CN112290794B - Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof - Google Patents
Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof Download PDFInfo
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- CN112290794B CN112290794B CN202011193823.2A CN202011193823A CN112290794B CN 112290794 B CN112290794 B CN 112290794B CN 202011193823 A CN202011193823 A CN 202011193823A CN 112290794 B CN112290794 B CN 112290794B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/36—Means for starting or stopping converters
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- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a power supply circuit with pre-constant current starting and quick recovery functions and a working method thereof, wherein the power supply circuit comprises a main power supply switch, a constant current circuit, a power-off quick reset circuit, an enabling circuit, a delay circuit and a BUCK-DCDC module circuit, wherein the output end of the main power supply switch is also connected with a capacitor C, and the other end of the capacitor C is grounded; the constant current circuit is connected with the main power switch in parallel; the input end of the power-off quick reset circuit is electrically connected with the input end of the main power switch, and the output end of the power-off quick reset circuit is electrically connected with the delay circuit; the enabling circuit is electrically connected with the main power switch and the BUCK-DCDC module circuit; the delay circuit is electrically connected with the enabling circuit and outputs a delay control signal to the enabling circuit; the BUCK-DCDC module circuit is connected with the rear-stage power utilization circuit and used for supplying power to the rear-stage power utilization circuit. The invention can realize linear increase of load starting voltage, eliminate the influence of starting surge current, and has strong capacitive load capacity, high power failure recovery speed and strong load capacity.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to a power supply circuit with functions of pre-constant current starting and quick recovery and a working method thereof.
Background
The coal industry is a very important basic industry in China, and a high-yield, efficient and safe modern mine technology is built, so that a high-reliability power supply technology cannot be used. In a special coal mine industry, the intrinsic safety explosion-proof technology is generated at the same time.
The intrinsic safety explosion-proof technology is one of the most widely used technologies in the world at present, is widely applied to the fields of mines, chemical engineering, metallurgy, petroleum and the like, is more and more important to ensure the safety of personnel and equipment, forms a series of industrial, national and international standards, and is deep along with the development of the technology. The most common forms of current mining equipment are intrinsically safe explosion-proof type, explosion-proof type and safety-increasing type. Due to the continuous improvement and progress of the electronic technology, the intrinsic safety explosion-proof technology has wider popularization and application; especially, the intrinsically safe (intrinsically safe for short) explosion-proof technology has been widely noticed by manufacturers and users as compared with other explosion-proof technologies, which not only has a very simple structure and a very wide application range, but also has the advantages of very simple operation and very convenient maintenance.
The intrinsic safety power supply is an intrinsic safety power supply, and the output highest voltage and the maximum current of the intrinsic safety power supply have intrinsic safety performance under normal working and fault states. Intrinsically safe performance means that any electrical spark or any thermal effect produced by an intrinsically safe power supply circuit under standard specified conditions (including normal operation and standard specified fault conditions) cannot ignite a specified explosive gas environment.
Because the circuit of the intrinsically safe electrical equipment is considered to be safe, and the discharge spark, the electric arc and the heat energy generated by the circuit can not ignite explosive mixtures in the surrounding environment of the circuit, the intrinsically safe circuit and the intrinsically safe electrical equipment have the advantages of high safety degree, small volume, light weight, simplicity in installation, convenience in maintenance, low manufacturing cost and the like in the use process, more importantly can be applied to flammable, explosive and other dangerous working environments, and the intrinsically safe circuit and the intrinsically safe electrical equipment become indispensable safety equipment at present.
At present, intrinsic safety equipment in a coal mine is powered by an intrinsic safety power supply, and the intrinsic safety equipment is mainly powered by a grading DC voltage reduction mode. At present, underground intrinsic safety equipment has the defects of large starting peak current, long secondary power-on recovery time after power failure, restart of an intrinsic safety power supply caused by synchronous starting of a plurality of loads and the like. Based on the characteristics of the intrinsic safety power supply, the overall loading capacity of the power supply is poor due to poor nonlinear loading capacity, meanwhile, in order to eliminate starting surge current, the power supply part of the intrinsic safety equipment is basically provided with a slow starting circuit, but the slow starting circuit mostly depends on the threshold voltage of an MOS (metal oxide semiconductor) tube to perform delayed starting at present, the threshold voltage range of the MOS tube is large, meanwhile, the temperature characteristics are poor, the slow starting is caused to have large difference, and the practical problem cannot be well solved.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problems to be solved by the invention are as follows: how to provide a can realize load starting voltage linear growth, eliminate the influence of starting surge current, have the capacitive load ability reinforce, the outage recovery rate is fast, the power supply circuit who has constant current start in advance and resume function fast that the load ability reinforce.
In addition, the invention also provides a working method of the power supply circuit with the functions of pre-constant current starting and quick recovery, so as to realize the purposes of linear increase of load starting voltage, elimination of the influence of starting surge current, strong capacitive load capacity, quick power failure recovery speed and strong load capacity.
In order to solve the technical problems, the invention adopts the following technical scheme:
the power supply circuit with the functions of pre-constant current starting and quick recovery comprises a main power supply switch, a constant current circuit, a power-off quick reset circuit, an enabling circuit, a delay circuit and a BUCK-DCDC module circuit, wherein the output end of the main power supply switch is also connected with a capacitor C, and the other end of the capacitor C is grounded;
the constant current circuit is connected with the main power switch in parallel, and charges the capacitor C when the main power switch is switched off, so that the voltage at two ends of the capacitor C is linearly increased;
the input end of the power-off quick reset circuit is electrically connected with the input end of the main power switch, the output end of the power-off quick reset circuit is electrically connected with the delay circuit, and the power-off quick reset circuit is used for quickly resetting the delay circuit when the power circuit is powered off;
the enabling circuit is respectively electrically connected with the main power switch and the BUCK-DCDC module circuit and is used for controlling the on and off of the main power switch and the BUCK-DCDC module circuit;
the delay circuit is electrically connected with the enabling circuit and outputs a delay control signal to the enabling circuit, so that the enabling circuit controls the starting time of the main power switch and the BUCK-DCDC module circuit through the delay control signal;
the BUCK-DCDC module circuit is connected with the rear-stage power utilization circuit and used for supplying power to the rear-stage power utilization circuit when the main power switch is closed.
The working principle of the invention is as follows: when the power circuit works, the power circuit is electrified, the constant current circuit is started and charges the capacitor C, so that the voltage at two ends of the capacitor C linearly rises, the enabling circuit controls the main power switch and the BUCK-DCDC module circuit to be switched off, and the power circuit does not supply power to the backward stage power circuit; when the capacitor C is full, the voltage at the two ends of the capacitor C reaches the set voltage, the delay circuit works, after the first delay time t1, the enabling circuit controls the main power switch to be turned on, and the constant current circuit is turned off while the main power switch is turned on; after the second delay time t2, the enabling circuit controls the BUCK-DCDC module circuit to be started, and at the moment, the power supply circuit supplies power to the backward-stage power utilization circuit; therefore, after the main power switch is turned on, the constant current circuit is bypassed, so that the constant current circuit does not work, surge current impact is effectively avoided, overcurrent or short-circuit protection of the intrinsic safety power supply caused by misoperation of the front-end circuit is avoided, and meanwhile, in the starting process of the power supply circuit, the starting voltage of the system is linearly increased, so that the intrinsic safety power supply has good load characteristics, and the loaded capacity of the intrinsic safety power supply is indirectly enhanced.
Meanwhile, after the power supply circuit is powered off, the power-off quick reset circuit works, so that the delay circuit is quickly reset. Therefore, the delay circuit can be quickly initialized, and the main power switch and the BUCK-DCDC module circuit can be started in a delayed manner when the system is powered on next time; therefore, the slow start effect is realized when the system is powered on next time, and the frequent hot plug function of the system is realized.
Therefore, the invention aims at solving the problems of large starting peak current of equipment and weak power supply carrying capacity, has multiple functions of power-on time delay, pre-constant current charging, quick power failure recovery and the like, can realize linear increase of load starting voltage, eliminates the influence of starting surge current, has strong capacitive load capacity, can realize quick power failure recovery, and can enhance the carrying capacity of the intrinsic safety power supply.
Preferably, the power-off fast reset circuit comprises a transistor Q1, a resistor R1 and a diode D1, an emitter of the transistor Q1 is used for being connected with the delay circuit, a collector of the transistor Q1 is grounded, a base of the transistor Q1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with an anode of the diode D1, and a cathode of the diode D1 is used for being connected with an input end of the main power switch.
Therefore, the power-off quick reset circuit can quickly initialize the delay circuit, so that the power circuit can be ensured to start the main power switch and the BUCK-DCDC module circuit in a delay manner when being powered on next time, a slow start effect is realized when the power circuit is powered on, and a frequent hot plug function of a system is realized.
Preferably, the enable circuit includes a hysteresis comparator, the hysteresis comparator provides a reference voltage by using a constant voltage source, the enable circuit has a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enable circuit is connected to the BUCK-DCDC module circuit, and the BUCK-DCDC module circuit is controlled to be turned on when the first output terminal OUTA is at a high level, the BUCK-DCDC module circuit is controlled to be turned off when the first output terminal OUTA is at a low level, the second output terminal OUTB of the enable circuit is connected to the main power switch, and the main power switch is controlled to be turned off when the second output terminal OUTB is at a high level, and the main power switch is controlled to be turned on when the second output terminal OUTB is at a low level.
Therefore, the power supply circuit can be started and shut down by controlling the levels of the first output end OUTA and the second output end OUTB of the enabling circuit, and the enabling circuit is matched with the delay circuit to realize the slow start of the power supply circuit together.
Preferably, the constant current circuit comprises an adjustable constant current source circuit and an output anti-reverse circuit, the output anti-reverse circuit comprises a diode D2, the anode of the diode D2 is connected with the output end of the adjustable constant current source circuit, and the cathode of the diode D2 is connected with the capacitor C.
Therefore, the constant current circuit comprises the adjustable constant current source circuit and the output anti-reverse circuit, the adjustable constant current source circuit can charge the capacitor C at a constant current according to needs, the voltage at two ends of the capacitor C rises linearly, and the output anti-reverse circuit can effectively prevent the reverse flow of current.
Preferably, the BUCK-DCDC module circuit comprises a BUCK circuit based on BUCK conversion, an output filter circuit and a feedback circuit; the delay circuit includes an adjustable integration circuit.
Thus, the BUCK-DCDC module circuit is used for outputting a given voltage level and supplying power to the backward stage power utilization circuit; the voltage reduction circuit in the BUCK-DCDC module circuit can adopt a discrete device or an integrated circuit; the adjustable integration circuit contained in the delay circuit can accurately control the starting time of the main power switch and the BUCK-DCDC module circuit.
Preferably, the second output terminal OUTB of the enable circuit is connected to the main power switch through a zener diode D3, the anode of the zener diode D3 is connected to the second output terminal OUTB of the enable circuit, and the cathode of the zener diode D3 is connected to the main power switch.
In this way, by providing the zener diode D3, the signal of the second output terminal OUTB is ensured to be output to the main power switch in a unidirectional and stable manner, and the control effect of the output signal of the second output terminal OUTB on the main power switch is ensured.
A working method of a power circuit with pre-constant current starting and fast recovery functions adopts the power circuit with the pre-constant current starting and fast recovery functions, and comprises the following steps:
step 1) a power supply circuit is powered on, the constant current circuit is started and charges the capacitor C, so that the voltage at two ends of the capacitor C rises linearly, the enabling circuit controls the main power switch and the BUCK-DCDC module circuit to be switched off, and the power supply circuit does not supply power to a backward stage power circuit;
step 2) when the capacitor C is full, the voltage at two ends of the capacitor C reaches a set voltage, the delay circuit works, and after a first delay time t1, the enabling circuit controls the main power switch to be turned on, and the constant current circuit is turned off while the main power switch is turned on; after a second delay time t2, the enabling circuit controls the BUCK-DCDC module circuit to be started, and at the moment, the power supply circuit supplies power to the backward-stage power utilization circuit;
and 3) after the power supply circuit is powered off, the power-off quick reset circuit works to quickly reset the delay circuit.
Therefore, after the power supply circuit is powered on, the constant current circuit is firstly utilized to charge the capacitor C, so that the starting voltage of the system is linearly increased, the load characteristic is good, and the loaded capacity is enhanced; meanwhile, after the main power switch is turned on, the bypass constant-current circuit enables the constant-current circuit not to work, so that the impact of surge current can be effectively avoided; in addition, after the power supply circuit is powered off, the delay circuit can be quickly reset under the action of the power-off quick reset circuit, so that the purpose of starting the main power switch and the BUCK-DCDC module circuit in a delayed mode can be achieved when the system is powered on every time, the slow start effect is achieved, and the system can also work normally and stably under frequent hot plug operation.
Preferably, the enable circuit includes a hysteresis comparator, the hysteresis comparator provides a reference voltage by using a constant voltage source, the enable circuit has a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enable circuit is connected to the BUCK-DCDC module circuit, and controls the BUCK-DCDC module to be turned on when the first output terminal OUTA is at a high level, controls the BUCK-DCDC module to be turned off when the first output terminal OUTA is at a low level, and controls the main power switch to be turned off when the second output terminal OUTB is at a high level, and controls the main power switch to be turned on when the second output terminal OUTB is at a low level;
in the step 1), in the process that the constant current circuit charges the capacitor C, the first output terminal OUTA of the enable circuit outputs a low level to turn off the BUCK-DCDC module circuit, and the second output terminal OUTB of the enable circuit outputs a high level to turn off the main power switch.
Preferably, in step 2), when the voltage across the capacitor C reaches the set voltage, the delay circuit operates, after a first delay time t1, the second output terminal OUTB of the enable circuit outputs a low level to turn on the main power switch, and at the same time, the first output terminal OUTA changes from the low level to a high-impedance state, and after a second delay time t2, the BUCK-DCDC module circuit is turned on, and the power supply circuit supplies power to the backward stage power utilization circuit normally.
Therefore, after the voltage at the two ends of the capacitor C reaches a set value and is delayed for a certain time, the main power switch and the BUCK-DCDC module circuit are sequentially started, and the constant current circuit is disconnected, so that the BUCK-DCDC module circuit is ensured to be started after the capacitor C is fully charged, and the influence of surge current is eliminated.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention thoroughly eliminates the surge impact of system electrification, linearly increases the starting voltage of the system, has good load characteristics and indirectly enhances the multi-load capacity of the intrinsic safety power supply.
2. The invention supports system hot plug, even if the system is hot plugged frequently, the system still can embody superior surge current impact resistance, the restart of the same power supply equipment can not be caused, and the system recovery time is less than 500 ms.
3. The invention has good consistency and is basically not influenced by devices and high and low temperature differences.
Drawings
FIG. 1 is a schematic block diagram of a power supply circuit with pre-constant current start and fast recovery functions according to the present invention;
FIG. 2 is a schematic circuit diagram of a power supply circuit with pre-constant current start and fast recovery functions according to the present invention;
FIG. 3 is a waveform diagram of the power circuit with pre-constant current start and fast recovery function according to the present invention;
FIG. 4 is a waveform comparison diagram (with 1.5A load) of the power circuit with pre-constant current start and fast recovery functions of the present invention and the power circuit of the prior art when the intrinsic safety power supply is used for supplying power;
fig. 5 is a waveform comparison diagram (with 1.5A load) of the power circuit with pre-constant current start and fast recovery functions of the invention and the power circuit of the prior art when a direct current stabilized power supply is used for supplying power.
Description of reference numerals: the circuit comprises a main power switch 1, a constant current circuit 2, a delay circuit 3, a power-off quick reset circuit 4, an enable circuit 5 and a BUCK-DCDC module circuit 6.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 1, the power circuit with pre-constant current starting and fast recovery function comprises a main power switch 1, a constant current circuit 2, a power-off fast reset circuit 4, an enable circuit 5, a delay circuit 3 and a BUCK-DCDC module circuit 6, wherein the output end of the main power switch 1 is also connected with a capacitor C, and the other end of the capacitor C is grounded;
the constant current circuit 2 is connected with the main power switch 1 in parallel, and the constant current circuit 2 charges the capacitor C when the main power switch 1 is switched off, so that the voltage at two ends of the capacitor C is linearly increased;
the input end of the power-off quick reset circuit 4 is electrically connected with the input end of the main power switch 1, the output end of the power-off quick reset circuit 4 is electrically connected with the delay circuit 3, and the power-off quick reset circuit 4 is used for quickly resetting the delay circuit 3 when the power circuit is powered off;
the enabling circuit 5 is respectively electrically connected with the main power switch 1 and the BUCK-DCDC module circuit 6 and is used for controlling the on and off of the main power switch 1 and the BUCK-DCDC module circuit 6;
the delay circuit 3 is electrically connected with the enable circuit 5, and the delay circuit 3 outputs a delay control signal to the enable circuit 5, so that the enable circuit 5 controls the starting time of the main power switch 1 and the BUCK-DCDC module circuit 6 through the delay control signal;
the BUCK-DCDC module circuit 6 is connected to the rear stage power utilization circuit, and is configured to supply power to the rear stage power utilization circuit when the main power switch 1 is closed.
The working principle of the invention is as follows: when the power circuit works, the power circuit is electrified, the constant current circuit 2 is started and charges the capacitor C, so that the voltage at two ends of the capacitor C linearly rises, the enabling circuit 5 controls the main power switch 1 and the BUCK-DCDC module circuit 6 to be switched off, and the power circuit does not supply power to the backward-stage power circuit; when the capacitor C is full, the voltage at the two ends of the capacitor C reaches the set voltage, the delay circuit 3 works, and after the first delay time t1, the enabling circuit 5 controls the main power switch 1 to be turned on, and the constant current circuit 2 is turned off while the main power switch 1 is turned on; after the second delay time t2, the enabling circuit 5 controls the BUCK-DCDC module circuit 6 to be started, and at the moment, the power supply circuit supplies power to the backward stage power utilization circuit; therefore, after the main power switch 1 is turned on in the scheme, the constant current circuit 2 is bypassed, so that the constant current circuit 2 does not work, surge current impact is effectively avoided, overcurrent or short-circuit protection of the intrinsic safety power supply caused by misoperation of the front-end circuit is avoided, and meanwhile, in the starting process of the power supply circuit, the starting voltage of the system is linearly increased, so that the power supply circuit has good load characteristics, and the load carrying capacity of the intrinsic safety power supply is indirectly enhanced.
Meanwhile, when the power supply circuit is powered off, the power-off quick reset circuit 4 works, so that the delay circuit 3 is quickly reset. Therefore, the delay circuit 3 can be initialized quickly, and the main power switch 1 and the BUCK-DCDC module circuit 6 can be started in a delayed manner when the system is powered on next time; therefore, the slow start effect is realized when the system is powered on next time, and the frequent hot plug function of the system is realized.
Therefore, the invention aims at solving the problems of large starting peak current of equipment and weak power supply carrying capacity, has multiple functions of power-on time delay, pre-constant current charging, quick power failure recovery and the like, can realize linear increase of load starting voltage, eliminates the influence of starting surge current, has strong capacitive load capacity, can realize quick power failure recovery, and can enhance the carrying capacity of the intrinsic safety power supply.
As shown in fig. 2, in the present embodiment, the power-off fast reset circuit 4 includes a transistor Q1, a resistor R1, and a diode D1, wherein an emitter of the transistor Q1 is used for being connected to the delay circuit 3, a collector of the transistor Q1 is grounded, a base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to an anode of the diode D1, and a cathode of the diode D1 is used for being connected to an input terminal of the main power switch 1.
Therefore, the power-off quick reset circuit 4 can quickly initialize the delay circuit 3, so that the power circuit can be ensured to start the main power switch 1 and the BUCK-DCDC module circuit 6 in a delayed manner when being powered on next time, a slow start effect is realized when the power circuit is powered on, and a frequent hot plug function of the system is realized.
In this embodiment, the enabling circuit 5 includes a hysteresis comparator, the hysteresis comparator uses a constant voltage source to provide a reference voltage, the enabling circuit 5 has a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enabling circuit 5 is connected to the BUCK-DCDC module circuit 6, and the BUCK-DCDC module circuit 6 is controlled to be turned on when the first output terminal OUTA is at a high level, the BUCK-DCDC module circuit 6 is controlled to be turned off when the first output terminal OUTA is at a low level, the second output terminal OUTB of the enabling circuit 5 is connected to the main power switch 1, and the main power switch 1 is controlled to be turned off when the second output terminal OUTB is at a high level, and the main power switch 1 is controlled to be turned on when the second output terminal OUTB is at a low level.
Therefore, the power supply circuit can be started and shut down by controlling the levels of the first output end OUTA and the second output end OUTB of the enabling circuit 5, and the enabling circuit 5 is matched with the delay circuit 3 to realize the slow start of the power supply circuit together.
In this embodiment, the constant current circuit 2 includes an adjustable constant current source circuit and an output anti-reverse circuit, the output anti-reverse circuit includes a diode D2, an anode of the diode D2 is connected to the output terminal of the adjustable constant current source circuit, and a cathode of the diode D2 is connected to the capacitor C.
Therefore, the constant current circuit 2 comprises an adjustable constant current source circuit and an output anti-reverse circuit, the adjustable constant current source circuit can charge the capacitor C with constant current according to needs, the voltage at two ends of the capacitor C rises linearly, and the output anti-reverse circuit can effectively prevent the reverse flow of current.
In the present embodiment, the BUCK-DCDC module circuit 6 includes a BUCK circuit based on BUCK conversion, an output filter circuit, and a feedback circuit; the delay circuit 3 comprises an adjustable integrating circuit.
Thus, the BUCK-DCDC module circuit 6 is used to output a given voltage level to supply power to the subsequent power consuming circuit; the voltage reduction circuit in the BUCK-DCDC module circuit 6 can adopt a discrete device or an integrated circuit; the adjustable integration circuit contained in the delay circuit 3 can accurately control the starting time of the main power switch 1 and the BUCK-DCDC module circuit 6.
In the present embodiment, the second output terminal OUTB of the enable circuit 5 is connected to the main power switch 1 through the zener diode D3, the anode of the zener diode D3 is connected to the second output terminal OUTB of the enable circuit 5, and the cathode of the zener diode D3 is connected to the main power switch 1.
In this way, by providing the zener diode D3, the signal of the second output terminal OUTB is ensured to be output to the main power switch 1 in a unidirectional and stable manner, and the control effect of the output signal of the second output terminal OUTB on the main power switch 1 is ensured.
A working method of a power circuit with pre-constant current starting and fast recovery functions adopts the power circuit with the pre-constant current starting and fast recovery functions, and comprises the following steps:
step 1) a power supply circuit is electrified, a constant current circuit 2 is started and charges a capacitor C, so that the voltage at two ends of the capacitor C rises linearly, an enabling circuit 5 controls a main power switch 1 and a BUCK-DCDC module circuit 6 to be switched off, and the power supply circuit does not supply power to a backward stage power circuit;
step 2) when the capacitor C is full, the voltage at the two ends of the capacitor C reaches the set voltage, the delay circuit 3 works, and after the first delay time t1, the enabling circuit 5 controls the main power switch 1 to be turned on, and the constant current circuit 2 is turned off while the main power switch 1 is turned on; after the second delay time t2, the enabling circuit 5 controls the BUCK-DCDC module circuit 6 to be started, and at the moment, the power supply circuit supplies power to the backward stage power utilization circuit;
and step 3) when the power supply circuit is powered off, the power-off quick reset circuit 4 works to quickly reset the delay circuit 3.
Therefore, after the power supply circuit is powered on, the constant current circuit 2 is firstly utilized to charge the capacitor C, so that the starting voltage of the system is linearly increased, the load characteristic is good, and the capacity with the load is enhanced; meanwhile, after the main power switch 1 is turned on, the bypass constant current circuit 2 enables the constant current circuit 2 not to work, so that the impact of surge current can be effectively avoided; in addition, after the power supply circuit is powered off, the delay circuit 3 can be quickly reset under the action of the power-off quick reset circuit 4, so that the purpose of starting the main power switch 1 and the BUCK-DCDC module circuit 6 in a delayed manner can be achieved when the system is powered on every time, the slow starting effect is realized, and the system can also work normally and stably under frequent hot plug operation.
In this embodiment, the enabling circuit 5 includes a hysteresis comparator, the hysteresis comparator provides a reference voltage by using a constant voltage source, the enabling circuit 5 has a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enabling circuit 5 is connected to the BUCK-DCDC module circuit 6, and the BUCK-DCDC module is controlled to be turned on when the first output terminal OUTA is at a high level, the BUCK-DCDC module is controlled to be turned off when the first output terminal OUTA is at a low level, the second output terminal OUTB of the enabling circuit 5 is connected to the main power switch 1, and the main power switch 1 is controlled to be turned off when the second output terminal OUTB is at a high level, and the main power switch 1 is controlled to be turned on when the second output terminal OUTB is at a low level;
in the step 1), in the process that the constant current circuit 2 charges the capacitor C, the first output terminal OUTA of the enable circuit 5 outputs a low level to turn off the BUCK-DCDC module circuit 6, and the second output terminal OUTB of the enable circuit 5 outputs a high level to turn off the main power switch 1.
In this embodiment, in step 2), when the voltage across the capacitor C reaches the set voltage, the delay circuit 3 operates, after the first delay time t1 elapses, the second output terminal OUTB of the enable circuit 5 outputs a low level to turn on the main power switch 1, and at the same time, the first output terminal OUTA changes from the low level to a high-impedance state, and after the second delay time t2 elapses, the BUCK-DCDC module circuit 6 is turned on, and the power supply circuit supplies power to the backward stage circuit normally.
Therefore, after the voltage at the two ends of the capacitor C reaches a set value and is delayed for a certain time, the main power switch 1 and the BUCK-DCDC module circuit 6 are sequentially started, the constant current circuit 2 is disconnected, the BUCK-DCDC module circuit 6 is ensured to be started after the capacitor C is fully charged, and the influence of surge current is eliminated.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention thoroughly eliminates the surge impact of system electrification, linearly increases the starting voltage of the system, has good load characteristics and indirectly enhances the multi-load capacity of the intrinsic safety power supply.
2. The invention supports system hot plug, even if the system is hot plugged frequently, the system still can embody superior surge current impact resistance, the restart of the same power supply equipment can not be caused, and the system recovery time is less than 500 ms.
3. The invention has good consistency and is basically not influenced by devices and high and low temperature differences.
The starting timing mechanism of the present invention is further described with reference to fig. 3, wherein 1 is an input voltage waveform, 2 is an internal starting voltage waveform of the power circuit, and 3 is an output voltage waveform of the BUCK-DCDC module circuit 6.
When the power circuit is powered on at the time t0, the constant current circuit 2 works, the voltage across the capacitor C increases linearly, when the voltage across the capacitor C reaches a set voltage (the set voltage is close to the input voltage, in the embodiment, the set voltage is the input voltage minus the tube voltage drop of the diode), the main power switch 1 is turned on when the voltage increases slowly to the time t1, and at the time, the bypass constant current circuit 2 enables the constant current circuit 2 to be turned off; and enabling the BUCK-DCDC module circuit 6 and starting to work when t3 is reached after a period of time, enabling the whole system to enter a stable working state, and showing good linear starting characteristics without surge current in the whole starting process.
Fig. 4 is a waveform comparison of the starting process of the power circuit (left) adopting the invention and the power circuit (right) adopting the prior art when the intrinsic safety power supply supplies power, and fig. 5 is a waveform comparison of the starting process of the power circuit (left) adopting the invention and the power circuit (right) adopting the prior art when the direct current stabilized power supply supplies power. Wherein 1 is input voltage waveform, 2 is power supply circuit internal start voltage waveform, 3 is BUCK-DCDC module circuit 6 output voltage waveform, through comparing the analysis with two kinds of different mains supplies power supply, the power supply scheme circuit of prior art either can't start normally, or can appear the jump of electric current in the course of starting, and the capacitance value of the capacitive load is bigger, the electric current jump is more obvious; the power circuit corresponding to the invention can keep good linear starting characteristic, thereby changing phase and increasing the carrying capacity of the power supply.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (8)
1. The power supply circuit with the functions of pre-constant current starting and quick recovery is characterized by comprising a main power supply switch, a constant current circuit, a power-off quick reset circuit, an enabling circuit, a delay circuit and a BUCK-DCDC module circuit, wherein the output end of the main power supply switch is also connected with a capacitor C, and the other end of the capacitor C is grounded;
the constant current circuit is connected with the main power switch in parallel, and charges the capacitor C when the main power switch is switched off, so that the voltage at two ends of the capacitor C is linearly increased;
the input end of the power-off quick reset circuit is electrically connected with the input end of the main power switch, the output end of the power-off quick reset circuit is electrically connected with the delay circuit, and the power-off quick reset circuit is used for quickly resetting the delay circuit when the power circuit is powered off;
the enabling circuit is respectively electrically connected with the main power switch and the BUCK-DCDC module circuit and is used for controlling the on and off of the main power switch and the BUCK-DCDC module circuit;
the delay circuit is electrically connected with the enabling circuit and outputs a delay control signal to the enabling circuit, so that the enabling circuit controls the starting time of the main power switch and the BUCK-DCDC module circuit through the delay control signal;
the BUCK-DCDC module circuit is connected with a rear-stage power utilization circuit and used for supplying power to the rear-stage power utilization circuit when the main power switch is closed;
the quick power-off reset circuit comprises a triode Q1, a resistor R1 and a diode D1, an emitter of the triode Q1 is used for being connected with the delay circuit, a collector of the triode Q1 is grounded, a base of the triode Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with an anode of the diode D1, and a cathode of the diode D1 is used for being connected with an input end of the main power switch.
2. The power supply circuit with pre-constant current start and fast recovery function as claimed in claim 1, wherein the enable circuit comprises a hysteretic comparator, the hysteretic comparator uses a constant voltage source to provide a reference voltage, the enabling circuit is provided with a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enabling circuit is connected with the BUCK-DCDC module circuit, and controls the BUCK-DCDC module circuit to be turned on when the first output terminal OUTA is at a high level, when the first output end OUTA is in low level, the BUCK-DCDC module circuit is controlled to be turned off, the second output end OUTB of the enabling circuit is connected with the main power switch, and controlling the main power switch to be turned off when the second output terminal OUTB is at a high level, and controlling the main power switch to be turned on when the second output terminal OUTB is at a low level.
3. The power supply circuit with pre-constant current start and fast recovery functions as claimed in claim 1, wherein the constant current circuit comprises an adjustable constant current source circuit and an output anti-reverse circuit, the output anti-reverse circuit comprises a diode D2, the anode of the diode D2 is connected with the output end of the adjustable constant current source circuit, and the cathode of the diode D2 is connected with the capacitor C.
4. The power supply circuit with the pre-constant current starting and fast recovery function according to claim 1, wherein the BUCK-DCDC module circuit comprises a BUCK circuit based on BUCK conversion, an output filter circuit and a feedback circuit; the delay circuit includes an adjustable integration circuit.
5. The power supply circuit with pre-constant current start-up and fast recovery functions as claimed in claim 2, wherein the second output terminal OUTB of the enable circuit is connected to the main power switch through a zener diode D3, the anode of the zener diode D3 is connected to the second output terminal OUTB of the enable circuit, and the cathode of the zener diode D3 is connected to the main power switch.
6. A method for operating a power supply circuit with pre-constant current start-up and fast recovery functions, wherein the power supply circuit with pre-constant current start-up and fast recovery functions as claimed in claim 1 is adopted, and the method comprises the following steps:
step 1) a power supply circuit is powered on, the constant current circuit is started and charges the capacitor C, so that the voltage at two ends of the capacitor C rises linearly, the enabling circuit controls the main power switch and the BUCK-DCDC module circuit to be switched off, and the power supply circuit does not supply power to a backward stage power circuit;
step 2) when the capacitor C is full, the voltage at two ends of the capacitor C reaches a set voltage, the delay circuit works, and after a first delay time t1, the enabling circuit controls the main power switch to be turned on, and the constant current circuit is turned off while the main power switch is turned on; after a second delay time t2, the enabling circuit controls the BUCK-DCDC module circuit to be started, and at the moment, the power supply circuit supplies power to the backward-stage power utilization circuit;
and 3) after the power supply circuit is powered off, the power-off quick reset circuit works to quickly reset the delay circuit.
7. The operating method of the power circuit with pre-constant current start and fast recovery function as claimed in claim 6, wherein the enable circuit comprises a hysteretic comparator, the hysteretic comparator uses a constant voltage source to provide a reference voltage, the enabling circuit is provided with a first output terminal OUTA and a second output terminal OUTB, the first output terminal OUTA of the enabling circuit is connected with the BUCK-DCDC module circuit, and controls the BUCK-DCDC module circuit to be turned on when the first output terminal OUTA is at a high level, when the first output end OUTA is in low level, the BUCK-DCDC module circuit is controlled to be turned off, the second output end OUTB of the enabling circuit is connected with the main power switch, when the second output end OUTB is at a high level, the main power switch is controlled to be turned off, and when the second output end OUTB is at a low level, the main power switch is controlled to be turned on;
in the step 1), in the process that the constant current circuit charges the capacitor C, the first output terminal OUTA of the enable circuit outputs a low level to turn off the BUCK-DCDC module circuit, and the second output terminal OUTB of the enable circuit outputs a high level to turn off the main power switch.
8. The method as claimed in claim 7, wherein in step 2), when the voltage across the capacitor C reaches the set voltage, the delay circuit operates, after a first delay time t1, the second output terminal OUTB of the enable circuit outputs a low level to turn on the main power switch, and the first output terminal OUTA changes from the low level to a high-impedance state, and after a second delay time t2, the BUCK-DCDC module circuit turns on, and the power supply circuit supplies power to the backward stage power utilization circuit normally.
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| CN202011193823.2A CN112290794B (en) | 2020-10-30 | 2020-10-30 | Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof |
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| CN202011193823.2A CN112290794B (en) | 2020-10-30 | 2020-10-30 | Power supply circuit with pre-constant current starting and fast recovery functions and working method thereof |
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| CN112290794B true CN112290794B (en) | 2021-10-26 |
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| CN116131238B (en) * | 2023-04-14 | 2023-08-08 | 深圳市迅特通信技术股份有限公司 | Circuit for inhibiting hot plug surge current and pluggable module |
| CN117713524A (en) * | 2024-02-05 | 2024-03-15 | 成都新欣神风电子科技有限公司 | High-voltage positive line impact current suppression circuit |
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| RU2263925C2 (en) * | 2000-11-08 | 2005-11-10 | Дженерал Электрик Компани | Method and device for detecting short-circuit ground and calculating its resistance |
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| CN101882879A (en) * | 2010-06-30 | 2010-11-10 | 海洋王照明科技股份有限公司 | Circuit converting constant current source to constant voltage source and light using same |
| CN202364112U (en) * | 2011-11-20 | 2012-08-01 | 合肥华耀电子工业有限公司 | Starting circuit of control chip of switching-mode power supply |
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