CN112260537A - Direct-current Boost power supply adopting double-tube Buck-Boost circuit - Google Patents
Direct-current Boost power supply adopting double-tube Buck-Boost circuit Download PDFInfo
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- CN112260537A CN112260537A CN202011097331.3A CN202011097331A CN112260537A CN 112260537 A CN112260537 A CN 112260537A CN 202011097331 A CN202011097331 A CN 202011097331A CN 112260537 A CN112260537 A CN 112260537A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Abstract
The invention provides a direct-current Boost power supply adopting a double-tube Buck-Boost circuit, wherein a main circuit comprises two power electronic switching devices Q1 and Q2, an inductor L1, a capacitor C1, two freewheeling diodes D1 and D2, the connection mode of the direct-current Boost power supply is the same as that of the devices in a standard double-tube Buck-Boost circuit, the input side of the direct-current Boost power supply is connected with an external power supply, the output side of the direct-current Boost power supply is connected with an external load, and a control circuit comprises an inductive current detection circuit, an output voltage detection circuit, a control current calculation circuit, a load identification circuit, a Q2 turn-off time calculation circuit, an energy calculation circuit, a Q2 driving circuit, a Q1 turn-off time calculation circuit, an output power detection circuit and a Q1 driving circuit. According to the direct-current Boost power supply, the control of power electronic switching devices in the double-tube Buck-Boost circuit is realized through the analysis and calculation of the energy of each part in the double-tube Buck-Boost circuit, the energy regulation rate in the main circuit is accelerated, and the dynamic performance of the power supply is further improved.
Description
Technical Field
The invention relates to a direct-current Boost power supply technology adopting a double-tube Buck-Boost circuit, in particular to a direct-current Boost power supply adopting the double-tube Buck-Boost circuit, which is a direct-current Boost power supply control circuit technology for realizing control of a power electronic switching device by taking an energy relation in a circuit as a criterion.
Background
The double-tube Buck-Boost circuit has the advantages of small voltage stress of a switching tube, same polarity of input voltage and output voltage, capability of realizing Buck-Boost control, high power density and the like, so that the double-tube Buck-Boost circuit is widely applied to a direct-current power supply. In a double-tube Buck-Boost circuit, PID control is one of the most widely applied control methods with high technical maturity. The principle of classical PID control is simple, the controller has the advantages of strong adaptability, simple design, low control cost and the like, but the integral link and the differential link are easy to generate saturation phenomenon, the differential link is sensitive to noise, the anti-interference capability is poor, the PID control dynamic response is slow, and the control effect is poor when the load is frequently changed.
Disclosure of Invention
The invention aims to provide a direct-current Boost power supply adopting a double-tube Buck-Boost circuit in order that the double-tube Buck-Boost circuit has good dynamic performance in various dynamic regulation processes, and the direct-current Boost power supply is a novel control circuit.
The purpose of the invention is realized as follows: the power supply comprises a main circuit, wherein the main circuit comprises two power electronic switching devices Q1 and Q2, an inductor L1, a capacitor C1, two freewheeling diodes D1 and D2, the connection mode of the power electronic switching devices is the same as that of a standard double-tube Buck-Boost circuit, the input side of the power electronic switching devices is used for being connected with an external power supply, the output side of the power electronic switching devices is used for being connected with an external load, and the power supply also comprises a control circuit, wherein the control circuit comprises an inductor current detection circuit, an output voltage detection circuit, a control current calculation circuit, a load identification circuit, a Q2 turn-off time calculation circuit, an energy calculation circuit, a Q2 driving circuit, a Q1 turn-off time calculation circuit, an output power detection circuit. The invention also includes such structural features:
1. the connection mode of the inductor current detection circuit and the inductor L1 is capable of ensuring that the inductor current detection circuit can detect the current of the inductor L1 in real time, and the signal output end of the inductor current detection circuit is respectively connected with the corresponding input ends of the Q2 turn-off time calculation circuit, the energy calculation circuit and the Q1 turn-off time calculation circuit; the output current detection circuit and the main circuit are connected in a way that the output current detection circuit can detect the output current of the main circuit, and the signal output end of the output current detection circuit is connected with the corresponding input end of the load identification circuit; the output voltage detection circuit is connected in parallel at two ends of a main circuit capacitor C1, and the signal output ends of the output voltage detection circuit are respectively connected with corresponding input ends of the load identification circuit, the Q2 turn-off time calculation circuit, the energy calculation circuit, the Q2 drive circuit, the Q1 turn-off time calculation circuit and the Q1 drive circuit; one input end of the control current calculating circuit is connected with the output end of the load identification circuit, and the other two input ends are respectively connected with an external given output voltage given value UrefThe output end of the switching frequency given value f is connected with the corresponding input ends of the Q2 turn-off time calculation circuit and the energy calculation circuit respectively; the output end of the load identification circuit is connected with the corresponding input end of the control current calculation circuit, and is also connected with the corresponding input ends of the energy calculation circuit and the output power detection circuit respectively; the output end of the Q2 turn-off time calculation circuit is respectively connected with the corresponding input ends of the energy calculation circuit and the Q2 driving circuit; the output end of the energy calculation circuit is connected with the corresponding input end of the Q2 driving circuit; the output end of the Q2 driving circuit is connected with the control end of a power electronic switching device Q2 in the main circuit; q1 off time calculation powerThe output end of the circuit is connected with the corresponding input end of the Q1 driving circuit; one input end of the output power detection circuit and an externally given output voltage given value UrefThe output end of the Q1 driving circuit is connected with the corresponding input end of the Q1 driving circuit; the output terminal of the Q1 driving circuit is connected to the control terminal of the power electronic switching device Q1 in the main circuit.
2. The power electronic switching devices Q1 and Q2, the inductor L1, the capacitor C1, the freewheeling diodes D1 and D2 are connected to form a double-tube Buck-Boost type power conversion circuit, and the direct-current voltage with constant input side amplitude is boosted to be the direct-current voltage required by the load on the output side.
3. The inductor current detection circuit detects the current i of the main circuit inductor L1LReal-time detection is carried out, and the detection result is transmitted to a Q2 turn-off time calculation circuit, an energy calculation circuit and a Q1 turn-off time calculation circuit; output current i of output current detection circuit to main circuitoCarrying out real-time detection and transmitting a detection result to a load identification circuit; output voltage u of output voltage detection circuit to main circuitoCarrying out real-time detection, and respectively transmitting detection results to a load identification circuit, a Q2 turn-off time calculation circuit, an energy calculation circuit, a Q2 driving circuit, a Q1 turn-off time calculation circuit and a Q1 driving circuit; the control current calculating circuit calculates a given value U according to the output voltagerefA given value f of the switching frequency, a load equivalent resistance value R, and a known DC voltage U at the input side of the main circuitinAnd the inductance L of the inductor L1 to calculate the control current iconAnd transmitting the calculation result to a Q2 turn-off time calculation circuit and an energy calculation circuit; the load identification circuit identifies the load equivalent resistance value R by using the existing identification algorithm according to the obtained output voltage signal and the output current signal, and transmits the identification result to the control current calculation circuit, the energy calculation circuit and the output power detection circuit.
4, Q2 turn-off time calculating circuit calculates the control current when u is calculated based on the inductor current detected by the inductor current detecting circuit, the output voltage detected by the output voltage detecting circuit and the control current calculated by the control current calculating circuito＞UinIn time, the requirement of the inductor current to be reduced to the control current is calculatedOff time t ofoffAnd the final result is transmitted to an energy calculation circuit and a Q2 driving circuit; the energy calculating circuit calculates the current u when the current u is based on the information transmitted from the inductor current detecting circuit, the output voltage detecting circuit, the control current calculating circuit, the load identifying circuit and the Q2 turn-off time calculating circuito＞UinAt this time, assume that the power electronic switching device Q2 is turned off at the present time and maintains toffDuration, calculating input energy W provided by external power supply during off-timeinOutput energy W of main circuitoutInductance energy variation amount Δ WLCapacitance energy variation amount Δ WCThe sum of the parts is used as an energy criterion W and is transmitted to a Q2 driving circuit.
The Q2 driving circuit completes the following logic judgment and output control according to the input signal: when the output voltage of the main circuit is less than or equal to the external power supply voltage at the input side of the main circuit, a driving signal with the frequency of a switching frequency given value f and the fixed duty ratio of 50% is output, and then the power electronic switching device Q2 is controlled to be switched on or switched off; when the output voltage of the main circuit is larger than the external power supply voltage, if the turn-off time calculated by the Q2 turn-off time calculation circuit is larger than zero, the Q2 driving circuit outputs low level at the moment that the energy criterion W calculated by the energy calculation circuit is larger than or equal to zero, and the t calculated at the moment is used for outputting low leveloffAt subsequent toffKeeping the output low for a period of time, and during this period the Q2 driver circuit stops logic until toffAnd judging and controlling the output again after the time delay is over, wherein the output of the Q2 driving circuit is in a high level under other conditions.
And 6, the Q1 turn-off time calculating circuit calculates the turn-off time of the power electronic switching device Q1 according to the information transmitted by the inductive current detection circuit and the output voltage detection circuit, and transmits the calculation result to the Q1 driving circuit.
7. The output power detection circuit calculates the power P required by the load in the current switching period at the initial moment of each switching period according to the information transmitted by the load identification circuit and the given value of the output voltagerefAnd with the last switching periodCalculation result Pref0, and determining the change of the power required by the load, and transmitting the result N to the Q1 driving circuit.
The Q1 driving circuit completes the following logic control according to the information transmitted by the output voltage detection circuit, the Q1 turn-off time calculation circuit and the output power detection circuit: when u iso≤UinWhen the voltage is high, the Q1 driving circuit outputs high level, and Q1 keeps conducting; when u iso＞UinWhen the power required by the load is increased or unchanged, the Q1 driving circuit outputs high level; when u iso＞UinAnd the power required by the load is reduced, the Q1 driving circuit outputs low level, and t is calculated according to tQ1At subsequent tQ1Keeping the output at low level for a time period until tQ1After the time delay is finished, the Q1 driving circuit carries out judgment and control again.
Compared with the prior art, the invention has the beneficial effects that: according to the direct-current Boost power supply, the control of power electronic switching devices in the double-tube Buck-Boost circuit is realized through the analysis and calculation of the energy of each part in the double-tube Buck-Boost circuit, the energy regulation rate in the main circuit is accelerated, and the dynamic performance of the power supply is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a main circuit and a control circuit of a dc boost power supply according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the dc boost power supply provided by the present invention specifically includes a main circuit and a control circuit.
The main circuit comprises two power electronic switching devices Q1 and Q2, an inductor L1, a capacitor C1 and two freewheeling diodes D1 and D2, the connection mode of the devices is completely the same as that of the devices in the existing standard double-tube Buck-Boost circuit, the input side of the device is used for being connected with an external power supply, and the output side of the device is used for being connected with an external load.
The control circuit comprises an inductive current detection circuit 1, an output current detection circuit 2, an output voltage detection circuit 3, a control current calculation circuit 4, a load identification circuit 5, a Q2 turn-off time calculation circuit 6, an energy calculation circuit 7, a Q2 drive circuit 8, a Q1 turn-off time calculation circuit 9, an output power detection circuit 10 and a Q1 drive circuit 11.
The connection relationship of the components of the control circuit is as follows: the connection mode of the inductor current detection circuit 1 and the inductor L1 should ensure that the inductor current detection circuit can detect the current of the inductor L1 in real time, and the signal output end of the inductor current detection circuit is respectively connected with the corresponding input ends of the Q2 turn-off time calculation circuit 6, the energy calculation circuit 7 and the Q1 turn-off time calculation circuit 9; the output current detection circuit 2 and the main circuit are connected in a way that the output current detection circuit can detect the output current of the main circuit, and the signal output end of the output current detection circuit is connected with the corresponding input end of the load identification circuit 5; the output voltage detection circuit 3 is connected in parallel at two ends of a main circuit capacitor C1 and is used for detecting output voltage, and the signal output ends of the output voltage detection circuit are respectively connected with corresponding input ends of the load identification circuit 5, the Q2 turn-off time calculation circuit 6, the energy calculation circuit 7, the Q2 drive circuit 8, the Q1 turn-off time calculation circuit 9 and the Q1 drive circuit 11; one input end of the control current calculating circuit 4 is connected with the output end of the load identification circuit 5, and the other two input ends are respectively connected with an externally given output voltage given value UrefThe output end of the switching frequency given value f is connected with the corresponding input ends of the Q2 turn-off time calculation circuit 6 and the energy calculation circuit 7 respectively; the output end of the load identification circuit 5 is connected with the corresponding input end of the control current calculation circuit 4, and is also connected with the corresponding input ends of the energy calculation circuit 7 and the output power detection circuit 10 respectively; the output end of the Q2 turn-off time calculation circuit 6 is respectively connected with the corresponding input ends of the energy calculation circuit 7 and the Q2 driving circuit 8; the output end of the energy calculation circuit 7 is connected with the corresponding input end of the Q2 driving circuit 8; the output end of the Q2 driving circuit 8 is connected with the control end of a power electronic switching device Q2 in the main circuit; the output end of the Q1 turn-off time calculation circuit 9 is connected with the corresponding input end of the Q1 driving circuit 11; an input terminal of the output power detection circuit 10 and an externally given output voltage given value UrefIs connected at its output end withThe corresponding input ends of the Q1 driving circuit 11 are connected; the output of the Q1 driver circuit 11 is connected to the control terminal of the power electronic switching device Q1 in the main circuit.
The functions of the respective components in the main circuit and the control circuit are as follows:
power electronic switching devices Q1 and Q2, an inductor L1, a capacitor C1, a freewheeling diode D1 and a freewheeling diode D2 are connected to form a double-tube Buck-Boost type power conversion circuit, and the amplitude of the input side is constant (U)in) The dc voltage is boosted to a dc voltage required by the output side load.
The inductor current detection circuit 1 functions to detect the current i of the main circuit inductor L1LReal-time detection is carried out, and the detection result is transmitted to a Q2 turn-off time calculation circuit 6, an energy calculation circuit 7 and a Q1 turn-off time calculation circuit 9.
The output current detection circuit 2 is used for detecting the output current i of the main circuitoReal-time detection is performed and the detection result is transmitted to the load identification circuit 5.
The output voltage detection circuit 3 is used for detecting the output voltage u of the main circuitoThe real-time detection is carried out, and the detection result is respectively transmitted to the load identification circuit 5, the Q2 turn-off time calculation circuit 6, the energy calculation circuit 7, the Q2 driving circuit 8, the Q1 turn-off time calculation circuit 9 and the Q1 driving circuit 11.
The control current calculating circuit 4 is used for calculating a given value U according to the output voltagerefA given value f of the switching frequency, a load equivalent resistance value R, and a known DC voltage U at the input side of the main circuitinAnd an inductance value L of an inductor L1, and calculating a control current i by using the formula (1)conIn the formula, Δ U is a known output voltage fluctuation amplitude allowed in steady-state operation, the control current is set to zero in a dynamic process, the control current is a lower limit reference value of an inductive current for ensuring that the main circuit has good dynamic performance, and a calculation result is transmitted to the Q2 turn-off time calculation circuit 6 and the energy calculation circuit 7.
The load identification circuit 5 is used for identifying a load equivalent resistance value R (which can be equal to a larger resistance value when the load is in no-load operation) by using the existing identification algorithm according to the obtained output voltage signal and output current signal, and transmitting the identification result to the control current calculation circuit 4, the energy calculation circuit 7 and the output power detection circuit 10.
The Q2 off time calculation circuit 6 functions to calculate u when u is based on the inductor current detected by the inductor current detection circuit 1, the output voltage detected by the output voltage detection circuit 3, and the control current calculated by the control current calculation circuit 4o＞UinThen, the turn-off time t required for the inductor current to decrease to the control current is calculated by using the formula (2)offAnd transmits the final result to the energy calculation circuit 7, Q2 drive circuit 8.
The energy calculating circuit 7 calculates the current u when u is based on the information transmitted from the inductive current detecting circuit 1, the output voltage detecting circuit 3, the control current calculating circuit 4, the load identifying circuit 5 and the Q2 turn-off time calculating circuit 6o＞UinAt this time, assume that the power electronic switching device Q2 is turned off at the present time and maintains toffDuration, calculating the input energy W provided by the external power supply during the off-time using equation (3)inOutput energy W of main circuitoutInductance energy variation amount Δ WLCapacitance energy variation amount Δ WC(the capacitance value C of the capacitor C1 is known), and the parts are added to be used as an energy criterion W and are transmitted to the Q2 driving circuit 8.
The Q2 driving circuit 8 performs the following logic judgment and output control according to the input signal: when the output voltage of the main circuit is less than or equal to the external power supply voltage (i.e. u) at the input side of the main circuito≤Uin) At the time of output frequency of the switchThe frequency given value f and the fixed duty ratio are 50% (the specific duty ratio can be set according to actual requirements), so that the power electronic switching device Q2 is controlled to be switched on (corresponding to the driving signal being at a high level) or switched off; when the output voltage of the main circuit is greater than the external power supply voltage (i.e., u)o>Uin) If the off-time calculated by the Q2 off-time calculation circuit 6 is greater than zero (i.e., t)off>0) Then, at the moment when the energy criterion W calculated by the energy calculation circuit 7 is greater than or equal to zero, the Q2 driving circuit 8 outputs a low level (i.e. turns off the power electronic switching device Q2), and based on t calculated at this momentoffAt subsequent toffThe output is kept at the low level for a certain period of time, and during this period the Q2 driving circuit 8 stops logic judgment until toffJudging and outputting control again after the time length is delayed to be over, and in other cases (for example, t)off>0 but the energy criterion is less than zero) the output of the Q2 driver circuit 8 is high.
The Q1 off time calculation circuit 9 calculates the off time of the power electronic switching device Q1 by using the formula (4) according to the information transmitted from the inductor current detection circuit 1 and the output voltage detection circuit 3, and transmits the calculation result to the Q1 driving circuit 11.
The output power detection circuit 10 calculates the power P required by the load in the current switching period by using the formula (5) at the initial moment of each switching period according to the information transmitted by the load identification circuit 5 and the given value of the output voltagerefAnd is compared with the calculation result P of the previous switching periodrefThe comparison of _0is made, the change of the power required by the load is judged by using the formula (6), and the result N is transmitted to the Q1 driving circuit 11.
N＝Pref-Pref_0 (6)
The Q1 driving circuit 11 completes the following logic control according to the information transmitted by the output voltage detection circuit 3, the Q1 turn-off time calculation circuit 9 and the output power detection circuit 10: when u iso≤UinAt this time, the Q1 driving circuit 11 outputs high level, and Q1 remains on; when u iso＞UinWhen the power required by the load is increased or unchanged (N is more than or equal to 0), the Q1 driving circuit 11 outputs a high level (Q1 is turned on at a high level); when u iso＞UinAnd the power required by the load decreases (N)<0) The Q1 drive circuit 11 outputs a low level, and t is calculated from t at this timeQ1At subsequent tQ1Keeping the output at low level for a time period until tQ1After the time delay is over, the Q1 driving circuit 11 performs judgment and control again.
The working principle of the invention is as follows:
in the process of the main circuit operation, the working principle of the dc boost power supply provided by the invention is as follows.
The input side of the main circuit is connected to an external power supply, and the output side is connected to a load. Inductor current detection circuit 1 detects current i of inductor L1 in main circuitLReal-time detection is carried out, and the detection result is transmitted to a Q2 turn-off time calculation circuit 6, an energy calculation circuit 7 and a Q1 turn-off time calculation circuit 9; output current i of output current detection circuit 2 to main circuitoCarrying out real-time detection and transmitting the detection result to the load identification circuit 5; output voltage u of output voltage detection circuit 3 to main circuitoReal-time detection is carried out, and detection results are respectively transmitted to the load identification circuit 5, the Q2 turn-off time calculation circuit 6, the energy calculation circuit 7, the Q2 drive circuit 8, the Q1 turn-off time calculation circuit 9 and the Q1 drive circuit 11; the control current calculation circuit 4 calculates a control current i by using the formula (1) based on the input signalconAnd transmits the calculation result to the Q2 turn-off time calculation circuit 6 and the energy calculation circuit 7; the load identification circuit 5 identifies the load equivalent resistance value R according to the obtained output voltage signal and output current signal, and transmits the identification result to the control current calculation circuit 4 and the energy calculation circuitA path 7, an output power detection circuit 10; the Q2 off time calculation circuit 6 calculates the control current u when u is based on the inductor current detected by the inductor current detection circuit 1, the output voltage detected by the output voltage detection circuit 3, and the control current calculated by the control current calculation circuit 4o＞UinThen, the turn-off time t required for the inductor current to decrease to the control current is calculated by using the formula (2)offAnd the final result is transmitted to the energy calculation circuit 7 and the Q2 driving circuit 8; the energy calculating circuit 7 calculates the current u when u is based on the information transmitted from the inductive current detecting circuit 1, the output voltage detecting circuit 3, the control current calculating circuit 4, the load identifying circuit 5 and the Q2 turn-off time calculating circuit 6o＞UinAt this time, assume that the power electronic switching device Q2 is turned off at the present time and maintains toffDuration, calculating the input energy W provided by the external power supply during the off-time using equation (3)inOutput energy W of main circuitoutInductance energy variation amount Δ WLCapacitance energy variation amount Δ WCThe sum of all parts is used as an energy criterion W and is transmitted to a Q2 driving circuit 8; the Q1 turn-off time calculation circuit 9 calculates the turn-off time of the power electronic switching device Q1 by using a formula (4) according to the information transmitted by the inductive current detection circuit 1 and the output voltage detection circuit 3, and transmits the calculation result to the Q1 driving circuit 11; the output power detection circuit 10 calculates the power P required by the load in the current switching period by using the formula (5) according to the information transmitted by the load identification circuit 5 and the given value of the output voltagerefAnd is compared with the calculation result P of the previous switching periodrefThe comparison of _0is made, the change of the power required by the load is judged by using the formula (6), and the result N is transmitted to the Q1 driving circuit 11.
The Q2 driving circuit 8 and the Q1 driving circuit 11 are used as driving circuits of two power electronic switching devices, and the working conditions of the two driving circuits are mainly divided into the following conditions:
(1) load demanded power increases and in boost condition (u)o＞Uin) When N is more than or equal to 0, the Q1 driving circuit 11 outputs high level, the Q1 keeps conducting, and the external power supply continuously provides energy for the circuit. The Q2 driving circuit 8 performs output control according to an energy criterion W, if W is less than 0, the electricity is indicatedWhen the energy in the circuit is insufficient, the Q2 driving circuit 8 outputs high level to charge the inductor L1; if W is more than or equal to 0, indicating that the internal energy of the circuit is sufficient or even excessive, turning off the Q2, and simultaneously, according to the turn-off time t calculated by the Q2 turn-off time calculation circuit 6off Q2 drive circuit 8 at toffThe internal output is kept unchanged at low level, so that the inductor L1 is rapidly discharged toffAfter the delay of the time length is finished, the Q2 driving circuit 8 performs logic judgment and output control again according to the input signal.
(2) Load demanded power is reduced and boost state (u)o＞Uin) When N is less than 0, the Q1 driving circuit 11 outputs low level, Q1 keeps off, and the energy input of the external power supply is cut off to prevent the energy of the circuit from being further excessive; the Q2 driving circuit 8 performs output control according to an energy criterion W, and if W is less than 0, the Q2 driving circuit 8 outputs high level; if W is more than or equal to 0, turning off Q2, and simultaneously, according to the turn-off time t calculated by the turn-off time calculation circuit 6 of Q2off Q2 drive circuit 8 at toffInternal output remains low, toffAfter the delay of the time length is finished, the Q2 driving circuit 8 performs logic judgment and output control again according to the input signal.
(3) When the output voltage is in a low-voltage state, i.e. uo≤Uin(e.g., initial stage of circuit start-up), in which case the Q1 driver circuit 11 outputs a high level, Q1 remains on, allowing the circuit to quickly absorb energy from the external power supply; the Q2 driving circuit 8 outputs a driving signal with a frequency of a given value f of the switching frequency and a fixed duty cycle of 50% (the specific duty cycle can also be set according to actual requirements), so as to control the power electronic switching device Q2 to be periodically turned on or off, and to promote the output voltage of the main circuit to be rapidly increased.
In summary, the boost power supply provided by the invention controls the power electronic switching device to be turned on or off by calculating and judging the energy state of the circuit, so that the energy regulation in the circuit is accelerated, the dynamic performance of the circuit is improved, and the steady-state operation can be realized.
Specific examples of the invention are given below:
the implementation method comprises the following steps:
the main circuit is a standard double-tube Buck-Boost type circuit, and the design and selection methods of devices such as power electronic switching devices Q1 and Q2, freewheeling diodes D1 and D2, a capacitor C1 and an inductor L1 are completely the same as those of the standard double-tube Buck-Boost circuit.
The inductor current detection circuit 1 and the output current detection circuit 2 are designed with reference to a circuit having current detection and information transfer functions, for example, in such a manner that a hall current sensor and a signal processing circuit are combined.
The output voltage detection circuit 3 is designed with reference to a circuit having a voltage detection function and an information transfer function, for example, in such a manner that a hall voltage sensor and a signal processing circuit are combined.
The control current calculating circuit 4 is implemented by a circuit capable of receiving external information and having data processing and communication functions, for example, a single chip microcomputer or a DSP with necessary peripheral circuits.
The load identification circuit 5 is implemented by a circuit capable of receiving voltage and current sampling signals and having data processing and communication functions, for example, a single chip microcomputer or a DSP with necessary peripheral circuits. The load equivalent resistance value can be identified by utilizing various existing load identification algorithms.
The Q2 turn-off time calculation circuit 6 is implemented by a circuit capable of receiving external information and having data processing and communication functions, for example, a single chip microcomputer or a DSP with necessary peripheral circuits.
The energy calculating circuit 7 is implemented by a circuit capable of receiving external information and having data processing and communication functions, for example, a single chip microcomputer or a DSP with necessary peripheral circuits.
The Q2 driving circuit 8 is implemented by a circuit capable of receiving external information and having data processing, communication, PWM signal generation and isolation driving functions, for example, a single chip or a DSP with necessary peripheral circuits.
The Q1 turn-off time calculation circuit 9 is implemented by a circuit capable of receiving external information and having data processing and communication functions, for example, a single chip microcomputer or a DSP with necessary peripheral circuits.
The output power detection circuit 10 is implemented by a circuit capable of receiving external information and having data processing and communication functions, for example, a single chip or a DSP with necessary peripheral circuits.
The Q1 driving circuit 11 is implemented by a circuit capable of receiving external information and having data processing, communication, PWM signal generation and isolation driving functions, for example, a single chip or a DSP with necessary peripheral circuits.
The implementation method II comprises the following steps:
for the case that the amplitude of the input side power supply voltage is not constant, an input voltage detection circuit can be added on the input side of the main circuit, and the input voltage detection circuit can be designed and realized by referring to various existing circuits with voltage detection and signal transmission functions, for example, a Hall type voltage sensor and a corresponding signal processing circuit can be used. The output of the input voltage detection circuit is respectively connected to the corresponding input ends of the control current calculation circuit 4, the Q2 turn-off time calculation circuit 6, the energy calculation circuit 7, the Q2 drive circuit 8 and other circuits, and the design and implementation method of other circuits are consistent.
Claims (9)
1. The utility model provides an adopt direct current Boost power supply of double-barrelled Buck-Boost circuit, includes the main circuit, and the main circuit includes two power electronic switch device Q1 and Q2, inductance L1, electric capacity C1, two freewheeling diode D1 and D2, and the connected mode is the same with the device connected mode in the standard double-barrelled Buck-Boost circuit, and the input side is used for being connected with external power supply, and the output side is used for being connected with external load, its characterized in that: the power supply circuit further comprises a control circuit, wherein the control circuit comprises an inductive current detection circuit, an output voltage detection circuit, a control current calculation circuit, a load identification circuit, a Q2 turn-off time calculation circuit, an energy calculation circuit, a Q2 driving circuit, a Q1 turn-off time calculation circuit, an output power detection circuit and a Q1 driving circuit.
2. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 1, characterized in thatIn the following steps: the connection mode of the inductor current detection circuit and the inductor L1 is capable of ensuring that the inductor current detection circuit can detect the current of the inductor L1 in real time, and the signal output end of the inductor current detection circuit is respectively connected with the corresponding input ends of the Q2 turn-off time calculation circuit, the energy calculation circuit and the Q1 turn-off time calculation circuit; the output current detection circuit and the main circuit are connected in a way that the output current detection circuit can detect the output current of the main circuit, and the signal output end of the output current detection circuit is connected with the corresponding input end of the load identification circuit; the output voltage detection circuit is connected in parallel at two ends of a main circuit capacitor C1, and the signal output ends of the output voltage detection circuit are respectively connected with corresponding input ends of the load identification circuit, the Q2 turn-off time calculation circuit, the energy calculation circuit, the Q2 drive circuit, the Q1 turn-off time calculation circuit and the Q1 drive circuit; one input end of the control current calculating circuit is connected with the output end of the load identification circuit, and the other two input ends are respectively connected with an external given output voltage given value UrefThe output end of the switching frequency given value f is connected with the corresponding input ends of the Q2 turn-off time calculation circuit and the energy calculation circuit respectively; the output end of the load identification circuit is connected with the corresponding input end of the control current calculation circuit, and is also connected with the corresponding input ends of the energy calculation circuit and the output power detection circuit respectively; the output end of the Q2 turn-off time calculation circuit is respectively connected with the corresponding input ends of the energy calculation circuit and the Q2 driving circuit; the output end of the energy calculation circuit is connected with the corresponding input end of the Q2 driving circuit; the output end of the Q2 driving circuit is connected with the control end of a power electronic switching device Q2 in the main circuit; the output end of the Q1 turn-off time calculation circuit is connected with the corresponding input end of the Q1 driving circuit; one input end of the output power detection circuit and an externally given output voltage given value UrefThe output end of the Q1 driving circuit is connected with the corresponding input end of the Q1 driving circuit; the output terminal of the Q1 driving circuit is connected to the control terminal of the power electronic switching device Q1 in the main circuit.
3. A dc Boost power supply using a double-tube Buck-Boost circuit according to claim 1 or 2, wherein: the power electronic switching devices Q1 and Q2, the inductor L1, the capacitor C1, the freewheeling diodes D1 and D2 are connected to form a double-tube Buck-Boost type power conversion circuit, and the direct-current voltage with constant input side amplitude is boosted to be the direct-current voltage required by the load on the output side.
4. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 3, wherein: the inductor current detection circuit detects the current i of the main circuit inductor L1LReal-time detection is carried out, and the detection result is transmitted to a Q2 turn-off time calculation circuit, an energy calculation circuit and a Q1 turn-off time calculation circuit; output current i of output current detection circuit to main circuitoCarrying out real-time detection and transmitting a detection result to a load identification circuit; output voltage u of output voltage detection circuit to main circuitoCarrying out real-time detection, and respectively transmitting detection results to a load identification circuit, a Q2 turn-off time calculation circuit, an energy calculation circuit, a Q2 driving circuit, a Q1 turn-off time calculation circuit and a Q1 driving circuit; the control current calculating circuit calculates a given value U according to the output voltagerefA given value f of the switching frequency, a load equivalent resistance value R, and a known DC voltage U at the input side of the main circuitinAnd the inductance L of the inductor L1 to calculate the control current iconAnd transmitting the calculation result to a Q2 turn-off time calculation circuit and an energy calculation circuit; the load identification circuit identifies the load equivalent resistance value R by using the existing identification algorithm according to the obtained output voltage signal and the output current signal, and transmits the identification result to the control current calculation circuit, the energy calculation circuit and the output power detection circuit.
5. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 4, wherein: the Q2 turn-off time calculating circuit calculates the control current when u is calculated based on the inductor current detected by the inductor current detecting circuit, the output voltage detected by the output voltage detecting circuit, and the control current calculated by the control current calculating circuito＞UinThen, the turn-off time t required for the inductor current to drop to the control current is calculatedoffAnd the final result is transmitted to an energy calculation circuit and a Q2 driving circuit; the energy calculation circuit detects the circuit and output voltage according to the inductive currentThe information transmitted by the detection circuit, the control current calculation circuit, the load identification circuit and the Q2 turn-off time calculation circuit is used as uo＞UinAt this time, assume that the power electronic switching device Q2 is turned off at the present time and maintains toffDuration, calculating input energy W provided by external power supply during off-timeinOutput energy W of main circuitoutInductance energy variation amount Δ WLCapacitance energy variation amount Δ WCThe sum of the parts is used as an energy criterion W and is transmitted to a Q2 driving circuit.
6. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 5, wherein: the Q2 driving circuit completes the following logic judgment and output control according to the input signal: when the output voltage of the main circuit is less than or equal to the external power supply voltage at the input side of the main circuit, a driving signal with the frequency of a switching frequency given value f and the fixed duty ratio of 50% is output, and then the power electronic switching device Q2 is controlled to be switched on or switched off; when the output voltage of the main circuit is larger than the external power supply voltage, if the turn-off time calculated by the Q2 turn-off time calculation circuit is larger than zero, the Q2 driving circuit outputs low level at the moment that the energy criterion W calculated by the energy calculation circuit is larger than or equal to zero, and the t calculated at the moment is used for outputting low leveloffAt subsequent toffKeeping the output low for a period of time, and during this period the Q2 driver circuit stops logic until toffAnd judging and controlling the output again after the time delay is over, wherein the output of the Q2 driving circuit is in a high level under other conditions.
7. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 6, wherein: the Q1 turn-off time calculation circuit calculates the turn-off time of the power electronic switching device Q1 according to the information transmitted by the inductive current detection circuit and the output voltage detection circuit, and transmits the calculation result to the Q1 driving circuit.
8. The method of claim 7The direct-current boosting power supply adopting the double-tube Buck-Boost circuit is characterized in that: the output power detection circuit calculates the power P required by the load in the current switching period at the initial moment of each switching period according to the information transmitted by the load identification circuit and the given value of the output voltagerefAnd is compared with the calculation result P of the previous switching periodref0, and determining the change of the power required by the load, and transmitting the result N to the Q1 driving circuit.
9. The direct-current Boost power supply adopting the double-tube Buck-Boost circuit as claimed in claim 8, wherein: the Q1 driving circuit completes the following logic control according to the information transmitted by the output voltage detection circuit, the Q1 turn-off time calculation circuit and the output power detection circuit: when u iso≤UinWhen the voltage is high, the Q1 driving circuit outputs high level, and Q1 keeps conducting; when u iso＞UinWhen the power required by the load is increased or unchanged, the Q1 driving circuit outputs high level; when u iso＞UinAnd the power required by the load is reduced, the Q1 driving circuit outputs low level, and t is calculated according to tQ1At subsequent tQ1Keeping the output at low level for a time period until tQ1After the time delay is finished, the Q1 driving circuit carries out judgment and control again.
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