CN113489317B - Program-controlled output power control circuit - Google Patents
Program-controlled output power control circuit Download PDFInfo
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- CN113489317B CN113489317B CN202110574726.6A CN202110574726A CN113489317B CN 113489317 B CN113489317 B CN 113489317B CN 202110574726 A CN202110574726 A CN 202110574726A CN 113489317 B CN113489317 B CN 113489317B
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a program-controlled output power control circuit, which belongs to the technical field of switch power supply output power control circuits, and can realize the effective control function of power output, ensure that the output power is always and accurately controlled in the range from the lower power limit to the upper power limit, and ensure that the control circuit is very stable and reliable. Compared with the traditional output power control circuit, the circuit has incomparable superiority, so that the program control performance, accuracy and other aspects of the output power control circuit are improved in a breakthrough manner, and the automatic parallel control capability of the switching power supply is effectively improved.
Description
Technical Field
The invention belongs to the technical field of switching power supply output power control circuits, and particularly relates to a program-controlled output power control circuit.
Background
With the development of high-power load demands and distributed power supply systems, the importance of the switching power supply parallel technology is increasing. Certain current equalizing measures are needed to be adopted among the parallel switch converter modules, which is the key for realizing a high-power supply system and is used for ensuring the relatively uniform distribution of current stress and thermal stress among the modules and preventing one or more modules from operating in a current limit state or a thermal stress limit state. Because the characteristics of the modules running in parallel are not consistent, the modules with good external characteristics can bear more current and even overload; modules with poor external characteristics can only withstand low currents, even half-loads. Thereby causing uneven distribution of thermal stress, affecting the service life and reliability of the power module, and even making normal operation difficult. Therefore, the power supply output power control technology is necessarily a key technology of a parallel system, and has important research value. The power supply output power control technique becomes a key to realizing a combined high-power supply system.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a program-controlled output power control circuit which is reasonable in design, overcomes the defects in the prior art and has good effect; the output power of the switching power supply can be effectively controlled, so that the output power is always and accurately controlled in the range from the lower power limit to the upper power limit, the automatic parallel connection function of the switching power supply is conveniently realized, and the switching power supply is widely applied to various switching power supplies such as AC/DC, DC/DC and the like.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a program-controlled output power control circuit comprises a current detection and zero compensation circuit, a differential amplification circuit, a signal integration circuit, a power upper limit control circuit, a power lower limit control circuit and an isolation driving control circuit;
a current detection and zero compensation circuit configured to detect a primary current of the output power by current detection, converting a current signal into a voltage signal; zero point compensation is adopted, so that the zero point problem caused by the interference of ground noise of the detected current is avoided;
the differential amplifying circuit is configured to perform differential amplification on the output voltage signal of the current detection and zero compensation circuit to generate a voltage signal;
the signal integration circuit is configured to carry out integration compensation on the differential amplifying circuit so as to realize reliable control of power;
the power upper limit control circuit is configured to carry out program control operation control on the upper limit of the output power so as to accurately determine the maximum output power;
the power lower limit control circuit is configured to carry out program control operation control on the lower limit of the output power so as to accurately determine the minimum output power;
and an isolation drive control circuit configured to generate an isolation drive control signal, i.e., to always control the output power within a range from a lower power limit to an upper power limit.
Preferably, the current detection and zero compensation circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a first diode; one end of the first resistor and the anode of the first diode form a common end and are connected to I_Sense (current detection signal), the other end of the first resistor is grounded, the cathode of the first diode is connected to the anode of the first capacitor, one end of the second resistor, one end of the third resistor and one end of the fourth resistor, the cathode of the first capacitor and the other end of the third resistor form a common end and are grounded, and the other end of the second resistor is connected to a +3.3V power supply.
Preferably, the differential amplifying circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a first integrated circuit, wherein the other end of the fourth resistor is connected to one end of the fifth resistor, one end of the second capacitor and 3 pins of the first integrated circuit, the other end of the fifth resistor and the other end of the second capacitor form a common ground, one end of the sixth resistor is grounded, the other end of the sixth resistor is connected to one end of the seventh resistor, one end of the third capacitor and 2 pins of the first integrated circuit, the other end of the seventh resistor and the other end of the third capacitor form a common terminal connected to 1 pin of the first integrated circuit and one end of the eighth resistor, the 8 pins of the first integrated circuit and one end of the fourth capacitor form a common terminal connected to +5v power supply, the other end of the fourth capacitor is grounded, the 4 pins of the first integrated circuit and one end of the fifth capacitor form a common terminal connected to-5v power supply, and the other end of the fifth capacitor is grounded.
Preferably, the signal integrating circuit comprises an eighth resistor and a sixth capacitor, wherein the other end of the eighth resistor is connected to one end of the sixth capacitor, one end of the eleventh resistor and one end of the fifteenth resistor, and the other end of the sixth capacitor is grounded.
Preferably, the power upper limit control circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh capacitor, and a first unit of the second integrated circuit, one end of the ninth resistor is connected to h_prog (power upper limit control signal), the other end of the ninth resistor is connected to one end of the tenth resistor, one end of the twelfth resistor, one end of the seventh capacitor, and 3 pins of the second integrated circuit, the other end of the tenth resistor and the other end of the seventh capacitor form a common ground, the other end of the eleventh resistor is connected to 2 pins of the second integrated circuit, 1 pin of the second integrated circuit is connected to 7 pins of the second unit of the second integrated circuit, the other end of the twelfth resistor, one end of the sixteenth resistor, one end of the seventeenth resistor, one end of the ninth capacitor, a base of the second triode, and an anode of the third voltage regulator, and 4 pins of the second integrated circuit are grounded.
Preferably, the power lower limit control circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an eighth capacitor, a second unit of the second integrated circuit, one end of the thirteenth resistor is connected to l_prog (power lower limit control signal), the other end of the thirteenth resistor is connected to one end of the fourteenth resistor, one end of the eighth capacitor and 6 pins of the second unit of the second integrated circuit, the other end of the fourteenth resistor and the other end of the eighth capacitor constitute a common ground, and the other end of the fifteenth resistor is connected to the other end of the sixteenth resistor and 5 pins of the second unit of the second integrated circuit.
Preferably, the isolation driving control circuit comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a ninth capacitor, a second triode, a third voltage stabilizing tube and a first photoelectric coupler, wherein a common end formed by the other end of the seventeenth resistor and one end of the eighteenth resistor is connected to a +5V power supply, the other end of the eighteenth resistor is connected to a 1 pin of the first photoelectric coupler, a common end formed by an emitter of the second triode and a cathode of the third voltage stabilizing tube is connected to a 2 pin of the first photoelectric coupler, a common end formed by the other end of the ninth capacitor and a collector of the second triode is grounded, one end of the nineteenth resistor is connected to a +5V2 power supply, a common end formed by the other end of the nineteenth resistor, a 5 pin of the first photoelectric coupler and a 6 pin of the first photoelectric coupler are connected to a P_Ctrl (power control signal), and the 6 pin of the first photoelectric coupler is connected to +5V2 power supply ground.
The invention has the beneficial technical effects that:
1. by adopting the zero compensation technology, the zero problem caused by the interference of ground noise of the detection current can be effectively avoided, and the reliability of power control is improved.
2. By adopting the differential amplification circuit technology, the accuracy of current detection and zero compensation can be effectively improved, and the accuracy of power control is further improved.
3. By adopting the signal integration circuit technology, the stability of current detection and zero point compensation can be effectively improved, and the stability of power control is further improved.
4. By adopting the synchronous program control circuit technology of the upper power limit and the lower power limit, the program control of the output power can be achieved, and the parallel control capability of the power supply is improved.
5. The isolation driving control circuit technology is adopted, so that the isolation control of strong and weak current is facilitated, and the power control is simpler and more reliable.
The invention relates to a novel program-controlled output power control circuit and a method, in particular to a synchronous program-controlled control circuit and a method adopting an upper power limit and a lower power limit; the circuit not only can realize the effective control function of power output, but also can ensure that the output power is always and accurately controlled within the range from the lower power limit to the upper power limit, and the control circuit is very stable and reliable; compared with the traditional output power control circuit, the circuit has incomparable superiority, so that the program control performance, accuracy and other aspects of the output power control circuit are improved in a breakthrough manner, and the automatic parallel control capability of the switching power supply is effectively improved.
Drawings
Fig. 1 is a block circuit diagram of the method of the present invention.
Fig. 2 is a circuit configuration diagram of the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
referring to fig. 1, the present invention detects a primary current of an output power through a current detection and zero compensation circuit, converts a current signal into a voltage signal, and compensates for a zero point at the same time; the output voltage signal of the current detection and zero compensation circuit is subjected to differential amplification through a differential amplification circuit, so that a larger accurate voltage signal is generated; the differential amplifying circuit is subjected to integral compensation through the signal integrating circuit; the output signal of the signal integrating circuit and the program-controlled upper limit reference signal of the output power are subjected to operation control through the upper power limit control circuit, and an upper output power limit control signal is generated; the output signal of the signal integrating circuit and the program control lower limit reference signal of the output power are subjected to operation control through the power lower limit control circuit, and an output power lower limit control signal is generated; and the isolation driving control circuit is used for generating an isolation driving control signal of the output power, so that the output power is accurately controlled within the range from the lower power limit to the upper power limit all the time.
Referring to fig. 2, a programmable output power control circuit mainly includes a current detection and zero compensation circuit, a differential amplifying circuit, a signal integrating circuit, a power upper limit control circuit, a power lower limit control circuit, an isolation driving control circuit, and the like.
As shown in fig. 2, for the current detection and zero point compensation circuit, the current detection and zero point compensation circuit is constituted by a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a diode V1. The primary current of the output power is detected, the current signal is converted into a voltage signal, and the zero point is compensated.
As shown in fig. 2, the differential amplifier circuit is composed of a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C3, and an integrated circuit N1A. And carrying out differential amplification on the output voltage signal of the current detection and zero compensation circuit to generate a larger accurate voltage signal.
As shown in fig. 2, the signal integrating circuit is constituted by a resistor R8 and a capacitor C6, and integrates and compensates the differential amplifying circuit. And performing program control operation control on the upper limit of the output power to accurately determine the maximum output power.
As shown in fig. 2, the power upper limit control circuit is constituted by a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C7, and an integrated circuit N2A. And performing operation control on the output signal of the signal integrating circuit and a program control upper limit reference signal of the output power to generate an output power upper limit control signal.
As shown in fig. 2, for the lower power limit control circuit, the lower power limit control circuit is constituted by a resistor R13, a resistor R14, a resistor R15, a resistor R16, a capacitor C8, and an integrated circuit N2B. And performing operation control on the output signal of the signal integrating circuit and a program control lower limit reference signal of the output power to generate an output power lower limit control signal.
As shown in fig. 2, for the isolation drive control circuit, the isolation drive control circuit is constituted by a resistor R17, a resistor R18, a resistor R19, a transistor V2, a regulator V3, and a photocoupler E1. The function of the power supply is to generate an isolated driving control signal of the output power, and finally, the output power is always accurately controlled within the range from the lower power limit to the upper power limit.
The output power range of the program-controlled output power control circuit designed based on the invention is as wide as 10W-2000W; in the maximum output power state, the accuracy of the output power control is as high as +/-0.1%.
In conclusion, the circuit has higher program control and accuracy and breakthrough improvement. The output power of the switching power supply can be effectively controlled in a controlled manner, so that the output power is always and accurately controlled in the range from the lower power limit to the upper power limit, and the automatic parallel connection function of the switching power supply is conveniently realized.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (2)
1. A programmable output power control circuit, characterized by: the device comprises a current detection and zero compensation circuit, a differential amplification circuit, a signal integration circuit, a power upper limit control circuit, a power lower limit control circuit and an isolation driving control circuit;
a current detection and zero compensation circuit configured to detect a primary current of the output power by current detection, converting a current signal into a voltage signal; zero point compensation is adopted, so that the zero point problem caused by the interference of ground noise of the detected current is avoided;
the differential amplifying circuit is configured to perform differential amplification on the output voltage signal of the current detection and zero compensation circuit to generate a voltage signal;
the signal integration circuit is configured to carry out integration compensation on the differential amplifying circuit so as to realize reliable control of power;
the power upper limit control circuit is configured to carry out program control operation control on the upper limit of the output power so as to accurately determine the maximum output power;
the power lower limit control circuit is configured to carry out program control operation control on the lower limit of the output power so as to accurately determine the minimum output power;
an isolation drive control circuit configured to generate an isolation drive control signal, i.e., to always control the output power within a range from a lower power limit to an upper power limit;
the current detection and zero compensation circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a first diode; one end of the first resistor and the anode of the first diode form a common end and are connected to the I_Sense, the other end of the first resistor is grounded, the cathode of the first diode is connected to the anode of the first capacitor, one end of the second resistor, one end of the third resistor and one end of the fourth resistor, the cathode of the first capacitor and the other end of the third resistor form a common end and are grounded, and the other end of the second resistor is connected to a +3.3V power supply;
the differential amplifying circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a first integrated circuit, wherein the other end of the fourth resistor is connected to one end of the fifth resistor, one end of the second capacitor and 3 pins of the first integrated circuit, the other end of the fifth resistor and the other end of the second capacitor form a common ground, one end of the sixth resistor is grounded, the other end of the sixth resistor is connected to one end of the seventh resistor, one end of the third capacitor and 2 pins of the first integrated circuit, the other end of the seventh resistor and the other end of the third capacitor form a common end and are connected to 1 pin of the first integrated circuit and one end of an eighth resistor, the 8 pin of the first integrated circuit and one end of the fourth capacitor form a common end and are connected to +5V power supply, the other end of the fourth capacitor is grounded, the 4 pin of the first integrated circuit and one end of the fifth capacitor form a common end and are connected to-5V power supply, and the other end of the fifth capacitor is grounded;
the signal integrating circuit comprises an eighth resistor and a sixth capacitor, the other end of the eighth resistor is connected to one end of the sixth capacitor, one end of the eleventh resistor and one end of the fifteenth resistor, and the other end of the sixth capacitor is grounded;
the power upper limit control circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a seventh capacitor and a first unit of a second integrated circuit, wherein one end of the ninth resistor is connected to H_prog, the other end of the ninth resistor is connected to one end of the tenth resistor, one end of the twelfth resistor, one end of the seventh capacitor and 3 pins of the second integrated circuit, the other end of the tenth resistor and the other end of the seventh capacitor form a common ground, the other end of the eleventh resistor is connected to 2 pins of the second integrated circuit, 1 pin of the second integrated circuit is connected to 7 pins of the second unit of the second integrated circuit, the other end of the twelfth resistor, one end of the sixteenth resistor, one end of the seventeenth resistor, one end of the ninth capacitor, a base electrode of a second triode and an anode of a third voltage regulator tube, and 4 pins of the second integrated circuit are grounded;
the power lower limit control circuit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an eighth capacitor and a second unit of the second integrated circuit, one end of the thirteenth resistor is connected to L_prog, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor, one end of the eighth capacitor and 6 pins of the second unit of the second integrated circuit, the other end of the fourteenth resistor and the other end of the eighth capacitor form a common ground, and the other end of the fifteenth resistor is connected to the other end of the sixteenth resistor and 5 pins of the second unit of the second integrated circuit.
2. The programmable output power control circuit of claim 1, wherein: the isolation driving control circuit comprises a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a ninth capacitor, a second triode, a third voltage stabilizing tube and a first photoelectric coupler, wherein a common end formed by the other end of the seventeenth resistor and one end of the eighteenth resistor is connected to a +5V power supply, the other end of the eighteenth resistor is connected to a 1 pin of the first photoelectric coupler, a common end formed by an emitter of the second triode and a cathode of the third voltage stabilizing tube is connected to a 2 pin of the first photoelectric coupler, a common end formed by the other end of the ninth capacitor and a collector of the second triode is grounded, one end of the nineteenth resistor is connected to a +5V2 power supply, a common end formed by the other end of the nineteenth resistor, a 5 pin of the first photoelectric coupler and a 6 pin of the first photoelectric coupler are connected to P_Ctrl, and the 6 pin of the first photoelectric coupler is grounded.
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| CN202110574726.6A CN113489317B (en) | 2021-05-26 | 2021-05-26 | Program-controlled output power control circuit |
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| CN202110574726.6A CN113489317B (en) | 2021-05-26 | 2021-05-26 | Program-controlled output power control circuit |
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| CN210444174U (en) * | 2019-08-21 | 2020-05-01 | 深圳市嘉兆鸿电子有限公司 | Self-adaptive following type program-controlled power supply |
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| TWI463768B (en) * | 2012-10-19 | 2014-12-01 | Ite Tech Inc | Dc-to-dc converter |
| CN103499736B (en) * | 2013-10-22 | 2016-08-31 | 重庆长安汽车股份有限公司 | Over-current detection circuit and current foldback circuit |
| CN104485908B (en) * | 2014-11-14 | 2017-06-20 | 河北高达电子科技有限公司 | 1000W digital power amplifiers |
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| CN109994987B (en) * | 2017-12-29 | 2022-07-22 | 比亚迪汽车工业有限公司 | Over-current protection circuit based on CPLD and over-current protection method thereof |
| CN108445947B (en) * | 2018-05-21 | 2023-05-02 | 广州大学 | Quick transient response circuit applied to DC-DC converter chip |
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| CN210444174U (en) * | 2019-08-21 | 2020-05-01 | 深圳市嘉兆鸿电子有限公司 | Self-adaptive following type program-controlled power supply |
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