CN2842515Y - Linear stabilized power-supply circuit - Google Patents
Linear stabilized power-supply circuit Download PDFInfo
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- CN2842515Y CN2842515Y CN 200520059525 CN200520059525U CN2842515Y CN 2842515 Y CN2842515 Y CN 2842515Y CN 200520059525 CN200520059525 CN 200520059525 CN 200520059525 U CN200520059525 U CN 200520059525U CN 2842515 Y CN2842515 Y CN 2842515Y
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Abstract
A linear stabilized power-supply circuit comprises an operational amplifier, and the opposite phase of the operational amplifier is input a reference voltage, and the in-phase input terminal of the operational amplifier is coupled to a load and the output terminal of the operational amplifier outputs a control voltage; a regulator circuit which includes a control terminal of the regulator circuit, an input terminal of the regulator circuit and an output terminal of the regulator circuit and the control terminal of the regulator circuit is input the control voltage to control the conductive capacity of the regulator circuit, the input terminal of the regulator circuit is input a system voltage, and the output terminal of the regulator circuit supplies power to the load; a discharge circuit which includes a control terminal of the discharge circuit, an input terminal of the discharge circuit and an output terminal of the discharge circuit, wherein the control terminal of the discharge circuit is input the control voltage to control the conduction and cutoff of the discharge circuit, the input terminal of the discharge circuit couples the load, and the output terminal of the discharge circuit connects to the ground. When a turning current is formed, the discharge circuit conducts and derivesthe electric charge. This avoids the electric charge aggregating in the circuit to make the voltage of the circuit rise to ensure the security and the service time of the circuit.
Description
[technical field]
The utility model relates to a kind of linear voltage-stabilized power supply circuit, is meant a kind of linear voltage-stabilized power supply circuit with discharging function especially.
[background technology]
In the motherboard design, the design of power circuit can directly have influence on the quality of whole motherboard.Linear voltage-stabilized power supply circuit since its output voltage to the reacting condition of input voltage or load rapidly, the ripple of output voltage with noise is lower, circuit framework simply, volume is less, price is comparatively cheap, becomes the main flow of miniwatt step-down and mu balanced circuit.
Please referring to Fig. 1, be the disclosed a kind of linear voltage-stabilized power supply circuit of prior art, it is used to the Front Side Bus on the motherboard that 1.2V is provided voltage, and it comprises an operational amplifier 1 and a field effect transistor 2.The normal phase input end of described operational amplifier 1 is imported the reference voltage Vref of a 1.2V, its inverting input is coupled to load 5, its output terminal is to the grid output one control voltage of described field effect transistor 2, a 3.3V voltage Vin is imported in the drain electrode of described field effect transistor 2, and its source electrode provides power supply to described load 5.Described linear voltage-stabilized power supply circuit is according to the variation with respect to described reference voltage Vref of the voltage of described load 5, by the ducting capacity of the described field effect transistor 2 of described operational amplifier 1 control, thereby regulates the voltage of described load 5, makes its voltage be stabilized in 1.2V.
But on motherboard, because central processing unit (Central Processing Unit, CPU) voltage and north bridge chips usually be inequality, there is a voltage difference between the two, when the front end bus is in off working state, described voltage difference can form refoulement electric current (back-drive current), described electric current flows to electronegative potential one end from noble potential one end, because described linear voltage-stabilized power supply circuit does not have discharging function, the electric current that flows back to simultaneously can not be by the consumed in circuitry of described electronegative potential one end, therefore accumulation is in circuit inside, the voltage of described linear voltage-stabilized power supply circuit can be risen, when voltage surpasses the adjustable scope of power circuit, can damage circuit component, influence the life-span of circuit.
[utility model content]
In view of above content, be necessary to provide a kind of linear voltage-stabilized power supply circuit with discharging function.
A kind of linear voltage-stabilized power supply circuit, it comprises an operational amplifier, and its inverting input is imported a reference voltage, and its normal phase input end is coupled to a load, its output terminal output one control voltage; One adjusts circuit, it comprises that one adjusts circuit control end, an adjustment circuit input end and an adjustment circuit output end, described adjustment circuit control end is imported described control voltage to control its ducting capacity, described adjustment circuit input end is imported a system voltage, and described adjustment circuit output end is to described electric; One discharge circuit, it comprises a discharge circuit control end, a discharge circuit input end and a discharge circuit output terminal, described discharge circuit control end is imported described control voltage to control its conducting and to end, described discharge circuit input end is coupled to described load, described discharge circuit output head grounding.
With respect to prior art, described linear voltage-stabilized power supply circuit comprises described discharge circuit, and when described load formed the refoulement electric current, described discharging circuit conduction was derived electric charge, avoid accumulation that circuit voltage is risen, thereby can guarantee circuit safety and serviceable life.
[description of drawings]
Fig. 1 is the circuit diagram of linear voltage-stabilized power supply circuit of the prior art.
Fig. 2 is the circuit diagram of the utility model first preferable concrete real mode linear voltage-stabilized power supply circuit.
Fig. 3 is the circuit diagram of the utility model second preferable concrete real mode linear voltage-stabilized power supply circuit.
[embodiment]
In conjunction with embodiment the utility model is further described with reference to the accompanying drawings.
See also Fig. 2, the utility model first preferable embodiment linear voltage-stabilized power supply circuit, it comprises that an operational amplifier 10, is used for the adjustment circuit 20 and a discharge circuit 30 of step-down.Described adjustment circuit 20 comprises that a P channel depletion type field effect transistor Q1, adjusts circuit control end 201, and adjusts a circuit input end 202 and an adjustment circuit output end 203, the gate coupled of described field effect transistor Q1 is to described adjustment circuit control end 201, the source-coupled of described field effect transistor Q1 is to described adjustment circuit input end 202, and the drain coupled of described field effect transistor Q1 is to described adjustment circuit output end 203.Described discharge circuit 30 comprises a NPN transistor Q2, a current-limiting resistance R1, a discharge circuit control end 301, a discharge circuit input end 302 and a discharge circuit output terminal 303, the base stage of described transistor Q2 is coupled to described discharge circuit control end 301 via described current-limiting resistance R1, the collector coupled of described transistor Q2 is to described discharge circuit input end 302, and the emitter-coupled of described transistor Q2 is to described discharge circuit output terminal 303.
The inverting input of described operational amplifier 10 is imported the reference voltage Vref of a 1.2V; Its normal phase input end is coupled to a load 50; Its output terminal is to described adjustment circuit control end 201 and discharge circuit control end 301 outputs one control voltage, and described control voltage is in order to control the ducting capacity of described adjustment circuit 20 and discharge circuit 30; Its positive power source terminal input 12V voltage; Its negative power end ground connection.The voltage of described adjustment circuit input end 202 inputs one 3.3V; Described adjustment circuit output end 203 is coupled to described load 50.Described discharge circuit input end 302 is coupled to described load 50; Described discharge circuit output terminal 303 ground connection.
In this embodiment, described field effect transistor Q1 is a P channel depletion type field effect transistor, that is to say its pinch-off voltage on the occasion of, in the conducting during less than described pinch-off voltage of its grid voltage, its grid voltage ends during greater than described pinch-off voltage; Described transistor Q2 is a NPN transistor, that is to say its forward voltage also be one on the occasion of, when the described transistor Q2 conducting during greater than described forward voltage of the base stage input voltage of described transistor Q2, when the base stage input voltage of described transistor Q2 during less than described forward voltage described transistor Q2 end.
During work, feed back to described adjustment circuit control end 201 and described discharge circuit control end 301 after the variation amplification of voltage with respect to described reference voltage Vref of described operational amplifier 10 with described load 50.
When the voltage of described load 50 fluctuateed about 1.2V, the voltage of described operational amplifier 10 output terminals output was less than described pinch-off voltage, described adjustment circuit 20 conductings, and described discharge circuit 30 ends.At this moment, described linear voltage-stabilized power supply circuit is in voltage stabilizing, power supply state, and when described load 50 voltages rose with respect to described reference voltage Vref, the ducting capacity of described adjustment circuit 20 weakened, the electric current of the described load 50 of flowing through is reduced, to reduce the voltage of described load 50; When the voltage of described load 50 reduced with respect to described reference voltage Vref, the ducting capacity of described adjustment circuit 20 strengthened, and the electric current that flows through described load 50 is increased, and with the voltage of the described load 50 that raises, thus, can make the voltage of load 50 be stabilized in 1.2V.
When the voltage of described load 50 rises, when its ascensional range made the voltage of described operational amplifier 10 output terminals output greater than the pinch-off voltage of described adjustment circuit 20, described adjustment circuit 20 ended, and 30 conductings of described discharge circuit.At this moment, described line style stabilized voltage supply is in discharge condition, is derived via described discharge circuit 30 by the refoulement electric current that the voltage of described load 50 forms.
Please referring to Fig. 3, the utility model second preferable embodiment linear voltage-stabilized power supply circuit, with respect to the first preferable embodiment, discharge circuit 32 comprises a N channel enhancement field effect transistor Q4, a discharge circuit control end 321, a discharge circuit input end 322 and a discharge circuit output terminal 323, the gate coupled of described field effect transistor Q4 is to described discharge circuit control end 321, the drain coupled of described field effect transistor Q4 is to described discharge circuit input end 322, and the source-coupled of described field effect transistor Q4 is to described discharge circuit output terminal 323.
Except that the preferable embodiment of the above, the utility model person of ordinary skill in the field also can use prior art to comply with design of the present utility model and do equivalent transformation.
Claims (5)
1. linear voltage-stabilized power supply circuit, it comprises an operational amplifier, and its inverting input is imported a reference voltage, and its normal phase input end is coupled to a load, its output terminal output one control voltage; One adjusts circuit, it comprises that one adjusts circuit control end, an adjustment circuit input end and an adjustment circuit output end, described adjustment circuit control end is imported described control voltage to control its ducting capacity, described adjustment circuit input end is imported a system voltage, and described adjustment circuit output end is to described electric; It is characterized in that: described linear voltage-stabilized power supply circuit also comprises a discharge circuit, described discharge circuit comprises a discharge circuit control end, a discharge circuit input end and a discharge circuit output terminal, described discharge circuit control end is imported described control voltage to control its conducting and to end, described discharge circuit input end is coupled to described load, described discharge circuit output head grounding.
2. linear voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that: described adjustment circuit comprises a P channel depletion type field effect transistor, the gate coupled of described field effect transistor is to described adjustment circuit control end, the source-coupled of described field effect transistor is to described adjustment circuit input end, and the drain coupled of described field effect transistor is to described adjustment circuit output end.
3. linear voltage-stabilized power supply circuit as claimed in claim 2, it is characterized in that: described discharge circuit comprises a NPN transistor, described transistorized base stage is coupled to described discharge circuit control end, described transistorized collector coupled is to described discharge circuit input end, and described transistorized emitter-coupled is to described discharge circuit output terminal.
4. linear voltage-stabilized power supply circuit as claimed in claim 3 is characterized in that: described discharge circuit also comprises a current-limiting resistance, and described transistorized base stage is coupled to described discharge circuit control end via described current-limiting resistance.
5. linear voltage-stabilized power supply circuit as claimed in claim 2, it is characterized in that: described discharge circuit comprises a N channel enhancement field effect transistor, the gate coupled of described field effect transistor is to described discharge circuit control end, the drain coupled of described field effect transistor is to described discharge circuit input end, and the source-coupled of described field effect transistor is to described discharge circuit output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520059525 CN2842515Y (en) | 2005-06-01 | 2005-06-01 | Linear stabilized power-supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520059525 CN2842515Y (en) | 2005-06-01 | 2005-06-01 | Linear stabilized power-supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2842515Y true CN2842515Y (en) | 2006-11-29 |
Family
ID=37446394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520059525 Expired - Fee Related CN2842515Y (en) | 2005-06-01 | 2005-06-01 | Linear stabilized power-supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2842515Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736655A (en) * | 2011-04-07 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN112433555A (en) * | 2019-08-26 | 2021-03-02 | 华邦电子股份有限公司 | Voltage stabilizer and control method of voltage stabilizer |
-
2005
- 2005-06-01 CN CN 200520059525 patent/CN2842515Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736655A (en) * | 2011-04-07 | 2012-10-17 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| CN102736655B (en) * | 2011-04-07 | 2014-04-30 | 鸿富锦精密工业（深圳）有限公司 | Linear voltage stabilizing circuit |
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN112433555A (en) * | 2019-08-26 | 2021-03-02 | 华邦电子股份有限公司 | Voltage stabilizer and control method of voltage stabilizer |
| CN112433555B (en) * | 2019-08-26 | 2022-07-12 | 华邦电子股份有限公司 | Voltage stabilizer and control method of voltage stabilizer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061129 Termination date: 20100601 |