CN208971373U - Switching power source control circuit and Switching Power Supply - Google Patents
Switching power source control circuit and Switching Power Supply Download PDFInfo
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- CN208971373U CN208971373U CN201821596099.6U CN201821596099U CN208971373U CN 208971373 U CN208971373 U CN 208971373U CN 201821596099 U CN201821596099 U CN 201821596099U CN 208971373 U CN208971373 U CN 208971373U
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Abstract
The utility model discloses a kind of switching power source control circuit and Switching Power Supplies, the switching power source control circuit is after the completion of auxiliary switch pipe afterflow, Switching Power Supply main switch is opened in delay at the first time, according to auxiliary switch pipe time of afterflow and reference time, it adjusts inductive current peak or/and adjusts at the first time, so that control switch electric power output voltage is predeterminated voltage.The utility model is while control switch electric power output voltage is constant, circuit is simple, peripheral components are less, do not need sampling and outputting voltage and output voltage setting is flexible, the peripheral circuits such as optocoupler are not needed in isolation type switching power supply, and the information transmission on the former secondary side of isolation type switching power supply can be realized.
Description
Technical field
The utility model relates to a kind of power electronics field, in particular to a kind of switching power source control circuit and switch
Power supply.
Background technique
The application that Switching Power Supply exports Isobarically Control is especially extensive.Such as in intelligent dimming field, the output of Switching Power Supply
In load other than LED, often contain such as other communication modules of wireless module/bluetooth module.As shown in Figure 1, Switching Power Supply
Output end vo ut is connected with LED, while by linear voltage regulator, connecting rear class communication module (being indicated in Fig. 1 with R1).In LED
When work, the power supply of rear class communication module is easy to accomplish；When LED is standby, it is contemplated that power problems need Switching Power Supply
Output one is much smaller than the constant pressure of lamp pressure drop, Lai Shixian communication module normal power supply.
The prior art utilizes the difference of collected output voltage and reference voltage by the output voltage of acquisition Switching Power Supply
It is worth closed loop and adjusts output voltage, so that output voltage maintains the size of reference voltage, thus realize voltage close loop control, so that
The output voltage of Switching Power Supply is constant.
But for isolated Switching Power Supply, former secondary voltage is kept apart, and the acquisition of output voltage needs to utilize auxiliary
Winding or optocoupler are acquired, and output voltage setting is not flexible, need more peripheral components, and circuit is complex；For non-
Isolated Switching Power Supply can be provided with a FB pin, by FB pin come the defeated of sampling switch power supply in integrated circuits
The problems such as voltage out, short circuit, poor contact can occur for FB pin, so that effect is not achieved in Isobarically Control, and if not needing to acquire
Output voltage, it can FB pin is saved, to reduce cost.
Utility model content
The flexible Switching Power Supply control of less and output voltage setting the purpose of the utility model is to provide a kind of peripheral components
Circuit processed and Switching Power Supply, the setting for solving output voltage of the existing technology is not flexible, needs more peripheral components, electricity
Road is complex and the technical issues of needing sampling and outputting voltage.
To achieve the above object, the utility model provides a kind of switching power source control circuit, complete in auxiliary switch pipe afterflow
Cheng Hou, delay open Switching Power Supply main switch at the first time, according to auxiliary switch pipe time of afterflow and reference time, adjust inductance
Current peak or/and adjusting first time, so that control switch electric power output voltage is predeterminated voltage.
Optionally, after inductive current reaches pre-set peak value in Switching Power Supply, main switch shutdown, auxiliary switch pipe starts to continue
Stream；Inductive current starts lower than first threshold, and after postponing first time, Switching Power Supply main switch is connected.
Optionally, the reference time is proportional to the difference of inductive current pre-set peak value and first threshold.
Optionally, when the time of afterflow of auxiliary switch pipe is less than the reference time, reduce inductive current peak or/and extend the
One time, so that output voltage declines；
When the time of afterflow of auxiliary switch pipe is greater than the reference time, increases inductive current peak or/and shortens at the first time,
So that output voltage rises.
Optionally, when first time being lower than second threshold, by adjusting inductive current peak, so that output voltage maintains
In predeterminated voltage；
When inductive current peak be lower than third threshold value when, by adjust at the first time so that output voltage maintain it is default
Voltage.
Optionally, the switching power source control circuit includes error amplifier and delay circuit, the error amplifier
First input end receives the voltage signal of characterization auxiliary switch pipe time of afterflow, and the second input terminal of the error amplifier receives table
The voltage signal of sign reference time, the input terminal of the error amplifier output connection delay circuit, the delay circuit
Output end passes through the control terminal of logic circuit connection switch power main switch pipe, and the delay circuit is adjusted at the first time.
Optionally, the switching power source control circuit further includes that peak value adjusts circuit, and the peak value adjusts the input of circuit
The output end of end connection error amplifier, the output end that the peak value adjusts circuit are opened by logic circuit connection switch power supply master
The control terminal of pipe is closed, the peak value adjusts circuit and adjusts inductive current peak.
Optionally, the switching power source control circuit includes error amplifier and peak value adjusts circuit, the error amplification
The first input end of device receives the voltage signal of characterization auxiliary switch pipe time of afterflow, the second input terminal table of the error amplifier
The voltage signal of reference time is levied, the error amplifier output connects the input terminal that the peak value adjusts circuit, the peak
The output end that value adjusts circuit passes through the control terminal of logic circuit connection switch power main switch pipe, and the peak value adjusts circuit tune
Save inductive current peak.
The utility model also provides a kind of Switching Power Supply, including a kind of switching power source control circuit of any of the above and power electricity
Road.
Compared with prior art, the technical solution of the utility model has the advantage that the utility model in Switching Power Supply
After the completion of auxiliary switch pipe afterflow, delay opens Switching Power Supply main switch at the first time, passes through auxiliary switch pipe time of afterflow and ginseng
It examines the time, first time or/and inductive current peak is adjusted, and then have adjusted switch power source output voltage, thus control switch
Electric power output voltage is predeterminated voltage.The Switching Power Supply control method of the utility model is constant in control switch electric power output voltage
While, circuit is simple, peripheral components are less, do not need sampling and outputting voltage and output voltage setting is flexible.The utility model
Suitable for isolated and non-isolated Switching Power Supply, especially there is biggish advantage in isolation type switching power supply, do not need optocoupler
The information transmission on the former secondary side of isolation type switching power supply can be realized in equal peripheral circuits.
Detailed description of the invention
Fig. 1 is the circuit diagram of prior art switching power source control circuit；
Fig. 2 is the schematic diagram of the utility model switching power source control circuit embodiment；
Fig. 3 is the working waveform figure of the utility model switching power source control circuit；
Fig. 4 is the generation circuit figure for the voltage signal that the utility model characterizes auxiliary switch pipe time of afterflow.
Specific embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
The utility model provides a kind of switching power source control circuit, after the completion of auxiliary switch pipe afterflow, when postponing first
Between open Switching Power Supply main switch, according to auxiliary switch pipe time of afterflow and reference time, adjust inductive current peak or/and tune
Section first time, so that control switch electric power output voltage is predeterminated voltage.Specifically according to the auxiliary switch Guan Xu of current period
Time and reference time are flowed, the first time in this period or the peak value in next period are adjusted.
The reference time is proportional to the difference of inductive current peak and first threshold.Reference time Tref characterization switch
Electric power output voltage is predeterminated voltage V1, corresponding auxiliary to open when the difference of inductive current peak and first threshold is Ipeak-I0
Pass pipe time of afterflow, i.e. Tref=(Ipeak-I0) × L/V1, thus, for the same circuit, Tref=k × (Ipeak-
I0), the difference of k=L/V1, i.e., described reference time Tref and inductive current peak and first threshold is proportional.
Switching Power Supply is peak value control, i.e., after inductive current reaches pre-set peak value in Switching Power Supply, main switch shutdown is auxiliary
Switching tube starts afterflow；Inductive current starts lower than first threshold, and after postponing first time, Switching Power Supply main switch is connected.
When output voltage is higher than predeterminated voltage, the time of afterflow of auxiliary switch pipe is less than the reference time, reduces inductive current peak
Value or/and extension first time, so that output voltage declines；When output voltage is lower than predeterminated voltage, auxiliary switch pipe continues
The time is flowed greater than the reference time, is increased inductive current peak or/and is shortened at the first time, so that output voltage rises.
Above-mentioned switching power source control circuit only can adjust inductive current peak at the first time or only by adjusting come steady
Determine output voltage, can also be stabilized the output voltage at the first time with inductive current peak by adjusting simultaneously, it can also be not
Selection adjusts first time, inductive current peak or first time and inductive current peak respectively under the same period or different conditions
Value reaches above-mentioned purpose.Such as in a kind of preferably embodiment, when output power is excessive, it is lower than second threshold at the first time,
Then by adjusting inductive current peak, so that output voltage maintains predeterminated voltage；When output power is too small, inductive current peak
Lower than third threshold value, then by adjusting at the first time, so that output voltage maintains predeterminated voltage.
Above-mentioned second threshold and third threshold value can according to being configured in practice, the utility model to its occurrence not
It is limited.
As shown in Fig. 2, illustrating a kind of specific structure of embodiment of switching power source control circuit.Including error amplifier
U1, delay circuit and peak value adjust circuit, when the first input end of the error amplifier U1 receives characterization auxiliary switch pipe afterflow
Between T2 voltage signal VT2, the voltage signal of the second input terminal reception characterization reference time Tref of the error amplifier U1
Vref, the error amplifier U1 output thermal compensation signal are to delay circuit and peak value adjusting circuit, the delay circuit and described
Peak value adjusts the output end of circuit through the control terminal of logic circuit connection switch power main switch pipe, the error amplifier it is defeated
Outlet connects one end of capacitor C1, and the other end of capacitor C1 is grounded, and the voltage on capacitor C1 is Vcom.
The working waveform figure of switching power source control circuit is as shown in figure 3, wherein iLFor the inductive current of Switching Power Supply, T1 is
At the first time, switching tube time of afterflow supplemented by T2.As can be seen that the Switching Power Supply control is that peak value controls, inductive current reaches
To after pre-set peak value, main switch shutdown, auxiliary switch pipe starts afterflow；Inductive current starts lower than first threshold, delay first
After time T1, Switching Power Supply main switch is connected.The first threshold can be theoretically arbitrary value, in the reality of the utility model
It applies in example, first threshold zero.The turn-off time Toff of the main switch is equal to time of afterflow T2 and the delay of auxiliary switch pipe
The sum of time T1, i.e. Toff=T1+T2.
In the present embodiment output voltage change when, according to characterization auxiliary switch pipe time of afterflow T2 voltage signal VT2 and
The voltage signal Vref of reference time Tref is characterized, inductive current peak Vpeak is adjusted or/and adjusts first time T1, thus
Control switch electric power output voltage is predeterminated voltage V1.
The variation tendency of the time of afterflow T2 of the output voltage Vout and auxiliary switch pipe of the Switching Power Supply is opposite.
Specific adjustment process is as follows:
1) when switch power source output voltage Vout is greater than the set value V1, auxiliary switch pipe time of afterflow T2 shortens, auxiliary switch
The time of afterflow T2 of pipe is less than reference time Tref, characterizes the voltage signal of the time of afterflow T2 of the auxiliary switch pipe in current period
VT2Less than the voltage signal Vref, i.e. V of characterization reference time TrefT2Less than Vref, then the output voltage of error amplifier U1 becomes
Greatly, i.e., Vcom becomes larger, and reduces inductive current peak or/and extends at the first time, so that output voltage Vout declines；
2) when switch power source output voltage Vout is less than setting value V1, auxiliary switch pipe time of afterflow T2 is elongated, auxiliary switch
The time of afterflow T2 of pipe is greater than reference time Tref, then characterizes the voltage signal of the time of afterflow T2 of auxiliary switch pipe in current period
VT2Greater than the voltage signal Vref, i.e. V that characterization auxiliary switch pipe refers to time of afterflow TrefT2Less than Vref, then error amplifier U1
Output voltage become smaller, i.e., Vcom becomes smaller, increase inductive current peak or/and shorten at the first time so that output voltage
Vout rises；
1) and/or 2) 3) above-mentioned process is repeated, until the output voltage of Switching Power Supply is predeterminated voltage V1.
Above-mentioned adjustment process 1) and 2) in can only by delay circuit adjust at the first time stabilize the output voltage, can
Circuit adjusting inductive current peak is adjusted by peak value to stabilize the output voltage, and can also be adjusted simultaneously by delay circuit and peak value
Circuit is adjusted simultaneously to be stabilized the output voltage with inductive current peak at the first time, can also section or different in different times
Above-mentioned three kinds of regulative modes are selected under output state respectively.Such as in a kind of preferably embodiment, when output power is excessive, the
One time be lower than second threshold, by adjust inductive current peak adjust the reference time so that output voltage maintain it is pre-
If voltage；When output power is too small, inductive current peak is lower than third threshold value, by adjusting at the first time, so that output electricity
Pressure maintains predeterminated voltage.
The utility model simply shows one embodiment, in other examples, can there was only delay circuit, can also
To only have peak value to adjust circuit.
As shown in figure 4, giving the generation circuit of the voltage signal of characterization auxiliary switch pipe time of afterflow, including current detecting
Circuit and current source I1, switch S1 and capacitor C2, the current source I1, switch S1 and capacitor C2 are sequentially connected in series the two of power supply
End, the current detection circuit connect the control terminal of the switch S1.When current detection circuit detects that inductive current reaches peak
When being worth electric current, the switch S1 closure, the current source I1 starts to charge to capacitor C2, when current detection circuit detects
When inductor current value is zero, switch S1 is disconnected, and current source I1 stops powering to capacitor C2, and the voltage on capacitor C2 is table at this time
Levy the voltage signal V of auxiliary switch pipe time of afterflowT1。
It includes comparator that the peak value, which adjusts circuit, and one end of the comparator receives the first reference voltage Vref l, described
The other end of comparator acquires the inductive current of Switching Power Supply, the output end connection logic electricity of the comparator by sampling resistor
Road.When needing that inductive current peak is turned up, the first reference voltage Vref 1 is turned up, when needing to turn down inductive current peak, adjusts
Low first reference voltage Vref 1.
In addition, in the embodiment shown in Figure 2, auxiliary switch pipe time of afterflow T2 and reference time Tref are converted to voltage
Signal is compared, and in other examples, is also possible to directly carry out the comparison of the time other modes such as relatively, at this
In the protection scope of utility model.
The utility model is suitable for the output Isobarically Control of isolated and non-isolated switch, and in isolation type switching power supply
In, it does not need auxiliary winding or the complicated peripheral circuits such as optocoupler carries out, can directly carry out the information transmitting on former secondary side, advantage
It is more obvious.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (9)
1. a kind of switching power source control circuit, it is characterised in that: after the completion of auxiliary switch pipe afterflow, delay is opened out at the first time
Powered-down source main switch, according to auxiliary switch pipe time of afterflow and reference time, when adjusting inductive current peak or/and adjusting first
Between, so that control switch electric power output voltage is predeterminated voltage.
2. switching power source control circuit according to claim 1, it is characterised in that: inductive current reaches pre- in Switching Power Supply
If after peak value, main switch shutdown, auxiliary switch pipe starts afterflow；Inductive current starts lower than first threshold, and delay is at the first time
Afterwards, Switching Power Supply main switch is connected.
3. switching power source control circuit according to claim 1, it is characterised in that: the reference time and inductive current peak
The difference of value and first threshold is proportional.
4. switching power source control circuit according to claim 1 to 3, it is characterised in that: when continuing for auxiliary switch pipe
When flowing the time less than the reference time, reduce inductive current peak or/and extend at the first time, so that output voltage declines；
When the time of afterflow of auxiliary switch pipe is greater than the reference time, increases inductive current peak or/and shorten at the first time, thus
So that output voltage rises.
5. switching power source control circuit according to claim 4, it is characterised in that: be lower than second threshold when first time
When, by adjusting inductive current peak, so that output voltage maintains predeterminated voltage；
When inductive current peak is lower than third threshold value, by adjusting at the first time, so that output voltage maintains predeterminated voltage.
6. switching power source control circuit according to claim 4, it is characterised in that: the switching power source control circuit includes
Error amplifier and delay circuit, the first input end of the error amplifier receive the voltage of characterization auxiliary switch pipe time of afterflow
Signal, the second input terminal of the error amplifier receive the voltage signal of characterization reference time, the error amplifier it is defeated
The output end of the input terminal of outlet connection delay circuit, the delay circuit passes through logic circuit connection switch power main switch pipe
Control terminal, the delay circuit adjusts at the first time.
7. switching power source control circuit according to claim 6, it is characterised in that: the switching power source control circuit also wraps
It includes peak value and adjusts circuit, the peak value adjusts the output end of the input terminal connection error amplifier of circuit, and the peak value adjusts electricity
The output end on road passes through the control terminal of logic circuit connection switch power main switch pipe, and the peak value adjusts circuit and adjusts inductance electricity
Stream peak value.
8. switching power source control circuit according to claim 4, it is characterised in that: the switching power source control circuit includes
Error amplifier and peak value adjust circuit, and the first input end of the error amplifier receives characterization auxiliary switch pipe time of afterflow
Voltage signal, the second input terminal of the error amplifier receive the voltage signal of characterization reference time, the error amplifier
Output end connects the input terminal that the peak value adjusts circuit, and the output end that the peak value adjusts circuit is opened by logic circuit connection
The control terminal of powered-down source main switch, the peak value adjust circuit and adjust inductive current peak.
9. a kind of Switching Power Supply, which is characterized in that including any one switching power source control circuit of claim 1-8 and power electricity
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821596099.6U CN208971373U (en) | 2018-09-28 | 2018-09-28 | Switching power source control circuit and Switching Power Supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821596099.6U CN208971373U (en) | 2018-09-28 | 2018-09-28 | Switching power source control circuit and Switching Power Supply |
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| Publication Number | Publication Date |
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| CN208971373U true CN208971373U (en) | 2019-06-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194097A (en) * | 2018-09-28 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Switching power source control circuit and method and Switching Power Supply |
-
2018
- 2018-09-28 CN CN201821596099.6U patent/CN208971373U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194097A (en) * | 2018-09-28 | 2019-01-11 | 杰华特微电子（杭州）有限公司 | Switching power source control circuit and method and Switching Power Supply |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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