CN112783254A - Auxiliary voltage source capable of automatically adjusting output and suitable for building safety - Google Patents
Auxiliary voltage source capable of automatically adjusting output and suitable for building safety Download PDFInfo
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- CN112783254A CN112783254A CN202011536088.0A CN202011536088A CN112783254A CN 112783254 A CN112783254 A CN 112783254A CN 202011536088 A CN202011536088 A CN 202011536088A CN 112783254 A CN112783254 A CN 112783254A
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Abstract
The invention discloses an auxiliary voltage source capable of automatically adjusting output and suitable for building safety, which comprises a power input circuit, a switching transformer, a control and drive circuit, a multi-path rectification output circuit, a photoelectric coupling circuit, an amplifier circuit and a triode circuit, wherein the power input circuit is connected with the switching transformer; based on the relationship between the temperature and the amplification factor of the triode, when the ambient temperature of the triode circuit changes, the amplification factor of the triode circuit increases/decreases along with the increase/decrease of the temperature, and the control and drive circuit automatically adjusts the working duty ratio of the input switching transformer according to the output current of the photoelectric coupling circuit, so that the purpose of controlling the voltage of the output side of the switching transformer is achieved.
Description
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to an auxiliary voltage source capable of automatically adjusting output and suitable for building safety.
Background
In a building site where an explosive gas, a flammable or combustible liquid vapor and air are mixed to form an explosive gas mixture, for safety, to prevent an electric contact arc from igniting the flammable gas to cause explosion, it is common to use high-safety-level electric equipment, instead of a contact-equipped regulated power supply, a contactless regulated power supply in which a full-cycle conducting bidirectional thyristor is used as a contactless device. The high-power contactless voltage-stabilized power supply needs an auxiliary power supply as the continuous trigger current for triggering and driving the control bidirectional thyristor, if a fixed voltage source is used for supplying power according to the conventional technology, the current capable of being effectively triggered is greatly influenced by the temperature, and the trigger current at-40 ℃ is about 4 times of that at-85 ℃, so that the phenomenon of over-triggering or under-triggering is easy to occur when the fixed voltage source is used for supplying power, and the performance or the reliability of the system can be influenced.
The above-mentioned methods do not have a technical idea of automatically adjusting a driving power supply according to a device of a semiconductor temperature characteristic, and include "a switching power supply circuit" disclosed in CN207625446U, "a switching power supply circuit" disclosed in CN207968310U, "a primary side controller and a switching power supply of a switching power supply" disclosed in CN108521115A, "and" a system and a method for constant current control using primary side sensing and adjustment "disclosed in CN 102769383B.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the phenomenon of over-triggering or under-triggering caused by adopting a fixed voltage source for power supply, the invention provides an auxiliary voltage source which is suitable for automatically adjusting output in building safety and automatically adjusts the current of a semiconductor element which has larger change along with temperature.
In order to achieve the purpose, the invention is realized by the following technical scheme: an auxiliary voltage source capable of automatically adjusting output and suitable for building safety comprises a power input circuit, a switching transformer, a control and drive circuit, a multi-path rectification output circuit, a photoelectric coupling circuit, an amplifier circuit and a triode circuit;
the output end of the power input circuit is connected with the input side of the switch transformer, the output side of the switch transformer is connected with the input end of the multi-path rectification output circuit, the multi-path rectification output power supply is divided into a first rectification output circuit and a second rectification output circuit, the output end of the first rectification output circuit is used as a trigger power supply of a high-power stabilized power supply, the output end of the second rectification output circuit is used as a power supply of a high-power stabilized power supply control circuit, the output end of the second rectification output circuit is respectively connected with the input end of the photoelectric coupling circuit and the input end of the amplifier circuit, the input end of the triode circuit is connected with the input end of the amplifier circuit, and the output end of the triode circuit is; the output end of the amplifier circuit is connected with the input end of a photoelectric coupling circuit, the output end of the photoelectric coupling circuit is connected with the input end of a control and drive circuit, and the output end of the control and drive circuit is connected with the input side of a switching transformer;
based on the relation between the temperature and the amplification factor of the triode, when the ambient temperature of the triode circuit changes, the amplification factor of the triode circuit increases/decreases along with the increase/decrease of the temperature, and the control and drive circuit automatically adjusts the working duty ratio of the input switching transformer according to the output current of the photoelectric coupling circuit, so that the purpose of controlling the voltage of the output side of the switching transformer along with the change of the ambient temperature is achieved.
Furthermore, the power input circuit comprises an input filter circuit and a rectification filter circuit, the output end of the input filter circuit is connected with the input end of the rectification filter circuit, and the output end of the rectification filter circuit is connected with the input side of the switch transformer.
Further, the second rectification output circuit comprises a first path of second rectification output circuit and a second path of second rectification output circuit;
the first path of second rectification output circuit comprises a positive voltage linear voltage stabilizer, and the output side voltage of the switching transformer is linearly stabilized by the positive voltage linear voltage stabilizer and then is used as a positive power supply of the high-power voltage-stabilized power supply control circuit;
the second path of second rectification output circuit comprises a negative voltage linear voltage stabilizer, and the output side voltage of the switching transformer is linearly stabilized by the negative voltage linear voltage stabilizer and then is used as a negative power supply of the high-power voltage-stabilized power supply control circuit.
Further, the amplifier circuit comprises an operational amplifier, the triode circuit comprises a triode, an emitting electrode of the triode is connected to the inverting input end of the operational amplifier, a collecting electrode of the triode is connected to the output end of the operational amplifier, and a base electrode of the triode is connected to the output end of the operational amplifier.
Further, the "control and drive circuit automatically adjusts the duty cycle of the input switching transformer according to the output current of the photoelectric coupling circuit" is specifically expressed as:
If＝Ic×CTR(1)
in the formula IfIs the input current of the photoelectric coupling circuit, IcIn order to control the input current of the driving circuit, CTR is the current transfer ratio of a photoelectric coupler in the photoelectric coupling circuit;
in the formula IcFor controlling the input current of the driving circuit, D is the duty cycle of the operation of the switching transformer, DmaxIs the maximum duty cycle at which the switching transformer operates.
The invention also discloses an output adjusting method of the auxiliary voltage source, which comprises the following steps:
the temperature change of the environment where the triode is positioned is sensed through the triode, and when the environment where the triode is positioned changes, the amplification factor of a triode circuit is increased/decreased along with the temperature increase/decrease;
the current output by the triode participates in adjusting the working duty ratio of the input switching transformer, so that the working duty ratio of the input switching transformer has double adjusting factors along with the input voltage and the ambient temperature;
when the working duty ratio of the input switching transformer has double adjustment factors with the input voltage and the ambient temperature, the voltage of the output side of the switching transformer changes along with the working duty ratio.
Has the advantages that: the invention is used as an auxiliary power supply for controlling and triggering a high-power voltage-stabilized power supply, is suitable for being used as a safety power supply in a building place where explosive gas, flammable or combustible liquid steam and air are mixed to form an explosive gas mixture, and has the following advantages compared with the prior art: (1) in the invention, a triode is used as a nonlinear device in a control feedback loop of a switching power supply to carry out temperature compensation and automatically adjust output voltage;
(2) the invention has the function of dual duty ratio change, when the environment temperature is not changed, even if the input voltage is changed, the output voltage can be stabilized at a certain value, which is similar to the common voltage-stabilized power supply; when the environmental temperature changes, the output voltage of the semiconductor device changes along with the temperature change, so that the driven contactless semiconductor device is in a better working state;
(3) the invention can effectively avoid the phenomenon that some abnormity of the contactless power supply can occur in the extreme temperature range of the working temperature range of the product;
(4) the invention can make the driven contactless semiconductor device in a better working state, reduce the heat productivity of the related element device at high temperature, and improve the driving capability of the related element device at low temperature, thereby improving the performance and reliability of the high-power voltage-stabilized power supply system.
Drawings
FIG. 1 is a block schematic of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment;
fig. 3 is a diagram showing the relationship between temperature and amplification factor of the triode.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Referring to fig. 1, the auxiliary voltage source for automatically adjusting output of the present invention includes an input filter circuit 1, a rectifying filter circuit 2, a switching transformer 3, a control and driving circuit 4, a first rectifying output circuit 5, a second rectifying output circuit 6, a photocoupler 7, an amplifier circuit 8 and a triode circuit 9;
an input power supply is sequentially sent to the input side of a switch transformer 3 through an input filter circuit 1 and a rectification filter circuit 2, a control and drive circuit 4 adjusts the duty ratio of a pulse signal input to the switch transformer 3, the switch transformer 3 is provided with a plurality of secondary windings, wherein one or more secondary windings are connected with a first rectification output circuit 5, one or more secondary windings are connected with a second rectification output circuit 6, the output voltage of the first rectification output circuit 5 is variable voltage and is used as a trigger power supply of a high-power stabilized power supply, and multiple paths of output for electrical isolation can be provided; the second rectification output circuit 6 is used as a control power supply of a high-power voltage-stabilized power supply, the output end of the second rectification output circuit 6 is respectively connected with the input end of a photoelectric coupler 7 and the input end of an amplifier circuit 8, a triode circuit 9 is connected into a feedback branch of the amplifier circuit 8, the output end of the amplifier circuit 8 is connected with the input end of the photoelectric coupler 7, the output end of the photoelectric coupler 7 is connected with the input end of a control and drive circuit 4, and the output end of the control and drive circuit 4 is connected with the input side of a switch transformer 3.
The technical solution of the present invention will be further described with reference to the circuit diagram of the auxiliary voltage source for automatically adjusting the output shown in fig. 2.
In fig. 2, CZ1 is a power input socket, inputting commercial power alternating current; the first resistor R1 is an NTC type thermistor and is used for limiting the impact current when the switching power supply is electrified; the first capacitor C1, the second capacitor C2, the third capacitor C3 and the first inductor L1 form an input filter circuit for inputting anti-interference filtering; the connection relation is as follows: the first resistor R1 is connected in series to the power L line loop, that is, one end of the first resistor R1 is connected to the 3 rd pin of the socket CZ1, the other end is connected to one common end of the first capacitor C1, the second capacitor C2 and the first inductor L1 input, the other end of the first capacitor C1 and the other common end of the third capacitor C3 and the first inductor L1 input are connected to the 2 nd pin of CZ1, and the other ends of the second capacitor C2 and the third capacitor C3 are connected to the 1 st pin of CZ 1.
The rectifier bridge BR1 and the fourth capacitor C4 form a rectifier filter circuit for rectifying and filtering; the connection relation is as follows: 2 terminals of the output of the first inductor L1 are respectively connected to 2 ac input terminals of a rectifier bridge BR1, a positive output terminal of the rectifier bridge BR1 is connected to the positive electrode of the fourth capacitor C4, and a negative output terminal of the rectifier bridge BR1 is connected to the negative electrode of the fourth capacitor C4.
The switching transformer T1, the first diode D1 and the second diode D2 constitute a switching transformer circuit, wherein the first diode D1 and the second diode D2 are used for limiting the peak value of the switching voltage; the connection relationship is: an anode of the first diode D1 and a 1 st pin of the switching transformer T1 are connected to an anode of the fourth capacitor C4, a cathode of the first diode D1 is connected to a cathode of the second diode D2, and an anode of the second diode D2 is connected to a 2 nd pin of the switching transformer T1.
The control and drive circuit comprises a control and drive chip U1 and a power supply circuit inside the control and drive chip U1, wherein the power supply circuit inside the control and drive chip U1 is composed of a seventh diode D7, a fifteenth capacitor C15, a fifth capacitor C5 and a second resistor R2; the connection relationship is: a pin D of the control and drive chip U1 is connected to an anode of the second diode D2 and a pin 2 of the switch transformer T1, a pin S of the control and drive chip U1 is connected to a cathode of the fourth capacitor C4, a cathode of the fifth capacitor C5 and a pin 3 of the switch transformer T1, and a pin C of the control and drive chip U1 is connected to an anode of the fifth capacitor C5 through a second resistor R2 in series; an anode of the seventh diode D7 is connected to the 4 th pin of the switching transformer T1, a cathode of the seventh diode D7 is connected to one pin of the fifteenth capacitor C15, and the other pin of the fifteenth capacitor C15 is connected to the S pin of the control and driving chip U1 and the 3 rd pin of the switching transformer T1.
A first path of first rectification output circuit is formed by a third diode D3, a sixth capacitor C6, a second inductor L2, a seventh capacitor C7, an eighth diode D8 and a third resistor R3, wherein the eighth diode D8 is used for indication, and the third resistor R3 is a current-limiting resistor; the connection relationship is: an anode of the third diode D3 is connected to a 12 th pin of the switching transformer T1, a cathode of the third diode D3 is connected to an anode of the sixth capacitor C6, one end of the second inductor L2, the other end of the second inductor L2 is connected to an output E2+ end of the first path of first rectification output circuit, an anode of the seventh capacitor C7, and one end of the third resistor R3, the other end of the third resistor R3 is connected to an anode of the eighth diode D8, a cathode of the sixth capacitor C6, a cathode of the seventh capacitor C7, and a cathode of the eighth diode D8 are connected to an 11 th pin of the switching transformer T1, which serve as an output E2-end of the first path of first rectification output circuit, and an output E2+ end and an output E2-end serve as trigger power supply terminals of the high-power stabilized power supply.
A fourth diode D4, an eighth capacitor C8, a third inductor L3, a ninth capacitor C9, a ninth diode D9 and a fourth resistor R4 form a second path of first rectification output circuit, wherein the ninth diode D9 is used as an indication, and the fourth resistor R4 is a current-limiting resistor; the connection relationship is: an anode of the fourth diode D4 is connected to the 10 th pin of the switching transformer T1, a cathode of the fourth diode D4 is connected to an anode of the eighth capacitor C8 and one end of the third inductor L3, the other end of the third inductor L3 is connected to the output E1+ end of the second path of first rectified output circuit, an anode of the ninth capacitor C9 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to an anode of the ninth diode D9, a cathode of the eighth capacitor C8, a cathode of the ninth capacitor C9 and a cathode of the ninth diode D9 are connected to the 9 th pin of the switching transformer T1, and serve as an output E1-end of the second path of first rectified output circuit.
A fifth diode D5, a tenth capacitor C10, a fourth inductor L4, an eleventh capacitor C11, a twelfth capacitor C12, a positive voltage linear voltage regulator U2, a twelfth polar tube D10 and a fifth resistor R5 form a first path of second rectification output circuit, the first path of second rectification output circuit is linearly regulated by a positive voltage linear voltage regulator U2 and then serves as a positive power supply of the high-power voltage-stabilized power supply control circuit, wherein the twelfth polar tube D10 serves as an indication, and the fifth resistor R5 serves as a current-limiting resistor; the connection relationship is: an anode of the fifth diode D5 is connected to the 8 th pin of the switching transformer T1, a cathode of the fifth diode D5 is connected to an anode of the tenth capacitor C10, one end of the fourth inductor L4, the other end of the fourth inductor L4 is connected to an anode of the eleventh capacitor C11, the 1 st pin of the positive voltage linear regulator U2, the 3 rd pin of the positive voltage linear regulator U2 is connected to the +5V of the first second rectified output and the anode of the twelfth capacitor C12, one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the anode of the twelfth diode D10, the cathode of the tenth capacitor C10, the cathode of the eleventh capacitor C11, the cathode of the twelfth capacitor C12, the cathode of the twelfth diode D10, the 2 nd pin of the positive voltage linear regulator U2 is connected to the 7 th pin of the switching transformer T1, and serves as the common terminal GND of the first second rectified output.
A sixth diode D6, a thirteenth capacitor C13, a fourteenth capacitor C14 and a negative voltage linear voltage regulator U3 form a second path of second rectification output circuit, and the second path of second rectification output circuit is linearly stabilized by the negative voltage linear voltage regulator U3 and then serves as a negative power supply of the high-power stabilized voltage supply control circuit; the connection relationship is: the cathode of the sixth diode D6 is connected to the 5 th pin of the switching transformer T1, the anode of the sixth diode D6 is connected to the cathode of the thirteenth capacitor C13 and the 2 nd pin of the negative voltage linear voltage regulator U3, the 3 rd pin of the negative voltage linear voltage regulator U3 is connected to the cathodes of the second path of second rectified output-5V and the fourteenth capacitor C14, the anode of the thirteenth capacitor C13, the anode of the fourteenth capacitor C14, and the 1 st pin of the negative voltage linear voltage regulator U3 are connected to the 6 th pin of the switching transformer T1, and serve as the common terminal GND of the second path of second rectified output; a 6 th pin of the switch transformer T1 is connected with a 7 th pin, and is electrically connected with a common end GND of the first path of second rectification output and a common end GND of the second path of second rectification output to be used as a common GND of a positive power supply and a negative power supply of the control circuit;
the photoelectric coupling circuit is composed of a photoelectric coupler U4, a sixth resistor R6 and a seventh resistor R7, wherein the sixth resistor R6 and the seventh resistor R7 are used for limiting the input current of the photoelectric coupler U4; the connection relationship is: the collector of the photocoupler U4 is connected to the cathode of the seventh diode D7, the emitter of the photocoupler U4 is connected to the C pin of the control and drive chip U1, the seventh resistor R7 is connected in parallel between the anode pin and the cathode pin of the light emitting diode in the photocoupler U4, and the anode of the light emitting diode in the photocoupler U4 is also connected to the cathode of the fifth diode D5 through the series connection of the sixth resistor R6.
The amplifier circuit is composed of an operational amplifier U5, a sixteenth capacitor C16, an eighth resistor R8, a ninth resistor R9, an eleventh diode D11, a triode V1, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, wherein the sixteenth capacitor C16 is a filter capacitor of the operational amplifier U5; the eighth resistor R8, the ninth resistor R9 and the eleventh diode D11 provide stable voltage for the non-inverting terminal of the operational amplifier U5, and the triode V1, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 form a negative feedback loop of the operational amplifier U5. The connection relationship is: a positive power supply input end of the operational amplifier U5 is connected to +5V, a negative power supply input end of the operational amplifier U5 is connected to GND, a sixteenth capacitor C16 is connected to a position close to the positive power supply input end and the negative power supply input end of the operational amplifier U5, one end of an eighth resistor R8 is connected to +5V, one end of a ninth resistor R9 is connected to a non-inverting input end of the operational amplifier U5, the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are connected to a cathode of an eleventh diode D11, and an anode of the eleventh diode D11 is connected to GND; one end of an eleventh resistor R11 and one end of a twelfth resistor R12 are connected to the inverting input terminal of the operational amplifier U5, and the other end of the twelfth resistor R12 is connected to GND; the other end of the eleventh resistor R11 is connected to the emitter of the triode V1, the tenth resistor R10 is connected in parallel between the collector and the base of the triode V1, and the collector of the triode V1 is also connected to the output end of the operational amplifier U5 and to the cathode of the photoelectric coupler U4.
The relationship between the temperature and the amplification factor of the triode is represented by a log-log coordinate diagram, and particularly referring to fig. 3, because the amplification factor of the triode V1 changes along with the change of the temperature, the invention uses the triode V1 as a nonlinear device in a feedback loop to carry out temperature compensation and automatically adjust the output voltage of the switching transformer. Namely: when the environment temperature of the triode V1 rises, the amplification factor of the triode V1 increases, the negative feedback of the operational amplifier U5 increases, the input current of the photoelectric coupler U4 increases, and the formula (1) is a mathematical expression between the photoelectric coupling and the control and drive module:
If＝Ic×CTR(1)
in the formula IfFor the current flowing into the light-emitting diode inside the photocoupler U4, IcCTR is the current transfer ratio of the photocoupler U4 for the current flowing into the C pin of the control and drive chip U1.
As can be seen from equation (1), the current flowing into the C pin of the control and driver chip U1 also increases.
Equation (2) is a mathematical expression between the control and drive module and the switching duty cycle:
in the formula IcThe current flowing into the pin C of the control and drive chip U1 ranges from 2 mA to 6 mA; d is the duty cycle of the operation of the switching transformer 3, DmaxIs the maximum duty cycle at which the switching transformer 3 operates.
As can be seen from equation (2), when the current flowing through the C pin of the control and drive chip U1 increases, the duty ratio of the pulse signal input to the switching transformer 3 decreases, and thus the voltage on the output side of the switching transformer 3 decreases. When the ambient temperature of the triode is reduced, the amplification factor of the triode V1 is reduced, the negative feedback of the operational amplifier U5 is weakened, the input current of the photoelectric coupler U4 is reduced, as can be known from the mathematical expression between the photoelectric coupling and the control and drive module in the formula (1), the current flowing into the C pin of the control and drive chip U1 is also reduced, and the mathematical expression between the control and drive module and the switching duty ratio in the formula (2) is utilized, when the current flowing into the C pin of the control and drive chip U1 is reduced, the duty ratio of the pulse signal input into the switching transformer 3 is increased, so that the voltage on the output side of the switching transformer 3 is increased, thereby realizing the purpose of automatically adjusting the output voltage, and being particularly suitable for driving and triggering a high-power stabilized voltage power supply of a high-power semiconductor element which.
The main component parameters mentioned above will now be explained: the first resistor R1 adopts NTC5D-9, the first capacitor C1 adopts 0.22K275V-X2, the first diode D1 adopts P6KE200, the second diode D2 adopts BYV26C, the D3-D6 adopt Schottky diodes, and the model is 11DQ 10; the control and drive chip U1 adopts TOP224Y, the positive voltage linear voltage stabilizer U2 adopts a positive voltage linear voltage stabilizer LM7805, the negative voltage linear voltage stabilizer U3 adopts a negative voltage linear voltage stabilizer LM7905, the photoelectric coupler U4 adopts PC817A, the operational amplifier U5 adopts TLV2252ID, and the triode V1 adopts a 2SC9014 triode.
Claims (6)
1. An auxiliary voltage source for automatically adjusting output suitable for building safety, characterized in that: the power supply comprises a power supply input circuit, a switching transformer, a control and drive circuit, a multi-path rectification output circuit, a photoelectric coupling circuit, an amplifier circuit and a triode circuit;
the output end of the power input circuit is connected with the input side of the switch transformer, the output side of the switch transformer is connected with the input end of the multi-path rectification output circuit, the multi-path rectification output power supply is divided into a first rectification output circuit and a second rectification output circuit, the output end of the first rectification output circuit is used as a trigger power supply of a high-power stabilized power supply, the output end of the second rectification output circuit is used as a power supply of a high-power stabilized power supply control circuit, the output end of the second rectification output circuit is respectively connected with the input end of the photoelectric coupling circuit and the input end of the amplifier circuit, the input end of the triode circuit is connected with the input end of the amplifier circuit, and the output end of the triode circuit is; the output end of the amplifier circuit is connected with the input end of a photoelectric coupling circuit, the output end of the photoelectric coupling circuit is connected with the input end of a control and drive circuit, and the output end of the control and drive circuit is connected with the input side of a switching transformer;
based on the relation between the temperature and the amplification factor of the triode, when the ambient temperature of the triode circuit changes, the amplification factor of the triode circuit increases/decreases along with the increase/decrease of the temperature, and the control and drive circuit automatically adjusts the working duty ratio of the input switching transformer according to the output current of the photoelectric coupling circuit, so that the purpose of controlling the voltage of the output side of the switching transformer along with the change of the ambient temperature is achieved.
2. An auxiliary voltage source for automatically adjusting output suitable for building safety as claimed in claim 1, wherein: the power input circuit comprises an input filter circuit and a rectification filter circuit, wherein the output end of the input filter circuit is connected with the input end of the rectification filter circuit, and the output end of the rectification filter circuit is connected with the input side of the switch transformer.
3. An auxiliary voltage source for automatically adjusting output suitable for building safety as claimed in claim 1, wherein: the second rectification output circuit comprises a first path of second rectification output circuit and a second path of second rectification output circuit;
the first path of second rectification output circuit comprises a positive voltage linear voltage stabilizer, and the output side voltage of the switching transformer is linearly stabilized by the positive voltage linear voltage stabilizer and then is used as a positive power supply of the high-power voltage-stabilized power supply control circuit;
the second path of second rectification output circuit comprises a negative voltage linear voltage stabilizer, and the output side voltage of the switching transformer is linearly stabilized by the negative voltage linear voltage stabilizer and then is used as a negative power supply of the high-power voltage-stabilized power supply control circuit.
4. An auxiliary voltage source for automatically adjusting output suitable for building safety as claimed in claim 1, wherein: the amplifier circuit comprises an operational amplifier, the triode circuit comprises a triode, an emitting electrode of the triode is connected to the inverting input end of the operational amplifier, a collecting electrode of the triode is connected to the output end of the operational amplifier, and a base electrode of the triode is connected to the output end of the operational amplifier.
5. An auxiliary voltage source for automatically adjusting output suitable for building safety as claimed in claim 1, wherein: the control and drive circuit automatically adjusts the working duty ratio of the input switching transformer according to the output current of the photoelectric coupling circuit, which is specifically expressed as follows:
If＝Ic×CTR (1)
in the formula IfIs the input current of the photoelectric coupling circuit, IcIn order to control the input current of the driving circuit, CTR is the current transfer ratio of a photoelectric coupler in the photoelectric coupling circuit;
in the formula IcFor controlling the input current of the driving circuit, D is the duty cycle of the operation of the switching transformer, DmaxIs the maximum duty cycle at which the switching transformer operates.
6. The method for adjusting the output of an auxiliary voltage source suitable for an automatically adjusted output of building safety as claimed in any one of claims 1 to 5, wherein: the method comprises the following steps:
the temperature change of the environment where the triode is positioned is sensed through the triode, and when the environment where the triode is positioned changes, the amplification factor of a triode circuit is increased/decreased along with the temperature increase/decrease;
the current output by the triode participates in adjusting the working duty ratio of the input switching transformer, so that the working duty ratio of the input switching transformer has double adjusting factors along with the input voltage and the ambient temperature;
when the working duty ratio of the input switching transformer has double adjustment factors with the input voltage and the ambient temperature, the voltage of the output side of the switching transformer changes along with the working duty ratio.
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Application publication date: 20210511 |