CN113162441A - Isolated power supply circuit, primary and secondary side communication control circuit and control method - Google Patents
Isolated power supply circuit, primary and secondary side communication control circuit and control method Download PDFInfo
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
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Abstract
The invention discloses an isolation power supply circuit, an original secondary side communication control circuit and a control method. The secondary side control circuit is used for carrying out digital signal coding processing on the setting information and generating a modulation signal according to the digital signal coding processing; when the primary side and the secondary side communicate, the secondary side control circuit generates a driving pulse signal for controlling the conducting state of the synchronous rectifier tube by using the modulation signal and the synchronous rectifier control signal in one switching period of the isolation power supply circuit. The primary side control circuit is used for extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal. The isolation power supply circuit, the primary and secondary side communication control circuit and the control method can save expensive optical couplers and other communication elements and are suitable for various working modes such as DCM, CCM, CRM and the like; in addition, the invention can transmit various information and improve the diversity of information transmission.
Description
Technical Field
The invention belongs to the technical field of isolated power supplies, relates to an isolated power supply circuit, and particularly relates to an original secondary side communication control circuit and a control method.
Background
The isolation power supply needs to meet the requirement of safety regulation insulation, and the original secondary side cannot be directly electrically connected; however, the primary side and the secondary side have communication requirements for transmitting control information, protection information or configuration information of the circuit. The optical coupler is the most common original secondary side communication element at present, and converts electric quantity (current) into luminous flux firstly and then converts the luminous flux into electric quantity (current); the device has the characteristics of electrical isolation and can meet the communication requirement.
Flyback (commonly known as single-ended Flyback DC-DC converter) is one type of isolated power supply. Fig. 1 is a schematic diagram of a conventional Flyback converter using an optocoupler as a primary and secondary communication element; as shown in fig. 1, in the isolated power supply with the optical coupler 100, the optical coupler has a large volume and a high cost. In addition, in the isolation power supply without the optical coupler, only the output voltage can be transmitted, the transmission information is single, and the requirements of people on the original and secondary side communication transmission information of the isolation power supply cannot be met.
In view of the above, there is a need to design a new primary-secondary communication method to overcome the above-mentioned drawbacks of the existing primary-secondary communication method.
Disclosure of Invention
The invention provides an isolated power supply circuit, an original secondary side communication control circuit and a control method, which can save expensive communication elements such as an optical coupler and the like, can transmit various information and improve the diversity of information transmission.
In order to solve the technical problem, according to one aspect of the present invention, the following technical solutions are adopted:
the invention discloses an original secondary side communication control circuit, which comprises:
the secondary side control circuit is used for carrying out digital signal coding processing on the setting information and generating a modulation signal; when the primary side and the secondary side communicate, the secondary side control circuit generates a driving pulse signal by using the modulation signal and a synchronous rectification control signal in a switching period of the isolation power supply circuit, and the driving pulse signal is used for controlling the conduction state of the synchronous rectification tube; and
and the primary side control circuit is used for extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal.
As an embodiment of the present invention, the secondary side control circuit includes:
the digital signal coding circuit is used for carrying out digital signal coding processing on the setting information;
the input end of the modulation wave generating circuit is coupled with the output end of the digital signal coding circuit and is used for generating a modulation signal according to the signal processed by the digital signal coding circuit;
the synchronous rectification control circuit is used for outputting a synchronous rectification control signal; and
and the input end of the driving pulse generating circuit is respectively coupled with the output end of the synchronous rectification control circuit and the output end of the modulation wave generating circuit and used for generating a driving pulse signal according to the synchronous rectification control signal and the modulation signal.
As an embodiment of the present invention, the primary side control circuit includes:
the digital signal extraction circuit is used for extracting a digital signal from the acquired setting information;
the input end of the digital signal decoding circuit is coupled with the output end of the digital signal extracting circuit and is used for decoding the digital signal extracted by the digital signal extracting circuit; and
and the input end of the pulse control circuit is coupled with the output end of the digital signal decoding circuit and is used for acquiring the digital signal decoded by the digital signal decoding circuit and acquiring corresponding information according to the decoded digital signal to generate a pulse signal so as to control the conduction state of the primary side switching tube.
As an embodiment of the present invention, the primary side control circuit collects signals of set positions of the primary side winding or/and the auxiliary winding; under the coupling action of the transformer, the primary side control circuit acquires a detection signal representing the setting information, and the detection signal can reflect and control the change of a driving pulse signal of the synchronous rectifier tube.
As an embodiment of the present invention, the secondary side control circuit further includes an oscillator, an output end of which is coupled to an input end of the modulated wave generating circuit, and the modulated wave generating circuit adjusts a period or/and a frequency of a modulated wave thereof through the oscillator and generates a modulated signal according to the encoded signal;
ensure Nbit Tchop < Tdem; wherein Nbit is the digit of the digital signal, Tchop is the modulation wave period, and Tdem is the pulse width of the synchronous rectification control signal.
As an embodiment of the present invention, the secondary side control circuit further includes a micro control unit, and the micro control unit is configured to perform digital signal encoding processing on the setting information, and generate a modulation signal according to the digital signal encoding processing.
As an embodiment of the present invention, the secondary control circuit further includes a secondary driving circuit, an input terminal of the secondary driving circuit is coupled to the output terminal of the driving pulse generating circuit, and an output terminal of the secondary driving circuit is coupled to the synchronous rectifier.
As an embodiment of the present invention, an input end of the digital signal encoding circuit is coupled to the setting information, the setting information includes at least one of a protection signal, control quantity acquisition information, and system end configuration information, and the digital signal encoding circuit performs digital signal encoding processing on the setting information.
As an embodiment of the present invention, the driving pulse generating circuit includes an and gate; the input end of the AND gate is respectively coupled with the output end of the synchronous rectification control circuit and the output end of the modulation wave generating circuit, and the output end of the AND gate outputs the driving pulse signal.
As an embodiment of the present invention, the primary side control circuit further includes a primary side driving circuit, an input end of which is coupled to the output end of the pulse control circuit, and an output end of the primary side driving circuit is coupled to the primary side switching tube.
As an embodiment of the present invention, the digital signal extraction circuit includes a differentiation circuit for converting the rectangular pulse signal into a spike pulse signal, i.e., generating a spike pulse signal at a rising edge and a falling edge of the rectangular pulse signal, thereby effectively identifying the corresponding signal.
In an embodiment of the present invention, the digital signal analyzed by the digital signal decoding circuit includes at least one of the following information:
the protection information comprises at least one of overvoltage information, overcurrent information and overtemperature information;
parameter configuration information corresponding to configuration information of the load end system on the output voltage and/or the output current of the isolated power supply circuit; and
the control quantity acquisition information comprises at least one of output voltage of the isolation power supply circuit, analog quantity of output current and variation trend of the output voltage or the output current.
The invention discloses an isolation power supply circuit which comprises the original secondary side communication control circuit.
As an embodiment of the present invention, the isolated power supply circuit further includes a transformer, a primary side switching tube located on the primary side, and a synchronous rectifier tube located on the secondary side; the transformer comprises a primary winding and a secondary winding;
the primary side control circuit is coupled with the primary side switching tube, and the output end of the secondary side control circuit is coupled with the synchronous rectifying tube.
The invention discloses an original secondary side communication control method, which comprises the following steps:
step S1, carrying out digital signal coding processing on the setting information, and generating a modulation signal according to the digital signal coding processing; when the primary side and the secondary side communicate, a driving pulse signal for controlling the conducting state of the synchronous rectifier tube is generated by utilizing the modulation signal and a synchronous rectifier control signal in a switching period of the isolation power supply circuit; and
and step S2, extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal.
As an embodiment of the present invention, the step S1 specifically includes:
step S11, digital signal coding processing is carried out on the setting information;
step S12, generating a modulation signal according to the signal after the digital signal coding processing;
step S13, generating a driving pulse signal according to the synchronous rectification control signal and the modulation signal; and
in step S14, a secondary drive signal capable of controlling the conduction state of the synchronous rectifier is generated based on the drive pulse signal.
As an embodiment of the present invention, the step S2 specifically includes:
step S21, extracting digital signals from the collected detection signals representing the setting information;
step S22, decoding the extracted digital signal;
step S23, acquiring the decoded digital signal, and acquiring corresponding information according to the decoded digital signal to generate a corresponding pulse signal; and
and step S24, outputting a primary side driving signal to control the conduction state of the primary side switching tube.
The invention has the beneficial effects that: the isolation power supply circuit, the primary and secondary side communication control circuit and the control method can save expensive optical couplers and other communication elements and are suitable for various working modes such as DCM, CCM, CRM and the like; in addition, the invention can transmit various information and improve the diversity of information transmission.
Based on the existing power circuit without communication elements such as an optical coupler, the original secondary side communication mode of the invention can bear more information (a plurality of bits), while the prior art can only transmit whether the overvoltage is excessive (1 bit). In the prior art, the pulse width variation trend of a pulse signal is adopted to represent the height of an output voltage, but the pulse width of the invention is not changed, and more information can be transmitted through chopping and digital coding in one switching period.
Drawings
Fig. 1 is a circuit schematic diagram of an original secondary side communication mode of a conventional isolated power supply circuit.
Fig. 2 is a circuit diagram of an original secondary communication control circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a secondary side control circuit according to an embodiment of the invention.
FIG. 4 is a timing diagram of some signals according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of the components of the primary side control circuit according to an embodiment of the invention.
FIG. 6 is a diagram illustrating an application of an SR controller according to an embodiment of the present invention.
FIG. 7 is a timing diagram of some signals according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.
"coupled" or "connected" in this specification includes both direct and indirect connections, such as through some active device, passive device, or electrically conductive medium; but also may include connections through other active or passive devices, such as through switches, follower circuits, etc., that are known to those skilled in the art for achieving the same or similar functional objectives.
The invention discloses an original secondary side communication control circuit which comprises a secondary side control circuit and a primary side control circuit. The secondary side control circuit is used for carrying out digital signal coding processing on the setting information and generating a modulation signal according to the digital signal coding processing; when the primary side and the secondary side communicate, the secondary side control circuit generates a driving pulse signal for controlling the conducting state of the synchronous rectifier tube by using the modulation signal and a synchronous rectifier control signal in a switching period of the isolation power supply circuit. The primary side control circuit is used for extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal. The setting information may be a protection signal of the protection module, control quantity acquisition information, system end configuration information, and the like. In the original secondary side communication process, one or more pieces of information in the setting information can be targeted. In an embodiment of the present invention, the secondary side control circuit further includes a micro control unit, and the micro control unit is configured to perform digital signal encoding processing on the setting information, and generate a modulation signal according to the digital signal encoding processing.
FIG. 2 is a circuit diagram of an original secondary communication control circuit according to an embodiment of the present invention; referring to fig. 2, in an embodiment of the present invention, the primary and secondary communication control circuits of the present invention are used in a typical Flyback power circuit, and include a PWM controller 10 and an SR controller 20 (i.e., a synchronous rectification control circuit). The PWM controller 10 may or may not include a primary side switching transistor Q1, and the primary side switching transistor Q1 may be a field effect transistor MOSFET or a bipolar transistor BJT. SR controller 20 may or may not include a synchronous rectifier (which may be a MOSFET). In an embodiment of the present invention, the primary and secondary communication control circuits of the present invention add communication components in the PWM controller 10 and the SR controller 20; the method comprises the steps of carrying out chopping modulation on an SR synchronous rectification control signal, superposing a high-frequency digital communication signal on the SR control signal with a switching frequency, and transmitting the digital signal from a secondary side to a primary side by utilizing a transformer circuit principle. In one embodiment, the process of transmitting the digital signal from the secondary side to the primary side may be: the transmission representation of the electric signal on the secondary winding is transmitted to the primary winding, and the digital signal is obtained by a primary PWM (pulse width modulation) controller by acquiring the electric signal of the primary winding (acquiring a Drain end signal of a primary switching tube Q1); alternatively, as shown in fig. 2, the electrical signal transmission on the secondary winding is characterized to the auxiliary winding, and the primary PWM controller obtains a digital signal by collecting the electrical signal on the auxiliary winding.
FIG. 3 is a schematic diagram of a secondary control circuit according to an embodiment of the present invention; referring to fig. 3, in an embodiment of the present invention, the secondary side control circuit 1 includes: a digital signal encoding circuit 11, a synchronous rectification control circuit 12, a modulation wave generating circuit 13, and a drive pulse generating circuit 14. In an embodiment, the secondary control circuit 1 may further include a secondary driving circuit 15.
The digital signal encoding circuit 11 is configured to perform digital signal encoding processing on the setting information. In an embodiment, the input end of the digital signal encoding circuit 11 is respectively coupled to at least one of the protection signal, the control quantity acquisition information and the system end configuration information, and performs digital signal encoding processing on at least one of the protection signal, the control quantity acquisition information and the system end configuration information. The synchronous rectification control circuit 12 is configured to output a synchronous rectification control signal. In one embodiment, the driving pulse generating circuit 14 is configured to perform chopper modulation on the synchronous rectification control signal, and superimpose a digital communication signal on the synchronous rectification control signal with the switching frequency; and transmitting the digital communication signal from the secondary winding to the primary winding or/and the auxiliary winding for the acquisition of the primary control circuit. In an embodiment, an input terminal of the modulated wave generating circuit 13 is coupled to the output terminal of the digital signal encoding circuit 11, and is used for generating a modulated signal according to the signal processed by the digital signal encoding circuit 11. The input end of the driving pulse generating circuit 14 is coupled to the output end of the synchronous rectification control circuit 12 and the output end of the modulated wave generating circuit 13, respectively, for generating a driving pulse signal according to the synchronous rectification control signal output by the synchronous rectification control circuit 12 and the modulated signal generated by the modulated wave generating circuit 13. In one embodiment, the driving pulse generating circuit 13 includes an and gate 140 (see fig. 6); the input end of the and gate 140 is coupled to the output end of the synchronous rectification control circuit 12 and the output end of the modulated wave generating circuit 13, respectively, and the output end of the and gate 140 outputs the driving pulse signal. The input end of the secondary driving circuit 15 is coupled to the output end of the driving pulse generating circuit 14, and the secondary driving circuit 15 generates a secondary driving signal capable of controlling the conduction state of the synchronous rectifier according to the driving pulse signal.
In an embodiment, the secondary side control circuit further includes an oscillator 16, an output terminal of the oscillator 16 is coupled to an input terminal of the modulated wave generating circuit 13, and the modulated wave generating circuit 13 adjusts a period or/and a frequency of a modulated wave thereof through the oscillator 16 and generates a modulated signal according to the encoded signal output by the digital signal encoding circuit 11.
Referring to fig. 3, the control process of the secondary control circuit is as follows: at least one of the protection signal, the control quantity acquisition information, the system end configuration information and the like of the protection module is subjected to digital signal coding processing, the coded signal obtained by processing is transmitted to a modulation wave generating circuit, and the digital signal can be not less than two bits (2 bits). The modulated wave generation circuit 13 adjusts its modulated wave period (frequency) by the oscillator 16, and generates a modulated signal from the encoded signal. The drive pulse generating circuit 14 receives a modulation signal and an SR (synchronous rectification) control signal generated by the synchronous rectification control circuit 12, wherein the SR control signal serves as a carrier and is modulated with the modulation signal to generate an SR Gate drive pulse signal. The secondary side drive circuit 15 drives the SR Gate according to the SR Gate drive pulse signal. In an embodiment, the system-side configuration information may be protocol information of the load device (load-side system) and the power device (e.g., a mobile phone fast charging protocol).
FIG. 4 is a timing diagram of some of the signals according to one embodiment of the present invention; referring to fig. 4, in an embodiment of the present invention, the oscillator sets a modulation wave period to Tchop, the digital signal encoding circuit encodes the control quantity acquisition voltage information into a digital signal of 10101, and the modulation wave generating circuit generates a modulation signal according to the modulation wave period and the digital signal. As shown in fig. 4, the drive pulse generating circuit generates an SR Gate signal from the SR control signal and the modulation signal. Ensuring Nbit Tchop < Tdem, wherein Nbit is the digit of the digital signal; tdem is the pulse width of the synchronous rectification control signal and corresponds to the freewheeling stage of F lyback. If the modulation wave period is 200ns, the time for the modulation signal to carry the digital 10101 signal is 1 μ s, and the pulse width of the synchronous rectification control signal should be greater than 1 μ s.
FIG. 5 is a schematic diagram of the components of a primary side control circuit according to an embodiment of the present invention; referring to fig. 5, in an embodiment of the present invention, the primary side control circuit 2 includes: a digital signal extraction circuit 21, a digital signal decoding circuit 22, and a pulse control circuit 23. In one embodiment, the primary side control circuit 2 further includes a primary side driving circuit 24. The digital signal extraction circuit 21 is configured to extract a digital signal from the acquired signal. In one embodiment, the digital signal extraction circuit 21 includes a differentiating circuit for converting the rectangular pulse signal into a spike pulse signal, i.e., a spike pulse signal is generated at both the rising edge and the falling edge of the rectangular pulse signal, so as to effectively identify the corresponding signal. The input terminal of the digital signal decoding circuit 22 is coupled to the output terminal of the digital signal extracting circuit 21 for decoding the digital signal extracted by the digital signal extracting circuit 21. In an embodiment, the digital signal analyzed by the digital signal decoding circuit 22 includes at least one of protection information, parameter configuration information, and control quantity acquisition information. The protection information comprises at least one of overvoltage information OVP, overcurrent information OCP and over-temperature information OTP. The parameter configuration information corresponds to configuration information of the load-end system for the output voltage and/or the output current of the isolated power supply circuit. The control quantity acquisition information comprises at least one of output voltage of the isolation power supply circuit, analog quantity of output current and variation trend of the output voltage or the output current. The input end of the pulse control circuit 23 is coupled to the output end of the digital signal decoding circuit 22, and is configured to obtain the digital signal decoded by the digital signal decoding circuit 22, and obtain corresponding information according to the decoded digital signal, so as to generate a corresponding pulse signal. The acquired corresponding information refers to the setting information to be transmitted in the original secondary side communication process. In an embodiment of the present invention, the pulse control circuit 23 may be a PWM control circuit. The input end of the primary side driving circuit 24 is coupled to the output end of the pulse control circuit, the output end of the primary side driving circuit 24 outputs a primary side driving signal, and the primary side driving signal is used for controlling the conduction state of the primary side switching tube.
In an embodiment of the present invention, the electrical signal on the secondary winding transmits the characterization information to the auxiliary winding or/and the primary winding, and the primary control circuit obtains a digital signal by collecting the electrical signal on the auxiliary winding or/and the primary winding.
In one embodiment, the primary side control circuit collects signals of set positions of a primary side winding or/and an auxiliary winding; under the coupling action of the transformer, the setting information acquired by the primary side control circuit can reflect and control the change of the driving pulse signal of the secondary side winding. In one embodiment of the invention, the primary side control circuit is connected with the primary side switching tube, and the secondary side control circuit is connected with the synchronous rectification switching tube; when the driving pulse signal is in a high level state, the synchronous rectifier tube is conducted; when the driving pulse signal is in a low level state, a body diode in the synchronous rectifying tube is conducted, and when the synchronous rectifying tube is conducted, a corresponding step appears on the voltage between the drain electrode and the source electrode; according to the working principle of the circuit, a voltage step is correspondingly arranged at a set position of a primary side; and the primary side control circuit extracts corresponding digital signals through the digital signal extraction circuit.
FIG. 6 is a diagram illustrating an exemplary application of a synchronous rectification control circuit according to an embodiment of the present invention; referring to fig. 6, in an embodiment of the present invention, the driving pulse signal (SR Gate) controls the switching state of the synchronous rectifier (SR MOSFET), so that the electrical signal of the secondary winding can be controlled; the primary side winding or the auxiliary winding can obtain corresponding change through the coupling effect of the transformer, and the primary side control circuit acquires and decodes through an FB pin (or a Drain end) until the signals are transmitted to the primary side PWM control module. In one embodiment, the control process of the primary side control circuit is specifically as follows: after digital signal extraction and digital signal decoding, the protection module, the system end configuration module and the control quantity electric signal module perform corresponding control adjustment according to the feedback signal of the secondary side, and the original secondary side communication is realized. As shown in fig. 3 and 5, the primary protection signal corresponds to the secondary protection signal, the primary system configuration information corresponds to the secondary system configuration information, and the primary control quantity electric signal corresponds to the secondary control quantity acquisition signal. The protection signal of the protection module can be protection signals such as overvoltage OVP, overcurrent OCP, over-temperature OTP and the like. The parameter configuration information corresponds to configuration information of the load-end system for the output voltage and/or the output current of the isolated power supply circuit. The control quantity acquisition information may be at least one of an output voltage of the isolated power supply circuit, an analog quantity of the output current, and a variation tendency of the output voltage or the output current.
The synchronous rectification control circuit can be a general synchronous rectification Driver (Driver); in the freewheel phase of Flyback, an active drive pulse signal is generated. The digital signal coding module outputs a high-frequency pulse signal (which can be understood as a binary high-low level signal). When the voltage of the synchronous rectification control signal Gate is high, the digital signal coding module is allowed to output a signal, the phase of the modulation signal pulse signal and the synchronous rectification control signal Gate is connected, and a driving pulse signal SR Gate is generated and sent to a Gate pole of the SR MOSFET.
FIG. 7 is a timing diagram of some of the signals according to one embodiment of the present invention; referring to fig. 7, how the digital signal is transferred from the secondary side to the primary side is described with reference to fig. 7. In one embodiment, the synchronous rectifier is a MOSFET (i.e., SR MOSFET).
(1) When no digital signal needs to be transmitted, the Gate is at an active state (high level), the Pulse is also at a high level, the SR Gate signal is the same as the Gate, and the SR MOSFET is always on.
(2) When a digital signal needs to be transmitted, the Gate is in an active state (high level), the Pulse is a high-frequency Pulse sequence, and the SR Gate signal is the same as the Pulse. When the SR gate Is at a high level, the MOSFET Is turned on, and SR Vds ═ Rds _ on ═ Is; wherein Rds _ on Is the resistance between the drain D and the source S when the SR MOSFET Is turned on, Is the current magnitude when the SR MOSFET Is turned on, and SR Vds Is the voltage between the drain D and the source S when the SR MOSFET Is turned on. SR Vds is generally greater than-300 mV; when the SR gate is at a low level, the body diode of the MOSFET is conducted, and the SR Vds is generally less than-500 mV; it can be seen that the turn-on voltage drop of Vds also appears with a corresponding step. According to the working principle of the circuit, the voltage step correspondingly appears on the FB signal (the primary side control circuit can acquire the corresponding voltage step by acquiring the FB signal, and certainly, other modes can be adopted), and a digital signal complementary to the Pulse level is acquired by the digital signal extraction circuit. The high and low level setting mentioned in the present embodiment is only an example of the present invention, and is not a technical feature for limiting the present invention.
The invention also discloses an isolation power supply circuit which comprises the primary and secondary side communication control circuit.
In an embodiment of the present invention, the isolated power supply circuit further includes a transformer, a primary side switching tube located on the primary side, and a synchronous rectifier tube located on the secondary side; the transformer comprises a primary winding and a secondary winding. The primary side control circuit is coupled with the primary side switching tube, and the output end of the secondary side control circuit is coupled with the synchronous rectifying tube. In one embodiment, the synchronous rectifier is turned on when the driving pulse signal is at a high level; when the driving pulse signal is in a low level state, a body diode in the synchronous rectifying tube is conducted, and when the synchronous rectifying tube is conducted, a corresponding step appears on the voltage between the drain electrode and the source electrode; according to the working principle of the circuit, a voltage step is correspondingly arranged at a set position of a primary side; and the primary side control circuit extracts corresponding digital signals through the digital signal extraction circuit.
The invention also discloses an original secondary side communication control method, which comprises the following steps:
step S1, performing digital signal encoding processing on the setting information, and generating a modulation signal; when the original secondary side communicates, a driving pulse signal is generated by utilizing the modulation signal and a synchronous rectification control signal in a switching period of the isolation power supply circuit; the driving pulse signal is used for controlling the conduction state of the synchronous rectifier tube; and
step S2, extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal.
In an embodiment of the present invention, the step S1 specifically includes:
step S11, digital signal coding processing is carried out on the setting information;
step S12, generating a modulation signal according to the signal after the digital signal coding processing;
step S13, generating a driving pulse signal according to the synchronous rectification control signal and the modulation signal; and
in step S14, a secondary drive signal capable of controlling the conduction state of the synchronous rectifier is generated based on the drive pulse signal.
The specific steps can be referred to the above detailed description of the secondary side control circuit in the original secondary side communication control circuit, which is not described herein again.
In an embodiment of the present invention, the step S2 specifically includes:
step S21, extracting digital signals from the collected detection signals representing the setting information;
step S22, decoding the extracted digital signal;
step S23, acquiring the decoded digital signal, and acquiring corresponding information according to the decoded digital signal to generate a corresponding pulse signal; and
and step S24, outputting a primary side driving signal to control the conduction state of the primary side switching tube.
In one embodiment, the synchronous rectifier is turned on when the driving pulse signal is at a high level; when the driving pulse signal is in a low level state, a body diode in the synchronous rectifying tube is conducted, and when the synchronous rectifying tube is conducted, a corresponding step appears on the voltage between the drain electrode and the source electrode; according to the working principle of the circuit, a voltage step is correspondingly arranged at a set position of a primary side; and the primary side control circuit extracts corresponding digital signals through the digital signal extraction circuit.
The specific steps can be referred to the above detailed description of the primary side control circuit in the primary and secondary side communication control circuits, which is not described herein again.
In summary, the isolated power supply circuit, the primary and secondary side communication control circuit and the control method provided by the invention can save expensive optical couplers and other communication elements, and are suitable for various working modes such as DCM, CCM, CRM and the like; in addition, the invention can transmit various information and improve the diversity of information transmission.
Based on the existing power circuit without communication elements such as an optical coupler, the original secondary side communication mode of the invention can bear more information (a plurality of bits), while the prior art can only transmit whether the overvoltage is excessive (1 bit). In the prior art, the pulse width variation trend of a pulse signal is adopted to represent the height of output voltage, but the pulse width of the invention is not changed, and more information can be transmitted through chopping and digital coding.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (17)
1. An original secondary communication control circuit, characterized in that the original secondary communication control circuit comprises:
the secondary side control circuit is used for carrying out digital signal coding processing on the setting information and generating a modulation signal; when the primary side and the secondary side communicate, the secondary side control circuit generates a driving pulse signal by using the modulation signal and a synchronous rectification control signal in a switching period of the isolation power supply circuit, and the driving pulse signal is used for controlling the conduction state of the synchronous rectification tube; and
and the primary side control circuit is used for extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal.
2. The primary-secondary communication control circuit as claimed in claim 1, wherein:
the secondary side control circuit includes:
the digital signal coding circuit is used for carrying out digital signal coding processing on the setting information;
the input end of the modulation wave generating circuit is coupled with the output end of the digital signal coding circuit and is used for generating a modulation signal according to the signal processed by the digital signal coding circuit;
the synchronous rectification control circuit is used for outputting a synchronous rectification control signal; and
and the input end of the driving pulse generating circuit is respectively coupled with the output end of the synchronous rectification control circuit and the output end of the modulation wave generating circuit and used for generating a driving pulse signal according to the synchronous rectification control signal and the modulation signal.
3. The primary-secondary communication control circuit as claimed in claim 1, wherein:
the primary side control circuit includes:
the digital signal extraction circuit is used for extracting a digital signal from the acquired setting information;
the input end of the digital signal decoding circuit is coupled with the output end of the digital signal extracting circuit and is used for decoding the digital signal extracted by the digital signal extracting circuit; and
and the input end of the pulse control circuit is coupled with the output end of the digital signal decoding circuit and is used for acquiring the digital signal decoded by the digital signal decoding circuit and acquiring corresponding information according to the decoded digital signal to generate a pulse signal so as to control the conduction state of the primary side switching tube.
4. The primary-secondary communication control circuit as claimed in claim 1, wherein:
the primary side control circuit acquires signals of set positions of a primary side winding or/and an auxiliary winding; under the coupling action of the transformer, the primary side control circuit acquires a detection signal representing the setting information, and the detection signal can reflect and control the change of a driving pulse signal of the synchronous rectifier tube.
5. The primary-secondary communication control circuit as claimed in claim 2, wherein:
the secondary side control circuit further comprises an oscillator, the output end of the oscillator is coupled with the input end of the modulation wave generating circuit, the modulation wave generating circuit adjusts the period or/and the frequency of the modulation wave through the oscillator and generates a modulation signal according to the coding signal;
ensure Nbit Tchop < Tdem; wherein Nbit is the digit of the digital signal, Tchop is the modulation wave period, and Tdem is the pulse width of the synchronous rectification control signal.
6. The primary-secondary communication control circuit as claimed in claim 1, wherein:
the secondary side control circuit also comprises a micro control unit, and the micro control unit is used for carrying out digital signal coding processing on the setting information and generating a modulation signal according to the digital signal coding processing.
7. The primary-secondary communication control circuit as claimed in claim 2, wherein:
the secondary side control circuit further comprises a secondary side driving circuit, the input end of the secondary side driving circuit is coupled with the output end of the driving pulse generating circuit, and the output end of the secondary side driving circuit is coupled with the synchronous rectifying tube.
8. The primary-secondary communication control circuit as claimed in claim 2, wherein:
the input end of the digital signal coding circuit is coupled with the setting information, the setting information comprises at least one of a protection signal, control quantity acquisition information and system end configuration information, and the digital signal coding circuit carries out digital signal coding processing on the setting information.
9. The primary-secondary communication control circuit as claimed in claim 2, wherein:
the driving pulse generating circuit comprises an AND gate; the input end of the AND gate is respectively coupled with the output end of the synchronous rectification control circuit and the output end of the modulation wave generating circuit, and the output end of the AND gate outputs the driving pulse signal.
10. The primary-secondary communication control circuit of claim 3, wherein:
the primary side control circuit further comprises a primary side driving circuit, the input end of the primary side driving circuit is coupled with the output end of the pulse control circuit, and the output end of the primary side driving circuit is coupled with the primary side switching tube.
11. The primary-secondary communication control circuit of claim 3, wherein:
the digital signal extraction circuit includes a differentiation circuit for converting the rectangular pulse signal into a spike pulse signal, i.e., generating spike pulse signals at rising and falling edges of the rectangular pulse signal, thereby effectively identifying the corresponding signal.
12. The primary-secondary communication control circuit of claim 3, wherein:
the digital signal analyzed by the digital signal decoding circuit comprises at least one of the following information:
the protection information comprises at least one of overvoltage information, overcurrent information and overtemperature information;
parameter configuration information corresponding to configuration information of the load end system on the output voltage and/or the output current of the isolated power supply circuit; and
the control quantity acquisition information comprises at least one of output voltage of the isolation power supply circuit, analog quantity of output current and variation trend of the output voltage or the output current.
13. An isolated power supply circuit, characterized by: comprising the primary and secondary communication control circuit of any of claims 1 to 12.
14. The isolated power supply circuit of claim 13, wherein:
the isolation power supply circuit further comprises a transformer, a primary side switching tube positioned on a primary side and a synchronous rectifier tube positioned on a secondary side; the transformer comprises a primary winding and a secondary winding;
the primary side control circuit is coupled with the primary side switching tube, and the output end of the secondary side control circuit is coupled with the synchronous rectifying tube.
15. An original secondary side communication control method, characterized in that the original secondary side communication control method comprises:
step S1, carrying out digital signal coding processing on the setting information, and generating a modulation signal according to the digital signal coding processing; when the primary side and the secondary side communicate, a driving pulse signal for controlling the conducting state of the synchronous rectifier tube is generated by utilizing the modulation signal and a synchronous rectifier control signal in a switching period of the isolation power supply circuit; and
and step S2, extracting and decoding a digital signal from the acquired detection signal representing the setting information, and acquiring corresponding communication information according to the decoded digital signal.
16. The primary-secondary side communication control method according to claim 15, wherein:
the step S1 specifically includes:
step S11, digital signal coding processing is carried out on the setting information;
step S12, generating a modulation signal according to the signal after the digital signal coding processing;
step S13, generating a driving pulse signal according to the synchronous rectification control signal and the modulation signal; and
in step S14, a secondary drive signal capable of controlling the conduction state of the synchronous rectifier is generated based on the drive pulse signal.
17. The primary-secondary side communication control method according to claim 15, wherein:
the step S2 specifically includes:
step S21, extracting digital signals from the collected detection signals representing the setting information;
step S22, decoding the extracted digital signal;
step S23, acquiring the decoded digital signal, and acquiring corresponding information according to the decoded digital signal to generate a corresponding pulse signal; and
and step S24, outputting a primary side driving signal to control the conduction state of the primary side switching tube.
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| CN202010073779.5A CN113162441A (en) | 2020-01-22 | 2020-01-22 | Isolated power supply circuit, primary and secondary side communication control circuit and control method |
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Cited By (1)
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