CN110806778B - Time base phase control direct current voltage stabilizing power supply - Google Patents
Time base phase control direct current voltage stabilizing power supply Download PDFInfo
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- CN110806778B CN110806778B CN201911213979.XA CN201911213979A CN110806778B CN 110806778 B CN110806778 B CN 110806778B CN 201911213979 A CN201911213979 A CN 201911213979A CN 110806778 B CN110806778 B CN 110806778B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a time-base phase-control direct-current stabilized voltage supply which mainly comprises a trigger, a phase-control silicon controlled rectifier, a trigger synchronous switch, a time delay capacitor, a trigger control circuit, a phase-control synchronous signal source and a trigger circuit power supply. The trigger adopts a 555 time-base integrated circuit chip with excellent performance and low price, and is specifically connected with a phase-controlled silicon controlled rectifier, a trigger synchronous switch, a time delay capacitor, a trigger control circuit and a phase-controlled synchronous signal source to form a unique time-base phase-controlled trigger circuit. Compared with the existing phase-control direct-current stabilized voltage power supply, the phase-control direct-current stabilized voltage power supply has a relatively simple structure because complex discrete component circuits and a singlechip control system are avoided. Its anti-interference ability is strong, and its working stability and reliability are further raised. Because simple structure, core component 555 chip low price, the cost of controlling trigger circuit mutually descends by a wide margin.
Description
Technical Field
The invention belongs to the field of a phase-controlled direct-current voltage-stabilized power supply in an electronic technology, and particularly relates to a time-base phase-controlled direct-current voltage-stabilized power supply.
Background
The phase control trigger circuit of the existing phase control direct current stabilized voltage power supply is divided into two types, namely a discrete type and an integrated type.
The discrete type phase control circuit has the disadvantages of poor reliability and stability, complex phase control circuit, high adjustment difficulty and high power consumption.
Modular integration, while better in performance, is expensive and relies heavily on imports.
The existing phase-control direct current stabilized voltage supply can not meet the requirements of excellent performance and low price.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the time base phase-controlled direct-current voltage-stabilized power supply solves the problems that the phase-controlled direct-current voltage-stabilized power supply in the prior art is poor in reliability and stability and high in cost.
The invention adopts the following technical scheme for solving the technical problems:
a time-base phase-control direct-current stabilized voltage supply comprises a trigger, a phase-control silicon controlled rectifier, a trigger synchronous switch, a delay capacitor, a trigger control circuit, a phase-control synchronous signal source and a trigger circuit power supply, wherein the trigger is a 555 time-base integrated circuit chip and is used for generating a trigger pulse signal for controlling the conduction of the phase-control silicon controlled rectifier;
the phase control silicon controlled rectifier plays a role of a contactless switch;
the trigger synchronous switch comprises an input tube and an output tube and is used for synchronizing the full-wave rectification voltage and the trigger pulse signal;
the trigger control circuit comprises a trigger control tube and a voltage stabilizing diode; the trigger delay angle and the conduction angle are controlled by controlling the charging time of the delay capacitor so as to realize the control of the output voltage of the delay capacitor;
the phase control synchronous signal source provides synchronous signals for the synchronous switch;
the trigger circuit power supply provides stable working voltage for the trigger circuit.
The phase-control silicon controlled rectifiers comprise two phase-control silicon controlled rectifiers, cathodes of the two phase-control silicon controlled rectifiers are connected with the ground end of a 555 time-base integrated circuit chip and the anode of a phase-control direct-current power supply, the threshold end and the trigger end of the 555 time-base integrated circuit chip are divided into three paths after being connected, the first path is connected with the positive power source end of the 555 time-base integrated circuit chip through a delay capacitor, the second path is connected with the collector electrode of a trigger synchronous switch output tube, the emitting electrode of the trigger synchronous switch output tube is connected with the positive power source end of the 555 time-base integrated circuit chip, the third path is connected with the collector electrode of a trigger control tube through a crystal diode, and the emitting electrode of.
The output end of the 555 time-base integrated circuit chip is divided into two paths through a capacitor, and the two paths are respectively connected with the control electrode of the phase-control silicon controlled rectifier through a resistor to form a resistance-capacitance coupling trigger output loop.
The input tube of the trigger synchronous switch is connected with the full-bridge rectification output end of the trigger circuit power supply through a resistor.
The base of the input end of the trigger control tube is divided into two paths through a second resistor, one path is connected with the negative electrode of the phase-controlled direct-current power supply through a voltage stabilizing diode and a third resistor, and the other path is connected with the positive electrode of the trigger circuit power supply through a fourth resistor, so that the trigger control circuit with the functions of reference voltage sampling, phase-controlled direct-current voltage sampling, comparing and amplifying is formed.
Compared with the prior art, the invention has the following beneficial effects:
1. the structure is relatively simple because complex discrete component circuits and singlechip control systems are avoided.
2. Because the logic conversion of the 555 chip only depends on the input ends 1/3Ue and 2/3Ue, and is unrelated to the variation fluctuation of the power supply voltage, the anti-interference capability is strong, and the working stability and the reliability are further improved.
3. Because the reference voltage circuit in the 555 chip is composed of 3 high-precision resistors, the voltage division precision is high, the parameter consistency is good, and the phase control circuit is produced without any debugging.
4. Because the ground end of the 555 chip is directly connected with the cathode of the phase-controlled silicon controlled rectifier, the output end of the 555 chip is in resistance-capacitance coupling with the control electrode of the phase-controlled silicon controlled rectifier, and one 555 chip can directly push the hundred-ampere-level silicon controlled rectifier. And because the 555 chip is fast, the trigger rising edge is less than 1 microsecond, the average value of the trigger current is very small, usually less than 1 milliampere, and the trigger power consumption is very low.
5. Because simple structure, core component 555 chip low price, the cost of controlling trigger circuit mutually descends by a wide margin.
6. In the three-phase control circuit, the trigger delay angle and the conduction angle of the controlled silicon can be kept consistent without a special conduction angle balancing circuit.
Drawings
FIG. 1 is a circuit schematic diagram of a time-base phase-controlled DC voltage-stabilized power supply of the present invention.
FIG. 2 is a waveform diagram of the operation of the time-base phase-controlled DC voltage-stabilized power supply of the present invention.
Detailed Description
The structure and operation of the present invention will be further described with reference to the accompanying drawings.
A time-base phase-control direct-current voltage-stabilized power supply comprises a trigger, a phase-control silicon controlled rectifier, a trigger synchronous switch, a delay capacitor, a trigger control circuit, a phase-control synchronous signal source and a trigger circuit power supply, wherein the trigger is a 555 time-base integrated circuit chip (herein, referred to as 555 chip for short) and is used for generating a trigger pulse signal for controlling the conduction of the phase-control silicon controlled rectifier; the phase control silicon controlled rectifier plays a role of a contactless switch; the trigger synchronous switch comprises an input tube and an output tube and is used for synchronizing the full-wave rectification voltage and the trigger pulse signal; the charging time of the delay capacitor determines the size of the trigger delay angle; the trigger control circuit comprises a trigger control tube and a voltage stabilizing diode; the trigger delay angle and the conduction angle are controlled by controlling the charging time of the delay capacitor so as to realize the control of the output voltage of the delay capacitor; the phase control synchronous signal source provides synchronous signals for the synchronous switch; the trigger circuit power supply provides stable working voltage for the trigger circuit.
In the above constitution, the trigger synchronous switch and the trigger circuit power supply are the same as those of the prior art. The difference is that: the trigger adopts a 555 time-base integrated circuit chip with excellent performance and low price, and is specifically connected with a phase-controlled silicon controlled rectifier, a trigger synchronous switch, a time delay capacitor, a trigger control circuit and a phase-controlled synchronous signal source to form a unique time-base phase-controlled trigger circuit.
The cathodes of the two phase-controlled thyristors are connected with the ground end of the 555 time-base integrated circuit chip and the anode of the phase-controlled direct-current power supply, so that the cathodes of the two phase-controlled thyristors and the reference point ground of the 555 chip have the same potential; the threshold end and the trigger end of the 555 time-base integrated circuit chip are connected and then divided into three paths, the first path is connected with the positive power source end of the 555 time-base integrated circuit chip through a delay capacitor, the second path is connected with the collector of the trigger synchronous switch output tube, the emitter of the trigger synchronous switch output tube is connected with the positive power source end of the 555 time-base integrated circuit chip, and the third path is connected with the collector of the trigger control tube through a crystal diode to form a synchronous charging and discharging delay trigger input loop; and the emitter of the trigger control tube is connected with the ground end of the 555 time-base integrated circuit chip through a first resistor.
The output end of the 555 time-base integrated circuit chip is divided into two paths through a capacitor, and the two paths are respectively connected with the control electrode of the phase-control silicon controlled rectifier through a resistor to form a resistance-capacitance coupling trigger output loop.
The input tube of the trigger synchronous switch is connected with the full-bridge rectification output end of the trigger circuit power supply through a resistor, and a synchronous signal is directly obtained from the trigger circuit power supply, so that a trigger synchronous signal transformer is omitted.
The base of the input end of the trigger control tube is divided into two paths through a second resistor, one path is connected with the negative electrode of the phase-controlled direct-current power supply through a voltage stabilizing diode and a third resistor, and the other path is connected with the positive electrode of the trigger circuit power supply through a fourth resistor, so that the trigger control circuit with the functions of reference voltage sampling, phase-controlled direct-current voltage sampling, comparing and amplifying is formed.
The specific embodiment is as shown in fig. 1 and fig. 2:
the trigger is composed of a 555 time-base chip IC 1; the phase-controlled silicon controlled rectifier consists of an SCR1 and an SCR 2; the trigger synchronous switch is mainly composed of transistors Q1, Q5 and Q6, wherein Q1 is an input tube of the trigger synchronous switch, and Q6 is an output tube of the trigger synchronous switch; the delay capacitor is formed by C3; the trigger control circuit mainly comprises a transistor Q7 and a voltage stabilizing diode ZD 1; the phase control synchronous signal source is composed of an alternating current power transformer T1 and crystal diodes D1, D2, D3 and D4; the trigger circuit power source Ue is mainly constituted by the IC 2.
The ground end 1 of the 555 chip IC1 is connected with the cathodes of the phase-controlled thyristors SCR1 and SCR2 and the anode Uo + of the phase-controlled direct-current power supply, so that the cathodes of the phase-controlled thyristors and the reference point ground of the 555 chip IC1 have the same potential; the output end 3 of the 555 chip IC1 is respectively connected with the control electrodes of the phase-controlled silicon controlled rectifiers SCR1 and SCR2 through a capacitor C8 and resistors R5 and R6 to form a resistance-capacitance coupling trigger output loop; after a threshold end 6 of the 555 chip IC1 is connected with a trigger end 2, a first path is connected with a positive power source end 8 of the 555 chip IC1 through a delay capacitor C3, a second path is connected with a collector of a transistor Q6, an emitter of the transistor Q6 is connected with the positive power source end 8 of the 555 chip IC1, a third path is connected with a collector of the transistor Q7 through a transistor D10, and the emitter of the transistor Q7 is connected with a ground end 1 of the 555 chip through a resistor R7 to form a synchronous charging-discharging delay trigger input loop.
The base of the transistor Q1 at the input end of the synchronous switch is connected with the full-bridge rectification output end of the trigger circuit power supply and the cathodes of the crystal diodes D3 and D4 through the resistor R1, so that the phase control synchronous signal is directly obtained, and a phase control synchronous signal transformer is omitted.
The base of the transistor Q7 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with the negative electrode Uo-of the phase-control direct-current power supply through a voltage stabilizing diode ZD1 and a resistor R12, and the other end is connected with the positive electrode Ue + of the trigger circuit power supply through a resistor R11, so that the trigger control circuit with the functions of reference voltage sampling, phase-control power supply voltage comparing and amplifying is formed.
The working waveform of the circuit is shown in fig. 2, Ut is the base voltage of a synchronous switching tube Q1, Uc is the input voltage of the input ends 6 and 2 of the 555 chip, Uz is the output voltage of the output end 3 of the 555 chip, Iz is the output current of the output end 3 of the 555 chip, Ik is the conduction current of the phase-controlled silicon controlled rectifier, and Uo is the phase-controlled direct current voltage.
In order to further explain the circuit composition and the working principle of the scheme, the selection basis and the main parameters of key components are listed, the group of parameters can achieve a better effect but are not the only selection, and a person skilled in the art can make corresponding changes according to the circuit and the specific application, in the specification and the attached drawing 1, a time delay capacitor C3 can be selected to be 0.68uF, the stability of a temperature coefficient is required to be good, and the time constant tau of the capacitor C5 and a resistor R9 is usually about 0.1S. If the output dc voltage Uo is too small, the output dc voltage Uo may be adjusted too fast to generate jitter, and if the output dc voltage Uo is too large, the output dc voltage Uo may be adjusted too slowly to generate large fluctuation range when the load or the ac power voltage is changed.
The silicon controlled rectifiers SCR1 and SCR2 belong to power devices, and should meet the requirements of forward current and forward and reverse voltage resistance, and all other devices do not meet the power requirements due to extremely low power consumption.
Except for the transistor Q7, all transistors work in a switch state, and the values of the resistor and the capacitor only need to ensure that the transistors can be switched on and off to realize a clear logic state.
The working process is as follows:
when the base voltage Ut of the synchronous switch tube Q1 is lower than 0.7V, the switch tubes Q1 and Q5 are cut off, the Q6 is conducted, the delay capacitor C3 discharges rapidly, the Uc rises rapidly to approach the power supply voltage Ue, and preparation is made for delay charging.
When the base voltage Ut of the synchronous switching tube Q1 reaches 0.7V, the switching tubes Q1 and Q5 are conducted, the Q6 is cut off, the time-delay capacitor C3 is charged through a diode D10, a control tube Q7, a resistor R7 and a power source Ue-Ue + loop, the Uc starts to descend, and the descending speed is mainly controlled by the control tube Q7.
When Uc drops to 1/3Ue, the output voltage Uz of the 555 chip 3 end rapidly jumps to high level, the trigger current Iz flows into the control electrodes of the silicon controlled rectifiers SCR1 and SCR2 through the capacitor C8, the resistors R5 and R6, the silicon controlled rectifiers in the positive working state are conducted, and the phase-controlled direct-current voltage Uo is charged.
When the charging current is smaller than the holding current of the controllable silicon, the controllable silicon is automatically closed.
When the base voltage Ut of the synchronous switch tube Q1 is lower than 0.7V again, the switch tubes Q1 and Q5 are cut off, the Q6 is conducted, the delay capacitor C3 discharges rapidly, and Uc rises rapidly to approach the power supply voltage Ue.
When Uc rises to 2/3Ue, the output voltage Uz of the 555 chip 3 end rapidly jumps to low level, and C8 discharges through the 555 chip 3 end, the 1 end, the ground, diodes D8 and D9, resistors R5 and R6 loop to recover the zero voltage state.
To this end, the 555 phase control flip flop completes one duty cycle.
The voltage stabilizing principle is as follows:
when the phase-controlled direct-current voltage Uo is reduced due to factors such as load increase or voltage reduction of an alternating-current power supply, the voltage of the cathode of the voltage stabilizing tube ZD1 is increased, the potential of the base of the trigger control tube Q7 is also increased, the control current is increased, the charging time of the delay capacitor C3 is shortened, the trigger delay angle is reduced, the trigger conduction angle is increased, the conduction average current of the phase-controlled silicon controlled rectifier is increased, and the phase-controlled direct-current voltage Uo is increased.
On the contrary, when the phase-controlled direct-current voltage Uo rises due to factors such as load lightening or voltage rise of an alternating-current power supply, the voltage level of the cathode of the voltage stabilizing tube ZD1 drops, the voltage level of the base of the trigger control tube Q7 also drops, the control current is reduced, the charging time of the delay capacitor C3 is prolonged, the trigger delay angle is increased, the trigger conduction angle is decreased, the conduction average current of the phase-controlled silicon controlled rectifier is reduced, the phase-controlled direct-current voltage Uo is made to fall back, and therefore the phase-controlled direct-current voltage is stabilized.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope and examples of the present invention.
It should be noted that the specific circuit structure, selection of components and connection relationship of the basic circuit of the present invention are only used as the preferred mode for explaining the principle, and a plurality of variations and modifications can be made without departing from the concept of the present invention, which belongs to the protection scope of the present invention.
Claims (5)
1. A time base phase control direct current stabilized voltage power supply is characterized in that: including trigger, phase-control silicon controlled rectifier, trigger synchronous switch, delay capacitor, trigger control circuit, phase-control synchronous signal source, trigger circuit power, its characterized in that: the trigger is a 555 time-base integrated circuit chip and is used for generating a trigger pulse signal for controlling the conduction of the phase-controlled silicon controlled rectifier;
the phase-controlled silicon controlled rectifier plays a role of a contactless switch, and the output end of the 555 time-base integrated circuit chip is connected with the control end of the phase-controlled silicon controlled rectifier through a capacitor and a resistor;
the trigger synchronous switch comprises an input tube and an output tube and is used for synchronizing the full-wave rectification voltage and the trigger pulse signal;
the input end of the 555 time-base integrated circuit chip is respectively connected with the output end of the output tube of the trigger synchronous switch and the trigger control tube; the trigger delay angle and the conduction angle are controlled by controlling the charging time of the delay capacitor so as to realize the control of the output voltage of the delay capacitor;
the phase control synchronous signal source provides synchronous signals for the synchronous switch;
the trigger circuit power supply provides stable working voltage for the trigger circuit.
2. The time-based phased dc regulated power supply of claim 1, wherein: the phase-control silicon controlled rectifiers comprise two phase-control silicon controlled rectifiers, cathodes of the two phase-control silicon controlled rectifiers are connected with the ground end of a 555 time-base integrated circuit chip and the anode of a phase-control direct-current power supply, the threshold end and the trigger end of the 555 time-base integrated circuit chip are divided into three paths after being connected, the first path is connected with the positive power source end of the 555 time-base integrated circuit chip through a delay capacitor, the second path is connected with the collector electrode of a trigger synchronous switch output tube, the emitting electrode of the trigger synchronous switch output tube is connected with the positive power source end of the 555 time-base integrated circuit chip, the third path is connected with the collector electrode of a trigger control tube through a crystal diode, and the emitting electrode of.
3. The time-based phased dc regulated power supply of claim 1, wherein: the output end of the 555 time-base integrated circuit chip is divided into two paths through a capacitor, and the two paths are respectively connected with the control electrode of the phase-control silicon controlled rectifier through a resistor to form a resistance-capacitance coupling trigger output loop.
4. The time-based phased dc regulated power supply of claim 1, wherein: the input tube of the trigger synchronous switch is connected with the full-bridge rectification output end of the trigger circuit power supply through a resistor.
5. The time-based phased dc regulated power supply of claim 1, wherein: the base of the input end of the trigger control tube is divided into two paths through a second resistor, one path is connected with the negative electrode of the phase-controlled direct-current power supply through a voltage stabilizing diode and a third resistor, and the other path is connected with the positive electrode of the trigger circuit power supply through a fourth resistor, so that the trigger control circuit with the functions of reference voltage sampling, phase-controlled direct-current voltage sampling, comparing and amplifying is formed.
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| CN201911213979.XA CN110806778B (en) | 2019-12-02 | 2019-12-02 | Time base phase control direct current voltage stabilizing power supply |
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| CN201911213979.XA CN110806778B (en) | 2019-12-02 | 2019-12-02 | Time base phase control direct current voltage stabilizing power supply |
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| CN110806778B true CN110806778B (en) | 2020-09-18 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2133941A (en) * | 1983-01-29 | 1984-08-01 | Stanley George Beszant | Switching circuit |
| CN100590956C (en) * | 2007-08-28 | 2010-02-17 | 冯筠荪 | Pressure regulating on-off circuit |
| CN201860308U (en) * | 2010-11-30 | 2011-06-08 | 苏州荣文库柏照明***有限公司 | Time-base integrated circuit |
| US10170937B2 (en) * | 2015-07-24 | 2019-01-01 | Qualcomm Incorporated | Devices, systems, and methods for adjusting output power using synchronous rectifier control |
| CN205490465U (en) * | 2016-02-05 | 2016-08-17 | 武汉大学 | 555 timer control's electric switch circuit |
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Effective date of registration: 20210330 Address after: No. 868, Songhua Road, Qingpu District, Shanghai City, Shanghai Patentee after: Shuxiang Mendi Group Co.,Ltd. Address before: 310002 No. 218 Nanshan Road, Shangcheng District, Zhejiang, Hangzhou Patentee before: CHINA ACADEMY OF ART |
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