CN202331248U - Power source stabilizing device with one power source and capable of regulating voltage from zero volt - Google Patents
Power source stabilizing device with one power source and capable of regulating voltage from zero volt Download PDFInfo
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- CN202331248U CN202331248U CN 201120054455 CN201120054455U CN202331248U CN 202331248 U CN202331248 U CN 202331248U CN 201120054455 CN201120054455 CN 201120054455 CN 201120054455 U CN201120054455 U CN 201120054455U CN 202331248 U CN202331248 U CN 202331248U
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- adjustment pipe
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Abstract
A power source stabilizing device with one power source and capable of adjusting voltage from zero volt comprises an adjustment pipe, a reference circuit, a comparative amplification circuit and the like and is essentially characterized in that feedback signals of output voltage are taken from base voltage of the adjustment pipe, and adjustment of the output voltage is achieved by adjusting reference voltage of a comparative amplification link. Due to the fact that the reference voltage output by the adjustment pipe is about an emitter junction drop higher than the output voltage, when the output voltage is zero-volt, the base voltage of the adjustment pipe is still higher than zero volt to provide working voltage for a comparative amplification pipe, the adjustment pipe can be still controlled when the output voltage is zero-volt, and the circuit can achieve voltage adjustment from zero volt. When the output short circuit happens, the circuit controls the base voltage of the adjustment pipe by means of the clamping effect of a diode to protect the output short circuit. The device can be applied to experimental power sources and the like generally needing to adjust the voltage from zero volt.
Description
Technical field
The utility model relates to a kind of device that is applied to stabilized power source; It can overcome general zero and lie prostrate the shortcoming of transferring power supply need use dual power supply; Only need a power supply can realize transferring, be applied to the big or small stabilized supply apparatuses of regulation voltage of to start from scratch such as experimental power supply from zero volt.
Background technology
Present traditional modal circuit structure as shown in Figure 1 of linear stabilized power supply circuit; Its Voltage Feedback network is taken from output burning voltage two ends and is made up of R2, R3; Feedback voltage is delivered to the comparison amplifying element be made up of Q2 and reference voltage and is made comparisons and amplify the base current size of back control adjustment pipe Q1; Thereby realize control, accomplish stabilization process output voltage to output voltage.When this circuit was zero volt when output voltage, because feedback network voltage is zero, relatively amplifier tube Q2 lost base flow, and Base-Emitter reverse bias pipe is in cut-off state, and this circuit of circuit event out of hand can't be realized transferring from zero volt.
In order to realize that circuit must increase the negative sense power supply usually from zero volt conditioning function, circuit structure is as shown in Figure 2.The input of power supply E2 right and wrong direct voltage of voltage regulation is connected into negative sense output, and the DC voltage of relatively stable output is a negative supply that is in below zero volt.Because the reference voltage of the effect comparison amplifying element of E2 is in below zero volt; When output voltage arrives zero volt; Relatively base stage and the emitter junction voltage of amplifying element Q2 still exist; Q2 is in magnifying state all the time and realizes the control to output adjustment pipe Q1, thereby has guaranteed that circuit can realize from the function of zero volt accent.
The adjusting of output voltage is the sampling ratio that changes the output signal through the intrinsic standoff ratio of regulating R2, R3, realizes that through comparing amplifying element whole adjustment process reference voltage is constant all the time again.
The shortcoming of this circuit is to have increased a negative sense power supply E2; Brought complicated not only for the structure of circuit; And because this negative supply provides reference voltage; So negative supply E2 slightly ripple will directly be transmitted to output through comparing amplifying element, the performance that has influence on output stable DC voltage descends the technical indicator of stabilized power source.
Summary of the invention
The utility model technical matters to be solved is: providing a kind of only needs an input power supply just can realize that output is stable and can lie prostrate the stabilized power supply circuit device of transferring from zero; When realizing function, removed negative supply; Thereby simplify circuit structure greatly, to reduce the stability techniques index that circuit cost improves power supply.
The utility model to solve the technical scheme that its technical matters adopts and be: as shown in Figure 3; It is made up of links such as adjustment pipe Q1, reference voltage source D1, comparison amplifier tube Q2; Its essential characteristic be the emitter of comparison amplifier tube Q2 be connected on adjustment pipe Q1 base stage to obtain output voltage signal; Stabilivolt D1 and resistance R 1, R2, R3 form reference voltage circuit, and short-circuit protection diode D2 positive pole is connected on the base stage of comparison amplifier tube Q2, and negative pole is connected on the emitter of adjustment pipe Q1; Utilize the clamping action of diode D2 to realize output short circuit protection, constant current source E1 provides base bias current for the adjustment pipe.Its comparison amplifier tube triode Q2 also can use operational amplifier instead and serve as.The circuit output voltage feedback signal changes from the base stage of adjustment pipe Q1 takes out the emitter that is added in comparison amplifier tube Q2; R1, R2, R3, D1 form reference voltage circuit; The base stage that the reference voltage that go up to be obtained by D1 is added in comparison amplifier tube Q2 after through R2, R3 dividing potential drop is as output reference; Lead system Q2 emitter current through the emitter junction change in voltage of amplifier tube Q2 relatively and change output adjustment pipe Q1 base flow is controlled, thereby realize that adjusting to output voltage is with stable.Because the high all the time emitter junction bias voltage of base stage specific output voltage of adjustment pipe Q1; So relatively amplifier tube Q2 still has bias voltage to exist when output voltage is zero; This moment, amplifier tube Q2 still was operated in magnifying state; Can normally control adjustment pipe Q1 work, circuit is realized transferring the stable voltage of output from zero volt.The circuit conditioning output voltage is to form the reference voltage bleeder circuit through R2, R3 to realize; Be added in the adjusting of realization to exporting of relatively managing the Q2 base stage through changing intrinsic standoff ratio adjusting reference voltage; The output sampling voltage is constant in adjustment process, directly takes from output loop at 1: 1; It is just in time opposite with traditional circuit that the sampling of this circuit is regulated.
The utility model has the advantages that: cancelled the negative sense power supply, only used single power supply just can realize that circuit is from zero volt accent, the function of realization regulated output voltage.
Use the obtainable usefulness of the utility model that 2 points are arranged: the one, cancel the negative sense power supply and simplified circuit structure greatly; The 2nd, the output feedback sample was taken from output loop in direct 1: 1, and the feedback proportional height is strong to the ripple control ability of output, and the circuit output voltage ripple is minimum.
Description of drawings
Accompanying drawing 1 is traditional linear stabilized power supply circuit figure.
Accompanying drawing 2 is stabilized power supply circuit figure of tradition band negative sense power supply.
Accompanying drawing 3 is circuit theory diagrams of the utility model.
Accompanying drawing 4 is that the utility model output voltage is in the adjustable stabilized power source special case of 0～15V.
Embodiment
Consult R1 in Fig. 3 circuit, R2, R3, D1 and form reference circuit, obtain stable voltage at voltage stabilizing diode D1 two ends, this voltage offers the comparison amplifier be made up of the Q2 circuit benchmark as regulated output voltage after via R2, R3 dividing potential drop; Constant current source E1 provides base bias current for adjustment pipe Q1, and Q1 is in the outside output current of magnifying state circuit, and sets up output voltage; Characteristic by the adjustment pipe can know that the base voltage of Q1 is than the high emitter voltage drop of output voltage of emitter, and this voltage is added in the emitter of comparison amplifier tube Q2 and the emitter junction voltage that reference voltage forms the comparison amplifier tube jointly; When output voltage raises; Q2 emitter junction voltage raises, and the emitter current of Q2 rises, and has shunted the base flow that is partly offered Q1 adjustment pipe by E1; Thereby the output current that has reduced the Q1 pipe has reduced output voltage, has realized the stabilization process of output voltage; When regulating the intrinsic standoff ratio of R2, R3, changed the relatively base reference voltage of amplifier tube Q2, cause the change of Q2 emitter current again, this change changes the adjusting that realizes output voltage through the base flow of adjustment pipe again.
D2 diode in the circuit is formed output short circuit protection circuit; During operate as normal, the D2 voltage equates that with adjustment pipe emitter junction voltage in circuit, be in critical conduction mode, the base flow of exchanging homogeneous tube does not play shunting action basically; When output short-circuit; The negative electrode of adjustment pipe emitter and D2 is in zero volt current potential D2 conducting simultaneously; Because the clamping action of diode is clamped down on the emitter junction voltage of adjustment pipe about 0.7 volt all the time; Reduced adjustment pipe base flow, the output current size that has suppressed the adjustment pipe realizes the short-circuit protection of circuit.
Fig. 4 is a special case of the utility model circuit.Civil power is through the low-voltage AC of about 18 volts of outputs after the transformer T transformation; D1～D4, C1 form current rectifying and wave filtering circuit; Obtain a unsettled DC voltage at the C1 two ends and import power supply as circuit; R1, D5 form a miniwatt mu balanced circuit, obtain a 16V left and right sides stable benchmark voltage at the D5 two ends, and this voltage is regulated the benchmark of back as the output burning voltage by the RW dividing potential drop.FET Q1, R2 form constant-current power supply circuit provides base current for the adjustment pipe, and Q3, Q4 form complex pipe and serve as the output adjustment outside output current of pipe and set up voltage; Q2 is the comparison amplifier tube; When the output voltage signal of bringing from adjustment pipe base stage is added in emitter; After making comparisons, this voltage and Q2 base voltage determined the emitter current of Q2; When output voltage rising electric current just increases, shunted the base current that bias current that constant current source E1 sends here has reduced the adjustment pipe, also just reduce output voltage and realized the stable of output voltage.
D6 is the short-circuit protection diode, when output short-circuit, because the emitter junction voltage of the clamping action of D6 adjustment pipe is effectively clamped down on about 0.7 volt, has limited adjustment pipe base current and has also just limited short-circuit output current, thereby played the short-circuit protection effect.
The base stage that C2 is connected on the adjustment pipe is to play the High frequency filter effect to prevent the circuit self-excitation, and R3 for the Q3 leakage current provides a path, reduces Q3 pipe leakage current improves circuit to the influence of Q4 pipe controllability for the collector emitter leakage current shunt resistance of adjustment pipe.
It is 500mA that this special case can be used as the output maximum current, and output voltage is applied to miniwatt electrical equipment equipment at the adjustable stabilized power source of 0～15V scope, also can be used as breadboard experimental power supply and uses.
Claims (2)
1. a single supply zero has lied prostrate and has transferred stabilized supply apparatus; It is made up of links such as adjustment pipe Q1, reference voltage source D1, comparison amplifier tube Q2; Its essential characteristic be the emitter of comparison amplifier tube Q2 be connected on adjustment pipe Q1 base stage to obtain output voltage signal; Stabilivolt D1 and resistance R 1, R2, R3 form reference voltage circuit, and short-circuit protection diode D2 positive pole is connected on the base stage of comparison amplifier tube Q2, and negative pole is connected on the emitter of adjustment pipe Q1; Utilize the clamping action of diode D2 to realize output short circuit protection, constant current source E1 provides base bias current for the adjustment pipe.
2. a kind of single supply according to claim 1 zero has lied prostrate the accent stabilized power source, and the comparison amplifier tube triode Q2 that it is characterized in that it uses operational amplifier instead and serves as.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120054455 CN202331248U (en) | 2011-02-25 | 2011-02-25 | Power source stabilizing device with one power source and capable of regulating voltage from zero volt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120054455 CN202331248U (en) | 2011-02-25 | 2011-02-25 | Power source stabilizing device with one power source and capable of regulating voltage from zero volt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202331248U true CN202331248U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120054455 Expired - Fee Related CN202331248U (en) | 2011-02-25 | 2011-02-25 | Power source stabilizing device with one power source and capable of regulating voltage from zero volt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202331248U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631301A (en) * | 2012-08-24 | 2014-03-12 | 飞思卡尔半导体公司 | Low dropout voltage regulator with a floating voltage reference |
| CN103838283A (en) * | 2012-11-21 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | Voltage stabilizing circuit |
| WO2020124668A1 (en) * | 2018-12-18 | 2020-06-25 | 深圳市华星光电半导体显示技术有限公司 | Voltage adjustment circuit and voltage adjustment method |
-
2011
- 2011-02-25 CN CN 201120054455 patent/CN202331248U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103631301A (en) * | 2012-08-24 | 2014-03-12 | 飞思卡尔半导体公司 | Low dropout voltage regulator with a floating voltage reference |
| CN103838283A (en) * | 2012-11-21 | 2014-06-04 | 深圳市海洋王照明工程有限公司 | Voltage stabilizing circuit |
| WO2020124668A1 (en) * | 2018-12-18 | 2020-06-25 | 深圳市华星光电半导体显示技术有限公司 | Voltage adjustment circuit and voltage adjustment method |
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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: 20120711 Termination date: 20130225 |