CN203799290U - Current expanding circuit of three-terminal integrated voltage stabilizer - Google Patents
Current expanding circuit of three-terminal integrated voltage stabilizer Download PDFInfo
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- CN203799290U CN203799290U CN201420100880.5U CN201420100880U CN203799290U CN 203799290 U CN203799290 U CN 203799290U CN 201420100880 U CN201420100880 U CN 201420100880U CN 203799290 U CN203799290 U CN 203799290U
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- voltage stabilizer
- terminal integrated
- integrated voltage
- current
- circuit
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Abstract
The utility model discloses a current expanding circuit of a three-terminal integrated voltage stabilizer. The current expanding circuit comprises a current regulative diode current expanding circuit body and a three-terminal integrated voltage stabilizer circuit, the current regulative diode current expanding circuit body comprises a CRD, an adjustable precision shunt regulator DZ, a triode T and an adjustable precision potentiometer RW, the three-terminal integrated voltage stabilizer circuit comprises a capacitor C1, a capacitor C2 and the three-terminal integrated voltage stabilizer CW78XX, and the current regulative diode current expanding circuit body is connected with the three-terminal integrated voltage stabilizer circuit. According to the current expanding circuit of the three-terminal integrated voltage stabilizer, the CRD, the adjustable precision shunt regulator and the adjustable precision potentiometer are added, stable current expanding currents can be provided, adjustment can be carried out according to load changes, the three-terminal integrated voltage stabilizer is protected, the three-terminal integrated voltage stabilizer is prevented from being damaged, and the circuit is simple and convenient to adjust.
Description
Technical field
The utility model relates to a kind of three terminal integrated voltage stabilizer and expands current circuit, belongs to applications of electronic circuitry technical field.
Background technology
Three terminal integrated voltage stabilizer is widely used in various electronic products and equipment, when load current is greater than the output current of three terminal integrated voltage stabilizer, often adopt the expansion current circuit shown in Fig. 1, as shown in Figure 1, output current IO is three terminal integrated voltage stabilizer CW78XX output current IXX and triode T collector output current IC sum, because varying with temperature, the current amplification factor of triode changes, and triode T collector output current IC changes with current amplification factor, when temperature declines, triode current amplification factor declines, triode T collector output current IC diminishes thereupon, due to three terminal integrated voltage stabilizer output voltage U, O is constant, in the situation that load RL is constant, output current IO is constant, diminishing of triode T collector output current lC must make three terminal integrated voltage stabilizer CW78XX output current IXX become large, the damage of three terminal integrated voltage stabilizer CW78XX will be caused, expansion current circuit shown in Fig. 1 cannot carry out electric current adjustment according to the variation of load simultaneously, use inconvenient.
Utility model content
The problem existing for prior art, the utility model proposes a kind of when temperature diminishes, the impregnable three terminal integrated voltage stabilizer of three terminal integrated voltage stabilizer output current expands current circuit, avoided the damage of three terminal integrated voltage stabilizer CW78XX, circuit also can carry out the adjustment of electric current according to the variation of load simultaneously, easy to use.
The technical solution adopted in the utility model is:
Comprise that a current regulator diode expands current circuit, a three terminal integrated voltage stabilizer circuit, current regulator diode expands current circuit and is connected with three terminal integrated voltage stabilizer circuit.
Described current regulator diode expands current circuit and comprises current regulator diode CRD, adjustable precision shunt regulator DZ, triode T, adjustable precision potentiometer RW, the collector of the anode of current regulator diode CRD and triode T, the anode of input voltage UI, the upper end of three terminal integrated voltage stabilizer circuit capacitance C1, the 1 pin tandem of three terminal integrated voltage stabilizer CW78XX, the negative electrode tandem of the negative electrode of the base stage of triode T and current regulator diode CRD and adjustable precision shunt regulator DZ, the center tap (left end) of the emitter of triode T and adjustable precision potentiometer RW joins, the anode of the right-hand member of adjustable precision potentiometer RW and adjustable precision shunt regulator DZ, 2 pin of three terminal integrated voltage stabilizer CW78XX, the upper end of three terminal integrated voltage stabilizer circuit capacitance C2, the upper end tandem of load RL.
Described three terminal integrated voltage stabilizer circuit comprises capacitor C 1, C2, three terminal integrated voltage stabilizer CW78XX, pull-up resistor RL, 1 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 1, the anode of current regulator diode CRD, the collector of triode T, the anode tandem of input voltage UI, 3 pin of three terminal integrated voltage stabilizer CW78XX and ground tandem, 2 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 2, the right-hand member of adjustable precision potentiometer RW, the anode of adjustable precision shunt regulator DZ, the upper end of capacitor C 2, the upper end tandem of pull-up resistor RL, capacitor C 1, C2, the lower end of pull-up resistor RL and ground tandem, on pull-up resistor RL, obtain output voltage U 0.
The utility model three terminal integrated voltage stabilizer expands current circuit; by the current regulator diode, adjustable precision shunt regulator and the adjustable precision potentiometer that increase; with respect to background technology; stable expansion stream electric current can be provided and can adjust according to load variations; protected three terminal integrated voltage stabilizer; avoided the damage of three terminal integrated voltage stabilizer, circuit is simple, easy to adjust.
Accompanying drawing explanation
Fig. 1 is that the conventional three terminal integrated voltage stabilizer of the utility model background technology expands current circuit.
Fig. 2 is that the utility model three terminal integrated voltage stabilizer expands current circuit.
Embodiment
Fig. 2 is that the utility model three terminal integrated voltage stabilizer expands current circuit, comprises that a current regulator diode expands current circuit, a three terminal integrated voltage stabilizer circuit, and current regulator diode expands current circuit and is connected with three terminal integrated voltage stabilizer circuit.
Current regulator diode expands current circuit and comprises current regulator diode CRD, adjustable precision shunt regulator DZ, triode T, adjustable precision potentiometer RW, the collector of the anode of current regulator diode CRD and triode T, the anode of input voltage UI, the upper end of three terminal integrated voltage stabilizer circuit capacitance C1, the 1 pin tandem of three terminal integrated voltage stabilizer CW78XX, the negative electrode tandem of the negative electrode of the base stage of triode T and current regulator diode CRD and adjustable precision shunt regulator DZ, the center tap (left end) of the emitter of triode T and adjustable precision potentiometer RW joins, the anode of the right-hand member of adjustable precision potentiometer RW and adjustable precision shunt regulator DZ, 2 pin of three terminal integrated voltage stabilizer CW78XX, the upper end of three terminal integrated voltage stabilizer circuit capacitance C2, the upper end tandem of load RL.
Three terminal integrated voltage stabilizer circuit comprises capacitor C 1, C2, three terminal integrated voltage stabilizer CW78XX, pull-up resistor RL, 1 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 1, the anode of current regulator diode CRD, the collector of triode T, the anode tandem of input voltage UI, 3 pin of three terminal integrated voltage stabilizer CW78XX and ground tandem, 2 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 2, the right-hand member of adjustable precision potentiometer RW, the anode of adjustable precision shunt regulator DZ, the upper end of capacitor C 2, the upper end tandem of pull-up resistor RL, capacitor C 1, C2, the lower end of pull-up resistor RL and ground tandem, on pull-up resistor RL, obtain output voltage U 0.
Implementation process of the present utility model is:
As shown in Figure 2, after powering on, the electric current I CRD that flows through current regulator diode CRD is constant, because triode T base current is very little, the electric current that flows through adjustable precision shunt regulator DZ is approximately constant ICRD, and being adjustable precision shunt regulator DZ voltage stabilizing value, adjustable precision potentiometer RW both end voltage deducts triode T emitter junction forward voltage, because triode T emitter junction forward voltage is far smaller than adjustable precision shunt regulator DZ voltage stabilizing value, therefore flow through the electric current of adjustable precision potentiometer RW, be approximately adjustable precision shunt regulator DZ voltage stabilizing value divided by the value of adjustable precision potentiometer RW, electric current is IR as shown in the figure, because adjustable precision shunt regulator DZ voltage stabilizing value stabilization is high, the electric current that flows through adjustable precision potentiometer RW is stable electric current I R, stable electric current I R and steady current ICRD be synthetic obtains stable output current IC, the output current obtaining on load RL is that current regulator diode expands current circuit output current IC and three terminal integrated voltage stabilizer output current IXX sum, on the basis of original three terminal integrated voltage stabilizer output current IXX, obtained expanding stream, when temperature declines, current regulator diode expands current circuit output current IC and keeps constant, can not make three terminal integrated voltage stabilizer output current IXX become large, avoided the damage of three terminal integrated voltage stabilizer, when load changes, can be by regulating the size of adjustable precision potentiometer RW, change the size that current regulator diode expands current circuit output current lC, thereby adjusted the size that three terminal integrated voltage stabilizer expands current circuit output current.
Above-mentioned embodiment is used for explaining the utility model; rather than the utility model is limited; in the protection domain of spirit of the present utility model and claim, any modification and change that the utility model is made, all fall in protection domain of the present utility model.
Claims (3)
1. three terminal integrated voltage stabilizer expands a current circuit, it is characterized in that: comprise that a current regulator diode expands current circuit, a three terminal integrated voltage stabilizer circuit, current regulator diode expands current circuit and is connected with three terminal integrated voltage stabilizer circuit.
2. three terminal integrated voltage stabilizer according to claim 1 expands current circuit, it is characterized in that: described current regulator diode expands current circuit and comprises current regulator diode CRD, adjustable precision shunt regulator DZ, triode T, adjustable precision potentiometer RW, the collector of the anode of current regulator diode CRD and triode T, the anode of input voltage UI, the upper end of three terminal integrated voltage stabilizer circuit capacitance C1, the 1 pin tandem of three terminal integrated voltage stabilizer CW78XX, the negative electrode tandem of the negative electrode of the base stage of triode T and current regulator diode CRD and adjustable precision shunt regulator DZ, the center tap (left end) of the emitter of triode T and adjustable precision potentiometer RW joins, the anode of the right-hand member of adjustable precision potentiometer RW and adjustable precision shunt regulator DZ, 2 pin of three terminal integrated voltage stabilizer CW78XX, the upper end of three terminal integrated voltage stabilizer circuit capacitance C2, the upper end tandem of load RL.
3. three terminal integrated voltage stabilizer according to claim 1 expands current circuit, it is characterized in that: described three terminal integrated voltage stabilizer circuit comprises capacitor C 1, C2, three terminal integrated voltage stabilizer CW78XX, pull-up resistor RL, 1 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 1, the anode of current regulator diode CRD, the collector of triode T, the anode tandem of input voltage UI, 3 pin of three terminal integrated voltage stabilizer CW78XX and ground tandem, 2 pin of three terminal integrated voltage stabilizer CW78XX and the upper end of capacitor C 2, the right-hand member of adjustable precision potentiometer RW, the anode of adjustable precision shunt regulator DZ, the upper end of capacitor C 2, the upper end tandem of pull-up resistor RL, capacitor C 1, C2, the lower end of pull-up resistor RL and ground tandem, on pull-up resistor RL, obtain output voltage U 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420100880.5U CN203799290U (en) | 2014-02-26 | 2014-02-26 | Current expanding circuit of three-terminal integrated voltage stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420100880.5U CN203799290U (en) | 2014-02-26 | 2014-02-26 | Current expanding circuit of three-terminal integrated voltage stabilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203799290U true CN203799290U (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420100880.5U Expired - Fee Related CN203799290U (en) | 2014-02-26 | 2014-02-26 | Current expanding circuit of three-terminal integrated voltage stabilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203799290U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104699165A (en) * | 2015-03-31 | 2015-06-10 | 航天科技控股集团股份有限公司 | Three-terminal voltage regulator chip-based power supply circuit |
| CN105652948A (en) * | 2014-11-17 | 2016-06-08 | 上海岭芯微电子有限公司 | LDO external expansion circuit and method for manufacturing LDO external expansion structure thereof |
| CN106469933A (en) * | 2015-08-05 | 2017-03-01 | 江苏爱福特科技开发有限公司 | A kind of battery charger |
| CN115793770A (en) * | 2023-02-07 | 2023-03-14 | 杭州长川科技股份有限公司 | Current expansion device, power supply board card and automatic test equipment |
-
2014
- 2014-02-26 CN CN201420100880.5U patent/CN203799290U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652948A (en) * | 2014-11-17 | 2016-06-08 | 上海岭芯微电子有限公司 | LDO external expansion circuit and method for manufacturing LDO external expansion structure thereof |
| CN104699165A (en) * | 2015-03-31 | 2015-06-10 | 航天科技控股集团股份有限公司 | Three-terminal voltage regulator chip-based power supply circuit |
| CN106469933A (en) * | 2015-08-05 | 2017-03-01 | 江苏爱福特科技开发有限公司 | A kind of battery charger |
| CN115793770A (en) * | 2023-02-07 | 2023-03-14 | 杭州长川科技股份有限公司 | Current expansion device, power supply board card and automatic test equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20150226 |
|
| EXPY | Termination of patent right or utility model |