Heater control circuit for driving IGBT based on PWM wave duty ratio

By using an IGBT control circuit driven by PWM wave duty cycle, the problem of unstable heater temperature control was solved, and stable heating and fast response of the heater were achieved.

CN223625848UActive Publication Date: 2025-12-02WUHAN AVIATION INSTR
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Patent Information

Application Number
CN202423008933.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-12-02
Estimated Expiration
2034-12-05

AI Technical Summary

Technical Problem

In existing technologies, the temperature control of heaters is unstable, and stable heating cannot be achieved through AC power.

Method used

An IGBT control circuit based on PWM duty cycle drive is adopted. Through high-speed optocoupler and high and low side gate drive circuit chips, combined with IGBT transistors, stable control of the heater is achieved.

Benefits of technology

Stable temperature control of the heater is achieved by adjusting the duty cycle of the PWM waveform to regulate the heating capacity and time, ensuring that the heater responds quickly to different needs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the field of icing detection systems, and relates to a heater control circuit for driving an IGBT (Insulated Gate Bipolar Translator) based on PWM (Pulse Width Modulation) wave duty ratio. The circuit comprises a high-speed optocoupler N101, a high-low side gate drive circuit chip N102 and an IGBT (Insulated Gate Bipolar Translator), a pin 2 of the high-speed optocoupler N101 is connected with a low-voltage power supply V1 through a first resistor R101, and is connected with an input control signal; a pin 8 of the high-speed optocoupler N101 is connected with a high-voltage power supply V2, a pin 7 of the high-speed optocoupler N101 is connected with a pin 13 of the high-low side gate drive circuit chip N102, and a pin 5 of the high-speed optocoupler N101 is grounded; a pin 4 and a pin 11 of the high-low side gate drive circuit chip N102 are connected with a high-voltage power supply V2, and a pin 2 and a pin 17 are grounded; a pin 9 is connected with one end of a second resistor R102, the other end of the second resistor R102 is connected with a grid electrode of an IGBT, a source electrode of the IGBT is connected with the alternating current ground, and a drain electrode of the IGBT is connected with a heater.
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Description

Technical Field

[0001] This utility model belongs to the field of icing detection systems and relates to a heater control circuit based on PWM wave duty cycle driving IGBT. Background Technology

[0002] Icing detection systems are essential equipment on medium and large civil aircraft, and the rapid development of civil aircraft has created a huge demand for them. Currently, China is in the initial stage of developing icing detection systems. As an indispensable component of the system, the heater's operating status has a significant impact on the icing detection system. Therefore, controlling the heater's duty cycle through PWM waves is of great importance in the field of icing detection systems.

[0003] Currently, the use of AC power for heating and de-icing in aircraft has the following disadvantages:

[0004] The temperature of the heater cannot be controlled stably; the heating function can only be achieved by constantly switching the heater on and off. Utility Model Content

[0005] Purpose of the utility model: To solve the problems mentioned in the background art, this utility model provides a heater control circuit based on PWM wave duty cycle driving IGBT to ensure the normal operation of the icing detection system.

[0006] The technical solution of this utility model:

[0007] A heater control circuit based on PWM wave duty cycle driven IGBT includes: high-speed optocoupler N101, high and low side gate drive circuit chip N102, and IGBT;

[0008] Pin 2 of the high-speed optocoupler N101 is connected to the low-voltage power supply V1 through the first resistor R101, and pin 2 of the high-speed optocoupler N101 is connected to the input control signal; pin 8 of the high-speed optocoupler N101 is connected to the high-voltage power supply V2; pin 7 of the high-speed optocoupler N101 is connected to pin 13 of the high- and low-side gate drive circuit chip N102; and pin 5 of the high-speed optocoupler N101 is grounded.

[0009] Pins 4 and 11 of the high-side and low-side gate drive circuit chip N102 are connected to the high-voltage power supply V2, and pins 2 and 17 are grounded; pin 9 is connected to one end of the second resistor R102, the other end of the second resistor R102 is connected to the gate of the IGBT, the source of the IGBT is connected to AC ground, and the drain of the IGBT is connected to the heater.

[0010] Furthermore, the input control signal is a PWM wave signal.

[0011] Furthermore, pins 4 and 11 of the high-side and low-side gate drive circuit chip N102 are also grounded through the first capacitor C101. C101 is used to filter out noise from the high-voltage power supply.

[0012] Furthermore, pin 6 of the high-side and low-side gate drive circuit chip N102 is connected to the cathode of the first diode V101, and the anode of the first diode V101 is grounded. The diode serves as a voltage reverse protection mechanism.

[0013] Furthermore, pin 8 of the high-side and low-side gate drive circuit chip N102 is connected to the cathode of the second diode V102, and the anode of the second diode V102 is connected to the high-voltage power supply V2. The diode serves as a voltage reverse protection mechanism.

[0014] Furthermore, the AC power supply voltage is 115V / 400Hz.

[0015] Furthermore, a second capacitor C102 is connected between pins 8 and 6 of the high-side and low-side gate drive circuit chip N102. The capacitor serves as a filter and isolation element.

[0016] Beneficial effects

[0017] This invention supplies power to the heater via a 115V AC power supply, where the circuit's on / off state is controlled by the on / off state of an IGBT transistor. The IGBT transistor's drive is adjusted and controlled by the duty cycle of a PWM waveform. This allows the heater to maintain a stable control state. When the PWM waveform duty cycle increases, the heater's heating capacity strengthens, the heating time lengthens, and the temperature rises rapidly. When the PWM waveform duty cycle decreases, the heater's heating capacity weakens, the heating time shortens, and the temperature rise rate slows down. When the duty cycle reaches 0, the heating state is cut off. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a heater control circuit based on PWM wave duty cycle driving IGBT. Detailed Implementation

[0019] A heater control circuit for an icing detection system is disclosed. The heater is connected in series with an IGBT and then connected to both ends of an AC power supply. The IGBT drive circuit includes a high-speed optocoupler N101, a current-limiting resistor R101, and a high- and low-side gate drive circuit module connected in series. The PWM wave is input to the high-speed optocoupler through pin 3 and then output to the high- and low-side gate drive circuit. It is then input to the gate (G) of the IGBT through resistor R102, thereby achieving the purpose of driving the IGBT to turn on and off.

[0020] The circuit drive signal is a PWM wave signal.

[0021] Input isolation uses high-speed optocouplers to ensure that the signal is not distorted.

[0022] The high-speed optocoupler is then connected to the high and low side gate drive circuits.

[0023] IGBTs are driven using high-side and low-side gate drive circuits.

[0024] The AC power supply voltage is 115V / 400Hz.

[0025] The heater is controlled via IGBTs.

[0026] After the PWM wave is sent out, it passes through the isolation circuit and the drive circuit, and is input into the IGBT. By controlling the duty cycle of the PWM wave driving the IGBT, the IGBT is turned on and off, thereby realizing the control of the heater by the PWM wave.

Claims

1. A heater control circuit based on PWM wave duty cycle driving IGBT, characterized in that: The circuit includes: High-speed optocoupler N101, high and low side gate drive circuit chip N102, IGBT; Pin 2 of the high-speed optocoupler N101 is connected to the low-voltage power supply V1 through the first resistor R101, and pin 2 of the high-speed optocoupler N101 is connected to the input control signal; pin 8 of the high-speed optocoupler N101 is connected to the high-voltage power supply V2; pin 7 of the high-speed optocoupler N101 is connected to pin 13 of the high- and low-side gate drive circuit chip N102; and pin 5 of the high-speed optocoupler N101 is grounded. Pins 4 and 11 of the high-side and low-side gate drive circuit chip N102 are connected to the high-voltage power supply V2, and pins 2 and 17 are grounded; pin 9 is connected to one end of the second resistor R102, the other end of the second resistor R102 is connected to the gate of the IGBT, the source of the IGBT is connected to AC ground, and the drain of the IGBT is connected to the heater.

2. The circuit according to claim 1, characterized in that: The input control signal is a PWM wave signal.

3. The circuit according to claim 1, characterized in that: Pins 4 and 11 of the high-side and low-side gate drive circuit chip N102 are also grounded through the first capacitor C101.

4. The heater control circuit according to claim 1, characterized in that: Pin 6 of the high-side and low-side gate drive circuit chip N102 is connected to the cathode of the first diode V101, and the anode of the first diode V101 is grounded.

5. The circuit according to claim 1, characterized in that: Pin 8 of the high-side and low-side gate drive circuit chip N102 is connected to the cathode of the second diode V102, and the anode of the second diode V102 is connected to the high-voltage power supply V2.

6. The circuit according to claim 1, characterized in that: The AC power supply voltage is 115V / 400Hz.

7. The heater control circuit as described in claim 1, characterized in that: A second capacitor C102 is connected between pins 8 and 6 of the high-side and low-side gate drive circuit chip N102.