CN107863750A - A kind of double protection power source circuits of soft start - Google Patents

A kind of double protection power source circuits of soft start Download PDF

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Publication number
CN107863750A
CN107863750A CN201711310115.0A CN201711310115A CN107863750A CN 107863750 A CN107863750 A CN 107863750A CN 201711310115 A CN201711310115 A CN 201711310115A CN 107863750 A CN107863750 A CN 107863750A
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CN
China
Prior art keywords
triode
poles
resistance
pole
colelctor electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711310115.0A
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Chinese (zh)
Inventor
王前明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan New Technology Co Ltd For Flooding
Original Assignee
Sichuan New Technology Co Ltd For Flooding
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Application filed by Sichuan New Technology Co Ltd For Flooding filed Critical Sichuan New Technology Co Ltd For Flooding
Priority to CN201711310115.0A priority Critical patent/CN107863750A/en
Publication of CN107863750A publication Critical patent/CN107863750A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a kind of double protection power source circuits of soft start; include the transformer T1 of input termination 220V alternating currents; the diode bridge rectifier D1 being connected with input with transformer T1 output end; the overvoltage crowbar being connected with diode bridge rectification D1; the soft starting circuit being connected with overvoltage crowbar, and the current foldback circuit being connected with soft starting circuit.The present invention provides a kind of soft start double protection power source circuits; raising that can be progressively in power supply is to the powering quantity of electrical appliance; the impact that power supply is powered to electrical appliance when not only reducing startup well; the impact that each component is subject to inside circuit is also reduced well, has reached protection circuit and the effect of electrical appliance well.

Description

A kind of double protection power source circuits of soft start
Technical field
The present invention relates to electronic applications, in particular to a kind of double protection power source circuits of soft start.
Background technology
Impact during power initiation to electrical appliance is larger, is unfavorable for protecting electrical appliance, while also can be to each of power supply circuit Individual component causes larger load.The major way that now suppresses the rush of current of this moment is to set surge protection electricity Road, which are that directly the electric current for entering input capacitance is limited by Surge suppression, its requirement to each component Larger, the service life of component when in use is also shorter, it is easy to is damaged under the impact of electric current.In order to improve component Service life, and protection of the power circuit to electrical equipment, how to design a preferably power circuit also progressively becomes The research core of enterprise.
The content of the invention
It is an object of the invention to overcome above mentioned problem, there is provided a kind of double protection power source circuits of soft start, the energy in power supply Enough raisings progressively are to the powering quantity of electrical appliance, the impact that power supply is powered to electrical appliance when not only reducing startup well, The impact that each component is subject to inside circuit is also reduced well, has reached protection circuit and the effect of electrical appliance well.
The purpose of the present invention is achieved through the following technical solutions：
A kind of double protection power source circuits of soft start, include the transformer T1 of input termination 220V alternating currents, it is equal with input The diode bridge rectifier D1 being connected with transformer T1 output end, the overvoltage guarantor being connected with diode bridge rectification D1 Protection circuit, the soft starting circuit being connected with overvoltage crowbar, and the current foldback circuit being connected with soft starting circuit.
Further, the overvoltage crowbar is by unidirectional thyristor Q5, and positive pole is through fuse F1, negative pole and unidirectional brilliant lock Polar capacitor C2, the P pole that pipe Q5 N poles are connected is connected with unidirectional thyristor Q5 control pole, N poles after resistance R7 with list The voltage-regulator diode D3 being connected to IGCT Q5 P poles, and one end is connected with voltage-regulator diode D3 N poles, the other end The resistance R12 compositions being connected with unidirectional thyristor Q5 N poles；Wherein, polar capacitor C2 positive pole and diode bridge rectification Device D1 positive output end is connected, and polar capacitor C2 negative pole is connected with diode bridge rectifier D1 negative output terminals.
Further, the soft starting circuit is by triode Q1, triode Q4, triode Q9, triode Q6, triode Q7, the pole that positive pole is connected after diode D4 with triode Q1 emitter stage, negative pole is connected with triode Q9 emitter stage Property electric capacity C3, the resistance R1 being serially connected between triode Q1 emitter and collector, one end is connected with triode Q4 base stage Connect, the resistance R11 that the other end is connected with triode Q9 colelctor electrode, one end is connected with triode Q1 colelctor electrode, is another Electric capacity C1, the P pole that is connected with triode Q6 base stage is held to be connected with triode Q6 base stage, N poles and triode Q6 hair The diode D5 that emitter-base bandgap grading is connected, one end is connected with triode Q6 colelctor electrode, the other end and triode Q7 colelctor electrode phase The resistance R8 of connection, the electricity that one end is connected with triode Q1 colelctor electrode, the other end is connected with triode Q7 emitter stage Hinder R3, the voltage-regulator diode D6 that P poles are connected with triode Q7 emitter stage, N poles are connected with diode D5 N poles, one end It is connected after resistance R4 with triode Q1 colelctor electrode, the other end is extremely connected after resistance R13 with voltage-regulator diode D6 N Connect, the variable resistor R9 that sliding end is connected with triode Q7 base stage, and positive pole be connected with triode Q1 colelctor electrode, The polar capacitor C4 compositions that negative pole is connected with voltage-regulator diode D6 N poles；Wherein, triode Q1 base stage is with triode Q4's Emitter stage is connected, and triode Q1 colelctor electrode is connected with triode Q4 colelctor electrode, diode D4 P poles while and polarity Electric capacity C3 positive pole is connected with unidirectional thyristor Q5 P poles, and polar capacitor C3 is connected with unidirectional thyristor Q5 N poles, and three Pole pipe Q9 emitter stage is connected and is grounded with triode Q6 emitter stage, triode Q9 base stage and triode Q6 colelctor electrode It is connected.
Further, the current foldback circuit is by multiple tube Q2, unidirectional thyristor Q8, triode Q3, N pole with it is compound The light emitting diode D2 that pipe Q2 base stage is connected, P poles are connected after resistance R5 with multiple tube Q2 colelctor electrode, one end and hair The electric capacity C5 that optical diode D2 P poles are connected, the other end is connected with unidirectional thyristor Q8 N poles, is serially connected in triode Q3 Emitter stage and base stage between resistance R2, one end is connected with triode Q3 colelctor electrode, the other end and unidirectional thyristor Q8 The resistance R10 that is connected of control pole, and one end is connected with unidirectional thyristor Q8 control pole, the other end and unidirectional brilliant lock The resistance R14 compositions that pipe Q8 N poles are connected；Wherein, multiple tube Q2 base stage is connected with unidirectional thyristor Q8 P poles, multiple The emitter stage for closing pipe Q2 is connected with triode Q3 emitter stage, and multiple tube Q2 colelctor electrode is connected with polar capacitor C4 positive pole Connect, unidirectional thyristor Q8 N poles are connected with polar capacitor C4 negative pole, triode Q3 base stage and unidirectional thyristor Q8 N Pole forms the power output end of the current foldback circuit.
The present invention compared with prior art, has advantages below and beneficial effect：
(1) overvoltage crowbar of the invention can timely blow fuse in circuit overvoltage, after reaching protection The purpose of continuous circuit, the security and stability of circuit operation are greatly improved, to follow-up first device when reducing overtension The damage of part, and then reduce the O＆M cost of circuit.
(2) present invention is provided with soft starting circuit, and the power supply to follow-up electrical appliance can be progressively increased after normal power supply Amount, has reached the purpose of the follow-up electrical appliance of protection, has reduced impact of the transient current to electrical appliance and circuit components, greatly The service life for improving circuit.
(3) present invention is provided with current foldback circuit, and power supply timely can be voluntarily cut off in supply current excessively stream, is entered One step protects the safety in utilization of follow-up electrical appliance.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the present invention.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment
As shown in figure 1, a kind of double protection power source circuits of soft start, include the transformer T1 that input terminates 220V alternating currents, The diode bridge rectifier D1 being connected with input with transformer T1 output end, it is connected with diode bridge rectification D1 The overvoltage crowbar connect, the soft starting circuit being connected with overvoltage crowbar, and the mistake being connected with soft starting circuit Flow protection circuit.
The overvoltage crowbar is by unidirectional thyristor Q5, fuse F1, polar capacitor C2, voltage-regulator diode D3, resistance R7, and resistance R12.
During connection, polar capacitor C2 positive pole is connected through fuse F1, negative pole with unidirectional thyristor Q5 N poles, voltage stabilizing Diode D3 P poles are connected with unidirectional thyristor Q5 control pole, P pole phase of the N poles after resistance R7 with unidirectional thyristor Q5 Connection, resistance R12 one end is connected with voltage-regulator diode D3 N poles, the other end is connected with unidirectional thyristor Q5 N poles.
Wherein, polar capacitor C2 positive pole is connected with diode bridge rectifier D1 positive output end, polar capacitor C2 Negative pole be connected with diode bridge rectifier D1 negative output terminals.
When the output voltage is too high, the voltage after resistance R7 and resistance R12 partial pressures also increases, and voltage-regulator diode D3 is breakdown Short circuit, and then trigger unidirectional thyristor Q5 conducting, so that short-circuit output voltage burns out fuse with up to the mesh of protection rear class 's.
The soft starting circuit is by triode Q1, triode Q4, triode Q9, triode Q6, triode Q7, diode D4, diode D5, voltage-regulator diode D6, polar capacitor C3, electric capacity C1, acute electric capacity C4, resistance R11, resistance R8, resistance R1, Resistance R3, resistance R4, resistance R13, and variable resistor R9.
During connection, polar capacitor C3 positive pole is connected after diode D4 with triode Q1 emitter stage, negative pole and three Pole pipe Q9 emitter stage is connected, and resistance R1 is serially connected between triode Q1 emitter and collector, resistance R11 one end with Triode Q4 base stage is connected, the other end is connected with triode Q9 colelctor electrode, and electric capacity C1 one end is with triode Q1's Colelctor electrode is connected, the other end is connected with triode Q6 base stage, and diode D5 P poles are connected with triode Q6 base stage Connect, N poles are connected with triode Q6 emitter stage, resistance R8 one end is connected with triode Q6 colelctor electrode, the other end with Triode Q7 colelctor electrode is connected, and resistance R3 one end is connected with triode Q1 colelctor electrode, the other end and triode Q7 Emitter stage be connected, voltage-regulator diode D6 P poles are connected with triode Q7 emitter stage, N poles and diode D5 N poles phase Connection, variable resistor R9 one end is connected after resistance R4 with triode Q1 colelctor electrode, the other end after resistance R13 with it is steady Pressure diode D6 N poles are connected, sliding end is connected with triode Q7 base stage, polar capacitor C4 positive pole and triode Q1 Colelctor electrode be connected, negative pole is connected with voltage-regulator diode D6 N poles.
Wherein, triode Q1 base stage is connected with triode Q4 emitter stage, triode Q1 colelctor electrode and triode Q4 colelctor electrode is connected, and diode D4 P poles are extremely connected with polar capacitor C3 positive pole and unidirectional thyristor Q5 P simultaneously Connect, polar capacitor C3 is connected with unidirectional thyristor Q5 N poles, and triode Q9 emitter stage is connected with triode Q6 emitter stage Connect and be grounded, triode Q9 base stage is connected with triode Q6 colelctor electrode.
By resistance R1 and electric capacity C1 values, soft start delay time can obtain.When energized, circuit passes through resistance R1 and two Pole pipe D5 charges to electric capacity C1, charge constant t=R*C, when fully charged so that and triode Q6 is turned on, so that Triode Q9 is turned on, and finally causes triode Q1 and triode Q4 conductings, so as to reach the purpose of soft start.
The current foldback circuit is by multiple tube Q2, unidirectional thyristor Q8, triode Q3, electric capacity C5, resistance R5, resistance R2, resistance R10, resistance R14, and light emitting diode D2.
During connection, light emitting diode D2 N poles are connected with multiple tube Q2 base stage, P poles after resistance R5 with multiple tube Q2 colelctor electrode is connected, and electric capacity C5 one end is connected with light emitting diode D2 P poles, the other end and unidirectional thyristor Q8 N poles are connected, and resistance R2 is serially connected between triode Q3 emitter stage and base stage, resistance R10 one end and triode Q3 collection Electrode is connected, the other end is connected with unidirectional thyristor Q8 control pole, resistance R14 one end and unidirectional thyristor Q8 control Pole processed is connected, the other end is connected with unidirectional thyristor Q8 N poles.
Wherein, multiple tube Q2 base stage is connected with unidirectional thyristor Q8 P poles, multiple tube Q2 emitter stage and triode Q3 emitter stage is connected, and multiple tube Q2 colelctor electrode is connected with polar capacitor C4 positive pole, unidirectional thyristor Q8 N poles with Polar capacitor C4 negative pole is connected, and triode Q3 base stage forms the current foldback circuit with unidirectional thyristor Q8 N poles Power output end.
It when output current excessively stream, will be increased by detection resistance R2 electric current, and then cause triode Q3 conductings, so as to Unidirectional thyristor Q8 conducting is triggered, and Q2 is worked in cut-off state so that circuit blocks to rear power supply, to reach open circuit Protect the purpose of successive load.
As described above, the present invention can be realized well.

Claims (4)

  1. A kind of 1. double protection power source circuits of soft start, it is characterised in that：Include the transformer T1 of input termination 220V alternating currents, with The diode bridge rectifier D1 that input is connected with transformer T1 output end, it is connected with diode bridge rectification D1 Overvoltage crowbar, the soft starting circuit being connected with overvoltage crowbar, and the excessively stream being connected with soft starting circuit Protection circuit.
  2. A kind of 2. double protection power source circuits of soft start according to claim 1, it is characterised in that：The overvoltage crowbar By unidirectional thyristor Q5, polar capacitor C2, P pole that positive pole is connected through fuse F1, negative pole with unidirectional thyristor Q5 N poles with The voltage-regulator diode that unidirectional thyristor Q5 control pole is connected, N poles are connected after resistance R7 with unidirectional thyristor Q5 P poles D3, and the resistance R12 that one end is connected with voltage-regulator diode D3 N poles, the other end is connected with unidirectional thyristor Q5 N poles Composition；Wherein, polar capacitor C2 positive pole is connected with diode bridge rectifier D1 positive output end, and polar capacitor C2's is negative Pole is connected with diode bridge rectifier D1 negative output terminals.
  3. A kind of 3. double protection power source circuits of soft start according to claim 2, it is characterised in that：The soft starting circuit by Triode Q1, triode Q4, triode Q9, triode Q6, triode Q7, transmitting of the positive pole after diode D4 with triode Q1 The polar capacitor C3 that pole is connected, negative pole is connected with triode Q9 emitter stage, it is serially connected in triode Q1 emitter stage and collection Resistance R1 between electrode, one end is connected with triode Q4 base stage, the other end is connected with triode Q9 colelctor electrode Resistance R11, electric capacity C1, the P poles that one end is connected with triode Q1 colelctor electrode, the other end is connected with triode Q6 base stage It is connected with triode Q6 base stage, the diode D5 that N poles are connected with triode Q6 emitter stage, one end is with triode Q6's The resistance R8 that colelctor electrode is connected, the other end is connected with triode Q7 colelctor electrode, one end and triode Q1 colelctor electrode phase Connection, resistance R3, the P pole that is connected with triode Q7 emitter stage of the other end are connected with triode Q7 emitter stage, N poles and The voltage-regulator diode D6 that diode D5 N poles are connected, one end are connected with triode Q1 colelctor electrode after resistance R4, are another End is connected after resistance R13 with voltage-regulator diode D6 N poles, the variable resistor that sliding end is connected with triode Q7 base stage R9, and the polar capacitor C4 that positive pole is connected with triode Q1 colelctor electrode, negative pole is connected with voltage-regulator diode D6 N poles Composition；Wherein, triode Q1 base stage is connected with triode Q4 emitter stage, and triode Q1 colelctor electrode is with triode Q4's Colelctor electrode is connected, and diode D4 P poles are connected with polar capacitor C3 positive pole and unidirectional thyristor Q5 P poles simultaneously, pole Property electric capacity C3 is connected with unidirectional thyristor Q5 N poles, triode Q9 emitter stage be connected with triode Q6 emitter stage and Ground connection, triode Q9 base stage are connected with triode Q6 colelctor electrode.
  4. A kind of 4. double protection power source circuits of soft start according to claim 3, it is characterised in that：The current foldback circuit By multiple tube Q2, unidirectional thyristor Q8, triode Q3, N pole is connected with multiple tube Q2 base stage, P poles are after resistance R5 and multiple Close the light emitting diode D2 that pipe Q2 colelctor electrode is connected, one end is connected with light emitting diode D2 P poles, the other end with unidirectionally The electric capacity C5 that IGCT Q8 N poles are connected, the resistance R2 being serially connected between triode Q3 emitter stage and base stage, one end and three The resistance R10 that pole pipe Q3 colelctor electrode is connected, the other end is connected with unidirectional thyristor Q8 control pole, and one end and list It is connected to IGCT Q8 control pole, the resistance R14 compositions that the other end is connected with unidirectional thyristor Q8 N poles；Wherein, it is multiple The base stage for closing pipe Q2 is connected with unidirectional thyristor Q8 P poles, and multiple tube Q2 emitter stage is connected with triode Q3 emitter stage Connect, multiple tube Q2 colelctor electrode is connected with polar capacitor C4 positive pole, unidirectional thyristor Q8 N poles and bearing for polar capacitor C4 Pole is connected, and triode Q3 base stage forms the power output end of the current foldback circuit with unidirectional thyristor Q8 N poles.
CN201711310115.0A 2017-12-11 2017-12-11 A kind of double protection power source circuits of soft start Pending CN107863750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711310115.0A CN107863750A (en) 2017-12-11 2017-12-11 A kind of double protection power source circuits of soft start

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711310115.0A CN107863750A (en) 2017-12-11 2017-12-11 A kind of double protection power source circuits of soft start

Publications (1)

Publication Number Publication Date
CN107863750A true CN107863750A (en) 2018-03-30

Family

ID=61705615

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711310115.0A Pending CN107863750A (en) 2017-12-11 2017-12-11 A kind of double protection power source circuits of soft start

Country Status (1)

Country Link
CN (1) CN107863750A (en)

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Application publication date: 20180330