CN213342004U - Novel high-voltage starting circuit - Google Patents
Novel high-voltage starting circuit Download PDFInfo
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- CN213342004U CN213342004U CN202022376993.6U CN202022376993U CN213342004U CN 213342004 U CN213342004 U CN 213342004U CN 202022376993 U CN202022376993 U CN 202022376993U CN 213342004 U CN213342004 U CN 213342004U
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Abstract
The utility model relates to a switching DC power supply technical field discloses a novel high-voltage starting circuit, including depletion type MOS pipe, enhancement mode NMOS pipe and main control chip PWM, depletion type NMOS pipe M1' S drain electrode D links to each other with electric capacity C1 one end, input VIN, source S links to each other with resistance R5 one end, grid G links to each other with resistance R1 and resistance R4 one end; the other end of the resistor R1 is connected with the drain D of the enhanced NMOS tube, and the grid G of the enhanced NMOS tube is connected with the resistor R2 and the resistor R3; the other end of the resistor R2 is connected with the PWM input end of the main control chip, the other ends of the resistor R4 and the resistor R5 are connected with the PWM output end of the main control chip, and the output end of the main control chip is connected with a common ground terminal through a voltage regulator tube D1 and an energy storage capacitor C2; the utility model discloses can effectively improve DC power supply high pressure activation time and reduce the system consumption, its commonality is strong, the integrated level is high, simple structure, reliable, reasonable in design.
Description
Technical Field
The utility model belongs to the technical field of the switch DC power supply technique and specifically relates to a novel high-voltage starting circuit.
Background
In the high-voltage switch power supply system, the main control chip is powered through the high-voltage starting circuit to ensure the normal work of the chip, and the auxiliary winding supplies power to the chip after the chip works normally, so that the power consumption of the system is reduced conveniently. The traditional high-voltage starting circuit consists of a current-limiting resistor and an energy-storing capacitor, the current-limiting resistor needs to consider power consumption, the starting time is inconvenient to control, and the circuit universality is low.
Disclosure of Invention
In order to solve the problem, the utility model aims at providing a DC power supply high-voltage starting circuit that the commonality is strong, the integrated level is high, simple structure, the control of being convenient for only need less peripheral device to can improve DC power supply's start-up time and system power consumption effectively.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a novel high-voltage starting circuit comprises a depletion type MOS tube, an enhancement type NMOS tube, a voltage regulator tube D1 and a main control chip PWM, wherein a drain electrode D of the depletion type NMOS tube M1 is connected with one end of a capacitor C1 and an input end VIN, a source electrode S is connected with one end of a resistor R5, and a grid electrode G is connected with one ends of a resistor R1 and a resistor R4; the other end of the resistor R1 is connected with the drain D of the enhanced NMOS tube, and the grid G of the enhanced NMOS tube is connected with the resistor R2 and the resistor R3; the other end of the resistor R2 is connected with the PWM input end of the main control chip, the other ends of the resistor R4 and the resistor R5 are connected with the PWM output end of the main control chip and the auxiliary winding power supply port VAUX, and the PWM output end of the main control chip is connected with the GND end of the common ground wire through a voltage-regulator tube D1 and an energy-storage capacitor C2; the capacitor C1, the other end of the resistor R3, the source electrode S end of the enhanced NMOS tube and the GND end of the main control chip PWM are connected with a common ground wire GND.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the utility model provides a novel high pressure starting circuit, adopts depletion type NMOS pipe, when NMOS pipe GS voltage is 0V, keeps switching on between the DS, and conduction current is about tens milliamperes, charges for electric capacity through resistance, and when the capacitor voltage was higher than main control chip's opening voltage, main control chip normally worked. The high-voltage starting circuit has the advantages of strong universality, high integration level, simple and reliable structure and reasonable design. The direct-current power supply high-voltage starting circuit convenient to control can effectively improve the direct-current power supply high-voltage starting time and reduce the system power consumption.
Drawings
Fig. 1 is a schematic diagram of a novel high voltage start-up circuit.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a novel high-voltage start-up circuit includes a depletion type MOS transistor, an enhancement type NMOS transistor, a voltage regulator D1 and a main control chip PWM, a drain D of the depletion type NMOS transistor M1 is connected to one end of a capacitor C1 and an input terminal VIN, a source S is connected to one end of a resistor R5, and a gate G is connected to one ends of a resistor R1 and a resistor R4; the other end of the resistor R1 is connected with the drain D of the enhanced NMOS tube, and the grid G of the enhanced NMOS tube is connected with the resistor R2 and the resistor R3; the other end of the resistor R2 is connected with the PWM input end of the main control chip, the other ends of the resistor R4 and the resistor R5 are connected with the PWM output end of the main control chip and the auxiliary winding power supply port VAUX, and the PWM output end of the main control chip is connected with the GND end of the common ground wire through a voltage-regulator tube D1 and an energy-storage capacitor C2; the capacitor C1, the other end of the resistor R3, the source electrode S end of the enhanced NMOS tube and the GND end of the main control chip PWM are connected with a common ground wire GND.
M1 turns on DS when the gate-source voltage GS is 0V, and M1 is equivalently a constant current source. The energy storage electric energy C2 is connected with a resistor R4, a current limiting resistor R5, a voltage regulator tube D1 and an auxiliary winding power supply port VAUX. The drain D of the enhancement NMOS transistor M2 is connected to one end of a resistor R1, the source S is connected to the GND terminal, and the gate G is connected to a resistor R2 and a resistor R3.
The input voltage range of the circuit is 100V-800V direct current voltage. The MOS transistor M1 adopts a depletion type IXTY01N100D NMOS transistor. The MOS transistor M2 is an enhancement type 2N7002 NMOS transistor. The main control chip U1 adopts related switching power supply PWM IC chips with the model number of UCC2842 and the like.
The utility model discloses high-voltage starting circuit's theory of operation does: the input voltage VIN range of the circuit is 100V-800V, when the grid source voltage GS is 0V through a depletion type NMOS tube M1, the drain electrode DS and the source electrode DS of the M1 are conducted, a capacitor C2 is charged through a current limiting resistor R5, and when the voltage of the capacitor C2 is higher than the starting voltage of a main control chip U1 VDD, the main control chip U1 normally works. After the main control chip works normally, when the gate-source voltage GS voltage of the M2 is greater than the threshold voltage, the drain and the source DS of the M2 are turned on, one end of the resistor R1 is connected with the GND terminal, the auxiliary winding power supply port VAUX generates a fixed voltage to supply power to the U1 VDD, and when the gate-source voltage GS voltage of the M1 is less than the threshold voltage, the M1 is turned off, so that the power consumption of the system is reduced.
The utility model discloses a "VIN" and "VAUX" are the direct current input port and the auxiliary winding power supply input port of this circuit respectively. "GND" is the common reference ground for the dc input and the auxiliary winding supply.
Claims (1)
1. A novel high-voltage starting circuit is characterized in that: the high-voltage power supply comprises a depletion type MOS tube, an enhancement type NMOS tube, a voltage stabilizing tube D1 and a main control chip PWM, wherein a drain electrode D of the depletion type NMOS tube M1 is connected with one end of a capacitor C1 and an input end VIN, a source electrode S is connected with one end of a resistor R5, and a grid electrode G is connected with one ends of a resistor R1 and a resistor R4; the other end of the resistor R1 is connected with the drain D of the enhanced NMOS tube, and the grid G of the enhanced NMOS tube is connected with the resistor R2 and the resistor R3; the other end of the resistor R2 is connected with the PWM input end of the main control chip, the other ends of the resistor R4 and the resistor R5 are connected with the PWM output end of the main control chip and the auxiliary winding power supply port VAUX, and the PWM output end of the main control chip is connected with the GND end of the common ground wire through a voltage-regulator tube D1 and an energy-storage capacitor C2; the capacitor C1, the other end of the resistor R3, the source electrode S end of the enhanced NMOS tube and the GND end of the main control chip PWM are connected with a common ground wire GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022376993.6U CN213342004U (en) | 2020-10-23 | 2020-10-23 | Novel high-voltage starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022376993.6U CN213342004U (en) | 2020-10-23 | 2020-10-23 | Novel high-voltage starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213342004U true CN213342004U (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022376993.6U Active CN213342004U (en) | 2020-10-23 | 2020-10-23 | Novel high-voltage starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213342004U (en) |
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2020
- 2020-10-23 CN CN202022376993.6U patent/CN213342004U/en active Active
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