CN207977895U - Current transformer output voltage overshoots control circuit and output voltage controlling circuit - Google Patents
Current transformer output voltage overshoots control circuit and output voltage controlling circuit Download PDFInfo
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- CN207977895U CN207977895U CN201820159280.4U CN201820159280U CN207977895U CN 207977895 U CN207977895 U CN 207977895U CN 201820159280 U CN201820159280 U CN 201820159280U CN 207977895 U CN207977895 U CN 207977895U
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Abstract
The utility model discloses a kind of current transformer output voltages to overshoot control circuit, including voltage overshoot sample circuit and voltage overshoot suppression circuit, voltage overshoot sample circuit are connected with current transformer output end；The input terminal of voltage overshoot suppression circuit is connected with voltage overshoot sample circuit, and output end is connected with the PWM adjustment circuits of current transformer.The invention also discloses a kind of current transformer output voltage controlling circuits, control circuit is overshooted including output voltage sampling circuit, the second reference voltage circuit, output feedback circuit and current transformer output voltage as described above, output voltage sampling circuit is connected with current transformer output end, and output feedback circuit is connected with output voltage sampling circuit and PWM adjustment circuits respectively.The overshoot control circuit and control circuit of the utility model have many advantages, such as simple in structure, anti-output voltage overshoot.
Description
Technical field
The utility model relates generally to Semiconductor Converting Technology field, refers in particular to a kind of current transformer output voltage overshoot control circuit and defeated
Go out voltage control circuit.
Background technology
Currently, when controlling current transformer output voltage, the control circuit of use mostly uses greatly a reference voltage
Circuit, a voltage sampling circuit, a voltage feedback loop and control circuit composition.Control electricity using the above scheme
Road, when output loading is interrupted, output voltage overshoot can be more than 10% or more, to cause due to voltage spikes to lead to semiconductor devices
The problems such as stress is excessively high, output voltage is unstable, interference successive load.
Utility model content
The technical problems to be solved in the utility model is that：For technical problem of the existing technology, this practicality is new
Type provides a kind of current transformer output voltage overshoot control circuit and output voltage control simple in structure, preventing output voltage overshoot
Circuit.
In order to solve the above technical problems, the utility model proposes technical solution be：
A kind of current transformer output voltage overshoot control circuit, including voltage overshoot sample circuit and voltage overshoot inhibit electricity
Road, the voltage overshoot sample circuit are connected with current transformer output end；The input terminal of the voltage overshoot suppression circuit with it is described
Voltage overshoot sample circuit is connected, and output end is connected with the PWM adjustment circuits of current transformer；The voltage overshoot sample circuit is used for
Acquisition current transformer output voltage is simultaneously sent to voltage overshoot suppression circuit, and the voltage overshoot suppression circuit is used for defeated in current transformer
When going out voltage more than preset standard voltage, PWM adjustment circuits are outputed signal to reduce the duty ratio of PWM adjustment circuits.
As a further improvement of the above technical scheme：
The voltage overshoot suppression circuit includes operational amplifier UIB and diode D2, and the operational amplifier U1B's is anti-
Phase input terminal is connected to voltage overshoot sample circuit, and the in-phase input end of the operational amplifier UIB accesses preset standard voltage,
The output end of the operational amplifier U1B is connected through diode D2 with the PWM adjustment circuits, the diode D2 anode with
PWM adjustment circuits are connected, and cathode is connected with the output end of operational amplifier U1B；The inverting input of the operational amplifier U1B
Resistance R12 and capacitance C4 are in series between output end.
The voltage overshoot sample circuit includes resistance R7, R8, R9, R10 and capacitance C1, one end of the resistance R7 and change
It flows device output end to be connected, the other end is grounded after being sequentially connected in series R8, R9, and one end of the R10 is connected with one end of R7, other end string
It is connected with the inverting input of operational amplifier U1B after connection capacitance C1, and the tie point between R8 and R9 is connected.
Further include the first reference voltage circuit, for providing preset standard voltage.
First reference voltage circuit includes reference voltage source, resistance R1, R2 and R3, one end of the resistance R1 and institute
It states reference voltage source to be connected, the other end is grounded after being sequentially connected in series R2 and R3, and the other end of the R1 is same with operational amplifier U1B's
Phase input terminal is connected.
The reference voltage source is linear voltage regulator or microcontroller or DSP.
The invention also discloses a kind of current transformer output voltage controlling circuits, including output voltage sampling circuit,
Two reference voltage circuits, output feedback circuit and current transformer output voltage as described above overshoot control circuit, the output electricity
Pressure sample circuit is connected with current transformer output end, and the output feedback circuit is adjusted with output voltage sampling circuit and PWM respectively
Circuit is connected；The output voltage sampling circuit is described for acquiring current transformer output voltage and being sent to output feedback circuit
Output feedback circuit is used to send a control signal to the adjustment that PWM adjustment circuits carry out duty ratio according to output voltage signal.
As a further improvement of the above technical scheme：
The output feedback circuit includes operational amplifier UIA and diode D1, and the reverse phase of the operational amplifier U1A is defeated
Enter end and be connected to output voltage sampling circuit, the in-phase input end of the operational amplifier UIA accesses predetermined reference voltage, described
The output end of operational amplifier U1A is connected through diode D1 with the PWM adjustment circuits, the anode and PWM of the diode D1
Adjustment circuit is connected, and cathode is connected with the output end of operational amplifier U1A；The inverting input of the operational amplifier U1A with
The both ends that capacitance C3, the capacitance C3 are connected between output end are parallel with resistance R11 and capacitance C2, resistance R11 and capacitance C2
Series connection.
The output voltage sampling circuit includes resistance R4, R5 and R6, and wherein one end of R4 is connected with current transformer output end,
The other end is grounded after being sequentially connected in series R5 and R6, and the tie point of wherein R2 and R3 are connected with the inverting input of operational amplifier U1A.
The predetermined reference voltage is less than preset standard voltage.
Compared with prior art, the utility model has the advantage of：
The current transformer output voltage overshoot control circuit and current transformer output voltage controlling circuit of the utility model, voltage
When overshoot sample circuit detects that current transformer load end moment disconnects or is mutated, the work of voltage overshoot suppression circuit passes through PWM tune
Whole circuit changes current transformer working characteristics, stabilizes the output voltage；And it is simple in structure, be easily achieved.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model.
Figure label indicates：1, DC/DC translation circuits；2, PWM adjustment circuits；3, voltage overshoot sample circuit；4, voltage
Overshoot suppression circuit；5, reference voltage circuit；51, reference voltage source；6, output voltage sampling circuit；7, feedback circuit is exported.
Specific implementation mode
The utility model is further described below in conjunction with Figure of description and specific embodiment.
As shown in Figure 1, the current transformer output voltage of the present embodiment overshoots control circuit, including voltage overshoot sample circuit 3
With voltage overshoot suppression circuit 4, voltage overshoot sample circuit 3 is connected with current transformer output end；Voltage overshoot suppression circuit 4 it is defeated
Enter end with voltage overshoot sample circuit 3 to be connected, output end is connected with the PWM adjustment circuits 2 of current transformer；Voltage overshoot sample circuit
3 for acquiring current transformer output voltage and being sent to voltage overshoot suppression circuit 4, and voltage overshoot suppression circuit 4 is used in unsteady flow
When device output voltage is more than preset standard voltage, PWM adjustment circuits 2 are outputed signal to reduce the duty of PWM adjustment circuits 2
Than to make current transformer output voltage decline, reaching setting value.The current transformer course of normal operation of the present embodiment is：Such as Fig. 1 institutes
Show, VIN (input voltage) becomes Vout (output voltage), the output voltage of DC/DC translation circuits 1 by DC/DC translation circuits 1
It is approximately equal to input voltage and is multiplied by duty ratio, change duty ratio by PWM adjustment circuits 2 reaches to change output voltage values
The duty ratio of Vout design values, wherein PWM adjustment circuits 2 is constantly in dynamic change, can be adjusted Vout in real time and is approximately equal to
Vout setting values.The current transformer output voltage of the utility model overshoots control circuit, and voltage overshoot sample circuit 3 detects unsteady flow
When device load end moment disconnects or is mutated, voltage overshoot suppression circuit 4 works, and passes through PWM adjustment circuits 2 and changes accounting for for current transformer
Empty ratio, stabilizes the output voltage；And it is simple in structure, be easily achieved.
In the present embodiment, voltage overshoot suppression circuit 4 includes operational amplifier UIB and diode D2, operational amplifier U1B
Inverting input be connected to voltage overshoot sample circuit 3, the in-phase input end access preset standard electricity of operational amplifier UIB
Pressure, the output end of operational amplifier U1B are connected through diode D2 with PWM adjustment circuits 2, and anode and the PWM of diode D2 are adjusted
Circuit 2 is connected, and cathode is connected with the output end of operational amplifier U1B；The inverting input of operational amplifier U1B and output end it
Between be in series with resistance R12 and capacitance C4.
In the present embodiment, voltage overshoot sample circuit 3 includes resistance R7, R8, R9, R10 and capacitance C1, one end of resistance R7
It is connected with current transformer output end, the other end is grounded after being sequentially connected in series R8, R9, and one end of R10 is connected with one end of R7, other end string
It is connected with the inverting input of operational amplifier U1B after connection capacitance C1, and the tie point between R8 and R9 is connected.
Further include the first reference voltage circuit (reference voltage circuit 5 in Fig. 1) in the present embodiment, it is default for providing
Normal voltage；First reference voltage circuit includes reference voltage source, resistance R1, R2 and R3, one end of resistance R1 and reference voltage
Source is connected, and the other end is grounded after being sequentially connected in series R2 and R3, and the other end of R1 is connected with the in-phase input end of operational amplifier U1B.
Wherein reference voltage source is linear voltage regulator or microcontroller or DSP.
Specifically control process is：As shown in Figure 1, when Vout load end Rload moments disconnecting or being mutated, Vout mutation
Higher than setting value, C1 is more than REF2 in transient switching, Vout+FB2, and wherein 4 response speed of voltage overshoot suppression circuit is faster than instead
Current feed circuit, operational amplifier U1B work, D2 conductings, PWM adjustment circuits 2 detect that D2 is connected, and according to the voltage value of detection reality
When adjust duty ratio, 2 duty ratio of PWM adjustment circuits reduces, and Vout declines, and reaches Vout setting values.
As shown in Figure 1, the invention also discloses a kind of current transformer output voltage controlling circuit, including output voltage is adopted
Sample circuit 6, the second reference voltage circuit 5, output feedback circuit 7 and current transformer output voltage overshoot control electricity as described above
Road, output voltage sampling circuit 6 are connected with current transformer output end, output feedback circuit 7 respectively with output voltage sampling circuit 6 and
PWM adjustment circuits 2 are connected；Output voltage sampling circuit 6 is for acquiring current transformer output voltage and being sent to output feedback circuit
7, output feedback circuit 7 is used to send a control signal to the tune that PWM adjustment circuits 2 carry out duty ratio according to output voltage signal
It is whole.
In the present embodiment, output feedback circuit 7 includes operational amplifier UIA and diode D1, and operational amplifier U1A's is anti-
Phase input terminal is connected to output voltage sampling circuit 6, and the in-phase input end of operational amplifier UIA accesses predetermined reference voltage, fortune
The output end for calculating amplifier U1A is connected through diode D1 with PWM adjustment circuits 2, anode and the PWM adjustment circuits 2 of diode D1
It is connected, cathode is connected with the output end of operational amplifier U1A；Connect between the inverting input and output end of operational amplifier U1A
It is connected to capacitance C3, the both ends of capacitance C3 are parallel with resistance R11 and capacitance C2, and resistance R11 connects with capacitance C2.
In the present embodiment, output voltage sampling circuit 6 includes resistance R4, R5 and R6, and wherein one end of R4 and current transformer is defeated
Outlet is connected, and the other end is grounded after being sequentially connected in series R5 and R6, and the reverse phase of the tie point and operational amplifier U1A of wherein R2 and R3 is defeated
Enter end to be connected.
In the present embodiment, the first reference voltage circuit and the second reference voltage circuit are same reference voltage circuit 5, wherein
Predetermined reference voltage corresponds to REF2, and preset standard voltage corresponds to REF1, the wherein high 1%- of REF2 voltage values ratio REF1 voltage values
5%.
Specifically control process is：As shown in Figure 1, when Vout is less than setting value, Vout+FB1 is less than REF1, and D1 is not turned on,
PWM adjustment circuits 2 detect that D1 is not turned on, then adjust the duty ratio of PWM, and 2 duty ratio of PWM adjustment circuits increases, and leads on Vout
It rises, to reach Vout setting values.
When Vout is higher than setting value, Vout+FB1 is more than REF1, operational amplifier U1A work, D1 conductings, PWM adjustment electricity
Road 2 detects that D1 is connected, then adjusts the duty ratio of PWM, and 2 duty ratio of PWM adjustment circuits reduces, and Vout declines, to reach
Vout setting values.
Although the utility model has been disclosed with preferred embodiment as above, it is not limited to the utility model.It is any
Those skilled in the art, in the case where not departing from technical solutions of the utility model range, all using the disclosure above
Technology contents many possible changes and modifications are made to technical solutions of the utility model, or be revised as the equivalent of equivalent variations
Embodiment.Therefore, every content without departing from technical solutions of the utility model, according to the utility model technical spirit to above real
Any simple modifications, equivalents, and modifications that example is done are applied, should all be fallen in the range of technical solutions of the utility model are protected.
Claims (10)
1. a kind of current transformer output voltage overshoots control circuit, which is characterized in that including voltage overshoot sample circuit (3) and voltage
Overshoot suppression circuit (4), the voltage overshoot sample circuit (3) are connected with current transformer output end；The voltage overshoot inhibits electricity
The input terminal on road (4) is connected with the voltage overshoot sample circuit (3), PWM adjustment circuits (2) phase of output end and current transformer
Even；The voltage overshoot sample circuit (3) is used to acquire current transformer output voltage and is sent to voltage overshoot suppression circuit (4),
The voltage overshoot suppression circuit (4) is used to, when current transformer output voltage is more than preset standard voltage, output signal to PWM tune
Whole circuit (2) is to reduce the duty ratio of PWM adjustment circuits (2).
2. current transformer output voltage according to claim 1 overshoots control circuit, which is characterized in that the voltage overshoot suppression
Circuit (4) processed includes operational amplifier UIB and diode D2, and the inverting input of the operational amplifier U1B is connected to voltage
Sample circuit (3) is overshooted, the in-phase input end of the operational amplifier UIB accesses preset standard voltage, the operational amplifier
The output end of U1B is connected through diode D2 with the PWM adjustment circuits (2), anode and the PWM adjustment circuits of the diode D2
(2) it is connected, cathode is connected with the output end of operational amplifier U1B；The inverting input and output end of the operational amplifier U1B
Between be in series with resistance R12 and capacitance C4.
3. current transformer output voltage according to claim 2 overshoots control circuit, which is characterized in that the voltage overshoot is adopted
Sample circuit (3) includes resistance R7, R8, R9, R10 and capacitance C1, and one end of the resistance R7 is connected with current transformer output end, another
End is grounded after being sequentially connected in series R8, R9, and one end of the R10 is connected with one end of R7, is put with operation after other end series capacitance C1
The inverting input of big device U1B is connected, and the tie point between R8 and R9 is connected.
4. current transformer output voltage according to claim 2 or 3 overshoots control circuit, which is characterized in that further include first
Reference voltage circuit, for providing preset standard voltage.
5. current transformer output voltage according to claim 4 overshoots control circuit, which is characterized in that the first benchmark electricity
Volt circuit includes reference voltage source (51), resistance R1, R2 and R3, one end and the reference voltage source (51) phase of the resistance R1
Even, the other end is grounded after being sequentially connected in series R2 and R3, and the other end of the R1 is connected with the in-phase input end of operational amplifier U1B.
6. current transformer output voltage according to claim 5 overshoots control circuit, which is characterized in that the reference voltage source
(51) it is linear voltage regulator or microcontroller or DSP.
7. a kind of current transformer output voltage controlling circuit, which is characterized in that including output voltage sampling circuit (6), the second benchmark
Potential circuit, output feedback circuit (7) and the current transformer output voltage overshoot control as described in any one of claim 1 to 6
Circuit processed, the output voltage sampling circuit (6) are connected with current transformer output end, the output feedback circuit (7) respectively with it is defeated
Go out voltage sampling circuit (6) with PWM adjustment circuits (2) to be connected；The output voltage sampling circuit (6) is defeated for acquiring current transformer
Go out voltage and be sent to output feedback circuit (7), the output feedback circuit (7) is used to be sent according to output voltage signal and control
Signal carries out the adjustment of duty ratio to PWM adjustment circuits (2).
8. current transformer output voltage controlling circuit according to claim 7, which is characterized in that the output feedback circuit
(7) include operational amplifier UIA and diode D1, the inverting input of the operational amplifier U1A is connected to output voltage and adopts
The in-phase input end of sample circuit (6), the operational amplifier UIA accesses predetermined reference voltage, and the operational amplifier U1A's is defeated
Outlet is connected through diode D1 with the PWM adjustment circuits (2), anode and PWM adjustment circuits (2) phase of the diode D1
Even, cathode is connected with the output end of operational amplifier U1A；Between the inverting input and output end of the operational amplifier U1A
The both ends for being connected with capacitance C3, the capacitance C3 are parallel with resistance R11 and capacitance C2, and resistance R11 connects with capacitance C2.
9. current transformer output voltage controlling circuit according to claim 8, which is characterized in that the output voltage sampling electricity
Road (6) includes resistance R4, R5 and R6, and wherein one end of R4 is connected with current transformer output end, after the other end is sequentially connected in series R5 and R6
The tie point of ground connection, wherein R2 and R3 are connected with the inverting input of operational amplifier U1A.
10. current transformer output voltage controlling circuit according to claim 8, which is characterized in that the predetermined reference voltage
Less than preset standard voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820159280.4U CN207977895U (en) | 2018-01-30 | 2018-01-30 | Current transformer output voltage overshoots control circuit and output voltage controlling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820159280.4U CN207977895U (en) | 2018-01-30 | 2018-01-30 | Current transformer output voltage overshoots control circuit and output voltage controlling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207977895U true CN207977895U (en) | 2018-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820159280.4U Active CN207977895U (en) | 2018-01-30 | 2018-01-30 | Current transformer output voltage overshoots control circuit and output voltage controlling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350558A (en) * | 2020-09-29 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Dynamic overshot suppression circuit and suppression method |
| CN113258536A (en) * | 2021-07-08 | 2021-08-13 | 上海芯龙半导体技术股份有限公司南京分公司 | Output overshoot suppression circuit and switching power supply chip |
-
2018
- 2018-01-30 CN CN201820159280.4U patent/CN207977895U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350558A (en) * | 2020-09-29 | 2021-02-09 | 苏州浪潮智能科技有限公司 | Dynamic overshot suppression circuit and suppression method |
| CN113258536A (en) * | 2021-07-08 | 2021-08-13 | 上海芯龙半导体技术股份有限公司南京分公司 | Output overshoot suppression circuit and switching power supply chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Converter output voltage overshoot control circuit and output voltage control circuit Effective date of registration: 20200511 Granted publication date: 20181016 Pledgee: Changsha Bank city branch of Limited by Share Ltd Pledgor: CHANGSHA GUANGYI CONVERTING TECHNIQUE Co.,Ltd. Registration number: Y2020980002119 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210421 Granted publication date: 20181016 Pledgee: Changsha Bank city branch of Limited by Share Ltd. Pledgor: CHANGSHA GUANGYI CONVERTING TECHNIQUE Co.,Ltd. Registration number: Y2020980002119 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Converter output voltage overshoot control circuit and output voltage control circuit Effective date of registration: 20210427 Granted publication date: 20181016 Pledgee: Hunan Xingsha Rural Commercial Bank Co.,Ltd. quantang sub branch Pledgor: CHANGSHA GUANGYI CONVERTING TECHNIQUE Co.,Ltd. Registration number: Y2021980003071 |