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims, and all variations falling within the meaning and scope of equivalent elements of the claims are included within this utility model.

Claims

1. A simple control circuit for an electromagnetic retarder, characterized in that, include: The system includes multiple gear control circuits, an excitation drive circuit that corresponds to each gear control circuit, multiple gear working indicator circuits for displaying the gear working status, multiple coil overcurrent indicator circuits for detecting the coil overcurrent status, a brake light control circuit, a brake light drive circuit that cooperates with the brake light control circuit, a brake light overcurrent indicator circuit for detecting the brake light overcurrent status, and a power indicator. The gear control circuit is used to receive gear switching signals and transmit them to the corresponding excitation drive circuit. The excitation drive circuit is used to drive the excitation coil to switch on and off to change the output electromagnetic force. The gear working indicator circuit is linked with the gear control circuit to display the current gear working status. The brake light control circuit is used to receive brake control signals and transmit them to the brake light drive circuit. The brake light drive circuit is used to drive the vehicle brake lights to turn on and off to provide brake indication. The coil overcurrent indicator circuit is linked with the corresponding excitation drive circuit, and the brake light overcurrent indicator circuit is linked with the brake light drive circuit, which are used to provide an alarm when the corresponding load is overcurrent. The power indicator light is used to display the power supply status of the circuit and is associated with some gear position indicator lights.

2. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The gear control circuit is set in three groups. Each gear control circuit includes at least a gear switch and a current limiting resistor. Some gear control circuits also include a unidirectional conductive diode. One end of the gear switch is connected to the power supply, and the other end is connected to the corresponding excitation drive circuit and the gear working indicator circuit through the current limiting resistor. The unidirectional conductive diode is connected in series between the gear control circuit and the excitation drive circuit to prevent the current from flowing in reverse.

3. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The excitation drive circuit is set in three groups. Each group of excitation drive circuits uses a drive chip with overcurrent detection and protection functions. The signal input terminal of the drive chip is connected to the corresponding gear control circuit, the output terminal is connected to the excitation coil, the overcurrent detection terminal is connected to the grounding current limiting resistor and the corresponding coil overcurrent indicator circuit, and the chip control terminal achieves stable control through the grounding resistor.

4. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The gear position indicator light circuit is set in three groups. Each group of gear position indicator light circuits includes a working indicator light. One end of the working indicator light is connected to the current limiting resistor in the corresponding gear position control circuit, and the other end is grounded so that it lights up when the corresponding gear position switch is closed.

5. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The coil overcurrent indicator circuit is set in three groups, and each group of coil overcurrent indicator circuits includes an overcurrent indicator. One end of the overcurrent indicator is connected to the overcurrent detection terminal of the drive chip in the corresponding excitation drive circuit, and the other end is grounded. All three groups of coil overcurrent indicator circuits are associated with and cooperate with the brake light overcurrent indicator circuit.

6. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The brake light control circuit includes a brake position switch, a current-limiting resistor, and a unidirectional conductive diode. One end of the brake position switch is connected to the power supply, and the other end is connected to the brake light drive circuit and the grounding branch through the current-limiting resistor. The unidirectional conductive diode is connected in series between the brake light control circuit and the brake light drive circuit.

7. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The brake light drive circuit uses a drive chip with overcurrent detection and protection functions. The signal input terminal of the drive chip is connected to the brake light control circuit, the output terminal is connected to the vehicle brake light, the overcurrent detection terminal is connected to the grounding current limiting resistor and the brake light overcurrent indicator circuit, and the chip control terminal is connected to the power supply through the grounding resistor. The chip also achieves stable control through the grounding resistor.

8. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, The brake light overcurrent indicator circuit includes a brake light overcurrent indicator. One end of the brake light overcurrent indicator is connected to the overcurrent detection terminal of the driver chip in the brake light driver circuit, and the other end is grounded. It is used to light up as an alarm when the brake light is overcurrent.

9. The simplified control circuit for the electromagnetic retarder according to claim 1, characterized in that, One end of the power indicator light is connected to the power supply, and the other end is grounded. It is also associated with the working indicator light in one of the gear working indicator light circuits to synchronously assist in displaying the power supply and the working status of the corresponding gear.

10. The simplified control circuit for the electromagnetic retarder according to claim 3 or 7, characterized in that, The driver chip with overcurrent detection and protection function is model BTS50085.

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