Direct current high voltage power supply circuit based on pwm driving signal

Abstract

The utility model relates to power supply equipment manufacturing technical field, specifically is a kind of structure reasonable, work stable, especially suitable for the direct current high voltage power supply circuit of printer power supply based on PWM drive signal, its characterized in that, be equipped with high voltage converter, rectifier filter circuit, comparator, sampling feedback circuit, PWM drive circuit, wherein the output end of PWM drive circuit is connected with the input end of one way of comparator, the output end of comparator is connected with high voltage converter, the output end of high voltage converter is connected with rectifier filter circuit, the signal input end of sampling feedback circuit is connected with the output end of rectifier filter circuit, the output end of sampling feedback circuit is connected with the input end of one way of comparator;The rectifier filter circuit adopts half-wave rectification filter circuit.

Description

Technical fields:

[0001] This utility model relates to the field of power supply equipment manufacturing technology, specifically a DC high-voltage power supply circuit based on PWM drive signals that has a reasonable structure, stable operation, and is particularly suitable for printer power supplies. Background technology:

[0002] With the development of electronic technology, electrical equipment has emerged, and the power supply circuits that supply power to these devices need to output stable electrical signals according to their requirements. Existing DC high-voltage power supply circuits used in printer power boards suffer from cumbersome structures and poor output signal stability; therefore, there is an urgent need for a suitable DC high-voltage power supply circuit for printers. Summary of the Invention:

[0003] This invention addresses the shortcomings and deficiencies of existing technologies by proposing a DC high-voltage power supply circuit based on PWM drive signals that is structurally sound, operates stably, and is particularly suitable for printer power supplies.

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

[0005] A DC high-voltage power supply circuit based on a PWM drive signal is characterized by comprising a high-voltage converter, a rectifier and filter circuit, a comparator, a sampling feedback circuit, and a PWM drive circuit. The output of the PWM drive circuit is connected to one input of the comparator, the output of the comparator is connected to the high-voltage converter, the output of the high-voltage converter is connected to the rectifier and filter circuit, the signal input of the sampling feedback circuit is connected to the output of the rectifier and filter circuit, and the output of the sampling feedback circuit is connected to one input of the comparator. The rectifier and filter circuit employs a half-wave rectifier and filter circuit.

[0006] The PWM drive circuit of this utility model includes a drive component comprising a MOSFET Q8, which is an N-channel MOSFET. The gate (G) of the MOSFET Q8 is connected in series with a resistor R106, and the other end of the resistor R106 is connected to the PWM signal input terminal. The source (S) of the MOSFET Q8 is grounded, and the drain (D) of the MOSFET Q8 is connected to a pull-up resistor R28. The other end of the pull-up resistor R28 is connected to a 5V high potential. A resistor R32 is connected between the resistor R106 and the PWM signal input terminal, and the other end of the resistor R32 is grounded. One end of the resistor R28 is connected to the drain of the MOSFET Q8, and the other end of the resistor R28 is connected to 5V. One end of the resistor R46 is connected to the drain of the MOSFET Q8, and the other end is connected to the input terminal of the comparator.

[0007] The comparator described in this invention is denoted as IC1. One end of resistor R46 is connected to the negative input terminal of IC1. One end of resistor R71 is connected to 5V, and the other end is connected to resistor CH+. One end of resistor CH+ is connected to resistor R51, and the other end of resistor R51 is grounded. One end of resistor R67B is connected to the positive input terminal of IC1, and the other end is connected between resistor R51 and resistor CH+. Resistor R84A and capacitor C35 are connected in series and then input to the negative input terminal of IC1. The negative terminal of Zener diode ZD6 is connected to the output terminal of IC1, and the positive terminal of Zener diode ZD6 is connected to resistor R62A. Capacitor C35 is connected in series with resistor R84A, and the other end of capacitor C35 is connected to the negative input terminal of IC1. Resistor R84A is connected to the output terminal of IC1.

[0008] The high-voltage converter described in this utility model includes a transformer T6, a transistor Q7, and a resistor R63A. The primary coil side of the transformer T6 has two coils, referred to as the first coil and the second coil. The terminals of the first coil are referred to as pin 1 and pin 3, and the terminals of the second coil are referred to as pin 2 and pin 4. The terminals of the secondary coil are referred to as pin 5 and pin 6. Resistors R62A and R63A are connected in series. The other end of resistor R63A is connected to pin 4 of the transformer T6. Pin 2 of the transformer T6 is connected to the base of the transistor Q7. The collector of the transistor Q7 is connected to pin 3 of the transformer T6. The emitter of Q7 is grounded.

[0009] The rectifier and filter circuit of this utility model includes capacitor C119, capacitor C24, diode D6, and capacitor C25. Capacitor C119 is connected between pin 5 and pin 6. Capacitor C24 is connected to the negative terminal of diode D6. The other end of capacitor C24 is connected to pin 6. The positive terminal of diode D6 is connected to capacitor C25. The other end of capacitor C25 is grounded, thus forming a half-wave rectifier circuit to ensure stable output signal.

[0010] The sampling feedback circuit of this utility model includes a resistor R190. One end of the resistor R190 is connected to the output terminal of the rectifier and filter circuit, and the other end is connected to the + input terminal of IC1 via one end of the resistor R67B. This is used to sample the output signal of the rectifier and filter circuit and send it into the comparator to complete the feedback.

[0011] In operation, this invention sends an electrical signal to the comparator via a PWM drive circuit. The other input terminal of the comparator is set with a comparison voltage value. The electrical signal output by the comparator is output through a high-voltage converter and then passes through a half-wave rectifier and filter circuit to achieve a stable high-voltage DC signal output. During this process, the electrical signal at the output terminal of the half-wave rectifier and filter circuit is sent to the comparator by a sampling feedback circuit to complete the comparison feedback, thereby improving the reliability and stability of the entire circuit.

[0012] Compared with the prior art, this utility model has significant advantages such as reasonable structure and stable operation. Attached image description:

[0013] Appendix Figure 1 This is a structural block diagram of the present invention.

[0014] Appendix Figure 2 This is a circuit schematic diagram of an embodiment of the present invention.

[0015] Figure labels: 1. High voltage converter; 2. Rectifier and filter circuit; 3. Comparator; 4. Sampling feedback circuit; 5. PWM drive circuit. Detailed implementation method:

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] As attached Figure 1 As shown, this utility model proposes a DC high-voltage power supply circuit based on a PWM drive signal, comprising a high-voltage converter 1, a rectifier and filter circuit 2, a comparator 3, a sampling feedback circuit 4, and a PWM drive circuit 5. The output terminal of the PWM drive circuit 5 is connected to one input terminal of the comparator 3, the output terminal of the comparator 3 is connected to the high-voltage converter 1, the output terminal of the high-voltage converter 1 is connected to the rectifier and filter circuit 2, the signal input terminal of the sampling feedback circuit 4 is connected to the output terminal of the rectifier and filter circuit 2, and the output terminal of the sampling feedback circuit 4 is connected to one input terminal of the comparator 3. The rectifier and filter circuit 2 adopts a half-wave rectifier and filter circuit.

[0018] Example:

[0019] As attached Figure 2 As shown, this example proposes a DC high-voltage power supply circuit based on PWM drive signal, which includes a high-voltage converter 1, a rectifier and filter circuit 2, a comparator 3, a sampling feedback circuit 4, and a PWM drive circuit 5.

[0020] The PWM drive circuit 5 includes a drive component including a MOSFET Q8, which is an N-channel MOSFET. The gate (G) of the MOSFET Q8 is connected in series with a resistor R106, and the other end of the resistor R106 is connected to the PWM signal input terminal. The source (S) of the MOSFET Q8 is grounded, and the drain (D) of the MOSFET Q8 is connected to a pull-up resistor R28. The other end of the pull-up resistor R28 is connected to a 5V high potential. A resistor R32 is connected between the resistor R106 and the PWM signal input terminal, and the other end of the resistor R32 is grounded. One end of the resistor R28 is connected to the drain of the MOSFET Q8, and the other end of the resistor R28 is connected to 5V. One end of the resistor R46 is connected to the drain of the MOSFET Q8, and the other end is connected to the input terminal of the comparator.

[0021] The comparator 3 is denoted as IC1. One end of resistor R46 is connected to the negative input terminal of IC1. One end of resistor R71 is connected to 5V, and the other end is connected to resistor CH+. One end of resistor CH+ is connected to resistor R51, and the other end of resistor R51 is grounded. One end of resistor R67B is connected to the positive input terminal of IC1, and the other end is connected between resistor R51 and resistor CH+. Resistor R84A and capacitor C35 are connected in series and then input to the negative input terminal of IC1. The negative terminal of Zener diode ZD6 is connected to the output terminal of IC1, and the positive terminal of Zener diode ZD6 is connected to resistor R62A. Capacitor C35 is connected in series with resistor R84A, and the other end of capacitor C35 is connected to the negative input terminal of IC1. Resistor R84A is connected to the output terminal of IC1.

[0022] The high-voltage converter 1 described in this example includes a transformer T6, a transistor Q7, and a resistor R63A. The primary winding of the transformer T6 has two coils, referred to as the first coil and the second coil. The terminals of the first coil are referred to as pin 1 and pin 3, and the terminals of the second coil are referred to as pin 2 and pin 4. The terminals of the secondary coil are referred to as pin 5 and pin 6. Resistors R62A and R63A are connected in series. The other end of resistor R63A is connected to pin 4 of the transformer T6. Pin 2 of the transformer T6 is connected to the base of the transistor Q7. The collector of the transistor Q7 is connected to pin 3 of the transformer T6. The emitter of Q7 is grounded.

[0023] The rectifier and filter circuit 2 includes capacitor C119, capacitor C24, diode D6, and capacitor C25. Capacitor C119 is connected between pin 5 and pin 6. Capacitor C24 is connected to the negative terminal of diode D6. The other end of capacitor C24 is connected to pin 6. The positive terminal of diode D6 is connected to capacitor C25. The other end of capacitor C25 is grounded, thus forming a half-wave rectifier circuit to ensure stable output signal.

[0024] The sampling feedback circuit 4 includes a resistor R190. One end of the resistor R190 is connected to the output of the rectifier and filter circuit, and the other end is connected to the + input of IC1 via one end of the resistor R67B. This is used to sample the output signal of the rectifier and filter circuit 2 and send it into the comparator to complete the feedback.

[0025] In operation, this invention sends an electrical signal to the comparator via a PWM drive circuit. The other input terminal of the comparator is set with a comparison voltage value. The electrical signal output by the comparator is output through a high-voltage converter and then passes through a half-wave rectifier and filter circuit to achieve a stable high-voltage DC signal output. During this process, the electrical signal at the output terminal of the half-wave rectifier and filter circuit is sent to the comparator by a sampling feedback circuit to complete the comparison feedback, thereby improving the reliability and stability of the entire circuit.

[0026] Compared with the prior art, this utility model has significant advantages such as reasonable structure and stable operation.

Claims

1. A DC high-voltage power supply circuit based on PWM drive signal, characterized in that, The circuit includes a high-voltage converter, a rectifier and filter circuit, a comparator, a sampling feedback circuit, and a PWM drive circuit. The output of the PWM drive circuit is connected to one input of the comparator, the output of the comparator is connected to the high-voltage converter, the output of the high-voltage converter is connected to the rectifier and filter circuit, the signal input of the sampling feedback circuit is connected to the output of the rectifier and filter circuit, and the output of the sampling feedback circuit is connected to one input of the comparator. The rectifier and filter circuit is a half-wave rectifier and filter circuit.

2. The DC high-voltage power supply circuit based on PWM drive signal according to claim 1, characterized in that, The PWM drive circuit includes a drive component comprising a MOSFET Q8, which is an N-channel MOSFET. The gate (G) of the MOSFET Q8 is connected in series with a resistor R106, the other end of which is connected to the PWM signal input terminal. The source (S) of the MOSFET Q8 is grounded, and the drain (D) of the MOSFET Q8 is connected to a pull-up resistor R28, the other end of which is connected to a 5V high potential. A resistor R32 is connected between the resistor R106 and the PWM signal input terminal, the other end of which is grounded. One end of the resistor R28 is connected to the drain of the MOSFET Q8, and the other end is connected to 5V. One end of the resistor R46 is connected to the drain of the MOSFET Q8, and the other end is connected to the input terminal of the comparator.

3. The DC high-voltage power supply circuit based on PWM drive signal according to claim 1, characterized in that, The comparator is denoted as IC1. One end of resistor R46 is connected to the negative input terminal of IC1. One end of resistor R71 is connected to 5V, and the other end is connected to resistor CH+. One end of resistor CH+ is connected to resistor R51, and the other end of resistor R51 is grounded. One end of resistor R67B is connected to the positive input terminal of IC1, and the other end is connected between resistor R51 and resistor CH+. Resistor R84A and capacitor C35 are connected in series and then input to the negative input terminal of IC1. The negative terminal of Zener diode ZD6 is connected to the output terminal of IC1, and the positive terminal of Zener diode ZD6 is connected to resistor R62A. Capacitor C35 is connected in series with resistor R84A, and the other end of capacitor C35 is connected to the negative input terminal of IC1. Resistor R84A is connected to the output terminal of IC1.

4. The DC high-voltage power supply circuit based on PWM drive signal according to claim 1, characterized in that, The high-voltage converter includes a transformer T6, a transistor Q7, and a resistor R63A. The primary winding of the transformer T6 has two coils, referred to as the first coil and the second coil. The terminals of the first coil are labeled as pin 1 and pin 3, and the terminals of the second coil are labeled as pin 2 and pin 4. The terminals of the secondary coil are labeled as pin 5 and pin 6. Resistors R62A and R63A are connected in series. The other end of resistor R63A is connected to pin 4 of the transformer T6. Pin 2 of the transformer T6 is connected to the base of the transistor Q7. The collector of the transistor Q7 is connected to pin 3 of the transformer T6. The emitter of Q7 is grounded.

5. The DC high-voltage power supply circuit based on PWM drive signal according to claim 1, characterized in that, The rectifier and filter circuit includes capacitor C119, capacitor C24, diode D6, and capacitor C25. Capacitor C119 is connected between pin 5 and pin 6. Capacitor C24 is connected to the negative terminal of diode D6, and the other end of capacitor C24 is connected to pin 6. The positive terminal of diode D6 is connected to capacitor C25, and the other end of capacitor C25 is grounded, thus forming a half-wave rectifier circuit to ensure stable output signal.

6. The DC high-voltage power supply circuit based on PWM drive signal according to claim 1, characterized in that, The sampling feedback circuit includes a resistor R190. One end of the resistor R190 is connected to the output of the rectifier and filter circuit, and the other end is connected to the + input of IC1 via one end of resistor R67B. This is used to sample the output signal of the rectifier and filter circuit and send it into the comparator to complete the feedback.

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