CN110829799A - Constant power output circuit - Google Patents
Constant power output circuit Download PDFInfo
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- CN110829799A CN110829799A CN201911153530.9A CN201911153530A CN110829799A CN 110829799 A CN110829799 A CN 110829799A CN 201911153530 A CN201911153530 A CN 201911153530A CN 110829799 A CN110829799 A CN 110829799A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a constant power output circuit, which comprises a primary winding, a secondary winding, an auxiliary winding, a power tube, a first resistor, a sampling and holding unit, an error amplifier, a comparator, a detection unit and a logic control unit, wherein the primary winding and the auxiliary winding are respectively coupled with the secondary winding, the primary winding is respectively connected with one end of the logic control unit, the input end of the sampling and holding unit, the inverting input end of the comparator and the first resistor through the power tube, the input end of the detection unit is respectively connected with the sampling and holding unit and the auxiliary winding, the output end of the detection unit is connected with the inverting input end of the comparator through the error amplifier, and the output end of the comparator is connected with the other end of the logic control unit. The error signal generated by the error amplifier adjusts the voltage of the first resistor through the comparator, so that the current on the primary winding is changed, the effect of constant current in the constant-power output circuit is achieved, the fluctuation range of the output power is reduced, and the stability of the constant-power output circuit is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a constant power output circuit.
Background
Most of the existing brands of smart phones are compatible with Qc4.0 and Pd protocols, the output range is very wide, the mainstream output of the existing flash charging low-voltage and high-current technology is 4-12V, but most of charger chips limit power by limiting peak current and fixed frequency, the fluctuation range of the output power is very large due to the wide fluctuation range of the peak current and the frequency, and the mobile phone and the charger are easily damaged due to the charging mode of the constant-power output circuit with poor stability.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a constant power output circuit with high stability is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a constant-power output circuit comprises a primary winding, a secondary winding, an auxiliary winding, a power tube, a first resistor, a sampling and holding unit, an error amplifier, a comparator, a detection unit and a logic control unit, wherein the primary winding and the auxiliary winding are respectively coupled with the secondary winding, the primary winding is respectively connected with one end of the logic control unit, the input end of the sampling and holding unit, the inverting input end of the comparator and the first resistor through the power tube, the input end of the detection unit is respectively connected with the sampling and holding unit and the auxiliary winding, the output end of the detection unit is connected with the non-inverting input end of the comparator through the error amplifier, and the output end of the comparator is connected with the other end of the logic control unit.
The invention has the beneficial effects that: the error signal generated by the error amplifier adjusts the voltage of the first resistor through the comparator, so that the current on the primary winding is changed, the effect of constant current in the constant-power output circuit is achieved, the fluctuation range of the output power is reduced, and the stability of the constant-power output circuit is improved.
Drawings
Fig. 1 is a schematic diagram of a constant power output circuit according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a sample-and-hold unit of a constant power output circuit according to a first embodiment of the present invention;
FIG. 3 is a circuit diagram of a first multiplier of the constant power output circuit according to the first embodiment of the present invention;
FIG. 4 is a circuit diagram of a second multiplier of the constant power output circuit according to the first embodiment of the present invention;
fig. 5 is a circuit diagram of a voltage detection unit of the constant power output circuit according to the first embodiment of the invention.
Description of reference numerals:
1. a sample-and-hold unit; 2. a logic control unit; 3. a voltage detection unit; 4. a time detection unit; 5. a first multiplier; 6. a second multiplier;
l1, primary winding; l2, secondary winding; l3, auxiliary winding;
q, a power tube;
r, sampling resistance; r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor;
u1, error amplifier; u2, a comparator;
D. a diode; C. a capacitor; c1, a first capacitance; c2, a second capacitor;
a1, a first operational amplifier; a2, a second operational amplifier; k1, a first switch; k2, a second switch; k3, a third switch; k4, fourth switch;
gm1, a first transconductance amplifier; gm2, a second transconductance amplifier; gm3, third transconductance amplifier; gm4, fourth transconductance amplifier.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key concept of the invention is as follows: the error signal generated by the error amplifier adjusts the voltage of the first resistor through the comparator, so that the current on the primary winding is changed.
Referring to fig. 1, a constant power output circuit includes a primary winding L1, a secondary winding L2, an auxiliary winding L3, a power tube Q, a first resistor R1, a sample-and-hold unit 1, an error amplifier U1, a comparator U2, a detection unit, and a logic control unit 2, where the primary winding L1 and the auxiliary winding L3 are respectively coupled to the secondary winding L2, the primary winding L1 is respectively connected to one end of the logic control unit 2, an input end of the sample-and-hold unit 1, an inverting input end of the comparator U2, and the first resistor R1 through the power tube Q, an input end of the detection unit is respectively connected to the sample-and-hold unit 1 and the auxiliary winding L3, an output end of the detection unit is connected to a non-inverting input end of the comparator U2 through the error amplifier U1, and an output end of the comparator U2 is connected to the other end of the logic control unit 2.
The working principle of the invention is briefly described as follows: the error amplifier generates corresponding error signals according to signals of the detection unit and the sampling and holding unit, transmits the error signals to the comparator, and adjusts the voltage of the first resistor by using the comparator.
From the above description, the beneficial effects of the present invention are: the error signal generated by the error amplifier adjusts the voltage of the first resistor through the comparator, so that the current on the primary winding is changed, the effect of constant current in the constant-power output circuit is achieved, the fluctuation range of the output power is reduced, and the stability of the constant-power output circuit is improved.
Further, the detection unit includes a voltage detection unit 3, a time detection unit 4, a first multiplier 5 and a second multiplier 6, the auxiliary winding L3 is connected to a first input terminal of the first multiplier 5 through the voltage detection unit 3, the auxiliary winding L3 is connected to a first input terminal of the second multiplier 6 through the time detection unit 4, a second input terminal of the second multiplier 6 is connected to the sample-and-hold unit 1, an output terminal of the second multiplier 6 is connected to a second input terminal of the first multiplier 5, and an output terminal of the first multiplier 5 is connected to a non-inverting input terminal of the comparator U2 through the error amplifier U1.
Further, the output end of the first multiplier 5 is connected to the non-inverting input end of the error amplifier U1, and the inverting input end of the error amplifier U1 is provided with a reference voltage.
As can be seen from the above description, the error between the first multiplier and the reference voltage generates an error signal through the error amplifier, which can improve the sensitivity of the system.
Furthermore, one end of the first resistor R1 is connected to the power transistor Q, and the other end of the first resistor R1 is grounded.
Furthermore, the voltage detection circuit further comprises a second resistor R2 and a third resistor R3, one end of the auxiliary winding L3 is grounded, the other end of the auxiliary winding L3 is grounded through a second resistor R2 and a third resistor R3 which are connected in series, and the connection position of the second resistor R2 and the third resistor R3 is respectively connected with the voltage detection unit 3 and the time detection unit 4.
Further, the device also comprises a discharge circuit, wherein the discharge circuit comprises a diode D, a capacitor C and a fourth resistor R4, the diode D and the fourth resistor R4 are connected in series and on the secondary winding L2, and the fourth resistor R4 is connected in parallel with the capacitor C.
Example one
Referring to fig. 1, a first embodiment of the present invention is: a constant power output circuit comprises a primary winding L1, a secondary winding L2, an auxiliary winding L3, a power tube Q, a first resistor R1, a sample-and-hold unit 1, an error amplifier U1, a comparator U2, a detection unit and a logic control unit 2, wherein the primary winding L1 and the auxiliary winding L3 are respectively coupled with the secondary winding L2, the primary winding L1 is respectively connected with one end of the logic control unit 2, the input end of the sample-and-hold unit 1, the inverting input end of the comparator U2 and the first resistor R1 through the power tube Q, the input end of the detection unit is respectively connected with the sample-and-hold unit 1 and the auxiliary winding L3, the output end of the detection unit is connected with the positive phase input end of the comparator U2 through the error amplifier U1, and the output end of the comparator U2 is connected with the other end of the logic control unit 2.
Referring to fig. 1, the detecting unit includes a voltage detecting unit 3, a time detecting unit 4, a first multiplier 5 and a second multiplier 6, the auxiliary winding L3 is connected to a first input terminal of the first multiplier 5 through the voltage detecting unit 3, the auxiliary winding L3 is connected to a first input terminal of the second multiplier 6 through the time detecting unit 4, a second input terminal of the second multiplier 6 is connected to the sample-and-hold unit 1, an output terminal of the second multiplier 6 is connected to a second input terminal of the first multiplier 5, an output terminal of the first multiplier 5 is connected to a non-inverting input terminal of a comparator U2 through an error amplifier U1, specifically, an output terminal of the first multiplier 5 is connected to a non-inverting input terminal of the error amplifier U1, and an inverting input terminal of the error amplifier U1 is provided with a reference voltage.
Referring to fig. 5, when the secondary inductor starts demagnetization, the switch K is closed, and after an internal delay of 2 μ S, the switch K is turned off, and the voltage of the capacitor C is proportional to the system output voltage, which is K vout, where K is the fixed proportionality coefficient of the system.
In this embodiment, one end of the first resistor R1 is connected to the power transistor Q, and the other end of the first resistor R1 is grounded.
Referring to fig. 2, the follower includes a sampling resistor R, a first switch K1, a second switch K2, a first capacitor C1, a second capacitor C2, an operational amplifier a1, a power tube Q is turned on, a first switch K1 is turned on, a primary side L1 of the transformer starts to store energy, current starts to increase linearly, voltage of the sampling resistor R starts to increase linearly, voltage of the first capacitor C1 is equal to voltage of the sampling resistor R, when a comparison point of the comparator U2 is reached, a power tube Q is turned off, and a first switch K1 is turned off, at this time, voltage sampling of the first capacitor C1 is peak voltage of Rcs, the second switch K2 is turned on after internal fixed delay, and the second capacitor C2 is far smaller than the first capacitor C1, so that voltage of the first capacitor C1 is equal to voltage of the second capacitor C2, and a follower output is formed by the operational amplifier a 1.
In detail, the voltage detection circuit further comprises a second resistor R2 and a third resistor R3, one end of the auxiliary winding L3 is grounded, the other end of the auxiliary winding L3 is grounded through a second resistor R2 and a third resistor R3 which are connected in series, and the connection between the second resistor R2 and the third resistor R3 is respectively connected with the voltage detection unit 3 and the time detection unit 4.
The high-voltage direct-current motor further comprises a discharge circuit, wherein the discharge circuit comprises a diode D, a capacitor C and a fourth resistor R4, the diode D is connected with the fourth resistor R4 in series and is connected to the secondary winding L2, and the fourth resistor R4 is connected with the capacitor C in parallel.
It is easy to understand that the logic control unit 2 controls the power tube Q to be turned on, the power tube Q can be either a mosfet or a triode, the primary winding L1 of the transformer starts to store energy, the primary winding L1 is connected with a high-voltage power supply end, the current on the primary winding starts to increase linearly, when the current increases and the error amplifier U1 has an output voltage, the power tube Q is turned off, at this time, the sampling and holding unit 1 samples the voltage at the time of turn-off into the sampling and holding unit 1, which is set as I1, and the output voltage of the sampling and holding unit 1 is used as the input of the second multiplier 6; after the power tube Q is turned off, the secondary winding L2 discharges through the diode D, the capacitor C and the fourth resistor R4. The second multiplier 6 may output an average current value according to the time detection unit 4 and the sample hold unit 1, and the first multiplier 5 may output an average voltage value according to the average current value and the voltage detection unit 3, the average voltage value being transmitted to the non-inverting input terminal of the error amplifier U1.
Referring to fig. 3, the third switch K3, the third switch K4 are control signals with opposite phases, the third switch K3 is controlled by the time detection unit, the output of the time detection unit is the degaussing duty cycle signal of the secondary side inductor, so the third switch K3 is the degaussing duty cycle signal, when the third switch K3 is closed, the output signal of the sample-hold unit is input to one end of the sampling resistor R, the third switch K3 is open, the third switch K4 is closed, and the input end of the sampling resistor R is grounded. Therefore, the multiplication of the degaussing duty ratio signal and the sampling holding output signal is realized, and the direct current level is output after the filtering of the sampling resistor R and the capacitor C.
Referring to fig. 4, the present invention includes four transconductance amplifiers, a first transconductance amplifier gm1, a second transconductance amplifier gm2, a third transconductance amplifier gm3 and a fourth transconductance amplifier gm4, wherein the first transconductance amplifier gm1, the second transconductance amplifier gm2, the third transconductance amplifier gm3 and the fourth transconductance amplifier gm4 are connected in parallel, input signals are output of a voltage detection unit and output of a first multiplier, and a multiplier function is realized by piecewise approximation of the first transconductance amplifier gm1, the second transconductance amplifier gm2, the third transconductance amplifier gm3 and the fourth transconductance amplifier gm 4.
The output signal of the first multiplier 5 is input to an error amplifier U1, compared with a reference voltage, and the generated error signal is used to adjust the comparison point of a comparator U2, and further adjust the voltage of a first resistor R1, thereby changing the current of a primary winding L1. The output voltage of the error amplifier U1 reflects the magnitude of the output power, the higher the output voltage of the error amplifier U1 is, the higher the voltage of the positive terminal transmitted to the input terminal of the comparator U2 is, and when the voltage of the first resistor exceeds the voltage of the positive phase input terminal of the comparator U2, the comparator U2 is inverted to a low level, so that the logic control unit 2 is enabled to output the low level, the power tube Q is turned off, and the energy storage is finished.
When the average voltage value output by the first multiplier 5 is higher than the reference voltage, it indicates that the power output by the constant-power output circuit is large, and at this time, the output of the error amplifier U1 is reduced, so that the current of the primary winding L1 is reduced, and further, the output current is reduced, so that the power output by the constant-power output circuit can be reduced; on the contrary, when the average voltage value output by the first multiplier 5 is lower than the reference voltage, it indicates that the power output by the constant power output circuit is smaller, and at this time, the output of the error amplifier U1 increases, the current of the primary winding L1 is increased, and further the output current is increased, so that the power output by the constant power output circuit can be increased, and the requirement of constant output power is met. In this embodiment, the average voltage value is Vout, the number of turns of the primary winding L1 is n1, the number of turns of the secondary winding is n2, the number of turns of the auxiliary winding L3 is n3, the voltage output by the sample-and-hold unit 1 is Vc, the voltage output by the second multiplier 6 is Vb, the output voltage of the first multiplier 5 is Va, the demagnetization duty ratio of the secondary winding L2 is D1, the input voltage of the voltage detection unit 3 is Vdet, and the output voltage of the voltage detection unit 3 is Vdet 1. The peak current of the primary winding L1 is I1, the peak current of the secondary winding L2 is I2, the output current of the constant power output circuit is Iout, and the output power of the constant power output circuit is P.
Iout＝∫(I2×D1)dt (1)
P＝Vout×Iout (2)
I2＝(I1×n1)/n2 (3)
I1＝Vc/Rcs (4)
Vb＝∫(Vc×D1)dt (5)
Vdet＝(Vout×n3×R2)/(n2×(R1+R2)) (6)
Va＝∫(Vdet×Vb)dt (7)
Va＝V1 (8)
The following can be obtained from the above formula (1-8): p ═ (V1 × n1 × (R1+ R2))/(Rcs × n3 × R2);
therefore, the constant power output circuit in the embodiment can realize stable constant output.
In summary, in the constant power output circuit provided by the invention, the error signal generated by the error amplifier adjusts the voltage of the first resistor through the comparator, so that the current on the primary winding is changed, the effect of constant current in the constant power output circuit is achieved, the fluctuation range of the output power is reduced, and the stability of the constant power output circuit is improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (6)
1. A constant power output circuit, characterized by: the detection circuit comprises a primary winding, a secondary winding, an auxiliary winding, a power tube, a first resistor, a sampling and holding unit, an error amplifier, a comparator, a detection unit and a logic control unit, wherein the primary winding and the auxiliary winding are respectively coupled with the secondary winding, the primary winding is respectively connected with one end of the logic control unit, the input end of the sampling and holding unit, the inverting input end of the comparator and the first resistor through the power tube, the input end of the detection unit is respectively connected with the sampling and holding unit and the auxiliary winding, the output end of the detection unit is connected with the inverting input end of the comparator through the error amplifier, and the output end of the comparator is connected with the other end of the logic control unit.
2. The constant power output circuit according to claim 1, wherein: the detection unit comprises a voltage detection unit, a time detection unit, a first multiplier and a second multiplier, the auxiliary winding is connected with the first input end of the first multiplier through the voltage detection unit, the auxiliary winding is connected with the first input end of the second multiplier through the time detection unit, the second input end of the second multiplier is connected with the sample and hold unit, the output end of the second multiplier is connected with the second input end of the first multiplier, and the output end of the first multiplier is connected with the positive phase input end of the comparator through the error amplifier.
3. The constant power output circuit of claim 2, wherein: the output end of the first multiplier is connected to the positive phase input end of the error amplifier, and the negative phase input end of the error amplifier is provided with a reference voltage.
4. The constant power output circuit according to claim 1, wherein: one end of the first resistor is connected with the power tube, and the other end of the first resistor is grounded.
5. The constant power output circuit according to claim 1, wherein: the voltage detection circuit further comprises a second resistor and a third resistor, one end of the auxiliary winding is grounded, the other end of the auxiliary winding is grounded through the second resistor and the third resistor which are connected in series, and the joint of the second resistor and the third resistor is connected with the voltage detection unit and the time detection unit respectively.
6. The constant power output circuit according to claim 1, wherein: the discharging circuit comprises a diode, a capacitor and a fourth resistor, the diode and the fourth resistor are connected in series and on the secondary winding, and the fourth resistor is connected in parallel with the capacitor.
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| CN201911153530.9A CN110829799A (en) | 2019-11-22 | 2019-11-22 | Constant power output circuit |
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| CN201911153530.9A CN110829799A (en) | 2019-11-22 | 2019-11-22 | Constant power output circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011120374A (en) * | 2009-12-03 | 2011-06-16 | Shindengen Electric Mfg Co Ltd | Constant current power supply device |
| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| US20160020691A1 (en) * | 2014-07-15 | 2016-01-21 | Dialog Semiconductor Inc. | Hysteretic Power Factor Control Method for Single Stage Power Converters |
| CN105406723A (en) * | 2015-12-24 | 2016-03-16 | 杭州士兰微电子股份有限公司 | Constant power control circuit and driving system containing same |
| CN206250994U (en) * | 2016-12-16 | 2017-06-13 | 深圳市群芯科创电子有限公司 | A kind of AC DC power supply circuits |
| CN108365757A (en) * | 2018-03-27 | 2018-08-03 | 深圳市群芯科创电子有限公司 | A kind of constant-current device |
-
2019
- 2019-11-22 CN CN201911153530.9A patent/CN110829799A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011120374A (en) * | 2009-12-03 | 2011-06-16 | Shindengen Electric Mfg Co Ltd | Constant current power supply device |
| CN103731033A (en) * | 2013-12-19 | 2014-04-16 | 山东艾诺仪器有限公司 | Wide-range DC power supply with constant power output characteristic |
| US20160020691A1 (en) * | 2014-07-15 | 2016-01-21 | Dialog Semiconductor Inc. | Hysteretic Power Factor Control Method for Single Stage Power Converters |
| CN105406723A (en) * | 2015-12-24 | 2016-03-16 | 杭州士兰微电子股份有限公司 | Constant power control circuit and driving system containing same |
| CN206250994U (en) * | 2016-12-16 | 2017-06-13 | 深圳市群芯科创电子有限公司 | A kind of AC DC power supply circuits |
| CN108365757A (en) * | 2018-03-27 | 2018-08-03 | 深圳市群芯科创电子有限公司 | A kind of constant-current device |
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