CN-224233558-U - DC high-voltage power supply circuit

CN224233558UCN 224233558 UCN224233558 UCN 224233558UCN-224233558-U

Abstract

The utility model relates to the technical field of power supply equipment manufacture, in particular to a direct-current high-voltage power supply circuit which has reasonable structure and stable operation and is particularly suitable for a power supply for a printer, and is characterized by comprising a high-voltage converter, a rectifying and filtering circuit, a comparator, a sampling feedback circuit and a PWM driving circuit, the output end of the PWM driving circuit is connected with one input end of the comparator, the output end of the comparator is connected with the high-voltage converter, the output end of the high-voltage converter is connected with the rectifying and filtering circuit, the signal input end of the sampling feedback circuit is connected with the output end of the rectifying and filtering circuit, and the output end of the sampling feedback circuit is connected with one input end of the comparator.

Inventors

FANG ZHENGYONG
JING YUXIA
Jing Tongchun

Assignees

山东新康威电子有限公司

Dates

Publication Date: 20260512
Application Date: 20250427

Claims (8)

1. The direct-current high-voltage power supply circuit is characterized by comprising a high-voltage converter, a rectifying and filtering circuit, a comparator, a sampling feedback circuit and a PWM driving circuit, wherein the output end of the PWM driving circuit is connected with one input end of the comparator, the output end of the comparator is connected with the high-voltage converter, the output end of the high-voltage converter is connected with the rectifying and filtering circuit, the signal input end of the sampling feedback circuit is connected with the output end of the rectifying and filtering circuit, and the output end of the sampling feedback circuit is connected with one input end of the comparator.
2. The direct-current high-voltage power supply circuit according to claim 1, further comprising a constant-current overvoltage protection circuit, wherein an input end of the constant-current overvoltage protection circuit is connected with an output end of the rectifying and filtering circuit, and an output end of the constant-current overvoltage protection circuit is connected with an output end of the sampling feedback circuit.
3. The direct current high voltage power supply circuit according to claim 1, wherein a MOS transistor Q9 is provided in the PWM driving circuit, the MOS transistor Q9 is of an N-channel type, a G electrode of the MOS transistor Q9 is connected in series with a resistor R50, the other end of the resistor R50 is connected to a PWM signal input terminal, an S electrode of the MOS transistor Q9 is grounded, a D electrode of the MOS transistor Q9 is connected to a pull-up resistor R42, the other end of the pull-up resistor R42 is connected to a high potential 5V, a resistor R52A is connected between the resistor R50 and the PWM signal input terminal, after the resistor R33 and the resistor R43A are connected in series, the other end of the resistor R43A is connected to a +input terminal of the comparator circuit, the other end of the resistor R33 is connected to a D electrode of the MOS transistor, one end of the resistor R26 is connected to a high potential +5v, the other end of the resistor is connected in series with tra+ and the resistor R34 in order, the other end of the resistor R34 is grounded, a capacitor C46 is connected in parallel with the resistor R46, a non-grounded end of the resistor R34 is connected between the resistor R33 and the resistor R43A, and after the resistor R26 and the resistor r+ are connected in series, and the PWM signal is input to the PWM circuit.
4. The direct current high voltage power supply circuit according to claim 1, wherein the comparator is denoted as IC1, the positive input terminal of the comparator is connected to the resistor R43A, the negative input terminal of the comparator is connected to the resistor R98, the other end of the resistor R98 is connected between the resistor R99 and the resistor R107 in the PWM driving circuit, the positive input terminal of the comparator is further connected to one end of the resistor R108, the resistor R108 is connected in series with the capacitor C48, the other end of the capacitor C48 is connected to the output terminal of the comparator, the output terminal of the comparator is connected to the negative electrode of the zener diode ZD2A, and a comparison voltage is set by the resistor R107 and the resistor R98 when the comparator is in operation, so that the comparison of the electric signals input from the positive input terminal is completed.
5. The dc high voltage power supply circuit according to claim 1, wherein a transformer is provided in the high voltage converter, two sets of coils are provided on a primary side of the transformer, the two sets of coils are respectively denoted as a first coil and a second coil, a terminal pin of the first coil is denoted as a terminal pin 1 and a terminal pin 4, a terminal pin of the second coil is denoted as a terminal pin 2 and a terminal pin 3, two terminal pins of a secondary coil of the transformer are denoted as a terminal pin 5 and a terminal pin 6, a triode Q12 is further provided in the high voltage converter, Q12 adopts an NPN type, wherein a pole B of the triode Q12 is connected with the terminal pin 2, a pole C is connected with the terminal pin 4, a pole E is grounded, a resistor R104 is connected with the terminal pin 3 in series, a terminal pin 1 is connected with +24v, one end of a capacitor C47 is grounded, the other end of the resistor R104 is connected between the resistor R105, and the other end of the resistor R104 is connected with a positive electrode of the zener diode ZD 2A.
6. The direct-current high-voltage power supply circuit according to claim 1, wherein the rectifying and filtering circuit adopts a multi-stage rectifying and filtering circuit, the multi-stage rectifying and filtering circuit comprises a primary rectifying and filtering circuit formed by a diode D11 and a capacitor C42, a secondary rectifying and filtering circuit formed by a diode D12 and a capacitor C40, and a tertiary rectifying and filtering circuit formed by a diode D10 and a capacitor C43, a capacitor C113 is connected in series between a secondary side terminal pin 5 and a terminal pin 6 of the transformer, the primary rectifying and filtering circuit is connected with the capacitor C113 in parallel, the secondary rectifying and filtering circuit is connected with the primary rectifying and filtering circuit in parallel, one end of a resistor R96 is connected between a negative electrode of the D10 and the capacitor C43 in the tertiary rectifying and filtering circuit, and the other end of the resistor R96 outputs an electric signal.
7. The dc high voltage power supply circuit according to claim 1, wherein a zener diode ZD3, a zener diode ZD4, a diode D5 and an inductor are disposed in the sampling feedback circuit, wherein the positive electrode of the zener diode ZD3 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to one end of the inductor, the other end of the inductor is grounded, the negative electrode of the zener diode ZD3 is connected to the comparator+ input end via a resistor R43A, the positive electrode of the zener diode ZD4 is connected to the negative electrode of the zener diode ZD3, the negative electrode of the zener diode ZD4 is connected to the terminal pin 6 on the secondary side of the transformer, and the output end signal of the high voltage converter is sampled and fed into the comparator to complete the feedback.
8. The direct current high voltage power supply circuit according to claim 2, wherein the constant current overvoltage protection circuit comprises a zener diode ZD5, a diode D81 and a capacitor C4, wherein the cathode of the zener diode ZD5 is connected with the cathode of the zener diode ZD4, the anode of the zener diode ZD5 is connected with the anode of the diode D81, the cathode of the diode D81 is grounded, one end of the capacitor C4 is grounded, and the other end of the capacitor C4 is connected with the cathode of the zener diode ZD5 for constant current overvoltage protection of the sampling feedback circuit.

Description

DC high-voltage power supply circuit Technical field: The utility model relates to the technical field of power supply equipment manufacture, in particular to a direct-current high-voltage power supply circuit which is reasonable in structure and stable in operation and is particularly suitable for a power supply for a printer. The background technology is as follows: Along with the development of electronic technology, electric equipment is generated, and a power circuit for supplying power to the electric equipment is required to output stable electric signals according to the requirements of the electric equipment. The direct-current high-voltage power supply circuit adopted in the traditional power supply of the printer has the problems of complex structure and poor stability of output electric signals, so that the direct-current high-voltage power supply circuit suitable for the power supply of the printer is needed. The invention comprises the following steps: Aiming at the defects and shortcomings in the prior art, the utility model provides a direct-current high-voltage power supply circuit which is reasonable in structure and stable in operation and is particularly suitable for a power supply for a printer. The utility model is achieved by the following measures: The direct-current high-voltage power supply circuit is characterized by comprising a high-voltage converter, a rectifying and filtering circuit, a comparator, a sampling feedback circuit and a PWM driving circuit, wherein the output end of the PWM driving circuit is connected with one input end of the comparator, the output end of the comparator is connected with the high-voltage converter, the output end of the high-voltage converter is connected with the rectifying and filtering circuit, the signal input end of the sampling feedback circuit is connected with the output end of the rectifying and filtering circuit, and the output end of the sampling feedback circuit is connected with one input end of the comparator. The utility model is also provided with a constant-current overvoltage protection circuit, the input end of the constant-current overvoltage protection circuit is connected with the output end of the rectifying and filtering circuit, and the output end of the constant-current overvoltage protection circuit is connected with the output end of the sampling feedback circuit and is used for protecting the circuit. The PWM driving circuit is provided with a MOS tube O9, an N-channel type MOS tube Q9 is adopted, a G electrode of the MOS tube Q9 is connected with a resistor R50 in series, the other end of the resistor R50 is connected with a PWM signal input end, an S electrode of the MOS tube O9 is grounded, a D electrode of the MOS tube 09 is connected with a pull-up resistor R42, the other end of the pull-up resistor R42 is connected with a 5V high potential, a resistor R52A is connected between the resistor R50 and the PWM signal input end, after the resistor R33 is connected with the resistor R43A in series, the other end of the resistor R33 is connected with the D electrode of the MOS tube, one end of the resistor R26 is connected with a +5V high potential, the other end of the resistor R34 is connected with TRA+ in series in sequence, the other end of the resistor R34 is grounded, a capacitor C46 is connected with the resistor R107 is connected with the capacitor C46 in parallel, a non-grounded end of the resistor R34 is connected between the resistor R33 and the resistor R43A, the resistor R26 and TRA+ is connected in series, the resistor R99 is connected with the resistor in parallel, and a signal is input from one end of the resistor R50 and the subsequent PWM driving circuit is completed. The comparator is marked as IC1, the positive input end of the comparator is connected with a resistor R43A, the negative input end of the comparator is connected with a resistor R98, the other end of the resistor R98 is connected between a resistor R99 and a resistor R107 in the PWM driving circuit, the positive input end of the comparator is also connected with one end of a resistor R108, the resistor R108 is connected with a capacitor C48 in series, the other end of the capacitor C48 is connected with the output end of the comparator, the output end of the comparator is connected with the negative electrode of a voltage stabilizing diode ZD2A, and when the comparator works, a comparison voltage is set through the resistor R107 and the resistor R98, so that the comparison processing of an electric signal input by the positive input end is completed. The high-voltage converter is internally provided with a transformer, the primary side of the transformer is provided with two groups of coils which are respectively marked as a first coil and a second coil, the end pin of the first coil is marked as an end pin 1 and an end pin 4, the end pin of the second coil is marked as an end pin 2 and an end pin 3, the two end pins of the secondary coi