CN207732638U - A kind of switching circuit control circuit and switching circuit - Google Patents
A kind of switching circuit control circuit and switching circuit Download PDFInfo
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- CN207732638U CN207732638U CN201721751081.4U CN201721751081U CN207732638U CN 207732638 U CN207732638 U CN 207732638U CN 201721751081 U CN201721751081 U CN 201721751081U CN 207732638 U CN207732638 U CN 207732638U
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Abstract
The utility model discloses a kind of switching circuit control circuit and switching circuits, switching circuit control circuit includes compensation circuit, the compensation circuit includes output voltage decision circuitry, timing circuit, transadmittance gain adjusts circuit and spaning waveguide operational amplifier, the first input end of spaning waveguide operational amplifier receives the first voltage signal of characterization output current, second input terminal of spaning waveguide operational amplifier receives reference voltage, one end of the output end connection compensating electric capacity of spaning waveguide operational amplifier, the other end of compensating electric capacity is grounded, output voltage decision circuitry and timing circuit receive the sampled signal of characterization output voltage, and it is connected respectively to the transadmittance gain and adjusts circuit, transadmittance gain adjusts the transadmittance gain of spaning waveguide operational amplifier described in circuit control, increase the charging current of compensating electric capacity in the startup stage of switching circuit, the voltage for accelerating compensating electric capacity rises.The climbing speed that the utility model passes through control compensating electric capacity voltage when originating working condition so that compensating electric capacity energy quick charge, and then complete quickly to start.
Description
Technical field
The utility model is related to switching circuit fields, more specifically to a kind of switching circuit control circuit and switch
Circuit.
Background technology
The functional block diagram of traditional LED drive circuit as shown in Figure 1, external communication input voltage after rectifier bridge rectification
The DC voltage VIN pulsed, then DC voltage VIN generated after switching circuit conversion process output voltage VO supply
Load, control circuit receive the sampled signal of DC voltage VIN, output voltage VO and switching circuit output, to generate control
Signal is to control the on off state in switching circuit, so that the expected output voltage signal of switching circuit output.
As shown in Fig. 2, control circuit generally comprises 5 submodules：Power supply module, sample circuit, compensation circuit, conducting are closed
Disconnected control circuit and driving circuit.Power supply module receives DC voltage VIN and output voltage VO to generate supply voltage as other
All submodule power supplies；The sampled signal of sample circuit reception switching circuit transmission obtains sampled signal and is transferred to after treatment
Compensation circuit；Compensation circuit is compensated signal by compensation deals, and thermal compensation signal, which is transferred to open, to be switched off control circuit to obtain
The control signal of switching circuit, control signal control the switch in switching circuit using driving circuit final output drive signal
State is to adjust output voltage VO.In general, the input structure of power supply module is as shown in figure 3, DC voltage VIN passes through startup
Resistance R0 to capacitance C02, output voltage VO arrive capacitance C02, the both ends of capacitance C02 by current-limiting resistance R1 and sustained diode 1
Voltage VCC is supply voltage.DC voltage VIN is charged by start-up resistor R0 to capacitance C02, and circuit, which provides, in order to control starts electricity
Stream, after chip is started to work, output voltage VO starts to charge to capacitance C02 by current-limiting resistance and fly-wheel diode, capacitance
The supply voltage of C02 is powered by power supply circuit for entire control circuit, and system normal operation is kept.
However, in the actual work, in order to filter out working frequency ripple wave, in the compensating electric capacity and switching circuit in compensation circuit
Output capacitance choose often very big, cause after driving circuit starts output voltage VO to rise very slow, and each switch periods
Turn-on time is very short, therefore the output voltage VO in power supply module is very weak to effective charging ability of capacitance C02, from driving circuit
It starts to work to supply voltage VCC to reach and needs longer time for electric equilibrium, often repeatedly restarting could complete to start
Journey so that the startup time is very long, or even can not be completed start-up course under the occasions such as continuous switching on and shutting down.
Utility model content
In view of this, the utility model proposes a kind of switching circuit control circuit and switching circuit, compensated by controlling
The climbing speed of compensating electric capacity voltage when originating working condition, can enhance charging energy of the output voltage to charging capacitor in circuit
Power, to which the supply voltage demand started in normal work be rapidly completed.
A kind of switching circuit control circuit of the utility model, including compensation circuit, the compensation circuit include output electricity
Decision circuitry, timing circuit, transadmittance gain is pressed to adjust circuit and spaning waveguide operational amplifier, the first input end of the spaning waveguide operational amplifier receives table
The first voltage signal of the output current of switching circuit is levied, the second input terminal of the spaning waveguide operational amplifier receives reference voltage, described
One end of the output end connection compensating electric capacity of spaning waveguide operational amplifier, the other end ground connection of the compensating electric capacity, the output voltage judge
Circuit and the timing circuit receive characterization switching circuit output voltage sampled signal, and respectively with the transadmittance gain
Circuit connection is adjusted, the transadmittance gain adjusts the transadmittance gain that circuit adjusts the spaning waveguide operational amplifier, in the startup of switching circuit
Stage increases the charging current to compensating electric capacity, accelerates the rate of voltage rise of compensating electric capacity.
Optionally, the transadmittance gain of the spaning waveguide operational amplifier is on startup the first transadmittance gain, when the timing circuit meter
When reaching first time threshold, the transadmittance gain adjust circuit adjust the spaning waveguide operational amplifier transadmittance gain become second across
Gain is led, second transadmittance gain is less than first transadmittance gain.
Optionally, the transadmittance gain of the spaning waveguide operational amplifier is on startup the first transadmittance gain, when the output voltage is sentenced
When deenergizing detects that the output voltage reaches first voltage threshold value or the timing circuit timing reaches first time threshold,
The transadmittance gain that the transadmittance gain adjusting circuit adjusts the spaning waveguide operational amplifier becomes the second transadmittance gain, and second mutual conductance increases
Benefit is less than first transadmittance gain.
Optionally, the first input end of the spaning waveguide operational amplifier receives the output current of characterization switching circuit through first switch
First voltage signal；
When the output voltage sampled signal is less than second voltage threshold value, the first switch disconnects, when the output
When voltage sampling signal is more than second voltage threshold value, the first switch is closed.
Optionally, timing is realized by the way of to switch cycle count, when on-off times reach preset value, the mutual conductance
Gain becomes the second transadmittance gain from the first transadmittance gain.
Optionally, the on-off times are fixed, the voltage regulating switch pipe service time of the compensating electric capacity,
When output voltage is less than tertiary voltage threshold value, the switching tube turn-off time is fixed；
When output voltage is equal to or more than tertiary voltage threshold value, when the output voltage adjusts the switching tube shutdown
Between.
The utility model also proposed a kind of switching circuit, including the switch electricity described in power stage circuit and any of the above item
Road control circuit,
The switching circuit control circuit receives the voltage of rectifier bridge output and the output voltage signal of switching circuit and defeated
Go out current signal, to generate the switch motion that switch control signal controls power switch tube in the power stage circuit.
Optionally, the switching circuit is LED drive circuit.
In conclusion according to the utility model switching circuit control circuit and switching circuit, transported by controlling the mutual conductance
The transadmittance gain put makes the climbing speed of compensating electric capacity voltage when originating working condition in compensation circuit accelerate so that compensation
Capacitance energy quick charge can enhance charging energy of the output voltage to output capacitance to lengthen the turn-on time of power switch tube
The transadmittance gain switching of spaning waveguide operational amplifier after a period of time to be launched, is led normal operating conditions by power later.The utility model can
By controlling the charging current of compensating electric capacity, charging ability of the output voltage to output capacitance is enhanced so that can complete fast
Speed starts.
Description of the drawings
Fig. 1 is the functional block diagram of traditional LED drive circuit；
Fig. 2 is the module map of control circuit in Fig. 1；
Fig. 3 is the input structure figure of power supply module in Fig. 2；
Fig. 4 is the compensation circuit circuit diagram of the utility model switching circuit control circuit；
Fig. 5 is the first control principle drawing of compensation circuit in the utility model；
Fig. 6 is second of control principle drawing of compensation circuit in the utility model；
Fig. 7 is the third control principle drawing of compensation circuit in the utility model；
Fig. 8 is the 4th kind of control principle drawing of compensation circuit in the utility model.
Specific implementation mode
The preferred embodiment of the utility model is described in detail below in conjunction with attached drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement 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 description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing
Be all made of more simplified form and use non-accurate ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
Some preferred embodiments of the utility model are described in detail below with reference to attached drawing, but the utility model is not limited to
This.
In the utility model embodiment, the switching circuit is by taking LED drive circuit as an example, but the control of the utility model
Circuit is using without being limited thereto, and the control circuit of the LED drive circuit is as shown in Fig. 2, power supply module, sampling in control circuit
Circuit, conducting switch off control circuit consistent in the structure and function of driving circuit and Fig. 2, and details are not described herein.It is different
It is, due to there is a problem of that startup in the prior art is slow, to be improved in the present invention compensation circuit.
The circuit diagram of the compensation circuit according to the utility model is shown with reference to figure 4, the compensation circuit includes output electricity
Decision circuitry, timing circuit, transadmittance gain is pressed to adjust circuit and spaning waveguide operational amplifier OTA, the first input end of the spaning waveguide operational amplifier OTA
The second input terminal for receiving first voltage the signal Vi, the spaning waveguide operational amplifier OTA for the characterization output current that sampling obtains receives ginseng
Examine one end of the output end connection compensating electric capacity C1 of voltage Vref, the spaning waveguide operational amplifier OTA, the other end of the compensating electric capacity C1
Ground connection, the output voltage decision circuitry and the timing circuit receive the sampled signal VFB of characterization output voltage, and respectively
It being connected to the transadmittance gain and adjusts circuit, the transadmittance gain adjusts the transadmittance gain gm of spaning waveguide operational amplifier described in circuit control,
The charging current for increasing compensating electric capacity in the startup stage of switching circuit, the voltage for accelerating compensating electric capacity rise.
When exporting not charged, the control principle drawing of the compensation circuit as shown in figure 5, the spaning waveguide operational amplifier mutual conductance
Gain gm on startup be the first transadmittance gain gm1, when the timing circuit timing reaches first time threshold t1, it is described across
Gain adjusting circuit is led to control so that the transadmittance gain of the spaning waveguide operational amplifier becomes gm as the second transadmittance gain gm2, described second across
It leads gain gm2 and is less than the first transadmittance gain gm1.The transadmittance gain of startup stage is bigger so that the output of spaning waveguide operational amplifier
Electric current is larger, and then accelerates the rising of compensating electric capacity voltage.As shown in Figure 5, it can be seen that the voltage Vc1 of compensating electric capacity C1 is in t1
Rate of change before is bigger, and the variation after t1 is smaller, illustrates that startup stage can complete to the fast of compensating electric capacity C1
Speed charging.
As shown in fig. 6, the transadmittance gain gm of the spaning waveguide operational amplifier is on startup the first transadmittance gain gm1, when described defeated
Go out voltage decision circuitry and makes output voltage VFBReach first voltage threshold value VFB1Judgement, the transadmittance gain adjusts circuit control
System is so that the transadmittance gain of the spaning waveguide operational amplifier becomes gm and is less than described into the second transadmittance gain gm2, the second transadmittance gain gm2
First transadmittance gain gm1.The transadmittance gain of startup stage is bigger so that the output current of spaning waveguide operational amplifier is larger, and then accelerates
The rising of compensating electric capacity voltage.As shown in Figure 6, it can be seen that the voltage Vc1 of compensating electric capacity C1 is in VFB1Rate of change ratio before
It is larger, VFB1Variation later is smaller, illustrates that startup stage can complete the quick charge to compensating electric capacity C1.
When exporting electrification, the V in t1 and Fig. 6 in Fig. 5 is mainly seenFB1Who first reaches, just according to above-mentioned Fig. 5 or Fig. 6
In process controlled.
On the basis of said program, in order to further speed up startup rate, first is added to open in the first input end of mutual conductance
Close S1, i.e., the first input end of the described spaning waveguide operational amplifier OTA receives the of the output current of characterization switching circuit through first switch S1
One voltage signal.
When exporting electrification, as shown in fig. 7, working as the output voltage sampled signal VFBLess than second voltage threshold value VFB2When,
The first switch S1 is disconnected, as the output voltage sampled signal VFBMore than second voltage threshold value VFB2When, the first switch
S2 is closed.The transadmittance gain gm of the spaning waveguide operational amplifier is on startup the first transadmittance gain gm1, when the timing circuit timing reaches
When to first time threshold t1, the transadmittance gain adjusts circuit control and the transadmittance gain of the spaning waveguide operational amplifier is made to become gm as the
Two transadmittance gain gm2, the second transadmittance gain gm2 are less than the first transadmittance gain gm1.
In VFBLess than VFB2When, the output current of the spaning waveguide operational amplifier is gm1*Vref
In VFBMore than VFB2And t, when being less than t1, the output current of the spaning waveguide operational amplifier is gm1* (Vref-Vi)
When t is more than t1, the output current of the spaning waveguide operational amplifier is gm2* (Vref-Vi)
The output of spaning waveguide operational amplifier is charged directly to compensating electric capacity, due to
Gm1*Vref ＞ gm1* (Vref-Vi) ＞ gm2* (Vref-Vi)
Therefore voltage change in the charging process of compensating electric capacity is as shown in fig. 7, the transadmittance gain in startup stage is bigger,
So that the output current of spaning waveguide operational amplifier is larger, and then accelerate the rising of compensating electric capacity voltage.And most starting directly to compensation electricity
Hold the electricity for rushing a period of time so that start faster.As shown in Figure 7, it can be seen that compensating electric capacity C1 is in VFB2Voltage Vc1 before
Quickly, rate of changes of the Vc1 before t1 is bigger later, and the variation after t1 is smaller for variation, illustrates that startup stage can be with
Complete the quick charge to compensating electric capacity C1.
As shown in figure 8, working as the output voltage sampled signal VFBLess than second voltage threshold value VFB2When, the first switch
S1 is disconnected, as the output voltage sampled signal VFBMore than second voltage threshold value VFB2When, the first switch S2 is closed.It is described
The transadmittance gain gm of spaning waveguide operational amplifier is on startup the first transadmittance gain gm1, when the output voltage decision circuitry makes output
Voltage VFBReach first voltage threshold value VFB1Judgement when, the transadmittance gain adjusts circuit control and makes the spaning waveguide operational amplifier
Transadmittance gain becomes gm and is less than the first transadmittance gain gm1 into the second transadmittance gain gm2, the second transadmittance gain gm2.
In VFBLess than VFB2When, the output current of the spaning waveguide operational amplifier is gml*Vref
In VFBMore than VFB2And VFBLess than VFB1When, the output current of the spaning waveguide operational amplifier is gm1* (Vref-Vi)
Work as VFBMore than VFB1When, the output current of the spaning waveguide operational amplifier is gm2* (Vref-Vi)
The output of spaning waveguide operational amplifier is charged directly to compensating electric capacity, due to
Gm1*Vref ＞ gm1* (Vref-Vi) ＞ gm2* (Vref-Vi)
Therefore the voltage change in the charging process of compensating electric capacity in the transadmittance gain in startup stage as shown in fig. 7, compare
Greatly so that the output current of spaning waveguide operational amplifier is larger, and then accelerates the rising of compensating electric capacity voltage.And most starting directly to compensation
Capacitance rushes the electricity of a period of time so that starts faster.As shown in Figure 7, it can be seen that compensating electric capacity C1 is in VFB2Voltage before
Vc1 changes quickly, and Vc1 is in V laterFB1Rate of change before is bigger, VFB1Variation later is smaller, illustrates startup stage
It can complete the quick charge to compensating electric capacity C1.
When exporting electrification, the V in t1 and Fig. 8 in Fig. 7 is mainly seenFB1Who first reaches, just according to above-mentioned Fig. 7 or Fig. 8
In process controlled.
Using to switch cycle count by the way of realize timing, when on-off times reach preset value, the transadmittance gain from
First transadmittance gain becomes the second transadmittance gain.
The on-off times can be made to fix in the utility model, the first time threshold is determined by switch periods
Value.The on-off times are fixed, the voltage regulating switch pipe service time of the compensating electric capacity,
The timing circuit receives the sampled signal V of characterization output voltageFB,
As the sampled signal V of characterization output voltageFBLess than tertiary voltage threshold value VFB3When, the switching tube turn-off time is equal to most
The big turn-off time；
As the sampled signal V of characterization output voltageFBEqual to or more than tertiary voltage threshold value VFB3When, the output voltage
The switching tube turn-off time is adjusted, when output voltage is bigger, the turn-off time of switching tube is smaller.
The sampled signal V of the output voltageFBPossible initial value is to be less than, be equal to and more than tertiary voltage threshold value VFB3, most
It is more than tertiary voltage threshold value V under normal circumstances eventuallyFB3。
Therefore first time threshold t1 is equal to the sum of all switch periods in switch counts.
It is fixed using the number of switch counts in the present embodiment, can also be the direct set time.
It should be noted that first time threshold t1, first voltage threshold value V hereFB1, second voltage threshold value VFB2All it is
Can voluntarily it be arranged according to actual conditions, it is considered that reach V at t1 moment or output voltageFB1After start and completed.
Different values can be arranged in the first transadmittance gain gm1 and the second transadmittance gain gm2 according to actual conditions.Described
One voltage threshold VFB1With the tertiary voltage threshold value VFB3There is no any direct relation.Second voltage threshold value VFB2Less than the first electricity
Press threshold value VFB1。
Above by taking switching circuit is LED drive circuit as an example, but the control circuit of the utility model switching circuit can be with
Applied in the suitable switching circuit such as AC-DC voltage conversion circuit, DC-DC voltage conversion circuit.Although this reality
It is exchange input with novel embodiment, but the scheme of the utility model is equally applicable to direct current input, it is new according to this practicality
The introduction of type, this point can be known by those of ordinary skill in the art.
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 domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of switching circuit control circuit, including compensation circuit, it is characterised in that：
The compensation circuit includes that output voltage decision circuitry, timing circuit, transadmittance gain adjust circuit and spaning waveguide operational amplifier, described
The first input end of spaning waveguide operational amplifier receives the first voltage signal of the output current of characterization switching circuit, and the of the spaning waveguide operational amplifier
Two input terminals receive reference voltage, the spaning waveguide operational amplifier output end connection compensating electric capacity one end, the compensating electric capacity it is another
One end ground connection, the output voltage decision circuitry and the timing circuit receive the sampling of the output voltage of characterization switching circuit
Signal, and adjust circuit with the transadmittance gain respectively and connect, the transadmittance gain adjusts circuit and adjusts the spaning waveguide operational amplifier
Transadmittance gain increases the charging current to compensating electric capacity in the startup stage of switching circuit, and the voltage for accelerating compensating electric capacity rises.
2. switching circuit control circuit according to claim 1, it is characterised in that：
The transadmittance gain of the spaning waveguide operational amplifier is on startup the first transadmittance gain, when the timing circuit timing reaches first
Between threshold value when, the transadmittance gain, which adjusts circuit and adjusts the transadmittance gain of the spaning waveguide operational amplifier, becomes the second transadmittance gain, described
Second transadmittance gain is less than first transadmittance gain.
3. switching circuit control circuit according to claim 1, it is characterised in that：
The transadmittance gain of the spaning waveguide operational amplifier is on startup the first transadmittance gain, when the output voltage decision circuitry detects
The output voltage reaches first voltage threshold value or when the timing circuit timing reaches first time threshold, the transadmittance gain
Adjusting circuit and adjusting the transadmittance gain of the spaning waveguide operational amplifier becomes the second transadmittance gain, and second transadmittance gain is less than described the
One transadmittance gain.
4. switching circuit control circuit according to claim 2 or 3, it is characterised in that：The first of the spaning waveguide operational amplifier is defeated
Enter the first voltage signal that end receives the output current of characterization switching circuit through first switch；
When the output voltage sampled signal is less than second voltage threshold value, the first switch disconnects, when the output voltage
When sampled signal is more than second voltage threshold value, the first switch is closed.
5. switching circuit control circuit according to claim 2 or 3, it is characterised in that：Using to switch cycle count
Mode realizes timing, and when on-off times reach preset value, the transadmittance gain becomes the second transadmittance gain from the first transadmittance gain.
6. switching circuit control circuit according to claim 5, it is characterised in that：The on-off times are fixed, the benefit
The voltage regulating switch pipe service time of capacitance is repaid,
When output voltage is less than tertiary voltage threshold value, the switching tube turn-off time is fixed；
When output voltage is equal to or more than tertiary voltage threshold value, the output voltage adjusts the switching tube turn-off time.
7. a kind of switching circuit, it is characterised in that：Including power stage circuit and claim 1-6 any one of them switching circuits
Control circuit,
The switching circuit control circuit receives the voltage of rectifier bridge output and the output voltage signal of switching circuit and output electricity
Signal is flowed, to generate the switch motion that switch control signal controls power switch tube in the power stage circuit.
8. switching circuit according to claim 7, it is characterised in that：The switching circuit is LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721751081.4U CN207732638U (en) | 2017-12-15 | 2017-12-15 | A kind of switching circuit control circuit and switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721751081.4U CN207732638U (en) | 2017-12-15 | 2017-12-15 | A kind of switching circuit control circuit and switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207732638U true CN207732638U (en) | 2018-08-14 |
Family
ID=63098507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721751081.4U Active CN207732638U (en) | 2017-12-15 | 2017-12-15 | A kind of switching circuit control circuit and switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207732638U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947560A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | On-off circuit control circuit and on-off circuit |
| CN112910424A (en) * | 2021-01-18 | 2021-06-04 | 杰华特微电子（杭州）有限公司 | Operational amplifier circuit and switching circuit |
-
2017
- 2017-12-15 CN CN201721751081.4U patent/CN207732638U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947560A (en) * | 2017-12-15 | 2018-04-20 | 杰华特微电子（杭州）有限公司 | On-off circuit control circuit and on-off circuit |
| CN112910424A (en) * | 2021-01-18 | 2021-06-04 | 杰华特微电子（杭州）有限公司 | Operational amplifier circuit and switching circuit |
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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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