CN206775383U - A kind of power circuit with fictitious load - Google Patents
A kind of power circuit with fictitious load Download PDFInfo
- Publication number
- CN206775383U CN206775383U CN201720471544.5U CN201720471544U CN206775383U CN 206775383 U CN206775383 U CN 206775383U CN 201720471544 U CN201720471544 U CN 201720471544U CN 206775383 U CN206775383 U CN 206775383U
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- transformer
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Abstract
The utility model proposes a kind of power circuit with fictitious load, including the transformer circuit, current rectifying and wave filtering circuit and voltage follower circuit being sequentially connected, described transformer circuit input is connected with applied input voltage end, the described current rectifying and wave filtering circuit of its output end connection, power circuit also includes dummy load circuit, the common junction of the described current rectifying and wave filtering circuit of described dummy load circuit one end connection and described voltage follower circuit, other end ground connection.Implement the power circuit of the technical solution of the utility model, ensure that power supply normally starts, reduce the loss of the energy.
Description
Technical field
A kind of power circuit is the utility model is related to, more particularly to a kind of power circuit with fictitious load.
Background technology
Power supply is to utilize modern power electronics technology, maintains a kind of power supply of regulated output voltage.With power electronics skill
The development and innovation of art so that power technology is also innovated constantly.At present, power supply is with small-sized, light weight and efficient feature
Be widely used almost all of electronic equipment, is that current electronics and information industry develops rapidly a kind of indispensable power supply side
Formula.
Traditional power supply, starting moment, it is quite completely unloaded when voltage does not rise to the operating voltage of load, it can hold
Easily occur not starting, or the phenomenon started repeatedly.In order to overcome this problem, typically all can power output end directly and on
Fictitious load of one resistance as startup.But directly and in the dummy resistance of power output end can continue consumption power,
Influence power supply delivery efficiency, particularly in the unloaded state when, consume the proportion of power with regard to particularly evident.
Utility model content
In order to solve the problems, such as the above, the utility model provides a kind of power circuit with fictitious load and asked to tackle this
Topic.
The utility model discloses a kind of power circuit with fictitious load, including the transformer circuit, whole being sequentially connected
Stream filter circuit and voltage follower circuit, described transformer circuit input are connected with applied input voltage end, and it is exported
The described current rectifying and wave filtering circuit of end connection, described power circuit also include dummy load circuit, described dummy load circuit one end
The common junction of the described current rectifying and wave filtering circuit of connection and voltage follower circuit, other end ground connection.
Further, described transformer circuit includes transformer, and the primary coil of described transformer connects applied voltage,
The secondary coil one of described transformer terminates described current rectifying and wave filtering circuit first input end, the secondary wire of described transformer
Enclose the described input of current rectifying and wave filtering circuit second of other end connection and common ground.
Further, described current rectifying and wave filtering circuit includes:Commutation diode, the first electric capacity, the second electric capacity, the first electric capacity
Commutation diode negative electrode, other end ground connection are connected with one end after the second electric capacity parallel connection, commutation diode anode connects transformer circuit
The first output end.
Further, dummy load circuit includes：Voltage-regulator diode, first resistor, second resistance, 3rd resistor, the 4th electricity
Resistance, the first triode and the second triode, voltage-regulator diode negative electrode and current rectifying and wave filtering circuit and voltage follower circuit common port phase
Even, connect the base stage of the first triode after voltage-regulator diode anode series first resistor and connect with second resistance one end, second
The resistance other end is grounded, 3rd resistor, the 4th resistance common port connection voltage-regulator diode negative electrode, the 3rd resistor other end and first
The base stage common port of the colelctor electrode of triode and the second triode connects, the other end and the second transistor collector of the 4th resistance
Connection, the emitter stage of the first triode are connected with the emitter stage of the second triode and are connected to the ground jointly.
Further, the normal working voltage of described voltage-regulator diode exports just less than described voltage follower circuit
Normal operating voltage, difference are：3~5 volts.
Implement a kind of power circuit with fictitious load of the present utility model, there is technique effect beneficial below：
Implement a kind of power circuit with fictitious load of the technical solution of the utility model, ensure that power supply normally opens
It is dynamic, reduce the loss of the energy.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of the power circuit with fictitious load of embodiment of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, embodiment of the present utility model, a kind of power circuit with fictitious load, including transformer circuit
10 and the current rectifying and wave filtering circuit 20, the voltage follower circuit 30 that are sequentially connected, the input of transformer circuit 10 and additional input electricity
Pressure side is connected, and its output end connection current rectifying and wave filtering circuit 20, power circuit also includes dummy load circuit 40, dummy load circuit 40
One end connects the common junction of current rectifying and wave filtering circuit 20 and voltage follower circuit 30, the other end of dummy load circuit 40 ground connection.
Transformer circuit 10 includes transformer, and the primary coil of transformer connects applied voltage, the secondary coil one of transformer
The described first input end of current rectifying and wave filtering circuit 20 of termination, the secondary coil other end connection current rectifying and wave filtering circuit 20 of transformer the
Two inputs and common ground.
Current rectifying and wave filtering circuit 20 includes:Commutation diode D1, the first electric capacity C1, the second electric capacity C2, the first electric capacity C1 and
One end connects commutation diode D1 negative electrodes, other end ground connection after two electric capacity C2 parallel connections, and commutation diode D1 anodes connect transformer electricity
First output end on road 10.
Dummy load circuit 40 including：Voltage-regulator diode ZD1, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the first triode Q1 and the second triode Q2, voltage-regulator diode ZD1 negative electrodes and current rectifying and wave filtering circuit 20 and voltage output
The common port of circuit 30 is connected, and connects the first triode Q1 base stages after voltage-regulator diode ZD1 anode series first resistors R1, and with
Two resistance R2 one end connect, second resistance R2 other ends ground connection, 3rd resistor R3, the 4th resistance R4 common ports connection voltage stabilizing two pole
Pipe ZD1 negative electrodes, the 3rd resistor R3 other ends and the first triode Q1 colelctor electrode and the second triode Q2 base stage common port connect
Connect, the 4th resistance R4 other end is connected with the second triode Q2 colelctor electrodes, the first triode Q1 emitter stage and the two or three pole
Pipe Q2 emitter stage is connected and is connected to the ground jointly.
Voltage-regulator diode ZD1 normal working voltage is less than the normal working voltage that voltage follower circuit 30 exports, difference
For：3~5 volts.
It is further illustrated below as follows：
One, parameter settings：
Voltage-regulator diode ZD1 is lower 3~5V than the normal voltage of V+ one end in voltage follower circuit 30.
3rd resistor R3 provides base current for the second triode Q2 conductings, and this electric current is generally set in several mA,
And the V+ of V+ one end reaches after normal voltage because the first triode Q1 is turned in voltage follower circuit 30, can be directly coupled to voltage
In output circuit 30 between V+ and ground, therefore 3rd resistor R3 should not be too small.
4th resistance R4 is that the fictitious load in voltage follower circuit 30 between V+ and ground is accessed when starting, and is set according to time demand
It is fixed.
Two, operation principles：
At a kind of power initiation initial stage of power circuit with fictitious load, V+ is not up to the pole of voltage stabilizing two in voltage follower circuit
Before pipe ZD1 cut-in voltage, the first triode Q1 shut-offs, the second triode Q2 conductings.The resistance R4 of fictitious load the 4th accesses power supply
Output end.Ensure that power supply normally starts.
After supply voltage rises above voltage-regulator diode ZD1 voltage of voltage regulation, the first triode Q1 conductings, the second triode Q2
Shut-off.The resistance R4 of fictitious load the 4th is removed, and reduces the loss of power.
Have in practice been verified that, the utility model advantage is：Ensure that power supply normally starts；Reduce energy loss.
Implement a kind of power circuit with fictitious load of the present utility model, there is technique effect beneficial below：
Power initiation initial stage, before voltage follower circuit V+ is not up to voltage-regulator diode ZD1 cut-in voltage, the first triode
Q1 is turned off, the second triode Q2 conductings.The resistance R4 of fictitious load the 4th accesses power output end.Ensure that power supply normally starts.Power supply
After voltage rises above voltage-regulator diode ZD1 voltage of voltage regulation, the first triode Q1 conductings, the second triode Q2 shut-offs.Fictitious load
4th resistance R4 is removed, and reduces the loss of power.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in
Protection domain within.
Claims (5)
1. a kind of power circuit with fictitious load, including the transformer circuit, current rectifying and wave filtering circuit and the voltage that are sequentially connected are defeated
Go out circuit, described transformer circuit input is connected with applied input voltage end, the described rectification filter of its output end connection
Wave circuit, it is characterised in that described power circuit also includes dummy load circuit, described in the connection of described dummy load circuit one end
Current rectifying and wave filtering circuit and voltage follower circuit common junction, the other end ground connection.
2. power circuit according to claim 1, it is characterised in that described transformer circuit includes transformer, described
The primary coil of transformer connect applied voltage, the secondary coil one of described transformer terminates described current rectifying and wave filtering circuit
First input end, the other end of the secondary coil of described transformer connect the described input of current rectifying and wave filtering circuit second and are total to
With ground connection.
3. power circuit according to claim 1, it is characterised in that described current rectifying and wave filtering circuit includes:The pole of rectification two
(D1), the first electric capacity (C1), the second electric capacity (C2) are managed, after described the first electric capacity (C1) is in parallel with described the second electric capacity (C2)
Described commutation diode (D1) negative electrode of one end connection, other end ground connection, described commutation diode (D1) anode connects described
First output end of transformer circuit.
4. power circuit according to claim 1, it is characterised in that described dummy load circuit includes：Voltage-regulator diode
(ZD1), first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the first triode (Q1) and
Two triodes (Q2), described voltage-regulator diode (ZD1) negative electrode and described current rectifying and wave filtering circuit and described voltage output electricity
Road common port is connected, and the first resistor (R1) described in described voltage-regulator diode (ZD1) anode series connects described first afterwards
The base stage of triode (Q1), and connect with described second resistance (R2) one end, described second resistance (R2) other end ground connection,
Described voltage-regulator diode (ZD1) negative electrode of described 3rd resistor (R3), the connection of the 4th resistance (R4) common port, the described the 3rd
Resistance (R3) other end and the colelctor electrode of described the first triode (Q1) and the base stage of described the second triode (Q2) are public
End connection, the other end of the 4th described resistance (R4) are connected with described the second triode (Q2) colelctor electrode, and described first
The emitter stage of triode (Q1) is connected with the emitter stage of described the second triode (Q2) and is connected to the ground jointly.
5. power circuit according to claim 4, it is characterised in that the normal work of described voltage-regulator diode (ZD1)
Voltage is less than the normal working voltage that described voltage follower circuit exports, and difference is：3~5 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720471544.5U CN206775383U (en) | 2017-04-28 | 2017-04-28 | A kind of power circuit with fictitious load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720471544.5U CN206775383U (en) | 2017-04-28 | 2017-04-28 | A kind of power circuit with fictitious load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206775383U true CN206775383U (en) | 2017-12-19 |
Family
ID=60634290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720471544.5U Expired - Fee Related CN206775383U (en) | 2017-04-28 | 2017-04-28 | A kind of power circuit with fictitious load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206775383U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112543532A (en) * | 2020-12-15 | 2021-03-23 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
-
2017
- 2017-04-28 CN CN201720471544.5U patent/CN206775383U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112543532A (en) * | 2020-12-15 | 2021-03-23 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
| CN112543532B (en) * | 2020-12-15 | 2023-09-26 | 上海晶丰明源半导体股份有限公司 | Dimming control circuit and device thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20171219 Termination date: 20200428 |