CN205302070U - D.C. regulated power supply with duplicate protection circuit - Google Patents
D.C. regulated power supply with duplicate protection circuit Download PDFInfo
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- CN205302070U CN205302070U CN201521085241.7U CN201521085241U CN205302070U CN 205302070 U CN205302070 U CN 205302070U CN 201521085241 U CN201521085241 U CN 201521085241U CN 205302070 U CN205302070 U CN 205302070U
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Abstract
(B, ) the utility model discloses a (B, ) (b) D. C. Regulated power supply with duplicate protection circuit, it includes first voltage sampling circuit (1), a reference voltage (U1), second voltage sampling circuit (2), the 2nd reference voltage (U2), comparison amplifier (3), compensating pipe (4) and protection circuit (5). (B, ) (b) the utility model discloses having higher precision, can the self -starting recovering, had the own withstand voltage restriction that nice and warm overload duplicate protection and output voltage range did not receive the adjusting element, the security is high, is a relatively more practical circuit. (B, )
Description
Technical field
This utility model relates to a kind of D.C. regulated power supply, especially a kind of D.C. regulated power supply with dual-protection circuit.
Background technology
D.C. regulated power supply needs overload protection measures, and conventional mainly has two classes: a class is current-limiting type, has the type such as diode, crystal triode, and shortcoming is to adjust pipe pipe consumption greatly; Another is off type; having the types such as transistor, controllable silicon, bistable circuit, shortcoming is self-starting to recover, and bistable circuit needs could start by recovery button; also needing to additionally add overheating protection circuit and reach duplicate protection effect together with overload protection, structure is more complicated.
Utility model content
Technical problem to be solved in the utility model be in that to provide a kind of simple in construction, can the D.C. regulated power supply with dual-protection circuit that recovers of self-starting.
For solving above-mentioned technical problem, the technical solution of the utility model is as follows:
A kind of D.C. regulated power supply with dual-protection circuit, including the first voltage sample circuit, the first reference voltage, the second voltage sample circuit, the second reference voltage, comparison amplifier, adjustment pipe and protection circuit, first voltage sample circuit and the first reference voltage connect comparison amplifier, the second voltage sample circuit and the second reference voltage and connect protection circuit; Comparison amplifier and protection circuit connect to adjust manages, and adjusts pipe and connects output voltage, output voltage parallel resistance.
The above-mentioned D.C. regulated power supply with dual-protection circuit, specifically, it includes accessory power supply, filter circuit, differential comparison amplifying circuit, sample circuit, reference voltage, adjustment pipe, overheating protection circuit and current foldback circuit, accessory power supply is made up of two diodes and an electric capacity, electric capacity is in parallel with voltage input end, two Diode series; Filter circuit is made up of a capacitor, differential comparison amplifying circuit is made up of two transistors in parallel, adjust pipe to be made up of three audions being cascaded, reference voltage is made up of three diodes, sample circuit is made up of two resistance and a potentiometer, overheating protection circuit is made up of two temperature-sensitive audions, three critesistor and a thermal diode, two temperature-sensitive audion series connection; Current foldback circuit is made up of a transistor, and the base stage of this transistor is in parallel with two resistance and a zener diode, a sampling protective resistance of connecting between the b-e pole of this transistor.
In the aforesaid D.C. regulated power supply with dual-protection circuit, it is preferred that small-power selected by two audions of described adjustment pipe, and amplification is the NPN transistor of �� 2, and another audion is selected high-power, and amplification is the NPN transistor of �� 1.
Beneficial effect: compared with prior art, this utility model simple in construction, there is higher precision; self-starting can recover, there is overheated and overload duplicate protection, and output voltage range is not by the own pressure restriction adjusting element; safety is high, is a kind of practical circuit.
Accompanying drawing explanation
Fig. 1 is functional-block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Below in conjunction with the drawings and specific embodiments, this utility model is further described.
Detailed description of the invention
As it is shown in figure 1, include first voltage sample circuit the 1, first reference voltage U
1
, second voltage sample circuit the 2, second reference voltage U
2
, comparison amplifier 3, adjust pipe 4 and protection circuit 5, the first voltage sample circuit 1 and the first reference voltage U
1
Connect comparison amplifier 3, the second voltage sample circuit 2 and the second reference voltage U
2
Connect protection circuit 5; Comparison amplifier 3 and protection circuit 5 connect adjustment pipe 4, adjust pipe 4 and connect output voltage U
0
, input terminal voltage is U
i
, output voltage U
0
Parallel resistance R
0
��
Operation principle: when output electric current is in specified scope, the voltage taken from loop due to the second voltage sample circuit 2 and the second reference voltage U
2
Difference in voltage less than protection circuit 5 startup voltage, so protection circuit 5 inoperative; Now line voltage or load current change and cause output voltage U
0
During fluctuation, by the sampling voltage of the first voltage sample circuit 1 and the first reference voltage U
1
Relatively, its difference, after comparison amplifier 3 amplifies, compensates output voltage U by changing the voltage adjusting pipe 4 two ends
0
Change, make circuit tend towards stability. When exporting current overload or during output circuit short circuit, the voltage taken from loop due to the second voltage sample circuit 2 and the second reference voltage U
2
Difference more than protection circuit 5 startup voltage; protection circuit overloads protection is started working; now feed back to the electric current overwhelming majority adjusting pipe 4 through comparison amplifier 3 by protecting circuit 5 to flow away; return the electric current adjusting pipe 4 minimum; the base potential adjusting pipe 4 falls too low; the dynamic internal resistance of regulated power supply increases, and adjusts pipe 4 and enters cut-off state, output voltage U
0
Reduce to zero or close to zero. Rework when load circuit recovers circuit after normally. When working long hours, adjusting pipe 4 element such as grade can temperature rise, it is possible to the shunting being exchanged homogeneous tube 4 by overheating protection circuit makes output electric current reduce, and manostat power consumption is restricted, and chip temperature is limited in certain temperature range, protects chip and is not crossed cause thermal damage.
Specific embodiment is as shown in Figure 2, including accessory power supply, filter circuit, differential comparison amplifying circuit, sample circuit, reference voltage, adjustment pipe, overheating protection circuit and current foldback circuit, input is step-down transformer U, by diode D1, diode D2 and electric capacity C1 forms two voltage doubling rectifying circuit as accessory power supply, circuit structure is fairly simple, and electric capacity C1 is in parallel with voltage input end, and diode D1 connects with diode D2; Filter circuit is made up of common low frequency aluminium electrolutic capacitor C2, is used for filtering alternating component, and the electric current making output is smoother.Differential comparison amplifying circuit is made up of the significantly high transistor Q5 of two in parallel amplifications and transistor Q6, so can improve sensitivity and the stability of circuit, adjusting pipe to be made up of the audion Q1 being cascaded, audion Q2 and audion Q3, audion Q1 and audion Q2 selects two small-powers, and amplification is the NPN transistor of �� 2, audion Q3 selection one is high-power, amplification is the NPN transistor of �� 1, such multiple tube is obtained in that significantly high amplification �� �� �� 1 �� 2 �� 2, therefore adjust pipe to have only to only small input current and just can obtain bigger output electric current, access a small capacitances in multiple tube base stage simultaneously, prevent pulse load electric current from causing the fluctuation of output voltage, it is possible to reduce the ripple voltage of output voltage. diode D4 is the reference voltage compared with differential amplifier circuit, and diode D3 is the reference voltage of protection circuit, and diode D5 is the reference voltage of accessory power supply, sample circuit is made up of resistance R8, resistance R10 and a potentiometer R4 so that the voltage of output can be transferred in smaller scope, overheating protection circuit is by temperature-sensitive audion Q7, temperature-sensitive audion Q8, critesistor R14, critesistor R15, critesistor R16 and thermal diode D6 composition, temperature-sensitive audion Q7 connects with temperature-sensitive audion Q8, critesistor R14 connects with thermal diode D6, temperature-sensitive audion Q8 cut-off when temperature is normal, when temperature is raised to a limit value, semistor R16 resistance increases, pressure drop increases, and the BE of negative temperature coefficient heat-sensitive audion Q8 ties forward voltage drop and declines, so that temperature-sensitive audion Q8 conducting is exchanged homogeneous tube and is tapped, output electric current reduces, manostat power consumption is restricted, chip temperature is defined in certain limit, protect chip and do not crossed cause thermal damage. current foldback circuit is made up of transistor Q4, and the base stage of transistor Q4 is in parallel with resistance R6, resistance R7 and zener diode D3, and connect between the b-e pole of transistor Q4 a sampling protective resistance R5. before normal circuit operation, first the resistance of potentiometer R4 is transferred to maximum, is then turn on circuit, then regulator potentiometer makes the voltage between b, the e pole of transistor Q4 be zero. when input current exceedes certain value, the base potential of transistor Q4 raises, cut-off state time normal become conducting, and the base voltage so adjusting pipe declines, and internal resistance increases accordingly, so that overcurrent declines and is fixed on below a certain numerical value, when load current recovers normal, transistor Q4 automatically restores to normal cut-off state, and circuit recovers normal automatically.
Embodiment of the present utility model is not limited to above-described embodiment, and the various changes made under the premise without departing from this utility model objective belong within protection domain of the present utility model.
Claims (3)
1. with a D.C. regulated power supply for dual-protection circuit, including the first voltage sample circuit (1), the first reference voltage (U1), the second voltage sample circuit (2), the second reference voltage (U2), comparison amplifier (3), adjust pipe (4) and protect circuit (5), it is characterised in that: the first voltage sample circuit (1) and the first reference voltage (U1) connect comparison amplifier (3), the second voltage sample circuit (2) and the second reference voltage (U2) connect protection circuit (5); Comparison amplifier (3) and protection circuit (5) connect to adjust manages (4), adjusts pipe (4) and connects output voltage (U0), output voltage (U0) parallel resistance (R0).
2. the D.C. regulated power supply with dual-protection circuit according to claim 1, it is characterized in that: include accessory power supply, filter circuit, differential comparison amplifying circuit, sample circuit, reference voltage, adjustment pipe, overheating protection circuit and current foldback circuit, accessory power supply is by diode D1, diode D2 and electric capacity C1 composition, electric capacity C1 is in parallel with voltage input end, and diode D1 connects with diode D2, filtered electrical routing capacitor C2 is constituted, differential comparison amplifying circuit is made up of transistor Q5 in parallel and transistor Q6, adjust pipe by the audion Q1 being cascaded, audion Q2 and audion Q3 composition, reference voltage is by diode D3, diode D4 and diode D5 composition, sample circuit is by resistance R8, resistance R10 and a potentiometer R4 composition, overheating protection circuit is by temperature-sensitive audion Q7, temperature-sensitive audion Q8, critesistor R14, critesistor R15, critesistor R16 and thermal diode D6 composition, temperature-sensitive audion Q7 connects with temperature-sensitive audion Q8, critesistor R14 connects with thermal diode D6, current foldback circuit is made up of transistor Q4, and the base stage of transistor Q4 is in parallel with resistance R6, resistance R7 and zener diode D3, and connect between the b-e pole of transistor Q4 a sampling protective resistance R5.
3. the D.C. regulated power supply with dual-protection circuit according to claim 2, it is characterised in that: the audion Q1 and audion Q2 of described adjustment pipe selects small-power, and amplification is the NPN transistor of �� 2; Audion Q3 selects high-power, and amplification is the NPN transistor of �� 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521085241.7U CN205302070U (en) | 2015-12-24 | 2015-12-24 | D.C. regulated power supply with duplicate protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521085241.7U CN205302070U (en) | 2015-12-24 | 2015-12-24 | D.C. regulated power supply with duplicate protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205302070U true CN205302070U (en) | 2016-06-08 |
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ID=56472206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521085241.7U Expired - Fee Related CN205302070U (en) | 2015-12-24 | 2015-12-24 | D.C. regulated power supply with duplicate protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205302070U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625817A (en) * | 2021-08-03 | 2021-11-09 | 无锡天和电子有限公司 | Three-terminal fixed positive output voltage regulator and manufacturing method thereof |
| CN113659855A (en) * | 2021-08-05 | 2021-11-16 | 深圳市合科泰电子有限公司 | DC diode voltage-stabilized power supply circuit with rectification and protection circuit |
-
2015
- 2015-12-24 CN CN201521085241.7U patent/CN205302070U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113625817A (en) * | 2021-08-03 | 2021-11-09 | 无锡天和电子有限公司 | Three-terminal fixed positive output voltage regulator and manufacturing method thereof |
| CN113659855A (en) * | 2021-08-05 | 2021-11-16 | 深圳市合科泰电子有限公司 | DC diode voltage-stabilized power supply circuit with rectification and protection circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20161224 |