CN215268059U - Miniaturized switching on and shutting down and surge current protection circuit - Google Patents
Miniaturized switching on and shutting down and surge current protection circuit Download PDFInfo
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- CN215268059U CN215268059U CN202121452021.9U CN202121452021U CN215268059U CN 215268059 U CN215268059 U CN 215268059U CN 202121452021 U CN202121452021 U CN 202121452021U CN 215268059 U CN215268059 U CN 215268059U
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Abstract
The utility model relates to a miniaturized startup and shutdown and surge current protection circuit, which comprises a drive delay circuit, a capacitance filter circuit, an electrifying control circuit and an execution circuit; the driving delay circuit comprises a driving power supply circuit and a delay circuit, the driving power supply circuit provides voltage for the rear-stage circuit, and the delay circuit provides delay for the execution circuit; the capacitor filter circuit is connected with the drive delay circuit and the execution circuit; the power-on control circuit is respectively connected with the driving power supply circuit and the delay circuit and controls the on-off between the driving power supply circuit and the delay circuit; the execution circuit comprises a switching on/off circuit and a surge protection circuit, when the power-on control circuit is switched on, the switching on/off circuit is switched on immediately, the surge protection circuit is switched on in a delayed mode, and a capacitor of the capacitor filter circuit is charged. The power supply circuit has the advantages of simple and efficient circuit structure, few peripheral devices, capability of realizing miniaturization and suitability for power supply system requirements of aircrafts.
Description
Technical Field
The utility model relates to a power protection field especially relates to a miniaturized switching on and shutting down and surge current protection circuit.
Background
In recent years, the functional requirements of aircrafts are more and more powerful, the task requirements are more and more complex, the number and the types of carried electric equipment are more and more, the weight and the volume of a power supply system are more and more large, and the limit of an aircraft platform is more and more rigorous to the volume and the weight of an internal module of the power supply system. In an aircraft power system, each power module requires a switch to be designed, and power on and power off of a power supply are controlled; meanwhile, an input large capacitor is required to be arranged at the input end of the power supply to finish filtering and energy storage, and due to the large capacitor, a large input surge current can be generated during power-up, and a surge current suppression circuit is required to be designed to ensure the stable rise of the capacitor voltage; the system controls the power-on and power-off of the power supply, and needs to be isolated from the input voltage of the power supply, so that a self circuit is ensured not to be interfered.
SUMMERY OF THE UTILITY MODEL
For solving current technical problem, the utility model provides a miniaturized switching on and shutting down and surge current protection circuit.
The specific contents of the utility model are as follows: a miniaturized startup and shutdown and surge current protection circuit comprises a drive delay circuit, a capacitor filter circuit, a power-on control circuit and an execution circuit; the driving delay circuit comprises a driving power supply circuit and a delay circuit, the driving power supply circuit provides voltage for the rear-stage circuit, and the delay circuit provides delay for the execution circuit; the capacitor filter circuit is connected with the drive delay circuit and the execution circuit; the power-on control circuit is respectively connected with the driving power supply circuit and the delay circuit and controls the on-off between the driving power supply circuit and the delay circuit; the execution circuit comprises a switching on/off circuit and a surge protection circuit, when the power-on control circuit is switched on, the switching on/off circuit is switched on immediately, the surge protection circuit is switched on in a delayed mode, and a capacitor of the capacitor filter circuit is charged.
Furthermore, the driving power supply circuit comprises a resistor R1, a resistor R2 and a voltage regulator tube V1, one end of the resistor R1 is connected with the positive end Vin + of the input bus, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the cathode of the voltage regulator tube V1, the anode of the voltage regulator tube V1 is connected with the negative end Vin + of the input bus, and the cathode of the voltage regulator tube V1 is also connected with an electric control circuit.
Furthermore, the time delay circuit comprises a resistor R3, a resistor R4, a capacitor C1 and a diode V2, two ends of the capacitor C1 are connected with the surge protection circuit, one end of the resistor R3 is connected with an E pole of the optocoupler V5 and one end of the resistor R4, the other end of the resistor R4 is connected with a negative terminal Vin of the input bus, the other end of the resistor R4 is connected with the surge protection circuit, the diode V2 is connected with the resistor R4 in parallel, and the anode of the diode V2 is connected with the surge protection circuit.
Further, the power-on control circuit comprises an optical coupler V5, the input end of the optical coupler V5 is controlled by a control level, and the output end of the optical coupler V5 is respectively connected between the driving power supply circuit and the delay circuit.
Further, the power-on control circuit further comprises a resistor R7, a resistor R8, a voltage regulator tube V6 and an MOS tube V7, wherein a control level is input through CON + and CON-, one end of the resistor R7 is connected with a positive control level input terminal CON +, the other end of the resistor R7 is connected with an A pole of the optocoupler V5, a cathode of the voltage regulator tube V6 is connected with the positive control level input terminal CON +, an anode of the voltage regulator tube V6 is connected with a resistor R8 and a G pole of the MOS tube V7, the other end of the resistor R8 and an S pole of the MOS tube V7 are connected with a negative control level input terminal CON-, and a K pole of the optocoupler V5 is connected with a D pole of the voltage regulator tube V6.
Further, the power on/off circuit comprises an MOS tube V3, the S pole of the MOS tube V3 is connected with the negative terminal Vin-of the input bus, and the D pole of the MOS tube V3 is connected with the surge protection circuit.
Furthermore, the surge protection circuit comprises an MOS transistor V4 and a surge-proof resistor R5, the D pole of the MOS transistor V3 is connected with the S pole of the MOS transistor V4, one end of the surge-proof resistor R5 is connected with the D pole of the V4, the other end of the surge-proof resistor R5 is connected with the S pole of the V4, and the D pole of the V4 is connected with the negative end Vout-of the output.
Furthermore, the capacitor filter circuit comprises a capacitor C2 and a resistor R6, wherein the positive electrode of the capacitor C2 is connected with the positive end Vin + of the input bus and the positive end Vout + of the output, the negative electrode of the capacitor C2 is connected with the negative end Vout-, the negative end Vout-of the output is connected with the D electrode of the MOS tube V4, and the resistor R6 is connected in parallel at two ends of the capacitor C2.
Further, the delay time of the delay circuit is longer than the charging time of the capacitor C2.
After the power-on control circuit inputs a control level, the driving power supply circuit supplies power for the drive of the post-stage circuit, and due to the arrangement of the delay circuit, the startup and shutdown circuit is immediately turned on, the surge protection circuit is turned on in a delayed mode, the capacitor filter circuit is charged, and surge current is suppressed. The circuit structure is succinct high-efficient, and peripheral device is few, can accomplish the miniaturization, is applicable to the electrical power generating system requirement of aircraft.
Drawings
The following further explains the embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic diagram of a miniaturized switching on/off and surge current protection circuit of the present invention.
Detailed Description
With reference to fig. 1, the present embodiment discloses a miniaturized power on/off and surge current protection circuit, which includes a driving delay circuit, a capacitor filter circuit, a power-on control circuit, and an execution circuit. The driving delay circuit comprises a driving power supply circuit and a delay circuit, wherein the driving power supply circuit provides voltage for a post-stage circuit, and the delay circuit provides delay for the execution circuit; the capacitor filter circuit is connected with the drive delay circuit, the execution circuit and the output end; the power-on control circuit is respectively connected with the driving power supply circuit and the delay circuit to control the on-off of the driving power supply circuit and the delay circuit; the execution circuit comprises a switching on/off circuit and a surge protection circuit, when the power-on control circuit is switched on, the switching on/off circuit is switched on immediately, the surge protection circuit is switched on in a delayed mode, and a capacitor of the capacitor filter circuit is charged.
The driving delay circuit comprises resistors R1-R4, a voltage regulator tube V1, a diode V2 and a capacitor C1. The capacitor filter circuit comprises a capacitor C2 and a resistor R6. The power-on control circuit comprises resistors R7-R8, a voltage regulator tube V6, an MOS tube V7 and an optical coupler V5. The executive circuit comprises MOS transistors V3 and V4 and an anti-surge resistor R5.
The structure of the drive power supply circuit of the drive delay circuit is as follows: one end of the resistor R1 is connected with the positive end Vin + of the input bus, the other end is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the cathode of the voltage-regulator tube V1, and the anode of the voltage-regulator tube V1 is connected with the negative end Vin-of the input bus.
The resistors R1 and R2 and the voltage regulator tube V1 divide the bus voltage to generate an auxiliary voltage to provide voltage for the driving of the rear stage MOS tube, the resistors R1 and R2 are high resistance resistors generally, and the voltage regulator tube V1 is a low voltage regulator tube generally. In this embodiment, the input bus voltage is 270V, the resistors R1 and R2 are 50k Ω, and the voltage regulator tube V1 is 15V.
The delay circuit of the driving delay circuit comprises a resistor R3, a resistor R4, a diode V2 and a capacitor C1. One end of the capacitor C1 is connected with the G pole of the MOS tube V4, the other end is connected with the S pole of the MOS tube V4, one end of the resistor R3 is connected with the E pole of the optical coupling V5 and one end of the resistor R4, the other end is connected with the negative terminal Vin-of the input bus, the other end of the resistor R4 is connected with the G pole of the MOS tube V4, the diode V2 is connected with the resistor R4 in parallel, and the anode of the diode V2 is connected with the G pole of the MOS tube V4.
The delay time of the delay circuit is R4 × C1, and after the power-off, the voltage on the capacitor C1 is rapidly discharged through the diode V2 and the resistor R3. The diode V2 and the resistor R3 form a fast discharging circuit, which quickly discharges the charge on C1 when the device is turned off. In this embodiment, the resistor R3 is 10k Ω, the resistor R4 is 100k Ω, and the capacitor C1 is 0.1 uF.
The power-on control level of the power-on control circuit is input through CON + and CON-, one end of a resistor R7 is connected with a control level input positive terminal CON +, the other end of a resistor R7 is connected with the A pole (i.e. the input end-the light-emitting tube end) of an optocoupler V5, the cathode of a voltage regulator tube V6 is connected with the control level input positive terminal CON +, the anode of the voltage regulator tube V6 is connected with a resistor R8 and the G pole of an MOS tube V7, the other end of the resistor R8 and the S pole of the MOS tube V7 are connected with the control level input negative terminal CON-, and the K pole (the light-emitting tube end) of the optocoupler V5 is connected with the D pole of the V6.
When the control level voltage is larger than the value of the voltage regulator tube V6, the voltage is applied to the control MOS tube V7, the MOS tube V7 is conducted, the optical coupler V5 is conducted, and the delay circuit is driven to work. In this embodiment, the control level is a 28V power supply line (aircraft platform control power supply), the voltage regulator tube V6 is 12V, the resistances of the resistors R7 and R8 are 5.1k Ω, the MOS transistor V7 is 2N7002, and the optocoupler V5 is TLP 291.
The switching-on and switching-off circuit of the executive circuit comprises a MOS transistor V3, and the surge protection circuit comprises a MOS transistor V4 and an anti-surge resistor R5. The S pole of the MOS tube V3 is connected with the negative end Vin-of the input bus, the D pole of the MOS tube V3 is connected with the S pole of the MOS tube V4, one end of the anti-surge resistor R5 is connected with the D pole of the V4, the other end of the anti-surge resistor R5 is connected with the S pole of the MOS tube V4, and the D pole of the V4 is connected with Vout-.
After a starting signal is added, the optical coupler V5 is switched on, the MOS transistor V3 is started immediately, the MOS transistor V4 is switched on in a delayed mode, the capacitor C2 is charged by circuit current through the resistor R5 in the delayed period, and the delayed time is longer than the charging time of the capacitor C2, so that the capacitor C2 is charged in the delayed time, and starting surge current is restrained. In this embodiment, STP57M65M5(600V42A) is selected for MOS transistors V3 and V4, and resistor R5 is 30 Ω.
The capacitor C2 in the capacitor filter circuit is an input filter capacitor, the positive terminal Vin + of the input bus of the positive pole of the capacitor C2 is connected with the positive terminal Vout + of the output, the negative pole of the capacitor C2 is connected with the negative terminal Vout-of the output, Vout-is connected with the D pole of the MOS tube V4, and R6 is connected in parallel with the two ends of the capacitor C2.
The capacitor C2 is a high-voltage large-capacity aluminum electrolytic capacitor, which can smooth the input voltage fluctuation and absorb the pulse current of the inverter circuit at the later stage, the resistor R6 is a discharge resistor which is a high-resistance resistor, and the stored energy in the capacitor C2 is discharged through the resistor after the power supply is shut down. In this embodiment, the capacitor C2 is 40uF, and the resistor R6 is 220k Ω.
The miniaturized switching on and shutting down and surge current protection circuit of this embodiment, each device remove filter capacitor C2 all the other table of being and paste the device, and is small, efficient, has reached the utility model discloses the required switching on and shutting down and surge protect function that realize. The functions of immediate switching-on of the on-off MOS tube V3 and delayed switching-on of the surge protection MOS tube V4 are completed through the driving delay circuit, the circuit is simple and efficient, the number of peripheral devices is small, the size is mainly determined by the size of the MOS tube, the small surface-mounted MOS tube can be selected corresponding to medium and small power, and the size of the functional circuit is controllable to be small. The diode V2 and the resistor R3 form a quick discharge loop, after the control level is powered down, the optical coupler is not conducted, the charge on the C1 is quickly released, and preparation is made for next starting, so that frequent switching of the power supply can be realized. The power-on control circuit adopts optical coupler isolation, and the switching-on of the optical coupler V5 is accelerated through the voltage regulator tube V6 and the control MOS tube V7, so that the MOS tube damage caused by the slow rise of the driving voltage of the switch MOS tube due to the fact that the MOS tube works in the variable resistance area for a long time is prevented. The loss is low, and the heat productivity is small; the common devices are adopted, the circuit only adopts the conventional resistor, capacitor, diode, MOS tube and voltage regulator tube, the equipment is universal and the source is wide; the circuit parameters are convenient to adjust, and the cost is low.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a miniaturized switching on and shutting down and surge current protection circuit which characterized in that: the circuit comprises a driving delay circuit, a capacitance filter circuit, a power-on control circuit and an execution circuit; the driving delay circuit comprises a driving power supply circuit and a delay circuit, the driving power supply circuit provides voltage for the rear-stage circuit, and the delay circuit provides delay for the execution circuit; the capacitor filter circuit is connected with the drive delay circuit and the execution circuit; the power-on control circuit is respectively connected with the driving power supply circuit and the delay circuit to control the on-off of the driving power supply circuit and the delay circuit; the execution circuit comprises a switching on/off circuit and a surge protection circuit, when the power-on control circuit is switched on, the switching on/off circuit is switched on immediately, and the surge protection circuit is switched on in a delayed mode.
2. The miniaturized switching and inrush current protection circuit of claim 1, wherein: the driving power supply circuit comprises a resistor R1, a resistor R2 and a voltage regulator tube V1, one end of the resistor R1 is connected with the positive end Vin + of the input bus, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the cathode of the voltage regulator tube V1, the anode of the voltage regulator tube V1 is connected with the negative end Vin + of the input bus, and the cathode of the voltage regulator tube V1 is also connected with an electric control circuit.
3. The miniaturized switching and inrush current protection circuit of claim 1, wherein: the time delay circuit comprises a resistor R3, a resistor R4, a capacitor C1 and a diode V2, wherein the two ends of the capacitor C1 are connected with the surge protection circuit, one end of the resistor R3 is connected with the E pole of the optocoupler V5 and one end of the resistor R4, the other end of the resistor R4 is connected with the negative terminal Vin of the input bus, the other end of the resistor R4 is connected with the surge protection circuit, the diode V2 is connected with the resistor R4 in parallel, and the anode of the diode V2 is connected with the surge protection circuit.
4. The miniaturized switching and inrush current protection circuit of claim 1, wherein: the power-on control circuit comprises an optical coupler V5, the input end of the optical coupler V5 is controlled by a control level, and the output end of the optical coupler V5 is respectively connected between the driving power supply circuit and the delay circuit.
5. The miniaturized switching and inrush current protection circuit of claim 4, wherein: the power-on control circuit further comprises a resistor R7, a resistor R8, a voltage regulator tube V6 and an MOS tube V7, wherein a control level is input through CON + and CON-, one end of the resistor R7 is connected with a positive control level input end CON +, the other end of the resistor R7 is connected with an A pole of the optocoupler V5, a cathode of the voltage regulator tube V6 is connected with the positive control level input end CON +, an anode of the voltage regulator tube V6 is connected with a resistor R8 and a G pole of the MOS tube V7, the other end of the resistor R8 and an S pole of the MOS tube V7 are connected with a negative control level input end CON-, and a K pole of the optocoupler V5 is connected with a D pole of the voltage regulator tube V6.
6. The miniaturized switching and inrush current protection circuit of claim 1, wherein: the power on/off circuit comprises an MOS tube V3, the S pole of the MOS tube V3 is connected with the negative terminal Vin-of the input bus, and the D pole of the MOS tube V3 is connected with the surge protection circuit.
7. The miniaturized switching and inrush current protection circuit of claim 6, wherein: the surge protection circuit comprises an MOS transistor V4 and a surge-proof resistor R5, wherein the D pole of the MOS transistor V3 is connected with the S pole of the MOS transistor V4, one end of the surge-proof resistor R5 is connected with the D pole of the V4, the other end of the surge-proof resistor R5 is connected with the S pole of the V4, and the D pole of the V4 is connected with the negative end Vout-of the output.
8. The miniaturized switching and inrush current protection circuit of claim 7, wherein: the capacitor filter circuit comprises a capacitor C2 and a resistor R6, wherein the positive electrode of the capacitor C2 is connected with the positive end Vin + of an input bus and the positive end Vout + of an output bus, the negative electrode of the capacitor C2 is connected with the negative end Vout-, the negative end Vout-of the output is connected with the D electrode of an MOS tube V4, and the resistor R6 is connected in parallel at two ends of the capacitor C2.
9. The miniaturized switching and inrush current protection circuit of claim 8, wherein: the delay time of the delay circuit is longer than the charging time of the capacitor C2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120902427 | 2021-04-28 | ||
| CN2021209024276 | 2021-04-28 |
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| CN215268059U true CN215268059U (en) | 2021-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115513930A (en) * | 2022-10-27 | 2022-12-23 | 北京瀚海科技有限公司 | Power-on protection circuit for fan |
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2021
- 2021-06-28 CN CN202121452021.9U patent/CN215268059U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115513930A (en) * | 2022-10-27 | 2022-12-23 | 北京瀚海科技有限公司 | Power-on protection circuit for fan |
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