CN111446865B - Slope compensation control circuit and slope compensation control method - Google Patents
Slope compensation control circuit and slope compensation control method Download PDFInfo
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- CN111446865B CN111446865B CN202010383084.7A CN202010383084A CN111446865B CN 111446865 B CN111446865 B CN 111446865B CN 202010383084 A CN202010383084 A CN 202010383084A CN 111446865 B CN111446865 B CN 111446865B
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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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- 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
Abstract
The application belongs to the technical field of DC/DC circuit control, and provides a slope compensation control circuit and a slope compensation control method, wherein the control circuit comprises: the control circuit comprises a loop compensation circuit, a sampling circuit and a control circuit, wherein the sampling circuit is used for acquiring electrical information in the DC/DC circuit, and the control circuit is connected with the sampling circuit and used for generating a loop output signal according to the electrical information; and the slope modulation circuit is connected with the loop compensation circuit and is used for receiving the loop output signal and adjusting the current comparison threshold value so as to realize slope compensation control. The method and the device solve the technical problems of excessive slope compensation amount and limited duty ratio existing in the conventional slope compensation control method, and improve the loading capacity and the transient response rate of the switching power supply.
Description
Technical Field
The application belongs to the technical field of DC/DC circuit control, and particularly relates to a slope compensation control circuit and a slope compensation control method.
Background
As new energy vehicles are gradually commercialized in the market, electric vehicles become the dominant force of new energy vehicles. The high-power vehicle-mounted DCDC is an important component in the electric automobile, and the requirement on the dynamic response capability of the DCDC is high due to the fact that the load on the vehicle has the characteristic of large dynamic jump. The peak current control has the characteristics of fast dynamic response, large gain bandwidth, small output inductance and the like, so the peak current control mode is very suitable for the vehicle DCDC. The slope compensation is a necessary module of the peak current control mode, when the duty ratio of the modulation pulse is more than 50%, a slope compensation signal needs to be superposed on a sampling signal of the peak current of the inductor, otherwise, the inductor can cause subharmonic oscillation.
A common method for slope compensation is linear compensation, i.e. starting from the beginning of the switching period, the compensation amount decreases linearly, which results in some times in excessive slope compensation amount and limited maximum duty cycle. The vehicle-mounted DCDC has the characteristic of wide input voltage range, and the load capacity and the transient response of a power supply are influenced after the maximum duty ratio is limited.
Disclosure of Invention
In order to solve the technical problems of excessive slope compensation amount and limited duty ratio existing in the slope compensation control method, the application provides a slope compensation control circuit and a slope compensation control method.
In a first aspect of the present application, there is provided a slope compensation control circuit, including a sampling circuit for acquiring electrical information in a DC/DC circuit, a control circuit connected to the sampling circuit, the control circuit including: the loop compensation circuit is connected with the sampling circuit and used for generating a loop output signal according to the electrical information; and the slope modulation circuit is connected with the loop compensation circuit and is used for receiving the loop output signal and adjusting the current comparison threshold value so as to realize slope compensation control.
In one embodiment, adjusting the current comparison threshold comprises adjusting a value of a synchronization point of the current comparison threshold and/or adjusting a value of a compensation slope k thereof according to the electrical information of the DC/DC circuit, and resetting the current comparison threshold to a value of a slope compensation starting point.
In one embodiment, the ramp modulation circuit includes: the slope generator is connected with the loop compensation circuit and used for generating the current comparison threshold value which is reduced by the compensation slope k according to the loop output signal; the comparator is respectively connected with the ramp generator and the primary side current collector in the sampling circuit and used for generating a trigger signal according to the current comparison threshold value and the input current of the primary side conversion circuit in the electrical information and sending the trigger signal to the ramp generator, and the ramp generator resets the current comparison threshold value; the PWM generator is connected with the comparator and used for carrying out wave generation configuration according to the trigger signal; and the ramp generator is connected to generate a synchronous signal and output the synchronous signal to the ramp generator, and the synchronous signal is used for synchronously updating the ramp compensation starting point of the current comparison threshold value so as to start the ramp compensation.
In one embodiment, the PWM generator includes: and the PWM counter is used for counting the time for generating the synchronous signal.
In one embodiment, the ramp modulation circuit further comprises: and the digital/analog converter is connected with the ramp generator and the comparator and is used for converting the current comparison threshold value output by the ramp generator into an analog signal and then transmitting the analog signal to the comparator.
In one embodiment, the loop compensation circuit includes: the voltage arithmetic unit is respectively connected with the secondary side voltage collector and the reference voltage source in the sampling circuit and is used for comparing the output voltage of the secondary side conversion circuit collected by the secondary side voltage collector with a pressure ring reference value to generate a voltage error signal; the voltage compensator is connected with the voltage arithmetic unit and is used for compensating the voltage error signal and generating a voltage loop signal; the current arithmetic unit is respectively connected with the secondary side current collector and the reference current source in the sampling circuit and is used for comparing the output current of the secondary side conversion circuit collected by the secondary side current collector with a current loop reference value to generate a current error signal; the current compensator is connected with the current arithmetic unit and is used for compensating the current error signal to generate a current loop signal; and the second comparator is respectively connected with the voltage compensator and the current compensator and is used for generating the loop output signal according to the voltage loop signal and the current loop signal.
In a second aspect of the present application, there is provided a slope compensation control method of the slope compensation control circuit, including: step S1: collecting electrical information in the DC/DC circuit; step S2: generating a loop output signal according to the electrical information; step S3: and generating a current comparison threshold according to the loop output signal, and adjusting the current comparison threshold according to the electrical information to realize slope compensation control.
In one embodiment, the step S3 includes: step S31: generating a current comparison threshold value for compensating the slope k drop according to the loop output signal; step S32: generating a trigger signal according to the current comparison threshold value and the input current of the primary side conversion circuit in the electrical information; step S33: and performing wave generation configuration based on the trigger signal, and generating a synchronous signal to synchronously update a slope compensation starting point of the current comparison threshold value so as to start slope compensation.
In an embodiment, the generating a trigger signal according to the current comparison threshold and the input current of the primary side conversion circuit in the electrical information in step S32 includes: and when the input current of the rising primary side conversion circuit is equal to the current comparison threshold value of the falling primary side conversion circuit, generating the trigger signal.
In an embodiment, the generating the synchronization signal of the step S33 includes: generating a first synchronization signal SYNC1 at a synchronization point a counted to a positive half period; and/or the synchronization point B counted to the negative half cycle generates the second synchronization signal SYNC 2.
Compared with the prior art, the invention has at least the following advantages:
collecting electrical information in the DC/DC circuit through a sampling circuit; then, inputting the collected electrical information into a loop compensation circuit in a control circuit connected with the sampling circuit, so that the loop compensation circuit generates a loop output signal according to the collected electrical information; and finally, inputting the generated loop output signal to a slope modulation circuit connected with the loop compensation circuit, so that the slope modulation circuit receives the loop output signal and adjusts a current comparison threshold value to realize slope compensation control, thereby effectively improving the loading capacity and the transient response rate of the switching power supply.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a slope compensation control circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a detailed structure of the slope compensation control circuit of FIG. 1;
FIG. 3 is a timing diagram of a wave generation method for slope compensation control according to an embodiment of the present disclosure;
fig. 4 is a timing chart of wave generation of a slope compensation control method according to another embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the present application.
The structure, method and related principles of the present application are described in detail below with reference to fig. 1-4 and the examples.
Referring to fig. 1-2, the present application provides a slope compensation control circuit, including a sampling circuit for collecting electrical information in a DC/DC circuit, and a control circuit connected to the sampling circuit, the control circuit including: the loop compensation circuit is connected with the sampling circuit and used for generating a loop output signal according to the electrical information; and the slope modulation circuit is connected with the loop compensation circuit and is used for receiving the loop output signal and adjusting the current comparison threshold value so as to realize slope compensation control.
The following describes the slope compensation control circuit in detail:
referring to fig. 1, the DC/DC circuit includes a transformer T1, a primary side converting circuit connected to two side windings of the transformer T1, and a secondary side converting circuit. Specifically, the primary side conversion circuit comprises a switching tube Q1, a switching tube Q2, a switching tube Q3 and a switching tube Q4. The source of the switching tube Q1 is connected to the drain of the switching tube Q3 to form a first arm, and the source of the switching tube Q2 is connected to the drain of the switching tube Q4 to form a second arm. The drain of the switching tube Q1 is connected to the positive pole of the input end of the primary side conversion circuit, the drain of the switching tube Q2 is connected to the positive pole of the input end of the primary side conversion circuit, and the source of the switching tube Q3 is connected to the negative pole of the input end of the primary side conversion circuit, the source of the switching tube Q4 is connected to the negative pole of the input end. The midpoints of the first leg and the second leg are connected to a first end of a primary side first winding W1 of a transformer T1 and a second end of a primary side second winding W2 of a transformer T1. The secondary side conversion circuit comprises a switching tube Q5, a switching tube Q6, an inductor L1 and a capacitor C1. The drain of the switching tube Q5 is connected to the first end of the secondary winding W2, and the source of the switching tube Q5 is connected to the negative electrode of the output Vo of the secondary converting circuit. The source of the switching tube Q6 is connected to the negative electrode of the output Vo, the drain of the switching tube Q6 is connected to the second end of the secondary side third winding W3, and the first end of the secondary side third winding W3 is connected to the second end of the secondary side second winding W2, connected to the inductor L1, and then connected to the positive electrode of the output Vo of the secondary side converting circuit. And a capacitor C1 is also connected between the positive electrode and the negative electrode of the output end Vo.
In another embodiment, the DC/DC circuit may be a half-bridge circuit or a full-bridge circuit, or may be a two-phase circuit, a three-phase circuit or a multi-phase circuit. In another embodiment, the two windings of the transformer T1 connected to the primary side conversion circuit and/or the secondary side conversion circuit may further be connected with a plurality of capacitors and/or inductors to form a filter circuit and/or a resonant circuit.
Referring to fig. 1 or 2, the sampling circuit includes a primary current collector, a primary voltage collector, a secondary current collector, and a secondary voltage collector. The primary side current collector is connected to the input end of the primary side conversion circuit and used for collecting the input current Ip of the primary side conversion circuit. The primary side voltage collector is connected to the input end of the primary side conversion circuit and used for collecting the input voltage Vin of the primary side conversion circuit. The secondary side current collector is connected to the output end of the secondary side conversion circuit and used for collecting the output current Io of the secondary side conversion circuit. And the secondary side voltage collector is connected to the output end of the secondary side conversion circuit and is used for collecting the output voltage Vo of the secondary side conversion circuit. The sampling circuit transmits the input current Ip, the input voltage Vin, the output current Io and the output voltage Vo to the control circuit.
Referring to fig. 2, the control circuit includes a loop compensation circuit and a ramp modulation circuit connected to the loop compensation circuit. The loop compensation circuit is connected to the secondary voltage collector and the secondary current collector to receive the output current Io and the output voltage Vo. The slope modulation circuit is connected to the primary side current collector and used for receiving the input current Ip.
The loop compensation circuit adopts a voltage and current loop parallel circuit. The loop Compensation circuit includes a voltage operator, a voltage compensator (2 p2z Compensation in FIG. 2), a current operator, a current compensator (2 p2z Compensation in FIG. 2), and a second comparator (MIN 2 in FIG. 2).
Specifically, the voltage calculator is respectively connected to the secondary side voltage collector (Sensing & Scaling in FIG. 2) and the reference voltage source (Vref Softstart in FIG. 2). The voltage arithmetic unit is used for comparing the output voltage Vo of the secondary conversion circuit collected by the secondary voltage collector with a pressure ring reference value Vref to generate a voltage error signal Verr. The voltage compensator is connected with the voltage arithmetic unit and is used for compensating the voltage error signal Verr and generating a voltage loop signal Vloop _ out. The current calculator is connected to the secondary current collector (Sensing & Scaling in fig. 2) and the reference current source (Iref Softstart in fig. 2), and compares the output current Io with the current loop reference value Iref to generate a current error signal Ierr. The current compensator is connected with the current arithmetic unit and is used for compensating the current error signal Ierr and generating a current loop signal Iloop _ out. The second comparator is connected to the voltage compensator and the current compensator respectively, and is configured to generate a loop output signal loop _ out according to the voltage loop signal Vloop _ out and the current loop signal Iloop _ out. In an embodiment, a signal with a smaller signal value is selected from the voltage loop signal Vloop _ out and the current loop signal Iloop _ out as the loop output signal loop _ out.
In other embodiments, the loop compensation circuit can also use a voltage outer loop nested current inner loop circuit or a current outer loop nested voltage outer loop circuit to replace the voltage and current loop parallel circuit in the above embodiments.
Referring to fig. 2, the Ramp modulation circuit includes a Ramp Generator (fig. 2: Ramp Generator), a digital-to-analog converter (fig. 2: DAC), a Comparator (fig. 2: Comparator) and a PWM Generator (fig. 3: PWM Module).
Specifically, the ramp generator is connected to the loop compensation circuit. And is used for generating a current comparison threshold Ip _ ref according to the loop output signal loop _ out. The digital/analog converter is connected with the ramp generator and is used for converting the current comparison threshold value Ip _ ref in the form of a digital signal output by the ramp generator into an analog signal. The comparator is respectively connected with the digital/analog converter and the primary side current collector, and is used for receiving the current comparison threshold value Ip _ ref and the input current Ip of the primary side conversion circuit, and comparing the current comparison threshold value Ip _ ref with the input current Ip of the primary side conversion circuit. When the current comparison threshold Ip _ ref is equal to the input current Ip, a trigger signal is generated. And sends the trigger signal to the ramp generator and the PWM generator. So that the ramp generator resets the current comparison threshold Ip _ ref to the starting point of the ramp compensation according to the trigger signal, and the value of the current comparison threshold Ip _ ref is the value of the loop output signal loop _ out. The PWM generator is respectively connected to the comparator, the ramp generator and the DRIVER (DRIVER in fig. 2), and is configured to generate the synchronization signals SYNC (including SYNC1 and SYNC 2) to be output to the ramp generator, and synchronously update the ramp compensation starting point of the current comparison threshold Ip _ ref, so that the current comparison threshold Ip _ ref is decreased from the ramp compensation starting point by the ramp compensation slope k, i.e., the ramp compensation control is started when the ramp compensation starting point is updated. The PWM generator receives the trigger signal output by the comparator, and controls the driver based on the trigger signal, and the driver drives the switching tube to act, so that wave generation configuration is carried out. The PWM generator comprises a PWM counter (PWM Countr in fig. 3) for counting the time of generation of the synchronization signal SYNC.
The application also provides a slope compensation control method. The slope compensation control method comprises the following steps: step S1: collecting electrical information in the DC/DC circuit; step S2: generating a loop output signal according to the electrical information; step S3: and generating a current comparison threshold according to the loop output signal, and adjusting the current comparison threshold according to the electrical information to realize slope compensation control.
It can be understood that, firstly, the electrical information in the DC/DC circuit is collected by the sampling circuit, and the electrical information includes the input current Ip and the input voltage Vin of the primary side conversion circuit, and the output current Io and the output voltage Vo of the secondary side conversion circuit. Then, the sampling circuit transmits the electrical information to the loop compensation circuit, and the loop compensation circuit receives and generates a loop output signal Vloop _ out according to the electrical information. And finally, the loop compensation circuit transmits the loop output signal Vloop _ out to the slope modulation circuit, the slope modulation circuit generates a current comparison threshold according to the loop output signal Vloop _ out, and the current comparison threshold is adjusted according to the electrical information to realize slope compensation control.
Specifically, step S3 includes: step S31: generating a current comparison threshold value for compensating the slope k drop according to the loop output signal; step S32: generating a trigger signal according to the current comparison threshold value and the input current of the primary side conversion circuit in the electrical information; step S33: based on the trigger signal, a wave-sending configuration is performed, and synchronization signals (including a first synchronization signal SYNC1 and a second synchronization signal SYNC 2) are generated to synchronously update the slope compensation starting point of the current comparison threshold value so as to start slope compensation.
More specifically, the step S32 of generating the trigger signal according to the current comparison threshold Ip _ ref and the input current Ip of the primary side conversion circuit in the electrical information includes: when the input current Ip of the rising primary side conversion circuit is equal to the falling current comparison threshold Ip _ ref, a trigger signal is generated.
More specifically, the generating of the synchronization signal of step S33 includes: generating a first synchronization signal SYNC1 at a synchronization point a counted to a positive half period; and/or the synchronization point B counted to the negative half cycle generates the second synchronization signal SYNC 2.
Details are provided below in conjunction with fig. 3-4.
Referring to fig. 3, Ts represents a switching cycle, including a positive half-cycle and a negative half-cycle. The PWM counter is used to count the time at which the synchronization signal SYNC is generated. The counting mode adopted by the PWM counter is as follows: 0- > PRD- > 0. Wherein PRD is a period value. The PWM SYNC1 represents the first synchronization signal SYNC1 issued when the PWM counter counts to the synchronization point a (in fig. 3: including a1, a2, A3, a 4) of the positive half cycle during the count-up process. PWM SYNC2 represents a second synchronization signal SYNC2 that the PWM counter counts during the count-down process to the synchronization point B (in fig. 3: comprising B1, B2, B3, B4) of the negative half cycle, where B = PRD-a.
In the positive half period of the switching period Ts, when the count of the PWM counter passes zero, the switching tubes Q1 and Q4 of the primary side conversion circuit are switched on, and the switching tube Q5 of the secondary side conversion circuit is switched off. The PWM counter continues to count up to a specific synchronization point a, generating a first synchronization signal SYNC 1. The ramp generator determines a starting point of the ramp compensation of the current comparison threshold Ip _ ref upon receiving the first synchronization signal SYNC1 generated by the PWM. The current comparison threshold Ip _ ref is the value of the loop output signal loop _ out. When the input current Ip of the primary side conversion circuit rises to be equal to the current comparison threshold Ip _ ref, the switching tubes Q1 and Q4 of the primary side conversion circuit are turned off, and the synchronous rectifier tube Q5 of the secondary side conversion circuit is turned on. By adjusting the value of the synchronization point A, the position of the intersection point of the current comparison threshold Ip _ ref of the positive half period and the input current Ip is changed, so that the current peak value of the output current Ip of the primary side conversion circuit is adjusted, the maximum duty ratio of a pulse signal of a switching tube in the primary side conversion circuit is changed and improved, and the adjustment of the output voltage Vo and/or the output current Io of the secondary side conversion circuit is realized.
In the negative half period of the switching period Ts, when the count value of the PWM counter reaches the period value PRD, the switching tubes Q2 and Q3 of the primary side conversion circuit are switched on, and the synchronous rectifier tube Q6 of the secondary side conversion circuit is switched off. The PWM counter continues to count down to synchronization point B, generating a second synchronization signal SYNC 2. The ramp generator determines the starting point of the ramp compensation of the current comparison threshold Ip _ ref upon receiving the second synchronization signal SYNC 2. The current comparison threshold Ip _ ref is the value of the loop output signal loop _ out. When the input current Ip of the primary side conversion circuit rises to be equal to the current comparison threshold Ip _ ref, the switching tubes Q2 and Q3 of the primary side conversion circuit are turned off, and the synchronous rectifying tube Q6 in the secondary side conversion circuit is turned on. By adjusting the value of the synchronization point B, the current peak value of the output current Ip of the primary side conversion circuit is adjusted, and the position of the intersection point of the current comparison threshold value Ip _ ref of the negative half period and the input current Ip is changed, so that the maximum duty ratio of pulse signals of a switching tube in the primary side conversion circuit is changed and improved, and the adjustment of the output voltage Vo and/or the output current Io of the secondary side conversion circuit is realized.
Under the condition that the value of the loop output signal loop _ out is constant, the position of the intersection point of the current comparison threshold Ip _ ref of the positive half period and/or the negative half period and the input current Ip is changed by adjusting the value of the synchronization point A and/or the synchronization point B, so that the current peak value of the output current Ip of the primary side conversion circuit in the positive half period and the negative half period can be respectively adjusted, and the duty ratio of the pulse signal of the primary side conversion circuit is adjusted and controlled. When the value a is larger and the value B is smaller, the current peak value of the input current Ip of the primary side conversion circuit is higher, and the duty ratio is larger. In order to ensure that the slope compensation is effective when the duty ratio is more than 50%, the value A should be between 0 and PRD/2, and the value B should be between PRD and PRD/2, namely the adjustable range of the point A is t0-t1 in FIG. 3, and the adjustable range of the point B is t2-t3 in FIG. 3. It should be noted that the value of the point a can be adjusted in real time according to the current conditions of the input current/input voltage of the primary side conversion circuit and the output current/output voltage of the secondary side conversion circuit.
In the embodiment of the application, the electrical information in the DC/DC circuit is collected through the sampling circuit; then, inputting the collected electrical information into a loop compensation circuit in a control circuit connected with the sampling circuit, so that the loop compensation circuit generates a loop output signal according to the collected electrical information; and finally, the generated loop output signal is input to a slope modulation circuit connected with the loop compensation circuit, so that the slope modulation circuit starts slope compensation control according to the loop output signal, and the maximum duty ratio of primary side driving is effectively improved and the load capacity and transient response of a power supply are improved through dynamic adjustment of a synchronization point.
Referring to FIG. 4, in another embodiment of the present application, the control logic of the switching transistors Q1-Q6 is similar to that of FIG. 3 in the previous embodiment. The difference lies in that the two points of the synchronization point A and the synchronization point B are kept constant, and the position of the intersection point of the current comparison threshold value Ip _ ref of the positive half period and/or the negative half period and the input current Ip is changed by adjusting the value of the slope compensation slope k of the current comparison threshold value Ip _ ref (comprising k1, k2 and k3 in figure 4, namely by adjusting to ensure that k1 is not equal to k2 not equal to k 3), so that the maximum duty ratio of a pulse signal for controlling a switching tube of the primary side conversion circuit is improved, and the loading capacity and the transient response of the power supply are improved. It should be noted that the slope k of the slope compensation can be adjusted in real time according to the current input current/voltage of the primary side conversion circuit and the current/voltage of the secondary side conversion circuit.
In other embodiments, the synchronization point (the first synchronization point a and/or the second synchronization point B) and the slope compensation slope may be dynamically adjusted at the same time to increase the maximum duty cycle of the primary side drive, and to increase the load capacity and transient response of the power supply.
It should be emphasized again that in the embodiments of the present application, the circuit structure is a full-bridge topology. Other similar topologies, such as half-bridge topology, are also covered by the present disclosure.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A slope compensation control circuit comprising a sampling circuit for collecting electrical information in a DC/DC circuit, a control circuit coupled to the sampling circuit, the control circuit comprising:
the loop compensation circuit is connected with the sampling circuit and used for generating a loop output signal according to the electrical information;
the slope modulation circuit is connected with the loop compensation circuit and used for receiving the loop output signal and adjusting a current comparison threshold value to realize slope compensation control;
the adjusting of the current comparison threshold comprises adjusting a value of a synchronization point of the current comparison threshold and/or adjusting a value of a compensation slope k thereof according to the electrical information of the DC/DC circuit, and resetting the current comparison threshold to a value of a slope compensation starting point;
the ramp modulation circuit includes:
the slope generator is connected with the loop compensation circuit and used for generating the current comparison threshold value which is reduced by the compensation slope k according to the loop output signal;
the comparator is respectively connected with the ramp generator and the primary side current collector in the sampling circuit and used for generating a trigger signal according to the current comparison threshold value and the input current of the primary side conversion circuit in the electrical information and sending the trigger signal to the ramp generator, and the ramp generator resets the current comparison threshold value;
the PWM generator is connected with the comparator and used for carrying out wave generation configuration according to the trigger signal; and the ramp generator is connected to generate a synchronous signal and output the synchronous signal to the ramp generator, and the synchronous signal is used for synchronously updating the ramp compensation starting point of the current comparison threshold value so as to start the ramp compensation.
2. The slope compensation control circuit of claim 1, wherein the PWM generator comprises: and the PWM counter is used for counting the time for generating the synchronous signal.
3. The slope compensation control circuit of claim 1, wherein the slope modulation circuit further comprises: and the digital/analog converter is connected with the ramp generator and the comparator and is used for converting the current comparison threshold value output by the ramp generator into an analog signal and then transmitting the analog signal to the comparator.
4. The slope compensation control circuit of claim 1, wherein the loop compensation circuit comprises:
the voltage arithmetic unit is respectively connected with the secondary side voltage collector and the reference voltage source in the sampling circuit and is used for comparing the output voltage of the secondary side conversion circuit collected by the secondary side voltage collector with a pressure ring reference value to generate a voltage error signal;
the voltage compensator is connected with the voltage arithmetic unit and is used for compensating the voltage error signal and generating a voltage loop signal;
the current arithmetic unit is respectively connected with the secondary side current collector and the reference current source in the sampling circuit and is used for comparing the output current of the secondary side conversion circuit collected by the secondary side current collector with a current loop reference value to generate a current error signal;
the current compensator is connected with the current arithmetic unit and is used for compensating the current error signal to generate a current loop signal;
and the second comparator is respectively connected with the voltage compensator and the current compensator and is used for generating the loop output signal according to the voltage loop signal and the current loop signal.
5. A slope compensation control method of the slope compensation control circuit according to claim 4, comprising:
step S1: collecting electrical information in the DC/DC circuit;
step S2: generating a loop output signal according to the electrical information;
step S3: and generating a current comparison threshold according to the loop output signal, and adjusting the current comparison threshold according to the electrical information to realize slope compensation control.
6. The slope compensation control method according to claim 5, wherein the step S3 includes:
step S31: generating a current comparison threshold value for compensating the slope k drop according to the loop output signal;
step S32: generating a trigger signal according to the current comparison threshold value and the input current of the primary side conversion circuit in the electrical information;
step S33: and performing wave generation configuration based on the trigger signal, and generating a synchronous signal to synchronously update a slope compensation starting point of the current comparison threshold value so as to start slope compensation.
7. The slope compensation control method of claim 6, wherein the generating a trigger signal according to the current comparison threshold and the input current of the primary side conversion circuit in the electrical information in step S32 comprises:
and when the input current of the rising primary side conversion circuit is equal to the current comparison threshold value of the falling primary side conversion circuit, generating the trigger signal.
8. The slope compensation control method according to claim 6, wherein the generating a synchronization signal of the step S33 includes: generating a first synchronization signal SYNC1 at a synchronization point a counted to a positive half period; and/or the synchronization point B counted to the negative half cycle generates the second synchronization signal SYNC 2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383084.7A CN111446865B (en) | 2020-05-08 | 2020-05-08 | Slope compensation control circuit and slope compensation control method |
| PCT/CN2020/101133 WO2021223322A1 (en) | 2020-05-08 | 2020-07-09 | Ramp compensation control circuit and ramp compensation control method |
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| CN202010383084.7A CN111446865B (en) | 2020-05-08 | 2020-05-08 | Slope compensation control circuit and slope compensation control method |
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| CN111446865A (en) | 2020-07-24 |
| WO2021223322A1 (en) | 2021-11-11 |
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