CN213125837U - Power supply preprocessing circuit - Google Patents
Power supply preprocessing circuit Download PDFInfo
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- CN213125837U CN213125837U CN202022123510.1U CN202022123510U CN213125837U CN 213125837 U CN213125837 U CN 213125837U CN 202022123510 U CN202022123510 U CN 202022123510U CN 213125837 U CN213125837 U CN 213125837U
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Abstract
The utility model provides a power supply preprocessing circuit, power supply preprocessing circuit includes: the surge suppression circuit is used for realizing an overvoltage surge amplitude limiting function; a power maintenance circuit electrically connected to the surge suppression circuit, the power maintenance circuit capable of performing a power interruption maintenance function; functional circuit, functional circuit connects on the power maintenance circuit, functional circuit does when the steady state input power maintenance circuit provides the power return circuit, the utility model discloses a three major circuit parts make up organically, realize that the function is integrated, traditional discrete product volume reduces more than 40% compared, and the power return circuit loss reduces by a wide margin simultaneously, and efficiency is effectively promoted.
Description
Technical Field
The utility model relates to a power supply circuit technical field especially relates to a power supply preprocessing circuit.
Background
With the continuous progress and development of airborne electronic equipment, the "electrical pollution" such as overvoltage surge, transient spike surge and the like becomes an important realization problem which seriously affects the use and damage of electrical equipment. In an airborne equipment computer, a power supply module has the main function of realizing power supply conversion and converting last power supply voltage of the computer into various direct current voltages required by the computer. Because the power supply condition of the airplane is complex, a series of problems such as conducted noise, magnetic field radiation interference, overvoltage surge, spike surge and undervoltage surge exist, wherein the main problems of serious faults such as damage of a power module and a power utilization module are the overvoltage surge and the spike surge, and the problems need to be treated by using a power supply preprocessing technology.
The aviation airborne power supply preprocessing technology is the core of airborne power supply processing, mainly comprises parts such as surge suppression and power supply maintenance, and the existing power supply preprocessing technology uses discrete products, has the problems of large volume and low efficiency, and can not meet the requirement of future aviation airborne power supply along with the development of an avionic system towards miniaturization, integration and high efficiency.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a power supply preprocessing circuit.
The utility model discloses a following technical scheme realizes:
the utility model provides a power supply preprocessing circuit, power supply preprocessing circuit includes:
the surge suppression circuit is used for realizing an overvoltage surge amplitude limiting function;
a power maintenance circuit electrically connected to the surge suppression circuit, the power maintenance circuit capable of performing a power interruption maintenance function;
a functional circuit connected to the power maintenance circuit, the functional circuit providing a power loop for the power maintenance circuit when in steady state input.
Further, the surge suppression circuit comprises a Boost circuit Boost1, a Control circuit Control, a resistor R4 and an N-channel MOS tube Q1, wherein the Boost circuit Boost1, the Control circuit Control and the resistor R4 are connected in series, one end of the N-channel MOS tube Q1 is electrically connected with the resistor R4, and the other end of the N-channel MOS tube Q1 is electrically connected with the Control circuit Control.
Further, the surge suppression circuit further comprises a resistor R1 and a voltage regulator tube D1, one end of the resistor R1 is electrically connected with the Boost circuit Boost1, the other end of the resistor R1 is grounded, one end of the voltage regulator tube D1 is electrically connected with the N-channel MOS tube Q1, and the other end of the voltage regulator tube D1 is electrically connected with the resistor R1.
Further, the power supply maintaining circuit comprises a Boost circuit Boost2, a resistor R8 and a capacitor C1, wherein the resistor R8 is a current-limiting resistor, the capacitor C1 is an energy storage capacitor, one end of the Boost circuit Boost2 is electrically connected with the N-channel MOS transistor Q1, the other end of the Boost circuit Boost2 is electrically connected with the resistor R8, and the capacitor C1 is electrically connected with one end of the resistor R8, which is far away from the Boost circuit Boost 2.
Further, the power supply maintaining circuit further includes an operational amplifier circuit AMP, a resistor R6, a resistor R7, a resistor R10, an N-channel MOS transistor Q4, a P-channel MOS transistor Q5, a resistor R9, and a diode D2, where the resistor R6 and the resistor R7 are sampling resistors, one end of the operational amplifier circuit AMP is connected between the resistor R6 and the resistor R7, the other end of the operational amplifier circuit AMP is electrically connected to the N-channel MOS transistor Q4, one end of the resistor R9 is electrically connected to the P-channel MOS transistor Q5, the other end of the resistor R9 is electrically connected to the resistor R10, and the P-channel MOS transistor Q5 is connected in series to the diode D2.
Furthermore, the functional circuit comprises a control chip U1 and an N-channel MOS tube Q3, two ends of the control chip U1 are connected in parallel to the N-channel MOS tube Q3, the one-way conduction function of a traditional diode is achieved, current can only flow from the drain electrode to the source electrode of the N-channel MOS tube Q3, and when the current is reversed, the control chip U1 controls the N-channel MOS tube Q3 to be switched off.
The utility model has the advantages that:
the utility model provides a power supply preprocessing circuit mainly comprises surge suppression circuit, power maintaining circuit and reason function circuit, and surge suppression circuit adopts the design of steady voltage amplitude limiting output principle, through the grid drive voltage of control amplitude limiting pipe, makes amplitude limiting pipe work in different work areas, realizes excessive pressure surge amplitude limiting function; the power supply maintaining circuit part adopts the booster circuit to charge for external energy storage capacitor, and the design control circuit that discharges realizes the maintenance function of discharging, and the function circuit provides steady state power return circuit for the power supply maintaining circuit part, through three major circuit organic combinations, realizes the function integration, compares traditional discrete product volume and reduces, and the power return circuit loss reduces by a wide margin simultaneously, and efficiency is effectively promoted.
Drawings
Fig. 1 is a circuit diagram of the power supply preprocessing circuit of the present invention.
Detailed Description
In order to more clearly and completely explain the technical scheme of the present invention, the present invention is further explained with reference to the attached drawings.
Referring to fig. 1, the present invention is realized by the following technical solutions:
the utility model provides a power supply preprocessing circuit, power supply preprocessing circuit includes:
the surge suppression circuit is used for realizing an overvoltage surge amplitude limiting function;
a power maintenance circuit electrically connected to the surge suppression circuit, the power maintenance circuit capable of performing a power interruption maintenance function;
a functional circuit connected to the power maintenance circuit, the functional circuit providing a power loop for the power maintenance circuit when in steady state input.
Further, the surge suppression circuit comprises a Boost circuit Boost1, a Control circuit Control, a resistor R1, a resistor R4, a voltage regulator tube D1 and an N-channel MOS transistor Q1, the Boost circuit Boost1, the Control circuit Control and the resistor R4 are connected in series, one end of the N-channel MOS transistor Q1 is electrically connected with the resistor R4, the other end of the N-channel MOS transistor Q1 is electrically connected with the Control circuit Control, one end of the resistor R1 is electrically connected with the Boost circuit Boost1, the other end of the resistor R1 is grounded, one end of the voltage regulator tube D1 is electrically connected with the N-channel MOS transistor Q1, and the other end of the voltage regulator tube D1 is electrically connected with the resistor R1.
In this embodiment, the surge suppression circuit portion mainly includes the Boost circuit Boost1, the Control circuit Control, the resistor R1, the resistor R4, the voltage regulator tube D1, and the N-channel MOS tube Q1. The Boost circuit Boost1 and the Control circuit Control are conventional circuits. The boosting circuit Boost1 supplies power to the Control circuit Control, and drives the high end of the N-channel MOS tube Q1; the resistor R1 is a floating ground resistor of the Boost circuit Boost1, when VIN is input with 80V surge, redundant voltage is applied to two ends of the resistor R1, and the Boost circuit Boost1 is protected from overvoltage damage; the N-channel MOS tube Q1 is an amplitude limiting tube and provides a main power loop, when an overvoltage surge or a transient spike is input, the Control circuit Control controls the N-channel MOS tube Q1 to work in a saturation region, redundant energy is converted into heat energy to be dissipated, and overvoltage surge suppression is achieved; the resistor R4 and the voltage regulator tube D1 form a voltage regulator circuit, the output voltage value when overvoltage surge occurs is determined, and the output voltage value is obtained by subtracting the turn-off threshold voltage value of the N-channel MOS tube Q1 from the voltage regulator value of the voltage regulator tube D1.
Further, the power maintaining circuit comprises a voltage boosting circuit Boost2, an operational amplifier circuit AMP, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an N-channel MOS tube Q4, a P-channel MOS tube Q5, a capacitor C1 and a diode D2, the resistor R6 and the resistor R7 are sampling resistors, the resistor R8 is a current-limiting resistor, the capacitor C1 is an energy storage capacitor, one end of the Boost circuit Boost2 is electrically connected with the N-channel MOS transistor Q1, the other end of the Boost circuit Boost2 is electrically connected with the resistor R8, one end of the operational amplifier circuit AMP is connected between the resistor R6 and the resistor R7, the other end of the operational amplifier circuit AMP is electrically connected with the N-channel MOS transistor Q4, one end of the resistor R9 is electrically connected with the P-channel MOS transistor Q5, the other end of the resistor R9 is electrically connected with the resistor R10, and the P-channel MOS transistor Q5 is connected with the diode D2 in series.
In this embodiment, the capacitor C1 is a large-capacity energy storage capacitor, and is generally connected externally. The Boost circuit Boost2 is a conventional Boost circuit, the Boost circuit Boost2 boosts the input voltage to a set value to charge the capacitor C1, and the resistor R8 can limit the charging current to prevent a large impact current; the resistor R6 and the resistor R7 sample the output voltage of the surge suppression circuit and then perform error amplification with the operational amplifier circuit AMP, and the operational amplifier circuit AMP controls the switch of the N-channel MOS transistor Q4; the P-channel MOS tube Q5, the resistor R9 and the resistor R10 form a discharge switch circuit and are controlled by the N-channel MOS tube Q4; the diode D2 prevents the VOUT terminal current from flowing backward to the capacitor C1. In a steady state, the operational amplifier circuit AMP outputs a low level, the N-channel MOS transistor Q4 is turned off, the P-channel MOS transistor Q5 remains turned off, and the capacitor C1 does not discharge; when power failure or undervoltage occurs, the operational amplifier circuit AMP outputs high level, the N-channel MOS transistor Q4 is switched on, the P-channel MOS transistor Q5 is driven by itself to be switched on, and the capacitor C1 discharges the VOUT end through the P-channel MOS transistor Q5 and the diode D2, so that the power interruption maintaining function is realized.
Furthermore, the functional circuit comprises a control chip U1 and an N-channel MOS tube Q3, two ends of the control chip U1 are connected in parallel to the N-channel MOS tube Q3, the one-way conduction function of a traditional diode is achieved, current can only flow from the drain electrode to the source electrode of the N-channel MOS tube Q3, and when the current is reversed, the control chip U1 controls the N-channel MOS tube Q3 to be switched off.
In this embodiment, the functional circuit provides a power loop for the power supply maintaining circuit when the functional circuit is in a steady state input state, so as to supply power to the VOUT terminal. The functional circuit mainly comprises the control chip U1 and the N-channel MOS tube Q3, the one-way conduction function of the traditional diode is realized, current can only flow from the drain electrode to the source electrode of the N-channel MOS tube Q3, and the control chip U1 controls the N-channel MOS tube Q3 to be switched off when the current is reversed. Because the on-resistance of the N-channel MOS tube Q3 is extremely low after the N-channel MOS tube Q3 is switched on, the loss and the temperature rise of a power circuit can be greatly reduced, the overall efficiency of the circuit is improved, and the advantages are particularly prominent in large-current occasions.
Of course, the present invention can also have other various embodiments, and based on the embodiments, those skilled in the art can obtain other embodiments without any creative work, and all of them belong to the protection scope of the present invention.
Claims (6)
1. A power supply preconditioning circuit, comprising:
the surge suppression circuit is used for realizing an overvoltage surge amplitude limiting function;
a power maintenance circuit electrically connected to the surge suppression circuit, the power maintenance circuit capable of performing a power interruption maintenance function;
a functional circuit electrically connected to the power maintenance circuit, the functional circuit providing a power loop for the power maintenance circuit when in steady state input.
2. The power supply preprocessing circuit of claim 1, wherein the surge suppression circuit comprises a Boost circuit Boost1, a Control circuit Control, a resistor R4 and an N-channel MOS transistor Q1, the Boost circuit Boost1, the Control circuit Control and the resistor R4 are connected in series, one end of the N-channel MOS transistor Q1 is electrically connected with the resistor R4, and the other end of the N-channel MOS transistor Q1 is electrically connected with the Control circuit Control.
3. The power supply preprocessing circuit of claim 2, wherein the surge suppression circuit further comprises a resistor R1 and a voltage regulator tube D1, one end of the resistor R1 is electrically connected with the Boost circuit Boost1, the other end of the resistor R1 is grounded, one end of the voltage regulator tube D1 is electrically connected with the N-channel MOS tube Q1, and the other end of the voltage regulator tube D1 is electrically connected with the resistor R1.
4. The power supply preprocessing circuit of claim 2, wherein the power supply maintaining circuit comprises a Boost circuit Boost2, a resistor R8 and a capacitor C1, the resistor R8 is a current-limiting resistor, the capacitor C1 is an energy-storage capacitor, one end of the Boost circuit Boost2 is electrically connected to the N-channel MOS transistor Q1, the other end of the Boost circuit Boost2 is electrically connected to the resistor R8, and the capacitor C1 is electrically connected to one end of the resistor R8 far away from the Boost circuit Boost 2.
5. The power supply preprocessing circuit as claimed in claim 4, wherein the power supply maintaining circuit further comprises an operational amplifier circuit AMP, a resistor R6, a resistor R7, a resistor R10, an N-channel MOS transistor Q4, a P-channel MOS transistor Q5, a resistor R9, and a diode D2, wherein the resistors R6 and R7 are sampling resistors, one end of the operational amplifier circuit AMP is connected between the resistor R6 and the resistor R7, the other end of the operational amplifier circuit AMP is electrically connected to the N-channel MOS transistor Q4, one end of the resistor R9 is electrically connected to the P-channel MOS transistor Q5, the other end of the resistor R9 is electrically connected to the resistor R10, and the P-channel MOS transistor Q5 is connected to the diode D2 in series.
6. The power supply preprocessing circuit of claim 1, wherein the functional circuit comprises a control chip U1 and an N-channel MOS transistor Q3, two ends of the control chip U1 are connected in parallel to the N-channel MOS transistor Q3, so as to implement a unidirectional turn-on function of a conventional diode, current can only flow from a drain to a source of the N-channel MOS transistor Q3, and when the current is reversed, the control chip U1 controls the N-channel MOS transistor Q3 to turn off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022123510.1U CN213125837U (en) | 2020-09-23 | 2020-09-23 | Power supply preprocessing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022123510.1U CN213125837U (en) | 2020-09-23 | 2020-09-23 | Power supply preprocessing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213125837U true CN213125837U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022123510.1U Active CN213125837U (en) | 2020-09-23 | 2020-09-23 | Power supply preprocessing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213125837U (en) |
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2020
- 2020-09-23 CN CN202022123510.1U patent/CN213125837U/en active Active
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