Heating feedback circuit

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a heating feedback circuit which comprises a heating element, a current sensor, a diode and a filtering unit. The heating element R1 is connected in series between the 270V heating power supply and the current input end of the current sensor u1, and the output end of the current sensor is connected in parallel with the transient suppression diode to be grounded; the power input positive end of the current sensor is connected with a 28V power supply through the filtering unit.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, and specifically relates to a heating feedback circuit. Background Technology

[0002] Existing sensor heating feedback circuits are all based on AC power supply, providing feedback on the heating status of the heating element. However, for the new model which uses 270VDC DC for heating elements, traditional heating feedback circuits cannot monitor the heating current.

[0003] In order to meet the requirements of the new model's DC power supply, it is urgent to design and develop a heating feedback circuit that can be compatible with both DC and AC power supplies while having the same function. Utility Model Content

[0004] Purpose of this utility model: To address the problems mentioned in the background art, this utility model proposes a heating feedback circuit that can satisfy the heating signal feedback of DC or AC heating power supplies. It simplifies the circuit structure and has a wide range of applications.

[0005] The technical solution of this utility model:

[0006] A heating feedback circuit includes a heating element, a current sensor, a diode, and a filter unit;

[0007] The heating element R1 is connected in series between the 270V heating power supply and the current input terminal of the current sensor u1.

[0008] A transient suppression diode is connected in parallel to ground at the output terminal of the current sensor;

[0009] The filter unit is connected to the positive power input terminal of the current sensor and the 28V power supply at its two ends, respectively.

[0010] Furthermore, the input terminal of the heating element R1 is connected to 28V-540V DC or AC.

[0011] Furthermore, the filtering unit includes: a three-terminal filter L1, an inductor L2, and a capacitor;

[0012] A capacitor is connected in parallel between pins 2 and 3 of the three-terminal filter. Pin 3 of the three-terminal filter is connected to the positive power input terminal of the current sensor. Pin 1 of the three-terminal filter is connected to one end of inductor L2, and the other end of inductor L2 is connected to a 28V power supply.

[0013] Furthermore, a diode D1 is also provided between the inductor L2 and the 28V power supply.

[0014] Furthermore, the negative terminal of the current sensor's power input is grounded.

[0015] Furthermore, the current output terminal of the current sensor is grounded.

[0016] Beneficial effects

[0017] The heating feedback circuit proposed in this utility model can simultaneously meet the needs of both DC and AC heating feedback power supplies, and it has the characteristics of wide application range and high precision. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a heating feedback circuit. Detailed Implementation

[0019] The heating feedback circuit of this utility model mainly consists of a heating element R1, a current sensor U1, a filter L1, a diode D1, an inductor L2, and a transient suppression diode D2.

[0020] The heating element R1 is connected in series between the heating power supply and the current sensor U1, and the current output terminal of the current sensor is grounded, forming the heating circuit of the heating element R1. A filter L2, a diode D1, and an inductor L2 are connected in series between the feedback power supply and the current sensor U1 for circuit protection. A transient suppression diode D2 is connected between the output terminal and the ground of the current sensor U1 to protect the heating self-test output signal.

[0021] A DC heating feedback circuit is used to monitor whether the heating of the angle-of-attack sensor is normal. The heating element R1 is connected in series between the 270V heating power supply and the current sensor U1. The filter L2, diode D1, and inductor L2 are connected between the current sensor U1 and the 28V power supply. A transient suppression diode is connected in parallel at the output of the current sensor U1.

Claims

1. A heating feedback circuit, characterized in that, The circuit includes a heating element, a current sensor, a diode, and a filter unit; The heating element R1 is connected in series between the 270V heating power supply and the current input terminal of the current sensor u1. A transient suppression diode is connected in parallel to ground at the output terminal of the current sensor; The two ends of the filter unit are connected to the positive power input terminal of the current sensor and the 28V power supply, respectively.

2. The heating feedback circuit according to claim 1, characterized in that: The input terminal of the heating element R1 is connected to 28V~540V DC or AC.

3. A heating feedback circuit according to claim 1, characterized in that, The filtering unit includes: a three-terminal filter L1, an inductor L2, and a capacitor; A capacitor is connected in parallel between pins 2 and 3 of the three-terminal filter. Pin 3 of the three-terminal filter is connected to the positive power input terminal of the current sensor. Pin 1 of the three-terminal filter is connected to one end of inductor L2, and the other end of inductor L2 is connected to a 28V power supply.

4. A heating feedback circuit according to claim 1, characterized in that, A diode D1 is also provided between inductor L2 and the 28V power supply.

5. A heating feedback circuit according to claim 1, characterized in that, The negative terminal of the power input of the current sensor is grounded.

6. A heating feedback circuit according to claim 1, characterized in that, The current output terminal of the current sensor is grounded.

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