High-quality square wave signal generating device

Abstract

The utility model relates to the technical field of electronic circuits, in particular to a high-quality square wave signal generating device which is reasonable in structure, low in cost and stable in signal output, and is characterized by being provided with a push-pull driving circuit for driving a transformer to work, the transformer, a rectifying and filtering circuit and a comparison circuit, wherein the push-pull drive circuit is connected with a primary coil end of the transformer, the rectification filter circuit is connected with a secondary coil end of the transformer, and the comparison circuit is connected with the rectification filter circuit.

Description

Technical fields:

[0001] This utility model relates to the field of electronic circuit technology, specifically to a high-quality square wave signal generating device with reasonable structure, low cost, and stable signal output. Background technology:

[0002] In the current power supply field, different devices require different power supplies. Laser printers are devices that require a square wave AC voltage to drive them. Existing square wave generation circuits used in laser printers have complex structures and produce poor quality square waves. Summary of the Invention:

[0003] This invention addresses the shortcomings and deficiencies of existing technologies by proposing a high-quality square wave signal generation device with a reasonable structure, low cost, and stable signal output.

[0004] This utility model achieves its purpose through the following measures:

[0005] A high-quality square wave signal generating device is characterized by comprising a push-pull drive circuit for driving a transformer, a transformer, a rectifier and filter circuit, and a comparator circuit, wherein the push-pull drive circuit is connected to the primary coil of the transformer, the rectifier and filter circuit is connected to the secondary coil of the transformer, and the comparator circuit is connected to the rectifier and filter circuit.

[0006] The push-pull drive circuit of this utility model includes transistor Q1, transistor Q2, diode D1, and capacitor C1. Transistor Q1 is NPN type, transistor Q2 is PNP type, and transistors Q1 and Q2 form a push-pull circuit. Zener diode D1 is connected between the emitter and collector of transistor Q2. After capacitor C1 is connected to the cathode of Zener diode D1, its other end is connected to the primary coil of transformer. The other end of the primary coil of transformer is grounded.

[0007] The push-pull drive circuit of this utility model also includes a transistor Q3, which is an NPN type. The base of transistor Q3 is connected in series with resistor R1. The other end of resistor R1 is connected to the PWM signal input terminal. The emitter of transistor Q3 is grounded. The collector of transistor Q3 is connected to pull-up resistor R2. The other end of pull-up resistor R2 is connected to a 24V high potential. Resistor R3 is connected between resistor R1 and the PWM signal input terminal. Resistor R3 and resistor R4 are connected in series. The other end of resistor R4 is connected to +24V. One end of resistor R5 is connected between resistors R3 and R4, and the other end is grounded. The emitter of transistor Q3 is grounded. Resistors R7 and R6 are connected in parallel and then in series with resistor R8. The other end of resistor R8 is connected to the base of transistor Q2. The other ends of resistors R7 and R6 are both grounded. One end of resistor R9 is connected to the base of transistor Q1, and the other end is connected to the collector of transistor Q2.

[0008] The secondary coil of the transformer described in this utility model is connected to a rectifier and filter circuit. The rectifier and filter circuit includes a diode D2, a capacitor C2, and a capacitor C3. The positive terminal of the diode D2 is connected to one end of the secondary coil, and the other end of the secondary coil is grounded. The negative terminal of the diode D2 is connected in series with the capacitors C2 and C3 and then grounded.

[0009] The comparator circuit described in this utility model includes a comparator C1. The +Vcc terminal of comparator C1 is connected to 24V, and the -Vcc terminal is grounded. The +Vcc terminal is also connected to capacitor C6, the other end of which is grounded. The output terminal of comparator C1 is connected to the rectifier-filter circuit. The non-inverting input terminal of comparator C1 is connected to resistor R10, the other end of which is grounded. The inverting input terminal of the comparator is connected to resistor R11 and capacitor C4. Resistor R11 is connected to one end of capacitor C5, the other end of which is grounded. The other end of capacitor C4 is connected in series with resistor R12, and the other end of resistor R12 is connected to the output terminal of comparator C1. Resistors R13 and R14 are also included. Resistors R13 and R14 are connected in series and then in parallel with capacitor C5. One end of capacitor C7 is grounded, and the other end is connected in series with resistors R18 and R19.

[0010] +3.3V, one end of resistor R20 is connected to +3.3V, and the other end is connected to the junction of resistors R11 and R14. The signal input terminal of the comparator circuit is connected to the PWM signal output terminal. There is a MOSFET Q4. The gate of MOSFET Q4 is connected to resistor R21. The other end of resistor R21 is connected to the PWM signal output terminal. The gate of MOSFET Q4 is also connected to pull-down resistor R22. The other end of resistor R22 is grounded. The source of MOSFET Q4 is grounded. The drain is connected to +3.3V through pull-up resistor R23. The drain of MOSFET Q4 is also connected to one end of resistor R24. The other end of resistor R24 ​​is connected in series with resistor R11 and then connected to the inverting input terminal of comparator C1.

[0011] This invention, through the coordinated operation of a push-pull drive circuit, a transformer, a rectifier filter circuit, and a comparator circuit, can ensure the stable quality of the output square wave signal, thereby meeting the power supply requirements of electronic equipment. It has significant advantages such as reasonable structure and stable operation. Attached image description:

[0012] Appendix Figure 1 This is a structural block diagram of the present invention.

[0013] Appendix Figure 2 This is a circuit diagram of one embodiment of the push-pull drive circuit and rectifier filter circuit in this utility model.

[0014] Appendix Figure 3 This is a circuit diagram of one embodiment of the comparison circuit in this utility model.

[0015] Appendix Figure 4 This is a circuit schematic diagram of an embodiment of the present invention.

[0016] Figure labels: 1. Push-pull drive circuit; 2. Transformer; 3. Rectifier and filter circuit; 4. Comparator circuit. Detailed implementation method:

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example:

[0019] This example provides a high-quality square wave signal generating device, which includes a push-pull drive circuit 1 for driving the transformer, a transformer 2, a rectifier and filter circuit 3, and a comparator circuit 4. The push-pull drive circuit 1 is connected to the primary coil of the transformer 2, the rectifier and filter circuit 3 is connected to the secondary coil of the transformer 2, and the comparator circuit 4 is connected to the rectifier and filter circuit 3.

[0020] As attached Figure 2 As shown, the push-pull drive circuit described in this example includes transistor Q1, transistor Q2, diode D1, and capacitor C1. Transistor Q1 is NPN type, and transistor Q2 is PNP type. Transistors Q1 and Q2 form a push-pull circuit. Zener diode D1 is connected between the emitter and collector of transistor Q2. After capacitor C1 is connected to the cathode of Zener diode D1, the other end of capacitor C1 is connected to the primary coil of transformer. The other end of the primary coil of transformer is grounded.

[0021] The push-pull drive circuit described in this example also includes transistor Q3, which is an NPN type. The base of transistor Q3 is connected in series with resistor R1, and the other end of resistor R1 is connected to the PWM signal input terminal. The emitter of transistor Q3 is grounded, and the collector of transistor Q3 is connected to pull-up resistor R2. The other end of pull-up resistor R2 is connected to a 24V high potential. Resistor R3 is connected between resistor R1 and the PWM signal input terminal. Resistor R3 and resistor R4 are connected in series, and the other end of resistor R4 is connected to +24V. One end of resistor R5 is connected between resistor R3 and resistor R4, and the other end is grounded. The emitter of transistor Q3 is grounded. Resistors R7 and R6 are connected in parallel and then in series with resistor R8. The other end of resistor R8 is connected to the base of transistor Q2. The other ends of resistors R7 and R6 are both grounded. One end of resistor R9 is connected to the base of transistor Q1, and the other end is connected to the collector of transistor Q2.

[0022] As attached Figure 2As shown, the secondary coil of the transformer in this example is connected to a rectifier and filter circuit. The rectifier and filter circuit includes a diode D2, a capacitor C2, and a capacitor C3. The positive terminal of the diode D2 is connected to one end of the secondary coil, and the other end of the secondary coil is grounded. The negative terminal of the diode D2 is connected in series with the capacitors C2 and C3 and then grounded.

[0023] As attached Figure 3 As shown, the comparison circuit in this example includes a comparator C1. The +Vcc terminal of comparator C1 is connected to 24V, the -Vcc terminal is grounded, and the +Vcc terminal is also connected to capacitor C6. The other end of capacitor C6 is grounded. The output terminal of comparator C1 is connected to the rectifier-filter circuit. The non-inverting input terminal of comparator C1 is connected to resistor R10, the other end of which is grounded. The inverting input terminal of the comparator is connected to resistor R11 and capacitor C4. Resistor R11 is connected to one end of capacitor C5, the other end of which is grounded. The other end of capacitor C4 is connected in series with resistor R12, and the other end of resistor R12 is connected to the output terminal of comparator C1. Resistors R13 and R14 are also included. Resistors R13 and R14 are connected in series and then in parallel with capacitor C5. Capacitor C7... One end of the comparator is grounded, and the other end is connected in series with resistors R18 and R19 to +3.3V. One end of resistor R20 is connected to +3.3V, and the other end is connected to the junction of resistors R11 and R14. The signal input terminal of the comparator circuit is connected to the PWM signal output terminal. A MOSFET Q4 is included. The gate of MOSFET Q4 is connected to resistor R21, and the other end of resistor R21 is connected to the PWM signal output terminal. The gate of MOSFET Q4 is also connected to pull-down resistor R22, and the other end of resistor R22 is grounded. The source of MOSFET Q4 is grounded, and the drain is connected to +3.3V via pull-up resistor R23. The drain of MOSFET Q4 is also connected to one end of resistor R24, and the other end of resistor R24 ​​is connected in series with resistor R11 and then connected to the inverting input terminal of comparator C1.

[0024] This invention, through the coordinated operation of a push-pull drive circuit, a transformer, a rectifier filter circuit, and a comparator circuit, can ensure the stable quality of the output square wave signal, thereby meeting the power supply requirements of electronic equipment. It has significant advantages such as reasonable structure and stable operation.

Claims

1. A high-quality square wave signal generating device, characterized in that, The system includes a push-pull drive circuit for driving the transformer, a transformer, a rectifier and filter circuit, and a comparator circuit. The push-pull drive circuit is connected to the primary coil of the transformer, the rectifier and filter circuit is connected to the secondary coil of the transformer, and the comparator circuit is connected to the rectifier and filter circuit.

2. The high-quality square wave signal generating device according to claim 1, characterized in that, The push-pull drive circuit includes transistor Q1, transistor Q2, diode D1, and capacitor C1. Transistor Q1 is NPN type, and transistor Q2 is PNP type. Transistors Q1 and Q2 form a push-pull circuit. Zener diode D1 is connected between the emitter and collector of transistor Q2. After capacitor C1 is connected to the cathode of Zener diode D1, its other end is connected to the primary coil of transformer. The other end of the primary coil of transformer is grounded.

3. The high-quality square wave signal generating device according to claim 2, characterized in that, The push-pull drive circuit also includes a transistor Q3, which is an NPN type. The base (b) of transistor Q3 is connected in series with resistor R1, and the other end of resistor R1 is connected to the PWM signal input terminal. The emitter (e) of transistor Q3 is grounded, and the collector (c) of transistor Q3 is connected to a pull-up resistor R2. The other end of pull-up resistor R2 is connected to a 24V high potential. Resistor R3 is connected between resistor R1 and the PWM signal input terminal. Resistor R3 and resistor R4 are connected in series, and the other end of resistor R4 is connected to +24V. One end of resistor R5 is connected between resistors R3 and R4, and the other end is grounded. The emitter of transistor Q3 is grounded. Resistors R7 and R6 are connected in parallel and then in series with resistor R8. The other end of resistor R8 is connected to the base of transistor Q2. The other ends of resistors R7 and R6 are both grounded. One end of resistor R9 is connected to the base of transistor Q1, and the other end is connected to the collector of transistor Q2.

4. The high-quality square wave signal generating device according to claim 1, characterized in that, The secondary coil of the transformer is connected to a rectifier and filter circuit, which includes a diode D2, a capacitor C2, and a capacitor C3. The positive terminal of the diode D2 is connected to one end of the secondary coil, and the other end of the secondary coil is grounded. The negative terminal of the diode D2 is connected in series with the capacitors C2 and C3 and then grounded.

5. The high-quality square wave signal generating device according to claim 1, characterized in that, The comparison circuit includes a comparator C1. The +Vcc terminal of comparator C1 is connected to 24V, and the -Vcc terminal is grounded. The +Vcc terminal is also connected to capacitor C6, the other end of which is grounded. The output of comparator C1 is connected to the rectifier-filter circuit. The non-inverting input of comparator C1 is connected to resistor R10, the other end of which is grounded. The inverting input of the comparator is connected to resistor R11 and capacitor C4. Resistor R11 is connected to one end of capacitor C5, the other end of which is grounded. The other end of capacitor C4 is connected in series with resistor R12, the other end of which is connected to the output of comparator C1. Resistors R13 and R14 are also included. Resistors R13 and R14 are connected in series and then in parallel with capacitor C5. One end of capacitor C7 is grounded. The other end is connected in series with resistors R18 and R19 and then connected to +3.3V. One end of resistor R20 is connected to +3.3V, and the other end is connected to the junction of resistors R11 and R14. The signal input terminal of the comparator circuit is connected to the PWM signal output terminal. There is a MOSFET Q4. The gate of MOSFET Q4 is connected to resistor R21. The other end of resistor R21 is connected to the PWM signal output terminal. The gate of MOSFET Q4 is also connected to pull-down resistor R22. The other end of resistor R22 is grounded. The source of MOSFET Q4 is grounded. The drain is connected to +3.3V through pull-up resistor R23. The drain of MOSFET Q4 is also connected to one end of resistor R24. The other end of resistor R24 ​​is connected in series with resistor R11 and then connected to the inverting input terminal of comparator C1.

Images