CN202513837U - AC-DC voltage stabilizing protection circuit and chip power conversion circuit - Google Patents
AC-DC voltage stabilizing protection circuit and chip power conversion circuit Download PDFInfo
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- CN202513837U CN202513837U CN2012200661072U CN201220066107U CN202513837U CN 202513837 U CN202513837 U CN 202513837U CN 2012200661072 U CN2012200661072 U CN 2012200661072U CN 201220066107 U CN201220066107 U CN 201220066107U CN 202513837 U CN202513837 U CN 202513837U
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Abstract
The utility model is applicable to the field of integrated circuits and provides an AC-DC voltage stabilizing protection circuit and a chip power conversion circuit. The protection circuit comprises an external unit, a voltage stabilizing unit, a voltage detecting unit, a voltage reference unit and an error amplifying unit, wherein the external unit is used for carrying out voltage reduction conversion on a mains supply and outputting a direct-current voltage with certain ripple; the voltage stabilizing unit is used for carrying out voltage stabilization on the direct-current voltage; the voltage detecting unit is used for sampling the direct-current voltage, carrying out partial voltage detection and outputting a detecting signal; the voltage reference unit is used for generating a voltage reference according to the direct-current voltage; and the error amplifying unit is used for carrying out error amplification and controlling a source current of the voltage stabilizing unit through the detecting signal and the reference voltage. The AC-DC voltage stabilizing protection circuit and chip power conversion circuit has the advantages that the mains supply is converted into the direct-current voltage, the detecting signal and the reference voltage are generated, a conducting current of the voltage stabilizing unit is controlled according to a result obtained by error amplification of the detecting signal and the reference voltage, and further the external unit and the voltage stabilizing unit are controlled to reduce and stabilize the voltage. The AC-DC voltage stabilizing protection circuit and chip power conversion circuit also has the advantages of simple structure, small volume, low cost, easiness in implementation, small power ripple and good stabilizing effect.
Description
Technical field
The utility model belongs to integrated circuit fields, relates in particular to a kind of AC-DC protective circuit of voltage regulation and chip power change-over circuit.
Background technology
When integrated circuit is used, often need the 220V alternating current be converted into low-voltage dc voltage and supply chip or chip exterior circuit to use, and existing conversion regime is divided into:
1, adopt the Industrial Frequency Transformer step-down, realize lowering and stabilizing blood pressure through special linear voltage stabilization chip after the rectification, but the cost of Industrial Frequency Transformer that this mode is used and linear voltage stabilization chip is too high, volume is excessive;
2, adopt switching power source chip to realize lowering and stabilizing blood pressure, like the viper chip, but the peripheral circuit of the switching power source chip that this mode is used is complicated, realizes that difficulty is high;
3, the control circuit and the resistance-capacitance coupling rectification circuit of working voltage judge module, overvoltage protective module, switching device and power resistor composition are realized step-down and overvoltage protection; By overvoltage protective module output high-low level control switch device break-make; So that the power consumption of voltage-stabiliser tube is transferred on the external power resistor; Reduce the chip caloric value, but the switching device that this mode is used cause power supply ripple greatly, extremely unstable, be unfavorable for the application of chip.
The utility model content
The purpose of the utility model embodiment is to provide a kind of AC-DC protective circuit of voltage regulation, and cost is high when chip power supply is changed at present, volume is big, the problem that peripheral circuit is complicated, ripple is big to be intended to solution.
The utility model embodiment is achieved in that a kind of AC-DC protective circuit of voltage regulation, and said protective circuit comprises:
Civil power is carried out the step-down conversion, and output has the external unit of the direct voltage of certain ripple, and the positive and negative input of said external unit is electrically connected with outside city, and first output of said external unit is through filter capacitor C10 ground connection;
To the voltage regulation unit that said direct voltage carries out voltage stabilizing, the input of said voltage regulation unit is connected with first output of said external unit;
To the sampling of said direct voltage and carry out dividing potential drop and detect, the voltage detection unit of output detection signal, the input of said voltage detection unit is connected with first output of said external unit;
According to the voltage reference unit of a reference voltage of said direct voltage generation, the input of said voltage reference unit is connected with second output of said external unit;
Carry out the said voltage regulation unit of error amplification control through said detection signal and said reference voltage and draw electric current; To realize the error amplifying unit of voltage stabilizing control; The inverting input of said error amplifying unit is connected with the output of said voltage reference unit; The positive input of said error amplifying unit is connected with the output of said voltage detection unit; The output of said error amplifying unit is connected with the feedback end of said voltage regulation unit, and the power end of said error amplifying unit is connected with second output of said external unit, the earth terminal ground connection of said error amplifying unit.
Further, said external unit comprises:
Resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, capacitor C 3, diode D0, diode D1, diode D2, diode D3;
The anode of said diode D0 is that the positive input terminal of said external unit is connected with the negative electrode of said diode D1; The negative electrode of said diode D0 is connected with the negative electrode of said diode D2; The anode of said diode D2 is connected with the negative electrode of said diode D3; The negative electrode of said diode D3 is connected with an end of said resistance R 1 and said capacitor C 1 simultaneously; The other end of said resistance R 1 is that the negative input end of said external unit is connected with the other end of said capacitor C 1, and the anode of the anode of said diode D1 and said diode D3 is ground connection simultaneously, and an end of said capacitor C 2 is that first output of said external unit is connected with the negative electrode of said diode D0; The other end ground connection of said capacitor C 2; One end of said resistance R 2 is connected with the negative electrode of said diode D0, and the other end of said resistance R 2 is that second output of said external unit is connected the other end ground connection of said capacitor C 3 with the end of the said C3 of electric capacity.
Further, said external unit comprises:
The anode of said diode D4 is that the positive input terminal of said external circuits is connected with the negative electrode of said diode D5; The negative electrode of said diode D4 is connected with the negative electrode of said diode D6; The anode of said diode D6 is that the negative input end of said external unit is connected with the negative electrode of said diode D7; The anode of the anode of said diode D7 and said diode D5 is ground connection simultaneously, and an end of said capacitor C 4 is connected with the negative electrode of said diode D4, the other end ground connection of said capacitor C 4; One end of said resistance R 3 is connected with the negative electrode of said diode D4 simultaneously; The other end of said resistance R 3 is that first output of said external unit is connected with the control end of the said first high-voltage power pipe, and the input of the said first high-voltage power pipe is connected with an end of said resistance R 3, and the output of the said first high-voltage power pipe is connected with an end of said capacitor C 5; The other end ground connection of said capacitor C 5; One end of said resistance R 4 is connected with the output of the said first high-voltage power pipe simultaneously, and the other end of said resistance R 4 is that second output of said external unit is connected the other end ground connection of said capacitor C 6 with an end of said capacitor C 6.
Further; The said first high-voltage power pipe is a NPN type high-voltage power triode; The control end of the said first high-voltage power pipe is the base stage of said NPN type high-voltage power triode; The input of the said first high-voltage power pipe is the collector electrode of said NPN type high-voltage power triode, and the output of the said first high-voltage power pipe is the emitter of said NPN type high-voltage power triode.
Further, said voltage regulation unit comprises:
Compensating module and second switch pipe pipe Q2;
The input of said second switch pipe is the input of said voltage regulation unit; The control end of said second switch pipe is that the feedback end of said voltage regulation unit is connected with the input of said compensating module, and the output of said second switch pipe and the output of said compensating module be ground connection simultaneously.
Further; Said second switch pipe is a N type metal-oxide-semiconductor; The control end of said second switch pipe is the grid of said N type metal-oxide-semiconductor, and the input of said second switch pipe is the drain electrode of said N type metal-oxide-semiconductor, and the output of said second switch pipe is the source class of said N type metal-oxide-semiconductor.
Further, said voltage detection unit comprises:
Resistance R 5 and resistance R 6;
Said voltage detection unit input is connected with the voltage regulation unit input; One end of said resistance R 5 is the input of said voltage detection unit; The other end of said resistance R 5 is that the output of said voltage detection unit is connected the other end ground connection of said resistance R 6 with an end of said resistance R 6.
Further, said voltage reference unit comprises:
Start module, band-gap reference module, the 3rd switching tube, capacitor C 7;
The input of the input of said startup module and said band-gap reference module is the input of said voltage reference unit simultaneously; The output of said startup module is connected with the control end of said band-gap reference module; The output of said band-gap reference module is connected with said the 3rd output end of switching tube; Said the 3rd control end of switching tube is connected with the input of said band-gap reference module, and the input of said the 3rd switching tube is that the output of said voltage reference unit is through said capacitor C 7 ground connection.
Further; Said the 3rd switching tube is a N type metal-oxide-semiconductor; Said the 3rd control end of switching tube is the grid of said N type metal-oxide-semiconductor, and the input of said the 3rd switching tube is the drain electrode of said N type metal-oxide-semiconductor, and said the 3rd output end of switching tube is the source electrode of said N type metal-oxide-semiconductor.
Another purpose of the utility model embodiment is to provide a kind of chip power change-over circuit that adopts above-mentioned protective circuit.
In the utility model embodiment; Through voltage detection unit sampled voltage input; Sampled voltage that obtains and voltage reference carry out error and amplify, thereby the grid voltage of the output of error amplification module control voltage-stabiliser tube is controlled its conducting electric current, and the conducting electric current is realized lowering and stabilizing blood pressure through resistance-capacitance coupling or high-voltage power pipe circuit; Size through control conducting electric current is controlled pressure drop, and stable voltage and protective circuit can be provided simply and effectively.
Description of drawings
The structure chart of the AC-DC protective circuit of voltage regulation that Fig. 1 provides for the utility model one embodiment;
The first exemplary circuit structure chart of the AC-DC protective circuit of voltage regulation China and foreign countries order unit that Fig. 2 provides for the utility model one embodiment;
The second exemplary circuit structure chart of the AC-DC protective circuit of voltage regulation China and foreign countries order unit that Fig. 3 provides for the utility model one embodiment;
The exemplary circuit structure chart of voltage regulation unit and voltage detection unit in the AC-DC protective circuit of voltage regulation that Fig. 4 provides for the utility model one embodiment;
The exemplary circuit structure chart of voltage reference unit in the AC-DC protective circuit of voltage regulation that Fig. 5 provides for the utility model one embodiment.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model embodiment is through voltage detection unit sampled voltage input; Sampled voltage that obtains and voltage reference carry out error and amplify; Thereby the grid voltage of the output of error amplification module control voltage-stabiliser tube is controlled its conducting electric current; The conducting electric current is realized lowering and stabilizing blood pressure simply and effectively through resistance-capacitance coupling or high-voltage power pipe circuit, controls pressure drop through the size of control conducting electric current.
Fig. 1 illustrates the structure of the AC-DC protective circuit of voltage regulation that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model.
The AC-DC protective circuit of voltage regulation 1 that provides as the utility model one embodiment can be applied to various chip power change-over circuits, and this AC-DC protective circuit of voltage regulation 1 comprises:
Civil power is carried out the step-down conversion, and output has the external unit 11 of the direct voltage of certain ripple, and the positive and negative input of this external unit 11 is electrically connected with outside city, and first output of external unit 11 is through filter capacitor C10 ground connection;
To the voltage regulation unit 12 that direct voltage carries out voltage stabilizing, the input of this voltage regulation unit 12 is connected with first output of external unit 11;
To direct voltage sampling and carry out dividing potential drop and detect, the voltage detection unit 13 of output detection signal, the input of this voltage detection unit 13 is connected with first output of external unit 11;
According to the voltage reference unit 14 of a reference voltage of direct voltage generation, the input of this voltage reference unit 14 is connected with second output of external unit 11;
Carry out the said voltage regulation unit of error amplification control through said detection signal and said reference voltage and draw electric current; To realize the error amplifying unit 15 of voltage stabilizing control; The inverting input of this error amplifying unit 15 is connected with the output of voltage reference unit 14; The positive input of error amplifying unit 15 is connected with the output of voltage detection unit 13; The output of error amplifying unit 15 is connected with the feedback end of voltage regulation unit 12, and the power end of error amplifying unit 15 is connected with second output of external unit 11, the earth terminal ground connection of error amplifying unit 15.
As the utility model one embodiment; Voltage regulation unit 12, voltage detection unit 13, voltage reference unit 14 and error amplifying unit 15 can be integrated in the chip; And external unit 11 can place the application circuit outside the chip 3; Second output of external unit 11 is connected with the voltage input pin of chip, converts line voltage the operating voltage of chip into through this AC-DC protective circuit of voltage regulation 1, is operating circuit 2 power supplies of chip internal.
Voltage detection unit is with the sampled voltage input; Sampled voltage that obtains and voltage reference carry out error and amplify; Thereby the grid voltage of the output of error amplification module control voltage-stabiliser tube is controlled it; The conducting electric current is realized lowering and stabilizing blood pressure through resistance-capacitance coupling or high-voltage power pipe circuit, controls pressure drop through the size of control conducting electric current, and stable voltage and protective circuit can be provided simply and effectively.
In the utility model embodiment; Civil power is converted into direct voltage and generates detection signal and reference voltage, carry out the conducting electric current of error result amplified control voltage regulation unit, and then control external unit and voltage regulation unit carries out step-down, voltage stabilizing according to detection signal and reference voltage; For chip is supplied power; This circuit structure is simple, volume is little, cost is low, and power supply ripple is little when being easy to realize, stablizing effect is good.
Be elaborated below in conjunction with the realization of specific embodiment to the utility model.
Fig. 2 illustrates the first first exemplary circuit structure of AC-DC protective circuit of voltage regulation China and foreign countries' order that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model.
As the utility model one embodiment, external unit 11 can be realized with the buck configuration of resaistance-capacity coupling circuit, specifically comprised:
Resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, capacitor C 3, diode D0, diode D1, diode D2, diode D3;
The anode of diode D0 is that the positive input terminal of external unit 11 is connected with the negative electrode of diode D1; The negative electrode of diode D0 is connected with the negative electrode of diode D2; The anode of diode D2 is connected with the negative electrode of diode D3, and the negative electrode of diode D3 is connected with an end of resistance R 1 and capacitor C 1 simultaneously, and the other end of resistance R 1 is that the negative input end of external unit 11 is connected with the other end of capacitor C 1; The anode of the anode of diode D1 and diode D3 is ground connection simultaneously; One end of capacitor C 2 is that first output of external unit 11 is connected with the negative electrode of diode D0, the other end ground connection of capacitor C 2, and an end of resistance R 2 is connected with the negative electrode of diode D0; The other end of resistance R 2 is that second output of external unit 11 is connected the other end ground connection of capacitor C 3 with an end of capacitor C 3.
In the utility model embodiment, diode D0, D1, D2, D3 constitute rectifier circuit, and civil power is carried out rectification, and carry out exporting the direct voltage with certain ripple after the filtering through capacitor C 2.Resistance R 1 and capacitor C 1 parallel connection are serially connected in rectifier circuit and the AC network.When circuit works on power; Have electric current to flow to capacitor C 2 through rectifier circuit, the voltage on the capacitor C 2 rises, and other operating circuit when rising to certain voltage value in the chip is started working; When the voltage on the capacitor C 2 surpasses the voltage stabilizing value; AC-DC protective circuit of voltage regulation 1 begins to get into the overvoltage protection state, begins to draw electric current to arrive ground through voltage regulation unit 12, and the total current of drawing electric current to constitute by chip operation electric current and voltage regulation unit 12 all flows through R1, the parallelly connected circuit of C1; Electric current produces pressure drop on the parallel circuits of R1, C1, the pressure drop of flowing through the big generation of electric current is also big.Draw the size of electric current to control the size of pressure drop on the parallel circuits of R1, C1 through control voltage regulation unit 12, thereby realize voltage stabilizing.Rationally select for use the appearance value size of capacitor C 1 can reduce voltage regulation unit 12 power consumptions, improve circuit efficiency.Resistance R 2 is connected with the Vdd power end of the operating circuit of chip with the common port of capacitor C 3; Voltage stabilizing circuit in the chip operation circuit; Can once more the direct voltage Vdd (24V) with certain ripple be reduced to once more the chip operation supply voltage of 5V; Resistance R 2 is dropping resistors, and capacitor C 3 is filter capacitors.
As the utility model one preferred embodiment, external unit 11 can also be realized with high-voltage power pipe circuit, referring to Fig. 3, specifically comprise:
The anode of diode D4 is that the positive input terminal of external circuits is connected with the negative electrode of diode D5; The negative electrode of diode D4 is connected with the negative electrode of diode D6, and the anode of diode D6 is that the negative input end of external unit 11 is connected with the negative electrode of diode D7, and the anode of the anode of diode D7 and diode D5 is ground connection simultaneously; One end of capacitor C 4 is connected with the negative electrode of diode D4; The other end ground connection of capacitor C 4, an end of resistance R 3 is connected with the negative electrode of diode D4 simultaneously, and the other end of resistance R 3 is that first output of external unit 11 is connected with the control end of the first high-voltage power pipe Q1; The input of the first high-voltage power pipe Q1 is connected with an end of resistance R 3; The output of the first high-voltage power pipe Q1 is connected with an end of capacitor C 5, the other end ground connection of capacitor C 5, and an end of resistance R 4 is connected with the output of the first high-voltage power pipe Q1 simultaneously; The other end of resistance R 4 is that second output of external unit 11 is connected the other end ground connection of capacitor C 6 with an end of capacitor C 6.
As the utility model one embodiment; This first high-voltage power pipe Q1 can be NPN type high-voltage power triode; The control end of the first high-voltage power pipe Q1 is the base stage of NPN type high-voltage power triode; The input of the first high-voltage power pipe Q1 is the collector electrode of NPN type high-voltage power triode, and the output of the first high-voltage power pipe Q1 is the emitter of NPN type high-voltage power triode.
This first high-voltage power pipe Q1 also can be N type high-voltage power metal-oxide-semiconductor; The control end of the first high-voltage power pipe Q1 is the grid of N type high-voltage power metal-oxide-semiconductor; The input of the first high-voltage power pipe Q1 is the drain electrode of N type high-voltage power metal-oxide-semiconductor, and the output of the first high-voltage power pipe Q1 is the source electrode of N type high-voltage power metal-oxide-semiconductor.
In the utility model embodiment, diode D4 to diode D7 to the commercial power rectification after through capacitor C 4 filtering, when voltage vcc raises; Conducting electric current in the voltage regulation unit 12 increases, and it is constant basically to flow through the electric current of resistance R 3, and the electric current that therefore flows to the first high-voltage power pipe Q1 base stage reduces; Corresponding the reducing of emitter current of the first high-voltage power pipe Q1; The also corresponding decline of the first high-voltage power pipe Q1 emitter voltage, high-voltage power pipe Q1 base voltage also can and then descend, and realizes the function of lowering and stabilizing blood pressure and overvoltage protection; Resistance R 4 is dropping resistors, and capacitor C 5, capacitor C 6 are filter capacitors.And because voltage regulation unit 12 controls is the base current of high-voltage power pipe Q1, so it is less to flow through the electric current of voltage regulation unit 12, the power that voltage regulation unit 12 consumes is also less, and heat radiation is little.
In the utility model embodiment; The circuit structure that employing has the high-voltage power pipe replaces resaistance-capacity coupling circuit to realize lowering and stabilizing blood pressure; When the average current that can avoid flowing through at voltage regulation unit 12 was big, voltage regulation unit 12 power consumptions were excessive, and too high causing of the heat of generation damages.
Fig. 4 illustrates the exemplary circuit structure of voltage regulation unit and voltage detection unit in the AC-DC protective circuit of voltage regulation that the utility model embodiment provides, and for the ease of explanation, only shows the part relevant with the utility model.
Compensating module 121 and second switch pipe Q2;
Second switch pipe Q2 is as voltage-stabiliser tube; This second switch pipe Q2 input is the input of voltage regulation unit 12; The control end of second switch pipe Q2 is that the feedback end of voltage regulation unit 12 is connected with the input of compensating module 121, and the output of second switch pipe Q2 and the output of compensating module 121 be ground connection simultaneously.
As the utility model one embodiment; Second switch pipe Q2 can be N type metal-oxide-semiconductor; The control end of second switch pipe Q2 is the grid of N type metal-oxide-semiconductor, and the input of second switch pipe Q2 is the drain electrode of N type metal-oxide-semiconductor, and the output of second switch pipe Q2 is the source class of N type metal-oxide-semiconductor.
Second switch pipe Q2 also can be NPN type triode, and the control end of second switch pipe Q2 is the base stage of NPN type triode, and the input of second switch pipe Q2 is the collector electrode of NPN type triode, and the output of second switch pipe Q2 is the emitter of NPN type triode.
In the utility model embodiment, the conducting electric current of the grid voltage control drain-to-source through second switch pipe Q2, just voltage vcc is to the size of current on ground.
Resistance R 5 and resistance R 6;
One end of resistance R 5 is the input of voltage detection unit 13, and the other end of resistance R 5 is that the output of voltage detection unit 13 is connected the other end ground connection of resistance R 6 with an end of resistance R 6.
In the utility model embodiment, voltage detection unit 13 comprises that two resistance of series connection carry out dividing potential drop to input voltage and detect, the height of the size reflection input voltage of pressure-dividing output voltage.The dividing potential drop of resistance R 5, resistance R 6 output uprises when voltage vcc is too high, carries out after error amplifies with reference voltage, and error amplifying circuit output raises; Just voltage-stabiliser tube Q2 grid voltage increases; The conducting electric current also increases, through the electric current increase of parallel resistance R1 and capacitor C 1, so parallel resistance R1 and capacitor C 1 two ends pressure drop increase; Input voltage reduces, and realizes the function of lowering and stabilizing blood pressure and overvoltage protection.Compensating circuit plays the effect of phase compensation.
In conjunction with Fig. 1 and Fig. 5, voltage reference unit 14 comprises:
Start module U1, band-gap reference module U2, the 3rd switching tube Q3, capacitor C 7;
Starting the input of module U1 and the input of band-gap reference module U2 is the input of voltage reference unit 14 simultaneously; The output that starts module U1 is connected with the control end of band-gap reference module U2; The output of band-gap reference module U2 is connected with the output of the 3rd switching tube Q3; The control end of the 3rd switching tube Q3 is connected with the input of band-gap reference module U2, and the input of the 3rd switching tube Q3 is that the output of voltage reference unit 14 passes through capacitor C 7 ground connection.
As the utility model one embodiment; The 3rd switching tube Q3 can be N type metal-oxide-semiconductor; The control end of the 3rd switching tube Q3 is the grid of N type metal-oxide-semiconductor, and the input of the 3rd switching tube Q3 is the drain electrode of N type metal-oxide-semiconductor, and the output of the 3rd switching tube Q3 is the source electrode of N type metal-oxide-semiconductor.
The 3rd switching tube Q3 also can be NPN type triode, and the control end of the 3rd switching tube Q3 is the base stage of N type metal-oxide-semiconductor, and the input of the 3rd switching tube Q3 is the collector electrode of N type metal-oxide-semiconductor, and the output of the 3rd switching tube Q3 is the emitter of N type metal-oxide-semiconductor.
In the utility model embodiment, voltage reference unit 14 provides a stable temperature and the little reference voltage of mains voltage variations influence.Comprise starting circuit U1, band-gap reference circuit U2, the 3rd switching tube Q3 and electric capacity of voltage regulation C7.The grid of the NMOS of breadth length ratio pipe connects supply voltage Vdd; Drain electrode connects capacitor C 7 to ground, and the output reference voltage that drains is simultaneously delivered to another input of error amplifying unit 15, and benchmark can also remain unchanged when Vdd descended like this; And the sampled voltage of voltage detection module 13 descends with supply voltage; Can effectively voltage-stabiliser tube be closed through error amplifying unit 15, make when supply voltage reduces, to make voltage-stabiliser tube stop to draw electric current, because voltage-stabiliser tube conducting electric current is reduced to zero to supply voltage; Input voltage can improve under the effect of resistance-capacitance coupling or high-voltage power pipe circuit, lets chip descend or also can operate as normal during power down suddenly at power input voltage.
In the utility model embodiment; Through voltage detection unit 13 sampled voltage inputs; Sampled voltage that obtains and voltage reference carry out error and amplify, thereby the grid voltage of the output of error amplifying unit 15 control voltage-stabiliser tube is controlled its conducting electric current, and the conducting electric current is realized lowering and stabilizing blood pressure through resistance-capacitance coupling or high-voltage power pipe circuit; Size through control conducting electric current is controlled pressure drop, and stable voltage and protective circuit can be provided simply and effectively.
In addition; The output of voltage reference unit 14 adopts grid to connect the NMOS of falling the breadth length ratio tubular construction that the Vdd drain electrode connects electric capacity; The output of voltage reference keeps not descending with supply voltage in the certain hour when power supply decline or power down suddenly like this, and the sampled voltage of voltage detection module descends with supply voltage, can effectively voltage-stabiliser tube be closed through the error amplification module; Make and when supply voltage reduces, make voltage-stabiliser tube stop to draw electric current to supply voltage; Because voltage-stabiliser tube conducting electric current is reduced to zero, input voltage can improve under the effect of resistance-capacitance coupling or high-voltage power pipe circuit, lets chip descend or also can operate as normal during power down suddenly at power input voltage.
In the utility model embodiment; Civil power is converted into direct voltage and generates detection signal and reference voltage, carry out the conducting electric current of error result amplified control voltage regulation unit, and then control external unit and voltage regulation unit carries out step-down, voltage stabilizing according to detection signal and reference voltage; For chip is supplied power; This circuit structure is simple, volume is little, cost is low, and power supply ripple is little when being easy to realize, stablizing effect is good.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. an AC-DC overvoltage crowbar is characterized in that, said protective circuit comprises:
Civil power is carried out the step-down conversion, and output has the external unit of the direct voltage of certain ripple, and the positive and negative input of said external unit is electrically connected with outside city, and first output of said external unit is through filter capacitor C10 ground connection;
To the voltage regulation unit that said direct voltage carries out voltage stabilizing, the input of said voltage regulation unit is connected with first output of said external unit;
To the sampling of said direct voltage and carry out dividing potential drop and detect, the voltage detection unit of output detection signal, the input of said voltage detection unit is connected with first output of said external unit;
According to the voltage reference unit of a reference voltage of said direct voltage generation, the input of said voltage reference unit is connected with second output of said external unit;
Carry out the said voltage regulation unit of error amplification control through said detection signal and said reference voltage and draw electric current; To realize the error amplifying unit of voltage stabilizing control; The inverting input of said error amplifying unit is connected with the output of said voltage reference unit; The positive input of said error amplifying unit is connected with the output of said voltage detection unit; The output of said error amplifying unit is connected with the feedback end of said voltage regulation unit, and the power end of said error amplifying unit is connected with second output of said external unit, the earth terminal ground connection of said error amplifying unit.
2. protective circuit as claimed in claim 1 is characterized in that, said external unit comprises:
Resistance R 1, resistance R 2, capacitor C 1, capacitor C 2, capacitor C 3, diode D0, diode D1, diode D2, diode D3;
The anode of said diode D0 is that the positive input terminal of said external unit is connected with the negative electrode of said diode D1; The negative electrode of said diode D0 is connected with the negative electrode of said diode D2; The anode of said diode D2 is connected with the negative electrode of said diode D3; The negative electrode of said diode D3 is connected with an end of said resistance R 1 and said capacitor C 1 simultaneously; The other end of said resistance R 1 is that the negative input end of said external unit is connected with the other end of said capacitor C 1, and the anode of the anode of said diode D1 and said diode D3 is ground connection simultaneously, and an end of said capacitor C 2 is that first output of said external unit is connected with the negative electrode of said diode D0; The other end ground connection of said capacitor C 2; One end of said resistance R 2 is connected with the negative electrode of said diode D0, and the other end of said resistance R 2 is that second output of said external unit is connected the other end ground connection of said capacitor C 3 with the end of the said C3 of electric capacity.
3. protective circuit as claimed in claim 1 is characterized in that, said external unit comprises:
Resistance R 3, resistance R 4, capacitor C 4, capacitor C 5, capacitor C 6, diode D4, diode D5, diode D6, diode D7, the first high-voltage power pipe;
The anode of said diode D4 is that the positive input terminal of said external circuits is connected with the negative electrode of said diode D5; The negative electrode of said diode D4 is connected with the negative electrode of said diode D6; The anode of said diode D6 is that the negative input end of said external unit is connected with the negative electrode of said diode D7; The anode of the anode of said diode D7 and said diode D5 is ground connection simultaneously, and an end of said capacitor C 4 is connected with the negative electrode of said diode D4, the other end ground connection of said capacitor C 4; One end of said resistance R 3 is connected with the negative electrode of said diode D4 simultaneously; The other end of said resistance R 3 is that first output of said external unit is connected with the control end of the said first high-voltage power pipe, and the input of the said first high-voltage power pipe is connected with an end of said resistance R 3, and the output of the said first high-voltage power pipe is connected with an end of said capacitor C 5; The other end ground connection of said capacitor C 5; One end of said resistance R 4 is connected with the output of the said first high-voltage power pipe simultaneously, and the other end of said resistance R 4 is that second output of said external unit is connected the other end ground connection of said capacitor C 6 with an end of said capacitor C 6.
4. protective circuit as claimed in claim 3; It is characterized in that; The said first high-voltage power pipe is a NPN type high-voltage power triode; The control end of the said first high-voltage power pipe is the base stage of said NPN type high-voltage power triode, and the input of the said first high-voltage power pipe is the collector electrode of said NPN type high-voltage power triode, and the output of the said first high-voltage power pipe is the emitter of said NPN type high-voltage power triode.
5. protective circuit as claimed in claim 1 is characterized in that, said voltage regulation unit comprises:
Compensating module and second switch pipe pipe Q2;
The input of said second switch pipe is the input of said voltage regulation unit; The control end of said second switch pipe is that the feedback end of said voltage regulation unit is connected with the input of said compensating module, and the output of said second switch pipe and the output of said compensating module be ground connection simultaneously.
6. protective circuit as claimed in claim 5; It is characterized in that; Said second switch pipe is a N type metal-oxide-semiconductor; The control end of said second switch pipe is the grid of said N type metal-oxide-semiconductor, and the input of said second switch pipe is the drain electrode of said N type metal-oxide-semiconductor, and the output of said second switch pipe is the source class of said N type metal-oxide-semiconductor.
7. protective circuit as claimed in claim 1 is characterized in that, said voltage detection unit comprises:
Resistance R 5 and resistance R 6;
One end of said resistance R 5 is the input of said voltage detection unit, and the other end of said resistance R 5 is that the output of said voltage detection unit is connected the other end ground connection of said resistance R 6 with an end of said resistance R 6.
8. protective circuit as claimed in claim 1 is characterized in that, said voltage reference unit comprises:
Start module, band-gap reference module, the 3rd switching tube, capacitor C 7;
The input of the input of said startup module and said band-gap reference module is the input of said voltage reference unit simultaneously; The output of said startup module is connected with the control end of said band-gap reference module; The output of said band-gap reference module is connected with said the 3rd output end of switching tube; Said the 3rd control end of switching tube is connected with the input of said band-gap reference module, and the input of said the 3rd switching tube is that the output of said voltage reference unit is through said capacitor C 7 ground connection.
9. protective circuit as claimed in claim 8; It is characterized in that; Said the 3rd switching tube is a N type metal-oxide-semiconductor; Said the 3rd control end of switching tube is the grid of said N type metal-oxide-semiconductor, and the input of said the 3rd switching tube is the drain electrode of said N type metal-oxide-semiconductor, and said the 3rd output end of switching tube is the source electrode of said N type metal-oxide-semiconductor.
10. a chip power change-over circuit is characterized in that, the protective circuit of voltage regulation in the said chip power change-over circuit is like each described protective circuit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200661072U CN202513837U (en) | 2012-02-27 | 2012-02-27 | AC-DC voltage stabilizing protection circuit and chip power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200661072U CN202513837U (en) | 2012-02-27 | 2012-02-27 | AC-DC voltage stabilizing protection circuit and chip power conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202513837U true CN202513837U (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200661072U Expired - Lifetime CN202513837U (en) | 2012-02-27 | 2012-02-27 | AC-DC voltage stabilizing protection circuit and chip power conversion circuit |
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| Country | Link |
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| CN (1) | CN202513837U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594167A (en) * | 2012-02-27 | 2012-07-18 | 深圳市富满电子有限公司 | AC-DC (alternating-current/direct-current) voltage stabilizing protection circuit and chip power conversion circuit |
| CN109521828A (en) * | 2018-12-29 | 2019-03-26 | 惠州华科电器有限公司 | Linear voltage-stabilizing circuit |
-
2012
- 2012-02-27 CN CN2012200661072U patent/CN202513837U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594167A (en) * | 2012-02-27 | 2012-07-18 | 深圳市富满电子有限公司 | AC-DC (alternating-current/direct-current) voltage stabilizing protection circuit and chip power conversion circuit |
| CN102594167B (en) * | 2012-02-27 | 2014-10-01 | 深圳市富满电子有限公司 | AC-DC (alternating-current/direct-current) voltage stabilizing protection circuit and chip power conversion circuit |
| CN109521828A (en) * | 2018-12-29 | 2019-03-26 | 惠州华科电器有限公司 | Linear voltage-stabilizing circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN FUMAN ELECTRONICS GROUP CO., LTD. Free format text: FORMER NAME: SHENZHEN FINE MADE ELECTRONICS CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 518000 main building of Tian An digital Times Building, Che Kung Temple Industrial Zone, Shennan West Road, Futian District, Guangdong, Shenzhen, 2403A-1 Patentee after: Limited company of Fu Man electronics group of Shenzhen Address before: As the industrial workshop of Futian District Meilin road Shenzhen city Guangdong province 518000 floor Patentee before: Shenzhen Fuman Electronic Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20121031 |
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| CX01 | Expiry of patent term |