CN208143109U - A kind of isolation type switching power supply power supply circuit and Switching Power Supply - Google Patents
A kind of isolation type switching power supply power supply circuit and Switching Power Supply Download PDFInfo
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- CN208143109U CN208143109U CN201820626866.7U CN201820626866U CN208143109U CN 208143109 U CN208143109 U CN 208143109U CN 201820626866 U CN201820626866 U CN 201820626866U CN 208143109 U CN208143109 U CN 208143109U
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Abstract
The utility model discloses a kind of isolation type switching power supply power supply circuit and Switching Power Supplies, wherein, the isolation type switching power supply power supply circuit includes main power supply module, auxiliary power module and compensating module, the compensating module is connect with main power supply module and power supply chip, and the auxiliary power module is connect with power supply chip；The main power supply module is used to be load supplying, the auxiliary power module is used to power for power supply chip, the compensating module is used to control main power supply module output compensation electric current when the supply voltage of power supply chip is less than predeterminated voltage to power supply chip, and then guarantees that power supply chip keeps stable state in entire loading range.
Description
Technical field
The utility model relates to power supply technique field, in particular to a kind of isolation type switching power supply power supply circuit and switch electricity
Source.
Background technique
It is typically designed isolation type switching power supply, has one or more main windings and an auxiliary winding.Main winding be to
Load provides energy, and auxiliary winding is to the power supply chip power supply of circuit.Generally when designing circuit, if it is simple with auxiliary around
Group is powered to power supply chip, and when load changes, supply voltage can have greatly changed, or even very low, can make power supply
Chip electricity shortage, auxiliary power supply circuit job insecurity.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a kind of isolation type switching power supplies
Power supply circuit and Switching Power Supply control main power supply module output compensation electric current to electricity using the compensating module in power-supplying circuit
Source chip ensure that power supply chip the operation is stable in entire loading range.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of isolation type switching power supply power supply circuit, including main power supply module, auxiliary power module and compensating module, it is described
Compensating module is connect with main power supply module and power supply chip, and the auxiliary power module is connect with power supply chip；The main power supply
Module is used to be load supplying, and the auxiliary power module is used to power for power supply chip, and the compensating module is for working as power supply
The supply voltage of chip controls main power supply module output compensation electric current to power supply chip when being less than predeterminated voltage.
In the isolation type switching power supply power supply circuit, the compensating module includes current limiting unit and switch unit, institute
It states current limiting unit to connect with main power supply module and switch unit, for the size of compensation electric current to be arranged；The switch unit also with
Power supply chip connection makes main power supply mould for being switched on state when the supply voltage of power supply chip is less than predeterminated voltage
Block output compensates electric current to power supply chip.
In the isolation type switching power supply power supply circuit, the auxiliary power module includes rectification filtering unit and pressure stabilizing
Unit, the rectification filtering unit are connect by voltage regulation unit with power supply chip, and the rectification filtering unit is used to supply auxiliary
Output to voltage regulation unit, the voltage regulation unit is used for rectifying and wave-filtering list after the input voltage of electric module carries out rectifying and wave-filtering processing
The output voltage of member exports supply voltage to power supply chip after carrying out steady pressure treatment.
In the isolation type switching power supply power supply circuit, the current limiting unit includes first resistor, the first resistor
One end connect main power supply module, the other end of the first resistor connects the switch unit.
In the isolation type switching power supply power supply circuit, the switch unit includes second resistance, two pole of the first pressure stabilizing
Pipe and the first triode, one end of one end connection first resistor of the second resistance, the second resistance other end and first
The base stage of triode is all connected with the cathode of the first zener diode, the emitter and the first zener diode of first triode
Anode be all connected with integrated circuit, the other end of the collector connection first resistor of first triode.
In the isolation type switching power supply power supply circuit, the rectification filtering unit includes auxiliary winding, the one or two pole
Pipe and first capacitor, one end of the anode connection auxiliary winding of the first diode, the cathode connection of the first diode
One end of first capacitor and voltage regulation unit, the other end and voltage regulation unit of the other end connection auxiliary winding of the first capacitor.
In the isolation type switching power supply power supply circuit, the voltage regulation unit includes 3rd resistor, two pole of the second pressure stabilizing
Pipe and the second triode, the auxiliary power module further include the second capacitor, and one end of the 3rd resistor connects first capacitor
One end and the second triode collector, the other end of the 3rd resistor connects the cathode and second of the second zener diode
The base stage of triode, the other end of anode connection first capacitor, one end of the second capacitor and the electricity of second zener diode
Source chip, the emitter of second triode connect the other end and power supply chip of the second capacitor.
In the isolation type switching power supply power supply circuit, the main power supply module include main winding, the second diode and
Third capacitor, one end of the anode connection main winding of second diode, the cathode connection third electricity of second diode
One end of appearance and compensating module, the other end of the other end connection main winding of the third capacitor.
A kind of Switching Power Supply, including isolation type switching power supply power supply circuit as described above.
Compared to the prior art, a kind of isolation type switching power supply power supply circuit provided by the utility model and Switching Power Supply,
Wherein, the isolation type switching power supply power supply circuit includes main power supply module, auxiliary power module and compensating module, the compensation
Module is connect with main power supply module and power supply chip, and the auxiliary power module is connect with power supply chip；The main power supply module
For for load supplying, the auxiliary power module to be used to power for power supply chip, and the compensating module is for working as power supply chip
Supply voltage main power supply module output compensation electric current is controlled when being less than predeterminated voltage to power supply chip, and then guarantee power supply chip
Stable state is kept in entire loading range.
Detailed description of the invention
Fig. 1 is the structural block diagram of isolation type switching power supply power supply circuit provided by the utility model.
Fig. 2 is the circuit diagram of isolation type switching power supply power supply circuit provided by the utility model.
Specific embodiment
Isolation type switching power supply power supply circuit provided by the utility model and Switching Power Supply, using in power-supplying circuit
Compensating module controls main power supply module output compensation electric current to power supply chip, ensure that power supply chip is protected in entire loading range
Hold stable state.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
Referring to Fig. 1, isolation type switching power supply power supply circuit provided by the utility model, including it is main power supply module 130, auxiliary
Power supply module 120 and compensating module 110 are helped, the compensating module 110 is connect with main power supply module 130 and power supply chip 140, institute
Auxiliary power module 120 is stated to connect with power supply chip 140；The main power supply module 130 is used to be load supplying, and the auxiliary supplies
Electric module 120 is used to power for power supply chip 140, and the compensating module 110 is used to be less than when the supply voltage of power supply chip 140
The main output of power supply module 130 compensation electric current is controlled when predeterminated voltage to power supply chip 140.
When load stabilization work, so that the supply voltage is stablized, the compensating module 110 remains turned-off shape at this time
State, the main power supply module 130 and auxiliary power module 120 are normally powered respectively for load and power supply chip 140；When load is light
When carrying work, so that the supply voltage is less than predeterminated voltage, the compensating module 110 is connected at this time, controls main power supply module
130 output compensation electric currents so that the supply voltage is stablized, and then guarantee the auxiliary power module 120 to power supply chip 140
It is 140 normal power supply of power supply chip that stable state is kept in entire loading range.
Specifically, referring to Figure 2 together, the compensating module 110 includes current limiting unit 111 and switch unit 112, described
Current limiting unit 111 is connect with main power supply module 130 and switch unit 112, for the size of compensation electric current to be arranged；The switch is single
Member 112 is also connect with power supply chip 140, for the switched conductive shape when the supply voltage of power supply chip 140 is less than predeterminated voltage
State makes the main output of power supply module 130 compensation electric current to power supply chip 140.
When load is lightly loaded work, and supply voltage is less than predeterminated voltage, then the switch unit 112 is connected, and controls main confession
For the electric output of module 130 compensation electric current to power supply chip 140, compensation electricity is then arranged in the current limiting unit 111 connecting with main control module
The size of stream guarantees that the supply voltage still keeps stable.
Further, the auxiliary power module 120 includes rectification filtering unit 121 and voltage regulation unit 122, the rectification
Filter unit 121 is connect by voltage regulation unit 122 with power supply chip 140, and the rectification filtering unit 121 is used for auxiliary power supply
Output to voltage regulation unit 122, the voltage regulation unit 122 is used for whole after the input voltage of module 120 carries out rectifying and wave-filtering processing
Supply voltage is exported to power supply chip 140, the auxiliary power supply mould after flowing the output voltage progress steady pressure treatment of filter unit 121
Block 120 is all powered in entire load for power supply chip 140, and input voltage is filtered place by rectification filtering unit 121
Output to voltage regulation unit 122 carries out steady pressure treatment after reason, to improve the stability of input voltage.
When it is implemented, referring to Fig. 2, the current limiting unit 111 include first resistor R1, the one of the first resistor R1
Even main power supply module 130, the other end of the first resistor R1 connect the switch unit 112, are set by first resistor R1 at end
The size that output compensates electric current to switch unit 112 is set, so that supply voltage is normal, i.e. power supply chip the operation is stable.
Further, the switch unit 112 includes second resistance R2, the first zener diode ZD1 and the first triode
One end of one end connection first resistor R1 of S1, the second resistance R2, the second resistance R2 other end and the first triode
The base stage of S1 is all connected with the cathode of the first zener diode ZD1, two pole of emitter and the first pressure stabilizing of the first triode S1
The anode of pipe ZD1 is all connected with power supply chip 140, the other end of the collector connection first resistor R1 of the first triode S1；
When load is lightly loaded work, supply voltage decline, i.e. voltage at VE fall to the pressure stabilizing value of the first zener diode ZD1 with it is described
When difference between the conduction voltage drop of the first triode S1 emitter junction, the first triode S1 conducting, controls the master at this time
Output compensation electric current, makes the voltage at VE still keep stable at power supply module 130VB, that is, ensure that power supply chip work is steady
It is fixed.In the present embodiment, the conduction voltage drop of the emitter junction of the first triode S1 is 0.7V, i.e., the voltage at VE falls to the
When the pressure stabilizing value of one zener diode ZD1 subtracts 0.7V, the first triode S1 conducting.
Further, the rectification filtering unit 121 includes auxiliary winding N2, first diode D1 and first capacitor
One end of the anode connection auxiliary winding N2 of C1, the first diode D1, the cathode connection first of the first diode D1
One end of capacitor C1 and voltage regulation unit 122, the other end of the other end connection auxiliary winding N2 of the first capacitor C1 and pressure stabilizing
Unit 122 is inputted by 121 Duis of rectification filtering unit of auxiliary winding N2, first diode D1 and first capacitor C1 composition
Output is to voltage regulation unit 122 after voltage is filtered, and guarantees the DC voltage of output smoothing to voltage regulation unit 122.
Further, the voltage regulation unit 122 includes 3rd resistor R3, the second zener diode ZD2 and the two or three pole
Pipe S2, the auxiliary power module 120 further include one end connection first capacitor C1 of the second capacitor C2, the 3rd resistor R3
The collector of one end and the second triode S2, the other end of the 3rd resistor R3 connect the cathode of the second zener diode ZD2
With the base stage of the second triode S2, the other end, the second electricity of the anode connection first capacitor C1 of the second zener diode ZD2
Hold one end and the power supply chip 140 of C2, the emitter of the second triode S2 connects the other end and power supply of the second capacitor C2
Chip 140；Preferably, the pressure stabilizing value of the second zener diode ZD2 described in the present embodiment is more steady than the first zener diode ZD1
Pressure is worth big 0.7V.
When load stabilization work, the supply voltage is stablized, i.e. the voltage stabilization at the place VE, and the voltage at VE is the at this time
Difference between the pressure stabilizing value of two zener diode ZD2 and the conduction voltage drop of the second triode S2 emitter junction, the second triode S2
Conducting, the first triode S1 are not turned on, and the auxiliary power module 120 is normally powered for power supply chip 140；In the present embodiment
The conduction voltage drop of two triode S2 emitter junctions is 0.7V.When load is lightly loaded work, the collector of the second triode S2 is electric at this time
Drops, i.e. voltage decline at VA, then voltage VE at also declines, and the voltage at the VE is two pole of the first pressure stabilizing
When difference between the pressure stabilizing value of pipe ZD1 and the conduction voltage drop of the first triode S1 emitter junction, the first triode S1
Conducting controls output compensation electric current at the main power supply module 130VB, so that the voltage at VE is still kept stable, that is, guarantee
Entire 140 normal power supply of loading range interior power chip；And the voltage regulation unit 122 and third capacitor C3 are to being input to power supply
The supply voltage of chip 140 has carried out steady pressure treatment, and then improves the stability of supply voltage.
The main power supply module 130 includes main winding N1, the second diode D2 and third capacitor C3, second diode
One end of the anode connection main winding N1 of D2, one end of the cathode connection third capacitor C3 of the second diode D2 and compensation mould
Block 110, the other end of the other end connection main winding N1 of the third capacitor C3, so that the main power supply module 130 output is extremely
The voltage of load more smooth steady.
In order to better understand the utility model, below in conjunction with Fig. 1 and Fig. 2 to the isolation type switching power supply of the utility model
The working principle of power supply circuit is described in detail：
When load stabilization work, the supply voltage is stablized, i.e. the voltage stabilization at the place VE, and the voltage at VE is the at this time
Difference between the pressure stabilizing value of two zener diode ZD2 and the conduction voltage drop of the second triode S2 emitter junction, the i.e. voltage of VE are
The pressure stabilizing value of second zener diode ZD2 subtracts 0.7V, and the second triode S2 conducting, the first triode S1 is not turned on, described auxiliary
Power supply module 120 is helped normally to power for power supply chip 140；When load is lightly loaded work, the collector of the second triode S2 at this time
Voltage declines, i.e. voltage decline at VA, then the voltage at the VE also declines, and the voltage at the VE is the first pressure stabilizing two
When difference between the pressure stabilizing value of pole pipe ZD1 and the conduction voltage drop of the first triode S1 emitter junction, first triode
S1 conducting, the place the VB output for controlling the main power supply module 130 compensate electric current to power supply chip 140, make voltage at VE still
It keeps stablizing, therefore guarantees in entire 140 normal power supply of loading range interior power chip.
The utility model further correspondingly provides well a kind of Switching Power Supply, and the Switching Power Supply includes as described above isolated
Switching Power Supply power supply circuit, since the isolation type switching power supply power supply circuit being described in detail above, herein not
It repeats again.
In conclusion isolation type switching power supply power supply circuit provided by the utility model, including main power supply module, auxiliary supply
Electric module and compensating module, the compensating module are connect with main power supply module and power supply chip, the auxiliary power module and electricity
Source chip connection；The main power supply module is used to be load supplying, and the auxiliary power module is used to power for power supply chip, institute
Compensating module is stated for controlling main power supply module output compensation electric current when the supply voltage of power supply chip is less than predeterminated voltage extremely
Power supply chip, and then guarantee that power supply chip keeps stable state in entire loading range.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (9)
1. a kind of isolation type switching power supply power supply circuit, which is characterized in that including main power supply module, auxiliary power module and compensation
Module, the compensating module are connect with main power supply module and power supply chip, and the auxiliary power module is connect with power supply chip；Institute
Main power supply module is stated for for load supplying, the auxiliary power module to be used to power for power supply chip, compensating module use
Electric current is compensated to power supply chip in controlling main power supply module output when the supply voltage of power supply chip is less than predeterminated voltage.
2. isolation type switching power supply power supply circuit according to claim 1, which is characterized in that the compensating module includes limit
Stream unit and switch unit, the current limiting unit are connect with main power supply module and switch unit, for the big of compensation electric current to be arranged
It is small；The switch unit is also connect with power supply chip, for being switched to when the supply voltage of power supply chip is less than predeterminated voltage
On state makes main power supply module output compensation electric current to power supply chip.
3. isolation type switching power supply power supply circuit according to claim 1, which is characterized in that the auxiliary power module packet
Rectification filtering unit and voltage regulation unit are included, the rectification filtering unit is connect by voltage regulation unit with power supply chip, the rectification
Filter unit is used to after carrying out rectifying and wave-filtering processing to the input voltage of auxiliary power module export to voltage regulation unit, the pressure stabilizing
Unit is used to export supply voltage to power supply chip after carrying out steady pressure treatment to the output voltage of rectification filtering unit.
4. isolation type switching power supply power supply circuit according to claim 2, which is characterized in that the current limiting unit includes the
One resistance, one end of the first resistor connect main power supply module, and the other end of the first resistor connects the switch unit.
5. isolation type switching power supply power supply circuit according to claim 4, which is characterized in that the switch unit includes the
Two resistance, the first zener diode and the first triode, one end of one end connection first resistor of the second resistance, described the
The base stage of the two resistance other ends and the first triode is all connected with the cathode of the first zener diode, the transmitting of first triode
The anode of pole and the first zener diode is all connected with integrated circuit, and the collector of first triode connects the another of first resistor
One end.
6. isolation type switching power supply power supply circuit according to claim 3, which is characterized in that the rectification filtering unit packet
Include auxiliary winding, first diode and first capacitor, one end of the anode connection auxiliary winding of the first diode, described the
One end of the cathode connection first capacitor of one diode and voltage regulation unit, the other end connection auxiliary winding of the first capacitor
The other end and voltage regulation unit.
7. isolation type switching power supply power supply circuit according to claim 6, which is characterized in that the voltage regulation unit includes the
Three resistance, the second zener diode and the second triode, the auxiliary power module further include the second capacitor, the 3rd resistor
One end connection first capacitor one end and the second triode collector, the other end of the 3rd resistor connects the second pressure stabilizing
The base stage of the cathode of diode and the second triode, the other end of the anode connection first capacitor of second zener diode,
One end of second capacitor and power supply chip, the emitter of second triode connect the other end and power supply core of the second capacitor
Piece.
8. isolation type switching power supply power supply circuit according to claim 1, which is characterized in that the main power supply module includes
Main winding, the second diode and third capacitor, one end of the anode connection main winding of second diode, the two or two pole
One end of the cathode connection third capacitor of pipe and compensating module, the other end of the other end connection main winding of the third capacitor.
9. a kind of Switching Power Supply, which is characterized in that supplied including the isolation type switching power supply as described in claim 1-8 any one
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820626866.7U CN208143109U (en) | 2018-04-28 | 2018-04-28 | A kind of isolation type switching power supply power supply circuit and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820626866.7U CN208143109U (en) | 2018-04-28 | 2018-04-28 | A kind of isolation type switching power supply power supply circuit and Switching Power Supply |
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| CN208143109U true CN208143109U (en) | 2018-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820626866.7U Active CN208143109U (en) | 2018-04-28 | 2018-04-28 | A kind of isolation type switching power supply power supply circuit and Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
-
2018
- 2018-04-28 CN CN201820626866.7U patent/CN208143109U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995252A (en) * | 2019-04-22 | 2019-07-09 | 合肥惠科金扬科技有限公司 | A kind of voltage regulator circuit and switching power circuit |
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