CN207265865U - A kind of inverse-excitation type switch power-supply circuit - Google Patents
A kind of inverse-excitation type switch power-supply circuit Download PDFInfo
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Abstract
The utility model proposes a kind of inverse-excitation type switch power-supply circuit, including main output circuit, reference source circuit, isolation circuit and switching power source control circuit, further include：Soft starting circuit, soft starting circuit include the first diode, first resistor and the first capacitance；The anode of first diode is connected with the isolation circuit, and the cathode of the first diode connects the supply voltage of the main output circuit by the first resistor, and one end of the first capacitance is connected with the cathode of the first diode, other end ground connection.The utility model proposes inverse-excitation type switch power-supply circuit, can solve the problems, such as that inverse-excitation type switch power-supply can not start when input voltage is relatively low.
Description
Technical field
It the utility model is related to switch power technology field, and in particular to a kind of inverse-excitation type switch power-supply circuit.
Background technology
Inverse-excitation type switch power-supply, by the switch motion of switching power source chip, the electric current of the primary change of high frequency transformer is led to
A secondary for being delivered to high frequency transformer or multiple secondary are crossed, main output loop has corresponding a reference source to carry out voltage stabilizing, but
With the curent change of main output loop, voltage also occurs to change accordingly, and at this moment the feedback circuit of main output loop becomes this
Change feeds back to switching power source chip.And the curent change of other output loops also influences whether the voltage change of main output loop,
The voltage change can equally feed back to switching power source chip.Switching power source chip adjusts defeated according to the feedback signal of voltage change
The waveform gone out, including the adjustment of duty cycle or the adjustment of frequency, and then make the voltage of main output loop opposite to change before
Direction change, ensure output loop output stability.
However, when input voltage is relatively low, energy that the switch motion of switching power source chip passes through high frequency transformer transmission
Than relatively low, so that the voltage of main output loop output is also than relatively low, the abnormal signal of feedback loop, or even backfeed loop is not
Work, switching power source chip will stop output switching signal, and cause Switching Power Supply not start.
Utility model content
In view of above-mentioned analysis, the utility model proposes a kind of inverse-excitation type switch power-supply circuit, to solve when input
The problem of inverse-excitation type switch power-supply can not start when voltage is relatively low.
To achieve the above object, the utility model adopts the following technical solution：
The utility model proposes a kind of inverse-excitation type switch power-supply circuit, including main output circuit, reference source circuit, isolation
Circuit and switching power source control circuit, further include：Soft starting circuit, the soft starting circuit include the first diode, first
Resistance and the first capacitance；The anode of first diode is connected with the isolation circuit, the cathode of first diode
The supply voltage of the main output circuit, one end of first capacitance and the one or two pole are connected by the first resistor
The cathode of pipe is connected, other end ground connection.
In one embodiment, the soft starting circuit further includes the second diode, the anode connection of second diode
The cathode of first diode, the cathode of second diode connect the supply voltage of the main output circuit.
In one embodiment, the main output circuit includes rectifier diode, inductance and the second capacitance to the 4th capacitance；
The cathode of the rectifier diode passes through the inductance connection supply voltage；Second capacitance is parallel to switching mode power supply transformer
Secondary coil both ends, and one end of second capacitance be connected to the cathode of the rectifier diode and the inductance it
Between；3rd capacitance is in parallel with second capacitance, a termination supply voltage of the 3rd capacitance, other end ground connection；Described
Four capacitances are connected in parallel on the 3rd capacitance both ends.
In one embodiment, the isolation circuit includes photoelectrical coupler and second resistance, and the photoelectrical coupler includes
Light emitting diode and phototriode；The collector of the phototriode connects the PWM cores of the switching power source control circuit
The feedback end of piece, the emitter ground connection of the phototriode；The anode of the light emitting diode connects institute by second resistance
The cathode of rectifier diode is stated, the cathode of the light emitting diode connects the anode of first diode.
In one embodiment, the reference source circuit includes the 5th capacitance, reference voltage source and 3rd resistor to the 6th
Resistance；One end of 5th capacitance connects the cathode of the light emitting diode, and the other end passes through the 4th resistance and the 5th resistance
Connect the supply voltage of the main output circuit, the second pin ground connection of the reference voltage source, the of the reference voltage source
One pin connects the cathode of the light emitting diode, and the 3rd pin of the reference voltage source is connected to the 4th resistance and the
Between five resistance, the 3rd resistor is connected in parallel on the both ends of the light emitting diode, and the 6th resistor coupled in parallel is in the benchmark
In the second pin of voltage source and the 3rd pin.
Technical solutions of the utility model, have the following advantages that：
The utility model proposes a kind of inverse-excitation type switch power-supply circuit, including main output circuit, reference source circuit, isolation
Circuit and switching power source control circuit, further include：Soft starting circuit, the soft starting circuit include the first diode, first
Resistance and the first capacitance；The anode of first diode is connected with the isolation circuit, the cathode of first diode
The supply voltage of the main output circuit, one end of first capacitance and the one or two pole are connected by the first resistor
The cathode of pipe is connected, other end ground connection.The utility model proposes inverse-excitation type switch power-supply circuit, can solve to work as input voltage
The problem of inverse-excitation type switch power-supply can not start when relatively low.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, describe below
In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the schematic diagram of a specific example of inverse-excitation type switch power-supply circuit in the utility model embodiment；
Fig. 2 is the schematic diagram of another specific example of inverse-excitation type switch power-supply circuit in the utility model embodiment.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, sheet
Field those of ordinary skill all other embodiments obtained without making creative work, belong to this practicality
Novel protected scope.
, it is necessary to which explanation, term " first ", " second ", " the 3rd " etc. are only used for retouching in the description of the utility model
Purpose is stated, and it is not intended that instruction or hint relative importance.
, it is necessary to illustrate in the description of the utility model, unless otherwise clearly defined and limited, term " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be with
It is the connection inside two elements, can is wireless connection or wired connection.For those of ordinary skill in the art
For, concrete meaning of the above-mentioned term in the utility model can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not forming conflict can be combined with each other.
The utility model proposes a kind of inverse-excitation type switch power-supply circuit, including main output circuit, reference source circuit, isolation
Circuit and switching power source control circuit, further include：Soft starting circuit.As shown in Figure 1, the soft starting circuit includes the one or two pole
Pipe D1, first resistor R1 and the first capacitance C1；The anode of first diode D1 is connected with isolation circuit, the first diode D1's
Cathode passes through the supply voltage VCC of the main output circuit of first resistor R1 connections, one end of the first capacitance C1 and the first diode D1
Cathode be connected, the other end ground connection GND.
The utility model proposes inverse-excitation type switch power-supply circuit, the soft starting circuit is simple, and cost is low, reliable operation,
The startup voltage of inverse-excitation type switch power-supply is reduced, has widened the input voltage range of inverse-excitation type switch power-supply, can solve to work as
The problem of inverse-excitation type switch power-supply can not start when input voltage is relatively low.
As shown in Fig. 2, above-mentioned soft starting circuit further includes the second diode D2, the anode connection of second diode D2 the
The cathode of one diode D1, the cathode of second diode D2 connect the supply voltage VCC of main output circuit.
As shown in Fig. 2, above-mentioned main output circuit includes rectifier diode D3, inductance L and the second capacitance C2 to the 4th electricity
Hold C4；The cathode of rectifier diode D3 passes through inductance L connection supply voltages VCC；Second capacitance C2 is parallel to Switching Power Supply transformation
The both ends of the secondary coil of device, and one end of the second capacitance C2 is connected between the cathode of rectifier diode D3 and inductance L；3rd
Capacitance C3 is in parallel with the second capacitance C2, a termination supply voltage VCC of the 3rd capacitance C3, other end ground connection GND；4th capacitance C4
It is connected in parallel on the 3rd capacitance C3 both ends.
As shown in Fig. 2, above-mentioned isolation circuit includes photoelectrical coupler OPC and second resistance R2, photoelectrical coupler OPC includes
Light emitting diode D and phototriode PT；The PWM chip of the collector connecting valve power control circuit of phototriode PT
The emitter ground connection GND of feedback end FB, phototriode PT；The anode of light emitting diode D passes through second resistance R2 connection rectifications
The cathode of diode D3, the cathode of light emitting diode D connect the anode of the first diode D1.
As shown in Fig. 2, said reference source circuit includes the 5th capacitance C5, reference voltage source RVS and 3rd resistor R3 extremely
6th resistance R6；The cathode of one end connecting luminous diode D of 5th capacitance C5, the other end pass through the electricity of the 4th resistance R4 and the 5th
The supply voltage VCC of the main output circuit of R5 connections is hindered, the second pin of reference voltage source RVS is grounded, and the of reference voltage source RVS
The cathode of one pin connecting luminous diode D, the 3rd pin of reference voltage source RVS are connected to the 4th resistance R4 and the 5th resistance
Between R5,3rd resistor R3 is connected in parallel on the both ends of light emitting diode D, and the 6th resistance R6 is connected in parallel on the second of reference voltage source RVS
On pin and the 3rd pin.
The operation principle of the inverse-excitation type switch power-supply circuit proposed below to the utility model embodiment illustrates：
When not adding soft starting circuit, when Switching Power Supply just powered on and input voltage than it is relatively low when, main output voltage ratio
It is relatively low, reference voltage source RVS because cannot get enough voltage and cisco unity malfunction, the output of reference voltage source RVS are relatively low, from
And the backfeed loop cisco unity malfunction collectively constituted by second resistance R2, light emitting diode D and reference voltage source RVS, feedback
Signal is weaker, and the soft start inside the PWM chip of switching power source control circuit stops because cannot get feedback signal, whole anti-
Excitation type switch power-supply circuit can not work normally.
After adding soft starting circuit, by second resistance R2, light emitting diode D, the first diode D1 and the first capacitance C1 groups
Into backfeed loop, in firm powered on moment, at this moment the first capacitor C1 has electric current to flow through light emitting diode D equivalent to short-circuit condition,
Feedback signal Normal Feedback improves main output to switching power source control circuit, Switching Power Supply adjusting switch frequency or duty cycle
Output voltage loop, since the RC charging circuits time constant of second resistance R2 and the first capacitance C1 are very short, the first capacitance C1 is very
It is fast fully charged, while the voltage on reference voltage source RVS rises to normal working voltage level, reference voltage source RVS outputs
By on the voltage stabilization of major loop to default voltage, inverse-excitation type switch power-supply normally starts benchmark, by second resistance R2, shines
The backfeed loop of diode D and reference voltage source RVS compositions also works normally.
The inverse-excitation type switch power-supply circuit that the utility model embodiment provides, due to the first diode in soft starting circuit
D1 is anti-reverse diode, and soft starting circuit only plays the role of startup when inverse-excitation type switch power-supply circuit just powers on, and flyback
After formula switching power circuit normally starts, first resistor R1 in soft starting circuit and the first capacitance C1 composition charge-discharge circuits and
It is changed into filter circuit, the high frequency ripple of main output loop when playing the role of reducing normal work, and due to the second diode D2
Presence so that after Switching Power Supply power down, the electric charge on the first capacitance C1 can quickly be bled off, for next inverse-excitation type switch power-supply
Startup prepare.
Obviously, the above embodiments are merely examples for clarifying the description, and the restriction not to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the scope of protection of the utility model.
Claims (5)
1. a kind of inverse-excitation type switch power-supply circuit, including main output circuit, reference source circuit, isolation circuit and Switching Power Supply control
Circuit processed, it is characterised in that further include：Soft starting circuit,
The soft starting circuit includes the first diode (D1), first resistor (R1) and the first capacitance (C1)；
The anode of first diode (D1) is connected with the isolation circuit, and the cathode of first diode (D1) passes through institute
State the supply voltage (VCC) that first resistor (R1) connects the main output circuit, one end of first capacitance (C1) with it is described
The cathode of first diode (D1) is connected, other end ground connection (GND).
2. inverse-excitation type switch power-supply circuit according to claim 1, it is characterised in that the soft starting circuit further includes
Two diodes (D2), the cathode of anode connection first diode (D1) of second diode (D2), the described 2nd 2
The cathode of pole pipe (D2) connects the supply voltage (VCC) of the main output circuit.
3. inverse-excitation type switch power-supply circuit according to claim 1 or 2, it is characterised in that the main output circuit includes
Rectifier diode (D3), inductance (L) and the second capacitance (C2) are to the 4th capacitance (C4)；
The cathode of the rectifier diode (D3) connects supply voltage (VCC) by the inductance (L)；Second capacitance (C2)
The both ends of the secondary coil of switching mode power supply transformer are parallel to, and one end of second capacitance (C2) is connected to the rectification two
Between the cathode and the inductance (L) of pole pipe (D3)；3rd capacitance (C3) is in parallel with second capacitance (C2), the 3rd electricity
Hold a termination supply voltage (VCC) of (C3), other end ground connection (GND)；4th capacitance (C4) is connected in parallel on the 3rd electricity
Hold (C3) both ends.
4. inverse-excitation type switch power-supply circuit according to claim 3, it is characterised in that the isolation circuit includes photoelectricity coupling
Clutch (OPC) and second resistance (R2), the photoelectrical coupler (OPC) include light emitting diode (D) and phototriode (PT)；
The collector of the phototriode (PT) connects the feedback end (FB) of the PWM chip of the switching power source control circuit,
The emitter ground connection (GND) of the phototriode (PT)；
The anode of the light emitting diode (D) connects the cathode of the rectifier diode (D3) by second resistance (R2), described
The cathode of light emitting diode (D) connects the anode of first diode (D1).
5. inverse-excitation type switch power-supply circuit according to claim 4, it is characterised in that the reference source circuit includes the 5th
Capacitance (C5), reference voltage source (RVS) and 3rd resistor (R3) are to the 6th resistance (R6)；
One end of 5th capacitance (C5) connects the cathode of the light emitting diode (D), and the other end passes through the 4th resistance (R4)
The supply voltage (VCC) of the main output circuit, the second pin of the reference voltage source (RVS) are connected with the 5th resistance (R5)
Ground connection, the first pin of the reference voltage source (RVS) connect the cathode of the light emitting diode (D), the reference voltage source
(RVS) the 3rd pin is connected between the 4th resistance (R4) and the 5th resistance (R5), and the 3rd resistor (R3) is in parallel
At the both ends of the light emitting diode (D), the 6th resistance (R6) is connected in parallel on the second pin of the reference voltage source (RVS)
With on the 3rd pin.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721395286.3U CN207265865U (en) | 2017-10-25 | 2017-10-25 | A kind of inverse-excitation type switch power-supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721395286.3U CN207265865U (en) | 2017-10-25 | 2017-10-25 | A kind of inverse-excitation type switch power-supply circuit |
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| CN207265865U true CN207265865U (en) | 2018-04-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509968A (en) * | 2020-04-28 | 2020-08-07 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
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- 2017-10-25 CN CN201721395286.3U patent/CN207265865U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509968A (en) * | 2020-04-28 | 2020-08-07 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Address before: 325603 Wenzhou Daqiao Industrial Park, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. |
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