CN101931317A - Power supply start control circuit and power supply - Google Patents
Power supply start control circuit and power supply Download PDFInfo
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- CN101931317A CN101931317A CN2009101082718A CN200910108271A CN101931317A CN 101931317 A CN101931317 A CN 101931317A CN 2009101082718 A CN2009101082718 A CN 2009101082718A CN 200910108271 A CN200910108271 A CN 200910108271A CN 101931317 A CN101931317 A CN 101931317A
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Abstract
The invention relates to a power supply start control circuit and a power supply using the same. The control circuit comprises an undervoltage protection branch, a voltage-stabilizing branch and a current control branch, wherein the undervoltage protection branch can realize different undervoltage protection starts by adjusting a voltage-regulating value of a voltage-regulator tube and reduce low-voltage loss, the voltage-stabilizing branch can realize the voltage-regulating function by two oppositely series-connected voltage-regulating tubes, and the current control branch has a current limiting and adjusting function. The power supply start control circuit and the power supply can realize the functions of undervoltage protection, voltage regulation and current limiting adjustment.
Description
Technical field
The present invention relates to the power technology association area, more particularly, relate to a kind of power supply that has the energy supply startup control circuit of under-voltage protection, voltage stabilizing and current limliting adjusting and use this energy supply startup control circuit.
Background technology
The start-up circuit of conventional switch power control circuit as shown in Figure 1, this start-up circuit is made of current-limiting resistance, voltage stabilizing didoe and filter capacitor.Because what the electric current of this start-up circuit was subjected to input voltage influences meeting along with input voltage changes, thereby cause instability start-up time, and under the low pressure situation, also can start, will cause the power supply cisco unity malfunction like this, and there is loss in whole start-up circuit always, and the loss of whole power supply also exists always.
Summary of the invention
The technical problem to be solved in the present invention is, the above-mentioned defective at the start-up circuit of conventional switch power control circuit provides a kind of energy supply startup control circuit that under-voltage protection, voltage stabilizing and current limliting are regulated that has.
Simultaneously, the present invention also provides a kind of power supply that under-voltage protection, voltage stabilizing and current limliting are regulated energy supply startup control circuit that has.
A kind of energy supply startup control circuit, it comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road.Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, first resistance and second resistance, the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of second voltage-stabiliser tube connects the negative electrode of the 3rd voltage-stabiliser tube, one end of first resistance and the series connection of an end of second resistance, the anode of another termination second voltage-stabiliser tube of first resistance; Described voltage stabilizing branch road comprises the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube, and the anode of the 4th voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube joins; Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground; The base stage of described triode is received the negative electrode of the 4th voltage-stabiliser tube and the other end of second resistance, and the collector electrode of described triode connects the anode of the 3rd voltage-stabiliser tube, and the anode of the 5th voltage-stabiliser tube is received working power.
A kind of energy supply startup control circuit, it comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road.Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, protective resistance, and the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, and the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of a termination first voltage-stabiliser tube of described protective resistance; Described voltage stabilizing branch road comprises the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube, and the anode of the 3rd voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube joins; Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground; The base stage of described triode is received the negative electrode of the 3rd voltage-stabiliser tube and the other end of described protective resistance, and the collector electrode of described triode connects the anode of second voltage-stabiliser tube; The anode of the 4th voltage-stabiliser tube is received working power.
A kind of power supply, it comprises energy supply startup control circuit.This energy supply startup control circuit comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road.Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, first resistance and second resistance, the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of second voltage-stabiliser tube connects the negative electrode of the 3rd voltage-stabiliser tube, one end of first resistance and the series connection of an end of second resistance, the anode of another termination second voltage-stabiliser tube of first resistance; Described voltage stabilizing branch road comprises the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube, and the anode of the 4th voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube joins; Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground; The base stage of described triode is received the negative electrode of the 4th voltage-stabiliser tube and the other end of second resistance, and the collector electrode of described triode connects the anode of the 3rd voltage-stabiliser tube, and the anode of the 5th voltage-stabiliser tube is received working power.
A kind of power supply, it comprises energy supply startup control circuit.This energy supply startup control circuit comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road.Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, protective resistance, and the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, and the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of a termination first voltage-stabiliser tube of described protective resistance; Described voltage stabilizing branch road comprises the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube, and the anode of the 3rd voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube joins; Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground; The base stage of described triode is received the negative electrode of the 3rd voltage-stabiliser tube and the other end of described protective resistance, and the collector electrode of described triode connects the anode of second voltage-stabiliser tube; The anode of the 4th voltage-stabiliser tube is received working power.
Implement technical scheme of the present invention, have following beneficial effect: because energy supply startup control circuit of the present invention and power supply have under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road; The under-voltage protection branch road can realize that different under-voltage protections starts, and can reduce the low pressure loss by regulating the voltage stabilizing value of voltage-stabiliser tube; The voltage stabilizing branch road can be realized voltage stabilizing function by the voltage-stabiliser tube of two incorgruous series connection; The Current Control branch road has the current limliting regulatory function; Therefore energy supply startup control circuit of the present invention and power supply can be realized under-voltage protection, voltage stabilizing and current limliting regulatory function.
In addition, energy supply startup control circuit of the present invention is applied to can lower in the Switching Power Supply loss and realizes energy-conservation.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of the start-up circuit of conventional switch power control circuit;
Fig. 2 is the block diagram of energy supply startup control circuit of the present invention;
Fig. 3 is the circuit diagram of first preferred embodiment of energy supply startup control circuit of the present invention;
Fig. 4 is the application circuit of first preferred embodiment of energy supply startup control circuit of the present invention;
Fig. 5 is the circuit diagram of second preferred embodiment of energy supply startup control circuit of the present invention.
Embodiment
As shown in Figure 2, be the block diagram of energy supply startup control circuit of the present invention.Energy supply startup control circuit of the present invention comprises under-voltage protection branch road 1, voltage stabilizing branch road 2 and Current Control branch road 3.Wherein, under-voltage protection branch road 1 comprises voltage-stabiliser tube, at least one protective resistance of at least two series aiding connections, and wherein the negative electrode of a voltage-stabiliser tube connects the voltage positive input terminal, by regulating the voltage stabilizing value of voltage-stabiliser tube, realizes that different under-voltage protections starts.Voltage stabilizing branch road 2 comprises the voltage-stabiliser tube of two incorgruous series connection, realizes voltage stabilizing function.Current Control branch road 3 comprises current-limiting resistance, according to the constant voltage realization current limliting regulatory function of voltage stabilizing branch road 2 outputs.
As shown in Figure 3, be the circuit diagram of first preferred embodiment of energy supply startup control circuit of the present invention.In this preferred embodiment, under-voltage protection branch road 1 comprises the voltage-stabiliser tube of three series aiding connections, two protective resistances.Promptly; under-voltage protection branch road 1 comprises the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2, the 3rd voltage-stabiliser tube ZD3, first resistance R 1 and second resistance R 2; the negative electrode of the first voltage-stabiliser tube ZD1 meets voltage positive input terminal VIN+; the anode of the first voltage-stabiliser tube ZD1 connects the negative electrode of the second voltage-stabiliser tube ZD2; the anode of the second voltage-stabiliser tube ZD2 connects the negative electrode of the 3rd voltage-stabiliser tube ZD3; the one end series connection of one end of first resistance R 1 and second resistance R 2, the anode of another termination second voltage-stabiliser tube ZD2 of first resistance R 1.Voltage stabilizing branch road 2 comprises the 4th voltage-stabiliser tube D4 and the 5th voltage-stabiliser tube D5, and the anode of the 4th voltage-stabiliser tube D4 is received voltage negative input VIN-and GND, and the negative electrode of the negative electrode of the 4th voltage-stabiliser tube D4 and the 5th voltage-stabiliser tube D5 joins.Current Control branch road 3 comprises triode Q1, current-limiting resistance R3 and filter capacitor C1, the emitter of triode Q1 with receive working power VCC after current-limiting resistance R3 connects, filter capacitor C1 is connected in parallel between working power VCC and the GND.And the base stage of triode Q1 is received the negative electrode of the 4th voltage-stabiliser tube D4 and the other end of second resistance R 2, and the collector electrode of triode Q1 connects the anode of the 3rd voltage-stabiliser tube ZD3, and the anode of the 5th voltage-stabiliser tube D5 is received working power VCC.
When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is higher than the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three voltage stabilizing value sum, voltage is arranged on the working power VCC.When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is lower than the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three voltage stabilizing value sum, there is not voltage on the working power VCC.So, can realize that different under-voltage protections starts by regulating the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three's voltage stabilizing value.So a plurality of voltage-stabiliser tubes are together in series and on higher input voltage, use, can obtain different burning voltages.When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-only is lower than the voltage stabilizing value of the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2, there is not voltage on the working power VCC, the loss of this start-up control circuit is zero.So, can regulate the first voltage-stabiliser tube ZD1, both voltage stabilizing values of the second voltage-stabiliser tube ZD2 as required, realize reducing different low pressure losses.
Voltage-stabiliser tube is when reverse breakdown, and in certain current range (in other words in certain power loss scope), terminal voltage is almost constant, shows stabilized voltage characteristic.Because the terminal voltage behind the voltage-stabiliser tube reverse breakdown is stablized constant, so the emitter junction forward conduction voltage of triode Q1 is also constant substantially, the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-was changed, and the collector current of triode Q1 can not change yet.So the size of current of the operating current I of start-up control circuit is: I=(V
ZD5-0.7)/R3.Magnitude of voltage on the working power VCC is the voltage difference between the 4th voltage-stabiliser tube D4 and the 5th voltage-stabiliser tube ZD5, i.e. VCC=V
ZD4-V
ZD5
As shown in Figure 4, be the application circuit of first preferred embodiment of energy supply startup control circuit of the present invention.This application circuit in conjunction with the auxiliary winding circuit of switching mode power supply transformer, forms a Switching Power Supply start-up control circuit on the basis of the energy supply startup control circuit that Fig. 3 provides.
The Switching Power Supply start-up control circuit of present embodiment comprises energy supply startup control circuit 100 and auxiliary winding circuit 200 two parts of switching mode power supply transformer, and the auxiliary winding circuit 200 of switching mode power supply transformer provides the startup operating voltage for energy supply startup control circuit 100.
In energy supply startup control circuit 100, the negative electrode of the first voltage-stabiliser tube ZD1 meets voltage positive input terminal VIN+, the anode of the first voltage-stabiliser tube ZD1 connects the negative electrode of the second voltage-stabiliser tube ZD2, the anode of the second voltage-stabiliser tube ZD2 connects the negative electrode of the 3rd voltage-stabiliser tube ZD3, the anode of the 3rd voltage-stabiliser tube ZD3 connects the collector electrode of triode Q1, the anode of first resistance R 1 and second resistance R, 2 series connection back one termination, the second voltage-stabiliser tube ZD2, the base stage of one termination triode Q1, the base stage of triode Q1 also connects the negative electrode of the 4th voltage-stabiliser tube D4 and the negative electrode of the 5th voltage-stabiliser tube D5, the anode of the 4th voltage-stabiliser tube D4 meets voltage negative input VIN-and GND, the anode of the 5th voltage-stabiliser tube D5 is received working power VCC, the emitter of triode Q1 with receive working power VCC after the 3rd resistance is connected, electric capacity is connected in parallel between working power VCC and the GND.
In the auxiliary winding circuit 200 of switching mode power supply transformer, voltage-stabiliser tube ZD6 and triode Q3 form DC voltage-stabilizing output circuit, guarantee the dc high voltage that transformer T1 provides is converted to the DC low-voltage of 15V.Voltage-stabiliser tube ZD6 also can protect triode Q3 can not damage because of output current is excessive.
In the present embodiment, the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-can be between 170V to 420V, and it is the voltage-stabiliser tube of 51V that the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 all preferably select the voltage stabilizing value for use; It is the voltage-stabiliser tube of 15V that the 4th voltage-stabiliser tube ZD4 and the 5th voltage-stabiliser tube ZD5 all preferably select the voltage stabilizing value for use; Triode Q1, triode Q2, triode Q3 are NPN type triode.
When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is higher than the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three voltage stabilizing value sum, voltage is arranged on the working power VCC, be the burning voltage that the auxiliary winding circuit 200 of switching mode power supply transformer provides.
When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is lower than the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three voltage stabilizing value sum, there is not voltage on the working power VCC, realized under-voltage protection function.And can realize that different under-voltage protections starts, and regulates under-voltage start-up time by regulating the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2 and the 3rd voltage-stabiliser tube ZD3 three's voltage stabilizing value.
When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-only is lower than the voltage stabilizing value of the first voltage-stabiliser tube ZD1, the second voltage-stabiliser tube ZD2, there is not voltage on the working power VCC, the loss of this start-up control circuit is zero.So, can regulate the first voltage-stabiliser tube ZD1, both voltage stabilizing values of the second voltage-stabiliser tube ZD2 as required, realize reducing different low pressure losses, the power consumption when reducing transformer T1 operate as normal.
The operating voltage VCC=V of energy supply startup control circuit 100
ZD4-V
ZD5, the electric current I of operating current I=(V
ZD5-0.7)/R3, and can select the voltage stabilizing value of the 5th voltage-stabiliser tube ZD5 and the resistance of resistance R 3 to regulate starting current according to needs, realize the Current Control function.
Shown in Figure 5, be the circuit diagram of second preferred embodiment of energy supply startup control circuit of the present invention.In this preferred embodiment, under-voltage protection branch road 1 comprises the voltage-stabiliser tube of two series aiding connections, a protective resistance.
Promptly; under-voltage protection branch road 1 comprises the first voltage-stabiliser tube ZD11, the second voltage-stabiliser tube ZD12, protective resistance R11; the negative electrode of the first voltage-stabiliser tube ZD11 meets voltage positive input terminal VIN+; the anode of the first voltage-stabiliser tube ZD11 connects the negative electrode of the second voltage-stabiliser tube ZD12, the anode of a termination first voltage-stabiliser tube ZD11 of protective resistance R11.Voltage stabilizing branch road 2 comprises the 3rd voltage-stabiliser tube ZD13 and the 4th voltage-stabiliser tube ZD14, and the anode of the 3rd voltage-stabiliser tube ZD13 is received voltage negative input VIN-and GND, and the negative electrode of the negative electrode of the 3rd voltage-stabiliser tube ZD13 and the 4th voltage-stabiliser tube ZD14 joins.Current Control branch road 3 comprises triode Q11, current-limiting resistance R12 and filter capacitor C11, the emitter of triode Q11 with receive working power VCC after current-limiting resistance R12 connects, filter capacitor C11 is connected in parallel between working power VCC and the GND.And the base stage of triode Q11 is received the negative electrode of the 3rd voltage-stabiliser tube ZD13 and the other end of protective resistance R11, and the collector electrode of triode Q11 connects the anode of the second voltage-stabiliser tube ZD12; The anode of the 4th voltage-stabiliser tube ZD14 is received working power VCC.
When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is higher than the first voltage-stabiliser tube ZD11 and the second voltage-stabiliser tube ZD12 voltage stabilizing value sum, voltage is arranged on the working power VCC.When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-is lower than the first voltage-stabiliser tube ZD11 and the second voltage-stabiliser tube ZD12 voltage stabilizing value sum, there is not voltage on the working power VCC.So, can realize that different under-voltage protections starts by regulating the voltage stabilizing value of the first voltage-stabiliser tube ZD11 and the second voltage-stabiliser tube ZD12.When the magnitude of voltage of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-only is lower than the voltage stabilizing value of the first voltage-stabiliser tube ZD11, there is not voltage on the working power VCC, the loss of this start-up control circuit is zero.So, can regulate the voltage stabilizing value of the first voltage-stabiliser tube ZD11 as required, realize reducing different low pressure losses.
Voltage-stabiliser tube is when reverse breakdown, and in certain current range (in other words in certain power loss scope), terminal voltage is almost constant, shows stabilized voltage characteristic.Because the voltage behind the voltage-stabiliser tube reverse breakdown is stablized constant, so, the emitter junction forward conduction voltage of triode Q11 is also constant substantially, the magnitude of voltage value of importing between voltage positive input terminal VIN+ and the voltage negative input VIN-was changed, and the collector current of triode Q1 can not change yet.
So the size of current of the operating current I of start-up control circuit is: I=(V
ZD14-0.7)/R13.Magnitude of voltage on the working power VCC is the voltage difference between the 3rd voltage-stabiliser tube DZ13 and the 4th voltage-stabiliser tube ZD14, i.e. VCC=V
ZD13-V
ZD14
In the energy supply startup control circuit of the present invention, the under-voltage protection branch road comprises the voltage-stabiliser tube of at least two series aiding connections, and the quantity of voltage-stabiliser tube and voltage stabilizing value can be selected according to actual demand to determine.
The above only is embodiments of the invention, not in order to restriction the present invention, all any modifications of being done in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (4)
1. an energy supply startup control circuit is characterized in that, comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road,
Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, first resistance and second resistance, the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of second voltage-stabiliser tube connects the negative electrode of the 3rd voltage-stabiliser tube, one end of first resistance and the series connection of an end of second resistance, the anode of another termination second voltage-stabiliser tube of first resistance;
Described voltage stabilizing branch road comprises the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube, and the anode of the 4th voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube joins;
Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground;
The base stage of described triode is received the negative electrode of the 4th voltage-stabiliser tube and the other end of second resistance, and the collector electrode of described triode connects the anode of the 3rd voltage-stabiliser tube, and the anode of the 5th voltage-stabiliser tube is received working power.
2. an energy supply startup control circuit is characterized in that, comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road,
Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, protective resistance, and the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, and the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of a termination first voltage-stabiliser tube of described protective resistance;
Described voltage stabilizing branch road comprises the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube, and the anode of the 3rd voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube joins;
Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground;
The base stage of described triode is received the negative electrode of the 3rd voltage-stabiliser tube and the other end of described protective resistance, and the collector electrode of described triode connects the anode of second voltage-stabiliser tube; The anode of the 4th voltage-stabiliser tube is received working power.
3. a power supply comprises energy supply startup control circuit, it is characterized in that, described energy supply startup control circuit comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road,
Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, the 3rd voltage-stabiliser tube, first resistance and second resistance, the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of second voltage-stabiliser tube connects the negative electrode of the 3rd voltage-stabiliser tube, one end of first resistance and the series connection of an end of second resistance, the anode of another termination second voltage-stabiliser tube of first resistance;
Described voltage stabilizing branch road comprises the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube, and the anode of the 4th voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 4th voltage-stabiliser tube and the 5th voltage-stabiliser tube joins;
Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground;
The base stage of described triode is received the negative electrode of the 4th voltage-stabiliser tube and the other end of second resistance, and the collector electrode of described triode connects the anode of the 3rd voltage-stabiliser tube, and the anode of the 5th voltage-stabiliser tube is received working power.
4. a power supply comprises energy supply startup control circuit, it is characterized in that, described energy supply startup control circuit comprises under-voltage protection branch road, voltage stabilizing branch road and Current Control branch road,
Described under-voltage protection branch road comprises first voltage-stabiliser tube, second voltage-stabiliser tube, protective resistance, and the negative electrode of first voltage-stabiliser tube connects the voltage positive input terminal, and the anode of first voltage-stabiliser tube connects the negative electrode of second voltage-stabiliser tube, the anode of a termination first voltage-stabiliser tube of described protective resistance;
Described voltage stabilizing branch road comprises the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube, and the anode of the 3rd voltage-stabiliser tube is received voltage negative input and ground, and the negative electrode of the negative electrode of the 3rd voltage-stabiliser tube and the 4th voltage-stabiliser tube joins;
Described Current Control branch road comprises triode, current-limiting resistance and filter capacitor, the emitter of described triode with receive working power after described current-limiting resistance is connected, described filter capacitor is connected in parallel between working power and the ground;
The base stage of described triode is received the negative electrode of the 3rd voltage-stabiliser tube and the other end of described protective resistance, and the collector electrode of described triode connects the anode of second voltage-stabiliser tube; The anode of the 4th voltage-stabiliser tube is received working power.
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| CN 200910108271 CN101931317B (en) | 2009-06-24 | 2009-06-24 | Power supply start control circuit and power supply |
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| CN 200910108271 CN101931317B (en) | 2009-06-24 | 2009-06-24 | Power supply start control circuit and power supply |
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| DE102005037409A1 (en) * | 2004-08-09 | 2006-03-30 | International Rectifier Corp., El Segundo | Start-up switch to provide a start-up voltage to an application circuit |
| CN200944560Y (en) * | 2006-09-08 | 2007-09-05 | 深圳市和而泰电子科技有限公司 | Resistance-capacitance voltage-reducing power circuit |
| CN101232171B (en) * | 2007-01-24 | 2011-04-20 | 青岛海信电器股份有限公司 | Television power supply protective circuit |
| CN201118796Y (en) * | 2007-11-20 | 2008-09-17 | 青岛海信电器股份有限公司 | Under voltage protection circuit |
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2009
- 2009-06-24 CN CN 200910108271 patent/CN101931317B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103066824A (en) * | 2012-12-19 | 2013-04-24 | 华南理工大学 | Auxiliary power supply used for switching power supply and driving method of the auxiliary power supply |
| CN103066824B (en) * | 2012-12-19 | 2015-10-28 | 华南理工大学 | The accessory power supply started for Switching Power Supply and driving method thereof |
| CN106100312A (en) * | 2016-08-25 | 2016-11-09 | 贵州航天凯山石油仪器有限公司 | A kind of DC source start-up circuit being applicable to high input impedance |
| CN106100312B (en) * | 2016-08-25 | 2018-08-28 | 贵州航天凯山石油仪器有限公司 | A kind of DC power supply start-up circuit suitable for high input impedance |
| CN109342973A (en) * | 2018-11-19 | 2019-02-15 | 中车大连电力牵引研发中心有限公司 | DC supply input status monitoring circuit and system |
| CN110265975A (en) * | 2019-05-09 | 2019-09-20 | 四川莱福德科技有限公司 | IC chip protects circuit |
| CN110265975B (en) * | 2019-05-09 | 2024-06-04 | 四川莱福德科技有限公司 | IC chip protection circuit |
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| Publication number | Publication date |
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| CN101931317B (en) | 2012-08-15 |
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