CN204361903U - Isolation type switch power - Google Patents

Isolation type switch power Download PDF

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Publication number
CN204361903U
CN204361903U CN201420867683.6U CN201420867683U CN204361903U CN 204361903 U CN204361903 U CN 204361903U CN 201420867683 U CN201420867683 U CN 201420867683U CN 204361903 U CN204361903 U CN 204361903U
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Prior art keywords
resistance
circuit
control chip
voltage
type switch
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CN201420867683.6U
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Chinese (zh)
Inventor
张皎
李奇睿
郭瑞成
孟宪文
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CREAT-POREEN POWER ELECTRONICS Co Ltd
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CREAT-POREEN POWER ELECTRONICS Co Ltd
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Abstract

The utility model provides a kind of isolation type switch power, comprises transformer, control chip, start-up circuit and input voltage observation circuit; The armature winding of transformer is configured to connect DC bus, and the secondary winding of transformer is configured to the cascade module connecting high-vol, the feeder ear of the auxiliary winding switching control chip of transformer; Start-up circuit is connected between DC bus and the feeder ear of control chip; The input of input voltage observation circuit is configured to connect DC bus, and the output of input voltage observation circuit is configured to the controller of the cascade module connecting high-vol.Isolation type switch power of the present utility model, can carry out intellectual monitoring to the state of input voltage, improve the reliability of this isolation type switch power; Make control chip be applicable to the occasion of the input voltage of super wide range, extend the scope of application of control chip.

Description

Isolation type switch power
Technical field
The utility model relates to system power supply technical field, particularly relates to a kind of isolation type switch power.
Background technology
The input worked under the application scenario that high voltage and floating potential, wide region input exports isolation type switch power, and the double-transistor flyback formula that adopts topological more, control chip employing UC3844.But the application technology that UC3844 is traditional the application scenario of inapplicable super wide range input voltage.
Utility model content
In view of the present situation of prior art, the purpose of this utility model is to provide a kind of isolation type switch power, makes control chip can be suitable for the occasion of super wide range input voltage, and achieves the intelligent decision of input voltage state.
For achieving the above object, the utility model adopts following technical scheme:
A kind of isolation type switch power, comprises transformer, control chip, start-up circuit and input voltage observation circuit;
The armature winding N1 of described transformer is configured to connect DC bus, and the secondary winding N3 of described transformer is configured to the cascade module connecting high-vol, and the auxiliary winding N2 of described transformer connects the feeder ear of described control chip;
Described start-up circuit is connected between the feeder ear of described DC bus and described control chip; The input of described input voltage observation circuit is configured to connect described DC bus, and the output of described input voltage observation circuit is configured to the controller of the cascade module connecting described high-vol.
Wherein in an embodiment, described start-up circuit comprises the first transistor Q1, transistor seconds Q2, the first resistance R1 and the second resistance R2;
The described second resistance R2 of described first resistance R1 series connection forms the first bleeder circuit, and described first bleeder circuit is connected between described DC bus and ground wire;
Be configured to connect described DC bus after first resistance R1 described in the drain series of described the first transistor Q1, the gate pole of described the first transistor Q1 connects the collector electrode of described transistor seconds Q2, and the source electrode of described the first transistor Q1 connects the feeder ear of described control chip;
The base stage of described transistor seconds Q2 connects the 4th pin of described control chip, the grounded emitter of described transistor seconds Q2.
Wherein in an embodiment, described start-up circuit also comprises the 3rd resistance R3 and the 4th resistance R4 that are arranged in series;
Described 3rd resistance R3 and described 3rd resistance R4 forms the second bleeder circuit, and described second bleeder circuit is connected between the feeder ear of described DC bus and described control chip;
The gate pole of described the first transistor Q1 and the collector electrode of described transistor seconds Q2 are all connected to the corresponding common port of described 3rd resistance R3 and described 4th resistance R4.
Wherein in an embodiment, described start-up circuit also comprises the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2;
The negative electrode of described first voltage-stabiliser tube D1 connects the gate pole of described the first transistor Q1, connects the feeder ear of described control chip after the described second voltage-stabiliser tube D2 of anode series connection of described first voltage-stabiliser tube D1.
Wherein in an embodiment, described input voltage observation circuit comprises the first electric voltage observation circuit and the second electric voltage observation circuit;
Described first electric voltage observation circuit is connected between described DC bus and ground wire, and described second electric voltage observation circuit and described first electric voltage observation circuit are arranged in parallel.
Wherein in an embodiment, described first electric voltage observation circuit comprises the 7th resistance R7, the 8th resistance R8, the first transient diode T1 and the first optical coupler OC1;
The negative electrode of described first transient diode T1 is connected after the described 8th resistance R8 of described 7th resistance R7 series connection, the anode of described first transient diode T1 connects the input of described first optical coupler OC1, and the output of described first optical coupler OC1 is configured to the cascade module controller connecting described high-vol.
Wherein in an embodiment, described second electric voltage observation circuit comprises the 9th resistance R9, the tenth resistance R10, the second transient diode T2 and the second optical coupler OC2;
The negative electrode of described second transient diode T2 is connected after the described tenth resistance R10 of described 9th resistance R9 series connection, the anode of described second transient diode T2 connects the input of described second optical coupler OC2, and the output of described second optical coupler OC2 is configured to the cascade module controller connecting described high-vol.
Wherein in an embodiment, the puncture voltage of described first transient diode T1 is greater than the puncture voltage of described second transient diode T2.
The beneficial effects of the utility model are:
Isolation type switch power of the present utility model, by arranging input voltage observation circuit, can carry out intellectual monitoring to the state of input voltage, improve the reliability of this isolation type switch power; By the improvement to start-up circuit, make control chip be applicable to the occasion of the input voltage of super wide range, extend the scope of application of control chip.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of isolation type switch power one embodiment of the present utility model;
Fig. 2 is the circuit diagram of start-up circuit one embodiment of control chip in isolation type switch power of the present utility model;
Fig. 3 is the circuit theory diagrams of the first electric voltage observation circuit one embodiment in isolation type switch power of the present utility model;
Fig. 4 is the circuit theory diagrams of the second electric voltage observation circuit one embodiment in isolation type switch power of the present utility model;
Fig. 5 is the output waveform figure of input voltage observation circuit in isolation type switch power of the present utility model.
Embodiment
In order to make the technical solution of the utility model clearly, below in conjunction with accompanying drawing, isolation type switch power of the present utility model is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the utility model and to be not used in restriction the utility model.
Shown in Figure 1, isolation type switch power of the present utility model, comprise transformer 1, control chip 3, start-up circuit 2, input voltage observation circuit 4 and double-transistor flyback formula circuit, double-transistor flyback formula circuit is connected between control chip 3 and transformer 1.Wherein, control chip 3 adopts UC3844.Transformer 1 comprises armature winding N1, auxiliary winding N2 and secondary winding N3, and the armature winding N1 of transformer 1 is configured to connect DC bus, and the secondary winding N3 of transformer 1 is configured to the cascade module connecting high-vol.The auxiliary winding N2 of transformer 1 is connected to the feeder ear of control chip 3, and namely the auxiliary winding N2 of transformer 1 is connected to the 7th pin of UC3844, for the power supply of control chip 3.
Start-up circuit 2 is connected between the feeder ear of DC bus and control chip 3, and the isolation type switch power of the present embodiment, by improving start-up circuit, makes control chip 3 can be applicable to the situation of relative broad range input voltage.The input of input voltage observation circuit 4 is configured to connect DC bus, and for monitoring the state of DC bus-bar voltage, the output of input voltage observation circuit 4 is configured to the controller of the cascade module connecting high-vol.By carrying out intellectual monitoring to the state of DC bus-bar voltage, the controller of the cascade module of high-vol can by the status adjustment start-up circuit of DC bus-bar voltage, ensure the normal operation of control chip, further increase the reliability of this isolation type switch power.
As a kind of embodiment, as shown in Figure 2, start-up circuit 2 comprises the first transistor Q1, transistor seconds Q2, the first resistance R1 and the second resistance R2.Wherein, the first resistance R1 second resistance R2 that connects forms the first bleeder circuit, and the first bleeder circuit is connected between DC bus and ground wire, and the first bleeder circuit is used for the supply power voltage of regulable control chip 3.The first transistor Q1 is preferably the MOS transistor of N raceway groove, and transistor seconds Q2 is preferably bipolar npn transistor.
DC bus is connected to after the drain series first resistance R1 of the first transistor Q1, namely the drain electrode of the first transistor Q1 is connected to the corresponding common port of the first resistance R1 and the second resistance R2, first resistance R1 is used for the supply current of regulable control chip 3, prevents the supply current of control chip 3 excessive and causes burning of control chip 3.The gate pole of the first transistor Q1 is connected to the collector electrode of transistor seconds Q2, and the source electrode of the first transistor Q1 is connected to the feeder ear of control chip 3, is namely connected to the 7th pin of control chip 3.The base stage of transistor seconds Q2 is connected to the 4th pin of control chip 3, the grounded emitter of transistor seconds Q2.
After the first transistor Q1 conducting, DC bus is powered to control chip by the first resistance R1.Due in the H bridge cascade structure of high-vol, the current potential of each cascade module is in high potential, and the current potential of each cascade module is different, and therefore, the working range of DC bus is wider.When the magnitude of voltage Vin of DC bus exceedes the operating voltage range of control chip 3, by regulating the voltage ratio of the first resistance R1 and the second resistance R2, control chip can be made still can normally to work under the occasion of wide-range input voltage.
More preferably, start-up circuit 2 also comprises the 3rd resistance R3 and the 4th resistance R4.3rd resistance R3 series connection the 4th resistance R4 forms the second bleeder circuit, and the second bleeder circuit is connected between the feeder ear of DC bus and control chip 3.3rd resistance R3 and the 3rd resistance R4, as starting resistance, determines DC bus and when is starting control chip.The drain electrode of the first transistor Q1 and the collector electrode of transistor seconds Q2 are all connected to the corresponding common port of the 3rd resistance R3 and the 4th resistance R4.
This start-up circuit 2 also comprises the 5th resistance R5 and the 6th resistance R6,5th resistance R5 is connected between the base stage of transistor seconds Q2 and the emitter of transistor seconds Q2, and the 6th resistance R6 is connected between the base stage of transistor seconds Q2 and the 4th pin of control chip 3.
Start-up circuit also comprises the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2; The negative electrode of the first voltage-stabiliser tube D1 is connected to the gate pole of the first transistor Q1, and the anode of the first voltage-stabiliser tube D1 is connected and is connected to the feeder ear of control chip after the second voltage-stabiliser tube D2.First voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2, for the protection of the gate pole of the first transistor Q1, prevents gate pole peak voltage or the gate pole of electrostatic to the first transistor Q1 from causing damage.
The course of work of the start-up circuit of the present embodiment is as follows:
When DC bus-bar voltage Vin reaches certain value, trigger the first transistor Q1 by the dividing potential drop of the 3rd resistance R3 and the 4th resistance R4.After the first transistor Q1 conducting, DC bus is powered to the feeder ear of control chip 3 by the first resistance R1 and the first transistor Q1.After control chip 3 starts, the 4th pin of control chip 3 exports high level Vf, by transistor seconds Q2 conducting.After transistor seconds Q2 conducting, the first transistor Q1 turns off, and is powered to control chip 3 by the auxiliary winding N2 of transformer 1.
As a kind of embodiment, input voltage observation circuit 4 comprises the first electric voltage observation circuit and the second electric voltage observation circuit; First electric voltage observation circuit is connected between DC bus and ground wire, and the second electric voltage observation circuit and the first electric voltage observation circuit are arranged in parallel.
As shown in Figure 3, the first electric voltage observation circuit comprises the 7th resistance R7, the 8th resistance R8, the first transient diode T1 and the first optical coupler OC1; The negative electrode of the first transient diode T1 is connected to after 7th resistance R7 series connection the 8th resistance R8, the anode of the first transient diode T1 connects the input of the first optical coupler OC1, and the output of the first optical coupler OC1 is configured to the cascade module controller connecting high-vol.The output of the first optical coupler OC1 is for exporting the first voltage V1, and the first voltage V1 can be used for the cascade module controller of high-vol to use.
As shown in Figure 4, the second electric voltage observation circuit comprises the 9th resistance R9, the tenth resistance R10, the second transient diode T2 and the second optical coupler OC2; The negative electrode of the second transient diode T2 is connected to after 9th resistance R9 series connection the tenth resistance R10, the anode of the second transient diode T2 connects the input of the second optical coupler OC2, and the output of the second optical coupler OC2 is configured to the cascade module controller connecting high-vol.The output of the second optical coupler OC2 is for exporting the second voltage V2, and the second voltage V2 can be used for the cascade module controller of high-vol to use.
The first optical coupler OC1 in the present embodiment and the second optical coupler OC2 all adopts the optical coupler with high current transfer ratio, can reduce the loss of input voltage observation circuit so greatly.Because optical coupler has the characteristic of one-way transmission signal, therefore, the electrical isolation between the input of input voltage observation circuit and output is achieved by employing optical coupler.And the output signal V1 of the first optical coupler OC1 and the output signal V2 of the second optical coupler OC2 can be used for the controller of the cascade module of high-vol to use.
More preferably, the puncture voltage of the first transient diode T1 is greater than the puncture voltage of the second transient diode T2.The breakdown voltage value of the first transient diode T1 and the second transient diode T2 is set as different values, by the breakdown voltage value of adjustment first transient diode T1 and the second transient diode T2, the monitoring threshold of input voltage observation circuit can be set flexibly.In other embodiments, can be the puncture voltage that the puncture voltage of the first transient diode T1 is less than the second transient diode T2.
In the present embodiment, the puncture voltage of the first transient diode T1 is set as H, the puncture voltage of the second transient diode T2 is set as L, and H > L, then the operation principle of this input voltage observation circuit is as follows:
When the puncture voltage of DC bus-bar voltage Vin higher than the first transient diode T1, namely during Vin > H, the first voltage V1 of the output of the first optical coupler C1 is low level, and the second voltage V2 that the second optical coupler C2 exports also is low level.
When the puncture voltage of DC bus-bar voltage Vin lower than the second transient diode T2, namely during Vin < L, the first voltage V1 that the first optical coupler C1 exports is low level, and the second voltage V2 that the second optical coupler C2 exports also is low level.
When the puncture voltage of DC bus-bar voltage Vin higher than the puncture voltage of the second transient diode T2 and lower than the first transient diode T1, namely during L < Vin < H, the first voltage V1 that first optical coupler C1 exports is high level, and the second voltage V2 that the second optical coupler C2 exports is low level.
As shown in Figure 5, the state of DC bus-bar voltage can be judged from the output waveform of this input voltage observation circuit.During A section, the first voltage V1, the second voltage V2 are low level, and Vin > H is described.During B section, the first voltage V1, the second voltage V2 are high level, and Vin < L is described.During C section, the first voltage V1 is high level, and the second voltage V2 is low level, and L < Vin < H is described.
Isolation type switch power of the present utility model, by arranging input voltage observation circuit, can carry out intellectual monitoring to the state of input voltage, improve the reliability of this isolation type switch power; By arranging start-up circuit, control chip can be made to be applicable to the occasion of the input voltage of super wide range, to extend the scope of application of control chip.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims (8)

1. an isolation type switch power, is characterized in that, comprises transformer, control chip, start-up circuit and input voltage observation circuit;
The armature winding N1 of described transformer is configured to connect DC bus, and the secondary winding N3 of described transformer is configured to the cascade module connecting high-vol, and the auxiliary winding N2 of described transformer connects the feeder ear of described control chip;
Described start-up circuit is connected between the feeder ear of described DC bus and described control chip; The input of described input voltage observation circuit is configured to connect described DC bus, and the output of described input voltage observation circuit is configured to the controller of the cascade module connecting described high-vol.
2. isolation type switch power according to claim 1, is characterized in that, described start-up circuit comprises the first transistor Q1, transistor seconds Q2, the first resistance R1 and the second resistance R2;
The described second resistance R2 of described first resistance R1 series connection forms the first bleeder circuit, and described first bleeder circuit is connected between described DC bus and ground wire;
Be configured to connect described DC bus after first resistance R1 described in the drain series of described the first transistor Q1, the gate pole of described the first transistor Q1 connects the collector electrode of described transistor seconds Q2, and the source electrode of described the first transistor Q1 connects the feeder ear of described control chip;
The base stage of described transistor seconds Q2 connects the 4th pin of described control chip, the grounded emitter of described transistor seconds Q2.
3. isolation type switch power according to claim 2, is characterized in that, described start-up circuit also comprises the 3rd resistance R3 and the 4th resistance R4 that are arranged in series;
Described 3rd resistance R3 and described 3rd resistance R4 forms the second bleeder circuit, and described second bleeder circuit is connected between the feeder ear of described DC bus and described control chip;
The gate pole of described the first transistor Q1 and the collector electrode of described transistor seconds Q2 are all connected to the corresponding common port of described 3rd resistance R3 and described 4th resistance R4.
4. isolation type switch power according to claim 2, is characterized in that, described start-up circuit also comprises the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2;
The negative electrode of described first voltage-stabiliser tube D1 connects the gate pole of described the first transistor Q1, connects the feeder ear of described control chip after the described second voltage-stabiliser tube D2 of anode series connection of described first voltage-stabiliser tube D1.
5. isolation type switch power according to claim 1, is characterized in that, described input voltage observation circuit comprises the first electric voltage observation circuit and the second electric voltage observation circuit;
Described first electric voltage observation circuit is connected between described DC bus and ground wire, and described second electric voltage observation circuit and described first electric voltage observation circuit are arranged in parallel.
6. isolation type switch power according to claim 5, is characterized in that, described first electric voltage observation circuit comprises the 7th resistance R7, the 8th resistance R8, the first transient diode T1 and the first optical coupler OC1;
The negative electrode of described first transient diode T1 is connected after the described 8th resistance R8 of described 7th resistance R7 series connection, the anode of described first transient diode T1 connects the input of described first optical coupler OC1, and the output of described first optical coupler OC1 is configured to the cascade module controller connecting described high-vol.
7. isolation type switch power according to claim 6, is characterized in that, described second electric voltage observation circuit comprises the 9th resistance R9, the tenth resistance R10, the second transient diode T2 and the second optical coupler OC2;
The negative electrode of described second transient diode T2 is connected after the described tenth resistance R10 of described 9th resistance R9 series connection, the anode of described second transient diode T2 connects the input of described second optical coupler OC2, and the output of described second optical coupler OC2 is configured to the cascade module controller connecting described high-vol.
8. isolation type switch power according to claim 7, is characterized in that, the puncture voltage of described first transient diode T1 is greater than the puncture voltage of described second transient diode T2.
CN201420867683.6U 2014-12-31 2014-12-31 Isolation type switch power Active CN204361903U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107508458A (en) * 2017-09-28 2017-12-22 广州中逸光电子科技有限公司 A kind of start-up circuit of super wide voltage accessory power supply PWM chip

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107508458A (en) * 2017-09-28 2017-12-22 广州中逸光电子科技有限公司 A kind of start-up circuit of super wide voltage accessory power supply PWM chip
CN107508458B (en) * 2017-09-28 2021-11-12 广州中逸光电子科技有限公司 Starting circuit of PWM chip of ultra-wide voltage auxiliary power supply

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