CN211792066U - An electric heating glass temperature sensing control circuit - Google Patents

Abstract

The utility model relates to the field of electric heating glass, in particular to an electric heating glass temperature sensing control circuit; an electric heating glass temperature sensing control circuit comprises: a circuit protection module, a detection module and an amplification module; wherein the circuit protection module comprises: a protection module And excitation module, mainly used for circuit overload protection and auxiliary circuit to add specific working power; detection module includes: overvoltage detection and overcurrent detection, mainly used to detect the magnitude of voltage and current in the circuit; amplification module It is mainly used for the control of the strength of the temperature signal; the utility model adds a protection module to the electric heating glass temperature sensing control circuit, protects the output from the overvoltage problem of the circuit, and at the same time detects the magnitude of the voltage and current to reduce the When the overvoltage problem occurs, the amplifying module is used to reduce the interference of the external environment and equipment on the output signal. At the same time, the amplifying module can amplify the output signal to ensure that the temperature signal can be output stably.

Description

An electric heating glass temperature sensing control circuit

technical field

The utility model relates to the field of electric heating glass, in particular to a temperature sensing control circuit for electric heating glass.

Background technique

Electric heating glass makes the surface temperature of the glass begin to rise by heating the glass with electricity. When the temperature is controlled between 35°C-40°C, the temperature of the glass heating surface is kept at the same level or slightly higher than the surface temperature of the glass, so as to achieve no production. The effect of fog and frost; electrically heated glass is now widely used.

Electric heating glass uses low voltage, low power consumption, and when the glass is heated, the temperature of the glass surface can be rotated to adjust the temperature, which greatly improves the safety; but the existing electric heating glass temperature sensing control circuit technology also has the following question:

1. When multiple glasses are heated at the same time, the safety of the glass and the working personnel cannot be guaranteed, and the voltage and current cannot be detected;

2. When the temperature signal is transmitted, the signal will become weak, thus affecting the accuracy of the temperature.

Utility model content

The purpose of the utility model is to provide an electric heating glass temperature sensing control circuit to solve the above-mentioned problems.

Technical scheme: electric heating glass temperature sensing control circuit, including: circuit protection module, detection module and amplification module; wherein the circuit protection module includes: protection module and excitation module; detection module includes: overvoltage detection and overcurrent detection.

In a further embodiment, the protection module includes: a current controller U1, a diode D1, a capacitor C1, a capacitor C2, a thermistor RT1, a capacitor C3, a transistor Q1, a resistor R1, a capacitor C4, a transformer T1, a diode D2, Electrolytic capacitor C5, resistor R2, diode D3, diode D4, capacitor C6, resistor R3, and adjustable resistor Z1; the No. 6 pin of the current controller U1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 One end is connected to the cathode of the diode D1, the No. 5 pin of the current controller U1 is connected to one end of the capacitor C2, and the No. 7 pin of the current controller U1 is connected to one end of the thermistor RT1. connected, the No. 2 pin of the current controller U1 is connected to the anode of the diode D1, one end of the capacitor C3, one end of the resistor R1 and the input end of the transformer T at the same time, the current controller Pin No. 1 of U1 is connected to the base of the transistor Q1, pin No. 3 of the current controller U1 is connected to the emitter of the transistor Q1 and one end of the capacitor C4 at the same time, and the collector of the transistor Q1 At the same time, it is connected to the anode of the diode D2 and the input end of the transformer T1, the cathode of the diode D2 is connected to the other end of the capacitor C3 and the other end of the resistor R1 at the same time, and the output end of the transformer T1 It is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the anode of the electrolytic capacitor C5, one end of the resistor R2 and one end of the resistor R3, and the cathode of the electrolytic capacitor C5 is connected to the electrolytic capacitor C5. The output end of the transformer T1 is connected and grounded, the other end of the resistor R2 is connected to the anode of the diode D3, and the cathode of the diode D3 is connected to one end of the capacitor C6 and the cathode of the diode D4 at the same time. The other end of the resistor R3 is connected to the other end of the capacitor C6 and one end of the adjustable resistor Z1 at the same time, the adjustable end of the adjustable resistor Z1 is connected to the anode of the diode D4, and the adjustable resistor Z1 The other end of the capacitor C4 is connected to the other end of the capacitor C4, the other end of the thermistor RT1 and the other end of the capacitor C2 at the same time and is grounded; the function of the protection module is to protect the circuit when the circuit fails. components and glass.

In a further embodiment, the excitation module includes: a crystal oscillator capacitor C7, a resistor R4, a bidirectional diode D5, a resistor R5, a transistor Q2, a capacitor C8, a diode D6, and a resistor R6; wherein one end of the crystal oscillator capacitor C7 is simultaneously connected to all One end of the resistor R5 is connected to the anode of the diode D6, the other end of the crystal capacitor C7 is connected to one end of the bidirectional diode D5 and one end of the resistor R4 at the same time, and the other end of the resistor R5 is simultaneously connected to the The other end of the bidirectional diode D5 is connected to the base of the triode Q2, the collector of the triode Q2 is simultaneously connected to one end of the capacitor C8, and the other end of the capacitor C8 is simultaneously connected to the cathode of the diode D6 and One end of the resistor R6 is connected, and the emitter of the transistor Q2 is connected to the other end of the resistor R6 and the other end of the resistor R4 at the same time; the excitation module is to convert the power supply voltage into the voltage required for heating size.

In a further embodiment, the overvoltage detection includes: a diode D6, an adjustable resistor Z2, a capacitor C9, and a bidirectional diode D7; the anode of the diode D6 is simultaneously connected to one end of the adjustable resistor Z2 and the capacitor C9 One end of the adjustable resistor Z2 is connected to the other end of the capacitor C9 and one end of the bidirectional diode D7 at the same time, and the other end of the adjustable resistor Z2 is connected to the other end of the bidirectional diode D7. One end is connected; the overvoltage detection is to detect the circuit voltage.

In a further embodiment, the overcurrent detection includes: a capacitor C10, an adjustable resistor Z3, a diode D8, a resistor R7, a transistor Q3, a transistor Q4, a diode D11, a diode D10, and a diode D9; wherein the adjustable resistor Z3 The adjustable end of the diode D9 is connected to the cathode of the diode D9 and the cathode of the diode D10 at the same time, and one end of the adjustable resistor Z3 is connected to the anode of the diode D9 and one end of the capacitor C10 at the same time. The other end of the resistor Z3 is connected to the other end of the capacitor C10 and the cathode of the diode D8 at the same time, and the emitter of the transistor Q3 is connected to the anode of the diode D8 and one end of the resistor R7 at the same time. The base of Q3 is connected to the other end of the resistor R7 and the emitter of the transistor Q4 at the same time, the collector of the transistor Q4 is connected to the collector of the transistor Q3, and the base of the transistor Q4 is connected to the The anode of the diode D11 is connected to the anode of the diode D11, and the cathode of the diode D11 is connected to the anode of the diode D10; the overcurrent detection is to detect the circuit current.

In a further embodiment, the amplifying module includes: a crystal oscillator X1, a capacitor C11, a resistor R8, a transistor Q5, a resistor R9, an amplifier U2, an amplifier U3, a diode D12, a capacitor C12, a capacitor C13, a resistor R10, a resistor R11, Capacitor C14; wherein, the No. 3 pin of the amplifier U2 is connected to the collector of the transistor Q5 and one end of the capacitor C11 at the same time, and the base of the transistor Q5 is simultaneously connected to the other end of the capacitor C11 and all One end of the resistor R8 is connected, the No. 2 pin of the amplifier U2 is connected to one end of the resistor R8 and the anode of the diode D12 at the same time, and the No. 1 pin of the amplifier U2 is connected to one end of the capacitor C12 at the same time. , the cathode of the diode D12, one end of the capacitor C13 is connected to the No. 5 pin of the amplifier U3, the other end of the capacitor C12 is connected to the No. 1 pin of the crystal oscillator X1, and the amplifier U3 The No. 6 pin is connected to one end of the resistor R11 and one end of the resistor R10 at the same time, the No. 7 pin of the amplifier U3 is connected to the other end of the resistor R11, and the other end of the resistor R10 is connected to the One end of the capacitor C14 is connected, and the other end of the capacitor C14 is simultaneously connected to the other end of the capacitor C13, the other end of the resistor R9, the emitter of the transistor Q5, the other end of the resistor R8 and the The No. 2 pin of the crystal oscillator X1 is connected and grounded; the amplifying module amplifies and controls the temperature signal.

Beneficial effects: The utility model can perform real-time voltage detection and current real-time detection on multiple heating glass circuits by adding overvoltage detection and overcurrent detection to the electric heating glass temperature sensing control circuit, thereby reducing circuit accidents. At the same time, when the temperature signal is transmitted, the circuit will amplify and control the signal according to the attenuation of external equipment and circuits to ensure the accuracy of the temperature.

Description of drawings

Figure 1 is a circuit diagram of the present utility model.

FIG. 2 is a circuit diagram of the circuit protection module of the present invention.

3 is a circuit diagram of a detection module of the present invention.

FIG. 4 is a circuit diagram of the amplifying module of the present invention.

Detailed ways

An electric heating glass temperature sensing control circuit, comprising: an electric heating glass temperature sensing control circuit, comprising: a circuit protection module, a detection module and an amplification module; wherein the circuit protection module comprises: a protection module and an excitation module; the detection module comprises: an overvoltage detection and overcurrent detection.

The protection module includes: current controller U1, diode D1, capacitor C1, capacitor C2, thermistor RT1, capacitor C3, transistor Q1, resistor R1, capacitor C4, transformer T1, diode D2, electrolytic capacitor C5, resistor R2, Diode D3, diode D4, capacitor C6, resistor R3, adjustable resistor Z1; excitation module includes: crystal capacitor C7, resistor R4, bidirectional diode D5, resistor R5, transistor Q2, capacitor C8, diode D6, resistor R6; overvoltage detection Including: diode D6, adjustable resistor Z2, capacitor C9, bidirectional diode D7; overcurrent detection includes: capacitor C10, adjustable resistor Z3, diode D8, resistor R7, transistor Q3, transistor Q4, diode D11, diode D10, diode D9 The amplifier module includes: crystal oscillator X1, capacitor C11, resistor R8, transistor Q5, resistor R9, amplifier U2, amplifier U3, diode D12, capacitor C12, capacitor C13, resistor R10, resistor R11, capacitor C14.

As shown in FIG. 2, pin 6 of the current controller U1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the cathode of the diode D1, and pin 5 of the current controller U1 The No. 1 pin is connected with one end of the capacitor C2, the No. 7 pin of the current controller U1 is connected with one end of the thermistor RT1, and the No. 2 pin of the current controller U1 is connected with the diode at the same time. The positive electrode of D1, one end of the capacitor C3, and one end of the resistor R1 are connected to the input end of the transformer T, the No. 1 pin of the current controller U1 is connected to the base of the transistor Q1, and the The No. 3 pin of the current controller U1 is connected with the emitter of the transistor Q1 and one end of the capacitor C4 at the same time, and the collector of the transistor Q1 is connected with the anode of the diode D2 and the input of the transformer T1 at the same time, The cathode of the diode D2 is connected to the other end of the capacitor C3 and the other end of the resistor R1 at the same time, the output end of the transformer T1 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the other end of the diode D2 at the same time. The positive electrode of the electrolytic capacitor C5 and one end of the resistor R2 are connected to one end of the resistor R3, the negative electrode of the electrolytic capacitor C5 is connected to the output end of the transformer T1 and grounded, and the other end of the resistor R2 is connected to the output end of the transformer T1. The anode of the diode D3 is connected to the anode, the cathode of the diode D3 is connected to one end of the capacitor C6 and the cathode of the diode D4 at the same time, and the other end of the resistor R3 is connected to the other end of the capacitor C6 and the capacitor C6 at the same time. One end of the adjustable resistor Z1 is connected, the adjustable end of the adjustable resistor Z1 is connected to the anode of the diode D4, and the other end of the adjustable resistor Z1 is connected to the other end of the capacitor C4 and the thermistor at the same time. The other end of RT1 is connected to the other end of the capacitor C2 and is grounded; one end of the crystal oscillator capacitor C7 is connected to one end of the resistor R5 and the anode of the diode D6 at the same time, and the other end of the crystal oscillator capacitor C7 is simultaneously connected to the One end of the bidirectional diode D5 is connected to one end of the resistor R4, and the other end of the resistor R5 is simultaneously connected to the other end of the bidirectional diode D5 and the base of the triode Q2, and the collector of the triode Q2 At the same time, it is connected to one end of the capacitor C8, the other end of the capacitor C8 is connected to the cathode of the diode D6 and one end of the resistor R6 at the same time, and the emitter of the transistor Q2 is connected to the other end of the resistor R6 at the same time. Connect to the other end of the resistor R4.

As shown in FIG. 3 , the anode of the diode D6 is connected to one end of the adjustable resistor Z2 and one end of the capacitor C9 at the same time, and the adjustable end of the adjustable resistor Z2 is simultaneously connected to the other end of the capacitor C9 It is connected to one end of the bidirectional diode D7, and the other end of the adjustable resistor Z2 is connected to the other end of the bidirectional diode D7; the adjustable end of the adjustable resistor Z3 is simultaneously connected to the negative electrode of the diode D9 and all The cathode of the diode D10 is connected to the cathode of the diode D10, one end of the adjustable resistor Z3 is connected to the anode of the diode D9 and one end of the capacitor C10 at the same time, and the other end of the adjustable resistor Z3 is connected to the other end of the capacitor C10 at the same time. It is connected with the cathode of the diode D8, the emitter of the transistor Q3 is connected with the anode of the diode D8 and one end of the resistor R7 at the same time, and the base of the transistor Q3 is connected with the other end of the resistor R7 and the resistor R7 at the same time. The emitter of the transistor Q4 is connected, the collector of the transistor Q4 is connected to the collector of the transistor Q3, the base of the transistor Q4 is connected to the anode of the diode D11, and the cathode of the diode D11 is connected to the diode D11. The anode of the diode D10 is connected.

As shown in FIG. 4 , the No. 3 pin of the amplifier U2 is connected to the collector of the transistor Q5 and one end of the capacitor C11 at the same time, and the base of the transistor Q5 is connected to the other end of the capacitor C11 and the capacitor C11 at the same time. One end of the resistor R8 is connected, the No. 2 pin of the amplifier U2 is connected to one end of the resistor R8 and the anode of the diode D12 at the same time, and the No. 1 pin of the amplifier U2 is connected to the capacitor C12 at the same time. One end, the negative electrode of the diode D12, one end of the capacitor C13 is connected to the No. 5 pin of the amplifier U3, the other end of the capacitor C12 is connected to the No. 1 pin of the crystal oscillator X1, and the amplifier Pin No. 6 of U3 is connected to one end of the resistor R11 and one end of the resistor R10 at the same time, pin No. 7 of the amplifier U3 is connected to the other end of the resistor R11, and the other end of the resistor R10 is connected to One end of the capacitor C14 is connected, and the other end of the capacitor C14 is simultaneously connected to the other end of the capacitor C13, the other end of the resistor R9, the emitter of the transistor Q5, the other end of the resistor R8 and the other end of the resistor R8. The No. 2 pin of the crystal oscillator X1 is connected and grounded.

Working principle: Turn on the power supply, input 220V power supply voltage to the circuit, the electric heating glass temperature sensing control circuit works, the voltage enters the circuit through the diode D1, and the capacitor C1 conducts the voltage and safely enters the current controller U1, capacitor C2 and thermistor RT1 For protection, the thermistor RT1 can detect the temperature of the circuit, the current controller U1 transmits the signal by transmitting the signal to the transistor Q1, the transformer T1 converts the voltage, the resistor R1 and the capacitor C1 are protected, and the impedance is increased, thereby The voltage is converted into a working voltage, and at the same time, the voltage conversion is completed, and the output is turned on through the diode D2, and the electrolytic capacitor C5 is used for protection grounding; the resistor R2 and the resistor R3 are connected in series to increase the impedance, and the adjustable terminal Z1 is used to adjust the impedance. The diode D4 outputs the signal, is protected by the capacitor C6, enters the excitation module, the crystal oscillator capacitor C7 performs parallel resonance, the bidirectional diode D5 conducts the working voltage, and the transistor Q2 distributes the working voltage, which is performed by the diode D6 and the capacitor C8. The circuit voltage is transmitted through the resistor R6 for heating voltage; when there are multiple glasses for heating, the voltage is transmitted through the diode D6, the adjustable resistor Z2 cooperates with the diode D7 to detect the circuit voltage, and the capacitor C7 is used for protection, and the circuit is transmitted through the capacitor C10. It is transmitted to the current detection circuit, the transistor Q3 outputs through the diode D8 and the resistor R7, and at the same time is controlled by the adjustable resistor Z3, the transistor Q4 and the diode D11 output the current magnitude signal, and feed back to the control terminal at the same time, so that the staff can Better viewing and adjustment; when the temperature signal is transmitted, the transmission speed and accuracy are reduced due to the reasons of external equipment and internal transmission attenuation. The amplification module is used to adjust and stabilize, and the frequency of the signal is stabilized through the crystal oscillator X1. , At the same time, the transistor Q5 performs signal classification. The signal smaller than the range is amplified once, amplified by amplifier U2, and output by resistor R9 for protection. When the signal is too weak, it is amplified twice by diode D12, amplified by amplifier U3, and resistor R11. The impedance is increased with the resistor R11, so that the signal is stable, and the stable output through the capacitor C14 can make the electric heating glass stable and accurate, and improve the work efficiency.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, many technical solutions of the present invention can be carried out. These equivalent transformations all belong to the protection scope of the present invention.

Claims (6)

1. An electric heating glass temperature sensing control circuit, characterized in that, comprising: a circuit protection module, a detection module and an amplifying module; wherein the circuit protection module comprises: a protection module and an excitation module; The protection module includes: current controller U1, diode D1, capacitor C1, capacitor C2, thermistor RT1, capacitor C3, transistor Q1, resistor R1, capacitor C4, transformer T1, diode D2, electrolytic capacitor C5, resistor R2, Diode D3, diode D4, capacitor C6, resistor R3, and adjustable resistor Z1; the No. 6 pin of the current controller U1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the diode D1. The negative pole is connected, the No. 5 pin of the current controller U1 is connected to one end of the capacitor C2, the No. 7 pin of the current controller U1 is connected to one end of the thermistor RT1, and the current controller The No. 2 pin of U1 is connected to the anode of the diode D1, one end of the capacitor C3, one end of the resistor R1 and the input end of the transformer T at the same time, and the No. 1 pin of the current controller U1 is connected to The base of the transistor Q1 is connected, the No. 3 pin of the current controller U1 is connected to the emitter of the transistor Q1 and one end of the capacitor C4 at the same time, and the collector of the transistor Q1 is simultaneously connected to the diode D2. The positive electrode is connected to the input end of the transformer T1, the negative electrode of the diode D2 is connected to the other end of the capacitor C3 and the other end of the resistor R1 at the same time, and the output end of the transformer T1 is connected to the positive electrode of the diode D2. The cathode of the diode D2 is connected to the anode of the electrolytic capacitor C5, one end of the resistor R2 and one end of the resistor R3 at the same time, and the cathode of the electrolytic capacitor C5 is connected to the output of the transformer T1 and Ground, the other end of the resistor R2 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to one end of the capacitor C6 and the cathode of the diode D4 at the same time, and the other end of the resistor R3 is simultaneously connected to the The other end of the capacitor C6 is connected to one end of the adjustable resistor Z1, the adjustable end of the adjustable resistor Z1 is connected to the anode of the diode D4, and the other end of the adjustable resistor Z1 is connected to the The other end of the capacitor C4, the other end of the thermistor RT1 and the other end of the capacitor C2 are connected and grounded. 2. The electric heating glass temperature sensing control circuit according to claim 1, wherein the excitation module comprises: a crystal oscillator capacitor C7, a resistor R4, a bidirectional diode D5, a resistor R5, a transistor Q2, a capacitor C8, and a diode D6 , resistor R6; wherein one end of the crystal oscillator capacitor C7 is simultaneously connected to one end of the resistor R5 and the anode of the diode D6, and the other end of the crystal oscillator capacitor C7 is simultaneously connected to one end of the bidirectional diode D5 and the resistor. One end of R4 is connected, the other end of the resistor R5 is connected to the other end of the bidirectional diode D5 and the base of the triode Q2 at the same time, and the collector of the triode Q2 is connected to one end of the capacitor C8 at the same time, so The other end of the capacitor C8 is simultaneously connected to the cathode of the diode D6 and one end of the resistor R6, and the emitter of the transistor Q2 is simultaneously connected to the other end of the resistor R6 and the other end of the resistor R4. 3 . The temperature sensing control circuit for electrically heated glass according to claim 1 , wherein the detection module includes: overvoltage detection and overcurrent detection; wherein the overvoltage detection includes: a diode D6 , an adjustable resistor Z2, capacitor C9, bidirectional diode D7; the anode of the diode D6 is connected to one end of the adjustable resistor Z2 and one end of the capacitor C9 at the same time, and the adjustable end of the adjustable resistor Z2 is simultaneously connected to the capacitor C9 The other end of the resistor Z2 is connected to one end of the bidirectional diode D7, and the other end of the adjustable resistor Z2 is connected to the other end of the bidirectional diode D7. 4. The electric heating glass temperature sensing control circuit according to claim 3, wherein the overcurrent detection comprises: capacitor C10, adjustable resistor Z3, diode D8, resistor R7, transistor Q3, transistor Q4, diode D11, diode D10, diode D9; wherein the adjustable end of the adjustable resistor Z3 is connected to the cathode of the diode D9 and the cathode of the diode D10 at the same time, and one end of the adjustable resistor Z3 is connected to the diode D9 at the same time The anode of the transistor Q3 is connected to one end of the capacitor C10, the other end of the adjustable resistor Z3 is connected to the other end of the capacitor C10 and the cathode of the diode D8 at the same time, and the emitter of the transistor Q3 is connected to the diode at the same time. The anode of D8 is connected to one end of the resistor R7, the base of the transistor Q3 is connected to the other end of the resistor R7 and the emitter of the transistor Q4, and the collector of the transistor Q4 is connected to the transistor Q3 The collector of the transistor Q4 is connected to the anode of the diode D11, and the cathode of the diode D11 is connected to the anode of the diode D10. 5. The electric heating glass temperature sensing control circuit according to claim 1, wherein the amplifying module comprises: a crystal oscillator tube X1, a capacitor C11, a resistor R8, a triode Q5, a resistor R9, an amplifier U2, an amplifier U3, Diode D12, capacitor C12, capacitor C13, resistor R10, resistor R11, capacitor C14; wherein, the No. 3 pin of the amplifier U2 is connected to the collector of the transistor Q5 and one end of the capacitor C11 at the same time, and the transistor The base of Q5 is connected to the other end of the capacitor C11 and one end of the resistor R8 at the same time, the No. 2 pin of the amplifier U2 is connected to one end of the resistor R8 and the anode of the diode D12 at the same time, the The No. 1 pin of the amplifier U2 is simultaneously connected to one end of the capacitor C12, the negative electrode of the diode D12, one end of the capacitor C13 and the No. 5 pin of the amplifier U3, and the other end of the capacitor C12 is connected to the The No. 1 pin of the crystal oscillator X1 is connected, the No. 6 pin of the amplifier U3 is connected to one end of the resistor R11 and one end of the resistor R10 at the same time, and the No. 7 pin of the amplifier U3 is connected to the resistor. The other end of R11 is connected to the other end of the resistor R10, the other end of the capacitor C14 is connected to the other end of the capacitor C14, the other end of the capacitor C14 is connected to the other end of the capacitor C13, the other end of the resistor R9, the transistor The emitter of Q5, the other end of the resistor R8 and the No. 2 pin of the crystal oscillator X1 are connected and grounded. 6 . The temperature sensing control circuit for electrically heated glass according to claim 1 , wherein the model of the current controller U1 is M5573A. 7 .

Images