CN201274022Y - Voltage stabilization negative feedback circuit - Google Patents
Voltage stabilization negative feedback circuit Download PDFInfo
- Publication number
- CN201274022Y CN201274022Y CNU2008200999843U CN200820099984U CN201274022Y CN 201274022 Y CN201274022 Y CN 201274022Y CN U2008200999843 U CNU2008200999843 U CN U2008200999843U CN 200820099984 U CN200820099984 U CN 200820099984U CN 201274022 Y CN201274022 Y CN 201274022Y
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- voltage
- module
- resistance
- triode
- voltage stabilizing
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- 230000006641 stabilisation Effects 0.000 title 1
- 238000011105 stabilization Methods 0.000 title 1
- 230000000087 stabilizing effect Effects 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 102220015875 rs6734111 Human genes 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model relates to a steady voltage negative feedback circuit, include that commercial alternating voltage to the input carries out the step-down module (1) that steps down, carry out rectifier filter module (2) of rectifier filter and voltage-stabilizing module (3) to the voltage of rectifier filter module output to the alternating voltage of step-down module output, wherein voltage-stabilizing module (3) include triode Q11, stabilivolt ZD1 and resistance R13, resistance R13 is connected between triode Q11's base and collecting electrode, triode Q11's base passes through stabilivolt ZD1 ground connection, a serial connection resistance R14 between the output of rectifier filter module (2) and the input of voltage-stabilizing module (3). The utility model has the advantages that: the voltage at the two ends of the collector and the emitter of the triode is reduced by utilizing the voltage division effect of the resistor R14, so that the temperature rise of the triode is reduced, and the reliability of the circuit is improved.
Description
Technical field
The utility model relates to a kind of voltage stabilizing negative-feedback circuit, belongs to the improvement technology of voltage stabilizing negative-feedback circuit.
Background technology
The electric product that more and more has computer control enters in people's the life gradually, as computermatic electric cooker etc.For control center's IC chip of giving product provides stable low-voltage dc power supply, the general a kind of typical tandem type voltage stabilizing negative-feedback circuit that adopts as shown in Figure 1: city's alternating voltage is exported 5V voltage of direct-flow voltage regulation V then successively by step-down module 1, rectification filtering module 2 and Voltage stabilizing module 3
DD1Give peripheral circuit or the IC of control center chips such as LED light, button loop, triode switch (not shown).
But in the application of reality, owing to varying in size of load in the peripheral circuit, the collector and emitter both end voltage Vce that causes triode Q11 is than higher, thereby it is more serious to cause triode Q11 to generate heat, and has influenced the reliability of circuit greatly.
The utility model content
The purpose of this utility model is at the problems referred to above, provides a kind of and can effectively reduce transistor collector and emitter both end voltage, thus the temperature rise of reduction triode, the voltage stabilizing negative-feedback circuit of raising circuit reliability.
The purpose of this utility model is realized by following technical proposals.
The utility model comprises that the city's alternating voltage to input carries out the step-down module of step-down, the alternating voltage of step-down module output is carried out the rectification filtering module of rectifying and wave-filtering and the Voltage stabilizing module that the voltage of rectification filtering module output is carried out voltage stabilizing, wherein Voltage stabilizing module comprises triode Q11, stabilivolt ZD1 and resistance R 13, resistance R 13 is connected between the base stage and collector of triode Q11, the base stage of triode Q11 is connected in series with resistance R 14 by stabilivolt ZD1 ground connection between the output terminal of described rectification filtering module and the input end of Voltage stabilizing module.
The Standard resistance range of described resistance R 13 is 360 Ω～1.5k Ω, and the Standard resistance range of resistance R 14 is 100 Ω～30 Ω.
The beneficial effects of the utility model are: owing to utilize the dividing potential drop effect of resistance R 14, reduced the voltage at transistor collector and emitter two ends, thereby reduced the temperature rise of triode, improved circuit reliability.
Description of drawings
Fig. 1 is the voltage stabilizing negative-feedback circuit figure of prior art;
Fig. 2 is voltage stabilizing negative-feedback circuit figure of the present utility model.
Embodiment
As shown in Figure 2, voltage stabilizing negative-feedback circuit of the present utility model comprises fuse FUSE, step-down module 1, rectification filtering module 2 and the Voltage stabilizing module 3 that is electrically connected successively with city's AC supply voltage.Step-down module 1 comprises voltage dependent resistor (VDR) ZR1, capacitor C 11 and the transformer T1 that is connected in parallel, and is connected on the two ends of transformer T1 primary winding after voltage dependent resistor (VDR) ZR1, capacitor C 11 parallel connections; Rectification filtering module 2 comprises rectifier bridge, capacitor C 12 and the capacitor C of being made up of diode D11, D12, D13, D14 13, and rectifier bridge, capacitor C 12 and capacitor C 13 are connected in parallel, and two of the secondary coil of transformer T1 terminates at the two ends of rectifier bridge; Voltage stabilizing module 3 comprises triode Q11, stabilivolt ZD1 and resistance R 13, resistance R 13 is connected between the base stage and collector of triode Q11, the collector of resistance R 14 1 termination triode Q11, the output terminal of another termination rectifier bridge, the emission of triode Q11 is the output terminal of voltage stabilizing negative-feedback circuit very, and the base stage of triode Q11 is by stabilivolt ZD1 ground connection.
During circuit working, city's AC supply voltage is reduced to the alternating voltage of 10.5V after fuse FUSE, step-down module 1, carry out the DC voltage that rectification, filtering obtain 12V through rectification filtering module 2 again, obtain the DC voltage Vdd1 of 5V then through Voltage stabilizing module 3, offer peripheral circuit or the IC of control center chips such as LED light, button loop, triode switch (not shown); 14 couples of triode Q11 of the resistance R collector that is connected in series between rectification filtering module 2 and the Voltage stabilizing module 3 carries out dividing potential drop with the voltage that emission collects two ends, avoids the serious problem of triode Q11 temperature rise that causes because of load difference in the peripheral circuit.
In order to make the utility model reach gratifying effect, the resistance of resistance R 14 is selected to satisfy such two requirements: the electric current I that 1, guarantees to flow through stabilivolt ZD1
ZIn its power requirement scope; 2, under various different loads situations, guarantee R14 dividing potential drop maximum and the stable output of 5V voltage as far as possible simultaneously; 3, establishing load current is I
L, stabilivolt ZD1 both end voltage is U
Z, the resistance of R13 and R14 is chosen and is satisfied following formula:
I
Z*R13+U
Z+(I
L+I
Z)*R14＝12
Realize effect preferably, the desirable Standard resistance range of resistance R 13 is 360 Ω～1.5k Ω, and is corresponding, and the resistance of resistance R 14 is 100 Ω～30 Ω.
In the present embodiment, stabilivolt ZD1 both end voltage U
ZBe 5.6V, the resistance of resistance R 13 is 360 Ω, and the resistance of resistance R 14 is 100 Ω.
Claims (2)
1, a kind of voltage stabilizing negative-feedback circuit, comprise the step-down module (1) that city's alternating voltage of importing is carried out step-down, the alternating voltage of step-down module output is carried out the rectification filtering module (2) of rectifying and wave-filtering and the Voltage stabilizing module (3) that the voltage of rectification filtering module output is carried out voltage stabilizing, wherein Voltage stabilizing module (3) comprises triode Q11, stabilivolt ZD1 and resistance R 13, resistance R 13 is connected between the base stage and collector of triode Q11, the base stage of triode Q11 is by stabilivolt ZD1 ground connection, it is characterized in that being connected in series with resistance R 14 between the input end of the output terminal of described rectification filtering module (2) and Voltage stabilizing module (3).
2, voltage stabilizing negative-feedback circuit according to claim 1, the Standard resistance range that it is characterized in that described resistance R 13 are 360 Ω～1.5k Ω, and the Standard resistance range of resistance R 14 is 100 Ω～30 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200999843U CN201274022Y (en) | 2008-09-09 | 2008-09-09 | Voltage stabilization negative feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200999843U CN201274022Y (en) | 2008-09-09 | 2008-09-09 | Voltage stabilization negative feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201274022Y true CN201274022Y (en) | 2009-07-15 |
Family
ID=40884365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200999843U Expired - Lifetime CN201274022Y (en) | 2008-09-09 | 2008-09-09 | Voltage stabilization negative feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201274022Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609127B (en) * | 2009-07-24 | 2012-12-05 | 美的集团有限公司 | Relay fault detection circuit |
-
2008
- 2008-09-09 CN CNU2008200999843U patent/CN201274022Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609127B (en) * | 2009-07-24 | 2012-12-05 | 美的集团有限公司 | Relay fault detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING Free format text: FORMER OWNER: MEIDI GROUP CO. LTD. Effective date: 20120417 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120417 Address after: Beijiao Town, Shunde District of Guangdong city of Foshan province Sanle road 528311 No. 19 Patentee after: FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING Co.,Ltd. Address before: 528311 Foshan, Shunde District, Beijiao Town, Penglai Road, the United States Industrial City Patentee before: Midea Group |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090715 |
|
| CX01 | Expiry of patent term |